CN217891314U - Core mould and mould for producing hollow prefabricated part - Google Patents

Abstract

The utility model discloses a mandrel for producing hollow prefabricated component, surround the rigid movable mould board that the mechanism of breathing out and arrange including at least one breathing out mechanism and two above circumference, wherein, the rigid movable mould board is drawn close and/or is kept away from each other by the mechanism drive that breathes out and breathes out more than two, and two adjacent rigid movable mould boards are sealed linking up by flexible template, thereby the rigid movable mould board is kept away from each other and is occupied great space, after producing the hollow portion, the rigid movable mould board draws close each other, realizes rigid movable mould board and prefabricated component inner wall phase separation, the mandrel is convenient for take out more. And the end part of the rigid movable template in the circumferential surrounding direction is provided with a blunt edge surface which can abut against the flexible template, and the rigid movable template and the flexible template have larger contact areas, so that the service life of the core mold is prolonged, and the product quality of the produced hollow prefabricated part is improved. The utility model also discloses a mould, including above-mentioned mandrel, still include the external mold, the mandrel install in the die cavity of external mold.

Description

Core mould and mould for producing hollow prefabricated part

Technical Field

The utility model relates to a prefabricated component production technical field especially relates to a mandrel and mould for producing hollow prefabricated component.

Background

The prefabricated member refers to a steel, wood or concrete member previously manufactured in a factory or on the site according to design specifications. The prefabricated part has the advantages of good structural performance, high construction speed and the like, and the hollow prefabricated part also has the advantages of low production cost, convenience in transportation and the like on the basis of the advantages.

In the prior art, a core mold is usually set in a mold in advance for producing a hollow prefabricated member, and the core mold is drawn out after the hollow prefabricated member is formed, so that the space occupied by the core mold originally forms a hollow part of the hollow prefabricated member. The core mould generally comprises an inner rigid mould and an outer flexible mould, the flexible mould is expanded or contracted along with the rigid mould, the flexible mould occupies a larger space along with the expansion of the rigid mould when the hollow prefabricated part is manufactured, the flexible mould is contracted along with the contraction of the rigid mould when the hollow prefabricated part is manufactured and the core mould needs to be taken out, and the core mould is separated from the inner wall of the hollow prefabricated part at the moment, so that the flexible mould is convenient to take out. The problem in the prior art is that the rigid mold often punctures the flexible mold when expanding, so that the core mold cannot be reused.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the problem that the rigid mould often punctures the flexible mould when strutting.

For realizing the purpose of the utility model, the utility model adopts the following technical scheme:

the utility model provides a mandrel for producing hollow prefabricated component, includes at least one breathing mechanism and two above circumference rigid movable mould boards that the breathing mechanism arranged around, wherein, two above rigid movable mould boards are drawn close and/or keep away from each other by breathing mechanism drive, and two adjacent rigid movable mould boards are sealed by flexible template and link up, and rigid movable mould board is formed with the blunt arris face that can offset with flexible template at the ascending tip of circumference surrounding direction.

Further, in the core mold for producing a hollow prefabricated member as described above, there are also the following features: the blunt edge surface and the flexible template are in surface contact or line contact;

and/or the blunt edge surface is abutted against the stop surface of the flexible template, and the blunt edge surface and the stop surface comprise one or more of an inclined surface, a plane, a spherical surface and a curved surface.

Further, in the core mold for producing a hollow prefabricated member as described above, there are also the following features: the flexible template is at least partially made of elastic materials;

or a connecting section is arranged between the positions where the flexible template is connected with the two adjacent rigid movable templates, and at least part of the connecting section is made of elastic materials;

and/or the outer contour line of the cross section of the core mould gradually decreases from one end to the other end in the length direction.

Further, the core mold for producing a hollow prefabricated member described above has the following features: the rigid movable template is connected with the flexible template through one or more modes of a fastener, clamping, bonding and magnetic attraction;

and/or the flexible template is arranged on the outer side of the rigid movable template;

and/or the flexible template is annular or strip-shaped;

and/or, the collapsing mechanism comprises a hollow balloon that is radially expandable and contractible;

and/or the expansion and contraction mechanism comprises an expansion piece with a telescopic function, at least one end of the expansion piece is connected with the inner side of the rigid movable template, and the expansion and contraction mechanism can drive the rigid movable template (2) to move along the central axis of the core mold.

