Hoisting equipment and hoisting method

Abstract

The invention discloses hoisting equipment and a hoisting method.The hoisting equipment comprises a beam frame, two hoisting devices arranged side by side, a locking shaft and an opening and closing mechanism, the opening and closing mechanism can drive the two hoisting devices to move in the first direction so as to adjust the distance between the two hoisting devices, and each hoisting device can hoist a workpiece; the hoisting equipment can synchronously hoist the two workpieces, and the two workpieces do not interfere with each other; the two folded lifting devices can be locked through the locking shaft, and then the two lifting devices are driven to rotate around the locking shaft through the opening and closing mechanism, so that the adjacent clamping pieces at the end parts of the lifting frame are close to each other to clamp and lift a single workpiece so as to adapt to workpieces with larger pipe diameters and weights; and the two clamping pieces are close to each other, so that a large-size workpiece can be stressed in a balanced manner in the clamping process.

Description

Technical Field

[0001] The present application relates to the field of hoisting, and in particular to a hoisting device and a hoisting method. Background Art

[0002] In some water supply and drainage and energy and chemical industries, many materials need to be transported through long-distance pipelines. Long-distance pipelines should be treated with anti-corrosion in advance. The lifting of long-distance pipelines cannot damage their anti-corrosion and insulation layers, and special lifting equipment is required for lifting. Special lifting hooks lift the steel pipe from both ends of the steel pipe without damaging the anti-corrosion and insulation layers of the steel pipe. When it is necessary to lift steel pipes of different lengths and specifications, the length of the lifting equipment is generally adjusted manually to adapt to different pipe lengths. This type of lifting equipment is a purely manual lifting equipment and cannot automatically adapt to pipe fittings of different diameters. Summary of the invention

[0003] The present application proposes a lifting device and a lifting equipment, which are intended to solve the problem that the lifting device cannot be automatically adjusted to adapt to pipes with different diameters.

[0004] The present application proposes a lifting device, comprising:

[0005] beam frame;

[0006] Two hanging devices are arranged side by side below the beam frame along the first direction, the hanging devices include a hanging frame and clamping members arranged at both ends of the hanging frame, and the length direction of the hanging frame is the second direction;

[0007] A central locking mechanism, comprising a locking shaft for locking the two hoisting devices that are closed together, wherein the locking shaft is located between the two hoisting devices and is arranged along the second direction; the two hoisting devices can rotate around the locking shaft in a locked state;

[0008] The opening and closing mechanism is arranged on the beam frame and is drivingly connected to the lifting device, and is used to drive the two lifting devices to move closer or farther away in the unlocked state, and to drive the lifting device to rotate around the locking axis in the locked state to bring the two adjacent clamping members closer together.

[0009] In some embodiments, the opening and closing mechanism includes two driving ends arranged along the first direction, the two driving ends are connected to the two hangers in a one-to-one correspondence, and the driving directions of the two driving ends are facing toward or away from each other.

[0010] In some embodiments, the beam frame is hinged to the hanger, or connected by a connecting rod, or suspended by a cable chain.

[0011] In some embodiments, the opening and closing mechanism comprises:

[0012] A screw rod is arranged on the beam frame and parallel to the second direction, wherein the screw rod comprises two sections connected to each other, and the threads on the two sections have opposite rotation directions;

[0013] Two nuts, arranged one-to-one corresponding to the two sections, the nuts are also slidably connected to the beam frame, and the nuts constitute the driving end;

[0014] The opening and closing driving member is arranged on the beam frame and is drivingly connected to the screw rod.

[0015] In some embodiments, the central locking mechanism further comprises:

[0016] Two locking seats are arranged in one-to-one correspondence with the two hangers, the locking seats are provided with locking holes, and the locking shaft is used to dock with the two locking seats;

[0017] A locking drive member is disposed on the hanger and is used to drive the locking shaft to move in and out of the locking seat.

[0018] In some embodiments, the lifting device also includes: a telescopic mechanism, including moving parts arranged at both ends of the hanger, and a first driving component for driving the two moving parts to move closer or farther away along the second direction, and the clamping parts are arranged on the two moving parts in a one-to-one correspondence.

