Coal mine tunneling cutting head device

Abstract

The invention relates to the technical field of coal mine tunneling equipment, in particular to a coal mine tunneling cutting head device which comprises a cutting head body and a damping mechanism, and a cavity is formed in the cutting head body; the damping mechanism is arranged in the cavity and comprises an inner rod extending in the axial direction of the cutting head body and a radial damping assembly arranged on the inner rod, the radial damping assembly is connected with the inner surface of the cavity, and one end of the inner rod penetrates through the cutting head body and is connected with the coupler; according to the coal mine tunneling cutting head device, vibration is effectively prevented from being transmitted to follow-up equipment such as the tunneling arm, the reliability of a tunneling system is remarkably improved, and the service life of the tunneling system is remarkably prolonged.

Description

Technical Field

[0001] This invention relates to the field of coal mine tunneling equipment technology, and in particular to a coal mine tunneling cutting head device. Background Technology

[0002] The cutting head is a core working component of mining equipment such as tunnel boring machines and coal mining machines. It mainly uses rotary motion to drive surface cutting teeth to crush, cut, and strip geological media such as rocks and coal seams. The cutting head is connected to the tunneling arm through a coupling and bears complex loads during high-speed rotary cutting.

[0003] Existing cutting head devices suffer from vibration transmission problems during operation: when breaking hard rock strata, the cutting head generates strong radial vibrations and impact loads. These vibrations are directly transmitted to downstream equipment such as the tunneling arm, drive motor, and reducer through the rigid connection between the cutting head body and the coupling. Due to the lack of effective radial damping measures, the cutting head body and the tunneling arm cannot buffer and attenuate the radial vibrations, resulting in the vibration energy being completely transferred to other components of the tunneling system.

[0004] Prolonged vibration and impact can cause problems such as loosening of connectors, accelerated bearing wear, and fatigue damage to equipment, seriously affecting the reliability and service life of the entire tunneling system, increasing maintenance costs and failure rates, and reducing tunneling efficiency. This vibration transmission problem is particularly prominent in working conditions with complex geological conditions and high rock hardness.

[0005] Therefore, there is a need for a cutting head device that can incorporate a radial damping mechanism inside the cutting head body to effectively attenuate the transmission of radial vibration to the tunneling arm and protect the tunneling equipment from excessive vibration damage. Summary of the Invention

[0006] This invention provides a coal mine tunneling cutting head device, which effectively prevents vibration from being transmitted to subsequent equipment such as the tunneling arm, and significantly improves the reliability and service life of the tunneling system.

[0007] This invention provides a coal mine tunneling cutting head device, comprising: a cutting head body, the inside of which is provided with a cavity; a shock absorption mechanism disposed within the cavity, the shock absorption mechanism including an inner rod extending axially along the cutting head body and a radial shock absorption assembly disposed on the inner rod, the radial shock absorption assembly being connected to the inner surface of the cavity, one end of the inner rod penetrating the cutting head body and being connected to a coupling; wherein, the coupling is connected to the tunneling arm.

[0008] In one possible implementation, the radial damping assembly includes: a collar fitted around the outer periphery of the inner rod; and a plurality of first elastic connectors spaced apart circumferentially along the collar, wherein the ends of the plurality of first elastic connectors away from the collar are connected to the inner surface of the cavity via a mounting plate.

[0009] In one possible implementation, the side of the mounting plate away from the collar is an arc-shaped structure, which matches the curvature of the inner surface of the cavity.

[0010] In one possible implementation, multiple radial damping components are provided, with the multiple radial damping components spaced apart along the axial direction of the inner rod.

[0011] In one possible implementation, the damping mechanism further includes an axial damping component connected to the radial damping component and disposed adjacent to the coupling.

[0012] In one possible implementation, the axial damping assembly includes a plurality of second elastic connectors spaced circumferentially along the inner rod. One end of each second elastic connector is connected to a collar, and the other end is connected to the rear end plate of the cutting head body.

[0013] In one possible implementation, the axial end of the cutting head body is provided with a pick-and-place port communicating with the cavity, a limit plate is provided at the pick-and-place port, and the second elastic connector is connected to the limit plate.

[0014] In one possible implementation, both the first elastic connector and the second elastic connector include a telescopic sleeve and a shock-absorbing spring sleeved around the outer periphery of the telescopic sleeve.

