Brake pad for petroleum drilling machine

Abstract

The utility model relates to the field of brake pads, in particular to a petroleum drilling machine brake pad. A brake pad of a petroleum drilling machine comprises a disc body. A plurality of friction material layers are arranged on the disc body; the disc body is of a solid structure; the friction material layers are installed on the disc body in a circumferential array mode. An airflow channel is formed between every two adjacent friction material layers; when the disc body rotates, air flow penetrates through the air flow channel, and the air flow channel is gradually narrowed in the flowing direction of the air flow. When the petroleum drilling machine brake pad conducts friction braking, generated chippings enter the corresponding airflow channels on the same side of the disc body from the front face and the back face of the disc body respectively and are discharged outwards along with airflow movement in the airflow channels. The beneficial effects of the utility model are that the air flow channel is constructed through the structure of the friction material layer, and the heat dissipation effect is improved through the flowing of the air flow during rotation; and moreover, the gradually narrowed airflow channel has an acceleration effect on the airflow velocity, so that the chippings are quickly discharged.

Description

Technical Field

[0001] The utility model relates to the field of brake pads, in particular to a brake pad for an oil drilling rig. Background Art

[0002] During oil drilling, the oil rig drives the drilling tool to break the rock, drill underground, and drill a wellbore of a specified depth for the oil or gas extraction machine to obtain oil or natural gas.

[0003] The existing oil drilling rig brake pads have poor heat dissipation performance. In addition, the friction impurities generated by the wear of the brake pads are discharged slowly, and the friction impurities aggravate the damage of the brake pads during the re-friction of the brake pads.

[0004] For example, the traditional brake pad is set in a disc shape, usually composed of two brake discs and a heat dissipation fan in the middle. The surface of the brake disc is provided with heat dissipation holes for air intake into the interlayer space between the two brake discs. When the brake pad rotates, the heat dissipation fan completes the air flow movement to achieve heat dissipation. In addition, a sink is set on the brake disc for dust collection and chip removal.

[0005] For example, the brake disc disclosed in 202022486147.X has an efficient air intake that can quickly draw cold air from the outside of the first brake disc and the second brake disc into the space between the first brake disc and the second brake disc, absorbing the heat of the first brake disc and the second brake disc. The air that has absorbed the heat is discharged to the outside through eight rotating exhaust plates. Similarly, the brake disc disclosed in 201921323285.7 also has an interlayer space, uses ventilation holes to intake air into the internal interlayer space, and then exhausts it radially outward.

[0006] Although this hollow structure has a good heat dissipation effect, its strength is relatively low due to the characteristics of the hollow structure. Therefore, it is necessary to improve the brake pad structure and its heat dissipation structure, and study a brake pad that improves the heat dissipation effect while maintaining high strength.

[0007] In addition, for the traditional brake disc with a raised center hub on one side (202022486147.X), how to set up the air duct structure on the back side and solve the problem of removing impurities inside the center hub at the same time is also a difficulty that needs to be solved. Utility Model Content

[0008] The utility model aims to provide a brake pad for an oil drilling rig to solve the problems raised in the above-mentioned background technology.

[0009] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0010] A petroleum drilling rig brake pad comprises: a disc body; a plurality of friction material layers are arranged on the disc body; the friction material layers are mounted on the disc body in a circumferential array; the disc body is a solid structure; an air flow channel is formed between two adjacent friction material layers; when the disc body rotates, the air flow passes through the air flow channel and the air flow channel gradually narrows in the flow direction of the air flow;

[0011] The disc body is provided with a central hub for installation; the central hub is formed with a concave cavity; the concave cavity is formed with a slag discharge air hole; impurities in the concave cavity can pass through the slag discharge air hole through the cavity bottom of the concave cavity along the axial direction of the rotation axis of the disc body and pass through the slag discharge air hole through the cavity wall of the concave cavity along the radial direction of the rotation axis of the disc body;

[0012] Multiple friction material layers are symmetrically arranged on both sides of the disc body; the side facing the concave cavity opening is defined as the front side of the disc body, and the opposite side is defined as the back side of the disc body; the air flow channels on the back side of the disc body are aligned and connected to the slag discharge holes;

[0013] When a brake pad of an oil drilling rig is used for friction braking, the generated debris enters the corresponding air flow channels on the same side from the front and back sides of the disc body respectively, and is discharged outward along with the air flow in the air flow channel.

