Limiting device for heavy hammer of crane

Abstract

The utility model discloses a crane heavy hammer limiting device which comprises a mounting plate, a travel switch is arranged on the mounting plate, a trigger movable arm is rotatably connected to the travel switch, and a baffle is vertically connected to one side of the bottom of the mounting plate; the trigger movable arm is located above the baffle, the other end of the trigger movable arm is connected with a suspension chain, the suspension chain is connected with a heavy hammer, and the trigger movable arm is in lap joint with the edge of the baffle through the downward gravity of the heavy hammer. One end of the upper part of the mounting plate is connected with the anti-dropping hanging chain, the other end of the anti-dropping hanging chain is fixed on the crane, the other end of the upper part of the mounting plate is fixed on a steel wire rope dead rope of a crane hook, and the heavy hammer can be connected on the steel wire rope dead rope of the crane hook in an up-down moving manner. The heavy hammer limiting device has a secondary anti-falling function, so that the heavy hammer limiting device cannot fall off, and danger is avoided; the over-travel protection function of the travel switch can be realized, and the travel switch cannot be damaged; the device is convenient to install, safe, reliable, durable and practical.

Description

Technical Field

[0001] The utility model belongs to the technical field of lifting and limiting of general lifting equipment, and in particular relates to a heavy hammer limiting device for a crane. Background Art

[0002] When the hook of a crane is lifted to a certain height, it needs to stop and cannot continue to lift, otherwise the crane will be damaged. In the prior art, a weight limiter is used to control the lifting of the hook to stop. When the hook is lifted to the position of the weight limiter, the weight limiter is triggered to work, thereby controlling the hook to stop lifting. The traditional weight limiter of a crane is inconvenient to install. In addition, there are the following problems: (1) There is no secondary anti-slip device, which causes the weight limiter to fall frequently and is prone to danger; (2) The travel switch has no over-travel protection, which makes the travel switch easy to be damaged. Utility Model Content

[0003] The utility model aims at the above problems, makes up for the deficiencies of the prior art and provides a crane weight limiting device.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] A crane weight limit device comprises a mounting plate, a travel switch is arranged on the mounting plate, a trigger arm is rotatably connected to the travel switch, and a baffle is vertically connected to one side of the bottom of the mounting plate; the trigger arm is located above the baffle, and the other end of the trigger arm is connected to a suspension chain, and the suspension chain is connected to a weight, and the trigger arm is overlapped on the edge of the baffle through the downward gravity of the weight; one end of the upper part of the mounting plate is connected to an anti-detachment hanging chain, and the other end of the anti-detachment hanging chain is fixed to the crane, and the other end of the upper part of the mounting plate is fixed to the dead rope of the wire rope of the crane hook, and the weight can be moved up and down and connected to the dead rope of the wire rope of the crane hook.

[0006] Furthermore, a connection hole is provided at one end of the upper portion of the mounting plate, and one end of the anti-detachment hanging chain is connected to the connection hole.

[0007] Furthermore, a wire rope clamp for fixing on a dead rope of a wire rope of a crane hook is provided at the other end of the upper portion of the mounting plate, and the wire rope clamp is fixed to the mounting plate by bolts.

[0008] Furthermore, a through hole is provided at the other end of the trigger arm, a locking hook ring is provided at one end of the suspension chain, and the suspension chain is connected to the through hole of the trigger arm through the locking hook ring.

[0009] Furthermore, the weight is provided with a first connecting ring and a second connecting ring, the first connecting ring is connected to the upper part of the weight through a fixing pin, and the second connecting ring is connected to the weight below the first connecting ring through bolts.

[0010] Furthermore, the first connecting ring and the second connecting ring are both U-shaped, the first connecting ring is connected to the other end of the suspension chain, and the second connecting ring is sleeved on the dead rope of the wire rope of the crane hook.

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

[0012] The crane weight limit device provided by the utility model has a secondary anti-drop function through the anti-drop hanging chain, which will not cause the weight limit device to fall, thus avoiding danger; through the cooperation between the mounting plate with the baffle and the travel switch, the overtravel protection function of the travel switch can be realized, and the travel switch will not be damaged. In addition, the crane weight limit device of the utility model can be conveniently installed on the dead rope of the wire rope of the crane hook through the wire rope clamp, which is safe, reliable, durable and practical. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 The utility model is a front view structural schematic diagram of a crane weight limiting device.

[0014] Figure 2 The utility model is a schematic diagram of the side view of a crane weight limiting device.

[0015] Markings in the figure: 1 is a mounting plate, 2 is a travel switch, 3 is an anti-dropping hanging chain, 4 is a wire rope clamp, 5 is a heavy hammer, 6 is a suspension chain, 7 is a trigger boom, 8 is a first connecting ring, 9 is a baffle, 10 is a through hole, 11 is a connecting hole, 12 is a locking hook ring, 13 is a second connecting ring, 14 is a fixing pin, 15 is a wire rope dead rope of a crane hook, and 16 is a bolt. DETAILED DESCRIPTION

[0016] 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.

