CN-121973316-A - Integral exit type die device for prefabricated box girder and demolding method of integral exit type die device

CN121973316ACN 121973316 ACN121973316 ACN 121973316ACN-121973316-A

Abstract

The invention discloses an integral withdrawing type die device for a prefabricated box girder, which comprises a support frame, wherein an outer die assembly is arranged on the support frame, a cavity between an inner die support assembly and the outer die assembly is a cavity, the inner die support assembly comprises a plurality of inner die support units which are sequentially attached and arranged along the front and the back, each inner die support unit comprises an inner die movable plate and an inner die fixed plate which are in butt joint up and down, each inner die movable plate comprises an inner die movable top plate and inner die movable side plates on the left side and the right side, the inner die movable top plates are always elastically attached to support steps of the two inner die movable side plates, the inner die movable plates integrally form an inverted U shape with a necking bottom end, the left and the right inner die movable side plates are driven by a telescopic driving mechanism to synchronously stretch along the oblique directions of bilateral symmetry, and an ejection assembly for pushing the bottom of the prefabricated box girder upwards is arranged below an outer die bottom plate. The invention also discloses a demolding method for the prefabricated box girder. The invention has the advantages of realizing convenient, smooth and nondestructive demoulding of the prefabricated box girder.

Inventors

MIAO LIXIN
WANG YUN
GU XIAOYU
ZHOU JIE
CHEN HUIJUAN
LI ZIJIAN
CHEN SHUYAN
CHEN DANHUI
ZHANG ZHIHUA

Assignees

常州先进制造技术研究所

Dates

Publication Date: 20260505
Application Date: 20260204

Claims (10)

