Quickly fixable ultrasonic thickness measuring device for steel pipes

Abstract

The utility model discloses a steel pipe ultrasonic thickness measuring device which can be quickly fixed, and specifically relates to the technical field of ultrasonic thickness measuring, comprising a main machine, wherein the main machine is electrically connected to a probe body, and a U-shaped disk is sleeved on the outer side of the probe body. The utility model can use a connecting mechanism to twist a rotating drum to drive a clamping block to rotate ninety degrees, and then insert one end of a fixing pin into the rotating drum, so that the clamping block is inserted into a rail groove, and the applied torque is released to make the clamping block move in the rail groove to fix the fixing pin. At the same time, when the fixing pin is installed, it will push a baffle plate to squeeze a spring, so that an opposite force acts on the fixing pin to improve the fixing effect. When disassembling, the above operation is repeated, and the fixing pin is pulled out to complete the splitting of two vertical plates. The utility model is convenient to use, can quickly fix or split the vertical plates, and is more practical. Through an adsorption component, suction can be used to generate negative air pressure, so that a soft silicone ring is adsorbed on the surface of the pipe to fix the vertical plate, and the pull rod can be pulled to limit it at the same time, which is convenient and trouble-free to use.

Description

Technical Field

[0001] The utility model relates to the technical field of ultrasonic thickness measurement, in particular to a steel pipe ultrasonic thickness measurement device which can be quickly fixed. Background Art

[0002] Seamless steel pipes are common steel and metallurgical metal products. In order to ensure the processing quality of seamless steel pipes, flaw detection is required after the corresponding deformation processing process. Therefore, non-destructive testing is the main quality inspection process in the production of seamless steel pipes. Compared with welded pipes, seamless steel pipes are generally used in places with higher pressure, more important uses, and harsh operating conditions, so more projects require non-destructive testing. Most of the seamless steel pipes for conventional purposes are tested for ultrasonic longitudinal defects. For high-end seamless steel pipes such as 690 alloy pipes, nickel-based alloy oil well pipes, austenitic stainless alloy seamless steel pipes, etc., which have strict requirements on bearing pressure and operating conditions, in addition to non-destructive testing of ultrasonic longitudinal defects, other parameters such as wall thickness must also be tested in various forms of non-destructive testing.

[0003] The patent with publication number CN111521137B discloses an ultrasonic thickness measuring device for stainless steel pipes with a probe, which belongs to the technical field of ultrasonic thickness measuring. The ultrasonic thickness measuring device for stainless steel pipes with a probe comprises a main unit, a probe body and a wire. The main unit and the probe body are electrically connected through the wire. The outer end of the probe body is slidably connected to a limiting sleeve and a U-shaped disk. The present invention stably adsorbs on the surface of the pipe through a vacuum adsorption plate, and at the same time cooperates with a pair of elastic reels and cloth belts to automatically adjust under the action of elastic force, so that the probe body automatically maintains the verticality between the outer wall of the pipe and the stability of its own position, thereby realizing the precise positioning measurement of the pipe by the probe body, and continuously provides a sufficient amount of coupling agent for the gap between the probe body and the pipe through a liquid reservoir, so that the probe body and the pipe maintain a good seamless coupling state even when in line contact, further ensuring the accuracy of the measurement.

[0004] During use of the ultrasonic thickness measuring device for steel pipes, the two vertical plates are connected and fixed by bolts. This method is complicated to operate, inconvenient to use, and relatively poor in practicality. Utility Model Content

[0005] The utility model aims to provide a steel pipe ultrasonic thickness measuring device which can be quickly fixed, so as to solve the problems raised in the above-mentioned background technology.

