An integral hydraulic demoulding mechanism for the internal formwork of small box girders of concrete highways

Abstract

The present invention relates to the technical field of bridge construction, and provides an integral hydraulic demolding mechanism for the internal formwork of a concrete highway small box girder, which includes a traveling wheel device. The bottom of the internal formwork frame is an internal formwork bottom plate; an opening is provided on the internal formwork bottom plate. The traveling wheel device includes traveling wheels, supports, central shafts, driving devices, stopping devices and following devices; the traveling wheels include a first traveling wheel and a second traveling wheel both rotatably connected to the central shaft; the wheel surfaces of the two have the same shape; the wheel surface includes a cylindrical surface and a chord plane; the first traveling wheel and the second traveling wheel are located on the opening, and the left and right side surfaces of the opening are attached to the adjacent outer side surfaces of the wheels, and the front and rear side surfaces of the opening are arc surfaces that can be attached to the cylindrical surface. This device overcomes the defect that the existing internal formwork of box girders cannot maintain a complete plane for the internal formwork bottom plate due to the use of rollers in the lifting mode, resulting in liquid concrete entering the sunken area and having an adverse impact on subsequent demolding operations after solidification.

Description

Technical Field

[0001] The present invention relates to the technical field of bridge construction, and particularly relates to an integral hydraulic demoulding mechanism for the internal formwork of a concrete highway small box girder. Background Art

[0002] At present, most domestic railway, highway and urban bridges are mainly of reinforced concrete structure. The bridge deck components spanned between two bridge piers are basically fabricated by precast methods. In order to reduce the self-weight of the bridge deck components and save the consumption of concrete, the bridge deck components are made into a hollow shape, and thus are also called concrete box girders. When the concrete box girder is formed by casting with a mould, an external formwork for forming the external shape of the box girder and an internal formwork for forming the hollow cavity of the box girder are required. Since the internal formwork of the box girder involves the problem of demoulding after forming, in order to smoothly demould from the hollow cavity of the box girder, the framework of the internal formwork of the box girder is mostly divided into multiple sub-moulds on its cross-section, and the sub-moulds can be folded and contracted. Then, a traction device is used to pull out the internal formwork of the box girder from one end of the hollow cavity of the concrete box girder.

[0003] For the external surface of the existing internal formwork of the box girder, in order to achieve the appearance of the concrete box girder after forming and facilitate demoulding, its surface generally needs to be smooth. However, when the mould is pulled out, a large amount of power will be consumed due to the sliding friction of its bottom surface, which is not conducive to energy conservation and emission reduction. In order to overcome this problem, if rollers are provided on the bottom plate of the internal formwork, not only will the appearance of the concrete box girder after forming be damaged, but also it will be difficult to pull out because a clamping structure will be formed after the concrete solidifies due to the protrusions on the outer surface of the mould. In order to avoid this problem, some solutions will set the rollers in a liftable mode. However, since the wheel surface of the roller is a cylindrical surface and the bottom plate of the internal formwork is a flat surface, the liftable rollers cannot maintain a complete unified plane with the bottom plate of the internal formwork in the state of being retracted into the bottom plate, and some concave areas and even gaps will be formed between the rollers and the bottom surface of the internal formwork. During pouring, the liquid concrete will enter these places. After solidification, it will not only damage the appearance of the box girder formed, but also form a clamping structure that is not conducive to demoulding. Even the liquid concrete may penetrate into the mould through the gaps and cause the shrinkage components of the mould to be completely stuck after solidification, making the internal formwork unable to shrink and be pulled out normally. Summary of the Invention

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the defect that the bottom plate of the existing internal formwork of the box girder cannot maintain a complete plane due to the use of liftable rollers, resulting in the liquid concrete entering the concave area and having an adverse effect on the subsequent demoulding operation after solidification.

[0005] To solve the above technical problem, the present application provides an integral hydraulic demoulding mechanism for the internal formwork of a concrete highway small box girder, which includes a traveling wheel device arranged at the bottom of a retractable internal formwork framework, and the bottom of the internal formwork framework is an internal formwork bottom plate; an opening is provided on the internal formwork bottom plate;

[0006] The travel wheel device includes a travel wheel, a support, a central shaft, a driving device, a stopping device and a following device; a support is provided at the top of each of the left and right sides of the opening, and the central shaft is provided between the two supports;

[0007] The travel wheel comprises a first travel wheel and a second travel wheel, both of which are rotatably connected to the central axis; the first travel wheel and the second travel wheel are fitted together, the sides of the two sides that are in contact with each other are the inner side surfaces of the wheels, and the sides of the two sides that are opposite to each other are the outer side surfaces of the wheels, and the wheel surfaces of the two wheels have the same shape; the wheel surface comprises a cylindrical surface and a chord plane that intersects the cylindrical surface; the driving device is connected to the first travel wheel; the stopping device is connected to the second travel wheel; the following device is arranged between the first travel wheel and the second travel wheel;

[0008] The first running wheel and the second running wheel are located on the opening, the left and right sides of the opening are fitted with the outer sides of the adjacent wheels, and the front and rear sides of the opening are arc surfaces that can fit with the cylindrical surface;

[0009] When the running wheel device is in the mold state, the chord planes of the first running wheel and the second running wheel are coplanar and flush with the bottom surface of the inner mold bottom plate, so that the bottom surface of the inner mold bottom plate and the two chord planes together form a complete plane; the cylindrical surfaces of the first running wheel and the second running wheel overlap to form a first overlap area;

[0010] When the walking wheel device changes from the mold state to the walking state, the driving device drives the first walking wheel to rotate; the stopping device applies a fixing effect to the second walking wheel; and the following device releases the fixing effect between the first walking wheel and the second walking wheel;

[0011] When the walking wheel device reaches the walking state, the first walking wheel rotates relative to the second walking wheel until the chord planes of the two are completely offset, so that the cylindrical surfaces of the two meet head to tail to form a second overlapping area, and the first overlapping area is shortened accordingly; the stopping device releases the fixing effect of the second walking wheel; the follower device applies a fixing effect between the first walking wheel and the second walking wheel.

[0012] Further, the stopping device comprises a second elastic device, a fourth sliding pin, a third sliding pin and a protrusion;

[0013] The second elastic device is arranged on the support adjacent to the second traveling wheel; the fourth sliding pin is connected to the second elastic device and has a tendency to move towards the outer side surface of the second traveling wheel under the action of elastic force; a third pin hole is penetrated and opened between the two side surfaces of the second traveling wheel, a third sliding pin is arranged in the third pin hole, and a convex block is arranged on the inner side surface of the first traveling wheel; a first sliding groove for accommodating the sliding rotation of the convex block is opened on the inner side surface of the second traveling wheel; the first sliding groove intersects with the third pin hole; the head end of the third sliding pin can form an inclined surface fit with the convex block; the central distance from the fourth sliding pin to the central axis is not greater than the chord distance of the chord plane;

[0014] When the stopping device applies a fixing effect on the second traveling wheel, the fourth sliding pin is aligned with the third pin hole, and the head end of the fourth sliding pin is clamped into the third pin hole; the tail end of the third sliding pin is pushed by the fourth sliding pin, so that the head end of the third sliding pin moves to a position close to the outer side surface of the second traveling wheel;

[0015] When the stopping device releases the fixing effect on the second traveling wheel, the convex block slides to be aligned with the third pin hole, and the convex block squeezes the head end of the third sliding pin to retreat through the inclined surface fit, so that the tail end of the third sliding pin pushes the head end of the fourth sliding pin to retract to a position flush with the outer side surface of the second traveling wheel.

