Combined type impact drilling tool

Abstract

The invention is suitable for the technical field of drilling tools, and provides a combined type impact drilling tool which comprises a shell, a driving part, an output part, an elastic part, a first impact part and a second impact part. The driving part is used for driving the output part to rotate around the rotating axis, the elastic part, the first impact part and the second impact part are sequentially arranged in an inner cavity of the shell in the extending direction of the rotating axis, and the first impact part is slidably installed 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 is provided with a first matching surface, the second matching part is provided with a second matching surface, and at least one of the first matching surface and the second matching surface is a guide inclined surface. Under the interaction of the first matching part and the second matching part, the composite impact mode and the pure rotation mode can be automatically switched according to the magnitude of resistance borne by a drill bit on the second impact part, so that the drilling efficiency is higher, the production cost is lower, the drill bit can be protected, and the service life is prolonged.

Description

Technical Field

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

[0002] In modern geological exploration and engineering construction, obtaining accurate underground rock samples for testing and analysis is a crucial step. Usually, people mainly use drilling tools to extract underground rock samples. Due to the complex underground geological structure, the drilling tools sometimes encounter soft soil structures and sometimes encounter hard rock structures during the drilling process. Traditional drilling tools usually only support adjusting the drill bit speed, with 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 the drilling efficiency. Although the above-mentioned improved drilling tools have improved the drilling efficiency compared with traditional drilling tools, some of the improved drilling tools driven by a single motor need to be stopped to switch the drilling mode, which is cumbersome to operate and still makes the drilling efficiency low; some of the improved drilling tools driven by a single motor can rotate and impact axially at the same time, but this will cause the drill bit to vibrate with a large amplitude during the drilling process, making the drill bit easy to damage; some of the improved drilling tools driven by dual motors can switch the drilling mode without stopping, but the dual motor drive not only increases the occupied space and weight of the drilling tool, but also makes the production cost higher. Summary of the invention

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

[0005] To achieve the above-mentioned purpose, the technical solution adopted in the present application is: to provide a composite impact drill, comprising a housing, a driving part, an output part, an elastic part, a first impact part and a second impact part, the housing having an inner cavity, the driving part being transmission-connected with the output part, the driving part being used to drive the output part to rotate around a rotation axis, at least a part of the structure of the output part extending into the inner cavity, the elastic part, the first impact part and the second impact part being sequentially arranged in the inner cavity along the extension direction of the rotation axis, the first impact part being slidably mounted on the output part along the extension direction of the rotation axis, the elastic part being located between the first impact part and the side wall of the inner cavity, and the second impact part being used to connect a drill bit;

[0006] The first impact portion has a first surface facing the second impact portion, the first surface is protrudingly provided with a first matching portion, the second impact portion has a second surface facing the first impact portion, 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 the 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 the 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 extends around the circumference of the rotation axis and connects 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 also 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 used 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 axes of the second impact structure both coincide with the rotation axis.

[0016] In a 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 with 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, and 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 impact drill provided by the present application has the following beneficial effects: compared with the prior art, in the composite impact drill provided by the present application, the driving part drives the output part to rotate, thereby driving the first impact part to rotate. When the rotation resistance of the drill bit on the second impact part is small (for example, when the drill bit drills a soft soil structure), the first impact part can drive the second impact part and the drill bit to rotate (this is a pure rotation mode). When the rotational resistance encountered by the drill bit on the second impact part is relatively large (for example, when the drill bit is drilling a rock structure), the first matching part on the first impact part can move relative to the second matching part. During the movement of the first matching part relative to the second matching part, the first matching part drives the first impact part to move along the rotation axis in a direction away from the second impact part, so that the elastic part is compressed and stores energy until the first matching part passes over the second matching part, so that when the first matching part and the second matching part are staggered in the circumferential direction around the rotation axis, the elastic part releases energy to push the first impact part to move in a direction close to the second impact part, thereby causing the first impact part to hit the second impact part axially along the rotation axis, so that the drill bit on the second impact part performs an axial (longitudinal) impact on the rock under the impact of the first impact part; after the first matching part passes over the second matching part, the first matching part continues to rotate driven by the first impact part, so that the first matching part approaches the second matching part in the circumferential direction around the rotation axis until the first matching part hits the second matching part, so that the drill bit on the second impact part performs a circumferential impact on the rock, which is a compound impact mode.

