Inspection equipment for pressure instrument

Abstract

The invention relates to the technical field of visual inspection equipment, in particular to pressure instrument inspection equipment which comprises a conveying mechanism, a plurality of positioning frames used for positioning and placing pressure instruments are fixedly arranged on the surface of a conveying belt of the conveying mechanism, and one side of each positioning frame is fixedly connected with a connecting pipe. A supporting assembly is arranged at one end of the upper portion of the conveying mechanism and comprises a supporting frame fixedly installed at one end of the conveying mechanism, a cleaning assembly used for cleaning the top of a pressure instrument is arranged in the supporting frame, an air pressure assembly is arranged at the top of the supporting frame, and the pressure instrument is pressurized through the air pressure assembly. The cleaning assembly is automatically cleaned while dynamic inspection is achieved, the defects that traditional equipment needs to be shut down regularly and the cleaning assembly needs to be manually disassembled and washed are overcome through the dynamic self-maintenance design, the continuous operation capacity of the equipment is improved, the service life of the cleaning assembly is effectively prolonged, and the cleaning effect of the cleaning assembly on the pressure instrument is effectively guaranteed.

Description

Technical Field

[0001] This invention relates to the field of visual inspection equipment technology, and more specifically, to an inspection device for pressure gauges. Background Technology

[0002] In fields such as industrial production, medical equipment, and energy and chemical engineering, pressure gauges are core components for monitoring pressure parameters, and their measurement accuracy is directly related to production safety and product quality.

[0003] In the automated inspection of pressure instruments, pressure instruments are mostly transported automatically by a conveying mechanism. However, during transport, due to the transport distance or environmental factors, impurities can easily adhere to the surface of the pressure instrument, resulting in insufficient resolution and clarity of the subsequent camera images and reducing the accuracy of the equipment's inspection. Furthermore, traditional inspection equipment with repetitive cleaning components is not convenient for automatically cleaning the cleaning components while the equipment is running. It is necessary to stop the equipment periodically and then disassemble and maintain the cleaning components, thereby reducing the inspection efficiency of the equipment. Summary of the Invention

[0004] The purpose of this invention is to provide a testing device for pressure gauges, in order to solve the problems in the background art where external impurities easily adhere to the surface of pressure gauges during transportation, thereby affecting the detection accuracy of the device, and where existing devices may lack an effective automatic cleaning mechanism, and manual cleaning is inefficient and difficult to perform in real time during the testing process, thus affecting the testing efficiency of the device.

[0005] To achieve the above objectives, the present invention first provides a pressure gauge testing device, including the conveying mechanism. The surface of the conveyor belt of the conveying mechanism is fixedly provided with a plurality of positioning frames for positioning and placing pressure gauges. A connecting pipe is fixedly connected to one side of each positioning frame. A support assembly is provided at one end of the upper part of the conveying mechanism. The support assembly includes a support frame fixedly installed at one end of the conveying mechanism. A cleaning assembly for cleaning the top of the pressure gauge is provided inside the support frame. A pneumatic assembly is provided at the top of the support frame.

[0006] The pneumatic assembly includes a sealing joint for engaging with a connecting pipe on one side of the positioning frame and an air jet pipe positioned above the cleaning assembly. The air jet pipe has several air jet holes symmetrically connected to one side of its interior.

[0007] The internal structure of the support frame synchronously drives the sealing joint to reciprocate laterally and the cleaning component to reciprocate within the support component.

[0008] The beneficial effects of this invention are:

[0009] 1. Before inspecting the pressure gauge, clean the surface of the pressure gauge using the cleaning component to effectively prevent impurities on the surface from affecting the accuracy of subsequent inspections.

[0010] 2. During dynamic testing of pressure instruments, the surface of the cleaning component is cleaned by the pneumatic assembly, which effectively extends the service life of the cleaning component and ensures the cleaning effect of the cleaning component on the pressure instruments.

[0011] Based on the above technical solution, the present invention can be further improved as follows.

[0012] Preferably, the cleaning component includes a cleaning cloth, the positioning frame is parallel to the center of the cleaning cloth, and the size of the cleaning cloth is larger than the diameter of the positioning frame;

[0013] The cleaning cloth is made of microfiber and has a certain degree of elasticity.

[0014] The beneficial effect of adopting the above-mentioned further solution is that it enables the cleaning cloth to effectively clean the upper surface of the pressure instrument and reduces cleaning dead spots.

[0015] Preferably, a camera is fixedly connected to the bottom side of the L-shaped plate on one side of the support frame.

[0016] The beneficial effects of adopting the above-mentioned further solutions are that the machine vision system can complete image acquisition and analysis in milliseconds, far exceeding the speed of manual inspection. It can simultaneously detect multiple targets or multiple features of the same target, reduce process time, improve the overall production cycle, and improve detection accuracy and consistency.