Further, the core mold for producing a hollow prefabricated member described above has the following features: the expansion mechanism comprises at least one movable mandrel, and the movable mandrel is connected with the rigid movable template through a plurality of hinge assemblies arranged at intervals along the length direction of the movable mandrel.

Further, the core mold for producing a hollow prefabricated member described above has the following features: at least one of the rigid movable template and the movable mandrel can slide relative to the sliding hinge assembly for a preset distance along the length direction of the movable mandrel;

the sliding hinge assembly comprises at least one lug seat connected with the rigid movable template and at least one lug seat connected with the movable mandrel, and at least one of the lug seat connected with the rigid movable template and the lug seat connected with the movable mandrel is provided with a kidney-shaped hole extending for a preset distance along the length direction of the movable mandrel.

Further, the core mold for producing a hollow prefabricated member described above has the following features: the expanding and contracting mechanism further comprises a push-pull assembly, the push-pull assembly comprises a rotating rod, the end part of at least one movable mandrel positioned at the end part of the mandrel is in threaded connection with the rotating rod, the rotating rod is in limited connection with the bearing mounting plate along the length direction of the movable mandrel, and the rotating rod can rotate so as to drive the movable mandrel to reciprocate along the length direction of the movable mandrel.

Further, the core mold for producing a hollow prefabricated member described above has the following features: the expansion and contraction mechanism comprises at least two movable mandrels, axial splicing parts are arranged at one end or two ends of each movable mandrel in the length direction, and the two adjacent movable mandrels are tightly connected through the axial splicing parts.

Further, the core mold for producing a hollow prefabricated member described above has the following features: the axial splicing part comprises a male splicing part and a female splicing part matched with the male splicing part, the male splicing part is arranged at the end part of one of the two adjacent movable mandrels, the female splicing part is arranged at the end part of the other one of the two adjacent movable mandrels, and the male head of the male splicing part and the female groove of the female splicing part form tensile fit in the direction away from each other;

and/or at least one positioning plate with a part protruding is arranged on the inner side of the end part of the rigid movable template, and two adjacent movable mandrels are aligned axially through the positioning plate when spliced.

The utility model also provides the following technical scheme:

the mold comprises the core mold for producing the hollow prefabricated part and an outer mold, wherein the core mold is arranged in a mold cavity of the outer mold.

The utility model provides a mandrel for producing hollow prefabricated component has following technological effect:

the core mould comprises at least one expansion mechanism and more than two rigid movable mould plates which are circumferentially arranged around the expansion mechanism, wherein the more than two rigid movable mould plates are driven by the expansion mechanism to mutually approach and/or keep away from each other, and the adjacent two rigid movable mould plates are connected by the flexible mould plates in a sealing manner. And, the tip of rigidity movable mould board in the circumference direction of encircleing is formed with the blunt faceted pebble that can offset with flexible template, therefore, when more than two rigidity movable mould boards draw close each other and keep away from, rigidity movable mould board and flexible template all have great area of contact, avoid local pressure too big to lead to the flexible template impaired to improve the life of mandrel, and, ensure that hollow prefabricated component can produce as required, can improve the product quality of hollow prefabricated component who produces.

The utility model also provides a mould, owing to contain aforementioned a core mould for producing hollow prefabricated component, consequently have with the technological effect of aforementioned core mould.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive labor.

Fig. 1 is a schematic structural view of a core mold according to an embodiment of the present invention;

FIG. 2 is an enlarged view of a portion A of FIG. 1;

fig. 3 is a schematic structural diagram of an expansion and contraction mechanism in an embodiment of the present invention;

FIG. 4 is a schematic structural view of the hinge assembly of FIG. 3;

FIG. 5 is a cross-sectional view of the hinge assembly of FIG. 4;

fig. 6 is a schematic structural view of an inner side of a rigid movable template in an embodiment of the present invention;

figure 7 is a schematic structural view of a push-pull assembly according to an embodiment of the present invention;

FIG. 8 is a cross-sectional view of the push-pull assembly of FIG. 7;

fig. 9 is a schematic structural view of another core mold according to an embodiment of the present invention;

fig. 10 is a schematic view of the inner structure of the core mold of fig. 9;

fig. 11 is a partial enlarged view of a portion B in fig. 10;

fig. 12 is a partially enlarged view of a portion C in fig. 10;

fig. 13 is a schematic end view of another mandrel in an embodiment of the present invention;

fig. 14 is a schematic end view of a further mandrel according to an embodiment of the present invention;

fig. 15 is a schematic view showing an internal structure of another core mold according to the embodiment of the present invention;

fig. 16 is a schematic view showing an internal structure of a core mold according to another embodiment of the present invention;

fig. 17 is a schematic structural view of a mold in an embodiment of the present invention;

fig. 18 is a cross-sectional view of the embodiment of the present invention after the butt joint of the male splice and the female splice.

