Vehicle door hinge coaxiality detection tool and detection method thereof

Abstract

The invention provides a vehicle door hinge coaxiality detection tool. The vehicle door hinge coaxiality detection tool comprises a handle, a first detection rod and a second detection rod, the first detection rod comprises a first pin and a first extension rod, and the second detection rod comprises a second pin and a second extension rod; the handle is provided with a first annular detection frame and a second annular detection frame which are parallel to each other and are provided with detection through holes, the first extension rod extends into the first detection frame, and the second extension rod extends into the second detection frame; when the axis of the first detection rod is collinear with the center line of the first detection frame and the axis of the second detection rod is collinear with the center line of the second detection frame, the axis of the first detection rod is collinear with the axis of the second detection rod. The device has the advantages that the first detection rod and the second detection rod are universally connected and are connected to the handle through the slide rail, so that the first pin and the second pin can incline, and the installation is convenient and fast; the deviation value of the coaxiality is amplified through the extension rod and then quantified through the dial indicator, so that the deviation value and the deviation direction can be measured.

Description

Technical Field

[0001] The invention relates to the technical field of automobile assembly, in particular to a door hinge coaxiality inspection tool and a inspection method thereof. Background Art

[0002] The upper and lower hinges of automobile doors are rigidly connected through the door assembly. Affected by factors such as hinge size, installation fixture accuracy, and door assembly size, the upper and lower hinge axes will have different degrees of misalignment. Therefore, the concept of door hinge coaxiality is introduced to quantify the degree of misalignment of the upper and lower door hinges with a unified standard. Similarly, the body side hinges will also have different degrees of misalignment due to factors such as installation fixtures, parts, and processes. When the cumulative deviation of the two reaches a certain level, the door assembly will not be able to be hung into the body. This is also the most common and important problem caused by coaxiality deviation. Therefore, for vehicle manufacturers, it is very important to analyze, control, and solve the door hinge coaxiality problem. In order to solve the coaxiality problem, it is necessary to detect the coaxiality deviation of the door side and body side hinges.

[0003] At present, in order to detect the coaxiality of the door hinge, a through-type coaxiality gauge is generally used for testing. If the gauge is fully inserted, it is qualified, and if it cannot be fully inserted, it is unqualified. However, the through-type coaxiality gauge can only judge whether it is qualified, but cannot quantify the degree and direction of deviation, making it difficult to guide the formulation of measures and providing a basis for the adjustment of the installation fixture. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides a door hinge coaxiality inspection fixture and a detection method thereof, which magnifies the coaxiality display deviation by extending a rod, and measures the coaxiality deviation value and direction by a dial indicator, providing a basis for adjusting the installation fixture.

[0005] The present invention solves the technical problem by adopting the following technical solution:

[0006] A door hinge coaxiality inspection tool, comprising a handle, a first inspection rod and a second inspection rod; wherein the first inspection rod and the second inspection rod are connected to two ends of the handle through a first universal joint and a second universal joint respectively; the first inspection rod comprises a first pin and a first extension rod respectively located on both sides of the first universal joint, and the first pin is adapted to an upper hinge; the second inspection rod comprises a second pin and a second extension rod located on both sides of the second universal joint, and the second pin is adapted to a lower hinge;

[0007] The handle is provided with a first detection frame and a second detection frame which are parallel to each other, and the first detection frame and the second detection frame are both annular; the first extension rod extends into the first detection frame, and the second extension rod extends into the second detection frame; when the axis of the first detection rod is collinear with the center line of the first detection frame, and the axis of the second detection rod is collinear with the center line of the second detection frame, the axis of the first detection rod is collinear with the axis of the second detection rod;

[0008] The first detection frame and the second detection frame are both provided with detection through holes for inserting a dial indicator.

[0009] Further, the cross-sections of the free ends of the first extension rod and the second extension rod are both circular or square, the cross-sections of the first detection frame and the second detection frame are both circular rings or square rings, and the two adjacent sides of the square extend along the X direction and the Y direction respectively; preferably, the first detection frame is the same as the second detection frame, and the first detection rod is the same as the second detection rod; more preferably, the cross-sections of the free ends of the first extension rod and the second extension rod are both square, the cross-sections of the first detection frame and the second detection frame are both square rings, and the two adjacent sides of the square extend along the X direction and the Y direction respectively, so as to facilitate the measurement of the X-direction deviation and the Y-direction deviation.

[0010] Further, the detection through hole includes an X-direction detection hole and a Y-direction detection hole, the X-direction detection hole extends along the X direction, and the Y-direction detection hole extends along the Y direction, so that the X-direction deviation and the Y-direction deviation can be detected.

[0011] Furthermore, the first pin and the second pin are respectively close to the first end and the second end of the handle, and the first extension rod and the second extension rod extend toward the middle of the handle; the first universal member and / or the second universal member are connected to the handle through a sliding rail, so as to facilitate the first pin and the second pin to be respectively assembled on the upper hinge and the lower hinge.

[0012] Furthermore, the length of the first extension rod is 8-12 times the length of the first pin; the length of the second extension rod is 8-12 times the length of the second pin, which effectively amplifies the deviation between the first pin axis and the second pin axis and facilitates the measurement reading of the dial indicator.