[0017] Combination Figure 1 and Figure 2As shown, an embodiment of the utility model provides a crane weight limit device, including a mounting plate 1, on which a travel switch 2 is arranged, on which a trigger arm 7 is rotatably connected, and a baffle 9 is vertically connected to one side of the bottom of the mounting plate 1; the trigger arm 7 is located above the baffle 9, and the other end of the trigger arm 7 is connected to a suspension chain 6, and the suspension chain 6 is connected to a weight 5, and the trigger arm 7 is overlapped on the edge of the baffle 9 by the downward gravity of the weight 5; one end of the upper part of the mounting plate 1 is connected to an anti-detachment chain 3, and the other end of the anti-detachment chain 3 is fixed to the crane, and the other end of the upper part of the mounting plate 1 is fixed to a steel wire rope dead rope 15 of a crane hook, and the weight 5 can be moved up and down and connected to the steel wire rope dead rope 15 of the crane hook; wherein, the anti-detachment chain 3 is used for the secondary anti-detachment of the overall crane weight limit device of the utility model.

[0018] Specifically, a connection hole 11 is provided at one end of the upper portion of the mounting plate 1, and one end of the anti-drop chain 3 is connected to the connection hole 11; a wire rope clamp 4 is provided at the other end of the upper portion of the mounting plate 1, and the wire rope clamp 4 is fixed to the mounting plate 1 by a bolt 16; the wire rope clamp 4 is used to fix the mounting plate 1 to the wire rope dead rope 15 of the crane hook, and the model of the wire rope clamp 4 matches the wire rope dead rope 15 of the crane hook in use. Among them, the mounting plate 1 serves as the installation body of the travel switch 2, the wire rope clamp 4, the anti-drop chain 3, and the weight 5. The mounting plate 1 cooperates with the trigger arm 7 of the travel switch 2 through the connected baffle 9 to realize the overtravel protection function of the travel switch 2; the travel switch 2, as the electrical control body, has a large travel and a large overtravel buffer zone to which the trigger arm 7 is connected.

[0019] Specifically, a through hole 10 is provided at the other end of the trigger arm 7 , a lock hook ring 12 is provided at one end of the suspension chain 6 , and the suspension chain 6 is connected to the through hole 10 of the trigger arm 7 via the lock hook ring 12 .

[0020] Specifically, the weight 5 is provided with a first connecting ring 8 and a second connecting ring 13. The first connecting ring 8 is connected to the upper part of the weight 5 through a fixing pin 14. The second connecting ring 13 is connected to the weight 5 below the first connecting ring 8 through a bolt 16. The first connecting ring 8 and the fixing pin 14 are fixedly connected by threads. The first connecting ring 8 and the second connecting ring 13 are both U-shaped. The first connecting ring 8 is connected to the other end of the suspension chain 6, and the second connecting ring 13 is sleeved on the steel wire rope dead rope of the crane hook. The weight 5 is used as the triggering power of the travel switch 2. Through the second connecting ring 13, the weight 5 can move up and down along the steel wire rope dead rope 15 of the crane hook without deviating from the steel wire rope dead rope 15 of the crane hook, which plays a guiding role.

[0021] Combined with the technical solution of the utility model and Figure 1 and Figure 2 , explains the working principle: when the crane hook is lifted to the hook head to lift the weight 5, the trigger arm 7 will automatically lift up, triggering the travel switch 2 to work, and then control the crane hook to stop lifting and reach the limit. Specifically, Figure 1 It is a structural schematic diagram of a crane hook when it is lifted to the hook head and the weight 5 is lifted up; Figure 2 It is a structural schematic diagram of a crane hook when the hook head has not yet been raised to the weight 5 and the weight 5 is in a naturally drooping state.

[0022] 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, characterized in that: It includes a mounting plate, on which a travel switch is provided, on which a trigger arm is rotatably connected, and a baffle is vertically connected to one side of the bottom of the mounting plate; the trigger arm is located above the baffle, and the other end of the trigger arm is connected to a suspension chain, and the suspension chain is connected to a weight, so that the trigger arm is overlapped on the edge of the baffle through the downward gravity of the weight; one end of the upper part of the mounting plate is connected to an anti-detachment hanging chain, and the other end of the anti-detachment hanging chain is fixed to the crane, and the other end of the upper part of the mounting plate is fixed to the dead rope of the wire rope of the crane hook, and the weight can be moved up and down and connected to the dead rope of the wire rope of the crane hook.

2. A crane weight limiting device according to claim 1, characterized in that: A connecting hole is arranged at one end of the upper part of the mounting plate, and one end of the anti-dropping hanging chain is connected to the connecting hole.

3. A crane weight limiting device according to claim 1, characterized in that: The other end of the upper part of the mounting plate is provided with a wire rope clamp for fixing on the dead rope of the wire rope of the crane hook, and the wire rope clamp is fixed on the mounting plate by bolts.

4. A crane weight limiting device according to claim 1, characterized in that: The other end of the trigger arm is provided with a through hole, and one end of the suspension chain is provided with a lock hook ring, and the suspension chain is connected to the through hole of the trigger arm through the lock hook ring.

5. A crane weight limiting device according to claim 1, characterized in that: The weight is provided with a first connecting ring and a second connecting ring. The first connecting ring is connected to the upper part of the weight through a fixing pin, and the second connecting ring is connected to the weight below the first connecting ring through bolts.

6. A crane weight limiting device according to claim 5, characterized in that: The first connecting ring and the second connecting ring are both U-shaped, the first connecting ring is connected to the other end of the suspension chain, and the second connecting ring is sleeved on the dead rope of the wire rope of the crane hook.

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