Flow meter measuring tube calibration machine

Abstract

The present invention belongs to the field of measurement and relates to a flowmeter measuring tube calibration machine, comprising a base, a pipe clamping mechanism, a pipe angle detection mechanism, and a spiral push-pull mechanism. The measuring tube to be calibrated is mounted on the base via the pipe clamping mechanism. The pipe angle detection mechanism acts on the measuring tube to be calibrated and detects its angle. The spiral push-pull mechanism acts on the measuring tube to be calibrated and pushes and pulls the measuring tube for correction based on the detection results of the pipe angle detection mechanism. This invention provides a flowmeter measuring tube calibration machine with high calibration efficiency and accuracy.

Description

Technical Field

[0001] The invention belongs to the field of measurement and relates to a calibration machine, in particular to a flow meter measuring tube calibration machine. Background Art

[0002] Currently, when calibrating a flow meter, the pipe is first measured manually, and then the pipe is repeatedly bent by manpower for calibration. This is not only time-consuming and labor-intensive, but also has poor pipe calibration accuracy due to the instability of manual operation. In addition, since the position of the hand is different after each measurement and observation, the position of the local deformation of the pipe wall is also different each time it is bent, which affects the natural frequency of the measuring pipe. In addition, the calibration errors of different workers on the same batch of measuring pipes are also quite different, resulting in poor consistency in the natural frequencies of the two measuring pipes on a flow meter. Therefore, an automated equipment is needed to solve these problems. Summary of the Invention

[0003] In order to solve the above technical problems existing in the background technology, the present invention provides a flow meter measuring tube calibrator with high calibration efficiency and high calibration accuracy.

[0004] In order to achieve the above object, the present invention adopts the following technical solutions:

[0005] A flow meter measuring tube calibration machine, characterized in that: the flow meter measuring tube calibration machine includes a base, a pipe clamping mechanism, a pipe angle detection mechanism and a spiral push-pull mechanism; the measuring tube to be calibrated is set on the base through the pipe clamping mechanism; the pipe angle detection mechanism acts on the measuring tube to be calibrated and detects the angle of the measuring tube to be calibrated; the spiral push-pull mechanism acts on the measuring tube to be calibrated and pushes and pulls the measuring tube to be calibrated for correction based on the detection result of the pipe angle detection mechanism.

[0006] The above-mentioned pipeline angle detection mechanism includes a shell, a detection component, a box body drive component and an indicating component; the box body drive component is movably arranged on the base; the detection component and the indicating component are arranged in parallel on the shell; the box body drive component is connected to the shell and drives the detection component to move axially along the detection component through the shell; the detection component can act on the measuring tube to be calibrated in a contact manner; the indicating component is connected to the detection component and indicates the angle detection result of the measuring tube to be calibrated.

[0007] The number of the above-mentioned indicating components corresponds to the number of the detecting components; there are multiple detecting components, and the multiple detecting components are arranged on the housing in a matrix manner.

[0008] The above-mentioned detection component includes a spring pressure plate, a spring and a detection rod; the detection rod is arranged on the shell along the axial direction of the spring through the spring pressure plate and the spring; the detection rod can act on the measuring tube to be calibrated in a contact manner; the indicating component includes a connecting rod, an indicating rod and a rotating shaft; the indicating rod and the detection rod are arranged in parallel on the shell; the indicating rod is a sliding rheostat; the axial direction of the rotating shaft is perpendicular to the axial direction of the detection rod; the connecting rod is mounted on the rotating shaft and rotates around the axial direction of the rotating shaft; one end of the connecting rod is connected to the detection rod, and the other end slides along the axial direction of the indicating rod; the box body driving component includes a third motor and a second screw; the third motor drives the shell and the detection rod to move along the axial direction of the detection rod through the second screw.

[0009] The above-mentioned detection component also includes a detection ball and a spring-moving guide tube; the detection ball is arranged at the end of the detection rod; the detection rod can act on the measuring tube to be calibrated in a contact manner through the detection ball; the spring-moving guide tube is arranged on the shell; the spring is arranged in the spring-moving guide tube along the axial direction of the spring-moving guide tube; the shell as a whole is a U-shaped groove; the pipeline angle detection mechanism also includes a cover plate arranged on the shell.

