Detection tool for measuring diameter of inner groove

Abstract

The utility model discloses a testing fixture for measuring the diameter of an inner groove, which comprises a dial indicator, and the dial indicator comprises a dial plate and a telescopic detection rod. A plurality of measuring claws are arranged on the measuring column; the transmission rod is slidably connected with the measuring column, and the plurality of measuring claws can be unfolded or retracted to drive the transmission rod to slide relative to the measuring column; one end of the rotatable linkage rod can abut against the detection rod, and the other end of the rotatable linkage rod can abut against the transmission rod. According to the utility model, through the arrangement of the linkage assembly, the vertical movement of the transmission rod is converted into the rotation of the linkage rod, and then the rotation of the linkage rod is converted into the movement of the detection rod in the vertical direction, so that the movement direction of the transmission rod is opposite to the movement direction of the detection rod; and finally, the dial plate of the dial gauge and the measuring column in the measuring assembly are fixed on the mounting plate, so that the original handheld detection is replaced, the measuring column is prevented from shaking in the measuring process, and the measuring stability and precision are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of measuring tools, in particular to a measuring tool for measuring the diameter of an inner groove. Background Art

[0002] For some workpieces, it is necessary to drill holes and open annular grooves in the holes during manufacturing. After production, the inner groove diameter of the holes needs to be measured in order to select qualified workpieces.

[0003] However, the existing gauge has a measuring part and a display part that are directly connected and in the same direction. It is necessary to insert the measuring part into the hole and read the value of the display part through a handheld gauge to obtain the size of the inner groove diameter. During the inspection process of the handheld gauge, the measuring part is prone to shaking relative to the workpiece, resulting in large changes in the displayed value, inaccurate readings, and low measurement accuracy. Summary of the invention

[0004] In view of the above-mentioned deficiencies in the prior art, the technical problem to be solved by the present invention is to provide a gauge for measuring the inner groove diameter, so as to solve the problem of low measurement accuracy of the handheld gauge in the prior art.

[0005] The utility model solves the technical problem by adopting a technical solution that is a gauge for measuring the inner groove diameter, comprising a dial gauge, the dial gauge comprising a dial and a retractable detection rod, and further comprising:

[0006] A mounting plate, wherein the micrometer is arranged on the mounting plate and is located above the mounting plate;

[0007] A measuring assembly is arranged on the mounting plate, and comprises: a measuring column, the measuring column is located on the side of the dial, a plurality of measuring claws are arranged on the measuring column, and the plurality of measuring claws can be expanded or retracted to abut against or separate from the inner groove wall of the workpiece; a transmission rod, the transmission rod is slidably connected to the measuring column, and the expansion or retraction of the plurality of measuring claws can drive the transmission rod to slide relative to the measuring column;

[0008] A linkage assembly is arranged on the mounting plate, and the linkage assembly includes: a linkage rod, the linkage rod having a first abutting portion, a second abutting portion and a rotating portion, the rotating portion is located between the first abutting portion and the second abutting portion, the linkage rod can rotate around the rotating portion, the first abutting portion can abut or separate from one end of the transmission rod, and the second abutting portion can abut or separate from one end of the detection rod.

[0009] Furthermore, three measuring claws are evenly distributed on the circumference of the measuring column.

[0010] Furthermore, the transmission rod can slide in a direction toward the linkage rod to drive the plurality of measuring claws to contract.

[0011] Furthermore, a preload spring is provided between the measuring column and the transmission rod, and the preload spring is used to enable the transmission rod to slide toward the linkage rod.

[0012] Furthermore, a third abutment portion is further provided on the linkage rod, and the third abutment portion is located on a side of the first abutment portion away from the rotating portion;

[0013] A pressing rod is also provided, and the pressing rod can move along its axial direction to abut against the third abutting portion and drive the linkage rod to rotate around the rotating portion.

[0014] Furthermore, it also includes a box body, the mounting plate is fixedly connected to the upper end of the box body, and the linkage assembly is arranged in the box body;

[0015] The linkage rod and the detection rod are both passed through the mounting plate of the box body and can slide relative to the mounting plate. The dial of the micrometer and the measuring column are both located outside the box body.

