A cable drum brake device with a scissor jack structure

Abstract

The present invention discloses a cable drum brake device with a scissor jack structure. The cable drum brake device includes a bottom plate, an upper plate and an upper frame arranged in sequence from bottom to top; a plurality of scissor jacks are installed between the bottom plate and the upper plate; a plurality of spring buffer mechanisms are provided between the upper plate and the upper frame; an arc-shaped recessed portion whose shape is adapted to the edge of the cable drum is provided in the middle position of the top of the upper frame; a brake belt is installed on the top surface of the upper frame. The present invention adopts structures such as a scissor jack, a spring buffer mechanism, and a brake belt to achieve frictional contact between the cable drum brake device and the edge of the cable drum, thereby achieving braking of the cable drum. Compared with the manual braking method in the prior art, the cable drum brake device provided in the present invention has significantly improved safety, and the operation of the device is simple and convenient, and the braking effect is good.

Description

Technical Field

[0001] The invention belongs to the technical field of cable laying and conductor laying, and in particular relates to a cable drum braking device with a scissor-type jack structure. Background Art

[0002] High-voltage cable reels and overhead conductor reels of 35kV and above voltage levels are heavy and large in size, so they often require traction machines, capstans, conveyors and other power devices for traction and transportation during cable laying. Since the cables themselves have the characteristics of bending resistance and large inertia, the cable reels (high-voltage cable reels and overhead conductor reels, etc.) will experience uneven rotation speed, loose reels and wires, and cable dragging and friction when rotating, which will cause the cable outer sheath or wire to wear. In some cases, the cable needs to be repaired, and in some cases, the entire reel needs to be replaced, resulting in large economic and time costs.

[0003] In order to overcome this problem, manual braking is currently often used. That is, during the cable laying process, the two sides of the cable drum are manually adjusted using objects such as wooden sticks or steel pipes to manually adjust the braking force, thereby controlling the cable drum rotation speed and achieving braking. However, the manual braking method has the following problems: First, the safety factor is small, and the braking force during the braking process is uneven. When the braking force is too large, it is easy to cause the risk of wooden sticks or steel pipes breaking and slipping, causing personnel to become unstable and shake, and the cable drum rotation is out of control; second, the labor cost is high, and two people are required to operate the entire line laying process; third, the braking difficulty is high, and the braking operator needs to adjust the braking force at any time according to the traction and conveying speed to ensure the uniform rotation of the cable drum. It can be seen that there is an urgent need to propose a cable drum braking device to solve the above-mentioned technical problems existing in the prior art. Summary of the invention

[0004] The purpose of the present invention is to provide a cable drum brake device with a scissor jack structure, so as to utilize the principle of the scissor jack to achieve friction braking on the edge of the cable drum, with simple operation and good braking effect.

[0005] In order to achieve the above object, the present invention adopts the following technical scheme:

[0006] A cable drum brake device with a scissor jack structure, comprising:

[0007] The bottom plate, upper plate and upper frame are arranged in sequence from bottom to top; wherein:

[0008] M scissor jacks are installed between the bottom plate and the upper plate, where M is an integer greater than or equal to 2;

[0009] N spring buffer mechanisms are provided between the upper plate and the upper frame, where N is an integer greater than or equal to 4;

[0010] An arc-shaped recessed portion having a shape adapted to the edge of the cable drum is provided at the top middle position of the upper frame;

[0011] A brake band is mounted on the top surface of the upper frame.

[0012] Preferably, the bottom plate and the upper plate are square plates, and the upper frame is a square frame.

[0013] Preferably, there are two scissor jacks; the bottom of each scissor jack is mounted on the upper surface of the base plate by bolts, and the top of each scissor jack is mounted on the lower surface of the upper plate by bolts.

[0014] Preferably, the two scissor jacks are connected in the middle by a screw rod, and a wrench socket is provided at one end of the screw rod and a wrench is installed.

[0015] Preferably, the number of the spring buffer mechanisms is four;

[0016] Each spring buffer mechanism includes a limit bolt, a compression spring and a mounting nut;

[0017] Wherein, the top of the limit bolt is installed on the top of the upper frame;

[0018] A through hole is provided at the bottom of the upper frame;

[0019] The compression spring sleeve is placed on the limit bolt, and both the compression spring and the limit bolt pass downward through the through hole;

[0020] The upper plate is provided with mounting holes;

[0021] The lower end of the limit bolt passes through the mounting hole and is fastened by the mounting nut.