[0010] The above-mentioned spiral push-pull mechanism includes a second motor, a gear shaft, a spiral propeller, a spiral fixing ring and a C-shaped push-pull rod; the second motor is movably arranged on the base; the second motor is connected to the gear shaft and drives the gear shaft to rotate; the spiral fixing ring is movably arranged on the base; the spiral propeller is placed in the spiral fixing ring; the gear shaft is connected to the spiral propeller and drives the spiral propeller to rotate around the circumference of the spiral propeller; one end of the C-shaped push-pull rod acts on the measuring tube to be calibrated, and the other end is embedded in the spiral propeller; the second motor drives the C-shaped push-pull rod through the gear shaft and the spiral propeller to push and pull the measuring tube to be calibrated for correction.

[0011] A through hole is provided on the side wall of the above-mentioned spiral fixing ring, and a working window is provided along the axial direction of the spiral fixing ring; the gear shaft is placed in the working window along the axial direction of the working window and engages with the circumferential direction of the spiral propeller; a spiral propeller is provided with a spiral propulsion groove in the radial direction; the C-shaped push-pull rod extends into the spiral fixing ring from the through hole, and the end of the C-shaped push-pull rod is embedded in the spiral propulsion groove and moves in the spiral propulsion groove as the spiral propeller rotates.

[0012] The above-mentioned C-shaped push-pull rod includes a C-shaped groove, a semi-cylindrical connecting rod and a sliding ball; the C-shaped groove is buckled on the measuring tube to be calibrated; the C-shaped groove is connected to the sliding ball through the semi-cylindrical connecting rod; the semi-cylindrical connecting rod extends from the through hole into the spiral fixing ring; the sliding ball is embedded in the spiral propulsion groove and moves in the spiral propulsion groove as the spiral propeller rotates.

[0013] The above-mentioned pipe clamping mechanism includes a vertical pipe clamping mechanism and a horizontal pipe clamping mechanism with exactly the same structure; the number of the vertical pipe clamping mechanisms and the number of the horizontal pipe clamping mechanisms are both one or multiple groups; when the number of the vertical pipe clamping mechanisms and the number of the horizontal pipe clamping mechanisms are both multiple groups, the multiple groups of vertical pipe clamping mechanisms and the multiple groups of horizontal pipe clamping mechanisms are all distributed on the measuring pipe to be calibrated.

[0014] The above-mentioned vertical tube clamping mechanism includes a first clamping mechanism and a second clamping mechanism arranged symmetrically with the first clamping mechanism; the first clamping mechanism includes a first motor, a first screw and a slot block; the end face of the slot block is in contact with the wall of the measuring tube to be calibrated; the first motor is connected to the slot block through the first screw and drives the slot block to move along the axial direction of the first screw.

[0015] The advantages of the present invention are:

[0016] The present invention provides a flowmeter measuring tube calibration machine, comprising a base, a pipe clamping mechanism, a pipe angle detection mechanism, and a spiral push-pull mechanism; the measuring tube to be calibrated is arranged on the base via the pipe clamping mechanism; the pipe angle detection mechanism acts on the measuring tube to be calibrated and detects the angle of the measuring tube to be calibrated; the spiral push-pull mechanism acts on the measuring tube to be calibrated and pushes and pulls the measuring tube to be calibrated for correction based on the detection results of the pipe angle detection mechanism. The present invention can automate the calibration of flowmeter measuring tubes; improve the production capacity of flowmeter measuring tube calibration; achieve micron-level calibration of flowmeter measuring tubes; and achieve standardization of flowmeter measuring tube calibration, so that the products after calibration in this process have high consistency, the resulting local stress changes are more consistent than those produced by manual calibration, the natural frequencies of the measuring tubes are more similar, and the yield rate is higher. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the overall structure of the flow meter measuring tube calibration machine provided by the present invention;

[0018] Figure 2 This is a front view structural diagram of the flow meter measuring tube calibration machine provided by the present invention;

