CN211824165U - A tool for measuring the length on a nominal circle of a conical surface - Google Patents

Abstract

The utility model discloses a length measurement instrument on conical surface nominal circle, include: the gauge stand is provided with a reference surface at one side opposite to the bearing seat, and a mandrel mounting hole with a central line perpendicular to the reference surface is arranged in the middle in a penetrating manner; one end of the positioning core shaft is matched with the core shaft mounting hole, and the other end of the positioning core shaft is matched with an inner hole of the bearing seat; the dial indicator is detachably arranged on the gauge stand; and the middle part of the lever is hinged on the gauge stand, one end of the lever is in contact with the contact of the dial indicator, and the other end of the lever is in contact with the position to be measured of the conical surface of the bearing stand. The utility model discloses a set up positioning core axle and rotatable lever on the gauge stand, utilize the lever principle to carry out high-efficient measurement to the position size that is difficult for detecting on the bearing frame, can show in mass production and improve detection work efficiency, can also guarantee the part measuring accuracy degree simultaneously, easy and simple to handle, with low costs, have very high spreading value.

Description

A tool for measuring the length on a nominal circle of a conical surface

technical field

The utility model relates to the field of measuring tools, in particular to a length measuring tool on a nominal circle of a conical surface.

Background technique

Bearing seat is widely used in the field of aviation machinery as a common mechanical component. In the bearing seat shown in Figure 1, one end of the bearing seat is provided with a conical surface. Due to design requirements, during the measurement process after mass production , it is often required that the distance from the specified diameter on the conical surface to the end face of the bearing seat meets certain dimensional accuracy requirements. The most common measurement method is to use three-coordinate measurement, but the three-coordinate measurement takes a long time, and the measurement workload after mass production of parts is too large, which seriously affects the production progress.

Utility model content

The utility model provides a length measuring tool on a nominal circle of a conical surface, which solves the problems that the three-coordinate measurement takes a long time in the existing conical surface measurement, the measurement workload is too large after the parts are mass-produced, and the production progress is affected.

The technical scheme adopted by the utility model is as follows:

A tool for measuring the length on a nominal circle of a conical surface, comprising:

A watch seat, a reference plane is arranged on one side of the watch seat opposite to the bearing seat, and a mandrel mounting hole with a center line perpendicular to the reference plane is arranged in the middle part;

A positioning mandrel, one end is matched with the mounting hole of the mandrel, and the other end is matched with the inner hole of the bearing seat;

a dial indicator, which is detachably installed on the upper part of the table base;

A lever, the middle part of the lever is hinged on the upper part of the watch seat, and one end of the lever is in contact with the contact of the dial indicator, and the other end is in contact with the position to be measured on the conical surface of the bearing seat.

Further, the positioning mandrel is in the shape of a stepped shaft, and includes a bearing seat positioning section and a watch seat connecting section arranged coaxially, and the cylindrical surface of the bearing seat positioning section is matched with the inner hole of the bearing seat; the watch seat The cylindrical surface of the connecting section is matched with the mounting hole of the mandrel of the watch seat.

Further, the matching gap between the bearing seat positioning section and the bearing seat inner hole is 0.005-0.01 mm, and the gap between the watch seat connecting section and the mandrel mounting hole is 0.005-0.01 mm.

Further, a limiting device for limiting the circumferential position and the axial position of the watch seat connecting section and the mandrel mounting hole is further provided between the watch seat connecting section and the mandrel mounting hole.

Further, the limiting device includes a positioning pin, the connecting section of the watch base and the mounting hole of the mandrel are each provided with a semicircular positioning groove that together form a circular positioning hole after assembly, and the positioning pin is inserted into the mounting hole. in the positioning hole; the axis of the positioning groove is perpendicular to the plane where the reference plane is located.

Further, a hinge hole is provided in the middle of the lever, a lever mounting hinge seat with a hinge hole is provided on the watch base, and the lever is pivotally hinged on the lever mounting hinge seat through a shaft pin.

Further, the clearance between the shaft pin and the hinge hole is 0.005-0.01 mm.

Further, the ratio between the length of the contact point of the lever and the dial indicator to the rotation center of the lever and the length of the contact point of the conical surface of the lever and the bearing seat to the rotation center of the lever is 1:1.

Further, the upper part of the watch seat is provided with a dial indicator mounting hole for installing the dial indicator.

Further, the dial indicator mounting hole is provided with a watch jacket for clamping the dial indicator, and one side of the watch seat is provided with a watch clip locking screw for adjusting the clamping force of the watch jacket. .

