A device for dismounting and mounting bearing pins of power transformation equipment by liquid nitrogen cooling

Abstract

The application relates to the technical field of power maintenance equipment, in particular to a device for dismounting bearing shaft pins of power transformation equipment by using liquid nitrogen cooling technology, which comprises a liquid nitrogen gun power device, a control bin, a lithium battery, a whole-dismountable nitrogen storage module, a buffer pipe and a telescopic fixing support. The control bin and the lithium battery are installed on the liquid nitrogen gun power device. The lithium battery is used for supplying power to the liquid nitrogen gun power device. The control bin is used for adjusting the power outputted by the liquid nitrogen gun power device. The whole-dismountable nitrogen storage module is connected with the control bin. The whole-dismountable nitrogen storage module is installed with a nitrogen storage tank. The nitrogen storage tank is used for storing liquid nitrogen. The whole-dismountable nitrogen storage module is installed with the buffer pipe at the other end. The buffer pipe is connected with the telescopic fixing support at the other end. The extremely low temperature characteristics of the liquid nitrogen are utilized to rapidly cool the bearing to a shrinkage state, so that the safe dismounting of the bearing is easily realized.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power maintenance equipment, in particular to a device for disassembling and assembling bearing shaft pins of power transformation equipment using liquid nitrogen cooling technology. BACKGROUND

[0002] As an important part of the power system, the primary equipment of a substation includes circuit breakers, disconnectors, transformers, and cooling fans, all of which involve the application of a large number of bearings and shaft pins. During operation, these bearings and shaft pins are prone to various defects, such as circuit breaker shaft sleeve wear causing misalignment, disconnector on-off failure, transformer load head cover oil leakage, and cooling fan bearing wear requiring replacement. These defects not only affect the normal operation of the equipment, but also may cause equipment failure and production interruption, increasing maintenance and repair costs.

[0003] Currently, the repair of bearing and shaft pin defects usually requires disassembling related components, especially the transmission shaft and bearings. However, with the improvement of modern equipment processing precision, the bearing gap gradually becomes smaller, which makes the traditional disassembly method face increasing challenges. First, traditional disassembly tools such as pullers cannot effectively adapt to the complex and irregular shape of substation equipment, resulting in low disassembly efficiency and even secondary damage to the bearings. Second, the method of using a sledgehammer to knock the bearings is not only laborious, but also easily causes damage to the equipment itself, further complicating maintenance work.

[0004] Although some specialized equipment such as the "balanced force pressing device" has been developed to solve some disassembly problems, the device is large in size, inconvenient to operate, and may cause new side effects to the equipment during use, especially failing to reduce the friction between the bearing and the shaft seat, thereby reducing the difficulty of disassembly and the risk of equipment damage, affecting the safety and stability of the equipment. SUMMARY

[0005] To address the above problems, a new disassembly method needs to be developed that can effectively improve disassembly efficiency, reduce friction between the bearing and the shaft seat, reduce equipment damage, further optimize the bearing disassembly process, and ensure efficient and safe operation of the substation equipment.

[0006] The device for disassembling and assembling bearing shaft pins of power transformation equipment by liquid nitrogen cooling technology comprises a liquid nitrogen gun power device, a control bin, a lithium battery, a detachable nitrogen storage module, a buffer tube and a telescopic fixing support, the control bin and the lithium battery are installed on the liquid nitrogen gun power device, the lithium battery is used for supplying power for the liquid nitrogen gun power device, and the control bin is used for adjusting the power outputted by the liquid nitrogen gun power device; the detachable nitrogen storage module is connected with the control bin, a nitrogen storage tank is installed on the detachable nitrogen storage module, and the nitrogen storage tank is used for storing liquid nitrogen; the detachable nitrogen storage module is provided with the buffer tube at the other end, the buffer tube is connected with the telescopic fixing support at the other end, the telescopic fixing support is provided with a low-temperature sleeve head at the other end, the low-temperature sleeve head is used for contacting and exchanging heat with the bearing shaft pin to be disassembled and assembled, and the buffer tube is used for buffering the flow rate of the liquid nitrogen from the nitrogen storage tank to the low-temperature sleeve head; the buffer tube and the low-temperature sleeve head are communicated, a press switch for opening and closing the communication relationship between the buffer tube and the low-temperature sleeve head is arranged, and the telescopic fixing support is used for adjusting the contact position of the low-temperature sleeve head and the bearing shaft pin to be disassembled and assembled.

