A lifting fixture and a lifting device thereof

Abstract

The present invention relates to the field of hoisting technology, and in particular to a hoisting clamp and a hoisting device thereof. The hoisting device clamps a hoisting pipe through the hoisting clamp when in use; the hoisting clamp comprises a hanging seat, a hoisting mechanism and a first adjusting mechanism, the hoisting mechanism comprises two connecting arms, two clamping arms and two clamping claws, the first ends of the two connecting arms are hinged on the hanging seat, and the hinge points coincide, the first ends of the two clamping arms are respectively hinged on the second ends of the two connecting arms, the two clamping claws are respectively hinged on the second ends of the two clamping arms, the two clamping arms are cross-hinged, the clamping arms are divided into an upper half and a lower half by the intersection, the length of the lower half can be changed, the first adjusting mechanism is used to adjust the length of the lower half according to the weight of the pipe, so that when the weight of the pipe is heavier, the length of the lower half is adjusted to be shorter, thereby ensuring that the clamping claws have a suitable clamping force on the pipe and ensuring the clamping effect.

Description

Technical Field

[0001] The invention relates to the technical field of hoisting, in particular to a hoisting clamp and a hoisting device thereof. Background Art

[0002] Lifting is a process of lifting and moving heavy objects to a designated location using mechanical equipment. It is widely used in construction, industrial manufacturing and other fields.

[0003] According to different engineering requirements and site conditions, the lifting method and equipment selection will be different. When lifting the pipeline, self-weight lifting clamps are often used. In the related technology, for example, Chinese patent CN217516521U discloses a self-locking and fixed lifting device for cylindrical workpieces. The self-locking and fixed lifting device for cylindrical workpieces includes a lifting drive component and a clamping connection component. The lifting drive component and the clamping connection component are movably connected to each other, and can convert the vertical upward lifting force acting on the lifting drive component from the outside into a clamping force acting on the outer peripheral wall of the cylindrical workpiece by the clamping connection component, thereby realizing the clamping and fixing effect on the cylindrical workpiece during the lifting process.

[0004] Although the above-mentioned cylindrical workpiece self-locking fixed lifting device can realize the lifting of the pipeline, it is found in actual use that when clamping a pipeline with a smaller diameter, the opening angle of the clamping connection component is smaller, resulting in excessive clamping force, which is easy to damage the pipeline; when clamping a pipeline with a larger diameter, the opening angle of the clamping connection component is larger, resulting in excessive clamping force, which is easy to be unstable. Summary of the invention

[0005] Based on this, it is necessary to provide a lifting clamp and a lifting device thereof to address the problem of poor clamping and lifting effects in the current pipeline clamping and lifting process.

[0006] The above purpose is achieved through the following technical solutions: A lifting fixture, comprising: Hanging seat; A hoisting mechanism, the hoisting mechanism comprising two connecting arms, two clamping arms and two clamping claws, the first ends of the two connecting arms are hinged to the hanging seat, and the hinge points coincide, the first ends of the two clamping arms are respectively hinged to the second ends of the two connecting arms, the two clamping claws are respectively hinged to the second ends of the two clamping arms, the two clamping arms are cross-hinged, the clamping arms are divided into an upper half and a lower half by the intersection, and the length of the lower half can be changed; The first adjusting mechanism is configured to adjust the length of the lower half according to the weight of the pipeline, so that when the weight of the pipeline is heavier, the length of the lower half is adjusted to be shorter.

[0007] Furthermore, the first adjusting mechanism includes a sensing component and an adjusting component, the sensing component is configured to sense the weight of the pipeline; the adjusting component is configured to change the length of the lower part.

[0008] Furthermore, the sensing component includes an elastic rocker arm and a rotating wheel, the first end of the elastic rocker arm is arranged on the clamping claw, and the second end is suspended; the rotating wheel is arranged at the second end of the elastic rocker arm and can rotate around its own axis, and the rotating wheel initially exceeds the clamping surface of the clamping claw; when the hanging seat is lifted, the rotating wheel and the pipe are abutted, and under the pushing of the pipe, the rotating wheel synchronously drives the elastic rocker arm to swing around its own first end, and the rotating wheel then rolls along the axial direction of the pipe, and the rolling distance of the rotating wheel is positively correlated with the weight of the pipe.

