A floating marking needle assembly

Abstract

The application discloses a floating type marking needle assembly, which comprises a floating needle head base, an electromagnetic valve, a needle cavity core, a printing needle, a needle outlet air inlet connector, a needle cavity sleeve and a needle return air inlet connector. The electromagnetic valve is fixed on the floating needle head base. The needle cavity core is vertically inserted into a vertical inner cavity on the bottom surface of the floating needle head base, and the printing needle is vertically inserted into the inner cavity of the needle cavity core. The upper part of the printing needle separates the inner cavity of the needle cavity core into an upper air cavity and a lower air cavity which are isolated from each other. The needle cavity sleeve is sleeved outside the needle cavity core, and the needle cavity sleeve is connected with the floating needle head base and makes the upper end of the needle cavity core tightly abut on the top surface of the vertical inner cavity. The space between the needle cavity sleeve and the needle cavity core forms a gas storage cavity, the lower air cavity is communicated with the gas storage cavity, and the needle return air inlet connector is communicated with the gas storage cavity. The floating type marking needle assembly has the technical advantages of good flexibility, more accurate control for each needle, high efficiency, energy saving, small gas consumption and small noise.

Description

Technical Field

[0001] This invention relates to the field of marking machine technology for parts, and in particular to a floating marking needle assembly. Background Technology

[0002] The information disclosed in the background section of this invention is intended only to enhance the understanding of the overall background of the invention and is not necessarily to be construed as an admission or in any way implying that such information constitutes prior art known to those skilled in the art.

[0003] Traditional pneumatic marking needle assemblies have strict tolerance limits on the marking distance from the needle tip to the workpiece surface and require a high degree of flatness of the marked surface. However, as a component marking equipment, multi-variety mixed-production lines produce components of varying heights, and the tolerances of cast parts are even more difficult to guarantee, resulting in significant height differences. This frequently leads to poor marking effects or incompatibility between parts, necessitating the addition of multiple machines or three-axis mechanisms, increasing production costs. Component manufacturers, positioned in the mid-to-lower end of the industry with limited profit margins, place particular emphasis on equipment flexibility. Therefore, marking needles capable of adapting to large height differences are needed to improve production stability, accommodate parts of various heights, and reduce production costs.

[0004] As the public places greater emphasis on quality, higher demands are being placed on marking effects and stability. Traditional marking needle assemblies, limited by their structure, have uncontrollable needle frequency, inevitably resulting in multiple markings at the same position, such as at the beginning or end of a stroke, leading to uneven dots and affecting the aesthetics of the characters. Furthermore, the high-frequency vibration of the springs is prone to fatigue fracture, also affecting the stability of the marking effect. In addition, traditional marking needle assemblies generate significant marking noise and consume a large amount of air, making it increasingly difficult to meet the stringent requirements for noise and energy consumption control in industrial settings. Summary of the Invention

[0005] This invention proposes a floating marking needle assembly, which features high flexibility, better adaptability to marking large height differences, more precise control over each needle ejection, high efficiency and energy saving, low air consumption, and low noise. To achieve the above objectives, the technical solution of this invention is as follows.

[0006] A floating marking needle assembly includes: a float needle head seat, a solenoid valve, a needle cavity core, a printing needle, a needle outlet air inlet connector, a needle cavity sleeve, and a needle return air inlet connector. The solenoid valve is fixed to the float needle head seat. The needle cavity core is vertically inserted into a vertical inner cavity on the bottom surface of the float needle head seat. The printing needle is vertically inserted into the inner cavity of the needle cavity core, with its lower end located outside the needle cavity core. The upper portion of the printing needle divides the inner cavity of the needle cavity core into an isolated upper air cavity and a lower air cavity. The air outlet of the solenoid valve is connected to the upper air cavity, the needle outlet air inlet connector is connected to the air inlet of the solenoid valve, the air inlet is connected to the air outlet, and the solenoid valve also has an exhaust port connected to the air outlet. The needle cavity sleeve is fitted over the needle cavity core and is connected to the float needle head seat, causing the upper end of the needle cavity core to abut tightly against the top surface of the vertical inner cavity. The space between the needle cavity sleeve and the needle cavity core forms an air storage chamber, and the side wall of the needle cavity core has a vent hole connecting the lower air chamber and the air storage chamber. The inner end of the return needle air inlet connector is connected to the air storage chamber.

