A connecting device for fabricated laminated slab

Abstract

The present application relates to the technical field of laminated slab connecting device, specifically to a connecting device for fabricated laminated slab, which comprises a telescopic connecting rod, a length adjusting device, a transverse clamping device and a longitudinal clamping device, the telescopic connecting rod comprises a fixed segment and movable segments at the left and right ends of the fixed segment, the fixed segment is connected with the movable segments through the length adjusting device; the transverse clamping device is arranged inside the movable segments; the longitudinal clamping device is arranged at the bottom of the fixed segment; when the connecting device is used to connect the laminated slab, the transverse clamping device is engaged with the fastening steel bars at the top of the laminated slab, and the longitudinal clamping device is abutted with the keel of the laminated slab; the length adjusting device comprises a first rotating disc, a gear and a rack, the gear is arranged inside the fixed segment, and the length and clamping distance of the telescopic connecting rod are adjusted through the length adjusting device and the clamping device, so that the connecting device can quickly connect adjacent laminated slabs.

Description

Technical Field

[0001] This invention relates to the technical field of composite plate connection devices, specifically a connection device for assembled composite plates. Background Technology

[0002] Composite slabs are a type of composite material consisting of two parts: the slab itself, made from a mixture of siliceous and calcareous materials, mineral fibers, cement, adhesives, and other raw materials, shaped and pressed together; one side of the slab has grooves, while the other side has a frosted surface; and the truss structure, formed by welding the slab itself to steel reinforcement and other components, ensuring a stronger bond between the slab and the building structure during installation. It can be made using various material combinations to create different specifications, sizes, and applications. Composite slabs are known for their wear resistance, water resistance, corrosion resistance, pressure resistance, and high-temperature resistance.

[0003] Chinese utility model patent with publication number CN218466830U, published on February 10, 2023, discloses an assembled composite plate connection structure, belonging to the field of composite plate auxiliary components; it includes two composite plates placed side by side with a gap, and a gap limiting frame is provided between the two composite plates. The gap limiting frame includes a plurality of connectors arranged along the length direction of the composite plates. Each connector includes a middle part, a side part, and a limiting part; the two ends of the middle part are bent vertically upward to form the side part, and the top of the side part is bent vertically outward to form the limiting part; the plurality of connectors are connected by two long rods, and the two long rods are respectively welded and fixed at the inner corner of the connection between the middle part and the side part of each connector.

[0004] The aforementioned patent can improve the efficiency of positioning and installing composite slabs through connectors, but it connects the composite slabs to the trusses through a steel frame, which involves a large amount of work, requires a lot of manpower and costs, and is slow, affecting the construction progress. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a connecting device for assembled composite panels. The device adjusts the length and clamping distance of the telescopic connecting rod through a length adjustment device and a clamping device, enabling the connecting device to quickly connect adjacent composite panels.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A connecting device for prefabricated composite slabs includes a telescopic connecting rod, a length adjusting device, a lateral clamping device, and a longitudinal clamping device. The telescopic connecting rod includes a fixed section and movable sections at both ends of the fixed section. The fixed section is connected to the movable sections via the length adjusting device. The lateral clamping device is located inside the movable sections. The longitudinal clamping device is located at the bottom of the fixed section. When connecting the composite slabs using the connecting device, the lateral clamping device engages with the fastening steel bars at the top of the composite slab, and the longitudinal clamping device abuts against the joists of the composite slab.

[0008] Furthermore, the length adjustment device includes a first turntable, a gear, and a rack. The gear is located inside the fixed section, and the central shaft of the gear passes through the top of the fixed section and is fixed to the bottom of the first turntable. The gear meshes with two racks, and the opposite ends of the two racks are respectively fixed to the opposite ends of the two moving sections.

[0009] Furthermore, the length adjustment device also includes a limiting rod. The first turntable has a through hole in the longitudinal direction, and the top of the fixed section has a groove corresponding to the through hole. After the length adjustment device is adjusted, the bottom end of the limiting rod passes through the through hole and is set in the groove.

