A hoisting fixture and its hoisting device

Abstract

The present invention relates to the field of hoisting technology, and particularly relates to a hoisting fixture and a hoisting device thereof. When in use, the hoisting device clamps a hoisting pipeline through the hoisting fixture; the hoisting fixture includes a hanging seat, a hoisting mechanism and a first adjusting mechanism. The hoisting mechanism includes two connecting arms, two clamping arms and two clamping jaws. The first ends of the two connecting arms are both 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 jaws are respectively hinged to the second ends of the two clamping arms. The two clamping arms are cross-hinged. The clamping arm is divided into an upper half and a lower half by the intersection point. 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 pipeline, so that when the weight of the pipeline is heavier, the length of the lower half is adjusted to be shorter, thereby ensuring that the clamping jaws have a suitable clamping force on the pipeline and ensuring the clamping effect.

Description

Technical Field

[0001] The present invention relates to the technical field of hoisting, and particularly to a hoisting fixture and a hoisting device thereof. Background Art

[0002] Hoisting is a process of using mechanical equipment to lift heavy objects and move them to designated positions, which is widely used in construction, industrial manufacturing and other fields.

[0003] According to different engineering requirements and on-site conditions, the hoisting method and equipment selection will vary. When hoisting pipelines, self-weight hoisting fixtures are commonly used. In related technologies, for example, Chinese Patent CN217516521U discloses a self-locking fixed hoisting device for cylindrical workpieces. The self-locking fixed hoisting device for cylindrical workpieces includes two parts: a hoisting drive assembly and a clamping connection assembly. The hoisting drive assembly and the clamping connection assembly are movably connected, and can convert the vertically upward lifting force acting on the hoisting drive assembly externally into the clamping force acting on the outer peripheral wall of the cylindrical workpiece by the clamping connection assembly, so as to realize the clamping and fixing effect on the cylindrical workpiece during the hoisting process.

[0004] Although the above-mentioned self-locking fixed hoisting device for cylindrical workpieces can realize the hoisting of pipelines, it is found in actual use that when clamping pipelines with a smaller diameter, the opening angle of the clamping connection assembly is smaller, resulting in too large clamping force and easy damage to the pipeline; when clamping pipelines with a larger diameter, the opening angle of the clamping connection assembly is larger, resulting in too small clamping force and easy instability of clamping. Summary of the Invention

[0005] Based on this, in view of the problem of poor clamping and hoisting effect in the current pipeline clamping and hoisting process, it is necessary to provide a hoisting fixture and a hoisting device thereof.

[0006] The above object is achieved by the following technical solutions:

[0007] A hoisting fixture, the hoisting fixture includes:

[0008] A suspension seat;

[0009] A hoisting mechanism, the hoisting mechanism includes two connecting arms, two clamping arms and two clamping jaws. The first ends of the two connecting arms are both hinged to the suspension 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 jaws are respectively hinged to the second ends of the two clamping arms. The two clamping arms are cross-hinged. The clamping arm is divided into an upper half and a lower half by the intersection point, and the length of the lower half can be changed;

[0010] A first adjustment mechanism, which 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 shorter.

[0011] Further, 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 half.

[0012] Further, the sensing component includes an elastic pendulum rod and a rotating wheel. The first end of the elastic pendulum rod is arranged on the jaw, and the second end is arranged in a suspended manner; the rotating wheel is arranged at the second end of the elastic pendulum rod and can rotate around its own axis. Initially, the rotating wheel exceeds the clamping surface of the jaw; when the suspension seat is lifted, the rotating wheel abuts against the pipeline, and under the pushing of the pipeline, the rotating wheel synchronously drives the elastic pendulum rod to swing around its first end, and then the rotating wheel 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.

[0013] Further, the lower half is divided into a first upper part and a first lower part. The first lower part can slide relative to the first upper part along the extension direction of the clamping arm, and a first hydraulic cavity is formed between the first upper part and the first lower part; the adjustment component includes a piston sleeve, an adjustment screw rod and a piston head. The piston sleeve is arranged on the jaw, a piston cavity is formed in the piston sleeve, the piston cavity is communicated with the first hydraulic cavity, and hydraulic fluid is filled in both of them; the first end of the adjustment screw rod is inserted inside the piston sleeve, and the second end is located outside the piston sleeve. The adjustment screw rod is configured to be elastically rotated around its own axis synchronously driven by the rotating wheel; the piston head is inserted into the piston sleeve and can slide along the extension direction of the piston sleeve, and is helically sleeved on the first end of the adjustment screw rod.

