An overspeed protection device and system for cranes
By designing an overspeed protection device that combines a rotating arm and a speed reducer, the problem of goods falling due to excessive crane drum speed was solved, and the drum speed was automatically adjusted, thus improving the safety of the crane.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- DALIAN MEIHENG ELECTRIC CO LTD
- Filing Date
- 2026-04-21
- Publication Date
- 2026-05-26
AI Technical Summary
Existing cranes are prone to excessively rapid drum rotation due to the weight of the cargo during lifting, causing the cargo to descend quickly and fall, thus reducing safety during use.
An overspeed protection device is designed, comprising a deceleration housing, a rotating disk, first and second deceleration components, and first and second telescopic components. Through the cooperation of the rotating arm and the deceleration plate, the device utilizes centrifugal force and the telescopic movement of the telescopic components to automatically decelerate the drum and prevent the goods from falling rapidly.
This effectively prevents goods from falling rapidly, improving the safety of crane operation. By automatically adjusting the drum speed, it prevents goods from falling.
Smart Images
Figure CN224279581U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the technical field of crane protection devices, and in particular to an overspeed protection device and system for cranes. Background Technology
[0002] Cranes are mechanical devices used to lift, lower, and move heavy objects. They are widely used in industries such as construction, manufacturing, transportation, and ports to handle and move large items or materials. Cranes mainly include hoisting mechanisms, traveling mechanisms, luffing mechanisms, slewing mechanisms, and metal structures.
[0003] Existing cranes are prone to internal drum rotation due to the weight of the cargo during lifting. When the drum rotates, the cargo falls rapidly, which can lead to the cargo falling and reduce the safety of the crane. Therefore, an overspeed emergency stop protection device for crane descent is proposed. Utility Model Content
[0004] In response to the aforementioned technical problems, an overspeed protection device and system for cranes are provided.
[0005] The technical means adopted in this utility model are as follows:
[0006] In a first aspect, an overspeed protection device for a crane includes a reduction housing, a rotating disk, a first reduction assembly, a second reduction assembly, a first telescopic assembly, and a second telescopic assembly. The reduction housing is annular and fixedly mounted on the boom of the crane, with its axis aligned with the axis of the crane's drum. The rotating disk is disc-shaped, coaxial, and fixedly mounted on the crane's drum. The first reduction assembly includes a first rotating arm and a first reduction plate. The first rotating arm has a first hinge portion and a second hinge portion sequentially arranged along its length. One end of the first rotating arm near the first hinge portion is rotatably mounted on the rotating disk, and the first reduction plate is fixedly mounted on the first rotating arm near the second hinge portion. The first rotating arm and the second rotating arm are respectively hinged to the first and the fourth rotating arm. The second rotating arm is provided with a third hinge and a fourth hinge in sequence along its length. The end of the second rotating arm near the third hinge is rotatably mounted on the rotating disk. The second speed reduction plate is fixedly mounted on the end of the second rotating arm near the fourth hinge. The first rotating arm and the second rotating arm are symmetrical about the center of the rotating disk. The first hinge and the third hinge are symmetrical about the center of the rotating disk. The second hinge and the fourth hinge are symmetrical about the center of the rotating disk. The two ends of the first telescopic component are respectively hinged to the first hinge and the fourth hinge. The two ends of the second telescopic component are respectively hinged to the second hinge and the third hinge.
[0007] Furthermore, the first telescopic assembly includes a first housing, a first telescopic arm, a second telescopic arm, and a first telescopic spring; a first sliding cavity is coaxially formed inside the first housing; one end of the first telescopic arm and one end of the second telescopic arm are slidably mounted in the first sliding cavity, and the other ends of the first telescopic arm and the other ends of the second telescopic arm extend out of the first housing through the two ends of the first sliding cavity and are respectively hinged to the first hinge portion and the fourth hinge portion; the first telescopic spring is located inside the first sliding cavity and between the first telescopic arm and the second telescopic arm, and the two ends of the first telescopic spring are respectively fixedly mounted on the first telescopic arm and the second telescopic arm.
[0008] Furthermore, the first telescopic component employs a telescopic hydraulic cylinder.
