Water-guided laser jet device with hydraulic pressure change monitoring function

Abstract

The present invention provides a water-guided laser jetting device with a hydraulic change monitoring function, which relates to the field of water-guided lasers and includes an upper end cover, a first accommodating cavity provided on the lower surface, and a first through hole provided on the upper surface; a cover plate fixing member arranged in the first through hole, a transparent cover plate provided below the cover plate fixing member, a first force pushing the transparent cover plate downward is exerted between the cover plate fixing member and the transparent cover plate, and a detection unit for detecting the distance between the cover plate fixing member and the transparent cover plate is further provided between the cover plate fixing member and the transparent cover plate; a lower end cover arranged in the first accommodating cavity, a pressure stabilizing cavity provided on the upper surface of the lower end cover for liquid to flow from the edge of the lower end cover to the center, and after the liquid flows through the pressure stabilizing cavity, a second upward force is exerted on the transparent cover plate at the center of the lower end cover; a nozzle arranged in the center of the lower end cover for spraying liquid at the center of the lower end cover; a liquid inlet channel connected to the pressure stabilizing cavity, and the present application converts a distance signal into a pressure signal output, thereby greatly improving the accuracy and reliability of monitoring.

Description

Technical Field

[0001] The invention relates to the field of water-guided lasers, and in particular to a water-guided laser jetting device with a hydraulic pressure change monitoring function. Background Art

[0002] Laser microjet processing technology, also known as water-guided laser, is based on the principle of optical fiber propagation. It is based on the principle that laser can be totally reflected in a water beam. The energy of the laser is limited to a micro-water flow with a diameter of 20 to 100 μm, and the laser is guided by the micro-water flow to process the workpiece.

[0003] In a water-guided laser system, generating a stable, qualified water jet is a key factor in laser-water jet coupling. The water jet formation process can be affected by various factors, such as the liquid pressure and flow rate within the jetting device. These factors can affect the water jet's ability to form a reverse-flow nozzle and its stable length. The water-guided laser jetting device is a direct contact device that generates a stable water jet, so monitoring pressure changes within the jetting device is crucial in a water-guided laser system.

[0004] Traditional monitoring methods include optical monitoring systems and visual monitoring systems. Optical detection systems analyze and monitor various light signals generated during processing, while visual monitoring systems use cameras to capture images of the processed parts in real time to obtain surface information.

[0005] During the water-guided laser processing process, a large amount of water mist is generated. This water mist forms near the laser focus. Optical monitoring is affected by the scattering of the water mist, significantly reducing monitoring accuracy and reliability. Visual monitoring systems, affected by the water mist, have difficulty obtaining a clear image of the processing area. Therefore, neither monitoring method can accurately capture pressure changes within the injection device. Summary of the Invention

[0006] The present invention provides a water-guided laser jetting device with a hydraulic pressure change monitoring function, which aims to solve the problem that the existing technology cannot accurately and reliably obtain the hydraulic pressure change of the jetting device.

[0007] To achieve the above objectives, an embodiment of the present invention provides a water-guided laser jetting device with a hydraulic pressure change monitoring function, comprising:

[0008] The upper end cover has a first accommodating cavity that is recessed upward on its lower surface and a first through hole formed in the axial direction on its upper surface;

[0009] a cover plate fixing member disposed in the first through hole, a transparent cover plate being disposed below the cover plate fixing member, a first acting force being exerted between the cover plate fixing member and the transparent cover plate, the first acting force pushing the transparent cover plate downward, a detection unit being further disposed between the cover plate fixing member and the transparent cover plate, the detection unit detecting a distance between the cover plate fixing member and the transparent cover plate;

[0010] a lower end cover disposed in the first accommodating cavity, wherein the upper surface of the lower end cover is located below the transparent cover plate, and a pressure stabilizing cavity is provided on the upper surface of the lower end cover for liquid to flow from the edge of the lower end cover to the center of the lower end cover, wherein the liquid exerts a second upward force on the transparent cover plate at the center of the lower end cover after flowing through the pressure stabilizing cavity;

[0011] A nozzle is provided at the center of the lower end cover, and is used to spray the liquid at the center of the lower end cover;

[0012] The liquid inlet channel is opened on the side of the upper end cover and is communicated with the pressure stabilizing chamber.

