Strength detection mechanism for polyurethane hose processing

Abstract

The application relates to the technical field of material detection, in particular to a strength detection mechanism for polyurethane hose processing, which comprises a base, a detection rack, a clamping part and a detection part, the detection part comprises a driving mechanism and a sensing detection unit, the sensing detection unit comprises a conductive terminal and a signal monitoring module, when strength is detected, the conductive terminal penetrates through the hose wall and is in conductive contact with the internal metal reinforcing layer; the driving mechanism drives the relative movement of the clamping part to apply a detection load, the signal monitoring module monitors the electric signal in real time, and based on the electric signal mutation caused by the fracture of the metal reinforcing layer, the current driving parameters of the driving mechanism are instantaneously intercepted to generate the structural strength data of the hose to be detected; the application directly feeds back the failure state of the internal framework through the electric signal, effectively eliminates the interference of the deformation buffer of the outer polyurethane material, realizes the accurate capture of the strength failure critical point of the polyurethane hose, and significantly improves the detection precision and data reliability of the strength detection mechanism.

Description

Technical Field

[0001] This invention relates to the field of materials testing technology, and in particular to a strength testing mechanism for polyurethane hose processing. Background Technology

[0002] Polyurethane hoses, due to their excellent wear resistance, often have a metal reinforcement layer woven inside to form a "flexible on the outside and rigid on the inside" composite structure. When they are manufactured and shipped, their ultimate strength needs to be tested through destructive tests such as mechanical tension or torsion. Most existing strength testing institutions monitor changes in force values ​​through external sensors or observe surface fractures using visual means, and use this as the basis for judging the strength data of the hose to achieve the strength testing of polyurethane hoses.

[0003] However, existing strength testing institutions have significant detection lag: because the elastic elongation of the outer polyurethane layer is much higher than that of the inner metal layer, the internal skeleton will break under overload before the outer layer when subjected to load; and due to the visual obstruction and deformation buffering of the thick coating layer, the institution has difficulty penetrating the pipe wall to capture the critical point of "hidden fracture" of the internal skeleton.

[0004] This results in the testing agency obtaining destructive load data that is usually the hysteresis data after the entire hose is torn, which cannot accurately reflect the true failure limit of the underlying skeleton and cannot meet the precise testing requirements of high-performance hoses. Consequently, the testing accuracy is inaccurate and the scope of application and effectiveness of the testing agency are limited. Summary of the Invention

[0005] The main objective of this invention is to provide a strength testing mechanism for polyurethane hose processing, aiming to at least solve one of the aforementioned technical problems existing in the prior art.

[0006] To achieve the above objectives, the present invention provides a strength testing mechanism for polyurethane hose processing, including a base and a testing frame disposed on the base, wherein the testing frame is provided with opposing clamping parts and a testing part for testing the hose to be tested; The clamping part is used to clamp the hose to be tested; The detection unit includes a drive mechanism and a sensing detection unit. The power output end of the drive mechanism is connected to the clamping part and is used to drive the corresponding clamping part to perform axial relative displacement or circumferential rotation. The sensing and detection unit includes conductive terminals and a signal monitoring module. The conductive terminals are connected to an external power supply and are disposed on the clamping part. When the clamping part clamps the hose to be tested, the conductive terminals pass through the wall of the hose to be tested and make conductive contact with the metal reinforcement layer inside it. The signal monitoring module is located on the detection frame and is electrically connected to the conductive terminals and the drive mechanism respectively. When performing strength testing on the hose under test, the drive mechanism drives the clamping part to move relative to each other to apply a test load to the hose under test. The signal monitoring module monitors the electrical signal of the conductive terminal and, based on the sudden change in electrical signal caused by the fracture of the metal reinforcement layer, obtains the drive parameters currently output by the drive mechanism in real time to generate structural strength data of the hose under test.

[0007] Furthermore, the clamping part includes a rotary flange and a support mandrel disposed on the central axis of the rotary flange, as well as a plurality of clamping members arranged in an array outside the support mandrel. The plurality of clamping members are slidably engaged with the rotary flange, and the clamping ends of the clamping members face the support mandrel.

[0008] Furthermore, the clamping member includes a clamping seat and a clamping pad. The bottom clamping surface of the clamping pad is adapted to the outer periphery of the tube wall of the hose to be tested, and the bottom clamping surface of the clamping pad is also provided with a tapered clamping protrusion extending along its length. A hydraulic chamber is provided inside the clamping seat. The hydraulic chamber is connected to the clamping pad through a piston plate. The hydraulic chambers in each clamping seat are connected to each other through a connecting pipe.

[0009] Furthermore, the conductive terminal is correspondingly disposed on the bottom clamping surface of the clamping tile, and the conductive terminal includes an insulating base and a puncture probe, wherein the puncture probe and the insulating base are ball-jointed by a ball joint.

[0010] Furthermore, the ball joint includes a ball socket and a ball head disposed inside the insulating base. The ball head is fixed to the end of the puncture probe and embedded inside the ball socket. A circumferentially distributed reset spring is provided between the ball socket and the ball head. One end of each reset spring is fixed to the inner wall of the ball socket, and the other end elastically abuts against the surface of the ball head. The inner diameter of the opening of the ball socket is larger than the outer diameter of the rod of the puncture probe.

[0011] Furthermore, the side of the rotary flange that slides with the clamping member is provided with a plurality of radially extending grooves, the clamping seat is correspondingly slidably embedded in the grooves, and the side of the clamping seat away from the supporting spindle is connected to a pneumatic pushing mechanism mounted on the surface of the rotary flange.

[0012] Furthermore, an anti-detachment sealing mechanism is provided on the outside of the support mandrel. The anti-detachment sealing mechanism includes a fixed retaining ring and a sealing expansion ring. The fixed retaining ring is fixedly sleeved on the outside of the support mandrel and corresponds to the position of the clamping member. The sealing expansion ring is located on the side of the fixed retaining ring that is relatively close to the free end of the support mandrel. When the hose to be tested is sleeved outside the support mandrel for strength testing, the end of the hose to be tested is clamped and fixed to the clamping member by the fixing retaining ring, and the inner wall of the hose to be tested is in contact with the sealing expansion ring.

[0013] Furthermore, the anti-detachment sealing mechanism also includes a follower ring, which is slidably sleeved on the outside of the support mandrel and near its end position, and its side facing the fixed retaining ring is connected to the sealing expansion ring. The side of the follower ring opposite to the sealing expansion ring is provided with an inclined pressure portion that extends to the outside of the end of the support mandrel. The inclined pressure section is inclined to match the conical transition section formed when the hose under test is subjected to axial tension and contraction. When the follower ring is subjected to the wedge-shaped extrusion force generated by the conical transition section, it slides towards the fixed retaining ring to compress the sealing expansion ring to expand radially outward.

