A positioning mechanism of a rotary four-jaw lotus grab

Abstract

The utility model discloses a kind of positioning mechanisms of rotary four-claw lotus grab, it is related to lotus grab technical field, including mounting plate, the mounting plate bottom is provided with multiple groups of inserting rod, the mounting plate top is equipped with pull block, the mounting plate bottom center position is provided with the compression assembly that can move along vertical direction, the compression assembly is connected with the drive mechanism that drives its movement, the compression assembly below is provided with positioning assembly, the positioning assembly includes multiple clamping jaw that is arranged around the compression assembly circumferentially.The utility model sets positioning assembly, sets up guiding inclined surface and reduces the initial resistance when clamping jaw is gathered, the horizontal portion of L type can hold the bottom of material, and the vertical portion is from side constraint material.This shape is particularly beneficial to form stable wrapping space, prevent slender material from scattering from center in lifting process, and through V-shaped clamping groove, the bite force and friction between clamping jaw and material are increased, so that clamping force is multiplied.

Description

Technical Field

[0001] This utility model relates to the field of lotus claw technology, specifically a positioning mechanism for a rotating four-claw lotus claw. Background Technology

[0002] In ports, metallurgy, mining, and large-scale logistics warehousing, the lotus grab (or petal grab) is an important attachment widely used in bulk cargo loading and unloading operations. It achieves the grabbing and release of materials through the opening and closing of multiple jaws.

[0003] An existing patent (authorization announcement number: CN221521837U) discloses a positioning structure for a rotating four-claw lotus gripper. The key technical point of the solution is that it uses four positioning rods for positioning before gripping, and simultaneously starts a drive motor to drive the winding rod to rotate, thereby enabling the release and retraction of the pull rope. Pulling the pull rope moves the four movable rods inward to adjust the position of the four positioning rods. At the same time, the elastic connection between one end of the movable rod and the side frame allows the movable rod and its components to return to their original position. Compared with the prior art, which lacks pre-positioning of the rotating four-claw lotus gripper during use, thus greatly reducing the accuracy of the rotating four-claw lotus gripper.

[0004] However, the above technical solutions still have certain defects. For materials with loose surfaces or uneven block size, the gripper is prone to pushing the material apart during the closing process, rather than effectively enveloping and gripping it. The material is very likely to slip out of the gripping center at the moment the gripper closes, leading to operation failure and safety risks. Therefore, a positioning mechanism of a rotating four-claw lotus gripper is proposed. Utility Model Content

[0005] The purpose of this invention is to provide a positioning mechanism for a rotating four-claw lotus gripper to solve the problems in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A positioning mechanism for a rotating four-claw lotus claw includes a mounting plate, a set of insert rods at the bottom of the mounting plate, a lifting block at the top of the mounting plate, and a pressing component that can move in a vertical direction at the center of the bottom of the mounting plate. The pressing component is connected to a driving mechanism that drives its movement.

[0008] A positioning component is provided below the pressing component, and the positioning component includes multiple grippers arranged circumferentially around the pressing component; the drive mechanism is linked with all the grippers through a transmission mechanism;

[0009] The gripping end of the gripper is equipped with a fixed plate, and a positioning shovel is connected to the fixed plate through an elastic buffer structure.

[0010] Based on the above technical solutions, this utility model also provides the following optional technical solutions:

[0011] As a further embodiment of this utility model: the drive mechanism includes a drive motor fixedly mounted on the mounting plate, and the output end of the drive motor is connected to a vertically arranged threaded rod through a gear set; the transmission mechanism includes a nut seat that is threadedly engaged with the threaded rod.

[0012] As a further improvement of this utility model, the transmission mechanism also includes multiple connecting rods, one end of each connecting rod being hinged to the nut seat, and the other end being hinged to the upper middle part of the corresponding gripper.

