Device for measuring friction force of cable buffer layer

Abstract

A cable buffer layer friction measuring device belongs to the field of power transmission cable friction detection. Which comprises a driving mechanism, a push head (22) is connected to the end part of the driving mechanism through a pressure sensor, the push head (22) is in contact with the cross section of a cable (13) to be detected, and a centering mechanism for placing the cable (13) to be detected is arranged, and is characterized in that the centering mechanism comprises two sliding seats (5) which move relatively; a plurality of clamping plates (6) used for clamping a cable (13) to be tested are arranged on the upper surfaces of the sliding seats (5) on the two sides, and the clamping plates (6) on the surfaces of the sliding seats (5) on the two sides are arranged in a staggered mode. In the friction force measuring device for the cable buffer layer, the to-be-measured cable is clamped on the surface of the centering mechanism through the mutually staggered clamping plates on the two sides, so that the centering performance of the to-be-measured cable is ensured, the axis of the to-be-measured cable is coaxial with the push head, the push head acts on the center of the to-be-measured cable, and the testing precision is improved.

Description

Technical Field

[0001] The invention discloses a cable buffer layer friction force measuring device, belonging to the field of power transmission cable friction force detection. Background Art

[0002] Transmission cables play a key role in urban power supply and economic development. High-voltage power cables generally use a semi-conductive buffer layer as a structural layer for the transition from the insulated core to the metal sheath and grounding. The semi-conductive buffer layer is generally wrapped with a semi-conductive buffer tape, and the tightness of the semi-conductive buffer layer with the metal sheath is one of the important manifestations of its reliability. During cable laying, the cable will be deformed when it is stretched from the bent state of the cable reel to the straight state on site, and the cable buffer layer will generate stress, which requires static friction of the cable buffer layer to offset the stress. Therefore, the friction of the cable buffer layer is an important indicator for measuring cable reliability.

[0003] The Chinese invention patent with application number 202010913019.0 and application date September 3, 2020, and patent name "A cable buffer layer friction measurement device and method" discloses a technical solution, in which the cable to be tested is placed on the surface of the cable fixing base, and after the cable is fixed by a wire clamp, the wire pressing block pushed by the electric push rod pushes the cable core. When the wire core is pushed out of the buffer layer, the thrust is tested by the sensor to obtain the friction value of the cable buffer layer. However, when the technical solution is implemented, it is found that there are still the following defects:

[0004] (1) In this technical solution, the cable to be tested is placed on the surface of the cable fixing base. Although the surface of the cable fixing base is provided with a "V"-shaped bayonet, it plays a role in centering the cable. The cable fixing base is composed of two fixed blocks spaced apart. This structure has a limited effect on the centering of the cable and can only ensure that the center line of the cable and the center line of the wire pressing block are on the same vertical plane. If the wire diameter of the cable to be tested is too large or too small, it is difficult to ensure that the wire pressing block can be directly aligned with the center of the cable, thus causing measurement deviation.

[0005] (2) When making samples of the cable to be tested, it is difficult to ensure that the cut surface is perpendicular to the axis of the cable when cutting the cable. If the inclination angle of the cut surface is large, the wire pressing block will not be able to fit the core of the cable when pushing, resulting in a deviation in the thrust, which will also affect the measurement results. Utility Model Content

[0006] The technical problem to be solved by the utility model is: to overcome the shortcomings of the prior art and provide a cable buffer layer friction force measuring device which can clamp the cable to be tested by means of mutually staggered clamping plates on both sides of the surface of the centering mechanism, thereby ensuring the centering of the cable to be tested and making the axis of the cable to be tested coaxial with the push head, so that the push head acts on the center of the cable to be tested, thereby improving the test accuracy.

[0007] The utility model solves the technical problem by adopting the following technical solution: the cable buffer layer friction force measuring device comprises a driving mechanism, a push head is connected to the end of the driving mechanism through a pressure sensor, the push head contacts the cross section of the cable to be tested, and a centering mechanism for placing the cable to be tested is provided, which is characterized in that the centering mechanism comprises two sliding seats that move relatively, a plurality of clamping plates for clamping the cable to be tested are provided on the upper surfaces of the sliding seats on both sides, and the clamping plates on the surfaces of the sliding seats on both sides are arranged in an alternating manner.

[0008] Preferably, a main frame is provided, a middle beam is provided above the main frame, two sets of guide rail mechanisms are fixed at intervals at the bottom of the middle beam, and two sliding seats are slidably connected to the guide rail mechanisms.

[0009] Preferably, a lead screw is installed between the two sets of guide rail mechanisms through a lead screw seat arranged at intervals, the surface of the lead screw is provided with two sections of threads in opposite directions, and the two sliding seats are respectively connected to the lead screw thread through the two sections of threads.

