CN115371525A

CN115371525A - Measuring gauge and rapid measuring method in production process of large-diameter inner taper hole product

Info

Publication number: CN115371525A
Application number: CN202211008889.9A
Authority: CN
Inventors: 孙景屹; 杜鑫; 胡晓飞
Original assignee: CRRC Dalian Co Ltd
Current assignee: CRRC Dalian Co Ltd
Priority date: 2022-08-22
Filing date: 2022-08-22
Publication date: 2022-11-22

Abstract

The invention provides a measuring gauge in the production process of a large-diameter inner taper hole product, which comprises a supporting structure, a positioning structure and a gauge stand adjusting structure. The method comprises the following steps: s1, before measurement, a standard ring gauge is used for calibrating and zeroing the gauge: s11, placing the gauge into a standard ring gauge, adjusting the proper distance between the positioning adjusting rod and the gauge stand adjusting rod according to the size of the inner hole of the standard ring gauge, and screwing a fixing bolt; s12, clamping an inner hole of the ring gauge by using a positioning bolt, swinging the cross beam, and adjusting the positions of the two dial gauges at the maximum diameter to be zero points; s2, when a measured product is measured, the calibrated gauge is placed in an inner conical hole of the measured product to be measured, the inner conical hole is clamped by the positioning bolt, the cross beam is swung, the two dial gauges are adjusted to be in the maximum diameter position, and data of the two dial gauges are observed and recorded. The invention can reduce labor intensity and improve production efficiency.

Description

Measuring gauge and rapid measuring method in production process of large-diameter inner taper hole product

Technical Field

The invention relates to the technical field of taper measurement, in particular to a measuring gauge and a rapid measuring method in the production process of a large-diameter inner taper hole product.

Background

The driven gear and the wheels of the locomotive are matched with the axle by adopting taper hole interference fit connection, the size precision is high, and when the size of the taper hole structure is measured, the conventional method adopts plug gauge detection. And comparing the dimension of the plug gauge qualified in measurement with the dimension of the taper hole required by a drawing, converting the dimension into an H value, and putting the plug gauge into the taper hole during detection to measure the H value as a standard for detecting the dimension of the taper hole. Because the structure limits that one plug gauge can only detect one product, even the product which exceeds the detected taper hole by 1mm cannot be used, the measuring tool can only be redesigned, and meanwhile, for the plug gauge which detects the overlarge size of the taper hole, the self weight of the plug gauge is correspondingly increased, and the operation is extremely inconvenient.

At present, the taper hole detection is carried out by a common plug gauge, and two modes are specifically provided: 1. and comparing the plug gauge size qualified in measurement with the taper hole size, and converting into an H value to be used as a detection standard of the taper hole size. When the size of the taper hole is detected, the plug gauge is placed in the taper hole, and the H value is measured to judge whether the taper hole is qualified or not; 2. the cinnabar printing oil is uniformly coated on the surface of the plug gauge, the plug gauge is put into the taper hole and slightly rotated and then taken out, and the trace of the cinnabar printing oil in the taper hole is visually inspected to judge whether the contact area meets the standard requirement. But has the following disadvantages:

(1) The plug gauge has uniqueness, one plug gauge can only detect products with one taper hole specification, even products with the diameter of more than 1mm of the detected taper hole cannot be used, and only the production gauge can be redesigned.

(2) The operability is poor, and for a plug gauge with a large taper hole size, the self weight of the measuring tool is also large and even can reach dozens of kilograms, and the operation is inconvenient. Fig. 1 shows a simple diagram of a conventional plug gauge measurement, namely, the plug gauge needs to be manually placed into an inner hole of a product to be measured. And then measuring the value A, and converting whether the diameter of the large end of the inner hole meets the design requirement. However, the different forces of each person putting the plug gauge result in different measured values of a. This is an inevitable drawback of conventional plug gauges.

(3) The measuring accuracy is lower, and the taper hole angle can not directly be detected out when traditional plug gauge detects, needs the contact surface of artificial judgement plug gauge and the product taper hole of being surveyed to connect indirectly and draw the conclusion. The surface of the plug gauge is coated with special red paint, the plug gauge is properly placed into an inner cone hole of a tested product, and then the plug gauge is taken out to visually observe the proportion of the inner cone hole of the tested product which is stained with the red paint (when the proportion reaches more than 85 percent, the plug gauge is qualified). However, this method requires a very specialized person to perform the operation, since the thickness of the applied red, the force of placing the plug gauge, and the proportion of the contact area visually observed are all human factors that affect the final result uncontrollably. There is a large error.

