Steel structure building construction hoisting clamp

Abstract

This invention belongs to the field of hoisting clamp technology, specifically a hoisting clamp for steel structure construction, including a hoisting platform, a lifting device mounting base, a clamping arm assembly, and an abutment part. The lifting device mounting base is fixedly connected to the middle of the hoisting platform. The top of the clamping arm assembly is slidably connected to the lifting device mounting base for clamping I-beams. The abutment part is slidably connected to the bottom of the lifting device mounting base. By setting the abutment part and the clamping arm assembly, when a vertically downward pressure is applied to the hoisting platform, the abutment part contacts the workpiece surface and slides within the lifting device mounting base, adaptively driving the bottom of the clamping arm unit to expand and engage with the I-beam flange. When the downward pressure is removed and the lifting action begins, the bottom of the clamping arm unit automatically retracts and locks. The downward pressure and upward pull applied to the hoisting platform are directly converted into the opening and clamping action of the clamping arm unit, reducing additional power sources, control steps, or complex operations, achieving rapid operation, simplifying the operation process, and improving hoisting efficiency.

Description

Technical Field

[0001] This invention belongs to the field of hoisting clamp technology, specifically a hoisting clamp for steel structure building construction. Background Technology

[0002] In the field of steel structure construction, the hoisting and transportation of long steel structural components such as I-beams and H-beams is a high-frequency and critical operation. Therefore, safe, efficient and convenient hoisting tools are of great significance for ensuring construction safety and improving work efficiency.

[0003] Currently, common methods for hoisting steel structures often involve using wire rope binding or specialized lifting equipment. However, wire rope binding has drawbacks such as being cumbersome to tie, prone to slipping, and damaging the coating of steel components.

[0004] Existing specialized lifting devices, such as the one disclosed in CN119954030A, which describes a precise positioning and lifting device and method for building steel structures, have improved their specificity. However, the clamping mechanism usually requires complex power drives (such as hydraulic or electric) and specialized control steps to open and close the grippers. During operation, it is often necessary to manually or through equipment first control the clamp to perform the opening operation, align it with the flange of the I-beam, and then perform the clamping operation. After the lifting is completed, the loosening operation must be performed again.

[0005] Therefore, in existing technologies, using specialized lifting equipment to lift steel structures results in numerous steps and inconvenient operation, especially in situations requiring frequent lifting, which significantly impacts overall construction efficiency. Furthermore, complex drive mechanisms also imply higher manufacturing costs, maintenance needs, and potential failure risks.

[0006] Therefore, the present invention provides a steel structure building construction hoisting clamp. Summary of the Invention

[0007] In order to overcome the shortcomings of the prior art, at least one technical problem raised in the background art is solved.

[0008] The technical solution adopted by this invention to solve its technical problem is: a steel structure building construction hoisting clamp as described in this invention, comprising:

[0009] Hanging platform;

[0010] The lifting device mounting base is fixedly connected to the middle of the lifting platform;

[0011] The clamping arm assembly, with its top slidably connected within the lifting device mounting base, is used to clamp the I-beam.

[0012] The contact part is slidably connected to the bottom of the lifting device mounting base;

[0013] When a vertically downward pressure is applied to the lifting platform, the contact part contacts the upper surface of the I-beam and obtains an upward reaction force, sliding upward relative to the lifting device mounting seat, driving the bottom of the clamping arm assembly to expand outward to pass over the upper flange of the I-beam;

[0014] When the downward pressure is released and the lifting platform is lifted upward, the abutment slides downward relative to the lifting device mounting seat, driving the bottom of the clamping arm assembly to retract inward to clamp the lower surface of the upper flange of the I-beam.

[0015] Preferably, it also includes two auxiliary arm units; the two auxiliary arm units are symmetrically hinged to the top of the spreader mounting base, and the tops of the two auxiliary arm units are based on tooth engagement.

[0016] Preferably, the lifting device mounting base includes an auxiliary arm mounting part and a clamping arm mounting part fixedly connected from top to bottom;

[0017] The auxiliary arm unit is hinged to the auxiliary arm mounting part; the top of the clamping arm assembly is slidably connected to the clamping arm mounting part, and the clamping arm mounting part is provided with a clamping arm movable groove and a bottom through groove, and the clamping arm movable groove and the bottom through groove are connected.

[0018] Preferably, the clamping arm assembly includes two symmetrical clamping arm units, a connecting shaft, and a traction arm;

[0019] The tops of the two clamping arm units are coaxially hinged to a connecting shaft, which is slidably connected within the movable groove of the clamping arm.

