Water meter capable of automatically controlling water consumption

Abstract

The utility model relates to the field of intelligent water meters, in particular to a water meter capable of automatically controlling water consumption. The problems that due to long-time use of an existing intelligent water meter and a tap water pipe, the connecting position is likely to be rusted, the intelligent water meter is inconvenient to disassemble and maintain in the later period, and the intelligent water meter is generally suspended to be connected with the water pipe and cannot be damaged after being used for a long time are solved. The connecting position of the intelligent water meter and the water tank may cause water seepage due to the gravity of the intelligent water meter, so that the sealing performance of the intelligent water meter is influenced. The intelligent water meter comprises an intelligent water meter body, a water inlet pipe, a water outlet pipe, a first sleeve, a first baffle ring, a second sleeve, a second baffle ring, a tap water pipe, a butt joint installation assembly and a bearing assembly. By arranging the butt-joint installation assembly, the connecting position of the butt-joint installation assembly and the intelligent water meter is prevented from being rusted, disassembly is convenient, and by arranging the bearing assembly, the intelligent water meter can be supported to a certain degree through the matching effect of the outer fixing cylinder and the L-shaped moving rod.

Description

Technical Field

[0001] The utility model relates to the field of intelligent water meters, and particularly relates to a water meter for automatically controlling water consumption. Background Art

[0002] With the continuous development of industrial economy and urban scale, water meters, as instruments for measuring water flow, are being installed and used more and more widely in industry, agriculture and residents' lives. At present, with the progress of technology, intelligent water meters have been popularized;

[0003] An intelligent water meter is a new type of water meter that uses modern microelectronics technology, modern sensing technology and intelligent IC card technology to measure water consumption and conduct water consumption data transmission and settlement transactions. Compared with traditional water meters that generally only have the functions of flow collection and mechanical pointer display of water consumption, it is a great progress. In addition to recording and electronically displaying water consumption, intelligent water meters can also control water consumption according to agreements, automatically calculate the water charges for stepped water prices, and can also store water consumption data;

[0004] At present, the intelligent water meters and water pipes on the market are rotationally connected by matching the internal thread of the water inlet pipe of the intelligent water meter with the external thread of the water pipe. However, such a connection method has great limitations in actual situations. Long-term use may cause corrosion at the connection, making it inconvenient to disassemble and repair the intelligent water meter later. And generally, the intelligent water meter is connected to the water pipe in a suspended manner. After long-term use, the connection position between the two may show water seepage due to the gravity of the intelligent water meter itself, affecting the sealing performance of the installation of the intelligent water meter. Content of the Utility Model

[0005] (1) Technical Problems to be Solved

[0006] In order to overcome the problem that the intelligent water meters and water pipes on the market are rotationally connected by matching the internal thread of the water inlet pipe of the intelligent water meter with the external thread of the water pipe. However, such a connection method has great limitations in actual situations. Long-term use may cause corrosion at the connection, making it inconvenient to disassemble and repair the intelligent water meter later. And generally, the intelligent water meter is connected to the water pipe in a suspended manner. After long-term use, the connection position between the two may show water seepage due to the gravity of the intelligent water meter itself, affecting the sealing performance of the installation of the intelligent water meter.

[0007] (2) Technical Solutions

[0008] The technical solution of the utility model is as follows: A water meter for automatically controlling water consumption, which includes an intelligent water meter, a water inlet pipe and a water outlet pipe, and also includes a first sleeve, a first retaining ring, a second sleeve, a second retaining ring, a water supply pipe, a docking and installation assembly and a supporting assembly. The water inlet of the intelligent water meter is fixedly connected with the water inlet pipe, and the water outlet of the intelligent water meter is fixedly connected with the water outlet pipe. The surfaces of the water inlet pipe and the water outlet pipe are both threadedly sleeved with the first sleeve, and a first retaining ring is fixedly connected inside each first sleeve. There are water supply pipes arranged on both sides of the intelligent water meter, and the surfaces of the water supply pipes on both sides are both threadedly sleeved with the second sleeve, and a second retaining ring is fixedly connected inside each second sleeve. A docking and installation assembly is fixedly installed between the first sleeve and the second sleeve, and a supporting assembly is fixedly installed on the bottom surface of the intelligent water meter.