[0014] Furthermore, the outer periphery of the fixed retaining ring is provided with an inner support abutment at the position of the conical clamping protrusion of the clamping tile; When the clamping member clamps the hose to be tested, the inner support abutment member supports the inner wall of the hose to be tested, so as to cooperate with the conical clamping protrusion of the clamping tile on the outside of the hose to be tested.

[0015] Furthermore, a medium filling port extending axially is provided at the end of one of the supporting mandrels, and the medium filling port is connected to an external medium through a pipeline.

[0016] Compared with the prior art, the beneficial effects that the present invention can achieve include at least the following: 1. This invention establishes direct conductive contact between the conductive terminals of the sensing and detection unit and the inner metal reinforcement layer by piercing the tube wall. It uses the resistance change or open circuit state of the electrical signal circuit to reflect the structural integrity of the hose in real time. This effectively eliminates the deformation buffering effect caused by the high elongation of the outer polyurethane material and overcomes the detection lag defect caused by relying on macroscopic visual judgment in the prior art. Thus, it can accurately obtain the real mechanical limit data at the moment when the bottom metal reinforcement layer breaks.

[0017] 2. This invention utilizes fluid connectivity to construct a dynamic pressure equalization mechanism for radial clamping force by configuring interconnected hydraulic chambers within each clamping seat. This eliminates the risk of eccentric pressure caused by local wall thickness tolerances in the hose. In conjunction with the conical clamping ridge at the bottom, uniform compression and anti-slip interlocking along the circumference of the hose are achieved without compromising the hose body, significantly improving the clamping stability of the equipment during load testing.

[0018] 3. This invention uses a ball joint and a reset spring to movably mount the puncture probe within an insulating base, giving the probe the ability to slightly deflect according to the arc contour of the internal metal wire when it pierces the tube wall. This not only avoids the physical risk of the probe breaking due to rigid contact with an uneven surface and ensures the reliability of conductive contact, but also allows it to automatically reset using the potential energy of the spring after the test is unloaded, thus extending the service life of the core monitoring element.

[0019] 4. This invention utilizes the follower ring and the inclined pressure section to capture the radial contraction deformation generated when the hose under test is stretched, and converts it into axial extrusion force on the sealing expansion ring. This forces the sealing ring to expand radially outward and press against the inner side of the pipe wall. This ingenious physical transmission structure transforms the tensile destructive force into an anti-detachment clamping force, effectively overcoming the end slippage and sealing problems that are prone to occur when polymer elastic pipes are subjected to extreme axial loads.

[0020] 5. The present invention provides an inner support abutment on the outer periphery of the fixed retaining ring, and uses a pneumatic circuit composed of a compression airbag and a lifting airbag to convert the external clamping action into the active radial lifting force of the inner support, so as to force the local tube wall to undergo geometric deformation and embed into the interlocking groove. By constructing a rigid physical interlocking, the pull-out resistance of the end is greatly enhanced without damaging the hose substrate.

[0021] 6. By opening a medium filling port inside the support mandrel to connect with the outside, this invention enables the simultaneous injection of a fluid medium at a set pressure into the cavity while performing axial mechanical tensile testing. This realistically simulates the multidimensional stress state of the hose under test in a pressurized service environment, ensuring the reliability and integrity of the comprehensive destructive test data. Attached Figure Description

[0022] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the accompanying drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0023] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a side view of the rotary flange of the present invention. Figure 3 This is a schematic diagram of the internal structure of the clamping seat of the present invention, intended to show the hydraulic cavity and the clamping pad; Figure 4 This is a partial structural diagram of the anti-detachment sealing mechanism of the present invention, intended to illustrate the clamping state of the hose under test; Figure 5This is a partially enlarged structural schematic diagram of the conductive terminal of the present invention, intended to illustrate the ball joint; Figure 6 This is a partial structural schematic diagram of the anti-detachment sealing mechanism of the present invention, intended to demonstrate the clamping and stretching state of the hose under test.

[0024] In the above-mentioned figures, the reference numerals are as follows: 1. Base; 2. Testing frame; 21. Vertical support frame; 31. Rotary flange; 311. Slide groove; 312. Pneumatic pushing mechanism; 32. Support spindle; 321. Fixed retaining ring; 3211. Inner support abutment; 32121. Lifting hole; 32122. Lifting block; 32123. Lifting airbag; 32124. Compression airbag; 322. Sealing expansion ring; 323. Follower ring; 324, inclined pressure section; 325, medium filling port; 331, clamping seat; 3311, hydraulic chamber; 3312, piston plate; 3313, connecting pipeline; 332, clamping tile; 341, ball socket; 342, ball head; 343, reset spring; 41, conductive terminal; 411, insulating base; 412, puncture probe; 42, signal monitoring module; 51, linear power mechanism; 52, rotary power mechanism.

[0025] The realization of the objective, functional features and advantages of the present invention will be further explained below with reference to the embodiments and the accompanying drawings. Detailed Implementation

[0026] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0028] In this invention, unless otherwise explicitly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral part; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0029] Furthermore, if the embodiments of the present invention involve descriptions using terms such as "first," "second," etc., these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Moreover, 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 system 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 system. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or system that includes that element.

[0030] Example: Understandably, in existing polyurethane hose strength testing, traditional testing agencies typically collect stress data on the hose body using externally placed sensors. However, technical personnel have discovered in their analysis of existing technologies that, due to the inconsistency in mechanical properties between the outer polyurethane (flexible) material and the internal metal reinforcement layer of the high-performance polyurethane hose, the internal metal reinforcement layer will physically fracture before the outer hose wall during load application. At this time, the outer polyurethane hose wall still maintains a macroscopically continuous state and produces a deformation buffering effect, resulting in the stress data collected by the external sensors not being able to directly reflect the failure state of the internal metal reinforcement layer.

[0031] Therefore, this embodiment provides a strength testing mechanism for polyurethane hose processing, which is used to evaluate the mechanical failure and strength performance of hoses with an internal metal reinforcement layer and an outer polyurethane coating. Specifically, it utilizes a conductive terminal 41 that can penetrate the polyurethane coating and make conductive contact with the metal reinforcement layer inside the hose, in conjunction with a signal monitoring module 42 to monitor the circuit electrical signal in real time. This solves the technical problem that conventional testing methods struggle to obtain instantaneous mechanical data on the fracture of the internal reinforcement layer of the polyurethane hose, leading to inaccurate test results and limited effectiveness.

