A cable heating through-core transformer auxiliary opening device and cable placement method

Abstract

The present invention discloses a power cable heating auxiliary device in the field of cable pre-qualification test technology, comprising a fixing frame, the fixing frame comprising a left connecting section and a right suspended section, the left connecting section can be detachably fixedly connected to the upper edge of a through-core transformer, and the right suspended section is suspended above the right side of the right iron core of the through-core transformer; an electric hoist, the electric hoist is connected to the bottom of the right suspended section, and is used to pull the right iron core to flip upward; a sling, the end of the sling can be detachably fixedly connected to the bottom end of the right iron core, and the middle part is connected to the hook of the electric hoist. The present invention utilizes the principle of lever, and pulls the right iron core to flip upward by the electric hoist that is relatively stationary with the through-core transformer, so as to realize the rapid opening of the through-core transformer, which can not only save manpower and ensure operation safety, but also improve work efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of prequalification tests for cables, and particularly to an auxiliary heating device for power cables. Background Art

[0002] According to the relevant standards (GB / T 18890.1) announced by the state, power cables at home and abroad need to undergo type tests or prequalification tests. Among them, the prequalification test is to simulate the laying environment and operating conditions of the cable in actual applications, and through long-term (one year) DC voltage tests and superimposed impulse voltage tests, to check the long-term performance of the cable and its accessories to ensure the safe operation of the cable and the power grid.

[0003] In the long-term voltage test, it is necessary to heat the conductors inside the cable. Currently, the more common heating method is electromagnetic induction heating, and the device used for electromagnetic induction heating is a through-core transformer (also called a series-core transformer). As Figure 8 shown, the through-core transformer includes an upper iron core 540, a lower iron core 560, a left iron core 550, and a right iron core 520; among them, the upper iron core 540, the left iron core 550, and the lower iron core 560 are fixedly connected by welding to form a U-shaped main iron core 510 with an open right side. The top of the right iron core 520 is rotatably connected to the top of the U-shaped main iron core 510 through a pin shaft 570, so that the right iron core 520 can be turned upwards and the right opening of the U-shaped main iron core 510 can be opened to facilitate the cable to be placed into the central through-hole of the through-core transformer; at the same time, both the top and bottom of the right iron core 520 are detachably fixedly connected to the open side of the U-shaped main iron core 510 through connecting rods 580, so that the through-core transformer as a whole is in a square shape.

[0004] However, in actual production activities, when opening the through-core transformer, there are mainly two methods. In a wide area, a forklift or a crane is mainly used to lift the right iron core upwards; in a narrow space (tunnel), the right iron core is mainly lifted upwards by manpower. However, since the weight of the right iron core is about 100 kg, two adults are required to lift it; at the same time, since the overall height of the through-core transformer is about 1 m, the operator needs to apply an upward turning force to the right iron core in a bent state, which is not only inconvenient but also poses a great safety hazard, and hand pinching and waist sprains often occur. In addition, in the prequalification test, generally about twenty through-core transformers are used in parallel. If all the cables are manually placed into the central through-holes of the through-core transformers, not only is the labor intensity high, but also the operation time is long and the efficiency is low. Summary of the Invention

[0005] In view of this, the purpose of the present invention is to provide an auxiliary opening device for a through-core transformer used for cable heating to solve the technical problems of time-consuming, laborious, and low efficiency of the existing manual operation.

[0006] The technical solution adopted by the present invention is as follows: an auxiliary opening device for a through-type transformer used for cable heating. The through-type transformer includes a U-shaped main iron core and a right iron core. The top of the U-shaped main iron core is provided with an upper edge. The device includes:

[0007] A fixing frame, which includes a left connecting section and a right suspended section. The left connecting section can be detachably and fixedly connected to the upper edge of the through-type transformer, and the right suspended section is suspended above the right side of the right iron core of the through-type transformer.

[0008] An electric hoist, which is connected to the lower part of the right suspended section and is used to pull the right iron core to turn upwards.

[0009] A sling, the end of which can be detachably and fixedly connected to the bottom end of the right iron core, and the middle part is connected to the hook of the electric hoist.

[0010] Preferably, fixed clamping plates and movable clamping plates are correspondingly arranged on the front and rear sides of the left connecting section. Both the fixed clamping plate and the movable clamping plate include a vertical connecting portion and a horizontal abutting portion. The vertical connecting portion is used to connect with the left connecting section.

