An intelligent calibration device for pressure gauge

Abstract

The present invention relates to the technical field of metrological calibration equipment, and specifically discloses an intelligent calibration device for pressure gauges, which includes a workbench, a computer, a standard pressure generating unit, an image acquisition device, a plurality of clamping mechanisms, a plurality of pressure supply hoses, and a linear feed mechanism; the clamping mechanism is composed of a fixed disk, a rotating disk, a slider, a clamping claw, a round pin, a driving component, and an elastic component, and the clamping mechanism is used to fix the pressure gauge to be tested and to locate the center position of the dial; the linear feed mechanism can adjust the position of the image acquisition device, and then can perform image acquisition on the dial of each pressure to be tested. This intelligent calibration device is suitable for the calibration tasks of pressure gauges of different models, overcomes the influence of the differences in case size and joint length between different pressure gauges on the calibration data, and can improve the image acquisition quality, thereby reducing the system error in the image recognition process, thereby significantly improving the accuracy of the calibration data.

Description

Technical Field

[0001] The invention relates to the technical field of metrological verification equipment, and in particular to an intelligent verification device for a pressure gauge. Background Art

[0002] When conducting accurate calibration of pressure gauges, it is crucial to strictly follow technical specifications. One of the core principles is to ensure that the pressure points of the pressure gauge being tested and the standard are on the same horizontal reference plane. This requirement is intended to eliminate the pressure deviation caused by gravity, which will directly affect the accuracy of the measurement data, especially when dealing with pressure gauges with low ranges (such as 0.6MPa and below) and liquid media. This effect is particularly significant and may even lead to incorrect calibration conclusions. In view of the above requirements, the existing automatic calibration systems for pressure gauges generally integrate specific correction algorithms, which aim to compensate for the pressure deviation introduced by height differences through mathematical models, thereby improving the accuracy of calibration data. However, a complex problem faced in practical applications is that different models of pressure gauges often have significant differences in case size, joint length, etc., resulting in different actual heights of the center of the dial relative to the standard during the calibration process. Therefore, relying solely on a general correction algorithm is often difficult to fully cover and accurately correct the individual differences of all pressure gauges, and the accuracy of the calibration data cannot be guaranteed.

[0003] At the same time, in the automatic calibration process, most automatic calibration equipment relies on image acquisition technology to obtain the dial image of the pressure gauge being tested, and then uses the image recognition algorithm to analyze the pressure value during the calibration process. Given that the height position of the center of the dial is often different when calibrating different pressure gauges, it is difficult to ensure that the image acquisition device maintains a completely positive relationship with the front of the dial. Position deviations often cause the collected dial image to undergo varying degrees of deformation, such as perspective distortion and geometric distortion, which increases the processing difficulty of the image recognition algorithm, introduces larger system errors, and further weakens the reliability of the calibration data. Summary of the invention

[0004] In order to solve the deficiencies in the prior art, the present invention provides an intelligent calibration device for a pressure gauge, which optimizes the fixing method of the pressure gauge to be tested by arranging a clamping mechanism on a workbench, eliminates the influence of differences in case size, joint length, etc. on the calibration data, improves the image acquisition quality, and reduces the system error in the image recognition process, thereby improving the accuracy of the calibration data and the accuracy of the calibration conclusion.

[0005] In order to achieve the above technical objectives, the present invention adopts the following technical solutions:

[0006] An intelligent calibration device for a pressure gauge, comprising a workbench, a computer, a standard pressure generating unit and an image acquisition device; characterized in that it also comprises:

[0007] A plurality of clamping mechanisms, the clamping mechanism comprising a fixed disk supported by a workbench, the fixed disk being provided with at least three slide grooves distributed at equal angles, a slider being provided in the slide groove, a clamping claw and a round pin being fixed to the front and rear sides of the slider respectively; a rotating disk being rotatably fixed to the rear side of the fixed disk, the rotating disk being provided with curved grooves corresponding to the round pins one by one, the round pins extending into the corresponding curved grooves; during the rotation of the rotating disk, the clamping claws are driven to move through the transmission of the curved grooves, the round pins and the slider, and the distances between each clamping claw and the center of the fixed disk are always equal; the clamping mechanism also comprises a driving component for driving the rotating disk to rotate, and an elastic component for driving the rotating disk to return to the initial position and rotate, and when the rotating disk is at the initial position, the distance between the clamping claw and the center of the fixed disk is at the minimum state;

[0008] A plurality of pressure supply hoses, one end of which is fixedly connected to a pressure supply connector and the other end of which is connected to the output end of the standard pressure generating unit;

[0009] A linear feeding mechanism is installed on a workbench and is used to adjust the position of an image acquisition device. The mechanism comprises a slide seat, and the slide seat is located at the front side of the clamping mechanism. The slide seat provides support for the image acquisition device.