[0032] For example, please refer to Figure 1 and Figure 2Its structure mainly includes a base 1 and a testing frame 2 set on the base 1. Two sets of clamping parts for fixing and supporting the hose under test and a testing part for strength testing of the hose under test are correspondingly set on the testing frame 2. In terms of spatial layout, the two sets of clamping parts are arranged opposite to each other so that the hose under test can be placed between them and achieve synchronous binding at both ends. The testing part further includes a driving mechanism and a sensing and detection unit. The driving mechanism is poweredly connected to the clamping parts to drive the corresponding clamping parts to perform axial relative displacement (for tensile testing) or circumferential rotation (for torsion testing) along the base 1.

[0033] The core of the sensing and detection unit lies in the conductive terminal 41 and the signal monitoring module 42. In the specific implementation stage, the conductive terminal 41 is connected to an external power source, and its installation position corresponds to the wall of the hose to be tested. Thus, while the clamping part performs the clamping action, it drives the conductive terminal 41 to pass through the polyurethane tube wall and establish electrical contact with its internal metal reinforcement layer (such as metal wire). Figure 4 As shown in the figure, the metal skeleton, which was originally in a physically encased state, is connected to the real-time electrical monitoring circuit of the signal monitoring module 42, which is located on the detection frame 2 and further electrically connected to the drive mechanism.

[0034] Thus, this solution, through the conductive terminal 41 designed above and the signal monitoring module 42, constructs a dynamic monitoring system in which the failure judgment signal can spontaneously change with the change in the integrity of the internal skeleton structure. That is, in the specific detection process, the drive mechanism continuously applies an increasing detection load to the clamping part, so that the stress state inside the hose under test continues to rise with the increase of displacement or rotation angle. Since there are physical differences between the polyurethane coating layer and the metal reinforcement layer in terms of yield strength and elongation, the signal monitoring module 42 monitors the electrical continuity state of the metal reinforcement layer in real time through the conductive terminal 41.

[0035] When the test load on the hose under test reaches a critical value, causing the internal metal reinforcement layer to physically break due to overload, the originally connected electrical control circuit will generate an electrical signal jump (such as current interruption or voltage fluctuation) due to the destruction of the skeleton physical structure. At this time, the signal monitoring module 42 uses the jump signal as a logic trigger command to instantly acquire and record the drive parameters of the drive mechanism at the current timestamp (such as real-time tensile peak or torque value), and processes the drive parameters through the built-in conventional mechanical conversion program to generate the structural strength data of the hose under test.

[0036] Based on this, this embodiment uses the electrical response characteristics of the metal reinforcement layer's physical failure state through the sensing and detection unit to eliminate load buffering interference caused by the elastic deformation of the outer polyurethane material during the detection process. Furthermore, since this solution uses the electrical signal jump of the internal metal reinforcement layer as the reference trigger signal for data interception, this synchronous acquisition mechanism ensures that the detection agency can obtain the real driving parameters of the bottom skeleton at the failure critical point in real time, thereby significantly improving the accuracy of the detection agency's composite hose strength detection data.

[0037] This solution enables direct monitoring of the fracture state of the internal reinforcing layer of the polyurethane hose, avoiding the judgment error caused by the lag of external macroscopic deformation in conventional testing. This testing method does not depend on the damage to the surface of the hose, which not only ensures the consistency of the structural strength judgment results of the testing agency, but also improves the overall performance of the testing agency in continuous destructive testing, providing a more accurate testing agency for the strength testing of high-performance polyurethane hoses.

[0038] In some embodiments, the testing frame 2 includes two opposing vertical support frames 21. Figure 1 As shown in the diagram, one of the vertical support frames 21 is slidably connected to the base 1 (for example, its bottom is connected to the base 1 via a linear guide rail to form a linear sliding pair), and two clamping parts are correspondingly arranged on opposite sides of the two vertical support frames 21 to construct a testing station between the two vertical support frames 21.

[0039] The driving mechanism includes a linear power mechanism 51 and a rotary power mechanism 52. The linear power mechanism 51 is horizontally mounted on the power position of the base 1, and its power output end is physically connected to the vertical support frame 21 that is slidably arranged. When performing tensile strength testing, the linear power mechanism 51 drives the vertical support frame 21 to generate controlled axial displacement along the linear guide rail, thereby driving the clamping part to apply tensile load to the polyurethane hose under test through the support frame. The rotary power mechanism 52 is integrated on the back side of one of the vertical support frames 21. Its power output shaft passes through the support frame through the rotary flange 31 and is connected to the corresponding clamping part. When performing torsional strength testing, the rotary power mechanism 52 drives the corresponding clamping part to rotate around the central axis of the polyurethane hose under test through the rotary flange 31, thereby outputting a controlled torsional torque.

[0040] For example, such as Figure 1 As shown, the linear power mechanism 51 can use a servo motor in conjunction with a ball screw pair, and use the rotation of the screw to drive the nut seat and support frame to generate high-precision linear translation; while the rotary power mechanism 52 can use a geared motor or a stepper motor. Thus, through the independent or combined actions of the above two sets of linear and rotary power modules, the detection mechanism can simulate the multi-dimensional stress state of the hose under test in actual working conditions.

[0041] In some embodiments, the signal monitoring module 42 can employ existing electrical signal acquisition and processing equipment. For example, it may include an industrial data acquisition card, a multimeter monitoring unit, or an analog / digital input module of a programmable logic controller (PLC). Specifically, the signal monitoring module 42 forms a monitoring circuit with the metal reinforcement layer inside the polyurethane hose under test via the conductive terminal 41, and uses existing electrical parameter measurement technologies (such as continuity detection, voltage drop measurement, or impedance analysis) to capture electrical signal fluctuations in the circuit in real time. Furthermore, when the metal reinforcement layer breaks, causing a momentary jump in the electrical signal, the module intercepts the current driving parameters through a built-in logic triggering mechanism, thereby achieving synchronous locking of mechanical data and the moment of failure.

[0042] Furthermore, to ensure the polyurethane hose possesses the target level of pressure resistance and structural rigidity, in this embodiment, the metal reinforcement layer can be made of conductive metal materials such as high-strength steel wire, stainless steel wire, or copper wire. During manufacturing, this metal reinforcement layer can be wrapped around the outer wall of the polyurethane inner tube using a braiding machine in a cross-braiding manner, or it can be spirally wound into the middle layer of the hose wall. This not only supports the mechanical strength of the hose but also ensures the electrical continuity of the metal reinforcement layer in both the circumferential and axial directions, thereby enabling the conductive terminal 41 to be effectively connected to the monitoring circuit at any contact point after piercing the hose wall.

