A hoisting clamp suitable for multi-size H-shaped steel

Abstract

A lifting clamp adaptable to H-beams of various sizes includes a flat plate and clamping blocks. The flat plate is provided with a rolling groove, in which a rolling shaft is inserted, and the rolling shaft is connected to the top of the clamping block. The clamping block also includes a clamping block, one end of which is close to another clamping block. A flange is provided above the clamping block, and the flange moves vertically. In application, the clamp is first positioned at the lifting point of the H-beam, then the clamping blocks are moved to the sides to allow the H-beam to enter the clamp, then the clamping blocks move towards the H-beam, and the flange presses against the H-beam. After the H-beam is lifted and stabilized, the flange presses against the H-beam again. The rolling shaft slides within the rolling groove to adjust the spacing between the clamping blocks, thus clamping H-beams of different sizes. The gravity of the H-beam causes the rolling shaft to move downwards, and the rolling shaft causes the clamping blocks to move towards the H-beam, thus achieving a gravity self-locking function. Therefore, this design can adapt to H-beams of various sizes and has a gravity self-locking function.

Description

Technical Field

[0001] This invention relates to a lifting clamp, belonging to the field of profile lifting clamps, and particularly to a lifting clamp for H-beams. Background Technology

[0002] When transferring or lifting H-beams, lifting clamps are often used to assist in clamping the H-beams.

[0003] Chinese patent application number 201822027266.1, filed on December 4, 2018, discloses an H-beam lifting clamp, comprising an inner connector and an outer connector that are nested together. The inner connector has a first L-shaped clamp, and the outer connector has a second L-shaped clamp. The first and second L-shaped clamps are arranged opposite to each other and cooperate to clamp the H-beam. Radial positioning holes are formed on both the inner and outer connectors, and positioning components are provided in these holes. The inner connector also has a first lifting lug, and the outer connector has a second lifting lug. Although this design achieves axial positioning and disassembly of the inner and outer connectors by operating the positioning components, it still has the following drawbacks: The positioning hole position of this design is fixed, and it can only clamp H-beams that match the position of the positioning hole. It is not well adapted to H-beams of large or small size, so it cannot be well adapted to H-beams of various sizes.

[0004] The information disclosed in this background section is intended only to enhance understanding of the overall background of this application and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Summary of the Invention

[0005] The purpose of this invention is to overcome the defects and problems of existing technologies that cannot adapt well to H-beams of various sizes, and to provide a lifting clamp that can adapt to H-beams of different sizes.

[0006] To achieve the above objectives, the technical solution of the present invention is: A lifting clamp adaptable to H-beams of various sizes, the clamp comprising a flat plate and clamping blocks; The flat plate includes a middle section and wing plate sections located on both sides of the middle section. The structure of the wing plate sections is symmetrical along the center line of the middle section. A rolling groove is provided on the wing plate section, which passes through the front and rear sides of the wing plate section. The end of the rolling groove away from the middle section is higher than the end of the rolling groove near the middle section. A rolling shaft is inserted in the rolling groove. The rolling shaft is perpendicular to the plane where the rolling groove is located. The two ends of the rolling shaft are perpendicularly connected to the top of the clamping block. The structure of the clamping block is symmetrical along the center line of the middle part. The clamping block includes a sliding plate, a connecting block, and a clamping block. There are two sliding plates, one of which is located on the front side of the wing plate and the other is located on the rear side of the wing plate. The sliding plate is provided with a sliding hole, and one end of a rolling shaft is inserted into the sliding hole. The bottom of the sliding plate is connected to the top of the connecting block, the bottom of the connecting block is perpendicularly connected to one end of the clamping block, and the other end of the clamping block is close to the other clamping block. A flange is provided above the clamping block, and the flange is located below the middle part. The movement stroke of the flange is up and down.

[0007] The top of the flange is connected to the bottom of the lead screw, the diameter of which is smaller than the diameter of the flange. The top of the lead screw is connected to the bottom of the handle, the diameter of which is larger than the diameter of the lead screw.

