Checking fixture and method for comparing and measuring center distance of bearing bush hole of base assembly

Abstract

The invention discloses a contrast measurement gauge and method for the center distance of a bearing bush hole of a base assembly. Comprising a testing fixture seat (1), a long centering shaft (2) and a short centering shaft (3) are installed on the testing fixture seat (1), the head end of the long centering shaft and the head end of the short centering shaft are each provided with a conical surface section, each conical surface section is sleeved with a positioning expansion sleeve (4), and the head end of each conical surface section penetrates out of the corresponding positioning expansion sleeve (4) to be in threaded connection with a tensioning nut (5); the tail end of the long centering shaft (2) penetrates through the testing fixture seat (1) and is connected with the limiting assembly (6), the tail end of the short centering shaft (3) penetrates through the testing fixture seat (1), a measuring through hole (7) is formed in the side wall of the testing fixture seat (1), a measuring meter (8) is placed in the measuring through hole (7), and a measuring head of the measuring meter (8) can penetrate through the measuring through hole (7) to abut against the side wall of the tail end of the short centering shaft (3). And the short centering shaft (3) is in clearance fit with the gauge seat (1). Whether the center distance of the bearing bush hole of the base assembly is qualified or not can be efficiently and accurately detected, and the rapid measurement problem of a production field is solved.

Description

Technical Field

[0001] The invention belongs to the technical field of process equipment measuring fixture design, and in particular relates to a comparative measurement fixture and method for the center distance of bearing bush holes of a base assembly. Background Art

[0002] There are two bearing holes on the base assembly of a certain aviation lubricating oil pump product. The center distance of the two bearing holes is required to be highly accurate with a tolerance of 0.02. If a general measuring tool is used for measurement, the dimensions of multiple elements need to be measured and calculated, and the cumulative error is large. If other electronic measuring instruments or pneumatic measuring instruments are used for detection, they cannot meet the measurement requirements at the processing station. In view of the above series of reasons, it is necessary to design a measuring fixture that is easy to operate and reliable for use at the processing station.

[0003] The invention patent with application number CN202311845346.7 and publication number CN117804312A discloses "a tool and method for measuring the center distance of the mounting hole of a slewing bearing", which consists of a measuring ruler body, a first ruler head assembly (including a first moving block and a first limit clamp connected thereto), a second ruler head assembly (including a second moving block and a second limit clamp connected thereto), a first spring, a second spring, a measuring gauge and a measuring gauge fixing member. During measurement, the first limit clamp cooperates with one mounting hole, the second limit clamp cooperates with the other, and the measuring end of the measuring gauge abuts against the second limit clamp to calibrate the center distance between the two mounting holes. Its principle is to place two steel balls at the orifice to simulate the center position of the two holes, and then use the tool to clamp the two steel balls, and read the center distance change value from the dial indicator. It can be seen that the processing condition of the orifice of the bearing mounting hole has a great influence on the measurement result, and the tool and method are not applicable to our unit's products. Summary of the invention

[0004] The purpose of the present invention is to provide a comparative measuring fixture and method for the center distance of the bearing bush holes of a base assembly. The present invention can efficiently and accurately detect whether the center distance of the bearing bush holes of the base assembly is qualified, so as to solve the problem of rapid measurement at the production site.

[0005] The technical solution of the present invention is: a comparative measurement gauge for the center distance of the bearing hole of a base assembly, comprising a gauge seat, a long centering shaft and a short centering shaft are installed on the gauge seat, the head ends of the long centering shaft and the short centering shaft are both provided with a conical section, a positioning expansion sleeve is sleeved on the conical section, the head end of the conical section passes through the positioning expansion sleeve and is threadedly connected with a tension nut; the tail end of the long centering shaft passes through the gauge seat and is connected with a limit assembly, the tail end of the short centering shaft penetrates the gauge seat, a measuring through hole is provided on the side wall of the gauge seat, a measuring gauge is placed in the measuring through hole, and the measuring head of the measuring gauge can pass through the measuring through hole and abut against the side wall of the tail end of the short centering shaft; the short centering shaft and the gauge seat are clearance-matched.

[0006] In the aforementioned comparative measuring fixture for the center distance of the bearing hole of the base assembly, a spring is provided between the tail end of the conical surface section and the positioning expansion sleeve.

[0007] In the aforementioned comparative measuring fixture for the center distance of the bearing hole of the base assembly, a set screw is provided on the fixture seat for fixing the measuring gauge in the measuring hole.

[0008] In the aforementioned comparative measuring fixture for the center distance of the bearing hole of the base assembly, the limit assembly includes a movable bearing and two fixed bearings located on the bottom surface of the fixture seat. The three bearings are arranged in a triangle and can all abut against the side wall of the tail end of the long centering shaft; the movable bearing is connected to the driving assembly, and the movable bearing can be driven by the driving assembly to move radially along the long centering shaft. Each bearing is covered with a shield.