[0014] Further, the length of the upper half can be changed; the lifting fixture further includes a second adjustment mechanism, which is configured to adjust the length of the upper half according to the weight of the pipeline, so that when the weight of the pipeline is heavier, the length of the upper half is adjusted longer.

[0015] Further, the upper half is divided into a second upper part and a second lower part. The second upper part can slide relative to the second lower part along the extension direction of the clamping arm, and a second hydraulic cavity is formed between the second upper part and the second lower part. The second hydraulic cavity is filled with hydraulic fluid; the second adjustment mechanism includes a first hydraulic pump, which is configured to inject the hydraulic fluid into the second hydraulic cavity.

[0016] Furthermore, an elastic clamping portion is provided on the clamping surface of the clamping jaw.

[0017] Furthermore, the material of the elastic clamping portion is rubber.

[0018] Furthermore, the number of the hoisting mechanisms is two and they are symmetrically arranged.

[0019] The present invention also provides a hoisting device which adopts a hoisting fixture.

[0020] The beneficial effects of the present invention are as follows:

[0021] The present invention relates to a hoisting fixture and a hoisting device thereof. When in use, the hoisting device clamps a hoisting pipeline through the hoisting fixture; when the hoisting fixture is hoisted above the pipeline and gradually moved upward, due to the weight of the hoisting fixture itself, the two clamping jaws will approach each other under the action of gravity, so as to gradually clamp the pipeline. At the same time, the first adjusting mechanism adjusts 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 shorter, thereby ensuring that the clamping jaws have a proper clamping force on the pipeline and avoiding the problems of insufficient clamping or excessive clamping, and ensuring the clamping effect.

[0022] Furthermore, by providing a second adjusting mechanism, when in use, the length of the upper half can be adjusted according to the weight of the pipeline, so that when the weight of the pipeline is heavier, the length of the upper half is adjusted longer, thereby increasing the clamping force of the clamping jaws on the pipeline and improving the safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a three-dimensional structural schematic diagram of the hoisting fixture provided by an embodiment of the present invention when clamping a pipeline;

[0024] Figure 2 is Figure 1 a partial enlarged structural schematic diagram at A in

[0025] Figure 3 is a front view structural schematic diagram of the hoisting fixture provided by an embodiment of the present invention when clamping a pipeline;

[0026] Figure 4 is a side view structural schematic diagram of the hoisting fixture provided by an embodiment of the present invention when clamping a pipeline;

[0027] Figure 5 is Figure 4 a sectional view taken along the line B-B in

[0028] Figure 6 is Figure 5 a partial enlarged structural schematic diagram at C in

[0029] Figure 7 is Figure 4D-D sectional view;

[0030] Figure 8 Schematic top view of the lifting fixture provided by the embodiment of the present invention when clamping a pipeline;

[0031] Figure 9 is Figure 8 E-E sectional view;

[0032] Figure 10 Schematic three-dimensional structure view of the adjusting screw and the scroll spring of the lifting fixture provided by the embodiment of the present invention during assembly.

[0033] Wherein:

[0034] 1. Suspension seat; 101. Fixed shaft;

[0035] 2. Lifting mechanism; 201. Connecting arm; 202. Clamping arm; 2021. Upper half; 20211. Second upper part; 20212. Second lower part; 2022. Lower half; 20221. First upper part; 20222. First lower part; 203. Claw; 2031. First mounting hole; 2032. Second mounting hole; 2033. First chute; 2034. Elastic clamping part;

[0036] 301. Induction component; 3011. Elastic swing rod; 30111. Mounting ring; 3012. Rotating wheel; 30121. Synchronization block; 3013. Scroll spring; 302. Adjusting component; 3021. Piston sleeve; 3022. Adjusting screw; 30221. Notch; 3023. Piston head;

[0037] 4. Hinge shaft;

[0038] 501. First hydraulic pump; 5011. Second connecting pipe;

[0039] 6. Pipeline. Detailed implementation manners

[0040] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be 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.

