Buffered grab closure limiter

Abstract

The utility model discloses a buffer formula grab bucket closing positioner, including two limit mechanisms, the limit mechanism is including moving frame, the inside of moving frame is equipped with extrusion block and moving block, the inside of extrusion block and the inside of moving block all are hingedly connected with fixed link, two limit mechanisms are equipped with two grab buckets, fixed link with grab bucket fixed connection, the top rotatable connection of grab bucket has hydraulic pressure link. This buffer formula grab bucket closing positioner, through setting limit mechanism, grab bucket rotation will be with fixed link movement, and fixed link is with extrusion block and moving block movement, and extrusion block and moving block move in the inside of moving frame, can limit the moving position of grab bucket in this way, and the grab bucket is closed conveniently, prevents the grab bucket misplacement.

Description

Technical Field

[0001] This utility model relates to the field of grab bucket closure limit technology, specifically a buffer-type grab bucket closure limit device. Background Technology

[0002] A grab bucket is a special tool used by cranes to grab dry bulk goods. It consists of two or more bucket-shaped jaw plates that can be opened and closed to form a storage space. During loading, the jaw plates close in the material pile, and the material is grabbed into the storage space. During unloading, the jaw plates open while suspended above the material pile, and the material scatters onto the pile.

[0003] A search revealed an existing patent (publication number: CN221971066U) that discloses a grab bucket closing limit alarm device. The device includes an upper beam, a drum mounted at the bottom of the upper beam, a steel wire rope wound on the drum, the lower part of the steel wire rope mounted on a pulley, the pulley mounted on a pulley frame, and the pulley frame mounted on a lower beam. The device is characterized by: connecting shafts mounted at both ends of the lower beam, with a left grab bucket and a right grab bucket hinged to the connecting shafts; hinge shafts hinged to both sides of the sidewall of the left grab bucket, the top of the hinge shafts hinged to the upper beam; an upper plate mounted at the bottom of the drum; vertically arranged displacement sensors mounted on both sides of the bottom of the upper plate, with the bottom surfaces of the displacement sensors spaced apart from the lower beam; and a controller mounted on the top of the lower beam. The displacement sensors at the bottom of the upper plate receive the displacement between themselves and the lower beam, transmitting the displacement signal to the controller to control the opening and closing of the drum.

[0004] Although it limits the tension of the wire rope for closing the grab bucket and protects the wire rope, it has shortcomings. It cannot limit the rotation position of the grab bucket, so the two grab buckets may become misaligned when they close. Utility Model Content

[0005] To address the shortcomings of existing technologies, this utility model provides a buffer-type grab bucket closing limit device, which solves the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model is implemented through the following technical solution: a buffer-type grab bucket closing limit device, comprising two limit mechanisms, each limit mechanism including a movable frame, the interior of which is provided with a squeezing block and a movable block, both the interior of the squeezing block and the interior of the movable block being rotatably connected with a fixed rod, the two limit mechanisms being provided with two grab buckets, the fixed rod being fixedly connected to the grab buckets, and the top of the grab buckets being rotatably connected with a hydraulic rod; A fixed plate is rotatably connected to the top of the hydraulic rod, and four connecting rods are fixed to the bottom of the fixed plate. A round rod is fixed inside the connecting rod, and two connecting blocks are rotatably connected to the outer wall of the round rod. Two grabs are provided below the round rod, and the bottom end of the connecting block is fixedly connected to the grab. Two hydraulic rods are rotatably connected to the top of the fixed plate, and the output shaft of the hydraulic rod is rotatably connected to the grab.

[0007] Preferably, a pressure sensor is fixed to the left side of the moving block, and a PLC is fixed to the top of the grab bucket on the right side.

[0008] Preferably, a fixing cylinder is fixed on both the left and right sides of the fixing plate, and a limit rod is slidably connected inside the fixing cylinder.

[0009] Preferably, the top and bottom of the moving block and the extrusion block are provided with grooves, and two rollers are rotatably connected inside the grooves.

[0010] Preferably, the roller is made of rubber. Beneficial effects

[0011] This utility model provides a buffer-type grab bucket closing limit device. Compared with the prior art, it has the following advantages: This buffer-type grab bucket closing limit device, by setting a limit mechanism, causes the fixed rod to move when the grab bucket rotates, and the fixed rod moves the squeezing block and the moving block. The squeezing block and the moving block move inside the moving frame, which can limit the movement position of the grab bucket, facilitate the closure of the grab bucket, and prevent the grab bucket from being misaligned. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of the limiting mechanism in this utility model; Figure 3 This is a schematic diagram of the structure of the movable block in this utility model.