Disclosure of Invention

According to the prior art provided by the above, the plug gauge has uniqueness, only a product with a taper hole specification can be detected by one plug gauge, even a product which exceeds the detected taper hole by 1mm cannot be used, and only a production gauge can be redesigned; the operability is poor, and for a plug gauge with a large taper hole size, the self weight of the measuring tool is also large and even can reach dozens of kilograms, so that the operation is inconvenient; the measuring gauge and the rapid measuring method have the advantages that the measuring precision is low, the angle of the taper hole cannot be directly detected during detection of a traditional plug gauge, and the contact surface between the plug gauge and the taper hole in a product to be measured needs to be manually judged to indirectly obtain a conclusion, so that the measuring gauge and the rapid measuring method in the production process of the large-diameter taper hole product are provided. The invention mainly adopts a simple and easy measuring method and a device, the measuring main body is a dial gauge which can be embedded or clamped on a special gauge stand, compared with the traditional plug gauge, the H value measuring and observing precision is higher, and the advantage of the gauge is better than that of a heavy plug gauge under the condition of larger inner hole diameter, and the measurement is particularly convenient and easy.

The technical means adopted by the invention are as follows:

a gauge in the production process of large-diameter inner taper hole products comprises: the upper part of the positioning structure is arranged on one side of the supporting structure, and the lower part of the positioning structure is in contact with the inner wall of one side of an inner hole of a workpiece to be measured during measurement; the upper portion of gauge stand adjustment structure is installed at the bearing structure opposite side, and two amesdials are installed to the lower part, and two amesdials contact with the opposite side inner wall of the hole of the work piece that is surveyed when measuring.

Further, the supporting structure adopts a cross beam.

Furthermore, the positioning structure comprises a first base and a positioning adjusting rod, the first base is mounted on the cross beam and can move on the cross beam, and the first base is in contact with the upper end face of one side of the inner hole during measurement; the lower extreme at first base is connected to the location adjusting lever, and the sub-unit connection of location adjusting lever has positioning bolt, and positioning bolt contacts with the one side inner wall of the hole of the work piece that is surveyed when measuring.

Furthermore, the front end of the positioning bolt is a round head body, and point contact is formed between the round head body and the inner wall of the inner hole.

Furthermore, the gauge stand adjusting structure comprises a second base and a gauge stand adjusting rod, the second base is mounted on the cross beam and can move on the cross beam, and the second base is in contact with the upper end face of the other side of the inner hole during measurement; the gauge stand adjusting rod is connected at the lower extreme of second base, and two amesdials are installed on the gauge stand adjusting rod at interval from top to bottom.

Furthermore, the first base is connected with the cross beam through a fixing bolt, and the bottom surface of the first base, which is in contact with the cross beam, is smooth and flat.

Furthermore, the second base is connected with the cross beam through a fixing bolt, and the bottom surface of the second base, which is in contact with the cross beam, is smooth and flat.

The invention also provides a rapid measuring method, which uses the measuring gauge in the production process of the large-diameter inner taper hole product, and comprises the following steps:

s1, before measurement, a standard ring gauge is used for calibrating and zeroing the gauge:

s11, placing the gauge into a standard ring gauge, adjusting the proper distance between a positioning adjusting rod and a gauge stand adjusting rod according to the size of an inner hole of the standard ring gauge, and screwing a fixing bolt;

s12, clamping an inner hole of the standard ring gauge by using a positioning bolt, swinging the cross beam, and adjusting the positions of the two dial gauges at the maximum diameter to be zero points;

s2, when the product to be measured is measured, the calibrated gauge is placed into the inner conical hole of the product to be measured to measure, the inner conical hole is clamped by the positioning bolt, the cross beam is swung, the two dial gauges are adjusted to be in the position with the largest diameter, and data of the two dial gauges are observed and recorded.

Further, in the step S2, if the dial indicator data is zero, the size of the product to be measured is consistent with that of the standard ring gauge; if the dial indicator data is not zero, the device is compared and adjusted according to the data conversion angle by using the correction parameter principle, and the size of the inner taper hole is further corrected.