[0010] In a preferred embodiment, the sliding groove is a radial groove formed on the fixed disk; and the curved groove is an arc groove or a spiral groove.

[0011] In a preferred embodiment, a stop valve is installed on the pressure supply hose.

[0012] In a preferred embodiment, the peripheral wall of the rotating disk is provided with first teeth, the driving component is a straight rod with second teeth on the side, and the straight rod is transmission-connected with the rotating disk through the meshing of the first teeth and the second teeth; the elastic component is a thrust spring, the thrust spring abuts against one end of the straight rod, and the other end of the straight rod is fixed with a handle;

[0013] Furthermore, the clamping mechanism comprises a shell in the shape of a round box, the shell is fixedly connected to the fixed disk, and the rotating disk is located in the shell; a vertically extending guide cylinder is provided on the shell, the straight rod extends vertically and the handle is located at the upper end, the straight rod extends into the guide cylinder and the two are slidably matched, and the thrust spring is located in the guide cylinder;

[0014] Furthermore, a movable plate capable of adjusting its position up and down is installed in the guide cylinder, and the lower end of the thrust spring is supported by the movable plate.

[0015] In a preferred embodiment, the intelligent testing device further includes a tapping mechanism, which includes a swing frame rotatably fixed on a workbench, a tapping head corresponding to each clamping mechanism is fixed on the swing frame, the tapping head and the corresponding clamping mechanism are spaced apart when the swing frame is in an initial state, the swing frame is connected to a driving mechanism that drives it to reset to an initial state, at least one first magnet is fixed on the swing frame; a second magnet is fixed on the slide; when the slide moves to one end of the stroke, the second magnet attracts the first magnet and drives the swing frame to rotate, and each tapping head taps the corresponding clamping mechanism at the same time;

[0016] Furthermore, the striking head is located at the rear side of the corresponding clamping mechanism, and the striking head is fixedly connected to the swing frame via an elastic arm;

[0017] Furthermore, the swing frame is composed of a rotating rod and two supporting arms respectively fixedly connected to the two ends of the rotating rod, the rotating rod is rotatably fixed on the workbench and is located at the rear side of the clamping mechanism; two first magnets are provided, which are respectively fixed on the two supporting arms; when the slide seat is respectively located at the two ends of the stroke, the second magnet cooperates with the corresponding first magnet to drive the swing frame to rotate;

[0018] Furthermore, the driving mechanism is a counterweight fixedly connected to the swing frame, and the counterweight can drive the swing frame to return to an initial state based on gravity. At the same time, when the swing frame is in the initial state, the counterweight is in direct or indirect contact with the workbench.

[0019] Compared with the prior art, the intelligent calibration device for pressure gauges in the present invention has the following beneficial technical effects:

[0020] The intelligent calibration device disclosed in the present invention is suitable for the calibration task of pressure gauges of different models, overcomes the influence of the differences in case size and joint length between different pressure gauges on the calibration data, and can improve the image acquisition quality, thereby reducing the system error in the image recognition process, thereby significantly improving the accuracy of the calibration data. At the same time, the intelligent calibration device is suitable for batch calibration of multiple pressure gauges at the same time. When fixing the pressure gauge to be tested, there is no need to perform cumbersome height adjustment, nor is there any need to measure the actual height after fixing. The operation is simple and convenient, and the calibration efficiency is extremely high. In addition, during the batch calibration process, the intelligent calibration device controls the pressure supply of all the pressure gauges to be tested through a quasi-pressure generating unit, and sequentially collects images of each pressure gauge to be tested through an image acquisition device combined with a displacement mechanism, so that the overall structure of the intelligent calibration device is simple and compact, effectively reducing the energy consumption during operation, and greatly reducing the equipment manufacturing cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings of the embodiments will be briefly introduced below. Obviously, the drawings in the following description only relate to some embodiments of the present invention, but are not intended to limit the present invention.

[0022] Figure 1 It is a schematic diagram of the overall structure of the intelligent verification device.

[0023] Figure 2 It is a schematic diagram of the overall structure of the intelligent verification device in another direction.