[0009] Furthermore, the lower half is divided into a first upper section and a first lower section, the first lower section can slide relative to the first upper section along the extension direction of the clamping arm, and a first hydraulic chamber is formed between the first upper section and the first lower section; the adjusting assembly includes a piston sleeve, an adjusting screw and a piston head, the piston sleeve is arranged on the clamping jaw, a piston chamber is formed in the piston sleeve, the piston chamber is connected to the first hydraulic chamber, and both are filled with hydraulic fluid; the first end of the adjusting screw is inserted into the piston sleeve, and the second end is located outside the piston sleeve, and the adjusting screw is configured to be driven by the rotating wheel to rotate synchronously around its own axis elastically; the piston head is inserted into the piston sleeve, and can slide along the extension direction of the piston sleeve, and is spirally sleeved on the first end of the adjusting screw.

[0010] Furthermore, the length of the upper part can be changed; the lifting fixture also includes a second adjustment mechanism, which is configured to adjust the length of the upper part according to the weight of the pipeline, so that the length of the upper part can be adjusted to be longer when the weight of the pipeline is heavier.

[0011] Furthermore, the upper half is divided into a second upper section and a second lower section, the second upper section can slide relative to the second lower section along the extension direction of the clamping arm, and a second hydraulic chamber is formed between the second upper section and the second lower section, and the second hydraulic chamber is filled with hydraulic fluid; the second adjusting mechanism includes a first hydraulic pump, and the first hydraulic pump is configured to be able to fill the second hydraulic chamber with the hydraulic fluid.

[0012] Furthermore, an elastic clamping portion is provided on the clamping surface of the clamping jaw.

[0013] Furthermore, the elastic clamping portion is made of rubber.

[0014] Furthermore, there are two lifting mechanisms, which are symmetrically arranged.

[0015] The invention also provides a hoisting device which adopts a hoisting clamp.

[0016] The beneficial effects of the present invention are: The invention relates to a lifting clamp and a lifting device thereof. When the lifting device is in use, the lifting clamp clamps a lifting pipe. When the lifting clamp is lifted to the top of the pipe and gradually moves upward, due to the weight of the lifting clamp itself, two clamping claws will approach each other under the action of gravity, thereby gradually clamping the pipe. At the same time, a first adjustment mechanism is used to adjust the length of the lower half according to the weight of the pipe, so that when the weight of the pipe is heavier, the length of the lower half is adjusted to be shorter, thereby ensuring that the clamping claws have a suitable clamping force on the pipe, avoiding the problem of insufficient clamping or excessive clamping, and ensuring the clamping effect.

[0017] Furthermore, by providing a second adjustment mechanism, the length of the upper part can be adjusted according to the weight of the pipe during use. When the weight of the pipe is heavier, the length of the upper part can be adjusted to be longer, thereby increasing the clamping force of the clamp on the pipe and improving safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A schematic diagram of the three-dimensional structure of the lifting clamp provided by an embodiment of the present invention when clamping a pipe; Figure 2 for Figure 1 A schematic diagram of the partially enlarged structure at center A; Figure 3 A schematic diagram of the front view structure of the lifting clamp provided by an embodiment of the present invention when clamping a pipe; Figure 4 A schematic diagram of the side structure of the lifting clamp provided by an embodiment of the present invention when clamping a pipe; Figure 5 for Figure 4 Middle BB section view; Figure 6 for Figure 5 A schematic diagram of the partially enlarged structure at C in the middle; Figure 7 for Figure 4 Middle DD section view; Figure 8 A schematic diagram of the top view of the lifting clamp provided by an embodiment of the present invention when clamping a pipe; Fig. 9 for Figure 8 Middle EE section view; Fig.10A schematic diagram of the three-dimensional structure of the adjusting screw and vortex spring of the lifting fixture provided by an embodiment of the present invention during assembly.

