Cavity type draught fan foundation formwork supporting system

Abstract

The invention discloses a cavity type fan foundation template supporting system in the technical field of fan installation, which comprises a plurality of inner molds and a plurality of outer molds, and the plurality of inner molds and the plurality of outer molds jointly form a complete annular cavity; the first fixing mechanism is coaxial with the annular cavity and located in the annular cavity, and the first fixing mechanism is used for supporting and fixing all the inner molds in the spliced state to complete demolding of the inner molds; the second demolding mechanism is located on the upper side of the outer mold and used for dismantling the outer mold in the spliced state after pouring is completed, and demolding of the outer mold is completed. The driving mechanism is located on the upper side of the inner mold and provides driving force for the first fixing mechanism, the second fixing mechanism, the first demolding mechanism and the second demolding mechanism. The device is easy to operate and convenient to use, the multiple inner molds and the multiple outer molds can be rapidly and fixedly installed, and meanwhile the multiple inner molds and the multiple outer molds can be automatically disassembled without the help of external force.

Description

Technical Field

[0001] The invention relates to the technical field of fan installation, and in particular to a cavity type fan foundation template support system. Background Art

[0002] When installing a cavity fan, a fan foundation is required as its installation foundation, so the fan foundation needs to be cast before installing the fan; the existing fan foundation needs to build a template before casting, and after the template is built, the template needs to be fixed one by one, and when fixing, it is usually necessary to install additional fixing equipment such as support frames or support rods on the ground to fix the template; when removing the template after the fan foundation solidifies, it is necessary to manually remove the fixings of each template in turn, and then it is necessary to use external force on the template to remove it. The operation of fixing and disassembling the template is cumbersome, time-consuming and labor-intensive. Summary of the invention

[0003] The object of the present invention is to provide a cavity type fan foundation formwork support system to solve the problems raised in the above background technology.

[0004] To achieve the above object, the present invention provides the following technical solution: a cavity type fan foundation template support system, comprising a plurality of inner molds and a plurality of outer molds, The plurality of inner molds and the plurality of outer molds together form a complete annular cavity; A first fixing mechanism is coaxial with the annular cavity and is located inside the annular cavity, and the first fixing mechanism is used to support and fix each inner mold in a spliced ​​state; A second fixing mechanism is coaxial with the annular cavity and is located outside the annular cavity, and the second fixing mechanism is used to support and fix each outer mold in a spliced ​​state; The first demoulding mechanism is located inside the inner mold and is used to remove the inner mold after casting is completed and in a spliced ​​state, thereby completing demoulding of the inner mold; The second demoulding mechanism is located on the upper side of the outer mold and is used to remove the outer mold in a spliced ​​state after pouring is completed to complete the demoulding of the outer mold; The driving mechanism is located on the upper side of the inner mold and provides driving force to the first fixing mechanism, the second fixing mechanism, the first demoulding mechanism and the second demoulding mechanism.

[0005] Preferably, the first fixing mechanism includes a plurality of partitions, the number of the partitions is equal to the number of inner molds, and the partitions and the inner molds are spaced apart, and the partitions fit tightly with two adjacent inner molds; the thickness of the partitions is equal to the thickness of the inner molds, and the inner side length of the partitions is greater than the outer side length; the inner side length of the inner mold is smaller than the outer side length.

[0006] Preferably, the first demolding mechanism includes a bidirectional threaded rod, which is located on the middle axis of a circular ring composed of multiple inner molds and multiple partitions, and has self-locking properties; the bidirectional threaded rod is symmetrically threadedly connected with a first driving block at the upper and lower sides, and the first driving block is provided with four first connecting rods, one end of which is rotatably connected to the rod, and the other ends of the four first connecting rods are rotatably connected to four partitions respectively; the bidirectional threaded rod is provided with a third demolding mechanism, and the third demolding mechanism is used to drive the four inner molds to separate from the fan base after the four partitions are separated from the fan base.

