Rail clamping device of crane

Abstract

The invention provides a crane rail clamping device. The crane rail clamping device comprises a fixing frame, a protection plate, a rail clamping assembly and a guide assembly. According to the rail clamping device, the guide assembly and the rail clamping assembly share the connecting base as the driving end, when the connecting base moves upwards to loosen a rail, a fixing rod drives a first transmission rod set to drive a shear fork arm set to swing around a pin shaft fixed to a protection plate, two rolling wheels abut against the two sides of the rail, and therefore the rail clamping device is switched to be in a guide state; when the crane moves along the bent track, the track extrudes the roller to force the shear fork arm group to swing, the swing is fed back to the connecting seat through the first transmission rod group and the fixed rod, and then the fixed frame is driven to rotate around the guide rod relative to the protective plate, so that the clamping surface of the jaw is always self-adaptively perpendicular to the tangential direction of the track; and it is ensured that clamping force always perpendicularly acts on the surface of the rail, clamping force loss and local abrasion caused by deflection angles are avoided, and the fixing performance and reliability of the rail clamping device on the bent rail are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to a crane rail clamp, belonging to the technical field of crane safety devices. BACKGROUND

[0002] Crane working in open air may slide along the track under the influence of strong wind and cause collision accidents, therefore, rail clamp is usually installed to ensure the safety of the crane. In high-precision hoisting operation, rail clamp can reduce the sway of the crane during operation and help the crane to accurately position.

[0003] The existing rail clamp usually includes a fixed frame, a rail clamping arm and a driving mechanism. The rail clamping arm is driven to swing by the driving mechanism, so that the jaws clamp the two side surfaces of the track, thereby realizing the fixation of the crane. Ideally, the clamping force of the rail clamp is perpendicular to the surface of the track to achieve the best fixation effect. At this time, the jaws are in uniform contact with the track, and the clamping is stable and reliable.

[0004] However, in actual application, the track of the crane is often not completely flat. Influenced by factors such as foundation settlement, installation error, deformation due to long-term use, etc., the track will produce certain bending or twisting. When the rail clamp is installed in the curved track section, the jaws of the traditional rail clamp are difficult to automatically adjust the posture to adapt to the change of the track direction, resulting in an included angle between the clamping surface of the jaws and the side surface of the track. When there is an angle, part of the clamping force will be decomposed into a component parallel to the track direction, which will reduce the effective clamping force of the rail clamp in the vertical direction of the track, thereby affecting its fixation performance, and in severe cases, it may cause the rail clamp to fail under the action of strong wind. In addition, the angle will also cause the edge part of the jaws of the rail clamp and the track to wear more intensively, the local stress is concentrated, the service life of them is shortened, and the maintenance cost is increased. Therefore, a crane rail clamp is proposed. SUMMARY

[0005] Therefore, the present application provides a crane rail clamp to solve or alleviate the technical problems in the prior art, at least to provide a beneficial choice.

[0006] The technical scheme of the present application is as follows: a crane rail clamp, comprising a fixed frame, a guard plate, a rail clamping assembly and a guide assembly; The guard plate is sleeved outside the fixed frame, a guide rod is rotatably connected to the fixed frame, and both ends of the guide rod are fixedly connected to the guard plate, The rail clamping assembly is arranged on the fixed frame and comprises a connecting seat moving linearly and reciprocally, and the rail clamping assembly clamps or releases the track under the drive of the connecting seat; The guide assembly comprises a fixed rod fixedly connected to the connecting seat, a first transmission rod group fixedly connected to the fixed rod, a scissor arm group composed of a first connecting arm and a second connecting arm intersecting each other, and two rollers, the middle parts of the first connecting arm and the second connecting arm being rotatably connected through a pin shaft fixedly connected to a guard plate, and the two rollers being respectively arranged at opposite ends of the first connecting arm and the second connecting arm. When the connecting seat moves, the scissor arm group is driven to swing around the pin shaft through the fixed rod and the first transmission rod group, so that the two rollers abut against both sides of the track when the track clamping assembly loosens the track, or are away from the track when the track clamping assembly clamps the track.

