Thin coal seam embedded cutting device and method

Abstract

The present invention discloses a thin coal seam embedded cutting device and method, which relates to the technical field of coal mining machines. The cutting device includes a machine body, a cutting wheel, a spiral plate and a plurality of cutting components. A water tank is arranged in the machine body, and the fixed seat and the cutting teeth both have a first through hole connected to the elastic cylinder. The coolant in the water tank is transported to the cutting teeth through a water pipe under the action of the increase to cool the cutting teeth. The coolant of the present invention enters the hollow tube, the disc and the dividing block in sequence after being pressurized. The cutting teeth slide forward in the fixed seat under the action of the impact force, and due to the gradual reduction of the cross section, the coolant is further pressurized step by step during the flow process, so that it flows rapidly and frequently, and increases the contact with the second component, thereby improving the heat transfer rate; on the other hand, when the coolant refluxes, it refluxes from the guide hole under the action of the internal pressure of the first component and then is sprayed out through the nozzle for dust reduction treatment, which greatly alleviates the problem of dusty working environment inside the tunnel.

Description

Technical Field

[0001] The invention relates to the technical field of coal mining machines, and in particular to a thin coal seam embedded cutting device and method. Background Art

[0002] my country is a coal-producing country with rich coal resources, large reserves and diversified occurrence structures. Based on the domestic coal seam thickness, thin coal seams refer to coal seam structures with a thickness of 0.8 to 1.3 m, and if the coal seam thickness is <0.8 m, it is an extremely thin coal seam structure. Considering that the current coal reserves in my country account for more than 6 billion tons of thin coal seam mining areas, accounting for about 20% of the country's total coal reserves, while the output accounts for only 10.4% of the total output, in order to achieve high-yield and efficient mining of thin coal seams, it is necessary to actively think about and study the mining technology of thin coal seams in coal mines.

[0003] At present, there are two main methods of mining thin coal seams, namely "blasting" and "machine mining". The "blasting" method has the disadvantages of low mining efficiency and poor safety, while the "machine mining" method has the characteristics of strong applicability, high degree of mechanization and high mining volume. The main "machine mining" methods include coal planers and drum coal mining machines, which are the most widely used in thin coal seam mining in my country at this stage. The rocker arm is one of the important components of the drum coal mining machine in the machine mining process. It plays the role of transmitting power and helping the drum to rise and fall. It is subject to various complex dynamic loads during operation, which will generate a lot of heat, and the pick teeth cannot effectively dissipate heat, affecting its service life.

[0004] In addition, in the process of coal mining, such as drilling, blasting, tunneling and coal mining operations, roof management, coal loading and transportation, etc., a large amount of dust will be generated in various links. Due to the different geological conditions and physical properties of coal and rock, different mining methods, operation methods, ventilation conditions and mechanization levels in different mines, the dust location conditions are also different. Under the existing dust prevention and control technical conditions, the proportion of dust generated in each production link is roughly: coal mining face accounts for about 45%-80%, tunneling face accounts for about 20%-38%, anchor spraying accounts for about 10%-15%, transportation ventilation tunnel accounts for about 5%-10%, and other operation points account for about 2%-5%. The higher the degree of mechanization of each operation point, the greater the dust production will be. Therefore, in coal mining work, dust reduction is urgently needed to effectively protect the workers in the tunnel. Summary of the invention

[0005] The present invention aims to solve one of the technical problems in the related art at least to a certain extent.

[0006] To this end, an embodiment of the present invention provides a thin coal seam embedded cutting device and method.

