Linkage lifting device with even linkage ratios

Abstract

The utility model provides an even linkage ratio linkage lifting device which comprises a lifting rod and a cable, the top of the lifting rod is fixedly provided with equipment, the lifting rod is provided with a support, the two ends of the support are connected with a first pulley assembly through connecting pipes, and the middle of the lifting rod is fixedly connected with a second pulley assembly through the support. The first pulley assembly is located under the second pulley assembly, one end of the cable is fixedly connected with the top end of the lifting rod through the fixing assembly and electrically connected with equipment, and the other end of the cable sequentially bypasses the first pulley assembly and the second pulley assembly and then is electrically connected with an external power source. The problem that in the prior art, in the using process of a lifting rod, a cable connected with equipment at the top end of the lifting rod is prone to being twisted in the take-up or pay-off process is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of lifting rods, in particular to a linkage lifting device with an even linkage ratio. Background Art

[0002] When using some equipment, it is necessary to raise the equipment (such as some monitoring equipment, etc.) to a certain height in the air to achieve the ideal use effect. When raising the equipment, it is generally achieved through a lifting rod. The lifting rod is generally composed of multiple tube sections. A power source is set inside the lifting rod to drive it to expand or retract. Since some equipment also requires external cables, the cables connected to the top equipment need to be raised and lowered. During the lifting process, it is necessary to avoid cable entanglement to prevent cable damage, power outages, and obstruction of telescopic rod extension and retraction. At present, the main winding methods in the industry are winding wheel winding and spring cable winding. The winding wheel is divided into two types: wire-carrying slip ring winding and wire-free slip ring winding. The cost of the winding wheel with wire-carrying slip ring is relatively high, usually thousands or even tens of thousands of yuan for one electric slip ring. When the take-up wheel without an electric slip ring is working, the take-up wheel rotates. In order to avoid the cable from being entangled, the cable on the take-up wheel and the cable on the ground need to be manually disconnected, and the connector must be manually plugged and unplugged, which cannot be realized automatically. In the spring cable take-up method, as the lifting rod continues to rise, the spring energy storage increases. When the lifting rod reaches the maximum height, the spring energy storage is the maximum. At this time, the torque generated by the spring causes a large pulling force on the top of the lifting rod through the cable. This pulling force increases the working load of the lifting rod and may damage the internal core wire of the cable. In addition, when the spring cable is stretched, its radial dimension will become smaller. In order to avoid interference with the lifting rod tube assembly during stretching, the existing spring cable usually increases the spring diameter or increases the number of turns, resulting in the need for a longer cable. The required cable length is generally more than twice the lifting stroke. Utility Model Content

[0003] In response to the deficiencies in the prior art, the utility model provides a linkage lifting device with an even linkage ratio, which solves the problem in the prior art that the cable connected to the equipment at the top of the lifting rod is easily tangled when winding or releasing the wires during the use of the lifting rod.

[0004] According to an embodiment of the present utility model, a linkage lifting device with an even linkage ratio includes a lifting rod and a cable. A device is fixedly installed on the top of the lifting rod. A bracket is provided on the lifting rod. Both ends of the bracket are connected to the first pulley assembly through a connecting pipe. The middle part of the lifting rod is also fixedly connected to the second pulley assembly through the bracket. The first pulley assembly is located directly below the second pulley assembly. One end of the cable is fixedly connected to the top of the lifting rod through a fixing assembly and is electrically connected to the device. The other end of the cable is electrically connected to an external power supply after passing through the first pulley assembly and the second pulley assembly in sequence.

[0005] Compared with the prior art, the present invention has the following beneficial effects: by installing the first pulley assembly and the second pulley assembly on one side of the lifting rod, the cable is wound around the first pulley assembly and the second pulley assembly, and the lifting rod is raised or lowered to pull the cable to release or reel in the cable, so that the cable is always wound around the first pulley assembly and the second pulley assembly, and will not interfere with external objects or get entangled with itself, thereby avoiding the phenomenon of the cable getting tangled when reeling in or releasing the cable during the lifting process of the lifting rod, ensuring the safety of workers when using the lifting rod and the service life of the cable.

