Inner diameter measuring instrument based on mechanical precision parts and measuring method

Abstract

The application discloses a mechanical precision component-based inner diameter measuring instrument and a measuring method, which comprises a mounting seat, a rotating ring sleeve is mounted on the mounting seat, two oppositely arranged fixed columns are fixedly mounted on the inner wall of the rotating ring sleeve, rotatable mounting pieces are respectively mounted on the opposite surfaces of the two fixed columns, swing rods are fixedly mounted on the opposite surfaces of the two mounting pieces, and measuring telescopic assemblies are slidably mounted on the opposite surfaces of the two swing rods. The two isosceles triangles of the upper part and the lower part are congruent triangles, that is, the distance between the fixed block and the movable block is equal to the distance of the inner diameter of the component, and the length of the measured inner diameter can be directly obtained through the scale, so that the influence of the inconvenient reading of the existing measuring mechanism is solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of mechanical precision parts, in particular to an inner diameter measuring instrument and a measuring method based on mechanical precision parts. BACKGROUND

[0002] The processing of precision parts mainly requires the size, and the method for measuring the inner diameter of precision parts generally uses an inner diameter gauge to measure the hole, supports the measuring contact measuring surface on the measured surface, adjusts the differential cylinder, makes the measuring surface on one side of the differential cylinder swing in the radial section of the hole, finds the minimum size, then tightens the fixing screw, takes out and reads the number, but for some tubular mechanical precision parts, the personnel need to use the existing tools to measure the inner diameter of different depths, and the existing tools need to read the length on the spot when recording the inner diameter, since the reading is inside the part, on the one hand, the reading is relatively difficult, on the other hand, the data is not accurate, and the part may be offset during the measurement of the inner diameter. SUMMARY

[0003] The present application aims to provide an inner diameter measuring instrument and a measuring method based on mechanical precision parts, which are based on two isosceles triangles that are congruent triangles, i.e. the distance between the fixed block and the movable block is equal to the distance of the inner diameter of the part, and the length of the measured inner diameter can be directly obtained by setting the scale, thereby solving the problem of inconvenient reading of the existing measuring mechanism.

[0004] To achieve the above-mentioned purpose, the present application provides the following technical scheme: an inner diameter measuring instrument based on mechanical precision parts, comprising a mounting seat, a rotating ring sleeve is installed on the mounting seat, two opposite fixed columns are fixedly installed on the inner wall of the rotating ring sleeve, two rotatable mounting members are respectively installed on the opposite surfaces of the two fixed columns, two swing rods are respectively fixedly installed on the opposite surfaces of the two mounting members, and two measuring telescopic assemblies are respectively slidably installed on the opposite surfaces of the two swing rods;

[0005] One of the fixed columns is provided with a connecting rod mechanism for opening or closing the two swing rods, the connecting rod mechanism comprises a third electric telescopic rod fixedly installed on the upper surface of the fixed column, a transversely arranged connecting strip is fixedly installed on the output end of the third electric telescopic rod, two connecting rods are hingedly installed on the end of the connecting strip away from the third electric telescopic rod, and the two connecting rods are respectively rotatably connected with the side walls of the corresponding swing rods.

[0006] Preferably, each measuring telescopic assembly comprises a first measuring rod and a second measuring rod, which are slidingly installed in the corresponding installation slots of the swing rod, and the opposite surfaces of the first measuring rod and the second measuring rod are provided with racks, respectively; the inside of the installation part is fixedly installed with a first motor, the output shaft of the first motor extends between the first measuring rod and the second measuring rod and is fixedly installed with a first rotating tooth, and the first rotating tooth is in meshing transmission with the rack.

[0007] Preferably, the bottom end of each second measuring rod is provided with a detection contact assembly, which comprises an installation block fixedly installed at the bottom of the second measuring rod, a rotating shaft installed through an installation hole of the installation block, a roller fixedly installed at the end of the rotating shaft away from the installation block, a pressure-sensitive resistor provided on the outer wall of the roller, an inclined surface provided on the roller, a plane mirror provided on the inclined surface for reflecting infrared light, and a third motor fixedly installed on the installation block for driving the rotating shaft to rotate and adjust.

