Low-stress special thread brace rod device and hydropress
A special thread and tie rod device technology, applied in the direction of presses, threaded fasteners, nuts, etc., can solve problems such as stress concentration in rounded corners, improve overall performance and service life, and reduce the effect of tie rod breakage
Active Publication Date: 2014-02-05
TAIYUAN HEAVY IND
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Problems solved by technology
[0005] The present invention solves the very serious technical problem of stress concentration at the rounded corners of the root of the rod thread of the existing hydraulic machine, and provides a low-stress special threaded rod device and hydraulic machine, which are used to eliminate the stress concentration phenomenon of the thread of the rod of the existing hydraulic machine , prolong the service life of the tie rod
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[0030] Typical embodiments embodying the features and advantages of the present invention will be described in detail in the following description. It should be understood that the invention is capable of various changes in different embodiments without departing from the scope of the invention, and that the description and accompanying drawings therein are illustrative in nature and not intended to be used. to limit the invention.
[0031] see figure 1 The shown low-stress special threaded rod device of the present invention includes a screw 1 and a nut 2. Both ends of the screw 1 have external threads, and the nut 2 with internal threads meshes with the external threads on the screw 1.
[0032] see figure 2 Shown is a schematic cross-sectional view of the external thread of the screw rod 1 of the present invention; image 3 Shown is a schematic cross-sectional view of the internal thread of the nut 2 of the present invention; Figure 4 Shown is a cross-sectional schemat...
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The invention discloses a low-stress special thread brace rod device and a hydropress. The thread brace rod device comprises a screw rod and a nut, wherein two end parts of the screw rod are provided with outer threads; the nut is engaged with the outer threads of the thread rod through inner threads; the outer threads and the inner threads have same original triangle and thread pitch; the vertex angle of the original triangle is between 55 DEG and 65 DEG; roots of the outer threads and the inner threads are respectively of a circular arc; and the radius of the circular arc of the root of each outer thread is larger than that of each inner thread. The low-stress special thread brace rod device disclosed by the invention eliminates the problem of high stress concentration of the traditional 45-DEG saw-tooth thread, has high bearing capability and high reliability, is capable of reducing brakeage of a brace rod to an extremely great extent and can be applied to various hydropresses with prestress combined rack structure, thereby promoting whole performance of the hydropresses and prolonging service lives of the hydropresses.
Description
technical field [0001] The invention relates to the technical field of hydraulic presses, and in particular to a low-stress special threaded tie rod device and a hydraulic press for a combined structure frame of a hydraulic press. Background technique [0002] The hydraulic press is the key equipment widely used in the metal pressure processing and manufacturing industry, and the round tie rod (also known as "tension column") is the most important part of the hydraulic press. During work, the tie rod bears the full tonnage axial tension, and is in a state of unidirectional alternating tensile stress with a large value for a long time; it bears the angular bending moment load acting on the inner fixing nut due to the deformation of the upper and lower beams; at the same time, the tie rod also As the guide body of the movable beam, it bears the lateral thrust and bending moment of the movable beam during eccentric forging. Therefore, the tie rod becomes the most vulnerable pa...
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IPC IPC(8): F16B33/04B30B15/00
Inventor 郭玉玺毛春燕
Owner TAIYUAN HEAVY IND