[0015] In one possible implementation, the cavity, coupling, and inner rod are arranged coaxially.

[0016] In one possible implementation, a drill bit mechanism is also included, which is located at the end of the cutting head body away from the coupling. The drill bit mechanism includes: a hydraulic cylinder disposed in a cavity, with a push rod at the output end of the hydraulic cylinder, the push rod extending axially along the cutting head body and passing through the front end plate of the cutting head body; and a drill bit body connected to the end of the push rod.

[0017] In one possible implementation, a device ring is provided on the push rod, and the drill bit body is detachably connected to the push rod via the device ring.

[0018] In one possible implementation, the coupling includes a rotating collar and a connecting ring connected to the rotating collar, the connecting ring being fixedly connected to the inner rod.

[0019] In one possible implementation, a threaded ring is provided on the outer peripheral surface of the cutting head body, and multiple sprayers are provided on the threaded ring.

[0020] The coal mine tunneling cutting head device provided by this invention effectively solves the technical problem of damage to tunneling equipment caused by direct vibration transmission in the prior art by setting a special vibration damping mechanism inside the cutting head body. Specifically, when the cutting head generates radial vibration and impact loads while breaking hard rock strata, these vibrations first act on the cutting head body and then are transmitted to the vibration damping mechanism set in the cavity. The radial vibration damping component in the vibration damping mechanism is directly connected to the inner surface of the cavity, and can receive and absorb the radial vibration energy from the cutting head body, converting the vibration energy into elastic potential energy through elastic deformation and gradually dissipating it. The inner rod, as the core component of the force transmission path, extends along the axial direction of the cutting head body and passes through the cutting head body to connect with the coupling. Under the protection of the radial vibration damping component, the inner rod mainly transmits the load after vibration damping to the coupling, which significantly reduces the vibration amplitude transmitted to the tunneling arm. This built-in vibration damping design enables in-situ attenuation of vibration within the cutting head body, preventing vibration energy from directly impacting critical equipment such as the tunneling arm and drive motor through rigid connection paths. This effectively reduces problems such as loose connections, bearing wear, and equipment fatigue damage, significantly improving the reliability and service life of the tunneling system and reducing maintenance costs and failure rates. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in this invention 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 some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the structure of a coal mine tunneling cutting head device provided by the present invention when the cutting head body is cut open.

[0023] Figure 2 yes Figure 1 A magnified schematic diagram of the structure at point A.

[0024] Figure 3 This is a three-dimensional structural diagram of a coal mine tunneling cutting head device provided by the present invention.

[0025] Figure 4 This is an exploded structural diagram of a cutting head body and a drill bit mechanism provided by the present invention.

[0026] Figure 5 This is a three-dimensional structural diagram of a drill bit mechanism provided by the present invention.

[0027] Figure label: 1. Cutting head body; 11. Cavity; 12. Limiting plate; 13. Threaded ring; 14. Sprayer; 2. Vibration damping mechanism; 21. Inner rod; 22. Radial vibration damping assembly; 221. Collar; 222. First elastic connector; 223. Mounting plate; 23. Axial vibration damping assembly; 231. Second elastic connector; 3. Coupling; 31. Shaft collar; 32. Connecting ring; 4. Drill bit mechanism; 41. Hydraulic cylinder; 42. Push rod; 421. Equipment ring; 43. Drill bit body. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0029] The following is combined Figures 1-5 This invention describes a coal mine tunneling cutting head device, comprising: a cutting head body 1, the inside of which is provided with a cavity 11; a shock absorption mechanism 2, disposed within the cavity 11, the shock absorption mechanism 2 including an inner rod 21 extending axially along the cutting head body 1 and a radial shock absorption component 22 disposed on the inner rod 21, the radial shock absorption component 22 being connected to the inner surface of the cavity 11, one end of the inner rod 21 penetrating the cutting head body 1 and being connected to a coupling 3; wherein, the coupling 3 is connected to the tunneling arm.

