Double-shoulder self-sealing drilling and boring rod structure for deep hole drill

Abstract

The utility model relates to a double-shoulder self-sealing drilling and boring rod structure for a deep hole drill, which comprises a hollow rod body, a double-end double-shoulder external thread and a double-end double-shoulder internal thread, and the double-end double-shoulder external thread and the double-end double-shoulder internal thread are processed at two ends of the hollow rod body; the thread form is a rectangular square thread, the inner and outer thread ends adopt double shoulders, and an inner and outer thread small end sealing angle and an inner and outer thread large end sealing angle with 13-angle sealing surfaces are machined at the inner and outer thread small end and the inner and outer thread large end; the double-end double-shoulder external thread of one drilling and boring rod is screwed into the double-end double-shoulder internal thread of the other drilling and boring rod, and the whole drilling and boring rod is formed by end-to-end connection after tightening and screwing; the 13-degree sealing surfaces of the large end and the small end of the thread are attached to form an angle self-sealing surface; the rectangular threads of the drilling and boring rod transmit torque, the double-shoulder structure of the threads positions and enhances the strength of the threaded connector, the structure is simple, large torque can be transmitted, two shoulder faces can be sealed at the same time after screwing, and the problem of leakage of cooling liquid is solved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the field of deep hole drilling mechanical processing, especially relates to a double shoulder self-sealing drill boring bar structure for deep hole drilling. BACKGROUND

[0002] In the field of deep hole drilling, the rotation of the drill bit needs to be driven by the hollow drill rod during drilling, and the drill rod needs to bear a large torque; the cooling liquid needs to be injected through the inner hole of the drill rod to cool the drill bit and flush the iron filings, and the drill rod and the drill rod connection need to be sealed without leakage.

[0003] Under normal circumstances, the drill rod connection adopts trapezoidal thread or sawtooth thread connection, and the drill rod and the drill rod connection adopt the method of sealing with gaskets. New gaskets need to be prepared every time the drill rod is disassembled, and special tools are needed when the drill boring rod connection thread is repaired, which requires high processing precision and is not convenient for measuring the connection thread. Therefore, it is necessary to design a simple and universal drill boring rod with self-sealing function. UTILITY MODEL CONTENT

[0004] The utility model aims at overcoming the deficiencies in the prior art and providing a double shoulder self-sealing drill boring bar structure for deep hole drilling which is simple, universal and has a self-sealing function.

[0005] The technical scheme of the utility model is as follows: a double shoulder self-sealing drill boring bar structure for deep hole drilling, comprising a hollow rod body, double-head double-shoulder external threads on the hollow rod body, and double-head double-shoulder internal threads, wherein the hollow rod body is a quenched and tempered alloy steel pipe with a polished outer surface, double-head double-shoulder external threads and double-head double-shoulder internal threads are machined at both ends of the alloy steel pipe respectively;

[0006] The thread form of the double-head double-shoulder internal threads is rectangular square thread, the lead is 12mm, the pitch is 6mm, the internal thread end adopts a double-shoulder form, and an internal thread small end sealing angle and an internal thread large end sealing angle are machined at the small end and the large end of the internal thread respectively, and the angles of the two sealing surfaces are both 13º;

[0007] The thread form of the double-head double-shoulder external threads is rectangular square thread, the lead is 12mm, the pitch is 6mm, the external thread end adopts a double-shoulder form, and an external thread small end sealing angle and an external thread large end sealing angle are machined at the small end and the large end of the external thread respectively, and the angles of the two sealing surfaces are both 13º;

[0008] When screwing, the double-head double-shoulder external thread of one drill rod is screwed into the double-head double-shoulder internal thread of another drill rod, the number of the screwed drill rods is determined according to the length of the drilled and bored workpiece, and the screwed drill rods are connected end to end to form a whole drill rod after being tightened; the gap between the length of the double-head double-shoulder external thread and the double-head double-shoulder internal thread is 0.1-0.2mm, the 13° sealing surfaces of the large end and the small end of the thread are slightly deformed after being attached to each other, and the angle self-sealing surface is formed; the rectangular thread of the drill rod is a rectangular thread connection structure for transmitting torque, and the double-shoulder structure of the thread is a connection sealing structure for positioning and enhancing the strength of the thread joint.

[0009] The deviation of the total length of the internal thread end is +0.2 / +0.1mm.

[0010] The deviation of the total length of the external thread end is +0.1 / 0mm.

[0011] The positive effects of the technical scheme of the utility model are as follows: rectangular thread connection is adopted, and large torque can be transmitted. Two shoulder surfaces can be sealed at the same time after screwing, and the problem of cooling liquid leakage is solved. The thread adopts a double-shoulder structure, which is convenient for screwing positioning and enhancing the strength of the thread. The double-head thread design is convenient for replacing the upper and lower buckles. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 It is a sectional view of the structure of the utility model.

[0013] Figure 2 It is an enlarged schematic view of the double-head double-shoulder internal thread of the utility model,

[0014] Figure 3 It is a sectional view of the double-head double-shoulder external thread of the utility model.

