Internal spraying type cutting head

Abstract

The utility model discloses an internal spraying type cutting head, which is used for solving the problem of troublesome disassembly, assembly and maintenance caused by welding and fixing of a tooth holder of the existing cutting head. The cutting head comprises a cutting head body, tooth holders and cutting teeth, seat grooves are distributed in the circumferential surface of the cutting head body in a threaded mode, and connecting seats are arranged in the seat grooves. A seat body of the connecting seat is provided with a mounting groove clamped with the tooth seat, a notch is provided with a locking structure, and one end of the seat body is provided with a reinforcing block attached to the surface of the cutting head body. The installation groove is composed of a fixed cavity and an extension cavity, and all parts of the tooth holder are matched with the installation groove. A water supply pipeline is arranged in the cutting head body, the connecting seat is provided with a nozzle assembly, and internal spraying is achieved through serial channel communication. By means of the design, the tooth holder can be detached and replaced underground, well lifting maintenance is not needed, the downtime is greatly shortened, the production efficiency is improved, the maintenance cost is reduced, and the tooth holder stress and the equipment stability are enhanced through the reinforcing blocks.

Description

Technical Field

[0001] This utility model relates to the technical field of tunneling machine parts, and in particular to an internal spray cutting head. Background Technology

[0002] The cutting head is one of the most critical working components in mining, tunneling, and underground engineering construction, mainly used for breaking coal seams, rocks, or other geological materials. It is usually installed on a tunnel boring machine, coal mining machine, or tunnel boring machine; it mainly consists of a cutting head body, a tooth holder welded to the cutting head body, and cutting teeth set on the tooth holder; while the internal spray cutting head has a built-in spray system on the cutting head body, which can spray high-pressure water jets on the working area of ​​the cutting teeth through built-in nozzles to achieve efficient dust suppression, cutting tooth cooling, and rock breaking assistance functions.

[0003] In current cutting heads, the cutting teeth and tooth holders come into contact with coal and rock during operation. This frequent impact from the coal and rock causes significant wear and cracking, rendering them unusable and necessitating frequent replacement. However, current tooth holders are welded to the cutting head body, making disassembly and replacement impossible underground. Maintenance typically requires venturing the equipment out of the mine and up to the surface, a cumbersome and inefficient process that severely impacts work efficiency. Utility Model Content

[0004] The main purpose of this utility model is to provide an internal spray cutting head, which aims to solve the problem that the existing cutting heads are difficult to disassemble and maintain because they are fixedly connected to the cutting head body by welding.

[0005] To achieve the above objectives, this utility model proposes an internal spray cutting head, comprising a cutting head body, several tooth seats, and cutting teeth disposed on the tooth seats. The surface of the cutting head body is provided with several seat grooves and connecting seats disposed within the seat grooves. The several seat grooves are disposed on the circumferential surface of the cutting head body and are distributed in a spiral pattern along the length direction of the cutting head. The connecting seat includes a seat body fixedly disposed within the seat groove. The seat body is provided with a mounting groove that engages with the tooth seats, and an opening is provided at one end of the mounting groove facing the working surface of the cutting teeth. A locking structure is provided at the opening. A reinforcing block is also provided at the end of the seat body away from the opening. The reinforcing block is fixedly connected to the seat body and its bottom surface is fitted against the surface of the cutting head body.

[0006] In one possible implementation, the mounting groove includes a rectangular fixed cavity and an extension cavity located above the fixed cavity, wherein the length and width of the fixed cavity are greater than the length and width of the extension cavity; the tooth seat includes a fixed part disposed in the fixed cavity, the fixed part is provided with a connecting part passing through the extension part, the connecting part is provided with a mounting part with a through hole, and the cutting tooth is fixedly disposed in the through hole of the mounting part.

[0007] In one possible implementation, the periphery of the fixing part is provided with a sealing surface that protrudes outward, and the inner wall of the fixing cavity is fitted with the sealing surface.