[0010] Furthermore, the lateral clamping device includes a limiting hook, a first connecting rod, and a first threaded rod. A cavity is provided inside the moving section, and a strip-shaped hole communicating with the cavity is provided at the top of the moving section. The top of the first connecting rod passes through the strip-shaped hole and is fixed to the bottom of the limiting hook. The side wall of the first connecting rod is slidably connected to the moving section on both sides of the strip-shaped hole. The first threaded rod is disposed in the cavity, with one end passing through the bottom of the first connecting rod and threadedly connected to the first connecting rod. One end of the first threaded rod is rotatably connected to the inner wall of the moving section, and the other end of the first threaded rod extends to the outside of the moving section and is fixed to the second turntable. The limiting hook is U-shaped, and multiple anti-slip plates are symmetrically arranged on the inner wall of the limiting hook.

[0011] Furthermore, an adapter and an elastic sheet are fixed to the back of the anti-slip plate. The adapter is fixed to the mounting groove of the limit hook; the outer end of the elastic sheet abuts against the inner wall of the limit hook.

[0012] Furthermore, the side wall of the first connecting rod is provided with multiple balls, which are in rolling connection with the moving sections on both sides of the strip hole.

[0013] Furthermore, the longitudinal clamping device includes a second connecting rod, a second threaded rod, and a limiting frame. The top of the second connecting rod is fixed to the bottom of the fixed section, and the top of the second threaded rod extends from bottom to top into the interior of the second connecting rod and is threadedly connected to the second connecting rod. A third turntable is fixed to the bottom of the second threaded rod. The limiting frame is slidably connected to the outer periphery of the second threaded rod, and the bottom of the second threaded rod abuts against the top of the third turntable.

[0014] Furthermore, it also includes a linkage device, which comprises a bevel gear, a telescopic rod, and a threaded sleeve. The first bevel gear is fixed to the top of the gear and is coaxial with the gear. One end of the second bevel gear meshes with the first bevel gear, and the other end of the second bevel gear is fixed to one end of the first telescopic rod. The other end of the first telescopic rod is rotatably connected to the side wall of the fixed section. The center of the second turntable is fixed to one end of the slide rod, and the other end of the slide rod is slidably connected to the threaded sleeve. The other end of the threaded sleeve is threadedly connected to one end of the first threaded rod. The first threaded rod and the first telescopic rod are connected by a plug connector. A selective connection device is provided at the connection end between the slide rod and the first threaded rod.

[0015] Furthermore, the linkage device also includes a second telescopic rod, one end of which is rotatably connected to the slide rod, and the other end of which passes through the first threaded rod and is rotatably connected to the first telescopic rod.

[0016] Furthermore, the selected connecting device includes a connector and a connector seat. Along the access direction, the connector consists of a rectangular segment, a threaded segment, and a smooth segment in sequence. The connector seat consists of a rectangular groove and an internal thread from the inside out. When the connector and the connector seat are in the connected state, the rectangular segment enters the rectangular groove, and the smooth segment and the internal thread are in clearance fit.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0018] 1. The present invention adjusts the length and clamping distance of the telescopic connecting rod through a length adjustment device and a clamping device, so that the connecting device can quickly connect adjacent composite plates.

[0019] 2. The present invention adjusts the length of the telescopic connecting rod through a length adjustment device, so that the present invention can be applied to different spacings between different types of composite plates.

[0020] 3. The present invention adjusts the distance between the two limiting hooks by using a transverse clamping device, so that the present invention can be applied to different spacings of fastening steel bars between different types of composite slabs.

[0021] 4. The present invention adjusts the distance between the limiting frame and the telescopic connecting rod by using a longitudinal clamping device, so that the present invention can clamp the composite plate longitudinally, thereby further improving the connection strength.

[0022] 5. The present invention uses a linkage device to enable the limiting hook to have two modes: synchronous adjustment with the moving section and independent adjustment, making the adjustment of the present invention more convenient and efficient.