[0022] Preferably, a plurality of threaded steel bars arranged in the same direction are installed on the lower surface of the bottom plate.

[0023] Preferably, a limiting frame adapted to the side shape of the upper frame is installed on the upper surface of the upper plate, the upper frame is located inside the limiting frame, and can move up and down along the inner side of the limiting frame under the action of the spring buffer mechanism.

[0024] Preferably, the bottom plate, the upper plate and the upper frame are all made of steel plates.

[0025] Preferably, the brake band is made of asbestos material.

[0026] The present invention has the following advantages:

[0027] As described above, the present invention provides a cable drum brake device, which uses a scissor jack, a spring buffer mechanism, a brake belt and other structures to achieve frictional contact between the brake device and the edge of the cable drum, thereby achieving braking of the cable drum. Compared with the manual braking method in the prior art, the present invention has significantly improved safety, is simple and convenient to operate, and has a good braking effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a structural schematic diagram (front view) of the cable drum brake device in Example 1 of the present invention.

[0029] Figure 2 It is a structural schematic diagram (side view) of the cable drum brake device in Example 1 of the present invention.

[0030] Figure 3 This is a schematic diagram of the structure of the wrench in Example 1 of the present invention.

[0031] Figure 4 It is a structural schematic diagram (front view) of the upper frame in Example 1 of the present invention.

[0032] Figure 5 It is a structural schematic diagram (side view) of the upper frame in Example 1 of the present invention.

[0033] Figure 6 This is a diagram showing the use status of the cable drum brake device in Example 1 of the present invention.

[0034] Among them, 1-bottom plate, 2-upper plate, 3-upper frame, 4-scissor jack, 5-screw rod, 6-wrench socket, 7-wrench, 8-spring buffer mechanism, 9-limit bolt, 10-compression spring;

[0035] 11-mounting nut, 12-through hole, 13-mounting hole, 14-limiting frame, 15-arc-shaped recess, 16-brake band, 17-threaded steel bar, 18-cable drum, 19-disc, 20-brake device, 21-fixing plate, 22-fixing hole. DETAILED DESCRIPTION

[0036] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments:

[0037] Example 1

[0038] Combination Figure 1 and Figure 2 As shown, this embodiment describes a cable drum brake device with a scissor jack structure, which includes a bottom plate 1, an upper plate 2 and an upper frame 3 arranged in sequence from bottom to top.

[0039] The bottom plate 1, the upper plate 2 and the upper frame 3 are all made of steel plates to improve the structural strength of the braking device.

[0040] The bottom plate 1 and the upper plate 2 are preferably square plates, and the upper frame 3 is preferably a square frame.

[0041] A plurality of scissor jacks 4 are installed between the bottom plate 1 and the upper plate 2 , and the function of each scissor jack 4 is to control the rising and falling movements of the upper plate 2 , the upper frame 3 and other components.

[0042] Since the following brake belt 16 and other components are installed on the upper frame 3, when the upper frame 3 moves upward, it can be ensured that the brake belt 16 contacts the edge of the cable drum, thereby achieving friction braking of the cable drum with good braking effect.

[0043] The scissor jack 4 in this embodiment is a known structure, and its working principle is as follows:

[0044] The scissor jack is based on the geometric principle that if the two sides of an isosceles triangle remain unchanged and the base is shortened, the height line will be raised. It uses a screw and a nut to adjust the bases of the upper and lower isosceles triangles to lift and lower the height.

[0045] Based on the above working principle, the scissor jack 4 (the screw rod and the nut cooperate, and the rising and falling distances are easy to control) is applied to the braking device in this embodiment, which can accurately control the braking effect on the edge of the cable drum.

[0046] In this embodiment, the number of the scissor jacks 4 is preferably two, and the two scissor jacks 4 can be symmetrically arranged between the bottom plate 1 and the upper plate 2 to ensure uniform lifting of components such as the upper plate 2 and the upper frame 3.

[0047] Take one of the scissor jacks 4 as an example for explanation:

[0048] The bottom of each scissor jack 4 is mounted on the upper surface of the base plate 1 by bolts, and the top of each scissor jack 4 is mounted on the lower surface of the upper plate 2 by bolts.