[0007] Further preferably, the track clamping assembly comprises a motor, a speed reducer, a lead screw, two track clamping arms, and two jaws; the motor is fixedly installed on the fixed frame through a support, the speed reducer is installed at the output end of the motor, the input end of the lead screw is connected with the speed reducer, the connecting seat is threadedly connected with the lead screw, the two track clamping arms are rotatably connected to the fixed frame through shafts respectively, and the two jaws are fixedly connected to opposite sides of the two track clamping arms respectively; the connecting seat is hingedly connected to one end of the two track clamping arms through two connecting rods.

[0008] Further preferably, a bearing seat is arranged on the fixed frame at a position corresponding to the lead screw.

[0009] Further preferably, the first transmission rod group comprises a first rod body and a second rod body; one end of the first rod body is rotatably connected to the fixed rod, and the other end is rotatably connected to one end of the second connecting arm; one end of the second rod body is rotatably connected to the fixed rod, and the other end is rotatably connected to one end of the first connecting arm.

[0010] Further preferably, the guard plate is connected to the trolley or the car of the crane through a mounting plate assembly, the mounting plate assembly comprises a first mounting plate, a second mounting plate, and a connecting plate; the first mounting plate is fixedly connected to one side of the guard plate, one end of the second mounting plate is hingedly connected to the first mounting plate, the other end of the second mounting plate is hingedly connected to the connecting plate, and the connecting plate is fixedly installed on the trolley or the car of the crane.

[0011] Further preferably, the guard plate is arranged in a U-shaped plate structure, and the fixed frame is wrapped in the U-shaped plate structure.

[0012] Further preferably, a driving wheel is mounted on one side of the guard plate, and the driving wheel is arranged to roll on the track.

[0013] Further preferably, the guide rods are arranged in multiple and symmetrically on the fixed frame, and both ends of each guide rod are fixedly connected to the guard plate.

[0014] The embodiment of the present application has the following advantages due to the above technical solutions. Firstly, the present application sets the guide assembly and the shared connecting seat as the driving end with the rail clamping assembly. When the connecting seat moves upward to loosen the rail, the fixed rod drives the first transmission rod group to drive the scissor arm group to swing around the pin shaft fixed on the guard plate, so that the two rollers are abutted on both sides of the rail, thereby switching the rail clamp to the guide state. When the crane moves along the curved rail, the rail presses the rollers to force the scissor arm group to swing, which is fed back to the connecting seat through the first transmission rod group and the fixed rod, thereby driving the fixed frame to rotate around the guide rod relative to the guard plate, so that the clamping surface of the jaw is always self-adaptively perpendicular to the tangent direction of the rail, ensuring that the clamping force is always perpendicular to the surface of the rail, avoiding the loss of clamping force and local wear caused by the deflection angle, and improving the fixing performance and reliability of the rail clamp on the curved rail.

[0015] Secondly, the present application sets the mounting plate assembly composed of the first mounting plate, the second mounting plate and the connecting plate, and connects the guard plate with the trolley or the car of the crane. The second mounting plate is hingedly connected with the first mounting plate and the connecting plate at both ends, forming a non-rigid connection structure, allowing the guard plate to have a certain deflection freedom in the horizontal plane, which can buffer the impact load generated when the crane starts and stops, and reduce the impact on the components of the rail clamp.

[0016] The above summary is only for the purpose of the description and is not intended to limit in any way. In addition to the above described exemplary aspects, embodiments and features, further aspects, embodiments and features of the present application will be readily apparent to those skilled in the art by reference to the drawings and the following detailed description. BRIEF DESCRIPTION OF DRAWINGS In order to more clearly illustrate the technical solutions of the embodiments or the prior art in the present application, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creating any creative labor.

[0017] Figure 1 The structural diagram of the present application.

[0018] Figure 2 The side view of the fixed frame and the guide rod in the present application.

[0019] Figure 3 The front view of the first connecting arm and the second connecting arm in the present application.

[0020] Figure 4 The structural diagram of the connecting plate and the first mounting plate in the present application.

[0021] Figure 5 This is a structural diagram of the clamping arm and connecting rod in this invention.