[0023] 6. The second telescopic rod can support the first threaded rod to prevent the first threaded rod from tilting because one end is not connected to other structures. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of the present invention;

[0025] Figure 2 for Figure 1 Schematic diagram of the structure of region A in the middle;

[0026] Figure 3 This is a schematic diagram of the length adjustment device;

[0027] Figure 4 This is a schematic diagram of the transverse clamping device;

[0028] Figure 5 Diagram showing the positional relationship of the anti-slip plate;

[0029] Figure 6 This is a structural diagram of the anti-slip plate;

[0030] Figure 7 This is a schematic diagram of the longitudinal clamping device;

[0031] Figure 8 This is a schematic diagram of the first possible structure of the linkage device;

[0032] Figure 9 This is a schematic diagram of the second structure of the linkage device;

[0033] Figure 10 This is a schematic diagram of the second telescopic rod;

[0034] Figure 11 A structural diagram showing the selected connecting device;

[0035] Figure 12 This is a schematic diagram showing the connection status of a rectangular segment;

[0036] Figure 13 This is a schematic diagram illustrating the usage state of the present invention.

[0037] The attached figures are labeled as follows:

[0038] 1. Telescopic connecting rod; 11. Fixed section; 111. Groove; 12. Moving section; 2. Length adjustment device; 21. First turntable; 22. Gear; 23. Rack; 24. Limiting rod; 3. Lateral clamping device; 31. Limiting hook; 311. Anti-slip plate; 312. Adapter; 313. Elastic sheet; 32. First connecting rod; 321. Ball bearing; 33. Strip hole; 34. First threaded rod; 35. Second turntable; 4. Longitudinal clamping device; 41. Second connecting rod 42. Second threaded rod; 43. Limiting frame; 44. Third turntable; 51. First bevel gear; 52. Second bevel gear; 53. First telescopic rod; 54. Threaded sleeve; 55. Sliding rod; 56. Selecting connection device; 5611. Smooth section; 5612. Threaded section; 5613. Rectangular section; 5621. Internal thread; 5622. Rectangular groove; 57. Plug; 58. Second telescopic rod; 6. Composite plate; 61. Keel; 7. Truss; 8. Fastening steel bar. Detailed Implementation

[0039] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0040] To better understand the above technical solutions, the following will provide a detailed explanation of the technical solutions in conjunction with the accompanying drawings and specific implementation methods.

[0041] like Figures 1-13 As shown, the connecting device for the prefabricated composite slab in this embodiment includes a telescopic connecting rod 1, a length adjusting device 2, a transverse clamping device 3, and a longitudinal clamping device 4. The telescopic connecting rod 1 includes a fixed section 11 and movable sections 12 at both ends of the fixed section 11. The fixed section 11 is connected to the movable section 12 through the length adjusting device 2. The transverse clamping device 3 is disposed inside the movable section 12. The longitudinal clamping device 4 is disposed at the bottom of the fixed section 11. When the connecting device is used to connect the composite slab 6, the transverse clamping device 3 is engaged with the fastening steel bar 8 at the top of the composite slab 6, and the longitudinal clamping device 4 abuts against the keel 61 of the composite slab 6.

[0042] When using this invention, after the construction personnel place the telescopic connecting rod 1 at the connection point of the two composite plates 6, they first adjust the length of the telescopic connecting rod 1 using the length adjustment device 2 so that the transverse clamping device 3 is aligned with the fastening steel bar 8. Then, by adjusting the transverse clamping device 3, the transverse clamping device 3 is clamped and fixed with the fastening steel bar 8. Next, the longitudinal clamping device 4 is adjusted so that the longitudinal clamping device 4 abuts against the keel 61 of the composite plate 6, thus completing the fixing of the composite plate 6 by this invention.

[0043] Furthermore, the length adjustment device 2 includes a first turntable 21, a gear 22 and a rack 23. The gear 22 is disposed inside the fixed section 11. The central shaft of the gear 22 passes through the top of the fixed section 11 and is fixed to the bottom of the first turntable 21. The gear 22 meshes with the two racks 23. The opposite ends of the two racks 23 are respectively fixed to the opposite ends of the two moving sections 12.