[0009] In the aforementioned comparative measurement fixture for the center distance of the bearing hole of the base assembly, the driving assembly includes a sliding plate that can slide in the gauge seat along the radial direction of the long centering axis, and an adjusting rod threadedly connected to the side wall of the gauge seat; the outer end of the sliding plate is provided with a linkage groove, the adjusting rod body is provided with a linkage boss, the linkage groove is connected to the linkage boss; the inner end of the sliding plate is connected to the movable bearing.

[0010] The aforementioned comparative measuring fixture for the center distance of the bearing hole of the base assembly also includes a table piece, which is provided with a pair of centering holes matching the positions of the long centering shaft and the short centering shaft.

[0011] In the aforementioned comparative measuring fixture for the center distance of the bearing hole of the base assembly, a bushing is provided in the centering hole.

[0012] The aforementioned measuring method of the comparative measuring fixture for the center distance of the bearing hole of the base assembly is as follows: before measuring, the position of the long centering shaft and the measuring gauge is confirmed, and after confirmation, the long centering shaft is fixed by using the limit assembly, and the position of the measuring gauge is fixed synchronously to complete the calibration; after calibration, the bearing hole of the base assembly to be measured is installed on the positioning expansion sleeve accordingly, and then the tensioning nut is tightened to expand the positioning expansion sleeve in the corresponding bearing hole, so that the base assembly to be measured is fixed to the long centering shaft and the short centering shaft; at this time, the base assembly to be measured is swung around the long centering shaft, and the indication of the pointer of the measuring gauge is observed to see whether it is within the required tolerance range, thereby completing the inspection of the base assembly.

[0013] In the aforementioned measuring method of the comparative measuring fixture for the center distance of the bearing hole of the base assembly, the calibration process is as follows: insert the long and short centering shafts into the centering holes of the matching parts correspondingly, tighten the tensioning nut to fit the outer cylindrical surface of the positioning expansion sleeve with the centering hole of the matching parts without gap to complete the assembly; after the assembly, insert the long and short centering shafts into the inspection fixture seat accordingly, and then use the limit assembly to clamp the tail end of the long centering shaft; correspondingly, insert the measuring gauge through the measuring through hole so that the measuring head is against the side wall of the tail end of the short centering shaft; swing the matching parts around the long and short centering shafts, and observe whether the pressure gauge of the measuring gauge measuring head is appropriate. If it is appropriate, directly align the measuring gauge to zero, otherwise adjust the pressure gauge position of the measuring gauge measuring head and align the micrometer to zero; after zeroing, remove the matching parts to complete the calibration.

[0014] The advantages of the present invention are: through the application of the comparative measurement inspection fixture for the center distance of the bearing holes of the base assembly of the present invention, the problem of detecting the high-precision center distance between the two bearing holes on the base assembly of a certain aviation lubricating oil pump product is well solved, and it is economical and practical, and has high measurement accuracy, and the accuracy can reach 0.01mm. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a three-dimensional cross-sectional view of the present invention;

[0016] Figure 2 It is a front view of the present invention;

[0017] Figure 3 for Figure 1 Bottom view of . DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0019] The features and illustrative embodiments of various aspects of the present invention will be described in detail below. In the detailed description below, many specific details are proposed to provide a comprehensive understanding of the present invention. However, it is obvious to those skilled in the art that the present invention can be implemented without the need for some of these specific details. The following description of the embodiments is only to provide a better understanding of the present invention by illustrating examples of the present invention. The present invention is by no means limited to any specific settings and methods proposed below, but covers any improvements, replacements and modifications of structures, methods, devices without departing from the spirit of the present invention. In the accompanying drawings and the following description, known structures and technologies are not shown to avoid unnecessary ambiguity in the present invention.

[0020] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other, and the embodiments can refer to and quote each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0021] Example 1. A comparative measurement fixture and method for the center distance of the bearing hole of the base assembly, see Figure 1-3 , including a gauge seat 1, on which a long centering shaft 2 and a short centering shaft 3 are installed, the head ends of the long centering shaft and the short centering shaft are both provided with a conical section, on which a positioning expansion sleeve 4 is sleeved, and the head end of the conical section passes through the positioning expansion sleeve 4 and is threadedly connected with a tightening nut 5; the tail end of the long centering shaft 2 passes through the gauge seat 1 and is connected with a limit assembly 6, and the tail end of the short centering shaft 3 penetrates the gauge seat 1, and a measuring hole 7 is provided on the side wall of the gauge seat 1, in which a measuring gauge 8 is placed, and the measuring head of the measuring gauge 8 can pass through the measuring hole 7 and rest against the side wall of the tail end of the short centering shaft 3; the short centering shaft 3 is clearance-matched with the gauge seat 1.

