Screw adjustment mechanism, multi-lobed grab bucket and crane

Abstract

The present invention provides a spiral adjustment mechanism, which is applied to a multi-petal grab, including an axial limit sleeve, a rotary drive assembly and a plurality of rotary adjustment blocks. The present invention also provides a multi-petal grab, including the above-mentioned spiral adjustment mechanism, a central column and a plurality of groups of dynamic gripping mechanisms, each group of dynamic gripping mechanisms including a dynamic support assembly, a dynamic gripper rotatably connected to the dynamic support assembly, a first telescopic drive assembly also being provided on the dynamic support assembly, and a rotary adjustment block being connected to the dynamic support assembly. The present invention also provides a crane, including the above-mentioned multi-petal grab and a mechanical arm, the mechanical arm being connected to the central column. The spiral adjustment mechanism drives the dynamic support assembly to slide along the circumference of the central column, and the dynamic gripper and the first telescopic drive assembly arranged on the dynamic support assembly also move accordingly, and the relative position relationship between the dynamic grippers changes, that is, the gripping point of the dynamic gripper can be adjusted, so that it is suitable for grabbing conventional waste and special waste.

Description

Technical Field

[0001] The present invention relates to the field of lifting equipment, and in particular to a spiral adjustment mechanism, a multi-petal grab bucket capable of adjusting the relative position relationship between claws, and a crane with a multi-petal grab bucket Background Art

[0002] Blasting sites such as buildings, dams and mines generate a large amount of waste, and the transfer and handling of this waste often requires the use of a crane with a multi-petal grab bucket.

[0003] The existing multi-petal grabs are more common with two-petal and four-petal grabs. However, due to the different shapes of these wastes, the required grabs are not the same: the two-petal grab can be used to grab thin and long wastes. If it grabs square or round wastes, the grabbing position may be inappropriate, resulting in unstable center of gravity and easy to cause dangerous accidents; the four-petal grab is more suitable for grabbing square or round wastes. Because the four claws will move toward the center at the same time during the grabbing process, it is not suitable for grabbing thin and long wastes. In addition, when the waste is irregular in shape, the two-petal and four-petal grabs cannot be used to grab it, and it is necessary to adjust the position and angle of the grab and move the position of the whole vehicle, which consumes more time.

[0004] In view of this situation, most of the multi-petal grabs on the market currently start with adjusting the overall position of the grab, and achieve the purpose by rotating the grab as a whole. However, in the process of adjusting the overall position of the grab, the relative position relationship between the claws does not change, and the grabbing points of the claws are relatively fixed, which is still not suitable for grabbing certain special wastes, and it is difficult to overcome the defect of not being able to grab the waste forms suitable for two-petal grabs and four-petal grabs at the same time. Summary of the invention

[0005] In order to solve the problem that the gripping point of the gripper in the prior art is relatively fixed, not suitable for gripping certain special waste materials, and unable to adjust the gripper structure in time according to different forms of waste materials, one of the purposes of the present invention is to provide a spiral adjustment mechanism.

[0006] The present invention provides the following technical solutions:

[0007] A spiral adjustment mechanism, applied to a multi-petal grab, comprising:

[0008] An axial limiting sleeve, the axial limiting sleeve being slidably sleeved on the central column of the multi-petal grab;

[0009] A rotary drive assembly, the rotary drive assembly is used to drive the axial limiting sleeve to slide along the axial direction of the central cylinder;

[0010] and a plurality of rotation adjustment blocks, wherein the rotation adjustment blocks are driven by the axial limiting sleeve and respectively move along the circumference of the central cylinder when the axial limiting sleeve slides.

[0011] As a further optional scheme for the spiral adjustment mechanism, a plurality of sliding grooves are opened on the axial limiting sleeve along the circumference of the central column, and a plurality of spiral guide grooves are opened on the side wall of the central column. The number of the rotation adjustment blocks, sliding grooves and guide grooves corresponds, and the rotation adjustment blocks slideably cooperate with the corresponding sliding grooves and guide grooves respectively.

[0012] As a further optional solution for the spiral adjustment mechanism, the rotary drive assembly is a rotary adjustment hydraulic cylinder, one end of the rotary adjustment hydraulic cylinder is rotatably connected to the central column, and the other end of the rotary adjustment hydraulic cylinder is rotatably connected to the axial limiting sleeve.