[0013] Furthermore, the first pin and the second pin are configured as pin shafts, and the maximum diameters of the first pin and the second pin are respectively the minimum values ​​of the apertures of the hinge holes of the upper hinge and the lower hinge, and the precisions of the first pin and the second pin are respectively 1 / 10-1 / 3 of the tolerances of the hinge holes of the upper hinge and the lower hinge; the first pin and the second pin are configured as sleeves, and the minimum apertures of the sleeve holes of the first pin and the second pin are respectively the maximum values ​​of the diameters of the hinge shafts of the upper hinge and the lower hinge, and the precisions of the sleeve holes of the first pin and the second pin are respectively 1 / 10-1 / 3 of the tolerances of the hinge holes of the upper hinge and the lower hinge, so that the first pin and the second pin can coincide with the axes of the corresponding hinge holes or hinge shafts, thereby improving the measurement accuracy.

[0014] Furthermore, the inspection tool also includes a dial indicator for detecting the distance between the free end of the first extension rod and the inner wall of the first inspection frame, and the distance between the free end of the second extension rod and the inner wall of the second inspection frame.

[0015] Furthermore, the inspection fixture also includes a calibration block, which has a calibration hole. When the dial indicator is inserted into the calibration hole, the fixed rod of the dial indicator abuts against the outer wall of the calibration block, and the measuring rod abuts against the bottom wall of the calibration hole; when the axis of the first detection rod is collinear with the center line of the first detection frame, and the axis of the second detection rod is collinear with the center line of the second detection frame, the distance from the outer wall of the first detection frame to the first extension rod, and the distance from the outer wall of the second detection frame to the second extension rod are the same as the depth of the calibration hole, thereby improving the accuracy of the measurement.

[0016] Furthermore, the diameter of the calibration hole of the calibration block and the diameter of the detection through hole are both 1.02-1.05 times the diameter of the measuring rod of the dial gauge, and the depth of the detection through hole is 40%-60% of the length of the measuring rod of the dial gauge, thereby improving the calibration precision and measurement accuracy of the dial gauge.

[0017] Furthermore, a method for detecting the coaxiality of a door hinge is provided, using the above-mentioned inspection fixture for detection, and the method comprises the following steps:

[0018] Step 1: Assemble the first pin to the upper hinge and the second pin to the lower hinge;

[0019] Step 2: After calibrating the dial indicator with a standard block, insert the dial indicator into the X-direction detection hole and the Y-direction detection hole of the first detection frame and the second detection frame respectively, and measure the deviations of the first extension rod and the second extension rod, including the X-direction deviation L1x of the first extension rod, the Y-direction deviation L1y of the first extension rod, the X-direction deviation L2x of the second extension rod, and the Y-direction deviation L2y of the second extension rod;

[0020] Step 3, check whether the deviation of the first extension rod and the second extension rod is within the qualified range; if the deviation is within the qualified range, it indicates that the coaxiality of the upper hinge and the lower hinge meets the requirements; if the deviation exceeds the qualified range, calculate the deviation of the first pin and the second pin according to the deviation of the first extension rod and the second extension rod, the ratio of the length of the first extension rod to the length of the first pin, and the ratio of the length of the second extension rod to the length of the second pin, including the X-direction deviation L1x' of the first pin, the Y-direction deviation L1y' of the first pin, the X-direction deviation L2x' of the second pin, and the Y-direction deviation L2y' of the second pin;

[0021] Step 4, adjusting the installation fixture of the corresponding hinge according to the deviation between the first pin and the second pin;

[0022] Step 5. Install the upper hinge and the lower hinge using the adjusted mounting fixture;

[0023] Step 6, return to step 1, until the deviation between the first extension rod and the second extension rod is within the acceptable range.

[0024] Furthermore, the method for adjusting the hinge mounting fixture includes: comparing the X-direction and Y-direction deviation values ​​of the first pin and the second pin respectively; when the X-direction and / or Y-direction deviation values ​​are different, adjusting the mounting fixture of the corresponding hinge in the opposite direction according to 1 / 3-1 / 2 of the larger deviation value in each direction; when the X-direction and / or Y-direction deviation values ​​are the same, adjusting the mounting fixture of the corresponding hinge in the opposite direction according to 1 / 3-1 / 2 of the deviation value in each direction.

[0025] Furthermore, the acceptable range of the deviation between the first extension rod and the second extension rod is 0-1.5 mm.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] (1) The first detection rod and the second detection rod are universally connected so that the first pin and the second pin can be tilted, and the first universal member and / or the second universal member are connected to the handle through a slide rail, so that the first pin and the second pin can be smoothly assembled on the upper hinge and the lower hinge respectively, and coincide with the axis of the corresponding hinge. The installation is convenient and quick, and the upper hinge and the lower hinge can be detected in various deviation states.

[0028] (2) The deviation of the coaxiality of the upper hinge and the lower hinge is amplified by the first extension rod and the second extension rod, and then quantified by the dial indicator to improve the recognition ability of the inspection fixture, thereby measuring the deviation amount and deviation direction of the upper hinge and the lower hinge, providing a basis and guidance for the adjustment of the hinge installation fixture. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1It is a schematic diagram of the structure of the door hinge coaxiality inspection fixture of the present invention.