[0011] The movable clamping plate is detachably connected to the left connecting section, and the distance between the two horizontal abutting portions is less than the distance between the upper edges on both sides of the through-type transformer, so that the fixing frame can be clamped and fixedly connected to the upper edge of the through-type transformer; or

[0012] The distance between the movable clamping plate and the fixed clamping plate is adjustable, so that the distance between the two horizontal abutting portions can be less than the distance between the upper edges on both sides of the through-type transformer, and the fixing frame can be clamped and fixedly connected to the upper edge of the through-type transformer.

[0013] Preferably, a plurality of connecting through holes are linearly distributed on one side of the left connecting section of the fixing frame, and a plurality of threaded holes corresponding to the connecting through holes one by one are linearly distributed on the vertical connecting portion of the movable clamping plate. A fastening bolt for fixedly connecting the movable clamping plate and the fixing frame is threadedly connected in the threaded hole.

[0014] Preferably, a plurality of horizontal guide rods are linearly arrayed on one side of the left connecting section of the fixing frame, and a plurality of guide holes corresponding to the horizontal guide rods one by one are linearly distributed on the vertical connecting portion of the movable clamping plate. The horizontal guide rods are slidably connected in the guide holes, and a stop plate for limiting the movable clamping plate is fixedly connected to the end of the horizontal guide rod.

[0015] Preferably, a positioning screw is threadedly connected to the stop plate. One end of the positioning screw is rotatably connected to the movable clamping plate, and the other end is fixedly connected to a rotating handle, so as to adjust the distance between the fixed clamping plate and the movable clamping plate through the axial movement of the positioning screw.

[0016] Preferably, the middle portion of the sling is movably inserted into the hook.

[0017] Preferably, U-shaped connectors are provided at both ends of the sling, and connecting bolts are passed through the open ends of the U-shaped connectors. The connecting bolts are used to detachably and fixedly connect the end of the sling to the connecting rod at the bottom end of the right iron core.

[0018] Preferably, the length of the right suspended section is 1 to 2.5 times the length of the left connecting section.

[0019] Preferably, a reinforcing rib is fixedly connected above the fixing frame, and the reinforcing rib is arranged along the extension direction of the fixing frame.

[0020] Another object of the present invention is to provide a cable placement method, the method comprising the following steps:

[0021] S10: Install a fixing frame on the top of the through-core transformer, and one end of the fixing frame is suspended above the right side of the right iron core of the through-core transformer and is connected to an electric hoist;

[0022] S20: Connecting the two ends of the sling to the two sides of the bottom end of the right iron core in a one-to-one correspondence; wherein the middle part of the sling is inserted into the hook of the electric hoist;

[0023] S30: Control the electric hoist to pull the right iron core to flip upward;

[0024] S40: pushing the through-hole transformer to move until the lifted cable enters the central through hole of the through-hole transformer;

[0025] S50: Control the electric hoist to lower the right iron core.

[0026] Beneficial effects of the present invention:

[0027] The present invention utilizes the lever principle. First, the left connecting section of the fixing frame is detachably fixedly connected to the upper edge of the through-core transformer by means of a clamping method. Meanwhile, the right suspended section of the fixing frame is suspended above the right side of the right iron core. Then, the electric hoist is fixedly connected to the bottom of the right suspended section. Finally, the sling is passed through the hook of the electric hoist, and the two ends of the sling are fixedly connected to the two sides of the bottom end of the right iron core. Under the pulling force of the electric hoist, the right iron core can be driven to automatically flip upward to realize the opening of the through-core transformer. Meanwhile, since the fixing frame is fixed on the through-core transformer, the electric hoist and the through-core transformer can move synchronously, thereby realizing the stability of the right iron core during the movement of the through-core transformer, thereby facilitating the placement of the lifted cable in the central through hole of the through-core transformer.

[0028] The present invention replaces manual labor with machinery, which not only improves work efficiency, but also saves manpower and improves operation safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a simulation diagram of the usage state of the auxiliary opening device of the穿心transformer for cable heating of the present invention;

[0030] Figure 2 It is a simplified diagram of the usage state of the auxiliary opening device of the穿心transformer for cable heating of the present invention;

[0031] Figure 3 It is one of the side views of the fixing frame;

[0032] Figure 4 It is the second side view of the fixing frame;

[0033] Figure 5 It is the top view of the fixing frame;

[0034] Figure 6 It is a structural schematic diagram of the sling;

[0035] Figure 7 It is a schematic diagram of cable placement;

[0036] Figure 8 It is a structural schematic diagram of the穿心transformer.

