A low-voltage cable insulation detection mechanism

Abstract

The application relates to the technical field of cable insulation detection, and mainly relates to a low-voltage cable insulation detection mechanism which comprises two fixed plates, a movable plate rotatably installed on the fixed plates, a clamping piece, openings in the fixed plates and the movable plate, and a moving plate slidably installed in the openings. Resetting pieces are installed on the moving plate and abut against the openings. Adjacent ends of the two moving plates are fixed with linkage plates. A plurality of conductive spring needles are evenly distributed in a single row on the bottom of the arc-shaped elastic plate and can be wrapped outside the low-voltage cable. The moving plate can slide in the opening, and the conductive spring needles can rotate around the outside of the low-voltage cable. The single-row arrangement of the conductive spring needles reduces the friction when the cable is contacted, the cable is more easily pulled, and the phenomenon that the conductive spring needles are deviated during the pulling process is avoided.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of cable insulation detection, in particular to a low-voltage cable insulation detection mechanism. BACKGROUND

[0002] Low-voltage cable refers to a cable used for transmitting low-voltage electric energy, mainly used in the power distribution link of a power system, and connected with low-voltage power distribution cabinets, power distribution boxes and electric equipment, and is one of the most common cable types in industrial, construction and civil fields.

[0003] Pipe gallery cable used for power supply of lighting, monitoring equipment, fans, water pumps and other low-voltage electrical equipment in a pipe gallery belongs to low-voltage cable. In the production process of the low-voltage cable, multiple processes are needed, involving conductor processing, insulation extrusion, sheath coating, quality detection and other links. In the last detection link, the insulation performance needs to be detected. If the detection result proves that the cable has no leakage, the cable can be put into use. The existing authorized Chinese patent document CN202321567154.X proposes a cross-linked cable insulation layer detection device. If the outer layer of the cable is broken, the conductive spring needle will be connected, at which time the insulation is unqualified, otherwise the insulation is qualified, so that the result of whether the insulation is qualified can be known. However, in the scheme, a large number of conductive spring needles are designed. In the use process, the contact points are more, resulting in large friction force of the cable during pulling, which is not easy to pull. In the pulling process, the large friction force of the cable may drive part of the conductive spring needles to be skewed, causing a gap between the contact of the cable insulation layer, affecting the detection result. SUMMARY

[0004] The purpose of the present application is to provide a low-voltage cable insulation detection mechanism to solve the problem of large contact friction caused by a large number of conductive spring needles during cable insulation detection in the background art.

[0005] To achieve the above purpose, the present application provides the following technical scheme: a low-voltage cable insulation detection mechanism, comprising two fixed plates, the fixed plates are rotatably installed with movable plates, further comprising clamping pieces, the fixed plates and the movable plates are clamped on the outside of the low-voltage cable through the clamping pieces, openings are formed in the fixed plates and the movable plates, and movable plates are slidably installed in the openings, reset pieces are installed on the movable plates and abut against the openings, adjacent ends of the two movable plates are fixed with linkage plates, an installation cavity is formed in the fixed plate, a driving part for moving the linkage plates is installed in the installation cavity, a cable detection part is installed on the adjacent two movable plates, the cable insulation is detected through the cable detection part, and a wiping part is installed on the other two movable plates, and the foreign matter on the outside of the cable is wiped through the wiping part.

[0006] Preferably, the cable detection part comprises an insertion rod slidingly inserted on the moving plate, the top of the insertion rod is fixed with a butt cylinder, the bottom is fixed with an arc-shaped elastic plate, the bottom of the arc-shaped elastic plate is uniformly distributed with a plurality of conductive spring pins, the outer side of the insertion rod is sleeved with a pushing spring pushing the arc-shaped elastic plate downward, a connecting plate is installed between the two fixed plates, a placing frame is arranged on the connecting plate, and a detection instrument is placed in the placing frame.

[0007] Preferably, the reset part comprises an arc-shaped sliding rod fixed in the opening, the arc-shaped sliding rod is slidingly inserted with the moving plate, and the outer side of the arc-shaped sliding rod is sleeved with an arc-shaped spring abutting against the moving plate and the inner wall of the opening, the moving plate is pushed by the two arc-shaped springs, so that the two linkage plates abut against each other.