In the drawings:

1. an expansion and contraction mechanism; 11. a movable mandrel; 111. a male splice; 1111. a male head; 112. a female splice; 1121. a mother tank; 12. a hinge assembly; 121. an ear mount; 122. a support plate; 123. a pin shaft; 124. a lock pin; 125. a kidney-shaped hole; 13. a push-pull assembly; 131. rotating the rod; 132. a rolling bearing; 133. a bearing mounting plate; 134. a limiting bulge; 135. a bearing seat; 136. a bearing cap; 137. a connecting bolt; 138. a push-pull pin rod; 139. a support bar; 2. a rigid movable template; 21. a blunt facet; 22. positioning a plate; 23. mounting holes; 24. a cover plate; 25. reinforcing ribs; 26. a connecting plate; 27. sealing gaskets; 28. a screw; 3. a flexible template; 31. a stop surface; 32. a joining section; 4. an outer mold; 5. an air bag; 6. a telescopic member.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention.

< example one >

Please refer to fig. 1 and fig. 2, the utility model provides a mandrel for producing hollow prefabricated component, including at least an expending mechanism 1 and two above circumference around the rigid movable mould board 2 that the expending mechanism 1 arranged, wherein, two above rigid movable mould boards 2 are driven by the expending mechanism 1 and are drawn close and/or keep away from each other, and two adjacent rigid movable mould boards 2 are sealed by flexible template 3 and link up, when producing hollow prefabricated component, thereby two above rigid movable mould boards 2 are driven by the expending mechanism 1 earlier and are kept away from each other and occupy great space, thereby produce the hollow portion of hollow prefabricated component, treat the preparation of hollow prefabricated component and accomplish the back, two above rigid movable mould boards 2 are driven by the expending mechanism 1 and are drawn close each other, thereby realize rigid movable mould board 2 and prefabricated component inner wall phase separation, the mandrel is whole to be convenient for take out in the hollow portion of hollow prefabricated component more. Moreover, the end part of the rigid movable template 2 in the circumferential surrounding direction is provided with the blunt edge surface 21 which can abut against the flexible template 3, so that when more than two rigid movable templates 2 are close to and far away from each other, the rigid movable template 2 and the flexible template 3 have larger contact areas, the flexible template 3 is prevented from being damaged due to overlarge local pressure, the service life of the core mould is prolonged, the hollow prefabricated component can be produced as required, and the product quality of the produced hollow prefabricated component can be improved.

As a preferred technical solution, referring to fig. 1 and fig. 2, the core mold provided in this embodiment includes an expansion mechanism 1 and four rigid movable mold plates 2, and the four rigid movable mold plates 2 surround the expansion mechanism 1, and it can be understood that the specific number of the expansion mechanism 1 and the rigid movable mold plates 2 may be determined according to actual situations. Referring to fig. 1 and 2, the rigid movable mold plate 2 and the flexible mold plate 3 of the present embodiment substantially enclose a core mold with a rectangular cross-sectional outer contour, at which the hollow portion of the hollow prefabricated component manufactured by the core mold is substantially rectangular, and the number, shape and arrangement of the rigid movable mold plate 2 and the flexible mold plate 3 may be adjusted adaptively, for example, the rigid movable mold plate 2 and the flexible mold plate 3 are formed with a substantially circular, hexagonal or other cross-sectional outer contour, so as to produce the hollow prefabricated component with the hollow portion having a corresponding shape

< example II >

In the present embodiment, the same portions as those in the first embodiment are given the same reference numerals, and the same description is omitted.

