A new spring gauge for measuring internal hole or external circle diameter

Abstract

The application discloses a novel spring gauge for measuring the diameter of an inner hole or an outer circle, comprising a connecting rod provided with a measuring table, a first moving part configured to be able to move a short distance along the length direction of the connecting rod, a first gauge connected to the first moving part, two springs of the same deformation on the two sides of the first moving part, the springs being able to deform along the moving direction of the first moving part when the first moving part moves, and one side of the first moving part being in contact with the head of the measuring table, and a second moving part configured to be able to move a long distance along the length direction of the connecting rod, a second gauge connected to the second moving part, the distance between the first gauge and the second gauge being adapted to the diameter of the inner hole or the outer circle to be measured by moving the second moving part, so as to correspond to the measuring requirements of different inner hole or outer circle diameters.

Description

Technical Field

[0001] This application belongs to the field of bore diameter measuring tools, and in particular relates to a novel spring gauge for measuring the diameter of inner holes or outer circles. Background Technology

[0002] In the field of mechanical manufacturing, many mechanical parts have complex internal hole structures, which play a crucial role in realizing the function of the parts. Taking the brake housing as an example, its internal hole is provided with an annular groove for installing a sealing ring. This annular groove not only has a certain depth requirement, often greater than 50mm, but also has an annular groove structure on the side. This complex internal hole structure is to meet the strict sealing requirements of the brake during operation. However, if the size of the sealing ring installation groove does not meet the standard, it will directly lead to problems such as brake leakage, thereby affecting the performance and safety of the entire braking system.

[0003] However, current methods for dimensional inspection of parts with complex internal hole structures face numerous challenges. Traditional inspection methods typically require multiple different gauges to measure different dimensions within the part's internal hole. For example, measuring the four key dimensions of the groove for installing the sealing ring inside a brake housing requires four different gauges. In practice, inspectors frequently need to switch between these gauges. This not only increases operational complexity but also increases the risk of errors due to improper operation, and frequent gauge switching significantly prolongs inspection time. On the production line, the length of inspection time directly impacts production efficiency. Prolonged inspection processes extend production cycles and reduce production line capacity. Especially in large-scale production, this wasted time accumulates into substantial cost losses. Therefore, developing a device and method for efficiently and accurately inspecting the dimensions of parts with complex internal hole structures is of significant practical importance for improving production efficiency, ensuring product quality, and reducing production costs. Utility Model Content

[0004] This invention provides a novel spring gauge for measuring the diameter of inner holes or outer circles. It addresses the problem that frequent gauge switching is required when inspecting the dimensions of parts with complex inner hole structures, leading to complicated operation, long inspection time, and consequently affecting production.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A novel spring gauge for measuring the diameter of an inner hole or outer circle includes:

[0007] A connecting rod, on which a measuring instrument is installed;

[0008] A first movable member is configured to move a short distance along the length of the connecting rod. The first movable member is connected to a first measuring instrument. Two springs with the same deformation are respectively abutted on both sides of the first movable member. The springs can deform along the moving direction of the first movable member when the first movable member moves, and one side of the first movable member is in contact with the meter head of the measuring instrument.

[0009] The second movable component is configured to move a long distance along the length of the connecting rod. The second movable component is connected to a second measuring instrument. By moving the second movable component, the distance between the first measuring instrument and the second measuring instrument can be adapted to the inner hole or outer diameter to be measured, so as to correspond to the measurement requirements of different inner holes or outer diameters.

[0010] In a preferred embodiment, the connecting rod has a hollow area inside, a measuring instrument is disposed at one end of the connecting rod, and the measuring instrument head is located in the hollow area inside the connecting rod. A first moving member and two springs with the same deformation are disposed in the hollow area on both sides of the first moving member, and one side of the first moving member is in contact with the measuring instrument head.

[0011] In a preferred embodiment, the first moving member includes a sliding part with a shape adapted to the hollow region and columnar parts on both sides of the sliding part. The size of the sliding part is larger than the diameter of the spring and the columnar parts are adapted to the inner diameter of the spring. An opening slot is provided in the hollow region. The sliding part is connected to a pull rod, which passes through the opening slot. The columnar parts can penetrate into the inner hole of the spring to abut against the meter head and guide the spring to deform along the moving direction of the first moving member.