[0017] Preferably, a sliding plate is slidably disposed inside the support frame, with both ends of the sliding plate slidably contacting the two sides inside the support frame, one side of the sliding plate being fixedly connected to the output end of the electric push rod, and one end of the electric push rod being fixedly connected to one side of the support frame;

[0018] The sealing joint is fixedly embedded inside the protruding plate on one side of the sliding plate, and the sealing joint is at the same height as the connecting pipe. When the positioning frame moves to the inspection position, the sealing joint and the connecting pipe are horizontally aligned, and at this time the center point of the positioning frame is aligned with the center point of the camera.

[0019] The beneficial effect of adopting the above-mentioned further solution is that by moving the sealing joint and connecting it with the connecting pipe through the sliding plate, the pressure instrument can be pressurized quickly by the pneumatic assembly. During the process, the reciprocating motion of the sliding plate can be quickly realized by pushing the electric push rod.

[0020] Preferably, the pneumatic assembly further includes a pneumatic pump, one side of which is connected to a sealing joint via a delivery hose, and the top pipe of the jet pipe is fixedly connected to the other side of the pneumatic pump.

[0021] The beneficial effect of adopting the above-mentioned further solution is that it effectively enables the air pump to simultaneously pressurize the sealing joint and the air jet pipe.

[0022] Preferably, a positioning ring is fixedly provided on the lower side of the other side of the support frame, and the inner diameter of the positioning ring is slightly smaller than the diameter of the pressure gauge dial.

[0023] The center point of the positioning ring is consistent with the center point of the camera, so that when the positioning frame moves the pressure gauge to the inspection position, the center point of the positioning frame is aligned with the center point of the positioning ring.

[0024] The advantage of adopting the above-mentioned further solution is that it can stably confine the pressure gauge in the positioning frame without obstructing the inspection work of the gauge.

[0025] Preferably, a rack is fixedly connected to one edge of the sliding plate, and two drive shafts are symmetrically connected to the two ends of the inner side of the cleaning cloth. A gear is fixedly connected to the outer side of one end of the two drive shafts, and the bottom of the rack and the outer side of the gear are meshed.

[0026] The rack movement length is sufficient to enable the drive gear to rotate the transmission shaft half a turn.

[0027] The effective working length of the cleaning cloth should match the envelope length formed by the two drive shafts, and the cleaning cloth should completely switch between the upper and lower surfaces when the drive shaft rotates half a turn.

[0028] The beneficial effect of adopting the above-mentioned further solution is that the lower surface with impurities attached to it after cleaning the pressure instrument surface is moved to the upper surface, which facilitates the subsequent cleaning work of the cleaning cloth surface by the pneumatic components.

[0029] Preferably, a scraper is fixedly connected inside the support frame on the side near the top of the cleaning cloth. The bottom of the scraper has a relatively sharp scraping blade that contacts the upper surface of the cleaning cloth and exerts a slight squeezing force on the cleaning cloth.

[0030] The beneficial effect of adopting the above-mentioned further solution is that it can scrape away stubborn impurities such as oil stains and fine particles remaining on the cleaning cloth, reduce the adhesion between the impurities and the cleaning cloth, and facilitate the efficient cleaning of the cleaning cloth by the subsequent air pressure component.

[0031] Preferably, a filter frame is fixedly installed on one side of the support frame, the filter frame is aligned with the center of the air outlet on one side of the support frame, and its internal dimensions are the same as the dimensions of the air outlet on one side of the support frame.

[0032] The center height of the air outlet on one side of the support frame is the same as the height of the upper surface of the cleaning cloth, and the length of the air outlet is greater than the length of the cleaning cloth.

[0033] The beneficial effects of adopting the above-mentioned further solution are that impurities are blocked and collected in the filter frame, and the filter frame can be disassembled periodically to clean the impurities inside. Through the collection of the filter frame, impurities are prevented from splashing into the working environment due to airflow, thus avoiding secondary pollution to pressure instruments and equipment and further ensuring the cleanliness of the working environment.

[0034] Preferably, a sorting machine is provided on one side of the conveying mechanism, the height of which is lower than that of the conveying mechanism, and one end of the sorting machine is positioned below one end of the conveying mechanism.

[0035] The beneficial effect of adopting the above-mentioned further solution is to realize the automated and rapid sorting of qualified and unqualified pressure instruments.

[0036] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0037] 1. Before inspection, the instrument's surface is cleaned using a cleaning component to remove dust, oil, and other impurities. This prevents these impurities from obscuring the scale, pointer, or causing blurry images, ensuring that the visual inspection agency can acquire high-definition images when performing static inspections of appearance, zero position, and dynamic inspections of the accuracy of the readings. This improves the accuracy of visual inspection from the source.

