Adjustable limiting structure and excavator

Abstract

The adjustable limiting structure comprises a movable arm and a rotary platform, the movable arm is rotationally installed on the rotary platform, the rotary platform comprises a bottom plate and a main beam perpendicularly welded to the bottom plate, and the main beam is connected with the movable arm in a sleeved mode. The limiting sensor is arranged on the movable arm; the limiting adjustment fixing seat is welded on the main beam on one side; a groove is formed in the limiting adjustment fixing base, a bolt penetrates through the groove to be connected with a limiting adjustment 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 adjustment plate. According to the limiting device, the limiting height of the movable arm can be adjusted, so that the position of the limiting device of the movable arm can be adjusted according to actual working conditions, and the applicability of the excavator is improved.

Description

Technical Field

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

[0002] An excavator is an important mechanical equipment in the process of earthwork operations. It is often an earthwork machine that uses a bucket to excavate materials above or below the machine surface and load them into a transport vehicle or unload them to a designated position. For example, an excavator is used to excavate and transport soil and gravel, etc. The operating environment of an excavator is complex and changeable, and not all working conditions are carried out in an open space. When an excavator is operating in a narrow space, the operating range (operating height) of the excavator should be restricted to prevent the excavator from damaging surrounding personnel, relevant auxiliary facilities and the excavator body during the operation. For example, when using an excavator for railway ballast cleaning operations, it is necessary to avoid buildings and high-voltage lines above the railway track to avoid collisions to ensure the safety of operating personnel.

[0003] Currently, there is generally a lack of a dedicated limit device for restricting the operating height on existing excavators, which poses certain safety hazards when operating in specific environments. A very small number of excavators are equipped with limit devices. For example, a limit device for an excavator and an excavator having the same are disclosed in the patent application number 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 adjustment 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 operating height of the excavator to a certain extent, it uses a mechanical limit method. Not only is the form of the limit device single, but over time, the mechanical limit will affect the structural strength of the excavator, and the strength of the mechanical limit itself will also weaken. Once this single limit device fails, the operating safety of the excavator cannot be guaranteed. In addition, although the limit height of the limit structure in the prior art can be adjusted, the position of the limit device is inconvenient to adjust and cannot be adjusted according to the actual working conditions, resulting in poor applicability. Therefore, how to solve the influence caused by the mechanical limit method (single limit form) on the excavator, and how to solve the problem that the existing limit structure cannot flexibly adjust the position of the limit device according to the actual working conditions are difficult problems that need to be solved by those skilled in the art. Summary of the Utility Model

[0004] In view of the deficiencies in the existing technology, the utility model provides an adjustable limit structure and an excavator. Through the limit sensor installed on the boom for electronic limit, the influence brought by mechanical limit is eliminated. At the same time, by opening a groove on the limit adjustment fixing plate, the position of the limit adjustment plate can be adjusted, so as to realize the adjustment of the limit height of the boom.

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

[0006] In the first aspect, the utility model provides an adjustable limit structure, 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 vertically welded to the bottom plate. It is characterized in that it includes: a limit sensor arranged on the boom and a limit adjustment plate fixing seat welded to one side of the main beam; a pin shaft is arranged at the lower end of the boom;

[0007] A groove is opened on the limit adjustment plate fixing seat, and a limit adjustment plate is connected through a bolt passing through the groove. 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.

[0008] As a further technical solution, the center of the circle corresponding to the center line of the groove is located on the axis of the pin shaft.

[0009] As a further technical solution, a pin shaft is arranged at the lower end of the boom, and the boom is hinged to the two side main beams of the slewing platform through the pin shaft.

[0010] As a further technical solution, the limit adjustment plate can rotate around the axis of the pin shaft.

[0011] As a further technical solution, the limit adjustment plate is a bent plate, and a stop notch is arranged on the surface in contact with the limit adjustment plate fixing seat.

[0012] As a further technical solution, a small bend is arranged on the surface of the limit adjustment plate in contact with the limit adjustment plate fixing seat, and the small bend is tangent to the outer edge of the limit adjustment plate fixing seat.

[0013] As a further technical solution, a limit sensor mounting seat is welded to one end of the boom close to the slewing platform, and the limit sensor is fastened to the limit sensor mounting seat through a limit sensor fixing bolt.

[0014] As a further technical solution, a limit sensor plug-in is connected to the side of the limit sensor away from the limit sensor induction device.

[0015] As a further technical solution, the limit adjustment plate fixing seat is arranged in an arc plate structure.

[0016] In a second aspect, the present utility model provides an excavator, which includes an adjustable limit structure as provided in the first aspect.