[0014] As a further solution of the utility model: the slag discharge holes include: a bottom hole located at the bottom of the concave cavity and a side wall hole located at the side wall of the concave cavity; the bottom hole and the side wall hole are interconnected to form a whole; a part of the side wall hole away from the bottom hole is aligned with and connected to the air flow channel on the back of the disc body, and a part of the side wall hole close to the bottom hole is exposed on the outside of the air flow channel.

[0015] As a further solution of the utility model: the side wall hole extends along the axial direction of the rotation axis of the disk body and simultaneously connects the air flow channels on the front and back sides of the disk body.

[0016] As a further solution of the utility model: the upper and lower surfaces of the friction material layer are parallel planes to each other and the projections of the contours of the upper and lower surfaces of the friction material layer in the axial direction along the rotation axis of the disk body coincide; the lower surface of the friction material layer is arranged toward the disk body; any point on the lower surface of the friction material layer is in contact with the disk body.

[0017] As a further solution of the utility model: the channel walls on both sides of the airflow channel are planes parallel to the rotation axis of the disk body, and the channel walls on both sides of the airflow channel are not parallel; the channel walls on both sides of the airflow channel are respectively composed of side surfaces of two friction material layers.

[0018] As a further solution of the utility model: the angle between one of the channel walls on both sides of the airflow channel and the radial extension line at the entrance of the airflow channel is set to be 30° to 40°.

[0019] As a further solution of the utility model: the angle between the other one of the channel walls on both sides of the airflow channel and the radial extension line at the entrance of the airflow channel is set to be 45° to 55°.

[0020] As a further solution of the utility model: the angle between the channel walls on both sides of the airflow channel is set to 3° to 7°.

[0021] As a further solution of the utility model: the ratio of the depth of the airflow channel to the thickness of the friction material layer is greater than or equal to 0.8 and less than or equal to 1.

[0022] As a further solution of the utility model: the friction end surface of the friction material layer is a fan-shaped trapezoid; the upper and lower sides of the fan-shaped trapezoid are concentric circular arcs; the left and right sides of the fan-shaped trapezoid are two straight line segments inclined to each other; the two straight line segments respectively connect the two ends of the two circular arcs.

[0023] As a further solution of the utility model: the number of friction material layers arranged in a circumferential array on the same side of the disc body is an odd number. Specifically, the number of friction material layers arranged in a circumferential array on the same side of the disc body is 7, 9 or 11.

[0024] As a further solution of the utility model: a plurality of positioning grooves are formed on the disc body; the friction material layer is located in the positioning grooves; a positioning convex rib is formed on the disc body between two adjacent positioning grooves; the positioning convex rib separates two adjacent positioning grooves; and the top surface of the positioning convex rib constitutes the bottom surface of the airflow channel.

[0025] As a further solution of the utility model: two adjacent positioning convex ribs are located on both sides of the friction material layer in the circumferential direction of the rotation axis of the disc body to position the friction material layer; and the positioning groove is openly arranged in the radial direction of the disc body.

[0026] As a further solution of the utility model: the friction material layer is installed to the disc body by means of bolt connection.

[0027] Compared with the prior art, the beneficial effects of the utility model are: an air flow channel is constructed through the structure of the friction material layer, and the heat dissipation effect is improved through the flow of air during rotation; and the gradually narrowing air flow channel has an acceleration effect on the air flow velocity, and debris is quickly discharged.

[0028] Compared with the traditional hollow structure heat dissipation method, the brake pad structure and heat dissipation method are reconstructed to improve the heat dissipation effect while ensuring high strength.