[0016] Furthermore, the driving device includes a power device, a swing arm, a first elastic device and a first sliding pin;

[0017] The power device is in transmission connection with the swing arm; the swing arm is rotationally connected to the central axis; the first elastic device is arranged on the swing arm; the first sliding pin is connected to the first elastic device and has a tendency to move towards the outer side surface of the first traveling wheel under the action of elastic force; a first pin hole is opened on the outer side surface of the first traveling wheel; a first inclined surface is arranged at the head end of the first sliding pin, so that the head end of the first sliding pin forms a tongue-like structure; the first inclined surface faces the side where the first traveling wheel rolls backward; the central distance from the first sliding pin to the central axis is not greater than the chord distance of the chord plane;

[0018] When the driving device drives the first traveling wheel to rotate, the head end of the first sliding pin is aligned with the first pin hole and enters the first pin hole; the end of the first inclined surface protrudes from the outer side surface of the first traveling wheel; the power device drives the first traveling wheel to roll forward through the swing arm and the first sliding pin.

[0019] Furthermore, the elastic force of the first elastic device is stronger than that of the second elastic device; the first pin hole is penetrated and opened between the two side surfaces of the first traveling wheel; the first pin hole is a stepped hole with a first shoulder; a second sliding pin adapted to the shape of the first pin hole is arranged in the first pin hole;

[0020] When the walking wheel device is in the die state, the swing arm rotates to a position where the first sliding pin is misaligned with the first pin hole, and the head end of the first sliding pin retracts beyond the outer side surface of the first walking wheel; the fourth sliding pin, the third sliding pin, and the second sliding pin are aligned with each other; under the elastic force of the second elastic device, the fourth sliding pin pushes the head end of the third sliding pin into and engages with the first pin hole; the head end of the third sliding pin pushes the second sliding pin, so that the head end of the second sliding pin moves to a position close to the outer side surface of the first walking wheel;

[0021] When the walking wheel device changes from the die state to the walking state, the swing arm rotates to a position where the first sliding pin is aligned with the first pin hole, the first sliding pin enters the first pin hole, and under the elastic force of the first elastic device, the first sliding pin pushes the second sliding pin to retract; the second sliding pin drives the third sliding pin and the fourth sliding pin to retract together; when the tail end of the second sliding pin moves to be flush with the inner side surface of the first walking wheel, the first shoulder blocks the retraction of the second sliding pin.

[0022] Further, a baffle is provided on the support near the first walking wheel; the baffle is located on the side facing the first inclined plane; when the walking wheel device is in the die state, the baffle is between the first sliding pin and the first walking wheel, and the baffle blocks a part of the port of the first pin hole, thereby preventing the second sliding pin from sliding out of the first pin hole; when the driving device drives the first walking wheel to rotate, the end of the first inclined plane and the baffle are in the same axial position of the first sliding pin.

[0023] Further, the third pin hole is located at the end of the first chute; when the convex block slides and rotates to be aligned with the third pin hole, the side wall of the convex block abuts against the end face of the first chute.

[0024] Further, the follower device includes a fifth sliding pin and a fourth spring; a fourth pin hole is provided on the inner side surface of the second walking wheel, and a second pin hole is provided on the inner side surface of the first walking wheel; both the second pin hole and the fourth pin hole are blind holes; the fourth spring and the fifth sliding pin are sequentially inserted into the fourth pin hole, and the fourth spring is in a compressed state; the head end of the fifth sliding pin is provided with a second conical surface, and the second pin hole has a shape adapted to the head end of the fifth sliding pin;

[0025] When the walking wheel device is in the die state, the second pin hole and the fourth pin hole are misaligned; when the follower device is in the applied fixed state, the second pin hole and the fourth pin hole rotate to be aligned with each other, and the head end of the fifth sliding pin is snapped into the second pin hole to form an inclined plane fit.

[0026] Further, the central shaft is fixedly connected to the support, and a counterbore is provided on the central shaft; a second chute is provided on the inner side surface of the second walking wheel;

[0027] The follow-up device further includes a slider, a swing claw, a slider reset device, and a swing claw reset device; the slider is slidably connected to the second chute; one end of the swing claw is hinged to the slider; the swing claw reset device is adapted to push the other end of the swing claw into the sinking groove when the other end of the swing claw moves to align with the sinking groove; a second inclined plane is provided on the swing claw; when the second traveling wheel performs a forward rolling motion, the other end of the swing claw can form an inclined plane fit with the sinking groove through the second inclined plane; when the second traveling wheel performs a backward rolling motion, the other end of the swing claw can form an abutting relationship with the sinking groove;

[0028] A bayonet is formed through the slider, and a ring groove is formed in the fifth sliding pin; when the head end of the fifth sliding pin is outside the second pin hole, the bayonet is aligned with the fourth pin hole, and the fifth sliding pin can slide freely in the fourth pin hole; when the head end of the fifth sliding pin is clamped into the second pin hole, the slider reset device drives the slider to slide, so that the bayonet is clamped into the ring groove, thereby preventing the fifth sliding pin from retracting; when the other end of the swing claw abuts against the sinking groove, as the second traveling wheel rolls backward, the swing claw pushes the slider to align the bayonet with the fourth pin hole.

[0029] Further, the bayonet and the fourth pin hole have the same shape. When the head end of the fifth sliding pin is in the retracted state, the fifth sliding pin forms a fixed connection relationship between the slider and the second traveling wheel;

[0030] When the second traveling wheel performs a backward rolling motion to form a fixed connection relationship between the slider and the second traveling wheel, the chord plane of the second traveling wheel and the bottom surface of the inner mold bottom plate form a coplanar relationship.

[0031] Further, the opening of the sinking groove is arranged upward. The swing claw includes a cross bar 49 and a vertical rod that form a T-shaped connection relationship. The second inclined plane is arranged at one end of the vertical rod close to the central axis;

[0032] The slider reset device and the swing claw reset device are the same third spring. The first end of the third spring is connected to the other end of the vertical rod, and the first end of the third spring is connected to the inner wall of the second chute; the distance from the first end of the third spring to the axis of the central axis is not less than the distance from the second end of the third spring to the axis of the central axis.

[0033] By adopting the above technical solutions, the present invention has the following technical effects:

[0034] The integral hydraulic demoulding mechanism for the inner mold of a small concrete highway box girder provided by the present invention is provided with a first running wheel and a second running wheel having a cylindrical surface and a chord plane, which can be relatively rotated and locked, so that when it is in a mold state, the chord planes of the first running wheel and the second running wheel are coplanar and flush with the bottom surface of the inner mold bottom plate, so that the bottom surface of the inner mold bottom plate and the two chord planes together form a complete plane, thereby ensuring that the surface of the box girder after casting is smooth and flat as a whole, avoiding the decline of the appearance quality, and also facilitating the road surface to have a high flatness during subsequent driving. The cylindrical surfaces of the first running wheel and the second running wheel overlap to form a first overlapping area, and because the chord plane and the bottom surface of the inner mold bottom plate become coplanar, the cylindrical surface is necessarily in a position to be attached to the arc surface, so that a fitting seal with the outer side surface of the wheel and the cylindrical surface is formed in the four directions of the opening, thereby preventing the liquid concrete from penetrating into the mold during casting, thereby causing adverse effects.