[0013] Preferably, the water-guided laser jetting device with a hydraulic pressure change monitoring function further comprises a nozzle locking member, wherein the nozzle locking member is used to fix the nozzle on the lower end cover, and the nozzle locking member is provided with a through hole coaxial with the nozzle.

[0014] Preferably, a laser through hole for laser passage is provided in the axial direction of the cover plate fixing piece, a second accommodating cavity which is recessed upward is formed on the lower surface of the cover plate fixing piece, an inner convex ring is formed on the top wall of the second accommodating cavity, the diameter of the inner convex ring is smaller than the diameter of the transparent cover plate, a top groove is formed between the inner convex ring and the side wall of the second accommodating cavity, an elastic member is provided in the top groove, and the elastic member provides a first downward force on the transparent cover plate.

[0015] Preferably, the detection unit includes a capacitive sensor and a conductive coating, the capacitive sensor is arranged on the lower surface of the inner convex ring, and the conductive coating is arranged on the upper surface of the transparent cover plate for mutual induction with the capacitive sensor.

[0016] Preferably, a first sealing ring is further provided in the second accommodating cavity, and the first sealing ring is provided between the transparent cover plate and the side wall of the second accommodating cavity.

[0017] Preferably, the lower end of the lower end cover is formed with a lower outward-folding edge, and the lower outward-folding edge is used to fix the lower end cover to the upper end cover;

[0018] The diameter of the middle and upper part of the lower end cover is the same as the diameter of the first accommodating chamber. An upper annular groove and a lower annular groove located below the upper annular groove are provided on the side surface of the lower end cover. The upper annular groove and the lower annular groove are spaced apart in the axial direction of the lower end cover. The upper annular groove is connected to the pressure stabilizing chamber.

[0019] The liquid inlet channel is communicated with the upper annular groove.

[0020] Preferably, a second sealing ring is provided in the lower ring groove.

[0021] Preferably, the upper surface of the lower end cover is provided with several concentric guide convex rings, and guide channels are formed between adjacent guide convex rings. The guide convex rings close to the center of the lower end cover surround a central area, and each guide convex ring is provided with several guide channels arranged radially along the guide convex ring. The guide channels are used to guide the liquid to flow from the outer guide channels to the central area.

[0022] Preferably, the straight lines on which the guide channels on any adjacent guide convex rings are located are not collinear.

[0023] Preferably, the first through hole is a stepped through hole, the diameter of the lower end of the first through hole is smaller than the diameter of the upper end, the top end of the cover plate fixing piece is bent outward to form an upper outward folding edge, the diameter of the upper outward folding edge is equal to the diameter of the upper end of the first through hole, and the lower end of the cover plate fixing frame is equal to the diameter of the lower end of the first through hole.

[0024] The above solution of the present invention has the following beneficial effects:

[0025] In the present application, the characteristic that the transparent cover moves due to the first and second forces is utilized, and the position of the transparent cover is used to feedback the change in liquid pressure in the injection device to convert the distance signal into a pressure signal output. This structure is not affected by water mist, and compared with traditional monitoring methods, the accuracy and reliability are greatly improved.

[0026] Other features and advantages of the present invention will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is a cross-sectional view of the present invention;

[0028] Figure 2 is a cross-sectional view of the upper end cover;

[0029] Figure 3 is a cross-sectional view of the lower end cover;

[0030] Figure 4 It is a three-dimensional view of the lower end cover;

[0031] Figure 5 is a cross-sectional view of the cover plate fixing member;

[0032] Figure 6 It is a cross-sectional view of the nozzle being fixed;

[0033] Figure 7 yes Figure 1 Enlarged view of part A

[0034] Figure 8 It is a flow rate diagram of the pressure stabilizing chamber.

