Prefabricated pedestal for reinforced concrete post-tensioned prestressed box girder

Abstract

The invention discloses a reinforced concrete post-tensioned prestressed box girder prefabricated pedestal, and relates to the field of concrete box girders, the reinforced concrete post-tensioned prestressed box girder prefabricated pedestal comprises a deck plate, pedestal plates, pedestal ends, a fixed cross beam and a movable cross beam, the deck plate is located between the two pedestal plates, the pedestal ends are integrally formed at the two ends of the pedestal plates, and the fixed cross beam and the movable cross beam are arranged on the deck plate. The fixed cross beam is fixedly installed on one side of the end of the pedestal. According to the precast pedestal for the reinforced concrete post-tensioned prestressed box girder, the slitting cutter plate is integrated in the fixed cross beam and located below the prestressed tendon, the trouble of cutting off by an external cutting machine is omitted, and the prestressed tendon is cut off by using the force applied by the jack, so that the prestressed tendon is more labor-saving and convenient to cut off; and the lifting connecting frame drives the formwork clamping plate and the formwork to rise, so that the formwork is separated from the solidified concrete, and the trouble of manually lifting the formwork for separation is omitted.

Description

Technical Field

[0001] The invention relates to the field of concrete box girders, and in particular to a prefabricated pedestal for reinforced concrete post-tensioned prestressed box girders. Background Art

[0002] The prefabricated pedestal for reinforced concrete post-tensioned prestressed box beam is a prefabricated pedestal for producing prestressed box beams by post-tensioning method. When the prestressed box beam is precast, cement concrete is poured first, and then the prestressed tendons are tensioned to form a prestressed concrete box beam after reaching more than 75% of the design strength. It is an indispensable component in the precast production of prestressed box beams. The Chinese patent with the publication number "CN110843124A" discloses "a pedestal suitable for post-tensioned prefabricated box beams, comprising a main pedestal and end pedestals arranged at both ends of the main pedestal, the main pedestal and the end pedestals are placed on a concrete base; the end pedestals include an inner end pedestal and an outer end pedestal", although it can play the role of "before the prestressed steel strands of the box beam body are tensioned, the connector that fixes the inner end pedestal and the outer end pedestal is removed, and the box beam sealing anchor end is in a suspended state without being subjected to the reaction force caused by the arch of the beam body, thereby ensuring that the relatively weak sealing anchor end of the entire beam body will not be damaged. The prefabricated pedestal has the effect of "shear failure", but when the prefabricated pedestal is in use, after the box girder is prefabricated, the pedestal cannot cut the prestressed tendons, and external tools are required to cut the prestressed tendons. In addition, the position for cutting the prestressed tendons is narrow and the operation is troublesome, which is not convenient for cutting the prestressed tendons after the prefabrication of the box girder. Moreover, when the formwork is installed, the formwork has a certain weight, and it is difficult to adjust the position after installation, which is inconvenient for adjusting the pouring of the box girder. At the same time, after the concrete is tightened, the formwork will adhere to the outside of the box girder. Therefore, when the formwork is lifted and separated from the box girder, the operation is more laborious, which is inconvenient for the separation of the formwork and the box girder. Summary of the invention

[0003] The main purpose of the present invention is to provide a prefabricated pedestal for reinforced concrete post-tensioned prestressed box beams, which can effectively solve the technical problems raised by the background technology.

[0004] To achieve the above object, the technical solution adopted by the present invention is: The cam is secured to the base with a plurality of cams, each of which is secured on a sled and has a plurality of camshafts, each of which is secured on a sled and has a plurality of camshafts, each of which is secured on a sled and has a plurality of camshafts, each of which is secured on a sled and has a plurality of camshafts, each of which is secured on a sled and has a plurality of camshafts, each of which is secured on a sled and has a plurality of camshafts, each of which is secured on a sled and has a plurality of camshafts, each of which is secured on a sled and has a plurality of camshafts, each of which is secured on a sled and has a plurality of camshafts, each of which is secured on a sled and has a plurality of camshafts, each of which is secured on a

[0005] As a further solution of the present invention, two positioning sleeves are fixedly installed on the other side of the movable crossbeam. When the jack is parallel, it is pressed against the other side of the movable crossbeam and fits with the positioning sleeves.

