Automatic grabbing sling device for crane

Abstract

This invention relates to the field of cranes, specifically to an automatic gripping and lifting device for cranes. The device includes a lifting frame with an adjustable distance mechanism fixedly connected to its bottom. Two symmetrical telescopic frames are installed at both ends of the adjustable distance mechanism. A boom is installed on the outer side of each telescopic frame. The distance between the booms is adjusted according to the length of the pipe being lifted. A vibration mechanism is installed at the bottom of each boom. The two vibration mechanisms are symmetrically arranged. An inner support mechanism is installed inside each vibration mechanism. The inner support mechanism extends outward to support and fix the pipe. The vibration mechanism causes the pipe to vibrate while rotating, dislodging dirt from the inner wall of the pipe. This enables precise gripping of pipes of different lengths, significantly improving the device's adaptability to various pipe specifications. It achieves automatic pipe gripping, reduces manual operation, saves labor costs, and improves the safety and efficiency of lifting operations.

Description

Technical Field

[0001] This invention relates to the field of crane technology, specifically to an automatic gripping and lifting device for cranes. Background Technology

[0002] In industrial production, construction, and logistics, lifting operations often require the grabbing, transfer, and subsequent processing of large pipes. As the crucial connection medium between the lifting machinery and the lifted object, the performance of the lifting device directly affects operational efficiency and safety. Currently, commonly used lifting devices are mainly divided into two categories: hook-type and electromagnetic type. However, in the process of grabbing and transferring large pipes, existing lifting devices have many limitations:

[0003] 1. When using hook-type lifting devices to lift large pipes, the connection position between the hook and the pipe needs to be adjusted manually. This is not only time-consuming and labor-intensive, but also may cause the pipe to be unstable due to human error, which may lead to swaying or even falling, thus increasing the safety hazard of the operation.

[0004] 2. Large pipes vary greatly in length and inner diameter. Traditional lifting tools have a fixed structure and cannot flexibly adjust the gripping spacing or support range, making it difficult to adapt to pipes of different specifications and thus limiting the operating range.

[0005] 3. During storage or use, large pipes are prone to the accumulation of dust, rust and other impurities on their inner walls. If not cleaned in time, these impurities will gradually corrode the inner walls of the pipes, reducing their structural strength and service life. Existing lifting tools can only perform the function of grabbing and transferring, and cannot simultaneously clean the inner walls of the pipes. Additional cleaning equipment is required, which increases the work process and costs. Summary of the Invention

[0006] The purpose of this invention is to provide an automatic gripping and lifting device for cranes, so as to solve the problems mentioned in the background art, such as the inability to automatically grip pipes of various sizes, the lack of impurity removal function, and the impact on the service life of pipes.

[0007] To achieve the above objectives, the present invention provides the following technical solution: an automatic gripping and lifting device for a crane, comprising a lifting frame, a distance adjustment mechanism fixedly connected to the bottom of the lifting frame, two telescopic frames symmetrically mounted at both ends of the distance adjustment mechanism, a lifting rod mounted on the outer side of the telescopic frame, the distance between the lifting rods of the telescopic frame being adjusted according to the length of the pipe being lifted, a vibration mechanism mounted at the bottom of the lifting rod, the two vibration mechanisms being symmetrically arranged, an inner support mechanism mounted on the inner side of the vibration mechanism, the inner support mechanism extending outward to support and fix the pipe, and the vibration mechanism causing the pipe to vibrate while rotating, dislodging dirt from the inner wall of the pipe.

[0008] As a further embodiment of the present invention, the adjusting mechanism includes a support plate fixedly connected to the bottom of the hanger. Slide seats are slidably connected to both sides of the support plate, with the outer side of the slide seats installed on the inner side of the telescopic frame. A first motor is installed at the center of the lower surface of the support plate, and a traction rod is installed at the output end of the first motor. Both ends of the traction rod are connected to one end of a first connecting rod via pins, and the other end of the first connecting rod is connected to the middle of the upper surface of the slide seats via pins. The first motor drives the traction rod to rotate clockwise or counterclockwise, causing the first connecting rod to pull the two slide seats to move simultaneously inward or outward. This allows the inner support mechanism to enter the inner cavity of the pipe from both ends, preventing the pipe from swaying left and right during transport.

