A new type of rising protection limiting device special for grab bucket

Abstract

This utility model relates to the field of grab bucket lifting protection limit technology, and discloses a novel grab bucket-specific lifting protection limit device, which includes a grab bucket trolley frame. A first rectangular tube is provided on one side of the lower end of the grab bucket trolley frame. Mounting plates are provided on both sides of the upper end of the first rectangular tube. A connecting hole is provided in the middle of the mounting plate. A second rectangular tube is provided on one side of the lower end of the first rectangular tube. A connecting pin is provided at the connection position between the first rectangular tube and the second rectangular tube. A counterweight is welded to the second rectangular tube, which is connected to the first rectangular tube by the connecting pin. This effectively avoids the lifting limit protection failure caused by the counterweight swinging back and forth due to the inertia of the crane. At the same time, the device keeps the counterweight away from the main hoisting wire rope, and also avoids the traction wire rope from getting entangled with the main wire rope, thus preventing damage to the hook assembly and causing a major safety accident.

Description

Technical Field

[0001] This utility model belongs to the field of grab bucket lifting protection limit technology, specifically a new type of grab bucket dedicated lifting protection limit device. Background Technology

[0002] The national standard "TSG51 - Safety Technical Specifications for Special Equipment" specifies that bridge cranes and gantry cranes must be equipped with two different types of height limit devices, such as counterweight type, flameout type, and pressure plate type height limiters. Due to the special mechanism of commonly used four-rope grab buckets and electro-hydraulic grab buckets, previous grab bucket cranes only installed conventional cam-type height limiters for protection. Often, due to production efficiency and urgent delivery, the installation of the secondary counterweight protection of the grab bucket's lifting mechanism was omitted, or the counterweight style was imitated from that of ordinary bridge cranes. The secondary lifting protection limiter of a crane generally needs to be installed at the end of a fixed rope. However, the four main steel wire ropes of the grab bucket's lifting and opening / closing drums are all moving ropes, so the secondary lifting protection limiter cannot currently be directly installed on the grab bucket structure.

[0003] Furthermore, the grab bucket's unique design, using a heavy iron block that impacts the fixing rope, can cause the iron block to sway due to the lifting inertia, leading to limit failure and increased danger. Therefore, developing a simple and reliable new grab bucket-specific lifting protection limit device is crucial. The crane heavy iron lifting limit device with publication number CN105776029A suffers from the aforementioned problems. To address this, a novel grab bucket-specific lifting protection limit device is proposed here. Utility Model Content

[0004] In view of the above situation and to overcome the defects of the prior art, this utility model provides a new type of grab bucket-specific lifting protection limit device, which effectively solves the problems existing in the existing crane hammer-type lifting limit device.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a novel grab bucket-specific lifting protection limit device, comprising a grab bucket trolley frame, a first rectangular tube provided on one side of the lower end of the grab bucket trolley frame, mounting plates provided on both sides of the upper end of the first rectangular tube, a connecting hole provided in the middle of the mounting plate, a second rectangular tube provided on one side of the lower end of the first rectangular tube, a connecting pin provided at the connection position between the first rectangular tube and the second rectangular tube, a counterweight iron block provided on the upper part of the second rectangular tube away from the first rectangular tube, a pulling steel wire rope provided on the upper end of the counterweight iron block, a mechanical limit switch provided on the upper end of the pulling steel wire rope, a grab bucket provided below the second rectangular tube, and a main steel wire rope provided on the upper end of the grab bucket.

[0006] Preferably, the two mounting plates are formed on both sides of the upper end of the first rectangular tube, the connecting hole is formed in the middle of the mounting plate, and the mounting plate is connected to the lower end of the grab bucket trolley frame by bolts. The mounting plate can be installed and fixed to the lower end of the grab bucket trolley frame by using bolts through the connecting hole, thereby fixing the first rectangular tube to the lower end of the grab bucket trolley frame.

[0007] Preferably, the connecting pin passes through the first rectangular tube and the second rectangular tube, and the second rectangular tube is rotatably connected to the first rectangular tube through the connecting pin. The second rectangular tube can rotate with the first rectangular tube through the connecting pin. The specifications of the second rectangular tube and the first rectangular tube are both 40mm*40mm*2mm. The length of the first rectangular tube is 1m, and the length of the second rectangular tube is 1.5m. The lengths of the first rectangular tube and the second rectangular tube can be adjusted according to the site conditions.

[0008] Preferably, the lower end of the counterweight is welded to the upper end of the second rectangular tube, and the lower end of the pulling wire rope is wound and connected to the upper end of the counterweight. The length of the pulling wire rope is 2m, and its length can also be adjusted according to the site conditions.

