Counterweight assembly structure for excavator

Abstract

The utility model discloses a counter weight assembly structure for an excavator, which belongs to the field of engineering machinery and mainly comprises a frame, a counter weight body is arranged on the frame, an access hole is arranged on the counter weight body, a groove is arranged in the middle of the counter weight body, a fixing plate is arranged in the groove, the fixing plate is matched with the groove, and a nut is fixed on the fixing plate. And the fixed plate is fixed on the frame through a bolt. Compared with a traditional balance weight fixing mode, the fixing device has better stability and installation convenience. Meanwhile, the access hole is formed in the upper middle part of the counter weight, so that parts such as an oil filter and an oil-water separator of the tailless excavator can be conveniently repaired and maintained, the application range of the counter weight is widened, and the counter weight can be matched with the frame to assemble the side door and can be provided with an emergency stop switch.

Description

Technical Field

[0001] This utility model relates to the field of engineering machinery, and more specifically, to a counterweight assembly structure for excavators. Background Technology

[0002] In the field of construction machinery, excavators are indispensable construction machines. The tail counterweight is a crucial part of the excavator's structure, ensuring its stability, safety, and shock resistance in various operating environments. Tailless excavators, adaptable to various confined spaces, are gradually becoming a development trend. To accommodate the structure of tailless excavators, the tail counterweight needs to have a small turning radius and a compact structure.

[0003] Because of the swivel structure of the tailless counterweight, there is no operating space for personnel in the middle area during counterweight installation. Therefore, most tailless counterweights on the market are installed on the frame by fixing the counterweight to both sides with bolts. Although this method is convenient for installation, it results in poor installation stability for large-tonnage counterweights. Some also use a method of pre-embedding threaded steel blocks in the middle area of ​​the counterweight for integral bolt installation. Although this method is convenient for installation, it greatly increases the difficulty of the counterweight casting process.

[0004] In addition, the tailless counterweight has limited functionality and lacks inspection ports, which is not conducive to the maintenance of excavators. Utility Model Content

[0005] The purpose of this invention is to provide a counterweight assembly structure for excavators, which offers better stability and ease of installation compared to traditional counterweight fixing methods. Furthermore, an inspection port is designed in the upper middle part of the counterweight, facilitating the maintenance and repair of components such as the oil filter and oil-water separator in tailless excavators. This also broadens the application of the counterweight, allowing it to be used with the frame to assemble side doors and to be equipped with an emergency stop switch.

[0006] This utility model is achieved through the following technical solution:

[0007] A counterweight assembly structure for an excavator includes a frame, a counterweight body on the frame, an inspection port on the counterweight body, a groove in the middle of the counterweight body, a fixing plate placed in the groove, the fixing plate and the groove being mutually restrained, a nut being fixed on the fixing plate, and the fixing plate being fixed to the frame by bolts.

[0008] Furthermore, the fixing plate includes a limiting block, a nut is welded onto the fixing plate, the limiting block is embedded in a groove, and the groove restricts the rotation of the fixing plate through the limiting block.

[0009] Furthermore, the limiting block is similar in shape to the groove, and gaps are left between the limiting block and the side walls of the groove on both sides.

[0010] Furthermore, the counterweight includes a left counterweight, a middle counterweight, and a right counterweight, the bottoms of which are all fixed to the frame with bolts.

[0011] Furthermore, the counterweight is C-shaped.

[0012] Furthermore, the left counterweight, middle counterweight, and right counterweight are integrally formed.

[0013] Furthermore, the inspection port end face is provided with a rear door and a rear door lock plate; the rear door lock plate is connected to the rear door.

[0014] Furthermore, a rear door shock absorber bracket is provided on the inspection port end face, and a shock absorber pad is provided on the rear door shock absorber bracket, which is connected to the rear door.

[0015] Furthermore, the counterweight is equipped with an emergency stop switch.

[0016] Furthermore, side doors, side door shock absorbers, side door lock plates, and side door guide block brackets are respectively installed on the left and right sides of the counterweight, and the rear door shock absorber, side door lock plates, and side door guide block brackets are connected to the side doors.

[0017] Compared with the prior art, the beneficial effects of this utility model are:

[0018] 1. The left, middle, and right counterweights of this utility model are all bolted to their bottoms, which, compared to the previous method of fixing only on both sides, increases the number of mounting positions and improves the stability and safety of the counterweight fixing. Considering the ease of assembly for workers, the cooperation between the fixing plate and the groove solves the problem of difficult assembly in areas where the counterweight is obstructed. Furthermore, the structure is simple, low-cost, and easy and effective to assemble.

[0019] 2. The counterweight of this utility model is provided with an inspection port and a rear door at the middle and rear, which can facilitate the maintenance and repair of components such as oil filter and oil-water separator of the tailless excavator.

[0020] 3. The emergency stop switch is set at the rear of the counterweight of this utility model, which solves the problem of difficult configuration of emergency stop switch for tailless excavators.