[0043] Based on the above embodiments, as a further optional implementation, such as Figure 2 As shown, the clamping part includes a rotary flange 31 and a support spindle 32 disposed on the central axis of the rotary flange 31, as well as a plurality of clamping members arranged in an array outside the support spindle 32. The plurality of clamping members are slidably engaged with the rotary flange 31, and the clamping ends of the clamping members face the support spindle 32.

[0044] Understandably, in order to ensure the displacement synchronization of the polyurethane hose under extreme tension or torsion conditions and to prevent radial instability at the end, the clamping part of the above solution adopts a structure that combines inner core support and radial sliding clamping.

[0045] Furthermore, in a specific embodiment, the support mandrel 32 is fixedly mounted at the axis of the rotary flange 31, and its outer diameter is adapted to the inner diameter of the polyurethane hose to be tested. Thus, at the start of the test, the end of the hose to be tested is sleeved on the support mandrel 32, and the support mandrel 32 provides internal compressive stress to the hose to prevent the hose from undergoing centripetal geometric collapse during subsequent clamping, thereby ensuring the coaxiality of load transmission. The multiple clamping members are arranged in a circumferential array around the support spindle 32 and are in sliding fit with the rotary flange 31. Their clamping ends all face the center. Therefore, when the clamping action is performed, the multiple clamping members can simultaneously generate radial sliding displacement along the disc surface of the rotary flange 31 towards the support spindle 32 under the action of the driving force, so that their clamping ends fit against the outer wall of the hose to be tested. This results in the end wall of the hose to be tested being constrained within the annular space formed by the clamping members and the support spindle 32, thereby achieving a tight clamping of the hose to be tested.

[0046] Based on the above embodiments, in order to further ensure that the end of the hose under test will not slip off when subjected to extreme tensile or torsional loads, and that the clamping force in all directions of the hose circumference can be evenly distributed.

[0047] In this embodiment, further optional implementation methods are also proposed, in Figure 3 and Figure 4 As shown in the figure, the clamping member includes a clamping seat 331 and a clamping tile 332. The bottom clamping surface of the clamping tile 332 is adapted to the outer periphery of the tube wall of the hose to be tested, and the bottom clamping surface of the clamping tile 332 is also provided with a tapered clamping protrusion extending along its length. A hydraulic chamber 3311 is provided inside the clamping seat 331. The hydraulic chamber 3311 is connected to the clamping tile 332 through a piston plate 3312. The hydraulic chambers 3311 in each clamping seat 331 are connected to each other through a connecting pipe 3313.

[0048] In practical implementation, this solution utilizes the internal fluid connectivity between each hydraulic chamber 3311 to achieve self-balanced distribution of radial clamping force, while using the conical clamping ridge to compress and tighten the outer polyurethane material of the hose under test.

[0049] Clearly, based on the above structure, this solution not only eliminates the risk of eccentric pressure caused by the pipe wall thickness tolerance through the hydraulic pressure equalization mechanism, but also greatly improves the anti-slip capability of the hose under test through the mechanical pressing and squeezing of the convex structure and the outer wall of the hose, ensuring the stability of the strength testing mechanism during testing.

[0050] During testing, as the clamping seat 331 radially retracts towards the central axis, the clamping pad 332 at the front end first abuts against the outer wall of the hose. Based on the closed fluid system formed by the internal hydraulic chamber 3311 and the connecting pipe 3313 of each clamping seat 331, when a clamping pad 332 is subjected to a large radial reaction force due to the local outer diameter tolerance of the hose, the reaction force pushes the corresponding piston plate 3312 to compress the hydraulic chamber 3311, so that the fluid in the chamber flows to other hydraulic chambers 3311 through the connecting pipe 3313, thereby pushing the clamping pad 332, which has not yet fully adhered, to continue feeding.

[0051] This dynamic fluid pressure balance mechanism allows the arrayed clamping pads 332 to adapt to dimensional deviations on the hose surface, outputting uniform clamping force along the hose circumference. This prevents the hose from crushing due to excessive local stress. Furthermore, under the uniform clamping force, the conical clamping ridges at the bottom of the clamping pads 332 are stably embedded in the polyurethane material of the outer layer of the hose under test. This creates a stable compression interlock between the clamping pads 332 and the hose wall through the conical clamping ridges at their bottom. During subsequent tensile testing, this interlocking resists the end slippage tendency caused by hose thinning under tension, ensuring that the hose remains firmly clamped throughout the test. This guarantees the stability of the strength testing mechanism, ensuring accurate data and improving the precision of the test results.

[0052] In some embodiments, the hydraulic cavity 3311 is preferably a cylindrical cylinder channel formed inside the clamping seat 331, such as... Figure 3 As shown, it is filled with an incompressible hydraulic transmission medium (exemplarily, industrial anti-wear hydraulic oil or water-glycol flame retardant fluid can be used). In specific implementation, the hydraulic chambers 3311 are fluidly connected through high-pressure flexible oil pipes to accommodate the dynamic spatial displacement of the clamping seat 331 when it is radially retracted. The piston plate 3312 serves as a conversion component for transmitting mechanical thrust and hydraulic force, and its outer periphery is fitted with existing high-pressure sealing components to maintain the pressure holding state of the fluid system.

[0053] In some embodiments, the cross-section of the tapered clamping ridge is a tapered inverted trapezoid or triangle, and its maximum height protruding outward from the bottom of the clamping tile 332 is strictly less than the radial wall thickness of the outer polyurethane material of the hose under test; this ensures that when uniform clamping is performed, the tapered clamping ridge is only embedded in the outer polyurethane layer and forms an anti-slip interlock, without cutting or damaging the metal reinforcement layer that is wrapped inside, thereby avoiding abnormal interruption of the electrical monitoring circuit due to non-testing physical damage.

[0054] Based on the above embodiments, as a further preferred implementation, such as Figure 4 and Figure 5 As shown, the conductive terminal 41 is correspondingly disposed on the bottom clamping surface of the clamping tile 332. The conductive terminal 41 includes an insulating base 411 and a puncture probe 412. The puncture probe 412 and the insulating base 411 are ball-connected by a ball joint.

