Water meter impeller testing tool

Abstract

The utility model discloses a water meter impeller testing tool which comprises a bottom plate, a punch former is arranged at the front end of the bottom plate, a rocker arm of the punch former is arranged in front, and a three-jaw chuck of the punch former clamps a front shaft of an impeller to be tested; the rear end of the bottom plate is provided with a rear plate, the rear plate is in sliding fit with an insertion shaft along the front-back direction, the front end of the insertion shaft is provided with a convex column, and the convex column is inserted into a central hole of a rear shaft of an impeller to be detected; the bottom plate is further provided with a universal magnetic gauge stand, a dial indicator is clamped by a chuck at the free end of the universal magnetic gauge stand, an arc-shaped piece used for abutting against the outer arc face of a blade of the impeller to be measured is fixed to a contact of the dial indicator, and the width of the arc-shaped piece is larger than the distance between two adjacent blades of the impeller. The tool is high in detection efficiency and high in detection speed.

Description

Technical Field

[0001] The utility model relates to the technical field of machinery manufacturing, and particularly relates to a tooling for testing the roundness and coaxiality of a water meter impeller. Background Art

[0002] There are two important parameters for a water meter impeller, namely roundness and coaxiality. Roundness refers to the degree of coincidence between the outer arc surface of each blade of the impeller and the same imaginary toroidal surface, and coaxiality refers to the degree of coincidence of the axis of the front shaft of the smooth rod section of the impeller, the rear shaft of the threaded section, and the axis of the impeller itself. The above two parameters directly affect the stability and accuracy of the water meter operation. And generally, the existing impellers are injection molded, and there is a certain probability that the roundness or coaxiality does not meet the standard. Therefore, there is a need for detection and troubleshooting.

[0003] At present, workers use a vernier caliper to measure the outer diameter of the impeller eight times in eight directions and compare them. If the difference in the outer diameter in different directions does not exceed 0.2 mm, it is judged that the roundness meets the standard. And for coaxiality, the impeller is placed in a projector for comparison.

[0004] The above-mentioned existing detection tools and methods have the following disadvantages. First, the detection process is cumbersome and laborious. Especially for roundness measurement, it is necessary to hold the caliper and detect multiple times in multiple directions, which is time-consuming and laborious, with low efficiency, and the error rate of manual detection is high; the detection of coaxiality is also laborious and slow, and the two detection steps are carried out separately, further increasing the detection workload. Therefore, objectively, it is very difficult to achieve full inspection. In actual operation, sampling inspection is mostly used, and there are objectively cases of missed detection. In summary, the existing detection means cannot meet the actual production needs due to low efficiency. Summary of the Utility Model

[0005] The technical problem to be solved by the utility model is to provide a tooling for testing a water meter impeller with high detection efficiency and fast detection speed.

[0006] The technical solution of the utility model is to provide a tooling for testing a water meter impeller, which includes a bottom plate. A punch former is provided at the front end of the bottom plate, the rocker arm of the punch former is in the front, and the three-jaw chuck of the punch former clamps the front shaft of the impeller to be tested; a rear plate is provided at the rear end of the bottom plate, a plug shaft is slidably matched with the rear plate in the front-rear direction, a convex column is provided at the front end of the plug shaft, and the convex column is inserted into the central hole of the rear shaft of the impeller to be tested; the bottom plate is also provided with a universal magnetic base, the free end chuck of the universal magnetic base clamps a dial indicator, an arc-shaped piece for abutting against the outer arc surface of the blade of the impeller to be tested is fixed to the contact head of the dial indicator, and the width of the arc-shaped piece is greater than the distance between two adjacent blades of the impeller.

[0007] The detection process of this test tooling is as follows. Insert the front shaft of the impeller into the center of the three-jaw chuck of the punch former and clamp it. Then, push the insertion shaft forward so that the protruding column of the insertion shaft inserts into the center hole of the rear shaft of the impeller. At this time, the coaxiality detection of the front shaft and the rear shaft of the impeller has actually been completed. Because the concentricity requirement for the front and rear shafts of the impeller during water meter assembly is not particularly high, when the front shaft of the impeller is clamped, if the insertion shaft can be smoothly inserted into the rear shaft of the impeller, it indicates that the concentricity of the front and rear shafts meets the assembly requirements. On the contrary, if the insertion process of the insertion shaft is stuck, it indicates that the concentricity of the front and rear shafts does not meet the standard. Next, loosen the adjustment screw of the universal magnetic base to unlock the swing arm of the base. Then, place the arc-shaped piece of the dial indicator against the outer arc surface of two adjacent blades on the impeller, and then tighten the adjustment screw to lock the positions of the swing arm and the dial indicator. Then, the worker manually rotates the swing arm of the punch former to rotate the impeller and observes the reading of the dial indicator. The reading of this dial indicator is the radial runout value. If the variation of the radial runout value does not exceed 0.2 mm, it indicates that the roundness of the outer contour of the impeller meets the standard, and at the same time, the concentricity between the impeller itself and the front shaft of the impeller also meets the standard.