[0009] As a further embodiment of the present invention, the vibration mechanism includes a box body installed at the bottom of the boom. A rotating shaft is mounted on the bottom of the inner cavity of the box body via a bearing. A driven gear is keyed to the outer wall of the rotating shaft. A second motor is installed on the top of the left side wall of the box body. A driving gear and a swing assembly are respectively installed on the output end of the second motor from left to right. The driving gear and the driven gear are meshed and connected, and the transmission ratio is greater than 10, so that the rotating shaft and the swing assembly generate a speed difference. The centrifugal force generated when the swing assembly rotates causes the box body to vibrate, thereby causing the pipe to vibrate. At the same time, the pipe rotates. A cleaning assembly is installed on the bottom inner side of the box body. This not only enables the pipe to rotate at low speed, but also allows the swing assembly to rotate at high speed. The low-speed rotation is in harmony with the cleaning assembly blowing away impurities on the inner wall of the pipe. The uneven mass distribution of the swing assembly during centrifugal motion achieves the purpose of vibrating the pipe.

[0010] As a further embodiment of the present invention, the swing assembly includes a centrifugal rod installed at the output end of the second motor. A plurality of locking holes are equidistantly arranged on the right side wall of the centrifugal rod from top to bottom. A positioning unit is engaged within the inner cavity of each locking hole. A centrifugal weight is installed at the right end of the positioning unit. By cooperating with the locking holes and the positioning unit, the rotation diameter of the centrifugal weight is adjusted, thereby changing the centrifugal force generated when the centrifugal weight rotates while the rotation speed of the second motor remains constant, thus controlling the vibration intensity of the box. The purpose is to adjust the distance from the centrifugal weight to the output end of the second motor, thereby changing the vibration intensity and performing vibration impurity removal on pipes of different materials.

[0011] As a further embodiment of the present invention, the positioning unit includes a rod inserted into the inner cavity of the card hole, the right end of the rod being installed with a centrifugal weight, and ball bearings being embedded equidistantly along the outer wall of the rod in the circumferential direction. A compression block and a spring are respectively inserted into the inner cavity of the rod from left to right. Under the action of the spring force, the compression block is pushed to the left, so that the compression block can compress the ball bearings.

[0012] As a further embodiment of the present invention, the left side of the extrusion block is conical in shape.

[0013] As a further embodiment of the present invention, the cleaning component includes a rotary cylinder installed at the bottom of the left side wall of the box body. A nozzle is installed at the output end of the rotary cylinder. An air pump is connected to the nozzle through an air pipe. The rotary cylinder drives the nozzle to rotate, and the nozzle changes the direction of airflow to blow away impurities from the inner wall of the pipe.

[0014] As a further embodiment of the present invention, the inner support mechanism includes a plurality of support rods equidistantly installed at the end of a rotating shaft along the circumferential direction. A hydraulic cylinder is also installed at the center of the end of the rotating shaft. A slider capable of lateral sliding is sleeved on the outer wall of each support rod, and the slider is installed with the output end of the hydraulic cylinder. The hydraulic cylinder drives the slider to slide left and right along the outer wall of the support rod. A central rod is installed at the end of the support rod away from the rotating shaft. The outer wall of the central rod is circumferentially connected to one end of a plurality of second connecting rods by a pin. The other end of the second connecting rod is connected to an inner support plate by a pin. The outer side of the inner support plate has... It has anti-slip ridges to increase the friction when the inner support plate supports the inner wall of the pipe. A guide plate is installed laterally on the left side of the inner support plate, and the guide plate is hollow. The outer wall of the slider is connected to one end of the third link by a pin along the circumferential direction. The intersection of the third link and the second link is connected by a pin. The other end of the third link is equipped with a pin that is inserted into the inner cavity of the guide plate. The pin slides in the guide plate to provide room for the rotation of the third link. By using the cross rotation of the second link and the third link, the inner support plate can move inward or outward at the same time to provide internal support and fixation for pipes with different inner diameters.