[0007] Preferably, the third demolding mechanism includes two second driving blocks, and the two second driving blocks are symmetrically distributed at the upper and lower sides of the bidirectional threaded rod; the distance between the two second driving blocks is smaller than the distance between the two first driving blocks; a vertical sliding groove is provided on the surface of the bidirectional threaded rod, and a rotating ring is rotatably connected to the inner side of the second driving block, and the rotating ring is slidably connected to the sliding groove on the surface of the bidirectional threaded rod; the second driving block is provided with four second connecting rods, one end of which is rotatably connected to the second driving block, and the other ends of the four second connecting rods are rotatably connected to the four inner molds respectively; a first spring is provided between the two second driving blocks, and the two ends of the first spring are fixedly connected to the two second driving blocks respectively.

[0008] Preferably, the second fixing mechanism includes a plurality of hinges, the number of the hinges is equal to the number of the outer molds, and the plurality of hinges and the plurality of outer molds are distributed at intervals; the hinge is located at the bottom of the outer mold and is hingedly connected to two adjacent outer molds.

[0009] Preferably, the second demolding mechanism includes a fixed plate, four fixed rods are fixedly connected at a position above the fixed plate and a lifting frame is provided above the four fixed rods, the lifting frame is slidably connected to the four fixed rods and a plurality of fourth connecting rods are rotatably connected to the lifting frame; a plurality of limit rods are fixedly connected to the side positions of the fixed plate, and the number of the limit rods is equal to the number of the fourth connecting rods and the outer mold; a sliding rod is slidably connected to the limit rod, and the other end of one of the fourth connecting rods is rotatably connected to the sliding rod; a clamping block is fixedly connected at the bottom position of one outer end of the sliding rod; a clamping rod is provided at a position above the outer mold and the clamping rod is fixedly connected to the outer mold, and the clamping block is clamped and matched with the clamping rod.

[0010] Preferably, the driving mechanism includes a first motor, which is fixedly connected to a fixed disk and a worm is fixedly connected to an output end of the first motor; the fixed disk is rotatably connected to a worm wheel, the worm is meshed with the worm wheel and the worm wheel is fixedly connected to a bidirectional threaded rod; the upper end of the worm wheel is rotatably connected to a support disk, a first cylinder is fixedly connected above the support disk, and an upper end of the first cylinder is fixedly connected to a lifting frame.

[0011] Preferably, a fixing ring is provided between two adjacent sliding rods, and an electric clamp is slidably connected to the fixing ring; a second cylinder is fixedly connected to the outer surface of the fixing ring, and the telescopic end of the second cylinder is fixedly connected to the electric clamp; the fixing ring is fixedly connected to telescopic shafts at both ends close to the two sliding rods, and the telescopic shaft is rotatably connected to the sliding rod; a universal joint is provided at the bottom of the sliding rod, and the universal joint is connected to the two telescopic shafts at the bottom of the sliding rod; a second motor is fixedly connected to several of the sliding rods, and the output end of the second motor is fixedly connected to the first pulley, and a second pulley is fixedly connected to the telescopic shaft located at the bottom of the first pulley and a belt is provided on the second pulley, and the belt is meshed with the first pulley and the second pulley at the same time.

[0012] Compared with the prior art, the present invention has the following beneficial effects: The present invention first assembles multiple inner molds into an annular shape, then fixes the multiple inner molds through a first fixing mechanism, and then assembles multiple outer molds into a larger annular shape at the outer side of the inner molds, and then quickly fixes the multiple outer molds at one time through a second fixing mechanism. There is no need to install an additional support frame, and the operation is relatively convenient.

[0013] According to the present invention, after the concrete solidifies, all the inner molds and all the outer molds need to be removed. By starting the driving mechanism, the first demoulding mechanism and the second demoulding mechanism can be driven to operate, and the first demoulding mechanism and the second demoulding mechanism can automatically remove all the inner molds and the outer molds from the solidified fan foundation; the device can automatically and quickly complete the disassembly of multiple inner molds and multiple outer molds without the need for external force. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a bottom view structural schematic diagram of the present invention; Figure 3 It is a schematic diagram of the split structure of the present invention; Figure 4 It is a structural schematic diagram of the driving mechanism in the present invention; Figure 5 It is a structural schematic diagram of the second demoulding mechanism in the present invention; Figure 6 It is a structural schematic diagram of the first demoulding mechanism in the present invention; Figure 7 is a schematic diagram of the first demoulding mechanism in the present invention; Figure 8 It is a schematic diagram of the third demoulding mechanism in the present invention.

