An elongate rod

Abstract

This invention relates to the field of valve technology, specifically disclosing an extension rod that passes through a first mounting hole in a shielding layer. The extension rod includes a sleeve and an operating rod passing through the sleeve. Both ends of the operating rod extend from a first end face and a second end face of the shielding layer, respectively, and the operating rod can rotate within the sleeve. A first positioning mechanism is fitted onto the end of the operating rod near the first end face, and the first positioning mechanism is fixed to the first end face. The operating rod can rotate within the first positioning mechanism. The end of the operating rod near the second end face is connected to a rotating component of a second positioning mechanism. The housing of the second positioning mechanism is fixed to the second end face. The operating rod can drive the rotating component to rotate within the housing, which in turn drives the valve stem to rotate by a preset angle, thus opening and closing the valve. This design is convenient to use, has a simple structure, is easy to manufacture, and has low cost.

Description

Technical Field

[0001] This invention relates to the field of valve technology, and more particularly to an extension rod. Background Technology

[0002] In the prior art, some valves are installed on one side of a wall or other shielding layer. When the operator is on the other side of the wall or other shielding layer, that is, the opposite side of the valve or instrument, it is impossible to operate the valve, and sampling or operation is inconvenient. Summary of the Invention

[0003] The purpose of this invention is to provide an extension rod that can operate the valve through the shielding layer, enabling short-range operation, making it more convenient to use, while also having a relatively simple structure, being easy to manufacture, and having a low cost.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] This invention provides an extension rod that passes through a shielding layer. The shielding layer includes a first end face and a second end face disposed opposite to each other. The shielding layer has a first mounting hole that penetrates the first end face and the second end face. The extension rod includes:

[0006] A sleeve is disposed in the first mounting hole, and the interior of the sleeve is hollow to form an installation space;

[0007] An operating rod is inserted into the sleeve, and the two ends of the operating rod extend out from the first end face and the second end face of the shielding layer, respectively. The operating rod is rotatable within the installation space.

[0008] A first positioning mechanism is sleeved on the end of the operating rod near the first end face and fixedly connected to the first end face of the shielding layer. The operating rod can rotate within the first positioning mechanism.

[0009] The second positioning mechanism includes a housing and a rotating component. The housing is fixed to the second end face of the shielding layer, and the rotating component is disposed inside the housing and can rotate within the housing. One end of the operating rod near the second end face is connected to one end of the rotating component, and the other end of the rotating component is connected to the valve stem of the valve.

[0010] When torque is applied to the operating lever, the operating lever rotates within the mounting space of the sleeve, and drives the rotating component to rotate synchronously within the housing. The rotating component then drives the valve stem of the valve to rotate synchronously by a preset angle.

[0011] Optionally, the first positioning mechanism includes a bearing housing and a first bearing. The bearing housing and the first bearing are both sleeved on the operating rod. The first bearing is used to support the end of the operating rod near the first end face. The bearing housing has a first annular step portion on the side away from the first end face, and the first bearing is embedded in the first annular step portion.

[0012] Optionally, a positioning disk is fixedly provided on the operating lever. The positioning disk is located on the side of the first positioning mechanism away from the first end face. The positioning disk is provided with a plurality of positioning holes, which are spaced apart along the circumference of the positioning disk.

[0013] The bearing housing has a second mounting hole on the side opposite to the first end face. A first limiting component is disposed in the second mounting hole. The first limiting component is configured such that when the first limiting component is not aligned with the positioning hole, the first limiting component abuts against the end face of the positioning plate near the bearing housing; when the first limiting component is aligned with the positioning hole, the first limiting component pops out from the positioning hole.

[0014] Optionally, the first positioning mechanism further includes a second limiting component, which includes a connector and a limiting piece. The operating rod has an annular limiting groove corresponding to the position of the bearing seat. The annular limiting groove is coaxially arranged with the operating rod. The limiting piece is embedded in the annular limiting groove. The bearing seat has a third mounting hole along its radial direction. The connector passes through the third mounting hole and connects to the limiting piece. The limiting piece is used to restrict the movement of the operating rod along its axial direction.

[0015] Optionally, the rotating component includes a first cylindrical body, and the operating rod is provided with a connecting part at one end near the second end face. The first cylindrical body is provided with a first insertion hole at the end connected to the operating rod. The opening shape of the first insertion hole matches the connecting part, and the connecting part is inserted into the first insertion hole.

