A construction hoisting tool

Abstract

This utility model relates to the field of construction hoisting technology, and in particular to a construction hoisting tool, including a crossbeam. Both the left and right sides of the crossbeam have vertically penetrating slots. A transmission mechanism is installed at the top of the crossbeam and at the two slots. A clamping mechanism is installed in each of the two slots, and both clamping mechanisms are connected to the transmission mechanism. The two clamping mechanisms are symmetrically distributed on the crossbeam. Lifting rings are installed at both ends of the top of the crossbeam. This utility model, through a locking insert, can further lock the bottom ends of the first and second jaw clamps after they have clamped the material, forming a double guarantee. Even if the drive mechanism fails unexpectedly, it can prevent the material from loosening and falling, greatly reducing the safety risks during construction hoisting. The transmission mechanism enables coordinated control of the clamping mechanisms, laying a solid foundation for subsequent flexible adjustment of the clamping state and adaptation to different material hoisting needs. The overall structure is simple and highly practical.

Description

Technical Field

[0001] This utility model relates to the field of construction hoisting technology, and in particular to a construction hoisting tool. Background Technology

[0002] In the construction industry, material hoisting is a core link throughout the entire construction process, involving the vertical and horizontal transfer of various heavy objects such as steel bars, pipes, and prefabricated components. Its efficiency and safety directly affect the progress of the project and the safety of construction workers. Currently, the mainstream construction hoisting tools on the market mainly rely on traditional hooks, wire rope binding, or simple clamping structures to hoist construction pipes. In practical applications, this has revealed many technical defects, making it difficult to meet the needs of modern construction for efficiency, stability, and versatility.

[0003] While existing claw-type hoisting tools have improved the convenience of material clamping, their safety protection mechanisms are significantly inadequate. Most clamping structures rely solely on the self-locking function of the drive mechanism to secure materials, lacking independent secondary locking devices. If the clamping components suddenly lose their clamping force and loosen, the materials may fall from a height, causing serious safety accidents such as equipment damage, project shutdowns, and even personal injury. Furthermore, the clamping spacing and angle of existing claw-type tools are mostly fixed designs, which cannot be flexibly adjusted according to the size and shape of the materials. This results in poor applicability to different specifications of building components, significantly reducing construction efficiency and increasing equipment investment costs. Therefore, this application proposes a construction hoisting tool. Utility Model Content

[0004] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a construction hoisting tool to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a construction hoisting tool, comprising: The crossbeam has through slots on both the left and right sides. The transmission mechanism is located at the top of the crossbeam and at the two slots; The clamping mechanism is provided in two sets, each located in one of the two slots. Both clamping mechanisms are connected to the transmission mechanism and are symmetrically distributed on the crossbeam. The lifting rings are provided in two sets and are installed at both ends of the top of the crossbeam.

[0006] Optionally, the clamping mechanism includes a movable block, rollers, and a clamping assembly. The movable block has two openings on its side, and the two openings on the movable block are fitted into the slots on the crossbeam. The movable block has two openings on its top, and the two openings are connected to the two openings respectively. A fixed shaft is installed in each of the two openings. There are two rollers, which are located in the two openings and are rotatably fitted onto the corresponding fixed shafts. The bottoms of the two rollers abut against the top of the crossbeam. The clamping assembly is installed at the bottom of the movable block.

[0007] Optionally, the clamping assembly includes a worm, a first jaw clamp, a second jaw clamp, and a worm wheel. Bearing seats are fixedly installed at both ends of the bottom of the moving block. The two ends of the worm are respectively inserted into the two bearing seats, and the two ends of the worm are respectively provided with positive and negative threads. Hinge frames are installed at both ends of the bottom of the moving block. The bottom ends of the first jaw clamp and the second jaw clamp are both set as inwardly curved arcs, and notches are opened at the top of the first jaw clamp and the second jaw clamp. Two worm wheels are provided and are respectively installed in the two notches. Through holes are opened on the side of the top of the first jaw clamp and the second jaw clamp and at the center of the worm wheel. The through holes at the top of the first jaw clamp and the second jaw clamp are respectively sleeved on the two hinge frames. The worm wheels at the top of the first jaw clamp and the second jaw clamp are respectively engaged with the positive and negative threads at both ends of the worm.

