Totally-enclosed hydraulic demoulding device for internal mould of small box girder

Abstract

The invention relates to the technical field of concrete pouring, in particular to a full-closed small box girder internal mold hydraulic demolding device which comprises a forming bottom plate, movable side plates, demolding side plates and a forming top plate. And demolding side plates are rotationally arranged on the left side and the right side of the top of the forming bottom plate through hinges. A closed pouring forming cavity is jointly formed by the forming bottom plate, the movable side plates, the demolding side plates and the forming top plate, concrete slurry leakage is prevented, it is guaranteed that concrete is evenly distributed, and it is guaranteed that all components are connected tightly and the positions are accurate through cooperation of limiting blocks at the bottom of the forming top plate and limiting grooves in the tops of the side plates; the size precision and shape regularity of the small box girder are guaranteed, steel bar positioning holes in the demolding side plates are matched with the fixed supporting frame, the movable supporting frame and the rotary supporting ring, accurate positioning is provided for steel bars, displacement of the steel bars in the concrete pouring process is avoided, and the structural strength and stability of the small box girder are improved.

Description

Technical Field

[0001] The invention relates to the technical field of concrete pouring, in particular to a fully enclosed small box beam inner mold hydraulic demoulding device. Background Art

[0002] In the production process of fully enclosed small box girders, the traditional inner mold structure is often relatively simple, and it is easy to leak during the concrete pouring process, resulting in poor molding quality of the small box girder. In addition, the traditional demoulding method is often not smooth enough during the demoulding process, which is easy to damage the concrete structure of the small box girder and the inner mold itself, increasing maintenance costs and construction time. At the same time, the traditional steel bar positioning method is not accurate enough, which is easy to cause the steel bar to shift during the concrete pouring process, affecting the structural strength and stability of the small box girder.

[0003] The existing demoulding devices for small box girders also have certain limitations during use. The components of some demoulding devices are not connected tightly enough, and position deviations are likely to occur during concrete pouring, affecting the dimensional accuracy and shape regularity of the small box girder. The demoulding efficiency of some demoulding devices is low, and the demoulding process is complicated, requiring a lot of manpower and time. In addition, many existing devices lack effective auxiliary positioning measures in the steel bar laying link, making the steel bar laying process difficult and prone to safety hazards.

[0004] Therefore, we proposed a fully enclosed small box girder inner mold hydraulic demoulding device. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention provides a fully enclosed small box beam inner mold hydraulic demoulding device to solve the above-mentioned technical defects.

[0006] To achieve the above objectives, the present invention is implemented through the following technical scheme: a fully enclosed small box beam inner mold hydraulic demolding device, comprising a forming bottom plate, a movable side plate, a demolding side plate and a forming top plate, the front and rear sides of the top of the forming bottom plate are both provided with movable side plates by hinge rotation, and the left and right sides of the top of the forming bottom plate are both provided with demolding side plates by hinge rotation, the tops of the two movable side plates and the two demolding side plates are both movably provided with forming top plates, the opposite sides of the two demolding side plates are both provided with a plurality of steel bar positioning holes, a fixed support frame is placed on the top of the forming bottom plate, and the front and rear sides of the top of the fixed support frame are both rotatably provided with flip support side frames, the tops of the two flip support side frames are movably provided with movable support frames, and the opposite sides of the two flip support side frames are both fixedly provided with a plurality of rotating support rings; wherein the rotating support ring is composed of two flexibly rotating annular structures, and the tops of the fixed support frame and the movable support frame are both provided with a plurality of arc-shaped support frames;

[0007] Demolding holes are arranged inside the two demoulding side plates, and a plurality of inner molding molds are arranged between opposite sides of the two demoulding side plates.

[0008] Preferably, limiting blocks are fixedly arranged around the bottom of the forming top plate, and the tops of the two movable side plates and the two demolding side plates are provided with limiting grooves that cooperate with the limiting blocks, and the bottoms of the four limiting blocks are respectively movably connected to the inside of the four limiting grooves.

[0009] Preferably, two rotating connecting rods are rotatably provided on one side of two adjacent molding inner molds, and connecting thread blocks are fixedly provided on the side opposite to the molding inner mold located on the far left and the molding inner mold located on the far right, and electric heating wires are provided inside several molding inner molds.