[0016] Furthermore, the pressing rod includes a pressing portion and a linkage section fixed to each other, the pressing portion is located outside the box body, the linkage section passes through the mounting plate, and one end of the linkage section away from the pressing portion abuts against the third abutting portion.

[0017] Furthermore, a rubber column is provided at one end of the measuring column away from the transmission rod.

[0018] Furthermore, a positioning plate is provided on the measuring column, and the positioning plate has a positioning surface that can fit with the end surface of the workpiece.

[0019] Compared with the prior art, the utility model has at least the following beneficial effects:

[0020] (1) By setting a linkage assembly, the vertical movement of the transmission rod is converted into the rotation of the linkage rod, and then the rotation of the linkage rod is converted into the vertical movement of the detection rod, so that the movement direction of the transmission rod is opposite to the movement direction of the detection rod, and finally the dial of the micrometer and the measuring column in the measuring assembly are fixed on the mounting plate to replace the original handheld detection, so as to avoid the shaking of the measuring column during the measurement process and improve the stability and accuracy of the measurement. While fixing the dial and the measuring column, the dial and the measuring column are placed on the same side of the mounting plate, so as to facilitate reading the value of the dial at any time during the measurement process and improve the efficiency of batch measurement.

[0021] (2) Three measuring jaws are arranged on the measuring column. When the three measuring jaws contact the inner wall of the groove at the same time, the three measuring jaws only need to be opened at the same distance at the same time to ensure that the measured value is the actual diameter of the groove. In this way, the measurement accuracy is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of the inspection tool in the embodiment;

[0023] Figure 2 This is a schematic diagram of the structure of the inspection tool after the box body is removed in the embodiment;

[0024] Figure 3 It is a schematic diagram of the structure of the measuring component and the linkage component in the embodiment;

[0025] In the figure:

[0026] 100, measuring assembly; 110, positioning plate; 120, measuring column; 130, measuring claw; 140, rubber column;

[0027] 200, micrometer; 210, dial; 220, probe rod;

[0028] 300, mounting plate;

[0029] 400, box body;

[0030] 500, pressing rod; 510, pressing part; 520, linkage section;

[0031] 600, linkage assembly; 610, linkage rod. DETAILED DESCRIPTION

[0032] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0033] Please refer to Figure 1-Figure 3 The utility model discloses a gauge for measuring the inner groove diameter, including a micrometer 200, wherein the micrometer 200 includes a dial 210 and a retractable detection rod 220, and further includes:

[0034] A mounting plate 300, wherein the micrometer 200 is disposed on the mounting plate 300 and is located above the mounting plate 300;

[0035] The measuring assembly 100 is arranged on the mounting plate 300, and comprises: a measuring column 120, the measuring column 120 is located at the side of the dial 210, and a plurality of measuring claws 130 are arranged on the measuring column 120, and the plurality of measuring claws 130 can be expanded or contracted to abut against or separate from the inner groove wall of the workpiece; a transmission rod, the transmission rod is slidably connected to the measuring column 120, and the expansion or contraction of the plurality of measuring claws 130 can drive the transmission rod to slide relative to the measuring column 120;

[0036] The linkage assembly 600 is arranged on the mounting plate 300, and the linkage assembly 600 includes: a linkage rod 610, the linkage rod 610 having a first abutting portion, a second abutting portion and a rotating portion, the rotating portion is located between the first abutting portion and the second abutting portion, the linkage rod 610 can rotate around the rotating portion, the first abutting portion can abut or separate from one end of the transmission rod, and the second abutting portion can abut or separate from one end of the detection rod 220.

[0037] The present application converts the vertical movement of the transmission rod into the rotation of the linkage rod 610 by setting a linkage assembly 600, and then converts the rotation of the linkage rod 610 into the vertical movement of the detection rod 220, so that the movement direction of the transmission rod is opposite to the movement direction of the detection rod 220, and finally fixes the dial 210 of the micrometer 200 and the measuring column 120 in the measuring assembly 100 on the mounting plate 300 to replace the original handheld detection, avoid the shaking of the measuring column 120 during the measurement process, and improve the stability and accuracy of the measurement. While fixing the dial 210 and the measuring column 120, the dial 210 and the measuring column 120 are placed on the same side of the mounting plate 300, so that the value of the dial 210 can be read at any time during the measurement process, thereby improving the efficiency of batch measurement.

