一种伸缩式喷嘴旋喷钻具

Abstract

本实用新型公开了一种伸缩式喷嘴旋喷钻具，包括喷嘴主体，喷嘴主体一端设有刀头、另一端连接有芯管及外护筒；喷嘴主体两侧设有相对称的水平安装平台，安装平台上均设有第一沉孔与第二沉孔；第一沉孔内设有喷嘴组件，喷嘴组件为喷嘴、进水柱组成，进水柱上设有凸起圈，第一沉孔开口处设有端盖，端盖内设有第一中空内腔及第二中空内腔，第一中空内腔与进水柱滑动连接，端盖与凸起圈之间设有回复弹簧；第二沉孔内设有密封盖，密封盖与第二沉孔底部留有间隙形成进水腔。本实用新型喷嘴可以伸出，远离空气喷出区域，水流更加集中，切割效果更好。

Claims

1. A retractable nozzle rotary jet drill tool, comprising a nozzle body, one end of which is provided with a drill head, and the other end of which is connected with a core pipe and an outer sleeve; characterized in that, The nozzle body has symmetrical horizontal mounting platforms on both sides. Each mounting platform has a first countersunk hole and a second countersunk hole. The first and second countersunk holes on one side of the mounting platform are mirror-symmetrical to those on the other side of the mounting platform. A through hole is provided between the first countersunk hole and the second countersunk hole on the opposite side. A nozzle assembly is provided in the first countersunk hole. The nozzle assembly consists of a nozzle and a water inlet column. A raised ring is provided on the water inlet column. An end cap is provided at the opening of the first countersunk hole. The end cap has a first hollow inner cavity and a second hollow inner cavity. The first hollow inner cavity is slidably connected to the water inlet column. A return spring is provided between the end cap and the raised ring. A sealing cap is provided in the second countersunk hole. A gap is left between the sealing cap and the bottom of the second countersunk hole to form a water inlet cavity.

2. A retractable jet rotary jet drill tool according to claim 1, wherein, The diameter of the first hollow inner cavity is smaller than the diameter of the second hollow inner cavity. An air kit is provided inside the second hollow inner cavity, and the nozzle is slidably connected to the central channel of the air kit.

3. A retractable nozzle rotary jet drill according to claim 1, wherein, The end cap has a groove around its periphery, and the groove extends inward to form an air intake channel that connects with the second hollow inner cavity. The nozzle body has a main air intake channel that connects with the groove.

4. The retractable jet rotary jet drill tool of claim 1, wherein, One end of the water inlet column is slidably connected to the through hole. When the nozzle extends outward to the point where the water inlet column abuts against the air sleeve assembly, the sealing ring on the inner diameter surface of the through hole is always in contact with the inner end of the water inlet column.

5. A retractable nozzle rotary jet drill according to claim 1 wherein, The two sets of mirror-symmetrical water inlet chambers are connected by a water connection channel. The nozzle body is provided with a main water inlet channel that connects to the water inlet chamber on the side away from the cutter head.

6. A retractable jet rotary jet drill tool according to claim 1 wherein, The nozzle is surrounded by a protective sleeve, and the nozzle does not expose the plane where the opening of the protective sleeve is located when it is fully extended.

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