A kind of overhead crane weight limit device

Abstract

The utility model discloses a crane weight limit device, which belongs to the crane weight limit field. The utility model includes a limit structure, a mounting component is installed on the outside of the weight, and a fixing component is threadedly connected to the middle end of the mounting component. The mounting component includes a U-shaped rod A and a U-shaped rod B installed on one side of the U-shaped rod A, and the U-shaped rod B and the U-shaped rod A are cross-mounted. The utility model inserts one end of a T-shaped rotating rod into the inside of a central threaded hole, is threadedly connected to the inside of the central threaded hole, rotates the T-shaped rotating rod, and uses the fixing component to install the mounting component on the side end of the weight. The removal and installation of the weight can be completed in a few minutes, thereby improving the inspection and maintenance efficiency of the pull rope replacement. The entire device is small in size and does not require the use of auxiliary tools. The spliced ​​weight has a simple structure and has the advantages of low cost and strong practicality.

Description

Technical Field

[0001] The utility model belongs to the field of overhead crane weight limiting, in particular to an overhead crane weight limiting device. Background Art

[0002] Double-beam bridge cranes are also called overhead cranes. To ensure their safe operation and avoid accidents, the overhead cranes are equipped with a rising limit device, which can automatically cut off the power supply when the hook assembly rises to the limit position to prevent the hook assembly from over-hoisting and breaking the wire rope, causing the hoisting equipment to fall and cause accidents.

[0003] In the existing weight limiter, the weight is fixed to the crane wire rope using a U-shaped ring and bolts during installation. Two people are required for the installation. After the person below fixes the weight to the wire rope with the U-shaped ring and bolts, the person above must use a rope to pull it to the trolley and then connect it to the limiter. This takes 30 minutes and is time-consuming and laborious.

[0004] Therefore, we propose a crane weight limit device to solve the above problems. Utility Model Content

[0005] In view of the above problems existing in the prior art, the purpose of the utility model is to provide a crane weight limiting device.

[0006] In order to solve the above problems, the technical solution adopted by the utility model is as follows: a heavy hammer limit device for a crane, comprising a limit structure, the limit structure comprising a trolley and a rope wheel movably installed inside the trolley, a pull rope is wound around the outer surface of the rope wheel, a hook group is installed at the middle end of the pull rope, a heavy hammer is installed on the outer surface of the hook group and on one side of the hook group, a mounting member is installed on the outer side of the heavy hammer, and a fixing member is threadedly connected to the middle end of the mounting member;

[0007] The side end of the weight hammer is provided with a vertical slot and a horizontal slot, and two groups of the vertical slot and the horizontal slot are provided;

[0008] The mounting component includes a U-shaped rod A and a U-shaped rod B mounted on one side of the U-shaped rod A, and the U-shaped rod B and the U-shaped rod A are mounted crosswise with each other.

[0009] Preferably, the two groups of vertical slots and transverse slots are opened in a cross shape on the outside of the weight, and a median threaded hole is opened on one side where the two groups of vertical slots and transverse slots intersect.

[0010] Preferably, a central threaded hole is provided through the intersection of the U-shaped rod A and the U-shaped rod B, and the fixing member is threadedly connected inside the central threaded hole.

[0011] Preferably, the fixing member includes a T-shaped rotating rod and a mounting thread groove formed at the rear end of the T-shaped rotating rod.

[0012] Preferably, a connecting thread groove is formed on the outer surface of the fixing member and at one end away from the installation thread groove.

[0013] Preferably, the diameter of one end of the T-shaped rotating rod with the installation thread groove is smaller than the diameter of the T-shaped rotating rod with the connection thread groove.

[0014] Compared with the prior art, the beneficial effects of the utility model are:

[0015] (1) The utility model discloses a crane weight limit device. When the crane hook assembly is lifted to a set height, the collision mechanism on the hook assembly lifts the weight, causing the pull rope of the suspended weight to loosen and no longer be tightened, thereby triggering the limit switch to operate, disconnecting the circuit, and causing the hook assembly to no longer move upward, thereby limiting the maximum lifting height. When the hook assembly moves downward and no longer lifts the weight, the pull rope of the suspended weight is tightened again, triggering the limit switch to operate, closing the circuit again, and restoring the weight limiter to normal.

