Method for determining the design size of a routing slot and test device

Abstract

This invention discloses a method for determining the design dimensions of a cable tray, comprising: step S1, pre-checking the physical parameters of the cable, wherein the physical parameters include at least the wire diameter and the resistance to deformation under external force; step S2, setting up multiple test boxes, and respectively opening cable trays of different sizes on each of the test boxes according to the wire diameter and the resistance to deformation under external force; step S3, assembling the cable and the test boxes, and testing the sealing performance of the test boxes, wherein the sealing performance includes at least waterproof performance and dustproof performance; step S4, obtaining the sealing performance test results of each test box, wherein the test results include at least waterproof performance test results and dustproof performance test results; and step S5, comparing the sealing performance test results of each test box, and determining the design dimensions of the cable tray based on the test results.

Description

Technical Field

[0001] This invention relates to the field of general electrical engineering, and more particularly to a method and testing apparatus for determining the design dimensions of cable trays. Background Technology

[0002] Enclosure protection rating is a crucial parameter for ensuring product reliability, and many industry standards and specifications clearly define the enclosure protection rating for products. In the elevator industry, the type test rules (TSG T7007-2022) explicitly require that the enclosure protection rating be clearly indicated on the drive unit's nameplate, and that the nameplate be placed in a prominent position.

[0003] Taking a machine-room-less elevator traction machine as an example, the encoder adapter cable needs to be led out from the inside to the control cabinet, and the oil pipe needs to be led out from the inside to the front of the traction machine. This means that a slot needs to be opened at a certain location on the traction machine to arrange the wiring. Developers need to design appropriate wiring slot dimensions and tolerances to ensure that the equipment meets the enclosure protection level requirements while arranging electrical equipment wiring. However, the deformation of hoses or cables of different materials and manufacturers after being compressed is often inconsistent. It is difficult for designers to accurately design this dimension without testing. The method of determining the slot size directly on the assembled product through testing is time-consuming, labor-intensive, costly, and of low value. Once the enclosure protection level is found to be unqualified, the corresponding parts must be replaced, which greatly extends the product trial production cycle. Summary of the Invention

[0004] The Summary of the Invention introduces a series of simplified concepts, all of which are simplifications of existing technologies in the field, which will be further described in detail in the Detailed Description section.

[0005] The technical problem to be solved by this invention is how to determine the design dimensions of the cable tray simply and efficiently.

[0006] To solve the above-mentioned technical problems, the present invention provides a method for determining the design dimensions of cable trays, comprising:

[0007] Step S1: Perform a preliminary inspection of the physical parameters of the wiring, including at least the wire diameter and the ability to resist deformation under external force.

[0008] Step S2: Set up multiple test boxes, and open wiring grooves of different sizes on each test box according to the wire diameter and the resistance to deformation under external force.

[0009] Step S3: After assembling the wiring and the test box, test the sealing performance of the test box. The sealing performance includes at least waterproof and dustproof performance.

[0010] Step S4: Obtain the sealing performance test results of each test box, including at least the waterproof performance test results and the dustproof performance test results.

[0011] Step S5: Compare the sealing performance test results of each test box, and determine the design dimensions of the wiring trough based on the test results.

[0012] Preferably, in step S1, the ability of the wiring material to resist deformation under external force refers to the change in wire diameter of at least one cross-section of the wiring material under a preset clamping force.

[0013] Preferably, in step S1, the resistance of the wiring material to deformation under external force refers to the average value of the wire diameter variation of multiple cross sections of the wiring material under a preset clamping force.

[0014] Preferably, in step S2, the specific method for opening wiring grooves of different sizes on the test box is as follows: the width and depth of the wiring groove in one test box are equal to the wire diameter of the wiring material, and the other test boxes are divided into a first group of test boxes and a second group of test boxes; the depth of the wiring grooves in the first group of test boxes is equal to the wire diameter of the wiring material, and the width gradually changes towards being smaller than the wire diameter of the wiring material; the width of the wiring grooves in the second group of test boxes is equal to the wire diameter of the wiring material, and the depth gradually changes towards being smaller than the wire diameter of the wiring material; the range of the gradual change towards being smaller than the wire diameter of the wiring material is adapted to the performance of the wiring material in resisting deformation under the action of external force.

[0015] Preferably, the wiring groove opened on the test box in step S2 is a flat-bottomed groove or a round-bottomed groove.