[0044] The two ends of the gear 22 mesh with a rack 23 respectively. By rotating the first turntable 21, the gear 22 is driven to rotate, thereby changing the relative position of the rack 23 and the gear 22. This allows the operator to adjust the length of the rack 23 extending out of the fixed section 11 as needed, which in turn adjusts the length of the telescopic connecting rod 1.

[0045] Furthermore, the length adjustment device 2 also includes a limiting rod 24. The first turntable 21 has a through hole in the longitudinal direction, and the top of the fixed section 11 has a groove 111 corresponding to the through hole. After the length adjustment device 2 is adjusted, the bottom end of the limiting rod 24 is placed in the groove 111 after passing through the through hole.

[0046] When adjusting the length of the telescopic connecting rod 1 using the length adjustment device 2, the limiting rod 24 is removed, allowing the first turntable 21 to rotate freely. After adjusting the telescopic connecting rod 1, the limiting rod 24 is inserted, allowing it to pass through the first turntable 21 and enter the groove 111, thus fixing the first turntable 21 and fixing the length of the telescopic connecting rod 1.

[0047] Furthermore, the transverse clamping device 3 includes a limiting hook 31, a first connecting rod 32, and a first threaded rod 34. The moving section 12 has a cavity inside, and a strip hole 33 communicating with the cavity is opened at the top of the moving section 12. The top of the first connecting rod 32 passes through the strip hole 33 and is fixed to the bottom of the limiting hook 31. The side wall of the first connecting rod 32 is slidably connected to the moving section 12 on both sides of the strip hole 33. The first threaded rod 34 is disposed in the cavity. One end of the first threaded rod 34 passes through the bottom of the first connecting rod 32 and is threadedly connected to the first connecting rod 32. One end of the first threaded rod 34 is rotatably connected to the inner wall of the moving section 12, and the other end of the first threaded rod 34 extends to the outside of the moving section 12 and is fixed to the second turntable 35. The limiting hook 31 is U-shaped, and multiple anti-slip plates 311 are symmetrically arranged on the inner wall of the limiting hook 31.

[0048] The limiting hook 31 is fixedly engaged with the fastening rebar 8. When adjusting the position of the limiting hook 31, the first threaded rod 34 is rotated by rotating the second turntable 35. The first threaded rod 34 drives the first connecting rod 32 to rotate. Since the two sides of the first connecting rod 32 abut against the moving sections 12 on both sides of the strip hole 33, the first connecting rod 32 can move on the first threaded rod 34, thereby adjusting the position of the limiting hook 31. By continuously rotating the second turntable 35, the two limiting hooks 31 can pull the fastening rebar 8 towards the center, which can quickly connect the fastening rebars 8 on the two composite plates 6, improve work efficiency, and ensure the stability of the composite plate 6, which is beneficial to concrete pouring. The anti-slip plate 311 is made of elastic material, which can increase the friction between the limiting hook 31 and the fastening rebar 8, making the connection between the limiting hook 31 and the fastening rebar 8 more secure. The rubber anti-slip plate 311 can fit tightly with the fastening steel bar 8, preventing the limiting hook 31 from sliding on the outside of the fastening steel bar 8 and improving the stability of the limiting hook 31.

[0049] Furthermore, an adapter 312 and an elastic sheet 313 are fixed on the back of the anti-slip plate 311. The adapter 312 is fixed to the mounting groove of the limit hook 31; the outer end of the elastic sheet 313 abuts against the inner wall of the limit hook 31.

[0050] Furthermore, the elastic sheet 313 can support both ends of the anti-slip plate 311, making it easier for the anti-slip plate 311 to be in a balanced state, which is beneficial to the use of the anti-slip plate 311. Through this structure, the friction between the anti-slip plate 311 and the limiting hook 31 is increased, which indirectly increases the friction between the limiting hook 31 and the fastening steel bar 8, making the connection between the limiting hook 31 and the fastening steel bar 8 more secure.

