Buffering energy-absorbing device for bearing roller of mobile crossing frame

Abstract

The utility model relates to a buffering and energy absorbing device for a bearing roller of a movable type crossing frame, and belongs to the technical field of power line crossing construction mechanical equipment. According to the utility model, the instantaneous maximum value of the impact force is reduced by utilizing the characteristic of the impact force and changing the impact characteristic on the main bearing roller when the lead falls, so that the requirements on the bearing capacity of the mobile crossing frame and the crane are reduced. When a broken line or a running line accident occurs in an unfolded electric power circuit, the movable umbrella-shaped crossing frame bears the impact force of an accident electric power wire through the uppermost bearing roller group, the instantaneous peak value of the impact force is reduced through the buffer energy absorption devices at the two ends of the bearing rollers, and then the impact force is transmitted to the movable umbrella-shaped crossing frame and the crane. The instantaneous maximum value of the impact force is reduced by changing the characteristics of the impact process on the main bearing roller when the wire falls, so that the impact resistance of the crane and the movable umbrella-shaped crossing frame is remarkably improved, and the requirement on the bearing capacity of the movable crossing frame and the crane is reduced.

Description

Technical Field

[0001] The utility model relates to a buffer energy absorption device for a bearing roller of a mobile spanning frame, and belongs to the technical field of mechanized equipment for power line spanning construction. Background Art

[0002] In the line construction of power construction, it is inevitable to carry out triple-span operations, that is, to span highways, railways and power lines. To protect these facilities and ensure the safety of construction personnel, it is necessary to set up a spanning frame for protection. In triple-span operations, especially the contradiction of spanning energized lines is the most prominent. The main methods of traditional spanning frame erection or layout techniques are to use wood, bamboo or steel pipes as the main materials, and manually build the spanning frame from bottom to top on both sides of the object to be spanned to ensure the formation of a safe support device during line construction and meet the safety requirements of line construction; the traditional spanning frame erection construction is high-altitude operation, and there are great safety hazards during construction, and power outage operations must be carried out. However, ensuring the uninterrupted power supply of the power supply line is the social responsibility of the power industry and the service goal pursued. Therefore, when the line construction in power construction spans energized lines, ensuring power supply and ensuring safety are two difficult-to-reconcile contradictions, resulting in great difficulty in obtaining approval for the power outage application of the line construction department. In desperation, some construction units will even carry out illegal construction of completely non-power-outage spanning. Completely non-power-outage spanning construction means that when the erected line spans the energized line, the energized line to be spanned is not powered off during all construction processes from the layout of the spanning frame, the erection of the line construction to the withdrawal of the spanning frame.

[0003] In order to solve this difficult-to-reconcile contradiction, a mobile automatic and rapid deployment spanning frame is disclosed in the prior art, with the publication number of CN205452971U. This spanning frame realizes the protection of the object to be spanned by supporting the umbrella-shaped spanning frame above the object to be spanned through a truck crane. This mobile spanning frame has been widely used due to its safety, convenience, economy and the solution of the problems of manual high-altitude operation and near-electric operation.

[0004] However, since the mobile umbrella-shaped spanning frame needs to withstand the impact load of the falling conductor during construction, and with the continuous improvement of the requirements for the power transmission capacity of power lines in China's power grid construction, the erection height, conductor diameter, and the number of conductors forming the same phase are also increasing continuously. Therefore, the ability of the mobile umbrella-shaped spanning frame to withstand the impact load is also increasing continuously. As a device used in conjunction with a crane, the self-weight of the mobile umbrella-shaped spanning frame directly affects the selection of the crane's load-bearing capacity. Selecting a large crane not only increases the usage cost, but more importantly, the road passing ability will cause the large crane to be unable to reach some construction sites, directly affecting the application of the mobile umbrella-shaped spanning frame. Therefore, the lightweight design of the mobile umbrella-shaped spanning frame has always been one of the most important issues to be solved in the design of the mobile umbrella-shaped spanning frame. In engineering applications, the mobile umbrella-shaped spanning frame is used in combination with a crane, and the combination of the main impact part and the crane is a direct rigid connection. The main part affected by the falling conductor impact is the load-bearing roller located at the top of the mobile umbrella-shaped spanning frame. In the past, the design was to optimize the structure through force analysis to reduce the weight, but there is still a large gap between the result and the actual needs. Therefore, in order to reduce the weight of the mobile umbrella-shaped spanning frame, expand the application range, and ensure construction safety, it is necessary to use a special device to reduce the maximum instantaneous impact value of the impact load according to the characteristics of the maximum load borne by the mobile umbrella-shaped spanning frame, so as to improve the ability of the mobile umbrella-shaped spanning frame to withstand the impact load. Summary of the Invention