[0037] Explanation of the reference numerals in the figure:

[0038] 100, fixing frame;

[0039] 110, left connecting section; 120, right suspended section; 130, fixed clamping plate; 140, movable clamping plate; 150, fastening bolt; 160, horizontal guide rod; 170, stop baffle; 180, positioning screw; 190, rotating handle;

[0040] 200, electric hoist;

[0041] 210, hook;

[0042] 300, sling;

[0043] 310, U-shaped connecting piece; 320, connecting bolt;

[0044] 400, reinforcing rib;

[0045] 500,穿心transformer;

[0046] 510, C-shaped main iron core; 520, right iron core; 530, upper edge; 540, upper iron core; 550, lower iron core; 560, left iron core; 570, pin shaft; 580, connecting rod; 590, moving wheel;

[0047] 600, cable. Detailed implementation manner

[0048] It should be noted that the term "穿心transformer" in the original text may be a specific technical term in Chinese, and it is recommended to further confirm its accurate English expression according to the actual technical content. Here, a literal translation is provided first.The following further elaborates on the specific embodiments of the present invention in conjunction with the accompanying drawings. These embodiments are only for illustrating the present invention and are not intended to limit the present invention.

[0049] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is 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 cannot be construed as a limitation of the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0050] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside 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.

[0051] In addition, in the description of the present invention, unless otherwise stated, the meaning of "a plurality" is two or more.

[0052] Embodiment, as Figure 1-Figure 6 shown, an auxiliary opening device for a cable heating through-type transformer. When pre-identifying the cable 600, this device can quickly replace manual operation to open the through-type transformer 500. Among them, the through-type transformer 500 includes a U-shaped main iron core 510 and a right iron core 520. The top of the right iron core 520 is rotatably connected to the right top of the U-shaped main iron core 510 through the pin shaft 570, and there is an upper edge 530 at the top of the U-shaped main iron core 510. This device specifically includes:

[0053] A fixed frame 100, which includes a fixedly connected left connection section 110 and a right suspended section 120. The left connection section 110 can be detachably fixedly connected to the upper edge 530 of the through-type transformer 500, so that the fixed frame 100 is fixed on the top of the through-type transformer 500, and at the same time, the right suspended section 120 is suspended above the right side of the right iron core 520 of the through-type transformer 500.

[0054] An electric hoist 200, which is connected below the right suspended section 120 and includes a hook 210.

[0055] A sling 300 , the end of which can be detachably fixedly connected to the bottom end of the right iron core 520 , and the middle part of which is connected to the hook 210 , thereby achieving the connection between the hook 210 and the right iron core 520 .

[0056] The present application utilizes the lever principle. First, the left connecting section 110 of the fixing frame 100 is detachably fixedly connected to the upper edge 530 of the through-core transformer 500, and the right suspended section 120 of the fixing frame 100 is suspended above the right side of the right iron core 520, and then the electric hoist 200 is fixedly connected to the bottom of the right suspended section 120, and finally the sling 300 is inserted into the hook 210 of the electric hoist 200, and the two ends of the sling 300 are fixedly connected to the two sides of the bottom end of the right iron core 520, and the right iron core 520 can be driven to automatically flip upward under the pulling force of the electric hoist 200 to realize the opening of the through-core transformer 500; at the same time, because the fixing frame 100 is fixed on the top of the through-core transformer 500, the electric hoist 200 and the through-core transformer 500 can keep moving synchronously, so that the right iron core 520 is relatively stable during the movement of the through-core transformer 500, so that it is convenient to place the lifted cable 600 in the central through hole of the through-core transformer 500.

