Tension crack rock breaking mining machine and method of construction

Abstract

The application provides a rock breaking mining machine and a construction method. The mining machine comprises a left cutting part, a left traction part, a middle box, a right traction part and a right cutting part. The cutting part of the rock breaking mining machine is specially designed. A cutting box is additionally arranged at the front end of each of left and right rocker arms. A cutting head capable of rotating is arranged around the cutting box. When the mining machine works, a motor drives the cutting box to revolve as a whole. The cutting head is synchronously driven to rotate by a bevel gear. The rotating direction of the cutting head is opposite to the revolving direction of the cutting box. Finally, the mining machine is controlled to walk and cut, so that the rock is broken.

Description

Technical Field

[0001] This invention belongs to the field of mining equipment technology, specifically relating to a rock-breaking mining machine and its construction method. Background Technology

[0002] Under various geological conditions, coal and rock are very hard and tough. Most medium and small mines often abandon complex and hard coal and rock layers during the mining process. In large-scale mechanized mines, due to the hard coal and rock interbedded with rock, traditional mining machines cannot achieve effective rock breaking and mining capabilities during cutting, resulting in low efficiency and frequent mining machine failures, which greatly affects the mining operation. Summary of the Invention

[0003] The purpose of this invention is to provide a rock-breaking mining machine and its construction method. The cutting section is designed with a cutting box added to the front end of each of the left and right rocker arms. Each cutting box has eight rotating cutting heads arranged circumferentially. During operation, the electric motor drives the entire cutting box to revolve, while the rotating cutting heads rotate synchronously via bevel gear transmission. The rotation direction of the rotating cutting heads is opposite to the revolve direction of the cutting box. Finally, the mining machine is controlled to move and cut, achieving rock-breaking through tensile fracture, thereby improving rock-breaking efficiency. The technical solution adopted by this invention is as follows:

[0004] A rock-breaking mining machine includes: a cutting section, wherein the cutting section comprises:

[0005] The cutting box, comprising a primary planetary mechanism, a secondary planetary mechanism, and a cutting box body, enables the cutting head and the cutting box body to rotate synchronously but in opposite directions to achieve tensile rock breaking, wherein:

[0006] Both the primary planetary mechanism and the secondary planetary mechanism are housed within the cutting box.

[0007] The inner ring of the second-level sun gear of the second-level planetary mechanism is connected to the outer wall of the first-level planet carrier of the first-level planetary mechanism by a key;

[0008] All the secondary planetary shafts of the secondary planetary mechanism are rotatably mounted on the cutting box body, and their ends are respectively fixed to a first spiral bevel gear. Each first spiral bevel gear meshes with a second spiral bevel gear to drive the second spiral bevel gear to rotate.

[0009] Among them, a portion of the secondary planetary shafts, at the end furthest from the first spiral bevel gear, extends and passes through the secondary planetary gear on it, meshing with the secondary internal gear ring of the secondary planetary mechanism; the outer edge of the secondary internal gear ring is fixed to the inner wall of the cutting box body;

[0010] The cutting head unit includes a plurality of cutting heads and a plurality of second spiral bevel gears, wherein the cutting heads and the second spiral bevel gears are arranged correspondingly;

[0011] The axle of each of the second spiral bevel gears is arranged to rotate radially along the second-stage sun gear;

[0012] One of the cutting heads is fixed to the end of the axle of a second spiral bevel gear via a connecting disc, so that the cutting head rotates with its corresponding second spiral bevel gear.

[0013] Preferably, it further includes a rocker arm for driving the cutting head to swing, on which a gear shaft assembly is disposed, the input end of the gear shaft assembly cooperating with the output shaft of the electric motor, and the output end of the gear shaft assembly cooperating with the first-stage sun gear shaft of the first-stage planetary mechanism; the electric motor is used to provide power to drive the first-stage planetary mechanism.

[0014] Preferably, it also includes an internal spray system 1-4 for delivering water mist to the cutting head for cooling and dust suppression, which includes:

[0015] A spray nozzle with a connecting channel;

[0016] The water inlet pipe 1-4-4 is connected to the connecting channel, and a static sealing ring 1-4-3 is provided between it and the inner wall of the connecting channel;

[0017] The central channel 1-4-1 is opened inside the first-stage sun gear shaft. One end of it is connected to the connecting channel, and the other end is connected to the water supply pipe 1-4-5. The water supply pipe 1-4-5 connects the second spiral bevel gear and the gap between the gear shaft of the second spiral bevel gear.