[0010] Preferably, a clamping groove is provided at the inner end surface of the clamping plate on the surfaces of the sliding seats on both sides.

[0011] Preferably, an outer fixed plate and an inner fixed plate are provided at both ends of the center beam, the driving mechanism is a servo electric cylinder, the piston rod of the servo electric cylinder passes through the inner fixed plate, the pressure sensor is installed at the end of the piston rod, and a push head seat is also installed on the surface of the pressure sensor, and the push head swing is set on the surface of the push head seat.

[0012] Preferably, a spherical groove is provided at the end of the push head seat, and the push head comprises a push plate, one end of the push plate contacts the cable to be tested, and the other end is provided with a ball head which is mounted in cooperation with the spherical groove.

[0013] Preferably, a through hole is opened on the surface of the outer fixing plate, and a group of sliding baffles are slidably arranged on both sides of the through hole, and the sliding baffles on both sides are slidably installed on the inner surface of the outer fixing plate.

[0014] Preferably, a test box is provided on the side of the main frame, the driving mechanism is installed in the test box, an operation area and a touch screen are provided on the upper surface of the test box, a controller is provided in the test box, multiple buttons, touch screens and pressure sensors in the operation area are respectively connected to the controller, and the controller is connected to the driving mechanism.

[0015] Preferably, a plurality of bottom wheels are also provided at the bottom of the main frame.

[0016] Compared with the prior art, the utility model has the following beneficial effects:

[0017] In the cable buffer layer friction force measuring device, the cable to be tested is clamped on the surface of the centering mechanism by means of mutually staggered clamping plates on both sides, which ensures the centering of the cable to be tested and can also make the axis of the cable to be tested coaxial with the push head, so that the push head acts on the center of the cable to be tested, thereby improving the test accuracy.

[0018] The push head is installed at the end of the push head seat through the ball head, which can be swung arbitrarily. Therefore, even if the cross section of the cable to be tested is inclined, it can fit the cross section of the cable to be tested, so that the push head and the cable to be tested can be reliably contacted, thereby improving the accuracy of measurement.

[0019] The bottom wheel is arranged at the bottom of the main frame, so that the flexibility of the cable buffer layer friction force measuring device during use is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 Axonometric diagram of the cable buffer layer friction measurement device.

[0021] Figure 2 This is a front view of the cable buffer layer friction measurement device.

[0022] Figure 3 for Figure 2 Rear view of.

[0023] Figure 4 for Figure 2 Top view of the .

[0024] Figure 5 for Figure 2 Right view of .

[0025] Wherein: 1, support seat 2, measuring base frame 3, guide rail mechanism 4, hand wheel 5, sliding seat 6, clamping plate 7, box base frame 8, box body 9, box door 10, touch screen 11, operation area 12, inner fixing plate 13, cable to be tested 14, top beam 15, outer fixing plate 16, sliding baffle 17, wheel frame 18, bottom wheel 19, guide rail fixing plate 20, middle beam 21, push head seat 22, push head 23, sliding plate 24, screw seat 25, connecting frame. DETAILED DESCRIPTION

[0026] Figures 1 to 5 It is the best embodiment of the utility model, and the following Figures 1 to 5 The utility model is further described.

[0027] like Figure 1As shown, a cable buffer layer friction force measuring device (hereinafter referred to as the measuring device) includes a test box, the test box includes a box bottom frame 7 and a box body 8 covered on the upper part of the box bottom frame 7, and a box door 9 is arranged on the front side of the box body 8. The control system of the measuring device is arranged in the box body 8, and the control system includes a controller and a servo electric cylinder controlled by the controller. An operating area 11 is also arranged on the upper surface of the box body 8. A plurality of buttons connected to the controller are arranged in the operating area 11, such as a start button, a stop button and an emergency stop button. A touch screen 10 is also arranged on the side of the operating area 11, and the touch screen 10 is also connected to the controller.

[0028] The measuring frame 2 is led out from the side of the box body 8 and fixed on the upper surface of the box frame 7. A wheel frame 17 is provided on the lower surface of the end of the measuring frame 2, and bottom wheels 18 are provided at the bottom of both ends of the wheel frame 17 and at the four corners of the bottom of the box frame 7. The mobile measurement of the measuring device is realized through three sets of bottom wheels 18.

[0029] Combination Figures 2~4 A support seat 1 is provided on both sides of the upper surface of the measuring chassis 2, an inner fixing plate 12 is vertically provided on the upper surface of the inner support seat 1, and an outer fixing plate 15 is vertically provided on the upper surface of the outer support seat 1, wherein the inner fixing plate 12 is embedded in the side wall of the box body 8. The lower parts of the inner fixing plate 12 and the outer fixing plate 15 are connected by a middle beam 20, and the tops of the inner fixing plate 12 and the outer fixing plate 15 are connected by a top beam 14, and two top beams 14 are arranged side by side.

