Water meter calibration device and method

Abstract

The present invention discloses a water meter calibration device and method, wherein a water meter calibration device comprises: a conveyor line, a plurality of meter clamps are arranged along the conveying direction on the conveyor line, the meter clamps are used to place fixed water meters, and when an external force acts on the water meter placed and fixed on the meter clamps, the water meter can move to separate from the meter clamps and move away from the conveyor line, so that when the direction of the external force is reversed, the water meter away from the conveyor line can move back to the meter clamps and resume fixed connection with the meter clamps. Beneficial effect: The water meter calibration device of the present application integrates the production line and the calibration equipment together, and the water meter is pushed away from the conveyor belt by the mobile calibration box group and is detachably plugged and sealed and fixedly connected to the mobile calibration box group and the fixed calibration box group, and then the water meter can be inspected for sealing and measurement accuracy.

Description

Technical Field

[0001] The present invention relates to the field of water meters, and in particular to a water meter calibration device and method. Background Art

[0002] As is known, water meters need to be inspected after being manufactured, and only those that pass the inspection can be shipped out of the factory for sale.

[0003] During the current water meter calibration, since the production line and calibration equipment for transporting water meters operate independently, it is necessary to rely on manual or automated transplanting equipment (such as robots) to transfer the water meters transported from the production line and install them on the meter clamping device of the water meter calibration equipment. Then, the water inlet and outlet of the water meter are sealed and connected with the corresponding pipe openings of the water meter calibration device. Specific sealing connection forms include threaded sealing, crimping sealing, plug-in sealing, etc. For specific calibration operation steps, please refer to patents such as CN212747996U, CN105865589B, CN221828745U, and CN114964428B. The above patents basically represent the main methods of current factory water meter calibration.

[0004] The inventors have discovered through research that it takes a certain amount of time for manual or automated transplanting equipment to transfer and install the water meters transported from the production line (including sealing and connecting the water inlet and outlet of the water meter with the corresponding pipe openings of the water meter calibration device after installation and fixation) onto the meter clamping device of the water meter calibration device. After the calibration is completed, manual or automated transplanting equipment is required to remove the water meter from the meter clamping device (specifically, first separate the water inlet and outlet of the water meter from the corresponding pipe openings of the water meter calibration device, and then remove the water meter from the meter clamping device) and put it back on the production line. After that, the subsequent water meters to be calibrated transported from the production line are transferred and installed on the meter clamping device of the water meter calibration device again. This process is repeated until all water meters have been calibrated. This calibration method has the problem that the transfer and disassembly process of the water meters is time-consuming and the calibration efficiency is low.

[0005] In addition, the water meter calibration standard clearly states that water meter calibration includes water meter sealing inspection and measurement accuracy inspection, and the two are equally important. However, the inventors found that most of the existing calibration methods only involve measurement accuracy inspection, and generally do not pay attention to sealing inspection. They simply rely on visual observation of whether there is water seepage on the water meter surface after the measurement accuracy inspection to judge the sealing of the water meter. This inspection method is rough, has poor detection accuracy, and is very easy to miss. Moreover, in the calibration methods disclosed in some patents, the water meter is not placed horizontally, which obviously does not meet the requirements of the water meter calibration operating procedures. Such a calibration operation method cannot guarantee the accuracy of the calibration results at all. Summary of the Invention

[0006] The main purpose of the present invention is to provide a water meter calibration device and method, aiming to solve the problems of low efficiency, incomplete and inaccurate calibration of existing water meters.

[0007] To solve the above problems, the present invention proposes a water meter calibration device, comprising:

[0008] A conveyor line is provided with a plurality of meter clamps arranged along the conveying direction. The meter clamps are used to place and fix water meters. When an external force acts on a water meter fixed on the meter clamp, the water meter can move away from the meter clamp and away from the conveyor line. When the direction of the external force is reversed, the water meter away from the conveyor line can move back to the meter clamp and resume fixed connection with the meter clamp.

[0009] The mobile calibration group and the fixed calibration group are respectively arranged on both sides of the conveying line, the fixed calibration group includes an upstream calibration tube, the mobile calibration group includes a downstream calibration tube and a moving device for driving the downstream calibration tube to move back and forth, the moving device is used to drive the downstream calibration tube to move in the reverse direction so that the downstream calibration tube is first fixedly connected to the detachable plug-in seal of the pipe joint 2 of the water meter placed and fixed on the meter clamp, and then drives the water meter to continue to move in the reverse direction so that the water meter is separated from the meter clamp and away from the conveying line, and finally the pipe joint 1 of the water meter is fixedly connected to the detachable plug-in seal of the upstream calibration tube; the moving device is also used to drive the downstream calibration tube to move forward so that the pipe joint 1 is first separated from the upstream calibration tube, and then drives the water meter to continue to move forward to return to the meter clamp and resume fixed connection with the meter clamp, and finally separate the downstream calibration tube from the pipe joint 2; the downstream calibration tube is provided with a control valve and a standard meter;

[0010] A reading device, used for reading the measurement value detected by the water meter;

[0011] The water leakage photographing device is used to photograph the surface of the water meter which is detachably plugged and sealed and fixedly connected to the upstream calibration tube, and identify the water leakage point.

[0012] In one embodiment, the meter holder includes:

[0013] The device base is fixedly connected to the conveying line;

[0014] A pair of limit blocks are spaced apart and symmetrically arranged on the base, and the pair of limit blocks define a limit channel for the translation of the water supply meter on the base. A rear retaining wall and a stop block are provided on the side of the limit block facing the limit channel. The stop block is elastically connected to the limit block, and the elastic expansion and contraction direction is the direction of the limit channel pointing to the limit block. After the water meter translates forward into the limit channel, the stop block is first squeezed to make the water meter pass between the pair of stop blocks, and then the water meter continues to translate in the same direction and conflicts with the rear retaining wall. The pair of limit blocks push the water meter to maintain pressure conflict with the rear retaining wall, so that the water meter is clamped and fixed in the limit channel by the pair of limit blocks and the rear retaining wall; the water meter translates in the opposite direction to squeeze the stop block to make the water meter pass between the pair of stop blocks and leave the limit channel.

[0015] In one embodiment, the meter holder includes:

[0016] A U-shaped cover is fixedly connected to the conveying line, and the water meter can slide in and out of the U-shaped cover;

[0017] The limit column is fixed in the U-shaped cover to prevent the water meter from sliding;

[0018] The stopper is arranged in the U-shaped cover and is elastically connected to the U-shaped cover, and the elastic expansion and contraction direction is the direction from the inner wall of the U-shaped cover to the outer wall. After the water meter moves forward into the U-shaped cover, the stopper is squeezed first so that the water meter can continue to move in the same direction. After the water meter contacts the limit column, the stopper pushes the water meter to maintain pressure contact with the limit column, thereby clamping the water meter in the U-shaped cover through the limit column and the stopper; the water meter moves backward and squeezes the stopper so that the water meter can continue to move in the same direction and leave the U-shaped cover.