[0019] in: 1. Hanging seat; 101. Fixed axis; 2. Lifting mechanism; 201. Connecting arm; 202. Clamping arm; 2021. Upper part; 20211. Second upper subdivision; 20212. Second lower subdivision; 2022. Lower part; 20221. First upper subdivision; 20222. First lower subdivision; 203. Clamping claw; 2031. First mounting hole; 2032. Second mounting hole; 2033. First slide groove; 2034. Elastic clamping part; 301, induction assembly; 3011, elastic swing rod; 30111, mounting ring; 3012, rotating wheel; 30121, synchronization block; 3013, vortex spring; 302, adjustment assembly; 3021, piston sleeve; 3022, adjustment screw; 30221, notch; 3023, piston head; 4. Articulated shaft; 501, a first hydraulic pump; 5011, a second connecting pipe; 6. Pipeline. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0021] The serial numbers assigned to the components herein, such as "first", "second", etc., are only used to distinguish the objects described and do not have any order or technical meaning. The "connection" and "coupling" mentioned herein, unless otherwise specified, include direct and indirect connections (couplings). In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention.

[0022] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0023] like Figures 1 to 10 As shown, the lifting clamp provided by the embodiment of the present invention is used for clamping the lifting pipe 6, and is configured to include a hanging seat 1, a lifting mechanism 2 and a first adjusting mechanism, wherein the lifting mechanism 2 includes two connecting arms 201, two clamping arms 202 and two clamping claws 203, the first ends of the two connecting arms 201 are hinged on the hanging seat 1, and the hinge points coincide, the first ends of the two clamping arms 202 are respectively hinged on the second ends of the two connecting arms 201, the two clamping claws 203 are respectively hinged on the second ends of the two clamping arms 202, the two clamping arms 202 are cross-hinged, and the clamping arms 202 are divided into an upper half 2021 and a lower half 2022 by the intersection, the length of the lower half 2022 can be changed, and the first adjusting mechanism is configured to be able to adjust the length of the lower half 2022 according to the weight of the pipe 6, so that when the weight of the pipe 6 is heavier, the length of the lower half 2022 is adjusted to be shorter.

[0024] Specifically in this embodiment, in order to facilitate the hinge connection of the two connecting arms 201, as shown in FIG. Figure 1 As shown, a fixed shaft 101 is inserted into the interior of the suspension seat 1, and the top end of the connecting arm 201 is rotated and sleeved on the fixed shaft 101 during installation to form a hinged fit; to avoid structural interference, the two connecting arms 201 are staggered along the axial direction of the fixed shaft 101.

[0025] In order to realize the articulation cooperation between the two clamping arms 202, the lifting fixture is configured to further include an articulation shaft 4, such as Figure 1 As shown, the hinge shaft 4 is parallel to the fixed shaft 101 and is located below the fixed shaft 101. The hinge shaft 4 is inserted through the two clamping arms 202 during installation and coincides with the intersection of the two clamping arms 202. To avoid structural interference, the two clamping arms 202 are staggered along the axial direction of the hinge shaft 4. The portion of the clamping arm 202 above the intersection of the two clamping arms 202 is the upper half 2021, and the portion of the clamping arm 202 below the intersection of the two clamping arms 202 is the lower half 2022.

[0026] During use, the lifting clamp is first lifted to the top of the pipe 6, and the two jaws 203 are located on the outer periphery of the pipe 6; then the lifting clamp is driven to move upward. Due to the weight of the lifting clamp itself, the two jaws 203 will approach each other around the hinge shaft 4 under the action of gravity, thereby gradually approaching the pipe 6.

[0027] As the lifting fixture continues to move upward, the clamping jaw 203 will contact the surface of the pipe 6. Under the continuous action of gravity, the clamping jaw 203 will further adjust its position and angle, automatically adapt to the outer diameter of the pipe 6, and achieve a tight fit. At the same time, the length of the lower part 2022 is adjusted according to the weight of the pipe 6 through the first adjustment mechanism, so that when the weight of the pipe 6 is heavier, the length of the lower part 2022 is adjusted to be shorter. At this time, for the same clamping arm 202, it forms a lever-like structure. According to the lever balance principle, the power F1 multiplied by the power arm L1 is equal to the resistance F2 multiplied by the resistance The force arm L2, the power F1 can be specifically regarded as the pulling force of the lifting clamp to move upward, the power arm L1 can be specifically regarded as the length of the upper part 2021, the resistance F2 can be specifically regarded as the clamping force of the clamp 203 on the pipe 6, and the resistance arm L2 can be specifically regarded as the length of the lower part 2022. Then, when the weight of the pipe 6 is heavier, the power F1 will increase accordingly, and the product of the power F1 multiplied by the power arm L1 will become larger. At this time, since the resistance arm L2 is reduced, the resistance F2 will increase, thereby improving the clamping force of the clamp 203 on the pipe 6 and avoiding the problem of insufficient clamping.