[0016] The first cylinder is provided with a second insertion hole at the end where it is connected to the valve stem. The opening shape of the second insertion hole matches the valve stem, and the valve stem is inserted into the second insertion hole.

[0017] Optionally, the connecting part is provided with a fourth mounting hole, the third limiting component is disposed in the fourth mounting hole, the wall surface of the first insertion hole is provided with a groove, and the third limiting component is configured to be engaged in the groove when the third limiting component is aligned with the groove.

[0018] Optionally, the cross-section of the connecting portion is polygonal.

[0019] Optionally, the rotating component further includes a second cylinder connected to the first cylinder, the diameter of the second cylinder being larger than that of the first cylinder, the bottom wall of the second cylinder being engaged with a second annular step portion on the inner wall of the housing, and a through hole being provided on the bottom wall of the second cylinder, through which the valve stem passes and is inserted into the first insertion hole;

[0020] The bottom wall of the second cylinder is provided with a limiting platform, and the valve includes a valve cover. The valve cover has a semi-circular boss on one side facing the second cylinder, and the limiting platform abuts against the semi-circular boss.

[0021] Optionally, a second bearing is fitted onto the rotating component, and a third annular step is provided on the inner wall of the housing, with the second bearing sandwiched between the third annular step and the rotating component.

[0022] Optionally, the second positioning mechanism further includes a first fixing plate and a second fixing plate, wherein the first fixing plate is disposed on the side of the housing near the second end face, and the second fixing plate is disposed on the side of the housing near the valve.

[0023] The beneficial effects of this invention are as follows:

[0024] This invention provides an extension rod that passes through a first mounting hole in a shielding layer. The extension rod includes a sleeve and an operating rod passing through the sleeve. Both ends of the operating rod extend from a first end face and a second end face of the shielding layer, respectively, and the operating rod can rotate within the sleeve. A first positioning mechanism is fitted onto the end of the operating rod near the first end face, and the first positioning mechanism is fixed to the first end face. The operating rod can rotate within the first positioning mechanism. The end of the operating rod near the second end face is connected to a rotating component of a second positioning mechanism. The housing of the second positioning mechanism is fixed to the second end face. The operating rod can drive the rotating component to rotate within the housing, which in turn drives the valve stem of a valve to rotate by a preset angle, thereby opening and closing the valve. This design is convenient to use, has a simple structure, is easy to manufacture, and has a low cost. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the assembly structure of the extension rod and the shielding layer provided in an embodiment of the present invention;

[0026] Figure 2 This is an isometric view of the extension rod provided in an embodiment of the present invention;

[0027] Figure 3 This is a front view of the extension rod provided in an embodiment of the present invention;

[0028] Figure 4 for Figure 3 Cross-sectional view of section AA;

[0029] Figure 5 for Figure 3 Cross-sectional view of section BB in the middle;

[0030] Figure 6 This is a schematic diagram of the assembly structure of the operating lever and the first positioning mechanism provided in an embodiment of the present invention;

[0031] Figure 7 This is a schematic diagram of the assembly structure of the operating lever and the second positioning mechanism provided in an embodiment of the present invention;

[0032] Figure 8 This is an isometric view of the operating lever provided in an embodiment of the present invention;

[0033] Figure 9 for Figure 8 A magnified view of a section at point C;

[0034] Figure 10 This is an exploded view of the first positioning mechanism provided in an embodiment of the present invention;

[0035] Figure 11 This is an exploded view of the second positioning mechanism provided in an embodiment of the present invention;

[0036] Figure 12 This is an exploded view of the second positioning mechanism provided in an embodiment of the present invention from another perspective;

[0037] Figure 13 This is a cross-sectional view of the rotating component provided in an embodiment of the present invention;

[0038] Figure 14 This is an isometric view of the valve provided in an embodiment of the present invention.

