Limiting structure of excavator working device and excavator

Abstract

The utility model discloses a limiting structure of an excavator working device and an excavator. The limiting structure comprises a movable arm limiting lug plate welded to a movable arm, a limiting sensor arranged on the movable arm, a platform limiting lug plate welded to a bottom plate of a rotary platform and a limiting adjusting fixing plate welded to a main beam on one side. A steel wire rope is connected between the movable arm limiting lug plate and the platform limiting lug plate; the limiting adjusting fixing plate is fixedly connected with a limiting adjusting plate, the limiting sensor is connected with a limiting sensor induction device, and the limiting sensor induction device extends to one side of the limiting adjusting plate. The limiting structure ensures that electronic limiting is preferentially triggered by mechanical limiting, the influence of mechanical limiting on the strength of the movable arm and the excavator can be effectively reduced, meanwhile, the possibility that the excavator breaks down in a special environment due to failure of a single limiting device is avoided, and the operation safety of the excavator is greatly improved.

Description

Technical Field

[0001] The utility model relates to the technical field of excavator limit, in particular to a limit structure for an excavator working device and an excavator. Background Art

[0002] An excavator is a kind of machinery widely used in earthwork construction. For example, it is used to carry soil and gravel. The working environment of the excavator is complex and changeable. Not all working conditions are carried out in an open space. When the excavator is working in a narrow space, the working range (working height) of the excavator should be limited to prevent the excavator from damaging the surrounding personnel, relevant auxiliary facilities and the excavator body during the operation. For example, when using an excavator for railway ballast cleaning operation, it is necessary to avoid the buildings and high-voltage lines above the railway track to avoid collisions to ensure the safety of the operators.

[0003] Currently, there is generally a lack of a special limit device for limiting the working height on existing excavators, which poses certain safety hazards when operating in specific environments. There are very few excavators equipped with limit devices. For example, a limit device for an excavator and an excavator having the same are disclosed in the patent application No. CN215165929U. Specifically, a fixed block fixedly arranged on the excavator body is disclosed, a first top block is movably arranged on the fixed block, and a position adjusting mechanism is arranged between the first top block and the fixed block; a switch structure is arranged on the first top block, and the switch structure controls the movement state of the boom of the excavator; a second top block is fixedly arranged on the boom of the excavator, and a trigger structure cooperating with the switch structure is arranged on the second top block. Although the above patent can limit the working height of the excavator to a certain extent, the limiting means is single, only using the mechanical limiting method. After a long time, the mechanical limit will affect the structural strength of the excavator. Moreover, if the mechanical limit fails, there are no other limiting means, resulting in the inability to guarantee the working safety of the excavator. Summary of the Utility Model

[0004] Aiming at the deficiencies of the existing technology, the utility model provides a limit structure for an excavator working device and an excavator, which realizes the limit of the working height of the excavator by electronic limit through a limit sensor installed on the boom, and at the same time, through limit lugs welded on the boom and the slewing platform, a steel wire rope is connected in the middle for mechanical limit.

[0005] In order to achieve the above purpose, the utility model adopts the following technical scheme:

[0006] On the one hand, the utility model provides a limit structure for an excavator working device, including: a boom and a slewing platform, and the boom is rotatably installed on the slewing platform. The slewing platform includes a bottom plate and a main beam perpendicularly welded to the bottom plate, including: a boom limit ear plate welded on the boom, a limit sensor arranged on the boom, a platform limit ear plate welded on the bottom plate of the slewing platform, and a limit adjustment fixing plate welded on one side main beam; a steel wire rope is connected between the boom limit ear plate and the platform limit ear plate;

[0007] Both ends of the steel wire rope are respectively provided with a first thimble and a second thimble. A first shackle is fixed on the boom limit ear plate, and a second shackle is fixed on the platform limit ear plate. One end of the steel wire rope passes through the first shackle and then passes back into the first thimble; the other end of the steel wire rope passes through the second shackle and then passes back into the second thimble;

[0008] A limit adjustment plate is tightly connected to the limit adjustment fixing plate. A limit sensor induction device is connected to the limit sensor, and the limit sensor induction device extends towards one side of the limit adjustment plate.

[0009] As a further technical solution, the inner side of the end of the boom far from the slewing platform is an arc surface, and the boom limit ear plate is arranged on the arc surface on the inner side of the boom and near the top position.

