Hydraulic lifting equipment

Abstract

The present application provides a kind of hydraulic lifting equipment for driving traction body to ascend or descend, comprising first hydraulic cylinder, first support rod, second support rod, support plate, guide plate, upper anchor locking mechanism and lower anchor locking mechanism, upper anchor locking mechanism is connected with first hydraulic cylinder, and is used to be driven under the drive of first hydraulic cylinder and move along vertical direction with the clamping and driving of traction body, the lower anchor locking mechanism is connected with support plate, and is used to clamp and fix traction body, the upper anchor locking mechanism and the lower anchor locking mechanism are selectively connected with traction body, and when one of upper anchor locking mechanism and lower anchor locking mechanism is connected with traction body, the other is connected with traction body or not connected with traction body.The hydraulic lifting equipment of the present application can automatically pull back traction body after load is lifted to position, without the aid of external equipment, so that the traction body can be conveniently lifted again, thereby filling the blank in the field of automatic return technology of empty traction body in hydraulic lifting equipment.

Description

Technical Field

[0001] The present invention relates to the technical field of special equipment hoisting, in particular to a hydraulic lifting device. Background Art

[0002] In the field of hydraulic lifting, frequent high-altitude lifting operations, such as the layered lifting of multi-story truss structures or the segmented lifting of bridge decks, often require hydraulic lifting equipment using steel strands as rigging to repeatedly lift the load at a specific location or within a specific area. After a single-layer truss or segmented bridge deck is hoisted into place and the lifting equipment is removed, the one-way self-locking nature of the hydraulic lifting equipment's anchors prevents the lifted steel strands from being lowered, thus preventing the hydraulic lifting equipment from being used again.

[0003] At present, the steel strands of hydraulic lifting equipment can be pulled back by using two hoists and clamps to lift them alternately in the air so that the weight of the rear end steel strand is transferred to the hoist, and then the upper anchor locking mechanism and the lower anchor locking mechanism are opened to allow the steel strand to pass through the hydraulic lifting equipment and slowly descend. In addition, the steel strand can also be clamped at its output end by a large crane. When the crane lifts the tail end steel strand to a vertical position, the upper and lower anchor locking mechanisms are opened, and the crane slowly descends, driving the steel strand to gradually move downward. During this process, the steel strand may fall due to the loose clamping of the large crane, which makes the lowering process of the steel strand a major safety hazard. At the same time, due to the long tail end steel strand, a large-tonnage crane with a higher lifting height is required to lower the steel strand at one time, which increases the total cost of structural installation and reduces the working efficiency of the hydraulic lifting equipment. In addition, in order to lower the steel strands, it is sometimes necessary to remove the lifted steel strands in the hydraulic lifting equipment and reinstall them, which consumes a lot of manpower, material and financial resources, and also reduces the working efficiency of the hydraulic lifting equipment, making it less economical. Summary of the Invention

[0004] The object of the present invention is to provide a hydraulic lifting device to solve the problem that the existing hydraulic lifting device cannot automatically lower the steel strand after being lifted into place.

[0005] To achieve at least one of the above-mentioned purposes, the present invention provides a hydraulic lifting device for driving a traction body to rise or fall, comprising a first hydraulic cylinder, a first support rod, a second support rod, a support plate, a guide plate, an upper anchor locking mechanism, and a lower anchor locking mechanism, wherein the first support rod is connected to the first hydraulic cylinder and is used to support the first hydraulic cylinder, and the upper anchor locking mechanism and the lower anchor locking mechanism are respectively arranged above and below the first hydraulic cylinder;

[0006] The upper anchor locking mechanism is connected to the first hydraulic cylinder and is used to clamp and drive the traction body to move in the vertical direction under the drive of the first hydraulic cylinder; the first support rod, the support plate and the second support rod are connected in sequence in the vertical direction, the second support rod is arranged above the guide plate and connected to the guide plate, and the lower anchor locking mechanism is connected to the support plate and is used to clamp and fix the traction body; the upper anchor locking mechanism and the lower anchor locking mechanism are both selectively connected to the traction body, and when one of the upper anchor locking mechanism and the lower anchor locking mechanism is connected to the traction body, the other is connected to or not connected to the traction body.

[0007] Optionally, the upper anchor locking mechanism and the lower anchor locking mechanism both include a driving device, an anchor ring, a first anchor plate and a second anchor plate, the anchor ring of the upper anchor locking mechanism is connected to the piston rod of the first hydraulic cylinder, and the anchor ring of the lower anchor locking mechanism is connected to the support plate, and the driving device is respectively connected to the first anchor plate and the second anchor plate to drive the first anchor plate and the second anchor plate to move relative to the anchor ring; the first anchor plate and the second anchor plate are used to clamp the traction body or release the traction body under the drive of the driving device.

[0008] Optionally, the anchor ring is provided with a first limiting tapered hole and a second limiting tapered hole coaxially arranged vertically, the first limiting tapered hole cooperates with the first anchor sheet, and the second limiting tapered hole cooperates with the second anchor sheet;

[0009] When the driving device drives the first anchor plate to move in the second vertical direction, at least a portion of the structure of the first anchor plate enters the first limiting tapered hole; when the driving device drives the first anchor plate to move in the first vertical direction, at least a portion of the structure of the first anchor plate leaves the first limiting tapered hole.

[0010] When the driving device drives the second anchor plate to move along the first direction, at least a portion of the second anchor plate enters the second limiting tapered hole; when the driving device drives the second anchor plate to move along the second direction, at least a portion of the second anchor plate leaves the second limiting tapered hole.

[0011] Optionally, there are multiple traction bodies, and the number of the first limiting conical holes and the number of the second limiting conical holes are respectively multiple. The number of the first anchor sheets corresponds to the number of the first limiting member conical holes, and the number of the second anchor sheets corresponds to the number of the first limiting member conical holes. Each of the first anchor sheets can correspond to the position of a second anchor sheet, so that each of the first anchor sheets and the corresponding second anchor sheet can jointly clamp one of the traction bodies.

[0012] Optionally, the outer diameter of the first anchor sheet gradually increases from one end to the other end along the first direction, and the shape of the first limiting tapered hole matches the outer surface shape of the first anchor sheet; the outer diameter of the second anchor sheet gradually decreases from one end to the other end along the first direction, and the shape of the second limiting tapered hole matches the outer surface shape of the second anchor sheet.

[0013] Optionally, in the upper anchor locking mechanism, the height of the second anchor plate in the vertical direction is smaller than the height of the first anchor plate in the vertical direction.

[0014] Optionally, the upper anchor locking mechanism and the lower anchor locking mechanism also include a transmission device, which is respectively connected to the driving device, the first anchor plate and the second anchor plate, and the transmission device is used to drive the first anchor plate or the second anchor plate to move respectively under the drive of the driving device.

[0015] Optionally, the upper anchor locking mechanism and the lower anchor locking mechanism both further include a pushing device, and the transmission device includes a first pressure anchor plate and a second pressure anchor plate, the first pressure anchor plate being connected to the driving device and the first anchor plate, respectively, and being used to drive the first anchor plate to move under the drive of the driving device; the pushing device being connected to the driving device and the second pressure anchor plate, respectively, and being used to drive the second pressure anchor plate to move under the drive of the driving device; the second pressure anchor plate being connected to the second anchor plate, and being used to drive the second anchor plate to move under the drive of the pushing device.

[0016] Optionally, the driving device includes a second hydraulic cylinder, the piston rod of the second hydraulic cylinder is connected to the first pressure anchor plate; the pushing device includes a connecting plate and a push rod, the connecting plate is connected to the cylinder body of the second hydraulic cylinder, and the connecting plate is connected to the push rod; the push rod is connected to the second pressure anchor plate, and when the second hydraulic cylinder drives the connecting plate to move, it can prompt the push rod to drive the second pressure anchor plate to move.

[0017] Optionally, the upper anchor locking mechanism and the lower anchor locking mechanism also include a first spring device and a second spring device, the first spring device is connected to the first anchor plate and is used to apply a first compressing force in the second direction to the first anchor plate; the second spring device is connected to the second anchor plate and is used to apply a second compressing force in the first direction to the second anchor plate.

[0018] Optionally, the first spring device and the second spring device each include a screw, a screw spring seat, a spring, a spring pressure plate and a positioning device connected in sequence;

[0019] The screw of the first spring device is connected to the first anchor plate, and the screw spring seat of the first spring device is slidably connected to the first pressure anchor plate and is used to drive the first anchor plate to move under the drive of the first pressure anchor plate; one end of the positioning device of the first spring device is connected to the spring pressure plate, and the other end is connected to the first pressure anchor plate; the positioning device of the first spring device is used to limit the first pressing force of the first spring device on the first anchor plate;

[0020] The screw of the second spring device is connected to the second anchor plate; the screw spring seat of the second spring device is slidably connected to the second pressure anchor plate, and is used to drive the second anchor plate to move under the drive of the second pressure anchor plate; one end of the positioning device of the second spring device is connected to the spring pressure plate, and the other end is connected to the second pressure anchor plate; the positioning device of the second spring device is used to limit the second pressing force of the second spring device on the second anchor plate.

[0021] Optionally, the upper anchor locking mechanism and the lower anchor locking mechanism both further include a first limiting device and a second limiting device, the first limiting device including a first limiting member and a first stopper; the first stopper is sleeved on the first limiting member and is used to limit the minimum distance between the anchor ring and the first pressure anchor plate; the first limiting member is used to pass through the first stopper and then connect to the anchor ring;

[0022] The second limiting device includes a second limiting member and a second stop member, wherein the second stop member is sleeved on the second limiting member and is movably threadedly connected to the second limiting member; the second stop member is used to limit the position of the connecting plate; the second limiting member is used to pass through the second stop member and then connect to the anchor ring;

[0023] When the first anchor plate is required to clamp or release the traction body, and the second anchor plate releases the traction body, the second stop member abuts against the connecting plate to limit the position of the connecting plate, and the driving device drives the first pressure anchor plate to drive the first anchor plate to move to clamp or release the loaded traction body; when both the first anchor plate and the second anchor plate are required to clamp the traction body, the driving device drives the first pressure anchor plate to drive the first anchor plate to release the traction body, so that the second stop member moves toward the first direction; the driving device drives the first pressure anchor plate to move in the second direction until the first stop member abuts against the first pressure anchor plate, and the first anchor plate clamps the traction body; the driving device also drives the connecting plate to drive the push rod and the second pressure anchor plate to move in the first direction until the connecting plate abuts against the second stop, and the second anchor plate clamps the traction body.