[0013] Another object of the present invention is to provide a multi-petal grab bucket capable of adjusting the relative position relationship between the claws.

[0014] The present invention provides the following technical solutions:

[0015] A multi-petal grab bucket comprises the above-mentioned spiral adjustment mechanism, a central column and a plurality of sets of dynamic grabbing mechanisms;

[0016] Each group of the dynamic gripping mechanism comprises a dynamic support assembly, the dynamic support assembly is slidably arranged on the central column along the circumference of the central column, a dynamic gripper is rotatably connected to the dynamic support assembly, and a first telescopic driving assembly for driving the dynamic gripper to rotate is also provided on the dynamic support assembly;

[0017] The rotation adjustment block is connected to the dynamic support assembly.

[0018] As a further optional solution for the multi-petal grab bucket, the number of the dynamic gripping mechanisms is 2n, and n is a positive integer not less than 2, and the moving directions of any two adjacent dynamic gripping mechanisms are opposite.

[0019] As a further optional solution for the multi-petal grab bucket, the dynamic grabbing mechanism is evenly distributed on the central column when it is at the midpoint of the moving stroke.

[0020] As a further optional solution for the multi-petal grab bucket, it also includes a fixed grasping mechanism, which is fixedly connected to the central column, the number of the fixed grasping mechanisms is half the number of the dynamic grasping mechanisms, and every two of the dynamic grasping mechanisms move closer to or farther away from each other with one fixed grasping mechanism as the center.

[0021] As a further optional scheme for the multi-petal grab, the number of the dynamic gripping mechanisms is 4n, and n is a positive integer not less than 2, every four consecutive dynamic gripping mechanisms form a unit, and the four dynamic gripping mechanisms of the same unit move closer to or apart from each other when moving.

[0022] As a further optional scheme for the multi-petal grab, the dynamic support assembly includes a first support member and a second support member, the first support member and the second support member are connected by a rotating synchronization rod, the rotating synchronization rod is parallel to the axis of the central column, the rotating adjustment block is slidably mounted on the rotating synchronization rod, and the first telescopic drive assembly includes a telescopic adjustment hydraulic cylinder, one end of the telescopic adjustment hydraulic cylinder is rotatably connected to the first support member, and the other end of the telescopic adjustment hydraulic cylinder is rotatably connected to the dynamic gripper, and the dynamic gripper is rotatably connected to the second support member.

[0023] Another object of the present invention is to provide a crane with a multi-petal grab bucket.

[0024] The present invention provides the following technical solutions:

[0025] A crane comprises the above-mentioned multi-petal grab and a mechanical arm, wherein the mechanical arm is connected to an end of the central column away from the dynamic grab.

[0026] The embodiments of the present invention have the following advantages:

[0027] The spiral adjustment mechanism of the multi-petal grab bucket drives the dynamic support assembly to slide along the circumference of the central column, and the dynamic gripper and the first telescopic drive assembly arranged on the dynamic support assembly also move accordingly. The dynamic gripper can always open and close under the drive of the first telescopic drive assembly, and the relative position relationship between each dynamic gripper changes, that is, the gripping point of the dynamic gripper can be adjusted, so that it is suitable for grabbing conventional and special forms of waste.

[0028] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and understandable, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0030] Figure 1 The overall isometric structural diagram of the spiral adjustment mechanism provided by Embodiment 1 of the present invention is shown;

[0031] Figure 2 The overall axonometric structure schematic diagram of the multi-petal grab provided in Example 2 of the present invention is shown;

[0032] Figure 3A top view of the dynamic grabbing mechanism of the multi-petal grab provided in Example 2 of the present invention is shown;

[0033] Figure 4 for Figure 3 Schematic diagram of the AA section;

[0034] Figure 5 The figure shows an axonometric structural diagram of a spiral adjustment mechanism of a multi-petal grab provided in Example 2 of the present invention;

[0035] Figure 6 It shows a schematic structural diagram of a multi-petal grab bucket in a four-petal state provided by Embodiment 2 of the present invention;

[0036] Figure 7 A schematic diagram of the structure of the multi-petal grab provided in Example 2 of the present invention in a two-petal state is shown;

[0037] Figure 8 It shows a schematic structural diagram of the multi-petal grab provided by Embodiment 2 of the present invention in another two-petal state;

[0038] Fig. 9 It shows a schematic structural diagram of a multi-petal grab bucket in a six-petal state provided by Embodiment 3 of the present invention;

[0039] Fig.10 A schematic structural diagram of the multi-petal grab provided in Example 3 of the present invention in a two-petal state is shown.