[0028] Similarly, when the weight of the pipe 6 is lighter, the length of the lower part 2022 can be adjusted longer by the first adjustment mechanism. At this time, for the same clamping arm 202, a lever-like structure is formed. According to the lever balance principle, the power F1 multiplied by the power arm L1 is equal to the resistance F2 multiplied by the resistance arm L2. When the weight of the pipe 6 is lighter, the power F1 will decrease accordingly, and the product of the power F1 multiplied by the power arm L1 will decrease. At this time, since the resistance arm L2 increases, the resistance F2 will decrease, thereby reducing the clamping force of the clamp 203 on the pipe 6 and avoiding the problem of excessive clamping.

[0029] In some embodiments, the first adjustment mechanism is configured to include a sensing component 301 and an adjustment component 302 , wherein the sensing component 301 is configured to sense the weight of the pipe 6 ; and the adjustment component 302 is configured to change the length of the lower part 2022 .

[0030] During use, the weight of the pipe 6 is sensed by the sensing component 301. When the weight of the pipe 6 is heavier, the length of the lower part 2022 is adjusted shorter by the adjusting component 302, thereby increasing the clamping force of the clamp 203 on the pipe 6 and avoiding the problem of insufficient clamping; when the weight of the pipe 6 is lighter, the length of the lower part 2022 is adjusted longer by the adjusting component 302, thereby reducing the clamping force of the clamp 203 on the pipe 6 and avoiding the problem of excessive clamping.

[0031] In a further embodiment, the sensing component 301 can be configured to include an elastic pendulum 3011 and a rotating wheel 3012, wherein the first end of the elastic pendulum 3011 is arranged on the clamp 203, and the second end is suspended; the rotating wheel 3012 is arranged at the second end of the elastic pendulum 3011, and can rotate around its own axis, and the rotating wheel 3012 initially exceeds the clamping surface of the clamp 203; when the hanging seat 1 is lifted, the rotating wheel 3012 abuts against the pipe 6, and under the push of the pipe 6, the rotating wheel 3012 synchronously drives the elastic pendulum 3011 to swing around its own first end, and the rotating wheel 3012 then rolls along the axial direction of the pipe 6, and the rolling distance of the rotating wheel 3012 is positively correlated with the weight of the pipe 6.

[0032] Specifically in this embodiment, in order to facilitate the installation of the elastic swing rod 3011 and the rotating wheel 3012, as shown in FIG. Figure 2 As shown, a first mounting hole 2031 is opened on the clamping surface of the clamping jaw 203, and the elastic rocker arm 3011 is vertically placed in the first mounting hole 2031 during installation, with the top end arranged at the top of the first mounting hole 2031 and the bottom end arranged in the air, and in order to enable the rotating wheel 3012 to initially exceed the clamping surface of the clamping jaw 203, the elastic rocker arm 3011 is arranged to be inclined from top to bottom in the direction close to the pipe 6.

[0033] To facilitate the installation of the rotating wheel 3012, a mounting ring 30111 is provided at the bottom end of the elastic rocker arm 3011, and the axis of the mounting ring 30111 extends along the water direction. The rotating wheel 3012 has an intermediate shaft and two outer wheels symmetrically arranged at both ends of the intermediate shaft. On the one hand, the rotating wheel 3012 can be rotatably inserted into the mounting ring 30111 through the intermediate shaft, and on the other hand, it ensures that the two outer wheels of the rotating wheel 3012 can contact the outer wall of the pipe 6 at the same time, thereby reducing the uneven force on the rotating wheel 3012 and avoiding jamming and deflection due to excessive force on a single point.