[0030] Figure 2 It is a schematic diagram of the door hinge coaxiality inspection tool of the present invention when inspecting the deviation state of the upper hinge and the lower hinge axis having an included angle α.

[0031] Figure 3 It is a schematic diagram of the coaxiality inspection tool for door hinges of the present invention detecting a deviation state in which the axes of the upper hinge and the lower hinge are parallel but not coaxial.

[0032] Figure 4 It is a schematic diagram of the AA section of the door hinge coaxiality inspection fixture of the present invention.

[0033] Figure 5 The figure is a schematic diagram of the calibration structure of the calibration block of the door hinge coaxiality inspection fixture of the present invention.

[0034] In the figure: 1-handle; 11-slide rail; 2a-first detection rod; 21a-first pin; 22a-first extension rod; 2b-second detection rod; 21b-second pin; 22b-second extension rod; 3a-first universal joint; 3b-second universal joint; 4a-first detection frame; 4b-second detection frame; 5-detection through hole; 6-dial indicator; 61-fixing rod; 62-measuring rod; 7-calibration block; 71-calibration hole; 100-upper hinge; 200-lower hinge. DETAILED DESCRIPTION

[0035] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments.

[0036] In the description of the present invention, it should be noted that the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In addition, it should be noted that the directions "X", "Y" and "Z" are directions indicated by the coordinate system in the accompanying drawings, which are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention. The term "and / or" when used to list two or more items means that any one of the listed items can be adopted, or any combination of two or more of the listed items can be adopted.

[0037] The present invention provides a door hinge coaxiality inspection tool, such as Figure 1As shown, it includes a handle 1, a first detection rod 2a and a second detection rod 2b; wherein the first detection rod 2a and the second detection rod 2b are respectively connected to the two ends of the handle 1 through a first universal joint 3a and a second universal joint 3b; the first detection rod 2a includes a first pin 21a and a first extension rod 22a respectively located on both sides of the first universal joint 3a, and the first pin 21a is adapted to the upper hinge 100; the second detection rod 2b includes a second pin 21b and a second extension rod 22b located on both sides of the second universal joint 3b, and the second pin 21b is adapted to the lower hinge 200. The handle 1 is provided with a first detection frame 4a and a second detection frame 4b which are parallel to each other, and the first detection frame 4a and the second detection frame 4b are both annular; the first extension rod 22a extends into the first detection frame 4a, and the second extension rod 22b extends into the second detection frame 4b; when the axis of the first detection rod 2a is collinear with the center line of the first detection frame 4a, and the axis of the second detection rod 2b is collinear with the center line of the second detection frame 4b, the axis of the first detection rod 2a is collinear with the axis of the second detection rod 2b. The first detection frame 4a and the second detection frame 4b are both provided with a detection through hole 5 for inserting a dial indicator 6. Preferably, the detection through hole 5 includes an X-direction detection hole and a Y-direction detection hole, the X-direction detection hole extends along the X-direction, and the Y-direction detection hole extends along the Y-direction, so that the X-direction deviation and the Y-direction deviation can be detected.

[0038] Generally, the upper hinge 100 and the lower hinge 200 on the vehicle body side of the door hinge are set as hinge holes, and correspondingly, the first pin 21a and the second pin 21b are set as pin shafts, which are adapted to the hinge holes of the upper hinge 100 and the lower hinge 200, and can be inserted into the upper hinge 100 and the lower hinge 200 respectively. The upper hinge 100 and the lower hinge 200 on the vehicle door side of the door hinge are set as hinge shafts, and correspondingly, the first pin 21a and the second pin 21b are set as sleeves, which are adapted to the hinge shafts of the upper hinge 100 and the lower hinge 200, and can insert the hinge shafts of the upper hinge 100 and the lower hinge 200 into the sleeves respectively. The inspection fixture can be used to measure the deviation state of the upper hinge 100 and the lower hinge 200 axis having an angle α, and can also measure the deviation state of the upper hinge 100 and the lower hinge 200 axis being parallel but not coaxial, that is, the state of having a translational deviation. Taking the vehicle body side hinge as an example, such as Figure 2 As shown, when the upper hinge 100 and the lower hinge 200 have an angle α, the first detection rod 2a and the second detection rod 2b are tilted in different directions by the first universal member 3a and the second universal member 3b, respectively, so that the first pin 21a can be inserted into the upper hinge 100 and the second pin 21b can be inserted into the lower hinge 200. At this time, the axis of the first pin 21a and the axis of the second pin 21b have an angle α, and the deviation of the axis of the first pin 21a and the axis of the second pin 21b is the deviation of the axis of the upper hinge 100 and the lower hinge 200. Figure 3As shown, when the axes of the upper hinge 100 and the lower hinge 200 have a translation deviation, the first detection rod 2a and the second detection rod 2b are tilted in the same direction by the first universal joint 3a and the second universal joint 3b, so that the first detection rod 2a and the second detection rod 2b are roughly parallel, so that the first pin 21a can be inserted into the upper hinge 100 and the second pin 21b can be inserted into the lower hinge 200. At this time, the axis of the first pin 21a and the axis of the second pin 21b are parallel, and the deviation ΔL between the axis of the first pin 21a and the axis of the second pin 21b is the deviation of the axes of the upper hinge 100 and the lower hinge 200. The inspection tool universally connects the first inspection rod 2a and the second inspection rod 2b to the handle 1 through universal parts such as spherical bearings or universal joints, so that the first pin 21a and the second pin 21b retain a small amount of freedom around the X-axis and the Y-axis. When the upper hinge 100 and the lower hinge 200 are not coaxial, the first pin 21a and the second pin 21b can be tilted, and can be smoothly inserted into the upper hinge 100 and the lower hinge 200 respectively, and coincide with the axes of the corresponding hinges. The installation is convenient and quick, and the upper hinge 100 and the lower hinge 200 can be detected in various deviation states.