[0007] The telescopic fixing support comprises a cylinder, the cylinder is detachably connected with the buffer tube and the low-temperature sleeve head through telescopic screw caps, the cylinder is connected with the buffer tube and the low-temperature sleeve head at two ends respectively, a thread is arranged on the outer wall of the cylinder, a sliding ring is rotatably connected on the thread, a plurality of hinge seats are uniformly distributed on the sliding ring, a sliding rod is rotatably connected on each hinge seat, a sliding groove is arranged on the sliding rod along the length direction, a fixed ring is fixedly installed on the side of the cylinder away from the telescopic screw cap, a plurality of fork-shaped mounting seats corresponding to the hinge seats are arranged on the fixed ring, a limiting pin is arranged on each fork-shaped mounting seat and passes through the corresponding sliding groove, and a barb claw with a direction of mutual centripetal force is arranged on the end of each sliding rod away from the hinge seat.

[0008] Preferably, the outer layer of the nitrogen storage tank is provided with a heat insulation material.

[0009] Preferably, the buffer tube is provided with a temperature insulation layer outside.

[0010] Preferably, the low-temperature sleeve head is in the shape of a horn mouth cover.

[0011] Preferably, a graphene heat conduction layer for increasing the contact area of the bearing shaft pin to be disassembled and assembled is arranged in the low-temperature sleeve head.

[0012] Preferably, the control bin is a multi-stage adjustment.

[0013] Preferably, a plurality of elastic bandages are arranged outside the sliding rods and used for folding the sliding rods inward.

[0014] Compared with the prior art, the device has the following beneficial effects:

[0015] 1. Utilize the extremely low temperature characteristics of liquid nitrogen to quickly cool the bearing to a shrinkage state, effectively reduce the interference fit force between the bearing and the shaft pin, so as to easily realize the safe disassembly of the bearing, and solve the problem of difficult disassembly caused by insufficient or uneven mechanical force in the traditional method.

[0016] 2. Precise operation is realized, and various devices are adapted: a telescopic fixing support and a telescopic cap are designed, so that the application can adapt to bearings of different sizes and different types, ensure that the low-temperature sleeve head is aligned with the target part of the bearing, realize precise cooling and efficient disassembly, and improve the applicability of the device, which can be widely applied to various power transformation devices. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the drawings needed in the specific embodiments or the prior art description will be briefly introduced below; in all the drawings, similar elements or parts are generally identified by similar reference numerals; in the drawings, each element or part is not necessarily drawn according to the actual proportion.

[0018] Figure 1 is a perspective view of the application;

[0019] Figure 2 is a telescopic fixing support structure schematic diagram.

[0020] In the figure: 1, liquid nitrogen gun power device; 2, control bin; 3, lithium battery; 4, integral detachable nitrogen storage module; 5, nitrogen storage tank; 6, buffer tube; 7, press switch; 8, temperature insulation layer; 9, telescopic fixing support; 10, telescopic cap; 11, thread; 12, sliding ring; 13, sliding rod; 14, sliding groove; 15, fixed ring; 16, low-temperature sleeve head; 17, barb claw; 18, graphene heat conduction layer; 19, limit pin; 20, fork mounting seat. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application;

[0022] The drawings will be described below in combination with the Figure 1 and Figure 2The application discloses a device for disassembling and assembling bearing shaft pins of power transformation equipment by using liquid nitrogen cooling technology, and belongs to the technical field of power transformation equipment.

[0023] The telescopic fixing support 9 comprises a cylinder body, the cylinder body is detachably connected with the buffer pipe 6 through a telescopic screw cap 10, detachable connection provides flexibility of installation, different types, different models and sizes of telescopic fixing supports 9 can be quickly replaced on the buffer pipe 6, the cylinder body is connected with the buffer pipe 6 and the low-temperature sleeve head 16 at two ends respectively, a thread 11 is arranged on the outer wall of the cylinder body, a sliding ring 12 is rotationally connected on the thread 11, a plurality of hinged seats are uniformly distributed on the sliding ring 12, a sliding rod 13 is rotationally connected on each hinged seat, a sliding groove 14 is arranged on the sliding rod 13 along the length direction, a fixed ring 15 is fixedly installed on the side of the cylinder body away from the telescopic screw cap 10, a plurality of fork-shaped mounting seats 20 corresponding to the hinged seats are arranged on the fixed ring 15, a limiting pin 19 is arranged on each fork-shaped mounting seat 20 and passes through the corresponding sliding groove 14, and a barb claw 17 is arranged at the end of each sliding rod 13 away from the hinged seat and is directed to the center of the barb claw 17.

