Pressure gauge calibration equipment and calibration method thereof

Abstract

The invention relates to pressure gauge calibration equipment and a calibration method thereof, and relates to the technical field of pressure gauges. The device comprises a workbench and a pressure generator, the pressure generator is arranged on the workbench, a standard device and a detected pressure gauge are arranged on the workbench, the detected pressure gauge comprises a cover body, a spring tube, a transmission assembly, a pointer and a dial, the cover body is arranged on the workbench, the spring tube is arranged in the cover body, one end of the spring tube is fixed with the cover body, and the other end of the spring tube is connected with the transmission assembly. The pointer is connected with the transmission assembly, the dial is arranged on the cover body, the transmission assembly is used for driving the pointer to rotate on the dial, the pressure generator is communicated with the spring tube through the pressure guide pipe and the standard device, an adjusting mechanism is arranged on the cover body, the adjusting mechanism is connected with the transmission assembly, and the adjusting mechanism is used for driving the transmission assembly to move so as to change the rotating angle of the pointer. According to the invention, the internal structure of the pressure gauge can be adjusted conveniently, so that the pressure gauge can be calibrated conveniently.

Description

Technical Field

[0001] The present application relates to the field of pressure gauges, and in particular to a pressure gauge calibration device and a calibration method thereof. Background Art

[0002] A pressure gauge is an industrial instrument used to measure pressure. In order to ensure that the measurement value of the pressure gauge is sufficiently accurate and feasible, it is necessary to calibrate the pressure gauge regularly or irregularly using a pressure calibrator.

[0003] During the calibration process, the pressure gauge to be calibrated and the standard instrument need to be connected to the same pressure source, and the pressure source is used to provide the same calibration pressure for the pressure gauge to be calibrated and the standard instrument. When the calibration pressure is stable, the measured pressure values ​​are obtained from the pressure gauge to be calibrated and the standard instrument respectively. The deviation of the measured pressure values ​​of the two indicates the measurement deviation of the pressure gauge to be calibrated, and based on this, it can be judged whether the pressure gauge to be calibrated has sufficient accuracy.

[0004] When there is a deviation in the value, the calibrated pressure gauge needs to be removed from the pipeline, and then the entire pressure gauge needs to be disassembled and the components adjusted to achieve calibration. The adjusted pressure gauge is then installed back on the pipeline and the above steps are continued. The calibration process of the pressure gauge requires the continuous disassembly of the entire pressure gauge, which makes the operation inconvenient and needs to be improved. Summary of the Invention

[0005] In order to improve the problem that when calibrating a pressure gauge, the entire pressure gauge needs to be disassembled to adjust the components therein, resulting in inconvenient operation, the present application provides a pressure gauge calibration device and a calibration method thereof.

[0006] In the first aspect, the present application provides a pressure gauge calibration device that adopts the following technical solution: A pressure gauge calibration device includes a workbench and a pressure generator, the pressure generator is arranged on the workbench, a standard and a pressure gauge to be tested are provided on the workbench, the pressure gauge to be tested includes a cover body, a spring tube, a transmission assembly, a pointer and a dial, the cover body is arranged on the workbench, the spring tube is arranged in the cover body, one end of the spring tube is fixed to the cover body, and the other end is connected to the transmission assembly, the pointer is connected to the transmission assembly, the dial is arranged on the cover body, the transmission assembly is used to drive the pointer to rotate on the dial, the pressure generator is connected to the standard and the spring tube through a pressure conduit, the pressure generator is used to change the pressure of the pressure gauge to be tested and the standard, an adjustment mechanism is provided on the cover body, the adjustment mechanism is connected to the transmission assembly, and the adjustment mechanism is used to drive the transmission assembly to move to change the rotation angle of the pointer.

[0007] By adopting the above technical solution, when in use, first install the standard instrument and the pressure gauge to be tested on the workbench and connect them to the pressure conduit. Then start the pressure generator and provide the same pressure to the standard instrument and the pressure gauge to be tested through the pressure conduit at the same time. Observe the value on the standard instrument. During this process, the spring tube is deformed under pressure, driving the transmission assembly to move, causing the pointer to rotate. Observe whether the value pointed to by the pointer on the dial is consistent with that on the standard instrument.

[0008] If there is a deviation, the adjustment mechanism is directly driven on the outside of the pressure gauge under test, that is, on the cover body, to drive the transmission assembly to move, so that when the spring tube moves the same distance, the angle of the pointer is driven to change through the transmission assembly, so that when the pressure gauge under test and the standard instrument are subjected to the same pressure, the value pointed by the pointer is consistent with that on the standard instrument, thereby realizing the calibration of the pressure gauge under test. In this process, the transmission assembly can be adjusted without disassembling the entire pressure gauge. The pressure gauge calibration can be completed on the outside of the pressure gauge while ensuring the integrity of the pressure gauge, which is more convenient to operate.

[0009] Optionally, the transmission assembly includes a pull rod, a sector gear and a rotating gear, one end of the pull rod is hinged to the free end of the spring tube, and the other end is hinged to the sector gear, the sector gear is rotatably connected to the cover body via a rotating shaft, the rotating gear is rotatably connected at the center of the cover body, the sector gear is meshed with the rotating gear, and the pointer is coaxially fixed with the rotating gear.

[0010] By adopting the above technical solution, when the pressure generator is started, the pressure enters the spring tube through the pressure conduit, causing the spring tube to deform, driving one end of the pull rod to move, causing the pull rod to rotate and move with the fan gear, and the fan gear is positioned on the cover body, so that the fan gear deflects around the rotating shaft, driving the rotating gear to rotate, and driving the pointer to rotate on the dial, so that the pointer points to the corresponding pressure value.

