Gantry crane grab bucket

Abstract

The utility model discloses a grab bucket of a gantry crane, and aims to overcome the defect that a crane is lack of a grab bucket opening degree detection device in the prior art. The technical problem is solved through the following technical scheme: a telescopic device is arranged on a push rod rear support; the grab bucket assembly comprises a first grab bucket and a second grab bucket which are matched with each other. The first grab bucket and the second grab bucket are hinged to the push rod rear support through grab bucket connecting rods. The opening degree detection device comprises an encoder, an encoder leading-out shaft is arranged on the encoder, and the encoder leading-out shaft penetrates through the rotating center of the grab bucket connecting rod and is fixedly connected with the grab bucket connecting rod; the telescopic device drives the first grab bucket and the second grab bucket to be opened or closed synchronously through the connecting rod mechanism. According to the utility model, the first grab bucket and the second grab bucket are matched with the encoder, so that the opening degrees of the first grab bucket and the second grab bucket are detected in real time, and the rotating bucket can be moved to a target position when the grab buckets are completely closed without material leakage.

Description

Technical Field

[0001] This utility model relates to the field of crane technology, and more specifically, to a gantry crane grab bucket. Background Technology

[0002] Gantry cranes are slewing jib cranes that run along ground rails and allow railway or other ground vehicles to pass underneath. They are widely used in the mechanical loading and unloading of goods in ports and docks, the construction and installation of ships in shipyards, and dam construction projects at large hydroelectric power stations. They are indispensable equipment for achieving mechanization in production processes. Gantry cranes mainly consist of a hoisting mechanism, a luffing mechanism, a slewing mechanism, and a traveling mechanism. They can be classified into the following categories according to their applications:

[0003] (1) Port general-purpose gantry crane, equipped with replaceable hooks, grabs and other lifting tools, can meet the requirements of port loading and unloading of different types of piece goods, bulk materials and containers;

[0004] (2) A gantry crane with a grab bucket, wherein the gantry is equipped with a hopper and a belt conveyor, and the gantry crane is used to unload ships with grab buckets;

[0005] (3) Container gantry crane is a special gantry crane used in container terminals and yards;

[0006] (4) Shipyard gantry crane: A gantry crane mounted on a high gantry, used for hoisting work in shipyards, with a large lifting capacity and a large lifting height. It is usually equipped with two or more lifting hooks. Its working speed is lower than that of gantry cranes used in ports. To meet the requirements of work turning operations, the main and auxiliary hooks can work together;

[0007] (5) Power station gantry crane: A gantry crane used for power station construction, which has a large working radius and lifting capacity, and is easy to disassemble and assemble, and is convenient to move to the construction site.

[0008] In existing technologies, crane grab buckets lack opening degree detection. When operated manually on-site, the opening degree of the grab bucket can only be judged by visual observation. During remote automated operation, closed-loop control of the grab bucket cannot be achieved, reducing the safety and reliability of automated crane operation. Grab bucket opening degree detection is crucial for the material grabbing process. The bucket can only be moved to the target position when it is fully closed and there is no material leakage. Inaccurate detection can lead to material spillage during movement, causing unnecessary losses and environmental pollution. Utility Model Content

[0009] This invention overcomes the shortcomings of existing cranes that lack a grab bucket opening detection device, and provides a gantry crane grab bucket that can automatically detect the grab bucket opening. This enables automatic detection and display of the grab bucket's opening and closing degree during manual on-site operation, and achieves closed-loop control of grab bucket operation during remote automatic operation, providing a technical foundation for remote fully automatic control of cranes.

[0010] To solve the above-mentioned technical problems, this utility model adopts the following technical solution: a gantry crane grab bucket, comprising:

[0011] The push rod rear support is equipped with a telescopic device.

[0012] The grab assembly includes a first grab and a second grab that cooperate with each other. Both the first grab and the second grab are hinged to the push rod rear support via grab connecting rods.

[0013] The opening detection device includes an encoder, which has an encoder lead-out shaft that passes through the rotation center of the grab bucket link and is fixedly connected to the grab bucket link.