[0038] Specifically, align the hole of the workpiece with the measuring column 120, and gradually press the workpiece downward so that the measuring column 120 extends into the hole of the workpiece, and the multiple measuring claws 130 abut against the inner wall of the hole; as the measuring column 120 continues to extend into the hole until the multiple measuring claws 130 are in the groove in the hole and abut against the inner wall of the groove, read the reading of the dial 210 at this time, which is the diameter of the inner groove.

[0039] When the measuring claws 130 extend into the groove, the multiple measuring claws 130 unfold and drive the transmission rod to move downward. The transmission rod presses against the first abutment portion downward and drives the linkage rod 610 to rotate around the rotating portion. During the rotation of the linkage rod 610, the second abutment portion presses against the detection rod 220 upward and drives the detection rod 220 to move upward, thereby changing the value of the dial 210.

[0040] It should be noted that how the expansion or contraction of the measuring claw 130 drives the transmission rod to move vertically, and how the vertical movement of the detection rod 220 changes the reading of the dial 210 are both prior arts and will not be described in detail here.

[0041] Furthermore, three measuring claws 130 are evenly distributed around the measuring column 120 .

[0042] It should be noted that the existing gauges only have two measuring jaws 130 . During the measurement process, it cannot be ensured that the positions measured by the two measuring jaws 130 are exactly at the maximum distance of the groove. The measurement result may be smaller than the actual diameter, resulting in measurement errors.

[0043] Based on this, the present application sets three measuring jaws 130 on the measuring column 120. When the three measuring jaws 130 contact the inner wall of the groove at the same time, it is only necessary to open the three measuring jaws 130 at the same distance to ensure that the measured value is the actual diameter of the groove, thereby improving the measurement accuracy.

[0044] Furthermore, the transmission rod can slide in a direction toward the linkage rod 610 to drive the plurality of measuring jaws 130 to retract.

[0045] Furthermore, a preload spring is provided between the measuring column 120 and the transmission rod, and the preload spring is used to enable the transmission rod to slide toward the linkage rod 610 .

[0046] Specifically, a preload spring is provided, which can enable the plurality of measuring claws 130 to expand in the hole until they abut against the inner wall of the hole or the inner wall of the groove, and can also enable the transmission rod to have a tendency to move downward so that the transmission rod always abuts against the linkage rod 610 .

[0047] Furthermore, a third abutment portion is further provided on the linkage rod 610, and the third abutment portion is located at a side of the first abutment portion away from the rotating portion;

[0048] A pressing rod 500 is also provided. The pressing rod 500 can move along its axial direction to abut against the third abutting portion and drive the linkage rod 610 to rotate around the rotating portion.

[0049] Specifically, a pressing rod 500 is provided. Before measurement, the pressing rod 500 can be pressed downward to make the pressing rod 500 press downward against the linkage rod 610 and drive the linkage rod 610 to rotate. At this time, the transmission rod moves downward under the elastic force of the preload spring and drives the multiple measuring claws 130 to contract, so that the measuring column 120 can be inserted into the hole of the workpiece. After the measuring column 120 is inserted into the hole, the pressing rod 500 can be released. At this time, the linkage rod 610 rotates to the first abutment portion under the elastic force of the detection rod 220 (the detection rod 220 is provided with a spring to ensure automatic reset after extension and retraction. Of course, a torsion spring can also be provided at the rotating part to provide elastic force to reset the linkage rod 610) and abuts against the transmission rod again.

[0050] Furthermore, it also includes a box body 400, the mounting plate 300 is fixedly connected to the upper end of the box body 400, and the linkage assembly 600 is arranged in the box body 400;

[0051] The linkage rod 610 and the detection rod 220 are both disposed through the mounting plate 300 of the box body 400 and can slide relative to the mounting plate 300 . The dial 210 of the micrometer 200 and the measuring column 120 are both located outside the box body 400 .

[0052] Specifically, the box body 400 is provided to hide the linkage assembly 600 inside the box body 400, which not only protects the linkage assembly 600, but also enables the measuring column 120 and the dial 210 to be at the height when the operator's hand is bent, so that the operator can insert the workpiece into the measuring column 120 and read the value of the dial 210.

