CN115342970A - Checking device of pressure transmitter - Google Patents

Abstract

The invention discloses a pressure transmitter calibration device, and particularly relates to the technical field of pressure transmitter calibration, which comprises a pressure transmitter body, wherein a mounting seat is connected with the pressure transmitter body in an extrusion-type detachable manner, an auxiliary fixing device fixed with a support is arranged right above the mounting seat far away from a joint, the auxiliary fixing device comprises a hydraulic cylinder stretching along the axis direction of the mounting seat, an extrusion piece with a rectangular structure is fixedly arranged at the end of a piston rod of the hydraulic cylinder, the extrusion piece comprises a fixed rod and a split rod which are of a U-shaped structure, the split rod is of a two-section detachable structure, a circular ring is fixedly arranged at the bottom end of the fixed rod and the bottom end of the split rod, and the mounting seat and the pressure transmitter body are in an extrusion-fixed structure through the arranged auxiliary fixing device, so that the pressure transmitter body can be rapidly disassembled and assembled and disassembled without being manually screwed by inspectors, the pressure transmitter calibration device is convenient to disassemble and assemble, and facilitate large-batch calibration work.

Description

Calibration device for pressure transmitter

technical field

The invention relates to the technical field of pressure transmitter calibration, in particular to a calibration device for pressure transmitters.

Background technique

A pressure transmitter is a device that converts pressure into a pneumatic signal or an electric signal for control and remote transmission. It can convert the physical pressure parameters such as gas and liquid felt by the load cell sensor into a standard electrical signal (such as 4~20mADC, etc.), to supply secondary instruments such as indicating alarms, recorders, regulators, etc. for measurement and indication and process regulation.

The pressure transmitter consists of three parts: pressure sensing unit, conversion unit and signal processing module. Convert the pressure signal into a standard signal that can be directly transmitted. The pressure signal and the output signal have a linear relationship. The value transmitted by the standard signal represents the pressure. During the calibration process of the pressure transmitter, the pressure transmitter to be tested needs to be fixed On the pressure test mounting seat, in order to ensure the tightness of the mounting seat, the current calibration device connects the standard gauge with the manual pressurized cylinder through the joint, and the pressure transmitter is threaded with the mounting seat. Therefore, the current The threaded connection between the pressure transmitter and the mounting seat requires a large torque force to ensure the sealing performance during installation. When the number of pressure transmitters to be tested is large, a large amount of time is added during the disassembly process. Workload, the current thread disassembly and assembly method is inconvenient to disassemble and assemble, which in turn leads to the inconvenience of large-scale calibration work.

Contents of the invention

The present invention aims at the problem that the threaded connection between the pressure transmitter and the testing platform is inconvenient for mass calibration. The technical problem to be solved by the invention is to provide a calibration device for the pressure transmitter.

In order to solve the above technical problems, the present invention provides the following technical solutions:

The calibration device of the pressure transmitter includes a pressure transmitter body, a testing platform, a bracket fixed to the testing platform, and two manual pressurization cylinders installed on the testing platform. The manual pressurization cylinder includes two installation One end of the mounting seat on one side is provided with a joint threaded with a standard gauge, the pressure transmitter body includes a lock nut, and the mounting seat on the other side is extruded with the pressure transmitter body. Disassemble the connection, and an auxiliary fixing device fixed to the bracket is provided directly above the mounting seat away from the joint. The auxiliary fixing device includes a hydraulic cylinder that expands and contracts along the axial direction of the mounting seat. The piston rod end of the hydraulic cylinder is fixed with a rectangular The extrusion part of the structure, the extrusion part includes a U-shaped structure of a fixed rod and a split rod, the split rod is a two-stage detachable structure, and the bottom of the fixed rod and the split rod are close Rings are fixedly installed at one end, and the inner diameters of the two rings are the same as the inner diameters of the locking nuts.

As a preferred technical solution of the present invention, the lower end of the circular ring and the upper end of the mounting base are both equipped with gaskets.

As a preferred technical solution of the present invention, the manual pressurization cylinder also includes an air pipe communicating with the mounting seat and a fine-tuning handwheel.