[0019] In some embodiments, the hanger is hollow, the movable member is disposed inside the hanger, and the first driving assembly includes two transmission wheels rotatably disposed on the hanger, a chain connecting the two transmission wheels, and a first motor driving one of the transmission wheels to rotate; the two transmission wheels are arranged along the second direction, and the chain is connected to the movable member.

[0020] In some embodiments, the lifting device further comprises a clamping mechanism, and the clamping mechanism comprises:

[0021] Two fourth connecting rods are arranged at intervals along the third direction, one end of each fourth connecting rod is hinged to the moving member; the clamping member is respectively hinged to the other ends of the two fourth connecting rods, and together with the fourth connecting rod hooks, forms a four-bar linkage;

[0022] A limiting assembly, provided on the hanger, for limiting the swing angle of the fourth connecting rod;

[0023] An elastic member connects the clamping member and the moving member and is used to position the clamping member close to the moving member.

[0024] The present application also proposes a hoisting method, which is applied to the above-mentioned hoisting equipment, comprising the following steps:

[0025] The two lifting devices are driven to move toward each other along the first direction, and the two lifting devices are locked by the locking shaft; the two lifting devices are driven away from each other at one end close to the beam frame, so that the two lifting devices rotate around the locking shaft, and the two adjacent clamping members are brought closer.

[0026] The present application also proposes a hoisting method, which is applied to the above-mentioned hoisting equipment, comprising the following steps:

[0027] Driving the telescopic mechanism to extend and retract to adjust the spacing of the clamping members in the second direction;

[0028] Driving the two hoisting devices to move and adjusting the spacing between the hoisting devices in the first direction;

[0029] The lifting device is driven to clamp the two ends of the workpiece, so that the two workpieces are clamped synchronously;

[0030] Alternatively, two adjacent clamping members are brought closer together to clamp a single workpiece.

[0031] In the lifting equipment and lifting method proposed in the present application, the lifting equipment includes a beam frame, two lifting devices arranged side by side, a locking shaft and an opening and closing mechanism, wherein the opening and closing mechanism can drive the two lifting devices to move along a first direction to adjust the distance between the two, so that each lifting device can lift a workpiece, and the lifting equipment can lift the two workpieces synchronously without interfering with each other; the two closed lifting devices can also be locked by the locking shaft, and then the two lifting devices can be driven to rotate around the locking shaft by the opening and closing mechanism, so that the adjacent clamping parts at the ends of the hanger are brought together, and a single workpiece is clamped and lifted to adapt to workpieces with larger diameters and weights. The two clamping parts are brought together to ensure that large-sized workpieces are evenly stressed during the clamping process.

[0032] This application can realize the automation of steel pipe hoisting, and can also perform adaptive hoisting of pipes of different lengths and specifications. The hoist can automatically switch between single-tube hoist and double-tube hoist. For large-tonnage steel pipes, the single-tube hoist mode is used, and for small-tonnage pipes, the double-tube hoist mode is used. It can not only utilize the maximum hoisting capacity range of the hoist, but also improve the efficiency of the hoist. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 This is a structural schematic diagram of a hoisting device in one embodiment of the present application;

[0034] Figure 2 for Figure 1 A schematic structural diagram of a hoisting device in an embodiment;

[0035] Figure 3 for Figure 2 A cross-sectional view of a lifting device in an embodiment;

[0036] Figure 4 for Figure 2 A schematic structural diagram of the lifting device from another perspective in the embodiment;

[0037] Figure 5 This is a schematic diagram of the structure of the lifting device in a separated state in one embodiment of the present application;

[0038] Figure 6 It is a schematic diagram of the structure of the lifting device in a closed state in one embodiment of the present application.

[0039] The purpose, features and advantages of this application will be further described in conjunction with the embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0040] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the scheme in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments in the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0041] It should be noted that all directional indications such as up, down, left, right, front, back... in the embodiments of the present application are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture as shown in the accompanying drawings. If the specific posture changes, the directional indication will also change accordingly.

[0042] It should also be noted that when an element is referred to as being "fixed on" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element at the same time. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or there may be an intermediate element at the same time.