[0015] As a further embodiment of the present invention, the rotating shaft and the axis of the central rod are on the same straight line.

[0016] Compared with the prior art, the beneficial effects of the embodiments of the present invention are:

[0017] 1. By telescopically cooperating with the outer rod and the inner rod, and in conjunction with the first motor driving the traction rod and the first connecting rod to move the slide, the distance between the two inner support mechanisms can be flexibly adjusted to achieve precise gripping of pipes of different lengths. This greatly improves the adaptability of the lifting device to various specifications of pipes, eliminating the need to configure separate lifting devices for pipes of specific lengths and reducing equipment costs.

[0018] 2. The hydraulic cylinder drives the slider to slide along the support rod. The relative rotation of the second and third connecting rods causes the inner support plate to extend outward, so that the inner support plate fits tightly against the inner wall of the pipe, realizing automatic gripping of pipes with different inner diameters. The anti-slip ridges on the outer side of the inner support plate further enhance the friction, effectively preventing the pipe from shaking or falling during transportation. This automatic gripping of the pipe reduces manual operation, saving labor costs and improving the safety and efficiency of lifting operations.

[0019] 3. The second motor drives the active gear and driven gear to mesh, creating a speed difference: on the one hand, the rotating shaft drives the pipe to rotate at a low speed, and on the other hand, the centrifugal weight of the swing component performs a high-speed centrifugal motion, using centrifugal force to generate vibration, which causes impurities on the inner wall of the pipe to fall off; in conjunction with the air jet of the rotating nozzle of the cleaning component, the fallen impurities can be thoroughly removed, preventing impurities from corroding the pipe and significantly extending the service life of the pipe. At the same time, the low-speed rotation of the pipe also provides convenience for subsequent welding, flaw detection and other operations, further improving the overall efficiency of the operation. Attached Figure Description

[0020] Figure 1 This is a perspective view of the present invention;

[0021] Figure 2 This is a schematic diagram of the adjusting mechanism structure of the present invention;

[0022] Figure 3 This is a schematic diagram of the vibration mechanism and internal support mechanism of the present invention;

[0023] Figure 4 for Figure 3 Enlarged view of point A in the middle;

[0024] Figure 5 This is a schematic diagram of the vibration mechanism.

[0025] Figure 6 Exploded view of the oscillating component;

[0026] Figure 7 This is a schematic diagram of the cleaning component structure.

[0027] In the diagram: 1. Hanger; 2. Adjustment mechanism; 3. Telescopic frame; 4. Hanging rod; 5. Vibration mechanism; 6. Internal support mechanism; 21. Support plate; 22. Slide seat; 23. First motor; 24. Traction rod; 25. First connecting rod; 31. Outer rod; 32. Inner rod; 33. Insertion hole; 34. Pin; 51. Box body; 52. Rotating shaft; 53. Driven gear; 54. Second motor; 55. Driving gear; 56. Swing. Components; 57. Cleaning component; 561. Centrifugal rod; 562. Clip; 563. Insert rod; 564. Ball bearing; 565. Extrusion block; 566. Spring; 567. Centrifugal weight; 571. Rotary cylinder; 572. Nozzle; 61. Support rod; 62. Hydraulic cylinder; 63. Slider; 64. Center rod; 65. Second connecting rod; 66. Inner support plate; 67. Guide plate; 68. Third connecting rod; 69. Pin. Detailed Implementation

[0028] The technical solution of the present invention will be further described in detail below with reference to specific embodiments.