[0024] Optionally, when the first pressure anchor plate moves to the limit position, the movement distance of the first pressure anchor plate when it moves in the second direction until it abuts against the first stopper is a first movement distance, and the movement distance of the connecting plate when it moves in the first direction until it abuts against the second stopper is a second movement distance;

[0025] The sum of the first moving distance and the second moving distance is smaller than the stroke of the second hydraulic cylinder.

[0026] In the hydraulic lifting equipment provided by the present invention, the hydraulic lifting equipment is used to drive the traction body to rise or fall, and it includes a first hydraulic cylinder, a first support rod, a second support rod, a support plate, a guide plate, an upper anchor locking mechanism and a lower anchor locking mechanism, the first support rod is connected to the first hydraulic cylinder and is used to support the first hydraulic cylinder, the upper anchor locking mechanism and the lower anchor locking mechanism are respectively arranged above and below the first hydraulic cylinder; the upper anchor locking mechanism is connected to the first hydraulic cylinder and is used to clamp under the drive of the first hydraulic cylinder and drives the traction body to move in the vertical direction; the first support rod, the support plate and the second support rod are connected in sequence in the vertical direction, the second support rod is arranged above the guide plate and connected to the guide plate, the lower anchor locking mechanism is connected to the support plate and is used to clamp and fix the traction body; the upper anchor locking mechanism and the lower anchor locking mechanism are both selectively connected to the traction body, and when one of the upper anchor locking mechanism and the lower anchor locking mechanism is connected to the traction body, the other is connected to or not connected to the traction body. The hydraulic lifting device provided in the present application can automatically pull back the traction body after the load is lifted into place through the hydraulic lifting device without the assistance of external equipment, so that it is convenient to lift the traction body again, and it can also significantly save the preparation time for lifting the traction body again, improve the efficiency of the hydraulic lifting device in lifting loads multiple times, eliminate safety hazards in the lifting preparation stage, and reduce the overall cost of load lifting, while ensuring the safety and reliability of the descent process of the unloaded traction body, filling the gap in the field of automatic return technology of the traction body in the hydraulic lifting device. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a structural diagram of a hydraulic lifting device in a preferred embodiment of the present invention;

[0028] Figure 2 It is a structural schematic diagram of a preferred embodiment of the present invention when the first anchor piece in the upper anchor locking mechanism and the lower anchor locking mechanism releases the traction body and the second anchor piece releases the traction body during the load lifting stage;

[0029] Figure 3Structure diagram of the first anchor piece of the upper anchor locking mechanism and the lower anchor locking mechanism clamping the traction body and the second anchor piece releasing the traction body in the load lifting stage of a preferred embodiment of the present application;

[0030] Figure 4 Structure diagram of the first anchor piece of the upper anchor locking mechanism and the lower anchor locking mechanism releasing the traction body and the second anchor piece releasing the traction body after the second stop piece moves to the first direction in the traction body return stage of a preferred embodiment of the present application;

[0031] Figure 5 Structure diagram of the first anchor piece of the upper anchor locking mechanism and the lower anchor locking mechanism clamping the traction body and the second anchor piece clamping the traction body in the traction body return stage of a preferred embodiment of the present application;

[0032] Figure 6 Structure diagram of the first anchor piece and the first spring device of a preferred embodiment of the present application;

[0033] Figure 7 Structure diagram of the push rod of a preferred embodiment of the present application;

[0034] Figure 8 Structure diagram of the construction application of the hydraulic lifting device of a preferred embodiment of the present application.

[0035] [The following is the description of the reference numerals]:

[0036] First hydraulic cylinder 1; piston rod 11 of the first hydraulic cylinder; first support rod 12; second support rod 13; support plate 14; third support rod 15; upper guide plate 16; lower guide plate 17; traction body 100; guide frame 101;

[0037] Upper anchor locking mechanism 2; lower anchor locking mechanism 3; first limiting device 31; first limiting piece 311; first stop piece 312; second limiting device 32; second limiting piece 321; second stop piece 322;

[0038] Driving device 41; anchor ring 42; first limiting conical hole 421; second limiting conical hole 422; first anchor piece 43; second anchor piece 44; transmission device 5; first anchor pressing plate 51; second anchor pressing plate 52; pushing device 6; connecting plate 61; push rod 62; first spring device 71; second spring device 72; screw 731; screw spring seat 732; spring seat 7321; screw seat 7322; spring 733; spring pressing plate 734; positioning device 735;

[0039] Load 8; lifting appliance 81; bottom anchor locking mechanism 82; support platform 9. DETAILED DESCRIPTION

[0040] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. The advantages and features of the present invention will become more apparent from the following description. It should be noted that the drawings are greatly simplified and not to exact scale, and are only used to facilitate and clearly illustrate the embodiments of the present invention.

[0041] In the description of the present invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of such features. In the description of the present invention, the meaning of "plurality" is at least two, for example, two, three, etc., unless otherwise specifically defined.

[0042] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," "fixed," and the like should be understood broadly. For example, they may refer to fixed connections, detachable connections, or integration; mechanical connections, electrical connections, or communication between them; direct connections or connections through an intermediate medium; and internal communication between two components or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0043] The present invention will be described in detail below with reference to the accompanying drawings and preferred embodiments. In the absence of conflict, the following embodiments and features therein may complement or be combined with each other.

[0044] Reference Figure 1 and Figure 8 As shown, the present invention provides a hydraulic lifting device that can automatically lower a traction body 100 after a load 8 is lifted into position. A guide frame 101 is mounted above the hydraulic lifting device to guide the traction body 100 downward. One end of the traction body 100 is output from the top of the hydraulic lifting device, passes around the guide frame 101, and then hangs freely. The other end of the traction body 100 is connected to the load 8 and can be driven by the hydraulic lifting device to raise or lower the load 8. The traction body 100 in this application is a flexible steel strand.

[0045] Continue to refer to Figure 8As shown, when the traction body 100 lifts the load 8, it is necessary to connect the traction body 100 to the sling 81, and then connect the sling 81 to the load 8, thereby achieving the connection between the traction body 100 and the load 8. Furthermore, the hydraulic lifting equipment also includes a bottom anchor locking mechanism 82 disposed within the sling 81. The bottom anchor locking mechanism 82 is connected to the end of the traction body 100 and is capable of clamping the traction body 100 to achieve the connection between the traction body 100 and the sling 81. Furthermore, the load 8 can be mounted on the bottom of the sling 81. In this case, the sling 81, the bottom anchor locking mechanism 82, and the load 8 can move with the traction body 100 in the first direction a or the second direction b. After the traction body 100 lifts or lowers the load 8 to a predetermined position, the bottom anchor locking mechanism 82 can be opened, i.e., the bottom anchor locking mechanism 82 releases the traction body 100, thereby allowing the sling 81 to be removed from the bottom of the traction body 100.

[0046] In this embodiment, the first direction a is upward and the second direction b is downward. Of course, in other embodiments, the first direction a can be downward and the second direction b can be upward. For simplicity, the following description uses the first direction a as upward and the second direction b as downward as an example. However, those skilled in the art should be able to modify the following description to obtain an embodiment in which the first direction a is downward and the second direction b is upward.

[0047] During the process of the hydraulic lifting equipment lifting the load 8, the traction body 100 rises synchronously with the load 8. Since the load 8 attached to the traction body 100 has a greater gravity, during the process of the traction body 100 lifting the load 8, the weight of the traction body 100 below the upper anchor locking mechanism 2 of the hydraulic lifting equipment is always greater than the weight of the traction body 100 above the upper anchor locking mechanism 2. After the traction body 100 removes the load 8, since the traction body 100 has been lifted to a higher position, the weight of the traction body 100 below the upper anchor locking mechanism 2 is less than the weight of the traction body 100 above the upper anchor locking mechanism 2. At this time, if the sling 81 and the bottom anchor locking mechanism 82 are forcibly removed, the end of the traction body 100 that has bypassed the guide frame 101 will quickly fall to the ground, causing a safety accident. It should be understood that the weight of the traction body 100 above the upper anchor locking mechanism 2 refers to the weight of the traction body 100 after bypassing the guide frame 101.

[0048] Conventional hydraulic lifting equipment can only clamp and lift the traction body 100 and the load 8 when the weight of the traction body 100 below the upper anchor locking mechanism 2 is greater than the weight of the traction body 100 above the upper anchor locking mechanism 2. Due to the one-way self-locking property of the anchor, conventional hydraulic lifting equipment cannot clamp and lower the traction body 100 when the weight of the traction body 100 below the upper anchor locking mechanism 2 is less than the weight of the traction body 100 above the upper anchor locking mechanism 2. Unlike the prior art, the hydraulic lifting equipment provided by the present invention can solve this technical problem.

[0049] like Figure 1 and Figure 2 As shown, the hydraulic lifting equipment provided by the present invention includes a first hydraulic cylinder 1, a first support rod 12, a second support rod 13, a support plate 14, a guide plate, an upper anchor locking mechanism 2 and a lower anchor locking mechanism 3; the first support rod 12 is connected to the first hydraulic cylinder 1 and is used to support the first hydraulic cylinder 1; the upper anchor locking mechanism 2 and the lower anchor locking mechanism 3 are respectively arranged above and below the first hydraulic cylinder 1; the upper anchor locking mechanism 2 is connected to the first hydraulic cylinder 1 and is used to clamp and drive the traction body 100 upward under the drive of the first hydraulic cylinder 1 Or move downward; the first support rod 12, the support plate 14 and the second support rod 13 are connected in sequence in the vertical direction, the second support rod 13 is arranged above the guide plate and connected to the guide plate, the lower anchor locking mechanism 3 is connected to the support plate 14, and is used to clamp and fix the traction body 100; the upper anchor locking mechanism 2 and the lower anchor locking mechanism 3 are both selectively connected to the traction body 100; and when one of the upper anchor locking mechanism 2 and the lower anchor locking mechanism 3 is connected to the traction body 100, the other is connected to or not connected to the traction body 100.