[0006] Furthermore, the first pulley assembly and the second pulley assembly both include: a fixed plate, which is divided into two pieces, wherein the fixed plate of the first pulley assembly is fixedly connected to the connecting pipe, and the fixed plate of the second pulley assembly is fixedly connected to the corresponding bracket, and a number of support rollers are connected between the two fixed plates.

[0007] Furthermore, each roller is rotatably provided with a roller.

[0008] Furthermore, guard plates are provided on opposite sides of the two fixed plates, and each guard plate is provided with a through hole for the support roller to pass through.

[0009] Furthermore, a plurality of rollers are arranged on the fixed plate to form a channel for the cables to bypass.

[0010] Furthermore, the fixing assembly includes: a fixing frame, the fixing frame is fixedly sleeved on the top of the lifting rod, the side wall of the fixing frame is fixedly provided with a first clamping plate, the end of the first clamping plate away from the fixing frame is connected to the second clamping plate by bolts, and a groove for the plate line to pass through is provided between the first clamping plate and the second clamping plate.

[0011] Furthermore, through slots for the cables to pass through are provided on opposite sides of the first clamping plate and the second clamping plate, and a rubber pad is provided in each through slot. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is an axonometric view of an embodiment of the present invention.

[0013] Figure 2 It is a front view of an embodiment of the present utility model.

[0014] Figure 3 This is a schematic diagram of a first pulley assembly according to an embodiment of the present invention.

[0015] Figure 4 This is a schematic diagram of the fixing assembly structure of an embodiment of the present utility model.

[0016] In the above drawings: 1. lifting rod; 2. equipment; 3. bracket; 4. connecting pipe; 5. cable; 6. fixing plate; 7. support roller; 8. roller; 9. guard plate; 10. fixing frame; 11. first splint; 12. second splint; 13. rubber pad. DETAILED DESCRIPTION

[0017] The technical solution of the present invention is further described below with reference to the accompanying drawings and embodiments.

[0018] like Figure 1-2As shown, an embodiment of the present invention proposes an even-number linkage ratio linkage lifting device, including a lifting rod 1 and a cable 5. A device 2 is fixedly installed on the top of the lifting rod 1. A bracket 3 is provided on the lifting rod 1. Both ends of the bracket 3 are connected to the first pulley assembly through a connecting pipe 4. The middle part of the lifting rod 1 is also fixedly connected to the second pulley assembly through the bracket 3. The first pulley assembly is located directly below the second pulley assembly. One end of the cable 5 is fixedly connected to the top of the lifting rod 1 through a fixing assembly and is electrically connected to the device 2. The other end of the cable 5 is electrically connected to an external power supply after passing through the first pulley assembly and the second pulley assembly in sequence. In this embodiment, the lifting rod 1 has a total of five pipe sections. The connecting pipe 4 is a hard pipe, which can be a steel pipe. One end of the cable 5 is electrically connected to the device 2 at the top of the lifting rod 1 to facilitate the subsequent power supply to the device 2. The other end of the cable 5 is wound around the first pulley assembly and the second pulley assembly in sequence. After the winding is completed, the cable 5 is fixed to the pipe section at the bottom of the lifting rod 1 (the pipe section will not move), and is finally connected to an external power source so that the cable 5 can power the device 2. When the lifting rod 1 is expanded or retracted under the drive of the power source, assuming the linkage ratio (If the total number of pipe sections is m, the linkage ratio n=m-1. In this embodiment, the total number of pipe sections is 5 and the linkage ratio is 4.) When the distance of displacement of the lifting rod 1 with a value of N relative to the fully retracted state is N*H, the stroke of the rise of one of the pipe sections of the lifting rod 1 is H, and the stroke of the rise of the first pulley assembly is H. Since the number of layers of cable 5 wound on the first pulley assembly is N / 2, the length of the cable 5 pulled out by the top of the lifting rod 1 is N*H. That is, when the lifting rod 1 rises to any height, its total stroke is consistent with the length of the cable 5 pulled out by the top of the lifting rod 1, thus achieving synchronization. The wire is released step by step, and the same is true when the lifting rod 1 is lowered. As a result, when the lifting rod 1 is raised or lowered, the cable 5 that supplies power to the device 2 at the top of the lifting rod 1 rises or falls with the lifting rod 1, and the lifting rod 1 automatically retracts and releases the wire synchronously. Compared with the wire-retracting wheel wire-retracting method, this device does not require manual plugging and unplugging of connectors, and does not require the purchase of additional electric slip rings. The power for automatic wire retraction and release is driven by the raising or lowering of the lifting rod 1 itself, and no additional pulling force is generated on the top of the lifting rod 1. The force on the cable 5 is the weight of the cable 5 itself and the smaller first pulley assembly. , and the friction between the second pulley assembly, while the friction between the cable 5 and the first pulley assembly and the second pulley assembly is relatively small, generally less than 30N. When the spring cable is working, the downward pulling force generated on the top of the lifting rod 1 is the weight of the spring cable itself and the downward pulling elastic force of the spring on the top of the lifting rod. The elastic force has different values ​​in different application scenarios, with a minimum of more than 40N and a maximum of nearly 300N. The use of this device to generate a smaller downward pulling force on the top of the lifting rod 1 can effectively avoid damage to the internal core wire of the cable 5 due to a large pulling force while preventing the cable 5 from being entangled.The cable 5 used in the present invention is only longer than the actual working cable 5 by the cable 5 wound around the first pulley assembly and the second pulley assembly. The length used is generally less than 1.3 times the stroke of the lifting rod 1. The length of the cable 5 used in the spring cable is generally more than 2 times the stroke of the lifting rod 1. The length of the cable 5 used in the present invention is shorter than that used in the spring cable.