[0008] In one possible implementation, the cutting head body is provided with a water supply pipeline connected to an external water supply module, and the connecting seat is provided with a plurality of nozzle assemblies connected to the water supply pipeline, and the plurality of nozzle assemblies are disposed on the periphery of the tooth seat.

[0009] In one possible implementation, water spray seats are provided on both sides of the connecting seat, and a water storage cavity communicating with the water supply pipeline is provided in the water spray seat; a plurality of mounting holes communicating with the water storage cavity are provided on the side of the water spray seat facing the working surface of the cutting tooth, and the nozzle assembly is disposed in the mounting holes and communicates with the water supply pipeline through the water storage cavity.

[0010] In one possible implementation, the water supply pipeline includes several outlets that pass through the cutting head body and correspond to the connecting seat. The bottom of the fixed cavity is provided with a water outlet communicating with the outlets. The inner wall of the fixed cavity is provided with a flow channel communicating with the water storage cavity. It also includes a transfer groove provided at the bottom of the fixed part and a water passage groove connecting the transfer groove and the flow channel. The transfer groove corresponds to the position of the water outlet. When the fixed part is stuck in the fixed cavity, the water outlet and the flow channel are interconnected.

[0011] In one possible implementation, the water spray base is provided with a mounting surface perpendicular to the length direction of the cutting teeth, the mounting hole is provided on the mounting surface, and a protective plate can be detachably provided on the mounting surface. The protective plate is provided with a guide port, which can guide the water mist spraying direction of the nozzle assembly.

[0012] In one possible implementation, the sealing surface is arc-shaped.

[0013] In one possible implementation, the locking structure includes a locking block disposed at the opening, the locking block being fixed to the connecting seat by bolts.

[0014] In one possible implementation, the water supply pipeline includes a connecting cavity disposed within the cutting head body, a sealing cover disposed within the connecting cavity, and a water storage space connected to an external water supply module formed between the sealing cover and the connecting cavity, the water storage space being connected to a water outlet.

[0015] In summary, the beneficial effects of this application are as follows:

[0016] Compared to existing technologies, this application utilizes a connecting seat on the surface of the cutting head body, allowing the tooth holder to be engaged and fixed via a specific mounting groove structure, and achieving a stable connection with a locking structure. This design avoids the maintenance difficulties associated with the traditional welding-fixed method for cutting head tooth holders, enabling the tooth holder to be disassembled and replaced directly underground in the coal mine without needing to bring the equipment up for maintenance. This significantly reduces downtime, improves production efficiency, and lowers maintenance costs. Simultaneously, the reinforcing block on the connecting seat enhances the tooth holder's load-bearing capacity. The reinforcing block's close fit to the cutting head surface allows the cutting reaction force transmitted by the tooth holder to diffuse through surface contact, reducing local stress peaks and providing greater stability during high-intensity cutting operations. This prevents damage caused by frequent impacts and improves the equipment's durability. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0018] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0019] Figure 2 This is a schematic diagram showing the connection between the connecting seat and the cutting head body of this utility model;

[0020] Figure 3 This is a cross-sectional schematic diagram of the cutting head body;

[0021] Figure 4 This is an exploded structural diagram of the tooth holder and connecting seat of this utility model;

[0022] Figure 5 This is a three-dimensional structural diagram of the connector of this utility model;

[0023] Figure 6 This is a bottom structural diagram of the tooth holder of this utility model;

[0024] Figure 7 This is a cross-sectional view of the connection between the connector and the toothed seat of this utility model;

[0025] Explanation of icon numbers:

[0026] 1. Cutting head body; 2. Tooth seat; 3. Cutting tooth; 4. Seat groove; 5. Connecting seat; 51. Seat body; 52. Mounting groove; 521. Fixing cavity; 522. Extension cavity; 523. Fixing part; 524. Connecting part; 525. Mounting part; 53. Opening; 54. Locking structure; 541. Locking block; 55. Reinforcing block; 6. Sealing surface; 7. Water supply pipeline; 71. Water outlet; 72. Water passage; 73. Flow channel; 74. Transfer trough; 75. Water passage trough; 8. Spray seat; 81. Water storage cavity; 82. Sprayer assembly; 9. Mounting surface; 10. Protective plate; 11. Guide port; 12. Connecting cavity; 13. Sealing cover; 14. Water storage space; 15. Water passage.