[0035] When the travel wheel device reaches the walking state through the relative rotation of the first travel wheel and the second travel wheel, the first travel wheel rotates relative to the second travel wheel until the chord planes of the two are completely offset, so that the cylindrical surfaces of the two meet head to tail to form a second overlap area, and the first overlap area is shortened accordingly. The stop device releases the fixing effect on the second travel wheel; the follower device applies a fixing effect between the first travel wheel and the second travel wheel. In this way, the first travel wheel and the second travel wheel form an integral wheel. Because there is always a cylindrical surface in the 360° range of the wheel body rolling, the wheel can still play the function of a complete round wheel during the rolling process, so that the plane sliding friction of the inner mold demoulding can be changed into the rolling friction of the wheel body, which increases and reduces the requirements for pulling force, which is beneficial to reducing the energy consumption of the power equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0037] Figure 1 A schematic cross-sectional view of the structure in which the travel wheel device of an embodiment of the present invention is installed in the inner mold frame;

[0038] Figure 2 It is a schematic three-dimensional diagram of the structure of the travel wheel device of an embodiment of the present invention in a mold state from a first viewing angle;

[0039] Figure 3 A schematic perspective view of the structure of the travel wheel device of an embodiment of the present invention in a mold state from a second viewing angle;

[0040] Figure 4 Schematic perspective view of the support and the inner mold bottom plate according to an embodiment of the present invention;

[0041] Figure 5 Schematic perspective view of the first traveling wheel according to an embodiment of the present invention;

[0042] Figure 6 Schematic perspective view of the second traveling wheel according to an embodiment of the present invention;

[0043] Figure 7 Schematic side view of the traveling wheel device according to an embodiment of the present invention when the swing arm rotates to align the first sliding pin with the first pin hole;

[0044] Figure 8 Schematic side view of the traveling wheel device according to an embodiment of the present invention after the swing arm rotates to make the cylindrical surface of the first traveling wheel touch the ground;

[0045] Figure 9 Schematic perspective view of the traveling wheel in the traveling state according to an embodiment of the present invention;

[0046] Figure 10 is Figure 7 The cross-sectional view taken along line A-A in

[0047] Figure 11 is Figure 7 The cross-sectional view taken along line B-B in

[0048] Figure 12 Schematic cross-sectional view of the traveling wheel device according to an embodiment of the present invention in the traveling wheel locked state;

[0049] Figure 13 Schematic cross-sectional view of the traveling wheel device according to an embodiment of the present invention in the traveling wheel fully unlocked state;

[0050] Figure 14 Schematic perspective view of the mating relationship structure of the second traveling wheel, the central shaft, the swing claw, the slider and the fifth sliding pin according to an embodiment of the present invention;

[0051] Figure 15 Schematic perspective view of the swing claw, the slider and the fifth sliding pin according to an embodiment of the present invention;

[0052] Figure 16 Schematic exploded view of the traveling wheel device according to an embodiment of the present invention from the first perspective;

[0053] Figure 17 Schematic exploded view of the traveling wheel device according to an embodiment of the present invention from the second perspective.

[0054] Explanation of reference numerals:

[0055] 1 - Inner mold frame, 2 - Traveling wheel device, 3 - Second elastic device, 4 - Second traveling wheel, 5 - First traveling wheel, 6 - Outer wheel surface, 7 - Swing arm, 8 - First elastic device, 9 - Central axis, 10 - Support, 11 - Inner mold bottom plate, 12 - Chord plane, 13 - Vertical guard plate, 14 - Elastic device mounting seat, 15 - Arc surface, 16 - Baffle, 17 - Cylindrical surface, 18 - First pin hole, 19 - Second pin hole, 20 - Inner wheel surface, 21 - Protrusion, 22 - Fourth pin hole, 23 - Second chute, 24 - Third pin hole, 25 - First chute, 26 - First coincidence area, 27 - Second coincidence area, 28 - Second sliding pin, 29 - First inclined plane, 30 - First sliding pin, 31 - First spring, 32 - Fourth sliding pin, 33 - Third sliding pin, 34 - First conical surface, 35 - First shoulder, 36 - Second shoulder, 37 - Second spring, 38 - Fifth sliding pin, 39 - Slide block, 40 - Swing claw, 41 - Third spring, 42 - Sunk groove, 43 - Bayonet, 44 - Second conical surface, 45 - Ring groove, 46 - Spring connection hole, 47 - Vertical rod, 48 - Second inclined plane, 49 - Cross bar, 50 - Opening. Detailed implementation mode

[0056] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of them. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0057] In the description of the present invention, it should be noted that the coordinate system adopted in this specification when describing the orientation is determined by the moving direction of the inner mold when demolding and pulling out, and the viewing angle naming of the corresponding views is also based on this. Therefore, the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. in this specification indicate the orientation or position relationship based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention.

[0058] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0059] In addition, the technical features involved in different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0060] This embodiment provides an integral hydraulic demoulding mechanism for the internal formwork of a concrete highway small box girder. In one embodiment, as Figures 1 to 17 shown, it includes a traveling wheel device 2 provided at the bottom of the internal formwork frame 1. The internal formwork frame 1 should be foldable and retractable to facilitate demoulding. The bottom of the internal formwork frame 1 is the internal formwork bottom plate 11; as Figure 2 shown, an opening 50 is provided on the internal formwork bottom plate 11.

[0061] The traveling wheel device 2 is as Figure 2 , 3 , 16 and 17 shown, and it includes traveling wheels, supports 10, a central shaft 9, a driving device, a stopping device and a following device; one support 10 is provided at the top of each of the left and right side surfaces of the opening 50, and the central shaft 9 is passed through between the two supports 10.

[0062] The traveling wheels include a first traveling wheel 5 and a second traveling wheel 4 both rotatably connected to the central shaft 9. The first traveling wheel 5 and the second traveling wheel 4 are in contact with each other. The side surfaces in contact with each other are the inner wheel side surfaces 20, and the side surfaces facing away from each other are the outer wheel side surfaces 6. Their wheel surfaces have the same shape. The wheel surface includes a cylindrical surface 17 and a chord plane 12 intersecting with the cylindrical surface 17. The meaning of the chord plane 12 can be referred to Figure 5 and 6 , that is, when viewed from the side of the wheel body, the chord plane 12 is like a chord in a circle, cutting out a straight section from the originally complete circle. The driving device is connected to the first traveling wheel 5; the stopping device is connected to the second traveling wheel 4; the following device is arranged between the first traveling wheel 5 and the second traveling wheel 4.

[0063] As Figures 2 to 4 shown, the first traveling wheel 5 and the second traveling wheel 4 are located on the opening 50. The left and right side surfaces of the opening 50 are in contact with the adjacent outer wheel side surfaces 6, and the front and back side surfaces of the opening 50 are arc surfaces 15 that can be in contact with the cylindrical surface 17.

[0064] When the walking wheel device 2 is in the mold state, the chord planes 12 of both the first walking wheel 5 and the second walking wheel 4 are coplanar and flush with the bottom surface of the inner mold bottom plate 11, so that the bottom surface of the inner mold bottom plate 11 and the two chord planes 12 together form a complete plane. Therefore, it can ensure that the surface of the cast box girder is integrally smooth and flat, avoid the decline of appearance quality, and is also beneficial to the high flatness of the road surface during subsequent walking. The cylindrical surfaces 17 of the first walking wheel 5 and the second walking wheel 4 coincide with each other to form the first coincidence area 26. After the chord plane 12 and the bottom surface of the inner mold bottom plate 11 form a coplanar surface, its cylindrical surface 17 must be in a position where it is in contact with the arc surface 15. Therefore, a fitting seal with the outer wheel side surface 6 and the cylindrical surface 17 is formed in all four directions of the opening 50, thereby preventing liquid concrete from seeping into the mold during pouring and causing adverse effects.