[0029] The cooperation of the slag discharge holes and the air flow channel can provide an air inlet, so that the air flow channel on the back of the disk can flow as smoothly as the air flow channel on the front, thereby ensuring the heat dissipation effect.

[0030] In addition, compared with the traditional method of setting up a dust collecting trough to receive friction debris or not collecting debris, the debris is directly received through the air flow channel, and the airflow in the air flow channel can be used to quickly discharge the debris. The gradually shrinking air flow channel also increases the air flow rate to avoid debris deposition. In the traditional method of using a dust collecting trough to collect debris, the debris may be affected by the vibration again after rotating one circle with the disk in the dust collecting trough and jump out of the dust collecting trough and enter between the two surfaces that are rubbing against each other. Without setting up a dust collecting trough, the two larger circumferential friction zones cause the debris to be squeezed between the two relatively rubbing parts for a long time, affecting the braking effect.

[0031] The arrangement of the slag discharge holes enables friction impurities to be discharged in both radial and axial directions, thereby improving the slag discharge effect and preventing impurities from being deposited in the cavity. The slag discharge holes are aligned and connected with the air flow channel, and the air flow movement of the air flow channel can also accelerate the discharge of impurities.

[0032] The structural setting of the positioning groove facilitates the positioning and installation of the friction material layer. The positioning groove is positioned by two positioning ribs on the circumference and is open in the radial direction, which facilitates the processing of the positioning groove and the installation of the friction material layer.

[0033] Other features and advantages of the present invention will be disclosed in detail in the following specific implementations and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a three-dimensional diagram of a brake pad for an oil drilling rig of the utility model;

[0035] Figure 2 yes Figure 1 A three-dimensional image of an oil rig brake pad from another perspective;

[0036] Figure 3 yes Figure 1 A front view of a brake pad for an oil rig;

[0037] Figure 4 yes Figure 1 A right side view of an oil rig brake pad;

[0038] Figure 5 yes Figure 1 A rear view of an oil rig brake pad;

[0039] Figure 6 yes Figure 1 An exploded view of an oil rig brake pad shows the friction material layer on one side separated from the disc body.

[0040] List of reference numerals: oil rig brake pad 100, disc body 10, positioning rib 11, positioning groove 12, center hub 13, concave cavity 131, slag discharge hole 132, bottom hole 1321, side wall hole 1322, friction material layer 20, countersunk hole 21, air flow channel 101. DETAILED DESCRIPTION

[0041] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0042] See also Figures 1 to 6 In an embodiment of the utility model, a brake pad 100 for an oil drilling rig includes: a disc body 10. A plurality of friction material layers 20 are provided on the disc body 10. The friction material layers 20 are mounted to the disc body 10 in a circumferential array. The disc body 10 is a solid structure, that is, no hollow structure is provided, and no air flow channel is provided inside. An air flow channel 101 is formed between two adjacent friction material layers 20. When the disc body 10 rotates, the air flow passes through the air flow channel 101 and the air flow channel 101 gradually narrows in the flow direction of the air flow.

[0043] As a specific embodiment, the disc body 10 is provided with a central hub 13. The central hub 13 is used for installation. Specifically, the central hub 13 is provided with a plurality of bolt holes to facilitate the installation of the disc body 10. The central hub 13 is formed with a concave cavity 131. The concave cavity 131 is formed with a slag discharge air hole 132. Friction impurities can pass through the cavity wall of the concave cavity 131 through the slag discharge air hole 132 along the axial direction and radial direction of the rotation axis of the disc body 10.

[0044] Impurities in the concave cavity 131 can pass through the slag discharge air hole 132 along the axial direction of the rotation axis of the disk body 10 through the cavity bottom of the concave cavity 131 and pass through the slag discharge air hole 132 along the radial direction of the rotation axis of the disk body 10 through the cavity wall of the concave cavity 131. This arrangement enables the disk body 10 to quickly discharge friction impurities in the concave cavity 131 regardless of whether it is installed vertically or horizontally.

