Internal thread oiling device for negative-angle special buckle and use method of internal thread oiling device

Abstract

The invention discloses an internal thread oiling device for a negative-angle special buckle. The internal thread oiling device comprises a connecting base and a blade assembly. The blade assembly is cylindrical, and a plurality of continuous spiral angle blades are arranged at the top of an outer ring of the cylindrical blade assembly; a grease accumulation cavity is formed in the blade assembly, and the grease accumulation cavity is communicated with the top surface of the blade assembly; the lower end of the connecting base is connected with the central position of the grease accumulation cavity; a grease guide surface is arranged on the bottom surface of the grease accumulation cavity; the rear portion of the spiral angle blade extends to be connected to the top face of the blade assembly, and a circle of grease blocking groove is formed in the connecting position of the rear portion of the spiral angle blade and the top face of the blade assembly. The invention further discloses a using method of the internal thread oiling device for the negative-angle special buckle. The invention provides the special rotation angle oiling device which can uniformly coat semi-solid grease on the internal thread surface and the locking surface of the negative-angle special buckle at the same time and is high in adaptability.

Description

Technical Field

[0001] This invention relates to a workpiece surface coating device, and more specifically, to an internal thread oiling device for negative angle special threads and its method of use. Background Technology

[0002] Before leaving the factory, steel pipe oil casing products need to have rust-preventive grease applied to the threads, and then thread protection rings screwed on. This ensures that no rust or other abnormalities occur during subsequent transportation and storage. For standard API threaded oil casing products, radial grease application is sufficient to achieve full coverage of the internal thread surface with semi-solid grease. Figure 1 As shown.

[0003] With the expanding application of clean energy sources such as natural gas, the demand for gas-tight special threaded oil casing products from domestic and international oil and gas field users is increasing. Currently, commonly used gas-tight special threaded oil casing products generally employ a negative angle thread profile and a negative angle locking surface design to ensure connection and sealing performance. The negative angle thread profile is on the bearing surface of the thread, while the negative angle locking surface is on the external thread end of the pipe body and inside the internal thread of the coupling. This product design makes it difficult to completely coat the internal thread of the coupling with anti-rust grease. This is because existing grease application devices use a radial grease-throwing path, with the oil outlet direction perpendicular to the internal thread. The negative angle thread bottom and negative angle locking surface, located inside the internal thread surface and in the recessed areas inside the through hole, cannot be coated with semi-solid grease. Figure 2 As shown. When the protective ring is screwed on, areas where grease was not fully applied lack grease protection, making them prone to rust and posing a significant quality risk.

[0004] To address the above issues, on-site workers need to manually apply grease first, which significantly reduces production efficiency. Furthermore, some small-sized products still cannot be fully greased due to limited operating space.

[0005] Existing patent applications, such as Chinese patent application number 202023073924.4, disclose a thread oiling device, which belongs to the field of workpiece processing, including a solution for an external thread oiling device for a box body, but the solution does not mention the technical details of the internal thread oiling solution.

[0006] For example, Chinese patent application No. 201910134470.X discloses a steel pipe internal oiling device and its usage method. This solution mentions an oiling solution for the internal threads of steel pipes, but does not mention a solution for oiling the negative angle locking surface and negative angle tooth shape of the airtight special thread. Summary of the Invention

[0007] To address the shortcomings of existing technologies, the purpose of this invention is to provide an internal thread oiling device and its usage method for negative angle special threads. This invention provides a special angle oiling device that can simultaneously and uniformly apply semi-solid grease to both the internal thread surface and the locking surface of negative angle special threads, and is highly adaptable.

[0008] To achieve the above object, the present invention adopts the following technical solutions:

[0009] The first aspect of the present invention provides an internal thread oiling device for a special thread with a negative angle, comprising a connecting base and a blade assembly;

[0010] The blade assembly is cylindrical, and the top of the outer ring of the cylinder is configured with multiple continuous spiral blades.

[0011] The blade assembly has an internal grease collection chamber, which is connected to the top surface of the blade assembly.

[0012] The lower end of the connecting base is connected to the center of the grease accumulation chamber;

[0013] The bottom surface of the grease accumulation cavity is set as a grease guiding surface;

[0014] The rear part of the spiral blade extends to the top surface of the blade assembly, and a grease-blocking groove is provided at the connection between the rear part of the spiral blade and the top surface of the blade assembly.

[0015] Preferably, the diameter of the blade assembly is 30-60 mm.

[0016] Preferably, the number of helical blades is 6 to 12;

[0017] The bending angle between the rear part of the helical blade and the outer side wall of the blade assembly is between 40° and 65°.