[0035] [Description of Reference Numerals]

[0036] 100-upper end cover, 110-first accommodating cavity, 120-first through hole, 121-second primary through hole, 122-second secondary through hole, 130-liquid inlet channel

[0037] 200-cover fixing member, 210-detection unit, 211-capacitive sensor, 212-conductive coating, 220-laser through hole, 230-second accommodating cavity, 240-inner convex ring, 250-top groove, 260-elastic member, 270-first sealing ring, 280-upper outward folding edge,

[0038] 300-transparent cover,

[0039] 400-lower end cover, 410-pressure stabilizing chamber, 420-lower outward folding edge, 430-upper ring groove, 440-lower ring groove, 441-second sealing ring, 450-flow guide convex ring, 451-first flow guide convex ring, 452-second flow guide convex ring, 460-flow guide channel, 480-flow guide channel, 490-second through hole, 491-first level through hole, 492-first level through hole, 493-third level through hole, 494-fourth level through hole, 495-third sealing ring,

[0040] 500-nozzle,

[0041] 600-Nozzle locking piece, 610 through hole. DETAILED DESCRIPTION

[0042] In order to make the technical problems, technical solutions and advantages to be solved by the present invention clearer, a detailed description will be given below with reference to the accompanying drawings and specific embodiments.

[0043] like Figure 1-8 As shown, an embodiment of the present invention provides a water-guided laser jetting device with a hydraulic pressure change monitoring function, comprising an upper end cover 100, a cover plate fixing member 200, a lower end cover 400, and a nozzle 500. A first accommodating cavity 110 is provided on the lower surface of the upper end cover 100. The first accommodating cavity 110 is formed by an upward depression of the lower surface of the upper end cover 100. A first through hole 120 is provided on the upper surface of the upper end cover 100. The first through hole 120 is formed along the axial direction of the upper end cover 100, i.e., the rotation center of the first through hole 120 coincides with the rotation center of the upper end cover 100. The lower end of the first through hole 120 is connected to the first accommodating cavity 110.

[0044] Combine Figure 5 、 7The cover plate fixing member 200 is used to fix the transparent cover plate 300, so that the laser passes through the cover plate fixing member 200 and acts on the transparent cover plate 300. Specifically, the cover plate fixing member 200 is disposed within the first through hole 120, and the transparent cover plate 300 is disposed below the cover plate fixing member 200. A first force is generated between the transparent cover plate 300 and the cover plate fixing member 200, and this first force pushes the transparent cover plate 300 downward. A detection unit 210 is also disposed between the cover plate fixing member 200 and the transparent cover plate 300. The detection unit 210 is used to detect the distance between the cover plate fixing member 200 and the transparent cover plate 300.

[0045] like Figure 1 、 6 The lower end cap 400 is disposed within the first accommodating chamber 110, with its upper surface positioned below the transparent cover plate 300. A pressure-stabilizing chamber 410 is provided on the upper surface of the lower end cap 400. The pressure-stabilizing chamber 410 is configured to allow fluid to flow from the edge of the lower end cap 400 toward the center, and to exert a second upward force on the transparent cover plate 300 at the center of the upper surface of the lower end cap 400. The aforementioned nozzle 500 is disposed at the center of the upper surface of the lower end cap 400 to spray the liquid at the center of the lower end cap 400. Preferably, a sapphire with a hole is embedded at the inlet of the nozzle 500.

[0046] A liquid inlet channel 130 is further provided on the side of the upper end cover 100 , and the liquid inlet channel 130 is communicated with the pressure stabilizing chamber 410 .