[0009] Preferably, the upper end of the pulling wire rope is wound and connected to the travel motion component on the mechanical limit switch, and the lower end of the mechanical limit switch is bolted to the upper end of the grab bucket trolley frame. When the pulling wire rope is tensioned under the gravity of the weighted iron block and the second rectangular tube, the travel motion component on the mechanical limit switch will contact the contact, thus connecting the crane grab bucket lifting protection circuit. When the pulling wire rope changes to a slack state, the travel motion component on the mechanical limit switch will separate from the contact under the action of the spring, thereby disconnecting the crane grab bucket lifting protection circuit. The lifting protection limit will then disconnect, allowing the crane to stop the lifting operation of the grab bucket in time, thus achieving lifting protection.

[0010] Preferably, the main wire rope is the pulling rope of the grab bucket trolley, and the lower end of the main wire rope is fixed together with the upper end of the grab bucket by a wire rope clamp. The crane can pull the grab bucket to lift and lower by the main wire rope.

[0011] Compared with the prior art, the beneficial effects of this utility model are:

[0012] In this new grab bucket-specific lifting protection limit device, the counterweight is welded to the second rectangular tube, which is connected to the first rectangular tube via a connecting pin. This effectively prevents the lifting limit protection from failing due to the counterweight's back-and-forth swinging caused by the crane's inertia. Simultaneously, the device keeps the counterweight away from the main hoisting wire rope, preventing the traction wire rope from tangling with the main wire rope and thus preventing damage to the hook assembly and potential major safety accidents. Using the traction wire rope to connect the mechanical limit switch and the counterweight avoids the grab bucket impacting the limit structure, which could cause the counterweight to sway and fail, leading to even greater danger. This device is safe, reliable, simple in structure, easy to install, and highly versatile, suitable for most grab bucket lifting mechanisms. Attached Figure Description

[0013] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0014] Fig. 1 This is a schematic diagram of the structure of this utility model;

[0015] Fig. 2 This is a schematic diagram of the connection structure of the first rectangular tube, the second rectangular tube, and the counterweight block in this utility model;

[0016] Fig. 3 This is a schematic diagram of the structure of the first rectangular tube in this utility model;

[0017] In the diagram: 1. Grab bucket trolley frame; 2. First rectangular tube; 3. Mounting plate; 4. Connecting hole; 5. Second rectangular tube; 6. Connecting pin; 7. Counterweight block; 8. Pulling wire rope; 9. Mechanical limit switch; 10. Grab bucket; 11. Main wire rope. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0019] In this embodiment, by Figs. 1-3The present invention includes a grab bucket trolley frame 1, a first rectangular tube 2 is provided on one side of the lower end of the grab bucket trolley frame 1, mounting plates 3 are provided on both sides of the upper end of the first rectangular tube 2, a connecting hole 4 is provided in the middle of the mounting plate 3, a second rectangular tube 5 is provided on one side of the lower end of the first rectangular tube 2, a connecting pin 6 is provided at the connection position between the first rectangular tube 2 and the second rectangular tube 5, a counterweight block 7 is provided on the upper part of the end of the second rectangular tube 5 away from the first rectangular tube 2, a pulling steel wire rope 8 is provided on the upper end of the counterweight block 7, a mechanical limit switch 9 is provided on the upper end of the pulling steel wire rope 8, a grab bucket 10 is provided below the second rectangular tube 5, and a main steel wire rope 11 is provided on the upper end of the grab bucket 10.

[0020] Two mounting plates 3 are formed on both sides of the upper end of the first rectangular tube 2, and connecting holes 4 are formed in the middle of the mounting plates 3. The mounting plates 3 are connected to the lower end of the grab bucket trolley frame 1 by bolts. The mounting plates 3 can be installed and fixed to the lower end of the grab bucket trolley frame 1 by using bolts through the connecting holes 4, thereby fixing the first rectangular tube 2 to the lower end of the grab bucket trolley frame 1.

[0021] The connecting pin 6 passes through the first rectangular tube 2 and the second rectangular tube 5. The second rectangular tube 5 and the first rectangular tube 2 are rotatably connected by the connecting pin 6. The second rectangular tube 5 can rotate with the first rectangular tube 2 through the connecting pin 6. The specifications of the second rectangular tube 5 and the first rectangular tube 2 are both 40mm*40mm*2mm. The length of the first rectangular tube 2 is 1m and the length of the second rectangular tube 5 is 1.5m. The lengths of the first rectangular tube 2 and the rectangular tubes can be adjusted according to the site conditions.

[0022] The lower end of the heavy iron block 7 is welded to the upper end of the second rectangular tube 5, and the lower end of the pulling steel wire rope 8 is wound and connected to the upper end of the heavy iron block 7. The length of the pulling steel wire rope 8 is 2m, and its length can also be adjusted according to the site conditions.