[0016] Preferably, the waterproof performance test result in step S4 refers to the measurement of the dyed area or color of the absorbent paper inside the test box.

[0017] Preferably, the dustproof performance test result in step S4 refers to the measurement of the diamond grit introduced into the test box.

[0018] Preferably, in step S3, when conducting the waterproof performance test, the spray direction of the spray device is directed towards the junction of the test box and the wiring.

[0019] Preferably, in step S3, when conducting the dustproof performance test, the emission direction of the dust emission device faces the junction between the test box and the wiring.

[0020] The present invention also provides a test apparatus for determining the design dimensions of cable trays, comprising a frame assembly and multiple test boxes;

[0021] The frame assembly includes a frame, a cover plate, a partition, and a sealing ring, used for installing and fixing the test box body;

[0022] The frame has mounting positions for fixing the test box; the partition is placed in the inner cavity of the frame, thereby dividing the inner cavity into several independent spaces for isolating different groups of test boxes; the cover is connected to the frame through the sealing ring and fixed by bolts.

[0023] The test box includes a cable tray box and a cable tray cover, which are used to simulate the interaction between the cable tray and the cable. The cable tray is formed on the cable tray box.

[0024] Compared with the prior art, the technical effects that this invention can achieve are:

[0025] By fully utilizing the characteristics of orthogonal control experiments and the physical performance parameters of the cables under test, a series of cable trays with progressively larger sizes are opened in the experimental box assembly. Dustproof and waterproof tests are conducted through a working condition simulation device. Multiple sets of cable trays can be tested simultaneously. It has the advantages of simple structure, high efficiency, low cost, and strong adaptability. This allows developers to determine the cable tray size at the beginning of the design process or select appropriate wire diameter and material cables or flexible conduits based on existing cable tray sizes.

[0026] The testing apparatus of the present invention can simulate a foreign object of a certain diameter using a special test tool when the IP4X rating is below, and test whether the test tool can penetrate the test paper. Attached Figure Description

[0027] The accompanying drawings are intended to illustrate the general characteristics of the methods, structures, and / or materials used in specific exemplary embodiments of the invention, supplementing the description in the specification. However, the drawings are schematic diagrams not drawn to scale and may not accurately reflect the precise structural or performance characteristics of any of the given embodiments. The drawings should not be construed as limiting or restricting the range of numerical values ​​or properties covered by exemplary embodiments of the invention. The invention will now be described in further detail with reference to the accompanying drawings and specific embodiments:

[0028] Figure 1 This is a schematic diagram illustrating the steps of the method for determining the design dimensions of the cable tray in Embodiment 1 of the present invention;

[0029] Figure 2 This is a schematic diagram of the experimental apparatus structure of Embodiment 2 of the present invention;

[0030] Figure 3 for Figure 2 AA section view;

[0031] Figure 4 This is a schematic diagram of a single test box structure according to Embodiment 2 of the present invention;

[0032] Figure 5This is a schematic diagram of the internal cavity of the test box in Embodiment 2 of the present invention;

[0033] Figure 6 This is a schematic diagram of the spraying device and dust emission device of Embodiment 2 of the present invention. Detailed Implementation

[0034] The following specific embodiments illustrate the implementation of the present invention. Those skilled in the art can fully understand other advantages and technical effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through different specific embodiments, and the details in this specification can also be applied based on different viewpoints, with various modifications or changes made without departing from the overall design concept of the invention. It should be noted that, unless otherwise specified, the following embodiments and features can be combined with each other. The following exemplary embodiments of the present invention can be implemented in many different forms and should not be construed as being limited to the specific embodiments set forth herein. It should be understood that these embodiments are provided to make the disclosure of the present invention thorough and complete, and to fully convey the technical solutions of these exemplary embodiments to those skilled in the art.

[0035] Example 1

[0036] This embodiment provides a method for determining the design dimensions of cable trays, including:

[0037] Step S1: Perform a preliminary inspection of the physical parameters of the wiring, including at least the wire diameter and the ability to resist deformation under external force.

[0038] Step S2: Set up multiple test boxes, and open wiring grooves of different sizes on each test box according to the wire diameter and the resistance to deformation under external force.

[0039] Step S3: After assembling the wiring and the test box, test the sealing performance of the test box. The sealing performance includes at least waterproof and dustproof performance.