[0019] Figure 3 Schematic diagram of the structure of the electric propulsion mechanism used in the present invention;

[0020] Figure 4 It is a structural schematic diagram of the spiral push-pull mechanism adopted by the present invention;

[0021] Figure 5 1 is a front view structural diagram of the spiral push-pull mechanism adopted by the present invention;

[0022] Figure 6 It is a schematic structural diagram of the C-shaped push-pull rod used in the present invention;

[0023] Figure 7 Schematic diagram of the structure of the spiral fixing ring used in the present invention;

[0024] Figure 8 Schematic diagram of the structure of the screw propeller used in the present invention;

[0025] Figure 9 It is a structural schematic diagram of the pipeline angle detection mechanism adopted by the present invention;

[0026] Figure 10 1 is a schematic diagram of the top view of the pipeline angle detection mechanism used in the present invention;

[0027] in:

[0028] 1-base; 2-measuring tube to be calibrated; 3-vertical tube clamping mechanism; 31-first motor; 32-first screw; 33-groove block; 4-horizontal tube clamping mechanism; 5-screw push-pull mechanism; 51-second motor; 52-gear shaft; 53-screw propeller; 54-screw fixing ring; 55-C-type push-pull rod; 551-C-type groove; 552-semi-cylindrical connecting rod; 553-sliding ball; 6-pipeline angle detection mechanism; 61-third motor; 62-second screw; 63-indicator rod; 64-connecting rod; 65-rotating shaft; 66-spring pressure plate; 67-spring; 68-housing; 69-spring moving guide tube; 610-cover plate; 611-detection rod; 612-detection ball. DETAILED DESCRIPTION

[0029] See also Figure 1 as well as Figure 2 The present invention provides a flow meter measuring tube calibration machine, comprising a base 1, a pipe clamping mechanism, a pipe angle detection mechanism 6, and a spiral push-pull mechanism 5; the measuring tube 2 to be calibrated is arranged on the base 1 through the pipe clamping mechanism; the pipe angle detection mechanism 6 acts on the measuring tube 2 to be calibrated and detects the angle of the measuring tube 2 to be calibrated; the spiral push-pull mechanism 5 acts on the measuring tube 2 to be calibrated and pushes and pulls the measuring tube 2 to be calibrated for correction according to the detection result of the pipe angle detection mechanism 6.

[0030] See also Figure 2 、 Figure 9 as well as Figure 10The pipe angle detection mechanism 6 used in the present invention includes a housing 68, a detection component, a box drive, and an indicator component; the box drive is movably mounted on the base 1; the detection component and the indicator component are arranged in parallel on the housing 68; the box drive is connected to the housing 68 and drives the detection component to move axially through the housing 68; the detection component can contact the measuring tube 2 to be calibrated; the indicator component is connected to the detection component and indicates the angle detection result of the measuring tube 2 to be calibrated. The number of indicator components corresponds to the number of detection components; there are multiple detection components, and the multiple detection components are arranged in a matrix on the housing 68, see Figure 10 shown.

[0031] For example, see Figure 9 The detection components used in the present invention include a spring pressure plate 66, a spring 67 and a detection rod 611; the detection rod 611 is arranged on the housing 68 along the axial direction of the spring 67 through the spring pressure plate 66 and the spring 67; the detection rod 611 can act on the measuring tube 2 to be calibrated in a contact manner; the indicating component includes a connecting rod 64, an indicating rod 63 and a rotating shaft 65; the indicating rod 63 and the detection rod 611 are arranged in parallel on the housing 68; the indicating rod 63 is a sliding rheostat; the axial direction of the rotating shaft 65 is perpendicular to the axial direction of the detection rod 611; the connecting rod 64 is mounted on the rotating shaft 65 and rotates around the axial direction of the rotating shaft 65; one end of the connecting rod 64 is connected to the detection rod 611, and the other end slides along the axial direction of the indicating rod 63; the box body driving component includes a third motor 61 and a second screw 62; the third motor 61 drives the housing 68 and the detection rod 611 to move along the axial direction of the detection rod 611 through the second screw 62. In addition, the detection component also includes a detection ball 612 and a spring moving guide tube 69; the detection ball 612 is arranged at the end of the detection rod 611; the detection rod 611 can act on the measuring tube 2 to be calibrated in a contact manner through the detection ball 612; the spring moving guide tube 69 is arranged on the shell 68; the spring 67 is arranged in the spring moving guide tube 69 along the axial direction of the spring moving guide tube 69; the shell 68 as a whole is a U-shaped groove or a sinking groove structure with an upper opening; the pipeline angle detection mechanism 6 also includes a cover plate 610 arranged on the shell 68.

