Laser cutting device for industrial fan production

Abstract

The application relates to the technical field of laser cutting and discloses a laser cutting device for industrial fan production, which comprises a cutting machine main body and a laser head arranged at the top of the cutting machine main body, and further comprises an adjusting mechanism arranged at the bottom of the laser head. The adjusting mechanism comprises a nozzle arranged at the bottom of the laser head, a plurality of shunt holes arranged in a ring array at the top of the nozzle, an air pipe arranged at the top of the shunt holes, a catheter arranged at the top of the nozzle in the middle, a lens arranged in the middle of the catheter, a plurality of through holes arranged in a ring array at the bottom of the catheter close to the filter, a ring cavity arranged in the nozzle, an inner sliding ring arranged at the top of the ring cavity close to the catheter, a bent hole arranged at the top of the inner sliding ring, a butt joint unit arranged on the inner wall of the bent hole, and a switching unit arranged on one side of the ring cavity away from the air pipe. The adjusting mechanism is arranged to switch between single-layer air jet and double-layer air jet working modes and to control the switching of the inner layer and the outer layer auxiliary gas.

Description

Technical Field

[0001] This invention relates to the field of laser cutting technology, and in particular to a laser cutting device for industrial fan production. Background Technology

[0002] Laser cutting equipment for industrial fan manufacturing is a key piece of equipment in the production of core components for modern fans, primarily undertaking high-precision and high-efficiency forming and processing tasks. Its core function lies in: enabling rapid, non-contact laser cutting of metal sheets for critical components such as fan impellers, blades, and volutes. This allows for precise handling of complex curves and microstructures, ensuring the accuracy of the blade's aerodynamic profile, thereby significantly improving the fan's aerodynamic efficiency and operational stability. Compared to traditional stamping processes, laser cutting eliminates the need for molds, offers high flexibility, and can quickly respond to small-batch, multi-specification production needs, significantly shortening the new product development cycle.

[0003] Traditional laser cutting machines are widely used in the fan manufacturing industry, but due to limitations in their structure and working principle, they often suffer from several significant problems. Regarding auxiliary gas switching, traditional equipment typically uses rigid pipe connections or manual valve groups for control, making gas changes cumbersome and time-consuming. This not only reduces equipment utilization but also affects the stability of cutting quality. For complex production tasks requiring frequent process switching, this inefficient switching mode becomes a clear bottleneck. Even more prominent is the compatibility issue of the nozzle system. Currently, single-layer and double-layer nozzles have vastly different designs and are not interchangeable. Single-layer nozzles are suitable for rapid cutting of thin plates, while double-layer nozzles, with their better airflow focusing and protection, are specifically designed for processing medium-thick plates or high-reflectivity materials. When production tasks involve different plate thicknesses or materials, operators must replace the entire nozzle assembly, involving multiple steps such as disassembly, cleaning, installation, and alignment. This is not only time-consuming and labor-intensive but also prone to assembly errors leading to cutting focus shift or gas leakage, directly affecting processing accuracy and yield. These two major technical deficiencies together result in lengthy equipment preparation time and increased operational complexity. Summary of the Invention

[0004] Given the cumbersome ventilation process of existing laser cutting machines and the incompatibility between single-layer and double-layer nozzles, a laser cutting device for industrial fan production is proposed.

[0005] The purpose is to make the laser cutting machine switch gases more quickly and to make the nozzle compatible with single-layer and double-layer working modes.

[0006] The technical solution of the present invention is a laser cutting device for industrial fan production, including a cutting machine body, a laser head disposed on the top of the cutting machine body, and an adjustment mechanism disposed on the bottom of the laser head;

[0007] The adjustment mechanism includes a nozzle located at the bottom of the laser head, several annular arrays of diversion holes at the top of the nozzle, an air tube located at the top of the diversion holes, a conduit located at the center of the top of the nozzle, a lens located in the middle of the conduit, several annular arrays of through holes located near the bottom of the filter in the conduit, an annular cavity located inside the nozzle, an inner slip ring located at the top of the annular cavity near the conduit, a bend located at the top of the inner slip ring, a docking unit located on the inner wall of the top of the bend, and a switching unit located on the side of the top of the annular cavity away from the air tube.