[0008] Optionally, the clamping assembly also includes a first bevel gear, a second motor, a second bevel gear and a locking plug. The first bevel gear is fixedly installed on the right end of the worm gear, the second motor is fixedly installed on the right side of the moving block, the second bevel gear is fixedly installed on the output end of the second motor and meshes with the first bevel gear, the bottom end of the first jaw has a notch, and the locking plug is located in the notch between the bottom end of the second jaw and the bottom end of the first jaw.

[0009] Optionally, the locking plug includes a fixed rod, a limiting head, a collar, and a limiting block. The fixed rod is installed at the bottom end of the second jaw clamp, and the limiting head is installed at the end of the fixed rod away from the second jaw clamp. The edge of the limiting head near the first jaw clamp is rounded. The collar is movably sleeved on the fixed rod. The side wall of the collar away from the limiting head is sloped. A first spring sleeved on the fixed rod is fixedly connected between the collar and the bottom end of the second jaw clamp. Grooves are provided on both sides of the inner wall of the notch. Two limiting blocks are provided and are respectively inserted into the two grooves. A second spring is fixedly connected between the two limiting blocks and the inner end of the corresponding groove. The ends of the two limiting blocks away from the second springs protrude from the grooves. The side of the two limiting blocks located in the notch and near the second jaw clamp is sloped. The limiting head at the end of the fixed rod can extend into the notch, and the limiting block can abut against the side of the limiting head near the collar.

[0010] Optionally, the transmission mechanism includes a screw, a first gear, a first motor, and a second gear. Each of the two slots has a shaft groove at one end, and a bearing is installed in each of the two shaft grooves. A connecting insertion hole is formed between the two slots, through which the screw is inserted. Both ends of the screw are respectively inserted into the two bearings. The portions of the screw located in the two slots are respectively provided with positive and negative threads. A gear groove is formed at the center of the crossbeam. The first gear is located in the gear groove and rotatably fitted onto the center of the screw, with the top of the first gear extending out of the gear groove. The first motor is mounted on the top of the crossbeam, and the second gear is mounted on the output end of the first motor, with the bottom of the second gear meshing with the top of the first gear.

[0011] Optionally, a screw hole is provided at the center of the side of each of the two movable blocks, and the screw holes on the side of the two movable blocks are respectively threaded onto the positive thread and the negative thread at both ends of the screw rod.

[0012] The beneficial effects of this utility model are: The clamping assembly achieves initial clamping and fixation through the meshing of the worm gear and worm wheel. At the same time, the locking plug can further lock the bottom ends of the first and second jaw clamps. When the first and second jaw clamps the material, the limiting head at the end of the fixing rod will extend into the notch of the first jaw clamp. The limiting block will pop out under the action of the second spring and press against the side of the limiting head to form a physical lock. Even if the drive mechanism fails unexpectedly and the clamping force is lost instantly, the locking plug can still firmly fix the material, fundamentally preventing equipment damage, project stoppage and personnel injury caused by falling from heights, and meeting the core safety requirements of construction.

[0013] The bottom ends of the first and second jaws in the clamping assembly are designed to be curved inwards, allowing them to fit closely to the surface of common building materials such as round pipes. This increases the contact area while preventing localized stress concentration that could cause the material to slip. The edge of the limiting head near the first jaw in the locking plug is also designed to be curved, and the side of the limiting block located inside the notch is designed to be beveled. This design ensures that the limiting head can smoothly extend into the notch to lock, and also allows the limiting block to be squeezed by the slope of the collar during unlocking, achieving convenient operation while balancing safety and smooth operation.

