Thermal expansion sleeve detection device and method

Abstract

This invention belongs to the field of heat shrink tubing testing technology, specifically relating to a heat shrink tubing testing device and method. The device includes a base, on which a heating mold, a translation mechanism, and a clamping mechanism are mounted. The clamping mechanism includes a hybrid simulation sleeve, on which the heat shrink tubing to be tested can be fitted. The hybrid simulation sleeve includes a hollow shaft and an elastic sleeve, with the elastic sleeve fitted onto the hollow shaft. The elastic sleeve has three or more pressure regulating chambers axially arranged. Fillers can be injected into the pressure regulating chambers to adjust the pressure within them. Each pressure regulating chamber is equipped with a corresponding radial pressure sensor. A hollow protrusion is provided between two of the pressure regulating chambers in the hybrid simulation sleeve, and an axial pressure sensor is installed inside the hollow protrusion. The hollow protrusion simulates the irregular contour of cable accessories and serves as a compliance test section with two adjacent pressure regulating chambers, while the remaining pressure regulating chambers serve as a pressure equalization test section. It can simulate various encapsulated materials and simultaneously perform compliance and pressure equalization tests.

Description

Technical Field

[0001] This invention relates to the field of heat shrink tubing testing technology, and specifically to a heat shrink tubing testing device and method. Background Technology

[0002] Heat shrink tubing is widely used in wire and cable joints, electronic component encapsulation, and pipeline corrosion protection. The shrinkage force and adhesion performance of the tubing after heat shrinkage are key indicators of product quality. Insufficient shrinkage force may lead to seal failure, while uneven shrinkage or insufficient conformability to irregular contours (such as cable armor breaks or connector steps) may cause localized gaps or axial slippage. Therefore, accurately detecting the radial shrinkage force distribution of heat shrink tubing and its axial clamping ability to irregular contours is of great significance for product design, process optimization, and quality control.

[0003] Currently, some testing devices have attempted to quantitatively measure the shrinkage force of heat shrink tubing. Existing technology (CN219142079U) describes a device for detecting the shrinkage force of heat shrink tubing, which includes a positioning assembly, a heating assembly, and a data acquisition unit. The positioning assembly includes a first slide assembly and a mandrel. The heat shrink tubing to be tested is fitted onto the outside of the mandrel, and a resistance strain gauge is attached to the inner wall of the heat shrink tubing. The strain gauge is connected to the data acquisition unit. The heating assembly includes a second slide assembly and a heating mold. Through the orthogonal movement of the two slide assemblies, the heat shrink tubing to be tested is fed into the heating cavity of the heating mold. When the heat shrink tubing shrinks due to heat, the strain gauge changes resistance as it bends and deforms. The data acquisition unit calculates the shrinkage force based on this change. This device can obtain the overall shrinkage force value of the heat shrink tubing on the rigid mandrel, achieving a certain degree of quantitative detection of the shrinkage force.

[0004] However, the existing technologies still have the following shortcomings: First, the mandrel is a rigid body with a fixed diameter (steel, copper, aluminum, or plastic), which cannot simulate the different stiffnesses of the covering materials in actual engineering, ranging from soft (such as a semi-conductive layer) to rigid (such as a metal sheath). Furthermore, it cannot be used to set different radial constraint stiffnesses in segments along the axial direction. Therefore, the measured shrinkage force only represents the response of the heat shrink tubing to a specific rigid mandrel and is difficult to generalize to actual application scenarios on substrates with different stiffnesses. Second, strain gauges can only sense the bending strain of the inner wall of the heat shrink tubing, which is ultimately converted into radial shrinkage force. For parts with irregular contours such as cable joints with armor breaks or connector steps, the heat shrink tubing will generate axial compression force due to contour obstruction during axial shrinkage. This axial clamping compliance is directly related to the sealing reliability. Summary of the Invention

[0005] In order to overcome the shortcomings of the prior art, the purpose of this invention is to provide a thermal expansion sleeve testing device that can simulate different covered materials and simultaneously perform compliance testing and pressure equalization testing.