[0015] In the accompanying drawings, the components represented by the reference numerals are as follows: 1. Inner mold; 2. Outer mold; 3. Partition; 4. Bidirectional threaded rod; 5. First drive block; 6. First connecting rod; 7. Second drive block; 8. Rotating ring; 9. Second connecting rod; 10. First spring; 11. Hinge; 25. Fixed plate; 26. Fixed rod; 27. Lifting frame; 28. Fourth connecting rod; 29. ​​Limit rod; 30. Sliding rod; 31. Snap block; 32. Snap rod; 34. First motor; 35. Worm; 36. Worm wheel; 37. Support plate; 38. First cylinder; 39. Fixed ring; 40. Electric clamp; 41. Second cylinder; 42. Telescopic shaft; 43. Universal joint; 44. Second motor; 45. First pulley; 46. Second pulley; 47. Belt. DETAILED DESCRIPTION

[0016] In order to further understand the content of the present invention, the present invention is described in detail in conjunction with the accompanying drawings.

[0017] See also Figure 1-Figure 8 The present invention provides a technical solution: a cavity fan foundation template support system, comprising: A plurality of inner molds 1 and a plurality of outer molds 2, wherein the plurality of inner molds 1 and the plurality of outer molds 2 together form a complete annular cavity; A first fixing mechanism is coaxial with the annular cavity and is located inside the annular cavity. The first fixing mechanism is used to support and fix each inner mold 1 in a spliced ​​state; The second fixing mechanism is coaxial with the annular cavity and is located outside the annular cavity, and the second fixing mechanism is used to support and fix each outer mold 2 in a spliced ​​state; The first demoulding mechanism is located inside the inner mold 1 and is used to remove the inner mold 1 after casting is completed and in a spliced ​​state, thereby completing demoulding of the inner mold 1; The second demoulding mechanism is located on the upper side of the outer mold 2 and is used to remove the outer mold 2 in a spliced ​​state after pouring is completed, thereby completing the demoulding of the outer mold 2; The driving mechanism is located on the upper side of the inner mold 1 and provides driving force to the first fixing mechanism, the second fixing mechanism, the first demoulding mechanism and the second demoulding mechanism; During operation, when pouring the fan foundation of the fan, first assemble multiple inner molds 1 into a ring shape, then fix the multiple inner molds 1 by a first fixing mechanism, and then assemble multiple outer molds 2 into a larger ring shape at the outer side of the inner mold 1, and then fix the multiple outer molds 2 by a second fixing mechanism. At this time, concrete can be poured into the interlayer between the inner mold 1 and the outer mold 2. After the pouring is completed, just wait for the concrete to solidify; after the concrete solidifies, all the inner molds 1 and all the outer molds 2 need to be removed at this time, and the first demolding mechanism and the second demolding mechanism can be driven to operate by starting the driving mechanism, and the first demolding mechanism and the second demolding mechanism can automatically remove all the inner molds 1 and the outer molds 2 from the solidified fan foundation; the device is simple to operate and easy to use, and can quickly complete the fixed installation of multiple inner molds 1 and multiple outer molds 2, and can automatically complete the disassembly of multiple inner molds 1 and multiple outer molds 2.

[0018] like Figure 2-Figure 3 As shown, as a further solution of the present invention, the first fixing mechanism includes a plurality of partitions 3, the number of the partitions 3 is equal to the number of the inner molds 1, and the partitions 3 are spaced apart from the inner molds 1, and the partitions 3 are tightly fitted with two adjacent inner molds 1; the thickness of the partitions 3 is equal to the thickness of the inner molds 1, and the inner side length of the partitions 3 is greater than the outer side length; the inner side length of the inner mold 1 is less than the outer side length; During operation, multiple partitions 3 are placed between two adjacent inner molds 1 at intervals. At this time, the multiple partitions 3 and the multiple inner molds 1 form a ring shape. The inner mold 1 cannot move inward under the extrusion of the partitions 3. At the same time, since the outer part of the inner mold 1 fits with the fan foundation, the inner mold 1 cannot move inward either. Therefore, the inner mold 1 will be in a fixed state; when the inner mold 1 needs to be disassembled, the partition 3 is moved inward to separate from the inner mold 1. At this time, the inner mold 1 loses the extrusion of the partition 3 and can move inward to separate from the fan foundation.

