Sand blasting protection device for oval manhole of pressure vessel
By designing a sandblasting protection device for elliptical manholes of pressure vessels, and utilizing the combination of a fixing plate and a spring, the problem of difficult manhole cover installation was solved, and efficient production of the sandblasting process was achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- HARBIN BOILER CO LTD
- Filing Date
- 2025-05-29
- Publication Date
- 2026-05-01
AI Technical Summary
In the existing pressure vessel sandblasting process, the difficulty in installing the manhole cover and the repeated disassembly lead to reduced production efficiency.
A sandblasting protection device for an elliptical manhole of a pressure vessel was designed, including a fixing plate, a connecting rod, an adjusting bolt, a rod sleeve, a protective plate, a spring, a limiting block, and a handle. Utilizing the elliptical structural features of existing manholes, rapid protection is achieved by pushing, turning, and loosening the handle.
It simplifies the protection of manholes and improves the production efficiency of sandblasting.
Smart Images
Figure CN224182844U_ABST
Abstract
Description
An oval manhole sandblasting protection device for pressure vessels Technical Field
[0001] This utility model relates to a sandblasting protection device for an elliptical manhole of a pressure vessel, belonging to the field of pressure vessel manufacturing technology. Background Technology
[0002] Pressure vessel products often develop oxide scale on their outer surface due to heat treatment and other processes during manufacturing, or rust and other foreign matter due to long production cycles, requiring sandblasting treatment. Before sandblasting, flanges, pipes, manholes, and other openings must be sealed. Pipes and flanges can be protected with hydraulic caps or nitrogen-filled covers. Manholes, due to their internal pull-out self-sealing design, are difficult to clean because sandblasting from the outside can easily spray sand particles into the internal layers. This necessitates removing the manhole cover, cleaning, and then resealing, or filling the inside with mesh for concealment, but neither method is ideal. The installation of manhole covers is also difficult, and the repeated disassembly and reassembly caused by sandblasting reduces production efficiency.
[0003] In summary, existing pressure vessel products face technical challenges during sandblasting processes due to the difficulty in installing manhole covers, and the repeated disassembly and reassembly of manhole covers can lead to reduced production efficiency. Summary of the Invention
[0004] This utility model aims to solve the technical problem that the installation of manhole covers is difficult and repeated disassembly and reassembly of manhole covers can reduce production efficiency when sandblasting existing pressure vessel products. Therefore, it provides an elliptical manhole sandblasting protection device for pressure vessels, which includes a fixing plate, a connecting rod, an adjusting bolt, a rod sleeve, a protective plate, a spring, a limit block and a handle.
[0005] The fixing plate is fixedly installed at the front of the connecting rod. The adjusting bolt, rod sleeve, guard plate and spring are sequentially fitted onto the connecting rod from front to back. The connecting rod is provided with external threads. The adjusting bolt is threadedly connected to the connecting rod. The rod sleeve and guard plate are both slidably fitted onto the connecting rod. The guard plate is fixedly connected to the rear end of the rod sleeve. One end of the spring is fixedly connected to the guard plate. The other end of the spring is fixedly connected to the limiting block. The limiting block is fixedly installed at the rear of the connecting rod. A handle is fixedly installed at the rear end of the connecting rod.
[0006] As another improvement of this utility model, it also includes a locking block, which is installed at the front end of the guard plate and restricts the circumferential displacement of the guard plate.
[0007] As another improvement of this utility model, the guard plate is ring-shaped, and multiple locking blocks are evenly arranged along the circumference of the guard plate.
[0008] As another improvement of this utility model, the shape of the fixing plate is rectangular.
[0009] As another improvement of this utility model, the inner cross-sectional shape of the external manhole seat is elliptical, the major axis of the ellipse is A, the minor axis of the ellipse is B, and the length of the rectangular diagonal of the fixing plate is L, where L satisfies the following formula:
[0010] A≥L≥B.