[0007] On the one hand, the present invention provides a thin coal seam embedded cutting device, characterized in that it comprises:

[0008] A machine body, wherein a rocker arm is arranged outside the machine body, and a water tank is arranged inside the machine body;

[0009] A cutting wheel, the cutting wheel is rotatably mounted on the rocker arm and is in contact with the excavation face;

[0010] A spiral plate, the spiral plate is fixedly mounted on the cutting wheel;

[0011] A plurality of cutting components, the cutting components comprising a mounting seat, a fixing seat and cutting teeth, the mounting seat being fixedly mounted on the surface of the spiral plate, the fixing seat being fixedly connected to the mounting seat, the cutting teeth being movably arranged in the fixing seat, an elastic cylinder being fixedly connected between the bottom surface of the cutting teeth and the inner bottom surface of the fixing seat, the fixing seat and the cutting teeth both having a first through hole connected to the elastic cylinder, a water pipe being sealedly connected between the water tank and the first through hole on the fixing seat, and the coolant in the water tank being transported to the cutting teeth through the water pipe under the action of increasing the temperature to cool the cutting teeth.

[0012] In some embodiments, the elastic cylinder includes a bellows and an elastic member sleeved thereon, the elastic member is a spring, and the spring is clamped in a groove of the bellows.

[0013] In some embodiments, the cutting tooth includes a first component and a second component connected by a bearing, a hollow tube cooperating with the first through hole is arranged in the first component, a disc and a dividing block are fixedly arranged in sequence at one end of the hollow tube away from the first through hole, a guide hole is arranged on the disc, and a one-way valve is arranged in the guide hole.

[0014] In some embodiments, the hollow diameters of the hollow tube, the disc, and the dividing block decrease sequentially.

[0015] In some embodiments, a nozzle connected to the interior of the first component is disposed on the surface of the first component, and a plurality of second mounting holes are provided on the fixing seat at equal intervals along the circumferential direction. When the first component is displaced by force, the nozzle is embedded in the second mounting hole.

[0016] In some embodiments, a second through hole is opened in the first component, a piston member is fixedly installed in the fixing seat, an air port of the piston member is connected to an air pipe of the nozzle, the piston member is connected to a flow channel opened in the fixing seat, and when the first component is displaced by force, the second through hole adapts to the flow channel.

[0017] In some embodiments, a flow guide tube adapted to the flow guide hole is disposed on a surface of the disk away from the dividing block, and a turbine assembly is rotatably mounted on an end of the flow guide tube away from the disk.

[0018] In some embodiments, the turbine assembly includes a push rod, the first component is provided with a sliding hole for the push rod to slide, one end of the push rod located in the sliding hole is fixedly mounted with a piston block, and the piston block abuts against the piston member.

[0019] In some embodiments, the opening end of the fixing seat is bent inward to have a baffle, and the baffle is in sealing contact with the second through hole.

[0020] On the other hand, the present invention proposes a thin coal seam embedded cutting method, which is characterized by comprising the following steps.

[0021] Start the power system to crush the coal seam through the cutting teeth;

[0022] The coolant in the water tank is passed into the hollow tube, the disc and the dividing block in sequence by pressurization to cool the cutting teeth;

[0023] When the coolant flows back, it flows back from the guide hole under the action of the internal pressure of the first component and then is sprayed out through the nozzle for dust reduction treatment.

[0024] Compared with the prior art, the beneficial effects of the present invention are:

[0025] The thin coal seam embedded cutting device of the present invention, through the arrangement of the first component and the second component, on the one hand, the coolant enters the hollow tube, the disc and the dividing block in sequence through the water pipe under the action of supercharging, and the cutting teeth slide forward in the fixed seat under the action of the impact force, and due to the gradual reduction of the cross-section, the coolant is further pressurized step by step during the flow process, so that its rapid flow frequently increases the contact with the second component, thereby improving the heat transfer rate; on the other hand, when the coolant refluxes, it refluxes from the guide hole under the action of the internal pressure of the first component and then is sprayed out through the nozzle for dust reduction treatment, which greatly alleviates the problem of dusty working environment inside the tunnel.

[0026] In the thin coal seam embedded cutting device of the present invention, the turbine in the first component rotates under the action of the water flow and causes the push rod to slide in the sliding hole and push the piston plate to intermittently change the pressure in the shell; when the pressure in the shell is negative, part of the coolant is sucked in through the flow channel; when the pressure in the shell is positive, the internal coolant is squeezed into the nozzle through the air port, thereby increasing the coolant flow rate in the nozzle and increasing the dust reduction range; secondly, the problem of excessive water stains in local areas is reduced.