[0045] As a specific embodiment, a plurality of friction material layers 20 are symmetrically arranged on both sides of the disc body 10. The friction material layers 20 on both sides of the disc body 10 are arranged in mirror symmetry. The side to which the concave cavity 131 opens is defined as the front side of the disc body 10, and the opposite side is defined as the back side of the disc body 10; the air flow channel 101 on the back side of the disc body 10 is aligned and connected to the slag discharge air hole 132.

[0046] When a brake pad 100 for a petroleum drilling machine is used for friction braking, the generated debris enters the corresponding airflow channel 101 on the same side from the front and back sides of the disc body 10, and is discharged outwardly along with the airflow in the airflow channel 101. That is, the debris generated by the braking friction on the front side of the disc body 10 enters the airflow channel 101 on the front side of the disc body 10 from the front side of the disc body 10, and is discharged outwardly along with the airflow in the airflow channel 101. The debris generated by the braking friction on the back side of the disc body 10 enters the airflow channel 101 on the back side of the disc body 10 from the back side of the disc body 10, and is discharged outwardly along with the airflow in the airflow channel 101.

[0047] As a specific implementation, the slag discharge air hole 132 is aligned with the air flow channel 101. The air flow passes through the slag discharge air hole 132 and through the wall of the concave cavity 131 into the air flow channel 101. The air flow movement can be used to improve the impurity discharge efficiency in the concave cavity 131.

[0048] As a specific embodiment, the slag discharge air hole 132 includes: a bottom hole 1321 and a side wall hole 1322. The bottom hole 1321 is located at the bottom of the cavity 131. The side wall hole 1322 is located at the side wall of the cavity 131. The bottom hole 1321 and the side wall hole 1322 are connected to each other to form a whole. A portion of the side wall hole 1322 away from the bottom hole 1321 is aligned with and connected to the air flow channel 101 at the back of the disc body 10, and a portion of the side wall hole 1322 close to the bottom hole 1321 is exposed outside the air flow channel 101.

[0049] The side wall hole 1322 extends in the axial direction of the rotation axis of the disk body 10 and connects the air flow channels 101 on the front and back sides of the disk body 10 .

[0050] The side wall holes 1322 are aligned with the air flow channel 101. The bottom hole 1321 and the side wall holes 1322 are interconnected to form a whole, which makes it easy to process the slag removal holes 132. Compared with the separated multi-hole method, it does not require multiple tool lifts and passes for machining, and it is simple to process the core block for casting. The side wall holes 1322 are aligned with the air flow channel 101, so that the slag removal holes 132 also serve as the air inlet of the air flow channel 101, and there is no need to process the air inlet separately. This method also allows the bulging side of the center hub 13 to maintain a larger friction area of ​​the friction material layer 20 while maintaining a larger volume of the center hub 13.

[0051] As a specific implementation, the friction material layer 20 is provided on both the front and back sides of the disc body 10. The side wall hole 1322 is connected to the air flow channel 101 on both the front and back sides of the disc body 10.

[0052] The upper and lower surfaces of the friction material layer 20 are parallel planes, and the projections of the upper and lower surfaces of the friction material layer 20 in the axial direction along the rotation axis of the disc body 10 overlap; the lower surface of the friction material layer 20 is arranged toward the disc body 10; any point on the lower surface of the friction material layer 20 fits the disc body 10. That is, no recess or empty groove structure is arranged at the position where the disc body 10 and the friction material layer 20 contact. The specific structure of the friction material layer 20 cooperates with the specific structure of the disc body 10, so that the extrusion force received by each point on the upper surface of the friction material layer 20 can be directly transmitted to the disc body 10 in the axial direction. Combined with the non-hollow solid structure of the disc body 10, a high structural strength is ensured.

