A composite impact drill

Abstract

The present application is applicable to the technical field of drilling tools, and provides a composite impact drill tool, comprising a housing, a driving part, an output part, an elastic part, a first impact part, and a second impact part. The driving part is used to drive the output part to rotate around the rotation axis, and the elastic part, the first impact part, and the second impact part are sequentially arranged in the inner cavity of the housing along the extension direction of the rotation axis, and the first impact part is slidably mounted on the output part. The first impact part is provided with a first matching part, and the second impact part is provided with a second matching part. The first matching part has a first matching surface, and the second matching part has a second matching surface, and at least one of the first matching surface and the second matching surface is a guide bevel. Under the interaction of the first matching part and the second matching part, it can automatically switch between the composite impact mode and the pure rotation mode according to the resistance encountered by the drill bit on the second impact part, so that the drilling efficiency is higher, the production cost is lower, and it can also protect the drill bit and increase the service life.

Description

Technical Field

[0001] The present application relates to the technical field of drilling tools, and more specifically, to a composite percussion drilling tool. Background Art

[0002] Obtaining accurate underground rock samples for testing and analysis is a crucial step in modern geological exploration and engineering construction. Drilling tools are typically used to extract underground rock samples. Due to the complex underground geological structure, drill tools sometimes encounter soft soil structures and sometimes hard rock structures during drilling. Traditional drilling tools generally only support adjustable drill bit speed, resulting in a single drilling mode and low drilling efficiency.

[0003] In order to enrich the drilling modes of drilling tools, some improved drilling tools have appeared on the market. These improved drilling tools can realize two modes: rotation drilling and axial impact drilling. The drilling mode can be switched according to different geological structures to improve drilling efficiency. Although the above-mentioned improved drilling tools have improved drilling efficiency compared with traditional drilling tools, some of the improved drilling tools driven by a single motor need to be shut down before switching the drilling mode, which is cumbersome to operate and still results in low drilling efficiency. In addition, some improved drilling tools driven by a single motor can simultaneously rotate and impact axially, but this will cause the drill bit to vibrate with a large amplitude during the drilling process, making the drill bit easily damaged. In addition, some improved drilling tools driven by dual motors can switch the drilling mode without stopping the machine, but the dual motor drive not only increases the occupied space and weight of the drilling tool, but also increases the production cost. Summary of the Invention

[0004] The purpose of the embodiments of the present application is to provide a composite percussion drill tool, aiming to solve the technical problems in the prior art such as low drilling efficiency of drill tools, easy damage to drill bits, and high production costs.

[0005] To achieve the above-mentioned object, the technical solution adopted in the present application is as follows: providing a composite percussion drill tool, comprising a housing, a driving portion, an output portion, an elastic portion, a first impact portion, and a second impact portion, wherein the housing has an inner cavity, the driving portion is transmission-connected to the output portion, the driving portion is used to drive the output portion to rotate around a rotation axis, at least a portion of the output portion extends into the inner cavity, the elastic portion, the first impact portion, and the second impact portion are sequentially arranged in the inner cavity along the extension direction of the rotation axis, the first impact portion is slidably mounted on the output portion along the extension direction of the rotation axis, the elastic portion is located between the first impact portion and a side wall of the inner cavity, and the second impact portion is used to connect to a drill bit;

[0006] The first impact portion has a first surface facing the second impact portion, and the first surface is protrudingly provided with a first matching portion; the second impact portion has a second surface facing the first impact portion, and the second surface is protrudingly provided with a second matching portion; the first matching portion has a first matching surface capable of contacting the second matching portion, and the second matching portion has a second matching surface capable of contacting the first matching portion; at least one of the first matching surface and the second matching surface is a guide inclined surface, and the guide inclined surface is inclined relative to the extension direction and circumferential direction of the rotation axis.

[0007] In a possible design, the first matching portion further has a first vertical surface, and the first vertical surface and the first matching surface are respectively located on two opposite sides of the first matching portion in a circumferential direction around the rotation axis;

[0008] The second matching portion further has a second vertical surface, and the second vertical surface and the second matching surface are respectively located on two opposite sides of the second matching portion in the circumferential direction around the rotation axis;

[0009] The first vertical plane and the second vertical plane are both parallel to the rotation axis.

[0010] In a possible design, a side of the first matching portion facing the second matching portion further has a first transition surface, the first transition surface extending circumferentially around the rotation axis and connecting the first matching surface and the first vertical surface;

[0011] The second matching portion further has a second transition surface on a side facing the first matching portion. The second transition surface extends circumferentially around the rotation axis and connects the second matching surface and the second vertical surface.

[0012] In a possible design, the first surface is further provided with a first impact structure protruding from the first surface, and the height of the first impact structure protruding from the first surface is greater than or equal to the height of the first matching portion protruding from the first surface;

[0013] The second surface is further provided with a second impact structure protruding from the second surface, and the height of the second impact structure protruding from the second surface is greater than or equal to the height of the second matching portion protruding from the second surface;

[0014] The first impact structure has a first impact surface on a side facing the second impact structure, and the second impact structure has a second impact surface on a side facing the first impact structure. The first impact surface is configured to abut against the second impact surface.

