An auxiliary fixture for online calibration of liquid flowmeter

Abstract

The present invention discloses an auxiliary clamp for online calibration of a liquid flow meter, which relates to the technical field of liquid flow monitoring. The present invention includes two sets of basic structures, wherein the basic structure includes a fixed clamp, a sliding rod and a movable clamp, wherein the fixed clamp is used to fix the flow meter sensor, the fixed clamp is fixedly installed at one end of the sliding rod, the movable clamp is slidably connected to the sliding rod, the movable clamp is used to fix the pipeline, and the movable clamp is located at the end of the sliding rod away from the fixed clamp. The basic structure also includes a clamping mechanism, a limiting mechanism and a driving mechanism. The advantages are: the present invention uses only one driving mechanism to allow the device to move horizontally and vertically at the same time, quickly fix the position, and at the same time, when fixing the position, the proportional relationship between the fixed clamps can be used to indirectly obtain the distance between the flow meters, saving measurement time, simple and quick operation, and improving work efficiency. During the clamping process, the limiting column automatically locks the spur gear to avoid damage to the pipeline caused by excessive clamping.

Description

Technical Field

[0001] The present invention relates to the technical field of liquid flow monitoring, and in particular to an auxiliary fixture for online calibration of a liquid flow meter. Background Art

[0002] A flowmeter is a device used to measure the flow of liquid or gas through a pipe, channel, or pipeline. Flowmeter calibration is crucial to ensuring accurate and reliable flow data. Inaccurate flowmeter measurements can lead to errors in the production process and even affect product quality and safety.

[0003] During in-line calibration of a liquid flow meter, an auxiliary fixture can be used to help secure and stabilize the meter. This fixture is typically a bracket or clamp that secures the meter and holds it in a specific position and orientation. This ensures the meter remains aligned with the fluid flow direction and provides stable measurement conditions.

[0004] During the calibration process, the auxiliary fixture can also help prevent the liquid flow meter from being affected by external interference or vibration, ensuring the accuracy and reliability of the calibration. The use of auxiliary fixtures can improve the efficiency and accuracy of online calibration of liquid flow meters, while protecting the flow meter from external interference and ensuring the reliability of the calibration results.

[0005] In the prior art, the clamp frame is set up on a clean flow pipe, and the pipe is usually clamped and fixed by a manual rotating device, using a nut to lock, etc. The disadvantage is that the force of pipe clamping cannot be controlled well. Too light a clamping force may cause the pipe to fall off, and too heavy a clamping force may cause damage to the outer wall of the pipe. Damage to the outside of the flow pipe will affect the measurement accuracy of the flow meter. At the same time, the measuring distance between the flow meters needs to be measured. Errors are prone to occur in estimating the scale during the measurement process, resulting in reduced measurement accuracy. At the same time, when measuring with a flow meter, it is sometimes necessary to measure different positions of the pipe at different temperatures. The auxiliary clamp in the prior art has a single function and cannot realize the measurement of different temperatures under the same environment by the device, resulting in poor practicality of the device. At the same time, the flow meter and the pipe need to be fixed in position multiple times, which is cumbersome to operate and has low work efficiency. Summary of the Invention

[0006] The purpose of the present invention is to solve the problems of excessive pipe clamping and low flow meter measurement accuracy in the prior art, and to propose an auxiliary clamp for online calibration of a liquid flow meter.

[0007] To achieve the above-mentioned object, the present invention adopts the following technical solution: an auxiliary clamp for online calibration of a liquid flow meter, comprising two sets of basic structures, wherein the basic structures include a fixed clamp, a slide bar, and a movable clamp, wherein the fixed clamp is used to fix the flow meter sensor, the fixed clamp is fixedly mounted on one end of the slide bar, the movable clamp is slidably connected to the slide bar, the movable clamp is used to fix the pipeline, and the movable clamp is located at the end of the slide bar away from the fixed clamp, and the basic structure further comprises:

[0008] A clamping mechanism, comprising a clamping member fixedly mounted on one side of the movable clamp, the clamping member being arc-shaped and used to clamp the pipe, and a plurality of suction cups fixedly mounted on one side of the clamping member in contact with the pipe, the suction cups being used to adsorb and fix the side wall of the pipe;

[0009] A limiting mechanism includes a connecting piece fixedly mounted inside a fixing clamp, the connecting piece is rotatably connected to a pressure block, a spring is connected between the pressure block and the fixing clamp, the pressure block is used to fix the flow meter sensor, and a placement slot is provided inside the fixing clamp;

[0010] The driving mechanism is located on a side of the movable clamp away from the clamping member, and is used to drive the movable clamp to move vertically and horizontally.

