Hydraulic cylinder rust prevention device

Abstract

The utility model discloses a hydraulic cylinder rust prevention device in the technical field of hydraulic cylinders, which comprises a cylinder body and a plugging device, the outer wall of the cylinder body is provided with a through hole communicated with an inner cavity, the plugging device is used for plugging the through hole, and the plugging device comprises a plugging shell, a driving mechanism, a transmission rod and a locking rod, the driving mechanism comprises a rotating shaft and a driving rod, the rotating shaft is rotationally connected to the plugging shell, one end of the rotating shaft is fixedly installed on the side face of the center of the driving rod, the rotating shaft is used for driving the center of the driving rod to rotate, and the two transmission rods are rotationally connected to the two ends of the driving rod correspondingly; the free ends of the two transmission rods are rotationally connected with the two locking rods correspondingly, the two locking rods are connected to the side wall of the plugging shell in a sliding mode, the free ends of the locking rods extend out of the plugging shell, the free ends of the locking rods are inserted into the locking holes, the plugging shell is fixed into the through hole, the locking holes are formed in the side wall of the through hole, and the locking rods are inserted into the locking holes. A fixing mechanism used for fixing the driving rod is further arranged in the plugging shell.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulic cylinders, and particularly relates to an anti-rust device for hydraulic cylinders. Background Technique

[0002] With the continuous development of society and the continuous progress of industry, a hydraulic cylinder is one of the hydraulic components that convert hydraulic energy into mechanical energy and perform reciprocating motion, and has a wide range of uses in industry. The working force of the heavy-duty hydraulic cylinder in the hydraulic cylinder is relatively strong, and it has excellent performance in some heavy industries.

[0003] The existing Chinese patent with the publication number CN201921944662.9 discloses a gas-phase rust-proof plugging device for a hydraulic cylinder, which adopts the technical scheme of "including a plugging cap (2), a plugging body (3), a gas-phase rust-proof bag (4) and a filter screen (7), the plugging cap (2) and the plugging body (3) are integrally formed into a T shape, the plugging cap (2) and the plugging body (3) are fixedly connected in a non-detachable manner, the filter screen (7) is located inside the plugging body (3), the gas-phase rust-proof bag (4) is located inside the plugging body (3), and the plugging device (9) is plugged at the orifice of the hydraulic cylinder oil hole (5)", achieving the effect of "the structure of the utility model is simple, and by using the utility model to plug at the orifice of the hydraulic cylinder oil hole, the problem of internal rusting of the hydraulic cylinder during the transportation and storage of the hydraulic cylinder is solved".

[0004] However, the method of plugging the plugging device at the orifice of the hydraulic cylinder oil hole is not specifically described. Generally, it is considered to be a clamping method. Although this method is simple to insert, it is troublesome to disassemble, and the plugging device and the orifice of the hydraulic cylinder oil hole are mutually extruded, which may cause damage to the hydraulic cylinder. Content of the Utility Model

[0005] The purpose of the utility model is to provide an anti-rust device for a hydraulic cylinder to solve the problem that the method of plugging the plugging device at the orifice of the hydraulic cylinder oil hole is not specifically described. Generally, it is considered to be a clamping method. Although this method is simple to insert, it is troublesome to disassemble, and the plugging device and the orifice of the hydraulic cylinder oil hole are mutually extruded, which may cause damage to the hydraulic cylinder.

[0006] To achieve the above purpose, the utility model provides the following technical scheme:

[0007] A rust-proof device for a hydraulic cylinder, comprising a cylinder body and a plugging device. A through hole communicating with the inner cavity is formed in the outer wall of the cylinder body. The plugging device is used to plug the through hole and includes a plugging shell, a driving mechanism, a transmission rod and a locking rod located in the plugging shell. The driving mechanism includes a rotating shaft and a driving rod. The rotating shaft is rotatably connected to the plugging shell, and one end is fixedly installed on the central side surface of the driving rod. The rotating shaft is used to drive the central rotation of the driving rod. There are two transmission rods, which are respectively rotatably connected to both ends of the driving rod. The free ends of the two transmission rods are respectively rotatably connected to the two locking rods. The two locking rods are slidably connected to the side wall of the plugging shell, and the free ends extend out of the plugging shell. The free ends of the locking rods are inserted into the locking holes to fix the plugging shell in the through hole. The locking holes are formed in the side wall of the through hole. A fixing mechanism for fixing the driving rod is further provided in the plugging shell.

