Measurement-buckling type sound wave flow meter

Abstract

The utility model discloses a buckling measurement type sound wave flow meter, which relates to the field of flow meters and comprises a front buckling plate, a curved surface convex block is arranged in the front buckling plate, side grooves are arranged on two sides of the front buckling plate, a rear buckling plate is arranged on one side of the front buckling plate, and a flow meter is arranged on one side of the rear buckling plate. A plurality of sets of first fixing protruding blocks and second fixing protruding blocks are fixedly installed on the two sides of the rear buckle plate, and pull rods are arranged in the first fixing protruding blocks and the second fixing protruding blocks in a sleeved mode. The buckling measurement type sound wave flowmeter solves the problem that an existing buckling measurement type sound wave flowmeter is poor in using effect, the first fixing protruding block and the second fixing protruding block are arranged, the pull rod is arranged in the first fixing protruding block and the second fixing protruding block in a sleeved mode, the second limiting block is movably installed on the pull rod through the first installation rod, and the rotating plate is arranged on the top of the second limiting block. A second mounting rod is fixedly mounted on the side edge of the rotating plate, and the second mounting rod is sleeved with a third limiting plate.

Description

Technical Field

[0001] The utility model relates to the field of flow meters, in particular to a buckle-testing type acoustic wave flow meter. Background Art

[0002] An ultrasonic flowmeter is an instrument that uses ultrasonic technology to measure fluid flow. Its working principle is that when ultrasonic waves propagate in a fluid, their propagation speed is affected by the flow velocity of the fluid. By measuring the time difference or frequency difference between the propagation of ultrasonic waves in the fluid upstream and downstream, the flow velocity of the fluid can be calculated, and then the flow rate can be obtained. However, with the popularization of the application of ultrasonic flowmeters in production and life, some problems generated during the use of existing ultrasonic flowmeters have gradually become prominent, affecting the normal use of ultrasonic flowmeters and needing to be solved.

[0003] Existing buckle-type acoustic flow meters are usually provided with a set of front buckle plates. During installation, the front buckle plate is first put on the pipe to be installed, and then the rear buckle plate with the acoustic flow meter is installed on one side of the front buckle plate. The front buckle plate and the rear buckle plate are then initially fixed by multiple sets of bolts. After the front buckle plate and the rear buckle plate are moved to the designated position along the pipe, the bolts are fixed so that the front buckle plate and the rear buckle plate can be fixedly installed at the designated position of the pipe, so that the acoustic flow meter can achieve the designated effect.

[0004] However, for the existing buckle-type acoustic flowmeter, it is rather troublesome to fix the front and rear buckle plates with bolts. After the initial fixation, the front and rear buckle plates need to be slid to the specified position before they can be fixed and installed. The installer needs to hold them throughout the whole process, which affects the installer's installation efficiency and thus affects the practicality of the device. Utility Model Content

[0005] Based on this, the purpose of the present invention is to provide a buckle-type acoustic wave flowmeter to solve the technical problem that the existing buckle-type acoustic wave flowmeter has poor performance.

[0006] In order to achieve the above-mentioned purpose, the utility model provides the following technical solutions: a buckle-type acoustic flowmeter, comprising a front buckle plate, a curved protrusion is arranged inside the front buckle plate, side grooves are opened on both sides of the front buckle plate, a rear buckle plate is arranged on one side of the front buckle plate, a flowmeter is arranged on one side of the rear buckle plate, multiple groups of first fixed protrusions and second fixed protrusions are fixedly installed on both sides of the rear buckle plate, a pull rod is sleeved inside the first fixed protrusion and the second fixed protrusion, a second limit plate is arranged at one end of the pull rod, a first mounting rod is arranged on one side of the pull rod, and a second mounting rod is sleeved on the first mounting rod. Two limit blocks, one end of the second limit block is provided with a rotating plate, second mounting rods are provided on both sides of the rotating plate, a third limit plate is sleeved on the second mounting rod, one end of the third limit plate is fixedly installed on one side of the first fixed protrusion, the first fixed protrusion is provided with two groups of protrusions, an inner cavity is opened in the protrusion, a spring is provided on one side of the inner cavity, one end of the spring is connected to the first limit plate, a first limit block is provided on one side of the first limit plate, a limit rod is fixedly installed on the other side of the first limit plate, and a circular plate is movably installed on one end of the limit rod.

