A rubber-tired distributing machine suitable for construction of a cast-in-place box girder

Abstract

The application belongs to the technical field of road construction, and particularly relates to a rubber-tired distributing machine suitable for suspended pouring of a box girder, which comprises a balanced conveying vehicle, the upper surface of the balanced conveying vehicle is fixedly connected with a square-shaped support table, a rotary mounting frame is installed on the upper surface of the support table, a distribution adapting device is installed at the front end of the rotary mounting frame, a counterweight device is arranged on the lower surface of the rear end of the rotary mounting frame, and a distribution pipe penetrating through the upper surface of the support table is arranged at the bottom of the balanced conveying vehicle. The rubber-tired distributing machine suitable for suspended pouring of a box girder has the flexible rotation function, the component structure is light, the concrete pouring is light and fast, only one person is needed to operate, the manpower investment is reduced, the continuous concrete pouring can be ensured, the construction cold joint in the suspended pouring process can be eliminated, and obvious economic and quality benefits are obtained.

Description

Technical Field

[0001] This invention relates to the field of road construction technology, and in particular to a rubber-tired concrete placing machine suitable for cantilever box girder construction. Background Technology

[0002] A rigid frame bridge is a bridge whose main load-bearing structure is a rigid frame, meaning that the beams and legs or piers are rigidly connected. The main load-bearing structure of a rigid frame bridge is a rigid frame structure in which the beams and piers are fixed together. Because the beams and piers are fixed together, the beams and piers are subjected to the force as a whole. The piers not only bear the vertical pressure caused by the load on the beams, but also bear the bending moment and horizontal thrust. The conventional method for pouring concrete for cantilevered rigid frame bridges is to use a horizontal pump truck to pump the concrete and deliver it to the working face through a steel pump pipe. Due to site limitations, it is very difficult to directly use the pump pipe for concrete placement, and the uneven placement can easily wash away the formwork, causing the formwork to shift and contaminating the formwork surface, which affects the appearance quality of the concrete. Summary of the Invention

[0003] Given the technical problems of existing concrete placing machines that directly use pump pipes for concrete placement, resulting in uneven material distribution and easy erosion of the formwork, which can lead to formwork displacement, contamination of the formwork surface, and impact on the appearance quality of the concrete, this invention proposes a rubber-tired concrete placing machine suitable for cantilever box girder construction.

[0004] The present invention proposes a rubber-tired concrete placing machine suitable for cantilever box girder construction, comprising a balancing conveyor vehicle, a square support platform fixedly connected to the upper surface of the balancing conveyor vehicle, a rotating mounting frame mounted on the upper surface of the support platform, a material placing device mounted at the front end of the rotating mounting frame, a material placing pipe extending through the lower surface of the support platform from the bottom of the balancing conveyor vehicle, and a counterweight device mounted on the lower rear end of the rotating mounting frame.

[0005] The rotating mounting frame is used to install the fabric adapting device and the counterweight device, and to control the fabric range during the fabric application process.

[0006] The concrete placement device is used to evenly lay the concrete, so as to achieve orderly and neat concrete placement for the rigid frame bridge when the rotating mounting frame rotates. The concrete placement device includes a concrete placement platform fixed to the outer surface of the front end of the rotating mounting frame.

[0007] The counterweight device is used to balance the weight added to the front end of the rotating mounting frame when the material adapting device pours concrete for the rigid frame bridge. The counterweight device includes a counterweight box fixed to the lower surface of the rear end of the rotating mounting frame.

[0008] Preferably, the rotary mounting bracket includes a worm gear disk rotatably sleeved on the upper surface of the support platform, a drive motor is fixedly mounted on one side surface of the support platform via a mounting seat, and a worm gear fixedly connected to the spindle end face of the drive motor is mounted on the upper surface of the support platform via a bearing seat.

[0009] The above technical solution enables the worm gear to rotate when the drive motor is running, and the worm gear is supported and installed by the bearing housing.