[0009] Preferably, by setting the docking and installation assembly, the first connecting ear plate and the second connecting ear plate can be docked and fixed, so that the docking inner cylinder can be stably inserted into the docking outer cylinder, realizing the docking and fixing between the docking inner cylinder and the docking outer cylinder. In an indirect way, the intelligent water meter and the water supply pipe are connected, avoiding rusting at the connection position between the two, and facilitating disassembly. When the water meter is removed later, only the docking bolt between the first connecting ear plate and the second connecting ear plate needs to be removed, and then pulling the intelligent water meter can disassemble the intelligent water meter from the water supply pipe. This can not only realize the quick fixation of the water meter, but also facilitate the disassembly, installation and maintenance of the water meter in the later stage. By setting the supporting assembly, the cooperation of the outer fixing cylinder and the L-shaped moving rod can play a certain supporting role for the intelligent water meter, avoiding water leakage at the connection position between the intelligent water meter and the water supply pipe due to the influence of gravity, and improving the sealing performance of the connection between the intelligent water meter and the water supply pipe.

[0010] Furthermore, the first retaining ring is used to limit the installation depth of the water inlet pipe and the water outlet pipe, and the second retaining ring is used to limit the installation depth of the water supply pipe, facilitating the installation of the first sleeve and the second sleeve in place.

[0011] Furthermore, a first sealing ring is fixedly connected to the surface of the first retaining ring, and a second sealing ring is fixedly connected to the surface of the second retaining ring, which can improve the sealing performance of the connection between the water inlet pipe and the water outlet pipe and the first sleeve, and at the same time can improve the sealing performance of the connection between the second sleeve and the water supply pipe, ensuring that no water leakage occurs during use.

[0012] Further, the docking and installation assembly includes a first connecting ear plate, a docking outer cylinder, a second connecting ear plate, a docking inner cylinder and a docking bolt. The first connecting ear plate is fixedly sleeved on the surface of the first sleeve, the end of the first sleeve is fixedly connected with the docking outer cylinder, the second connecting ear plate is fixedly sleeved on the surface of the second sleeve, the end of the first sleeve is fixedly connected with the docking inner cylinder, the docking inner cylinder is inserted into the placement ring groove formed on the surface of the docking outer cylinder, the docking inner cylinder and the docking outer cylinder are slidably connected, and the first connecting ear plate and the second connecting ear plate are detachably connected by the docking bolt. Through the docking bolt, the first connecting ear plate and the second connecting ear plate can be docked and fixed, so that the docking inner cylinder can be stably inserted into the docking outer cylinder, realizing the docking and fixing between the docking inner cylinder and the docking outer cylinder. When the water meter is removed later, only the docking bolt between the first connecting ear plate and the second connecting ear plate needs to be removed, and then by pulling the intelligent water meter, the intelligent water meter can be disassembled from the water supply pipe. This not only enables the quick fixation of the water meter, but also facilitates the disassembly, installation and maintenance of the water meter in the later stage.

[0013] Further, a third sealing ring is fixedly connected to the inner wall of the docking outer cylinder. By setting the third sealing ring, the connection sealing performance between the docking inner cylinder and the docking outer cylinder can be improved, ensuring that the intelligent water meter will not leak during use.

[0014] Further, the supporting assembly includes a fixed shaft, an outer fixed cylinder, an L-shaped moving rod, a lower clamping block, a screw rod, an upper clamping block and a nut. The bottom surface of the intelligent water meter is fixedly connected with the fixed shaft, the bottom end of the fixed shaft is fixedly connected with the outer fixed cylinder, the L-shaped moving rods are slidably connected in the moving grooves opened at both ends of the outer fixed cylinder, the top end of each L-shaped moving rod is fixedly connected with a lower clamping block, the surface of the lower clamping block is symmetrically fixedly connected with screw rods, the upper clamping block is slidably sleeved on the surface of the screw rods, and the nut is also threadedly sleeved on the surface of the screw rods. By setting the supporting assembly, after the intelligent water meter is connected to the water supply pipe, the lower clamping block and the upper clamping block can be clamped on the surface of the water supply pipe, and then the cooperation of the outer fixed cylinder and the L-shaped moving rod can play a certain supporting role for the intelligent water meter, avoiding the leakage of water at the connection position between the intelligent water meter and the water supply pipe due to the influence of gravity, and improving the connection sealing performance between the intelligent water meter and the water supply pipe.