[0032] The indicator rod used in the present invention innovatively changes the traditional scale method to a sliding rheostat method. A sliding rheostat is generally composed of five parts, including a terminal, a slider, a resistance wire, a metal rod, and a porcelain tube. Its structure is a reflection of existing mature technology and will not be described in detail here. Among them, the resistance wire is the core component of the sliding rheostat, and is usually made of a material with a high melting point and high resistance, such as nickel-chromium alloy; the metal rod is made of a metal with low resistance to ensure that excessive resistance is not introduced when connected to the circuit. The resistance wire is wound on an insulating porcelain tube and coated with insulating paint to ensure the safety and stability of the circuit. The working principle of the sliding rheostat is to change the resistance value by changing the length of the resistance wire connected to the circuit, thereby controlling the current and voltage in the circuit. When the linkage rod 64 (slide) slides on the indicator rod, especially on the resistance wire, the length of the resistance wire connected to the circuit will change. According to the resistance law (R=ρL / A), the resistance value R is proportional to the length L of the resistance wire, so the resistance value will also change accordingly. Therefore, through a conventional or commonly used current detection circuit or voltage detection circuit, the current or voltage can be directly obtained, and then the length of the resistance wire can be inferred in reverse. Finally, the precise position of the linkage rod 64 on the indicator rod 63 is obtained, thereby achieving accurate measurement of the deformation of the measuring tube 2 to be calibrated.

[0033] The function of the probing ball 612 is to improve measurement accuracy. This is due to the fact that the contact angle between the probing rod 611 and the measuring tube 2 to be calibrated is random. Unlike any other geometric object, which cannot guarantee contact without sharp corners, contact at sharp corners would generate significant pressure on the measuring tube surface, creating indentations. Because the spring pressure applied to the probing rod 611 at different positions is inconsistent, the depth of the indentations varies, affecting measurement accuracy. However, the spherical surface has a larger and more consistent contact area with the measuring tube 2 to be calibrated, resulting in less pressure on the measuring tube 2 and smaller indentations, thus improving measurement accuracy.

[0034] Exemplarily, the third motor 61 is fixedly connected to the base 1, the second screw 62 is fixedly connected to the transmission shaft of the third motor 61, the housing 68 is threadedly connected to the second screw 62, the cover 610 is fixedly connected to the housing 68, two rows of spring movable guide tubes 69 are symmetrically arranged on the housing 68, one end of the spring 67 is fixedly set in the spring movable guide tube 69, and the other end is provided with a spring pressure plate 66, the detection rod 611 is fixedly connected to the spring pressure plate 66, the detection ball 612 is fixedly connected to the detection rod 611, one end of the connecting rod 64 is rotatably connected to the bottom of the detection rod 611, the middle part is slidably connected to the rotating shaft 65 near the detection rod 611, and the other end is slidably connected to the indicator rod 63, the rotating shaft 65 is rotatably connected to the housing 68, and the indicator rods 63 are symmetrically arranged in two rows on the housing. The purpose of arranging multiple groups of measuring rods on the same side of the pipeline angle detection mechanism adopted by the present invention is to simultaneously measure and analyze multiple groups of data and reduce measurement errors.