[0019] In one embodiment, the stopper is provided with a first front stopper wall and a second front stopper wall. When the water meter is clamped and fixed, the second front stopper wall contacts the water meter with pressure. When the water meter moves forward into the meter clamp, the first front stopper wall contacts the water meter before the second front stopper wall.

[0020] The included angle between the front baffle wall 1 and the translation direction of the water meter is smaller than the included angle between the front baffle wall 2 and the translation direction of the water meter.

[0021] In one embodiment, an inner wall of one end of the downstream test tube is sealed with an elastic sealing ring 1, and an inner wall of one end of the upstream test tube is sealed with an elastic sealing ring 2, the inner diameters of the elastic sealing ring 1 and the elastic sealing ring 2 are zero, and the outer circumferential surface of the elastic sealing ring 2 is provided with a groove;

[0022] The downstream calibration tube moves in the reverse direction so that pipe joint 2 passes through elastic sealing ring 1 to expand the inner diameter of elastic sealing ring 1 and seals and fixes elastic sealing ring 1 to pipe joint 2, and so that pipe joint 1 passes through elastic sealing ring 2 to expand the inner diameter of elastic sealing ring 2 and seals and fixes elastic sealing ring 2 to pipe joint 1.

[0023] In one embodiment, the conveying line is a belt conveyor, which is configured to have several conveying sections and calibration sections. The conveying sections are used to convey water meters, and the calibration sections are used to calibrate water meters. The meter clamp is installed on the conveyor belt, and the conveyor belt drives the meter clamp to move between the conveying section and the calibration section. The water meter on the meter clamp located in the calibration section can be detachably plugged and sealed and fixed to the downstream calibration tube and the upstream calibration tube.

[0024] In one embodiment, the conveyor belts of the inspection section and at least part of the conveying section have different inclination angles, the water meter of the inspection section is arranged horizontally, and the movement direction of the moving device is horizontal movement.

[0025] In one embodiment, a roller shaft is provided under the conveyor belt, a roller is rotatably mounted on the roller shaft, and the roller is rollingly connected to the lower surface of the conveyor belt. The inclination angles of the rollers under the conveyor belt in the inspection section and at least part of the conveying section are different. The inclination angle of the conveyor belt can be adjusted by changing the inclination angle of the roller.

[0026] In one embodiment, the reading device is located directly above the water meter which is detachably plugged and sealed and fixedly connected to the upstream calibration tube;

[0027] The water leakage shooting devices are symmetrically arranged on both sides below the water meter which is detachably plugged and sealed and fixedly connected to the upstream calibration pipe.

[0028] In addition, the present invention also proposes a water meter calibration method, which uses any of the above-mentioned water meter calibration devices to perform the following steps:

[0029] S1. The water meter is transported between the mobile calibration group and the fixed calibration group through the conveying line, and then the conveying line stops moving;

[0030] S2. Control the moving device to drive the downstream calibration tube to move in the reverse direction so that the downstream calibration tube is first connected to the second pipe joint of the water meter fixed on the meter clamp through a detachable plug-in seal, then drive the water meter to continue moving in the reverse direction so that the water meter is separated from the meter clamp and away from the conveying line, and finally the first pipe joint of the water meter is connected to the upstream calibration tube through a detachable plug-in seal;

[0031] S3. Pour water into the upstream test tube. The water flows through the water meter and the downstream test tube in sequence, thereby exhausting the air in the upstream test tube, water meter and downstream test tube.

[0032] S4. Close the control valve to stop the downstream test pipe from draining water. Then, check the water meter for tightness. After a while, use a water leakage camera to photograph the surface of the water meter and identify the leaking point.

[0033] S5. Open the control valve to apply a constant water inlet pressure to the upstream calibration pipe to check the metering accuracy of the water meter. After a period of time, obtain the measured values ​​of the water meter and the standard meter, and compare them to obtain the indication error of the tested water meter;

[0034] S6. Stop injecting water into the upstream test tube, drive the downstream test tube to move forward to first separate the pipe joint 1 from the upstream test tube, then drive the water meter to continue moving forward to return to the meter clamp and restore the fixed connection with the meter clamp, finally separate the downstream test tube from the pipe joint 2;

[0035] S7. The conveyor line continues to move, and the inspected water meters are sent away through the conveyor line, and the subsequent water meters to be inspected are transported between the mobile inspection group and the fixed inspection group, and S2-S6 are repeated.

[0036] Beneficial effects: The water meter calibration device of the present application integrates the production line and calibration equipment together, and pushes the water meter to move away from the conveyor belt through the mobile calibration box group and the fixed calibration box group through detachable plug-in seals. Then the water meter can be checked for sealing and measurement accuracy. After the calibration is completed, the mobile calibration box group drives the water meter to separate from the fixed calibration box group and the mobile calibration box group in turn, and resets the water meter on the conveyor belt. The subsequent conveyor belt can continue to transport the water meter. In this way, the water meter can be fully automated for assembly line calibration, and there is no need to spend too much time on the transfer and disassembly of the water meter, which greatly improves the calibration speed and efficiency, and the calibration is comprehensive and accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0038] Figure 1 This is a schematic diagram of the structure of a water meter calibration device of the present invention. Figure 1 ;

[0039] Figure 2 yes Figure 1 A magnified view of part A in FIG;

[0040] Figure 3 This is a schematic diagram of the structure of a water meter calibration device of the present invention. Figure 2 ;

[0041] Figure 4 It is a top view of a water meter calibration device of the present invention;

[0042] Figure 5This is a schematic diagram of a water meter calibration device of the present invention after removing the mobile calibration group Figure 1 ;

[0043] Figure 6 This is a schematic diagram of a water meter calibration device of the present invention after removing the mobile calibration group Figure 2 ;

[0044] Figure 7 yes Figure 6 A magnified view of part B in FIG;

[0045] Figure 8 This is a schematic diagram of the water meter before and after being plugged, sealed, and fixedly connected to the upstream and downstream calibration tubes. Figure 8 (a) is a schematic diagram of the water meter before it is plugged in, sealed, and fixedly connected to the upstream and downstream calibration tubes. Figure 8 Middle (b) is a schematic diagram of the water meter after being plugged, sealed, and fixedly connected to the upstream and downstream calibration tubes;

[0046] Figure 9 This is a schematic diagram of a meter clamp in one embodiment. Figure 1 ;

[0047] Figure 10 This is a schematic diagram of a meter clamp in one embodiment. Figure 2 ;

[0048] Figure 11 This is a schematic diagram of a meter clamp in one embodiment. Figure 3 ;

[0049] Figure 12 This is a schematic diagram of another embodiment of the meter clamp Figure 1 ;

[0050] Figure 13 This is a schematic diagram of another embodiment of the meter clamp Figure 2 .