[0015] In a possible design, the first impact structure and the second impact structure are both annular structures or cylindrical structures, and the axes of the first impact structure and the second impact structure both coincide with the rotation axis.

[0016] In one possible design, the first impact surface and the second impact surface are both conical surfaces, the first impact surface and the second impact surface are both arranged around the rotation axis, and the first impact surface and the second impact surface are both arranged at an angle less than 90 degrees to the rotation axis, and the first impact surface and the second impact surface have the same inclination angle and the same inclination direction.

[0017] In a possible design, there are multiple first matching parts, and the multiple first matching parts are evenly spaced around the rotation axis; the number of the second matching parts is equal to the number of the first matching parts, and the first matching parts and the second matching parts are arranged in a one-to-one correspondence.

[0018] In a possible design, a plurality of the first matching portions are arranged around the periphery of the first impact structure, and a plurality of the second matching portions are arranged around the periphery of the second impact structure.

[0019] In a possible design, the first impact portion is provided with a first guide structure, and the output portion is provided with a second guide structure. The first guide structure and the second guide structure are slidably matched along the extension direction of the rotation axis.

[0020] In a possible design, the elastic part is a spring, the output part is a cylindrical structure, and the spring is sleeved on the output part.

[0021] The composite percussion drill tool provided by the present application has the following advantages: compared with the prior art, in the composite percussion drill tool of the present application, the driving unit drives the output unit to rotate, thereby driving the first percussion unit to rotate. When the rotational resistance of the drill bit on the second percussion unit is relatively low (for example, when the drill bit is drilling soft soil), the first percussion unit can drive the second percussion unit and the drill bit to rotate (this is a pure rotation mode). When the drill bit on the second impact portion encounters a large rotational resistance (for example, when the drill bit is drilling a rock structure), the first mating portion on the first impact portion can move relative to the second mating portion. During the movement of the first mating portion relative to the second mating portion, the first mating portion drives the first impact portion to move away from the second impact portion along the rotation axis, thereby compressing the elastic portion and storing energy. Until the first mating portion passes over the second mating portion, causing the first mating portion and the second mating portion to be offset in the circumferential direction around the rotation axis, the elastic portion releases energy to push the first impact portion toward the second impact portion, thereby causing the first impact portion to strike the second impact portion axially along the rotation axis, causing the drill bit on the second impact portion to perform an axial (longitudinal) impact on the rock under the impact of the first impact portion. After the first mating portion passes over the second mating portion, the first mating portion continues to rotate under the drive of the first impact portion, causing the first mating portion to approach the second mating portion circumferentially around the rotation axis until the first mating portion strikes the second mating portion, causing the drill bit on the second impact portion to perform a circumferential impact on the rock. This is a combined impact mode.

[0022] In summary, the composite percussion drill provided by the present application includes a pure rotation mode and a composite impact mode. In the composite impact mode, axial impact and circumferential impact are performed alternately, which makes it easier to break hard geological structures such as rocks, and is beneficial to improving drilling efficiency. In addition, the composite percussion drill provided by the present application automatically switches to a pure rotation mode or a composite impact mode according to the resistance encountered by the drill bit during the drilling process, so that the composite percussion drill provided by the present application can automatically switch to a suitable drilling mode according to different geological structures using only one drive unit, thereby improving drilling efficiency and reducing production costs. In addition, since the rotation mode and the composite impact mode are performed separately, the vibration amplitude of the drill bit is low during the drilling process, which is beneficial to protecting the drill bit and increasing its service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments or descriptions of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0024] Figure 1This is a schematic structural diagram of a composite percussion drill provided by one embodiment of the present application;

[0025] Figure 2 This is an exploded schematic diagram of parts of a composite percussion drill provided by one embodiment of the present application;

[0026] Figure 3 is a half-section schematic diagram of a composite percussion drill provided by one embodiment of the present application;

[0027] Figure 4 This is a schematic structural diagram of a first impact portion in a composite impact drill provided by an embodiment of the present application;

[0028] Figure 5 This is a schematic structural diagram of the second impact portion of the composite impact drill provided by one embodiment of the present application;

[0029] Figure 6 This is a schematic diagram of a composite percussion drill provided by one embodiment of the present application in a pure rotation mode;

[0030] Figure 7 This is a simulated force analysis diagram of the second matching portion in the composite percussion drill provided in one embodiment of the present application;

[0031] Figure 8 This is a schematic diagram of a composite impact drill provided by an embodiment of the present application in a composite impact mode. Figure 1 ;

[0032] Figure 9 This is a schematic diagram of a composite impact drill provided by an embodiment of the present application in a composite impact mode. Figure 2 ;

[0033] Figure 10 This is a schematic diagram of a composite impact drill provided by an embodiment of the present application in a composite impact mode. Figure 3 ;

[0034] Figure 11 This is a schematic diagram of a composite impact drill provided by an embodiment of the present application in a composite impact mode. Figure 4 ;

[0035] Figure 12 yes Figure 3 A partial enlarged schematic diagram of point A in the middle;

[0036] Figure 13 It is a structural schematic diagram of the driving part and the output part of the composite percussion drill provided in one embodiment of the present application.