[0035] The pipeline angle detection mechanism 6 used in the present invention, especially the detection rod 611 and the indicator rod 63, uses the lever principle to amplify the measured distance. The displacement of the detection rod 611 can be obtained by combining a sliding rheostat and a conventional or commonly used current detection circuit or voltage detection circuit. Figure 9 as well as Figure 10 The method of using the pipe angle detection mechanism 6 is as follows: the housing 68 is pushed out by the second screw 62 under the action of the third motor 61, and multiple detection rods 611 are driven out by the housing 68. After they are pushed onto the measuring tube 2 to be calibrated, the detection rods 611 drive the connecting rod 64 to rotate and slide around the axial direction of the rotating shaft 65. The other end of the connecting rod 64 slides a certain distance on the indicator rod 63. The detection rods 611 at different locations extend to different lengths and slide on the indicator rod 63 to different distances. According to the Pythagorean theorem, the offset angle of the measuring tube 2 to be calibrated can be calculated. According to the offset angle, the spiral push-pull mechanism 5 can be used to act on the measuring tube 2 to be calibrated. The measuring tube 2 to be calibrated is repeatedly pushed and pulled until the offset angle is corrected. Figure 10 The purpose of setting up the matrix detection rod 611 in the present invention is to measure and analyze multiple groups of data at the same time, reduce measurement errors, make the measurement more accurate, and be more conducive to the push-pull action of the spiral push-pull mechanism 5. Exemplarily, the present invention uses two detection rods 611 on different sides, and the distance between the two is 100 mm. The distance between the rotating shaft 65 and the indicator rod 63 is 20 times the distance between the rotating shaft 65 and the detection rod 611, that is, the indicator rod 63 can amplify the displacement of the detection rod 611 by 20 times. If the detection rod produces a displacement of 0.01 mm (i.e. 10 microns), the displacement of the connecting rod 64 on the indicator rod 63 is 1 mm. At the same time, the minimum resolution of the sliding rheostat is set to 0.2 mm, that is, the diameter of the enameled wire of the sliding rheostat is 0.2 mm, that is, the pipeline angle detection mechanism 6 can detect an error of 0.01 mm (i.e. 10 microns) in a detection section of 100 mm, that is, the measurement accuracy on a measuring tube with a total length of 2000 mm is 0.2 mm, and the total length of most measuring tubes currently used on the market is less than 2000 mm. Obviously, the present invention can meet micron-level precision detection.

[0036] See also Figure 1 、 Figure 2 、 Figure 4 as well as Figure 5The screw push-pull mechanism 5 employed in the present invention includes a second motor 51, a gear shaft 52, a screw propeller 53, a screw fixing ring 54, and a C-shaped push-pull rod 55. The second motor 51 is movably mounted on the base 1. The second motor 51 is connected to the gear shaft 52 and drives the gear shaft 52 to rotate. The screw fixing ring 54 is movably mounted on the base 1. The screw propeller 53 is housed within the screw fixing ring 54. The gear shaft 52 is connected to the screw propeller 53 and drives the screw propeller 53 to rotate around the screw propeller 53. One end of the C-shaped push-pull rod 55 acts on the measuring tube 2 to be calibrated, and the other end is embedded in the screw propeller 53. The second motor 51 drives the C-shaped push-pull rod 55 via the gear shaft 52 and the screw propeller 53 to push and pull the measuring tube 2 to be calibrated. It should be noted that the diameter of the gear shaft is much smaller than that of the screw propeller.

[0037] The combination of the screw propeller and the gear shaft achieves a deceleration of the motor rotation due to the large difference in radius, thereby further amplifying the control accuracy of the motor. The screw propeller and the C-shaped push-pull rod are connected by a sliding connection of spherical and hemispherical grooves, which can make the C-shaped push-pull rod change linearly when it is extended and retracted. Its function is equivalent to an enlarged version of a threaded connection, but it has higher control accuracy than a screw-nut connection of the same size, thereby improving the push-pull accuracy of the measuring tube. In addition, the helix angle of the screw propeller is less than the equivalent friction angle of its sliding connection with the C-shaped push-pull rod, which satisfies the self-locking condition. The screw push-pull mechanism adopted by the present invention can achieve forward and reverse correction of the pipeline through the forward and reverse rotation of the screw propeller.

