Technical field

The utility model relates to an eccentric clamp for a guide wing of an inserted electromagnetic flowmeter measuring head and a processing device thereof.

Background technique

The plug-in electromagnetic flowmeter is mainly used to measure the volume flow of conductive liquids and slurries (such as acids, alkalis, salts and other highly corrosive liquids) in closed pipelines. The plug-in electromagnetic flowmeter is composed of a plug-in electromagnetic flow sensor (sensor for short) and a plug-in electromagnetic flow converter (converter for short), referred to as flowmeter. Among them, the sensor is used to directly measure the flow of the medium, and the shape of the measuring head equipped with the measuring electrode is relatively special.

Since the guide vane is composed of two symmetrical under-hemispherical surfaces, the analysis shows that the respective centers of rotation of the two spherical surfaces are sideways to the center of the measuring head. Generally, there are two methods for manufacturing this measuring head. One is to directly process the guide wing in a computer digital vertical machining center. This method of manufacturing and processing can accurately produce an ideal integrated entity that meets the requirements of the drawing; the other is One is to make two spherical entities first, and then use a welding method or a reverse screw connection method to splice with the measuring electrode installation plane 11 to form a spliced ​​measuring head. Since the splicing is connected by fitter marking and positioning, the workmanship is poor, and it is difficult to ensure the positional requirements of the splicing and the smoothness and smoothness of the intersection line at the connection, and it is urgent to improve.

Utility model content

In view of the problems existing in the prior art, the purpose of this utility model is to propose a plug-in electromagnetic flowmeter measuring head guide wing eccentric fixture and its processing device. Through the implementation of the utility model, the guide wing can be realized on an economical CNC lathe. Integrated manufacturing with the measuring electrode mounting plane.

To achieve this purpose, the utility model adopts the following technical solutions:

A plug-in electromagnetic flowmeter measuring head guide wing eccentric fixture, including:

The base, in a cylindrical shape, is used to be fixed on a CNC lathe;

The eccentric seat, located on the base, is a cylindrical sleeve for mounting and clamping a workpiece, and at least two threaded through holes are provided on the cylindrical sleeve wall; at least two screws are provided on the cylindrical sleeve The outer wall of the cylinder corresponds to the through hole provided on the wall of the cylindrical sleeve, which is used to fasten the workpiece into the cylindrical sleeve.

Preferably, the through holes are distributed on the same circle or on different circles; the screws are distributed on the same circle or on different circles.

Preferably, when the number of the through holes is an even number, they are distributed symmetrically: when the number of the screws is an even number, they are distributed symmetrically.

Preferably, the screw is a hexagon socket screw.

Preferably, the base and the eccentric seat are integrally formed or assembled by welding.

A measuring head processing device with an eccentric fixture, including:

The three-jaw lathe chuck is fixed on the CNC lathe;

Eccentric fixture, including:

The base is cylindrical;

The eccentric seat, located on the base, is a cylindrical sleeve for mounting and clamping a workpiece, and at least two threaded through holes are provided on the cylindrical sleeve wall; at least two screws are provided on the cylindrical sleeve On the outer wall of the cylinder, corresponding to the through hole provided on the wall of the cylindrical sleeve, which is used to fasten the workpiece into the cylindrical sleeve;

The eccentric seat end of the eccentric clamp is loaded into the three-jaw lathe clamping salt, and the inner end surface of the base end of the eccentric clamp is in close contact with the end surface of the clamping jaw of the lathe chuck.

Compared with the prior art, the utility model has the following beneficial effects:

In the utility model, the center of the two spheres and the center of the measuring head are offset and symmetrical to produce an eccentric fixture, which realizes the integrated manufacturing of the guide wing and the measuring electrode installation plane on the economical CNC lathe, so that there is no CNC machining center. Small and medium-sized enterprises can also process and manufacture this special measuring head.