Compared with the prior art, the utility model has the following beneficial effects:

By arranging a positioning mandrel and a rotatable lever on the watch seat, the utility model utilizes the lever principle to efficiently measure the dimensions of the parts on the bearing seat that are not easy to detect, and solves the problem that the three-coordinate measuring method is used for expensive equipment, long time, and batches of parts. The problem of too much measurement workload after production can significantly improve the detection efficiency in mass production, and at the same time ensure the accuracy of parts measurement, easy operation, low cost, and high promotion value.

In addition to the objects, features and advantages described above, the present invention has other objects, features and advantages. The present utility model will be described in further detail below with reference to the accompanying drawings.

Description of drawings

The accompanying drawings constituting a part of the present application are used to provide further understanding of the present invention, and the schematic embodiments of the present invention and descriptions thereof are used to explain the present invention and do not constitute an improper limitation of the present invention. In the attached image:

Figure 1 is a schematic diagram of the structure and dimensions of the bearing seat to be tested.

FIG. 2 is a schematic cross-sectional view of the overall assembly of the preferred embodiment of the present invention.

FIG. 3 is a schematic left side view of the overall assembly of the preferred embodiment of the present invention.

FIG. 4 is a schematic structural diagram of a positioning mandrel according to a preferred embodiment of the present invention.

FIG. 5 is a schematic cross-sectional view of a watch piece according to a preferred embodiment of the present invention.

FIG. 6 is a schematic diagram of zero calibration performed by a preferred embodiment of the present invention.

FIG. 7 is a schematic diagram of the preferred embodiment of the present invention measuring the bearing seat to be tested.

In the figure: 1, bearing seat; 2, shaft pin; 3, lever; 4, watch jacket; 5, dial indicator; 6, positioning pin; 7, watch seat; 8, positioning mandrel; 81, bearing seat positioning Section; 82, connecting section of watch seat; 83, positioning groove; 9, locking screw of watch clamp; 10, positioning hole; 11, lever mounting hinge seat; 12, watch part; 13, mandrel mounting hole; 14, datum.

Detailed ways

It should be noted that the embodiments in the present application and the features of the embodiments may be combined with each other in the case of no conflict. The present utility model will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.

As shown in Figure 1, the bearing seat 1, in the later quality inspection process of the bearing seat 1, needs to measure the length dimension of the conical surface with a diameter of φ123mm from the end face. Among them, if the design requirement of the length dimension is 5 ( 0, -0.05). Since the conical surface is located on the inner side of the bearing seat 1, it is difficult to measure it directly, so it needs to be measured by means of three-coordinate measurement, which has low efficiency and high cost.

In order to realize the rapid and accurate detection of the above dimensions, as shown in FIG. 2 and FIG. 3 , this embodiment provides a length measuring tool on a nominal circle of a conical surface, the measuring tool includes a watch seat 7 and a positioning mandrel 8 , Dial indicator 5, Lever 3.

A reference surface 14 is provided on the side of the watch seat 7 opposite to the bearing seat 1 , and a mandrel mounting hole 13 with a centerline perpendicular to the reference surface is arranged in the middle part; one end of the positioning mandrel 8 is connected to the mandrel. The mounting hole 13 is matched, and the other end is matched with the inner hole of the bearing seat 1, and is coaxial with the inner hole of the bearing seat 1 during measurement; the dial indicator 5 is detachably installed on the upper part of the watch seat 7; The middle of the lever 3 is hinged on the upper part of the watch seat 7 , and one end of the lever 3 is in contact with the contact of the dial indicator 5 , and the other end is in contact with the position to be measured on the conical surface of the bearing seat 1 .

In this embodiment, the positioning mandrel 8 is installed on the watch seat 7. Since the positioning mandrel 8 is matched with the inner hole of the bearing seat 1, when measuring, only the inner hole of the bearing seat 1 needs to be sleeved. By inserting the positioning mandrel 8 into the positioning mandrel 8 and keeping the end surface in contact with the watch seat 7, the bearing seat 1 can be quickly positioned without any other measuring instruments. After the bearing seat 1 is installed in place, the bending section of the rotatable lever 3 can extend into the conical end face of the bearing seat 1 and contact the position to be measured on the conical end face to realize the measurement, which solves the problem of zero caused by structural reasons. For the problem that the measurement position of the component is not good and it is difficult to measure the characteristic part, the position of the contact point between the lever 3 and the conical end face can be set by implementing, for example, by setting the distance from the rotational center position of the lever 3 to the axis of the mandrel mounting hole 13 Determine, or determine by setting the length of the lever 3 to ensure that the distance between the contact point of the lever 3 and the conical end face to the axis of the mandrel mounting hole 13 meets the measurement needs, as in this embodiment, the contact point of the lever 3 and the conical end face The distance to the axis of the mandrel mounting hole 13 is φ123mm. As shown in Figure 3, the main body of the watch seat 7 in this embodiment is roughly in the shape of a rectangular plate with missing corners, the length is slightly larger than the inner hole diameter of the bearing seat 1, and the width is much smaller than the inner hole diameter of the bearing seat 1, so as to reduce the volume and weight, The upper end of the main body of the watch base 7 is provided with a narrower connecting portion for installing the lever 3 and the dial indicator 5. The setting of the watch base 7 can reduce the volume and weight of the measuring tool, which is convenient for the operator to measure.

