Front-end cable pulling device

Abstract

A front-end cable pulling device is characterized in that the front-end cable pulling device is composed of a power system, a controller, a cable pulling device, an encoder A and an encoder B. The power system and the cable pulling device are in controllable connection, the connection state of the power system and the cable pulling device is determined by the controller, a cable penetrates through the surfaces of signal induction wheels of the encoder A and the encoder B respectively, the encoder A is arranged in front of the encoder B, and a loosening distance F is set between the encoder A and the encoder B; the loosening distance refers to the difference between the actual length of a cable between the encoder A and the encoder B and the linear distance between the encoder A and the encoder B. The controller controls the connection state of the power system and the wire puller according to displacement difference information given by the encoder A and the encoder B. When the displacement difference between the encoder A and the encoder B is within the loosening distance 0-F range, the power system is kept connected with the wire puller, and when the displacement difference between the encoder A and the encoder B is within the loosening distance 0-F range, the power system is connected with the wire puller. And when the displacement difference between the encoder A and the encoder B is zero, the power system is disconnected from the wire puller. According to the utility model, the two displacement encoders are used and have a loose distance, so that the frequent change of the working state of the wire puller is avoided.

Description

Technical Field

[0001] The utility model belongs to a cable pulling device, especially a front-end cable puller. Background Art

[0002] The applicant has long been committed to the research of cable wiring equipment and has applied for a Chinese patent application No. 202022695649.3, named Intelligent Cable Puller and other related patents. It is found that the cable puller has the following problems in the use process: at the very front end of the cable, it is dragged forward manually. Due to the limitations of distance and manpower, a power cable puller is needed to assist so that the wiring distance of the cable can meet the design requirements. The manual walking and dragging is intermittent. Especially in the wild, the uneven speed of manual cable pulling is more obvious. Since there is only one speed sensor in the intelligent cable puller, only the moving speed of the cable can be used to control the clutch, thereby controlling the rotation speed of the transmission and the cable puller. The frequent pauses of manual walking and dragging make the clutch disconnect and close frequently, and drive the working state (on, off) of the cable puller to change frequently, which affects the service life. Summary of the Invention

[0003] The purpose of the utility model is to overcome the disadvantages that there is only one speed sensor in the prior art, and only the moving speed of the cable can be used to control the working state of the clutch and the cable puller, resulting in frequent changes in the working state and short service life. The utility model provides a front-end cable puller that can reduce the number of changes in the working state of the clutch and the cable puller and effectively extend the service life.

[0004] The technical solution adopted by the utility model is a front-end cable puller, which is characterized in that it is composed of a power system, a controller, a cable puller, encoder A, and encoder B. The power system and the cable puller are controllably connected, and the connection state is determined by the controller. The cable passes through the signal induction wheels of encoder A and encoder B respectively. Taking the forward direction of the cable as the reference, encoder A is in the front and encoder B is in the back. The signals measured by encoder A and encoder B are the moving distance of the cable. There is a slack distance F between the cables of encoder A and encoder B, and F is greater than zero. The slack distance refers to the difference between the actual length of the cable between encoder A and encoder B and the straight-line distance between encoder A and encoder B. The controller controls the connection state of the power system and the cable puller based on the displacement difference information given by encoder A and encoder B. When the displacement difference between encoder A and encoder B is within the range of slack distance 0 - F, the power system and the cable puller remain connected. When the displacement difference between encoder A and encoder B is zero, the power system and the cable puller are disconnected.

[0005] The present utility model changes the drawback of only one speed sensor existing currently. Two displacement encoders are used, and there is a slack spacing F between the two cables, that is, it is not in a taut state. The working state of the cable puller is controlled by the displacement difference of the cables between the front and rear encoders, and the slack spacing is used to buffer the short pause of the person walking in front of encoder A, avoiding frequent changes in the working state (start and stop) of the cable puller. When the displacement difference between encoder A and encoder B is zero, that is, when the slack spacing between the two returns to F, the power system is disconnected from the cable puller. At the same time, since the cable is not in a taut state, the internal stress of the cable in the forward direction caused by the thrust of the cable puller on the cable located between encoder A and encoder B is eliminated. That is, the moving force of the cable in encoder A only comes from the manpower in the front end, and the cable puller is only used to pull the cable at the rear end to prevent the person in the front from stopping, but the cable puller at the rear end does not stop pushing the cable forward.

[0006] Further design: F is 0.5 - 5 meters. If F is too long, it is easy to cause the cable to bend and knot.

[0007] There are two boxes, a control box and a power box. The control box contains a controller and encoder A, and the power box contains a power system, a cable puller, and encoder B. The distance between the control box and the power box should be greater than H.