[0010] Preferably, two hydraulic cylinders are fixedly provided on the opposite sides of the two movable side plates, and a demoulding frame is movably provided on one side of the two demoulding side plates, and connecting threaded holes are provided on the opposite sides of the two demoulding frames, and the interiors of the two connecting threaded holes are respectively threadedly connected to one end of the two connecting threaded blocks.

[0011] Preferably, connecting holes are provided on the front and rear sides inside the two demolding frames, and the driving ends of the two hydraulic cylinders on the left and right sides respectively penetrate the connecting holes inside the two demolding frames, and two connecting nuts are threadedly provided on one side of the two demolding frames, and the insides of the four connecting nuts are respectively threadedly connected to the driving ends of the four hydraulic cylinders.

[0012] Preferably, the method for using the fully enclosed small box beam inner mold hydraulic demoulding device comprises the following steps:

[0013] Step 1: When casting and forming the small box beam, a closed casting and forming cavity is formed by the movable side plates arranged on the front and rear sides of the top of the forming bottom plate, the demoulding side plates arranged on the left and right sides, and the forming top plate arranged on the top, and the limiting blocks at the bottom of the forming top plate are matched with the limiting grooves at the tops of the movable side plates and the demoulding side plates;

[0014] Step 2. When casting and forming the small box girder, first flip the demoulding side plate set on the left side of the top of the forming bottom plate to a vertical state, pass the left ends of several steel bars through the fixed support frame, the top of the movable support frame and the inside of several rotating support rings, then insert the left ends of several steel bars into the steel bar positioning holes located inside the left demoulding side plate, and then flip the demoulding side plate set on the right side of the top of the forming bottom plate to a vertical state, insert the right ends of several steel bars into the steel bar positioning holes located inside the right demoulding side plate, and then unlock several rotating support rings, rotate and flip the support side frame forward and backward, remove the movable support frame from under the steel bars, and finally take out the fixed support frame from the top of the forming bottom plate to complete the rapid laying of steel bars for casting and forming the small box girder;

[0015] Step three, when hydraulically demolding the fully enclosed small box girder inner mold, the left and right demolding frames are controlled by the hydraulic cylinders on both sides arranged on the two movable side plates to drive the two sets of molding inner molds to pass through the demolding holes inside the two demolding side plates for demolding and removal. Since the two sets of molding inner molds are composed of several parts, when demolding the molding inner mold, the electric heating wire arranged inside the molding inner mold is used for heating treatment. When demolding, heating treatment is performed to reduce the bonding force between the molding inner mold 7 and the inner wall of the small box girder, thereby achieving rapid demolding.

[0016] Compared with the prior art, it has the following beneficial effects:

[0017] 1. The present invention effectively improves the forming quality of the small box girder through multiple design details. The forming bottom plate, movable side plate, demoulding side plate and forming top plate are used to form a closed casting and molding cavity to prevent concrete leakage, ensure uniform distribution of concrete, and improve the overall molding quality. The limiting block at the bottom of the forming top plate cooperates with the limiting groove at the top of the side plate to ensure that the components are tightly connected and accurately positioned, and the dimensional accuracy and shape regularity of the small box girder are guaranteed. The steel bar positioning holes on the demoulding side plate cooperate with the fixed support frame, the movable support frame and the rotating support ring to provide accurate positioning for the steel bars, avoid displacement of the steel bars during concrete pouring, and improve the structural strength and stability of the small box girder.

[0018] 2. In the present invention, the movable side panels, the demoulding side panels and the forming bottom panel are rotatably connected by hinges, which can be flexibly opened during demoulding, making the demoulding process smoother and reducing the risk of damage to the structure. The hydraulic cylinder controls the demoulding frame to drive the forming inner mold to be demoulded and removed through the demoulding holes of the demoulding side panels. The forming inner mold composed of multiple components can be heated by the internal heating wire during demoulding to reduce the bonding force with the inner wall of the small box beam, thereby achieving rapid demoulding, greatly shortening the demoulding time, and improving construction efficiency. At the same time, the design of each component is easy to operate. For example, the step-by-step process for laying steel bars is clear and concise, reducing the difficulty of operation. The detachable demoulding frame and the forming inner mold composed of multiple components are easy to maintain and replace, thereby improving the convenience and sustainability of construction.