[0007] Furthermore, a needle seat is fixed on the upper outer wall of the printing needle, and the needle seat is sealed to the inner cavity of the needle core, thereby dividing the inner cavity of the needle core into an upper air chamber and a lower air chamber that are isolated from each other, and allowing the printing needle to slide up and down along the inner cavity of the needle core.

[0008] Furthermore, a first sealing ring is provided between the upper end of the needle cavity core and the top surface of the vertical inner cavity, and the first sealing ring is fixed on the inner wall of the top surface of the vertical inner cavity to better prevent air leakage between the upper end of the needle cavity core and the top surface of the vertical inner cavity.

[0009] Furthermore, the lower side wall of the inner cavity of the needle core has a protruding receiving platform, on which a buffer washer is fixed, and the upper and lower spaces of the buffer washer are connected, and the vent hole is opened on the side wall of the air storage cavity below the buffer washer.

[0010] Furthermore, the outer diameter of the lower sidewall of the needle cavity core is smaller than the outer diameter of the upper sidewall, thereby forming a concave platform between the lower and upper sidewalls. The lower port of the needle cavity sleeve is a necked opening, and the inner wall of the necked opening tightly abuts against the lower surface of the concave platform. The outer wall of the needle cavity sleeve is threadedly connected to the inner wall of the vertical inner cavity, and the upper end of the needle cavity core tightly abuts against the top surface of the vertical inner cavity, thereby securing the needle cavity core within the vertical inner cavity.

[0011] Furthermore, a second sealing ring is provided between the inner wall of the constricted opening and the lower surface of the concave platform to prevent air leakage from the air storage cavity.

[0012] Furthermore, it also includes a solenoid valve pad that surrounds the solenoid valve therein, and the height of the solenoid valve pad is not less than the height of the solenoid valve. The top surface of the solenoid valve pad has a mounting hole. Optionally, the solenoid valve pad is fixed to the top surface of the float head seat by fasteners.

[0013] Furthermore, it also includes a muffler, which is connected to both the air inlet and exhaust outlet of the solenoid valve to reduce the noise generated during air intake and exhaust.

[0014] Furthermore, a guide bearing is provided between the lower end of the needle cavity core and the printing needle, which mainly serves to guide and support the needle.

[0015] Furthermore, the outer end of the return needle air inlet connector is connected to a compressed air source to provide compressed gas to the air storage chamber and the lower air chamber. The outer end of the outlet needle air inlet connector is connected to a compressed air source to provide compressed gas to the upper air chamber.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] (1) The floating marking needle assembly of the present invention is achieved by controlling the opening and closing of the solenoid valve each time the needle is ejected. Each strike is controllable and the performance is stable, which also avoids the problem of spring fatigue and breakage and improves the overall stability of the equipment.

[0018] (2) The floating marking needle assembly of the present invention does not have a spring. Instead, it uses a specially designed air passage to suspend the marking needle using air pressure. This buoyancy can be kept basically constant by easily controlling the air pressure supply, maintaining continuous stability and not being affected by changes in the position of the marking needle. In this way, the floating needle assembly can achieve a long needle extension distance and a large height difference adaptability without affecting the force or frequency. In addition, since the needle extension and retraction of the floating marking needle assembly of the present invention are achieved by switching the ebb and flow of air pressure, it is freed from the constraints of a spring, thus being able to adapt well to marking work where there are large height differences on the surface of the parts.

[0019] (3) In the floating marking needle assembly of the present invention, there is no direct communication between the internal compressed gas and the atmosphere during the continuous printing process of the printing needle. This allows the input compressed gas to be converted into the thrust of the printing needle to the maximum extent, making fuller use of the energy of the compressed gas, improving the marking force, increasing the energy utilization rate, and significantly reducing the gas consumption. In addition, because the solenoid valve of the floating marking needle assembly of the present invention reverses when the needle returns to exhaust air, it closes the input of compressed gas and then discharges the compressed gas in the upper air chamber to the atmosphere through the exhaust port of the solenoid valve. Furthermore, because a silencer is installed at the exhaust port, the noise generated during the printing process can be significantly reduced.

[0020] (4) The floating marking needle assembly of the present invention controls the air supply through a solenoid valve, is not limited by heat generation, and has the ability to work stably for a long time with high intensity, which overcomes the shortcomings of traditional electric needle assemblies that cannot work at high intensity for a long time. Attached Figure Description

[0021] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0022] Figure 1 The following is a schematic diagram of the floating marking needle assembly in the embodiments.

[0023] Figure 2 This is a partial cross-sectional view of the floating marking needle assembly in the following embodiments.