[0065] And in order to further improve the sealing effect, it can also be as Figure 4 shown, make the side wall of the support 10 coplanar with the side wall of the corresponding opening 50, so that in addition to fitting and sealing with the side wall of the opening 50, the outer wheel side surface 6 can also form a larger area of fitting and sealing area with the side wall of the support 10. In addition, vertical guard plates 13 can be added to the front and rear sides of the opening 50, and the arc surface 15 can be extended to the vertical guard plates 13, thereby increasing the mating surface with the cylindrical surface 17.

[0066] When the walking wheel device 2 changes from the mold state to the walking state, the driving device drives the first walking wheel 5 to rotate. The stopping device applies a fixing effect on the second walking wheel 4 to prevent the second walking wheel 4 from rotating together with the first walking wheel 5. The stopping device can adopt the form of friction braking or can also adopt a clamping mechanism to prevent the second walking wheel 4 from rotating. The following device releases the fixing effect between the first walking wheel 5 and the second walking wheel 4. The simplest form of the following device can use a friction gasket between the two wheels, so that the two wheels can be rotated under an external force, and the positions of the two wheels can be fixed after the external force is withdrawn; and in order to meet other functions, a more complex form can also be adopted, which will be discussed in the following content. Finally, with the cooperation of the above several devices, the walking wheel device 2 can reach Figure 8 the state shown, at this time only the first walking wheel 5 will rotate, and this rotation should preferably be a forward rolling movement for the convenience of subsequent demolding. After forward rolling, its cylindrical surface 17 will reach the lowest point of the device and contact the ground. At this time, the second walking wheel 4 will still be in a fixed state and form a relative rotation with the first walking wheel 5.

[0067] After that, when the walking wheel device 2 reaches the final walking state, it can be seen in Figure 9As shown, the first running wheel 5 rotates relative to the second running wheel 4 until the chord planes 12 of the two are completely offset, so that the cylindrical surfaces 17 of the two meet head to tail to form a second overlap area 27, and the first overlap area 26 is shortened accordingly. The stopper releases the fixing effect on the second running wheel 4; the follower applies a fixing effect between the first running wheel 5 and the second running wheel 4. In this way, the first running wheel 5 and the second running wheel 4 form an integral wheel. Although the wheel has defects in some parts, namely where the chord plane 12 is located, because there is always a section of cylindrical surface 17 in the 360° range of wheel body rolling, it can still play the function of a complete round wheel during the rolling process, so that the plane sliding friction for demoulding the inner mold can be changed into the rolling friction of the wheel body, which increases and reduces the requirements for pulling force, which is beneficial to reducing the energy consumption of the power equipment.

[0068] Based on the above implementation, in a preferred implementation, Figure 5 and 13 As shown, the stopping device comprises a second elastic device 3 , a fourth sliding pin 32 , a third sliding pin 33 and a protrusion 21 .

[0069] The second elastic device 3 is arranged on the support 10 adjacent to the second running wheel 4 through the elastic device mounting seat 14. Figure 11 As shown, the fourth sliding pin 32 is connected to the second elastic device 3 and has a tendency to move toward the outer side surface 6 of the second running wheel 4 under the elastic force of the second spring 37 therein. A third pin hole 24 is provided between the two side surfaces of the second running wheel 4, and the third sliding pin 33 is provided in the third pin hole 24. Figure 5 As shown, it is arranged on the inner side 20 of the first running wheel 5. Figure 6 As shown, a first slide groove 25 for accommodating the sliding of the protrusion 21 is provided on the inner side surface 20 of the second running wheel 4. The first slide groove 25 intersects with the third pin hole 24. The head end of the third sliding pin 33 can form an inclined surface match with the protrusion 21 through the first conical surface 34. The inclined surface match means that there is at least one contact surface with a slope in the contact position of the two parts, so that after the two parts are squeezed against each other through the slope surface, the driven part can move in a different direction from the driving part.

[0070] In addition, in order to ensure that the fourth sliding pin 32 does not fall out when it moves to the chord plane 12, the center distance between the fourth sliding pin 32 and the central axis 9 is not greater than the chord center distance of the chord plane 12, that is, the distance between the chord plane 12 and the wheel body axis. In this way, after the fourth sliding pin 32 is retracted, the wheel outer side surface 6 can always abut against the fourth sliding pin 32.

[0071] When the stopper exerts a fixing effect on the second running wheel 4, as shown in FIG. Figure 11As shown, the fourth sliding pin 32 is aligned with the third pin hole 24, and the head end of the fourth sliding pin 32 is inserted into the third pin hole 24; the tail end of the third sliding pin 33 is pushed by the fourth sliding pin 32, so that the head end of the third sliding pin 33 moves close to the outer side surface 6 of the second walking wheel 4.

[0072] When the locking device releases the fixing effect on the second running wheel 4, as shown in FIG. Figure 13 As shown, the protrusion 21 slides to align with the third pin hole 24, and the protrusion 21 squeezes the head end of the third sliding pin 33 to retreat through the inclined surface, so that the tail end of the third sliding pin 33 pushes the head end of the fourth sliding pin 32 to retract to be flush with the outer side surface 6 of the second running wheel 4.

[0073] In addition to the above-mentioned clamping form, the stopper can also be a friction fixing form such as a brake. However, the above-mentioned structure is preferably used in this embodiment because, firstly, it can reduce the number of additional power devices compared to the friction brake, reduce the cost and simplify the control. Secondly, the clamping form of the stopper can make the position of the second running wheel 4 clear after being fixed, so that it can be fixed after the chord plane 12 is exactly coplanar with the inner mold bottom plate 11, ensuring that a reliable unified plane can be formed in the mold state. Based on this position certainty, this embodiment preferably has a protrusion 21 on the first running wheel 5, and through the third sliding pin 33 that passes through the second running wheel 4, the fourth sliding pin 32 is remotely unlocked at intervals. This arrangement is to unlock the fourth sliding pin 32 only after the first running wheel 5 rotates to a suitable position, that is, a position where the chord planes 12 are staggered with each other, so that the second running wheel 4 and the first running wheel 5 after release form a suitable relative position.

[0074] Based on the above implementation, in a preferred implementation, Figure 7 and 10 As shown, the driving device includes a power device, a swing arm 7, a first elastic device 8 and a first sliding pin 30.

[0075] The power device is drivingly connected to the swing arm 7; the power device preferably uses a hydraulic cylinder, but if conditions permit, a hydraulic motor or even an electric motor and other power devices can also be used. The swing arm 7 is rotatably connected to the central shaft 9. The first elastic device 8 is arranged on the swing arm 7. The first sliding pin 30 is connected to the first elastic device 8 and has a tendency to move towards the outer side surface 6 of the first traveling wheel 5 under the elastic force of the first spring 31 therein. A first pin hole 18 is formed in the outer side surface 6 of the first traveling wheel 5; a first inclined surface 29 is arranged at the head end of the first sliding pin 30, so that the head end of the first sliding pin 30 forms a tongue-like structure. The first inclined surface 29 faces the side where the first traveling wheel 5 rolls backward, so that the first sliding pin 30 can form a limiting ability for the one-way rotation of the first traveling wheel 5. Only when the swing arm 7 rotates in the direction of rolling forward towards the first traveling wheel 5, can the first traveling wheel 5 be driven to rotate. Otherwise, when the swing arm 7 has a relative backward rotation tendency, the first sliding pin 30 will retract and will not hinder the relative forward rolling of the first traveling wheel 5. In order to ensure that the first inclined surface 29 always maintains its due orientation, a sliding key can be arranged between the first sliding pin 30 and the hole with which it cooperates. In addition, also in order to prevent the first sliding pin 30 from coming out, the center distance from the first sliding pin 30 to the central shaft 9 is not greater than the chord center distance of the chord plane 12.