[0007] The cam is secured to the first and second stop members so that the cam is secured to the first and second stop members and the cam is secured to the second stop member so that the cam can be secured to the first and second stop members.

[0008] The present invention is further configured such that a curved through groove is provided in both the front gusset plate and the rear gusset plate, and the curved protrusion is provided on one side of the curved through groove.

[0009] Preferably, by opening curved through grooves in both the front and rear panels, and providing curved protrusions on one side of the curved through grooves, the friction between the front and rear panels and the pipe can be enhanced, so that the device can achieve a better fixing effect.

[0010] The present invention is further configured such that through holes are provided in the first fixing protrusion and the second fixing protrusion, and the pull rod is movably mounted in the through holes inside the first fixing protrusion and the second fixing protrusion.

[0011] Preferably, through holes are opened in the first fixing protrusion and the second fixing protrusion, and the pull rod is movably installed in the through holes inside the first fixing protrusion and the second fixing protrusion to avoid collision between the pull rod and the first fixing protrusion and the second fixing protrusion, thereby affecting the normal use of the device.

[0012] The utility model is further configured such that the inner cavity is tilted, and the tilt angle is the same as the tilt angle of one side of the protrusion set on the top of the first fixed protrusion, a through hole is provided on one side of the inner cavity, and the limiting rod is sleeved in the through hole provided on one side of the inner cavity.

[0013] Preferably, by tilting the inner cavity, and the tilting angle is the same as the tilting angle of one side of the protrusion set on the top of the first fixed protrusion, the tilted inner cavity will cause the first limit block to be tilted as well, so that the rotating plate can have a better extrusion effect when contacting the first limit block, and when the rotating plate is rotated to the specified position, the contact area with the rotating plate can be increased, thereby achieving a better limiting effect. A through hole is provided on one side of the inner cavity, and the limit rod is sleeved in the through hole provided on one side of the inner cavity to avoid the limit rod from colliding with the first fixed protrusion during installation, thereby affecting the normal use of the device.

[0014] The present invention is further configured such that one side of the protrusion arranged on the top of the first fixing protrusion is provided with an inclined surface, and one end of the first limiting block is provided with an inclined surface.

[0015] Preferably, by providing an inclined surface on one side of the protrusion arranged on the top of the first fixed protrusion, it is possible to determine whether the turn plate has rotated to the specified position, and an inclined surface is provided at one end of the first limit block to facilitate the turn plate to apply pressure to the first limit block, thereby achieving a sliding effect.

[0016] The utility model is further configured such that the distance between the two groups of protrusions arranged on the top of the first fixed protrusion is the same as the end width of the rotating plate, and the rotating plate is movably installed between the two groups of protrusions arranged on the top of the first fixed protrusion.

[0017] Preferably, by setting the distance between the two groups of protrusions arranged on the top of the first fixed protrusion to be the same as the width of the end of the rotating plate, it is possible to avoid collision between the rotating plate and the first fixed protrusion, thereby affecting the normal use of the device. The rotating plate is movably installed between the two groups of protrusions set on the top, which can serve as a limit for the rotating plate.

[0018] The present invention is further configured such that the second limiting plate provided at one end of the pull rod is movably installed in the side groove, and the width of the side groove is greater than the thickness of the second limiting plate.

[0019] Preferably, a second limit plate provided at one end of the pull rod is movably installed in the side groove, so that when the pull rod slides to one side, the second limit plate can clamp the front buckle plate, thereby fixing the front buckle plate and the rear buckle plate together. The width of the side groove is greater than the thickness of the second limit plate, which can avoid the second limit plate from colliding with the front buckle plate, thereby affecting the normal use of the device.

[0020] The present invention is further configured such that a U-shaped groove is provided in the second limiting block, and the second limiting block is sleeved on the pull rod and the first mounting rod through the U-shaped groove.

[0021] Preferably, a U-shaped groove is opened in the second limit block, and the second limit block is mounted on the pull rod and the first mounting rod through the U-shaped groove, which facilitates the mounting of the second limit block and avoids collision between the second limit block and the pull rod, thereby affecting the fixing effect of the device.