[0050] In this embodiment, the upper anchor locking mechanism 2 is connected to the piston rod 11 of the first hydraulic cylinder. The hydraulic lifting equipment also includes a third support rod 15, and the number of the first support rod 12 (i.e., the middle support rod), the second support rod 13 (i.e., the lower support rod) and the third support rod 15 (i.e., the upper support rod) are four or more, and the plurality of third support rods 15 are evenly distributed on the outside of the upper anchor locking mechanism 2 in the circumferential direction. Similarly, the first support rod 12 and the second support rod 13 are evenly distributed on the outside of the lower anchor locking mechanism 3 in the circumferential direction. The guide plate also includes an upper guide plate 16 and a lower guide plate 17. The upper guide plate 16, the lower guide plate 17 and the support plate 14 are all provided with through holes for passing the traction body 100 to jointly limit the extension direction of the traction body 100. Specifically, the lower guide plate 17 is placed on the support platform 9 (refer to Figure 8The second support rod 13 is arranged above the lower guide plate 17 and connected with the lower guide plate 17, the second support rod 13 is also connected with the support plate 14 and used for supporting the support plate 14, the lower anchor locking mechanism 3 is placed on the upper portion of the support plate 14, the support plate 14 is used for supporting the lower anchor locking mechanism 3, the two ends of the first support rod 12 are respectively connected with the first hydraulic cylinder 1 and the support plate 14 and used for supporting the first hydraulic cylinder 1, the two ends of the third support rod 15 are respectively connected with the first hydraulic cylinder 1 and the upper guide plate 16 and used for supporting the upper guide plate 16. In the vertical direction, the upper anchor locking mechanism 2 is arranged between the upper guide plate 16 and the first hydraulic cylinder 1, and the lower anchor locking mechanism 3 is arranged between the first hydraulic cylinder 1 and the lower guide plate 17.

[0051] It should be understood that when the traction body 100 lifts the load 8, the position of the upper anchor locking mechanism 2 is not fixed due to being driven by the first hydraulic cylinder 1, and the position of the lower anchor locking mechanism 3 is always fixed. And the lower anchor locking mechanism 3 is used for releasing or clamping the traction body 100 when the upper anchor locking mechanism 2 clamps the traction body 100, and is used for clamping the traction body 100 when the upper anchor locking mechanism 2 releases the traction body 100. It should also be understood that in this application, the upper anchor locking mechanism 2 or the lower anchor locking mechanism 3 clamps the traction body 100 means that the upper anchor locking mechanism 2 or the lower anchor locking mechanism 3 can have the ability to clamp the traction body 100, that is, the upper anchor locking mechanism 2 or the lower anchor locking mechanism 3 has prepared to clamp the traction body 100. And the upper anchor locking mechanism 2 or the lower anchor locking mechanism 3 releases the traction body 100 means that the upper anchor locking mechanism 2 or the lower anchor locking mechanism 3 does not have the ability to clamp the traction body 100, at this time the traction body 100 can move relative to the upper anchor locking mechanism 2 or the lower anchor locking mechanism 3.

[0052] Specifically, when the hydraulic lifting device lifts the load 8, the upper anchor locking mechanism 2 is caused to clamp the traction body 100, the lower anchor locking mechanism 3 releases or clamps the traction body 100, and the first hydraulic cylinder 1 extends and drives the upper anchor locking mechanism 2 to drive the traction body 100 upward. When the first hydraulic cylinder 1 extends to the limit position, the lower anchor locking mechanism 3 is caused to clamp the traction body 100, and then the first hydraulic cylinder 1 retracts and the upper anchor locking mechanism 2 releases the traction body 100, and drives the upper anchor locking mechanism 2 to descend without load; when the first hydraulic cylinder 1 retracts to the limit position, the upper anchor locking mechanism 2 is caused to clamp the traction body 100 again, and then the first hydraulic cylinder 1 extends again, and at the same time the lower anchor locking mechanism 3 releases or clamps the traction body 100, thereby driving the upper anchor locking mechanism 2 to drive the traction body 100 to rise again; the above steps are repeated in sequence until the load 8 is lifted to the desired position. When the hydraulic lifting device lowers the load 8, the lower anchor locking mechanism 3 is made to clamp the traction body 100, the upper anchor locking mechanism 2 releases the traction body 100, and the first hydraulic cylinder 1 extends and drives the upper anchor locking mechanism 2 to rise without load. When the first hydraulic cylinder 1 is extended to the limit position, the upper anchor locking mechanism 2 is made to clamp the traction body 100, the first hydraulic cylinder 1 continues to extend, the lower anchor locking mechanism 3 releases the traction body 100, and then the first hydraulic cylinder 1 retracts and drives the upper anchor locking mechanism 2 to lower the traction body 100; when the first hydraulic cylinder 1 is retracted to the limit position, the lower anchor locking mechanism 3 is made to clamp the traction body 100 again, the first hydraulic cylinder 1 continues to retract, the upper anchor locking mechanism 2 releases the traction body 100, and then the first hydraulic cylinder 100 extends again, thereby driving the upper anchor locking mechanism 2 to rise again without load, and the above steps are repeated in sequence until the load 8 is lowered to the desired position.

[0053] It should be understood that the extension movement of the first hydraulic cylinder 1 refers to the process of the piston rod 11 of the first hydraulic cylinder gradually extending out of the first hydraulic cylinder 1, and the retraction movement of the first hydraulic cylinder 1 refers to the process of the piston rod 11 of the first hydraulic cylinder gradually retracting into the first hydraulic cylinder 1.

[0054] Further, refer to Figure 1 and Figure 2As shown, both the upper anchor locking mechanism 2 and the lower anchor locking mechanism 3 include a drive device 41, an anchor ring 42, a first anchor plate 43, and a second anchor plate 44. The anchor ring 42 of the upper anchor locking mechanism 2 is connected to the piston rod 11 of the first hydraulic cylinder; the anchor ring 42 of the lower anchor locking mechanism 3 is connected to the support plate 14. In this embodiment, the anchor ring 42 of the lower anchor locking mechanism 3 is connected to the second support rod 13 via the support plate 14. The drive device 41 is connected to the first anchor plate 43 and the second anchor plate 44, respectively, to drive the first anchor plate 43 and the second anchor plate 44 to move relative to the anchor ring 42. The first anchor plate 43 and the second anchor plate 44 are used to clamp or release the traction body 100 under the drive of the drive device 41. Furthermore, the driving device 41 drives the first anchor plate 43 to move relative to the anchor ring 42 in the first direction a, thereby causing the first anchor plate 43 to release the traction body 100. The driving device 41 drives the first anchor plate 43 to move relative to the anchor ring 42 in the second direction b, thereby causing the first anchor plate 43 to clamp the traction body 100. In addition, the driving device 41 drives the second anchor plate 44 to move relative to the anchor ring 42 in the first direction a, thereby causing the second anchor plate 44 to clamp the traction body 100. The driving device 41 drives the second anchor plate 44 to move relative to the anchor ring 42 in the second direction b, thereby causing the second anchor plate 44 to release the traction body 100.

[0055] It should be noted that when the weight of the traction body 100 below the first anchor plate 43 is greater than the weight of the traction body 100 above the first anchor plate 43, the first anchor plate 43 and the second anchor plate 44 of the upper anchor locking mechanism 2 are subjected to the pulling force along the second direction b applied by the traction body 100. At this time, the first anchor plate 43 can clamp the traction body 100 and can drive the traction body 100 to move along the first direction a (load lifting stage) or the second direction b (load lowering stage). At this time, the second anchor plate 44 clamps the traction body 100, but does not clamp the traction body 100, so the second anchor plate 44 cannot drive the traction body 100 to move. When the weight of the traction body 100 below the second anchor plate 44 is less than the weight of the traction body 100 above the second anchor plate 44, the first anchor plate 43 and the second anchor plate 44 are subjected to the pulling force applied by the traction body 100 along the first direction a. At this time, the second anchor plate 44 can clamp the traction body 100 and can drive the traction body 100 to move along the second direction b (the return stage of the traction body 100). At this time, the first anchor plate 43 clamps the traction body 100 but does not clamp the traction body 100. Therefore, the first anchor plate 43 cannot drive the traction body 100 to move.

[0056] Such a configuration allows the hydraulic lifting device to automatically pull the load 8 back to the traction body 100 after lifting it into position without the need for external equipment assistance, facilitating the re-lifting of the traction body 100 and simplifying the working steps of the hydraulic lifting device. This significantly reduces the preparation time for re-lifting the traction body 100, improves the efficiency of the hydraulic lifting device in lifting loads 8 multiple times, eliminates safety hazards in the lifting preparation stage, and reduces the overall cost of lifting multiple loads 8. It ensures the safety and reliability of the descent process of the traction body 100, thus filling the gap in the technical field of automatic return of the traction body 100 in hydraulic lifting devices. It should be understood that when the lower portion of the traction body 100 is connected to a sling for mounting the load 8 and / or the load 8, the weight of the traction body 100 below the first anchor plate 43 or the second anchor plate 44 refers to the sum of the weight of the traction body 100 below the first anchor plate 43 or the second anchor plate 44, the weight of the sling, and the weight of the load 8.

