Supporting rod for stabilizing blades of wind direction calibrator

Abstract

The invention relates to the technical field of wind direction calibrators, in particular to a supporting rod for stabilizing blades of a wind direction calibrator, which comprises an outer supporting rod, an inner supporting rod and an inner supporting rod, a deep hole is formed in the outer supporting rod; the telescopic assembly can be inserted into the deep hole in the outer supporting rod; the telescopic assembly can stretch out and draw back in the axial direction of the deep hole, and therefore the overall height of the supporting rod can be adjusted. A threaded hole is formed in the center of the coil spring seat and used for being connected with a thread and a bolt at the top end of the telescopic assembly. The beneficial effects of the invention are that the clamping jaw and the plane structure and the V-shaped groove at the jaw opening of the clamping jaw enable the clamping jaw to adapt to and firmly clamp wind direction test blades of different shapes, and through the design of the inclined grooves formed in the two sides of the clamping jaw seat and the inclined structure of the clamping jaw, it is ensured that the clamping jaw can accurately slide in the clamping jaw seat. And the stability of the whole clamping process is improved.

Description

Technical Field

[0001] The invention relates to the field of wind direction calibrators, in particular to a support rod for stabilizing blades of a wind direction calibrator. Background Art

[0002] The wind direction calibrator is an instrument used to detect whether the wind direction test device is accurate. Its working principle is to use its internal motor to drive the seat of the wind direction test blade to rotate, so that the wind direction test blade and the seat produce a relative rotation angle, and then use computer software to read the rotation angle of the wind direction test blade seat and the motor for comparison, so as to determine whether the angle detection of the wind direction test device is accurate and whether it can meet the test accuracy and usage requirements.

[0003] During motor and wind direction tests, the blades need to be firmly fixed to prevent them from rotating synchronously with the motor and blade holder. Given the variety of blade types currently used for wind direction tests, different clamping heads must be used to accommodate and secure different blade types, which is inconvenient. Summary of the Invention

[0004] Therefore, the technical problem to be solved by the present invention is that the types of blades currently used for wind direction testing are diverse, so different clamping heads must be replaced to adapt to and stabilize different types of blades, which is inconvenient to use.

[0005] The above technical problems are solved by the following technical solutions: The present invention proposes a support rod for stabilizing blades of a wind direction calibrator, which includes an outer support rod, a thread is provided at the bottom end of which is used to connect with the wind direction calibrator through the thread; a deep hole is provided inside the outer support rod; a telescopic assembly can be inserted into the deep hole inside the outer support rod; wherein the telescopic assembly can be extended and retracted along the axial direction of the deep hole, thereby realizing the adjustment of the overall height of the support rod; a force-applying member, which is provided on the telescopic assembly; a pair of clamps, which are connected to the force-applying member, and the force-applying member applies a force to the pair of clamps to move them closer to each other.

[0006] A coil spring seat, the center of which is provided with a threaded hole for connecting with the thread and bolt at the top of the telescopic assembly; a coil spring, which is arranged inside the coil spring seat to provide elastic force for the clamping jaws; a clamping jaw seat, which is used to guide the sliding movement of the clamping jaws and is fixed to the coil spring seat by bolts; a pair of clamping jaws.

[0007] In a preferred embodiment of the support rod for stabilizing blades of a wind direction calibrator described in the present invention: a square groove is further provided at the upper end of the coil spring seat for limiting the clamping claw seat to prevent it from rotating when subjected to force.

[0008] In a preferred embodiment of the support rod for stabilizing the blades of a wind direction calibrator described in the present invention: a long groove is provided at the lower end of the clamping jaw, and the two clamping jaws are diagonally distributed; wherein, a shift fork is provided on the surface of the coil spring, and two symmetrically distributed shift rods are provided on the upper end of the shift fork; when the shift fork rotates clockwise, the shift rod on the shift fork slides in the long groove of the clamping jaw, thereby shifting the two clamping jaws to open at the same time.

[0009] In a preferred embodiment of the support rod for stabilizing the blades of a wind direction calibrator described in the present invention: oblique grooves that are narrow at the top and wide at the bottom are provided on both sides of the clamping jaw seat, and the part where the clamping jaw contacts the clamping jaw seat is also provided with an inclined structure to ensure that the clamping jaw moves in the oblique groove of the clamping jaw seat.