[0030] In this invention, a specialized damping mechanism 2 is installed inside the cutting head body 1, effectively solving the technical problem of damage to tunneling equipment caused by direct vibration transmission in the prior art. Specifically, when the cutting head generates radial vibration and impact loads while breaking hard rock strata, these vibrations first act on the cutting head body 1 and are then transmitted to the damping mechanism 2 installed in the cavity 11. The radial damping component 22 in the damping mechanism 2 is directly connected to the inner surface of the cavity 11, and can receive and absorb the radial vibration energy from the cutting head body 1, converting the vibration energy into elastic potential energy through elastic deformation and gradually dissipating it. The inner rod 21, as the core component of the force transmission path, extends along the axial direction of the cutting head body 1 and passes through the cutting head body 1 to connect with the coupling 3. Under the protection of the radial damping component 22, the inner rod 21 mainly transmits the load after damping treatment to the coupling 3, significantly reducing the vibration amplitude transmitted to the tunneling arm. This built-in vibration damping design enables in-situ attenuation of vibration within the cutter head body 1, preventing vibration energy from directly impacting critical equipment such as the tunneling arm and drive motor through rigid connection paths. This effectively reduces problems such as loose connections, bearing wear, and equipment fatigue damage, significantly improving the reliability and service life of the tunneling system and reducing maintenance costs and failure rates.

[0031] Specifically, the inner rod 21 extends axially along the cutting head body 1, ensuring the directness and effectiveness of the force transmission path. The radial damping component 22 is set on the inner rod 21 and connected to the inner surface of the cavity 11, forming a radial elastic support structure. This structure can provide damping and buffering while ensuring the force transmission function. One end of the inner rod 21 passes through the cutting head body 1 and is connected to the coupling 3, realizing the force transmission after damping.

[0032] In one specific embodiment, during coal mine tunneling operations, the cutting head rotates at high speed to cut hard rock layers, and the resulting strong vibrations and impacts are effectively controlled by the damping mechanism 2. The vibration amplitude is significantly reduced before being transmitted to the tunneling arm and drive system, protecting these critical devices from excessive vibration damage.

[0033] In related technologies, the cutting head is usually directly connected to the coupling 3, lacking effective vibration reduction measures. The strong vibrations generated during the cutting operation will be directly transmitted to the cutting arm, drive motor and other equipment. Under long-term action, this can easily lead to problems such as loosening of the connecting parts, accelerated bearing wear, and fatigue damage of the equipment.

[0034] In this embodiment of the invention, by setting a special damping mechanism 2 inside the cutting head body 1, a complete damping and force transmission system is established, which effectively blocks the direct transmission path of vibration, greatly reduces the vibration intensity transmitted to downstream equipment, extends the service life of the entire tunneling system, and reduces maintenance costs and failure rate.

[0035] like Figure 2 As shown, in some embodiments, the radial damping assembly 22 includes: a collar 221 sleeved on the outer periphery of the inner rod 21; a plurality of first elastic connectors 222 spaced apart along the circumference of the collar 221, and one end of the plurality of first elastic connectors 222 away from the collar 221 being connected to the inner surface of the cavity 11 via a mounting plate 223.

[0036] In this invention, the radial damping component 22 includes a collar 221 and a plurality of first elastic connectors 222. The collar 221 is sleeved on the outer periphery of the inner rod 21, providing an installation base for the first elastic connectors 222. The plurality of first elastic connectors 222 are spaced apart circumferentially along the collar 221, achieving uniform distribution of radial load. The end of the first elastic connector 222 away from the collar 221 is connected to the inner surface of the cavity 11 through the mounting plate 223, forming a stable radial elastic support structure. This multi-point support method can effectively cope with radial impact forces from different directions.

[0037] Specifically, the collar 221, as an intermediate force transmission component, distributes the load from the inner rod 21 to multiple first elastic connectors 222. The circumferentially spaced distribution of the multiple first elastic connectors 222 ensures the uniformity of the force and avoids the problem of excessive force at a single point. The mounting plate 223, as a connecting medium, transmits the elastic force of the first elastic connectors 222 to the inner surface of the cavity 11 of the cutting head body 1, thus achieving an effective combination of shock absorption force and structure.

[0038] In one specific embodiment, when the cutting head breaks up uneven rock strata, it will generate irregular impacts in various directions. Through the circumferential distribution of multiple first elastic connectors 222, these impacts from different directions can be elastically absorbed accordingly, avoiding the phenomenon that the impact in one direction is too large while the support in other directions is insufficient.

