A test device and control method for metal sheath expansion

Abstract

The present invention relates to a test device for expanding a metal sheath, comprising a frame, a guide mechanism, a lifting plate, a first test cone, a first clamping mechanism and a first distance measuring sensor, wherein the frame comprises a first plate, the guide mechanism comprises a guide shaft and a guide sleeve, the guide shaft is arranged on the frame, and the guide sleeve is movably sleeved on the outside of the guide shaft, the guide sleeve is configured to move along the axial direction of the guide shaft, and the lifting plate moves in a controlled manner. The test device, by adopting the technical means of the guide mechanism, the first clamping mechanism and the first distance measuring sensor, can ensure that the metal sheath maintains coaxiality with the first test cone during the expansion test, and realizes real-time measurement of the expansion diameter through a laser beam, effectively solving the problems of inaccurate positioning, large measurement errors and long test time in the prior art, thereby achieving the technical effects of improving test accuracy, improving expansion consistency and shortening test time.

Description

Technical Field

[0001] The invention relates to a sheath expansion test device, in particular to a test device used for metal sheath expansion. Background Art

[0002] In the field of railway signal cable production, in order to meet the needs of water blocking, shielding and mechanical protection, the cable core is usually covered with a metal sheath. This metal sheath structure can significantly enhance the durability and safety of the cable, and is widely used in railway signal systems in outdoor and special environments. At present, the manufacturing method of the metal sheath includes welding the metal strip into a tubular sheath to cover the cable core, or inserting the cable core into a pre-formed metal tube, and then completing the forming of the metal sheath through a rolling process. The sheath must not only have excellent mechanical properties, but also meet strict quality inspection standards to ensure its reliability in practical applications.

[0003] Existing metal sheaths are usually expanded by manual jacks. During the test, a 30° or 60° cone is used to expand the diameter of the metal sheath. The expanded metal diameter is required to be expanded to 1.3 times the original diameter to test its mechanical properties under stress conditions.

[0004] However, during the expansion test, due to the limitation of the measurement method and force control of the manual jack, the operator needs to repeatedly measure the expanded pipe diameter to ensure that the outer diameter after expansion reaches the set standard. This operation is not only time-consuming and inefficient, but also has a large measurement error, which affects the reliability of the test results and is difficult to meet the requirements of industrial detection for efficiency and accuracy. Therefore, it is urgent to propose a test device for metal sheath expansion to solve the above problems. Summary of the invention

[0005] The object of the present invention is to provide a test device for metal sheath expansion, which can ensure that the expanded diameter of the metal sheath reaches a predetermined standard during the expansion test and reduce the measurement error caused by human intervention, thereby improving the test efficiency and the reliability of the results.

[0006] The technical solution adopted by the present invention to solve the above problem is: a test device for metal sheath expansion, comprising:

[0007] The frame includes a first plate.

[0008] The guide mechanism comprises a guide shaft and a guide sleeve, wherein the guide shaft is arranged on the frame, and the guide sleeve is movably sleeved on the outside of the guide shaft, and the guide sleeve is configured to move along the axial direction of the guide shaft.

[0009] A lifting plate, with controlled movement, is connected to the guide sleeve so that the lifting plate is restricted to move axially along the guide shaft.

[0010] The first test cone is arranged on the side of the first plate member facing the lifting plate, and the axis of the first test cone is parallel to the moving direction of the lifting plate.

[0011] The first clamping mechanism is arranged on the side of the lifting plate facing the first test cone, and the first clamping mechanism is configured to make the axis of the metal sheath collinear with the axis of the first test cone when the metal sheath is clamped by the first clamping mechanism.

[0012] A first distance measuring sensor is connected to the frame in a relatively fixed manner, and the first distance measuring sensor includes:

[0013] A first emitting unit, wherein the first emitting unit emits a laser beam, wherein the direction of the laser beam emitted by the first emitting unit is configured to be parallel to the side surface of the first test cone, and a preset gap is left between the laser beam emitted by the first emitting unit and the side surface of the first test cone.

[0014] A first receiving unit, wherein the first receiving unit receives the reflected laser beam;

[0015] A controller is connected to the lifting plate and the first ranging sensor to control the movement of the lifting plate through feedback data from the first ranging sensor, and the controller is configured to stop the movement of the lifting plate when a real-time expansion multiple of the metal sheath clamped by the first clamping mechanism toward one end of the lifting plate is equal to a preset target multiple.

[0016] Preferably, the frame further comprises:

[0017] The second plate is arranged in parallel with the first plate, and the second plate is arranged on a side of the lifting plate away from the first plate, so that the lifting plate is restricted to move between the first plate and the second plate.

[0018] The test device also includes:

[0019] A second test cone is arranged on a side of the lifting plate away from the first clamping mechanism.

[0020] The second clamping mechanism is arranged on a side of the second plate member facing the lifting plate, and the second clamping mechanism is configured so that when the metal sheath is clamped by the second clamping mechanism, the axis of the metal sheath is collinear with the axis of the second test cone.

[0021] The second distance measuring sensor is connected to the frame in a relatively fixed manner, and includes:

[0022] A second emitting unit, wherein the second emitting unit emits a laser beam, wherein the direction of the laser beam emitted by the second emitting unit is configured to be parallel to the side surface of the second test cone, and a preset gap is left between the laser beam emitted by the second emitting unit and the side surface of the second test cone.

[0023] A second receiving unit receives the reflected laser beam.

