Rail lifting mechanism, clamping mechanism of rail lifting mechanism, welding machine head and steel rail flash welding machine

Abstract

The utility model discloses a rail lifting mechanism which is arranged on a corresponding wedge-shaped piece and comprises a lifting top block and a jacking assembly, and at least part of the lifting top block is arranged on the outer upper portion of the wedge-shaped piece in a sliding mode in the vertical direction and used for abutting against the top of the inner side of a steel rail. The jacking assembly is arranged on the wedge-shaped piece, connected with the lifting jacking block and used for driving the lifting jacking block to move between a preset first position and a preset second position. Compared with the prior art, in the process that the wedge-shaped piece clamps the steel rail, the rail lifting mechanism starts to lift the jacking block to a preset first position, then the jacking assembly drives the lifting jacking block to move upwards, and the top of the lifting jacking block abuts against the top of the inner side of the steel rail, so that the steel rail is jacked to a preset second position; and the steel rail is accurately clamped by the wedge-shaped piece at the preset second position, so that the adjustment time during alignment of the steel rail is shortened.

Description

Technical Field

[0001] The utility model relates to the technical field of rail flash welding machines, in particular to a rail lifting mechanism, its clamping mechanism, a welding machine head and a rail flash welding machine. Background Art

[0002] As an important component in railway lines, turnouts play a crucial role in railway transportation safety. Since the major railway speed increase in the 1990s, seamless railway technologies have been widely adopted in China's railways. Among them, flash welding and gas pressure welding technologies are mainly used for the welding of main line rails. Due to structural and material limitations of railway turnouts, the connections between various components and the connection with the main line still adopt thermite welding or fishplate bolt connection methods. The quality of thermite welding is unstable, the joint strength is low, and defects such as pores and slag inclusions are likely to occur, seriously affecting the service life of turnouts. Currently, it has become one of the weakest links in line quality and operation safety.

[0003] Flash welding is one of the most stable and widely used rail welding technologies. Its principle is to use resistance heating to melt the metal at the end of the joint, and then connect the two rails into a whole by applying pressure for upsetting. For example, a railway turnout flash welding machine head disclosed in CN117961244A includes two static frame wedge clamps arranged oppositely, two moving frame wedge clamps arranged oppositely, two upsetting cylinders arranged oppositely, a first clamping cylinder, a second clamping cylinder, and a central shaft. Among them: the upsetting cylinder includes an upsetting cylinder body and a piston rod drivingly connected to the upsetting cylinder body. The upsetting cylinder body is installed on the static frame wedge clamp, and the piston rod is connected to the moving frame wedge clamp to drive the reciprocating movement of the moving frame wedge clamp; the first clamping cylinder includes a first clamping cylinder body and a first telescopic rod drivingly connected to the first clamping cylinder body. The first clamping cylinder body is installed on the central shaft, and the upper ends of the two static frame wedge clamps are symmetrically installed on the first telescopic rod. The first telescopic rod is telescopically arranged in a direction perpendicular to the central shaft; the second clamping cylinder includes a second clamping cylinder body and a second telescopic rod drivingly connected to the second clamping cylinder body. The second clamping cylinder body is installed on the central shaft, and the upper ends of the two moving frame wedge clamps are symmetrically installed on the second telescopic rod. The second telescopic rod is telescopically arranged in a direction perpendicular to the central shaft; the central shaft passes through the two static frame wedge clamps and the two moving frame wedge clamps respectively, so that the two static frame wedge clamps and the two moving frame wedge clamps can be rotatably installed on the central shaft; the lower end of the static frame wedge clamp includes a first wedge, and the lower end of the moving frame wedge clamp includes a second wedge. The two first wedges are used to clamp or loosen the first rail, and the two second wedges are used to clamp or loosen the second rail.

[0004] Since the steel rail is in the shape of an I-beam, it is necessary for two first wedge-shaped members or two second wedge-shaped members to precisely align with the neck of the steel rail before stable clamping can be carried out, which is beneficial to improving the welding accuracy between the subsequent two steel rails. However, the above structure requires repeated adjustment of the clamping position during the clamping process of the steel rail, resulting in relatively low clamping efficiency. Summary of the Invention

[0005] Aiming at the deficiencies in the prior art, the purpose of the present invention is to provide a rail lifting mechanism, its clamping mechanism, a welding machine head, and a flash butt welding machine for steel rails, so as to solve the problem in the prior art that during the clamping process of the existing wedge-shaped members on the steel rail, the clamping position is repeatedly adjusted, resulting in relatively low clamping efficiency.