[0057] In more detail, when the gravity of the traction body 100 above the first anchor plate 43 is less than the gravity of the traction body 100 below the first anchor plate 43 or the second anchor plate 44 (usually occurs when the traction body 100 drives the load 8 to rise or fall), the driving device 41 of the upper anchor locking mechanism 2 can drive the first anchor plate 43 to clamp the traction body 100. At this time, the first anchor plate 43 can clamp the traction body 100 and can drive the traction body 100 to rise or fall under the drive of the first hydraulic cylinder 1, thereby realizing the rising or falling of the load 8. Moreover, after the upper anchor locking mechanism 2 is switched, when the gravity of the traction body 100 above the first anchor plate 43 is greater than the gravity of the traction body 100 below the first anchor plate 43 or the second anchor plate 44 (usually occurs in the early stage of the traction body 100 returning without load after the hydraulic lifting equipment unloads the load 8), the driving device 41 of the upper anchor locking mechanism 2 drives the first anchor plate 43 and the second anchor plate 44 to clamp the traction body 100 together. During this period, the second anchor plate 44 can clamp the traction body 100 and can pull the traction body 100 back under the drive of the first hydraulic cylinder 1. ; As the traction body 100 descends, the weight of the traction body 100 below the first anchor plate 43 or the second anchor plate 44 gradually increases. When the gravity of the traction body 100 above the first anchor plate 43 is less than the gravity of the traction body 100 below the first anchor plate 43 or the second anchor plate 44 (usually occurs after the hydraulic lifting equipment unloads the load 8 and the traction body 100 returns empty-handed in the later stage), the first anchor plate 43 can clamp the traction body 100 and can continue to drive the traction body 100 to descend under the drive of the first hydraulic cylinder 1, thereby realizing the empty-handed return of the traction body 100.

[0058] It should be understood that during the load 8 lifting phase, when the first anchor plate 43 of the upper anchor locking mechanism 2 clamps the traction body 100 and drives the traction body 100 upward, the first anchor plate 43 and the second anchor plate 44 of the lower anchor locking mechanism 3 may release the traction body 100, or the first anchor plate 43 of the lower anchor locking mechanism 3 clamps the traction body 100, and the second anchor plate 44 releases the traction body 100. During the traction body 100 returning phase, when the first anchor plate 43 and the second anchor plate 44 of the upper anchor locking mechanism 2 both release the traction body 100, the first anchor plate 43 and the second anchor plate 44 of the lower anchor locking mechanism 3 jointly clamp the traction body 100; and when the first anchor plate 43 and the second anchor plate 44 of the upper anchor locking mechanism 2 jointly clamp the traction body 100, the first anchor plate 43 and the second anchor plate 44 of the lower anchor locking mechanism 3 both release the traction body 100. In this way, no matter the gravity of the traction body 100 is greater above the first anchor plate 43 or the second anchor plate 44, or the gravity of the traction body 100 is greater below the first anchor plate 43 or the second anchor plate 44, the lower anchor locking mechanism 3 can enable the driving device 41 of the lower anchor locking mechanism 3 to drive the first anchor plate 43 or the second anchor plate 44 to clamp the traction body 100, thereby preventing the traction body 100 from falling in the first direction a or the second direction b when rising or falling.

[0059] Continue to refer to Figure 1 and Figure 2 As shown, the anchor ring 42 is provided with a first limiting tapered hole 421 and a second limiting tapered hole 422 coaxially arranged up and down. The first limiting tapered hole 421 cooperates with the first anchor plate 43, and the second limiting tapered hole 422 cooperates with the second anchor plate 44.

[0060] The hydraulic lifting device is configured such that: when the driving device 41 drives the first anchor plate 43 to move in the second direction b, at least a portion of the first anchor plate 43 enters the first limiting tapered hole 421 until the first anchor plate 43 clamps the traction body 100; when the driving device 41 drives the first anchor plate 43 to move in the first direction a, at least a portion of the first anchor plate 43 disengages from the first limiting tapered hole 421 until the first anchor plate 43 releases the traction body 100. The hydraulic lifting device is further configured such that: when the driving device 41 drives the second anchor plate 44 to move in the first direction a, at least a portion of the second anchor plate 44 enters the second limiting tapered hole 422 until the second anchor plate 44 clamps the traction body 100; and when the driving device 41 drives the second anchor plate 44 to move in the second direction b, at least a portion of the second anchor plate 44 disengages from the second limiting tapered hole 422 until the second anchor plate 44 releases the traction body 100.

[0061] Preferably, each of the first anchor plate 43 and the second anchor plate 44 is a hollow, truncated cone-shaped structure formed by splicing at least two self-locking segments. A gap exists between any two segments after the traction body 100 is inserted. The outer diameter of the first anchor plate 43 gradually increases from one end to the other along the first direction a. The shape of the first limiting tapered hole 421 matches the outer surface shape of the first anchor plate 43, i.e., the area of ​​the upper surface of the first limiting tapered hole 421 is larger than the area of ​​the lower surface. When the first anchor plate 43 enters the first limiting tapered hole 421, the gap between any adjacent segments of the first anchor plate 43 gradually decreases until the first anchor plate 43 clamps the traction body 100.

[0062] Furthermore, the outer diameter of the second anchor plate 44 gradually decreases from one end to the other along the first direction a. The shape of the second limiting tapered hole 422 matches the outer surface shape of the second anchor plate 44. That is, the area of ​​the upper surface of the second limiting tapered hole 422 is smaller than the area of ​​the lower surface. When the second anchor plate 44 enters the second limiting tapered hole 422, the gap between any adjacent segments of the second anchor plate 44 gradually decreases until the second anchor plate 44 clamps the traction body 100.

[0063] In this embodiment, the first and second anchor plates 43 and 44 are hollow, truncated cone-shaped structures formed by splicing three self-locking segments. A receiving hole for accommodating the traction body 100 is defined between the three segments, and the traction body 100 is placed in the receiving hole. The three segments are preferably of the same size. The outer surfaces of the segments are relatively smooth, while the inner surfaces are provided with threaded teeth, enabling the first and second anchor plates 43 and 44 to clamp the traction body 100. Preferably, the inclination angle of the outer surface of the first anchor plate 43 is 7.0°~7.2°, so that the inclination angle of the outer surface of the first anchor plate 43 can be slightly larger than the self-locking angle formed by the mutual friction between the first anchor plate 43 and the first limiting tapered hole 421. On the one hand, the first anchor plate 43 and the first limiting tapered hole 421 will not form a self-locking structure when they contact each other, thereby facilitating the fitting and disengagement of the first anchor plate 43 and the first limiting tapered hole 421, and further facilitating the clamping or release of the traction body 100 by the first anchor plate 43; on the other hand, when the inclination angle of the outer surface of the first anchor plate 43 is close to 7.0°, the first anchor plate 43 can enter the first limiting tapered hole 421 and form a larger clamping force on the traction body 100, which can ensure that the first anchor plate 43 can reliably clamp the traction body 100 and bear the weight of the load 8, and on the other hand, the first anchor plate 43 can be easily pulled out of the first limiting tapered hole 421. In this embodiment, the structure of the second anchor plate 44 is the same as that of the first anchor plate 43 .

[0064] The process by which the first anchor piece 43 or the second anchor piece 44 clamps the traction body 100 is as follows: when the first anchor piece 43 or the second anchor piece 44 is pressed and gradually enters the first limiting tapered hole 421 or the second limiting tapered hole 422, the gap between adjacent segments of the first anchor piece 43 or the second anchor piece 44 gradually decreases, that is, the inner diameter of the receiving hole gradually decreases. When the inner diameter of the receiving hole becomes smaller than the outer diameter of the traction body 100 during the process of the first anchor piece 43 or the second anchor piece 44 gradually entering the first limiting tapered hole 421 or the second limiting tapered hole 422, the first anchor piece 43 or the second anchor piece 44 can clamp the traction body 100.

[0065] Furthermore, there are multiple traction bodies 100, and the number of the first limiting conical holes 421 and the second limiting conical holes 422 are respectively multiple. The number of first anchor plates 43 corresponds to the number of the first limiting conical holes 421, and the number of second anchor plates 44 corresponds to the number of the first limiting conical holes 422. Each first anchor plate 43 can correspond to the position of a second anchor plate 44, so that each first anchor plate 43 and a corresponding second anchor plate 44 can jointly clamp a traction body 100.

[0066] Reference Figure 1 As shown, in this embodiment, the first anchor plate 43 and the second anchor plate 44 are both arranged in the vertical direction. A tractor 100 can pass through the corresponding first anchor plate 43 and second anchor plate 44, respectively. Therefore, the tractor 100 can be constantly clamped by the first anchor plate 43 or the second anchor plate 44 in the upper anchor locking mechanism 2 or the lower anchor locking mechanism 3 by the driving device 41, thereby preventing the tractor 100 from falling in the first direction a or the second direction b and causing a safety accident. Preferably, the multiple first anchor plates 43 have the same shape, size, and height, and the multiple second anchor plates 44 have the same shape, size, and height. In this arrangement, the multiple first anchor plates 43 can simultaneously enter the corresponding first limiting tapered holes 421, and the multiple second anchor plates 44 can simultaneously enter the corresponding second limiting tapered holes 422. This ensures that all tractor 2 can be clamped or released simultaneously, allowing all tractor 100 to reliably lift or lower the load 8.

[0067] Preferably, in the upper anchor locking mechanism 2, the vertical height of the second anchor plate 44 is smaller than the vertical height of the first anchor plate 43. Here, the vertical height of the second anchor plate 44 or the first anchor plate 43 is the height of the contact position between the traction body 100 and the second anchor plate 44 or the first anchor plate 43. The first anchor plate 43 of the upper anchor locking mechanism 2 is used to drive the load 8 upward, while the second anchor plate 44 of the upper anchor locking mechanism 2 is only used to clamp the traction body 100 and drive the traction body 100 back after the load 8 is removed. Since the weight that the first anchor plate 43 and the second anchor plate 44 can withstand is proportional to the effective contact height of the first anchor plate 43 and the second anchor plate 44 with the traction body 100, that is, the greater the effective contact height of the first anchor plate 43 and the second anchor plate 44 with the traction body 100, the greater the weight that the first anchor plate 43 and the second anchor plate 44 can withstand when clamping the traction body 100. When the first anchor plate 43 of the upper anchor locking mechanism 2 drives the load 8 to rise, the first anchor plate 43 needs to bear the weight of the traction body 100, the weight of the sling and the weight of the load 8, and when the second anchor plate 44 of the upper anchor locking mechanism 2 pulls the traction body down, the second anchor plate 44 only needs to bear part of the weight of the traction body 100. Therefore, the weight that the first anchor plate 43 needs to bear is much greater than the weight that the second anchor plate 44 needs to bear. In this way, the height of the second anchor plate 44 of the upper anchor locking mechanism 2 in the vertical direction can be smaller than the height of the first anchor plate 43 in the vertical direction. Similarly, the height of the second limiting cone hole 422 in the vertical direction is also smaller than the height of the first limiting cone hole 421 in the vertical direction, so that the structure of the upper anchor locking mechanism 2 is compact, and the purpose of the upper anchor locking mechanism 2 to lift the load 8 and lower the traction body 100 can be achieved.