[0034] In a further embodiment, the lower half 2022 is divided into a first upper sub-section 20221 and a first lower sub-section 20222, the first lower sub-section 20222 can slide relative to the first upper sub-section 20221 along the extension direction of the clamping arm 202, and a first hydraulic chamber is formed between the first upper sub-section 20221 and the first lower sub-section 20222; the adjustment assembly 302 can be configured to include a piston sleeve 3021, an adjustment screw 3022 and a piston head 3023, the piston sleeve 3021 is arranged on the clamping jaw 203, and the movable A piston cavity is formed in the piston sleeve 3021, which is connected to the first hydraulic cavity and is filled with hydraulic fluid; the first end of the adjusting screw 3022 is inserted into the piston sleeve 3021, and the second end is located outside the piston sleeve 3021. The adjusting screw 3022 is configured to be driven by the rotating wheel 3012 to rotate elastically around its own axis synchronously; the piston head 3023 is inserted into the piston sleeve 3021, and can slide along the extension direction of the piston sleeve 3021, and is spirally sleeved on the first end of the adjusting screw 3022.

[0035] Specifically in this embodiment, Fig. 9 As shown, the first lower subdivision 20222 has a first mounting sleeve, which is located at the top of the first lower subdivision 20222. The first upper subdivision 20221 is slidably inserted into the first mounting sleeve during installation, and forms a piston-like structure with the first mounting sleeve, so that the first hydraulic chamber is formed in the first mounting sleeve.

[0036] To facilitate the installation of piston sleeve 3021, Figure 2 As shown, a second mounting hole 2032 is opened on the clamp 203, and the piston sleeve 3021 is horizontally placed in the second mounting hole 2032 during installation; to facilitate the connection between the piston chamber and the first hydraulic chamber, the lifting fixture is configured to also include a first connecting pipe, one end of the first connecting pipe is connected to the first mounting sleeve, and the other end is connected to the piston sleeve 3021.

[0037] like Fig.10 As shown, the adjusting screw 3022 is set to a T-shaped structure and has a fixed section and an outer spiral section; Figure 6 As shown, the adjusting screw 3022 is horizontally arranged during installation, and the fixed section is located outside the piston sleeve 3021, and the outer spiral section is inserted into the piston sleeve 3021; ​​to facilitate the installation of the adjusting screw 3022, a first recessed groove is opened on the right side wall of the first mounting hole 2031, and the fixed section of the adjusting screw 3022 is rotated and inserted into the first recessed groove during installation.

[0038] In order to enable the rotating wheel 3012 to synchronously drive the adjusting screw 3022 to rotate, as shown in FIG. Figure 2 As shown, a synchronization block 30121 is provided on the left end surface of the rotating wheel 3012. Figure 6As shown, a first slide groove 2033 is provided on the right side wall of the first mounting hole 2031. The first slide groove 2033 extends up and down and is connected to the first sink groove so that the synchronization block 30121 can be introduced into the first sink groove; Fig.10 As shown, a notch 30221 is provided on the end surface of the fixed section of the adjusting screw 3022 , and the notch 30221 can form a snap fit with the synchronous block 30121 , so that the rotating wheel 3012 can synchronously drive the adjusting screw 3022 to rotate.

[0039] In order to enable the rotating wheel 3012 to rotate elastically so as to realize reset, the sensing component 301 is configured to further include a vortex spring 3013, such as Figure 6 As shown, the vortex spring 3013 is sleeved on the left end portion of the outer spiral section of the adjusting screw 3022 and is fixedly connected between the adjusting screw 3022 and the clamp 203; to facilitate the installation of the vortex spring 3013, a second recessed groove is opened on the left side wall of the second mounting hole 2032, and the vortex spring 3013 is inserted into the second recessed groove during installation, and the left end of the piston sleeve 3021 is sealed and inserted into the second recessed groove to avoid leakage of the hydraulic fluid.

[0040] like Figure 6 As shown, the piston head 3023 is configured as a T-shaped structure and has a piston section and an inner spiral section, wherein the inner spiral section is spirally inserted in the outer spiral section of the adjusting screw 3022 to form a spiral fit with the adjusting screw 3022; the piston section is located on the right side of the inner spiral section and forms a piston-like structure with the piston sleeve 3021, and the piston cavity on the right side of the piston section is filled with hydraulic fluid.

[0041] In order to ensure that the piston head 3023 can only slide on the piston sleeve 3021 but cannot rotate when the adjusting screw rod 3022 rotates, the piston sleeve 3021 and the piston section can be arranged to have a square structure.

