Testing device for vicat softening temperature of cable protection pipe and control method

Abstract

The invention belongs to the technical field of detection equipment, and particularly relates to a cable protection pipe vicat softening temperature test device and a control method, the test device comprises a test mechanism, a loading mechanism, a teasing needle mechanism and a control system, the test mechanism comprises an oil bath box and a liftable workbench, the working table comprises a weight tray and a sample tray, a pressing plate and a pressing needle which penetrates through the pressing plate and is in contact with a sample are arranged below the weight tray, the sample tray can enter or leave the oil bath box under the driving of the working table, and the loading mechanism comprises a weight suction cup and a depth measuring assembly which can move up and down and left and right; the weight suction cup is used for conveying the weight from the weight seat to the weight tray, and the depth measuring assembly is used for detecting the downward displacement of the pressing needle in the test process. According to the device, sample placement, preheating, weight loading, temperature rise detection and pressing needle separation are automatically completed in the whole process, the labor cost can be reduced, manual operation errors can be avoided, and therefore the detection precision and the detection efficiency are greatly improved.

Description

Technical Field

[0001] The invention belongs to the technical field of detection equipment, and in particular relates to a test device and a control method for the Vicat softening temperature of a cable protection tube. Background Art

[0002] High-voltage power cables are critical channels for urban power transmission. Cable protection conduits serve as a vital physical barrier protecting high-voltage power cables from external forces. Conducting quality and performance testing of cable protection conduits is a crucial measure for ensuring the operational reliability of these critical channels. Cable protection conduits are primarily made of two plastic materials, CPVC and MPP. They are subject to high temperatures in outdoor environments. The Vicat softening temperature test verifies the softening resistance of cable protection conduits under these conditions, ensuring they resist functional failure in underground, high-temperature environments.

[0003] However, the current conventional Vicat softening temperature test is mainly performed manually, and the quality and skills of personnel have a great impact on the test results. In addition, the test involves high temperatures, which poses certain safety risks. Automation and unmanned operation can significantly improve the standardization, efficiency and safety of operations, and are the technological development direction of the testing industry. Therefore, it is necessary to design a fully automatic Vicat softening temperature test device. Summary of the Invention

[0004] The purpose of the present invention is to solve the defects and shortcomings in the prior art and to provide a test device and control method for the Vicat softening temperature of a cable protection tube, which has a high degree of automation and can greatly improve the detection efficiency.

[0005] To achieve the above object, the technical solution adopted by the present invention is: a test device for the Vicat softening temperature of a cable protection tube, comprising:

[0006] A testing mechanism comprising an oil bath and a movable workbench, wherein the workbench comprises a weight tray and a sample tray in a nested structure, a pressing plate and a pressing needle passing through the pressing plate and contacting the sample are provided below the weight tray, and the sample tray can enter or leave the oil bath when driven by the workbench;

[0007] The loading mechanism includes a weight suction cup that can move up and down and left and right, and a depth measuring assembly. The weight suction cup is used to transfer the weight from the weight seat to the weight tray. The depth measuring assembly is used to detect the downward displacement of the indenter during the test;

[0008] The needle picking mechanism includes a clamping claw that can move left and right, and the clamping claw is used to pick up the pressing needle to provide a clearance space for placing or removing the sample;

[0009] A control system includes a PLC controller electrically connected to the testing mechanism, the loading mechanism and the needle picking mechanism.

[0010] Preferably, a fixing plate is arranged above the oil bath tank through a support frame, and a first mounting plate and a second mounting plate for mounting the loading mechanism and the needle picking mechanism respectively are arranged on the fixing plate, and the first mounting plate and the second mounting plate can move left and right on the fixing plate under the action of their respective driving assemblies.

[0011] Preferably, the first mounting plate is provided with an electric push cylinder arranged vertically, and the weight suction disc and the depth measuring assembly are connected to the output end of the electric push cylinder and can move up and down under the action of the electric push cylinder.

[0012] Preferably, the needle picking mechanism is connected below the second mounting plate through a third mounting plate, and the third mounting plate is further provided with a driving member for driving the clamping jaw.

[0013] Preferably, the clamping jaw adopts a two-pronged tine structure, and the bottom surface of the tine is designed in an arc shape matched with the pressing needle.

