Octagonal slot dimension measuring device

Abstract

This utility model discloses an octagonal groove dimension measuring device. In this device, positioning balls on a first and second positioning ring are respectively placed on the left and right sides of the octagonal groove. Simultaneously, the second positioning ring is locked by a positioning component. One of the positioning balls is moved circumferentially along the octagonal groove until the dial indicator displays the maximum value. This value, plus the distance between the centers of the two positioning balls, is the mean diameter of the octagonal groove. This device is ingeniously designed, easy to use, and highly accurate, effectively reducing the difficulty of measuring the dimensions of octagonal grooves and greatly improving the measurement efficiency after octagonal groove machining.

Description

Technical Field

[0001] This utility model relates to the field of measuring instruments, and in particular to an octagonal groove dimension measuring device. Background Technology

[0002] Octagonal groove seals are widely used in industries such as petrochemicals, shipbuilding, nuclear power, and heavy machinery. Their primary function is sealing, maintaining excellent sealing performance even under high temperature and pressure conditions. The sealing performance remains stable under fluctuating pressure and temperature conditions. An octagonal groove seal structure refers to an annular groove with a 23° inverted trapezoidal cross-section machined on both sides of the sealing surface of the equipment; this annular groove is called an octagonal groove (see appendix). Figure 1 When using an octagonal gasket, a special octagonal gasket is placed in the annular groove. Under the pre-tightening force of the bolts, the octagonal gasket deforms, filling the uneven gaps on the sealing surface, thus effectively preventing pipeline leaks. Octagonal gaskets are usually made of metal, possessing good corrosion resistance and wear resistance, and can be used for extended periods in harsh environments. Therefore, the dimensional accuracy of the octagonal groove required for installing the gasket directly affects the sealing effect. Currently, there are relatively few dedicated measuring tools available in China for measuring machined octagonal grooves. The current method for measuring the center circle diameter of an octagonal groove involves placing two steel balls in the groove, measuring the outer diameter between the two balls with vernier calipers, and then subtracting the diameter of one of the steel balls to calculate the center circle diameter. During measurement, one person holds the steel balls and fixes them in the octagonal groove, while another person uses vernier calipers to measure the distance between the two steel balls, especially when measuring small-diameter octagonal grooves. The smaller the diameter of the octagonal groove, the smaller the tolerance range, increasing the difficulty of measurement and requiring more sophisticated measuring tools. Therefore, a dedicated octagonal groove measuring device is particularly important. Utility Model Content

[0003] The purpose of this invention is to replace the traditional method of measuring the diameter of the center circle of the octagonal groove by placing two steel balls in the octagonal groove, measuring the outer diameter between the two steel balls with a vernier caliper, and then subtracting the diameter of one of the steel balls. This method can accurately measure the size of the octagonal groove after processing, reduce the errors generated during the measurement process, and provide favorable technical support for the processing and measurement of octagonal grooves.

[0004] The technical solution adopted in this utility model is as follows: An octagonal groove dimension measuring device includes a dial indicator and a ruler. A first positioning ring and a second positioning ring are sleeved on the ruler, and both the first and second positioning rings are slidably connected to the ruler. A positioning component is provided on the first positioning ring, and a positioning assembly is provided on the second positioning ring. Positioning balls are provided on both the first and second positioning rings. An assembly hole is opened at one end of the ruler. The measuring rod sleeve of the dial indicator is located in the assembly hole and fixed to the ruler. A groove is opened on the ruler at the location of the assembly hole. The positioning component is located inside the groove and contacts the measuring head of the dial indicator.

[0005] A further technical solution is that the positioning ball is connected to the first positioning ring or the second positioning ring via a screw.

[0006] A further technical solution is that a first threaded hole is opened radially on the ruler rod, and a first set screw is provided inside the first threaded hole, which presses against the measuring rod sleeve of the dial indicator.

[0007] A further technical solution is that the positioning component includes a second threaded hole on the second positioning ring, and a second set screw is provided inside the second threaded hole, which tightens the ruler rod.

[0008] In summary, due to the adoption of the above technical solution, the beneficial effects of this utility model are: 1. In this utility model, by placing the positioning balls on the first positioning ring and the second positioning ring on the left and right sides of the octagonal groove respectively, and locking the second positioning ring by the positioning component, one of the positioning balls is moved along the circumferential direction of the octagonal groove until the dial indicator displays the maximum value. This value plus the distance between the centers of the two positioning balls is the mean diameter of the octagonal groove.

[0009] 2. This device is ingeniously designed, easy to use, and has high measurement accuracy, effectively reducing the difficulty of measuring the dimensions of the octagonal groove and greatly improving the measurement efficiency after the octagonal groove is processed.

[0010] 3. A comparison of the measurement data from the two methods is shown in Table 1. Table 1 Comparison of the two measurement results Serial Number 1 2 3 Drawings require dimensions 149.23±0.13 193.68±0.13 247.65±0.13 Traditional measurement results 149.15 193.63 247.69 Measurement results from this device 149.19 193.70 247.63 Attached Figure Description

[0011] Figure 1 This is a schematic diagram of an octagonal groove structure. Figure 2 This is a schematic diagram of the overall structure of this utility model. Figure 3 This is a schematic diagram showing the location of the slot in this utility model. Figure 4 This is a schematic diagram of the structure in which the positioning ball is connected to the first positioning ring or the second positioning ring via a screw. Detailed Implementation

[0012] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments.