[0024] As a preferred scheme, the outer layer of the nitrogen storage tank 5 should be provided with heat insulation material to prevent frostbite of the operator, the nitrogen storage tank 5 is a replaceable consumable which is frequently replaced, and the heat insulation material should be rigid, for example, a double-layer aluminum plate provided with a filler such as asbestos and rock wool in the inside.

[0025] The buffer pipe 6 is provided with a temperature insulation layer 8 on the outer side, so as to prevent frostbite of the operator, here is a position frequently held, and synthetic cloth filled with cotton, hollow resin and other materials can be preferably used to realize temperature insulation, improve holding efficiency and avoid frostbite.

[0026] The low-temperature sleeve head 16 is a bell mouth cover structure, which utilizes the Bernoulli principle to change the cross-section from small to large, increase the cross-section at the outlet position, reduce the flow rate of the gaseous liquid nitrogen on the side of the low-temperature sleeve head 16, reduce the recoil force generated thereby, and improve the safety of the operation.

[0027] The low-temperature sleeve head 16 is provided with a graphene heat-conducting layer 18 that increases the contact area with the bearing shaft pin to be disassembled.

[0028] The control bin 2 is a multi-stage adjustment, and in some embodiments, the control bin 2 can be a multi-gear adjustment to adapt to different environments or different bearing shaft pins to be disassembled.

[0029] The plurality of sliding rods 13 are externally provided with elastic bandages for folding all the sliding rods 13 inward, which can reduce the activity allowance between the sliding rods 13 and the limiting pins 19, maintain a relatively stable fitting state, and avoid abnormal noise and looseness.

[0030] In actual use, according to the style of Figure 1 , all the components are assembled, the sliding ring 12 is rotated to one side of the low-temperature sleeve head 16, the plurality of sliding rods 13 diverge outward from the end away from the sliding ring 12, until the outline formed by the outer edges of the outwardly opened sliding rods 13 can completely cover the bearing shaft pin to be disassembled, at this time, the graphene heat-conducting layer 18 is attached to the bearing shaft pin to be disassembled, then the sliding ring 12 is rotated to one side of the telescopic screw cap 10, the plurality of sliding rods 13 converge inward from the end away from the sliding ring 12, until the barb claws 17 on the outer edges of the sliding rods 13 attach and compress the bearing shaft pin to be disassembled and the graphene heat-conducting layer 18, at this time, the gear of the control bin 2 is selected, the press switch 7 is started, at this time, the low-temperature sleeve head 16 and the buffer tube 6 are connected, at this time, the liquid nitrogen gun power device 1 is started, the liquid nitrogen gun power device 1 transmits the liquid nitrogen in the storage tank 5 to the low-temperature sleeve head 16, at this time, the low-temperature liquid nitrogen cools the bearing shaft pin to be disassembled, and under the effect of thermal expansion and cold contraction, the bearing shaft pin to be disassembled is reduced to a disassembled state that is more suitable for interference fit. After the operation is completed, the press switch 7 and the liquid nitrogen gun power device 1 are turned off in turn. The sliding ring 12 is rotated to one side of the low-temperature sleeve head 16, the plurality of sliding rods 13 diverge outward from the end away from the sliding ring 12, until the outline formed by the outer edges of the outwardly opened sliding rods 13 can completely cover the bearing shaft pin to be disassembled, at this time, the attachment state of the bearing shaft pin to be disassembled and the graphene heat-conducting layer 18 can be released, then the telescopic fixed support 9 is removed from the buffer tube 6 through the telescopic screw cap 10, the buffer tube 6 is removed from the integrally detachable storage module 4, the storage tank 5 on the integrally detachable storage module 4 is removed, the integrally detachable storage module 4 is removed from the liquid nitrogen gun power device 1, and finally the lithium battery 3 is removed. Thus, the disassembly is completed, and the components disassembled in each step are stored for convenient carrying.