[0039] Since the coaxiality deviation of the upper hinge 100 and the lower hinge 200 is small in magnitude (generally less than 0.2 mm), it is difficult to measure and indicate the value. Therefore, the first extension rod 22a and the second extension rod 22b are respectively provided on the back of the first pin 21a and the second pin 21b to magnify the coaxiality deviation display. The dial indicator 6 is then used in conjunction with the first detection frame 4a and the second detection frame 4b to measure the displacement deviation of the free end of the extension rod, thereby determining the inclination direction and inclination amount of the axis of the upper hinge 100 and the lower hinge 200, thereby providing a basis and guidance for the adjustment of the hinge mounting fixture.

[0040] In some embodiments, the cross-sections of the free ends of the first extension rod 22a and the free ends of the second extension rod 22b are both circular or square, the cross-sections of the first detection frame 4a and the second detection frame 4b are both circular or square, and the two adjacent sides of the square extend in the X direction and the Y direction respectively. The center line of the first detection frame 4a is collinear with the center line of the second detection frame 4b. When the axis of the first detection rod 2a is collinear with the axis of the second detection rod 2b, the first extension rod 22a is located at the center of the first detection frame 4a, and the X-direction distance and the Y-direction distance between the first extension rod 22a and the inner wall of the first detection frame 4a are the same; when the second extension rod 22b is located at the center of the second detection frame 4b, the X-direction distance and the Y-direction distance between the second extension rod 22b and the inner wall of the second detection frame 4b are the same. The hinge holes of the upper hinge 100 and the lower hinge 200 have the same size. Preferably, the first detection frame 4a is the same as the second detection frame 4b, and the first detection rod 2a is the same as the second detection rod 2b. The center line of the first detection frame 4a and the center line of the second detection frame 4b are collinear. When the first extension rod 22a is located at the center of the first detection frame 4a and the second extension rod 22b is located at the center of the second detection frame 4b, the X-direction distance between the first extension rod 22a and the inner wall of the first detection frame 4a, the Y-direction distance between the first extension rod 22a and the inner wall of the first detection frame 4a, the X-direction distance between the second extension rod 22b and the inner wall of the second detection frame 4b, and the Y-direction distance between the second extension rod 22b and the inner wall of the second detection frame 4b are all the same, so it is convenient to use a dial indicator 6 to measure the X-direction deviation and the Y-direction deviation.

[0041] More preferably, the cross-sections of the free ends of the first extension rod 22a and the second extension rod 22b are both square, the cross-sections of the first detection frame 4a and the second detection frame 4b are both square rings, and the two adjacent sides of the square extend along the X direction and the Y direction respectively, so that the deviation direction is easier to observe according to the inclination direction of the extension rod.

[0042] In order to reduce the length and weight of the gauge and facilitate carrying, the first pin 21a and the second pin 21b are respectively arranged at the first end and the second end close to the handle 1, and the first extension rod 22a and the second extension rod 22b extend toward the middle of the handle 1. When using the gauge, it is necessary to move the first pin 21a upward to be assembled on the upper hinge 100, and the second pin 21b is moved downward to be assembled on the lower hinge 200. After installation, the distance between the free end of the first pin 21a and the free end of the second pin 21b is greater than the distance between the upper hinge 100 and the lower hinge 200 (the distance between the upper hinge 100 and the lower hinge 200 is the distance between the lower end surface of the upper hinge 100 and the upper end surface of the lower hinge 200). In order to facilitate the assembly of the first pin 21a and the second pin 21b on the upper hinge 100 and the lower hinge 200, respectively, the first universal member 3a and / or the second universal member 3b are connected to the handle 1 through the slide rail 11 and can run along the Z direction. Assuming that the first universal member 3a is directly fixed to the handle 1, and the second universal member 3b is connected to the handle 1 through the slide rail 11, taking the vehicle body side hinge as an example, when in use, first insert the first pin 21a into the upper hinge 100, and then adjust the position of the second pin 21b through the slide rail 11 so that the second pin 21b is located in the space between the upper and lower hinges 200, and then pull the handle 1 or pull the second detection rod 2b to move the second pin 21b downward and insert it into the lower hinge 200. The distance between the free end of the first pin 21a and the free end of the second pin 21b is controlled by the slide rail 11, and the operation is convenient and quick.

[0043] In some embodiments, the length of the first extension rod 22a is 8-12 times the length of the first pin 21a; the length of the second extension rod 22b is 8-12 times the length of the second pin 21b, which can effectively magnify the deviation between the axis of the first pin 21a and the axis of the second pin 21b, facilitate the measurement of the readings by the dial indicator 6, and allow a spacing between the free ends of the first extension rod 22a and the second extension rod 22b to avoid interference between the second detection rod 2b and the first detection rod 2a when the second detection rod 2b moves along the slide rail 11.