[0022] In summary, the composite impact 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 impact 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 impact drill provided by the present application can automatically switch to a suitable drilling mode according to different geological structures using only one driving unit, so that the drilling efficiency is higher and the production cost is 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. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. 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 paying any creative work.

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

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

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

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

[0028] Figure 5 It is a structural schematic diagram of a second impact part in a composite impact drill provided by an embodiment of the present application;

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

[0030] Figure 7 This is a simulated force analysis diagram of the second matching part in the composite impact drill provided by an 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] Fig. 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] Fig.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] Fig.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] Fig.12 yes Figure 3 A local enlarged schematic diagram of the middle A;

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

[0037] The reference numerals 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 part; 220, output part; 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 the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

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

[0045] It should be understood that the orientation or position relationship indicated by terms such as "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" are based on the orientation or position relationship shown in the drawings and are only for the convenience of describing the present 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 the present application.

[0046] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0047] Finally, it should be noted that some of the drawings provided in the embodiments of the present application ( Figure 6 , Figure 8 , Fig. 9 , Fig.10 and Fig.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, a detailed description is given below in conjunction with specific drawings and embodiments.

[0049] like Figures 1 to 3 As shown, an embodiment of the present application provides a composite impact drill, including a housing 100, a driving part 210, an output part 220, an elastic part 300, a first impact part 400 and a second impact part 500, wherein the housing 100 has an inner cavity 101. The driving part 210 is in transmission connection with the output part 220, and the driving part 210 is used to drive the output part 220 to rotate around the rotation axis L, and at least part of the structure of the output part 220 extends into the inner cavity 101. The elastic part 300, the first impact part 400 and the second impact part 500 are sequentially arranged in the inner cavity 101 along the extension direction of the rotation axis L, the first impact part 400 is slidably installed on the output part 220 along the extension direction of the rotation axis L, the elastic part 300 is located between the first impact part 400 and the side wall of the inner cavity 101, and the second impact part 500 is used to connect the drill bit. Optionally, the driving part 210 can be a motor or other structure that can output 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, and the second surface 510 is protrudingly provided with a second matching portion 520. The first matching portion 420 has a first matching surface 421 that can contact the second matching portion 520, and the second matching portion 520 has a second matching surface 521 that can contact the first matching portion 420. At least one of the first matching surface 421 and the second matching surface 521 is a guide slope, and the guide slope is inclined relative to the extension direction and the circumferential direction of the rotation axis L.

[0051] It can be understood that the guide slope is inclined relative to the extension direction and the circumferential direction of the rotation axis L, that is, the guide slope is set at an angle less than 90 degrees with the extension direction and the circumferential direction of the rotation axis L. When the first matching portion 420 and the second matching portion 520 move relative to each other, the first matching portion 420 moves along the second matching surface 521 relative to the second matching portion 520, and the second matching portion 520 moves along the first matching surface 421 relative to the first matching portion 420. Since at least one of the first matching surface 421 and the second matching surface 521 is a guide slope, when the first matching portion 420 and the second matching portion 520 move relative to each other, the first matching portion 420 can drive the first impact portion 400 to move along the extension direction of the rotation axis L, so that the first impact portion 400 moves closer to or 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 guiding inclined surface, or the first mating surface 421 and the second mating surface 521 are both guiding inclined surfaces. Optionally, the first mating surface 421 and the second mating surface 521 are both guiding inclined surfaces, 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 slopes, 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 slopes, and the first mating surface 421 and the second mating surface 521 are arranged in parallel.

