Shaft body anti-falling mechanism for transmission shaft of screw drill

Abstract

The invention belongs to the technical field of petroleum drilling equipment, and particularly relates to a screw drill transmission shaft assembly anti-falling mechanism which comprises a transmission shaft, a lower TC bearing movable sleeve, a lower TC bearing static sleeve, an anti-falling ball, a spacer bush, a semi-ring pressure-bearing sleeve, a thrust bearing set, a transmission shaft shell, an upper TC bearing static sleeve and an upper TC bearing movable sleeve. The lower TC bearing movable sleeve is connected with the transmission shaft through threads, and the transmission shaft shell is connected with the lower TC bearing static sleeve through threads; the upper end of the lower TC bearing movable sleeve is provided with six positioning grooves for the anti-falling balls, the anti-falling balls are arranged between the lower TC bearing movable sleeve and the spacer bush and matched with the positioning grooves, the semi-ring is connected with the upper end of the lower TC bearing movable sleeve, and the pressure-bearing sleeve is pressed on one side of the semi-ring and arranged on the transmission shaft in a sleeving mode. According to the device, the lower TC bearing movable sleeve is connected with the lower TC bearing through the six anti-falling balls, and the lower TC bearing is connected with the lower part of the transmission shaft through the threads, so that the failure part does not fall off, and the underground safety is ensured.

Description

Technical Field

[0001] The invention belongs to the technical field of petroleum drilling equipment, and in particular relates to a mechanism for preventing a shaft body of a screw drill transmission shaft from falling off. Background Art

[0002] In oil and gas drilling, screw drill tools are mainly used to drill special process wells, and can also be used to drill vertical wells. With the development of oil and gas exploration and development, drilling technology is constantly developing, which has promoted the continuous progress and improvement of screw drill tools. Looking at its development process and development trend, its direction can be basically summarized as: long life, high torque, high speed, and multi-function. At present, the purpose of the screw drill tools used in oil and natural gas drilling projects is to transmit the power of the motor to the drill bit, and the life of the drive shaft assembly determines the life of the screw drill tool. The motor transmits power to the drive shaft through the universal shaft. The drive shaft assembly not only bears the drilling pressure during drilling, but also transmits torque and speed. The drive shaft assembly has many parts. After working underground for a long time, the drive shaft assembly will fail, causing underground accidents. The drive shaft breaks from the lower bearing and often falls into the well due to the failure of the lower anti-drop. Summary of the invention

[0003] The purpose of the present invention is to provide a screw drill transmission shaft anti-drop mechanism to solve the problems existing in the prior art.

[0004] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a screw drill transmission shaft assembly anti-drop mechanism, comprising a transmission shaft, a lower TC bearing moving sleeve, a lower TC bearing static sleeve, an anti-drop ball, a spacer, a semi-ring pressure sleeve, a thrust bearing group, a transmission shaft housing, an upper TC bearing static sleeve and an upper TC bearing moving sleeve; the lower TC bearing moving sleeve and the transmission shaft are connected together by threads, the transmission shaft housing and the lower TC bearing static sleeve are connected by threads, the thrust bearing group is installed between the transmission shaft housing and the transmission shaft, the upper TC bearing static sleeve is installed between the transmission shaft housing and the thrust bearing group, and the upper TC bearing moving sleeve is threadedly connected to the transmission shaft; the upper end of the lower TC bearing moving sleeve is provided with six anti-drop ball positioning grooves, the anti-drop ball is placed between the lower TC bearing moving sleeve and the spacer and cooperates with the positioning grooves, the semi-ring is connected to the upper end of the lower TC bearing moving sleeve, and the pressure sleeve is pressed on one side of the semi-ring and sleeved on the transmission shaft.

[0005] Preferably, the cross section of the positioning groove is hemispherical.