的内孔长度相匹配即可，通过与表座7相配合，既实现了对轴承座1的快速定位，同时也减少量具的重量和体积，减少操作人员的疲劳。Specifically, as shown in FIG. 4 , the positioning mandrel 8 is in the shape of a stepped shaft, and includes a bearing seat positioning section 81 and a surface seat connecting section 82 arranged coaxially. The cylindrical surface of the bearing seat positioning section 81 and the bearing seat 1 The inner holes are matched; the cylindrical surface of the connecting section 82 of the watch seat is matched with the mounting hole 13 of the mandrel of the watch seat 7 . In order to reduce the weight and reliability of the positioning mandrel 8 , the length of the table seat connecting section 82 is close to the length of the mandrel mounting hole 13 , and the length of the bearing seat positioning section 81 is the same as the length of the inner hole of the bearing seat 1 . The processing length can be matched, and there is no need to extend into the bearing seat 1 too much. For example, in this embodiment, the length of the bearing seat positioning section 81 only needs to be the same as the diameter of the right side of the bearing seat in FIG. 1 .

The length of the inner hole of the measuring tool can be matched. By matching with the table seat 7, it not only realizes the rapid positioning of the bearing seat 1, but also reduces the weight and volume of the measuring tool and reduces the fatigue of the operator.

In order to ensure measurement accuracy, the fitting clearance between the bearing seat positioning section 81 and the inner hole of the bearing seat is 0.005-0.01 mm, and the clearance between the watch seat connecting section 82 and the mandrel mounting hole 13 is 0.005-0.01 mm. If the clearance is too large, the position of the contact point between the lever 3 and the conical surface of the bearing seat 1 will not meet the relevant requirements, resulting in a decrease in the measurement accuracy. If the clearance is too small, it will increase the processing cost and make it difficult to install. Therefore, it is necessary to adjust the above fitting clearance accordingly. After a large number of experiments, the gap range limited in this embodiment can well take into account the two dimensions of processing cost and measurement accuracy, ensuring that the final measurement data meets the corresponding measurement requirements.

As shown in FIG. 2 to FIG. 4 , between the watch seat connecting section 82 and the mandrel mounting hole 13 is further provided with a spacer for limiting the circumferential and axial positions of the watch seat connecting section 82 and the mandrel mounting hole 13 . Limiter. The limiting device includes a positioning pin 6 , and a semi-circular positioning groove 83 that forms a circular positioning hole 10 after assembly is respectively provided on the table base connecting section 82 and the mandrel mounting hole 13 . The positioning pin 6 Inserted into the positioning hole 10 ; the axis of the positioning groove 83 is perpendicular to the plane where the reference plane 14 is located.

Since the connecting section 82 of the watch seat and the mounting hole 13 of the mandrel are in clearance fit, in order to facilitate disassembly and assembly and the reliability of the connection, in this embodiment, a positioning hole 10 is provided between the connecting section 82 of the watch seat and the mounting hole 13 of the mandrel, and A positioning pin 6 is inserted into the positioning hole 10 , and the positioning pin 6 can well limit the relative rotation and axial movement between the connecting section 82 of the watch base and the spindle mounting hole 13 . The design of this embodiment does not affect the assembly and disassembly between the connecting section 82 of the watch seat and the mounting hole 13 of the mandrel, and also ensures the stability of the connection between the connecting section 82 of the base and the mounting hole 13 of the mandrel for subsequent measurements Accuracy provides the necessary guarantee.