[0057] In a specific embodiment, if Figure 3 , Figure 4 , Figure 5 As shown, a fixed clamp 130 is correspondingly connected to the rear side of the left connecting section 110, and a movable clamp 140 is correspondingly connected to the front side of the left connecting section 110; both the fixed clamp 130 and the movable clamp 140 include a vertical connecting portion and a horizontal abutting portion, and the vertical connecting portion and the horizontal abutting portion are integrally formed and vertically connected, so that the fixed clamp 130 and the movable clamp 140 are L-shaped as a whole; the fixed clamp 130 and the movable clamp 140 are arranged opposite to each other, that is, the spacing between the two horizontal abutting portions is smaller than the spacing between the two vertical connecting portions, so that a slot for clamping with the upper edge 530 of the through-core transformer 500 is formed between the horizontal abutting portion and the left connecting section 110.

[0058] This arrangement is because: during the pre-identification test, the cable needs to be placed in the central through hole of 20 parallel through-core transformers 500, so the fixing frame 100 needs to be frequently connected and disassembled with the upper edge 530 of the through-core transformer 500. Compared with using bolts to directly connect the left connecting section 110 of the fixing frame 100 with the upper edge 530 of the through-core transformer 500, the clamping method in this embodiment not only has the advantage of fast connection and disassembly speed, but also can increase the contact area between the fixing frame 100 and the upper edge 530 through the abutment of the horizontal abutting parts of the fixed clamping plate 130 and the movable clamping plate 140 with the upper edge 530, so that the fixing frame 100 is subjected to more uniform force, thereby preventing safety accidents caused by bolt breakage.

[0059] In a specific embodiment, if Figure 3 As shown, on the front side of the left connecting section 110 of the fixing frame 100, a plurality of connecting through holes are linearly distributed along the extension direction of the fixing frame 100; at the same time, on the vertical connecting portion of the movable splint 140, a plurality of threaded holes are linearly distributed along the extension direction of the fixing frame 100, and the threaded holes are in a one-to-one correspondence with the connecting through holes, and a fastening bolt 150 is threadedly connected in the threaded hole, and the fastening bolt 150 enables the movable splint 140 to be detachably fixedly connected to the fixing frame 100, and the spacing between the horizontal abutting portion of the fixing splint 130 and the horizontal abutting portion of the movable splint 140 is smaller than the distance between the upper edges 530 on both sides of the through-core transformer 500, so that the fixing frame 100 can be clamped and fixedly connected with the upper edge 530 of the through-core transformer 500.

[0060] This arrangement is because: in the present application, the left connecting section 110 of the fixing frame 100 and the upper edge 530 of the through-core transformer 500 are connected by a snap-fitting manner. When the movable clamping plate 140 is detachably connected to the fixing frame 100 by bolting, not only can the distance between the horizontal abutting portion of the fixing clamping plate 130 and the horizontal abutting portion of the movable clamping plate 140 meet the requirements of the snap-fitting connection, but it is also convenient to release the fixed connection relationship between the fixing frame 100 and the top upper edge 530 of the through-core transformer 500.

[0061] In a specific embodiment, if Figure 4 , Figure 5 As shown, on the front side of the left connecting section 110 of the fixing frame 100, there are a plurality of horizontal guide rods 160 arranged in a linear array along the extension direction of the fixing frame 100; and on the vertical connecting portion of the movable clamping plate 140, there are a plurality of guide holes arranged in a linear array along the extension direction of the fixing frame 100, and the guide holes are in a one-to-one correspondence with the horizontal guide rods 160; the horizontal guide rods 160 are slidably connected in the guide holes, so that the movable clamping plate 140 can move along the axis direction of the horizontal guide rods 160, that is, the spacing between the movable clamping plate 140 and the fixed clamping plate 130 is adjustable. A stopper plate 170 is fixedly connected to the end of the horizontal guide rod 160, and the stopper plate 170 is used to limit the axial movement of the movable clamping plate 140, so that the spacing between the horizontal abutting portion of the fixed clamping plate 130 and the horizontal abutting portion of the movable clamping plate 140 can be smaller than the distance between the upper edges 530 of the through-core transformer 500, thereby realizing the clamping and fixed connection between the fixing frame 100 and the upper edge 530 of the through-core transformer 500.

[0062] The reason for such arrangement is that the connection mode between the fixing frame 100 and the through-hole transformer 500 determines the working efficiency. In the present embodiment, the movable clamping plate 140 is slidably connected through the horizontal guide rod 160, so that the spacing between the fixing clamping plate 130 and the movable clamping plate 140 is adjustable, and the clamping connection between the fixing frame 100 and the upper edge 530 of the through-hole transformer 500 can be quickly realized, and the clamping connection can be released, which is conducive to improving the working efficiency and reducing the modification of the through-hole transformer 500, because the bolt connection mode requires drilling holes on the upper edge 530 of the through-hole transformer 500.

