The screw shaft unit used in the screw connection assembly needs to be horizontally moved to align with the nuts of the multi-channel valve body that has been initially assembled. The sleeve on the corresponding single tightening shaft needs to be concentric with the nut to be tightened on the multi way valve on the auxiliary assembly platform, so that the next tightening process can be carried out. The multi way valves that have been preliminarily assembled are arranged on the bearing platform according to 2 * 5, and the tightening box needs to be moved to meet the assembly position of each multi way valve that the tightening box can reach.<br>Horizontal movement mainly refers to that the tightening box can realize any movement in the plane parallel to the ground through the guide rail slider installed on the supporting parts, mainly including forward and backward movement and left and right movement. The multi-way valve pre assembled lifting platform is in the support frame. Considering that the tightening box can reach each multi-way valve position and ensure that the operator has enough operation space, the design front and back travel is 1360mm, and the left and right travel is 1660mm.<br>b. Vertical movement<br>The vertical movement needs to be limited due to the influence of the multi way valve's shape height, and the whole tightening box has a certain weight, so the load should be considered in the design, so the pneumatic lifting device is adopted. The air cylinder is fixed on a bracket composed of 40 * 40 aluminum profiles, and the piston rod of the air cylinder is connected with the tightening box. The up and down movement of the tightening unit is to provide enough space for the preliminary assembly of multiple valve bodies, so that the operators can easily install each combined valve body. In order to ensure the smooth operation of the tightening unit, the straight-line guide rail is used between the tightening box body and the supporting parts, which acts together with the air cylinder to complete the smooth operation of the screw connection assembly and the tightening shaft<br>
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