[0040] Description of main component symbols:

[0041] 1-central column; 11-guide groove; 12-first support and limit cylinder; 121-first inner slideway; 122-first outer slideway; 13-first end plate; 14-second support and limit cylinder; 141-second inner slideway; 142-second outer slideway; 15-second end plate; 16-first step surface; 17-second step surface; 18-annular groove; 19-connecting plate; 2-dynamic gripping mechanism; 21-dynamic support assembly; 211-first support member; 2111-first inner slide block; 2112 -first outer slider; 212-second support member; 2121-second inner slider; 2122-second outer slider; 213-rotation synchronization rod; 2131-limiting plate; 2132-nut; 22-dynamic gripper; 221-weight reduction groove; 222-reinforcement column; 23-first telescopic drive assembly; 231-telescopic adjustment hydraulic cylinder; 3-screw adjustment mechanism; 311-rotation adjustment hydraulic cylinder; 32-axial limiting sleeve; 321-slideway; 33-rotation adjustment block; 4-fixed gripper. DETAILED DESCRIPTION

[0042] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0043] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. In contrast, when an element is referred to as being "directly on" another element, there is no intermediate element. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0044] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0045] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0046] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of the template are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0047] Example 1

[0048] See also Figure 1 This embodiment provides a spiral adjustment mechanism for a multi-petal grab bucket, including a rotary drive assembly, an axial limiting sleeve 32 and a plurality of rotary adjustment blocks 33.

[0049] In this embodiment, the rotation driving component is a rotation adjustment hydraulic cylinder 311 .

[0050] The axial limiting sleeve 32 is slidably sleeved on the central column 1 along the axial direction of the central column 1 of the multi-petal grab, and the inner diameter of the axial limiting sleeve 32 is equal to the diameter of the central column 1. A plurality of slide grooves 321 are provided on the side wall of the axial limiting sleeve 32, and each slide groove 321 is arranged along the circumference of the central column 1 and is evenly arranged along the circumference of the central column 1, and the slide grooves 321 are through grooves.

[0051] Correspondingly, a plurality of spiral guide grooves 11 are provided on the side wall of the central column 1, and the width of the guide grooves 11 is greater than the width of the slide grooves 321. The guide grooves 11 are evenly arranged along the circumference of the central column 1, and the number of the guide grooves 11 and the slide grooves 321 corresponds to the number of the rotation adjustment blocks 33. In this embodiment, the number of the guide grooves 11 is four.

[0052] The aforementioned rotation adjustment block 33 is arranged along the radial direction of the central column 1 , one end of the rotation adjustment block 33 is slidably matched with the guide groove 11 , and the middle part of the rotation adjustment block 33 is slidably matched with the slide groove 321 .

[0053] The cylinder body of the rotation adjustment hydraulic cylinder 311 is connected to the side wall of the central column 1, and the piston rod is connected to the axial limiting sleeve 32. When the piston rod of the rotation adjustment hydraulic cylinder 311 is extended and retracted, it will pull the axial limiting sleeve 32 to slide along the axial direction of the central column 1, thereby driving the rotation adjustment block 33 to move. Under the guidance of the guide groove 11, the rotation adjustment block 33 moves along the axial direction of the central column 1 and also moves along the circumferential direction of the central column 1.

[0054] The guide groove 11 can also be arranged on the axial limiting sleeve 32 , and the sliding groove 321 is correspondingly arranged on the central column 1 .

[0055] Taking into account the installation error, the axis of the rotary adjustment hydraulic cylinder 311 may not be parallel to the axis of the central column 1. At this time, if the axial limit sleeve 32 slides on the central column 1, the angle between the axis of the rotary adjustment hydraulic cylinder 311 and the axis of the central column 1 will change. Therefore, the rotary adjustment hydraulic cylinder 311 is rotatably connected to the central column 1 and the axial limit sleeve 32, and the rotation axis of the rotary adjustment hydraulic cylinder 311 relative to the central column 1 and the axial limit sleeve 32 is perpendicular to the axis of the central column 1.

[0056] Example 2

[0057] Please also read Figure 2-Figure 5 The present embodiment provides a multi-petal grab, comprising a central column 1. The central column 1 is cylindrical, and two pairs of connecting plates 19 are welded and fixed on the end surface of one end of the central column 1 for detachably connecting with the mechanical arm of the crane.