[0006] The beneficial effect of the present invention is that the lower TC bearing moving sleeve in the device connects the lower TC bearing through 6 anti-drop balls, and the lower TC bearing connects the lower part of the transmission shaft through threads, so that the failed part does not fall off, ensuring underground safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 It is a front view of the present invention;

[0008] Figure 2 is a cross-sectional view of the movable sleeve of the lower TC bearing in the present invention;

[0009] Figure 3 It is an enlarged view of the anti-drop part in the present invention;

[0010] In the figure: 1. transmission shaft, 2. lower TC bearing moving sleeve, 3. lower TC bearing static sleeve, 4. anti-drop ball, 5. half ring, 6. pressure sleeve, 7. spacer sleeve, 8. transmission shaft housing, 9. thrust bearing group, 10 upper TC bearing static sleeve, 11. upper TC bearing moving sleeve. DETAILED DESCRIPTION

[0011] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0012] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0013] In the description of the invention, it should be noted that, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fixed connection" and "fixed connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the invention can be understood according to specific circumstances.

[0014] The specific implementation of the present invention is described in detail below with reference to the accompanying drawings and preferred embodiments.

[0015] like Figure 1As shown, a screw drill transmission shaft assembly anti-drop mechanism includes a transmission shaft 1, a lower TC bearing moving sleeve 2, a lower TC bearing static sleeve 3, an anti-drop ball 4, a half ring 5, a pressure sleeve 6, a spacer sleeve 7, a transmission shaft housing 8, a thrust bearing group 9, an upper TC bearing static sleeve 10 and an upper TC bearing moving sleeve 11.

[0016] The lower TC bearing moving sleeve 2 and the transmission shaft 1 are connected together by threads, the transmission shaft housing 8 and the lower TC bearing static sleeve 3 are connected by threads, the thrust bearing group 9 is installed between the transmission shaft housing 8 and the transmission shaft 1, the upper TC bearing static sleeve 10 is installed between the transmission shaft housing 8 and the thrust bearing group 9, and the upper TC bearing moving sleeve 11 is threadedly connected to the transmission shaft 1.

[0017] As an improvement of the present invention, the upper end of the lower TC bearing moving sleeve 2 is provided with six anti-drop ball positioning grooves 12, and the cross section of the positioning groove is hemispherical. The anti-drop ball 4 is placed between the lower TC bearing moving sleeve 2 and the spacer sleeve 7 and cooperates with the positioning groove, the semi-ring 5 is connected to the upper end of the lower TC bearing moving sleeve, and the pressure sleeve 6 is pressed on one side of the semi-ring and sleeved on the transmission shaft. The lower TC bearing moving sleeve is connected to the lower TC bearing through the six anti-drop balls, and the lower TC bearing is connected to the lower part of the transmission shaft through the thread, so that the failed part does not fall off, ensuring the safety of the well.

[0018] It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention, and these improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A screw drill transmission shaft anti-drop mechanism, characterized in that: It includes a transmission shaft, a lower TC bearing moving sleeve, a lower TC bearing static sleeve, an anti-drop ball, a spacer, a half-ring pressure sleeve, a thrust bearing group, a transmission shaft housing, an upper TC bearing static sleeve and an upper TC bearing moving sleeve; the lower TC bearing moving sleeve and the transmission shaft are connected together by threads, the transmission shaft housing and the lower TC bearing static sleeve are connected by threads, the thrust bearing group is installed between the transmission shaft housing and the transmission shaft, the upper TC bearing static sleeve is installed between the transmission shaft housing and the thrust bearing group, and the upper TC bearing moving sleeve is threadedly connected to the transmission shaft; the upper end of the lower TC bearing moving sleeve is provided with six anti-drop ball positioning grooves, the anti-drop ball is placed between the lower TC bearing moving sleeve and the spacer and matched with the positioning grooves, the half-ring is connected to the upper end of the lower TC bearing moving sleeve, and the pressure sleeve is pressed on one side of the half-ring and sleeved on the transmission shaft.

2. The screw drill transmission shaft anti-drop mechanism according to claim 1, characterized in that: The cross section of the positioning groove is hemispherical.

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