[0012] In a preferred embodiment, both the first and second measuring instruments include a measuring claw and a measuring head, with the measuring heads being completely identical. The measuring head and the measuring claw are detachably connected, and the measuring claw is detachably connected to either the first or second moving part. A moving groove is provided on the connecting rod, and the moving groove is provided corresponding to the hollow area. One end of the measuring claw of the first measuring instrument is provided with a moving part, which passes through the moving groove and is connected to the sliding part.

[0013] In a preferred embodiment, the moving part is provided with a connecting hole, and the sliding part is provided with a fixing hole. After the moving part passes through the moving groove and the connecting hole corresponds to the fixing hole, a bolt connection is used.

[0014] In a preferred embodiment, the second movable component includes a clamp sleeved on the connecting rod, the clamp's fastening bolts being loosened to allow the clamp to move on the connecting rod, and the clamp's fastening bolts being tightened to fix the clamp relative to the connecting rod.

[0015] In a preferred embodiment, the measuring claw is provided with a connecting part, which is provided with a vertical hole and a horizontal hole that are connected. The measuring head is provided with a positioning rod and a measuring head. After the positioning rod is inserted into the vertical hole, a bolt is installed in the horizontal hole to abut against the positioning rod and fix the measuring head.

[0016] In the preferred implementation, the measuring head is round.

[0017] In a preferred implementation, the connecting rod is provided with scale markings so that the second moving part can quickly adjust its position to correspond to the outer circle or inner hole diameter to be measured.

[0018] The above structure has the following beneficial effects:

[0019] By cooperating with the first and second moving parts, this method can adapt to the measurement requirements of different inner or outer diameters, eliminating the need for multiple gauges and reducing gauge purchase and management costs. Traditional methods result in long inspection times due to frequent gauge switching. This solution, by moving the second moving part, can quickly adjust the distance between the first and second gauges to suit the measured dimension, reducing operation steps and time, and improving production efficiency. The simplified operation process and ease of understanding of this application lower the skill requirements for inspection personnel, facilitating widespread adoption. Attached Figure Description

[0020] The accompanying drawings, which are included to provide a further understanding of the present invention and constitute a part of this invention, illustrate exemplary embodiments of the present invention and, together with the description thereof, serve to explain this application and do not constitute an undue limitation of the present invention. In the drawings:

[0021] Figure 1 A schematic structural diagram of the inspection tool of this application is shown;

[0022] Figure 2 A schematic, partially enlarged view of the inspection tool of this application is shown;

[0023] Figure 3 A schematic three-dimensional structural diagram of the first measuring claw of this application is shown;

[0024] Figure 4 A schematic cross-sectional view of the workpiece to be inspected is shown.

[0025] Label Explanation:

[0026] 1. Connecting rod; 10. Hollow area; 11. Spring; 12. Moving groove; 2. Measuring gauge; 20. Measuring head; 3. First moving part; 30. Sliding part; 31. Columnar part; 32. Pull rod; 4. Second moving part; 5. First measuring tool; 50. First measuring claw; 500. Moving part; 5000. Connecting hole; 501. Connecting part; 5010. Vertical hole; 5011. Horizontal hole; 51. First probe; 510. Positioning rod; 511. Probe; 6. Second measuring tool; 60. Second measuring claw; 61. Second probe; 7. Workpiece; 70. Inner circular surface; 71. Outer circular surface. Detailed Implementation

[0027] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit and scope of this invention. Therefore, the drawings and description are considered exemplary in nature and not restrictive.

[0028] In the description of this utility model, it should be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," and "circumferential," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. In this utility model, unless otherwise expressly specified and limited, the first feature being "upper" or "lower" than the second feature can mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium.

[0029] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral unit; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. However, specifying a direct connection indicates that the two main bodies at the connection point are not connected by an intermediate structure, but are simply connected to form a whole through a connecting structure. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0030] In this utility model, descriptions involving "first," "second," etc., are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature.

[0031] The present invention will now be described with reference to the accompanying drawings.

[0032] The specific solution adopted is as follows:

[0033] like Figure 1-4 As shown, this utility model provides a novel spring gauge for measuring the diameter of an inner hole or outer circle, comprising:

[0034] Connecting rod 1, on which a measuring gauge 2 is installed;

[0035] The first moving part 3 is configured to move a short distance along the length direction of the connecting rod 1. The first moving part 3 is connected to the first measuring instrument 5. Two springs 11 with the same deformation are respectively abutted on both sides of the first moving part 3. The springs 11 can deform along the moving direction of the first moving part 3 when the first moving part 3 moves. One side of the first moving part 3 is in contact with the meter head 20 of the measuring instrument 2.