[0005] The purpose of the present utility model is to provide, in view of the deficiencies of the above-mentioned prior art, a buffer energy absorption device for the load-bearing roller of a mobile spanning frame, which can, when a power line stringing accident such as wire breakage or wire running occurs, enable the mobile umbrella-shaped spanning frame to withstand the impact force of the accident power conductor through the load-bearing roller group arranged at the top, reduce the instantaneous peak value of the impact force through the buffer energy absorption device installed at both ends of the load-bearing roller, and then transmit it to the mobile umbrella-shaped spanning frame and the crane, reducing the instantaneous maximum value of the impact force and significantly enhancing the impact resistance of the crane and the mobile umbrella-shaped spanning frame.

[0006] The present utility model realizes the above purpose through the following technical solutions:

[0007] A buffer energy absorption device for the load-bearing roller of a mobile spanning frame, comprising a buffer energy absorption device, a roller connection device, a pin, a load-bearing roller, a top load-bearing seat, and the upper cross beam of the main load-bearing truss. It is characterized in that: the buffer energy absorption device is installed on the top load-bearing seat and the upper cross beam of the main load-bearing truss of the mobile spanning frame, the buffer energy absorption devices are used in pairs, the two ends of the load-bearing roller are respectively inserted with the roller connection device, and the other end of the roller connection device is hinged to the buffer strut of the buffer energy absorption device through a pin.

[0008] The described buffer energy absorption device consists of an open nut, a split pin, a buffer spring, a buffer sleeve, a buffer strut, a cushion block, a spring locking disc, and a buffer movement space. The buffer sleeve has a structure with different inner diameters. The buffer strut is installed inside the smaller inner diameter of the buffer sleeve and passes through the larger inner diameter of the buffer sleeve. An open nut and a split pin are installed at the protruding end of the buffer strut. A cushion block is installed at the upper end of the larger inner diameter of the buffer sleeve, a buffer spring is installed inside the larger inner diameter of the buffer sleeve, and a spring locking disc is installed at the lower end of the larger inner diameter of the buffer sleeve. Under the action of the elastic force of the buffer spring, the buffer rod is pushed to the highest position by the buffer spring. There is a buffer movement space between the lower surface of the shoulder in the middle of the buffer strut and the upper surface of the top bearing seat of the spanning frame or the upper beam of the main bearing truss. When the buffer strut is subjected to a downward force, the buffer strut will compress the buffer spring and move downward, and at the same time, the buffer strut will be subjected to the reaction force of the compressed buffer spring.

[0009] The buffer sleeve, as the assembly base of the buffer energy absorption device, is welded at the position of the installation bearing roller on the top bearing seat of the spanning frame or the upper beam of the main bearing truss.

[0010] The cushion block is in step fit with the buffer strut, transferring the impact force borne by the buffer strut to the buffer spring, and the cushion block moves up and down together with the buffer spring.

[0011] The roller connection device consists of a rolling bearing, a roller support shaft, a spacer sleeve, and a snap ring. Rolling bearings are installed at both ends of the roller support shaft. A spacer sleeve is sleeved on the roller support shaft between the two rolling bearings, and the spacer sleeve abuts against the inner rings of the two rolling bearings. A snap ring is installed at the outer end of the roller support shaft.

[0012] The beneficial effects of the present utility model compared with the prior art are as follows:

[0013] The buffer energy absorption device for the load roller of the mobile spanning frame utilizes the impulse theorem of classical mechanics. When a wire breakage or wire running accident occurs during the stringing of the power line, the mobile umbrella-shaped spanning frame bears the impact force of the accident power conductor through the load roller group arranged at the top. Due to the buffer movement space existing in the buffer energy absorption devices installed at both ends of the load roller, the instantaneous peak value of the impact force can be reduced, and thus the instantaneous overturning moment transmitted to the mobile umbrella-shaped spanning frame and the crane also follows to decrease, thereby reducing the requirements for the load-bearing capacity of the mobile spanning frame and the crane. Description of the Drawings

[0014] Figure 1 It is a schematic structural diagram of a buffer energy absorption device for the load roller of a mobile spanning frame;

[0015] Figure 2 It is a front view structural diagram of the buffer energy absorption device installed on the top bearing seat;

[0016] Figure 3Schematic top view of the buffer energy absorption device installed on the top bearing seat;

[0017] Figure 4 Schematic diagram of the buffer energy absorption device installed on the upper crossbeam of the main bearing truss;

[0018] Figure 5 Schematic diagram of the buffer energy absorption device installed on the load-bearing roller of the mobile spanning frame;

[0019] Figure 6 Schematic diagram of the construction state of the buffer energy absorption device installed on the mobile spanning frame.

