A track large rail component laying and replacing operation system

Abstract

The present application discloses a large rail component replacement operation system, comprising: a marshaled rail car, a first transport flat car, and a second transport flat car; no less than two gantry cranes that are folded and placed horizontally on the first transport flat car in a transport state; a retractable device that is provided on the first transport flat car or the second transport flat car and can place or retract the gantry cranes through a flip-type structure; in the placement operation state, the gantry cranes are transported to a designated position via a longitudinal guide rail provided on the first transport flat car, and are clamped and flipped by the retractable device. After the gantry cranes are extended to a normal state, they are placed on the track. The present application can solve the technical problems of existing large rail component replacement equipment for rails, such as complex structure and operation, high cost, and limited space utilization.

Description

Technical Field

[0001] The present application relates to the technical field of railway engineering machinery, and in particular to a large rail component laying and replacing operation system for high-speed railway tracks. Background Art

[0002] High-speed rail lines primarily operate at speeds exceeding 250 km / h. Due to the rapid passage of vehicles and the impact and rolling of their wheels, rail tracks can easily become worn over long distances, necessitating replacement. The high frequency of vehicle traffic requires rapid repair of worn rails. To save time, large track components, such as rail switches and point rails, must be replaced simultaneously. High-speed rail components primarily refer to rails approximately 50 meters long, size 18 and above large track components (such as rail switches, connecting rails, point rails, and stock rails), and key components such as track plates. These components are characterized by their long length and heavy weight, making manual replacement difficult. However, due to the limited operating area for high-speed rail components, existing equipment such as rail-changing vehicles and 25-ton rail cranes are unable to meet these requirements. Therefore, achieving rapid replacement of high-speed rail components is a pressing technical challenge.

[0003] At present, there are mainly the following methods for replacing large rail parts of high-speed railway tracks:

[0004] The first method is to use 2 to 3 25T crane rail vehicles to lift large rail components from the adjacent line. This method can easily cause large rail components to be damaged due to deformation during the operation. In addition, due to the poor synchronization of the operations of multiple crane rail vehicles, there is a technical problem that large swings are prone to occur, posing a safety hazard.

[0005] The second method involves using large-scale track maintenance equipment (rail-changing vehicles) for long-distance rail replacement. However, due to the characteristics of the equipment, this method is only suitable for long-distance rail replacements, typically on the order of kilometers, and the preparation work is lengthy. Furthermore, when using this equipment to replace rails over tens or hundreds of meters, the end guide rails will wear out faster than the required length. Therefore, this method's main drawbacks are high cost, low efficiency, and unsuitability for rail replacements of approximately 50 meters.

[0006] In the prior art, the following technical solutions are mainly related to this application:

[0007] Prior art 1 is a Chinese invention application filed by the present applicant on March 31, 2022, and published on July 29, 2022, with publication number CN114808567A, entitled "A gantry crane device for replacing railway line components and its operating method". The application discloses a gantry crane device for replacing railway line components and its operating method, the device comprising: a truss; a transverse running mechanism arranged on the truss and capable of moving laterally along the truss to adjust the lifting position; the transverse running mechanism comprises a lifting mechanism, which can drive the chain to move up and down vertically to realize the transportation of railway line components; a left support leg and a right support leg respectively movably arranged at the lower part of the left and right ends of the truss, the left support leg and the right support leg can move laterally along the truss to adjust the lateral span of the gantry crane device. The left support leg and the right support leg can move up and down vertically to adjust the height of the truss from the working surface. This application can solve the technical problems that the existing railway line component replacement method occupies adjacent line space, poses operational safety risks, is inflexible in operation, and is difficult to adapt to operational requirements under complex working conditions of railway lines.

[0008] Prior art 2 is the Chinese invention application "A Turnout Replacement Device and System" filed by the present applicant on May 7, 2022 and published on July 5, 2022, with publication number CN114701954A. The application discloses a turnout replacement device and system, which includes a gantry crane, which further includes: a crossbeam; sliding frames movably arranged at the left and right ends of the crossbeam, the sliding frames being able to move laterally along the crossbeam to adjust the lateral span of the gantry crane; a lifting mechanism arranged on the crossbeam and located between the two sliding frames, which can move laterally along the crossbeam to adjust the lifting position of the turnout; and legs respectively arranged below the two sliding frames, which can be retracted vertically to adjust the height of the crossbeam from the roadbed. In operation, several gantry cranes are arranged at intervals along the direction of the railway line and straddle the roadbed on both sides of the rails. The application can solve the technical problems of low operational safety of existing turnout replacement equipment and its inability to lift large-sized turnout components.

[0009] However, both the above-mentioned prior arts 1 and 2 have the following technical defects:

[0010] 1) The door crane retractable mechanism has a complex structure. The retractable operation includes lifting, rotating, clamping and other steps, which is inconvenient and time-consuming.

[0011] 2) The gantry crane structure is relatively complex. It needs to be rotated to be placed on the flat car without exceeding the limit for transportation. The gantry crane legs include a two-stage lifting structure, which greatly increases the cost.

[0012] 3) The gantry crane needs to be rotated and placed longitudinally, and due to its long length, it can only accommodate about 4 gantry cranes per vehicle, which limits the gantry crane transportation capacity of a single flat car. Summary of the Invention

[0013] In view of this, the purpose of this application is to provide a track large rail component replacement operation system to solve the technical problems of existing track large rail component replacement equipment with complex structure and operation, high cost and limited space utilization.

[0014] In order to achieve the above-mentioned invention objectives, the present application specifically provides a technical implementation scheme of a track large rail member laying and replacing operation system, the track large rail member laying and replacing operation system comprising:

[0015] The marshaled railcar, the first transport flatcar and the second transport flatcar;

[0016] At least two door hanging devices are placed transversely on the first transport flat car in a folded manner in the transport state;

[0017] A retractable device is provided on the first transport flat car or the second transport flat car and can realize the placement or recovery of the door hanging device through a flip structure;

[0018] In the placement operation state, the door hanging device is transported to the designated position through the longitudinal guide rail arranged on the first transport flat car, and is clamped and flipped by the retracting device. The door hanging device is placed on the line after being extended to the normal state.