[0010] In a preferred embodiment of the support rod for stabilizing blades of a wind direction calibrator according to the present invention, the outer ring of the shift fork is provided with striped patterns to facilitate manual rotation.

[0011] In a preferred embodiment of the support rod for stabilizing blades of a wind direction calibrator according to the present invention, there are two clamping jaws, the jaw opening of each clamping jaw is a planar structure as a whole, and a V-shaped groove is provided in the middle.

[0012] In a preferred embodiment of the support rod for stabilizing the blades of a wind direction calibrator described in the present invention: the telescopic assembly includes a first telescopic rod, which is provided with a notch; a spring buckle corresponding to the notch on the first telescopic rod; a butterfly spring for providing elastic force to enable the spring buckle to clamp the notch on the first telescopic rod, thereby fixing the height of the first telescopic rod; the outer support rod is provided with a square notch, and the spring buckle is used in conjunction with the square notch to insert into the notch on the first telescopic rod and realize the limiting function.

[0013] In a preferred embodiment of the support rod for stabilizing blades of a wind direction calibrator according to the present invention: a cylindrical pin is installed on the first telescopic rod to assist the spring buckle in lifting or lowering under the action of the butterfly spring.

[0014] In a preferred embodiment of the support rod for stabilizing blades in a wind direction calibrator according to the present invention, the first telescopic rod has an internal bore; a compression spring and the second telescopic rod are mounted in this bore. The upper edge of the first telescopic rod has internal threads for connection with a nut. The nut has a hexagonal top for easy installation and tightening. The nut also has a stepped hole that mates with the stepped shaft of the second telescopic rod to prevent the second rod from detaching upward from the first.

[0015] In a preferred embodiment of the support rod for stabilizing the blades of the wind direction calibrator described in the present invention: a plurality of movable clamping rods are installed on the opposite sides of a pair of said clamping jaws. When the said clamping jaws clamp the blades, the plurality of movable clamping rods automatically shrink and can clamp and support the wind direction test blades; a force spring is sleeved on the clamping rods.

[0016] In a preferred embodiment of the support rod for stabilizing the blades of a wind direction calibrator described in the present invention: a torque seat is arranged on one side of a pair of jaws away from each other, a cavity threadedly connected to the torque seat is provided inside the jaw, the cavity is filled with a medium, and a hollow channel connected to the medium is provided inside the movable clamping rod.

[0017] The beneficial effects of this invention are that the flat structure and V-grooves of the jaws and jaw openings enable them to adapt to and securely clamp wind direction test blades of various shapes. The inclined grooves on both sides of the jaw base and the tilted structure of the jaws ensure that the jaws can slide accurately within the jaw base, improving the stability of the entire clamping process.

[0018] The multiple movable clamping bars all work independently, so even if some areas are not in contact with the blade, they still remain in place. This allows them to accommodate the most diverse blade shapes, fitting snugly to the surface and providing a secure hold.

[0019] A hollow channel connected to the medium is also opened inside the movable clamping rod, which allows the medium to flow freely according to local pressure differences, realizes the function of multi-point independent adjustment, and greatly improves the stability of the overall clamping.

[0020] The axial movement of the telescopic assembly within the deep hole inside the outer support rod allows for flexible adjustment of the overall support rod height, greatly improving the adaptability of the equipment. The fixed height of the telescopic assembly ensures the stability of the support rod at different heights, preventing loosening or falling due to external factors.

[0021] The first telescopic rod is equipped with a compression spring and a second telescopic rod, which can achieve additional small-range height adjustment. This multi-level height adjustment mechanism further improves the accuracy and adaptability of the device, and is particularly suitable for scenarios that require fine adjustment. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings of the embodiments of the present invention. Obviously, the drawings described below only relate to some embodiments of the present invention and are not intended to limit the present invention. Among them:

[0023] Figure 1 Shows an overall schematic diagram of a support rod for stabilizing blades of a wind direction calibrator;

[0024] Figure 2 A perspective view of a support rod for stabilizing blades of a wind direction calibrator is shown;

[0025] Figure 3 An exploded schematic diagram of a support rod used for stabilizing blades of a wind direction calibrator is shown;

[0026] Figure 4 An exploded schematic diagram of a coil spring seat, clamping claws, etc., used for a support rod of a wind direction calibrator to stabilize blades is shown;

[0027] Figure 5 A diagram showing the opening or closing of the clamping jaws of a support rod for stabilizing a blade of a wind direction calibrator is shown;

[0028] Figure 6 Shows the jaws of a support rod for a wind vane stabilization blade, front view with the blades open.