[0030] The servo electric cylinder is fixed to the inner side of the inner fixing plate 12, and the piston rod of the servo electric cylinder passes through the inner fixing plate 12 and is led out from the side of the box body 8. A pressure sensor is arranged at the end of the piston rod of the servo electric cylinder, and a push head seat 21 is arranged at the end of the pressure sensor, and a push head 22 is installed at the end of the push head seat 21.

[0031] A spherical groove is provided at the end of the push head seat 21, and the push head 22 includes a push plate and a ball head mounted on the surface of the push plate. The push head 22 can be swung arbitrarily on the end of the push head seat 21 by means of the ball head and the spherical groove. The other end surface of the push plate of the push head 22 contacts the cable 13 to be tested. Since the push head 22 can swing arbitrarily, even if the cross section of the cable 13 to be tested is inclined, it can fit the cross section of the cable 13 to be tested, so that the push head 22 can reliably contact with the cable 13 to be tested, thereby improving the accuracy of measurement.

[0032] Two sets of guide rail mechanisms 3 are fixed at intervals at the bottom of the middle beam 20 through the guide rail fixing plate 19, and the two guide rail mechanisms 3 are perpendicular to the middle beam 20. The guide rail mechanism 3 is the same as the prior art, and includes a slide rail and a slider sliding along the slide rail. Connecting frames 25 are respectively provided at both ends of the two guide rail mechanisms 3, and the connecting frames 25 connect and fix the two slide rails in the corresponding side guide rail mechanisms 3. A groove is provided in the middle of the connecting frame 25, and a screw seat 24 is provided in the groove. A screw is rotatably installed in the front and rear screw seats 24. A handwheel 4 coaxially fixed with the screw is provided at the front end of the measuring device, and the screw is driven to rotate by the handwheel 4.

[0033] A sliding seat 5 is provided at the front and rear of the measuring device, respectively. The sliding seat 5 includes a top plate and sliding plates vertically fixed to the lower surfaces of both sides of the top plate. The sliding plates on both sides of the sliding seat 5 are respectively located outside the two guide rail mechanisms 3. Two sliders are slidably provided on the slide rails of each set of guide rail mechanisms 3, wherein the two sliders on the front side of the two sets of guide rail mechanisms 3 are respectively fixed to the sliding plates on both sides of the front sliding seat 5, and the two sliders on the rear side of the two sets of guide rail mechanisms 3 are respectively fixed to the sliding plates on both sides of the rear sliding seat 5.

[0034] Guide plates 23 are respectively arranged on the lower surfaces of the top plates of the two side sliding seats 5, and two sections of threads in opposite directions are provided at the front and rear ends of the lead screw, and the guide plates 23 on the lower surfaces of the two side sliding seats 5 are respectively connected to the lead screw threads through the two sections of threads. Therefore, when the lead screw is driven to rotate by the hand wheel 4, the sliding seats 5 at both ends move toward each other.

[0035] A plurality of clamping plates 6 are vertically fixed on the upper surfaces of the top plates of the sliding seats 5 on both sides. The clamping plates 6 on the front and rear sliding seats 5 are staggered front to back, and clamping grooves are provided on the inner end surfaces of the clamping plates 6 on the front and rear sliding seats 5 on both sides.

[0036] The specific working process and working principle are as follows:

[0037] First, turn the hand wheel 4 to drive the lead screw to rotate, so that the sliding seats 5 on both sides are separated, and a space is reserved for placing the cable 13 to be tested, and then the cable 13 to be tested is placed between the two top beams 14. Then turn the hand wheel 4 to drive the lead screw to rotate, so that the sliding seats 5 on both sides are close, and the cable 13 to be tested is gradually clamped by multiple clamping plates 6 on the upper part of the sliding seats 5 on both sides.

[0038] When the cable 13 to be tested is clamped, since the clamping plates 6 on both sides move toward each other and the clamping plates 6 on the front two sides are arranged alternately, the centering of the cable 13 to be tested can be ensured after the cable 13 to be tested is clamped. At the same time, by adjusting the cable 13 to be tested up and down, it can be ensured that the core at the center of the cable 13 to be tested can be coaxial with the push head 22 after being clamped.

[0039] Then the test is started through the operation area 11 and the touch screen 10. After the test starts, the controller controls the servo electric cylinder to move, and drives the push head seat 21 and the push head 22 through its piston rod to push the core of the cable to be tested 13, and gradually pushes the cable to be tested 13 to the side of the outer fixing plate 15.