[0053] As a specific implementation, the channel walls on both sides of the airflow channel 101 are planes parallel to the rotation axis of the disk body 10, and the channel walls on both sides of the airflow channel 101 are not parallel; the channel walls on both sides of the airflow channel 101 are respectively composed of the side surfaces of two friction material layers 20.

[0054] The angle α between one of the channel walls on both sides of the airflow channel 101 and the radial extension line at the entrance of the airflow channel 101 is set to be 30° to 40°. The angle β between the other channel wall on both sides of the airflow channel 101 and the radial extension line at the entrance of the airflow channel 101 is set to be 45° to 55°.

[0055] As a specific implementation, the angle α between one of the channel walls on both sides of the airflow channel 101 and the radial extension line at the entrance of the airflow channel 101 is set to 36°. The angle β between the other channel wall on both sides of the airflow channel 101 and the radial extension line at the entrance of the airflow channel 101 is set to 49°.

[0056] The angle γ between the channel walls on both sides of the airflow channel 101 is set to 3° to 7°. As a specific implementation, the angle γ between the channel walls on both sides of the airflow channel 101 is set to 5°.

[0057] The ratio of the depth of the airflow channel 101 to the thickness of the friction material layer 20 is greater than or equal to 0.8 and less than or equal to 1. The depth of the airflow channel 101 is the dimension of the airflow channel 101 in the axial direction of the disc body 10. Similarly, the thickness of the friction material layer 20 is also the dimension of the friction material layer 20 in the axial direction of the disc body 10. Specifically, the ratio of the depth of the airflow channel 101 to the thickness of the friction material layer 20 is set to 0.875.

[0058] A plurality of positioning grooves 12 are formed on the disc body 10. The friction material layer 20 is located in the positioning grooves 12. The disc body 10 forms a positioning convex rib 11 between two adjacent positioning grooves 12. The positioning convex rib 11 separates two adjacent positioning grooves 12. The top surface of the positioning convex rib 11 constitutes the channel bottom surface of the airflow channel 101.

[0059] As a specific implementation, two adjacent positioning ribs 11 are located on both sides of the friction material layer 20 in the circumferential direction of the rotation axis of the disc body 10 to position the friction material layer 20. The positioning groove 12 is openly arranged in the radial direction of the disc body 10. The friction material layer 20 is limited only on two sides instead of all around, which facilitates the processing of the positioning groove and the installation of the friction material layer.

[0060] As a specific embodiment, the friction material layer 20 is installed to the disc body 10 by bolt connection. As a specific embodiment, the friction end surface of the friction material layer 20 is a fan-shaped trapezoid. The upper and lower sides of the fan-shaped trapezoid are concentric circular arcs. The left and right sides of the fan-shaped trapezoid are two straight line segments arranged obliquely to each other. The two straight line segments respectively connect the two ends of the two circular arcs.

[0061] As a specific implementation, the number of friction material layers 20 arranged in a circular array on the same side of the disc body 10 is an odd number. Specifically, the number of friction material layers 20 arranged in a circular array on the same side of the disc body 10 is 7, 9 or 11. A smaller number will result in insufficient airflow channels 101 for receiving and removing chips, and the chips will be in the friction position for a longer period of time, affecting the braking effect. For example, the method of setting 3 or 4 layers cannot assume the chip removal function, that is, it does not have the chip removal effect. The increase in the number also increases the risk of edge contact friction collision. In addition, an excessive number also complicates the processing and installation of the friction material layer 20.