[0019] 3. The present invention forms a stable overall structure, which can withstand pressure and impact force during concrete pouring and is not easily deformed or displaced, thereby ensuring the production quality and safety of small box girders. Components such as steel bar positioning holes and rotating support rings provide stable support for steel bars, preventing them from shaking or tilting during laying, thereby reducing construction safety risks. The precise control of the hydraulic cylinder and the stable structural connection make the demoulding process more stable and reliable, reducing the possibility of safety accidents caused by unstable demoulding and ensuring the life safety of construction workers.

[0020] Other features and advantages of the present invention will be set forth in the following description, and in part will become apparent from the description, or may be understood through implementation of the present invention. The objects and other advantages of the present invention may be realized and obtained through the structures indicated in the description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the structure of the hydraulic demoulding device for the inner mold of a fully enclosed small box beam according to an embodiment of the present invention;

[0022] Figure 2 A schematic diagram of a limit block and a limit groove structure according to an embodiment of the present invention;

[0023] Figure 3 It is a schematic diagram of the demoulding side plate and the steel bar positioning hole structure according to an embodiment of the present invention;

[0024] Figure 4 It is a schematic diagram of the structure of the molding bottom plate, the movable side plate and the demoulding side plate according to an embodiment of the present invention;

[0025] Figure 5 It is a schematic diagram of a fixed support frame, a movable support frame and a flip support side frame structure according to an embodiment of the present invention;

[0026] Figure 6 A schematic diagram of an inner mold structure according to an embodiment of the present invention;

[0027] Figure 7 It is a schematic diagram of the hydraulic cylinder and demoulding frame structure according to an embodiment of the present invention.

[0028] In the figure, 1. forming bottom plate; 2. movable side plate; 3. demoulding side plate; 4. forming top plate; 5. limiting block; 6. limiting groove; 7. forming inner mold; 8. rotating connecting rod; 9. connecting threaded block; 10. demoulding frame; 11. connecting threaded hole; 12. hydraulic cylinder; 13. connecting hole; 14. connecting nut; 15. steel bar positioning hole; 16. fixed support frame; 17. movable support frame; 18. flip support side frame; 19. rotating support ring; 20. demoulding hole. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] Embodiment 1:

[0031] See also Figures 1 to 7As shown, a fully enclosed small box beam inner mold hydraulic demoulding device comprises a forming bottom plate 1, a movable side plate 2, a demoulding side plate 3 and a forming top plate 4, the front and rear sides of the top of the forming bottom plate 1 are both provided with movable side plates 2 by hinge rotation, and the left and right sides of the top of the forming bottom plate 1 are both provided with demoulding side plates 3 by hinge rotation, the tops of the two movable side plates 2 and the two demoulding side plates 3 are both provided with a forming top plate 4 movably, and the four sides of the bottom of the forming top plate 4 are all fixedly provided with limiting blocks 5, the tops of the two movable side plates 2 and the two demoulding side plates 3 are all provided with limiting grooves 6 matched with the limiting blocks 5, and the bottoms of the four limiting blocks 5 are respectively movably connected with the insides of the four limiting grooves 6;

[0032] It should be noted that when the small box girder is cast and formed, a closed casting and forming cavity is formed by the movable side plates 2 arranged on the front and rear sides of the top of the forming bottom plate 1, the demoulding side plates 3 arranged on the left and right sides, and the forming top plate 4 arranged on the top, which can effectively prevent leakage of concrete during the casting process and ensure uniform distribution of concrete, thereby improving the overall forming quality of the small box girder; at the same time, the limiting block 5 at the bottom of the forming top plate 4 is matched with the limiting grooves 6 on the top of the movable side plate 2 and the demoulding side plate 3, so that the components are tightly connected and accurately positioned during the casting process, ensuring the dimensional accuracy and shape regularity of the small box girder and reducing quality problems caused by dimensional deviations.

