Portable tool and method for measuring outer diameter of small end face of cone frustum holder

Abstract

The invention relates to the technical field of holder processing, and discloses a portable cone frustum holder small end face outer diameter measuring tool and method.The portable cone frustum holder small end face outer diameter measuring tool comprises two sets of positioning tools, each positioning tool comprises a horizontal rod and a side rod, and the top end of each side rod is rotationally connected with the rear end of the corresponding horizontal rod; the width of the side rod is the same as that of the horizontal rod, a rotating connection point is located in the middle of the width direction of the side rod and the horizontal rod, and a locking piece after the abutting state is completed is arranged between the side rod and the horizontal rod; the front ends of the two groups of horizontal rods are connected with a digital caliper to obtain the distance between the front ends of the two groups of horizontal rods; calculating the distance from the front end of the horizontal rod to the edge of the small end face of the cone-frustum-shaped retainer according to the side inclination angle of the cone-frustum-shaped retainer so as to obtain the outer diameter; the external diameter of the small end face of the cone frustum holder can be quickly measured by using a positioning tool, a digital caliper and an inclinometer, the holder does not need to be taken down from a mold during measurement, direct measurement can be realized, and the structures are small in occupied volume, convenient to carry and simple in measurement process, and the working efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of cage dimension detection, in particular to a portable measuring tool and method for the outer diameter of the small end face of a conical frustum cage. Background Art

[0002] During the production process of a conical frustum bearing cage, it is necessary to detect its dimensions, especially the outer diameter of the top (small end) table end face of the conical frustum cage. In the prior art, the outer diameter of the top (small end) table end face of the conical frustum cage is generally detected by a coordinate measuring machine. However, this measurement method using a coordinate measuring machine requires software operation and has high requirements for operators. Since the conical frustum cage is processed by a mold during production, to measure its small end outer diameter with a coordinate measuring machine, it is necessary to first remove the conical frustum cage from the mold on the workbench and then use the coordinate measuring machine to measure.

[0003] The above measurement method using a coordinate measuring machine for the small end outer diameter of the conical frustum cage has the following problems:

[0004] On the one hand, it is necessary for workers to repeatedly remove and replace the conical frustum cage from the mold, which is inconvenient to operate and cannot realize the detection of its small end outer diameter without moving the measuring tool.

[0005] On the other hand, the coordinate measuring machine occupies a large volume and is not convenient to carry or arrange in some occasions, and cannot detect the small end outer diameter of the conical frustum cage conveniently and quickly. Summary of the Invention

[0006] Aiming at the deficiencies of the prior art, the purpose of the present invention is to provide a portable measuring tool and method for the outer diameter of the small end face of a conical frustum cage. By using a positioning tool, a digital display caliper, and an inclinometer, the outer diameter of the small end face of the conical frustum cage can be quickly measured, and the cage does not need to be removed from the mold during measurement and can be directly measured. Compared with the measurement method using a coordinate measuring machine, these structures occupy a small volume, are convenient to carry, the measurement process is simple, and the work efficiency is improved.

[0007] To achieve the above purpose, the present invention is realized through the following technical solutions:

[0008] In a first aspect, a portable measuring tool for the outer diameter of the small end face of a conical retainer includes two sets of positioning tools. Each positioning tool includes a horizontal rod and a side rod. The top end of the side rod is rotatably connected to the rear end of the horizontal rod. The side rod is used to abut against the side of the conical retainer, and the horizontal rod is used to abut against the top surface of the conical retainer. The side rod and the horizontal rod have the same width, and the rotation connection point is located at the middle position in the width direction of the side rod and the horizontal rod. A locking member is provided between the side rod and the horizontal rod to lock the positioning state of the positioning tool after the abutting state is completed. The front ends of the two horizontal rods are used to connect the fixed end and the digital display sliding end of a digital caliper to obtain the distance between the front ends of the two horizontal rods as the initial measurement value. Then, according to the inclination angle of the side of the conical retainer, the distance from the front end of the horizontal rod to the edge of the small end face of the conical retainer is calculated as the compensation data value, so as to obtain the outer diameter size.

