Electric rock drill device with compact structure

Abstract

The invention relates to an electric rock drill device with a compact structure in the technical field of electric rock drills, which comprises a machine arm, and a rock drilling assembly capable of being arranged along the length direction of the machine arm and a driving assembly for driving the rock drilling assembly to walk are arranged on the front side of the machine arm; the rock drilling assembly comprises a machine body slidably connected to the front face of the machine arm in the length direction; a piston of the impact part is slidably connected to the front section of the inner cavity of the machine body; the driving motor and the speed reducer not only drive the rock drilling assembly to move forwards and backwards, but also drive the cam to periodically make contact with and push the impact part forwards, compared with an electric rock drill in the prior art, the axial space of a machine body is greatly compressed, high-strength impact is achieved within the limited size, the contradiction between light weight and impact force is solved, and the impact force is reduced. And the driving motor serving as a main heating part is positioned below the machine body, so that a larger heat dissipation space is provided.

Description

Technical Field

[0001] The present invention relates to the technical field of electric rock drills, and in particular to an electric rock drill device with a compact structure. Background Art

[0002] While existing electric rock drills (typically those using an electric motor to drive the impact mechanism) offer significant advantages over traditional pneumatic and hydraulic rock drills in terms of energy efficiency and environmental friendliness, they still face key technical drawbacks and bottlenecks. For example, they face significant challenges in terms of size and weight. In particular, the impact mechanism, driven by either a linear or rotary motor, struggles to achieve high-intensity impact within a limited space. Increasing impact force requires increasing mass and volume, which conflicts with lightweight and miniaturized designs. Furthermore, achieving lightweight and miniaturized designs hinders achieving high impact force and reduces the heat dissipation space available for the linear or rotary motor. Furthermore, when encountering hard rock layers, the rock reaction force can cause the drill and other components to rapidly retreat, posing safety risks and potentially even damaging the equipment.

[0003] Although the existing Chinese authorized patent with publication number CN110924857B discloses a hydraulic rock drill with a backstop mechanism, and the Chinese authorized patent with publication number CN114086880B discloses a hydraulic rock drill, both of which disclose a backstop mechanism, specifically including a backstop bar, a backstop block, a spring for squeezing the backstop block to make it fit the backstop bar, and a guide structure, the backstop mechanism can effectively prevent the machine body from retreating; however, the existence of the backstop mechanism makes it impossible for the machine body to retreat, and human intervention is required when the machine body retreats.

[0004] Therefore, we designed an electric rock drill device with a compact structure and good heat dissipation. Summary of the Invention

[0005] In order to overcome the deficiencies in the background technology, the present invention discloses a compact electric rock drill device.

[0006] To achieve the above object, the present invention adopts the following technical solutions: A compact electric rock drill device includes a machine arm, a rock drilling assembly that can be arranged along the length direction of the machine arm, and a drive assembly for driving the rock drilling assembly to move; The rock drilling assembly comprises: The machine body is slidably connected to the front of the machine arm along the length direction; An impact member, the piston of which is slidably connected to the front section of the body cavity; a cam, vertically rotatably connected to the inner cavity of the machine body and located behind the impact piece, for periodically contacting and pushing the impact piece forward; a first spring disposed in the inner cavity of the body and in front of the piston of the impact member, for preventing the piston of the impact member from directly impacting the front end of the body; A second spring is provided in the inner cavity of the body and is located behind the piston of the impact member, and is used to absorb the recoil energy of the impact member and limit the backward movement of the impact member; The first spring cooperates with the second spring to keep the impact piece stably in a position where the cam cannot contact it, so that after the impact piece contacts the rock formation and moves backward, it can be periodically contacted and pushed forward by the cam; The drive assembly includes: Drive motor; The reducer is installed between the machine body and the drive motor, and its first output shaft is connected to the cam wheel shaft through a coupling; its second output shaft is connected to the rack on the machine arm through a gear, and is used to drive the rock drilling assembly to move and drive the cam to rotate through the coupling.

[0007] Furthermore, the rack is slidably connected to the inner wall of the arm along the length direction, and a buffer is provided between one end of the rack and the arm to absorb the reaction force of the rock during rock drilling and prevent the teeth of the rack and gear from breaking.