[0024] Figure 3 for Figure 2 The image shows a cross-sectional view (AA) of the floating marking needle assembly.

[0025] The markings in the above diagram represent: 1-Floating needle head seat, 2-Solenoid valve, 3-Needle cavity core, 4-Printing needle, 5-Needle outlet air inlet connector, 6-Needle cavity sleeve, 7-Needle return air inlet connector, 8-Buffer washer, 9-Second sealing ring, 10-Solenoid valve pad, 11-Fastener, 12-Silencer, 13-Guide bearing, 101-Vertical inner cavity, 102-First sealing ring, 301-Upper air cavity, 302-Lower air cavity, 303-Air storage cavity, 304-Ventilation hole, 305-Concave platform, 401-Needle seat. Detailed Implementation

[0026] It should be noted that the following detailed description is illustrative and intended to provide further explanation of the invention. Unless otherwise specified, all technical and scientific terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0027] It should be noted that the terminology used herein is for the purpose of describing specific embodiments only and is not intended to limit the exemplary embodiments of the present invention. The terms "upper," "lower," "left," and "right" appearing in this invention only indicate that they correspond to the upper, lower, left, and right directions of the drawings themselves, and do not limit the structure. They are merely for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to needs to have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the present invention.

[0028] Terminology Explanation: The terms "installation," "connection," "linking," and "fixing" in this invention should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, a direct connection, or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of these terms in this invention based on the specific circumstances. The floating marking needle assembly of this invention will now be further described in conjunction with the accompanying drawings and specific embodiments.

[0029] refer to Figure 1 , Figure 2 and Figure 3 Example of a floating marking needle assembly, which mainly includes: a floating needle head seat 1, a solenoid valve 2, a needle cavity core 3, a printing needle 4, a needle outlet air inlet connector 5, a needle cavity sleeve 6, and a needle return air inlet connector 7. Wherein:

[0030] The solenoid valve 2 is fixed to the upper surface of the float needle head seat 1. The bottom surface of the float needle head seat 1 has an upwardly extending cylindrical vertical inner cavity 101, and the inner surface of its lower port has threads. The needle core 3 is a cylindrical body with an inner cavity, which is vertically inserted into the vertical inner cavity 101, and the upper end of the needle core 3 tightly abuts against the inner wall of the top surface of the vertical inner cavity 101.

[0031] The printing needle 4 is vertically inserted into the inner cavity of the needle core 3, with its lower end located outside the needle core 3. It should be understood that the lower end of the printing needle 4 has a tip for striking a mark on the workpiece surface. A needle seat 401 is fixed to the upper outer wall of the printing needle 4, and the two are connected by an interference fit. The cross-sectional shape of the needle seat 401 matches the inner cavity of the needle core 3, thereby sealing the sidewall of the needle seat 401 with the sidewall of the inner cavity of the needle core 3. This divides the inner cavity of the needle core 3 into an isolated upper air chamber 301 and a lower air chamber 302, allowing the printing needle 4 to slide up and down along the inner cavity of the needle core 3. For example, the inner cavity of the needle core 3 is cylindrical, and the needle seat 401 is a cylindrical structure of corresponding dimensions.

[0032] The outlet of the solenoid valve 2 is connected to the upper air chamber 301, and the needle inlet connector 5 is connected to the inlet of the solenoid valve 2. The inlet is connected to the outlet, and the solenoid valve 2 also has an exhaust port connected to the outlet. The outer diameter of the lower side wall of the needle core 3 is smaller than the outer diameter of the upper side wall, thereby forming an inner recess 305 between the lower and upper side walls. The needle sleeve 6 has a cylindrical structure with a necked-off end, and the inner wall of the necked-off end is tightly abutted against the lower surface of the inner recess 305. The outer wall of the needle cavity sleeve 6 is threadedly connected to the inner wall of the vertical inner cavity 101, and the upper end of the needle cavity core 3 is tightly abutted against the inner wall of the top surface of the vertical inner cavity 101, thereby fastening the needle cavity core 3 in the vertical inner cavity 101. At the same time, the space between the inner wall of the needle cavity sleeve 6 and the outer wall of the needle cavity core 3 forms an air storage cavity 303, and the side wall of the needle cavity core 3 has a vent hole 304 that connects the lower air cavity 302 and the air storage cavity 303.