[0036] The second moving part 4 is configured to move a long distance along the length direction of the connecting rod 1. The second moving part 4 is connected to the second measuring tool 6. By moving the second moving part 4, the distance between the first measuring tool 5 and the second measuring tool 6 can be adapted to the inner hole or outer diameter to be measured, so as to correspond to the measurement requirements of different inner holes or outer diameters respectively.

[0037] By adopting the gauge of this application, the first moving part 3 and the second moving part 4 can cooperate to adapt to the measurement requirements of different inner hole or outer diameter, eliminating the need for multiple gauges and reducing the purchase and management costs of gauges. Traditional methods result in long inspection times due to frequent gauge switching. This solution can quickly adjust the distance between the first measuring tool 5 and the second measuring tool 6 to adapt to the dimension to be measured by moving the second moving part 4, reducing operation steps and time, and improving production efficiency. The operation process of this application is simplified, easy to understand, and lowers the skill level requirements of the inspection personnel, making it easy to promote and use.

[0038] The principle of this application for measuring the diameter of an inner hole or outer circle is as follows: Before measuring the part to be measured, the first measuring tool 5 and the second measuring tool 6 are adjusted to a known standard distance, at which point the measuring gauge 2 will have an initial reading. The first measuring tool 5 and the second measuring tool 6 are inserted into the inner hole or outer circle to be measured, so that the first measuring tool 5 and the second measuring tool 6 respectively contact the opposite side wall of the inner hole or outer circle to be measured. For example, when measuring the inner circle diameter, they are pressed against the inner circle wall, and the reading of the measuring gauge 2 during measurement is compared with the initial reading at the standard distance. If the reading of the measuring gauge 2 during measurement is larger than the initial reading, it means that the first moving part 3 has moved a certain distance in the direction of the measuring gauge 2, and the spring 11 is compressed. At this time, the diameter to be measured is larger than the standard distance, and the displacement needs to be added to the standard distance to obtain the actual diameter; conversely, if the reading of the measuring gauge 2 during measurement is smaller than the initial reading, it means that the first moving part 3 has moved a certain distance away from the measuring gauge 2, and the spring 11 is stretched. At this time, the diameter to be measured is smaller than the standard distance, and the displacement needs to be subtracted from the standard distance to obtain the actual diameter.

[0039] join Figure 1 and Figure 2The connecting rod 1 has a hollow area 10 inside. A measuring gauge 2 is located at one end of the connecting rod 1, with its gauge head 20 situated within the hollow area 10. A first moving part 3 and two springs 11 with identical deformation on either side are located within the hollow area 10. One side of the first moving part 3 contacts the gauge head 20 of the measuring gauge 2. The components are concealed inside the connecting rod 1, making the entire fixture more compact and reducing the space occupied. This is highly advantageous for use in space-constrained work environments, facilitating carrying and use by operators.

[0040] See Figure 1 and Figure 2 The first moving member 3 includes a sliding part 30 whose shape is adapted to the hollow region 10, and columnar parts 31 on both sides of the sliding part 30. The size of the sliding part 30 is larger than the diameter of the spring 11, and the columnar parts 31 are adapted to the inner diameter of the spring 11. The hollow region 10 has an opening slot. The sliding part 30 is connected to a pull rod 32, which passes through the opening slot. The columnar parts 31 can penetrate into the inner hole of the spring 11, abut against the meter head 20 of the measuring instrument 2, and guide the spring 11 to deform along the moving direction of the first moving member 3, avoiding irregular deformation of the spring 11 in other directions (such as lateral offset, twisting, etc.). This precise deformation control ensures that the reading of the measuring instrument 2 can accurately reflect the displacement of the first moving member 3, thereby improving the measurement accuracy.