[0022] In summary, the present invention has the following beneficial effects:

[0023] 1. The utility model solves the problem of poor performance of the existing buckle-type acoustic flowmeter by providing a front buckle plate, a curved protrusion, a side groove, a rear buckle plate, a flowmeter, a first fixed protrusion, a second fixed protrusion, an inner cavity, a spring, a limit rod, a first limit plate, a first limit block, a rotating rod, an inner cavity of the rotating rod, a pull rod, a second limit plate, a first mounting rod, a third limit plate, a second limit block, a rotating plate and a second mounting rod. The utility model solves the problem of poor performance of the existing buckle-type acoustic flowmeter by providing a first fixed protrusion and a second fixed protrusion, a pull rod is provided in the first fixed protrusion and the second fixed protrusion, a second limit block is movably installed on the pull rod through the first mounting rod, a rotating plate is provided on the top of the second limit block, and the rotating plate is provided. A second mounting rod is fixedly installed on the side of the plate, and a third limit plate is sleeved on the second mounting rod. One end of the third limit plate is movably installed on one side of the first fixed protrusion. When the front buckle plate and the rear buckle plate are sleeved on the pipe and need to be fixed, the pull rod is made to slide to one side by toggling the rotating plate upwards, so that the second limit plate fixed at one end of the pull rod squeezes one side of the side groove opened on both sides of the front buckle plate, so that the front buckle plate and the rear buckle plate can fit tightly, thereby achieving a fixing effect of the front buckle plate and the rear buckle plate, so that the acoustic flowmeter can be used satisfactorily. At the same time, the fixing effect is achieved by toggling the rotating plate, which is easy to operate and can realize quick installation of the device, making the device more practical.

[0024] 2. The utility model is provided with a first fixed protrusion, an inner cavity is obliquely provided inside the first fixed protrusion, a spring is provided on one side of the inner cavity, one end of the spring is connected to the first limit plate, a first limit block is provided on one side of the first limit plate, and a limit rod is provided on the other side of the first limit plate, and a circular plate is provided on one end of the limit rod. When the rotating plate is toggled to a certain angle, the first limit block is squeezed downward by the inclined surface provided by the first limit block, so that the first limit block slides into the inner cavity. When the rotating plate slides over the first limit block and is toggled to the index position, the first limit block is pressed downward by the inclined surface provided by the first limit block, so that the first limit block slides into the inner cavity. After being positioned, the first limit block will be reset by the spring arranged at the bottom, thereby limiting the rotating plate and preventing the rotating plate from sliding to one side, thereby affecting the fixing effect of the second limit plate on the front buckle plate and the rear buckle plate. At the same time, a circular plate is provided at one end of the limit rod. When it is necessary to release the fixation of the front buckle plate and the rear buckle plate, the first limit block is pulled into the inner cavity by holding the circular plate, and the rotating plate is moved to one side so that the second limit plate does not contact the side edge of the side groove, thereby being able to quickly release the fixation of the front buckle plate and the rear buckle plate, making the device more practical. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a first structural diagram of the utility model;

[0026] Figure 2 This is a second structural diagram of the present utility model;

[0027] Figure 3 It is a partial enlarged view of the utility model;

[0028] Figure 4 This is an oblique cross-sectional view of the inner cavity of the utility model;

[0029] Figure 5 This is a detailed diagram of the pull rod of the utility model;

[0030] Figure 6 This is a detailed diagram of the second limit block of the present utility model.

[0031] Description of reference numerals:

[0032] 1. Front buckle plate; 2. Curved protrusion; 3. Side groove; 4. Rear buckle plate; 41. Flowmeter; 5. First fixed protrusion; 51. Second fixed protrusion; 6. Inner cavity; 7. Spring; 8. Limit rod; 81. First limit plate; 82. First limit block; 9. Circular plate; 10. Pull rod; 101. Second limit plate; 102. First mounting rod; 11. Third limit plate; 12. Second limit block; 13. Rotating plate; 131. Second mounting rod. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. The embodiments described below with reference to the drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0034] The following describes an embodiment of the present invention based on its overall structure.