[0063] Preferably, Figure 5 As shown, a threaded through hole is provided in the middle of the stop plate 170, and a positioning screw 180 is threadedly connected in the threaded through hole. The positioning screw 180 is arranged parallel to the horizontal guide rod 160, and one end of the positioning screw 180 is rotatably connected to the movable clamping plate 140 through a bearing, and the other end is fixedly connected with a rotating handle 190, so that the positioning screw 180 is driven to rotate by the rotating handle 190, and then the distance between the fixed clamping plate 130 and the movable clamping plate 140 is adjusted by the axial movement of the positioning screw 180.

[0064] The reason for such arrangement is that: a positioning screw 180 is threadedly connected to the stop plate 170, and one end of the positioning screw 180 is rotatably connected to the movable clamping plate 140, and the other end is connected to the rotating handle 190. The positioning screw 180 can be driven to rotate by rotating the rotating handle 190, and the positioning screw 180 drives the movable clamping plate 140 to move along the front-back direction of the through-core transformer 500 through the threaded engagement of the positioning screw 180 and the stop plate 170, thereby adjusting the spacing between the fixed clamping plate 130 and the movable clamping plate 140, thereby realizing the clamping and release of the fixing frame 100 and the upper edge 530.

[0065] In a specific embodiment, if Figure 1 , Figure 2 As shown, the middle portion of the sling 300 is movably inserted into the hook 210 .

[0066] This arrangement is because: the middle part of the sling 300 is inserted into the hook 210, and after the two ends of the sling 300 are tied and fixedly connected to the two connecting rods 580 at the bottom end of the right iron core 520, the sling 300 can be moved in the hook 210 so that the two ends of the sling 300 apply the same force to the two sides of the bottom end of the right iron core 520 to ensure that the through-core transformer 500 is opened smoothly.

[0067] Preferably, Figure 6As shown, U-shaped connectors 310 are fixedly connected at both ends of the sling 300, the middle part of the U-shaped connector 310 is fixedly connected to the end of the sling 300, and coaxial connecting holes are provided on the two legs of the U-shaped connector 310, a connecting bolt 320 is passed through the connecting hole, and a connecting nut is threadedly connected to the connecting bolt 320; the connecting bolt 320 is used to detachably fix the end of the sling 300 to the connecting rod 580 at the bottom end of the right iron core 520.

[0068] This is because through holes are provided on the connecting rods 580 at both sides of the bottom of the right iron core 520. After the U-shaped connecting pieces 310 are fixedly connected to both ends of the sling 300, the connection bolts 320 can be inserted into the through holes of the U-shaped connecting piece 310 and the connecting rods 580, and the connecting nuts can be tightened to quickly connect the sling 300 to the right iron core 520.

[0069] In a specific embodiment, the length of the right suspended section 120 is 1 to 2.5 times the length of the left connecting section 110 .

[0070] This arrangement is because: if the length of the fixing frame 100 is too long, it is not convenient to use in a narrow space such as a tunnel; if the length of the fixing frame 100 is too short, the distance between the electric hoist 200 and the pin shaft 570 of the through-core transformer 500 will be too short, and the length of the power arm for the right iron core 520 to flip upward will be too short, which is not conducive to the opening of the through-core transformer 500.

[0071] Preferably, the length of the right suspended section 120 is 1.5 to 2 times the length of the left connecting section 110 .

[0072] In a specific embodiment, if Figure 1 As shown, a reinforcing rib 400 is fixedly connected above the fixing frame 100 , and the reinforcing rib 400 is arranged in the middle of the fixing frame 100 along the extension direction of the fixing frame 100 .

[0073] This arrangement is because: the overall weight of the through-core transformer 500 is about 500kg. When the right iron core 520 is pulled upward by the electric hoist 200 to flip, although the deadweight of the through-core transformer 500 can maintain the stability of the through-core transformer 500 and effectively prevent the through-core transformer 500 from tipping over, the weight of the right iron core 520 is about 100kg. Under the gravity of the right iron core 520, the fixing frame 100 is easily broken at the connection position between the left connecting section 110 and the right suspended section 120. In this embodiment, a reinforcing rib 400 is fixedly connected to the fixing frame 100 along the extension direction. The reinforcing rib 400 can effectively improve the structural strength of the fixing frame 100 and effectively prevent the fixing frame 100 from breaking.