[0006] To achieve the above purpose, the first aspect of the present invention adopts the following technical solution: A rail lifting mechanism is provided on the corresponding wedge-shaped member, including:

[0007] A lifting top block, at least part of which is slidably arranged above the outer side of the wedge-shaped member in the vertical direction and is used to abut against the inner top of the steel rail;

[0008] A jacking assembly is arranged on the wedge-shaped member and is connected to the lifting top block for driving the lifting top block to move between a preset first position and a second position.

[0009] The second aspect of the present invention adopts the following technical solution: A clamping mechanism includes a clamping oil cylinder, two clamping pliers driven by the clamping oil cylinder, and wedge-shaped members arranged on both clamping pliers, and also includes the rail lifting mechanism as described in the first aspect of the present invention.

[0010] The third aspect of the present invention adopts the following technical solution: A welding machine head includes the clamping mechanism as described in the second aspect of the present invention.

[0011] The fourth aspect of the present invention adopts the following technical solution: A flash butt welding machine for steel rails includes the welding machine head as described in the third aspect of the present invention.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] 1. During the clamping process of the steel rail by the wedge-shaped member of this rail lifting mechanism, at the beginning, the lifting top block is placed at the preset first position, and then the jacking assembly is used to drive the lifting top block to move upward. The top of the lifting top block abuts against the inner top of the steel rail to lift the steel rail to the preset second position. The steel rail is precisely clamped by the wedge-shaped member at the preset second position, reducing the adjustment time during the alignment of the steel rail.

[0014] 2. This rail lifting mechanism is configured to be installed on the wedge-shaped member, enabling rapid automatic alignment during the clamping of the rail. It does not require additional auxiliary tools or manual touch for alignment, reducing safety issues.

[0015] 3. This rail lifting mechanism is configured to be installed on the wedge-shaped member, reducing inconvenience in operation and high labor intensity during the clamping of the rail, and improving production efficiency. Description of the Drawings

[0016] Figure 1 It is a schematic structural diagram of an embodiment of the present utility model;

[0017] Figure 2 is Figure 1 a partial enlarged view of part A in

[0018] Reference numerals in the drawings of the specification include: wedge-shaped member 1, lifting top block 2, jacking assembly 3, jacking rod 31, positioning screw 32, mounting through hole 4, oil plug 5, clamping oil cylinder 6, clamp 7, positioning step 8, rail top reference member 9, oil circuit integration block 10, clamping control valve 11, lifting control valve 12, rail 13. Detailed Description of the Embodiment

[0019] The present utility model will be further described in detail below through specific embodiments:

[0020] Since the existing flash welding machine head for railway switches requires repeated adjustment of the clamping position during the clamping of the rail 13 using two first wedge-shaped members 1 or two second wedge-shaped members 1, the clamping efficiency is relatively low. To solve this problem, as Figure 1 and Figure 2 shown, an embodiment of the present utility model provides a rail lifting mechanism, which is arranged on the corresponding wedge-shaped member 1 and includes a lifting top block 2 and a jacking assembly 3. Among them, at least a part of the lifting top block 2 is slidably arranged above the outer side of the wedge-shaped member 1 in the vertical direction and is used to abut against the inner top of the rail 13; the jacking assembly 3 is arranged on the wedge-shaped member 1 and is connected to the lifting top block 2 for driving the lifting top block 2 to move between a preset first position and a second position.

[0021] During the process of clamping the rail 13 by the wedge 1, the lifting top block 2 is initially placed at a preset first position, and then the lifting top block 2 is driven to move upward by the jacking assembly 3. The top of the lifting top block 2 abuts against the inner top of the rail 13 to lift the rail 13 to a preset second position. The rail 13 is accurately clamped by the wedge 1 at the preset second position, reducing the adjustment time during the alignment of the rail 13. This rail lifting mechanism is installed in cooperation with the wedge 1 and can quickly and automatically align during the clamping of the rail 13, without the need for additional auxiliary tools or manual touching for alignment, reducing safety issues. This rail lifting mechanism is installed in cooperation with the wedge 1, reducing inconvenience in operation and high labor intensity during the clamping of the rail 13, and improving production efficiency.