[0039] In this embodiment of the invention, the design of multiple first elastic connectors 222 distributed circumferentially achieves radial all-round elastic support, which can effectively buffer impacts from any direction, improve the reliability and adaptability of the shock absorption system, and ensure stable shock absorption effect under various complex working conditions.

[0040] like Figure 2 As shown, in some embodiments, the side of the mounting plate 223 away from the collar 221 is an arc-shaped structure, which matches the curvature of the inner surface of the cavity 11.

[0041] In this invention, the side of the mounting plate 223 away from the collar 221 is designed as an arc surface structure. This arc surface structure matches the curvature of the inner surface of the cavity 11. By increasing the contact area, the stress is evenly distributed, avoiding stress concentration that may occur with point contact or line contact. The arc surface structure design enables the mounting plate 223 to form good surface contact with the inner surface of the cavity 11, improving the connection strength and force transmission efficiency.

[0042] Specifically, the matching of the arc structure with the curvature of the inner surface of the cavity 11 means that the two curved surfaces can fit tightly together to form a large area of ​​uniform contact. This contact method disperses the concentrated force transmitted by the first elastic connector 222 to a larger area, significantly reducing the stress per unit area. The arc design of the mounting plate 223 can also adapt to the geometry of the inner surface of the cavity 11, improving the installation accuracy and connection reliability.

[0043] In one specific embodiment, when the cutting head is operating under high intensity, the first elastic connector 222 bears a large radial force. Through the stress dispersion effect of the arc surface structure, these forces are evenly transmitted to the inner wall of the cavity 11 of the cutting head body 1, avoiding deformation or connection failure of the mounting plate 223 due to excessive local stress, and ensuring the stability of the shock absorption system in long-term use.

[0044] In this embodiment of the invention, the precise matching of the arc structure with the curvature of the inner surface of the cavity 11 achieves an ideal surface contact state, which greatly improves the load-bearing capacity and durability of the connection interface, extends the service life of the shock absorption system, and reduces maintenance costs caused by connection failure.

[0045] Optionally, a planar mounting portion can be provided on the inner surface of the cavity 11, and the surface of the mounting plate 223 can be provided with a planar structure and welded and fixed to the planar mounting portion.

[0046] like Figure 1 As shown, in some embodiments, multiple radial damping components 22 are provided, and the multiple radial damping components 22 are spaced apart along the axial direction of the inner rod 21.

[0047] In this invention, multiple radial damping components 22 are spaced apart along the axial direction of the inner rod 21, forming distributed damping supports at different axial positions of the cutting head body 1. Each radial damping component 22 can independently bear the radial load at its corresponding position. The multiple damping components work together to form a tiered damping effect, effectively improving the load-bearing capacity and damping efficiency of the entire damping system.

[0048] Specifically, multiple radial damping components 22 arranged axially along the inner rod 21 divide the axial length of the cutting head body 1 into several segments, each segment having corresponding radial elastic support. This distributed support method can better control the radial deformation and vibration of the cutting head body 1, avoiding the local stress concentration and insufficient support problems that may occur with single-point support. The radial damping components 22 are connected to each other through the inner rod 21 to form an integral structure.

[0049] In one specific embodiment, when the cutting head cuts large rocks or encounters hard interlayers, it generates a strong impact. Multiple radial damping components 22 can bear these impact loads in segments along the axial direction. The front damping component mainly bears the direct impact from the cutting part, while the rear damping component mainly controls the transmission of overall vibration, thus realizing reasonable distribution and effective control of the load.

[0050] In this embodiment of the invention, the axial distribution of multiple radial damping components 22 achieves full axial damping coverage, ensuring that any impact at any location can receive nearby elastic support, greatly improving the overall performance and reliability of the damping system, and effectively avoiding equipment damage caused by insufficient local damping.

[0051] like Figure 1 and 2 As shown, in some embodiments, the damping mechanism 2 further includes an axial damping component 23, which is connected to the radial damping component 22 and is disposed adjacent to the coupling 3.

[0052] In this invention, the damping mechanism 2 also includes an axial damping component 23, which is connected to the radial damping component 22 and disposed near the coupling 3, forming a three-dimensional damping system that combines radial and axial forces. The axial damping component 23 is specifically designed to deal with axial impacts and vibrations, and together with the radial damping component 22, it forms a comprehensive vibration control network, effectively improving the overall performance of the damping system.