[0053] The composite impact drill provided in the embodiment of the present application is suitable for mineral resource exploration, geological survey and research, and engineering geological survey of foundations and moon bases. Compared with the related art, the composite impact drill in the embodiment of the present application has a pure rotation mode and a composite impact mode, and can automatically switch to a suitable mode according to different geological structures by providing the elastic part 300, the first matching part 420 on the first impact part 400, and the second matching part 520 of the second impact part 500, and the first matching part 420 is provided with a first matching surface 421, and the second matching part 520 is provided with a second matching surface 521.

[0054] Specifically, when the driving part 210 drives the output part 220 to rotate around the rotation axis L, the first impact part 400 is driven to rotate, so that the first matching part 420 rotates 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 diagram of the second mating part 520, specifically, a point is randomly selected on the second mating surface 521, and a force analysis diagram of the point is drawn. Among them, F1 is the pressure exerted on the point by the first mating part 420, Td / R is the torque transmitted to the point by the driving part 210 through the output part 220, the first impact part 400 and the first mating part 420 in sequence, f is the friction force exerted on the point, f1 is the component force of the friction force f in the rotation direction of the output part 220, F2 is the pressure exerted on the 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 rotation direction of the output part 220. When the resistance F3 exerted on the drill bit is less than the component force f1 of the friction force f, the second mating part 520 can rotate along the rotation direction of the output part 220 driven by the first mating part 420, thereby driving the drill bit to rotate, which is a pure rotation mode. It is understandable that the resistance F3 experienced by the drill bit is opposite to the rotation direction of the drill bit, while the drill bit and the output part 220 have the same rotation direction, so the resistance F3 experienced by the drill bit is opposite to the rotation direction of the output part 220. The pure rotation mode is suitable for drilling soft soil structures. Since the soil of soft soil structures is relatively soft, the resistance F3 experienced by the drill bit during drilling is small, the risk of damage to the drill bit is small, the drilling efficiency is higher, and it is not easy to damage the sample in the soft soil structure.

[0055] When the resistance F3 on the drill bit is greater than the component f1 of the friction force f, Figure 8 and Fig. 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 in a direction 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. Fig.10As shown in FIG. 1 , 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 impact 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 in FIG. Fig.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, so that the drill bit on the second impact portion 500 performs 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 impact drill provided by 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 conducive to improving drilling efficiency. In addition, the composite impact drill provided by the embodiment of the present application is automatically switched to a pure rotation mode or a composite impact mode by the resistance size of the drill bit during the drilling process. Different geological structures have different resistances to the drill bit, so that the composite impact drill provided by the embodiment of the present application only uses one drive unit 210 to automatically switch to a suitable drilling mode according to different geological structures, so that the drilling efficiency is higher and the production cost is lower. And because 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 conducive to protecting the drill bit and improving the service life. Since the composite impact drill provided by the embodiment of the present application can adjust the appropriate working mode according to different geological structures, it is conducive to reducing the damage to the sample, improving the integrity of the sample, and making the accuracy of the detection result higher.

[0057] In some embodiments, 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 are arranged to form 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, etc.). 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 connected to the inner cavity 101, and one end of the output part 220 extends into the inner cavity 101 through the first through hole and is slidably connected with 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, and one 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, so that the second impact part 500 is connected to the drill bit. The second impact part 500 can be directly connected to the drill bit or indirectly connected to the drill bit. Exemplarily, a drill rod connector 150 is provided on the side of the sealing cover 110 away from the inner cavity 101, and the second impact part 500 is connected to the drill rod connector 150 after passing through the second through hole, and the drill rod connector 150 is connected to the drill rod of the drill bit (not shown in the figure).