1. The integral exit type die device for the prefabricated box girder comprises a support frame (1), wherein an outer die assembly is arranged on the support frame (1), the outer die assembly comprises an outer die bottom plate (2) and an outer die top plate (3) covered at the top end of the outer die bottom plate (2), a containing cavity is defined between the outer die bottom plate (2) and the outer die top plate (3), an inner die supporting assembly (5) is arranged in the containing cavity of the outer die assembly, a cavity between the inner die supporting assembly (5) and the outer die assembly is a cavity extending forwards and backwards, the shape of the cavity is identical to that of the prefabricated box girder (6), and the integral exit type die device is characterized in that the inner die supporting assembly (5) comprises a plurality of inner die supporting units which are sequentially laminated and distributed along the front and the back; Each internal mold supporting unit comprises an internal mold movable plate and an internal mold fixed plate (7) which are in up-down butt joint, wherein the internal mold fixed plate (7) is in a U shape with a flaring at the top end, the internal mold movable plate comprises an internal mold movable top plate (8) positioned in the middle and internal mold movable side plates (9) positioned at the left side and the right side, the internal mold movable plate integrally forms an inverted U shape with a necking at the bottom end, supporting steps (10) are respectively arranged at the inner sides of the tops of the two internal mold movable side plates (9), and the left end and the right end of the internal mold movable top plate (8) are supported through the supporting steps (10) of the two internal mold movable side plates (9); The bottom of the inner mold movable plate is supported by an inner mold movable supporting mechanism, the inner mold movable supporting mechanism comprises an inner mold movable base (11), the bottom of the inner mold movable base (11) is supported on the bottom wall of an inner groove of the inner mold fixed plate (7) in a sliding manner and can only slide forwards and backwards, a telescopic driving structure and a first elastic supporting structure are arranged on the inner mold movable base (11), the left and right inner mold movable side plates (9) are driven by the telescopic driving mechanism to synchronously stretch along the bilaterally symmetrical inclined directions, and downward elastic tension is applied to the inner mold movable top plate (8) by the first elastic supporting structure, so that the two inner mold movable side plates (9) are always elastically attached to supporting steps (10) of the two inner mold movable side plates (9) in the moving process; an ejection assembly (24) is arranged below the outer die bottom plate (2), and the bottom of the prefabricated box girder (6) molded in the cavity is pushed upwards through the ejection assembly (24).
2. The integral ejection type die device for the prefabricated box girder according to claim 1, wherein the ejection assembly (24) comprises a plurality of ejection units which are sequentially attached and arranged along the front and back directions, each ejection unit comprises a plurality of ejection blocks (25) which are arranged along the front and back directions, the bottom wall of the outer die bottom plate (2) is provided with ejection through holes (26) for the ejection blocks (25) to pass through, and the ejection driving mechanism drives the ejection blocks (25) to move up and down, so that the ejection blocks (25) extend upwards or retract downwards to the ejection through holes (26) on the bottom wall of the outer die bottom plate (2), and whether the prefabricated box girder (6) in a die cavity is ejected or not is controlled.
3. The integrated ejection type die device for the prefabricated box girder is characterized in that the ejection driving machine comprises a movable frame (27) which is arranged on a supporting frame (1) in a sliding mode, a plurality of bevel edge extrusion seats (29) which are arranged in a front-back mode are arranged on the movable frame (27), the plurality of bevel edge extrusion seats (29) are in one-to-one correspondence with the plurality of ejection blocks (25), a guide chute (30) is formed in the top of each bevel edge extrusion seat (29), the bottom wall surface of the guide chute (30) is an inclined surface which inclines in the left-right direction, an ejection shaft (31) is arranged in the guide chute (30) of the bevel edge extrusion seat (29) in a sliding mode, the top end of the ejection shaft (31) is in sliding fit with the ejection blocks (25), the bottom ends of the ejection blocks (25) are connected with the ejection shaft (31) through a second elastic supporting structure, the first hydraulic cylinder (34) drives the movable frame (27) to slide left and right, and drives the plurality of extrusion seats (29) on the movable frame (27) to slide left and right under the action of the inclined surface.
4. The integrally ejecting die device for prefabricated box girders as set forth in claim 1, wherein the telescopic driving mechanism is specifically configured as follows: The movable base (11) of the inner mold is fixedly provided with a linear shaft (15) which extends forwards and backwards, a movable sleeve (17) is sleeved on the linear shaft (15) in a sliding manner and can only slide along the axial direction of the linear shaft (15), two groups of telescopic driving assemblies (18) which are bilaterally symmetrical are arranged on the upper portion of the movable sleeve (17), the movable sleeve (17) is respectively connected with the left inner mold movable side plate and the right inner mold movable side plate (9) through the two groups of telescopic driving assemblies (18), the movable sleeve (17) is driven to slide forwards and backwards along the linear shaft (15) through a second hydraulic cylinder (19), and the two inner mold movable side plates (9) are respectively driven to synchronously stretch along the radial direction of the movable sleeve (17) by virtue of the two groups of telescopic driving assemblies (18).
5. The integral withdrawal type mold device for prefabricated box girders, as set forth in claim 4, characterized in that the telescopic driving assembly (18) comprises a first fixed block (20) and a first sliding block (21) which are arranged along the radial inside and outside of the movable sleeve (17), the first fixed block (20) is fixed on the movable sleeve (17), the first sliding block (21) is fixed on the inner mold movable side plate (9) at the corresponding side, the first fixed block (20) and the first sliding block (21) are in inclined sliding fit with the first inclined sliding block (23) through a first inclined guide rail (22), when the movable sleeve (17) slides back and forth on the linear shaft (15), the two first fixed blocks (20) are driven to move back and forth, and under the action of the inclined matching, the two first fixed blocks (20) drive the two first sliding blocks (21) to simultaneously stretch along the radial direction of the movable sleeve (17).
6. An integrally withdrawn mould device for prefabricated box girders as claimed in claim 3, characterized in that the bottom end of the ejector shaft (31) is provided with a first roller (32), and the ejector shaft (31) is in sliding fit with a guide chute (30) of the hypotenuse extrusion seat (29) through the first roller (32) at the bottom.
7. The integral withdrawing type die device for the prefabricated box girder, as claimed in claim 1, is characterized in that at least two slide ways (12) which are arranged left and right are arranged on the bottom wall of the inner groove of the inner die fixing plate (7), the slide ways (12) extend along the front and rear directions, a plurality of second rollers are rotatably arranged at the bottom of the inner die movable base (11), and the second rollers at the bottom of the inner die movable base (11) are in sliding fit with the slide ways (12) on the bottom wall of the inner groove of the inner die fixing plate (7).
8. An integrally withdrawn mould device for prefabricated box girders as claimed in claim 1, characterized in that the first elastic supporting structure comprises a plurality of first elastic supporting components, the first elastic supporting components comprise supporting rods (13) fixed on the movable base (11) of the inner mould, so as to be fixed on first springs (14) at the tops of the supporting rods (13), and the tops of the first springs (14) are fixedly connected with the movable top plate (8) of the inner mould.
9. A unitary ejection die assembly for prefabricated box girders as set forth in claim 3, characterized in that said second resilient support structure is a second spring (33).
10. A demoulding method for a prefabricated box girder, wherein the prefabricated box girder (6) comprises a box girder top plate, a left box girder web plate, a right box girder web plate and a box girder bottom plate, and is characterized in that the demoulding method is based on the integral withdrawal type mould device for the prefabricated box girder, which is used for the prefabricated box girder, according to any one of claims 1 to 9, the prefabricated box girder (6) enters a demoulding stage after being cast, solidified and formed in a cavity of the mould device, and the demoulding method in the demoulding stage is carried out according to the following steps: Step one, detaching an outer die top plate (3); Step two, the telescopic driving mechanism of each internal mold supporting unit of the internal mold supporting assembly (5) acts to drive the corresponding left and right internal mold movable side plates (9) to synchronously and inwards stretch, and the internal mold movable top plate (8) moves downwards along with the movement of the two internal mold movable side plates (9) so that the internal mold movable plate is separated from the upper sections of the box girder top plate and the left and right box girder webs; Step three, the movable supporting mechanism of the internal mold and the movable plate of the internal mold integrally slide along the front and back direction from the bottom wall of the inner groove of the fixed plate (7) of the internal mold, so that the movable supporting mechanism of the internal mold and the movable plate of the internal mold of each internal mold supporting unit slide out of the fixed plate (7) of the internal mold; step four, detaching the inner mold fixing plates (7) of all the inner mold supporting units of the inner mold supporting assembly (5) so that all the inner mold fixing plates (7) are separated from the lower sections of the bottom plate of the box girder and the webs of the left and right box girders; Step five, the ejection assembly (24) acts, and the bottom of the prefabricated box girder (6) is pushed upwards through the ejection assembly (24), so that the prefabricated box girder (6) is separated from the outer die bottom plate (2), and demoulding is completed.