[0008] Furthermore, the buffer member includes: A box body is fixedly mounted on one end of the machine arm; a buffer plate, movably mounted on the box body and connected to the end of the rack via a sliding plate; There are two groups of buffer springs, which are respectively arranged between the two plate surfaces of the buffer plate and the corresponding inner end surfaces of the box.

[0009] Furthermore, the coupling is a ratchet one-way transmission coupling.

[0010] Furthermore, the coupling comprises: The inner ring is coaxially sleeved on the first output shaft of the reducer or the cam shaft; the outer surface of the inner ring is provided with a circle of ratchet teeth; The outer ring is coaxially sleeved on the cam shaft or the first output shaft of the reducer and is located outside the inner ring; a pawl, one end of which is rotatably connected to the inner side of the outer ring; a third spring abutting against the inner side of the pawl to facilitate the pawl to rotate outward and separate from the ratchet teeth; The floating block has an inner end radially extending through the outer ring and corresponding to the pawl; A sliding sleeve, which is arranged on the outer ring and has an inner surface that contacts with the outer end surface of the floating block through an inclined surface; The connecting rod is hinged between the sliding sleeve and the impact member. When the impact member moves backward against the rock layer, it drives the sliding sleeve downward, causing the floating block to push the pawl inward to rotate and engage with the ratchet. Wherein, a notch is provided at the bottom of the machine body for the connecting rod to extend into, and a flexible sealing member is provided in the notch.

[0011] Furthermore, the protruding end of the cam is connected to a rotating wheel via a pin shaft.

[0012] Furthermore, the racks are provided on both inner side walls of the machine arm, and the reducer has two symmetrically arranged second output shafts, which are respectively coupled with the racks on the same side through gears.

[0013] Furthermore, a stop assembly is provided between the second output shaft of the reducer and the machine arm to prevent the reaction force of the rock from causing the machine body to retreat rapidly and the drive assembly to be damaged.

[0014] Furthermore, the anti-retraction component includes: A stop ratchet bar is provided on the inner side of the arm along the length direction; A stop wheel is rotatably sleeved on the second output shaft of the reducer; a rim surface of the stop wheel is provided with a circle of radial mounting grooves along its circumference; An elastic column is arranged in the radial installation groove, and its central axis is parallel to the center line of the anti-retraction wheel; The centrifugal clamping column is arranged in the radial mounting groove and is sleeved on the elastic column body. When the reaction force of the rock causes the machine body to retreat rapidly, the second output shaft of the reducer drives the anti-retraction wheel to rotate rapidly under the action of the rack, so that the centrifugal clamping column overcomes the traction of the elastic column and is clamped into the anti-retraction ratchet to prevent it from retreating.

[0015] Furthermore, two linear slide rail pairs are symmetrically provided on the front of the machine arm, and the machine body and the reducer are fixedly connected to the sliding parts of the linear slide rail pairs.

[0016] Compared with the prior art, the present invention has the following beneficial effects: 1. The drive motor and reducer not only drive the rock drilling assembly forward and backward, but also drive the cam to periodically contact and push the impact member forward. Compared with existing electric rock drills, this significantly compresses the axial space of the machine body, achieving high-intensity impact within a limited volume, resolving the contradiction between lightweight and impact force. In addition, the drive motor, which is the main heat generator, is located below the machine body, providing more space for heat dissipation. 2. The first and second springs in the rock drilling assembly work together to keep the impact piece in a stable standby position where it cannot be contacted by the cam. The cam periodically pushes the impact piece back to its original position only when the impact piece contacts the rock formation and moves backward. This significantly compresses the axial space of the drilling body and prevents the impact piece from running idle when the rock drilling assembly is traveling without load. 3. The innovative design of the ratchet one-way coupling ensures that the pawl engages with the ratchet teeth through the connecting rod, driving the cam only when the impact member moves backward relative to the drill body (i.e., the drill bit contacts the rock formation). At the same time, a third spring built into the coupling ensures that the transmission is only triggered during the drilling phase, avoiding ineffective wear. In other words, when the drilling assembly is traveling without load, the cam disengages from the transmission, eliminating idling energy consumption. 4. The rack is slidably connected to the machine arm, and the energy absorption design of the end through the buffer (buffer plate, sliding plate and bidirectional buffer spring) effectively prevents the teeth of the gear and rack from breaking, thereby extending the life of the transmission system; 5. The design of the centrifugal anti-retraction assembly is that only under the reaction force of the rock, the centrifugal force when the anti-retraction wheel rotates at high speed drives the centrifugal clamping column to overcome the tension of the elastic column and clamp into the anti-retraction ratchet bar; that is, it is automatically triggered only when the body retreats abnormally, solving the problem that traditional anti-retraction mechanisms require human intervention. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the present invention; Figure 2 A top view of the present invention; Figure 3 for Figure 2 AA cross-sectional view; Figure 4 for Figure 3 BB cross-sectional view; Figure 5 for Figure 3 I local enlarged view; Figure 6 is an axial cross-sectional view of the coupling in the present invention; Figure 7 1 is a radial cross-section of the coupling of the present invention; Figure 8 It is a radial cross-sectional view of the anti-retraction ratchet bar and the anti-retraction wheel in the present invention.