[0009] As a further implementation, a measuring positioning block is provided at the top position of the front end of the horizontal rod. The rear end of the horizontal rod is grooved and provided with a first pin hole for hinging with the side rod.

[0010] As a further implementation, clamping blocks are provided at the bottom ends of the fixed end and the digital display sliding end of the digital caliper. A groove is provided at the bottom surface of the clamping block, and a tightening member is provided on the side of the clamping block. The clamping block is sleeved on the positioning block through the groove and the positioning block is tightened by the tightening member so that the distance between the front ends of the two horizontal rods is directly displayed on the display screen of the digital display sliding end.

[0011] As a further implementation, the rear end of the horizontal rod is grooved to form side plates on the front and rear sides. Corresponding first pin holes are provided at the top end of the side rod and on the side plates to cooperate with a pin shaft.

[0012] As a further implementation, the locking member includes a locking block. One end of the locking block is hinged to the side rod near the top end, and the other end is provided with an oblong hole. A threaded hole is provided at the rear side of the first pin hole on the side plate, and a fixing member passes through the oblong hole and cooperates with the threaded hole to fix the relative positions of the side rod and the horizontal rod.

[0013] As a further implementation, a torsion spring is provided at the pin shaft connecting the top end of the side rod and the rear end of the horizontal rod. The torsion spring makes the side rod have a tendency to rotate along the position of the pin shaft and approach the horizontal rod.

[0014] As a further implementation, a limiting plate is provided at the top surface position near the front end of the horizontal rod. The limiting plate has a set thickness and is used to abut against the side rod so that the side rod contracts into the horizontal rod under the action of the torsion spring. A stepped structure is provided on the inner side surface of the bottom end of the side rod, and the size of the stepped structure is adapted to the thickness of the limiting plate.

[0015] As a further implementation, the inclination angle of the side of the conical retainer can be measured by an inclinometer.

[0016] As a further implementation method, let the inclination angle be α, the width of the rod be 2R, the horizontal distance between the vertical line where the rotation connection point is located and the edge of the conical frustum cage be L, and the compensation data value be the horizontal distance from the front end of the horizontal rod to the rotation connection point minus L. L = R(1 - cosα) / sinα; the sum of the initial data value and twice the compensation data value is the outer diameter to be measured.

[0017] In a second aspect, a method for measuring the outer diameter of the end face of a portable conical frustum includes using the outer diameter measuring tooling described above, and comprises the following steps:

[0018] The side rods of the two groups of positioning tools abut against the side of the conical frustum cage, and the horizontal rods abut against the top surface of the conical frustum cage. The front ends of the two groups of horizontal rods are fixedly connected to the fixed end and the digital display sliding end of the digital caliper. Adjust the positions of the two groups of positioning tools on the same diameter line of the conical frustum cage, and measure the data at multiple points and take the maximum value as the initial measurement value; then calculate the compensation data value according to the side inclination angle to obtain the outer diameter data to be measured.

[0019] The beneficial effects of the present invention are as follows:

[0020] 1. The present invention can quickly measure the outer diameter of the small end face of the conical frustum cage by using the positioning tool, digital caliper and inclinometer, and there is no need to remove the cage from the mold during measurement, and it can be directly measured; compared with the measurement method using a coordinate measuring machine, these structures occupy a small volume, are convenient to carry, the measurement process is simple, and the work efficiency is improved.

[0021] 2. A snap ring is provided at the rotation connection point of the horizontal rod and the side rod of the present invention, so that the side rod can be retracted inside the horizontal rod when not in use. When in use, the side rod is opened and abuts against the side of the conical frustum cage, and the snap ring can make the side rod always tightly abut against the side of the conical frustum cage to ensure the accuracy of the measurement data; when not in use, the positioning tool can be retracted into a rod-shaped structure, which is convenient to carry.

