Impeller section height measuring gauge

Abstract

The utility model discloses an impeller cross section height measuring gauge which comprises a workbench, a rotatable base is arranged on the workbench, and the base fixes an impeller through a chuck, a threaded rod and a locking nut and drives the impeller to rotate. The adjusting assembly can adjust the position of the dial indicator in the X, Y and Z directions, the end part of a dial indicator probe is provided with a silicon nitride conical probe with a cone angle of 120 degrees and an outer edge thickness of 0.1 mm, and the outer edge of the silicon nitride conical probe is in contact with the impeller to measure the height. Circumferential array handles on the outer side of the base facilitate circumferential adjustment, and an adjusting seat below the workbench is provided with a cushioning pad to ensure horizontal stability. According to the testing fixture, the rotatable base is matched with the three-way adjusting assembly, rapid adjustment of the circumferential position of the section of the impeller and accurate positioning of the dial indicator are achieved, measurement angle deviation and surface contact interference are eliminated through the design of the conical probe, and wear resistance is improved through the silicon nitride material. The whole structure is modularized, the cost is low, the operation is simple and convenient, and the requirements of workshop online detection on precision, efficiency and practicability are met.

Description

Technical Field

[0001] This utility model relates to the field of impeller testing technology, specifically to an impeller cross-sectional height measuring tool. Background Technology

[0002] As a core component of fluid machinery, the geometric accuracy of the impeller directly affects key performance aspects such as equipment efficiency, noise level, and lifespan. In the field of impeller machining, accurate measurement of the fixed cross-sectional height is a crucial process for ensuring impeller quality. Especially in the production of open impellers, traditional testing methods struggle to balance accuracy, efficiency, and cost, necessitating specialized testing equipment to meet the online testing needs of the workshop.

[0003] Currently, impeller measurement technology is mainly divided into two categories:

[0004] Contact measurement: Represented by coordinate measuring machines (CMMs), this method acquires data by having a probe contact the impeller surface. While this technology offers high accuracy, the equipment is expensive and maintenance is complex, and it has stringent environmental requirements, making it unaffordable for small and medium-sized enterprises.

[0005] Non-contact measurement: technologies such as laser scanning and optical imaging can avoid physical contact, but the equipment cost is higher and the operation threshold is more complex.

[0006] Therefore, to address the above issues, there is a need for a low-cost, highly practical impeller cross-section height measuring tool suitable for workshop operating environments. Utility Model Content

[0007] Purpose of the utility model: In order to overcome the above shortcomings, the purpose of this utility model is to provide an impeller cross-section height measuring fixture. Through the coordinated cooperation of a rotatable base and a multi-directional adjustable dial indicator, the impeller cross-section height can be measured quickly and accurately. At the same time, by adopting a modular adjustment component and a wear-resistant conical probe design, the equipment cost is significantly reduced while ensuring measurement accuracy, thus meeting the practical needs of online inspection in the workshop.

[0008] Technical Solution: This utility model provides an impeller cross-section height measuring fixture, including a worktable with a rotatable base. A chuck is mounted on the worktable, and an impeller is held in place by the chuck. The base drives the impeller to rotate. An adjustment assembly and a dial indicator are also included. The dial indicator is mounted on the adjustment assembly and is used to adjust the position of the dial indicator in the X, Y, and Z directions. The dial indicator includes a body and a probe. The probe extends beyond the body and faces the worktable. The probe can extend and retract along the Z-direction. A cone-shaped probe is located at the end of the probe away from the body, and its outer edge contacts the impeller to measure the height of the contact area. The rotatable base and chuck on the worktable allow for circumferential position adjustment of the impeller's cross-section, meeting the measurement requirements for cross-section heights at different angles. The probe can extend and retract along the Z-axis, and in conjunction with the contact measurement of the cone-shaped probe, it directly obtains the height data of a specific part of the impeller cross-section. Different sized impellers can be installed interchangeably.