[0051] The following are the descriptions of the reference numerals:

[0052] 1. Conveyor belt; 11. Conveying section; 12. Verification section;

[0053] 2. Water meter; 21. Pipe joint 1; 22. Pipe joint 2; 23. Meter case; 24. Meter cover;

[0054] 3. Meter clamp; 31. Meter base; 32. Limit block; 33. Limit channel; 34. Rear baffle; 35. Stop block; 36. Spring; 37. Chamber; 38. Front baffle 1; 39. Front baffle 2;

[0055] 4. Detection assembly; 41. Hanging rod; 42. Mounting bracket 1; 43. Reading device; 44. Mounting plate; 45. Infrared thermal imager;

[0056] 5. Support and stabilization equipment; 51. Crossbar; 52. Roller; 53. Roller; 54. Support legs;

[0057] 6. Roller frame 1; 61. Roller 1;

[0058] 7. Roller stand 2; 71. Roller 2;

[0059] 8. Mobile calibration group; 81. Mobile device; 82. Downstream water tank; 83. Water receiving container; 84. Downstream calibration pipe; 85. Water collecting pipe; 86. Control valve; 87. Standard gauge; 88. Elastic sealing ring (1); 89. Limit ring (1);

[0060] 9. Fixed calibration group; 91. Upstream water tank; 92. Upstream calibration tube; 93. Elastic sealing ring 2; 94. Limiting ring 2; 95. Groove;

[0061] 100. Heating device;

[0062] 200, return pipe;

[0063] 301. U-shaped cover; 302. Limiting column. DETAILED DESCRIPTION

[0064] The present invention proposes a water meter calibration device, which integrates the production line and calibration equipment. The water meter 2 is pushed away from the conveyor belt 1 by the mobile calibration box group and is detachably plugged and sealed and fixedly connected to the mobile calibration box group and the fixed calibration box group. Then the water meter 2 can be checked for sealing and measurement accuracy. After the calibration is completed, the mobile calibration box group drives the water meter 2 to separate from the fixed calibration box group and the mobile calibration box group in turn, and resets the water meter 2 on the conveyor belt 1. The conveyor belt 1 can continue to transport the water meter 2. In this way, the water meter 2 can be fully automatically calibrated on the assembly line without spending too much time on the transfer and disassembly process of the water meter 2, which greatly improves the calibration speed and efficiency, and the calibration is comprehensive and accurate.

[0065] Specifically, in one embodiment of the invention, Figures 1-6 As shown, the water meter calibration device includes: a conveyor line, a mobile calibration group 8 and a fixed calibration group 9, a reading device 43, and a water leakage shooting device. A plurality of meter clamps 3 are arranged along the conveying direction on the conveyor line. The conveying direction of the conveyor line is as follows: Figure 1 As shown by the arrow in the middle, the conveyor line can be a common conveying equipment such as a belt conveyor, a chain conveyor, or a plate conveyor. Figures 1-6 What is shown is a belt conveyor, in which case the watch clamp 3 is fixedly connected to the conveyor belt 1 .

[0066] In this embodiment, the meter clamp 3 is used to place and fix the water meter 2, and when an external force acts on the water meter 2 placed and fixed on the meter clamp 3, the water meter 2 can move away from the meter clamp 3 and away from the transmission line. When the direction of the external force is reversed, the water meter 2 away from the transmission line can move back to the meter clamp 3 and resume fixed connection with the meter clamp 3. For example, when the meter clamp 3 is Figure 2 、 Figures 9-11 In the structure shown, the meter clamp 3 includes: a base 31, a pair of limit blocks 32, the base 31 is fixedly connected to the conveyor line; a pair of limit blocks 32 are spaced and symmetrically arranged on the base 31, and a pair of limit blocks 32 define a limit channel 33 for the translation of the water supply meter 2 on the base 31, and a rear retaining wall 34 and a stop block 35 are provided on the side of the limit block 32 facing the limit channel 33. The stop block 35 is elastically connected to the limit block 32, and the elastic expansion and contraction direction is the direction of the limit channel 33 pointing to the limit block 32, for example Figure 11 As shown, a chamber 37 is provided on the limit block 32 , in which a spring 36 and a stop block 35 are installed. The stop block 35 slides in the chamber 37 , and the sliding direction is the direction in which the limit channel 33 points to the limit block 32 , and the stop block 35 slides and squeezes the spring 36 . Figure 9 The direction indicated by the middle arrow is the forward translation direction of the water meter 2. After the water meter 2 translates forward into the limiting channel 33, the block 35 is squeezed first to make the water meter 2 pass between the pair of blocks 35. After the block 35 is pressurized, it retracts into the chamber 37 and compresses the spring 36. Then the water meter 2 continues to translate in the same direction and contacts the rear retaining wall 34. The existence of the rear retaining wall 34 prevents the water meter 2 from continuing to translate forward after contacting the rear retaining wall 34. At this time, the pair of limit blocks 32 extend out of the chamber 37 under the action of the compressed spring 36, and push the water meter 2 to maintain pressure contact with the rear retaining wall 34, so that the water meter 2 is clamped and fixed in the limiting channel 33 by the pair of limit blocks 32 and the rear retaining wall 34. Figure 2 Similarly, the water meter 2 translates in the opposite direction to squeeze the stopper 35, causing the water meter 2 to pass between the pair of stops 35 and exit the limiting passage 33. Of course, in other embodiments, the stopper 35 can also be connected to the spring 36 of the limit block 32 without the aid of the chamber 37 and the spring 36. For example, a guide rod can be provided along the sliding direction of the stopper 35 to replace the chamber 37 to guide the stopper 35 and ensure smooth sliding of the stopper 35. The spring 36 can be replaced by an elastic element such as a torsion spring or an elastic paddle. In this way, the stopper 35 can be elastically connected to the limit block 32, and the elastic expansion and contraction direction is the direction from the limit passage 33 to the limit block 32.