[0024] Preferably, the frame further comprises:

[0025] The second plate is arranged in parallel with the first plate, and the second plate is arranged on a side of the lifting plate away from the first plate, so that the lifting plate is restricted to move between the first plate and the second plate.

[0026] The test device also includes:

[0027] A second test cone is arranged on a side of the second plate member facing the lifting plate.

[0028] The second clamping mechanism is arranged on a side of the lifting plate away from the first clamping mechanism, and the second clamping mechanism is configured so that when the metal sheath is clamped by the second clamping mechanism, the axis of the metal sheath is collinear with the axis of the second test cone.

[0029] The second distance measuring sensor is connected to the frame in a relatively fixed manner, and includes:

[0030] A second emitting part, wherein the second emitting part emits a laser beam, wherein the direction of the laser beam emitted by the second emitting part is configured to be parallel to the side surface of the second test cone, and a gap is left between the laser beam emitted by the second emitting part and the side surface of the second test cone.

[0031] A second receiving unit receives the reflected laser beam.

[0032] Preferably, the test device further comprises a driving mechanism, and the driving mechanism comprises:

[0033] The drive motor includes an output shaft for controlled rotation.

[0034] A ball screw, the lifting plate is transmission-connected to the driving motor via the ball screw.

[0035] Preferably, the test device further comprises:

[0036] The oil guide seat is connected to the lifting plate. An oil guide groove is provided on the oil guide seat. The oil guide groove is aligned with the first clamping mechanism to receive the lubricating liquid dripping from the metal sheath.

[0037] An oil guide pipe is arranged on the oil guide seat, and the oil guide pipe is communicated with the oil guide groove.

[0038] An oil storage box is arranged on the lifting plate, and the oil storage box is communicated with the oil outlet of the oil guide pipe.

[0039] Preferably, the test device further comprises:

[0040] The first pressure sensor is arranged on the lifting plate, and the first pressure sensor is located between the first clamping mechanism and the lifting plate to detect the pressure value borne by the metal sheath when the side surface of the first test cone abuts against the port of the metal sheath clamped by the first clamping mechanism.

[0041] The second pressure sensor is arranged between the second clamping mechanism and the second plate to detect the pressure value borne by the metal sheath when the side surface of the second test cone abuts against the end of the metal sheath clamped by the second clamping mechanism.

[0042] Preferably, the test device further comprises:

[0043] The first pressure sensor is arranged on the lifting plate, and the first pressure sensor is located between the first clamping mechanism and the lifting plate to detect the pressure value borne by the metal sheath when the side surface of the first test cone abuts against the port of the metal sheath clamped by the first clamping mechanism.

[0044] The second pressure sensor is arranged between the second clamping mechanism and the lifting plate to detect the pressure value borne by the metal sheath when the side surface of the second test cone abuts against the end of the metal sheath clamped by the second clamping mechanism.

[0045] Preferably, the lifting plate comprises a through slot, and an extending direction of the through slot is parallel to the axial direction of the guide shaft.

[0046] The test device also includes:

[0047] Limiting mechanism, including:

[0048] A limiting shaft is connected to the frame, and the axis of the limiting shaft is parallel to the axis of the guide shaft. The limiting shaft is inserted in the through groove.

[0049] A first limit member and a second limit member, wherein the first limit member and the second limit member are both arranged outside the limit axis, and the distance between the two is defined as a preset spacing, and the lifting plate is located between the first limit member and the second limit member so that the movement range of the lifting plate is within the preset spacing.

[0050] Among them, the side surface of the first test cone abuts against the port of the metal sheath clamped by the first clamping mechanism until the diameter at the port of the metal sheath expands to any value between 1.30 and 1.35 times the original diameter, and the moving distance of the lifting plate is less than half of the preset spacing.

[0051] Preferably, the control method comprises:

[0052] The initial position parameters of the first test cone and the geometric parameters of the first test cone are detected.

[0053] The target distance is determined according to the initial position parameter and the diameter of the metal sheath clamped by the first clamping mechanism and facing the lifting plate.

[0054] The lifting plate is controlled to move the target distance in a direction close to the first test cone, so that the metal sheath clamped by the first clamping mechanism is aligned with the side surface of the first test cone toward one end of the lifting plate.

[0055] The lifting plate is controlled to move toward the direction close to the first test cone, and the real-time position parameters of one end of the metal sheath clamped by the first clamping mechanism toward the lifting plate are detected in real time.

[0056] The real-time expansion multiple of the metal sheath clamped by the first clamping mechanism when it moves toward one end of the lifting plate is determined according to the real-time position parameter and the geometric parameters of the first test cone, and the lifting plate stops moving when the real-time expansion multiple is equal to the preset target multiple.

[0057] Preferably, the real-time expansion multiple when the metal sheath clamped by the first clamping mechanism moves toward one end of the lifting plate is determined according to the real-time position parameter and the geometric parameter of the first test cone, and the lifting plate is stopped from moving when the real-time expansion multiple is equal to a preset target multiple. The real-time expansion multiple in this step can be obtained by the following method:

[0058] According to the difference between the initial position parameters and the real-time position parameters and the taper of the first test cone, the real-time expansion value of the inner diameter of the metal sheath clamped by the first clamping mechanism toward one end of the lifting plate can be calculated by trigonometric function, and the real-time expansion multiple can be obtained according to the ratio of the real-time expansion value to the inner diameter of the metal sheath clamped by the first clamping mechanism before expansion toward one end of the lifting plate.