[0013] In the diagram: 1. Limiting device; 101. Groove; 102. Roller; 103. Extrusion block; 104. Fixed rod; 105. Moving block; 106. Pressure sensor; 107. Moving frame; 2. Grab bucket; 3. PLC; 4. Round rod; 5. Fixed cylinder; 6. Connecting block; 7. Hydraulic rod; 8. Fixed plate; 9. Limiting rod; 10. Connecting rod. Detailed Implementation

[0014] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0015] Please see Figures 1-3 This utility model provides a technical solution: a buffer-type grab bucket closing limit device, including two limit mechanisms 1. Each limit mechanism 1 includes a movable frame 107, inside which are a pressing block 103 and a movable block 105. A fixed rod 104 is rotatably connected inside both the pressing block 103 and the movable block 105. The two limit mechanisms 1 have two grab buckets 2, with the fixed rod 104 fixedly connected to the grab buckets 2. A hydraulic rod 7 is rotatably connected to the top of the grab bucket 2, and a fixed plate 8 is rotatably connected to the top of the hydraulic rod 7. Four connecting rods 10 are fixed to the bottom of the fixed plate 8. A round rod 4 is fixed inside the connecting rod 10. Two connecting blocks 6 are rotatably connected to the outer wall of the round rod 4. Two grab buckets 2 are provided below the round rod 4. The bottom end of the connecting block 6 is fixedly connected to the grab bucket 2. Two hydraulic rods 7 are rotatably connected to the top of the fixing plate 8. The output shaft of the hydraulic rod 7 is rotatably connected to the grab bucket 2. This allows the grab buckets 2 to be stacked for limiting and fixing. A pressure sensor 106 is fixed to the left side of the moving block 105. A PLC 3 is fixed to the top of the grab bucket 2 on the right side. This can limit the rotation position of the grab bucket 2, facilitate the closing of the grab bucket 2, and prevent misalignment after the grab bucket 2 is closed.

[0016] Furthermore, fixing cylinders 5 are fixed on both the left and right sides of the fixing plate 8. The fixing cylinder 5 is slidably connected to a limit rod 9, so that the moving frame 107 is located between the two grabs 2. The top and bottom of the moving block 105 and the extrusion block 103 are provided with grooves 101. Two rollers 102 are rotatably connected inside the grooves 101, which facilitates the movement of the moving block 105 and the extrusion block 103 inside the moving frame 107. The rollers 102 are made of rubber, so as not to cause wear to the moving frame 107.

[0017] During operation, the hydraulic rods 7 are activated, and the two hydraulic rods 7 push the grab bucket 2 to rotate. The rotation of the grab bucket 2 will move the fixed rod 104, which in turn moves the squeezing block 103 and the moving block 105. The squeezing block 103 and the moving block 105 move inside the moving frame 107, which can limit the movement position of the grab bucket 2, facilitate the closing of the grab bucket 2, and prevent the grab bucket 2 from being misaligned. After the grab bucket 2 closes, the squeezing block 103 and the moving block 105 close together. The squeezing block 103 squeezes the pressure sensor 106. The pressure sensor 106 senses the pressure and sends a signal to the PLC 3. The PLC 3 shuts down the hydraulic rods 7 to prevent the hydraulic rods 7 from continuing to contract and causing the grab bucket 2 to close and be squeezed and damaged.

[0018] The pressure sensor uses a BCM-H3 stainless steel pressure sensor from Bengchuan. The pressure sensor utilizes the piezoresistive effect, where the resistance of a material (such as a semiconductor or metal strain gauge) changes when it is compressed. Pressure acts on the sensitive element (such as a silicon diaphragm), causing the strain gauge to deform. This change in resistance is converted into a voltage signal via a Wheatstone bridge circuit. The PLC used is a Siemens S7-200smartPLC. The PLC operates on the principle of infinite loop scanning, continuously monitoring input signals and executing corresponding output operations according to preset program logic. The PLC receives input signals from switches and sensors, makes decisions and judgments based on its internally stored program, and then automates the operation of machines and processes through control outputs.

[0019] Furthermore, any content not described in detail in this specification is existing technology known to those skilled in the art.

[0020] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, the phrase "comprising an element defined as..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0021] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A buffer-type grab bucket closing limit device, comprising two limit mechanisms (1), characterized in that: The limiting mechanism (1) includes a movable frame (107), inside which are provided a pressing block (103) and a movable block (105). The inside of the pressing block (103) and the inside of the movable block (105) are rotatably connected to a fixed rod (104). The two limiting mechanisms (1) are provided with two grabs (2). The fixed rod (104) and the grabs (2) are fixedly connected. The top of the grabs (2) is rotatably connected to a hydraulic rod (7). The top of the hydraulic rod (7) is rotatably connected to a fixed plate (8), and the bottom of the fixed plate (8) is fixed with four connecting rods (10). A round rod (4) is fixed inside the connecting rod (10), and two connecting blocks (6) are rotatably connected to the outer wall of the round rod (4). Two grabs (2) are provided below the round rod (4). The bottom end of the connecting block (6) is fixedly connected to the grab (2). The top of the fixed plate (8) is rotatably connected to two hydraulic rods (7), and the output shaft of the hydraulic rod (7) is rotatably connected to the grab (2).

2. The buffer-type grab bucket closing limit device according to claim 1, characterized in that: A pressure sensor (106) is fixed on the left side of the moving block (105), and a PLC (3) is fixed on the top of the grab bucket (2) on the right side.

3. The buffer-type grab bucket closing limit device according to claim 2, characterized in that: The fixing plate (8) is fixed with fixing cylinders (5) on both the left and right sides, and the fixing cylinders (5) are slidably connected with limit rods (9).

4. The buffer-type grab bucket closing limit device according to claim 3, characterized in that: The top and bottom of the moving block (105) and the pressing block (103) are provided with grooves (101), and two rollers (102) are rotatably connected inside the grooves (101).

5. The buffer-type grab bucket closing limit device according to claim 4, characterized in that: The roller (102) is made of rubber.

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