[0018] Rotary sealing ring 1-4-2 is installed between the spray seat and the first-stage sun gear shaft.

[0019] Preferably, a plurality of coal scraping spiral blades 1-3 are provided on the outer wall of the cutting box body. The coal scraping spiral blades 1-3 scrape the cut coal and rock onto the scraper conveyor 4, and the rock-breaking mining machine is placed on the scraper conveyor 4.

[0020] Preferably, the cutting portion includes a left cutting portion 1 and a right cutting portion 6;

[0021] The left cutting section 1 is hinged to the left traction section 2, and the right cutting section 6 is hinged to the right traction section 5; an intermediate box 3 is provided between the left traction section 2 and the right traction section 5.

[0022] Preferably, during operation, the centerline of the cutting head is parallel to the coal face for cutting.

[0023] A rock-breaking construction method using tensile fracture techniques includes the following steps:

[0024] When the motor starts, the gear shaft assembly on the rocker arm drives the first-stage sun gear shaft of the first-stage planetary mechanism to rotate. The first-stage sun gear shaft drives the planet carrier of the first-stage planetary mechanism to rotate. The planet carrier of the first-stage planetary mechanism drives the second-stage sun gear of the second-stage planetary mechanism to rotate. The second-stage sun gear drives the second-stage planetary gear to rotate. The second-stage planetary gear meshes with the second-stage internal gear ring, and the second-stage internal gear ring drives the cutting box to rotate.

[0025] At the same time, the first spiral bevel gear at the end of the planetary shaft of the secondary planetary mechanism drives the second spiral bevel gear to rotate, the second spiral bevel gear drives its axle to rotate together, and the connecting disc on the axle of the second spiral bevel gear drives the cutting head to rotate.

[0026] Compared with the prior art, the advantages of the present invention are:

[0027] (1) When the mining machine is working, the electric motor drives the entire cutting box to revolve around the central axis, and the cutting head rotates synchronously through the bevel gear transmission. The direction of rotation of the cutting head is opposite to the direction of revolution of the cutting box, which facilitates cutting into the rock. Finally, the mining machine is controlled to move and perform tensile cutting to achieve tensile rock breaking. The tensile rock breaking method has low power consumption and can directly cut strong rocks. Traditional methods require various pretreatment work to cut rocks with high uniaxial compressive strength. Therefore, the tensile rock breaking method has higher efficiency, thus improving the rock breaking efficiency.

[0028] Specifically, when the motor starts, the gear shaft assembly on the rocker arm drives the first-stage sun gear shaft of the first-stage planetary mechanism to rotate. The first-stage sun gear shaft drives the planet carrier of the first-stage planetary mechanism to rotate. The planet carrier of the first-stage planetary mechanism drives the second-stage sun gear of the second-stage planetary mechanism to rotate. The second-stage sun gear drives the second-stage planetary gear to rotate. The second-stage planetary gear meshes with the second-stage internal gear ring, which drives the cutting box to rotate. Simultaneously, the first spiral bevel gear at the end of the planet shaft of the second-stage planetary mechanism drives the second spiral bevel gear to rotate. The second spiral bevel gear drives its axle to rotate together, and the connecting disc on the axle of the second spiral bevel gear drives the cutting head to rotate.

[0029] (2) The rock-breaking mining machine has the ability to cut hard coal and rock. The power consumption of the rock-breaking method is 0.1 to 0.2 times that of the traditional compression coal breaking method. It can cut rocks with a uniaxial compressive strength of more than 120 MPa, which is not possible with traditional methods. Therefore, it greatly improves the rock-breaking ability and increases the mining efficiency of hard coal and rock. It realizes the full exploitation and utilization of coal resources, improves the recovery rate of mineral resources, avoids mining machine failures when cutting hard coal seams, saves maintenance costs, and ensures the continuity of the mining process, thereby greatly improving economic benefits. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of a rock-breaking mining machine.

[0031] Figure 2 Left-side cut-off section structural diagram;

[0032] Figure 3 This is a full sectional view of the left section;

[0033] Figure 4 This is a full sectional view of the left-handed cutting box;

[0034] Figure 5 A full sectional view of the right-handed cutting head;

[0035] Figure 6 This is a full sectional view of the internal spray system;

[0036] Figure 7 This is a schematic diagram of a second-stage planetary axis;

[0037] Figure 8 This is a schematic diagram of a mining section.

