Device for preparing positioning key pin hole in inner wall of container

Abstract

The invention belongs to a positioning device, and particularly relates to a device for preparing a positioning key pin hole in the inner wall of a container. The device comprises a bottom plate, a connecting plate is arranged on the bottom plate, the bottom plate and the connecting plate form a T-shaped structure, a fixing mechanism is arranged on the connecting plate, and an anti-sliding mechanism and an adjusting mechanism are arranged on the side, opposite to the connecting plate, of the bottom plate. The magnetic drill has the remarkable effects that (1) the magnetic drill has the characteristics of high drilling precision, small size and large adsorption force; the fixing device is made of Q235B steel, materials are common and easy to purchase, the structure is simple, manufacturing is easy, and the manufacturing cost of the drilling tool is reduced; (3) the fixing device is combined with the actual site situation, bolt connection is utilized, the mounting frame is simple in structure, efficient, reliable, high in stability and convenient to operate, the auxiliary time is shortened, and the production efficiency is greatly improved; (4) the fixing device is made of Q235B steel, has enough strength and rigidity, and is simple and convenient to operate, labor-saving and safe to use; and (5) the fixing device is simple to assemble and easy to disassemble and assemble.

Description

Technical Field

[0001] The invention belongs to a positioning device, and in particular relates to a device for preparing a positioning key pin hole on the inner wall of a container. Background Art

[0002] According to the installation process requirements of the positioning key, after the position of the positioning key is determined, two Φ20mm positioning pin holes with a depth of 52.5+10mm need to be prepared on the inner wall of the container on site. The positioning pin holes and positioning pins meet the H7 / S6 matching requirements. The positioning pin holes are arranged on the arc surface of the inner wall of the container, about 400mm high from the flange surface of the container, with a small operating space, high positioning pin hole accuracy, and the pin hole drilling deviation requirement not exceeding 0.021mm, which makes the construction difficult. According to the installation experience of nuclear power plants, pneumatic drills are used for drilling holes in this working condition, but the size deviation of the drilled pin holes is large, and the positioning pin holes may not meet the design requirements after drilling, increasing the risk of unsuccessful cold installation of the subsequent positioning pins. In order to ensure the size accuracy and quality of the positioning pin holes for the positioning key, an imported magnetic base drill with good stability is used, but the positioning key material is austenitic stainless steel, which has the characteristics of high toughness, large heat capacity, and large thermal expansion coefficient, and the magnetic base drill cannot be adsorbed and fixed. Summary of the invention

[0003] The present invention aims at the defects of the prior art and provides a device for preparing a positioning key pin hole on the inner wall of a container.

[0004] The present invention is implemented as follows: a device for preparing a positioning key pin hole on the inner wall of a container, which includes a base plate, a connecting plate is arranged on the base plate, the base plate and the connecting plate form a "T"-shaped structure, a fixing mechanism is arranged on the connecting plate, and an anti-slip mechanism and an adjustment mechanism are arranged on the side of the base plate facing away from the connecting plate.

[0005] A device for preparing a positioning key pin hole on the inner wall of a container as described above, wherein a back plate is arranged on the connecting plate.

[0006] As described above, a device for preparing a positioning key pin hole on the inner wall of a container, wherein a fixing mechanism is arranged on the side wall of the bottom plate.

[0007] As described above, a device for preparing a positioning key pin hole on the inner wall of a container, wherein the adjustment mechanism is fixedly connected to the bottom plate via a fixing block.

[0008] As described above, a device for preparing a positioning key pin hole on the inner wall of a container, wherein the locking mechanism includes a fixing bolt penetrating through the connecting plate and a fixing nut matching the fixing bolt.

[0009] In the device for preparing a positioning key pin hole on the inner wall of a container as described above, a reinforcing rib is arranged between the bottom plate and the connecting plate.

[0010] As described above, a device for preparing a positioning key pin hole on the inner wall of a container, wherein the magnetic drill is arranged on the anti-slip mechanism.

[0011] The remarkable effects of the present invention are: (1) Compared with the drilling of holes by pneumatic drills in nuclear power plants, the drilling of holes by magnetic base drills has the characteristics of high precision, small size and large adsorption force. When drilling the positioning key positioning hole, the space is small and it is not easy to operate, and the drilling requires high precision (0-0.021mm). The use of this device can reduce the installation risk of subsequent cold installation of the positioning pin; (2) The fixing device adopts Q235B steel, which is common material, easy to purchase, simple in structure and easy to make, thus reducing the production cost of drilling tooling; (3) The fixing device is combined with the actual situation on site, and is connected by bolts. The mounting structure is simple, efficient and reliable, stable and easy to operate, which shortens the auxiliary time and greatly improves the production efficiency; (4) The fixing device adopts Q235B steel, which has sufficient strength and rigidity, is easy to operate, labor-saving and safe to use; (5) The fixing device is simple to assemble and easy to disassemble. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1-1 Positioning key installation diagram

[0013] Figure 1-2 Positioning key diagram

[0014] Figure 2 Schematic diagram of the fixing device with positioning key pin hole

[0015] In the figure: 1. positioning pin hole, 2. container, 3. positioning key, 4. bottom plate, 5. fixing block, 6. reinforcing rib, 7. fixing nut, 8. fixing bolt, 9. connecting plate, 10. back plate, 11. adjustment mechanism, 12. anti-slip mechanism, 13. fixing mechanism, DETAILED DESCRIPTION

[0016] A device for preparing a positioning key pin hole on the inner wall of a container includes the following components. The positioning pin drilling and fixing device is mainly composed of a fixing plate, a base plate, a fixing block, a reinforcing plate, an adjustment mechanism, a fixing nut and other components. The fixing device is fixed in the vertical direction of the supporting step using a fixing nut, and the fixing device is fixed in the horizontal direction of the supporting step using a base plate and a fixing mechanism; finally, the supporting step is fixed in the front and rear directions using an adjustment mechanism; finally, the stability of the fixing device is ensured. The device is made of Q235B. In order to prevent the device from directly contacting stainless steel and contaminating the supporting step and the positioning key, the device is painted as a whole, with a blue primer and a red topcoat; a stainless steel thin gasket is placed between the base plate and the positioning key for isolation. Before drilling the positioning pin hole, place the magnetic drill on the fixing device, start the magnetic drill, and use a dial indicator to check the runout of the device; it is found that the dial indicator reading has not changed.