[0067] In addition, when the clamp 3 is Figure 12-13 In the structure shown, the meter clamp 3 includes: a U-shaped cover 301, a limiting column 302, and a stopper 35. The U-shaped cover 301 is fixedly connected to the conveyor line. Figure 12-13The U-shaped cover 301 is inverted and fixedly connected to the conveying line. The water meter 2 can slide in and out of the U-shaped cover 301; the limiting column 302 is fixedly set in the U-shaped cover 301 to prevent the water meter 2 from sliding; the stopper 35 is set in the U-shaped cover 301 and elastically connected to the U-shaped cover 301, and the elastic expansion direction is the direction from the inner wall of the U-shaped cover 301 to the outer wall. The specific structure of the stopper 35 and the specific elastic connection form with the U-shaped cover 301 are the same as the specific connection form of the stopper 35 and the limiting block 32 in the meter clamp 3 of the aforementioned embodiment. The water meter 2 is in the forward translation direction as shown in FIG. Figure 13 As shown by the middle arrow, after the water meter 2 moves forward and enters the U-shaped cover 301, it first squeezes the stopper 35 so that the water meter 2 can continue to move in the same direction. After the water meter 2 contacts the limit column 302, the stopper 35 pushes the water meter 2 to maintain pressure contact with the limit column 302, thereby clamping the water meter 2 in the U-shaped cover 301 through the limit column 302 and the stopper 35; the water meter 2 moves backward and squeezes the stopper 35 so that the water meter 2 can continue to move in the same direction and leave the U-shaped cover 301.

[0068] The meter clamp 3 of the above two specific structures can both be used to place and fix the water meter 2, and when an external force acts on the water meter 2 placed and fixed on the meter clamp 3, the water meter 2 can move away from the meter clamp 3 and away from the conveying line. When the direction of the external force is reversed, the water meter 2 away from the conveying line can move back to the meter clamp 3 and resume fixed connection with the meter clamp 3.

[0069] Further, such as Figures 9-11As shown, the block 35 is provided with a first front barrier wall 38 and a second front barrier wall 39. When the water meter 2 is clamped and secured, the second front barrier wall 39 and the water meter 2 come into pressure-resistance contact. Pressure-resistance refers to contact between the second front barrier wall 39 and the water meter 2, with contact pressure being applied therebetween. During the forward translation of the water meter 2 into the meter clamp 3, the first front barrier wall 38 comes into contact with the water meter 2 before the second front barrier wall 39. The angle between the front baffle wall 1 38 and the translation direction of the water meter 2 is smaller than the angle between the front baffle wall 2 39 and the translation direction of the water meter 2. With this design, the resistance of the front baffle wall 1 38 to the water meter 2 during the forward translation of the water meter 2 into the meter clamp 3 is smaller than the resistance of the front baffle wall 2 39 to the water meter 2 during the reverse translation of the water meter 2 out of the meter clamp 3. The small resistance of the front baffle wall 1 38 to the water meter 2 ensures that the downstream calibration tube 84 and the pipe joint 2 22 of the water meter 2 will not separate when the downstream calibration tube 84 pulls the water meter 2 to squeeze the block 35 and allows the water meter 2 to pass through a pair of blocks 35. The front baffle wall 2 39 has a greater resistance to the water meter 2, ensuring that the pipe joint 2 22 and the downstream calibration tube 84 are simultaneously plugged, sealed and fixedly connected in the process of the downstream calibration tube 84 pushing the water meter 2 to leave the meter clamp 3, and the situation where the water meter 2 is not plugged, sealed and fixedly connected to the downstream calibration tube 84 after the downstream calibration tube 84 pushes the water meter 2 to leave the meter clamp 3 does not occur.

[0070] In this embodiment, if Figure 1 、 Figure 3-Figure 4 As shown, the mobile inspection group 8 and the fixed inspection group 9 are respectively arranged on both sides of the conveying line. The fixed calibration group 9 includes at least an upstream calibration tube 92, and the movable calibration group 8 includes at least a downstream calibration tube 84 and a movable device 81 for driving the downstream calibration tube 84 to move back and forth. The movable device 81 is used to drive the downstream calibration tube 84 to move in the opposite direction so that the downstream calibration tube 84 is first detachably plugged and sealed and fixedly connected to the pipe joint 2 22 of the water meter 2 placed and fixed on the meter clamp 3, and then push the water meter 2 to continue to move in the opposite direction so that the water meter 2 is separated from the meter clamp 3 and away from the conveying line, and finally the pipe joint 1 21 of the water meter 2 is detachably plugged and sealed and fixedly connected to the upstream calibration tube 92. After the water meter 2 completes the comprehensive calibration operation, the movable device 81 is also used to drive the downstream calibration tube 84 to move forward so that the pipe joint 1 21 is first separated from the upstream calibration tube 92, and then drive the water meter 2 to continue to move forward and return to the meter clamp 3 and resume fixed connection with the meter clamp 3, and finally separate the downstream calibration tube 84 from the pipe joint 2 22.

[0071] In this embodiment, a control valve 86 and a standard meter 87 are provided on the downstream calibration tube 84. The control valve 86 is used to control the downstream calibration tube 84 to close and stop the water discharge, thereby facilitating the sealing inspection of the water meter 2. The standard meter 87 is used to obtain the standard water flow rate flowing through the water meter 2. The standard meter 87 method uses the measurement value of the standard meter 87 as a comparison benchmark and directly compares it with the measurement value of the water meter 2 to obtain the indication error of the inspected water meter 2, thereby verifying the metering performance of the water meter 2 and completing the metering accuracy inspection of the water meter 2. The measurement value of the water meter 2 can be read manually or automatically by a reading device 43 instead of manual reading. The reading device 43 is used to read the measurement value detected by the water meter 2. Common reading devices 43 include cameras, laser positioning and aiming detection devices, etc.

[0072] Further, such as Figure 1 、 Figure 3-Figure 4 As shown, the fixed calibration group 9 also includes an upstream water tank 91, in which the calibration water is pre-stored. The upstream calibration tube 92 is fixed and connected to the upstream water tank 91. Furthermore, in order to improve the calibration efficiency, one upstream water tank 91 can be installed with multiple upstream calibration tubes 92 so that multiple water meters 2 can be calibrated at the same time. Similarly, the mobile calibration group 8 also includes a downstream water tank 82. The water flowing out of the downstream calibration tube 84 is stored in the downstream water tank 82, and then the water in the downstream water tank 82 is pumped back to the upstream water tank 91 through the return pipe 200 by a water pump, thereby realizing the recycling of the calibration water. At this time, the downstream calibration tube 84 is fixed and connected to the downstream water tank 82. In order to improve the calibration efficiency, one downstream water tank 82 can be installed with multiple downstream calibration tubes 84 so that multiple water meters 2 can be calibrated at the same time. Accordingly, each downstream test pipe 84 needs to be installed with a standard gauge 87 and a control valve 86. To reduce the number of control valves 86 and lower costs, a single header pipe 85 can be provided to connect multiple downstream test pipes 84, and then a single control valve 86 can be installed on the header pipe 85. This design can save costs for the control valves 86. The downstream water tank 82 is connected to the moving device 81, which drives the downstream water tank 82 to move horizontally.