[0042] It can be understood that in order to realize that when the adjusting screw 3022 rotates, the piston head 3023 can only slide on the piston sleeve 3021 but cannot rotate. It can also be set that the piston sleeve 3021 and the piston section are both set as circular structures, and a second sliding groove is opened on the inner circumferential wall of the piston sleeve 3021, and the second sliding groove extends along the axial direction of the piston sleeve 3021, and a sliding bulge is set on the circumferential side wall of the piston section, and the sliding bulge is slidably inserted in the second sliding groove during installation; or a second sliding groove is opened on the circumferential side wall of the piston section, and the second sliding groove extends along the axial direction of the piston section, and a sliding bulge is set on the inner circumferential wall of the piston sleeve 3021, and the sliding bulge is slidably inserted in the second sliding groove during installation.

[0043] During use, as the lifting clamp moves upward, the clamp 203 will gradually approach the pipe 6. During this process, the rotating wheel 3012 will first contact the outer wall of the pipe 6, and then synchronously drive the elastic rocker arm 3011 to swing around its own top end under the push of the outer wall of the pipe 6. At this time, under the guidance of the first slide groove 2033, the synchronization block 30121 simultaneously slides inward along the first slide groove 2033. As the elastic rocker arm 3011 swings, when the outer edge of the rotating wheel 3012 moves to be flush with the clamping surface of the clamp 203, the synchronization block 30121 synchronously moves to engage with the notch 30221.

[0044] As the lifting clamp continues to move upward, at this time, due to the longer length of the lower half 2022, the jaws 203 have not yet completely clamped the pipe 6, so that the jaws 203 can move upward relative to the pipe 6, allowing the rotating wheel 3012 to roll on the outer wall of the pipe 6, and the rotating wheel 3012 drives the adjusting screw 3022 to rotate through the clamping connection between the synchronization block 30121 and the notch 30221. The adjusting screw 3022 drives the piston head 3023 to slide in the piston sleeve 3021 through the spiral cooperation between the adjusting screw 3022 and the piston head 3023, thereby sending the hydraulic fluid in the piston sleeve 3021 into the first mounting sleeve through the first connecting pipe, so that the first lower section 20222 slides upward relative to the first upper section 20221 along the extension direction of the clamping arm 202 to gradually shorten the length of the lower half 2022.

[0045] At this time, for the same clamping arm 202, it forms a lever-like structure. According to the lever balance principle, the power F1 multiplied by the power arm L1 is equal to the resistance F2 multiplied by the resistance arm L2. The power F1 can be specifically regarded as the pulling force of the lifting fixture to move upward, the power arm L1 can be specifically regarded as the length of the upper part 2021, the resistance F2 can be specifically regarded as the clamping force of the clamp 203 on the pipe 6, and the resistance arm L2 can be specifically regarded as the length of the lower part 2022. Under the premise that the weight of the pipe 6 remains unchanged, the power F1 remains unchanged, and the product of the power F1 multiplied by the power arm L1 remains unchanged, and the product of the resistance F2 multiplied by the resistance arm L2 remains unchanged. As the length of the lower part 2022 gradually decreases, the resistance F2 will gradually increase, thereby gradually increasing the clamping force of the clamp 203 on the pipe 6.

[0046] When the length of the lower part 2022 is shortened to a point where the clamping force of the clamping jaws 203 on the pipe 6 is appropriate, the rotating wheel 3012 stops rotating, and the clamping jaws 203 clamp the pipe 6 tightly.

[0047] In other embodiments, when the pipe 6 is clamped by the clamp 203 and moves, if the lifting speed changes rapidly and generates a large acceleration, the pipe 6 will be subjected to additional inertial force. This requires that the clamping force of the clamp 203 can overcome the inertial force and prevent the pipe 6 from escaping from the lifting fixture. To solve this problem, the length of the upper part 2021 is adjustable; the lifting fixture also includes a second adjusting mechanism, which is configured to adjust the length of the upper part 2021 according to the weight of the pipe 6, so that the heavier the weight of the pipe 6, the longer the length of the upper part 2021 can be adjusted.

[0048] Specifically in this embodiment, for the same clamping arm 202, it forms a lever-like structure. According to the lever balance principle, the power F1 multiplied by the power arm L1 is equal to the resistance F2 multiplied by the resistance arm L2. The power F1 can be specifically regarded as the pulling force of the lifting fixture to move upward, the power arm L1 can be specifically regarded as the length of the upper part 2021, the resistance F2 can be specifically regarded as the clamping force of the clamp 203 on the pipe 6, and the resistance arm L2 can be specifically regarded as the length of the lower part 2022. Then, when the weight of the pipe 6 is heavier, in order to increase the clamping force of the clamp 203 on the pipe 6, it is necessary to increase the product of the power F1 multiplied by the power arm L1. When the power F1 remains unchanged, this can be achieved by increasing the power arm L1, that is, adjusting the length of the upper part 2021 to be longer.