[0038] 2. The pressure gauge is pressurized by the pneumatic assembly, achieving dynamic testing. At the same time, the jet pipe and jet hole in the pneumatic assembly spray high-speed airflow onto the surface of the cleaning assembly, blowing away impurities attached to the surface of the cleaning assembly and performing self-cleaning. This "dynamic self-maintenance" design avoids the drawbacks of traditional equipment that requires periodic shutdown and manual disassembly and cleaning of the cleaning assembly, reduces equipment downtime, improves the continuous operation capability of the equipment, effectively extends the service life of the cleaning assembly, and effectively ensures the cleaning effect of the cleaning assembly on the pressure gauge. Attached Figure Description

[0039] Figure 1 This is an isometric structural schematic diagram of one side of the present invention;

[0040] Figure 2 This is a schematic diagram of the isometric structure on the other side of the present invention;

[0041] Figure 3 This is a top view schematic diagram showing the placement relationship between the positioning frame and the pressure gauge in this invention;

[0042] Figure 4 This is a three-dimensional structural diagram of one side of the support component of the present invention;

[0043] Figure 5 This is a three-dimensional structural diagram of the other side of the internal structure of the support component of the present invention;

[0044] Figure 6This is a schematic diagram of the cleaning component structure of the present invention;

[0045] Figure 7 This is a schematic diagram of the pneumatic assembly structure of the present invention;

[0046] Figure 8 This is a partial side view cross-sectional structural schematic diagram of the present invention;

[0047] Figure 9 This is a partial three-dimensional structural diagram of the present invention when it is not inflated;

[0048] Figure 10 This is a partial three-dimensional structural diagram of the inflation pressure of the present invention.

[0049] The meanings of the labels in the diagram are as follows:

[0050] 1. Conveying mechanism;

[0051] 2. Positioning frame; 21. Connecting pipe;

[0052] 3. Support components; 31. Support frame; 32. Sliding plate; 33. Electric push rod; 34. Rack; 35. Positioning ring; 36. Scraper; 37. Filter frame;

[0053] 4. Cleaning components; 41. Cleaning cloth; 42. Drive shaft; 43. Gear;

[0054] 5. Pneumatic assembly; 51. Pneumatic pump; 52. Delivery hose; 53. Sealing joint; 54. Air jet pipe; 55. Air jet orifice;

[0055] 6. Camera; 7. Sorting machine. Detailed Implementation

[0056] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0057] Visual inspection agencies typically divide the inspection of pressure gauges into two main stages: hardware deployment and software analysis. The general process is as follows: Image acquisition: Using industrial cameras, lenses, and light sources to capture clear images of the pressure gauge; Preprocessing: Performing noise reduction, enhancement, and distortion correction on the images to improve image quality; Target localization: Identifying key elements of the gauge, such as the dial area, pointer, and scale; Reading calculation: Calculating the pressure value based on the relative position of the pointer and scale; Result judgment: Comparing the detected value with the standard value to determine whether the gauge is qualified (e.g., whether the error is within the allowable range).

[0058] In the process of inspecting pressure gauges through a visual inspection agency, there are two main inspection scenarios: First, static inspection: the visual inspection agency inspects the appearance defects and initial zero / reference value of the pressure gauge under static conditions; Second, dynamic inspection: when a specific pressure (such as a preset standard pressure value) is charged into the pressure gauge, the pointer position or digital display value is visually identified and compared with the standard pressure value to determine whether the dynamic pressure gauge reading is within the allowable error range (core metrological performance inspection) and whether the change of the pointer or number during the pressurization process is continuous and stable, without any abnormalities such as jumps, hysteresis, or overshoot.

[0059] Please see Figures 1-10 As shown, this embodiment provides a testing device for pressure gauges, including the following steps:

[0060] Phase 1: Several positioning frames 2 for positioning and placing pressure instruments are fixedly connected to the surface of the conveyor belt of the conveyor mechanism 1 by external bolts. A connecting pipe 21 is fixedly connected to one side of the positioning frame 2, and the internal channel of the connecting pipe 21 communicates with the internal cavity of the positioning frame 2. Figure 3 As shown, the outer diameter of the pressure gauge is slightly smaller than the inner diameter of the positioning frame 2. After the pressure gauge is placed, the gauge connector is aligned with the inner channel of the connecting pipe 21.

[0061] The conveying mechanism 1 includes a drive assembly and a conveyor belt. The drive assembly drives the conveyor belt (e.g., a motor and conveyor rollers cooperate with the conveyor belt, the motor output shaft drives the conveyor rollers to rotate, so that the conveyor belt meshing between the two conveyor rollers is driven by friction), thereby driving the positioning frame 2 on the surface and the pressure gauge in the positioning frame 2 to be conveyed from one end to the other. This technology is known in this technical field and will not be described in detail here.