[0008] As a further solution of the utility model: the rotation plane of the driving rod is perpendicular to the rotating shaft. The rotating shaft is rotatably connected to the top end of the plugging shell through a bearing. The driving rod drives the two transmission rods to rotate synchronously. The two transmission rods drive the two locking rods to slide synchronously and insert into the locking holes. The locking holes correspond to and match the free ends of the locking rods.

[0009] As a further solution of the utility model: a receiving cavity is formed in the plugging shell. The driving mechanism, the transmission rod and the locking rod are all located in the receiving cavity. Two through holes communicating with the receiving cavity are formed in the side wall of the plugging shell. The cross section of the two locking rods matches and is slidably connected to the through holes. The free end of the rotating shaft is fixedly connected to a turntable.

[0010] As a further solution of the utility model: the fixing mechanism includes a clamping shaft and a fixing shaft located in the receiving cavity. The fixing shaft is located below the clamping shaft and has a diameter larger than that of the clamping shaft. After the locking rod is completely inserted into the locking hole, the driving rod and the two transmission rods are in a straight line. Entrance grooves are formed on both sides of the driving rod. The two entrance grooves are located on both sides of the rotating shaft and have opposite opening directions. Fixing grooves are formed at the ends of the two entrance grooves.

[0011] As a further solution of the utility model: the width of the entrance groove is larger than that of the clamping shaft. The fixing groove matches the clamping shaft. The clamping shaft and the entrance groove and the fixing groove are at the same height. During the process that the driving rod rotates to be in a straight line with the transmission rod, the clamping shaft passes through the entrance groove and enters the fixing groove. The clamping shaft slides along the fixing groove to fix the position of the driving rod.

[0012] As a further solution of the utility model: a connecting shaft is fixedly connected to the top end of the clamping shaft, a moving block is fixedly connected to the top end of the connecting shaft, a screw rod is threadedly connected to the top end of the moving block, and the free end of the screw rod extends out of the sealing shell and is fixedly connected to a handle.

[0013] As a further solution of the utility model: a first sliding groove, a second sliding groove and a third sliding groove are formed in the top end of the sealing shell, the connecting shaft, the moving block and the screw rod slide along the first sliding groove, the second sliding groove and the third sliding groove respectively, the width of the second sliding groove is greater than that of the first sliding groove, and the width of the moving block is greater than the diameter of the connecting shaft.

[0014] As a further solution of the utility model: a filter screen is clamped inside the lower end of the side wall of the accommodating cavity, a vapor phase rust inhibitor bag is arranged above the filter screen, the vapor phase rust inhibitor bag is fixedly installed on the side wall of the accommodating cavity through a hanging device, the driving mechanism and the vapor phase rust inhibitor bag are separated by a partition plate, and the partition plate is clamped on the side wall of the accommodating cavity.

[0015] Compared with the prior art, the beneficial effects of the utility model are as follows:

[0016] In the utility model, the sealing device can be sealed on the through hole. Due to long-term storage inside the cylinder block, a small amount of water inside will undergo an oxidation reaction with air and rust. The sealing device can prevent the entry of air and water; the corrosion inhibitor gas continuously and slowly volatilized from the vapor phase rust inhibitor bag in the accommodating cavity enters the cylinder block to prevent the inside of the cylinder block from rusting; the hanging device can play a role in fixing the vapor phase rust inhibitor bag; the filter screen can prevent the vapor phase rust inhibitor from mixing into the cylinder block while allowing the corrosion inhibitor gas released by the vapor phase rust inhibitor bag to circulate. The above structures can solve the problem of internal rusting during the transportation and storage of the hydraulic cylinder.

[0017] In the utility model, the turntable drives the rotating shaft to rotate, the rotating shaft drives the driving rod to rotate around the rotating shaft, the driving rod drives the transmission rods at both ends to move synchronously, and the two transmission rods drive the two locking rods to slide synchronously along the through holes and insert into the corresponding locking holes to fix the sealing shell into the through hole. The above process is convenient and fast, and the purpose of fixing the sealing shell into the through hole can be achieved without a complex structure, and the hydraulic cylinder will not be damaged.

