Movable type steel rail welded joint subzero treatment device and using method thereof

Abstract

The invention relates to the field of steel rail welded joint heat treatment processes, and particularly discloses a movable steel rail welded joint subzero treatment device and a using method thereof, and the movable steel rail welded joint subzero treatment device comprises a subzero device, a carrying carrier and an intelligent feeding device. According to the method, the cryogenic devices are fixed to the steel rail welding seam position, liquid nitrogen in the liquid nitrogen tank is introduced into the liquid filling cavities in the cryogenic devices on the two sides under the pressure effect for cryogenic treatment, the liquid nitrogen is recycled after treatment is completed, and the cryogenic devices and the connecting channel are detached and placed on the carrying carrier for cryogenic treatment of the next welding seam position; therefore, the subzero treatment method for the movable steel rail welded joint is achieved. The device has the advantages that the device is convenient to carry and can move on the upper surface of the steel rail, liquid nitrogen can be intelligently fed in the treatment process, the liquid nitrogen can be recycled and reutilized, the mechanical property is obviously improved after subzero treatment, and the wear resistance and the fatigue resistance of a welding joint are obviously enhanced.

Description

Technical Field

[0001] The invention relates to the technical field of rail weld joint treatment technology, and in particular to a mobile rail weld joint cryogenic treatment device and a use method thereof. Background Art

[0002] At present, cryogenic treatment is mainly used for: 1. Improvement of cryogenic treatment process methods, such as: innovative methods such as cryogenic treatment steps and temperature control methods for specific materials; 2. Improvement of cryogenic treatment equipment, such as: new cryogenic treatment equipment structure design, refrigeration system improvement, etc.; 3. Cryogenic treatment combined with other technologies, such as: innovative applications combined with other processes such as heat treatment and surface treatment; 4. Cryogenic treatment optimization solutions for specific materials, such as: unique solutions for cryogenic treatment of one or several special materials; 5. Aspects related to performance improvement after cryogenic treatment, such as: how to significantly improve certain properties of materials or products through cryogenic treatment; 6. Cryogenic treatment automatic control technology related, such as: technology for realizing automatic control and precise regulation of cryogenic treatment process; However, there is no existing technology that combines specific equipment to directly apply cryogenic treatment to actual materials and improve their performance.

[0003] To this end, the present invention provides a mobile rail weld joint cryogenic treatment device and a use method thereof, which utilizes a cryogenic treatment chamber to perform cryogenic treatment on the rail weld joint. Summary of the invention

[0004] The purpose of the present invention is to provide a mobile rail weld joint cryogenic treatment device and a method of using the same to solve the problems existing in the above-mentioned prior art.

[0005] To achieve the above object, the present invention provides a mobile rail weld joint cryogenic treatment device, comprising:

[0006] A cryogenic device, which is an open-and-close structure and is used to cover the rail welding joint. A liquid-filled cavity for containing a cooling medium is provided inside the cryogenic device;

[0007] an intelligent feeding device, the intelligent feeding device being in communication with the cryogenic device via a connecting channel, the intelligent feeding device being used to supply cooling medium to the cryogenic device, and the intelligent feeding device being used to adjust a liquid level difference between the intelligent feeding device and the cryogenic device;

[0008] A transport vehicle, wherein the transport vehicle is used to move on the upper surface of the rail, and the intelligent shrinkage feeding device is installed on the transport vehicle.

[0009] Preferably, the cryogenic device comprises:

[0010] A cryogenic treatment chamber, the cryogenic treatment chamber is connected to the intelligent feeding device through a connecting channel, an opening is provided at the top of the cryogenic treatment chamber, a cover structure for sealing the opening is threadedly connected to the opening, and a cryogenic insulation layer is provided on the inner wall of the cryogenic treatment chamber;

[0011] An opening and closing mechanism, the opening and closing mechanism is installed on the cryogenic treatment chamber, and the opening and closing mechanism is used to realize the opening and closing of the cryogenic treatment chamber to the left and right;

[0012] A laser signal source is fixedly installed in the cryogenic insulation layer, and is used to monitor the liquid level of the cooling medium in the cryogenic treatment chamber.

[0013] Preferably, a heat-insulating material is provided between the cryogenic insulation layer and the outer wall of the cryogenic treatment chamber.

[0014] Preferably, the material of the cryogenic insulation layer is polychlorotrifluoroethylene.

