Mechanical gripper for nozzle match

Abstract

The utility model is applicable to the technical field of nozzle matched tools, and provides a nozzle matched tool mechanical gripper which comprises a handheld rod, an outer circular ring, two fixing pins and an inner circular ring, the outer wall of the outer circular ring is fixedly connected to the top of the handheld rod, and the two fixing pins are rotatably connected to the inner walls of the two sides of the top end of the outer circular ring. By means of the first sliding sleeve, the threaded sleeve, the second sliding sleeve, the fixing block, the L-shaped support, the telescopic rod, the sliding block, the clamping unit, the tooth groove, the gear and the spherical sliding groove, when a long nozzle needs to be clamped, the threaded sleeve is rotated to drive the first sliding sleeve to move, the first sliding sleeve pulls the sliding block to move through the telescopic rod, and then the sliding block drives the two arc blocks to be opened or closed through the clamping unit. And when the long nozzle needs to be deflected, the second sliding sleeve slides to drive the inner circular ring and the arc block to deflect, so that the long nozzle is inclined, the hand does not need to stretch to the front end for operation, and the mechanical gripper is more convenient and safer to use.

Description

Technical Field

[0001] The utility model belongs to the technical field of water inlet fixtures, and in particular relates to a mechanical gripper for a water inlet fixture. Background Art

[0002] In the process of producing steel products by continuous casting machine, the molten steel heated into liquid needs to be placed in a ladle and transported to the top of the tundish; then, the molten steel is poured into the tundish. In order to avoid oxidation and splashing of the molten steel, a long shroud is usually installed at the lower end of the sliding shroud at the bottom of the ladle. The long shroud usually has good mechanical properties, seismic resistance, and resistance to corrosion by molten steel and slag. It is usually made of molten quartz and aluminum carbon. One end of the long shroud is connected to the lower end of the sliding shroud, and the other end is inserted into the molten steel in the tundish for sealed and protected pouring; the molten steel flowing into the tundish through the long shroud enters the crystallizer through a pipe, and the crystallizer cools the liquid molten steel into a solid billet.

[0003] Based on the continuity of production, after each ladle of molten steel is poured, the shroud needs to be separated from the empty ladle and reconnected with the new ladle. This action is called ladle changing, which is one of the most frequent process actions in the continuous casting machine production. In the traditional ladle changing action, the separation or connection of the shroud and the ladle is achieved by the operator manually operating a mechanical gripper. The front end of the existing mechanical gripper is provided with a freely rotatable circular sleeve, which needs to be inserted from the bottom of the preheated shroud. At this time, another person is required to use tools to assist, which is inconvenient to operate. In addition, the ladle changing space is small, and the operator needs to extend his hand to the front end to rotate the circular sleeve to tilt the shroud before entering the bottom of the ladle. Since the front end is close to the molten steel pool, the operator's hand is easily scalded by the splashing molten steel when it reaches the front end, which is not safe. In order to make the mechanical gripper more convenient and safe to use, a shroud race mechanical gripper is now provided. Utility Model Content

[0004] The utility model provides a mechanical gripper for a water inlet game, aiming to solve the problems mentioned in the above background technology.

[0005] The utility model is implemented as follows: a mechanical gripper for a water gate race, comprising a hand-held rod, an outer ring, a fixing pin, and an inner ring; the outer wall of the outer ring is fixedly connected to the top of the hand-held rod; two fixing pins are rotatably connected to the inner walls on both sides of the top of the outer ring, and one end of the fixing pin penetrates into the inner part of the outer ring; the inner ring is fixedly connected between the two fixing pins; the tops of the two inner rings are rotatably connected with arc blocks, and the two arc blocks are symmetrically distributed; a convenient operating mechanism is provided between the hand-held rod and the inner ring;

[0006] The convenient operating mechanism includes a supporting component and a clamping component;

[0007] The support assembly is used to provide support for the clamping assembly, so that the operator can use it to hold the assembly and extend the distance between the operator and the clamping assembly.

[0008] The clamping assembly is used for an operator to remotely clamp and release the shroud.