[0014] The telescopic device drives the first and second grabs to open or close synchronously via a linkage mechanism.

[0015] In this invention, the first grab bucket, the second grab bucket, and the encoder work together to achieve real-time detection of the opening degree of the first grab bucket and the second grab bucket. This enables automatic detection and display of the opening and closing degree of the grab bucket during manual on-site operation, and achieves closed-loop control of the grab bucket operation during remote automatic operation.

[0016] Preferably, an encoder mounting bracket is provided on the rear support of the push rod, and the encoder is fixedly mounted on the rear support of the push rod through the encoder mounting bracket.

[0017] The encoder mounting bracket facilitates encoder installation.

[0018] Preferably, the linkage mechanism includes a push rod front support connected to the output end of the telescopic device, and a first drive rod and a second drive rod are hinged on the push rod front support.

[0019] The first drive rod is hinged to the grab bucket connecting rod on the first grab bucket;

[0020] The second drive rod is hinged to the grab linkage on the second grab.

[0021] When the output end of the telescopic device extends outward, causing the front support of the push rod to move outward, the first and second grab buckets open through the action of the first and second drive rods. Conversely, when the output end of the telescopic device retracts inward, causing the front support of the push rod to move inward, the first and second grab buckets close through the action of the first and second drive rods. Therefore, the opening and closing of the first and second grab buckets can be achieved through the telescopic action of the telescopic device.

[0022] Preferably, both the first and second grabs are connected to two grab linkages, and both grab linkages are hinged to the push rod rear support.

[0023] Two grab linkages are connected to the two ends of the first grab and the second grab respectively, making the first grab and the second grab more securely connected.

[0024] Preferably, there are two first drive rods, which are hinged to both ends of the push rod front support and respectively hinged to the two grab bucket connecting rods on the first grab bucket.

[0025] There are two second drive rods, which are hinged to both ends of the push rod front support. The two second drive rods are respectively hinged to the two grabs on the second grab bucket.

[0026] The two second drive rods and the first drive rod cooperate with the grab bucket connecting rod, which can improve the stability of the entire structure.

[0027] Preferably, the push rod rear support has several lifting rings, and these lifting rings are connected to lifting ring holes.

[0028] The lifting rings facilitate the secure connection between the lifting rope and the rear support of the push rod.

[0029] Preferably, the telescopic device is an electric push rod, the output end of which is an electric push shaft. The electric push shaft includes a first push shaft and a second push shaft. The end of the second push shaft is provided with a push shaft hole, and the first push shaft is slidably disposed in the second push shaft hole. Several pin holes are provided in the circumferential direction of the side wall of the push shaft hole, and telescopic pins that cooperate with the several pin holes are provided on the outer side wall of the first push shaft.

[0030] The electric actuator is highly stable, can be controlled by a PLC control circuit, and has precise extension and retraction stroke. When the encoder opening detection malfunctions, the electric actuator may extend too far or shorten too much, which can easily cause the first and second grippers to clamp too tightly or open at too large an angle, resulting in damage to related parts. In this embodiment, when the above situation occurs, due to excessive tension or thrust of the first actuator, the telescopic pin overcomes the spring force of the thrust spring, retracts, and disengages from the pin hole. The first actuator can then move within the pin hole and slide relative to the second actuator, thereby preventing damage to related parts due to excessive tightness or opening angle of the first and second grippers.

[0031] Preferably, a number of mounting holes are provided on the outer side wall of the first push shaft, the telescopic pin is slidably disposed in the mounting holes, and a thrust spring is provided between the telescopic pin and the bottom of the mounting hole, the thrust spring pushing the telescopic pin to move toward the opening of the mounting hole.

[0032] The thrust spring pushes the telescopic pin against the pin hole, so that the first push shaft and the second push shaft maintain a stable connection under normal use.

[0033] Preferably, two sets of encoders are provided, with the two sets of encoders arranged diagonally on the push rod shaft support.