[0006] The technical solution adopted in this invention is as follows: A thermal expansion sleeve testing device includes a base, on which a heating mold, a translation mechanism, and a clamping mechanism are provided. The translation mechanism can drive the heating mold to move, so that the clamping mechanism enters or leaves the heating mold. The clamping mechanism includes a hybrid simulation sleeve, on which the thermal expansion sleeve to be tested can be sleeved. The outer surface of the hybrid simulation sleeve is divided into a compliance test section and a pressure equalization test section. The hybrid simulation sleeve includes a hollow shaft and an elastic sleeve. The elastic sleeve is sleeved on the hollow shaft. The elastic sleeve has three or more pressure regulating chambers axially. The pressure regulating chambers are connected to the pump body pipeline. The pump body can inject filler to adjust the pressure in the pressure regulating chambers. Each pressure regulating chamber is equipped with a corresponding radial pressure sensor. The hybrid simulation sleeve has a hollow protrusion between two of the pressure regulating chambers. An axial pressure sensor is installed inside the hollow protrusion. The hollow protrusion simulates the irregular contour in the cable accessory, and together with the two adjacent voltage regulating cavities, it serves as a compliance test section, while the remaining voltage regulating cavities serve as a voltage equalization test section.

[0007] Working principle: In this invention, the equalizing test section consists of multiple pressure regulating chambers between an elastic sleeve and a hollow shaft. Each pressure regulating chamber is connected to the pump body, and the simulation of encapsulated materials with different stiffnesses is achieved by adjusting the pressure of the filling material in each chamber. The compliance test section has a hollow protrusion between two pressure regulating chambers to simulate the irregular contours in cable accessories.

[0008] During testing, the thermal expansion sleeve is fitted onto the hybrid simulation sleeve and contracts upon heating. In the pressure equalization test section, radial pressure sensors in each pressure regulating chamber detect the radial pressure applied by the contraction of the thermal expansion sleeve. In the compliance test section, the hollow protrusion generates axial compressive force when the thermal expansion sleeve contracts axially, which is detected by the axial pressure sensor.

[0009] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. The outer surface of the hybrid simulation sleeve includes both a compliance test section and a pressure equalization test section, which can obtain radial pressure distribution data and axial compliance data in the same heating test.

[0010] 2. Each pressure regulating chamber can be independently pressure regulated, enabling segmented simulation of the stiffness of the covered object at different axial positions.

[0011] In a preferred embodiment of the present invention, the hollow shaft is provided with an inlet hole, an outlet hole, and a detection hole in each pressure regulating chamber. The inlet hole is connected to an inlet pipe with a first valve, the outlet hole is connected to an outlet pipe with a second valve, and a radial pressure sensor is installed at the end of the detection hole.

[0012] Working principle: Each pressure regulating chamber is injected with liquid through an inlet port and an inlet pipe with a first valve, and discharged or depressurized through an outlet port and an outlet pipe with a second valve. Before testing, the second valve is closed and the first valve is opened. The pump body injects liquid into the pressure regulating chamber through the inlet pipe and inlet port, increasing the internal pressure of the chamber, thus simulating a coated object with a specific stiffness. Once the pressure reaches the target, the first valve is closed to keep the chamber sealed. A radial pressure sensor is connected to the chamber through a detection port to sense changes in pressure within the chamber in real time. When the heat shrink tubing contracts and compresses the elastic sleeve, the chamber pressure increases, and the sensor records this change.

[0013] Beneficial effects: By adjusting the injection pressure of each cavity, the characteristics of different coated materials, from soft to rigid, can be simulated to meet various testing specifications; the detection hole is directly opened on the hollow shaft, the sensor is close to the cavity being tested, the pressure transmission path is short, the response is fast, and the measurement accuracy is high.

[0014] In a preferred embodiment of the present invention, the hollow shaft is provided with a first mounting groove between each two adjacent pressure regulating chambers, and the elastic sleeve is provided with a second mounting groove corresponding to the first mounting groove. The first mounting groove and the second mounting groove form a mounting cavity, and a sealing part is installed in the mounting cavity.

[0015] Beneficial effects: Effectively prevents fluid cross-contamination between chambers and ensures that the radial pressure measurement of each pressure regulating chamber reflects the true contraction force at the corresponding axial position.

[0016] In a preferred embodiment of the present invention, the sealing part corresponding to the hollow protrusion includes a left sealing ring, a right sealing ring, and an L-shaped plate. The left and right sealing rings abut against the two sides of the mounting cavity, respectively. An axial pressure sensor is installed between the left and right sealing rings. The horizontal end of the L-shaped plate abuts against the inner side of the hollow protrusion and is located above the right sealing ring. The vertical end of the L-shaped plate abuts against the detection surface of the axial pressure sensor. There are gaps between the left and right sealing rings and the vertical end of the L-shaped plate.