[0020] One end of the traction arm is hinged to the side wall of the clamp arm mounting part, and the other end is hinged to the side wall of the clamp arm unit.

[0021] Preferably, the contact part includes an abutment rod, a connecting rod, a support plate, and a second spring;

[0022] The abutment rod is slidably connected in the bottom through groove; the connecting rod is fixedly connected to the top of the abutment rod; the support plate is fixedly connected to the top of the connecting rod and slidably connected in the movable groove of the clamping arm;

[0023] The second spring is sleeved on the connecting rod, and the two ends of the second spring abut against the connecting rod and the top surface of the bottom through groove, respectively.

[0024] Preferably, a buffer spring mechanism is provided between the two auxiliary arm units;

[0025] The buffer spring mechanism includes an arc-shaped rod that passes through the two auxiliary arm units, and a first spring sleeved on the arc-shaped rod;

[0026] The two ends of the first spring abut against the ball head at the end of the arc-shaped rod and the auxiliary arm unit, respectively.

[0027] Preferably, the clamping arm mounting part has a clearance groove parallel to the clamping arm movable groove, and the middle part of the arc-shaped rod passes through the clearance groove.

[0028] Preferably, a first hinge rod is fixed to the bottom outer side of the lifting device mounting base, and a second hinge rod is fixed to the side wall of the clamping arm unit;

[0029] One end of the traction arm is hinged to the first hinge rod, and the other end is hinged to the second hinge rod.

[0030] Preferably, a fixing plate is fixedly connected to the middle of the hanging platform, and the top of the auxiliary arm mounting part penetrates through the hanging platform and is fixedly connected to the fixing plate.

[0031] Preferably, a lifting ring is fixedly connected to the lifting platform, and the number of the lifting rings is at least four, symmetrically distributed at the corners of the lifting platform.

[0032] The beneficial effects of this invention are as follows:

[0033] 1. The steel structure building construction hoisting clamp of the present invention, by setting an abutment part and a clamping arm assembly that can slide along the bottom of the lifting device mounting base, when a vertical downward pressure is applied to the lifting platform, the abutment part contacts the upper surface of the I-beam and slides within the lifting device mounting base, adaptively driving the bottom of the clamping arm unit to expand and engage with the flange of the I-beam. When the downward pressure is removed and the lifting action is initiated, the bottom of the clamping arm unit automatically retracts and locks. The downward pressure and upward pull applied to the lifting platform are directly converted into the opening and clamping action of the clamping arm unit, reducing additional power sources, control steps or complex operations, achieving rapid operation, simplifying the operation process, and improving hoisting efficiency.

[0034] 2. The steel structure construction hoisting clamp of the present invention, through the coupling design of the self-weight of the I-beam and the retracting motion of the clamping arm, and the rapid reset mechanism of the contact part provided by the second spring, generates a reliable locking synergy effect in which the clamping force increases with the increase of load. During the lifting process, the inward torque generated by the self-weight of the I-beam acting on the clamping arm and the active tightening effect of the second spring driving the contact part to move downward work together to make the clamping force adaptively increase with the increase of the lifting weight, forming a stable self-locking. At the same time, the auxiliary arm provides buffering and stable support when in contact, ensuring that the clamping is always reliable and requires no manual intervention throughout the entire hoisting process, especially under dynamic working conditions of lifting and moving, reducing the risk of workpiece slippage due to operational errors or unstable clamping, and improving operational safety. Attached Figure Description

[0035] The invention will now be further described with reference to the accompanying drawings.

[0036] Figure 1 This is a perspective view of the present invention;

[0037] Figure 2 This is a first perspective view of the lifting device mounting base and clamping arm assembly in this invention;

[0038] Figure 3 This is a second perspective view of the lifting device mounting base and clamping arm assembly in this invention;

[0039] Figure 4 This is a partial sectional view of the lifting device mounting base and clamping arm assembly in this invention;

[0040] Figure 5 yes Figure 4 An explosion diagram;

[0041] Figure 6 This is a dynamic schematic diagram of the contact between the lifting clamp and the I-beam in this invention;

[0042] Figure 7 This is a dynamic schematic diagram of the contact between the lifting device mounting base, the clamping arm assembly, and the I-beam in this invention;