[0019] Furthermore, the door hanging device includes:

[0020] The crossbeam further comprises a main beam and folding arms hinged to the left and right sides of the main beam respectively;

[0021] Transverse sliding frames are movably arranged at the left and right ends of the beam, and the transverse sliding frames can move laterally along the beam to adjust the transverse span of the door hanging device;

[0022] A lifting mechanism is provided on the crossbeam and located between the two transverse sliding frames, and can move laterally along the crossbeam to adjust the transverse lifting position of the track large rail member;

[0023] A lifting chain connected to the lifting mechanism for lifting large track components;

[0024] The supporting legs are respectively arranged under the two transverse sliding frames and can be extended and retracted in the vertical direction to adjust the height of the beam from the horizontal plane of the line and realize the leveling of the door hanging device at the same time.

[0025] Furthermore, the transverse sliding frame is mounted on the exterior of the crossbeam, and a folding drive mechanism is hingedly connected between the main beam and the folding arm. When the retractable device is placing the door hanger, the folding drive mechanism can drive the folding arm to unfold relative to the main beam, and the transverse sliding frame can move toward the outside of the crossbeam to increase the lateral span of the door hanger. When the retractable device is retracting the door hanger, the folding drive mechanism can drive the folding arm to retract relative to the main beam, and the transverse sliding frame can move toward the inside of the crossbeam to reduce the overall width of the door hanger.

[0026] Furthermore, the retracting and extending device includes:

[0027] A base fixed to the body of the first transport flat car or the second transport flat car;

[0028] a flip frame with one end hinged to the base and the other end extending upward;

[0029] A turning drive mechanism hinged between the base and the turning frame;

[0030] A clamping mechanism hinged to the top of the turning frame for clamping the large rail member;

[0031] and a connecting rod hinged between the clamping mechanism and the base;

[0032] The turning frame, the base, the turning frame clamping mechanism and the connecting rod form a four-bar linkage mechanism. The turning frame can be turned over in the front-back direction relative to the base under the drive of the turning drive mechanism.

[0033] Furthermore, the legs include a main leg disposed below the two transverse sliding frames, a bracket fixed below the main leg, and leveling legs disposed on the left and right sides of the bracket. The leveling legs further include sleeves fixed to the left and right sides of the bracket, and telescopic rods disposed within the sleeves and capable of telescopic movement relative to the sleeves.

[0034] Furthermore, in the transport state, the gantry cranes are fixed to the longitudinal guide rails at longitudinal intervals to accommodate vehicle limits. In the placement operation state, once the previous gantry crane is deployed, the next gantry crane is transported to a designated location via the longitudinal guide rails and gripped and flipped by the retracting device. In the recovery operation state, once the previous gantry crane is retrieved, the longitudinal guide rails move to make room for the next gantry crane, which is gripped and flipped by the retracting device and placed at a designated location, where it is retrieved by the longitudinal guide rails.

[0035] Furthermore, the second transport flat car is provided with large rails, and the new large rails are transported to the work site by the second transport flat car. The retractable device unloads the gantry cranes one by one from the first transport flat car according to the position and sequence, and places them at the designated position. Then, the new large rails are unloaded from the second transport flat car by a group crane consisting of multiple gantry cranes and placed on one side of the line below the gantry crane. The dismantled old large rails are hoisted to the other side of the line below the gantry crane by the group crane. The new large rails are then hoisted to the position of the original old large rails on the line by the group crane to complete the replacement of the old and new large rails. After the line is restored, the old large rails are lifted by the group crane, the second transport flat car enters, and after the old large rails are placed on the second transport flat car, the gantry cranes on the line are retracted one by one to the first transport flat car by the retractable device, and the group is assembled and driven away.

[0036] Furthermore, in the placement operation state, after the retractable device clamps the first gantry crane and flips it over to the placement position, the legs of the gantry crane move to both sides of the crossbeam, the leveling legs extend downward to near the ground, the clamping mechanism of the retractable device releases, and the leveling legs extend to level the gantry crane. The first transport flat car moves forward, and the above gantry crane placement operation is repeated until all gantry cranes are placed in the designated position and leveled.

[0037] Furthermore, during the recovery operation, the old track large rail is lifted by the group crane. The second transport flatcar drives in the opposite direction. After the group crane places the old track large rail on the second transport flatcar, the lifting chain of the gantry crane is released. The marshaling unit continues to travel in the opposite direction, and the retracting device retracts the gantry cranes one by one onto the first transport flatcar. When all gantry cranes are retracted, all equipment is secured to the first and second transport flatcars, and the marshaling unit departs, completing the re-laying operation.

[0038] Furthermore, during the replacement operation, the lifting chain of the gantry crane device is connected to the new track large rail, and the new track large rail is lifted. The second transport flat car continues to move forward until it leaves the operation area. The new track large rail is moved horizontally to the side close to the support leg and placed steadily. The old track large rail is lifted and moved horizontally and placed on the other side. The new track large rail is then lifted and placed in the position of the old track large rail to complete the replacement of the new and old track large rails.

[0039] Furthermore, a power device is provided between the two longitudinally movable guide rails arranged parallel to each other, and the power device can provide operating power for the retracting and extending device.

[0040] By implementing the technical solution of the track large rail member replacement operation system provided by the present application, the following beneficial effects are achieved:

[0041] (1) The large rail replacement operation system of the present application has a more simplified structure of the gantry crane retracting and extending device. The original lifting, rotating, and clamping retracting mechanism is changed to a flip-type retracting and extending structure for placing and retrieving the gantry crane. When the gantry crane is retracted, it does not need to be lifted or rotated, and can be directly retracted and extended in a flip-type manner, which shortens the operation time and is more convenient.

[0042] (2) The large rail replacement operation system of the present application has a more simplified gantry crane structure. The crossbeam adopts a three-section folding arm structure. The gantry crane can be placed on a flatbed truck without rotating it, so that the transportation process does not exceed the limit. At the same time, the legs of the gantry crane only need to adopt a one-stage lifting structure for leveling, which further simplifies the operation process and greatly reduces costs.