[0058] In some embodiments, Figure 2 and Figure 3 As shown, a bearing 140 is also installed in the inner cavity 101, and the end of the second impact part 500 away from the first impact part 400 passes through the bearing 140 and the second through hole in sequence to be connected to the drill rod connector 150. In an example, the bearing 140 is specifically a dense ball bearing 140, and the use of the dense ball bearing 140 can effectively improve the accuracy of the second impact part 500 driving the drill bit to rotate, and can also effectively improve the stability of the second impact part 500 driving the drill bit to rotate.

[0059] In the embodiments of the present application, Fig.10As shown, when the first impact portion 400 rotates around the rotation axis L driven by the output portion 220, so that the first matching portion 420 rotates around the rotation axis L relative to the second matching portion 520 and passes over the second matching portion 520, in the circumferential direction of the rotation axis L, the first matching portion 420 specifically moves from the second matching surface 521 to the other surface of the second matching portion 520 opposite to the second matching surface 521. At the same time, in the circumferential direction of the rotation axis L, the second matching portion 520 moves from the first matching surface 421 to the other surface of the first matching portion 420 opposite to the first matching surface 421.

[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 may be an inclined surface, or may 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 may be an inclined surface, or may 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 also 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 perpendicularly to the first surface 410, and the second vertical surface 522 is arranged perpendicularly to the second surface 510. In this way, when the first matching portion 420 is driven by the first impact portion 400 to rotate relative to the second matching portion 520 around the rotation axis L, as shown in FIG. Fig.10 As shown, until the first vertical surface 422 of the first matching portion 420 is located at the side of the second vertical surface 522 away from the second matching portion 520, the first matching portion 420 can be pushed by the elastic portion 300 to quickly move to the side close to the second matching portion 520, and the first impact portion 400 can quickly impact the second impact portion 500. In this way, the resistance encountered by the first impact portion 400 in the process of impacting the second impact portion 500 can be reduced, thereby increasing the speed at which the first impact portion 400 impacts the second impact portion 500, thereby increasing the impact force encountered by the second impact portion 500, that is, increasing the impact force of the drill bit connected to the second impact portion 500, which is conducive to further improving the drilling rate.

[0061] In one possible design, Figure 4 As shown, the first matching portion 420 also has a first transition surface 423, which extends around the circumference of the rotation axis L and connects the first matching surface 421 and the first vertical surface 422. Figure 5 As shown, the second matching portion 520 also has a second transition surface 523, which extends in the circumferential direction around the rotation axis L and connects the second matching surface 521 and the second vertical surface 522. In this arrangement, by providing the first transition surface 423 and the second transition surface 523, the length of the first matching portion 420 and the second matching portion 520 in the circumferential direction around the rotation axis L is increased, so as to improve the shear stress resistance of the first matching portion 420 and the second matching portion 520, that is, to improve the structural strength of the first matching portion 420 and the second matching portion 520, and improve the reliability of the composite impact drill.

[0062] In some embodiments, the first transition surface 423 and the second transition surface 523 are both arranged at an angle with 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 matching portion 420 relative to the second matching portion 520 around the rotation axis L, the first matching portion 420 first moves along the second matching surface 521, so that the first matching 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; Fig. 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 to push the first impact portion 400 to collide with the second impact portion 500 along the extension direction of the rotation axis L.

[0063] Alternatively, if 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, a rounded corner is provided between the second transition surface 523 and the second mating surface 521, and a rounded corner is also provided between the second transition surface 523 and the second vertical surface 522. In this way, when the first mating portion 420 rotates relative to the second mating portion 520 around the rotation axis L, the stress concentration of the first mating portion 420 and the second mating portion 520 can be reduced, thereby improving the structural strength of the first mating portion 420 and the second mating portion 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 on 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 Figure 4 , Figure 5 and Fig.12 As shown, the first surface 410 is also provided with a first impact structure 430 protrudingly, and the second surface 510 is also provided with a second impact structure 530 protrudingly; 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, and the first impact surface 431 is used to abut against the second impact surface 531; when the first impact surface 431 abuts against the second impact surface 531, the first matching portion 420 is in contact with or spaced from the second surface 510, and the second matching portion 520 is in contact with or spaced from the first surface 410. In this way, the first impact portion 400 can impact the second impact structure 530 through the first impact structure 430 to indirectly impact the second impact portion 500, and the first impact structure 430 and the second impact structure 530 bear most or even all of the impact force, thereby effectively reducing the impact force on the first matching portion 420 and the second matching portion 520, so as to protect the first matching portion 420 and the second matching portion 520.

