Automatic follow-up cable reel for electric excavator

Abstract

The application provides an automatic follow-up cable winding and unwinding vehicle for electric excavators, which comprises a vehicle body, a support frame for providing support for a winding drum is fixedly connected inside the vehicle body, and a cable is wound on the surface of the winding drum; a driving mechanism for driving the winding drum and a wire arranging assembly to move is installed inside the vehicle body, a helical guide groove is symmetrically arranged on the surface of a reciprocating wire rod, a turning groove is arranged at both ends of the reciprocating wire rod, and the inclination angle of the guide groove on the surface of the reciprocating wire rod is greater than the inclination angle of the turning groove on the surface of the reciprocating wire rod; an overwire frame for avoiding the cable from being stuck is installed at the top end of a mounting seat, a plurality of first rollers are rotatably connected between two connecting plates, and the first rollers are distributed in an "eight" shape on the surface of the connecting plate. The automatic follow-up cable winding and unwinding vehicle for electric excavators has the advantages that the cable is uniformly wound on the surface of the winding drum, and the cable is prevented from being stuck during turning.

Description

Technical Field

[0001] This invention relates to the field of electric engineering machinery and equipment technology, and in particular to an automatic following cable reeling and laying vehicle for electric excavators. Background Technology

[0002] Electric excavators are a type of excavation equipment widely used in engineering construction, road repair, mining and other fields. Compared with traditional internal combustion engine excavators, electric excavators have advantages such as low noise, environmental friendliness, energy saving and low operating costs.

[0003] During the operation of an electric excavator, a cable trolley connects the excavator to the power grid. To ensure the cable is evenly wound layer by layer onto the drum surface, a cable guide is installed at the rear of the drum. A reciprocating screw drives the cable guide frame to reciprocate, ensuring the cable is evenly wound onto the drum surface. When the cable guide reaches the end of the bidirectional screw and winds the last turn of cable in one layer, it changes direction and winds the first turn of the next layer. However, because the cable guide typically moves at a constant speed (when the drum rotates at a constant speed), it spends too little time at the drum edge, resulting in uneven cable winding. During the excavator's turning, the cable trolley follows the turn according to signals. If the cable trolley's turning angle is too large, or the angle between the cable and the cable guide frame is too large, the cable may get stuck at the cable guide frame's inlet, affecting cable operation and potentially causing cable damage.

[0004] Therefore, it is necessary to provide a new type of electric excavator with an automatic following cable reel-in / reel-out vehicle to solve the above problems. Summary of the Invention

[0005] The technical problem solved by the present invention is to provide an automatic following cable reeling and unwinding vehicle for electric excavators that allows the cable to be evenly wound on the surface of the drum and avoids the cable from turning and getting stuck.

[0006] To solve the above-mentioned technical problems, the present invention provides an automatic following cable reeling and unloading trolley for electric excavators, comprising: a vehicle body, an electric track mounted on the bottom end of the vehicle body, a support frame fixedly connected inside the vehicle body for supporting the drum, and a cable wound on the surface of the drum; a drive mechanism for driving the drum and cable guide assembly to move is installed inside the vehicle body, the cable guide assembly includes a bearing mounting seat, one end of the support frame is symmetrically fixedly connected to the bearing mounting seat, the bearing mounting seat is rotatably connected to a reciprocating lead screw, the surface of the reciprocating lead screw is symmetrically provided with helical guide grooves, and both ends of the reciprocating lead screw are provided with steering grooves, the steering grooves and the guide grooves... The guide groove is inclined at a greater angle than the steering groove on the surface of the reciprocating lead screw; the steering groove and the guide groove are slidably connected by a crescent pin, which is fixedly connected to the mounting base; a cable guide frame is installed at the top of the mounting base to prevent the cable from getting stuck, the cable guide frame includes a connecting plate, the top of the mounting base is fixedly connected to a funnel-shaped connecting plate, the two ends of the connecting plate are rotatably connected to second rollers, and multiple first rollers are rotatably connected between the two connecting plates, the first rollers and the second rollers are perpendicular to each other, and the first rollers are distributed in a figure-eight shape on the surface of the connecting plate.

