Hydraulic lifting equipment and its tensioning mechanism

Abstract

The present invention provides a hydraulic lifting device and a tensioning mechanism thereof, wherein the tensioning mechanism includes a driving device, a clamping device, and a limiting device; the clamping device includes a first clamping portion and a second clamping portion; the driving device is connected to the first clamping portion and is used to drive the first clamping portion to move relative to the second clamping portion; the limiting device is connected to the second clamping portion to limit the position of the second clamping portion; when the first clamping portion moves in a first direction, the second clamping portion clamps the traction body; when the first clamping portion moves in a second direction, the second clamping portion releases the traction body. The present invention can cooperate with the driving device and the limiting device to enable the traction body clamped by the clamping device to be tensioned during movement, thereby ensuring the safety and reliability of the hydraulic lifting device during operation.

Description

Technical Field

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

[0002] Hydraulic hoists are often used to lift loads in the field of lifting ultra-high, ultra-large, and ultra-heavy structures. Existing hydraulic hoists often use a computer-controlled multi-point hydraulic lifting method and use steel strands as rigging to lift the load.

[0003] In the prior art, each hydraulic lifter is equipped with multiple steel strands. It is difficult to ensure that each of the multiple steel strands is the same length during installation. Therefore, after preloading, the hydraulic lifter often experiences uneven tension and force on the steel strands. When the tension of the multiple steel strands varies significantly, only a few of the steel strands may be in tension after preloading. If the hydraulic lifter is used directly to lift a load at this time, the steel strands may be overloaded and break. In severe cases, the load may fall, resulting in a serious safety accident. For this reason, before the hydraulic lifter lifts a load, each steel strand needs to be pre-tensioned during the lifting and commissioning phase. After pre-tensioning, the load can only be lifted after the tension of each steel strand is basically uniform and visually inspected. At present, the tensioning of each steel strand generally requires pre-tensioning in two ways: using a manual hand winch or using a single-hole anchor and a main hydraulic cylinder to tension each steel strand one by one. However, tensioning each steel strand separately is not only labor-intensive and time-consuming, but also difficult to truly ensure that each steel strand is tensioned evenly. In addition, the pre-tensioning method using a single-hole anchor and a main hydraulic cylinder is more likely to break the steel strand and damage the equipment, which poses certain safety hazards. Summary of the Invention

[0004] The purpose of the present invention is to provide a hydraulic lifting device and a tensioning mechanism thereof to solve the problems of labor-consuming and time-consuming, uneven tensioning and certain safety hazards in the existing pre-tensioning of steel strands in the hydraulic lifter one by one.

[0005] To achieve at least one of the above objectives, the present invention provides a tensioning mechanism for hydraulic lifting equipment, which can be used to simultaneously tension multiple traction bodies, and includes a driving device, a clamping device, and a limiting device; the clamping device includes a first clamping portion and a second clamping portion; the driving device is connected to the first clamping portion and is used to drive the first clamping portion to move relative to the second clamping portion; the limiting device is connected to the second clamping portion to limit the position of the second clamping portion;

[0006] The tensioning mechanism is configured to enable each of the second clamping parts to clamp a corresponding one of the traction bodies when the driving device drives the first clamping part to move along the first direction;

[0007] The tensioning mechanism is further configured to cause each of the second clamping portions to release a corresponding one of the traction bodies when the driving device drives the first clamping portion to move along the second direction;

[0008] The tensioning mechanism is further configured such that, after the clamping device clamps the traction body, the driving device can drive the clamping device and the limiting device to move together along the first direction to tension all the traction bodies respectively; the first direction is opposite to the second direction.

[0009] Optionally, the first clamping portion and the limiting device are arranged in parallel up and down, and a limiting tapered hole is provided on the first clamping portion;

[0010] The tensioning mechanism is configured to, when the driving device drives the first clamping portion to move along the first direction, cause at least a portion of the second clamping portion to enter the limiting tapered hole until the second clamping portion clamps the traction body;

[0011] The tensioning mechanism is further configured such that, when the driving device drives the first clamping portion to move in a second vertical direction, at least a portion of the second clamping portion is disengaged from the limiting tapered hole until the second clamping portion releases the traction body. Optionally, the first clamping portion and the limiting device are both flat plates, the limiting tapered holes are multiple, the number of second clamping portions corresponds to the number of the limiting tapered holes, and each second clamping portion is used to clamp one traction body.

[0012] Optionally, the second clamping portion is a hollow truncated cone structure formed by splicing at least two pipe segments, a gap is formed between any two pipe segments after the traction body penetrates, the outer diameter of the second clamping portion gradually increases from one end to the other end along the first direction, and the shape of the limiting tapered hole matches the shape of the outer surface of the second clamping portion;

[0013] When the second clamping portion enters the limiting through hole, the gap between any adjacent pipe segments in the second clamping portion gradually decreases until the second clamping portion clamps the traction body.

[0014] Optionally, the inner surface roughness Ra and the outer surface roughness Ra of the second clamping portion are both less than or equal to 1.6 μm; and the Rockwell hardness HRA of the inner surface and the Rockwell hardness HRA of the outer surface of the second clamping portion are both greater than 80;

[0015] The tensioning mechanism is further configured such that, when a portion of the traction body is tensioned, the tensioned traction body can slide relative to the second clamping portion.

[0016] Optionally, the limiting device includes an anchor pressure plate and an anchor lifting plate, the anchor pressure plate is arranged parallel to the first clamping portion in a vertical direction, and the anchor lifting plate is connected to the anchor pressure plate and the second clamping portion respectively.

[0017] Optionally, the tensioning mechanism of the hydraulic lifting device further includes a supporting device connected to the limiting device, the limiting device is arranged above the first clamping portion, and the supporting device is arranged above the limiting device;

[0018] When clamping the traction body, the support device is used to fix the position of the limiting device;

[0019] After clamping the traction body, the driving device is used to drive the clamping device, the limiting device and part of the supporting device to move together along the first direction;

[0020] After all the traction bodies are tensioned, the support device is used to fix the position of the limiting device so that when the driving device drives the first clamping part to move along the second direction, the second clamping part can be separated from the first clamping part and release the traction body.

[0021] Optionally, the supporting device includes a first hydraulic cylinder with double action, double output rods and equal cross-section, one end of all piston rods in the first hydraulic cylinder is connected to the limiting device, and all the piston rods in the first hydraulic cylinder move synchronously.

[0022] Optionally, the tensioning mechanism of the hydraulic lifting device further includes a release traction device connected to the limiting device and the first clamping portion respectively;

[0023] After releasing the traction body, the driving device is used to drive the first clamping portion to drive the release traction device and the limiting device to move along the second direction, so that the release traction device drives part of the supporting device to move along the second direction.

[0024] Optionally, the release traction device includes a first limiting member and a first stop member, and the limiting device is provided with a receiving hole for the first limiting member to pass through, one end of the first limiting member is used to be connected to the first clamping portion, and the other end is used to be connected to the first stop member after passing through the receiving hole; the first stop member is used to abut against the limiting device to pull the limiting device to move along the second direction together with the release traction device.

[0025] Optionally, the tensioning mechanism of the hydraulic lifting equipment further includes a thrust assembly connected to the first clamping part and the driving device respectively, and the thrust assembly is used to drive the first clamping part to move under the drive of the driving device.

[0026] Optionally, the thrust assembly includes a first push rod, a second push rod, a push rod seat, and a second stop member; the first push rod and the second push rod are fixedly connected, the first push rod is connected to the first clamping portion, and the second push rod is connected to the second stop member; the outer diameter of the first push rod is larger than the outer diameter of the second push rod; the push rod seat is sleeved on the second push rod and can slide relative to the second push rod under the drive of the driving device;

[0027] The first push rod is used to drive the first clamping portion to move toward the first direction under the drive of the push rod seat, and the second stopper is used to drive the first clamping portion to move toward the second direction under the drive of the push rod seat.

[0028] To achieve the above-mentioned object, the present invention further provides a hydraulic lifting device, comprising a hydraulic lifter and a tensioning mechanism of any one of the hydraulic lifting devices, wherein the tensioning mechanism is arranged on the top of the hydraulic lifter.

[0029] Optionally, the hydraulic lifter includes a second hydraulic cylinder for driving the load and multiple fixed rods for supporting the tensioning mechanism; the driving device includes the second hydraulic cylinder; one end of all the fixed rods is connected to the second hydraulic cylinder, and the other end is connected to the tensioning mechanism.

[0030] Optionally, the hydraulic lifting equipment further includes a second limiting member, which is detachably connected to at least a portion of the fixing rod to fix the position of the limiting device.

