Three-point contact type measuring tool for detecting pitch diameter of nut

Abstract

The utility model discloses a three-point contact type measuring tool for detecting the pitch diameter of a nut. The three-point contact type measuring tool comprises a dial indicator, a fixed part and a movable part, the dial indicator is installed on the fixed part, the fixed part is provided with a guide unit, and the movable part can linearly move along the guide unit; the conduction unit of the moving part is supported on the measuring head of the dial indicator; the fixed part is provided with a two-point contact detection head, and the movable part is provided with a single-point contact detection head; two standard measuring balls are detachably mounted on the two-point contact detection head; the single-point contact detection head is detachably provided with a single standard measurement ball. According to the utility model, the problems of inaccurate detection and measurement errors caused by human factors in the original two-point measurement method are solved to a certain extent.

Description

Technical Field

[0001] This utility model belongs to the field of ball screw pair ball nut testing technology, and particularly relates to a three-point contact measuring tool for testing the mean diameter of the nut. Background Technology

[0002] Currently, the two-point measurement method is used to inspect the pitch diameter of ball nuts. This involves using two standard-sized ball probes that act on the raceway, and replacing them with standard pitch probes. Before measurement, a standard thread gauge is used for calibration (this introduces the first random error due to different measurement methods). After successful calibration, the raceway of the ball nut is measured (this introduces the second random error). Due to the random errors generated during calibration and inspection, the data obtained by different personnel for the same nut are inconsistent. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a three-point contact measuring tool for detecting the mean diameter of nuts, which addresses the shortcomings of the existing technology and solves to a certain extent the problems of inaccurate detection and measurement errors caused by human factors in the original two-point measurement method.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is: a three-point contact measuring tool for detecting the mean diameter of a nut, comprising a dial indicator, a fixed part, and a moving part; the dial indicator is mounted on the fixed part, the fixed part has a guide unit, the moving part is mounted on the guide unit, and the moving part can move linearly along the guide unit;

[0005] The moving part has a transmission unit, which is supported on the measuring head of the dial indicator;

[0006] The fixed part has a two-point contact detection head, and the moving part has a single-point contact detection head;

[0007] The two-point contact detection head and the single-point contact detection head are arranged opposite to each other;

[0008] Two standard measuring balls are detachably mounted on the two-point contact detection head, and the positions of the two standard measuring balls on the two-point contact detection head are adjustable.

[0009] A single standard measuring ball is detachably mounted on the single-point contact detection head, and the position of the standard measuring ball on the single contact detection head is adjustable.

[0010] When the moving part moves linearly along the guide unit, the distance between the single-point contact detection head and the two-point contact detection head changes, and the support of the micrometer measuring head by the transmission unit moves.

[0011] The aforementioned three-point contact measuring tool for detecting the mean diameter of a nut has two standard measuring balls magnetically attached to a two-point contact detection head, and one standard measuring ball magnetically attached to a single-point contact detection head.

[0012] The aforementioned three-point contact measuring tool for detecting the mean diameter of a nut includes a fixing part comprising a measuring rod, a spring, and a fixing block, and a guiding unit comprising a guide rod.

[0013] The dial indicator is installed at the left end of the measuring rod, and the measuring head of the dial indicator is inserted into the measuring space inside the measuring rod.

[0014] The left end of the transmission unit is inserted into the measuring space inside the measuring rod from the right end of the measuring rod, and is supported on the test head of the dial indicator.

[0015] The spring is installed in the measuring space, with its two ends supported by the inner wall of the measuring space and the end of the conducting unit, respectively.

[0016] The fixing block is installed at the right end of the measuring rod and is sleeved on the outside of the transmission unit;

[0017] The two-point contact detection head is mounted on the fixed block, and the guide rod is mounted on the fixed block.

[0018] The aforementioned three-point contact measuring tool for detecting the mean diameter of a nut further includes a guide sleeve in the guide unit. The guide sleeve is sleeved on the outside of the transmission unit, and the left end of the guide sleeve is detachably mounted on the right end of the measuring rod.

[0019] The above-mentioned three-point contact measuring tool for detecting the mean diameter of nuts includes a moving part comprising a moving block and a tail sleeve, the tail sleeve being mounted on the right side of the moving part, and the moving block having a first guide hole and a second guide hole.

[0020] The first guide hole is for the guide rod to pass through, and the second guide hole is for the guide sleeve to pass through;

[0021] The tail sleeve and the right end of the transmission unit are installed and fixed.

[0022] The aforementioned three-point contact measuring tool for detecting the mean diameter of a nut has a pull rod as its transmission unit.

[0023] The aforementioned three-point contact measuring tool for detecting the mean diameter of a nut has linear bearings installed in both the first guide hole and the second guide hole.