As shown in FIG. 2 and FIG. 3 , a hinge hole is provided in the middle of the lever 3 , a lever mounting hinge seat 11 with a hinge hole is symmetrically arranged on the watch base 7 , and the lever 3 is pivotally hinged at the place through the shaft pin 2 . The lever is installed on the hinge base 11 to ensure that the lever 3 can rotate flexibly around the pivot pin 2. At the same time, in order to ensure the flexible rotation of the lever 3 and the accurate assembly position of the lever 3, the pivot pin 2 is hinged to the pivot pin 2. There is no need to set a matching gap that meets the requirements between the holes. In this embodiment, the matching gap between the shaft pin 2 and the hinge hole is 0.005-0.01 mm, so that the lever 3 has an accurate fit while ensuring the flexible rotation of the lever 3. The assembly position is to ensure the measurement accuracy. If the matching gap is too small, the sensitivity of the lever 3 will not be enough. If the matching gap is too large, the assembly position of the lever 3 will be difficult to guarantee, thus affecting the subsequent measurement accuracy.

As shown in Figure 2, the length from the contact point of the lever 3 and the dial indicator 5 to the rotation center of the lever 3 is L1, and the length from the contact point of the lever 3 and the conical surface of the bearing seat 1 to the rotation center of the lever 3 is L2 , In this embodiment, the ratio of L1 and L2 is 1:1, that is, L1 is equal to L2, but when the ratio of L1 and L2 is 1:1, when the lever 3 contacts the end of the conical surface of the bearing seat 1, the lever 3 When the rotation center is displaced, the contact point of the lever 3 and the dial indicator 5 will produce an equal proportion of displacement, thereby pushing the contact of the dial indicator 5 to move in equal proportions. The indication is the actual displacement, which is intuitive and accurate without further conversion. If the ratio of L1 and L2 is not 1:1, the indication indicated by the pointer of the dial indicator 5 is not the actual displacement, and it is necessary to enter the corresponding Only after conversion can the real displacement data be obtained. Due to the addition of conversion steps, the detection efficiency is bound to be negatively affected to a certain extent.

As shown in FIG. 2 and FIG. 3 , a dial indicator mounting hole for mounting the dial indicator 5 is provided through the dial base 7 , and a dial indicator mounting hole is provided in the dial indicator mounting hole for clamping the dial indicator In the watch jacket 4 of the watch 5, one side of the watch base 7 is provided with a watch clip locking screw 9 for adjusting the clamping force of the watch jacket 4. When installing, insert the dial indicator 5 into the watch Jacket 4. After adjusting the position, the dial indicator 5 can be locked by tightening the clamp locking screw 9. After the measurement is completed, the dial indicator 5 can be removed and put into the instrument box. The operation of disassembly is the opposite of installation, and the whole process is simple and quick.

The measuring process of the length measuring tool on the nominal circle of the tapered surface described in the above embodiments will be described in detail below.

1. Before the formal measurement, the dial indicator 5 needs to be zeroed. During zero adjustment, put the machined counter watch piece 12 into the measuring tool to position the positioning mandrel 8 to ensure that the right end face of the counter watch piece 12 is in close contact with the reference surface 14, as shown in Figures 5 and 6, The pair of watch pieces 12 are parts that have been processed in advance and whose key dimensions meet the design standards, that is, the distance from the conical surface of the pair of watch pieces 12 at φ123mm to the end face is 5mm (0, -0.01). , Set the corresponding mark on the conical surface of the watch piece 12 at φ123mm, adjust the lever 3 and the dial indicator 5, and lock the dial indicator 5 with the clamping screw 9. At this time, one end of the lever 3 just touches At the mark on the conical surface of the watch piece 12, and the contact of the dial indicator 5 is also kept in contact with the other end of the lever 3, the pointer of the dial indicator 5 will be deflected to a certain angle to adjust the dial indicator. The pointer is set to point to zero, and the zero adjustment of the dial indicator 5 is completed. It should be noted that, although the pointer points to zero at this time, the contact of the dial indicator 5 is still in contact with the other end of the lever 3, that is, the contact of the dial indicator 5 and the lever 3 remain fixed. interaction force.

2. After completing the zero adjustment of the dial indicator 5, remove the counter 12, and turn the bearing seat 1 to be measured into the measuring tool to locate the mandrel 8 to ensure that the right end face of the bearing seat 1 is in close contact with the reference surface 14. , as shown in Figure 7, one end of the lever 3 is in contact with the conical surface of the bearing seat 1, and the deflection of the dial indicator 5 is observed at the same time. When the deflection value meets the preset value, it is judged that the part is qualified, otherwise it is unqualified, For example, in this embodiment, the measured value at the mark of the watch piece 12 is 5. When the pointer deviates in a small direction within 0.05 of the indicated number, it means that the part is qualified; otherwise, it means that the part is unqualified.