[0031] In summary, the hydraulic lifting equipment and its tensioning mechanism provided by the present invention include: a fixedly connected hydraulic lifter and a tensioning mechanism, wherein the tensioning mechanism is arranged on the top of the hydraulic lifter. The tensioning mechanism includes a driving device, a clamping device and a limiting device, wherein the clamping device includes a first clamping part and a second clamping part, the driving device is connected to the first clamping part and is used to drive the first clamping part to move relative to the second clamping part; the limiting device is connected to the second clamping part to limit the position of the second clamping part; the tensioning mechanism is configured so that when the driving device drives the first clamping part to move in a first vertical direction, the second clamping part can clamp the traction body; the tensioning mechanism is also configured so that when the driving device drives the first clamping part to move in a second vertical direction, the second clamping part can release the traction body; the tensioning mechanism is also configured so that after the clamping device clamps the traction body, the driving device can drive the clamping device and the limiting device to move together in the first direction to tension the traction body; the first direction is opposite to the second direction. With such configuration, the driving device and the limiting device can cooperate with each other to enable the clamping device to clamp or release each traction body, and after clamping each traction body, the clamping device, the limiting device and each traction body can be moved in the first direction under the drive of the driving device, so that the clamped traction bodies can be successively tensioned during the movement, and the tightness of each traction body can be basically consistent and can be basically evenly stressed when lifting the load. In this way, it can be ensured that each traction body can lift the load together, and the safety and reliability of the hydraulic lifting equipment during operation can be guaranteed, and the debugging time of the hydraulic lifting equipment can be saved to a great extent, effectively improving the operating efficiency of the hydraulic lifting equipment in the preparation stage, and filling the gap in the field of automatic tensioning technology of traction bodies.

[0032] The inner surface roughness Ra and the outer surface roughness Ra of the second clamping part in the hydraulic lifting equipment provided by the present invention are both less than or equal to 1.6um; and the Rockwell hardness HRA of the inner surface and the Rockwell hardness HRA of the outer surface of the second clamping part are both greater than 80. In this way, after part of the traction body is tensioned, the tensioned traction body can slide relative to the corresponding second clamping part, and then the traction bodies that are successively stretched and tensioned will also slip successively after tensioning, thereby achieving consistent tightness of all traction bodies and being able to bear uniform force when lifting heavy objects, further ensuring the safety of the hydraulic lifting equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 A schematic structural diagram of a tensioning mechanism in a hydraulic lifting device in a preferred embodiment of the present invention;

[0034] Figure 2a A top view of the second clamping portion in a preferred embodiment of the present invention;

[0035] Figure 2b It is a cross-sectional view along line AA in FIG2 ;

[0036] Figure 3 This is a structural schematic diagram of a clamping device of a tensioning mechanism in a preferred embodiment of the present invention clamping a traction body and tensioning the body to an upper limit position;

[0037] Figure 4 This is a schematic structural diagram of a preferred embodiment of the present invention when the clamping device of the tensioning mechanism releases the traction body and returns to the lower limit position;

[0038] Figure 5 for Figure 4 A partial enlarged view of part B;

[0039] Figure 6 This is a structural diagram of an anchor plate in a preferred embodiment of the present invention;

[0040] Figure 7 This is a schematic diagram of the construction application structure of the hydraulic lifting equipment in a preferred embodiment of the present invention.

[0041] The following are the descriptions of the reference numerals:

[0042] Tensioning mechanism 1; first clamping portion 11; limiting tapered hole 111; second clamping portion 12; pipe segment 121; first through hole 122; groove 123; protrusion 124; anchor plate 13; anchor plate 14; stepped hole 141; first hydraulic cylinder 15; piston rod of first hydraulic cylinder 151; upper chamber 152; lower chamber 153; release traction device 16; first limiting member 161; first stopper 162; thrust assembly 17; first push rod 171; second push rod 172; push rod seat 173; second stopper 174; guide plate 18;

[0043] Tractor 2; second hydraulic cylinder 3; piston rod 31 of the second hydraulic cylinder; fixing rod 32; positioning hole 321; first anchor locking mechanism 4; first anchor plate 41; second anchor locking mechanism 5; third anchor locking mechanism 6; weight 7; lifter support mechanism 8. DETAILED DESCRIPTION

[0044] 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.

[0045] 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.

[0046] 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.

[0047] 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.

[0048] like Figure 1As shown, the present invention provides a tensioning mechanism 1 of a hydraulic lifting equipment (hereinafter referred to as tensioning mechanism 1), which is used to tension multiple traction bodies 2, and includes a driving device, a clamping device and a limiting device; the clamping device includes a first clamping part 11 and multiple second clamping parts 12 arranged opposite to each other; the driving device is connected to the first clamping part 11, and is used to drive the first clamping part 11 to move relative to the second clamping part 12; the limiting device is connected to the second clamping part 12 to limit the position of the second clamping part 12. The tensioning mechanism 1 is configured such that, when the driving device drives the first clamping portion 11 to move along the first direction a, each second clamping portion 12 can clamp a corresponding traction body 2; the tensioning mechanism 1 is further configured such that, when the driving device drives the first clamping portion 11 to move in the second direction b, each second clamping portion 12 can release a corresponding traction body 2; the tensioning mechanism 1 is further configured such that, after the clamping device clamps the traction body 2, the driving device can drive the clamping device and the limiting device to move together along the first direction a to tension all the traction bodies 2 respectively, and the first direction a and the second direction b are opposite. Specifically, before the second clamping portion 12 clamps the traction body 2, the second clamping portion 12 remains in its original position under the limitation of the limiting device; after the second clamping portion 12 clamps the traction body 2, the driving device drives the first clamping portion 11 along the first direction a to drive the second clamping portion 12, the traction body 2, and the driving device to move. 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. It should be understood that in this application, the second clamping portion 12 clamping the traction body 2 means that the second clamping portion 12 can clamp the traction body 2 and can drive the traction body 2 to move in the first direction a or the second direction b.

[0049] With such configuration, the driving device and the limiting device can cooperate with each other to enable the clamping device to clamp or release the traction body 2, and after clamping the traction body, the clamping device, the limiting device and the traction body 2 can be moved in the first direction a under the drive of the driving device, so that the clamped traction body 2 can be tensioned during the movement, and when multiple traction bodies 2 are clamped at the same time, the tightness of each traction body 2 can be basically consistent and each traction body 2 can be basically uniformly stressed when lifting a heavy object 7. In this way, it can be ensured that each traction body 2 can lift the heavy object 7 together, ensuring the safety and reliability of the hydraulic lifting equipment during operation, and can also save the debugging time of the hydraulic lifting equipment to a large extent, effectively improve the operating efficiency of the hydraulic lifting equipment, and fill the gap in the field of automatic tensioning technology of traction bodies.

[0050] It should be understood that the present application does not limit the type of the traction body 2. The traction body 2 only needs to be able to drive the heavy object 7 to rise or fall. That is, the traction body 2 includes but is not limited to a steel strand.

[0051] like Figure 7As shown, the present invention further provides a hydraulic lifting device, which includes a fixedly connected hydraulic lifter and a tensioning mechanism 1, wherein the tensioning mechanism 1 is disposed on top of the hydraulic lifter. The present invention can tension all traction bodies 2 before the hydraulic lifter lifts a weight 7 by disposing the tensioning mechanism 1 on top of the hydraulic lifter, so that all traction bodies 2 can jointly lift the weight 7, thereby avoiding safety accidents that may occur when only partially tensioned traction bodies 2 are used to lift the weight 7, and ensuring the safety and reliability of the hydraulic lifting device during operation.

[0052] Reference Figure 4 and Figure 5 As shown, in a preferred embodiment, the first clamping portion 11 and the limiting device are arranged parallel to each other, and a limiting tapered hole 111 is provided on the first clamping portion 11. The tensioning mechanism 1 is configured such that when the driving device drives the first clamping portion 11 to move in the first direction a, the second clamping portion 12 is held stationary by the limiting device, causing the first clamping portion 11 to move relative to the second clamping portion 12, thereby forcing at least a portion of the second clamping portion 12 to enter the limiting tapered hole 111 until the second clamping portion 12 clamps the traction body 2. Simultaneously, the tensioning mechanism 1 is further configured such that when the driving device drives the first clamping portion 11 to move in the second direction b, the second clamping portion 12 is held stationary by the limiting device, causing the first clamping portion 11 to move relative to the second clamping portion 12, thereby forcing at least a portion of the second clamping portion 12 to disengage the limiting tapered hole 111 until the second clamping portion 12 releases the traction body 2. With such an arrangement, the driving device can drive the first clamping part 11 to move, and the limiting device can limit the movement of the second clamping part 12 so that the second clamping part 12 clamps the traction body 2; and when the second clamping part 12 clamps the traction body 2, since the clamping device and the limiting device are connected to form a whole, the first clamping part 11, the second clamping part 12 and the limiting device can move upward together with the driving device, so that the traction body 2 whose pre-tensioned part has been relaxed can reach a tensioned state one after another after several reciprocating movements of the pre-tensioned part.