[0058] The central column 1 is provided with a plurality of groups of dynamic gripping mechanisms 2 and a group of spiral adjustment mechanisms 3. Each group of dynamic gripping mechanisms 2 includes a dynamic gripper 22, and the dynamic gripper 22 cooperates with other structures in the dynamic gripping mechanism 2 to complete the movement of closing or opening.

[0059] The spiral adjustment mechanism 3 can change the position of each dynamic gripping mechanism 2 along the circumference of the central column 1, thereby changing the relative position relationship between each dynamic gripper 22, so that the entire multi-petal grab bucket can have different gripping points, thereby being suitable for grabbing waste in different forms.

[0060] For example, for a piece of waste material with an irregular shape, the position of the dynamic gripper 22 can be adjusted by the spiral adjustment mechanism 3 so that the dynamic gripper 22 avoids the edges and corners on the waste material and contacts the relatively flat area on the waste material. At the same time, the dynamic gripper 22 is distributed as evenly as possible around the waste material, and finally the waste material is smoothly grasped.

[0061] The dynamic gripping mechanism 2 is composed of a dynamic support assembly 21, a dynamic gripper 22 and a first telescopic drive assembly 23. The dynamic support assembly 21 is slidably arranged on the central column 1 along the circumference of the central column 1, the dynamic gripper 22 and the first telescopic drive assembly 23 are installed on the dynamic support assembly 21, and the dynamic gripper 22 is driven by the first telescopic drive assembly 23 to move.

[0062] The dynamic support assembly 21 includes a first support member 211, a second support member 212 and a rotation synchronization rod 213, wherein the first support member 211 and the second support member 212 are directly connected to the central column 1 and slide with the central column 1 along the circumference of the central column 1. The rotation synchronization rod 213 is parallel to the axis of the central column 1, and the two ends of the rotation synchronization rod 213 are respectively connected to the first support member 211 and the second support member 212, so that the first support member 211 and the second support member 212 are synchronized during the movement. The aforementioned spiral adjustment mechanism 3 directly acts on the rotation synchronization rod 213 to achieve the adjustment of the position of the entire dynamic gripping mechanism 2.

[0063] Specifically, a first support and limit cylinder 12 is sleeved on one end of the central column 1 facing the connecting plate 19. The axis of the first support and limit cylinder 12 coincides with the axis of the central column 1, the inner diameter of the first support and limit cylinder 12 is equal to the diameter of the central column 1, and an annular first end plate 13 is provided on one end of the first support and limit cylinder 12 facing the connecting plate 19. The first end plate 13 is perpendicular to the axis of the central column 1, and the first end plate 13 is fixed to the first support and limit cylinder 12 by welding or integral molding. At the same time, the first end plate 13 fits the end face of the central column 1 where the connecting plate 19 is located, and is fixed to the end face of the central column 1 by screws, thereby fixing the first support and limit cylinder 12 to the central column 1.

[0064] A first step surface 16 is provided on the side wall of the central column 1 in the area directly facing the first support and limit cylinder 12, so the inner wall of the first support and limit cylinder 12 does not directly contact the central column 1, but forms an annular first inner slideway 121. In addition, a plurality of through grooves are provided on the side wall of the first support and limit cylinder 12 to form a first outer slideway 122. The number of the first outer slideways 122 corresponds to the number of the dynamic gripping mechanism 2, and the first outer slideways 122 are all arranged along the circumference of the central column 1.

[0065] The first support member 211 is composed of a first inner slider 2111 and a first outer slider 2112. The first inner slider 2111 is slidably disposed in the first inner slideway 121, one side of the first inner slider 2111 abuts against the first end plate 13, and the other side abuts against the first step surface 16. The first outer slider 2112 is disposed along the radial direction of the central column 1, one end of the first outer slider 2112 is slidably disposed in the first outer slideway 122, and is fixedly connected to the first inner slider 2111 by welding or integral molding.

[0066] During assembly, each first support member 211 is first placed inside the first support limiting cylinder 12, and then the first outer slider 2112 is passed through the first outer slideway 122 from the inside to the outside until the first inner slider 2111 abuts against the inner wall of the first support limiting cylinder 12. Then, the first support limiting cylinder 12 and the first end plate 13 are buckled on the end of the central column 1 facing the connecting plate 19, and the screws are tightened to realize the sliding connection between the first support member 211 and the central column 1.