[0023] The upper end of the traction wire rope 8 is wound and connected to the travel motion component on the mechanical limit switch 9, and the lower end of the mechanical limit switch 9 is connected to the upper end of the grab bucket trolley frame 1 by bolts. When the traction wire rope 8 is tensioned under the gravity of the counterweight 7 and the second rectangular tube 5, the travel motion component on the mechanical limit switch 9 will contact the contact, thus connecting the lifting protection circuit of the crane grab bucket 10. When the traction wire rope 8 changes to a slack state, the travel motion component on the mechanical limit switch 9 will separate from the contact under the action of the spring, thereby disconnecting the lifting protection circuit of the crane grab bucket 10. The lifting protection limit will then disconnect, allowing the crane to stop the lifting operation of the grab bucket 10 in time, thus achieving lifting protection.

[0024] Among them, the main wire rope 11 is the pulling rope of the grab bucket trolley. The lower end of the main wire rope 11 is fixed to the upper end of the grab bucket 10 by a wire rope clamp. The crane can pull the grab bucket 10 to lift and lower by the main wire rope 11.

[0025] Working Principle: The device operates using power supplied by a crane. During the lifting mechanism of the crane's grab bucket 10, under normal conditions, the tension wire rope 8 is tensioned by the weight of the counterweight block 7 and the second rectangular tube 5. This causes the upper travel movement component of the mechanical limit switch 9 to contact the contactor, activating the lifting protection circuit of the crane grab bucket 10. As the lifting mechanism of the grab bucket 10 continues to rise, the top mechanical mechanism of the grab bucket 10 will reach the upper limit position and touch the second rectangular tube 5. At this time, the second rectangular tube 5 will rotate upwards via the connecting pin 6, relying on the first rectangular tube 2, causing the tension wire rope 8 to slack off. This triggers the pull-down state of the mechanical limit switch 9. When the movement of the upper travel component changes, it will separate from the contact under the action of the spring, thereby disconnecting the lifting protection circuit of the crane grab bucket 10. The lifting protection limit will also disconnect, allowing the crane to stop the lifting operation of the grab bucket 10 in time, thus achieving lifting protection. The counterweight block 7 is welded to the second rectangular tube 5, which is connected to the first rectangular tube 2 through the connecting pin 6. This can effectively prevent the lifting limit protection from failing due to the back-and-forth swing of the counterweight block caused by the inertia of the crane. At the same time, the device keeps the counterweight block 7 away from the main hoisting wire rope 11, which can also prevent the traction wire rope 8 from getting tangled with the main wire rope 11, thus preventing damage to the hook assembly and causing a major safety accident. This device is safe, reliable, simple in structure, easy to install, and highly versatile, suitable for most grab bucket 10 type lifting mechanisms.

[0026] It should be noted that, in this document, relational terms such as "first" and "second" are used only 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 process, method, article, or apparatus.

[0027] 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 novel grab bucket-specific lifting protection limit device, comprising a grab bucket trolley frame (1), characterized in that: The grab trolley frame (1) has a first rectangular tube (2) on one side of its lower end. The first rectangular tube (2) has mounting plates (3) on both sides of its upper end. The mounting plates (3) have a connecting hole (4) in the middle. The first rectangular tube (2) has a second rectangular tube (5) on one side of its lower end. The first rectangular tube (2) and the second rectangular tube (5) are connected by a connecting pin (6). The second rectangular tube (5) has a heavy iron block (7) on its upper part away from the first rectangular tube (2). The heavy iron block (7) has a pulling steel wire rope (8) on its upper end. The pulling steel wire rope (8) has a mechanical limit switch (9) on its upper end. The grab bucket (10) is located below the second rectangular tube (5). The grab bucket (10) has a main steel wire rope (11) on its upper end.

2. The novel grab bucket-specific lifting protection limit device according to claim 1, characterized in that: Two mounting plates (3) are formed on both sides of the upper end of the first rectangular tube (2), and the connecting hole (4) is formed in the middle of the mounting plate (3). The mounting plate (3) is connected to the lower end of the grab bucket trolley frame (1) by bolts.

3. The novel grab bucket-specific lifting protection limit device according to claim 1, characterized in that: The connecting pin (6) passes through the first rectangular tube (2) and the second rectangular tube (5), and the second rectangular tube (5) and the first rectangular tube (2) are rotatably connected by the connecting pin (6).

4. The novel grab bucket-specific lifting protection limit device according to claim 1, characterized in that: The lower end of the heavy iron block (7) is welded to the upper end of the second rectangular tube (5), and the lower end of the pulling steel wire rope (8) is wound and connected to the upper end of the heavy iron block (7).

5. A novel grab bucket-specific lifting protection limit device according to claim 1, characterized in that: The upper end of the traction wire rope (8) is wound and connected to the travel movement component on the mechanical limit switch (9), and the lower end of the mechanical limit switch (9) is connected to the upper end of the grab bucket trolley frame (1) by bolts.

6. The novel grab bucket-specific lifting protection limit device according to claim 1, characterized in that: The main wire rope (11) is the pulling rope of the grab bucket trolley, and the lower end of the main wire rope (11) is fixed together with the upper end of the grab bucket (10) by a wire rope clamp.

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