[0053] Furthermore, the first clamping portion 11 and the limiting device are both flat plates, the number of limiting tapered holes 111 is multiple, the number of second clamping portions 12 corresponds to the number of limiting tapered holes 111, and each second clamping portion 12 is used to clamp one traction body 2. Preferably, the multiple second clamping portions 12 have the same shape and size. With this arrangement, when the first clamping portion 11 and the limiting device approach each other, all second clamping portions 12 connected to the limiting device can simultaneously enter the corresponding limiting tapered holes 111, thereby ensuring that all traction bodies 2 can be clamped or released synchronously, allowing the tensioning mechanism 1 to effectively tension each traction body 2, thereby ensuring that all traction bodies 2 can jointly lift the heavy object 7 during the working phase of the hydraulic lifting equipment.

[0054] Reference Figure 2a and Figure 2b As shown, combined with Figure 5 In a non-limiting embodiment, the second clamping portion 12 is a hollow truncated cone-shaped structure formed by splicing at least two segments 121. A gap exists between any two segments 121 in the second clamping portion 12 after the traction body 2 is inserted. The outer diameter of the second clamping portion 12 gradually increases from one end to the other along the first direction a, that is, the outer diameter of the end surface of the second clamping portion 12 that cooperates with the limiting device is greater than the outer diameter of the end surface of the end that cooperates with the first clamping portion 11. The shape of the limiting tapered hole 111 matches the outer surface shape of the second clamping portion 12, that is, the shape of the limiting tapered hole 111 is also truncated cone-shaped. Preferably, the vertical height of the limiting tapered hole 111 is less than the vertical height of the second clamping portion 12. When the second clamping portion 12 enters the limiting through-hole 111, the gap between any adjacent segments 121 in the second clamping portion 12 gradually decreases until the second clamping portion 12 clamps the traction body 2. In this way, when the driving device drives the first clamping part 11 to move in the first direction a, the second clamping part 12 remains stationary under the limiting action of the limiting device, and the second clamping part 12 can gradually enter the limiting tapered hole 111 and gradually limit the outer diameter of the end face of the second clamping part 12, thereby realizing the gradual clamping of the traction body 2 by the second clamping part 12.

[0055] In this embodiment, the second clamping portion 12 is a hollow truncated cone-shaped structure formed by splicing three tube segments 121. A first through hole 122 is provided between the three tube segments 121, and the traction body 2 is placed in the first through hole 122. The three tube segments 121 preferably have the same size. The three tube segments 121 are all connected to a limiting device, and when the three tube segments 121 are spliced ​​into the second clamping portion 12, there is a gap between two adjacent tube segments 121. When the second clamping portion 12 gradually enters the limiting tapered hole 111 of the first clamping portion 11, the gaps between the three tube segments 121 of the second clamping portion 12 gradually decrease, that is, the inner diameters of the first through holes 122 gradually decrease. When any two adjacent tube segments 121 of the second clamping portion 12 are in contact with each other, the inner diameters of the first through holes 122 reach a minimum value. When the second clamping portion 12 gradually enters the limiting tapered hole 111 , when the inner diameter of the first through hole 122 is smaller than or equal to the outer diameter of the traction body 2 , the second clamping portion 12 can clamp the traction body 2 and drive the traction body 2 to move synchronously.

[0056] More specifically, the inner surface roughness Ra and the outer surface roughness Ra of the second clamping portion 12 are both less than or equal to 1.6 μm; and the Rockwell hardness HRA of the inner surface and the Rockwell hardness HRA of the outer surface of the second clamping portion 12 are both greater than 80; the tensioning mechanism 1 is also configured so that when a portion of the traction body 2 is tensioned, the tensioned traction body 2 can slide relative to the second clamping portion 12. In this embodiment, the smoothness of the inner and outer surfaces of the second clamping portion 12 is relatively high. With this configuration, when the axial tension applied to a certain traction body 2 is greater than the clamping force of the second clamping portion 12, slippage will occur between the traction body 2 and the second clamping portion 12 (i.e., at this time, the traction body 2 does not move while the corresponding second clamping portion 12 can continue to move upward following the driving device), so that the traction body 2 can move relative to the second clamping portion 12.

[0057] In a non-limiting embodiment, the clamping and tensioning process of the traction body 2 is as follows:

[0058] As the second clamping portion 12 gradually enters the limiting tapered hole 111, any two adjacent segments 121 of the second clamping portion 12 gradually approach each other, and the inner diameter of the first through hole 122 gradually decreases. When the inner diameter of the first through hole 122 is less than or equal to the outer diameter of the traction body 2, the second clamping portion 12 is able to clamp the corresponding traction body 2 and drive the traction body 2 to move synchronously with the first clamping portion 11. Because the traction bodies 2 have different degrees of slack before tensioning, the order in which the traction bodies 2 with different degrees of slack are tensioned differs when all the traction bodies 2 are simultaneously clamped and moved synchronously. When the second clamping portion 12 drives the already tensioned traction body 2 to continue moving, the clamping force of the second clamping portion 12 on the tensioned traction body 2 may be less than the axial tension applied to the traction body 2. In this case, the tensioned traction body 2 may slip at the corresponding clamping position of the second clamping portion 12. Subsequently, the subsequent tensioned traction bodies 2 may also slip after tensioning. When the driving device moves to the extreme position, each traction body 2 that has been tensioned and slipping changes from a relaxed state to a tensioned state, so that the tensioning mechanism 1 completes the tensioning of each traction body 2. If some traction bodies 2 still do not slip after the driving device moves to the upper limit position, that is, some traction bodies 2 fail to reach the tensioned state, it is only necessary to maintain the position of the traction body 2 and restore the driving device to the initial state. Then, the tensioning process described above is repeated once or multiple times for each traction body 2, so that all traction bodies 2 are in the tensioned state, thereby achieving uniform tension for all traction bodies 2 and being able to receive uniform force when lifting the heavy object 7.

[0059] It should be understood that when the second clamping portion 12 in the present application is a hollow conical structure, the inclination angle of the outer surface of the second clamping portion 12 (that is, the angle between the outer surface of the second clamping portion 12 and the vertical direction) should be the same as the inclination angle of the limiting conical hole 111, so that the second clamping portion 12 can gradually enter the limiting conical hole 111 to clamp the traction body 2. Preferably, the inclination angle of the outer surface of the second clamping part 12 is 7.0°~9.0°, so that the inclination angle of the outer surface of the second clamping part 12 is slightly larger than the self-locking angle formed by the mutual friction between the second clamping part 12 and the first clamping part 11. On the one hand, the second clamping part 12 and the first clamping part 11 will not form a self-locking structure when they approach each other, thereby facilitating the contact and disengagement of the first clamping part 11 and the second clamping part 12, and further facilitating the clamping or release of the traction body 2 by the second clamping part 12; on the other hand, since the first clamping part 11 and the second clamping part 12 cannot form self-locking, the limiting device needs to apply a limiting force to the second clamping part 12 so that the second clamping part 12 can gradually clamp the traction body 2, and when the axial force of the external load on the traction body 2 is greater than the clamping force of the second clamping part 12, slippage will occur between the traction body 2 and the second clamping part 12. When the inclination angle of the outer surface of the second clamping part 12 is close to 7.0°, the limiting device only needs a small limiting force when limiting the second clamping part 12, so that the second clamping part 12 can enter the first clamping part 11 and form a larger clamping force on the traction body 2, thereby more firmly clamping the traction body 2 and only requiring the limiting device to provide a smaller limiting force, thereby reducing the size of the first hydraulic cylinder 15 and the limiting device, and reducing the manufacturing cost of the tensioning mechanism.

[0060] In addition, when the inclination angle of the outer surface of the second clamping portion 12 is greater than 9.0°, since the spacing between each traction body 2 is a certain value when each traction body 2 drives the load to lift, and since the maximum inner diameter of the limiting cone hole 111 of the first clamping portion 11 and the maximum outer diameter of the second clamping portion 12 are both larger at this time, the limiting cone holes 111 corresponding to adjacent traction bodies 2 may partially overlap, and interference may also occur between the second clamping portions 12 corresponding to adjacent traction bodies 2. In this way, the second clamping portions 12 corresponding to each traction body 2 cannot synchronously enter the corresponding limiting cone holes 111 and clamp the traction body 2, so the inclination angle of the outer surface of the second clamping portion 12 needs to be between 7.0° and 9.0°.