Further, the principle of the calibration parameters is as follows: the taper angle of the standard ring gauge is calculated by utilizing the principle that two points form a line and a trigonometric function as follows:

α＝2arctg{(D1-D2)/2(L2-L1)}；

in the formula, parameters can be compared with a standard ring gauge metering value, wherein L1 is the distance between a first dial indicator and a reference surface, D1 is the virtual diameter of the first dial indicator at a taper hole measuring point, L2 is the distance between a second dial indicator and the reference surface, and D2 is the virtual diameter of the second dial indicator at the taper hole measuring point;

when the measured data of the first dial indicator is delta 1 and the data of the second dial indicator is delta 2, the measured product cone angle and the standard ring gauge cone angle are in and out, the measured angle is alpha 1=2arctg { (D1-D2)/2 (L2-L1) + (delta 1-delta 2)/2 (L2-L1) }, and the difference value can be compared with the standard ring gauge cone angle alpha to determine whether the difference value is within the tolerance range; if the tolerance range is exceeded, the equipment parameters are required to be adjusted according to delta 1 and delta 2, and the secondary machining is properly adjusted according to the design tolerance.

Compared with the prior art, the invention has the following advantages:

1. the measuring gauge and the rapid measuring method provided by the invention have the advantages that the labor intensity is reduced, and the production efficiency is improved.

2. The measuring gauge and the rapid measuring method in the production process of the large-diameter inner taper hole product change the one-to-one detection mode of the traditional plug gauge, achieve the effect of one gauge (gauge) for multiple purposes, and simultaneously reduce the production quantity of the plug gauge and reduce the production cost.

3. The measuring gauge and the rapid measuring method provided by the invention can be used for detecting the product at any time and any place in the grinding process, and greatly reduce the probability of waste products caused by grinding amount deviation.

4. The measuring gauge and the rapid measuring method in the production process of the large-diameter inner taper hole product can accurately measure the size of a workpiece, improve the measuring precision and realize accurate compensation.

In conclusion, the technical scheme of the invention can solve the problem that the prior art has uniqueness, one plug gauge can only detect a product with one taper hole specification, even the product with the diameter of 1mm larger than the detected taper hole can not be used, and only a production gauge can be redesigned; the operability is poor, and for a plug gauge with a large taper hole size, the self weight of the measuring tool is also large and even can reach dozens of kilograms, so that the operation is inconvenient; the measuring accuracy is lower, and the taper hole angle can not be directly detected out when traditional plug gauge detects, need the problem that the contact surface of artificial judgement plug gauge and the product taper hole of being surveyed meets the indirect conclusion that draws.

Based on the reasons, the method can be widely popularized in the fields of large-diameter inner taper hole measurement and the like.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a simplified view of a conventional plug gauge, in which (a) is a front view and (b) is a perspective view.

FIG. 2 is a schematic view of the present invention.

Fig. 3 is a partial structural schematic diagram of the present invention.

FIG. 4 is a schematic structural diagram of a workpiece (locomotive traction gear) to be tested according to the present invention.

FIG. 5 is a schematic diagram of a calibration gauge of the present invention.

FIG. 6 is a schematic diagram of the measurement of the product of the present invention.

In the figure: 1. a cross beam; 2. positioning the adjusting rod; 3. a gauge stand adjusting lever; 4. a first kilo-decimeter; 5. a second dial indicator; 6. positioning the bolt; 7. fixing the bolt; 8. measuring a gauge; 9. a standard ring gauge; 10. and (5) testing the product.

Detailed Description

It should be noted that the embodiments and features of the embodiments of the present invention may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. As used herein, the singular forms "a", "an", and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.

The relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. Any specific values in all examples shown and discussed herein are to be construed as exemplary only and not as limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.

In the description of the present invention, it is to be understood that the orientation or positional relationship indicated by the directional terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal" and "top, bottom", etc., are generally based on the orientation or positional relationship shown in the drawings, and are used for convenience of description and simplicity of description only, and in the absence of any contrary indication, these directional terms are not intended to indicate and imply that the device or element so referred to must have a particular orientation or be constructed and operated in a particular orientation, and therefore should not be considered as limiting the scope of the present invention: the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.

For ease of description, spatially relative terms such as "over 8230," "upper surface," "above," and the like may be used herein to describe the spatial positional relationship of one device or feature to other devices or features as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary terms "at 8230; \8230; above" may include both orientations "at 8230; \8230; above" and "at 8230; \8230; below". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

It should be noted that the terms "first", "second", and the like are used to define the components, and are only used for convenience of distinguishing the corresponding components, and the terms have no special meanings unless otherwise stated, and therefore, the scope of the present invention should not be construed as being limited.