[0008] Preferably, the top of each first measuring rod is provided with a length measuring mechanism for measuring the length of the side corresponding to the opening angle of the two swing rods, which comprises a fixed block, a horizontal rod fixedly installed on the side wall of the fixed block in the transverse direction, and a movable block installed on the horizontal rod; the bottom end of the fixed block and the horizontal rod are respectively rotationally connected to the top of the corresponding first measuring rod through a pin shaft; and a scale for displaying the distance is provided on the horizontal rod.

[0009] Preferably, an infrared emitter for emitting infrared light is provided on the movable block, and an infrared receiver for receiving infrared light is provided on the fixed block; the infrared receiver and the infrared emitter are respectively located directly above the plane mirror corresponding to the roller.

[0010] Preferably, the lower surface of the mounting seat is fixedly installed with a plurality of arc plates arranged in a ring shape, and a locking bolt is threadedly connected to each arc plate.

[0011] Preferably, the top of the fixed block and the movable block is fixedly installed with a second electric telescopic rod through an extension block, and the output end of each second electric telescopic rod is fixedly installed with a dotting needle; the top of one of the dotting needles is provided with a marking pen.

[0012] Preferably, the upper surface of the mounting seat is installed with a meshing transmission mechanism for driving the rotation of the rotating ring sleeve, which comprises a second rotating tooth fixedly installed on the upper surface of the mounting seat, a second motor installed on the output shaft of the second rotating tooth, and a plurality of gear teeth arranged in an annular array on the outer wall of the rotating ring sleeve and in meshing transmission with the second motor.

[0013] Preferably, two opposite supporting plates are also fixedly installed on the mounting base, opposite surfaces of the two supporting plates are slidably installed with movable ring sleeves, the inner bottom of the movable ring sleeve is provided with a recording paper disc, the inner top of the movable ring sleeve is fixedly installed with two first electric telescopic rods, the output ends of the two first electric telescopic rods are installed with pressing strips for pressing the recording paper disc, the supporting plate is provided with a limiting assembly for fixing the position of the movable ring sleeve, and the limiting assembly comprises a limiting slot formed in the supporting plate and a limiting bolt arranged in the limiting slot.

[0014] Compared with the prior art, the present application has the following beneficial effects:

[0015] 1、Through the structural design, the lower part of the two swing rods and the inner diameter of the part can form an isosceles triangle, the upper part of the two swing rods and the length measuring mechanism can form another isosceles triangle, and the two isosceles triangles of the upper and lower parts are congruent triangles, that is, the distance between the fixed block and the movable block is equal to the distance of the inner diameter of the part, and through the setting of the scale, the length of the measured inner diameter can be directly obtained, and the influence of the inconvenient reading of the existing measuring mechanism is solved.

[0016] 2、Through the setting of the measuring telescopic assembly, on the one hand, it is convenient to further tightly fit the inner wall where the inner diameter of the part is located, and the accuracy of part measurement is further improved.

[0017] 3、Through the structural setting of the detection contact assembly, due to the angle setting and reflection effect of the plane mirror, when the infrared emitter emits infrared light, the path of the arrow is the propagation path of the light, after being reflected twice by the two symmetrically arranged plane mirrors, the light is finally received by the infrared receiver.

[0018] 4、When the infrared receiver can receive the reflected light, it indicates that the measurement data is correct and has no error, when the infrared receiver cannot receive the light, it indicates that the measurement has an error, the data is abandoned and re-measurement is performed, thereby effectively avoiding the adverse effects caused by the shift of the part position during the measurement of the inner diameter.

[0019] 5. By rotating the ring axially, the present invention allows the detection contact component to be located at different axial positions of the inner diameter of the component, which facilitates multiple measurements of the inner diameter of the component at different positions. By measuring multiple sets of data of the inner diameter of the component, the accuracy and authenticity of the inner diameter measurement can be further improved.

