Portable movable measuring bridge
By modifying a large vernier caliper into a portable, movable measuring bridge, the problem of on-site measurement of large-sized parts was solved, achieving flexible, efficient, and low-cost accurate measurement. It is suitable for measuring features such as inner diameter, outer diameter, spacing, roundness, and runout.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- SHANGHAI SPACEFLIGHT ELECTRONICS & COMM EQUIP RES INST
- Filing Date
- 2026-03-26
- Publication Date
- 2026-06-09
Smart Images
Figure CN122170723A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of instrument testing technology, and in particular to a portable, movable measuring bridge ruler. Background Technology
[0002] Whether a machined part meets the technical requirements of the design drawings needs to be determined by using appropriate measuring instruments and methods for measurement or inspection. Testing involves comparing the measured object with a standard quantity of a reproducible unit of measurement to determine the value of the measured object. Inspection determines whether the measured object is within specified limits without necessarily providing its specific numerical value.
[0003] Important parts such as gears and turntable bases require re-inspection of their main characteristics before warehousing. Features such as deep inner hole diameters and tooth surface runout cannot be measured on-site using ordinary measuring tools and are typically measured using a coordinate measuring machine (CMM). However, CMMs are fixed equipment, and the large size and weight of these parts make it difficult to move them smoothly to the CMM room. Furthermore, CMM measurement is expensive. In addition, these parts cannot be moved as a whole after assembly on the product. If a malfunction occurs at this point, it is best to re-inspect their characteristics on-site. Disassembling parts such as gears and turntable bases for CMM measurement would result in a significant waste of manpower, materials, and financial resources. Articulated arms and laser trackers are mobile measuring devices, but their widespread use and complex operation make them unsuitable for the scenarios of re-inspection of these parts upon warehousing or on-site after assembly. Summary of the Invention
[0004] The purpose of this invention is to overcome the shortcomings of existing technologies and provide a portable, movable measuring bridge ruler, comprising: The guide rail is modified from the main scale of a large vernier caliper; Two support modules are respectively disposed at both ends of the guide rail. Each support module includes a slider modified from the micro-motion frame of a large vernier caliper, and a pad assembly disposed at the bottom of the slider for adjusting the support height. The support module is configured to stably support the guide rail on the surface of the object being measured. A measuring head module is slidably mounted on the guide rail; the measuring head module is configured to abut against one end of the surface of the object being measured to form a measuring reference. A dial indicator module is slidably mounted on the guide rail; the dial indicator module is configured to cooperate with the measuring head module to obtain the shape and position measurement values of the object being measured.
[0005] Furthermore, the pad assembly includes at least one pad; the pad has a shaft-like structure, the upper half of the pad is a threaded section for connecting with a slider or other pads; the lower half of the pad is a cylindrical support section; and the bottom of the pad is provided with a threaded hole for connecting with other pads. The cylindrical support section has a knurled pattern on its side.
[0006] Furthermore, the pad assembly includes several small pads and several large pads, wherein the support section height and diameter of the large pads are greater than those of the small pads.
[0007] Furthermore, the measuring head module includes a slider, a bracket, and a measuring ball head. The bracket is disposed at the bottom of the slider, and the measuring ball head is disposed at the bottom of the bracket for abutting against the surface of the object being measured. The bracket is a shaft-like structure, with a threaded section in the upper part that can be screwed into the bottom of the slider; the lower part is a long cylindrical section; the side of the long cylindrical section is machined with knurled texture, and a threaded hole is machined at the bottom; The measuring ball head has a rotating structure, with a threaded section at the top that can be screwed onto the bottom of the bracket, a slender cylindrical section in the middle, and a sphere at the bottom.
[0008] Furthermore, the measuring ball head is detachable and replaceable, and its total runout tolerance is less than 0.005 mm.
[0009] Furthermore, the dial indicator module includes a slider, a transition block, and a lever dial indicator. The transition block is disposed at the bottom of the slider, and the lever dial indicator is mounted at an angle on the transition block.
[0010] Furthermore, the transition block has a cuboid structure, with a countersunk hole machined on the lower surface, a 15° oblique through hole machined on the side, and a threaded hole machined on the front that intersects with the 15° oblique through hole; The transition block is mounted on the bottom of the slider through a countersunk hole; the lever dial indicator is mounted on the transition block through a 15° oblique through hole on the side and is fixed with a set screw through the front threaded hole.
[0011] Furthermore, the support module, the measuring head module, and the dial indicator module are all slidably engaged with the guide rail via the slider, and the set screw is provided to fix the slider on the guide rail.
[0012] Compared with the prior art, the beneficial effects of the present invention are: 1. The portable movable measuring bridge ruler of the present invention has the advantages of being lightweight and easy to carry. It can be used for on-site measurement and inspection of parts that are large in size or weight, difficult to transport, or already assembled, making it flexible and efficient.
