Flange fixing clamp for square pipeline and ventilation test system

Abstract

The utility model provides a flange fixing clamp for a square pipeline and a ventilation test system, and the clamp comprises two clamping plates, any clamping plate comprises a clamping part, the clamping part is provided with at least two adjusting through grooves, and the two adjusting through grooves respectively extend towards two adjacent side walls of the square pipeline; any adjusting assembly comprises a limiting rod and an adjusting sliding block, the limiting rod is arranged in the adjusting through groove in a penetrating mode, one end of the adjusting sliding block is connected to the limiting rod, the other end of the adjusting sliding block abuts against the square pipeline to be clamped, and the limiting rod moves in the adjusting sliding groove. Flanges of two square pipelines are extruded and clamped through the two clamping plates so as to achieve connection between the two square pipelines, the adjusting assembly can adjust the clamping depth of the clamping plates, and therefore the clamp can be suitable for the square pipelines of different sizes. Based on the design, the clamping device has the advantages of being flexible to use, wide in application range, convenient to operate, high in clamping stability and the like.

Description

Technical Field

[0001] This utility model relates to the field of clamping technology, specifically to a flange fixing clamp and ventilation testing system for square pipes. Background Technology

[0002] In today's industrial production and technological research and development context, the performance of air filtration equipment plays a crucial role in the production environment and product quality of many fields. To ensure that air filtration equipment has excellent filtration performance, various tests on the filtration performance of filter elements and media are essential in its research and development and production stages. This usually requires testing the filter components in ventilation ducts.

[0003] Currently, various ventilation testing platforms exist on the market, such as the ventilation filter testing platform disclosed in CN102072868A. This testing platform encompasses a primary filter, an airflow section, a sealed mixing chamber, a filter testing device, and a final filter device. The filter testing device includes an upstream testing section and a downstream testing section, each equipped with its own sampling tube. The device is equipped with a pair of parallel clamping square pipes, a second micromanometer, and a test filter bracket below, connected to the final filter device via the downstream testing end. However, during testing, the filter under test is placed on the bracket, and in this process, existing ventilation testing platforms present numerous structural connection problems that urgently need to be addressed.

[0004] A typical testing platform generally consists of a fan section and multi-stage square ventilation ducts. There are two main methods for connecting the various levels of square ventilation ducts and the components under test. One method involves drilling holes in the flanges at both ends of the square ducts and then connecting them with bolts. However, due to differences in rated airflow among different filter components, variations in the dimensions of different square ducts, and tolerances at both ends of different batches or types of square ventilation ducts, reducers, and filter components, it becomes difficult to align the bolt holes in actual operation. This causes significant installation difficulties. Furthermore, bolted connections require tools for both assembly and disassembly, making the process cumbersome and inefficient, greatly impacting the entire testing process.

[0005] Secondly, the industry also uses ordinary clamps (such as bolt cutters) for temporary fixation. Existing bolt cutters mostly employ a dead-point self-locking mechanism, requiring operators to expend considerable force during clamping or releasing. More importantly, when the test platform is running, the vibration generated by the fan section severely affects clamping stability, making ordinary bolt cutters prone to deflection or even loosening, leading to test interruptions or inaccurate data. Furthermore, due to the misalignment of flanges at both ends of square pipes of different sizes, clamps need to be frequently changed according to dimensional variations during installation, which undoubtedly further reduces assembly efficiency and consequently has a serious negative impact on testing efficiency.

[0006] In summary, the shortcomings of existing ventilation test platforms in terms of connection methods severely restrict the efficient conduct of air filtration equipment testing. There is an urgent need for an innovative connection structure or method to improve the assembly efficiency and connection stability of ventilation test platforms, thereby meeting the demand for efficient and accurate testing in the research and development and production of air filtration equipment. Summary of the Invention

[0007] Therefore, the technical problem to be solved by this utility model is to overcome the problems of complex connection of square pipes and unstable connection of square pipes of different sizes in the prior art, and to provide a flange fixing clamp and ventilation testing system for square pipes.