[0059] Beneficial effects of various embodiments of the present invention:

[0060] The test device, by adopting the technical means of the guiding mechanism, the first clamping mechanism and the first ranging sensor, can ensure that the metal sheath maintains coaxiality with the first test cone during the expansion test, and realizes real-time measurement of the expansion diameter through the laser beam, effectively solving the problems of inaccurate positioning, large measurement errors and long test time in the prior art, thereby achieving the technical effects of improving test accuracy, enhancing expansion consistency and shortening test time.

[0061] The control method of the test device adopts technical means to detect the initial position parameters of the first test cone, determine the target distance according to the initial position parameters, control the lifting plate to move toward the target distance, detect the real-time position parameters of the metal sheath in real time, and control the lifting plate to stop moving based on the real-time expansion multiple. Therefore, it can accurately control the position and expansion multiple of the metal sheath during the expansion process, effectively solving the problems of inaccurate measurement of the expansion process and difficulty in real-time control of the expansion multiple in the prior art, thereby achieving the technical effect of improving the expansion test accuracy, shortening the operation time, and ensuring the consistency of the expansion results. BRIEF DESCRIPTION OF THE DRAWINGS

[0062] Figure 1 1 is a schematic front view of a test device in one embodiment of the present invention.

[0063] Figure 2 is a schematic side view of a test device in one embodiment of the present invention.

[0064] Figure 3 It is a flowchart of a control method of a test device in one embodiment of the present invention.

[0065] Among them: 100, test device; 110, frame; 111, first plate; 112, second plate; 120, guide mechanism; 121, guide shaft; 122, guide sleeve; 130, lifting plate; 140, first test cone; 150, first clamping mechanism; 160, first distance measuring sensor; 170, second test cone; 180, second clamping mechanism; 190, limit mechanism; 191, limit shaft; 192, first limit member; 193, second limit member; 1100, drive mechanism; 1101, drive motor; 1102, ball screw; 1110, oil guide seat; 1120, oil guide pipe; 1130, oil storage box. DETAILED DESCRIPTION

[0066] The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0067] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the scope of protection of the present application. In addition, the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description created by the present application, unless otherwise specified, "multiple" means two or more.

[0068] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood by specific circumstances.

[0069] like Figure 1-Figure 2 As shown, a preferred embodiment of the present application provides a test device 100 for performing a flaring test on a target object, which may be an aluminum sheath or an iron sheath, and is not specifically limited here and is determined based on actual conditions, but the shape of the target object needs to be approximately tubular.

[0070] In order to expand the port of the sheath, it is necessary to control the tip of a first test cone 140 having a diameter larger than the diameter of the end of the sheath to be expanded to move toward the direction close to the sheath, and during the movement of the first test cone 140, the axis of the first test cone 140 needs to be colinear with the axis of the end of the sheath to be expanded to ensure that the end surface edge of the sheath with the expanded end is uniformly stressed when contacting the side of the first test cone 140. Therefore, in this embodiment, the test device 100 includes a frame 110, a guide mechanism 120, a lifting plate 130, a first test cone 140, and a guide mechanism 120. 0, a first clamping mechanism 150 and a first distance measuring sensor 160, wherein the frame 110 includes a first plate 111; the guide mechanism 120 includes a guide shaft 121 and a guide sleeve 122, wherein the guide shaft 121 is arranged on the frame 110, and the guide sleeve 122 is movably sleeved on the outside of the guide shaft 121, and the guide sleeve 122 is configured to move along the axial direction of the guide shaft 121; the lifting plate 130 is controlled to move, and the lifting plate 130 is connected to the guide sleeve 122 so that the lifting plate 130 is restricted to move along the guide shaft Axial movement of the shaft 121; the first test cone 140 is arranged on the side of the first plate 111 facing the lifting plate 130, and the axis of the first test cone 140 is parallel to the moving direction of the lifting plate 130; the first clamping mechanism 150 is arranged on the side of the lifting plate 130 facing the first test cone 140, and the first clamping mechanism 150 is configured so that when the metal sheath is clamped by the first clamping mechanism 150, the axis of the metal sheath is collinear with the axis of the first test cone 140; the first distance measuring sensor 160 is connected to the frame 110 in a relatively fixed manner, and the first distance measuring sensor 160 includes a first transmitting part (not shown in the figure) and a first receiving part (not shown in the figure), the first transmitting part emits a laser beam, the direction of the laser beam emitted by the first transmitting part is configured to be parallel to the side of the first test cone 140, and a preset gap is left between the laser beam emitted by the first transmitting part and the side of the first test cone 140, and the first receiving part receives the laser beam after reflection.

[0071] In the prior art, due to the limitation of the measurement method and force control of the manual jack, the operator needs to repeatedly measure the expanded pipe diameter to ensure that the outer diameter after expansion reaches the set standard. However, although it is relatively simple to measure the size of the expanded diameter, this measurement method is not accurate because the metal sheath has obvious irregular contraction under pressure, and there is no regularity to follow for this contraction. Secondly, if the diameter of the expanded end of the sheath is measured directly, it is difficult to find the measurement point accurately because the expanded end of the sheath changes with the movement of the first test cone 140, and measurement errors are prone to occur, affecting the reliability of the test results.