[0062] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

[0063] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A brake pad for an oil drilling rig, comprising: A disc body (10); a plurality of friction material layers (20) are provided on the disc body (10); the friction material layers (20) are mounted on the disc body (10) in a circumferential array; the disc body (10) is characterized in that the disc body (10) is a solid structure; an airflow channel (101) is formed between two adjacent friction material layers (20); when the disc body (10) rotates, airflow passes through the airflow channel (101) and the airflow channel (101) gradually narrows in the flow direction of the airflow; The disk body (10) is provided with a central hub (13) for installation; the central hub (13) is formed with a concave cavity (131); the concave cavity (131) is formed with a slag discharge air hole (132); impurities in the concave cavity (131) can pass through the slag discharge air hole (132) along the axial direction of the rotation axis of the disk body (10) through the cavity bottom of the concave cavity (131) and pass through the slag discharge air hole (132) along the radial direction of the rotation axis of the disk body (10) through the cavity wall of the concave cavity (131); The plurality of friction material layers (20) are symmetrically arranged on both sides of the disc body (10); the side to which the concave cavity (131) opens is defined as the front side of the disc body (10), and the opposite side is defined as the back side of the disc body (10); the air flow channel (101) on the back side of the disc body (10) is aligned with and connected to the slag discharge air hole (132); When the oil drilling rig brake pad is frictionally braked, the generated debris enters the corresponding air flow channel (101) on the same side from the front and back sides of the disc body (10) respectively, and is discharged outward along with the movement of the air flow in the air flow channel (101).

2. The oil drilling rig brake pad according to claim 1, characterized in that: The slag discharge pores (132) include: a bottom hole (1321) located at the bottom of the cavity (131) and a side wall hole (1322) located at the side wall of the cavity (131); the bottom hole (1321) and the side wall hole (1322) are interconnected to form a whole; a portion of the side wall hole (1322) away from the bottom hole (1321) is aligned with and connected to the air flow channel (101) at the back of the disc body (10), and a portion of the side wall hole (1322) close to the bottom hole (1321) is exposed outside the air flow channel (101).

3. The oil drilling rig brake pad according to claim 2, characterized in that: The side wall hole (1322) extends in the axial direction of the rotation axis of the disk body (10) and is connected to the air flow channel (101) on the front and back sides of the disk body (10).

4. The oil drilling rig brake pad according to claim 1, characterized in that: The upper and lower surfaces of the friction material layer (20) are parallel planes, and the projections of the contours of the upper and lower surfaces of the friction material layer (20) in the axial direction along the rotation axis of the disc body (10) coincide with each other; the lower surface of the friction material layer (20) is arranged toward the disc body (10); and any point on the lower surface of the friction material layer (20) is in contact with the disc body (10).

5. The oil drilling rig brake pad according to claim 1, characterized in that: The channel walls on both sides of the airflow channel (101) are planes parallel to the rotation axis of the disc body (10), and the channel walls on both sides of the airflow channel (101) are not parallel; the channel walls on both sides of the airflow channel (101) are respectively formed by the side surfaces of the two friction material layers (20).

6. The oil drilling rig brake pad according to claim 5, characterized in that: The angle between one of the channel walls on both sides of the airflow channel (101) and the radial extension line at the entrance of the airflow channel (101) is set to be 30° to 40°, The angle between the other one of the channel walls on both sides of the airflow channel (101) and the radial extension line at the entrance of the airflow channel (101) is set to be 45° to 55°.

7. The oil drilling rig brake pad according to claim 5, characterized in that: The included angle between the channel walls on both sides of the airflow channel (101) is set to be 3° to 7°.

8. The oil drilling rig brake pad according to claim 1, characterized in that: The ratio of the depth of the airflow channel (101) to the thickness of the friction material layer (20) is greater than or equal to 0.8 and less than or equal to 1; wherein the depth of the airflow channel (101) is the dimension of the airflow channel (101) in the axial direction of the disc body (10).

9. The oil drilling rig brake pad according to claim 1, characterized in that: The friction end surface of the friction material layer (20) is in the shape of a fan-shaped trapezoid; the upper and lower sides of the fan-shaped trapezoid are concentric circular arcs; the left and right sides of the fan-shaped trapezoid are two straight line segments arranged obliquely to each other; and the two straight line segments respectively connect the two ends of the two circular arcs.

10. The oil drilling rig brake pad according to claim 1, characterized in that: The number of the friction material layers (20) arranged in a circumferential array on the same side of the disc body (10) is 7, 9 or 11.

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