As a preferred technical solution of the present invention, a dial is installed on the side of the test bench close to the fine-tuning handwheel coaxially with the manual pressurized cylinder, and the edge of the outer wall of the fine-tuning handwheel is fixedly installed with a dial facing the dial. laser pointer.

As a preferred technical solution of the present invention, the split rod includes an upper rod and a lower rod, the end of the upper rod near the lower rod is equipped with a T-shaped slide rail, and the end of the lower rod near the upper rod is provided with a Chutes to fit the slide rails.

As a preferred technical solution of the present invention, the dial is provided with one hundred and eighty graduation grooves at equal intervals in a ring.

Compared with prior art, the beneficial effect that the present invention can reach is:

1. Through the set auxiliary fixing device, the installation seat and the pressure transmitter body can be quickly disassembled and assembled by extruding the structure of the pressure transmitter body, and there is no need for manual tightening by the inspector, which is convenient for disassembly and assembly. Large batches of verification work.

2. There are 180 scale grooves at equal intervals on the dial ring, so the angle between every two scale grooves is two degrees. By observing the deflection of the laser pointer irradiation, the deflection angle of the fine-tuning handwheel can be observed, and then in the When pressurizing the pressure transmitter body, it is convenient to adjust and pressurize according to a certain rotation angle.

Description of drawings

Fig. 1 is a schematic diagram of the overall structure of the present invention.

Fig. 2 is a structural schematic diagram of the present invention.

Fig. 3 is a schematic diagram of the enlarged structure at B in Fig. 2 of the present invention.

Fig. 4 is a schematic diagram of the explosion structure of the present invention.

FIG. 5 is a schematic diagram of the enlarged structure at C in FIG. 4 of the present invention.

Fig. 6 is a structural schematic diagram of the pressure transmitter body of the present invention.

Fig. 7 is a schematic diagram of the installation structure of the lower rod and the ring of the split rod of the present invention.

in:

1. Inspection table; 11. Bracket;

2. Manual pressure cylinder; 21. Air pipe; 22. Mounting base; 23. Joint; 24. Fine-tuning handwheel; 25. Laser pointer; 26. Dial;

3. Auxiliary fixing device; 31. Hydraulic cylinder; 32. Extrusion piece; 321. Fixing rod; 322. Split rod; 323. Chute; 324. Slide rail; 33. Ring; 34. Gasket;

4. Pressure transmitter body; 41. Lock nut.

Detailed ways

In order to make the technical means, creative features, goals and effects achieved by the present invention easy to understand, the present invention will be further elaborated below in conjunction with specific embodiments, but the following embodiments are only preferred embodiments of the present invention, not all. Based on the examples in the implementation manners, other examples obtained by those skilled in the art without making creative efforts all belong to the protection scope of the present invention. The experimental methods in the following examples, unless otherwise specified, are conventional methods, and the materials, reagents, etc. used in the following examples, unless otherwise specified, can be obtained from commercial sources.

Example:

As shown in Figure 1-7, a calibration device for a pressure transmitter includes a pressure transmitter body 4, a testing platform 1, a bracket 11 fixed to the testing platform 1, and two manual The pressurizing cylinder 2, the manual pressurizing cylinder 2 includes two mounting seats 22, one end of the mounting seat 22 on one side (as shown in the right side of Figure 1) is provided with a joint 23 threaded with the standard gauge, and the pressure transmitter body 4 includes a lock nut 41, and the mounting seat 22 on the other side (the left side as shown in Figure 1) is detachably connected to the pressure transmitter body 4 by extrusion, and the mounting seat 22 and the pressure transmitter body 4 are fixed by extrusion The structure of the pressure transmitter can quickly realize the disassembly and assembly of the pressure transmitter body 4, and does not need to be manually tightened by the inspection personnel, which is convenient for disassembly and assembly, and is convenient for large-scale calibration work, and is far away from the mounting seat 22 of the joint 23 (as shown in Figure 1 The mounting seat 22) on the left side is provided with an auxiliary fixing device 3 fixed with the support 11. The auxiliary fixing device 3 includes a hydraulic cylinder 31 that expands and contracts along the axial direction of the mounting seat 22. The piston rod end of the hydraulic cylinder 31 is fixedly installed with a The extruded part 32 of rectangular structure, the extruded part 32 comprises the fixing rod 321 of U-shaped structure, the splitting rod 322, and the splitting rod 322 is a two-stage detachable structure, and the bottom of the fixed rod 321 and the splitting rod 322 are mutually connected. The adjacent end is fixedly equipped with a circular ring 33, the inner diameter of the two circular rings 33 is the same as that of the locking nut 41, as shown in Figure 4, the splitting lever 322 on the left side can be split along the horizontal direction, After the lower end of the pressure transmitter body 4 is inserted into the hole of the mounting seat 22 on the left, the ring 33 of the fixing rod 321 is placed above the lock nut 41, and then the ring of the split rod 322 33 is fixed on the top of lock nut 41, and now two circular rings 33 are a cylindrical structure, and the internal diameter of two circular rings 33 is identical with the internal diameter of lock nut 41, completes installation (as shown in Figure 1), then Start the hydraulic cylinder 31 to make the piston rod move downwards. At this time, under the action of the hydraulic cylinder 31, the locking nut 41 and the pressure transmitter body 4 are squeezed and fixed in the direction of the mounting seat 22 by the extrusion part 32. During completion, the piston rod shrinks upwards, and the dismantling rod 322 is removed. At this time, the pressure transmitter body 4 can be quickly removed from the two rings 33, which is convenient for disassembly and assembly, and reduces the work of mass calibration quantity.

Preferably, the lower end of the ring 33 and the upper end of the mounting seat 22 are equipped with a gasket 34, as shown in Figure 3, the upper end of the mounting seat 22 on the left side, and the lower ends of the two rings 33 are all equipped with a gasket 34. The gasket 34 at the bottom of the ring 33 is made of rubber. When the ring 33 squeezes the lock nut 41, the gasket 34 prevents the lock nut 41 from being damaged. The gasket 34 above the mounting seat 22 is a PTFE gasket. The anti-extrusion effect is good, and the sealing performance is strong. When the mounting seat 22 is close to the lower surface of the lock nut 41, the sealing effect after the connection is improved through the gasket, and the gas is prevented from flowing from the lock nut 41 and the installation during inspection. Leakage at connection of seat 22.

Preferably, the manual pressurization cylinder 2 also includes an air pipe 21 communicating with the mounting base 22 and a fine-tuning hand wheel 24 .

Preferably, a dial 26 is installed on the side of the test bench 1 close to the fine-tuning handwheel 24 coaxially with the manual pressurized cylinder 2, and the dial 26 is provided with one hundred and eighty scale grooves at equal intervals in the ring, and the fine-tuning handwheel 24 The edge of the outer wall of the outer wall is fixedly installed with a laser pointer 25 arranged towards the dial 26. As shown in Figure 4, the laser pointer 25 irradiates in the direction of the dial 26, and the dial 26 is provided with one hundred and eighty scale grooves at equal intervals. , so the angle between every two scale grooves is two degrees, and then by observing the deflection of the laser pointer 25, the deflection angle of the fine-tuning handwheel 24 can be observed, and then when the pressure transmitter body 4 is pressurized, it is convenient Pressurize according to the adjustment of a certain rotation angle.

Preferably, the split rod 322 includes an upper rod and a lower rod, the upper rod is equipped with a T-shaped slide rail 324 near the end of the lower rod, and the end of the lower rod near the upper rod is provided with a chute 323 adapted to the slide rail 324, As shown in Figures 5 and 7, the T-shaped slide rail 324 is installed on the end of the upper rod close to the lower rod and the end of the lower rod near the upper rod is provided with a chute 323 adapted to the slide rail 324 to facilitate the disassembly. The sub-rod 322 is disassembled, which is convenient for placing the two rings 33 on the locking nut 41 , or after disassembling the two rings 33 , it is convenient for the pressure transmitter body 4 to be removed from the auxiliary fixing device 3 .