[0024] Compared with the prior art, this utility model has the following advantages: By increasing the contact point for measuring the mean diameter of the ball nut, this utility model is more stable, provides more accurate readings, and has less error than the original two-point contact measurement. Furthermore, the lead can be automatically adjusted, eliminating the need for frequent replacement of the detection head, thus improving detection efficiency and increasing the accuracy of the detection data.

[0025] The technical solution of this utility model will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of this utility model.

[0027] Figure 2 This is a cross-sectional structural diagram of the present invention.

[0028] Figure 3 This is a schematic diagram illustrating the use of this utility model.

[0029] Explanation of reference numerals in the attached figures:

[0030] 1—Digital indicator; 2—Measuring rod; 3—Spring;

[0031] 4—Fixed block; 5—Guide rod; 6—Moving block;

[0032] 7—Tail sleeve; 8—Fixing nut; 9—Pull rod;

[0033] 10—Two-point contact detection head; 11—Single-point contact detection head; 12—Standard measuring ball;

[0034] 13—Linear bearing; 14—Guide sleeve. Detailed Implementation

[0035] like Figure 1 As shown, a three-point contact measuring tool for detecting the mean diameter of a nut includes a dial indicator 1, a fixed part, and a moving part; the dial indicator 1 is mounted on the fixed part, the fixed part has a guide unit, the moving part is mounted on the guide unit, and the moving part can move linearly along the guide unit; the moving part has a transmission unit, and the transmission unit is a pull rod 9. The pull rod 9 supports the measuring head of the dial indicator 1; the fixed part has a two-point contact detection head 10, and the moving part has a single-point contact detection head 11; the two-point contact detection head 10 and the single-point contact detection head 11 are arranged opposite to each other; two standard measuring balls 12 are detachably installed on the two-point contact detection head 10, and the positions of the two standard measuring balls 12 on the two-point contact detection head 10 are adjustable; a single standard measuring ball 12 is detachably installed on the single-point contact detection head 11, and the position of the standard measuring ball 12 on the single contact detection head is adjustable; when the moving part moves linearly along the guide unit, the distance between the single-point contact detection head 11 and the two-point contact detection head 10 changes, and the support of the pull rod 9 on the measuring head of the dial indicator 1 moves.

[0036] In this embodiment, two standard measuring balls 12 are magnetically attached to a two-point contact detection head 10, and one standard measuring ball 12 is magnetically attached to a single-point contact detection head 11.

[0037] In this embodiment, the fixing part includes a measuring rod 2, a spring 3, and a fixing block 4; the guiding unit includes a guide rod 5; the dial indicator 1 is installed at the left end of the measuring rod 2, and the detection head of the dial indicator 1 is inserted into the measuring space inside the measuring rod 2; the left end of the pull rod 9 is inserted into the measuring space inside the measuring rod 2 from the right end of the measuring rod 2, and supports the detection head of the dial indicator 1; the spring 3 is installed in the measuring space, and the two ends of the spring 3 support the inner wall of the measuring space and the end of the pull rod 9, respectively; the fixing block 4 is installed at the right end of the measuring rod 2, and the fixing block 4 is sleeved on the outside of the pull rod 9; the two-point contact detection head 10 is installed on the fixing block 4, and the guide rod 5 is installed on the fixing block 4.

[0038] In this embodiment, the guiding unit further includes a guide sleeve 14, which is sleeved on the outside of the pull rod 9, and the left end of the guide sleeve 14 is detachably installed on the right end of the measuring rod 2.

[0039] In this embodiment, the moving part includes a moving block 6 and a tail sleeve 7. The tail sleeve 7 is installed on the right side of the moving part. The moving block 6 has a first guide hole and a second guide hole. The first guide hole is for the guide rod 5 to pass through, and the second guide hole is for the guide sleeve 14 to pass through. The tail sleeve 7 and the right end of the pull rod 9 are fixedly installed.

[0040] In this embodiment, linear bearings 13 are provided in both the first guide hole and the second guide hole.

[0041] This invention is a three-point contact measuring tool designed to eliminate the deviations that occur during the measurement process in existing two-point measurement methods.