[0049] In a further embodiment, the upper part 2021 is divided into a second upper part 20211 and a second lower part 20212, and the second upper part 20211 can slide relative to the second lower part 20212 along the extension direction of the clamping arm 202, and a second hydraulic chamber is formed between the second upper part 20211 and the second lower part 20212, and the second hydraulic chamber is filled with hydraulic fluid; the second adjusting mechanism includes a first hydraulic pump 501, and the first hydraulic pump 501 is configured to be able to fill the second hydraulic chamber with hydraulic fluid.

[0050] Specifically in this embodiment, Fig. 9 As shown, the second lower section 20212 has a second mounting sleeve, which is located at the top of the second lower section 20212. The second upper section 20211 is slidably inserted into the second mounting sleeve during installation, and forms a piston-like structure with the second mounting sleeve, so that a second hydraulic chamber is formed in the second mounting sleeve.

[0051] like Figure 3 As shown, the first hydraulic pump 501 is installed at the bottom of the suspension seat 1; to facilitate the connection between the second hydraulic chamber and the first hydraulic pump 501, the lifting fixture is configured to also include a second connecting pipe 5011, one end of the second connecting pipe 5011 is connected to the second mounting sleeve, and the other end is connected to the first hydraulic pump 501.

[0052] During use, after the clamping jaws 203 clamp the pipe 6, the first hydraulic pump 501 is started, and the first hydraulic pump 501 passes the hydraulic fluid into the second mounting sleeve, so that the second upper section 20211 moves outward relative to the second lower section 20212 along the extension direction of the clamping arm 202 to gradually increase the length of the upper section 2021.

[0053] It can be understood that the increased length of the upper part 2021 can be set to be positively correlated with the weight of the pipe 6, that is, the heavier the weight of the pipe 6, the longer the increased length of the upper part 2021, so that the clamping force of the clamp 203 on the pipe 6 is greater, thereby improving safety.

[0054] In other embodiments, an elastic clamping portion 2034 is provided on the clamping surface of the clamping jaw 203 so as to further adapt to the shape of the pipe 6 .

[0055] In a further embodiment, the material of the elastic clamping portion 2034 can be set to rubber, so as to further adapt to the shape of the pipe 6 and further increase the maximum static friction force that can be obtained by the clamping surface, thereby improving safety.

[0056] In other embodiments, in order to improve the stability when clamping the pipe 6 and reduce the wear between the components of the lifting fixture, there are two lifting mechanisms 2 and they are symmetrically arranged.

[0057] Specifically in this embodiment, Figure 1 As shown, the two lifting mechanisms 2 are arranged at intervals along the axial direction of the hinge shaft 4, so that when in use, the pipe 6 can be clamped by four clamps 203 at the same time, so that each clamp 203 shares part of the force, thereby greatly reducing the load borne by a single clamp 203, which not only makes the pipe 6 clamped more stably, eliminates the risk of shaking and slipping, and improves the stability during the lifting process, but also because the components are subjected to uniform and gentle force, effectively reducing the wear caused by mutual friction and extrusion between the components of the lifting fixture under long-term and frequent operation.

[0058] In other embodiments, the sensing component 301 may also be configured to include an elastic rocker 3011 , a rotating wheel 3012 , and a counter; and the regulating component 302 may be configured to include a second hydraulic pump.

[0059] Specifically in this embodiment, the installation position and usage of the elastic rocker arm 3011 and the rotating wheel 3012 are exactly the same as those described above, so they are not repeated here; the counter is used to count the number of rotations of the rotating wheel 3012, thereby facilitating indirect determination of the weight of the pipeline 6; the second hydraulic pump is arranged at the bottom of the hanger 1, and is connected to the first mounting sleeve through the first connecting pipe, so as to facilitate the delivery of hydraulic fluid to the first hydraulic chamber.

[0060] It is understandable that the second hydraulic pump can be configured to be the same hydraulic pump as the first hydraulic pump 501 to simplify the structure.

