Hydraulic joint used for clamping test piece with superfine pipe diameter

[0019] see figure 1 , The present invention is a hydraulic joint for clamping a micro-pipe diameter test piece, which includes: an improved pipeline pressure inlet joint part, a sealing clamping part, an improved pipeline pressure outlet joint part, and the positional connection relationship between them is : The improved pipeline pressure inlet joint part is located at the left end of the sealing clamping part, and the two are connected by threads; the improved pipeline pressure outlet joint part is located at the right end of the sealing clamping part, and the two are connected by threads.

[0020] The improved pipeline pressure inlet joint part includes two parts: a hydraulic pipe 1 and a hydraulic pipe nut 2 at the left end, which are sleeved; this part is located on the left side of the joint body 7, and the hydraulic pipe nut 2 can optionally be matched with a standard part of the joint body The standard nut, which can rotate freely relative to the hydraulic pipe 1, is connected with the joint body 7 through threads. When the hydraulic pipe nut 2 and the joint body 7 are fastened by threads, the hydraulic pipe 1 is squeezed so that the hydraulic pipe 1 is relative to The position of the joint body 7 is fixed.

[0021] The sealing clamping part is located in the reworked cavity inside the joint main body 7, and consists of a sealing ring 3, a special-shaped gasket 4, two rubber gaskets 5, two PTFE gaskets 6, and the joint main body 7. The components are connected to each other in the internal cavity of the joint body 7 in sequence. . The joint body 7 can be manufactured by standard parts. A stepped hole with an inner diameter of 8mm is machined on the basis of the standard parts. The part on the right side where the shaft end plug 8 needs to be inserted is reamed with a 1:16 taper reamer. In order to ensure that the rubber gasket 5 bears a certain axial pressure when working, the lower diameter of the special-shaped gasket 4 must be larger than the diameter of the reworked cavity of the joint body 7, so that when the hydraulic pipe 1 is squeezed by the hydraulic pipe nut 2, it can be directly The special-shaped gasket 4 contacts, and the rubber gasket 5 in the cavity is further squeezed by the special-shaped gasket 4 to achieve a sealing effect; at the same time, in order to ensure the sealing performance of the joint, no oil leakage due to excessive pressure is caused in the hydraulic pipe 1. The sealing ring 3 is added to the connection part of the special-shaped gasket 4 inside the joint body 7.

[0022] The improved pipeline pressure outlet joint part is located at the right end of the joint body 7, and is composed of a shaft end plug 8 and a fastening nut 9, which are sleeved. The shaft slug 8 is made of brass. On the basis of a cylindrical piece, it is matched with the taper hole at the right end of the joint body 7 to process a 1:16 taper. The middle hole is opened to facilitate the clamping of the test piece 10 through it. When the compression force of the shaft end plug 8 is reduced, the inner diameter of the shaft end plug 8 is reduced, and the test piece 10 is held tightly, and the test piece 10 is tightened; the tightening nut 9 can be a standard part nut that matches the standard part of the joint body 7. When the joint body 7 is screwed and fastened, the shaft end plug 8 is squeezed inwardly. Due to the taper, the shaft end plug 8 receives a radial force, thereby achieving the purpose of holding the test piece 10 tightly.