[0039] In the picture:

[0040] 10. Shielding layer; 11. First end face; 12. Second end face; 13. First mounting hole;

[0041] 20. Valve; 21. Valve stem; 22. Valve cover; 23. Semi-circular boss; 24. Valve body;

[0042] 100. Sleeve;

[0043] 200, Operating lever; 210, Positioning plate; 2101, Positioning hole; 220, Handle; 230, Connecting part; 2301, Fourth mounting hole; 240, Third limiting assembly; 241, Second pin; 242, Second spring; 2501, Annular limiting groove;

[0044] 300, First positioning mechanism; 310, Bearing housing; 3101, First annular step portion; 3102, Second mounting hole; 3103, Third mounting hole; 320, First bearing; 330, First limiting assembly; 331, First pin; 332, First spring; 340, Second limiting assembly; 341, Connecting piece; 342, Limiting plate;

[0045] 400, Second positioning mechanism; 410, Housing; 4101, Second annular step portion; 4102, Third annular step portion; 420, Rotating component; 421, First cylinder; 4211, First insertion hole; 4212, Second insertion hole; 4213, Groove; 4214, Guide surface; 422, Second cylinder; 4221, Through hole; 4222, Limiting platform; 430, Second bearing; 440, First fixing plate; 450, Second fixing plate; 4501, Strip-shaped limiting groove. Detailed Implementation

[0046] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0047] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The terms "first position" and "second position" refer to two different positions. Furthermore, "above," "on top of," and "over" the first feature in relation to the second feature includes the first feature directly above and diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "under," and "below" the first feature in relation to the second feature includes the first feature directly below and diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0048] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0049] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0050] like Figures 1-5 As shown, this embodiment provides an extension rod that passes through a shielding layer 10, such as a wall. The shielding layer 10 includes a first end face 11 and a second end face 12 disposed opposite to each other. The shielding layer 10 is provided with a first mounting hole 13 that penetrates the first end face 11 and the second end face 12. The operating end of the extension rod and the valve 20 are respectively disposed on one side of the first end face 11 and the second end face 12.

[0051] Specifically, the extension rod includes a sleeve 100, an operating rod 200, a first positioning mechanism 300, and a second positioning mechanism 400. The sleeve 100 is disposed within the first mounting hole 13 of the shielding layer 10, and the interior of the sleeve 100 is hollow to form an installation space. The operating rod 200 passes through the sleeve 100, and its two ends extend from the first end face 11 and the second end face 12 of the shielding layer 10, respectively. The operating rod 200 can rotate within the installation space of the sleeve 100, so that when the operator rotates the operating rod 200 on the first end face 11 side of the shielding layer 10, it can drive the valve stem 21 of the valve 20 disposed on the second end face 12 of the shielding layer 10 to rotate, thereby realizing the opening and closing of the valve 20.

[0052] Optionally, to facilitate the operator's rotation of the operating lever 200, a handle 220 is provided at the end of the operating lever 200 near the first positioning mechanism 300. When the operator operates the operating lever 200, he / she can hold the handle 220 to rotate it, which makes it easier to apply force and more convenient to use.

[0053] Furthermore, the first positioning mechanism 300 is sleeved on the end of the operating rod 200 near the first end face 11 and is fixedly connected to the first end face 11 of the shielding layer 10. The operating rod 200 can rotate within the first positioning mechanism 300. The second positioning mechanism 400 includes a housing 410 and a rotating component 420. The housing 410 is fixed to the second end face 12 of the shielding layer 10. The rotating component 420 is disposed within the housing 410 and can rotate within the housing 410. The end of the operating rod 200 near the second end face 12 is connected to one end of the rotating component 420, and the other end of the rotating component 420 is connected to the valve stem 21 of the valve 20. When torque is applied to the operating rod 200, the operating rod 200 rotates within the mounting space of the sleeve 100, and drives the rotating component 420 to rotate synchronously within the housing 410. Thus, the rotating component 420 drives the valve stem 21 of the valve 20 to rotate synchronously by a preset angle, thereby realizing the opening and closing of the valve 20.

[0054] The first positioning mechanism 300 and the second positioning mechanism 400 can support the operating lever 200, so that when the operating lever 200 rotates in the installation space of the sleeve 100, it will not contact the inner wall of the sleeve 100, thereby improving the smoothness of the rotation of the operating lever 200.

[0055] As an alternative solution, see Figure 6 In this embodiment, the first positioning mechanism 300 includes a bearing seat 310 and a first bearing 320. Both the bearing seat 310 and the first bearing 320 are sleeved on the operating rod 200. The first bearing 320 supports the end of the operating rod 200 near the first end face 11, providing good support for the operating rod 200 and ensuring smooth rotation. The bearing seat 310 has a first annular step portion 3101 on the side facing away from the first end face 11, and the first bearing 320 is embedded within the first annular step portion 3101. The first annular step portion 3101 improves the compactness of the first positioning mechanism 300 and reduces interference with other components. For example, the bearing seat 310 has several first fixing holes circumferentially. Bolts or other locking components pass through these holes and are threadedly connected to the first end face 11 of the shielding layer 10, thereby fixing the bearing seat 310.