The invention mainly comprises two major structures, namely an integral gauge (a beam 1, a positioning adjusting rod 2 and a gauge stand adjusting rod 3 respectively) which supports a fixed structure, and the other structure is a dial indicator (a first dial indicator 4 and a second dial indicator 5) as shown in figures 2-3. Specifically, the base of the positioning adjusting rod is mounted on one side of the cross beam through a fixing bolt, the gauge stand adjusting rod is mounted on the other side of the cross beam through a fixing bolt, and the positions of the positioning adjusting rod and the gauge stand adjusting rod on the cross beam can be adjusted through the tightness of the fixing bolt. The base of the positioning adjusting rod and the base of the gauge stand adjusting rod can adopt an upper clamping block and a lower clamping block, and the upper clamping block and the lower clamping block are clamped on the cross beam through fixing bolts. The first dial indicator and the second dial indicator are connected to the gauge stand adjusting rod at intervals, the first dial indicator is arranged on the upper portion, and the second dial indicator is arranged on the lower portion.

Before measurement, a standard ring gauge is required to be used for calibrating and zeroing the gauge, and during measurement, the data of the dial gauge is observed to be zeroed. And calculating the taper difference between the taper hole and the standard ring gauge by combining the principle that two points form a line and a trigonometric function, wherein the taper angle alpha =2arctg { (D1-D2)/2 (L2-L1) } of the standard ring gauge. L1 is the distance of the reference surface corresponding to the table 1, D1 is the virtual diameter of the measuring point of the taper hole in the table 1, and similarly, L2 is the distance of the reference surface corresponding to the table 2, D2 is the virtual diameter of the measuring point of the taper hole in the table 2, and the reference surface is the upper end surface of the inner hole. Through the schematic diagrams 2-3 of the invention, it can be found that the invention not only can measure the taper hole, but also is suitable for straight holes, excircle and external conical surfaces as long as the structure is slightly adjusted.

The scheme of the invention simplifies the detection flow, improves the detection precision, realizes the universality and good operability of the measuring tool, can effectively save the production cost of the measuring tool of an enterprise, and directly monitors the product quality.

The invention can solve the following technical problems:

(1) The one-to-one detection mode of the traditional plug gauge is changed, and the application effect of the multi-purpose flexible measuring tool of one gauge (gauge) is achieved (in the schematic diagram of fig. 2, the distance between the positioning adjusting rod 2 and the gauge stand adjusting rod 3 can be adjusted to measure the sizes of different taper holes).

(2) The operability is improved, the light weight design is realized by the gauge, and the operation is convenient. The gauge weighs about 0.5 kg, and the traditional plug gauge weighs tens of kg. The novel design scheme not only reduces labor intensity, but also improves operation efficiency, overcomes the defect that the prior sampling inspection can only be carried out under the line, and the gauge can realize online inspection at any time and any place, thereby being more beneficial to adjusting equipment at any time in the operation process to correct the size of the processed taper hole. The detection method is suitable for mass production of high-precision taper hole products, and comprises the step of quickly switching product production (on-line: the product does not operate equipment under the product; off-line: the product operates equipment under the product).

(3) The detection precision is improved, and the gauge measurement datum is fixed, so that artificial subjective operation factors do not exist, the diameter change value of the taper hole can be directly and accurately measured, and the taper detection precision is improved.

(4) A reasonable and practical detection method is formulated, the change value of the hole machining taper is directly measured by the simplest and most convenient operation method, and the problems of low detection efficiency and poor measurement precision are thoroughly solved.

DETAILED DESCRIPTION OF EMBODIMENT (S) OF INVENTION

1. Gauge measuring tool:

(1) The crossbeam 1 (marked with the number 1 in fig. 2) plays a role in connecting and fixing the integral gauge structure.

(2) The positioning adjusting rod 2 (shown as a mark 2 in fig. 2) is connected with a positioning bolt 6 below, the front end of the positioning bolt is a regular standard round head body, the function of the positioning bolt is to ensure that the contact with an inner hole is point contact, and the bolt positions the whole gauge by taking an inner taper hole as a reference during measurement.