[0049] In addition, in order to achieve the synchronization of the actions of the two scissor jacks 4, the following designs are also carried out:

[0050] The middle parts of the two scissor jacks 4 are connected by a screw rod 5;

[0051] A spanner socket 6 is provided at one end of the screw rod 5, and a spanner 7 is installed in the spanner socket 6. Figure 3 shown.

[0052] By inserting the spanner 7 into the spanner socket 6 and rotating the spanner 7 , the screw rod 5 can be matched with the nut on each scissor jack 4 , thereby achieving synchronous lifting or lowering of the two scissor jacks 4 .

[0053] The above design well ensures the stability and reliability of the action of the braking device in this embodiment.

[0054] Of course, in this embodiment, the number of the scissor jacks 4 may be greater than two to ensure the lifting effect of the jacks.

[0055] like Figure 3 As shown, the wrench 7 has nothing special about it, and any conventional wrench in the prior art can be used.

[0056] Four spring buffer mechanisms 8 are provided between the upper plate 2 and the upper frame 3 .

[0057] Each spring buffer mechanism 8 is located at a corresponding corner position of the upper plate 2 and the upper frame 3 .

[0058] The purpose of providing the spring buffer mechanism 8 is to ensure good contact between the braking device in this embodiment and the edge of the cable drum when the edge of the cable drum is uneven, thereby ensuring the braking effect.

[0059] The automatic expansion and contraction of the spring ensures that the brake belt 16 described below is always in friction with the edge of the cable drum, and ensures that the friction force can prevent the cable drum from unraveling; when traction stops, the friction force can quickly brake the cable drum.

[0060] Take one of the spring buffer mechanisms 8 as an example for explanation:

[0061] like Figure 4 and Figure 5 As shown, the spring buffer mechanism 8 includes a limiting bolt 9, a compression spring 10 and a mounting nut 11.

[0062] The top of the limiting bolt 9 is installed (welded) on the top (lower surface) of the upper frame 3 .

[0063] A through hole 12 is provided at the bottom of the upper frame 3 .

[0064] The compression spring 10 is sleeved on the limiting bolt 9 , and both the compression spring 10 and the limiting bolt 9 pass downward through the through hole 12 .

[0065] The bottom of the compression spring 10 presses downward on the upper surface of the upper plate 2 (in a compressed state). Figure 1 shown.

[0066] The upper plate 2 is provided with mounting holes 13, such as Figure 1 shown.

[0067] The lower end of the limiting bolt 9 passes through the mounting hole 13 and is fastened by the mounting nut 11 .

[0068] The above-mentioned design of the spring buffer mechanism 8 can ensure that the upper frame 3 can slide up and down relative to the upper plate 2 .

[0069] Of course, the number of the spring buffer mechanisms 8 is not limited to the above four, and can also be more, such as six, eight, etc., as long as the spring buffer mechanisms 8 are arranged evenly and symmetrically.

[0070] In addition, in order to ensure the directionality of the up and down movement of the upper frame 3 , a limit frame 14 may be installed on the top of the upper plate 2 . The limit frame 14 has a shape that is adapted to the side of the upper frame 3 .

[0071] For example, the side of the upper frame 3 in this embodiment is square, so the limiting frame 14 is also square. Of course, the side of the upper frame 3 and the limiting frame 14 are not limited to the above square, which will not be repeated here.

[0072] The limiting frame 14 is preferably made of a steel plate, which can be mounted on the upper frame 3 by welding. The upper frame 3 is located inside the limiting frame 14, and moves up and down along the inner side of the limiting frame 14 under the action of the spring buffer mechanism 8.

[0073] like Figure 1 As shown, an arc-shaped recess 15 having a shape adapted to the edge of the cable drum is provided at the middle position of the top of the upper frame 3 .

[0074] The width of the arc-shaped recess 15 should be greater than the edge width of the cable drum. In addition, the curvature design of the arc-shaped recess 15 should ensure that the braking device (arc-shaped recess 15) in this embodiment has as large a contact area as possible with the edge of the cable drum.

[0075] In addition, a brake band 16, such as an asbestos brake band, is installed on the top surface of the upper frame 3. The asbestos brake band is closely attached to the top surface of the upper frame and can be bonded with an adhesive to ensure the durability of the brake device in this embodiment.