[0043] (3) The large rail component laying and replacing operation system of the present application has a gantry crane device with a three-section folding arm beam structure and a retractable and retractable device with a flip-type retractable and retractable structure, which greatly improves the transportation capacity of the gantry crane device on a single flatbed truck. Since the gantry crane device of the original structure is placed longitudinally after rotation and is long, a single vehicle can only accommodate about 4 gantry crane devices. However, since the present application adopts a horizontal placement of the gantry crane device, a single vehicle can accommodate more than 6 gantry crane devices. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] To more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other embodiments can be derived from these drawings without inventive effort.

[0045] Figure 1 This is a front structural diagram of a gantry crane device in a specific embodiment of the track large rail member replacement operation system of the present application;

[0046] Figure 2 This is a schematic top view of the structure of a door hanging device in a specific embodiment of the track large rail member laying and replacing operation system of the present application;

[0047] Figure 3 This is a side structural diagram of a door hanging device in a specific embodiment of the track large rail member laying and replacing operation system of the present application;

[0048] Figure 4 This is a front structural diagram of a door hanging device in a folded state in a specific embodiment of the track large rail member laying and replacing operation system of the present application;

[0049] Figure 5This is a schematic top view of the structure of the door hanging device in a folded state in a specific embodiment of the track large rail member laying and replacing operation system of the present application;

[0050] Figure 6 This is a schematic side structural diagram of a door hanging device in a folded state in a specific embodiment of the track large rail member laying and replacing operation system of the present application;

[0051] Figure 7 This is a schematic diagram of the three-dimensional structure of a gantry crane device in a specific embodiment of the track large rail member replacement operation system of the present application;

[0052] Figure 8 This is a schematic side view of the installation structure of the retracting and extending device in a specific embodiment of the track large rail member laying and replacing operation system of the present application;

[0053] Figure 9 This is a schematic top view of the installation structure of the retracting and extending device of a specific embodiment of the track large rail member laying and replacing operation system of the present application;

[0054] Figure 10 This is a schematic front view of the installation structure of the retracting and extending device in a specific embodiment of the track large rail member laying and replacing operation system of the present application;

[0055] Figure 11 This is a side structural diagram of a retracting and extending device in a specific embodiment of the track large rail member laying and replacing operation system of the present application;

[0056] Figure 12 This is a side structural diagram of a retractable device in operation in a specific embodiment of the track large rail member replacement operation system of the present application;

[0057] Figure 13 This is a schematic top view of the structure of the retractable device in the operating state in a specific embodiment of the track large rail member laying and replacing operation system of the present application;

[0058] Figure 14 This is a schematic front view of the structure of the retractable device in the operating state in a specific embodiment of the track large rail member replacement operation system of the present application;

[0059] Figure 15 This is a three-dimensional schematic diagram of a retractable device in operation in a specific embodiment of the track large rail member replacement operation system of the present application;

[0060] Figure 16 This is a three-dimensional schematic diagram of the operating state of the retracting and extending device in a specific embodiment of the track large rail member laying and replacing operation system of the present application from another perspective;

[0061] Figure 17 This is a three-dimensional schematic diagram of the operating state of the retracting and extending device in a specific embodiment of the track large rail member laying and replacing operation system of the present application at a third viewing angle;

[0062] Figure 18 This is a side view of the operating principle of the retracting and extending device of a specific embodiment of the track large rail member laying and replacing operation system of the present application;

[0063] Figure 19 This is a top view of the operating principle of the retracting and extending device of a specific embodiment of the track large rail member laying and replacing operation system of the present application;

[0064] Figure 20 This is a schematic diagram of the operating principle of the retracting and extending device of a specific embodiment of the track large rail member replacement operation system of the present application in the viewing direction A;

[0065] Figure 21 This is a schematic diagram of the operating principle of the retracting and extending device of a specific embodiment of the track large rail member replacement operation system of the present application in the B viewing direction;

[0066] Figure 22 This is a schematic diagram of the operating principle of the retracting and extending device of a specific embodiment of the track large rail member replacement operation system of the present application in the C viewing direction;

[0067] Figure 23 This is a schematic front view of the structure of a specific embodiment of the track large rail member replacement operation method based on the system of the present application in the transportation state;

[0068] Figure 24 This is a schematic top view of the structure of a specific embodiment of the track large rail member replacement operation method based on the system of the present application in the transportation state;

[0069] Figure 25 This is a schematic front view of the structure of a specific embodiment of the track large rail replacement operation method based on the system of the present application, when the retracting and extending device is in operation;

[0070] Figure 26 This is a schematic top view of the structure of a specific embodiment of the track large rail replacement operation method based on the system of the present application, when the retracting and extending device is in operation;

[0071] Figure 27 This is a schematic diagram of the operating state of the retracting and extending device of a specific embodiment of the large rail member laying and replacing operation method based on the system of the present application;

[0072] Figure 28 This is a schematic diagram of the operating state of the retracting and extending device from another perspective, according to a specific embodiment of the large rail member replacement operation method based on the system of the present application;

[0073] Figure 29 This is a schematic diagram of the operating state of the retracting and extending device from a third perspective, according to a specific embodiment of the large rail member replacement operation method based on the system of the present application;

[0074] Figure 30 This is a schematic front view of the structure of a specific embodiment of the track large rail replacement operation method based on the system of the present application, when the door hanging device is placed;

[0075] Figure 31 This is a schematic top view of the structure of a specific embodiment of the track large rail replacement operation method based on the system of the present application, when the door hanging device is placed;

[0076] Figure 32 This is a schematic front view of the structure of a specific embodiment of the track large rail replacement operation method based on the system of the present application in the state of unloading operation of the new track large rail;

[0077] Figure 33 This is a schematic top view of the structure of a specific embodiment of the track large rail replacement operation method based on the system of the present application in the state of unloading operation of the new track large rail;

[0078] Figure 34 This is a schematic top view of the structure of a specific embodiment of the track large rail replacement operation method based on the system of the present application in the state of the new track large rail replacement operation;

[0079] Figure 35 This is a schematic diagram of the gantry crane recovery operation state of a specific embodiment of the track large rail member replacement operation method based on the system of the present application;

[0080] Figure 36 This is a schematic diagram of the gantry crane recovery operation state from another perspective of a specific embodiment of the track large rail member replacement operation method based on the system of the present application;

