A compact electric rock drill device

Abstract

The application relates to a compact electric rock drill device in the technical field of electric rock drills, which comprises an arm, the front of the arm is provided with a rock drilling assembly capable of being arranged along the length direction of the arm and a driving assembly for driving the rock drilling assembly to walk; the rock drilling assembly comprises: a machine body which is slidably connected to the front of the arm along the length direction; and an impact piece, a piston of the impact piece being slidably connected to the front section of the inner cavity of the machine body; the driving motor and the speed reducer of the application not only drive the rock drilling assembly to move forward and backward, but also drive the cam to periodically contact and push the impact piece forward; compared with the existing electric rock drill, the axial space of the machine body is greatly compressed, high-intensity impact is realized in the limited volume, the contradiction between light weight and impact force is solved, and the driving motor which is the main heat source is arranged below the machine body, so that a larger heat dissipation space is provided.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electric rock drills, in particular to a compact electric rock drill device. BACKGROUND

[0002] The existing electric rock drill (usually refers to the rock drill driven by the electric motor) has significant advantages in energy efficiency and environmental protection compared with the traditional pneumatic rock drill and hydraulic rock drill, but still faces some key technical defects and bottlenecks. For example, the impact mechanism, the structure driven by the linear motor or rotary motor, is difficult to achieve high-strength impact in limited space. That is, if the impact force is increased, the mass and volume need to be increased, which is contrary to the design of lightweight and miniaturization. If the design of lightweight and miniaturization, it is difficult to increase the high-strength impact, and the heat dissipation space of the linear motor or rotary motor also needs to be compressed. For another example, when encountering a rock layer with high hardness, the machine body such as steel drill may cause rapid retreat under the rock reaction force, which has certain safety hazards, and even damage to the equipment.

[0003] Although the hydraulic rock drill with a retreat prevention mechanism disclosed in the Chinese authorized patent with publication number CN110924857B and the hydraulic rock drill disclosed in the Chinese authorized patent with publication number CN114086880B both disclose a retreat prevention mechanism, which specifically includes a retreat prevention strip, a retreat prevention block, a spring for pressing the retreat prevention block to adhere to the retreat prevention strip, and a guide structure. The retreat prevention mechanism can well prevent the machine body from retreating. However, the existence of the retreat prevention mechanism leads to the situation that the machine body cannot retreat, and human intervention is needed when the machine body retreats.

[0004] Therefore, we designed a compact electric rock drill device which is beneficial to heat dissipation. SUMMARY

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

[0006] To achieve the above-mentioned purpose, the present application adopts the following technical scheme:

[0007] A compact electric rock drill device, comprising a machine arm, wherein the front surface of the machine arm is provided with 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;

[0008] The rock drilling assembly comprises:

[0009] A machine body is slidably connected to the front surface of the machine arm along the length direction;

[0010] An impact piece, whose piston is slidably connected to the front section of the inner cavity of the machine body;

[0011] a cam, vertically connected to the inner cavity of the machine body and located behind the impactor, for periodically contacting and pushing the impactor forward;

[0012] a first spring, arranged in the inner cavity of the machine body and located in front of the piston of the impactor, for preventing the piston of the impactor from directly impacting the front end of the machine body;

[0013] a second spring, arranged in the inner cavity of the machine body and located behind the piston of the impactor, for absorbing the recoil kinetic energy of the impactor and limiting the stroke of the backward movement of the impactor;

[0014] wherein the first spring and the second spring cooperate to make the impactor stably stay in a position where the cam cannot contact, so that the impactor can be periodically contacted and pushed forward by the cam after the impactor moves backward after contacting the rock stratum;

[0015] the driving assembly comprises:

[0016] a driving motor;

[0017] a speed reducer, installed between the machine body and the driving motor, with a first output shaft connected to the cam shaft through a shaft coupling, and a second output shaft connected to the rack on the machine arm through a gear, for driving the rock drilling assembly to walk and drive the cam to rotate through the shaft coupling.

[0018] Further, the rack is slidingly connected to the inner side wall of the machine arm, and a buffer is arranged between one end of the rack and the machine arm, so as to absorb the rock reaction force during rock drilling and prevent the rack and the gear teeth from breaking.