[0044] When the upper hinge 100 and the lower hinge 200 on the vehicle body side of the door hinge are set as hinge holes, and the drawings require that the hinge hole size has a maximum value and a minimum value, accordingly, the first pin 21a and the second pin 21b are set as pin shafts, and the size of the first pin 21a and the second pin 21b cannot be larger than the hinge hole size. If it is larger than the hinge hole size, the pin shaft cannot be inserted into the hinge hole. At the same time, it cannot be too small. If it is too small, it cannot be guaranteed that the first pin 21a and the second pin 21b coincide with the axis of the corresponding hinge hole, and the probability of the hinge hole diameter of the upper hinge 100 and the lower hinge 200 being the minimum value is extremely low. Therefore, the maximum diameters of the first pin 21a and the second pin 21b are the minimum values ​​of the hinge hole diameters of the upper hinge 100 and the lower hinge 200, respectively, and the accuracy of the first pin 21a and the second pin 21b are 1 / 10-1 / 3 of the hinge hole tolerances of the upper hinge 100 and the lower hinge 200, respectively. For example, the drawing requires that the hinge hole size of the upper hinge 100 and the lower hinge 200 is 10.04-10.13mm, with a tolerance of 0.09mm. The maximum diameter of the first pin 21a and the second pin 21b is the minimum value of the hinge hole diameter 10.04mm. If the accuracy is 1 / 10 of the hinge hole tolerance, the diameter of the first pin 21a and the second pin 21b is 10.031-10.04mm.

[0045] When the upper hinge 100 and the lower hinge 200 on the door side of the door hinge are set as hinge shafts, and the drawings require that the hinge shaft size has a maximum value and a minimum value, accordingly, the first pin 21a and the second pin 21b are set as sleeves, and the sleeve size of the first pin 21a and the second pin 21b cannot be smaller than the hinge shaft size. If it is smaller than the hinge shaft size, the hinge shaft cannot be inserted into the sleeve hole. At the same time, it cannot be too large. If it is too large, it cannot be guaranteed that the first pin 21a and the second pin 21b coincide with the axis of the corresponding hinge shaft, and the probability of the hinge shaft diameter of the upper hinge 100 and the lower hinge 200 being the maximum value is extremely low. Therefore, the minimum aperture of the sleeve hole of the first pin 21a and the second pin 21b is the maximum value of the hinge shaft diameter of the upper hinge 100 and the lower hinge 200, respectively, and the sleeve hole accuracy of the first pin 21a and the second pin 21b is 1 / 10-1 / 3 of the hinge hole tolerance of the upper hinge 100 and the lower hinge 200, respectively. For example, the drawing requires that the hinge shaft size of the upper hinge 100 and the lower hinge 200 is 10.04-10.13mm, with a tolerance of 0.09mm, and the minimum diameter of the sleeve hole of the first pin 21a and the second pin 21b is the maximum value of the hinge shaft diameter of 10.13mm. If the accuracy is 1 / 10 of the hinge shaft tolerance, the hole diameter of the sleeve of the first pin 21a and the second pin 21b is 10.13-10.139mm.

[0046] The inspection tool also includes a dial indicator 6 for detecting the distance between the free end of the first extension rod 22a and the inner wall of the first inspection frame 4a, and the distance between the free end of the second extension rod 22b and the inner wall of the second inspection frame 4b. The size of the first inspection frame 4a and the size of the first extension rod 22a enable the dial indicator 6 to be inserted into the inspection through hole 5 of the first inspection frame 4a, and when the fixed rod 61 abuts against the outer wall of the first inspection frame 4a, the measuring rod 62 can abut against the first extension rod 22a; the size of the second inspection frame 4b and the size of the second extension rod 22b enable the dial indicator 6 to be inserted into the inspection through hole 5 of the second inspection frame 4b, and when the fixed rod 61 abuts against the outer wall of the second inspection frame 4b, the measuring rod 62 can abut against the second extension rod 22b, and the dial indicator 6 can effectively and accurately measure the distance between the free end of the first extension rod 22a and the inner wall of the first inspection frame 4a, and the distance between the free end of the second extension rod 22b and the inner wall of the second inspection frame 4b.

[0047] The inspection fixture also includes a calibration block 7, which has a calibration hole 71. When the dial indicator 6 is inserted into the calibration hole 71, the fixing rod 61 of the dial indicator 6 abuts against the outer wall of the calibration block 7, and the measuring rod 62 abuts against the bottom wall of the calibration hole 71; when the axis of the first detection rod 2a is collinear with the center line of the first detection frame 4a, and the axis of the second detection rod 2b is collinear with the center line of the second detection frame 4b, the distance from the outer wall of the first detection frame 4a to the first extension rod 22a, and the distance from the outer wall of the second detection frame 4b to the second extension rod 22b are the same as the depth of the calibration hole 71.