[0035] See also Figures 1-6 , including a front gusset plate 1, a curved protrusion 2 is provided inside the front gusset plate 1, side grooves 3 are opened on both sides of the front gusset plate 1, a rear gusset plate 4 is provided on one side of the front gusset plate 1, a flow meter 41 is provided on one side of the rear gusset plate 4, multiple groups of first fixed protrusions 5 and second fixed protrusions 51 are fixedly installed on both sides of the rear gusset plate 4, a pull rod 10 is sleeved in the first fixed protrusion 5 and the second fixed protrusion 51, a second limit plate 101 is provided at one end of the pull rod 10, a first mounting rod 102 is provided on one side of the pull rod 10, a second limit block 12 is sleeved on the first mounting rod 102, and the second limit block 12 A rotating plate 13 is provided at one end, and second mounting rods 131 are provided on both sides of the rotating plate 13. A third limiting plate 11 is sleeved on the second mounting rod 131. One end of the third limiting plate 11 is fixedly mounted on one side of the first fixed protrusion 5. The first fixed protrusion 5 is provided with two groups of protrusions, and an inner cavity 6 is opened in the protrusion. A spring 7 is provided on one side of the inner cavity 6. One end of the spring 7 is connected to the first limiting plate 81, and a first limiting block 82 is provided on one side of the first limiting plate 81. A limiting rod 8 is fixedly mounted on the other side of the first limiting plate 81, and a circular plate 9 is movably mounted on one end of the limiting rod 8.

[0036] In the above embodiment, please refer to Figure 1 and Figure 2 The front and rear panels 1 and 4 are both provided with curved through grooves, and the curved protrusions 2 are arranged on one side of the curved through grooves. By providing curved through grooves in the front and rear panels 1 and 4, and the curved protrusions 2 are arranged on one side of the curved through grooves, the friction between the front and rear panels 1 and 4 and the pipeline can be enhanced, so that the device can achieve a better fixing effect.

[0037] In the above embodiment, please refer to Figure 1 and Figure 2 A through hole is opened in the first fixed protrusion 5 and the second fixed protrusion 51, and the pull rod 10 is movably installed in the through hole inside the first fixed protrusion 5 and the second fixed protrusion 51. By opening a through hole in the first fixed protrusion 5 and the second fixed protrusion 51, the pull rod 10 is movably installed in the through hole inside the first fixed protrusion 5 and the second fixed protrusion 51, thereby avoiding collision between the pull rod 10 and the first fixed protrusion 5 and the second fixed protrusion 51, thereby affecting the normal use of the device.

[0038] In the above embodiment, please refer to Figure 3 and Figure 4 The inner cavity 6 is tilted, and the tilted angle is the same as the tilted angle of one side of the protrusion set on the top of the first fixed protrusion 5. A through hole is provided on one side of the inner cavity 6, and the limiting rod 8 is sleeved in the through hole provided on one side of the inner cavity 6. By tilting the inner cavity 6, and the tilted angle is the same as the tilted angle of one side of the protrusion set on the top of the first fixed protrusion 5, the tilted inner cavity 6 will make the first limit block 82 also tilted, so that the rotating plate 13 can have a better extrusion effect when contacting the first limit block 82. When the rotating plate 13 is rotated to the specified position, the contact area with the rotating plate 13 can be increased, thereby achieving a better limiting effect. A through hole is provided on one side of the inner cavity 6, and the limiting rod 8 is sleeved in the through hole provided on one side of the inner cavity 6 to avoid the limiting rod 8 from colliding with the first fixed protrusion 5 during installation, thereby affecting the normal use of the device.

[0039] In the above embodiment, please refer to Figure 3 and Figure 4 An inclined surface is provided on one side of the protrusion arranged on the top of the first fixed protrusion 5, and an inclined surface is provided on one end of the first limit block 82. By providing an inclined surface on one side of the protrusion arranged on the top of the first fixed protrusion 5, it is possible to determine whether the rotating plate 13 is rotated to the specified position. An inclined surface is provided on one end of the first limit block 82, which makes it easier for the rotating plate 13 to apply pressure to the first limit block 82, thereby achieving a sliding effect.

[0040] In the above embodiment, please refer to Figure 1 and Figure 2 The distance between the two groups of protrusions provided on the top of the first fixed protrusion 5 is the same as the width of the end of the rotating plate 13. The rotating plate 13 is movably installed between the two groups of protrusions provided on the top of 5. By setting the distance between the two groups of protrusions provided on the top of the first fixed protrusion 5 to be the same as the width of the end of the rotating plate 13, the rotating plate 13 can be prevented from colliding with the first fixed protrusion 5, thereby affecting the normal use of the device. The rotating plate 13 is movably installed between the two groups of protrusions provided on the top of the first fixed protrusion 5, which can play a limiting role on the rotating plate 13.

