Multifunctional reversing valve

Abstract

The invention relates to the technical field of valve structures, in particular to a multifunctional reversing valve which comprises a valve body and two valve pipes located on the left side and the right side of the valve body, a connecting flange and an adjusting flange are arranged at the two ends of each valve pipe, the connecting flanges are used for being connected with an external pipeline, and the adjusting flanges are used for being rotationally connected with the valve body. The valve pipes are communicated with the valve body through an adjusting flange, the adjusting flange is provided with a pressure plate for blocking the adjusting flange, a crank arm is arranged in the valve body, and the crank arm is connected with the pressure plates on the two valve pipes; by designing the rotatable adjusting flange, the directions of the valve pipe and the connecting flange can be adjusted according to needs, so that the valve can adapt to pipeline requirements in different directions, the installation flexibility is greatly improved, and the flexibility and functionality of the valve structure are improved especially on occasions with limited space or complex pipeline layout.

Description

Technical Field

[0001] The invention relates to the technical field of valve structures, in particular to a multifunctional reversing valve. Background Art

[0002] In modern industrial production and infrastructure construction, valves are one of the key equipment for controlling fluid flow. They are widely used in many fields such as chemical industry, oil and gas, water treatment, energy supply, etc. The opening and closing of the valve is mainly completed by the movable valve disc inside. In the traditional valve structure, the flanges at both ends of the valve body used to connect to the pipeline are fixed in position, that is, the flange and the valve body are made by integrated casting. This leads to the direction and position of the connection between the flange on the valve and the pipeline being fixed, and the position and direction of the flange on the valve cannot be adjusted according to the pipeline transportation direction, which greatly restricts the use of the valve. Summary of the invention

[0003] In order to solve the above technical problems, the present invention provides a multifunctional reversing valve, the specific technical solution adopted by the present invention is: According to a first aspect of the present invention, a multifunctional reversing valve is provided, comprising a valve body and two valve pipes located on the left and right sides of the valve body, each valve pipe is provided with a connecting flange and an adjusting flange at both ends, the connecting flange is used to be connected to an external pipeline, the adjusting flange is used to be rotatably connected to the valve body, and the valve pipe is connected to the valve body through the adjusting flange, a pressure plate for sealing the adjusting flange is provided on the adjusting flange, and a crank arm is provided in the valve body, the crank arm connecting the pressure plates on the two valve pipes; The axis of the connecting flange is relatively inclined to the axis of the adjusting flange, and the rotation axis of the crank arm in the valve body is perpendicular to the axis of the adjusting flange and the horizontal axis of the valve body.

[0004] Furthermore, a buckle cap and a connecting outer edge are provided at the connecting position between the valve body and the adjusting flange. The connecting outer edge is fixed on the valve body. The buckle cap and the connecting outer edge are fastened to each other by bolts. The buckle cap is sleeved on the outer wall of the valve tube. The space between the buckle cap and the connecting outer edge is used to hold the adjusting flange.

[0005] Furthermore, a fixing groove is provided on the buckle cap, and two first sealing rings are arranged in the fixing groove, and the end face shape of each first sealing ring is set to be a wave shape, and the end faces of the two first sealing rings are in sealing contact with each other through the wave shape, one first sealing ring is fixed on the adjustment flange, and the other first sealing ring is fixed in the fixing groove; Wherein, the inner side wall of the fixing groove is set as a slope surface. When the buckle cap and the connecting outer edge are connected, the slope surface generates an extrusion force on the circumferential inner walls of the two first sealing rings in a direction away from the axis of the adjusting flange.

[0006] Furthermore, there is a wavy end surface of the first sealing ring which is densely covered with teeth, and the teeth are distributed in a ring shape around the axis of the first sealing ring, and the two first sealing rings in the fixed groove are meshed with each other through the teeth.

[0007] Furthermore, annular grooves are provided on the end surface of the adjusting flange and the end surface of the connecting outer edge, and a second sealing ring is provided between the two annular grooves. The cross-sectional shape of the second sealing ring is V-shaped, and its opening faces the axis of the adjusting flange.