[0051] Furthermore, the side wall of the first connecting rod 32 is provided with a plurality of balls 321, which are tumblingly connected to the moving sections 12 on both sides of the strip hole 33.

[0052] The ball bearing 321 transforms the static friction between the side wall of the first connecting rod 32 and the moving section 12 into rolling friction, reducing the resistance between the first connecting rod 32 and the moving section 12 when the first connecting rod 32 moves, thus facilitating the adjustment of the position of the first connecting rod 32.

[0053] Furthermore, the longitudinal clamping device 4 includes a second connecting rod 41, a second threaded rod 42, and a limiting frame 43. The top of the second connecting rod 41 is fixed to the bottom of the fixed section 11. The top of the second threaded rod 42 extends from bottom to top into the interior of the second connecting rod 41 and is threadedly connected to the second connecting rod 41. A third turntable 44 is fixed to the bottom of the second threaded rod 42. The limiting frame 43 is slidably connected to the outer periphery of the second threaded rod 42, and the bottom of the second threaded rod 42 abuts against the top of the third turntable 44.

[0054] After the adjustment of the transverse clamping device 3 is completed, the position of the telescopic connecting rod 1 is basically fixed. At this time, the position of the limiting frame 43 is adjusted by rotating the third turntable 44, so that the limiting frame 43 clamps the keel 61 from bottom to top, thereby fixing the composite plate 6 longitudinally.

[0055] Furthermore, it also includes a linkage device, which includes a bevel gear, a telescopic rod, and a threaded sleeve 54. The first bevel gear 51 is fixed to the top of the gear 22 and is coaxial with the gear 22. One end of the second bevel gear 52 meshes with the first bevel gear 51, and the other end of the second bevel gear 52 is fixed to one end of the first telescopic rod 53. The other end of the first telescopic rod 53 is rotatably connected to the side wall of the fixed section 11. The center of the second turntable 35 is fixed to one end of the slide rod 55, and the other end of the slide rod 55 is slidably connected to the threaded sleeve 54. The other end of the threaded sleeve 54 is threadedly connected to one end of the first threaded rod 34. The first threaded rod 34 and the first telescopic rod 53 are connected by a connector 57. A selective connection device 56 is provided at the connection end between the slide rod 55 and the first threaded rod 34.

[0056] The length adjustment device 2 and the lateral clamping device 3 can be adjusted synchronously through the linkage device. When the telescopic connecting rod 1 is initially adjusted, the slide rod 55 is not connected to the first threaded rod 34. The first threaded rod 34 is connected to the first telescopic rod 53 through the plug 57. At this time, when the first turntable 21 is rotated, the gear 22 rotates, which drives the rack 23 to rotate, thereby adjusting the length of the telescopic connecting rod 1. At the same time, the first bevel gear 51 rotates, which drives the second bevel gear 52 to rotate, and the second bevel gear 52 drives the first telescopic rod 53 to rotate. 3. Rotation causes the first telescopic rod 53 to rotate, which in turn drives the first threaded rod 34 to rotate. The first threaded rod 34 then drives the first connecting rod 32 to move, thereby causing the limiting hook 31 to move. If the position of the limiting hook 31 after initial adjustment does not meet the requirements, the second turntable 35 can be rotated, causing the second turntable 35 to drive the sliding rod 55 to connect with the first threaded rod 34 through the selection connecting device 56. By pulling the second turntable 35 outward, the first threaded rod 34 can be separated from the first telescopic rod 53. Then, the position of the limiting hook 31 can be adjusted by rotating the second turntable 35.

[0057] Furthermore, the linkage device also includes a second telescopic rod 58, one end of which is rotatably connected to the slide rod 55, and the other end of which passes through the first threaded rod 34 and is rotatably connected to the first telescopic rod 53.

