CN117848192A - Coaxiality inspection fixing tool and inspection method for folding mechanism joint - Google Patents

Abstract

The invention provides a fixture and a method for checking coaxiality of a folding mechanism joint, wherein the fixture comprises the following components: a bushing (1), a checking pin (2) and a baffle (3); the bushing (1) is used for being placed into the fork lugs of the folding joint when the folding joint is folded to be larger than a preset angle; the checking pin (2) is used for being inserted into the fork lug connecting holes of the fixed joint and the folding joint to check coaxiality when the folding joint is unfolded in place; the baffle (3) is used for fixing the bushing (1) and does not lead the bushing (1) to be separated in the processes of folding, unfolding and using the inspection pin (2) for coaxiality inspection. The rotor wing folding device can meet coaxiality detection requirements, and can avoid damage to parts on the machine caused by falling or sliding of the bushing during folding movement, so that smooth implementation of rotor wing folding related work is ensured.

Description

Coaxiality inspection fixing tool and inspection method for folding mechanism joint

Technical Field

The invention belongs to the field of helicopter ground debugging technology, and relates to a coaxiality inspection fixing tool and an inspection method for a folding mechanism joint.

Background

Coaxiality is the positioning tolerance, and the theoretical correct position is the reference axis. The method is an important parameter of the revolving body part, reflects the deviation degree of the axis of the part and the reference axis, and is divided into bending of the measured axis, inclination of the measured axis and deviation of the measured axis. The coaxiality is poor, so that the normal work and the service condition of the machine can be influenced, and the conditions of vibration noise, part damage, overload burning of the motor and the like can be generated.

In the machine-building industry, especially in the technical field of assembly adjustment, the requirement on coaxiality among different parts is common and higher, but the guarantee of coaxiality is also difficult, because in the process of processing and assembling the parts, the precision of multiple dimensions, such as the dimensional precision of a base, the dimensional precision of a bushing, the dimensional precision of a checking tool and the like, is often involved. Along with the increase of coaxiality detection requirements, corresponding coaxiality detection means are also increasingly abundant. The more detection modes adopted at present are a three-coordinate measurement method, a plane ruler detection method, a true roundness measuring instrument detection method, a typing detection method, a laser centering instrument detection method, a projector measurement method, a coaxiality detection rod and the like, and each detection mode has different characteristics and use scenes. The three-coordinate measurement method can be suitable for measuring shaft parts and hole parts, and is solved by a common axis method, a straightness method and a distance solving method, but the equipment investment is huge, the operation is complex, the efficiency is low and the period is long; the projector measurement method aims at products with high processing precision requirements and small control parts, and the automatic batch measurement cannot be completed although the measurement function is strong; the roundness measuring instrument can be used for products with higher processing precision requirements, and has the defects of lower detection speed, high price and high environmental requirements, and is generally used in laboratories; the meter-punching measuring method is suitable for shaft parts, an enterprise can specially manufacture a tool for realizing quick measurement of coaxiality of holes, but the meter-punching method is only suitable for special objects and has poor universality and adaptability; the coaxiality detection rod is a common tool for detecting coaxiality of products, is simple in structure and convenient to use, but the common coaxiality detection rod is poor in detection precision and is easily limited by detection environments, so that an operator can misjudge the coaxiality of a hole to be detected or cannot achieve the detection purpose at all. In practical measurement, measurement of coaxiality is affected in many ways. The operator has different self quality and understanding of the technological requirements of the drawing; detecting errors of the measuring machine and errors of the probe; the processing state and the surface roughness of the workpiece; selecting a detection method, placing a workpiece and combining probes; the external environment, such as the temperature, humidity, etc. between the detections, can bring certain errors to the measurements. When the coaxiality is adjusted on site, the higher the accuracy requirement on coaxiality adjustment is, the more times of adjusting the workpiece in probability are, and although the thickness to be adjusted can be calculated through the coaxiality error in the mode, in the actual adjustment process, the repeated adjustment is carried out for many times, which is caused by the problems of uneven pretightening force, uneven gaskets and the like, so that the labor intensity is increased, the labor efficiency is reduced, and the skill level requirement on staff is higher.