[0006] In order to solve the above technical problems, the utility model provides the following technical solutions: a steel pipe ultrasonic thickness measuring device that can be quickly fixed, comprising a main unit, the main unit is electrically connected to a probe body, a U-shaped disk is sleeved on the outside of the probe body, both sides of the U-shaped disk are connected to cloth belts through elastic reels, the lower end of the cloth belt is connected to a vertical plate, the top of the U-shaped disk is threadedly connected to a liquid reservoir, and the liquid reservoir is sleeved on the outside of the lower end of the probe body, rollers are rotatably installed at symmetrical positions on the bottom of the U-shaped disk, the two vertical plates are connected by a connecting mechanism, and an adsorption component is arranged inside the vertical plate. The connecting mechanism includes a symmetrically arranged fixing pin, and one end of the fixing pin passes through the two vertical plates, and a fixing cylinder is symmetrically arranged on the side wall of the vertical plate on one side, and the fixing cylinder is sleeved on the outside of the fixing pin, and a rotating cylinder is arranged on the inner side of the fixing pin and the outer side of the fixing cylinder, and two limit plates are sleeved on the outer wall of the rotating cylinder distributed on the left and right sides, and an annular groove matching the limit plate is opened on the inner wall of the fixing cylinder, and a torsion spring is sleeved on the outer side of the rotating cylinder between the two limit plates, and the two ends of the torsion spring are respectively fixedly connected to the limit plate and the fixing cylinder on one side, and the inner wall of the rotating cylinder is symmetrically provided with clamping blocks, and the outer wall of the fixing pin is symmetrically provided with rail grooves matching the clamping blocks.

[0007] Furthermore, the connecting mechanism also includes a baffle, and the baffle is arranged on one side of the fixed pin in the rotating drum, the outer wall of the baffle is symmetrically provided with a slider, and the inner wall of the rotating drum is symmetrically provided with a sliding groove adapted to the slider, and a rolling ball is embedded and installed at one end of the fixed pin close to the baffle, and a spring is provided in the rotating drum on the side of the baffle away from the fixed pin. Through the connecting mechanism, the two vertical plates can be conveniently and quickly connected, fixed or split. It is easy to use and the probe body can be quickly fixed to the outside of the steel pipe whose thickness needs to be measured. It is convenient to operate, has higher work efficiency and is more practical.

[0008] Furthermore, the adsorption component includes a soft silicone ring, and the soft silicone ring is arranged on the top of the vertical plate, an inner groove is provided on the inner side of the soft silicone ring on the top of the vertical plate, a plurality of air storage tanks are provided at the bottom of the inner groove, an inner cavity connected to the plurality of air storage tanks is provided in the vertical plate, a sealing column is provided in the air storage tank, the lower end of the sealing column is connected to a bottom plate in the inner cavity, a pull rod is connected to the bottom of the bottom plate, and a handle is connected to the lower end of the pull rod under the vertical plate, a spring 2 is sleeved on the outer side of the pull rod under the bottom plate, a chamber is provided on one side below the inner cavity of the vertical plate, a block is provided in the chamber, and one end of the block is connected to A limit rod is connected, and the limit rod is inserted into a limit groove opened on the side wall of the pull rod, and there are several limit grooves. A spring three is sleeved on the outer side of the limit rod on one side of the block. The bottom of the block is connected with a support rod, and the lower end of the support rod is connected to a pull ring outside the vertical plate. An adjustment groove adapted to the support rod is opened at the bottom of the vertical plate, and the adjustment groove is connected to the chamber. Through the adsorption component, the pull rod can be pulled to realize the gas in the inner groove being drawn into the gas storage tank, thereby generating negative air pressure, so that the soft silicone ring is tightly adsorbed and fixed on the surface of the pipe, so that the vertical plate is fixed on the surface of the pipe, and at the same time, it is convenient to limit and fix the pull rod after pulling, which is more convenient to use.

[0009] Furthermore, the limit plate is annular and fixedly connected to the drum, the rail grooves are distributed in a circumferentially equidistant array, and are L-shaped to limit the drum, and the rail grooves can guide and restrict the block.

[0010] Furthermore, the rolling ball can rotate relative to the fixing pin, and one end of the spring is fixedly connected to the baffle and the inner wall of the drum respectively to avoid large friction between the fixing pin and the baffle, thereby affecting the resetting rotation of the drum under the torsion force of the torsion spring.

[0011] Furthermore, the cross-section of the limit groove is a right-angled trapezoid, one end of the limit rod is adapted to the limit groove, and a sealing ring is provided on the outer wall of the bottom plate so that the limit groove and the inclined surface of one end of the pull rod can cooperate so that when the pull rod is pulled, the limit rod can be squeezed and pushed out.