[0015] Further, the surface of the L-shaped moving rod is symmetrically fixedly connected with limit sliders, and the limit sliders are inserted into the inner part of the outer fixed cylinder and are slidably connected with the outer fixed cylinder, which can limit the moving track of the L-shaped moving rod in the outer fixed cylinder and prevent the L-shaped moving rod from moving out of the outer fixed cylinder.

[0016] (3) Beneficial effects

[0017] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0018] 1. By setting the first retaining ring and the second retaining ring, during use, the first retaining ring is used to limit the installation depth of the water inlet pipe and the water outlet pipe, and the second retaining ring is used to limit the installation depth of the water supply pipe, which facilitates the installation of the first sleeve and the second sleeve in place.

[0019] 2. By setting the first sealing ring and the second sealing ring, the sealing performance of the connection between the water inlet pipe and the water outlet pipe and the first sleeve can be improved, and at the same time, the sealing performance of the connection between the second sleeve and the water supply pipe can be improved, ensuring that there is no water leakage during use.

[0020] 3. By setting the docking installation component, the first connecting ear plate and the second connecting ear plate can be docked and fixed, so that the docking inner cylinder can be stably inserted into the docking outer cylinder, realizing the docking and fixing between the docking inner cylinder and the docking outer cylinder. The intelligent water meter and the water supply pipe are connected indirectly, avoiding corrosion at the connection position between the two, and facilitating disassembly. When the water meter is removed later, only the docking bolt between the first connecting ear plate and the second connecting ear plate needs to be removed, and by pulling the intelligent water meter, the intelligent water meter can be disassembled from the water supply pipe. This can not only achieve the rapid fixation of the water meter but also facilitate the disassembly, installation, and maintenance of the water meter in the later stage.

[0021] 4. By setting the pressing plate and the placing block, the clamping area of the artificial leather can be increased, thereby improving the fixing reliability of the artificial leather.

[0022] 5. By setting the third sealing ring, the connection sealing performance between the docking inner cylinder and the docking outer cylinder can be improved, ensuring that there is no water leakage during the use of the intelligent water meter.

[0023] 6. By setting the supporting component, after the intelligent water meter is connected to the water supply pipe, the lower clamping block and the upper clamping block can be clamped on the surface of the water supply pipe, and then the cooperation of the outer fixing cylinder and the L-shaped moving rod can play a certain supporting role for the intelligent water meter, avoiding water leakage at the connection position between the intelligent water meter and the water supply pipe due to the influence of gravity, and improving the connection sealing performance between the intelligent water meter and the water supply pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 Shows the first three-dimensional structure schematic diagram of the present utility model;

[0025] Figure 2 Shows the second three-dimensional structure schematic diagram of the present utility model;

[0026] Figure 3 Shows the structure schematic diagram of the intelligent water meter and the supporting component in the present utility model;

[0027] Figure 4The figure shows a schematic diagram of the connection structure of the supporting component in the present utility model;

[0028] Figure 5 The figure shows the schematic diagram of the connection structure of the docking and installation component in the present utility model Figure 1 ;

[0029] Figure 6 The figure shows the schematic diagram of the connection structure of the docking and installation component in the present utility model Figure 2 ;

[0030] Figure 7 The figure shows Figure 4 the enlarged structure schematic diagram of part A in

[0031] Figure 8 The figure shows the sectional structure schematic diagram of the docking and installation component in the present utility model.

[0032] Explanation of reference numerals: 1 - intelligent water meter, 2 - water inlet pipe, 3 - water outlet pipe, 4 - first sleeve, 5 - first connecting ear plate, 6 - first retaining ring, 7 - first sealing ring, 8 - docking outer cylinder, 9 - third sealing ring, 10 - second sleeve, 11 - second connecting ear plate, 12 - second retaining ring, 13 - second sealing ring, 14 - docking inner cylinder, 15 - docking bolt, 16 - fixed shaft, 17 - outer fixed cylinder, 18 - L-shaped moving rod, 19 - lower clamping block, 20 - screw rod, 21 - upper clamping block, 22 - nut, 23 - water supply pipe, 24 - limiting slider. Detailed implementation manners

[0033] The present utility model will be further described below in conjunction with the drawings and embodiments.