[0008] The middle part of the lead screw is threadedly connected to the middle part of the lead screw connecting block; The lead screw connecting block includes a flat block portion and a semi-cylindrical block portion. The semi-cylindrical block portion is provided with a lead screw hole, which is a through hole penetrating the top and bottom ends of the semi-cylindrical block portion. The inner surface of the lead screw hole is evenly distributed with internal threads, and a lead screw is inserted into the lead screw hole. The outer surface of the lead screw is evenly distributed with external threads, and the lead screw hole is threadedly connected to the lead screw. The flat block portion is connected to the middle portion.

[0009] The top of the handle is also provided with a toggle bar, which is located on the edge of the middle of the handle, and the bottom of the toggle bar is vertically connected to the top of the handle.

[0010] The distance from the lead screw hole to the middle part is 25 to 35 mm.

[0011] The wing plate has two rolling grooves, and the distance between adjacent rolling grooves on the wing plate is the width of one to two rolling grooves.

[0012] The inclination angle between the rolling groove and the horizontal line is 10 to 20 degrees, and the inclination angle between the bottom of the wing plate and the horizontal line is 10 to 20 degrees.

[0013] The length of the rolling groove is 100 to 300 mm, and the width of the rolling groove is 20 to 100 mm; The length of the rolling shaft is 100-150 mm.

[0014] The top center of the wing plate is connected to the bottom of the lifting block. The middle of the lifting block is provided with a lifting hole, which is a through hole that passes through the front and rear sides of the lifting block.

[0015] The clamping block has a chamfered surface at one end near the flange, and the chamfered surface forms a top angle with the top surface of the clamping block, the degree of which is 130 degrees to 160 degrees; the chamfered surface forms a side angle with the side of the clamping block facing the flange, the degree of which is 130 degrees to 160 degrees.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. This invention provides a lifting clamp for H-beams of various sizes. The clamp includes a flat plate and clamping blocks. Rolling grooves are provided on both sides of the flat plate, and a rolling shaft is inserted into each groove. The rolling shaft is connected to a sliding hole at the top of the clamping block. The clamping block also includes a vertically connected connecting block and a clamping block. A flange is provided above the clamping block, located below the flat plate. The flange's movement is vertical. In application, the clamping block clamps the H-beam from both sides, and the flange presses the H-beam from the top. When lifting the H-beam, the weight of the H-beam causes the clamping block to move downwards, thereby driving the rolling shaft to move downwards within the rolling grooves. The rolling shaft then drives the clamping block to further clamp the H-beam from both sides, achieving a self-locking function using the weight of the H-beam. The rolling shaft rolls within the rolling grooves, simultaneously moving the two clamping blocks, increasing or decreasing the distance between them, thus adapting to different thicknesses of the H-beam. Therefore, the present invention can be adapted to H-beams of various sizes and has a gravity self-locking function.

[0017] 2. In this invention, a lifting clamp adaptable to H-beams of various sizes, a flange is connected to a lead screw, which is threadedly connected to a lead screw fixing block in the middle. The lead screw fixing block is fixed to the middle part. In application, rotating the lead screw within the lead screw fixing block achieves the effect of raising and lowering the lead screw, thereby driving the flange to rise and fall. When the flange descends to connect with the top of the H-beam, the flange presses down on the H-beam, achieving the effect of fixing the H-beam; when the flange rises to no longer connect with the H-beam, the fixing of the H-beam is released. Therefore, this invention has a good fixing effect.

[0018] 3. In the lifting clamp of the present invention, which is adapted to H-beams of various sizes, there are two rolling grooves on the wing plate. The inclination angle of the rolling grooves is 10 to 20 degrees. In application, the rolling grooves with a left-to-lower-right-to-upper tendency can better achieve the effect of automatic downward rolling of the rolling shaft. When the inclination angle of the rolling grooves is less than 10 degrees, the clamping effect of the clamping block on the H-beam is poor. When the inclination angle of the rolling grooves is greater than 20 degrees, the rolling grooves become higher, resulting in the overall size of the clamp becoming longer and taller. Therefore, the present invention has a good clamping effect.