[0011] Preferably, a semiconductor refrigeration plate is fixedly installed on the side of the clamping member away from the pipeline, and the semiconductor refrigeration plate is used to adjust the cooling capacity. The fixed clamp is used to fix the position of the flow meter sensor. A silicone block is fixedly installed between the clamping member and the movable clamp, and the silicone block is used to reduce the pressure of the pipeline being clamped. A limiting column is fixedly installed on the side of the silicone away from the clamping member, and the limiting column is used to fix the spur gear to stop rotating. A plurality of springs are fixedly installed between the clamping member and the movable clamp.

[0012] Preferably, the driving mechanism includes a rotating rod installed through one end of the movable clamp, a pawl is fixedly installed on one end of the rotating rod located inside the movable clamp, a plurality of limit blocks are fixedly installed on the pawl, the pawl is rotatably connected to a ratchet, a crown gear is fixedly installed on the end of the ratchet away from the pawl, and the pawl is used to drive the crown gear to rotate.

[0013] Preferably, the end of the rotating rod away from the fixed clamp is rotatably connected to a sleeve, and the sleeve passes through the movable clamp. A slot is provided on the side where the movable clamp is connected to the sleeve, and the slot is located inside the movable clamp. A block is installed on the sleeve, and the block and the slot are used to limit the rotating rod from rotating.

[0014] Preferably, the end of the sleeve away from the movable clamp is slidably connected to a rotary valve, and the rotary valve is used to rotate the rotating rod. A rotating groove is opened inside the rotary valve, and the rotating rod extends through the sleeve and enters the rotary valve. A rotating block is fixedly installed on the side wall of the rotating rod, and the rotating block is located inside the rotating groove.

[0015] Preferably, a fixed ring and a fixed wheel are installed inside the movable clamp, the rotating rod extends through the fixed ring, and a spur gear is rotatably connected between the fixed ring and the fixed wheel, the spur gear is engaged with the crown gear, and the spur gear is used to drive the fixed ring and the fixed wheel to rotate together.

[0016] Preferably, a rack is fixedly mounted on one side of the slide bar close to the spur gear, the rack is engaged with the spur gear, and the spur gear and the rack are used to drive the movable clamp to slide laterally on the slide bar.

[0017] Preferably, the movable clamp is rotatably connected to a push rod, and a top block is fixedly installed on the top of the push rod. The top block is located inside the movable clamp, and the top block is used to limit the rotation range of the push rod. The top block is rotatably connected to the movable clamp, and the push rod is located at the center of the fixed ring. A plurality of push blocks are fixedly installed on the side walls of the push rod, and the push blocks are located inside the spur gear. The push blocks are used to drive the push rod to rotate.

[0018] Preferably, it also includes a position adjustment mechanism, which is used to fix and adjust the positions of the two sets of basic structures. The position adjustment mechanism is a screw that is rotatably connected to the push rod, and the end of the screw away from the fixing ring is fixedly installed with a limit bar, and the limit bar is used to limit the screw from rotating. The end of the limit bar away from the screw is fixedly installed with a sliding bar, and the limit bar is located in the middle position of the sliding bar.

[0019] Preferably, the slide bar passes through the slide rod and is slidably connected to the slide rod. Slide grooves are provided on both sides of the slide bar. The slide rod moves up and down on the slide bar. The slide bar is used to adjust the position of the movable clamp. Bolts are installed at the upper and lower ends of the slide bar, and the bolts are connected with nuts. The bolts and nuts are used to limit the position of the slide rod.

[0020] Compared with the existing technology, the advantages of the present invention are:

[0021] 1. The present invention installs a limiting mechanism inside the fixing clamp and uses the interaction force between the spring and the pressure block to fix the flow meter sensor. This eliminates the need for manual fixing of the flow meter placed inside the fixing clamp, thus saving working time and improving working efficiency.

[0022] 2. The present invention fixes and clamps the pipe by installing a clamping mechanism. The clamping member is arc-shaped, which is conducive to increasing the clamping area when clamping the pipe, making the pipe clamp more secure. At the same time, the suction cup absorbs the gas to form a negative pressure to fix the pipe, making the pipe more stable. At the same time, the suction cup has a certain degree of elasticity and softness, which prevents damage caused by excessive pressure when the clamping member clamps the pipe.