[0024] Figure 3 It is a schematic diagram of the structure of the clamping mechanism and the pressure supply hose.

[0025] Figure 4 This is a schematic diagram of the parts breakdown of the clamping mechanism.

[0026] Figure 5 It is a schematic diagram of the matching structure of the fixed disk and the rotating disk.

[0027] Figure 6 It is a transmission schematic diagram during the rotation of the rotating disk.

[0028] Figure 7 It is a schematic diagram of the structure after the clamping mechanism is partially cut away.

[0029] Figure 8 This is a schematic diagram of the working status of the intelligent calibration device.

[0030] Fig. 9 It is a schematic diagram of the coordination between the pressure gauge under test, the clamping mechanism and the pressure supply hose.

[0031] Fig.10 Schematic diagram of the distribution status of the pressure gauges and image acquisition equipment under inspection during batch calibration.

[0032] Fig.11 A schematic diagram of the front structure of the intelligent testing device when it is equipped with a tapping mechanism.

[0033] Fig.12 A schematic diagram of the rear structure of the intelligent testing device when it is equipped with a tapping mechanism.

[0034] Fig.13 It is a schematic diagram of the cooperation between the swing frame and the clamping mechanism in the initial state.

[0035] Fig.14 This is a schematic diagram of the state when the tapping mechanism taps the clamping mechanism.

[0036] In the figure:

[0037] 1. Workbench;

[0038] 2. Computer;

[0039] 3. Sliding seat;

[0040] 4. Image acquisition equipment;

[0041] 5. Clamping mechanism, 501. Housing, 502. Fixed disk, 503. Slide groove, 504. Clamping claw, 505. Sliding block, 506. Handle, 507. Straight rod, 508. Guide cylinder, 509. First tooth, 510. Round pin, 511. Fixed shaft, 512. Rotating disk, 513. Curved groove, 514. Thrust spring, 515. Movable plate, 516. Second tooth;

[0042] 6. Pressure supply hose, 601, pressure supply connector;

[0043] 7. Swing frame, 701. Rotating rod, 702. Support arm;

[0044] 8. The first magnet;

[0045] 9. Second magnet;

[0046] 10. Hit the head;

[0047] 11. Counterweight;

[0048] 12. Elastic arm. DETAILED DESCRIPTION

[0049] In order to make the purpose, technical solution and advantages of the embodiment of the present invention clearer, the technical solution of the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings of the embodiment of the present invention. Obviously, the described embodiment is a part of the embodiment of the present invention, not all of the embodiments. Based on the described embodiment of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0050] See also Figure 1 , Figure 2 As shown, the intelligent calibration device for the pressure gauge in this embodiment includes:

[0051] Workbench 1;

[0052] Computer 2, which is composed of a PC, a dedicated data acquisition card, a printer and other hardware parts. The PC is installed with pressure verification software, such as ACal, SPMK253, Fast-cal and other commonly used pressure verification and calibration system software;

[0053] The standard pressure generating unit is composed of an automatic pressure source device and a high-precision pressure measuring device. The automatic pressure source device can select a hydraulic source or a gas pressure source according to different applicable scenarios. Under the control of the computer 2, the standard pressure generating unit can automatically pressurize, maintain pressure and reduce pressure to output stable and accurate gas pressure or hydraulic pressure, so as to provide the pressure required for calibration for the pressure gauge under test;

[0054] An image acquisition device 4, which is used to acquire the dial image of the pressure gauge under inspection and transmit the image information or data to the computer 2;

[0055] The above structure is a component generally possessed by the intelligent calibration device for pressure gauges in the prior art, and the specific design during the implementation process can be adaptively adjusted and optimized based on the extensive practice in the prior art.

[0056] Meanwhile, as the necessary components of the intelligent testing device in the present invention, it also includes a clamping mechanism, a pressure supply hose and a linear feeding mechanism;