[0019] like Figure 6-Figure 8 As shown, as a further solution of the present invention, the first demoulding mechanism includes a bidirectional threaded rod 4, which is located on the central axis of a ring composed of multiple inner molds 1 and multiple partitions 3, and the bidirectional threaded rod 4 has self-locking properties; the bidirectional threaded rod 4 is symmetrically threadedly connected with a first driving block 5 at the upper and lower sides, and the first driving block 5 is provided with four first connecting rods 6, one end of which is rotatably connected to the first driving block 5, and the other ends of the four first connecting rods 6 are rotatably connected to the four partitions 3 respectively; the bidirectional threaded rod 4 is provided with a third demoulding mechanism, and the third demoulding mechanism is used to drive the four inner molds 1 to be separated from the fan foundation after the four partitions 3 are separated from the fan foundation; The third demoulding mechanism includes two second driving blocks 7, which are symmetrically distributed at the upper and lower sides of the bidirectional threaded rod 4; the distance between the two second driving blocks 7 is smaller than the distance between the two first driving blocks 5; a vertical sliding groove is provided on the surface of the bidirectional threaded rod 4, and a rotating ring 8 is rotatably connected to the inner side of the second driving block 7, and the rotating ring 8 is slidably connected to the sliding groove on the surface of the bidirectional threaded rod 4; four second connecting rods 9 are rotatably connected to the second driving block 7 at one end, and the other ends of the four second connecting rods 9 are rotatably connected to the four inner molds 1 respectively; a first spring 10 is provided between the two second driving blocks 7, and the two ends of the first spring 10 are fixedly connected to the two second driving blocks 7 respectively; During operation, when the partition 3 is fitted with the inner mold 1, the first driving block 5 remains stationary under the action of the bidirectional threaded rod 4, and the first driving block 5 can ensure that the partition 3 is stably fitted with the inner mold 1 through the first connecting rod 6; when the inner mold 1 needs to be disassembled, by driving the bidirectional threaded rod 4 to rotate, the bidirectional threaded rod 4 will drive the first driving blocks 5 on the upper and lower sides to move to positions close to each other at the same time. At this time, when the two first driving blocks 5 move, they will pull the partition 3 to the inner position through the first connecting rod 6, and the partition 3 will gradually separate from the fan foundation and the inner mold 1; when the first driving block 5 moves a certain distance, it will contact the second driving block 7. As the bidirectional threaded rod 4 continues to rotate, the first driving block 5 will push the second driving block 7 to move, and the second driving blocks 7 on the upper and lower sides will move to positions close to each other at this time. When the two second driving blocks 7 move, they will pull the inner mold 1 to the inner position through the second connecting rod 9, and the inner mold 1 will separate from the fan foundation when it moves.

[0020] like Figure 1-Figure 3 As shown, as a further solution of the present invention, the second fixing mechanism includes a plurality of hinges 11, the number of the hinges 11 is equal to the number of the outer molds 2, and the plurality of hinges 11 and the plurality of outer molds 2 are distributed at intervals; the hinge 11 is located at the bottom of the outer mold 2 and the hinge 11 is hingedly arranged with two adjacent outer molds 2; During operation, before pouring, the bottom parts of multiple outer molds 2 can be connected to each other through multiple hinges 11, and then the multiple outer molds 2 can be placed in the pouring position; the multiple hinges 11 can achieve the effect of connecting the multiple outer molds 2 together.