[0058] When the slide rod 55 is not connected to the first threaded rod 34, the slide rod 55 may tilt; when the first threaded rod 34 is not connected to the first telescopic rod 53, the first threaded rod 34 may tilt. By setting the second telescopic rod 58, the second telescopic rod 58 limits the slide rod 55 and the first threaded rod 34 to prevent the slide rod 55 or the first threaded rod 34 from tilting.

[0059] Furthermore, the connecting device 56 includes a connector and a connecting seat. Along the access direction, the connector consists of a rectangular segment 5613, a threaded segment 5612, and a smooth segment 5611. The connecting seat consists of a rectangular groove 5622 and an internal thread 5621 from the inside out. When the connector and the connecting seat are in the connected state, the rectangular segment 5613 enters the rectangular groove 5622, and the smooth segment 5611 and the internal thread 5621 are in clearance fit.

[0060] During the connection process between the connector and the connector seat, because the diameter of the rectangular segment 5613 is smaller than the diameter of the internal thread 5621, the rectangular segment 5613 does not contact the internal thread 5621. When the threaded segment 5612 contacts the internal thread 5621, the connector can be rotated by rotating the slide rod 55, causing the threaded segment 5612 to gradually pass through the internal thread 5621. After the threaded segment 5612 has completely passed through the internal thread 5621, the rectangular segment 5613 enters the rectangular groove 5622. At this point, rotating the slide rod 55 will allow the connector to pass through. The rectangular segment 5613 of the head drives the first threaded rod 34 to rotate, which serves to adjust the position of the limit hook 31. Since the threaded segment 5612 is not connected to the internal thread 5621 at this time, neither the forward nor reverse sliding rod 55 will unscrew the connector. In this state, pulling the second turntable 35 outward will pull the plug 57 out of the first telescopic rod 53, which will separate the first threaded rod 34 and the first telescopic rod 53. Only when the second turntable 35 is pulled outward and rotated at the same time will the sliding rod 55 cause the connector to separate from the connector seat.

[0061] The method of using this invention is as follows:

[0062] 1. Install and place the composite plate 6;

[0063] 2. Use the length adjustment device 2 to adjust the length of the telescopic connecting rod 1, and place the telescopic connecting rod 1 at the connection of the two stacked plates 6; while adjusting the length of the telescopic connecting rod 1, the position of the limiting hook 31 also changes;

[0064] 3. Adjust the position of the limiting hook 31 by using the transverse clamping device 3 so that the limiting hook 31 clamps and secures the reinforcing bar 8;

[0065] 4. After placing the limiting frame 43 at the bottom of the keel 61, rotate the third turntable 44. The third turntable 44 can drive the second threaded rod 42 to move upward, thereby making the limiting frame 43 fit tightly with the keel 61, further improving the stability of the telescopic connecting rod 1.