[0022] in: 1-Fixed frame; 10-Support; 11-Bearing seat; 12-Motor; 13-Reducer; 14-Screw; 15-Connecting seat; 16-Connecting rod; 17-Rail clamping arm; 18-Jaw; 19-Rotating shaft; 20-Fixed rod; 21-First rod body; 22-Second rod body; 23-First connecting arm; 24-Second connecting arm; 25-Pin shaft; 26-Roller; 27-Guide rod; 30-First mounting plate; 31-Second mounting plate; 32-Connecting plate; 4-Guard plate; 5-Rail; 6-Drive wheel. Detailed Implementation To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. However, it should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of the invention. Furthermore, descriptions of well-known structures and technologies are omitted in the following description to avoid unnecessarily obscuring the concept of the invention.

[0023] In the description of this invention, it should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to or indirectly connected to the other element.

[0024] In the description of this invention, it should be noted that the terms "center," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this invention is in use. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified. "Several" means one or more, unless otherwise explicitly specified.

[0025] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0026] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0027] like Figures 1-5 As shown, an embodiment of the present invention provides a crane rail clamp, including a fixing frame 1, a guard plate 4, a rail clamping assembly, and a guide assembly; In one embodiment, the protective plate 4 is sleeved on the outside of the fixed frame 1, and a guide rod 27 is rotatably connected to the fixed frame 1. The two ends of the guide rod 27 are fixedly connected to the protective plate 4. Multiple guide rods 27 are provided and symmetrically arranged on the fixed frame 1. The two ends of each guide rod 27 are fixedly connected to the protective plate 4, so that the fixed frame 1 can rotate relative to the protective plate 4 about the axis of the guide rod 27 to achieve position adjustment.

[0028] In one embodiment, the rail clamping assembly is disposed on the fixed frame 1 and includes a connecting seat 15 that moves linearly reciprocatingly. The rail clamping assembly clamps or releases the rail 5 under the drive of the connecting seat 15. Specifically, the rail clamping assembly includes a motor 12, a reducer 13, a lead screw 14, two rail clamping arms 17, and two jaws 18. The motor 12 is fixedly mounted on the fixed frame 1 via a support 10. The reducer 13 is mounted on the output end of the motor 12. The input end of the lead screw 14 is connected to the reducer 13. A bearing seat 11 is provided on the fixed frame 1 corresponding to the position of the lead screw 14. The lead screw 14 is supported on the bearing seat 11 by the bearing. A connecting seat 15 is threadedly connected to the lead screw 14. When the motor 12 drives the lead screw 14 to rotate, the connecting seat 15 moves linearly back and forth along the lead screw 14.

[0029] Two rail clamping arms 17 are rotatably connected to the fixed frame 1 via a rotating shaft 19, and two jaws 18 are fixedly connected to the opposite side of the two rail clamping arms 17. The connecting seat 15 is hinged to one end of the two rail clamping arms 17 via two connecting rods 16. When the connecting seat 15 moves, the connecting rods 16 push or pull the rail clamping arms 17 to swing around the rotating shaft 19, thereby realizing the action of clamping or releasing the rail 5 by the jaws 18.

[0030] In one embodiment, the guide assembly includes a fixed rod 20 fixedly connected to the connecting seat 15, a first transmission rod group fixedly connected to the fixed rod 20, a scissor arm group formed by the intersection of a first connecting arm 23 and a second connecting arm 24, and two rollers 26. The middle parts of the first connecting arm 23 and the second connecting arm 24 are rotatably connected by a pin 25, which is fixedly connected to the guard plate 4. The two rollers 26 are respectively disposed at opposite ends of the first connecting arm 23 and the second connecting arm 24. The first transmission rod group includes a first rod body 21 and a second rod body 22. One end of the first rod body 21 is rotatably connected to the fixed rod 20, and the other end is rotatably connected to one end of the second connecting arm 24. One end of the second rod body 22 is rotatably connected to the fixed rod 20, and the other end is rotatably connected to one end of the first connecting arm 23. This allows the connecting seat 15 to simultaneously drive the first rod body 21 and the second rod body 22 through the fixed rod 20 when it moves, thereby causing the scissor arm group to swing. When the connecting seat 15 moves, the scissor arm assembly is driven to swing around the pin shaft 25 through the fixed rod 20 and the first transmission rod assembly, so that the two rollers 26 abut against the sides of the rail 5 when the rail clamping assembly releases the rail 5, or move away from the rail 5 when the rail clamping assembly clamps the rail 5.