[0057] See also Figure 1 , Figure 2 As shown, the clamping mechanism 5 is used to clamp and fix the pressure gauge to be tested. In order to meet the technical requirements of batch verification, a plurality of clamping mechanisms 5 are provided with the same structure and are arranged side by side above the workbench 1; see Figure 3-Figure 7As shown, the clamping mechanism 5 includes a disc-shaped fixed disk 502, which is supported and fixed by the workbench 1, and is provided with at least three slide grooves 503 distributed at equal angles on the fixed disk 502, and a slider 505 slidably matched therewith is provided in the slide groove 503, and a claw 504 extending to the front of the fixed disk 502 is fixed to the front side of the slider 505, and a round pin 510 extending to the rear of the fixed disk 502 is fixed to the rear side of the slider 505; a fixed shaft 511 extending backward is fixed to the center of the fixed disk 502, and a rotating disk 512 is rotatably fixed to the rear side of the fixed disk 502 via the fixed shaft 511; the rotating disk 512 is provided with curved grooves 513 equal in number to the round pins 510, and the shapes of these curved grooves 513 are consistent and distributed in a rotationally symmetrical form along the rotation axis of the rotating disk 512; the curved grooves 513 correspond to the round pins 510 one by one, and the round pins 510 extend into the corresponding curved grooves 513 and the two are slidably matched; During the rotation of the rotating disk 512, the curved groove 513 drives the slider 505 to move in the slide groove 503 through the corresponding round pin 510, and the slider 505 drives the claws 504 on the front side to move. In the above process, the distances between each claw 504 and the center of the fixed disk 502 are always equal, so that when the rotating disk 512 rotates in one direction, all the claws 504 shrink synchronously toward the middle, and when the rotating disk 512 rotates in the other direction, all the claws 504 expand synchronously around, so as to realize the function of self-centering clamping; the clamping mechanism 5 also includes a driving component and an elastic component, the driving component is used to drive the rotating disk 512 to rotate and move, so that all the claws 504 expand synchronously around, and the elastic component is used to drive the rotating disk 512 to return to the initial position and rotate, so that all the claws 504 return to the contracted state; when the rotating disk 512 is in the initial position, the distance between the claws 504 and the center of the fixed disk 502 is the minimum state;

[0058] See also Figure 1-Figure 3 As shown, the number of the pressure supply hoses 6 is equal to that of the clamping mechanisms 5. One end of the pressure supply hose 6 is located above the workbench 1 and is fixedly connected with a pressure supply connector 601. The pressure supply connector 601 is used for sealing connection with the pressure gauge to be tested. The other end of the pressure supply hose 6 is communicated with the output end of the standard pressure generating unit. Thus, the pressure supply hose 6 can deliver the medium output by the standard pressure generating unit to each pressure gauge to be tested, so as to provide the pressure required for calibration for the pressure gauge to be tested.

[0059] See also Figure 1 , Figure 2As shown, the linear feed mechanism is installed on the workbench 1, which includes a slide 3. The slide 3 moves linearly in front of the clamping mechanism 5. The slide 3 provides support for the image acquisition device 4. The linear feed mechanism can adjust the position of the image acquisition device 4 based on the instruction of the computer 2, so that the image acquisition device 4 can capture the image of the dial of the inspected pressure gauge fixed by each clamping mechanism 5; the linear feed mechanism is a common mechanism widely used in automation equipment, which can be implemented based on common technical means such as linear motors, ball screw pairs, electric cylinders, hydraulic cylinders and synchronous belt drives.

[0060] This intelligent calibration device is suitable for the calibration task of pressure gauges with circular case bodies. It supports independent calibration of a single pressure gauge and is particularly suitable for automatic batch calibration of multiple pressure gauges with the same range at the same time. The specific operation mode and technical principle are as follows:

[0061] 1. Perform independent calibration on a single pressure gauge.

[0062] like Fig. 9 As shown, first, the pressure gauge to be tested is installed and connected, and the pressure gauge to be tested is sealed and connected to a pressure supply joint 601, and the other pressure supply joints 601 are blocked to avoid pressure leakage. A clamping mechanism 5 is selected, and the driving component is used to drive the rotating disk to rotate, so that the claws 504 expand to the surroundings, and the pressure gauge to be tested is placed between the claws 504, and the driving component stops applying force to the rotating disk. The rotating disk will rotate and move towards the initial position under the drive of the elastic component, and all the claws will shrink synchronously toward the middle, thereby clamping and fixing the pressure gauge to be tested; thereafter, the computer, the standard pressure generating unit and the image acquisition device coordinate and cooperate , can automatically complete the calibration operation, and its working principle is consistent with similar equipment in the prior art. Specifically, a calibration task is established in the computer and relevant information of the pressure gauge to be tested is input. The calibration point, range, calibration items and other parameters are preset according to the actual situation. The standard pressure generating unit provides the pressure required for calibration for the pressure gauge to be tested, and the image acquisition device acquires an image of the dial of the pressure to be tested, and performs the calibration steps of boosting, maintaining and reducing pressure in turn. Finally, the computer conducts an in-depth analysis of the collected data, calculates key calibration data such as indication error, return error, tapping displacement, and automatically generates a calibration conclusion report;