[0021] 4. The counterweight of this utility model has a side door fixed on its side. The side door shock absorber bracket, side door lock plate, and side door guide block bracket are used in conjunction with the excavator frame to assemble the side door. Compared with the traditional side door installation and fixing, which is all concentrated in the excavator hood frame, it saves installation space, is easy to install, and solves the problems of difficult side door installation and tight configuration space in tailless excavators. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the counterweight structure;

[0023] Figure 2 This is a rear view of the counterweight structure;

[0024] Figure 3 This is a schematic diagram of the counterweight installation structure;

[0025] Figure 4 This is a cross-sectional view of the counterweight installation groove;

[0026] In the diagram: 1. Counterweight; 2. Left counterweight; 3. Middle counterweight; 4. Right counterweight; 5. Rear door; 6. Rear door lock plate; 7. Rear door shock absorber bracket; 8. Fixing plate; 9. Nut; 10. Side door guide block bracket; 11. Side door lock plate; 12. Side door shock absorber bracket; 13. Emergency stop switch; 14. Frame; 15. Side door; 16. Groove; 17. Limiting block. Detailed Implementation

[0027] To enable those skilled in the art to better understand the technical solution of this utility model, the technical solution of this utility model will be clearly and completely described below with reference to the accompanying drawings. Based on the embodiments in this application, other similar embodiments obtained by those skilled in the art without creative effort should all fall within the scope of protection of this application. Furthermore, the directional terms mentioned in the following embodiments, such as "up," "down," "left," and "right," are only for reference to the directions in the accompanying drawings. Therefore, the directional terms used are for illustrative purposes and not for limiting the creation of this utility model.

[0028] The present invention will be further described below with reference to the accompanying drawings.

[0029] Example 1: A counterweight assembly structure for an excavator, such as... Figures 1-4 As shown, the device includes a frame 14, on which a counterweight 1 is mounted. The counterweight 1 has an inspection port and a groove 16 in the middle. A fixing plate 8 is placed in the groove 16, and the fixing plate 8 is in a limiting fit with the groove 16. A nut is fixed to the fixing plate 8, and the fixing plate 8 is fixed to the frame 14 by bolts. The counterweight 1 includes a left counterweight 2, a middle counterweight 3, and a right counterweight 4. The bottoms of the left counterweight 2, the middle counterweight 3, and the right counterweight 4 are all fixed to the frame 14 by bolts. In this invention, the bottoms of the left counterweight 2, the middle counterweight 3, and the right counterweight 4 are all fixed with bolts, which, compared to the previous method of fixing only on both sides, increases the mounting positions and improves the stability and safety of the counterweight fixing. Considering the convenience of worker assembly, the cooperation between the fixing plate 8 and the groove 16 can solve the problem of difficult assembly in areas where the counterweight is obstructed. Moreover, the structure is simple, the cost is low, and the assembly is convenient and effective.

[0030] Example 2: A counterweight assembly structure for an excavator, such as... Figure 1As shown, the counterweight 1 is C-shaped. The left counterweight 2, middle counterweight 3, and right counterweight 4 are integrally formed. A rear door 5 and a rear door lock plate 6 are provided on the inspection port end face; the rear door lock plate 6 is connected to the rear door 5. A rear door shock absorber bracket 7 is provided on the inspection port end face, and shock absorber pads are provided on the rear door shock absorber bracket 7, which are connected to the rear door 5. The inspection port and rear door 5 are located at the rear of the counterweight 1, facilitating the maintenance and repair of components such as the oil filter and oil-water separator of the tailless excavator.

[0031] like Figure 3 As shown, the fixing plate 8 includes a limiting block, and a nut 9 is welded onto the fixing plate 8. The limiting block 17 is embedded in the groove 16, and the groove 16 restricts the rotation of the fixing plate 8 through the limiting block 17. The limiting block 17 has a similar shape to the groove 16, and both sides of the limiting block 17 are in contact with the groove 16. During installation, the bolt passes through the frame and engages with the nut 9. When the bolt is tightened at the bottom of the frame, the fixing plate 8 will be subjected to a torque, and there will be a tendency to rotate. At this time, because the limiting block 17 is embedded in the groove 16, there is a gap between both sides of the limiting block 17 and the side walls of the groove 16, which will give the fixing plate 8 a torque in the opposite direction, which can fix the nut 9 and successfully complete the fixing of the middle counterweight 3.

[0032] The counterweight 1 is equipped with an emergency stop switch 13. The emergency stop switch 13 is easy to install and is located at the rear of the counterweight, making it convenient for operators to touch.

[0033] The counterweight 1 has side doors 15, side door shock absorber brackets 12, side door lock plates 11, and side door guide block brackets 10 installed on its left and right sides, respectively. The rear door shock absorber bracket 7, side door lock plates 11, and side door guide block brackets 10 are connected to the side doors 15. Compared to the traditional method where all the installation and fixing of the side doors 15 are concentrated in the excavator hood frame, this saves installation space, facilitates installation, and solves the problems of difficult installation and limited space for the side doors 15 on tailless excavators. Everything else is the same as in Embodiment 1.