[0043] In the diagram: 1. Lifting platform; 11. Lifting ring; 12. Fixing plate; 2. Auxiliary arm unit; 21. Arc rod; 22. First spring; 3. Lifting device mounting base; 31. Auxiliary arm mounting part; 32. Clamping arm mounting part; 321. Clearance slot; 322. Clamping arm movable slot; 323. Bottom slot; 324. First hinge rod; 33. Contact part; 331. Abutment rod; 332. Connecting rod; 333. Support plate; 334. Second spring; 4. Clamping arm assembly; 41. Clamping arm unit; 411. Second hinge rod; 42. Traction arm; 43. Connecting shaft; 5. I-beam. Detailed Implementation

[0044] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0045] like Figures 1 to 7 As shown in the figure, a steel structure building construction hoisting clamp according to an embodiment of the present invention includes a hoisting platform 1, a hoisting tool mounting base 3, a clamping arm assembly 4, and an abutment part 33; the hoisting tool mounting base 3 is fixedly connected to the middle part of the hoisting platform 1; the top of the clamping arm assembly 4 is slidably connected to the hoisting tool mounting base 3 for clamping the I-beam 5; the abutment part 33 is slidably connected to the bottom of the hoisting tool mounting base 3;

[0046] When a vertical downward pressure is applied to the lifting platform 1, the contact part 33 contacts the upper surface of the I-beam 5 and obtains an upward reaction force, sliding upward relative to the lifting device mounting seat 3, driving the bottom of the clamping arm assembly 4 to expand outward to pass over the upper flange of the I-beam 5.

[0047] When the downward pressure is released and the lifting platform 1 is lifted upward, the contact part 33 slides downward relative to the lifting device mounting seat 3, driving the bottom of the clamping arm assembly 4 to retract inward to clamp the lower surface of the upper flange of the I-beam 5.

[0048] In existing technologies, steel structures are lifted using specialized lifting equipment, resulting in numerous steps and inconvenient operation. This is particularly problematic in situations requiring frequent lifting, significantly impacting overall construction efficiency. Furthermore, the complex drive mechanism also implies higher manufacturing costs, maintenance needs, and potential failure risks.

[0049] In one embodiment of the present invention, during the construction process, particularly in the scenario involving the hoisting of steel structures, a vertically downward pressure can be applied to the lifting platform 1 to cause the contact part 33 to contact the upper surface of the I-beam 5, thereby sliding upward within the lifting device mounting seat 3. Based on the contact part 33 pressing the top of the clamping arm assembly 4, it slides and connects to the lifting device mounting seat 3, causing the bottom of the clamping arm assembly 4 to expand outward until the bottom of the clamping arm assembly 4 passes the upper flange of the I-beam 5. At this time, the distance between the lifting device mounting seat 3 and the I-beam 5 is shortened. Then, the vertically downward pressure is removed, and the lifting platform 1 is lifted by the crane. At this time, the contact part 33 slides relative to the lifting device mounting seat 3, increasing the distance between the lifting device mounting seat 3 and the I-beam 5. At this time, the bottom of the clamping arm assembly 4 contracts inward to clamp the lower surface of the upper flange of the I-beam 5. Under the action of the weight of the I-beam 5, a downward pressure is applied to the clamping arm assembly 4, so that the clamping arm assembly 4 maintains a stable clamping force on the I-beam 5 during the hoisting process.

[0050] Specifically, such as Figure 7 As shown:

[0051] like Figure 7 As shown in -a, at this time, the clamping arm assembly 4 is not in contact with the I-beam 5. Under the driving action of the contact part 33, the clamping arm assembly 4 remains in an inward retracted state. Therefore, in this state, the clamping arm assembly 4 cannot directly cross the upper flange of the I-beam 5, and thus cannot directly grab the I-beam 5; where the dashed arrow represents the vertical downward pressure.

[0052] like Figure 7 As shown in -b, under continuous vertical downward pressure, the clamping arm assembly 4 contacts the upper surface of the I-beam 5. The reaction force from the contact part 33's contact with the upper surface of the I-beam 5 causes the contact part 33 to slide upwards within the lifting device mounting base 3. Based on the sliding of the contact part 33, the top of the clamping arm assembly 4 slides upwards within the lifting device mounting base 3, causing the bottom of the clamping arm assembly 4 to expand outwards, passing over the upper flange side of the I-beam 5. In this state, due to the continuous downward pressure on the lifting platform 1, the distance between the lifting device mounting base 3 and the I-beam 5 shortens. The solid arrow indicates the rotation direction of the clamping arm assembly.