[0076] When the driving device drives the first traveling wheel 5 to rotate, as Figure 10 and 11 shown, after the head end of the first sliding pin 30 is aligned with the first pin hole 18, it enters the first pin hole 18, and the power device drives the first traveling wheel 5 to roll forward through the swing arm 7 and the first sliding pin 30. At this time, the end of the first inclined surface 29 protrudes from the outer side surface 6 of the first traveling wheel 5 to ensure that after the swing arm 7 runs to the maximum stroke, the first traveling wheel 5 can continue to roll forward without being hindered.

[0077] This driving scheme that uses the swing arm 7 to drive the first traveling wheel 5 unidirectionally and only acts for a certain distance has advantages such as lower cost and space saving compared with the scheme of setting a motor for continuous driving. Specifically, because the internal space is very compact after the entire inner mold is folded and contracted, it is necessary to avoid adding components with a large volume. The driving scheme of the swing arm 7 cooperating with a hydraulic cylinder that only acts for a certain distance, especially when the traveling wheel and the hydraulic cylinder are arranged along the axis direction of the inner mold frame 1, can only occupy a very small part of the space in the cross-section of the inner mold and will not increase the difficulty of minimizing the inner mold due to adding components. Moreover, when the inner mold is demolded, there will be a traction device for pulling, and it is not necessary to always maintain its own driving force. It only needs the hydraulic cylinder to swing the swing arm 7 until the cylindrical surface 17 of the first traveling wheel 5 touches the ground, that is, Figure 8 after the state, the driving force can be withdrawn, and then rely on the external traction device to drive the relevant wheel bodies to rotate.

[0078] Based on the above implementation, in a preferred implementation, Figure 11 and 12 As shown, the elastic force of the first elastic device 8 is stronger than the elastic force of the second elastic device 3; the first pin hole 18 is through-opened between the two side surfaces of the first walking wheel 5; the first pin hole 18 is a stepped hole with a first shoulder 35; a second sliding pin 28 matching the shape of the first pin hole 18 is penetrated in the first pin hole 18.

[0079] When the walking wheel device 2 is in the mold state, the swing arm 7 rotates to a position where the first sliding pin 30 is misaligned with the first pin hole 18, for example, when the hydraulic cylinder is pulled back to the minimum stroke, the swing arm 7 is in a relatively rearmost position. Figure 12 As shown, the head end of the first sliding pin 30 is retracted to the outside of the wheel outer side 6 of the first running wheel 5; the fourth sliding pin 32, the third sliding pin 33 and the second sliding pin 28 are aligned with each other. Under the elastic force of the second elastic device 3, the fourth sliding pin 32 pushes the head end of the third sliding pin 33 to enter and be clamped in the first pin hole 18; the head end of the third sliding pin 33 pushes the second sliding pin 28, so that the head end of the second sliding pin 28 moves close to the wheel outer side 6 of the first running wheel 5.

[0080] When the walking wheel device 2 changes from the mold state to the walking state, the swing arm 7 rotates to align the first sliding pin 30 with the first pin hole 18. For example, the hydraulic cylinder slightly pushes forward to cause the swing arm 7 to swing forward. Figure 11 As shown, the first sliding pin 30 enters the first pin hole 18, and under the elastic force of the first elastic device 8, the first sliding pin 30 pushes the second sliding pin 28 to retreat; the second sliding pin 28 drives the third sliding pin 33 and the fourth sliding pin 32 to retreat together; when the tail end of the second sliding pin 28 moves to be flush with the inner side surface 20 of the first running wheel 5, the first shoulder 35 blocks the retreat of the second sliding pin 28. In order to achieve the third sliding pin 33 retreat with accuracy and prevent its tail from protruding from the outer side surface 6 of the wheel, a corresponding second shoulder 36 can also be set in the third pin hole 24 for limiting.

[0081] After the above settings, when the second walking wheel 4 is in the locked state, the first walking wheel 5 can also be locked by the third sliding pin 33 that is pushed out, so that the entire walking wheel is in the locked state, ensuring that the chord planes 12 of the two wheels are coplanar and always maintained flush with the ground of the inner mold bottom plate 11. This avoids the deflection of the chord planes 12 of the two wheels due to factors such as vibrations during the operation of the entire equipment or accidental bumps during handling operations, which may affect the molding quality of the mold. When the equipment needs to be changed to the walking state, only the swing arm 7 needs to be swung forward in place. Since the elastic force of the first elastic device 8 is stronger than that of the second elastic device 3 and in cooperation with the limiting effect of the first shoulder 35, the first sliding pin 30 can push the second sliding pin 28, and then drive the third sliding pin 33 to retract its head end to the inner side surface 20 between the two wheels by itself, thus unlocking the lock between the two wheels and then realizing the relative rotation between the two wheels. The entire process does not require the participation of a complex control system, reducing the equipment cost and the equipment has a very simple structure.

[0082] Based on the above embodiments, in a preferred embodiment, as Figure 4 、 8 and 10 show, a baffle 16 is provided on the support 10 adjacent to the first walking wheel 5. The baffle 16 is located on the side facing the first inclined plane 29. When the walking wheel device 2 is in the mold state, as can be seen in Figure 10 shown, the baffle 16 is between the first sliding pin 30 and the first walking wheel 5, and the baffle 16 blocks a part of the port of the first pin hole 18, thus preventing the second sliding pin 28 from sliding out of the first pin hole 18. When the driving device drives the first walking wheel 5 to rotate, the end of the first inclined plane 29 is at the same axial position of the baffle 16 as the first sliding pin 30, so that after the swing arm 7 swings back, the first inclined plane 29 can form an inclined plane fit with the baffle 16.

[0083] The above-mentioned baffle 16 has two functions. One is that after the swing arm 7 swings and coincides with it, the first sliding pin 30 can be retracted under the action of the inclined plane fit and always maintained. In this way, during the continuous rolling of the walking wheel after being pulled by an external traction device, it can be avoided that the first sliding pin 30 continuously aligns with the first pin hole 18 and then pops in and out, reducing component wear. The second is to block the protrusion of the second sliding pin 28. When the first walking wheel 5 is locked by the third sliding pin 33, the second sliding pin 28 may protrude its head end out of the outer side surface 6 of the first walking wheel 5 under the pushing and impact force of the third sliding pin 33, which may then block the subsequent wheel body from continuing to operate. After setting the baffle 16, even if as Figure 10 shown only a small part of the first pin hole 18 is blocked, it can also prevent the second sliding pin 28 from protruding.

[0084] Based on the above embodiments, in a preferred embodiment, asFigure 6 As shown, the third pin hole 24 is located at the end of the first sliding groove 25; when the convex block 21 rotates to align with the third pin hole 24, the side wall of the convex block 21 abuts against the end face of the first sliding groove 25. Since the moment when the convex block 21 rotates to align with the third pin hole 24 is the unlocking moment of the second traveling wheel 4, after the above settings, as the first traveling wheel 5 rotates, the convex block 21 can abut against the end face of the first sliding groove 25 after unlocking the second traveling wheel 4, and then drive the second traveling wheel 4 and the first traveling wheel 5 to move forward together. In this process, the convex block 21 not only becomes a transmission component of the driving force, but also restricts the second traveling wheel 4 from retreating relative to the first traveling wheel 5, which also plays a function of fixing the relative position of the two wheels by the follow-up device to a certain extent and can be used as a follow-up device in some cases to simplify the equipment structure.