[0076] Of course, in order to ensure the stability of the braking device in the embodiment of the present invention, a plurality of threaded steel bars 17 are installed (for example, welded) on the lower surface of the bottom plate 1, and each threaded steel bar 17 is arranged in parallel.

[0077] The arrangement direction of each threaded steel bar 17 is consistent with (parallel to) the axial direction of the cable drum 18. Figure 6 The arrangement of the threaded steel bars 17 prevents the brake device in this embodiment from sliding during use.

[0078] In order to further increase the stability of the cable drum brake device when in use, a plurality of fixing plates, such as a fixing plate 21 , may be welded on the bottom plate 1 , and each fixing plate 21 is provided with a fixing hole 22 .

[0079] After the cable drum brake device is placed in place, a fixing pin (not shown) is passed through each fixing hole 22 and inserted downward into the ground, which can effectively prevent the cable drum brake device from sliding during use.

[0080] The number of the fixing plates 21 is, for example, four, that is, one fixing plate 21 is welded at each corner of the bottom plate 1. The material of each fixing plate 21 is the same as that of the bottom plate 1, that is, they are all made of steel plates.

[0081] The general use process of the cable drum brake device in this embodiment 1 is as follows:

[0082] like Figure 6 As shown, a brake device 20 in this embodiment 1 is placed under the edge of each disc 19 of the cable drum 18, and the arrangement direction of the threaded steel bar 17 is consistent with the axial direction of the cable drum 18 to ensure that the brake device does not slide.

[0083] In addition, due to the design of the arc-shaped recess 15, the contact between the braking device and the edge of the disk 19 is well ensured.

[0084] During the cable conveying process, the height of the upper plate 2 and the upper frame 3 is adjusted by the scissor jack 4 so that the brake belt 16 has good contact with the edge of the cable drum and generates a certain friction force to achieve braking of the cable drum 18.

[0085] Since the scissor jack 4 is adjusted in a threaded manner, the braking force control of the braking device is more uniform and accurate.

[0086] The braking device 20 in this embodiment 1 satisfies the requirements of cable laying and overhead line laying well.

[0087] Example 2

[0088] Except for the following technical features that are different from the above-mentioned embodiment 1, the remaining technical features of this embodiment 2 can refer to those of embodiment 1.

[0089] In this embodiment 2, the adjustment method of the scissor jack is changed, that is, the manually adjusted scissor jack 4 is replaced by an electric scissor jack, thereby replacing the screwing method of the wrench 7 with a DC motor and gear drive method.

[0090] Among them, the electric scissor jack is a known structure, and its structure will not be described in detail here.

[0091] In order to facilitate the lifting and lowering of the scissor jack, the DC motor is a forward and reverse motor.

[0092] The working principle of the electric scissor jack is roughly the same as that of the manual scissor jack, that is, it is driven by a DC motor and drives the gear to rotate, thereby driving the screw rod 5 to rotate, realizing the rising and falling movement of the scissor jack.

[0093] Since the cable drum brake device in the second embodiment is equipped with an electric scissor jack, it can also realize automatic adjustment of the braking force when the cable drum is conveying the cable, and has the advantages of high degree of automation.

[0094] In addition, a vertically placed sensor bracket (not shown) is welded on the bottom plate 1. A photoelectric speed sensor is installed above the sensor bracket, and the installation height of the photoelectric speed sensor is equivalent to the lower height of the disc 19.

[0095] The rotation speed of the cable drum 18 can be detected by a photoelectric rotation speed sensor, thereby detecting the conveying speed of the cable.

[0096] In order to realize the detection of the photoelectric speed sensor, the disk 19 needs to be designed, for example, a plurality of holes are evenly opened on a certain circumference of the disk 19, and the detection is performed using the principle of the direct photoelectric speed sensor.

[0097] In addition, the cable drum brake device in this embodiment also includes a controller, which adopts a single chip microcomputer or a PLC controller.

[0098] The controller is connected to the traction machine, the photoelectric speed sensor and the DC motor of the electric scissor jack through cables. The automatic braking process of the cable drum brake device in this embodiment 2 is:

[0099] Before starting the traction machine, the controller first controls the electric scissor jack to realize the lifting movement of the upper frame 3 and the brake belt 16, so that the brake belt 16 contacts the edge of the disc 19. At this time, the brake device provides a certain braking force to the cable drum.