[0053] like Figure 7 As shown in -c, under continuous vertical downward pressure, the expanded clamping arm assembly 4 will cross the upper flange of the I-beam 5, so that the bottom of the clamping arm assembly 4 can be stably clamped at the bottom of the upper flange of the I-beam 5 after contraction. At this time, the vertical downward pressure is removed, and the lifting platform 1 is lifted based on the crane control. At this time, the lifting device mounting seat 3 is subjected to an upward pulling force, the distance between the lifting device mounting seat 3 and the I-beam 5 increases, the reaction force on the contact part 33 decreases, and the contact part 33 can generate relative sliding in the lifting device mounting seat 3 and slide in the reset direction, so that the bottom of the clamping arm assembly 4 contracts inward, thereby maintaining a stable clamping of the I-beam 5. The solid arrow indicates the rotation direction of the clamping arm assembly.

[0054] Based on the above, the continuous downward pressure applied to the lifting platform 1, and the contact and compression between the contact part 33 and the upper surface of the I-beam 5, enable the clamping arm assembly 4 to adaptively expand upon contact with the I-beam 5. This allows the clamping arm assembly 4 to cross the upper flange of the I-beam 5 and prepare for clamping. Subsequently, the continuous downward pressure is released, and the lifting device mounting base 3 is simultaneously lifted, increasing the distance between the lifting device mounting base 3 and the I-beam 5. At this point, the contact part 33 causes the clamping arm assembly 4 to retract inward to maintain a stable clamping effect on the I-beam 5. Correspondingly, after the I-beam 5 is hoisted to the designated position, only a stable downward pressure needs to be reapplied to ensure that the clamping arm assembly 4 expands beyond the upper flange of the I-beam 5 and disengages from the I-beam 5 under mechanical or manual force.

[0055] like Figure 1 , Figure 6 As shown, it also includes two auxiliary arm units 2; the two auxiliary arm units 2 are symmetrically hinged to the top of the lifting device mounting base 3, and the tops of the two auxiliary arm units 2 are based on tooth meshing.

[0056] In one embodiment of the present invention, when clamping and hoisting the I-beam 5, as described above, the adaptive expansion of the clamping arm assembly 4 enables it to pass over the upper flange surface of the I-beam 5. Based on force control, the clamping arm assembly 4 can retract inward after passing over the upper flange surface of the I-beam 5, thereby stabilizing the clamping of the I-beam 5. During this process, when the lifting platform 1 is subjected to vertical downward pressure, the two auxiliary arm units 2 can contact the surface of the I-beam 5, and under the action of pressure, the bottom of the auxiliary arm units 2 slides on the upper surface of the I-beam 5 to achieve multi-point contact with the surface of the I-beam 5. Combined with the clamping effect of the clamping arm assembly 4 on the I-beam 5, it can be ensured that the I-beam 5 remains relatively stable during hoisting, and the center of gravity of the I-beam 5 will not be unstable during hoisting due to too few or too small contact points between the hoisting clamp and the I-beam 5.

[0057] It is foreseeable that, compared to directly using the clamping arm assembly 4 to clamp the I-beam 5, during the hoisting process, because the contact point is only located at the contact position between the clamping arm assembly 4 and the I-beam 5, the contact area may be too small or the size of the I-beam 5 may be too large, causing the I-beam 5 to sway and deflect during the hoisting process. During high-altitude hoisting, any swaying and deflection will create hidden dangers such as increasing the load on the crane and threatening the safety of surrounding workers. Therefore, in this embodiment, by using the auxiliary arm unit 2 integrated on the lifting device mounting base 3, during the hoisting of the I-beam 5, the contact point between the lifting clamp and the I-beam 5 can be increased based on the extended auxiliary arm unit 2, thereby expanding the contact area between the lifting clamp and the I-beam 5, making the hoisting of the I-beam 5 more stable and reducing unnecessary swaying and deflection.

[0058] like Figures 1 to 5 , Figure 7 As shown, the lifting device mounting base 3 includes an auxiliary arm mounting part 31 and a clamping arm mounting part 32 that are fixedly connected from top to bottom;

[0059] The auxiliary arm unit 2 is hinged to the auxiliary arm mounting part 31; the top of the clamping arm assembly 4 is slidably connected to the clamping arm mounting part 32, and the clamping arm mounting part 32 is provided with a clamping arm movable groove 322 and a bottom through groove 323, and the clamping arm movable groove 322 and the bottom through groove 323 are connected.

[0060] The clamping arm assembly 4 includes two symmetrical clamping arm units 41, a connecting shaft 43, and a traction arm 42.