[0015] Preferably, the intelligent feeding device comprises:

[0016] A liquid nitrogen tank, which is disposed on the carrier and is used to transport liquid nitrogen into the liquid filling chamber of the cryogenic device through the connecting channel;

[0017] A motor, wherein the motor is installed at the bottom of the liquid nitrogen tank, a lifting structure is provided inside the liquid nitrogen tank, and the motor is in transmission cooperation with the lifting structure;

[0018] A liquid level sensor is installed on the top of the outer wall of the liquid nitrogen tank, the motor is electrically connected to the liquid level sensor, and the laser signal source is electrically connected to the liquid level sensor.

[0019] Preferably, the motor is a small rechargeable motor.

[0020] Preferably, the transport vehicle comprises:

[0021] A cart, the cart being used to hold the liquid nitrogen tank;

[0022] A detachable supporting structure is symmetrically arranged on both sides of the cart, and the detachable supporting structure includes two support rods detachably mounted on the cart, a fixing rod is fixedly connected between the two support rods, an end of the support rod away from the cart is fixedly connected to a limiting rod, and a wheel is fixedly mounted on the bottom of one end of the support rod close to the limiting rod, and the cart moves on the upper surface of the rail via the wheels.

[0023] Preferably, the connecting channel comprises:

[0024] A connecting pipe, the connecting pipe is used to connect the cryogenic treatment chamber with the liquid nitrogen tank;

[0025] A rotating mechanism, which is installed at both ends of the connecting pipe, and is used to adjust the height of the connecting pipe, and an antifreeze material is provided on the outside of the rotating mechanism;

[0026] A switch mechanism is installed in the middle of the connecting pipe, and is used to control the flow rate of liquid nitrogen.

[0027] Preferably, the connecting pipe is a double-layer copper pipe, and the space between the double-layer copper pipes is filled with sealing and heat-insulating materials.

[0028] The method for using the mobile rail welding joint cryogenic treatment device comprises the following steps:

[0029] Move the cryogenic device to the rail weld position by means of a carrier, fix the cryogenic device on the rail, and connect the cryogenic device with the intelligent feeding device through a connecting channel;

[0030] Liquid nitrogen is introduced into the liquid filling chamber inside the cryogenic device through the intelligent feeding device to perform cryogenic treatment on the rail weld;

[0031] After the cryogenic treatment is completed, the liquid nitrogen inside the cryogenic device is recovered using an intelligent feeding device;

[0032] The cryogenic device and connecting channel are disassembled and placed on a transport vehicle, and the transport vehicle is used to move the cryogenic device to the next rail weld position, and the above operation is repeated.

[0033] Compared with the prior art, the present invention has the following advantages and technical effects:

[0034] The mobile rail weld joint cryogenic treatment device provided by the present invention is easy to carry and can be moved on the upper surface of the rail. Liquid nitrogen can be intelligently supplemented during the treatment process, and the liquid nitrogen can be recovered and reused. After the cryogenic treatment, the mechanical properties are significantly improved, and the wear resistance and fatigue resistance of the weld joint are significantly enhanced. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0036] Figure 1 It is a structural schematic diagram of a mobile rail welding joint cryogenic treatment device of the present invention;

[0037] Figure 2It is a schematic diagram of the structure of the carrier of the present invention;

[0038] Figure 3 It is a structural schematic diagram of the cryogenic treatment chamber of the present invention;

[0039] In the figure: 101, cryogenic treatment chamber; 102, opening and closing mechanism; 103, laser signal source; 104, cryogenic insulation layer; 105, grooved connecting seat; 106, connecting rod; 107, grooved support; 201, connecting pipe; 202, rotating mechanism; 203, switching mechanism; 204, end of connecting pipe; 205, spherical connecting pipe; 206, tail of connecting pipe; 301, liquid nitrogen tank; 302, motor; 303, liquid level sensor; 304, lifting structure; 305, lifting screw rod; 306, circular lifting platform; 401, cart; 402, detachable supporting structure; 403, supporting rod; 404, fixing rod; 405, wheel; 406, limiting rod. DETAILED DESCRIPTION

[0040] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other. The described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. The present invention will be described in detail below with reference to the drawings and in combination with the embodiments.