[0022] A spring 9 is provided between the tail end of the aforementioned conical surface section and the positioning expansion sleeve 4 .

[0023] The aforementioned gauge seat 1 is provided with a set screw 10 for fixing the measuring gauge 8 in the measuring hole 7. The measuring gauge 8 is a measuring reading instrument, which can be a micrometer or a vernier gauge. Insert it into the measuring hole 7, and screw the set screw 10 in the screw hole of the gauge seat 1 to tighten or loosen the micrometer 18. Depending on the level of the tolerance requirements of the measured size, the micrometer 18 can also be a vernier gauge.

[0024] The aforementioned limiter assembly 6 includes a movable bearing 6.1 and two fixed bearings 6.2 located on the bottom surface of the gauge seat 1. The three bearings are arranged in a triangle and can all abut against the side wall of the tail end of the long centering shaft 2. The movable bearing 6.1 is connected to the drive assembly, and the movable bearing 6.1 can be driven by the drive assembly to move radially along the long centering shaft 2. Each bearing is covered with a protective cover 6.7. The three bearings are based on the principle of three points (lines) determining a circle (cylinder) to achieve clamping and positioning of the long centering shaft 4.

[0025] The aforementioned driving assembly includes a sliding plate 6.3 that can slide radially along the long centering shaft 2 in the gauge seat 1, and an adjusting rod 6.4 that is threadedly connected to the side wall of the gauge seat 1; the outer end of the sliding plate 6.3 is provided with a linkage groove 6.5, and the rod body of the adjusting rod 6.4 is provided with a linkage boss 6.6, and the linkage groove 6.5 is connected to the linkage boss 6.6; the inner end of the sliding plate 6.3 is connected to the movable bearing 6.1. The driving process is as follows: rotate the adjusting rod 6.4 to make the adjusting rod 6.4 move axially, and under the cooperation of the linkage boss 6.6 and the linkage groove 6.5, the sliding plate 6.3 is driven to move radially along the long centering shaft 2, thereby driving the movable bearing 6.1 to move, so that the movable bearing 6.1 and the fixed bearing 6.2 clamp / release the side wall of the tail end of the long centering shaft 2.

[0026] The aforementioned comparative measurement jig for the center distance of the bearing hole of the base assembly also includes a table piece 11, on which a pair of centering holes matching the positions of the long centering shaft and the short centering shaft are provided.

[0027] A bushing 12 is arranged in the aforementioned centering hole. This structure can slow down the wear of the centering hole.

[0028] The aforementioned measuring method of the comparative measuring fixture for the center distance of the bearing hole of the base assembly is as follows: before measuring, the positions of the long centering shaft 2 and the measuring gauge 8 are confirmed, and after confirmation, the long centering shaft 2 is fixed using the limit assembly 6, and the position of the measuring gauge 8 is fixed synchronously to complete the calibration; after calibration, the bearing hole of the base assembly to be measured is installed on the positioning expansion sleeve 4 accordingly, and then the tensioning nut 5 is tightened to expand the positioning expansion sleeve 4 in the corresponding bearing hole, so that the base assembly to be measured is fixed to the long centering shaft and the short centering shaft; at this time, the base assembly to be measured is swung around the long centering shaft 2, and the pointer indication of the measuring gauge 8 is observed to see whether it is within the required tolerance range, thereby completing the detection of the base assembly.

[0029] The calibration process is as follows: insert the long and short centering shafts into the centering holes of the alignment piece 11 accordingly, tighten the tensioning nut 5 to fit the outer cylindrical surface of the positioning expansion sleeve 4 with the centering hole of the alignment piece 11 without gap to complete the assembly; after the assembly, insert the long and short centering shafts into the gauge seat 1 accordingly, and then use the limit assembly 6 to clamp the tail end of the long centering shaft 2; correspondingly, insert the measuring gauge 8 through the measuring through hole 7, so that the measuring head is against the side wall of the tail end of the short centering shaft 3; make the alignment piece 9 swing around the long and short centering shafts, and observe whether the pressure gauge of the measuring head of the measuring gauge 8 is appropriate. If it is appropriate, directly align the measuring gauge 8 to zero, otherwise adjust the pressure gauge position of the measuring head of the measuring gauge 8, and align the micrometer 18 to zero; after zeroing, remove the alignment piece 11 to complete the calibration.

[0030] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the field can easily think of various equivalent modifications or substitutions within the technical scope disclosed by the present invention, and these modifications or substitutions should all be covered within the protection scope of the present invention.