[0031] Specifically, when the rail clamping assembly needs to release the rail 5, the motor 12 drives the lead screw 14 to rotate, causing the connecting seat 15 to move upward. Since the fixed rod 20 is fixedly connected to the connecting seat 15, the fixed rod 20 moves upward together with the connecting seat 15. When the fixed rod 20 moves upward, it drives the first rod body 21 and the second rod body 22, which are rotatably connected to it, to move upward. The other end of the first rod body 21 is rotatably connected to the second connecting arm 24, and the other end of the second rod body 22 is rotatably connected to the first connecting arm 23. Therefore, while the first rod body 21 and the second rod body 22 move upward, they will pull the first connecting arm 23 and the second connecting arm 24. Since the middle parts of the first connecting arm 23 and the second connecting arm 24 are rotatably connected by the pin 25 fixed on the guard plate 4, forming a scissor structure, when the first rod body 21 and the second rod body 22 are pulled upward, the first connecting arm 23 and the second connecting arm 24 swing around the pin 25, causing the two free ends to move closer to each other. Two rollers 26 are respectively located at opposite ends of the first connecting arm 23 and the second connecting arm 24, so the two rollers 26 are close to each other and abut against both sides of the track 5.

[0032] When the rail clamping assembly needs to clamp the rail 5, the connecting seat 15 moves downward, and the fixing rod 20 moves downward accordingly, pushing the first rod 21 and the second rod 22 to move downward, which in turn pushes the first connecting arm 23 and the second connecting arm 24 to swing in opposite directions, causing the two rollers 26 to move away from each other and disengage from the rail 5.

[0033] When the two rollers 26 abut against both sides of the track 5 and the crane moves along the track 5, the rollers 26 serve to guide and sense the direction of the track 5. Specifically, when the track 5 is curved, the rollers 26 are squeezed by the sidewalls of the track 5, forcing the first connecting arm 23 and the second connecting arm 24 to swing around the pin 25. This swing is transmitted to the fixed rod 20 through the first rod 21 and the second rod 22, and then to the connecting seat 15. Since the connecting seat 15 is connected to the fixed frame 1 through the rail clamping assembly, and the fixed frame 1 is rotatably connected to the guard plate 4 through the guide rod 27, when the fixed rod 20 is subjected to the pushing and pulling force from the first rod 21 and the second rod 22, it will drive the entire fixed frame 1 to rotate relative to the guard plate 4 around the guide rod 27. This rotation causes the rail clamping arm 17 and the jaw 18 on the fixed frame 1 to rotate accordingly, so that the clamping surface of the jaw 18 is always adaptively perpendicular to the tangential direction of the track 5.

[0034] In one embodiment, the guard plate 4 is connected to the crane's trolley or carriage via a mounting plate assembly. The mounting plate assembly includes a first mounting plate 30, a second mounting plate 31, and a connecting plate 32. The first mounting plate 30 is fixedly connected to one side of the guard plate 4. One end of the second mounting plate 31 is hinged to the first mounting plate 30, and the other end of the second mounting plate 31 is hinged to the connecting plate 32. The connecting plate 32 is fixedly mounted on the crane's trolley or carriage. This non-rigid connection between the guard plate 4 and the crane allows the guard plate 4 to have a certain degree of deflection freedom in the horizontal plane, enabling adaptive rotation so that the jaws 18 can follow the direction changes of the rail 5. The guard plate 4 is configured as a U-shaped plate structure, enclosing the fixing frame 1 within it. This protects the internal components and provides sufficient space for the rotation of the fixing frame 1. A drive wheel 6 is mounted on one side of the guard plate 4. The drive wheel 6 is rolled on the rail 5 to guide the guard plate 4 to move smoothly along the rail 5 when the rail clamping assembly is released. The clamping surface of the jaw 18 is designed to match the side of the track 5, so that surface contact can be formed when clamping, thereby improving clamping stability.

[0035] In operation, when the crane needs to be fixed on the track 5, the motor 12 starts rotating forward, and the torque is increased by the reducer 13 to drive the lead screw 14 to rotate. Since the connecting seat 15 is threadedly connected to the lead screw 14, and the bearing seat 11 on the fixing frame 1 provides support for the lead screw 14, the rotational motion of the lead screw 14 is converted into the linear downward movement of the connecting seat 15.