[0041] like Figures 1 to 3 As shown, the present invention provides a mobile rail weld joint cryogenic treatment device, comprising:

[0042] A cryogenic device, which is an open-and-close structure, is used to cover the rail welding joint, and a liquid-filled cavity for containing a cooling medium is provided inside the cryogenic device;

[0043] An intelligent feeding device, the intelligent feeding device is connected to the cryogenic device through a connecting channel, the intelligent feeding device is used to supply cooling medium to the cryogenic device, and the intelligent feeding device is used to adjust the liquid level difference between the intelligent feeding device and the cryogenic device;

[0044] The transport vehicle is used to move on the upper surface of the rail, and the intelligent shrinkage feeding device is installed on the transport vehicle.

[0045] To further optimize the solution, in order to facilitate the installation of the cryogenic device at the weld of the rail, the cryogenic device includes:

[0046] A cryogenic treatment chamber 101, which is connected to the intelligent feeding device through a connecting channel. An opening is provided at the top of the cryogenic treatment chamber 101, and a cover structure for sealing the opening is threadedly connected to the opening. A cryogenic insulation layer 104 is provided on the inner wall of the cryogenic treatment chamber 101;

[0047] An opening and closing mechanism 102, which is installed on the cryogenic treatment chamber 101, and uses a connecting rod to realize the left and right opening and closing of the cryogenic treatment chamber 101;

[0048] There are two sets of opening and closing mechanisms 102, which are respectively arranged on the upper end surface of the cryogenic treatment chamber 101. Each set of opening and closing mechanisms 102 includes a groove-shaped support 107 welded on one side of the cryogenic treatment chamber 101, a connecting rod 106 is hinged on the groove-shaped support, and a groove-shaped connecting seat 105 is welded at the corresponding connecting rod 106 on the other side of the cryogenic treatment chamber 101. The left and right opening and closing of the cryogenic treatment chamber 101 is realized by the cooperation between the connecting rod 106 and the groove-shaped connecting seat 105;

[0049] The laser signal source 103 is fixedly installed in the cryogenic insulation layer 104 . The laser signal source 103 is used to monitor the liquid level of the cooling medium in the cryogenic treatment chamber 101 .

[0050] According to a further optimization scheme, in order to ensure the stability of the temperature in the cryogenic treatment chamber 101 , a heat-insulating material is provided between the cryogenic insulation layer 104 and the outer wall of the cryogenic treatment chamber 101 .

[0051] According to a further optimization scheme, the material of the cryogenic insulation layer 104 is polychlorotrifluoroethylene.

[0052] Further optimizing the scheme, in order to facilitate the control of the liquid level of liquid nitrogen in the cryogenic treatment chamber 101 and to facilitate the supply and recovery of liquid nitrogen in the cryogenic treatment chamber 101, the intelligent feeding device includes:

[0053] Liquid nitrogen tank 301, which is disposed on the carrier and is used to transport liquid nitrogen into the liquid filling chamber of the cryogenic device through a connecting channel;

[0054] The motor 302 is installed at the bottom of the liquid nitrogen tank 301. A lifting structure 304 is provided inside the liquid nitrogen tank 301. The motor 302 cooperates with the lifting structure 304 in transmission;

[0055] The lifting structure 304 is composed of a lifting screw 305 and a circular lifting platform 306. The lifting screw 305 is engraved with threads, and a nut is embedded with threads matching the threads of the lifting screw 305. The nut is fixed to the bottom surface of the circular lifting platform 306. Under the action of the motor 302, the lifting screw 305 rotates, and the nut drives the circular lifting platform 306 to move up and down along the axial direction of the lifting screw 305. The lifting height is affected by the height of the nut.

[0056] The liquid level sensor 303 is installed on the top of the outer wall of the liquid nitrogen tank 301 , the motor 302 is electrically connected to the liquid level sensor 303 , and the laser signal source 103 is electrically connected to the liquid level sensor 303 .

[0057] After receiving the signal transmitted by the laser signal source 103 in the cryogenic treatment chamber 101, the liquid level sensor 303 controls the start of the motor 302, thereby using the motor 302 to drive the lifting structure 304 to move up and down. The lifting structure 304 is a piston lifting mechanism, which facilitates the control of the liquid nitrogen level in the liquid nitrogen tank 301.

[0058] According to a further optimization scheme, the motor 302 is a small rechargeable motor.

[0059] To further optimize the solution, in order to facilitate the movement of the intelligent feeding device and the cryogenic device, the transport vehicle includes:

[0060] A cart 401, which is used to hold the liquid nitrogen tank 301;

[0061] A detachable support structure 402 is symmetrically arranged on both sides of the cart 401. The detachable support structure 402 includes two support rods 403 that are detachably installed on the cart 401. A fixing rod 404 is fixedly connected between the two support rods 403. One end of the support rod 403 away from the cart 401 is fixedly connected to a limiting rod 406. A wheel 405 is fixedly installed at the bottom of one end of the support rod 403 close to the limiting rod 406. The cart 401 moves on the upper surface of the rail through the wheel 405.