[0063] Since the clamping mechanism has a self-centering function, the centers of the dial of the pressure gauge being tested and the fixed disk tend to coincide with each other after being fixed. Therefore, when different pressure gauges are calibrated separately, the positions of the centers of the dials of these pressure gauges are constant and clear, and are not affected by factors such as case size and joint length. Based on this feature, on the one hand, when different pressure gauges are calibrated separately, the correction effect can be accurately achieved through the system's built-in correction algorithm to ensure the accuracy of the calibration data of each pressure gauge. On the other hand, when different pressure gauges are calibrated separately, the image acquisition device can remain facing the front of the dial, thereby improving the quality of image acquisition, effectively reducing the system errors generated in the image recognition process, further improving the accuracy of the calibration data, and ultimately improving the accuracy of the calibration conclusion.

[0064] 2. Carry out batch calibration on multiple pressure gauges with the same range at the same time.

[0065] See also Figure 8-Figure 10 As shown, referring to the aforementioned installation and fixing method, a plurality of pressure gauges to be inspected are respectively fixed on each clamping mechanism 5 and connected to the corresponding pressure supply hose 6; thereafter, the computer, the standard pressure generating unit and the image acquisition device 4 cooperate to automatically perform batch calibration. Specifically, a calibration task is established in the computer and the relevant information of each pressure gauge to be inspected is input. The calibration point, range, calibration items and other parameters are preset according to the actual situation. The standard pressure generating unit provides the pressure required for calibration for each pressure gauge to be inspected at the same time. The image acquisition device 4 sequentially captures images of the dial of the pressure to be inspected by moving the position. All the pressure gauges to be inspected are treated as a whole and the calibration steps of increasing pressure, maintaining pressure and reducing pressure are performed in sequence. Finally, the computer summarizes and deeply analyzes the collected data corresponding to each pressure gauge to be inspected, calculates the corresponding key calibration data such as indication error, return error, tapping displacement, and automatically generates the corresponding calibration conclusion report;

[0066] like Fig.10 As shown, since the structures adopted by each clamping mechanism 5 are the same and have a self-centering function, the positions of the dial centers of the pressure gauges being calibrated simultaneously are determined and located on the same horizontal plane, and are not affected by differences in case size, joint length and other factors. Based on this feature, on the one hand, when calibrating multiple pressure gauges at the same time, accurate correction effects can be achieved through the system's built-in correction algorithm to ensure the accuracy of the calibration data of each pressure gauge. On the other hand, since the dial centers of the pressure gauges being tested are located on the same horizontal plane, the image acquisition device can adjust its position in the horizontal direction based on the linear feed mechanism, and can keep facing the front of the dial of each pressure gauge being tested in turn, thereby improving the image acquisition quality, effectively reducing the system errors generated in the image recognition process, further improving the accuracy of the calibration data, and ultimately improving the accuracy of the calibration conclusion.

[0067] In summary, the intelligent calibration device disclosed in the present invention is suitable for the calibration task of pressure gauges of different models, overcomes the influence of the differences in case size and joint length between different pressure gauges on the calibration data, and can improve the image acquisition quality, thereby reducing the system error generated in the image recognition process, thereby significantly improving the accuracy of the calibration data. At the same time, the intelligent calibration device is suitable for batch calibration of multiple pressure gauges at the same time. When fixing the pressure gauge to be tested, there is no need to perform cumbersome height adjustment, nor is there any need to measure the actual height after fixing. The operation is simple and convenient, and the calibration efficiency is extremely high. In addition, during the batch calibration process, the intelligent calibration device controls the pressure supply of all the pressure gauges to be tested through a quasi-pressure generating unit, and sequentially captures images of each pressure gauge to be tested through an image acquisition device combined with a displacement mechanism, so that the overall structure of the intelligent calibration device is simple and compact, effectively reducing the energy consumption during operation, and greatly reducing the equipment manufacturing cost.

[0068] like Fig. 9 As shown, during the operation of the intelligent calibration device, the pressure gauge under test is clamped and fixed by the clamping mechanism 5. During the calibration process, no external force acts on the pressure gauge under test except the pressure. Therefore, the clamping claw 504 does not need to provide excessive clamping force to the pressure gauge under test, thereby not causing damage to the case of the pressure gauge. In addition, the pressure gauge under test can also be safely protected by providing soft materials such as plastic, sponge or rubber outside the clamping claw 504.