[0036] When the connecting seat 15 moves downward, it pushes one end of the two clamping arms 17 to swing outward through the two connecting rods 16. Since the middle parts of the two clamping arms 17 are rotatably connected to the fixed frame 1 through the rotating shaft 19, one end of the jaws 18 of the clamping arms 17 swings inward. The two jaws 18 are fixedly connected to the opposite sides of the two clamping arms 17, so the two jaws 18 move closer to each other and clamp the two sides of the rail 5.

[0037] Simultaneously, the connecting seat 15 moves downward, causing the fixed rod 20 fixedly connected to it to move downward as well. When the fixed rod 20 moves downward, it pushes the first connecting arm 23 and the second connecting arm 24 through the first rod body 21 and the second rod body 22 rotatably connected to it. Since the middle parts of the first connecting arm 23 and the second connecting arm 24 are rotatably connected to the guard plate 4 through the pin 25 fixedly connected to form a scissor structure, when the first rod body 21 and the second rod body 22 push downward, the first connecting arm 23 and the second connecting arm 24 swing in opposite directions around the pin 25, causing the two free ends to move away from each other. Therefore, the two rollers 26 move away from each other and disengage from both sides of the track 5.

[0038] At this point, the rail clamping assembly has completed the clamping action, with jaw 18 clamping rail 5 and roller 26 in the retracted state, ensuring the crane is securely fixed.

[0039] When the crane needs to be moved, the motor 12 starts and reverses, driving the lead screw 14 to rotate in the opposite direction, causing the connecting seat 15 to move upward.

[0040] When the connecting seat 15 moves upward, the two connecting rods 16 pull one end of the two rail clamping arms 17 to swing inward, causing the other end of the two rail clamping arms 17 to swing outward, and the two jaws 18 to move away from each other, thus releasing the rail 5.

[0041] At the same time, the connecting seat 15 moves upward, causing the fixed rod 20 to move upward as well. When the fixed rod 20 moves upward, it pulls the first connecting arm 23 and the second connecting arm 24 through the first rod body 21 and the second rod body 22 that are rotatably connected to it. Due to the action of the scissor mechanism, the first connecting arm 23 and the second connecting arm 24 swing forward around the pin 25, and the two rollers 26 move closer to each other and abut against both sides of the track 5.

[0042] At this point, the rail clamping assembly has completed its release action, the jaws 18 disengage from the rail 5, and the rollers 26 press against both sides of the rail 5, switching the rail clamp from the clamping state to the guiding state. At this time, the drive wheel 6 mounted on one side of the guard plate 4 rolls on the rail 5, guiding the guard plate 4 to move along the rail 5.

[0043] As the crane moves along the track 5, the rollers 26 roll close to both sides of the track 5, sensing changes in the track 5's direction in real time. The sidewalls of the track 5 press against the rollers 26, forcing the first connecting arm 23 and the second connecting arm 24 to swing around the pin 25. This swing is transmitted to the fixed rod 20 through the first rod 21 and the second rod 22, and then to the connecting seat 15.

[0044] Since the connecting seat 15 is connected to the fixed frame 1 via the rail clamping assembly, and the fixed frame 1 is rotatably connected to the guide rod 27, with both ends of the guide rod 27 fixedly connected to the guard plate 4, the fixed frame 1 can rotate relative to the guard plate 4 around the guide rod 27. When the fixed rod 20 is subjected to pushing or pulling forces from the first rod body 21 and the second rod body 22, it will drive the entire fixed frame 1 to rotate relative to the guard plate 4 around the guide rod 27. This rotation causes the rail clamping arm 17 and the jaws 18 on the fixed frame 1 to rotate accordingly, so that the clamping surface of the jaws 18 is always adaptively perpendicular to the tangential direction of the rail 5.

[0045] Furthermore, the guard plate 4 is connected to the crane's trolley or carriage via a mounting plate assembly. The mounting plate assembly includes a first mounting plate 30, a second mounting plate 31, and a connecting plate 32, wherein the two ends of the second mounting plate 31 are hinged to the first mounting plate 30 and the connecting plate 32 respectively, forming a non-rigid connection structure. As the rail clamping assembly clamps, since the guard plate 4 is connected to the crane's trolley or carriage through the second mounting plate 31 and the hinge structure, the position of the guard plate 4 can adaptively deflect following the rail 5. Because the actual deflection angle of the rail 5 is very small and always within the opening range of the clamping assembly's jaws 18, no human intervention is required. The rail clamping assembly of the present invention can automatically adapt to the deflection angle of the rail 5 during rail clamping operations.