[0018] In the utility model, the fixed shaft can hold the bottom surface of the driving rod to limit the position of the driving rod; after the clamping shaft enters the fixed groove, it slides along the fixed groove and reaches the side of the fixed groove far from the entry groove to stably fix the position of the driving rod. The above process is convenient and fast, and the position of the driving rod can be fixed without a complex structure. Description of the Drawings

[0019] Figure 1 is a three-dimensional structural schematic diagram of the utility model;

[0020] Figure 2 Schematic installation structure diagram of the plugging device in the present utility model;

[0021] Figure 3 Schematic three-dimensional structure diagram of the plugging device in the present utility model;

[0022] Figure 4 Schematic internal structure diagram of the plugging device in the present utility model;

[0023] Figure 5 is Figure 4 the enlarged view of part A in

[0024] Figure 6 Schematic three-dimensional structure diagram of the fixing mechanism in the present utility model;

[0025] Figure 7 Schematic internal structure diagram of the plugging device in the non-working state of the present utility model;

[0026] Figure 8 is Figure 7 the enlarged view of part B in

[0027] Figure 9 Schematic internal structure diagram of the plugging device in the working state of the present utility model.

[0028] In the figure: 1. cylinder block; 11. through hole; 12. locking hole; 2. plugging shell; 21. accommodating cavity; 22. perforation; 23. partition plate; 24. first chute; 25. second chute; 26. third chute; 3. driving mechanism; 31. rotating shaft; 32. driving rod; 33. entering groove; 34. fixing groove; 35. turntable; 4. transmission rod; 5. locking rod; 6. fixing mechanism; 61. moving block; 62. connecting shaft; 63. clamping shaft; 64. fixing shaft; 65. screw; 66. handle; 7. vapor phase rust preventive bag; 8. hanging device; 9. filter screen. Specific embodiments

[0029] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0030] This embodiment;

[0031] A rust prevention device for a hydraulic cylinder, as Figures 1-9As shown in the figure, it includes a cylinder block 1 and a plugging device. A through hole 11 communicating with the inner cavity is provided on the outer wall of the cylinder block 1. The plugging device is used to plug the through hole 11 and includes a plugging shell 2. An accommodation cavity 21 is provided in the plugging shell 2. A filter screen 9 is snap-fitted inside the lower end of the side wall of the accommodation cavity 21. An air-phase rust preventive bag 7 is provided above the filter screen 9. The air-phase rust preventive bag 7 is fixedly installed on the side wall of the accommodation cavity 21 through a hanging device 8. With such a setting, the plugging device can be plugged on the through hole 11. Since the cylinder block 1 is stored for a long time, a small amount of water inside will undergo an oxidation reaction with the air and rust. The plugging device can prevent the entry of air and water; the air-phase rust preventive bag 7 in the accommodation cavity 21 will continuously and slowly volatilize the corrosion inhibitor gas into the cylinder block 1 to prevent the inside of the cylinder block 1 from rusting; the hanging device 8 can play a role in fixing the air-phase rust preventive bag 7; while the filter screen 9 allows the corrosion inhibitor gas released by the air-phase rust preventive bag 7 to flow through, it can prevent the air-phase rust preventive agent from mixing into the cylinder block 1. The above structure can solve the problem of internal rust during the transportation and storage of the hydraulic cylinder.

[0032] In this embodiment: A driving mechanism 3 is provided in the plugging shell 2. The driving mechanism 3 is located in the accommodation cavity 21. The driving mechanism 3 includes a rotating shaft 31 and a driving rod 32. The rotating shaft 31 is rotatably connected to the top shell of the plugging shell 2 through a bearing, one end extends into the accommodation cavity 21 and is fixedly installed on the central side surface of the driving rod 32, and the other end is fixedly connected to a turntable 35. The turntable 35 drives the rotating shaft 31 to rotate to drive the driving rod 32 to rotate around the rotating shaft 31. The rotation plane of the driving rod 32 is perpendicular to the rotating shaft 31.