[0014] Preferably, the weight seat is provided with two groups, each group having four, for accommodating 50N and 10N weights with the same diameter and different heights, and the weights are made of magnetic stainless steel, and the diameters of the weight seat and the weight suction disc are not less than the diameter of the weight.

[0015] Preferably, the weight tray is arranged above the sample tray, the sample tray is suitable for two specifications of 50x10mm and 10x10mm samples, and the oil bath tank is further provided with a temperature measuring assembly.

[0016] A control method for the cable protection pipe Vicat softening temperature test device, comprising the following steps:

[0017] S1, sample placement: the PLC controller controls the clamping jaw of the needle picking mechanism to pick up the pressing needle, the mechanical arm assembly places the sample on the sample tray, and the clamping jaw is retracted after the placement is completed;

[0018] S2, sample preheating: the workbench drives the sample tray to descend into the oil bath tank for preheating, and the preheating temperature is 20-23℃;

[0019] S3, weight loading: after preheating, the workbench rises, the PLC controller controls the loading mechanism to select the weight of corresponding mass according to the type of the sample, and the weight is loaded onto the weight tray through the weight tray;

[0020] S4, depth measuring assembly in place: the depth measuring assembly is controlled to be in close contact with the top of the loaded weight, and the displacement amount is adjusted to zero;

[0021] S5, temperature rising test: the workbench and the depth measuring assembly are synchronously lowered to the sample tray into the oil bath box, the oil bath box is heated at a rate of 50±5 DEG C per hour, the depth measuring assembly records the displacement of the pressing needle in real time, when the displacement reaches 1±0.01mm, the current temperature is recorded as the test result temperature, and the test process is ended;

[0022] S6, sample separation: the workbench drives the sample tray to rise and leave the oil bath box, the needle picking mechanism picks up the pressing needle through the clamping jaw, that is, the pressing needle and the sample are separated, and the next detection cycle is prepared.

[0023] After the above technical scheme is adopted, the test device and the control method for the Vicat softening temperature of the cable protection pipe provided by the application have the following beneficial effects:

[0024] The application realizes full-process automation to complete sample placement, preheating, weight loading, temperature rising detection and pressing needle separation, which can not only reduce labor cost, but also avoid manual operation errors, thereby greatly improving detection precision and detection efficiency, and is suitable for heat resistance detection of MPP, CPVC and other material cable protection pipes, and can meet the high-precision and high-time-efficiency industrial detection requirements. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 Fig. 1 is a structural schematic view of the test device for the Vicat softening temperature of the cable protection pipe of the application;

[0026] Figure 2 Fig. 2 is a structural schematic view of the workbench part in the application;

[0027] Figure 3 Fig. 3 is a structural schematic view of the loading mechanism in the application;

[0028] Figure 4 Fig. 4 is a structural schematic view of the needle picking mechanism in the application;

[0029] Figure 5 Fig. 5 is a front view of the loading mechanism and the needle picking mechanism in the application.

[0030] Wherein: test mechanism 1, oil bath box 11, workbench 12, weight tray 13, sample tray 14, pressing plate 15, pressing needle 16, loading mechanism 2, weight suction disc 21, depth measuring assembly 22, weight 23, weight seat 24, electric push cylinder 25, needle picking mechanism 3, clamping jaw 31, third mounting plate 32, driving part 33, control system 4, support frame 5, fixed plate 51, first mounting plate 52, second mounting plate 53. DETAILED DESCRIPTION

[0031] The application will be further described in conjunction with the drawings and specific embodiments, obviously, the described embodiments are only a part of the embodiments of the application, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative, but not as any limitation on the application and its application or use. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the application.

[0032] It should be noted that the terms used herein are only intended to describe specific embodiments, and are not intended to limit the exemplary embodiments according to the present application. As used herein, the singular form is intended to include the plural form, unless the context clearly indicates otherwise, and it should be understood that when the terms "comprise" and / or "include" are used in the specification, there is a feature, step, operation, device, component and / or combination thereof.

[0033] Unless specifically stated otherwise, the relative arrangement of components and steps, numerical expressions, and numerical values set forth in the various embodiments described herein are not meant to limit the scope of the present application. It is also to be understood that the various figures shown in the drawings are not drawn to scale and that, for clarity, not all components are shown in each figure. Techniques, methods, and devices known to those of ordinary skill in the art can not be discussed in detail, but are to be considered as part of the description of the present application. In all examples shown and discussed herein, any specific value is to be interpreted as merely an example, and not as a limitation. Thus, other examples of the exemplary embodiments can have different values. It is to be noted that like reference numerals and letters refer to like items in the following drawings, and thus, once an item is defined in one drawing, it need not be discussed further in subsequent drawings.