[0009] Preferably, the support assembly comprises a first sliding sleeve, a threaded sleeve, a second sliding sleeve, a fixing block, an L-shaped bracket, and a telescopic rod;

[0010] The first sliding sleeve is slidably connected to the outer wall of the hand-held rod, the threaded sleeve is threadedly connected to the outer wall of the hand-held rod, and the top end of the threaded sleeve is rotatably connected to the outer wall of the bottom end of the first sliding sleeve, and the second sliding sleeve is slidably connected to the outer wall of the threaded sleeve;

[0011] The fixed block and the telescopic rod are provided with two, and the two fixed blocks are symmetrically fixedly connected to the outer wall of the top end of the first sliding sleeve, the bottom ends of the two telescopic rods are respectively fixedly connected to the tops of the two fixed blocks, and the top ends of the telescopic rods pass through the outer ring, and the L-shaped brackets are provided with two, and the two L-shaped brackets are symmetrically fixedly connected to the outer wall of the top end of the second sliding sleeve, and the top ends of the L-shaped brackets pass through the fixed block and the outer ring.

[0012] Preferably, the clamping assembly comprises a slider, a clamping unit, a tooth groove, a gear, and a spherical slide groove;

[0013] The tooth groove is opened at the top of the L-shaped bracket, the gear is fixedly connected to one end of the fixing pin penetrating into the inner part of the outer ring, and the gear is meshed with the tooth groove;

[0014] The clamping unit is arranged on the outer wall of the arc block, the slider is slidably connected to the fixing pin, the spherical slide groove is opened on the outer wall of the bottom end of the slider, and the top end of the telescopic rod is slidably connected to the spherical slide groove;

[0015] The clamping unit includes a concave connecting block, a fixed shaft, and a rotating plate;

[0016] The concave connecting block is fixedly connected to the outer wall of the arc block, the fixed shaft is fixedly connected to the concave connecting block, one end of the rotating plate is rotatably connected to the concave connecting block, and the other end is rotatably connected to the top of the outer ring, and the upper and lower ends of the rotating plate are respectively tightly attached to the inner wall of the concave connecting block and the inner wall of the slider.

[0017] Preferably, the top of the slider is square, the bottom is arc-shaped, and a square groove for connecting the rotating plate is provided at the top of the slider.

[0018] Preferably, the top of the telescopic rod can be freely extended and retracted, and a ball is formed on the top of the telescopic rod. The ball is slidably connected to the spherical slide groove, and a circular groove for the ball to engage is opened on the inner wall of the spherical slide groove at the center of the bottom end of the slider.

[0019] Preferably, the outer wall of the hand-held rod is divided into three types: a smooth outer wall, a threaded outer wall, and an outer wall with a limiting protrusion, and the corresponding sections of the three outer walls have diameters from large to small.

[0020] Preferably, the inner wall of the first sliding sleeve is slidably connected to the outer wall of the hand-held rod with a limiting protrusion, and the threaded sleeve is threadedly connected to the outer wall of the hand-held rod with a thread.

[0021] Preferably, the outer diameter of the lower part of the threaded sleeve is larger, and the outer diameter of the upper part is smaller, the inner diameter of the threaded sleeve is consistent with the outer diameter of the first sliding sleeve, and the inner diameter of the second sliding sleeve is consistent with the outer diameter of the upper part of the threaded sleeve.

[0022] Compared with the prior art, the embodiments of the present application have the following beneficial effects:

[0023] The utility model comprises a first sliding sleeve, a threaded sleeve, a second sliding sleeve, a fixed block, an L-shaped bracket, a telescopic rod, a sliding block, a clamping unit, a tooth groove, a gear, and a spherical sliding groove. When the long water outlet needs to be clamped, the threaded sleeve is rotated to drive the first sliding sleeve to move, and the first sliding sleeve pulls the sliding block to move through the telescopic rod, and the sliding block then drives the two arc blocks to open or close through the clamping unit, so as to realize rapid clamping of the long water outlet. When the long water outlet needs to be deflected, the second sliding sleeve is slid, so as to drive the inner ring and the arc block to deflect, so that the long water outlet is tilted, and there is no need to reach to the front end for operation, so that the mechanical gripper is more convenient and safer to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural schematic diagram provided by the utility model;

[0025] Figure 2 It is an exploded view of the hand-held rod provided by the utility model;

[0026] Figure 3 It is a schematic diagram of the top structure of the hand-held rod provided by the utility model;

[0027] Figure 4 This is a schematic diagram of the inner structure of the outer ring provided by the utility model;

[0028] Figure 5 It is an exploded view of the clamping unit provided by the utility model.