[0019] 4. In the lifting clamp of the present invention, which is adapted to H-beams of various sizes, the top of the wing plate is connected to the lifting block, and the middle of the lifting block is provided with a lifting hole. In application, when it is necessary to lift the H-beam, the wire rope is passed through the lifting hole, and pulling the wire rope upward will move the lifting block upward, thereby moving the clamp upward and lifting the H-beam. Therefore, the present invention is convenient for lifting.

[0020] 5. In the lifting clamp for H-beams of various sizes, the clamping block has a chamfered surface at one end near the flange. During application, the chamfered surface creates a gap between the clamping block and the connection between the web and flange of the H-beam. Without the chamfered surface, the top of the clamping block would press against the connection between the web and flange, potentially causing deformation and damaging the H-beam. Because this clamp has a chamfered surface, it does not damage the H-beam during lifting. Therefore, this invention provides better protection for the H-beam. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of the present invention.

[0022] Figure 2 yes Figure 1 A schematic diagram of the structure of the medium-plate section.

[0023] Figure 3 yes Figure 1 The front view.

[0024] Figure 4 yes Figure 1 The left view.

[0025] Figure 5 yes Figure 1 Top view.

[0026] Figure 6 yes Figure 1 Application diagram.

[0027] Figure 7 This is a schematic diagram of the clamping block clamping H-beams.

[0028] Figure 8 yes Figure 6 The left view.

[0029] Figure 9 yes Figure 6 Top view.

[0030] Figure 10 yes Figure 1 A schematic diagram of the structure of the lead screw connecting block.

[0031] Figure 11 yes Figure 10 A-A cross-section.

[0032] Figure 12 yes Figure 1 A schematic diagram of the lead screw.

[0033] Figure 13 This is a structural schematic diagram of Example 6.

[0034] In the figure: Flat plate 1, middle part 11, wing plate 12, clamping block 2, sliding plate 21, sliding hole 211, connecting block 22, clamping block 23, rolling groove 3, rolling shaft 4, clamping part 41, flange 5, lead screw 51, handle 52, lead screw connecting block 53, block flat part 531, block semi-cylindrical part 532, lead screw hole 533, actuating bar 54, lifting block 6, lifting hole 61, chamfered surface 7, top included angle 71, side included angle 72, H-beam 8, H-beam web 81, H-beam wing plate 82. Detailed Implementation

[0035] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0036] Please see Figure 1 — Figure 13 A lifting clamp for H-beams of various sizes, the clamp comprising a flat plate 1 and a clamping block 2; The flat plate 1 includes a middle part 11 and wing plate parts 12 located on both sides of the middle part 11. The structure of the wing plate parts 12 is symmetrical along the center line of the middle part 11. A rolling groove 3 is provided on the wing plate parts 12. The rolling groove 3 passes through the front and rear sides of the wing plate parts 12. The end of the rolling groove 3 away from the middle part 11 is higher than the end of the rolling groove 3 near the middle part 11. A rolling shaft 4 is inserted in the rolling groove 3. The rolling shaft 4 is perpendicular to the plane where the rolling groove 3 is located. The two ends of the rolling shaft 4 are perpendicularly connected to the top of the clamping block 2. The structure of the clamping block 2 is symmetrical along the centerline of the middle part 11. The clamping block 2 includes a sliding plate 21, a connecting block 22, and a clamping block 23. There are two sliding plates 21, one of which is located on the front side of the wing plate part 12 and the other is located on the rear side of the wing plate part 12. The sliding plate 21 is provided with a sliding hole 211, and one end of the rolling shaft 4 is inserted into the sliding hole 211. The bottom of the sliding plate 21 is connected to the top of the connecting block 22, the bottom of the connecting block 22 is perpendicularly connected to one end of the clamping block 23, and the other end of the clamping block 23 is close to the other clamping block 23. A flange 5 is provided above the clamping block 23. The flange 5 is located below the middle part 11, and the movement stroke of the flange 5 is up and down.