[0021] like Figure 3-Figure 4As shown, as a further solution of the present invention, the second demoulding mechanism includes a fixed plate 25, four fixed rods 26 are fixedly connected at the upper position of the fixed plate 25, and a lifting frame 27 is provided above the four fixed rods 26, the lifting frame 27 is slidably connected to the four fixed rods 26, and a plurality of fourth connecting rods 28 are rotatably connected to the lifting frame 27; a plurality of limiting rods 29 are fixedly connected to the side position of the fixed plate 25, and the number of limiting rods 29 is equal to the number of fourth connecting rods 28 and the outer mold 2; a sliding rod 30 is slidably connected to the limiting rod 29, and the other end of one of the fourth connecting rods 28 is rotatably connected to the sliding rod 30; a clamping block 31 is fixedly connected to the bottom position of one end of the outer side of the sliding rod 30; a clamping rod 32 is provided at the upper position of the outer mold 2 and the clamping rod 32 is fixedly connected to the outer mold 2, and the clamping block 31 is clamped and matched with the clamping rod 32; During operation, when the outer mold 2 needs to be removed, all the sliding rods 30 are driven to slide to the outer position. When the sliding rods 30 slide, the clamping blocks 31 connected thereto are driven to move. When the clamping blocks 31 move, the clamping rods 32 push the upper part of the outer mold 2 to expand outward. When the upper part of the outer mold 2 expands outward, the outer mold 2 will be separated from the fan foundation, thereby achieving the purpose of demolding.

[0022] like Figure 3-Figure 4 As shown, as a further solution of the present invention, the driving mechanism includes a first motor 34, the first motor 34 is fixedly connected to the fixed disk 25, and a worm 35 is fixedly connected to the output end of the first motor 34; a worm wheel 36 is rotatably connected to the middle position of the fixed disk 25, the worm 35 is meshed with the worm wheel 36, and the worm wheel 36 is fixedly connected to the bidirectional threaded rod 4; the upper end of the worm wheel 36 is rotatably connected to the support disk 37, and a first cylinder 38 is fixedly connected above the support disk 37, and the upper end of the first cylinder 38 is fixedly connected to the lifting frame 27; During operation, when the first motor 34 is started, the first motor 34 will drive the worm 35 to rotate, and when the worm 35 rotates, it will drive the worm wheel 36 to rotate, and the worm wheel 36 will drive the bidirectional threaded rod 4 to rotate, and when the bidirectional threaded rod 4 rotates, it will drive the two first driving blocks 5 connected thereto to move; since the clamping block 31 is in a clamping state with the clamping rod 32 at this time, the fixed disk 25 is in a fixed state at this time, and the bidirectional threaded rod 4 is arranged on the fixed disk 25, so the bidirectional threaded rod 4 will always remain in the center position in the fan foundation unchanged, when the bidirectional threaded rod 4 drives the first driving block 5 to move, the first driving block 5 will pull the four partitions 3 to the center position through the four first connecting rods 6, and when the first driving block 5 pushes the second driving block 7 to move, the second driving block 7 will respectively pull the four inner molds 1 to the center position through the four second connecting rods 9, so that the demoulding of the inner mold 1 and the partition 3 can be completed; the bidirectional threaded rod 4 is fixed at the middle position in the fan foundation by the fixed disk 25, and the bidirectional threaded rod 4 can provide the force required for the inner mold 1 during demoulding; When the four partitions 3 and the four inner molds 1 are separated from the fan foundation, the first motor 34 is started to drive the worm 35 to rotate in the opposite direction, so that the four inner molds 1 and the four partitions 3 can be pressed against the inner wall of the fan foundation again in succession. When the inner mold 1 and the partition 3 are pressed against the inner wall of the fan foundation, the bidirectional threaded rod 4 will be fixed in the middle position of the fan foundation by the inner mold 1, and then the first motor 34 is stopped and the first cylinder 38 is started to drive the lifting frame 27 to move downward. When the lifting frame 27 moves downward, the multiple fourth connecting rods 28 connected to the lifting frame 27 will push the multiple sliding rods 30 to slide to the outer position. The sliding rod 30 pushes the clamping rod 32 to move to the outer position through the clamping block 31. The clamping rod 32 will drive the upper part of the outer mold 2 to expand outward, and the outer mold 2 will be separated from the fan foundation; since the bidirectional threaded rod 4 is fixed in the middle position in the fan foundation, the fixing plate 25 connected to the bidirectional threaded rod 4 will also be fixed in the middle position, so it can provide the force required for demolding the outer mold 2.