[0062] Considering that during the automated inspection of pressure instruments, impurities easily adhere to the inspection surface of the instruments during transport, leading to insufficient resolution and clarity of subsequent camera images and reducing the accuracy of equipment inspection, therefore, as Figure 5 and Figure 6As shown, a support component 3 is provided at one end of the upper part of the conveying mechanism 1. The support component 3 includes a support frame 31 fixedly installed at one end of the conveying mechanism 1. A cleaning component 4 for cleaning the top of the pressure instrument is provided inside the support frame 31. The cleaning component 4 includes a cleaning cloth 41. The positioning frame 2 is parallel to the center of the cleaning cloth 41, and the size of the cleaning cloth 41 is larger than the diameter of the positioning frame 2. When the conveying mechanism 1 and the positioning frame 2 convey the pressure instrument to one end, the pressure instrument needs to pass under the cleaning cloth 41 during the process. At this time, the bottom of the cleaning cloth 41 contacts the upper surface of the pressure instrument. Through the slight friction between the cleaning cloth 41 and the top of the pressure instrument, the impurities on the pressure instrument dial are wiped away, thereby achieving efficient cleaning of the pressure instrument (improving visual inspection accuracy).

[0063] It should be noted that the cleaning cloth 41 is made of microfiber cloth, composed of extremely fine polyester and nylon fibers (usually less than 10 micrometers in diameter). The fiber structure is porous, which has a strong adsorption capacity and can effectively capture dust, oil stains and fine particles. It is also not easy to scratch. In addition, spandex is added to the fibers during the production process. Spandex has high elasticity (elongation can reach 500%-800%). After being blended with microfiber, it can give the fabric a certain degree of stretch and resilience, and can deform with the curvature of the instrument surface (such as the edge of a round dial), effectively reducing cleaning dead corners.

[0064] Phase Two: As Figure 9 and Figure 10 As shown, a camera 6 is fixedly connected to the bottom of the L-shaped plate on one side of the support frame 31. The cleaned pressure gauge continues to be transported through the conveying mechanism 1 and the positioning frame 2. When the pressure gauge moves directly below the camera 6, the conveying mechanism 1 stops transporting the pressure gauge. This process can be determined by a laser sensor in the prior art to determine the positional relationship between the pressure gauge and the camera 6 (for example, if a signal connection is generated between the laser emitter on the camera 6 and the laser receiver on the positioning frame 2, it indicates that the pressure gauge has moved to the appropriate position. At this time, the sensor sends a signal to transmit the data to the control system, and then the control system controls the conveying mechanism 1 to stop transporting). This technology is known in this technical field and will not be described in detail here. After the position of the pressure gauge is determined, the pressure gauge needs to be pressurized to perform dynamic testing.

[0065] Therefore, as Figure 7As shown, a sliding plate 32 is slidably arranged inside the support frame 31. The two ends of the sliding plate 32 are in sliding contact with the two sides inside the support frame 31. One side of the sliding plate 32 is fixedly connected to the output end of the electric push rod 33. One end of the electric push rod 33 is fixedly connected to one side of the support frame 31. A pneumatic assembly 5 is provided on the top of the support frame 31. The pneumatic assembly 5 includes a sealing joint 53 for engaging with the connecting pipe 21 on one side of the positioning frame 2. The sealing joint 53 is fixedly embedded in the protrusion on one side of the sliding plate 32, and the sealing joint 53 is at the same height as the connecting pipe 21. When the positioning frame 2 moves to the inspection position, the sealing joint 53 is horizontally aligned with the connecting pipe 21. At this time, the center point of the positioning frame 2 is aligned with the center point of the camera 6.

[0066] Before pressurizing the pressure gauge, the internal gears or lead screws of the electric push rod 33 are driven by a motor to rotate, converting the rotational motion into the linear extension and retraction motion of the push rod. The push rod is connected to the sliding plate 32, which pushes the sliding plate 32 to move the sealing joint 53 closer to the connecting pipe 21 until the sealing joint 53 and the connecting pipe 21 are connected. The sealing joint 53 may be equipped with a sealing gasket or sealing ring to improve the sealing of the connection and ensure the stability of the air pressure delivery during the subsequent pressurization process. During the process, the reciprocating motion of the sliding plate 32 can be achieved by controlling the power output direction of the electric push rod 33 (such as the forward and reverse rotation of the motor).