[0029] In the figure: 1. Hand-held rod; 2. Outer ring; 3. Fixed pin; 4. Inner ring; 5. Arc block; 6. First sliding sleeve; 7. Threaded sleeve; 8. Second sliding sleeve; 9. Fixed block; 10. L-shaped bracket; 11. Telescopic rod; 12. Sliding block; 13. Clamping unit; 14. Tooth groove; 15. Gear; 16. Spherical slide groove; 1301. Concave connecting block; 1302. Fixed shaft; 1303. Rotating plate. DETAILED DESCRIPTION

[0030] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by technicians in the technical field of this application; the terms used in the specification of the application herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, not to describe a specific order.

[0031] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0032] The utility model embodiment provides a mechanical gripper for a water inlet game, such as Figure 1-5 As shown, it includes a hand-held rod 1, an outer ring 2, a fixing pin 3, and an inner ring 4. The outer wall of the outer ring 2 is fixedly connected to the top of the hand-held rod 1, two fixing pins 3 are rotatably connected to the inner walls on both sides of the top of the outer ring 2, and one end of the fixing pin 3 penetrates into the inner part of the outer ring 2, the inner ring 4 is fixedly connected between the two fixing pins 3, the tops of the two inner rings 4 are rotatably connected with arc blocks 5, and the two arc blocks 5 are symmetrically distributed, and a convenient operating mechanism is provided between the hand-held rod 1 and the inner ring 4;

[0033] The convenient operating mechanism includes a supporting component and a clamping component;

[0034] The support assembly is used to provide support for the clamping assembly, so that the operator can use it to hold the assembly to extend the distance between the operator and the clamping assembly.

[0035] The clamping assembly is used for the operator to remotely clamp and release the shroud;

[0036] The support assembly includes a first sliding sleeve 6, a threaded sleeve 7, a second sliding sleeve 8, a fixing block 9, an L-shaped bracket 10, and a telescopic rod 11;

[0037] The first sliding sleeve 6 is slidably connected to the outer wall of the hand-held rod 1, the threaded sleeve 7 is threadedly connected to the outer wall of the hand-held rod 1, and the top of the threaded sleeve 7 is rotatably connected to the outer wall of the bottom end of the first sliding sleeve 6, and the second sliding sleeve 8 is slidably connected to the outer wall of the threaded sleeve 7;

[0038] Two fixed blocks 9 and telescopic rods 11 are provided, and the two fixed blocks 9 are symmetrically fixedly connected to the outer wall of the top end of the first sliding sleeve 6, and the bottom ends of the two telescopic rods 11 are respectively fixedly connected to the tops of the two fixed blocks 9, and the top ends of the telescopic rods 11 pass through the outer ring 2, and two L-shaped brackets 10 are provided, and the two L-shaped brackets 10 are symmetrically fixedly connected to the outer wall of the top end of the second sliding sleeve 8, and the top ends of the L-shaped brackets 10 pass through the fixed blocks 9 and the outer ring 2;

[0039] The clamping assembly includes a slider 12, a clamping unit 13, a tooth groove 14, a gear 15, and a spherical slide groove 16;

[0040] The tooth groove 14 is provided at the top of the L-shaped bracket 10, and the gear 15 is fixedly connected to one end of the fixing pin 3 penetrating into the inner part of the outer ring 2, and the gear 15 is meshed with the tooth groove 14;