[0020] 6. Through further structural design, after multiple measurements are completed, the dotting needles create a ring-shaped array of through holes on the recording paper tray. A scribing pen, positioned below the concentrated area of ​​through holes, is used to draw a circle on the lower surface of the recording paper tray. When the recording paper tray is removed, the circle on the tray can be compared with the discrete through holes to visually and intuitively determine whether the diameter of the part is up to standard. The recording paper tray also facilitates data storage for future reference. Attached Figure Description

[0021] Figure 1 This is a first-view three-dimensional structural diagram of an internal diameter measuring instrument based on precision mechanical parts according to a preferred embodiment of the present invention.

[0022] Figure 2 for Figure 1 The diagram shows a second-view three-dimensional structure of the internal diameter measuring instrument.

[0023] Figure 3 for Figure 1 The diagram shows the rear view of the internal diameter measuring instrument.

[0024] Figure 4 for Figure 1 The diagram shows a side view of the internal diameter measuring instrument.

[0025] Figure 5 for Figure 1 The diagram shows the front view of the internal diameter measuring instrument.

[0026] Figure 6 This is a three-dimensional cross-sectional view of the internal diameter measuring instrument based on precision mechanical parts according to a preferred embodiment of the present invention.

[0027] Figure 7 This is a BB cross-sectional three-dimensional structural diagram of an inner diameter measuring instrument based on precision mechanical parts according to a preferred embodiment of the present invention.

[0028] Figure 8 This is a bottom view of the preferred embodiment of the internal diameter measuring instrument based on precision mechanical parts of the present invention.

[0029] Figure 9C-C section structure schematic view of the inner diameter measuring instrument based on mechanical precision parts of the preferred embodiment of the present application;

[0030] Figure 10 C-C section structure schematic view of the inner diameter measuring instrument based on mechanical precision parts of the preferred embodiment of the present application;

[0031] Figure 11 A enlarged structure schematic view of the inner diameter measuring instrument based on mechanical precision parts of the preferred embodiment of the present application;

[0032] Figure 12 Infrared light path structure schematic view of the inner diameter measuring instrument based on mechanical precision parts of the preferred embodiment of the present application.

[0033] In the figure: 1, mounting seat; 2, support plate; 3, movable ring sleeve; 4, limiting groove; 5, limiting bolt; 6, first electric telescopic rod; 7, pressing strip; 8, recording paper disc; 9, cross bar; 10, movable block; 11, infrared receiver; 12, infrared emitter; 13, second electric telescopic rod; 14, extension block; 15, dotting needle; 16, fixed column; 17, rotating ring sleeve; 18, gear tooth; 19, arc plate; 20, locking bolt; 21, connecting rod; 22, mounting piece; 23, third electric telescopic rod; 24, connecting strip; 25, swing rod; 26, first measuring rod; 27, second measuring rod; 28, first rotating gear; 29, rack; 30, first motor; 31, scale; 32, roller; 33, pressure sensitive resistor; 34, plane mirror; 35, mounting block; 36, rotating shaft; 37, second motor; 38, second rotating gear; 39, third motor; 40, fixed block. DETAILED DESCRIPTION

[0034] In the description of the present application, it should be understood that the terms "length", "width", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application. The embodiments of the present application will be described in detail below with reference to the drawings.

[0035] Please refer to Figures 1 to 12The application provides a preferred embodiment technical scheme: a inner diameter measuring instrument based on mechanical precision parts, which comprises a mounting seat 1, a rotating ring sleeve 17 is mounted on the mounting seat 1, two opposite fixed columns 16 are fixedly installed on the inner wall of the rotating ring sleeve 17, rotatable mounting pieces 22 are respectively installed on the opposite surfaces of the two fixed columns 16, swing rods 25 are respectively fixedly installed on the opposite surfaces of the two mounting pieces 22, and measuring telescopic assemblies are slidably installed on the opposite surfaces of the two swing rods 25.

