Positioning mechanism of measuring tool

Abstract

The utility model discloses a positioning mechanism of a measuring tool, which relates to the technical field of machining, and is characterized in that the positioning mechanism comprises a sleeve, the interior of the sleeve is hollow, two ends of the sleeve are provided with two groups of telescopic abutting rods which synchronously limit telescopic movement in the sleeve, and one end, far away from the sleeve, of each telescopic abutting rod is provided with an abutting supporting plate; the inner wall of the tubular part is supported; a first movable shaft is rotationally arranged in the middle of the upper surface of the sleeve, and a bearing block used for bearing a measuring instrument is arranged at the upper end of the first movable shaft. The telescopic abutting rod capable of synchronously extending and retracting is arranged in the sleeve, and the abutting supporting plate arranged on the telescopic abutting rod abuts against the inner wall of the tubular part, so that the sleeve can be located in the center of the tubular part; and the center of the part can be quickly and accurately found by matching the first movable shaft arranged at the upper end and the bearing block, so that a measuring tool is conveniently and accurately placed, and the measuring error is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of mechanical processing, in particular to a positioning mechanism of a measuring tool. Background Art

[0002] After the fine processing of medium and large cylindrical parts and rectangular parts is completed, it is generally necessary to inspect the dimensional accuracy of the parts such as outer diameter, inner diameter or length, width, etc., especially for the inspection of inner and outer diameter dimensional tolerances and length and width dimensional tolerances of batch finished parts. The use of precision measuring tools such as medium and large inner and outer diameter micrometers is time-consuming and labor-intensive, inefficient, and will also increase the cost of enterprises to purchase various measuring tools. Therefore, it is necessary to provide a special tolerance measurement tool. This tool consists of a rod body, a micrometer that slides freely on its upper end, and a structure for the micrometer to cooperate with the measurement. However, when this measuring tool measures tubular parts, its rod body needs to pass through the center of the part, and conventional workers cannot quickly find the center position of the part, which will lead to certain errors in the measurement results.

[0003] In view of this, a design or technical improvement is now proposed to solve the above problems.

[0004] The above content is only used to assist in understanding the technical solution of the present invention and does not constitute an admission that the above content is the closest prior art. Utility Model Content

[0005] The purpose of the utility model is to solve the above-mentioned deficiencies and provide a positioning mechanism for a measuring tool.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0007] A positioning mechanism for a measuring tool includes a sleeve, the interior of the sleeve is hollow, and two groups of telescopic rods are provided at both ends for synchronously limiting telescopic movement therein. A support plate is provided at the end of the telescopic rod away from the sleeve for supporting the inner wall of a tubular part; a first movable shaft is rotatably provided at the middle position of the upper surface of the sleeve, and a supporting block for supporting the measuring instrument is provided at the upper end of the first movable shaft.

[0008] Furthermore, two groups of upper and lower parallel rear connecting plates are provided at one end of the two groups of telescopic push rods located in the sleeve, and tooth surfaces are provided on the opposite sides of the two groups of rear connecting plates. A transmission gear is rotatably provided in the sleeve and engages with the telescopic push rods on the upper and lower groups of rear connecting plates respectively.

[0009] Furthermore, folding plates are provided on opposite sides of the ends of the two groups of rear connecting plates that are away from each other, and limiting baffles are provided on the inner wall of the sleeve and located on both sides of the transmission gear; the two groups of limiting baffles correspond to the two groups of folding plates respectively, and are used to limit the movement of the folding plates.

[0010] Furthermore, the transmission gear is rotatably connected to the sleeve via a second movable shaft, and one end of the second movable shaft movably passes through the side wall of the sleeve. A self-locking component for rotationally locking the sleeve and the second movable shaft is provided between the sleeve and the second movable shaft.

[0011] Furthermore, the self-locking assembly includes a movable sleeve that is sleeved on the second movable shaft and rotates synchronously with the second movable shaft, a ratchet arranged at one end of the movable sleeve close to the second movable shaft, a pawl that is rotatably arranged on the sleeve and cooperates with the ratchet, and a torsion spring arranged between the sleeve and the pawl.