[0062] The limiting rod 406 has a limiting function, so that the wheel 405 always moves on the upper surface of the rail, and the fixing rod 404 has a fastening function, so as to maintain the stability between the two supporting rods 403.

[0063] To further optimize the solution, the connection channels include:

[0064] A connecting pipe 201, which is used to connect the cryogenic treatment chamber 101 with the liquid nitrogen tank 301. One end of the connecting pipe 201 is connected to the bottom of the cryogenic treatment chamber 101, and the other end of the connecting pipe 201 is connected to the middle of the liquid nitrogen tank 301, so that the liquid nitrogen in the liquid nitrogen tank 301 and the liquid nitrogen in the cryogenic treatment chamber 101 can form a height difference under the action of the lifting structure 304;

[0065] A rotating mechanism 202, which is installed at both ends of the connecting pipe 201, and is used to adjust the height of the connecting pipe 201, and an antifreeze material is provided on the outside of the rotating mechanism 202;

[0066] The rotating mechanism 202 includes a connecting tube end 204, a spherical connecting tube 205 and a connecting tube tail 206. The connecting tube end 204 and the connecting tube tail 206 are both cylindrical. The connecting tube end 204 is connected to the cryogenic treatment chamber 101, and the connecting tube tail 206 is connected to the switch mechanism 203. The connecting tube end 204 and the connecting tube tail 206 are connected by a spherical connecting tube 205 whose outer surface is spherical. The spherical connecting tube 205 can make the connecting tube end 204 and the connecting tube tail 206 rotate around within a limited range.

[0067] The switch mechanism 203 is installed in the middle of the connecting pipe 201 and is used to control the flow rate of the liquid nitrogen.

[0068] A further optimized solution is that the connecting pipe 201 is a double-layer copper pipe, and the space between the double-layer copper pipes is filled with sealing and heat-insulating materials.

[0069] The method for using the mobile rail weld joint cryogenic treatment device provided by the present invention comprises the following steps:

[0070] Move the cryogenic device to the rail weld position by means of a carrier, fix the cryogenic device on the rail, and connect the cryogenic device with the intelligent feeding device through a connecting channel;

[0071] Liquid nitrogen is introduced into the liquid filling chamber inside the cryogenic device through the intelligent feeding device to perform cryogenic treatment on the rail weld;

[0072] After the cryogenic treatment is completed, the liquid nitrogen inside the cryogenic device is recovered using an intelligent feeding device;

[0073] The cryogenic device and connecting channel are disassembled and placed on a transport vehicle, and the transport vehicle is used to move the cryogenic device to the next rail weld position, and the above operation is repeated.

[0074] Example

[0075] Taking U75V rail as an example, the test results are as follows:

[0076] After cryogenic treatment, its hardness increased from 33.6±2.4HRC to 39.5±2.7HRC, an increase of 17.56%, and its tensile strength increased from 1060±10MPa to 1254±12MPa, an increase of 18.30%.

[0077] After rolling wear for 2 hours under a load of 200N, the weight loss of the welded joint sample was 16.37mg. After cryogenic treatment, the weight loss was 13.72mg, a decrease of about 16.19%, indicating that cryogenic treatment can greatly enhance the wear resistance of U75V rail welded joints.

[0078] The above are only preferred specific implementations of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by any technician familiar with the technical field within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention.

Claims

1. A mobile rail weld joint cryogenic treatment device, characterized in that: include: A cryogenic device, which is an open-and-close structure and is used to cover the rail welding joint. A liquid-filled cavity for containing a cooling medium is provided inside the cryogenic device; an intelligent feeding device, the intelligent feeding device being in communication with the cryogenic device via a connecting channel, the intelligent feeding device being used to supply cooling medium to the cryogenic device, and the intelligent feeding device being used to adjust a liquid level difference between the intelligent feeding device and the cryogenic device; A transport vehicle, wherein the transport vehicle is used to move on the upper surface of the rail, and the intelligent shrinkage feeding device is installed on the transport vehicle.