[0010] Preferably, the worm gear meshes with the worm wheel, thereby driving the integrated frame fixedly connected to the upper surface of the worm wheel to rotate. An adding tube that is rotatably sleeved on the middle of the worm wheel is fixedly connected to the outer part of the fabric tube.

[0011] The above technical solution controls the rotation of the rotating mounting frame by the cooperation of the worm gear and the worm wheel, and adjusts the direction of the rotating mounting frame. Concrete is transported by the cooperation of the adding pipe and the placing pipe.

[0012] Preferably, two mirror-distributed hydraulic cylinders are fixedly installed on the inner wall of one end of the fabric platform. An auxiliary seat is fixedly connected to the surface of the hydraulic rod of the hydraulic cylinder away from the piston. The end of the adding tube passes through the lower surface of the fabric platform and is rotatably sleeved with a connecting pipe. A transmission gear is fixedly sleeved on the outer surface of the connecting pipe.

[0013] Through the above technical solution, the distance between the hydraulic cylinder extension and retraction control auxiliary seat and the material distribution table is controlled, thereby controlling the coupling pipe to rotate and connect with the addition pipe.

[0014] Preferably, a first geared motor is fixedly installed on the lower surface of the fabric table, and a drive gear that meshes with the transmission gear is fixedly connected to the outer surface of the main shaft of the first geared motor.

[0015] The above technical solution controls the rotation of the drive gear by the first reduction motor, and controls the rotation of the connecting pipe by the cooperation of the drive gear and the transmission gear.

[0016] Preferably, an extension tube is movably sleeved on the inner wall of the connecting pipe, and the inner wall of the connecting pipe and one end surface of the extension tube are fixedly connected by a telescopic rod, and a protective sleeve is provided between the connecting pipe and the extension tube.

[0017] The above technical solution connects the connecting pipe and the extension pipe with a telescopic rod, and protects the telescopic rod with a protective sleeve to prevent concrete from affecting the telescopic rod.

[0018] Preferably, guide rails are fixedly connected to the outer surfaces of both sides of the connecting tube, and L-shaped retaining rods are slidably inserted into the inner walls of the guide rails. The opposing surfaces of the two L-shaped retaining rods are respectively fixedly connected to the outer surfaces of both sides of the extension tube.

[0019] The above technical solution guides the L-shaped retaining rod via a guide rail, and the movement of the L-shaped retaining rod drives the extension tube to move within the connecting tube.

[0020] Preferably, a load-bearing rod is fixedly connected to the upper surface of each of the two L-shaped retaining rods, and a guide groove with an arc structure is opened on the lower surface of the auxiliary seat. The upper outer surface of the load-bearing rod is slidably sleeved with the inner wall of the guide groove.

[0021] The above technical solution uses the cooperation of the load-bearing rod and the guide groove to support and guide one end of the extension tube.

[0022] Preferably, a second reduction motor is installed on the inner wall of the middle part of the counterweight box, and a winding column with steel wire rope wound on both outer surfaces is installed on the inner wall of the middle part of the counterweight box through a bearing seat. The free end of the steel wire rope passes through the top of the rotating mounting frame and is fixedly connected to the upper end of the auxiliary seat. One end of the winding column is fixedly connected to the main shaft end of the second reduction motor. A traveling gear is fixedly sleeved on the outer surface of the middle part of the winding column. Limit rails are fixedly connected to both inner walls of the counterweight box.

[0023] Through the above technical solution, the second reduction motor drives the winding column to wind and unwind the wire rope, while controlling the travel gear to rotate.

[0024] Preferably, the inner wall of the counterweight box is provided with a counterweight rack that meshes with the traveling gear. Both sides of the counterweight rack are provided with limiting grooves that slide into the outer surface of one end of the limiting rail. The counterweight rack is formed by hinged joints of multiple meshing seats. A hinge shaft and a retaining seat are respectively installed on the bottom sides of each pair of meshing seats. Adjacent hinge shafts and retaining seats are movably connected. Both ends of the hinge shaft are rotatably connected to guide wheels.

