Circumferential Cutting Sample Preparation Device and Method for Cable Insulation Specimens

Abstract

The present invention discloses a device and method for cutting ring samples of cable insulation layers. The device includes a base, on which a driving device, a tool rest fixing seat, a first bracket and a second bracket are installed; on the tool rest fixing seat, a tool rest is installed, and an axial cutting tool is installed on the tool rest; on the first bracket, a first cable fixing seat is installed, and on the second bracket, a second cable fixing seat is installed; the first cable fixing seat and the second cable fixing seat are driven to rotate by a first driving device; clamping rods for clamping cables are installed on both the first cable fixing seat and the second cable fixing seat. The tool rest fixing base drives the blade to gradually approach the surface of the fixed cable sample. With the rotation of the cable sample and the uniform translation of the fixing base, the cable insulation layer sample is uniformly peeled, and a cable insulation layer sample piece with uniform thickness can be obtained, providing a good experimental basis for studying the aging of cable insulation layer materials.

Description

Technical Field

[0001] The present invention belongs to the technical field of power sample preparation, and particularly relates to a device and method for circumferential cutting of cable insulation layer samples. Background Art

[0002] After a high-voltage cable is put into operation, under the multiple effects of the operating environment, the insulating material will undergo a certain degree of aging, and ultimately insulation failure will lead to the occurrence of cable breakdown. The aging of the insulation layer occurs gradually from the outside to the inside. To study this phenomenon, when studying the actual environment-aged cable or the cable sample accelerated-aged in the laboratory, it is necessary to circumferentially cut the cable insulation layer material to study the sample pieces with a certain thickness and length.

[0003] In the current research on cutting cable insulation layer samples, traditional sample cutting methods are often used, that is, semi-automatic cutting is carried out by a lathe in a direction parallel to the cable axis. This cutting method is slow, requires a high level of human input, and cannot obtain a continuous overall section of the insulation layer. At the same time, since the sample preparation direction of the sample piece is not perpendicular to the cable radius direction, there will be a large difference in the aging degree of adjacent positions of the same sample piece, which affects the judgment of the aging degree of the insulating material in the experiment. Summary of the Invention

[0004] The present invention aims to provide a device and method for circumferential cutting of cable insulation layer samples to automatically strip the cable insulation layer with equal thickness along the circumferential direction and obtain an overall sample of the entire insulation layer for the aging analysis experiment of the cable insulation layer material.

[0005] To achieve the above object, the circumferential cutting sample preparation device for the cable insulation layer of the present invention includes a base, on which a driving device, a tool rest fixing seat, a first bracket and a second bracket are installed; a tool rest is installed on the tool rest fixing seat, and an axial cutting tool is installed on the tool rest; a first cable fixing seat is installed on the first bracket, and a second cable fixing seat is installed on the second bracket; the first cable fixing seat and the second cable fixing seat are driven to rotate by a first driving device; clamping rods for clamping the cable are installed on both the first cable fixing seat and the second cable fixing seat.

[0006] Further, the first driving device is a dual-output motor. The first end of its power output shaft is connected to the lower part of the first transmission device through a spline shaft, and a first cable fixing seat is installed on the upper part of the first transmission device; the power output shaft of the first motor is connected to the first transmission shaft through a gear set. The first end of the first transmission shaft is a spline shaft, on which the first transmission device is installed, and the second end is connected to the lower part of the second transmission device, and a second cable fixing seat is installed on the upper part of the second transmission device; the first transmission device includes a first belt transmission device. The driving wheel of the first belt transmission device is installed on the spline shaft, and the driven wheel is connected to the first cable fixing seat through the second transmission shaft. The second transmission shaft is installed on the upper part of the first bracket through a bearing; the second transmission device has the same structure and size as the first transmission device.

[0007] Further, the tool rest fixing seat is in screw transmission connection with the lead screw, and a second driving device for driving its rotation is installed at one end of the lead screw.

[0008] Further, the lead screw is a left-right hand screw. One side of the lead screw is a left-handed thread, and the other side is a right-handed thread; the tool rest fixing seat is in screw thread transmission connection with the left-handed thread; the right-handed thread is in transmission connection with the roller mounting seat; a roller is arranged at the top of the roller mounting seat.

[0009] Further, guide rails are arranged on both sides of the lead screw, and both the tool rest fixing seat and the roller mounting seat are slidably connected to the guide rails.

[0010] Further, a rocker for driving its rotation is installed at the other end of the lead screw.

[0011] Further, the first bracket is slidably connected to the sliding track.

[0012] Further, a lamp is installed on the upper part of the base.