[0018] In the figure: 1. Machine arm; 2. Rock drilling assembly; 21. Machine body; 22. Impact member; 23. Cam; 231. Rotating wheel; 24. First spring; 25. Second spring; 3. Driving assembly; 31. Driving motor; 32. Reducer; 4. Rack; 5. Coupling; 51. Inner ring; 511. Ratchet; 52. Outer ring; 53. Pawl; 54. Third spring; 55. Floating block; 56. Sliding sleeve; 57. Connecting rod; 6. Buffer; 61. Box; 62. Buffer plate; 63. Sliding plate; 64. Buffer spring; 7. Back-stop assembly; 71. Back-stop ratchet bar; 72. Back-stop wheel; 721. Radial mounting groove; 73. Elastic column; 74. Centrifugal clamping column; 8. Linear slide pair. DETAILED DESCRIPTION

[0019] The present invention can be explained in detail through the following embodiments. The purpose of disclosing the present invention is to protect all technical improvements within the scope of the present invention. In the description of the present invention, it should be understood that if there are terms such as "upper", "lower", "front", "back", "left", "right" and the like to indicate directions or positional relationships, they only correspond to the drawings of the present application and are for the convenience of describing the present invention. It should be understood that if there are terms such as "end", "side", "end portion", "lateral", "transverse", "longitudinal" and the like to indicate directions or positional relationships, they only correspond to the length and width of the corresponding components, that is, "end portion" indicates the head and tail areas in the length direction of the corresponding component, and "side portion" indicates the head and tail areas in the width direction of the corresponding component. This is for the convenience of describing the present invention and does not indicate or imply that the device or component referred to must have a specific direction.

[0020] Example 1, combined with the attached Figure 1-3 , a compact electric rock drill device, comprising: Arm 1: As the main support frame, two linear slide rail pairs 8 are symmetrically provided on its front side, and a rack 4 is installed on the inner wall.

[0021] Rock drilling assembly 2: Slidingly connected to the front of the machine arm 1, it includes: The machine body 21 is a sliding part mounted on two linear guide rail pairs 8 .

[0022] Impact member 22: Its piston is slidably arranged in the front section of the inner cavity of the body 21. When in use, the front end is connected to the steel drill to impact the rock formation.

[0023] Cam 23: vertically rotatably connected to the rear section of the inner cavity of the body 21, and the protruding end is mounted with a rotating wheel 231 through a pin.

[0024] In one possible embodiment, the cam 23 is a triangular structure, and each corner end is mounted with a rotating wheel 231 via a pin. That is, when the cam 23 rotates, the rotating wheel 231 at the corner end periodically contacts and pushes the impact member 22 forward.

[0025] First spring 24: Located in front of the piston of impact member 22, it prevents the piston from directly striking the front end of the body 21. Specifically, when the rock layer is relatively hard, after cam 23 contacts and pushes impact member 22 forward, the rock layer may be crushed to a great depth. At this time, the first spring 24 can block the impact member 22 piston from striking the front end of the body 21.

[0026] The second spring 25 is provided in the inner cavity of the body 21 and is located behind the piston of the impact member 22 , and is used to absorb the recoil energy of the impact member 22 and limit the backward movement of the impact member 22 .

[0027] Specifically, a limiting ring is provided at a position in the inner cavity of the body 21 in the direction of the piston of the impact member 22 , and the second spring 25 is provided between the limiting ring and the piston of the impact member 22 .