[0008] The endotracheal tube transmits auxiliary gas to the diversion orifice, which diverts the auxiliary gas. As the inner slip ring rotates, it drives the bend to rotate as well. Once the bend rotates to align with any of the diversion orifices, it guides the auxiliary gas in the corresponding diversion orifice into the inside of the endotracheal tube.

[0009] Furthermore, the bottom of the diversion hole is provided with two branch holes, both of which are connected to the annular cavity.

[0010] Furthermore, the bent hole has an L-shaped shape, and the diameter of the bent hole is the same as that of the through hole.

[0011] Furthermore, the switching unit includes an outer slip ring disposed on the top of the annular cavity away from the trachea, a straight hole opened on the side of the outer slip ring near the bend, a docking unit also disposed on the top of the straight hole, an inner toothed ring disposed on the outer side of the inner slip ring, an outer toothed ring disposed on the inner side of the outer slip ring, a shaped hole opened on the top of the nozzle, a rotating shaft disposed inside the shaped hole, a drive wheel disposed at the bottom of the rotating shaft, a knob disposed on the top of the rotating shaft, a baffle disposed on the end of the rotating shaft near the knob, and a return spring disposed at the bottom of the baffle, the top and bottom of the return spring abutting against the baffle and the shaped hole respectively.

[0012] Furthermore, the diameter of the straight hole is the same as that of the diversion hole, and an annular groove is formed at the top of the straight hole.

[0013] Furthermore, a receiving cavity is provided near the baffle of the irregularly shaped hole, and a retaining ring is provided at the top of the receiving cavity.

[0014] Furthermore, the docking unit includes an ejector spring disposed on the inner wall of the top of the bend, a sliding sleeve disposed on the top of the ejector spring, and a sealing ring disposed on the outer side of the sliding sleeve.

[0015] Furthermore, the sliding sleeve is tapered in shape, and a deep hole extending from the top to the bottom is provided on the top of the sliding sleeve. The two docking units have the same structure.

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

[0017] 1. An adjustment mechanism is provided to switch between single-layer and double-layer airflow modes. By operating the adjustment mechanism, the equipment can switch between different airflow modes to adapt to diverse processing needs. The single-layer airflow mode is suitable for conventional cutting scenarios and meets basic processing requirements, while the double-layer airflow mode is designed for specific working conditions. By adjusting the gas output method, the gas assistance effect during the cutting process is optimized. This mode switching function broadens the application range of the equipment, enabling it to cope with cutting tasks of different materials, thicknesses, or process requirements, and improving the equipment's adaptability in various processing scenarios.

[0018] 2. By setting up a switching unit to control the switching between the inner and outer auxiliary gases, operators can flexibly combine the inner and outer gases according to the actual working conditions. Through this unit, the equipment can select a single gas path or combine different gases. For example, the inner and outer layers can be set to use the same gas, or different gases can be configured for each. This combination method makes the adjustment of the cutting process more direct to adapt to the processing requirements of different materials or thicknesses. This function enhances the equipment's ability to cope with complex working conditions and provides an operational basis for optimizing cutting quality.

[0019] 3. By setting up a docking unit, the connection accuracy between the inner and outer slip rings and the flow divider hole is achieved. The design of this unit is intended to ensure the accuracy of the docking process, so that the inner and outer rings can be precisely aligned with the flow divider hole when connected. At the same time, it also ensures the sealing of the connection, preventing gas leakage during the transportation process. Through this reliable docking, the gas can flow stably along the preset path, providing continuous auxiliary support for the cutting operation. This function is the foundation for the stable operation of the equipment, ensuring the integrity of the gas supply system, thereby maintaining the stability of the cutting process. Attached Figure Description

[0020] Figure 1 This is a three-dimensional structural diagram of the entire invention;

[0021] Figure 2 This is a schematic diagram showing the relative positions of the nozzle and the air pipe of the present invention;

[0022] Figure 3 This is a schematic diagram of the internal structure of the nozzle of the present invention;

[0023] Figure 4 This is a schematic diagram of the connection between the conduit and the nozzle of the present invention;

[0024] Figure 5 This is a schematic diagram of the through-hole structure of the present invention;

[0025] Figure 6 This is a schematic diagram of the nozzle and flow divider structure of the present invention;

[0026] Figure 7This is a schematic diagram of the inner and outer slip ring structures of the present invention;

[0027] Figure 8 This is a schematic diagram of the straight hole and curved hole structure of the present invention;

[0028] Figure 9 This is a cross-sectional view of the nozzle of the present invention;

[0029] Figure 10 This is a schematic diagram of the connection between the rotating shaft and the irregular hole of the present invention;

[0030] Figure 11 This is a schematic diagram of the irregular hole structure of the present invention;

[0031] Figure 12 This is a schematic diagram of the sliding sleeve structure of the present invention.