[0037] The reference numerals used in the above drawings are as follows:

[0038] 100, housing; 101, inner cavity; 110, sealing cover; 120, main body; 130, connecting plate; 140, bearing; 150, drill pipe connector;

[0039] 210, driving unit; 220, output unit; 221, second guide structure; 222, stopper;

[0040] 300, elastic part;

[0041] 400, first impact portion; 410, first surface; 420, first matching portion; 421, first matching surface; 422, first vertical surface; 423, first transition surface; 430, first impact structure; 431, first impact surface; 440, sliding hole; 441, first guide structure.

[0042] 500, second impact portion; 510, second surface; 520, second matching portion; 521, second matching surface; 522, second vertical surface; 523, second transition surface; 530, second impact structure; 531, second impact surface. DETAILED DESCRIPTION

[0043] In order to make the technical problems, technical solutions and beneficial effects to be solved by this application more clearly understood, this application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0044] It should be noted that when an element is referred to as being “fixed on” or “disposed on” another element, it may be directly on the other element or indirectly on the other element. When an element is referred to as being “connected to” another element, it may be directly connected to the other element or indirectly connected to the other element.

[0045] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the structure or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on this application.

[0046] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. Throughout the description of this application, "plurality" means two or more, unless otherwise specifically defined.

[0047] Finally, it should be noted that in some of the drawings provided in the embodiments of this application ( Figure 6 、 Figure 8 、 Figure 9 、 Figure 10 and Figure 11 ), the dotted arrow indicates the moving direction of the first impact portion and the first matching portion and the first impact structure on the first impact portion.

[0048] In order to illustrate the technical solution described in this application, the following is a detailed description with reference to specific drawings and embodiments.

[0049] like Figures 1 to 3 As shown, one embodiment of the present application provides a composite percussion drill tool, comprising a housing 100, a driving unit 210, an output unit 220, an elastic unit 300, a first impact unit 400, and a second impact unit 500. The housing 100 has an inner cavity 101. The driving unit 210 is in transmission connection with the output unit 220, and is configured to drive the output unit 220 to rotate about a rotation axis L. At least a portion of the output unit 220 extends into the inner cavity 101. The elastic unit 300, the first impact unit 400, and the second impact unit 500 are sequentially arranged in the inner cavity 101 along the direction of the rotation axis L. The first impact unit 400 is slidably mounted on the output unit 220 along the direction of the rotation axis L. The elastic unit 300 is located between the first impact unit 400 and the sidewall of the inner cavity 101. The second impact unit 500 is configured to connect to a drill bit. Alternatively, the driving unit 210 may be a motor or other structure capable of outputting torque.

[0050] like Figure 4 As shown, the first impact portion 400 has a first surface 410 facing the second impact portion 500, and the first surface 410 is protrudingly provided with a first matching portion 420. Figure 5 As shown, the second impact portion 500 has a second surface 510 facing the first impact portion 400. A second mating portion 520 is protruding from the second surface 510. The first mating portion 420 has a first mating surface 421 capable of contacting the second mating portion 520, and the second mating portion 520 has a second mating surface 521 capable of contacting the first mating portion 420. At least one of the first mating surface 421 and the second mating surface 521 is a guide slope, which is inclined relative to the extension direction and circumferential direction of the rotation axis L.

[0051] It will be understood that the guide bevel is arranged at an angle relative to the extension direction and circumferential direction of the rotation axis L. In other words, the guide bevel is arranged at an angle less than 90 degrees with the extension direction and circumferential direction of the rotation axis L. When the first mating portion 420 and the second mating portion 520 move relative to each other, the first mating portion 420 moves along the second mating surface 521 relative to the second mating portion 520, and the second mating portion 520 moves along the first mating surface 421 relative to the first mating portion 420. Because at least one of the first mating surface 421 and the second mating surface 521 is a guide bevel, when the first mating portion 420 and the second mating portion 520 move relative to each other, the first mating portion 420 can drive the first impact portion 400 to move along the extension direction of the rotation axis L, causing the first impact portion 400 to move closer to or farther away from the second impact portion 500 along the extension direction of the rotation axis L.

[0052] In the embodiment of the present application, the first mating surface 421 or the second mating surface 521 is a guide bevel, or the first mating surface 421 and the second mating surface 521 are both guide bevels. Optionally, the first mating surface 421 and the second mating surface 521 are both guide bevels, and the inclination angles of the first mating surface 421 and the second mating surface 521 can be the same or different. In one example, Figure 6 and Figure 7 As shown, the first mating surface 421 and the second mating surface 521 are both guide inclined surfaces, and the first mating surface 421 and the second mating surface 521 are arranged in parallel. For ease of description, the following description is based on the example that the first mating surface 421 and the second mating surface 521 are both guide inclined surfaces and the first mating surface 421 and the second mating surface 521 are arranged in parallel.