[0055] In the above scheme, by setting the conductive terminal 41 on the bottom clamping surface of the clamping tile 332, it is realized that during the clamping and testing process, when the clamping tile 332 is attached to the wall of the hose to be tested, the conductive terminal 41 can be simultaneously driven to insert into the inside of the hose wall and contact the metal reinforcement layer. Furthermore, by setting the ball joint, it is ensured that the puncture probe 412 has the necessary structural flexibility when performing the puncture action, so that it can adjust its own posture in real time according to the physical feedback of the puncture point position.

[0056] Obviously, in the specific implementation process, the puncture probe 412 is fed radially towards the center along with the clamping tile 332 and pierces the outer layer of polyurethane. Since the metal reinforcement layer inside the tubing to be tested is usually composed of cross-woven or spirally wound metal wires, its microscopic surface presents a continuous undulating arc shape. Therefore, when the tip of the puncture probe 412 contacts the non-central point of the metal wire, the probe tip will be subjected to the lateral component force generated by the curved surface of the metal wire. At this time, based on the multi-directional rotational support provided by the ball joint, the puncture probe 412 can generate a slight deflection around the ball joint as the axis, guiding the probe tip to slide along the arc contour of the metal wire until a force-balanced fit is achieved.

[0057] Furthermore, this flexible design allows the puncture probe 412 to adapt to the arrangement of the internal metal wires, preventing the probe from breaking under strong pressure due to rigid contact with an uneven surface, and significantly increasing the effective electrical contact area between the probe and the metal reinforcement layer. Simultaneously, the insulating base 411 electrically isolates the puncture probe 412 from the metal clamping tile 332, shielding it from potential interference from external mechanical structures and ensuring the purity of the captured electrical signal transitions. This, in turn, ensures that the strength testing mechanism can accurately pinpoint the critical load value at which the metal reinforcement layer experiences physical failure.

[0058] In a further embodiment, the specific structure of the ball connector is as follows: Figure 5 As shown in the diagram, it includes a ball socket 341 and a ball head 342 disposed inside the insulating base 411. The ball head 342 is fixed to the end of the puncture probe 412 and embedded inside the ball socket 341. A circumferentially distributed reset spring 343 is provided between the ball socket 341 and the ball head 342. One end of each reset spring 343 is fixed to the inner wall of the ball socket 341, and the other end elastically abuts against the surface of the ball head 342. The inner diameter of the opening of the ball socket 341 is larger than the outer diameter of the rod of the puncture probe 412.

[0059] Based on the above scheme, the ball head 342 at the end of the puncture probe 412 is fitted into the ball socket 341 of the insulating base 411 to form a movable fulcrum. The reserved size difference between the inner diameter of the opening of the ball socket 341 and the outer diameter of the probe rod provides physical clearance space for the probe rod to deflect at an angle. When the puncture probe 412 encounters a non-flat metal wire and undergoes adaptive deflection upon piercing the tube wall, the ball head 342 rotates accordingly within the ball socket 341 and directionally compresses the reset spring 343 on the side of its deflection direction, causing it to undergo elastic deformation. When the single destructive test ends, the clamping pad 332 is released and detaches from the tube wall of the tested tube, the external lateral force on the probe tip disappears, and the reset spring 343, which is in a compressed state, releases its elastic potential energy. Through the balanced elastic force in the circumferential direction, it pushes the ball head 342 to reset, thereby driving the puncture probe 412 to automatically return to the initial vertical center state, providing a precise and repeatable position reference for the next clamping and puncture action.

[0060] Based on this, this embodiment achieves adaptive bonding of the puncture probe 412 to the non-flat metal surface and automatic repositioning after testing through the cooperation of the ball joint and the reset spring 343, effectively avoiding probe breakage. At the same time, the insulating base 411 blocks the noise interference of the equipment body to the internal electrical circuit, which takes into account both the mechanical durability of the testing mechanism and the purity of signal acquisition, and further ensures the accurate generation of extreme intensity data, thereby effectively improving the overall operational stability of the testing mechanism and the final detection accuracy of the test data.

[0061] As a further preferred implementation method, in Figure 2 As shown in the figure, the side of the rotary flange 31 that slides with the clamping member has a plurality of radially extending grooves 311, the clamping seat 331 is correspondingly slidably embedded in the grooves 311, and the side of the clamping seat 331 away from the support spindle 32 is connected to the pneumatic push mechanism 312 mounted on the surface of the rotary flange 31.

[0062] In the above scheme, multiple slide grooves 311 are arranged in a circumferential array along the radial direction of the rotary flange 31. The clamping seat 331 is embedded in the corresponding slide groove 311 to limit the offset of the clamping seat 331 by utilizing the inner wall of the slide groove 311, ensuring its linear sliding trajectory along the radial direction. The pneumatic push mechanism 312 is located on the flange rotary disc and connected to the clamping seat 331 to provide a pushing force to the clamping seat 331. After activation, it can slide through the clamping seat 331 in the slide groove 311, thereby driving the clamping pad 332 at the front end to close synchronously, completing the radial compression and stable clamping of the hose to be tested. Through the array arrangement of multiple pneumatic push mechanisms 312, a stable and uniform pressure holding clamping force is provided when the clamping pad 332 presses the polyurethane hose, thereby effectively improving the clamping adaptability of the testing mechanism to hoses of different sizes and specifications.

[0063] In some embodiments, the pneumatic actuation mechanism 312 may employ a standardized pneumatic actuator, such as a miniature cylinder, which, during specific assembly, has its base 1 fixedly installed inside the slide groove 311 or on the rotary flange 31, and its power output end extends radially and is fixedly connected to the clamping seat 331.

[0064] As a further preferred embodiment, it is understood that, in order to prevent the polyurethane hose under test from slipping off the surface of the support mandrel 32 when subjected to axial tensile load, and to eliminate the radial gap between the hose and the support mandrel 32 after the hose is deformed by tension, this embodiment provides an anti-slip sealing mechanism on the outside of the support mandrel 32.

[0065] Specifically, such as Figure 4 As shown, its structure includes a fixed retaining ring 321 and a sealing expansion ring 322. The fixed retaining ring 321 is fixedly sleeved on the outside of the support spindle 32 and corresponds to the position of the clamping member. The sealing expansion ring 322 is disposed on the side of the fixed retaining ring 321 that is relatively close to the free end of the support spindle 32. When the hose to be tested is sleeved outside the support mandrel 32 for strength testing, the end of the hose to be tested is clamped and fixed to the clamping member by the fixing retaining ring 321, and the inner wall of the hose to be tested is in contact with the sealing expansion ring 322.