[0067] In order to effectively pressurize the pressure gauge via the pneumatic assembly 5, therefore, as Figure 7 As shown, the pneumatic assembly 5 also includes a pneumatic pump 51. One side interface of the pneumatic pump 51 is connected to the sealing joint 53 through the delivery hose 52. After the sealing joint 53 is connected to the connecting pipe 21, when pressurizing the pressure gauge, the pneumatic pump 51 is started to deliver a specific air pressure to the connecting pipe 21 through the delivery hose 52 and the sealing joint 53. Since the connecting pipe 21 is aligned with the pressure gauge interface, the internal sensitive element of the pressure gauge undergoes elastic deformation under the action of a specific air pressure, causing the pointer to rotate and point to the corresponding scale line. Then, the camera 6 performs dynamic inspection on the pressure gauge in the positioning frame 2 to determine whether the pressure gauge reading offset and response performance are qualified.

[0068] It should be noted that: the air pump 51 draws in air and compresses it through an internal power device (such as a motor-driven piston and vanes), converting low-pressure gas into high-pressure airflow, which is then pressurized into the pressure instrument through the delivery hose 52 and sealing joint 53. When the pressure approaches the target value (such as 1MPa), the pressure feedback system of the air pump 51 (such as a built-in pressure sensor) is activated, and the output pressure is kept stable (fluctuation range ≤ ±0.01MPa) by adjusting the valve opening or the piston movement frequency, so as to avoid pressure fluctuations interfering with the instrument response.

[0069] Camera 6 captures the appearance (such as dial, pointer, and digital display area) and status (initial zero position when static, pointer / digital changes when dynamic) of the pressure gauge through its lens, converts the optical signal into a digital image signal, compares the identified features (such as pointer position, digital value, and defect information) with preset standard parameters (such as the indicated value corresponding to the standard pressure, the allowable error range, and the appearance acceptance threshold), automatically determines whether the pressure gauge is qualified, and outputs the test result (such as a qualified / unqualified signal). This detection technology is known in this technical field and will not be described in detail here.

[0070] Furthermore, considering that during the dynamic pressurization test of pressure gauges, to avoid the pressure gauges shaking due to pressure surges and affecting the stability of the test, therefore, as follows... Figure 8 and Figure 9 As shown, a positioning ring 35 is fixedly installed on the lower side of the other side of the support frame 31. The center point of the positioning ring 35 is consistent with the center point of the camera 6. When the positioning frame 2 moves the pressure instrument to the inspection position, the center point of the positioning frame 2 is aligned with the center point of the positioning ring 35. The flexible buffer pad at the bottom of the positioning ring 35 can press the pressure instrument downward. Since the inner diameter of the positioning ring 35 is slightly smaller than the diameter of the pressure instrument dial, the pressure instrument is stably confined in the positioning frame 2 without obstructing the inspection work of the instrument.

[0071] Furthermore, considering that traditional inspection equipment with repetitive cleaning components is not convenient for automatically cleaning the cleaning components while the equipment is running, it is necessary to periodically stop the equipment and then disassemble and maintain the cleaning components, thereby reducing the inspection efficiency of the equipment. In order to enable the pneumatic component 5 to self-clean the cleaning cloth 41 while pressurizing the pressure gauge, this embodiment needs to disclose at least the following structure:

[0072] like Figure 6 As shown, a rack 34 is fixedly connected to one edge of the sliding plate 32. Two drive shafts 42 are symmetrically connected to the two ends of the inner side of the cleaning cloth 41. The specific transmission method can be to put a sleeve of high friction coefficient material (like a rubber sleeve) on the surface of the drive shaft 42, or to add anti-slip texture to the surface of the sleeve. The two ends of the cleaning cloth 41 are squeezed onto the drive shaft 42. When the shaft rotates, the friction can drive the cleaning cloth 41 to drive smoothly. A gear 43 is fixedly connected to the outer side of one end of the two drive shafts 42. The bottom of the rack 34 and the outer side of the gear 43 are meshed. When the sliding plate 32 drives the rack 34 to move closer to the cleaning cloth 41, due to the meshing relationship between the rack 34 and the gear 43, the drive shaft 42 is driven to rotate, which drives the lower surface of the cleaning cloth 41 with impurities after cleaning the pressure instrument surface to the upper surface, which is convenient for the subsequent cleaning work of the air pressure component 5 on the surface of the cleaning cloth 41.

[0073] It should be noted that: for the cleaning cloth 41 to complete one flip of its upper and lower surfaces, the drive shaft 42 needs to rotate half a revolution. Based on the meshing relationship between the gear 43 and the rack 34, the relevant dimensions must meet the following relationships:

[0074] 1. Determine the transmission relationship between gear 43 and rack 34: The travel distance L of rack 34 is closely related to the rotation angle of gear 43. When gear 43 rotates half a turn, the travel distance of rack 34 is equal to half the circumference of the pitch circle of gear 43. The calculation formula is as follows: Where m is the module of gear 43, and Z is the number of teeth of gear 43. For example, for gear 43 with module m = 2mm and number of teeth Z = 20, rack 34 needs to move. This allows gear 43 to drive transmission shaft 42 to rotate half a turn;

[0075] 2. Matching the length of the cleaning cloth 41 with the distance between the drive shafts 42: The effective working length S of the cleaning cloth 41 should match the envelope length formed by the two drive shafts 42. Typically, S is close to the straight-line distance D between the two drive shafts 42 plus the semi-circular length of a single drive shaft 42, i.e. (d is the diameter of the drive shaft 42), ensuring that the cleaning cloth 41 completely switches between the upper and lower surfaces when the drive shaft 42 rotates half a turn.