[0012] Compared with the prior art, the beneficial effects achieved by the utility model are:

[0013] The utility model can use the connecting mechanism to twist one end of the rotating drum to drive the rotating drum to rotate, and then drive the clamping block to rotate 90 degrees, insert one end of the fixing pin into the rotating drum, and insert the clamping block into the track groove on the fixing pin, and then release the torsion force on the rotating drum, so that it can reset and rotate under the torsion force of the torsion spring, drive the clamping block to move in the track groove to achieve the restriction and fixation of the fixing pin, and at the same time, the installation of the fixing pin will push the baffle to squeeze the spring, generate an opposite force to act on the fixing pin, further limit it, and improve the fixing effect. When disassembling, repeat the above operation on the rotating drum, and finally pull out the fixing pin to complete the splitting between the two vertical plates. It is easy to use, can quickly connect, fix or split the vertical plates, and is more practical.

[0014] The utility model can suck the air in the inner groove to generate negative air pressure through the adsorption component, so that the soft silicone ring is adsorbed on the surface of the pipe, and the vertical plate is fixed on the surface of the pipe. At the same time, the pull rod can be pulled to limit it at the same time, and when the vertical plate is disassembled, the bottom plate and the sealing column can be reset by the elastic force of the spring, which is convenient and trouble-free to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0016] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0017] Figure 2 It is a schematic diagram of the local structure between the vertical plate, the sealing column and the tie rod of the utility model;

[0018] Figure 3 It is a schematic diagram of the structure between the fixing pin and the fixing cylinder of the utility model;

[0019] Figure 4 It is a schematic diagram of the local structure between the fixed pin and the rotating drum of the utility model;

[0020] Figure 5 This utility model Figure 2 A is a schematic diagram of the enlarged structure of the middle part;

[0021] In the figure: 1. host; 2. U-shaped plate; 3. probe body; 4. cloth belt; 5. vertical plate; 6. soft silicone ring; 7. fixing pin; 8. fixing cylinder; 9. rotating cylinder; 10. limit plate; 11. torsion spring; 12. block; 13. rail groove; 14. rolling ball; 15. baffle; 16. slider; 17. spring one; 18. inner groove; 19. air storage tank; 20. inner cavity; 21. sealing column; 22. bottom plate; 23. pull rod; 24. spring two; 25. limit rod; 26. block; 27. spring three; 28. support rod. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0023] like Figure 1 - Figure 5The steel pipe ultrasonic thickness measuring device shown in the figure, which can be quickly fixed, includes a main unit 1, which is electrically connected to a probe body 3, a U-shaped disc 2 is sleeved on the outer side of the probe body 3, both sides of the U-shaped disc 2 are connected to cloth belts 4 through elastic reels, and the lower end of the cloth belt 4 is connected to a vertical plate 5, the top of the U-shaped disc 2 is threadedly connected to a liquid reservoir, and the liquid reservoir is sleeved on the outer side of the lower end of the probe body 3, rollers are rotatably installed at symmetrical positions on the bottom of the U-shaped disc 2, the two vertical plates 5 are connected by a connecting mechanism, an adsorption component is arranged inside the vertical plate 5, and the connecting mechanism includes symmetrically arranged fixing pins 7, and the fixing pins 7 One end passes through two vertical plates 5, and a fixed cylinder 8 is symmetrically provided on the side wall of the vertical plate 5 on one side, and the fixed cylinder 8 is sleeved on the outside of the fixed pin 7. A rotating cylinder 9 is provided on the inner side of the fixed pin 7 and the outer side of the fixed cylinder 8. Two limit plates 10 are sleeved on the left and right outer walls of the rotating cylinder 9. An annular groove matching the limit plates 10 is provided on the inner wall of the fixed cylinder 8. A torsion spring 11 is sleeved between the two limit plates 10 on the outer side of the rotating cylinder 9, and the two ends of the torsion spring 11 are fixedly connected to the limit plates 10 on one side and the fixed cylinder 8 respectively. Blocks 12 are symmetrically provided on the inner wall of the rotating cylinder 9, and rail grooves 13 matching the block 12 are symmetrically provided on the outer wall of the fixed pin 7.