[0008] Furthermore, a rotating column is inserted into the valve body, one end of the rotating column is fixed on the crank arm, and the other end of the rotating column extends out of the valve body. The rotating column rotates on the valve body, and the crank arm rotates with the axis of the rotating column as the rotating axis; A polygonal limit sleeve is provided on the outer wall of the rotating column outside the valve body, the rotating column rotates in the polygonal limit sleeve, a polygonal sleeve is provided on the polygonal limit sleeve, a handle is provided on the end of the polygonal sleeve away from the valve body, a polygonal ring is provided on the end of the rotating column outside the valve body, the polygonal ring slides in the polygonal sleeve, and the polygonal ring is used in conjunction with the polygonal sleeve, and the polygonal ring and the handle are connected by a first spring.

[0009] Furthermore, the interior of the crank arm is hollow, an opening is arranged in the middle of the pressure plate, the opening is communicated with the interior of the crank arm, a piston is slidably arranged in the crank arm, and the piston is connected to the inner wall of the crank arm through a second spring.

[0010] Furthermore, the interior of the rotating column is hollow, and the rotating column and the crank arm are connected to each other, and an air hole is provided in the middle of the handle, and the air hole is connected to the rotating column.

[0011] The beneficial effects of the present invention are: By designing a rotatable adjusting flange, the valve pipe and the connecting flange can be adjusted in direction as needed, so that the valve can adapt to the pipeline requirements in different directions, greatly increasing the flexibility of installation, especially in situations where space is limited or the pipeline layout is complex, improving the flexibility and functionality of the valve structure; the adjusting flange rotates around its own axis to ensure that the surface of the adjusting flange remains unchanged, so that the pressure plate can always be aligned with the adjusting flange, and effective sealing can be achieved regardless of the angle position of the adjusting flange, thereby ensuring the sealing performance of the valve; in general, the design of this multifunctional reversing valve overcomes the limitations of traditional valves in installation direction, improves the practicability, reliability and economy of the valve, and is of great significance for improving industrial process management and improving equipment operation efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0013] Figure 1 It is a schematic diagram of the structure of the present invention; Figure 2 yes Figure 1 Schematic diagram of the cross-section structure; Figure 3 yes Figure 2 Schematic diagram of the structure of the middle valve pipe; Figure 4 yes Figure 3 A schematic diagram of the partial structure of the middle buckle cap and the first sealing ring; Figure 5 yes Figure 3 A schematic diagram of the partial structure of the second sealing ring; Figure 6 is a schematic structural diagram of a switch structure in an embodiment of the present invention; Figure 7 yes Figure 6 Schematic diagram of the cross-sectional structure from another perspective.

[0014] Reference numerals: 1. Valve body; 2. Valve pipe; 3. Connecting flange; 4. Adjusting flange; 5. Pressure plate; 6. Crank arm; 7. Buckle cap; 8. Connecting outer edge; 9. Fixing groove; 10. First sealing ring; 11. Slope; 12. Second sealing ring; 13. Rotating column; 14. Polygonal limit sleeve; 15. Polygonal sliding sleeve; 16. Handle; 17. Polygonal ring; 18. First spring; 19. Piston; 20. Second spring. DETAILED DESCRIPTION

[0015] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0016] In the description of the present invention, it should be noted that the orientations or positional relationships indicated by “center”, “up”, “down”, “left”, “right”, “vertical”, “horizontal”, “inside” and “outside”, etc., are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0017] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. This embodiment is written in a progressive manner.

[0018] like Figures 1 to 7 As shown, a multifunctional reversing valve of the present invention comprises a valve body 1 and two valve pipes 2 located on the left and right sides of the valve body 1, and both ends of each valve pipe 2 are provided with a connecting flange 3 and an adjusting flange 4, the connecting flange 3 is used to connect with an external pipeline, the adjusting flange 4 is used to be rotatably connected with the valve body 1, and the valve pipe 2 is connected with the valve body 1 through the adjusting flange 4, and a pressure plate 5 for blocking the adjusting flange 4 is provided on the adjusting flange 4, and a crank arm 6 is provided in the valve body 1, and the crank arm 6 connects the pressure plates 5 on the two valve pipes 2; The axis of the connecting flange 3 is relatively inclined to the axis of the adjusting flange 4 , and the rotation axis of the crank arm 6 in the valve body 1 is perpendicular to both the axis of the adjusting flange 4 and the horizontal axis of the valve body 1 .