[0067] Similarly, a second support and limit cylinder 14 is sleeved on the end of the central column 1 facing away from the connecting plate 19. The axis of the second support and limit cylinder 14 coincides with the axis of the central column 1, the inner diameter of the second support and limit cylinder 14 is equal to the diameter of the central column 1, and an annular second end plate 15 is provided on the end of the second support and limit cylinder 14 facing away from the first support and limit cylinder 12. The second end plate 15 is perpendicular to the axis of the central column 1, and the second end plate 15 is fixed to the second support and limit cylinder 14 by welding or integral molding. At the same time, the second end plate 15 fits with the end face of the end of the central column 1 facing away from the connecting plate 19, and is fixed to the end face of the central column 1 by screws, thereby fixing the second support and limit cylinder 14 to the central column 1.

[0068] A second step surface 17 is provided on the side wall of the central column 1 in the area directly facing the second support and limit cylinder 14, so the inner wall of the second support and limit cylinder 14 does not directly contact the central column 1, but forms an annular second inner slideway 141. In addition, a plurality of through grooves are provided on the side wall of the second support and limit cylinder 14 to form a second outer slideway 142. The number of the second outer slideways 142 also corresponds to that of the dynamic gripping mechanism 2, and the second outer slideways 142 are all arranged along the circumference of the central column 1.

[0069] The second support member 212 is composed of a second inner slider 2121 and a second outer slider 2122. The second inner slider 2121 is slidably disposed in the second inner slideway 141, one side of the second inner slider 2121 abuts against the second end plate 15, and the other side is flush with the end surface of the second support limit cylinder 14. The second outer slider 2122 is disposed along the radial direction of the central column 1, one end of the second outer slider 2122 is slidably disposed in the second outer slideway 142, and is fixedly connected to the second inner slider 2121 by welding or integral molding.

[0070] During assembly, firstly place each second support member 212 inside the second support limiting cylinder 14, and then make the second outer slider 2122 pass through the second outer slideway 142 from the inside to the outside until the second inner slider 2121 abuts against the inner wall of the second support limiting cylinder 14. Then, the second support limiting cylinder 14 and the second end plate 15 are buckled on the end of the central column 1 facing away from the connecting plate 19, and screws are tightened to realize the sliding connection between the second support member 212 and the central column 1.

[0071] Specifically, the rotation synchronization rod 213 passes through the middle of the first outer slider 2112 and the second outer slider 2122, one end of the rotation synchronization rod 213 is welded and fixed with a limit plate 2131, and the other end is threadedly matched with a nut 2132. The limit plate 2131 abuts against the side of the first outer slider 2112 facing away from the second outer slider 2122, and the nut 2132 abuts against the side of the second outer slider 2122 facing away from the first outer slider 2112, so as to stably connect the rotation synchronization rod 213 with the first outer slider 2112 and the second outer slider 2122.

[0072] Specifically, the aforementioned first telescopic drive assembly 23 adopts a telescopic adjustment hydraulic cylinder 231. The cylinder body of the telescopic adjustment hydraulic cylinder 231 is rotatably connected to one end of the first outer slider 2112 facing away from the first inner slider 2111, and the piston rod is rotatably connected to the dynamic gripper 22, and the dynamic gripper 22 is also rotatably connected to one end of the second outer slider 2122 facing away from the second inner slider 2121. In addition, the rotation axis of the telescopic adjustment hydraulic cylinder 231 relative to the first outer slider 2112, the rotation axis of the telescopic adjustment hydraulic cylinder 231 relative to the dynamic gripper 22, and the rotation axis of the dynamic gripper 22 relative to the second outer slider 2122 are parallel to each other and perpendicular to the axis of the central column 1.

[0073] When the piston rod of the telescopic adjustment hydraulic cylinder 231 is extended, the end of the movable gripper 22 is driven to move closer to the axis of the central column 1 to grab the waste material. Conversely, when the piston rod of the telescopic adjustment hydraulic cylinder 231 is retracted, the waste material is released.

[0074] The dynamic gripper 22 is provided with a weight-reducing groove 221 , and four reinforcing columns 222 are welded in the weight-reducing groove 221 , so as to reduce the weight of the dynamic gripper 22 and ensure that the dynamic gripper 22 has sufficient structural strength.