[0053] The composite percussion drill tool provided in the embodiments of the present application is suitable for mineral resource exploration, geological surveys, and engineering geological surveys of ground and lunar foundations. Compared to related technologies, the composite percussion drill tool of the embodiments of the present application, by providing an elastic portion 300, a first mating portion 420 on the first impact portion 400, and a second mating portion 520 on the second impact portion 500, with the first mating surface 421 provided on the first mating portion 420 and the second mating surface 521 provided on the second mating portion 520, enables the composite percussion drill tool of the embodiments of the present application to have both a pure rotation mode and a composite percussion mode, and can automatically switch to the appropriate mode according to different geological structures.

[0054] Specifically, when the driving portion 210 drives the output portion 220 to rotate around the rotation axis L, the first impact portion 400 is driven to rotate, thereby causing the first matching portion 420 to rotate around the rotation axis L. Figure 6As shown, during the rotation of the first mating portion 420 around the rotation axis L, the first mating portion 420 approaches the second mating portion 520, so that the first mating portion 420 contacts the second mating surface 521, and the second mating portion 520 contacts the first mating surface 421. Specifically, the first mating surface 421 contacts the second mating surface 521. When the first mating portion 420 continues to rotate, so that the first mating surface 421 has a tendency to move relative to the second mating surface 521, friction is generated between the first mating surface 421 and the second mating surface 521. Figure 7 As shown, Figure 7 To simulate the force analysis of the second mating portion 520, a random point on the second mating surface 521 is selected and analyzed for force at that point. F1 is the pressure exerted on that point by the first mating portion 420, Td / R is the torque transmitted to that point by the driving unit 210 sequentially through the output portion 220, the first impact portion 400, and the first mating portion 420, f is the friction force applied to that point, f1 is the component of the friction force f in the rotational direction of the output portion 220, F2 is the pressure exerted on that point by the first mating surface 421, and θ is the angle between the first mating surface 421 and the second mating surface 521 and the rotational direction of the output portion 220. When the resistance F3 applied to the drill bit is less than the component f1 of the friction force f, the second mating portion 520, driven by the first mating portion 420, can rotate in the rotational direction of the output portion 220, thereby driving the drill bit to rotate. This is the pure rotation mode. It is understood that the resistance F3 experienced by the drill bit is opposite to the direction of its rotation, while the drill bit and the output unit 220 rotate in the same direction. Therefore, the resistance F3 experienced by the drill bit is opposite to the direction of rotation of the output unit 220. The pure rotation mode is suitable for drilling in soft soil structures. Because the soil in soft soil structures is relatively loose, the resistance F3 experienced by the drill bit during drilling is small, the risk of damage to the drill bit is reduced, drilling efficiency is higher, and samples in soft soil structures are less likely to be damaged.

[0055] When the resistance F3 on the drill bit is greater than the component f1 of the friction force f, as Figure 8 and Figure 9 As shown, the first matching portion 420 rotates relative to the second matching portion 520 under the drive of the output portion 220, and under the cooperation between the first matching surface 421 and the second matching surface 521, the first matching portion 420 moves away from the second impact portion 500 during the rotation relative to the second matching portion 520, and the elastic portion 300 is compressed and stores energy, as shown in FIG. Figure 10As shown, until the first matching portion 420 passes over the second matching portion 520, the elastic portion 300 releases energy to push the first impact portion 400 to move toward the second impact portion 500, thereby causing the first impact portion 400 to strike the second impact portion 500 along the axial direction of the rotation axis L, so that the drill bit on the second impact portion 500 is subjected to the impact force from the first impact portion 400 and performs an axial (longitudinal) impact on the rock; when the first matching portion 420 passes over the second matching portion 520, as shown Figure 11 As shown, the first matching portion 420 continues to rotate under the drive of the first impact portion 400, so that the first matching portion 420 approaches the second matching portion 520 in the circumferential direction around the rotation axis L until the first matching portion 420 hits the second matching portion 520, thereby causing the drill bit on the second impact portion 500 to perform a circumferential impact on the rock. This is a composite impact (axial impact and circumferential impact are performed alternately) mode.

[0056] In summary, the composite percussion drill provided in the embodiment of the present application includes a pure rotation mode and a composite impact mode. In the composite impact mode, axial impact and circumferential impact are performed alternately, which makes it easier to break hard geological structures such as rocks, and is beneficial to improving drilling efficiency. In addition, the composite percussion drill provided in the embodiment of the present application automatically switches to a pure rotation mode or a composite impact mode according to the resistance encountered by the drill bit during the drilling process. Different geological structures encounter different resistances, so that the composite percussion drill provided in the embodiment of the present application only uses one drive unit 210 to automatically switch to the appropriate drilling mode according to different geological structures, making drilling efficiency higher and production costs lower. In addition, since the rotation mode and the composite impact mode are performed separately, the vibration amplitude of the drill bit is lower during the drilling process, which is beneficial to protecting the drill bit and increasing its service life. Since the composite percussion drill provided in the embodiment of the present application can adjust the appropriate working mode according to different geological structures, it is beneficial to reduce damage to the sample, improve the integrity of the sample, and make the accuracy of the test results higher.