[0006] As a further solution of the present invention, a positioning plate is fixedly installed on one side of the fixed beam, and multiple perforated sleeves are embedded on one side of the positioning plate. Multiple prestressed tendons are penetrated through the fixed beams on both sides. The prestressed tendons pass through the perforated sleeves, and the prestressed tendons are located above the table panel.

[0007] As a further solution of the present invention, the two sides of the table panel are parallel to the side surfaces of the end of the base, and the fixed beams on both sides are fixedly connected to the two sides of the table panel.

[0008] As a further solution of the present invention, the anchor plate structure includes a fixed anchor plate, a steel bar anchor sleeve and a steel bar clip. The fixed anchor plate is fixedly installed on one side of the movable crossbeam, a plurality of steel bar anchor sleeves are inserted into one side of the movable crossbeam, the steel bar clips are inserted into the steel bar anchor sleeves, and the steel bar anchor sleeves are arranged parallel to the perforated sleeves.

[0009] As a further solution of the present invention, a through hole communicating with the steel bar anchor sleeve is opened inside the movable crossbeam, and the prestressed tendons pass through the steel bar anchor sleeve, the steel bar clip and the through hole in the movable crossbeam.

[0010] As a further solution of the present invention, the lifting and cutting structure includes a first lifting sleeve rod, a lifting plate, a connecting rod, a slitting knife plate and a triangular blade. Multiple first lifting sleeve rods are movably sleeved on the outside of the first lifting support rod and the second lifting support rod. The lifting plate is fixedly installed on the outside of the multiple first lifting sleeve rods, the multiple connecting rods are fixedly installed on the lower end of the lifting plate, the slitting knife plate is fixedly installed on the lower end of the connecting rod, the triangular blade is opened on the top surface of the slitting knife plate, and the prestressed tendons are located above the slitting knife plate.

[0011] As a further solution of the present invention, the two sides of the slitting blade are inserted into the lifting slot, the slitting blade is located above the table panel, the slitting blade is arranged in a triangular shape, the prestressed tendons are located in the bottom groove of the slitting blade, and the jack is against the lower end of the lifting plate when it is vertical.

[0012] As a further solution of the present invention, the template positioning structure includes a third lifting support rod, a second lifting sleeve rod, a lifting connecting frame, a template clamp and an adjusting screw. The third lifting support rod is fixedly installed on the upper end of the pedestal end and is located on one side of the first lifting support rod. The second lifting sleeve rod is movably sleeved on the outside of the third lifting support rod. The lifting connecting frame is fixedly installed at one end of the second lifting sleeve rod, and the lifting plate is located below the lifting connecting frame. The template clamp is fixedly installed at one end of the lifting connecting frame, and multiple adjusting screws are threadedly installed on the frame of the template clamp.

[0013] As a further solution of the present invention, the template clamp is located above the table panel, the adjusting screw passes through the template clamp, the top of the lifting connection frame is clamped on the upper end of the lifting plate, and the lifting plate drives the lifting connection frame to move upward.