[0068] Continue to refer to Figure 1 and Figure 2 As shown, the upper anchor locking mechanism 2 and the lower anchor locking mechanism 3 also include a transmission device 5, which is respectively connected to the driving device 41, the first anchor plate 43 and the second anchor plate 44. The transmission device 5 is used to drive the first anchor plate 43 or the second anchor plate 44 to move under the drive of the driving device 41.

[0069] In more detail, the transmission device 5 includes a first pressure anchor plate 51 and a second pressure anchor plate 52, and the upper anchor locking mechanism 2 and the lower anchor locking mechanism 3 also include a pushing device 6. The first pressure anchor plate 51 is respectively connected to the driving device 41 and the first anchor plate 43, and is used to drive the first anchor plate 43 to move under the drive of the driving device 41; the pushing device 6 is respectively connected to the driving device 41 and the second pressure anchor plate 52, and is used to drive the second pressure anchor plate 52 to move under the drive of the driving device 41; the second pressure anchor plate 52 is connected to the second anchor plate 44, and is used to drive the second anchor plate 44 to move under the drive of the pushing device 6.

[0070] Reference Figure 1 and Figure 2As shown, in this embodiment, the driving device 41 includes a second hydraulic cylinder, the piston rod (unnumbered) of which is connected to the first pressure anchor plate 51. In this arrangement, when the piston rod of the second hydraulic cylinder drives the first pressure anchor plate 51 to move in the first direction a, the first pressure anchor plate 51 can drive the first anchor plate 43 to gradually disengage from the first limiting tapered hole 421, allowing the first anchor plate 43 to release the traction body 100. Furthermore, when the piston rod of the second hydraulic cylinder drives the first pressure anchor plate 51 to move in the second direction b, the first pressure anchor plate 51 can drive the first anchor plate 43 to gradually enter the first limiting tapered hole 421, allowing the first anchor plate 43 to clamp the traction body 100. In this embodiment, there are multiple (at least two) second hydraulic cylinders, and the multiple second hydraulic cylinders are preferably evenly distributed along the outer edge of the anchor ring 42 on the connecting plate 61.

[0071] Continue to refer to Figure 2 As shown, the pushing device 6 includes a connecting plate 61 and a push rod 62. The connecting plate 61 is connected to the cylinder body of the second hydraulic cylinder, and the connecting plate 61 is connected to the push rod 62. The push rod 62 is connected to the second pressure anchor plate 52. When the second hydraulic cylinder drives the connecting plate 61 to move, it can cause the push rod 62 to drive the second pressure anchor plate 52 to move. In this embodiment, the connecting plate 61 is provided with a through hole for passing the piston rod of the second hydraulic cylinder. After the piston rod of the second hydraulic cylinder passes through the connecting plate 61, the end of the piston rod of the second hydraulic cylinder is fixedly connected to the first pressure anchor plate 51, and the cylinder body of the second hydraulic cylinder is fixedly connected to the connecting plate 61.

[0072] Preferably, the first pressure anchor plate 51, the second pressure anchor plate 52, the connecting plate 61 and the anchor ring 42 are preferably arranged in parallel in the vertical direction, and the push rod 62 is vertically connected to the connecting plate 61 and the second pressure anchor plate 52 respectively. In this embodiment, the connecting plate 61 is placed on the anchor ring 42, the first pressure anchor plate 51 is arranged above the connecting plate 61, and the second pressure anchor plate 52 is arranged below the connecting plate 61. The structure of the push rod 62 is as follows Figure 7 As shown, the push rod 62 has one end with a larger diameter and another end with a smaller diameter. A through hole for accommodating the push rod 62 is provided on the anchor ring 42. After the push rod 62 passes through the anchor ring 42, the end with a larger diameter is threadedly connected to the connecting plate 61, and the end with a smaller diameter is connected to the second pressure anchor plate 52 through a nut.

[0073] Reference Figure 2As shown, the upper anchor locking mechanism 2 and the lower anchor locking mechanism 3 both further include a first limiting device 31 and a second limiting device 32. The first limiting device 31 includes a first limiting member 311 and a first stopper 312. The first stopper 312 is sleeved on the first limiting member 311 and is used to define the minimum distance between the anchor ring 42 and the first pressure anchor plate 51. The first limiting member 311 is used to pass through the first stopper 312 and then connect to the anchor ring 42. In this embodiment, the first limiting member 311 is a first bolt, and the first stopper 312 is a first sleeve sleeved on the first limiting member 311. The first pressure anchor plate 51 is provided with a through hole for the first limiting member 311 (the screw of the first bolt) to pass through. The connecting plate 61 is also provided with a through hole for the first stopper 312 to pass through. The first limiting member 311 (the screw of the first bolt) is used to pass through the first pressure anchor plate 51 and the first stopper 312 in sequence and then connect to the anchor ring 42. Specifically, the first pressure anchor plate 51 can move in the second direction b under the drive of the piston rod of the second hydraulic cylinder. When the first pressure anchor plate 51 contacts the upper surface of the first sleeve, the distance between the first pressure anchor plate 51 and the anchor ring 42 reaches the minimum value, that is, the first pressure anchor plate 51 cannot continue to move in the second direction b. At this time, the first anchor plate 43 clamps the traction body 100.

[0074] Preferably, the first pressure anchor plate 51 can move in the first direction a under the drive of the piston rod of the second hydraulic cylinder. When the first pressure anchor plate 51 contacts the head of the first bolt, the distance between the first pressure anchor plate 51 and the anchor ring 42 reaches a maximum value, that is, the first pressure anchor plate 51 cannot continue to move in the first direction a. At this time, the first anchor plate 43 releases the traction body 100.

[0075] In this embodiment, there are multiple first bolts and multiple first sleeves that cooperate with the first bolts. The multiple first bolts and multiple first sleeves are evenly distributed on the connecting plate 61. The multiple first bolts pass through corresponding first sleeves and are respectively threadedly connected to the anchor ring 42. The multiple first bolts and multiple first sleeves have the same height. In this way, the multiple first bolts can simultaneously limit the position of the first pressure anchor plate 51, and the multiple first sleeves can also simultaneously limit the position of the first pressure anchor plate 51, ensuring that the first pressure anchor plate 51 is always parallel to the anchor ring 42.

[0076] Furthermore, the second limiting device 32 includes a second limiting member 321 and a second stop member 322. The second stop member 322 is sleeved on the second limiting member 321 and is movably threadedly connected to the second limiting member 321. The second stop member 322 is used to limit the position of the connecting plate 61. The second limiting member 321 is a second bolt. The screw end of the second limiting member 321 passes through the second stop member 322 and is connected to the anchor ring 42. In this embodiment, the second stopper 322 is a second nut, and the second stopper 321 is externally threaded, allowing the second stopper 322 to rotate on the second stopper 321. The first pressure anchor plate 51 is provided with a through hole for the second stopper 321 to pass through, and the outer diameter of the through hole in the first pressure anchor plate 51 is larger than the outer diameters of the second stopper 321 and the second stopper 322. The connecting plate 61 is provided with a through hole for the screw end of the second stopper 321 to pass through, and the diameter of the through hole in the connecting plate 61 is larger than the outer diameter of the screw end of the second stopper 321 but smaller than the outer diameter of the second stopper 322. The second stopper 321 passes through the first pressure anchor plate 51, the second stopper 322, and the connecting plate 61 in sequence, and is connected to the anchor ring 42. It should be understood that all through holes in the connecting plate 61 are independently provided and do not interfere with each other, to ensure effective coordination between the connecting plate 61 and various components.

[0077] When the first anchor piece 43 needs to clamp or release the traction body 100, and the second anchor piece 44 needs to release the traction body 100, the second stopper 322 is abutted against the connecting plate 61 to limit the position of the connecting plate 61, at this time the connecting plate 61 cannot move towards the first direction a or the second direction b. Then, the driving device 41 drives the first anchor pressing plate 51 to drive the first anchor piece 43 to move towards the first direction a or the second direction b to clamp or release the traction body 100. When the first anchor piece 43 and the second anchor piece 44 both need to clamp the traction body 100, the driving device 41 drives the first anchor pressing plate 51 to drive the first anchor piece 43 to release the traction body 100, and then the second stopper 322 is rotated anticlockwise on the second limiting piece 321 to the required position, at this time the second stopper 322 no longer limits the original position of the second anchor pressing plate 52 and the connecting plate 61. Then, the driving device 41 drives the first anchor pressing plate 51 to drive the first anchor piece 43 to move towards the second direction b to make the first anchor piece 43 clamp the traction body 100; the driving device 41 also drives the second anchor pressing plate 52 to drive the second anchor piece 44 to move towards the first direction a to make the second anchor piece 44 clamp the traction body 100. It should be understood that after the second stopper 322 is rotated to the required position on the second limiting piece 321, the movement of the driving device 41 driving the first anchor pressing plate 51 and the movement of the driving device 41 driving the connecting plate 61 can be completed in sequence. In an embodiment, the driving device 41 first drives the first anchor pressing plate 51 to move towards the second direction b until the first anchor piece 43 clamps the traction body 100, and then drives the connecting plate 61 to move towards the first direction a until the second anchor piece 44 clamps the traction body 100; in another embodiment, the driving device 41 first drives the connecting plate 61 to move towards the first direction a until the second anchor piece 44 clamps the traction body 100, and then drives the first anchor pressing plate 51 to move towards the second direction b until the first anchor piece 43 clamps the traction body 100.