[0017] (1) The fixture was first used to align the positioning key locating pin hole, and it was successful at one time. (2) The fixture can be installed repeatedly, considering the convenience of disassembly and installation of the device. (3) After the fixture was manufactured, the process verification was simulated in the field environment, and a total of 4 holes of two process keys were drilled. In order to achieve better drilling accuracy, the operator conducted a series of tests on drilling speed, cutting amount, coolant ratio and other processes during the test, and obtained the best drilling process after optimization. After the test was completed, data was measured at multiple angles at the upper, middle and lower ends of the aperture. The measurement results met the requirements and the drilling fixture achieved the expected effect. The measurement results are shown in Table 1.

[0018] Table 1 Dowel pin hole size record table

[0019] Serial number Measurement location Upper diameter(mm) Middle end diameter(mm) Lower end diameter (mm) 1 0° 20.040 20.040 20.035 2 90° 20.035 20.045 20.035 3 180° 20.030 20.045 20.035 4 270° 20.045 20.045 20.040

[0020] This drilling fixture has been successfully used to drill positioning key pin holes, and the maximum deviation of the pin holes is 0.015mm. The surface of the pin holes is smooth, meeting the design requirements.

[0021] After the fixture passed the experimental verification, the site began to drill the eight locating pin holes one by one based on the principles of safe production and quality assurance. Through the use of the fixture, the magnetic drill worked stably, and the bottom was firmly adsorbed on the bottom plate of the tooling. Finally, the drilling of the eight locating pin holes was completed. By measuring the diameter of the pin holes, all of them met the design requirements. During the drilling process, the tooling gave full play to the characteristics of safety, reliability, simple structure, and convenient operation, shortening the construction period of the locating pin hole drilling work, laying a solid foundation for the subsequent cold installation of the locating pins, and also providing a strong guarantee for the smooth implementation of the subsequent installation of the internal components of the pile.

[0022] Here is an example of a specific operation

[0023] 1) Connect the bottom plate (serial number 4), fixing block (serial number 5), reinforcing rib (serial number 6), connecting plate (serial number 9), and back plate (serial number 10) of the device into a whole;

[0024] 2) Install the above components onto the container support step;

[0025] 3) Install the fixing bolt (No. 8) of the device into the threaded hole of the container;

[0026] 4) Install the device's fixing nut (No. 7) onto the fixing bolt;

[0027] 5) Use the adjustment mechanism (No. 11) to fix the device on the positioning key;

[0028] 6) Use a fixing mechanism to fix the device;

[0029] 7) Install the magnetic drill on the device;

[0030] 8) Install the anti-slip device to fix the magnetic drill;

[0031] 9) Use a magnetic drill to drill the locating pin hole at the top of the locating key;

[0032] 10) After completing the preparation of the upper positioning pin hole, loosen the anti-slip device, move the magnetic base to drill to the lower positioning pin hole, and prepare the positioning pin hole.

[0033] The locating key locating pin hole fixing device was used for the first time to prepare the locating key pin hole. The measurement results of the prepared pin hole size showed that the fixing device had a stable structure, so that its magnetic base drill had no shaking when preparing the locating pin. The locating pin holes were all prepared and formed at one time, with a maximum size deviation of 0.018mm, which was less than the deviation requirement of 0.021mm for the hole diameter.

Claims

1. A device for preparing a positioning key pin hole on the inner wall of a container, characterized in that: The invention comprises a bottom plate (4), a connecting plate (9) is arranged on the bottom plate (4), the bottom plate (4) and the connecting plate (9) form a "T"-shaped structure, a locking mechanism is arranged on the connecting plate (9), and an anti-slip mechanism (12) and an adjustment mechanism (11) are arranged on a side of the bottom plate (4) facing away from the connecting plate (9).

2. A device for preparing a positioning key pin hole on the inner wall of a container as claimed in claim 1, characterized in that: A back plate (10) is arranged on the connecting plate (9).

3. A device for preparing a positioning key pin hole on the inner wall of a container as claimed in claim 2, characterized in that: A fixing mechanism (13) is arranged on the side wall of the bottom plate (4).

4. A device for preparing a positioning key pin hole on the inner wall of a container as claimed in claim 3, characterized in that: The adjustment mechanism (11) is fixedly connected to the bottom plate (4) via a fixing block (5).

5. A device for preparing a positioning key pin hole on the inner wall of a container as claimed in claim 4, characterized in that: The locking mechanism comprises a fixing bolt (8) penetrating the connecting plate (9) and a fixing nut (7) matching the fixing bolt (8).

6. A device for preparing a positioning key pin hole on the inner wall of a container as claimed in claim 5, characterized in that: A reinforcing rib (6) is arranged between the bottom plate (4) and the connecting plate (9).

7. A device for preparing a positioning key pin hole on the inner wall of a container as claimed in claim 6, characterized in that: The magnetic drill (14) is arranged on the anti-slip mechanism (12).

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