[0013] Based on the above-mentioned sample preparation method of the cable insulation layer sample cutting device, it is characterized in that it includes the following steps:

[0014] Step 1: Clamp both ends of the cable sample with the first cable fixing seat and the second cable fixing seat respectively;

[0015] Step 2: Adjust the cutting edge of the axial cutter so that it is parallel to the axis of the cable insulation layer sample;

[0016] Step 3: Drive the first cable fixing seat and the second cable fixing seat to rotate, so as to drive the cable sample to rotate; at the same time, drive the axial cutter to translate towards the cable sample. When the axial cutter touches the insulation layer of the cable sample, start to cut the cable insulation layer in a circular shape. When the required length of the insulation layer sample is cut, stop the axial cutter from feeding, stop the first cable fixing seat from rotating, and drive the axial cutter to reset.

[0017] Furthermore, the translation speed of the axial cutter and the angular velocity of the cable fixing seat are adjusted to obtain cable insulation layer samples of different thicknesses and lengths.

[0018] Compared with the prior art, the present invention has at least the following beneficial technical effects:

[0019] The device described in the present invention is used for automatically stripping and sampling the cable insulation layer. The fixed base of the knife holder drives the blade to gradually approach the surface of the fixed cable sample. With the rotation of the cable sample and the uniform translation of the fixed base, the cable insulation layer sample is stripped with uniform thickness, and both the stripping thickness and the stripping speed can be controlled. Thus, a cable insulation layer sample with uniform thickness can be obtained, which provides a good experimental basis for studying the aging of the cable insulation layer material.

[0020] Furthermore, the equipment can independently perform insulation stripping during the entire sample preparation process to complete sample preparation, thereby realizing the automation of cable insulation stripping and improving sample preparation efficiency.

[0021] Furthermore, the screw rod is a forward and reverse screw rod, and tool holders are installed on both sides of the forward and reverse screw rods for fixing and transmission connection with a roller mounting seat; a roller is arranged on the roller mounting seat, and the cut insulation layer sample can be wound around the roller.

[0022] Furthermore, guide rails are arranged on both sides of the screw rod, and the knife holder fixing seat and the roller mounting seat are slidably connected to the guide rails to ensure the forward direction of the cutter.

[0023] Furthermore, while the motor-driven device can be used for exploitation, a rocker device is also configured to manually adjust the position of the tool holder, saving the cost of intelligent adjustment equipment.

[0024] Furthermore, the first bracket is slidably connected to the sliding track, so that the moving direction of the first bracket can be limited.

[0025] Furthermore, a light is installed on the upper part of the base to provide illumination during the sample preparation process, making it easier for staff to observe the progress of the sample preparation.

[0026] Furthermore, in the device described in the present invention, after the operator starts to use, the only things that the operator needs to touch are the control box shell and the joystick. While protecting the core components of the equipment, it prevents people from directly touching the cutting tool or the running motor when preparing samples, thereby reducing personal safety hazards. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 A three-dimensional diagram of the automatic cutting device for cable insulation layer provided by the present invention;

[0028] Figure 2 A front view of the automatic cable insulation stripping device provided by the present invention;

[0029] Figure 3 Top view of the automatic cable insulation stripping device provided by the present invention;

[0030] Figure 4 Side view of the automatic cable insulation stripping device provided by the present invention.

[0031] In the drawings: 1, base; 2, sliding track; 3, control box; 4, tool rest fixing seat; 5, first cable fixing seat; 6, second cable fixing seat; 7, axial cutting tool; 8, tool rest; 9, floor bolt; 10, first bracket; 11, rocker; 12, lead screw; 13, first clamping rod; 14, second clamping rod; 15 - roller; 16 - second bracket; 17 - lamp; 18, first motor; 19, second motor; 20, roller mounting seat; 21, spline shaft; 22, first belt drive; 23, gear set; 24, first transmission shaft; 25, second belt drive; 26, guide rail seat; 27, locking device. Detailed implementation manners

[0032] In order to make the objectives and technical solutions of the present invention clearer and easier to understand, the present invention will be further described in detail below with reference to the drawings and embodiments. The specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0033] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present invention 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 thus should not be construed as limiting the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, the meaning of "a plurality" is two or more. In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, the terms "mounted", "connected" and "connected" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] Embodiment 1

[0035] Refer to Figures 1 to 4 Figures 1 to 4 , an automatic circumferential cutting and sample preparation device for cable insulation layer samples, which is used for circumferentially cutting and preparing samples of cable insulation layer, including a base 1, a sliding track 2, a control box 3, a tool rest fixing seat 4, a first cable fixing seat 5, a second cable fixing seat 6, an axial cutting tool 7, a tool rest 8, a floor bolt 9, a first bracket 10, a rocker 11, a lead screw 12, a first clamping rod 13 and a second clamping rod 14.