[0014] Compared with the prior art, the present invention has the following beneficial effects: the slitting blade is integrated into the fixed crossbeam and is located below the prestressed tendon. When the prestressed tendon needs to be cut, the slitting blade is lifted by pulling the lifting plate, and the triangular blade is moved upward to contact the prestressed tendon for cutting, thus eliminating the trouble of cutting with an external cutting machine. When cutting the prestressed tendons, the jack is rotated vertically by rotating the rotating mounting seat, so that the jack is pressed against the lower end of the lifting plate. Therefore, when the jack exerts force, the lifting plate and the cutting blade are pushed upward, and then the triangular blade moves upward to contact the prestressed tendons and cut the prestressed tendons. The force applied by the jack is used to cut the prestressed tendons, making it more labor-saving and convenient to cut the prestressed tendons. When the template installation position needs to be adjusted, when the template is installed on the table panel, the template is located in the template clamping plates on both sides. By rotating the adjusting screw to make it push against the outside of the template, and then using the rotating push of the adjusting screw to push the template to change its position, the template position can be adjusted, which is more convenient for the position adjustment of the template. When the formwork needs to be removed, the top of the lifting connecting frame is stuck on the upper end of the lifting plate, and at the same time, multiple adjusting screws are screwed out and clamped to the formwork, so that the formwork clamp and the formwork are fixed. Therefore, when the lifting plate is raised, the lifting connecting frame is also driven to lift and move, and the lifting connecting frame then drives the formwork clamp and the formwork to lift, so that the formwork is separated from the solidified concrete, eliminating the trouble of manually lifting the formwork to separate, and making it more convenient to separate the formwork and the box beam for use. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1This is a schematic diagram of the overall structure of a prefabricated pedestal for a reinforced concrete post-tensioned prestressed box girder according to the present invention; Figure 2 This is a structural diagram of the prestressed tendons installed in a prefabricated pedestal of a reinforced concrete post-tensioned prestressed box beam of the present invention; Figure 3 It is a partial structural diagram of a prefabricated pedestal of a reinforced concrete post-tensioned prestressed box girder of the present invention; Figure 4 It is a partial structural diagram of the vertical jack in a prefabricated pedestal of a reinforced concrete post-tensioned prestressed box girder of the present invention; Figure 5 It is a side partial structural diagram of a prefabricated pedestal of a reinforced concrete post-tensioned prestressed box girder of the present invention; Figure 6 It is a partial structural diagram of a template positioning structure in a prefabricated pedestal of a reinforced concrete post-tensioned prestressed box girder of the present invention; Figure 7 It is a partial structural diagram of a fixed cross beam in a prefabricated pedestal of a reinforced concrete post-tensioned prestressed box beam of the present invention; Figure 8 The present invention is a partial structural diagram of the lifting and cutting structure in a prefabricated pedestal of a reinforced concrete post-tensioned prestressed box girder.

[0016] In the figure: 1. table panel; 2. base plate; 3. base end; 4. fixed crossbeam; 5. positioning plate; 6. rotating mounting seat; 7. jack; 8. movable crossbeam; 9. positioning sleeve; 10. anchor plate structure; 11. fixed anchor plate; 12. steel anchor sleeve; 13. steel clip; 14. first lifting strut; 15. second lifting strut; 16. lifting and cutting structure; 17. first lifting sleeve rod; 18. lifting plate; 19. connecting rod; 20. slitting knife plate; 21. triangular blade; 22. lifting slot; 23. template positioning structure; 24. third lifting strut; 25. second lifting sleeve rod; 26. lifting connecting frame; 27. template clamp; 28. adjusting screw; 29. ​​prestressed tendon; 30. perforated sleeve. DETAILED DESCRIPTION

[0017] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0018] like Figure 1-Figure 8As shown, a prefabricated pedestal for reinforced concrete post-tensioned prestressed box beam comprises a pedestal panel 1, a pedestal panel 2, a pedestal end 3, a fixed crossbeam 4 and a movable crossbeam 8. The pedestal panel 1 is located between the two pedestal panels 2, the pedestal end 3 is integrally formed at both ends of the pedestal panels 2, the fixed crossbeam 4 is fixedly installed on one side of the pedestal end 3, the movable crossbeam 8 is located on one side of the fixed crossbeam 4, a rotating mounting seat 6 is movably installed at the front and rear of the interior of the fixed crossbeam 4, a jack 7 is fixedly installed on the outer side of the rotating mounting seat 6, an anchor plate structure 10 is fixedly installed on one side of the movable crossbeam 8, a first lifting strut 14 is fixedly installed on the upper end of the pedestal end 3, a second lifting strut 15 is fixedly installed on the upper end of the fixed crossbeam 4, a lifting and cutting structure 16 is arranged on the outer sides of the first lifting strut 14 and the second lifting strut 15, a lifting slot 22 is opened on the inner side of the fixed crossbeam 4, and the upper end of the pedestal end 3 is located on one side of the first lifting strut 14 and is fixedly installed with a template positioning structure 23.

[0019] In this embodiment, two positioning sleeves 9 are fixedly installed on the other side of the movable crossbeam 8. When the jack 7 is parallel, it is pressed against the other side of the movable crossbeam 8 and fits with the positioning sleeve 9. The positioning sleeve 9 has the effect of positioning and placing the parallel state.