[0027] In the thin coal seam embedded cutting device of the present invention, the second component can rotate under the action of resistance, converting the original sliding friction into rolling friction, so that the cutting teeth are evenly stressed, thereby increasing their wear resistance and service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0029] Figure 1 It is a structural schematic diagram of the cutting device of the present invention;

[0030] Figure 2 It is a structural diagram of the spiral plate of the cutting device of the present invention;

[0031] Figure 3 It is a schematic diagram of the structure of the cutting assembly of the cutting device of the present invention;

[0032] Figure 4 It is a schematic diagram of the structure of the cutting teeth of the cutting device of the present invention;

[0033] Figure 5 A schematic diagram of a disc and a connection structure of a cutting device of the present invention;

[0034] Figure 6 A schematic diagram of the turbine and internal structure of the cutting device of the present invention;

[0035] Figure 7 The cutting device of the present invention Figure 4 The structural diagram of part A in the figure;

[0036] Description of reference numerals:

[0037] 1. Machine body; 2. Rocker arm; 3. Cutting wheel; 4. Spiral plate; 401. First mounting hole; 5. Cutting assembly; 51. Mounting seat; 52. Fixed seat; 521. Second mounting hole; 522. Baffle; 53. Cutting tooth; 531. First component; 532. Second component; 54. Bellows; 55. Hollow tube; 56. Disc; 561. Guide hole; 562. Guide pipe; 563. Turbine; 564. Crank; 565. Push rod; 566. Piston block; 57. Splitting block; 58. Nozzle; 581. Air pipe; 59. Piston member; 591. Air port; 501. First through hole; 502. Sliding hole; 503. Flow channel; 504. Second through hole; 6. Water tank; 61. Water pipe. DETAILED DESCRIPTION

[0038] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0039] The following describes a thin coal seam embedded cutting device and method according to an embodiment of the present invention with reference to the accompanying drawings.

[0040] like Figure 1-7 As shown, the thin coal seam embedded cutting device of the present invention comprises a body 1 with a rocker arm 2, a cutting wheel 3, a spiral plate 4 and a plurality of cutting components 5.

[0041] The cutting wheel 3 is rotatably mounted on the rocker arm 2 and contacts the excavation face; the spiral plate 4 is fixedly mounted on the cutting wheel 3 and is used to transport the mined coal to the rear; the cutting assembly 5 includes a mounting seat 51, a fixing seat 52 and cutting teeth 53, the mounting seat 51 is fixedly mounted on the surface of the spiral plate 4, the fixing seat 52 is fixedly connected to the mounting seat 51, and the cutting teeth 53 are movably arranged in the fixing seat 52.

[0042] Specifically, the surface of the spiral plate 4 has a first mounting hole 401, and the cutting assembly 5 includes a mounting seat 51, a fixing seat 52 and a cutting tooth 53. The mounting seat 51 is fixed in the first mounting hole 401 through a connecting piece, the fixing seat 52 is welded to the mounting seat 51, and the cutting tooth 53 is movably arranged in the fixing seat 52. The cutting tooth 53 is made of high-speed steel and has a wear-resistant coating to increase its service life.

[0043] In some embodiments, the connector is a pin.

[0044] An elastic cylinder is fixedly connected between the bottom surface of the cutting tooth 53 and the inner bottom surface of the fixed seat 52. The fixed seat 52 and the cutting tooth 53 both have a first through hole 501 connected to the elastic cylinder. A water pipe 61 is sealedly connected between the water tank 6 and the first through hole 501 on the fixed seat 52. The coolant in the water tank 6 is transported to the cutting tooth 53 through the water pipe 61 under the action of increasing the temperature to cool the cutting tooth 53.