[0034] In the description of the application, it should be understood that the orientation words such as "front, back, up, down, left, right", "horizontal, vertical, perpendicular, horizontal" and "top, bottom" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the application and simplifying the description, and does not indicate and imply that the indicated device or element must have a specific orientation or be constructed and operated in a specific orientation, therefore, it cannot be understood as a limitation on the scope of protection of the application; the orientation words "inner, outer" refer to the inner and outer of the contour of each component itself.

[0035] For purposes of the description hereinafter, spatial relative terms, such as "above", "below", "upper", "lower", and the like, can be used to describe the relative position of one element or feature to another as illustrated in the figures. It will be understood that the spatial relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientations depicted in the figures. For example, if a device in the figures is inverted, then a dependent "above" or "upper" becomes "below" or "lower" respectively. Thus, the exemplary term "above" can encompass both an orientation of above and below. The device can be otherwise oriented (rotated 90 degrees or at other orientations) and the spatial relative descriptors used herein interpreted accordingly.

[0036] In addition, it should be pointed out that the use of the words "first", "second" and the like to define parts is only for the convenience of distinguishing the corresponding parts, and the above words have no special meaning unless otherwise stated, and therefore cannot be understood as limiting the scope of protection of the present application.

[0037] As Figures 1-5 The test device for the Vicat softening temperature of the cable protection pipe provided by the present application comprises a testing mechanism 1, a loading mechanism 2, a needle lifting mechanism 3 and a control system 4.

[0038] The testing mechanism 1 comprises an oil bath tank 11 and a liftable workbench 12, the workbench 12 comprises a weight tray 13 and a sample tray 14 in a nested structure, the weight tray 13 is arranged above the sample tray 14, a pressing plate 15 and a pressing needle 16 which is in contact with the sample and passes through the pressing plate 15 are arranged below the weight tray 13, the sample tray 14 can enter or leave the oil bath tank 11 under the driving of the workbench 12, specifically, the sample tray 14 is suitable for two specifications of 50*10mm and 10*10mm, a temperature measuring assembly is further arranged on the oil bath tank 11, the loading mechanism 2 comprises a weight suction disc 21 which can move up and down and left and right and a depth measuring assembly 22, the weight suction disc 21 is used to send the weight 23 from a weight seat 24 to the weight tray 13, the depth measuring assembly 22 is used to detect the downward displacement of the pressing needle 16 during the test, the needle lifting mechanism 3 comprises a clamping jaw 31 which can move left and right, the clamping jaw 31 is used to lift the pressing needle 16 to provide a space for placing or taking out the sample, the control system 4 comprises a PLC controller, the PLC controller is electrically connected with the testing mechanism 1, the loading mechanism 2 and the needle lifting mechanism 3.

[0039] The oil bath box 11 is provided with a fixed plate 51 above the support frame 5, the first mounting plate 52 and the second mounting plate 53 for mounting the loading mechanism 2 and the needle picking mechanism 3 are arranged on the fixed plate 51, the first mounting plate 52 and the second mounting plate 53 can move left and right on the fixed plate 51 under the action of the respective driving assemblies, specifically, the fixed plate 51 is provided with guide rails that are in sliding fit with the first mounting plate 52 and the second mounting plate 53, the first mounting plate 52 and the second mounting plate 53 can move left and right along the corresponding guide rails under the drive of the respective servo motors, further, the first mounting plate 52 and the second mounting plate 53 are respectively located on the left and right sides of the fixed plate 51, that is, the loading mechanism 2 and the needle picking mechanism 3 are respectively arranged on the left and right sides above the oil bath box 11.