[0008] The present utility model installs the controller and encoder A, and the power and encoder B in two different boxes respectively, so that the components in the controller are not affected by the vibration and heat dissipation of the power, and at the same time, a slack spacing can be left between encoder A and encoder B, and the overall device is ensured to be compact. The reason why the distance between the control box and the power box should be greater than H is that when the speed at the front end of encoder A is too fast, the cable between encoder A and encoder B is tightened. After the fault is eliminated, when the speed at the front end of encoder A slows down, the cable between encoder A and encoder B sags naturally under the action of gravity, so that the internal stress of the cable in the forward direction caused by the thrust of the cable puller on the cable at the rear end of encoder A is eliminated, thus ensuring that the movement of the cable at the front end of encoder A is only controlled by manpower.

[0009] Currently, H is 3 - 6 meters.

[0010] For a cable with a diameter of 1 cm, H is 4 - 6 meters.

[0011] The length of H is related to the diameter and rigidity of the cable. When there is no external force acting on the cable between the control box and the power box, the cable remains in a natural sag and presents a sag arc. The larger the diameter and the stronger the rigidity, the longer H is.

[0012] The described power system consists of an internal combustion engine, a speed reducer, and a clutch. The speed reducer is used to reduce the rotational speed of the internal combustion engine to match the walking speed at the front end. The power system is connected to a cable puller, which means one end of the clutch is connected to the internal combustion engine, and the other end is connected to the cable puller through the speed reducer. When the clutch is connected, the cable puller works; when the clutch is disengaged, the cable puller stops. The controller controls the two states of disconnection or connection of the clutch, thereby realizing the working state of the cable puller determined by the controller. Encoder B is fixed at the cable outlet of the power box. Using an internal combustion engine as the power device, fuel is easy to carry, and the working time can theoretically be infinite. The power system is an improvement on the existing intelligent cable puller power system, with the addition of Encoder B.

[0013] The described power system is a servo motor and a battery. The servo motor is directly or connected to the cable puller through a speed reducer. The speed reducer is only used to match the speed of the cable puller with the walking speed of a person. The built-in encoder C of the servo motor replaces Encoder B. The controller calculates the length of the cable sent out by Encoder C based on the rotation angle of Encoder C and controls the working state of the servo motor. Using a servo motor as the power system, the overall structure is relatively simple. Using a battery as the power source, due to the limitation of the battery capacity, the battery needs to be replaced during operation.

[0014] The advantages of the present utility model are that two displacement encoders are used, and there is a slack distance between the two cables, that is, they are not in a taut state. The working state of the clutch is controlled by using the cable displacement difference between the front and rear encoders, and the slack distance is used to buffer the short pause of the person walking in front of Encoder A, overcoming the defect caused by the non-uniform walking speed of the person in front when using a speed sensor, thereby reducing the working frequency of the clutch. At the same time, it also avoids the frequent change of the working state (on, off) of the cable puller. At the same time, since the cable between Encoder A and Encoder B is not in a taut state, the working process of the cable puller is smoother, reducing faults and extending the service life. During the installation process, as long as the actual slack distance after installation is greater than the set value, the installation process is convenient. The internal stress of the cable caused by the thrust of the cable puller is eliminated, that is, the moving force of the cable in Encoder A only comes from the human force at the front end, and the cable puller is only used to pull the cable at the rear end. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a schematic structural diagram of Embodiment 1 of the present utility model

[0016] Figure 2 is a schematic structural diagram of Embodiment 2 of the present utility model

[0017] Wherein: 1 control box, 2 controller, 3 power box, 4 cable puller, 6 pressure wheel, 7 Encoder A, 8 internal combustion engine, 9 Encoder B, 10 cable, 11 servo motor, 12 battery. DETAILED DESCRIPTION OF THE INVENTION

[0018] The present utility model will be described in detail below in conjunction with the views, so that those skilled in the art can better understand the present utility model. In the description of the present utility model, unless otherwise specified, the meaning of "a plurality of" is two or more; the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model. In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "coupled" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection, a direct connection, or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0019] Embodiment 1, as Figure 1 shown, a front-end cable puller powered by an internal combustion engine, which consists of a control box 1 and a power box 3. A controller 2, a battery, and an encoder A 7 are installed in the control box, and the battery is used to supply power to the controller. A power system, a cable puller, and an encoder B are installed in the power box 3. The power system consists of an internal combustion engine 8, a reducer, and a clutch 4. The reducer is used to reduce the speed of the internal combustion engine to match the walking speed of the front end. The internal combustion engine is connected to the clutch by a belt, the clutch is connected to the reducer by a belt, and the reducer is connected to the cable puller by a chain. The encoder consists of a signal induction wheel, an encoder body (purchased part), and a pressure wheel 6. Generally, the signal induction wheel is below the pressure wheel 6, and the cable 10 passes through the middle of the two. Under the action of the pressure wheel 6, the movement of the cable drives the signal induction wheel to rotate, and the shaft of the encoder body also rotates, realizing displacement measurement. A slack distance F is set for the cable between encoder A and encoder B, and F is greater than zero. The slack distance refers to the difference between the actual length of the cable between encoder A and encoder B and the straight-line distance between encoder A and encoder B. The cable from encoder A to the inlet in the control box is straight, so the slack distance is equal to the difference between the actual length of the cable between the two boxes and the distance between the two boxes. When the displacement difference between encoder A and encoder B is within the range of the slack distance 0 - F, the power system is connected to the cable puller. When the displacement difference between encoder A and encoder B is zero, the power system is disconnected from the cable puller.