[0075] In this embodiment, the number of the rotation adjustment blocks 33 corresponds to the number of the rotation synchronization rods 213 . The end of the rotation adjustment block 33 facing away from the central column 1 is sleeved on the rotation synchronization rod 213 and slidably cooperates with the rotation synchronization rod 213 along the length direction of the rotation synchronization rod 213 .

[0076] When the rotation adjustment block 33 moves along the circumferential direction of the central column 1 , it drives the rotation synchronization rod 213 , thereby causing the dynamic gripping mechanism 2 to move as a whole, thereby adjusting the relative positions of the dynamic grippers 22 .

[0077] In addition, two annular grooves 18 are formed on the central column 1 , and the two annular grooves 18 are respectively connected to two ends of each guide groove 11 .

[0078] In this embodiment, the dynamic gripping mechanism 2 is arranged in pairs, specifically four groups, and the number of the corresponding guide grooves 11, the slide grooves 321 and the rotation adjustment block 33 is four. In addition, the rotation directions of any two adjacent guide grooves 11 are opposite, the minimum distance between any two adjacent guide grooves 11 is equal, and the maximum distance between any two adjacent guide grooves 11 is also equal.

[0079] See also Figure 6 When the rotation adjustment block 33 is located in the middle of the guide groove 11, the four rotation adjustment blocks 33 are evenly distributed along the circumference of the central column 1. At this time, the four sets of dynamic grasping mechanisms 2 are also evenly distributed along the circumference of the central column 1. The present application is specifically manifested as a four-petal grab, which is suitable for grabbing square or round waste.

[0080] See also Figure 7 and Figure 8 When the rotating adjustment block 33 is located at any end of the guide groove 11, the four groups of dynamic grasping mechanisms 2 can be divided into two pairs, and the two groups of dynamic grasping mechanisms 2 in the same pair are adjacent and close to each other. The present application is specifically manifested as a two-petal grab, which is suitable for grabbing long strips of waste.

[0081] Example 3

[0082] Please also read Fig. 9 and Fig.10 The difference from the embodiment 1 is that there is another set of fixed gripping mechanism between each pair of two sets of dynamic gripping mechanism 2. The two sets of dynamic gripping mechanism 2 are symmetrical about the line connecting the fixed gripping mechanism and the axis of the central column 1, and are brought together or separated with the fixed gripping mechanism as the center.

[0083] Similar to the structure of the dynamic gripping mechanism 2, the fixed gripping mechanism includes a fixed support assembly, a fixed gripper 4 and a second telescopic drive assembly. The fixed gripper 4 and the second telescopic drive assembly are both arranged on the fixed support assembly, and the fixed gripper 4 is rotatably connected to the fixed support assembly, and the second telescopic drive assembly can be a hydraulic cylinder or the like. The difference is that the fixed support assembly is directly or indirectly fixedly connected to the central column 1 and cannot slide along the circumference of the central column 1.

[0084] Specifically, four groups of dynamic gripping mechanisms 2 are provided, and two groups of fixed gripping mechanisms are provided.

[0085] When the two sets of dynamic gripping mechanisms 2 of the same pair are completely separated, the four dynamic grippers 22 and the two fixed grippers 4 are evenly arranged along the circumference of the central column 1. The present application is specifically manifested as a six-petal grab, which is suitable for grabbing round waste.

[0086] When the two groups of dynamic gripping mechanisms 2 of the same pair are completely closed together, the corresponding dynamic grippers 22 are concentrated toward the fixed grippers 4. The present application is specifically manifested as a two-piece grab bucket, which is suitable for grabbing long strips of waste.

[0087] Example 4

[0088] The difference from Example 1 is that the number of the dynamic grasping mechanisms 2 is eight groups, and each continuous four groups of dynamic grasping mechanisms 2 form a unit, and the four dynamic grasping mechanisms 2 of the same unit are folded or unfolded when moving.

[0089] When folded, the two groups of dynamic gripping mechanisms 2 in the middle are close to each other, and the two groups of dynamic gripping mechanisms 2 in the periphery are also close to each other, and the moving speed of the dynamic gripping mechanisms 2 in the periphery is greater than that of the dynamic gripping mechanisms 2 in the middle. After being fully folded, the present application is specifically manifested as a two-piece grab, which is suitable for grabbing long strips of waste.