[0034] Two sets of encoders detect the opening degree of the first grab bucket, the second grab bucket, and the combined opening degree of the two, respectively, and ensure that the center position of the grab bucket does not shift, thereby improving the stability of the overall structure.

[0035] Compared with the prior art, the beneficial effects of this utility model are as follows: In this utility model, the opening degree of the first grab bucket and the second grab bucket are detected in real time by cooperating with the encoder, so that the opening and closing degree of the grab bucket can be automatically detected and displayed when manually operated on the spot, and closed-loop control of grab bucket operation can be realized when remote automatic operation is carried out, thus providing a technical basis for remote fully automatic control of cranes. Attached Figure Description

[0036] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0037] Figure 2 This is a partial exploded structural diagram of this utility model.

[0038] Figure 3 This is a cross-sectional view of the present invention.

[0039] Figure 4 This is a cross-sectional view of the present invention located at the encoder axis position.

[0040] Figure 5This is a cross-sectional view of the electric push shaft of this utility model.

[0041] In the diagram: 1. Push rod rear support, 11. Connecting ear plate, 111. Connecting ear hole, 112. First rotating shaft, 12. Encoder mounting bracket, 13. Lifting ring;

[0042] 2. Telescopic device, 21. First through hole, 22. Electric push shaft, 23. First push shaft, 231. Telescopic pin, 232. Mounting hole, 233. Thrust spring, 24. Second push shaft, 241. Push shaft hole, 242. Pin hole;

[0043] 3. Grab bucket assembly, 31. First grab bucket, 32. Second grab bucket, 33. Grab bucket connecting rod, 331. First connecting rod hole;

[0044] 4. Encoder; 41. Encoder lead-out shaft; 42. Coupling;

[0045] 5. Linkage mechanism, 51. Push rod front support, 511. Support ear plate, 512. Support ear hole, 52. First drive rod, 53. Second drive rod. Detailed Implementation

[0046] The technical solution of this utility model will be further described in detail below through specific embodiments and with reference to the accompanying drawings:

[0047] Example 1: Refer to Figures 1 to 4 As shown, a gantry crane grab bucket includes:

[0048] Push rod rear support 1, and a telescopic device 2 is provided on push rod rear support 1;

[0049] The grab bucket assembly 3 includes a first grab bucket 31 and a second grab bucket 32 ​​that cooperate with each other. Both the first grab bucket 31 and the second grab bucket 32 ​​are hinged to the push rod rear support 1 via the grab bucket connecting rod 33. A connecting lug hole 111 is provided on the push rod rear support 1. A connecting lug hole 111 is provided through the connecting lug hole 111. A first connecting rod hole 331 is provided at the end of the grab bucket connecting rod 33. A first rotating shaft 112 passes through the first connecting rod hole 331 and the connecting lug hole, so that the connecting lug hole 11111 is hinged to the grab bucket connecting rod 33.

[0050] The opening detection device includes an encoder 4, which has an encoder lead-out shaft 41. The encoder lead-out shaft 41 passes through the rotation center of the grab bucket connecting rod 33 and is fixedly connected to the grab bucket connecting rod 33. In this embodiment, the first grab bucket 31 and the second grab bucket 32 ​​are each connected to an encoder 4. Specifically, when the first grab bucket 31 and the second grab bucket 32 ​​are opened or closed, the first grab bucket 31 and the second grab bucket 32 ​​will drive the grab bucket connecting rod 33 to swing. The grab bucket connecting rod 33 will then rotate around the first connecting rod hole 331. Therefore, the first connecting rod hole 331 is the rotation center of the grab bucket connecting rod 33. The encoder lead-out shaft 41 is fixedly connected to the first rotating shaft 112, which passes through the first connecting rod hole 331 and the connecting lug hole, via a coupling 42. The first rotating shaft 112 is fixedly connected to the grab bucket connecting rod 33. Through the transitional action of the coupling 42 and the first rotating shaft 112, the encoder lead-out shaft 41 is fixedly connected to the grab bucket connecting rod 33. Thus, when the grab bucket connecting rod 33 rotates, the rotation center of the grab bucket connecting rod 33 drives the encoder lead-out shaft 41 to rotate, synchronously driving the encoder lead-out shaft 41 to rotate. In this embodiment, both the first grab bucket 31 and the second grab bucket 32 ​​are connected to an encoder 4.