[0023] 3. The present invention installs a silicone block and a limit block on the clamping member. When the pipe is firmly clamped, the limit block directly limits the rotation of the spur gear, making it impossible for the clamping member to move closer to the pipe. This automatically limits the rotation of the spur gear, effectively controls the pipe clamping pressure, and avoids damage to the pipe caused by excessive clamping of the clamping member.

[0024] 4. The present invention only installs one driving mechanism and utilizes the meshing relationship between gears to enable the fixed clamp to move vertically and horizontally at the same time, avoiding multiple position determinations of the device and cumbersome operations. The operation is simple and quick, thereby improving work efficiency. At the same time, by setting the distance between the teeth, the horizontal and vertical ratios of the movable clamp when sliding are locked. The distance between the two flow meter sensors can be directly obtained by the diameter of the clamped pipes, so that the distance between the two flow meter sensors does not need to be measured during the liquid flow measurement process, making the measurement work more convenient, the work efficiency higher, and the measurement data more accurate.

[0025] 5. The semiconductor refrigeration plate of the present invention can heat or cool the clamping part, so that the device can simulate the changes in liquid flow at different temperatures during the measurement process. The present invention can be split into two measuring components, which can measure different areas of the pipeline respectively, increase the use scenarios of the device, and make the working range of the device wider.

[0026] In summary, the present invention uses only one driving mechanism to enable the device to move horizontally and vertically at the same time, quickly fix the position, and is simple and quick to operate, thereby improving work efficiency. The two clamping methods of fixed clamping and movable clamping are used to make the clamping work more stable. The distance between the teeth and the ratio of the horizontal to vertical directions when the movable clamp slides are used to indirectly obtain the distance between the flow meter sensors, saving measurement time and avoiding large errors caused by manual measurement, making the measurement more accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a structural schematic diagram of an auxiliary fixture for online calibration of a liquid flow meter proposed by the present invention;

[0028] Figure 2 This is a schematic diagram of the shaft-side structure of the fixed clamp and the movable clamp of an auxiliary clamp for online calibration of a liquid flow meter proposed by the present invention;

[0029] Figure 3This is a schematic diagram of the half-section axial structure of a fixing clamp of an auxiliary fixture for online calibration of a liquid flow meter proposed by the present invention;

[0030] Figure 4 This is a schematic diagram of the half-section axial structure of a movable clamp of an auxiliary clamp for online calibration of a liquid flow meter proposed by the present invention;

[0031] Figure 5 This is a schematic diagram of the cross-section of the movable clamp side of an auxiliary clamp for online calibration of a liquid flow meter proposed by the present invention;

[0032] Figure 6 This is a schematic structural diagram of the crown gear and spur gear portion of an auxiliary fixture for online calibration of a liquid flow meter proposed by the present invention;

[0033] Figure 7 This is a schematic structural diagram of the ratchet and pawl parts of an auxiliary fixture for online calibration of a liquid flow meter proposed by the present invention;

[0034] Figure 8 This is a schematic structural diagram of the pawl and rotating rod portion of an auxiliary fixture for online calibration of a liquid flow meter proposed by the present invention;

[0035] Figure 9 This is a schematic diagram of the half-section axial structure of the sleeve and rotary valve of an auxiliary fixture for online calibration of a liquid flow meter proposed by the present invention;

[0036] Figure 10 This is a schematic diagram of the internal structure of a movable clamp of an auxiliary clamp for online calibration of a liquid flow meter proposed by the present invention;

[0037] Figure 11 This is a schematic structural diagram of the screw and push rod portion of an auxiliary fixture for online calibration of a liquid flow meter proposed by the present invention;

[0038] Figure 12 This is a schematic structural diagram of the bolt and slide bar portion of an auxiliary fixture for online calibration of a liquid flow meter proposed by the present invention;

[0039] Figure 13 This is a schematic diagram of the three-quarter axial structure of a movable clamp of an auxiliary clamp for online calibration of a liquid flow meter proposed by the present invention;

[0040] Figure 14 This is a schematic diagram of the structure of the clamping part and the silicone block of an auxiliary clamp for online calibration of a liquid flow meter proposed by the present invention;