[0008] To solve the above-mentioned technical problems, this utility model provides a flange fixing clamp for square pipes, comprising: two clamping plates, each clamping plate including a clamping part, an end plate part, and a rotating connecting part. The end plate part is disposed in the middle of the clamping part and extends in a direction away from the square pipe to be clamped. The rotating connecting part is disposed between the end plate part and the clamping part, and drives the end plate part and the clamping part to rotate in opposite directions around the rotation center line through a connecting shaft. The two clamping parts are relatively close to / away from each other to clamp the square pipe flange. The clamping parts are provided with... At least two adjusting slots are provided at both ends of the clamping part and extend toward the two adjacent side walls of the square pipe respectively; at least two adjusting components are connected to the two adjusting slots respectively. Each adjusting component includes a limiting rod and an adjusting slider. The limiting rod passes through the adjusting slot. One end of the adjusting slider is connected to the limiting rod, and the other end abuts against the square pipe to be clamped. The limiting rod moves in the adjusting slot to drive the adjusting slider to squeeze / release the square pipe to be adjusted.

[0009] In one embodiment of the present invention, the clamping part is provided with a clamping groove, and the flange corner of the square pipe to be clamped is embedded in the clamping groove, and the inside of the clamping groove is provided with an anti-slip pad.

[0010] In one embodiment of this utility model, both ends of the clamping part are provided with adjusting grooves, and the adjusting through groove is disposed in the adjusting groove; the adjusting slider includes a connecting part and a squeezing part that are perpendicular to each other, the connecting part is connected to the limiting rod and is slidably embedded in the adjusting groove, the squeezing part is disposed towards the square pipe to be clamped, wherein the depth of the adjusting groove is not less than the thickness of the connecting part.

[0011] In one embodiment of this utility model, the adjusting groove is provided with a limiting concave tooth, and the connecting part is provided with a limiting convex tooth on one side. The limiting convex tooth and the limiting concave tooth can mesh with each other, and the other side is provided with an anti-slip tooth, which is positioned towards the square pipe flange to be clamped.

[0012] In one embodiment of the present invention, the adjusting component includes an elastic element, which is sleeved on the limiting rod, with its two ends respectively abutting against the end of the limiting rod and the outer wall of the clamping plate.

[0013] In one embodiment of this utility model, the clamping groove is provided with an anti-slip pad.

[0014] In one embodiment of the present invention, the flange fixing clamp for square pipes further includes a fastening assembly, which includes a screw, an adjusting handle, and an abutment. The screw passes through the end plate portion of one of the clamping plates, with one end connected to the abutment and the other end connected to the adjusting handle. The abutment can abut against the inner wall of the end plate portion of another clamping plate.

[0015] In one embodiment of the present invention, a pad is provided on the end plate portion of one clamping plate, and a fastening screw hole is provided on the end plate portion of the other clamping plate. The screw passes through the fastening screw hole and is threadedly engaged with the fastening screw hole. The adjusting handle drives the screw to rotate around its axial direction so that the abutting member moves toward / away from the pad.

[0016] In one embodiment of this utility model, the abutment is configured as a spherical structure, the pad has a spherical groove at its center, and the abutment can be embedded in the spherical groove.

[0017] This utility model also provides a ventilation testing system, which includes the above-mentioned flange fixing clamp for square pipes.

[0018] The above-mentioned technical solution of this utility model has the following advantages compared with the prior art:

[0019] The flange fixing clamp and ventilation testing system for square pipes described in this utility model uses two clamping plates to compress and clamp the flanges of two square pipes to achieve a connection between the two square pipes. Simultaneously, an adjustment component allows for adjustment of the clamping depth of the clamping plates, thus making the clamp applicable to square pipes of different sizes. Compared with current conventional pipe reinforcement technologies, this application has advantages such as flexibility, wide applicability, ease of operation, and high clamping stability, and has broad application prospects in the industry. Attached Figure Description

[0020] 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.

[0021] Figure 1 This is a three-dimensional structural diagram of the flange fixing clamp for square pipes in a preferred embodiment of this utility model;

[0022] Figure 2 yes Figure 1 The diagram shows a three-dimensional structure of a clamping plate and an adjusting component in a flange fixing clamp for a square pipe.

[0023] Figure 3 It is multiple Figure 1 The diagram shows a three-dimensional structure of a flange fixing clamp for a square pipe and the square pipe to be clamped.