[0051] The telescopic device 2 drives the first grab bucket 31 and the second grab bucket 32 ​​to open or close synchronously through the linkage mechanism 5.

[0052] The push rod rear support 1 is a quadrilateral square plate, and the telescopic device 2 is located on the lower end face of the push rod support. An encoder mounting bracket 12 is provided on the push rod rear support 1, and the encoder 4 is fixedly mounted on the push rod rear support 1 through the encoder mounting bracket 12.

[0053] The push rod rear support 1 has several lifting rings 133 distributed on it, and each lifting ring 13 has a lifting ring 13 hole. The lifting ring 13 holes are connected to the crane through the lifting rope. The lifting rings 13 facilitate the fixed connection between the lifting rope and the push rod rear support 1.

[0054] The linkage mechanism 5 includes a push rod front support 51 connected to the output end of the telescopic device 2. The push rod front support 51 is provided with two support ear plates 511 and support ear holes 512. A first through hole 21 is provided at the end of the output end of the telescopic device 2. The output end of the telescopic device 2 is located between the two support ear plates 511. The rotating shaft passes through the support ear holes 512 and the first through hole 21, so that the output end of the telescopic device 2 is rotatably connected to the end of the push rod front support 51.

[0055] A first drive rod 52 and a second drive rod 53 are hinged to the front support 51 of the push rod; the first drive rod 52 is hinged to the grab bucket connecting rod 33 on the first grab bucket 31; the second drive rod 53 is hinged to the grab bucket connecting rod 33 on the second grab bucket 32.

[0056] When the output end of the telescopic device 2 extends outward, driving the front support 51 of the push rod to move outward, the first drive rod 52 and the second drive rod 53 can cause the first grab bucket 31 and the second grab bucket 32 ​​to open. Conversely, when the output end of the telescopic device 2 retracts inward, driving the front support 51 of the push rod to move inward, the first drive rod 52 and the second drive rod 53 can cause the first grab bucket 31 and the second grab bucket 32 ​​to close. Therefore, the opening and closing of the first grab bucket 31 and the second grab bucket 32 ​​can be achieved through the telescopic action of the telescopic device 2.

[0057] Both the first grab bucket 31 and the second grab bucket 32 ​​are connected to two grab bucket connecting rods 33, and both grab bucket connecting rods 33 are hinged to the push rod rear support 1. That is to say, the first grab bucket 31 and the second grab bucket 32 ​​are both hinged to the push rod rear support 1 through two grab bucket connecting rods 33, and the two grab bucket connecting rods 33 are respectively connected to the two ends of the first grab bucket 31 and the second grab bucket 32, so that the first grab bucket 31 and the second grab bucket 32 ​​can be connected more firmly.

[0058] Correspondingly, two first drive rods 52 are also provided. The two first drive rods 52 are hinged to both ends of the push rod front support 51, and the two first drive rods 52 are respectively hinged to the two grab bucket connecting rods 33 on the first grab bucket 31.

[0059] Two second drive rods 53 are also provided. The two second drive rods 53 are hinged to both ends of the push rod front support 51. The two second drive rods 53 are respectively hinged to the two grabs on the second grab bucket 32.

[0060] The telescopic device 2 can be driven by a hydraulic cylinder; in this embodiment, the telescopic device 2 is an electric push rod. The output end of the electric push rod is connected to the front support 51 of the push rod, and the front support 51 of the push rod is rotatably connected to the output end of the electric push rod.