[0009] Furthermore, the second telescopic assembly includes a second housing, a third telescopic arm, a fourth telescopic arm, and a second telescopic spring; a second sliding cavity is coaxially formed inside the second housing; one end of the third telescopic arm and one end of the fourth telescopic arm are slidably mounted in the second sliding cavity, and the other ends of the third telescopic arm and the fourth telescopic arm extend out of the second housing through the two ends of the second sliding cavity and are respectively hinged to the second hinge portion and the third hinge portion; the second telescopic spring is located inside the second sliding cavity and between the third telescopic arm and the fourth telescopic arm, and the two ends of the second telescopic spring are respectively fixedly mounted on the third telescopic arm and the fourth telescopic arm.
[0010] Furthermore, the second telescopic component employs a telescopic hydraulic cylinder.
[0011] Furthermore, the deceleration housing includes an annular housing and an annular deceleration plate; both the annular housing and the annular deceleration plate are annular in shape, and the axis of the annular housing and the axis of the annular deceleration plate are on the same straight line as the axis of the deceleration housing. The inner side of the annular housing is fixedly connected to the outer side of the annular deceleration plate.
[0012] In a second aspect, an overspeed protection system for a crane includes a crane; the crane includes a boom and a drum, the drum being rotatably mounted on one end of the boom; it also includes an overspeed protection device for a crane as described in any one of the first aspects; the deceleration housing of the overspeed protection device is fixedly mounted on the boom of the crane, and the axis of the deceleration housing of the overspeed protection device is on the same straight line as the axis of the drum of the crane; the rotating disk of the overspeed protection device is coaxial and fixedly mounted on the drum of the crane.
[0013] This utility model has the following advantages:
[0014] 1. In this utility model, the deceleration housing is fixedly installed on the boom of the crane. The rotating disc, the first deceleration assembly, the second deceleration assembly, the first telescopic assembly, and the second telescopic assembly all rotate around the axis of the crane drum. When it is not necessary to decelerate the crane drum, the first and second telescopic assemblies are retracted, and the first and second rotating arms respectively drive the first and second deceleration plates away from the annular deceleration plate until neither of them contacts the annular deceleration plate. In this case, the overspeed protection device for the crane in this utility model will not decelerate the crane drum. When it is necessary to decelerate the crane drum, the first and second telescopic assemblies are extended, and the first and second rotating arms respectively drive the first and second deceleration plates closer to the annular deceleration plate until both of them contact the annular deceleration plate. In this case, the overspeed protection device for the crane in this utility model will then decelerate the crane drum. This utility model can prevent goods from falling rapidly, thereby preventing goods from falling and improving the safety of crane operation.
[0015] 2. In this utility model, when the first telescopic component adopts a structure including a first outer shell, a first telescopic arm, a second telescopic arm, and a first telescopic spring, and the second telescopic component adopts a structure including a second outer shell, a third telescopic arm, a fourth telescopic arm, and a second telescopic spring; if the rotational speed of the crane drum increases, the first and second telescopic springs will lengthen under the influence of increased centrifugal force, and the first and second rotating arms will respectively drive the first and second decelerator plates closer to the annular decelerator plate until both the first and second decelerator plates are in contact with the annular decelerator plate, thereby decelerating the crane drum; if the rotational speed of the crane drum decreases, the first and second telescopic springs will shorten under the influence of decreased centrifugal force, and the first and second rotating arms will respectively drive the first and second decelerator plates away from the annular decelerator plate until neither the first nor the second decelerator plates are in contact with the annular decelerator plate, thereby not decelerating the crane drum.
[0016] 3. In this utility model, when both the first telescopic component and the second telescopic component adopt telescopic hydraulic cylinders, the drum speed of the crane can be controlled by controlling the telescopic hydraulic cylinders to extend and retract. Attached Figure Description
[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0018] Figure 1This is an overall structural diagram of an overspeed protection device for a crane according to the present invention, when both the first and second speed reducers are in contact with the annular speed reducer.
[0019] Figure 2 This is an overall structural diagram of an overspeed protection device for a crane according to the present invention, when neither the first nor the second decelerator is in contact with the annular decelerator.