[0041] Figure 15 This is a schematic diagram of the half-section axial structure of a silicone block of an auxiliary fixture for online calibration of a liquid flow meter proposed by the present invention;

[0042] Figure 16This is a schematic diagram of the half-section axial structure of a clamping member of an auxiliary clamp for online calibration of a liquid flow meter proposed by the present invention;

[0043] Figure 17 This is a structural schematic diagram of an auxiliary fixture for online calibration of a liquid flow meter proposed by the present invention;

[0044] Figure 18 This is a schematic diagram of the disassembled structure of the slide bar and slide rod of an auxiliary fixture for online calibration of a liquid flow meter proposed by the present invention;

[0045] Figure 19 This is a schematic diagram of the disassembled structure of the fixing ring and spur gear of an auxiliary fixture for online calibration of a liquid flow meter proposed by the present invention.

[0046] In the figure: 1 fixing clamp, 11 flow meter sensor, 12 connecting piece, 13 pressure block, 2 sliding rod, 21 rack, 3 movable clamp, 31 sleeve, 311 card block, 3111 card slot, 312 limit block, 313 pawl, 314 crown gear, 315 ratchet, 316 rotating rod, 317 rotary valve, 3171 rotating block, 3172 rotating slot, 32 fixing ring, 321 spur gear, 322 pushing block, 323 fixed wheel, 33 top block, 331 push rod, 332 screw, 333 limit strip, 34 clamping piece, 341 silicone block, 3411 limit column, 342 semiconductor cooling plate, 343 suction cup, 4 sliding bars, 41 bolts, 42 nuts. DETAILED DESCRIPTION

[0047] The technical solutions in the embodiments of the present invention will be clearly and completely described 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.

[0048] Reference Figure 1 and Figure 3 , an auxiliary clamp for online calibration of a liquid flow meter includes two groups of basic structures, which are fixed together by a position adjustment mechanism. The basic structure includes a fixing clamp 1, and a limiting mechanism is fixedly installed inside the fixing clamp 1. The limiting mechanism includes a connecting piece 12 fixedly installed inside the fixing clamp 1, and the connecting piece 12 is rotatably connected to a pressure block 13. The upper part of the pressure block 13 is rotatably connected to the connecting piece 12, and a spring is fixedly connected between the pressure block 13 and the fixing clamp 1. A placement groove is opened inside the fixing clamp 1, and the placement groove is used to place the flow meter sensor 11. The fixing clamp 1 is used to fix the flow meter sensor 11. The flow meter sensor 11 is placed in the placement groove to squeeze the pressure block 13. After the pressure block 13 squeezes the spring, it is subjected to the reaction force of the spring. The flow meter sensor 11 is directly fixed after being placed in the fixing clamp 1. The operation is simple and quick, and there is no need to perform additional fixing work after the flow meter sensor 11 is placed in the position, which saves working time and improves work efficiency.

[0049] Reference Figure 1 and Figure 12 The cam 4 is connected to the cam 4 at one end and the cam 4 is connected to the cam 4 at the other end, and the cam 4 is connected to the cam 4 at the other end, and the cam 4 is connected to the cam 4 at the other end, and the cam 4 is connected to the cam 4 at the other end.

[0050] Reference Figure 2 、 Figure 4 、 Figure 6-9 When the locking cam 315 is unlocked, the locking cam 316 can be unlocked, and the locking cam 316 can be unlocked when the locking cam 315 is unlocked.

[0051] A pawl 313 is fixedly mounted on the rotating rod 316. The pawl 313 is located at the end of the rotating rod 316 away from the rotary valve 317. A plurality of limit blocks 312 are fixedly mounted on the pawl 313. The pawl 313 is rotatably connected to a ratchet 315. The pawl 313 is used to drive the ratchet 315 to rotate. A crown gear 314 is fixedly mounted on the end of the ratchet 315 away from the sleeve 31. The crown gear 314 rotates together with the ratchet 315 to enable the movable clamp 3 to start to move horizontally and vertically.

[0052] Reference Figure 10 and Figure 19A fixing ring 32 and a fixing wheel 323 are installed inside the movable clamp 3, and a spur gear 321 is rotatably connected between the fixing ring 32 and the fixing wheel 323. A rack 21 is fixedly installed on the slide rod 2, and the spur gear 321 is engaged with the crown gear 314. The spur gear 321 is engaged with the rack 21. The crown gear 314 drives the spur gear 321 to rotate, and the spur gear 321 and the rack 21 are used to move the movable clamp 3 left and right.