[0012] Furthermore, a limiting sliding groove is provided on the second movable shaft, and a limiting sliding plate is provided in the movable sleeve and slides within the limiting sliding groove.

[0013] Furthermore, the sleeve is provided with a limiting plate located above the pawl for limiting its rotation.

[0014] Furthermore, the side of the support plate away from the telescopic support rod is arc-shaped, and a rubber pad is provided on the arc-shaped surface.

[0015] Furthermore, a V-shaped groove is provided on the supporting block.

[0016] Compared with the prior art, the beneficial effect of this solution is: the utility model provides a telescopic push rod that can be synchronously telescoped and moved in the sleeve, and uses the support plate provided on the telescopic push rod to press against the inner wall of the tubular part, so that the sleeve can be located in the center of the tubular part, and then cooperates with the first movable shaft and the support block provided at its upper end to quickly find the center of the part, facilitate the precise placement of the measuring tool, and reduce measurement errors. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings constituting part of this application are provided to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are provided to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0018] Figure 1 This is a frontal perspective schematic diagram of the present utility model;

[0019] Figure 2 This is a schematic diagram of the use state of the utility model;

[0020] Figure 3 This is a schematic diagram of the internal structure of the sleeve in the present utility model;

[0021] Figure 4 It is a cross-sectional schematic diagram of the utility model;

[0022] Figure 5 It is a partial enlarged schematic diagram of the position of the movable sleeve in the utility model;

[0023] Figure 6 This is a disassembly diagram of the second movable shaft and the movable sleeve in the present utility model;

[0024] Figure 7 It is a structural diagram of the movable sleeve in the utility model.

[0025] In the figure: 1. Sleeve; 11. Telescopic support rod; 12. Support plate; 13. First movable shaft; 14. Support block; 2. Rear connecting plate; 21. Tooth surface; 22. Transmission gear; 3. Folding plate; 31. Limit baffle; 4. Second movable shaft; 5. Movable sleeve; 51. Ratchet; 52. Pawl; 53. Torsion spring; 6. Limit slide; 61. Limit slide plate; 7. Limit plate; 8. Rubber pad; 9. V-groove. DETAILED DESCRIPTION

[0026] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. In the absence of conflict, the embodiments in this application and the features in the embodiments can be combined with each other. 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.

[0027] like Figure 1-7The positioning mechanism of a measuring tool shown in the figure includes a sleeve 1. The interior of the sleeve 1 is hollow, and two sets of telescopic push rods 11 are provided at both ends for synchronous limiting telescopic movement therein. A support plate 12 is provided at the end of the telescopic push rod 11 away from the sleeve 1 for supporting the inner wall of the tubular part; a first movable shaft 13 is rotatably provided at the middle position of the upper surface of the sleeve 1, and a support block 14 for supporting the measuring instrument is provided at the upper end of the first movable shaft 13. Since it is inconvenient to use a large micrometer tool when measuring the tolerance of medium and large tubular parts, it is necessary to provide a special measuring tool. The tool mainly consists of a rod body, a micrometer that slides and adjusts on the rod body, and a structure that cooperates with the micrometer measurement. It can expand the measuring scale of the micrometer, thereby facilitating Tolerance measurement of medium and large parts can be achieved. However, since the rod part of the tool needs to pass through the center position of the tubular part during measurement to actually measure the diameter size, there will be a large error when manually finding the center of the part with the naked eye. Therefore, this solution provides a positioning mechanism, which uses the telescopic support rod 11 that is synchronously telescopic and movable in the sleeve 1 to synchronously extend and retract to both ends, and then cooperates with the support plate 12 to be fixed on the inner wall of the tubular part, so that the support block 14 at its upper end will be located in the center position of the part. At this time, placing the rod body on the support block 14 will make it completely located in the center position of the part, providing a convenient and accurate positioning effect for the measurement work, and the first movable axis 13 can enable the tool to be easily rotated to measure the whole body of the part.