[0037] The top of the flange 5 is connected to the bottom of the lead screw 51, the diameter of the lead screw 51 is smaller than the diameter of the flange 5, and the top of the lead screw 51 is connected to the bottom of the handle 52, the diameter of the handle 52 is larger than the diameter of the lead screw 51.

[0038] The middle part of the lead screw 51 is threadedly connected to the middle part of the lead screw connecting block 53; The lead screw connecting block 53 includes a flat block portion 531 and a semi-cylindrical block portion 532. The semi-cylindrical block portion 532 is provided with a lead screw hole 533, which is a through hole penetrating the top and bottom ends of the semi-cylindrical block portion 532. The inner surface of the lead screw hole 533 is evenly distributed with internal threads. A lead screw 51 is inserted into the lead screw hole 533. The outer surface of the lead screw 51 is evenly distributed with external threads. The lead screw hole 533 and the lead screw 51 are threadedly connected. The flat block portion 531 is connected to the middle portion 11.

[0039] The top of the handle 52 is also provided with a toggle bar 54, which is located on the middle part of the handle 52 near the edge, and the bottom of the toggle bar 54 is vertically connected to the top of the handle 52.

[0040] The distance from the lead screw hole 533 to the middle part 11 is 25 to 35 millimeters.

[0041] The number of rolling grooves 3 on the wing plate portion 12 is two, and the distance between adjacent rolling grooves 3 on the wing plate portion 12 is the width of one to two rolling grooves 3.

[0042] The inclination angle between the rolling groove 3 and the horizontal line is 10 to 20 degrees, and the inclination angle between the bottom of the wing plate portion 12 and the horizontal line is 10 to 20 degrees.

[0043] The length of the rolling groove 3 is 100 to 300 mm, and the width of the rolling groove 3 is 20 to 100 mm; The length of the rolling shaft 4 is 100-150 mm.

[0044] The top center of the wing plate 12 is connected to the bottom of the lifting block 6. The middle of the lifting block 6 is provided with a lifting hole 61, which is a through hole that passes through the front and rear sides of the lifting block 6.

[0045] The clamping block 23 has a chamfered surface 7 at one end near the flange 5. The chamfered surface 7 and the top surface of the clamping block 23 form a top angle 71 with a degree of 130 to 160 degrees. The chamfered surface 7 and the side of the clamping block 23 near the flange 5 form a side angle 72 with a degree of 130 to 160 degrees.

[0046] The following are supplementary descriptions of the present invention: The design of this invention is as follows: This invention is a further optimization of the existing lifting clamps for H-beams 8. Existing lifting clamps for H-beams 8 generally suffer from operational difficulties and complex structures, and the locking of the H-beams 8 during lifting may not be secure enough, affecting not only the stability and smoothness of the lifting process but also potentially creating significant safety hazards. Therefore, this design optimizes the structure of the existing lifting clamps, utilizing not only the weight of the H-beams 8 themselves to lock the web 81 of the H-beams but also further securing the flanges 82 of the H-beams through the flanges 5. This invention not only enables efficient lifting operations but also ensures stability and smoothness during lifting, avoiding safety hazards; it also makes the stress on the flanges 82 of the H-beams more stable, preventing deformation and damage.

[0047] The multi-size H-beams 8 described in this invention are those with different thicknesses of the web 81 and different widths of the flanges 82. For example, this invention applies to H-beams 8 with a web 81 thickness of 6 mm and a flange 82 width of 100 mm; this invention also applies to H-beams 8 with a web 81 thickness of 6 mm and a flange 82 width of 150 mm; this invention further applies to H-beams 8 with a web 81 thickness of 8 mm and a flange 82 width of 200 mm.