[0020] Figure 3 This is an overall structural diagram of the first deceleration component in this utility model;
[0021] Figure 4 This is an overall structural diagram of the second deceleration component in this utility model;
[0022] Figure 5 This is an overall structural diagram of the first telescopic component in this utility model;
[0023] Figure 6 This is an overall structural diagram of the second telescopic component in this utility model;
[0024] Figure 7 This is an overall structural diagram of the deceleration housing in this utility model;
[0025] Reference numerals: 1-Reduction housing; 2-Rotating disk; 3-First reduction assembly; 4-Second reduction assembly; 5-First telescopic assembly; 6-Second telescopic assembly; 101-Annular housing; 102-Annular reduction plate; 301-First rotating arm; 302-First reduction plate; 303-First reinforcing rib; 401-Second rotating arm; 402-Second reduction plate; 403-Second reinforcing rib; 501-First housing; 502-First telescopic arm; 503-Second telescopic arm; 504-First telescopic spring; 601-Second housing; 602-Third telescopic arm; 603-Fourth telescopic arm; 604-Second telescopic spring. Detailed Implementation
[0026] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.
[0027] Example 1:
[0028] like Figures 1 to 7As shown, an overspeed protection device for a crane includes a reduction housing 1, a rotating disk 2, a first reduction assembly 3, a second reduction assembly 4, a first telescopic assembly 5, and a second telescopic assembly 6. The reduction housing 1 is annular and is fixedly mounted on the boom of the crane. The axis of the reduction housing 1 is on the same straight line as the axis of the crane's drum. The rotating disk 2 is disc-shaped and coaxially mounted on the crane's drum. The first reduction assembly 3 includes a first rotating arm 301 and a first reduction plate 302. The first rotating arm 301 has a first hinge portion and a second hinge portion sequentially arranged along its length. The end of the first rotating arm 301 near the first hinge portion is rotatably mounted on the rotating disk 2. The first reduction plate 302 is fixedly mounted on the first rotating arm 301 near the second hinge portion. On one end; the second deceleration assembly 4 includes a second rotating arm 401 and a second deceleration plate 402. The second rotating arm 401 is provided with a third hinge portion and a fourth hinge portion in sequence along its length direction. The end of the second rotating arm 401 near the third hinge portion is rotatably mounted on the rotating disk 2. The second deceleration plate 402 is fixedly mounted on the end of the second rotating arm 401 near the fourth hinge portion. The first rotating arm 301 and the second rotating arm 401 are symmetrical about the center of the rotating disk 2. The first hinge portion and the third hinge portion are symmetrical about the center of the rotating disk 2. The second hinge portion and the fourth hinge portion are symmetrical about the center of the rotating disk 2. The two ends of the first telescopic assembly 5 are respectively hinged to the first hinge portion and the fourth hinge portion. The two ends of the second telescopic assembly 6 are respectively hinged to the second hinge portion and the third hinge portion.
[0029] Specifically, the first rotating arm 301 and the second rotating arm 401 are respectively provided with a first reinforcing rib 303 and a second reinforcing rib 403 to improve the strength of the first rotating arm 301 and the second rotating arm 401.
[0030] In this embodiment, the first telescopic component 5 includes a first housing 501, a first telescopic arm 502, a second telescopic arm 503, and a first telescopic spring 504; a first sliding cavity is coaxially formed inside the first housing 501; one end of the first telescopic arm 502 and one end of the second telescopic arm 503 are slidably mounted in the first sliding cavity, and the other end of the first telescopic arm 502 and the other end of the second telescopic arm 503 extend out of the first housing 501 through the two ends of the first sliding cavity and are respectively hinged to the first hinge portion and the fourth hinge portion; the first telescopic spring 504 is located in the first sliding cavity and between the first telescopic arm 502 and the second telescopic arm 503, and the two ends of the first telescopic spring 504 are respectively fixedly mounted on the first telescopic arm 502 and the second telescopic arm 503.
[0031] In this embodiment, the second telescopic component 6 includes a second housing 601, a third telescopic arm 602, a fourth telescopic arm 603, and a second telescopic spring 604. A second sliding cavity is coaxially formed inside the second housing 601. One end of the third telescopic arm 602 and one end of the fourth telescopic arm 603 are slidably mounted in the second sliding cavity. The other ends of the third telescopic arm 602 and the fourth telescopic arm 603 extend out of the second housing 601 through the two ends of the second sliding cavity and are respectively hinged to the second hinge portion and the third hinge portion. The second telescopic spring 604 is located inside the second sliding cavity and between the third telescopic arm 602 and the fourth telescopic arm 603. The two ends of the second telescopic spring 604 are respectively fixedly mounted on the third telescopic arm 602 and the fourth telescopic arm 603.