[0029] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0030] Please see Figures 1-7 In this embodiment of the invention, an automatic gripping and lifting device for a crane includes a lifting frame 1. A distance adjustment mechanism 2 is fixedly connected to the bottom of the lifting frame 1. Two telescopic frames 3 are installed symmetrically at both ends of the distance adjustment mechanism 2. A lifting rod 4 is installed on the outside of the telescopic frame 3. The distance between the lifting rods 4 is adjusted by the telescopic frame 3 according to the length of the pipe being lifted. A vibration mechanism 5 is installed at the bottom of the lifting rod 4. The two vibration mechanisms 5 are arranged symmetrically on the left and right. An inner support mechanism 6 is installed inside the vibration mechanism 5. The pipe is supported and fixed by the inner support mechanism 6 extending outward. The vibration mechanism 5 can make the pipe vibrate while rotating, shaking off dirt from the inner wall of the pipe.

[0031] Furthermore, the adjusting mechanism 2 includes a support plate 21 fixedly connected to the bottom of the hanger 1. Slide seats 22 are slidably connected to both sides of the support plate 21. The slide seats 22 have a rectangular cross-section to improve the stability of sliding between the slide seats 22 and the support plate 21. The outer side of the slide seats 22 is installed on the inner side of the telescopic frame 3. A first motor 23 is installed at the center of the lower surface of the support plate 21. A traction rod 24 is installed at the output end of the first motor 23. Both ends of the traction rod 24 are connected to one end of the first connecting rod 25 by pins. The other end of the first connecting rod 25 is connected to the middle of the upper surface of the slide seats 22 by pins. The first motor 23 drives the traction rod 24 to rotate clockwise or counterclockwise, so that the first connecting rod 25 pulls the two slide seats 22 to move inward or outward at the same time.

[0032] Furthermore, the telescopic frame 3 includes an outer rod 31 installed on the outside of the slide block 22, an inner rod 32 inserted into the inner cavity of the outer rod 31, and the outer side of the inner rod 32 is installed on the top of the hanging rod 4. The outer wall of the inner rod 32 has several insertion holes 33 equidistantly opened from left to right. A pin 34 is inserted through the outer wall of the outer rod 31. When the pin 34 passes through the insertion hole 33, the inner rod 32 is fixed, thereby adjusting the length between the outer rod 31 and the inner rod 32 to achieve the gripping of pipes of different lengths.

[0033] Furthermore, the vibration mechanism 5 includes a box 51 installed at the bottom of the boom 4. A rotating shaft 52 is installed at the bottom of the inner cavity of the box 51 via a bearing. A driven gear 53 is keyed to the outer wall of the rotating shaft 52. A second motor 54 is installed at the top of the left side wall of the box 51. From left to right, the output end of the second motor 54 is equipped with a driving gear 55 and a swing component 56. The driving gear 55 and the driven gear 53 are meshed and connected, and the transmission ratio is greater than 10, which creates a speed difference between the rotating shaft 52 and the swing component 56. The speed of the rotating shaft 52 decreases, causing the pipe to rotate slowly. This not only makes it easier to adjust the rotation angle of the pipe and facilitates the workers' welding, flaw detection and other operations on the pipe, but also helps to clean the inner surface of the pipe. The centrifugal force generated when the swing component 56 rotates causes the box 51 to vibrate, thereby causing the pipe to vibrate and rotate at the same time. A cleaning component 57 is installed at the bottom of the inner side of the box 51.

[0034] More specifically, the output of the second motor 54 synchronously drives the drive gear 55 and the oscillating component 56 to rotate. The drive gear 55 meshes with the driven gear 53 on the rotating shaft 52 (transmission ratio > 10), causing the rotating shaft 52 to rotate at a low speed, which in turn drives the pipe to rotate slowly through the inner support mechanism 6. The oscillating component 56 rotates at high speed with the second motor 54, using the uneven mass distribution of the centrifugal weight 567 to generate centrifugal force, causing the box 51 to vibrate and transmit it to the pipe, shaking off dirt from the inner wall. The rotating nozzle 572 of the cleaning component 57 sprays air synchronously, blowing the shaken-off impurities away from the inner wall of the pipe. Through the speed difference design, the low-speed rotation of the pipe and the high-speed vibration of the oscillating component are coordinated, ensuring that the impurities are shaken off evenly in all areas of the inner wall of the pipe, and facilitating the cleaning component to fully cover the cleaning area.