[0048] Example 1: Please see Figure 1 — Figure 13 A lifting clamp adaptable to H-beams of various sizes, the clamp comprising a flat plate 1 and clamping blocks 2; the flat plate 1 includes a middle section 11 and wing plate sections 12 located on both sides of the middle section 11, the structure of the wing plate sections 12 being symmetrical along the centerline of the middle section 11; a rolling groove 3 is provided on the wing plate section 12, the rolling groove 3 penetrating the front and rear sides of the wing plate section 12, the end of the rolling groove 3 away from the middle section 11 being higher than the end of the rolling groove 3 near the middle section 11, a rolling shaft 4 inserted in the rolling groove 3, the rolling shaft 4 being perpendicular to the plane of the rolling groove 3, and both ends of the rolling shaft 4 being perpendicularly connected to the top of the clamping blocks 2; the structure of the clamping blocks 2 is symmetrical along the centerline of the middle section 11, the clamping blocks 2... It includes a sliding plate 21, a connecting block 22, and a clamping block 23; there are two sliding plates 21, one of which is located on the front side of the wing plate portion 12 and the other is located on the rear side of the wing plate portion 12. Each sliding plate 21 is provided with a sliding hole 211, and one end of a rolling shaft 4 is inserted into the sliding hole 211; the bottom of the sliding plate 21 is connected to the top of the connecting block 22, the bottom of the connecting block 22 is perpendicularly connected to one end of the clamping block 23, and the other end of the clamping block 23 is close to the other clamping block 23; a flange 5 is provided above the clamping block 23, and the flange 5 is located below the middle portion 11. The movement stroke of the flange 5 is vertical movement.

[0049] In application, first suspend the invention at the lifting point of the H-beam 8, then move the clamping blocks 23 (or connecting blocks 22) to both sides of the clamp so that the opening between the two clamping blocks 23 is larger than the length of the H-beam flange 82. Then lower the invention until the vertical height of the H-beam flange 82 is higher than the height of the top of the clamping blocks 23. At this time, the H-beam flange 82 is located below the middle part 11. Then move the two clamping blocks 23 closer to the H-beam flange 82, so that the clamping blocks 23 contact the H-beam web 81 from both sides. Then, the flange 5 is moved downwards until it connects with the top of the H-beam flange 82. The H-beam 8 is then lifted a certain distance and the lifting is stopped. During this process, the H-beam 8 exerts a downward force on the clamping block 23 due to its gravity. The clamping block 23, through the connecting block 22, causes the rolling shaft 4 to move downwards within the rolling groove 3. Because the rolling shaft 4 has a downward tendency, it causes the clamping block 23 to move closer to the web of the H-beam 81, achieving the effect of locking the web of the H-beam 81 using the gravity of the H-beam 8 itself. The rolling shaft 4... The H-beam 8 rolls within the rolling groove 3, allowing the distance between the two clamping blocks 23 to increase or decrease, thus enabling the clamping of H-beam webs 81 of different sizes. This rolling process is relatively smooth, ensuring that the clamping blocks 23 generate a stable clamping force on the H-beam web 81. Then, the stability of the H-beam 8 is observed. Once the H-beam 8 is stable, the flange 5 is moved downwards and pressed onto the H-beam flange 82. There are two flanges 5, one located at the front of the middle section 11 and the other at the rear. The flange 5 applies a downward force to the H-beam flange 82 to make it more stable. After confirming that all parts of the H-beam 8 are stable and locked, the hoisting operation begins. After hoisting, the H-beam 8 is placed in the designated position. Then, the flange 5 is moved upward, and then the entire invention is moved downward. After the top of the clamping block 23 separates from the bottom of the H-beam flange 82, the two clamping blocks 23 are moved to both sides of the invention. When the opening in the middle of the clamping block 23 is greater than the length of the H-beam flange 82, the invention is moved upward to separate the invention from the H-beam 8.