[0072] Different from the prior art, the first ranging sensor 160 in the present application can calculate the expansion value of the sheath expansion end in real time by real-time monitoring the movement distance of the sheath expansion end along the first test cone 140 during the measurement process, so as to control the first test cone 140 to stop moving after the expansion value of the sheath expansion end increases to the target value, so as to improve the test efficiency while ensuring the accuracy of the test results.

[0073] Specifically, according to the taper of the first test cone 140 and the distance that the expansion end of the sheath moves along the inclined surface of the first test cone 140, the expansion value of the expansion end of the sheath can be calculated in real time by trigonometric functions, and according to the ratio of the expansion value to the initial value of the expansion end of the sheath, it can be determined whether the expansion end of the sheath has expanded to a preset target multiple.

[0074] Among them, Figure 1 As shown, the first plate 111 is embodied as a rectangular plate in a specific manner, the number of guide shafts 121 is usually two, one end of each of the two guide shafts 121 is fixedly connected to the first plate 111, and the two guide shafts 121 are symmetrically arranged with the center line of the first plate 111 as the symmetry axis, the lifting plate 130 is also embodied as a rectangular plate in a specific manner, the sides of the lifting plate 130 and the first plate 111 facing each other are parallel to each other, and are both perpendicular to the axis of the guide shaft 121, the number of guide sleeves 122 is also two, both are fixedly mounted on the lifting plate 130, and the two guide sleeves 122 are respectively movably sleeved on the outside of the two guide shafts 121, so that the lifting plate 130 can only move along the axial direction of the guide shaft 121. The first test cone 140 is fixedly mounted at the center of the first plate 111 facing the lifting plate 130, the cone tip of the first test cone 140 is arranged toward the lifting plate 130, and the axis of the first test cone 140 is perpendicular to its mounting plane. The first clamping mechanism 150 is fixedly mounted on the side of the lifting plate 130 facing the first plate 111. The first clamping mechanism 150 is specifically embodied as a three-jaw chuck, and the center of the three-jaw chuck passes through the axis of the first test cone 140. Figure 2 As shown, the first distance measuring sensor 160 can be fixedly mounted on the frame 110 or fixed on an external bracket, and the posture of the first distance measuring sensor 160 is configured so that the laser beam emitted by the first emitting part is parallel to the inclined surface of the first test cone 140, and there is a preset gap between the laser beam and the inclined surface of the first test cone 140. The preset gap is the distance between the outer edge of the laser beam and the surface of the first test cone 140, and the preset gap can generally take any value from 0.5 mm to 1 mm.

[0075] In this embodiment, by using the guiding mechanism 120, the first clamping mechanism 150 and the first distance measuring sensor 160 in cooperation, it can ensure that the sheath remains coaxial with the first test cone 140 during the expansion test, while achieving real-time measurement of the expansion diameter of the sheath, effectively solving the problems of inaccurate positioning, large measurement errors and long test time in the prior art, thereby achieving the technical effects of improving test accuracy, enhancing expansion consistency and shortening test time.

[0076] Among them, the first distance measuring sensor can be a laser sensor, and the controller described later can be a PLC. The PLC transmits the measured value to the PLC through Modbus communication for calculation. This overcomes the inaccurate measurement caused by the deformation of the aluminum tube after being compressed in Solution 1. In terms of electrical control, Kunlun Tongtai touch screen and Siemens PLC are selected for joint control. The servo motor driving the lead screw adopts Huichuan SV660FS5R5I servo controller, which has Profinet communication function. PLC controls the servo control through Profinet. The drive motor adopts Huichuan MS1H4-75B30CB-A331R AC servo motor, which has a 23-bit incremental encoder, which provides real-time feedback to the servo controller to provide precise control for the operation of the lead screw. The AC servo control system is selected mainly because the servo motor has good characteristics at low speeds. In order to meet the requirements of the national standard metal tube expansion test method GB / T242-2007 / ISO8493:19986.2, the axis of the conical top core should be consistent with the axis of the specimen during expansion, and the equipment needs to be designed with an automatic centering device for the sheath (aluminum tube).

[0077] In order to improve the test efficiency and the accuracy of the test results, a control method for the above test device 100 is proposed in one embodiment, such as Figure 3 As shown, the test device 100 further includes a controller (not shown in the figure), and a first reflector (not shown in the figure) is installed at the tip of the first test cone 140 to provide a reflective surface for the tip of the first test cone 140. The control method includes:

[0078] The initial position parameters of the first test cone 140 and the geometric parameters of the first test cone 140 are detected.

[0079] The target distance is determined according to the initial position parameter and the diameter of the metal sheath clamped by the first clamping mechanism 150 and the end thereof facing the lifting plate 130 .

[0080] The lifting plate 130 is controlled to move the target distance toward the first test cone 140 , so that the metal sheath clamped by the first clamping mechanism 150 is aligned with the side surface of the first test cone 140 toward one end of the lifting plate 130 .

[0081] The lifting plate 130 is controlled to move toward the direction close to the first test cone 140 , and the real-time position parameters of one end of the metal sheath clamped by the first clamping mechanism 150 toward the lifting plate 130 are detected in real time.

[0082] The real-time expansion multiple of the metal sheath clamped by the first clamping mechanism 150 when moving toward one end of the lifting plate 130 is determined according to the real-time position parameters and the geometric parameters of the first test cone 140, and the lifting plate 130 stops moving when the real-time expansion multiple is equal to the preset target multiple.