It can be seen that the tool for measuring the length on the nominal circle of the tapered surface of the present invention can realize the rapid positioning of the measuring tool, and at the same time, combined with the lever principle and the dial indicator, it can quickly and accurately identify the eligibility of the relevant processing dimensions of the parts, which greatly improves the Parts detection efficiency, simple structure, convenient operation, low cost, low requirements for operators, and high promotion value.

The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments, and the same or similar parts of the various embodiments may be referred to each other.

The above descriptions are only preferred embodiments of the present utility model, and are not intended to limit the present utility model. For those skilled in the art, the present utility model may have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims (10)

1. a length measuring tool on a tapered nominal circle, is characterized in that, comprises: A watch seat (7), a reference surface (14) is provided on the side of the watch seat (7) opposite to the bearing seat (1), and a mandrel mounting hole with a center line perpendicular to the reference surface (14) is arranged through the middle of the watch seat (7) (13); A positioning mandrel (8), one end is matched with the mandrel mounting hole (13), and the other end is matched with the inner hole of the bearing seat (1); a dial indicator (5), which is detachably mounted on the upper part of the meter seat (7); A lever (3), the middle part of the lever (3) is hinged on the upper part of the watch seat (7), and one end of the lever (3) is in contact with the contact of the dial indicator (5), and the other end is in contact with the contact of the dial indicator (5). The conical surface of the bearing seat (1) is in contact with the position to be measured. 2 . The tool for measuring the length on a nominal circle of a tapered surface according to claim 1 , wherein the positioning mandrel ( 8 ) is in the shape of a stepped shaft, and includes a bearing seat positioning section ( 81 ) and a watch seat that are coaxially arranged. 3 . A connecting section (82), the cylindrical surface of the bearing seat positioning section (81) is matched with the inner hole of the bearing seat (1); the cylindrical surface of the watch seat connecting section (82) is matched with the watch seat (7) The mounting hole (13) of the mandrel is matched. 3. The tool for measuring the length on a nominal circle of a tapered surface according to claim 2, wherein the fitting clearance between the bearing seat positioning section (81) and the inner hole of the bearing seat is 0.005-0.01 mm, and the watch seat is connected to The gap between the segment (82) and the mandrel mounting hole (13) is 0.005-0.01 mm. 4. The tool for measuring the length on the nominal circle of the tapered surface according to claim 2, characterized in that, between the connecting section (82) of the watch seat and the mounting hole (13) of the mandrel, a device for limiting the watch seat is also provided Limiting devices for the circumferential and axial positions of the connecting section (82) and the mandrel mounting hole (13). 5. The tool for measuring the length on a nominal circle of a tapered surface according to claim 4, wherein the limiting device comprises a positioning pin (6), a connecting section (82) of the watch seat and a mandrel mounting hole (13). ) are each provided with semicircular positioning grooves (83) which together form a circular positioning hole (10) after assembly, and the positioning pins (6) are inserted into the positioning holes (10); the positioning grooves ( The axis of 83) is perpendicular to the plane where the reference plane (14) is located. 6. The tool for measuring the length on a nominal circle of a tapered surface according to claim 1, wherein a hinge hole is provided in the middle of the lever (3), and a lever installation with a hinge hole is provided on the table base (7). A hinge seat (11), the lever (3) is pivotally hinged on the lever mounting hinge seat (11) through a shaft pin (2). 7 . The tool for measuring the length on a nominal circle of a tapered surface according to claim 6 , wherein the clearance between the shaft pin ( 2 ) and the hinge hole is 0.005-0.01 mm. 8 . 8. The tool for measuring the length on a nominal circle of a tapered surface according to claim 1, wherein the length from the contact point of the lever (3) and the dial indicator (5) to the center of rotation of the lever (3), the length of the The ratio of the length of the contact point of the lever (3) with the conical surface of the bearing seat (1) to the rotation center of the lever (3) is 1:1. 9 . The tool for measuring the length on a nominal circle of a tapered surface according to claim 1 , wherein a dial indicator mounting hole for mounting the dial indicator ( 5 ) is provided through the upper part of the table base ( 7 ). 10 . 10 . The tool for measuring the length on a nominal circle of a tapered surface according to claim 9 , wherein a watch jacket ( 4 ) for clamping the dial indicator ( 5 ) is provided in the dial indicator mounting hole. 11 . One side of the watch seat (7) is provided with a watch clamp locking screw (9) for adjusting the clamping force of the watch sleeve (4).

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