[0038] Among them, 1-left cutting section; 2-left traction section; 3-intermediate box; 4-scraper conveyor; 5-right traction section; 6-right cutting section; 1-1-right-hand rotary cutting head; 1-1-1-second spiral bevel gear; 1-2-left-hand rotary cutting box; 1-2-1-first-stage planetary mechanism; 1-2-1-first-stage sun gear shaft; 1-2-2-second-stage planetary mechanism; 1-2-2-1-second-stage sun gear; 1-2-2-2-second-stage sun gear. First-stage planetary gear; 1-2-2-3-Second-stage internal gear ring; 1-2-3-Left-hand cutting box; 1-3-Coal scraper spiral blade; 1-4-Internal spray system; 1-4-1-Central channel; 1-4-2-Rotary sealing ring; 1-4-3-Static sealing ring; 1-4-4-Water inlet pipe; 1-4-5-Water delivery pipe; 1-5-Gear; 1-6-Motor; 1-7-Left rocker arm; 1-8-First spiral bevel gear. Implementation

[0039] The present invention will now be described in more detail with reference to the accompanying drawings, which illustrate preferred embodiments of the invention. It should be understood that those skilled in the art can modify the invention described herein while still achieving its advantageous effects. Therefore, the following description should be understood as being of general knowledge to those skilled in the art and is not intended to limit the invention.

[0040] like Figures 1-2 As shown, a rock-breaking mining machine includes: a cutting section (left cutting section 1 and right cutting section 6), a left traction section 2, a right traction section 5, and an intermediate box 3. The left cutting section 1 is hinged to the left traction section 2, and the right cutting section 6 is hinged to the right traction section 5; the intermediate box 3 is disposed between the left traction section 2 and the right traction section 5. The left cutting section 1 and the right cutting section 6 have the same structure and are symmetrically distributed on the left and right sides along the central axis of the mining machine.

[0041] The connection method between the traction unit and the cutting unit is existing technology. The intermediate box 3 controls the cutting movement of the left cutting unit 1 and the right cutting unit 6, as well as the movement of the mining machine. The principle by which the intermediate box 3 controls the left cutting unit 1 and the right cutting unit 6 is also existing technology.

[0042] The cutting section includes a cutting box and a cutting head.

[0043] The cutting box, comprising a primary planetary mechanism, a secondary planetary mechanism, and a cutting box body, enables the cutting head and the cutting box body to rotate synchronously but in opposite directions to achieve tensile rock breaking.

[0044] Both the primary and secondary planetary mechanisms are housed within the cutting box.

[0045] The inner ring of the second-level sun gear of the second-level planetary mechanism is connected to the outer wall of the first-level planet carrier of the first-level planetary mechanism by a key;

[0046] All the secondary planetary shafts of the secondary planetary mechanism are rotatably mounted on the cutting box housing, and their ends are fixed to a first spiral bevel gear. Each first spiral bevel gear meshes with a second spiral bevel gear to drive the second spiral bevel gear to rotate.

[0047] Among them, a portion of the secondary planetary shafts, at the end furthest from the first spiral bevel gear, extends and passes through the secondary planetary gear on it, meshing with the secondary internal gear ring of the secondary planetary mechanism; the outer edge of the secondary internal gear ring is fixed to the inner wall of the cutting box body.

[0048] The cutting head unit includes several cutting heads and several second spiral bevel gears, with the cutting heads and second spiral bevel gears being arranged correspondingly.

[0049] The axle of each second spiral bevel gear is arranged to rotate radially along the second-stage sun gear;

[0050] A cutting head is fixed to the end of the axle of a second spiral bevel gear via a connecting disc, so that the cutting head rotates with its corresponding second spiral bevel gear;

[0051] The rocker arm is used to drive the cutting head to swing. A gear shaft assembly is installed on it. The input end of the gear shaft assembly is connected to the output shaft of the electric motor, and the output end of the gear shaft assembly is connected to the first-stage sun gear shaft of the first-stage planetary mechanism. The electric motor is used to provide power to drive the first-stage planetary mechanism.