[0014] The transmission mechanism drives two sets of clamping mechanisms to move synchronously towards or away from each other through the forward and reverse rotation of the screw, thereby achieving precise adjustment of the clamping distance. The parts of the screw located in the two slots are respectively set with positive and negative threads, which mesh with the screw holes of the two moving blocks. When the first motor drives the second gear to rotate, and then drives the screw to rotate through the first gear, the two sets of clamping mechanisms can move smoothly along the slots of the crossbeam. The distance adjustment range is not limited by the fixed structure and can adapt to building materials of different lengths and specifications, from small steel bars to large precast components. Attached Figure Description

[0015] Other features, objects, and advantages of this invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings: Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a cross-sectional structural diagram of the connection between the crossbeam and the transmission mechanism of this utility model; Figure 3 This is a schematic diagram of the clamping mechanism of this utility model; Figure 4 This is a side view of the connection between the movable block and the crossbeam of this utility model; Figure 5 This is a schematic diagram of the clamping assembly of this utility model; Figure 6 This is a schematic diagram of the structure of the first and second jaw clamps of this utility model; Figure 7 This is a schematic diagram of the structure of the second claw clamp connected to the fixing rod, the limiting head, and the collar of this utility model; Figure 8 This is a cross-sectional structural diagram of the connection between the first claw clamp and the limiting block of this utility model; In the picture: 1. Crossbeam; 2. Transmission mechanism; 3. Clamping mechanism; 4. Clamping assembly; 5. Locking insert; 11. Lifting ring; 12. Groove; 21. Screw; 22. Bearing; 23. First gear; 24. First motor; 25. Second gear; 31. Moving block; 32. Through port; 33. Screw hole; 34. Roller; 35. Hinge frame; 41. Bearing housing; 42. Worm gear; 43. First bevel gear; 44. Second motor; 45. Second bevel gear; 46. First jaw clamp; 47. Second jaw clamp; 48. Worm wheel; 49. Notched groove; 410. Through hole; 461. Gap; 51. Fixing rod; 52. Limiting head; 53. Collar; 54. First spring; 55. Limiting block; 56. Second spring. Detailed Implementation

[0016] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0017] Please see Figures 1-8This utility model provides a technical solution: a construction hoisting tool, including a crossbeam 1. The crossbeam 1 has through slots 12 on both the left and right sides. A transmission mechanism 2 is provided at the top of the crossbeam 1 and at the two slots 12. A clamping mechanism 3 is provided in each of the two slots 12, and both clamping mechanisms 3 are connected to the transmission mechanism 2. The two clamping mechanisms 3 are symmetrically distributed on the crossbeam 1. Lifting rings 11 are installed at both ends of the top of the crossbeam 1. The crossbeam 1 provides stable support. The symmetrically distributed clamping mechanisms 3, together with the transmission mechanism 2, realize the coordinated control of the clamping mechanisms 3, laying a solid foundation for subsequent flexible adjustment of the clamping state and adaptation to different material hoisting needs. The overall structure is simple and highly practical, and can meet the basic functional requirements of material hoisting in construction.

[0018] like Figure 3 and Figure 4 As shown, the clamping mechanism 3 includes a movable block 31, rollers 34, and a clamping assembly 4. The movable block 31 has two openings 32 on its side, which are fitted onto slots 12 on the crossbeam 1. The movable block 31 has two openings on its top, each communicating with one of the openings 32. Fixed shafts are installed in each of the two openings. Two rollers 34 are provided, each located within one of the two openings and rotatably fitted onto the corresponding fixed shaft. The bottoms of the two rollers 34 abut against the crossbeam 1. At the top, the clamping component 4 is installed at the bottom of the moving block 31. The moving block 31 is fitted into the slot 12 of the crossbeam 1 through the through-hole 32. With the help of the roller 34 at the top, the moving block 31 can move smoothly along the crossbeam 1, reducing frictional resistance during movement and facilitating adjustment of the clamping position. At the same time, installing the clamping component 4 at the bottom of the moving block 31 allows the clamping component 4 to be flexibly adjusted with the moving block 31, which provides convenience for the subsequent precise clamping of materials of different positions and specifications, and enhances the adaptability of the tool in actual hoisting operations.