[0041] The clamping unit 13 is arranged on the outer wall of the arc block 5, the slider 12 is slidably connected to the fixing pin 3, the spherical slide groove 16 is opened on the outer wall of the bottom end of the slider 12, and the top end of the telescopic rod 11 is slidably connected to the spherical slide groove 16;

[0042] The clamping unit 13 includes a concave connection block 1301, a fixed shaft 1302, and a rotating plate 1303;

[0043] The concave connection block 1301 is fixedly connected to the outer wall of the arc block 5, the fixed shaft 1302 is fixedly connected to the concave connection block 1301, one end of the rotating plate 1303 is rotatably connected to the concave connection block 1301, and the other end is rotatably connected to the top of the outer ring 2, and the upper and lower ends of the rotating plate 1303 are respectively close to the inner wall of the concave connection block 1301 and the inner wall of the slider 12

[0044] The outer diameter of the lower part of the threaded sleeve 7 is larger, and the outer diameter of the upper part is smaller. The inner diameter of the threaded sleeve 7 is consistent with the outer diameter of the first sliding sleeve 6, and the inner diameter of the second sliding sleeve 8 is consistent with the outer diameter of the upper part of the threaded sleeve 7.

[0045] In this embodiment, it is necessary to add that: when replacing the long shroud, the long shroud needs to be placed in a heating furnace for preheating and can only be used when it reaches a certain temperature;

[0046] When it is necessary to clamp the long water outlet, first rotate the threaded sleeve 7 downward, thereby driving the first sliding sleeve 6 to slide downward, thereby pulling the two sliders 12 downward through the telescopic rods 11 on the two fixed blocks 9, and the slider 12 will pull one end of the rotating plate 1303 to move downward, and at the same time, the other end of the rotating plate 1303 will pull the concave connecting block 1301 to move to both sides, so that the two arc blocks 5 are opened to both sides. At this time, the inner ring 4 is close to the surface of the long water outlet, and then the threaded sleeve 7 is rotated upward, thereby moving up through the first sliding sleeve 6, and pushing the slider 12 up through the telescopic rod 11. The top of the slider 12 will push the rotating plate 1303 upward, and the rotating plate 1303 pushes the arc block 5 to the center. At the same time, the two ends of the rotating plate 1303 rotate with the top of the slider 12 and the fixed shaft 1302 respectively, so that the upward thrust of the slider 12 and thus the vertical force becomes horizontal, so that the two arc blocks 5 are closed and the long water outlet is clamped;

[0047] At this time, hold the holding rod 1 and move the long water nozzle to the replacement area. Since the replacement area is lower, the long water nozzle needs to be tilted to enter. At this time, slide the second sliding sleeve 8 on the outer wall of the threaded sleeve 7. The second sliding sleeve 8 will drive the L-shaped bracket 10 to move. The movement of the L-shaped bracket 10 will drive the gear 15 to rotate through the tooth groove 14, thereby making the inner ring 4 connected to the fixing pin 3 rotate, and the arc block 5 will also rotate with it. At this time, the long water nozzle will be tilted, and there is no need to reach to the front end to operate it to avoid burns. Move the long water nozzle to the bottom of the installation port, slide the second sliding sleeve 8 in the opposite direction again to make the long water nozzle return to the center, and after installing the long water nozzle in place, rotate the threaded sleeve 7 again to open the arc block 5 and separate the mechanical gripper from it. At this time, the replacement and installation of the long water nozzle is completed.

[0048] In a further preferred embodiment of the present invention, Figure 5 As shown, the top of the slider 12 is square, the bottom is arc-shaped, and a square groove for connecting the rotating plate 1303 is provided at the top of the slider 12.

[0049] In this embodiment, when the top of the slider 12 moves upward against the rotating plate 1303, the rotating plate 1303 will deflect, thereby changing the thrust direction, and the deflection of the rotating plate 1303 is limited by the concave connecting block 1301 and the square groove at the top of the slider 12, so that the rotating plate 1303 can only rotate to 90 degrees, thereby ensuring that the arc block 5 is continuously subjected to force.

