Floating contact type inner hole measuring structure for automatic measurement

Abstract

The utility model discloses a floating contact type inner hole measuring structure used in automatic measurement, which relates to the technical field of precision measurement and comprises a base, the lower end of the base is fixedly connected with an outer ring, the bottom end of the inner side of the outer ring is fixedly connected with four evenly-distributed rotation stopping pins, the inner side of the base is slidably connected with a push block, and the push block is connected with the outer ring. A limiting ring is fixedly connected to the outer surface of the push block, two retainers are movably connected to the position, located at the lower end of the push block, of the inner side of the outer ring, a floating block is movably connected between the two retainers, three evenly-distributed first floating grooves are formed in the lower end of the push block, and three evenly-distributed limiting rods are fixedly connected to the upper end of the floating block; according to the utility model, through the cooperation of the floating block, the retainer and the spring and the limitation of the rotation stopping pin, the automatic centering function of the measuring head is realized, and the measuring head enters a hole for measurement in a floating state, so that the possible scratch to the inner hole of a workpiece caused by rigid connection can be avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to precision measurement technical field, concretely relates to a floating contact type inner hole measuring structure for automation measurement. BACKGROUND

[0002] In the industrial production process such as mechanical manufacturing, automobile parts processing, the inner hole size and shape precision of various parts directly affect the quality and performance of products, and therefore the detection of part inner hole is one of the key indicators for measuring workpiece quality.

[0003] When the traditional measuring structure contacts the inner hole, it is difficult to adapt to the slight deviation of the inner hole, and when the position of the measuring head inserted into the measured hole has certain error, it is easy to produce friction with the inner wall of the inner hole, thereby scratching the surface of the workpiece, which not only affects the product quality, but also increases the production cost and the scrap rate, therefore, a floating contact type inner hole measuring structure for automation measurement is proposed to solve the above problems. SUMMARY

[0004] To solve the above technical problems, a floating contact type inner hole measuring structure for automation measurement is provided, which solves the problem that the traditional measuring structure in the background technology is difficult to adapt to the slight deviation of the inner hole when contacting the inner hole, and when the position of the measuring head inserted into the measured hole has certain error, it is easy to produce friction with the inner wall of the inner hole, thereby scratching the surface of the workpiece, which not only affects the product quality, but also increases the production cost and the scrap rate.

[0005] To achieve the above purposes, the technical scheme adopted by the utility model is as follows:

[0006] A floating contact type inner hole measuring structure for automation measurement, including the base, the lower end of the base is fixedly connected with the outer ring, the inner side of the outer ring is fixedly connected with four evenly distributed rotation stop pins, the inner side of the base is slidably connected with the push block, the outer surface of the push block is fixedly connected with the limiting ring, the inner side of the outer ring is movably connected with two holding frames at the lower end of the push block, two holding frames are movably connected with the floating block, the lower end of the push block is provided with three evenly distributed first floating grooves, the upper end of the floating block is fixedly connected with three evenly distributed limiting rods, the outer surfaces of the floating block and the holding frame are provided with four evenly distributed second floating grooves, the upper holding frame and the limiting ring and the floating block and the lower holding frame and the floating block are fixedly connected with springs, the lower end of the floating block is fixedly connected with the connecting seat, the lower end of the connecting seat is fixedly connected with the connecting handle through bolts, the inner side of the connecting seat is fixedly connected with the push rod, the lower end of the push rod is provided with the pneumatic telescopic part, the lower end of the pneumatic telescopic part is fixedly connected with the thimble, the inner side of the connecting handle is fixedly connected with the measuring head, the inner side of the measuring head is fixedly connected with the elastic push part, the thimble is slidably connected in the elastic push part, the outer surface of the elastic push part is fixedly connected with two symmetrically distributed measuring needles, the outer surface of the base is fixedly connected with the air inlet pipe, the air inlet pipe is communicated with the inside of the base.

[0007] Preferably, the limiting rod is inserted into the first floating groove, and the size of the limiting rod is smaller than the size of the first floating groove.