[0008] From the above analysis, it can be seen that the above tooling can make the detection process convenient and fast. It only needs to clamp the front shaft, insert the rear shaft, adjust the gauge stand, rotate the swing arm, and observe the dial indicator. Especially compared with the prior art process of measuring with a caliper from eight directions, the detection process of this application saves time and effort, is fast and efficient, and significantly reduces the measurement workload. Moreover, this application integrates two independent detection steps in the prior art and only performs one detection to complete the inspection of two parameters, namely the concentricity of the impeller body, the front shaft, and the rear shaft, and the roundness of the impeller. Therefore, the efficiency is further improved. Furthermore, the detection accuracy of this tooling is high and it is not easy to misdetect. Moreover, precisely because the detection efficiency is improved and the speed is increased, the detection frequency can be increased to ensure that all inspections are carried out and omissions are avoided.

[0009] Preferably, the rear plate is provided with a mounting hole, and a linear bearing is sleeved in the mounting hole. The rear flange of the linear bearing is screwed to the rear plate, and the insertion shaft is axially slidably fitted in the linear bearing. A shaft cap is sleeved at the front end of the insertion shaft, and the shaft cap is fixed to the insertion shaft by a fastening bolt. The protruding column is fixed at the front end of the shaft cap. The above structure has stable functions and can ensure the smooth and stable sliding of the insertion shaft in the front-rear direction. Moreover, the above structure is convenient for assembly. The detachable connection between the insertion shaft and the shaft cap is convenient for replacing protruding columns with different diameters, so as to adapt to impellers with different center hole diameters and different models.

[0010] Further preferably, the punch former is fixed to the bottom plate through a cushion block. Two front-rear chutes are provided on the bottom plate, and a U-shaped dust cover is slidably fitted in the above chutes. A lifting ring is welded to the upper end of the U-shaped dust cover. In this way, when not in use, the dust cover can be buckled on the tooling to achieve effective protection, and various movable parts such as the universal magnetic base can also be folded and wrapped for protection, which is convenient for packaging and transportation. Description of the Drawings

[0011] Figure 1 It is a schematic structural diagram of the water meter impeller test tooling of the present utility model.

[0012] Figure 2 is Figure 1 The schematic structural diagram after deflecting a certain angle.

[0013] Figure 3 It is the schematic structural diagram of the water meter impeller test tooling of the present utility model after covering with a dust-proof cover.

[0014] Figure 4 It is the enlarged schematic structural diagram of the impeller.

[0015] Figure 5 is Figure 4 The schematic structural diagram after deflecting a certain angle.

[0016] As shown in the figure, 1 is the bottom plate, 2 is the cushion block, 3 is the punch former, 3.1 is the rocker arm, 3.2 is the three-jaw chuck, 4 is the impeller, 4.1 is the front shaft, 4.2 is the rear shaft, 4.3 is the blade, 5 is the rear plate, 6 is the inserted shaft, 7 is the linear bearing, 7.1 is the rear flange, 8 is the shaft cap, 8.1 is the threaded hole, 8.2 is the convex column, 9 is the universal magnetic base, 9.1 is the adjusting screw, 9.2 is the swing arm, 10 is the dial indicator, 11 is the sliding groove, 12 is the U-shaped dust-proof cover, 13 is the arc-shaped piece, 14 is the lifting ring. Specific embodiments

[0017] The present utility model will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0018] As Figures 1 to 5 shown, the water meter impeller test tooling of the present utility model includes a steel bottom plate 1, a cushion block 2 is fixed at the front end of the bottom plate 1, and a punch former 3 is fixed on the cushion block 2. The rocker arm 3.1 of the punch former 3 is in the front, and the three-jaw chuck 3.2 of the punch former 3 is in the rear. The front shaft 4.1 of the smooth rod section of the impeller 4 to be tested is clamped by the three-jaw chuck 3.2.