[0078] Further, when the second hydraulic cylinder drives the first anchor pressing plate 51 to drive the first anchor piece 43 to release the traction body 100, the moving distance of the first anchor pressing plate 52 in the second direction b to abut against the first stopper 312 is set as a first moving distance, and the moving distance of the connecting plate 61 in the first direction a to abut against the second stopper 321 is set as a second moving distance; the sum of the first moving distance and the second moving distance is less than the stroke of the second hydraulic cylinder, so that the first anchor piece 43 and the second anchor piece 44 can successively clamp the traction body 100 under the drive of the second hydraulic cylinder.

[0079] The working process of the upper anchor locking mechanism 2 and the lower anchor locking mechanism 3 clamping or releasing the traction body 100 is as follows:

[0080] 1) Load lifting stage: the second anchor piece 44 always releases the traction body 100, and the first anchor piece 43 releases the traction body 100

[0081] Referring toFigure 2 As shown, the second stopper 322 is pressed against the connecting plate 61. At this time, the second pressure anchor plate 52 is in a position where the second anchor plate 44 can release the traction body 100. The second hydraulic cylinder extends and drives the first pressure anchor plate 51 to drive the first anchor plate 43 to move in the first direction a until the first anchor plate 43 releases the traction body.

[0082] 2) During the load lifting phase, the second anchor plate 44 always releases the traction body 100, while the first anchor plate 43 clamps the traction body 100.

[0083] Reference Figure 3 As shown, the second stopper 322 is pressed against the connecting plate 61. At this time, the second pressure anchor plate 52 is in a position where the second anchor plate 44 can release the traction body 100. After the second hydraulic cylinder extends to the first anchor plate 43 to release the traction body 100, the second hydraulic cylinder retracts and drives the first pressure anchor plate 51 to drive the first anchor plate 43 to move in the second direction b until the first pressure anchor plate 51 presses against the first stopper 312. At this time, the first anchor plate 43 clamps the traction body.

[0084] 3) The first anchor plate 43 and the second anchor plate 44 release the traction body 100 during the preparation stage for the traction body return.

[0085] Reference Figure 4 As shown, the second hydraulic cylinder is extended and drives the first pressure anchor plate 51 to drive the first anchor plate 43 to move in the first direction a until the first anchor plate 43 releases the traction body. The second stopper 322 is manually rotated counterclockwise to the desired position. At this time, the connecting plate 61 abuts against the anchor ring 42, and the second anchor plate 44 releases the traction body 100.

[0086] 4) During the return phase of the traction body, the first anchor plate 43 and the second anchor plate 44 jointly clamp the traction body 100

[0087] Reference Figure 5 As shown, after the second hydraulic cylinder is extended to the first anchor plate 43 to release the traction body 100, the second stop 322 is manually or automatically rotated to the desired position, the second hydraulic cylinder retracts and drives the first pressure anchor plate 51 to drive the first anchor plate 43 to move in the second direction b until the first anchor plate 43 clamps the traction body 100 and the first pressure anchor plate 51 abuts the first stop; then the second hydraulic cylinder drives the connecting plate 61 to move in the first direction a, and the connecting plate 61 drives the second pressure anchor plate 52 and the second anchor plate 44 to move in the first direction a through the push rod 62 until the second anchor plate 44 clamps the traction body and the connecting plate 61 abuts the second stop 322.

[0088] It should be understood that when the hydraulic lifting device is lifting or lowering the load 8, the first anchor plate 43 of the upper anchor locking mechanism 2 needs to clamp and drive the traction body 100 to rise or fall. At this time, the second stopper 322 of the upper anchor locking mechanism 2 needs to abut against the connecting plate 61, and the connecting plate 61 abuts against the anchor ring 42, so that the upper anchor locking mechanism 2 has the first anchor plate 43 clamping or releasing the traction body 100, and the second anchor plate 44 always releases the traction body 100. During this process, the second anchor plate 44 of the lower anchor locking mechanism 3 always releases the traction body 100, and the first anchor plate 43 of the lower anchor locking mechanism 3 needs to alternately clamp the traction body 100 with the first anchor plate 43 of the upper anchor locking mechanism 2. When the traction body 100 of the hydraulic lifting equipment is returning empty, the first anchor plate 43 or the second anchor plate 44 of the upper anchor locking mechanism 2 needs to jointly clamp and drive the traction body 100 downward. At this time, the second stopper 322 needs to be manually rotated counterclockwise to the desired position so that the first anchor plate 43 and the second anchor plate 44 of the upper anchor locking mechanism 2 can have two working states: jointly clamping or releasing the traction body 100. During this process, in order to prevent the traction body 100 from falling in the first direction a or the second direction b, the lower anchor locking mechanism 2 also needs to have two working states: jointly clamping or releasing the traction body 100 with the first anchor plate 43 and the second anchor plate 44. The first anchor plate 43 and the second anchor plate 44 of the lower anchor locking mechanism 3 need to jointly release the traction body 100 when the upper anchor locking mechanism 2 clamps the traction body 100, and need to jointly clamp the traction body 100 when the upper anchor locking mechanism 2 releases the traction body 100.

[0089] Reference Figure 1 、 Figure 2 and Figure 6 As shown, the upper anchor locking mechanism 2 and the lower anchor locking mechanism 3 each further include a first spring device 71 and a second spring device 72. The first spring device 71 is connected to the first anchor plate 43 and is used to apply a first compressive force in a second direction b to the first anchor plate 43. The second spring device 72 is connected to the second anchor plate 44 and is used to apply a second compressive force in a first direction a to the second anchor plate 44. It should be understood that the first compressive force and the second compressive force both act as pre-tightening forces on the first and second anchor plates 43, 44, to ensure that each group of segments of the first and second anchor plates 43, 44 can quickly enter a clamping state under the action of the pre-tightening force, and can quickly and reliably clamp the traction body 100 when the traction body 100 is subjected to tension.

[0090] Preferably, the first spring device 71 and the second spring device 72 each include a screw 731, a screw spring seat 732, a spring 733, a spring pressure plate 734 and a positioning device 735 connected in sequence;

[0091] The screw 731 of the first spring device 71 is connected with the first anchor piece 43, and the screw spring seat 732 of the first spring device 71 is in sliding connection with the first anchor pressing plate 51 and is used to drive the first anchor piece 43 to move under the drive of the first anchor pressing plate 51; one end of the positioning device 735 of the first spring device 71 is connected with the spring pressing plate 734, and the other end is connected with the first anchor pressing plate 51, and the positioning device 735 of the first spring device 71 is used to limit the first pressing force of the first spring device 71 on the first anchor piece 43. The screw 731 of the second spring device 72 is connected with the second anchor piece 44, and the screw spring seat 732 of the second spring device 72 is in sliding connection with the second anchor pressing plate 52 and is used to drive the second anchor piece 44 to move under the drive of the second anchor pressing plate 52; one end of the positioning device 735 of the second spring device 72 is connected with the spring pressing plate 734, and the other end is connected with the second anchor pressing plate 52, and the positioning device 735 of the second spring device 72 is used to limit the second pressing force of the second spring device 72 on the second anchor piece 44.

[0092] In the embodiment, the screw 731 is in threaded connection with the first anchor piece 43 and the second anchor piece 44 respectively, the screw spring seat 732 of the upper anchor locking mechanism 2 is sleeved on the first anchor pressing plate 51, the screw spring seat 732 of the lower anchor locking mechanism 3 is sleeved on the second anchor pressing plate 52, the spring 732 of the upper anchor locking mechanism 2 and the spring 733 of the lower anchor locking mechanism 3 are both in compression state, and the positioning device 735 of the upper anchor locking mechanism 2 is used to limit the (minimum) pressing force of the spring 733 of the upper anchor locking mechanism 2 on the first anchor piece 43; the positioning device 735 of the lower anchor locking mechanism 3 is used to limit the (minimum) pressing force of the spring 733 of the lower anchor locking mechanism 3 on the second anchor piece 44. The screw spring seat 732 of the upper anchor locking mechanism 2 or the screw spring seat 732 of the lower anchor locking mechanism 3 transmits the first pressing force and the second pressing force to the first anchor piece 43 or the second anchor piece 44 through the screw 731. Referring to Figure 2 , the positioning device 735 can be provided as a third bolt and a second sleeve to limit the distance between the screw spring seat 732 and the spring pressing plate 734. In the embodiment, the first anchor pressing plate 51 and the second anchor pressing plate 52 are respectively provided with through holes for the screw spring seat 732 to pass through, and are respectively provided with threaded holes connected with the third bolt. It should be understood that all the through holes on the first anchor pressing plate 51 and the second anchor pressing plate 52 are independently provided and do not interfere with each other, so as to ensure the effective cooperation between the first anchor pressing plate 51 and the second anchor pressing plate 52 and the components.

[0093] Referring to Figure 2 and Figure 6As shown, in this embodiment, the screw spring seat 732 includes a threaded spring seat 7321 and a screw seat 7322. Both the spring seat 7321 and the screw seat 7322 are provided with through-holes for receiving the traction body 100. The upper and lower surfaces of the spring seat 7321 are provided with grooves (unnumbered). The groove on the upper surface of the spring seat 7321 is used to accommodate the spring 733, while the groove on the lower surface of the spring seat 7322 is used to accommodate a portion of the screw seat 7322. The screw seat 7322 is provided with a stepped hole for receiving the screw 731. The screw 731 passes through the stepped hole and is threadedly connected to the first anchor plate 43 or the second anchor plate 44. The inner diameter of the upper surface of the stepped hole is larger than the inner diameter of the lower surface. The larger inner diameter portion of the stepped hole is used to accommodate the head of the screw 731, while the smaller inner diameter portion of the stepped hole is used to accommodate the screw shaft of the screw 731. Preferably, there are three screws 731, each of which is connected to a segment of the first anchor plate 43 or the second anchor plate 44. The stepped hole of the screw seat 7322 has a radial dimension greater than the outer diameter of the screw 731, so that when any adjacent segments of the first anchor plate 43 or the second anchor plate 44 are in contact with each other, the multiple screws 731 can move synchronously with the segments of the first anchor plate 43 or the second anchor plate 44 and approach each other, thereby ensuring that the stepped hole of the screw seat 7322 does not hinder the movement of the segments of the first anchor plate 43 or the second anchor plate 44.