[0073] Furthermore, the mobile test group 8 also includes a water receiving container 83, such as Figure 1 、 Figure 3-Figure 4 As shown, the water receiving container 83 is located below the upstream calibration tube 92 and the downstream calibration tube 84, and is connected to the moving device 81. The water receiving container 83 is driven to move horizontally by the moving device 81. The water leaked during the separation process of the upstream calibration tube 92, the water meter 2, and the downstream calibration tube 84 that are plugged and sealed and fixedly connected, as well as the water remaining in the water meter 2 can all fall into the water receiving container 83 for recycling and reuse, thereby avoiding waste of water resources.

[0074] Specifically, one of the specific forms in which the water meter 2 is detachably plugged, sealed, and fixedly connected to the upstream test tube 92 and the downstream test tube 84 is as follows: Figure 7 and Figure 8 As shown, the inner wall of one end of the downstream test tube 84 is sealed with an elastic sealing ring 1 88, and the inner wall of one end of the upstream test tube 92 is sealed with an elastic sealing ring 2 93. The inner diameters of the elastic sealing ring 1 88 and the elastic sealing ring 2 93 are zero. This design makes the upstream test tube 92 and the downstream test tube 84 in a normally closed state. Even if there is water stored in the upstream water tank 91, the upstream test tube 92 will not leak the water. The downstream test tube 84 moves in the opposite direction to make the pipe joint 2 22 pass through the elastic sealing ring 1 88 to expand the inner diameter of the elastic sealing ring 1 88 and make the elastic sealing ring 1 88 and the pipe joint 2 22 plug-in sealed and fixedly connected, and make the pipe joint 1 21 pass through the elastic sealing ring 2 93 to expand the inner diameter of the elastic sealing ring 2 93 and make the elastic sealing ring 2 93 and the pipe joint 1 21 plug-in sealed and fixedly connected. In short, the water meter 2 is not connected with the upstream test tube 92 and the downstream test tube 92. When the pipe 84 is plugged in, the inner diameter of the sealing ring 1 and the elastic sealing ring 2 93 is zero, so that the upstream calibration tube 92 and the downstream calibration tube 84 are in a normally closed state to prevent the upstream calibration tube 92 and the downstream calibration tube 84 from leaking. When the water meter 2 needs to be plugged in and connected with the upstream calibration tube 92 and the downstream calibration tube 84, the pipe joint 2 22 is passed through the elastic sealing ring 1 88 to expand the inner diameter of the elastic sealing ring 1 88 and make the elastic sealing ring 1 88 plugged in and sealed and fixedly connected to the pipe joint 2 22, and the pipe joint 1 21 is passed through the elastic sealing ring 2 93 to expand the inner diameter of the elastic sealing ring 2 93 and make the elastic sealing ring 2 93 plugged in and sealed and fixedly connected to the pipe joint 1 21. The elasticity of the elastic sealing ring 1 88 and the elastic sealing ring 2 93 can effectively seal the connection between themselves and the pipe joint to prevent water leakage. Commonly, the material of the elastic sealing ring 1 88 and the elastic sealing ring 2 93 is rubber. Similarly, after the elastic sealing ring is separated from the pipe joint, the elastic sealing ring can promptly restore its inner diameter to zero, so that the upstream test tube 92 and the downstream test tube 84 return to the normally closed state to avoid water leakage.

[0075] In this embodiment, if Figure 8 As shown, the outer circumferential surface of the elastic sealing ring 2 93 is provided with a groove 95. The design of the groove 95 can reduce the extrusion force of the elastic sealing ring 2 93 on the pipe joint 1 21. When the pipe joint 1 21 is inserted and penetrated through the elastic sealing ring 2 93, the elastic sealing ring 2 93 will squeeze and occupy the space of the groove 95, thereby preventing the elastic sealing ring 2 93 from being severely squeezed by the pipe joint 1 21. When the pipe joint 22 is inserted and penetrated through the elastic sealing ring 1 88, due to the absence of the groove 95, the elastic sealing ring 2 93 will be severely squeezed by the pipe joint 2 22, and the extrusion force between the pipe joint 22 and the elastic sealing ring 1 88 is relatively large. With this design, Figure 8The middle and downstream calibration tube 84 pulls the water meter 2 to the right, which can separate the pipe joint 21 and the elastic sealing ring 2 93, while the pipe joint 2 22 and the elastic sealing ring 1 88 remain reliably plugged and sealed and fixedly connected without separation, thereby ensuring that the water meter 2 can be driven to return to the meter clamp 3 smoothly through the downstream calibration tube 84.

[0076] Further, such as Figure 8 As shown, a limiting ring 2 94 is provided on the inner wall of the pipe mouth of the upstream calibration tube 92, and a limiting ring 1 89 is provided on the inner wall of the pipe mouth of the downstream calibration tube 84. The inner diameters of the limiting ring 1 89 and the limiting ring 2 94 are equal to the outer diameters of the corresponding positions of the pipe joints of the water meter 2. This design ensures that after the pipe joint 2 22 and the downstream calibration tube 84 are plugged in and sealed and fixedly connected, the pipe joint 2 22 and the downstream calibration tube 84 are coaxial, and the pipe joint 1 21 will not drop and cause the water meter 2 to tilt. Accordingly, the upstream calibration tube 92 can be set at a position coaxial with the downstream calibration tube 84, and there is no need to spend a long time adjusting the position of the upstream calibration tube 92. Of course, in other embodiments, the limit ring may not be provided, and the inner diameter of the pipe openings of the upstream calibration tube 92 and the downstream calibration tube 84 may be designed to be equal to the outer diameter of the corresponding position of the pipe joint of the water meter 2. In this way, after the pipe joint 22 and the downstream calibration tube 84 are plugged in and sealed and fixedly connected, the pipe joint 22 and the downstream calibration tube 84 are coaxial, and the pipe joint 1 21 will not drop and cause the water meter 2 to tilt. The upstream calibration tube 92 can also be set at a position coaxial with the downstream calibration tube 84. Of course, if no limiting rings are set in the pipe openings of the upstream calibration tube 92 and the downstream calibration tube 84, or the inner diameters of the pipe openings of the upstream calibration tube 92 and the downstream calibration tube 84 are not designed to be equal to the outer diameters of the corresponding positions of the pipe joints of the water meter 2, then after the pipe joint 22 is plugged in and sealed and fixedly connected to the downstream calibration tube 84, the pipe joint 1 21 will drop slightly, causing the water meter 2 to tilt slightly. Accordingly, in order to ensure that the subsequent pipe joint 1 21 can be smoothly plugged in and sealed and fixedly connected to the upstream calibration tube 92, the position of the upstream calibration tube 92 needs to be lowered. This adjustment process takes time, which is not conducive to the efficient assembly of the water meter calibration device.