[0043] In addition, the descriptions of "first", "second", etc. in this application are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in this field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0044] This application proposes a lifting device, referring to Figures 1 to 4The lifting equipment includes: a beam frame 10; two lifting devices, which are arranged side by side below the beam frame 10 along a first direction, and the lifting devices include a hanger 31 and clamps 42 arranged at both ends of the hanger 31, and the length direction of the hanger 31 is the second direction; a central locking mechanism, including a locking shaft 62 for locking the two lifting devices together, and the locking shaft 62 is located between the two lifting devices and is arranged along the second direction; the two lifting devices can rotate around the locking shaft 62 in the locked state; an opening and closing mechanism 20, which is arranged on the beam frame 10 and is drivingly connected to the lifting device, and is used to drive the two lifting devices to move closer or farther in the non-locked state, and drive the lifting device to rotate around the locking shaft 62 in the locked state to bring the two adjacent clamps 42 closer.

[0045] In this embodiment, the opening and closing mechanism can drive the two lifting devices to move along the first direction to adjust the distance between them, so that each lifting device can lift one workpiece, and the two workpieces do not interfere with each other, and the lifting equipment can lift the two workpieces synchronously; the two lifting devices that are closed can also be locked by the locking shaft 62, and then the two lifting devices are driven to rotate around the locking shaft 62 by the opening and closing mechanism, so that the clamping members 42 adjacent to the ends of the hanger 31 are brought together, and a single workpiece is clamped and lifted; the two clamping members 42 are brought together to adapt to workpieces with larger diameters and weights. The four clamping members 42 clamp a single workpiece at four points, and there may be a situation where one or two clamping points are virtual clamped and not stressed. After the two clamping members are brought together, the clamping members 42 can clamp the workpiece at two points to ensure that large-sized workpieces are evenly stressed during the clamping process. It is worth noting that the above-mentioned clamping members 42 can clamp the workpiece along the second direction and clamp the workpiece by friction; it can also hook the inner wall of the pipe through a specific hook-like structure. The above-mentioned virtual clamping without force can also be understood as the inner wall of the pipe fitting cannot be hooked by the clamping member 42.

[0046] This application can realize the automation of steel pipe hoisting, and can also perform adaptive hoisting of pipes of different lengths and specifications. The hoist can automatically switch between single-tube hoist and double-tube hoist. For large-tonnage steel pipes, the single-tube hoist mode is used, and for small-tonnage pipes, the double-tube hoist mode is used. It can not only utilize the maximum hoisting capacity range of the hoist, but also improve the efficiency of the hoist.

[0047] In some embodiments, the opening and closing mechanism 20 includes two driving ends arranged along the first direction, the two driving ends are connected to the two hangers in a one-to-one correspondence, and the driving directions of the two driving ends are facing each other or facing away from each other. In this embodiment, the hanger 31 is suspended at the lower part of the beam frame 10. The opening and closing mechanism 20 can be optionally provided with a screw transmission assembly on the beam frame 10, and the screw transmission assembly specifically includes a screw 21 arranged along the first direction, and nuts 22 arranged at both ends of the screw 21, the screw 21 includes two connected sections, and the thread rotation directions of the two sections are opposite, and the nuts 22 are slidably connected to the beam frame 10, and when the screw 21 rotates, the nuts 22 can approach or move away from each other. The opening and closing mechanism 20 also includes a second motor 23 arranged on the beam frame 10, and the second motor 23 is used to drive the screw 21 to rotate. The two nuts 22 on the same screw 21 constitute two driving ends.

[0048] A set of opening and closing mechanisms 20 are respectively provided at both ends of the beam frame 10 along the second direction. At the same end of the two lifting devices, the hanger 31 of one lifting device is connected to a nut 22 of one set of opening and closing mechanisms 20, and the hanger 31 of the other lifting device is connected to another nut 22 of the opening and closing mechanism 20. At the same other end of the two lifting devices, the hanger 31 of one lifting device is connected to a nut 22 of the other set of opening and closing mechanisms 20, and the hanger 31 of the other lifting device is connected to another nut 22 of the other opening and closing mechanism 20. When the two sets of opening and closing mechanisms 20 are started at the same time, the two lifting devices can be driven to move closer or farther along the first direction. Figure 5 As shown in the figure, two lifting devices can be set up to lift two workpieces at the same time. Figure 6 As shown, of course, the two lifting devices can also be put together to lift the same workpiece at the same time, especially for workpieces with larger tonnage.

[0049] In this embodiment, the beam frame 10 and the hanger 31 can be hinged, or connected by a connecting rod, or suspended by a cable chain.

