Rod descending mechanism for automatic lifting current collector of trolley bus

Abstract

The invention relates to a rod descending mechanism of an automatic lifting current collector of a trolley bus. The rod descending mechanism is mainly composed of a base, a rotating seat, a pitching arm, a large tension spring, a trolley rod and a current collecting head. One end of the pitching arm is hinged to the rotating seat, the trolley pole is fixed to the other end of the pitching arm, and the current collecting head is installed at the tail end of the trolley pole. The two ends of the large tension spring are hinged to the rotating base and the pitching arm respectively. The mechanism is further provided with a brake to control rotation of the rotating seat and an electric rope winder, and the electric rope winder is connected with the trolley pole through an internal pull rope, so that lifting control over the trolley pole is achieved. The control module is responsible for monitoring the electric connection state of the current collector and operating the brake and the electric rope winder according to the electric connection state so as to quickly respond to and process the rod descending requirement. According to the design, a traditional descending rod and an aligning air cylinder are abandoned, the overall height of equipment is reduced, the available space in a compartment is increased, the structure is simplified, the reaction speed is increased, and the running safety of the trolley bus is enhanced.

Description

Technical Field

[0001] The invention relates to the field of trolleybuses, and in particular to a rod lowering mechanism for automatically raising and lowering a current collector of a trolleybus. Background Art

[0002] The trolleybus relies on the collector installed on the top of the vehicle to contact the positive and negative busbars to conduct electrical energy to the vehicle as the vehicle's power source; it generally includes a collector pole, a collector head and a pitch arm. The collector head is set on the collector pole, the collector pole is set at the end of the pitch arm, and the proximal end of the pitch arm is hinged and installed on the roof. The collector pole is raised and lowered by the pitch of the collector pole. When working, the pitch arm is raised to make the collector pole contact the busbar to achieve electrical conduction. When the vehicle is off work or there are other special circumstances, the pitch arm is lowered to achieve the storage of the collector pole.

[0003] Since trolleybuses use high voltage electricity, the various actuating mechanisms of traditional control collectors cannot use flammable hydraulic oil, but can only use pneumatic cylinders. However, gas is compressible, resulting in insufficient response speed and accuracy of various actions.

[0004] Furthermore, in actual applications, due to complex road conditions, trolleybuses are required to be able to operate normally even when they deviate from the busbar by a certain angle. Therefore, the current collector also needs to have the function of horizontal rotation, that is, the proximal end of the pitch arm should be hinged on a rotating body, and the rotating body can rotate horizontally relative to the vehicle body. However, the rotating body itself should be centered before the lifting rod. In this way, when the vehicle is parked within a certain range, the pitch arm can be raised to allow the current collector head to be stuck into the busbar. Therefore, a return cylinder is generally required. The two ends of the return cylinder are respectively hingedly connected to the bracket and the rotating body fixed on the roof. The return cylinder is activated to control the rotation angle of the rotating body to restore it to the center position.

[0005] The lifting and lowering of the collector pole (i.e. the pitching movement of the pitch arm) is achieved by the cooperation of the descending cylinder and the large tension spring. One end of the descending cylinder and the large tension spring are respectively hingedly installed on the rotating body, and the other end is connected to the pitch arm. The two jointly control the up and down swinging of the collector pole in the vertical plane; the large tension spring elastically maintains the raised state of the collector pole, so that the collector head at the far end of the collector pole contacts the busbar to maintain pressure, forming electrical conduction, commonly known as networking.

[0006] When lowering the boom, the lowering cylinder is pressurized and extended, pressing down the pitch arm and the collector rod, overcoming the upward pulling force of the large tension spring and completing the lowering action;

[0007] When the rod is raised, the lowering cylinder releases pressure, and the tension of the large tension spring drives the pitch arm and the collector rod to complete the upward movement.

[0008] When turning or overtaking, the busbar is located on one side of the vehicle, which is a case of off-line driving. If the vehicle is too off-line, the collector pole may be disconnected from the grid, and the pitch arm after disconnection will rise rapidly under the action of the large tension spring. In addition, the vehicle is often in a moving state at this time, and the inertial rotation of the rotating body, so the pitch arm after disconnection will often hit the contact line strongly, causing a fault. Therefore, those skilled in the art have been pursuing a collector that can quickly lower the pole when disconnected from the grid to avoid interrupting the contact line network.