[0074] Preferably, the fixing frame 100 is a steel plate which is wider on the left and narrower on the right.

[0075] In a specific embodiment, the electric hoist 200 is a micro electric hoist.

[0076] This arrangement is because: the lifting capacity of the micro electric hoist is 1000kg, which can fully meet the opening requirements of the through-core transformer 500, and has the advantages of small size and light weight, which makes it easy to install the electric hoist 200 under the right suspended section 120 of the fixing frame 100.

[0077] Example: Figure 7 As shown, a cable placement method uses the above-mentioned cable heating through-core transformer auxiliary opening device, and the method specifically includes the following steps:

[0078] S10: A fixing frame 100 is installed on the top of the through-core transformer 500 , and one end of the fixing frame 100 is suspended above the right side of the right iron core 520 of the through-core transformer 500 , and is connected to the electric hoist 200 .

[0079] Specifically, first place the left connecting section 110 of the fixing frame 100 on the top of the through-core transformer 500, move the fixing frame 100 in the front-to-back direction so that the rear upper edge 530 of the through-core transformer 500 is clamped between the fixed clamp 130 and the fixing frame 100, and then use the fastening bolts to fix the movable clamp 140 to the fixing frame 100, or rotate the rotating handle 190 to move the movable clamp 140 toward the fixed clamp 130, so that the front upper edge 530 of the through-core transformer 500 is clamped between the movable clamp 140 and the fixing frame 100; then install the electric hoist 200 under the right suspended section 120 of the fixing frame 100.

[0080] S20: Connect the two ends of the sling 300 to the two sides of the bottom end of the right iron core 520 one by one; wherein the middle part of the sling 300 is inserted into the hook 210 of the electric hoist 200 .

[0081] Specifically: the middle part of the sling 300 is passed through the hook 210 of the electric hoist 200, and the two ends of the sling 300 are manually tied and fixed to the connecting rods 580 on the front and rear sides of the bottom end of the right iron core 520, or a U-shaped connector 310 and a connecting bolt 320 are used to connect the two ends of the sling 300 to the connecting rods 580 on the front and rear sides of the bottom end of the right iron core 520.

[0082] S30: By means of remote control, the electric hoist 200 is controlled to pull the right iron core 520 to flip upward to the right until the requirement of placing the cable 600 into the through-core transformer 500 is met.

[0083] S40: manually push the through-core transformer 500 to move horizontally toward the cable 600 until the lifted cable 600 enters the central through hole of the through-core transformer 500; wherein, a moving wheel 590 is provided at the bottom of the through-core transformer 500.

[0084] S50: By remote control, the electric hoist 200 is controlled to slowly release the right iron core 520, so that the right iron core 520 closes the through-core transformer 500 under the action of gravity, and the through-core transformer 500 is manually locked.

[0085] S60: first remove the connection between the sling 300 and the right iron core 520, then disassemble the electric hoist 200, and finally release the clamping connection between the fixing frame 100 and the upper edge 530 of the through-core transformer 500.

[0086] Compared with the prior art, this application has at least the following beneficial technical effects:

[0087] 1. The device in this application can improve work efficiency, save manpower, and is safer.

[0088] 2. The device in this application is suitable for use in narrow spaces such as tunnels, solving the dilemma of forklifts being unable to enter or having to rely on manual labor in the absence of cranes.