[0013] As a further embodiment of this utility model: the pressing assembly includes a receiving plate connected to the driving mechanism, and a pressure plate fixedly installed at the bottom of the receiving plate, and an elastic pad is provided between the receiving plate and the pressure plate.

[0014] As a further embodiment of this utility model: the elastic buffer structure includes a damping sleeve fixed to a fixed plate, a sliding rod slidably passing through the damping sleeve, and a spring sleeved on the sliding rod and acting between the damping sleeve and the sliding rod; a positioning shovel is fixedly installed at the end of the sliding rod.

[0015] As a further improvement of this utility model: the positioning shovel is an L-shaped plate, and a guide inclined surface is provided on the side of its bottom facing the center of the mechanism.

[0016] As a further improvement of this utility model, the side of the gripper is provided with a V-shaped groove for increasing friction.

[0017] As a further improvement of this utility model, the elastic pad is an air cushion structure.

[0018] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0019] 1. This utility model reduces the initial resistance when the grippers retract by setting a positioning component and a guide inclined surface. The horizontal part of the L-shape can support the bottom of the material, while the vertical part restrains the material from the side. This shape is particularly conducive to forming a stable wrapping space, preventing slender materials from falling from the center during the lifting process. The V-shaped groove increases the biting force and friction between the grippers and the material, thus multiplying the clamping force.

[0020] 2. By setting up a pressing component, the air cushion can automatically adapt the pressure plate to the uneven material surface to achieve surface contact, while also providing dual positioning for the top and sides of the material, increasing the stability of the material being clamped. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of this utility model;

[0022] Figure 2 This is a schematic diagram of the pressing assembly of this utility model;

[0023] Figure 3 This is a schematic diagram of the drive mechanism of this utility model;

[0024] Figure 4 This is a schematic diagram of the positioning component of this utility model;

[0025] Figure 5 For the present utility model Figure 4 Enlarged view of point A in the middle.

[0026] Attached image references: 1. Mounting plate; 2. Insert rod; 3. Lifting block; 4. Pressing assembly; 5. Positioning assembly;

[0027] 41. Mounting bracket; 42. Drive motor; 43. Threaded rod; 44. Support plate; 45. Elastic pad; 46. Pressure plate; 47. Connecting rod;

[0028] 51. Gripper; 52. Fixing plate; 53. Damping sleeve; 54. Spring; 55. Sliding rod; 56. Positioning shovel. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments.

[0030] In one embodiment, such as Figures 1-5 As shown, a positioning mechanism for a rotating four-claw lotus claw includes a mounting plate 1, a plurality of insert rods 2 are provided at the bottom of the mounting plate 1, a lifting block 3 is installed at the top of the mounting plate 1, a pressing component 4 that can move in the vertical direction is provided at the center of the bottom of the mounting plate 1, the pressing component 4 is connected to a driving mechanism that drives its movement, and a positioning component 5 is provided below the pressing component 4.

[0031] In this embodiment, the ground is first fixed by the insertion rod 2 at the bottom of the mounting plate 1. The entire mechanism is lifted upward by the main lifting mechanism through the lifting block 3 at the top. The pressing component 4 is driven by the driving mechanism to press the top of the material. Then, the material is positioned and clamped by the gripper 51 in the positioning component 5.

[0032] In one embodiment, such as Figure 2 and Figure 3As shown, the drive mechanism includes a drive motor 42 fixedly mounted on the mounting plate 1. The output end of the drive motor 42 is connected to a vertically arranged threaded rod 43 via a gear set. The transmission mechanism includes a nut seat that is threadedly engaged with the threaded rod 43. The transmission mechanism also includes multiple connecting rods 47. One end of each connecting rod 47 is hinged to the nut seat, and the other end is hinged to the upper middle part of the corresponding gripper 51. The rotational power of the motor is transmitted to the threaded rod 43 through the gear set. At the same time, the rotation of the threaded rod 43 drives the nut seat to move vertically. When the nut seat moves upward, it pulls the upper end of the connecting rod 47 to tighten together. Since the lower end of the connecting rod 47 is hinged to the gripper 51, and the gripper 51 itself is hinged to the mounting plate 1 or the main frame via a pin, this downward pulling force will force the connecting rod 47 to push the upper middle part of the gripper 51. The upper middle part of the gripper 51 is subjected to an inward pushing force, and its bottom will generate a rotational motion around the fulcrum towards the center, ensuring the absolute synchronization of all grippers 51.