[0061] The tops of the two clamping arm units 41 are coaxially hinged to a connecting shaft 43, which is slidably connected within the clamping arm movable groove 322;

[0062] One end of the traction arm 42 is hinged to the side wall of the clamp arm mounting part 32, and the other end is hinged to the side wall of the clamp arm unit 41.

[0063] In one embodiment of the present invention, the clamping arm assembly 4, under continuous vertical downward pressure, contacts the upper surface of the I-beam 5 to be lifted, and subsequently expands outward. Then, the pressure is released, and the lifting device mounting base 3 is simultaneously lifted, causing the clamping arm assembly 4 to retract inward, thereby stably clamping the I-beam 5. Specifically, as shown... Figure 7 As shown:

[0064] like Figure 7 As shown in -a, when the two clamping arm units 41 are about to contact the upper surface of the I-beam 5, the distance between the lifting device mounting base 3 and the contact part 33 and the I-beam 5 is relatively large, and at this time the two clamping arm units 41 maintain the initial retracted state.

[0065] like Figure 7As shown in -b, under continuous vertical downward pressure, the contact part 33 contacts the surface of the I-beam 5, causing the contact part 33 to slide inward in the clamping arm mounting part 32, and the contact part 33 presses the connecting shaft 43, causing the connecting shaft 43 to slide upward in the clamping arm movable groove 322 in the clamping arm mounting part 32. At the same time, due to the presence of the traction arm 42, the two clamping arm units 41 expand outward, so that the bottom of the two clamping arm units 41 can expand beyond the upper flange sidewall of the I-beam 5. At this time, under continuous downward pressure, the bottom of the two clamping arm units 41 moves to the lower side of the upper flange of the I-beam 5. Thus, the clamping arm assembly 4 and the I-beam 5 complete the clamping preparation action.

[0066] like Figure 7 As shown in -c, after the clamping arm assembly 4 and the I-beam 5 have completed the clamping preparation action, the vertical downward pressure can be released. At the same time, the crane lifts the lifting platform 1 upward, and the lifting device mounting seat 3 is lifted based on the lifting platform 1. This causes the contact part 33 to move downward relative to the clamping arm movable groove 322. When the contact part 33 moves downward relative to the clamping arm movable groove 322, it can be understood that the contact part 33 slides downward in the clamping arm movable groove 322. Therefore, the connecting shaft 43 at the top of the clamping arm assembly 4 will also slide downward in the clamping arm movable groove 322 under the influence of gravity. Due to the restriction of the traction arm 42, the two clamping arm units 41 retract inward until the bottom of the two clamping arm units 41 are engaged with the upper flange of the I-beam 5, thus achieving the clamping of the I-beam 5.

[0067] When the arm is lifted, the weight of the I-beam 5 acts on the hook at the bottom of the clamping arm unit 41 through its lower flange, generating a torque that causes the clamping arm unit 41 to tend to retract inward. At this time, in conjunction with the upward movement of the lifting device mounting seat 3 and the release of the second spring 334, the contact part 33 is pushed to move downward relative to the lifting device mounting seat 3, and under the action of gravity, the connecting shaft 43 slides downward in the clamping arm movable groove 322. With the linkage of the traction arm 42, reliable locking is achieved.

[0068] like Figures 1 to 5 As shown, the contact part 33 includes an abutment rod 331, a connecting rod 332, a support plate 333, and a second spring 334;

[0069] The abutting rod 331 is slidably connected in the bottom through groove 323; the connecting rod 332 is fixedly connected to the top of the abutting rod 331; the support plate 333 is fixedly connected to the top of the connecting rod 332 and slidably connected in the clamping arm movable groove 322.

[0070] The second spring 334 is sleeved on the connecting rod 332, and the two ends of the second spring 334 abut against the abutting rod 331 and the top surface of the bottom through groove 323 respectively.

[0071] In one embodiment of the present invention, when a vertically downward pressure is applied to the hanger platform 1, the clamping arm assembly 4 and the lifting device mounting base 3 will move vertically downward, the contact part 33 will preferentially contact the upper surface of the I-beam 5, and when the contact part 33 slides in the clamping arm movable groove 322, it drives the two clamping arm units 41 to expand outward, and after the downward pressure is removed, based on the pulling force of lifting the hanger platform 1, the two clamping arm units 41 will retract inward, thereby clamping the upper flange of the I-beam 5;