[0028] The springs work together: the first spring 24 cooperates with the second spring 25 to stabilize the impact member 22 in a position where the cam 23 cannot contact it; when the impact member 22 contacts the rock formation and moves back, it can be pushed back by the cam 23.

[0029] Drive assembly 3: Located below the rear end of the rock drilling assembly 2, i.e. inside the rock drilling assembly 2. It includes: Driving motor 31: provides power source.

[0030] Reducer 32 is fixed to the rear of the machine body 21. Its first output shaft is connected to the cam 23 axle via a coupling 5. Its second output shaft engages the rack 4 of the arm 1 via a gear, driving the rock drilling assembly 2. Specifically, the input shaft of reducer 32 is connected to the output shaft of the drive motor 31 via a coupling.

[0031] Furthermore, to ensure force balance between the drive assembly 3 and the rock drilling assembly 2, racks 4 are provided on both inner sidewalls of the arm 1, i.e., the two racks 4 are symmetrically arranged. The reducer 32 has two symmetrically arranged second output shafts, each of which is coupled to the rack 4 on the same side via a gear. Specifically, the two second output shafts rotate at the same speed but in opposite directions.

[0032] As required, the two gears on the two second output shafts can mesh with each other.

[0033] During use, before the steel drill installed at the front end of the impact piece 22 contacts the rock, the drive motor 31 drives the reducer 32 to operate. At this time, the first output shaft of the reducer 32 drives the cam 23 to idle (unable to contact the impact piece 22) through the coupling 5. At this time, the second output shaft of the reducer 32 drives the gear to rotate, and the gear moves forward under the action of the rack 4. At this time, the drive assembly 3 and the rock drilling assembly 2 move forward synchronously until the steel drill installed at the front end of the impact piece 22 contacts the rock and moves backward; however, the drive assembly 3 and the rock drilling assembly 2 continue to move forward, and the cam 23 begins to periodically contact and push the impact piece 22 forward, and the impact piece 2 drives the steel drill installed at the front end to perform rock drilling operations.

[0034] Example 2, combined with the attached Figure 1-3 A compact electric rock drill device is disclosed. In the first embodiment, the cam 23 is constantly rotating when the rock drilling assembly 2 and drive assembly 3 are moving forward and backward. In particular, when the impact member 22 is not operating, the cam 23 is idle. To reduce energy consumption caused by the idling of the cam 23, this embodiment differs from the first embodiment in that the coupling 5 utilizes a ratchet one-way drive coupling. This means that the coupling 5 can only drive the cam 23 to rotate when the drive motor 31 is driving the rock drilling assembly 2 and drive assembly 3 forward.

[0035] Furthermore, to further reduce energy consumption caused by idling of the cam 23, the coupling 5 is equipped with a trigger mechanism. Specifically, when the steel drill mounted at the front end of the impact member 22 does not contact the rock, the trigger mechanism is in the active state. Even if the drive motor 31 drives the rock drilling assembly 2 and the drive assembly 3 forward, the coupling 5 cannot drive the cam 23 to rotate.

[0036] In a possible embodiment, the coupling 5 includes: The inner ring 51 is keyway or spline mounted on the first output shaft of the reducer 32 ; a circle of ratchet teeth 511 is provided on the outer surface of the inner ring 51 .

[0037] The outer ring 52 is keyed or splined to the cam 23 axle and is located outside the inner ring 51; Specifically, the keyway or spline on the upper section of the outer ring 52 is mounted on the cam 23 axle, and the lower section extends to the periphery of the inner ring 51. As needed, a cover plate can also be provided on the lower end surface of the outer ring 52 to reduce dust entry.

[0038] One end of the pawl 53 is rotatably connected to the inner side of the outer ring 52 through a pin.

[0039] The third spring 54 abuts against the inner side surface of the pawl 53 and is used to press the pawl 53 outward so that the pawl 53 abuts against the outer ring 52 and separates from the ratchet teeth 511 .

[0040] The inner end of the floating block 55 radially penetrates the outer ring 52 and corresponds to the pawl 53; As required, the inner end of the floating block 55 may be a round end or may have a ball embedded therein.

[0041] The sliding sleeve 56 is provided on the outer ring 52, and its inner surface is in contact with the outer end surface of the floating block 55 through an inclined surface; As needed, both ends of the sliding sleeve 56 can be sealed with the outer ring 52 by a spring rubber sleeve to prevent dust from contaminating the mating surface between the sliding sleeve 56 and the outer ring 52. Specifically, one end of the spring rubber sleeve is sealed with the sliding sleeve 56, and the other end is sealed with the outer ring 52.