[0027] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0029] This utility model proposes an internal spray cutting head, including a cutting head body 1, several tooth seats 2, and cutting teeth 3 disposed on the tooth seats 2. The cutting head body 1 can be connected to a rock excavator and its water supply module. The connection method between the cutting head body 1 and the rock excavator is existing technology and will not be elaborated upon in this application. When the rock excavator is working, the cutting head is driven to rotate. At this time, the rotating cutting head body 1 drives the tooth seats 2 and cutting teeth 3 on its surface to rotate, thereby achieving impact crushing of coal and stone.

[0030] Because the existing cutting head tooth holders 2 are fixed to the cutting head body 1 by welding, the impact of coal and rock on the cutting teeth 3 and tooth holders 2 during operation causes them to wear out rapidly. When they cannot work properly, the workers need to stop the machine and bring the cutting head up to the surface for maintenance, which is very troublesome and cumbersome, seriously affecting production efficiency. Therefore, this embodiment improves the connection method between the cutting head body 1 and the tooth holder 2.

[0031] like Figure 1-2 As shown, the surface of the cutting head body 1 is provided with a plurality of seat grooves 4 and a connecting seat 5 disposed in the seat grooves 4. The plurality of seat grooves 4 are disposed on the circumferential surface of the cutting head body 1 and are distributed in a spiral shape along the length direction of the cutting head.

[0032] The groove 4 allows for the positioning of the connecting seat 5, facilitating welding between the connecting seat 5 and the cutting head body 1. Simultaneously, during operation, when the cutting head is subjected to external impacts, the impact force is transmitted to the connecting seat 5. Without the groove 4, if the connecting seat 5 were only welded to the surface of the cutting head body 1, the weld between the connecting seat 5 and the cutting head body 1 would be frequently subjected to impacts, leading to cracking and damage. The groove 4, however, limits and fixes the connecting seat 5, distributing the impact force to the cutting head body 1, thus reducing the impact force on the weld and preventing damage and cracking.

[0033] And such Figure 4 As shown, the connecting seat 5 includes a seat body 51 fixedly installed in the seat groove 4. The seat body 51 is provided with a mounting groove 52 that engages with the tooth seat 2. The mounting groove 52 has an opening 53 at one end facing the working surface of the cutting tooth 3. A locking structure 54 is provided at the opening 53. A reinforcing block 55 is also provided at the end of the seat body 51 away from the opening 53. The reinforcing block 55 is fixedly connected to the seat body 51 and its bottom surface is attached to the surface of the cutting head body 1.

[0034] The mounting slot 52 includes a rectangular fixed cavity 521 and an extension cavity 522 located above the fixed cavity 521. The length and width of the fixed cavity 521 are greater than the length and width of the extension cavity 522. The tooth base 2 includes a fixed part 523 disposed in the fixed cavity 521. The fixed part 523 is provided with a connecting part 524 passing through the extension part. The connecting part 524 is provided with a mounting part 525 with a through hole. The cutting tooth 3 is fixedly disposed in the through hole of the mounting part 525.

[0035] The seat 51 is fixed in the seat groove 4, and the mounting groove 52 on it engages with the tooth seat 2. This engagement method makes the installation of the tooth seat 2 more convenient. Compared with the traditional welding method, when the tooth seat 2 needs to be replaced due to wear and tear from coal and stone impact, it can be directly removed from the mounting groove 52 without complicated disassembly process, which greatly improves maintenance efficiency and ensures production continuity.

[0036] A locking structure 54 is provided at the opening 53 of the mounting slot 52. The locking structure 54 includes a locking block 541 provided at the opening 53. The locking block 541 is connected and fixed to the connecting seat 5 by bolts. It can firmly fix the tooth seat 2 and prevent the tooth seat 2 from falling out due to vibration or force during the rotation of the cutting head to impact the coal and stone, so as to ensure the stable operation of the cutting work.