[0031] It should be understood that, when used in this specification and the appended claims, the terms “comprising” and “including” indicate the presence of the described features, integrals, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or collections thereof.

[0032] It should also be understood that the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the invention; as used in this specification and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise.

[0033] It should also be further understood that the term "and / or" as used in this specification and the appended claims refers to any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

Claims

1. A device for dismounting a bearing pin of a power transformation equipment using liquid nitrogen cooling technology, characterized in that: The application relates to a liquid nitrogen gun power device (1), a control bin (2), a lithium battery (3), a detachable nitrogen storage module (4), a buffer tube (6) and a telescopic fixing support (9), wherein the liquid nitrogen gun power device (1) is provided with the control bin (2) and the lithium battery (3); the lithium battery (3) is used for supplying power to the liquid nitrogen gun power device (1); the control bin (2) is used for adjusting the power outputted by the liquid nitrogen gun power device (1); the control bin (2) is connected with the detachable nitrogen storage module (4); the detachable nitrogen storage module (4) is provided with a nitrogen storage tank (5); the nitrogen storage tank (5) is used for storing liquid nitrogen; one end of the detachable nitrogen storage module (4) is provided with the buffer tube (6); the other end of the buffer tube (6) is connected with the telescopic fixing support (9); the other end of the telescopic fixing support (9) is provided with a low-temperature sleeve head (16) used for contacting and heat exchanging with a bearing shaft pin to be disassembled; the buffer tube (6) is used for buffering the flow rate of the liquid nitrogen from the nitrogen storage tank (5) to the low-temperature sleeve head (16); the buffer tube (6) and the low-temperature sleeve head (16) are communicated; a press switch (7) used for switching the communication relationship is arranged between the buffer tube (6) and the low-temperature sleeve head (16); the telescopic fixing support (9) is used for adjusting the contact position of the low-temperature sleeve head (16) and the bearing shaft pin to be disassembled; the telescopic fixing support (9) comprises a cylinder body; the cylinder body is detachably connected with the buffer tube (6) through a telescopic rotating cap (10); the two ends of the cylinder body are connected with the buffer tube (6) and the low-temperature sleeve head (16) respectively; a screw thread (11) is arranged on the outer wall of the cylinder body; a sliding ring (12) is rotatably connected on the screw thread (11); a plurality of hinged seats are uniformly distributed on the sliding ring (12); a sliding rod (13) is rotatably connected on each hinged seat; a sliding groove (14) is arranged on the sliding rod (13) along the length direction; a fixing ring (15) is fixedly arranged on the side of the cylinder body away from the telescopic rotating cap (10); a plurality of fork-shaped mounting seats (20) corresponding to the hinged seats are arranged on the fixing ring (15); a limiting pin (19) passing through the corresponding sliding groove (14) is arranged on each fork-shaped mounting seat (20); and a barb claw (17) with a direction of mutual centripetal force is arranged on the end of each sliding rod (13) away from the hinged seat.

2. The device for disassembling the bearing shaft pin of the power transformation equipment by liquid nitrogen cooling technology according to claim 1, characterized in that: The outer layer of the nitrogen storage tank (5) is provided with a heat insulation material.

3. The device for disassembling the bearing shaft pin of the power transformation equipment by liquid nitrogen cooling technology according to claim 1, characterized in that: The outer side of the buffer tube (6) is provided with a temperature insulation layer (8).

4. The device for dismounting the bearing shaft pin of the power transformation equipment by liquid nitrogen cooling technology according to claim 1, characterized in that: The low-temperature sleeve head (16) is in a trumpet mouth cover structure.

5. The device for disassembling the bearing shaft pin of the power transformation equipment by liquid nitrogen cooling technology according to claim 1, characterized in that: The low-temperature sleeve head (16) is provided with a graphene heat conduction layer (18) for increasing the contact area of the bearing shaft pin to be disassembled.

6. The device for dismounting the bearing shaft pin of the power transformation equipment according to claim 1 or 4, characterized in that: The control bin (2) is a multi-stage adjustment.

7. The device for disassembling the bearing shaft pin of the power transformation equipment by liquid nitrogen cooling technology according to claim 1, characterized in that: The outer part of the plurality of sliding rods (13) is provided with an elastic bandage for folding all the sliding rods (13) inward.

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