[0007] Preferably, one end of the drum is fixedly connected to a fixed shaft, a bearing is installed on the side wall of the fixed shaft, the bearing is rotatably connected to the interior of a bearing seat, and the bearing seat is fixed to the surface of the support frame.

[0008] Preferably, the drive mechanism includes a motor, which is fixed to the surface of the support frame; a connecting shaft is installed between the motor and the gearbox, and main sprockets are fixedly connected to the output shaft of the gearbox and the side wall of the fixed shaft, and the main sprockets are connected to each other by a main chain; a secondary sprocket is installed at one end of the reciprocating screw, and the secondary sprocket is connected to one of the main sprockets on the surface of the fixed shaft by a secondary chain.

[0009] Preferably, a fixing frame is fixedly connected to the surface of the support frame, and a clamping plate is rotatably connected to one end of the fixing frame. A spring is installed between the clamping plate and the fixing frame. Adjusting sprockets are rotatably connected to both ends of the clamping plate, and the adjusting sprockets respectively engage the main chain and the secondary chain.

[0010] Preferably, the side wall of the bearing mounting base is fixedly connected to a guide rod and a protective tube with a groove at the bottom, the inside of the protective tube is rotatably connected to a reciprocating lead screw, and the protective tube is slidably connected to the mounting base; the side wall of the mounting base is symmetrically rotatably connected to multiple rollers, and the rollers are slidably connected to the guide rod.

[0011] Preferably, a control mechanism is installed inside the vehicle body, the control mechanism including a transformer and a programmable controller, with the transformer and programmable controller installed at one end of the vehicle body; a support rod is installed on the surface of the support frame, and a junction box is installed at one end of the support rod and inside the vehicle body respectively; a bearing is installed on the side wall of the support rod, the bearing is fixed to the side wall of the mounting plate, and the mounting plate is fixed to the side wall of the drum by multiple bolts, with one end of the support rod extending into the inside of the drum; a mounting frame and a terminal block are fixedly connected to the side wall of the mounting plate, and the terminal block on the surface of the side wall of the mounting plate is electrically connected to the cable and multiple carbon brushes; the carbon brushes fixed to the side wall of the mounting frame are slidably connected to a metal ring, and multiple metal rings are fixedly connected to the support rod, with the terminal block located on the side wall of the support rod electrically connected to the metal rings.

[0012] Preferably, a dynamic torque sensor is mounted on the side wall of the connecting shaft, and the dynamic torque sensor is electrically connected to the programmable controller.

[0013] Preferably, the programmable controller is electrically connected to the transformer, the motor, and the electric track, and the terminal block located on the side wall of the support rod is connected to the transformer and the junction box inside the vehicle body respectively through wires, and the junction box inside the vehicle body is connected to the electric excavator through wires.