[0024] In this example, the connecting mechanism also includes a baffle 15, and the baffle 15 is arranged on one side of the fixed pin 7 in the rotating drum 9. The outer wall of the baffle 15 is symmetrically provided with a slider 16, and the inner wall of the rotating drum 9 is symmetrically provided with a slide groove adapted to the slider 16. A rolling ball 14 is embedded and installed at one end of the fixed pin 7 close to the baffle 15, and a spring 17 is provided in the rotating drum 9 on the side of the baffle 15 away from the fixed pin 7. Through the connecting mechanism, the two vertical plates 5 can be conveniently and quickly connected, fixed or split. It is easy to use and can quickly fix the probe body 3 on the outside of the steel pipe whose thickness needs to be measured, which is convenient to operate, has higher work efficiency and is more practical. In this example, the adsorption component includes a soft silicone ring 6, and the soft silicone ring 6 is arranged on the top of the vertical plate 5. An inner groove 18 is opened inside the soft silicone ring 6 at the top of the vertical plate 5. A plurality of air storage grooves 19 are opened at the bottom of the inner groove 18. An inner cavity 20 connected to the plurality of air storage grooves 19 is opened in the vertical plate 5. A sealing column 21 is arranged in the air storage groove 19. The lower end of the sealing column 21 is connected to a bottom plate 22 in the inner cavity 20. A pull rod 23 is connected to the bottom of the bottom plate 22, and the lower end of the pull rod 23 is connected to a handle below the vertical plate 5. A spring 24 is sleeved on the outer side of the pull rod 23 below the bottom plate 22. A chamber is opened on one side below the inner cavity 20 of the vertical plate 5, and a stopper 26 is arranged in the chamber. One end of the stopper 26 is connected to the bottom plate 22. A limiting rod 25 is connected, and the limiting rod 25 is inserted into the limiting groove opened on the side wall of the pull rod 23, and there are several limiting grooves. A spring three 27 is sleeved on one side of the block 26 on the outer side of the limiting rod 25, and a support rod 28 is connected to the bottom of the block 26, and the lower end of the support rod 28 is connected to a pull ring outside the vertical plate 5. An adjustment groove adapted to the support rod 28 is opened at the bottom of the vertical plate 5, and the adjustment groove is connected to the chamber. Through the adsorption component, the pull rod 23 can be pulled and pulled to realize the gas in the inner groove 18 is drawn into the gas storage tank 19, thereby generating negative air pressure, so that the soft silicone ring 6 is tightly adsorbed and fixed on the surface of the pipe, so that the vertical plate 5 is fixed on the surface of the pipe, and at the same time, it is convenient to limit and fix the pull rod 23 after pulling, which is more convenient to use. In this example, the limit plate 10 is annular and fixedly connected to the drum 9. The track grooves 13 are distributed in an array equidistantly around the circumference and are L-shaped so as to limit the drum 9. The track grooves 13 can guide and restrict the block 12. In this example, the ball 14 can rotate relative to the fixed pin 7. The two ends of the spring 17 are fixedly connected to the baffle 15 and the inner wall of the drum 9 respectively to avoid large friction between the fixed pin 7 and the baffle 15, thereby affecting the return rotation of the drum 9 under the torsion of the torsion spring 11. In this example, the cross-section of the limit groove is a right-angled trapezoid, one end of the limit rod 25 is adapted to the limit groove, and a sealing ring is sleeved on the outer wall of the bottom plate 22 so as to utilize the limit groove and the inclined surface of one end of the pull rod 23 to cooperate so that when the pull rod 23 is pulled, the limit rod 25 can be squeezed and pushed out.