[0040] The first mounting plate 52 can realize the left and right movement of the loading mechanism 2, in order to further realize the up and down movement of the loading mechanism 2, the first mounting plate 52 is provided with an electric push cylinder 25 arranged vertically, the weight suction disc 21 and the depth measuring assembly 22 are connected with the output end of the electric push cylinder 25 and can move up and down under the action of the electric push cylinder 25, wherein the weight seat 24 is arranged below the loading mechanism 2 and is provided with two groups, each group has four, and is respectively used for accommodating weights 23 of different masses, specifically, the weights 23 of different masses have the same diameter and different heights, including 10N and 50N weights, the diameters are all 80.0mm, and the heights are 60mm and 300mm respectively, the weight 23 is selected from a magnetic stainless steel material, in order to further ensure the convenience of grabbing, moving and loading the weight, and considering the gravity center deviation and the cooperation of the weight carrier, the deviation accuracy of the carrier is ±0.2mm, the diameters of the weight seat 24 and the weight suction disc 21 are not less than the diameter of the weight 23, and the diameter of the weight seat 24 is preferably 80.1mm, and the diameter of the weight suction disc 21 is preferably 80.2mm.

[0041] In order to further ensure the transverse movement effect of the needle picking mechanism and ensure that the needle picking mechanism can pick up the pressure needle 16, the needle picking mechanism 3 is connected below the second mounting plate 53 through a third mounting plate 32, the third mounting plate 32 is further provided with a driving piece 33 for driving the clamping jaw 31, the clamping jaw 31 adopts a two-pronged tooth structure, and the bottom surface of the pronged tooth is designed in an arc shape matched with the pressure needle 16, specifically, the radius of the circular arc is 11.02mm, so as to ensure the orderly separation of the pressure needle 16 and the sample.

[0042] The application also provides a control method for the cable protection pipe vicat softening temperature test device.

[0043] S1, sample placement: the PLC controller controls the clamping jaw 31 of the needle picking mechanism 3 to pick up the pressure needle 16, the mechanical arm assembly places the sample on the sample tray 14, and after the placement is completed, the clamping jaw 31 retreats.

[0044] S2, sample preheating: the workbench 12 drives the sample tray 14 to descend into the oil bath tank 11 for preheating, and the oil bath tank 11 is maintained in a room temperature environment of 18-28℃; for the MPP pipe sample in this embodiment, the preheating temperature is strictly controlled at 20-23℃ to ensure uniform heating of the sample;

[0045] S3, weight loading: after preheating, the workbench 12 rises, and the PLC controller controls the loading mechanism 2 to select the corresponding weight 23 according to the sample type, and the weight 23 is loaded onto the weight tray 13 through the weight tray 13;

[0046] S4, depth measuring assembly in place: control the depth measuring assembly 22 to be in close contact with the top of the loaded weight 23, and adjust the displacement to zero;

[0047] S5, temperature rise test: the workbench 12 and the depth measuring assembly 22 are lowered synchronously into the sample tray 14 into the oil bath tank 11, the oil bath tank 11 is heated at a rate of 50±5℃ per hour, and the depth measuring assembly 22 records the displacement of the pressure needle 16 in real time; when the displacement reaches 1±0.01mm, the current temperature is recorded as the test result temperature, and the test process is completed;

[0048] S6, sample separation: the workbench 12 drives the sample tray 14 to rise and leave the oil bath tank 11, and the needle picking mechanism 3 picks up the pressure needle 16 through the clamping jaw 31, i.e. separates the pressure needle 16 from the sample, and prepares for the next detection cycle.

[0049] In summary, the test device and control method for the Vicat softening temperature of the cable protection pipe provided by the application realize full-process automation of sample placement, preheating, weight loading, temperature rise detection, and pressure needle separation, which can not only reduce labor costs, but also avoid manual operation errors, thereby greatly improving detection accuracy and detection efficiency, and is suitable for heat resistance detection of MPP, CPVC, and other material cable protection pipes, and can meet the high-precision and high-time-efficiency industrial detection requirements.

[0050] The above describes only the preferred specific embodiments of the application, but the protection scope of the application is not limited thereto, and any person skilled in the art can make equivalent replacements or changes to the technical solutions and inventive concepts of the application within the technical scope disclosed by the application, which should be covered within the protection scope of the application.