[0085] Based on the above embodiments, in a preferred embodiment, as Figure 5 、 6 and 15 show, the follow-up device includes a fifth sliding pin 38 and a fourth spring; a fourth pin hole 22 is formed on the inner side surface 20 of the second traveling wheel 4, and a second pin hole 19 is formed on the inner side surface 20 of the first traveling wheel 5; both the second pin hole 19 and the fourth pin hole 22 are blind holes; the fourth spring and the fifth sliding pin 38 are sequentially inserted into the fourth pin hole 22, and the fourth spring is in a compressed state; a second conical surface 44 is provided at the head end of the fifth sliding pin 38, and the second pin hole 19 has a shape adapted to the head end of the fifth sliding pin 38.

[0086] When the traveling wheel device 2 is in the die state, the second pin hole 19 and the fourth pin hole 22 are misaligned with each other; when the follow-up device is in the applied fixed state, the second pin hole 19 and the fourth pin hole 22 rotate to align with each other, and the head end of the fifth sliding pin 38 is snapped into the second pin hole 19 to form a bevel surface fit, so that the head end of the fifth sliding pin 38 can still be pressed back into the fourth pin hole 22 when unlocking is required.

[0087] Although it is mentioned above that the bump 21 and the first chute 25 can be used as a follower device, this solution can only limit the relative backward movement of the second traveling wheel 4. In some cases, such as when the device vibrates or the first traveling wheel 5 slips, the second traveling wheel 4 will roll forward relative to the first traveling wheel 5, and the bump 21 cannot provide a limit. After setting up a follower device with a fifth sliding pin 38, a blocking force can be provided in both directions of the relative forward and backward rolling of the second traveling wheel 4, so that the two wheels maintain a definite positional relationship. And if a follower device with a fifth sliding pin 38 is set up, it is still preferable to adopt the solution of using the bump 21 and the first chute 25 to limit the relative backward movement of the second traveling wheel 4. Because when the second traveling wheel 4 is initially unlocked and about to rotate, since the chord plane 12 needs to separate from the solidified concrete, there may be some concrete in the small gaps between the components. At this time, the operating resistance faced by the second traveling wheel 4 will be relatively large. And the bump 21, as a reliable force - transmitting component, can jointly apply a rotational force to the second traveling wheel 4 with the fifth sliding pin 38, and finally enable the first traveling wheel 5 to effectively drive the second traveling wheel 4 to rotate together.

[0088] Based on the above - mentioned embodiment, in a preferred embodiment, as Figure 14 and 15 shown, the central shaft 9 is fixedly connected to the support 10, and a sunk groove 42 is provided on the central shaft 9; a second chute 23 is provided on the inner side surface 20 of the second traveling wheel 4.

[0089] The follower device further includes a slider 39, a swing claw 40, a slider reset device, and a swing claw reset device; the slider 39 is slidably connected to the second chute 23; one end of the swing claw 40 is hinged to the slider 39; the swing claw reset device is adapted to push the other end of the swing claw 40 into the sunk groove 42 when the other end of the swing claw 40 moves to align with the sunk groove 42; a second inclined surface 48 is provided on the swing claw 40; when the second traveling wheel 4 performs a forward - rolling motion, the other end of the swing claw 40 can form an inclined - surface fit with the sunk groove 42 through the second inclined surface 48; when the second traveling wheel 4 performs a backward - rolling motion, the other end of the swing claw 40 can form an abutting relationship with the sunk groove 42.

[0090] A bayonet 43 is provided through the slider 39, and an annular groove 45 is provided on the fifth sliding pin 38; when the head end of the fifth sliding pin 38 is outside the second pin hole 19, the bayonet 43 is aligned with the fourth pin hole 22, and the fifth sliding pin 38 can slide freely in the fourth pin hole 22; when the head end of the fifth sliding pin 38 is snapped into the second pin hole 19, the slider reset device drives the slider 39 to slide, so that the bayonet 43 is snapped into the annular groove 45, thereby preventing the fifth sliding pin 38 from retracting; when the other end of the swing claw 40 abuts against the sunk groove 42, as the second traveling wheel 4 rolls backward, the swing claw 40 pushes the slider 39 to align the bayonet 43 with the fourth pin hole 22.

[0091] In the previous embodiment, since the head end of the fifth sliding pin 38 and the second pin hole 19 are in an inclined surface fit, although the fifth sliding pin 38 is always under the action of elastic force, it still has the ability to retract. In some extreme cases, such as in the case of continuous vibration and uneven forces on the two wheels all the time, it is possible that the fifth sliding pin 38 continuously makes small retractions and then completely retracts, which can cause the unlocking of the relative positions of the two wheels, and further align the two chord planes 12, and finally the wheel body returns to a non-complete circular and non-rollable form. After adding the slider 39 with the bayonet 43 and opening the annular groove 45 on the fifth sliding pin 38, when the fifth sliding pin 38 is in the extended locked state, the slider 39 can hold and stop the fifth sliding pin 38, forming a very stable lock between the two wheels. When it is necessary to unlock the two wheels, the second walking wheel 4 needs to retract, that is, roll backward. Since the central shaft 9 does not rotate, when the swing claw 40 abuts against the sunk groove 42, it will push the slider 39, and then the bayonet 43 is in the unlocked position, allowing the fifth sliding pin 38 to retract to unlock the two wheels. The reason why this embodiment has high reliability is that the second walking wheel 4 can only unlock the fifth sliding pin 38 by actually rolling backward. When the second walking wheel 4 only rotates backward relative to the first walking wheel 5 and is still actually rolling forward, the unlocking will not be triggered. During the demolding process of the entire inner mold, it is dragged by the traction device and always moves in one direction. The second walking wheel 4 will only perform forward rolling motion during this process and will never perform backward rolling motion. If backward rolling motion occurs, it can only be deliberately implemented by humans, such as after pulling out the entire inner mold from the box girder, deliberately pushing the entire inner mold backward to unlock the two wheels.

[0092] Based on the above embodiment, in a preferred embodiment, as Figure 14 and 15 shown, the bayonet 43 has the same shape as the fourth pin hole 22. When the head end of the fifth sliding pin 38 is in the retracted state, the fifth sliding pin 38 makes the slider 39 and the second walking wheel 4 form a fixed connection relationship.

[0093] When the second walking wheel 4 performs a backward rolling motion and makes the slider 39 and the second walking wheel 4 form a fixed connection relationship, the chord plane 12 of the second walking wheel 4 and the bottom surface of the inner mold bottom plate 11 form a coplanar relationship.

[0094] As just mentioned above, after setting up mechanisms such as the above slider 39 and pawl 40, to unlock the two wheels, it is necessary to deliberately push the entire inner mold backward. After the two wheels are successfully unlocked, due to the retraction of the fifth sliding pin 38, the bayonet 43 with the same shape is clamped with the fourth pin hole 22, which can overcome the reset effect of the slider reset device and keep the second traveling wheel 4 still in the position after the two wheels are unlocked. At this time, if the second traveling wheel 4 is exactly located at the position where the chord plane 12 and the bottom surface of the inner mold bottom plate 11 form a coplanar relationship, that is, the solution adopted in this embodiment, the second traveling wheel 4 can be reset to the initial position in the mold state while unlocking the two wheels. If the inner mold is continuously pushed backward at this time, the first traveling wheel 5 will roll backward alone until its chord plane 12 starts to touch the ground and crosses the wheel pressure point. Then, under the pressing action of the gravity of the inner mold, the two chord planes 12 will be reset to a coplanar relationship and be flush with the bottom surface of the inner mold bottom plate 11. And at this time, because the stop device and other components are also aligned with their docking holes, the second traveling wheel 4 and even the first traveling wheel 5 will be locked together, making the entire traveling wheel device finally return to the locked mold state and waiting for the next use, which facilitates the debugging and adjustment operations for the equipment to be put into production again.