[0057] In some embodiments, as Figure 2 and Figure 3As shown, the housing 100 includes a connecting plate 130, a sealing cover 110 and a cylindrical main body 120. The axis of the main body 120 coincides with the rotation axis L. The connecting plate 130 covers the opening at one end of the main body 120, and the sealing cover 110 covers the opening at the other end of the main body 120. The connecting plate 130, the housing 100 and the sealing cover 110 enclose an inner cavity 101. The connecting plate 130 and the main body 120 can be connected by welding, clamping, gluing or any other means. For example, the connecting plate 130 and the main body 120 are connected to form an integral structure by integral production molding (such as integral casting molding). The sealing cover 110 and the main body 120 can be connected by clamping, interference fit or any other means. The connecting plate 130 is provided with a first through hole that communicates with the inner cavity 101. One end of the output part 220 extends into the inner cavity 101 through the first through hole and is slidably connected to the first impact part 400. The elastic part 300, the first impact part 400, and the second impact part 500 are sequentially installed in the inner cavity 101 along the extension direction of the rotation axis L. The elastic part 300 is located between the first impact part 400 and the connecting plate 130, and the second impact part 500 is located on the side of the first impact part 400 close to the sealing cover 110. The sealing cover 110 is provided with a second through hole. The end of the second impact part 500 away from the first impact part 400 extends to the outside of the housing 100 through the second through hole to facilitate the connection of the second impact part 500 to the drill bit. The second impact part 500 can be directly connected to the drill bit or indirectly connected to the drill bit. For example, a drill rod connector 150 is provided on the side of the sealing cover 110 facing away from the inner cavity 101. The second impact part 500 is connected to the drill rod connector 150 after passing through the second through hole. The drill rod connector 150 is connected to the drill rod of the drill bit (not shown in the figure).

[0058] In some embodiments, as Figure 2 and Figure 3 As shown, a bearing 140 is also installed in the inner cavity 101. The end of the second impact part 500 facing away from the first impact part 400 passes through the bearing 140 and the second through-hole in sequence to connect to the drill rod connector 150. In one example, the bearing 140 is specifically a dense ball bearing 140. The use of the dense ball bearing 140 can effectively improve the precision and stability of the second impact part 500-driven rotation of the drill bit.

[0059] In the embodiments of this application, Figure 10As shown, when the first impact portion 400 rotates about the rotation axis L driven by the output portion 220, causing the first mating portion 420 to rotate relative to the second mating portion 520 about the rotation axis L and pass over the second mating portion 520, the first mating portion 420 moves from the second mating surface 521 to the other surface of the second mating portion 520 opposite to the second mating surface 521 in the circumferential direction of the rotation axis L. Simultaneously, the second mating portion 520 moves from the first mating surface 421 to the other surface of the first mating portion 420 opposite to the first mating surface 421 in the circumferential direction of the rotation axis L.

[0060] The side surface of the first matching portion 420 opposite to the first matching surface 421 in the circumferential direction around the rotation axis L can be an inclined surface, or can also be a surface parallel to the rotation axis L. Similarly, the side surface of the second matching portion 520 opposite to the second matching surface 521 in the circumferential direction around the rotation axis L can be an inclined surface, or can also be a surface parallel to the rotation axis L. In a possible design, Figure 4 As shown, the first matching portion 420 further has a first vertical surface 422, and the first vertical surface 422 and the first matching surface 421 are respectively located on two opposite sides of the first matching portion 420 in the circumferential direction around the rotation axis L. Figure 5 As shown, the second matching portion 520 further has a second vertical surface 522, and the second vertical surface 522 and the second matching surface 521 are respectively located on opposite sides of the second matching portion 520 in the circumferential direction around the rotation axis L. The first vertical surface 422 and the second vertical surface 522 are both parallel to the rotation axis L. The first vertical surface 422 is arranged perpendicular to the first surface 410, and the second vertical surface 522 is arranged perpendicular to the second surface 510. With such an arrangement, when the first matching portion 420 rotates relative to the second matching portion 520 around the rotation axis L under the drive of the first impact portion 400, as shown in FIG. Figure 10 As shown, until the first vertical surface 422 of the first mating portion 420 is located on the side of the second vertical surface 522 facing away from the second mating portion 520, the first mating portion 420 can be pushed by the elastic portion 300 to quickly move toward the side closer to the second mating portion 520, and the first impact portion 400 can quickly impact the second impact portion 500. This can reduce the resistance encountered by the first impact portion 400 during the impact with the second impact portion 500, thereby increasing the speed at which the first impact portion 400 impacts the second impact portion 500, thereby increasing the impact force experienced by the second impact portion 500 and, in turn, the impact force of the drill bit connected to the second impact portion 500, thereby further improving the drilling rate.