(3) Gauge stand adjusting lever 3 (marked with 3 in fig. 2) for fixed amesdial, two amesdials on this adjusting lever are whole gauge's key place, and two base faces of location adjusting lever and gauge stand adjusting lever must be smooth level and smooth during the measurement, still guarantee that two base planes are unanimous with the crossbeam height, and this height can be decided according to actual product.

2. Measurement method and correction principle:

(1) Before measurement, the standard ring gauge is used for calibrating the gauge and carrying out zero setting operation, as shown in figure 5. And (3) putting the gauge into the standard ring gauge, adjusting the proper distance between the positioning adjusting rod and the gauge stand adjusting rod according to the size of the inner hole of the standard ring gauge, and screwing the fixing bolt 7.

(2) And clamping the inner hole of the ring gauge by using a positioning bolt, swinging the cross beam, and adjusting the position of the dial indicator at the maximum diameter to be a zero point as shown in figures 2-3.

(3) And (3) when measuring the product, operating the same as the step (2), observing and recording data of the two dial indicators, and if the data is zero, indicating that the product is consistent with the standard ring gauge in size. If the data of the two dial indicators are not zero, the correction parameter principle is used, and angle is converted according to the data to compare and adjust the equipment, so that the size of the taper hole is further corrected.

And (3) parameter correction principle: and calculating the taper angle alpha =2arctg { (D1-D2)/2 (L2-L1) } of the standard ring gauge by using a two-point one-line principle and a trigonometric function. The parameters in the formula can be compared with standard ring gauge metering values. When the data of the dial indicator 1 is delta 1 and the data of the dial indicator 2 is delta 2, the measured product cone angle is in or out of the standard ring gauge cone angle, and the measured angle alpha 1= 2arcttg { (D1-D2)/2 (L2-L1) + (delta 1-delta 2)/2 (L2-L1) } can be compared with the standard cone angle alpha to determine whether the difference value is within the tolerance range. If the tolerance is out of tolerance, equipment parameters are required to be adjusted according to delta 1 and delta 2, and secondary machining is properly adjusted according to design tolerance.

3. Example measurement and procedure:

the measured workpiece is a locomotive traction gear (as shown in figure 4), and the basic parameters are as follows:

taper of an inner hole: 1:50.

The size of the large end of the inner taper hole is as follows:

(1) And (3) calibrating the dial gauge by using a standard ring gauge 9 (the standard ring gauge can be put into use after being measured to be qualified), and enabling the pointer of the dial gauge to be zero. As shown in fig. 5.

(2) And (4) placing the calibrated measuring gauge 8 into an inner taper hole of the product 10 to be measured for measurement. And (4) recording the measured value, and enabling the dial indicator to return to zero, namely, the dial indicator is qualified as the value read in the operation (1), as shown in fig. 6.

(3) When the dial indicator reading in the operation (2) does not return to zero, the difference value between the value of the dial indicator reading in the operation (2) and the reading in the operation (1) is the value needing to be adjusted in a machining mode.

The invention has the following beneficial effects: (1) the labor intensity is reduced, and the production efficiency is improved. (2) The one-to-one detection mode of the traditional plug gauge is changed, the effect of one gauge (gauge) for multiple purposes is achieved, and meanwhile, the production quantity of the plug gauge is reduced, so that the production cost is reduced. (3) The product can be detected at any time and any place in the grinding process, and the probability of generating waste products due to the deviation of the grinding amount is greatly reduced. (4) The invention can accurately measure the size of the workpiece, improve the measurement precision and realize accurate compensation.

The key points of the technology of the invention are as follows:

(1) So as to realize the multi-purpose of a table (gauge).

(2) The difference value between the standard ring gauge and the two dial gauges can be measured more accurately.

(3) The manual operation error is reduced, the precision is high, and the error is small.

(4) The device is convenient to operate, can realize online measurement, and has readable data and accurate correction of device parameters.

The protection points of the invention are as follows:

(1) Designing a flexible gauge measuring tool, formulating an efficient detection method, and mutually matching the gauge measuring tool and the efficient detection method to develop a detection technical scheme for large-diameter deep taper hole machining

(2) Two dial gauges are calibrated, and two points are in a line principle.

(3) The measuring gauge consists of a positioning adjusting rod, a gauge seat adjusting rod and a dial indicator.

(4) The measuring method of the inner bore taper comprises the steps of measuring the size positions of two positions through a dial indicator and calculating the inner bore taper.