When the present invention is in use, as shown in Figure 1, the mounting seat 22 on the left side is used to install the pressure transmitter body 4, and the mounting seat 22 on the right side is used for the installation of the standard meter (specific installation and use are in the technical field well-known personnel, this case will not go into details), place one end of the lock nut 41 of the pressure transmitter body 4 directly above the left mounting seat 22, and place it under the ring 33 of the fixing rod 321, and then place the The chute 323 of the lower rod of the split rod 322 snaps into the slide rail 324 of the upper rod, and the ring 33 installed at the lower end of the split rod 322 is placed above the locking nut 41, and is connected with the fixed rod 321 The lower circular ring 33 is a cylindrical structure. At this time, the hydraulic cylinder 31 works to squeeze the pressure transmitter body 4 downward, and forms an extrusion sealing structure with the gasket 34 on the upper end of the left mounting seat 22. At this time, the pressure transmitter body 4 can be pressurized and verified by the manual pressurization cylinder 2. After the inspection is completed, the piston rod of the hydraulic cylinder 31 will shrink upwards, and the pressure transmitter body 4 will not be squeezed. , the lower rod can be removed from the upper rod by stretching outward (to the left). At this time, the pressure transmitter body 4 can be removed from the two rings 33. Repeating the above steps can realize large-scale calibration and detection Easy to work and disassemble.

In the present invention, unless otherwise clearly specified and limited, a first feature being "on" or "under" a second feature may include direct contact between the first and second features, and may also include the first and second features Not in direct contact but through another characteristic contact between them. Moreover, "above", "above" and "above" the first feature on the second feature include that the first feature is directly above and obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature. "Below", "beneath" and "under" the first feature to the second feature include that the first feature is directly below and obliquely below the second feature, or simply means that the first feature has a lower level than the second feature.

The basic principles, main features and advantages of the present invention have been shown and described above. Those skilled in the art should understand that the present invention is not limited by the above-mentioned embodiments, and those described in the above-mentioned embodiments and description are only preferred examples of the present invention, and are not intended to limit the present invention, without departing from the spirit and scope of the present invention. Under the premise, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the claimed invention. The protection scope of the present invention is defined by the appended claims and their equivalents.

Claims (6)

1. Pressure transmitter's verifying attachment, including pressure transmitter body (4), checkout stand (1), with support (11) that checkout stand (1) is fixed, install two manual pressure cylinder (2) on checkout stand (1), manual pressure cylinder (2) are including two mount pads (22), one side the one end of mount pad (22) is provided with joint (23) with standard table threaded connection, pressure transmitter body (4) are including lock nut (41), its characterized in that: opposite side mount pad (22) can be dismantled with pressure transmitter body (4) extrusion formula and be connected, keep away from and be provided with supplementary fixing device (3) fixed with support (11) directly over mount pad (22) that connect (23), supplementary fixing device (3) are including hydraulic cylinder (31) flexible along mount pad (22) axis direction, the piston rod end fixed mounting of hydraulic cylinder (31) has extruded article (32) of rectangle structure, extruded article (32) are including dead lever (321), split pole (322) that have U type structure, split pole (322) are two segmentation detachable structures, the equal fixed mounting of one end that dead lever (321), split pole (322) bottom are close to has ring (33), two the internal diameter of ring (33) is the same with the internal diameter of lock nut (41).

2. The pressure transmitter verification device of claim 1, wherein: and sealing gaskets (34) are respectively arranged at the lower end of the circular ring (33) and the upper end of the mounting seat (22).

3. The pressure transmitter verification device of claim 1, wherein: the manual pressurizing cylinder (2) further comprises an air pipe (21) and a fine-tuning hand wheel (24), wherein the air pipe is communicated with the mounting seat (22).

4. The pressure transmitter verification device of claim 1, wherein: one side that checkout stand (1) is close to fine setting hand wheel (24) installs calibrated scale (26) with the axle center with manual pressure cylinder (2), and the outer wall edge fixed mounting of fine setting hand wheel (24) has laser pen (25) towards calibrated scale (26) setting.

5. The pressure transmitter verification device of claim 1, wherein: the splitting rod (322) comprises an upper rod and a lower rod, a T-shaped sliding rail (324) is installed at one end, close to the lower rod, of the upper rod, and a sliding groove (323) matched with the sliding rail (324) is formed in one end, close to the upper rod, of the lower rod.

6. The pressure transmitter verification device of claim 4, wherein: one hundred eighty scale grooves are formed in the dial (26) at equal intervals in an annular mode.

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