[0015] In the above 3 figures, the following are marked: 1-internal thread large end sealing angle; 2-internal thread small end sealing angle; 3-internal thread stop length; 4-internal thread tool withdrawal length; 5-internal thread end total length; 6-external thread large end sealing angle; 7-external thread small end sealing angle; 8-external thread stop length; 9-external thread tool withdrawal length; 10-external thread end total length; 11-single drill rod total length; 12-pitch of connecting thread; 13-pitch of connecting thread; 14-tooth height of connecting thread; 15-milling depth of external thread tool withdrawal port. DETAILED DESCRIPTION

[0016] For example, Figure 1 , 2As shown in Figure 3, a double-shoulder self-sealing drill boring bar structure for deep hole drilling includes a hollow rod body, a double-headed double-shoulder external thread and a double-headed double-shoulder internal thread located on the hollow rod body. The hollow rod body is an alloy steel pipe with a polished outer surface after heat treatment. The double-headed double-shoulder external thread and the double-headed double-shoulder internal thread are respectively machined at both ends of the hollow rod body.

[0017] The double-headed, double-shoulder internal thread has a rectangular square thread profile. The lead 12 of the connecting thread is 12mm, the pitch 13 of the connecting thread is 6mm, and 14 is the thread height of the connecting thread. The internal thread end adopts a double-shoulder form, and angle sealing surfaces are machined at both the small end and the large end of the internal thread. The sealing surface angle is 13º, which becomes the sealing angle 2 at the small end of the internal thread and the sealing angle 1 at the large end of the internal thread. In the figure, 3 is the length of the internal thread stop; 4 is the length of the internal thread retraction; and the deviation of the total length 5 of the internal thread end is +0.2 / +0.1mm.

[0018] The thread profile of the double-headed, double-shoulder external thread is a rectangular square thread. The lead 12 of the connecting thread is 12mm, and the pitch 13 of the connecting thread is 6mm. The external thread end adopts a double-shoulder form. At the same time, angle sealing surfaces are machined at both the small end and the large end of the external thread. The degree of the sealing surface is 13º, which becomes the sealing angle 7 at the small end of the external thread and the sealing angle 6 at the large end of the external thread. 8 is the length of the external thread stop; 9 is the external thread retraction length; and the deviation of the total length 10 of the external thread end is +0.1 / 0 mm.

[0019] In use, clamp the outer diameter of the pipe with chain clamps and screw the external thread of one drilling and boring bar (i.e., the total length of a single drilling and boring bar is 11) into the internal thread of another drilling and boring bar. The number of drilling and boring bars to be engaged is determined according to the length of the workpiece being drilled. After tightening, the bars are connected end to end to form a complete drilling and boring bar. After engagement, the gap between the external and internal threads is 0.1 to 0.2 mm. The 13° sealing surfaces at the large and small ends of the threads come into contact with each other and undergo slight deformation to form a self-sealing surface to prevent coolant leakage. The rectangular thread of the drilling and boring bar is used to transmit torque, and the double-shoulder structure of the thread is used to position and enhance the strength of the threaded joint.

[0020] 15 represents the retraction depth of the external thread.

Claims

1. A double-shoulder self-sealing drill boring bar structure for deep hole drilling, comprising a hollow bar body, a double-headed double-shoulder external thread located on the hollow bar body, and a double-headed double-shoulder internal thread, characterized in that: The hollow rod body is an alloy steel tube with a polished outer surface after quenching and tempering heat treatment. Double-headed double-shoulder external threads and double-headed double-shoulder internal threads are machined at both ends of the alloy steel tube. The thread profile of the double-headed double-shoulder internal thread is a rectangular square thread with a lead of 12mm and a pitch of 6mm. The internal thread end adopts a double-shoulder form. At the same time, the sealing angle of the small end of the internal thread (2) and the sealing angle of the large end of the internal thread (1) are machined with a sealing surface of 13º angle at both the small end and the large end of the internal thread. The thread profile of the double-headed double-shoulder external thread is a rectangular square thread with a lead of 12mm and a pitch of 6mm. The external thread end adopts a double-shoulder form. At the same time, the small end sealing angle (7) and the large end sealing angle (6) of the external thread are machined with a 13º angle sealing surface at both the small end and the large end. During engagement, the double-ended, double-shoulder external thread of one drill boring bar is screwed into the double-ended, double-shoulder internal thread of another drill boring bar. The number of drill boring bars to be engaged is determined according to the length of the deep hole workpiece being drilled. After tightening, the bars are connected end to end to form a complete drill boring bar. The gap between the double-ended, double-shoulder external thread and the double-ended, double-shoulder internal thread is 0.1 to 0.2 mm. The 13° sealing surfaces at the large and small ends of the threads come into contact with each other and undergo slight deformation, forming an angled self-sealing surface. The rectangular thread of the drill boring bar is a rectangular thread connection structure for transmitting torque, and the double-shoulder structure of the thread is a connection and sealing structure for positioning and enhancing the strength of the threaded joint.

2. The double-shoulder self-sealing drill boring bar structure for deep hole drilling according to claim 1, characterized in that: The deviation of the total length (5) of the internal thread end is +0.2 / +0.1mm.

3. The double-shoulder self-sealing drill boring bar structure for deep hole drilling according to claim 1, characterized in that: The deviation of the total length (10) of the external thread end is +0.1 / 0 mm.

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