[0011] As another improvement of this utility model, the thickness of the external manhole seat is D, and the length of the connecting rod is P, where P satisfies the following formula:
[0012] (D+70)cm≥P≥(D+50)cm.
[0013] As another improvement of this utility model, the protective plate is welded to the rear end of the rod sleeve, and the weld joint between the protective plate and the rod sleeve forms a sealed structure.
[0014] As another improvement of this utility model, the fixing plate is fixedly installed on the front of the connecting rod by welding.
[0015] As another improvement of this utility model, the limiting block is fixedly installed at the rear of the connecting rod by welding.
[0016] As another improvement of this utility model, a handle is welded to the rear end of the connecting rod.
[0017] The beneficial effects of this utility model are:
[0018] This utility model discloses a fixing plate for a sandblasting protection device for an elliptical manhole of a pressure vessel. Utilizing the existing elliptical structure of manholes, the device protects the manhole by pushing, turning, and releasing the handle during operation. The structure is simple and easy to operate, enabling existing pressure vessel products to quickly achieve manhole protection during sandblasting processes, thus improving production efficiency. Attached Figure Description
[0019] Figure 1 is a schematic diagram of the overall structure of an elliptical manhole sandblasting protection device for pressure vessels according to this utility model.
[0020] Figure 2 is a front view of the manhole of the pressure vessel.
[0021] Figure 3 is a side sectional view of the manhole of the pressure vessel.
[0022] Figure 4 is a first schematic diagram of the manhole location of the pressure vessel.
[0023] Figure 5 is a second schematic diagram of the manhole location of the pressure vessel. Detailed Implementation
[0024] The technical solutions in the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model. In the description of this utility model, it should be noted that the positional relationships indicated by terms such as "upper," "lower," "front," and "rear" are only based on the positional relationships shown in the accompanying drawings and are only for the convenience of describing this utility model, and are not intended to indicate or imply that the referred components have a specific orientation, or are constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.
[0025] Specific Implementation Method 1: This implementation method is described with reference to Figures 1 to 5. This implementation method provides a sandblasting protection device for an elliptical manhole of a pressure vessel, characterized in that it includes a fixing plate 1, a connecting rod 2, an adjusting bolt 3, a rod sleeve 4, a protective plate 5, a spring 6, a limiting block 7, and a handle 8.
[0026] The fixing plate 1 is fixedly installed at the front of the connecting rod 2. The adjusting bolt 3, the rod sleeve 4, the guard plate 5 and the spring 6 are sequentially fitted onto the connecting rod 2 from front to back. The connecting rod 2 is provided with external threads. The adjusting bolt 3 is threadedly connected to the connecting rod 2. The rod sleeve 4 and the guard plate 5 are both slidably fitted onto the connecting rod 2. The guard plate 5 is fixedly connected to the rear end of the rod sleeve 4. One end of the spring 6 is fixedly connected to the guard plate 5, and the other end of the spring 6 is fixedly connected to the limiting block 7. The limiting block 7 is fixedly installed at the rear of the connecting rod 2. A handle 8 is fixedly installed at the rear end of the connecting rod 2.
[0027] The operation method of this embodiment:
[0028] Installation: First, adjust the relative position of the fixing plate and the connecting rod according to the thickness of the manhole seat by adjusting the bolts. The distance between the fixing plate and the protective plate should be 5-10mm larger than the thickness of the manhole seat. Then, adjust the fixing plate to be approximately aligned with the long axis of the manhole seat, insert it into the manhole horizontally, and press it inward. After pressing, rotate the handle 90°, the spring will retract, and the fixing plate will be locked in the short axis direction at the front end of the manhole. Then release the handle, the spring will rebound, and the protective plate will fit tightly against the rear outer surface of the manhole seat.
[0029] Removal: By rotating the handle 90° and squeezing inward, the spring contracts, the fixing plate moves to the long axis direction, then release the handle, the spring rebounds, and the fixing plate is removed along with the entire device.