[0033] In one embodiment, such as Figure 4 and Figure 5 As shown, the positioning component 5 includes multiple grippers 51 arranged circumferentially around the pressing component 4; the drive mechanism is linked to all grippers 51 through a transmission mechanism. The gripping end of the gripper 51 is provided with a fixed plate 52. A positioning shovel 56 is connected to the fixed plate 52 through an elastic buffer structure. The positioning shovel 56 is an L-shaped plate with a guide inclined surface on the side of its bottom facing the center of the mechanism. The side of the gripper 51 is provided with a V-shaped groove to increase friction. In the initial stage of the gripper 51 closing, the guide inclined surface at the bottom of the positioning shovel 56 contacts the material first. When the inclined surface encounters resistance, it generates a component force that guides the material towards the center. At the same time, it can slide more easily into the lower layer of the material pile, reducing the tendency to push the material away directly. When the positioning shovel 56 contacts the material (especially hard or irregular materials), it will generate an impact. At this time, the elastic buffer structure allows the positioning shovel 56 to retract slightly via the compression spring 54, thereby absorbing impact energy and preventing damage to the mechanism and material from hard collisions. As the gripper 51 continues to close, the positioning shovel 56 overcomes the elastic force and firmly cuts into or adheres to the material. At this time, the vertical edge of the L-shaped plate is responsible for gripping the material from the side to prevent it from moving laterally.

[0034] In one embodiment, such as Figure 5As shown, the elastic buffer structure includes a damping sleeve 53 fixed on the fixed plate 52, a sliding rod 55 slidably passing through the damping sleeve 53, and a spring 54 sleeved on the sliding rod 55 and acting between the damping sleeve 53 and the sliding rod 55; a positioning shovel 56 is fixedly installed at the end of the sliding rod 55; when the gripper 51 drives the positioning shovel 56 to retract and contact the material surface, the material will generate a reverse force on the positioning shovel 56. The reverse force is transmitted to the sliding rod 55 through the positioning shovel 56, pushing the sliding rod 55 to slide inward toward the damping sleeve 53 and compressing the spring 54. Through each independent buffer structure, each positioning shovel 56 can independently fine-tune its position according to the situation it encounters, while the compression force of the spring 54 continuously presses against the material, enhancing the clamping force.

[0035] In one embodiment, such as Figure 2 As shown, the pressing assembly 4 includes a receiving plate 44 connected to the driving mechanism and a pressure plate 46 fixedly installed at the bottom of the receiving plate 44. An elastic pad 45, which is an air cushion structure, is provided between the receiving plate 44 and the pressure plate 46. After the gripper 51 clamps the material, the material moves upward as the gripper 51 tightens. At this time, the top of the material contacts the pressure plate 46. When the pressure plate 46 contacts the material, if the resistance encountered on one side of the pressure plate 46 is large and the resistance on the other side is small, the gas in the air cushion will flow from the high-pressure area to the low-pressure area. This allows the pressure plate 46 to tilt or deform slightly, automatically adapting to the contour of the material surface, ensuring that the contact area between the pressure plate 46 and the material is maximized, rather than just a few points of contact. Once the pressure plate 46 is completely attached to the material surface, the compressed air cushion will continuously apply a relatively constant and evenly distributed downward pressure to the pressure plate 46. This pressure comes from the elastic force of the compressed gas inside the air cushion attempting to expand and restore its original shape.