[0061] In one possible design, Figure 4 As shown, the first matching portion 420 further has a first transition surface 423, which extends circumferentially around the rotation axis L and connects the first matching surface 421 and the first vertical surface 422. Figure 5 As shown, the second mating portion 520 further has a second transition surface 523, which extends circumferentially around the rotation axis L and connects the second mating surface 521 and the second vertical surface 522. In this arrangement, the provision of the first transition surface 423 and the second transition surface 523 increases the length of the first mating portion 420 and the second mating portion 520 in the circumferential direction around the rotation axis L, thereby increasing the shear stress resistance of the first mating portion 420 and the second mating portion 520, thereby improving the structural strength of the first mating portion 420 and the second mating portion 520 and enhancing the reliability of the composite percussion drill.

[0062] In some embodiments, the first transition surface 423 and the second transition surface 523 are both arranged at an angle to the rotation axis L. Specifically, the first transition surface 423 and the second transition surface 523 are both arranged perpendicular to the rotation axis L. During the rotation of the first mating portion 420 relative to the second mating portion 520 around the rotation axis L, the first mating portion 420 first moves along the second mating surface 521, so that the first mating portion 420 drives the first impact portion 400 to move along the rotation axis L toward the side close to the connecting plate 130, and the elastic portion 300 is compressed and stores energy; Figure 9 As shown, when the first mating surface 421 moves out of the second mating surface 521, the side of the first transition surface 423 close to the second transition surface 523 contacts the second transition surface 523, and then the first transition surface 423 moves circumferentially around the rotation axis L relative to the second transition surface 523; when the first transition surface 423 moves out of the second transition surface 523, it means that the first mating portion 420 passes over the second mating portion 520. At this time, the first vertical surface 422 is located on the side of the second vertical surface 522 away from the second mating portion 520, and the elastic portion 300 releases energy, pushing the first impact portion 400 to collide with the second impact portion 500 along the extension direction of the rotation axis L.

[0063] Alternatively, as Figure 4 As shown, the first transition surface 423 is smoothly connected with the first mating surface 421 and the first vertical surface 422, that is, the first transition surface 423 and the first mating surface 421 are chamfered, and the first transition surface 423 and the first vertical surface 422 are also chamfered. Figure 5 As shown, the second transition surface 523 and the second mating surface 521 are chamfered, and the second transition surface 523 and the second vertical surface 522 are also chamfered. This reduces stress concentration on the first and second mating portions 420, 520 when the first mating portion 420 rotates relative to the second mating portion 520 about the rotation axis L, thereby improving the structural strength of the first and second mating portions 420, 520.

[0064] Optionally, when the first impact portion 400 approaches the second impact portion 500 along the extension direction of the rotation axis L until it hits the second impact portion 500, the first impact portion 400 can specifically hit the second impact portion 500 by hitting the second surface 510 of the second impact portion 500 through the first matching portion 420. Alternatively, the first surface 410 of the first impact portion 400 hits the second matching portion 520, thereby indirectly hitting the second impact portion 500. Alternatively, in a possible design, as shown in FIG. Figure 4 、 Figure 5 and Figure 12 As shown, the first surface 410 is further provided with a protruding first impact structure 430, and the second surface 510 is further provided with a protruding second impact structure 530. The first impact structure 430 has a first impact surface 431 on the side facing the second impact structure 530, and the second impact structure 530 has a second impact surface 531 on the side facing the first impact structure 430. The first impact surface 431 is configured to abut against the second impact surface 531. When the first impact surface 431 abuts against the second impact surface 531, the first mating portion 420 contacts or is spaced apart from the second surface 510, while the second mating portion 520 contacts or is spaced apart from the first surface 410. This arrangement allows the first impact portion 400 to strike the second impact structure 530 via the first impact structure 430, thereby indirectly striking the second impact portion 500. The first impact structure 430 and the second impact structure 530 bear most or even all of the impact force, effectively reducing the impact force on the first mating portion 420 and the second mating portion 520, thereby protecting the first mating portion 420 and the second mating portion 520.

[0065] In one possible design, the first impact structure 430 and the second impact structure 530 are both annular or cylindrical structures, and the axes of the first impact structure 430 and the second impact structure 530 coincide with the rotation axis L. This arrangement can achieve a more uniform distribution of the interaction force between the first impact structure 430 and the second impact structure 530, i.e., a more uniform force applied to the first impact structure 430 and the second impact structure 530, thereby making the impact force applied to the second impact part 500 more uniform. This can effectively reduce vibration generated by the drill bit on the second impact part 500 and improve the operating stability of the composite impact drill tool.

[0066] In one possible design, Figure 4 、 Figure 5 and Figure 12 As shown, the first impact surface 431 and the second impact surface 531 are both conical surfaces, and the first impact surface 431 and the second impact surface 531 are both arranged around the rotation axis L, and the first impact surface 431 and the second impact surface 531 are both arranged at an angle less than 90 degrees to the rotation axis L, and the first impact surface 431 and the second impact surface 531 have the same inclination angle and the same inclination direction.