The folding mechanism in the helicopter rotor folding system mainly comprises a folding joint, a fixed joint, a folding actuator and the like. The folding actuator has the main functions of pulling out pins before blade folding, driving the blades to fold/unfold, and inserting pins after folding. During unfolding operation, the folding actuator drives the folding joint to move circumferentially, and after the folding actuator is unfolded in place, the folding actuator drives the transverse pin to extend out, and the transverse pin penetrates through the fixing joint of the four-fork lugs and the folding joint of the two-fork lugs so as to fix the folding mechanism.

The coaxiality detection of the fork lug connecting holes of the folding joint and the fixed joint is needed in the adjustment work before folding, only a visual inspection or finger feeling mode is required in the design technical condition, the coaxiality detection is not in place easily caused by the manual operation difference in the actual test process, the scratch and displacement of the embedded bushing on the machine are caused in the process of extending the transverse pin, and similar faults are caused in the actual ground process for many times, so that the large economic loss and the production delivery schedule influence are caused. Because the above-mentioned work needs to be implemented on-machine, the detection operation space is limited, and for the to-be-detected product with the detection aperture in the form of 'small outside and large inside' in the system, effective and safe detection tools and methods are lacking at present.

Disclosure of Invention

The invention provides a coaxiality inspection fixing tool and an inspection method for a folding mechanism joint, which not only can meet coaxiality detection requirements, but also can prevent damage to parts on a machine caused by falling or sliding of a bushing during folding movement and ensure smooth implementation of relevant folding work of a rotor wing.

The first aspect of the present invention provides a fixture for checking and fixing coaxiality of joints of a folding mechanism, comprising: a bushing (1), a checking pin (2) and a baffle (3);

the bushing (1) is put into the fork lugs of the folding joint when the folding joint is folded to be larger than a preset angle;

the checking pin (2) is inserted into the fork lug connecting holes of the fixed joint and the folding joint to check coaxiality when the folding joint is unfolded in place;

the baffle (3) is used for fixing the bushing (1) and does not lead the bushing (1) to be separated in the processes of folding, unfolding and using the inspection pin (2) for coaxiality inspection.

Optionally, the edge of the lining (1) does not protrude into the hole of the folding joint fork lug to be embedded with the lining.

Optionally, the outer diameter of the bushing (1) is matched with the inner diameter of the hole of the folding joint fork lug through a tolerance zone.

Optionally, the inner diameter of the bushing (1) is not larger than the inner diameter of the hole of the fixed joint fork ear.

Optionally, the section of the baffle (3) is in an inverted J shape and is hung and arranged at the rear part of the fork lug of the folding joint;

a flange is arranged on one side edge of the straight-line section part of the baffle (3), and when the folding joint fork lug is inserted into the fixed joint fork lug, the flange is attached to the U-shaped end face of the fixed joint fork lug.

Optionally, the inspection pin (2) is cylindrical, one end is an inspection end, the other end is a handheld end, and the section of the handheld end is polygonal;

the checking end is a cylinder with the diameter the same as the inner diameter of the lining (1),

or,

the checking end is a stepped cylinder, and the diameters of the two layers of steps are respectively consistent with the inner diameter of the bushing (1) and the inner diameter of the hole of the fixed joint fork lug.

Alternatively, the preset angle is 15 °.