[0014] Compared with related technologies, the automatic following cable reel trolley for electric excavators provided by this invention has the following advantages: This invention provides an automatic following cable reel for an electric excavator. When the cable is wound around the surface of the rotating drum, the reciprocating screw rotates, causing the guide groove to rotate. The crescent pin moves within the helical guide groove. The helical guide groove pushes the crescent pin, the mounting base, and the cable guide along the reciprocating screw in a straight line. The cable guide moves the cable to one side of the drum, ensuring the cable is evenly wound around the drum surface. When the crescent pin reaches the end of the guide groove and enters the turning groove, the cable has already wound the last turn of one layer at the edge of the drum, and the first turn of the next layer of cable needs to be wound at this position. The crescent pin moves along the turning groove. Because the inclination angle of the guide groove on the surface of the reciprocating screw is greater than that of the turning groove on the surface of the reciprocating screw, the angle at the turning groove changes. When the reciprocating screw rotates one revolution, the distance the cable guide moves along the guide groove is greater than the distance the cable guide moves along the turning groove, extending the cable guide at the edge of the drum. The dwell time allows the cable guide to complete the last turn of cable winding in one layer at the edge of the drum while the guide changes direction in the steering groove, and then winds the first turn of the next layer of cable at this position, thus ensuring that the cable is evenly wound on the surface of the drum. Similarly, the principle of the drum releasing the cable is as described above. When the cable moves inside the cable guide, it contacts the first roller and the second roller respectively, driving them to rotate, reducing the resistance of the cable moving inside the cable guide. At the same time, the rollers fix the cable between the two connecting plates, causing the cable guide to drive the cable along the reciprocating screw. When the vehicle body turns, the angle between the cable behind the vehicle body and the vehicle body changes. Since the first rollers are distributed in a figure-eight shape on the surface of the connecting plates, when the cable rotates, it contacts multiple inclined first rollers, providing support to the side walls of the cable, facilitating the cable to change angle inside the cable guide, thereby preventing the cable from getting stuck. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of a preferred embodiment of the automatic following cable reeling and laying trolley for electric excavators provided by the present invention. Figure 2 for Figure 1 The diagram shows the internal structure of the vehicle body; Figure 3 for Figure 2 The diagram shows an enlarged view of the structure at point A. Figure 4 for Figure 1The diagram shown is a top view of the vehicle's internal structure. Figure 5 for Figure 2 The diagram shows the internal structure of the reel. Figure 6 for Figure 2 The side view of the cable tray structure shown; Figure 7 for Figure 6 The top view of the connecting plate structure shown; Figure 8 for Figure 6 The diagram shows a reciprocating lead screw structure. Figure 9 This is a schematic diagram of the circuit control logic provided by the present invention; Figure 10 A flowchart of cable winding and unwinding provided for this invention.

[0016] Numbered in the diagram: 1. Vehicle body; 11. Electric track; 2. Drum; 21. Bearing housing; 22. Cable; 23. Fixed shaft; 24. Bearing; 3. Drive mechanism; 31. Main sprocket; 32. Main chain; 33. Secondary chain; 34. Clamping plate; 35. Adjusting sprocket; 36. Fixed frame; 37. Motor; 38. Gearbox; 39. Secondary sprocket; 310. Spring; 311. Connecting shaft; 4. Cable guide assembly; 41. Bearing mounting base; 42. Guide rod; 43. 44. Protective tube, 45. Roller, 46. Mounting base, 47. Reciprocating screw, 48. Guide groove, 49. Crescent pin, 50. Steering groove, 6. Cable guide, 71. First roller, 52. Connecting plate, 53. Second roller, 6. Dynamic torque sensor, 74. Control mechanism, 75. Transformer, 76. Programmable controller, 77. Support rod, 78. Metal ring, 79. Carbon brush, 70. Mounting bracket, 71. Terminal block, 72. Junction box, 73. Mounting plate, 8. Support frame. Detailed Implementation

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0018] Please see Figures 1 to 10 , Figure 1 This is a schematic diagram of a preferred embodiment of the automatic following cable reeling and laying trolley for electric excavators provided by the present invention. Figure 2 for Figure 1 The diagram shows the internal structure of the vehicle body; Figure 3 for Figure 2 The diagram shows an enlarged view of the structure at point A. Figure 4 for Figure 1 The diagram shown is a top view of the vehicle's internal structure. Figure 5 for Figure 2 The diagram shows the internal structure of the reel. Figure 6 for Figure 2 The side view of the cable tray structure shown; Figure 7 for Figure 6 The top view of the connecting plate structure shown; Figure 8 for Figure 6 The diagram shows a reciprocating lead screw structure. Figure 9 A schematic diagram of the circuit control logic provided by the present invention; Figure 10 This invention provides a flowchart of cable winding and unwinding. An automatic following cable winding and unwinding vehicle for an electric excavator includes a vehicle body 1. An electric track 11 is mounted on the bottom of the vehicle body 1. A support frame 8 for supporting a drum 2 is fixedly connected inside the vehicle body 1. A cable 22 is wound around the surface of the drum 2. A fixed shaft 23 is fixedly connected to one end of the drum 2. A bearing 24 is mounted on the side wall of the fixed shaft 23. The bearing 24 is rotatably connected to the interior of a bearing seat 21, and the bearing seat 21 is fixed to the surface of the support frame 8. When the drum 2 rotates to wind and unwind the cable 22, the drum 2 drives the fixed shaft 23 to rotate. The bearing 24 fixes one end of the fixed shaft 23 inside the bearing seat 21. The support frame 8 provides support for the fixed shaft 23 and the drum 2 through the bearing seat 21 and the bearing 24, facilitating the rotation of the drum 2.