[0008] Preferably, the outer surface of the measuring head is provided with two symmetrically distributed guide grooves, and the measuring needle is slidably connected in the guide groove.

[0009] Preferably, the outer surface of the connecting handle is provided with an air inlet hole, and the air inlet hole is communicated with the inside of the pneumatic telescopic part.

[0010] Preferably, the lower end of the elastic push part is provided with a through groove, and the diameter of the through groove is smaller than the diameter of the thimble.

[0011] Compared with the prior art, the utility model has the beneficial effects that:

[0012] The utility model discloses a kind of floating contact type inner hole measuring structures for automation measurement, by the cooperation of floating block and holding frame and spring, and the restriction of rotation stop pin, the automatic centering function of measuring head is realized, and measuring head enters into hole to measure under floating state, can avoid that the scratch possibly caused by hard connection to workpiece inner hole. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 It is the structural schematic diagram of the utility model;

[0014] Figure 2 It is the sectional view of the utility model;

[0015] Figure 3 Figure is the structure diagram of the floating block in the utility model;

[0016] Figure 4 Figure is the structure diagram of the limiting rod in the utility model;

[0017] Figure 5 Figure is the structure diagram of the pneumatic measuring assembly in the utility model.

[0018] Figure mark is:

[0019] 1, base; 2, outer ring; 3, push block; 301, limiting ring; 302, first floating groove; 303, limiting rod; 4, floating block; 5, retainer; 6, rotation stop pin; 7, spring; 8, second floating groove; 9, connecting seat; 10, connecting handle; 11, push rod; 1101, pneumatic telescopic part; 12, measuring head; 13, elastic push part; 14, thimble; 15, measuring needle; 16, air inlet hole; 17, air inlet pipe; 18, pneumatic measuring assembly; 1801, pneumatic measuring head; 1802, gas source connecting head; 1803, gas nozzle; 1804, gas flow channel. DETAILED DESCRIPTION

[0020] The following description is used to disclose the utility model so that those skilled in the art can realize the utility model. The preferred embodiments in the following description are only as examples, and other obvious variants can be thought of by those skilled in the art.

[0021] Refer to Figures 1-4As shown, a floating contact hole measuring structure for automatic measurement, comprising a base 1, the lower end of the base 1 is fixedly connected with an outer ring 2, the inner bottom end of the outer ring 2 is fixedly connected with four evenly distributed rotation stop pins 6, the inner side of the base 1 is slidingly connected with a push block 3, the outer surface of the push block 3 is fixedly connected with a limiting ring 301, the inner side of the outer ring 2 is movably connected with two retaining frames 5 at the lower end of the push block 3, two retaining frames 5 are movably connected with a floating block 4, the lower end of the push block 3 is provided with three evenly distributed first floating grooves 302, the upper end of the floating block 4 is fixedly connected with three evenly distributed limiting rods 303, the outer surfaces of the floating block 4 and the retaining frame 5 are both provided with four evenly distributed second floating grooves 8, the upper retaining frame 5 and the floating block 4 are both fixedly connected with springs 7, the lower end of the floating block 4 is fixedly connected with a connecting seat 9, the lower end of the connecting seat 9 is fixedly connected with a connecting handle 10 through a bolt, the inner side of the connecting seat 9 is fixedly connected with a push rod 11, the lower end of the push rod 11 is provided with a pneumatic telescopic part 1101, the lower end of the pneumatic telescopic part 1101 is fixedly connected with a thimble 14, the inner side of the connecting handle 10 is fixedly connected with a measuring head 12, the inner side of the measuring head 12 is fixedly connected with an elastic pushing part 13, the thimble 14 is slidingly connected in the elastic pushing part 13, the outer surface of the elastic pushing part 13 is fixedly connected with two symmetrically distributed measuring needles 15, the outer surface of the base 1 is fixedly connected with an air inlet pipe 17, the air inlet pipe 17 is in communication with the inside of the base 1.

[0022] Further, the limiting rod 303 is inserted into the first floating groove 302, and the size of the limiting rod 303 is smaller than the size of the first floating groove 302.