[0019] Further, the buffer comprises:

[0020] a box body, fixedly installed at one end of the machine arm;

[0021] a buffer plate, movably installed in the box body and connected to the end of the rack through a sliding plate;

[0022] a buffer spring, having two groups, arranged between the two plate surfaces of the buffer plate and the corresponding inner end surfaces of the box body.

[0023] Further, the shaft coupling is a ratchet one-way transmission coupling.

[0024] Further, the shaft coupling comprises:

[0025] an inner ring, coaxially sleeved on the first output shaft of the speed reducer or the cam shaft; the outer surface of the inner ring is provided with a ring of ratchet teeth;

[0026] an outer ring, coaxially sleeved on the cam shaft or the first output shaft of the speed reducer and located outside the inner ring;

[0027] A pawl is rotatably connected to one end of the outer ring;

[0028] A third spring is arranged on the inner side of the pawl to facilitate the outward rotation of the pawl and the disengagement of the pawl from the ratchet teeth;

[0029] A floating block is radially arranged in the outer ring and corresponds to the pawl;

[0030] A sliding sleeve is arranged in the outer ring, and the inner surface of the sliding sleeve is in abutting engagement with the outer end surface of the floating block through a slope;

[0031] A connecting rod is hingedly connected between the sliding sleeve and the impact element, and when the impact element moves away after abutting against the rock stratum, the sliding sleeve is driven to move downward, so that the floating block pushes the pawl to rotate inward and engages with the ratchet teeth;

[0032] The bottom of the machine body is provided with a notch for the extension of the connecting rod, and the notch is provided with a flexible sealing element.

[0033] Further, the protruding end of the cam is connected with a rotating wheel through a pin shaft.

[0034] Further, the two inner side walls of the machine arm are each provided with the rack, and the speed reducer has two symmetrically arranged second output shafts, and the two second output shafts are in transmission cooperation with the racks on the same side through gears.

[0035] Further, a retreat stopping assembly is further arranged between the second output shaft of the speed reducer and the machine arm to prevent the rock reaction force from causing the machine body to quickly retreat and the driving assembly to be damaged.

[0036] Further, the retreat stopping assembly comprises:

[0037] A retreat stopping rack is arranged on the inner side of the machine arm along the length direction;

[0038] A retreat stopping wheel is rotatably arranged on the second output shaft of the speed reducer, and a circumferential radial mounting groove is arranged on the flange surface of the retreat stopping wheel along the circumferential direction;

[0039] An elastic column is arranged in the radial mounting groove, and the central axis of the elastic column is parallel to the central line of the retreat stopping wheel;

[0040] A centrifugal clamping column is arranged in the radial mounting groove and sleeved on the column body of the elastic column, and when the rock reaction force causes the machine body to quickly retreat, the second output shaft of the speed reducer drives the retreat stopping wheel to quickly rotate under the action of the rack, so that the centrifugal clamping column overcomes the pulling of the elastic column and clamps into the retreat stopping rack to prevent the retreat.

[0041] Further, two linear slide rail pairs are symmetrically arranged on the front surface of the machine arm, and the machine body and the speed reducer are fixedly connected with the sliding parts of the linear slide rail pairs.

[0042] Compared with the prior art, the beneficial effects of the present application are:

[0043] 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.

[0044] 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.

[0045] 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.

[0046] 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;

[0047] 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

[0048] Figure 1 It is a structural schematic diagram of the present invention;

[0049] Figure 2 A top view of the present invention;

[0050] Figure 3 for Figure 2 AA cross-sectional view;

[0051] Figure 4 for Figure 3 BB cross-sectional view;

[0052] Figure 5 for Figure 3 I local enlarged view;

[0053] Figure 6Fig. 1 is an axial sectional view of the coupling in the present application;

[0054] Figure 7 Fig. 2 is a radial sectional view of the coupling in the present application;

[0055] Figure 8 Fig. 3 is a radial sectional view of the stop rack and the stop wheel in the present application.

[0056] Fig. 1 is an axial sectional view of the coupling in the present application; DETAILED DESCRIPTION

[0057] The present application can be explained in detail by the following examples, the purpose of the present application is to protect all technical improvements within the scope of the present application, in the description of the present application, it is understood that if there are terms "up", "down", "front", "back", "left", "right" and the like indicate the orientation or position relationship, only the corresponding to the drawings of the present application, in order to facilitate the description of the present application; it is understood that if there are terms "end", "side", "end", "side", "transverse", "longitudinal" and the like indicate the orientation or position relationship, only the corresponding to the length and width of the corresponding parts, that is, "end" indicates the head and tail area of the length direction of the corresponding parts, "side" indicates the head and tail area of the width direction of the corresponding parts; in order to facilitate the description of the present application and not indicate or imply that the device or element must have a particular orientation.