[0047] In the present application, the change in the distance between the transparent cover 300 and the cover fixing member 200 is used to represent the change in the liquid pressure at the inlet of the nozzle 500, making it easier for operators to grasp the water jet information and obtain hydraulic pressure fluctuations without being affected by water mist. Specifically, when liquid flows from the liquid inlet channel 130 into the pressure stabilizing chamber 410 to achieve the effect of stabilizing the liquid pressure, part of the liquid is ejected through the nozzle 500 below the transparent cover 300, and part of the liquid generates an upward second force at the center of the upper surface of the lower end cover 400. The second force pushes the transparent cover 300 upward. When the resultant force of the first and second forces is zero, the distance between the transparent cover 300 and the lower surface of the cover fixing member 200 remains constant. At this time, the signal detected by the detection unit 210 is in a stable state, indicating that the pressure at the inlet of the nozzle 500 remains constant. By analyzing the signal, the hydraulic pressure corresponding to the current distance can be known. When the pressure at the nozzle 500 inlet changes, for example, if the pressure increases, the second force increases, pushing the transparent cover 300 upward, causing the distance between the transparent cover 300 and the lower surface of the cover fixing member 200 to decrease. At this time, the signal output by the detection unit 210 changes, and the operator can understand the pressure change by analyzing the signal. The signal analysis here can be done using existing technology, which will not be described in detail here.

[0048] In the present application, the detection unit 210 detects the position of the transparent cover 300 under different liquid pressures to determine the current liquid pressure. At the same time, the second force that pushes the transparent cover 300 to move is generated by the liquid. Therefore, the position change of the transparent cover 300 can indirectly represent the pressure of the liquid, that is, the pressure of the liquid at the point where it enters the nozzle 500.

[0049] Combine Figure 6 The water-guided laser jetting device with hydraulic pressure change monitoring also includes a nozzle locking member 600, which is used to secure the nozzle 500 to the lower end cover 400. The nozzle locking member 600 is provided with a through hole 610 coaxial with the nozzle 500. The high-speed jet ejected from the nozzle 500 passes through the through hole 610 to perform cutting. Preferably, the rotation center of the through hole 610 is coaxial with the rotation center of the nozzle orifice in the nozzle 500.

[0050] Combine Figure 5 A laser through-hole 220 is provided in the axial direction of the cover plate fixing member 200. The laser through-hole 220 is coaxially arranged with the transparent cover plate 300 to prevent the laser from being blocked by the cover plate fixing member 200 when irradiating the transparent cover plate 300. Preferably, a second accommodating cavity 230 is formed on the lower surface of the cover plate fixing member 200. The second accommodating cavity 230 is formed by an upward depression of the lower surface. An inner convex ring 240 is further formed on the top wall of the second accommodating cavity 230. The inner convex ring 240 convexes downward. The transparent cover plate 300 is disposed in the second accommodating cavity 230 and is located below the inner convex ring 240. The diameter of the inner convex ring 240 is smaller than the diameter of the transparent cover plate 300. The inner convex ring 240 is coaxial with the rotation center of the laser through-hole 220. A top groove 250 is formed between the inner convex ring 240 and the side wall of the second accommodating cavity 230 . An elastic member 260 is disposed in the top groove 250 . The elastic member 260 generates a first force acting on the transparent cover 300 .

[0051] Preferably, the elastic member 260 is a rubber sealing ring. The rubber sealing ring is fitted over the outer wall of the inner convex ring 240. The diameter of the rubber sealing ring is greater than the downward projection of the inner convex ring 240. This space allows the transparent cover 300 to be spaced from the lower surface of the inner convex ring 240, leaving space for the transparent cover 300 to move up and down. The rubber sealing ring also provides a sealing effect.

[0052] In this embodiment, the detection unit 210 includes a capacitive sensor 211 and a conductive coating 212. The capacitive sensor 211 is arranged on the lower surface of the inner convex ring 240, and the conductive coating 212 is arranged on the upper surface of the transparent cover 300. The capacitive sensor 211 detects the distance between itself and the conductive coating 212, and then obtains the distance between the lower surface of the inner convex ring 240 and the transparent cover 300.