[0048] refer to Figure 4 and Figure 5As shown, after the dial gauge 6 is inserted into the calibration hole 71, the dial gauge 6 is reset to zero, and the calibration of the dial gauge 6 is completed. At this time, the length of the measuring rod 62 of the dial gauge 6 is the depth L0 of the calibration hole 71. The dial gauge 6 is inserted into the detection through hole 5, and the length of the measuring rod 62 of the dial gauge 6 is the distance L1 from the outer wall of the first detection frame 4a to the first extension rod 22a, and the distance L1 from the outer wall of the second detection frame 4b to the second extension rod 22b. When the axis of the first detection rod 2a is collinear with the center line of the first detection frame 4a, and the axis of the second detection rod 2b is collinear with the axis of the second detection frame 4b, that is, the axis of the first detection rod 2a is collinear (coaxial) with the axis of the second detection rod 2b, the reading of the dial gauge 6 is zero; conversely, when the reading of the dial gauge 6 is zero, it indicates that the axis of the first detection rod 2a is collinear with the center line of the first detection frame 4a, and the axis of the second detection rod 2b is collinear with the axis of the second detection frame 4b. The measured values ​​of the dial indicator 6 are the deviation of the axis of the first detection rod 2a relative to the center line of the first detection frame 4a, and the deviation of the axis of the second detection rod 2b relative to the center line of the second detection frame 4b. After adjusting the hinge installation fixture according to the measured values ​​of the dial indicator 6, the axis of the first detection rod 2a is collinear with the axis of the first detection frame 4a, and the axis of the second detection rod 2b is collinear with the axis of the second detection frame 4b. This allows the axis of the first detection rod 2a to be collinear with the axis of the second detection rod 2b, i.e., the axis of the upper hinge 100 and the lower hinge 200 are coaxial. Since the axis deviation of the upper hinge 100 and the lower hinge 200 is small, the accuracy of the measurement can be improved by calibrating the dial indicator 6 to zero with the calibration block 7 before measuring. It is understandable that the dial indicator 6 can be adjusted so that when the reading of the dial indicator 6 returns to zero, the measuring rod 62 has an initial measuring pressure. When the distance between the outer wall of the detection frame and the extension rod increases, the measuring rod 62 of the dial indicator 6 can still be against the extension rod, and the measuring rod 62 can still be subjected to the measuring pressure, so that the dial indicator 6 displays the reading normally.

[0049] In order to improve the calibration precision and measurement accuracy of the dial indicator 6, the measuring rod 62 of the dial indicator 6 can be inserted into the calibration hole 71 and the detection through hole 5 parallel to the axis of the hole or coincident with the axis of the hole to prevent the measuring rod 62 from being skewed. Preferably, the diameter of the calibration hole 71 of the calibration block 7 and the diameter of the detection through hole 5 are both 1.02-1.05 times the diameter of the measuring rod 62 of the dial indicator 6, and the depth of the detection through hole 5 is 40%-60% of the length of the measuring rod 62 of the dial indicator 6.

[0050] The present invention also provides a method for detecting the coaxiality of a door hinge, using the above-mentioned inspection tool for detection, and the method comprises the following steps:

[0051] Step 1: Assemble the first pin 21a to the upper hinge 100 and the second pin 21b to the lower hinge 200;

[0052] Step 2, after calibrating the dial gauge 6 with a standard block, insert the dial gauge 6 into the X-direction detection hole and the Y-direction detection hole of the first detection frame 4a and the second detection frame 4b, respectively, and measure the deviations of the first extension rod 22a and the second extension rod 22b, including the X-direction deviation L1x of the first extension rod 22a, the Y-direction deviation L1y of the first extension rod 22a, the X-direction deviation L2x of the second extension rod 22b, and the Y-direction deviation L2y of the second extension rod 22b;

[0053] Step 3, check whether the deviation of the first extension rod 22a and the second extension rod 22b is within the qualified range; if the deviation is within the qualified range, it indicates that the coaxiality of the upper hinge 100 and the lower hinge 200 meets the requirements; if the deviation exceeds the qualified range, the deviation of the first pin 21a and the second pin 21b is calculated according to the deviation of the first extension rod 22a and the second extension rod 22b, the ratio of the length of the first extension rod 22a to the length of the first pin 21a, and the ratio of the length of the second extension rod 22b to the length of the second pin 21b, including the X-direction deviation L1x′ of the first pin 21a, the Y-direction deviation L1y′ of the first pin 21a, the X-direction deviation L2x′ of the second pin 21b, and the Y-direction deviation L2y′ of the second pin 21b;

[0054] Step 4, adjusting the installation fixture of the corresponding hinge according to the deviation between the first pin 21a and the second pin 21b;

[0055] Step 5: Use the adjusted installation fixture to install the upper hinge 100 and the lower hinge 200;

[0056] Step 6, return to step 1, until the deviation between the first extension rod 22a and the second extension rod 22b is within the acceptable range.

[0057] When installing the inspection fixture, slightly rotate the first universal member 3a to assemble the first pin 21a to the upper hinge 100, then move the second universal member 3b along the slide rail 11 to the middle of the handle 1, slightly rotate the second universal member 3b, and assemble the second pin 21b to the lower hinge 200. The installation is convenient and quick.

[0058] Specifically, the method for adjusting the hinge mounting fixture includes: comparing the X-direction and Y-direction deviation values ​​of the first pin 21a and the second pin 21b respectively; when the X-direction and / or Y-direction deviation values ​​are different, adjusting the mounting fixture of the corresponding hinge in the opposite direction according to 1 / 3-1 / 2 of the larger deviation value in each direction; when the X-direction and / or Y-direction deviation values ​​are the same, adjusting the mounting fixture of the corresponding hinge in the opposite direction according to 1 / 3-1 / 2 of the deviation value in each direction.