[0083] The initial position parameters of the first test cone 140 and the geometric parameters of the first test cone 140 are detected, specifically:

[0084] The first emitting part of the first ranging sensor 160 is controlled to emit a laser beam, so that the laser beam is reflected by the first reflecting part and received by the first receiving part, thereby measuring the distance between the tip of the first test cone 140 and the first ranging sensor 160, which is the initial position parameter.

[0085] The taper and axial length of the first test cone 140 are obtained by measuring with a measuring tool or by calibration values ​​obtained by the manufacturer.

[0086] The target distance is determined according to the initial position parameter and the diameter of the metal sheath clamped by the first clamping mechanism 150 and facing the lifting plate 130, specifically:

[0087] The diameter of the end of the metal sheath clamped by the first clamping mechanism 150 that faces the lifting plate 130 is the inner diameter of the expanded end of the metal sheath before expansion, and the inner diameter can be obtained through a measuring tool or a calibrated value of the manufacturer.

[0088] According to the inner diameter of the expanded end of the metal sheath before expansion and the taper of the first test cone 140, the distance that the cone tip of the first test cone 140 is inserted into the sheath when one end of the metal sheath clamped by the first clamping mechanism 150 is in contact with the side of the first test cone 140 toward the lifting plate 130 can be calculated by trigonometric functions. Furthermore, according to the distance that the cone tip of the first test cone 140 is inserted into the sheath and the taper of the first test cone 140, the moving distance of the expanded end of the sheath relative to the side of the first test cone 140 can be calculated by trigonometric functions. This moving distance is the target distance.

[0089] The lifting plate 130 is controlled to move the target distance toward the first test cone 140 so that the metal sheath clamped by the first clamping mechanism 150 is aligned with the side surface of the first test cone 140 toward one end of the lifting plate 130, specifically:

[0090] The target distance by which the lifting plate 130 moves toward the first test cone 140 can be obtained by the difference between the initial position parameter and the real-time detection value of the first ranging sensor 160 . When the difference is equal to the target distance, the end of the sheath just fits with the inclined surface of the first test cone 140 .

[0091] The lifting plate 130 is controlled to move toward the first test cone 140, and the real-time position parameters of one end of the metal sheath clamped by the first clamping mechanism 150 toward the lifting plate 130 are detected in real time, specifically:

[0092] In the expansion test, after the inner wall at the expanded end of the sleeve abuts against the side of the first test cone 140, the side of the first test cone 140 will be tightly combined with the inner wall of the sleeve due to the expansion of the first test cone 140. Therefore, the real-time position parameter of one end of the metal sheath clamped by the first clamping mechanism 150 toward the lifting plate 130 is the distance moved by the expanded end of the sleeve relative to the side of the first test cone 140.

[0093] Among them, the real-time expansion multiple of the metal sheath clamped by the first clamping mechanism 150 when moving toward one end of the lifting plate 130 is determined according to the real-time position parameters and the geometric parameters of the first test cone 140, and when the real-time expansion multiple is equal to the preset target multiple, the lifting plate 130 stops moving.

[0094] According to the difference between the initial position parameter and the real-time position parameter and the taper of the first test cone 140, the real-time expansion value of the inner diameter of the expansion end of the sheath can be calculated by trigonometric function, and the real-time expansion multiple can be obtained according to the ratio of the real-time expansion value to the inner diameter of the expansion end of the sheath before expansion.

[0095] The final expansion value of the inner diameter of the expanded end of the metal sheath is obtained by multiplying the inner diameter of the expanded end of the metal sheath before expansion by a preset target multiple. According to the difference between the inner diameter of the expanded end of the metal sheath before expansion and the final expansion value of the inner diameter of the expanded end of the metal sheath and the taper of the first test cone 140, the relative movement distance of the expanded end of the metal sheath along the side of the first test cone 140 can be calculated by trigonometric function. The relative movement distance is the distance that the expanded end of the metal sheath moves along the side of the first test cone 140 when the expanded end of the sheath expands to the preset target multiple.

[0096] It is understandable that the inner diameter of the expanded end of the sheath is selected as the target parameter here because the inner wall of the sheath is always in contact with the surface of the first test cone 140 during the expansion process, so it is more accurate to select the inner diameter of the expanded end of the sheath as the calculation parameter. The value of the preset target multiple should be selected according to the material of the metal sheath and the usage scenario.

[0097] In some embodiments, Figure 1 As shown, in order to expand the application scope of the test device 100, the frame 110 also includes a second plate 112, the second plate 112 is arranged in parallel with the first plate 111, and the second plate 112 is installed on the side of the lifting plate 130 away from the first plate 111, so that the lifting plate 130 is restricted to move between the first plate 111 and the second plate 112, the test device 100 also includes a second test cone 170, a second clamping mechanism 180 and a second ranging sensor, wherein the second test cone 170 is fixedly installed on the side of the lifting plate 130 away from the first clamping mechanism 150, and the second clamping mechanism 180 is arranged on the second plate Part 112 faces one side of the lifting plate 130, and the second clamping mechanism 180 is configured so that when the metal sheath is clamped by the second clamping mechanism 180, the axis of the metal sheath is collinear with the axis of the second test cone 170, the second ranging sensor is connected to the frame 110 in a relatively fixed manner, the second ranging sensor includes a second transmitting part and a second receiving part, the second transmitting part emits a laser beam, the direction of the laser beam emitted by the second transmitting part is configured to be parallel to the side of the second test cone 170, and a gap is left between the laser beam emitted by the second transmitting part and the side of the second test cone 170, and the second receiving part receives the laser beam after reflection.

