Portal frame

About: Portal frame is a research topic. Over the lifetime, 1778 publications have been published within this topic receiving 7210 citations.

Production line and production method of steel channel used for large-scale forklift portal frame

Abstract: The invention discloses a production line and production method of a steel channel used for a large-scale forklift portal frame. The production line comprises a reversible roughing mill and an all-powerful finishing mill group arranged behind the reversible roughing mill, the all-powerful finishing mill group comprises an all-powerful finishing mill U1, an all-powerful finishing mill U2 and an edging mill E1 which are all arranged in sequence of the U1, the E1 and the U2; each edging mill of the all-powerful finishing mill group utilizes a two side roll gap value, rolling reduction and hole patterns with different extend rates; the production method comprises the steps that step 1, a blank is rolled by the use of the reversible roughing mill to roll an eudipleural rolling piece for the need of being put in the finishing mill group; step 2, the rolling mill of the U1, the E1 and the U2 are used for rolling the eudipleural rolling piece which is obtained in the step 1 to obtain the steel channel used for the large-scale forklift portal frame. According to the large-scale forklift portal frame produced in the method, the rigidity of the portal frame is improved under the condition of guaranteeing the use performance, the processing efficiency is improved, and the manufacturing cost of the forklift portal frame is lowered.

Automatic glass edging machining center who changes

Abstract: The utility model provides an automatic glass edging machining center who changes, includes the frame, is equipped with the workstation of fixed work piece in the frame, and it is equipped with the portal frame to slide in the frame of workstation top, and the portal frame both sides are passed through the slide and are sat and establish on the guide rail of frame both sides, install the slide on the portal frame, install main shaft mechanism on the slide, characterized by, main shaft mechanism installs scanner and infrared emitter. This automatic glass edging machining center, can be rapidly the scanning size of shining upon a work piece accurately, do not need any measuring tool to go on improving processing production efficiency greatly to the measuring of work piece size, improve this market competitiveness of the product.

Device for changing bending tools

Abstract: A grasping device for changing bending tools on tube bending machines which includes a frame mounted over the bending machine. The grasping device includes a rotary head having independent movements in rotation, vertical motion and horizontal motion. A tool magazine is also movably carried by the portal frame independently of the rotary head.

Effect of differential settlement on frame forces - a parametric study

Abstract: The dynamic nature of loads, seasonal variation of soil properties, uneven soil strata below footings or inappropriate design of foundation makes differential settlement inevitable. Differential settlement is largely responsible for developing forces or changing the existing forces in the structure and is often considered as the underlying cause of many structural failures. A structural engineer has to take into account these forces while designing the structure. Different structural parameters like stiffness of columns and beams and number of storeys and bays affect the response of the structure to differential settlement. In the present study, a plain portal frame subjected to constant differential settlement of 10 mm is analyzed for different cases using a structural analysis software i.e. STAAD Pro. Different parameters of the frame are varied to understand their influence on frame forces developed due to differential settlement. The parameters taken into account in this study are length of beam, height of column, moment of inertia of beam and column and number of storeys and bays. It is found that the forces in the frame developed due to differential settlement decrease on increasing beam lengths and column heights. Also, decreasing the moment of inertia of beams and columns is effective in reducing these forces. In addition, differential settlement tends to affect forces more in lower storeys as compared to higher storeys. The frame forces are more prominent for bays which are near to the support subjected to settlement. The increase or decrease in frame forces due to differential settlement can be attributed to the change in stiffness of the members. Hence, the study concludes that the stiffer members tend to develop higher forces for constant differential settlement in frames.