2. The mobile rail weld joint cryogenic treatment device according to claim 1, characterized in that: The cryogenic device comprises: A cryogenic treatment chamber (101), the cryogenic treatment chamber (101) being connected to the intelligent feeding device via a connecting channel, an opening being arranged at the top of the cryogenic treatment chamber (101), a cover structure being threadedly connected to the opening for sealing the opening, and a cryogenic insulation layer (104) being arranged on the inner wall of the cryogenic treatment chamber (101); An opening and closing mechanism (102), the opening and closing mechanism (102) being installed on the cryogenic treatment chamber (101), the opening and closing mechanism (102) being used to realize the opening and closing of the cryogenic treatment chamber (101) to the left and right; A laser signal source (103), the laser signal source (103) is fixedly installed in the cryogenic insulation layer (104), and the laser signal source (103) is used to monitor the liquid level of the cooling medium in the cryogenic treatment chamber (101).

3. The mobile rail weld joint cryogenic treatment device according to claim 2, characterized in that: A heat-insulating material is provided between the cryogenic heat-insulating layer (104) and the outer wall of the cryogenic treatment chamber (101).

4. The mobile rail weld joint cryogenic treatment device according to claim 2, characterized in that: The material of the deep-cold thermal insulation layer (104) is polychlorotrifluoroethylene.

5. The mobile rail weld joint cryogenic treatment device according to claim 2, characterized in that: The intelligent feeding device comprises: a liquid nitrogen tank (301), the liquid nitrogen tank (301) being arranged on the carrier, and the liquid nitrogen tank (301) being used to transport liquid nitrogen into the liquid filling cavity of the cryogenic device through the connecting channel; A motor (302), wherein the motor (302) is installed at the bottom of the liquid nitrogen tank (301), a lifting structure (304) is provided inside the liquid nitrogen tank (301), and the motor (302) is in transmission cooperation with the lifting structure (304); A liquid level sensor (303), wherein the liquid level sensor (303) is installed on the top of the outer wall of the liquid nitrogen tank (301), the motor (302) is electrically connected to the liquid level sensor (303), and the laser signal source (103) is electrically connected to the liquid level sensor (303).

6. The mobile rail weld joint cryogenic treatment device according to claim 5, characterized in that: The motor (302) is a small rechargeable motor.

7. The mobile rail weld joint cryogenic treatment device according to claim 5, characterized in that: The carrier includes: A cart (401), wherein the cart (401) is used to hold the liquid nitrogen tank (301); A detachable support structure (402) is symmetrically arranged on both sides of the cart (401), and the detachable support structure (402) includes two support rods (403) detachably mounted on the cart (401), a fixing rod (404) is fixedly connected between the two support rods (403), one end of the support rod (403) away from the cart (401) is fixedly connected to a limiting rod (406), and a wheel (405) is fixedly mounted on the bottom of one end of the support rod (403) close to the limiting rod (406), and the cart (401) moves on the upper surface of the rail through the wheel (405).

8. The mobile rail weld joint cryogenic treatment device according to claim 5, characterized in that: The connection channel comprises: A connecting pipe (201), the connecting pipe (201) being used to connect the cryogenic treatment chamber (101) and the liquid nitrogen tank (301); A rotating mechanism (202), the rotating mechanism (202) being installed at both ends of the connecting pipe (201), the rotating mechanism (202) being used to adjust the height of the connecting pipe (201), and an antifreeze material being arranged on the outside of the rotating mechanism (202); A switch mechanism (203), wherein the switch mechanism (203) is installed in the middle of the connecting pipe (201), and the switch mechanism (203) is used to control the flow rate of liquid nitrogen.

9. The mobile rail weld joint cryogenic treatment device according to claim 8, characterized in that: The connecting pipe (201) is a double-layer copper pipe, and the space between the double-layer copper pipes is filled with sealing and heat-insulating materials.

10. The method for using the mobile rail weld joint cryogenic treatment device according to any one of claims 1 to 9, characterized in that: The following steps are involved: Move the cryogenic device to the rail weld position by means of a carrier, fix the cryogenic device on the rail, and connect the cryogenic device with the intelligent feeding device through a connecting channel; Liquid nitrogen is introduced into the liquid filling chamber inside the cryogenic device through the intelligent feeding device to perform cryogenic treatment on the rail weld; After the cryogenic treatment is completed, the liquid nitrogen inside the cryogenic device is recovered using an intelligent feeding device; The cryogenic device and connecting channel are disassembled and placed on a transport vehicle, and the transport vehicle is used to move the cryogenic device to the next rail weld position, and the above operation is repeated.

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