[0034] Embodiment 1:

[0035] Please refer to Figure 1-8, the present utility model provides an embodiment: a water meter for automatically controlling water consumption, which includes an intelligent water meter 1, a water inlet pipe 2 and a water outlet pipe 3, and also includes a first sleeve 4, a first retaining ring 6, a second sleeve 10, a second retaining ring 12, a water supply pipe 23, a docking installation component and a supporting component. The water inlet of the intelligent water meter 1 is fixedly connected to the water inlet pipe 2, and the water outlet of the intelligent water meter 1 is fixedly connected to the water outlet pipe 3. The surfaces of the water inlet pipe 2 and the water outlet pipe 3 are both threadedly sleeved with the first sleeve 4, and a first retaining ring 6 is fixedly connected to the inside of each first sleeve 4. There are water supply pipes 23 arranged on both sides of the intelligent water meter 1, and the surfaces of the water supply pipes 23 on both sides are both threadedly sleeved with the second sleeve 10, and a second retaining ring 12 is fixedly connected to the inside of each second sleeve 10. A docking installation component is fixedly installed between the first sleeve 4 and the second sleeve 10, and a supporting component is fixedly installed on the bottom surface of the intelligent water meter 1. The first retaining ring 6 is used to limit the installation depth of the water inlet pipe 2 and the water outlet pipe 3, and the second retaining ring 12 is used to limit the installation depth of the water supply pipe 23, which is convenient for installing the first sleeve 4 and the second sleeve 10 in place. A first sealing ring 7 is fixedly connected to the surface of the first retaining ring 6, and a second sealing ring 13 is fixedly connected to the surface of the second retaining ring 12, which can improve the sealing performance between the water inlet pipe 2 and the water outlet pipe 3 and the first sleeve 4, and at the same time can improve the sealing performance between the second sleeve 10 and the water supply pipe 23, ensuring that no water leakage occurs during use. The docking installation component includes a first connecting ear plate 5, a docking outer cylinder 8, a second connecting ear plate 11, a docking inner cylinder 14 and a docking bolt 15. The surface of the first sleeve 4 is fixedly sleeved with the first connecting ear plate 5, and the end of the first sleeve 4 is fixedly connected to the docking outer cylinder 8. The surface of the second sleeve 10 is fixedly sleeved with the second connecting ear plate 11, and the end of the first sleeve 4 is fixedly connected to the docking inner cylinder 14. The docking inner cylinder 14 is inserted into the placement ring groove opened on the surface of the docking outer cylinder 8, and the docking inner cylinder 14 and the docking outer cylinder 8 are slidably connected. The first connecting ear plate 5 and the second connecting ear plate 11 are detachably connected by the docking bolt 15. Through the docking bolt 15, the first connecting ear plate 5 and the second connecting ear plate 11 can be docked and fixed, so that the docking inner cylinder 14 can be stably inserted into the docking outer cylinder 8, realizing the docking and fixing between the docking inner cylinder 14 and the docking outer cylinder 8. When the water meter is to be removed later, only the docking bolt 15 between the first connecting ear plate 5 and the second connecting ear plate 11 needs to be removed, and by pulling the intelligent water meter 1, the intelligent water meter 1 can be disassembled from the water supply pipe 23. This can not only realize the quick fixation of the water meter, but also facilitate the disassembly, installation and maintenance of the water meter in the later stage. A third sealing ring 9 is fixedly connected to the inner wall of the docking outer cylinder 8. By setting the third sealing ring 9, the connection sealing performance between the docking inner cylinder 14 and the docking outer cylinder 8 can be improved, ensuring that no water leakage occurs during the use of the intelligent water meter 1.

[0036] It should be noted that the intelligent water meter 1 can realize the function of automatically controlling the water consumption, which is a known and mature technology in the prior art.