[0018] The angle between the grease guiding surface and the outer wall of the blade assembly is between 10° and 40°.

[0019] Preferably, the distance between the grease-blocking groove and the connecting base is 4-6 mm.

[0020] Preferably, the angle between the grease guiding surface and the outer sidewall of the blade assembly is between 10° and 40°.

[0021] The second aspect of the present invention provides a method of using the oiling device for internal threads of special negative angle threads described in the first aspect of the present invention;

[0022] The connecting base is fixed to the oil spray gun base of the oiling mechanism, which drives the blade assembly to rotate and opens the oil delivery pipe valve body. The semi-solid grease in the grease accumulation chamber forms grease accumulation due to the interaction between the grease guiding surface and the grease blocking groove and the continuous influx of semi-solid grease in the oil delivery pipe.

[0023] The oiling mechanism rotates clockwise, driving the blade assembly. The semi-solid grease in the grease accumulation chamber enters the multiple spiral blades along the direction of the grease guide surface. Then, under the action of centrifugal force, the semi-solid grease is evenly distributed circumferentially along the edge of the spiral blades and simultaneously thrown out in the direction of the spiral blades.

[0024] Preferably, after the internal thread oiling device has finished applying oil, the oil supply pipe valve is closed, and the oiling mechanism stops rotating and returns to the initial point, completing one semi-solid grease application operation.

[0025] The present invention provides an internal thread oiling device and its method for use for special negative angle threads, which has the following advantages:

[0026] 1) The multi-blade spiral design of the oil-throwing blades ensures stable oil output and strong directional oil-throwing path;

[0027] 2) The oil ejection path becomes a negative angle, which can be applied to the bottom of the special negative angle internal thread teeth and the negative angle locking surface;

[0028] 3) The internal thread oiling device adopts an oil collection chamber design, which can effectively reduce the phenomenon of semi-solid grease splashing during operation.

[0029] 4) During the oiling process, semi-solid greases are applied evenly, and the grease adhering to the surface of the internal thread is fine, with no grease wasted;

[0030] 5) Reduce manual oiling intervention, improve oiling efficiency, and drive overall improvement in process efficiency;

[0031] 6) Avoid quality risks caused by omissions in manual operation. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the internal oil coating of an existing API threaded coupling;

[0033] Figure 2 This is a schematic diagram of the internal oil coating of an existing negative angle special thread coupling. (a) is an overall schematic diagram, (b) is a schematic diagram of the negative angle tooth profile not covered, and (c) is a schematic diagram of the negative angle locking surface not covered.

[0034] Figure 3 This is a front view schematic diagram of the internal thread oiling device of the present invention;

[0035] Figure 4 This is a cross-sectional schematic diagram of the internal thread oiling device of the present invention;

[0036] Figure 5 This is a top view schematic diagram of the internal thread oiling device of the present invention;

[0037] Figure 6 This is an axial view (bottom view) of the internal thread oiling device of the present invention;

[0038] Figure 7 This is a schematic diagram of the internal thread oiling device of the present invention in use. Detailed Implementation

[0039] To better understand the above-mentioned technical solutions of the present invention, the technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0040] Combination Figures 3 to 6 As shown, the present invention provides an internal thread oiling device for a special negative angle thread, comprising a connecting base 1 and a blade assembly 2.

[0041] The blade assembly 2 is cylindrical, and the top of the outer ring of the cylinder is provided with multiple continuous spiral blades 201.

[0042] The blade assembly 2 has a grease accumulation chamber 202 inside, which is connected to the top surface of the blade assembly 2.

[0043] The lower end of the connecting base 1 is connected to the center of the bottom of the grease accumulation chamber 202.

[0044] The bottom surface of the grease accumulation cavity 202 is set as the grease guiding surface 203.

[0045] The rear part of the spiral blade 201 extends to the top surface of the blade assembly 2, and a radial grease baffle groove 204 is provided at the connection between the rear part of the spiral blade 201 and the top surface of the blade assembly 2, so that the grease accumulation chamber 202 forms a semi-enclosed space.

[0046] The diameter of blade assembly 2 is 30-60 mm.

[0047] The number of helical blades 201 can be set to 6 to 12 depending on the diameter of the special internal thread produced, and they are evenly distributed along the circumferential direction of the bottom of the blade assembly 2; and the bending angle α between the rear part of the helical blade 201 and the outer side wall of the blade assembly 2 is between 40 and 65°.

[0048] The distance between the grease-blocking groove 204 and the outer surface of the connecting base 1 is 4-6mm, which facilitates the oil pipe 4 to enter the interior of the internal thread oiling device of the present invention, and can effectively block semi-solid greases to prevent them from being thrown out from the rear of the internal thread oiling device of the present invention.