[0019] like Figure 3 , Figure 5 and Figure 6As shown, the clamping assembly 4 includes a worm gear 42, a first jaw clamp 46, a second jaw clamp 47, and a worm wheel 48. Bearing seats 41 are fixedly installed at both ends of the bottom of the moving block 31. The two ends of the worm gear 42 are respectively inserted into the two bearing seats 41, and both ends of the worm gear 42 are respectively provided with positive and negative threads. Hinge frames 35 are installed at both ends of the bottom of the moving block 31. The bottom ends of the first jaw clamp 46 and the second jaw clamp 47 are both designed as inwardly curved arcs, and notches 49 are opened at the top ends of both the first jaw clamp 46 and the second jaw clamp 47. Two worm wheels 48 are provided and respectively installed in the two notches 49. Through holes 410 are opened on the side of the top ends of the first jaw clamp 46 and the second jaw clamp 47 and at the center of the worm wheel 48, and the through holes 410 at the top ends of the first jaw clamp 46 and the second jaw clamp 47 are respectively fitted with… Attached to two hinged frames 35, the worm gears 48 at the top of the first jaw clamp 46 and the second jaw clamp 47 are respectively engaged with the positive and negative threads at both ends of the worm 42. The positive and negative threads at both ends of the worm 42 are engaged with the worm gears 48 at the top of the first jaw clamp 46 and the second jaw clamp 47. When the worm 42 rotates, it can drive the first jaw clamp 46 and the second jaw clamp 47 to rotate synchronously in opposite directions, realizing the clamping and releasing of materials. Moreover, the bottom ends of the first jaw clamp 46 and the second jaw clamp 47 are designed to be curved inward, which can better fit with the surface of common building materials such as circles, increase the contact area, improve the clamping stability, and prevent materials from slipping due to insecure clamping during hoisting. At the same time, through the cooperation of the hinged frame 35 and the through hole 410, it is ensured that the first jaw clamp 46 and the second jaw clamp 47 rotate flexibly, further optimizing the clamping effect.

[0020] like Figure 3 , Figure 5 and Figure 6 As shown, the clamping assembly 4 also includes a first bevel gear 43, a second motor 44, a second bevel gear 45, and a locking plug 5. The first bevel gear 43 is fixedly installed on the right end of the worm gear 42, the second motor 44 is fixedly installed on the right side of the moving block 31, and the second bevel gear 45 is fixedly installed on the output end of the second motor 44, and the second bevel gear 45 meshes with the first bevel gear 43. The bottom end of the first jaw clamp 46 has a notch 461. The locking plug 5 is set in the notch 461 at the bottom end of the second jaw clamp 47 and the bottom end of the first jaw clamp 46. The second motor 44 drives the second bevel gear 45 to rotate, and then meshes with the first bevel gear 43 and the worm gear 42, thereby realizing the control of the clamping action. The locking plug 5 can further lock the bottom ends of the first jaw clamp 46 and the second jaw clamp 47 after they clamp the material, forming a double protection to prevent the material from falling off and reducing the safety risks during the construction hoisting process.

[0021] like Figures 4-8As shown, the locking plug 5 includes a fixing rod 51, a limiting head 52, a collar 53, and a limiting block 55. The fixing rod 51 is installed at the bottom end of the second claw clamp 47, and the limiting head 52 is installed at the end of the fixing rod 51 away from the second claw clamp 47. The edge of the limiting head 52 near the end of the first claw clamp 46 is rounded. The collar 53 is movably sleeved on the fixing rod 51. The side wall of the collar 53 away from the limiting head 52 is sloped. A first spring 54 sleeved on the fixing rod 51 is fixedly connected between the collar 53 and the bottom end of the second claw clamp 47. Grooves are provided on both sides of the inner wall of the notch 461. Two positioning blocks 55 are provided and are respectively inserted into two grooves. A second spring 56 is fixedly connected between the inner end of each positioning block 55 and the corresponding groove. The ends of the two positioning blocks 55 away from the second spring 56 protrude from the grooves. The side of the two positioning blocks 55 located in the notch 461 and near the second claw 47 is set as an inclined surface. The limiting head 52 at the end of the fixing rod 51 can extend into the notch 461, and the positioning block 55 can abut against the side of the limiting head 52 near the collar 53. The detailed structural design of the locking plug 5 takes into account both the reliability of locking and the convenience of operation. The fixing rod 51, the limiting head 55, the limiting head 56 ... The engagement of head 52, collar 53, and limiting block 55 allows the limiting head 52 to smoothly extend into notch 461 when the first jaw clamp 46 and the second jaw clamp 47 are clamping the material. The limiting block 55, under the elastic force of the second spring 56, pops out and presses against the limiting head 52. The elastic force of the second spring 56 is only responsible for pushing the limiting block 55 out of the groove. The limiting block 55's obstruction of the limiting head 52 achieves a secure lock. During unlocking, the first jaw clamp 46 and the second jaw clamp 47 are further clamped (the size of the clamped material is within the allowable range of the clamping assembly 4). The inclined surface of the limiting block 55 slides over the collar 53 and presses against it. On the slope, when the first jaw 46 and the second jaw 47 are released, the two limiting blocks 55 press the slope of the collar 53, causing it to move along the direction of the fixed rod 51 and engage with the limiting head 52. At this time, the collar 53 cannot move, while the limiting blocks 55 can slide over the slope of the collar 53 and disengage from the limiting head 52, thereby unlocking the first jaw 46 and the second jaw 47. The arc-shaped design of the edge of the limiting head 52 and the inclined design of the limiting blocks 55 reduce the collision and wear between components, extend the service life, and ensure that the locking and unlocking process is smooth and does not affect the efficiency of the hoisting operation.