[0008] Preferably, the two adjacent linkage plates are arc-shaped, the two linkage plates are attached to the inner sides of the fixed plate and the movable plate, and the adjacent ends of the two linkage plates are fixed with end blocks.

[0009] Preferably, the connecting plate is fixed with a supporting plate for supporting the detection instrument.

[0010] Preferably, the clamping part comprises an arc-shaped connecting rod fixed on the movable plate, one end of the arc-shaped connecting rod is slidingly inserted with the fixed plate, and the outer side of the arc-shaped connecting rod is sleeved with a clamping spring abutting against the fixed plate.

[0011] Preferably, the driving part comprises a double-shaft motor fixed on the bottom of the connecting plate through a motor bracket, the output end of the double-shaft motor is fixed with a driving rod, the driving rod is rotatably extended into the installation cavity and fixed with a half gear, and one of the linkage plates is provided with a tooth groove meshing with the half gear.

[0012] Preferably, the two fixed plates are fixed with connecting rods, and the two movable plates are fixed with adjusting plates.

[0013] Preferably, the wiping part comprises two sliding rods slidingly inserted on the moving plate, the top of the sliding rod is fixed with a limiting ball, the bottom is fixed with an end plate, the outer side of the sliding rod is sleeved with a pressing spring driving the end plate towards the cable, and the outer side of the end plate is installed with a fitting part abutting against the outer side of the cable.

[0014] Preferably, the fitting part comprises an elastic plate, the elastic plate is fixed with a track plate, the bottom of the end plate is fixed with a butt rod abutting against the track plate, and the outer side of the elastic plate is sleeved with a wiping sleeve.

[0015] Compared with the prior art, the present application has the following advantages:

[0016] The present application is fixed on the outside of the low-voltage cable by the fixed plate and the movable plate, the cable detection part on the movable plate is designed to contact the insulating layer on the outside of the low-voltage cable, and the detection instrument can judge whether the insulating performance of the low-voltage cable meets the standard, and the driving part and the reset part are matched with each other to drive the movable plate to move in the opening, and the cable is pulled to realize the overall contact on the outside of the low-voltage cable.

[0017] The plurality of conductive spring pins are evenly distributed in a single row at the bottom of the arc-shaped elastic plate, can be wrapped on the outside of the low-voltage cable, and the movable plate is matched with the sliding in the opening, can realize rotating around the outside of the low-voltage cable, the single row of conductive spring pins reduces the friction when contacting the cable, makes the cable more easy to pull, and avoids the phenomenon of driving the conductive spring pins to be inclined during the pulling process.

[0018] The wiping part designed in the present application can wipe the cable area to be detected, clean the residual sundries on the outside of the insulating layer, and improve the detection accuracy. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is a whole and low-voltage cable buckling structure diagram of the present application;

[0020] Figure 2 It is another angle structure diagram of the whole of the present application;

[0021] Figure 3 It is a front view of the present application after the whole and low-voltage cable buckling;

[0022] Figure 4 It is a position relation diagram of the cable detection part and the wiping part of the present application;

[0023] Figure 5 It is a butt joint diagram of the driving part and the wiping part of the present application;

[0024] Figure 6 It is a wiping part structure diagram of the present application;

[0025] Figure 7 It is Figure 6 It is an enlarged view of A in the present application;

[0026] Figure 8 It is a front view of the fixed plate of the present application;

[0027] Figure 9 It is a structure diagram of the fixed plate and the movable plate of the present application in the open state.

[0028] In the figure: 1. fixed plate; 2. movable plate; 3. clamping part; 4. opening; 5. movable plate; 6. reset part; 7. linkage plate; 8. installation cavity; 9. driving part; 10. cable detection part; 11. wiping part; 12. insertion rod; 13. docking tube; 14. arc spring plate; 15. conductive spring needle; 16. push spring; 17. connecting plate; 18. placement frame; 19. detection instrument; 20. arc slide bar; 21. arc spring; 22. support plate; 23. arc connecting rod; 24. clamping spring; 25. dual-axis motor; 26. driving rod; 27. half gear; 28. tooth groove; 29. ​​connecting rod; 30. adjustment plate; 31. sliding rod; 32. limit ball; 33. end plate; 34. extrusion spring; 35. fitting part; 36. elastic plate; 37. track plate; 38. docking rod; 39. wiping sleeve. DETAILED DESCRIPTION