[0050] In some embodiments, reference Figures 1 to 6The hoisting device further comprises a locking shaft 62, which is used to lock the two hoisting devices that are closed; when the two hoisting devices are in a locked state, the two adjacent clamping members 42 can rotate around a rotation center, the rotation center is located between the two hangers 31, and the rotation center is also parallel to the second direction. In this embodiment, locking seats 61 are respectively provided on the two opposite hangers 31, and the locking seats 61 are provided on the sides of the two hangers 31 that are close to each other, and the two locking seats 61 are provided with locking seats extending along the second direction. When the two hoisting devices are closed, the two locking seats 61 are butted, and the locking holes of the two are coaxial. The locking shaft 62 can be arranged along the second direction. And driven by a locking drive 63, the locking drive can be a cylinder or an electric cylinder, and the locking shaft 62 can move along the second direction to be inserted into the locking hole of the locking seat 61, thereby locking the two hangers 31. Ensure that the two hoisting devices can rotate around the locking shaft 62.

[0051] In some embodiments, reference Figures 1 to 6 The lifting device includes: a telescopic mechanism 30, which includes moving parts 32 arranged at both ends of the hanger 31, the moving parts 32 are arranged along the second direction, and a first driving component for driving the two moving parts 32 to move closer or farther away along the second direction; the clamping members 42 are arranged on the two moving parts in a one-to-one correspondence.

[0052] In the present embodiment, the two moving members 32 are slidably connected with the hanger 31 and arranged along the second direction. The sliding direction of the moving members 32 is along the second direction, and the ends of the two moving members 32 that are away from each other constitute the moving members. Specifically, the hanger 31 can be set as a square tube, and the moving members 32 can also be selected as a square tube, and the length direction of the square tube is the above-mentioned second direction. The two moving members 32 are inserted from the two ends of the hanger 31 respectively, and the moving members 32 are slidably connected with the hanger 31 through a slide rail and a slider. The slide rail can be set on the inner top wall and the inner bottom wall in the hanger 31, and the slider is set on the upper side wall and the lower side wall of the moving members 32. The free ends of the two moving members 32 outside the hanger 31 constitute the above-mentioned moving members. The moving members 32 can extend outward from the hanger 31 at the same time, and can also be inserted inward, so that the overall length of the telescopic mechanism 30 can be adjusted to adapt to workpieces of different lengths.

[0053] In some embodiments, reference Figures 1 to 4 The hanger 31 is hollow, the moving member 32 is arranged in the hanger 31, and the first driving assembly includes two transmission wheels 33 rotatably arranged on the hanger 31, a chain 34 connecting the two transmission wheels 33, and a first motor 35 driving one of the transmission wheels 33 to rotate; the two transmission wheels 33 are arranged along the second direction, and the chain 34 is connected to the moving member 32.

[0054] In the present embodiment, the transmission wheel 33 and the chain 34 are arranged in the hanger 31, and are positioned in the gap between the hanger 31 and the front and rear sides of the moving member 32. One group of first drive assembly can be set to drive two moving members 32 to move simultaneously. That is, one of the transmission wheels 33 is arranged near one end of the hanger 31, and another transmission wheel 33 is arranged near the other end of the hanger 31, and the two transmission wheels 33 are arranged at the hanger 31 inner wall and are connected with the hanger 31 rotation. The chain 34 connects the two transmission wheels 33 and is wound around the two transmission wheels 33. The chain 34 comprises two sections, one above and one below, and the section located at the top is connected with one of the moving members 32, and the section below is connected with another moving member 32. The first motor 35 can be located at the front side or the rear side of the hanger 31, and is used to drive one of the transmission wheels 33 to rotate, so that the upper and lower drive ends of the chain 34 can be driven to move, thereby driving the two moving members 32 to move toward or away from each other. Of course, two groups of first drive assemblies can also be adopted to drive the two moving members 32 to open and close respectively. One group of transmission wheels 33 is respectively arranged at the end and the middle of the hanger 31, and the other group of transmission wheels 33 is arranged at the other end and the middle of the hanger 31. Two first motors 35 are arranged side by side in the middle of the hanger 31, wherein one first motor 35 drives a transmission wheel 33 in the middle to rotate, and the other first motor 35 drives another transmission wheel 33 in the middle to rotate. The two groups of first drive assemblies can use the first motor 35 with smaller torque to disperse the load of the first motor 35. The two moving parts 32 move away from each other to open the two relative clamping parts 42, and move towards each other to bring the two clamping parts 42 closer to clamp the workpiece. Of course, the above-mentioned first drive assembly can also be realized by a directional screw drive, similar to the above-mentioned opening and closing mechanism, and the telescopic mechanism also has a self-locking function of movement.