[0022] like Figure 1 and Figure 2As shown, the transmission mechanism 2 includes a screw 21, a first gear 23, a first motor 24, and a second gear 25. Each of the two slots 12 has a shaft groove at one of its separated ends, and a bearing 22 is installed in each of the two shaft grooves. A connecting insertion hole is formed between the two slots 12, through which the screw 21 is inserted. Both ends of the screw 21 are respectively inserted into the two bearings 22. The portions of the screw 21 located in the two slots 12 are respectively provided with positive and negative threads. A gear groove is formed at the center of the crossbeam 1. The first gear 23 is located in the gear groove and rotatably sleeved on the center of the screw 21, with the top end of the first gear 23 extending out of the gear groove. The first motor 24 is installed... Mounted on the top of the crossbeam 1, the second gear 25 is installed at the output end of the first motor 24, and the bottom of the second gear 25 meshes with the top of the first gear 23. The two ends of the screw 21 are respectively engaged with the bearings 22 in the slot 12, ensuring the stability of the screw 21 rotation. The positive and negative thread design at both ends of the screw 21, together with the first motor 24, drives the screw 21 to rotate through gear transmission, which can drive the two sets of clamping mechanisms 3 to move synchronously in opposite directions or in opposite directions, accurately adjust the distance between the two sets of clamping mechanisms 3, and quickly adapt to building materials of different lengths and volumes. Various materials can be hoisted without changing tools, reducing construction costs and improving construction efficiency.

[0023] like Figure 1 , Figure 2 and Figure 3 As shown, each of the two moving blocks 31 has a screw hole 33 at the center of its side. The screw holes 33 on the sides of the two moving blocks 31 are respectively threaded onto the positive thread and the negative thread at both ends of the screw rod 21. The two moving blocks 31 are respectively engaged with the positive and negative threads at both ends of the screw rod 21 through the screw holes 33. When the screw rod 21 rotates, it can ensure that the two moving blocks 31 move precisely and synchronously towards or away from each other along the slot 12 on the crossbeam 1. By adjusting the distance between the two sets of clamping mechanisms 3, the limitations in the use of the device can be reduced.

[0024] Although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A construction hoisting tool, characterized in that include: The crossbeam (1) has slots (12) that run vertically through the left and right sides. The transmission mechanism (2) is located at the top of the crossbeam (1) and at the two slots (12); The clamping mechanism (3) is provided in two sets and is located in two slots (12) respectively. Both clamping mechanisms (3) are connected to the transmission mechanism (2), and the two clamping mechanisms (3) are symmetrically distributed on the crossbeam (1). The lifting rings (11) are provided in two sets and are respectively installed at both ends of the top of the crossbeam (1).

2. A construction hoisting tool according to claim 1, characterized in that The clamping mechanism (3) includes a moving block (31), rollers (34) and a clamping assembly (4). The moving block (31) has two openings (32) on its side, and the two openings (32) on the moving block (31) are fitted into the slots (12) on the crossbeam (1). The moving block (31) has two openings on its top, and the two openings are connected to the two openings (32) respectively. A fixed shaft is installed in each of the two openings. There are two rollers (34), and the two rollers (34) are located in the two openings and rotated on the corresponding fixed shafts. The bottom of the two rollers (34) abuts against the top of the crossbeam (1). The clamping assembly (4) is installed at the bottom of the moving block (31).