[0036] The sliding track 2, the control box 3, the tool rest fixing seat 4, the first cable fixing seat 5, the second cable fixing seat 6, the axial cutting tool 7, the tool rest 8, the floor bolt 9, the first bracket 10, the rocker 11, the lead screw 12, the first clamping rod 13 and the second clamping rod 14 are all installed on the base 1, and the floor bolt 9 is installed at the bottom of the base 1.

[0037] The base 1 includes a mounting plate and legs. The control box 3, the sliding track 2 and a guide rail seat 26 are installed on the mounting plate. The first bracket 10 is slidably installed on the sliding track 2; a locking device 27 is installed on one side of the first bracket 10. The locking device 27 includes a positive and reverse lead screw. A clamping block is installed on each of the positive thread part and the reverse thread part. The two clamping blocks are respectively located on both sides of a sliding track 2. One end of the positive and reverse lead screw is installed with a rocker. When the position of the first bracket 10 needs to be adjusted, rotate the rocker counterclockwise, and the positive and reverse lead screw drives the clamping blocks to move away from each other, so that the two clamping blocks loosen the sliding track 2, and the first bracket 10 can slide on the sliding track 2. When sample preparation is carried out, when the rocker is rotated clockwise, the positive and reverse lead screw drives the clamping blocks to move towards each other, so that the two clamping blocks clamp the sliding track 2, and the first bracket 10 and the sliding track 2 are locked. The two sides of the guide rail seat 26 are guide rails. A lead screw 12 is arranged between the two guide rails. The tool rest fixing seat 4 and a roller mounting seat 20 are installed on the lead screw 12. Both the tool rest fixing seat 4 and the roller mounting seat 20 are slidably connected with the guide rails. The lead screw 12 is a positive and reverse lead screw. One side of the lead screw 12 is a left-handed thread, and the other side is a right-handed thread; the tool rest fixing seat 4 is in threaded transmission connection with the left-handed thread; the roller mounting seat 20 is in threaded transmission connection with the right-handed thread. When the lead screw 12 rotates, the tool rest fixing seat 4 and the mounting seat 20 move towards each other or away from each other. The moving directions of the tool rest fixing seat 4 and the roller mounting seat 20 are perpendicular to the extending direction of the sliding track 2. The tool rest 8 is fixed on the tool rest fixing seat 4. An axial cutting tool 7 is installed on the upper part of the tool rest 8. The cutting edge direction of the axial cutting tool 7 is obliquely upward at 45°. A tool groove is arranged on the tool rest 8 for fixing the axial cutting tool 7, and it can be disassembled by fixing screws; the axial cutting tool 7 is fixed in the tool groove with screws, and the cutting edge direction of the axial cutting tool 7 is parallel to the direction of the cable fixing shaft.

[0038] A roller 15 for winding the insulation layer sample is installed on the roller mounting seat 20.

[0039] One end of the lead screw 12 is equipped with a rocker 11, and the other end is equipped with a second motor 19. The rocker 11 and the second motor 19 are used to drive the lead screw 12 to rotate.

[0040] Referring to Figure 4 , a first motor 18 is installed below the mounting plate. A first gear is installed on the power output shaft of the first motor 18. The first gear meshes with a second gear. The tooth ratio of the first gear to the second gear is 1:1. The first gear and the second gear form a gear set 23. A first transmission shaft 24 is installed at the center of the second gear. The second gear is used to drive the first transmission shaft 24 to rotate;

[0041] The first end of the first transmission shaft 24 is a spline shaft 21. The spline shaft 21 is connected to the lower part of the first transmission device. A first cable fixing seat 5 is installed on the upper part of the first transmission device; the first transmission device can move horizontally along the spline shaft 21. The second end of the first transmission shaft 24 is connected to the lower part of the second transmission device. A second cable fixing seat 6 is installed on the upper part of the second transmission device; both the first cable fixing seat 5 and the second cable fixing seat 6 are three-jaw chucks. Three first clamping rods 13 with an included angle of 120 degrees are installed on the first cable fixing seat 5. The spacing of the three first clamping rods 13 can be adjusted to clamp cable specimens with different radii; three second clamping rods 14 with an included angle of 120 degrees are installed on the second cable fixing seat 6. The spacing of the three second clamping rods 14 can be adjusted to clamp cable specimens with different radii or clamp or loosen the cable. When the first motor 18 is started, the first cable fixing seat 5 is driven to rotate through the first transmission device; the second cable fixing seat 6 is driven to rotate through the second transmission device.