[0055] In some embodiments, reference Figures 1 to 4The clamp mechanism 40 includes: two fourth connecting rods 41, which are arranged at intervals along the third direction, and one end of the fourth connecting rod 41 is hinged to the moving part; the clamping member 42 is respectively hinged to the other ends of the two fourth connecting rods 41, and hooked with the fourth connecting rod 41 to form a four-bar mechanism. The limiting assembly is arranged on the hanger 31, and is used to limit the swing angle of the fourth connecting rod 41; the elastic member 45 connects the clamping member 42 and the moving part 32, and is used to make the clamping member 42 close to the moving part. In this embodiment, a mounting seat 311 is provided at the end of the hanger 31, wherein a fourth connecting rod 41 is hinged to the mounting seat 311, and the fourth connecting rod 41 can swing in the mounting seat 311. The limiting assembly includes an arc hole arranged in the mounting seat 311 and a protrusion 411 arranged on the fourth connecting rod 41, and the protrusion 411 can slide in the arc hole with the swing of the fourth connecting rod 41, and the curvature of the arc hole limits the swing angle of the fourth connecting rod 41. One end of the elastic member 45 is connected to the clamping member 42, and the other end is connected to the mounting seat 311. The tension of the elastic member 45 keeps the clamping members 42 at both ends of the telescopic mechanism 30 close to each other, ensuring that the clamping members 42 can support the workpiece. At the same time, the limit assembly also allows the clamping member 42 to have a certain swing space to avoid mechanical damage when clamping the end of the pipe.

[0056] In some embodiments, reference Figures 1 to 6 The opening and closing mechanism 20 is also used to drive the upper ends of the two lifting mechanisms away from each other, so that the free ends of the two adjacent clamping members 42 on the two lifting devices in the locked state are close to each other. In this embodiment, there is a certain distance between the two hangers 31 in the locked state. The hanger 31 and the nut 22 of the opening and closing mechanism 20 can be hinged, or flexibly connected by a connecting arm or a rope, so that the upper end of the lifting device can have a certain swing space. Due to the existence of the above-mentioned distance, the two adjacent clamping members 42 will also have a certain distance. The lower end of the clamping member 42 is generally extended along the clamping direction with a hook-shaped portion 43 to hook the inner wall of the pipe. The clamping member 42 and the hook-shaped portion 43 constitute a hook structure.

[0057] Four clamping members 42 clamp the ends of the pipe, such as Figure 5 As shown, the four-point positioning may result in an unbalanced force state, where only one hook-shaped portion 43 at one end of the pipe is stressed, where the stress is more concentrated, and the other hook-shaped portion 43 is in a vacant position, which may cause mechanical damage. Figure 6As shown, the upper ends of the two lifting devices are driven apart by the opening and closing mechanism 20, and the adjacent clamping members 42 at their lower ends will be brought together accordingly. The side walls of the two adjacent clamping members 42 that are close to each other can be set as inclined surfaces so that the above-mentioned side walls are completely fitted together when they are brought together. At this time, the four-point clamping becomes a two-point centering clamping, ensuring that the two ends of the pipe are balanced when clamping and lifting. Pins 44 and positioning holes can also be set on the side surfaces of the two adjacent clamping members 42 that are close to each other, which play a certain guiding, fitting and limiting effect when the two are fitted together, and prevent the clamping members 42 from being separated by external forces. Through the cooperation of the opening and closing mechanism 20 and the locking shaft 62, the distance adjustment and merging of the two sets of lifting devices can be realized, ensuring that the two adjacent clamping members 42 are merged into one.

[0058] The present application also proposes a lifting method, which is applied to the above-mentioned lifting device, including the following steps: driving the two lifting devices to move closer to each other along a first direction, and locking the two lifting devices by a locking shaft 62; driving the two lifting devices close to one end of the beam frame 10 away from each other, so that the two lifting devices rotate around the locking shaft, and the free ends of the two adjacent clamps are close to each other.