[0065] In a possible design, the first impact structure 430 and the second impact structure 530 are both annular structures or cylindrical structures, and the axis of the first impact structure 430 and the axis of the second impact structure 530 both coincide with the rotation axis L. Such an arrangement can make the interaction force between the first impact structure 430 and the second impact structure 530 more evenly distributed, that is, the first impact structure 430 and the second impact structure 530 are subjected to more even forces, so that the impact force on the second impact part 500 is more even, which can effectively reduce the vibration generated by the drill bit on the second impact part 500 and improve the working stability of the composite impact drill.

[0066] In one possible design, Figure 4 , Figure 5 and Fig.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 with 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 may be an annular structure, a cylindrical structure, or any other shaped structure. In a specific example, the first impact structure 430 is a truncated cone structure, and the truncated cone side 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 away from the first surface 410, and the side wall of the groove is the second impact surface 531.

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

[0069] In one possible design, Figure 4 and Figure 5 As shown, there are multiple first matching parts 420, and the multiple first matching parts 420 are evenly spaced around the rotation axis L; the number of second matching parts 520 is equal to the number of first matching parts 420, and the first matching parts 420 and the second matching parts 520 are arranged one by one. In this way, when the multiple first matching parts 420 move relative to the corresponding second matching parts 520, the force on the first impact part 400 can be more uniform, so that the movement of the first impact part 400 is more stable, effectively reducing the vibration of the composite impact drill during operation, and improving the stability during operation. Optionally, the multiple first matching parts 420 are arranged around the periphery of the first impact structure 430, and the multiple second matching parts 520 are arranged around the periphery of the second impact structure 530. In one example, the number of the first matching parts 420 and the number of the second matching parts 520 are both two, the two first matching parts 420 are arranged at intervals along the first direction, the first direction is arranged perpendicular to the extension direction of the rotation axis L, and the first impact structure 430 is located between the two first matching parts 420; the two second matching parts 520 are arranged at intervals along the second direction, the second direction is also arranged perpendicular to the extension direction of the rotation axis L, and the second impact structure 530 is located between the two second matching parts 520. Optionally, the first direction and the second direction can be the same direction or different directions. It is worth noting that when the first matching surface 421 and the second matching surface 521 are arranged opposite to each other, the first direction and the second direction are arranged at an angle.

[0070] In one possible design, Figure 4 and Fig.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, and the first guide structure 441 and the second guide structure 221 are slidably matched along the extension direction of the rotation axis L. By providing the first guide structure 441 and the second guide structure 221, it is limited that the first impact part 400 can only slide relative to the output part 220 along the extension direction of the rotation axis L. In other words, by providing the first guide structure 441 and the second wire structure, it 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 around the rotation axis L, so that the output part 220 can drive the first impact structure 430 to rotate around the rotation axis L, and the structure is simpler. In some optional embodiments, one of the first guide structure 441 and the second guide structure 221 is a slide groove, and the other is a slider. Exemplarily, the first impact portion 400 is a cylindrical structure, the inner hole of the first impact portion 400 is a sliding hole 440, 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, and a slider (second guide structure 221) extending along the extension direction of the rotation axis L is protruded from one end of the output portion 220 away from the driving portion 210, the output portion 220 extends into the sliding hole 440, and the slider is located in the sliding groove.