[0098] Among them, in the above-mentioned second test cone 170, the second clamping mechanism 180 and the second distance sensor, except that the taper of the second test cone 170 is different from that of the first test cone 140, the remaining structures, connection relationships, functions and effects are the same as those of the first test cone 140, the first clamping mechanism 150 and the first distance sensor 160, respectively, and the taper of the first test cone 140 and the taper of the second test cone 170 can be selected as any value between 30 and 60 degrees. Further, the control method when the second test cone 170 cooperates with the second clamping mechanism 180, the second distance sensor and the lifting plate 130 to perform an expansion test on the sheath is also the same as the control method when the first test cone 140 cooperates with the first clamping mechanism 150, the first distance sensor 160 and the lifting plate 130 to perform an expansion test on the sheath, so there is no need to repeat it.

[0099] Furthermore, in order to monitor the force that the sheath is subjected to during the test in real time online and to prevent the equipment from being overloaded, the test device 100 also includes a first pressure sensor and a second pressure sensor. The first pressure sensor is arranged on the lifting plate 130, and the first pressure sensor is located between the first clamping mechanism 150 and the lifting plate 130 to detect the pressure value borne by the metal sheath when the side of the first test cone 140 abuts against the port of the metal sheath clamped by the first clamping mechanism 150, and the second pressure sensor is arranged between the second clamping mechanism 180 and the second plate 112 to detect the pressure value borne by the metal sheath when the side of the second test cone 170 abuts against the port of the metal sheath clamped by the second clamping mechanism 180.

[0100] In other embodiments, Figure 1 As shown, in order to expand the application scope of the test device 100, the frame 110 also includes a second plate 112, the second plate 112 is arranged in parallel with the first plate 111, and the second plate 112 is fixedly installed on the side of the lifting plate 130 away from the first plate 111, so that the lifting plate 130 is restricted to move between the first plate 111 and the second plate 112, and the test device 100 also includes a second test cone 170, a second clamping mechanism 180 and a second distance measuring sensor, wherein the second test cone 170 is fixedly installed on the side of the second plate 112 facing the lifting plate 130, and the second clamping mechanism 180 is installed on the lifting plate 1 30 is away from the side of the first clamping mechanism 150, and the second clamping mechanism 180 is configured so that when the metal sheath is clamped by the second clamping mechanism 180, the axis of the metal sheath is colinear with the axis of the second test cone 170, the second ranging sensor is connected to the frame 110 in a relatively fixed manner, the second ranging sensor includes a second emitting part and a second receiving part, the second emitting part emits a laser beam, the direction of the laser beam emitted by the second emitting part is configured to be parallel to the side of the second test cone 170, and a gap is left between the laser beam emitted by the second emitting part and the side of the second test cone 170, and the second receiving part receives the laser beam after reflection.

[0101] Among them, in the above-mentioned second test cone 170, the second clamping mechanism 180 and the second distance sensor, except that the taper of the second test cone 170 is different from that of the first test cone 140, the remaining structures, connection relationships, functions and effects are the same as those of the first test cone 140, the first clamping mechanism 150 and the first distance sensor 160, respectively, and the taper of the first test cone 140 and the taper of the second test cone 170 can be selected as any value between 30 and 60 degrees. Further, the control method when the second test cone 170 cooperates with the second clamping mechanism 180, the second distance sensor and the lifting plate 130 to perform an expansion test on the sheath is also the same as the control method when the first test cone 140 cooperates with the first clamping mechanism 150, the first distance sensor 160 and the lifting plate 130 to perform an expansion test on the sheath, so there is no need to repeat it.

[0102] Furthermore, in order to monitor the force that the sheath is subjected to during the test in real time online and to prevent the equipment from being overloaded, the test device 100 also includes a first pressure sensor and a second pressure sensor. The first pressure sensor is arranged on the lifting plate 130, and the first pressure sensor is located between the first clamping mechanism 150 and the lifting plate 130 to detect the pressure value borne by the metal sheath when the side of the first test cone 140 abuts against the port of the metal sheath clamped by the first clamping mechanism 150, and the second pressure sensor is arranged between the second clamping mechanism 180 and the lifting plate 130 to detect the pressure value borne by the metal sheath when the side of the second test cone 170 abuts against the port of the metal sheath clamped by the second clamping mechanism 180.

[0103] In order to make the lifting plate 130 move in a controlled manner, as Figure 1 to Figure 2 As shown, the test device 100 also includes a driving mechanism 1100, which drives a motor 1101 and a ball screw 1102. The driving motor 1101 has an output shaft with controlled rotation, and the lifting plate 130 is connected to the driving motor 1101 through the ball screw 1102. The driving motor 1101 can be a servo motor, and the lifting plate 130 can be driven to rise and fall quantitatively through the precise control of the servo motor. Furthermore, a photoelectric encoder can be coaxially installed on the top of the ball screw 1102 to provide real-time feedback of the position information of the movement of the lifting plate 130.

[0104] This embodiment solves the problem that the expansion speed cannot be quantified and the non-uniform motion causes unstable test results during the manual control handle test of the jack-type test equipment. The equipment can set different speeds for uniform movement according to different standard requirements, and the test results are more stable and more in line with the test standard requirements.