[0029] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0030] Example 1: Please refer to Figure 1 - Figure 6 , a low-voltage cable insulation detection mechanism shown in the figure includes two fixed plates 1, a movable plate 2 is rotatably mounted on the fixed plate 1, and also includes a clamping member 3, by which the fixed plate 1 and the movable plate 2 are clamped on the outside of the low-voltage cable, an opening 4 is provided on the fixed plate 1 and the movable plate 2, and a movable plate 5 slidably mounted in the opening 4, a reset member 6 is mounted on the movable plate 5, and a linkage plate 7 is fixed to the adjacent ends of the two movable plates 5, a mounting cavity 8 is provided in the fixed plate 1, a driving part 9 for driving the linkage plate 7 to move is mounted in the mounting cavity 8, and a cable detection part 10 is mounted on the two adjacent movable plates 5, the insulation of the low-voltage cable is detected by the cable detection part, and a wiping part 11 is mounted on the other two movable plates 5, and the debris on the outside of the cable is wiped off by the wiping part 11;

[0031] In this solution, the fixed plate 1, the movable plate 2 and the clamping member 3 are designed to cooperate with each other to achieve buckling on the outside of the low-voltage cable, and the cable detection unit 10 is used to detect the insulation layer on the outside of the cable to determine whether it is insulated. During the movement, the wiping unit 11 is used to wipe the area to be tested in advance, effectively preventing the insulation layer attachment from affecting the test results, making the test more accurate.

[0032] It also needs to be explained that: the reset member 6 and the driving part 9 drive the moving plate 5 to move in the opening 4, so that the detection part can be attached to the outside of the cable, without being wrapped around the outside of the cable, so that the cable has small friction when pulling and is smooth to pull.

[0033] Further, referring to Figure 2 Figure 4 And Figure 8 And Figure 9 The cable detection part 10 includes a plug rod 12 slidingly inserted into the moving plate 5, the top of the plug rod 12 is fixed with a docking barrel 13, the bottom is fixed with an arc-shaped elastic plate 14, the bottom of the arc-shaped elastic plate 14 is installed with a plurality of conductive spring pins 15, the outside of the plug rod 12 is sleeved with a push spring 16 that pushes the arc-shaped elastic plate 14 downward, the two fixed plates 1 are installed with a connecting plate 17, the connecting plate 17 is provided with a placing frame 18, and the placing frame 18 is installed with a detection instrument 19, wherein the docking barrel 13, the plug rod 12, the arc-shaped elastic plate 14 and the conductive spring pins 15 are all made of metal materials and are in mutual conduction.

[0034] In the scheme, the detection instrument 19 can be a multimeter, two lead wires on the multimeter are inserted into the docking barrel 13, after the two docking barrels 13 are docked, the conductive spring pins 15 are attached to the outside of the cable insulation layer, then the multimeter adjusts the voltage to be high to obtain the reading change of the multimeter at different positions of the cable, so as to judge the leakage of the cable to be detected by the multimeter, and the leakage position can be accurately obtained to facilitate the maintenance and reuse of the cable to be detected.

[0035] It should be noted that the docking barrel 13, the plug rod 12 and the arc-shaped elastic plate 14 are in mutual conduction, so that after the two lead wires on the multimeter are inserted into the docking barrel 13, the conductive spring pins 15 can be used to judge the insulation when they are attached to the outside of the cable, wherein the push spring 16 pushes the arc-shaped elastic plate 14 close to the cable, the arc-shaped elastic plate 14 has a tendency to bend inward at both ends, so that it can be stably wrapped outside the cable. When wrapped outside the cable, the arc-shaped elastic plate 14 changes from "U" type to "C" type after wrapping, so that the arc-shaped elastic plate 14 can be well attached to the outside of the cable, and can be elastically bent according to the diameter of the cable to meet the detection needs of cables of different diameters, so that the cable detection flexibility is high.