[0077] Typically, the water meter 2 includes a case 23 and a cover 24. The cover 24 is detachably sealed and fixedly mounted on the upper end of the case 23. The case 23 and the pipe joint 1 21 and the pipe joint 2 22 are integrally cast. There is no water leakage problem. The only possible water leakage is at the connection between the case 23 and the cover 24. Therefore, the water leakage shooting device shoots the connection between the case 23 and the cover 24. In addition, the outer diameter of the cover 24 is usually large. Therefore, if you want to shoot the connection between the case 23 and the cover 24, you need to set the water leakage shooting device at a position not higher than the connection between the case 23 and the cover 24. In this embodiment, the water leakage shooting device is set below the water meter 2. Figure 1 、 Figure 3 and Figure 4 As shown, this design facilitates the arrangement of the water leakage photographing device and avoids the possible influence on the movement of the water meter 2. The water leakage photographing device of this embodiment is used to photograph the surface of the water meter 2 that is detachably plugged and sealed and fixedly connected to the upstream calibration tube 92, and to identify the water leakage point. This design can avoid the water leakage that may exist at the connection between the pipe joint 21 and the upstream calibration tube 92 when the water meter 2 is separated from the upstream calibration tube 92, flowing onto the meter case 23 and affecting the accurate identification of the water leakage point. Therefore, the water leakage photographing device should be photographed before the pipe joint 21 and the upstream calibration tube 92 are separated. Therefore, as Figure 1 、 Figure 3 and Figure 4 As shown, the water leakage photographing device is symmetrically arranged on both sides below the water meter 2 which is detachably plugged and sealed and fixedly connected to the upstream calibration tube 92. This design allows photographing before the pipe joint 21 and the upstream calibration tube 92 are separated, and ensures that all areas of the connection between the meter case 23 and the meter cover 24 are photographed. Of course, there are also some water meters 2 whose meter covers 24 are located at the bottom of the meter case 23, and the meter case 23 and the pipe joint 1 21 and the pipe joint 2 22 are welded together. In this case, arranging the water leakage photographing device below the water meter 2 can also photograph the bottom of the meter case 23 and the connection between the meter case 23 and the pipe joint 1 21 and the pipe joint 2 22. Therefore, arranging the water leakage photographing device below the water meter 2 can meet the calibration requirements of various types of water meters 2.

[0078] In this embodiment, if Figure 1 、 Figure 3 and Figure 4 As shown, the leak camera is fixedly mounted on a mounting plate 44, symmetrically arranged on either side of the mounting plate 44. The mounting plate 44 is fixedly connected to a mounting frame 1 42, which is fixedly connected to a hanging rod 41, which is fixedly connected to an upstream water tank 91. Furthermore, the reading device 43 can also be mounted and fixed to the mounting frame 1 42, fully utilizing the mounting space on the mounting frame 1 42. The leak camera and the reading device 43, together with the mounting frame 1 42, form a detection assembly 4, which detects the readings and leaks measured by the water meter 2. The reading device 43 is located directly above the water meter 2, which is removably plugged and sealed to the upstream calibration tube 92.

[0079] In this embodiment, the water leakage shooting device is a visual camera or an infrared thermal imager 45, preferably an infrared thermal imager 45. The infrared thermal imager 45 captures the water seepage area through temperature difference (water evaporation absorbs heat, causing the surface temperature to drop), and can detect hidden leakage. The infrared thermal imager 45 is used to scan the water meter 2, observe the temperature distribution image, and accurately identify the hidden leakage point.

[0080] Further, such as Figure 1 、 Figure 3 and Figure 4 As shown, a heating device 100 is provided on the conveyor line, and the heating device 100 is used to heat the water meter 2 to be inspected so that the water meter 2 has a suitable temperature. Subsequently, water is passed into the water meter 2. If there is water leakage, the water meter 2 with a certain temperature can accelerate the evaporation of the leaked water, making the surface temperature distribution image of the water meter 2 clearer and more intuitive, making it easier to find hidden leakage points, reducing the difficulty of the infrared thermal imager 45 in identifying hidden leakage points, and improving the quality of the sealing inspection of the water meter 2.

[0081] In this embodiment, if Figure 3 and Figure 5 As shown, the belt conveyor is configured to have several conveying sections 11 and a calibration section 12. The conveying section 11 is used to convey water meters 2, and the calibration section 12 is used to calibrate the water meters 2. The meter clamp 3 is installed on the conveyor belt 1, and the conveyor belt 1 drives the meter clamp 3 to move between the conveying section 11 and the calibration section 12. The water meter 2 on the meter clamp 3 in the calibration section 12 can be removably plugged into and sealed and fixedly connected to the downstream calibration tube 84 and the upstream calibration tube 92. The inclination angles of the conveyor belt 1 of the calibration section 12 and at least part of the conveying section 11 are different. The at least part of the conveying section 11 includes the following three situations: the entire conveying section 11, several conveying sections 11, and a portion of a certain conveying section 11. The water meter 2 of the calibration section 12 is arranged horizontally, and the movement direction of the moving device 81 is horizontal movement. Accordingly, the water meter 2 on the conveyor belt 1 of at least part of the conveying section 11 is arranged at an angle. This design facilitates the tilting of the water meter 2 to discharge the residual water in the water meter 2 after the calibration of the water meter 2 is completed. The horizontal arrangement of the water meter 2 in the calibration section 12 facilitates the moving device 81 to drive the downstream calibration tube 84 to move and be fixedly connected with the upstream calibration tube 92 and the water meter 2 in a detachable plug-in seal.