[0030] Specific Implementation Method Two: This implementation method is described with reference to Figures 1 to 5. The difference between this implementation method and Specific Implementation Method One is that it also includes a locking block. The locking block is installed at the front end of the protective plate 5. The locking block restricts the circumferential displacement of the protective plate 5. The function of the locking block is to fix the position of the protective plate and the manhole seat, preventing movement and achieving circumferential fixation of the protective plate. Other components and connection methods are the same as in Specific Implementation Method One.
[0031] Specific Implementation Method Three: This implementation method is described with reference to Figures 1 to 5. The difference between this implementation method and Specific Implementation Method One is that the protective plate 5 is annular, and multiple locking blocks are evenly arranged along the circumference of the protective plate 5. The function of the locking blocks is to fix the position of the protective plate and the manhole seat, preventing movement and achieving circumferential fixation of the protective plate. The evenly arranged multiple locking blocks along the circumferential direction of the protective plate 5 enhance the fixing effect. Other components and connection methods are the same as in Specific Implementation Method One or Two.
[0032] Specific Implementation Method Four: This implementation method is described with reference to Figures 1 to 5. The difference between this implementation method and Specific Implementation Method One is that the fixing plate 1 is rectangular in shape. Using a rectangular fixing plate makes it easier for the rear side of the fixing plate to fit snugly against the front face of the manhole seat, enhancing the stability of the structure. Other components and connection methods are the same as any one of Specific Implementation Methods One to Three.
[0033] Specific Implementation Method Five: This implementation method is described with reference to Figures 1 to 5. The difference between this implementation method and Specific Implementation Method One is that the cross-sectional shape of the inner hole of the external manhole seat is elliptical. The major axis of the ellipse is A, the minor axis is B, and the length of the rectangular diagonal of the fixing plate 1 is L, where L satisfies the following formula:
[0034] A≥L≥B. With this design, the fixing plate can extend into the ellipse's major axis side of the manhole, and is limited by the minor axis side of the ellipse. It is simple and convenient. Other components and connection methods are the same as any one of specific embodiments one to four.
[0035] Specific Implementation Method Six: This implementation method is described with reference to Figures 1 to 5. The difference between this implementation method and Specific Implementation Method One is that the thickness of the external manhole seat is D, and the length of the connecting rod 2 is P, where P satisfies the following formula:
[0036] (D+70)cm ≥ P ≥ (D+50)cm. Using this length range for the connecting rod ensures a higher degree of compatibility with the manhole seat and makes it more convenient to use. Other components and connection methods are the same as any one of specific embodiments one through five.
[0037] Specific Implementation Method Seven: This implementation method is described with reference to Figures 1 to 5. The difference between this implementation method and Specific Implementation Method One is that the protective plate 5 is welded to the rear end of the sleeve 4, and the weld joint between the protective plate 5 and the sleeve 4 forms a sealed structure. This design enhances the protective effect of the protective plate. Other components and connection methods are the same as in any one of Specific Implementation Methods One to Six.
[0038] Specific Implementation Method Eight: This implementation method is described with reference to Figures 1 to 5. The difference between this implementation method and Specific Implementation Method One is that the fixing plate 1 is fixedly installed on the front part of the connecting rod 2 by welding. Welding is a simple and reliable method. Other components and connection methods are the same as any one of Specific Implementation Methods One to Seven.
[0039] Specific Implementation Method Nine: This implementation method is described with reference to Figures 1 to 5. The difference between this implementation method and Specific Implementation Method One is that the limiting block 7 is fixedly installed on the rear part of the connecting rod 2 by welding. Welding is a simple and reliable method. Other components and connection methods are the same as any one of Specific Implementation Methods One to Eight.
[0040] Specific Implementation Method Ten: This implementation method is described with reference to Figures 1 to 5. The difference between this implementation method and Specific Implementation Method One is that a handle 8 is welded to the rear end of the connecting rod 2. Other components and connection methods are the same as any one of Specific Implementation Methods One to Nine.