[0095] Based on the above embodiment, in a preferred embodiment, as Figure 14 and 15 shown, the opening of the sunk groove 42 is arranged upward. The pawl 40 includes a cross bar 49 and a vertical bar 47 that form a T-shaped connection relationship. The second inclined plane 48 is arranged at one end of the vertical bar 47 close to the central axis 9. Such a setting can make the center of gravity of the pawl 40 close to the swinging end and use gravity to achieve reset, reduce the dependence on the pawl reset device, and improve the operation reliability of the equipment.

[0096] The slider reset device and the pawl reset device can preferably be the same third spring 41. The third spring 41 is a tension spring. The first end of the third spring 41 is connected to the other end of the vertical bar 47, and the first end of the third spring 41 is connected to the inner wall of the second chute 23. The distance from the first end of the third spring 41 to the axis of the central axis 9 is not less than the distance from the second end of the third spring 41 to the axis of the central axis 9. That is to say, the first end of the third spring 41 is pulled at the high point of the vertical bar 47 through the spring connection hole 46, while the second end of the third spring 41 is fixed at a relatively low point. As can be seen from Figure 14 shown, at this time, the third spring 41 forms an obliquely downward pulling force on the pawl 40, which not only provides a downward driving force for the reset of the pawl 40 but also provides a retracting force for the slider 39 to reposition, so that the two devices of the slider reset device and the pawl reset device can be simplified into one component, making the device structure more compact, especially conducive to the miniaturization of the device, and meeting the layout requirements of the internal tight space after the inner mold shrinks.

[0097] Obviously, the above embodiments are merely examples given for clear illustration and are not limitations on the implementation manners. For those of ordinary skill in the art, based on the above description, other different forms of changes or modifications can be made. It is not necessary and impossible to list all implementation manners here. And the obvious changes or modifications derived therefrom still fall within the protection scope of the present invention.

Claims

1. An integral hydraulic demoulding mechanism for the internal formwork of small box girders of concrete roads, characterized in that, It comprises a walking wheel device (2) arranged at the bottom of a retractable inner mold frame (1); the bottom of the inner mold frame (1) is an inner mold bottom plate (11); an opening (50) is provided on the inner mold bottom plate (11); The travel wheel device (2) comprises a travel wheel, a support (10), a central shaft (9), a driving device, a stopping device and a following device; the support (10) is provided at the top of each of the left and right sides of the opening (50), and the central shaft (9) is passed through the two supports (10); The travel wheel comprises a first travel wheel (5) and a second travel wheel (4) both of which are rotatably connected to the central shaft (9); the first travel wheel (5) and the second travel wheel (4) are fitted together, the sides of the first travel wheel (5) and the second travel wheel (4) being fitted together, the sides of the first travel wheel (5) and the sides of the second travel wheel (4) being fitted together, the sides of the first travel wheel (5) and the sides of the second travel wheel (4) being fitted together, and the wheel surfaces of the first and second travel wheels having the same shape; the wheel surfaces comprise a cylindrical surface (17) and a chordal plane (12) intersecting the cylindrical surface (17); the driving device is connected to the first travel wheel (5); the stopping device is connected to the second travel wheel (4); the following device is arranged between the first travel wheel (5) and the second travel wheel (4); The first running wheel (5) and the second running wheel (4) are located on the opening (50), the left and right side surfaces of the opening (50) are in contact with the outer side surfaces (6) of the adjacent wheels, and the front and rear side surfaces of the opening (50) are arc surfaces (15) that can be in contact with the cylindrical surface (17); When the running wheel device (2) is in a mold state, the chord planes (12) of the first running wheel (5) and the second running wheel (4) are coplanar and flush with the bottom surface of the inner mold bottom plate (11), so that the bottom surface of the inner mold bottom plate (11) and the two chord planes (12) together form a complete plane; the cylindrical surfaces (17) of the first running wheel (5) and the second running wheel (4) overlap to form a first overlap area (26); When the walking wheel device (2) changes from the mold state to the walking state, the driving device drives the first walking wheel (5) to rotate; the stopping device applies a fixing effect to the second walking wheel (4); and the following device releases the fixing effect between the first walking wheel (5) and the second walking wheel (4); When the running wheel device (2) reaches the running state, the first running wheel (5) rotates relative to the second running wheel (4) until the chord planes (12) of the two are completely offset, so that the cylindrical surfaces (17) of the two meet head to tail to form a second overlapping area (27), and the first overlapping area (26) is shortened accordingly; the stop device releases the fixing effect on the second running wheel (4); and the follower device applies a fixing effect between the first running wheel (5) and the second running wheel (4).

2. The integral hydraulic demoulding mechanism for the internal formwork of small box girders of concrete roads according to claim 1, wherein, The stopping device comprises a second elastic device (3), a fourth sliding pin (32), a third sliding pin (33) and a protrusion (21); The second elastic device (3) is arranged on the support (10) adjacent to the second traveling wheel (4); the fourth sliding pin (32) is connected to the second elastic device (3) and has a tendency to move towards the inner side surface (20) of the second traveling wheel (4) under the action of elastic force; a third pin hole (24) is penetrated and opened between the two side surfaces of the second traveling wheel (4), the third sliding pin (33) is arranged in the third pin hole (24), and a convex block (21) is arranged on the inner side surface (20) of the first traveling wheel (5); a first sliding groove (25) capable of accommodating the sliding rotation of the convex block (21) is opened on the inner side surface (20) of the second traveling wheel (4); the first sliding groove (25) intersects with the third pin hole (24); the head end of the third sliding pin (33) can form an inclined surface fit with the convex block (21); the central distance from the fourth sliding pin (32) to the central axis (9) is not greater than the chord distance of the chord plane (12). When the stopping device applies a fixing action to the second traveling wheel (4), the fourth sliding pin (32) is aligned with the third pin hole (24), and the head end of the fourth sliding pin (32) is clamped into the third pin hole (24); the tail end of the third sliding pin (33) is pushed by the fourth sliding pin (32), so that the head end of the third sliding pin (33) moves to a position close to the outer side surface (6) of the second traveling wheel (4). When the stopping device releases the fixing action on the second traveling wheel (4), the convex block (21) slides to be aligned with the third pin hole (24), and the convex block (21) squeezes the head end of the third sliding pin (33) to retreat through the inclined surface fit, so that the tail end of the third sliding pin (33) pushes the head end of the fourth sliding pin (32) to retract to a position flush with the outer side surface (6) of the second traveling wheel (4).

3. The integral hydraulic demoulding mechanism for the internal formwork of the concrete highway small box girder according to claim 2, characterized in that, The driving device includes a power device, a swing arm (7), a first elastic device (8) and a first sliding pin (30). The power device is in transmission connection with the swing arm (7); the swing arm (7) is rotationally connected with the central axis (9); the first elastic device (8) is arranged on the swing arm (7); the first sliding pin (30) is connected to the first elastic device (8) and has a tendency to move towards the inner side surface (20) of the first traveling wheel (5) under the action of elastic force; a first pin hole (18) is opened on the outer side surface (6) of the first traveling wheel (5); a first inclined surface (29) is arranged at the head end of the first sliding pin (30), so that the head end of the first sliding pin (30) forms a tongue-shaped structure; the first inclined surface (29) faces the side where the first traveling wheel (5) rolls backward; the central distance from the first sliding pin (30) to the central axis (9) is not greater than the chord distance of the chord plane (12). When the driving device drives the first traveling wheel (5) to rotate, the head end of the first sliding pin (30) is aligned with the first pin hole (18) and enters the first pin hole (18); the end of the first inclined surface (29) protrudes from the outer side surface (6) of the first traveling wheel (5); the power device drives the first traveling wheel (5) to roll forward through the swing arm (7) and the first sliding pin (30).