[0045] In some embodiments, the elastic cylinder includes a bellows 54 and an elastic member sleeved thereon, the elastic member is a spring, and the spring is clamped in the groove of the bellows 54. Specifically, the bellows 54 is fixedly connected between the cutting tooth 53 and the inner bottom surface of the fixing seat 52, and the bellows 54 is sleeved with an elastic member, which is a spring and is clamped in the groove of the bellows 54, so that the bellows 54 has elasticity and plays a role of automatic reset. The fixing seat 52 and the cutting tooth 53 are both provided with a first through hole 501 connected to the bellows 54. A water tank 6 is provided in the machine body 1, and a coolant is placed in the water tank 6. A water pipe 61 is sealed and connected between the water tank 6 and the first through hole 501 on the fixing seat 52.

[0046] When the thin coal seam embedded cutting device of the present invention is used in actual application, the power system in the start-up rocker arm 2 transmits the rotational force to the cutting wheel 3, and then the coal seam is crushed by the cutting teeth 53 in the cutting assembly 5. The crushed coal falls onto the conveyor belt in the tunnel. The coolant in the water tank 6 is transported to the cutting teeth 53 through the water pipe 61 under the action of supercharging to cool the cutting teeth 53, thereby ensuring its service life and improving its heat dissipation performance.

[0047] During excavation, the cutting tooth 53 has a pick-shaped cross section and is in direct contact with the mining surface, and cannot be twisted, which easily causes single-sided wear of the cutting tooth tip, and after being blunted, it is easy to form a large shear resistance. The present invention makes improvements on this basis. Specifically, the cutting tooth 53 of the present invention includes a first component 531 and a second component 532, and the first component 531 and the second component 532 are connected by a bearing. The second component 532 can rotate under the action of resistance, converting the original sliding friction into rolling friction, so that the cutting tooth 53 is evenly stressed, thereby increasing its wear resistance and service life.

[0048] A hollow tube 55 cooperating with the first through hole 501 is arranged in the first component 531, and a disc 56 and a dividing block 57 are fixedly arranged in sequence on one end of the hollow tube 55 away from the first through hole 501, a guide hole 561 is arranged on the disc 56, and a one-way valve is arranged in the guide hole 561, and the hollow diameters of the hollow tube 55, the disc 56 and the dividing block 57 are reduced in sequence.

[0049] After being pressurized, the coolant enters the hollow tube 55, the disc 56 and the dividing block 57 in sequence. Due to the gradual reduction in the cross-section, the coolant is further pressurized step by step during the flow process, so that it flows rapidly and frequently increases the contact with the second component 532, thereby improving the heat transfer rate.

[0050] In some embodiments, a nozzle 58 is fixedly mounted on the surface of the first member 531, and the nozzle 58 is connected to the inside of the first member 531. The fixing seat 52 is provided with a plurality of second mounting holes 521 equidistantly along the circumferential direction. When the first member 531 is displaced by force, that is, when the first member 531 is subjected to the upward impact force of the water flow, the nozzle 58 is embedded in the second mounting hole 521. It is understandable that when the first member 531 is not displaced by force, the nozzle 58 is located below the second mounting hole 521. In some embodiments, the number of the nozzles 58 is 4-6, and the nozzles 58 correspond to the second mounting holes 521.

[0051] In some embodiments, a second through hole 504 is provided in the first component 531, a piston member 59 is fixedly installed in the fixed seat 52, an air port 591 of the piston member 59 is connected to an air pipe 581 of the nozzle 58, and the piston member 59 is connected to a flow channel 503 provided in the fixed seat 52, and when the first component 531 is displaced by force, the second through hole 504 is adapted to the flow channel 503. That is, a piston member 59 is fixedly installed in the fixed seat 52, the piston member 59 has an air port 591, the nozzle 58 has an air pipe 581 that can be sealed and connected to the air port 591, the fixed seat 52 has a flow channel 503, one end of the flow channel 503 is connected to the piston member 59, and a second through hole 504 is provided in the first component 531, and when the first component 531 is displaced by force, the second through hole 504 corresponds to the flow channel 503.

[0052] It should be noted that the piston member 59 includes a shell having a piston plate, and a one-way valve is installed at the contact portion between the shell and the flow channel 503. A one-way valve is also installed in the air port 591, and the working surfaces of the two one-way valves are opposite, so that the coolant in the shell can only flow in the specified direction and will not flow back, that is, it will not cause backflow of the contact portion between the shell and the flow channel 503 and the medium inside the air port 591.