[0020] In the figure: 1. Buffer energy absorption device; 101. Split nut; 102. Split pin; 103. Buffer spring; 104. Buffer sleeve; 105. Buffer strut; 106. Cushion block; 107. Spring locking disc; 108. Buffer moving space; 2. Roller connection device; 201. Rolling bearing; 202. Roller support shaft; 203. Spacer sleeve; 204. Snap ring; 3. Plug pin; 4. Load-bearing roller; 5. Top bearing seat; 6. Upper crossbeam of the main bearing truss; 7. Crane; 8. Umbrella-shaped spanning frame; 9. New conductor; 10. Crossed conductor. Detailed implementation method

[0021] See the appendix Figures 1-6 The buffer energy absorption device for the load-bearing roller of the mobile spanning frame includes a buffer energy absorption device 1, a roller connection device 2, a plug pin 3, a load-bearing roller 4, a top bearing seat 5 and an upper crossbeam 6 of the main bearing truss. The buffer energy absorption device 1 serves as the mounting seat of the load-bearing roller 4 and is installed at locations such as the top bearing seat 5 of the mobile spanning frame and the upper crossbeam 6 of the main bearing truss for mounting the load-bearing roller 4. The buffer energy absorption devices 1 are used in pairs. At both ends of the load-bearing roller 4, roller connection devices 2 are respectively inserted. The other ends of the roller connection devices 2 are hinged to the buffer struts 105 of the buffer energy absorption device 1 through plug pins 3.

[0022] Furthermore, the buffer energy absorption device 1 is composed of an open nut 101, a split pin 102, a buffer spring 103, a buffer sleeve 104, a buffer strut 105, a cushion block 106, a spring locking disc 107 and a buffer movement space 108. The buffer sleeve 104 is welded as the assembly base of the buffer energy absorption device 1 at the position of the mounting bearing roller 4 on the top bearing seat 5 of the spanning frame or the upper cross beam 6 of the main bearing truss; the buffer sleeve 104 has a structure with different inner diameters. The buffer strut 105 is inserted into the small inner diameter of the buffer sleeve 104 and passes through the large inner diameter of the buffer sleeve 104. An open nut 101 and a split pin 102 are installed at the protruding end of the buffer strut 105; a cushion block 106 is installed at the upper end of the large inner diameter of the buffer sleeve 104, a buffer spring 103 is installed inside the large inner diameter of the buffer sleeve 104, and a spring locking disc 107 is installed at the lower end of the large inner diameter of the buffer sleeve 104; under the action of the elastic force of the buffer spring 103, the buffer rod 105 is pushed to the highest position by the buffer spring 103. There is a buffer movement space 108 between the lower surface of the shoulder in the middle of the buffer strut 105 and the upper surface of the top bearing seat 5 of the spanning frame or the upper cross beam 6 of the main bearing truss. When the buffer strut 105 is subjected to a downward force, the buffer strut 105 will compress the buffer spring 103 and move downward. At the same time, the buffer strut 105 will receive the reaction force of the compressed buffer spring 103.

[0023] Furthermore, the cushion block 106 is placed at the step of the top of the buffer spring and the buffer strut 105 to transfer the impact force borne by the buffer strut 105 to the buffer spring 103, and the cushion block 106 moves up and down together with the buffer spring 103.

[0024] Furthermore, the roller connection device 2 is composed of a rolling bearing 201, a roller support shaft 202, a spacer sleeve 203 and a snap ring 204. Rolling bearings 201 are installed at both ends of the roller support shaft 202. A spacer sleeve 203 is sleeved on the roller support shaft 202 between the two rolling bearings 201. The spacer sleeve 203 abuts against the inner rings of the two rolling bearings 201. A snap ring 204 is installed at the outer end of the roller support shaft 202 to prevent the rolling bearings 201 and the spacer sleeve 203 from falling off the support shaft 202; the two ends of the bearing roller 4 are respectively inserted with the roller connection device 2 to ensure that the bearing roller 4 can rotate flexibly; the other ends of the two roller connection devices 2 are respectively hinged to the buffer strut 105 of the buffer energy absorption device 1 through pins 3 to form a roller mechanism with flexible rotation and buffer energy absorption capabilities.