[0040] Step S4: Obtain the sealing performance test results of each test box, including at least the waterproof performance test results and the dustproof performance test results.

[0041] Step S5: Compare the sealing performance test results of each test box, and determine the design dimensions of the wiring trough based on the test results.

[0042] For example, the wiring material refers to cables or hoses. The wire diameter and resistance to deformation under external force of the wiring material can be determined by placing the cable or hose freely on a test bench, measuring and recording its outer diameter using a digital vernier caliper; then applying a small clamping force (approximately 3N) inwards with the movable side of the caliper, and observing the range of dimensional change displayed on the meter. This determines the degree of deformation caused by compression in the wire diameter direction, i.e., the change in wire diameter at least one cross-section of the wiring material under the preset clamping force. To ensure the reliability of the results, multiple cross-sections of the cable or hose can be tested, and the average value can be taken; that is, the average value of the wire diameter changes of multiple cross-sections of the wiring material under the preset clamping force.

[0043] In step S2, the specific method for opening wiring slots of different sizes on the test box is as follows: the width and depth of the wiring slots in one test box are equal to the wire diameter, and this test box is set as the calibration test box; the other test boxes are divided into a first group of test boxes and a second group of test boxes; the depth of the wiring slots in the first group of test boxes is equal to the wire diameter, and the width gradually changes towards a direction smaller than the wire diameter; the width of the wiring slots in the second group of test boxes is equal to the wire diameter, and the depth gradually changes towards a direction smaller than the wire diameter; the range of the gradual change towards a direction smaller than the wire diameter is adapted to the resistance of the wiring to deformation under external force.

[0044] Specific implementation methods for performance matching include, for example, specifying the variation value δ of the size of adjacent cable trays between test groups based on the resistance to deformation under external force. In principle, to ensure a certain degree of compression after the cable tray and the tested cable are fitted together, the design size of the cable tray is less than or equal to the diameter of the tested cable or hose. Furthermore, the better the resistance to deformation of the tested cable or hose, the smaller the variation value δ of the size of the cable trays on adjacent test boxes. By presetting a size variation value δ, two schemes are set: one with a constant depth D and a gradually changing width W, and the other with a constant width W and a gradually changing depth D. Taking the second group with a gradually changing depth D as an example, the depth dimension of the cable tray in any test box within the group is D. i ;D i Satisfy the following mathematical relationship:

[0045] D i =Φ-iδ

[0046] Where i+1 represents the number of test boxes in the second group. Finally, the total number of test boxes n required for the final test is determined by the number of test boxes in the depth gradient scheme and width gradient scheme test groups.

[0047] In addition, the wiring groove opened on the test box in step S2 is a flat-bottomed groove or a round-bottomed groove.

[0048] For sealing performance testing, waterproof performance testing can be conducted using a spray device, while dustproof performance testing can be conducted using a dust emission device.

[0049] The waterproof performance test results are exemplified by measuring the dyed area or color of the absorbent paper inside the test box. During the test, absorbent paper is placed inside the test box, and the spray direction of the spray device is directed towards the junction between the test box and the wiring.

[0050] For example, the dustproof performance test results are tested by measuring the amount of diamond sand entering the test chamber, such as by a dust detection sensor. During the dustproof performance test, the dust emission device is directed towards the junction of the test chamber and the wiring.

[0051] Finally, by comparing the test results of each group, the test box with the best sealing effect was obtained, and the optimal design size of the wiring trough was finally determined.

[0052] The method in this embodiment allows for the creation of cable tray boxes with corresponding sizes or shapes by varying the diameter and material of the cable or hose under test, or the shape of the slotted portion of the outer casing of large equipment. This method offers high flexibility, a wide range of experiments, and strong versatility.

[0053] Example 2

[0054] like Figures 2 to 5 As shown, this embodiment provides a test device for determining the design dimensions of cable trays, including a frame assembly and multiple test boxes;

[0055] The frame assembly includes a frame 1, a cover plate 2, a partition plate, and a sealing ring 6, which are used to install and fix the experimental box body;

[0056] The frame 1 has mounting positions for fixing the test box; the partition is placed in the inner cavity of the frame 1, thereby dividing the inner cavity into several independent spaces for isolating different groups of test boxes. The division can be achieved by adding partitions in the cavity and then bonding them or by making them uniformly with the frame 1; the cover plate 2 is connected to the frame through the sealing ring 6 and is fixed by bolts to ensure that external dust or water cannot enter the cavity from the top of the test device.