[0050] In a further preferred embodiment of the present invention, Figure 3-4 As shown, the top of the telescopic rod 11 can be freely extended and retracted, and a ball is formed on the top of the telescopic rod 11, which is slidably connected to the spherical slide groove 16. A circular groove for the ball to engage is opened on the inner wall of the spherical slide groove 16 at the center of the bottom end of the slider 12.

[0051] In this embodiment, when the inner ring 4 and the arc block 5 rotate, the arc block 5 drives the slider 12 to rotate through the clamping unit 13. When the slider 12 rotates, the top of the telescopic rod 11 slides along the spherical groove 16. At the same time, due to the rotation of the slider 12, the connection distance between the slider 12 and the telescopic rod 11 changes, and the telescopic rod 11 is stretched to automatically compensate for the distance difference.

[0052] A circular groove for the ball to engage is provided on the inner wall of the spherical groove 16 at the center of the bottom end of the slider 12. When the slider 12 is pushed upward at the top of the telescopic rod 11, the ball at the top will be stuck in the circular groove, ensuring that the ball at the top of the telescopic rod 11 will not slide along the spherical groove 16, ensuring that the force directions of the telescopic rod 11 and the slider 12 are consistent.

[0053] In a further preferred embodiment of the present invention, Figure 2 As shown, the outer wall of the hand-held rod 1 is divided into three types: a smooth outer wall, a threaded outer wall, and an outer wall with a limiting protrusion, and the diameters of the corresponding sections of these three outer walls are from large to small;

[0054] The inner wall of the first sliding sleeve 6 is slidably connected to the outer wall of the hand-held rod 1 with the limiting protrusion, and the threaded sleeve 7 is threadedly connected to the threaded outer wall of the hand-held rod 1 .

[0055] In this embodiment, it is ensured that when the threaded sleeve 7 rotates and moves, the first sliding sleeve 6 can only slide vertically.

[0056] It should be noted that, for the above-mentioned embodiments, for the sake of simplicity, they are all described as a series of action combinations, but those skilled in the art should know that the utility model is not limited by the described action sequence, because according to the utility model, some steps may be performed in other sequences or simultaneously. Secondly, those skilled in the art should also know that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily required by the utility model.

[0057] In the several embodiments provided in the present application, it should be understood that the disclosed devices can be implemented in other ways. For example, the device embodiments described above are merely schematic, such as the division of the above-mentioned units. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or communication connection shown or discussed can be through some interfaces, and the indirect coupling or communication connection between devices or units can be in the form of telecommunication or other forms.

[0058] The units described above as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0059] The above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit the protection scope of the utility model. Obviously, the described embodiments are only some embodiments of the utility model, rather than all embodiments. Based on these embodiments, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model. Although the utility model has been described in detail with reference to the above embodiments, ordinary technicians in this field can still combine, add, delete or make other adjustments to the features in the various embodiments of the utility model according to the circumstances without conflict, without making creative work, so as to obtain different other technical solutions that do not deviate from the concept of the utility model in essence, and these technical solutions also belong to the scope of protection of the utility model.

Claims

1. A mechanical gripper for a water gate, comprising a hand-held rod (1), an outer ring (2), a fixing pin (3), and an inner ring (4), wherein the outer wall of the outer ring (2) is fixedly connected to the top of the hand-held rod (1), two fixing pins (3) are rotatably connected to the inner walls on both sides of the top of the outer ring (2), and one end of the fixing pin (3) penetrates into the interior of the outer ring (2), and the inner ring (4) is fixedly connected between the two fixing pins (3). It is characterized in that The tops of the two inner rings (4) are rotatably connected with arc blocks (5), and the two arc blocks (5) are symmetrically distributed, and a convenient operating mechanism is provided between the hand-held rod (1) and the inner ring (4); The convenient operating mechanism includes a supporting component and a clamping component; The support assembly is used to provide support for the clamping assembly, so that the operator can use it to hold the assembly and extend the distance between the operator and the clamping assembly. The clamping assembly is used for an operator to remotely clamp and release the shroud.