[0019] A rear plate 5 is provided at the rear end of the bottom plate 1, and an inserted shaft 6 is slidably fitted with the rear plate 5 in the front-rear direction. Specifically, the rear plate 5 is provided with a mounting hole, a linear bearing 7 is sleeved in the mounting hole, the rear flange 7.1 of the linear bearing 7 is screwed to the rear plate 5, and the inserted shaft 6 is slidably fitted in the linear bearing 7 in the axial direction. A convex column 8.2 is provided at the front end of the inserted shaft 6, and the convex column 8.2 can be inserted into the central hole of the rear shaft 4.2 of the threaded section of the impeller 4 to be tested. Specifically, a shaft cap 8 is sleeved at the front end of the inserted shaft 6, the shaft cap 8 is provided with a radial threaded hole 8.1, a fastening bolt is screwed into the radial threaded hole 8.1, and the fastening bolt abuts against the inserted shaft 6 to realize the fixation of the shaft cap 8 and the inserted shaft 6; the convex column 8.2 is fixed at the front end of the shaft cap 8, and the diameter of the convex column 8.2 is smaller than that of the inserted shaft 6 so as to be inserted into the central hole of the rear shaft 4.2 of the threaded section.

[0020] The base plate 1 is also provided with a universal magnetic base 9. The bottom of the universal magnetic base 9 is adsorbed on the steel base plate 1. The universal magnetic base 9 locks or unlocks each swing arm 9.2 of the base by tightening or loosening the adjusting screw 9.1. The chuck at the free end of the universal magnetic base 9 holds a dial indicator 10. An arc-shaped piece 13 for abutting against the outer arc surface of the blade 4.3 of the impeller 4 to be measured is fixed to the contact head of the dial indicator 10. The width of the arc-shaped piece 13 is greater than the distance between two adjacent blades 4.3 of the impeller 4.

[0021] Two chutes 11 extending in the front-back direction, that is, along the axial direction of the insertion shaft 6, are provided on the base plate 1. A U-shaped dust cover 12 is slidably fitted in the chutes 11, and a lifting ring 14 is welded to the upper end of the U-shaped dust cover 12.

[0022] The above-mentioned three-jaw punch former 3 and the universal magnetic base 9 are both commercially available mature components.

[0023] Of course, the above structure is only the preferred embodiment of the present application, and a series of changes are also allowed in the specific structure of the present application. For example, the punch former 3 is directly fixed on the base plate 1 without passing through the cushion block 2. In this way, the overall height of the tooling can be reduced, but the space for accommodating the universal magnetic base 9 will be reduced, and the base needs to be folded further; the insertion shaft 6 can be directly slidably sleeved in the central hole of the rear plate 5; the dust cover can also be not provided; and so on.

Claims

1. A water meter impeller test tooling, characterized in that: It includes a bottom plate. At the front end of the bottom plate, there is a punch former. The rocker arm of the punch former is in the front, and the three-jaw chuck of the punch former clamps the front shaft of the impeller to be measured. At the rear end of the bottom plate, there is a rear plate. A plug shaft is slidably fitted in the front-rear direction on the rear plate. A convex column is provided at the front end of the plug shaft, and the convex column is inserted into the central hole of the rear shaft of the impeller to be measured. The bottom plate is also provided with a universal magnetic base. The chuck at the free end of the universal magnetic base clamps a dial indicator. An arc-shaped piece for abutting against the outer arc surface of the blade of the impeller to be measured is fixed to the contact head of the dial indicator. The width of the arc-shaped piece is greater than the distance between two adjacent blades of the impeller.

2. The water meter impeller test tooling according to claim 1, characterized in that: The rear plate is provided with a mounting hole. A linear bearing is sleeved in the mounting hole. The rear flange of the linear bearing is screwed to the rear plate. The plug shaft is slidably fitted axially in the linear bearing. A shaft cap is sleeved at the front end of the plug shaft. The shaft cap is fixed to the plug shaft by a fastening bolt. The convex column is fixed to the front end of the shaft cap.

3. The water meter impeller testing tooling according to claim 1, characterized in that: The punch former is fixed to the bottom plate through a cushion block. There are two front-rear chutes on the bottom plate. A U-shaped dust cover is slidably fitted in the above chutes. A lifting ring is welded to the upper end of the U-shaped dust cover.

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