[0052] Specifically, taking the left cutting section 1 as an example, the structure is explained as follows:

[0053] like Figures 3-7 As shown, the left cutting section 1 includes a right-hand cutting head 1-1, a left-hand cutting box 1-2, a coal scraper spiral blade 1-3, an internal spray system 1-4, a left rocker arm 1-7, and an electric motor 1-6.

[0054] There are 8 right-hand cutting heads 1-1 and 4 coal scraper auger blades 1-3, arranged circumferentially around the left-hand cutting box 1-2 (the lower shell of the left-hand cutting box 1-2-3 is fixed to the left-hand cutting box 1-2-3). The coal scraper auger blades 1-3 scrape the cut coal and rock onto the scraper conveyor 4, on which the rock-breaking mining machine is placed. The scraper conveyor 4 can promptly transport the cut coal and rock out of the roadway, avoiding affecting the next cutting operation.

[0055] In the left cutting section 1, the right-hand cutting head 1-1 and the left-hand cutting box 1-2 rotate synchronously but in opposite directions, driven by the electric motor 1-6.

[0056] The left-hand cutting box 1-2 includes a primary planetary mechanism 1-2-1, a secondary planetary mechanism 1-2-2, and a left-hand cutting box body 1-2-3. Among them, the left-hand cutting box body 1-2-3 is equivalent to the secondary planetary carrier of the secondary planetary mechanism 1-2-2.

[0057] like Figure 3 As shown, a gear shaft assembly is installed on the left rocker arm 1-7. The input end of the gear shaft assembly is engaged with the output shaft of the motor 1-6, and the output end of the gear shaft assembly is engaged with the first-stage sun gear shaft 1-2-1-1 of the first-stage planetary mechanism 1-2-1. Specifically, the input end of the gear shaft assembly is the first-stage shaft (gear shaft), and the output end of the gear shaft assembly is the third-stage shaft (gear shaft). Gear 1-5 meshes externally with the third-stage shaft and engages with the first-stage sun gear shaft 1-2-1-1, driving the first-stage sun gear shaft 1-2-1-1 to rotate.

[0058] The primary sun gear shaft 1-2-1-1 of the primary planetary mechanism 1-2-1 receives power from the internal gear set (gear shaft set) of the left rocker arm 1-7. The power is then transmitted to the secondary sun gear 1-2-2-1 of the secondary planetary mechanism 1-2-2 through the planet carrier of the primary planetary mechanism 1-2-1. The secondary sun gear 1-2-2-1 of the secondary planetary mechanism 1-2-2 transmits the power to the four secondary planetary gears 1-2-2-2 of the secondary planetary mechanism 1-2-2. The other end of the four secondary planetary gear shafts is extended and four secondary planetary gears 1-2-2-2 are installed, which mesh with the secondary internal gear ring 1-2-2-3 of the secondary planetary mechanism 1-2-2 to transmit power. The secondary internal gear ring 1-2-2-3 is fixed together with the left-hand cutting box body 1-2-3, driving the left-hand cutting box 1-2 to rotate.

[0059] like Figure 5 As shown, the right-hand cutting head unit includes a right-hand cutting head 1-1 and several second spiral bevel gears 1-1-1 (large spiral bevel gears). Each cutting head includes several blast heads that rotate to cut the rock.

[0060] In this configuration, the axle of each second spiral bevel gear 1-1-1 is arranged to rotate radially along the second-stage sun gear 1-2-2-1. For example... Figures 4-5 As shown, the rotational arrangement of the axle of the second spiral bevel gear 1-1-1 is as follows: its left end is rotatably mounted on the left mounting seat via a bearing, and the left mounting seat is fixed to the upper end cover by fasteners; its right end is rotatably mounted on the right mounting seat via a bearing, and the right mounting seat is fixed to the upper end cover by fasteners.

[0061] The second spiral bevel gear 1-1-1 (large spiral bevel gear) meshes with the first spiral bevel gear 1-8 (small spiral bevel gear) at the end of the planetary shaft of the second-stage planetary mechanism 1-2-2 to receive power. A connecting disc is installed on its axle to drive the right-hand cutting head 1-1 to rotate. The water supply pipe 1-4-5 delivers the water mist from the internal spray system 1-4 to the right-hand cutting head 1-1 for cooling and dust suppression.