A second aspect of the present invention provides an inspection method for inspecting a fixture for fixing a joint with coaxiality using the folding mechanism as in the first aspect, comprising:

step one: placing the bushing (1) into the fork lugs of the folding joint when the folding joint is folded by more than a preset angle;

step two: the baffle (3) is fixed at the rear part of the fork lug of the folding joint;

step three: slowly unfolding the folding joint into position by a manual folding driver;

step four: checking the coaxiality of the two holes by using the checking pin (2), and determining that the coaxiality is good when the checking pin (2) can be smoothly inserted, so that the requirement of stretching of the transverse pin can be met; when the inspection pin (2) cannot be smoothly inserted, the relative positions of the folding joint and the fixed joint fork lug connecting holes are changed by adjusting the thickness of the gaskets at the relevant bolts;

step five: slowly folding the folding joint to be larger than a preset angle state through a manual folding driver, and dismantling the bushing (1) and the baffle (3);

step six: and performing a rotor folding test.

The invention provides a fixture and a method for checking and fixing coaxiality of a folding mechanism joint, which are simple in structure and convenient to use, and can be used for replacing visual checking, realizing standardized operation of checking coaxiality of a folding joint and a fixed joint fork ear connecting hole, and improving safety and working efficiency of rotor folding operation. Through practical verification, the use and the inspection effect are good.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, the drawings that are needed in the embodiments or the description of the prior art will be briefly described below, it will be obvious that the drawings in the following description are some embodiments of the present invention, and that other drawings can be obtained according to these drawings without inventive effort to a person skilled in the art.

FIG. 1 is a schematic diagram of a coaxiality inspection fixture for a folding mechanism joint of the present invention;

FIG. 2 is a schematic view of a baffle liner according to the present invention;

FIG. 3 is a schematic illustration of the use of the check pin of the present invention;

FIG. 4 is a schematic cross-sectional view of the inspection station of the present invention;

reference numerals illustrate:

1-a bushing;

2-checking pins;

3-baffle.

Detailed Description

The coaxiality inspection fixing tool and the inspection method for the folding mechanism joint provided by the invention are further described below with reference to the accompanying drawings.

As shown in FIG. 1, the solution of the present invention is to provide a fixture and a method for inspecting coaxiality of a joint of a folding mechanism, which replace the manual visual inspection or finger feeling manner, so as to normalize the coaxiality inspection manner of the fixed joint and the fork ear hole of the folding joint.

The coaxiality inspection fixing tool for the folding mechanism joint is shown in fig. 1, and the tool inspection pin 2 is required to be inserted from a small aperture to a large aperture during detection, so that the aperture of the large aperture to be detected is reduced by arranging the bushing 1, and the inspection pin 2 is conveniently inserted and detected.

The outer diameter of the bushing 1 is tightly matched with the inner diameter of the folding joint fork lug hole through the control of a tolerance zone, so that the bushing 1 can be placed in the folding joint fork lug hole and cannot easily slide out. Because the pin hole is non-horizontal, the bush 1 is easy to slip out due to the influence of gravity factors when the folding joint fork ear moves in the folding circumferential direction, so that the part on the machine is extruded and damaged in the folding process, and the baffle 3 with the fixing function is designed, so that the bush 1 is not separated in the folding, unfolding and coaxiality inspection process by using the inspection pin 2.

Exemplary, the inspection method for inspecting the fixing tool by adopting the coaxiality of the joint of the folding mechanism shown in fig. 1 specifically comprises the following steps:

step one: the bushing 1 is placed in the fork lugs of the folding joint in the folding state, the position of the bushing is adjusted so that the edge of the bushing does not protrude out of the holes to be embedded with the bushing, and the bushing cannot easily slide out, so that the fork lugs of the folding joint positioned on the inner side are reduced to ensure smooth insertion of the detection tool, and the detection tool is shown in fig. 2 in detail;

step two: the baffle 3 is fixed at the rear part of the fork lug of the folding joint, so that the fixation is ensured to be firm, and the baffle 3 has the function of preventing the bushing 1 from falling off in the movement process of the folding joint, so that the extrusion damage of the parts on the machine is caused, and the detail is shown in figure 2;

step three: slowly unfolding the folding joint in place through a driver, and observing whether the edges of the baffle plate and the bushing interfere with the fixed joint in the unfolding process or not, if the interference trend is found, stopping immediately;