[0061] The working principle of this utility model is as follows: When the output end of the telescopic device 2 extends outward, driving the front support 51 of the push rod to move outward, the first drive rod 52 and the second drive rod 53 can cause the first grab bucket 31 and the second grab bucket 32 ​​to open; when the output end of the telescopic device 2 retracts inward, driving the front support 51 of the push rod to move inward, the first drive rod 52 and the second drive rod 53 can cause the first grab bucket 31 and the second grab bucket 32 ​​to close. Therefore, through the telescopic action of the telescopic device 2, the opening and closing of the first grab bucket 31 and the second grab bucket 32 ​​can be realized.

[0062] When the first grab bucket 31 and the second grab bucket 32 ​​open or close, they drive the grab bucket connecting rod 33 to swing. The grab bucket connecting rod 33 then rotates around the first connecting rod hole 331, making the first connecting rod hole 331 the rotation center of the grab bucket connecting rod 33. The encoder lead-out shaft 41 is fixedly connected to the grab bucket connecting rod 33. Thus, when the grab bucket connecting rod 33 rotates, it drives the encoder lead-out shaft 41 to rotate. When the encoder lead-out shaft 41 rotates, the encoder 4 records pulse values, which are used to determine the opening degree of the first grab bucket 31 and the second grab bucket 32.

[0063] The working principle of encoder 4 in detecting the opening degree of the grab bucket is as follows: First, the first grab bucket 31 and the second grab bucket 32 ​​are fully closed, and the cumulative pulse value 'a' of encoder 4 at this time is recorded. Then, the first grab bucket 31 and the second grab bucket 32 ​​are opened to the maximum horizontal opening, and the cumulative pulse value 'b' of encoder 4 is recorded again. The opening value can be approximately regarded as a linear change. When the first grab bucket 31 and the second grab bucket 32 ​​are fully closed, the opening degree is defined as 0. When the first grab bucket 31 and the second grab bucket 32 ​​are opened to the maximum horizontal opening, it is 100%. The change ratio is calculated as: k = (ba) / 100. The current cumulative pulse value of encoder 4 is recorded as c, and the real-time opening value is S = (ca) / k. This is used to detect the opening degree.

[0064] In this application, the first grab bucket 31 and the second grab bucket 32 ​​are used in conjunction with the encoder 4 to realize the real-time detection of the opening degree of the first grab bucket 31 and the second grab bucket 32. This enables the automatic detection and display of the opening and closing degree of the grab buckets during manual on-site operation, and realizes closed-loop control of the grab bucket operation during remote automatic operation, providing a technical basis for the remote fully automatic control of cranes.

[0065] Example 2: Refer to Figures 1 to 5 As shown, a gantry crane grab bucket includes:

[0066] Push rod rear support 1, and a telescopic device 2 is provided on push rod rear support 1;

[0067] The grab bucket assembly 3 includes a first grab bucket 31 and a second grab bucket 32 ​​that cooperate with each other. Both the first grab bucket 31 and the second grab bucket 32 ​​are hinged to the push rod rear support 1 via the grab bucket connecting rod 33. A connecting lug hole 111 is provided on the push rod rear support 1. A connecting lug hole 111 is provided through the connecting lug hole 111. A first connecting rod hole 331 is provided at the end of the grab bucket connecting rod 33. A first rotating shaft 112 passes through the first connecting rod hole 331 and the connecting lug hole, so that the connecting lug hole 11111 is hinged to the grab bucket connecting rod 33.

