Portable hydraulic flange diaphragm capsule pressure instrument calibration table

Abstract

The invention discloses a portable hydraulic flange diaphragm capsule pressure instrument calibration table, and relates to the technical field of instrument debugging. A portable hydraulic flange diaphragm capsule pressure instrument calibration table comprises a base, a flange table top, a pull rod base, a hydraulic jack, a hydraulic pump and an L-shaped pull rod. Handles are arranged on the two sides of the base, four supporting legs are arranged below the flange table top and fixed to the base, a polyvinyl chloride pad is arranged above the table top, a pressure guide hole is formed in the center of the table top, three fixing grooves are evenly distributed in the periphery of the table top and matched with the L-shaped pull rods, and one fixing groove is open in the outer side and provided with a movable pull rod fixing pin and a limiting groove; the pressure guide hole penetrates through the interior of the table top and is communicated with the connector. Spring pull rings are arranged on the back of the flange tabletop and the surface of the pull rod base and are connected through tension springs; mounting lugs corresponding to the fixing grooves are arranged on the side face of the pull rod base, and through holes are formed in the bottoms of the lugs and the bottoms of the L-shaped pull rods and matched with the pull rod fixing pins. The problems of slow butt joint, low bearing pressure, single specification and inaccurate pressing force control in the verification process are effectively solved.

Description

Technical Field

[0001] This invention relates to the field of instrument calibration technology, specifically to a portable hydraulic flange diaphragm pressure instrument calibration bench. Background Technology

[0002] In the instrumentation commissioning industry, the calibration of flange diaphragm pressure gauges has long been a problem for commissioning personnel. This issue has existed for decades and remains an unsolved technical challenge in the industry.

[0003] Currently, the calibration of flange diaphragm pressure gauges with standard pressure instruments requires commissioning personnel to use multiple interface adapters. The entire process requires two people working together, and each calibration takes approximately 30 minutes. The specific procedure is as follows: first, connect the standard pressure instrument to one end of the pressure guide tube; then, match the other end of the pressure guide tube to the flange of the instrument to be calibrated; next, align the flange of the standard pressure instrument with the flange of the instrument to be calibrated, place a sealing gasket between them, and finally, two people work together to tighten the double flanges with bolts to achieve connection between the standard pressure instrument and the instrument to be calibrated. Because the specifications of the flange diaphragm pressure gauges to be calibrated differ, their flange diameters vary. Commissioning personnel must frequently change flanges to match the instrument during calibration, wasting a significant amount of time on connection preparation work that has no practical calibration value. This not only leads to low overall calibration efficiency but also increases material costs due to the need for multiple adapter interfaces and flange accessories.

[0004] Existing similar clamps mostly use manual screw locking and docking, which are large in size, slow in docking process, low in pressure resistance, can only dock micro pressure instruments with a small range of use, cannot accurately control the clamping force, and cannot dock flange diaphragm pressure instruments of various specifications on the same clamping device.

[0005] The industry urgently needs a calibration device that can be operated by a single person, quickly connected, adapted to multiple flange specifications, has strong pressure resistance, and is accurate in operation, in order to fill the market gap and break through the technical bottlenecks that have long plagued the industry. Summary of the Invention

[0006] The purpose of this invention is to provide a portable hydraulic flange diaphragm pressure gauge calibration bench, which solves the problems of slow connection, low pressure resistance, limited specifications, and inaccurate clamping force control of flange diaphragm pressure gauges.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a base, a flange platform, a tie rod base, a hydraulic jack, a hydraulic pump, and an L-shaped tie rod; handles are located on both sides of the base; four flange platform legs are welded below the flange platform, and the flange platform legs are connected and fixed to the base; a polyvinyl chloride gasket is provided above the flange platform, with a pressure guiding hole in the center; the L-shaped tie rod consists of a long handle and a short handle; three fixing grooves are evenly distributed around the flange platform, the fixing grooves are adapted to the long handle of the L-shaped tie rod, one of the fixing grooves has an opening on its outer side, and a movable tie rod fixing pin and a fixing pin limiting groove are provided on the outer side of the opening; a groove is located on the rear side of the flange platform, and a pressure guiding pipe interface is provided in the groove, with the pressure guiding hole extending into the flange platform. The flange extends from the center of the flange platform to the pressure guide pipe interface; a spring pull ring is fixed to the back of the flange platform, and the surface of the pull rod base is provided with the spring pull ring corresponding to the back of the flange platform; the pull rod base and the flange platform are connected by a tension spring; mounting lugs are provided on the side of the pull rod base, the mounting lugs are distributed corresponding to the fixing grooves, the mounting lugs have through holes that fit with the pull rod fixing pins, the bottom of the L-shaped pull rod handle can be embedded in the mounting lugs, and has through holes that fit with the pull rod fixing pins; a jack limiting block is provided on the surface of the pull rod base, and the bottom of the hydraulic jack is inserted into the jack limiting block; the hydraulic pump and hydraulic gauge are fixed on the base, and the hydraulic pump and the hydraulic jack are connected by a hydraulic pipe.

[0008] Furthermore, the hydraulic pump is a manual hydraulic pump, an electric hydraulic pump, or a pneumatic hydraulic pump.