[0011] Optionally, the adjustment mechanism includes an adjustment component and a driving member, the adjustment component is provided on the sector gear, the adjustment component is connected to the end of the pull rod away from the spring tube, the rotation of the adjustment component is used to drive the pull rod to move toward or away from the rotating shaft, the driving member is provided on the cover body, the driving member is connected to the adjustment component, and is used to drive the adjustment component to rotate.

[0012] By adopting this technical solution, when the value indicated by the pointer deviates from that on the standard, the driver is activated, driving the adjustment assembly to rotate and change the position of the end of the pull rod on the sector gear. If the value on the pressure gauge under test is smaller than that on the standard, the pull rod is adjusted toward the rotating shaft. If the value on the pressure gauge under test is larger than that on the standard, the pull rod is adjusted away from the rotating shaft. This ensures that the standard and the pressure gauge under test display the same value under the same pressure, thus completing the calibration of the pressure gauge under test.

[0013] Optionally, the adjustment assembly includes an adjustment plate, a conveyor belt and an adjustment block, the adjustment plate is fixed to the sector gear, the adjustment plate is arranged along the diameter direction of the sector gear, the conveyor belt is provided on the adjustment plate, the conveyor belt is arranged along the length direction of the adjustment plate, the adjustment plate is provided with an adjustment groove along the length direction of the adjustment plate, two positioning blocks are provided on the conveyor belt, the positioning blocks are inserted in the adjustment groove, the conveyor belt rotates to drive the two positioning blocks to move simultaneously toward or away from the rotating shaft, the adjustment block is provided between the two positioning blocks, and the end of the pull rod is hinged to the adjustment block.

[0014] By adopting the above technical solution, when adjusting the pressure gauge under test, the driving part is rotated to rotate the conveyor belt, so that the two positioning blocks move in the same direction in the adjustment groove at the same time, so as to push the adjustment block to move in the adjustment groove, change the distance from the pull rod to the rotating shaft, and utilize the lever principle to make the spring tube be subjected to the same pressure, driving the end of the pull rod connected to the spring tube to move the same distance, while the distance that the other end of the pull rod drives the adjustment plate to move changes, thereby changing the deflection angle of the sector gear, realizing the adjustment of the rotation angle of the pointer, and completing the calibration of the pressure gauge under test.

[0015] Optionally, the driving member includes a driving rod, which is coaxially fixed on the driving wheel of the conveyor belt, and the driving rod extends out of the cover body. A slide groove is provided on the side wall of the cover body, and the driving rod passes through the slide groove and moves in the slide groove. An adjustment chamber is fixed on the side wall of the cover body, and one side of the adjustment chamber is open and hinged with a cover plate for closing the opening, and the slide groove is located in the adjustment chamber.

[0016] By adopting the above technical solution, when adjusting the pressure gauge under inspection, the cover is opened and the driving rod is directly rotated to drive the driving wheel of the conveyor belt to rotate, so that the entire conveyor belt rotates, thereby causing the positioning block to drive the adjustment block to move, thereby adjusting the position of the adjustment block. When the pull rod moves the same distance, the rotation angle of the sector gear is driven to be adjusted.

[0017] When the spring tube deforms, the pull rod rotates, and drives the adjustment plate to rotate with the rotating shaft as the axis, so that the drive rod moves in the slide groove. The slide groove also plays a role of limiting and guiding, increasing the stability of the movement of the adjustment plate and improving the stability of the rotation of the sector gear driving the rotating gear.

[0018] After the pressure gauge under inspection is adjusted, the cover is closed to make the adjustment chamber a closed space, thereby blocking the chute and making the cover body a closed space, so that the opening of the chute will not affect the pressure in the pressure gauge.

[0019] Optionally, the adjustment plate is provided with a fixing component for fixing the adjustment block on the adjustment plate, the fixing component includes an internal gear and a plurality of positioning gear blocks, the internal gear is fixed on the adjustment plate, the internal gear is coaxial with the drive rod, a cavity is provided in the drive rod, a moving component is provided in the cavity, the moving component is connected to the plurality of positioning gear blocks, a plurality of positioning holes are provided on the side wall of the drive rod, and the plurality of positioning gear blocks correspond one-to-one to the positioning holes, and the moving component moves to drive the positioning gear blocks to extend out of the corresponding positioning holes and engage with the internal gear.

[0020] By adopting the above technical solution, in the initial state, several positioning gear blocks are accommodated in the cavity. When the pressure gauge to be tested is adjusted, that is, the distance from the pull rod to the rotating shaft is appropriate, the moving assembly is driven to move, so that the positioning gear blocks extend out of the corresponding positioning holes in the cavity, so that the teeth on the side walls of the positioning gear blocks can engage with the teeth on the internal gear. At this time, the positioning gear blocks cooperate with the internal gear, so that the positioning gear blocks cannot move around the internal gear in the internal gear, that is, the driving rod cannot rotate, so that the conveyor belt is fixed on the adjustment plate, thereby realizing the positioning of the adjustment block on the adjustment plate and completing the calibration of the pressure gauge to be tested.

[0021] Optionally, the moving assembly includes a moving rod, a fixed block and several connecting rods, the moving rod is inserted in the cavity, the moving rod is coaxial with the driving rod, the moving rod can move in the cavity along the length direction of the driving rod, several connecting rods correspond to the positioning tooth blocks one by one, one end of the connecting rod is hinged to the side wall of the moving rod by a torsion spring, and the other end is hinged to the positioning tooth block, the fixed block is fixed in the cavity, the fixed block is located between several positioning tooth blocks, and a guide surface is provided on the side wall of the positioning tooth block close to the fixed block, and when the guide surface abuts the fixed block, the positioning tooth block is driven to move in the direction away from the moving rod.