[0042] This utility model comprises a dial indicator 1, a measuring rod 2, a fixed block 4, a moving block 6, a guide rod 5, a pull rod 9, a tail sleeve 7, a spring 3, a two-point contact detection head 10, a single-point contact detection head 11, a standard measuring ball 12, and a linear bearing 13. The fixed block 4 is equipped with the measuring rod 2 and the guide rod 5. The two-point contact detection head 10 is located below the fixed block 4. The moving block 6 is equipped with the linear bearing 13, the tail sleeve 7, and the pull rod 9. The single-point contact detection head 11 is located below the moving block 6. The probe of the dial indicator 1 passes through the measuring rod 2 and is in close contact with the end of the pull rod 9. The spring 3 is located between the dial indicator 1 and the pull rod 9 and is located inside the measuring rod 2. The pull rod 9 is fixed to the moving block 6 and the tail sleeve 7 with a fixing nut 8. The single-point detection head is connected to the moving block 6. The pull rod 9 and the measuring rod 2 are limited. The two-point contact detection head 10 and the single-point contact detection head 11 are kept in the same plane by the guide rod 5 and the linear bearing 13. During measurement, place the two standard measuring balls 12 on the left at the beginning and end points of a lead raceway, respectively. At this time, the standard measuring ball 12 on the right is located at the halfway point of this raceway. These three standard measuring balls 12 form an isosceles triangle. Place this triangle inside the standard ring gauge and adjust it to find the maximum rotation point. Rotate the dial indicator 1 until the pointer is at "0", then place the measuring instrument in a non-working state. Next, place the measuring end of the measuring instrument inside the nut, putting the measuring instrument into working mode, and find the maximum rotation point. Read the deviation of the measured dimension from the value of the dial indicator 1. The change in this measured dimension is in the same direction as the pointer change. From the measured deviation value and the pitch diameter of the standard ring gauge, the actual pitch diameter of the nut can be obtained. This measuring instrument is simple to operate, accurate, small in size, lightweight, and fast in measurement.

[0043] The above description is merely a preferred embodiment of the present utility model and does not constitute any limitation on the present utility model. Any simple modifications, alterations, or equivalent structural changes made to the above embodiments based on the technical essence of the present utility model shall still fall within the protection scope of the present utility model.

Claims

1. A three-point contact measuring tool for detecting the mean diameter of a nut, characterized in that, It includes a dial indicator, a fixed part, and a moving part; the dial indicator is mounted on the fixed part, the fixed part has a guide unit, the moving part is mounted on the guide unit, and the moving part can move linearly along the guide unit; The moving part has a transmission unit, which is supported on the measuring head of the dial indicator; The fixed part has a two-point contact detection head, and the moving part has a single-point contact detection head; The two-point contact detection head and the single-point contact detection head are arranged opposite to each other; Two standard measuring balls are detachably mounted on the two-point contact detection head, and the positions of the two standard measuring balls on the two-point contact detection head are adjustable. A single standard measuring ball is detachably mounted on the single-point contact detection head, and the position of the standard measuring ball on the single contact detection head is adjustable. When the moving part moves linearly along the guide unit, the distance between the single-point contact detection head and the two-point contact detection head changes, and the support of the micrometer measuring head by the transmission unit moves.

2. The three-point contact measuring tool for detecting the mean diameter of a nut according to claim 1, characterized in that, Two of the standard measuring balls are magnetically attached to a two-point contact detection head, and one of the standard measuring balls is magnetically attached to a single-point contact detection head.

3. The three-point contact measuring tool for detecting the mean diameter of a nut according to claim 1, characterized in that, The fixing part includes a measuring rod, a spring, and a fixing block; the guiding unit includes a guide rod. The dial indicator is installed at the left end of the measuring rod, and the measuring head of the dial indicator is inserted into the measuring space inside the measuring rod. The left end of the transmission unit is inserted into the measuring space inside the measuring rod from the right end of the measuring rod, and is supported on the test head of the dial indicator. The spring is installed in the measuring space, with its two ends supported by the inner wall of the measuring space and the end of the conducting unit, respectively. The fixing block is installed at the right end of the measuring rod and is sleeved on the outside of the transmission unit; The two-point contact detection head is mounted on the fixed block, and the guide rod is mounted on the fixed block.

4. The three-point contact measuring tool for detecting the mean diameter of a nut according to claim 3, characterized in that, The guiding unit also includes a guide sleeve, which is sleeved on the outside of the transmission unit, and the left end of the guide sleeve is detachably installed on the right end of the measuring rod.

5. The three-point contact measuring tool for detecting the mean diameter of a nut according to claim 4, characterized in that, The moving part includes a moving block and a tail sleeve. The tail sleeve is installed on the right side of the moving part. The moving block is provided with a first guide hole and a second guide hole. The first guide hole is for the guide rod to pass through, and the second guide hole is for the guide sleeve to pass through; The tail sleeve and the right end of the transmission unit are installed and fixed.

6. The three-point contact measuring tool for detecting the mean diameter of a nut according to claim 5, characterized in that, The transmission unit is a pull rod.

7. The three-point contact measuring tool for detecting the mean diameter of a nut according to claim 5, characterized in that, Linear bearings are installed in both the first guide hole and the second guide hole.

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