[0068] The opening detection device includes an encoder 4, which has an encoder lead-out shaft 41. The encoder lead-out shaft 41 passes through the rotation center of the grab bucket connecting rod 33 and is fixedly connected to the grab bucket connecting rod 33. In this embodiment, the first grab bucket 31 and the second grab bucket 32 ​​are each connected to an encoder 4. Specifically, when the first grab bucket 31 and the second grab bucket 32 ​​are opened or closed, the first grab bucket 31 and the second grab bucket 32 ​​will drive the grab bucket connecting rod 33 to swing. The grab bucket connecting rod 33 will then rotate around the first connecting rod hole 331. Therefore, the first connecting rod hole 331 is the rotation center of the grab bucket connecting rod 33. The encoder lead-out shaft 41 is fixedly connected to the first rotating shaft 112, which passes through the first connecting rod hole 331 and the connecting lug hole, via a coupling 42. The first rotating shaft 112 is fixedly connected to the grab bucket connecting rod 33. Through the transitional action of the coupling 42 and the first rotating shaft 112, the encoder lead-out shaft 41 is fixedly connected to the grab bucket connecting rod 33. Thus, when the grab bucket connecting rod 33 rotates, the rotation center of the grab bucket connecting rod 33 drives the encoder lead-out shaft 41 to rotate, synchronously driving the encoder lead-out shaft 41 to rotate. In this embodiment, both the first grab bucket 31 and the second grab bucket 32 ​​are connected to an encoder 4.

[0069] The telescopic device 2 drives the first grab bucket 31 and the second grab bucket 32 ​​to open or close synchronously through the linkage mechanism 5.

[0070] The push rod rear support 1 is a quadrilateral square plate, and the telescopic device 2 is located on the lower end face of the push rod support. An encoder mounting bracket 12 is provided on the push rod rear support 1, and the encoder 4 is fixedly mounted on the push rod rear support 1 through the encoder mounting bracket 12.

[0071] The push rod rear support 1 has several lifting rings 133 distributed on it, and each lifting ring 13 has a lifting ring 13 hole. The lifting ring 13 holes are connected to the crane through the lifting rope. The lifting rings 13 facilitate the fixed connection between the lifting rope and the push rod rear support 1.

[0072] The linkage mechanism 5 includes a push rod front support 51 connected to the output end of the telescopic device 2. The push rod front support 51 is provided with two support ear plates 511 and support ear holes 512. A first through hole 21 is provided at the end of the output end of the telescopic device 2. The output end of the telescopic device 2 is located between the two support ear plates 511. The rotating shaft passes through the support ear holes 512 and the first through hole 21, so that the output end of the telescopic device 2 is rotatably connected to the end of the push rod front support 51.

[0073] A first drive rod 52 and a second drive rod 53 are hinged to the front support 51 of the push rod; the first drive rod 52 is hinged to the grab bucket connecting rod 33 on the first grab bucket 31; the second drive rod 53 is hinged to the grab bucket connecting rod 33 on the second grab bucket 32.

[0074] When the output end of the telescopic device 2 extends outward, driving the front support 51 of the push rod to move outward, the first drive rod 52 and the second drive rod 53 can cause the first grab bucket 31 and the second grab bucket 32 ​​to open. Conversely, when the output end of the telescopic device 2 retracts inward, driving the front support 51 of the push rod to move inward, the first drive rod 52 and the second drive rod 53 can cause the first grab bucket 31 and the second grab bucket 32 ​​to close. Therefore, the opening and closing of the first grab bucket 31 and the second grab bucket 32 ​​can be achieved through the telescopic action of the telescopic device 2.

[0075] Both the first grab bucket 31 and the second grab bucket 32 ​​are connected to two grab bucket connecting rods 33, and both grab bucket connecting rods 33 are hinged to the push rod rear support 1. That is to say, the first grab bucket 31 and the second grab bucket 32 ​​are both hinged to the push rod rear support 1 through two grab bucket connecting rods 33, and the two grab bucket connecting rods 33 are respectively connected to the two ends of the first grab bucket 31 and the second grab bucket 32, so that the first grab bucket 31 and the second grab bucket 32 ​​can be connected more firmly.

[0076] Correspondingly, two first drive rods 52 are also provided. The two first drive rods 52 are hinged to both ends of the push rod front support 51, and the two first drive rods 52 are respectively hinged to the two grab bucket connecting rods 33 on the first grab bucket 31.

[0077] Two second drive rods 53 are also provided. The two second drive rods 53 are hinged to both ends of the push rod front support 51. The two second drive rods 53 are respectively hinged to the two grabs on the second grab bucket 32.