[0069] Preferably, Figure 4 , Figure 5 As shown, the slide groove 503 is a radial groove opened on the fixed plate 502; the curved groove 513 is a groove extending along a curve, and the curvature of the curve should be balanced, so the curved groove 513 is an arc groove or a spiral groove.

[0070] Preferably, a stop valve (not shown) is installed on the pressure supply hose, or the pressure supply connector adopts a self-closing connector with an internal thread interface; thereby, the on-off state of the pressure supply hose can be controlled according to the requirements of the verification operation.

[0071] In the present intelligent testing device, the driving component is intended to drive the rotating disk to rotate so that the claws expand to the surroundings, so as to facilitate the installation and removal of the pressure gauge to be tested. Based on the above setting intention, the driving component can be implemented based on conventional driving means such as electric and pneumatic, or can be implemented manually. For example, the driving component is a handle, a grip and a handwheel fixedly connected to the rotating disk and convenient for grasping and applying force; the elastic component is intended to provide the rotating disk with a driving force to reset and rotate to the initial position, so that the claws can provide a relatively suitable clamping force for the pressure gauge to be tested. Based on the above setting intention, the elastic component can be a torsion spring or a tension spring connected between the fixed disk and the rotating disk; in this embodiment, a preferred implementation manner is provided for the driving component and the elastic component, specifically:

[0072] See also Figure 3 , Figure 4 , Figure 7 As shown, the peripheral wall of the rotating disk 512 is provided with a first tooth 509, and the driving component is a straight rod 507 with a second tooth 516 on the side. The straight rod 507 can only move linearly along the length direction, and the straight rod 507 and the rotating disk 512 are meshed with the first tooth 509 and the second tooth 516 to be transmission-connected; the elastic component is a thrust spring 514, and the thrust spring 514 abuts against one end of the straight rod 507, and the other end of the straight rod 507 is fixed with a handle 506; therefore, when the handle 506 is manually pressed, the straight rod 507 will drive the rotating disk 512 to rotate, and after the handle 506 is stopped, the thrust spring 514 will drive the rotating disk 512 to reset and move in the direction of the initial position through the straight rod 507; the above structure makes the layout of the driving component, the elastic component and the rotating disk 512 more reasonable, the coordination is more stable, and the manual operation is more labor-saving and convenient.

[0073] Furthermore, if Figure 3 , Figure 4 , Figure 7 As shown, the clamping mechanism includes a round box-shaped shell 501, the shell 501 has an open port, the port is sleeved on the outer peripheral wall of the fixed disk 502 and fixedly connected, and the rotating disk 512 is located in the shell 501; a vertically extending guide cylinder 508 is provided on the shell 501, the straight rod 507 extends vertically and the handle 506 is located at the upper end, the straight rod 507 extends from top to bottom into the guide cylinder 508 and the two are slidably matched, and the thrust spring 514 is located in the guide cylinder 508; thus, the shell 501 can provide good protection for the fixed disk 502, the rotating disk 512, the driving component and the transmission structure arranged between these components, improve the working stability of the clamping mechanism, and make the external shape of the clamping mechanism more concise and beautiful;

[0074] Furthermore, if Figure 7As shown, a movable plate 515 capable of adjusting its position up and down is installed in the guide cylinder 508, and the lower end of the thrust spring 514 is supported by the movable plate 515. Since the upper and lower positions of the movable plate 515 can be adjusted, the position of the lower end of the thrust spring 514 can be adjusted, thereby realizing indirect adjustment of the clamping force of the claws; the movable plate 515 can realize the technical requirement of adjustable position in the guide cylinder 508 through the current commonly used methods such as screw mechanisms, locking bolts, and positioning pins.