[0032] In the picture:

[0033] 1. Cutting machine body; 2. Laser head; 3. Adjustment mechanism; 31. Nozzle; 32. Diverter hole; 33. Air pipe; 34. Guide tube; 35. Lens; 36. Through hole; 37. Annular cavity; 38. Inner slip ring; 39. Bend hole; 310. Outer slip ring; 311. Straight hole; 312. Inner toothed ring; 313. Outer toothed ring; 314. Irregular hole; 315. Rotating shaft; 316. Drive wheel; 317. Knob; 318. Baffle plate; 319. Return spring; 320. Ejection spring; 321. Sliding sleeve; 322. Sealing ring. Detailed Implementation

[0034] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0035] Example 1, referring to Figures 1-12This invention provides a first embodiment of a laser cutting device for industrial fan production, comprising a cutting machine body 1, a laser head 2 fixedly connected to the top of the cutting machine body 1, and an adjustment mechanism 3 installed at the bottom of the laser head 2. The adjustment mechanism 3 includes a nozzle 31 fixedly connected to the bottom of the laser head 2, several annular arrays of diversion holes 32 opened at the top of the nozzle 31, an air pipe 33 fixedly connected to the top of the diversion holes 32, a conduit 34 fixedly connected to the center of the top of the nozzle 31, a lens 35 fixedly connected to the middle of the conduit 34, and several annular arrays of through holes opened near the bottom of the filter in the conduit 34. 36. An annular cavity 37 is formed inside the nozzle 31. An inner slip ring 38 is rotatably connected to the top of the annular cavity 37 near the conduit 34. A bend 39 is formed on the top of the inner slip ring 38. A docking unit is assembled on the inner wall of the top of the bend 39. A switching unit is assembled on the side of the top of the annular cavity 37 away from the air tube 33. The air tube 33 transmits the auxiliary gas to the diversion hole 32. The diversion hole 32 diverts the auxiliary gas. When the inner slip ring 38 rotates, it drives the bend 39 to rotate as well. After the bend 39 rotates to align with any one of the diversion holes 32, it guides the auxiliary gas in the corresponding diversion hole 32 into the conduit 34.

[0036] Specifically, several tubing 33 introduce different gases into corresponding diversion holes 32. As the inner slip ring 38 rotates, it drives the bend 39 to rotate as well. Once the bend 39 aligns with any diversion hole 32, the gas in that diversion hole 32 enters the interior of the bend 39. Simultaneously, the bend 39 aligns with the diversion hole 32 and with the corresponding through hole 36 in the same direction. Therefore, the gas inside the diversion hole 32 aligned with the bend 39 enters the interior of the conduit 34 through the bend 39 and the corresponding through hole 36, and is blown out through the bottom of the conduit 34. While the inner slip ring 38 aligns with any diversion hole 32, the other diversion holes 32 are sealed by the top surface of the inner slip ring 38 to prevent mixing of different gases and to prevent them from aligning with the bend 32. The other through holes 36 aligned with 9 are also closed by the inner slip ring 38. Therefore, the gas entering the conduit 34 cannot escape through the other through holes 36 and can only be discharged through the bottom of the air pipe 33. By adjusting the setting of the mechanism 3, the two working modes of single-layer jetting and double-layer jetting can be switched. By operating this mechanism, the equipment can switch between different jetting modes to adapt to diverse processing needs. Single-layer jetting is suitable for conventional cutting scenarios and meets basic processing requirements. Double-layer jetting is for specific working conditions. By changing the gas output mode, the gas assistance effect during the cutting process is optimized. This mode switching function expands the applicability of the equipment, enabling it to cope with cutting tasks with different materials and thicknesses or process requirements, and enhances the adaptability of the equipment in various processing environments.