[0033] The movable side panels 2, the demoulding side panels 3 and the forming bottom plate 1 are rotatably connected through hinges, and can be flexibly opened as needed during demoulding, which provides convenience for demoulding, makes the demoulding process smoother, and reduces the risk of damage to the inner mold and concrete structure during demoulding. Through the cooperation of various components, a stable overall structure is formed. During the concrete pouring process, it can withstand the pressure and impact force of concrete, is not prone to deformation or displacement, and ensures the production quality and safety of small box girders.

[0034] Specifically, a plurality of steel bar positioning holes 15 are provided on opposite sides of the two demoulding side plates 3, a fixed support frame 16 is placed on the top of the forming base plate 1, and a flip support side frame 18 is rotatably provided on the front and rear sides of the top of the fixed support frame 16, a movable support frame 17 is movably placed on the top of the two flip support side frames 18, and a plurality of rotating support rings 19 are fixedly provided on opposite sides of the two flip support side frames 18; wherein, the rotating support ring 19 is composed of two flexibly rotating annular structures, and a plurality of arc-shaped support frames are provided on the tops of the fixed support frame 16 and the movable support frame 17.

[0035] It should be noted that when casting and forming the small box girder, the demoulding side plate 3 set on the left side of the top of the forming base plate 1 is first flipped to a vertical state, and the left ends of several steel bars are passed through the fixed support frame 16, the top of the movable support frame 17 and the interior of several rotating support rings 19, and then the left ends of several steel bars are inserted into the steel bar positioning holes 15 located inside the left demoulding side plate 3, and then the demoulding side plate 3 set on the right side of the top of the forming base plate 1 is flipped to a vertical state, and the right ends of several steel bars are inserted into the steel bar positioning holes 15 located inside the right demoulding side plate 3, and then several rotating support rings 19 are unlocked, and the support side frame 18 is rotated and flipped forward and backward to remove the movable support frame 17 from under the steel bars, and finally the fixed support frame 16 is taken out from the top of the forming base plate 1 to complete the rapid laying of steel bars for casting and forming the small box girder.

[0036] By setting a plurality of steel bar positioning holes 15 on the two demoulding side plates 3, accurate positioning positions are provided for the steel bars. During the casting and forming process of the small box girder, the position of the steel bars is ensured to be accurate, and the steel bars are prevented from shifting during the concrete pouring process, thereby improving the structural strength and stability of the small box girder. At the same time, the rotating support rings 19 on the fixed support frame 16 and the movable support frame 17 are used to provide auxiliary support and positioning for the steel bars during the laying process. They cooperate with the steel bar positioning holes to provide stable support for the steel bars during the laying process, avoid shaking or tilting of the steel bars during the laying process, reduce the safety risks during the construction process, further improve the positioning accuracy of the steel bars, and ensure the quality of the small box girder.

[0037] Specifically, demolding holes 20 are provided inside the two demolding side plates 3, and a plurality of molding inner molds 7 are provided between the opposite sides of the two demolding side plates 3, two rotating connecting rods 8 are rotatably provided on one side of two adjacent molding inner molds 7, and connecting thread blocks 9 are fixedly provided on the side opposite to the molding inner mold 7 located on the far left and the molding inner mold 7 located on the far right, and electric heating wires are provided inside the plurality of molding inner molds 7, wherein two groups of molding inner molds 7 are provided between the opposite sides of the two demolding side plates 3, and the opposite sides of the two groups of molding inner molds 7 are movably clamped, and when hydraulic demolding of the fully enclosed small box girder inner mold is performed, the two groups of molding inner molds 7 can be driven by the demolding frames 10 on both sides to be demolded and removed through the demolding holes 20 inside the left and right demolding side plates 3.

[0038] Furthermore, two hydraulic cylinders 12 are fixedly provided on the opposite sides of the two movable side plates 2, and a demolding frame 10 is movably provided on one side of the two demolding side plates 3, and a connecting threaded hole 11 is provided on the opposite side of the two demolding frames 10, and the interiors of the two connecting threaded holes 11 are respectively threadedly connected to one end of the two connecting threaded blocks 9, and connecting holes 13 are provided on the front and rear sides of the two demolding frames 10, and the driving ends of the two hydraulic cylinders 12 on the left and right sides respectively pass through the connecting holes 13 inside the two demolding frames 10, and two connecting nuts 14 are threadedly provided on one side of the two demolding frames 10, and the interiors of the four connecting nuts 14 are respectively threadedly connected to the driving ends of the four hydraulic cylinders 12.