[0081] Figure 37 This is a schematic diagram of the gantry crane recovery operation state from a third perspective, according to a specific embodiment of the track large rail member replacement operation method based on the system of the present application;

[0082] In the figure: 1-door crane device, 2-retractable device, 3-first transport flat car, 4-second transport flat car, 5-rail car, 6-power unit, 7-rail large rail, 71-new rail large rail, 72-old rail large rail, 8-longitudinal guide rail, 9-rail, 101-main beam, 102-folding arm, 103-main support leg, 104-sleeve, 105-telescopic rod, 106-lifting mechanism, 107-transverse sliding frame, 108-lifting chain, 109-folding drive mechanism, 110-bracket, 201-turning frame, 202-base, 203-turning drive mechanism, 204-clamping mechanism, 205-connecting rod. DETAILED DESCRIPTION

[0083] To make the purpose, technical solutions, and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0084] As attached Figure 1 To the attached Figure 37 As shown, a specific embodiment of the track large rail member laying and replacing operation system of the present application is given, and the present application is further explained below in conjunction with the drawings and specific embodiments.

[0085] Example 1

[0086] As attached Figure 1 To the attached Figure 22 As shown, an embodiment of the track large rail member replacement operation system of the present application specifically includes:

[0087] The marshaled rail car 5, the first transport flat car 3 and the second transport flat car 4;

[0088] In the transport state, folded horizontally (such as attached Figure 9 and attached Figure 13 No less than two door hanging devices 1 are placed on the first transport flat car 3 (in the direction shown by T in the middle);

[0089] The retractable device 2 is arranged on the first transport flat car 3 or the second transport flat car 4, and can realize the placement or recovery of the door hanging device 1. For example, in this embodiment, the retractable device 2 is specifically arranged on the first transport flat car 3 along the longitudinal direction (such as the attached Figure 8 and attached Figure 9 On one side of the direction shown by L in the figure, and is arranged close to the second transport flat car 4.

[0090] Two longitudinal guide rails 8 are provided on the first transport flat car 3 in parallel with each other in the longitudinal direction, and a power unit 6 is provided between the two longitudinal guide rails 8. The power unit 6 can provide operating power for the retractable device 2. Among them, the power unit 6 can be of different types: battery-driven or generator-driven, and the actuator can be electrically driven or hydraulically driven, etc. Each group of folding gantry crane devices 1 adopts a separate drive or a centralized and unified power drive mode. When the gantry crane device is placed in the operating state, the gantry crane device 1 is transported to the designated position through the longitudinal guide rails 8 provided on the first transport flat car 3, and is clamped and flipped by the retractable device 2. The gantry crane device 1 is placed on the line after being extended to the normal state.

[0091] As attached Figure 1 To the attached Figure 7 As shown, the door hanging device 1 further includes:

[0092] The crossbeam further includes a main beam 101 and folding arms 102 hinged to the left and right sides of the main beam 101;

[0093] The transverse sliding frame 107 can be movably arranged at the left and right ends of the beam, and the transverse sliding frame 107 can move along the transverse direction of the beam (such as the attached Figure 7 Move in the direction indicated by W in the figure to adjust the horizontal span of the door hanging device 1;

[0094] A lifting mechanism 106 is provided on the crossbeam and located between two transverse sliding frames 107, and can move transversely along the crossbeam to adjust the transverse lifting position of the track large rail member 7;

[0095] A lifting chain 108 connected to the lifting mechanism 106 for lifting the large track member 7;

[0096] They are respectively arranged below the two transverse sliding frames 107 and can move vertically (such as the attached Figure 7 The legs are telescopic (in the direction shown by H in the figure) to adjust the height of the beam from the horizontal plane of the line and to achieve leveling of the door hanging device 1 at the same time.

[0097] The transverse sliding frame 107 is sleeved on the outside of the crossbeam, and a folding drive mechanism 109 is hinged between the main beam 101 and the folding arm 102. When the retracting device 2 places the door hanging device 1, the folding drive mechanism 109 can drive the folding arm 102 to unfold relative to the main beam 101, and the transverse sliding frame 107 moves toward the outside of the crossbeam to increase the horizontal span of the door hanging device 1 and expand the operating adaptability range. When the retracting device 2 retracts the door hanging device 1, the folding drive mechanism 109 can drive the folding arm 102 to shrink relative to the main beam 101 to reduce the overall width of the door hanging device 1 and avoid the door hanging device 1 from exceeding the limit during transportation. As shown in the attached figure Figure 1 To the attached Figure 3 The door hanging device 1 is shown in the unfolded state. Figure 4 To the attached Figure 7 The door hanger 1 is shown in the folded state.

[0098] As a typical embodiment of the present application, the crossbeam can be further specifically adopted as: I-shaped structure, the crossbeam and the transverse sliding frame 107 can be specifically adopted as a structure of a guide rail and a sliding sleeve, and the transverse sliding frame 107 is driven by a structure such as an oil cylinder, an electric cylinder or an electric screw rod to move along the length direction of the crossbeam (such as the attached Figure 7 The hoisting mechanism 106 can be a hoist or other lifting device. The legs are retractable and can slide on the crossbeam to adjust the span and height of the folding gantry crane 1 to adapt to different site conditions and the replacement of large rail members 7 of different sizes.

[0099] The support legs further include a main support leg 103 disposed below two transverse sliding frames 106, a bracket 110 fixed below the main support leg 103, and leveling legs disposed on the left and right sides of the bracket 110. The leveling legs further include sleeves 104 fixed to the left and right sides of the bracket 110, and telescopic rods 105 disposed within the sleeves 104 and capable of telescopic movement relative to the sleeves 104. Two telescopic leveling legs are disposed at the bottom of each leg to achieve leveling of the door hanging device 1. The telescopic movement can be achieved using a hydraulic cylinder, an electric cylinder, or an electric lead screw.