[0062] like Figure 6 As shown, in this embodiment, an internal spray system 1-4 is further provided.

[0063] The internal spray system 1-4 is used to deliver water mist to the cutting head for cooling and dust suppression. It includes: a spray base, a water supply pipe 1-4-4, a central channel 1-4-1, a rotary sealing ring 1-4-2, and a static sealing ring 1-4-3.

[0064] The spray nozzle has a connecting channel.

[0065] The inlet pipe 1-4-4 is connected to the connecting channel, and a static sealing ring 1-4-3 is installed between it and the inner wall of the connecting channel.

[0066] The central channel 1-4-1 is opened inside the first-stage sun gear shaft. One end of it is connected to the connecting channel, and the other end is connected to the water supply pipe 1-4-5. The water supply pipe 1-4-5 connects to the gap between the second spiral bevel gear and the shaft of the second spiral bevel gear. Water flows into the internal channel of the shaft of the second spiral bevel gear 1-1-1 through this gap and is then sprayed out by the nozzle.

[0067] Rotary sealing ring 1-4-2 is installed between the spray seat and the first-stage sun gear shaft.

[0068] The rotary seal 1-4-2 adopts a combined sealing form, using a Y-type slip ring made of PTFE material and an O-ring made of nitrile rubber for combined sealing. The contact pressure of the combined sealing surface is high, and the sealing effect is better than other sealing forms.

[0069] like Figure 7 As shown, the eight planetary shafts of the secondary planetary mechanism 1-2-2 are specially machined, and the ends of the planetary shafts are integrated with the first spiral bevel gear 1-8 (small spiral bevel gear) to transmit power to the right-hand cutting head 1-1.

[0070] like Figure 8 As shown, when the mining machine is working, the centerline of the right-hand rotary cutting head 1-1 is parallel to the coal face for cutting. The cutting method can be flexibly selected according to the requirements of the working face: the cutting diameter at the large end of the right-hand rotary cutting head 1-1 or the cutting diameter at the small end of the right-hand rotary cutting head 1-1 is used as the cutting depth. Figure 8 As shown, the left image shows the rock breaking process based on the large end diameter, which involves two rock breaking operations with the large end in contact. This method results in a deeper cutting depth and breaks more rock each time. The right image shows the rock breaking process based on the small end diameter, with two rock breaking operations with the small end in contact. This method does not have a triangular cross section.

[0071] The rock-breaking construction method using tensile fracturing includes the following steps:

[0072] Step 1: The scraper conveyor 4 transports the rock-breaking mining machine to the roadway.

[0073] Step 2: Adjust the centerline of the right-hand cutting head 1-1 to be parallel to the coal face.

[0074] Step 3: The motor 1-6 of the left cutting section 1 of the intermediate box 3 starts, and the gear shaft group on the left rocker arm 1-7 drives the first-stage sun gear shaft 1-2-1-1 of the first-stage planetary mechanism 1-2-1 to rotate. The first-stage sun gear shaft 1-2-1-1 drives the planet carrier of the first-stage planetary mechanism 1-2-1 to rotate. The planet carrier of the first-stage planetary mechanism 1-2-1 drives the second-stage sun gear 1-2-2-1 of the second-stage planetary mechanism 1-2-2 to rotate. The second-stage sun gear 1-2-2-1 drives the four second-stage planetary gears 1-2-2-2 to rotate. The second-stage planetary gears 1-2-2-2 mesh with the second-stage internal gear ring 1-2-2-3. The second-stage internal gear ring 1-2-2-3 drives the left-hand cutting box 1-2 to rotate.

[0075] At the same time, the first spiral bevel gear 1-8 at the end of the planetary shaft of the secondary planetary mechanism 1-2-2 drives the second spiral bevel gear 1-1-1 to rotate, the second spiral bevel gear 1-1-1 drives its axle to rotate together, and the connecting disc on the axle of the second spiral bevel gear 1-1-1 drives the right-hand cutting head 1-1 to rotate.

[0076] The working principle of the right cutting section 6 is the same as that of the left cutting section 1.

[0077] The above are merely preferred embodiments of the present invention and do not constitute any limitation on the present invention. Any equivalent substitutions or modifications made by those skilled in the art to the technical solutions and content disclosed in the present invention without departing from the scope of the present invention shall be deemed to have remained within the protection scope of the present invention.