[0090] When unfolded, the two sets of dynamic gripping mechanisms 2 in the middle are separated from each other, and the two sets of dynamic gripping mechanisms 2 in the periphery are also separated from each other, and the moving speed of the dynamic gripping mechanisms 2 in the periphery is greater than that of the dynamic gripping mechanisms 2 in the middle. After being fully unfolded, the present application is specifically manifested as an eight-petal grab, which is suitable for grabbing round waste.

[0091] Example 5

[0092] This embodiment provides a crane, including a mechanical arm and the above-mentioned multi-petal grab, the mechanical arm is connected to the end of the central column 1 away from the dynamic gripper 22. Specifically, the connecting plate 19 on the central column 1 is directly connected to the mechanical arm, or is suspended below the mechanical arm via a cable.

[0093] In all examples shown and described herein, any specific values ​​should be interpreted as merely exemplary and not as limiting, and thus other examples of the exemplary embodiments may have different values.

[0094] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0095] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. A spiral adjustment mechanism, applied to a multi-petal grab, characterized in that: include: An axial limiting sleeve, the axial limiting sleeve being slidably sleeved on the central column of the multi-petal grab; A rotary drive assembly, the rotary drive assembly is used to drive the axial limiting sleeve to slide along the axial direction of the central cylinder; and a plurality of rotation adjustment blocks, wherein the rotation adjustment blocks are driven by the axial limiting sleeve and respectively move along the circumference of the central cylinder when the axial limiting sleeve slides; The axial limiting sleeve is provided with a plurality of sliding grooves along the circumference of the central column, and the side wall of the central column is provided with a plurality of spiral guide grooves, and the number of the rotation adjustment block, the sliding grooves and the guide grooves corresponds to each other, and the rotation adjustment block is respectively slidably matched with the corresponding sliding grooves and guide grooves; The rotary drive assembly is a rotary adjustment hydraulic cylinder, one end of which is rotatably connected to the central column, and the other end of which is rotatably connected to the axial limiting sleeve.

2. A multi-petal grab bucket, characterized in that: It includes the spiral adjustment mechanism, the central column and a plurality of groups of dynamic gripping mechanisms as described in claim 1; Each group of the dynamic gripping mechanism comprises a dynamic support assembly, the dynamic support assembly is slidably arranged on the central column along the circumference of the central column, a dynamic gripper is rotatably connected to the dynamic support assembly, and a first telescopic driving assembly for driving the dynamic gripper to rotate is also provided on the dynamic support assembly; The rotation adjustment block is connected to the dynamic support assembly.

3. The multi-petal grab bucket according to claim 2, characterized in that: The number of the dynamic gripping mechanisms is 2n, and n is a positive integer not less than 2, and the moving directions of any two adjacent dynamic gripping mechanisms are opposite.

4. The multi-petal grab bucket according to claim 3, characterized in that: The dynamic grasping mechanism is evenly distributed on the central column when it is at the midpoint of the moving stroke.

5. The multi-petal grab bucket according to claim 3, characterized in that: It also includes a fixed grasping mechanism, which is fixedly connected to the central column. The number of the fixed grasping mechanisms is half of the number of the dynamic grasping mechanisms, and every two dynamic grasping mechanisms move closer to or farther away from each other with one fixed grasping mechanism as the center.

6. The multi-petal grab bucket according to claim 2, characterized in that: The number of the dynamic gripping mechanisms is 4n, and n is A positive integer not less than 2, every four consecutive dynamic grasping mechanisms form a unit, and the four dynamic grasping mechanisms of the same unit move closer to or spread out when moving.

7. The multi-petal grab bucket according to claim 2, characterized in that: The dynamic support assembly includes a first support member and a second support member, the first support member and the second support member are connected via a rotating synchronization rod, the rotating synchronization rod is parallel to the axis of the central column, the rotating adjustment block is slidably sleeved on the rotating synchronization rod, the first telescopic drive assembly includes a telescopic adjustment hydraulic cylinder, one end of the telescopic adjustment hydraulic cylinder is rotatably connected to the first support member, the other end of the telescopic adjustment hydraulic cylinder is rotatably connected to the dynamic gripper, and the dynamic gripper is rotatably connected to the second support member.

8. A crane, characterized in that: It comprises the multi-petal grab and mechanical arm as described in any one of claims 2 to 7, wherein the mechanical arm is connected to one end of the central column away from the dynamic gripper.

Images