[0037] When using this intelligent water meter 1, first, the first sleeve 4 is respectively sleeved on the surfaces of the water inlet pipe 2 and the water outlet pipe 3 through threads. During this process, the connection depths of the water inlet pipe 2 and the water outlet pipe 3 can be limited by the action of the first retaining ring 6. Then, the second sleeve 10 is threaded on the surface of the water supply pipe 23, and the connection depth of the water supply pipe 23 is limited by the second retaining ring 12. Then, the docking inner cylinder 14 is inserted into the docking outer cylinder 8, and the docking bolts 15 are sequentially inserted into the first connecting ear plate 5. Then, the docking bolts 15 are respectively rotated so that the docking bolts 15 can be sequentially screwed into the second connecting ear plate 11 until the docking bolts 15 cannot be rotated anymore. At this time, the docking inner cylinder closely adheres to the surface of the third sealing ring 9, which can improve the connection tightness between the docking inner cylinder 14 and the docking outer cylinder 8 and ensure that the intelligent water meter 1 does not leak during use. Through the docking bolts 15, the first connecting ear plate 5 and the second connecting ear plate 11 can be docked and fixed, so that the docking inner cylinder 14 can be stably inserted into the docking outer cylinder 8, realizing the docking and fixing between the docking inner cylinder 14 and the docking outer cylinder 8. When the water meter is to be removed later, only the docking bolts 15 between the first connecting ear plate 5 and the second connecting ear plate 11 need to be removed, and by pulling the intelligent water meter 1, the intelligent water meter 1 can be disassembled from the water supply pipe 23. This can not only realize the quick fixing of the water meter but also facilitate the disassembly, installation, and maintenance of the water meter in the later stage.

[0038] Embodiment 2:

[0039] Please refer to Figure 1-8, in this embodiment, the supporting assembly includes a fixed shaft 16, an outer fixed cylinder 17, an L-shaped moving rod 18, a lower clamping block 19, a screw rod 20, an upper clamping block 21 and a nut 22. The bottom surface of the intelligent water meter 1 is fixedly connected to the fixed shaft 16, and the bottom end of the fixed shaft 16 is fixedly connected to the outer fixed cylinder 17. L-shaped moving rods 18 are slidably connected in the moving grooves opened at both ends of the outer fixed cylinder 17. The top end of each L-shaped moving rod 18 is fixedly connected to a lower clamping block 19. Screw rods 20 are symmetrically and fixedly connected to the surface of the lower clamping block 19. An upper clamping block 21 is slidably sleeved on the surface of the screw rod 20, and a nut 22 is also threadedly sleeved on the surface of the screw rod 20. By providing the supporting assembly, after the intelligent water meter 1 is connected to the water pipe, the lower clamping block 19 and the upper clamping block 21 can be clamped on the surface of the water pipe 23, and then the cooperation of the outer fixed cylinder 17 and the L-shaped moving rod 18 can play a certain supporting role for the intelligent water meter 1, avoiding the leakage of water at the connection position between the intelligent water meter 1 and the water pipe 23 due to the influence of gravity, and improving the sealing performance of the connection between the intelligent water meter 1 and the water pipe 23. Limiting sliders 24 are symmetrically and fixedly connected to the surface of the L-shaped moving rod 18. The limiting sliders 24 are inserted into the inner part of the outer fixed cylinder 17, and the limiting sliders 24 are slidably connected to the outer fixed cylinder 17, which can limit the moving track of the L-shaped moving rod 18 in the outer fixed cylinder 17 and prevent the L-shaped moving rod 18 from moving out of the outer fixed cylinder 17.

[0040] After the intelligent water meter 1 is installed, pull the L-shaped moving rod 18 to make the L-shaped moving rod 18 move in the outer fixed cylinder 17, and then the lower clamping block 19 can follow the movement, so that the lower clamping block 19 can contact the surface of the water pipe 23. At this time, sleeved the upper clamping block 21 on the surface of the screw rod 20, and then tighten the nut 22 in turn. By the cooperation of the upper clamping block 21 and the lower clamping block 19, the intelligent water meter 1 can be fixed to the water pipe 23, and then the cooperation of the outer fixed cylinder 17 and the L-shaped moving rod 18 can play a certain supporting role for the intelligent water meter 1, avoiding the leakage of water at the connection position between the intelligent water meter 1 and the water pipe 23 due to the influence of gravity, and improving the sealing performance of the connection between the intelligent water meter 1 and the water pipe 23.

[0041] The above has described in detail the embodiments of the present invention in conjunction with the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the purpose of the present invention.