[0041] The working principle of this utility model is explained with reference to Figures 1 to 5:
[0042] Depending on the thickness of the manhole seat, adjust the relative position of the fixing plate and the connecting rod using the adjusting bolts. The distance between the fixing plate and the protective plate should be 5-10mm larger than the thickness of the manhole seat. Then, adjust the fixing plate until it approximately coincides with the long axis of the manhole seat, insert it horizontally into the manhole, and press it inwards. After pressing, rotate the handle 90°; the spring will retract, and the fixing plate will lock into place at the short axis of the manhole's front end. Release the handle; the spring will return, tightly fitting the protective plate against the rear outer surface of the manhole seat. Rotate the handle 90° and press inwards; the spring will retract, and the fixing plate will be aligned with the long axis. Release the handle; the spring will return, allowing the fixing plate to be removed along with the entire device. This allows for quick assembly and disassembly.
[0043] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.
Claims
1. A sandblasting protection device for an elliptical manhole of a pressure vessel, characterized in that... It includes a fixed plate (1), a connecting rod (2), an adjusting bolt (3), a rod sleeve (4), a protective plate (5), a spring (6), a limiting block (7), and a handle (8); the fixed plate (1) is fixedly installed on the front of the connecting rod (2), and the adjusting bolt (3), the rod sleeve (4), the protective plate (5), and the spring (6) are sequentially fitted onto the connecting rod (2) from front to back; the connecting rod (2) is provided with external threads, the adjusting bolt (3) is threadedly connected to the connecting rod (2), the rod sleeve (4) and the protective plate (5) are both slidably fitted onto the connecting rod (2), the protective plate (5) is fixedly connected to the rear end of the rod sleeve (4), one end of the spring (6) is fixedly connected to the protective plate (5), the other end of the spring (6) is fixedly connected to the limiting block (7), the limiting block (7) is fixedly installed on the rear of the connecting rod (2), and a handle (8) is fixedly installed on the rear end of the connecting rod (2).
2. The pressure vessel elliptical manhole sandblasting protection device according to claim 1, characterized in that... It also includes a locking block, which is installed at the front end of the guard plate (5) to restrict the circumferential displacement of the guard plate (5).
3. The pressure vessel elliptical manhole sandblasting protection device according to claim 2, characterized in that, The guard plate (5) is ring-shaped, and multiple locking blocks are evenly arranged along the circumference of the guard plate (5).
4. The pressure vessel elliptical manhole sandblasting protection device according to claim 1, characterized in that, The shape of the fixing plate (1) is rectangular.
5. A sandblasting protection device for an elliptical manhole of a pressure vessel according to claim 4, characterized in that, The inner cross-sectional shape of the external manhole seat is elliptical, the major axis of the ellipse is A, the minor axis of the ellipse is B, and the length of the rectangular diagonal of the fixing plate (1) is L, which satisfies the following formula: A≥L≥B.
6. The pressure vessel elliptical manhole sandblasting protection device according to claim 1, characterized in that, The thickness of the external manhole seat is D, and the length of the connecting rod (2) is P. P satisfies the following formula: (D+70)cm≥P≥(D+50)cm.
7. The pressure vessel elliptical manhole sandblasting protection device according to claim 1, characterized in that, The guard plate (5) is welded to the rear end of the sleeve (4), and the weld joint between the guard plate (5) and the sleeve (4) forms a sealed structure.
8. The pressure vessel elliptical manhole sandblasting protection device according to claim 1, characterized in that, The fixing plate (1) is fixedly installed on the front of the connecting rod (2) by welding.
9. A sandblasting protection device for an elliptical manhole of a pressure vessel according to claim 1, characterized in that, The limiting block (7) is fixedly installed at the rear of the connecting rod (2) by welding.
10. A sandblasting protection device for an elliptical manhole of a pressure vessel according to claim 1, characterized in that, A handle (8) is welded to the rear end of the connecting rod (2).