[0036] Further, referring to Figure 8 The reset member 6 includes an arc-shaped slide rod 20 fixed in the opening 4, the arc-shaped slide rod 20 is slidingly inserted into the moving plate 5, the outside of the arc-shaped slide rod 20 is sleeved with an arc-shaped spring 21 abutting against the moving plate 5 and the inner wall of the opening 4, the two arc-shaped springs 21 push the moving plate 5 so that the two linkage plates 7 abut against each other.

[0037] ​In the scheme, the arc-shaped springs 21 in the two reset members 6 push the moving plates 5 to move in the openings 4, the arc-shaped springs 21 in the two adjacent reset members 6 are located at different outer ends of the two moving plates 5, and under the joint action of the two arc-shaped springs 21, the adjacent linkage plates 7 of the two moving plates 5 abut against each other, the movement of one moving plate 5 can drive the two moving plates 5 to slide synchronously in the openings 4, thereby driving the arc-shaped elastic plates 14 to rotate outside the cable, and the detection range is improved.

[0038] It should be further pointed out that the two adjacent linkage plates 7 are arc-shaped, the two linkage plates 7 are attached to the inner sides of the fixed plate 1 and the movable plate 2, and end blocks are fixed to the adjacent ends of the two linkage plates 7, so that the two linkage plates 7 can abut against each other stably.

[0039] Further, referring to Figure 3 and Figure 8 , the clamping member 3 includes an arc-shaped connecting rod 23 fixed to the movable plate 2, one end of the arc-shaped connecting rod 23 is slidably inserted into the fixed plate 1, and the arc-shaped connecting rod 23 is sleeved with a clamping spring 24 abutting against the fixed plate 1.

[0040] Under the action of the clamping spring 24, one end of the fixed plate 1 and the movable plate 2 can be pushed outward, so that the fixed plate 1 and the movable plate 2 can be stably buckled outside the cable.

[0041] Further, referring to Figure 4 , Figure 5 and Figure 8 , the driving part 9 includes a double-shaft motor 25 fixed to the bottom of the connecting plate 17 through a motor bracket, the output end of the double-shaft motor 25 is fixed with a driving rod 26, the driving rod 26 is rotatably inserted into the installation cavity 8 and is fixed with a half gear 27, and a tooth groove 28 meshing with the half gear 27 is formed in one of the linkage plates 7.

[0042] In the scheme, the principle of improving the detection range of the conductive spring needle 15 by matching the driving part 9 with the reset member 6 is as follows:

[0043] First, insert the two leads of the multimeter into the butt joint cylinder 13, start to detect the insulation of the outside of the cable, and then rotate the double-shaft motor 25 to drive the two driving rods 26 to rotate, under the rotation of the half gear 27, the linkage plate 7 with the tooth groove 28 formed therein starts to move correspondingly, pulls the moving plate 5 to slide in the opening 4, under the abutting action of the two linkage plates 7, the other moving plate 5 also starts to slide synchronously in the same direction in the opening 4, and the arc-shaped spring 21 is tightened and stored;

[0044] Afterwards, when the half gear 27 continues to rotate to a toothless state corresponding to the tooth groove 28, the arc spring 21 in the stored force state begins to push outward to release the elastic force, and the two arc springs 21 act synchronously to push the two movable plates 5 in the opening 4, and cooperate with the half gear 27 and the tooth groove 28 to engage the rotating sleeve to drive the linkage plate 7 to move in the opposite direction, thereby driving the movable plate 5 to swing back and forth in the opening 4, so that the arc spring plate 14 drives the conductive spring needle 15 to rotate along the outside of the cable, so that the conductive spring needle 15 on the arc spring plate 14 can completely contact the outside of the cable, and there is no need to wrap the entire cable, which reduces the friction generated when the conductive spring needle 15 contacts the cable, making the cable smoother when pulled.

[0045] It should be noted that in order to improve the accuracy of the detection, after moving from one end of the cable to the other, the personnel can rotate the cable and then move in the opposite direction to detect it again.

[0046] For further information, see Figure 4 - Figure 7 The wiping portion 11 includes two sliding rods 31 slidably inserted on the movable plate 5. A limiting ball 32 is fixed to the top of the sliding rod 31, and an end plate 33 is fixed to the bottom. The outer side of the sliding rod 31 is covered with an extrusion spring 34 that drives the end plate 33 toward the cable. The outer side of the end plate 33 is installed with a fitting 35 that fits with the outer side of the cable.