[0019] The interior of the vehicle body 1 houses a drive mechanism 3 for moving the drum 2 and the cable assembly 4. The drive mechanism 3 includes a motor 37, which is fixed to the surface of the support frame 8. A connecting shaft 311 is installed between the motor 37 and the reduction gearbox 38, allowing the motor 37 to drive the reduction gearbox 38. The output shaft of the reduction gearbox 38 and the side wall of the fixed shaft 23 are both fixedly connected to main sprockets 31, which are connected by a main chain 32. By changing the diameters of the main sprockets 31 on the output shaft surface of the reduction gearbox 38 and the output shaft surface of the fixed shaft 23, the transmission ratio between them is adjusted, controlling the rotational speed of the drum 2. A secondary sprocket 39 is installed at one end of the reciprocating screw 46. The sprocket 39 is connected to one of the main sprockets 31 on the surface of the fixed shaft 23 via a secondary chain 33. When the motor 37 operates, the output shaft of the motor 37 drives the connecting shaft 311 to rotate, and the connecting shaft 311 drives the gearbox 38 to operate, adjusting the power and speed output of the connecting shaft 311. This facilitates the uniform rotation of the fixed shaft 23 and the drum 2 via the main sprocket 31 and the main chain 32. The rotation of the fixed shaft 23 drives the reciprocating screw 46 to rotate via the secondary chain 33 and the secondary sprocket 39. During the winding and unwinding process of the drum 2, the rotation of the reciprocating screw 46 drives the cable guide assembly 4 to move back and forth continuously, facilitating the uniform winding of the cable 22 around the side wall of the drum 2 or the uniform unwinding of the cable 22 from the side wall of the drum 2.