The core mold for producing a hollow preform provided in this embodiment also has a distinctive structural design with respect to the first embodiment:

with reference to fig. 1, 2, and 9 to 12, the blunt edge surface 21 of the rigid movable die plate 2 is in surface contact or line contact with the flexible die plate 3, the surface contact or line contact between the blunt edge surface 21 and the flexible die plate 3 can increase the contact area between the two, and under the condition that the pressing force between the two is the same, the larger the contact area between the rigid movable die plate 2 and the flexible die plate 3 is, the smaller the pressure is, so as to avoid stress concentration at the contact part, thereby prolonging the service life of the rigid movable die plate 2 and the flexible die plate 3.

Further, the blunt prism surface 21 abuts against the stop surface 31 of the flexible template 3, and the blunt prism surface 21 and the stop surface 31 include one or more of an inclined surface, a plane surface, a spherical surface and a curved surface. The shapes of the blunt edge surface 21 and the stop surface 31 can be adjusted according to the actual contact position between the blunt edge surface 21 and the stop surface 31, wherein the blunt edge surface 21 is a plane and a curved surface in fig. 11, and the stop surface 31 is an inclined surface and a curved surface in fig. 12.

With reference to fig. 1, 2, and 9 to 12, at least a portion of the flexible mold plate 3 is made of an elastic material, the two or more rigid movable mold plates 2 can move toward and/or away from each other under the action of the expansion mechanism 1, and at least a portion of the flexible mold plate 3 is made of an elastic material, so that the flexible mold plate 3 has a tendency or capability of self-resetting, and the flexible mold plate 3 can move more smoothly along with the rigid movable mold plates 2 when moving toward and/or away from each other.

Further, with reference to fig. 1, 2 and 9 to 12, between the positions where the flexible formworks 3 are connected to the two adjacent rigid movable formworks 2, there is a connecting section 32, and at least a portion of the connecting section 32 is made of an elastic material. Meanwhile, the flexible die plate 3 serves as a member for sealingly engaging two adjacent rigid movable die plates 2, and the flexible die plate 3 needs to be connected to the rigid movable die plates 2, and only at least a part of the engaging section 32 is made of an elastic material, so that on the basis of the foregoing advantages, since other materials, such as plastic or steel with small plastic deformation, can be selected for the flexible die plate 3 at the position where the flexible die plate 3 is connected to the rigid movable die plates 2, the connection reliability between the rigid movable die plates 2 and the flexible die plates 3 can be ensured.

Further, the outer contour line of the cross section of the core mold gradually expands from one end to the other end in the longitudinal direction thereof. The advantage of this arrangement is that when the core mold needs to be taken out of the hollow prefabricated member, it is usually in a form of being drawn out from one end of the hollow prefabricated member, the core mold may shake or be bent in a section due to its own weight during the drawing process, and the outer contour line of the cross section of the core mold from one end to the other end is set to be gradually reduced, which is equivalent to that the core mold is gradually reduced from one end to the other end, so that the core mold can be drawn out from the end with the largest outer contour of the cross section of the core mold during the demolding process, and the core mold which is not drawn out at this time shakes or the section is bent, and does not substantially collide with the inner wall of the hollow prefabricated member, thereby improving the drawing efficiency of the core mold and preventing the inner wall of the hollow prefabricated member from being damaged during the drawing process of the core mold, thereby ensuring the quality of the produced hollow prefabricated member.

Further, the rigid movable template 2 and the flexible template 3 are connected through one or more modes of fasteners, clamping, bonding and magnetic attraction. The specific connection form is not limited, as long as the rigid movable template 2 and the flexible template 3 can be firmly connected, and meanwhile, the flexible template 3 is not separated from the rigid movable template 2 all the time in the expanding and/or contracting process of the rigid movable template 2.

Further, referring to fig. 1 and 2, the flexible formworks 3 are disposed outside the rigid movable formworks 2, which has the advantage that the flexible formworks 3 are more conveniently separated from the concrete relative to the rigid movable formworks 2, thereby improving the smoothness of approaching and/or separating more than two rigid movable formworks 2.

Further, referring to fig. 13 with additional reference to fig. 1 and 2, the flexible mold plate 3 is a strip, the core mold shown in fig. 13 has four strip-shaped flexible mold plates 3, the side wall of each flexible mold plate 3 is connected to two rigid movable mold plates 2, and the strip-shaped flexible mold plates 3 can reduce the total volume of the flexible mold plates 3, thereby saving cost. Fig. 14 shows a flexible template 3 in the form of a ring surrounding four rigid moveable templates 2.