[0022] 3. The locking block of the present invention can lock the relative positions of the side rod and the horizontal rod after they are in place to ensure the accuracy of the measurement data. The setting of the oblong hole can realize the adjustment of the angle between the horizontal rod and the side rod during measurement. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings forming a part of this specification are used to provide a further understanding of the present invention. The schematic embodiments and descriptions of the present invention are used to explain the present invention and do not constitute an improper limitation of the present invention.

[0024] Figure 1 It is a schematic structural diagram of the outer diameter measuring tooling for the small end face of the conical frustum cage in Embodiment 1 of the present invention;

[0025] Figure 2It is an axonometric structure diagram of the measuring tool for the outer diameter of the small end face of the conical retainer in Embodiment 1 of the present invention;

[0026] Figure 3 It is a schematic diagram of the reading state of the measuring tool for the outer diameter of the small end face of the conical retainer in Embodiment 1 of the present invention;

[0027] Figure 4 It is a structure diagram when the measuring tool for the outer diameter of the small end face of the conical retainer in Embodiment 2 of the present invention is unfolded;

[0028] Figure 5 It is a structure diagram when the measuring tool for the outer diameter of the small end face of the conical retainer in Embodiment 2 of the present invention is folded up;

[0029] Figure 6 It is a top view when the measuring tool for the outer diameter of the small end face of the conical retainer in Embodiment 2 of the present invention is folded up;

[0030] Figure 7 It is a schematic diagram of the calculation principle of the compensation amount for the small end outer diameter in Embodiment 1 and Embodiment 2 of the present invention;

[0031] Figure 8 It is a schematic diagram of the reading state of the digital caliper in Embodiment 1 and Embodiment 2 of the present invention.

[0032] In the figure: The distances or dimensions between each part are exaggerated for showing the positions of each part, and the schematic diagram is only for illustration.

[0033] Wherein: 1. Horizontal rod, 2. Side rod, 3. Locking block, 4. Measuring positioning block, 6. Torsion spring, 61. Pin shaft, 7. Long slot, 71. Limiting plate, 11. Groove, 12. Side plate, 13. First pin hole, 14. Second pin hole, 15. Long circular hole, 16. Threaded hole, 17. Front end of the horizontal rod; 101. Mold, 102. Conical retainer; 51. Block, 52. Tightening member, 53. Scale, 54. Fixed end, 55. Digital display sliding end, 56. Display screen. Detailed implementation mode

[0034] It should be noted that the following detailed description is exemplary and is intended to provide further illustration of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present invention belongs.

[0035] Embodiment 1

[0036] In a typical implementation manner of the present invention, refer to Figures 1-3As shown in the figure, a portable measuring tool for the outer diameter of the small end face of a conical cage includes two sets of positioning tools. The positioning tools include a horizontal rod 1 and a side rod 2. The two horizontal rods 1 are used to connect the same digital caliper. The two sets of positioning tools are clamped at the edge of the small end face of the conical cage 102, and the initial data value can be read. According to the inclination angle of the conical cage 102, the compensation data value can be calculated, and then the outer diameter size to be measured can be obtained.

[0037] The structures of the two sets of positioning tools are the same, including a horizontal rod 1, a side rod 2, a locking block 3, and a measuring positioning block 4. The two sets of positioning tools are arranged oppositely, and the measuring positioning block 4 is located at the front top surface position of the horizontal rod 1. The top end of the side rod 2 is rotatably connected to the rear end position of the horizontal rod 1.