[0040] Combination Figure 5 A through hole is also provided at the center of the outer fixing plate 15. After the cable 13 to be tested is clamped, the cable 13 to be tested is facing the through hole. Two sets of slide grooves are provided on the inner surface of the outer fixing plate 15. The two sets of slide grooves are respectively located on both sides of the through hole. A sliding baffle 16 is slidably provided in each of the two sets of slide grooves. Before starting the test, the positions of the sliding baffles 16 on both sides are manually adjusted so that the inner edges of the sliding baffles 16 on both sides are located on the inner side of the through hole and at the same time on the outer side of the core of the cable 13 to be tested.

[0041] After the test starts, after the push head 22 pushes the cable to be tested 13 to the outer fixed plate 15, the cable to be tested 13 is blocked by the sliding baffles 16 on both sides, and at the same time, the axial movement space of the core of the cable to be tested 13 is reserved. At this time, the measurement value of the pressure sensor installed at the piston rod of the servo electric cylinder gradually increases, and the signal output end of the pressure sensor is connected to the controller and displayed on the touch screen 10. After the core of the cable to be tested 13 is pushed out of the cable to be tested 13, the pressure value measured by the pressure sensor tends to be stable, and the current measurement value is the friction value of the cable buffer layer.

[0042] The above is only the preferred embodiment of the utility model, and does not limit the utility model in other forms. Any technician familiar with the profession may use the technical content disclosed above to change or modify it into an equivalent embodiment with equivalent changes. However, any simple modification, equivalent change and modification made to the above embodiment based on the technical essence of the utility model without departing from the technical solution of the utility model still belongs to the protection scope of the technical solution of the utility model.

Claims

1. A cable buffer layer friction force measuring device, comprising a driving mechanism, a push head (22) connected to the end of the driving mechanism via a pressure sensor, the push head (22) contacts the cross section of the cable (13) to be tested, and a centering mechanism for placing the cable (13) to be tested is provided, characterized in that: The centering mechanism comprises two sliding seats (5) that move relative to each other, and a plurality of clamping plates (6) for clamping the cable (13) to be tested are arranged on the upper surfaces of the sliding seats (5) on both sides, and the clamping plates (6) on the surfaces of the sliding seats (5) on both sides are arranged in a staggered manner.

2. The cable buffer layer friction force measuring device according to claim 1, characterized in that: A main frame is provided, a middle beam (20) is provided above the main frame, two sets of guide rail mechanisms (3) are fixed at intervals at the bottom of the middle beam (20), and two sliding seats (5) are slidably connected to the guide rail mechanisms (3).

3. The cable buffer layer friction force measuring device according to claim 2, characterized in that: A lead screw is installed between the two sets of guide rail mechanisms (3) via a lead screw seat (24) arranged at intervals, the surface of the lead screw is provided with two sections of threads in opposite directions, and the two sliding seats (5) are respectively connected to the lead screw thread through the two sections of threads.

4. The cable buffer layer friction force measuring device according to claim 1, characterized in that: A clamping groove is provided at the inner end surface of the clamping plate (6) on the surface of the sliding seats (5) on both sides.

5. The cable buffer layer friction force measuring device according to claim 2, characterized in that: An outer fixing plate (15) and an inner fixing plate (12) are arranged at both ends of the middle beam (20); the driving mechanism is a servo electric cylinder; a piston rod of the servo electric cylinder penetrates the inner fixing plate (12); a pressure sensor is mounted on the end of the piston rod; a push head seat (21) is also mounted on the surface of the pressure sensor; and a push head (22) is swingably arranged on the surface of the push head seat (21).

6. The cable buffer layer friction force measuring device according to claim 5, characterized in that: A spherical groove is formed at the end of the push head seat (21), and the push head (22) comprises a push plate, one end of which contacts the cable to be tested (13), and the other end of which is provided with a ball head which is mounted in cooperation with the spherical groove.

7. The cable buffer layer friction force measuring device according to claim 5, characterized in that: A through hole is opened on the surface of the outer fixing plate (15), and a group of sliding baffles (16) are slidably arranged on both sides of the through hole. The sliding baffles (16) on both sides are slidably installed on the inner surface of the outer fixing plate (15).

8. The cable buffer layer friction force measuring device according to claim 2, characterized in that: A test box is arranged on the side of the main frame, the drive mechanism is installed in the test box, an operation area (11) and a touch screen (10) are arranged on the upper surface of the test box, a controller is arranged in the test box, a plurality of buttons in the operation area (11), the touch screen (10) and the pressure sensor are respectively connected to the controller, and the controller is connected to the drive mechanism.

9. The cable buffer layer friction force measuring device according to claim 2, characterized in that: A plurality of bottom wheels (18) are also arranged at the bottom of the main frame.

Images