Further, with continuing reference to fig. 13 and with additional reference to fig. 1 and 2, the expanding and contracting mechanism 1 includes a hollow bladder 5 capable of expanding and contracting in a radial direction, wherein the expansion of the bladder 5 enables the separation of the two or more rigid movable mold plates 2, and the contraction of the bladder 5 enables the approach of the two or more rigid movable mold plates 2. The closing together can be achieved by the ability of the flexible template 3 to reposition itself, or by external means.

Further, referring to fig. 14 and with additional reference to fig. 1 and 2, the expansion and contraction mechanism 1 includes an expansion piece 6 having a telescopic function, at least one end of the expansion piece 6 is connected to the inner side of the rigid movable mold plate 2, and the rigid movable mold plate 2 can be moved along the central axis of the core mold. When the extensible member 6 is extended, the rigid movable die plate 2 is away from the central axis of the core mold, and when the extensible member 6 is retracted, the rigid movable die plate 2 is close to the central axis of the core mold. Fig. 14 shows a mode in which four ends of the extensible member 6 are respectively disposed inside four rigid movable formworks 2, and actually, the extensible member 6 is made into an angle shape, and two ends of the extensible member 6 are respectively disposed inside two adjacent rigid movable formworks 2, or the extensible member 6 is made into a straight shape, and two ends of the extensible member 6 are respectively disposed inside two opposite rigid movable formworks 2. In practice, it is sufficient to move the rigid movable die plate 2 toward the central axis of the core mold.

Further, referring to fig. 1 and 6, the rigid movable mold plate 2 is provided with a mounting hole 23, the mounting hole 23 is convenient for maintenance and replacement of parts in the core mold, and the mounting hole 23 can be blocked by an adaptive cover plate 24 after use. The rigid movable template 2 is also provided with a reinforcing rib 25, so that the integral compression-resistant bearing capacity of the core mold can be improved.

< example three >

In this embodiment, the same portions as those in the first and second embodiments are given the same reference numerals, and the same description is omitted.

Compared with the first embodiment and the second embodiment, the core mold for producing the hollow prefabricated part provided by the embodiment has the following different structural design:

referring to fig. 1 to 3, the expansion and contraction mechanism 1 includes at least one movable mandrel 11, the movable mandrel 11 is connected to the rigid movable mold plate 2 through a plurality of hinge assemblies 12 spaced along the length direction of the movable mandrel 11, and the hinge assemblies 12 are respectively connected to the movable mandrel 11 and the rigid movable mold plate 2 in a rotating manner. So set up, when pulling movable core axle 11 along movable core axle 11 length direction, movable core axle 11 moves earlier, treats that articulated subassembly 12 rotates to the critical point, pulls rigid movable mould board 2 and removes again.

Specifically, referring to fig. 3 to 4 and with additional reference to fig. 6, the hinge assembly 12 includes an ear seat 121 connected to the movable core shaft 11 and the rigid movable mold plate 2, respectively, and a support plate 122 connected to the two ear seats 121, wherein the ear seat 121 and the support plate 122 are connected to a locking pin 124 through a pin 123.

Further, referring to fig. 3 to 6, at least a portion of the hinge assemblies 12 mounted on the same rigid movable mold plate 2 are sliding hinge assemblies 12, at least one of the rigid movable mold plate 2 and the movable core shaft 11 can slide relative to the sliding hinge assembly 12 along the length direction of the movable core shaft 11 by a predetermined distance, the sliding hinge assembly includes at least one ear seat 121 connected to the rigid movable mold plate 2 and at least one ear seat 121 connected to the movable core shaft 11, and at least one of the ear seat 121 connected to the rigid movable mold plate 2 and the ear seat 121 connected to the movable core shaft 11 is provided with a kidney-shaped hole 125 extending along the length direction of the movable core shaft 11 by a predetermined distance.

Specifically, referring to fig. 3 to 6, at least one ear seat 121 of the sliding hinge assembly 12 is provided with a waist-shaped hole 125, and if the ear seat 121 connected to the movable core shaft 11 is provided with the waist-shaped hole 125, the movable core shaft 11 can slide along the length direction of the movable core shaft 11 by a predetermined distance relative to the sliding hinge assembly 12, and the determining factors of the predetermined distance include the distance of the waist-shaped hole 125 along the length direction of the movable core shaft 11 and the radial dimension of the pin shaft 123. Specifically, when the movable core shaft 11 moves, the movable core shaft 11 moves relative to the sliding hinge assembly 12, at this time, the sliding hinge assembly 12 does not rotate, after the movable core shaft 11 slides for a predetermined distance, the pin shaft 123 abuts against the ear seat 121, and at this time, if the movable core shaft 11 continues to move, the sliding hinge assembly 12 rotates.