[0082] In this embodiment, the different inclination angles of the conveyor belt 1 in the inspection section 12 and at least part of the conveying section 11 can be achieved in the following manner: Figure 5 and Figure 6 As shown, a roller shaft 52 is provided below the conveyor belt 1, and a roller 53 is rotatably mounted on the roller shaft 52. The roller 53 is connected to the lower surface of the conveyor belt 1 in a rolling manner. The roller 53 below the conveyor belt 1 in the inspection section 12 and at least part of the conveying section 11 has different inclination angles. Changing the inclination angle of the roller 53 can adjust the inclination angle of the corresponding conveyor belt 1. In addition, another function of the roller 53 is to support the conveyor belt 1 so that the conveyor belt 1 can transport multiple water meters 2 smoothly and safely. Figure 5 and Figure 6 In the middle, the clamp 3 adopts Figures 9-11 As shown in the structure, the conveyor belt 1 of the test section 12 is tilted so that the corresponding water meter 2 is horizontal, and the conveyor belt 1 of the conveying section 11 is horizontal so that the corresponding water meter 2 is tilted. Figure 12-13In the structure shown, the conveyor belt 1 is tilted, and the corresponding water meter 2 is also tilted. When the conveyor belt 1 is horizontal, the corresponding water meter 2 is also horizontal. However, considering the long-term stable and safe transportation of the conveyor belt 1, it is preferred that the conveyor belt 1 in the conveying section 11 is horizontal and the conveyor belt 1 in the inspection section 12 is tilted.

[0083] In this embodiment, if Figure 5 and Figure 6 As shown, a plurality of rollers 52 are fixedly mounted on a crossbar 51 , and the crossbar 51 is fixed to the ground via a plurality of legs 54 , thereby forming a supporting and stabilizing device 5 for supporting the conveyor belt 1 .

[0084] Furthermore, in order to make the conveyor belt 1 with different inclination angles transition smoothly and avoid abnormal jumping affecting the transportation safety of the water meter 2, as shown in FIG. Figure 1 、 Figure 5 and Figure 6 As shown, roller frame 16 and roller frame 27 are provided at the connection between the inspection section 12 and the conveying section 11. Roller frame 16 and roller frame 27 are fixedly connected to the mounting frame 1 42. Roller frame 16 is installed with roller 161, and roller frame 27 is installed with roller 271. Roller 161 rolls close to the upper surface of the conveyor belt 1, and roller 271 rolls close to the lower surface of the conveyor belt 1. The conveyor belts 1 with different inclination angles are smoothly transitioned by roller 161 and roller 271 to avoid abnormal jumping that affects the transportation safety of the water meter 2.

[0085] In addition, the present invention also proposes a water meter calibration method, which uses any of the above-mentioned water meter calibration devices to perform the following steps:

[0086] S1. The water meter 2 is transported to the calibration position between the mobile calibration group 8 and the fixed calibration group 9 via the conveyor line, so that the pipe joint of the water meter 2 is aligned with the downstream calibration tube 84 and the upstream calibration tube 92, and then the conveyor line is suspended;

[0087] S2. Control the moving device 81 to drive the downstream verification tube 84 to move in the reverse direction so that the downstream verification tube 84 is first connected to the pipe joint 2 22 of the water meter 2 fixed on the meter clamp 3 in a detachable, plug-in, and sealed manner. Then, the water meter 2 is driven to continue to move in the reverse direction so that the water meter 2 is separated from the meter clamp 3 and away from the conveyor line. Finally, the pipe joint 1 21 of the water meter 2 is connected to the upstream verification tube 92 in a detachable, plug-in, and sealed manner. The purpose of moving the water meter 2 away from the conveyor line is to facilitate the subsequent infrared thermal imager 45 installed below the water meter 2 to photograph the water meter 2, so as to avoid the conveyor belt 1 blocking the photographing line.

[0088] S3. Fill the upstream calibration tube 92 with water. The water flows through the water meter 2 and the downstream calibration tube 84 in sequence, thereby exhausting the air in the upstream calibration tube 92, the water meter 2, and the downstream calibration tube 84 to ensure the quality of subsequent calibration.

[0089] S4. Close the control valve 86 to stop the downstream test pipe 84 from draining water. Keep the upstream test pipe 92 unobstructed. Then, check the water meter 2 for leaks. After a while, use a water leakage camera to photograph the surface of the water meter 2 to identify the leaking point. The water leakage camera is connected to a computer, and the photographic information is transmitted to the computer in real time. Therefore, the computer can clearly determine which water meters 2 on the conveyor belt 1 have leaking problems.

[0090] S5. Open the control valve 86 to apply a constant water inlet pressure to the upstream calibration pipe 92 to check the measurement accuracy of the water meter 2. After a period of time, the measurement values ​​detected by the water meter 2 and the standard meter 87 are obtained and compared to obtain the indication error of the water meter 2 under test. The obtained measurement values ​​detected by the water meter 2 and the standard meter 87 are transmitted to the computer in real time, and the computer analyzes, processes and compares them to obtain the indication error of the water meter 2 under test. Therefore, the computer can clearly determine which water meters 2 on the conveyor belt 1 have failed the calibration.

[0091] S6. Stop injecting water into the upstream test tube 92, drive the downstream test tube 84 forward to first separate the pipe joint 1 21 from the upstream test tube 92, then drive the water meter 2 to continue moving forward to return to the meter clamp 3 and restore the fixed connection with the meter clamp 3, and finally separate the downstream test tube 84 from the pipe joint 2 22. If the upstream test tube 92 itself is a normally closed design, such as an elastic sealing ring 2 93 with an inner diameter of zero is provided in the upstream test tube 92, the downstream test tube 84 can be directly driven forward to first separate the pipe joint 1 21 from the upstream test tube 92 without stopping injecting water into the upstream test tube 92;

[0092] S7. The conveyor line continues to move, and the inspected water meter 2 is sent away through the conveyor line, and the subsequent water meter 2 to be inspected is transported to between the mobile inspection group 8 and the fixed inspection group 9, and S2-S6 are repeated.