[0053] Reference Figure 4-6 、 Figure 10-11 and Figure 17-18 The cam 332 is fixed on the cam 333 to the upper end of the cam 334, and the cam 333 is fixed on the cam 334 to the lower end of the cam 334.

[0054] Reference Figure 2 and Figure 13-16 , the clamping mechanism includes a clamping member 34 fixedly installed on the side of the movable clamp 3 away from the rotary valve 317. The clamping member 34 is arc-shaped, which is conducive to clamping and fixing the side wall of the pipeline, increasing the clamping area, and making the clamping effect better. A suction cup 343 is fixedly installed on the side of the clamping member 34 that fits the pipeline. The suction cup 343 forms a negative pressure by adsorbing gas to achieve the purpose of fixing the pipeline, avoiding the pipeline movement when the flow meter sensor 11 is in use, and making the measurement effect more accurate.

[0055] A semiconductor refrigeration plate 342 is fixedly installed on the side of the clamping member 34 away from the pipeline. The semiconductor refrigeration plate 342 is used to adjust the cooling capacity, thereby achieving precise control of the temperature, so that the flow meter can measure at different temperatures, making the measurement range wider and the measurement more accurate. A silicone block 341 and a limit column 3411 are fixedly installed on the end of the clamping member 34 close to the movable clamp 3. The silicone block 341 is located around the clamping member 34, and the limit column 3411 is located in the middle position of the clamping member 34. The limit column 3411 is used to fix the spur gear 321 to stop rotating. A plurality of springs are fixedly installed between the clamping member 34 and the movable clamp 3. The silicone block 341 and the spring are used to reduce pressure to avoid damage to the pipeline due to excessive clamping pressure of the clamping member 34 when clamping the pipeline.

[0056] In the present invention, when it is necessary to measure the pipeline liquid, the flow meter sensor 11 is placed in the fixed clamp 1, and the flow meter sensor 11 will push the pressure block 13 to squeeze the spring, so that the pressure block 13 generates a force on the flow meter sensor 11 to limit it under the action of the spring, and then the rotary valve 317 is rotated to drive the rotating rod 316 to rotate, so that the rotating rod 316 drives the crown gear 314 to rotate, so that the crown gear 314 is engaged with the spur gear 321, so that the spur gear 321 is engaged with the rack 21, and the spur gear 321 causes the fixed ring 32 to drive the movable clamp 3 to slide along the slide rod 2, so that the movable clamp 3 pushes the clamping member 34 to fit the pipeline surface during the movement, and the pipeline clamping is measured under the interaction force generated by the fixed clamp 1 and the clamping member 34.

[0057] Rotating the rotary valve 317 will cause the rotating block 3171 to drive the rotating groove 3172 to rotate coaxially, thereby causing the rotary valve 317 to drive the rotating rod 316 to rotate coaxially. The rotation of the rotating rod 316 will drive the crown gear 314 to rotate, so that the crown gear 314 will drive the ratchet 315 on the surface to rotate coaxially. Under the limiting action of the pawl 313, the crown gear 314 can only rotate in the counterclockwise direction, realizing the reverse locking of the crown gear 314. When the measurement is completed, the rotary valve 317 is pulled back. Since the sleeve 31 and the rotary valve 31 7 is a rotational connection, which causes the rotary valve 317 to pull the sleeve 31 to move backward, and the sleeve 31 will drive the block 311 to slide along the slot 3111. Since the sleeve 31 and the pawl 313 are rotationally connected, the sleeve 31 will drive the pawl 313 to move backward, and the pawl 313 will slide along the outer wall of the rotating rod 316, so that the pawl 313 releases the lock on the ratchet 315. At this time, the rotary valve 317 can be rotated in the opposite direction, so that the rotary valve 317 drives the movable clamp 3 to slide in the opposite direction along the slide rod 2, thereby releasing the clamp 3 from clamping the pipe.