[0019] In detail, the valve can be connected to the external pipeline through the two connecting flanges 3 on the two valve pipes 2. Since the adjusting flange 4 on the valve pipe 2 can rotate on the valve body 1, and the axis of the connecting flange 3 is relatively inclined to the axis of the adjusting flange 4, when the adjusting flange 4 rotates on the valve body 1, the direction of the connecting flange 3 changes, so that the direction of the connecting flange 3 can be adjusted. That is, in this way, the valve can adapt to the pipeline requirements in different directions.

[0020] In actual use, the two adjusting flanges 4 are parallel to each other, and the angle between the connecting flange 3 and the adjusting flange 4 can be set to 45°, so that when the adjusting flange 4 rotates, the connecting flange 3 can achieve 90° angle direction adjustment. Of course, when the axes of the two connecting flanges 3 are collinear, the valve can be used on a straight pipeline, so that it can be suitable for ordinary pipeline structure. Since the adjusting flange 4 rotates around its own axis, the height position and angle of the connecting flange 3 in the vertical direction and the position and angle in the horizontal direction will change.

[0021] It should be noted that since the adjusting flange 4 rotates around its own axis, the surface where the adjusting flange 4 is located will not change, that is, the central opening position and direction of the adjusting flange 4 will not change. In this way, the pressure plate 5 can be used to cover and seal the adjusting flange 4 at any angle, thereby avoiding the phenomenon that the pressure plate 5 cannot be aligned with the adjusting flange 4 when the valve tube 2, the connecting flange 3 and the adjusting flange 4 are rotated. The crank arm 6 can connect the two pressure plates 5, and the rotation axis of the crank arm 6 is horizontal. When the crank arm 6 rotates, the crank arm 6 can drive the pressure plate 5 to approach or move away from the adjusting flange 4, thereby controlling the opening and closing of the valve. The surface where the movement trajectory of the pressure plate 5 is located coincides with the axis of the adjusting flange 4, and the surface where the movement trajectory of the pressure plate 5 is located is perpendicular to the surface where the adjusting flange 4 is located.

[0022] By designing a rotatable adjusting flange 4, the directions of the valve pipe 2 and the connecting flange 3 can be adjusted as needed, so that the valve can adapt to the pipeline requirements in different directions, which greatly increases the flexibility of installation, especially in occasions with limited space or complex pipeline layout, and improves the flexibility and functionality of the valve structure; the adjusting flange 4 rotates around its own axis to ensure that the surface of the adjusting flange 4 remains unchanged, so that the pressure plate 5 can always be aligned with the adjusting flange 4, and effective sealing can be achieved regardless of the angle position of the adjusting flange 4, thereby ensuring the sealing performance of the valve; in general, the design of this multifunctional reversing valve overcomes the limitations of traditional valves in installation direction, improves the practicability, reliability and economy of the valve, and is of great significance for improving industrial process management and improving equipment operation efficiency.

[0023] Furthermore, a buckle cap 7 and a connecting outer edge 8 are provided at the connecting position between the valve body 1 and the adjusting flange 4. The connecting outer edge 8 is fixed on the valve body 1. The buckle cap 7 and the connecting outer edge 8 are fastened to each other by bolts. The buckle cap 7 is sleeved on the outer wall of the valve tube 2. The space between the buckle cap 7 and the connecting outer edge 8 is used to hold the adjusting flange 4.

[0024] In detail, the buckle cap 7 is slidably mounted on the valve tube 2, and the buckle cap 7 squeezes the adjusting flange 4 onto the connecting outer edge 8, thereby realizing a rotational connection relationship between the valve body 1 and the valve tube 2 through the buckle cap 7 and the connecting outer edge 8. When the valve tube 2 rotates, the adjusting flange 4 can rotate between the buckle cap 7 and the connecting outer edge 8. This structural method can facilitate assembly and processing.