[0053] Furthermore, the pressing rod 500 includes a pressing portion 510 and a linkage section 520 fixed to each other, the pressing portion 510 is located outside the box body 400, the linkage section 520 is passed through the mounting plate 300, and one end of the linkage section 520 away from the pressing portion 510 abuts against the third abutting portion.

[0054] Furthermore, a rubber column 140 is provided at one end of the measuring column 120 away from the transmission rod.

[0055] Specifically, the rubber column 140 is provided to prevent the top end of the measuring column 120 from hitting the end surface of the hole and damaging the workpiece and the measuring column 120, thereby playing a protective and buffering role.

[0056] Furthermore, a positioning plate 110 is provided on the measuring column 120 , and the positioning plate 110 has a positioning surface that can be fitted with the end surface of the workpiece.

[0057] Specifically, the workpiece is gradually inserted into the measuring column 120 until the end surface of the workpiece abuts against the positioning plate 110 and fits with the positioning surface, so as to position the workpiece, avoid the workpiece from tilting or shaking left and right, and improve the measurement accuracy.

[0058] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back...) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0059] In addition, in the present invention, the descriptions of "first", "second", "one", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0060] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0061] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

Claims

1. A gauge for measuring the diameter of an inner groove, comprising a micrometer, the micrometer comprising a dial and a retractable detection rod, characterized in that: Also includes: A mounting plate, the micrometer is arranged on the mounting plate, and the dial is located above the mounting plate; A measuring assembly is arranged on the mounting plate, and comprises: a measuring column, the measuring column is located on the side of the dial, a plurality of measuring claws are arranged on the measuring column, and the plurality of measuring claws can be expanded or retracted to abut against or separate from the inner groove wall of the workpiece; a transmission rod, the transmission rod is slidably connected to the measuring column, and the expansion or retraction of the plurality of measuring claws can drive the transmission rod to slide relative to the measuring column; A linkage assembly is arranged on the mounting plate, and the linkage assembly includes: a linkage rod, the linkage rod having a first abutting portion, a second abutting portion and a rotating portion, the rotating portion is located between the first abutting portion and the second abutting portion, the linkage rod can rotate around the rotating portion, the first abutting portion can abut or separate from one end of the transmission rod, and the second abutting portion can abut or separate from one end of the detection rod.

2. A gauge for measuring inner groove diameter according to claim 1, characterized in that: Three measuring claws are evenly distributed on the circumference of the measuring column.

3. A gauge for measuring inner groove diameter according to claim 1, characterized in that: The transmission rod can slide along a direction toward the linkage rod to drive the plurality of measuring claws to contract.

4. A gauge for measuring inner groove diameter according to claim 3, characterized in that: A preload spring is also provided between the measuring column and the transmission rod, and the preload spring is used to enable the transmission rod to slide toward the linkage rod.

5. A gauge for measuring inner groove diameter according to claim 1, characterized in that: The linkage rod is further provided with a third abutment portion, and the third abutment portion is located at a side of the first abutment portion away from the rotating portion; A pressing rod is also provided, and the pressing rod can move along its axial direction to abut against the third abutting portion and drive the linkage rod to rotate around the rotating portion.

6. A gauge for measuring inner groove diameter according to claim 5, characterized in that: It also includes a box body, the mounting plate is fixedly connected to the upper end of the box body, and the linkage assembly is arranged in the box body; The linkage rod and the detection rod are both passed through the mounting plate of the box body and can slide relative to the mounting plate. The dial of the micrometer and the measuring column are both located outside the box body.

7. A gauge for measuring inner groove diameter according to claim 6, characterized in that: The pressing rod includes a pressing portion and a linkage section fixed to each other, the pressing portion is located outside the box body, the linkage section passes through the mounting plate, and one end of the linkage section away from the pressing portion abuts against the third abutting portion.

8. A gauge for measuring inner groove diameter according to claim 1, characterized in that: A rubber column is also provided at one end of the measuring column away from the transmission rod.

9. A gauge for measuring inner groove diameter according to claim 1, characterized in that: A positioning plate is also arranged on the measuring column, and the positioning plate has a positioning surface that can be fitted with the end surface of the workpiece.

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