[0105] In order to facilitate the expansion test to proceed smoothly, it is usually necessary to apply lubricating oil to the inner wall of the expansion end of the sheath for lubrication. In order to recycle and reduce pollution to the test environment, Figure 1 As shown, in one embodiment, the test device 100 further includes an oil guide seat 1110, an oil guide pipe 1120 and an oil storage box 1130. The oil guide seat 1110 is connected to the lifting plate 130. An oil guide groove is provided in the oil guide seat 1110. The oil guide groove is aligned with the first clamping mechanism 150 to receive the lubricating liquid dripping from the metal sheath. The oil guide pipe 1120 is arranged on the oil guide seat 1110 and communicates with the oil guide groove. The oil storage box 1130 is arranged on the lifting plate 130 and communicates with the oil outlet of the oil guide pipe 1120. The opening of the oil storage box 1130 faces upward. When the excess lubricating oil is collected through the oil guide groove, it can flow to the oil storage box 1130 through the oil guide pipe 1120, and the lubricating oil can be quickly dipped into the oil storage box 1130 for testing through the upward opening of the oil storage box 1130, thereby realizing recycling and reducing pollution to the test environment.

[0106] In order to limit the moving range of the lifting plate 130 to a desired range, as Figure 2 As shown, the test device 100 also includes a limiting mechanism 190, and the lifting plate 130 includes a through groove, the extension direction of the through groove is parallel to the axial direction of the guide shaft 121, and the limiting mechanism 190 includes a limiting shaft 191, a first limiting member 192 and a second limiting member 193, the limiting shaft 191 is fixedly connected to the frame 110, and the axis of the limiting shaft 191 is parallel to the axis of the guide shaft 121, the limiting shaft 191 is inserted in the through groove, the first limiting member 192 and the second limiting member 193 are both arranged outside the limiting shaft 191, and the distance between the two is defined as a preset spacing, the lifting plate 130 is located between the first limiting member 192 and the second limiting member 193, so that the moving range of the lifting plate 130 is within the preset spacing. Among them, the side surface of the first test cone 140 abuts against the port of the metal sheath clamped by the first clamping mechanism 150 until the diameter at the port of the metal sheath expands to a preset target multiple of the original diameter, and the moving distance of the lifting plate 130 is less than half of the preset spacing, thereby limiting the moving range of the lifting plate 130 to a required range while meeting the test requirements.

[0107] The above contents described in this specification are merely examples of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, as long as they do not deviate from the contents of the present specification or exceed the scope defined by the claims, they shall all fall within the protection scope of the present invention.

Claims

1. A test device for metal sheath expansion, characterized in that: include: A frame including a first plate; A guide mechanism, comprising a guide shaft and a guide sleeve, wherein the guide shaft is connected to the frame, and the guide sleeve is movably sleeved on the outside of the guide shaft, and the guide sleeve is configured to move along the axial direction of the guide shaft; a lifting plate, which moves in a controlled manner, the lifting plate being connected to the guide sleeve so that the lifting plate is restricted to move axially along the guide shaft; A first test cone is arranged on a side of the first plate member facing the lifting plate, and an axis of the first test cone is parallel to a moving direction of the lifting plate; a first clamping mechanism, disposed on a side of the lifting plate facing the first test cone, and the first clamping mechanism is configured to make the axis of the metal sheath collinear with the axis of the first test cone when the metal sheath is clamped by the first clamping mechanism; A first distance measuring sensor is connected to the frame in a relatively fixed manner, and the first distance measuring sensor includes: a first emitting part, wherein the first emitting part emits a laser beam, wherein the direction of the laser beam emitted by the first emitting part is configured to be parallel to the side surface of the first test cone, and a preset gap is left between the laser beam emitted by the first emitting part and the side surface of the first test cone, so as to irradiate the abutting end of the metal sheath when the end of the metal sheath clamped by the first clamping mechanism abuts against the first test cone; A first receiving unit, wherein the first receiving unit receives the reflected laser beam; A controller is connected to the lifting plate and the first ranging sensor to control the movement of the lifting plate through feedback data from the first ranging sensor, and the controller is configured to stop the movement of the lifting plate when a real-time expansion multiple of the metal sheath clamped by the first clamping mechanism toward one end of the lifting plate is equal to a preset target multiple.

2. The test device according to claim 1, characterized in that: The frame also includes: a second plate, the second plate being arranged in parallel with the first plate, and the second plate being arranged on a side of the lifting plate facing away from the first plate, so that the lifting plate is restricted to move between the first plate and the second plate; The test device also includes: a second test cone, the second test cone being arranged on a side of the lifting plate away from the first clamping mechanism; a second clamping mechanism, disposed on a side of the second plate member facing the lifting plate, and the second clamping mechanism is configured so that when the metal sheath is clamped by the second clamping mechanism, the axis of the metal sheath is collinear with the axis of the second test cone; A second distance measuring sensor is connected to the frame in a relatively fixed manner, and the second distance measuring sensor includes: a second emitting part, wherein the second emitting part emits a laser beam, wherein the direction of the laser beam emitted by the second emitting part is configured to be parallel to the side surface of the second test cone, and a preset gap is left between the laser beam emitted by the second emitting part and the side surface of the second test cone, so as to irradiate the abutting end of the metal sheath when the end of the metal sheath clamped by the second clamping mechanism abuts against the second test cone; A second receiving unit receives the reflected laser beam.