[0053] Preferably, a first sealing ring 270 is further provided in the second accommodating cavity 230 . The first sealing ring 270 is provided between the transparent cover plate 300 and the side wall of the second accommodating cavity 230 to prevent leakage between the transparent cover plate 300 and the side wall of the second accommodating cavity 230 .

[0054] For further reference, Figure 3 、 4 The lower end of the lower end cover 400 is formed with an outwardly folded lower outward folding edge 420. The lower outward folding edge 420 is fixed to the bottom surface of the upper end cover 100 with bolts to prevent the upper end cover 100 and the lower end cover 400 from loosening and causing leakage. The upper middle portion of the lower end cover 400 is located in the first accommodating chamber 110, and the diameter of the upper middle portion of the lower end cover 400 is the same as the diameter of the first accommodating chamber 110. An upper annular groove 430 and a lower annular groove 440 are also provided in the upper middle portion of the lower end cover 400. The upper annular groove 430 and the lower annular groove 440 are arranged along the axial direction of the lower end cover 400, and the upper annular groove 430 is located above the lower annular groove 440. The sidewalls and bottom wall of the upper annular groove 430 and the sidewalls and top wall of the first accommodating chamber 110 form a chamber, which is connected to the pressure stabilizing chamber 410 and is also connected to the liquid inlet channel 130. The liquid enters the chamber through the liquid inlet channel 130 , and the liquid level gradually rises. When the liquid level is equal to the upper surface of the lower end cover 400 , the liquid flows into the pressure stabilizing chamber 410 and flows toward the center of the upper surface of the lower end cover 400 .

[0055] Preferably, a second sealing ring 441 is provided in the lower ring groove 440 .

[0056] Furthermore, a second through hole 490 is provided on the lower surface of the lower end cover 400. The second through hole 490 is a four-level stepped through hole, which is respectively a first-level through hole 491, a first-level through hole 492, a third-level through hole 493 and a fourth-level through hole 494 from top to bottom. Figure 3 、 6 The nozzle 500 is positioned within the first primary through-hole 491. The nozzle locking member 600 presses the flange of the nozzle 500 against the first shoulder formed by the first secondary through-hole 492 and the tertiary through-hole 493. A third sealing ring 495 is positioned over the nozzle 500 to seal the nozzle 500 against the second through-hole. The nozzle locking member 600 is bolted to the second shoulder formed by the tertiary through-hole 493 and the quaternary through-hole 494.

[0057] Referring to 1 and 2, the aforementioned first through hole 120 is a two-stage stepped through hole, which, from top to bottom, is respectively the second-level through hole 121 and the second-level through hole 122. The diameter of the second-level through hole 121 is larger than the diameter of the second-level through hole 122, and the second-level through hole 121 and the second-level through hole 122 form a third shoulder at their connection. The top end of the cover plate fixing member 200 is folded outward to form an upper outward folding edge 280. The diameter of the upper outward folding edge 280 is the same as the diameter of the second-level through hole 121. The upper outward folding edge 280 is fixed to the third shoulder by bolts. The lower end of the cover plate fixing member 200 has the same diameter as the second-level through hole 122. A fourth sealing ring is provided between the lower end of the cover plate fixing member 200 and the second-level through hole 122.