[0072] Specifically, after the contact part 33 contacts the upper surface of the I-beam 5, it will be subjected to the reaction force of the upper surface of the I-beam 5, causing the contact part 33 to slide upward in the clamping arm movable groove 322 and compress the second spring 334, causing the second spring 334 to generate a downward restoring force. When the abutment rod 331 slides upward, it can drive the connecting rod 332 and the support plate 333 to slide upward in the clamping arm movable groove 322. Based on the support plate 333, the connecting shaft 43 moves upward, causing the tops of the two clamping arm units 41 to slide synchronously in the clamping arm movable groove 322. Simultaneously, based on the pressure of the abutment rod 331 and the top surface of the bottom through groove 323 on the second spring 334, elastic potential energy is stored, causing the second... Spring 334 generates a downward restoring force. When the vertical downward pressure is removed and an upward pulling force is generated, the restoring force of the second spring 334 ensures that the abutment rod 331 remains firmly against the upper surface of the I-beam 5. The lifting device mounting base 3 will move upward relative to the I-beam 5, causing the connecting rod 332 and the support plate 333 to slide relative to each other in the clamping arm movable groove 322. Therefore, the connecting shaft 43 will also slide relative to each other in the clamping arm movable groove 322. Thus, under the action of gravity, the two clamping arm units 41 will retract inward under the adjustment of the position of the connecting shaft 43 and the limiting action of the traction arm 42, so as to achieve the purpose of clamping the upper flange of the I-beam 5.

[0073] like Figure 1 , Figure 6 As shown, a buffer spring mechanism is provided between the two auxiliary arm units 2;

[0074] The buffer spring mechanism includes an arc-shaped rod 21 that passes through the two auxiliary arm units 2, and a first spring 22 sleeved on the arc-shaped rod 21;

[0075] The two ends of the first spring 22 abut against the ball head at the end of the arc-shaped rod 21 and the auxiliary arm unit 2, respectively.

[0076] As described above, in one embodiment of the present invention, when the suspension platform 1 is subjected to a vertical downward pressure, the two auxiliary arm units 2 will contact the upper surface of the I-beam 5 and, under the reaction force, will produce an outward expanding action, such as... Figure 6 As shown:

[0077] Among them, such as Figure 6 As shown in -A, the lifting clamp is not yet in contact with the I-beam 5. Under the action of the first spring 22, the two auxiliary arm units 2 will retract inward; the dashed arrow indicates the direction of downward pressure.

[0078] like Figure 6 As shown in -B, when the lifting clamp contacts the I-beam 5, since the clamp arm unit 41 has been inserted below the upper flange of the I-beam 5, the auxiliary arm unit 2 will contact the upper surface of the I-beam 5 and, under the reaction force, expand outward and compress the first spring 22; where the solid arrow indicates the rotation direction of the auxiliary arm unit.

[0079] To prevent scratching the upper surface of the I-beam 5 and to ensure smooth sliding between the auxiliary arm unit 2 and the upper surface of the I-beam 5, rollers can be installed at the bottom of the auxiliary arm unit 2, with the rollers contacting the upper surface of the I-beam 5. In addition, when the clamping arm unit 41 has finished clamping under the upper flange of the I-beam 5, the vertical downward pressure is released, and an upward pulling force is generated based on the crane. At this time, the auxiliary arm unit 2 will respond synchronously, and under the action of the first spring 22, the auxiliary lifting device mounting seat 3 moves upward away from the I-beam 5, thereby assisting the clamping arm unit 41 to quickly retract inward to clamp under the upper flange of the I-beam 5, achieving stable clamping of the I-beam 5.

[0080] like Figures 1 to 5 As shown, the clamping arm mounting part 32 is provided with a clearance through groove 321 parallel to the clamping arm movable groove 322, and the middle part of the arc-shaped rod 21 passes through the clearance through groove 321.

[0081] As described above, the arc-shaped rod 21 is configured to connect the two auxiliary arm units 2 and to limit the displacement path of the two auxiliary arm units 2, and to serve as a carrier for the first spring 22, wherein it can pass through and be fixed in the clearance slot 321 within the clamping arm mounting portion 32.

[0082] like Figures 1 to 5 As shown, a first hinge rod 324 is fixed to the outer bottom of the lifting device mounting base 3, and a second hinge rod 411 is fixed to the side wall of the clamping arm unit 41.

[0083] One end of the traction arm 42 is hinged to the first hinge rod 324, and the other end is hinged to the second hinge rod 411.

[0084] like Figure 1 As shown, a fixing plate 12 is fixedly connected to the middle of the hanging platform 1, and the top of the auxiliary arm mounting part 31 passes through the hanging platform 1 and is fixedly connected to the fixing plate 12.