[0025] Furthermore, a fixing groove 9 is provided on the buckle cap 7, and two first sealing rings 10 are arranged in the fixing groove 9. The end face shape of each first sealing ring 10 is set to be wavy. The end faces of the two first sealing rings 10 are sealed and contacted with each other through the wavy shape. One first sealing ring 10 is fixed on the adjusting flange 4, and the other first sealing ring 10 is fixed in the fixing groove 9. The inner side wall of the fixing groove 9 is configured as a slope 11 . When the buckle cap 7 and the connecting outer edge 8 are butted against each other, the slope 11 generates an extrusion force on the circumferential inner walls of the two first sealing rings 10 in a direction away from the axis of the adjusting flange 4 .

[0026] In detail, the two first sealing rings 10 are used to perform sealing connection processing on the buckle cap 7 and the adjusting flange 4, so as to prevent the fluid in the valve body 1 from leaking through the connection position between the valve body 1 and the valve tube 2, and the wavy end face design can improve the sealing between the two first sealing rings 10, and the fixing groove 9 is used to provide an installation position for the two first sealing rings 10.

[0027] During normal use, the fluid enters the valve body 1. At this time, there is also liquid pressure on the end face of the adjusting flange 4 away from the valve tube 2. The liquid pressure squeezes the two first sealing rings 10 through the adjusting flange 4, so that the two first sealing rings 10 fit tightly and the sealing effect is improved. At the same time, since the slope 11 generates an extrusion force on the circumferential inner walls of the two first sealing rings 10 in the direction away from the axis of the adjusting flange 4, an inclined external support extrusion force can be added to the two first sealing rings 10 on the basis of the mutual vertical extrusion of the two first sealing rings 10, thereby improving the extrusion sealing effect of the wavy area between the two first sealing rings 10.

[0028] It can be seen here that one end face of the first sealing ring 10 is a plane and is used to be fixed on the buckle cap 7 or the adjusting flange 4, and the other end face of the first sealing ring 10 is a wavy surface.

[0029] Furthermore, there is a wavy end surface of the first sealing ring 10 densely covered with teeth, and the teeth are distributed in a ring shape around the axis of the first sealing ring 10, and the two first sealing rings 10 in the fixing groove 9 are meshed with each other through the teeth.

[0030] In detail, by providing teeth on the first sealing ring 10 and utilizing the teeth to make the two first sealing rings 10 mesh with each other, the position of the adjusting flange 4 can be limited, thereby limiting the positions of the valve pipe 2 and the connecting flange 3 to prevent them from rotating at will. When the valve pipe 2, the connecting flange 3 and the adjusting flange 4 need to be rotated, it is only necessary to push the valve pipe 2 a small distance into the valve body 1 to separate the teeth on the two first sealing rings 10 from each other, and then rotate the valve pipe 2.

[0031] Furthermore, annular grooves are provided on the end faces of the adjusting flange 4 and the connecting outer edge 8 , and a second sealing ring 12 is provided between the two annular grooves. The second sealing ring 12 has a V-shaped cross-section and its opening faces the axis of the adjusting flange 4 .

[0032] In detail, by providing the second sealing ring 12, the adjusting flange 4 and the connecting outer edge 8 can be conveniently sealed, thereby further improving the sealing effect. Since the second sealing ring 12 is V-shaped, when the liquid pressure acts on the second sealing ring 12, the pressure will cause the second sealing ring 12 to be in an open state, so that the second sealing ring 12 and the adjusting flange 4 and the connecting outer edge 8 are more closely fitted, thereby preventing leakage. The provision of the second sealing ring 12 can also provide auxiliary elastic force for the adjusting flange 4, so that the two first sealing rings 10 are tightly attached to each other. When the valve tube 2 moves toward the inside of the valve body 1, the second sealing ring 12 is elastically deformed, thereby providing space for the separation of the two first sealing rings 10.