[0024] Explanation of reference numerals in the accompanying drawings: 100, clamping plate; 110, clamping part; 111, adjusting through groove; 112, clamping groove; 113, adjusting slide groove; 114, limiting tooth; 120, end plate part; 121, pad block; 130, rotating connection part; 140, anti-slip pad; 200, adjusting assembly; 210, adjusting slider; 211, connecting part; 212, pressing part; 213, limiting tooth; 214, anti-slip tooth; 220, limiting rod; 230, elastic element; 300, fastening assembly; 310, screw; 320, adjusting handle; 330, abutment part; 400, square pipe; 410, flange; 1001, rotation center line. Detailed Implementation

[0025] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand and implement the present invention. However, the embodiments described are not intended to limit the present invention. Example 1

[0026] This embodiment provides a flange fixing clamp for square pipes, which can clamp and fix the square pipes by clamping the flanges of two adjacent square pipes.

[0027] It should be noted that, in this industry, the end of the square pipe 400 is provided with a flange 410, which extends vertically outward from the cross-sectional edge of the square pipe 400. The flanges 410 of two square pipes 400 to be clamped fit together. The flange fixing clamp for square pipes described in this application achieves the connection of the square pipes 400 by clamping the flanges 410 of the two square pipes 400.

[0028] See Figure 1As shown, the flange fixing clamp for a square pipe described in this embodiment includes two clamping plates 100 and at least two adjusting components 200. Each clamping plate 100 includes a clamping portion 110, with the two clamping portions 110 positioned close to / away from each other to clamp the square pipe flange 410. Each clamping portion 110 has at least two adjusting slots 111, which are respectively located at both ends of the clamping portion 110 and extend towards two adjacent sidewalls of the square pipe 400. At least two adjusting components 200 are correspondingly connected to the two adjusting slots 111. Each adjusting component 200 includes a limiting rod 220 and an adjusting slider 210. The limiting rod 220 passes through the adjusting slot 111, and one end of the adjusting slider 210 is connected to the limiting rod 220, while the other end abuts against the square pipe 400 to be clamped. The limiting rod 220 moves within the adjusting slot 111 to cause the adjusting slider 210 to press / release the square pipe 400 to be adjusted.

[0029] The clamping plate 100 is used to press and clamp the square pipe flange 410 from the thickness direction, and the adjusting component 200 is used to abut and press the square pipe body 400 in the protrusion depth direction of the square pipe flange 410. This can indirectly increase the clamping depth of the clamping plate 100, so that the fixture can be applied to square pipes 400 of different sizes.

[0030] See Figure 1 and Figure 2 As shown, the clamping plate 100 in this embodiment includes a clamping portion 110, an end plate portion 120, and a rotating connecting portion 130. The end plate portion 120 is disposed in the middle of the clamping portion 110 and extends in a direction away from the square pipe 400 to be clamped. The rotating connecting portion 130 is disposed between the end plate portion 120 and the clamping portion 110, and drives the end plate portion 120 and the clamping portion 110 to rotate in opposite directions around the rotation center line 1001 via a connecting shaft. Further, in this embodiment, the clamping portion 110 is used to directly contact the flange 410 of the square pipe 400, the end plate portion 120 is used to connect a driving device to realize the relative approach / away movement of the two clamping portions 110, and the rotating portion 130 realizes the rotational connection of the two clamping plates 100 via a connecting shaft, thereby forming a lever structure at both ends of the clamping plate 100. Specifically, in this embodiment, the two clamping plates 100 are able to rotate around the rotation center line 1001, which coincides with the axis of the connecting shaft.

[0031] In this embodiment, the clamping part 110 is provided with a clamping groove 112, and the corner of the square pipe flange 410 to be clamped is embedded in the clamping groove 112. Further, in this embodiment, the clamping groove 112 is preferably an "L"-shaped structure matching the shape of the corner of the square pipe flange 410, and correspondingly, the clamping part 110 in this embodiment is also configured as an "L"-shaped structure. This specific right-angle shape can precisely achieve a tight fit with the corner of the flange 410, greatly improving the stability of the clamping. At the same time, an anti-slip pad 140 is provided inside the clamping groove 112, which can effectively increase the friction between the clamping groove 112 and the flange 410. Even in environments with strong vibration, the risk of deflection and loosening can be greatly reduced, ensuring that the connection remains stable under complex working conditions, and providing a guarantee for the stable operation of the equipment.