[0053] Specifically, the axial damping component 23 is located adjacent to the coupling 3 and can provide axial buffering at key nodes of vibration transmission. Its connection with the radial damping component 22 ensures the coordinated operation of the two damping functions. The axial damping component 23 mainly bears the axial impact force from the cutting operation and prevents these impacts from being directly transmitted to the coupling 3 and the drive system. The three-dimensional damping network formed by the radial damping component 22 and the axial damping component 23 can cope with complex three-dimensional vibrations.

[0054] In one specific embodiment, the cutting head must withstand both radial cutting resistance and axial propulsion resistance during its advancement. When it encounters hard rock or obstacles, it will generate a strong axial recoil force. The axial damping component 23 can effectively absorb these axial impacts, prevent the recoil force from acting directly on the drive system, and protect key equipment such as hydraulic motors and reducers.

[0055] In this embodiment of the invention, by adding an axial damping component 23 and coordinating it with the radial damping component 22, a complete three-dimensional damping system is established. Regardless of the direction of the impact, the system can receive appropriate damping treatment, which greatly improves the impact resistance and operational stability of the entire tunneling system.

[0056] like Figure 2 As shown, in some embodiments, the axial damping assembly 23 includes a plurality of second elastic connectors 231, which are spaced apart circumferentially along the inner rod 21. One end of each second elastic connector 231 is connected to the collar 221, and the other end is connected to the rear end plate of the cutting head body 1.

[0057] In this invention, the axial damping component 23 includes a plurality of second elastic connectors 231. These connectors are spaced apart circumferentially along the inner rod 21 to form a uniform circumferential distribution. One end of each second elastic connector 231 is connected to the collar 221, and the other end is connected to the rear end plate of the cutting head body 1, thus establishing a stable axial elastic force transmission path. The plurality of second elastic connectors 231 jointly bear the axial load, avoiding the risk of overload of a single connector.

[0058] Specifically, the second elastic connector 231 is spaced circumferentially along the inner rod 21 to ensure the uniform distribution of axial load. Each connector bears a corresponding share. The connection with the collar 221 ensures that the load can be transmitted from the radial damping component 22 to the axial damping component 23. The connection with the rear end plate transmits the axial force to the cutting head body 1 structure. This double-end connection method forms a complete axial damping force transmission chain.

[0059] In one specific embodiment, the cutting head generates a strong axial rebound force when excavating in hard rock. Multiple second elastic connectors 231 can simultaneously participate in bearing and buffering the axial force, greatly reducing the stress on individual connectors and avoiding overall failure due to overload of individual connectors, thus ensuring the reliability and durability of the axial damping function.

[0060] In this embodiment of the invention, the circumferential distribution design of multiple second elastic connectors 231 achieves uniform distribution of axial load, greatly improves the load-bearing capacity and reliability of the axial damping system, effectively avoids damping failure caused by local overload, and extends the service life of the entire damping system.

[0061] like Figure 1 As shown, in some embodiments, the axial end of the cutting head body 1 is provided with a pick-up and put-out port communicating with the cavity 11, and a limit plate 12 is provided at the pick-up and put-out port, and the second elastic connector 231 is connected to the limit plate 12.

[0062] In this invention, the axial end of the cutting head body 1 is provided with a pick-up and put-out port that communicates with the cavity 11. This pick-up and put-out port provides a convenient channel for the installation and maintenance of the shock absorption mechanism 2. The limiting plate 12 provided at the pick-up and put-out port serves both as a positioning function and as the connection base of the second elastic connector 231. This design takes into account both shock absorption function and maintenance convenience, and improves the operability and practicality of the equipment.

[0063] Specifically, the access port is connected to the cavity 11, providing the necessary operating space for the installation of the shock absorber assembly. Maintenance personnel can inspect, adjust, or replace the internal shock absorber mechanism 2 through the access port. The limiting plate 12 plays a dual role of sealing and positioning at the access port, ensuring the airtightness of the cavity 11 and providing a reliable connection base for the second elastic connector 231. The access port also facilitates the quick replacement of the shock absorber assembly in case of failure.

[0064] In one specific embodiment, the mining environment is harsh, and the shock absorption components need to be inspected and maintained regularly. The working status of the shock absorption springs can be easily observed through the access port, and the connection parts can be checked for looseness or wear. If necessary, damaged parts can be quickly replaced, which greatly improves the efficiency and convenience of equipment maintenance and reduces downtime.