[0009] Furthermore, in this application, an impeller cross-section height measuring fixture is provided, wherein the probe has a cone angle of 120 degrees and an outer edge thickness of 0.1 mm, and is made of silicon nitride. Through a tapered structure at a specific angle, when the outer edge of the probe contacts the impeller surface, the contact line is along the generatrix of the cone, ensuring that the measuring force is perpendicular to the tangent direction of the point to be measured on the impeller cross-section. This achieves consistency between the probe axis and the measurement direction, avoiding cosine error caused by angular deviation (i.e., projection error caused by the non-perpendicularity of the measurement direction). The extremely thin 0.1 mm edge design reduces the contact area to a single point or micro-segment on the impeller surface, eliminating "surface contact" interference caused by an excessively large probe end face area, and accurately capturing the local height characteristics of the impeller cross-section. Silicon nitride has better pressure resistance. When in contact with softer materials, silicon nitride exhibits better wear resistance, avoiding the problem of aluminum shavings adhering.

[0010] Furthermore, in this application, an impeller cross-section height measuring fixture includes an adjustment assembly comprising four columns, a pair of horizontal bars, a vertical bar, a connecting rod, and a connector. The columns are vertically mounted on a worktable. The pair of horizontal bars are perpendicular to the columns and parallel to each other, connected to the columns via the connector. The horizontal bars are adjustable along the Z-axis of the columns. The vertical bar is positioned between the pair of horizontal bars, connected via the connector, and perpendicular to the horizontal bars. The vertical bar is adjustable along the X-axis of the horizontal bars. One end of the connecting rod is connected to the vertical bar via the connector, and the other end is connected to a dial indicator via the connector. The connecting rod is adjustable along the Y-axis of the vertical bar. X, Y, and Z-axis adjustments are achieved by sliding the horizontal bars, vertical bars, and connecting rod on their respective guide rails. Adjustment in any direction does not affect positioning in other directions.

[0011] Furthermore, in this application, an impeller cross-section height measuring fixture includes a set of handles mounted in a circumferential array on the outer side of the base. By rotating the handles and coordinating with the probe, the height of the corresponding part of the impeller is measured. The handles in the circumferential array allow the operator to complete the full circumferential cross-section measurement of the impeller without moving around the workbench.

[0012] Furthermore, in this application, an impeller cross-section height measuring fixture includes a threaded rod with its center facing upwards on the base. The threaded rod passes through the chuck and the impeller, extending beyond the impeller. A locking nut secures the impeller to the chuck. The threaded rod is vertically positioned at the center of the base, serving as the axial reference for impeller installation. Its axis is perfectly aligned with the rotation axis of the base, ensuring that the rotation center of the cross-section to be measured after impeller installation coincides with the theoretical geometric center, thus avoiding circumferential height measurement deviations caused by eccentricity. The locking nut provides axial clamping to prevent the impeller from shifting along the Z-axis during measurement.

[0013] Furthermore, in one impeller cross-section height measuring fixture of this application, a set of adjusting seats is installed below the worktable. These adjusting seats are used to adjust the horizontal height of the worktable, and a shock-absorbing pad is installed at the bottom of each adjusting seat. Four adjusting seats are distributed at the four corners of the worktable and can be independently raised and lowered via threaded connections. The shock-absorbing pad is made of nitrile rubber-aluminum alloy.

[0014] As can be seen from the above technical solution, this utility model has the following beneficial effects:

[0015] 1. The impeller cross-section height measuring fixture of this utility model is fixed by the cooperation of a rotatable base and a chuck, which drives the impeller to rotate. Combined with the adjustment component, the position of the dial indicator can be precisely adjusted in the X, Y, and Z directions, realizing flexible adjustment of the circumferential position of the impeller cross-section to be measured and rapid positioning of the dial indicator probe. It can meet the measurement needs of cross-section height at different angles, without the need for expensive coordinate measuring machines or non-contact measuring equipment, significantly reducing equipment costs. Moreover, it is easy to operate and suitable for the practical needs of online inspection in the workshop.