[0013] 2. The main body of the portable movable measuring bridge ruler of this invention is modified from a large vernier caliper, which is not difficult to manufacture and has a low cost.
[0014] 3. The portable movable measuring bridge ruler of this invention has a wide range of applications, especially for the characteristics that are relatively limited when using ordinary measuring tools, including geometrical elements such as inner diameter, outer diameter, spacing, roundness, and runout; it has high accuracy and the measurement method is accurate and reliable. Attached Figure Description
[0015] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used together with the embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram of a portable, movable measuring bridge ruler. Figure 2 This is a schematic diagram of the guide rail structure; Figure 3 This is a schematic diagram of the supporting module structure; Figure 4 This is a schematic diagram of the slider structure; Figure 5 This is a schematic diagram of the measuring head module structure; Figure 6 This is a schematic diagram of the dial indicator module structure; Figure 7 This is a schematic diagram of the transition block structure; Figure 8 This is a schematic diagram of the bridge gauge calibration process; Figure 9 A schematic diagram for measuring the gear inner diameter tolerance with a bridge gauge; Figure 10 A schematic diagram for measuring gear tooth surface runout using a bridge ruler.
[0016] Figure Labels 1: Guide rail; 2: Set screw; 3: Slider; 4: Large pad; 5: Bracket; 6: Measuring ball head; 7: Lever micrometer; 8: Transition block; 9: Small pad; 10: Outside diameter spiral micrometer; 11: Gear. Detailed Implementation
[0017] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
[0018] To keep the drawings concise, only the parts relevant to the invention are shown schematically in each figure, and they do not represent the actual structure of the product. Furthermore, for ease of understanding, in some figures, only one of components with the same structure or function is shown schematically, or only one is labeled. In this document, "one" can mean not only "only one" but also "more than one".
[0019] First Embodiment Please see Figure 1-10 The technical solution of a portable and movable measuring bridge ruler provided in this embodiment includes the following: This invention consists of guide rail 1 (see Figure 2 ), support module (see Figure 3 ), measuring head module (see Figure 5 ) and the dial indicator module (see Figure 6 This invention comprises components that allow for on-site measurement and inspection of large, heavy, difficult-to-handle, or already assembled parts. It is particularly effective for measuring features where conventional measuring tools are often limited, including geometrical elements such as inner diameter, outer diameter, spacing, roundness, and runout. This invention offers advantages such as simple manufacturing, low cost, portability, wide applicability, and high measurement accuracy.
[0020] like Figure 2 As shown, guide rail 1 is modified from the main scale of a large vernier caliper by cutting off the front end.
[0021] like Figure 3 As shown, the support module consists of slider 3, set screw 2, small pad 9, and large pad 4. Slider 3 is modified from the micro-motion frame of a large vernier caliper by cutting off the lower part and machining a threaded hole on the lower end face (see...). Figure 4 Small pad 9 and large pad 4 can be selected as needed and stacked at the bottom of slider 3. By rotating the bottom pad, any height can be selected within a certain range.
[0022] like Figure 5 As shown, the measuring head module consists of a slider 3, a set screw 2, a bracket 5, and a measuring ball head 6. The measuring ball head 6 can be replaced with other ball heads of different diameters to suit different measuring environments.
[0023] like Figure 6 As shown, the dial indicator module consists of a slider 3, a set screw 2, a transition block 8, and a lever dial indicator 7. The transition block 8 is used to install and fix the lever dial indicator 7 together with the slider 3 at the bottom. The structure of the transition block 8 is as follows: Figure 7 As shown.
[0024] The following is a detailed description of the measurement and inspection of the inner diameter tolerance and tooth surface runout of gear 11. The specific operation steps are as follows.
[0025] When measuring and inspecting the inner diameter of gear 11: Step 1: Based on the theoretical value of the inner diameter of gear 11, use an outside diameter screw micrometer 10 to calibrate and measure the distance between the ball head 6 and the lever micrometer 7. At this time, rotate the dial of the lever micrometer 7 to bring the needle to zero, and tighten the measuring head module and the micrometer module. Figure 8 As shown.
[0026] Step 2: Slide the support module and place the bridge gauge on the uppermost surface of gear 11. Install 3 large pads 4 on each of the two support modules as needed. Rotate the lowermost large pad 4 to ensure that the bridge gauge sits stably on the surface of the object to be measured through the support modules at both ends. Tighten the two support modules.
[0027] Step 3: As Figure 9 As shown, keep the measuring ball head 6 close to the end of the surface to be measured and keep it still. Slightly rotate the guide rail 1 to ensure that the lever dial indicator 7 is in the pushed state. Observe the change of the value of the lever dial indicator 7. At this time, the minimum value is the actual measured value of the inner diameter.