[0022] By adopting the above technical solution, when the position of the adjusting block is adjusted into place, the moving rod is pressed to make the moving rod penetrate into the cavity, that is, the moving rod drives the positioning tooth block to approach the fixed block. When the guide surface abuts the fixed block, the guide surface plays a guiding role, so that the fixed block slides relatively on the guide surface, thereby making the positioning tooth block move away from the moving rod. During this process, the connecting rod rotates, overcoming the elastic force of the torsion spring, so that the positioning tooth block extends out of the positioning hole and meshes with the internal gear, thereby achieving the fixation of the conveyor belt.

[0023] Optionally, a limiting member is provided on the moving rod, and the limiting member is used to fix the moving rod on the driving rod.

[0024] By adopting the above technical solution, when the moving rod moves and the positioning tooth block extends out of the positioning hole, the limit piece is activated to fix the moving rod in the cavity, so that the connecting rod will not drive the positioning tooth block to retract into the cavity under the elastic force of the torsion spring, while driving the moving rod to extend out of the cavity, thereby increasing the stability of the positioning tooth block extending out of the positioning hole and engaging with the internal gear, thereby improving the stability of the conveyor belt limit adjustment block fixed on the adjustment plate.

[0025] Optionally, the limiting member includes a limiting block and a limiting spring, and a mounting hole is provided on the side wall of the movable rod, and the limiting block and limiting spring are both provided in the mounting hole. The limiting block can move in the mounting hole toward or away from the central axis of the driving rod, and one end of the limiting spring is fixed to the limiting block, and the other end is fixed to the mounting hole, and is used to push the limiting block out of the mounting hole. A limiting hole is provided on the side wall of the driving rod, and when the limiting block is inserted into the limiting hole, the positioning tooth block extends out of the positioning hole.

[0026] By adopting the above technical solution, when the movable rod moves toward the direction close to the fixed block, the guide surface abuts and slides against the fixed block until the positioning tooth block extends out of the corresponding positioning hole. At this time, the limit block has also moved to the limiting hole. Under the elastic force of the limit spring, the limit block is pushed into the limiting hole, and the inner wall of the limiting hole abuts against the limiting hole, so that the movable rod cannot move along the length direction of the driving rod, thereby making the positioning tooth block maintain a state of extending out of the positioning hole and engaging with the internal gear, so that the adjustment block is positioned on the adjustment plate.

[0027] When the position of the adjusting block needs to be adjusted, the limit block is manually pressed, so that the limit block squeezes the limit spring, thereby the limit block is pulled out of the limit hole and stored in the cavity. At this time, the moving rod loses the restriction of movement, the torsion spring recovers its deformation, and drives the connecting rod to move in the direction close to the moving rod, thereby driving the positioning tooth block to be stored in the cavity, and under the sliding cooperation of the guide surface and the fixed block, the positioning tooth block moves in the direction away from the fixed block, thereby driving the moving rod to move in the direction away from the fixed block, until the end of the moving rod protrudes from the driving rod, so as to press the moving rod subsequently.

[0028] Optionally, a movable track is provided in the cover body, and the movable track is slidably connected to the inner wall of the cover body. A screw is rotatably connected to the movable track, and the screw is arranged along the diameter direction of the moving track of the adjustment plate. The screw passes through the cover body and is threadedly connected to the cover body. The screw rotates to drive the connecting track to move toward or away from the rotating shaft. A synchronization rod is provided at one end of the pull rod close to the adjustment plate. The synchronization rod is inserted in the movable track and can move within the movable track.

[0029] By adopting the above technical solution, since the movable track is arranged along the moving track of the adjustment plate, when the adjustment plate rotates, the pull rod moves in the movable track, so that the pull rod is always located at a fixed position on the adjustment plate. When calibrating the pressure gauge, the screw is turned to drive the movable track to move toward or away from the rotating shaft. Since the screw is located on a diameter with the rotating shaft as the center, the movable track always maintains the rotating shaft as the center during the movement process, that is, the movable track is always arranged along the moving track of the adjustment plate, thereby driving the synchronous rod to move, causing the fixed position of the pull rod at the connection on the adjustment plate to change, and then causing the adjustment plate to rotate. The pull rod drives the spring tube to rotate at a different angle to achieve calibration of the pressure gauge. In this process, there is no need to open the cover body, and the position of the pull rod can be adjusted by directly turning the screw.

[0030] On the other hand, the present application provides a calibration method for a pressure gauge calibration device, comprising the following steps: S1. Install the standard instrument and the pressure gauge to be tested on the workbench, and ensure that both the standard instrument and the pressure gauge to be tested are connected to the pressure conduit; S2. Use the pressure generator to provide the same pressure to the standard instrument and the pressure gauge under test, and observe the values ​​on the standard instrument and the pressure gauge under test; S3. Adjust the position of the end of the pull rod on the adjustment plate according to the value to change the rotation angle of the pointer; S4. After the adjustment is completed, the adjustment block connected to the pull rod is fixed on the adjustment plate using the fixing assembly to achieve the positioning of the pull rod on the adjustment plate, thereby completing the calibration of the pressure gauge under inspection.