[0059] In actual production, it is difficult to achieve a completely zero-clearance fit for the positioning pins or positioning blocks of the installation fixture. In some special areas, the positioning surfaces are made of materials such as nylon and polyurethane with lower hardness. If the hinge installation fixture is adjusted according to the deviation measured by dial gauge 6, it is easy to cause the adjustment amount to be not proportional to the actual effect after adjustment. On the other hand, a large adjustment of the installation fixture is prone to over-adjustment, which has the risk of causing functional problems in the installation fixture and affecting production. Therefore, in order to reduce production risks, the installation fixture can be adjusted in steps according to 1 / 3-1 / 2 of the deviation measured by dial gauge 6.

[0060] For example, the ratio of the length of the first extension rod 22a to the length of the first pin 21a and the ratio of the length of the second extension rod 22b to the length of the second pin 21b are 10. Through the detection of the dial indicator 6, it is found that the X-direction deviation L1x of the first extension rod 22a is -2mm, and the Y-direction deviation L1y is +3mm, the X-direction deviation L2x of the second extension rod 22b is +2mm, and the Y-direction deviation L2y is -4mm; according to the similar triangle determination theorem, the X-direction deviation L1x′ of the first pin 21a is +0.2mm, and the Y-direction deviation L1y′ is -0.3mm, the X-direction deviation L2x′ of the second pin 21b is -0.2mm, and the Y-direction deviation L2y′ is +0.4mm; indicating that the upper hinge 100 is offset by 0.2mm in the +X direction and 0.3mm in the -Y direction, and the lower hinge 200 is offset by 0.2mm in the -X direction and 0.4mm in the +Y direction. The X-direction deviation value of the first pin 21a is the same as the X-direction deviation value of the second pin 21b, and the Y-direction deviation value of the second pin 21b is greater than the Y-direction deviation value of the first pin 21a. If the hinge mounting fixture is adjusted according to 1 / 2 of the deviation measured by the dial indicator 6, it is necessary to adjust the mounting fixture of the upper hinge 100 by 0.1mm along the -X direction, adjust the mounting fixture of the lower hinge 200 by 0.1mm along the +X direction, and adjust the mounting fixture of the lower hinge 200 by 0.2mm along the -Y direction. After adjusting the hinge installation fixture, install the upper hinge 100 and the lower hinge 200, and perform steps 1 and 2 again, detect the deviation of the first extension rod 22a and the second extension rod 22b, and determine whether the deviation is within the qualified range. If it is within the qualified range, it means that the hinge installation fixture is adjusted to be qualified, and the coaxiality of the upper hinge 100 and the lower hinge 200 installed using the installation fixture meets the requirements; if the deviation exceeds the qualified range, it is necessary to readjust the hinge installation fixture until the deviation of the first extension rod 22a and the second extension rod 22b is within the qualified range. Since the coaxiality deviation of the upper hinge 100 and the lower hinge 200 is generally required to be less than 0.2mm, in order to make the coaxiality deviation of the upper hinge 100 and the lower hinge 200 installed using the adjusted installation fixture within the required range, preferably, the qualified range of the deviation of the first extension rod 22a and the second extension rod 22b is 0-1.5mm. For example, the qualified range of the deviation of the first extension rod 22a and the second extension rod 22b can be set to 0, indicating that the upper hinge 100 and the lower hinge 200 are qualified when they are completely coaxial, or it can be set to 0.2mm, 0.5mm, 0.8mm, 1mm, 1.2mm, 1.5mm, etc.

[0061] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A door hinge coaxiality inspection tool, characterized in that: The invention comprises a handle, a first detection rod and a second detection rod; wherein the first detection rod and the second detection rod are connected to two ends of the handle through a first universal joint and a second universal joint respectively; the first detection rod comprises a first pin and a first extension rod respectively located on both sides of the first universal joint, and the first pin is adapted to the upper hinge; the second detection rod comprises a second pin and a second extension rod located on both sides of the second universal joint, and the second pin is adapted to the lower hinge; The handle is provided with a first detection frame and a second detection frame which are parallel to each other, and the first detection frame and the second detection frame are both annular; the first extension rod extends into the first detection frame, and the second extension rod extends into the second detection frame; when the axis of the first detection rod is collinear with the center line of the first detection frame, and the axis of the second detection rod is collinear with the center line of the second detection frame, the axis of the first detection rod is collinear with the axis of the second detection rod; The first detection frame and the second detection frame are both provided with detection through holes for inserting a dial indicator.

2. The door hinge coaxiality inspection fixture according to claim 1, characterized in that: The cross-sections of the free ends of the first extension rod and the second extension rod are both circular or square, the cross-sections of the first detection frame and the second detection frame are both circular rings or square rings, and the two adjacent sides of the squares extend along the X direction and the Y direction respectively; preferably, the first detection frame is the same as the second detection frame, and the first detection rod is the same as the second detection rod; more preferably, the cross-sections of the free ends of the first extension rod and the second extension rod are both square, the cross-sections of the first detection frame and the second detection frame are both square rings, and the two adjacent sides of the squares extend along the X direction and the Y direction respectively.