[0042] The connecting rod 57 is hinged between the sliding sleeve 56 and the impact member 22. When the impact member 22 moves backward against the rock formation, the sliding sleeve 56 is driven downward, causing the floating block 55 to push the pawl 53 inward to rotate and engage with the ratchet 511. As required, the connecting rod 57 can be a rigid rod or an elastic rod that can be elastically bent.

[0043] A notch is provided at the bottom of the body 21 for the connecting rod 57 to extend into, and a flexible sealing member is provided in the notch.

[0044] With this arrangement, when the steel drill installed at the front end of the impact member 22 does not contact the rock, under the reaction of the rock, the piston of the impact member 22 squeezes the second spring 25 and moves backward. At this time, the connecting rod 57 flips over, and its lower section moves downward and pushes the sliding sleeve 56 to move downward. At this time, under the action of the inclined surface, the floating block 55 moves axially inward and pushes the pawl 53 to flip inward and cooperate with the ratchet 511. At this time, the rotation of the inner ring 51 can also drive the pawl 53 and the outer ring 52 to rotate, thereby driving the cam 23 to rotate, and begins to periodically contact and push the impact member 22 forward. The impact member 22 drives the steel drill installed at the front end to perform rock drilling operations.

[0045] It is important to note that when the piston of the impact member 22 is impacted by the cam 23 and moves forward, although the sliding sleeve 56 can be driven upward by the connecting rod 57, the floating block 55 is reset under the action of centrifugal force and no longer presses the pawl 53. At this time, due to the rotation of the inner ring 51, the ratchet teeth 511 tightly contact the pawl 53. At this time, the pawl 53 needs to overcome the squeezing force of the third spring 54 and the centrifugal force to avoid turning outward. For example, Figure 7 The structure and position relationship between the pawl 53 and the ratchet 511 requires the inner ring 51 to rotate counterclockwise for the pawl 53 to flip outward from the position where it cooperates with the ratchet 511. However, during the rock drilling process, the driving motor 31 drives the inner ring 51 to rotate clockwise, thereby restricting the pawl 53 from flipping outward. Therefore, during the rock drilling process, the pawl 53 will not be out of the cooperation state with the ratchet 511.

[0046] In other embodiments, the inner ring 51 may be mounted on the cam 23 axle via a keyway or a spline, and the outer ring 52 may be mounted on the first output shaft of the reducer 32 via a keyway or a spline.

[0047] In other embodiments, the pin at one end of the pawl 53 and the third spring 54 may be integrated into an integral structure (pin spring).

[0048] Example 3, combined with the attached Figure 1-3 A compact electric rock drill device is provided. In the first embodiment, due to the influence of the rock reaction force during the rock drilling process, although the second spring 25 can absorb part of the energy, the gear and rack 4 are still subjected to a large impact. To prevent the gear and rack 4 from breaking, the installation of the rack 4 is optimized based on the first or second embodiment. The rack 4 is connected to the inner wall of the arm 1 in a sliding manner along the length direction, and a buffer 6 is provided between one end of the rack 4 and the arm 1. That is, under the reaction force of the rock, the rack 4 can move backward and the buffer 6 can absorb the energy, thereby reducing the impact on the gear and rack 4 and ensuring that the teeth of the gear and rack 4 will not break.

[0049] In a possible implementation, the buffer member 6 includes: The box 61 is fixedly mounted on one end of the arm 1; The buffer plate 62 is movably mounted on the box body 61 and connected to the end of the rack 4 through the sliding plate 63; There are two groups of buffer springs 64 , which are respectively disposed between the two plate surfaces of the buffer plate 62 and the corresponding inner end surfaces of the box body 61 .

[0050] Example 4, combined with the attached Figure 1-3 A compact electric rock drill device is disclosed. In the first embodiment, the rock reaction force can cause the drill assembly 21 and other components to rapidly retreat, potentially posing a safety hazard and even damaging the drive motor 31. (When the drive motor 31 is damaged, the rock drill assembly 2 and drive assembly 3 will rapidly and significantly retreat, posing a significant safety hazard.) This embodiment, in addition to the first, second, or third embodiments, further includes a stop assembly 7 between the second output shaft of the speed reducer 32 and the rock drill arm 1 to prevent the rock reaction force from causing the rock drill assembly 21 to rapidly retreat and damaging the drive assembly 3.