[0066] In the specific implementation process, the spatial position of the fixed retaining ring 321 corresponds to the radial clamping area of ​​the external clamping member. Thus, when the clamping member is closed, the fixed retaining ring 321 provides radial support force to the inner wall of the hose, so that the end of the hose is rigidly clamped between the external clamping member and the internal fixed retaining ring 321. The mechanical clamping force resists the axial tensile load and restricts the axial displacement of the hose.

[0067] Meanwhile, the sealing expansion ring 322 located on one side of the free end of the support mandrel 32 extends into the inner cavity of the hose under test. After the hose under test is fitted, the sealing expansion ring 322 forms a tight interference seal with the inner wall of the hose due to its own material properties. Thus, during the tensile (or torsional) test of the hose under test, when the hose under test is subjected to force deformation and elongation and undergoes radial contraction deformation, the sealing expansion ring 322 undergoes elastic deformation to fill the gap between the inner wall of the hose and the surface of the support mandrel 32.

[0068] Furthermore, based on the above embodiments, it should be noted that the anti-detachment sealing mechanism further includes a follower ring 323. The follower ring 323 is slidably sleeved on the outside of the support spindle 32 and near its end position, and its side facing the fixed retaining ring 321 is connected to the sealing expansion ring 322. The side of the follower ring 323 opposite to the sealing expansion ring 322 is provided with an inclined pressure-bearing portion 324 extending to the outside of the end of the support spindle 322, specifically as follows... Figure 6 As shown; The hose under test is subjected to axial tensile load, which causes radial contraction and forms a tapered transition section near the follower ring 323. The inclined pressure portion 324 of the follower ring 323 slides towards the fixed retaining ring 321 under the wedge extrusion force generated by the tapered transition section, so as to compress the sealing expansion ring 322 to expand radially outward.

[0069] Understandably, as a polymer elastomer, the polyurethane test hose will inevitably undergo dynamic deformation, including longitudinal elongation and radial contraction, when subjected to axial tensile loads. This contraction deformation can easily cause the hose wall to detach from its original static clamping state, leading to slippage during the test. This results in an abnormal interruption of the strength test process, making the collected load data unable to reflect the hose's true stress limit. Furthermore, the sudden pressure relief during slippage can easily cause mechanical impact damage to the precision monitoring components inside the testing mechanism, reducing the accuracy of the test results and the service life of the testing mechanism.

[0070] Therefore, this embodiment specifically introduces the linkage structure of the aforementioned follower ring 323 to construct a dynamic compensation mechanism that can track pipe wall deformation in real time and actively enhance the anti-detachment clamping force using the deformation.

[0071] In practical implementation, when the hose under test is subjected to a high-intensity axial tensile load, the radial contraction of its body will form a tapered transition section with a gradually decreasing inner diameter near the end region of the follower ring 323. At this time, since the side of the follower ring 323 opposite to the sealing expansion ring 322 extends to the outer side of the end of the support mandrel 32 and forms an inclined pressure-bearing part 324, it will first contact the tapered transition section (in Figure 6 As shown in the diagram, with the continuous increase of tension, the inner wall of the tapered transition section pushes the inclined pressure portion 324, thereby generating a continuous wedge-shaped compressive force on the forward follower ring 323. Under the direct drive of this wedge-shaped compressive force, the follower ring 323 slides along the support spindle 32 towards the fixed retaining ring 321, thereby applying an axial compressive force to the sealing expansion ring 322 sandwiched between the follower ring 323 and the fixed retaining ring 321. After being axially compressed, the sealing expansion ring 322 is forced to expand and bulge radially outward, thereby actively pressing against and embedding itself into the inner wall of the hose under test with greater radial pressure, forming a tighter sealing contact with its inner wall.

[0072] Based on this, the above-mentioned solution, through the mechanical transmission of the follower ring 323, transforms the physical cause of conventional static clamping failure (i.e., radial contraction caused by tension on the pipe wall) into a mechanical driving force that strengthens the internal anti-detachment capability. By utilizing the positive feedback mechanical compensation mechanism generated by the tensile load itself, it achieves adaptive dynamic reinforcement of the anti-detachment clamping force, effectively overcoming the end slippage problem of high-elasticity pipes in extreme destructive testing, ensuring the safe operation of the testing equipment and the accurate acquisition of extreme value data. At the same time, this structure, through the active radial expansion and compression of the sealing expansion ring 322, not only improves the mechanical anchoring strength but also further enhances the interference seal reliability between the support mandrel 32 and the inner wall of the hose. This allows the sealing expansion ring 322 to maintain a seamless fit at the internal contact interface of the pipe cavity even when facing the severe tensile deformation of the high-elasticity pipe, forming a more robust sealing relationship.

[0073] In some embodiments, the follower ring 323 is sleeved on the outside of the mandrel through a clearance fit formed by its inner diameter and the outer diameter of the support mandrel 32, so as to realize free sliding along the axis of the support mandrel 32. To further ensure the linearity of sliding, the surface of the support mandrel 32 may be provided with a groove 311 along the axial direction, and the inner side of the follower ring 323 is provided with a slider that is slidably embedded in the groove 311.

[0074] Furthermore, the follower ring 323 has a ring-shaped structure, and its outer circumferential surface in contact with the hose under test is provided with anti-slip texture. This design aims to increase the friction between the follower ring 323 and the tapered transition section of the hose, enabling it to respond more sensitively to the axial thrust generated by the contraction of the hose wall. Simultaneously, the side of the follower ring 323 facing the sealing expansion ring 322 is set as a flat pressing surface to ensure that the axial pressure can be evenly applied to the end of the sealing expansion ring 322, thereby inducing it to produce stable radial expansion deformation.

[0075] Based on the above embodiments, as a preferred implementation method, the outer periphery of the fixing ring 321 is provided with an inner support abutment 3211 at the position corresponding to the conical clamping protrusion of the clamping tile 332, such as... Figure 4 and Figure 6 As shown; When the clamping member clamps the hose to be tested, the inner support abutment member 3211 supports the inner wall of the hose to be tested, so as to cooperate with the conical clamping protrusion of the clamping tile 332 on the outside of the hose to be tested.

[0076] In the aforementioned scheme, although a support mandrel 32 is provided to maintain the cavity shape of the hose to be tested, during the clamping process, since the surface of the support mandrel 32 is usually a flat cylindrical surface, when the conical clamping ridge of the external clamping tile 332 applies a local high pressure load to the pipe wall, the pipe wall material is prone to physical creep or avoidance to both sides of the ridge under the action of radial pressure, resulting in insufficient mechanical embedding depth between the ridge and the pipe wall, thus causing the clamping to fall off.