[0023] Further, the air inlet pipe 17 is in communication with the air source, compressed gas is injected into the upper end area of the push block 3 through the air source and the air inlet pipe 17, which can push the push block 3 to move downward, when the push block 3 moves downward, each spring 7 will be gradually compressed, thereby pushing the connecting seat 9 to move downward, and then making the measuring head 12 inserted into the measured hole, because there is a certain gap between the surface of the floating block 4 and the inner wall of the outer ring 2, the floating block 4 can move horizontally in the gap, when there is a position deviation between the measuring head 12 and the measured hole, the force generated when the measuring head 12 contacts with the inner wall of the measured hole will push the floating block 4 to move, thereby adjusting the position of the measuring head 12, realizing the self-centering function, when the measuring head 12 contacts with the workpiece, the control compressed air is disconnected, the measuring head 12 enters the hole to measure in the floating state, which can avoid the scratch on the workpiece inner hole caused by hard connection.

[0024] Further, the rotation stop pin 6 is used to limit the rotation of the floating block 4, and indirectly limit the rotation of the measuring head 12, which can avoid the rotation of the measuring head 12 when it is inserted into the measured hole, and the friction with the inner wall of the measured hole, thereby causing scratch on the workpiece.

[0025] Further, the outer surface of the measuring head 12 is provided with two symmetrically distributed guide grooves, and the measuring needle 15 is slidingly connected to the inside of the guide grooves.

[0026] Further, the outer surface of the connecting handle 10 is provided with an air inlet hole 16, and the air inlet hole 16 is in communication with the inside of the pneumatic telescopic part 1101.

[0027] Further, the lower end of the elastic pushing part 13 is provided with a through groove, and the diameter of the through groove is smaller than the diameter of the ejector pin 14.

[0028] Further, the pneumatic telescopic part 1101 is made of elastic material and has a hollow cavity inside, and the outer surface is in a corrugated shape. Through the air inlet hole 16, the pneumatic telescopic part 1101 can be expanded and elongated to push the ejector pin 14 to move downward. In the initial state, the tip of the ejector pin 14 is located at the center of the through groove of the elastic pushing part 13. Since the diameter of the through groove is smaller than the diameter of the ejector pin 14, the diameter of the contact part between the ejector pin 14 and the elastic pushing part 13 increases during the downward movement of the ejector pin 14, so that the elastic pushing part 13 is opened to the both sides, thereby pushing the measuring needle 15 to move outward and contact the inner wall of the measured hole. The contact force between the measuring needle 15 and the inner wall of the measured hole will cause a slight change in current. By measuring the change and calculating, the measurement can be realized.

[0029] Further, the part below the connecting seat 9 can be replaced with a pneumatic measuring assembly 18. The pneumatic measuring assembly 18 includes a pneumatic measuring head 1801 fixedly connected to the connecting seat 9 by bolts, two symmetrically distributed gas source connectors 1802 and two symmetrically distributed gas nozzles 1803 in communication with the outer surface of the pneumatic measuring head 1801, and a gas flow channel 1804 is provided in the inside of the pneumatic measuring head 1801. The gas flow channel 1804 is in communication with the gas source connectors 1802 and the gas nozzles 1803. During measurement, gas is injected into the gas flow channel 1804 through the gas source connectors 1802 and is sprayed out through the gas nozzles 1803. By monitoring the change of gas flow through the measuring device and calculating, the measurement can be realized.