[0016] (2) The utility model provides a crane weight limit device, in which one end of a T-shaped rotating rod is inserted into the interior of a central threaded hole and is threadedly connected to the interior of the central threaded hole. The T-shaped rotating rod is rotated, and the mounting component is mounted on the side end of the weight using a fixing component. The removal and installation of the weight can be completed in a few minutes, thereby improving the inspection and maintenance efficiency of the pull rope replacement. The entire device is small in size and does not require the use of auxiliary tools. The spliced ​​weight has a simple structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0018] Figure 2 It is a top view of the heavy hammer of the utility model;

[0019] Figure 3 This is a schematic diagram of the heavy hammer structure of the utility model;

[0020] Figure 4 It is a schematic diagram of the structure of the installation component and the fixing component of the utility model.

[0021] In the figure: 1. limit structure; 11. hook assembly; 12. pull rope; 13. weight; 131. vertical slot; 132. mid-position threaded hole; 133. transverse slot; 14. trolley; 15. rope pulley; 16. mounting member; 161. U-shaped rod A; 162. U-shaped rod B; 163. mid-position threaded hole; 17. fixing member; 171. T-shaped rotating rod; 172. connecting threaded groove; 173. mounting threaded groove. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0023] Example 1: Please refer to Figure 1 and Figure 2 A crane weight limiting device comprises a limiting structure 1, wherein the limiting structure 1 comprises a trolley 14 and a rope pulley 15 movably installed inside the trolley 14, a pull rope 12 is wound around the outer surface of the rope pulley 15, a hook group 11 is installed at the middle end of the pull rope 12, a weight 13 is installed on the outer surface of the hook group 11 and on one side of the hook group 11, a mounting component 16 is installed on the outer side of the weight 13, and a fixing component 17 is threadedly connected to the middle end of the mounting component 16.

[0024] In this embodiment: the limiter is fixed at the terminal position of the overhead crane lifting rope 12, one end of the rope is connected to the pull rod of the limiter, and the other end of the rope is connected to the weight 13. It is only necessary to wrap the rope 12 around the middle of the two groups of crossed U-shaped rods on the weight 13. When the hook group 11 of the overhead crane is lifted to the set height, the collision mechanism on the hook group 11 will lift the weight 13, so that the rope 12 suspending the weight 13 is loosened and no longer tensioned, thereby triggering the limit switch to operate, the circuit is disconnected, and the hook group 11 no longer moves upward, which plays a role in limiting the maximum lifting height. When the hook group 11 moves downward and no longer lifts the weight 13, the rope 12 suspending the weight 13 is tensioned again, triggering the limit switch to operate, the circuit is reclosed, and the weight-type limiter returns to normal.

[0025] Example 2: Please refer to Figure 3 and Figure 4 A vertical slot 131 and a horizontal slot 133 are provided at the side end of the weight 13, and two groups of the vertical slot 131 and the horizontal slot 133 are provided.

[0026] The mounting component 16 includes a U-shaped rod A161 and a U-shaped rod B162 installed on one side of the U-shaped rod A161, and the U-shaped rod B162 and the U-shaped rod A161 are installed crosswise with each other, and the tail ends of the U-shaped rod A161 and the U-shaped rod B162 are respectively inserted into the vertical slot 131 and the horizontal slot 133, so that the pull rope 12 can be wrapped around the outside of the U-shaped rod A161 and the U-shaped rod B162.

[0027] The two groups of vertical slots 131 and transverse slots 133 are cross-shaped and arranged on the outside of the weight 13. A median threaded hole 132 is arranged on one side where the two groups of vertical slots 131 and transverse slots 133 intersect, so as to facilitate the fixing member 17 to be threadedly connected to the inside of the median threaded hole 132 to fix the mounting member 16.

[0028] A central threaded hole 163 is formed through the intersection of the U-shaped rod A161 and the U-shaped rod B162 , and the fixing member 17 is threadedly connected to the inside of the central threaded hole 163 to fix the mounting member 16 to the side end of the heavy hammer 13 .

[0029] The fixing member 17 includes a T-shaped rotating rod 171 and a mounting thread groove 173 provided at the rear end of the T-shaped rotating rod 171 . One end of the T-shaped rotating rod 171 provided with the mounting thread groove 173 is threadedly connected to the inside of the middle thread hole 132 to install the mounting member 16 .