2. A mechanical gripper for a water gate as claimed in claim 1, It is characterized in that The support assembly comprises a first sliding sleeve (6), a threaded sleeve (7), a second sliding sleeve (8), a fixing block (9), an L-shaped bracket (10), and a telescopic rod (11); The first sliding sleeve (6) is slidably connected to the outer wall of the hand-held rod (1), the threaded sleeve (7) is threadedly connected to the outer wall of the hand-held rod (1), and the top end of the threaded sleeve (7) is rotatably connected to the outer wall of the bottom end of the first sliding sleeve (6), and the second sliding sleeve (8) is slidably connected to the outer wall of the threaded sleeve (7); The fixed block (9) and the telescopic rod (11) are provided with two, the two fixed blocks (9) are symmetrically fixedly connected to the outer wall of the top end of the first sliding sleeve (6), the bottom ends of the two telescopic rods (11) are respectively fixedly connected to the tops of the two fixed blocks (9), and the top ends of the telescopic rods (11) pass through the outer ring (2), and the L-shaped brackets (10) are provided with two, the two L-shaped brackets (10) are symmetrically fixedly connected to the outer wall of the top end of the second sliding sleeve (8), and the top ends of the L-shaped brackets (10) pass through the fixed block (9) and the outer ring (2).

3. A mechanical gripper for a water gate as claimed in claim 2, It is characterized in that The clamping assembly comprises a slider (12), a clamping unit (13), a tooth groove (14), a gear (15), and a spherical slide groove (16); The tooth groove (14) is opened at the top of the L-shaped bracket (10), the gear (15) is fixedly connected to one end of the fixing pin (3) penetrating into the inner part of the outer ring (2), and the gear (15) is meshed with the tooth groove (14); The clamping unit (13) is arranged on the outer wall of the arc block (5), the sliding block (12) is slidably connected to the fixing pin (3), the spherical sliding groove (16) is opened on the outer wall of the bottom end of the sliding block (12), and the top end of the telescopic rod (11) is slidably connected to the spherical sliding groove (16); The clamping unit (13) comprises a concave connection block (1301), a fixed shaft (1302), and a rotating plate (1303); The concave connecting block (1301) is fixedly connected to the outer wall of the arc block (5), the fixed shaft (1302) is fixedly connected to the concave connecting block (1301), one end of the rotating plate (1303) is rotatably connected to the concave connecting block (1301), and the other end is rotatably connected to the top of the outer ring (2), and the upper and lower ends of the rotating plate (1303) are respectively tightly attached to the inner wall of the concave connecting block (1301) and the inner wall of the slider (12).

4. A mechanical gripper for a water gate as claimed in claim 3, It is characterized in that The top of the slider (12) is square and the bottom is arc-shaped, and a square groove for connecting the rotating plate (1303) is provided at the top of the slider (12).

5. A mechanical gripper for a water nozzle as claimed in claim 3, It is characterized in that The top of the telescopic rod (11) can be freely extended and retracted, and a sphere is formed on the top of the telescopic rod. The sphere is slidably connected to the spherical slide groove (16). A circular groove for the sphere to engage is provided on the inner wall of the spherical slide groove (16) at the center of the bottom end of the slider (12).

6. A mechanical gripper for a water gate as claimed in claim 2, It is characterized in that The outer wall of the hand-held rod (1) is divided into three types: a smooth outer wall, a threaded outer wall, and an outer wall with a limiting protrusion, and the corresponding sections of the three types of outer walls have diameters from large to small.

7. A mechanical gripper for a water nozzle as claimed in claim 6, It is characterized in that The inner wall of the first sliding sleeve (6) is slidably connected to the outer wall of the hand-held rod (1) with the limiting protrusion, and the threaded sleeve (7) is threadedly connected to the threaded outer wall of the hand-held rod (1).

8. A mechanical gripper for a water nozzle as claimed in claim 2, It is characterized in that The outer diameter of the lower part of the threaded sleeve (7) is larger, and the outer diameter of the upper part is smaller; the inner diameter of the threaded sleeve (7) is consistent with the outer diameter of the first sliding sleeve (6); and the inner diameter of the second sliding sleeve (8) is consistent with the outer diameter of the upper part of the threaded sleeve (7).

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