[0041] In the above embodiment, please refer to Figure 1 and Figure 2The second limit plate 101 set at one end of the pull rod 10 is movably installed in the side groove 3, and the width of the side groove 3 is greater than the thickness of the second limit plate 101. By movably installing the second limit plate 101 set at one end of the pull rod 10 in the side groove 3, when the pull rod 10 slides to one side, the second limit plate 101 set can have a clamping effect on the front buckle plate 1, so that the front buckle plate 1 and the rear buckle plate 4 can be fixed together. The width of the side groove 3 is greater than the thickness of the second limit plate 101, which can avoid the second limit plate 101 from colliding with the front buckle plate 1, thereby affecting the normal use of the device.

[0042] In the above embodiment, please refer to Figure 1 and Figure 6 A U-shaped groove is provided in the second limit block 12, and the second limit block 12 is sleeved on the pull rod 10 and the first mounting rod 102 through the U-shaped groove. By providing a U-shaped groove in the second limit block 12, the second limit block 12 is sleeved on the pull rod 10 and the first mounting rod 102 through the U-shaped groove, which facilitates the sleeve of the second limit block 12 and avoids the second limit block 12 from colliding with the pull rod 10, thereby affecting the fixing effect of the device.

[0043] During the specific operation of the present invention: when the flow meter 41 needs to be installed, the rear plate 4 is first fitted to one side of the pipe, and then the front plate 1 is slid along the pipe so that the front plate 1 is sleeved on one side of the rear plate 4. At the same time, the second limit plate 101 set at one end of the pull rod 10 is sleeved in the side groove 3, and a first fixed protrusion 5 and a second fixed protrusion 51 are provided on one side of the rear plate 4. The first fixed protrusion 5 and the second fixed protrusion 51 are sleeved with a pull rod 10, and a second limit block 12 is movably installed on the pull rod 10 through the first installation rod 102. A rotating plate 13 is provided on the top of the second limit block 12, and a second fixed plate 13 is fixedly installed on the side of the rotating plate 13 The second mounting rod 131 is provided with a third limiting plate 11, one end of the third limiting plate 11 is movably mounted on one side of the first fixed protrusion 5, and when the front gusset plate 1 and the rear gusset plate 4 are mounted on the pipe and need to be fixed, the rotating plate 13 is toggled upwards, and the pull rod 10 is made to slide to one side through the third limiting plate 11, so that the second limiting plate 101 fixed at one end of the pull rod 10 squeezes one side of the side groove 3 opened on both sides of the front gusset plate 1, so that the front gusset plate 1 and the rear gusset plate 4 can fit tightly, so that the front gusset plate 1 and the rear gusset plate 4 can achieve a fixing effect, so that the flow meter 41 can be used satisfactorily. The fixing effect is achieved, the operation is simple, the device can be quickly installed, and the device is more practical. An inner cavity 6 is obliquely arranged inside the first fixing protrusion 5, and a spring 7 is arranged on one side of the inner cavity 6. One end of the spring 7 is connected to a first limiting plate 81, and a first limiting block 82 is arranged on one side of the first limiting plate 81, and a limiting rod 8 is arranged on the other side of the first limiting plate 81. A circular plate 9 is arranged at one end of the limiting rod 8. When the rotating plate 13 is toggled to a certain angle, the first limiting block 82 will be squeezed downward by the inclined surface set by the first limiting block 82, so that the first limiting block 82 slides into the inner cavity. When the rotating plate 13 slides past the first limiting block After the block 82 is moved to the specified position, the first limit block 82 will be reset by the spring 7 set at the bottom, thereby having a limiting effect on the rotating plate 13, preventing the rotating plate 13 from sliding to one side, thereby affecting the fixing effect of the second limit plate 101 on the front buckle plate 1 and the rear buckle plate 4. At the same time, a circular plate 9 is provided at one end of the limiting rod 8. When it is necessary to release the fixation of the front buckle plate 1 and the rear buckle plate 4, the first limit block 82 is pulled into the inner cavity by holding the circular plate 9, and then the rotating plate 13 is moved to one side so that the second limit plate 101 does not contact the side of the side groove 3, thereby being able to quickly release the fixation of the front buckle plate 1 and the rear buckle plate 4, and completing the disassembly of the device.