[0032] In this embodiment, the deceleration housing 1 includes an annular housing 101 and an annular deceleration plate 102; both the annular housing 101 and the annular deceleration plate 102 are annular in shape, and the axis of the annular housing 101 and the axis of the annular deceleration plate 102 are on the same straight line as the axis of the deceleration housing 1. The inner side of the annular housing 101 is fixedly connected to the outer side of the annular deceleration plate 102.
[0033] Example 2:
[0034] like Figures 1 to 4 , Figure 7 As shown, an overspeed protection device for a crane is provided, wherein the first telescopic component 5 and the second telescopic component 6 both adopt telescopic cylinders, and the speed of the crane drum is controlled by controlling the extension and retraction of the telescopic cylinders.
[0035] In this embodiment, the rest are the same as in Embodiment 1, and will not be described again here.
[0036] Example 3:
[0037] like Figures 1 to 7 As shown, an overspeed protection system for a crane includes a crane; the crane includes a boom and a drum, the drum being rotatably mounted on one end of the boom; it also includes any one of the overspeed protection devices for cranes in Embodiment 1 or Embodiment 2; the deceleration housing 1 of the overspeed protection device is fixedly mounted on the boom of the crane, and the axis of the deceleration housing 1 of the overspeed protection device is on the same straight line as the axis of the drum of the crane; the rotating disk 2 of the overspeed protection device is coaxial and fixedly mounted on the drum of the crane.
[0038] The working principle of this embodiment:
[0039] When it is not necessary to decelerate the crane drum, the first telescopic assembly 5 and the second telescopic assembly 6 are retracted. The first rotating arm 301 and the second rotating arm 401 respectively drive the first decelerator 302 and the second decelerator 402 away from the annular decelerator 102 until neither the first decelerator 302 nor the second decelerator 402 is in contact with the annular decelerator 102. In this embodiment, the overspeed protection device for the crane will not decelerate the crane drum. When it is necessary to decelerate the crane drum, the first telescopic assembly 5 and the second telescopic assembly 6 are extended. The first rotating arm 301 and the second rotating arm 401 respectively drive the first decelerator 302 and the second decelerator 402 closer to the annular decelerator 102 until both the first decelerator 302 and the second decelerator 402 are in contact with the annular decelerator 102. In this embodiment, the overspeed protection device for the crane will decelerate the crane drum.
[0040] In this embodiment, an overspeed protection device for a crane provided in Embodiment 1 can be used. If the speed of the crane drum increases, the first telescopic spring 504 and the second telescopic spring 604 will be stretched under the influence of increased centrifugal force. The first rotating arm 301 and the second rotating arm 401 will then drive the first deceleration plate 302 and the second deceleration plate 402 to approach the annular deceleration plate 102, until both the first deceleration plate 302 and the second deceleration plate 402 are in contact with the annular deceleration plate 102, thereby decelerating the crane drum. If the speed of the crane drum decreases, the first telescopic spring 504 and the second telescopic spring 604 will be shortened under the influence of weakened centrifugal force. The first rotating arm 301 and the second rotating arm 401 will then drive the first deceleration plate 302 and the second deceleration plate 402 away from the annular deceleration plate 102, until neither the first deceleration plate 302 nor the second deceleration plate 402 are in contact with the annular deceleration plate 102, thereby preventing the crane drum from being decelerated.
[0041] This embodiment can also use an overspeed protection device for cranes provided in Embodiment 2, which controls the speed of the crane drum by controlling the extension and retraction of the telescopic cylinder.
[0042] This embodiment can prevent the cargo from falling rapidly, thereby improving the safety of crane operation.
[0043] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.