(5) The dial indicator measured value and the dial indicator-to-base surface distance conversion cone angle are as follows: α =2arctg { (D1-D2)/2 (L2-L1) }.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A gauge for measuring the production process of a large-diameter inner taper hole product is characterized by comprising the following steps: the upper part of the positioning structure is arranged on one side of the supporting structure, and the lower part of the positioning structure is in contact with the inner wall of one side of an inner hole of a workpiece to be measured during measurement; the upper portion of gauge stand adjustment structure is installed at the bearing structure opposite side, and two amesdials are installed to the lower part, and two amesdials contact with the opposite side inner wall of the hole of the work piece that is surveyed when measuring.

2. The gauge for measuring the production process of the large-diameter inner taper hole product, according to claim 1, wherein the supporting structure adopts a cross beam.

3. The gauge in the production process of the large-diameter inner taper hole product, according to claim 2, characterized in that the positioning structure comprises a first base and a positioning adjusting rod, the first base is mounted on the cross beam and can move on the cross beam, and the first base is in contact with the upper end face of one side of the inner hole during measurement; the lower extreme at first base is connected to the location adjusting lever, and the sub-unit connection of location adjusting lever has positioning bolt, and positioning bolt contacts with the one side inner wall of the hole of the work piece that is surveyed when measuring.

4. The gauge in the production process of the large-diameter inner taper hole product as claimed in claim 3, wherein the front end of the positioning bolt is a round head body, and point contact is formed between the round head body and the inner wall of the inner taper hole.

5. The gauge for measuring the large-diameter inner taper hole product in the production process according to claim 2, wherein the gauge stand adjusting structure comprises a second base and a gauge stand adjusting rod, the second base is mounted on the cross beam and can move on the cross beam, and the second base is in contact with the upper end face of the other side of the inner hole during measurement; the gauge stand adjusting rod is connected to the lower end of the second base, and the two dial gauges are installed on the gauge stand adjusting rod at intervals up and down.

6. The gauge for measuring the production process of the large-diameter inner taper hole product according to claim 3, wherein the first base is connected with the cross beam through a fixing bolt, and the bottom surface of the first base, which is in contact with the cross beam, is smooth and flat.

7. The gauge in the production process of the large-diameter inner taper hole product, according to claim 5, characterized in that the second base is connected with the cross beam through a fixing bolt, and the bottom surface of the second base, which is in contact with the cross beam, is smooth and flat.

8. A method for rapidly measuring a large-diameter inner taper hole product in a production process, which is characterized in that the measuring gauge in the production process of the large-diameter inner taper hole product according to any one of claims 1 to 7 is used, and comprises the following steps:

s2, when a measured product is measured, the calibrated gauge is placed in an inner conical hole of the measured product to be measured, the inner conical hole is clamped by the positioning bolt, the cross beam is swung, the two dial gauges are adjusted to be in the maximum diameter position, and data of the two dial gauges are observed and recorded.

9. The method for rapidly measuring the large-diameter inner taper hole product in the production process according to claim 8, wherein in the step S2, if the data of the dial indicator is zero, the dimension of the measured product is consistent with that of a standard ring gauge; if the dial indicator data is not zero, the device is compared and adjusted according to the data conversion angle by using the correction parameter principle, and the size of the inner taper hole is further corrected.

10. The method for rapidly measuring the inner taper hole product with large diameter in the production process according to claim 9, wherein the principle of the calibration parameters is as follows: the taper angle of the standard ring gauge is calculated by utilizing the principle that two points form a line and a trigonometric function as follows:

α＝2arctg{(D1-D2)/2(L2-L1)}；

in the formula, the parameters can be compared with the metering value of a standard ring gauge, wherein L1 is the distance between the first dial indicator and the reference surface, D1 is the virtual diameter of the first dial indicator at the measuring point of the conical hole, L2 is the distance between the second dial indicator and the reference surface, and D2 is the virtual diameter of the second dial indicator at the measuring point of the conical hole;

when the measured data of the first dial indicator is delta 1 and the data of the second dial indicator is delta 2, the measured product cone angle is in or out of the cone angle of the standard ring gauge, and the measured angle is alpha 1=2arctg { (D1-D2)/2 (L2-L1) + (delta 1-delta 2)/2 (L2-L1) } and can be compared with the cone angle alpha of the standard ring gauge to determine whether the difference value is within a tolerance range;

if the tolerance range is exceeded, the equipment parameters are required to be adjusted according to delta 1 and delta 2, and the secondary machining is properly adjusted according to the design tolerance.