[0025] Through the above technical solution, the rotation of the traveling gear drives the counterweight rack to move, the counterweight rack is guided by the limit rail, and the gravity point of the meshing seat is controlled by the hinge between the meshing seats.

[0026] The beneficial effects of this invention are as follows: This rubber-tired concrete placing machine features flexible rotation and a lightweight structure, making concrete pouring quick and easy. It requires only one person to operate, reducing manpower input and ensuring continuous concrete pouring. It can also prevent cold joints during cantilever pouring, resulting in significant economic and quality benefits.

[0027] By setting up a rotating mounting frame, a drive motor drives the worm gear to rotate. Due to the meshing between the worm gear and the worm wheel, the rotating mounting frame rotates. Subsequently, the concrete in the placing pipe enters the adding pipe, the connecting pipe, and the extension pipe in sequence, and the concrete is poured into the rigid frame bridge through the extension pipe, thereby controlling the pouring direction.

[0028] 3. By setting up a material adaptation device, when small-scale pouring is required, there is no need to control the rotation of the rotating mounting frame. Instead, the first reduction motor is started, and the meshing of the drive gear and transmission gear drives the connecting pipe to rotate, thereby controlling the position of the extension pipe opening. At the same time, the extension pipe extends and retracts within the connecting pipe, and the load-bearing rod slides synchronously within the guide groove, keeping the pouring surface on a straight line, thus ensuring the pouring quality.

[0029] 4. By setting a counterweight device, the auxiliary seat is controlled to move forward under the drive of the hydraulic cylinder. At the same time, the second reduction motor drives the winding column to rotate, loosening the wire rope. The traveling gear rotates, controlling the counterweight rack to move towards the rear end of the rotating mounting frame, thereby increasing the weight at the rear end of the rotating mounting frame and keeping both ends of the rotating mounting frame balanced. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of a rubber-tired concrete placing machine suitable for cantilever box girder construction proposed in this invention; Figure 2 This is a perspective view of a rotating mounting frame structure for a rubber-tired concrete placing machine suitable for cantilever box girder construction proposed in this invention. Figure 3 This is a perspective view of the worm gear disc structure of a rubber-tired concrete placing machine suitable for cantilever box girder construction proposed in this invention; Figure 4 This is a perspective view of an L-shaped retaining rod structure for a rubber-tired concrete placing boom suitable for cantilever box girder construction, as proposed in this invention. Figure 5 This is a three-dimensional view of the counterweight rack structure of a rubber-tired concrete placing machine suitable for cantilever box girder construction proposed in this invention; Figure 6 This is a three-dimensional view of the limiting rail structure of a rubber-tired concrete placing machine suitable for cantilever box girder construction proposed in this invention; Figure 7 This invention proposes a rubber-tired concrete placing boom suitable for cantilever box girder construction. Figure 2 Enlarged view of the structure at point A in the middle; Figure 8 This is a perspective view of the meshing seat structure of a rubber-tired concrete placing boom suitable for cantilever box girder construction proposed in this invention; Figure 9 This is a perspective view of the hydraulic cylinder structure of a rubber-tired concrete placing machine suitable for cantilever box girder construction proposed in this invention.

[0031] In the diagram: 1. Balance conveyor; 2. Support platform; 3. Rotary mounting frame; 4. Material placing pipe; 5. Drive motor; 51. Worm gear; 52. Adding pipe; 53. Worm wheel; 6. Material placing table; 61. Hydraulic cylinder; 62. Auxiliary seat; 63. Connecting pipe; 64. Transmission gear; 65. First geared motor; 66. Drive gear; 67. Extension pipe; 68. Telescopic rod; 69. Protective sleeve; 610. Guide rail; 611. L-shaped retaining rod; 612. Load-bearing rod; 613. Guide groove; 7. Counterweight box; 71. Second geared motor; 72. Winding column; 73. Traveling gear; 74. Limiting rail; 75. Counterweight rack; 76. Limiting groove; 77. Engaging seat; 78. Hinge shaft; 79. Card seat. Detailed Implementation

