Detachable square tube box pressing device

Abstract

The utility model provides a detachable square tube box pressing device, which adopts an inner and outer double-module mechanical sealing structure and comprises an inner force bearing module, an outer force bearing module, an outer force bearing module, an inner force bearing module, an outer force bearing module, an inner force bearing module and an outer force bearing module, and is characterized in that the inner force bearing module is an adjustable I-shaped steel cross arm provided with a telescopic mechanism used for adapting to square tube boxes with different widths; the dynamic sealing module comprises a sealing plate, a pull rod group and a quick-release flange assembly; the sealing plate and the flange cover are provided with pressure test interfaces which are used for connecting a pressure source and pressure detection equipment. The hydraulic telescopic arm has the advantages that the hydraulic telescopic arm structure of the adjustable I-shaped steel cross arm can quickly adapt to square tube boxes of different width specifications, and the traditional blind plate welding procedure is thoroughly eliminated; through the pull rod group and the quick-release flange assembly of the dynamic sealing module, the test device can be quickly mounted and dismounted.

Description

Technical Field

[0001] This utility model relates to the field of pressure testing devices, specifically to a detachable square tube box pressure testing device. Background Technology

[0002] In the production of evaporative condensers, the tube bundle, as the core heat exchange unit of the entire equipment, directly determines the operational safety and energy efficiency of the whole machine through its airtightness. To ensure no leakage, the traditional production process requires welding heavy blind flanges to the ends of each pipeline to achieve forced sealing. After completing the water pressure or air pressure test, the blind flanges are then forcibly removed using high-temperature gas cutting. This operation mode seems simple and direct, but it hides multiple process pitfalls, significantly restricting production efficiency and product reliability. The complete testing cycle from welding and sealing to cutting and unsealing not only requires two groups of professional technicians to work alternately, but the average testing time for a single tube bundle is more than four hours, causing severe congestion at key workstations on the production line. In addition, the continuous high-temperature impact of the welding torch and cutting torch causes frequent local thermal deformation of the high-precision machined thin-walled tube ends. Statistics show that the proportion of tube ends with excessive deformation is as high as 15%, and a large number of semi-finished products have to be reworked or scrapped due to sealing failure, significantly reducing the final pass rate of the entire batch of products.

[0003] The repetitive high-temperature destructive operations also create a chain reaction of process burdens. Residues such as oxidized slag and weld beads left at the pipe openings after cutting must be removed manually with grinding wheels. This additional step not only increases labor and material costs but also introduces secondary quality risks due to dimensional errors or surface scratches during the grinding process. More importantly, the heat-affected zone of the material at the pipe openings continuously expands due to repeated welding, leading to a sustained deterioration of the metal lattice structure and a significant decline in fatigue strength and corrosion resistance. This phenomenon is particularly pronounced in products that have undergone multiple repairs. This hidden material damage significantly reduces the theoretical service life of the tube bundle, causing the final equipment to experience premature leakage or rupture during its service life, bringing unpredictable maintenance risks to users.

[0004] The aforementioned drawbacks profoundly reflect the systemic damage that traditional testing methods inflict on production processes: efficiency bottlenecks, quality fluctuations, cost redundancy, and shortened lifespan create a vicious cycle. The market urgently anticipates a fundamental transformation in testing concepts, seeking an innovative pressure testing device that can meet high-pressure sealing requirements while completely avoiding damage from thermal operations. This device must possess core characteristics such as non-destructive installation, instant sealing, rapid disassembly, and unlimited reusability, thoroughly replacing the crude testing model that sacrifices pipe integrity, thereby unlocking the potential efficiency of the entire production system. Utility Model Content

[0005] To address the issues of low efficiency, potential quality problems, and high costs associated with existing welding blind flange processes;

[0006] This utility model proposes a detachable square pipe box pressure testing device, which adopts an inner and outer dual-module mechanical seal structure, including:

[0007] Internal load-bearing module: Adjustable I-beam crossbeam, which is equipped with a telescopic mechanism to adapt to square tube boxes of different widths;

[0008] Dynamic sealing module: includes a sealing plate, a tie rod assembly, and a quick-release flange assembly; the sealing plate has a sealing groove machined on the surface facing the pipe box end, and a rubber sealing ring is embedded in the sealing groove; the tie rod assembly consists of multiple tie rods that pass through pre-drilled holes on the square pipe box, with one end connected to the I-beam crossbeam and the other end connected to the sealing plate; the quick-release flange assembly includes a flange fixedly connected to the sealing plate and a detachable flange cover;

[0009] Hydraulic interface system: Pressure test interfaces are provided on the sealing plate and flange cover for connecting pressure source and pressure detection equipment.

[0010] As a preferred embodiment, the telescopic mechanism of the I-beam crossarm is a hydraulic telescopic arm.

[0011] As a preferred embodiment, the tie rod assembly is an M20 chrome-plated tie rod with a self-locking nut at the end and secured with a ratchet wrench.

[0012] As a preferred embodiment, the rubber sealing ring is an oil-resistant fluororubber gasket.

[0013] As a preferred embodiment, the flange cover is equipped with a calibrated rupture disc for overpressure protection.

[0014] As a preferred embodiment, the pressure test interface on the flange cover is a universal pressure gauge interface.

[0015] The beneficial effects of this utility model are as follows:

[0016] This invention utilizes an adjustable I-beam crossarm hydraulic telescopic arm structure to quickly adapt to square pipe boxes of different widths, completely eliminating the traditional blind flange welding process. The dynamic sealing module's tie rod assembly and quick-release flange assembly enable rapid installation and disassembly of the testing device, significantly reducing single-test time from the traditional four hours to less than thirty minutes. It also avoids the reliance on dual-job cooperation for welding and gas cutting operations, requiring only one person to complete the work, significantly reducing manpower and improving production line efficiency.