[0041] See Figure 1 and Figure 3 Both the first measuring tool 5 and the second measuring tool 6 include a measuring claw and a measuring head 511. The measuring heads 511 of the two are completely identical. The measuring head 511 and the measuring claw are detachably connected. The measuring claw is provided with a connecting part 501. The connecting part 501 is provided with a vertical hole 5010 and a horizontal hole 5011. The measuring head 511 is provided with a positioning rod 510 and a measuring head 511 part. After the positioning rod 510 is inserted into the vertical hole 5010, a bolt is installed in the horizontal hole 5011 to abut against the positioning rod 510 and fix the measuring head 511. The measuring claw is detachably connected to the first moving part 3 or the second moving part 4. The connecting rod 1 has a moving groove 12, which is opened corresponding to the hollow area 10. One end of the measuring claw of the first measuring tool 5 is provided with a moving part 500, which passes through the moving groove 12 and is connected to the sliding part 30. The moving part 500 is provided with a connecting hole 5000, and the sliding part 30 is provided with a fixing hole. After the moving part 500 passes through the moving groove 12 and the connecting hole 5000 corresponds to the fixing hole, it is connected by bolts. Side heads of different lengths and diameters can be customized according to requirements to correspond to different hole depths and diameters. Preferably, the probe 511 is circular, and the contact method between the circular side head and the inner hole or outer circle is point contact. During the measurement process, the surface of the inner hole or outer circle is not an absolutely perfect plane and may have slight protrusions or depressions. The circular probe 511 can flexibly find the highest point (or the most protruding point) on the surface of the inner hole or outer circle for contact.

[0042] In a preferred embodiment of this application, the second moving member 4 includes a clamp sleeved on the connecting rod 1. The clamp's fastening bolts can be loosened to allow the clamp to move on the connecting rod 1, and the clamp's fastening bolts can be tightened to fix the clamp relative to the connecting rod 1. Besides the clamp structure, a sleeve is also a feasible implementation. The sleeve is also sleeved on the connecting rod 1, with a hole in the sleeve and a bolt installed in the hole. When the bolt is loosened, the friction between the sleeve and the connecting rod 1 decreases, allowing the sleeve to move smoothly on the connecting rod 1. When the bolt is tightened, the threaded portion of the bolt presses tightly against the surface of the connecting rod 1, increasing the friction between the threaded portion and the connecting rod 1, thus fixing the sleeve relative to the connecting rod 1 and meeting the positional stability requirements of the second moving member 4 during measurement.

[0043] Furthermore, the connecting rod 1 may be provided with scale marks, not shown in the figure, so that the second moving part 4 can quickly adjust its position to correspond to the outer circle or inner hole diameter to be measured, thereby improving the efficiency of conversion measurement.

[0044] The specific usage method of this application is as follows: See Figure 4 , is a cross-sectional view of workpiece (brake housing) 7, which has a T-shaped groove inside. Four diameter supports need to be measured, namely the upper inner circle diameter, the outer circle diameter, and the lower inner circle diameter and the outer circle diameter.

[0045] Before using this new spring gauge for measurement, it is necessary to determine whether the object to be measured is the inner circle 70 or the outer circle 71, as there are certain differences in the operational details for different objects.

[0046] Steps for measuring internal holes

[0047] Initial setup: Adjust the first measuring tool 5 and the second measuring tool 6 to a preset standard distance between the inner holes. In this state, the measuring gauge 2 will display an initial reading, which will serve as a reference for subsequent measurements.

[0048] Insertion and contact: Insert the adjusted first measuring tool 5 and second measuring tool 6 into the inner hole to be measured, ensuring that the first measuring head 51 and the second measuring head 61 are in contact with the side wall surface of the inner hole to be measured, respectively.

[0049] Finding the highest point and reading the value: To obtain more accurate measurement results, the measuring point needs to be rotated back and forth to find the highest point on the side wall and read the value on measuring table 2 at this time.

[0050] Vertical inspection: After completing the horizontal measurement, the gauge can be raised and lowered to check whether the inner hole diameter is uniform in the vertical direction, so as to fully understand the size of the inner hole.

[0051] When the reading matches the initial reading, there are two possible scenarios: one is that the actual diameter of the inner hole is exactly equal to the standard distance; the other is that the actual diameter of the inner hole is less than the standard distance, causing the first probe 51 and the second probe 61 to fail to fully contact the side wall. In this case, the pull rod 32 needs to be pulled to move the first moving part 3 away from the measuring instrument 2 until the pull rod 32 can no longer move. At this time, the reading displayed by the measuring instrument 2 is the correct measurement reading.

[0052] Calculate the actual diameter: Compare the correct reading with the initial reading, and based on the comparison result, increase or decrease the corresponding value according to the corresponding calculation method to obtain the actual diameter of the inner hole to be measured.

[0053] Steps for measuring the outer circle

[0054] When measuring the outer diameter, most of the operations are similar to those for measuring the inner diameter. If the reading matches the initial reading, pull rod 32 should be moved towards gauge 2 until it can no longer be moved. At this point, the reading displayed on gauge 2 is the correct measurement reading. Then, the correct reading is compared with the initial reading, and the actual diameter of the outer diameter to be measured is calculated.