[0032] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0033] Reference Figures 1-9 A rubber-tired concrete placing machine suitable for cantilever box girder construction includes a balancing conveyor 1, which drives the equipment to move. To ensure stable installation of the rotating mounting frame 3, a square support platform 2 is fixedly connected to the upper surface of the balancing conveyor 1. The rotating mounting frame 3 is then installed on the upper surface of the support platform 2. A material placing device is installed at the front end of the rotating mounting frame 3. A material placing pipe 4 is provided at the bottom of the balancing conveyor 1, extending through to the upper surface of the support platform 2. A counterweight device is provided on the lower rear end surface of the rotating mounting frame 3. Cameras are installed on the top of the rotating mounting frame 3 and the lower surface of the material placing device.

[0034] like Figures 1-4As shown, the rotating mounting frame 3 is used to install the fabric adapting device and the counterweight device, and to control the fabric application range during the fabric application process. To control the angular rotation of the rotating mounting frame 3 and thus achieve large-area casting, the rotating mounting frame 3 includes a worm gear 53 rotatably sleeved on the upper surface of the support platform 2. To drive the rotating mounting frame 3, a drive motor 5 is fixedly mounted on one side surface of the support platform 2 via a mounting seat. To ensure that the rotational force of the drive motor 5 can control the rotating mounting frame 3 and to stably install the worm gear 51, a bearing seat is installed on the upper surface of the support platform 2, which is fixed to the spindle end face of the drive motor 5. The worm gear 51, which is fixedly connected, rotates when the drive motor 5 is running. The worm gear 51 is supported and installed by the bearing seat, so that the worm gear 51 meshes with the worm wheel disk 53 for transmission, thereby driving the integrated frame fixedly connected to the upper surface of the worm wheel disk 53 to rotate. In order to prevent the material placing pipe 4 from not rotating synchronously when the rotating mounting frame 3 rotates, an adding pipe 52 is fixedly sleeved in the middle of the worm wheel disk 53 and rotates to be sleeved on the outside of the material placing pipe 4. The rotation of the rotating mounting frame 3 is controlled by the cooperation between the worm gear 51 and the worm wheel disk 53, and the direction of the rotating mounting frame 3 is adjusted. The concrete is transported by the cooperation between the adding pipe 52 and the material placing pipe 4.

[0035] By setting up a rotating mounting frame 3, the worm gear 51 is driven to rotate by the drive motor 5. Due to the meshing of the worm gear 51 and the worm wheel 53, the rotating mounting frame 3 is driven to rotate. Subsequently, the concrete in the placing pipe 4 enters the adding pipe 52, the connecting pipe 63 and the extension pipe 67 in sequence, and the concrete is poured into the rigid frame bridge through the extension pipe 67, thereby controlling the pouring direction.

[0036] like Figures 1-4 , Figure 7 and Figure 9 As shown, the concrete placement device is used to evenly lay the concrete, enabling orderly and neat concrete placement for the rigid frame bridge when the rotating mounting frame 3 rotates. The concrete placement device includes a concrete placement platform 6 fixed to the outer surface of the front end of the rotating mounting frame 3. To control the distance between the concrete placement platform 6 and the auxiliary seat 62, two mirror-distributed hydraulic cylinders 61 are fixedly installed on the inner wall of one end of the concrete placement platform 6. The auxiliary seat 62 is fixedly connected to the end surface of the hydraulic rod of the hydraulic cylinder 61 away from the piston. To allow the laid pipe to rotate, a connecting pipe 63 is rotatably sleeved at the end of the adding pipe 52 through the lower surface of the concrete placement platform 6. To control the rotation of the connecting pipe 63, a transmission gear 64 is fixedly sleeved on the outer surface of the connecting pipe 63. The distance between the auxiliary seat 62 and the concrete placement platform 6 is controlled by the extension and retraction of the hydraulic cylinder 61, thereby controlling the connecting pipe 63 to rotate and connect with the adding pipe 52.