[0065] In this embodiment of the invention, by setting a combination structure of the pick-up and drop-out port and the limiting plate 12, the maintenance is made more convenient while ensuring the shock absorption function. Maintenance personnel can quickly and easily complete the inspection and repair of the shock absorption system, thereby improving the maintainability and economy of the equipment.

[0066] In some embodiments, the first elastic connector 222 and the second elastic connector 231 both include a telescopic sleeve and a shock-absorbing spring sleeved on the outer periphery of the telescopic sleeve.

[0067] In this invention, both the first elastic connector 222 and the second elastic connector 231 include a telescopic sleeve and a shock-absorbing spring sleeved on the outer periphery of the telescopic sleeve. The telescopic sleeve provides guiding and limiting functions to ensure that the elastic connector maintains the correct movement trajectory when subjected to force. The shock-absorbing spring provides elastic buffering. The two work together to form a composite shock-absorbing structure that combines guiding and limiting with elastic buffering, thereby improving the accuracy and stability of the shock absorption effect.

[0068] Specifically, the telescopic sleeve, as the inner core structure, provides guidance when the elastic connector is compressed or stretched, preventing the spring from shifting laterally or torsional. The damping spring is sleeved on the outer circumference of the telescopic sleeve and can be uniformly compressed or stretched under axial load. The guiding function of the telescopic sleeve ensures that the damping spring always works along the correct axis, avoiding unbalanced loading and premature failure of the spring.

[0069] In one specific embodiment, the cutting head generates irregular impact loads when operating on uneven rock surfaces. These loads may cause the damping spring to generate lateral forces. Through the guiding constraint of the telescopic sleeve, the damping spring always maintains an axial working state, avoiding spring fatigue damage caused by lateral forces and ensuring long-term stability of damping performance.

[0070] In this embodiment of the invention, the composite structure design of the telescopic sleeve and the shock-absorbing spring solves the guiding problem of the spring under complex loads, greatly improves the working reliability and service life of the elastic connector, and ensures the stability of the shock absorption system under various working conditions.

[0071] In some embodiments, the cavity 11, the coupling 3, and the inner rod 21 are coaxially arranged.

[0072] In this invention, the cavity 11, coupling 3, and inner rod 21 are coaxially arranged, which ensures the geometric concentricity of the entire transmission system and eliminates the additional bending moment and vibration caused by eccentricity. The inner rod 21, as the main force transmission axis, is coaxial with the coupling 3, ensuring the straightness of load transmission. The coaxiality of the cavity 11 with the transmission axis provides symmetrical installation space for the vibration damping components. This coaxial design improves transmission efficiency and reduces the dynamic balance requirements during operation.

[0073] Specifically, the coaxial arrangement means that the central axis of the cavity 11, the axis of the inner rod 21, and the axis of the coupling 3 coincide. No eccentric torque will be generated during load transmission. The damping components are symmetrically distributed around the central axis, and the force is uniform. The inner rod 21 maintains dynamic balance when rotating, avoiding centrifugal force and vibration caused by eccentricity. The coaxial connection of the coupling 3 reduces energy loss during transmission.

[0074] In this embodiment of the invention, the eccentricity problem is eliminated from the source by strict coaxial design requirements, ensuring the high-precision operation of the transmission system, greatly improving the operating quality and reliability of the equipment, and extending the service life of key components such as bearings and couplings.

[0075] like Figure 4 and 5 As shown, in some embodiments, a drill bit mechanism 4 is also included. The drill bit mechanism 4 is disposed at the end of the cutting head body 1 away from the coupling 3. The drill bit mechanism 4 includes: a hydraulic cylinder 41 disposed in the cavity 11, and a push rod 42 disposed at the output end of the hydraulic cylinder 41. The push rod 42 extends along the axial direction of the cutting head body 1 and passes through the front end plate of the cutting head body 1; and a drill bit body 43 connected to the end of the push rod 42.

[0076] In this invention, the drill bit mechanism 4 is located at the end of the cutting head body 1 away from the coupling 3. The drill bit body 43 is axially extended and retracted by the push rod 42 driven by the hydraulic cylinder 41. When the drill bit body 43 extends, an effective protection area is formed in front of the cutting head body 1. The gravel generated during the cutting operation will scatter around the drill bit body 43 instead of directly impacting the cutting head body 1. This active protection method effectively protects the cutting head device and surrounding equipment from gravel impact damage.