[0041] The serial numbers assigned to the components in this article itself, such as "first", "second", etc., are only used to distinguish the described objects and do not have any sequential or technical meanings. And the "connection" and "coupling" mentioned in this article, unless otherwise specified, both include direct and indirect connection (coupling). In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. is based on the orientation or positional relationship shown in the drawings, and 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 construed as a limitation on the present invention.

[0042] In the present invention, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may be 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, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0043] As Figures 1 to 10 shown, the lifting fixture provided by the embodiment of the present invention is used to clamp the lifting pipeline 6 and is configured to include a suspension seat 1, a lifting mechanism 2 and a first adjustment mechanism. The lifting mechanism 2 includes two connecting arms 201, two clamping arms 202 and two jaws 203. The first ends of the two connecting arms 201 are both hinged to the suspension seat 1, and the hinge points coincide. The first ends of the two clamping arms 202 are respectively hinged to the second ends of the two connecting arms 201. The two jaws 203 are respectively hinged to the second ends of the two clamping arms 202. The two clamping arms 202 are cross-hinged. The clamping arm 202 is divided into an upper half 2021 and a lower half 2022 by the intersection point. The length of the lower half 2022 can be changed. The first adjustment mechanism is configured to be able to adjust the length of the lower half 2022 according to the weight of the pipeline 6, so that when the weight of the pipeline 6 is heavier, the length of the lower half 2022 is adjusted shorter.

[0044] Specifically in this embodiment, for the convenience of hinging the two connecting arms 201, as Figure 1 shown, a fixed shaft 101 is inserted inside the suspension seat 1. When installed, the top ends of the connecting arms 201 are rotatably sleeved on the fixed shaft 101 to form a hinge fit. To avoid structural interference, the two connecting arms 201 are arranged staggeredly along the axis direction of the fixed shaft 101.

[0045] To achieve the articulated cooperation between the two clamping arms 202, the lifting fixture is further provided with a hinge shaft 4. As Figure 1 shown, the hinge shaft 4 is parallel to the fixed shaft 101 and is located below the fixed shaft 101. When installed, the hinge shaft 4 penetrates and is inserted into the two clamping arms 202 and coincides with the intersection point of the two clamping arms 202. To avoid structural interference, the two clamping arms 202 are arranged staggeredly along the axis direction of the hinge shaft 4. And the part of the clamping arm 202 above the intersection point of the two clamping arms 202 is the upper half part 2021, and the part of the clamping arm 202 below the intersection point of the two clamping arms 202 is the lower half part 2022.

[0046] During the use process, first, the lifting fixture is lifted above the pipeline 6, and the two jaws 203 are located on the outer periphery of the pipeline 6. Then, the lifting fixture is driven to move upward. Due to the weight of the lifting fixture itself, the two jaws 203 will approach each other around the hinge shaft 4 under the action of gravity, and thus gradually approach the pipeline 6.

[0047] As the lifting fixture continues to move upward, the jaws 203 will contact the surface of the pipeline 6. Under the continuous action of gravity, the jaws 203 will further adjust their positions and angles to automatically adapt to the outer diameter of the pipeline 6 and achieve a tight clamping. At the same time, the first adjustment mechanism adjusts the length of the lower half part 2022 according to the weight of the pipeline 6, so that when the weight of the pipeline 6 is heavier, the length of the lower half part 2022 is adjusted 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 arm L2. The power F1 can be specifically regarded as the pulling force for the upward movement of the lifting fixture, the power arm L1 can be specifically regarded as the length of the upper half part 2021, the resistance F2 can be specifically regarded as the clamping force of the jaws 203 on the pipeline 6, and the resistance arm L2 can be specifically regarded as the length of the lower half part 2022. Furthermore, when the weight of the pipeline 6 is heavier, the power F1 will increase correspondingly, and the product of the power F1 multiplied by the power arm L1 will become larger. At this time, since the resistance arm L2 decreases, the resistance F2 will increase, so as to improve the clamping force of the jaws 203 on the pipeline 6 and avoid the problem of insufficient clamping.

[0048] Similarly, when the weight of the pipeline 6 is lighter, the first adjustment mechanism adjusts the length of the lower half part 2022 to be longer. 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. When the weight of the pipeline 6 is lighter, the power F1 will decrease correspondingly, 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, so as to reduce the clamping force of the jaws 203 on the pipeline 6 and avoid the problem of excessive clamping.