[0036] A connecting rod mechanism for opening or closing the two swing rods 25 is installed on one of the fixed columns 16, the connecting rod mechanism comprises a third electric telescopic rod 23 fixedly installed on the upper surface of the fixed column 16, a transversely arranged connecting strip 24 is fixedly installed at the output end of the third electric telescopic rod 23, two connecting rods 21 are hingedly installed at the end, away from the third electric telescopic rod 23, of the connecting strip 24, and the two connecting rods 21 are respectively rotatably connected with the side walls of the corresponding swing rods 25.

[0037] The connecting rod mechanism is arranged, the third electric telescopic rod 23 is driven to telescopically move, the connecting strip 24 is further driven to ascend and descend, the two swing rods 25 can be further opened or closed due to the connecting action of the connecting rods 21 and the swing rods 25, when the two swing rods 25 are opened by a certain angle, the detection contact assembly can be attached to the inner wall where the inner diameter of the precision part to be measured is located, due to the structural arrangement, Figure 1 and 12 , the lower part where the two swing rods 25 are located and the inner diameter of the part can form an isosceles triangle, the upper part where the two swing rods 25 are located and the length measuring mechanism can form another isosceles triangle, and the two isosceles triangles of the upper and lower parts are congruent triangles, that is, the distance between the fixed block 40 and the movable block 10 is equal to the distance of the inner diameter of the part, thereby solving the influence of inconvenient reading of the existing measuring mechanism.

[0038] Further, each measuring telescopic assembly comprises a first measuring rod 26 and a second measuring rod 27, the first measuring rod 26 and the second measuring rod 27 are respectively slidably installed in the corresponding installation grooves of the swing rods 25, the opposite surfaces of the first measuring rod 26 and the second measuring rod 27 are respectively provided with racks 29, a first motor 30 is fixedly installed in the interior of the mounting piece 22, a first rotating tooth 28 is fixedly installed on the output shaft of the first motor 30 and extends between the first measuring rod 26 and the second measuring rod 27, and the first rotating tooth 28 is in mesh transmission with the racks 29.

[0039] The measuring telescopic assembly is arranged, and Figure 8 and 9As shown, when the first motor 30 is working, it drives the first rotating gear 28 to rotate. Due to the meshing transmission between the first rotating gear 28 and the rack 29, when the first rotating gear 28 rotates counterclockwise, the first measuring rod 26 and the second measuring rod 27 move in opposite directions. Since both are driven by the meshing of the first rotating gear 28, their movements are equidistant and opposite in direction, ensuring that the two isosceles triangles at the top and bottom are always congruent triangles. That is, the distance between the fixed block 40 and the movable block 10 is always equal to the distance of the inner diameter of the part. The second measuring rod 27 drives the detection contact assembly to move, which on the one hand facilitates closer contact with the inner wall where the inner diameter of the part is located, further improving the accuracy of the part measurement. On the other hand, since the length of the second measuring rod 27, where the swing rod 25 is located, is adjustable, it can measure the inner diameter grooves at different depths of the part, further improving work efficiency.

[0040] Furthermore, each second measuring rod 27 is provided with a detection contact assembly at its bottom end. The detection contact assembly includes a mounting block 35 fixed to the bottom of the second measuring rod 27. A rotating shaft 36 is mounted on the mounting block 35 through a mounting hole. A roller 32 is fixedly mounted on the end of the rotating shaft 36 away from the mounting block 35. A piezoresistor 33 is provided on the outer wall of the roller 32. An inclined surface is provided on the roller 32. A plane mirror 34 for reflecting infrared light is provided on the inclined surface. The plane mirror 34 is set at 45°. A third motor 39 for driving the rotating shaft 36 to rotate and adjust is also fixed on the mounting block 35.