[0100] The gantry crane 1 described in Example 1 solves the technical problems of existing operating equipment, such as large size, easy overrunning of railway limits, high cost, prolonged window occupancy, low operating efficiency, and low safety. Its structure is simplified, and its crossbeam adopts a three-section folding arm structure. This allows the gantry crane 1 to be placed on a transport flatcar without rotating it, ensuring that it remains within the limits during transportation. Furthermore, the legs of the gantry crane 1 only require a single-stage lifting mechanism for leveling, further simplifying the operation process and significantly reducing costs.

[0101] As attached Figure 8 To the attached Figure 11 As shown, the retracting device 2 further includes:

[0102] A base 202 fixed to the body of the first transport flat car 3 or the second transport flat car 4;

[0103] A flip frame 201 having one end hinged to the base 202 and the other end extending upward;

[0104] A turning drive mechanism 203 hinged between the base 202 and the turning frame 201;

[0105] A clamping mechanism 204 is hinged to the top of the turning frame 201 and is used to clamp the large rail member 7;

[0106] and a connecting rod 205 hinged between the clamping mechanism 204 and the base 202 .

[0107] The turning frame 201, the base 202, the turning frame clamping mechanism 204 and the connecting rod 205 further form a four-bar linkage mechanism. The turning frame 201 can be driven by the turning drive mechanism 203 to move forward and backward relative to the base 202 (as shown in the attached figure). Figure 8 and attached Figure 11 F in the middle) to perform flipping motion.

[0108] The retracting device 2 is used to unload the door hanging device 1 from the first transport flat car 3 to the line, and to retract it from the line to the first transport flat car 3. The retracting device 2 can realize the foldable door hanging device 1 to be quickly placed on the line, and quickly retracted from the line to the transport flat car. Figure 12 and attached Figure 13 The two transport flat cars (in the direction shown by L) are fixed on the first transport flat car 3 at intervals to adapt to the vehicle limit.

[0109] As a typical specific embodiment of the present application, the operating system includes one or more second transport flat cars 4, on which large rail components 7 are placed. The rail car 5, the first transport flat car 3 and the second transport flat car 4 are connected in sequence, and 6 to 8 gantry cranes 1 are placed on the first transport flat car 3. The transportation of the large rail component laying and replacing operating system adopts the rail car 5, the first transport flat car 3 loaded with the gantry crane 1, and the second transport flat car 4 transporting the large rail components 7. A modified transport flat car transports multiple folding gantry cranes 1, and two ordinary transport flat cars transport new and old large rail components.

[0110] The track replacement system utilizes a cluster of multiple (typically 6-8) foldable gantry cranes (1). These cranes' legs are retractable and can slide on beams, adjusting the span and height of the foldable gantry cranes (1) to accommodate varying site conditions and the replacement of track components (7) of varying sizes. Four retractable leveling legs are located below each leg to achieve leveling of the gantry cranes (1). These legs are retracted and adjusted using hydraulic cylinders or electric screws. The lifting mechanism (106) can also utilize a hoist or other lifting device.

[0111] As attached Figure 12 To the attached Figure 14 As shown, the door hanging device 1 is fixed on the longitudinal guide rail 8 along the longitudinal interval in the transport state to adapt to the vehicle limit. The operating state of the retracting device 2 includes the placing operating state and the retracting operating state of the door hanging device 1. Figure 15 To the attached Figure 17 As shown, in the door hanging device placement operation state, when the current door hanging device 1 is arranged, the next door hanging device 1 is transported to the designated position by the longitudinal guide rail 8 and is clamped and turned over by the retracting device 2. In the door hanging device recovery operation state, when the current door hanging device 1 is recovered, the longitudinal guide rail 8 moves and leaves a position, and the next door hanging device 1 is clamped, turned over and placed at the designated position by the retracting device 2 and is recovered by the longitudinal guide rail 8. It should be noted that, as shown in the attached Figure 18 To the attached Figure 20 The illustration is merely a schematic diagram for explaining the operating principle of the retractable device 2 , and does not mean that the retractable device 2 is provided on both sides of the first transport flat car 3 in the longitudinal direction.

[0112] The second transport flat car 4 is equipped with a large track member 7. The new large track member 71 is transported to the work site by the second transport flat car 4. The retractable device 2 unloads the gantry crane 1 from the first transport flat car 3 one by one according to the position and sequence, and places it in the designated position. Then, the new large track member 71 is unloaded from the second transport flat car 4 and placed on the side of the line below the gantry crane 1 by a group crane consisting of multiple gantry cranes 1. The dismantled old large track member 72 is hoisted to the other side of the line below the gantry crane 1 by the group crane. The new large track member 71 is then hoisted to the position of the original old large track member 72 on the line by the group crane to complete the replacement of the old and new large track members. After the line is restored, the old large track member 72 is lifted by the group crane, the second transport flat car 4 enters, and after the old large track member 72 is placed on the second transport flat car 4, the retractable device 2 retracts the gantry cranes 1 on the line one by one to the first transport flat car 3, and the group is driven away.

[0113] As attached Figure 21 As shown, in the gantry crane placement operation state, after the retracting and unfolding device 2 clamps the first gantry crane 1 and flips it over to the placement position, the legs of the gantry crane 1 move to both sides of the crossbeam, the leveling legs extend downward to close to the ground, the clamping mechanism 204 of the retracting and unfolding device 2 is released, and the leveling legs extend to level the gantry crane 1. The first transport flat car 3 moves forward, and the above gantry crane 1 placement operation is repeated until all gantry cranes 1 are placed in the designated position and leveled.

[0114] In the state of the door crane recovery operation, the old track large rail 72 is lifted by the group crane, and the second transport flat car 4 is in the opposite direction (i.e., with the attached Figure 23 、 24 , 25, 26, 30 and 31) in the opposite direction, the group crane places the old track large rail 72 on the second transport flat car 4, and the lifting chain 108 of the door crane device 1 is released. The marshaling group continues to move in the opposite direction, and the door crane devices 1 are recovered one by one to the first transport flat car 3 through the retracting device 2, as shown in the attached figure. Figure 22 When all the door hanging devices 1 are recovered, all the equipment are fixed on the first transport flat car 3 and the second transport flat car 4, and the group is set to leave, completing the laying and changing operation.