[0053] A flow guide tube 562 adapted to the flow guide hole 561 is disposed on one side of the disk 56 away from the dividing block 57, and a turbine assembly is rotatably mounted on one end of the flow guide tube 562 away from the disk 56. The turbine assembly includes a push rod 565, and a sliding hole 502 is provided in the first component 531 for the push rod 565 to slide. A piston block 566 is fixedly mounted on one end of the push rod 565 located in the sliding hole 502, and the piston block 566 abuts against the piston member 59.

[0054] Specifically, two symmetrically arranged guide tubes 562 are fixedly installed on one side of the disc 56 away from the dividing block 57. The guide tubes 562 are adapted to the guide holes 561. A turbine 563 is rotatably installed on one end of the guide tube 562 away from the disc 56. A crank 564 is fixedly installed in the turbine 563. A push rod 565 is rotatably installed on the crank 564. The first component 531 has a sliding hole 502 for the push rod 565 to slide. One end of the push rod 565 passes through the sliding hole 502 and abuts against the piston member 59. The end of the push rod 565 located in the sliding hole 502 is fixedly installed with a piston block 566.

[0055] During operation, the coolant of the present invention enters the hollow tube 55 after being pressurized and then impacts the disc 56, driving the first component 531 and the second component 532 to move upward as a whole in the fixing seat 52. The nozzle 58, which was originally tightly sealed by the inner wall of the fixing seat 52, is embedded in the second mounting hole 521 to form a passage. On the one hand, the coolant is continuously changed in the second component 532 and flows back from the guide hole 561 under the action of internal pressure, and then is sprayed out through the nozzle 58 for dust reduction treatment; on the other hand, during the follow-up movement, the air pipe 581 on the surface of the nozzle 58 is connected with the air port 591 on the shell. A passage is formed among the first component 531, the piston member 59 and the nozzle 58. The turbine 563 in the first component 531 rotates under the action of the water flow and transmits the rotational force to the crank 564. The crank 564 reciprocates and drives the push rod 565 to slide in the slide hole 502 and pushes the piston plate to intermittently change the pressure in the shell. When the pressure in the shell is negative, part of the coolant is sucked in through the flow channel 503. When the pressure in the shell is positive, the internal coolant is squeezed into the nozzle 58 through the air port 591, thereby increasing the coolant flow rate in the nozzle 58 and increasing the dust reduction range.

[0056] In order to maintain the sealing performance inside the first component 531 in the original state, the opening end of the fixing seat 52 is bent inward to form a baffle 522 , and the baffle 522 is in sealing contact with the second through hole 504 .

[0057] The thin coal seam embedded cutting method uses the thin coal seam embedded cutting device of the present invention, comprising the following steps:

[0058] S1: Start the power system in the rocker arm 2 to transmit the rotational force to the cutting wheel 3, and then the coal seam is crushed by the cutting teeth 53 in the cutting assembly 5. The cutting teeth 53 include a first component 531 and a second component 532. The second component 532 can rotate under the action of resistance, converting the original sliding friction into rolling friction, so that the cutting teeth 53 are evenly stressed, thereby increasing their wear resistance and service life;

[0059] S2: The coolant in the water tank 6 enters the hollow tube 55, the disc 56 and the dividing block 57 in sequence through the water pipe 61 under the action of supercharging, and the cutting teeth 53 slide forward in the fixing seat 52 under the action of the impact force. In addition, due to the gradual reduction of the cross section, the coolant is further pressurized step by step during the flow process, so that it flows quickly and frequently, increasing the contact with the second component 532, thereby improving the heat transfer rate;

[0060] S3: When the coolant flows back, it flows back from the guide hole 561 under the action of the internal pressure of the first component 531 and then is sprayed out through the nozzle 58 to perform dust reduction treatment;

[0061] S4: When the nozzle 58 is following and moving, the air pipe 581 on the surface is connected to the air port 591 on the shell, forming a passage between the first component 531, the piston member 59 and the nozzle 58. The turbine 563 in the first component 531 rotates under the action of the water flow and transmits the rotational force to the crank 564. The crank 564 reciprocates and drives the push rod 565 to slide in the slide hole 502 and pushes the piston plate to intermittently change the pressure in the shell. When the pressure in the shell is negative pressure, part of the coolant is sucked in through the flow channel 503. When the pressure in the shell is positive pressure, the internal coolant is squeezed into the nozzle 58 through the air port 591, thereby increasing the coolant flow rate in the nozzle 58 and increasing the dust reduction range.