[0058] The rotation of the spur gear 321 drives the pushing block 322 to rotate coaxially, and the pushing block 322 drives the push rod 331 to rotate coaxially, so that the push rod 331 drives the top block 33 to rotate along the inner wall of the movable clamp 3, and the push rod 331 moves upward under the action of the thread of the screw 332. At the same time, since the limit bar 333 is slidably connected to the slide bar 4, the limit bar 333 limits the screw rod 332, so that the screw 332 cannot rotate, so that the push rod 331 drives the top block 33 to push the movable clamp 3 to move upward, so that the movable clamp 3 drives the slide bar 2 to slide upward along the slide bar 4 , so that the movable clamp 3 can realize lateral movement to drive longitudinal movement. Since the two flow meter sensors 11 need to calculate the flow rate between the liquids through the distance between the two flow meter sensors 11 during the measurement process, the device locks the lateral and longitudinal ratio of the movable clamp 3 when sliding by setting the distance between the teeth. The distance between the two flow meter sensors 11 can be directly obtained by the diameter between the clamped pipes, so that the distance between the two flow meter sensors 11 does not need to be measured during the liquid flow measurement process, which facilitates subsequent measurement work.

[0059] When the clamping member 34 is in contact with the surface of the pipe, the clamping member 34 is energized. Since the clamping member 34 is made of metal that can undergo elastic deformation, the electrorheological fluid inside the clamping member 34 will solidify, causing the clamping member 34 to clamp the pipe surface tightly. At the same time, the suction cup 343 will adsorb the pipe surface, allowing the device to stably clamp the pipe during the measurement process.

[0060] When the clamping member 34 fits the surface of the pipe, continuously rotating the rotary valve 317 will cause the movable clamp 3 to squeeze the silicone block 341. When the pressure generated by the silicone block 341 on the internal spring is greater than the stiffness of the spring, the spring will undergo elastic deformation. At this time, the movable clamp 3 will cause the silicone block 341 to undergo elastic deformation. Since the movable clamp 3 will drive the spur gear 321 to move forward, the spur gear 321 will fit with the limit column 3411, thereby locking the spur gear 321, so that the device can automatically lock after generating a certain pressure during the clamping process, avoiding damage to the pipeline due to excessive clamping pressure.

[0061] The semiconductor refrigeration sheet 342 can heat or cool the clamp 34, and transfer heat to the pipe through the clamp 34, thereby heating or cooling the pipe, so that the device can simulate the changes in liquid flow at different temperatures during the measurement process, thereby improving the accuracy of the device's detection.

[0062] When the angle of the measured pipe is not a straight angle, the bolt 41 and the nut 42 are tightened to release the limit on the movable clamp 3. At this time, the rotary valve 317 is rotated to separate the push rod 331 and the screw 332. The push rod 331 will cause the movable clamp 3 to drive the slide bar 2 to slide upward along the slide bar 4, so that the slide bar 4 releases the limit on the slide bar 2. At the same time, the slide bar 2 will drive the fixed clamp 1 to slide coaxially. At this time, the device is split into two measuring components, which can measure different areas of the pipeline respectively, increasing the use scenarios of the device.