[0077] Therefore, in this embodiment, by setting an inner support abutment 3211 at the corresponding position, the inner support abutment 3211, during the clamping process, precisely aligns with the outer conical clamping ridge in the radial position, solving the problem of the lack of targeted counter-support for the pipe wall at the pressure point. Specifically, in actual implementation, the inner support abutment 3211, as a radially reinforcing structure located locally on the support mandrel 32, forms a targeted mechanical fit with the outer ridge, so that the pipe wall of the hose under test is forcibly locked within the dynamic narrow slit formed by the inner support abutment 3211 and the conical clamping ridge. As the clamping load is continuously applied, the inner support abutment 3211 provides a rigid reaction force reference for the inner side of the pipe wall and forces the outer ridge to embed deeper into the pipe wall material, thereby simultaneously constructing a local rigid interlocking interface on the inner and outer walls of the hose, generating extremely high static friction resistance.

[0078] In summary, this embodiment cleverly uses the radial coupling between the inner support abutment 3211 and the external structure to achieve localized high concentration and directional enhancement of clamping force without changing the overall fit relationship of the support spindle 32. This effectively compensates for the mechanical defect that the flat support surface cannot form an effective engagement with the irregular protrusion, and significantly improves the end clamping reliability in high load tensile tests.

[0079] In some preferred embodiments, the inner support abutment 3211 and the fixed retaining ring 321 are movably installed via a lifting member. The lifting member includes a lifting hole 32121, a lifting block 32122, and a lifting airbag 32123. The lifting airbag 32123 is connected to a compression airbag 32124 embedded in the slide groove 311 via a connecting pipe. The compression airbag 32124 is located at one end of the slide groove 311 away from the pneumatic pushing mechanism 312 and is connected to the clamping seat 331. It is filled with gas. The lifting hole 32121 is formed on the outer circumferential surface of the fixed retaining ring 321. The lifting block 32122 is slidably embedded in the lifting hole 32121 and its top extends to the outside of the lifting hole 32121 and is connected to the inner support abutment 3211. Figure 4 and Figure 6 It has also been shown in the middle.

[0080] Thus, when the pneumatic push mechanism 312 drives the clamping seat 331 to perform clamping motion along the slide groove 311 toward the hose to be tested, the clamping seat 331 can physically compress the compression airbag 32124 embedded therein during the movement within the slide groove 311. Since the compression airbag 32124 and the lifting airbag 32123 form a closed pressure circuit through the connecting pipe, the internal gas generated by the compression airbag 32124 under pressure quickly enters the lifting airbag 32123 through the connecting pipe.

[0081] As the lifting airbag 32123 receives gas and expands in volume, the resulting upward thrust acts directly on the lifting block 32122. Driven by air pressure, the lifting block 32122 overcomes its own weight and friction, sliding upwards along the guide direction of the lifting hole 32121. This, in turn, causes the inner support abutment 3211 connected to its top to displace radially outwards. At this point, the inner support abutment 3211 can further actively press against the inner wall of the hose under test, forming a counter-current compressive force with the conical clamping ridge pressed in from the outside, causing the hose wall to reach the predetermined deformation engagement state in a very short time.

[0082] This solution achieves simultaneous application of internal and external clamping forces through pneumatic linkage, enabling the inner support abutment 3211 to actively adhere to and press against the inner wall of the hose. This not only eliminates the need for an additional power source but also ensures precise coupling of the internal support force and the external clamping force in time and space. Through the combined squeezing force from the inside and outside, it effectively solves the problem of radial shrinkage caused by insufficient internal support in high-elasticity tubing, significantly improves the structural tightness of the clamping part, and greatly enhances the reliability of anti-detachment during strength testing.

[0083] It is also understandable that the connecting pipe in this solution is equipped with a two-way valve (not shown in the figure) to regulate the gas flow between the compression airbag 32124 and the lifting airbag 32123 and to prevent pressure mis-triggering. When the pneumatic pushing mechanism 312 drives the clamping seat 331 to reset outward, the compression airbag 32124 generates internal negative pressure under the combined action of the clamping seat 331's tension and its own elastic restoring force, thereby guiding the gas in the lifting airbag 32123 to flow back quickly through the two-way valve, so as to facilitate the subsequent replacement and testing of the hose to be tested.

[0084] In this embodiment, the top shape of the inner support abutment 3211 conforms to the inner wall contour of the hose under test, and an engagement notch is provided at the center of the top of the inner support abutment 3211. The radial position of the engagement notch corresponds to the clamping protrusion of the outer clamping tile 332. Thus, when the clamps are closed, the hose wall under test is partially embedded in the engagement notch under the pressure of the protrusion, creating a bidirectional locking effect in both the radial and axial directions through the resulting concave-convex embedding structure. This significantly enhances the anti-detachment capability of the clamping part without damaging the hose.

[0085] Based on the above embodiments, to further ensure that the hose under test can simulate the internal pressure environment under actual working conditions and obtain multi-dimensional strength data during strength testing, this solution specifically provides an axially extending medium filling port 325 at one end of one of the supporting mandrels 32, and the medium filling port 325 is connected to the external medium through a pipeline. Figure 1 As shown in the image.

[0086] Understandably, after the above-mentioned scheme achieves sealed contact between the inner wall of the hose under test and the sealing expansion ring 322, this embodiment can integrate a medium filling port 325 inside one of the support mandrels 32 to simultaneously apply a predetermined intensity of radial fluid pressure to the inside of the tube cavity while performing axial tensile testing on the hose. This solves the technical limitation that conventional strength tests can only simulate a single mechanical load, and constructs a composite force environment coupled with fluid pressure and mechanical tension. This can more realistically reproduce the mechanical behavior of the polyurethane hose during actual medium transportation, ensuring the integrity and accuracy of the test data under real working conditions. That is, while the hose under test is subjected to axial tensile load, its inner wall will be subjected to radial expansion pressure of the fluid medium, thereby completing the strength test of the pipeline under test under the fluid-mechanical multi-field coupling condition under real working conditions, and thus improving the accuracy and authenticity of its test structure.

[0087] In some embodiments, the external medium can be selected from other common media such as pure water, hydraulic oil, or compressed air, depending on the testing requirements. During the actual test, the pressure of the medium injected into the annular sealed chamber can be adjusted in a gradient according to the material strength of the hose under test. Typically, the medium pressure is set slightly higher than the hose's rated operating pressure to simulate a real pressurized service environment. However, to ensure the safety of the testing process, this pressure limit must be strictly limited below the hose's physical burst pressure to avoid media splashing or hardware damage due to instantaneous hose failure.