[0056] Furthermore, a positioning disk 210 is fixedly mounted on the operating lever 200. The positioning disk 210 is located on the side of the first positioning mechanism 300 opposite to the first end face 11. The positioning disk 210 has a plurality of positioning holes 2101, which are spaced apart circumferentially along the positioning disk 210. A second mounting hole 3102 is provided on the side of the bearing seat 310 opposite to the first end face 11, and a first limiting component 330 is disposed in the second mounting hole 3102. The first limiting component 330 is configured such that when the first limiting component 330 is not aligned with the positioning hole 2101, the first limiting component 330 abuts against the end face of the positioning disk 210 near the bearing seat 310; when the first limiting component 330 is aligned with the positioning hole 2101, the first limiting component 330 pops out from the positioning hole 2101. The first limiting component 330 serves as an indicator. When the first limiting component 330 extends from the positioning hole 2101, it emits an audible sound to indicate to the operator that the preset angle has been rotated and the operation is complete. Furthermore, when the first limiting component 330 extends from the positioning hole 2101, it also acts as a limit, preventing the operating lever 200 from rotating further.

[0057] Optionally, the first limiting component 330 includes a first pin 331 and a first spring 332. The first spring 332 is fixed in the second mounting hole 3102 and is connected to the first pin 331. The first pin 331 can be ejected from the second mounting hole 3102 by the first spring 332 and then pass through the positioning hole 2101 on the positioning plate 210.

[0058] See Figure 4 , Figure 8 and Figure 10 In this embodiment, the first positioning mechanism 300 further includes a second limiting component 340. The second limiting component 340 includes a connector 341 and a limiting piece 342. An annular limiting groove 2501 is provided on the operating rod 200 corresponding to the bearing seat 310. The annular limiting groove 2501 is coaxially arranged with the operating rod 200. The limiting piece 342 is arc-shaped and matches the annular limiting groove 2501 of the operating rod 200, and is embedded within the annular limiting groove 2501. A third mounting hole 3103 is provided on the bearing seat 310 along its radial direction. The connector 341 passes through the third mounting hole 3103 and connects to the limiting piece 342. The limiting piece 342 restricts the movement of the operating rod 200 along its axial direction, ensuring accurate positioning of the operating rod 200. Optionally, the connector 341 can be a hexagonal bolt, which engages with a pre-set threaded hole on the limiting piece 342.

[0059] See also Figure 7 , Figure 9 and Figure 13The rotating component 420 includes a first cylindrical body 421. The operating lever 200 has a connecting portion 230 at one end near the second end face 12. The end of the first cylindrical body 421 connected to the operating lever 200 has a first insertion hole 4211. The opening shape of the first insertion hole 4211 matches the connecting portion 230, and the connecting portion 230 is inserted into the first insertion hole 4211. The end of the first cylindrical body 421 connected to the valve stem 21 has a second insertion hole 4212. The opening shape of the second insertion hole 4212 matches the valve stem 21, and the valve stem 21 is inserted into the second insertion hole 4212. This allows the torque of the operating lever 200 to be transmitted to the rotating component 420, which in turn drives the valve stem 21 to rotate.

[0060] More preferably, a guide surface 4214 can be provided at the entrance of the first socket 4211. Specifically, the guide surface 4214 can be a sloped surface or an arc surface with a rounded transition. The guide surface 4214 can guide the connecting part 230 of the operating lever 200 when it enters the first socket 4211, so as to facilitate the smooth insertion of the connecting part 230 into the first socket 4211.

[0061] As an alternative solution, see Figure 5 The cross-section of the connecting part 230 is polygonal. For example, the cross-section of the connecting part 230 can be trapezoidal, thereby determining the installation direction of the operating lever 200, ensuring accurate positioning, and simultaneously enabling the transmission of torque, which drives the rotating part 420 to rotate via the operating lever 200. Of course, the cross-section of the connecting part 230 can also be set to other shapes.