[0075] In the calibration process of the pressure gauge, tapping the case is an important step. After recording the indication at the calibration point, tap the case and record the displacement caused by tapping, that is, the tapping displacement. This value can reflect the assembly of the various components of the pressure gauge, whether the hairspring is properly installed, the mechanical friction of the transmission components, whether the adjustment screw is loose, the meshing quality of the teeth, and whether the pointer is loose. When the existing automatic calibration equipment for pressure gauges is working, the operation of tapping the pressure gauge is usually completed manually, or with the help of automatic devices such as electric-controlled tapping heads and precision fixtures instead of manual tapping. The intelligent calibration device in the present invention can use the above-mentioned method in the prior art to realize the operation of tapping the case. Since the main working scene of the intelligent calibration device is to perform batch calibration of multiple pressure gauges at the same time, in the batch calibration process of pressure gauges, if it relies on manual tapping of the case, it will affect the automation effect of the calibration and reduce the calibration efficiency. For example, an automatic device for tapping the corresponding pressure gauge to be tested is set for each clamping mechanism, which makes the overall structure of the equipment complicated and cumbersome, and significantly increases the overall manufacturing cost of the equipment. In view of the above situation, the present invention further provides a tapping mechanism for achieving the purpose of tapping the watch case, specifically:

[0076] See also Figure 11-Figure 14 As shown, the intelligent testing device also includes a tapping mechanism, which includes a swing frame 7 rotatably fixed on the workbench 1, and the rotation axis of the swing frame 7 is in the same direction as the stroke of the slide 3; a tapping head 10 corresponding to each clamping mechanism 5 is fixed on the swing frame 7, and the tapping head 10 and the corresponding clamping mechanism 5 are spaced apart when the swing frame 7 is in the initial state, and the swing frame 7 is connected to a driving mechanism that drives it to reset to the initial state, and at least one first magnet 8 is fixed on the swing frame 7, and a second magnet 9 is fixed on the slide 3; when the slide 3 moves to one end of the stroke, the second magnet 9 and the first magnet 8 are attracted to drive the swing frame 7 to rotate, and each tapping head 10 simultaneously taps the corresponding clamping mechanism 5 under the drive of the swing frame 7, and the clamping mechanism 5 transmits the vibration generated by the tapping to the pressure gauge to be tested fixed by it, thereby achieving a technical effect equivalent to tapping the watch case;

[0077] Based on the above design, when testing at a calibration point, the image acquisition device completes image acquisition of the dial of each pressure gauge being tested by moving in turn, and then continues to move along the original direction to the end point of the stroke, driving the tapping mechanism to tap the clamped mechanism, and then the image acquisition device moves back, and the swing frame is driven by the driving mechanism to reset to the initial state. During the return movement, the image acquisition device again acquires images of the dial of each pressure gauge being tested; thus, the image acquisition device can acquire images of the dial of the pressure gauge being tested before and after the tapping, providing a basis for the calculation of the tapping displacement calibration data;

[0078] Furthermore, if Fig.12 , Fig.13 As shown, the knocking head 10 is located at the rear side of the corresponding clamping mechanism 5; the knocking head 10 is fixedly connected to the swing frame 7 via the elastic arm 12; thereby, the knocking force can be balanced to avoid excessive knocking force causing harm to the equipment or the pressure gauge being tested;

[0079] Furthermore, if Fig.11 , Fig.12 As shown, the swing frame 7 is composed of a rotating rod 701 and two supporting arms 702 respectively fixedly connected to the two ends of the rotating rod 701. The rotating rod 701 is rotatably fixed on the workbench 1 and is located at the rear side of the clamping mechanism 5. Two first magnets 8 are provided, which are respectively fixed on the two supporting arms 702. When the slide 3 is respectively located at the two ends of the stroke, the second magnet 9 cooperates with the corresponding first magnet 8 to drive the swing frame 7 to rotate.

[0080] Furthermore, the driving mechanism is used to drive the swing frame to return to the initial state. In combination with the setting characteristics of the swing frame, the driving mechanism can be an elastic member such as a torsion spring or a spring arranged in an appropriate manner. A more preferred manner is:

[0081] See also Fig.12 As shown, the driving mechanism is a counterweight 11 fixedly connected to the swing frame 7. The counterweight 11 can drive the swing frame 7 to return to its initial state based on gravity. At the same time, when the swing frame 7 is in the initial state, the counterweight 11 is in direct or indirect contact with the workbench 1. Therefore, the counterweight 11 provides a limiting effect for the swing frame 7, so that the swing frame 7 maintains its initial state.

[0082] Unless otherwise defined, the technical terms or scientific terms used in the present invention should be understood by people with ordinary skills in the field to which the present invention belongs. The words "first", "second" and similar words used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, words such as "include" or "comprise" mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Words such as "connect" or "connected" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0083] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

[0084] Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in the field without making any creative work shall fall within the scope of protection of the present invention.