[0035] Furthermore, the swing assembly 56 includes a centrifugal rod 561 installed at the output end of the second motor 54. The right side wall of the centrifugal rod 561 has several equidistant locking holes 562 from top to bottom. A positioning unit is locked inside the locking hole 562. A centrifugal weight 567 is installed at the right end of the positioning unit. When the centrifugal weight 567 rotates, the mass distribution is uneven, causing the box 51 to vibrate. By cooperating with the positioning unit through the locking hole 562, the rotation diameter of the centrifugal weight 567 is adjusted, thereby changing the centrifugal force generated when the centrifugal weight 567 rotates while the speed of the second motor 54 remains unchanged, and controlling the vibration intensity of the box 51.

[0036] Furthermore, the positioning unit includes a rod 563 inserted into the inner cavity of the locking hole 562. The right end of the rod 563 is installed with a centrifugal weight 567. Ball bearings 564 are equidistantly embedded in the outer wall of the rod 563 along the circumference. A pressing block 565 and a spring 566 are inserted into the inner cavity of the rod 563 from left to right. Under the elastic force of the spring 566, the pressing block 565 is pushed to the left, so that the pressing block 565 can press the ball bearings 564. The left side of the pressing block 565 is conical in shape. The inclined surface of the pressing block 565 can press the ball bearings 564 outward, so that the ball bearings 564 can be locked in the locking hole 562, thereby achieving the purpose of positioning the rod 563.

[0037] More specifically, the centrifugal rod 561 of the swing assembly 56 rotates with the output end of the second motor 54, and the centrifugal weight 567 at its right end is connected to the locking hole 562 on the centrifugal rod 561 through a positioning unit. In the positioning unit, after the insertion rod 563 is inserted into the locking hole 562, the spring 566 pushes the conical extrusion block 565 to the left, and the extrusion ball 564 protrudes from the outer wall of the insertion rod 563 and locks the locking hole 562, thereby fixing the centrifugal weight 567. By selecting locking holes 562 of different heights, the rotation diameter of the centrifugal weight 567 can be changed. When the speed of the second motor 54 remains constant, the vibration intensity can be controlled by adjusting the magnitude of the centrifugal force. The positioning structure of locking hole 562 and ball 564 enables quick disassembly and reassembly and position adjustment of the centrifugal weight 567, which is convenient to operate and has a stable positioning. The vibration intensity can be flexibly adjusted according to the pipe material, such as metal, plastic and the degree of impurity adhesion, to avoid damage to the pipe due to excessive vibration or impurity residue due to insufficient vibration, thereby improving the adaptability of the device to different working conditions.

[0038] Furthermore, the cleaning component 57 includes a rotary cylinder 571 installed at the bottom of the left side wall of the housing 51. A nozzle 572 is installed at the output end of the rotary cylinder 571. An air pump is connected to the nozzle 572 through an air pipe. The rotary cylinder 571 drives the nozzle 572 to rotate, and the nozzle 572 changes the direction of air jet to blow away impurities from the inner wall of the pipe.

[0039] More specifically, the rotary cylinder 571 of the cleaning component 57 drives the nozzle 572 to rotate. The nozzle 572 is connected to an external air pump through an air pipe, and sprays high-pressure airflow onto the inner wall of the pipe during rotation. The rotary cylinder 571 drives the nozzle 572 to rotate at multiple angles, which, together with the slow rotation of the pipe itself, achieves full coverage of the inner wall of the pipe by the direction of the airflow from the nozzle 572. The high-pressure airflow directly acts on the shaken-off impurities, blowing them away from the inner wall of the pipe and expelling them. The rotary airflow design solves the problem of limited cleaning range of fixed-direction airflow, ensuring that impurities in all areas of the inner wall of the pipe can be effectively removed. The airflow cleaning method has no mechanical contact, avoiding scratches on the inner wall of the pipe, and is especially suitable for the processing of precision pipes. At the same time, it reduces the use of cleaning agents and meets environmental protection requirements.