[0115] During the track rail replacement operation, the lifting chain 108 of the gantry crane 1 is connected to the new track rail 71, and the new track rail 71 is lifted. The second transport flat car 4 continues to move forward until it leaves the operation area. The new track rail 71 is moved horizontally to the side close to the support leg and placed steadily. The old track rail 72 is lifted and moved horizontally and placed on the other side. Then the new track rail 71 is lifted and placed in the position of the old track rail 72 to complete the replacement of the new and old track rails.

[0116] The large track rail component replacement operation system described in Example 1 can solve technical problems such as large deformation, large swing, low operation efficiency, and long skylight occupancy time during on-site lifting and replacement operations of large track rail components. By adopting multiple folding-structure gantry cranes 1 to simultaneously lift and replace large track rail components, it not only has a simple structure, saves space, and is easy to operate, but also the entire system has low cost, requires fewer operators, and greatly reduces the skylight occupancy time.

[0117] Example 2

[0118] In this embodiment, other auxiliary process flows such as confirmation of the support points of the gantry crane device, leveling of the support points, removal of rail fasteners, rail cutting, welding, grinding and adjustment are omitted. The following takes the replacement of the switch core (a typical large rail component 7) as an example to explain in detail the main process of the large rail component replacement operation method.

[0119] Attachment Figure 23 To the attached Figure 37 As shown, an embodiment of a track large rail member replacement operation method based on the system described in Example 1 specifically includes the following steps:

[0120] S1) As attached Figure 23 and attached Figure 24 As shown, a plurality of (e.g., 6 to 8) gantry crane devices 1 are placed in a folded state transversely on the longitudinal guide rails 8 of the first transport flat car 3 (a modified flat car is used) (to adapt to the vehicle limit), and the new track large rails 71 are placed on two second transport flat cars 4 (ordinary flat cars are used). The first transport flat car 3, the second transport flat car 4 and the rail car 5 are combined and connected to travel to the designated location of the replacement operation site;

[0121] S2) As attached Figure 25 To the attached Figure 29 As shown, the vehicle group moves in the direction shown by L, and the door hanging devices 1 are clamped and flipped one by one by the retractable device 2. At the same time, the door hanging devices 1 are restored to the unfolded state and unloaded from the first transport flat car 3 according to the position and sequence, and placed in the designated position, as shown in the attached figure. Figure 30 and attached Figure 31 As shown;

[0122] S3) As attached Figure 32 and attached Figure 33 As shown, the new track large rail 71 is unloaded from the second transport flat car 4 by a group crane composed of multiple gantry crane devices 1 and placed on the side of the track below the gantry crane device 1;

[0123] S4) As attached Figure 34 As shown, the dismantled old track large rail member 72 is hoisted to the other side of the line below the gantry crane device 1 by group hoisting;

[0124] S5) hoisting the new track large rail member 71 to the position of the original old track large rail member 72 on the line by group hoisting to complete the replacement of the new and old track large rail members;

[0125] S6) After the line is restored, the old track large rail 72 is lifted by the group crane, and the second transport flat car 4 is moved towards the adjacent Figure 23 、 24 , 25, 26, 30 and 31 in the opposite direction of L, after placing the old track large rail 72 on the second transport flat car 4 by group lifting, release the lifting chain clamp of the door crane device 1;

[0126] S7) The vehicle group continues to move in the opposite direction to that indicated by L, and the door hanging devices 1 on the line are clamped and turned over one by one by the retracting device 2, and then restored to the folded state and recovered to the first transport flat car 3, as shown in the attached figure. Figure 35 To the attached Figure 37 As shown;

[0127] S8) After the gantry crane device 1 is recovered, it is placed horizontally on the first transport flat car 3 in a folded state, and all equipment is fixed on the transport flat car. The first transport flat car 3, the second transport flat car 4 and the rail car 5 are assembled and driven away in the direction indicated by L, completing the laying and replacement operation.

[0128] Among them, two longitudinal guide rails 8 are arranged parallel to each other along the longitudinal direction on the first transport flat car 3, and a power device 6 is arranged between the two longitudinal guide rails 8. The power device 6 can provide operating power for the retracting and unfolding device 2.

[0129] In step S2), when the gantry crane device is in the placement operation state, the gantry crane device 1 is transported to the designated position through the longitudinal guide rail 8 arranged on the first transport flat car 3, and is clamped and flipped by the retracting device 2. After the gantry crane device 1 is extended to the normal state, it is placed on the line.

[0130] The door hanging device 1 further includes: a crossbeam, a transverse sliding frame 107, a lifting mechanism 106, a lifting chain 108 and a support leg. The crossbeam further includes a main beam 101, and a folding arm 102 is hinged on the left and right sides of the main beam 101. The transverse sliding frames 107 are movably set at the left and right ends of the crossbeam 101, and the transverse sliding frames 107 can move laterally along the crossbeam to adjust the transverse span of the door hanging device 1. A lifting mechanism 106 is set on the crossbeam located between the two transverse sliding frames 107, and the lifting mechanism 106 can move laterally along the crossbeam to adjust the transverse lifting position of the track large rail member 7. The lifting chain 108 is connected to the lifting mechanism 106 for lifting the track large rail member 7. Support legs are respectively set under the two transverse sliding frames 107, and the support legs can be extended and retracted in the vertical direction to adjust the height of the crossbeam from the horizontal plane of the line, and at the same time realize the leveling of the door hanging device 1.

[0131] The transverse sliding frame 107 is mounted on the outside of the crossbeam, and one end of the folding drive mechanism 109 is hinged to the main beam 101, and the other end is hinged to the folding arm 102. When the retracting device 2 places the door hanger 1, the folding drive mechanism 109 drives the folding arm 102 to unfold relative to the main beam 101, and the transverse sliding frame 107 moves toward the outside of the crossbeam to increase the lateral span of the door hanger 1. When the retracting device 2 retracts the door hanger 1, the folding drive mechanism 109 drives the folding arm 102 to retract relative to the main beam 101, and the transverse sliding frame 107 moves toward the inside of the crossbeam to reduce the overall width of the door hanger 1.