[0009] Furthermore, the L-shaped tie rod is made of high-strength material, passes through the flange platform fixing groove, and the short shanks of the L-shaped tie rod are at a 120° symmetrical angle to each other, and the short shanks of the L-shaped tie rod do not intersect.

[0010] The beneficial effects of this invention are as follows: This application applies the thrust of the hydraulic jack through the L-shaped tie rod and the base of the connecting tie rod to the coaxial outer side of the flange diaphragm pressure gauge and the flange platform, thereby achieving a tight connection between the two flange surfaces; the uniformly distributed fixing grooves adapt to the powerful L-shaped tie rod, ensuring uniform force on the instrument flange surface without deformation; the L-shaped tie rod is perpendicularly and oppositely tightened to the flange platform, enabling the connection of various specifications of flange diaphragm pressure gauges; one of the fixing grooves has an opening on its outer side and is equipped with a movable tie rod fixing pin, which allows the L-shaped tie rod to be moved outward by opening the movable tie rod fixing pin, facilitating the placement of the flange diaphragm pressure gauge on the flange platform, while also cooperating with the fixed pressure guide hole to achieve quick connection; the short handles of the L-shaped tie rod do not intersect, avoiding the instrument and pressure guide pipe above the flange diaphragm pressure gauge.

[0011] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention and to implement it in accordance with the contents of the specification, the preferred embodiments of the present invention are described in detail below with reference to the accompanying drawings. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0013] Figure 2 This is a schematic diagram of the structure of the calibration bench shown in this invention.

[0014] Figure 3 This is a table showing the clamping force of the present invention.

[0015] Explanation of reference numerals in the attached figures: 1-Base; 2-Hydraulic jack; 3-L-shaped tie rod; 4-Hydraulic pump; 5-Tie rod base; 6-Flange platform; 7-PVC gasket; 8-Spring pull ring; 9-Tension spring; 10-Tie rod fixing pin; 11-Screw; 12-Hydraulic pipe interface; 501-Mounting lug; 502-Jack limit block; 601-Flange platform support leg; 602-Pressure guide hole; 603-Fixing groove; 604-Moving tie rod fixing pin; 605-Fixing pin limiting groove. Detailed Implementation

[0016] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. 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.

[0017] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0018] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0019] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0020] Please see Figure 1-2 The portable hydraulic flange diaphragm pressure gauge calibration bench shown in a preferred embodiment of this application includes a base 1, a flange platform 6, a tie rod base 5, a hydraulic jack 2, a hydraulic pump 4, and an L-shaped tie rod 3. Handles are located on both sides of the base 1. Four flange platform legs 601 are welded to the bottom of the flange platform 6, and the flange platform legs 601 are connected and fixed to the base 1. A polyvinyl chloride gasket 7 is placed on top of the flange platform 6, with a pressure guiding hole 602 in the center. The L-shaped tie rod 3 consists of a long handle and a short handle. Three fixing grooves 603 are evenly distributed around the flange platform 6, and the fixing grooves 603 are adapted to the long handles 3 of the L-shaped tie rod. One of the fixing grooves 603 has an opening on its outer side, and a movable tie rod fixing pin 604 and a fixing pin limiting groove 605 are provided on the outer side of the opening. A groove is located on the rear side of the flange platform 6, and a pressure guiding pipe interface 606 and a pressure guiding hole are provided in the groove. 602 extends into the flange platform 6 and from the center of the flange platform 6 to the pressure guide pipe interface 606; a spring pull ring 8 is fixed on the back of the flange platform 6, and a spring pull ring 8 corresponding to the back of the flange platform 6 is provided on the surface of the pull rod base 5. The pull rod base 5 and the flange platform 6 are connected by a tension spring 9; mounting lugs 501 are provided on the side of the pull rod base 5, and the mounting lugs 501 are distributed and correspond to the fixing grooves 603. The mounting lugs 501 have through holes that are adapted to the pull rod fixing pins 10. The bottom of the long handle of the L-shaped pull rod 3 can be embedded in the mounting lugs 501, and has through holes that are adapted to the pull rod fixing pins 10; a jack limit block 502 is provided on the surface of the pull rod base 5, and the bottom of the hydraulic jack 2 is inserted into the jack limit block 502 for fixation; a hydraulic pump 4 and a hydraulic gauge are fixed on the base 1, and the hydraulic pump 4 and the hydraulic jack 2 are connected by a hydraulic pipe.

[0021] Furthermore, the hydraulic pump 4 is a manual hydraulic pump, an electric hydraulic pump, or a pneumatic hydraulic pump.

[0022] Furthermore, the L-shaped tie rod 3 is made of high-strength material and passes through the fixing groove 603 of the flange platform 6. The short handles of the L-shaped tie rod 3 are symmetrical at a 120° angle to each other. The short handles of the L-shaped tie rod 3 do not intersect, leaving a gap so as not to interfere with the pointer instrument and pressure guide pipe above the flange diaphragm pressure gauge.