[0023] like Figure 5 As shown, as a further solution of the present invention, a fixing ring 39 is provided between two adjacent sliding rods 30, and an electric clamp 40 is slidably connected inside the fixing ring 39; a second cylinder 41 is fixedly connected to the outer surface of the fixing ring 39, and the telescopic end of the second cylinder 41 is fixedly connected to the electric clamp 40; the fixing ring 39 is fixedly connected to telescopic shafts 42 at both ends near the two sliding rods 30, and the telescopic shaft 42 is rotatably connected to the sliding rod 30; a universal joint 43 is provided at the bottom of the sliding rod 30, and the universal joint 43 is connected to the two telescopic shafts 42 at the bottom of the sliding rod 30; a second motor 44 is fixedly connected to a plurality of sliding rods 30, and a first pulley 45 is fixedly connected to the output end of the second motor 44, a second pulley 46 is fixedly connected to the telescopic shaft 42 located at the bottom of the first pulley 45, and a belt 47 is provided on the second pulley 46, and the belt 47 is meshed with the first pulley 45 and the second pulley 46 at the same time; During operation, before starting to cast the foundation of the fan, multiple anchor cable sleeves are inserted into the electric clamp 40 and the top of the anchor cable sleeve is kept at the bottom side of the electric clamp 40, and then the anchor cable sleeve is clamped by the electric clamp 40; at this time, several second motors 44 are started at the same time according to the angle at which the anchor cable sleeve needs to be tilted, and the second motor 44 drives the first pulley 45 to rotate, and the first pulley 45 drives the second pulley 46 to rotate through the belt 47, and the second pulley 46 will drive the telescopic shaft 42 connected thereto to rotate, and the multiple telescopic shafts 42 can drive all the fixing rings 39 to rotate through multiple universal joints 43, and the fixing ring 39 will drive the anchor cable sleeve rod to rotate and tilt through the electric clamp 40. When the anchor cable sleeve is tilted to a certain angle, the second motor 44 is stopped and the casting of the fan foundation is started; when demoulding is required, the electric clamp 40 is first started to loosen the anchor cable sleeve, and then the second cylinder 41 is started to drive the electric clamp 40 to move upward and disengage from the anchor cable sleeve.

Claims

1. A cavity type fan foundation template support system, comprising a plurality of inner molds (1) and a plurality of outer molds (2), characterized in that: The plurality of inner molds (1) and the plurality of outer molds (2) together form a complete annular cavity; A first fixing mechanism, coaxial with the annular cavity and located inside the annular cavity, the first fixing mechanism being used to support and fix each inner mold (1) in a spliced ​​state; A second fixing mechanism is coaxial with the annular cavity and is located outside the annular cavity, the second fixing mechanism being used to support and fix each outer mold (2) in a spliced ​​state; A first demoulding mechanism, located inside the inner mold (1), is used to remove the inner mold (1) after casting is completed and in a spliced ​​state, thereby completing demoulding of the inner mold (1); A second demoulding mechanism is located on the upper side of the outer mold (2) and is used to remove the outer mold (2) in a spliced ​​state after casting is completed, thereby completing the demoulding of the outer mold (2); The driving mechanism is located on the upper side of the inner mould (1) and provides driving force to the first fixing mechanism, the second fixing mechanism, the first demoulding mechanism and the second demoulding mechanism.

2. According to claim 1, a cavity fan foundation formwork support system is characterized by: The first fixing mechanism comprises a plurality of partitions (3), the number of the partitions (3) being equal to the number of the inner moulds (1), the partitions (3) and the inner moulds (1) being spaced apart, the partitions (3) and the two adjacent inner moulds (1) being tightly fitted; the thickness of the partitions (3) being equal to the thickness of the inner moulds (1), the inner side length of the partitions (3) being greater than the outer side length; and the inner side length of the inner mould (1) being less than the outer side length.

3. A cavity type fan foundation formwork support system according to claim 2, characterized in that: The first demoulding mechanism comprises a bidirectional threaded rod (4), the bidirectional threaded rod (4) being located at the central axis position of a circular ring formed by the plurality of inner moulds (1) and the plurality of partitions (3), and the bidirectional threaded rod (4) is self-locking; the bidirectional threaded rod (4) is symmetrically threadedly connected to a first driving block (5) at upper and lower sides thereof, the first driving block (5) being provided with four first connecting rods (6) each having one end rotatably connected thereto, and the other ends of the four first connecting rods (6) are respectively rotatably connected to four partitions (3); the bidirectional threaded rod (4) is provided with a third demoulding mechanism, the third demoulding mechanism being used to drive the four inner moulds (1) to be detached from the fan base after the four partitions (3) are detached from the fan base.