[0017] One or more technical solutions of the present utility model have the following beneficial effects:

[0018] 1. First, the present utility model solves the technical problem in the prior art that there is a lack of a dedicated limit device for restricting the operating height of an excavator. Second, the present utility model is designed and installed with a limit sensor on the boom, and the limit sensor sensing device on the limit sensor contacts the limit adjustment plate to achieve height limitation of the boom, thus solving the impact of mechanical limitation on the structural strength of the excavator.

[0019] 2. The present utility model also opens a groove on the limit fixing plate, and the limit adjustment plate is connected through the groove by bolts. By adjusting the position of the limit adjustment plate on the groove, the position where the limit sensor sensing device contacts the limit adjustment plate is adjusted, thereby realizing the adjustment of the limit height of the boom. This enables the present utility model to adjust the position of the limit device of the boom according to the actual working conditions, improving the applicability of the excavator. And the limit device can also be cancelled to be used normally in an open environment, simultaneously improving the equipment utilization rate. Description of the Drawings

[0020] The specification drawings constituting a part of the present utility model 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 of the present utility model.

[0021] Figure 1 It is a structural schematic diagram of the adjustable limit structure of the present utility model;

[0022] Figure 2 It is an enlarged view of the electronic limit part of the adjustable limit structure of the present utility model;

[0023] Figure 3 It is a structural diagram of the slewing platform in the adjustable limit structure of the present utility model;

[0024] Figure 4 It is a side view of the limit adjustment plate fixing seat in the adjustable limit structure of the present utility model;

[0025] Wherein: 1. Boom; 2. Limit sensor mounting base; 3. Limit sensor; 31. Limit sensor sensing device; 32. Limit sensor connector; 4. Limit sensor fixing bolt; 5. Pin; 51. Pin pressing plate; 52. Fixing bolt; 6. Limit adjusting plate fixing base; 61. Groove; 62. Outer edge of the limit adjusting plate fixing base; 63. Connecting line between the axis of pin 5 and the axis of bolt 9; 7. Limit adjusting plate; 71. Stop notch; 72. Small bend; 8. Nut; 9. Bolt; 10. Slewing platform. Detailed implementation mode

[0026] It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the present utility model. Unless otherwise specified, all technical and scientific terms used in the present utility model have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present utility model belongs.

[0027] Embodiment 1

[0028] An adjustable limit structure provided by the present utility model, since the position of the limit device of the existing limit structure is inconvenient to adjust and the applicability is poor, so this embodiment is an improvement on the existing structure. The existing structure includes a boom 1 and a slewing platform 10. 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 Figure 1 As shown in the structural schematic diagram of the adjustable limit structure, it includes a limit sensor 3 arranged on the boom 1 and a limit adjusting plate fixing base 6 welded to one of the main beams. The limit adjusting plate fixing base 6 is arranged in an arc plate structure. A pin 5 is provided at the lower end of the boom 1. Among them, a groove 61 is opened on the limit adjusting plate fixing base 6, and the center of the circle corresponding to the center line of the groove 61 is located on the axis line of the pin 5. A limit adjusting plate 7 is connected through the groove by a bolt 9, and the limit adjusting plate 7 is fastened to the limit adjusting plate fixing base 6 with a nut. And a limit sensor sensing device 31 is connected to the limit sensor 3, and the limit sensor sensing device 31 extends to one side of the limit adjusting plate 7. When the limit sensor sensing device 31 contacts the limit adjusting plate 7, the boom 1 reaches the limit height. Since the groove 61 is opened on the limit adjusting plate fixing base 6, the position of the limit adjusting plate 7 on the groove 61 can be adjusted, and then the position where the limit sensor sensing device 31 contacts the limit adjusting plate 7 can be adjusted, so as to realize the adjustment of the limit height of the boom 1. Thus, on the one hand, the present utility model solves the influence of mechanical limit on the structural strength of the excavator, and on the other hand, it solves the problem that the position of the limit device of the boom cannot be adjusted according to the actual working conditions in the prior art. The present utility model enhances the applicability of the excavator.

[0029] In this embodiment, as Figure 2As shown, at one end of the boom 1 close to the slewing platform, a limit sensor mounting seat 2 is welded. The limit sensor 3 is fastened to the limit sensor mounting seat 2 by limit sensor fixing bolts 4. And on one side of the limit sensor 3 away from the limit sensor sensing device 31, a limit sensor connector 32 is connected. When the limit sensor sensing device 31 contacts the limit adjusting plate, a limit signal is generated. The limit sensor 3 detects the limit signal and is connected to the vehicle body wiring harness through the limit sensor connector 32 and transmitted to the whole machine controller to issue relevant instructions. It should be noted here that the above process of limit signal transmission is not protected by the present utility model. The above process is prior art and can be achieved by using existing sensors and sensor connectors.