[0089] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. An auxiliary opening device for a cable heating through-type transformer, which is used to turn the right iron core (520) of the through-type transformer (500) in a narrow space upward. The through-type transformer (500) includes a U-shaped main iron core (510) and a right iron core (520). The top of the right iron core (520) is rotatably connected to the top of the U-shaped main iron core (510) through a pin shaft (570). The top of the U-shaped main iron core (510) is provided with an upper edge (530), and it is characterized in that, The device includes: A fixing frame (100), the fixing frame (100) comprising a left connecting section (110) and a right suspended section (120), the left connecting section (110) being capable of being detachably fixedly connected to an upper edge (530) of a through-core transformer (500), and the right suspended section (120) being suspended above the right side of a right iron core (520) of the through-core transformer (500); An electric hoist (200), the electric hoist (200) being connected below the right suspended section (120) and being used to pull the right iron core (520) to flip upward; A sling (300), wherein the end of the sling (300) can be detachably fixedly connected to the bottom end of the right iron core (520), the middle portion of the sling (300) is connected to the hook (210) of the electric hoist (200), and the middle portion of the sling (300) is movably inserted into the hook (210); A fixed clamping plate (130) and a movable clamping plate (140) are provided on the front and rear sides of the left connecting section (110), respectively. The fixed clamping plate (130) and the movable clamping plate (140) both comprise a vertical connecting portion and a horizontal abutting portion. The vertical connecting portion is used to connect to the left connecting section (110). The movable clamping plate (140) is detachably connected to the left connecting section (110), and the distance between the two horizontal abutment portions is smaller than the distance between the upper edges (530) on both sides of the through-hole transformer (500), so that the fixing frame (100) can be fixedly connected to the upper edge (530) of the through-hole transformer (500) by snapping; or The spacing between the movable clamping plate (140) and the fixed clamping plate (130) is adjustable, so that the spacing between the two horizontal abutment portions can be smaller than the distance between the upper edges (530) on both sides of the through-hole transformer (500), and a clamping and fixed connection between the fixing frame (100) and the upper edge (530) of the through-hole transformer (500) is achieved.

2. The cable heating through-core transformer auxiliary opening device according to claim 1 is characterized in that: A plurality of connecting through holes are linearly distributed on one side of the left connecting section (110) of the fixing frame (100), a plurality of threaded holes corresponding to the connecting through holes are linearly distributed on the vertical connecting portion of the movable clamping plate (140), and fastening bolts (150) are threadedly connected in the threaded holes to fix the movable clamping plate (140) to the fixing frame (100).

3. The cable heating through-core transformer auxiliary opening device according to claim 1 is characterized in that: A linear array is provided on one side of the left connecting section (110) of the fixing frame (100), and a plurality of guide holes corresponding to the horizontal guide rods (160) are linearly distributed on the vertical connecting portion of the movable splint (140), and the horizontal guide rod (160) is slidably connected in the guide hole, and a stop plate (170) is fixedly connected to the end of the horizontal guide rod (160) for limiting the movable splint (140).

4. The cable heating through-core transformer auxiliary opening device according to claim 3 is characterized in that: A positioning screw (180) is threadedly connected to the stop plate (170), one end of the positioning screw (180) is rotatably connected to the movable clamping plate (140), and the other end is fixedly connected to a rotating handle (190) so that the distance between the fixed clamping plate (130) and the movable clamping plate (140) can be adjusted by axial movement of the positioning screw (180).

5. The cable heating through-core transformer auxiliary opening device according to claim 1 is characterized in that: U-shaped connecting pieces (310) are provided at both ends of the sling (300), and connecting bolts (320) are passed through the open ends of the U-shaped connecting pieces (310). The connecting bolts (320) are used to detachably and fixedly connect the ends of the sling (300) to the connecting rod (580) at the bottom end of the right iron core (520).

6. The cable heating through-core transformer auxiliary opening device according to claim 1 is characterized in that: The length of the right suspended section (120) is 1 to 2.5 times the length of the left connecting section (110).

7. The cable heating through-core transformer auxiliary opening device according to claim 1 is characterized in that: A reinforcing rib (400) is fixedly connected to the top of the fixing frame (100), and the reinforcing rib (400) is arranged along the extension direction of the fixing frame (100).

8. A cable placement method, the method using the cable heating through-core transformer auxiliary opening device according to any one of claims 1 to 7, characterized in that: The method comprises the following steps: S10: installing a fixing frame (100) on the top of the through-core transformer (500), with one end of the fixing frame (100) suspended above the right side of the right iron core (520) of the through-core transformer (500) and connected to an electric hoist (200); S20: Connecting the two ends of the sling (300) to the two sides of the bottom end of the right iron core (520) in a one-to-one correspondence; wherein the middle portion of the sling (300) is inserted into the hook (210) of the electric hoist (200); S30: controlling the electric hoist (200) to pull the right iron core (520) to flip upward; S40: pushing the through-hole transformer (500) to move until the lifted cable (600) enters the central through hole of the through-hole transformer (500); S50: Control the electric hoist (200) to lower the right iron core (520).

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