[0058] Example 1, in conjunction with the drawings Figures 1-3 A compact structure electric rock drill device, comprising:

[0059] Arm 1: as the main support frame, the front surface is symmetrically provided with two linear slide pairs 8, and the inner side wall is provided with a rack 4.

[0060] Rock drilling assembly 2: slidingly connected to the front surface of arm 1, comprising:

[0061] Body 21: slidingly mounted on the two linear slide pairs 8.

[0062] Impact element 22: the piston is slidingly arranged in the front section of the inner cavity of body 21, and the front end is connected with a steel drill in use, which is used for impacting the rock stratum.

[0063] Cam 23: vertically rotatingly connected to the rear section of the inner cavity of the body 21, and the protruding end is installed with a rotating wheel 231 through a pin shaft.

[0064] In a possible implementation, the cam 23 is triangular in structure, and each corner end is installed with a rotating wheel 231 through a pin shaft. That is, when the cam 23 rotates, the rotating wheel 231 at the corner end periodically contacts and pushes the impact piece 22 forward.

[0065] First spring 24: provided in front of the piston of the impact piece 22, to prevent the piston from directly impacting the front end of the body 21. That is, when the hardness of the rock layer is relatively small, after the cam 23 contacts and pushes the impact piece 22 forward, the rock layer is broken in a large depth, at which time the first spring 24 can be used to block and prevent the piston of the impact piece 22 from impacting the front end of the body 21.

[0066] Second spring 25: provided in the inner cavity of the body 21 and located behind the piston of the impact piece 22, to absorb the recoil kinetic energy of the impact piece 22 and limit the stroke of the backward movement of the impact piece 22.

[0067] Specifically, the inner cavity of the body 21 is provided with a limiting ring in the position interval in the direction of the piston of the impact piece 22, and the second spring 25 is arranged between the limiting ring and the piston of the impact piece 22.

[0068] Spring cooperation: the first spring 24 and the second spring 25 cooperate to make the impact piece 22 stably stay in a position where the cam 23 cannot contact; when the impact piece 22 moves backward after abutting against the rock layer, it can be pushed back by the cam 23.

[0069] Driving assembly 3: located below the rear end of the rock drilling assembly 2, that is, inside the rock drilling assembly 2. It includes:

[0070] Driving motor 31: provides a power source.

[0071] Speed reducer 32: fixed to the rear part of the body 21, and its first output shaft is connected to the wheel shaft of the cam 23 through a shaft coupling; the second output shaft is engaged with the rack 4 of the arm 1 through a gear, to drive the rock drilling assembly 2 to walk. Specifically, the input shaft of the speed reducer 32 is connected to the output shaft of the driving motor 31 through a shaft coupling.

[0072] Further, to ensure the force balance of the driving assembly 3 and the rock drilling assembly 2, the two inner side walls of the arm 1 are each provided with a rack 4, that is, the two racks 4 are symmetrically arranged. The speed reducer 32 has two symmetrically arranged second output shafts, and the two second output shafts are respectively in transmission cooperation with the racks 4 on the same side through gears. Specifically, the two second output shafts have the same rotating speed but opposite rotating directions.

[0073] According to needs, the two gears on the two second output shafts can be engaged with each other.

[0074] When the steel drill bit at the front end of the impact element 22 does not contact the rock, the driving motor 31 drives the speed reducer 32 to rotate, at this time the first output shaft of the speed reducer 32 drives the cam 23 to rotate (cannot contact the impact element 22), at this time the second output shaft of the speed reducer 32 drives the gear to rotate, the gear moves forward under the action of the rack 4, at this time the driving assembly 3 and the rock drilling assembly 2 move forward synchronously, until the steel drill bit at the front end of the impact element 22 contacts the rock and moves backward; however, the driving assembly 3 and the rock drilling assembly 2 continue to move forward, the cam 23 begins to periodically contact and push the impact element 22 forward, and the impact element 22 drives the steel drill bit at the front end to perform the rock drilling operation.