[0037] Reference Figure 4The bottom of the diversion hole 32 is provided with two branch holes, both of which are connected to the annular cavity 37.

[0038] Specifically, the diversion hole 32 divides the flowing air into two streams through two branch holes. The airflow on the side closer to the conduit 34 will be guided into the conduit 34 by the bend before entering the annular cavity 37. The other stream of air will be blown out through the bottom of the annular cavity 37 after entering the annular cavity 37.

[0039] Reference Figure 8 and Figure 9 The bend 39 has an L-shaped shape, and the diameter of the bend 39 is the same as that of the through hole 36.

[0040] Specifically, the bend 39 guides the direction of airflow by its own bending, so that the airflow enters the through hole 36 that is connected to it. The bend 39 and the through hole 36 have the same diameter, so that the airflow remains stable when passing through the connection between the two.

[0041] Example 2, refer to Figures 1-12 This is the second embodiment of the present invention. This embodiment differs from the first embodiment in that: the switching unit includes an outer slip ring 310 rotatably connected to the top of the annular cavity 37 on the side away from the air pipe 33, a straight hole 311 opened on the side of the outer slip ring 310 near the bend 39, a docking unit is also provided on the top of the straight hole 311, an inner toothed ring 312 fixedly connected to the outside of the inner slip ring 38, an outer toothed ring 313 fixedly connected to the inside of the outer slip ring 310, a shaped hole 314 opened on the top of the nozzle 31, a rotating shaft 315 slidably connected inside the shaped hole 314, a drive wheel 316 fixedly connected to the bottom of the rotating shaft 315, a knob 317 fixedly connected to the top of the rotating shaft 315, a baffle 318 fixedly connected to the end of the rotating shaft 315 near the knob 317, and a return spring 319 abutting against the bottom of the baffle 318. The top and bottom of the return spring 319 abut against the baffle 318 and the shaped hole 314, respectively.

[0042] Specifically, rotating the knob 317 drives the rotating shaft 315 to rotate. Simultaneously, the rotating shaft 315 drives the drive wheel 316 to rotate, which in turn drives the internal gear ring 312 to rotate. The internal gear ring 312's rotation, in turn, drives the internal slip ring 38 to rotate. By rotating the internal slip ring 38 at different angles, the bent hole 39 aligns with different branch holes 32, thereby guiding the gas from the different branch holes 32 to the through hole 36 in the same direction. The gas then enters the conduit 34 through the through hole 36 and is finally discharged through the conduit 34. Pressing down... Pressing knob 317 causes it to move shaft 315 and baffle 318 downwards together. Shaft 315 then moves drive wheel 316 downwards. As baffle 318 moves downwards, it compresses return spring 319. After moving a certain distance, baffle 318 is blocked by retaining ring in the receiving cavity, preventing it from moving further downwards. At this point, drive wheel 316 and external gear ring 313 are at the same height and are meshed. Pressing and rotating knob 317 maintains the pressure on knob 317. Knob 317 rotates through shaft 315 and drive wheel 316. Rotating the external gear ring 313 causes the external slip ring 310 to rotate as well. The external slip ring 310 then causes the straight hole 311 to rotate as well. The straight hole 311, through rotation, can align with different branch holes of the diversion holes 32, allowing gas from the diversion holes 32 to enter the annular cavity 37 through the branch holes and ultimately exit through the annular cavity 37. When the branch hole rotates to a position where it no longer coincides with any diversion hole 32, the gas from the diversion holes 32 will no longer be able to enter the annular cavity 37. After adjusting the external slip ring 310 to the desired position, releasing the pressure on the knob 317 will cause it to return to its reset position. The device resets under the action of spring 319. By configuring a switching unit, the inner and outer auxiliary gases can be switched. Operators can flexibly match the inner and outer gases according to the actual processing conditions. With the help of this unit, the equipment can select a single gas path or combine different gases. For example, the inner and outer layers can be set to use the same gas, or different gases can be configured for each. This flexible matching method makes the adjustment of the cutting process more convenient and can meet the processing requirements of different materials and thicknesses. This function improves the equipment's ability to cope with complex working conditions and lays the operational foundation for optimizing cutting quality.

