A special connecting joint for polyurethane high-pressure flat hose pull-off force test

Abstract

The utility model belongs to material mechanics performance test and detection technical field provides a kind of polyurethane high-pressure flat hose breaking force test special connecting joint, it includes: fixed head, including upper clamping plate and lower clamping plate, the two sides of upper clamping plate and lower clamping plate are concave, be equipped with several recesses in concave place, the two sides of upper clamping plate and lower clamping plate are equipped with connecting hole, and the connecting hole position of upper clamping plate and lower clamping plate corresponds. Mold core, between upper clamping plate and lower clamping plate, be equipped with several protrusions on mold core, several protrusions and recess one-to-one correspondence, the surface of mold core and concave place are pasted. The utility model can be through protrusion and recess and limit polyurethane high-pressure flat hose, increase the friction of polyurethane high-pressure flat hose and upper and lower clamping plate, avoid polyurethane high-pressure flat hose to fall off.

Description

Technical Field

[0001] This utility model belongs to the field of material mechanical property testing and detection technology, and provides a special connection joint for testing the tensile strength of polyurethane high-pressure flat hose. Background Technology

[0002] The reinforcing layer of polyurethane high-pressure flat hoses is made using a high-strength industrial polyester filament twill weave process. It is widely used in shore-to-ship oil transport, offshore floating oil pipelines, and fertilizer towing hoses for large agricultural machinery. It has a high axial tensile strength, typically 100KN to 200KN (10 to 20 tons). Since this hose is made of polymer materials, the axial tensile strength test must not show any damage or mechanical shear in the polyurethane adhesive layer or intermediate layer. Therefore, the axial tensile strength of the polyurethane high-pressure flat hose needs to be tested.

[0003] Existing test connectors use two clamping blocks to hold one end of a polyurethane high-pressure flat hose to measure the breaking force. However, because the polyurethane high-pressure flat hose is relatively smooth, it is easy for it to slip off the clamping blocks and fall out. Utility Model Content

[0004] To solve the above-mentioned technical problems, this utility model provides a special connection joint for testing the tensile strength of polyurethane high-pressure flat hose. It can limit the polyurethane high-pressure flat hose through protrusions and grooves, increase the friction between the polyurethane high-pressure flat hose and the upper and lower clamps, and prevent the polyurethane high-pressure flat hose from falling off.

[0005] The technical solution of this utility model includes: The fixing head includes an upper clamping plate, a lower clamping plate, and a first bolt. The upper and lower clamping plates are recessed on opposite sides, and several grooves are provided in the recessed areas. Both sides of the upper and lower clamping plates are provided with connecting holes, and the positions of the connecting holes of the upper and lower clamping plates are corresponding. The first bolt fixes the upper and lower clamping plates through the connecting holes.

[0006] The mold core is located between the upper and lower clamping plates. The mold core has several protrusions, and the positions of the protrusions and grooves correspond one-to-one. The surface of the mold core matches the concave parts of the upper and lower clamping plates.

[0007] Furthermore, the mold core is flat and round.

[0008] Furthermore, the depth of the groove is between 1.2mm and 1.5mm.

[0009] Furthermore, the groove is semi-circular or frustum-shaped.

[0010] Furthermore, several protrusions are set at equal intervals.

[0011] Furthermore, both the upper and lower clamping plates are provided with several threaded holes, and a second bolt is connected inside the threaded holes.

[0012] Furthermore, several threaded holes are set at equal intervals.

[0013] The technical solution provided by this utility model has the following advantages compared with the prior art: In use, the polyurethane high-pressure flat hose is fitted onto the mold core with an interference fit. Then, the upper and lower clamping plates are placed on the polyurethane high-pressure flat hose, ensuring that the protrusions and grooves correspond one-to-one, thus pressing the polyurethane high-pressure flat hose into the grooves. Finally, the first bolt is inserted into the connecting hole to fix the upper and lower clamping plates, thereby preventing the polyurethane high-pressure flat hose from pulling off during measurement. Compared with the prior art, this utility model can limit the polyurethane high-pressure flat hose through protrusions and grooves, increasing the friction between the polyurethane high-pressure flat hose and the upper and lower clamping plates, and preventing the polyurethane high-pressure flat hose from falling off.

[0014] Other advantages, objectives and features of this invention will be partly apparent from the following description, and partly understood by those skilled in the art through study and practice of this invention. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a front view of the connector according to one embodiment of the present invention; Figure 2 for Figure 1 Sectional view of section AA; Figure 3 for Figure 1 Sectional view of the middle BB section; Figure 4 for Figure 3 Enlarged view of section C.