[0062] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms may be for different embodiments or examples. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, unless they are contradictory.

[0063] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0064] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A thin coal seam embedded cutting device, characterized in that: include: A machine body, wherein a rocker arm is arranged outside the machine body, and a water tank is arranged inside the machine body; A cutting wheel, the cutting wheel is rotatably mounted on the rocker arm and is in contact with the excavation face; A spiral plate, wherein the spiral plate is fixedly mounted on the cutting wheel; A plurality of cutting components, the cutting components comprising a mounting seat, a fixing seat and a cutting tooth, the mounting seat being fixedly mounted on the surface of the spiral plate, the fixing seat being fixedly connected to the mounting seat, the cutting tooth being movably arranged in the fixing seat, an elastic cylinder being fixedly connected between the bottom surface of the cutting tooth and the inner bottom surface of the fixing seat, the fixing seat and the cutting tooth both having a first through hole communicating with the elastic cylinder, a water pipe being sealedly connected between the water tank and the first through hole on the fixing seat, the coolant in the water tank being transported to the cutting tooth through the water pipe under the action of increasing the temperature to cool the cutting tooth, The cutting tooth includes a first component and a second component connected by a bearing, a hollow tube matched with the first through hole is arranged in the first component, a disc and a dividing block are fixedly arranged in sequence at one end of the hollow tube away from the first through hole, a guide hole is arranged on the disc, a one-way valve is arranged in the guide hole, the hollow diameters of the hollow tube, the disc and the dividing block are reduced in sequence, a nozzle connected with the interior of the first component is arranged on the surface of the first component, and a plurality of second mounting holes are equidistantly provided on the fixing seat along the circumferential direction, and when the first component is displaced by force, the nozzle is embedded in the second mounting hole.

2. The thin coal seam embedded cutting device according to claim 1, characterized in that: The elastic cylinder comprises a bellows and an elastic member sleeved thereon, wherein the elastic member is a spring, and the spring is clamped in a groove of the bellows.

3. The thin coal seam embedded cutting device according to claim 1, characterized in that: A second through hole is provided in the first component, a piston is fixedly installed in the fixing seat, an air port of the piston is connected to an air pipe of the nozzle, the piston is connected to a flow channel provided in the fixing seat, and when the first component is displaced by force, the second through hole adapts to the flow channel.

4. The thin coal seam embedded cutting device according to claim 3, characterized in that: A flow guide pipe matched with the flow guide hole is arranged on one side of the disk away from the dividing block, and a turbine assembly is rotatably mounted on one end of the flow guide pipe away from the disk.

5. The thin coal seam embedded cutting device according to claim 4, characterized in that: The turbine assembly comprises a push rod, the first component is provided with a sliding hole for the push rod to slide, one end of the push rod located in the sliding hole is fixedly mounted with a piston block, and the piston block abuts against the piston member.

6. The thin coal seam embedded cutting device according to claim 5, characterized in that: The opening end of the fixing seat is bent inwardly to have a baffle, and the baffle is in sealing contact with the second through hole.

7. A thin coal seam embedded cutting method, characterized in that: The thin coal seam embedded cutting device according to any one of claims 1 to 6 comprises the following steps: Start the power system to crush the coal seam through the cutting teeth; The coolant in the water tank is passed into the hollow tube, the disc and the dividing block in sequence by pressurization to cool the cutting teeth; When the coolant flows back, it flows back from the guide hole under the action of the internal pressure of the first component and then is sprayed out through the nozzle for dust reduction treatment.

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