[0075] In the second embodiment, the cam 23 is connected to the driving assembly 3 through the coupling 5, and the coupling 5 is a one-way transmission coupling. Figures 1-3 In the second embodiment, the cam 23 is connected to the driving assembly 3 through the coupling 5, and the coupling 5 is a one-way transmission coupling.

[0076] Further, in order to further reduce the energy consumption caused by the rotation of the cam 23, the coupling 5 is provided with a trigger structure. Specifically, when the steel drill bit at the front end of the impact element 22 does not contact the rock, the trigger structure is in an open state, and even if the driving motor 31 drives the rock drilling assembly 2 and the driving assembly 3 to move forward, the coupling 5 cannot drive the cam 23 to rotate.

[0077] In a possible implementation, the coupling 5 includes:

[0078] The inner ring 51 is provided with a row of ratchet teeth 511 on the outer surface.

[0079] The outer ring 52 is provided with a key groove or spline on the outer periphery of the inner ring 51.

[0080] Specifically, the upper segment of the outer ring 52 is provided with a key groove or spline on the axle of the cam 23, and the lower segment extends to the outer periphery of the inner ring 51. According to the needs, the lower end surface of the outer ring 52 can also be provided with a cover plate to reduce the entry of dust.

[0081] The pawl 53 is rotatably connected to the inner side of the outer ring 52 through a pin.

[0082] The third spring 54 is in contact with the inner side surface of the pawl 53, and is used to outwardly press the pawl 53 so that the pawl 53 is in contact with the outer ring 52 and separated from the ratchet teeth 511.

[0083] The floating block 55 is radially penetrated into the outer ring 52 at the inner end and corresponds to the pawl 53;

[0084] According to the requirement, the inner end of the floating block 55 can be a circular end or can be embedded with a ball.

[0085] The sliding sleeve 56 is arranged in the outer ring 52, and the inner surface of the sliding sleeve 56 is in abutting fit with the outer end surface of the floating block 55 through the inclined surface;

[0086] According to the requirement, the two ends of the sliding sleeve 56 can be sealed with the outer ring 52 through the spring rubber sleeve to prevent the fit surface of the sliding sleeve 56 and the outer ring 52 from being polluted by dust. Specifically, one end of the spring rubber sleeve is sealingly connected with the sliding sleeve 56, and the other end is sealingly connected with the outer ring 52.

[0087] The connecting rod 57 is hingedly connected between the sliding sleeve 56 and the impact piece 22. When the impact piece 22 moves backward after abutting against the rock stratum, the sliding sleeve 56 is driven to move downward, so that the floating block 55 pushes the pawl 53 to rotate inward and cooperate with the ratchet teeth 511.

[0088] According to the requirement, the connecting rod 57 can be a rigid rod or an elastic rod capable of being elastically bent.

[0089] The bottom of the machine body 21 is provided with a notch for the connecting rod 57 to extend into, and the notch is provided with a flexible sealing member.

[0090] In this way, when the steel drill installed at the front end of the impact piece 22 does not contact the rock, the piston of the impact piece 22 is pressed by the second spring 25 and moves backward under the reaction of the rock. At this time, the connecting rod 57 is turned over, the lower segment of the connecting rod 57 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 turn over inward and cooperate with the ratchet teeth 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 periodically contact and push the impact piece 22 forward, so that the impact piece 22 drives the steel drill installed at the front end to perform the rock drilling operation.

[0091] It needs to be mainly noted that when the piston of the impact piece 22 is impacted by the cam 23 to move forward, the sliding sleeve 56 can be driven to move upward through the connecting rod 57, and the floating block 55 is reset under the action of the 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 abut against the pawl 53, and the pawl 53 needs to overcome the pressing force of the third spring 54 and the centrifugal force to not turn over outward. For example, as shown in Figure 7The pawl 53 is flipped outward from the position of engaging with the ratchet 511, and the inner ring 51 is required to rotate counterclockwise. However, the inner ring 51 is in a clockwise rotation state due to the driving of the driving motor 31 during the rock drilling process, so the flipping of the pawl 53 is limited, and the pawl 53 will not be disengaged from the ratchet 511 during the rock drilling process.

[0092] In other embodiments, the inner ring 51 can also be installed on the cam 23 axle through a keyway or spline, and the outer ring 52 is installed on the first output shaft of the speed reducer 32 through a keyway or spline.