[0028] In one embodiment, two groups of telescopic push rods 11 are located at one end of the sleeve 1 and are provided with two groups of rear connecting plates 2 parallel to each other. Tooth surfaces 21 are provided on opposite sides of the two groups of rear connecting plates 2. A transmission gear 22 is rotatably provided in the sleeve 1 and is respectively engaged with the telescopic push rods 11 on the upper and lower groups of rear connecting plates 2. When one group of telescopic push rods 11 is telescoped, the rear connecting plate 2 at its rear end is synchronously telescoped, and then the transmission gear 22 is driven to rotate through the tooth surface 21. The transmission gear 22 is transmitted to the other group of rear connecting plates 2, so that the other group of telescopic push rods 11 is synchronously extended, thereby achieving the effect of synchronous telescopic movement.

[0029] In one embodiment, folding plates 3 are provided on opposite sides of the ends of the two groups of rear connecting plates 2 that are away from each other, and limiting baffles 31 are provided on the inner wall of the sleeve 1 and located on both sides of the transmission gear 22; the two groups of limiting baffles 31 correspond to the two groups of folding plates 3 respectively, and are used to limit the movement of the folding plates 3. In order to prevent the telescopic push rod 11 from completely extending out of the sleeve 1, the folding plates 3 and the limiting baffles 31 are provided, so that when the telescopic push rod 11 extends a certain distance from the sleeve 1, the folding plate 3 at its rear end will abut against the limiting baffle 31, thereby preventing the telescopic push rod 11 from continuing to move, and at the same time preventing it from detaching from the sleeve 1, and also preventing the folding plate 3 from abutting against the transmission gear 22 and causing interference.

[0030] In one embodiment, the transmission gear 22 is rotatably connected to the sleeve 1 through the second movable shaft 4, and one end of the second movable shaft 4 is movably passed through the side wall of the sleeve 1. A self-locking component for locking its rotation is provided between the sleeve 1 and the second movable shaft 4. The self-locking component includes a movable sleeve 5 which is sleeved on the second movable shaft 4 and rotates synchronously with the second movable shaft 4, a ratchet 51 which is provided on the movable sleeve 5 near one end of the second movable shaft 4, a pawl 52 which is rotatably provided on the sleeve 1 and cooperates with the ratchet 51, and a torsion spring 53 which is provided between the sleeve 1 and the pawl 52. When the telescopic push rod 11 is performing telescopic movement, the transmission gear 22 will be driven to rotate, thereby causing the second movable shaft 4 to rotate, and the movable sleeve 5 and the ratchet 51 at its upper end will rotate synchronously with the second movable shaft 4. Through the setting of the pawl 52, the ratchet 51 can only rotate in one direction, so that the telescopic push rod 11 will not automatically retract after being extended, so that it can achieve a fixing effect on the inner wall of the tubular part.

[0031] In one embodiment, a limiting groove 6 is provided on the second movable shaft 4, and a limiting slide 61 is provided in the movable sleeve 5, which slides in a limited position in the limiting groove 6. Through the setting of the limiting groove 6 and the limiting slide 61, the movable sleeve 5 can slide back and forth relative to the second movable shaft 4 while ensuring synchronous rotation with the second movable shaft 4, and then the ratchet 51 and the pawl 52 can be disengaged by sliding the movable sleeve 5, so that the rotation of the transmission gear 22 can be unlocked and released, so that the positioning mechanism can be removed from the tubular part.

[0032] In one embodiment, a limiting plate 7 is provided on the sleeve 1 and is located above the pawl 52 for limiting its rotation. Through the setting of the torsion spring 53, it itself has a certain limiting effect on the pawl 52, and the setting of the limiting plate 7 can further limit the pawl 52 so that it will not rotate upward at all, thereby ensuring the stability of the self-locking assembly.