[0023] like Figure 3 As shown, the flange clamping force is the force applied to the coaxial outer side of the two flanges when the flange is under pressure, which causes the flange gasket to be compressed and deformed and fill the sealing groove inside the flange face to achieve a sealing effect. It is determined by the medium pressure (maximum pressure of instrument calibration), the effective pressure bearing area of ​​the flange (area of ​​the instrument diaphragm), and the working sealing specific pressure coefficient m of the gasket. The expression is F=m·P·A.

[0024] The thrust of a hydraulic jack is determined by the pressure output by the hydraulic pump and the area of ​​the jack piston, expressed as F=P·A.

[0025] When the hydraulic pump is operated to bring the jack's thrust to the flange clamping force, an effective sealing connection between the two flanges can be achieved. Therefore, the hydraulic pump's control pressure can be expressed by the following formula: P1 = m·P2·d22 / d12, where P1 is equal to the square ratio of m multiplied by P2 multiplied by d2 and d1.

[0026] In the formula: p1 is the hydraulic pump control pressure, d1 is the hydraulic jack piston diameter, p2 is the maximum test pressure that the instrument's effective pressure-bearing diaphragm box can withstand, and d2 is the diameter of the instrument's effective pressure-bearing diaphragm box. m is the gasket working seal specific pressure coefficient. Note: (This flange clamping force is calculated based on the clamping force under long-term complex process conditions. The sealing specific pressure coefficient is relatively large. Because the instrument calibration process is short and there are no complex working conditions, the effect of the return spring's reaction tension is so small as to be negligible.)

[0027] In use, place base 1 on a flat surface, place tie rod base 5 under flange platform 6, fix flange platform support leg 601 to base 1, place hydraulic jack 2 between several jack limit blocks 502 on tie rod base 5, connect tension spring 9 to spring ring 8 on upper surface of tie rod base 5 and lower surface of flange platform 6, insert L-shaped tie rod 3 into fixing groove 603 and mounting lug 501, use tie rod fixing pin 10 and screw 11 to install lug 501 to fix L-shaped tie rod 3 to tie rod base 5, and place flange diaphragm pressure gauge on PVC pad 7. Above, the pressure guide hole 602 connects to the instrument, and the pressure guide pipe interface 606 connects to the standard pressure instrument. The movable tie rod fixing pin 604 is inserted into the fixing pin limit groove 605, and the L-shaped tie rod 3 at the opening is fixed. The hydraulic pipe interface 12 is connected to the hydraulic pump 4 using a hydraulic pipe. The hydraulic pump handle is pressed to apply force to the lower surface of the flange platform 6 with the hydraulic jack, while simultaneously moving the L-shaped tie rod vertically along the flange platform 6 to press and fix the flange diaphragm pressure instrument. The standard pressure instrument is used to apply pressure, and the calibration is completed by observing whether the index value of the standard pressure instrument is consistent with the value of the flange diaphragm pressure instrument.

[0028] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0029] The above-described embodiments are merely one implementation of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the scope of protection of the present invention. Therefore, the scope of protection of this invention should be determined by the appended claims.

Claims

1. A portable hydraulic flange diaphragm chamber pressure instrument calibration bench, comprising a base, a flange table, a pull rod base, a hydraulic jack, a hydraulic pump, an L-shaped pull rod; the base has handles on both sides, four flange table legs are welded below the flange table, and the flange table legs are connected and fixed with the base; a polyvinyl chloride pad is arranged above the flange table, and a pressure guide hole is arranged in the center; the L-shaped pull rod is composed of a long handle and a short handle, three fixing grooves are evenly distributed around the flange table, the fixing grooves are matched with the long handle of the L-shaped pull rod, one side of the fixing groove is an opening, and a movable pull rod fixing pin and a fixing pin limiting groove are arranged outside the opening; a recess is arranged at the back of the flange table, a pressure guide pipe interface is arranged in the recess, the pressure guide hole extends from the center of the flange table to the pressure guide pipe interface, a spring pull ring is fixed at the back of the flange table, the surface of the pull rod base is provided with the spring pull ring corresponding to the back of the flange table, and the pull rod base and the flange table are connected by a tension spring; the pull rod base is provided with mounting lugs on the side surface, the mounting lugs are distributed corresponding to the fixing grooves, through holes are arranged in the mounting lugs and matched with the pull rod fixing pin, the long handle of the L-shaped pull rod can be embedded in the mounting lug, and a through hole is arranged and matched with the pull rod fixing pin; the pull rod base is provided with a jack limiting block on the surface, and the hydraulic jack is clamped into the jack limiting block; the hydraulic pump and the hydraulic gauge are fixed on the base, and the hydraulic pump and the hydraulic jack are connected by a hydraulic pipe.

2. The portable hydraulic flanged bellows pressure gauge test stand of claim 1, wherein, The hydraulic pump is a manual hydraulic pump, an electric hydraulic pump or a pneumatic hydraulic pump.

3. The portable hydraulic flanged bellows pressure gauge test stand of claim 1 wherein, The L-shaped pull rod is composed of high-strength material, passes through the flange table fixing groove, the short handles of the L-shaped pull rod are symmetrical at an angle of 120°, and the short handles of the L-shaped pull rod do not intersect.

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