[0020] As a further solution of the present invention, a positioning plate 5 is fixedly installed on one side of the fixed beam 4, and a plurality of perforated sleeves 30 are embedded on one side of the positioning plate 5. A plurality of prestressed tendons 29 are penetrated through the fixed beams 4 on both sides. The prestressed tendons 29 pass through the perforated sleeves 30. The prestressed tendons 29 are located above the table panel 1. The prestressed tendons 29 are a component of the box beam and are also the tensioning part of the post-tensioning prestressing.

[0021] As a further solution of the present invention, the two sides of the table panel 1 are parallel to the sides of the base end 3, and the fixed beams 4 on both sides are fixedly connected to the two sides of the table panel 1. The fixed beams 4 have the effect of tightening and positioning the table panel 1 and the base end 3.

[0022] As a further solution of the present invention, the anchor plate structure 10 includes a fixed anchor plate 11, a steel bar anchor sleeve 12 and a steel bar clip 13. The fixed anchor plate 11 is fixedly installed on one side of the movable crossbeam 8. Multiple steel bar anchor sleeves 12 are inserted into one side of the movable crossbeam 8. The steel bar clip 13 is inserted into the steel bar anchor sleeve 12. The steel bar anchor sleeve 12 is arranged parallel to the perforated sleeve 30. The steel bar anchor sleeve 12 and the steel bar clip 13 constitute an anchor.

[0023] As a further solution of the present invention, a through hole is opened inside the movable crossbeam 8 and penetrates the steel anchor sleeve 12. The prestressed tendon 29 passes through the steel anchor sleeve 12, the steel clip 13 and the through hole in the movable crossbeam 8. The prestressed tendon 29 is clamped and fixed by utilizing the contraction of the steel clip 13 in the steel anchor sleeve 12, so that the prestressed tendon 29 is anchored on the fixed anchor plate 11.

[0024] As a further solution of the present invention, the lifting and cutting structure 16 includes a first lifting sleeve rod 17, a lifting plate 18, a connecting rod 19, a slitting blade 20 and a triangular blade 21. Multiple first lifting sleeve rods 17 are movably sleeved on the outside of the first lifting support rod 14 and the second lifting support rod 15. The lifting plate 18 is fixedly installed on the outside of the multiple first lifting sleeve rods 17. Multiple connecting rods 19 are fixedly installed at the lower end of the lifting plate 18. The slitting blade 20 is fixedly installed at the lower end of the connecting rod 19. The triangular blade 21 is opened on the top surface of the slitting blade 20. The prestressed tendon 29 is located above the slitting blade 20. The prestressed tendon 29 does not contact the slitting blade 20 during tensioning.

[0025] As a further solution of the present invention, both sides of the slitting blade 20 are inserted into the lifting slot 22, and the lifting slot 22 plays the effect of lifting and positioning the slitting blade 20. The slitting blade 20 is located above the table panel 1. The slitting blade 20 is arranged in a triangular shape. Through the triangular setting, it can contact the prestressed tendons 29 to the greatest extent and move to cut them. The prestressed tendons 29 are located in the bottom groove of the slitting blade 20, and the jack 7 is against the lower end of the lifting plate 18 when it is vertical.

[0026] As a further solution of the present invention, the template positioning structure 23 includes a third lifting support rod 24, a second lifting sleeve rod 25, a lifting connecting frame 26, a template clamping plate 27 and an adjusting screw 28. The third lifting support rod 24 is fixedly mounted on the upper end of the base end 3 and is located on one side of the first lifting support rod 14. The second lifting sleeve rod 25 is movably sleeved on the outside of the third lifting support rod 24. The lifting connecting frame 26 is fixedly mounted on one end of the second lifting sleeve rod 25, and the lifting plate 18 is located below the lifting connecting frame 26. The template clamping plate 27 is fixedly mounted on one end of the lifting connecting frame 26, and multiple adjusting screws 28 are threadedly mounted on the frame of the template clamping plate 27.

[0027] As a further solution of the present invention, the template clamp 27 is located above the table panel 1, the adjusting screw 28 passes through the template clamp 27, the top of the lifting connecting frame 26 is clamped on the upper end of the lifting plate 18, the lifting plate 18 drives the lifting connecting frame 26 to move upward, and the adjusting screw 28 plays the effect of pushing and clamping the template.