[0010] As a further technical solution, a pin shaft is arranged at the lower end of the boom. Boom pin shaft installation holes are opened on both side main beams of the slewing platform, and the pin shaft is rotatably installed in the boom pin shaft installation holes.

[0011] As a further technical solution, a limit sensor mounting plate is welded at the end of the boom close to the slewing platform, and the limit sensor is fixedly installed on the limit sensor mounting plate.

[0012] As a further technical solution, a limit sensor socket is connected to the side of the limit sensor far from the limit sensor induction device.

[0013] As a further technical solution, the first thimble and the second thimble are of U-shaped structures.

[0014] As a further technical solution, a limit adjustment plate small bend is arranged on the limit adjustment fixing plate.

[0015] As a further technical solution, the limit adjustment fixing plate is arranged as an arc-shaped flat plate structure.

[0016] As a further technical solution, the boom limit ear plate and the platform limit ear plate are located on the same side and in the same vertical plane.

[0017] In a second aspect, the present utility model provides an excavator, which includes a limiting structure for an excavator working device as provided in the first aspect.

[0018] One or more technical solutions of the present utility model have the following beneficial effects:

[0019] 1. First, the present utility model solves the technical problem in the prior art of lacking a dedicated limiting device for restricting the operating height of an excavator. Secondly, this application involves two limiting means. One is to set a limit sensor on the boom, which cooperates with a limit adjusting plate and a limit sensor sensing device to achieve electronic limiting of the operating height of the excavator. The other is that a steel wire rope is connected between the boom limit ear plate and the platform limit ear plate to achieve mechanical limiting of the operating height of the excavator.

[0020] 2. The length of the steel wire rope in the present utility model can be adjusted by the first clip and the second clip to meet different limiting heights. At the same time, the steel wire rope can also be removed to realize operation in an open space. While meeting the safety requirements of height limits in a specific environment, it can also be flexibly switched to a conventional operation mode, with stronger working condition adaptability and higher equipment utilization rate.

[0021] 3. The present utility model has various limiting means, which solves the problem in the prior art of only mechanically limiting the operating height of an excavator. Based on the structure provided by the present utility model, it ensures that the electronic limit is triggered first, reduces the impact on the strength of structural components (boom and excavator) caused by multiple triggers of the mechanical limit, and can also avoid the possibility of the excavator directly contacting high-voltage lines or other buildings during operation in a special environment (such as railway ballast cleaning operation) due to the failure of a single limiting device, resulting in electric shock accidents or collision accidents, greatly improving the operating safety of the excavator. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The attached drawings forming a part of this specification are used to provide a further understanding of the present utility model. The schematic embodiments of the present utility model and their descriptions are used to explain the present utility model and do not constitute an improper limitation to the present utility model.

[0023] Figure 1 It is a schematic structural diagram of the limiting structure of the excavator working device of the present utility model;

[0024] Figure 2 It is an enlarged view of the limit ear plate of the present utility model;

[0025] Figure 3 It is a partial enlarged view of the limiting structure of the excavator working device of the present utility model;

[0026] Wherein: 1. Boom; 2. Boom limit ear plate; 201. First through hole; 3. Steel wire rope; 4. Limit sensor mounting plate; 5. Limit sensor connector; 6. Platform limit ear plate; 7. Slewing platform; 8. Boom pin mounting hole; 9. Limit sensor sensing device; 10. Limit adjustment fixing plate; 11. Limit adjustment plate; 12. Limit sensor; 13. Small bend of limit adjustment plate; 14. First shackle, 1401. Shackle bolt; 1402. First nut; 1403. Split pin; 15. First clamp; 1501. U-shaped buckle; 1502. Fixed seat; 1503. Second nut. Detailed implementation mode

[0027] It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present invention belongs.