[0042] The first transmission device includes a first bracket 10 and a first belt transmission device 22. The spline shaft 21 is connected to the lower part of the first bracket 10 through a bearing. The driving wheel of the first belt transmission device 22 is installed on the spline shaft 21. The driven wheel is connected to the first cable fixing seat 5 through a second transmission shaft. The second transmission shaft is installed on the upper part of the first bracket 10 through a bearing.

[0043] The second transmission device has the same structure and size as the first transmission device. The second transmission device includes a second bracket 16 and a second belt transmission device 25. The driving wheel of the second belt transmission device 25 is connected to the first transmission shaft 24. The driven wheel is connected to the second cable fixing seat 6 through a third transmission shaft. The third transmission shaft is installed on the upper part of the second bracket 16 through a bearing.

[0044] When making samples, the first cable fixing base 5 and the second cable fixing base 6 clamp the cable. The second cable fixing base 6 cannot move horizontally and can only rotate on the bearing; the first cable fixing base 5 is fixed on the first bracket 10, and the first bracket 10 can move along the direction of the sliding track 2. The first cable fixing base 5 is driven by the first bracket 10 to move along the sliding track 2, so as to adjust the distance between the two cable fixing bases. After adjusting the distance, the first bracket 10 and the sliding track 2 are locked by the locking device.

[0045] The first motor 18 can control the first cable fixing base 5 to rotate at a constant speed, and the rotation speed is divided into 3 gears; the second motor 19 is used to provide power for the tool rest fixing base 4 and can control its uniform movement, and the moving speed is divided into 3 gears.

[0046] In its side view, the position of the axial cutting tool 7 does not coincide with the cable fixing shaft, and the axial cutting tool 7 only peels the cable sample exceeding the cable fixing shaft part.

[0047] A lamp 17 for lighting is installed on the control box 3. A power switch, an emergency stop switch and a start / stop switch are arranged on the outer side wall of the control box 3. These switches are all connected to the PLC and are used to control the operating states of the first motor and the second motor. The PLC controls the first motor and the second motor through the driver, and the PLC can control the rotation speed gear of the first cable fixing base 5 and the moving speed gear of the tool rest fixing base 4 through the driver.

[0048] The base 1 is the base of the whole equipment. The base 1 is supported by a plurality of anchor bolts 9, and the height of the anchor bolts 9 is adjustable so as to level the equipment after transportation.

[0049] Embodiment 2

[0050] An automatic circumferential cutting method for cable insulation layer samples includes the following steps:

[0051] The fixed base moves towards the cable axis at a certain speed, and the cutting edge of the blade contacts the surface of the cable insulation layer sample and peels along its circumferential direction to obtain a sample slice. The rotation speed of the rotating shaft and the moving speed of the fixed base can be adjusted.

[0052] Step 1: Adjust the distance between the first cable fixing base 5 and the second cable fixing base 6 to ensure that the cable sample can be placed.

[0053] Step 2: Place one end of the cable sample between the three first cable clamping rods 13, and adjust the spacing of the clamping rods 13 by screws to make the cable fit tightly with it.

[0054] Step 3: Adjust the distance between the first cable fixing base 5 and the second cable fixing base 6 through the rocker or control switch so that it can just clamp the cable sample, and adjust the second clamping rod 14 to clamp the cable sample.

[0055] Step 4: Install the axial cutting tool 7 in the tool slot on the tool rest 8, and make the cutting edge of the axial cutting tool 7 tangent to the cable insulation sample; adjust the height of the tool rest 8 by adjusting the screws so that the axial cutting tool 7 can strip the cable sample.

[0056] Step 5: Start the first motor 18 to drive the first cable fixing seat 5 and the second cable fixing seat 6 to rotate synchronously, driving the cable sample to rotate. At this time, the second motor drives the axial cutting tool 7 to move towards the cable sample. When the axial cutting tool 7 contacts the insulation layer of the cable sample, it starts to perform a circumferential cut on the cable insulation layer and maintains a uniform feed, cutting out a continuous insulation layer sample. Wind the insulation layer sample around the drum 15. When the required thickness and length of the insulation layer sample are cut, stop the feed of the axial cutting tool 7, stop the rotation of the first cable fixing seat 5, and drive the axial cutting tool 7 to reset.

[0057] The feed speed V2 of the axial cutting tool 7 = N1 × f, where N1 is the rotation speed of the first cable fixing seat 5; f is the feed amount, that is, the cutting thickness.