[0025] The working principle of the utility model is as follows: when in use, after the U-shaped disk 2 and the probe body 3 are placed at appropriate positions on the surface of the pipe, the cloth tape 4 is wrapped around the pipe to connect to the vertical plate 5, and one end of the rotating drum 9 is twisted to drive the limit plate 10 and the block 12 to rotate synchronously. At the same time, the limit plate 10 will twist the torsion spring 11. Until the block 12 is rotated to a ninety-degree position, one end of the fixing pin 7 is passed through the corresponding installation position on the two vertical plates 5, and one end of the fixing pin 7 is inserted into the rotating drum 9, and at the same time, the block 12 enters the rail groove 13, and then the torsion force applied to the rotating drum 9 is released, so that the limit plate 10 drives the rotating drum 9 to reset and rotate under the torsion of the torsion spring 11, so that the rotating drum 9 drives the block 12 to move in the rail groove 13, so as to achieve the fixed The connection of the pin 7 is fixed, and when the fixing pin 7 is inserted into the rotating drum 9, the rolling ball 14 at one end of the fixing pin 7 will push the baffle 15 to drive the slider 16 to slide along the slide groove. At the same time, the baffle 15 will squeeze the spring 17, so that the elastic force generated by the deformation of the spring 17 acts on the fixing pin 7, so that the inner wall of the track groove 13 and the block 12 are prevented from being tightly fitted, thereby improving the limiting effect of the fixing pin 7, and the connection and fixation between the two vertical plates 5 can be completed. When splitting, the above steps can be repeated to move the block 12 to the position corresponding to the opening of the track groove 13. The baffle 15 will push the fixing pin 7 out of the rotating drum 9 under the elastic force of the spring 17, which plays a role in assisting the fixing pin 7 to move out, making it convenient to take out the fixing pin 7, and the two vertical plates 5 can be connected. The splitting between them makes it convenient and quick to connect, fix and split the vertical plate 5, and at the same time, it is convenient to fix the probe body 3 on the surface of the pipe, which improves work efficiency and is more practical; the soft silicone ring 6 on the vertical plate 5 is fitted with the surface of the pipe, and then the lower end of the pull rod 23 is pulled down, so that the pull rod 23 drives the bottom plate 22 and the sealing column 21 to move downward, thereby drawing the air in the inner groove 18 into the air storage tank 19, so that negative air pressure is generated in the inner groove 18, so that the soft silicone ring 6 is tightly adsorbed and fixed on the surface of the pipe, and at the same time, when the bottom plate 22 moves downward, it will squeeze the spring 24, and the inclined surface in the limit groove on the pull rod 23 will squeeze and push one end of the limit rod 25 to move into the chamber, and at the same time, the limit rod 25 will push the stopper 26 to pull the handle spring 3 2 7, and the stopper 26 will drive the support rod 28 to move synchronously until one end of the limit rod 25 inserted into the limit groove moves out. When the limit groove of the squeezed limit rod 25 is misaligned with the limit rod 25, the stopper 26 will drive the limit rod 25 to reset under the elastic force of the spring three 27, so that one end of the limit rod 25 is inserted into the corresponding limit groove again. If the pull rod 23 is continued to be pulled, the above steps are repeated until the pull rod 23 is pulled to a suitable position, so that the vertical plate 5 can be fixed on the surface of the pipe, and the position of the pull rod 23 can be adjusted and stopped at the same time, which is convenient for its limit fixation and more convenient to use. In the process of disassembling the vertical plate 5 afterwards, the bottom plate 22 and the sealing column 21 will also reset under the elastic force of the spring two 24, which is convenient to use and has strong practicality.