[0017] Figure label: 1. Upper clamping plate; 2. Lower clamping plate; 3. Mold core; 4. Groove; 5. Protrusion; 6. Threaded hole; 7. Connecting hole; 8. First bolt; 9. Second bolt. Detailed Implementation

[0018] The following describes a specific embodiment of the present invention in detail with reference to the accompanying drawings. However, it should be understood that the scope of protection of the present invention is not limited to the specific embodiment.

[0019] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the technical solution of this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0020] In the description of the embodiments of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0021] like Figures 1 to 4 As shown, this utility model provides a special connection connector for testing the tensile strength of polyurethane high-pressure flat hoses, comprising: The fixing head includes an upper clamping plate, a lower clamping plate, and a first bolt. The upper and lower clamping plates are recessed on opposite sides, and several grooves are provided in the recessed areas. Both sides of the upper and lower clamping plates are provided with connecting holes, and the positions of the connecting holes of the upper and lower clamping plates are corresponding. The first bolt fixes the upper and lower clamping plates through the connecting holes.

[0022] The mold core is located between the upper and lower clamping plates. The mold core has several protrusions, and the positions of the protrusions and grooves correspond one-to-one. The surface of the mold core matches the concave parts of the upper and lower clamping plates.

[0023] In use, the polyurethane high-pressure flat hose is fitted onto the mold core with an interference fit. Then, the upper and lower clamping plates are placed on the polyurethane high-pressure flat hose, ensuring that the protrusions and grooves correspond one-to-one, thus pressing the polyurethane high-pressure flat hose into the grooves. Finally, the first bolt is inserted into the connecting hole to fix the upper and lower clamping plates, thereby preventing the polyurethane high-pressure flat hose from pulling off during measurement. Compared with the prior art, this utility model can limit the polyurethane high-pressure flat hose through protrusions and grooves, increasing the friction between the polyurethane high-pressure flat hose and the upper and lower clamping plates, and preventing the polyurethane high-pressure flat hose from falling off.

[0024] Specifically, in the axial tensile strength test of polyurethane high-pressure flat hoses, existing clamping methods are prone to detachment due to the smooth surface of the hose, severely affecting the accuracy and reliability of the test. The upper and lower clamps are recessed on opposite sides with several grooves. When the hose is placed between them, the recessed structure fits tightly against the hose's shape, providing initial restraint. The grooves significantly increase the friction between the clamps and the hose surface, making it less prone to relative slippage under stress. Corresponding connecting holes on both sides, combined with the first bolt, firmly fix the upper and lower clamps together, forming a stable clamp for the hose. This fixing method not only ensures that the hose will not easily detach during the test but also ensures uniform stress on the hose, avoiding inaccurate test results due to excessive local stress. Through this structural design, testers can obtain more accurate axial tensile strength data for the hose, providing a reliable basis for product quality assessment, improving the efficiency and accuracy of the testing work, and reducing the time and cost losses caused by repeated operations due to test failures.

[0025] Specifically, the mold core is located between the upper and lower clamping plates, with several protrusions on it corresponding one-to-one with the grooves in the clamping plates. When the fixing head clamps the hose, the protrusions of the mold core can embed into the surface of the hose, further increasing the contact area and friction, acting like countless tiny "grippers" to firmly hold the hose and prevent it from slipping during testing. Furthermore, the surface of the mold core matches the recesses of the upper and lower clamping plates, making the entire clamping structure more compact and the force more evenly distributed. During testing, the tensile force on the hose can be evenly transmitted to the clamping plates through the mold core, avoiding localized stress concentration that could cause unnecessary damage to the hose, thus ensuring that the test results accurately reflect the axial tensile strength of the hose. In addition, the presence of the mold core also provides support and protection for the hose to a certain extent, preventing excessive deformation or damage under high tensile force, extending the service life of the hose during testing, and improving the validity and repeatability of the test data.

[0026] In the embodiments provided by this utility model, the mold core is a flat circle. Under the condition that the inner circumference is constant and the mechanical deformation is not caused by fastening, compared with the cylindrical mold core, the flat model effectively ensures and increases the direct contact area between the inner surface of the hose and the outer surface of the mold core. At the same time, compared with the cylindrical mold core, the flat model is easier to bolt to the upper and lower clamping plates with strong fastening, solving the problem that the circular mold core is not easy to fasten radially.