[0067] In this embodiment, the first impact structure 430 and the second impact structure 530 can be annular structures, cylindrical structures, or any other arbitrary shapes. In a specific example, the first impact structure 430 is a truncated cone structure, and the side surface of the truncated cone of the first impact structure 430 is the first impact surface 431; the second impact structure 530 is a cylindrical structure, and a conical groove is provided on the side of the second impact structure 530 facing away from the first surface 410, and the sidewall surface of the groove is the second impact surface 531.

[0068] In one specific embodiment, the first impact portion 400 is a cylindrical structure, the axis of the first impact structure 430 coincides with the rotation axis L, one end of the output portion 220 extends into the inner hole of the first impact portion 400 and is slidably connected to the first impact portion 400, and the first surface 410 of the first impact portion 400 is located on the side of the first impact portion 400 facing away from the connecting plate 130. Optionally, a through hole is provided through the first impact structure 430, which is in communication with and coaxially arranged with the inner hole of the first impact portion 400.

[0069] In one possible design, Figure 4 and Figure 5 As shown, there are multiple first mating portions 420, each evenly spaced about the rotation axis L. The number of second mating portions 520 is equal to the number of first mating portions 420, and each of the first mating portions 420 and the second mating portions 520 is arranged in a one-to-one correspondence. This arrangement allows for more uniform force applied to the first impact portion 400 when the multiple first mating portions 420 move relative to the corresponding second mating portions 520, thereby ensuring smoother movement of the first impact portion 400, effectively reducing vibration during operation of the composite impact drill and improving operational stability. Optionally, the multiple first mating portions 420 are arranged around the periphery of the first impact structure 430, and the multiple second mating portions 520 are arranged around the periphery of the second impact structure 530. In one example, there are two first mating portions 420 and two second mating portions 520. The two first mating portions 420 are spaced apart along a first direction perpendicular to the extension of the rotation axis L, and the first impact structure 430 is located between the two first mating portions 420. The two second mating portions 520 are spaced apart along a second direction also perpendicular to the extension of the rotation axis L, and the second impact structure 530 is located between the two second mating portions 520. Optionally, the first and second directions can be the same or different. It is worth noting that when the first mating surface 421 and the second mating surface 521 are arranged opposite each other, the first and second directions form an angle.

[0070] In one possible design, Figure 4 and Figure 13 As shown, the first impact part 400 is provided with a first guide structure 441, and the output part 220 is provided with a second guide structure 221. The first guide structure 441 and the second guide structure 221 slide together along the extension direction of the rotation axis L. The provision of the first guide structure 441 and the second guide structure 221 restricts the first impact part 400 to sliding relative to the output part 220 only along the extension direction of the rotation axis L. In other words, the provision of the first guide structure 441 and the second guide structure not only guides the movement of the first impact part 400 relative to the output part 220, but also limits the relative rotation between the first impact part 400 and the output part 220 about the rotation axis L, allowing the output part 220 to drive the first impact structure 430 to rotate about the rotation axis L, resulting in a simpler structure. In some optional embodiments, one of the first guide structure 441 and the second guide structure 221 is a sliding groove, and the other is a slider. Exemplarily, the first impact part 400 is a cylindrical structure, the inner hole of the first impact part 400 is a sliding hole 440, and a sliding groove (first guide structure 441) is provided on the inner wall of the sliding hole 440 along the extension direction of the rotation axis L. The output part 220 is protruded from one end away from the driving part 210 and is provided with a slider (second guide structure 221) extending along the extension direction of the rotation axis L. The output part 220 extends into the sliding hole 440, and the slider is located in the sliding groove.

[0071] In one possible design, Figure 4 and Figure 13 As shown, there are multiple first guide structures 441 and multiple second guide structures 221. The multiple first guide structures 441 are evenly spaced about the rotation axis L, and the multiple second guide structures 221 are corresponding to the multiple first guide structures 441. Each first guide structure 441 slidably engages with the corresponding second guide structure 221. The multiple first guide structures 441 and multiple second guide structures 221 enhance the assembly stability between the first impact portion 400 and the output portion 220, thereby improving the rotational restraint of the first impact portion 400 relative to the output portion 220 and the guiding effect of the first impact portion 400 sliding relative to the output portion 220 along the direction of the rotation axis L. In one example, the inner wall of the sliding hole 440 is provided with multiple sliding grooves extending along the direction of the rotation axis L, and the multiple sliding grooves are evenly spaced about the rotation axis L. Multiple sliders extending along the direction of the rotation axis L are protruding from the end of the output portion 220 away from the driving portion 210, and the multiple sliders are evenly spaced about the rotation axis L. The plurality of slide grooves are arranged in one-to-one correspondence with the plurality of sliders, and each slider is slidably installed in the corresponding slide groove.