[0049] The included angle b between the grease guiding surface 203 and the outer wall of the blade assembly 2 is between 10° and 40°, which is used to guide semi-solid grease to smoothly enter the spiral blade 201.

[0050] Combination Figure 7 As shown, the present invention also provides a method of using the internal thread oiling device of the present invention:

[0051] The connecting base 1 is fixed to the oil spray gun base 3 of the oiling mechanism, which drives the blade assembly 2 to rotate and open the oil supply pipe valve body. The semi-solid grease flows through the oil supply pipe 4 into the grease accumulation chamber 202. Relying on the interaction between the grease guide surface 203 and the grease baffle groove 204 and the continuous influx of semi-solid grease into the oil supply pipe 4, grease accumulation is formed.

[0052] The oiling mechanism rotates clockwise to drive the blade assembly 2. The semi-solid grease in the grease accumulation chamber 202 enters the multiple spiral blades 201 along the direction of the grease guide surface 203. Then, under the action of centrifugal force, the semi-solid grease is evenly distributed circumferentially along the edge of the spiral blades 201 and is directionally thrown out along the spiral direction of the spiral blades 201.

[0053] As the internal thread oiling device of this invention enters the interior along the axial direction of the internal thread, it performs a directional application of semi-solid grease to the internal thread and negative angle locking surface of the steel pipe. After the internal thread oiling device completes the application, the oil supply valve is closed, and the oiling mechanism stops rotating and returns to its initial point, completing one semi-solid grease application operation. Furthermore, the entire oiling process can be programmed for automated control.

[0054] The internal thread oiling device of the present invention achieves a spraying effect with a greater radial vertical range than conventional oiling devices through the angle opening design of the helical blade 201. It can effectively cover the negative angle tooth shape of 0 to 45° and the negative angle locking surface of 0 to 45°. At the same time, it can be combined with the size of the internal space of the coupling to use at least 8 helical blades 201 to ensure the uniformity of grease spraying.

[0055] In summary, the internal thread oiling device of this invention can be used to apply semi-solid grease to the internal threads of oil well pipes. It is compatible with various types and viscosities of thread storage grease and thread thread lubricant, and can meet the oiling requirements of various ordinary internal threads and airtight special internal threads with negative angle tooth profiles and negative angle locking surfaces. It can ensure complete grease coating on the surface of airtight special internal threads of steel pipes while ensuring uniform grease coating at the negative angle locking surfaces, and has broad application prospects in the field of oil well pipe and casing internal thread coating.

[0056] Example 1

[0057] Continue to refer Figure 7 As shown, grease is applied to the internal thread of a special threaded sleeve with a negative angle and an outer diameter of 139.7mm. In this embodiment, the internal thread grease applicator uses 12 helical blades 201. The internal thread grease applicator is fastened to the grease spray gun base 3 of the grease applicator mechanism with screws. The belt rotates clockwise, causing the grease spray gun base 3 and the internal thread grease applicator to rotate clockwise simultaneously. In conjunction with the valve body on the oil supply pipe 4, semi-solid grease flows in. In the grease accumulation chamber 202 of the internal thread grease applicator, grease accumulates due to the interaction of the grease guide surface 203 and the grease baffle groove 204 and the continuous influx of semi-solid grease into the oil supply pipe 4. Driven by the clockwise rotating oil-throwing mechanism, the semi-solid grease in the grease collection chamber 202 enters the spiral vane 201 at the top of the internal thread oiling device along the direction of the grease guide surface 203. Under the action of centrifugal force, the semi-solid grease is evenly distributed circumferentially along the spiral vane 201, and at the same time, it is directionally thrown out along the spiral direction of the spiral vane 201. The semi-solid grease covers the 10° negative angle tooth bottom and the 30° negative angle locking surface of the product.

[0058] In this embodiment 1, the diameter of the blade assembly 2 is 40mm; the bending angle α between the rear part of the helical blade 201 and the outer wall of the blade assembly 2 is 50°; the angle b between the grease guide surface 203 and the outer wall of the blade assembly 2 is 20°; and the distance between the grease baffle groove 204 and the outer surface of the connecting base 1 is 5mm.

[0059] As the internal thread oiling device enters the interior along the internal thread axis, it applies semi-solid grease in a directional manner to the internal thread surface and the negative angle locking surface of the steel pipe. After oiling is completed, the valve on the oil supply pipe 4 is closed, and the entire internal thread oiling device returns to the initial point, completing one oiling cycle.