[0029] Figure 7 A three-dimensional view of a movable clamping rod for a support rod used to stabilize the blades of a wind direction calibrator is shown.

[0030] Figure 8 Shows a top view of a movable clamping rod used for supporting the blades of a wind direction calibrator. DETAILED DESCRIPTION

[0031] In order to enable those skilled in the art to better understand the present invention, the present invention is further described in detail below with reference to specific embodiments and the accompanying drawings.

[0032] The terms used in the present invention are those commonly used in the art in view of the functions of the present invention, but these terms may vary according to the intentions of those skilled in the art, precedents, or new technologies in the art. In addition, specific terms may be selected by the applicant, and in such cases, their detailed meanings will be described in the detailed description of the present invention. Therefore, the terms used in the specification should not be understood as simple names, but rather as the meanings of the terms and the overall description of the present invention.

[0033] Reference Figure 1-2 and Figure 4 This embodiment provides a support rod for stabilizing blades of a wind direction calibrator, comprising an outer support rod 1 having a threaded bottom end for connection to a wind direction calibrator 2 via the threaded connection; a deep hole defined within the outer support rod 1; a telescopic assembly 3 capable of being inserted into the deep hole within the outer support rod 1; wherein the telescopic assembly 3 is capable of extending and retracting along the axial direction of the deep hole, thereby adjusting the overall height of the support rod; a force-applying member disposed on the telescopic assembly 3; and a pair of clamping jaws 43 connected to the force-applying member, which applies a force to the pair of clamping jaws 43 to move them closer together.

[0034] The coil spring seat 4 has a threaded hole in its center for connecting with the thread and bolt 41 at the top of the telescopic component 3; the coil spring 42 is arranged inside the coil spring seat 4 to provide elastic force for the clamping jaw 43; the clamping jaw seat 44 is used to guide the sliding movement of the clamping jaw 43 and is fixed to the coil spring seat 4 by the bolt 41; a pair of clamping jaws 43.

[0035] In this embodiment, the support rod consists of an outer support rod 1 and a telescopic assembly 3. The outer support rod 1 has threads at its base, which connect to the wind direction calibrator 2, ensuring a secure connection between the support rod and the device. A deep hole is located within the outer support rod 1, providing space for the telescopic assembly 3 to be inserted and moved axially. This not only simplifies height adjustment of the support rod but also ensures stability at varying heights.

[0036] The telescopic assembly 3 can freely extend and retract in the deep hole inside the outer support rod 1, thereby realizing flexible adjustment of the overall height of the support rod.

[0037] The coil spring 42 is disposed inside the coil spring seat 4, and its main function is to provide elastic force for the clamping jaws 43. When the clamping jaws 43 try to clamp the blade, the coil spring 42 will exert a force in the opposite direction, ensuring that the clamping jaws 43 can closely fit the different shapes of the blade, thereby preventing loosening or falling off due to external factors.

[0038] The jaw base 44 guides the sliding movement of the jaws 43 and is secured to the coil spring base 4 via bolts 41. This structure ensures both smooth sliding of the jaws 43 and the stability of the entire clamping device. Specifically, the jaw base 44 guides the pair of jaws 43 to accurately approach the blade and clamp it with appropriate force. This reduces unnecessary friction between the jaws 43 and the blade, while improving clamping efficiency.

[0039] The outer support rod 1 includes a vertical end and a horizontal end. The horizontal end is connected to the wind direction calibrator 2 through a bolt, and the vertical end is vertically connected to the horizontal end through a thread.