[0059] In the operation steps of the hoisting method, a locking seat 61 is respectively provided on the two relative hoisting devices, and a locking seat extending along the second direction is provided on the locking seat 61. When the two hoisting devices are closed, the two locking seats 61 are butted, and the two locking seats are coaxial. The locking shaft 62 is arranged along the second direction. It is driven by a cylinder or an electric cylinder, and moves along the second direction to be inserted into the locking seat, thereby locking the two hangers 31. Relative movement is avoided when hoisting the workpiece.

[0060] In the locked state, there is still a certain distance between the two lifting devices, and the upper end of the lifting device has a certain swing space. Due to the existence of the above-mentioned distance, the two adjacent clamping members 42 will also have a certain distance. The upper ends of the two lifting devices are driven apart by the opening and closing mechanism 20, and the adjacent clamping members 42 at their lower ends will be brought together accordingly. The side walls of the two adjacent clamping members 42 that are close to each other can be set as inclined surfaces so that the above-mentioned side walls are completely fitted when they are close together. At this time, the four-point clamping becomes a two-point centering clamping, ensuring that the two ends of the pipe are balanced during clamping and lifting. Pins and positioning holes can also be set on the sides of the two adjacent clamping members 42 that are close to each other, which play a certain guiding, fitting and limiting effect when the two are fitted together, and prevent the clamping members 42 from being separated due to external forces.

[0061] The present application also proposes a lifting method, which is applied to the above-mentioned lifting device, including the following steps: driving the telescopic mechanism 30 to extend and retract to adjust the spacing of the clamping members 42 in the second direction; driving the two lifting devices to move to adjust the spacing of the lifting devices in the first direction; driving the clamping members 42 to move to clamp the two ends of the workpiece to clamp one or two workpieces. In the operation steps of this lifting method, the spacing between the two moving members 32 of the telescopic mechanism 30 is adjustable, which can be applied to workpieces of different lengths. By driving the lifting device to clamp the two ends of the workpiece, two workpieces can be clamped synchronously; or, two adjacent clamping members 42 are brought close together to clamp a single workpiece. In this step, a single workpiece is clamped, that is, the four-point clamping is converted into a two-point centering clamping in the previous lifting method.

[0062] This application can realize the automation of steel pipe hoisting, and can also perform adaptive hoisting of pipes of different lengths and specifications. The hoist can automatically switch between single-tube hoist and double-tube hoist. For large-tonnage steel pipes, the single-tube hoist mode is used, and for small-tonnage pipes, the double-tube hoist mode is used. It can not only utilize the maximum hoisting capacity range of the hoist, but also improve the efficiency of the hoist.

[0063] The automatic switching implementation process between single-tube mode and dual-tube mode is as follows:

[0064] The lifting equipment in the embodiment of the present application can automatically switch between single-tube lifting equipment and double-tube lifting equipment. The single-tube lifting equipment mode is used for large-tonnage steel pipes to maximize the lifting capacity of the lifting equipment; when lifting small-tonnage steel pipes, the double-tube lifting equipment mode is used to improve the efficiency of the lifting equipment.

[0065] The double-tube mode is switched to the single-tube mode. The specific process is as follows:

[0066] The opening and closing mechanism of the hoisting equipment drives the two hoisting devices to move closer. After the hoisting devices move closer, the locking holes on the left and right hoisting devices are aligned. At this time, the electric push rod pushes the locking shaft and inserts the locking shaft into the locking hole of the hoisting device. The two hoisting devices are connected and merged into one.

[0067] However, the hook positions of the two lifting devices are far apart at this time, and it is not possible to lift a single steel pipe. After the lifting devices are merged, the opening and closing mechanism drives the upper end of the lifting device to deviate to both sides. When the lifting devices deviate to both sides, the two lifting devices rotate around the locking axis so that the hooks of the lifting devices are merged together. When the hook position detects that the two hooks are merged, the opening and closing mechanism stops moving. Thereby, the lifting equipment changes from double-tube mode to single-tube mode. In single-tube mode, steel pipes with the maximum load capacity of the lifting equipment can be lifted. The single-tube mode is switched to double-tube mode, and its operation process is the reverse process of the above process.