It can be understood that if different sliding hinge assemblies 12 are provided on different rigid movable templates 2, the sequential movement of the different rigid movable templates 2 can be realized; if the same sliding hinge assemblies 12 are arranged on the same cross section of different rigid movable templates 2 and the sliding distances of the sliding hinge assemblies 12 along the length direction of the movable core shaft 11 are different, the different positions of the rigid movable templates 2 can be moved successively. After the hollow prefabricated member is manufactured, the inner wall surface of the hollow prefabricated member is bonded with the outer surface of the core mold, and at this time, a large driving force is usually required to separate the core mold. The former corresponds to a reduction in the number of the rigid blades 2 moving simultaneously, and the latter corresponds to a reduction in the area of the rigid blades 2 moving simultaneously, both of which reduce the need for the driving force required to move the movable mandrel 11 relative to the absence of the sliding hinge assembly 12, and achieve a more labor-saving effect.

Further, referring to fig. 3, fig. 7 and fig. 8, with the aid of fig. 1 and fig. 2, the expanding and contracting mechanism 1 further includes a push-pull mechanism, the push-pull mechanism includes a rotating rod 131, an end of at least one movable mandrel 11 located at the end of the mandrel is in threaded connection with the rotating rod 131, the rotating rod 131 is in limited connection with the bearing mounting plate 133 along the length direction of the movable mandrel 11, and the rotating rod 131 can rotate to drive the movable mandrel 11 to reciprocate along the length direction thereof.

Specifically, referring to fig. 3, 7 and 8, and with additional reference to fig. 1 and 2, the end of the rotating rod 131 is threadedly coupled to the end of the movable core shaft 11. When the rotation rod 131 rotates, due to the feature of the screw transmission, if the rotation rod 131 is axially fixed, the movable core shaft 11 can be driven to move along the length direction thereof. The axial fixation of the rotating rod 131 may be achieved by an external member such as a fixing bracket or the like, and the rotation of the rotating rod 131 may be driven by a motor or the like.

Specifically, referring to fig. 3, fig. 6 to fig. 8, and with additional reference to fig. 1 and fig. 2, a connecting plate 26 is disposed on at least one of the rigid movable mold plates 2, the rotating rod 131 can pass through the connecting plate 26, the connecting plate 26 is provided with a radial kidney-shaped through hole having a radial width larger than a radial dimension of the rotating rod 131, and the connecting plate 26 can provide a certain supporting and limiting effect for the rotating rod 131. Further, in order to avoid the shaking of the rotating rod 131 and ensure the smooth rotation of the rotating rod 131, one end of the rotating rod 131, which is far away from the movable core shaft 11, is connected with a rolling bearing 132 arranged in a bearing seat 135 and a bearing cover 136, an adaptive bearing mounting plate 133 is arranged on at least one rigid movable template 2, and the bearing seat 135 and the bearing mounting plate 133 are connected through a connecting bolt 137. Further, the rotating rod 131 is provided with a limiting protrusion 134, and the limiting protrusion 134 can abut against one side of the bearing seat 135 close to the movable core shaft 11, so that the axial locking of the bearing and the rotating rod 131 is realized, and the bearing and the rotating rod 131 cannot axially move. Further, the rotating rod 131 is connected to the push-pull pin 138 at an end remote from the movable spindle 11, thereby facilitating the driving of the rotating rod 131 to rotate circumferentially. Referring to fig. 15, the end of the core remote from the turning rod 131 is preferably also connected to a corresponding support bar 139 and a connecting plate 26 through which the support bar 139 passes, so as to provide support to the core as a whole and prevent it from tilting or bending.

< example four >

In this embodiment, the same portions as those in the first to third embodiments are given the same reference numerals, and the same description is omitted.