[0049] In some embodiments, the first adjustment mechanism is configured to include a sensing component 301 and an adjustment component 302. The sensing component 301 is configured to sense the weight of the pipeline 6; the adjustment component 302 is configured to change the length of the lower half 2022.

[0050] During use, the weight of the pipeline 6 is sensed by the sensing component 301. When the weight of the pipeline 6 is heavier, the length of the lower half 2022 is adjusted shorter by the adjustment component 302, so as to improve the clamping force of the clamping jaw 203 on the pipeline 6 and avoid the problem of insufficient clamping; when the weight of the pipeline 6 is lighter, the length of the lower half 2022 is adjusted longer by the adjustment component 302, so as to reduce the clamping force of the clamping jaw 203 on the pipeline 6 and avoid the problem of excessive clamping.

[0051] In a further embodiment, the sensing component 301 can be configured to include an elastic swing rod 3011 and a rotating wheel 3012. The first end of the elastic swing rod 3011 is arranged on the clamping jaw 203, and the second end is arranged in a suspended manner; the rotating wheel 3012 is arranged at the second end of the elastic swing rod 3011 and can rotate around its own axis. The rotating wheel 3012 initially exceeds the clamping surface of the clamping jaw 203; when the suspension seat 1 is lifted, the rotating wheel 3012 abuts against the pipeline 6. Under the pushing of the pipeline 6, the rotating wheel 3012 synchronously drives the elastic swing rod 3011 to swing around its first end, and then the rotating wheel 3012 rolls along the axial direction of the pipeline 6, and the rolling distance of the rotating wheel 3012 is positively correlated with the weight of the pipeline 6.

[0052] Specifically in this embodiment, for the convenience of installing the elastic swing rod 3011 and the rotating wheel 3012, as Figure 2 shown, a first installation hole 2031 is formed in the clamping surface of the clamping jaw 203. When installed, the elastic swing rod 3011 is vertically arranged in the first installation hole 2031, with the top end arranged at the top of the first installation hole 2031 and the bottom end arranged in a suspended manner. In order to make the rotating wheel 3012 initially exceed the clamping surface of the clamping jaw 203, the elastic swing rod 3011 is arranged to be inclined downward and toward the direction close to the pipeline 6.

[0053] For the convenience of installing the rotating wheel 3012, an installation ring 30111 is arranged at the bottom end of the elastic swing rod 3011. The axis of the installation ring 30111 extends in the horizontal direction. The rotating wheel 3012 has a middle shaft and two outer wheels symmetrically arranged at both ends of the middle shaft. On the one hand, the rotating wheel 3012 can be rotationally inserted into the installation ring 30111 through the middle shaft, and on the other hand, it is ensured that the two outer wheels of the rotating wheel 3012 can simultaneously contact the outer peripheral wall of the pipeline 6, reducing the uneven stress of the rotating wheel 3012 and avoiding the problems of jamming and skew due to excessive single-point stress.

[0054] In a further embodiment, the lower half 2022 is divided into a first upper part 20221 and a first lower part 20222. The first lower part 20222 can slide relative to the first upper part 20221 along the extending direction of the clamping arm 202, and a first hydraulic chamber is formed between the first upper part 20221 and the first lower part 20222. The adjusting assembly 302 can be arranged to include a piston sleeve 3021, an adjusting screw 3022 and a piston head 3023. The piston sleeve 3021 is arranged on the jaw 203. A piston chamber is formed in the piston sleeve 3021. The piston chamber is communicated with the first hydraulic chamber, and both are filled with hydraulic fluid. The first end of the adjusting screw 3022 is inserted inside the piston sleeve 3021, and the second end is located outside the piston sleeve 3021. The adjusting screw 3022 is configured to be elastically rotated synchronously around its own axis by the driving of the rotating wheel 3012. The piston head 3023 is inserted into the piston sleeve 3021 and can slide along the extending direction of the piston sleeve 3021, and is helically sleeved on the first end of the adjusting screw 3022.