[0016] 2. The impeller cross-section height measuring fixture of this utility model designs the probe as a conical structure with a cone angle of 120 degrees and an outer edge thickness of 0.1 mm, and is made of silicon nitride material. This ensures that the measuring force is perpendicular to the tangent direction of the impeller cross-section to be measured, avoiding cosine error. At the same time, the contact area is reduced to a single point or micro-segment, eliminating "surface contact" interference and realizing accurate capture of the local height characteristics of the impeller cross-section. In addition, the silicon nitride material has good wear resistance, avoiding problems such as aluminum shavings adhering, improving measurement accuracy and the service life of the fixture. The modular adjustment components also facilitate maintenance and adjustment, further reducing the cost of use. Attached Figure Description

[0017] Figure 1This is a schematic diagram of the structure of a measuring fixture for measuring the height of an impeller cross section according to the present invention;

[0018] Figure 2 for Figure 1 Enlarged view of region A in the middle;

[0019] Figure 3 This is an example diagram of a standard block.

[0020] Explanation of reference numerals in the instruction manual:

[0021] 1-Workbench;

[0022] 2-Base;

[0023] 3-Chuck;

[0024] 4-Adjusting component, 41-Column, 42-Horizontal bar, 43-Vertical bar, 44-Connecting rod, 45-Connector;

[0025] 5-Digital gauge, 51-Gauge body, 52-Probe, 53-Probe;

[0026] 6-Adjustable seat, 61-Shock-absorbing pad. Detailed Implementation

[0027] The present invention will be further explained below with reference to the accompanying drawings and specific embodiments.

[0028] Example 1

[0029] like Figure 1-3 The impeller cross-section height measuring fixture shown includes a worktable 1, on which a rotatable base 2 is mounted. A chuck 3 is mounted on the base 2 to fix the impeller. Three handles 21 are arranged in a circular array on the outer side of the base 2 to facilitate manual rotation of the base 2 to adjust the impeller angle. A threaded rod 22 is provided at the center of the base 2, extending through the chuck 3 and the impeller, and extending beyond the impeller. The impeller is tightened onto the chuck 3 by a locking nut 23 to ensure a stable impeller installation.

[0030] A set of adjustment seats 6 is installed below the worktable 1. The bottom of the adjustment seats 6 is equipped with a vibration damping pad 61, used to adjust the horizontal height of the worktable 1 and reduce vibration interference. The adjustment assembly 4 is installed on the worktable 1 and includes four uprights 41, a pair of crossbars 42, a vertical bar 43, a connecting rod 44, and a connector 45. The uprights 41 are vertically fixed to the worktable 1. The crossbars 42 are connected to the uprights 41 via the connector 45 and can be adjusted and moved in the Z-axis direction. The vertical bar 43 is located between the pair of crossbars 42 and connected via the connector 45, and can slide along the crossbars 42 in the X-direction. One end of the connecting rod 44 is connected to the vertical bar 43 via the connector 45, and the other end is connected to the dial indicator 5 via the connector 45. The connecting rod 44 can slide along the vertical bar 43 in the Y-direction, thereby achieving precise positioning of the dial indicator 5 in the X, Y, and Z directions.

[0031] The dial indicator 5 is an electronic display type, including a body 51 and a probe 52. The probe 52 extends out of the body 51 and faces the worktable 1. The probe 52 can be extended and retracted along the Z direction. The end of the probe 52 is provided with a probe 53, which is conical with a cone angle of 120 degrees and an outer edge thickness of 0.1 mm. It is made of silicon nitride to ensure measurement accuracy and wear resistance.