[0038] See also Figure 4 、 Figure 5 as well as Figure 7 The spiral fixing ring 54 used in the present invention has a through hole on its side wall and a working window along the axial direction of the spiral fixing ring 54; the gear shaft 52 is placed in the working window along the axial direction of the working window and meshes with the circumferential direction of the screw propeller 53; see Figure 8 a C-shaped push-pull rod 55 extends from the through hole into the spiral fixing ring 54, and the end of the C-shaped push-pull rod 55 is embedded in the spiral propulsion groove and moves in the spiral propulsion groove as the spiral propeller 53 rotates.

[0039] See also Figure 5 as well as Figure 6The C-shaped push-pull rod 55 used in the present invention includes a C-shaped groove 551, a semi-cylindrical connecting rod 552, and a sliding ball 553. The C-shaped groove 551 is engaged with the measuring tube 2 to be calibrated. The C-shaped groove 551 is connected to the sliding ball 553 via the semi-cylindrical connecting rod 552. The semi-cylindrical connecting rod 552 extends from the through hole into the spiral fixing ring 54. The sliding ball 553 is embedded in the spiral propulsion groove and moves in the spiral propulsion groove as the propeller 53 rotates. For example, the end of the C-shaped groove 551, especially the portion that engages or contacts the measuring tube 2 to be calibrated, is configured in a semicircular shape. Its function is to apply a uniform force to the wall of the measuring tube 2 to be calibrated, thereby minimizing the local deformation caused by the C-shaped groove 551 applying pressure to the wall, thereby improving the stability of the flowmeter.

[0040] See also Figure 1 as well as Figure 2 The pipe clamping mechanism includes a vertical pipe clamping mechanism 3 and a horizontal pipe clamping mechanism 4 of identical structure; the number of vertical pipe clamping mechanisms 3 and the number of horizontal pipe clamping mechanisms 4 are both one or more groups; when the number of vertical pipe clamping mechanisms 3 and the number of horizontal pipe clamping mechanisms 4 are both multiple groups, the multiple groups of vertical pipe clamping mechanisms 3 and the multiple groups of horizontal pipe clamping mechanisms 4 are all arranged on the measuring pipe 2 to be calibrated. It should be noted that, see Figure 2 When clamping the vertical section of the measuring tube 2 to be calibrated, two sets of vertical tube clamping mechanisms 3, located opposite each other, work together at the same vertical position. When clamping the horizontal tube, a set of horizontal tube clamping mechanisms 4 is directly used to act on the horizontal section of the measuring tube 2 to be calibrated. Taking the vertical tube clamping mechanism 3 as an example, it includes a first clamping mechanism and a second clamping mechanism symmetrically arranged with the first clamping mechanism; see Figure 3 The first clamping mechanism includes a first motor 31, a first screw 32, and a slot block 33; the end face of the slot block 33 fits against the wall of the measuring tube 2 to be calibrated. For example, the portion of the slot block in contact with the measuring tube can be set to a semicircular shape that fits against the tube wall. The purpose is to apply a uniform force to the semicircle of the tube wall, so that the local deformation caused by the slot block applying pressure to the tube wall is minimized, thereby improving the stability of the pipeline's influence on the flowmeter. The first motor 31 is connected to the slot block 33 through the first screw 32 and drives the slot block 33 to move along the axial direction of the first screw 32. The present invention can replace the current manual vise clamping method through electric propulsion, directly acting on the horizontal section or vertical section of the measuring tube 2 to be calibrated. At the same time, by utilizing the self-locking principle of the screw, both the horizontal tube clamping mechanism and the vertical tube clamping mechanism can effectively clamp without loosening.

[0041] The thread lead angle of all threaded connections in the present invention is less than the equivalent friction angle of the screw pair, thus satisfying the self-locking condition. The motors mentioned in the present invention are all servo motors. This invention replaces the current manual measurement method using a square ruler and visual observation, achieving automated measurement and resolving issues such as slow measurement speed, low measurement accuracy, and poor measurement stability.