[0085] like Figure 1 As shown, at least four lifting rings 11 are fixedly connected to the hanging platform 1, and they are symmetrically distributed at the corners of the hanging platform 1.

[0086] Working principle: The lifting clamp in this invention is based on the cooperation between the clamp arm assembly 4 and the contact part 33 to achieve an adaptive clamping function of self-opening under pressure and self-locking when lifted. The whole process does not require external power and is driven only by vertical pressure and lifting force.

[0087] In the initial state (corresponding to) Figure 7 -a): The lifting clamp is suspended and does not contact the I-beam 5. Under the preload of the second spring 334, the contact part 33 is in a relatively lower position. The support plate 333 supports the connecting shaft 43 at the top of the clamp arm assembly 4, so that the connecting shaft 43 is located in the lower middle part of the clamp arm movable groove 322. At this time, the two clamp arm units 41 are in a contracted state with their bottoms close together under the constraint of the traction arm 42, and cannot be directly inserted into the upper flange of the I-beam 5.

[0088] Downward expansion and jamming phase (corresponding to) Figure 7 -b): Applying a vertical downward pressure to the lifting platform 1 causes the entire lifting clamp to move downward, the contact part 33 to slide upward, and the second spring 334 to store energy. Specifically, the abutment rod 331 at the lower end of the contact part 33 first contacts the upper surface of the I-beam 5. Under the continuous downward pressure, the abutment rod 331 is blocked, while the lifting device mounting seat 3 continues to move downward, causing the abutment rod 331 to slide upward relative to the lifting device mounting seat 3, compressing the second spring 334. The abutment rod 331 drives the support plate 333 to move upward together in the clamp arm movable groove 322 through the connecting rod 332.

[0089] Subsequently, the clamping arm unit 41 passively expands. Based on the upward movement of the support plate 333, the push connecting shaft 43 slides upward along the clamping arm movable groove 322. Due to the upward movement of the connecting shaft 43 and the linkage action of the two symmetrical traction arms 42 (one end is hinged to the clamping arm mounting part 32, and the other end is hinged to the side wall of the clamping arm unit 41), the two clamping arm units 41 are forced to rotate and expand outward around their top hinge point, causing the bottom hooks of the clamping arm units 41 to open. As the downward pressure continues, the bottom hooks of the expanded clamping arm units 41 cross the edge of the upper flange of the I-beam 5. At this time, the auxiliary arm unit 2 also contacts the upper surface of the I-beam 5 and expands slightly under pressure to provide cushioning and stable contact.

[0090] Enhance the locking stage (corresponding to) Figure 7 -c): After the bottom of the clamp arm unit 41 has passed the flange of the I-beam 5, the downward pressure is removed and the lifting platform 1 is slowly and steadily lifted upward. At the moment the downward pressure is removed, the compressed second spring 334 begins to release its stored elastic potential energy, which, together with the lifting device mounting seat 3, causes the abutment rod 331, connecting rod 332 and support plate 333 to slide downward and reset relative to the lifting device mounting seat 3.

[0091] As the pallet 333 moves downward, the connecting shaft 43 moves downward along the clamping arm movable groove 322 under the gravity of the clamping arm unit 41. At the same time, the weight of the I-beam 5 acts on the clamping arm hook through its lower flange. Combined with the weight of the clamping arm unit 41, a torque is generated that causes the clamping arm unit 41 to retract inward. Based on the downward movement of the connecting shaft 43, under the linkage of the traction arm 42, the bottom hooks of the two clamping arm units 41 are powerfully driven to rotate and retract inward, tightly clamping onto the lower surface of the upper flange of the I-beam 5.

[0092] Subsequently, stable hoisting is performed. As the lifting force continues, the I-beam 5 is lifted off the ground, and its entire weight is converted into a downward force on the bottom hook of the clamping arm unit 41. This force is transmitted to the contact part 33 through the clamping arm unit 41, the connecting shaft 43, and the support plate 333, and is partially balanced by the second spring 334, forming a stable self-locking mechanism. The clamping force increases with the increase of the lifting weight to ensure transportation safety. The auxiliary arm unit 2 is restored under the action of the first spring 22, providing auxiliary support and preventing the workpiece from rotating or swaying.

[0093] After the workpiece is unloaded upon arrival at the position, and the I-beam 5 is placed in the target position, the above-mentioned downward expansion process can be repeated simply by applying sufficient vertical downward pressure again, so that the bottom of the clamping arm unit 41 opens, thereby easily detaching from the I-beam 5.