[0032] The specific usage process is as follows:

[0033] 1. Calibrate the dial indicator: Install the standard block on the chuck 3 and tighten it using the locking nut 23. Manually adjust the adjusting assembly 4, moving the crossbar 42, the vertical bar 43, and the connecting rod 44 until the probe 53 of the dial indicator 5 contacts the outer edge of the standard block. Press the zeroing button on the electronic digital dial indicator 5 to complete the calibration.

[0034] 2. Install the impeller: Remove the standard block, install the impeller to be tested on the chuck 3, and tighten it with the lock nut 23. Rotate the handle 21 on the base 2 to adjust the impeller to the target cross-section position, and confirm that there is no interference in the movement path of the probe 53.

[0035] 3. Data Acquisition: Lower probe 52 until probe 53 contacts the impeller curved surface. The electronic digital dial indicator 5 displays the current height value, which is then recorded. By rotating base 2 with handle 21, the height values ​​of other sections of the impeller are measured and recorded one by one, completing the full circumferential section height measurement.

[0036] The above embodiments are exemplary and are intended to illustrate the technical concept and features of this utility model, so that those skilled in the art can understand the content of this utility model and implement it accordingly. They should not be construed as limiting the scope of protection of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be covered within the scope of protection of this utility model.

Claims

1. A measuring fixture for measuring the height of an impeller cross-section, characterized in that: include: A workbench (1) is provided with a rotatable base (2), a chuck (3) is provided on the base (2), an impeller is mounted on the chuck (3), and the base (2) drives the impeller to rotate. Adjustment assembly (4) and dial indicator (5). The dial indicator (5) is mounted on the adjustment assembly (4). The adjustment assembly is used to adjust the position of the dial indicator (5) in the X, Y and Z directions. The dial indicator (5) includes a body (51) and a probe (52). The probe (52) extends out of the body (51) and faces the worktable (1). The probe (52) can move telescopically in the Z direction. The end of the probe (52) away from the body (51) is provided with a probe (53). The probe (53) is conical. The outer edge of the conical shape contacts the impeller and is used to measure the height of the contact part.

2. The impeller cross-section height measuring fixture according to claim 1, characterized in that, The probe (53) has a cone angle of 120 degrees and an outer edge thickness of 0.1 mm, and is made of silicon nitride.

3. The impeller cross-section height measuring fixture according to claim 1, characterized in that, The adjustment assembly (4) includes four columns (41), a pair of horizontal bars (42), a vertical bar (43), a connecting rod (44), and a connector (45). The columns (41) are vertically installed on the workbench (1). The pair of horizontal bars (42) are perpendicular to the columns (41). The two horizontal bars (42) are parallel to each other and connected to the columns (41) through the connector (45). The horizontal bars (42) can be adjusted along the columns (41) in the Z-axis direction. The vertical bar (43) is located between the pair of horizontal bars (42), connected through the connector (45), and perpendicular to the horizontal bars (42). The vertical bar (43) can be adjusted along the horizontal bars (42) in the X-direction. One end of the connecting rod (44) is connected to the vertical bar (43) through the connector (45), and the other end is connected to the dial indicator (5) through the connector (45). The connecting rod (44) can be adjusted along the vertical bar (43) in the Y-direction.

4. The impeller cross-section height measuring fixture according to claim 1, characterized in that, A set of handles (21) is installed on the outer circumferential array of the base (2). By rotating the handles (21) in conjunction with the probe (53), the height of the corresponding part of the impeller is measured.

5. The impeller cross-section height measuring fixture according to claim 1, characterized in that, The base (2) has a threaded rod (22) with the center facing upward. The threaded rod (22) passes through the chuck (3) and the impeller and extends out of the impeller. The impeller is tightened onto the chuck (3) by a locking nut (23).

6. The impeller cross-section height measuring fixture according to claim 1, characterized in that, A set of adjustment seats (6) is installed below the workbench (1). The set of adjustment seats (6) is used to adjust the horizontal height of the workbench (1). A shock-absorbing pad (61) is installed at the bottom of the adjustment seat (6).

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