[0028] Step 4: Take 4 points evenly along the circumference and repeat the steps in Step 3 to obtain the measured values of the gear's inner diameter in 4 directions. Ensure that all 4 values are within the inner diameter tolerance range before the inspection is qualified.
[0029] When measuring and inspecting the runout of gear 11 tooth surface with the inner diameter as the reference: Step 1: Readjust the positions of each module on the bridge gauge guide rail 1, and slide the measuring head module to the far left, such as... Figure 10 As shown.
[0030] Step 2: Slide the support module and place the bridge gauge on the uppermost surface of gear 11. Depending on the situation, install two large pads 4 and one small pad 9 on each of the two support modules. Rotate the bottom large pad 4 to ensure that the bridge gauge sits stably on the surface of the object to be measured through the support modules at both ends. Tighten the two support modules.
[0031] Step 3: Position the measuring ball head 6 between the two tooth surfaces, keep it still, and tighten the measuring head module.
[0032] Step 4: Slide the dial indicator 7 module so that the dial indicator 7 contacts the inner diameter of the gear 11 and slightly rotate the guide rail 1 to find the minimum value state, and ensure that the dial indicator 7 head is in the pushed state. At this time, rotate the dial to make the needle zero position and tighten the dial indicator module.
[0033] Step 5: Randomly change to another position, place the measuring ball 6 between the two tooth surfaces, keep it still, and slightly rotate the guide rail 1 to ensure that the dial indicator 7 is in the pushed state. Observe the change in the value of the dial indicator 7. At this time, the minimum value is the jump value at that point.
[0034] Step Six: Take 8 points evenly along the circumference and repeat Step Four and Step Five to obtain the runout value of the gear tooth surface 11 with the inner diameter as the reference. Only when all 8 values are within the runout tolerance range can the inspection be qualified.
[0035] Finally, it should be noted that the above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.
Claims
1. A portable, movable measuring bridge ruler, characterized in that, include: The guide rail is modified from the main scale of a large vernier caliper; Two support modules are respectively disposed at both ends of the guide rail. Each support module includes a slider modified from the micro-motion frame of a large vernier caliper, and a pad assembly disposed at the bottom of the slider for adjusting the support height. The support module is configured to stably support the guide rail on the surface of the object being measured. A measuring head module is slidably mounted on the guide rail; the measuring head module is configured to abut against one end of the surface of the object being measured to form a measuring reference. A dial indicator module is slidably mounted on the guide rail; the dial indicator module is configured to cooperate with the measuring head module to obtain the shape and position measurement values of the object being measured.
2. The portable movable measuring bridge ruler according to claim 1, characterized in that, The pad assembly includes at least one pad; the pad has a shaft-like structure, the upper half of the pad is a threaded section for connecting with a slider or other pads; the lower half of the pad is a cylindrical support section; the bottom of the pad is provided with a threaded hole for connecting with other pads; The cylindrical support section has a knurled pattern on its side.
3. The portable movable measuring bridge ruler according to claim 2, characterized in that, The pad assembly includes several small pads and several large pads, wherein the support section of the large pad has a greater height and diameter than the small pads.
4. The portable movable measuring bridge ruler according to claim 1, characterized in that, The measuring head module includes a slider, a bracket, and a measuring ball head. The bracket is located at the bottom of the slider, and the measuring ball head is located at the bottom of the bracket for abutting against the surface of the object being measured. The bracket is a shaft-like structure, with a threaded section in the upper part that can be screwed into the bottom of the slider; the lower part is a long cylindrical section; the side of the long cylindrical section is machined with knurled texture, and a threaded hole is machined at the bottom; The measuring ball head has a rotating structure, with a threaded section at the top that can be screwed onto the bottom of the bracket, a slender cylindrical section in the middle, and a sphere at the bottom.
5. The portable movable measuring bridge ruler according to claim 4, characterized in that, The measuring ball head is detachable and replaceable, and its total runout tolerance is less than 0.005mm.
6. The portable movable measuring bridge ruler according to claim 1, characterized in that, The dial indicator module includes a slider, a transition block, and a lever dial indicator. The transition block is located at the bottom of the slider, and the lever dial indicator is mounted at an angle on the transition block.
7. The portable movable measuring bridge ruler according to claim 6, characterized in that, The transition block has a cuboid structure, with a countersunk hole machined on the lower surface, a 15° oblique through hole machined on the side, and a threaded hole that intersects with the 15° oblique through hole machined on the front. The transition block is mounted on the bottom of the slider through a countersunk hole; the lever dial indicator is mounted on the transition block through a 15° oblique through hole on the side and is fixed with a set screw through the front threaded hole.
8. The portable movable measuring bridge ruler according to claim 1, characterized in that, The support module, the measuring head module, and the dial indicator module are all slidably engaged with the guide rail via the slider, and the set screw is provided to fix the slider on the guide rail.