[0057] The test box includes a cable tray box 5 and a cable tray cover 3, which are used to simulate the cooperation between the cable tray and the cable 4. The cable tray is opened on the cable tray box 5.

[0058] The cable tray box 5 is a box-shaped container with an open top surface. The material can be specified according to the actual product situation, or it can be uniformly made of rigid plastic. Its structure consists of cable trays of different sizes and shapes on the open end of the mounting surface that is fixed to the frame 1.

[0059] The width and depth of the wiring groove in one test box are equal to the wire diameter. The other test boxes are divided into a first group of test boxes and a second group of test boxes. The depth of the wiring groove in the first group of test boxes is equal to the wire diameter, and the width gradually changes towards a direction smaller than the wire diameter. The width of the wiring groove in the second group of test boxes is equal to the wire diameter, and the depth gradually changes towards a direction smaller than the wire diameter. The range of the gradual change towards a direction smaller than the wire diameter is adapted to the resistance of the wiring to deformation under external force.

[0060] Absorbent paper 7 is placed at the bottom of the inner cavity of the cable tray box 5. The cable to be tested 4 is then inserted into the cable tray of the cable tray box 5, pressed down using the cable tray cover 3, and secured with bolts. To increase testing efficiency, this embodiment allows for the simultaneous testing of multiple test boxes with cable trays of different sizes. To ensure the accuracy of the test results is not affected by other factors, all operations within the same experimental group remain consistent, except for the size and shape of the cable trays.

[0061] like Figure 6 As shown, the spray device 8 used in the test is a complete set of equipment, including a water tank, a water pump, a mounting base, and spray heads. The spray heads are located above the test box assembly and can simulate the external water immersion conditions of the equipment according to the test requirements, spraying colored water onto the junction of the test box and the wiring. The water pump in the spray device can control the water flow rate according to the test requirements, and the mounting surface of the wiring groove of the test box can rotate at any angle relative to the spray heads to maximize the fulfillment of real working conditions.

[0062] like Figure 6 As shown, the dust emission device 9 used in the test is also a complete set of equipment, including a centrifugal fan, a sand box, an air duct guide device and a mounting base. The position of the air outlet of the centrifugal fan can be adjusted by the mounting base. The air inlet of the centrifugal fan is connected to one end of the sand box. The sand box is filled with a sand leakage device and fine diamond abrasive. It can simulate the dust-related working conditions outside the equipment according to the test requirements and emit colored diamond abrasive to the junction of the test box and the wiring.

[0063] To control the amount of dust according to the test requirements, the size of the sand leakage interface of the sand leakage device in the dust emission device and the wind speed of the centrifugal fan can be adjusted accordingly. The air outlet of the centrifugal fan can rotate at any angle relative to the wiring trough mounting surface of the test box to maximize the satisfaction of various real working conditions.

[0064] After completing the above tests, the amount of water entering the cable tray is determined by the dyed area or color depth of the absorbent paper inside the cable tray box in each test group, thereby determining the waterproof effect of the cable tray of the current size; the amount of diamond grit entering the cable tray box in each test group is used to determine the dustproof effect of the cable tray of the current size.

[0065] Finally, after initially selecting the most suitable cable tray size using the above method, the cable tray cover plate 3 can be replaced with the cover plate used in actual production to simulate the real extrusion conditions. Based on the real conditions, the cable tray size required by the designer can be accurately obtained.

[0066] The testing apparatus of this embodiment can perform waterproof and dustproof tests according to the protection level requirements of GB / T 4942-2021 for the overall structure of rotating electric machines, ensuring the waterproof and dustproof performance of the cable trays. The testing apparatus is easy to design and manufacture, featuring a short manufacturing cycle and low manufacturing cost. It meets the design dimensions of cable trays in the outer casing of large equipment with minimal cost and simple operation, and can simultaneously test multiple sets of dimensions, offering flexibility and convenience. By adjusting the water flow and wind pressure through the spray device and dust emission device, extreme working conditions can be realistically simulated, maximizing the fulfillment of testing requirements.

[0067] Unless otherwise defined, all terms used herein (including technical and scientific terms) shall have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. It will also be understood that, unless expressly defined herein, terms such as those defined in a general dictionary shall be interpreted as having the meaning consistent with their meaning in the relevant field context, and not as having an idealized or overly formal meaning.