[0017] Working Principle: The left and right sealing rings abut against the sides of the mounting cavity, preventing liquid leakage from the two adjacent pressure regulating cavities into the hollow protrusion, ensuring independent cavity pressure. When the heat shrink tubing contracts and compresses the hollow protrusion, radial deformation and axial compressive force are generated on the inner side of the hollow protrusion towards the hollow axis. The horizontal end of the L-shaped plate abuts against the inner side of the hollow protrusion, receiving the axial force component; the vertical end transmits the force to the detection surface of the axial pressure sensor, which converts the force into an electrical signal output. A gap is left between the left and right sealing rings and the vertical end of the L-shaped plate, preventing the axial expansion deformation of the sealing rings due to radial pressure from directly pressing against the vertical end of the L-shaped plate, thus minimizing radial force interference to the sensor through the sealing rings. Beneficial effects: An independent rigid force transmission path is constructed by the L-shaped plate, which guides the axial force from the hollow protrusion to the sensor. At the same time, it physically isolates the radial expansion deformation of the sealing ring, effectively avoiding the interference of radial pressure on the axial force measurement.

[0018] This invention also provides a method for detecting thermal expansion sleeves, using the aforementioned thermal expansion sleeve detection device, and includes the following steps: S1: Open the second valve and the first valve, restore the pressure regulating chamber to the initial pressure, close the second valve according to the preset elasticity, use the pump to deliver liquid to the pressure regulating chamber, after the pressure regulating chamber increases to the corresponding pressure, close the first valve, and complete the simulation of the coated object; S2: The thermal expansion sleeve to be tested is placed on the hybrid simulation sleeve. The translation mechanism drives the heating mold to move, so that the thermal expansion sleeve to be tested enters the heating mold and the heating mold heats the thermal expansion sleeve. S3: Based on the changes in the values ​​of the radial pressure sensor and the axial pressure sensor, determine the temperature characteristics, radial uniformity, and axial compliance.

[0019] Working principle: When the pressure value inside the chamber first exceeds the preset value, the temperature corresponding to the earliest moment when the trigger condition is reached among these chambers is taken as the initial shrinkage temperature. When the pressure fluctuation is less than the preset value, the temperature point that first meets the stable condition is taken as the complete shrinkage temperature. The pressure equalization test section contains multiple pressure regulating chambers, each measuring the radial shrinkage pressure independently at different axial positions. Because the surface of the pressure equalization test section is smooth and without hollow protrusions, the heat shrink tubing shrinks naturally in this section, and the pressure value of each chamber can truly reflect the radial shrinkage capacity of the heat shrink tubing at the corresponding position. After heating, the steady-state pressure value of each chamber (i.e., the average pressure after the complete shrinkage temperature) is taken as the basis for analysis. Axial compliance is used to evaluate the ability of a heat shrink tubing to "hug" an irregular contour (such as a step or armor break in a cable joint) when it encounters such a contour in a free shrinking state. The hollow protrusion in the compliance test section simulates an irregular contour. The heat shrink tubing is heated and shrunk when both ends are free. The axial shrinkage tendency is hindered by the hollow protrusion, generating a unilateral axial compressive force on the hollow protrusion. The compliance can be judged by detecting this value. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of an embodiment of the thermal expansion sleeve detection device of the present invention; Figure 2 This is a three-dimensional sectional view of the heating mold and clamping mechanism in an embodiment of the thermal expansion sleeve testing device of the present invention; Figure 3 This is the present invention. Figure 2 Enlarged view of the structure at point A.

[0021] The reference numerals in the attached drawings include: base 1, heating mold 2, translation mechanism 3, electric push rod 31, connecting seat 32, clamping mechanism 4, hollow shaft 5, liquid inlet hole 51, liquid outlet hole 52, detection hole 53, radial pressure sensor 54, elastic sleeve 6, pressure regulating chamber 61, hollow protrusion 62, O-ring seal 7, axial pressure sensor 81, left sealing ring 82, right sealing ring 83, and L-shaped plate 84. Detailed Implementation

[0022] Typical embodiments embodying the features and advantages of the present invention will be specifically described in the following description. It should be understood that the present invention can have various variations in different embodiments without departing from the scope of the present invention, and the descriptions and illustrations herein are for illustrative purposes only and not intended to limit the present invention.