3. A construction hoisting tool according to claim 2, characterized in that, The clamping assembly (4) includes a worm (42), a first jaw (46), a second jaw (47), and a worm wheel (48). Bearing seats (41) are fixedly installed at both ends of the bottom of the moving block (31). The two ends of the worm (42) are respectively inserted into the two bearing seats (41), and the two ends of the worm (42) are respectively provided with positive and negative threads. Hinge frames (35) are installed at both ends of the bottom of the moving block (31). The bottom ends of the first jaw (46) and the second jaw (47) are both set as inwardly curved arcs. The top of the second jaw (47) is provided with a notch (49). There are two worm gears (48) and they are installed in the two notches (49) respectively. Through holes (410) are provided on the side of the top of the first jaw (46) and the second jaw (47) and at the center of the worm gear (48). The through holes (410) at the top of the first jaw (46) and the second jaw (47) are respectively sleeved on the two hinge frames (35). The worm gears (48) at the top of the first jaw (46) and the second jaw (47) are respectively engaged with the positive and negative threads at both ends of the worm (42).

4. A construction hoisting tool according to claim 3, characterized in that, The clamping assembly (4) further includes a first bevel gear (43), a second motor (44), a second bevel gear (45), and a locking plug (5). The first bevel gear (43) is fixedly installed on the right end of the worm gear (42), the second motor (44) is fixedly installed on the right side of the moving block (31), the second bevel gear (45) is fixedly installed on the output end of the second motor (44), and the second bevel gear (45) meshes with the first bevel gear (43). The bottom end of the first jaw clamp (46) is provided with a notch (461), and the locking plug (5) is disposed in the notch (461) between the bottom end of the second jaw clamp (47) and the bottom end of the first jaw clamp (46).

5. A construction hoisting tool according to claim 4, characterized in that, The locking plug (5) includes a fixing rod (51), a limiting head (52), a collar (53), and a limiting block (55). The fixing rod (51) is installed at the bottom end of the second claw clamp (47). The limiting head (52) is installed at the end of the fixing rod (51) away from the second claw clamp (47), and the edge of the limiting head (52) near the first claw clamp (46) is set in an arc shape. The collar (53) is movably sleeved on the fixing rod (51). The side wall of the collar (53) away from the limiting head (52) is set as a slope. A first spring sleeved on the fixing rod (51) is fixedly connected between the collar (53) and the bottom end of the second claw clamp (47). Spring (54), grooves are provided on both sides of the inner wall of the notch (461), two limiting blocks (55) are provided and are respectively inserted into the two grooves, and a second spring (56) is fixedly connected between the two limiting blocks (55) and the inner end of the corresponding groove. The end of the two limiting blocks (55) away from the second spring (56) extends out of the groove. The side of the two limiting blocks (55) located in the notch (461) and close to the second claw clamp (47) is set as an inclined surface. The limiting head (52) at the end of the fixing rod (51) can extend into the notch (461), and the limiting block (55) can abut against the side of the limiting head (52) close to the collar (53).

6. A construction hoisting tool according to claim 1, characterized in that, The transmission mechanism (2) includes a screw (21), a first gear (23), a first motor (24), and a second gear (25). The two slots (12) are provided with shaft grooves at their opposite ends. Bearings (22) are installed in the two shaft grooves. A connecting insertion hole is provided between the two slots (12). The screw (21) is inserted through the insertion hole, and the two ends of the screw (21) are respectively inserted into the two bearings (22). The part of the screw (21) located in the two slots (12) is provided with a positive thread and a negative thread, respectively. A gear groove is provided at the center of the crossbeam (1). The first gear (23) is located in the gear groove and rotates and is sleeved at the center of the screw (21). The top of the first gear (23) extends out of the gear groove. The first motor (24) is installed on the top of the crossbeam (1). The second gear (25) is installed at the output end of the first motor (24), and the bottom of the second gear (25) meshes with the top of the first gear (23).

7. A construction hoisting tool according to claim 2, characterized in that, Both of the moving blocks (31) have screw holes (33) at the center of their sides, and the screw holes (33) on the sides of the two moving blocks (31) are respectively threaded onto the positive thread and the negative thread at both ends of the screw rod (21).

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