[0055] Measurement follow-up operations

[0056] After completing the measurement of one dimension, if other dimensions need to be measured, simply adjust the second moving part 4 to move it to the new measurement position, and then perform the fixing and measurement operations as described above. Throughout the entire measurement process, it is essential to ensure that the connecting rod 1 remains horizontal to guarantee the accuracy of the measurement results.

[0057] For any parts not mentioned in this utility model, existing technologies can be used or referenced.

[0058] The above are merely specific embodiments of this utility model, but the protection scope of this utility model is not limited thereto. Any person skilled in the art can easily conceive of various variations or substitutions within the technical scope disclosed in this utility model, and these should all be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A novel spring gauge for measuring the diameter of an inner hole or outer circle, characterized in that, include: A connecting rod, on which a measuring instrument is installed; A first movable member is configured to move a short distance along the length of the connecting rod. The first movable member is connected to a first measuring instrument. Two springs with the same deformation are respectively abutted on both sides of the first movable member. The springs can deform along the moving direction of the first movable member when the first movable member moves, and one side of the first movable member is in contact with the meter head of the measuring instrument. The second movable component is configured to move a long distance along the length of the connecting rod. The second movable component is connected to a second measuring instrument. By moving the second movable component, the distance between the first measuring instrument and the second measuring instrument can be adapted to the inner hole or outer diameter to be measured, so as to correspond to the measurement requirements of different inner holes or outer diameters.

2. The novel spring gauge for measuring the diameter of an inner hole or outer circle according to claim 1, characterized in that, The connecting rod has a hollow area inside. A measuring instrument is set at one end of the connecting rod, and the measuring head of the measuring instrument is located in the hollow area inside the connecting rod. A first moving part and two springs with the same deformation are abutting each other on both sides in the hollow area. One side of the first moving part is in contact with the measuring head of the measuring instrument.

3. The novel spring gauge for measuring the diameter of an inner hole or outer circle according to claim 2, characterized in that, The first moving part includes a sliding part with a shape adapted to the hollow area and columnar parts on both sides of the sliding part. The size of the sliding part is larger than the diameter of the spring and the columnar parts are adapted to the inner diameter of the spring. An opening slot is provided in the hollow area. The sliding part is connected to a pull rod, which passes through the opening slot. The columnar parts can be inserted into the inner hole of the spring to abut against the meter head and guide the spring to deform along the moving direction of the first moving part.

4. The novel spring gauge for measuring the diameter of an inner hole or outer circle according to claim 3, characterized in that, Both the first and second measuring instruments include a measuring claw and a measuring head. The measuring heads of the two instruments are completely identical. The measuring head and the measuring claw are detachably connected. The measuring claw is detachably connected to the first or second moving part. The connecting rod has a moving groove, which is opened in the hollow area. One end of the measuring claw of the first measuring instrument is provided with a moving part, which passes through the moving groove and is connected to the sliding part.

5. The novel spring gauge for measuring the diameter of an inner hole or outer circle according to claim 4, characterized in that, The moving part is provided with a connecting hole, and the sliding part is provided with a fixing hole. After the moving part passes through the moving groove and the connecting hole corresponds to the fixing hole, it is connected by bolts.

6. The novel spring gauge for measuring the diameter of an inner hole or outer circle according to claim 1, characterized in that, The second movable component includes a clamp sleeved on the connecting rod. The clamp's fastening bolts are loosened to allow the clamp to move on the connecting rod, and the clamp's fastening bolts are tightened to fix the clamp relative to the connecting rod.

7. The novel spring gauge for measuring the diameter of an inner hole or outer circle according to claim 4, characterized in that, The measuring claw is equipped with a connecting part, which has a vertical hole and a horizontal hole that connect it. The measuring head is equipped with a positioning rod and a measuring head. After the positioning rod is inserted into the vertical hole, a bolt is installed in the horizontal hole to abut against the positioning rod and fix the measuring head.

8. The novel spring gauge for measuring the diameter of an inner hole or outer circle according to claim 6, characterized in that, The head is round.

9. The novel spring gauge for measuring the diameter of an inner hole or outer circle according to claim 4, characterized in that, The connecting rod is provided with scale markings so that the second moving part can quickly adjust its position according to the scale markings to correspond to the outer circle or inner hole diameter to be measured.

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