[0050] Example 2: The basic content is the same as in Example 1, except that: Please see Figure 1 — Figure 13The top of the flange 5 is connected to the bottom of the lead screw 51, and the diameter of the lead screw 51 is smaller than the diameter of the flange 5. The top of the lead screw 51 is connected to the bottom of the handle 52, and the diameter of the handle 52 is larger than the diameter of the lead screw 51. The middle part of the lead screw 51 is threadedly connected to the middle part of the lead screw connecting block 53. The lead screw connecting block 53 includes a flat block portion 531 and a semi-cylindrical block portion 532. The semi-cylindrical block portion 532 is provided with a lead screw hole 533, which is a through hole penetrating the top and bottom ends of the semi-cylindrical block portion 532. The inner surface of the lead screw hole 533 is evenly distributed with internal threads, and the lead screw 51 is inserted into the lead screw hole 533. The outer surface of the lead screw 51 is evenly distributed with external threads, and the lead screw hole 533 is threadedly connected to the lead screw 51. The flat block portion 531 is connected to the middle portion 11. The top of the handle 52 is also provided with a toggle bar 54, which is located on the edge of the middle part of the handle 52. The bottom of the toggle bar 54 is perpendicularly connected to the top of the handle 52. The distance from the lead screw hole 533 to the middle part 11 is 25 to 35 mm.

[0051] In application, when flange 5 needs to move up and down, the actuating bar 54 rotates around the axis of handle 52, which in turn drives the handle to rotate around its axis. This causes the middle part of lead screw 51 to rotate within lead screw connecting block 53, thus achieving the effect of raising or lowering lead screw 51. Lead screw 52 then drives flange 5 to rise or fall. The threaded connection between lead screw 52 and lead screw connecting block 53 not only provides a secure connection but also allows the position of lead screw 52 to be locked, meaning that movement of flange 5 will not cause movement of lead screw 52. The handle diameter is preferably 40 mm; a handle that is too small will make it difficult to achieve the rotation effect. If the handle is too large, it will increase the overall weight of the invention; the diameter of the lead screw connecting block 53 is preferably 60 mm, and the thickness of the lead screw connecting block 53 is preferably one-quarter to one-third of the thickness of the middle part 11. If the lead screw connecting block 53 is too thin, it may result in a smaller force exerted by the flange 5 on the H-shaped steel flange 82 and insufficient locking force on the H-shaped steel flange 82. If the lead screw connecting block 53 is too thick, it will increase the overall weight of the invention; the diameter of the flange 5 is preferably half the width of the H-shaped steel flange 82, so that there is sufficient contact area between the flange 5 and the H-shaped steel flange 82, thereby fixing it more firmly.

[0052] Example 3: The basic content is the same as in Example 1, except that: Please see Figure 1 — Figure 9The wing plate portion 12 has two rolling grooves 3, and the spacing between adjacent rolling grooves 3 on the wing plate portion 12 is the width of one to two rolling grooves 3. The inclination angle of the rolling groove 3 with the horizontal line is 10 to 20 degrees, and the inclination angle of the bottom of the wing plate portion 12 with the horizontal line is 10 to 20 degrees. The length of the rolling groove 3 is 100 to 300 mm, and the width of the rolling groove 3 is 20 to 100 mm; the length of the rolling shaft 4 is 100 to 150 mm.

[0053] In application, compared to having only one rolling groove 3 and rolling shaft 4 on the wing plate portion 12, having two rolling grooves 3 and rolling shaft 4 provides greater stability, ensuring the sidewalls of the clamping block 23 remain vertical and increasing the horizontal stability of the invention. However, an excessive number of rolling grooves 3 and rolling shafts 4 would result in an excessively high invention, increasing its overall weight. The preferred spacing between the two rolling grooves 3 is the width of one or two rolling grooves 3. If the spacing is less than the width of one rolling groove 3, insufficient strength may occur, causing the H-beam 8 to break the rolling groove 3. If the spacing is greater than two rolling grooves 3, the overall dimensions of the invention will increase. The inclination angle between the rolling groove 3 and the horizontal line is 10 to 20 degrees. When the inclination angle is less than 10 degrees, the force exerted by the clamping block 23 on the web plate 81 of the H-beam steel by gravity becomes smaller, resulting in poor stability when lifting the H-beam steel 8. When the inclination angle is greater than 20 degrees, the rolling groove 3 becomes higher, resulting in a longer and taller overall size of the invention. When the diameter of the rolling shaft 4 is slightly smaller than the width of the rolling groove 3 by 0.1 to 0.3 mm, it can rotate better. The two ends of the rolling shaft 4 can also be provided with clamping parts 41, the diameter of which is larger than the diameter of the sliding hole 211, thereby preventing the rolling shaft 4 from coming out of the sliding hole 211.