[0037] The reinforcing block 55 at the end of the seat 51 away from the opening 53 is fixedly connected to the seat 51 and its bottom surface is in contact with the surface of the cutting head body 1. The reinforcing block 55 enhances the overall structural strength of the connecting seat 5. When bearing the impact force of coal and stone on the tooth seat 2 and the connecting seat 5, it can effectively disperse the stress, prevent the connecting seat 5 from loosening or deforming, extend the service life of the connecting seat 5, and thus improve the overall stability of the cutting head.

[0038] The mounting groove 52 consists of a lower rectangular fixed cavity 521 and an upper extended cavity 522, with the fixed cavity 521 being larger in length and width than the extended cavity 522. The corresponding fixing part 523, connecting part 524, and mounting part 525 of the tooth holder 2 are adapted to it. The fixing part 523 is placed inside the fixed cavity 521, providing the main support for the tooth holder 2 and preventing it from shaking significantly during cutting. The connecting part 524 passes through the extended cavity 522, tightly connecting the fixing part 523 and the mounting part 525, ensuring that all parts of the tooth holder 2 work together. The mounting part 525 fixes the cutting tooth 3 through a through hole. The fixing method between the cutting tooth 3 and the mounting part 525 is existing technology, so the method of fixing will not be elaborated further. This fixing method ensures that the cutting tooth 3 can accurately impact and crush coal and stone during operation.

[0039] The above connection method allows the tooth holder 2 to fit tightly with the mounting groove 52, which structurally ensures the stability of the cutting tooth 3 installation. This enables the cutting tooth 3 to maintain an accurate position during the high-speed rotation cutting process of the cutting head, improving cutting accuracy and reliability, and ultimately enhancing the working performance and efficiency of the cutting head.

[0040] Furthermore, such as Figure 4-7 As shown, the cutting head body 1 is equipped with a water supply pipe 7 that connects to an external water supply module, such as... Figure 3 As shown, the water supply pipeline 7 includes a connecting cavity 12 disposed in the cutting head body 1. A sealing cover 13 is disposed in the connecting cavity 12. A water storage space 14 connected to an external water supply module is formed between the sealing cover 13 and the connecting cavity 12. The water storage space 14 is connected to the water outlet 71.

[0041] The external water supply module is existing technology. It is fixedly connected to the middle of the sealing cover 13 of the cutting head body 1 through a pipe and is connected to the water storage space 14. In order to ensure that the water flow can be evenly supplied to each outlet 71, a threaded water channel 15 is provided on the side of the sealing cover 13 that fits against the inner wall of the connecting cavity 12. The outlet 71 is located on the path of the water channel 15.

[0042] Meanwhile, several nozzle assemblies 82 connected to the water supply pipe 7 are provided on the connecting seat 5, and the nozzle assemblies 82 are arranged on the periphery of the toothed seat 2. Specifically, as shown... Figure 4As shown, water spray seats 8 are provided on both sides of the connecting seat 5. A water storage chamber 81 connected to the water supply pipeline 7 is provided inside the water spray seat 8. Several mounting holes connected to the water storage chamber 81 are provided on the side of the water spray seat 8 facing the working surface of the cutting tooth 3. The nozzle assembly 82 is installed in the mounting holes and connected to the water supply pipeline 7 through the water storage chamber 81.

[0043] like Figure 5-7 As shown, the water supply pipeline 7 includes several outlets 71 that are installed through the cutting head body 1 and correspond to the connecting seat 5. The bottom of the fixed cavity 521 is provided with a water outlet 72 that communicates with the outlets 71. The inner wall of the fixed cavity 521 is provided with a flow channel 73 that communicates with the water storage cavity 81. It also includes a transfer groove 74 installed at the bottom of the fixed part 523 and a water passage groove 75 that connects the transfer groove 74 and the flow channel 73. The transfer groove 74 corresponds to the position of the water outlet 72. When the fixed part 523 is locked in the fixed cavity 521, the water outlet 72 and the flow channel 73 are interconnected.