[0068] The above are only partial or preferred embodiments of the present application. Neither the text nor the drawings can limit the scope of protection of the present application. All equivalent structural changes made using the contents of the present application specification and drawings under the overall concept of the present application, or direct / indirect application in other related technical fields are included in the scope of protection of the present application.

Claims

1. A lifting device, characterized in that: include: beam frame; Two hanging devices are arranged side by side below the beam frame along the first direction, the hanging devices include a hanging frame and clamping members arranged at both ends of the hanging frame, and the length direction of the hanging frame is the second direction; A central locking mechanism, comprising a locking shaft for locking the two hoisting devices that are closed together, wherein the locking shaft is located between the two hoisting devices and is arranged along the second direction; the two hoisting devices can rotate around the locking shaft in a locked state; The opening and closing mechanism is arranged on the beam frame and is drivingly connected to the lifting device, and is used to drive the two lifting devices to move closer or farther away in the unlocked state, and to drive the lifting device to rotate around the locking axis in the locked state to bring the two adjacent clamping members closer together.

2. The hoisting equipment according to claim 1, characterized in that: The opening and closing mechanism comprises two driving ends arranged along the first direction, the two driving ends are connected to the two hangers in a one-to-one correspondence, and the driving directions of the two driving ends are facing towards or away from each other.

3. The hoisting equipment according to claim 2, characterized in that: The beam frame is hinged to the hanger, or connected by a connecting rod, or suspended by a cable chain.

4. The hoisting equipment according to claim 3, characterized in that: The opening and closing mechanism comprises: A screw rod is arranged on the beam frame and parallel to the second direction, wherein the screw rod comprises two sections connected to each other, and the threads on the two sections have opposite rotation directions; Two nuts, arranged one-to-one corresponding to the two sections, the nuts are also slidably connected to the beam frame, and the nuts constitute the driving end; The opening and closing driving member is arranged on the beam frame and is drivingly connected to the screw rod.

5. The hoisting equipment according to claim 1, characterized in that: The central locking mechanism also includes: Two locking seats are arranged in one-to-one correspondence with the two hangers, the locking seats are provided with locking holes, and the locking shaft is used to dock with the two locking seats; A locking drive member is disposed on the hanger and is used to drive the locking shaft to move in and out of the locking seat.

6. The hoisting equipment according to any one of claims 1 to 5, characterized in that: The hoisting device further comprises: a telescopic mechanism, comprising moving parts arranged at both ends of the hanger, and a first driving assembly for driving the two moving parts to move closer or farther away along the second direction, and the clamping parts are arranged on the two moving parts in a one-to-one correspondence.

7. The hoisting equipment according to claim 6, characterized in that: The hanger is hollow, the movable member is arranged inside the hanger, and the first driving assembly includes two transmission wheels rotatably arranged on the hanger, a chain connecting the two transmission wheels, and a first motor driving one of the transmission wheels to rotate; the two transmission wheels are arranged along the second direction, and the chain is connected to the movable member.

8. The hoisting equipment according to claim 7, characterized in that: The lifting device also includes a clamping mechanism, and the clamping mechanism includes: Two fourth connecting rods are arranged at intervals along the third direction, one end of each fourth connecting rod is hinged to the moving member; the clamping member is respectively hinged to the other ends of the two fourth connecting rods, and together with the fourth connecting rod hooks, forms a four-bar linkage; A limiting assembly, provided on the hanger, for limiting the swing angle of the fourth connecting rod; An elastic member connects the clamping member and the moving member and is used to position the clamping member close to the moving member.

9. A hoisting method, characterized in that: The lifting device used in any one of claims 1 to 8 comprises the following steps: The two lifting devices are driven to move toward each other along the first direction, and the two lifting devices are locked by the locking shaft; the two lifting devices are driven away from each other at one end close to the beam frame, so that the two lifting devices rotate around the locking shaft, and the two adjacent clamping members are brought closer.

10. A hoisting method, characterized in that: The hoisting equipment used in any one of claims 6 to 8 comprises the following steps: Driving the telescopic mechanism to extend and retract to adjust the spacing of the clamping members in the second direction; Driving the two hoisting devices to move and adjusting the spacing between the hoisting devices in the first direction; The lifting device is driven to clamp the two ends of the workpiece so as to clamp the two workpieces synchronously; or, two adjacent clamping members are brought close together to clamp a single workpiece.

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