[0027] Specifically, the flat, oval mold core better fits the flat shape of the hose, ensuring a tighter and more comprehensive contact during clamping. Compared to other shapes, it provides a larger contact area, thereby enhancing friction and effectively preventing the hose from slipping or shifting during testing. Simultaneously, the flat, oval structure distributes tensile force evenly across the hose under stress, preventing deformation or damage caused by uneven localized stress. This ensures the hose's integrity during testing, resulting in more accurate test results reflecting the hose's true performance. Furthermore, the flat, oval mold core is easier to manufacture and install. Its regular shape and relatively lower processing difficulty reduce production costs and improve efficiency. In actual testing, the installation and removal of the flat, oval mold core are also more convenient, effectively shortening test preparation time and improving overall testing efficiency. This provides a convenient and reliable guarantee for axial tensile strength testing of polyurethane high-pressure flat hoses.

[0028] In the embodiments provided by this utility model, the depth of the groove is between 1.2 mm and 1.5 mm.

[0029] Specifically, the groove depth is set between 1.2mm and 1.5mm, a reasonable range determined through extensive experimentation and practical verification. If the groove is too shallow, the friction between it and the hose surface is insufficient, making it difficult to effectively restrict hose slippage. The hose still risks detachment during testing, compromising the accuracy and stability of the test. If the groove is too deep, it may cause excessive compression and damage to the hose surface, even destroying the hose's structural integrity before the test begins, rendering the test results unreliable. A depth of 1.2mm to 1.5mm provides sufficient friction when the clamps hold the hose, ensuring a secure hold without causing irreparable damage to the hose surface, thus maintaining good performance during testing. Furthermore, this depth range allows for better engagement between the mold core's protrusions and the groove, further enhancing the clamping effect. This ensures uniform force distribution on the hose while improving the reliability and consistency of test data, providing stable and effective technical support for accurate testing of the axial tensile strength of polyurethane high-pressure flat hoses.

[0030] In the embodiments provided by this utility model, the groove is semi-circular or frustum-shaped.

[0031] Specifically, designing the groove as semi-circular or frustum-shaped offers unique advantages in improving the clamping effect and testing accuracy of polyurethane high-pressure flat hoses. The arc-shaped surface of the semi-circular groove allows for a tighter fit with the hose surface, creating a continuous and uniform frictional force distribution on the contact surface. This effectively prevents the hose from shifting or slipping during testing due to uneven force. When this groove shape mates with the protrusions of the mold core, it better adapts to the elastic deformation of the hose, ensuring clamping force while reducing localized stress concentration on the hose surface and protecting the structural integrity of the hose. The frustum-shaped groove, on the other hand, provides a guiding function, guiding the hose accurately into the groove position when clamped by the clamping plate, facilitating installation and fixation. Its tapered design gradually increases the pressure on the hose during clamping, further enhancing the clamping force and also dispersing tension to some extent, preventing excessive localized stress on the hose.

[0032] Whether it is a semi-circular or frustum-shaped groove, its unique shape and structure can improve the clamping stability of the fixing head on the hose, ensure that the hose is subjected to uniform force during the test, and thus obtain more accurate and reliable axial tensile force test data.

[0033] It should be noted that, depending on the shape of the groove, the corresponding protrusion also has a corresponding structure. To avoid damage to the hose caused by the sharp edges or corners of the protrusions, these sharp edges or corners are smoothed out.

[0034] In the embodiments provided by this utility model, several protrusions are arranged at equal intervals.

[0035] Specifically, the evenly spaced protrusions ensure uniform pressure on the hose during clamping, preventing excessive or insufficient localized stress caused by uneven protrusion distribution. This maintains a good stress state for the hose during testing, preventing damage or deformation due to localized stress concentration and ensuring the test results accurately reflect the hose's axial tensile strength. Simultaneously, the evenly spaced protrusions, when combined with corresponding grooves on the clamping plate, form a stable and balanced clamping structure, enhancing the hose's fixation and effectively preventing slippage or displacement during testing. Furthermore, this evenly spaced arrangement facilitates manufacturing and installation. Standardized processing techniques during mold core production ensure accurate protrusion spacing, improving production efficiency and product quality stability. In practical use, the evenly spaced protrusion structure also facilitates installation and disassembly by testing personnel, reducing the possibility of testing errors due to improper installation and providing a reliable guarantee for accurate testing of the axial tensile strength of polyurethane high-pressure flat hoses.