The core mold for producing a hollow preform provided in this embodiment also has such a distinctive structural design as compared to the first to third embodiments:

referring to fig. 9, 10 and 16, the expansion and contraction mechanism 1 includes at least two movable mandrels 11, one end or both ends of the movable mandrel 11 in the length direction are provided with axial splicing portions, and two adjacent movable mandrels 11 are tightly connected by the axial splicing portions. If two movable mandrels 11 are included, the opposite ends of the two movable mandrels 11 are provided with axial splicing parts. If more than three movable mandrels 11 are included, at least two ends of the movable mandrel 11 in the middle position are provided with axial splicing parts. The number of the movable mandrels 11 is determined according to the length of the single movable mandrel 11 and the length of the finally manufactured hollow prefabricated part.

Further, referring to fig. 9, 10 and 16, the axial splicing portion includes a male splicing portion 111 and a female splicing portion 112 adapted to the male splicing portion 111, the male splicing portion 111 is disposed at an end of one of the two adjacent movable mandrels 11, the female splicing portion 112 is disposed at an end of the other of the two adjacent movable mandrels 11, and the male head 1111 of the male splicing portion 111 and the female slot 1121 of the female splicing portion 112 form a tensile fit in a direction away from each other. Meaning that when pulling any one movable mandrel 11, the other movable mandrel 11 can follow the movement. Specifically, the male splice 111 and the female splice 112 may be in threaded connection with the movable core shaft 11, and the male joint 1111 and the female slot 1121 may be in snap connection, threaded connection, or other connection forms that can lock the two along the length direction of the movable core shaft 11. Referring to fig. 18, the male end 1112 of the male engaging portion 111 and the female slot 1121 of the female engaging portion 112 are threadedly engaged.

Further, referring to fig. 9 to 12 and 16, at least one partially protruding positioning plate 22 is disposed on the inner side of the end of the rigid movable mold plate 2, and two adjacent movable mandrels 11 are aligned axially through the positioning plate 22 when being spliced. The length of the movable mandrel 11 is usually longer, and the positioning plate 22 can basically realize the axial alignment of the movable mandrels 11, so that two adjacent movable mandrels 11 can be conveniently connected, and the connection efficiency can be improved. Specifically, the positioning plate 22 and the rigid movable template 2 may be connected by a connecting member, referring to fig. 11 and 12, a sealing gasket 27 is disposed between the positioning plate 22 and the rigid movable template 2, the sealing gasket 27 may ensure that foreign substances such as concrete do not enter a space enclosed by the rigid movable template 2 and the flexible template 3, and the screw 28 penetrates through the sealing gasket 27 to connect the rigid movable template 2 and the positioning plate 22.

< example five >

In the present embodiment, the same portions as those in the first to fourth embodiments are given the same reference numerals, and the same description is omitted.

Referring to fig. 17 in addition to fig. 1 and 2, the present embodiment provides a mold including the core mold for producing a hollow prefabricated part mentioned above and an outer mold 4, wherein the core mold is installed in a mold cavity of the outer mold 4. When the hollow prefabricated part is produced, other preparation work is finished, the core mould is arranged in a mould cavity of the outer mould 4, the expansion and contraction mechanism 1 is used for enabling the more than two rigid movable mould plates 2 to be away from each other, a larger space is occupied, a larger hollow part is formed, then concrete is poured, steam curing and other procedures required by production are carried out, after the hollow prefabricated part is produced, the expansion and contraction mechanism 1 is used for enabling the more than two rigid movable mould plates 2 to be close to each other, and then the core mould is pulled out of the hollow prefabricated part. The mold shown in fig. 17 is an open mold, but other forms such as a closed mold may be practically used. The mold according to this embodiment includes the core mold described above, and therefore has the technical effect of the core mold described above.

In the first to fifth embodiments, in the working process, some technical implementation manners of the first to fifth embodiments may be combined or replaced according to different working environments.

The technical principles of the present invention have been described above with reference to specific embodiments, but it should be noted that the above descriptions are only for explaining the principles of the present invention, and should not be interpreted as specifically limiting the scope of the present invention in any way. Based on the explanation here, those skilled in the art can conceive of other embodiments of the present invention or equivalent alternatives without creative efforts, and will fall into the protection scope of the present invention.

Claims (10)

1. The utility model provides a mandrel for producing hollow prefabricated component, its characterized in that encircles including at least an breathing mechanism (1) and two above circumference rigid movable mould board (2) that breathing mechanism (1) was arranged, wherein, more than two rigid movable mould board (2) by breathing mechanism (1) drives and draws close each other and/or keep away from, and adjacent two rigid movable mould board (2) are by flexible template (3) sealed linking, rigid movable mould board (2) encircle the ascending tip in direction in circumference be formed with can with blunt arris face (21) that flexible template (3) offset.