[0020] The cable guide assembly 4 includes a bearing mounting base 41. One end of the support frame 8 is symmetrically fixedly connected to the bearing mounting base 41. The bearing mounting base 41 is rotatably connected to the reciprocating screw 46. Bearings are installed at both ends of the reciprocating screw 46, and the bearings are fixed inside the bearing mounting base 41, thereby providing support for the reciprocating screw 46 by the bearing mounting base 41. The surface of the reciprocating screw 46 is symmetrically provided with helical guide grooves 47, and both ends of the reciprocating screw 46 are provided with turning grooves 49. The turning grooves 49 communicate with the guide grooves 47. The inclination angle of the guide grooves 47 on the surface of the reciprocating screw 46 is greater than the inclination angle of the turning grooves 49 on the surface of the reciprocating screw 46. A crescent pin 48 is slidably connected inside the turning grooves 49 and the guide grooves 47. The crescent pin 48 is fixedly connected to the mounting base 45. A cable guide frame 5 for preventing the cable 22 from getting stuck is installed at the top of the mounting base 45. The cable guide frame 5 includes a connecting plate 52. A funnel-shaped connecting plate 52 is fixedly connected to the top end of the connecting plate 52. Second rollers 53 are rotatably connected to both ends of the connecting plate 52. Multiple first rollers 51 are rotatably connected between the two connecting plates 52. The first rollers 51 and the second rollers 53 are perpendicular to each other, and the first rollers 51 are distributed in a figure-eight pattern on the surface of the connecting plate 52. When the cable 22 is wound around the surface of the rotating drum 2, the reciprocating screw 46 rotates, driving the guide groove 47 to rotate. The crescent pin 48 moves in the spiral guide groove 47. The spiral guide groove 47 pushes the crescent pin 48, the mounting base 45, and the cable guide 5 to move linearly along the reciprocating screw 46. By reasonably adjusting the diameters of the main sprocket 31 and the secondary sprocket 39, the rotational speed of the secondary sprocket 39 and the reciprocating screw 46 is adjusted, thereby controlling the speed of the cable guide 5 moving on the reciprocating screw 46, making it easier for the cable guide 5 to evenly wind the cable 22 around the surface of the drum 2.The cable guide 5 drives the cable 22 to move on one side of the drum 2, so that the cable 22 is evenly wound around the surface of the drum 2. When the crescent pin 48 moves to the end of the guide groove 47 and enters the turning groove 47, the cable 22 has already wound the last turn of the layer at the edge of the drum 2, and at this position, the first turn of the next layer of cable 22 needs to be wound. The crescent pin 48 moves along the turning groove 47. Since the guide groove 47 has an inclination angle greater than that of the reciprocating screw 46, the cable 22 is wound at the end of the last turn of the layer at the edge of the drum 2. The angle of inclination of the groove 49 on the surface of the reciprocating lead screw 46 changes. When the reciprocating lead screw 46 rotates one revolution, the distance the wire guide 5 moves along the guide groove 47 is greater than the distance the wire guide 5 moves along the turning groove 49. This prolongs the time the wire guide 5 stays at the edge of the drum 2, allowing the wire guide 5 to complete the winding of the last turn of cable 22 in one layer at the edge of the drum 2 while the turning groove 49 changes its direction of movement, and to wind the next layer of cable 22 at this position. The first turn ensures that the cable 22 is evenly wound around the surface of the drum 2. Similarly, the principle of the drum 2 releasing the cable 22 is as described above. When the cable 22 moves inside the cable guide 5, it contacts the first roller 51 and the second roller 53 respectively, causing them to rotate. This reduces the resistance to the cable 22's movement inside the cable guide 5. Simultaneously, the rollers fix the cable 22 between the two connecting plates 52, causing the cable guide 5 to move. The cable 22 moves along the reciprocating screw 46; when the vehicle body 1 turns, the angle between the cable 22 and the vehicle body 1 changes. Since the first rollers 51 are distributed in a figure-eight shape on the surface of the connecting plate 52, when the cable 22 rotates, the cable 22 contacts the multiple inclined first rollers 51, which improves the support of the side wall of the cable 22, making it easier for the cable 22 to change its angle inside the cable guide frame 5, thereby avoiding the situation where the cable 22 gets stuck; and as attached. Figure 7 As shown, the bending angle R formed by the combination of multiple first rollers 51 is less than the maximum safe bending angle of the cable 22, thereby protecting the internal structure of the cable 22 from damage.

[0021] The support frame 8 is fixedly connected to a fixing frame 36. One end of the fixing frame 36 is rotatably connected to a clamping plate 34. A spring 310 is installed between the clamping plate 34 and the fixing frame 36. Both ends of the clamping plate 34 are rotatably connected to adjusting sprockets 35. The adjusting sprockets 35 respectively engage the main chain 32 and the secondary chain 33. The spring 310 is in a contracted state, pulling the clamping plate 34 to rotate, so that the adjusting sprockets 35 at both ends of the clamping plate 34 always squeeze the main chain 32 and the secondary chain 33, keeping the main chain 32 and the secondary chain 33 in a straight state, which better transmits power. Moreover, the movement of the main chain 32 and the secondary chain 33 drives the adjusting sprockets 35 to rotate, reducing the resistance of the movement of the main chain 32 and the secondary chain 33.

[0022] The side wall of the bearing mounting base 41 is fixedly connected to a guide rod 42 and a protective tube 43 with a groove at the bottom. The inside of the protective tube 43 is rotatably connected to a reciprocating screw 46, and the protective tube 43 is slidably connected to the mounting base 45. The protective tube 43 prevents the reciprocating screw 46 from being exposed, making it easier for the reciprocating screw 46 to push the mounting base 45 to move. The side wall of the mounting base 45 is symmetrically rotatably connected to multiple rollers 44, and the rollers 44 are rollingly connected to the guide rod 42. When the mounting base 45 moves, the mounting base 45 drives the rollers 44 to rotate along the side wall of the guide rod 42. The guide rod 42 limits and guides the mounting base 45, so that the mounting base 45 can only move linearly along the reciprocating screw 46.