[0036] In the embodiments provided by this utility model, both the upper clamping plate and the lower clamping plate are provided with a number of threaded holes, and a second bolt is connected in the threaded holes.

[0037] Specifically, the upper and lower clamping plates are equipped with several threaded holes and connected to a second bolt, further enhancing the clamping effect and stability of the fixing head on the polyurethane high-pressure flat hose. The presence of the second bolt allows the clamping force of the clamping plates on the hose to be flexibly adjusted according to actual needs. When testing hoses of different specifications or materials, tightening or loosening the second bolt allows for precise control of the pressure exerted by the clamping plates on the hose, ensuring that the hose will not slip due to insufficient clamping force or be damaged due to excessive clamping force during testing. The connection method of the second bolt increases the overall structural strength of the fixing head, making it stable during high-tensile testing, and providing solid technical support for reliable testing of the axial tensile strength of polyurethane high-pressure flat hoses.

[0038] In the embodiments provided by this utility model, a plurality of threaded holes are arranged at equal intervals.

[0039] Specifically, the evenly spaced threaded holes allow the second bolt to apply pressure uniformly, ensuring a more balanced force on the clamping plate when holding the hose. This ensures consistent clamping force across all parts of the hose during testing, preventing deformation or damage due to uneven force and guaranteeing the accuracy and reliability of the test results. In practical use, the evenly spaced threaded hole structure also enhances the overall structural strength and stability of the fixing head, making it less prone to deformation or loosening during high-tensile testing, providing a reliable guarantee for accurate testing of the axial tensile strength of polyurethane high-pressure flat hoses.

[0040] The reinforcing layer of this polyurethane high-pressure flat hose is made using a high-strength industrial polyester filament twill weave process. It is widely used in shore-to-ship oil transport, offshore floating oil pipelines, and fertilizer towing hoses for large agricultural machinery. It has a high axial tensile strength, typically 100KN to 200KN (10 to 20 tons). This hose is made of polymer materials, and during axial tensile strength testing, the polyurethane adhesive layer and intermediate layer must not show damage or mechanical shear. This invention effectively solves the problem of rigid and flexible transition connection between the hose and the metal test joint and can accurately test the axial tensile strength of the product.

[0041] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0042] Although embodiments of this utility model have been disclosed above, it is not limited to the applications listed in the specification and embodiments. It can be applied to various fields suitable for this utility model. Other modifications can be readily implemented by those skilled in the art. Therefore, without departing from the general concept defined by the claims and their equivalents, this utility model is not limited to the specific details and examples shown and described herein.

Claims

1. A special connection connector for testing the tensile strength of polyurethane high-pressure flat hoses, characterized in that, include: The fixing head includes an upper clamping plate, a lower clamping plate, and a first bolt. The upper clamping plate and the lower clamping plate are recessed on opposite sides, and the recessed areas are provided with a number of grooves. The upper clamping plate and the lower clamping plate are provided with connecting holes on both sides, and the connecting holes of the upper clamping plate and the lower clamping plate are in corresponding positions. The first bolt fixes the upper clamping plate and the lower clamping plate through the connecting holes. The mold core is located between the upper clamping plate and the lower clamping plate. The mold core has a number of protrusions, and the positions of the protrusions and the grooves are one-to-one. The surface of the mold core matches the concave parts of the upper clamping plate and the lower clamping plate.

2. The special connection connector for tensile strength testing of polyurethane high-pressure flat hose as described in claim 1, characterized in that, The mold core is flat and round.

3. The special connection connector for tensile strength testing of polyurethane high-pressure flat hose as described in claim 1, characterized in that, The depth of the groove is between 1.2 mm and 1.5 mm.

4. The special connection connector for tensile strength testing of polyurethane high-pressure flat hose as described in claim 3, characterized in that, The groove is semi-circular or frustum-shaped.

5. A special connection connector for testing the tensile strength of polyurethane high-pressure flat hose as described in claim 1, characterized in that, Several of the aforementioned protrusions are arranged at equal intervals.

6. A special connection connector for testing the tensile strength of polyurethane high-pressure flat hose as described in claim 1, characterized in that, Both the upper and lower clamping plates are provided with several threaded holes, and a second bolt is connected inside each threaded hole.

7. A special connection connector for testing the tensile strength of polyurethane high-pressure flat hose as described in claim 6, characterized in that, Several threaded holes are arranged at equal intervals.

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