Claims

1. A comparative measuring fixture for the center distance of bearing holes of a base assembly, characterized in that: The invention comprises a gauge seat (1), on which a long centering shaft (2) and a short centering shaft (3) are installed, the head ends of the long centering shaft and the short centering shaft are both provided with a conical section, a positioning expansion sleeve (4) is sleeved on the conical section, the head end of the conical section passes through the positioning expansion sleeve (4) and is threadedly connected with a tensioning nut (5); the tail end of the long centering shaft (2) passes through the gauge seat (1) and is connected with a limit assembly (6), the tail end of the short centering shaft (3) passes through the gauge seat (1), a measuring through hole (7) is provided on the side wall of the gauge seat (1), a measuring gauge (8) is placed in the measuring through hole (7), and the measuring head of the measuring gauge (8) can pass through the measuring through hole (7) and abut against the side wall of the tail end of the short centering shaft (3); the short centering shaft (3) and the gauge seat (1) are clearance-matched.

2. The comparative measuring jig for the center distance of the bearing bushing holes of the base assembly according to claim 1 is characterized in that: A spring (9) is provided between the tail end of the conical surface section and the positioning expansion sleeve (4).

3. The comparative measuring jig for the center distance of the bearing bushing holes of the base assembly according to claim 1 is characterized in that: A set screw (10) is provided on the gauge seat (1) for fixing a measuring gauge (8) in the measuring hole (7).

4. The comparative measuring jig for the center distance of the bearing bushing holes of the base assembly according to claim 1 is characterized in that: The limit assembly (6) includes a movable bearing (6.1) and two fixed bearings (6.2) located on the bottom surface of the gauge seat (1). The three bearings are arranged in a triangle and can abut against the side wall of the tail end of the long centering shaft (2). The movable bearing (6.1) is connected to the driving assembly, and the movable bearing (6.1) can be driven by the driving assembly to move radially along the long centering shaft (2). Each bearing is covered with a protective cover (6.7).

5. The comparative measuring jig for the center distance of the bearing bushing holes of the base assembly according to claim 4 is characterized in that: The driving assembly comprises a sliding plate (6.3) which can slide radially along the long centering shaft (2) in the gauge seat (1), and an adjusting rod (6.4) threadedly connected to the side wall of the gauge seat (1); a linkage groove (6.5) is provided at the outer end of the sliding plate (6.3), a linkage boss (6.6) is provided on the rod body of the adjusting rod (6.4), and the linkage groove (6.5) is connected to the linkage boss (6.6); and the inner end of the sliding plate (6.3) is connected to the movable bearing (6.1).

6. The comparative measuring jig for the center distance of the bearing bushing holes of the base assembly according to claim 1 is characterized in that: It also comprises a table alignment part (11), on which a pair of centering holes matching the positions of the long centering shaft and the short centering shaft are provided.

7. The comparative measuring jig for the center distance of the bearing bushing holes of the base assembly according to claim 6 is characterized in that: A bushing (12) is arranged in the centering hole.

8. A method for measuring the center distance of bearing holes of a base assembly using a comparative measuring fixture as claimed in any one of claims 1 to 7, characterized in that: Before measuring, the positions of the long centering shaft (2) and the measuring gauge (8) are confirmed. After confirmation, the long centering shaft (2) is fixed using the limit assembly (6), and the position of the measuring gauge (8) is fixed synchronously to complete the calibration. After the calibration, the bearing hole of the base assembly to be measured is installed on the positioning expansion sleeve (4) accordingly, and then the tensioning nut (5) is tightened to expand the positioning expansion sleeve (4) in the corresponding bearing hole, so that the base assembly to be measured is fixed to the long centering shaft and the short centering shaft. At this time, the base assembly to be measured is swung around the long centering shaft (2) to observe whether the pointer indication of the measuring gauge (8) is within the required tolerance range, thereby completing the detection of the base assembly.

9. The measuring method of the comparative measuring jig for measuring the center distance of the bearing bushing holes of the base assembly according to claim 8, characterized in that: The calibration process is as follows: insert the long and short centering shafts into the centering holes of the alignment piece (11) correspondingly, tighten the tensioning nut (5) to fit the outer cylindrical surface of the positioning expansion sleeve (4) with the centering hole of the alignment piece (11) without gap to complete the assembly; after the assembly, insert the long and short centering shafts into the inspection fixture seat (1) correspondingly, and then use the limit assembly (6) to clamp the tail end of the long centering shaft (2); correspondingly, insert the measuring gauge (8) through the measuring through hole (7) so that the measuring head abuts against the side wall of the tail end of the short centering shaft (3); make the alignment piece (9) swing around the long and short centering shafts, and observe whether the pressure gauge of the measuring head of the measuring gauge (8) is appropriate. If it is appropriate, directly align the measuring gauge (8) to zero, otherwise adjust the pressure gauge position of the measuring head of the measuring gauge (8) and align the micrometer (18) to zero; after the zeroing is completed, remove the alignment piece (11) to complete the calibration.

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