[0077] Specifically, the hydraulic cylinder 41 is installed in the cavity 11, and the push rod 42 at its output end extends axially along the cutting head body 1 and passes through the front end plate. The drill bit body 43 is connected to the end of the push rod 42. The extension length of the drill bit body 43 can be controlled by the hydraulic cylinder 41. The axial movement of the push rod 42 drives the drill bit body 43 to perform pre-crushing operation in front of the cutting head body 1. The resulting crushed stone is scattered near the drill bit body 43, avoiding large rocks from directly impacting the cutting head device.

[0078] In one specific embodiment, when the tunneling encounters hard rock formations, the drill bit body 43 first extends to pre-crush the rock, breaking large rocks into smaller fragments. These fragments are scattered around the drill bit body 43. When the cutting head body 1 then performs normal cutting, it faces the pre-processed smaller rock fragments, greatly reducing the impact threat to the cutting head body 1 and surrounding equipment.

[0079] In related technologies, the cutting head directly faces the untreated rock strata, and large pieces of rock generated during cutting are prone to random splashing, directly impacting the cutting head device, cutting arm, or drive motor, causing equipment damage, affecting tunneling efficiency, increasing maintenance costs, and posing safety hazards. However, in this embodiment of the invention, through the pre-crushing action of the drill bit mechanism 4 and the active protection design, an effective rock debris protection barrier is established, significantly reducing the probability and intensity of rock debris impact on the equipment, improving the safety and reliability of the entire tunneling system, and extending the equipment's service life.

[0080] like Figure 1 As shown, in some embodiments, the push rod 42 is provided with a device ring 421, and the drill bit body 43 is detachably connected to the push rod 42 through the device ring 421.

[0081] In this invention, the device ring 421 provided on the push rod 42 enables the detachable connection between the drill bit body 43 and the push rod 42. This connection method not only ensures reliable force transmission between the drill bit body 43 and the push rod 42, but also provides the convenience of quick assembly and disassembly. The device ring 421 can also play a buffering role, reducing the rigid impact between the drill bit body 43 and the push rod 42, and extending the service life of the connection part.

[0082] Specifically, the device ring 421 serves as an intermediate connector, which is fixedly connected to the push rod 42 on one hand and provides a connection interface for the drill bit body 43 on the other. The detachable connection means that the drill bit body 43 can be replaced separately without disassembling the entire push rod 42 system. The buffering effect of the device ring 421 can absorb the impact force generated by the drill bit body 43 during the crushing operation, and prevent these impacts from being directly transmitted to the push rod 42 and the hydraulic cylinder 41.

[0083] In some embodiments, the coupling 3 includes a rotating collar 31 and a connecting ring 32 connected to the rotating collar 31, the connecting ring 32 being fixedly connected to the inner rod 21.

[0084] In this invention, the coupling 3 includes a rotating shaft ring 31 and a connecting ring 32 connected to the rotating shaft ring 31. The connecting ring 32 is fixedly connected to the inner rod 21. This split structure design realizes the professional division of functions. The rotating shaft ring 31 is specifically responsible for the connection with the tunneling arm and power transmission, while the connecting ring 32 is specifically responsible for the fixed connection with the inner rod 21. The split design facilitates processing, manufacturing, assembly, and maintenance, and improves the overall performance and reliability of the coupling 3.

[0085] Specifically, the rotating shaft ring 31, as an external component, undertakes the connection function with the drive system of the tunneling equipment, while the connecting ring 32, as an internal component, is responsible for the fixed connection with the inner rod 21 of the cutting head device. The separate design of the two components allows each component to be optimized for its specific function. The rotating shaft ring 31 can adopt a structure and materials suitable for transmission connection, while the connecting ring 32 can adopt a structure and materials suitable for fixed connection.

[0086] like Figure 3 As shown, in some embodiments, a threaded ring 13 is provided on the outer peripheral surface of the cutting head body 1, and multiple sprayers 14 are provided on the threaded ring 13.