[0026] Finally, it should be noted that the above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. Although the utility model is described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions recorded in the above embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A steel pipe ultrasonic thickness measuring device that can be quickly fixed, comprising a main unit (1), the main unit (1) being electrically connected to a probe body (3), the probe body (3) being sleeved with a U-shaped disc (2) on the outside, both sides of the U-shaped disc (2) being connected to cloth belts (4) via elastic reels, the lower end of the cloth belts (4) being connected to vertical plates (5), the top of the U-shaped disc (2) being threadedly connected to a liquid reservoir, and the liquid reservoir being sleeved on the outer side of the lower end of the probe body (3), rollers being rotatably mounted at symmetrical positions on the bottom of the U-shaped disc (2), characterized in that: The two vertical plates (5) are connected by a connecting mechanism. An adsorption assembly is provided inside the vertical plate (5). The connecting mechanism includes a symmetrically arranged fixing pin (7), and one end of the fixing pin (7) penetrates through the two vertical plates (5). A fixing cylinder (8) is symmetrically provided on the side wall of one side of the vertical plate (5), and the fixing cylinder (8) is sleeved outside the fixing pin (7). A rotating cylinder (9) is provided on the inner side of the fixing pin (7) and outside the fixing cylinder (8). Two limit plates (10) are sleeved on the outer wall of the rotating cylinder (9) and are distributed on the left and right sides. An annular groove matching the limit plates (10) is provided on the inner wall of the fixing cylinder (8). A torsion spring (11) is sleeved between the two limit plates (10) on the outer side of the rotating cylinder (9), and two ends of the torsion spring (11) are fixedly connected to the limit plate (10) on one side and the fixing cylinder (8) respectively. A clamping block (12) is symmetrically provided on the inner wall of the rotating cylinder (9), and a rail groove (13) matching the clamping block (12) is symmetrically provided on the outer wall of the fixing pin (7).

2. The quick-fixable ultrasonic thickness measuring device for steel pipes according to claim 1 is characterized in that: The connecting mechanism further comprises a baffle (15), and the baffle (15) is arranged on one side of the fixing pin (7) in the rotating drum (9), the outer wall of the baffle (15) is symmetrically provided with a sliding block (16), the inner wall of the rotating drum (9) is symmetrically provided with a sliding groove adapted to the sliding block (16), a rolling ball (14) is embedded and installed at one end of the fixing pin (7) close to the baffle (15), and a spring (17) is provided in the rotating drum (9) on the side of the baffle (15) away from the fixing pin (7).

3. The quick-fixable ultrasonic thickness measuring device for steel pipes according to claim 1 is characterized in that: The adsorption component comprises a soft silicone ring (6), and the soft silicone ring (6) is arranged on the top of the vertical plate (5), an inner groove (18) is provided inside the soft silicone ring (6) at the top of the vertical plate (5), a plurality of air storage grooves (19) are provided at the bottom of the inner groove (18), an inner cavity (20) connected to the plurality of air storage grooves (19) is provided inside the vertical plate (5), a sealing column (21) is provided inside the air storage groove (19), the lower end of the sealing column (21) is connected to a bottom plate (22) in the inner cavity (20), a pull rod (23) is connected to the bottom of the bottom plate (22), and the lower end of the pull rod (23) is connected to a handle below the vertical plate (5), and the outer side of the pull rod (23) is connected to the bottom A spring 2 (24) is sleeved under the plate (22); a chamber is provided on one side below the inner cavity (20) of the vertical plate (5); a stopper (26) is provided in the chamber; one end of the stopper (26) is connected to a limit rod (25); the limit rod (25) is inserted into a limit groove provided on the side wall of the pull rod (23); a plurality of limit grooves are provided; a spring 3 (27) is sleeved on one side of the stopper (26) on the outer side of the limit rod (25); a support rod (28) is connected to the bottom of the stopper (26); the lower end of the support rod (28) is connected to a pull ring outside the vertical plate (5); an adjustment groove adapted to the support rod (28) is provided at the bottom of the vertical plate (5); and the adjustment groove is communicated with the chamber.

4. The quick-fixable ultrasonic thickness measuring device for steel pipes according to claim 2 is characterized in that: The limiting plate (10) is annular, and the limiting plate (10) is fixedly connected to the rotating drum (9); the rail grooves (13) are arranged in a circumferentially equidistant array, and the rail grooves (13) are L-shaped.

5. The quick-fixable ultrasonic thickness measuring device for steel pipes according to claim 2 is characterized in that: The rolling ball (14) can rotate relative to the fixing pin (7), and the two ends of the spring (17) are fixedly connected to the baffle (15) and the inner wall of the rotating drum (9) respectively.

6. The quick-fixable ultrasonic thickness measuring device for steel pipes according to claim 3 is characterized in that: The cross section of the limiting groove is a right-angled trapezoid, one end of the limiting rod (25) is matched with the limiting groove, and the outer wall of the bottom plate (22) is sleeved with a sealing ring.

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