[0044] When the cutting head is working, the external water supply module starts to supply water to the water supply pipe 7 inside the cutting head body 1. The water first enters the water storage space 14 inside the cutting head body 1, then enters the water passage 15 from the water storage space 14, and then enters the water outlet 71 in the water supply pipe 7, which is set on the cutting head body 1 and corresponds to the connecting seat 5.

[0045] At this time, since the fixing part 523 is stuck in the fixing cavity 521, the water inlet 72, which is connected to the water outlet 71 at the bottom of the fixing cavity 521, will introduce water into the transfer groove 74 at the bottom of the fixing part 523. The transfer groove 74 will then transport the water through the water passage 75 to the flow channel 73, which is connected to the water storage cavity 81 on the inner wall of the fixing cavity 521, and then flow into the water storage cavity 81 in the spray seat 8. The water in the water storage cavity 81 is finally sprayed out from the nozzle assembly 82, which is connected to the water storage cavity 81 and is installed in the mounting hole on the side of the spray seat 8 facing the working face of the cutting tooth 3, forming a water mist around the tooth seat 2. The water mist can effectively suppress the dust generated at the moment when the cutting tooth 3 cuts the coal and stone, greatly reduce the dust content in the working environment, effectively improve working conditions, and protect the health of the workers. Meanwhile, the water mist sprayed by the nozzle assembly 82 on the connecting seat 5 can also cool each cutting tooth 3, reduce the high temperature generated by the cutting tooth 3 due to long-term friction with coal and stone, slow down the wear rate of the cutting tooth 3, thereby extending the service life of the cutting tooth 3 and improving the overall working efficiency and stability of the cutting head.

[0046] Furthermore, the water supply pipeline 7 is connected to the water storage chamber 81 through a series of structures including the outlet 71, the through outlet 72, the transfer trough 74, the water passage 75, and the flow channel 73, forming a complete and efficient water supply network. This design allows staff to quickly expose the outlet 71 to the outside by disassembling the toothed seat 2 when cleaning the water supply pipeline, thus facilitating cleaning and unblocking of the outlet 71 and the water supply pipeline, saving maintenance time and labor costs, and making equipment maintenance work more efficient and smooth.

[0047] And such Figure 4-5 As shown, the periphery of the fixing part 523 is provided with an outwardly protruding, arc-shaped sealing surface 6, and the inner wall of the fixing cavity 521 is fitted with the sealing surface 6. The outwardly protruding, arc-shaped sealing surface 6 of the fixing part 523, in contact with the inner wall of the fixing cavity 521, forms a sealing structure. This design utilizes the close contact between the arc-shaped sealing surface 6 and the inner wall of the fixing cavity 521, and by taking advantage of the protruding characteristic of the sealing surface 6, it can better fill the gap between the two, thereby preventing liquid or impurities from penetrating through the gap between the fixing part 523 and the fixing cavity 521.

[0048] The water spray base 8 is provided with a mounting surface 9 perpendicular to the length direction of the cutting tooth 3. The mounting hole is provided on the mounting surface 9. A protective plate 10 can also be detachably provided on the mounting surface 9. The protective plate 10 is provided with a guide port 11, which can guide the water mist spraying direction of the nozzle assembly 82.

[0049] The mounting surface 9 on the water spray base 8, perpendicular to the length direction of the cutting teeth 3, provides a stable and directional mounting base for the mounting holes and the nozzle assembly 82. The protective plate 10 is detachably mounted on this surface, providing protection for the nozzle assembly 82. The guide port 11 on the protective plate 10, based on fluid dynamics principles, uses a specific shape and angle to change the initial direction of the water mist sprayed from the nozzle assembly 82, ensuring it sprays in the direction set by the guide port 11. In this embodiment, the guide port 11 can be tilted and concentrated towards the cutting teeth 3, thereby more effectively cooling the cutting teeth 3 and precisely spraying water to remove dust from the working area of ​​the cutting teeth 3.