[0132] The folding and unfolding device 2 further includes: a turning frame 201, a base 202, a turning drive mechanism 203, a clamping mechanism 204 and a connecting rod 205. The base 202 is fixed to the body of the first transport flat car 3 or the second transport flat car 4. One end of the turning frame 201 is hinged to the base 202, and the other end extends upward and is hinged to the clamping mechanism 204. The clamping mechanism 204 can clamp the large rail member 7. One end of the turning drive mechanism 203 is hinged to the base 202, and the other end is hinged to the turning frame 201. One end of the connecting rod 205 is hinged to the clamping mechanism 204, and the other end is hinged to the base 202. The turning frame 201, the base 202, the clamping mechanism 204 and the connecting rod 205 form a four-bar linkage. The turning frame 201 can be turned forward and backward relative to the base 202 under the drive of the turning drive mechanism 203.

[0133] The legs further include a main leg 103, a bracket 110, and a leveling leg. The main leg 103 is disposed below the two transverse sliding frames 107. The bracket 110 is fixed below the main leg 103. The leveling legs are disposed on the left and right sides of the bracket 110. The leveling legs further include a sleeve 104 and a telescopic rod 105. The sleeve 104 is fixed to the left and right sides of the bracket 110. The telescopic rod 105 is disposed inside the sleeve 104 and can be extended and retracted relative to the sleeve 104.

[0134] In the transport state of step S1) and step S8), the door crane 1 is fixed on the longitudinal guide rail 8 at longitudinal intervals to adapt to the vehicle limit. In the door crane placement operation state of step S2), when the current door crane 1 is arranged, the next door crane 1 is transported to the designated position via the longitudinal guide rail 8 and clamped and turned over by the retracting device 2. In the door crane recovery operation state of step S7), when the current door crane 1 is recovered, the longitudinal guide rail 8 moves to leave space, and the next door crane 1 is clamped, turned over, and placed at the designated position by the retracting device 2 and recovered by the longitudinal guide rail 8.

[0135] In the door crane placement operation state of step S2), after the retracting and unfolding device 2 clamps the first door crane 1 and flips it over to the placement position, the legs of the door crane 1 move to both sides of the beam, and the leveling legs extend downward to close to the ground. The clamping mechanism 204 of the retracting and unfolding device 2 is released, and the leveling legs extend to level the door crane 1. The first transport flat car 3 moves forward, and the above-mentioned door crane 1 placement operation is repeated until all door cranes 1 are placed in the designated position and leveled.

[0136] In the recovery operation state of the door crane device in step S7), the old track large rail member 72 is lifted by the group crane, and the second transport flat car 4 is in the opposite direction (i.e., with the attached Figure 23 、 24 , 25, 26, 30 and 31) and the group crane places the old track large rail 72 on the second transport flat car 4. Then the lifting chain 108 of the gantry crane 1 is released. The vehicle group continues to move in the opposite direction, and the gantry cranes 1 are retrieved one by one onto the first transport flat car 3 through the retracting device 2.

[0137] During the track rail replacement operation state of step S3) to step S6), the lifting chain 108 of the gantry crane 1 hangs the new track rail 71, lifts the new track rail 71, and the second transport flat car 4 continues to move forward until it leaves the operation area. The new track rail 71 is moved horizontally to the side close to the support leg and placed steadily through the group crane, the old track rail 72 is hoisted and moved horizontally and placed on the other side, and then the new track rail 71 is hoisted and placed in the position of the original old track rail 72 to complete the replacement of the new and old track rails.

[0138] In the description of this application, it should be noted that when an element is referred to as being "fixed on" or "set on" another element, it can be directly on the other element or indirectly set on the other element; when an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0139] It should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0140] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of the features. Throughout the description of this application, "plurality" or "several" means two or more, unless otherwise specifically defined.

[0141] It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the conditions under which this application can be implemented. Therefore, they have no technical significance. Any structural modification, change in proportional relationship or adjustment of size should still fall within the scope of the technical content disclosed in this application without affecting the efficacy and purpose that can be achieved by this application.

[0142] By implementing the technical solution of the track large rail member replacement operation system described in the specific embodiments of this application, the following technical effects can be achieved:

[0143] (1) The track large rail member laying and replacing operation system described in the specific embodiment of the present application has a more simplified structure of the gantry crane retracting and releasing device. The original lifting, rotating, and clamping retracting and releasing mechanism is changed to a flipping retracting and releasing structure for placing and retrieving the gantry crane. When the gantry crane is retracted and released, it does not need to be lifted or rotated, and can be directly retracted and released in a flipping manner. By using multiple folding gantry cranes to lift and replace the track large rail members, fewer operators are required, the operation time is shortened, and the process is simpler, clearer, and more convenient;

[0144] (2) The large rail piece laying and replacing operation system described in the specific embodiment of the present application has a more simplified gantry crane structure. The foldable crossbeam adopts a three-section folding arm structure and is horizontally installed on a flat car during transportation. The gantry crane does not need to be rotated to be placed on the flat car, so that the transportation process does not exceed the limit. At the same time, the legs of the gantry crane only need to adopt a one-level lifting structure for leveling, which further simplifies the operation process and greatly reduces the cost. The group lifting operation composed of multiple gantry cranes makes the positioning of large rail pieces more accurate and the laying and replacing operation safer and more reliable.

[0145] (3) The track large rail component replacement operation system described in the specific embodiment of the present application has a gantry crane device that adopts a three-section folding arm beam structure and a retractable and retractable device that adopts a flip-type retractable and retractable structure, which greatly improves the transportation capacity of the gantry crane device on a single flatbed truck. Since the gantry crane device of the original structure is placed longitudinally after rotation and is long, a single vehicle can only accommodate about 4 gantry crane devices. However, since the present application adopts a horizontal placement of the gantry crane device, a single vehicle can accommodate more than 6 gantry crane devices.

[0146] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0147] The above description is only a preferred embodiment of the present application and does not constitute any formal limitation to the present application. Although the present application has been disclosed as above with a preferred embodiment, it is not intended to limit the present application. Any technician familiar with the art can use the above-disclosed methods and technical contents to make many possible changes and modifications to the technical solution of the present application, or modify it into an equivalent embodiment with equivalent changes, without departing from the spirit and technical solution of the present application. Therefore, any simple modification, equivalent replacement, equivalent change and modification made to the above embodiments based on the technical essence of the present application without departing from the content of the technical solution of the present application still falls within the scope of protection of the technical solution of the present application.