[0044] Although embodiments of the present invention have been shown and described, these specific embodiments are merely explanations of the present invention and are not limitations on the present invention. The specific features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. After reading this specification, those skilled in the art may make modifications, substitutions, and variations to the embodiments as needed without departing from the principles and purpose of the present invention, but as long as they are within the scope of the claims of the present invention, they are protected by patent law.

Claims

1. A buckle-type acoustic flowmeter, comprising a front buckle plate (1), characterized in that: The front buckle plate (1) is provided with a curved surface protrusion (2) inside, and side grooves (3) are provided on both sides of the front buckle plate (1). A rear buckle plate (4) is provided on one side of the front buckle plate (1), and a flow meter (41) is provided on one side of the rear buckle plate (4). Multiple groups of first fixed protrusions (5) and second fixed protrusions (51) are fixedly installed on both sides of the rear buckle plate (4), and a pull rod (10) is provided inside the first fixed protrusion (5) and the second fixed protrusion (51), and a second limiting plate (101) is provided at one end of the pull rod (10), and a first mounting rod (102) is provided on one side of the pull rod (10), and a second limiting block (12) is provided on the first mounting rod (102), and one end of the second limiting block (12) is fixedly installed on the second mounting rod (102). A rotating plate (13) is provided, and second mounting rods (131) are provided on both sides of the rotating plate (13). A third limiting plate (11) is sleeved on the second mounting rod (131), and one end of the third limiting plate (11) is fixedly installed on one side of the first fixed protrusion (5). The first fixed protrusion (5) is provided with two groups of protrusions, and an inner cavity (6) is provided in the protrusion. A spring (7) is provided on one side of the inner cavity (6), and one end of the spring (7) is connected to the first limiting plate (81). A first limiting block (82) is provided on one side of the first limiting plate (81), and a limiting rod (8) is fixedly installed on the other side of the first limiting plate (81), and a circular plate (9) is movably installed on one end of the limiting rod (8).

2. The button-type acoustic wave flowmeter according to claim 1, characterized in that: The front gusset plate (1) and the rear gusset plate (4) are both provided with a curved through groove, and the curved protrusion (2) is arranged on one side of the curved through groove.

3. The button-type acoustic wave flowmeter according to claim 1, characterized in that: Through holes are provided in the first fixed protrusion (5) and the second fixed protrusion (51), and the pull rod (10) is movably mounted in the through holes in the first fixed protrusion (5) and the second fixed protrusion (51).

4. The button-type acoustic wave flowmeter according to claim 1, characterized in that: The inner cavity (6) is tilted, and the tilt angle is the same as the tilt angle of the protrusion arranged on the top of the first fixed protrusion (5). A through hole is provided on one side of the inner cavity (6), and the limiting rod (8) is sleeved in the through hole provided on one side of the inner cavity (6).

5. The button-type acoustic wave flowmeter according to claim 1, characterized in that: One side of the protrusion arranged at the top of the first fixed protrusion (5) is provided with an inclined surface, and one end of the first limiting block (82) is provided with an inclined surface, and the angle of the inclined surface of the protrusion is the same as that of the inclined surface of the first limiting block (82).

6. The button-type acoustic wave flowmeter according to claim 1, characterized in that: The distance between the two groups of bumps provided on the top of the first fixed bump (5) is the same as the width of the end of the rotating plate (13), and the rotating plate (13) is movably mounted between the two groups of bumps provided on the top of the first fixed bump (5).

7. The button-type acoustic wave flowmeter according to claim 1, characterized in that: A second limiting plate (101) provided at one end of the pull rod (10) is movably installed in the side groove (3), and the width of the side groove (3) is greater than the thickness of the second limiting plate (101).

8. The button-type acoustic wave flowmeter according to claim 1, characterized in that: A U-shaped groove is provided in the second limiting block (12), and the second limiting block (12) is sleeved on the pull rod (10) and the first mounting rod (102) through the U-shaped groove.

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