[0025] The working process of the buffer energy absorption device for the bearing roller of the mobile spanning frame is as follows:

[0026] During the construction process, when an accident occurs, the newly built conductor 9 suddenly breaks and then contacts the load-bearing drum 4. The load-bearing drum 4 compresses the buffer energy-absorbing devices 1 at both ends through the drum connection device 2 and the pin 3. Due to the existence of the buffer moving space 108, it takes a certain displacement and deceleration before the newly built conductor 9 and the buffer energy-absorbing device 1 come to a standstill, and the impact process ends. Due to the existence of the buffer moving space 108, the variable S of the movement displacement can be increased, so that the action time t of the force during the impact process is lengthened. According to the classical mechanics displacement-velocity-time formula , where S is the displacement change, V is the velocity change, and t is the movement time. When the velocity change V is constant, the larger the displacement change S, the longer the movement time t. According to the classical mechanics impulse theorem, , where P is the impulse change of the newly built conductor 9 contacting the load-bearing drum 4 in the accident, F is the instantaneous impact force of the newly built conductor 9 contacting the load-bearing drum 4, and t is the duration of the force acting on the newly built conductor 9 from contacting the load-bearing drum 4 to its standstill during the accident process. Since P is a fixed value and t is larger, the instantaneous impact force F is smaller. Because of the decrease in the instantaneous impact force F, the impact forces transmitted to the mobile umbrella-shaped spanning frame 8 and the crane 7 also decrease accordingly, thereby reducing the requirements for the load-bearing capacities of the mobile spanning frame 8 and the crane 7 and reducing the possibility of construction accidents

Claims

1. A buffer energy absorption device for a movable spanning frame load-bearing roller, comprising a buffer energy absorption device (1), a roller connection device (2), a pin (3), a load-bearing roller (4), a top load-bearing seat (5) and a main load-bearing truss upper cross beam (6), characterized in that: The buffer energy absorption device (1) is installed on the top bearing seat (5) of the mobile spanning frame and the upper cross beam (6) of the main bearing truss. The buffer energy absorption devices (1) are used in pairs. The two ends of the bearing roller (4) are respectively inserted with roller connection devices (2), and the other ends of the roller connection devices (2) are hinged to the buffer strut (105) of the buffer energy absorption device (1) through pins (3).

2. The buffer energy absorption device for the load-bearing drum of a mobile spanning frame according to claim 1, wherein: The buffer energy absorption device (1) consists of an open nut (101), an open pin (102), a buffer spring (103), a buffer sleeve (104), a buffer strut (105), a cushion block (106), a spring locking disc (107) and a buffer movement space (108). The buffer sleeve (104) has a structure with different inner diameters. The buffer strut (105) is installed in the small inner diameter of the buffer sleeve (104) and passes through the large inner diameter of the buffer sleeve (104). An open nut (101) and an open pin (102) are installed at the protruding end of the buffer strut (105). A cushion block (106) is installed at the upper end of the large inner diameter of the buffer sleeve (104), a buffer spring (103) is installed in the large inner diameter of the buffer sleeve (104), and a spring locking disc (107) is installed at the lower end of the large inner diameter of the buffer sleeve (104). Under the action of the elastic force of the buffer spring (103), the buffer strut (105) is pushed to the highest position by the buffer spring (103). There is a buffer movement space (108) between the lower surface of the shoulder in the middle of the buffer strut (105) and the upper surface of the top bearing seat (5) of the spanning frame or the upper cross beam (6) of the main bearing truss. When the buffer strut (105) is subjected to a downward force, the buffer strut (105) will compress the buffer spring (103) and move downward. At the same time, the buffer strut (105) will receive the reaction force of the compressed buffer spring (103).

3. The buffer energy absorption device for the load-bearing roller of the mobile spanning frame according to claim 2, characterized in that: The buffer sleeve (104) is welded to the position of the mounting bearing roller (4) on the top bearing seat (5) of the spanning frame or the upper cross beam (6) of the main bearing truss as the assembly base of the buffer energy absorption device (1).

4. A buffer energy absorption device for a mobile spanning frame bearing roller according to claim 2, characterized in that: The cushion block (106) is in step fit with the buffer strut (105) to transfer the impact force borne by the buffer strut (105) to the buffer spring (103), and the cushion block (106) moves up and down together with the buffer spring (103).

5. A buffer energy absorption device for a load-bearing roller of a mobile spanning frame according to claim 1, characterized in that: The roller connection device (2) consists of a rolling bearing (201), a roller support shaft (202), a spacer sleeve (203) and a snap ring (204). Rolling bearings (201) are installed at both ends of the roller support shaft (202). A spacer sleeve (203) is sleeved on the roller support shaft (202) between the two rolling bearings (201). The spacer sleeve (203) abuts against the inner rings of the two rolling bearings (201). A snap ring (204) is installed at the outer end of the roller support shaft (202).

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