[0022] To better understand this solution, the following will further optimize the structure of the jacking assembly 3 and others.

[0023] As Figure 2 shown, according to another embodiment of the present invention, for the rail lifting mechanism, an installation through hole 4 is vertically formed inside the wedge 1, the jacking assembly 3 is arranged inside the installation through hole 4, and sealing structures are arranged at both ends of the installation through hole 4.

[0024] Here, the installation through hole 4 provides an installation channel for the jacking assembly 3 and also guides the movement of the jacking assembly 3, and the sealing structure seals the installation through hole 4.

[0025] Based on the above solution:

[0026] The jacking assembly 3 includes a jacking rod 31 and a positioning screw 32. The jacking rod 31 is arranged inside the installation through hole 4; the positioning screw 32 is connected between the jacking rod 31 and the lifting top block 2. After injecting oil into the jacking rod 31 inside the installation through hole 4, an oil cylinder is formed to provide driving force to drive the lifting top block 2 to move between the preset first position and the second position, and the positioning screw 32 stably connects the jacking rod 31 and the lifting top block 2.

[0027] Among them, the sealing structure arranged at the bottom end of the installation through hole 4 can be an oil plug 5, and the sealing structure arranged at the top end of the installation through hole 4 can be a sealing ring. One end of the jacking rod 31 connected to the positioning screw 32 freely passes through the central hole of the sealing ring, so as to form a sealed space inside the installation through hole 4, and then hydraulic oil can be injected.

[0028] In order to have a larger contact area between the lifting top block 2 and the rail 13 when the lifting top block 2 contacts the rail 13, so as to lift the rail 13 more stably; since the inner top of the rail 13 is an arc surface, the side of the lifting top block 2 for contacting the rail 13 is an arc surface; to make the lifting top block 2 and the rail 13 in sealed contact.

[0029] It should be noted that when the shape of the inner top of the rail 13 changes, the side of the lifting top block 2 that contacts the rail 13 is adapted to ensure that there is a large enough contact area when the lifting top block 2 contacts the rail 13, so that the rail 13 can be lifted more stably.

[0030] As Figure 1 and Figure 2 shown, according to another embodiment of the present invention, the clamping mechanism includes a clamping oil cylinder 6, two clamping jaws 7 driven by the clamping oil cylinder 6, and wedge-shaped members 1 provided on both clamping jaws 7, and further includes the rail lifting mechanism described in any of the above embodiments.

[0031] When clamping the rail 13, the clamping oil cylinder 6 drives the two clamping jaws 7 to move towards each other, and the two wedge-shaped members 1 move towards each other to initially position and clamp the rail 13. In this state, the rail 13 can still move upward between the two wedge-shaped members 1; then the rear lifting rod 31 operates to drive the lifting top block 2 to move upward to contact the lower jaw of the rail 13 (the inner top of the rail 13). When the lifting rod 31 continues to operate and lifts the rail 13 to a preset second position, the rail lifting is completed. The clamping oil cylinder 6 is started again to make the two clamping jaws 7 move towards each other, and the two wedge-shaped members 1 move towards each other to precisely clamp the rail 13, and the lifting rod 31 runs in the reverse direction to drive the lifting top block 2 to move downward back to the preset first position to complete the clamping of the rail 13.

[0032] Wherein, a positioning step 8 is formed on the top side of each wedge-shaped member 1, and the bottom side of the lifting top block 2 abuts against the positioning step 8. When the lifting top block 2 is in the preset first position, the bottom side of the lifting top block 2 abuts against the positioning step 8 for stable arrangement; in this embodiment, the positioning step 8 is in an "L" shape to ensure that there is a large enough contact surface between the lifting top block 2 and the positioning step 8 and improve the positioning stability of the lifting top block 2.

[0033] Based on the above scheme:

[0034] A rail top reference member 9 is fixedly arranged above the position between the two cooperating wedge-shaped members 1, and the rail top reference member 9 is used to abut against the rail 13 for positioning during rail lifting.

[0035] When the rail 13 is lifted upward to abut against the rail top reference member 9, the lifting top block 2 reaches the preset second position for precise positioning of this position. At this time, the two wedge-shaped members 1 move towards each other to precisely clamp the rail 13.

[0036] Furthermore, the clamping mechanism further includes an oil circuit integration block 10, and a clamping control valve 11 cooperating with the clamping oil cylinder 6 and a lifting control valve 12 cooperating with the lifting assembly 3 are arranged on the oil circuit integration block 10.