[0050] Working principle:

[0051] After the rock excavator starts, it drives the cutting head to rotate. The toothed seats 2 and cutting teeth 3 on the surface of the cutting head body 1 rotate accordingly, impacting and crushing the coal and stone. The connection method between the toothed seats 2 and the cutting head body 1 has been improved. Several seat grooves 4 are distributed in a spiral shape along the length of the cutting head on the circumferential surface of the cutting head body 1. The seat grooves 4 are used to position the connecting seat 5, which facilitates its welding with the cutting head body 1. When subjected to impact, the force can be distributed to the cutting head body 1, reducing the stress at the weld and preventing cracking. The seat body 51 of the connecting seat 5 is fixed in the seat groove 4. The mounting groove 52 on the seat body 51 engages with the tooth seat 2. The mounting groove 52 has an opening 53 and a locking structure 54, which consists of a lower rectangular fixing cavity 521 and an upper extending cavity 522. The fixing part 523, connecting part 524 and mounting part 525 of the tooth seat 2 are respectively adapted to it. This design makes the tooth seat 2 easy to install and does not require a complicated disassembly process when replacing it, thus improving maintenance efficiency. The locking structure 54 prevents the tooth seat 2 from falling out. The reinforcing block 55 enhances the structural strength of the connecting seat 5 and ensures the stable operation of the cutting head.

[0052] When the cutting head is working, the external water supply module supplies water to the water supply pipe 7 inside the cutting head body 1. The water first enters the water storage space 14 formed by the sealing cover 13 and the connecting cavity 12 inside the cutting head body 1, and then flows evenly into the outlet 71 corresponding to the connecting seat 5 through the threaded water channel 15 on one side of the inner wall of the connecting cavity 12, which is attached to the sealing cover 13. Since the fixing part 523 is stuck in the fixing cavity 521, the water inlet 72 at the bottom of the fixing cavity 521, which is connected to the outlet 71, introduces the water into the transfer groove 74 at the bottom of the fixing part 523. The transfer groove 74 transports the water to the flow channel 73 on the inner wall of the fixing cavity 521, which is connected to the water storage cavity 81, through the water passage 75. The water flows into the water storage cavity 81 inside the spray seat 8, and finally sprays out from the spray seat 8 toward the nozzle assembly 82 in the mounting hole on the working surface side of the cutting tooth 3, forming a water mist around the tooth seat 2. This process uses the interconnected structure of each channel to build a water supply network to realize the internal spray function.

[0053] Furthermore, the sealing surface 6, which protrudes outward and is arc-shaped from the periphery of the fixing part 523, fits against the inner wall of the fixing cavity 521 to form a sealing structure, preventing liquid or impurities from penetrating. The mounting surface 9 on the water spray base 8, which is perpendicular to the length direction of the cutting teeth 3, provides a stable mounting base for the nozzle assembly 82. The removable protective plate 10 protects the nozzle assembly 82. Based on the principles of fluid mechanics, the guide port 11 on the protective plate 10 changes the direction of water mist spraying through a specific shape and angle, tilting and concentrating it towards the cutting teeth 3, thereby more effectively cooling the cutting teeth 3 and precisely spraying water to remove dust.

[0054] In the accompanying drawings of this embodiment, the same or similar reference numerals correspond to the same or similar components. In the description of this application, it should be understood that if terms such as "upper," "lower," "left," and "right" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, they are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the accompanying drawings are only for illustrative purposes and should not be construed as limiting this patent. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0055] The above are merely preferred embodiments of this application and are not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. An internal jetting cutting head comprising a cutting head body (1), a number of tooth holders (2) and cutting teeth (3) arranged on the tooth holders (2), characterized in that, The cutting head body (1) is provided with a plurality of seat grooves (4) and connecting seats (5) arranged in the seat grooves (4). The plurality of seat grooves (4) are arranged on the circumferential surface of the cutting head body (1) and are distributed in a threaded manner along the length direction of the cutting head. The connecting seat (5) comprises a seat body (51) fixedly arranged in the seat groove (4), and the seat body (51) is provided with a mounting groove (52) engaged with the tooth seat (2). An opening (53) is arranged at one end of the mounting groove (52) facing the working surface of the cutting pick (3), and a locking structure (54) is arranged at the opening (53). A reinforcing block (55) is further arranged at the end of the seat body (51) away from the opening (53), and the reinforcing block (55) is fixedly connected with the seat body (51) and is arranged in close contact with the surface of the cutting head body (1).