[0039] It should be noted that when the hydraulic demolding of the fully enclosed small box beam inner mold is performed, the demolding frames 10 on the left and right sides are controlled by the hydraulic cylinders 12 on both sides arranged on the two movable side plates 2 to drive the two sets of molding inner molds 7 to pass through the demolding holes 20 inside the two demolding side plates 3 for demolding and removal. Since the two sets of molding inner molds 7 are composed of several parts, when the molding inner mold 7 is demolded, the electric heating wire arranged inside the molding inner mold 7 is used for heating treatment. The heating treatment during demolding can effectively reduce the bonding force between the molding inner mold 7 and the inner wall of the small box beam, realize rapid demolding, greatly shorten the demolding time, and improve the construction efficiency, thereby realizing rapid demolding of the molding inner mold 7 and the inner wall of the small box beam;

[0040] In addition, the multi-component forming inner mold 7 and the detachable demoulding frame 10 and other components are convenient for maintenance and replacement during use. If a component is damaged or worn, it can be replaced in time without affecting the use of the entire demoulding device, thereby improving the convenience and sustainability of construction.

[0041] Embodiment 2:

[0042] Specifically, the present embodiment also discloses a method for using a fully enclosed small box beam inner mold hydraulic demoulding device, comprising the following steps:

[0043] Step 1: When casting and forming the small box beam, a closed casting and forming cavity is formed by the movable side plates 2 arranged on the front and rear sides of the top of the forming bottom plate 1, the demoulding side plates 3 arranged on the left and right sides, and the forming top plate 4 arranged on the top, and the limiting block 5 at the bottom of the forming top plate 4 is matched with the limiting grooves 6 on the tops of the movable side plates 2 and the demoulding side plates 3;

[0044] Step 2: When casting and forming the small box girder, first flip the demoulding side plate 3 set on the left side of the top of the forming bottom plate 1 to a vertical state, pass the left ends of several steel bars through the fixed support frame 16, the top of the movable support frame 17 and the interior of several rotating support rings 19, then insert the left ends of several steel bars into the steel bar positioning holes 15 located inside the left demoulding side plate 3, and then flip the demoulding side plate 3 set on the right side of the top of the forming bottom plate 1 to a vertical state, insert the right ends of several steel bars into the steel bar positioning holes 15 located inside the right demoulding side plate 3, and then unlock several rotating support rings 19, rotate and flip the support side frame 18 forward and backward, remove the movable support frame 17 from under the steel bars, and finally take out the fixed support frame 16 from the top of the forming bottom plate 1, and complete the rapid laying of steel bars for casting and forming the small box girder;

[0045] Step three, when hydraulically demolding the fully enclosed small box girder inner mold, the left and right demolding frames 10 are controlled by the hydraulic cylinders 12 on both sides arranged on the two movable side plates 2 to drive the two sets of molding inner molds 7 to pass through the demolding holes 20 inside the two demolding side plates 3 for demolding and removal. Since the two sets of molding inner molds 7 are composed of several parts, when demolding the molding inner mold 7, the electric heating wire arranged inside the molding inner mold 7 is used for heating treatment. When demolding, heating treatment is performed to reduce the bonding force between the molding inner mold 7 and the inner wall of the small box girder, thereby achieving rapid demolding.

[0046] In summary, the beneficial effects of the present invention are as follows:

[0047] The forming quality of the small box girder is effectively improved through multiple design details. The forming bottom plate 1, the movable side plate 2, the demoulding side plate 3 and the forming top plate 4 are used to form a closed casting and molding cavity to prevent concrete leakage, ensure the uniform distribution of concrete, and improve the overall molding quality. The limiting block 5 at the bottom of the forming top plate 4 cooperates with the limiting groove 6 at the top of the movable side plate 2 and the demoulding side plate 3 to ensure that the various components are tightly connected and accurately positioned, thereby ensuring the dimensional accuracy and shape regularity of the small box girder; the steel bar positioning holes on the demoulding side plate 3 cooperate with the fixed support frame 16, the movable support frame 17 and the rotating support ring 19 to provide a Accurate positioning can avoid displacement of steel bars during concrete pouring, thereby improving the structural strength and stability of the small box beam; the movable side panels 2, the demoulding side panels 3 and the forming bottom panel 4 are connected by hinges, which can be flexibly opened during demoulding, making the demoulding process smoother and reducing the risk of damage to the structure; the hydraulic cylinder 12 controls the demoulding frame 10 to drive the forming inner mold 7 to be demoulded and removed through the demoulding holes 20 of the demoulding side panels 3; the forming inner mold 7 composed of multiple components can be heated by the internal electric heating wire during demoulding to reduce the bonding force with the inner wall of the small box beam, thereby achieving rapid demoulding, greatly shortening the demoulding time, and improving construction efficiency. At the same time, the components The design is easy to operate. For example, the step-by-step process of laying steel bars is clear and concise, which reduces the difficulty of operation. The detachable demoulding frame 10 and the multi-component forming inner mold 7 are easy to maintain and replace, which improves the convenience and sustainability of construction. By forming a stable overall structure, it can withstand pressure and impact during concrete pouring, and is not easy to deform or displace, ensuring the production quality and safety of small box girders. Components such as the steel bar positioning holes 15 and the rotating support ring 19 provide stable support for the steel bars to prevent the steel bars from shaking or tilting during the laying process, reducing construction safety risks. The precise control of the hydraulic cylinder 12 and the stable structural connection make demoulding The process is more stable and reliable, reducing the possibility of safety accidents caused by unstable demoulding, and ensuring the safety of construction workers. The movable side panels 2, the demoulding side panels 3 and the forming bottom plate 1 are rotatably connected through hinges, which can be flexibly opened as needed during demoulding, providing convenience for demoulding, making the demoulding process smoother, and reducing the risk of damage to the inner mold and concrete structure during demoulding. Through the cooperation of various components, a stable overall structure is formed. During the concrete pouring process, it can withstand the pressure and impact of concrete, and is not prone to deformation or displacement, ensuring the production quality and safety of small box beams;By setting a number of steel bar positioning holes 15 on the two demoulding side plates 3, accurate positioning positions are provided for the steel bars. During the casting and forming process of the small box beam, the position of the steel bars is ensured to be accurate, and the steel bars are prevented from shifting during the concrete pouring process, thereby improving the structural strength and stability of the small box beam. At the same time, the rotating support rings 19 on the fixed support frame 16 and the movable support frame 17 play an auxiliary supporting and positioning role for the steel bars during the laying process. They cooperate with the steel bar positioning holes to provide stable support for the steel bars during the laying process, avoiding the shaking or tilting of the steel bars during the laying process, reducing the safety risks during the construction process, further improving the positioning accuracy of the steel bars, and ensuring the quality of the small box beam. ;

[0048] Meanwhile, the contents not described in detail in this specification belong to the prior art known to those skilled in the art.

[0049] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0050] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A fully enclosed small box beam inner mold hydraulic demoulding device, comprising a forming bottom plate (1), a movable side plate (2), a demoulding side plate (3) and a forming top plate (4), wherein the front and rear sides of the top of the forming bottom plate (1) are both provided with movable side plates (2) by means of hinge rotation, and the left and right sides of the top of the forming bottom plate (1) are both provided with demoulding side plates (3) by means of hinge rotation, and characterized in that: A forming top plate (4) is movably provided on the top of the two movable side plates (2) and the two demoulding side plates (3); a plurality of steel bar positioning holes (15) are provided on opposite sides of the two demoulding side plates (3); a fixed support frame (16) is placed on the top of the forming bottom plate (1); and a flip support side frame (18) is rotatably provided on the front and rear sides of the top of the fixed support frame (16); a movable support frame (17) is movably placed on the top of the two flip support side frames (18); and a plurality of rotating support rings (19) are fixedly provided on opposite sides of the two flip support side frames (18); wherein the rotating support ring (19) is composed of two flexibly rotating annular structures; and a plurality of arc-shaped support frames are provided on the top of the fixed support frame (16) and the movable support frame (17); The two demoulding side plates (3) are each provided with a demoulding hole (20) inside, and a plurality of inner molding molds (7) are provided between opposite sides of the two demoulding side plates (3).