[0040] Furthermore, the internal support mechanism 6 includes several support rods 61 equidistantly installed at the end of the rotating shaft 52 along the circumferential direction. A hydraulic cylinder 62 is also installed at the center of the end of the rotating shaft 52. A slider 63 capable of lateral sliding is sleeved on the outer wall of the support rod 61, and the slider 63 is installed at the output end of the hydraulic cylinder 62. The hydraulic cylinder 62 drives the slider 63 to slide left and right along the outer wall of the support rod 61. A central rod 64 is installed at the end of the support rod 61 away from the rotating shaft 52. The axes of the rotating shaft 52 and the central rod 64 are on the same straight line, allowing the pipe to rotate and preventing centrifugal rotation of the pipe from affecting the cleaning component 57's removal of impurities from the pipe. The outer wall of the central rod 64 is circumferentially connected to one end of several second connecting rods 65 by pins. The other end of the rod 65 is connected to an inner support plate 66 via a pin. The outer side of the inner support plate 66 has anti-slip ridges to increase the friction when the inner support plate 66 supports the inner wall of the pipe. A guide plate 67 is installed laterally on the left side of the inner side of the inner support plate 66. The guide plate 67 is hollow. The outer wall of the slider 63 is connected to one end of the third connecting rod 68 circumferentially via a pin. The intersection of the third connecting rod 68 and the second connecting rod 65 is connected via a pin. The rotation between the second connecting rod 65 and the third connecting rod 68 allows the inner support plate 66 to move inward or outward to adapt to pipes with different inner diameters. The other end of the third connecting rod 68 is equipped with a pin 69 that is inserted into the inner cavity of the guide plate 67. The pin 69 slides in the guide plate 67 to provide room for the rotation of the third connecting rod 68.

[0041] More specifically, during operation, the hydraulic cylinder 62 acts as the driving source, causing the slider 63 to slide laterally along the outer wall of the support rod 61. When the slider 63 moves closer to the central rod 64, the cross rotation of the third connecting rod 68 and the second connecting rod 65 causes the inner support plate 66 to extend outward until it is in close contact with the inner wall of the pipe. When the slider 63 moves away from the central rod 64, the inner support plate 66 retracts inward, releasing the fixation on the pipe. At the same time, the rotating shaft 52 is aligned with the axis of the central rod 64, ensuring that the pipe does not undergo centrifugal rotation during its rotation. The synchronous extension and retraction of the inner support plate 66, driven by the hydraulic cylinder 62, can accommodate pipes of different inner diameters, significantly improving the adaptability of the lifting device to various pipe specifications.

[0042] More specifically, the coaxial design of the rotating shaft 52 and the central rod 64 ensures the stability of the pipe's rotation, avoids the centrifugal rotation from affecting the cleaning effect of the cleaning component 57, and ensures the smooth progress of the cleaning operation.

[0043] More specifically, when the slider 63 slides, the third link 68 rotates relative to the second link 65, and the pin 69 slides within the guide plate 67 to provide space for movement, thereby driving the inner support plate 66 to move outward or inward. The anti-slip ridge on the outer side of the inner support plate 66 contacts the inner wall of the pipe, achieving stable fixation by increasing friction. The cross-rotation structure of the second link 65 and the third link 68 ensures the synchronicity and stability of the movement of the inner support plate 66, making the pipe evenly stressed and avoiding damage to the pipe due to excessive local stress. Through reasonable structural design and component coordination, the inner support mechanism 6 achieves automatic and stable gripping of pipes with different inner diameters, which not only expands the adaptability range of the lifting equipment and reduces manual assistance, but also ensures the safety and efficiency of lifting operations, while providing a stable foundation for subsequent cleaning and other operations.