[0042] See also Figure 1 When the flow meter measuring tube calibrator provided by the present invention is used, the measuring tube 2 to be calibrated is first placed into the groove formed by the various mechanisms (the midpoint of the measuring tube 2 to be calibrated does not need to be completely aligned with the center of the horizontal tube clamping mechanism 4, which helps to improve the operation speed). Then, the measuring tube 2 to be calibrated is fixed by the horizontal tube clamping mechanism 4. The pipeline angle detection mechanism 6 for detecting the angle of the vertical section of the measuring tube 2 to be calibrated detects whether the vertical section of the measuring tube 2 to be calibrated is within the set angle range. If not, the spiral push-pull mechanism 5 is started to adjust the measuring tube 2 to be calibrated. To calibrate the vertical section, the grooved block in the spiral push-pull mechanism 5 for vertical correction will push the measuring tube 2 to be calibrated in the opposite direction of the vertical direction by a certain distance. This distance is determined by the diameter, wall thickness and deviation angle of the measuring tube 2 to be calibrated. After correction, the grooved block will return to its original position, and the pipe angle detection mechanism 6 will re-detect the angle of the measuring tube 2 to be calibrated. If the detection is unqualified, the spiral push-pull mechanism 5 for vertical correction will continue to calibrate. After the correction, the pipe angle detection mechanism 6 will re-detect until it is qualified. After passing, the horizontal pipe clamping mechanism 4 will first be loosened, and the vertical pipe clamping mechanism 3 will re-clamp the measuring tube 2 to be calibrated. After clamping, the horizontally set pipe angle detection mechanism 6 will detect the horizontal section of the measuring tube 2 to be calibrated. If it is unqualified, the spiral push-pull mechanism 5 for horizontal correction will calibrate the horizontal section of the measuring tube 2 to be calibrated. After correction, it will be re-detected by the horizontally set pipe angle detection mechanism 6. If it is unqualified, correction will continue. If qualified, the vertical tube clamping mechanism 3 is released, and the calibration of the horizontal section of the measuring tube 2 to be calibrated is completed.

Claims

1. A flow meter measuring tube calibration machine, characterized in that: The flow meter measuring tube calibration machine comprises a base (1), a pipe clamping mechanism, a pipe angle detection mechanism (6), and a spiral push-pull mechanism (5); the measuring tube (2) to be calibrated is arranged on the base (1) via the pipe clamping mechanism; the pipe angle detection mechanism (6) acts on the measuring tube (2) to be calibrated and detects the angle of the measuring tube (2) to be calibrated; the spiral push-pull mechanism (5) acts on the measuring tube (2) to be calibrated and performs push-pull correction on the measuring tube (2) to be calibrated according to the detection result of the pipe angle detection mechanism (6); The pipeline angle detection mechanism (6) comprises a housing (68), a detection component, a box driving component, and an indicating component; the box driving component is movably arranged on a base (1); the detection component and the indicating component are arranged in parallel on the housing (68); the box driving component is connected to the housing (68) and drives the detection component to move along the axial direction of the detection component through the housing (68); the detection component can act on the measuring tube (2) to be calibrated in a contact manner; the indicating component is connected to the detection component and indicates the angle detection result of the measuring tube (2) to be calibrated; The number of the indicating components corresponds to the number of the detecting components; the detecting components are multiple, and the multiple detecting components are arranged on the housing (68) in a matrix manner; The detection component comprises a spring pressure plate (66), a spring (67) and a detection rod (611); the detection rod (611) is arranged on the housing (68) along the axial direction of the spring (67) through the spring pressure plate (66) and the spring (67); the detection rod (611) can act on the measuring tube (2) to be calibrated in a contact manner; the indicating component comprises a connecting rod (64), an indicating rod (63) and a rotating shaft (65); the indicating rod (63) and the detection rod (611) are arranged in parallel on the housing (68); the indicating rod (63) is a sliding rod. The variable resistor; the axial direction of the rotating shaft (65) is perpendicular to the axial direction of the detection rod (611); the connecting rod (64) is sleeved on the rotating shaft (65) and rotates around the axial direction of the rotating shaft (65); one end of the connecting rod (64) is connected to the detection rod (611), and the other end slides along the axial direction of the indicating rod (63); the box body driving member includes a third motor (61) and a second screw (62); the third motor (61) drives the housing (68) and the detection rod (611) to move along the axial direction of the detection rod (611) through the second screw (62); The detection component further comprises a detection ball (612) and a spring movable guide tube (69); the detection ball (612) is arranged at the end of a detection rod (611); the detection rod (611) can contact and act on the measuring tube (2) to be calibrated through the detection ball (612); the spring movable guide tube (69) is arranged on a housing (68); the spring (67) is arranged in the spring movable guide tube (69) along the axial direction of the spring movable guide tube (69); the housing (68) is in the form of a U-shaped groove as a whole; the pipeline angle detection mechanism (6) further comprises a cover plate (610) arranged on the housing (68).