[0058] The rotation speed V1 of the first motor = N1 ÷ i, where i is the transmission ratio between the first motor and the first cable fixing seat 5.

[0059] The rotation time t of the second motor = D ÷ f, where D is the insulation layer thickness.

[0060] Step 6: Adjust the parallel movement speed of the axial cutting tool 7 and the angular velocity of the rotation of the first cable fixing seat 5, and repeat the above steps to obtain cable insulation layer samples with different thicknesses and lengths.

[0061] The above content is only to illustrate the technical idea of the present invention and cannot be used to limit the protection scope of the present invention. Any modification made on the basis of the technical solution according to the technical idea proposed by the present invention falls within the protection scope of the claims of the present invention.

Claims

1. Cable insulation layer sample circumferential cutting and sample preparation device, characterized in that It includes a base (1), on which a driving device, a tool rest fixing seat (4), a first bracket (10) and a second bracket (16) are installed; a tool rest (8) is installed on the tool rest fixing seat (4), and an axial cutting tool (7) is installed on the tool rest (8); a first cable fixing seat (5) is installed on the first bracket (10), and a second cable fixing seat (6) is installed on the second bracket (16); the first cable fixing seat (5) and the second cable fixing seat (6) are driven to rotate by a first driving device. Clamping rods for clamping cables are installed on both the first cable fixing seat (5) and the second cable fixing seat (6). The first driving device is a double-output motor. The first end of its power output shaft is connected to the lower part of a first transmission device through a spline shaft (21), and a first cable fixing seat (5) is installed on the upper part of the first transmission device; the power output shaft of a first motor (18) is connected to a first transmission shaft (24) through a gear set (23). The first end of the first transmission shaft (24) is a spline shaft, on which the first transmission device is installed, and the second end is connected to the lower part of a second transmission device. A second cable fixing seat (6) is installed on the upper part of the second transmission device. The first transmission device includes a first belt transmission device (22). The driving wheel of the first belt transmission device (22) is installed on the spline shaft (21), and the driven wheel is connected to the first cable fixing seat (5) through a second transmission shaft. The second transmission shaft is installed on the upper part of the first bracket (10) through a bearing; the second transmission device has the same structure and size as the first transmission device. The tool rest fixing seat (4) is in transmission connection with a lead screw (12), and a second driving device for driving its rotation is installed at one end of the lead screw (12). The lead screw (12) is a left-right hand lead screw. One side of the lead screw has a left-handed thread, and the other side has a right-handed thread; the tool rest fixing seat (4) is in threaded transmission connection with the left-handed thread; the right-handed thread is in transmission connection with a drum mounting seat (20); a drum (15) is arranged at the top of the drum mounting seat (20), and the cut insulating layer sample is wound on the drum (15).

2. The cable insulation layer sample circumferential cutting and sample preparation device according to claim 1, wherein, Guide rails are arranged on both sides of the lead screw (12), and both the tool rest fixing seat (4) and the drum mounting seat (20) are slidably connected to the guide rails.

3. The cable insulation layer sample circumferential cutting and sample preparation device according to claim 1, characterized in that A rocker (11) for driving the rotation of the lead screw (12) is installed at the other end of the lead screw (12).

4. The cable insulation layer sample circumferential cutting and sample preparation device according to claim 1, characterized in that, The first bracket (10) is slidably connected to a sliding track (2).

5. The cable insulation layer sample circumferential cutting and sample preparation device according to claim 1, characterized in that A lamp (17) is installed on the upper part of the base (1).

6. The sample preparation method of the cable insulation layer sample cutting device according to claim 1, characterized in that, It includes the following steps: Step 1: Clamp both ends of the cable sample with the first cable fixing seat (5) and the second cable fixing seat (6) respectively. Step 2: Adjust the cutting edge of the axial cutting tool (7) to be parallel to the axis of the cable insulating layer sample. Step 3: Drive the first cable fixing seat (5) and the second cable fixing seat (6) to rotate, so as to drive the cable sample to rotate; at the same time, drive the axial cutter (7) to translate towards the cable sample. When the axial cutter (7) contacts the insulating layer of the cable sample, start to circumferentially cut the cable insulating layer. When the required length of the insulating layer specimen is obtained by cutting, stop the axial cutter (7) from feeding, stop the first cable fixing seat (5) from rotating, and drive the axial cutter (7) to reset.

7. The sample preparation method according to claim 6, characterized in that, By adjusting the translation speed of the axial cutter (7) and the angular velocity of the cable fixing seat (5) rotating, cable insulating layer specimens with different thicknesses and lengths can be obtained.

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