[0071] In one possible design, Figure 4 and Fig.13 As shown, the number of the first guide structure 441 and the second guide structure 221 are both multiple, the multiple first guide structures 441 are evenly spaced around the rotation axis L, the multiple second guide structures 221 are arranged one by one with the multiple first guide structures 441, and each first guide structure 441 is slidably matched with the corresponding second guide structure 221. By providing multiple first guide structures 441 and multiple second guide structures 221, the assembly stability between the first impact part 400 and the output part 220 is improved, that is, the limiting effect of the first impact part 400 rotating relative to the output part 220 is improved, and the guiding effect of the first impact part 400 sliding relative to the output part 220 along the extension direction of the rotation axis L is improved. In an example, a plurality of slide grooves are provided on the inner wall of the slide hole 440 along the extension direction of the rotation axis L, and the plurality of slide grooves are evenly spaced around the rotation axis L. A plurality of sliders extending along the extension direction of the rotation axis L are protruded from one end of the output part 220 away from the driving part 210, and the plurality of sliders are evenly spaced around 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 part 300 can be any structure with elastic deformation ability such as a spring, a disc spring or a rubber part. In one example, the elastic part 300 is a spring, the output part 220 is a cylindrical structure, and the spring is sleeved on the output part 220. The cost of the spring is low and it is easy to make. Using a spring as the elastic part 300 is conducive to reducing the cost and difficulty of making. By sleeved the spring on the output part 220, the force from the spring on the first impact part 400 can be made more uniform, and the stability when the first impact part 400 hits the second impact part 500 can be improved to reduce the vibration of the second impact part 500, thereby reducing the vibration of the drill bit. Optionally, the two ends of the elastic part 300 are in contact with the first impact part 400 and the connecting plate 130 respectively. When the first impact part 400 is away from the second impact part 500 along the extension direction of the rotation axis L, the elastic part 300 is compressed by the first impact part 400 and the connecting plate 130 and stores 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 is in contact with 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 only 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 should be included in the protection scope of the present application.

Claims

1. A composite impact drill, characterized in that: The invention comprises a housing, a driving part, an output part, an elastic part, a first impact part and a second impact part, wherein the housing has an inner cavity, the driving part is drivingly connected with the output part, the driving part is used to drive the output part to rotate around a rotation axis, at least part of the structure of the output part extends into the inner cavity, the elastic part, the first impact part and the second impact part are sequentially arranged in the inner cavity along the extension direction of the rotation axis, the first impact part is slidably installed on the output part along the extension direction of the rotation axis, the elastic part is located between the first impact part and the side wall of the inner cavity, and the second impact part is used to connect a drill bit; The first impact portion has a first surface facing the second impact portion, the first surface is protrudingly provided with a first matching portion, the second impact portion has a second surface facing the first impact portion, 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 the circumferential direction of the rotation axis.

2. The composite impact drill according to claim 1, characterized in that: 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 the circumferential direction around the rotation axis; 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; The first vertical plane and the second vertical plane are both parallel to the rotation axis.

3. The composite impact drill according to claim 2, characterized in that: The first matching portion further has a first transition surface, which extends circumferentially around the rotation axis and connects the first matching surface and the first vertical surface; The second matching portion further has a second transition surface, which extends circumferentially around the rotation axis and connects the second matching surface and the second vertical surface.

4. The composite impact 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.

5. The composite impact drill according to claim 4, 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 axes of the second impact structure coincide with the rotation axis.

6. The composite impact drill according to claim 4, characterized in that: 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 with the rotation axis, and the first impact surface and the second impact surface have the same inclination angle and the same inclination direction.

7. The composite impact drill according to any one of claims 4 to 6, 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.

8. The composite impact drill according to claim 7, 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.

9. The composite impact drill according to any one of claims 1 to 6, 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.

10. The composite impact drill according to any one of claims 1 to 6, 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.

Images