[0054] Example 4: The basic content is the same as in Example 1, except that: Please see Figure 1 — Figure 9 The top center of the wing plate 12 is connected to the bottom of the lifting block 6. The middle of the lifting block 6 is provided with a lifting hole 61, which is a through hole that passes through the front and rear sides of the lifting block 6.

[0055] In application, when it is necessary to lift the H-beam 8, rope-like components are threaded through both lifting holes 61, one end of the rope-like component is fixed, and then the fixed end of the rope-like component is raised. The invention can be raised through the rope-like component, thereby lifting the H-beam 8. The lifting block 6 and the lifting hole 61 are symmetrically arranged, so the invention is subjected to uniform force.

[0056] Example 5: The basic content is the same as in Example 1, except that: Please see Figure 1 — Figure 7 The clamping block 23 has a chamfered surface 7 at one end near the flange 5. The chamfered surface 7 and the top surface of the clamping block 23 form a top angle 71 with a degree of 130 to 160 degrees. The chamfered surface 7 and the side of the clamping block 23 near the flange 5 form a side angle 72 with a degree of 130 to 160 degrees.

[0057] In application, since the web 81 and flange 82 of the H-beam are connected by welding, there is a weld at the connection between the web 81 and flange 82. This connection is not a right angle. Without the chamfer 7, the angle between the top and side surfaces of the clamping block 23 would be a right angle. This right angle would press against the weld, causing the weld to be squeezed and deformed, which would affect the stability of the H-beam 8. After the chamfer 7 is set, the chamfer 7 will not squeeze the weld, that is, it will not affect the stability of the H-beam 8.

[0058] Example 6: The basic content is the same as in Example 1, except that: Please see Figure 1 — Figure 13 In application, when the width of the H-beam flange 82 is small, the clamping blocks 23 are moved to both sides, allowing the H-beam flange 82 to enter the interior of the invention between the two clamping blocks 23. When the width of the H-beam flange 82 is large, the clamping blocks 23 are moved to both sides a greater distance (up to the top of the rolling groove 3). At this time, the distance between the two clamping blocks 23 becomes larger, so the wider H-beam flange 82 can enter the interior of the invention between the two clamping blocks 23. When the thickness of the H-beam web 81 is small, the clamping blocks 23 move from the H-beam... The web 81 is clamped on both sides of the H-beam web 81. At this time, the rolling shaft 4 is positioned slightly below the rolling groove 3, according to the thickness of the H-beam web 81. When the thickness of the H-beam web 81 is large, the clamping block 23 still clamps the H-beam web 81 from both sides. At this time, the rolling shaft 4 is positioned slightly above the rolling groove 3, according to the thickness of the H-beam web 81. The rolling shaft 4, which rolls in the rolling groove 3, will drive the clamping block 23 to move, so that the spacing of the clamping block 23 can be increased or decreased, thus clamping H-beams 8 of various sizes.

[0059] The above description is only a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiments. Any equivalent modifications or changes made by those skilled in the art based on the content disclosed in the present invention should be included within the scope of protection set forth in the claims.