[0051] Although both devices in the background art have a stop function, they require human intervention to separate them in order to allow the rock drilling assembly 2 to retreat. This embodiment has been redesigned: The anti-retraction component 7 includes: The anti-retraction ratchet bar 71 is provided on the inner side of the arm 1 along the length direction; The backstop wheel 72 is rotatably mounted on the second output shaft of the reducer 32; the rim surface of the backstop wheel 72 is provided with a circle of radial mounting grooves 721 along its circumference; The elastic column 73 is disposed in the radial mounting groove 721, and its central axis is parallel to the center line of the retaining wheel 72; The centrifugal clamping column 74 is arranged in the radial mounting groove 721 and is sleeved on the column body of the elastic column 73. When the reaction force of the rock causes the machine body 21 to retreat quickly, the second output shaft of the reducer 32 drives the anti-retraction wheel 72 to rotate quickly under the action of the rack 4, so that the centrifugal clamping column 74 overcomes the elastic column 73 and is pulled into the anti-retraction ratchet 71 to prevent it from retreating.

[0052] It should be noted that when the drive motor 31 drives the rock drill assembly 2 forward and backward normally at a relatively slow speed, typically no greater than 1 m / min, it is necessary to ensure that the centrifugal column 74 does not extend out of the radial mounting slot 721 due to the pull of the elastic column 73. However, during drilling, if the rock drill assembly 2 encounters a harder rock formation, the drill body 21 may retreat at a speed significantly greater than 1 m / min due to the rock's reaction force. In this case, it is necessary to ensure that the centrifugal column 74 can overcome the pull of the elastic column 73, extend out of the radial mounting slot 721, and engage with the retaining ratchet bar 71. As needed, the design can be based on a rock drill assembly 2 speed of 1 m / min. Specifically, when the rock drill assembly 2 moves at a speed less than 1 m / min, the centrifugal column 74 remains within the radial mounting slot 721. When the rock drill assembly 2 moves at a speed greater than 1 m / min, the outer side of the centrifugal column 74 begins to extend out of the radial mounting slot 721.

[0053] As needed, the elastic column 73 can be an elastic pull rope or a spring, which is not specifically limited here.

[0054] The parts of the present invention that are not described in detail are prior art. It is obvious to those skilled in the art that the present invention is not limited to the details of the above-mentioned exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, no matter from which point of view, the above-mentioned embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is limited by the appended claims rather than the above description. Therefore, it is intended that all changes that fall within the meaning and scope of the equivalent elements of the claims are included in the present invention, and any figure marks in the claims should not be regarded as limiting the content of the claims involved.

Claims

1. A compact electric rock drill device, comprising a machine arm (1), wherein the front of the machine arm (1) is provided with a rock drilling assembly (2) that can be arranged along the length direction of the machine arm (1) and a drive assembly (3) for driving the rock drilling assembly (2) to move, characterized in that: The rock drilling assembly (2) comprises: The machine body (21) is slidably connected to the front of the machine arm (1) along the length direction; An impact member (22), a piston of which is slidably connected to the front section of the inner cavity of the body (21); A cam (23) is vertically rotatably connected to the inner cavity of the body (21) and is located behind the impact member (22) for periodically contacting and pushing the impact member (22) forward; A first spring (24) is provided in the inner cavity of the body (21) and is located in front of the piston of the impact member (22), and is used to prevent the piston of the impact member (22) from directly impacting the front end of the body (21); A second spring (25) is provided in the inner cavity of the body (21) and is located behind the piston of the impact member (22), and is used to absorb the recoil energy of the impact member (22) and limit the backward movement of the impact member (22); The first spring (24) cooperates with the second spring (25) to stably position the impact member (22) in a position where the cam (23) cannot contact the impact member (22), so that the impact member (22) can be periodically contacted and pushed forward by the cam (23) after it contacts the rock formation and moves backward; The driving assembly (3) comprises: Drive motor (31); A reducer (32) is installed between the machine body (21) and the drive motor (31), wherein a first output shaft thereof is connected to the wheel shaft of the cam (23) via a coupling (5); and a second output shaft thereof is connected to the rack (4) on the machine arm (1) via a gear, and is used to drive the rock drilling assembly (2) to move and drive the cam (23) to rotate via the coupling (5).