[0033] The inner end of the return needle air inlet connector 7 is connected to the air storage chamber 303. In use, the outer end of the return needle air inlet connector 7 is connected to a compressed air source to provide compressed gas to the air storage chamber 303 and the lower air chamber 302. The outer end of the exit needle air inlet connector 5 is connected to a compressed air source to provide compressed gas to the upper air chamber 301. Under the action of the compressed gas in the upper air chamber 301 and the lower air chamber 302, the printing needle 4 can be suspended in the inner cavity of the needle core 3. By adjusting the air pressure of the compressed gas in the upper air chamber 301 and the lower air chamber 302, the printing needle 4 can be continuously exited and retracted for marking.

[0034] refer to Figure 3 In another embodiment, in the floating marking needle assembly described in the above embodiment, a first sealing ring 102 is provided between the upper end of the needle core 3 and the top surface of the vertical inner cavity 101, and the first sealing ring 102 is fixed on the inner wall of the top surface of the vertical inner cavity 101 to better prevent air leakage between the upper end of the needle core 3 and the top surface of the vertical inner cavity 101, which would cause air pressure loss in the upper air chamber 301 and affect the marking effect.

[0035] refer to Figure 3 In another embodiment, in the floating marking needle assembly described in the above embodiment, the lower side wall of the inner cavity of the needle core 3 has a protruding receiving platform, on which a buffer washer 8 is fixed, and the upper and lower spaces of the buffer washer 8 are connected. The vent 304 is opened on the side wall of the air storage cavity 303 below the buffer washer 8, thereby buffering the printing needle 4 and preventing the needle seat 401 at the upper end of the printing needle 4 from directly hitting the bottom of the needle core 3.

[0036] refer to Figure 3In another embodiment, in the floating marking needle assembly described in the above embodiment, a first sealing ring 102 is provided between the inner wall of the necked opening and the lower surface of the recessed platform 305 to prevent air leakage from the air storage chamber 303, which would cause air pressure loss in the air storage chamber 303 and the lower air chamber 302, affecting the marking effect. Simultaneously, the first sealing ring 102 also acts as a buffer, preventing the needle seat 401 at the upper end of the printing needle 4 from directly impacting the top wall of the inner cavity of the needle core 3. Furthermore, a guide bearing 13 is provided between the lower port of the needle core 3 and the printing needle 4 to better prevent air leakage from the lower air chamber 302 between the lower port of the needle core 3 and the side wall of the printing needle 4, which would cause air pressure loss in the air storage chamber 303 and the lower air chamber 302, affecting the marking effect.

[0037] refer to Figures 1 to 3 In another embodiment, the floating marking needle assembly described in the above embodiment further includes a solenoid valve pad 10, which surrounds the solenoid valve 2 therein, and the height of the solenoid valve pad 10 is not less than the height of the solenoid valve 2. The top surface of the solenoid valve pad 10 has mounting holes to secure the floating marking needle assembly to the marking machine. Optionally, the solenoid valve pad 10 is fixed to the top surface of the floating needle head seat 1 by fasteners 11.

[0038] refer to Figure 2 In another embodiment, the floating marking needle assembly described in the above embodiment example also includes a muffler 12, and two mufflers 12 are provided on the exhaust passage of the solenoid valve 2 to reduce the noise generated during exhaust.

[0039] In use, when the solenoid valve 2 (such as a high-frequency solenoid valve) receives an opening signal, the air inlet and outlet of the solenoid valve 2 are connected. The outer end of the needle outlet air inlet connector 5 is connected to a compressed air source, providing compressed gas to the upper air chamber 301. The compressed gas enters the upper air chamber 301 above the printing needle 4 through the air outlet of the solenoid valve 2. At the same time, the outer end of the needle return air inlet connector 7 is connected to a compressed air source, providing compressed gas to the air storage chamber 303 and the lower air chamber 302. To ensure the smooth exit of the marking needle 4, the air pressure in the upper air chamber 301 needs to be greater than that in the lower air chamber 302. Because the exit air pressure is higher than the return air pressure, the printing needle 4 is pushed downwards by the exit air pressure. The gas in the lower air chamber 302 is discharged into the air storage chamber 303 through the vent 304. Since the air storage chamber 303 has a larger space and is connected to external air supply pipes, the expulsion of gas from the lower air chamber 302 during the downward movement of the printing needle 4 does not cause a significant increase in the air pressure in the upper air chamber 301, thus ensuring a stable return force. As the printing needle 4 advances, it will eventually strike the workpiece to achieve one marking. During the impact, the solenoid valve 2 receives a closing signal, closing the air inlet and opening the air outlet and exhaust outlet. At this time, the compressed gas in the upper air chamber 301 returns to the solenoid valve 2 through its air inlet and is discharged to the outside through its exhaust outlet. The exhaust noise is then reduced by the silencer 12. As exhaust continues, the air pressure in the upper air chamber 301 gradually decreases below that in the lower air chamber 302. Eventually, the printing needle 4 returns to its initial position under the influence of the air pressure in the lower air chamber 302, stopping upon contact with the first sealing ring 102. This completes one cycle. By adjusting the opening and closing time and frequency signal of the solenoid valve 2 through the control system, the needle ejection force and frequency can be controlled.