[0037] The specific operations during clamping are as follows:

[0038] When lifting the rail, the oil circuit integrated block 10 is in the low-pressure oil supply state, the clamping control valve 11 acts, the hydraulic oil flows into the clamping cylinder 6, the piston rod of the clamping cylinder 6 moves upward, driving the upper ear seat of the clamp 7 to rotate outward around the central axis, the lower sides of the two clamps 7 move towards each other, driving the two wedge-shaped parts 1 to move towards each other, and the rail 13 completes the initial positioning and clamping;

[0039] Then the rear lifting control valve 12 acts, the hydraulic oil flows through the oil circuit integrated block 10 into the installation through hole 4, the jacking rod 31 runs, drives the lifting top block 2 to move upward through the positioning screw 32 until the rail 13 contacts the rail top reference part 9, and the rail lifting is completed;

[0040] The oil circuit integrated block 10 is switched to the high-pressure oil supply state, the piston rod in the clamping cylinder 6 continues to move upward under high pressure, the lower sides of the two clamps 7 continue to move towards each other, driving the two wedge-shaped parts 1 to continue to move towards each other until the rail 13 is clamped;

[0041] The rear lifting control valve 12 acts, the hydraulic oil flows through the oil circuit integrated block 10 into the installation through hole 4 to drive the jacking rod 31 to move downward, and drives the lifting top block 2 to move downward until it abuts against the positioning step 8, and the clamping is completed.

[0042] In this embodiment, for other structures in the clamping mechanism, reference can be made to the corresponding structures in CN117961244A.

[0043] As Figure 1 shown, according to another embodiment of the present invention, the welding machine head includes the clamping mechanism described in any of the above embodiments and has the advantages of the clamping mechanism; in this embodiment, for other structures in the welding machine head, reference can be made to the corresponding structures in CN117961244A.

[0044] According to another embodiment of the present invention, the rail flash welding machine includes the welding machine head described in any of the above embodiments and has the advantages of the welding machine head; in this embodiment, for other structures in the rail flash welding machine, reference can be made to the corresponding structures in CN117961244A.

[0045] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the purpose and scope of the technical solutions of the present invention, and they should all be covered within the scope of the claims of the present invention.

Claims

1. A rail lifting mechanism, which is arranged on a corresponding wedge-shaped member, characterized in that: include: A lifting top block, wherein at least a portion of the lifting top block is slidably disposed on the outside and above the wedge-shaped member in a vertical direction and is used to abut against the inner top of the rail; The jacking assembly is arranged on the wedge-shaped member and connected to the lifting top block, and is used for driving the lifting top block to move between a preset first position and a second position.

2. The rail lifting mechanism according to claim 1, characterized in that: A mounting through hole is opened in the wedge-shaped piece along the vertical direction, the jacking assembly is arranged in the mounting through hole, and sealing structures are arranged at both ends of the mounting through hole.

3. The rail lifting mechanism according to claim 2, characterized in that: The lifting assembly comprises: A lifting rod, wherein the lifting rod is arranged in the mounting through hole; A positioning screw is connected between the lifting rod and the lifting top block.

4. The rail lifting mechanism according to any one of claims 1 to 3, characterized in that: The side surface of the lifting top block for contacting with the rail is an arc surface.

5. A clamping mechanism, comprising a clamping cylinder, two clamps driven by the clamping cylinder, and wedges disposed on both clamps, characterized in that: It also includes a rail lifting mechanism as described in any one of claims 1-4.

6. The clamping mechanism according to claim 5, characterized in that: A positioning step is formed on the top side of each wedge-shaped piece, and the bottom side of the lifting top block abuts against the positioning step.

7. The clamping mechanism according to claim 5, characterized in that: A rail top reference piece is fixedly arranged above the two wedge-shaped pieces, and the rail top reference piece is used for positioning against the steel rail during rail lifting.

8. The clamping mechanism according to claim 5, characterized in that: It also includes an oil circuit integrated block, on which a clamping control valve matched with the clamping oil cylinder and a lifting control valve matched with the jacking assembly are arranged.

9. A welding machine head, characterized in that: Comprising a clamping mechanism as described in any one of claims 5-8.

10. A rail flash welding machine, characterized in that: Comprising the welding machine head as claimed in claim 9.

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