[0044] Working principle:

[0045] Step 1: Drive the traction rod 24 to rotate clockwise by the first motor 23, and the first connecting rod 25 pulls the two slide blocks 22 to move inward at the same time, so that the inner support mechanism 6 enters the inside of the pipe and realizes the displacement of the inner support plate 66.

[0046] Step 2: The hydraulic cylinder 62 drives the slider 63 to slide inward along the support rod, causing the bottom of the second link 65 and the third link 68 to gradually approach each other. The pin 69 slides in the guide plate 67, leaving space for the third link 68 to move laterally. The inner support plate 66 moves outward until it contacts the inner wall of the pipe, positioning the pipe and achieving automatic gripping of the pipe, thus realizing the transfer of large pipes with different inner diameters.

[0047] Step 3: When it is necessary to clean the impurities on the inner wall of the pipe, the second motor 54 drives the drive gear 55 to rotate. The drive gear 55 and the driven gear 53 drive the rotating shaft 52 to rotate, which in turn causes the inner support plate 66 to drive the pipe to rotate. At the same time, the centrifugal rod 561 drives the centrifugal weight 567 to rotate centrifugally. The centrifugal weight 567 has an uneven mass distribution. The centrifugal inertial force causes the box 51 to vibrate. Energy is transferred through the solid to make the pipe vibrate, shaking off the impurities on the inner wall of the pipe. The rotating cylinder 571 drives the nozzle 572 to rotate, changing the spray angle of the nozzle 572, thereby blowing out the impurities scattered on the inner wall of the pipe and preventing the pipe from being damaged by the impurities.

[0048] Step four: When it is necessary to change the vibration intensity, the insert rod 563 is inserted into the locking holes 562 at different heights. Under the elastic force of the spring 566, the extrusion block 565 is pushed to move. The extrusion block 565 presses the ball 564 outward at an angle. The ball 564 is locked in the locking hole 562, positioning the displaced centrifugal weight 567. Under the condition of constant rotation speed, the magnitude of the centrifugal force generated when the centrifugal weight 567 rotates changes, adjusting the vibration intensity of the pipe. It can remove impurities based on the stubborn characteristics of impurities on the inner wall of the pipe.

[0049] The above are merely preferred embodiments of the present invention. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of the present invention, and these should also be considered within the scope of protection of the present invention. These will not affect the effectiveness of the implementation of the present invention or the practicality of the patent.