[0076] During the transmission process of cleaning cloth 41, in order to avoid stubborn impurities remaining on cleaning cloth 41, it is difficult to effectively clean cleaning cloth 41 using only the pneumatic component 5. Therefore, if Figure 4 and Figure 5 As shown, a scraper 36 is fixedly connected to the side of the support frame 31 near the top of the cleaning cloth 41. The bottom of the scraper 36 has a relatively sharp scraping blade that contacts the upper surface of the cleaning cloth 41 and exerts a slight squeezing force on the cleaning cloth 41. When the cleaning cloth 41 is driven, the scraper 36 contacts the surface of the cleaning cloth 41 and can scrape off stubborn impurities such as oil stains and fine particles remaining on the cleaning cloth 41, reducing the adhesion between the impurities and the cleaning cloth 41, which facilitates the efficient cleaning of the cleaning cloth 41 by the subsequent air pressure component 5. The scraper 36 can be made of food-grade or industrial-grade PU material to avoid the sharp scraping blade from cutting or snagging the cleaning cloth fibers.

[0077] Then as Figure 4 and Figure 6As shown, the pneumatic assembly 5 includes an air jet pipe 54 located at one end above the cleaning assembly 4. Several air jet holes 55 are symmetrically connected on one side of the air jet pipe 54. The top pipe of the air jet pipe 54 is fixedly connected to the other side interface of the pneumatic pump 51. When the pneumatic pump 51 pressurizes the pressure instrument, the gas inside it is delivered to the air jet pipe 54 from the other interface. The gas in the air jet pipe 54 forms a uniform air pressure inside the pipe. Then, the high-speed airflow ejected from the air jet holes 55 directly acts on the surface of the cleaning assembly 4. The impact force of the airflow can blow the dust, oil, fine particles and other impurities attached to the surface of the cleaning assembly 4 during the cleaning of the pressure instrument to one end, thereby achieving self-cleaning of the cleaning assembly 4.

[0078] Furthermore, a filter frame 37 is fixedly installed on one side of the support frame 31. The center of the filter frame 37 is aligned with the center of the air outlet on one side of the support frame 31, and its internal dimensions are the same as the dimensions of the air outlet on one side of the support frame 31. Impurities on the surface of the cleaning cloth 41 are blown into the filter frame 37 by the airflow ejected from the jet pipe 54 and jet hole 55. The center height of the air outlet on one side of the support frame 31 is the same as the height of the upper surface of the cleaning cloth 41, and its outlet length is greater than the length of the cleaning cloth 41. This effectively blows impurities into the filter frame 37, preventing impurities from accumulating at one end of the cleaning cloth 41 due to structural obstruction. The filter screen on one side of the filter frame 37 filters the gas mixed with impurities. The gas is discharged through the filter holes, and the impurities are collected in the filter frame 37. The filter frame 37 can be disassembled periodically to clean the impurities inside. Through the collection of the filter frame 37, impurities are prevented from splashing into the working environment due to the airflow, causing secondary pollution to pressure instruments and equipment, and further ensuring the cleanliness of the working environment.

[0079] Phase Three:

[0080] After the dynamic test of the pressure instrument is completed, the air pump 51 is turned off, and the electric push rod 33 is started to drive the sliding plate 32 to move in the opposite direction, which in turn drives the sealing joint 53 to move away from the connecting pipe 21, thus separating the connection. At the same time, due to the reverse movement of the rack 34, the drive gear 43 and the transmission shaft 42 rotate in the opposite direction, which drives the cleaned side surface of the cleaning cloth 41 back to the bottom, and cleans the pressure instruments that subsequently enter the area below the cleaning cloth 41. In this way, the cleaning component 4 can always maintain the cleaning effect on the pressure instrument, while extending the service life of the cleaning component 4 and effectively reducing the impact of impurities on the surface of the pressure instrument on the test results.

[0081] After the position is moved, the pressure gauge is statically inspected by camera 6 to determine whether the appearance of the pressure gauge and the zero pointer are qualified.