[0040] It can be seen that, compared with traditional pneumatic marking needles, the floating marking needle assembly of the present invention has at least the following technical advantages:

[0041] Firstly, traditional pneumatic marking needle assemblies cannot control the needle output frequency because they rely on a spring-loaded return mechanism. When the marking needle is propelled by compressed gas and moves to the position where the exhaust port is exposed to release pressure, the compressed spring releases its elastic potential energy, causing the marking needle to return to its original position. This cycle repeats, achieving self-vibration. Once the spring specifications are selected, the needle output frequency and its impact on the marking force are fixed and cannot be changed according to needs. Because each needle output is uncontrolled, it's impossible to determine the number of markings at the same position, resulting in uneven marking effects. In contrast, the floating marking needle assembly of this invention controls the opening and closing of a solenoid valve for each needle output. Each strike is controllable and stable, avoiding spring fatigue and breakage issues and improving the overall stability of the equipment.

[0042] Secondly, traditional pneumatic marking needle assemblies generally have low adaptability to height differences and require a high degree of flatness in the marking surface. They cannot adapt to marking parts of different heights, or to stepped surfaces, curved surfaces, inclined surfaces, or irregular undulating surfaces with significant height variations. This is because when marking workpieces with height differences, traditional marking needles have a limited spring compression ratio, which limits the compression distance. Furthermore, different needle extension distances result in different spring compression distances, causing variations in the force of each needle extension and the return needle speed, leading to frequency changes and inconsistent marking depth and density. In contrast, the floating marking needle assembly of this invention has no spring. It uses a specially designed air passage to suspend the marking needle using air pressure. This buoyancy can be maintained at a relatively constant state through convenient control of the air pressure supply, ensuring continuous stability and unaffected by changes in the marking needle position. Thus, the floating needle assembly can achieve a long needle extension distance and a large adaptability to height differences without affecting the force or frequency.

[0043] Secondly, traditional pneumatic marking needles have low energy efficiency and high noise levels. Furthermore, they have low marking force and high air consumption. This is because traditional pneumatic marking needles achieve self-vibration through a mechanical mechanism. During vibration, compressed gas needs to be continuously input. When the printing needle moves to the exhaust port, the compressed gas directly connects to the atmosphere for exhaust. This results in a large amount of compressed gas being directly discharged into the atmosphere unusable, significantly weakening the printing needle's driving force. It then relies mainly on inertial impact on the workpiece, leading to energy waste and excessive exhaust noise. In contrast, the floating marking needle assembly of this invention eliminates the direct connection between the internal compressed gas and the atmosphere during the continuous printing process. This allows the input compressed gas to be converted into the maximum possible thrust of the printing needle, resulting in more efficient use of the compressed gas's energy, increased marking force, improved energy efficiency, and significantly reduced air consumption. In addition, since the solenoid valve of the floating marking needle assembly of the present invention reverses when the needle returns to exhaust air, the input of compressed gas is shut off, and the compressed gas in the upper air chamber is discharged into the atmosphere through the exhaust port of the solenoid valve. Furthermore, since a silencer is installed at the exhaust port, the noise generated during the printing process can be significantly reduced.

[0044] In addition, compared with traditional electric needle assemblies, the floating marking needle assembly of the present invention still has at least the following technical advantages:

[0045] Firstly, traditional electric needle assemblies are also unable to mark surfaces with large height differences. This is because traditional electric needle assemblies still rely on springs to adapt to height differences, and they also introduce another problem: during the marking process, as the moving iron core moves, the magnetic gap between the electromagnetic poles continuously narrows. This change in magnetic gap leads to changes in magnetic force, causing both the marking force and the return force to vary with distance, making the electric needle unsuitable for marking under conditions of large height differences. In contrast, the floating marking needle assembly of this invention utilizes the switching of air pressure for both needle extension and return, freeing it from the constraints of springs and thus enabling it to effectively mark surfaces with large height differences.