[0028] It should be noted that the present invention is a prefabricated pedestal for a reinforced concrete post-tensioned prestressed box girder. When in use, an isolation paint is applied to the pedestal panel 1, and a steel frame of the box girder is laid. Then, the prestressed tendons 29 are passed through the fixed crossbeam 4 and the movable crossbeam 8, so that the prestressed tendons 29 penetrate into the steel frame. At the same time, the prestressed tendons 29 are connected to the steel anchor sleeve 12 and the steel clip 13 for fixing, so that both sides of the prestressed tendons 29 are fixedly connected to the movable crossbeam 8 and the fixed anchor plate 11. The fixed core mold and the template of the box girder are installed on the pedestal panel 1, and finally, concrete is poured in the template on the pedestal panel 1. After reaching more than 75% of the design strength of the concrete, the movable crossbeam 8 is pushed to one side by the jack 7, so that the prestressed tendons 29 are tensioned and the prestress value is reached. After the concrete solidifies, the template is removed, and the exposed prestressed tendons 29 on both sides are cut off, thereby completing the prefabrication of the prestressed box girder. When it is necessary to cut off the exposed prestressed tendons 29 on both sides, the jack 7 is rotated vertically by rotating the rotating mounting seat 6, so that the jack 7 is pressed against the lower end of the lifting plate 18. Therefore, when the jack 7 exerts force, the lifting plate 18 is pushed to move upward, and the lifting plate 18 then drives the slitting blade 20 to move upward through the connecting rod 19, thereby causing the triangular blade 21 to move upward to contact the prestressed tendons 29 and cut the prestressed tendons 29. When the template installation position needs to be adjusted, when the template is installed on the table panel 1, the template is located in the template clamping plates 27 on both sides, and the adjusting screw 28 is rotated to make it push against the outside of the template, and then the adjusting screw 28 is rotated and pushed out to push the template to change its position, so as to adjust the template position; When the formwork needs to be removed, the top of the lifting connecting frame 26 is stuck on the upper end of the lifting plate 18, and at the same time, multiple adjusting screws 28 are screwed out and clamped to the formwork, so that the formwork clamping plate 27 is fixed to the formwork. Therefore, when the lifting plate 18 is lifted, the lifting connecting frame 26 is also driven to lift and move. The lifting connecting frame 26 then drives the formwork clamping plate 27 and the formwork to lift, so that the formwork is separated from the solidified concrete.

[0029] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A prefabricated pedestal for reinforced concrete post-tensioned prestressed box beam, comprising a pedestal panel (1), a pedestal plate (2), a pedestal end (3), a fixed crossbeam (4) and a movable crossbeam (8), wherein the pedestal panel (1) is located between two pedestal plates (2), the pedestal end (3) is integrally formed at both ends of the pedestal plates (2), the fixed crossbeam (4) is fixedly mounted on one side of the pedestal end (3), and the movable crossbeam (8) is located on one side of the fixed crossbeam (4), characterized in that: A rotating mounting seat (6) is movably mounted at the front and rear of the interior of the fixed crossbeam (4), a jack (7) is fixedly mounted on the outside of the rotating mounting seat (6), an anchor plate structure (10) is fixedly mounted on one side of the movable crossbeam (8), a first lifting strut (14) is fixedly mounted on the upper end of the pedestal end (3), a second lifting strut (15) is fixedly mounted on the upper end of the fixed crossbeam (4), a lifting and cutting structure (16) is arranged on the outer sides of the first lifting strut (14) and the second lifting strut (15), a lifting slot (22) is provided on the inner side of the fixed crossbeam (4), and a template positioning structure (23) is fixedly mounted on the upper end of the pedestal end (3) located on one side of the first lifting strut (14).

2. A prefabricated pedestal for reinforced concrete post-tensioned prestressed box beam according to claim 1, characterized in that: Two positioning sleeves (9) are fixedly mounted on the other side of the movable crossbeam (8); when the jack (7) is parallel, it is pressed against the other side of the movable crossbeam (8) and fits with the positioning sleeves (9).

