Multi-functional boom cylinder for excavator

Abstract

The utility model discloses a multifunctional movable arm oil cylinder for excavator, including fixed seat, one side of the lower extreme of fixed seat is connected with the hydraulic cylinder body of rotation, one end of hydraulic cylinder body is connected with piston rod, and one end of piston rod is welded with connecting piece, the both sides of connecting piece all are fixed with reinforcing plate, and one side screw joint of reinforcing plate has fastening screw, one end screw joint of piston rod has connecting ring, and the both sides of connecting ring all are equipped with blind hole, and one end of one fastening screw of same side extends to one blind hole of same side, the utility model discloses through welding and reinforcing connection form double -insurance reinforcement, even if thread failure under extreme working condition, the connection of welding place can still maintain structural integrity, restrain the bending moment deformation and shearing stress of horizontal vibration, promote the intensity and firmness of connecting place, and the practicality has been strengthened.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic cylinder technology for excavator booms, and in particular to a multi-functional hydraulic cylinder for excavators. Background Technology

[0002] The multi-functional boom of an excavator is the core of the excavator's working device. Its main function is to control the bucket to complete digging, loading and other actions. The boom is controlled by hydraulic cylinders to lift and lower. The multi-functional boom supports quick change of attachments, such as hydraulic breakers, augers, hydraulic thumb clamps, etc. It can also integrate boom swing function to enhance the lateral working range.

[0003] Traditional excavator boom cylinders face stress concentration failure under high-frequency impact conditions. The welded area between the piston rod and the connecting parts is prone to fatigue cracks under alternating loads, and crack propagation leads to structural fracture. To address these issues, we propose a multi-functional boom cylinder for excavators. Utility Model Content

[0004] The purpose of this utility model is to address the shortcomings of existing technologies by proposing a multi-functional boom cylinder for excavators.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A multi-functional boom cylinder for excavators includes a fixed base, a hydraulic cylinder body rotatably connected to one side of the lower end of the fixed base, a piston rod connected to one end of the hydraulic cylinder body, and a connecting piece welded to one end of the piston rod. Both sides of the connector are fixed with reinforcing plates, and one side of the reinforcing plate is threaded with a fastening screw. One end of the piston rod is threaded with a connecting ring, and both sides of the connecting ring are provided with blind holes; One end of a fastening screw on the same side extends into a blind hole on the same side.

[0006] Preferably, one end of the piston rod is provided with multiple external threads at equal intervals, and the middle part of the connecting ring is provided with a threaded through hole, which is screwed onto the external threads.

[0007] Preferably, the reinforcing plate has a threaded limiting hole on one side, and a fastening screw on the same side is threaded into the threaded limiting hole on the same side.

[0008] Preferably, a connecting seat is provided through the connector, and the connecting seat and the connector are connected by a connecting shaft.

[0009] Preferably, a mounting component is fixed to one side of the lower end of the fixed base, and one end of the hydraulic cylinder body is rotatably connected to the mounting component.

[0010] Preferably, the reinforcing plate and the connector are fitted with rubber sleeves.

[0011] This utility model has the following advantages: 1. The fastening screws and blind holes form a mechanical lock to prevent loosening. The welding and reinforcement connection form a double insurance reinforcement. Even if the threads fail under extreme working conditions, the welded connection can still maintain the structural integrity. 2. By forming a rigid frame with reinforcing plates and connectors, the bending moment deformation caused by lateral vibration is suppressed. At the same time, the fastening screws form a mechanical limit, directly sharing more than 30% of the shear stress at the welding point, thereby improving the strength and firmness of the connection. 3. Worn screws can be re-tapping to repair them and extend their service life; In summary, this utility model provides double reinforcement through welding and strengthening connections. Even if the threads fail under extreme working conditions, the welded connection can still maintain structural integrity, suppress bending moment deformation and shear stress caused by lateral vibration, improve the strength and firmness of the connection, and enhance its practicality. Attached Figure Description

[0012] Figure 1 This is a structural diagram of the present invention; Figure 2 A structural diagram showing the fastening screw of this utility model; Figure 3 This is a structural diagram of the rubber sleeve of this utility model; Figure 4 This is a structural diagram of the connecting ring of this utility model.

[0013] In the diagram: 101 Fixed seat, 102 Mounting part, 201 Hydraulic cylinder body, 202 Piston rod, 203 External thread, 204 Connecting ring, 205 Blind hole, 206 Threaded through hole, 301 Connecting seat, 302 Connecting part, 303 Connecting shaft, 401 Reinforcing plate, 402 Fastening screw, 403 Threaded limit hole, 501 Rubber sleeve. Detailed Implementation