[0078] The telescopic device 2 can be driven by a hydraulic cylinder; in this embodiment, the telescopic device 2 is an electric push rod. The output end of the electric push rod is connected to the front support 51 of the push rod, and the front support 51 of the push rod is rotatably connected to the output end of the electric push rod.

[0079] This embodiment is similar in structure to that in Embodiment 1, except that the output end of the electric push rod is an electric push shaft 22, which includes a first push shaft 23 and a second push shaft 24. One end of the second push shaft 24 is rotatably connected to the front support 51 of the push rod, and the other end of the second push shaft 24 is provided with a push shaft hole 241. One end of the first push shaft 23 is slidably disposed in the hole of the second push shaft 24, and the other end of the first push shaft 23 is connected to the interior of the electric push rod. A plurality of pin holes 242 are provided in the circumferential direction of the side wall of the push shaft hole 241, and a telescopic pin 231 that cooperates with the plurality of pin holes 242 is provided on the outer side wall of the first push shaft 23.

[0080] A plurality of mounting holes 232 are provided on the outer side wall of the first push shaft 23. The telescopic pin 231 is slidably disposed in the mounting hole 232. A thrust spring 233 is provided between the telescopic pin 231 and the bottom of the mounting hole 232. The thrust spring 233 pushes the telescopic pin 231 to move toward the opening of the mounting hole 232.

[0081] In this embodiment, under normal use, the electric push rod receives a command from the encoder 4, enabling the first grab 31 and the second grab 32 to open and close normally. At this time, the telescopic pin 231 is locked in the pin hole 242, and there is no relative movement between the first push shaft 23 and the second push shaft 24. The first push shaft 23 and the second push shaft 24 are equivalent to a single push rod.

[0082] When the encoder 4 malfunctions in detecting the opening angle, the electric push shaft 22 may extend too far or shorten too much. This can easily cause the first gripper 31 and the second gripper 32 to clamp too tightly or open at too large an angle, resulting in damage to related parts. In this embodiment, when the above situation occurs, due to the excessive pulling or pushing force of the first push shaft 23, the telescopic pin 231 overcomes the elastic force of the thrust spring 233, the telescopic pin 231 retracts, and disengages from the pin hole 242. At this time, the first push shaft 23 can move within the push shaft hole 241, and the first push shaft 23 slides relative to the second push shaft 24. This avoids damage to related parts caused by the first gripper 31 and the second gripper 32 clamping too tightly or opening at too large an angle.

[0083] The working principle of this utility model is as follows: When the output end of the telescopic device 2 extends outward, driving the front support 51 of the push rod to move outward, the first drive rod 52 and the second drive rod 53 can cause the first grab bucket 31 and the second grab bucket 32 ​​to open; when the output end of the telescopic device 2 retracts inward, driving the front support 51 of the push rod to move inward, the first drive rod 52 and the second drive rod 53 can cause the first grab bucket 31 and the second grab bucket 32 ​​to close. Therefore, through the telescopic action of the telescopic device 2, the opening and closing of the first grab bucket 31 and the second grab bucket 32 ​​can be realized.

[0084] When the first grab bucket 31 and the second grab bucket 32 ​​open or close, they drive the grab bucket connecting rod 33 to swing. The grab bucket connecting rod 33 then rotates around the first connecting rod hole 331, making the first connecting rod hole 331 the rotation center of the grab bucket connecting rod 33. The encoder lead-out shaft 41 is fixedly connected to the grab bucket connecting rod 33. Thus, when the grab bucket connecting rod 33 rotates, it drives the encoder lead-out shaft 41 to rotate. When the encoder lead-out shaft 41 rotates, the encoder 4 records pulse values, which are used to determine the opening degree of the first grab bucket 31 and the second grab bucket 32.