[0019] like Figure 1-3 As shown, further, the first pulley assembly and the second pulley assembly each include: a fixed plate 6, the fixed plate 6 being two pieces, wherein the fixed plate 6 of the first pulley assembly is fixedly connected to the connecting tube 4, and the fixed plate 6 of the second pulley assembly is fixedly connected to the corresponding bracket 3, and a plurality of support rollers 7 are connected between the two fixed plates 6. The first pulley assembly and the second pulley assembly have the same structure. Specifically, the cable 5 is wound around the support rollers 7 between the two fixed plates 6. In this embodiment, the end of the cable 5 away from the device 2 first passes around the support rollers 7 on the first pulley assembly, then passes around the support rollers 7 on the second pulley assembly, and then passes around the support rollers 7 of the first pulley assembly. Similarly, the number of layers of cable 5 passing around the first pulley assembly is 1 / 2 of the linkage ratio, that is, two layers are wound around the first pulley assembly, thereby achieving synchronous winding and synchronous payout, and avoiding the phenomenon of cable 5 being tangled. Preferably, in this embodiment, the two fixed plates 6 are connected by a connecting shaft.

[0020] like Figure 3 As shown, further, each roller 7 is rotatably provided with a roller 8. By rotatably sleeved on each roller 7, the cable 5 can be moved more smoothly during the process of winding or unwinding the cable 5, reducing the friction between the cable 5 and the roller 7 or the roller 8, thereby protecting the cable 5.

[0021] like Figure 3 As shown, further, guard plates 9 are provided on opposite sides of the two fixing plates 6, and each guard plate 9 has a through hole for the support roller 7 to pass through. Specifically, the guard plates 9 and the roller 8 are made of plastic, specifically polyethylene or polyvinyl chloride. The guard plates 9 protect the cable 5 and will not damage the cable 5 during friction with the cable 5.

[0022] like Figure 3 As shown, further, a plurality of support rollers 7 are arranged on the fixed plate 6 to form a channel for the cable 5 to pass through. In this embodiment, the support rollers 7 on one side of the fixed plate 6 are arranged to form a two-layer fan-shaped structure. The cable 5 can be wound around the fan-shaped channel formed by the multiple support rollers 7. On the one hand, this facilitates the winding of the cable 5, and on the other hand, it ensures smooth movement of the cable 5.