[0023] The control mechanism 7 is installed inside the vehicle body 1. The control mechanism 7 includes a transformer 71 and a programmable controller 72. The transformer 71 and the programmable controller 72 are installed at one end of the vehicle body 1. A support rod 73 is installed on the surface of the support frame 8. A junction box 78 is installed at one end of the support rod 73 and inside the vehicle body 1, respectively. A bearing 24 is installed on the side wall of the support rod 73. The bearing 24 is fixed to the side wall of the mounting plate 79, and the mounting plate 79 is fixed to the side wall of the drum 2 by multiple bolts. One end of the support rod 73 extends into the inside of the drum 2. The side wall of the mounting plate 79 is fixedly connected to the mounting frame 76 and the terminal block 77. The terminal block 77 on the surface of the side wall of the mounting plate 79 is electrically connected to the cable 22 and multiple carbon brushes 75. The carbon brushes are fixed to the side wall of the mounting frame 76. The support rod 73 is fixedly connected to multiple metal rings 74, and the terminal 77 located on the side wall of the support rod 73 is electrically connected to the metal rings 74. When the drum 2 rotates, the drum 2 drives the mounting plate 79, the mounting bracket 76 and the carbon brush 75 to rotate. The carbon brush 75 rotates on the surface of the metal ring 74, and the two always maintain contact. The other end of the cable 22 is connected to the power grid. The power grid transmits electricity through the cable 22, the carbon brush 75 and the metal rings 74 into the transformer 71 and the junction box 78 inside the vehicle body 1. The transformer 71 changes the voltage and transmits the electricity to the cable vehicle. The junction box 78 inside the vehicle body 1 is connected to the electric excavator through wires to ensure the operation of the electric excavator and the cable vehicle.

[0024] A dynamic torque sensor 6 is installed on the side wall of the connecting shaft 311, and the dynamic torque sensor 6 is electrically connected to the programmable controller 72. The programmable controller 72 is electrically connected to the transformer 71, the motor 37, and the electric track 11. The terminal 77 located on the side wall of the support rod 73 is connected to the transformer 71 and the junction box 78 inside the vehicle body 1 through wires. The junction box 78 inside the vehicle body 1 is connected to the electric excavator through wires. In order to facilitate the dynamic torque sensor 6 to monitor the torsional torque of the connecting shaft 311, the dynamic torque sensor 6 uploads the information to the programmable controller 72. The programmable controller 72 controls the operation of the motor 37 and the electric track 11 based on the received information.

[0025] The working principle of the automatic following cable reel for electric excavators provided by this invention is as follows: During use, one end of the cable 22 enters the interior of the drum 2 and connects to the terminal 77 on the surface of the mounting plate 79. The carbon brush 75 and the metal ring 74 are always in contact. The other end of the cable 22 is connected to the high-voltage power grid. The power grid transmits electricity through the cable 22, the carbon brush 75, and the metal ring 74 into the transformer 71 and the junction box 78 inside the vehicle body 1. The transformer 71 changes the voltage and transmits the electricity to the cable trolley. The junction box 78 inside the vehicle body 1 is connected to the electric excavator through wires, ensuring the operation of the electric excavator and the cable trolley.

[0026] When the electric excavator moves, the automatic following module inside the programmable controller 72 operates, controlling the operation of the electric track 11 so that the vehicle body 1 follows the electric excavator, facilitating the replenishment of power to the electric excavator. During use, the cable 22 exerts a certain tension on the drum 2 and the fixed shaft 23. The fixed shaft 23 transmits the tension to the connecting shaft 311 via a chain. The dynamic torque sensor 6 collects the torque received on the surface of the connecting shaft 311, denoted as t1. The dynamic torque sensor 6 uploads the monitored information to the programmable controller 72. The maximum torque threshold T1 and the minimum torque threshold T2 borne by the connecting shaft 311 are pre-set in the judgment module inside the programmable controller 72.