[0032] Furthermore, in this embodiment, both ends of the clamping part 110 are provided with adjusting grooves 113, which extend perpendicularly to the sidewall of the corresponding square pipe to facilitate the movement of the adjusting component 200 within them. Even further, an adjusting through groove 111 is provided in the adjusting groove 113 for sliding connection of the adjusting component 200. Specifically, the adjusting component 200 in this embodiment includes an elastic element 230, which is sleeved on the limiting rod 220, with its two ends abutting against the end of the limiting rod 220 and the outer wall of the clamping plate 100, respectively. Under normal conditions, the elastic element 230 is always in a compressed state, thus spontaneously fixing the specific position of the adjusting slider 210.

[0033] See Figure 2 As shown, the adjusting slider 210 includes a connecting portion 211 and a pressing portion 212 that are perpendicular to each other. The connecting portion 211 is connected to the limiting rod 220 and is slidably embedded in the adjusting groove 111, while the pressing portion 212 is positioned towards the square pipe 400 to be clamped. Based on the above structural configuration, in this embodiment, the connecting portion 211 is used to connect with the limiting rod 220 so that the pressing portion 212 can abut against the outer wall of the square pipe 400. The depth of the adjusting groove 113 is not less than the thickness of the connecting portion 211 to ensure that the pressing portion 212 can make tight contact with the square pipe flange 410.

[0034] Furthermore, in this embodiment, the adjusting slide 113 is provided with a limiting concave tooth 114, and the connecting part 211 is provided with a limiting convex tooth 213 on one side. The limiting convex tooth 213 and the limiting concave tooth 114 can mesh with each other, and the other side is provided with an anti-slip tooth 214, which is positioned towards the square pipe flange 410 to be clamped. The limiting convex tooth 213 and the limiting concave tooth 114 can mesh tightly under the action of the elastic element 230, thereby achieving the positioning of the adjusting slider 210. The anti-slip tooth 214 can contact the surface of the square pipe flange 410 in the clamping state, thereby increasing the friction and further improving the clamping stability.

[0035] In this embodiment, the flange fixing clamp for square pipes further includes a fastening assembly 300, which includes a screw 310, an adjusting handle 320, and an abutment 330. The screw 310 passes through the end plate portion 120 of one clamping plate 100, with one end connected to the abutment 330 and the other end connected to the adjusting handle 320. The abutment 330 can abut against the inner wall of the end plate portion 120 of another clamping plate 100. One clamping plate 100 has a pad 121 on its end plate portion 120, and the other clamping plate 100 has a fastening screw hole. The screw 310 passes through the fastening screw hole and is threaded into it. The adjusting handle 320 drives the screw 310 to rotate around its axial direction, causing the abutment 330 to move toward / away from the pad 121.

[0036] Specifically, in this embodiment, the abutment 330 is configured as a spherical structure, and the pad 121 has a spherical groove at its center, into which the abutment 330 can be embedded. The pad 121 serves two purposes: firstly, it provides protection for the end plate 120 and improves the contact stability between it and the abutment 330; secondly, the mating structure between it and the abutment 330 prevents squeezing and displacement of the screw 310 during tightening, thereby improving the stability and service life of the fixture.

[0037] The following describes the usage process and principle of the flange fixing clamp for square pipes in this embodiment:

[0038] See Figure 3 As shown, before use, the end flanges 410 of adjacent square ventilation ducts 400 need to be aligned. Then, multiple clamps are placed at the four corners of the flanges 410, so that the corners of the flanges 410 are embedded in the clamping grooves 112. Then, the fastening assembly 300 is adjusted so that the abutment 330 and the pad 121 are pressed into contact with each other, and the screw 310 is further tightened. At this time, the corners of the flanges 410 are pressed and fixed between the two clamping parts 110.

[0039] When misalignment occurs between the flanges 410 on both sides due to size differences, the clamping point of the clamping plate 100 on one side may not be able to cover the flange plate. In this case, the clamping depth of the flange 410 needs to be adjusted using the adjusting assembly 200: First, the limiting rod 220 is squeezed, further compressing the elastic element 230 until the limiting protrusion 213 of the adjusting slider 210 disengages from the limiting concave tooth 114 in the adjusting groove 113. Then, the adjusting slider 210 is driven to extend out of the clamping plate 100, and its extension length is adjusted according to actual usage requirements. Afterward, the limiting rod 220 is released, and the adjusting slider 210 automatically locks in position under the force of the elastic element 230, thus completing the process of adjusting the clamping depth.