[0040] refer to Figure 3-6In some embodiments, a square groove is further provided at the upper end of the coil spring seat 4 to limit the position of the clamping jaw seat 44 and prevent it from rotating when subjected to force. A long groove 431 is provided at the lower end of the clamping jaw 43, and the two clamping jaws 43 are diagonally distributed. Two symmetrically distributed shift rods 422 are provided at the upper end of the shift fork 421; when the shift fork 421 rotates clockwise, the shift rod 422 on the shift fork 421 slides in the long groove 431 of the clamping jaw 43, thereby shifting the two clamping jaws 43 to open simultaneously. Oblique grooves that are narrow at the top and wide at the bottom are provided on both sides of the clamping jaw seat 44, and the part where the clamping jaw 43 contacts the clamping jaw seat 44 is also provided with an inclined structure to ensure that the clamping jaw 43 moves within the oblique groove of the clamping jaw seat 44. The outer ring of the shift fork 421 is provided with striped patterns to facilitate manual rotation. There are two clamping jaws 43 . The jaw opening of each clamping jaw 43 is a flat structure as a whole, with a V-shaped groove 432 provided in the middle. The clamping jaws 43 use the elastic force of the coil spring 42 to achieve automatic clamping.

[0041] In this embodiment, the upper end of the coil spring seat 4 is provided with a square groove that serves to position the jaw seat 44 and prevent unwanted rotation when subjected to force, ensuring stability and precision throughout the clamping process. Furthermore, the lower ends of the jaws 43 are provided with elongated grooves 431, with the two jaws 43 positioned diagonally to enhance clamping balance. The upper end of the shift fork 421 is provided with two symmetrically spaced levers 422. When the shift fork 421 is rotated clockwise, the levers 422 slide within the elongated grooves 431 of the jaws 43, pushing both jaws 43 to open simultaneously, facilitating the placement or removal of objects.

[0042] To ensure smooth movement of the clamping jaws 43 within the clamping jaw seat 44, the clamping jaw seat 44 has beveled grooves that are narrow at the top and wide at the bottom on both sides. Correspondingly, the portion of the clamping jaw 43 that contacts the clamping jaw seat 44 is also provided with an inclined structure. This not only helps to reduce friction but also ensures that the clamping jaw 43 can move accurately along the beveled groove, improving operational stability. The outer ring of the shift fork 421 is provided with striped patterns, which increase friction during manual rotation and facilitate user control. The jaw opening of each clamping jaw 43 adopts an integral flat structure and is provided with a V-shaped groove 432 in the middle. (For thinner blades, the flat portion can be used for clamping; for blades with more complex shapes, the position of the clamping jaw 43 can be adjusted so that part of the object enters the V-shaped groove 432 for better support and fixation.) This not only enhances the adaptability of the clamping jaw 43 to objects of different shapes, but also utilizes the elastic force provided by the coil spring 42 to achieve an automatic clamping function.

[0043] refer to Figure 1-2In one embodiment provided in the present application, the telescopic assembly 3 includes a first telescopic rod 31, a notch 32 is provided on the first telescopic rod 31, the upper end of the notch 32 is flat, and the lower end is inclined; a spring buckle 33, corresponding to the notch 32 on the first telescopic rod 31, its upper end is flat, and the lower end is inclined; a butterfly spring 34, used to provide elastic force to make the spring buckle 33 clamp the notch 32 on the first telescopic rod 31, so as to fix the height of the first telescopic rod 31; the outer support rod 1 is provided with a square notch, and the spring buckle 33 is used in conjunction with the square notch to insert into the notch 32 on the first telescopic rod 31 and realize the limiting function.

[0044] In this embodiment, when the height of the first telescopic rod 31 needs to be adjusted, the spring buckle 33 is manually pressed down to lift its upper end, so that the first telescopic rod 31 can be smoothly inserted into the square notch of the outer support rod 1, and the spring buckle 33 is released after reaching the predetermined position. The spring buckle 33 is automatically snapped into the notch 32 of the first telescopic rod 31 under the action of the butterfly spring 34 and the cylindrical pin 35, completing the height adjustment and fixing process.

[0045] The contact surface between the first telescopic rod 31 and the spring buckle 33 is an inclined surface, so that when the first telescopic rod 31 needs to be pulled out, the first telescopic rod 31 can be directly pulled upwards, and the locking state of the spring buckle 33 on the first telescopic rod 31 can be easily released by utilizing the effect of the inclined surface.

[0046] The arrangement of the butterfly spring 34 ensures that the spring buckle 33 can maintain effective locking of the first telescopic rod 31 in the absence of external pressure, while ensuring the operational convenience and stability of the entire device.