[0041] By probing the structural configuration of the contact components, such as Figure 6 and 11 The axial position of the roller 32 can be finely adjusted by the third motor 39. When the pressure-sensitive resistor 33 is in contact with the inner wall where the inner diameter of the part to be measured is located, the opening degree of the swing rod 25 is the length of the inner diameter of the part to be measured.

[0042] Furthermore, a length measuring mechanism is provided at the top of the two first measuring rods 26. The length measuring mechanism is used to measure the length of the side corresponding to the opening angle of the two swing rods 25. The length measuring mechanism includes a fixed block 40. A crossbar 9 is horizontally fixedly installed on the side wall of the fixed block 40. A movable block 10 is installed on the crossbar 9. The bottom ends of the fixed block 40 and the crossbar 9 are respectively rotatably connected to the top of the corresponding first measuring rod 26 through pins. A scale 31 for displaying distance is provided on the crossbar 9.

[0043] like Figure 1 and 12When the two swing rods 25 are opened at a certain angle, the detection contact component can be made to fit against the inner wall where the inner diameter of the precision part to be measured is located. Since the two isosceles triangles at the top and bottom are congruent triangles, that is, the distance between the fixed block 40 and the movable block 10 is equal to the distance of the inner diameter of the part. The distance between the fixed block 40 and the movable block 10 can be directly obtained by setting the scale 31 to obtain the length of the inner diameter after measurement.

[0044] Furthermore, the movable block 10 is provided with an infrared emitter 12 for emitting infrared light, and the fixed block 40 is provided with an infrared receiver 11 for receiving infrared light. The infrared receiver 11 and the infrared emitter 12 are respectively located directly above the plane mirror 34 where the corresponding roller 32 is located.

[0045] The pressure-sensitive resistor 33 mounted on the roller 32 and the plane mirror 34, with the plane mirror 34 set at 45°, generate a pressure signal when the pressure-sensitive resistor 33 comes into contact with the inner wall of the part to be measured, and transmits the signal to the microcontroller. The microcontroller then controls the infrared emitter 12 to emit infrared light. Due to the angle and reflection effect of the plane mirror 34, when the infrared emitter 12 emits infrared light, as... Figure 12 As shown, the path indicated by the arrow is the propagation path of the light. After passing through two symmetrically arranged plane mirrors 34, the light is reflected twice and finally received by the infrared receiver 11. When the infrared receiver 11 can receive the reflected light, it means that the measurement data is correct and without error. When the infrared receiver 11 cannot receive the light, it means that there is an error in the measurement, the data is discarded, and the measurement is repeated.

[0046] Furthermore, a plurality of arc plates 19 arranged in a ring are fixed on the lower surface of the mounting base 1, and each arc plate 19 is threaded with a locking bolt 20.

[0047] The measuring instrument is placed on top of the precision part to be measured by means of the arc plate 19 at the bottom of the mounting base 1 and the locking bolt 20 threaded on it. Then, by manually rotating the multiple locking bolts 20, the locking bolts 20 are made to abut against the outer wall of the top of the precision part, thereby fixing the measuring instrument on top of the precision part to be measured.

[0048] Furthermore, the tops of the fixed block 40 and the movable block 10 are respectively fixedly installed with second electric telescopic rods 13 via extension blocks 14, and dotting needles 15 are fixedly installed at the output ends of the two second electric telescopic rods 13, with a marking pen provided on the top of one of the dotting needles 15.