[0068] The present invention has been described in detail above through specific embodiments and examples, but these are not intended to limit the invention. Many modifications and improvements can be made by those skilled in the art without departing from the principles of the invention, and these should also be considered within the scope of protection of the present invention.

Claims

1. A method for determining the design dimensions of a cable tray, characterized in that, include: Step S1: Perform a preliminary inspection of the physical parameters of the wiring, including at least the wire diameter and the ability to resist deformation under external force. Step S2: Set up multiple test boxes, and open wiring grooves of different sizes on each test box according to the wire diameter and the resistance to deformation under external force. Step S3: After assembling the wiring and the test box, test the sealing performance of the test box. The sealing performance includes at least waterproof and dustproof performance. Step S4: Obtain the sealing performance test results of each test box, wherein the test results include at least the waterproof performance test results and the dustproof performance test results; Step S5: Compare the sealing performance test results of each test box, and determine the design dimensions of the wiring trough based on the test results; In step S2, the specific method for opening wiring slots of different sizes on the test box is as follows: the width and depth of the wiring slot of one test box are equal to the wire diameter of the wiring object, and the other test boxes are divided into the first group of test boxes and the second group of test boxes. The depth of the wiring grooves in the first group of test boxes is equal to the diameter of the wiring material, and the width gradually changes towards being smaller than the diameter of the wiring material; The width of the wiring grooves in the second group of test boxes is equal to the wire diameter, and the depth gradually changes to be smaller than the wire diameter. The range of the gradual change towards a diameter smaller than that of the trace is adapted to the trace's resistance to deformation under external force.

2. The method for determining the design dimensions of a cable tray according to claim 1, characterized in that, In step S1, the ability of the wiring material to resist deformation under external force refers to the change in wire diameter of at least one cross-section of the wiring material under a preset clamping force.

3. The method for determining the design dimensions of a cable tray according to claim 1, characterized in that, In step S1, the ability of the wiring material to resist deformation under external force refers to the average value of the wire diameter variation of multiple cross sections of the wiring material under a preset clamping force.

4. The method for determining the design dimensions of a cable tray according to claim 1, characterized in that, In step S2, the wiring groove opened on the test box is a flat-bottomed groove or a round-bottomed groove.

5. The method for determining the design dimensions of a cable tray according to claim 1, characterized in that, The waterproof performance test result in step S4 refers to the measurement of the dyed area or color of the absorbent paper inside the test box.

6. The method for determining the design dimensions of a cable tray according to claim 1, characterized in that, The dustproof performance test result in step S4 refers to the measurement of the diamond powder introduced into the test box.

7. The method for determining the design dimensions of a cable tray according to claim 1, characterized in that, In step S3, during the waterproof performance test, the spray direction of the spray device is directed towards the junction of the test box and the wiring.

8. The method for determining the design dimensions of a cable tray according to claim 1, characterized in that, In step S3, when conducting the dustproof performance test, the dust emission direction of the dust emission device faces the junction between the test box and the wiring.

9. A test apparatus for determining the design dimensions of cable trays, characterized in that, Includes frame components and multiple test chambers; The frame assembly includes a frame, a cover plate, a partition, and a sealing ring, used for installing and fixing the test box body; The frame has mounting positions for fixing the test box; the partition is placed in the inner cavity of the frame, thereby dividing the inner cavity into several independent spaces for isolating different groups of test boxes; the cover is connected to the frame through the sealing ring and fixed by bolts. The test box includes a cable tray box and a cable tray cover plate, which are used to simulate the cooperation between the cable tray and the cable. The cable tray is opened on the cable tray box. Different sizes of wiring channels are made on the wiring channels of each test box. The specific method is as follows: The width and depth of the wiring groove in one test box are equal to the wire diameter. The other test boxes are divided into a first group of test boxes and a second group of test boxes. The depth of the wiring groove in the first group of test boxes is equal to the wire diameter, and the width gradually changes towards a direction smaller than the wire diameter. The width of the wiring groove in the second group of test boxes is equal to the wire diameter, and the depth gradually changes towards a direction smaller than the wire diameter. The range of the gradual change towards a direction smaller than the wire diameter is adapted to the resistance of the wiring to deformation under external force.

10. The experimental apparatus for determining the design dimensions of cable trays according to claim 9, characterized in that, The wiring channels on the test box are either flat-bottomed or rounded-corner channels.

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