[0037] To control the rotation of the connecting pipe 63, a first reduction motor 65 is fixedly installed on the lower surface of the placing platform 6, and a drive gear 66 that meshes with the transmission gear 64 is fixedly connected to the outer surface of the main shaft of the first reduction motor 65. The first reduction motor 65 controls the rotation of the drive gear 66, and the cooperation between the drive gear 66 and the transmission gear 64 controls the rotation of the connecting pipe 63. To adjust the position of the pouring port, an extension tube 67 is movably sleeved on the inner wall of the connecting pipe 63. To connect the extension tube 67 and the connecting pipe 63, a telescopic rod 68 is fixedly connected to the inner wall of the connecting pipe 63 and one end surface of the extension tube 67. A protective sleeve 69 is provided between the connecting pipe 63 and the extension tube 67. The telescopic rod 68 connects the connecting pipe 63 and the extension tube 67, and the protective sleeve 69 protects the telescopic rod 68 to prevent concrete from affecting it.

[0038] To guide the extension tube 67 and prevent it from tilting, guide rails 610 are fixedly connected to the outer surfaces of both sides of the connecting tube 63. L-shaped retaining rods 611 are slidably inserted into the inner wall of the guide rails 610, and the opposing surfaces of the two L-shaped retaining rods 611 are fixedly connected to the outer surfaces of both sides of the extension tube 67. The guide rails 610 guide the L-shaped retaining rods 611, and the movement of the L-shaped retaining rods 611 drives the extension tube 67 to move within the connecting tube 63. To support the extension tube 67 and prevent it from being subjected to downward forces for a long time, which would affect its service life, load-bearing rods 612 are fixedly connected to the upper surfaces of the two L-shaped retaining rods 611. A guide groove 613 with an arc structure is opened on the lower surface of the auxiliary seat 62, so that the upper outer surface of the load-bearing rod 612 is slidably sleeved with the inner wall of the guide groove 613. The cooperation between the load-bearing rod 612 and the guide groove 613 supports and guides one end of the extension tube 67.

[0039] By setting up a material adaptation device, when small-scale pouring is required, there is no need to control the rotation of the rotating mounting frame 3. Instead, the first reduction motor 65 is started, and the meshing of the drive gear 66 and the transmission gear 64 drives the connecting pipe 63 to rotate, thereby controlling the position of the extension pipe 67. At the same time, the extension pipe 67 extends and retracts within the connecting pipe 63, and the load-bearing rod 612 slides synchronously within the guide groove, keeping the pouring surface on a straight line, thus ensuring the pouring quality.

[0040] like Figures 1-2 , Figures 5-6 and Figure 7As shown, the counterweight device is used to balance the weight added to the front end of the rotating mounting frame 3 when the material adapting device pours concrete for the rigid frame bridge. The counterweight device includes a counterweight box 7 fixed to the lower surface of the rear end of the rotating mounting frame 3. For the installation of the winding column 72 and the shaped gear, a second reduction motor 71 is installed on the inner wall of the middle part of the counterweight box 7. Further, a winding column 72 with steel wire rope wound around its outer surfaces at both ends is installed on the inner wall of the middle part of the counterweight box 7 via bearing seats. The bearing housing is used to install the winding column 72. The free end of the wire rope passes through the top of the rotating mounting frame 3 and is fixedly connected to the upper end of the auxiliary seat 62. One end of the winding column 72 is fixedly connected to the main shaft end of the second reduction motor 71. A travel gear 73 is fixedly sleeved on the outer surface of the middle part of the winding column 72. Limit rails 74 are fixedly connected to the inner walls on both sides of the counterweight box 7. The second reduction motor 71 drives the winding column 72 to wind and unwind the wire rope, while controlling the travel gear 73 to rotate.