[0087] In this invention, a threaded ring 13 is provided on the outer peripheral surface of the cutting head body 1, and multiple sprayers 14 are provided on the threaded ring 13. The design of the threaded ring 13 increases the outer surface area of ​​the cutting head body 1, improves the frictional contact effect with the surrounding rock, and provides a stable installation base for the sprayers 14. The setting of multiple sprayers 14 can carry out comprehensive dust reduction and cooling treatment in the cutting area, improve the working environment, and extend the service life of the cutting teeth and equipment.

[0088] Specifically, the spiral structure of the threaded ring 13 increases the contact area between the cutting head body 1 and the rock, improving cutting efficiency. The thread also acts as a guide, which helps to discharge the crushed stone. The sprayer 14 is installed on the threaded ring 13 and can achieve optimized distribution of spray coverage according to the direction of the thread. Multiple sprayers 14 working together can effectively spray water mist over the entire cutting area.

[0089] In one specific embodiment, the dust concentration and temperature are high during coal mine tunneling operations. Multiple sprayers 14 can spray water to the cutting area in a timely manner to reduce dust and lower the temperature, effectively controlling the generation and spread of dust, reducing the cutting temperature, protecting the cutting teeth from overheating damage, improving the working environment of the workers, and enhancing the safety of the operation.

[0090] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without any creative effort.

[0091] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A coal mine tunneling cutting head device, characterized in that, include: The cutting head body (1) has a cavity (11) inside. A damping mechanism (2) is disposed in the cavity (11). The damping mechanism (2) includes an inner rod (21) extending axially along the cutting head body (1) and a radial damping component (22) disposed on the inner rod (21). The radial damping component (22) is connected to the inner surface of the cavity (11). One end of the inner rod (21) passes through the cutting head body (1) and is connected to the coupling (3). The coupling (3) is connected to the tunneling arm.

2. The coal mine tunneling cutting head device according to claim 1, characterized in that, The radial damping assembly (22) includes: A collar (221) is fitted onto the outer periphery of the inner rod (21); Multiple first elastic connectors (222) are spaced apart circumferentially along the collar (221), and one end of each first elastic connector (222) away from the collar (221) is connected to the inner surface of the cavity (11) via a mounting plate (223).

3. The coal mine tunneling cutting head device according to claim 2, characterized in that, The side of the mounting plate (223) away from the collar (221) is an arc surface structure, which matches the curvature of the inner surface of the cavity (11).

4. The coal mine tunneling cutting head device according to claim 2, characterized in that, The damping mechanism (2) further includes an axial damping component (23), which is connected to the radial damping component (22) and is disposed adjacent to the coupling (3).

5. The coal mine tunneling cutting head device according to claim 4, characterized in that, The axial damping assembly (23) includes a plurality of second elastic connectors (231), which are spaced apart circumferentially along the inner rod (21). One end of each second elastic connector (231) is connected to the collar (221), and the other end is connected to the rear end plate of the cutting head body (1).

6. The coal mine tunneling cutting head device according to claim 5, characterized in that, The axial end of the cutting head body (1) is provided with a pick-up and put-out port communicating with the cavity (11), and a limit plate (12) is provided at the pick-up and put-out port. The second elastic connector (231) is connected to the limit plate (12).

7. The coal mine tunneling cutting head device according to claim 2, characterized in that, The cavity (11), the coupling (3), and the inner rod (21) are coaxially arranged.

8. The coal mine tunneling cutting head device according to any one of claims 1-7, characterized in that, It also includes a drill bit mechanism (4), which is located at one end of the cutting head body (1) away from the coupling (3), and the drill bit mechanism (4) includes: A hydraulic cylinder (41) is disposed in the cavity (11). A push rod (42) is provided at the output end of the hydraulic cylinder (41). The push rod (42) extends along the axial direction of the cutting head body (1) and passes through the front end plate of the cutting head body (1). The drill bit body (43) is connected to the end of the push rod (42).

9. The coal mine tunneling cutting head device according to claim 8, characterized in that, The push rod (42) is provided with an equipment ring (421), and the drill bit body (43) is detachably connected to the push rod (42) through the equipment ring (421).

10. The coal mine tunneling cutting head device according to any one of claims 1-7, characterized in that, The coupling (3) includes a rotating collar (31) and a connecting ring (32) connected to the rotating collar (31), and the connecting ring (32) is fixedly connected to the inner rod (21).

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