[0031] In summary, this application has at least one of the following beneficial effects: 1. When calibrating the pressure gauge under test, the adjustment mechanism is directly driven on the outside of the pressure gauge under test, that is, on the cover, to drive the transmission assembly to move. When the spring tube moves the same distance, the angle of the pointer is driven by the transmission assembly to change. As a result, when the pressure gauge under test and the standard instrument are subjected to the same pressure, the value pointed by the pointer is consistent with that on the standard instrument, thus achieving the calibration of the pressure gauge under test. During this process, the transmission assembly can be adjusted without disassembling the entire pressure gauge. The pressure gauge can be calibrated on the outside of the pressure gauge while ensuring that the pressure gauge is intact, which makes the operation more convenient. 2. In the initial state, several positioning gear blocks are stored in the cavity. When the pressure gauge to be tested is adjusted, that is, the distance from the pull rod to the rotating shaft is appropriate, the moving assembly is driven to move, so that the positioning gear blocks extend out of the cavity from the corresponding positioning holes, so that the teeth on the side walls of the positioning gear blocks can engage with the teeth on the internal gear. At this time, the positioning gear blocks cooperate with the internal gear, so that the positioning gear blocks cannot move around the internal gear in the internal gear, that is, the driving rod cannot rotate, so that the conveyor belt is fixed on the adjustment plate, the positioning of the adjustment block on the adjustment plate is realized, and the calibration of the pressure gauge to be tested is completed. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 This is a schematic diagram of the structure of Example 1 of the present application; Figure 2 The diagram of the internal structure of the pressure gauge under inspection is shown in FIG. Figure 3 It is the structural diagram of the pressure gauge under inspection; Figure 4 It is a structural diagram of the connection between the pull rod and the adjustment plate; Figure 5 It is a structural diagram of the regulating mechanism; Figure 6 Structural cross-sectional view of the drive rod Figure 7 It is a structural diagram of the fixed component; Figure 8 for Figure 6 Enlarged view of point A in the middle; Figure 9 Schematic diagram of the structure of the pressure gauge under inspection in Example 2.

[0033] In the figure: 10, workbench; 20, pressure generator; 30, standard instrument; 40, pressure gauge to be tested; 41, cover; 411, slideway; 42, spring tube; 43, transmission assembly; 431, pull rod; 432, sector gear; 433, rotating gear; 434, rotating shaft; 44, pointer; 45, dial; 50, adjustment mechanism; 51, adjustment assembly; 511, adjustment plate; 5111, adjustment slot; 512, conveyor belt; 513, positioning block; 514, adjustment block; 52, drive Parts; 521, driving rod; 5211, cavity; 5212, positioning hole; 5213, limiting hole; 60, fixing assembly; 61, internal gear; 62, positioning gear block; 621, guide surface; 70, moving assembly; 71, moving rod; 711, mounting hole; 72, fixing block; 73, connecting rod; 731, torsion spring; 80, limiting member; 81, limiting block; 82, limiting spring; 90, adjusting chamber; 91, cover plate; 110, moving track; 120, screw; 130, synchronization rod. DETAILED DESCRIPTION

[0034] The following is combined with Figure 1-9 This application is described in further detail.

[0035] Example 1, Example 1 of the present application discloses a pressure gauge calibration device. Figure 1 and Figure 2 The pressure gauge calibration equipment includes a workbench 10 and a pressure generator 20. The pressure generator 20 is installed on the workbench 10. The workbench 10 is threaded with a standard device 30 and a pressure gauge to be tested 40. The pressure generator 20 is connected to the standard device 30 and the pressure gauge to be tested 40 through a pressure conduit. The pressure generator 20 can provide the same pressure to the standard device 30 and the pressure gauge to be tested 40 through the pressure conduit.

[0036] Reference Figure 1 and Figure 2 The pressure gauge 40 under inspection includes a cover body 41, a spring tube 42, a transmission assembly 43, a pointer 44 and a dial 45. The cover body 41 is arranged on the workbench 10, and the spring tube 42 is arranged in the cover body 41. One end of the spring tube 42 is fixed to the cover body 41, and the other end is connected to the transmission assembly 43. The pointer 44 is connected to the transmission assembly 43. The dial 45 is arranged on the cover body 41. The transmission assembly 43 is used to drive the pointer 44 to rotate on the dial 45, and the pressure conduit is connected to the fixed end of the spring tube 42.

[0037] Reference Figure 1 and Figure 2Specifically, the transmission assembly 43 includes a pull rod 431, a sector gear 432 and a rotating gear 433. One end of the pull rod 431 is hinged to the free end of the spring tube 42, and the other end is hinged to the sector gear 432. The sector gear 432 is rotatably connected to the cover body 41 through the rotating shaft 434. The rotating gear 433 is rotatably connected to the center of the cover body 41. The sector gear 432 is meshed with the rotating gear 433, and the pointer 44 is coaxially fixed with the rotating gear 433.

[0038] During use, first install the standard device 30 and the pressure gauge 40 to be tested on the workbench 10 and connect them to the pressure conduit. Then start the pressure generator 20, and provide the same pressure to the standard device 30 and the pressure gauge 40 to be tested at the same time through the pressure conduit. Observe the value on the standard device 30. During this process, the spring tube 42 is deformed under pressure, driving one end of the pull rod 431 to move, causing the pull rod 431 to rotate and move with the fan gear 432. The fan gear 432 is positioned on the cover body 41, so that the fan gear 432 deflects with the rotating shaft 434 as the axis, driving the rotating gear 433 to rotate, and driving the pointer 44 to rotate on the dial 45, so that the pointer 44 points to the corresponding pressure value.

[0039] Reference Figure 2 and Figure 3 , while observing the values ​​on the standard instrument 30 and the pressure gauge under test 40. If they are inconsistent, the pressure gauge under test 40 needs to be adjusted to achieve calibration. An adjustment mechanism 50 is provided on the cover body 41. The adjustment mechanism 50 is connected to the end of the pull rod 431 away from the spring tube 42. The adjustment mechanism 50 includes an adjustment assembly 51 and a driving member 52. The adjustment assembly 51 is provided on the sector gear 432 and connected to the end of the pull rod 431 away from the spring tube 42. The rotation of the adjustment assembly 51 is used to drive the pull rod 431 to move toward or away from the rotating shaft 434. The driving member 52 is provided on the cover body 41 and is connected to the adjustment assembly 51 to drive the adjustment assembly 51 to rotate.