step four: the coaxiality of the two holes is checked by using the check pin 2, if the check pin can be smoothly inserted, the coaxiality is good, the requirement of stretching and retracting the transverse pin can be met, the detail is shown in fig. 3, and the sectional view of the check state is shown in fig. 4;

step five: if the inspection pin 2 cannot be inserted smoothly, the relative positions of the folding joint and the fixed joint fork lug connecting holes are changed by adjusting the thickness of the gaskets at the relevant bolts;

step six: slowly folding the folding joint by more than 15 degrees through a manual folding driver, and dismantling the bushing 1 and the baffle 3;

step seven: and performing a rotor folding test.

Claims (8)

1. Coaxiality inspection fixing tool for folding mechanism joint is characterized by comprising: a bushing (1), a checking pin (2) and a baffle (3);

the bushing (1) is put into the fork lugs of the folding joint when the folding joint is folded to be larger than a preset angle;

the checking pin (2) is inserted into the fork lug connecting holes of the fixed joint and the folding joint to check coaxiality when the folding joint is unfolded in place;

the baffle (3) is used for fixing the bushing (1) and does not lead the bushing (1) to be separated in the processes of folding, unfolding and using the inspection pin (2) for coaxiality inspection.

2. The tool for checking and fixing the coaxiality of the folding mechanism joint according to claim 1, wherein the edge of the bushing (1) does not protrude out of a hole of a fork ear of the folding mechanism joint, and the bushing is embedded in the hole.

3. The tool for checking and fixing the coaxiality of the folding mechanism joint according to claim 1, wherein the outer diameter of the bushing (1) is matched with the inner diameter of the hole of the folding joint fork ear through a tolerance zone.

4. The tool for checking and fixing the coaxiality of the folding mechanism joint according to claim 1, wherein the inner diameter of the bushing (1) is not larger than the inner diameter of the hole of the fixed joint fork ear.

5. The coaxiality inspection and fixation tool for the folding mechanism joint according to claim 1, wherein the cross section of the baffle (3) is in an inverted J shape and is hung and fixed at the rear part of a fork lug of the folding joint;

a flange is arranged on one side edge of the straight-line section part of the baffle (3), and when the folding joint fork lug is inserted into the fixed joint fork lug, the flange is attached to the U-shaped end face of the fixed joint fork lug.

6. The tool for checking and fixing the coaxiality of the joints of the folding mechanism according to claim 1, wherein the checking pin (2) is cylindrical, one end is a checking end, the other end is a handheld end, and the section of the handheld end is polygonal;

the checking end is a cylinder with the diameter the same as the inner diameter of the lining (1),

or,

the checking end is a stepped cylinder, and the diameters of the two layers of steps are respectively consistent with the inner diameter of the bushing (1) and the inner diameter of the hole of the fixed joint fork lug.

7. The fixture for checking and fixing coaxiality of joints of a folding mechanism according to claim 1, wherein the preset angle is 15 °.

8. An inspection method of an inspection fixture for coaxiality of a joint of a folding mechanism according to any one of claims 1 to 7, comprising:

step one: placing the bushing (1) into the fork lugs of the folding joint when the folding joint is folded by more than a preset angle;

step two: the baffle (3) is fixed at the rear part of the fork lug of the folding joint;

step three: slowly unfolding the folding joint into position by a manual folding driver;

step four: checking the coaxiality of the two holes by using the checking pin (2), and determining that the coaxiality is good when the checking pin (2) can be smoothly inserted, so that the requirement of stretching of the transverse pin can be met; when the inspection pin (2) cannot be smoothly inserted, the relative positions of the folding joint and the fixed joint fork lug connecting holes are changed by adjusting the thickness of the gaskets at the relevant bolts;

step five: slowly folding the folding joint to be larger than a preset angle state through a manual folding driver, and dismantling the bushing (1) and the baffle (3);

step six: and performing a rotor folding test.