[0094] In a non-limiting embodiment, the working process of the hydraulic lifting device is:

[0095] 1) Initial installation conditions

[0096] The second stopper 322 in the upper anchor locking mechanism 2 is brought into contact with the connecting plate 61, which in turn is brought into contact with the anchor ring 42. The second hydraulic cylinder in the upper anchor locking mechanism 2 is then extended using a hand pump, driving the first pressure anchor plate 51 to move in the first direction a until the first anchor plate 43 in the upper anchor locking mechanism 2 is in a state of releasing the traction body 100. At this time, the second anchor plate 44 in the upper anchor locking mechanism 2 is also in a state of releasing the traction body 100. Subsequently, the second stopper 322 in the lower anchor locking mechanism 3 is brought into contact with the connecting plate 61, which in turn is brought into contact with the anchor ring 42. The second hydraulic cylinder in the lower anchor locking mechanism 3 is then extended using a hand pump, driving the first pressure anchor plate 51 to move in the first direction a until the first anchor plate 43 in the lower anchor locking mechanism 3 is in a state of releasing the traction body 100. At this time, the second anchor plate 44 in the lower anchor locking mechanism 3 is also in a state of releasing the traction body 100.

[0097] The traction body 100 is inserted sequentially through the lower guide plate 17, the first and second anchor plates 43 and 44 in the lower anchor locking mechanism 3, the first hydraulic cylinder 1, the first and second anchor plates 43 and 44 in the upper anchor locking mechanism 2, and the upper guide plate 16, while leaving sufficient length for the traction body 100 below the lower guide plate 17. A hand pump is then used to retract the second hydraulic cylinder in the upper anchor locking mechanism 2 and drive the first pressure anchor plate 51 to move in the second direction b until the first anchor plate 43 in the upper anchor locking mechanism 2 clamps the traction body 100. Simultaneously, a hand pump is used to retract the second hydraulic cylinder in the lower anchor locking mechanism 3 and drive the first pressure anchor plate 51 to move in the second direction b until the first anchor plate 43 in the lower anchor locking mechanism 3 clamps the traction body 100.

[0098] The hydraulic lifting equipment, with the traction bodies 100 threaded through it, is installed on the lifting platform. The bottom anchor locking mechanism 82 is engaged to clamp the traction bodies 100, connecting them to the sling 81, and the sling 81 to the load 8. The hydraulic, communication, and control systems of the hydraulic lifting equipment are then activated, causing the first hydraulic cylinder 1 to slowly extend, stretching each traction body 100 and placing it in tension. Subsequently, the first anchor plate 43 of the lower anchor locking mechanism 3 is engaged to clamp the traction bodies 100, while the first and second anchor plates 43, 44 of the upper anchor locking mechanism 2 release the traction bodies 100, completing the initial installation of the hydraulic lifting equipment.

[0099] 2) Hydraulic lifting equipment lifting or lowering load conditions

[0100] When it is confirmed that each traction body 100 is correctly installed, has no twisting, remains vertical and is evenly stressed, the load 8 is started to be lifted or lowered. The process of the hydraulic lifting equipment driving the load 8 to lift is as follows: the first anchor plate 43 in the upper anchor locking mechanism 2 clamps the traction body 100, the first hydraulic cylinder 1 slightly extends the cylinder to transfer the load 8 to the upper anchor locking mechanism 2, and the first anchor plate 43 and the second anchor plate 44 in the lower anchor locking mechanism 3 both release the traction body 100, or the first anchor plate 43 in the lower anchor locking mechanism 3 clamps the traction body 100 and the second anchor plate 44 releases the traction body 100, the first hydraulic cylinder 1 extends the cylinder and drives the upper anchor locking mechanism 2 to drive the load 8 to rise; when the first hydraulic cylinder 1 is extended to the limit position, the first anchor plate 43 in the lower anchor locking mechanism 3 clamps the traction body 100 and the second anchor plate 44 releases the traction body 100, the first hydraulic cylinder 1 slightly retracts the cylinder to transfer the load 8 to the lower anchor locking mechanism 3, the first anchor plate 43 of the upper anchor locking mechanism 2 releases the traction body 100, the first hydraulic cylinder 1 performs an unloaded retraction movement and drives the upper anchor locking mechanism 2 to descend unloaded. After the first hydraulic cylinder 1 is retracted to the limit position, the first anchor plate 43 in the upper anchor locking mechanism 2 clamps the traction body 100 again, and the first hydraulic cylinder 1 is slightly extended to transfer the load 8 to the upper anchor locking mechanism 2, so that the first anchor plate 43 and the second anchor plate 44 in the lower anchor locking mechanism 3 both release the traction body 100, or the first anchor plate 43 in the lower anchor locking mechanism 3 clamps the traction body 100 and the second anchor plate 44 releases the traction body 100, and then the first hydraulic cylinder 1 is extended again to continue the above-mentioned lifting process of the load 8 until the load 8 is lifted to the required height.

[0101] The hydraulic lifting device lowers the load 8 as follows: the first anchor plate 43 in the lower anchor locking mechanism 3 clamps the traction body 100, the first anchor plate 43 and the second anchor plate 44 in the upper anchor locking mechanism 2 release the traction body 100, and the first hydraulic cylinder 1 extends, driving the upper anchor locking mechanism 2 to ascend without load. When the first hydraulic cylinder 1 is extended to a position close to its limit, the first anchor plate 43 in the upper anchor locking mechanism 2 clamps the traction body 100, and the first hydraulic cylinder 1 slightly extends to transfer the load 8 to the upper anchor locking mechanism 2. Then the first anchor plate 43 and the second anchor plate 44 in the lower anchor locking mechanism 3 release the traction body 100, the first hydraulic cylinder 1 retracts and drives the first anchor plate 43 of the upper anchor locking mechanism 2 to drive the load 8 to descend. When the first hydraulic cylinder 1 retracts to a position close to the limit, the first anchor plate 43 in the lower anchor locking mechanism 3 clamps the traction body 100 and the second anchor plate 44 releases the traction body 100, the first hydraulic cylinder 1 retracts slightly to transfer the load 8 to the lower anchor locking mechanism 3, the first anchor plate 43 of the upper anchor locking mechanism 2 releases the traction body 100, the first hydraulic cylinder 1 performs an empty-load extension movement again and drives the upper anchor locking mechanism 2 to rise empty-load, while continuing the above-mentioned descending process of the load 8 until the load 8 is lowered to the required height.

[0102] It should be understood that during the lifting or lowering of the load 8, the second anchor plates 44 in the upper anchor locking mechanism 2 and the lower anchor locking mechanism 3 always release the traction body, allowing the first anchor plate 43 in the upper anchor locking mechanism 2 to drive the load 8 up or down. It should also be understood that when the load 8 is rising, because the bottom of the traction body 100 is connected to the load 8, the weight of the traction body 100 below the upper anchor locking mechanism 2 is always greater than the weight above the upper anchor locking mechanism 2. Therefore, the first anchor plate 43 in the upper anchor locking mechanism 2 can clamp the traction body 100 and drive the traction body 100 up or down. The first anchor plate 43 in the lower anchor locking mechanism 3 can also clamp the traction body 100, thereby preventing the traction body 100 from falling when the upper anchor locking mechanism 2 is opened.

[0103] 3) After the load is unloaded, the traction body returns without load

[0104] When the hydraulic lifting equipment lifts the load 8, after the load 8 is lifted to the desired position, the load 8 is unloaded. Generally speaking, at this time, the weight of the traction body 100 below the upper anchor locking mechanism 2 is less than the weight above the upper anchor locking mechanism 2.

[0105] In a non-limiting embodiment, the steps of the hydraulic lifting device pulling down the traction body 100 are specifically as follows:

[0106] First, the first anchor plate 43 and the second anchor plate 44 of the lower anchor locking mechanism 3 clamp the traction body. The first hydraulic cylinder 1 is extended to its limit position without load, so that the first anchor plate 43 and the second anchor plate 44 of the upper anchor locking mechanism 2 jointly clamp the traction body 100. Then, the first hydraulic cylinder 1 is slightly retracted to transfer the weight of the traction body 100 at the upper end of the upper anchor locking mechanism 2 to the upper anchor locking mechanism 2, and the first anchor plate 43 and the second anchor plate 44 of the lower anchor locking mechanism 3 release the traction body 100. When the first hydraulic cylinder 1 is retracted to the limit position, the first anchor plate 43 and the second anchor plate 44 of the lower anchor locking mechanism 3 clamp the traction body 100, and the first anchor plate 43 and the second anchor plate 44 of the upper anchor locking mechanism 2 release the traction body 100. If the second anchor plate 44 of the upper anchor locking mechanism 2 fails to release the traction body 100, the first hydraulic cylinder 1 needs to be slightly extended to transfer the gravity of the traction body 100 to the lower anchor locking mechanism 3, and the second anchor plate 44 of the upper anchor locking mechanism 2 can release the traction body 100. Then the first hydraulic cylinder 1 is extended again without load to near the limit position. At the same time, the upper anchor locking mechanism 2, the first hydraulic cylinder 1 and the lower anchor locking mechanism 3 repeat the above-mentioned working steps of lowering the traction body 100 to gradually lower the traction body 100.

[0107] When the traction body 100 is lowered, the weight of the traction body 100 above the upper anchor locking mechanism 2 is gradually equal to or less than the weight below the upper anchor locking mechanism 2. At this time, the first anchor plate 43 of the upper anchor locking mechanism 2 can clamp the traction body 100 and drive the traction body to return (i.e., drive the traction body 100 to move in the second direction b) until the traction body 100 is lowered to the height before the load 8 is lifted.