[0028] Embodiment 1

[0029] A limit structure for an excavator working device provided by the present invention is an improvement on the existing structure. The existing structure includes a boom 1 and a slewing platform 7. Among them, the slewing platform includes a bottom plate and main beams perpendicularly welded to the bottom plate. There are two main beams, which are divided into two sides, and the boom is rotatably installed on the slewing platform. The improvement points in this embodiment are as follows: As Figure 1 As shown in the structural schematic diagram of the excavator boom limit structure, it includes a boom limit ear plate 2 welded to the boom 1, a limit sensor 12 provided on the boom 1, a platform limit ear plate 6 welded to the bottom plate of the slewing platform 7, and a limit adjustment fixing plate 10 welded to one of the main beams. And a steel wire rope 3 is connected between the boom limit ear plate 2 and the platform limit ear plate 6. Among them, as Figure 2As shown in the figure, the first clip 15 and the second clip are respectively threaded through both ends of the wire rope. A first shackle is fixed on the boom limit ear plate, and a second shackle is fixed on the platform limit ear plate. The specific fixing method of the first shackle to the boom limit ear plate is as follows: A first through hole is provided on the boom limit ear plate. The first shackle is of a U-shaped structure, with holes provided at both ends of the first shackle, which are aligned with the first through hole. The shackle bolt 1401 passes through the holes at both ends of the first shackle and the first through hole, and is threadedly fixed with the first nut 1402. At the same time, a split pin 1403 is provided at the head of the shackle bolt to prevent the first nut from coming off. The fixing method of the second shackle to the platform limit ear plate is the same as that of the first shackle to the boom limit ear plate, which will not be elaborated here. One end of the wire rope passes through the first shackle and then passes back into the first clip; the other end of the wire rope passes through the second shackle and then passes back into the second clip. Both the first clip and the second clip are of U-shaped structures. Specifically, the first clip 15 includes a U-shaped buckle 1501 and fixing seats 1502 fixed at both ends of the U-shaped buckle. Both ends of the U-shaped buckle pass through the fixing seats and are respectively threadedly connected with two second nuts 1503 to achieve the purpose of tightening the wire rope. The structure of the second clip is the same as that of the first clip, which will not be elaborated here. It can be seen that the length of the wire rope can be adjusted by the first clip and the second clip to meet different limit heights. At the same time, the wire rope can also be removed to realize operation in an open space; while meeting the safety requirements under the height limit of a specific environment, it can be flexibly switched to the conventional operation mode, with stronger working condition adaptability and higher equipment utilization rate. In this embodiment, preferably, the boom limit ear plate and the platform limit ear plate are of the same model, the first clip and the second clip are of the same model, and the first shackle and the second shackle are of the same model, with good general interchangeability of parts.

[0030] Among them, as Figure 3 shown, the limit adjustment fixing plate 10 is fixedly connected with the limit adjustment plate 11. The fastening connection position of the limit adjustment plate 11 can be set according to the appropriate downward movement of the boom by a set height after the wire rope is fully straightened. At this time, the limit adjustment plate 11 is fastened to the limit adjustment fixing plate 10. The limit sensor 12 is connected with the limit sensor induction device 9, and the limit sensor induction device 9 extends to one side of the limit adjustment plate 11. It can be seen that the limit structure in this embodiment can realize two limit methods. One is to set a limit sensor on the boom, cooperate with the limit adjustment plate and the limit sensor induction device to realize electronic limit of the operating height of the excavator; the other is that a wire rope is connected between the boom limit ear plate and the platform limit ear plate to realize mechanical limit of the operating height of the excavator.

[0031] In this embodiment, the limit adjustment fixing plate 10 is arranged in an arc-shaped flat plate structure, and a small bend of the limit adjustment plate 13 is arranged on the limit adjustment fixing plate. The small bend of the limit adjustment plate can be tangent to the outer edge of the limit adjustment fixing plate, preventing the limit adjustment plate from rotating due to only one bolt connecting the nut. On the inner side of one end of the boom 1 close to the slewing platform, a limit sensor mounting plate 4 is welded. The limit sensor 12 is fixedly installed on the limit sensor mounting plate 4. On the side of the limit sensor away from the limit sensor sensing device, a limit sensor plug-in 5 is connected. The limit sensor plug-in 5 is used to supply power to the limit sensor on the one hand, and on the other hand, when the limit sensor sensing device 9 contacts the limit adjustment plate, a limit signal is generated. The limit sensor 12 detects the limit signal and is connected to the vehicle body wiring harness through the limit sensor connector 5 and transmitted to the whole machine controller to issue relevant instructions.

[0032] As Figure 1 As shown in the structural schematic diagram of the boom limit structure of the excavator, the inner side of the end of the boom 1 away from the slewing platform 7 is an arc surface. The boom limit ear plate 2 is arranged on the arc surface inside the boom and close to the top position. The boom limit ear plate 2 and the platform limit ear plate 6 are on the same side and in the same vertical plane. With the steel wire rope connected between the two, mechanical limit of the operating height of the excavator can be achieved. And a pin shaft is provided at the lower end (the end away from the arc surface) of the boom 1. Boom pin mounting holes 8 adapted to the pin shaft are provided on the main beams on both sides of the slewing platform 7. The pin shaft is rotatably installed in the boom pin mounting holes 8, so that the boom 1 can rotate around the center of the boom pin mounting holes 8.