[0043] Reference Figures 3-8 The diameter of the straight hole 311 is the same as that of the diversion hole 32, and an annular groove is provided on the top of the straight hole 311.

[0044] Specifically, the straight hole 311 accommodates the docking unit through the annular groove and enhances the airtightness during docking through the docking unit. The same annular groove is also provided on the eastern side of the bent hole 39.

[0045] Reference Figure 10 and Figure 11 The irregular hole 314 has a receiving cavity near the baffle 318, and a retaining ring is provided on the top of the receiving cavity.

[0046] Specifically, the irregular hole 314 provides the space required for the displacement of the baffle 318 and the return spring 319 through the receiving cavity, and the retaining ring restricts the range of movement of the baffle 318, so that the retaining ring can only move within a limited range.

[0047] Reference Figures 1-12 The docking unit includes an ejector spring 320 fixedly connected to the inner wall of the top of the bend 39, a sliding sleeve 321 fixedly connected to the top of the ejector spring 320, and a sealing ring 322 fixedly connected to the outside of the sliding sleeve 321.

[0048] Specifically, the ejector spring 320 keeps the sliding sleeve 321 moving upward. After the sliding sleeve 321 is aligned with any diversion hole 32, it will cooperate with the bottom end of the corresponding diversion hole 32 to ensure the stability and accuracy of the docking. The sealing ring 322 ensures the airtightness during gas transmission. By configuring the docking unit, the connection accuracy between the inner slip ring 38 and the outer slip ring 310 and the diversion hole 32 is ensured. The design goal of this unit is to ensure that the docking process is accurate and error-free, so that the inner and outer slip rings 310 and the diversion hole 32 can achieve precise alignment. At the same time, this structure also effectively ensures the sealing performance of the connection part and avoids gas leakage during transmission. With the help of this reliable docking method, the gas can be stably delivered along the preset path, providing continuous assistance for the cutting process. This function forms the basis for the stable operation of the equipment, ensures the integrity of the gas supply system, and thus maintains the stability of the cutting process.

[0049] Reference Figures 8-12 The sliding sleeve 321 has a conical shape, and a deep hole extending from the top to the bottom is provided on the top of the sliding sleeve 321. The two docking units have the same structure.

[0050] Specifically, when the sliding sleeve 321 is connected to any diversion hole 32, the gas in the diversion hole 32 will pass through the sliding sleeve 321. The sliding sleeve 321 is connected to the diversion hole 32 through the tapered surface. When the force of the relative movement between the sliding sleeve 321 and the diversion hole 32 is greater than the force of the ejector spring 320, the retaining ring will move down and squeeze the ejector spring 320 until the retaining ring is connected to the diversion hole 32 again. The rest of the structure is the same as the structure of Embodiment 1.

[0051] Based on embodiments 1-2, the working principle of the present invention is as follows: Before the device is started, the rotating knob 317 drives the rotating shaft 315 to rotate. The rotation drives the internal gear ring 312 to rotate through the drive wheel 316. The internal gear ring 312 rotates at the same time, driving the internal slip ring 38 to rotate. The internal slip ring 38 drives the bent hole 39 to rotate. By adjusting the position of the bent hole 39, it is made to connect with different diversion holes 32 and straight holes 311. After the bent hole 39 is connected with any diversion hole 32, the airflow inside it will be guided into the corresponding straight hole 311. The airflow enters the conduit 34 through the straight hole 311 and is blown out through the bottom of the conduit 34. Different air pipes 33 are connected to different auxiliary gas sources. By connecting the bent hole 39 with different diversion holes 32, different gases can be blown out of the conduit 34.