[0023] In the description of this application, the terms "first", "second", etc. are used only for the convenience of describing this application and simplifying the description, and are not intended to indicate or imply that the structure referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0024] Example 1 See Figure 1 As shown, this embodiment discloses a thermal expansion sleeve testing device. The device includes a base 1, on which a heating mold 2, a translation mechanism 3, and a clamping mechanism 4 are mounted. The translation mechanism 3 uses an electric push rod 31 (in other embodiments, a hydraulic cylinder or pneumatic cylinder can also be used). The moving end of the electric push rod 31 is fixedly mounted with a connecting seat 32, and the electric push rod can drive the connecting seat 32 to slide on the upper surface of the base 1. The heating mold 2 is fixedly mounted on the connecting seat 32 and can be driven to move horizontally. The clamping mechanism 4 smoothly enters or disengages. The heating mold 2 is a heating cavity with an internal temperature-controlled thermocouple, which can heat the sample according to a preset temperature curve (e.g., from room temperature to 200°C at a rate of 5°C / min).

[0025] In this embodiment, The core component of the clamping mechanism 4 includes a hybrid simulation sleeve. The hybrid simulation sleeve consists of a hollow shaft 5 and an elastic sleeve 6. The elastic sleeve 6 is made of high-temperature resistant silicone rubber or fluororubber and is tightly fitted around the outer periphery of the hollow shaft 5.

[0026] Among them, see Figure 2 As shown, the elastic sleeve 6 has three pressure regulating chambers 61 along its axis (in other embodiments, four or five chambers can be provided to increase the pressure equalization test section. For test scenarios that need to simulate the axially variable stiffness of the covered object, different target pressures can be set for each chamber).

[0027] Taking one of the pressure regulating chambers 61 as an example, the hollow shaft 5 has an inlet hole 51, an outlet hole 52, and a detection hole 53 corresponding to the position of the pressure regulating chamber 61. The inlet hole 51 is connected to an inlet pipe 7 with a first valve via a pipeline, and the inlet pipe is connected to a high-precision metering pump. The outlet hole 52 is connected to an outlet pipe with a second valve via a pipeline, and the outlet pipe is connected to a return tank. The detection hole 53 is a radial through hole, and a radial pressure sensor 54 is installed at its end. The sensing surface of the radial pressure sensor 54 is in direct contact with the liquid in the chamber. Both the first valve and the second valve are solenoid valves.

[0028] The hollow shaft 5 has a circumferential first mounting groove on its outer wall between two adjacent pressure regulating chambers 61; the elastic sleeve has a second mounting groove at a corresponding position on its inner wall. The first and second mounting grooves fit together to form a rectangular mounting cavity. A sealing part is installed inside the mounting cavity. In the cavity without hollow protrusions, the sealing part is a single O-ring seal 7, used to prevent liquid cross-contamination between adjacent pressure regulating chambers 61.

[0029] Among them, see Figure 3 As shown, between one set of adjacent pressure regulating chambers 61, a hollow protrusion 62 is integrally formed on the outer surface of the elastic sleeve 6. The hollow protrusion 62 is annular, simulating irregular contours such as armor break and connector steps in cable accessories.

[0030] A special sealing part is provided in the mounting cavity corresponding to the hollow protrusion 62. The sealing part includes a left sealing ring 82, a right sealing ring 83, and an L-shaped plate 84.

[0031] The left sealing ring 82 rests against the left side wall of the mounting cavity, and the right sealing ring 83 rests against the right side wall of the mounting cavity. Both sealing rings are high-temperature resistant fluororubber O-rings, which, while achieving intercavity sealing, leave a section of installation space between their axial inner sides.

[0032] An axial pressure sensor 81 is installed within this installation space. This sensor is a strain gauge force sensor, fixedly mounted on the outer wall of the hollow shaft 5, with its detection surface facing the right.

[0033] The L-shaped plate 84 is made of stainless steel and has sufficient rigidity. The top of the L-shaped plate 84 rests against the inner wall of the hollow protrusion 62, and the horizontal end of the L-shaped plate 84 is located above the right sealing ring 83. The vertical end of the L-shaped plate 84 rests against the detection surface of the axial pressure sensor 81.

[0034] A gap is left between the left sealing ring 82 and the vertical end of the L-shaped plate 84; a gap is also left between the right sealing ring 83 and the vertical end of the L-shaped plate 84. This gap ensures that the sealing rings will not push against the vertical end of the L-shaped plate 84 when they expand under radial pressure, thus avoiding interference from radial pressure.