Claims
1. An overspeed protection device for a crane, characterized in that It includes a deceleration housing (1), a rotating disk (2), a first deceleration assembly (3), a second deceleration assembly (4), a first telescopic assembly (5), and a second telescopic assembly (6); The deceleration housing (1) is annular in shape. The deceleration housing (1) is fixedly installed on the boom of the crane. The axis of the deceleration housing (1) is on the same straight line as the axis of the crane drum. The rotating disk (2) is disc-shaped and is coaxially and fixedly installed on the drum of the crane; The first deceleration assembly (3) includes a first rotating arm (301) and a first deceleration plate (302). The first rotating arm (301) is provided with a first hinge portion and a second hinge portion in sequence along its length direction. The end of the first rotating arm (301) near the first hinge portion is rotatably mounted on the rotating disk (2). The first deceleration plate (302) is fixedly mounted on the end of the first rotating arm (301) near the second hinge portion. The second deceleration assembly (4) includes a second rotating arm (401) and a second deceleration plate (402). The second rotating arm (401) is provided with a third hinge and a fourth hinge in sequence along its length direction. The end of the second rotating arm (401) near the third hinge is rotatably mounted on the rotating disk (2). The second deceleration plate (402) is fixedly mounted on the end of the second rotating arm (401) near the fourth hinge. The first rotating arm (301) and the second rotating arm (401) are symmetrical about the center of the rotating disk (2), the first hinge part and the third hinge part are symmetrical about the center of the rotating disk (2), and the second hinge part and the fourth hinge part are symmetrical about the center of the rotating disk (2). The two ends of the first telescopic component (5) are respectively hinged to the first hinge part and the fourth hinge part; The two ends of the second telescopic component (6) are respectively hinged to the second hinge portion and the third hinge portion.
2. A kind of overspeed protection device for crane according to claim 1, with the characteristics that, The first telescopic assembly (5) includes a first housing (501), a first telescopic arm (502), a second telescopic arm (503), and a first telescopic spring (504). The first outer shell (501) has a first sliding cavity coaxially formed inside; One end of the first telescopic arm (502) and one end of the second telescopic arm (503) are slidably installed in the first sliding cavity. The other end of the first telescopic arm (502) and the other end of the second telescopic arm (503) extend through the two ends of the first sliding cavity to the outside of the first outer shell (501) and are respectively hinged to the first hinge part and the fourth hinge part. The first telescopic spring (504) is located in the first sliding cavity and between the first telescopic arm (502) and the second telescopic arm (503). The two ends of the first telescopic spring (504) are respectively fixedly installed on the first telescopic arm (502) and the second telescopic arm (503).
3. The overspeed protection device for a crane according to claim 1, characterized by The first telescopic component (5) adopts a telescopic hydraulic cylinder.
4. The overspeed protection device for a crane according to claim 1, characterized by The second telescopic assembly (6) includes a second housing (601), a third telescopic arm (602), a fourth telescopic arm (603), and a second telescopic spring (604). The second outer casing (601) has a second sliding cavity coaxially formed inside; One end of the third telescopic arm (602) and one end of the fourth telescopic arm (603) are slidably installed in the second sliding cavity. The other end of the third telescopic arm (602) and the other end of the fourth telescopic arm (603) extend through the two ends of the second sliding cavity to the outside of the second outer shell (601) and are respectively hinged to the second hinge part and the third hinge part. The second telescopic spring (604) is located in the second sliding cavity and between the third telescopic arm (602) and the fourth telescopic arm (603). The two ends of the second telescopic spring (604) are respectively fixedly installed on the third telescopic arm (602) and the fourth telescopic arm (603).
5. The overspeed protection device for a crane according to claim 1, characterized in that, The second telescopic component (6) uses a telescopic hydraulic cylinder.
6. The overspeed protection device for a crane according to claim 1, characterized in that, The deceleration housing (1) includes an annular housing (101) and an annular deceleration plate (102). The annular outer shell (101) and the annular speed reducer (102) are both annular. The axis of the annular outer shell (101) and the axis of the annular speed reducer (102) are both on the same straight line as the axis of the speed reducer (1). The inner side of the annular outer shell (101) and the outer side of the annular speed reducer (102) are fixedly connected together.
7. An overspeed protection system for a crane, comprising a crane; the crane comprising a boom and a drum, the drum being rotatably mounted on one end of the boom; Its features are, It also includes the overspeed protection device for cranes as described in any one of claims 1 to 6; The deceleration housing (1) of the overspeed protection device for the crane is fixedly installed on the boom of the crane, and the axis of the deceleration housing (1) of the overspeed protection device for the crane is on the same straight line as the axis of the drum of the crane. The rotating disk (2) in the overspeed protection device for the crane is coaxial and fixedly installed on the drum of the crane.