[0040] Reference Figure 4 and Figure 5The adjusting assembly 51 includes an adjusting plate 511, a conveyor belt 512 and an adjusting block 514. The adjusting plate 511 is fixed to the sector gear 432. The adjusting plate 511 is arranged along the diameter direction of the sector gear 432. The conveyor belt 512 is arranged on the adjusting plate 511. The conveyor belt 512 includes a driving wheel, a driven wheel and a belt. The driving wheel and the driven wheel are both rotatably connected to the adjusting plate 511. The belt is sleeved on the driving wheel and the driven wheel. The belt is arranged along the length direction of the adjusting plate 511. The adjusting plate 511 is arranged along the diameter direction of the adjusting plate 511. An adjustment groove 5111 is provided in the length direction of the section plate 511, and two positioning blocks 513 are fixed on the same side of the belt. The positioning blocks 513 are inserted in the adjustment groove 5111, and the conveyor belt 512 rotates to drive the two positioning blocks 513 to move simultaneously toward or away from the rotating shaft 434. The adjustment block 514 is embedded in the adjustment groove 5111 and is located between the two positioning blocks 513. The adjustment block 514 is in contact with the positioning block 513, and the end of the pull rod 431 is hinged to the adjustment block 514.

[0041] Reference Figure 2 and Figure 3 The driving member 52 includes a driving rod 521, which is coaxially fixed to the driving wheel of the conveyor belt 512. The driving rod 521 extends out of the cover body 41. A slide groove 411 is opened on the side wall of the cover body 41. The driving rod 521 passes through the slide groove 411 and moves in the slide groove 411. An adjustment chamber 90 is fixed on the side wall of the cover body 41. One side of the adjustment chamber 90 is open and is hinged with a cover plate 91 for closing the opening. The slide groove 411 is located in the adjustment chamber 90.

[0042] When adjusting the pressure gauge 40 under inspection, open the cover 91 and directly rotate the drive rod 521 to drive the active wheel of the conveyor belt 512 to rotate, so that the entire conveyor belt 512 rotates, thereby causing the two positioning blocks 513 to move in the same direction in the adjustment groove 5111 at the same time, so as to push the adjustment block 514 to move in the adjustment groove 5111, and change the distance from the end of the pull rod 431 to the rotating shaft 434. By utilizing the principle of leverage, when the spring tube 42 is subjected to the same pressure and drives the end of the pull rod 431 connected to the spring tube 42 to move the same distance, the distance that the other end of the pull rod 431 drives the adjustment plate 511 to move changes, thereby causing the deflection angle of the sector gear 432 to change, thereby adjusting the rotation angle of the pointer 44 and completing the calibration of the pressure gauge 40 under inspection.

[0043] Reference Figure 2 and Figure 4 Specifically, when the value on the pressure gauge 40 being tested is smaller than that on the standard instrument 30, the pull rod 431 is adjusted toward the direction of the rotating shaft 434. When the data on the pressure gauge 40 being tested is larger than that on the standard instrument 30, the pull rod 431 is adjusted away from the rotating shaft 434 to ensure that the standard instrument 30 and the pressure gauge 40 being tested display the same value under the same pressure.

[0044] The deformation of the spring tube 42 causes the pull rod 431 to rotate, driving the adjustment plate 511 to rotate about the rotating shaft 434, causing the drive rod 521 to move within the chute 411. The chute 411 also acts as a limiter and guide, increasing the stability of the movement of the adjustment plate 511 and the stability of the rotation of the rotating gear 433 driven by the sector gear 432. After the pressure gauge 40 under inspection is adjusted, the cover 91 is closed, making the adjustment chamber 90 a sealed space, thereby blocking the chute 411 and making the cover body 41 a sealed space. As a result, the opening of the chute 411 does not affect the pressure within the pressure gauge.

[0045] Reference Figure 5 and Figure 6 , when the pressure gauge 40 under inspection is adjusted, that is, the distance from the pull rod 431 to the rotating shaft 434 is suitable, in order to prevent the conveyor belt 512 from rotating again and changing the position of the adjustment block 514, a fixing component 60 is provided on the adjustment plate 511, and the fixing component 60 includes an internal gear 61 and a plurality of positioning gear blocks 62. The internal gear 61 is fixed on the adjustment plate 511, and the internal gear 61 is coaxial with the driving rod 521. A cavity 5211 is provided in the driving rod 521, and a moving component 70 is provided in the cavity 5211. The moving component 70 is connected to the plurality of positioning gear blocks 62, and a plurality of positioning holes 5212 are provided on the side wall of the driving rod 521. The plurality of positioning gear blocks 62 correspond to the positioning holes 5212 one by one. The moving component 70 moves to drive the positioning gear blocks 62 to extend out of the corresponding positioning holes 5212 and engage with the internal gear 61.

[0046] Reference Figure 6 and Figure 7 The moving assembly 70 includes a moving rod 71, a fixed block 72 and several connecting rods 73. The moving rod 71 is inserted in the cavity 5211. The moving rod 71 is coaxial with the driving rod 521. The moving rod 71 can move along the length direction of the driving rod 521 in the cavity 5211. Several connecting rods 73 correspond one-to-one with the positioning gear block 62. One end of the connecting rod 73 is rotatably connected to the side wall of the moving rod 71 through a rotating rod. A torsion spring 731 is sleeved on the rotating rod. One end of the torsion spring 731 is fixed to the connecting rod 73, and the other end is fixed to the moving rod 71. The other end of the connecting rod 73 is hinged on the positioning tooth block 62, and the fixed block 72 is fixed in the cavity 5211. The fixed block 72 is located between several positioning tooth blocks 62. A guide surface 621 is cut on the side of the positioning tooth block 62 close to the moving rod 71. The guide surface 621 is located at the end of the positioning tooth block 62 close to the fixed block 72. The end of the guide surface 621 close to the fixed block 72 is inclined in the direction away from the moving rod 71.