2. A core mold for producing a hollow prefabricated member according to claim 1, wherein the blunt edge surface (21) is in surface contact or line contact with the flexible mold plate (3);

and/or, blunt arris face (21) with backstop face (31) of flexible template (3) offset, blunt arris face (21) with backstop face (31) include one or several kinds in inclined plane, sphere and the curved surface.

3. A core mold for producing a hollow preform member as claimed in claim 1 or 2, wherein the flexible mold plate is made of an elastic material at least in part;

or a connecting section (32) is arranged between the positions where the flexible template (3) is connected with the two adjacent rigid movable templates (2), and at least part of the connecting section (32) is made of elastic materials;

and/or the outer contour line of the cross section of the core mould gradually decreases from one end to the other end in the length direction.

4. The core mould for producing the hollow prefabricated component as claimed in claim 1 or 2, wherein the rigid movable mould plate (2) is connected with the flexible mould plate (3) by one or more of fastening, clamping, bonding and magnetic attraction;

and/or the flexible template (3) is arranged outside the rigid movable template (2);

and/or the flexible template (3) is annular or strip-shaped;

and/or the expansion and contraction mechanism (1) comprises a hollow balloon which can be expanded and contracted in radial direction;

and/or the expansion mechanism (1) comprises an expansion piece with an expansion function, at least one end of the expansion piece is connected with the inner side of the rigid movable template (2), and the rigid movable template (2) can be driven to move along the central axis of the core mold.

5. A core mould for producing a hollow prefabricated section according to claim 1 or 2, characterized in that the expansion and contraction mechanism (1) comprises at least one movable mandrel (11), and the movable mandrel (11) is connected with the rigid movable mould plate (2) through a plurality of hinge assemblies (12) arranged at intervals along the length direction of the movable mandrel (11).

6. A core mould for producing a hollow prefabricated section according to claim 5, characterized in that at least a part of the number of hinge assemblies (12) mounted on the same rigid movable mould plate (2) are sliding hinge assemblies, and at least one of the rigid movable mould plate (2) and the movable mandrel (11) is slidable relative to the sliding hinge assemblies by a predetermined distance in a length direction of the movable mandrel (11);

the sliding hinge assembly comprises at least one ear seat (121) connected with the rigid movable template (2) and at least one ear seat (121) connected with the movable mandrel (11), and at least one of the ear seat (121) connected with the rigid movable template (2) and the ear seat (121) connected with the movable mandrel (11) is provided with a kidney-shaped hole (125) extending for a preset distance along the length direction of the movable mandrel (11).

7. A core mould for producing a hollow prefabricated part according to claim 6, wherein the expanding and contracting mechanism (1) further comprises a push-pull assembly (13), the push-pull assembly (13) comprises a rotating rod (131), at least one movable core shaft (11) at the end of the core mould is in threaded connection with the rotating rod (131), the rotating rod (131) is in limit connection with a bearing mounting plate (133) along the length direction of the movable core shaft (11), and the rotating rod (131) can rotate so as to drive the movable core shaft (11) to reciprocate along the length direction of the movable core shaft.

8. A mandrel for producing a hollow prefabricated member according to claim 1 or 2, wherein the expansion and contraction mechanism (1) comprises at least two movable mandrels (11), one end or both ends of each movable mandrel (11) in the length direction are provided with axial splicing parts, and the adjacent two movable mandrels (11) are tightly connected through the axial splicing parts.

9. A mandrel for producing a hollow preform member as claimed in claim 8, wherein the axial splices comprise a male splice (111) and a female splice (112) adapted to the male splice (111), the male splice (111) is provided at an end of one of two adjacent movable mandrels (11), the female splice (112) is provided at an end of the other of two adjacent movable mandrels (11), and a male head (1111) of the male splice (111) and a female groove (1121) of the female splice (112) form a tensile fit in directions away from each other;

and/or at least one positioning plate (22) with a part protruding is arranged on the inner side of the end part of the rigid movable template (2), and two adjacent movable mandrels (11) are axially aligned through the positioning plate (22) when spliced.

10. A mold comprising any one of the core molds for producing a hollow preform member as claimed in claims 1 to 9, characterized by further comprising an outer mold (4), the core mold being fitted into a cavity of the outer mold (4).

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