2. An internal jetting cutting head according to claim 1, wherein The mounting groove (52) comprises a rectangularly arranged fixed cavity (521) and an extension cavity (522) arranged above the fixed cavity (521). The length and width of the fixed cavity (521) are greater than those of the extension cavity (522). The tooth seat (2) comprises a fixed part (523) arranged in the fixed cavity (521). The fixed part (523) is provided with a connecting part (524) penetrating the extension part. The connecting part (524) is provided with a mounting part (525) with a through hole. The cutting pick (3) is fixedly arranged in the through hole of the mounting part (525).

3. An internal jetting cutting head according to claim 2, wherein, The circumferential side of the fixed part (523) is provided with an outwardly protruding sealing surface (6). The inner wall of the fixed cavity (521) is arranged in close contact with the sealing surface (6).

4. An internal jetting cutting head according to claim 2 or 3, wherein, A water supply pipeline (7) connected with an external water supply module is arranged in the cutting head body (1). A plurality of spray head assemblies (82) connected with the water supply pipeline (7) are arranged on the connecting seat (5). The plurality of spray head assemblies (82) are arranged on the circumferential side of the tooth seat (2).

5. An internal jetting cutting head according to claim 4, wherein, Water spray seats (8) are arranged on both sides of the connecting seat (5). A water storage cavity (81) in communication with the water supply pipeline (7) is arranged in the water spray seat (8). A plurality of mounting holes in communication with the water storage cavity (81) are arranged on one side of the water spray seat (8) facing the working surface of the cutting pick (3). The spray head assemblies (82) are arranged in the mounting holes and are in communication with the water supply pipeline (7) through the water storage cavity (81).

6. An internal jetting cutting head according to claim 5, wherein, The water supply pipeline (7) comprises a plurality of water outlets (71) arranged through the cutting head body (1) and corresponding to the connecting seat (5). A water passing opening (72) in communication with the water outlet (71) is arranged at the bottom of the fixed cavity (521). A flow channel (73) in communication with the water storage cavity (81) is arranged on the inner wall of the fixed cavity (521). A transfer groove (74) arranged at the bottom of the fixed part (523) and a water passing groove (75) connecting the transfer groove (74) and the flow channel (73) are further arranged. The transfer groove (74) corresponds to the position of the water passing opening (72). When the fixed part (523) is clamped in the fixed cavity (521), the water passing opening (72) and the flow channel (73) are in communication with each other.

7. An internal jetting cutting head according to claim 5, wherein, The water spraying seat (8) is provided with a mounting surface (9) perpendicular to the length direction of the cutting tooth (3), mounting holes are arranged on the mounting surface (9), and a protection plate (10) is detachably arranged on the mounting surface (9), the protection plate (10) is provided with a guide opening (11), and the guide opening (11) can guide the water mist spraying direction of the nozzle assembly (82).

8. An internal jetting cutting head according to claim 3, wherein, The sealing surface (6) is in a circular arc shape.

9. An internal jetting cutting head according to claim 1, wherein, The locking structure (54) comprises a locking block (541) arranged at the opening (53), and the locking block (541) is connected and fixed with the connecting seat (5) through a bolt.

10. An internal jetting cutting head according to claim 6, wherein The water supply pipeline (7) comprises a connecting cavity (12) arranged in the cutting head body (1), a sealing cover (13) is arranged in the connecting cavity (12), a water storage space (14) connected with an external water supply module is formed between the sealing cover (13) and the connecting cavity (12), and the water storage space (14) is in communication with the water outlet (71).

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