[0055] Specifically in this embodiment, as Figure 9 shown, the first lower part 20222 has a first mounting sleeve. The first mounting sleeve is located at the top of the first lower part 20222. When installed, the first upper part 20221 is slidably inserted into the first mounting sleeve, and a piston-like structure is formed with the first mounting sleeve, so that the first hydraulic chamber is formed in the first mounting sleeve.

[0056] To facilitate the installation of the piston sleeve 3021, as Figure 2 shown, a second mounting hole 2032 is formed in the jaw 203. When installed, the piston sleeve 3021 is horizontally placed in the second mounting hole 2032. To facilitate the connection between the piston chamber and the first hydraulic chamber, the lifting fixture is further arranged to include a first connecting pipe. One end of the first connecting pipe is communicated with the first mounting sleeve, and the other end is communicated with the piston sleeve 3021.

[0057] As Figure 10 shown, the adjusting screw 3022 is arranged in a T-shaped structure and has a fixed section and an external spiral section. As Figure 6 shown, when installed, the adjusting screw 3022 is horizontally arranged, the fixed section is located outside the piston sleeve 3021, and the external spiral section is inserted into the piston sleeve 3021. To facilitate the installation of the adjusting screw 3022, a first sink is formed on the right side wall of the first mounting hole 2031. When installed, the fixed section of the adjusting screw 3022 is rotatably inserted into the first sink.

[0058] To enable the rotating wheel 3012 to drive the adjusting screw 3022 to rotate synchronously, as Figure 2 shown, a synchronizing block 30121 is arranged on the left end face of the rotating wheel 3012. As Figure 6As shown, a first sliding groove 2033 is formed on the right side wall of the first mounting hole 2031. The first sliding groove 2033 extends vertically and communicates with the first counterbore, so as to be able to guide the synchronization block 30121 into the first counterbore; As Figure 10 shown, a notch 30221 is formed on the end face of the fixed section of the adjusting screw 3022. The notch 30221 can form a clamping fit with the synchronization block 30121, so that the rotating wheel 3012 can drive the adjusting screw 3022 to rotate synchronously.

[0059] To enable the rotating wheel 3012 to rotate elastically for easy resetting, the sensing assembly 301 is further provided with a scroll spring 3013. As Figure 6 shown, the scroll spring 3013 is sleeved on the left end of the outer spiral section of the adjusting screw 3022 and fixedly connected between the adjusting screw 3022 and the clamping jaw 203. To facilitate the installation of the scroll spring 3013, a second counterbore is formed on the left side wall of the second mounting hole 2032. The scroll spring 3013 is inserted into the second counterbore during installation, and the left end of the piston sleeve 3021 is hermetically inserted into the second counterbore to prevent hydraulic fluid leakage.

[0060] As Figure 6 shown, the piston head 3023 is arranged in a T-shaped structure and has a piston section and an inner spiral section. The inner spiral section is spirally inserted into 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.

[0061] To ensure that when the adjusting screw 3022 rotates, the piston head 3023 can only slide in the piston sleeve 3021 and cannot rotate, the piston sleeve 3021 and the piston section can be arranged in a square structure.

[0062] It can be understood that to ensure that when the adjusting screw 3022 rotates, the piston head 3023 can only slide in the piston sleeve 3021 and cannot rotate, the piston sleeve 3021 and the piston section can also be arranged in a circular structure. A second sliding groove is formed on the inner peripheral wall of the piston sleeve 3021 and extends along the axial direction of the piston sleeve 3021. A sliding convex is arranged on the circumferential side wall of the piston section, and the sliding convex is slidably inserted into the second sliding groove during installation; Or a second sliding groove is formed on the circumferential side wall of the piston section and extends along the axial direction of the piston section. A sliding convex is arranged on the inner peripheral wall of the piston sleeve 3021, and the sliding convex is slidably inserted into the second sliding groove during installation.

[0063] During the use process, as the lifting fixture moves upward, the jaw 203 will gradually approach the pipe 6. In this process, the rotating wheel 3012 will first come into contact with the outer peripheral wall of the pipe 6, and then under the pushing of the outer peripheral wall of the pipe 6, it will drive the elastic swing rod 3011 to swing around its top synchronously. At this time, under the guidance of the first chute 2033, the synchronizing block 30121 will slide inward along the first chute 2033 simultaneously. As the elastic swing rod 3011 swings, when the outer edge of the rotating wheel 3012 moves to be flush with the clamping surface of the jaw 203, the synchronizing block 30121 will move synchronously to engage with the notch 30221.