Claims

1. A track large rail member laying and replacing operation system, characterized in that: include: The marshaled railcar, the first transport flatcar and the second transport flatcar; At least two door hanging devices are placed transversely on the first transport flat car in a folded manner in the transport state; A retractable device is provided on the first transport flat car or the second transport flat car and can realize the placement or recovery of the door hanging device through a flip structure; In the placement operation state, the door hanging device is transported to the designated position by the longitudinal guide rail provided on the first transport flat car, and is clamped and turned over by the retracting device. The door hanging device is placed on the line after being extended to the normal state; The door hanging device comprises: The crossbeam further comprises a main beam and folding arms hinged to the left and right sides of the main beam respectively; Transverse sliding frames are movably arranged at the left and right ends of the beam, and the transverse sliding frames can move laterally along the beam to adjust the transverse span of the door hanging device; A lifting mechanism is provided on the crossbeam and located between the two transverse sliding frames, and can move laterally along the crossbeam to adjust the transverse lifting position of the track large rail member; A lifting chain connected to the lifting mechanism for lifting large track components; The legs are respectively arranged under the two transverse sliding frames and can be extended and retracted in the vertical direction to adjust the height of the beam from the horizontal plane of the line and realize the leveling of the door hanging device; The retractable device comprises: A base fixed to the body of the first transport flat car or the second transport flat car; a flip frame with one end hinged to the base and the other end extending upward; A turning drive mechanism hinged between the base and the turning frame; A clamping mechanism hinged to the top of the turning frame for clamping the large rail member; and a connecting rod hinged between the clamping mechanism and the base; The turning frame, the base, the turning frame clamping mechanism and the connecting rod form a four-bar linkage mechanism. The turning frame can be turned over in the front-back direction relative to the base under the drive of the turning drive mechanism.

2. The track large rail member laying and replacing system according to claim 1, characterized in that: The transverse sliding frame is mounted on the outside of the crossbeam, and a folding drive mechanism is hinged between the main beam and the folding arm; when the retracting device places the door hanging device, the folding drive mechanism can drive the folding arm to unfold relative to the main beam, and the transverse sliding frame moves toward the outside of the crossbeam to increase the transverse span of the door hanging device; when the retracting device retracts the door hanging device, the folding drive mechanism can drive the folding arm to shrink relative to the main beam, and the transverse sliding frame moves toward the inside of the crossbeam to reduce the overall width of the door hanging device.

3. The track large rail member laying and replacing system according to claim 2, characterized in that: The support legs include a main support leg arranged below the two transverse sliding frames, a bracket fixed below the main support leg, and a leveling support leg arranged on the left and right sides of the bracket; the leveling support leg further includes a sleeve fixed on the left and right sides of the bracket, and a telescopic rod arranged inside the sleeve and capable of telescopic movement relative to the sleeve.

4. The track large rail member laying and replacing system according to claim 1, 2 or 3, characterized in that: In the transport state, the door crane device is fixed on the longitudinal guide rail along the longitudinal interval to adapt to the vehicle limit; in the placement operation state, when the current door crane device is arranged, the next door crane device is transported to the designated position through the longitudinal guide rail and clamped and flipped by the retracting device; in the recovery operation state, when the current door crane device is recovered, the longitudinal guide rail moves and leaves space, and the next door crane device is clamped, flipped and placed at the designated position through the retracting device and recovered through the longitudinal guide rail.

5. The track large rail member laying and replacing system according to claim 4, characterized in that: The second transport flat car is provided with large rail members, and the new large rail members are transported to the work site by the second transport flat car, and the retracting and unloading device unloads the gantry crane devices one by one from the first transport flat car according to the position and sequence, and places them at the designated position; then the new large rail members are unloaded from the second transport flat car by a group crane composed of multiple gantry crane devices and placed on one side of the line below the gantry crane device; the dismantled old large rail members are hoisted to the other side of the line below the gantry crane device by the group crane; and then the new large rail members are hoisted to the position of the original old large rail members on the line by the group crane to complete the replacement of the old and new large rail members; after the line is restored, the old large rail members are lifted by the group crane, the second transport flat car drives in, and after placing the old large rail members on the second transport flat car, the gantry crane devices on the line are retracted one by one to the first transport flat car by the retracting and unloading device, and the group drives away.

6. The track large rail member laying and replacing system according to claim 1, 2, 3 or 5, characterized in that: In the placement operation state, when the retracting device clamps the first gantry crane device and flips it over the placement position, the legs of the gantry crane device move to both sides of the beam, and the leveling legs extend downward to close to the ground. The clamping mechanism of the retracting device is released, and each leveling leg extends to level the gantry crane device; the first transport flat car moves forward and repeats the above-mentioned gantry crane device placement action until all gantry crane devices are placed in the designated position and leveled.

7. The track large rail member laying and replacing system according to claim 6, characterized in that: In the recovery operation state, the old track large rail pieces are lifted by the group crane, and the second transport flat car drives in in the opposite direction. After the group crane places the old track large rail pieces on the second transport flat car, the lifting chain of the gantry crane device is loosened; the group continues to move in the opposite direction, and the gantry crane devices are recovered one by one to the first transport flat car through the retracting and releasing device; when all the gantry crane devices are recovered, all equipment is fixed on the first transport flat car and the second transport flat car, the group drives away, and the laying and replacement operation is completed.

8. The track large rail member laying and replacing system according to claim 1, 2, 3, 5 or 7, characterized in that: During the replacement operation, the lifting chain of the gantry crane device hangs the new track large rail part and lifts the new track large rail part. The second transport flat car continues to move forward until it leaves the operation area. The new track large rail part is moved horizontally to the side close to the support leg and placed stably through group lifting. The old track large rail part is lifted and moved horizontally and placed on the other side. Then the new track large rail part is lifted and placed in the position of the original old track large rail part to complete the replacement of the old and new track large rail parts.

9. The track large rail member laying and replacing system according to claim 8, characterized in that: A power device is also provided between the two longitudinally movable guide rails which are arranged parallel to each other in the longitudinal direction, and the power device can provide operating power for the retracting and extending device.

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