[0033] In this embodiment: Two transmission rods 4 are provided in the plugging shell 2, and are respectively rotatably connected to both ends of the driving rod 32. The free ends of the two transmission rods 4 can rotate synchronously with the driving rod 32, and the rotation directions are opposite.

[0034] In this embodiment: Two locking rods 5 are provided in the plugging shell 2. The free ends of the two transmission rods 4 are respectively rotatably connected to the two locking rods 5. The two locking rods 5 are slidably connected to the side wall of the plugging shell 2. The driving rod 32 drives the two locking rods 5 to slide synchronously through the two transmission rods 4 without the problem of sequence.

[0035] In this embodiment: Two through holes 22 communicating with the accommodation cavity 21 are provided on the side wall of the plugging shell 2. The cross-section of the two locking rods 5 is in interference fit with the through holes 22 and is slidably connected, and the free ends extend out of the plugging shell 2. The through holes 22 can facilitate the free sliding of the two locking rods 5 on the side wall of the plugging shell 2.

[0036] In this embodiment: The free end of the locking rod 5 is inserted into the locking hole 12, fixing the plugging shell 2 into the through hole 11. The locking hole 12 is opened on the side wall of the through hole 11. After the plugging shell 2 is inserted into the through hole 11, the perforation 22 corresponds to the locking hole 12. By setting sliders and sliding grooves on the contact surface between the plugging shell 2 and the side wall of the through hole 11, it can be ensured that after the plugging shell 2 is inserted into the through hole 11, the perforation 22 exactly corresponds to the locking hole 12.

[0037] In this embodiment: Driven by the transmission rod 4, the two locking rods 5 are inserted into the locking holes 12, fixing the plugging shell 2 into the through hole 11; the locking holes 12 correspond to and match the free ends of the locking rods 5.

[0038] The above process is convenient and fast, and the purpose of fixing the plugging shell 2 into the through hole 11 can be achieved without a complex structure, and it will not damage the hydraulic cylinder.

[0039] The process of the driving mechanism 3 driving the transmission rod 4 and the locking rod 5 is as follows:

[0040] First, insert the plugging shell 2 into the through hole 11. After insertion, ensure that the perforation 22 corresponds to the locking hole 12. Then, rotate the turntable 35. The turntable 35 drives the rotating shaft 31 to rotate. The rotating shaft 31 drives the driving rod 32 to rotate around the rotating shaft 31. The driving rod 32 drives the two transmission rods 4 at both ends to move synchronously. The two transmission rods 4 drive the two locking rods 5 to slide synchronously along the perforation 22 and insert into the corresponding locking holes 12, fixing the plugging shell 2 into the through hole 11. At this time, the driving rod 32, the two transmission rods 4 and the locking rods 5 are in a straight line.

[0041] In this embodiment: The driving mechanism 3 and the vapor-phase rust preventive bag 7 are separated by a partition plate 23. The partition plate 23 is clamped on the side wall of the accommodating cavity 21 to prevent the vapor-phase rust preventive agent from entering the driving mechanism 3, the transmission rod 4 and the locking rod 5.

[0042] In this embodiment: Although the driving rod 32, the two transmission rods 4 and the locking rods 5 are in a straight line and the driving rod 32 can provide a large supporting force to the two transmission rods 4 and the locking rods 5, once the driving rod 32 rotates, the supporting force disappears instantly. Therefore, it is necessary to fix the driving rod 32.

[0043] In this implementation: A fixing mechanism 6 for fixing the driving rod 32 is further provided inside the plugging shell 2. The fixing mechanism 6 includes a clamping shaft 63 and a fixing shaft 64 located inside the accommodating cavity 21. The fixing shaft 64 is located below the clamping shaft 63. After the locking rod 5 is completely inserted into the locking hole 12, the driving rod 32 and the two transmission rods 4 are in a straight line. Entrance grooves 33 are formed on both sides of the driving rod 32. The two entrance grooves 33 are located on both sides of the rotating shaft 31, and the opening directions are opposite. Fixing grooves 34 are formed at the ends of the two entrance grooves 33. During the rotation of the driving rod 32 to be in a straight line with the transmission rod 4, the clamping shaft 63 passes through the entrance groove 33 and enters the fixing groove 34.