[0062] Further, see also Figure 7 , Figure 9 and Figure 13 The connecting part 230 is provided with a fourth mounting hole 2301, and a third limiting component 240 is disposed in the fourth mounting hole 2301. A groove 4213 is provided on the wall surface of the first insertion hole 4211. The third limiting component 240 is configured to engage in the groove 4213 when aligned with it. For example, the third limiting component 240 includes a second pin 241 and a second spring 242. The second spring 242 is fixed in the fourth mounting hole 2301 and connected to the second pin 241. The second spring 242 can eject the second pin 241 from the fourth mounting hole 2301, thereby engaging it in the groove 4213 on the rotating part 420. The third limiting component 240 also limits the displacement of the operating rod 200 along its axial direction. Furthermore, when the third limiting component 240 is engaged in the groove 4213, it will also make a sound to indicate that the operating lever 200 and the rotating component 420 have been installed in place and are fixed together.

[0063] Optionally, see Figure 7 , Figure 11 and Figure 12 The rotating component 420 also includes a second cylinder 422 connected to the first cylinder 421. The diameter of the second cylinder 422 is larger than that of the first cylinder 421. The bottom wall of the second cylinder 422 is fitted onto the second annular step portion 4101 on the inner wall of the housing 410. The bottom wall of the second cylinder 422 is provided with a through hole 4221. The valve stem 21 passes through the through hole 4221 and is inserted into the first insertion hole 4211.

[0064] See Figure 12 and Figure 14 The bottom wall of the second cylinder 422 is provided with a limiting platform 4222. The valve 20 includes a valve cover 22, and a semi-circular boss 23 is provided on the side of the valve cover 22 facing the second cylinder 422. The limiting platform 4222 abuts against the semi-circular boss 23. This achieves the positioning of the valve cover 22, ensuring accurate installation between the rotating part 420 and the valve 20, so that the valve stem 21 can smoothly pass through the through hole 4221 and be inserted into the second insertion hole 4212 of the rotating part 420.

[0065] Furthermore, a second bearing 430 is fitted onto the rotating component 420, and a third annular step portion 4102 is provided on the inner wall of the housing 410. The second bearing 430 is sandwiched between the third annular step portion 4102 and the rotating component 420. The second bearing 430 can support the rotating component 420 and ensure that the rotating component 420 rotates smoothly within the housing 410.

[0066] Optionally, the second positioning mechanism 400 further includes a first fixing plate 440 and a second fixing plate 450. The first fixing plate 440 is disposed on the side of the housing 410 near the second end face 12, and the second fixing plate 450 is disposed on the side of the housing 410 near the valve 20. That is, the first fixing plate 440 and the second fixing plate 450 sandwich the housing 410 in the middle. Exemplarily, the first fixing plate 440 and the second fixing plate 450 are provided with a plurality of second fixing holes in their circumference. Bolts or other locking components pass through the second fixing holes and are threadedly connected to the second end face 12 of the shielding layer 10, thereby fixing the housing 410 of the second positioning mechanism 400.

[0067] Preferably, the second fixing plate 450 is also provided with a strip-shaped limiting groove 4501 on the side near the valve 20. The shape of the strip-shaped limiting groove 4501 matches the valve body 24 of the valve 20, thereby having a certain limiting effect on the valve 20 and ensuring that the installation position of the valve 20 is accurate.