[0030] A connecting thread groove 172 is formed on the outer surface of the fixing member 17 and at one end away from the mounting thread groove 173 . One end of the T-shaped rotating rod 171 having the connecting thread groove 172 is threadedly connected to the inside of the central thread hole 163 to maintain the stability of the mounting member 16 .

[0031] The diameter of one end of the T-shaped rotating rod 171 with the installation thread groove 173 is smaller than the diameter of the T-shaped rotating rod 171 with the connection thread groove 172 , so as to facilitate the rotation of the rotating fixing member 17 .

[0032] In this embodiment: one end of a T-shaped rotating rod 171 with an installation threaded groove 173 is inserted into the interior of the central threaded hole 163 and is threadedly connected to the interior of the median threaded hole 132. The T-shaped rotating rod 171 is rotated, and the mounting member 16 is installed on the side end of the weight 13 using the fixing member 17. Conversely, the fixing member 17 is rotated out from the interior of the median threaded hole 132. A single person can complete the removal and installation of the weight 13 in a few minutes, thereby improving the inspection and maintenance efficiency of the replacement of the pull rope 12. The entire device is small in size and does not require the use of auxiliary tools. The spliced ​​weight has a simple structure, low cost, can be made from local materials, can be made by oneself, is highly practical, reduces the labor intensity of maintenance personnel, and effectively promotes safe production.

[0033] Working principle: One end of the T-shaped rotating rod 171 is inserted into the interior of the central threaded hole 163 and is threadedly connected to the interior of the central threaded hole 132. The T-shaped rotating rod 171 is rotated, and the mounting component 16 is installed on the side end of the heavy hammer 13 using the fixing component 17. The removal and installation of the heavy hammer 13 can be completed in a few minutes, thereby improving the inspection and maintenance efficiency of the replacement of the pull rope 12. The entire device is small in size and does not require the use of auxiliary tools. The spliced ​​heavy hammer has a simple structure.

[0034] The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in this field.

[0035] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art may still modify the technical solutions described in the aforementioned embodiments, or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A crane weight limit device, comprising a limit structure (1), characterized in that: The limiting structure (1) comprises a trolley (14) and a rope wheel (15) movably mounted inside the trolley (14); a pull rope (12) is wound around the outer surface of the rope wheel (15); a hook group (11) is mounted at the middle end of the pull rope (12); a weight (13) is mounted on the outer surface of the hook group (11) and on one side of the hook group (11); a mounting member (16) is mounted on the outer side of the weight (13); and a fixing member (17) is threadedly connected to the middle end of the mounting member (16); The side end of the weight (13) is provided with a vertical slot (131) and a transverse slot (133), and the vertical slot (131) and the transverse slot (133) are both provided with two groups; The mounting member (16) comprises a U-shaped rod A (161) and a U-shaped rod B (162) mounted on one side of the U-shaped rod A (161), and the U-shaped rod B (162) and the U-shaped rod A (161) are mounted crosswise with each other.

2. The overhead crane weight limiting device according to claim 1, characterized in that: The two groups of vertical slots (131) and transverse slots (133) are arranged in a cross shape on the outside of the weight (13), and a middle threaded hole (132) is arranged on one side where the two groups of vertical slots (131) and transverse slots (133) intersect.

3. The overhead crane weight limiting device according to claim 1, characterized in that: A central threaded hole (163) is provided through the intersection of the U-shaped rod A (161) and the U-shaped rod B (162), and the fixing member (17) is threadedly connected inside the central threaded hole (163).

4. The overhead crane weight limiting device according to claim 1, characterized in that: The fixing member (17) comprises a T-shaped rotating rod (171) and a mounting threaded groove (173) formed at the rear end of the T-shaped rotating rod (171).

5. The overhead crane weight limiting device according to claim 4, characterized in that: A connecting thread groove (172) is formed on the outer surface of the fixing member (17) and at one end away from the mounting thread groove (173).

6. The overhead crane weight limiting device according to claim 5, characterized in that: The diameter of one end of the T-shaped rotating rod (171) provided with the installation thread groove (173) is smaller than the diameter of the T-shaped rotating rod (171) provided with the connection thread groove (172).

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