[0060] Example 2

[0061] Continue to refer Figure 7As shown, grease is applied to the internal thread of a special threaded sleeve with a negative angle and an outer diameter of 73.02mm. In this embodiment, the internal thread grease applicator uses 8 helical blades 201. The internal thread grease applicator is fastened to the grease spray gun base 3 of the grease applicator mechanism with screws. The belt rotates clockwise, causing the grease spray gun base 3 and the internal thread grease applicator to rotate clockwise simultaneously. In conjunction with the valve body on the oil supply pipe 4, semi-solid grease flows in. In the grease accumulation chamber 202 of the internal thread grease applicator, grease accumulates due to the interaction of the grease guide surface 203 and the grease baffle groove 204 and the continuous influx of semi-solid grease into the oil supply pipe 4. Driven by the clockwise rotating oil-throwing mechanism, the semi-solid grease in the grease collection chamber 202 enters the spiral vane 201 at the top of the internal thread oiling device along the direction of the grease guide surface 203. Under the action of centrifugal force, the semi-solid grease is evenly distributed circumferentially along the spiral vane 201, and at the same time, it is directionally thrown out along the spiral direction of the spiral vane 201. The semi-solid grease covers the 5° negative angle tooth bottom and the 15° negative angle locking surface of the product.

[0062] In this embodiment 2, the diameter of the blade assembly 2 is 50mm; the bending angle α between the rear part of the helical blade 201 and the outer side wall of the blade assembly 2 is 60°; the angle b between the grease guide surface 203 and the outer side wall of the blade assembly 2 is 30°; and the distance between the grease baffle groove 204 and the outer surface of the connecting base 1 is 6mm.

[0063] As the internal thread oiling device enters the interior along the internal thread axis, it applies semi-solid grease in a directional manner to the internal thread surface and the negative angle locking surface of the steel pipe. After oiling is completed, the valve on the oil supply pipe 4 is closed, and the entire internal thread oiling device returns to the initial point, completing one oiling cycle.

[0064] Those skilled in the art should recognize that the above embodiments are merely illustrative of the present invention and are not intended to limit the present invention. Any variations or modifications to the above embodiments that are within the spirit and essence of the present invention will fall within the scope of the claims of the present invention.

Claims

1. A device for applying oil to internal threads of special negative angle threads, characterized in that: Includes connecting base and blade assembly; The blade assembly is cylindrical, and the top of the outer ring of the cylinder is configured with multiple continuous spiral blades. The blade assembly has an internal grease collection chamber, which is connected to the top surface of the blade assembly. The lower end of the connecting base is connected to the center of the grease accumulation chamber; The bottom surface of the grease accumulation cavity is set as a grease guiding surface; The rear part of the spiral blade extends to the top surface of the blade assembly, and a grease-blocking groove is provided at the connection between the rear part of the spiral blade and the top surface of the blade assembly.

2. The oiling device for internal threads of special negative angle threads according to claim 1, characterized in that: The diameter of the blade assembly is 30-60 mm.

3. The oiling device for internal threads of special negative angle threads according to claim 1, characterized in that: The number of spiral blades is 6 to 12; The bending angle between the rear part of the helical blade and the outer side wall of the blade assembly is between 40° and 65°. The angle between the grease guiding surface and the outer wall of the blade assembly is between 10° and 40°.

4. The oiling device for internal threads of special negative angle threads according to claim 1, characterized in that: The distance between the grease baffle groove and the connecting base is 4-6 mm.

5. The oiling device for internal threads of special negative angle threads according to claim 1, characterized in that: The angle between the grease guiding surface and the outer wall of the blade assembly is between 10° and 40°.

6. A method of using the oiling device for internal threads with negative angle special threads as described in any one of claims 1-5, characterized in that: The connecting base is fixed to the oil spray gun base of the oiling mechanism, which drives the blade assembly to rotate and opens the oil delivery pipe valve body. The semi-solid grease in the grease accumulation chamber forms grease accumulation due to the interaction between the grease guiding surface and the grease blocking groove and the continuous influx of semi-solid grease in the oil delivery pipe. The oiling mechanism rotates clockwise, driving the blade assembly. The semi-solid grease in the grease accumulation chamber enters the multiple spiral blades along the direction of the grease guide surface. Then, under the action of centrifugal force, the semi-solid grease is evenly distributed circumferentially along the edge of the spiral blades and simultaneously thrown out in the direction of the spiral blades.

7. The method of use according to claim 6, characterized in that: After the internal thread oiling device has finished applying oil, the oil supply pipe valve is closed, and the oiling mechanism stops rotating and returns to the initial point, completing one semi-solid grease application operation.

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