[0049] When an inner diameter measurement is completed and the infrared receiver 11 can receive the reflected light, the microcontroller controls the second electric telescopic rod 13 located at the top of the fixed block 40 and the crossbar 9 to work. This causes the corresponding dotting needle 15 to move upward. The dotting needle 15 then marks two points at the corresponding position on the recording paper tray 8. The distance between the two points is the distance between the fixed block 40 and the movable block 10, which is equal to the distance of the component's inner diameter. After multiple measurements are completed, the dotting needle 15 creates a ring array of through holes on the recording paper tray 8. Through the top of one of the dotting needles 15... The marking pen installed in the part first drives the third electric telescopic rod 23 to adjust the opening degree of the swing rod 25 so that the marking pen is located below the concentrated area of ​​through holes. Then, it further drives the second electric telescopic rod 13 so that the marking pen contacts the lower surface of the recording paper tray 8. Then, it drives the second rotating tooth 38 to work, which drives the rotating ring 17 to rotate one revolution. At this time, the marking pen on the top of the dot needle 15 can draw a circle on the lower surface of the recording paper tray 8. When the recording paper tray 8 is removed, the circle on the recording paper tray 8 can be analyzed and compared with the discrete through holes of the accessory to intuitively determine whether the diameter of the part is qualified. The setting of the recording paper tray 8 makes it convenient to save the data for future reference.

[0050] Furthermore, the upper surface of the mounting base 1 is equipped with a meshing transmission mechanism for driving the rotating ring 17 to rotate. The meshing transmission mechanism includes a second rotating tooth 38 fixedly mounted on the upper surface of the mounting base 1. The output shaft of the second rotating tooth 38 is equipped with a second motor 37. The outer wall of the rotating ring 17 has a ring array of teeth 18 that mesh with the second motor 37.

[0051] like Figure 2 As shown, by driving the second rotating tooth 38 to work, due to the meshing action of the second motor 37 and the tooth 18, the axial rotation of the rotating ring 17 can be further realized, so that the detection contact assembly is located at different axial positions of the inner diameter of the component, which facilitates multiple measurements of the inner diameter of the component at different positions. By measuring multiple sets of data of the inner diameter of the component, the accuracy and authenticity of the inner diameter measurement can be further improved.

[0052] Furthermore, two opposing support plates 2 are fixedly installed on the mounting base 1. A movable ring 3 is slidably installed on the opposing surfaces of the two support plates 2. A recording paper tray 8 is provided at the inner bottom of the movable ring 3. Two first electric telescopic rods 6 are fixedly installed at the inner top of the movable ring 3. Pressure strips 7 for pressing the recording paper tray 8 are installed at the output ends of the two first electric telescopic rods 6. A limiting component for fixing the position of the movable ring 3 is provided on the support plate 2. The limiting component includes a limiting groove 4 opened on the support plate 2 and a limiting bolt 5 adapted to it inside the limiting groove 4.

[0053] like Figure 1 As shown, by setting the first electric telescopic rod 6 and the pressure bar 7, the recording paper tray 8 can be fixedly installed at the inner bottom of the movable ring sleeve 3. By adjusting the height of the movable ring sleeve 3, when the limiting bolt 5 spirals into the limiting groove 4 and abuts against the outer wall of the movable ring sleeve 3, the height of the movable ring sleeve 3 can be fixed.

[0054] The measurement method based on precision mechanical parts, using the aforementioned internal diameter measuring instrument for precision mechanical parts, includes the following steps:

[0055] S1: When the inner diameter measurement is completed and the infrared receiver 11 can receive the reflected light, the microcontroller controls the second electric telescopic rod 13 located at the top of the fixed block 40 and the crossbar 9 to work, thereby driving the dotting needle 15 at the corresponding position to move upward. At this time, the dotting needle 15 can make two dots at the corresponding recording paper tray 8 position. The distance between the two dots is the distance between the fixed block 40 and the movable block 10, which is equal to the distance of the inner diameter of the component.

[0056] S2: After multiple sets of measurements are completed, due to the action of the dotting pin 15, a ring array of through holes will be formed on the recording paper tray 8;

[0057] S3: Using the marking pen set on the top of one of the dotting pins 15, the third electric telescopic rod 23 is first driven to adjust the opening degree of the swing rod 25 so that the marking pen is located below the concentrated area of ​​the through holes. Then, the second electric telescopic rod 13 is driven to make the marking pen contact the lower surface of the recording paper tray 8. The second rotating tooth 38 is driven to work again, which can drive the rotating ring 17 to rotate one revolution. At this time, the marking pen set on the top of the dotting pin 15 can draw a circle on the lower surface of the recording paper tray 8. When the recording paper tray 8 is removed, the circle on the recording paper tray 8 can be analyzed and compared with the discrete through holes of the accessories to intuitively determine whether the diameter of the part is qualified.