[0038] As Figure 1 and Figure 2 shown, a slot 11 is provided at the rear end position of the horizontal rod 1, and a first pin hole 13 is provided for hinging with the side rod 2. The slot 11 is provided at the rear end position of the horizontal rod 1 to form side plates 12 on the front and rear sides. The first pin hole 13 is provided on the side plate 12. The top end of the side rod 2 is correspondingly provided with a first pin hole 13. The top end of the horizontal rod extends between the two side plates 12 and the first pin holes 13 are aligned, and the rotation connection with the horizontal rod 1 is realized by installing a pin shaft.

[0039] The locking member includes a locking block 3. One end of the locking block 3 is hinged to the position near the top end of the side rod 2, and a long circular hole 15 is provided at the other end. A threaded hole is provided at the rear side of the first pin hole 13 on the side plate 12. The fixing member passes through the long circular hole 15 and cooperates with the threaded hole 16 to fix the relative positions of the side rod 2 and the horizontal rod 1.

[0040] Specifically, a second pin hole 14 is provided near the top end of the side rod 2. The bottom end of the locking block is provided with a second pin hole 14, and a long circular hole 15 is provided at the top end. The positions of the second pin holes 14 of the locking block 3 and the side rod 2 correspond and a pin shaft is installed to realize rotational cooperation. A threaded hole 16 is provided at the rear end of the side plate. The fixing member can be a bolt.

[0041] As Figure 1 shown, when the relative positions of the horizontal rod 1 and the side rod 2 are determined, the bolt passes through the long circular hole 15 and is fixedly connected to the threaded hole. The bolt is tightened so that the bolt head presses against the locking block 3, realizing the relative fixation of the position of the locking block 3 and the horizontal rod 1, and achieving the purpose of locking the relative positions of the horizontal rod 1 and the side rod 2.

[0042] The purpose of setting the long circular hole 15 is to realize the adjustable angle between the horizontal rod 1 and the side rod 2. After the angle is determined, the relative angle between the horizontal rod 1 and the side rod 2 can be locked by using a bolt.

[0043] In this embodiment, the side rod 2 is used to abut against the side of the conical cage, and the horizontal rod 1 is used to abut against the top surface of the conical cage, as Figure 7 and Figure 8 shown.

[0044] The digital caliper has a fixed end 54 and a digital display sliding end 55. The fixed end 54 is located at the starting end of the scale 53, and the digital display sliding end 55 can slide on the scale 53.

[0045] The distance between the fixed end 54 and the digital display sliding end 55 is the size of the object to be measured. The digital display sliding end 55 is integrated with a display screen 56, which can directly display the size data. This part is the prior art.

[0046] As Figure 3 shown, clamping blocks 51 are provided at the bottom ends of the fixed end 54 and the digital display sliding end 55 of the digital caliper. Grooves are provided at the bottom surface of the clamping blocks 51, and the measurement positioning block 4 can be sleeved through the grooves. A tightening member 52 is provided at the side of the clamping block 51. The tightening member 52 is of a screw structure and can pass through the side wall of the clamping block 51 and enter the groove to tighten the measurement positioning block 4, so as to fix the position of the clamping block 51 and the measurement positioning block 4.

[0047] As Figure 3 shown, the clamping block 51 is sleeved on the measurement positioning block 4 through the groove and the positioning block is tightened by the tightening member 52. The front sides of the two clamping blocks 51 are aligned with the front end face of the horizontal rod 1. After the clamping block 51 cooperates with the locking positioning block 4, the reading indication on the display screen 56 is the distance between the front ends of the two groups of horizontal rods. Therefore, the distance between the front ends of the two groups of horizontal rods 1 can be directly displayed through the display screen 56 on the digital display sliding end 55, and the distance 17 between the front ends of the two groups of horizontal rods is used as the initial measurement value.

[0048] As Figure 1 shown, the widths of the side rod 2 and the horizontal rod 1 in this embodiment are the same, and the rotation connection point (the center of the first pin hole 13) is located at the middle position in the width direction of the side rod 2 and the horizontal rod 1. Therefore, the distance from the rotation connection point to the bottom surface of the horizontal rod is equal to the distance to the side edge in the length direction of the side rod 2.