[0033] Furthermore, a rotating column 13 is inserted into the valve body 1, one end of the rotating column 13 is fixed on the crank arm 6, and the other end of the rotating column 13 extends out of the valve body 1. The rotating column 13 rotates on the valve body 1, and the crank arm 6 rotates with the axis of the rotating column 13 as the rotating axis; A polygonal limit sleeve 14 is sleeved on the outer wall of the rotating column 13 outside the valve body 1, and the rotating column 13 rotates in the polygonal limit sleeve 14. A polygonal sleeve 15 is slidably sleeved on the polygonal limit sleeve 14, and a handle 16 is provided at the end of the polygonal sleeve 15 away from the valve body 1. A polygonal ring 17 is provided at the end of the rotating column 13 outside the valve body 1, and the polygonal ring 17 is slidably located in the polygonal sleeve 15, and the polygonal ring 17 is used in conjunction with the polygonal sleeve 15, and the polygonal ring 17 and the handle 16 are connected by a first spring 18.

[0034] In detail, in the natural state, the first spring 18 provides elastic force for the handle 16 and the polygonal sleeve 15, so that the polygonal sleeve 15 is sleeved on the polygonal limiting sleeve 14. At this time, the polygonal limiting sleeve 14 limits the polygonal ring 17 through the polygonal sleeve 15, and the polygonal ring 17 cannot rotate freely, that is, the rotating column 13 and the crank arm 6 cannot rotate freely, and the positions of the two pressure plates 5 are locked. When the valve needs to be opened and closed, the handle 16 is pulled to separate the polygonal sleeve 15 from the polygonal limiting sleeve 14, and then the handle 16 is turned, and the polygonal sleeve 15 smoothly drives the polygonal ring 17 to rotate, thereby rotating the rotating column 13, the crank arm 6 and the pressure plate 5. When the position adjustment of the pressure plate 5 is completed, the polygonal sleeve 15 is re-sleeved on the polygonal limiting sleeve 14 with the help of the polygonal ring 17, thereby locking the position of the pressure plate 5 again.

[0035] Furthermore, the crank arm 6 is hollow inside, an opening is set in the middle of the pressure plate 5, the opening is connected to the inside of the crank arm 6, a piston 19 is slidably set inside the crank arm 6, and the piston 19 is connected to the inner wall of the crank arm 6 through a second spring 20.

[0036] In detail, when the pressure plate 5 closes the adjusting flange 4, the fluid will enter the crank arm 6 through the opening on the pressure plate 5 due to inertia. At this time, the fluid produces an impact force on the piston 19 and pushes the second spring 20 to compress. The second spring 20 can buffer the fluid, thereby preventing the fluid impact force from damaging the pressure plate 5.

[0037] Furthermore, the rotating column 13 is hollow inside, and the rotating column 13 is communicated with the crank arm 6 . An air hole is provided in the middle of the handle 16 , and the air hole is communicated with the rotating column 13 .

[0038] In detail, when the piston 19 in the crank arm 6 moves, the gas in the crank arm 6 can be discharged through the air holes on the rotating column 13 and the handle 16, thereby realizing normal air circulation. If the crank arm 6 is not connected to the outside world, the movement of the piston 19 will cause the internal space of the crank arm 6 to change, and the air inside the crank arm 6 will be squeezed. After long-term use, it is impossible to ensure that the amount of air between the two pistons 19 inside the crank arm 6 remains unchanged. Therefore, in order to avoid the decrease in the buffering effect of the piston 19 caused by the change in the air amount, it is necessary to use the rotating column 13 and the air holes to connect the crank arm 6 with the outside world.

[0039] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A multifunctional reversing valve, characterized in that: It comprises a valve body (1) and two valve pipes (2) located on the left and right sides of the valve body (1), each valve pipe (2) is provided with a connecting flange (3) and an adjusting flange (4) at both ends, the connecting flange (3) is used to be connected to an external pipeline, the adjusting flange (4) is used to be rotatably connected to the valve body (1), and the valve pipe (2) is connected to the valve body (1) through the adjusting flange (4), and a pressure plate (5) for sealing the adjusting flange (4) is provided on the adjusting flange (4), and a crank arm (6) is provided inside the valve body (1), and the crank arm (6) connects the pressure plates (5) on the two valve pipes (2); The axis of the connecting flange (3) and the axis of the adjusting flange (4) are relatively inclined, and the rotation axis of the crank arm (6) in the valve body (1) is perpendicular to both the axis of the adjusting flange (4) and the horizontal axis of the valve body (1).