[0058] In this application, the aforementioned pressure stabilization chamber 410 is formed by the following method:

[0059] Reference Figure 4 A plurality of concentric guide rings 450 are provided on the upper surface of the lower end cover 400. The guide rings 450 include a first guide ring 451 and a second guide ring 452. The first guide ring 451 is provided outside the second guide ring 452. A plurality of second guide rings 452 are provided. The distance between the first guide ring 451 and the second guide ring 452 and the distance between the second guide rings 452 are equal. A guide channel 460 is formed between the first guide ring 451 and the second guide ring 452 and between the second guide rings 452 for liquid flow. The first guide ring 451 surrounds the upper surface of the lower end cover 400 to form a central area. A guide channel 480 is provided on each guide ring 450. The guide channel 480 is provided in the radial direction of each guide ring 450. The guide channel 480 is used to connect adjacent guide channels 460, or to connect the guide channels 460 with the central area. When the liquid enters the outermost circle of the guide channel 460, part of the liquid flows along the circumferential direction of the guide channel, and the other part of the liquid enters the inner circle of the guide channel 460 through the guide channel 480, realizing liquid grading and diversion, reducing liquid pressure fluctuations, and the liquid after the pressure stabilizes finally flows into the central area. The central area is located below the transparent cover 300. Part of the liquid is sprayed out through the nozzle 500 in the first-level through hole 491, and the other part of the liquid is used to generate the second force.

[0060] By providing the pressure stabilizing chamber 410 , the liquid pressure can be effectively stabilized, thereby avoiding frequent movement of the transparent cover 300 caused by the constant pressure pump being unable to provide liquid that meets the pressure fluctuation requirements.

[0061] In this embodiment, the diversion channel 460 and the diversion channel 480 are formed by the diversion protrusion 450, the transparent cover 300, the cover fixing member 200, and the top wall of the first chamber 110 to form a cavity, which facilitates the processing of the upper surface of the lower end cover 400. It is understood that the pressure stabilizing chamber 410 can also form the diversion channel 460 and the diversion channel 480 by drilling.

[0062] Preferably, the straight lines on which the guide channels 480 on any adjacent guide protrusion rings 450 are located are not collinear, thereby improving the pressure stabilizing effect of the pressure stabilizing cavity 410 .

[0063] In this embodiment, three flow guide channels 460 are formed, and each flow guide protrusion ring 450 is provided with twelve flow guide channels 480. Figure 8 In the process of the liquid flowing from the outer circle to the inner circle of the pressure-stabilizing chamber 410 at a pressure of 10 MPa, the flow rate and flow of the liquid are uniformed, and the overall flow rate of the pressure-stabilizing chamber 410 is uniform, proving that the hydraulic pressure of the liquid is stable.

[0064] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A water-guided laser jetting device with a hydraulic pressure change monitoring function, characterized in that: include: An upper end cover (100) is provided with a first accommodating cavity (110) that is recessed upward on its lower surface, and a first through hole (120) formed in the axial direction on its upper surface; A cover plate fixing member (200) is arranged in the first through hole (120); a transparent cover plate (300) is arranged below the cover plate fixing member (200); a first acting force is exerted between the cover plate fixing member (200) and the transparent cover plate (300); the first acting force pushes the transparent cover plate (300) to move downward; a detection unit (210) is further arranged between the cover plate fixing member (200) and the transparent cover plate (300); the detection unit (210) detects the distance between the cover plate fixing member (200) and the transparent cover plate (300); A lower end cover (400) is disposed in the first accommodating cavity (110), and the upper surface of the lower end cover (400) is located below the transparent cover plate (300). The upper surface of the lower end cover (400) is provided with a pressure stabilizing cavity (410) for liquid to flow from the edge of the lower end cover (400) to the center of the lower end cover (400). After the liquid flows through the pressure stabilizing cavity (410), the liquid exerts a second upward force on the transparent cover plate (300) at the center of the lower end cover (400); A nozzle (500) is provided at the center of the lower end cover (400), and the nozzle (500) is used to spray the liquid at the center of the lower end cover (400); The liquid inlet channel (130) is opened on the side of the upper end cover (100) and communicates with the pressure stabilizing chamber (410).