[0033] The specific working principle of the boom limit structure of the excavator in this embodiment is:

[0034] Mechanical limit: By adjusting the length of the steel wire rope 3, the limit height of the boom is adjusted.

[0035] Electronic limit: The boom of the excavator rotates around the center of the boom pin mounting hole. When the limit sensor sensing device 9 contacts the limit adjustment plate 11, it means that the boom reaches the maximum height. That is to say, the maximum height of the boom lift is detected by the contact between the limit sensor sensing device 9 and the limit adjustment plate 11 to achieve the purpose of limiting in the height direction. More preferably, on the premise of ensuring operation safety, the limit height of the steel wire rope 3 is set as a critical value, and the height limited by the limit sensor sensing device 9 is set slightly lower than the height set by the steel wire rope. Setting the limit height in the limit sensor sensing device is the prior art. In this way, it can ensure that the electronic limit is triggered first, and the mechanical limit is triggered after the electronic limit fails, so as to better ensure the safety of the limit device. The limit sensor sensing device and the limit sensor selected in this embodiment are both devices in the prior art.

[0036] Embodiment Two

[0037] In this embodiment, an excavator is provided, which includes a limit structure of an excavator working device as described in Embodiment 1. The specific technical solutions and effects are the same as those in Embodiment 1 and will not be elaborated here. For details, refer to Embodiment 1.

[0038] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. For those skilled in the art, the present utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A limiting structure for an excavator working device, comprising: A boom and a slewing platform, wherein the boom is rotatably mounted on the slewing platform, and the slewing platform includes a bottom plate and a main beam perpendicularly welded to the bottom plate, and is characterized in that it includes: a boom limit ear plate welded on the boom, a limit sensor arranged on the boom, a platform limit ear plate welded on the bottom plate of the slewing platform, and a limit adjustment fixing plate welded on one side main beam; a steel wire rope is connected between the boom limit ear plate and the platform limit ear plate; The two ends of the steel wire rope are respectively provided with a first clip and a second clip, a first shackle is fixed on the boom limit ear plate, a second shackle is fixed on the platform limit ear plate, one end of the steel wire rope passes through the first shackle and then passes back into the first clip; the other end of the steel wire rope passes through the second shackle and then passes back into the second clip; A limit adjustment plate is tightly connected to the limit adjustment fixing plate, a limit sensor induction device is connected to the limit sensor, and the limit sensor induction device extends to one side of the limit adjustment plate.

2. The limit structure of an excavator working device according to claim 1, wherein, The inner side of the end of the boom far from the slewing platform is an arc surface, and the boom limit ear plate is arranged on the arc surface on the inner side of the boom and near the top position.

3. The limit structure of an excavator working device according to claim 1, characterized in that A pin shaft is arranged at the lower end of the boom, and boom pin shaft mounting holes are opened on the two side main beams of the slewing platform, and the pin shaft is rotatably mounted on the boom pin shaft mounting holes.

4. The limit structure of an excavator working device according to claim 1, characterized in that, A limit sensor mounting plate is welded to the end of the boom close to the slewing platform, and the limit sensor is fixedly mounted on the limit sensor mounting plate.

5. The limit structure of an excavator working device according to claim 1, characterized in that, A limit sensor plug-in is connected to the side of the limit sensor far from the limit sensor induction device.

6. The limit structure of an excavator working device according to claim 1, characterized in that, The first clip and the second clip are of U-shaped structures.

7. The limit structure of an excavator working device according to claim 1, characterized in that, A limit adjustment plate small bending is arranged on the limit adjustment fixing plate.

8. The limit structure of an excavator working device according to claim 1, characterized in that, The limit adjustment fixing plate is arranged as an arc-shaped flat plate structure.

9. The limit structure of an excavator working device according to claim 1, characterized in that, The boom limit ear plate and the platform limit ear plate are located on the same side and in the same vertical plane.

10. An excavator, characterized in that, It includes a limit structure of an excavator working device according to any one of claims 1-9.

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