[0082] After the inspection is completed, in order to effectively sort the qualified and unqualified pressure gauges, therefore, as follows: Figure 1 and Figure 2As shown, a sorting machine 7 is installed on one side of the conveyor mechanism 1. The height of the sorting machine 7 is lower than that of the conveyor mechanism 1, with one end positioned below one end of the conveyor mechanism 1. After the pressure gauge is inspected, it continues to be conveyed to the sorting machine 7 through the conveyor mechanism 1. When it moves to the end close to the sorting machine 7, the positioning frame 2 follows the conveyor belt in the conveyor mechanism 1 and is driven downward. Then, the pressure gauge falls onto the ball bearing platform on the surface of the sorting machine 7. The sorting machine 7 establishes a communication connection with the front-end detection module (camera 6, etc.) through the control system (such as PLC, industrial computer) and receives inspection result signals (such as electrical signals or digital instructions for "qualified" or "unqualified") in real time. If it is qualified, the pressure gauge continues to slide forward under the conveying of the ball bearing platform and enters the qualified product storage area. If it is unqualified, the control unit controls its internal branch conveyor platform to start. The branch conveyor platform drives the ball bearing to roll in the branch direction, conveying the pressure gauge from the side to the unqualified storage area. This sorting machine 7 is a conventional sorting mechanism in the prior art. This sorting technology is known in this technical field and will not be described in detail here.

[0083] Therefore, the improvement of this embodiment is that, on the one hand, the instrument cleans its surface through the cleaning component 4 before inspection, removing dust, oil and other impurities in advance, so as to avoid these impurities from obscuring the scale and pointer or causing the image to be blurred, ensuring that the visual inspection agency can collect high-definition images during static inspection (appearance, zero position) and dynamic inspection (indication accuracy), thereby improving the accuracy of visual inspection from the source.

[0084] On the other hand, the pressure instrument is pressurized by the pneumatic assembly 5, achieving dynamic testing. At the same time, the jet pipe 54 and jet hole 55 in the pneumatic assembly 5 spray high-speed airflow onto the surface of the cleaning assembly 4, blowing away the impurities attached to the surface of the cleaning assembly 4 and performing self-cleaning of the cleaning assembly 4. This "dynamic self-maintenance" design avoids the drawbacks of traditional equipment that requires periodic shutdown and manual disassembly and cleaning of the cleaning assembly 4, reduces equipment downtime, improves the continuous operation capability of the equipment, effectively extends the service life of the cleaning assembly 4, and effectively ensures the cleaning effect of the cleaning assembly 4 on the pressure instrument.

[0085] In summary, based on the above embodiments, the working principle is as follows:

[0086] The pressure gauges are placed sequentially in the positioning frame 2 of the conveying mechanism 1. The positioning frame 2 restricts the range of movement of the gauges. During conveying, the top of the gauges comes into contact with the microfiber cleaning cloth 41 in the cleaning assembly 4, and the surface impurities are removed by friction to avoid affecting subsequent testing.

[0087] After the instrument is transported to the area below camera 6, a static inspection can be performed first: camera 6 captures the appearance of the instrument, checks for defects such as scratches and stains, and verifies whether the pointer zero position or initial digital display is accurate. After the static inspection, support assembly 3 is activated: electric push rod 33 drives sliding plate 32 to move, and through the meshing transmission of rack 34 and gear 43, drives transmission shaft 42 to rotate, causing the area of ​​cleaning cloth 41 that has been in contact with the instrument to rotate upwards. At the same time, sliding plate 32 drives sealing joint 53 to seal and connect with connecting pipe 21 on one side of positioning frame 2.

[0088] During the dynamic testing phase, the air pump 51 is activated, injecting a specific pressure of gas into the instrument in the positioning frame 2 through the delivery hose 52 and sealing joint 53. Simultaneously, a high-speed airflow is ejected from the air outlet 55 through the air jet pipe 54, working in conjunction with the scraper 36 to self-clean the cleaning cloth 41. Impurities are blown into the filter frame 37 for collection. During the testing process, the positioning ring 35, together with the bottom flexible pad, constantly compresses the instrument to prevent shaking caused by air pressure impact. The camera 6 simultaneously detects the accuracy and response stability of the pointer or digital readings.

[0089] After the inspection is completed, the instruments continue to be conveyed. When they reach sorting machine 7, they receive the front-end inspection signal. Qualified instruments enter the qualified product area along the ball bearing platform in sorting machine 7, while unqualified products are conveyed to the corresponding area by the branch platform, completing the entire inspection process. The whole process automates cleaning, inspection, and sorting. The coordinated operation of all components ensures accurate and efficient inspection, reducing manual intervention.