[0020] The cable between the control box and the power box should ensure that the cable sags naturally and bends downward when not stretched. Generally, the distance is set greater than H. The length of H is related to the rigidity of the cable. The greater the rigidity, the longer H. The maximum tension of the connector should be less than the weight of the H-length cable. Generally, for a cable with a diameter of 1 cm, H should be greater than 3 meters. In this example, 4-6 meters are selected. F is 0.5-5 meters. If F is too long, it is easy to cause the cable to bend and knot. The length of the cable between the two boxes is H+F, and F is greater than zero, such as 4+2. In actual applications, the length of the cable between the two boxes only needs to be no less than 6 meters.

[0021] Currently, the connection between the controller and all controlled devices is a wired connection.

[0022] Using an internal combustion engine as a power device, the fuel is easy to carry and the working time can be infinitely long in theory. The remaining undescribed parts are the same as the prior art.

[0023] Embodiment 2, as Figure 2 As shown, a front-end cable puller powered by an electric motor is composed of a control box 1 and a power box 3. The control box is equipped with a controller 2, a battery, and an encoder A7. The battery is used to power the controller. The power box 3 is equipped with a power system and a cable puller. The power system is a servo motor 11 and a battery 12. The servo motor is directly or through a reducer connected to the cable puller. The servo motor is connected to the cable puller through a chain. The reducer is used only to match the speed of the cable puller with the walking speed of a person. The encoder C of the servo motor replaces the encoder B. The controller calculates the length of the cable sent by the encoder C according to the rotation angle of the encoder C. The controller controls the working state of the servo motor. Since the servo motor is connected to the cable puller through a chain, when the servo motor stops working, the cable puller also stops working. Similarly, when the displacement difference between the cable displacement on the encoder A and the cable displacement of the encoder C is within the range of 0-F, the servo motor remains in the working state. When the displacement difference between the cable displacement between the encoder A and the encoder C is zero, the servo motor stops working. The servo motor is used as the power system, the overall structure is relatively simple, and the battery is used as the power. Due to the limitation of the battery capacity, the battery needs to be replaced during operation. The remaining parts not described are the same as those in Example 1.

Claims

1. A front end cable puller, characterized in that: It consists of a power system, a controller, a wire puller, an encoder A and an encoder B. The power system and the wire puller are controllably connected, and their connection status is determined by the controller. The cable passes through the signal sensing wheel surfaces of encoder A and encoder B respectively, with encoder A in front and encoder B behind, based on the forward direction of the cable. The signals measured by encoder A and encoder B are the moving distances of the cables. A slack spacing F is set for the cables between encoder A and encoder B, and F is greater than zero. The controller controls the connection status of the power system and the wire puller with the displacement difference information given by encoder A and encoder B. When the displacement difference between encoder A and encoder B is within the range of the slack spacing 0-F, the power system remains connected to the wire puller. When the displacement difference between encoder A and encoder B is zero, the power system is disconnected from the wire puller.

2. A front end cable puller according to claim 1, characterized in that: F is 0.5-5 meters.

3. A front end cable puller according to claim 1, characterized in that: There are two boxes, a control box and a power box. The control box is equipped with a controller and encoder A, and the power box is equipped with a power system, a wire puller, and encoder B. The distance between the control box and the power box should be greater than H.

4. A front end cable puller according to claim 3, characterized in that: H is 3-6 meters.

5. A front end cable puller according to claim 4, characterized in that: For a cable with a diameter of 1 cm, H is 4-6 meters.

6. A front end cable puller according to claim 3, characterized in that: The length of H is related to the diameter and rigidity of the cable. When there is no external force acting on the cable between the control box and the power box, the cable remains naturally drooping and presents a drooping arc.

7. A front end cable puller according to claim 1, characterized in that: The power system is an internal combustion engine, a reducer, and a clutch. The reducer is used to reduce the speed of the internal combustion engine to match the pedestrian speed at the front end. The power system is connected to the cable puller, which means that one end of the clutch is connected to the internal combustion engine, and the other end is connected to the cable puller through the reducer. The cable puller works when the clutch is connected and stops when the clutch is disconnected. The controller controls the clutch to be disconnected or connected, so that the working state of the cable puller is determined by the controller. Encoder B is fixed to the cable outlet of the power box.

8. A front end cable puller according to claim 1, characterized in that: The power system is a servo motor and a battery. The servo motor is connected to the cable puller directly or through a reducer. The reducer is used only to match the speed of the cable puller with the walking speed of a person. The encoder C provided by the servo motor replaces the encoder B. The controller calculates the length of the cable sent by the encoder C based on the rotation angle of the encoder C. The controller controls the working state of the servo motor.

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