[0033] In one embodiment, the side of the support plate 12 away from the telescopic support rod 11 is arc-shaped, and a rubber pad 8 is provided on the arc-shaped surface. The arc-shaped surface enables the support plate 12 to better fit the inner wall of the tubular part, and the setting of the rubber pad 8 ensures that there is a certain friction between the part and the support plate 12 can be tightly pressed against the inner wall of the part through the gradual extension of the telescopic support rod 11.

[0034] In one embodiment, a V-shaped groove 9 is provided on the supporting block 14 . The V-shaped groove 9 can adapt to rods of different specifications and facilitates the placement of the rod in the center of the supporting block 14 .

[0035] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the present invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations that come within the meaning and range of equivalents of the claims be embraced within the present invention.

Claims

1. A positioning mechanism for a measuring tool, characterized in that: The invention comprises a sleeve (1), the interior of the sleeve (1) is hollow, and two sets of telescopic supporting rods (11) are provided at both ends thereof for synchronously limiting telescopic movement therein, and a supporting plate (12) is provided at one end of the telescopic supporting rod (11) away from the sleeve (1) for supporting the inner wall of the tubular part; A first movable shaft (13) is rotatably provided at the middle position of the upper surface of the sleeve (1), and a supporting block (14) for supporting a measuring instrument is provided at the upper end of the first movable shaft (13).

2. The positioning mechanism of the measuring tool according to claim 1, characterized in that: Two sets of upper and lower parallel rear connecting plates (2) are provided at one end of the two sets of telescopic push rods (11) located in the sleeve (1), tooth surfaces (21) are provided on opposite sides of the two sets of rear connecting plates (2), and a transmission gear (22) is rotatably provided in the sleeve (1) and is respectively engaged with the telescopic push rods (11) on the upper and lower sets of rear connecting plates (2).

3. The positioning mechanism of the measuring tool according to claim 2, characterized in that: Folding plates (3) are provided on opposite sides of the ends of the two groups of rear connecting plates (2) that are away from each other, and limiting baffles (31) are provided on the inner wall of the sleeve (1) and are located on both sides of the transmission gear (22); The two groups of limiting baffles (31) correspond to the two groups of folding plates (3) respectively, and are used for limiting the movement of the folding plates (3).

4. The positioning mechanism of the measuring tool according to claim 3, characterized in that: The transmission gear (22) is rotatably connected to the sleeve (1) via a second movable shaft (4), and one end of the second movable shaft (4) movably passes through the side wall of the sleeve (1). A self-locking component for rotationally locking the sleeve (1) and the second movable shaft (4) is provided between the sleeve (1) and the second movable shaft (4).

5. The positioning mechanism of the measuring tool according to claim 4, characterized in that: The self-locking assembly comprises a movable sleeve (5) sleeved on the second movable shaft (4) and rotating synchronously with the second movable shaft (4), a ratchet (51) arranged on one end of the movable sleeve (5) close to the second movable shaft (4), a pawl (52) rotatably arranged on the sleeve (1) and cooperating with the ratchet (51), and a torsion spring (53) arranged between the sleeve (1) and the pawl (52).

6. The positioning mechanism of the measuring tool according to claim 5, characterized in that: A limiting sliding groove (6) is provided on the second movable shaft (4), and a limiting slide plate (61) is provided in the movable sleeve (5) and is configured to slide within the limiting sliding groove (6) in a limited manner.

7. The positioning mechanism of the measuring tool according to claim 6, characterized in that: The sleeve (1) is provided with a limiting plate (7) located above the ratchet (52) for limiting its rotation.

8. The positioning mechanism of the measuring tool according to any one of claims 1 to 7, characterized in that: The side of the support plate (12) away from the telescopic support rod (11) is arc-shaped, and a rubber pad (8) is provided on the arc-shaped surface.

9. The positioning mechanism of the measuring tool according to claim 8, characterized in that: The supporting block (14) is provided with a V-shaped groove (9).

Images