[0046] Secondly, traditional electric needle assemblies cannot operate at high intensity for extended periods. This is because traditional electric needle assemblies are powered by electromagnetic coils, which require higher power, resulting in greater heat generation. The high-power coil's heat generation is limited by the on / off ratio, preventing the achievement of a suitable needle frequency. All of these factors make them unsuitable for prolonged, high-intensity operation. In contrast, the floating marking needle assembly of this invention controls the air supply through a solenoid valve, eliminating the heat generation limitation and thus enabling stable, long-term operation under high intensity.

[0047] Finally, it should be noted that any modifications, equivalent substitutions, or improvements made within the spirit and principles of this invention should be included within the scope of protection of this invention. Although specific embodiments of this invention have been described above in conjunction with the accompanying drawings, this is not intended to limit the scope of protection of this invention. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art without creative effort based on the technical solutions of this invention are still within the scope of protection of this invention.

Claims

1. A floating marking needle assembly, wherein, include: Float head seat; Solenoid valve, which is fixed on the float head seat; The needle cavity core is vertically inserted into the vertical inner cavity on the bottom surface of the float needle head seat; A printing needle is vertically inserted into the inner cavity of the needle chamber core, with its lower end located outside the needle chamber core; the upper part of the printing needle divides the inner cavity of the needle chamber core into an upper air chamber and a lower air chamber that are isolated from each other; the air outlet of the solenoid valve is connected to the upper air chamber. The needle inlet connector is connected to the air inlet of the solenoid valve, the air inlet is connected to the air outlet, and the solenoid valve also has an exhaust port connected to the air outlet. The needle cavity sleeve is fitted over the outside of the needle cavity core, and the needle cavity sleeve is connected to the float needle head seat and the upper end of the needle cavity core is tightly abutted against the top surface of the vertical inner cavity; the space between the needle cavity sleeve and the needle cavity core forms an air storage cavity, and the side wall of the needle cavity core has a vent hole that connects the lower air cavity and the air storage cavity. The return needle air inlet connector has its inner end connected to the air storage chamber.

2. The floating marking needle assembly according to claim 1, characterized in that, A needle seat is fixed on the upper outer wall of the printing needle. The needle seat is sealed to the inner cavity of the needle core, thereby dividing the inner cavity of the needle core into an upper air chamber and a lower air chamber that are isolated from each other, and allowing the printing needle to slide up and down along the inner cavity of the needle core.

3. The floating marking needle assembly according to claim 1, characterized in that, A first sealing ring is provided between the upper end of the needle core and the top surface of the vertical inner cavity, and the first sealing ring is fixed on the inner wall of the top surface of the vertical inner cavity.

4. The floating marking needle assembly according to claim 1, characterized in that, The lower side wall of the inner cavity of the needle core has a protruding receiving platform, on which a buffer washer is fixed, and the upper and lower spaces of the buffer washer are connected. The vent hole is opened on the side wall of the air storage cavity below the buffer washer.

5. The floating marking needle assembly according to claim 1, characterized in that, Furthermore, the outer diameter of the lower sidewall of the needle cavity core is smaller than the outer diameter of the upper sidewall, thereby forming an inward concave platform between the lower and upper sidewalls; the lower port of the needle cavity sleeve is a necked opening, and the inner wall of the necked opening tightly abuts against the lower surface of the inward concave platform; the outer wall of the needle cavity sleeve is threadedly connected to the inner wall of the vertical inner cavity, and the upper end of the needle cavity core tightly abuts against the top surface of the vertical inner cavity, thereby securing the needle cavity core in the vertical inner cavity.

6. The floating marking needle assembly according to claim 5, characterized in that, A second sealing ring is provided between the inner wall of the constricted opening and the lower surface of the recessed platform.

7. The floating marking needle assembly according to claim 1, characterized in that, It also includes a solenoid valve pad that supports the solenoid valve on the top surface of the float head seat.

8. The floating marking needle assembly according to claim 7, characterized in that, The solenoid valve pad is fixed to the top surface of the float head seat by fasteners.

9. The floating marking needle assembly according to claim 1, characterized in that, A silencer is installed in the exhaust passage of the solenoid valve.

10. The floating marking needle assembly according to claim 1, characterized in that, A guide bearing is provided between the lower port of the needle cavity core and the printing needle.

11. The floating marking needle assembly according to claim 1, characterized in that, The outer end of the return needle air inlet connector is connected to a compressed air source; the outer end of the outlet needle air inlet connector is connected to a compressed air source.

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