[0035] In this embodiment, the axial pressure sensor 81 is a strain gauge force sensor, which has an initial output value when no external force is applied. Before each test, with the thermal expansion sleeve not installed and each pressure regulating chamber at its initial atmospheric pressure, the control system reads the initial output value of the axial pressure sensor 81 and sets it to zero (software zeroing). The pressure value recorded during the test is the change relative to this initial zero point, thereby eliminating the influence of sensor preload and zero-point drift on the measurement results. After each test, the device is allowed to cool to room temperature before zero-point calibration is performed to ensure the accuracy of the next test.

[0036] Based on the above structure, the outer surface of the hybrid simulation sleeve is naturally divided into a compliance test section and a pressure equalization test section.

[0037] This embodiment also provides a method for detecting thermal expansion sleeves, using the thermal expansion sleeve detection device described above, including the following steps: Step S1: Simulation of the coating Open the first and second valves of all pressure regulating chambers 61 to connect each chamber to the return tank, allowing the liquid in the chamber to flow back and return to the initial state of normal pressure.

[0038] According to the pre-set stiffness requirements of the coated material for this test (e.g., simulating medium stiffness of cable insulation and setting the cavity pressure to 0.3 MPa), the second valve of each cavity is closed. The metering pump is started, and hydraulic oil is injected into each pressure regulating cavity 61 through the inlet pipe and inlet hole 51. During the injection process, the readings of the radial pressure sensor 54 of each cavity are monitored in real time. When the pressure of a cavity reaches the target value of 0.3 MPa, the first valve corresponding to that cavity is closed. After all cavities are pressurized, each pressure regulating cavity 61 becomes an independent closed hydraulic cavity, completing the coated material simulation.

[0039] Step S2: Sample mounting and heating The thermal expansion sleeve to be tested is placed on the outer surface of the hybrid simulation sleeve, with no fixed constraints applied to either end of the sleeve, allowing it to be in a free state. The thermal expansion sleeve must completely cover all pressure regulating chambers 61 and the hollow protrusions 62.

[0040] The translation mechanism 3 is activated, which moves the heating mold 2. The clamping mechanism 4, together with the mixed simulation sleeve fitted with the sample, smoothly enters the heating chamber and closes the mold.

[0041] The heating mold 2 is started and heated according to the preset temperature program, for example, starting from 25°C and heating up to 180°C at a rate of 5°C / min, and then holding at 180°C for 10 minutes. During the heating process, the control system synchronously records the output data of all three radial pressure sensors 54 and axial pressure sensors 81 at a sampling frequency of no less than 1 time / second, and also records the real-time temperature of the heating mold 2.

[0042] Step S3: Multi-parameter analysis and judgment After the heating and heat preservation process is completed, the control system automatically performs the following three judgments based on the collected data: (a) Determination of temperature characteristics The pressure trigger threshold is set to 0.02 MPa. When the pressure value of any pressure regulating chamber 61 exceeds the initial pressure value of 0.02 MPa for the first time, the corresponding temperature is recorded as the initial contraction temperature. The pressure stabilization condition is set to the standard deviation of the pressure value of 10 consecutive samples being ≤0.01 MPa. When this condition is met, the corresponding temperature is recorded as the complete contraction temperature.

[0043] (ii) Radial uniformity determination Take the average pressure of each pressure regulating chamber 61 in the pressure equalization test section after the full contraction temperature, calculate the maximum deviation between the pressure values ​​of each chamber, and if the maximum deviation does not exceed ±15% of the average pressure value of each chamber, the radial uniformity is deemed qualified.

[0044] (III) Axial compliance determination The force output by the axial pressure sensor 81 begins to increase at approximately 80°C and stabilizes around 150°C. During the test, there were no sudden drops or abnormal fluctuations in the axial force during the increase, and the unilateral axial compressive force matched the statistical mean of qualified products in the same batch, indicating that the sample's axial compliance was qualified. The statistical mean of qualified products in the same batch was determined as follows: at least 10 confirmed qualified heat-shrinkable sleeve samples from the same batch were taken and tested using this device under the same test conditions. Their steady-state axial pressure values ​​(the average pressure after full shrinkage temperature) were recorded, and the arithmetic mean μ and standard deviation σ were calculated. If the steady-state axial pressure value of the tested sample falls within the range of μ ± 3σ, it is determined to match the statistical mean of qualified products in the same batch, and the axial compliance is qualified; otherwise, the axial compliance is determined to be unqualified.