2. The water-guided laser jetting device with a hydraulic pressure change monitoring function according to claim 1, characterized in that: The water-guided laser jetting device with a hydraulic pressure change monitoring function further comprises a nozzle locking member (600), wherein the nozzle locking member (600) is used to fix the nozzle (500) on the lower end cover (400), and a through hole (610) coaxial with the nozzle (500) is provided on the nozzle locking member (600).

3. The water-guided laser jetting device with a hydraulic pressure change monitoring function according to claim 1, characterized in that: A laser through hole (220) for laser passage is provided in the axial direction of the cover plate fixing member (200), a second accommodating cavity (230) that is recessed upward is formed on the lower surface of the cover plate fixing member (200), an inner convex ring (240) is formed on the top wall of the second accommodating cavity (230), the diameter of the inner convex ring (240) is smaller than the diameter of the transparent cover plate (300), a top groove (250) is formed between the inner convex ring (240) and the side wall of the second accommodating cavity (230), an elastic member (260) is provided in the top groove (250), and the elastic member (260) provides a first downward force on the transparent cover plate (300).

4. The water-guided laser jetting device with a hydraulic pressure change monitoring function according to claim 3, characterized in that: The detection unit (210) comprises a capacitive sensor (211) and a conductive coating (212), wherein the capacitive sensor (211) is arranged on the lower surface of the inner convex ring (240), and the conductive coating (212) is arranged on the upper surface of the transparent cover plate (300) for mutual induction with the capacitive sensor (211).

5. The water-guided laser jetting device with a hydraulic pressure change monitoring function according to claim 3, characterized in that: A first sealing ring (270) is also provided in the second accommodating cavity (230), and the first sealing ring (270) is provided between the transparent cover plate (300) and the side wall of the second accommodating cavity (230).

6. The water-guided laser jetting device with a hydraulic pressure change monitoring function according to claim 1, characterized in that: A lower outward-folding edge (420) is formed at the lower end of the lower end cover (400), and the lower outward-folding edge (420) is used to fix the lower end cover (400) to the upper end cover (100); The diameter of the middle and upper portion of the lower end cover (400) is the same as the diameter of the first accommodating chamber (110); an upper annular groove (430) and a lower annular groove (440) located below the upper annular groove (430) are provided on the side surface of the lower end cover (400); the upper annular groove (430) and the lower annular groove (440) are spaced apart in the axial direction of the lower end cover (400); and the upper annular groove (430) is communicated with the pressure stabilizing chamber (410); The liquid inlet channel (130) is in communication with the upper annular groove (430).

7. The water-guided laser jetting device with a hydraulic pressure change monitoring function according to claim 6, characterized in that: A second sealing ring (441) is provided in the lower ring groove (440).

8. The water-guided laser jetting device with a hydraulic pressure change monitoring function according to claim 1, characterized in that: The upper surface of the lower end cover (400) is provided with a plurality of concentric guide convex rings (450), and guide flow channels (460) are formed between adjacent guide convex rings (450). The guide convex rings (450) close to the center of the lower end cover (400) surround and form a central area. Each guide convex ring (450) is provided with a plurality of guide channels (480) arranged radially along the guide convex ring (450), and the guide channels (480) are used to guide liquid to flow from the outer guide flow channels (460) to the central area.

9. The water-guided laser jetting device with a hydraulic pressure change monitoring function according to claim 7, characterized in that: The straight lines on which the guide channels (480) on any adjacent guide convex rings (450) are located are not collinear.

10. The water-guided laser jetting device with a hydraulic pressure change monitoring function according to claim 1, characterized in that: The first through hole (120) is a stepped through hole, the diameter of the lower end of the first through hole (120) is smaller than the diameter of the upper end, the top end of the cover plate fixing member (200) is bent outward to form an upper outward folding edge (280), the diameter of the upper outward folding edge (280) is equal to the diameter of the upper end of the first through hole (120), and the lower end of the cover plate fixing member (200) is equal to the diameter of the lower end of the first through hole (120).

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