Claims

1. An intelligent calibration device for a pressure gauge, comprising a workbench, a computer, a standard pressure generating unit and an image acquisition device; characterized in that: Also includes: A plurality of clamping mechanisms, wherein the clamping mechanisms are provided in plurality and have the same structure and are arranged side by side above the workbench; the clamping mechanism comprises a fixed disk supported by the workbench, the fixed disk is provided with at least three slide grooves distributed at equal angles, a slider is provided in the slide groove, and a clamping claw and a round pin are respectively fixed to the front and rear sides of the slider; a rotating disk is rotatably fixed to the rear side of the fixed disk, the rotating disk is provided with curved grooves corresponding to the round pins one by one, and the round pins extend into the corresponding curved grooves; during the rotation of the rotating disk, the clamping claws are driven to move through the transmission of the curved grooves, the round pins and the slider, and the distances between each clamping claw and the center of the fixed disk are always equal; the clamping mechanism also comprises a driving component for driving the rotating disk to rotate, and an elastic component for driving the rotating disk to return to the initial position and rotate, and when the rotating disk is in the initial position, the distance between the clamping claw and the center of the fixed disk is at the minimum state; A plurality of pressure supply hoses, one end of which is fixedly connected to a pressure supply connector and the other end of which is connected to the output end of the standard pressure generating unit; A linear feed mechanism is installed on a workbench and includes a slide seat, and the slide seat is located in front of the clamping mechanism, and the slide seat provides support for the image acquisition device; the linear feed mechanism can adjust the position of the image acquisition device based on the instructions of the computer, so that the image acquisition device can acquire images of the dial of the pressure gauge to be inspected fixed by each clamping mechanism; The tapping mechanism includes a swing frame rotatably fixed on the workbench, a tapping head corresponding to each clamping mechanism is fixed on the swing frame, when the swing frame is in the initial state, the tapping head and the corresponding clamping mechanism are spaced apart, the swing frame is connected to a driving mechanism that drives it to reset to the initial state, at least one first magnet is fixed on the swing frame; a second magnet is fixed on the slide, when the slide moves to one end of the stroke, the second magnet attracts the first magnet and drives the swing frame to rotate, and each tapping head taps the corresponding clamping mechanism at the same time; the driving mechanism is a counterweight fixedly connected to the swing frame, the counterweight can drive the swing frame to reset to the initial state based on the action of gravity, and at the same time, when the swing frame is in the initial state, the counterweight is in direct or indirect contact with the workbench to provide a limiting effect on the swing frame.

2. The intelligent calibration device for a pressure gauge according to claim 1, characterized in that: The sliding groove is a radial groove formed on the fixed disk; the curved groove is an arc groove or a spiral groove.

3. The intelligent calibration device for a pressure gauge according to claim 1, characterized in that: A stop valve is installed on the pressure supply hose.

4. The intelligent calibration device for a pressure gauge according to claim 1, characterized in that: The peripheral wall of the rotating disk is provided with first teeth, and the driving component is a straight rod with second teeth on the side. The straight rod and the rotating disk are transmission connected through the meshing of the first teeth and the second teeth; the elastic component is a thrust spring, which abuts against one end of the straight rod, and a handle is fixed to the other end of the straight rod.

5. The intelligent calibration device for a pressure gauge according to claim 4, characterized in that: The clamping mechanism includes a shell in the shape of a round box, which is fixedly connected to a fixed disk, and the rotating disk is located inside the shell; a vertically extending guide cylinder is provided on the shell, the straight rod extends vertically with a handle located at the upper end, the straight rod extends into the guide cylinder and the two are slidably matched, and the thrust spring is located inside the guide cylinder.

6. The intelligent calibration device for a pressure gauge according to claim 5, characterized in that: A movable plate capable of adjusting its position up and down is arranged in the guide cylinder, and the lower end of the thrust spring is supported by the movable plate.

7. The intelligent calibration device for a pressure gauge according to claim 1, characterized in that: The knocking head is located at the rear side of the corresponding clamping mechanism, and the knocking head is fixedly connected to the swing frame via an elastic arm.

8. The intelligent calibration device for a pressure gauge according to claim 1, characterized in that: The swing frame is composed of a rotating rod and two supporting arms respectively fixedly connected to the two ends of the rotating rod. The rotating rod is rotatably fixed on the workbench and is located on the rear side of the clamping mechanism. Two first magnets are provided, which are respectively fixed on the two supporting arms. When the slide seat is respectively located at the two ends of the stroke, the second magnet cooperates with the corresponding first magnet to drive the swing frame to rotate.

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