[0058] S4: By setting the recording tray 8, data can be easily saved and viewed later.

[0059] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Detachable installation can take many forms, such as through a combination of plug-in and snap-fit ​​connections, or through bolted connections, etc.

[0060] The foregoing, in conjunction with embodiments and accompanying drawings, has clearly and completely described the concept, specific structure, and resulting technical effects of the present invention, so as to fully understand the purpose, features, and effects of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of them. Other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are all within the scope of protection of the present invention. Furthermore, all connections / linkages mentioned herein do not simply refer to direct contact between components, but rather to the possibility of forming a better connection structure by adding or reducing connecting accessories, depending on the specific implementation.

[0061] The above embodiments, which describe the specific features of the present invention, are only used to further illustrate the present invention and should not be construed as limiting the scope of protection of the present invention. Any non-essential improvements and adjustments made to the present invention by those skilled in the art based on the above description of the invention shall fall within the scope of protection of the present invention.

Claims

1. An internal diameter measuring instrument based on precision mechanical parts, comprising a mounting base (1), characterized in that: A rotating ring sleeve (17) is installed on the mounting base (1). Two opposing fixed columns (16) are fixedly installed on the inner wall of the rotating ring sleeve (17). Rotatable mounting parts (22) are respectively installed on the opposite surfaces of the two fixed columns (16). Swing rods (25) are respectively fixedly installed on the opposite surfaces of the two mounting parts (22). Measuring telescopic components are respectively slidably installed on the opposite back surfaces of the two swing rods (25). One of the fixed columns (16) is equipped with a linkage mechanism for opening or closing the two swing rods (25). The linkage mechanism includes a third electric telescopic rod (23) fixedly installed on the upper surface of the fixed column (16). A horizontally arranged connecting strip (24) is fixedly installed at the output end of the third electric telescopic rod (23). Two connecting rods (21) are hinged to the end of the connecting strip (24) away from the third electric telescopic rod (23). The two connecting rods (21) are rotatably connected to the side wall of the corresponding swing rod (25). Each set of telescopic measuring components includes a first measuring rod (26) and a second measuring rod (27). The first measuring rod (26) and the second measuring rod (27) are slidably installed in the corresponding mounting slots on the swing rod (25). The opposing surfaces of the first measuring rod (26) and the second measuring rod (27) are respectively provided with racks (29). A first motor (30) is fixedly installed inside the mounting component (22). The output shaft of the first motor (30) extends between the first measuring rod (26) and the second measuring rod (27) and is fixedly installed with a first rotating tooth (28). The first rotating tooth (28) meshes with the rack (29) for transmission. Each of the second measuring rods (27) is provided with a detection contact assembly at its bottom end. The detection contact assembly includes a mounting block (35) fixed to the bottom of the second measuring rod (27). A rotating shaft (36) is mounted on the mounting block (35) through a mounting hole. A roller (32) is fixedly mounted on the end of the rotating shaft (36) away from the mounting block (35). A pressure-sensitive resistor (33) is provided on the outer wall of the roller (32). An inclined surface is provided on the roller (32). A plane mirror (34) for reflecting infrared light is provided on the inclined surface. The plane mirror (34) is set at 45°. A third motor (39) for driving the rotating shaft (36) to rotate and adjust is also fixed on the mounting block (35). The top of the two first measuring rods (26) is provided with a length measuring mechanism. The length measuring mechanism is used to measure the length of the side corresponding to the opening angle of the two swing rods (25). The length measuring mechanism includes a fixed block (40). A crossbar (9) is horizontally fixedly installed on the side wall of the fixed block (40). A movable block (10) is installed on the crossbar (9). The bottom ends of the fixed block (40) and the crossbar (9) are respectively rotatably connected to the top of the corresponding first measuring rod (26) through pins. The crossbar (9) is provided with a scale (31) for displaying distance. The movable block (10) is provided with an infrared emitter (12) for emitting infrared light, and the fixed block (40) is provided with an infrared receiver (11) for receiving infrared light. The infrared receiver (11) and the infrared emitter (12) are respectively located directly above the plane mirror (34) where the corresponding roller (32) is located.