[0040] When it is necessary to disassemble this fixture, simply turn the adjusting handle 320 in the opposite direction to loosen the screw 310. Example 2

[0041] This embodiment provides a ventilation testing system, which includes the flange fixing clamp for square pipes as described in Embodiment 1.

[0042] In summary, the flange fixing clamp and ventilation testing system for square pipes described in this utility model uses two clamping plates 100 to press and clamp the flanges 410 of two square pipes 400, thereby achieving a connection between the two square pipes 400. Simultaneously, the adjusting component 200 can adjust the clamping depth of the clamping plates 100, thus making this clamp applicable to square pipes 400 of different sizes. Compared with current conventional pipe reinforcement technologies, this application has advantages such as flexibility, wide applicability, ease of operation, and high clamping stability, and has broad application prospects in the industry.

[0043] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the protection scope of this invention.

Claims

1. A flange fixing clamp for square pipes, characterized in that: The utility model provides a square pipe flange fixing clamp, which comprises two clamping plates, at least two adjusting assemblies and a fastening assembly. The clamping plates each comprise a clamping part, an end plate part and a rotating connecting part. The end plate part is arranged at the middle part of the clamping part and extends away from the square pipe to be clamped.

2. The flange fixture for square tubing according to claim 1, wherein: The rotating connecting part is arranged between the end plate part and the clamping part and drives the end plate part and the clamping part to rotate reversely around the rotating center line through the connecting shaft.

3. The flange fixture for square tubing according to claim 1, wherein: The clamping parts are relatively close to or away from each other to clamp the square pipe flange.

4. The flange fixture for square tubing according to claim 3, wherein: At least two adjusting grooves are arranged on the clamping part.

5. The flange fixture for square tubing according to claim 1, wherein: The adjusting grooves are arranged at the two ends of the clamping part and extend towards the adjacent two side walls of the square pipe.

6. The flange fixture for square tubing according to claim 1, wherein: The adjusting assemblies are correspondingly connected to the adjusting grooves.

7. The flange fixture for square tubing according to claim 6, wherein: The adjusting assembly comprises a limiting rod and an adjusting sliding block.

8. The flange fixture for square tubing according to claim 7, wherein: The limiting rod is arranged in the adjusting groove.

9. The flange fixture for square tubing according to claim 2, wherein: The one end of the adjusting sliding block is connected to the limiting rod, and the other end is arranged to abut against the square pipe to be clamped.

10. A ventilation testing system characterized by: The limiting rod moves in the adjusting groove to drive the adjusting sliding block to press or release the square pipe to be adjusted. The clamping part is provided with a clamping groove. The flange corner of the square pipe to be clamped is embedded in the clamping groove. The two ends of the clamping part are provided with adjusting sliding grooves. The adjusting groove is arranged in the adjusting sliding groove. The adjusting sliding block comprises a connecting part and a pressing part which are perpendicular to each other. The connecting part is connected to the limiting rod and is slidingly embedded in the adjusting sliding groove. The pressing part is arranged towards the square pipe to be clamped. The depth of the adjusting sliding groove is not less than the thickness of the connecting part. The adjusting sliding groove is internally provided with a limiting recessed tooth. The connecting part is provided with a limiting convex tooth on one side. The limiting convex tooth and the limiting recessed tooth can be engaged with each other. The other side is provided with an anti-skid tooth which is arranged towards the flange of the square pipe to be clamped. The adjusting assembly comprises an elastic member. The elastic member is sleeved on the limiting rod and abuts against the end part of the limiting rod and the outer wall of the clamping plate. The square pipe flange fixing clamp further comprises a fastening assembly. The fastening assembly comprises a screw rod, an adjusting handle and an abutting member. The screw rod is arranged in the end plate part of one clamping plate. The one end of the screw rod is connected to the abutting member, and the other end is connected to the adjusting handle. The abutting member can abut against the inner wall of the end plate part of the other clamping plate. The end plate part on one clamping plate is provided with a pad. The end plate part on the other clamping plate is provided with a fastening screw hole. The screw rod is arranged in the fastening screw hole and is threadedly engaged with the fastening screw hole. The adjusting handle drives the screw rod to rotate around the axial direction to move the abutting member towards or away from the pad. The abutting member is configured as a spherical structure. The pad is centrally provided with a spherical groove. The abutting member can be embedded in the spherical groove. The clamping groove is internally provided with an anti-skid pad. The utility model provides a square pipe flange fixing clamp.

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