[0047] In the initial state, a plurality of positioning tooth blocks 62 are accommodated in the cavity 5211, and one end of the moving rod 71 extends out of the driving rod 521. When the pressure gauge 40 to be tested is adjusted, the moving rod 71 is pressed so that the moving rod 71 penetrates into the cavity 5211, that is, the moving rod 71 drives the positioning tooth block 62 to approach the fixed block 72. When the guide surface 621 abuts against the fixed block 72, the guide surface 621 plays a guiding role, so that the fixed block 72 slides relatively on the guide surface 621, thereby causing the positioning tooth block 62 to move away from the moving rod 71. In this process, the connecting rod 73 rotates, overcoming the elastic force of the torsion spring 731, so that the positioning tooth block 62 extends out of the cavity 5211 from the corresponding positioning hole 5212, so that the teeth on the side wall of the positioning tooth block 62 can engage with the teeth on the internal gear 61. At this time, the positioning tooth block 62 cooperates with the internal gear 61, so that the positioning tooth block 62 cannot move around the internal gear 61 in the internal gear 61, that is, the driving rod 521 cannot rotate, so that the conveyor belt 512 is fixed on the adjustment plate 511, and the adjustment block 514 is positioned on the adjustment plate 511, completing the calibration of the pressure gauge 40 under inspection.

[0048] Reference Figure 6 and Figure 8 When the positioning gear block 62 is engaged with the internal gear 61, in order to prevent the moving rod 71 from moving and causing the positioning gear block 62 to separate from the internal gear 61, a limit member 80 is provided on the moving rod 71. The limit member 80 includes a limit block 81 and a limit spring 82. A mounting hole 711 is provided on the side wall of the moving rod 71. The limit block 81 and the limit spring 82 are both provided in the mounting hole 711. The limit block 81 can move in the mounting hole 711 toward or away from the central axis of the driving rod 521. One end of the limit spring 82 is fixed to the limit block 81, and the other end is fixed to the mounting hole 711. A limit hole 5213 is provided on the side wall of the driving rod 521. When the limit block 81 is inserted into the limit hole 5213, the positioning gear block 62 extends out of the positioning hole 5212.

[0049] When the movable rod 71 moves toward the direction approaching the fixed block 72, the guide surface 621 abuts and slides against the fixed block 72 until the positioning tooth block 62 extends out of the corresponding positioning hole 5212. At this time, the limit block 81 has also moved to the limiting hole 5213. Under the elastic force of the limiting spring 82, the limit block 81 is pushed into the limiting hole 5213. The inner wall of the limiting hole 5213 abuts against the limiting hole 5213, so that the movable rod 71 cannot move along the length direction of the driving rod 521, so that the positioning tooth block 62 maintains the state of extending out of the positioning hole 5212 and meshing with the internal gear 61, so that the adjustment block 514 is positioned on the adjustment plate 511.

[0050] When the position of the adjustment block 514 needs to be adjusted, the limit block 81 is manually pressed, so that the limit block 81 squeezes the limit spring 82, so that the limit block 81 is pulled out of the limit hole 5213 and is stored in the cavity 5211. At this time, the moving rod 71 loses the restriction of movement, the torsion spring 731 recovers its deformation, and drives the connecting rod 73 to move in the direction close to the moving rod 71, thereby driving the positioning tooth block 62 to be stored in the cavity 5211, and under the sliding cooperation of the guide surface 621 and the fixed block 72, the positioning tooth block 62 moves in the direction away from the fixed block 72, thereby driving the moving rod 71 to move in the direction away from the fixed block 72, until the end of the moving rod 71 protrudes from the driving rod 521, so as to subsequently press the moving rod 71.

[0051] The implementation principle of Example 1 of the present application is as follows: when in use, first install the standard device 30 and the pressure gauge 40 to be tested on the workbench 10 and connect them to the pressure conduit, then start the pressure generator 20, and provide the same pressure to the standard device 30 and the pressure gauge 40 to be tested at the same time through the pressure conduit, observe the value on the standard device 30, and in this process, the spring tube 42 is deformed under pressure, driving the transmission assembly 43 to move, causing the pointer 44 to rotate, and observe whether the value pointed to by the pointer 44 on the dial 45 is consistent with that on the standard device 30.

[0052] If there is a deviation, the adjustment mechanism 50 is directly driven on the outside of the pressure gauge 40 to be tested, that is, on the cover body 41, to drive the transmission assembly 43 to move, so that when the spring tube 42 moves the same distance, the angle of rotation of the pointer 44 is changed by the transmission assembly 43, so that when the pressure gauge 40 to be tested and the standard instrument 30 are subjected to the same pressure, the value pointed by the pointer 44 is consistent with that on the standard instrument 30, thereby realizing the calibration of the pressure gauge 40 to be tested. During this process, the transmission assembly 43 can be adjusted without disassembling the entire pressure gauge. The pressure gauge calibration can be completed on the outside of the pressure gauge while ensuring that the pressure gauge is intact, which makes the operation more convenient.

[0053] Example 2, The difference between Example 2 and Example 1 is that, Figure 1 and Figure 9 A movable track 110 is provided inside the cover body 41. The movable track 110 is arc-shaped and is arranged with the rotating shaft 434 as the center. The movable track 110 can move along the diameter direction of the circle surrounded by itself on the inner wall of the cover body 41, that is, move toward or away from the rotating shaft 434.