4. The integral hydraulic demoulding mechanism for the internal form of a concrete highway small box girder according to claim 3, characterized in that, The elastic force of the first elastic device (8) is stronger than that of the second elastic device (3); the first pin hole (18) is formed through between the two side surfaces of the first traveling wheel (5); the first pin hole (18) is a stepped hole with a first shoulder (35); a second sliding pin (28) adapted to the shape of the first pin hole (18) is inserted into the first pin hole (18). When the traveling wheel device (2) is in the die state, the swing arm (7) rotates to a position where the first sliding pin (30) is misaligned with the first pin hole (18), and the head end of the first sliding pin (30) retracts outside the outer side surface (6) of the first traveling wheel (5); the fourth sliding pin (32), the third sliding pin (33) and the second sliding pin (28) are aligned with each other; under the elastic force of the second elastic device (3), the fourth sliding pin (32) pushes the head end of the third sliding pin (33) into and engages with the first pin hole (18); the head end of the third sliding pin (33) pushes the second sliding pin (28), so that the head end of the second sliding pin (28) moves to a position close to the outer side surface (6) of the first traveling wheel (5). When the traveling wheel device (2) changes from the die state to the traveling state, the swing arm (7) rotates to a position where the first sliding pin (30) is aligned with the first pin hole (18), the first sliding pin (30) enters the first pin hole (18), and under the elastic force of the first elastic device (8), the first sliding pin (30) pushes the second sliding pin (28) to retract; the second sliding pin (28) drives the third sliding pin (33) and the fourth sliding pin (32) to retract together; when the tail end of the second sliding pin (28) moves flush with the inner side surface (20) of the first traveling wheel (5), the first shoulder (35) blocks the retraction of the second sliding pin (28).

5. The integral hydraulic demoulding mechanism for the internal form of a small box girder of a concrete highway, as described in claim 4, is characterized in that, A baffle (16) is provided on the support (10) adjacent to the first traveling wheel (5); the baffle (16) is located on the side facing the first inclined surface (29); when the traveling wheel device (2) is in the die state, the baffle (16) is between the first sliding pin (30) and the first traveling wheel (5), and the baffle (16) blocks a part of the port of the first pin hole (18), thereby preventing the second sliding pin (28) from sliding out of the first pin hole (18); when the driving device drives the first traveling wheel (5) to rotate, the end of the first inclined surface (29) and the baffle (16) are at the same axial position of the first sliding pin (30).

6. The integral hydraulic demoulding mechanism for the internal formwork of the small box girder of the concrete highway according to claim 5, characterized in that, The third pin hole (24) is located at the end of the first chute (25); when the convex block (21) slides and rotates to be aligned with the third pin hole (24), the side wall of the convex block (21) abuts against the end surface of the first chute (25).

7. The integral hydraulic demoulding mechanism for the internal formwork of small box girders of concrete roads according to any one of claims 1 to 6, characterized in that, The follow-up device includes a fifth sliding pin (38) and a fourth spring; a fourth pin hole (22) is formed on the inner side surface (20) of the second traveling wheel (4), and a second pin hole (19) is formed on the inner side surface (20) of the first traveling wheel (5); both the second pin hole (19) and the fourth pin hole (22) are blind holes; the fourth spring and the fifth sliding pin (38) are sequentially inserted into the fourth pin hole (22), and the fourth spring is in a compressed state; the head end of the fifth sliding pin (38) is provided with a second conical surface (44), and the second pin hole (19) has a shape adapted to the head end of the fifth sliding pin (38). When the traveling wheel device (2) is in the die state, the second pin hole (19) and the fourth pin hole (22) are misaligned; when the follow-up device is in the applied fixed state, the second pin hole (19) and the fourth pin hole (22) rotate to be aligned with each other, and the head end of the fifth sliding pin (38) is snapped into the second pin hole (19) to form a bevel surface fit.

8. The integral hydraulic demoulding mechanism for the internal form of the concrete highway small box girder according to claim 7, characterized in that, The central shaft (9) is fixedly connected to the support (10), and a counterbore (42) is formed on the central shaft (9); a second sliding groove (23) is formed on the inner side surface (20) of the second traveling wheel (4). The follow-up device further includes a slider (39), a swing claw (40), a slider reset device, and a swing claw reset device; the slider (39) is slidably connected to the second sliding groove (23); one end of the swing claw (40) is hinged to the slider (39); the swing claw reset device is adapted to push the other end of the swing claw (40) into the counterbore (42) when the other end of the swing claw (40) moves to be aligned with the counterbore (42); a second inclined cutting surface (48) is provided on the swing claw (40); when the second traveling wheel (4) performs a forward rolling motion, the other end of the swing claw (40) can form a bevel surface fit with the counterbore (42) through the second inclined cutting surface (48); when the second traveling wheel (4) performs a backward rolling motion, the other end of the swing claw (40) can form an abutting relationship with the counterbore (42). A bayonet (43) is formed through the slider (39), and a ring groove (45) is formed on the fifth sliding pin (38); when the head end of the fifth sliding pin (38) is outside the second pin hole (19), the bayonet (43) is aligned with the fourth pin hole (22), and the fifth sliding pin (38) can slide freely in the fourth pin hole (22); after the head end of the fifth sliding pin (38) is snapped into the second pin hole (19), the slider reset device drives the slider (39) to slide, so that the bayonet (43) is snapped into the ring groove (45) to prevent the fifth sliding pin (38) from retracting; when the other end of the swing claw (40) abuts against the counterbore (42), as the second traveling wheel (4) rolls backward, the swing claw (40) pushes the slider (39) to align the bayonet (43) with the fourth pin hole (22).

9. The integral hydraulic demoulding mechanism for the internal form of a small box girder of a concrete highway, as claimed in claim 8, wherein The bayonet (43) has the same shape as the fourth pin hole (22). When the head end of the fifth sliding pin (38) is in the retracted state, the fifth sliding pin (38) makes the slider (39) and the second traveling wheel (4) form a fixed connection relationship. When the second walking wheel (4) performs a backward rolling motion and forms a fixed connection relationship between the slider (39) and the second walking wheel (4), the chord plane (12) of the second walking wheel (4) and the bottom surface of the inner die bottom plate (11) form a coplanar relationship.

10. The integral hydraulic demoulding mechanism for the internal formwork of a small box girder of a concrete highway, as described in claim 8, is characterized in that, The opening of the sinking groove (42) is arranged upward. The swing claw (40) includes a cross bar (49) and a vertical bar (47) that form a T-shaped connection relationship. The second inclined plane (48) is arranged at one end of the vertical bar (47) close to the central axis (9). The slider reset device and the swing claw reset device are the same third spring (41). The third spring (41) is a tension spring. The first end of the third spring (41) is connected to the other end of the vertical bar (47). The first end of the third spring (41) is connected to the inner wall of the second sliding groove (23). The distance from the first end of the third spring (41) to the axis of the central axis (9) is not less than the distance from the second end of the third spring (41) to the axis of the central axis (9).

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