[0044] In this implementation: The diameter of the fixing shaft 64 is larger than that of the clamping shaft 63. During the process of the clamping shaft 63 entering the fixing groove 34, the fixing shaft 64 can clamp the bottom surface of the driving rod 32 to limit the position of the driving rod 32; the width of the entrance groove 33 is larger than that of the clamping shaft 63, which facilitates the entry of the clamping shaft 63 into the entrance groove 33 and allows it to move along the entrance groove 33 without obstruction; the fixing groove 34 matches the clamping shaft 63, which facilitates the further limitation of the position of the clamping shaft 63 to the fixing groove 34 and prevents shaking; the clamping shaft 63 is at the same height as the entrance groove 33 and the fixing groove 34, so that the clamping shaft 63 can accurately pass through the entrance groove 33 and enter the fixing groove 34.

[0045] In this implementation: After the clamping shaft 63 enters the fixing groove 34, it slides along the fixing groove 34 and reaches the side of the fixing groove 34 away from the entrance groove 33 through the fixing groove 34, so as to stably fix the position of the driving rod 32.

[0046] In this implementation: The top end of the clamping shaft 63 is fixedly connected with a connecting shaft 62. The top end of the connecting shaft 62 is fixedly connected with a moving block 61. The top end of the moving block 61 is threadedly connected with a screw rod 65. The free end of the screw rod 65 extends out of the plugging shell 2 and is fixedly connected with a handle 66. When the handle 66 is not closely attached to the top end of the plugging shell 2, the handle 66 drives the moving block 61 to move through the screw rod 65. The moving block 61 drives the clamping shaft 63 and the fixing shaft 64 to slide along the fixing groove 34 through the connecting shaft 62 and reaches the side of the fixing groove 34 away from the entrance groove 33 through the fixing groove 34, so as to stably fix the position of the driving rod 32. The above process is convenient and fast, and the position of the driving rod 32 can be fixed without a complex structure.

[0047] In this implementation: First chutes 24, second chutes 25 and third chutes 26 are formed at the top end of the plugging shell 2. The connecting shaft 62, the moving block 61 and the screw rod 65 slide along the first chute 24, the second chute 25 and the third chute 26 respectively. The width of the second chute 25 is larger than that of the first chute 24, and the width of the moving block 61 is larger than the diameter of the connecting shaft 62, which can prevent the moving block 61 from detaching from the second chute 25 through the first chute 24.

[0048] The fixing process of the fixing mechanism 6 for the driving rod 32 is as follows:

[0049] First, during the rotation of the driving rod 32 to be in a straight line with the transmission rod 4, the clamping shaft 63 passes through the entry groove 33 and enters the fixing groove 34. Then, rotate the handle 66, turn the handle 66 away from the top of the sealing shell 2, and ensure that the screw rod 65 does not screw out of the moving block 61. Then drive the moving block 61 to slide along the second sliding groove 25 through the screw rod 65. The moving block 61 drives the connecting shaft 62 to move along the first sliding groove 24. The connecting shaft 62 drives the clamping shaft 63 and the fixing shaft 64 to slide along the fixing groove 34, and reaches the side of the fixing groove 34 away from the entry groove 33, so as to achieve the purpose of stably fixing the position of the driving rod 32. Finally, rotate the handle 66 in the reverse direction so that the handle 66 is close to the top of the sealing shell 2 to fix the position of the fixing mechanism 6.

[0050] The above is only the preferred specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and the inventive concept of the present invention, makes equivalent replacements or changes, and should be covered within the protection scope of the present invention.

Claims

1. A hydraulic cylinder rust prevention device, comprising a cylinder body (1) and a blocking device, characterized in that: The outer wall of the cylinder body (1) is provided with a through hole (11) communicating with the inner cavity. The blocking device is used to block the through hole (11) and comprises a blocking shell (2), and a driving mechanism (3), a transmission rod (4) and a locking rod (5) located in the blocking shell (2). The driving mechanism (3) comprises a rotating shaft (31) and a driving rod (32). The rotating shaft (31) is rotatably connected to the blocking shell (2) and one end of the rotating shaft (31) is fixedly mounted on the central side of the driving rod (32). The rotating shaft (31) is used to drive the central rotation of the driving rod (32). The transmission rod (4) is provided with Two, and are respectively rotatably connected to the two ends of the driving rod (32), the free ends of the two driving rods (4) are respectively rotatably connected to the two locking rods (5), the two locking rods (5) are slidably connected to the side walls of the blocking shell (2), and the free ends extend out of the blocking shell (2), the free ends of the locking rods (5) are inserted into the locking holes (12), and the blocking shell (2) is fixed to the through hole (11), the locking holes (12) are opened on the side walls of the through hole (11), and the blocking shell (2) is also provided with a fixing mechanism (6) for fixing the driving rod (32).