[0049] According to the side inclination angle of the conical cage 102, the distance from the front end of the horizontal rod 1 to the edge of the small end face of the conical cage 102 can be calculated as the compensation data value, so as to obtain the outer diameter size. The side inclination angle of the conical cage 102 can be measured by an inclinometer.

[0050] During measurement, lock the clamping blocks 51 of the digital caliper with the two groups of measurement positioning blocks 4, pull apart the two groups of positioning tools, so that the horizontal rods 1 of the two groups of positioning tools are stuck on the top surface of the conical cage 102, and the side rod 2 abuts against the side surface of the cage. Then lock and fix the bolts on the long circular holes 15. The state at this time is as Figure 8As shown, the straight line where the two groups of positioning tools are located is close to the diameter line of the top surface of the cage. Then, with one group of positioning tools as the center, the other group of positioning tools is rotated clockwise or counterclockwise. During the process, the display screen 56 can display multiple groups of different data. Take the maximum value, which represents that the two groups of positioning tools are on the same diameter line of the cage. At this time, this maximum value is the initial measurement value L scale.

[0051] As Figure 7 As shown, let the inclination angle of the side surface of the cage be α, and the widths of the side rod 2 and the horizontal rod 1 be 2R. Then, the distance from the rotation connection point to the bottom surface of the horizontal rod 1: the length of OB is R, and the horizontal distance between the vertical line where the rotation connection point O is located and the edge of the conical cage is L.

[0052] The line OA is the midline of the side rod 2. Make an auxiliary line AC perpendicular to MD. The point M is the point at the bottom end of the side of the cage, and the edge point of the cross-section of the cage is the point D. The auxiliary line DN is perpendicular to MN, obtaining △ACD. Let the length of AD be L1 and the length of AB be L2. Then, L = L1 - L2.

[0053] Since ∠ADC = ∠DMN = α, ∠OAB = ∠ADC, and OB = AC = R, therefore, L1 = R / sinα, and L2 = R / tanα. Then, L = R(1 - cosα) / sinα.

[0054] In this embodiment, the horizontal distance from the front end 17 of the horizontal rod to the rotation connection point is preferably 50 mm. Subtracting L gives the compensation data value. Then, for the two groups of positioning tools, the sum of the initial data value and twice the compensation data value is the outer diameter to be measured.

[0055] In practical applications, a table of twice the compensation data value corresponding to the inclination angle can be generated. After measuring the inclination angle with an inclinometer, by querying the table, the value that the initial data value should increase can be known.

[0056] This embodiment can quickly measure the outer diameter of the small end face of the conical cage 102 by using positioning tools, a digital caliper, and an inclinometer. And when measuring, it is not necessary to remove the cage from the mold 101, and it can be directly measured. At the same time, these structures occupy a small volume, are convenient to carry, the measurement process is simple, and the work efficiency is improved.

[0057] It can be understood that the measuring tooling in this embodiment is a preliminary measurement of the outer diameter of the cage. Therefore, a certain error is allowed. By operating according to the standard steps, the error can be within a controllable range, and the controllable error will not affect the subsequent work.

[0058] Embodiment 2

[0059] In a typical implementation manner of the present invention, as Figures 4-6As shown in the figure, this embodiment also includes two sets of positioning tools. Different from Embodiment 1, the structures and connection methods of the horizontal rod 1 and the side rod 2 are different. In this embodiment, the structure of the locking block 3 is cancelled.

[0060] As Figure 6 shown, a long groove 7 of the same form as the slot 11 is opened at the rear end of the horizontal rod 1 to form a side plate 12. A pin hole is provided on the side plate 12 and is connected to the pin hole at the top end of the side plate 2 through a pin shaft 61. The width of the side rod 2 and the horizontal rod 1 in this embodiment is the same, and the rotation connection point is located at the middle position in the width direction of the side rod 2 and the horizontal rod 1. Therefore, the distance from the rotation connection point to the bottom surface of the horizontal rod 1 is equal to the distance to the side edge in the length direction of the side rod 2, which is the same as that in Embodiment 1. A measurement positioning block is also provided at the top position of the front end of the horizontal rod.