[0061] Continue to refer to Figure 1As shown, in a preferred embodiment, the limiting device includes a pressure anchor plate 13, which is arranged parallel to the first clamping part 11 in the vertical direction, and one end of the second clamping part 12 is used to be inserted into the limiting cone hole 111 of the first clamping part 11, and the other end is preferably detachably connected to the pressure anchor plate 13. In one embodiment, the pressure anchor plate 13 is arranged above the first clamping part 11. Furthermore, a second through hole (unnumbered) for the traction body 2 to pass through is provided on the pressure anchor plate 13. When the traction body 2 is installed, the traction body 2 can be made to pass through the limiting cone hole 111 of the first clamping part 11, the first through hole 122 of the second clamping part 12 and the second through hole on the pressure anchor plate 13 in sequence, thereby completing the installation of the traction body 2 on the tensioning mechanism 1.

[0062] Reference Figures 4 to 6 As shown, in a specific embodiment, the limiting device also includes an anchoring plate 14 for connecting the pressure anchor plate 13 and the second clamping portion 12, and the anchoring plate 14 is connected to the pressure anchor plate 13 and the second clamping portion 12 respectively. In this embodiment, the anchoring plate 14 is arranged between the second clamping portion 12 and the pressure anchor plate 13, and a stepped hole 141 is provided on the anchoring plate 14. The inner diameter of the stepped hole 141 on the side close to the pressure anchor plate 13 is larger than the inner diameter of the stepped hole 141 on the side away from the pressure anchor plate 13. The second clamping portion 12 is provided with a protrusion 124 that cooperates with the stepped hole 141, and an annular groove 123 is provided below the protrusion 124. When the second clamping portion 12 is installed, the protrusion 124 of the second clamping portion 12 can be placed in the stepped hole 141 of the anchoring plate 14, so that the second clamping portion 12 is fixedly connected to the anchoring plate 14. In addition, an elastic ring may be placed in the groove 123 of the second clamping portion 12 so that the three pipe segments 121 of the second clamping portion 12 are connected as a whole and can clamp or release the traction body 2 .

[0063] In a preferred embodiment, the second protrusion 123 has a gap when cooperating with the stepped hole 141, and the first protrusion 142 also has a gap when cooperating with the groove 124. In this way, the anchor plate 14 cannot interfere with the movement of the three pipe segments 121 in the second clamping portion 12 in the radial direction and the axial direction of the second clamping portion 12. At this time, the three pipe segments 121 of the second clamping portion 12 can move freely during the process of clamping or releasing the traction body 2, thereby ensuring the flexibility and reliability of the second clamping portion 12 in clamping or releasing the traction body 2.

[0064] Reference Figure 1As shown, the tensioning mechanism 1 also includes a support device connected to the limit device. In this embodiment, the support device is arranged above the limit device. In other embodiments, the support device can be arranged below the limit device. The support device is configured as follows: before clamping the traction body 2, the support device is used to fix the position of the limit device; after clamping the traction body 2, the drive device is used to drive the clamping device, the limit device and part of the support device to move together along the first direction a; after tensioning the traction body 2, the support device is used to fix the position of the limit device so that when the drive device drives the first clamping part 11 to move along the second direction b, the second clamping part 12 can be separated from the first clamping part 11 and release the traction body 2. It should be understood that the support device in this application can only move some parts under the drive of the limit device, and cannot move on its own.

[0065] Reference Figure 3 and Figure 4 As shown, in a preferred embodiment, the support device includes a double-acting, double-rod, uniform-cross-section first hydraulic cylinder 15. One end of each piston rod 151 in the first hydraulic cylinder is connected to a stopper. It should be understood that the piston rod 151 of the first hydraulic cylinder in this application refers to the lower piston rod of the first hydraulic cylinder 15.

[0066] In this embodiment, the piston rod 151 of the first hydraulic cylinder, the anchor plate 13, and the anchoring plate 14 are detachably connected and serve to secure the position of the second clamping portion 12 when the drive device drives the first clamping portion 11 to move in the first direction a. In this embodiment, the end of the piston rod 151 of the first hydraulic cylinder is provided with a step of smaller diameter, and the end of the step is provided with a thread. The anchor plate 13 is provided with a limiting hole that can be sleeved on the outside of the step, and the outer diameter of the limiting hole is smaller than the outer diameter of the piston rod 151 of the first hydraulic cylinder. The anchoring plate 14 is also provided with a third through hole for the piston rod 151 of the first hydraulic cylinder to pass through. The piston rod 151 of the first hydraulic cylinder is used to pass through the limiting hole and the third through hole of the anchor plate 13 and then be threadedly connected to a nut, thereby connecting the anchor plate 13, the anchoring plate 14, and the first hydraulic cylinder 15. Of course, the connection method of the anchor plate 13, the anchoring plate 14, and the first hydraulic cylinder 15 is not limited to a threaded connection. In other embodiments, the anchor plate 13, the anchor plate 14, and the first hydraulic cylinder 15 may also be connected by other mechanical connection methods (e.g., a snap connection method). It should be understood that the "double-acting, double-rod, uniform-cross-section first hydraulic cylinder 15" herein refers to a hydraulic cylinder known to those skilled in the art having two piston rods capable of bidirectional movement, and having an upper chamber and a lower chamber of equal area.

[0067] Furthermore, all piston rods 151 in the first hydraulic cylinder 15 are connected to the limiting device, and all piston rods 151 in the first hydraulic cylinder 15 move synchronously. The chamber areas of all first hydraulic cylinders 15 are the same, and all upper chambers 152 of all first hydraulic cylinders 15 are connected in parallel, and all lower chambers 153 of all first hydraulic cylinders 15 are connected in parallel. This allows the piston rods 151 of multiple first hydraulic cylinders to move synchronously when the cylinders are extended or retracted, ensuring that the anchor plate 13 can always be parallel to the first clamping part 11 when moving, and allowing the multiple second clamping parts 12 to clamp and release the traction body 2 at the same time, thereby ensuring the normal operation of the tensioning mechanism 1.

[0068] Reference Figure 3 and Figure 4 As shown, in this embodiment, the first hydraulic cylinder 15 is a hydraulic resistor, which includes an upper chamber 152 and a lower chamber 153. The upper chamber 152 and the lower chamber 153 are respectively connected to the two ends of the one-way overflow valve (or speed control valve). The one-way overflow valve in the hydraulic resistor can only be turned into an open state when the piston rod 151 of the first hydraulic cylinder is subjected to a certain pressure. Once the overflow valve is opened, the clamping device and the limiting device can always be subjected to constant pressure from the supporting device when they move together along the first direction a. Before the overflow valve is opened, the position of the limiting device can be fixed by the supporting device, so that the second clamping part 12 can clamp the traction body 2. With such an arrangement, after the upper chamber 152 and the lower chamber 153 of the hydraulic resistor are filled with hydraulic oil, when the piston rod 151 of the first hydraulic cylinder needs to be able to move in the first direction a, the pressure in the upper chamber of the hydraulic resistor needs to exceed the overflow opening pressure of the one-way overflow valve to realize the internal circulation of the hydraulic oil in the hydraulic resistor; and when the piston rod 151 of the first hydraulic cylinder needs to be able to move in the second direction b, the lower chamber of the hydraulic resistor only needs a smaller pressure to open the one-way valve to realize the internal circulation. In summary, the movement process of the piston rod 151 of the first hydraulic cylinder does not require external oil supply, thereby simplifying the structure of the tensioning mechanism 1 and improving the working efficiency of the tensioning mechanism 1. It should be noted that, in order to reduce the resistance to the return stroke of the anchor plate 13, the piston rod 151 of the first hydraulic cylinder can be configured to automatically open the one-way valve in the one-way relief valve when the cylinder is extended, so that the hydraulic oil in the lower chamber 153 of the first hydraulic cylinder 15 can quickly enter the upper chamber 152, thereby ensuring that the first hydraulic cylinder 15 has only a small resistance when the anchor plate 13 is returned, thereby reducing the energy consumption of the second hydraulic cylinder 3 when the cylinder is retracted and the load on the tensioned components of the tensioning mechanism 1. It should be understood that in this application, the state of the first hydraulic cylinder 15 when moving in the second direction b is the extended state, and the state of the first hydraulic cylinder 15 when moving in the first direction a is the retracted state; and the state of the second hydraulic cylinder 3 when moving in the first direction a is the extended state, and the state of the second hydraulic cylinder 3 when moving in the second direction b is the retracted state.