Claims

1. An automatic gripping lifting device for a crane, comprising a lifting frame (1), characterized in that, The bottom of the hanger (1) is fixedly connected to the adjusting mechanism (2). Two telescopic frames (3) are installed at both ends of the adjusting mechanism (2) symmetrically. A hanging rod (4) is installed on the outside of the telescopic frame (3). The telescopic frame (3) adjusts the spacing of the hanging rod (4) according to the length of the pipe being lifted. A vibration mechanism (5) is installed at the bottom of the hanging rod (4). The two vibration mechanisms (5) are symmetrically arranged on the left and right. An inner support mechanism (6) is installed on the inside of the vibration mechanism (5). The pipe is supported and fixed by the inner support mechanism (6) extending outward. The vibration mechanism (5) can make the pipe vibrate while rotating, shaking off the dirt on the inner wall of the pipe. The adjusting mechanism (2) includes a support plate (21) fixedly connected to the bottom of the hanger (1). Slide seats (22) are slidably connected to both sides of the support plate (21), and the outer side of the slide seats (22) is installed with the inner side of the telescopic frame (3). A first motor (23) is installed at the center of the lower surface of the support plate (21). A traction rod (24) is installed at the output end of the first motor (23). Both ends of the traction rod (24) are connected to one end of the first connecting rod (25) by a pin. The other end of the first connecting rod (25) is connected to the middle of the upper surface of the slide seat (22) by a pin. The traction rod (24) is driven to rotate clockwise or counterclockwise by the first motor (23), so that the first connecting rod (25) pulls the two slide seats (22) to move inward or outward at the same time. The vibration mechanism (5) includes a box (51) installed at the bottom of the rod (4). A rotating shaft (52) is installed at the bottom of the inner cavity of the box (51) via a bearing. A driven gear (53) is keyed to the outer wall of the rotating shaft (52). A second motor (54) is installed at the top of the left side wall of the box (51). A driving gear (55) and a swing assembly (56) are installed from left to right at the output end of the second motor (54). The driving gear (55) and the driven gear (53) are meshed and connected, and the transmission ratio is greater than 10, so that the rotating shaft (52) and the swing assembly (56) generate a speed difference. The centrifugal force generated when the swing assembly (56) rotates causes the box (51) to vibrate, thereby causing the pipe to vibrate and rotate at the same time. A cleaning assembly (57) is installed at the bottom of the inner side of the box (51). The swing assembly (56) includes a centrifugal rod (561) installed at the output end of the second motor (54). The right side wall of the centrifugal rod (561) is provided with several equidistant locking holes (562) from top to bottom. The inner cavity of the locking hole (562) is fitted with a positioning unit. The right end of the positioning unit is fitted with a centrifugal weight (567). The rotation diameter of the centrifugal weight (567) is adjusted by cooperating with the positioning unit through the locking hole (562), thereby changing the centrifugal force generated when the centrifugal weight (567) rotates under the condition that the speed of the second motor (54) remains unchanged, and controlling the vibration intensity of the box (51). The cleaning component (57) includes a rotary cylinder (571) installed at the bottom of the left side wall of the housing (51). A nozzle (572) is installed at the output end of the rotary cylinder (571). The nozzle (572) is connected to an air pump through an air pipe. The rotary cylinder (571) drives the nozzle (572) to rotate, and the nozzle (572) changes the direction of air jet to blow away impurities on the inner wall of the pipe.

2. The automatic gripping and lifting device for a crane according to claim 1, characterized in that, The positioning unit includes a rod (563) inserted into the inner cavity of the card hole (562). The right end of the rod (563) is installed with a centrifugal weight (567). The outer wall of the rod (563) is equidistantly embedded with balls (564) along the circumferential direction. The inner cavity of the rod (563) is respectively inserted with a pressing block (565) and a spring (566) from left to right. Under the elastic force of the spring (566), the pressing block (565) is pushed to the left, so that the pressing block (565) can press the balls (564).

3. The automatic gripping and lifting device for a crane according to claim 2, characterized in that, The extrusion block (565) has a conical shape on the left side.

4. The automatic gripping and lifting device for a crane according to claim 3, characterized in that, The internal support mechanism (6) includes several support rods (61) equidistantly installed at the end of the rotating shaft (52) along the circumferential direction. A hydraulic cylinder (62) is also installed at the center of the end of the rotating shaft (52). A slider (63) capable of lateral sliding is sleeved on the outer wall of the support rod (61), and the slider (63) is installed at the output end of the hydraulic cylinder (62). The hydraulic cylinder (62) drives the slider (63) to slide left and right along the outer wall of the support rod (61). A center rod (64) is installed at the end of the support rod (61) away from the rotating shaft (52). The outer wall of the center rod (64) is circumferentially connected to one end of several second connecting rods (65) by a pin. 5) The other end is connected to an inner support plate (66) by a pin. The outer side of the inner support plate (66) has anti-slip ridges to increase the friction when the inner support plate (66) supports the inner wall of the tube. A guide plate (67) is installed horizontally on the left side of the inner support plate (66), and the guide plate (67) is hollow. The outer wall of the slider (63) is connected to one end of the third link (68) by a pin along the circumferential direction. The intersection of the third link (68) and the second link (65) is connected by a pin. The other end of the third link (68) is equipped with a pin (69) inserted into the inner cavity of the guide plate (67). The pin (69) slides in the guide plate (67) to provide space for the rotation of the third link (68).

5. The automatic gripping and lifting device for a crane according to claim 4, characterized in that, The axis of the rotating shaft (52) and the axis of the central rod (64) are on the same straight line.

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