[0064] As the lifting fixture continues to move upward, at this time, due to the longer length of the lower half 2022, the jaw 203 has not fully clamped the pipe 6 yet, so that the jaw 203 can move upward relative to the pipe 6, enabling the rotating wheel 3012 to roll on the outer peripheral wall of the pipe 6. The rotating wheel 3012 drives the adjusting screw 3022 to rotate through the engagement between the synchronizing block 30121 and the notch 30221. The adjusting screw 3022 drives the piston head 3023 to slide in the piston sleeve 3021 through the screw fit with the piston head 3023, thereby sending the hydraulic fluid in the piston sleeve 3021 into the first mounting sleeve through the first connecting pipe, causing the first lower part 20222 to slide upward relative to the first upper part 20221 along the extension direction of the clamping arm 202 to gradually shorten the length of the lower half 2022.

[0065] 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 upward movement of the lifting fixture, the power arm L1 can be specifically regarded as the length of the upper half 2021, the resistance F2 can be specifically regarded as the clamping force of the jaw 203 on the pipe 6, and the resistance arm L2 can be specifically regarded as the length of the lower half 2022. On the premise that the weight of the pipe 6 remains unchanged, the power F1 remains unchanged, so the product of the power F1 multiplied by the power arm L1 remains unchanged. Then the product of the resistance F2 multiplied by the resistance arm L2 remains unchanged. Furthermore, when the length of the lower half 2022 gradually decreases, the resistance F2 will gradually increase, thereby gradually increasing the clamping force of the jaw 203 on the pipe 6.

[0066] When the length of the lower half 2022 is shortened to the point where the clamping force of the jaw 203 on the pipe 6 is appropriate, the rotating wheel 3012 stops rotating. At this time, the jaw 203 clamps the pipe 6 tightly.

[0067] In some other embodiments, during the movement of the pipeline 6 while being clamped by the clamping jaws 203, if the hoisting speed changes rapidly, generating a large acceleration, the pipeline 6 will be subjected to an additional inertial force. This requires the clamping force of the clamping jaws 203 to overcome the inertial force to prevent the pipeline 6 from detaching from the hoisting fixture. To solve this problem, it is set that the length of the upper half 2021 can be changed; the hoisting fixture further includes a second adjustment mechanism configured to adjust the length of the upper half 2021 according to the weight of the pipeline 6, so that when the weight of the pipeline 6 is heavier, the length of the upper half 2021 is adjusted to be longer.

[0068] Specifically in this embodiment, for the same clamping arm 202, which forms a lever-like structure, according to the principle of lever balance, the motive force F1 multiplied by the motive arm L1 is equal to the resistance force F2 multiplied by the resistance arm L2. The motive force F1 can be specifically regarded as the pulling force for the upward movement of the hoisting fixture, the motive arm L1 can be specifically regarded as the length of the upper half 2021, the resistance force F2 can be specifically regarded as the clamping force of the clamping jaws 203 on the pipeline 6, and the resistance arm L2 can be specifically regarded as the length of the lower half 2022. Then, when the weight of the pipeline 6 is heavier, to increase the clamping force of the clamping jaws 203 on the pipeline 6, it is necessary to make the product of the motive force F1 multiplied by the motive arm L1 larger. When the motive force F1 remains unchanged, this can be achieved by increasing the motive arm L1 at this time, that is, adjusting the length of the upper half 2021 to be longer.

[0069] In a further embodiment, it is set that the upper half 2021 is divided into a second upper sub-portion 20211 and a second lower sub-portion 20212. The second upper sub-portion 20211 can slide relative to the second lower sub-portion 20212 along the extending direction of the clamping arm 202, and a second hydraulic chamber is formed between the second upper sub-portion 20211 and the second lower sub-portion 20212, and the second hydraulic chamber is filled with hydraulic fluid; the second adjustment mechanism includes a first hydraulic pump 501 configured to be able to fill the second hydraulic chamber with hydraulic fluid.

[0070] Specifically in this embodiment, as Figure 9 shown, the second lower sub-portion 20212 has a second mounting sleeve located at the top of the second lower sub-portion 20212. When installed, the second upper sub-portion 20211 is slidably inserted into the second mounting sleeve and forms a piston-like structure with the second mounting sleeve, so that the second hydraulic chamber is formed within the second mounting sleeve.