[0013] Example 1 like Figure 1-4 As shown, an octagonal groove dimension measuring device is characterized by comprising a dial indicator 1 and a ruler 2. A first positioning ring 3 and a second positioning ring 4 are fitted onto the ruler 2, and both the first positioning ring 3 and the second positioning ring 4 are slidably connected to the ruler 2. A positioning component 5 is provided on the first positioning ring 3, and a positioning assembly is provided on the second positioning ring 4. Positioning balls 6 are provided on both the first positioning ring 3 and the second positioning ring 4. An assembly hole 7 is provided at one end of the ruler 2. The measuring rod sleeve 9 of the dial indicator 1 is located within the assembly hole 7 and fixed to the ruler 2. A groove 8 is provided on the ruler 2 at the location of the assembly hole 7. The positioning component 5 is located inside the groove 8 and contacts the measuring head 10 of the dial indicator 1. The first positioning ring 3 and the second positioning ring 4 are of equal size and shape. The size of the positioning balls 6 is determined by the width of the octagonal groove. The positioning component 5 is a positioning bolt threaded onto the first positioning ring 3.

[0014] The first positioning ring 3 and the second positioning ring 4 are both made of round steel, with a thickness of 3-6mm and a width of 4-10mm. Two positioning threaded holes of M2-M6 are machined at symmetrical positions in the middle of each ring. The positioning ball 6 is made of steel ball, with a bolt hole of M2-M6 depth of 5mm machined at one point. The ruler 2 is made of φ14-φ22 round steel, with a φ8 round hole of about 30mm in length machined at the left end for the assembly of the dial indicator 1. The first threaded hole of M2-M8 is machined on the ruler 2. A groove 8 of about 50mm in length is milled on the ruler 2 according to the size of the positioning component 5 so that the positioning component 5 can contact the probe of the dial indicator 1.

[0015] The positioning ball 6 is connected to the first positioning ring 3 or the second positioning ring 4 by a screw. Both the positioning ball 6 and the first positioning ring 3 have bolt holes that are compatible with the screw. The screw is first connected to the first positioning ring 3, and then the positioning ball 6 is connected to the screw.

[0016] A first threaded hole is opened radially on the ruler 2, and a first set screw 11 is provided inside the first threaded hole. The first set screw 11 tightens the measuring rod sleeve 9 of the dial indicator 1.

[0017] The positioning component includes a second threaded hole on the second positioning ring 4, and a second set screw 12 is provided inside the second threaded hole, which tightens the ruler rod 2.

[0018] The procedure for using this device is as follows: 1. Assemble the dial indicator 1 and the ruler 2, and fix them with the first set screw 11.

[0019] 2. Assemble the first positioning ring 3, positioning component 5, and positioning ball 6 together and install them on the left side of the ruler 2. The positioning component 5 is connected to the dial indicator 11 pin. The first positioning ring 3 can move on the ruler 2, and the positioning component 5 moves inside the groove 8 accordingly.

[0020] 3. Assemble the second positioning ring 4 and another positioning ball 6 together and attach them to the right side of the ruler 2, and fix them with the second set screw 12.

[0021] 4. Move one of the positioning balls 6 on the first positioning ring 3 and the second positioning ring 4 along the circumferential direction of the octagonal groove until the dial indicator 1 displays the maximum value. Take the reading through the dial indicator 1 and read the scale value on the ruler 2. The scale value on the ruler 2 is the distance (inner side) between the first positioning ring 3 and the second positioning ring 4. The scale value on the ruler 2 plus the width of the first positioning ring 3 is the distance between the centers of the two positioning balls 6. The distance between the centers of the two positioning balls 6 plus the value of the dial indicator 1 is the measured mean diameter of the octagonal groove.

[0022] The octagonal groove measuring device effectively reduces the measurement difficulty for operators and improves the machining accuracy and work efficiency of octagonal grooves.

[0023] The above description is only a preferred embodiment of this utility model.

Claims

1. An octagonal groove dimension measuring device, characterized in that, The instrument includes a dial indicator (1) and a ruler (2). The ruler (2) is fitted with a first positioning ring (3) and a second positioning ring (4), and both the first positioning ring (3) and the second positioning ring (4) are slidably connected to the ruler (2). The first positioning ring (3) is provided with a positioning component (5), and the second positioning ring (4) is provided with a positioning assembly. Both the first positioning ring (3) and the second positioning ring (4) are provided with positioning balls (6). One end of the ruler (2) is provided with an assembly hole (7). The measuring rod sleeve (9) of the dial indicator (1) is located in the assembly hole (7) and fixed to the ruler (2). The ruler (2) has a slot (8) at the location of the assembly hole (7). The positioning component (5) is located inside the slot (8) and is in contact with the measuring head (10) of the dial indicator (1).

2. The octagonal groove dimension measuring device according to claim 1, characterized in that, The positioning ball (6) is connected to the first positioning ring (3) or the second positioning ring (4) by a screw.

3. The octagonal groove dimension measuring device according to claim 1, characterized in that, The ruler rod (2) has a first threaded hole in the radial direction, and a first set screw (11) is provided inside the first threaded hole. The first set screw (11) presses against the measuring rod sleeve (9) of the dial indicator (1).

4. The octagonal groove dimension measuring device according to claim 1, characterized in that, The positioning component includes a second threaded hole on the second positioning ring (4), and a second set screw (12) is provided inside the second threaded hole. The second set screw (12) tightens the ruler rod (2).

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