Claims

1. A test device for the Vicat softening temperature of a cable protection tube, characterized in that: include: A testing mechanism (1) includes an oil bath (11) and a workbench (12) that can be lifted and lowered. The workbench (12) includes a weight tray (13) and a sample tray (14) in a nested structure. A pressing plate (15) and a pressing needle (16) that passes through the pressing plate (15) and contacts the sample are provided below the weight tray (13). The sample tray (14) can enter or leave the oil bath (11) under the drive of the workbench (12). A loading mechanism (2), the loading mechanism (2) comprising a weight sucker (21) movable up and down and left and right, and a depth measuring assembly (22), the weight sucker (21) being used to deliver a weight (23) from a weight seat (24) to a weight tray (13), and the depth measuring assembly (22) being used to detect a downward displacement of a pressure needle (16) during a test; A needle picking mechanism (3), the needle picking mechanism (3) comprising a clamping claw (31) movable leftward and rightward, the clamping claw (31) being used to pick up the pressing needle (16) to provide an escape space for placing or removing the sample; A control system (4) includes a PLC controller electrically connected to a testing mechanism (1), a loading mechanism (2) and a needle picking mechanism (3).

2. A test device for the Vicat softening temperature of a cable protection tube according to claim 1, characterized in that: A fixed plate (51) is provided above the oil bath box (11) via a support frame (5). A first mounting plate (52) and a second mounting plate (53) for mounting the loading mechanism (2) and the needle picking mechanism (3) are provided on the fixed plate (51). The first mounting plate (52) and the second mounting plate (53) can move left and right in a horizontal direction on the fixed plate (51) under the action of their respective driving components.

3. A test device for the Vicat softening temperature of a cable protection tube according to claim 2, characterized in that: The first mounting plate (52) is provided with a vertically arranged electric push cylinder (25), and the weight suction cup (21) and the depth measuring assembly (22) are connected to the output end of the electric push cylinder (25) and can move up and down under the action of the electric push cylinder (25).

4. A test device for the Vicat softening temperature of a cable protection tube according to claim 2, characterized in that: The needle picking mechanism (3) is connected to the bottom of the second mounting plate (53) via a third mounting plate (32), and a driving member (33) for driving the clamping claw (31) is also provided on the third mounting plate (32).

5. The test device for the Vicat softening temperature of a cable protection tube according to claim 1, characterized in that: The clamping claw (31) adopts a two-fork-teeth structure, and the bottom surface of the fork teeth is designed to be arc-shaped and compatible with the pressing needle (16).

6. A test device for the Vicat softening temperature of a cable protection tube according to claim 1, characterized in that: The weight seats (24) are provided with two groups, each group of four, respectively used to accommodate 50N and 10N weights (23) of the same diameter and different heights. The weights (23) are made of magnetic stainless steel. The diameters of the weight seats (24) and the weight suckers (21) are not less than the diameter of the weights (23).

7. The test device for the Vicat softening temperature of a cable protection tube according to claim 1, characterized in that: The weight tray (13) is arranged above the sample tray (14). The sample tray (14) is suitable for samples of two specifications: 50×10 mm and 10×10 mm. The oil bath box (11) is also provided with a temperature measuring component.

8. A control method for the cable protection tube Vicat softening temperature test device according to any one of claims 1 to 7, characterized in that: The following steps are involved: S1. Sample placement: The PLC controller controls the clamping claw (31) of the needle picking mechanism (3) to pick up the pressing needle (16), and the mechanical arm assembly places the sample on the sample tray (14). After the placement is completed, the clamping claw (31) retracts; S2. Sample preheating: The workbench (12) drives the sample tray (14) down into the oil bath (11) for preheating at a temperature of 20-23°C. S3, weight loading: After preheating, the workbench (12) rises, and the PLC controller controls the loading mechanism (2) to select a weight (23) of corresponding mass according to the sample type, and loads the weight (23) onto the weight tray (13) through the weight tray (13); S4, the depth measuring component is in place: the depth measuring component (22) is controlled to be in close contact with the top of the loaded weight (23), and the displacement is adjusted to zero; S5. Temperature rise test: the workbench (12) and the depth measuring assembly (22) are synchronously lowered to the sample tray (14) and enter the oil bath (11). The oil bath (11) is heated at a rate of 50±5°C per hour. The depth measuring assembly (22) records the displacement of the pressure needle (16) in real time. When the displacement reaches 1±0.01mm, the current temperature is recorded as the test result temperature, and the test process ends. S6. Sample separation: The workbench (12) drives the sample tray (14) to rise and leave the oil bath (11), and the needle picking mechanism (3) picks up the pressure needle (16) through the clamping claw (31), that is, the pressure needle (16) and the sample are separated, and the next detection cycle is prepared.

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