[0094] 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 steel structure building construction hoisting clamp, characterized in that: include: Hanging platform (1); The lifting device mounting base (3) is fixedly connected to the middle part of the lifting platform (1); The clamping arm assembly (4) is slidably connected at the top to the lifting device mounting base (3) for clamping the I-beam (5); The contact part (33) is slidably connected to the bottom of the lifting device mounting base (3); When a vertical downward pressure is applied to the lifting platform (1), the contact part (33) contacts the upper surface of the I-beam (5) and obtains an upward reaction force, sliding upward relative to the lifting device mounting seat (3), driving the bottom of the clamping arm assembly (4) to expand outward to pass over the upper flange of the I-beam (5); When the downward pressure is released and the lifting platform (1) is lifted upward, the contact part (33) slides downward relative to the lifting device mounting seat (3), driving the bottom of the clamping arm assembly (4) to retract inward to clamp the lower surface of the upper flange of the I-beam (5).

2. The steel structure building construction hoisting clamp according to claim 1, characterized in that: It also includes two auxiliary arm units (2); the two auxiliary arm units (2) are symmetrically hinged to the top of the spreader mounting base (3), and the tops of the two auxiliary arm units (2) are based on tooth engagement.

3. A steel structure building construction hoisting clamp according to claim 2, characterized in that: The lifting device mounting base (3) includes an auxiliary arm mounting part (31) and a clamping arm mounting part (32) that are fixedly connected from top to bottom. The auxiliary arm unit (2) is hinged to the auxiliary arm mounting part (31); the top of the clamping arm assembly (4) is slidably connected to the clamping arm mounting part (32), and the clamping arm mounting part (32) is provided with a clamping arm movable groove (322) and a bottom through groove (323), and the clamping arm movable groove (322) and the bottom through groove (323) are connected.

4. A steel structure building construction hoisting clamp according to claim 3, characterized in that: The clamping arm assembly (4) includes two symmetrical clamping arm units (41), a connecting shaft (43), and a traction arm (42). The tops of the two clamping arm units (41) are coaxially hinged to a connecting shaft (43), which is slidably connected in the clamping arm movable groove (322); One end of the traction arm (42) is hinged to the side wall of the clamp arm mounting part (32), and the other end is hinged to the side wall of the clamp arm unit (41).

5. A steel structure building construction hoisting clamp according to claim 3, characterized in that: The contact part (33) includes an abutment rod (331), a connecting rod (332), a support plate (333), and a second spring (334). The abutment rod (331) is slidably connected in the bottom through groove (323); the connecting rod (332) is fixedly connected to the top of the abutment rod (331); the support plate (333) is fixedly connected to the top of the connecting rod (332) and slidably connected in the clamping arm movable groove (322); The second spring (334) is sleeved on the connecting rod (332), and the two ends of the second spring (334) abut against the top surface of the abutting rod (331) and the bottom through groove (323), respectively.

6. A steel structure building construction hoisting clamp according to claim 3, characterized in that: A buffer spring mechanism is provided between the two auxiliary arm units (2); The buffer spring mechanism includes an arc-shaped rod (21) that passes through the two auxiliary arm units (2), and a first spring (22) sleeved on the arc-shaped rod (21). The two ends of the first spring (22) abut against the ball head at the end of the arc-shaped rod (21) and the auxiliary arm unit (2), respectively.

7. A steel structure building construction hoisting clamp according to claim 6, characterized in that: The clamping arm mounting part (32) is provided with a clearance through groove (321) parallel to the clamping arm movable groove (322), and the middle part of the arc rod (21) passes through the clearance through groove (321).

8. A steel structure building construction hoisting clamp according to claim 4, characterized in that: The bottom outer side of the lifting device mounting base (3) is fixed with a first hinge rod (324), and the side wall of the clamping arm unit (41) is fixed with a second hinge rod (411). One end of the traction arm (42) is hinged to the first hinge rod (324), and the other end is hinged to the second hinge rod (411).

9. A steel structure building construction hoisting clamp according to claim 3, characterized in that: A fixing plate (12) is fixedly connected to the middle of the hanging platform (1), and the top of the auxiliary arm mounting part (31) passes through the hanging platform (1) and is fixedly connected to the fixing plate (12).

10. A steel structure building construction hoisting clamp according to claim 1, characterized in that: The hanging platform (1) is fixed with lifting rings (11), and the number of lifting rings (11) is at least four, which are symmetrically distributed at the corners of the hanging platform (1).

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