Claims

1. A water meter for automatically controlling water consumption, comprising an intelligent water meter (1), a water inlet pipe (2) and a water outlet pipe (3), characterized in that: The intelligent water meter (1) further comprises a first sleeve (4), a first retaining ring (6), a second sleeve (10), a second retaining ring (12), a water pipe (23), a docking installation component and a supporting component. The water inlet of the intelligent water meter (1) is fixedly connected to the water inlet pipe (2), the water outlet of the intelligent water meter (1) is fixedly connected to the water outlet pipe (3), the surfaces of the water inlet pipe (2) and the water outlet pipe (3) are both threadedly sleeved with the first sleeve (4), the interior of each of the first sleeves (4) is fixedly connected with the first retaining ring (6), water pipes (23) are arranged on both sides of the intelligent water meter (1), the surfaces of the water pipes (23) on both sides are both threadedly sleeved with the second sleeve (10), the interior of each of the second sleeves (10) is fixedly connected with the second retaining ring (12), a docking installation component is fixedly installed between the first sleeve (4) and the second sleeve (10), and a supporting component is fixedly installed on the bottom surface of the intelligent water meter (1).

2. A water meter for automatically controlling water consumption according to claim 1, characterized in that: The first retaining ring (6) is used to limit the installation depth of the water inlet pipe (2) and the water outlet pipe (3), and the second retaining ring (12) is used to limit the installation depth of the tap water pipe (23), so as to facilitate the installation of the first sleeve (4) and the second sleeve (10) in place.

3. A water meter for automatically controlling water consumption according to claim 2, characterized in that: A first sealing ring (7) is fixedly connected to the surface of the first retaining ring (6), and a second sealing ring (13) is fixedly connected to the surface of the second retaining ring (12).

4. A water meter for automatically controlling water consumption according to claim 1, characterized in that: The docking installation assembly comprises a first connecting ear plate (5), a docking outer tube (8), a second connecting ear plate (11), a docking inner tube (14) and a docking bolt (15); the first connecting ear plate (5) is fixedly sleeved on the surface of the first sleeve (4); the end of the first sleeve (4) is fixedly sleeved on the surface of the second sleeve (10); the second connecting ear plate (11) is fixedly sleeved on the surface of the second sleeve (10); the end of the first sleeve (4) is fixedly sleeved on the docking inner tube (14); the docking inner tube (14) is inserted into a placement annular groove provided on the surface of the docking outer tube (8); the docking inner tube (14) and the docking outer tube (8) are slidably connected; the first connecting ear plate (5) and the second connecting ear plate (11) are detachably connected via the docking bolt (15).

5. A water meter for automatically controlling water consumption according to claim 4, characterized in that: The inner wall of the docking outer cylinder (8) is fixedly connected to a third sealing ring (9). By providing the third sealing ring (9), the sealing performance of the connection between the docking inner cylinder (14) and the docking outer cylinder (8) can be improved, thereby ensuring that the smart water meter (1) will not leak during use.

6. A water meter for automatically controlling water consumption according to claim 1, characterized in that: The supporting assembly comprises a fixed shaft (16), an external fixed cylinder (17), an L-shaped moving rod (18), a lower clamping block (19), a screw (20), an upper clamping block (21) and a nut (22); the bottom surface of the smart water meter (1) is fixedly connected to the fixed shaft (16); the bottom end of the fixed shaft (16) is fixedly connected to the external fixed cylinder (17); the moving grooves at both ends of the external fixed cylinder (17) are slidably connected to the L-shaped moving rod (18); the top end of each L-shaped moving rod (18) is fixedly connected to the lower clamping block (19); the surface of the lower clamping block (19) is symmetrically fixedly connected to the screw (20); the surface of the screw (20) is slidably sleeved with the upper clamping block (21); the surface of the screw (20) is also threadedly sleeved with the nut (22).

7. A water meter for automatically controlling water consumption according to claim 6, characterized in that: The surface of the L-shaped moving rod (18) is symmetrically fixedly connected to a limiting slider (24), the limiting slider (24) is inserted into the interior of the external fixing tube (17), and the limiting slider (24) and the external fixing tube (17) are slidably connected, so as to limit the moving trajectory of the L-shaped moving rod (18) in the external fixing tube (17) and prevent the L-shaped moving rod (18) from moving out of the external fixing tube (17).

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