Claims

1. A lifting clamp adaptable to H-beams of various sizes, characterized in that: The clamp includes a flat plate (1) and a clamping block (2); The flat plate (1) includes a middle part (11) and wing plate parts (12) located on both sides of the middle part (11). The structure of the wing plate parts (12) is symmetrical along the center line of the middle part (11). A rolling groove (3) is provided on the wing plate parts (12). The rolling groove (3) passes through the front and rear sides of the wing plate parts (12). The end of the rolling groove (3) away from the middle part (11) is higher than the end of the rolling groove (3) close to the middle part (11). A rolling shaft (4) is inserted in the rolling groove (3). The rolling shaft (4) is perpendicular to the plane where the rolling groove (3) is located. The two ends of the rolling shaft (4) are perpendicularly connected to the top of the clamping block (2). The structure of the clamping block (2) is symmetrical along the center line of the middle part (11). The clamping block (2) includes a sliding plate (21), a connecting block (22), and a clamping block (23). There are two sliding plates (21), one of which is located on the front side of the wing plate part (12) and the other is located on the rear side of the wing plate part (12). The sliding plate (21) is provided with a sliding hole (211), and one end of the rolling shaft (4) is inserted into the sliding hole (211). The bottom of the sliding plate (21) is connected to the top of the connecting block (22), the bottom of the connecting block (22) is perpendicularly connected to one end of the clamping block (23), and the other end of the clamping block (23) is close to the other clamping block (23). A flange (5) is provided above the clamping block (23), and the flange (5) is located below the middle part (11). The movement stroke of the flange (5) is up and down.

2. The lifting clamp for H-beams of various sizes according to claim 1, characterized in that: The top of the flange (5) is connected to the bottom of the lead screw (51), the diameter of the lead screw (51) is smaller than the diameter of the flange (5), the top of the lead screw (51) is connected to the bottom of the handle (52), the diameter of the handle (52) is larger than the diameter of the lead screw (51).

3. A lifting clamp for H-beams of various sizes according to claim 2, characterized in that: The middle part of the lead screw (51) is threadedly connected to the middle part of the lead screw connecting block (53); The lead screw connecting block (53) includes a block flat part (531) and a block semi-cylindrical part (532). The block semi-cylindrical part (532) is provided with a lead screw hole (533). The lead screw hole (533) is a through hole that passes through the top and bottom ends of the block semi-cylindrical part (532). The inner surface of the lead screw hole (533) is evenly distributed with internal threads. A lead screw (51) is inserted into the lead screw hole (533). The outer surface of the lead screw (51) is evenly distributed with external threads. The lead screw hole (533) and the lead screw (51) are threadedly connected. The block flat part (531) is connected to the middle part (11).

4. A lifting clamp for H-beams of various sizes according to claim 3, characterized in that: The top of the handle (52) is also provided with a toggle bar (54), which is located on the edge of the middle part of the handle (52), and the bottom of the toggle bar (54) is vertically connected to the top of the handle (52).

5. A lifting clamp for H-beams of various sizes according to claim 4, characterized in that: The distance from the lead screw hole (533) to the middle part (11) is 25 to 35 mm.

6. A lifting clamp for H-beams of various sizes according to claim 1, characterized in that: The number of rolling grooves (3) on the wing plate portion (12) is two, and the distance between adjacent rolling grooves (3) on the wing plate portion (12) is the width of one rolling groove (3) to two rolling grooves (3).

7. A lifting clamp for H-beams of various sizes according to claim 6, characterized in that: The inclination angle between the rolling groove (3) and the horizontal line is 10 to 20 degrees, and the inclination angle between the bottom of the wing plate (12) and the horizontal line is 10 to 20 degrees.

8. A lifting clamp for H-beams of various sizes according to claim 7, characterized in that: The length of the rolling groove (3) is 100 to 300 mm, and the width of the rolling groove (3) is 20 to 100 mm; The length of the rolling shaft (4) is 100-150 mm.

9. A lifting clamp for H-beams of various sizes according to claim 1, characterized in that: The top center of the wing plate (12) is connected to the bottom of the lifting block (6). The middle part of the lifting block (6) is provided with a lifting hole (61), which is a through hole that passes through the front and rear sides of the lifting block (6).

10. A lifting clamp for H-beams of various sizes according to claim 1, characterized in that: The clamping block (23) has a chamfered surface (7) at one end near the flange (5). The chamfered surface (7) and the top surface of the clamping block (23) form a top angle (71), the degree of which is 130 degrees to 160 degrees. The chamfered surface (7) and the side of the clamping block (23) facing the flange (5) form a side angle (72), the degree of which is 130 degrees to 160 degrees.

Images