[0088] In addition, the above-mentioned configuration can further interact with the aforementioned follower ring 323 mechanism. That is, the radial expansion force generated by the injected medium pressure will further compress the hose wall so that it is tightly attached to the clamping tile 332, thereby forming a combined force with the mechanical extrusion force generated therefrom, so as to ensure the stable clamping of the hose to be tested.

[0089] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention 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 or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

[0090] Furthermore, it should be noted that the accompanying drawings in this specification are intended to schematically illustrate the structural principles and connection relationships of the present invention. To more clearly present the internal minute features and their operational logic, the shapes, sizes, or proportions of some structures may be appropriately exaggerated or distorted in the drawings, and are mainly shown using line drawing. Therefore, the drawings are only used to assist in understanding the technical solutions of the present invention and should not be regarded as a strict limitation on the actual product size proportions or specific appearance shape of the present invention. The actual dimensions and proportional relationships of each component should be based on the actual manufacturing process and application requirements. However, the positional relationships, connection methods, and operational coordination logic between the components shown in the drawings are clear and accurate.

Claims

1. A strength testing mechanism for polyurethane hose processing, comprising a base and a testing frame disposed on the base, characterized in that, The testing frame is provided with opposing clamping parts and a testing part for testing the hose to be tested; The clamping part is used to clamp the hose to be tested; The detection unit includes a drive mechanism and a sensing detection unit. The power output end of the drive mechanism is connected to the clamping part and is used to drive the corresponding clamping part to perform axial relative displacement or circumferential rotation. The sensing and detection unit includes conductive terminals and a signal monitoring module. The conductive terminals are connected to an external power supply and are disposed on the clamping part. When the clamping part clamps the hose to be tested, the conductive terminals pass through the wall of the hose to be tested and make conductive contact with the metal reinforcement layer inside it. The signal monitoring module is located on the detection frame and is electrically connected to the conductive terminals and the drive mechanism respectively. When performing strength testing on the hose under test, the drive mechanism drives the clamping part to move relative to each other to apply a test load to the hose under test. The signal monitoring module monitors the electrical signal of the conductive terminal and, based on the sudden change in electrical signal caused by the fracture of the metal reinforcement layer, obtains the drive parameters currently output by the drive mechanism in real time to generate structural strength data of the hose under test.

2. The strength testing mechanism for polyurethane hose processing according to claim 1, characterized in that, The clamping part includes a rotary flange and a support mandrel disposed on the central axis of the rotary flange, and a plurality of clamping members arranged in an array outside the support mandrel. The plurality of clamping members are slidably engaged with the rotary flange, and the clamping ends of the clamping members face the support mandrel.

3. The strength testing mechanism for polyurethane hose processing according to claim 2, characterized in that, The clamping component includes a clamping base and a clamping pad. The bottom clamping surface of the clamping pad is adapted to the outer periphery of the tube wall of the hose to be tested, and the bottom clamping surface of the clamping pad is also provided with a tapered clamping protrusion extending along its length. A hydraulic chamber is provided inside the clamping seat. The hydraulic chamber is connected to the clamping pad through a piston plate. The hydraulic chambers in each clamping seat are connected to each other through a connecting pipe.

4. The strength testing mechanism for polyurethane hose processing according to claim 3, characterized in that, The conductive terminal is disposed on the bottom clamping surface of the clamping tile. The conductive terminal includes an insulating base and a puncture probe. The puncture probe and the insulating base are ball-jointed by a ball joint.

5. The strength testing mechanism for polyurethane hose processing according to claim 4, characterized in that, The ball joint includes a ball socket and a ball head disposed inside the insulating base. The ball head is fixed to the end of the puncture probe and embedded inside the ball socket. A circumferentially distributed reset spring is provided between the ball socket and the ball head. One end of each reset spring is fixed to the inner wall of the ball socket, and the other end elastically abuts against the surface of the ball head. The inner diameter of the opening of the ball socket is larger than the outer diameter of the rod of the puncture probe.

6. The strength testing mechanism for polyurethane hose processing according to claim 3, characterized in that, The slewing flange has a plurality of radially extending grooves on the side that slides with the clamping member. The clamping seat is correspondingly slidably embedded in the grooves, and the side of the clamping seat away from the supporting spindle is connected to a pneumatic pushing mechanism mounted on the surface of the slewing flange.

7. The strength testing mechanism for polyurethane hose processing according to claim 6, characterized in that, An anti-detachment sealing mechanism is provided on the outside of the support mandrel. The anti-detachment sealing mechanism includes a fixed retaining ring and a sealing expansion ring. The fixed retaining ring is fixedly sleeved on the outside of the support mandrel and corresponds to the position of the clamping member. The sealing expansion ring is located on the side of the fixed retaining ring that is relatively close to the free end of the support mandrel. When the hose to be tested is sleeved outside the support mandrel for strength testing, the end of the hose to be tested is clamped and fixed to the clamping member by the fixing retaining ring, and the inner wall of the hose to be tested is in contact with the sealing expansion ring.

8. The strength testing mechanism for polyurethane hose processing according to claim 7, characterized in that, The anti-detachment sealing mechanism also includes a follower ring, which is slidably sleeved on the outside of the support mandrel and near its end position, and its side facing the fixed retaining ring is connected to the sealing expansion ring. The side of the follower ring opposite to the sealing expansion ring is provided with an inclined pressure portion that extends to the outside of the end of the support mandrel. The inclined pressure section is inclined to match the conical transition section formed when the hose under test is subjected to axial tension and contraction. When the follower ring is subjected to the wedge-shaped extrusion force generated by the conical transition section, it slides towards the fixed retaining ring to compress the sealing expansion ring to expand radially outward.

9. A strength testing mechanism for polyurethane hose processing according to claim 7, characterized in that, The outer periphery of the fixed retaining ring is provided with an inner support abutment at the position of the conical clamping protrusion of the clamping tile; When the clamping member clamps the hose to be tested, the inner support abutment member supports the inner wall of the hose to be tested, so as to cooperate with the conical clamping protrusion of the clamping tile on the outside of the hose to be tested.

10. A strength testing mechanism for polyurethane hose processing according to claim 8, characterized in that, One of the supporting mandrels has an axially extending medium filling port at one end, which is connected to an external medium via a pipeline.

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