[0052] When the dual-layer air blowing mode is required, press the knob 317 to move it downwards to its maximum stroke. The knob 317 drives the rotating shaft 315 and the baffle 318 to move synchronously. The downward movement of the baffle 318 causes the return spring 319 to store force. After the rotating shaft 315 moves to its maximum stroke along with the knob 317, the drive wheel 316 will also move to the position where it meshes with the external gear ring 313. At this time, while keeping the knob 317 pressed, it is rotated. The drive wheel 316 causes the external gear ring 313 and the outer slip ring 310 to rotate. The outer slip ring 310 rotates simultaneously with the external gear ring 313. When the straight hole 311 is moved, it can guide the gas in the corresponding branch hole 32 to the annular cavity 37 after the straight hole 311 is moved to connect with any branch hole 32. The gas entering the annular cavity 37 is blown out through the bottom of the annular cavity 37. When the straight hole 311 is moved to the point where it is not connected with any branch hole 32, the branch holes of all branch holes 32 on the side away from the conduit 34 are closed. At this time, no gas is blown out in the middle of the annular cavity 37. At this time, the equipment is in single-layer mode. When gas is blown out in both the annular cavity 37 and the conduit 34, the equipment is in double-layer mode.

[0053] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A laser cutting device for industrial fan production, comprising a cutting machine body (1) and a laser head (2) disposed on the top of the cutting machine body (1), characterized in that: It also includes an adjustment mechanism (3) located at the bottom of the laser head (2); The adjustment mechanism (3) includes a nozzle (31) disposed at the bottom of the laser head (2), a plurality of annular arrays of diversion holes (32) opened at the top of the nozzle (31), an air tube (33) disposed at the top of the diversion holes (32), a conduit (34) disposed at the center of the top of the nozzle (31), a lens (35) disposed at the middle of the conduit (34), a plurality of annular arrays of through holes (36) opened at the bottom of the conduit (34) near the filter, an annular cavity (37) disposed inside the nozzle (31), an inner slip ring (38) disposed at the top of the annular cavity (37) near the conduit (34), a bend (39) disposed at the top of the inner slip ring (38), a docking unit disposed on the inner wall of the top of the bend (39), and a switching unit disposed on the side of the top of the annular cavity (37) away from the air tube (33). The trachea (33) transmits the auxiliary gas to the diversion hole (32), the diversion hole (32) diverts the auxiliary gas, and the inner slip ring (38) rotates while driving the bend (39) to rotate together. After the bend (39) rotates to align with any one of the diversion holes (32), the auxiliary gas in the corresponding diversion hole (32) is guided into the conduit (34). The switching unit includes an outer slip ring (310) located on the top of the annular cavity (37) away from the air tube (33), a straight hole (311) on the side of the outer slip ring (310) near the bend (39), a docking unit also located on the top of the straight hole (311), an inner toothed ring (312) located on the outside of the inner slip ring (38), an outer toothed ring (313) located on the inside of the outer slip ring (310), and a shaped hole (314) located on the top of the nozzle (31). A rotating shaft (315) is set inside the irregular hole (314), a drive wheel (316) is set at the bottom of the rotating shaft (315), a knob (317) is set at the top of the rotating shaft (315), a baffle (318) is set at one end of the rotating shaft (315) near the knob (317), and a return spring (319) is set at the bottom of the baffle (318). The top and bottom of the return spring (319) abut against the baffle (318) and the irregular hole (314) respectively.

2. The laser cutting device for industrial fan production according to claim 1, characterized in that: The bottom of the diversion hole (32) is provided with two branch holes, both of which are connected to the annular cavity (37).

3. The laser cutting device for industrial fan production according to claim 1, characterized in that: The bent hole (39) is L-shaped, and the diameter of the bent hole (39) is the same as that of the through hole (36).

4. The laser cutting device for industrial fan production according to claim 1, characterized in that: The diameter of the straight hole (311) is the same as that of the diversion hole (32), and an annular groove is provided at the top of the straight hole (311).

5. The laser cutting device for industrial fan production according to claim 1, characterized in that: The irregular hole (314) has a receiving cavity near the baffle (318), and a retaining ring is provided on the top of the receiving cavity.

6. The laser cutting device for industrial fan production according to claim 1, characterized in that: The docking unit includes an ejector spring (320) disposed on the inner wall of the top of the bend (39), a sliding sleeve (321) disposed on the top of the ejector spring (320), and a sealing ring (322) disposed on the outside of the sliding sleeve (321).

7. The laser cutting device for industrial fan production according to claim 6, characterized in that: The sliding sleeve (321) is conical in shape, and a deep hole extending from the top to the bottom is provided on the top of the sliding sleeve (321). The two docking units have the same structure.

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