2. The fully enclosed small box beam inner mold hydraulic demoulding device according to claim 1 is characterized in that: Limiting blocks (5) are fixedly arranged around the bottom of the molding top plate (4), and limiting grooves (6) matching with the limiting blocks (5) are arranged on the tops of the two movable side plates (2) and the two demoulding side plates (3), and the bottoms of the four limiting blocks (5) are movably connected to the inside of the four limiting grooves (6) respectively.

3. The fully enclosed small box beam inner mold hydraulic demoulding device according to claim 2 is characterized in that: Two rotatable connecting rods (8) are rotatably provided on one side of two adjacent forming inner molds (7), and connecting thread blocks (9) are fixedly provided on the sides of the forming inner mold (7) located on the far left and the forming inner mold (7) located on the far right that are away from each other, and electric heating wires are provided inside a plurality of the forming inner molds (7).

4. The fully enclosed small box beam inner mold hydraulic demoulding device according to claim 3 is characterized in that: Two hydraulic cylinders (12) are fixedly arranged on the opposite sides of the two movable side plates (2), and a demoulding frame (10) is movably arranged on one side of the two demoulding side plates (3). A connecting threaded hole (11) is arranged on the opposite side of the two demoulding frames (10), and the insides of the two connecting threaded holes (11) are respectively threadedly connected to one end of two connecting threaded blocks (9).

5. The fully enclosed small box beam inner mold hydraulic demoulding device according to claim 4 is characterized in that: The front and rear sides of the two demoulding frames (10) are both provided with connection holes (13), and the driving ends of the two hydraulic cylinders (12) on the left and right sides respectively penetrate the connection holes (13) inside the two demoulding frames (10), and one side of the two demoulding frames (10) is both threadedly provided with two connection nuts (14), and the insides of the four connection nuts (14) are respectively threadedly connected to the driving ends of the four hydraulic cylinders (12).

6. The fully enclosed small box beam inner mold hydraulic demoulding device according to claim 5 is characterized in that: The method for using the fully enclosed small box beam inner mold hydraulic demoulding device comprises the following steps: Step 1: When casting and molding the small box beam, a closed casting and molding cavity is formed by the movable side plates (2) arranged at the front and rear sides of the top of the molding bottom plate (1), the demoulding side plates (3) arranged at the left and right sides, and the molding top plate (4) arranged at the top, and at the same time, the limiting block (5) at the bottom of the molding top plate (4) is matched with the limiting grooves (6) at the top of the movable side plate (2) and the demoulding side plate (3); Step 2: When casting and forming the small box girder, first flip the demoulding side plate (3) arranged on the left side of the top of the forming base plate (1) to a vertical state, pass the left ends of the plurality of steel bars through the fixed support frame (16), the top of the movable support frame (17) and the interior of the plurality of rotating support rings (19), then insert the left ends of the plurality of steel bars into the steel bar positioning holes (15) located inside the left demoulding side plate (3), then flip the demoulding side plate (3) arranged on the right side of the top of the forming base plate (1) to a vertical state, insert the right ends of the plurality of steel bars into the steel bar positioning holes (15) located inside the right demoulding side plate (3), then unlock the plurality of rotating support rings (19), rotate the flip support side frame (18) forward and backward, remove the movable support frame (17) from under the steel bars, and finally remove the fixed support frame (16) from the top of the forming base plate (1), thereby completing the rapid laying of the steel bars for casting and forming the small box girder; Step 3: When hydraulically demolding the fully enclosed small box girder inner mold, the left and right demolding frames (10) are controlled by the hydraulic cylinders (12) on both sides arranged on the two movable side plates (2) to drive the two sets of molding inner molds (7) to pass through the demolding holes (20) inside the two demolding side plates (3) for demolding and removal. Since the two sets of molding inner molds (7) are composed of a plurality of parts, when demolding the molding inner mold (7), the electric heating wire arranged inside the molding inner mold (7) is used for heating treatment. When demolding, the bonding force between the molding inner mold 7 and the inner wall of the small box girder is reduced, thereby achieving rapid demolding.

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