[0036] The above embodiment discloses a positioning mechanism for a rotating four-claw lotus gripper. A drive motor 42 starts and transmits power to a vertical threaded rod 43 via a gear set. The rotational motion of the threaded rod 43 is converted into a vertical downward linear motion of the nut seat. The receiving plate 44 transmits force to the pressure plate 46 via an air cushion. The air cushion buffers, levels, and evenly distributes pressure, allowing the pressure plate 46 to adaptively adhere to the top of the material, providing stable downward pressure. As the nut seat moves upward, it pushes the upper middle part of all the grippers 51 via a hinged connecting rod 47. The grippers 51 act as levers, their bottoms synchronously retracting towards the center. The positioning shovels 56 mounted on the gripping end move accordingly, their guide inclined surfaces cutting into the material first, guiding the retraction. The elastic buffer structure absorbs the impact and allows each positioning shovel 56 to independently fine-tune to adapt to irregular surfaces. The V-shaped grooves tightly grip the material, preventing rolling and slippage. When the downward pressure and radial clamping force reach equilibrium, the material is completely confined to the center of the gripper, forming a stable force-closed system.

[0037] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A positioning mechanism for a rotating four-claw lotus claw, comprising a mounting plate (1), wherein a plurality of insert rods (2) are provided at the bottom of the mounting plate (1), and a lifting block (3) is mounted at the top of the mounting plate (1), characterized in that, The mounting plate (1) has a pressing component (4) at the bottom center position that can move in the vertical direction, and the pressing component (4) is connected to a driving mechanism that drives its movement. A positioning component (5) is provided below the pressing component (4), and the positioning component (5) includes a plurality of grippers (51) arranged circumferentially around the pressing component (4); the driving mechanism is linked with all the grippers (51) through a transmission mechanism; The gripping end of the gripper (51) is provided with a fixing plate (52), and a positioning shovel (56) is connected to the fixing plate (52) through an elastic buffer structure.

2. The positioning mechanism for a rotating four-claw lotus gripper according to claim 1, characterized in that, The drive mechanism includes a drive motor (42) fixedly mounted on the mounting plate (1), and the output end of the drive motor (42) is connected to a vertically arranged threaded rod (43) through a gear set; the transmission mechanism includes a nut seat that is threadedly engaged with the threaded rod (43).

3. The positioning mechanism for a rotating four-claw lotus gripper according to claim 2, characterized in that, The transmission mechanism also includes multiple connecting rods (47), one end of each connecting rod (47) is hinged to the nut seat, and the other end is hinged to the upper middle part of the corresponding gripper (51).

4. The positioning mechanism for a rotating four-claw lotus gripper according to claim 1, characterized in that, The pressing assembly (4) includes a receiving plate (44) connected to the driving mechanism, and a pressure plate (46) fixedly installed at the bottom of the receiving plate (44), and an elastic pad (45) is provided between the receiving plate (44) and the pressure plate (46).

5. The positioning mechanism of the rotating four-claw lotus claw according to claim 4, characterized in that, The elastic buffer structure includes a damping sleeve (53) fixed on the fixed plate (52), a sliding rod (55) slidably passing through the damping sleeve (53), and a spring (54) sleeved on the sliding rod (55) and acting between the damping sleeve (53) and the sliding rod (55); the positioning shovel (56) is fixedly installed at the end of the sliding rod (55).

6. The positioning mechanism of a rotating four-claw lotus claw according to claim 1, characterized in that, The positioning shovel (56) is an L-shaped plate with a guide inclined surface on the side of its bottom facing the center of the mechanism.

7. The positioning mechanism of a rotating four-claw lotus claw according to claim 1, characterized in that, The gripper (51) has a V-shaped groove on its side to increase friction.

8. The positioning mechanism of the rotating four-claw lotus claw according to claim 4, characterized in that, The elastic pad (45) has an air cushion structure.

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