[0054] A screw 120 is rotatably connected to the movable track 110. The screw 120 is arranged along the diameter direction of the circle surrounded by the movable track 110. The screw 120 passes through the cover 41 and is threadedly connected to the cover 41. The screw 120 rotates to drive the connected track to move. A synchronization rod 130 is fixed to one end of the pull rod 431 close to the adjustment plate 511. One end of the synchronization rod 130 is embedded in the adjustment groove 5111 in the adjustment plate 511 and can move in the adjustment groove 5111. The other end is inserted into the movable track 110 and can move within the movable track 110.

[0055] Rotating the screw 120 drives the movable rail 110 toward or away from the rotating shaft 434, thereby driving the movement of the synchronization rod 130, changing the position of the connection between the pull rod 431 and the adjustment plate 511 to adjust the pressure gauge. Compared to Example 1, the position of the pull rod 431 on the adjustment plate 511 can be adjusted by simply rotating the screw 120, without having to consider the position of the synchronization rod 130. The position of the synchronization rod 130 can be adjusted directly from outside the cover 41, making operation more convenient.

[0056] The working principle of Example 2 of the present application is: because the movable track 110 is arranged along the moving track of the adjustment plate 511, when the adjustment plate 511 rotates, the pull rod 431 moves in the movable track 110, so that the pull rod 431 is always located at a fixed position on the adjustment plate 511. When calibrating the pressure gauge, the screw 120 is rotated to drive the movable track 110 to move toward or away from the rotating shaft 434. Since the screw 120 is located on the diameter with the rotating shaft 434 as the center, the movable track 110 always maintains the rotating shaft 434 as the center during the movement, that is, the movable track 110 is always arranged along the moving trajectory of the adjustment plate 511, thereby driving the synchronization rod 130 to move, causing the fixed position of the connection between the pull rod 431 and the adjustment plate 511 to change, and then causing the adjustment plate 511 to rotate, and the pull rod 431 drives the spring tube 42 to change its rotation angle to achieve calibration of the pressure gauge. During this process, there is no need to open the cover body 41, and the position of the pull rod 431 can be adjusted by directly rotating the screw 120.

[0057] The present application also discloses a method for calibrating a pressure gauge calibration device, comprising the following steps: S1. Install the standard device 30 and the pressure gauge 40 to be tested on the workbench 10, and ensure that the standard device 30 and the pressure gauge 40 to be tested are connected to the pressure conduit; S2. Use the pressure generator 20 to provide the same pressure to the standard device 30 and the pressure gauge 40 to be tested, and observe the values ​​on the standard device 30 and the pressure gauge 40 to be tested; S3. Adjust the position of the end of the pull rod 431 on the adjustment plate 511 according to the value to change the rotation angle of the pointer 44; S4. After the adjustment is completed, the adjustment block 514 connected to the pull rod 431 is fixed on the adjustment plate 511 using the fixing assembly 60 to achieve the positioning of the pull rod 431 on the adjustment plate 511, and the calibration of the pressure gauge 40 to be tested is completed.

[0058] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A pressure gauge calibration device, characterized in that: The invention comprises a workbench (10) and a pressure generator (20), wherein the pressure generator (20) is arranged on the workbench (10), a standard device (30) and a pressure gauge (40) to be tested are arranged on the workbench (10), and the pressure gauge (40) to be tested comprises a cover (41), a spring tube (42), a transmission assembly (43), a pointer (44) and a dial (45), wherein the cover (41) is arranged on the workbench (10), the spring tube (42) is arranged in the cover (41), one end of the spring tube (42) is fixed to the cover (41), and the other end is connected to the transmission assembly (43), and the pointer (44) is connected to the transmission assembly. (43) is connected, the scale plate (45) is provided on the cover (41), the transmission assembly (43) is used to drive the pointer (44) to rotate on the scale plate (45), the pressure generator (20) is connected to the standard (30) and the spring tube (42) through the pressure conduit, the pressure generator (20) is used to change the pressure of the pressure gauge (40) and the standard (30) under inspection, the cover (41) is provided with an adjustment mechanism (50), the adjustment mechanism (50) is connected to the transmission assembly (43), and the adjustment mechanism (50) is used to drive the transmission assembly (43) to move, so as to change the rotation angle of the pointer (44); The transmission assembly (43) includes a pull rod (431), a sector gear (432) and a rotating gear (433). One end of the pull rod (431) is hinged to the free end of the spring tube (42), and the other end is hinged to the sector gear (432). The sector gear (432) is rotatably connected to the cover (41) via a rotating shaft (434). The rotating gear (433) is rotatably connected to the center of the cover (41). The sector gear (432) is meshed with the rotating gear (433). The pointer (44) is coaxially fixed with the rotating gear (433).

2. The pressure gauge calibration device according to claim 1, characterized in that The adjusting mechanism (50) includes an adjusting component (51) and a driving member (52), wherein the adjusting component (51) is arranged on the sector gear (432), and the adjusting component (51) is connected to the end of the pull rod (431) away from the spring tube (42), and the adjusting component (51) rotates to drive the pull rod (431) to move toward or away from the rotating shaft (434), and the driving member (52) is arranged on the cover body (41), and the driving member (52) is connected to the adjusting component (51) to drive the adjusting component (51) to rotate.