[0041] For counterweighting, a counterweight rack 75 is provided on the inner wall of the counterweight box 7, which meshes with the traveling gear 73. The counterweight rack 75 is made of lead. Furthermore, to guide and limit the counterweight rack 75, limiting grooves 76 are provided on both sides of the counterweight rack 75, which slide into the outer surface of one end of the limiting rail 74. To reduce the vertical force on the counterweight rack 75 after it moves to one end, the counterweight rack 75 is designed to be formed by hinged multiple meshing seats 77. The bottom of each pair of meshing seats 77... Hinges 78 and card seats 79 are installed on both sides respectively. The adjacent hinges 78 and card seats 79 are movably connected. After moving to one end, the engagement seats 77 form an angular deflection. The hanging end is supported by the bottom of the counterweight box 7. In order to enable the engagement seats 77 to move smoothly, guide wheels are rotatably connected to both ends of the hinges 78. The rotation of the travel gear 73 drives the counterweight rack 75 to move. The counterweight rack 75 is guided by the limit rail 74, and the gravity point of the engagement seats 77 is controlled by the hinge between the engagement seats 77.

[0042] By setting a counterweight device, the auxiliary seat 62 is controlled to move forward under the drive of the hydraulic cylinder 61. At the same time, the second reduction motor 71 drives the winding column 72 to rotate, loosening the wire rope. The traveling gear 73 rotates, controlling the counterweight rack 75 to move towards the rear end of the rotating mounting frame 3, thereby increasing the weight at the rear end of the rotating mounting frame 3, so that the two ends of the rotating mounting frame 3 remain balanced.

[0043] This rubber-tired concrete placing machine features flexible rotation and a lightweight structure, making concrete pouring quick and easy. It requires only one person to operate, reducing manpower input and ensuring continuous concrete pouring. It can also prevent cold joints during cantilever pouring, resulting in significant economic and quality benefits.

[0044] Working principle: When concrete pouring is required, the balance conveyor 1 drives the device to move and connect the pump pipe of the horizontal pump truck with the placing pipe 4. The horizontal pump truck pumps the concrete into the placing pipe 4. When it is necessary to control the pouring direction, the drive motor 5 drives the worm 51 to rotate. Due to the meshing of the worm 51 and the worm wheel 53, the rotating mounting frame 3 rotates. Subsequently, the concrete in the placing pipe 4 enters the adding pipe 52, the connecting pipe 63 and the extension pipe 67 in sequence, and the concrete is poured into the rigid frame bridge through the extension pipe 67. After concrete is filled into the adding pipe 52, the connecting pipe 63 and the extension pipe 67, the weight at the front end of the rotating mounting frame 3 will suddenly increase. In order to keep the front and rear ends of the rotating mounting frame 3 balanced, the control auxiliary seat 62 moves to the front end under the drive of the hydraulic cylinder 61. At the same time, the second reduction motor 71 drives the winding column 72 to rotate, loosening the wire rope. The traveling gear 73 rotates, controlling the counterweight rack 75 to move to the rear end of the rotating mounting frame 3, thereby increasing the weight at the rear end of the rotating mounting frame 3, so that the two ends of the rotating mounting frame 3 are balanced. When a small-scale pouring is required, there is no need to control the rotation of the rotating mounting frame 3. Instead, the first reduction motor 65 is started, and the drive gear 66 and the transmission gear 64 mesh to drive the connecting pipe 63 to rotate, thereby controlling the position of the extension pipe 67. At the same time, the extension pipe 67 extends and retracts within the connecting pipe 63, and the load-bearing rod 612 slides synchronously within the guide groove to keep the pouring surface on a straight line.