[0061] Different from Embodiment 1, a torsion spring 6 is sleeved at the pin shaft 61 where the top end of the side rod 2 and the rear end of the horizontal rod 1 are connected. The torsion spring 6 makes the side rod have a tendency to rotate along the position of the pin shaft and approach the horizontal rod.

[0062] A limiting plate 71 is provided at the top surface position near the front end of the horizontal rod 1. The limiting plate 71 is located at the front top position of the long groove 7. The limiting plate 71 has a set thickness and is flush with the top surface of the horizontal rod 1. The limiting plate 71 is used to abut against the side rod so that the side rod contracts into the horizontal rod under the action of the torsion spring; a step structure is provided on the inner side surface of the bottom end of the side rod, and the size of the step structure is adapted to the thickness of the limiting plate, so that after the side rod 2 contracts into the horizontal rod 1, the top surface and the bottom surface of the side rod 2 are correspondingly flush with the top surface and the bottom surface of the horizontal rod 1.

[0063] In this embodiment, the side rod 2 and the horizontal rod 1 adopt a connection method of a pin shaft with a torsion spring, and the structure of the locking block 3 is cancelled. The measurement distance is the same as that in Embodiment 1 and also adapts to the corresponding calculation formula.

[0064] Compared with Embodiment 1, the connection method of using the pin shaft 61 with a torsion spring can achieve that when not in use, the side rod can be completely contracted inside the horizontal rod 1, making the positioning tool into a rod-shaped structure. Under the condition of ensuring the same function and achieving the same effect as Embodiment 1, it can further reduce the volume occupied by the positioning tool and make it more convenient to carry. The setting of the torsion spring 6 can make the side rod always tightly abut against the side surface of the cage to ensure the measurement accuracy.

[0065] Embodiment 3

[0066] In a typical implementation manner of the present invention, a method for measuring the outer diameter of the end face of a portable conical frustum adopts the outer diameter measuring tooling as in Embodiment 1, and includes the following steps:

[0067] The side rods 2 of the two sets of positioning tools abut the sides of the conical retainer 102, while the horizontal rod 1 abuts the top surface of the conical retainer 102. The horizontal rods 1 and side rods 2 are locked together using locking blocks 3 and bolts. The front ends of the two sets of horizontal rods 1 are fixedly connected to the fixed end 54 and the digital sliding end 55 of the digital caliper. The two sets of positioning tools are adjusted to the same diameter line of the conical retainer 102. Each positioning tool is slightly moved to measure multiple points, and the maximum value is used as the initial measurement. The inclination angle of the side of the conical retainer is then measured using an inclinometer. Compensation data is calculated based on the side inclination angle to obtain the measured outer diameter data.

[0068] When using the outer diameter measuring tool of Example 2, directly break the side rod 2 out from the horizontal rod 1, and place the tool against the corresponding position of the frustum retainer. The other methods are the same as the above steps.

[0069] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A portable measuring tool for the outer diameter of the small end face of a conical cage, characterized in that It includes two groups of positioning tools. The positioning tools include a horizontal rod and a side rod. The top end of the side rod is rotatably connected to the rear end position of the horizontal rod. The side rod is used to abut against the side of the conical cage, and the horizontal rod is used to abut against the top surface of the conical cage. The widths of the side rod and the horizontal rod are the same, and the rotation connection point is located at the middle position in the width direction of the side rod and the horizontal rod. A locking member is provided between the side rod and the horizontal rod after the abutting state is completed to lock the positioning state of the positioning tool. The front ends of the two groups of horizontal rods are used to connect the fixed end and the digital display sliding end of the digital caliper to obtain the distance between the front ends of the two groups of horizontal rods as the initial measurement value. After that, according to the inclination angle of the side of the conical cage, calculate the distance from the front end of the horizontal rod to the edge of the small end face of the conical cage as the compensation data value, so as to obtain the outer diameter size.