4. A cavity type fan foundation formwork support system according to claim 3, characterized in that: The third demoulding mechanism comprises two second driving blocks (7), which are symmetrically distributed at the upper and lower sides of the bidirectional threaded rod (4); the distance between the two second driving blocks (7) is smaller than the distance between the two first driving blocks (5); a vertical sliding groove is provided on the surface of the bidirectional threaded rod (4), a rotating ring (8) is rotatably connected to the inner side of the second driving block (7), and the rotating ring (8) is slidably connected to the sliding groove on the surface of the bidirectional threaded rod (4); the second driving block (7) is provided with four second connecting rods (9) each of which is rotatably connected to the second driving block (7), and the other ends of the four second connecting rods (9) are rotatably connected to four inner molds (1) respectively; a first spring (10) is provided between the two second driving blocks (7), and the two ends of the first spring (10) are respectively fixedly connected to the two second driving blocks (7).

5. According to claim 1, a cavity type fan foundation formwork support system is characterized by: The second fixing mechanism comprises a plurality of hinges (11), the number of the hinges (11) being equal to the number of the outer moulds (2), and the plurality of hinges (11) and the plurality of outer moulds (2) being distributed at intervals; the hinge (11) is located at the bottom of the outer mould (2) and the hinge (11) is hingedly connected to two adjacent outer moulds (2).

6. The cavity type fan foundation formwork support system according to claim 1, characterized in that: The second demoulding mechanism comprises a fixed plate (25), four fixed rods (26) are fixedly connected to the upper position of the fixed plate (25), and a lifting frame (27) is provided above the four fixed rods (26), the lifting frame (27) is slidably connected to the four fixed rods (26), and a plurality of fourth connecting rods (28) are rotatably connected to the lifting frame (27); a plurality of limiting rods (29) are fixedly connected to the side position of the fixed plate (25), and the number of the limiting rods (29) is equal to the number of the fourth connecting rods (28) and the outer mold (2); a sliding rod (30) is slidably connected to the limiting rod (29), and the other end of one of the fourth connecting rods (28) is rotatably connected to the sliding rod (30); a clamping block (31) is fixedly connected to the bottom position of one outer end of the sliding rod (30); a clamping rod (32) is provided above the outer mold (2), and the clamping rod (32) is fixedly connected to the outer mold (2), and the clamping block (31) is clamped and matched with the clamping rod (32).

7. A cavity type fan foundation formwork support system according to claim 6, characterized in that: The driving mechanism comprises a first motor (34), the first motor (34) being fixedly connected to a fixed disk (25), and a worm (35) being fixedly connected to an output end of the first motor (34); the fixed disk (25) being rotatably connected to a worm wheel (36), the worm (35) being meshed with the worm wheel (36), and the worm wheel (36) being fixedly connected to a bidirectional threaded rod (4); the upper end of the worm wheel (36) being rotatably connected to a support disk (37), the upper end of the support disk (37) being fixedly connected to a first cylinder (38), and the upper end of the first cylinder (38) being fixedly connected to a lifting frame (27).

8. A cavity type fan foundation formwork support system according to claim 6, characterized in that: A fixing ring (39) is provided between two adjacent sliding rods (30), and an electric clamp (40) is slidably connected inside the fixing ring (39); a second cylinder (41) is fixedly connected to the outer surface of the fixing ring (39), and the telescopic end of the second cylinder (41) is fixedly connected to the electric clamp (40); the fixing ring (39) is fixedly connected to telescopic shafts (42) at both ends close to the two sliding rods (30), and the telescopic shaft (42) is rotatably connected to the sliding rod (30); a universal joint (42) is provided at the bottom of the sliding rod (30) 43), the universal joint (43) is connected to two telescopic shafts (42) at the bottom of the sliding rod (30); a second motor (44) is fixedly connected to a plurality of the sliding rods (30), the output end of the second motor (44) is fixedly connected to a first pulley (45), a second pulley (46) is fixedly connected to the telescopic shaft (42) at the bottom of the first pulley (45), and a belt (47) is provided on the second pulley (46), and the belt (47) is meshed with the first pulley (45) and the second pulley (46) at the same time.

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