[0069] Preferably, the tensioning mechanism 1 further includes a release traction device 16 connected to the limiting device and the first clamping portion 11, respectively. After the traction body 2 is released, the driving device is used to drive the first clamping portion 11 to move the release traction device 16 and the limiting device in the second direction b, so that the release traction device 16 drives part of the support device to move in the second direction b.

[0070] Reference Figure 1 As shown, as a preferred embodiment, the release traction device 16 includes a first limiting member 161 and a first stop member 162, and the limiting device is provided with a receiving hole for the first limiting member 161 to pass through, one end of the first limiting member 161 is used to be connected to the first clamping portion 11, and the other end is used to pass through the receiving hole and then connect to the first stop member 162; the first stop member 162 is used to abut against the limiting device to pull the limiting device to move along the second direction b together with the release traction device 16. In this embodiment, the accommodating hole is provided on the anchor plate 13. In this way, when the piston rod 31 of the second hydraulic cylinder contracts and drives the first clamping part 11 to move in the second direction b, the first stop member 162 can abut against the anchor plate 13 and provide a tensile force to the anchor plate 13, so that the anchor plate 13 can move synchronously with the first clamping part 11 under the drive of the first stop member 162, and can enable the first clamping part 11, the second clamping part 12 and the anchor plate 13 to move to the initial position (that is, the position of the first clamping part 11, the second clamping part 12 and the anchor plate 13 before the driving device moves), so as to facilitate the tensioning mechanism 1 to re-tighten the traction body 2.

[0071] In a non-limiting embodiment, the tensioning and releasing process of the traction body 2 may also be:

[0072] Reference Figure 3 As shown, before clamping the traction body 2, the piston rod 31 of the second hydraulic cylinder extends and drives the first clamping part 11 to move in the first direction a, and the supporting device is used to apply pressure in the second direction b to the anchor plate 13 to fix all the second clamping parts 12 in their original positions. At this time, all the first clamping parts 11 move upward synchronously, and all the second clamping parts 12 gradually enter the corresponding limiting tapered holes 111, so that all the second clamping parts 12 clamp the traction body 2 synchronously.

[0073] After clamping the traction body 2, the piston rod 31 of the second hydraulic cylinder continues to extend and drives the anchor plate 13 to move in the first direction a. The anchor plate 13 applies pressure to the piston rod 151 of the first hydraulic cylinder. When the pressure on the piston rod 151 of the first hydraulic cylinder reaches a certain value, the one-way relief valve outside the first hydraulic cylinder 15 opens, allowing the hydraulic oil in the upper chamber 152 of the first hydraulic cylinder 15 to gradually enter the lower chamber 153. Driven by the second hydraulic cylinder 3, the piston rod 151 of the first hydraulic cylinder gradually retracts, and the first clamping part 11, the second clamping part 12, the anchor plate 13, and the anchor plate 14 all move in the first direction a along with the second hydraulic cylinder 3. The first stopper 162 separates from the anchor plate 13. During the synchronous ascent of all second clamping parts 12, all traction bodies 2 are successively tensioned, so that the tension of all traction bodies 2 is basically the same, thereby enabling all traction bodies 2 to lift the heavy object 7 together.

[0074] Reference Figure 4 and Figure 5 As shown, after the traction body 2 is tensioned, the piston rod 31 of the second hydraulic cylinder contracts and drives the first clamping part 11 to move in the second direction b, and the anchor plate 13, the anchor plate 14 and the second clamping part 12 are fixed in the existing position by the pulling force of the first hydraulic cylinder 151. At this time, the first clamping part 11 and the second clamping part 12 gradually separate, and the second clamping part 12 releases the traction body 2.

[0075] After releasing the traction body 2, the piston rod 31 of the second hydraulic cylinder continues to retract, and the first clamping part 11 continues to move in the second direction b under the drive of the second hydraulic cylinder 3, and the anchor plate 13 abuts against the first stop 162. Then, the second hydraulic cylinder 3 continues to drive the first clamping part 11 to move in the second direction b, and the first clamping part 11 drives the release traction device 16 to move. The first stop 162 in the release traction device 16 drives the anchor plate 13 and the second clamping part 12 to move. The anchor plate 13 drives the piston rod 151 of the first hydraulic cylinder to gradually extend, so that the first clamping part 11, the second clamping part 12 and the limit device return to their initial positions (i.e., the positions of the first clamping part 11, the second clamping part 12 and the limit device before the piston rod 31 of the second hydraulic cylinder is extended). It should be noted that when all the traction bodies 2 are fully tensioned during the sequential extension of the piston rod 31 of the second hydraulic cylinder, the tensioning mechanism 1 can be shut down, even if the first clamping part 11, the second clamping part 12 and the limiting device in the tensioning mechanism 1 no longer move with the retraction of the piston rod 31 of the second hydraulic cylinder, thereby starting the hydraulic lifter to lift the heavy object 7.

[0076] It should be understood that the first hydraulic cylinder 151 can control the clamping force of the second clamping portion 12 on the traction body 2 by adjusting the overflow opening pressure within the internal one-way overflow valve, so that the traction body 2 can be clamped and tensioned. It should also be understood that the clamping force of the second clamping portion 12 on the traction body 2 should not be too large or too small. Specifically, if the clamping force of the second clamping portion 12 on the traction body 2 is too large, it may cause the traction body 2 to be difficult to slip at the position of the second clamping portion 12 after tensioning, which may cause damage to the tensioning mechanism 1; if the clamping force of the second clamping portion 12 on the traction body 2 is too small, the traction body 2 may slip at the position of the second clamping portion 12 before it is in the tensioned state, thereby preventing the second clamping portion 12 from driving the traction body 2 to rise synchronously, thereby causing the tensioning mechanism 1 to fail to tension the traction body 2.

[0077] Reference Figure 1 As shown, the tensioning mechanism 1 further includes a thrust assembly 17 connected to the first clamping portion 11 and the driving device respectively, and the thrust assembly 17 is used to drive the first clamping portion 11 to move under the drive of the driving device.

[0078] In some embodiments, the thrust assembly 17 includes a first push rod 171, a second push rod 172, a push rod seat 173 and a second stop member 174. The first push rod 171 and the second push rod 172 are fixedly connected. The first push rod 171 is connected to the first clamping portion 11, and the second push rod 172 is connected to the second stop member 174. The outer diameter of the first push rod 171 is greater than the outer diameter of the second push rod 172.

[0079] Reference Figure 1 As shown, in this embodiment, the push rod seat 173 is sleeved on the second push rod 172 and can slide relative to the second push rod 172 under the drive of the driving device. The first push rod 171 is used to drive the first clamping portion 11 to move in the first direction a under the drive of the push rod seat 173, and the second stopper 174 is used to drive the first clamping portion 11 to move in the second direction b under the drive of the push rod seat 173. In other embodiments, the thrust assembly 17 can also be configured as a connecting rod connecting the second hydraulic cylinder 3 and the first clamping portion 11, and the connecting rod can be used to transmit the movement of the second hydraulic cylinder 3 to the first clamping portion 11. Therefore, this application does not limit the structure of the thrust assembly 17.

[0080] In more detail, the push rod seat 173 is connected to the piston rod 31 of the second hydraulic cylinder. A fourth through hole is provided on the push rod seat 173 for the second push rod 172 to pass through. One end of the first push rod 171 is connected to the first clamping part 11, and the other end passes through the fourth through hole and is connected to the second stop member 174. In this way, the piston rod 31 of the second hydraulic cylinder can drive the first clamping part 11 to move through the thrust assembly 17.

[0081] Furthermore, in this embodiment, the end of the second push rod 172 is provided with a thread, and the second stopper 174 is a nut. The second push rod 172 can be threadedly connected to the second stopper 174 to limit the movement distance of the push rod seat 173 relative to the second push rod 172. Of course, in other embodiments, the second push rod 172 and the second stopper 174 can also be connected using other mechanical connection methods.

[0082] Furthermore, when there are multiple push rod seats 173, the multiple push rod seats 173 are all connected to the piston rod 31 of the second hydraulic cylinder. With such an arrangement, the multiple push rod seats 173 can be moved synchronously when the piston rod 31 of the second hydraulic cylinder extends or retracts, thereby preventing the first clamping part 11 from tilting during movement and ensuring that all traction bodies 2 can be clamped synchronously.

[0083] In one embodiment, the moving stroke of the first push rod 171 is smaller than the stroke of the piston rod 151 in the first hydraulic cylinder, so that the first hydraulic cylinder 15 can always follow the movement of the first push rod 171 during the movement of the first push rod 171. It can also prevent the second hydraulic cylinder 3 driving the first push rod 171 from damaging the first hydraulic cylinder 15 when the cylinder is extended to the upper limit position or from pulling the first hydraulic cylinder 15 when the cylinder is retracted to the lower limit position.