[0108] It should be understood that before the first anchor plate 43 and the second anchor plate 44 of the upper anchor locking mechanism 2 are lifted unloaded, the first anchor plate 43 and the second anchor plate 44 of the lower anchor locking mechanism 3 must first be made to clamp the traction body 100. This ensures that, regardless of whether the weight of the traction body 100 below the upper anchor locking mechanism 2 is less than or greater than the weight of the traction body 100 above the upper anchor locking mechanism 2, one of the first anchor plate 43 and the second anchor plate 44 of the lower anchor locking mechanism 3 can clamp the traction body 100, thereby preventing the traction body 100 from falling suddenly. Similarly, before the first anchor plate 43 and the second anchor plate 44 of the lower anchor locking mechanism 3 release the traction body 100, both the first anchor plate 43 and the second anchor plate 44 of the upper anchor locking mechanism 2 must first be made to clamp the traction body 100. This process can be achieved through the control system of the hydraulic lifting equipment.

[0109] The hydraulic lifting equipment provided by the present invention can automatically pull back the traction body 100 after lifting the load 8 into place through the hydraulic lifting equipment without the assistance of external equipment. This can facilitate the re-lifting of the traction body 100 and simplify the working steps of the hydraulic lifting equipment, greatly saving the preparation time for re-lifting the traction body 100, improving the working efficiency of the hydraulic lifting equipment in lifting the load 8 multiple times, and reducing the overall lifting cost, ensuring the safety and reliability of the descent process of the traction body 100, and filling the gap in the field of self-return technology of the traction body 100 in the hydraulic lifting equipment.

[0110] The above description is only a description of the preferred embodiments of the present invention and does not limit the scope of the present invention. Any changes and modifications made by ordinary technicians in the field of the present invention based on the above disclosure are within the scope of protection of the present invention.

Claims

1. A hydraulic lifting device for driving a traction body to rise or fall, characterized in that: The invention comprises a first hydraulic cylinder, a first support rod, a second support rod, a support plate, a guide plate, an upper anchor locking mechanism and a lower anchor locking mechanism; the first support rod is connected to the first hydraulic cylinder and is used to support the first hydraulic cylinder; the upper anchor locking mechanism and the lower anchor locking mechanism are respectively arranged above and below the first hydraulic cylinder; The upper anchor locking mechanism is connected to the first hydraulic cylinder and is used to clamp and drive the traction body to move in the vertical direction under the drive of the first hydraulic cylinder; the first support rod, the support plate and the second support rod are connected in sequence in the vertical direction, the second support rod is arranged above the guide plate and connected to the guide plate, and the lower anchor locking mechanism is connected to the support plate and is used to clamp and fix the traction body; the upper anchor locking mechanism and the lower anchor locking mechanism are both selectively connected to the traction body, and when one of the upper anchor locking mechanism and the lower anchor locking mechanism is connected to the traction body, the other is connected to or not connected to the traction body; The upper anchor locking mechanism and the lower anchor locking mechanism both include a driving device, an anchor ring, a first anchor plate and a second anchor plate; each of the first anchor plates can be arranged opposite to and in the opposite direction of one of the second anchor plates; the driving device is respectively connected to the first anchor plate and the second anchor plate to drive the first anchor plate and the second anchor plate to clamp the traction body or release the traction body; during the unloaded return stage of the traction body, the first anchor plate and the second anchor plate jointly clamp the traction body to prevent the traction body from falling in the first direction or the second direction when rising or falling.

2. The hydraulic lifting device according to claim 1, characterized in that The anchor ring of the upper anchor locking mechanism is connected to the piston rod of the first hydraulic cylinder, and the anchor ring of the lower anchor locking mechanism is connected to the support plate. The driving device drives the first anchor plate and the second anchor plate to move relative to the anchor ring; the first anchor plate and the second anchor plate are used to clamp the traction body or release the traction body under the drive of the driving device.

3. The hydraulic lifting device according to claim 2, characterized in that The anchor ring is provided with a first limiting tapered hole and a second limiting tapered hole coaxially arranged up and down, the first limiting tapered hole cooperates with the first anchor plate, and the second limiting tapered hole cooperates with the second anchor plate; When the driving device drives the first anchor plate to move in the second vertical direction, at least a portion of the structure of the first anchor plate enters the first limiting tapered hole; when the driving device drives the first anchor plate to move in the first vertical direction, at least a portion of the structure of the first anchor plate leaves the first limiting tapered hole. When the driving device drives the second anchor plate to move along the first direction, at least a portion of the second anchor plate enters the second limiting tapered hole; when the driving device drives the second anchor plate to move along the second direction, at least a portion of the second anchor plate leaves the second limiting tapered hole.

4. The hydraulic lifting device according to claim 3, characterized in that There are multiple traction bodies, and the number of the first limiting conical holes and the number of the second limiting conical holes are respectively multiple. The number of the first anchor plates corresponds to the number of the first limiting conical holes, and the number of the second anchor plates corresponds to the number of the first limiting conical holes. Each first anchor plate and a corresponding second anchor plate jointly clamp one traction body.

5. The hydraulic lifting device according to claim 3, characterized in that: The outer diameter of the first anchor sheet gradually increases from one end to the other end along the first direction, and the shape of the first limiting tapered hole matches the outer surface shape of the first anchor sheet; the outer diameter of the second anchor sheet gradually decreases from one end to the other end along the first direction, and the shape of the second limiting tapered hole matches the outer surface shape of the second anchor sheet.

6. The hydraulic lifting device according to claim 2, characterized in that: In the upper anchor locking mechanism, the height of the second anchor piece in the vertical direction is smaller than the height of the first anchor piece in the vertical direction.

7. The hydraulic lifting device according to any one of claims 2 to 6, characterized in that: The upper anchor locking mechanism and the lower anchor locking mechanism both further include a transmission device, which is respectively connected to the driving device, the first anchor plate and the second anchor plate, and is used to drive the first anchor plate or the second anchor plate to move respectively under the drive of the driving device.

8. The hydraulic lifting device according to claim 7, characterized in that: The upper anchor locking mechanism and the lower anchor locking mechanism both include a pushing device, and the transmission device includes a first pressure anchor plate and a second pressure anchor plate; the first pressure anchor plate is respectively connected to the driving device and the first anchor plate, and is used to drive the first anchor plate to move under the drive of the driving device; the pushing device is respectively connected to the driving device and the second pressure anchor plate, and is used to drive the second pressure anchor plate to move under the drive of the driving device; the second pressure anchor plate is connected to the second anchor plate, and is used to drive the second anchor plate to move under the drive of the pushing device.

9. The hydraulic lifting device according to claim 8, characterized in that The driving device includes a second hydraulic cylinder, the piston rod of the second hydraulic cylinder is connected to the first pressure anchor plate; the pushing device includes a connecting plate and a push rod; the connecting plate is connected to the cylinder body of the second hydraulic cylinder, and the connecting plate is connected to the push rod; the push rod is connected to the second pressure anchor plate; when the second hydraulic cylinder drives the connecting plate to move, it can prompt the push rod to drive the second pressure anchor plate to move.

10. The hydraulic lifting device according to claim 8, characterized in that The upper anchor locking mechanism and the lower anchor locking mechanism both further include a first spring device and a second spring device; the first spring device is connected to the first anchor plate and is used to apply a first compressing force in the second direction to the first anchor plate; the second spring device is connected to the second anchor plate and is used to apply a second compressing force in the first direction to the second anchor plate.

11. The hydraulic lifting device according to claim 10, characterized in that The first spring device and the second spring device each include a screw, a screw spring seat, a spring, a spring pressure plate and a positioning device connected in sequence; The screw of the first spring device is connected to the first anchor plate; the screw spring seat of the first spring device is slidably connected to the first pressure anchor plate and is used to drive the first anchor plate to move under the drive of the first pressure anchor plate; one end of the positioning device of the first spring device is connected to the spring pressure plate, and the other end is connected to the first pressure anchor plate; the positioning device of the first spring device is used to limit the first pressing force of the first spring device on the first anchor plate; The screw of the second spring device is connected to the second anchor plate; the screw spring seat of the second spring device is slidably connected to the second pressure anchor plate, and is used to drive the second anchor plate to move under the drive of the second pressure anchor plate; one end of the positioning device of the second spring device is connected to the spring pressure plate, and the other end is connected to the second pressure anchor plate; the positioning device of the second spring device is used to limit the second pressing force of the second spring device on the second anchor plate.

12. The hydraulic lifting device according to claim 9, characterized in that The upper anchor locking mechanism and the lower anchor locking mechanism both further include a first limiting device and a second limiting device, the first limiting device including a first limiting member and a first stopper; the first stopper is sleeved on the first limiting member and is used to limit the minimum distance between the anchor ring and the first pressure anchor plate; the first limiting member is used to pass through the first stopper and then connect to the anchor ring; The second limiting device includes a second limiting member and a second stop member, wherein the second stop member is sleeved on the second limiting member and is movably threadedly connected to the second limiting member; the second stop member is used to limit the position of the connecting plate; the second limiting member is used to pass through the second stop member and then connect to the anchor ring; When the first anchor plate is required to clamp or release the traction body, and the second anchor plate is required to release the traction body, the second stopper abuts against the connecting plate to limit the position of the connecting plate, and the driving device drives the first pressure anchor plate to drive the first anchor plate to move, so as to clamp or release the traction body; When both the first anchor plate and the second anchor plate are required to clamp the traction body, the driving device drives the first pressure anchor plate to drive the first anchor plate to release the traction body, and then moves the second stop member toward the first direction; the driving device drives the first pressure anchor plate to move toward the second direction until the first stop member abuts against the first pressure anchor plate, and the first anchor plate clamps the traction body; the driving device also drives the connecting plate to drive the push rod and the second pressure anchor plate to move toward the first direction until the connecting plate abuts against the second stop member, and the second anchor plate clamps the traction body.

13. The hydraulic lifting device according to claim 12, wherein: When the first pressure anchor plate moves to the limit position, the movement distance of the first pressure anchor plate in the second direction until it abuts against the first stopper is a first movement distance, and the movement distance of the connecting plate in the first direction until it abuts against the second stopper is a second movement distance; The sum of the first moving distance and the second moving distance is smaller than the stroke of the second hydraulic cylinder.

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