11.Measuring electrode mounting plane: 12, measuring electrode mounting hole: 13, left spherical surface: 14, right spherical surface; 15, intersecting 21, base: 22, eccentric seat: 23, welding point; 24, lathe chuck: 25 , Lathe chuck gripper: 26, workpiece fastening screw; 27, workpiece: 28, turning tool: 29, turning track; 30, position mark.

detailed description

Embodiment 1 of the utility model provides an eccentric fixture for the guide wing of the plug-in electromagnetic flowmeter measuring head, as shown in Figure 2a and Figure 2b, including a base 21, which is in the shape of a cylinder and is used to be fixed on a CNC lathe; The eccentric seat 22 is located on the base 21 and is a cylindrical sleeve for mounting and clamping a workpiece. At least two threaded through holes are provided on the cylindrical sleeve wall; at least two screws are provided on the The outer wall of the cylindrical sleeve corresponds to the through hole provided on the wall of the cylindrical sleeve, and is used to fasten the workpiece into the cylindrical sleeve. Among them, the through holes can be distributed on the same circle or on different circles, preferably evenly distributed; when the number of through holes is even, it is preferably distributed symmetrically: the number of screws can be the same as the number of through holes, or it can be less than the number of through holes The number of screws can be distributed on the same circle or on different circles, preferably evenly distributed, and preferably symmetrically distributed when the number is even. The screws can be hexagon socket screws or other types of screws.

The utility model also considers the convenience of manufacturing, the base 21 and the eccentric seat 22 are manufactured separately, and then welded and spliced ​​through the welding point 23. Under the requirements of ensuring the processing dimensional accuracy, the standard of welding and splicing is based on the eccentric seat 22 and the eccentric seat 22 If the outer circle is flush, then spot welding is enough to ensure the eccentricity specified in the technical requirements of the drawings. After spot welding positioning, it can be staggered according to the requirements in the figure, and the 4-point welding connection becomes a whole.

The process of processing the measuring head of the utility model includes:

Step 1. Mount the eccentric fixture on the CNC lathe, as shown in Figure 3. The specific steps are: insert the small end of the eccentric fixture into the three-jaw lathe chuck 24; clamp the outer circle of the small end, and the inner end surface of the big end is in close contact with the end surface of the jaw 25 of the lathe chuck, and clamp: use the dial indicator to re-check the eccentricity The jig's outer circle runout and end face runout shall not exceed 0.05.

Step 2. Turn the semi-crescent ball with a turning tool, as shown in Figure 4. Specifically, it includes: wrap the workpiece 27 with 0.25 steel skin and penetrate into the cylindrical sleeve; confirm that the workpiece 27 has been clamped in place; tighten 4 tighten the hexagon socket screw 26: check the position of the turning tool 28; make a two-dimensional tool holder according to the program The direction linkage is used to turn the half crescent ball along the turning rail 29. Step 3, mark the intersection point of the crescent arc, and confirm the hemisphere size of the crescent arc on the CNC lathe on the road is correct, as shown in Figure 5. Use the sample punch to mark the position 30 on the end faces of the fixture at the two measuring points of the caliper.

Step 4. Turn the other half of the crescent ball with a turning tool, as shown in Figure 6. Loosen the 4 tightened hexagon socket screws in the figure; rotate the workpiece 27 by 180°, and align the two intersection points of the crescent arc and the workpiece blank circle with the positioning points made in the previous process: after confirming that the positioning is correct, re-tighten the 4 fasteners Hexagon socket screw; turning tool 28 returns to the initial turning position of step 2; after tool setting, the turning tool performs a two-dimensional direction linkage turning hemisphere to the requirement according to the program.

Step 5. Loosen the 4 tightened hexagon socket screws of the clamp, and take out the finished workpiece.

The above are only the preferred specific embodiments of the present utility model, but the scope of protection of the present utility model is not limited to this. The equivalent replacement or change of the new technical scheme and its utility model concept should be covered by the scope of protection of the utility model.