[0047] refer to Figure 3 As an optional embodiment, the first telescopic rod 31 is provided with an inner hole to achieve a wide range of height adjustment; a compression spring 311 and a second telescopic rod 312 are installed in the inner hole to achieve additional, smaller range of height adjustment. The upper edge of the first telescopic rod 31 is provided with internal threads, which are used to connect with a nut 313. The upper end of the nut 313 is hexagonal in shape, facilitating installation and tightening operations. The nut 313 is provided with a stepped hole, which mates with the stepped shaft of the second telescopic rod 312 to prevent the second telescopic rod 312 from detaching upward from the first telescopic rod 31.

[0048] In this embodiment, a compression spring 311 is located within the hole of the first telescopic rod 31. When downward pressure is applied to the second telescopic rod 312, the compression spring 311 is compressed and shortened. When the external force is released, the compression spring 311 extends due to its own elastic force, pushing the second telescopic rod 312 upward, achieving height adjustment within a narrow range. The combination of the second telescopic rod 312, the compression spring 311, and the first telescopic rod 31 provides stable and precise height adjustment within a narrow range, meeting the height requirements of the blades during wind direction testing.

[0049] refer to Figure 7-8 In one embodiment provided in the present application, a plurality of movable clamping rods 5 are installed on opposite sides of two clamping jaws 43. When the clamping jaws 43 clamp the blade, the plurality of movable clamping rods 5 automatically shrink and can clamp and support the wind direction test blade; a force spring is sleeved on the clamping rod.

[0050] In this embodiment, when the two clamping jaws 43 approach each other, if a wind direction test blade is encountered, the movable clamping rods 5 can be adjusted according to the shape of the object.

[0051] Specifically, as the clamping jaws 43 begin to close and contact the blade, the movable clamping bars 5 directly in contact with the blade retract backward due to resistance from the blade. At the same time, because all movable clamping bars 5 operate independently, they remain in place even when some areas are not in contact with the blade. This allows them to accommodate a wide variety of blade shapes, tightly fitting to their surfaces and providing a secure hold.

[0052] To ensure that the movable clamping rod 5 effectively and evenly applies pressure to the blades and quickly returns to its initial position after pressure is released, each movable clamping rod 5 is fitted with a force spring. One end of this force spring is fixed to the clamping jaw 43, and the other end is connected to the movable clamping rod 5. When the movable clamping rod 5 contracts inward due to the presence of the blades, it actually compresses the force spring. Once the external force disappears (for example, when the blades are removed), the force spring, using its elastic properties, pushes the movable clamping rod 5 back to its original position, ready for the next operation.

[0053] This structure enables the clamping device to automatically adapt to the blade shape. This feature greatly improves clamping efficiency, reduces the need for human intervention, and reduces the risk of blade damage due to misoperation.

[0054] More importantly, during the clamping process, because each movable clamping lever 5 can operate independently and is provided with a continuous and stable pushing force by the force spring, a balanced pressure distribution is ensured across the entire blade surface. This balance not only helps to improve the clamping strength but also avoids the possibility of blade damage caused by excessive local pressure.

[0055] refer to Figure 7-8 In one embodiment provided in the present application, a torque seat 51 is provided on one side of the two clamping jaws 43 that are away from each other. A cavity threadedly connected to the torque seat 51 is provided inside the clamping jaw 43, and the cavity is filled with a medium. A hollow channel connected to the medium is provided inside the movable clamping rod 5.

[0056] In this embodiment, the medium filled within the cavity flows when subjected to external pressure, thereby dynamically adjusting the distribution ratio between the movable clamping rods 5. When the torque seat 51 rotates, it applies pressure to the medium, causing it to flow toward the movable clamping rods 5, further providing clamping force for the movable clamping rods 5, and more closely fitting the curved blade surface area.

[0057] To further enhance the clamping effect on workpieces with large curvature variations, such as curved blades, the clamping end of the movable clamping rod 5 is constructed of an elastic material. This not only ensures flexibility during clamping but also increases the contact area, preventing damage to the curved blades that could result from overtightening. More importantly, the movable clamping rod 5 features a hollow channel connected to the medium. This allows the medium to flow freely based on local pressure differences, enabling multi-point independent adjustment and significantly improving overall clamping stability.

[0058] Finally, it should be pointed out that the methods and devices described in detail above are merely embodiments, and those skilled in the art can modify these embodiments in different ways without departing from the scope of the present invention.