[0047] The fitting member 35 includes an elastic plate 36 , a track plate 37 is fixed on the elastic plate 36 , a docking rod 38 connected to the track plate 37 is fixed to the bottom of the end plate 33 , and a wiping sleeve 39 is sleeved on the outer side of the elastic plate 36 .

[0048] It should be noted that under the action of the extrusion spring 34, the elastic plate 36 will be pushed toward the cable. The elastic plate 36 has a certain elasticity. When it contacts the cable, it will first be in a straight plate state. After contact, it will be deformed into an arc plate state. The sliding rods 31 set at both ends will push the elastic plate 36 so that its two ends fit with the cable, so that the fitting part 35 can fit tightly with the outside of the cable, and cooperate with the movable plate 5 to move in the opening 4, so that the outside of the cable can be wiped in all aspects, effectively removing the attachments on the outside of the cable, and enabling subsequent detection to avoid detection errors caused by the attachments contacting the conductive spring needle 15.

[0049] In this solution, the specific process of low-voltage cable outer insulation testing includes the following steps:

[0050] In the first step, the personnel first open the movable plate 2 and match it with the fixed plate 1, buckling it on the outside of the cable. Then, the multimeter is placed in the placement frame 18 on the connecting plate 17, and the two leads are inserted into the two docking sockets 13 respectively;

[0051] Second, through the drive part 9 cooperate reset member 6, so that the wiping part 11 and arc-shaped elastic plate 14 along the cable outside reciprocating rotation, at the same time, the fixed plate 1 begins to move along the cable or pull the cable, begin to detect the outside of the cable;

[0052] Third, personnel through the observation of multimeter data display, through the multimeter in the cable different position value change, to judge the cable leakage insulation performance state.

[0053] In the scheme, the inner layer of the wiping sleeve 39 is an elastic layer, and the outer side is a velvet layer, which can be sleeved outside the elastic plate 36 and correspondingly changed with the deformation of the elastic plate 36, and the velvet layer on the outside wipes the outside of the cable. After detecting one cable or a certain distance, the wiping sleeve 39 can be disassembled and replaced with a new wiping sleeve 39 to achieve the purpose of ensuring the wiping effect.

[0054] Example two: please refer to Figure 3 Figure 5 The embodiment is further illustrated based on example one, and the difference lies in that the structure of the fixed plate 1, the movable plate 2 and the connecting plate 17 is optimized to facilitate the operation of personnel during the detection of the cable.

[0055] Specifically, the two fixed plates 1 are fixed with connecting rods 29, and the two movable plates 2 are fixed with adjusting plates 30, wherein the connecting plate 17 is fixed with a supporting plate 22 for supporting the detection instrument 19.

[0056] It should be noted that the connecting rods 29 arranged at the tail ends of the two fixed plates 1 facilitate personnel to control the positions of the two fixed plates 1 on the cable with one hand, and the adjusting plates 30 can be used to control the turning adjustment of the two movable plates 2 on the fixed plate 1 at one time, and the supporting plate 22 can further ensure the stability of the detection instrument 19 placed in the placing frame 18, so that personnel can more intuitively observe the instrument data during detection.

[0057] It should be noted that in this document, relational terms such as first and second and the like can only be used to distinguish one entity or operation from another entity or operation, without necessarily requiring or implying any such actual relationship or order between such entities or operations. Moreover, the terms "comprising", "including", or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or apparatus that includes a series of elements includes not only those elements, but also other elements not explicitly listed or other elements inherent to such process, method, article or apparatus.

[0058] ​While embodiments of the application have been shown and described, it is to be understood that the embodiments described are merely exemplary of the principles and application of the present application. Numerous modifications and adaptions can be effected without departing from the spirit and scope of the present application, which is not limited to the exact construction and arrangement described.