[0072] In some optional embodiments, such as Figure 2 and Figure 3As shown, the elastic portion 300 can be any elastically deformable structure, such as a spring, a disc spring, or a rubber member. In one example, the elastic portion 300 is a spring, the output portion 220 is a cylindrical structure, and the spring is sleeved onto the output portion 220. Springs are relatively inexpensive and easy to manufacture, so using a spring as the elastic portion 300 helps reduce costs and manufacturing difficulty. By sleeved onto the output portion 220, the force exerted by the spring on the first impact portion 400 can be more uniform, improving the smoothness of the first impact portion 400's impact with the second impact portion 500, thereby reducing vibration of the second impact portion 500 and, consequently, vibration of the drill bit. Optionally, the ends of the elastic portion 300 contact the first impact portion 400 and the connecting plate 130, respectively. When the first impact portion 400 moves away from the second impact portion 500 along the extension direction of the rotation axis L, the elastic portion 300 is compressed by the first impact portion 400 and the connecting plate 130, storing energy. Alternatively, a stop plate 222 is installed on the output part 220, and the stop plate 222 and the first impact part 400 are spaced apart in the extension direction of the rotation axis L. The elastic part 300 is located between the stop plate 222 and the first impact part 400, and contacts the first impact part 400 and the stop plate 222 respectively. When the first impact part 400 moves away from the second impact part 500 along the extension direction of the rotation axis L, the elastic part 300 is specifically compressed by the stop plate 222 and the first impact part 400 and stores energy.

[0073] The above description is merely an optional embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present application shall be included in the scope of protection of the present application.

Claims

1. A composite percussion drill, characterized in that: The drill bit comprises a housing, a driving portion, an output portion, an elastic portion, a first impact portion, and a second impact portion. The housing has an inner cavity. The driving portion is in transmission connection with the output portion. The driving portion is used to drive the output portion to rotate around a rotation axis. At least a portion of the output portion extends into the inner cavity. The elastic portion, the first impact portion, and the second impact portion are sequentially arranged in the inner cavity along the extension direction of the rotation axis. The first impact portion is slidably mounted on the output portion along the extension direction of the rotation axis. The elastic portion is located between the first impact portion and a side wall of the inner cavity. The second impact portion is used to connect to a drill bit. The first impact portion has a first surface facing the second impact portion, the first surface being provided with a first mating portion protruding therefrom; the second impact portion has a second surface facing the first impact portion, the second surface being provided with a second mating portion protruding therefrom; the first mating portion has a first mating surface capable of contacting the second mating portion, and the second mating portion has a second mating surface capable of contacting the first mating portion; at least one of the first mating surface and the second mating surface is a guide slope, and the guide slope is arranged obliquely relative to the extension direction and the circumferential direction of the rotation axis; The first mating portion further comprises a first vertical surface, the first vertical surface and the first mating surface being located on opposite sides of the first mating portion in a circumferential direction around the rotation axis; the second mating portion further comprises a second vertical surface, the second vertical surface and the second mating surface being located on opposite sides of the second mating portion in a circumferential direction around the rotation axis; the first vertical surface and the second vertical surface are both parallel to the rotation axis; The first mating portion also has a first transition surface, which extends circumferentially around the rotation axis and connects the first mating surface and the first vertical surface; the second mating portion also has a second transition surface, which extends circumferentially around the rotation axis and connects the second mating surface and the second vertical surface.

2. The composite percussion drill according to claim 1, characterized in that: The first surface is also protrudingly provided with a first impact structure, and the second surface is also protrudingly provided with a second impact structure; the first impact structure has a first impact surface on the side facing the second impact structure, and the second impact structure has a second impact surface on the side facing the first impact structure, and the first impact surface is used to abut against the second impact surface; when the first impact surface abuts against the second impact surface, the first matching portion is in contact with or spaced apart from the second surface, and the second matching portion is in contact with or spaced apart from the first surface.

3. The composite percussion drill according to claim 2, characterized in that: The first impact structure and the second impact structure are both annular structures or cylindrical structures, and the axes of the first impact structure and the second impact structure both coincide with the rotation axis.

4. The composite percussion drill according to claim 2, characterized in that: The first impact surface and the second impact surface are both conical surfaces, and the first impact surface and the second impact surface are both arranged around the rotation axis. The first impact surface and the second impact surface are both arranged at an angle less than 90 degrees to the rotation axis. The first impact surface and the second impact surface have the same inclination angle and the same inclination direction.

5. The composite percussion drill according to any one of claims 2 to 4, characterized in that: There are multiple first matching parts, and the multiple first matching parts are evenly spaced around the rotation axis; the number of the second matching parts is equal to the number of the first matching parts, and the first matching parts and the second matching parts are arranged in a one-to-one correspondence.

6. The composite percussion drill according to claim 5, characterized in that: A plurality of the first matching portions are arranged around the outer periphery of the first impact structure, and a plurality of the second matching portions are arranged around the outer periphery of the second impact structure.

7. The composite percussion drill according to any one of claims 1 to 4, characterized in that: The first impact portion is provided with a first guide structure, and the output portion is provided with a second guide structure. The first guide structure and the second guide structure are slidably matched along the extending direction of the rotation axis.

8. The composite percussion drill according to any one of claims 1 to 4, characterized in that: The elastic part is a spring, the output part is a cylindrical structure, and the spring is sleeved on the output part.

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