[0014] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0015] Reference Figure 1-4 A multi-functional boom cylinder for excavators includes a fixed base 101, which serves as the base for the cylinder and is used to install the entire cylinder assembly onto the root structure of the excavator boom. It has high-strength bolt mounting holes to ensure a rigid and reliable connection with the host structure and to withstand the huge reaction force and vibration load during excavation operations. A hydraulic cylinder body 201 is rotatably connected to one side of the lower end of the fixed base 101. A piston rod 202 is connected to one end of the hydraulic cylinder body 201. A connecting piece 302 is welded to one end of the piston rod 202. The piston rod 202 moves axially under the action of hydraulic oil, directly outputting push / pull force to drive the excavator bucket or stick. The surface is treated with hard chrome plating, which has extremely high hardness, smoothness and wear resistance, and can resist external impact, wear and corrosion, and extend service life. Both sides of the connector 302 are fixed with reinforcing plates 401. One side of the reinforcing plate 401 is threaded with a fastening screw 402. The reinforcing plate 401 enhances the rigidity and strength of the welding area between the connector 302 and the piston rod 202. It is made of high-strength steel plate, symmetrically arranged on both sides of the connector 302, and firmly welded to the connector 302. Together with the connector 302, they form a rigid frame structure. One end of the piston rod 202 is threaded with a connecting ring 204. Both sides of the connecting ring 204 are provided with blind holes 205. One end of a fastening screw 402 on the same side extends into a blind hole 205 on the same side. The end of the fastening screw 402 is embedded in the blind hole 205 to form a precise mechanical limit. This not only prevents the connecting ring 204 from accidentally loosening and rotating during use, but also allows the stress to be directly transferred to the reinforcing plate 401 and the connecting ring 204 through the fastening screw 402 when the weld point is subjected to huge shear stress, such as the strong digging of the excavator bucket or the side impact. This significantly reduces the shear stress originally borne by the weld point. The piston rod 202 has multiple external threads 203 at equal intervals at one end, and the connecting ring 204 has a threaded through hole 206 in the middle, which is screwed onto the external threads 203. A threaded limiting hole 403 is provided on one side of the reinforcing plate 401. A fastening screw 402 on the same side is threaded into the threaded limiting hole 403 on the same side. After the fastening screw 402 is tightened, its end presses against the bottom of the blind hole 205, which tightens the reinforcing plate 401, the connecting piece 302 and the connecting ring 204 into a tighter whole. This forms a direct and rigid reinforcement support for the end of the piston rod 202 and the welding area of ​​the connecting piece 302 below, effectively suppressing the lateral vibration and bending deformation that are prone to occur when the piston rod 202 extends for a long time or under lateral load, and improving the stability and accuracy of the cylinder action. A connecting seat 301 is provided through the connector 302. The connecting seat 301 and the connector 302 are connected by a connecting shaft 303. An installation part 102 is fixed on one side of the lower end of the fixed seat 101. One end of the hydraulic cylinder body 201 is rotatably connected to the installation part 102. A rubber sleeve 501 is fitted on the reinforcing plate 401 and the connector 302. The rubber sleeve 501 is dustproof, waterproof, and corrosion-resistant, and protects the internal threaded connection.

[0016] In this utility model, during installation, the fixed seat 101 and the connecting seat 301 are connected. High-pressure oil enters the hydraulic cylinder body 201 and pushes the piston rod 202 to move axially. The reinforcing plates 401 on both sides and the connecting parts 302 form a rigid frame to suppress bending moment deformation caused by lateral vibration. The fastening screws 402 further reinforce and protect the welded joint of the piston rod 202 and the connecting parts 302. The end of the fastening screws 402 is embedded in the blind hole 205 to form a mechanical limit, directly sharing more than 30% of the shear stress of the welded joint.

[0017] The above are merely preferred embodiments of this utility model, but the scope of protection of this utility model is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in this utility model, based on the technical solution and inventive concept of this utility model, should be included within the scope of protection of this utility model.

Claims

1. A multi-functional boom cylinder for an excavator, comprising a fixed base (101), characterized in that, A hydraulic cylinder body (201) is rotatably connected to one side of the lower end of the fixed base (101). A piston rod (202) is connected to one end of the hydraulic cylinder body (201), and a connector (302) is welded to one end of the piston rod (202). Both sides of the connector (302) are fixed with reinforcing plates (401), and one side of the reinforcing plate (401) is threaded with a fastening screw (402). One end of the piston rod (202) is threaded with a connecting ring (204), and both sides of the connecting ring (204) are provided with blind holes (205). One end of a fastening screw (402) on the same side extends into a blind hole (205) on the same side.

2. The multi-functional boom cylinder for excavators according to claim 1, characterized in that: The piston rod (202) has multiple external threads (203) at equal intervals at one end, and the connecting ring (204) has a threaded through hole (206) in the middle, and the threaded through hole (206) is screwed onto the external threads (203).

3. A multi-functional boom cylinder for excavators according to claim 1, characterized in that: The reinforcing plate (401) has a threaded limiting hole (403) on one side, and a fastening screw (402) on the same side is threaded into the threaded limiting hole (403) on the same side.

4. A multi-functional boom cylinder for excavators according to claim 1, characterized in that: The connector (302) is provided with a connecting seat (301) through it, and the connecting seat (301) and the connector (302) are connected by a connecting shaft (303).

5. A multi-functional boom cylinder for excavators according to claim 1, characterized in that: A mounting component (102) is fixed to one side of the lower end of the fixed base (101), and one end of the hydraulic cylinder body (201) is rotatably connected to the mounting component (102).

6. A multi-functional boom cylinder for excavators according to claim 1, characterized in that: Rubber sleeves (501) are fitted onto the reinforcing plate (401) and the connector (302).

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