[0023] like Figure 4As shown, the fixing assembly further includes: a fixing frame 10, which is fixedly mounted on the top of the lifting rod 1. A first clamping plate 11 is fixedly mounted on the side wall of the fixing frame 10. The end of the first clamping plate 11 away from the fixing frame 10 is connected to a second clamping plate 12 by bolts. A groove for the cable to pass through is defined between the first clamping plate 11 and the second clamping plate 12. The first clamping plate 11 and the second clamping plate 12 cooperate to clamp and secure the end of the cable 5 near the device 2. On the one hand, this prevents the cable 5 from swinging excessively during the process of retracting and releasing the cable. On the other hand, when the lifting rod 1 moves upward, it applies an upward pulling force to the cable 5 to achieve the release of the cable.

[0024] like Figure 4 As shown, further, the first and second clamping plates 11, 12 are provided with through slots on opposite sides thereof for the passage of the cables 5, and each of the through slots is provided with a rubber pad 13. The through slots allow the cables 5 to pass through, and the cables 5 are clamped by the rubber pads 13 on the first and second clamping plates 11, 12. This prevents the first and second clamping plates 11, 12 from squeezing the cables 5 due to the thickness of the cables 5, thereby securing the cables 5 while protecting them.

[0025] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model and are not limiting. Although the utility model is described in detail with reference to the preferred embodiments, ordinary technicians in this field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.

Claims

1. A linkage lifting device with an even linkage ratio, characterized in that: include: A lifting rod (1), a device (2) is fixedly provided on the top of the lifting rod (1), a bracket (3) is provided on the lifting rod (1), both ends of the bracket (3) are connected to a first pulley assembly through a connecting pipe (4), and a middle portion of the lifting rod (1) is also fixedly connected to a second pulley assembly through the bracket (3), and the first pulley assembly is located directly below the second pulley assembly; A cable (5), one end of the cable (5) is fixedly connected to the top of the lifting rod (1) through a fixing assembly and is electrically connected to the device (2), and the other end of the cable (5) is electrically connected to an external power supply after passing through the first pulley assembly and the second pulley assembly in sequence.

2. The even-number linkage ratio linkage lifting device according to claim 1, characterized in that: The first pulley assembly and the second pulley assembly both include: a fixed plate (6), the fixed plate (6) is two pieces, wherein the fixed plate (6) of the first pulley assembly is fixedly connected to the connecting pipe (4), and the fixed plate (6) of the second pulley assembly is fixedly connected to the corresponding bracket (3), and a plurality of supporting rollers (7) are connected between the two fixed plates (6).

3. The even-number linkage ratio linkage lifting device according to claim 2, characterized in that: A roller (8) is rotatably provided on each roller (7).

4. The even-number linkage ratio linkage lifting device according to claim 2 or 3, characterized in that: The opposite sides of the two fixed plates (6) are provided with guard plates (9), and each guard plate (9) is provided with a through hole for the support roller (7) to pass through.

5. The even-number linkage ratio linkage lifting device according to claim 2, characterized in that: A plurality of support rollers (7) are arranged on the fixed plate (6) to form a channel for the cable (5) to pass around.

6. The even-number linkage ratio linkage lifting device according to claim 1, characterized in that: The fixing assembly comprises: a fixing frame (10), the fixing frame (10) is fixedly sleeved on the top of the lifting rod (1), a first clamping plate (11) is fixedly provided on the side wall of the fixing frame (10), an end of the first clamping plate (11) away from the fixing frame (10) is connected to a second clamping plate (12) by a bolt, and a groove for the plate line to pass through is provided between the first clamping plate (11) and the second clamping plate (12).

7. The even-number linkage ratio linkage lifting device according to claim 6, characterized in that: Through slots for the cables (5) to pass through are provided on opposite sides of the first clamping plate (11) and the second clamping plate (12), and a rubber pad (13) is provided in each through slot.

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