[0045] After the test is completed, stop heating and wait for the mold to cool to below 60°C. Then, the translation mechanism 3 will move the clamping mechanism 4 out. Open all the second valves to release the pressure and remove the shrunken heat shrink tubing sample (this sample is usually permanently molded and cannot be reused). Check the condition of the elastic sleeve and hollow protrusions, clean any surface residue, and prepare for the next test cycle.

[0046] It should be understood that the preset pressure threshold and stability conditions in the temperature characteristic determination, the allowable deviation range in the radial uniformity determination, and the statistical determination rules in the axial compliance determination are all exemplary specific implementation methods. Those skilled in the art can set the corresponding thresholds and determination rules according to actual test requirements and product standards.

[0047] The above embodiments are merely preferred embodiments of the present invention and should not be construed as limiting the scope of protection of the present invention. Any non-substantial changes and substitutions made by those skilled in the art based on the present invention shall fall within the scope of protection claimed by the present invention.

Claims

1. A thermal expansion sleeve testing device, comprising a base, wherein a heating mold, a translation mechanism, and a clamping mechanism are provided on the base, the translation mechanism being capable of driving the heating mold to move, thereby causing the clamping mechanism to enter or disengage from the heating mold, characterized in that: The clamping mechanism includes a hybrid simulation sleeve, on which the thermal expansion sleeve to be tested can be sleeved. The outer surface of the hybrid simulation sleeve is divided into a compliance test section and a pressure equalization test section. The hybrid simulation sleeve includes a hollow shaft and an elastic sleeve. The elastic sleeve is sleeved on the hollow shaft. The elastic sleeve has three or more pressure regulating chambers axially. The pressure regulating chambers are connected to the pump body pipeline. The pump body can inject filler to adjust the pressure in the pressure regulating chambers. Each pressure regulating chamber is equipped with a corresponding radial pressure sensor. The hybrid simulation sleeve has a hollow protrusion between two of the pressure regulating chambers. An axial pressure sensor is installed inside the hollow protrusion. The hollow shaft has an inlet hole, an outlet hole, and a detection hole in each pressure regulating chamber. The inlet hole is connected to an inlet pipe with a first valve, and the outlet hole is connected to an outlet pipe with a second valve. A radial pressure sensor is installed at the end of the detection hole. The hollow protrusion simulates the irregular contour in the cable accessory, and together with the two adjacent voltage regulating cavities, it serves as a compliance test section, while the remaining voltage regulating cavities serve as a voltage equalization test section.

2. The thermal expansion sleeve detection device according to claim 1, characterized in that: The hollow shaft has a first mounting groove between each pair of adjacent pressure regulating chambers, and the elastic sleeve has a second mounting groove that corresponds to the first mounting groove. The first mounting groove and the second mounting groove form a mounting cavity, and a sealing part is installed in the mounting cavity.

3. The thermal expansion sleeve detection device according to claim 2, characterized in that: The sealing part corresponding to the hollow protrusion includes a left sealing ring, a right sealing ring, and an L-shaped plate. The left and right sealing rings abut against the two sides of the mounting cavity, respectively. The axial pressure sensor is installed between the left and right sealing rings. The horizontal end of the L-shaped plate abuts against the inner side of the hollow protrusion and is located above the right sealing ring. The vertical end of the L-shaped plate abuts against the detection surface of the axial pressure sensor. There are gaps between the left and right sealing rings and the vertical end of the L-shaped plate.

4. A method for detecting thermal expansion sleeves, using the thermal expansion sleeve detection device as described in any one of claims 1-3, characterized in that, Includes the following steps: S1: Open the second valve and the first valve, restore the pressure regulating chamber to the initial pressure, close the second valve according to the preset elasticity, use the pump to deliver liquid to the pressure regulating chamber, after the pressure regulating chamber increases to the corresponding pressure, close the first valve, and complete the simulation of the coated object; S2: The thermal expansion sleeve to be tested is placed on the hybrid simulation sleeve. The translation mechanism drives the heating mold to move, so that the thermal expansion sleeve to be tested enters the heating mold and the heating mold heats the thermal expansion sleeve. S3: Based on the changes in the values ​​of the radial pressure sensor and the axial pressure sensor, determine the temperature characteristics, radial uniformity, and axial compliance.

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