3. The prefabricated pedestal for reinforced concrete post-tensioned prestressed box beam according to claim 1, characterized in that: A positioning plate (5) is fixedly mounted on one side of the fixed crossbeam (4), a plurality of perforated sleeves (30) are embedded on one side of the positioning plate (5), a plurality of prestressed tendons (29) are penetrated through the fixed crossbeams (4) on both sides, the prestressed tendons (29) pass through the perforated sleeves (30), and the prestressed tendons (29) are located above the table top (1).

4. The prefabricated pedestal for reinforced concrete post-tensioned prestressed box beam according to claim 1, characterized in that: The two sides of the table panel (1) are parallel to the side surfaces of the table base end (3), and the fixed cross beams (4) on the two sides are fixedly connected to the two sides of the table panel (1).

5. The prefabricated pedestal for reinforced concrete post-tensioned prestressed box beam according to claim 3, characterized in that: The anchor plate structure (10) comprises a fixed anchor plate (11), a steel bar anchor sleeve (12) and a steel bar clip (13); the fixed anchor plate (11) is fixedly mounted on one side of the movable crossbeam (8); a plurality of steel bar anchor sleeves (12) are inserted into one side of the movable crossbeam (8); the steel bar clip (13) is inserted into the steel bar anchor sleeve (12); and the steel bar anchor sleeve (12) and the perforated sleeve (30) are arranged in parallel.

6. The prefabricated pedestal for reinforced concrete post-tensioned prestressed box beam according to claim 5, characterized in that: A through hole that penetrates the steel bar anchor sleeve (12) is provided inside the movable crossbeam (8), and the prestressed tendons (29) pass through the steel bar anchor sleeve (12), the steel bar clip (13) and the through hole inside the movable crossbeam (8).

7. The prefabricated pedestal for reinforced concrete post-tensioned prestressed box beam according to claim 3, characterized in that: The lifting and cutting structure (16) comprises a first lifting sleeve rod (17), a lifting plate (18), a connecting rod (19), a slitting blade (20) and a triangular blade (21); a plurality of first lifting sleeve rods (17) are movably sleeved on the outer sides of the first lifting support rod (14) and the second lifting support rod (15); the lifting plate (18) is fixedly mounted on the outer sides of the plurality of first lifting sleeve rods (17); a plurality of connecting rods (19) are fixedly mounted on the lower end of the lifting plate (18); the slitting blade (20) is fixedly mounted on the lower end of the connecting rod (19); the triangular blade (21) is provided on the top surface of the slitting blade (20); and the prestressed tendons (29) are located above the slitting blade (20).

8. The prefabricated pedestal for reinforced concrete post-tensioned prestressed box beam according to claim 7, characterized in that: Both sides of the slitting blade (20) are inserted into the lifting slots (22). The slitting blade (20) is located above the table panel (1). The slitting blade (20) is arranged in a triangular shape. The prestressed tendons (29) are located in the bottom groove of the slitting blade (20). When the jack (7) is vertical, it is supported on the lower end of the lifting plate (18).

9. The prefabricated pedestal for reinforced concrete post-tensioned prestressed box beam according to claim 7, characterized in that: The template positioning structure (23) comprises a third lifting support rod (24), a second lifting sleeve rod (25), a lifting connection frame (26), a template clamping plate (27) and an adjusting screw (28); the third lifting support rod (24) is fixedly mounted on the upper end of the pedestal end (3) and is located on one side of the first lifting support rod (14); the second lifting sleeve rod (25) is movably sleeved on the outer side of the third lifting support rod (24); the lifting connection frame (26) is fixedly mounted on one end of the second lifting sleeve rod (25), and the lifting plate (18) is located below the lifting connection frame (26); the template clamping plate (27) is fixedly mounted on one end of the lifting connection frame (26); and a plurality of adjusting screws (28) are threadedly mounted on the frame of the template clamping plate (27).

10. The prefabricated pedestal for reinforced concrete post-tensioned prestressed box beam according to claim 9, characterized in that: The template clamping plate (27) is located above the table panel (1), the adjusting screw (28) passes through the template clamping plate (27), the top of the lifting connection frame (26) is clamped on the upper end of the lifting plate (18), and the lifting plate (18) drives the lifting connection frame (26) to move upward.

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