A crane limiter

Abstract

The utility model relates to the technical field of crane machinery, concretely is a kind of crane limiting device, including cylinder, telescopic link, transmission mechanism, shift fork connecting rod;The one end of cylinder is connected with crane, and the other end is provided with outer limiting ring;Telescopic link one end is provided with spherical bumper, and the other end is provided with buffer head;Telescopic link outer wall is provided with telescopic spring, and telescopic link reciprocates in the cylinder;Transmission mechanism is arranged on the outer wall of the cylinder, and transmission mechanism is provided with linkage rod, and the one end of linkage rod is provided with baffle, and the other end is provided with limiting rod;It is through the combined action of " telescopic spring+inner limiting device+stroke switch", realizes the detection and limiting of stress direction, effectively prevents equipment to tip over.

Description

Technical Field

[0001] This utility model relates to the field of crane machinery technology, specifically a crane limiting device. Background Technology

[0002] Traditional limit switches lack automatic adjustment functions and are prone to failure due to changes in external forces or equipment vibrations, posing a risk of tipping over. Traditional devices often use rigid limits or single mechanical structures, lacking buffering and automatic reset mechanisms, making installation and maintenance inconvenient. Under sudden stress, traditional limit switches cannot react quickly, easily causing equipment damage or safety accidents. Once displacement or tilting occurs, traditional devices often require manual intervention to restore their original position, affecting the continuous operation efficiency of the equipment. Traditional limit switches are difficult to adjust flexibly to different working conditions or load changes, limiting their applicability. Utility Model Content

[0003] In view of the deficiencies of the prior art, this utility model provides a crane limiting device, which realizes the detection and limiting of the direction of force through the combined action of "telescopic spring + internal limiting device + limit switch", effectively preventing the equipment from tipping over.

[0004] To achieve the above objectives, the present invention provides a crane limiting device, comprising a cylinder, a telescopic rod, a transmission mechanism, and a fork connecting rod; one end of the cylinder is connected to the crane, and the other end is provided with an outer limiting ring; one end of the telescopic rod is provided with a spherical buffer, and the other end is provided with a buffer head; a telescopic spring is provided on the outer wall of the telescopic rod, and the telescopic rod reciprocates within the cylinder; the transmission mechanism is located on the outer wall of the cylinder, and the transmission mechanism is provided with a connecting rod, one end of which is provided with a baffle, and the other end of which is provided with a limiting rod; the transmission mechanism is provided with a limit switch, and the limit switch contacts the connecting rod; one end of the fork connecting rod is connected to the outer wall of the cylinder, and the other end penetrates the cylinder and contacts the limiting rod.

[0005] Furthermore, the telescopic rod is provided with an inner limiting device, which is placed inside the cylinder and contacts one side of the outer limiting ring.

[0006] Furthermore, there are three telescopic springs: one contacts the spherical buffer, another contacts the other side of the outer limiting ring, and a third telescopic spring is provided between the two telescopic springs.

[0007] Furthermore, the transmission mechanism is provided with a housing, and the connecting rod passes through the housing.

[0008] Furthermore, the limit switch is equipped with a telescopic pulley.

[0009] Furthermore, the outer wall of the linkage is provided with a sliding sleeve, which extends from the outside of the housing to the front of the telescopic pulley inside the housing.

[0010] Furthermore, a linkage spring is provided on the outer wall of the linkage rod.

[0011] Furthermore, there are two linkage springs, one of which contacts the baffle, and the other of which contacts the outer wall of the housing.

[0012] Furthermore, the cylinder is filled with lubricating grease.

[0013] Furthermore, when the telescopic rod is compressed under force, the buffer head contacts the shift fork connecting rod, and the shift fork connecting rod moves the connecting rod in the direction of force through the limiting rod, causing the telescopic pulley to contact the sliding sleeve, the telescopic pulley retracts, and the limit switch is opened.

[0014] The beneficial effects of this utility model are as follows: Through the combined action of a spring device, an internal limit device, and a travel switch, the direction of force is detected and limited, effectively preventing equipment tipping. The spring device provides elastic buffering, reducing the impact of impact on the structure, and has an automatic reset function, improving the stability and continuity of equipment operation. The use of a fork linkage and connecting rod transmission mechanism results in a compact structure and high transmission efficiency, enabling rapid triggering of the travel switch when force changes, achieving immediate limit switching. The integrated design of the internal limit and transmission mechanism reduces exposed parts, lowers the failure rate, and facilitates maintenance and replacement. The spring preload or limit position can be adjusted according to actual needs to adapt to different loads and operating conditions, exhibiting good versatility and expandability. Attached Figure Description