[0027] As the vehicle body 1 moves forward with the electric excavator, gradually tightening the cable 22, the cable 22 becomes increasingly taut, and t1 gradually increases. When the motor 37 is not operating and t1 > T1, the judgment module activates the motor 37 and controls its direction. The output shaft of the motor 37 drives the connecting shaft 311 to rotate, which in turn drives the reduction gearbox 38. The output shaft of the reduction gearbox 38, through the main sprocket 31 and the main chain 32, drives the fixed shaft 23 and the drum 2 to rotate, causing the cable 22 to unwind from the side wall of the drum 2. At this time, the torque borne by the connecting shaft 311 is... Part of the torque comes from the power torque transmitted by the operation of the motor 37, and the other part comes from the tension torque of the cable 22 on the connecting shaft 311. The two torques are in opposite directions. When the motor 37 drives the connecting shaft 311 to rotate, the torque monitored by the dynamic torque sensor 6 decreases rapidly and changes direction. At this time, t1 < T2. As the cable 22 is gradually released, the power torque transmitted by the operation of the motor 37 remains unchanged, and the tension torque of the cable 22 on the connecting shaft 311 gradually decreases, and t1 gradually increases. When T2 < t1 < T1, it indicates that the length of the cable 22 that has been unwound is appropriate. At this time, the judgment module operates, the motor 37 is turned off, and the cable release is stopped.

[0028] Similarly, when the vehicle body 1 moves backward, causing the cable 22 to gradually loosen, the cable 22 is in a slack state, and t1 gradually decreases. When the motor 37 is not working and t1 < T2, the judgment module operates, turns on the motor 37, and controls the direction of the motor 37 to drive the drum 2 to rotate, so that the cable 22 is wound around the surface of the drum 2. As the drum 2 rotates, the torque borne by the connecting shaft 311 at this time comes partly from the power torque transmitted by the operation of the motor 37, and partly from the pulling torque of the cable 22 on the connecting shaft 311. The two torques are in opposite directions. When the motor 37 operates and drives the connecting shaft 311 to rotate, the torque monitored by the dynamic torque sensor 6 decreases rapidly and then suddenly increases after changing direction. At this time, t1 > T1. As the cable 22 is tightened, the power torque transmitted by the motor 37 remains constant, while the torque of the cable 22 on the connecting shaft 311 increases, and t1 gradually decreases. When T2 < t1 < T1, it indicates that the length of the cable 22 wound up is appropriate. At this point, the judgment module operates, shuts down the motor 37, and stops winding. During the movement of the vehicle body 1, the cable 22 is automatically wound and unwound according to the torque received by the output shaft of the motor 37, ensuring the safe winding and unwound of the cable 22 and preventing it from breaking.

[0029] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. An automatic following cable reeling and laying trolley for electric excavators, characterized in that, include: The vehicle body (1) has an electric track (11) installed at the bottom end of the vehicle body (1), and a support frame (8) for providing support for the drum (2) is fixedly connected inside the vehicle body (1). The surface of the drum (2) is wound with a cable (22). The vehicle body (1) is equipped with a drive mechanism (3) for moving the drum (2) and the cable assembly (4). The cable assembly (4) includes a bearing mounting seat (41). One end of the support frame (8) is symmetrically fixedly connected to the bearing mounting seat (41). The bearing mounting seat (41) is rotatably connected to the reciprocating screw (46). The surface of the reciprocating screw (46) is symmetrically provided with spiral guide grooves (47). Both ends of the reciprocating screw (46) are provided with steering grooves (49). The steering grooves (49) are connected to the guide grooves (47). The angle of inclination of the guide grooves (47) on the surface of the reciprocating screw (46) is greater than the angle of inclination of the steering grooves (49) on the surface of the reciprocating screw (46). The interior of the steering grooves (49) and the guide grooves (47) is slidably connected with crescent pins (48). The crescent pins (48) are fixedly connected to the mounting seat (45). The top of the mounting base (45) is fitted with a cable guide (5) to prevent the cable (22) from getting stuck. The cable guide (5) includes a connecting plate (52). The top of the mounting base (45) is fixedly connected to the connecting plate (52) with a funnel-shaped surface. The two ends of the connecting plate (52) are rotatably connected to second rollers (53). Multiple first rollers (51) are rotatably connected between the two connecting plates (52). The first rollers (51) and the second rollers (53) are perpendicular to each other, and the first rollers (51) are distributed in a figure-eight shape on the surface of the connecting plate (52).