[0030] Working principle: when measuring, compressed air is injected to the upper end area of the push block 3 through the air inlet pipe 17, the compressed air pushes the push block 3 to move downwards, when the push block 3 moves downwards, the measuring head 12 moves downwards together and gradually approaches the measured hole, when the measuring head 12 approaches the measured hole, if there is a position deviation between the measuring head 12 and the measured hole, the force generated by the contact between the measuring head 12 and the hole wall pushes the floating block 4 to move horizontally in the gap between the floating block 4 and the inner wall of the outer ring 2, the position of the measuring head 12 is adjusted flexibly, the self-centering function of the measuring head 12 is realized, when the measuring head 12 contacts the workpiece, the control of compressed air is turned off, the measuring head 12 enters the hole in a floating state, which can avoid the scratch of the hard connection to the inner hole of the workpiece, then, the pneumatic telescopic part 1101 is supplied with air through the air inlet hole 16, the pneumatic telescopic part 1101 expands and elongates to push the ejector pin 14 to move downwards, since the diameter of the lower end through groove of the elastic pushing part 13 is smaller than the diameter of the ejector pin 14, the diameter of the contact part of the ejector pin 14 increases during the downward movement of the ejector pin 14, which makes the elastic pushing part 13 open to both sides, and then pushes the measuring pin 15 to move outward to contact the inner wall of the measured hole for measurement.

[0031] The basic principle, main features and advantages of the utility model are shown and described above. It should be understood by the person skilled in the art that the utility model is not limited by the above-mentioned embodiments, the above-mentioned embodiments and the description in the specification are only the principles of the utility model, various changes and improvements of the utility model can be made without departing from the spirit and scope of the utility model, and these changes and improvements all fall within the scope of the utility model claimed. The protection scope required by the utility model is defined by the appended claims and their equivalents.

Claims

1. A floating contact bore measuring structure for use in automated measurement, characterized by, The application relates to a base (1), the lower end of the base (1) is fixedly connected with an outer ring (2), the inner side of the outer ring (2) is fixedly connected with four evenly-distributed rotation-stopping pins (6), the inner side of the base (1) is slidingly connected with a push block (3), the outer surface of the push block (3) is fixedly connected with a limiting ring (301), the inner side of the outer ring (2) is movably connected with two holding frames (5) at the lower end of the push block (3), two floating blocks (4) are movably connected between the two holding frames (5), the lower end of the push block (3) is provided with three evenly-distributed first floating grooves (302), the upper end of the floating block (4) is fixedly connected with three evenly-distributed limiting rods (303), the outer surfaces of the floating block (4) and the holding frame (5) are provided with four evenly-distributed second floating grooves (8), the holding frame (5) on the upper side is fixedly connected with the limiting ring (301) and the floating block (4), and the holding frame (5) on the lower side is fixedly connected with the floating block (4), springs (7) are arranged between the holding frame (5) on the upper side and the floating block (4) and between the holding frame (5) on the lower side and the floating block (4), the lower end of the floating block (4) is fixedly connected with a connecting base (9), the lower end of the connecting base (9) is fixedly connected with a connecting handle (10) through bolts, the inner side of the connecting base (9) is fixedly connected with a push rod (11), the lower end of the push rod (11) is provided with a pneumatic telescopic part (1101), the lower end of the pneumatic telescopic part (1101) is fixedly connected with a thimble (14), the inner side of the connecting handle (10) is fixedly connected with a measuring head (12), the inner side of the measuring head (12) is fixedly connected with an elastic push part (13), the thimble (14) is slidingly connected in the elastic push part (13), the outer surface of the elastic push part (13) is fixedly connected with two symmetrically-distributed measuring needles (15), the outer surface of the base (1) is fixedly connected with an air inlet pipe (17), and the air inlet pipe (17) is in communication with the inside of the base (1).

2. A floating contact bore measuring structure for use in automated metrology according to claim 1, wherein: The limiting rod (303) is inserted into the first floating groove (302), and the size of the limiting rod (303) is smaller than that of the first floating groove (302).

3. A floating contact bore measuring structure for use in automated metrology according to claim 1, wherein: The outer surface of the measuring head (12) is provided with two symmetrically-distributed guide grooves, and the measuring needle (15) is slidingly connected in the guide groove.

4. A floating contact bore measuring structure for use in automated metrology according to claim 1, wherein: The outer surface of the connecting handle (10) is provided with an air inlet hole (16), and the air inlet hole (16) is in communication with the inside of the pneumatic telescopic part (1101).

5. A floating contact bore measuring structure for use in automated metrology according to claim 1, wherein: The lower end of the elastic push part (13) is provided with a through groove, and the diameter of the through groove is smaller than that of the thimble (14).

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