2. The portable measuring tool for the outer diameter of the small end face of the conical cage according to claim 1, characterized in that, A measurement positioning block is provided at the top position of the front end of the horizontal rod. A groove is provided at the rear end position of the horizontal rod, and a first pin hole is provided for hinging with the side rod.

3. The portable measuring tool for the outer diameter of the small end face of the conical cage according to claim 2, wherein, At the bottom ends of the fixed end and the digital display sliding end of the digital caliper, there are clamping blocks. There are grooves at the bottom surface of the clamping blocks, and a tightening member is provided at the side of the clamping blocks. The clamping blocks are sleeved on the positioning blocks through the grooves and the tightening member is used to tighten the positioning blocks, so that the distance between the front ends of the two groups of horizontal rods is directly displayed on the display screen of the digital display sliding end.

4. A portable measuring tool for the outer diameter of the small end face of a conical cage, according to claim 2, characterized in that The rear end position of the horizontal rod is grooved to form side plates on the front and rear sides. The top end of the side rod and the corresponding positions on the side plates are provided with first pin holes to cooperate with the pin shafts.

5. The portable measuring tool for the outer diameter of the small end face of the conical cage according to claim 4, characterized in that, The locking member includes a locking block. One end of the locking block is hinged to the position near the top end of the side rod, and the other end is provided with an oblong hole. A threaded hole is provided at the rear side of the first pin hole on the side plate. The fixing member passes through the oblong hole and cooperates with the threaded hole to fix the relative positions of the side rod and the horizontal rod.

6. The portable measuring tool for the outer diameter of the small end face of the conical cage according to claim 4, characterized in that, A torsion spring is provided at the pin shaft connecting the top end of the side rod and the rear end of the horizontal rod. The torsion spring makes the side rod have a tendency to rotate along the position of the pin shaft and approach the horizontal rod.

7. A portable measuring tool for the outer diameter of the small end face of a conical cage, as described in claim 6, characterized in that, A limiting plate is provided at the top surface position near the front end of the horizontal rod. The limiting plate has a set thickness and is used to abut against the side rod so that the side rod shrinks into the horizontal rod under the action of the torsion spring. A step structure is provided on the inner side surface of the bottom end of the side rod, and the size of the step structure is adapted to the thickness of the limiting plate.

8. A portable measuring tool for the outer diameter of the small end face of a conical retainer according to claim 1, characterized in that The inclination angle of the side of the conical cage can be measured by an inclinometer.

9. A portable measuring tool for the outer diameter of the small end face of a conical cage, according to claim 1, wherein Let the inclination angle be α, the width of the rod be 2R, the horizontal distance between the vertical line where the rotation connection point is located and the edge of the conical cage be L, and the horizontal distance from the front end of the horizontal rod to the rotation connection point minus L is the compensation data value. L = R(1 - cosα) / sinα; the sum of the initial data value and twice the compensation data value is the outer diameter to be measured.

10. A portable method for measuring the outer diameter of the end face of a frustum of a cone, characterized in that, Using the outer diameter measuring tooling as described in any one of claims 1-9, it includes the following steps: The side rods of the two groups of positioning tools abut against the sides of the conical cage, the horizontal rods abut against the top surfaces of the conical cage, the front ends of the two groups of horizontal rods are fixedly connected to the fixed end and the digital display sliding end of the digital caliper, adjust the positions of the two groups of positioning tools on the same diameter line of the conical cage, and measure multiple point data and take the maximum value as the initial measurement value; After that, calculate the compensation data value according to the side inclination angle, so as to obtain the outer diameter data to be measured.

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