3. The door hinge coaxiality inspection fixture according to claim 2, characterized in that: The detection through hole comprises an X-direction detection hole and a Y-direction detection hole, wherein the X-direction detection hole extends along the X direction, and the Y-direction detection hole extends along the Y direction.

4. The door hinge coaxiality inspection tool according to claim 1, characterized in that: The first pin and the second pin are respectively close to the first end and the second end of the handle, and the first extension rod and the second extension rod extend toward the middle of the handle; the first universal member and / or the second universal member are connected to the handle via a slide rail.

5. The door hinge coaxiality inspection tool according to claim 1, characterized in that: The length of the first extension rod is 8-12 times the length of the first pin; the length of the second extension rod is 8-12 times the length of the second pin.

6. The door hinge coaxiality inspection tool according to claim 1, characterized in that: The first pin and the second pin are arranged as pin shafts, and the maximum diameters of the first pin and the second pin are respectively the minimum values ​​of the apertures of the hinge holes of the upper hinge and the lower hinge, and the precisions of the first pin and the second pin are respectively 1 / 10-1 / 3 of the tolerances of the hinge holes of the upper hinge and the lower hinge; the first pin and the second pin are arranged as sleeves, and the minimum apertures of the sleeve holes of the first pin and the second pin are respectively the maximum values ​​of the diameters of the hinge shafts of the upper hinge and the lower hinge, and the precisions of the sleeve holes of the first pin and the second pin are respectively 1 / 10-1 / 3 of the tolerances of the hinge holes of the upper hinge and the lower hinge.

7. The door hinge coaxiality inspection tool according to any one of claims 1 to 6, characterized in that: The inspection tool also includes a dial indicator for detecting the distance between the free end of the first extension rod and the inner wall of the first inspection frame, and the distance between the free end of the second extension rod and the inner wall of the second inspection frame.

8. The door hinge coaxiality inspection tool according to claim 7, characterized in that: The inspection fixture also includes a calibration block, which has a calibration hole. When the dial indicator is inserted into the calibration hole, the fixed rod of the dial indicator abuts against the outer wall of the calibration block, and the measuring rod abuts against the bottom wall of the calibration hole; when the axis of the first detection rod is collinear with the center line of the first detection frame, and the axis of the second detection rod is collinear with the center line of the second detection frame, the distance from the outer wall of the first detection frame to the first extension rod, and the distance from the outer wall of the second detection frame to the second extension rod are the same as the depth of the calibration hole.

9. The door hinge coaxiality inspection tool according to claim 8, characterized in that: The diameter of the calibration hole of the calibration block and the diameter of the detection through hole are both 1.02-1.05 times the diameter of the measuring rod of the dial gauge, and the depth of the detection through hole is 40%-60% of the length of the measuring rod of the dial gauge.

10. A method for detecting the coaxiality of a door hinge, characterized in that: The detection is performed using the detection tool described in claim 8 or 9, and the method comprises the following steps: Step 1: Assemble the first pin to the upper hinge and the second pin to the lower hinge; Step 2: After calibrating the dial indicator with a standard block, insert the dial indicator into the X-direction detection hole and the Y-direction detection hole of the first detection frame and the second detection frame respectively, and measure the deviations of the first extension rod and the second extension rod, including the X-direction deviation L1x of the first extension rod, the Y-direction deviation L1y of the first extension rod, the X-direction deviation L2x of the second extension rod, and the Y-direction deviation L2y of the second extension rod; Step 3, check whether the deviation of the first extension rod and the second extension rod is within the qualified range; if the deviation is within the qualified range, it indicates that the coaxiality of the upper hinge and the lower hinge meets the requirements; if the deviation exceeds the qualified range, calculate the deviation of the first pin and the second pin according to the deviation of the first extension rod and the second extension rod, the ratio of the length of the first extension rod to the length of the first pin, and the ratio of the length of the second extension rod to the length of the second pin, including the X-direction deviation L1x' of the first pin, the Y-direction deviation L1y' of the first pin, the X-direction deviation L2x' of the second pin, and the Y-direction deviation L2y' of the second pin; Step 4, adjusting the installation fixture of the corresponding hinge according to the deviation between the first pin and the second pin; Step 5. Install the upper hinge and the lower hinge using the adjusted mounting fixture; Step 6, return to step 1, until the deviation between the first extension rod and the second extension rod is within the acceptable range.

11. The door hinge coaxiality detection method according to claim 10, characterized in that: The method for adjusting the hinge installation fixture includes: comparing the X-direction and Y-direction deviation values ​​of the first pin and the second pin respectively, and when the X-direction and / or Y-direction deviation values ​​are different, adjusting the corresponding hinge installation fixture in the opposite direction along the corresponding direction according to 1 / 3-1 / 2 of the larger deviation value in each direction; when the X-direction and / or Y-direction deviation values ​​are the same, adjusting the corresponding hinge installation fixture in the opposite direction along the corresponding direction according to 1 / 3-1 / 2 of the deviation value in each direction.

12. The door hinge coaxiality detection method according to claim 10, characterized in that: The acceptable range of the deviation between the first extension rod and the second extension rod is 0-1.5 mm.

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