[0084] In a non-limiting embodiment, the working process of the thrust assembly 17 is:

[0085] When the piston rod 31 of the second hydraulic cylinder begins to extend, the push rod seat 173 slides in the first direction a driven by the second hydraulic cylinder 3. Before the push rod seat 173 abuts against the first push rod 171, the first clamping portion 11 does not move; Figure 3 As shown, after the push rod seat 173 abuts against the first push rod 171, as the piston rod 31 of the second hydraulic cylinder continues to extend, the push rod seat 173 can push the first push rod 171 and the first clamping portion 11 to move in the first direction a, so that the second clamping portion 12 clamps and tensions the traction body 2;

[0086] When the piston rod 31 of the second hydraulic cylinder begins to retract, the push rod seat 173 slides in the second direction b driven by the second hydraulic cylinder 3. At the moment when the push rod seat 173 is disengaged from the first push rod 171, the second clamping part 12 will push the first clamping part 11 to move slightly in the second direction b under the action of the residual pressure of the first hydraulic cylinder 15, and the second clamping part 12 releases the traction body 2; Figure 1As shown, after the push rod seat 173 is abutted against the second stop member 174, as the piston rod 31 of the second hydraulic cylinder continues to retract, the second stop member 174 can drive the first clamping part 11 and the release traction device 16 to move in the second direction b, and the release traction device 16 drives the pressure anchor plate 13 and the anchor lifting plate 14 to move in the second direction b, so that the first clamping part 11, the second clamping part 12 and the pressure anchor plate 13 are moved to the initial position, thereby facilitating the tensioning mechanism 1 to tension the traction body 2 again.

[0087] Reference Figure 7 As shown, the second hydraulic cylinder 3 is provided on the hydraulic lifter and is used to drive the weight 7 to lift. In this embodiment, the driving device of the tensioning mechanism 1 is the second hydraulic cylinder 3, and the piston rod 31 of the second hydraulic cylinder is connected to the first clamping part 11 to drive the first clamping part 11 to move. Of course, in other embodiments, the driving device of the tensioning mechanism 1 can also be an externally configured hydraulic cylinder. In addition, the present application does not limit the type of driving device, that is, it does not limit the driving device to be implemented by a hydraulic cylinder. The driving device only needs to be able to drive the first clamping part 11 to move in the first direction a.

[0088] Reference Figures 3 to 5 As shown, the hydraulic lifter further includes a plurality of fixing rods 32 for supporting the tensioning mechanism 1 , one end of all the fixing rods 32 is connected to the piston rod 31 of the second hydraulic cylinder, and the other end is connected to the tensioning mechanism 1 .

[0089] In some embodiments, the number of fixing rods 32 is even, and all fixing rods 32 are evenly arranged around the vertical axis. The first clamping portion 11 is provided with a fifth through-hole for the fixing rods 32 to pass through, thereby ensuring that the first clamping portion 11 can always move in the vertical direction without rotating. Furthermore, the pressure anchor plate 13 may be provided with a sixth through-hole for the fixing rods 32 to pass through, thereby ensuring that the pressure anchor plate 13 does not rotate when moving.

[0090] In this embodiment, the fixing rod 32 passes through the fifth through hole on the first clamping portion 11 and the sixth through hole on the pressure anchor plate 13, so that the first clamping portion 11 and the pressure anchor plate 13 always move in the extension direction of the fixing rod 32 (that is, always move in the vertical direction), and the first clamping portion 11 and the pressure anchor plate 13 can always remain parallel during movement and do not rotate.

[0091] Furthermore, the hydraulic lifting equipment also includes a second limiting member (unnumbered), which is detachably connected to at least part of the fixed rod 32 to fix the position of the limiting device. In this embodiment, there are two fixed rods 32, which are symmetrically arranged at both ends of the pressure anchor plate 13 and the first clamping part 11, and positioning holes 321 are symmetrically arranged on the two fixed rods 32. The second limiting member is preferably a pin that can be inserted into the positioning hole 321 of the fixed rod 32. After the second limiting member is inserted into the symmetrically arranged positioning hole 321, the pressure anchor plate 13 can be placed on the two symmetrically arranged second limiting members to fix the position of the pressure anchor plate 13 and the second clamping part 12, and the first clamping part 11 is disengaged from the second clamping part 12 when it is not driven by the driving device. At this time, the second clamping part 12 releases the traction body 2, and the tensioning mechanism 1 exits work.

[0092] Specifically, in this embodiment, after all traction bodies 2 are tensioned, the second limiting member can be inserted into the symmetrically arranged positioning hole 321, and the second stopper 174 at the end of the second push rod 172 can be removed, thereby deactivating the tensioning mechanism 1. Since the first push rod 171 is now restricted to a certain height, when the second hydraulic cylinder 3 lifts the weight 7, the push rod seat 173, which moves synchronously with the second hydraulic cylinder 3, does not contact the first fixing member 171 during movement. Furthermore, when the second hydraulic cylinder 3 lifts the weight 7, the second clamping portion 12 can release the traction body 2, thereby deactivating the tensioning mechanism 1 without interfering with the hydraulic lifter's lifting of the weight 7, thereby ensuring smooth lifting of the weight 7. Furthermore, before the hydraulic lifter lifts the heavy object 7 or during the process of the hydraulic lifter lifting the heavy object 7, if the traction bodies 2 have different tightness and uneven force, all the second limit members can be pulled out from the positioning hole 321 of the support plate 32, and the second stop member 174 can be installed at the end of the second push rod 172. At this time, the tensioning mechanism 1 can restart the tensioning of each traction body 2.

[0093] The present application does not limit the number of the second position-limiting members. In this embodiment, the second position-limiting members are provided in two groups, each group of which contains two second position-limiting members that can be inserted into the symmetrically arranged positioning holes 321 on the fixing rod 32. In another embodiment, the second position-limiting members can be provided in one group, three groups, four groups, or more groups.

[0094] Furthermore, the hydraulic lifter further comprises a guide plate 18 for supporting the first hydraulic cylinder 15, and the guide plate 18 is detachably connected to the fixing rod 32. Figure 7 As shown, in this embodiment, the first hydraulic cylinder 15 can be placed on the guide plate 18, and the guide plate 18 is also provided with a seventh through hole for the piston rod 151 of the first hydraulic cylinder to pass through, so that the first hydraulic cylinder 15 can be extended or retracted.

[0095] Continue to refer to Figure 7 As shown, the hydraulic lifting equipment also includes a first anchor locking mechanism 4 and a second anchor locking mechanism 5. The first anchor locking mechanism 4 is arranged above the piston rod 31 of the second hydraulic cylinder, and the second anchor locking mechanism 5 is arranged below the piston rod 31 of the second hydraulic cylinder. The first anchor locking mechanism 4 and the second anchor locking mechanism 5 can respectively clamp or release the traction body 2. In this embodiment, the piston rod 31 of the second hydraulic cylinder is connected to the first anchor locking mechanism 4 and is used to drive the first anchor locking mechanism 4 to clamp or release the traction body 2. The bottom of the cylinder body of the second hydraulic cylinder 3 is connected to the second anchor locking mechanism 5 via a lower support rod. The second anchor locking mechanism 5 can be used to clamp or release the traction body 2, and can clamp or release the traction body 2 sequentially with the first anchor locking mechanism 4.

[0096] Reference Figure 7 As shown, the hydraulic lifting device further includes a third anchor locking mechanism 6, which is disposed below the second anchor locking mechanism 5 and is used to clamp or release the traction body 2. In one embodiment, the third anchor locking mechanism 6 is used to be fixedly connected to a weight 7.

[0097] Reference Figure 7 As shown, the first anchor locking mechanism 4 is provided with a first anchor plate 41 for clamping the traction body 2, the second anchor locking mechanism 5 is provided with a second anchor plate (unnumbered) for clamping the traction body 2, and the third anchor locking mechanism 6 is provided with a third anchor plate (unnumbered) for clamping the traction body 2, and the positions of the second clamping portion 12, the first anchor plate 41, the second anchor plate and the third anchor plate correspond to each other. In this embodiment, the second clamping part 12, the first anchor plate 41, the second anchor plate and the third anchor plate are all arranged in the vertical direction. In this way, when installing the traction body 2, the traction body 2 can be passed through the second anchor plate of the second anchor locking mechanism 5, the first anchor plate 41 of the first anchor locking mechanism 4, the limiting cone hole 111 of the first clamping part 11, the first through hole 122 of the second clamping part 12, the stepped hole 141 of the anchor lifting plate 14, and the second through hole of the pressure anchor plate 13 from bottom to top. After the first anchor locking mechanism 4 and the second anchor locking mechanism 5 lock the traction body 2, the other end of the traction body 2 is passed through the third anchor plate of the inverted third anchor locking mechanism 6 from top to bottom, so that the second clamping part 12 of the tensioning mechanism 1, the first anchor plate 41 of the first anchor locking mechanism 4, the second anchor plate of the second anchor locking mechanism 5 and the third anchor plate of the third anchor locking mechanism 6 can respectively clamp or release the traction body 2.