3. The test device according to claim 1, characterized in that: The frame also includes: a second plate, the second plate being arranged in parallel with the first plate, and the second plate being arranged on a side of the lifting plate facing away from the first plate, so that the lifting plate is restricted to move between the first plate and the second plate; The test device also includes: a second test cone, the second test cone being arranged on a side of the second plate member facing the lifting plate; a second clamping mechanism, arranged on a side of the lifting plate away from the first clamping mechanism, and the second clamping mechanism is configured so that when the metal sheath is clamped by the second clamping mechanism, the axis of the metal sheath is collinear with the axis of the second test cone; A second distance measuring sensor is connected to the frame in a relatively fixed manner, and the second distance measuring sensor includes: a second emitting part, wherein the second emitting part emits a laser beam, wherein the direction of the laser beam emitted by the second emitting part is configured to be parallel to the side surface of the second test cone, and a gap is left between the laser beam emitted by the second emitting part and the side surface of the second test cone, so as to irradiate the abutting end of the metal sheath when the end of the metal sheath clamped by the second clamping mechanism abuts against the second test cone; A second receiving unit receives the reflected laser beam.

4. The test device according to claim 1, characterized in that: Also includes: The driving mechanism comprises: A drive motor including an output shaft for controlled rotation; A ball screw, the lifting plate is transmission-connected to the driving motor via the ball screw.

5. The test device according to claim 1, characterized in that: Also includes: An oil guide seat connected to the lifting plate, an oil guide groove is provided on the oil guide seat, and the oil guide groove is aligned with the first clamping mechanism to receive the lubricating liquid dripping from the metal sheath; An oil guide pipe, arranged on the oil guide seat, the oil guide pipe being in communication with the oil guide groove; An oil storage box is arranged on the lifting plate, and the oil storage box is communicated with the oil outlet of the oil guide pipe.

6. The test device according to claim 2, characterized in that: Also includes: a first pressure sensor, which is disposed on the lifting plate and is located between the first clamping mechanism and the lifting plate, so as to detect the pressure value borne by the metal sheath when the side surface of the first test cone abuts against the end of the metal sheath clamped by the first clamping mechanism; The second pressure sensor is arranged between the second clamping mechanism and the second plate to detect the pressure value borne by the metal sheath when the side surface of the second test cone abuts against the port of the metal sheath clamped by the second clamping mechanism.

7. The test device according to claim 3, characterized in that: Also includes: a first pressure sensor, which is disposed on the lifting plate and is located between the first clamping mechanism and the lifting plate, so as to detect the pressure value borne by the metal sheath when the side surface of the first test cone abuts against the end of the metal sheath clamped by the first clamping mechanism; The second pressure sensor is arranged between the second clamping mechanism and the lifting plate to detect the pressure value borne by the metal sheath when the side surface of the second test cone abuts against the end of the metal sheath clamped by the second clamping mechanism.

8. The test device according to claim 1, characterized in that: The lifting plate is provided with a through slot, and the extending direction of the through slot is parallel to the axial direction of the guide shaft; The test device also includes: Limiting mechanism, including: A limiting shaft connected to the frame, wherein the axis of the limiting shaft is parallel to the axis of the guide shaft, and the limiting shaft is inserted into the through groove; A first limit member and a second limit member, wherein the first limit member and the second limit member are both arranged outside the limit shaft, and the distance between the two is defined as a preset spacing, and the lifting plate is located between the first limit member and the second limit member, so that the movement range of the lifting plate is within the preset spacing; wherein, after the side surface of the first test cone abuts against the port of the metal sheath clamped by the first clamping mechanism, when the diameter at the port of the metal sheath expands to a preset target multiple of 1.30 times the original diameter, the movement distance of the lifting plate is less than half of the preset spacing.

9. The control method of the test device according to any one of claims 1 to 8, characterized in that: include: Detecting initial position parameters of the first test cone and geometric parameters of the first test cone; Determine the target distance according to the initial position parameter and the diameter of the metal sheath clamped by the first clamping mechanism toward one end of the lifting plate; Controlling the lifting plate to move the target distance in a direction close to the first test cone, so that the metal sheath clamped by the first clamping mechanism is in contact with the side surface of the first test cone toward one end of the lifting plate; Controlling the lifting plate to move toward the direction close to the first test cone, and detecting in real time the real-time position parameters of the metal sheath clamped by the first clamping mechanism toward one end of the lifting plate; The real-time expansion multiple of the metal sheath clamped by the first clamping mechanism when it moves toward one end of the lifting plate is determined according to the real-time position parameter and the geometric parameters of the first test cone, and the lifting plate stops moving when the real-time expansion multiple is equal to the preset target multiple.

10. The control method of the test device according to claim 9, characterized in that: The real-time expansion multiple when the metal sheath clamped by the first clamping mechanism moves toward one end of the lifting plate is determined according to the real-time position parameter and the geometric parameter of the first test cone, and the lifting plate is stopped from moving when the real-time expansion multiple is equal to the preset target multiple. The real-time expansion multiple in this step can be obtained by the following method: According to the difference between the initial position parameters and the real-time position parameters and the taper of the first test cone, the real-time expansion value of the inner diameter of the metal sheath clamped by the first clamping mechanism toward one end of the lifting plate can be calculated by trigonometric function, and the real-time expansion multiple can be obtained according to the ratio of the real-time expansion value to the inner diameter of the sheath clamped by the first clamping mechanism before expansion toward one end of the lifting plate.

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