Description

Integral exit type die device for prefabricated box girder and demolding method of integral exit type die device Technical Field The invention relates to the technical field of production equipment of prefabricated box girders, in particular to an integral withdrawal type die device for the prefabricated box girders and a demolding method thereof. Background The prefabricated box girder is mainly used for bridge construction, and is generally prefabricated integrally at present, and the length is generally between 20 and 30 meters. After prefabrication is completed, the prefabricated steel plate is transported to a bridge construction site for modular assembly. However, the existing prefabricated box girder assembling process has the common problems that temporary factories are usually built nearby the bridge for assembling, and a manual demoulding mode is adopted in most cases. Because the internal mold is mostly fixed and can not be dismantled, the prefabricated box girder is often closely adhered with the internal film and the external mold when the prefabricated box girder is demolded, and the bottom surface and the side surface are uneven, and complete demolding is difficult. In addition, the prefabricated box girder is great in weight, and the workman need bore narrow and small inner space and cuts and dismantle, and the segmentation is demolishd inside and is supported the mould, and the operation is very inconvenient, wastes time and energy, and has the potential safety hazard. Disclosure of Invention The invention aims to overcome the defects of the prior art and provides an integral withdrawal type die device for a prefabricated box girder and a demolding method thereof, so as to realize convenient, smooth and nondestructive demolding of the prefabricated box girder. The invention is realized by the following technical scheme: The integral exit type die device for the prefabricated box girder comprises a support frame, wherein an outer die assembly is arranged on the support frame, the outer die assembly comprises an outer die bottom plate and an outer die top plate covered on the top end of the outer die bottom plate, a containing cavity is defined between the outer die bottom plate and the outer die top plate, an inner die supporting assembly is arranged in the containing cavity of the outer die assembly, a cavity between the inner die supporting assembly and the outer die assembly is a cavity extending forwards and backwards, the shape of the cavity is identical to that of the prefabricated box girder, and the inner die supporting assembly comprises a plurality of inner die supporting units which are sequentially laminated and arranged along the front and the back; each internal mold supporting unit comprises an internal mold movable plate and an internal mold fixed plate which are in butt joint up and down, wherein the internal mold fixed plate is in a U shape with a flaring at the top end, the internal mold movable plate comprises an internal mold movable top plate positioned in the middle and internal mold movable side plates positioned at the left side and the right side, the internal mold movable plate integrally forms an inverted U shape with a necking at the bottom end, the inner sides of the top parts of the two internal mold movable side plates are respectively provided with a supporting step, and the left end and the right end of the internal mold movable top plate are supported by the supporting steps of the two internal mold movable side plates; The bottom of the inner mold movable plate is supported by an inner mold movable supporting mechanism, the inner mold movable supporting mechanism comprises an inner mold movable base, the bottom of the inner mold movable base is supported on the bottom wall of an inner groove of the inner mold fixed plate in a sliding manner and can only slide back and forth, a telescopic driving structure and a first elastic supporting structure are arranged on the inner mold movable base, the left and right inner mold movable side plates are driven by the telescopic driving structure to synchronously stretch along the bilaterally symmetrical oblique directions, and downward elastic tension is applied to the inner mold movable top plate by the first elastic supporting structure, so that the two inner mold movable side plates are always elastically attached to supporting steps of the two inner mold movable side plates in the moving process; and an ejection assembly is arranged below the outer die bottom plate, and the bottom of the prefabricated box girder formed in the cavity is pushed upwards through the ejection assembly. As the preferred scheme of the integral withdrawal type die device for the prefabricated box girder, the ejection assembly comprises a plurality of ejection units which are sequentially attached and arranged along the front and back directions, each ejection unit comprises a plurality of ejection blocks which are arranged along the fron