[0017] The zero-heat operation characteristic directly eliminates the need for grinding off cutting residue, saving labor and material costs for secondary surface treatment and avoiding hidden losses caused by deformation and rework. Safety performance is fundamentally improved; the calibrated rupture disc on the flange cover can achieve millisecond-level response under overpressure conditions, providing reliable overpressure protection; while the universal pressure gauge interface design greatly enhances the flexibility and accuracy of on-site pressure monitoring, further reducing the risk of misjudgment. Attached Figure Description

[0018] To make the content of this utility model easier to understand, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings, wherein...

[0019] Figure 1 This is a schematic diagram of the structure of the present invention.

[0020] The numbers in the attached diagram are:

[0021] 1. I-beam crossbeam; 2. Tie rod assembly; 3. Sealing plate; 4. Rubber sealing ring; 5. Flange; 6. Flange cover. Detailed Implementation

[0022] To illustrate the features of this utility model, the following description, in conjunction with the accompanying drawings and embodiments, will further explain this utility model.

[0023] Example:

[0024] Please see Figure 1 This utility model provides a detachable square pipe box pressure testing device, with an inner and outer dual-module core structure. The inner load-bearing module uses an adjustable I-beam crossbeam 1 as the main support, which is welded from high-strength Q345B steel plate with a cross-sectional dimension of 200×100mm. Its built-in hydraulic telescopic arm includes two sleeve-type movable beams, driven by a single-acting hydraulic cylinder, with a stroke adjustment range of 800–1500mm, which can cover square pipe boxes of different widths. A 15mm thick pressure plate is welded to the end of the telescopic arm, and the surface is treated with high-frequency quenching to ensure compressive strength.

[0025] The dynamic sealing module consists of three main parts:

[0026] Sealing plate assembly: Made of 304 stainless steel by integral milling, with dimensions matching the end face of the pipe box; a sealing groove is set on the sealing surface facing the pipe box, and an oil-resistant fluororubber sealing ring 4 with a cross-sectional diameter of 10mm is press-fitted in the groove, with a Shore hardness of 75±3 to ensure high pressure elasticity;

[0027] Tie rod assembly 2 structure: It consists of 4 chrome-plated tie rods, with the front end hinged to the adjustable I-beam crossarm 1 via a pin, and the rear end fixedly connected to the sealing plate 3;

[0028] Quick-release flange assembly: Flange 6 and sealing plate 3 are fixedly connected by flange 5; flange cover 6 is a 25mm thick 16Mn forged steel part, which can be quickly locked by 8 sets of M16 bolts, and a Ø25mm test through hole is opened in the center of the cover. A Ø15mm through oil passage is drilled in the thickness direction of sealing plate 3, and the port is equipped with a G1 / 2 internal thread pressure interface.

[0029] Hydraulic interface system: The flange cover 6 integrates a universal pressure gauge interface component, which is compatible with a shockproof pressure gauge with an accuracy of 0.5 grade; at the same time, a DN15 calibrated rupture disc is nested and installed, with the burst pressure set to 2.5MPa.

[0030] The above embodiments and accompanying drawings are only used to illustrate the technical solutions of this utility model and are not intended to limit this utility model. This utility model has been described in detail with reference to preferred embodiments. Those skilled in the art should understand that any changes, modifications, additions, or substitutions made by those skilled in the art within the scope of this utility model do not depart from the spirit of this utility model and should also fall within the protection scope of the claims of this utility model. Other related technical structures not disclosed in detail in this utility model are existing technologies in the art.

Claims

1. A detachable square tube box pressing device, characterized in that, It adopts an internal and external dual-module mechanical seal structure, including: Internal load-bearing module: Adjustable I-beam crossbeam (1), equipped with a telescopic mechanism to adapt to square tube boxes of different widths; Dynamic sealing module: includes sealing plate (3), tie rod assembly (2), and quick-release flange assembly; the sealing plate (3) has a sealing groove on the surface facing the end face of the pipe box, and a rubber sealing ring (4) is embedded in the sealing groove; the tie rod assembly (2) is composed of multiple tie rods that pass through the reserved holes on the square pipe box, one end of which is connected to the adjustable I-beam crossbeam (1), and the other end is connected to the sealing plate (3); the quick-release flange assembly includes a flange (5) fixedly connected to the sealing plate (3) and a detachable flange cover (6). Hydraulic interface system: Pressure test interfaces are provided on the sealing plate (3) and flange cover (6) for connecting pressure source and pressure detection equipment.

2. The detachable square tube box pressing device according to claim 1, characterized in that: The telescopic mechanism of the I-beam crossarm (1) is a hydraulic telescopic arm.

3. The detachable square tube box pressing device according to claim 1 or 2, characterized in that: The tie rod assembly (2) is an M20 chrome-plated tie rod with a self-locking nut at the end, which is tightened using a ratchet wrench.

4. The detachable square tube box pressing device according to claim 1, characterized in that: The rubber sealing ring (4) is an oil-resistant fluororubber sealing gasket.

5. The detachable square tube box pressing device according to claim 1, characterized in that: The flange cover (6) is equipped with a calibrated rupture disc for overpressure protection.

6. The detachable square tube box pressing device according to claim 1, characterized in that: The pressure test interface on the flange cover (6) is a universal pressure gauge interface.

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