Claims

1. A support rod for stabilizing blades of a wind direction calibrator, characterized by: include, An outer support rod (1) is provided with a wind direction calibrator (2); A telescopic assembly (3) is capable of being inserted into the outer support rod (1); wherein the telescopic assembly (3) is capable of being telescoped along the axial direction of the outer support rod (1) to achieve height adjustment of the telescopic assembly (3) and the outer support rod (1); a force-applying member, which is provided on the telescopic assembly (3); A pair of clamping jaws (43) are connected to the force applying member, and the force applying member applies a force to the pair of clamping jaws (43) to close to each other.

2. The support rod for stabilizing blades of a wind direction calibrator according to claim 1, characterized in that: The force applying member further includes: A coil spring seat (4) having a threaded hole at its center for connecting with the thread and bolt (41) at the top of the telescopic assembly (3); A coil spring (42) is disposed inside the coil spring seat (4) to provide elastic force for the clamping claw (43); A clamping jaw seat (44) is used to guide the sliding direction of the clamping jaw (43) and is fixed to the coil spring seat (4) via the bolt (41); The upper end of the coil spring seat (4) is also provided with a square groove for limiting the clamping claw seat (44).

3. The support rod for stabilizing blades of a wind direction calibrator according to claim 2, characterized in that: The lower end of the clamping jaws (43) is provided with a long groove (431), and a pair of the clamping jaws (43) are distributed diagonally; A shift fork (421) is sleeved and connected to the surface of the coil spring (42), and two symmetrically distributed shift rods (422) are provided on the upper end of the shift fork (421); when the shift fork (421) rotates clockwise, the shift rods (422) on the shift fork (421) slide in the long groove (431) of the clamping claw (43), thereby shifting the clamping claw (43) to open.

4. The support rod for stabilizing blades of a wind direction calibrator according to claim 3, characterized in that: Oblique grooves with a narrow upper portion and a wide lower portion are provided on both sides of the clamping jaw seat (44), and a tilted structure is provided at the portion where the clamping jaw (43) contacts the clamping jaw seat (44).

5. The support rod for stabilizing blades of a wind direction calibrator according to claim 4, characterized in that: The outer ring of the shift fork (421) is provided with stripe patterns.

6. The support rod for stabilizing blades of a wind direction calibrator according to claim 5, characterized in that: The jaw opening of each clamping jaw (43) is a planar structure as a whole, and a V-shaped groove (432) is provided in the middle.

7. The support rod for stabilizing blades of a wind direction calibrator according to claim 1, characterized in that: The telescopic assembly (3) comprises: A first telescopic rod (31), wherein a notch (32) is provided on the first telescopic rod (31); a spring buckle (33) corresponding to the notch (32) on the first telescopic rod (31); A butterfly spring (34) is used to provide elastic force to enable the spring buckle (33) to clamp the notch (32) on the first telescopic rod (31), thereby achieving height fixation of the first telescopic rod (31); The outer support rod (1) is provided with a square notch, and the spring buckle (33) is used in conjunction with the square notch.

8. The support rod for stabilizing blades of a wind direction calibrator according to claim 7, characterized in that: A cylindrical pin (35) is mounted on the first telescopic rod (31); An inner hole is provided inside the first telescopic rod (31); a compression spring (311) and a second telescopic rod (312) are installed in the inner hole; An internal thread is provided at the upper edge of the first telescopic rod (31), and the internal thread is used to connect with the nut (313).

9. The support rod for stabilizing blades of a wind direction calibrator according to any one of claims 1 to 6, characterized in that: A plurality of movable clamping rods (5) are mounted on opposite sides of a pair of the clamping jaws (43); when the clamping jaws (43) clamp the blade, the plurality of movable clamping rods (5) automatically contract to clamp and support the wind direction test blade; and a force spring is sleeved on the clamping rods.

10. The support rod for stabilizing blades of a wind direction calibrator according to any one of claim 9, characterized in that: A torque seat (51) is provided on one side of a pair of the clamping jaws (43) away from each other, a cavity is provided inside the clamping jaws (43) and is threadedly connected to the torque seat (51), the cavity is filled with a medium, a hollow channel is provided inside the movable clamping rod (5) and is connected to the medium, and the clamping end portion of the movable clamping rod (5) is made of elastic material.

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