[0034] During assembly, first install the bolts at the bottom of the central counterweight 3. The central counterweight 3 has two fixing points at its bottom, secured by bolts, a fixing plate 8, and washers. When installing the bolts at the bottom of the central counterweight 3, they will be obstructed by other parts of the excavator, making manual assistance in fixing the nuts impossible during assembly. The fixing plate 8 is a single unit welded from a steel plate and a nut. Before hoisting, glue the washers and fixing plate 8 to the counterweight mounting groove 16. The cross-section of the counterweight mounting groove 16 is as shown below. Figure 4 As shown. The adhesive is used to prevent the fixing plate 8 from moving during hoisting. After the counterweight 1 and the frame 14 are aligned, the worker tightens the bolts at the bottom of the frame 14. When tightening the bolts, the fixing plate 8 will be subjected to a torque and tend to rotate. At this time, due to the existence of the counterweight mounting groove 16, a torque in the opposite direction will be applied to the fixing plate 8, which can fix the nut and successfully complete the fixing of the middle counterweight 3.

[0035] The bottoms of the left counterweight 2 and the right counterweight 4 are fixed to the excavator frame 14 by bolts, nuts, and washers. Since there are no other parts obstructing the counterweight assembly, the nuts can be manually tightened. During assembly, one worker tightens the bolts at the bottom of the frame 14, while another worker uses a tool to apply a torque in the opposite direction to the nuts. Working together, the bottoms of the left counterweight 2 and the right counterweight 4 can be fixed and assembled.

[0036] like Figure 2 As shown, the counterweight 1 has an access port with tapped threads on its end face. The rear door 5 is bolted to the end face of the access port. The end face of the access port is equipped with a rear door shock absorber bracket 7 and a rear door lock plate 6. The rear door lock plate 6 engages with the rear door 5 to enable the opening and closing of the rear door 5. The rear door shock absorber bracket 7 provides shock absorption when the rear door 5 is opened and closed.

[0037] The counterweight 1 can be assembled with the frame to accommodate the side door 15. Threads are machined on the outer end faces of the left counterweight 2 and right counterweight 4 of the counterweight 1. The left counterweight 2 and right counterweight 4 are bolted to the side door shock absorber bracket 12, the side door lock plate 11, and the side door guide block bracket 10. The side door shock absorber bracket 12 can dampen the opening and closing of the side door 15, the side door lock plate 11 can assist the opening and closing of the side door 15, and the side door guide block bracket 10 can guide and dampen the opening and closing of the side door 15.

[0038] The present invention has been described in detail above. The above description is only a preferred embodiment of the present invention and should not be construed as limiting the scope of the present invention. All equivalent changes and modifications made in accordance with the scope of this application should still fall within the scope of the present invention.

Claims

1. A counterweight assembly structure for an excavator, comprising a frame (14) on which a counterweight (1) is mounted, characterized in that: The counterweight (1) is provided with an inspection port, and a groove (16) is provided in the middle of the counterweight (1). A fixing plate (8) is placed in the groove (16). The fixing plate (8) and the groove (16) are matched in a limiting manner. A nut (9) is fixed on the fixing plate (8). The fixing plate (8) and the bolt are used to fix the counterweight (1) on the frame (14).

2. The counterweight assembly structure for an excavator according to claim 1, characterized in that: The fixing plate (8) includes a limiting block (17), and a nut (9) is welded on the fixing plate (8). The limiting block (17) is embedded in the groove (16), and the groove (16) restricts the rotation of the fixing plate (8) through the limiting block (17).

3. The counterweight assembly structure for an excavator according to claim 2, characterized in that: The limiting block (17) is similar in shape to the groove, and there is a gap between the limiting block (17) and the groove (16).

4. The counterweight assembly structure for an excavator according to claim 1, characterized in that: The counterweight (1) includes a left counterweight (2), a middle counterweight (3) and a right counterweight (4), the bottoms of which are all fixed to the frame (14) by bolts.

5. The counterweight assembly structure for an excavator according to claim 4, characterized in that: The counterweight (1) is C-shaped.

6. The counterweight assembly structure for an excavator according to claim 5, characterized in that: The left counterweight body (2), the middle counterweight body (3) and the right counterweight body (4) are integrally formed.

7. The counterweight assembly structure for an excavator according to claim 1, characterized in that: The inspection port is provided with a rear door (5) and a rear door lock plate (6) on its end face; the rear door lock plate (6) is connected to the rear door (5).

8. The counterweight assembly structure for an excavator according to claim 7, characterized in that: The inspection port is provided with a rear door shock absorber bracket (7) on its end face. The rear door shock absorber bracket (7) is provided with shock absorber pads, which are connected to the rear door (5).

9. The counterweight assembly structure for an excavator according to claim 1, characterized in that: The counterweight (1) is equipped with an emergency stop switch (13).

10. The counterweight assembly structure for an excavator according to claim 1, characterized in that: The counterweight (1) is equipped with a side door (15), a side door shock absorber bracket (12), a side door lock plate (11), and a side door guide block bracket (10) on the left and right sides respectively. The rear door shock absorber bracket (7), the side door lock plate (11), and the side door guide block bracket (10) are connected to the side door (15).

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