2. The internal diameter measuring instrument based on precision mechanical parts according to claim 1, characterized in that: The lower surface of the mounting base (1) is fixed with a plurality of arc plates (19) arranged in a ring, and each arc plate (19) is threaded with a locking bolt (20).

3. The internal diameter measuring instrument based on precision mechanical parts according to claim 2, characterized in that: The tops of the fixed block (40) and the movable block (10) are respectively fixedly installed with second electric telescopic rods (13) via extension blocks (14). The output ends of the two second electric telescopic rods (13) are fixedly installed with dotting needles (15), and one of the dotting needles (15) is provided with a drawing pen on its top.

4. The internal diameter measuring instrument based on precision mechanical parts according to claim 3, characterized in that: The upper surface of the mounting base (1) is equipped with a meshing transmission mechanism for driving the rotating ring sleeve (17) to rotate. The meshing transmission mechanism includes a second rotating tooth (38) fixedly installed on the upper surface of the mounting base (1). The output shaft of the second rotating tooth (38) is equipped with a second motor (37). The outer wall of the rotating ring sleeve (17) has a ring array of teeth (18) that mesh with the second motor (37).

5. The internal diameter measuring instrument based on precision mechanical parts according to claim 4, characterized in that: Two opposing support plates (2) are also fixedly installed on the mounting base (1). A movable ring sleeve (3) is slidably installed on the opposing surfaces of the two support plates (2). A recording paper tray (8) is provided at the bottom inner side of the movable ring sleeve (3). Two first electric telescopic rods (6) are fixedly installed at the top inner side of the movable ring sleeve (3). A pressure strip (7) for pressing the recording paper tray (8) is installed at the output end of the two first electric telescopic rods (6). A limiting component for fixing the position of the movable ring sleeve (3) is provided on the support plate (2). The limiting component includes a limiting groove (4) opened on the support plate (2) and a limiting bolt (5) adapted to it is provided inside the limiting groove (4).

6. A measurement method based on precision mechanical parts, characterized in that, The measurement method using the internal diameter measuring instrument based on precision mechanical parts as described in claim 5 includes the following steps: S1: When the inner diameter measurement is completed and the infrared receiver (11) can receive the reflected light, the microcontroller controls the second electric telescopic rod (13) located at the top of the fixed block (40) and the crossbar (9) to work, thereby driving the dotting needle (15) at the corresponding position to move upward. At this time, the dotting needle (15) can make two dots at the corresponding recording paper tray (8). The distance between the two dots is the distance between the fixed block (40) and the movable block (10), which is equal to the distance of the inner diameter of the component. S2: After multiple sets of measurements are completed, due to the action of the dotting needle (15), a ring array of through holes will be formed on the recording paper plate (8); S3: By using the scribing pen set on the top of one of the dotting pins (15), first drive the third electric telescopic rod (23) to adjust the opening degree of the swing rod (25) so that the scribing pen is located below the concentrated area of ​​the through holes. Then drive the second electric telescopic rod (13) to make the scribing pen contact the lower surface of the recording paper tray (8). Drive the second rotating tooth (38) to work again, which can drive the rotating ring sleeve (17) to rotate one revolution. At this time, the scribing pen set on the top of the dotting pin (15) can draw a circle on the lower surface of the recording paper tray (8). When the recording paper tray (8) is removed, the circle on the recording paper tray (8) can be analyzed and compared with the discrete through holes of the accessories to intuitively determine whether the diameter of the part is qualified. S4: By setting the recording tray (8), it is convenient to save the data and to view it in the future.

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