[0093] In other embodiments, the pawl 53 end pin shaft can be integrated with the third spring 54 into a whole structure (pin shaft spring).

[0094] Example Three, combined with the attached Figures 1-3 A compact electric rock drill device, in order to prevent the teeth of the gear and rack 4 from breaking, the installation of the rack 4 is optimized based on example one or two:

[0095] The rack 4 is slidingly connected to the inner wall of the arm 1 along the length direction, and a buffer 6 is arranged between one end of the rack 4 and the arm 1, which can reduce the impact on the gear and rack 4 under the rock reaction force by moving the rack 4 backward and absorbing energy by the buffer 6, and ensure that the teeth of the gear and rack 4 will not be broken.

[0096] In a possible embodiment, the buffer 6 includes:

[0097] The box 61 is fixedly installed on one end of the arm 1;

[0098] The buffer plate 62 is movably installed on the box 61 and connected to the end of the rack 4 through the sliding plate 63;

[0099] The buffer spring 64 has two groups, which are arranged between the two plate surfaces of the buffer plate 62 and the corresponding inner end surfaces of the box 61.

[0100] Example Four, combined with the attached Figures 1-3A compact electric rock drill device, due to the rock reaction force in embodiment one, the steel drill body 21 retreats quickly, which causes safety hazards, and even the drive motor 31 is damaged (when the drive motor 31 is damaged, the rock drilling assembly 2 and the drive assembly 3 will quickly and greatly retreat, which has a large safety hazard). Based on embodiments one, two or three: a retreat stop assembly 7 is further provided between the second output shaft of the speed reducer 32 and the arm 1, to prevent the rock reaction force from causing the body 21 to quickly retreat, and the drive assembly 3 from being damaged.

[0101] Although the two devices in the background art have a retreat stop function, manual intervention is required to separate them in order to make the rock drilling assembly 2 retreat. This embodiment has been redesigned:

[0102] The retreat stop assembly 7 includes:

[0103] The retreat stop rack 71 is provided on the inner side of the arm 1 along the length direction;

[0104] The retreat stop wheel 72 is rotatably provided on the second output shaft of the speed reducer 32; the wheel rim surface of the retreat stop wheel 72 is provided with a circle of radial installation grooves 721 along the circumferential direction;

[0105] The elastic column 73 is provided in the radial installation groove 721, and the center axis is parallel to the center line of the retreat stop wheel 72;

[0106] The centrifugal clamping column 74 is provided in the radial installation groove 721 and is sleeved on the column body of the elastic column 73; when the rock reaction force causes the body 21 to quickly retreat, the second output shaft of the speed reducer 32 drives the retreat stop wheel 72 to quickly rotate under the action of the rack 4, so that the centrifugal clamping column 74 overcomes the pulling of the elastic column 73 and clamps into the retreat stop rack 71 to prevent it from retreating.

[0107] It should be noted that when the drive motor 31 drives the rock drilling assembly 2 to normally move forward and retreat at a slow speed not greater than 1 m / min, the centrifugal clamping column 74 needs to be ensured not to extend out of the radial installation groove 721 under the pulling of the elastic column 73. However, when drilling, if the hardness of the rock layer is large, the retreat speed of the steel drill body 21 under the rock reaction force is generally greater than 1 m / min, at which time the centrifugal clamping column 74 needs to be ensured to extend out of the radial installation groove 721 and cooperate with the retreat stop rack 71 by overcoming the pulling of the elastic column 73. According to the need, the moving speed of the rock drilling assembly 2 can be taken as 1 m / min as the dividing line for design. That is, when the moving speed of the rock drilling assembly 2 is less than 1 m / min, the centrifugal clamping column 74 is always located in the radial installation groove 721; when the moving speed of the rock drilling assembly 2 is greater than 1 m / min, the outside of the centrifugal clamping column 74 starts to extend out of the radial installation groove 721.

[0108] According to the need, the elastic column 73 can be an elastic pull rope or a spring, which is not specifically limited here.

[0109] The parts of the application not described in detail are part of the state of the art, and it is apparent to a person skilled in the art that the application is not limited to the details of the above-described exemplary embodiments, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of the application; therefore, the above-described embodiments should be considered in any respect as exemplary and non-limiting, and the scope of the application is defined by the attached claims and not by the above description, and it is intended to encompass all variations falling within the meaning and scope of the equivalent elements of the claims, and no figure reference in the claims should be considered 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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