3. The pressure gauge calibration device according to claim 2, characterized in that: The adjusting assembly (51) comprises an adjusting plate (511), a conveyor belt (512) and an adjusting block (514); the adjusting plate (511) is fixed to the sector gear (432); the adjusting plate (511) is arranged along the diameter direction of the sector gear (432); the conveyor belt (512) is arranged on the adjusting plate (511); the conveyor belt (512) is arranged along the length direction of the adjusting plate (511); and the adjusting plate (511) is arranged along the length direction of the adjusting plate (511). An adjusting slot (5111) is provided on the conveyor belt (512), and two positioning blocks (513) are provided on the conveyor belt (512). The positioning blocks (513) are inserted into the adjusting slot (5111). The conveyor belt (512) rotates to drive the two positioning blocks (513) to move simultaneously toward or away from the rotating shaft (434). The adjusting block (514) is provided between the two positioning blocks (513), and the end of the pull rod (431) is hinged on the adjusting block (514).

4. The pressure gauge calibration device according to claim 3, characterized in that: The driving member (52) includes a driving rod (521), which is coaxially fixed on the driving wheel of the conveyor belt (512). The driving rod (521) extends out of the cover body (41), and a sliding groove (411) is opened on the side wall of the cover body (41). The driving rod (521) passes through the sliding groove (411) and moves in the sliding groove (411). An adjustment chamber (90) is fixed on the side wall of the cover body (41), and one side of the adjustment chamber (90) is open and hinged with a cover plate (91) for closing the opening. The sliding groove (411) is located in the adjustment chamber (90).

5. The pressure gauge calibration device according to claim 4, characterized in that: The adjusting plate (511) is provided with a fixing assembly (60) for fixing the adjusting block (514) on the adjusting plate (511), the fixing assembly (60) comprising an internal gear (61) and a plurality of positioning tooth blocks (62), the internal gear (61) being fixed on the adjusting plate (511), the internal gear (61) being coaxial with the driving rod (521), the driving rod (521) being provided with a cavity (5211), the cavity (5211) being provided with a moving assembly (70), the moving assembly (70) being connected to the plurality of positioning tooth blocks (62), the side wall of the driving rod (521) being provided with a plurality of positioning holes (5212), the plurality of positioning tooth blocks (62) corresponding to the positioning holes (5212) one by one, the moving assembly (70) being moved to drive the positioning tooth blocks (62) to extend out of the corresponding positioning holes (5212) and to mesh with the internal gear (61).

6. The pressure gauge calibration device according to claim 5, characterized in that: The moving assembly (70) includes a moving rod (71), a fixed block (72) and a plurality of connecting rods (73). The moving rod (71) is inserted into the cavity (5211). The moving rod (71) is coaxial with the driving rod (521). The moving rod (71) can move in the cavity (5211) along the length direction of the driving rod (521). The plurality of connecting rods (73) correspond to the positioning tooth block (62) one by one. One end of the connecting rod (73) is hinged by a torsion spring (731). It is connected to the side wall of the moving rod (71), and the other end is hinged to the positioning tooth block (62). The fixed block (72) is fixed in the cavity (5211). The fixed block (72) is located between a number of the positioning tooth blocks (62). A guide surface (621) is provided on the side wall of the positioning tooth block (62) close to the fixed block (72). When the guide surface (621) abuts against the fixed block (72), the positioning tooth block (62) is driven to move in a direction away from the moving rod (71).

7. The pressure gauge calibration device according to claim 6, characterized in that: The moving rod (71) is provided with a limiting member (80), and the limiting member (80) is used to fix the moving rod (71) on the driving rod (521).

8. The pressure gauge calibration device according to claim 7, characterized in that: The limiting member (80) includes a limiting block (81) and a limiting spring (82). A mounting hole (711) is provided on the side wall of the movable rod (71). The limiting block (81) and the limiting spring (82) are both provided in the mounting hole (711). The limiting block (81) can move in the mounting hole (711) toward or away from the central axis of the driving rod (521). One end of the limiting spring (82) is fixed to the limiting block (81), and the other end is fixed to the mounting hole (711) for pushing the limiting block (81) out of the mounting hole (711). A limiting hole (5213) is provided on the side wall of the driving rod (521). When the limiting block (81) is inserted into the limiting hole (5213), the positioning tooth block (62) extends out of the positioning hole (5212).

9. The pressure gauge calibration device according to claim 1, characterized in that: A movable track (110) is provided in the cover body (41), and the movable track (110) is slidably connected to the inner wall of the cover body (41). A screw (120) is rotatably connected to the movable track (110), and the screw (120) is arranged along the diameter direction of the moving track of the adjustment plate (511). The screw (120) passes through the cover body (41) and is threadedly connected to the cover body (41). The screw (120) rotates to drive the connecting track to move toward or away from the rotating shaft (434). A synchronization rod (130) is provided at one end of the pull rod (431) close to the adjustment plate (511). The synchronization rod (130) is inserted into the movable track (110) and can move within the movable track (110).

10. A method for calibrating a pressure gauge calibration device, using the pressure gauge calibration device according to any one of claims 1 to 6, characterized in that: The following steps are involved: S1. Install the standard device (30) and the pressure gauge (40) to be tested on the workbench (10), and ensure that the standard device (30) and the pressure gauge (40) to be tested are both connected to the pressure conduit; S2. Using the pressure generator (20), provide the same pressure to the standard device (30) and the pressure gauge (40) to be tested, and observe the values ​​on the standard device (30) and the pressure gauge (40) to be tested; S3. Adjust the position of the end of the pull rod (431) on the adjustment plate (511) according to the numerical value to change the rotation angle of the pointer (44); S4. After the adjustment is completed, the adjustment block (514) connected to the pull rod (431) is fixed on the adjustment plate (511) using the fixing assembly (60), so as to achieve the positioning of the pull rod (431) on the adjustment plate (511), and complete the calibration of the pressure gauge (40) under inspection.

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