2. A multifunctional reversing valve according to claim 1, characterized in that: A buckle cap (7) and a connecting outer edge (8) are provided at the connection position between the valve body (1) and the adjusting flange (4); the connecting outer edge (8) is fixed on the valve body (1); the buckle cap (7) and the connecting outer edge (8) are fastened together by bolts; the buckle cap (7) is sleeved on the outer wall of the valve tube (2); and the space between the buckle cap (7) and the connecting outer edge (8) is used to hold the adjusting flange (4).

3. A multifunctional reversing valve according to claim 2, characterized in that: The buckle cap (7) is provided with a fixing groove (9), and two first sealing rings (10) are arranged in the fixing groove (9). The end surface shape of each first sealing ring (10) is set to be a wave shape. The end surfaces of the two first sealing rings (10) are in sealing contact with each other through the wave shape. One first sealing ring (10) is fixed on the adjustment flange (4), and the other first sealing ring (10) is fixed in the fixing groove (9); The inner side wall of the fixing groove (9) is configured as a slope surface (11), and when the buckle cap (7) and the connecting outer edge (8) are butted against each other, the slope surface (11) generates a squeezing force on the circumferential inner walls of the two first sealing rings (10) in a direction away from the axis of the adjusting flange (4).

4. A multifunctional reversing valve according to claim 3, characterized in that: The first sealing ring (10) has a wavy end surface densely covered with teeth, and the teeth are distributed in a ring shape around the axis of the first sealing ring (10), and the two first sealing rings (10) in the fixed groove (9) are meshed with each other through the teeth.

5. A multifunctional reversing valve according to claim 4, characterized in that: An annular groove is provided on the end surface of the adjusting flange (4) and the end surface of the connecting outer edge (8), and a second sealing ring (12) is provided between the two annular grooves. The cross-sectional shape of the second sealing ring (12) is V-shaped, and its opening faces the axis of the adjusting flange (4).

6. A multifunctional reversing valve according to claim 5, characterized in that: The valve body (1) is penetrated by a rotating column (13), one end of the rotating column (13) is fixed on the crank arm (6), and the other end of the rotating column (13) extends outside the valve body (1). The rotating column (13) rotates on the valve body (1), and the crank arm (6) rotates with the axis of the rotating column (13) as the rotating axis. A polygonal limiting sleeve (14) is sleeved on the outer wall of the rotating column (13) outside the valve body (1), the rotating column (13) rotates in the polygonal limiting sleeve (14), a polygonal sliding sleeve (15) is slidably sleeved on the polygonal limiting sleeve (14), a handle (16) is provided at the end of the polygonal sliding sleeve (15) away from the valve body (1), a polygonal ring (17) is provided at the end of the rotating column (13) outside the valve body (1), the polygonal ring (17) is slidably located in the polygonal sliding sleeve (15), and the polygonal ring (17) and the polygonal sliding sleeve (15) are used in conjunction with each other, and the polygonal ring (17) and the handle (16) are connected via a first spring (18).

7. A multifunctional reversing valve according to claim 6, characterized in that: The crank arm (6) is hollow inside, an opening is arranged in the middle of the pressure plate (5), the opening is communicated with the inside of the crank arm (6), a piston (19) is slidably arranged inside the crank arm (6), and the piston (19) is connected to the inner wall of the crank arm (6) via a second spring (20).

8. A multifunctional reversing valve according to claim 7, characterized in that: The rotating column (13) is hollow inside, and the rotating column (13) and the crank arm (6) are connected to each other. An air hole is provided in the middle of the handle (16), and the air hole is connected to the rotating column (13).

Images