2. The automatic following cable reeling trolley for electric excavators according to claim 1, characterized in that, One end of the drum (2) is fixedly connected to a fixed shaft (23), and a bearing (24) is installed on the side wall of the fixed shaft (23). The bearing (24) is rotatably connected to the inside of the bearing seat (21), and the bearing seat (21) is fixed to the surface of the support frame (8).

3. The automatic following cable reeling trolley for electric excavators according to claim 2, characterized in that, The drive mechanism (3) includes a motor (37), which is fixed to the surface of the support frame (8); a connecting shaft (311) is installed between the motor (37) and the gearbox (38); the output shaft of the gearbox (38) and the side wall of the fixed shaft (23) are both fixedly connected to the main sprocket (31); the main sprockets (31) are connected to each other by a main chain (32); a secondary sprocket (39) is installed at one end of the reciprocating screw (46); the secondary sprocket (39) is connected to one of the main sprockets (31) on the surface of the fixed shaft (23) by a secondary chain (33).

4. The automatic following cable reel trolley for electric excavators according to claim 3, characterized in that, The support frame (8) is fixedly connected to a fixing frame (36), one end of the fixing frame (36) is rotatably connected to a clamping plate (34), and a spring (310) is installed between the clamping plate (34) and the fixing frame (36); both ends of the clamping plate (34) are rotatably connected to adjusting sprockets (35), and the adjusting sprockets (35) respectively mesh with the main chain (32) and the secondary chain (33).

5. The automatic following cable reeling trolley for electric excavators according to claim 1, characterized in that, The side wall of the bearing mounting base (41) is fixedly connected to a guide rod (42) and a protective tube (43) with a groove at the bottom. The inside of the protective tube (43) is rotatably connected to a reciprocating screw (46), and the protective tube (43) is slidably connected to the mounting base (45). The side wall of the mounting base (45) is symmetrically rotatably connected to multiple rollers (44), and the rollers (44) are slidably connected to the guide rod (42).

6. The automatic following cable reeling trolley for electric excavators according to claim 3, characterized in that, The control mechanism (7) is installed inside the vehicle body (1). The control mechanism (7) includes a transformer (71) and a programmable controller (72). The transformer (71) and the programmable controller (72) are installed at one end of the vehicle body (1). A support rod (73) is installed on the surface of the support frame (8). A junction box (78) is installed at one end of the support rod (73) and inside the vehicle body (1). A bearing (24) is installed on the side wall of the support rod (73). The bearing (24) is fixed to the side wall of the mounting plate (79), and the mounting plate (79) is fixed to the drum (2) by multiple bolts. The side wall of the mounting plate (79) is fixedly connected to the mounting bracket (76) and the terminal block (77). The terminal block (77) on the surface of the side wall of the mounting plate (79) is electrically connected to the cable (22) and a plurality of carbon brushes (75). The carbon brushes (75) fixed to the side wall of the mounting bracket (76) are slidably connected to the metal rings (74). The support rod (73) is fixedly connected to a plurality of the metal rings (74). The terminal block (77) on the side wall of the support rod (73) is electrically connected to the metal rings (74).

7. The automatic following cable reeling trolley for electric excavators according to claim 6, characterized in that, A dynamic torque sensor (6) is mounted on the side wall of the connecting shaft (311), and the dynamic torque sensor (6) is electrically connected to the programmable controller (72).

8. The automatic following cable reeling trolley for electric excavators according to claim 6, characterized in that, The programmable controller (72) is electrically connected to the transformer (71), the motor (37), and the electric track (11). The terminal block (77) located on the side wall of the support rod (73) is connected to the transformer (71) and the junction box (78) inside the vehicle body (1) respectively through wires. The junction box (78) inside the vehicle body (1) is connected to the electric excavator through wires.

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