[0015] Figure 1 This is a top view of the present invention; Figure 2 This is a cross-sectional view of the present invention; Figure 3 for Figure 1 A magnified view of part A; In the diagram: 100, cylinder body; 110, outer limiting ring. 200. Telescopic rod; 210. Spherical damper; 220. Buffer head; 230. Inner limit device; 240. Telescopic spring. 300. Transmission mechanism; 310. Linking rod; 311. Baffle; 312. Limiting rod; 313. Sliding sleeve; 314. Linking spring; 320. Limit switch; 321. Telescopic pulley; 330. Housing. 400. Shift fork linkage. Detailed Implementation

[0016] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0017] like Figure 1-3 As shown, one embodiment of this utility model discloses a crane limiting device, including a cylinder 100, a telescopic rod 200, a transmission mechanism 300, and a shift fork connecting rod 400. One end of the cylinder 100 is connected to the crane, and the other end is provided with an outer limiting ring 110. One end of the telescopic rod 200 is provided with a spherical buffer 210, and the other end is provided with a buffer head 220. A telescopic spring 240 is provided on the outer wall of the telescopic rod 200, and the telescopic rod 200 reciprocates within the cylinder 100. The transmission mechanism 300 is located on the outer wall of the cylinder 100, and the transmission mechanism 300 is provided with a connecting rod 310. One end of the connecting rod 310 is provided with a baffle 311, and the other end is provided with a limiting rod 312. The transmission mechanism 300 is provided with a limit switch 320, which is in contact with the connecting rod 310. One end of the shift fork connecting rod 400 is connected to the outer wall of the cylinder 100, and the other end passes through the cylinder 100 and is in contact with the limiting rod 312.

[0018] In one embodiment, the retractable rod is provided with an inner limiting device 230, which is placed inside the cylinder 100 and contacts one side of the outer limiting ring 110.

[0019] In one embodiment, there are three telescopic springs 240, one of which contacts the spherical buffer 210, another of which contacts the other side of the outer limiting ring 110, and a third telescopic spring 240 is provided between the two telescopic springs 240.

[0020] In one embodiment, the transmission mechanism 300 is provided with a housing 330, and the connecting rod 310 passes through the housing 330.

[0021] In one embodiment, the limit switch 320 is provided with a telescopic pulley 321.

[0022] In one embodiment, the outer wall of the linkage 310 is provided with a sliding sleeve 313, which extends from the outside of the housing 330 to the front of the telescopic pulley 321 inside the housing 330.

[0023] In one embodiment, a linkage spring 314 is provided on the outer wall of the linkage rod 310.

[0024] Furthermore, there are two linkage springs 314, one of which is in contact with the baffle 311, and the other is in contact with the outer wall of the housing 330.

[0025] In one embodiment, the cylinder 100 is filled with grease.

[0026] In one embodiment, the telescopic rod 200 retracts under force, the buffer head 220 contacts the shift fork link 400, the shift fork link 400 moves the connecting rod 310 in the direction of force through the limiting rod 312, causing the telescopic pulley 321 to contact the sliding sleeve 313, the telescopic pulley 321 retracts, and the limit switch 320 is opened.

[0027] It should be noted that the multi-stage spring buffer assembly consists of three telescopic springs 240 sleeved on the outer wall of the telescopic rod 200, forming the core buffer unit. The preferred arrangement is as follows: the first spring abuts against the inner side of the spherical buffer 210, the second spring abuts against the outer side of the outer limiting ring 110, and the third spring is placed between the first two. This arrangement enables segmented absorption of impact energy, providing a smooth damping effect and effectively avoiding rigid impacts. The shift fork connecting rod 400 has one end hinged to the outer wall of the cylinder 100, its middle section penetrates the cylinder 100 wall, and its other end maintains a certain gap with or can contact the buffer head 220 of the telescopic rod 200. When the telescopic rod 200 is compressed and retracts, the buffer head 220 pushes the shift fork connecting rod 400. The transmission mechanism 300 is encapsulated within the housing 330 and attached to the outer wall of the cylinder 100. Its core is the connecting rod 310, which has a baffle 311 at one end and a limiting rod 312 at the other end. The outer end of the fork linkage 400 pushes the limit rod 312, converting the linear motion of the telescopic rod 200 into the lateral motion of the linkage rod 310; Linkage reset mechanism: Two linkage springs 314 are sleeved on the outer wall of the linkage rod 310. One spring is located between the baffle 311 and the inner wall of the housing 330, and the other is located between the outer wall of the housing 330 and a retaining ring. This double-spring design ensures that the linkage rod 310 can quickly and stably reset after being subjected to force; Limit switch 320: Installed on the housing 330 of the transmission mechanism 300, it is a key component for issuing control signals; Trigger and reset assembly: A sliding sleeve 313 is fixed on the linkage rod 310, which extends from the outside of the housing 330 to the front of the telescopic pulley 321 of the limit switch 320 inside. When the linkage rod 310 moves, the sliding sleeve 313 presses the telescopic pulley 321, causing it to contract, thereby triggering the limit switch 320. When the force disappears, the linkage spring 314 pushes the linkage rod 310 to reset, the sliding sleeve 313 disengages, the telescopic pulley 321 extends under the action of its own spring, and the limit switch 320 resets.