[0098] In this embodiment, when the tensioning mechanism 1 is used to tension the traction body 2, the first anchor locking mechanism 4 must usually be opened, and the second anchor locking mechanism 5 and the third anchor locking mechanism 6 must be closed, so that when the second clamping portion 12 and the first anchor plate 41 are both in the open state, the second anchor plate and the third anchor plate clamp the traction body 2, thereby preventing the traction body 2 from falling and also preventing multiple traction bodies 2 from being lifted together, causing overload damage to the traction body 2. Figure 7 As shown, the hydraulic lifting equipment further includes a lifter support structure 8 for supporting the second hydraulic cylinder 3 , and the placement position of the lifter support structure 8 can be set as needed.

[0099] In a non-limiting embodiment, the working process of the hydraulic lifting device is:

[0100] 1) Initial installation phase

[0101] Extend the piston rod 151 of the first hydraulic cylinder completely outward to prevent the first hydraulic cylinder 15 from being damaged by collision during transportation and installation; tighten the one-way overflow valve of the first hydraulic cylinder 15, install the second limit member in the positioning hole 321 of the fixing rod 32, and place the anchor plate 13 under the corresponding set of second limit members.

[0102] 2) Pre-tensioning stage

[0103] When the traction body 2 needs to be pre-tensioned, all the second limit members in the positioning hole 321 of the fixing rod 32 are pulled out; the overflow pressure in the one-way overflow valve in the first hydraulic cylinder 15 is adjusted to a smaller range; the second stop member 174 under the second push rod 172 is removed; the traction body 2 is passed through the second anchor plate, the first anchor plate 41, the second clamping portion 12 and the pressure anchor plate 13 in sequence; after the first and second anchor locking mechanisms are locked, the lower end of the traction body 2 is passed from top to bottom through the third anchor plate of the inverted third anchor locking mechanism 6 After locking, check whether the traction body 2 has misaligned holes, twisting, or skew. If not, extend the second hydraulic cylinder 3 within a smaller pressure range to preload and tension all the traction bodies 2. If the traction bodies 2 between the second anchor locking mechanism 5 and the third anchor locking mechanism 6 are in a relaxed state, after the piston rod 31 of the second hydraulic cylinder is extended, reinstall the second limiter in the positioning hole 321 of the fixed rod 32, and place the pressure anchor plate 13 on the corresponding set of second limiters to stop the tensioning mechanism 1. The traction body 2 is lifted multiple times through the cooperation of the first anchor locking mechanism 4, the second anchor locking mechanism 5, and the second hydraulic cylinder 3 until at least part of the traction body 2 is in a tensioned state.

[0104] Then visually check whether there is any obvious difference in tightness between the traction bodies 2; if there is any obvious difference in tightness between the traction bodies 2, enter the self-uniform tensioning stage; if there is no obvious difference in tightness between the traction bodies 2, you can directly enter the formal lifting stage.

[0105] 3) Self-uniform tensioning stage

[0106] Open the first anchor locking mechanism 4, while the second and third anchor locking mechanisms 5 and 6 are both closed. Remove all second stoppers from the positioning holes 321 of the fixing rod 32, and install the second stopper 174 under the second push rod 172 to put the tensioning mechanism 1 into operation. Adjust the flow rate of the main pump of the pump station, slow the extension speed of the second hydraulic cylinder 3, and adjust the overflow opening pressure of the one-way relief valve in the first hydraulic cylinder 15 as needed.

[0107] The piston rod 31 of the second hydraulic cylinder is driven to slowly extend, thereby driving the first push rod 171 to move the first clamping portion 11 in the first direction a. The anchor plate 13 above the second clamping portion 12 remains stationary under the limit of the first hydraulic cylinder 15. The second clamping portion 12 gradually enters the limiting tapered hole 111 of the first clamping portion 11, so that each second clamping portion 12 clamps the corresponding traction body 2.

[0108] After the traction body 2 is clamped, the piston rod 31 of the second hydraulic cylinder continues to extend and applies pressure to the first clamping part 11, the second clamping part 12 and the pressure anchor plate 13; when the pressure of the piston rod 151 of the first hydraulic cylinder by the pressure anchor plate 13 reaches a certain value, the one-way relief valve in the first hydraulic cylinder 15 opens, and the first hydraulic cylinder 15 begins to gradually shrink under the action of constant pressure. At this time, the first clamping part 11, the second clamping part 12 and the pressure anchor plate 13 begin to move in the first direction a, and the clamped traction body 2 is clamped. The body 2 can be stretched and tensioned successively in the process of following the movement of the corresponding second clamping part 12; wherein, after the traction body 2 that is stretched and tensioned first is stretched, since the clamping force of the stretched traction body 2 by the second clamping part 12 is smaller than the axial tension of the traction body 2, the stretched traction body 2 will slip at the clamping position of the corresponding second clamping part 12; and then the traction bodies 2 that are stretched and tensioned successively will also slip successively, and at this time the stretched and slipped traction bodies 2 can all be in a stretched state.

[0109] If some traction bodies 2 still do not slip after the piston rod 31 of the second hydraulic cylinder has been extended to the upper limit position, the piston rod 31 of the second hydraulic cylinder needs to be retracted to the lower limit position, and the second hydraulic cylinder 3 is extended and retracted once or more until all traction bodies 2 slip. At this time, all traction bodies 2 can be tensioned.

[0110] Then, install one or more sets of second stoppers in the positioning holes 321 of the fixing rod 32, and place the anchor plate 13 on the corresponding set of second stoppers. Simultaneously, remove the second stopper 174 below the second push rod 172, or simply remove the second fixing member 172, to deactivate the tensioning mechanism 1. Simultaneously, retract the piston rod 31 of the second hydraulic cylinder to the lower limit position, allowing the hydraulic lifting equipment to enter the official lifting phase.

[0111] 4) Formal promotion stage

[0112] After the tensioning mechanism 1 stops working, the first anchor locking mechanism 4, the second anchor locking mechanism 5 and the second hydraulic cylinder 3 cooperate to lift the heavy object 7. During the lifting process of the heavy object 7, if it is found that the tensioning bodies 2 are not uniformly tight and are not evenly stressed (that is, one or more of the tensioning bodies 2 are suspended in the air and are no longer stressed), it is necessary to open the first anchor locking mechanism 4 and retract the piston rod 31 of the second hydraulic cylinder to the lower limit position without load. At the same time, the tensioning mechanism 1 enters the working state and the tensioning bodies 2 enter the self-uniform tensioning stage of the hydraulic lifting equipment again. When all the tensioning bodies 2 are in the tensioned state, the formal lifting stage can be entered again as needed.

[0113] In summary, the hydraulic lifting equipment and its tensioning mechanism provided by the present invention can enable the clamping device to clamp the traction body 2 through the mutual cooperation of the driving device and the limiting device, and can enable the clamping device, the limiting device and the traction body 2 to move in the first direction a under the drive of the driving device, so that each clamped traction body 2 can be tensioned successively during the movement, and when there are multiple traction bodies 2, the tightness of each traction body 2 can be basically consistent and can be basically evenly stressed when lifting the heavy object 7, and can ensure that each traction body 2 can lift the heavy object 7 together, thereby ensuring the safety and reliability of the hydraulic lifting equipment during operation, and can also save the debugging time of the hydraulic lifting equipment to a large extent, effectively improve the operating efficiency of the hydraulic lifting equipment in the preparation stage, and fill the gap in the field of automatic tensioning technology of traction bodies.

[0114] The inner surface roughness Ra and the outer surface roughness Ra of the second clamping part in the hydraulic lifting equipment provided by the present invention are both less than or equal to 1.6um; and the Rockwell hardness HRA of the inner surface and the Rockwell hardness HRA of the outer surface of the second clamping part are both greater than 80. At the same time, the inclination angle of the outer surface of the second clamping part 12 is between 7.0° and 9.0°, and the inclination angle of the outer surface of the second clamping part 12 is greater than the self-locking angle between the first clamping part 11 and the second clamping part 12. Under the axial pressure of the limiting device, the tensioned traction body 2 of the second clamping part 12 can slide relative to the corresponding second clamping part 12, and thereafter, each traction body 2 that is tensioned and tensioned successively will also slip successively after tensioning, thereby achieving consistent tightness of all traction bodies 2 and being able to bear uniform force when lifting heavy objects, further ensuring the safety of the hydraulic lifting equipment.