Claims

1. A rock-breaking mining machine, characterized in that, include: The cutting portion includes: The cutting box, comprising a primary planetary mechanism, a secondary planetary mechanism, and a cutting box body, enables the cutting head and the cutting box body to rotate synchronously but in opposite directions to achieve tensile rock breaking, wherein: Both the primary planetary mechanism and the secondary planetary mechanism are housed within the cutting box. The inner ring of the second-level sun gear of the second-level planetary mechanism is connected to the outer wall of the first-level planet carrier of the first-level planetary mechanism by a key; All the secondary planetary shafts of the secondary planetary mechanism are rotatably mounted on the cutting box body, and their ends are respectively fixed to a first spiral bevel gear. Each first spiral bevel gear meshes with a second spiral bevel gear to drive the second spiral bevel gear to rotate. Among them, a portion of the secondary planetary shafts, at the end furthest from the first spiral bevel gear, extends and passes through the secondary planetary gear on it, meshing with the secondary internal gear ring of the secondary planetary mechanism; the outer edge of the secondary internal gear ring is fixed to the inner wall of the cutting box body; The cutting head unit includes a plurality of cutting heads and a plurality of second spiral bevel gears, wherein the cutting heads and the second spiral bevel gears are arranged correspondingly; The axle of each of the second spiral bevel gears is arranged to rotate radially along the second-stage sun gear; One of the cutting heads is fixed to the end of the axle of a second spiral bevel gear via a connecting disc, so that the cutting head rotates with its corresponding second spiral bevel gear; It also includes an internal spray system (1-4) for delivering water mist to the cutting head for cooling and dust suppression, which includes: A spray nozzle with a connecting channel; The water inlet pipe (1-4-4) is connected to the connecting channel, and a static sealing ring (1-4-3) is provided between it and the inner wall of the connecting channel. The central channel (1-4-1) is opened inside the first-stage sun gear shaft. One end of the channel is connected to the connecting channel, and the other end is connected to the water supply pipe (1-4-5). The water supply pipe connects the second spiral bevel gear and the gap between the shaft of the second spiral bevel gear. A rotary sealing ring (1-4-2) is installed between the spray seat and the first-stage sun gear shaft.

2. The rock-breaking mining machine according to claim 1, characterized in that, Also includes: A rocker arm is used to drive the cutting head to swing. A gear shaft assembly is mounted on the rocker arm. The input end of the gear shaft assembly is engaged with the output shaft of the electric motor, and the output end of the gear shaft assembly is engaged with the first-stage sun gear shaft of the first-stage planetary mechanism. The electric motor is used to provide power to drive the first-stage planetary mechanism.

3. The rock-breaking mining machine according to claim 1, characterized in that, The outer wall of the cutting box is provided with several coal scraping spiral blades (1-3). The coal scraping spiral blades (1-3) scrape the cut coal and rock onto the scraper conveyor (4). The rock-breaking mining machine is placed on the scraper conveyor (4).

4. The rock-breaking mining machine according to claim 1, characterized in that, The cutting section includes a left cutting section (1) and a right cutting section (6). The left cutting section (1) is hinged to the left traction section (2), and the right cutting section (6) is hinged to the right traction section (5); an intermediate box (3) is provided between the left traction section (2) and the right traction section (5).

5. The rock-breaking mining machine according to claim 1, characterized in that, During operation, the cutting head's centerline is parallel to the coal face for cutting.

6. A construction method for a rock-breaking mining machine as described in any one of claims 1-5, characterized in that, Includes the following steps: When the motor starts, the gear shaft assembly on the rocker arm drives the first-stage sun gear shaft of the first-stage planetary mechanism to rotate. The first-stage sun gear shaft drives the planet carrier of the first-stage planetary mechanism to rotate. The planet carrier of the first-stage planetary mechanism drives the second-stage sun gear of the second-stage planetary mechanism to rotate. The second-stage sun gear drives the second-stage planetary gear to rotate. The second-stage planetary gear meshes with the second-stage internal gear ring, and the second-stage internal gear ring drives the cutting box to rotate. At the same time, the first spiral bevel gear at the end of the planetary shaft of the secondary planetary mechanism drives the second spiral bevel gear to rotate, the second spiral bevel gear drives its axle to rotate together, and the connecting disc on the axle of the second spiral bevel gear drives the cutting head to rotate.

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