[0046] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various variations or substitutions within the technical scope disclosed in the present invention, and these should all be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A crane rail clamp, characterized in that: Includes a fixing frame (1), a guard plate (4), a rail clamping assembly, and a guide assembly; The protective plate (4) is sleeved on the outside of the fixing frame (1). A guide rod (27) is rotatably connected to the fixing frame (1). Both ends of the guide rod (27) are fixedly connected to the protective plate (4). The rail clamping assembly is disposed on the fixed frame (1) and includes a connecting seat (15) that moves linearly back and forth. The rail clamping assembly clamps or releases the rail (5) under the drive of the connecting seat (15). The guide assembly includes a fixed rod (20) fixedly connected to the connecting seat (15), a first transmission rod group fixedly connected to the fixed rod (20), a scissor arm group formed by the intersection of the first connecting arm (23) and the second connecting arm (24), and two rollers (26). The middle parts of the first connecting arm (23) and the second connecting arm (24) are rotatably connected by a pin (25). The pin (25) is fixedly connected to the guard plate (4). The two rollers (26) are respectively disposed at opposite ends of the first connecting arm (23) and the second connecting arm (24). When the connecting seat (15) moves, the scissor arm assembly is driven to swing around the pin shaft (25) by the fixed rod (20) and the first transmission rod assembly, so that the two rollers (26) abut against the sides of the rail (5) when the rail clamping assembly releases the rail (5), or move away from the rail (5) when the rail clamping assembly clamps the rail (5).

2. A crane rail clamp according to claim 1, characterized in that: The rail clamping assembly includes a motor (12), a reducer (13), a lead screw (14), two rail clamping arms (17), and two jaws (18). The motor (12) is fixedly mounted on the fixed frame (1) via a support (10). The reducer (13) is mounted on the output end of the motor (12). The input end of the lead screw (14) is connected to the reducer (13). The connecting seat (15) is threadedly connected to the lead screw (14). The two rail clamping arms (17) are rotatably connected to the fixed frame (1) via a rotating shaft (19). The two jaws (18) are fixedly connected to the opposite side of the two rail clamping arms (17). The connecting seat (15) is hinged to one end of the two rail clamping arms (17) via two connecting rods (16).

3. A crane rail clamp according to claim 2, characterized in that: A bearing seat (11) is provided on the fixed frame (1) at the position corresponding to the lead screw (14).

4. A crane rail clamp according to claim 1, characterized in that: The first transmission rod assembly includes a first rod body (21) and a second rod body (22); one end of the first rod body (21) is rotatably connected to the fixed rod (20), and the other end is rotatably connected to one end of the second connecting arm (24); one end of the second rod body (22) is rotatably connected to the fixed rod (20), and the other end is rotatably connected to one end of the first connecting arm (23).

5. A crane rail clamp according to claim 1, characterized in that: The guard plate (4) is connected to the crane's trolley or carriage via a mounting plate assembly. The mounting plate assembly includes a first mounting plate (30), a second mounting plate (31), and a connecting plate (32). The first mounting plate (30) is fixedly connected to one side of the guard plate (4). One end of the second mounting plate (31) is hinged to the first mounting plate (30), and the other end of the second mounting plate (31) is hinged to the connecting plate (32). The connecting plate (32) is fixedly mounted on the crane's trolley or carriage.

6. A crane rail clamp according to claim 5, characterized in that: The guard plate (4) is configured as a U-shaped plate structure, which encloses the fixing frame (1).

7. A crane rail clamp according to claim 6, characterized in that: A drive wheel (6) is installed on one side of the guard plate (4), and the drive wheel (6) is rolled on the track (5).

8. A crane rail clamp according to claim 1, characterized in that: The guide rods (27) are configured as a plurality of ones, symmetrically arranged on the fixed frame (1), and both ends of each guide rod (27) are fixedly connected to the guard plate (4).

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