Structure and characteristics of single-cup hydraulic excavators

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This post was last edited by Yaotou2009 on 2011-7-25 at 16:12. Structure and characteristics of single-cylinder hydraulic excavators. The common working attachments for hydraulic excavators include front-shovel, back-shovel, loading, grab, and lifting attachments. Its basic structure and features are as follows: 1. Front shovel mechanism. The front shovel is the main type of general-purpose excavator, and it comes in two basic forms: a dedicated bucket type, which is used on hydraulic excavators with a bucket capacity of 1–2 m³ or more. The universal bucket type is often used with small and medium-sized backhoe hydraulic excavators; by installing the bucket in reverse, it becomes a front-loading device. A dedicated bucket-type backhoe unit consists of a boom, an arm, a bucket, as well as a boom cylinder, an arm cylinder, a bucket cylinder, and a linkage mechanism. Its structural feature is that all connections between the various components are achieved through hinges, with the extension and retraction of hydraulic cylinders being used to carry out various actions during excavation. The lower hinge point of the boom is connected to the rotating platform of the tracked base vehicle, and the boom cylinder is used to support the boom and adjust its tilt angle. As his cylinder extends and retracts, the boom rotates around the lower hinge point to rise and fall. The boom is articulated to the upper end of the arm, and its relative position to the arm is controlled by the boom cylinder; as the boom cylinder extends or retracts, the boom can rotate around the hinge point on the arm. The bucket is hinged at the front end of the boom, and the bucket rotates around this point as the bucket cylinder extends or retracts. To increase the rotation angle of the bucket, a linkage mechanism is usually used to connect it to the bucket. The backhoe is mainly used for excavating soil above the stop surface (the upper working surface) or ore after blasting, etc. Its excavating capacity depends on the movement of each cylinder and the way they work together. Once the structure and dimensions of the backhoe mechanism are determined (including the dimensions of the boom, arm, bucket, the positions of the hinges, the allowable relative angles, or the stroke of each cylinder), it is possible to use graphical methods to determine the envelope curve of the excavator’s trajectory. It reflects the working range that an excavator can control with any of its normal working attachments. The various control dimensions refer to the working dimensions of the front shovel unit in a hydraulic excavator; the main working dimensions of this unit are the maximum digging height and the maximum digging radius. When the backhoe unit is in operation, this is due to the hard soil and large working area. And limited by the digging direction and the overall stability of the machine, bucket cylinder operation is generally used for digging, with the boom cylinder sometimes also being used in conjunction. The bucket cylinder is primarily used to adjust the cutting angle and cutting depth, to clear obstacles, and to perform loading actions at the end of excavation in order to fill the bucket. To increase the unloading height and save unloading time, large and medium-sized excavators typically use a bottom-opening bucket design for unloading soil, with the opening and closing of the bucket bottom also being controlled by hydraulic cylinders. 2. Backhoe mechanism: The backhoe mechanism is the main working device of small and medium-sized hydraulic excavators. Currently, the bucket capacities widely used are below 1.6 m³. The composition and digging principle of the backhoe mechanism are similar to those of a fronthoe; the main difference lies in the opposite direction of digging, which in turn results in changes in the operating direction of the various cylinders. Furthermore, the backhoe device is mainly used to excavate soil below the surface where the machine will be stationed (such as in foundation pits and ditches). ) The maximum digging depth and maximum digging radius are the main operating dimensions of the backhoe unit. The backhoe units of hydraulic excavators use a rotating bucket for unloading soil, enabling accurate and smooth unloading that facilitates loading onto vehicles. 3. Loading device: The loading device of a hydraulic excavator is mainly used for loading soil, loose materials, and ores, etc. The unified loading device and the backhoe device are integrated with each other. The difference lies in the bucket section; since the resistance encountered during loading is less than that during digging, the capacity of the loading bucket can be increased, and its shape is more suitable for the requirements of loading operations. When the digging and loading device is in operation, the body remains stationary; it is the working components – the boom and bucket – that work together to scoop up the material, and the rotation mechanism is used to transport the material to the unloading location. This is different from ordinary wheel or track front-end loaders, which use the thrust generated as the machine moves forward to push the bucket into the material, and rely on the forward and backward movement of the entire machine to transport the material to the discharge location. Therefore, under certain conditions, the digging and loading device has a higher operational efficiency than a front-end loader, and it can also reduce wear on the traveling mechanism. The bucket capacity and operating range of excavator loaders are constrained by the machine’s stability and ground adhesion. Although their bucket capacity is smaller compared to front-end loaders of the same weight class, excavator loaders possess greater digging power. The ability to perform horizontal digging further enhances their functionality, and their operating range far exceeds that of front-end loaders; as a result, they are widely used in construction projects and mining operations. The above is all the information regarding the structure and features of single-cup hydraulic excavators. This article is shared by Construction Machinery Recruitment Network: http://www.gcjxjob.com