[0028] The working process of the crane limiting device described above is as follows: Standby state: When the crane is running normally, the telescopic boom 200 is in the extended state under the spring preload, and there is no contact between the components. The limit switch 320 is in the normally closed or normally open state (according to the safety logic setting).

[0029] Triggering Phase: When the crane reaches the limit position and contacts an obstacle, the obstacle presses against the spherical buffer 210, causing the telescopic rod 200 to retract into the cylinder 100. The telescopic rod 200 overcomes the resistance of multiple telescopic springs 240, absorbing most of the impact energy. The buffer head 220 moves accordingly, pushing the shift fork linkage 400 to rotate around its fulcrum. The other end of the shift fork linkage 400 pushes the limit rod 312 in the transmission mechanism 300, causing the entire linkage 310 to slide laterally. The sliding sleeve 313 on the linkage 310 moves accordingly, pressing against the telescopic pulley 321 of the limit switch 320. Signal Output and Safety Response: When the telescopic pulley 321 is pressed down, the limit switch 320 is instantaneously triggered, emitting an electrical signal. This signal can be immediately transmitted to the crane's control system, cutting off the power output in the corresponding direction or activating an audible and visual alarm to achieve automatic shutdown.

[0030] Reset Phase: When the obstacle is removed, the telescopic rod 200 is pushed outward by the restoring force of multiple telescopic springs 240, resetting to its initial position. Simultaneously, the fork linkage 400 stops pressing on the limit rod 312, the linkage rod 310 is precisely reset by the action of the linkage springs 314 on both sides, the sliding sleeve 313 disengages from the telescopic pulley 321, the limit switch 320 returns to its original state, the crane releases its limit lock, and can run in reverse.

[0031] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0032] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0033] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0034] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature. It should be noted that when an element is referred to as "fixed to" or "set on" another element, it can be directly on the other element or there may be an intermediate element present. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element present. The terms "vertical," "horizontal," "above," "below," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible embodiments.

Claims

1. A crane limiter device, characterized by: include The cylinder is connected to the crane at one end and has an outer limit ring at the other end; The telescopic rod has a spherical buffer at one end and a buffer head at the other end; a telescopic spring is provided on the outer wall of the telescopic rod, and the telescopic rod reciprocates inside the cylinder. A transmission mechanism is provided on the outer wall of the cylinder. The transmission mechanism is provided with a connecting rod, one end of which is provided with a baffle and the other end with a limit rod. The transmission mechanism is also provided with a limit switch, which is in contact with the connecting rod. The fork connecting rod has one end connected to the outer wall of the cylinder, and the other end passing through the cylinder and contacting the limiting rod.

2. A crane limiter according to claim 1, characterised in that: The telescopic rod is equipped with an inner limiting device, which is placed inside the cylinder and contacts one side of the outer limiting ring.

3. A crane limiter according to claim 1, characterised in that: There are three telescopic springs: one is in contact with the spherical buffer, another is in contact with the other side of the outer limiting ring, and a third telescopic spring is provided between the two telescopic springs.

4. A crane limiter according to claim 1, characterised in that: The transmission mechanism is provided with a housing, and the connecting rod passes through the housing.

5. A crane limiter according to claim 4, characterised in that: The limit switch is equipped with a telescopic pulley.

6. A crane limiter according to claim 5, characterised in that: The outer wall of the linkage is provided with a sliding sleeve, which extends from the outside of the housing to the front of the telescopic pulley inside the housing.

7. A crane limiter according to claim 4, characterised in that: A linkage spring is provided on the outer wall of the linkage rod.

8. A crane limiter according to claim 7, characterised in that: There are two linkage springs, one of which is in contact with the baffle, and the other is in contact with the outer wall of the housing.

9. A crane limiter as claimed in claim 1, characterized in that: The cylinder is filled with lubricating grease.

10. A crane limiter as claimed in claim 1, characterized in that: When the telescopic rod is compressed, the buffer head contacts the fork linkage. The fork linkage moves the connecting rod in the direction of force through the limiting rod, causing the telescopic pulley to contact the sliding sleeve. The telescopic pulley retracts, opening the limit switch.

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