[0030] The limit adjusting plate 7 is a bent plate, and a crack stop opening 71 is provided on the surface contacting the limit adjusting plate fixing seat 6 to prevent the bent plate (limit adjusting plate 7) from tearing. Since the limit adjusting plate 7 is only fixed in the groove of the limit adjusting plate fixing seat 6 by a single bolt. In this embodiment, as Figure 4 shown, a small bend 72 is provided on the surface of the limit adjusting plate 7 contacting the limit adjusting plate fixing seat 6, and the small bend is tangent to the outer edge 62 of the limit adjusting plate fixing seat to prevent the limit adjusting plate 7 from loosening from the limit adjusting plate fixing seat 6 due to being fixed by a single bolt.

[0031] As Figure 3 shown, the pin shaft 5, through the pin shaft pressing plate 51 and the fixing bolt 52, enables the boom 1 to be hinged to the two side main beams of the slewing platform 10 through the pin shaft 5. And since the center of the circle corresponding to the groove center line is located on the axis of the pin shaft, the limit adjusting plate can rotate around the axis of the pin shaft. Since the boom 1 rotates around the axis of the pin shaft 5, the limit sensor 3 and the limit sensor sensing device 31 fixed on the boom 1 rotate synchronously around the axis of the pin shaft 5 with the boom 1. Therefore, when the limit adjusting plate 7 is fastened at any position on the limit adjusting plate fixing seat 6, it can ensure that the limit sensor sensing device 31 contacts the limit adjusting plate 7. Different positions of the maximum height that the boom 1 can reach can be calibrated on the limit adjusting plate fixing seat 6 according to the connection line 63 between the axis of the pin shaft 5 and the axis of the bolt 9, so as to quickly adjust the boom limit position.

[0032] The specific working principle of the adjustable limit structure in this embodiment is:

[0033] Adjustable electronic limit: The boom 1 of the excavator rotates around the axis of the pin shaft 5. When the limit sensor sensing device 31 contacts the limit adjustment plate 7, it indicates that the boom has reached the maximum height, that is, the limit height of the boom 1. In this embodiment, this limit height can be adjusted according to the actual working conditions. The specific adjustment method is as follows: According to the actual excavation working conditions at the operation site, by adjusting the position of the limit adjustment plate 7 in the groove 61 of the limit adjustment plate fixing seat 6, and then adjusting the contact position between the limit sensor sensing device 31 and the limit adjustment plate 7, so as to adjust the limit height of the boom.

[0034] Embodiment 2

[0035] In this embodiment, an excavator is provided, which includes an adjustable limit structure 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.

[0036] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An adjustable limiting structure, comprising: A movable arm and a slewing platform, wherein the movable arm is rotatably mounted on the slewing platform, and the slewing platform comprises a bottom plate and a main beam vertically welded to the bottom plate, and is characterized in that it comprises: a limit sensor arranged on the movable arm and a limit adjustment plate fixing seat welded on one side of the main beam; a pin is arranged at the lower end of the movable arm; A groove is provided on the limit adjustment plate fixing seat, and the limit adjustment plate is connected by bolts passing through the groove. The limit sensor is connected to a limit sensor sensing device, and the limit sensor sensing device extends to one side of the limit adjustment plate.

2. An adjustable limiting structure according to claim 1, characterized in that: The center of the circle corresponding to the center line of the groove is located on the axis line of the pin.

3. The adjustable limiting structure according to claim 1, characterized in that: The movable arm is hinged on the main beams on both sides of the revolving platform through a pin shaft.

4. An adjustable limiting structure as claimed in claim 3, characterized in that: The limit adjustment plate can rotate around the axis of the pin shaft.

5. The adjustable limiting structure according to claim 1, characterized in that: The limit adjustment plate is a bent plate, and a crack stopper is provided on the surface in contact with the limit adjustment plate fixing seat.

6. The adjustable limiting structure according to claim 5, characterized in that: A small bend is arranged on the surface where the limit adjustment plate contacts the limit adjustment plate fixing seat, and the small bend is tangent to the outer edge of the limit adjustment plate fixing seat.

7. The adjustable limiting structure according to claim 1, characterized in that: A limit sensor mounting seat is welded to one end of the movable arm close to the rotary platform, and the limit sensor is fastened to the limit sensor mounting seat by a limit sensor fixing bolt.

8. The adjustable limiting structure according to claim 1, characterized in that: A limit sensor connector is connected to a side of the limit sensor away from the limit sensor sensing device.

9. The adjustable limiting structure according to claim 1, characterized in that: The position limiting adjustment plate fixing seat is configured as an arc-shaped plate structure.

10. An excavator, characterized in that: It comprises an adjustable limiting structure as described in any one of claims 1 to 9.

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