[0061] In other embodiments, the clamping surface of the clamping jaw 203 can be configured as an arc or curved structure that matches the shape of the pipe 6, so that it can fit closely to the pipes 6 of different diameters, thereby improving the clamping effect.

[0062] Another embodiment of the present invention further provides a lifting device, which adopts a lifting fixture.

[0063] Specifically in this embodiment, the lifting device can be set as a crane or a trolley, and the crane or the trolley is connected by a sling and a lifting clamp when in use.

[0064] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0065] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. A lifting fixture, characterized in that: The lifting fixture comprises: Hanging seat; A hoisting mechanism, the hoisting mechanism comprising two connecting arms, two clamping arms and two clamping claws, the first ends of the two connecting arms are hinged to the hanging seat, and the hinge points coincide, the first ends of the two clamping arms are respectively hinged to the second ends of the two connecting arms, the two clamping claws are respectively hinged to the second ends of the two clamping arms, the two clamping arms are cross-hinged, the clamping arms are divided into an upper half and a lower half by the intersection, and the length of the lower half can be changed; The first adjusting mechanism is configured to adjust the length of the lower half according to the weight of the pipeline, so that when the weight of the pipeline is heavier, the length of the lower half is adjusted to be shorter.

2. The lifting fixture according to claim 1, characterized in that: The first adjustment mechanism includes a sensing component and an adjustment component. The sensing component is configured to sense the weight of the pipeline; the adjustment component is configured to change the length of the lower part.

3. The lifting fixture according to claim 2, characterized in that: The sensing component includes an elastic swing rod and a rotating wheel, wherein the first end of the elastic swing rod is arranged on the clamping claw, and the second end is suspended; the rotating wheel is arranged at the second end of the elastic swing rod and can rotate around its own axis, and the rotating wheel initially exceeds the clamping surface of the clamping claw; when the hanging seat is lifted, the rotating wheel abuts against the pipeline, and under the pushing of the pipeline, the rotating wheel synchronously drives the elastic swing rod to swing around its own first end, and the rotating wheel then rolls along the axial direction of the pipeline, and the rolling distance of the rotating wheel is positively correlated with the weight of the pipeline.

4. The lifting fixture according to claim 3, characterized in that: The lower half is divided into a first upper section and a first lower section, the first lower section can slide relative to the first upper section along the extension direction of the clamping arm, and a first hydraulic chamber is formed between the first upper section and the first lower section; the adjusting assembly includes a piston sleeve, an adjusting screw and a piston head, the piston sleeve is arranged on the clamping jaw, a piston chamber is formed in the piston sleeve, the piston chamber is connected to the first hydraulic chamber, and both are filled with hydraulic fluid; the first end of the adjusting screw is inserted into the piston sleeve, and the second end is located outside the piston sleeve, and the adjusting screw is configured to be driven by the rotating wheel to rotate synchronously around its own axis elastically; the piston head is inserted into the piston sleeve, and can slide along the extension direction of the piston sleeve, and is spirally sleeved on the first end of the adjusting screw.

5. The lifting fixture according to claim 1, characterized in that: The length of the upper part can be changed; the lifting fixture also includes a second adjustment mechanism, which is configured to adjust the length of the upper part according to the weight of the pipeline, so that the length of the upper part can be adjusted to be longer when the weight of the pipeline is heavier.

6. The lifting fixture according to claim 5, characterized in that: The upper half is divided into a second upper section and a second lower section, the second upper section can slide relative to the second lower section along the extension direction of the clamping arm, and a second hydraulic chamber is formed between the second upper section and the second lower section, and the second hydraulic chamber is filled with hydraulic fluid; the second adjusting mechanism includes a first hydraulic pump, and the first hydraulic pump is configured to be able to fill the second hydraulic chamber with the hydraulic fluid.

7. The lifting fixture according to claim 1, characterized in that: An elastic clamping portion is arranged on the clamping surface of the clamping jaw.

8. The lifting fixture according to claim 7, characterized in that: The elastic clamping part is made of rubber.

9. The lifting fixture according to claim 1, characterized in that: There are two lifting mechanisms, which are symmetrically arranged.

10. A lifting device, characterized in that: A lifting fixture as described in any one of claims 1 to 9 is used.

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