[0100] Turn on the traction machine, the cable drum starts to transport the cable, and at the same time, the photoelectric speed sensor works.

[0101] If the photoelectric speed sensor detects that the speed of the cable drum is too fast (for example, the number of revolutions is higher than the maximum set threshold within the set time), the controller sends a signal to the DC motor, the DC motor rotates forward, and controls the electric scissor jack to further lift the upper frame 3 and the brake belt 16, thereby increasing the friction force provided by the brake device 20 to the cable drum;

[0102] If the photoelectric speed sensor detects that the rotation speed of the cable drum is too slow (for example, it is lower than the minimum set threshold number of revolutions within the set time), the controller sends a signal to the DC motor, and the DC motor rotates in the opposite direction, thereby controlling the electric scissor jack to descend, and the upper frame 3 and the brake belt 16 move downward, thereby reducing the friction force provided by the brake device 20 to the cable drum.

[0103] When the traction speed of the traction machine needs to be changed (for example, increased or decreased) during the cable release process, the photoelectric rotation speed sensor re-detects the rotation speed of the cable drum and makes the above response in time when the rotation speed is too fast or too slow.

[0104] During the smooth transportation of the cable, the problem of poor contact between the edge of the disc 19 and the brake device 20 caused by the uneven edge of the disc 19 can be adaptively adjusted by the spring buffer mechanism 8.

[0105] After the cable is released, the traction machine and other equipment are turned off. Due to the presence of the braking device 20 in this embodiment, the cable drum 18 can be automatically decelerated and completely braked, and no manual braking is required during the entire process.

[0106] This embodiment 2 realizes the automated braking process of the cable drum brake device, has good braking effect and high automation, and this embodiment 2 also better ensures the dynamic balance between the traction speed and the friction braking effect, thereby ensuring the cable release effect.

[0107] Of course, the above description is only a preferred embodiment of the present invention, and the present invention is not limited to the above embodiments. It should be noted that all equivalent substitutions and obvious deformation forms made by any technician familiar with the field under the guidance of this specification fall within the essential scope of this specification and should be protected by the present invention.

Claims

1. A cable drum brake device with a scissor jack structure, It is characterized in that It includes a bottom plate, an upper plate and an upper frame arranged in sequence from bottom to top; wherein: M scissor jacks are installed between the bottom plate and the upper plate, where M is an integer greater than or equal to 2; N spring buffer mechanisms are provided between the upper plate and the upper frame, where N is an integer greater than or equal to 4; An arc-shaped recessed portion having a shape adapted to the edge of the cable drum is provided at the top middle position of the upper frame; A brake band is mounted on the top surface of the upper frame; There are at least two scissor jacks; the bottom of each scissor jack is mounted on the upper surface of the bottom plate by bolts, and the top of each scissor jack is mounted on the lower surface of the upper plate by bolts; The middle parts of the scissor jacks are connected by a screw rod, and a wrench socket is provided at one end of the screw rod and a wrench is installed; Each spring buffer mechanism includes a limit bolt, a compression spring and a mounting nut; Wherein, the top of the limit bolt is installed on the top of the upper frame; A through hole is provided at the bottom of the upper frame; The compression spring sleeve is placed on the limit bolt, and both the compression spring and the limit bolt pass downward through the through hole; The upper plate is provided with mounting holes; The lower end of the limiting bolt passes through the mounting hole and is fastened by the mounting nut; A limiting frame adapted to the side shape of the upper frame is installed on the upper surface of the upper plate. The upper frame is located inside the limiting frame and can move up and down along the inner side of the limiting frame under the action of the spring buffer mechanism.

2. The cable drum brake device according to claim 1, It is characterized in that The bottom plate and the upper plate are both square plates, and the upper frame is a square frame.

3. The cable drum brake device according to claim 1, It is characterized in that A plurality of threaded steel bars arranged in the same direction are installed on the lower surface of the bottom plate.

4. The cable drum brake device according to claim 1, 2 or 3, It is characterized in that The bottom plate, the upper plate and the upper frame are all made of steel plates.

5. The cable drum brake device according to claim 1, 2 or 3, It is characterized in that The brake band is made of asbestos material.

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