[0115] 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 tensioning mechanism for a hydraulic lifting device, used to tension multiple traction bodies before the hydraulic lifter lifts a heavy object, characterized in that: The invention comprises a driving device, a clamping device and a limiting device; the clamping device comprises a first clamping portion and a plurality of second clamping portions; the driving device is connected to the first clamping portion and is used to drive the first clamping portion to move relative to the second clamping portion; the limiting device is connected to the second clamping portion to limit the position of the second clamping portion; The tensioning mechanism is configured to enable each of the second clamping parts to clamp a corresponding one of the traction bodies when the driving device drives the first clamping part to move along a first vertical direction; The tensioning mechanism is further configured to enable each of the second clamping portions to release a corresponding one of the traction bodies when the driving device drives the first clamping portion to move along a second vertical direction; The tensioning mechanism is further configured such that, after the clamping device clamps the traction body, the driving device can drive the clamping device and the limiting device to move together along the first direction to tension all the traction bodies respectively; the first direction is opposite to the second direction; The inner surface and the outer surface of the second clamping portion are both smooth, and the tensioning mechanism is further configured so that when a portion of the traction body is tensioned, the tensioned traction body can slide relative to the second clamping portion; The hydraulic lifter includes a second hydraulic cylinder for driving a load. When the second hydraulic cylinder lifts a heavy object, the second clamping portion can release the traction body and the tensioning mechanism can stop working.

2. The tensioning mechanism of the hydraulic lifting equipment according to claim 1, characterized in that: The first clamping portion and the limiting device are arranged in parallel up and down, and a limiting tapered hole is provided on the first clamping portion; The tensioning mechanism is configured to, when the driving device drives the first clamping portion to move along the first direction, cause at least a portion of the second clamping portion to enter the limiting tapered hole until the second clamping portion clamps the traction body; The tensioning mechanism is further configured to cause at least a portion of the second clamping portion to disengage from the limiting tapered hole when the driving device drives the first clamping portion to move along the second direction, until the second clamping portion releases the traction body.

3. The tensioning mechanism of the hydraulic lifting equipment according to claim 2, characterized in that: The first clamping portion and the limiting device are both flat plate members, the number of the limiting tapered holes is multiple, the number of the second clamping portions corresponds to the number of the limiting tapered holes, and each second clamping portion is used to clamp one of the traction bodies.

4. The tensioning mechanism of the hydraulic lifting equipment according to claim 2, characterized in that: The second clamping portion is a hollow truncated cone structure formed by splicing at least two pipe segments, with a gap between any two pipe segments after the traction body penetrates. The outer diameter of the second clamping portion gradually increases from one end to the other end along the first direction, and the shape of the limiting tapered hole matches the shape of the outer surface of the second clamping portion. When the second clamping portion enters the limiting through hole, the gap between any adjacent pipe segments in the second clamping portion gradually decreases until the second clamping portion clamps the traction body.

5. The tensioning mechanism of the hydraulic lifting equipment according to any one of claims 2 to 4, characterized in that: The inner surface roughness Ra and the outer surface roughness Ra of the second clamping part are both less than or equal to 1.6um; and the Rockwell hardness HRA of the inner surface and the Rockwell hardness HRA of the outer surface of the second clamping part are both greater than 80; when the axial force of the external load applied to the traction body is greater than the clamping force of the second clamping part, slippage will occur between the traction body and the second clamping part.

6. The tensioning mechanism of the hydraulic lifting equipment according to any one of claims 1 to 4, characterized in that: The limiting device includes an anchor pressure plate and an anchor lifting plate. The anchor pressure plate is arranged parallel to the first clamping portion in a vertical direction. The anchor lifting plate is connected to the anchor pressure plate and the second clamping portion respectively.

7. The tensioning mechanism of the hydraulic lifting equipment according to any one of claims 2 to 4, characterized in that: It also includes a supporting device connected to the limiting device, the limiting device is arranged above the first clamping portion, and the supporting device is arranged above the limiting device; Before clamping the traction body, the supporting device is used to fix the position of the limiting device; After clamping the traction body, the driving device is used to drive the clamping device, the limiting device and part of the supporting device to move together along the first direction; After all the traction bodies are tensioned, the support device is used to fix the position of the limiting device so that when the driving device drives the first clamping part to move along the second direction, the second clamping part can be separated from the first clamping part and release the traction body.

8. The tensioning mechanism of the hydraulic lifting equipment according to claim 7, characterized in that: The supporting device includes a double-acting, double-rod, and uniform-cross-section first hydraulic cylinder, one end of each piston rod of the first hydraulic cylinder being connected to the limit device; the first hydraulic cylinder is a hydraulic resistor, and the upper chambers and lower chambers of all the first hydraulic cylinders are connected in parallel, the upper chamber and lower chamber of the first hydraulic cylinder are respectively connected to the two ends of the one-way relief valve in the hydraulic resistor, and all the piston rods in the first hydraulic cylinder move synchronously; The one-way relief valve can only be turned into an open state when the piston rod is subjected to a certain pressure. Once the one-way relief valve is opened, the clamping device and the limiting device can move together in the first direction and are always subjected to constant pressure from the supporting device during movement; and before the one-way relief valve is opened, the position of the limiting device can be fixed by the supporting device to achieve the clamping of the traction body by the second clamping part.

9. The tensioning mechanism of the hydraulic lifting equipment according to claim 7, characterized in that: It also includes a release traction device connected to the limiting device and the first clamping part respectively; After releasing the traction body, the driving device is used to drive the first clamping portion to drive the release traction device and the limiting device to move along the second direction, so that the release traction device drives part of the supporting device to move along the second direction.

10. The tensioning mechanism of the hydraulic lifting equipment according to claim 9, characterized in that: The release traction device includes a first limiting member and a first stop member. The limiting device is provided with a receiving hole for the first limiting member to pass through. One end of the first limiting member is used to be connected to the first clamping portion, and the other end is used to be connected to the first stop member after passing through the receiving hole; the first stop member is used to abut against the limiting device to pull the limiting device to move along the second direction together with the release traction device.

11. The tensioning mechanism of the hydraulic lifting equipment according to any one of claims 1 to 4, characterized in that: It also includes a thrust assembly connected to the first clamping part and the driving device respectively, and the thrust assembly is used to drive the first clamping part to move under the drive of the driving device.

12. The tensioning mechanism of the hydraulic lifting equipment according to claim 11, characterized in that: The thrust assembly includes a first push rod, a second push rod, a push rod seat, and a second stopper; the first push rod and the second push rod are fixedly connected, the first push rod is connected to the first clamping portion, and the second push rod is connected to the second stopper; the outer diameter of the first push rod is larger than the outer diameter of the second push rod; the push rod seat is sleeved on the second push rod and can slide relative to the second push rod under the drive of the driving device; The first push rod is used to drive the first clamping portion to move toward the first direction under the drive of the push rod seat, and the second stopper is used to drive the first clamping portion to move toward the second direction under the drive of the push rod seat.

13. A hydraulic lifting device, characterized in that: A hydraulic lifter and a tensioning mechanism of the hydraulic lifting device according to any one of claims 1 to 12, wherein the tensioning mechanism is arranged on the top of the hydraulic lifter; the tensioning mechanism is used to tension the plurality of traction bodies before the hydraulic lifter lifts a heavy object; the hydraulic lifter includes a second hydraulic cylinder for driving the load; The hydraulic lifting equipment also includes a first anchor locking mechanism and a second anchor locking mechanism, the first anchor locking mechanism is arranged above the second hydraulic cylinder, and the second anchor locking mechanism is arranged below the second hydraulic cylinder; after the tensioning mechanism stops working, the first anchor locking mechanism, the second anchor locking mechanism and the second hydraulic cylinder cooperate to lift the heavy object.

14. The hydraulic lifting device according to claim 13, wherein: The hydraulic lifter includes a plurality of fixed rods for supporting the tensioning mechanism; the driving device includes the second hydraulic cylinder; one end of all the fixed rods is connected to the second hydraulic cylinder, and the other end is connected to the tensioning mechanism.

15. The hydraulic lifting device according to claim 14, characterized in that It also includes a second limiting member, which is detachably connected to at least a portion of the fixing rod to fix the position of the limiting device.

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