[0066] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A connecting device for prefabricated composite slabs, characterized in that, The device includes a telescopic connecting rod (1), a length adjustment device (2), a transverse clamping device (3), and a longitudinal clamping device (4). The telescopic connecting rod (1) includes a fixed section (11) and movable sections (12) at the left and right ends of the fixed section (11). The fixed section (11) is connected to the movable section (12) through the length adjustment device (2). The transverse clamping device (3) is located inside the movable section (12). The longitudinal clamping device (4) is located at the bottom of the fixed section (11). When the connecting device is used to connect the composite plate (6), the transverse clamping device (3) is engaged with the fastening steel bar (8) at the top of the composite plate (6), and the longitudinal clamping device (4) abuts against the keel (61) of the composite plate (6). The length adjustment device (2) includes a first turntable (21), a gear (22) and a rack (23). The gear (22) is located inside the fixed section (11). The central shaft of the gear (22) passes through the top of the fixed section (11) and is fixed to the bottom of the first turntable (21). The gear (22) meshes with two racks (23). The opposite ends of the two racks (23) are respectively fixed to the opposite ends of the two moving sections (12). The transverse clamping device (3) includes a limiting hook (31), a first connecting rod (32) and a first threaded rod (34). The moving section (12) has a cavity inside. The top of the moving section (12) has a strip hole (33) that communicates with the cavity. The top of the first connecting rod (32) passes through the strip hole (33) and is fixed to the bottom of the limiting hook (31). The side wall of the first connecting rod (32) is slidably connected to the moving section (12) on both sides of the strip hole (33). The first threaded rod (34) is set in the cavity. One end of the first threaded rod (34) passes through the bottom of the first connecting rod (32) and is threadedly connected to the first connecting rod (32). One end of the first threaded rod (34) is rotatably connected to the inner wall of the moving section (12). The other end of the first threaded rod (34) extends to the outside of the moving section (12) and is fixed to the second turntable (35). The limiting hook (31) is U-shaped. Multiple anti-slip plates (311) are symmetrically arranged on the inner wall of the limiting hook (31). The longitudinal clamping device (4) includes a second connecting rod (41), a second threaded rod (42), and a limiting frame (43). The top of the second connecting rod (41) is fixed to the bottom of the fixed section (11). The top of the second threaded rod (42) extends from bottom to top into the interior of the second connecting rod (41) and is threadedly connected to the second connecting rod (41). A third turntable (44) is fixed to the bottom of the second threaded rod (42). The limiting frame (43) is slidably connected to the outer periphery of the second threaded rod (42), and the bottom of the second threaded rod (42) abuts against the top of the third turntable (44).

2. The connecting device for prefabricated composite plates according to claim 1, characterized in that, The length adjustment device (2) also includes a limiting rod (24). The first turntable (21) has a through hole in the longitudinal direction, and the top of the fixed section (11) has a groove (111) corresponding to the through hole. After the length adjustment device (2) is adjusted, the bottom end of the limiting rod (24) is placed in the groove (111) after passing through the through hole.

3. The connecting device for prefabricated composite plates according to claim 1, characterized in that, An adapter (312) and an elastic sheet (313) are fixed on the back of the anti-slip plate (311). The adapter (312) is fixed to the mounting groove of the limit hook (31). The outer end of the elastic sheet (313) abuts against the inner wall of the limit hook (31).

4. The connecting device for prefabricated composite slabs according to claim 1, characterized in that, The first connecting rod (32) has multiple balls (321) on its side wall, and the balls (321) are in rolling connection with the moving sections (12) on both sides of the strip hole (33).

5. The connecting device for prefabricated composite plates according to claim 1, characterized in that, It also includes a linkage device, which includes a bevel gear, a telescopic rod and a threaded sleeve (54). The first bevel gear (51) is fixed to the top of the gear (22) and is coaxial with the gear (22). One end of the second bevel gear (52) meshes with the first bevel gear (51), and the other end of the second bevel gear (52) is fixed to one end of the first telescopic rod (53). The other end of the first telescopic rod (53) is rotatably connected to the side wall of the fixed section (11). The center of the second turntable (35) is fixed to one end of the slide rod (55), and the other end of the slide rod (55) is slidably connected to the threaded sleeve (54). The other end of the threaded sleeve (54) is threadedly connected to one end of the first threaded rod (34). The first threaded rod (34) and the first telescopic rod (53) are connected by a plug (57). A selection connection device (56) is provided at the connection end of the slide rod (55) and the first threaded rod (34).

6. The connecting device for assembled composite slabs according to claim 5, characterized in that, The linkage device also includes a second telescopic rod (58), one end of which is rotatably connected to the slide rod (55), and the other end of which passes through the first threaded rod (34) and is rotatably connected to the first telescopic rod (53).

7. The connecting device for prefabricated composite plates according to claim 5, characterized in that, The selected connecting device (56) includes a connector and a connecting seat. Along the access direction, the connector consists of a rectangular section (5613), a threaded section (5612), and a smooth section (5611). The connecting seat consists of a rectangular groove (5622) and an internal thread (5621) from the inside to the outside. When the connector and the connecting seat are in the connected state, the rectangular section (5613) enters the rectangular groove (5622), and the smooth section (5611) and the internal thread (5621) are in clearance fit.

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