2. The hydraulic cylinder anti-rust device according to claim 1, characterized in that: The rotation plane of the driving rod (32) is perpendicular to the rotating shaft (31); the rotating shaft (31) is rotatably connected to the top end of the blocking shell (2) via a bearing; the driving rod (32) drives the two transmission rods (4) to rotate synchronously; the two transmission rods (4) drive the two locking rods (5) to slide synchronously and are inserted into the locking holes (12); the locking holes (12) correspond to and match the free ends of the locking rods (5).

3. The hydraulic cylinder anti-rust device according to claim 2, characterized in that: The blocking shell (2) is provided with a receiving chamber (21), the driving mechanism (3), the transmission rod (4) and the locking rod (5) are all located in the receiving chamber (21), the side wall of the blocking shell (2) is provided with two through holes (22) penetrating the receiving chamber (21), the cross sections of the two locking rods (5) match the through holes (22) and are slidably connected, and the free end of the rotating shaft (31) is fixedly connected to the rotating disk (35).

4. The hydraulic cylinder rust prevention device according to claim 3, characterized in that: The fixing mechanism (6) comprises a clamping shaft (63) and a fixing shaft (64) located in the accommodating cavity (21); the fixing shaft (64) is located below the clamping shaft (63) and has a diameter larger than the clamping shaft (63); after the locking rod (5) is fully inserted into the locking hole (12), the driving rod (32) and the two transmission rods (4) are in a straight line; entry grooves (33) are provided on both sides of the driving rod (32); the two entry grooves (33) are located on both sides of the rotating shaft (31) and have opposite opening directions; and fixing grooves (34) are provided at the ends of the two entry grooves (33).

5. The hydraulic cylinder anti-rust device according to claim 4, characterized in that: The width of the entry groove (33) is greater than that of the clamping shaft (63), the fixing groove (34) matches the clamping shaft (63), and the clamping shaft (63) and the entry groove (33) and the fixing groove (34) are at the same height; When the driving rod (32) is rotated to be in a straight line with the transmission rod (4), the clamping shaft (63) passes through the entry groove (33) and enters the fixing groove (34), and the clamping shaft (63) slides along the fixing groove (34) to fix the position of the driving rod (32).

6. The hydraulic cylinder anti-rust device according to claim 5, characterized in that: The top end of the clamping shaft (63) is fixedly connected to a connecting shaft (62), the top end of the connecting shaft (62) is fixedly connected to a moving block (61), the top end of the moving block (61) is threadedly connected to a screw rod (65), the free end of the screw rod (65) extends out of the sealing shell (2) and is fixedly connected to a handle (66).

7. The hydraulic cylinder anti-rust device according to claim 6, characterized in that: The top of the blocking shell (2) is provided with a first slide groove (24), a second slide groove (25) and a third slide groove (26); the connecting shaft (62), the moving block (61) and the screw rod (65) slide along the first slide groove (24), the second slide groove (25) and the third slide groove (26) respectively; the width of the second slide groove (25) is greater than that of the first slide groove (24); the width of the moving block (61) is greater than the diameter of the connecting shaft (62).

8. The hydraulic cylinder rust prevention device according to claim 7, characterized in that: A filter screen (9) is clamped in the lower end of the side wall of the accommodating chamber (21), a gas phase rust prevention bag (7) is arranged above the filter screen (9), and the gas phase rust prevention bag (7) is fixedly mounted on the side wall of the accommodating chamber (21) through a suspension device (8), and the driving mechanism (3) and the gas phase rust prevention bag (7) are separated by an isolation plate (23), and the isolation plate (23) is clamped on the side wall of the accommodating chamber (21).

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