[0068] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. An extension pole, characterized in that, The extension rod is inserted through a shielding layer (10), which includes a first end face (11) and a second end face (12) disposed opposite to each other. A first mounting hole (13) is provided on the shielding layer (10), penetrating the first end face (11) and the second end face (12). The extension rod includes: A sleeve (100) is disposed in the first mounting hole (13), and the interior of the sleeve (100) is hollow to form an installation space; An operating lever (200) is inserted into the sleeve (100), and the two ends of the operating lever (200) extend out of the first end face (11) and the second end face (12) of the shielding layer (10), respectively. The operating lever (200) is rotatable within the installation space. The first positioning mechanism (300) is sleeved on one end of the operating rod (200) near the first end face (11) and is fixedly connected to the first end face (11) of the shielding layer (10). The operating rod (200) can rotate within the first positioning mechanism (300). The second positioning mechanism (400) includes a housing (410) and a rotating component (420). The housing (410) is fixed to the second end face (12) of the shielding layer (10). The rotating component (420) is disposed inside the housing (410) and can rotate inside the housing (410). One end of the operating rod (200) near the second end face (12) is connected to one end of the rotating component (420), and the other end of the rotating component (420) is connected to the valve stem (21) of the valve (20). When torque is applied to the operating lever (200), the operating lever (200) rotates within the mounting space of the sleeve (100) and drives the rotating component (420) to rotate synchronously within the housing (410). The rotating component (420) drives the valve stem (21) of the valve (20) to rotate synchronously by a preset angle. The rotating component (420) includes a first cylindrical body (421), and the operating rod (200) has a connecting part (230) at one end near the second end face (12). The first cylindrical body (421) is connected to the operating rod (200) and has a first insertion hole (4211). The opening shape of the first insertion hole (4211) matches the connecting part (230), and the connecting part (230) is inserted into the first insertion hole (4211). The first cylinder (421) is provided with a second insertion hole (4212) at one end connected to the valve stem (21). The opening shape of the second insertion hole (4212) matches the valve stem (21), and the valve stem (21) is inserted into the second insertion hole (4212). The rotating component (420) further includes a second cylinder (422) connected to the first cylinder (421). The diameter of the second cylinder (422) is larger than that of the first cylinder (421). The bottom wall of the second cylinder (422) is fitted into a second annular step portion (4101) on the inner wall of the housing (410). A through hole (4221) is provided on the bottom wall of the second cylinder (422). The valve stem (21) passes through the through hole (4221) and is inserted into the first insertion hole (4211). The bottom wall of the second cylinder (422) is provided with a limiting platform (4222), and the valve (20) includes a valve cover (22). The valve cover (22) has a semi-circular boss (23) on the side facing the second cylinder (422), and the limiting platform (4222) abuts against the semi-circular boss (23).

2. The extension pole of claim 1, wherein The first positioning mechanism (300) includes a bearing seat (310) and a first bearing (320). The bearing seat (310) and the first bearing (320) are both sleeved on the operating rod (200). The first bearing (320) is used to support the end of the operating rod (200) near the first end face (11). The bearing seat (310) has a first annular step portion (3101) on the side away from the first end face (11). The first bearing (320) is embedded in the first annular step portion (3101).

3. The extension pole of claim 2, wherein, The operating lever (200) is fixedly provided with a positioning disk (210), the positioning disk (210) is located on the side of the first positioning mechanism (300) away from the first end face (11), the positioning disk (210) is provided with a plurality of positioning holes (2101), and the plurality of positioning holes (2101) are spaced apart along the circumference of the positioning disk (210); The bearing housing (310) has a second mounting hole (3102) on the side opposite to the first end face (11). A first limiting component (330) is disposed in the second mounting hole (3102). The first limiting component (330) is configured such that when the first limiting component (330) is not aligned with the positioning hole (2101), the first limiting component (330) abuts against the end face of the positioning plate (2100) near the bearing housing (310); when the first limiting component (330) is aligned with the positioning hole (2101), the first limiting component (330) pops out from the positioning hole (2101).

4. The extension pole of claim 2, wherein, The first positioning mechanism (300) further includes a second limiting component (340), which includes a connector (341) and a limiting piece (342). The operating lever (200) has an annular limiting groove (2501) corresponding to the position of the bearing seat (310). The annular limiting groove (2501) is coaxially arranged with the operating lever (200). The limiting piece (342) is embedded in the annular limiting groove (2501). The bearing seat (310) has a third mounting hole (3103) along its radial direction. The connector (341) passes through the third mounting hole (3103) and is connected to the limiting piece (342). The limiting piece (342) is used to restrict the movement of the operating lever (200) along its axial direction.

5. The extension pole of claim 1, wherein, The connecting part (230) is provided with a fourth mounting hole (2301), and a third limiting component (240) is disposed in the fourth mounting hole (2301). The wall surface of the first insertion hole (4211) is provided with a groove (4213). The third limiting component (240) is configured such that when the third limiting component (240) is aligned with the groove (4213), the third limiting component (240) is engaged in the groove (4213).

6. The extension pole of claim 1, wherein, The cross-section of the connecting part (230) is polygonal.

7. The extension pole of claim 1, wherein, The rotating component (420) is fitted with a second bearing (430), and the inner wall of the housing (410) is provided with a third annular step portion (4102). The second bearing (430) is sandwiched between the third annular step portion (4102) and the rotating component (420).

8. The extension pole of claim 1, wherein, The second positioning mechanism (400) further includes a first fixing plate (440) and a second fixing plate (450). The first fixing plate (440) is disposed on the side of the housing (410) near the second end face (12), and the second fixing plate (450) is disposed on the side of the housing (410) near the valve (20).

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