2. The flow meter measuring tube calibrator according to claim 1, characterized in that: The spiral push-pull mechanism (5) comprises a second motor (51), a gear shaft (52), a screw propeller (53), a screw fixing ring (54) and a C-shaped push-pull rod (55); the second motor (51) is movably arranged on the base (1); the second motor (51) is connected to the gear shaft (52) and drives the gear shaft (52) to rotate; the spiral fixing ring (54) is movably arranged on the base (1); the screw propeller (53) is placed in the spiral fixing ring (54); the gear shaft (52) is connected to the screw propeller (53) and drives the screw propeller (53) to rotate around the circumference of the screw propeller (53); one end of the C-shaped push-pull rod (55) acts on the measuring tube (2) to be calibrated, and the other end is embedded in the screw propeller (53); the second motor (51) drives the C-shaped push-pull rod (55) through the gear shaft (52) and the screw propeller (53) to push and pull the measuring tube (2) to be calibrated.

3. The flow meter measuring tube calibrator according to claim 2, characterized in that: A through hole is provided on the side wall of the spiral fixing ring (54) and a working window is provided along the axial direction of the spiral fixing ring (54); the gear shaft (52) is placed in the working window along the axial direction of the working window and is circumferentially meshed with the screw propeller (53); a spiral propeller groove is provided in the radial direction of the screw propeller (53); the C-shaped push-pull rod (55) extends into the spiral fixing ring (54) from the through hole, and the end of the C-shaped push-pull rod (55) is embedded in the spiral propeller groove and moves in the spiral propeller groove as the screw propeller (53) rotates.

4. The flow meter measuring tube calibrator according to claim 3, characterized in that: The C-shaped push-pull rod (55) comprises a C-shaped groove (551), a semi-cylindrical connecting rod (552) and a sliding ball (553); the C-shaped groove (551) is buckled on the measuring tube (2) to be calibrated; the C-shaped groove (551) is connected to the sliding ball (553) through the semi-cylindrical connecting rod (552); the semi-cylindrical connecting rod (552) extends from the through hole into the spiral fixing ring (54); the sliding ball (553) is embedded in the spiral propulsion groove and moves in the spiral propulsion groove as the spiral propeller (53) rotates.

5. The flow meter measuring tube calibrator according to claim 4, characterized in that: The pipe clamping mechanism comprises a vertical pipe clamping mechanism (3) and a horizontal pipe clamping mechanism (4) of completely identical structure; the number of the vertical pipe clamping mechanisms (3) and the number of the horizontal pipe clamping mechanisms (4) are both one or multiple groups; when the number of the vertical pipe clamping mechanisms (3) and the number of the horizontal pipe clamping mechanisms (4) are both multiple groups, the multiple groups of vertical pipe clamping mechanisms (3) and the multiple groups of horizontal pipe clamping mechanisms (4) are all distributed on the measuring pipe (2) to be calibrated.

6. The flow meter measuring tube calibrator according to claim 5, characterized in that: The vertical tube clamping mechanism (3) comprises a first clamping mechanism and a second clamping mechanism symmetrically arranged with respect to the first clamping mechanism; the first clamping mechanism comprises a first motor (31), a first screw (32) and a slot block (33); the end face of the slot block (33) is in contact with the wall of the measuring tube (2) to be calibrated; the first motor (31) is connected to the slot block (33) via the first screw (32) and drives the slot block (33) to move along the axial direction of the first screw (32).

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