Claims

1. A low-voltage cable insulation detection mechanism, comprising: Two fixed plates (1), with movable plates (2) rotatably mounted on the fixed plates (1); It is characterized by further comprising: A clamping member (3), which clamps the fixed plate (1) and the movable plate (2) on the outside of the low-voltage cable, and the fixed plate (1) and the movable plate (2) are both provided with openings (4), and; A movable plate (5) is slidably mounted in the opening (4), a reset member (6) is mounted on the movable plate (5) and is in contact with the opening (4), a linkage plate (7) is fixed to adjacent ends of the two movable plates (5), a mounting cavity (8) is provided in the fixed plate (1), and a driving portion (9) for driving the linkage plate (7) to move is mounted in the mounting cavity (8), the reset member (6) comprises an arc-shaped slide rod (20) fixed in the opening (4), the arc-shaped slide rod (20) is slidably plugged with the movable plate (5), and an arc-shaped spring (21) is sleeved on the outer side of the arc-shaped slide rod (20) and is in contact with the movable plate (5) and the inner wall of the opening (4), and the two movable plates (5) are pushed by the two arc-shaped springs (21) so that the two linkage plates (7) are in contact with each other, and; A cable detection unit (10) is installed on two adjacent movable plates (5), and the insulation of the low-voltage cable is detected by the cable detection unit. The cable detection unit (10) includes an insertion rod (12) slidably inserted on the movable plate (5), a docking tube (13) is fixed on the top of the insertion rod (12), and an arc-shaped spring plate (14) is fixed on the bottom. A plurality of conductive spring needles (15) are installed on the bottom of the arc-shaped spring plate (14), and a push spring (16) is sleeved on the outside of the insertion rod (12) for pushing the arc-shaped spring plate (14) downward, and; The wiping part (11) is installed on the other two movable plates (5), and the sundries on the outer side of the cable are wiped by the wiping part (11).

2. A low-voltage cable insulation detection mechanism according to claim 1, characterized in that: A connecting plate (17) is installed between the two fixed plates (1), and a placement frame (18) is provided on the connecting plate (17), and a detection instrument (19) is placed in the placement frame (18).

3. A low-voltage cable insulation detection mechanism according to claim 1, characterized in that: The two adjacent linkage plates (7) are arc-shaped, and the two linkage plates (7) are attached to the inner sides of the fixed plate (1) and the movable plate (2), and end blocks are fixed at adjacent ends of the two linkage plates (7).

4. A low-voltage cable insulation detection mechanism according to claim 2, characterized in that: A supporting plate (22) for supporting the detection instrument (19) is fixed on the connecting plate (17).

5. A low-voltage cable insulation detection mechanism according to claim 1, characterized in that: The clamping member (3) comprises an arc-shaped connecting rod (23) fixed on the movable plate (2), one end of the arc-shaped connecting rod (23) is slidably plugged into the fixed plate (1), and a clamping spring (24) is sleeved on the outer side of the arc-shaped connecting rod (23) and abuts against the fixed plate (1).

6. A low-voltage cable insulation detection mechanism according to claim 2, characterized in that: The driving part (9) includes a dual-axis motor (25) fixed to the bottom of the connecting plate (17) through a motor frame, and a driving rod (26) is fixed to the output end of the dual-axis motor (25). The driving rod (26) rotates and extends into the installation cavity (8) and is fixed with a half gear (27). One of the linkage plates (7) is provided with a tooth groove (28) that meshes with the half gear (27).

7. A low-voltage cable insulation detection mechanism according to claim 1, characterized in that: Connecting rods (29) are fixed on the two fixed plates (1), and adjusting plates (30) are fixed on the two movable plates (2).

8. A low-voltage cable insulation detection mechanism according to claim 1, characterized in that: The wiping portion (11) includes two sliding rods (31) slidably inserted on the movable plate (5), a limiting ball (32) is fixed on the top of the sliding rod (31), and an end plate (33) is fixed on the bottom. The outer side of the sliding rod (31) is covered with an extrusion spring (34) that drives the end plate (33) toward the cable, and the outer side of the end plate (33) is installed with a fitting (35) that fits with the outer side of the cable.

9. A low-voltage cable insulation detection mechanism according to claim 8, characterized in that: The fitting member (35) comprises an elastic plate (36), a track plate (37) is fixed on the elastic plate (36), a docking rod (38) connected to the track plate (37) is fixed at the bottom of the end plate (33), and a wiping sleeve (39) is sleeved on the outer side of the elastic plate (36).

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