[0071] As Figure 3 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 hoisting fixture is further set to 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.

[0072] During use, after the clamping jaws 203 clamp the pipeline 6, the first hydraulic pump 501 is started. The first hydraulic pump 501 feeds hydraulic fluid into the second mounting sleeve, causing the second upper part 20211 to move outward relative to the second lower part 20212 along the extension direction of the clamping arm 202, so as to gradually increase the length of the upper half 2021.

[0073] It can be understood that the increased length of the upper half 2021 can be set to be positively correlated with the weight of the pipeline 6, that is, the heavier the pipeline 6, the longer the increased length of the upper half 2021, so that the clamping force of the clamping jaws 203 on the pipeline 6 is greater, thereby improving safety.

[0074] In some other embodiments, an elastic clamping portion 2034 is provided on the clamping surface of the clamping jaws 203, so as to further adapt to the shape of the pipeline 6.

[0075] In a further embodiment, the material of the elastic clamping portion 2034 can be set as rubber, so that it can not only further adapt to the shape of the pipeline 6, but also further increase the maximum static friction force that the clamping surface can obtain, thereby improving safety.

[0076] In some other embodiments, in order to improve the stability when clamping the pipeline 6 and reduce the wear between the components of the lifting fixture, the number of the lifting mechanisms 2 is set to two and they are symmetrically arranged.

[0077] Specifically in this embodiment, as Figure 1 shown, the two lifting mechanisms 2 are arranged at intervals along the axis direction of the hinge shaft 4. When in use, the pipeline 6 can be clamped by the four clamping jaws 203 at the same time, so that each clamping jaw 203 shares part of the acting force, and thus the load borne by a single clamping jaw 203 is greatly reduced. This not only makes the pipeline 6 clamped more stably, eliminates the risks of shaking and slipping, and improves the stability during the lifting process, but also effectively reduces the wear caused by the mutual friction and extrusion between the components of the lifting fixture under long-term frequent operation because the forces on each component are uniform and gentle.

[0078] In other embodiments, the sensing assembly 301 can also be set to include an elastic swing rod 3011, a rotating wheel 3012 and a counter; the adjusting assembly 302 can be set to include a second hydraulic pump.

[0079] Specifically in this embodiment, the installation positions and usage manners of the elastic swing rod 3011 and the rotating wheel 3012 are exactly the same as those described above, so they will not be elaborated here; the counter is used to calculate the number of rotations of the rotating wheel 3012, so as to indirectly determine the weight of the pipeline 6; the second hydraulic pump is arranged at the bottom of the lifting seat 1 and is communicated with the first mounting sleeve through a first connecting pipe, so as to facilitate the delivery of hydraulic fluid into the first hydraulic cavity.

[0080] It can be understood that the second hydraulic pump can be set to be the same hydraulic pump as the first hydraulic pump 501 to simplify the structure.

[0081] In some other embodiments, the clamping surface of the jaw 203 can be set to an arc-shaped or curved surface structure adapted to the shape of the pipe 6, so as to be able to closely fit pipes 6 of different diameters and improve the clamping effect.

[0082] Another embodiment of the present invention also provides a hoisting device, which adopts a hoisting fixture.

[0083] Specifically in this embodiment, the hoisting device can be set as a crane or a hoist, and the crane or hoist is connected by a sling and a hoisting fixture during use.

[0084] The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity of description, 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, it should be considered as the scope described in this specification.

[0085] The above-described embodiments only represent several implementation manners of the present invention. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can be made, and these 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; a first adjusting mechanism, wherein 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; The first adjustment mechanism includes a sensing component and an adjustment component, wherein the sensing component is configured to sense the weight of the pipe; and the adjustment component is configured to change the length of the lower portion; The sensing component comprises 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; 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.

2. 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 is adjusted to be longer when the weight of the pipeline is heavier.

3. The lifting fixture according to claim 2, 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.

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

5. The lifting fixture according to claim 4, characterized in that: The material of the elastic clamping part is rubber.

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

7. A lifting device, characterized in that: A lifting fixture as described in any one of claims 1 to 6 is used.

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