[0085] The working principle of encoder 4 in detecting the opening degree of the grab bucket is as follows: First, the first grab bucket 31 and the second grab bucket 32 ​​are fully closed, and the cumulative pulse value 'a' of encoder 4 at this time is recorded. Then, the first grab bucket 31 and the second grab bucket 32 ​​are opened to the maximum horizontal opening, and the cumulative pulse value 'b' of encoder 4 is recorded again. The opening value can be approximately regarded as a linear change. When the first grab bucket 31 and the second grab bucket 32 ​​are fully closed, the opening degree is defined as 0. When the first grab bucket 31 and the second grab bucket 32 ​​are opened to the maximum horizontal opening, it is 100%. The change ratio is calculated as: k = (ba) / 100. The current cumulative pulse value of encoder 4 is recorded as c, and the real-time opening value is S = (ca) / k. This is used to detect the opening degree.

[0086] In this application, the first grab bucket 31 and the second grab bucket 32 ​​are used in conjunction with the encoder 4 to realize the real-time detection of the opening degree of the first grab bucket 31 and the second grab bucket 32. This enables the automatic detection and display of the opening and closing degree of the grab buckets during manual on-site operation, and realizes closed-loop control of the grab bucket operation during remote automatic operation, providing a technical basis for the remote fully automatic control of cranes.

[0087] The embodiments described above are merely preferred solutions of this utility model and are not intended to limit this utility model in any way. Other variations and modifications are possible without departing from the technical solutions described in the claims.

Claims

1. A gantry crane grab bucket, characterized in that, include: The push rod rear support is equipped with a telescopic device. The grab assembly includes a first grab and a second grab that cooperate with each other. Both the first grab and the second grab are hinged to the push rod rear support via grab connecting rods. The opening detection device includes an encoder, which has an encoder lead-out shaft that passes through the rotation center of the grab bucket link and is fixedly connected to the grab bucket link. The telescopic device drives the first and second grabs to open or close synchronously via a linkage mechanism.

2. The gantry crane grab bucket according to claim 1, characterized in that, An encoder mounting bracket is provided on the rear support of the push rod, and the encoder is fixedly mounted on the rear support of the push rod through the encoder mounting bracket.

3. The gantry crane grab bucket according to claim 1, characterized in that, The linkage mechanism includes a push rod front support connected to the output end of the telescopic device, and a first drive rod and a second drive rod are hinged on the push rod front support; The first drive rod is hinged to the grab bucket connecting rod on the first grab bucket; The second drive rod is hinged to the grab linkage on the second grab.

4. The gantry crane grab bucket according to any one of claims 1 to 3, characterized in that, Both the first and second grabs are connected to two grab linkages, and both grab linkages are hinged to the push rod rear support.

5. The gantry crane grab bucket according to claim 4, characterized in that, There are two first drive rods, which are hinged to both ends of the push rod front support. The two first drive rods are respectively hinged to the two grab bucket connecting rods on the first grab bucket. There are two second drive rods, which are hinged to both ends of the push rod front support. The two second drive rods are respectively hinged to the two grabs on the second grab bucket.

6. The gantry crane grab bucket according to any one of claims 1 to 3, characterized in that, Several lifting rings are distributed on the rear support of the push rod, and several lifting rings are connected to lifting ring holes.

7. The gantry crane grab bucket according to any one of claims 1 to 3, characterized in that, The telescopic device is an electric push rod, and the output end of the electric push rod is an electric push shaft. The electric push shaft includes a first push shaft and a second push shaft. The end of the second push shaft is provided with a push shaft hole, and the first push shaft is slidably disposed in the second push shaft hole. Several pin holes are provided in the circumferential direction of the side wall of the push shaft hole, and telescopic pins that cooperate with the several pin holes are provided on the outer side wall of the first push shaft.

8. The gantry crane grab bucket according to claim 7, characterized in that, Several mounting holes are provided on the outer side wall of the first push shaft. The telescopic pin is slidably disposed in the mounting holes. A thrust spring is provided between the telescopic pin and the bottom of the mounting hole. The thrust spring pushes the telescopic pin to move toward the opening of the mounting hole.

9. The gantry crane grab bucket according to any one of claims 1 to 3, characterized in that, Two sets of encoders are set up, and the two sets of encoders are respectively arranged on the diagonal of the push rod shaft support.

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