[0063] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An auxiliary clamp for online calibration of a liquid flow meter, comprising two sets of basic structures, wherein the basic structures comprise a fixed clamp (1), a slide bar (2) and a movable clamp (3), wherein the fixed clamp (1) is used to fix a flow meter sensor (11), the fixed clamp (1) is fixedly mounted on one end of the slide bar (2), the movable clamp (3) is slidably connected to the slide bar (2), the movable clamp (3) is used to fix a pipeline, and the movable clamp (3) is located at one end of the slide bar (2) away from the fixed clamp (1), and is characterized in that: The infrastructure also includes: A clamping mechanism, the clamping mechanism comprising a clamping member (34) fixedly mounted on one side of the movable clamp (3), the clamping member (34) being arc-shaped, the clamping member (34) being used to clamp the pipe, a plurality of suction cups (343) being fixedly mounted on one side of the clamping member (34) in contact with the pipe, the suction cups (343) being used to adsorb and fix the side wall of the pipe; A limiting mechanism, the limiting mechanism comprising a connecting piece (12) fixedly mounted inside the fixing clamp (1), the connecting piece (12) being rotatably connected to a pressure block (13), a spring being connected between the pressure block (13) and the fixing clamp (1), the pressure block (13) being used to fix the flow meter sensor (11), and a placement groove being provided inside the fixing clamp (1); A driving mechanism, the driving mechanism being located on a side of the movable clamp (3) away from the clamping member (34), the driving mechanism being used to drive the movable clamp (3) to move vertically and horizontally; A semiconductor refrigeration plate (342) is fixedly installed on the side of the clamping member (34) away from the pipeline, and the semiconductor refrigeration plate (342) is used to adjust the cooling capacity. The fixed clamp (1) is used to fix the position of the flow meter sensor (11). A silica gel block (341) is fixedly installed between the clamping member (34) and the movable clamp (3). The silica gel block (341) is used to reduce the pressure of the pipeline being clamped. A silica gel block (341) and a limiting column (3411) are fixedly installed on one end of the clamping member (34) close to the movable clamp (3). The silica gel block (341) is located around the clamping member (34), and the limiting column (3411) is located in the middle of the clamping member (34). The limiting column (3411) is used to fix the spur gear to stop rotating. A plurality of springs are fixedly installed between the clamping member (34) and the movable clamp (3). The driving mechanism comprises a rotating rod (316) installed through one end of the movable clamp (3); a pawl (313) is fixedly installed on one end of the rotating rod (316) located inside the movable clamp (3); the pawl (313) is rotatably connected to a ratchet (315); a crown gear (314) is fixedly installed on one end of the ratchet (315) away from the pawl (313); and the pawl (313) is used to drive the crown gear (314) to rotate. A fixing ring (32) and a fixing wheel (323) are installed inside the movable clamp (3), and a spur gear (321) is rotatably connected between the fixing ring (32) and the fixing wheel (323). The spur gear (321) is engaged with the crown gear (314), and the spur gear (321) is used to drive the fixing ring (32) and the fixing wheel (323) to rotate together; A rack (21) is fixedly mounted on one side of the slide bar (2) close to the spur gear (321), and the rack (21) is meshed with the spur gear (321). The spur gear (321) and the rack (21) are used to drive the movable clamp (3) to slide laterally on the slide bar (2); The movable clamp (3) is internally rotatably connected to a push rod (331), a top block (33) is fixedly installed on the top of the push rod (331), the top block (33) is located inside the movable clamp (3), the top block (33) is used to limit the rotation range of the push rod (331), the top block (33) is rotatably connected to the movable clamp (3), the push rod (331) is located at the center of the fixed ring (32), a plurality of push blocks (322) are fixedly installed on the side wall of the push rod (331), the push blocks (322) are located inside the spur gear (321), and the push blocks (322) are used to drive the push rod (331) to rotate; The invention also includes a position adjustment mechanism, which is used to fix and adjust the positions of the two sets of basic structures. The position adjustment mechanism includes a screw rod (332) rotatably connected to the push rod (331), and a limit bar (333) is fixedly installed at one end of the screw rod (332) away from the fixing ring (32). The limit bar (333) is used to limit the screw rod (332) from rotating. A slide bar (4) is installed at one end of the limit bar (333) away from the screw rod (332), and the limit bar (333) is located in the middle of the slide bar (4).

2. The auxiliary fixture for online calibration of a liquid flow meter according to claim 1, characterized in that: The end of the rotating rod (316) away from the fixed clamp (1) is rotatably connected to a sleeve (31), and the sleeve (31) passes through the movable clamp (3). A slot (3111) is provided on the side where the movable clamp (3) is connected to the sleeve (31), and the slot (3111) is located inside the movable clamp (3). A block (311) is installed on the sleeve (31), and the block (311) and the slot (3111) are used to limit the sleeve (31) from stopping rotation.

3. The auxiliary fixture for online calibration of a liquid flow meter according to claim 2, characterized in that: One end of the sleeve (31) away from the movable clamp (3) is slidably connected to a rotary valve (317), and the rotary valve (317) is used to rotate the rotating rod (316). A rotating groove (3172) is provided inside the rotary valve (317), and the rotating rod (316) extends through the sleeve (31) and enters the rotary valve (317). A rotating block (3171) is fixedly installed on the side wall of the rotating rod (316), and the rotating block (3171) is located inside the rotating groove (3172).

4. The auxiliary fixture for online calibration of a liquid flow meter according to claim 1, characterized in that: The slide bar (4) passes through the slide bar (2) and is slidably connected to the slide bar (2). Slide grooves are provided on both sides of the slide bar (4). The slide bar (2) moves up and down on the slide bar (4). The slide bar (4) is used to adjust the position of the movable clamp (3). Bolts (41) are installed at the upper and lower ends of the slide bar (4), and the bolts (41) are connected to nuts (42). The bolts (41) and nuts (42) are used to limit the position of the slide bar (2).

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