[0090] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A pressure gauge testing device, comprising the conveying mechanism (1), wherein a plurality of positioning frames (2) for positioning and placing pressure gauges are fixedly arranged on the surface of the conveyor belt of the conveying mechanism (1), and a connecting pipe (21) is fixedly connected to one side of the positioning frame (2), characterized in that: A support assembly (3) is provided at one end of the upper part of the conveying mechanism (1). The support assembly (3) includes a support frame (31) fixedly installed at one end of the conveying mechanism (1). A cleaning assembly (4) for cleaning the top of the pressure gauge is provided inside the support frame (31). A pneumatic assembly (5) is provided at the top of the support frame (31). The pneumatic assembly (5) includes a sealing joint (53) for engaging with a connecting pipe (21) on one side of the positioning frame (2) and an air jet pipe (54) located at one end above the cleaning assembly (4). The air jet pipe (54) has a plurality of air jet holes (55) symmetrically connected on one side inside. The internal structure of the support frame (31) synchronously drives the sealing joint (53) to reciprocate laterally and the cleaning component (4) to reciprocate within the support component (3).

2. The testing equipment for pressure gauges according to claim 1, characterized in that: The cleaning component (4) includes a cleaning cloth (41), the positioning frame (2) is parallel to the center of the cleaning cloth (41), and the size of the cleaning cloth (41) is larger than the diameter of the positioning frame (2); The cleaning cloth (41) is made of microfiber cloth and is elastic.

3. The testing equipment for pressure gauges according to claim 2, characterized in that: A camera (6) is fixedly connected to the bottom side of the L-shaped plate on one side of the support frame (31).

4. The testing equipment for pressure gauges according to claim 3, characterized in that: The support frame (31) has a sliding plate (32) slidably disposed inside. The two ends of the sliding plate (32) are in sliding contact with the two sides inside the support frame (31). One side of the sliding plate (32) is fixedly connected to the output end of the electric push rod (33), and one end of the electric push rod (33) is fixedly connected to one side of the support frame (31). The sealing joint (53) is fixedly embedded in the protruding plate on one side of the sliding plate (32), and the sealing joint (53) is at the same height as the connecting pipe (21). When the positioning frame (2) moves to the inspection position, the sealing joint (53) and the connecting pipe (21) are horizontally aligned. At this time, the center point of the positioning frame (2) is aligned with the center point of the camera (6).

5. The testing equipment for pressure gauges according to claim 1, characterized in that: The pneumatic assembly (5) also includes a pneumatic pump (51), one side of which is connected to a sealing joint (53) via a delivery hose (52), and the top pipe of the jet pipe (54) is fixedly connected to the other side of the pneumatic pump (51).

6. The testing equipment for pressure gauges according to claim 3, characterized in that: A positioning ring (35) is fixedly installed on the lower side of the other side of the support frame (31), and the inner diameter of the positioning ring (35) is slightly smaller than the diameter of the pressure gauge dial. The center point of the positioning ring (35) is consistent with the center point of the camera (6), so that when the positioning frame (2) moves the pressure instrument to the inspection position, the center point of the positioning frame (2) is aligned with the center point of the positioning ring (35).

7. The testing equipment for pressure gauges according to claim 4, characterized in that: A rack (34) is fixedly connected to one edge of the sliding plate (32), and two drive shafts (42) are symmetrically connected to the two ends of the inner side of the cleaning cloth (41). A gear (43) is fixedly connected to the outer side of one end of the two drive shafts (42), and the bottom of the rack (34) and the outer side of the gear (43) are meshed. The rack (34) moves a length that allows the drive gear (43) to rotate the transmission shaft (42) half a turn. The effective working length of the cleaning cloth (41) should match the envelope length formed by the two drive shafts (42), and the cleaning cloth (41) should completely switch between the upper and lower surfaces when the drive shaft (42) rotates half a turn.

8. The testing equipment for pressure gauges according to claim 2, characterized in that: A scraper (36) is fixedly connected to the inside of the support frame (31) near the top of the cleaning cloth (41). The bottom of the scraper (36) has a relatively sharp scraping blade that contacts the upper surface of the cleaning cloth (41) and exerts a squeezing force on the cleaning cloth (41).

9. The testing equipment for pressure gauges according to claim 1, characterized in that: A filter frame (37) is fixedly installed on one side of the support frame (31). The filter frame (37) is aligned with the center of the air outlet on one side of the support frame (31), and its internal dimensions are consistent with the dimensions of the air outlet on one side of the support frame (31). The center height of the air outlet on one side of the support frame (31) is consistent with the height of the upper surface of the cleaning cloth (41), and the length of its air outlet is greater than the length of the cleaning cloth (41).

10. The testing equipment for pressure gauges according to claim 3, characterized in that: A sorting machine (7) is provided on one side of the conveying mechanism (1). The height of the sorting machine (7) is lower than that of the conveying mechanism (1), and one end of the sorting machine (7) is placed below one end of the conveying mechanism (1).

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