[0045] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A rubber-tired concrete placing machine suitable for cantilever box girder construction, comprising a balanced conveyor vehicle (1), characterized in that: The upper surface of the balance conveyor (1) is fixedly connected to a support platform (2) with a square structure. A rotating mounting frame (3) is installed on the upper surface of the support platform (2). A fabric adapting device is installed at the front end of the rotating mounting frame (3). A fabric tube (4) is provided at the bottom of the balance conveyor (1) and extends through to the upper surface of the support platform (2). A counterweight device is provided on the lower rear end surface of the rotating mounting frame (3). The rotating mounting frame (3) is used to install the fabric adapting device and the counterweight device, and to control the fabric range during the fabric application process. The concrete placement device is used to evenly lay the concrete, so as to achieve orderly and neat concrete placement for the rigid frame bridge when the rotating mounting frame (3) rotates. The concrete placement device includes a concrete placement platform (6) fixed on the outer surface of the front end of the rotating mounting frame (3). The counterweight device is used to balance the weight added to the front end of the rotating mounting frame (3) when the material adapting device pours concrete for the rigid frame bridge. The counterweight device includes a counterweight box (7) fixed to the lower surface of the rear end of the rotating mounting frame (3). The rotating mounting frame (3) includes a worm gear disk (53) rotatably sleeved on the upper surface of the support platform (2). A drive motor (5) is fixedly mounted on one side surface of the support platform (2) via a mounting seat. A worm (51) is fixedly connected to the spindle end face of the drive motor (5) via a bearing seat on the upper surface of the support platform (2). The worm (51) meshes with the worm gear disk (53) for transmission, thereby driving the integrated frame fixedly connected to the upper surface of the worm gear disk (53) to rotate. An adding tube (52) is fixedly sleeved in the middle of the worm gear disk (53) and rotatably sleeved on the outside of the fabric tube (4). Two hydraulic cylinders (61) are fixedly installed on the inner wall of one end of the fabric platform (6) in a mirror arrangement. An auxiliary seat (62) is fixedly connected to the surface of the hydraulic rod of the hydraulic cylinder (61) away from the piston. The end of the adding tube (52) extends through to the lower surface of the fabric platform (6) and is rotatably sleeved with a connecting tube (63). A transmission gear (64) is fixedly sleeved on the outer surface of the connecting tube (63). A first geared motor (65) is fixedly installed on the lower surface of the fabric table (6). A drive gear (66) that meshes with the transmission gear (64) is fixedly connected to the outer surface of the main shaft of the first geared motor (65). An extension tube (67) is movably sleeved on the inner wall of the connecting tube (63). The inner wall of the connecting tube (63) and one end surface of the extension tube (67) are fixedly connected by a telescopic rod (68). A protective sleeve (69) is provided between the connecting tube (63) and the extension tube (67). Guide rails (610) are fixedly connected to the outer surfaces of both sides of the connecting tube (63). An L-shaped retaining rod (611) is slidably inserted into the inner wall of the guide rail (610). The opposing surfaces of the two L-shaped retaining rods (611) are fixedly connected to the outer surfaces of both sides of the extension tube (67). The upper surfaces of the two L-shaped retaining rods (611) are fixedly connected with load-bearing rods (612). The lower surface of the auxiliary seat (62) is provided with a guide groove (613) with an arc structure. The upper outer surface of the load-bearing rod (612) is slidably sleeved with the inner wall of the guide groove (613). The middle inner wall of the counterweight box (7) is equipped with a second reduction motor (71). The middle inner wall of the counterweight box (7) is equipped with a winding column (72) with steel wire rope wound on both outer surfaces through a bearing seat. The free end of the steel wire rope passes through the top of the rotating mounting frame (3) and is fixedly connected to the upper end of the auxiliary seat (62). One end of the winding column (72) is fixedly connected to the main shaft end of the second reduction motor (71). The middle outer surface of the winding column (72) is fixedly sleeved with a traveling gear (73). The inner walls on both sides of the counterweight box (7) are fixedly connected with limit rails (74). The inner wall of the counterweight box (7) is provided with a counterweight rack (75) that meshes with the traveling gear (73). Both sides of the counterweight rack (75) are provided with a limiting groove (76) that slides into the outer surface of one end of the limiting rail (74). The counterweight rack (75) is formed by hinged connection of multiple meshing seats (77). A hinge shaft (78) and a card seat (79) are respectively installed on the bottom sides of each pair of meshing seats (77). The adjacent hinge shafts (78) and the card seats (79) are movably connected. Both ends of the hinge shafts (78) are rotatably connected with guide wheels.

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