[0093] The above description is only a preferred embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made by using the contents of the present invention description and drawings under the inventive concept of the present invention, or direct / indirect application in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A water meter calibration device, characterized in that: include: A conveyor line is provided with a plurality of meter clamps arranged along the conveying direction. The meter clamps are used to place and fix water meters. When an external force acts on a water meter fixed on the meter clamp, the water meter can move away from the meter clamp and away from the conveyor line. When the direction of the external force is reversed, the water meter away from the conveyor line can move back to the meter clamp and resume fixed connection with the meter clamp. The mobile calibration group and the fixed calibration group are respectively arranged on both sides of the conveying line, the fixed calibration group includes an upstream calibration tube, the mobile calibration group includes a downstream calibration tube and a moving device for driving the downstream calibration tube to move back and forth, the moving device is used to drive the downstream calibration tube to move in the reverse direction so that the downstream calibration tube is first fixedly connected to the detachable plug-in seal of the pipe joint 2 of the water meter placed and fixed on the meter clamp, and then drives the water meter to continue to move in the reverse direction so that the water meter is separated from the meter clamp and away from the conveying line, and finally the pipe joint 1 of the water meter is fixedly connected to the detachable plug-in seal of the upstream calibration tube; the moving device is also used to drive the downstream calibration tube to move forward so that the pipe joint 1 is first separated from the upstream calibration tube, and then drives the water meter to continue to move forward to return to the meter clamp and resume fixed connection with the meter clamp, and finally separate the downstream calibration tube from the pipe joint 2; the downstream calibration tube is provided with a control valve and a standard meter; A reading device, used for reading the measurement value detected by the water meter; A water leakage photographing device is used to photograph the surface of the water meter that is detachably plugged and sealed and fixedly connected to the upstream calibration tube, and identify the water leakage point; The conveyor line is a belt conveyor, which is configured to have several conveying sections and verification sections. The conveying sections are used to convey water meters, and the verification sections are used to verify water meters. The meter clamp is installed on the conveyor belt and is driven by the conveyor belt to move between the conveying section and the verification section. The water meter on the meter clamp in the verification section can be detachably plugged and sealed and fixedly connected to the downstream verification tube and the upstream verification tube; The conveyor belts of the inspection section and at least part of the conveying section have different inclination angles, the water meter of the inspection section is arranged horizontally, and the movement direction of the moving device is horizontal movement; The water leakage shooting devices are symmetrically arranged on both sides below the water meter which is detachably plugged and sealed and fixedly connected to the upstream calibration pipe.

2. A water meter calibration device according to claim 1, characterized in that: The meter clamp comprises: The device base is fixedly connected to the conveying line; A pair of limit blocks are spaced apart and symmetrically arranged on the base, and the pair of limit blocks define a limit channel for the translation of the water supply meter on the base. A rear retaining wall and a stop block are provided on the side of the limit block facing the limit channel. The stop block is elastically connected to the limit block, and the elastic expansion and contraction direction is the direction of the limit channel pointing to the limit block. After the water meter translates forward into the limit channel, the stop block is first squeezed to make the water meter pass between the pair of stop blocks, and then the water meter continues to translate in the same direction and conflicts with the rear retaining wall. The pair of limit blocks push the water meter to maintain pressure conflict with the rear retaining wall, so that the water meter is clamped and fixed in the limit channel by the pair of limit blocks and the rear retaining wall; the water meter translates in the opposite direction to squeeze the stop block to make the water meter pass between the pair of stop blocks and leave the limit channel.

3. A water meter calibration device according to claim 1, characterized in that: The meter clamp comprises: A U-shaped cover is fixedly connected to the conveying line, and the water meter can slide in and out of the U-shaped cover; The limit column is fixed in the U-shaped cover to prevent the water meter from sliding; The stopper is arranged in the U-shaped cover and is elastically connected to the U-shaped cover, and the elastic expansion and contraction direction is the direction from the inner wall of the U-shaped cover to the outer wall. After the water meter moves forward into the U-shaped cover, the stopper is squeezed first so that the water meter can continue to move in the same direction. After the water meter contacts the limit column, the stopper pushes the water meter to maintain pressure contact with the limit column, thereby clamping the water meter in the U-shaped cover through the limit column and the stopper; the water meter moves backward and squeezes the stopper so that the water meter can continue to move in the same direction and leave the U-shaped cover.

4. A water meter calibration device according to claim 2 or 3, characterized in that: The stopper is provided with a front stopper wall 1 and a front stopper wall 2. When the water meter is clamped and fixed, the front stopper wall 2 contacts the water meter with pressure. When the water meter moves forward into the meter clamp, the front stopper wall 1 contacts the water meter before the front stopper wall 2. The included angle between the first front baffle wall and the translation direction of the water meter is smaller than the included angle between the second front baffle wall and the translation direction of the water meter.

5. A water meter calibration device according to claim 1, characterized in that: An elastic sealing ring 1 is sealed to the inner wall of one end of the downstream test tube, and an elastic sealing ring 2 is sealed to the inner wall of one end of the upstream test tube. The inner diameters of the elastic sealing ring 1 and the elastic sealing ring 2 are zero, and a groove is provided on the outer circumference of the elastic sealing ring 2. The downstream calibration tube moves in the reverse direction so that pipe joint 2 passes through elastic sealing ring 1 to expand the inner diameter of elastic sealing ring 1 and seals and fixes elastic sealing ring 1 to pipe joint 2, and so that pipe joint 1 passes through elastic sealing ring 2 to expand the inner diameter of elastic sealing ring 2 and seals and fixes elastic sealing ring 2 to pipe joint 1.

6. A water meter calibration device according to claim 1, characterized in that: A roller shaft is provided under the conveyor belt, and a roller is rotatably mounted on the roller shaft. The roller is rollingly connected to the lower surface of the conveyor belt. The inclination angles of the rollers under the conveyor belt in the inspection section and at least part of the conveying section are different. The inclination angle of the conveyor belt can be adjusted by changing the inclination angle of the roller.

7. A water meter calibration device according to claim 1, characterized in that: The reading device is located just above the water meter which is detachably plugged and sealed and fixedly connected to the upstream calibration tube.

8. A water meter calibration method, characterized in that: The water meter calibration device according to any one of claims 1 to 7 is used to perform the following steps: S1. The water meter is transported between the mobile calibration group and the fixed calibration group through the conveying line, and then the conveying line stops moving; S2. Control the moving device to drive the downstream calibration tube to move in the reverse direction so that the downstream calibration tube is first connected to the second pipe joint of the water meter fixed on the meter clamp through a detachable plug-in seal, then drive the water meter to continue moving in the reverse direction so that the water meter is separated from the meter clamp and away from the conveying line, and finally the first pipe joint of the water meter is connected to the upstream calibration tube through a detachable plug-in seal; S3. Pour water into the upstream test tube. The water flows through the water meter and the downstream test tube in sequence, thereby exhausting the air in the upstream test tube, water meter and downstream test tube. S4. Close the control valve to stop the downstream test pipe from draining water. Then, check the water meter for tightness. After a while, use a water leakage camera to photograph the surface of the water meter and identify the leaking point. S5. Open the control valve to apply a constant water inlet pressure to the upstream calibration pipe to check the metering accuracy of the water meter. After a period of time, obtain the measured values ​​of the water meter and the standard meter, and compare them to obtain the indication error of the tested water meter; S6. Stop injecting water into the upstream test tube, drive the downstream test tube to move forward to first separate the pipe joint 1 from the upstream test tube, then drive the water meter to continue moving forward to return to the meter clamp and restore the fixed connection with the meter clamp, finally separate the downstream test tube from the pipe joint 2; S7. The conveyor line continues to move, and the inspected water meters are sent away through the conveyor line, and the subsequent water meters to be inspected are transported between the mobile inspection group and the fixed inspection group, and S2-S6 are repeated.

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