2. A compact electric rock drill device according to claim 1, characterized in that: The rack (4) is slidably connected to the inner wall of the machine arm (1) along the length direction, and a buffer (6) is provided between one end of the rack (4) and the machine arm (1) to absorb the reaction force of the rock during rock drilling and prevent the teeth of the rack (4) and the gear from breaking.

3. A compact electric rock drill device according to claim 2, characterized in that: The buffer member (6) comprises: A box (61) is fixedly mounted on one end of the machine arm (1); A buffer plate (62) is movably mounted on the box body (61) and connected to the end of the rack (4) via a sliding plate (63); The buffer springs (64) have two groups and are respectively arranged between the two plate surfaces of the buffer plate (62) and the corresponding inner end surfaces of the box body (61).

4. A compact electric rock drill device according to claim 1, characterized in that: The coupling (5) is a ratchet one-way transmission coupling.

5. A compact electric rock drill device according to claim 4, characterized in that: The coupling (5) comprises: The inner ring (51) is coaxially sleeved on the first output shaft of the reducer (32) or the cam (23) wheel shaft; the outer surface of the inner ring (51) is provided with a circle of ratchet teeth (511); An outer ring (52) is coaxially sleeved on the cam (23) wheel shaft or the first output shaft of the reducer (32), and is located outside the inner ring (51); A pawl (53), one end of which is rotatably connected to the inner side of the outer ring (52); A third spring (54) contacts the inner side of the pawl (53) to facilitate the pawl (53) to rotate outward and separate from the ratchet (511); A floating block (55), the inner end of which radially penetrates the outer ring (52) and corresponds to the pawl (53); A sliding sleeve (56), the sliding sleeve being arranged on the outer ring (52), wherein the inner surface of the sliding sleeve is in contact with the outer end surface of the floating block (55) via an inclined surface; The connecting rod (57) is hinged between the sliding sleeve (56) and the impact member (22). When the impact member (22) contacts the rock layer and moves backward, the sliding sleeve (56) is driven downward, so that the floating block (55) pushes the ratchet (53) inward to rotate and cooperate with the ratchet (511). A notch is provided at the bottom of the machine body (21) for the connecting rod (57) to extend into, and a flexible sealing member is provided in the notch.

6. The compact electric rock drill device according to claim 1, characterized in that: The protruding end of the cam (23) is connected to a rotating wheel (231) via a pin shaft.

7. The compact electric rock drill device according to claim 1, characterized in that: The racks (4) are provided on both inner side walls of the machine arm (1), and the reducer (32) has two symmetrically arranged second output shafts, which are respectively coupled to the racks (4) on the same side through gears.

8. A compact electric rock drill device according to claim 1 or 7, characterized in that: A stop assembly (7) is also provided between the second output shaft of the speed reducer (32) and the machine arm (1) to prevent the machine body (21) from rapidly retreating due to the reaction force of the rock and to prevent the drive assembly (3) from being damaged.

9. The compact electric rock drill device according to claim 8, characterized in that: The anti-retraction component (7) comprises: A stop ratchet bar (71) is provided on the inner side of the machine arm (1) along the length direction; A stop wheel (72) is rotatably sleeved on the second output shaft of the reducer (32); a rim surface of the stop wheel (72) is provided with a circle of radial mounting grooves (721) along its circumference; An elastic column (73) is disposed in the radial mounting groove (721), and its central axis is parallel to the central center line of the stop wheel (72); The centrifugal clamping column (74) is arranged in the radial mounting groove (721) and is sleeved on the column body of the elastic column (73). When the reaction force of the rock causes the machine body (21) to retreat rapidly, the second output shaft of the reducer (32) drives the anti-retraction wheel (72) to rotate rapidly under the action of the rack (4), so that the centrifugal clamping column (74) overcomes the elastic column (73) and is pulled into the anti-retraction ratchet (71) to prevent it from retreating.

10. The compact electric rock drill device according to claim 1, characterized in that: Two linear slide rail pairs (8) are symmetrically provided on the front of the machine arm (1), and the machine body (21) and the reducer (32) are fixedly connected to the sliding parts of the linear slide rail pairs (8).

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