[0009] At the same time, since all the above-mentioned structural components are installed on the roof, and each component is large in size, it occupies the space above the roof. For safety reasons, the distance between the roof and the busbar must not be lower than the specified value. In other words, without modifying the power grid, the highest point of the roof component is restricted. If the height of the component is large, it will inevitably squeeze the space inside the car. Summary of the invention

[0010] The technical problem to be solved by the present invention is how to avoid a sudden and large upward tilt when the current collector is accidentally disconnected from the grid, thereby causing a collision with the contact wire network or other objects and causing a malfunction.

[0011] The specific technical solution of the present invention to solve the above technical problems is:

[0012] A rod lowering mechanism for an automatic lifting collector of a trolleybus comprises a base, a rotating seat, a pitching arm, and a large tension spring. The rotating seat can be arranged on the base in a horizontally rotatable manner, and the pitching arm comprises a mounting end and a working end; the mounting end of the pitching arm is hingedly mounted on the rotating seat, one end of the large tension spring is hinged on the rotating seat, and the other end is hinged on the pitching arm, the working end of the pitching arm fixes one end of a collector rod, and the other end of the collector rod is the working end, and a collector head is fixed to the working end of the collector rod; the rotating seat, the pitching arm, the collector rod, and the collector head are arranged in a common vertical plane, and the collector head is used to contact a busbar to electrically conduct the power grid and the vehicle, and they are installed together on the top of the vehicle.

[0013] Also included is a brake for controlling the rotational movement of the rotating seat;

[0014] It also includes an electric rope reel, which is fixed to the rear of the vehicle. A pull rope is provided inside the electric rope reel, and a free end of the pull rope is fixed to a position of the collector rod close to the working end;

[0015] It also includes a control module, which is used to monitor the electrical connection status of the collector in real time and control the actions of the brake and the electric rope winder.

[0016] The control module detects the electrical connection status of the collector pole and controls the coordinated operation of the electric rope reel and the brake; when the pole is lowered, the control module controls the damping force generated by the brake to be smaller than the component force of the pull rope in the horizontal direction.

[0017] The rod lowering steps of the rod lowering mechanism are as follows:

[0018] S1, the control module receives a mast lowering signal for emergency mast lowering triggered by human control or system;

[0019] S2, the control module controls the immediate start of the brake and the electric rope reel. The brake generates braking force, and the electric rope reel quickly and continuously reels the rope, driving the collector pole, the pitch arm, and the rotating seat to rotate in the direction of the electric rope reel, and synchronously drives the collector pole and the pitch arm to pitch down. The control module controls the force driving the rotation to be greater than the force of the brake to prevent the rotating seat from rotating. The two together control the collector head to move in the direction of the rope reel.

[0020] S3, the collector head, collector pole and pitch arm move to the specified position, the control module controls the stop brake and electric rope winder, and the pole lowering is completed.

[0021] The steps for triggering the emergency lowering command are as follows:

[0022] S11, the control module continuously detects the voltage of the electrical connection of the collector;

[0023] S12, determine the reduction amplitude of the collected voltage per unit time. If the voltage reduction amplitude is greater than the set threshold, it is considered that the collector is off the grid and an emergency pole lowering instruction is triggered. Otherwise, return to step S11 for continuous detection.

[0024] This solution has the following beneficial effects compared to the prior art:

[0025] This solution eliminates the lowering cylinder and auxiliary structures in the traditional collector structure, eliminates the return cylinder and auxiliary structures, and releases the space originally occupied by these structures in the height direction, thereby reducing the overall height of the collector when the pole is lowered and increasing the space in the cabin. This solution simplifies the overall structure and base, reduces the number, weight, and inertia of moving parts, reduces the high-position weight of the vehicle by nearly 100 kilograms, lowers the center of gravity of the vehicle, saves energy and reduces consumption, and uses an electric rope winder to achieve the raising and lowering of the pitch arm. Compared with traditional cylinders, it has a fast response speed, making it easier to control and adjust the height and position of the collector pole.

[0026] In the traditional structure with a return cylinder, the return cylinder dynamically follows the reciprocating motion when the rotating seat rotates, and the cylinder volume changes alternately, and the intake and exhaust alternately, which brings resistance to the translational motion. This state is commonly known as "breathing". This solution eliminates the return cylinder, making the resistance of the rotating seat smaller and easier to control.

[0027] This solution adds a brake to control the rotation of the rotating seat, and controls the length of the pull rope through the rapid and continuous action of the electric rope winder, directly controlling the geometric height of the collector, avoiding the uncontrolled left and right swinging and large-scale upward bouncing of the collector pole when the collector is greatly deviated from the grid. The rapid response avoids accidents such as hanging on the net, pulling the wire, hitting the pole, damaging the wire network or nearby facilities, pedestrians, etc. caused by the slow response speed of the action mechanism.

[0028] Preferably, the brake comprises a brake shoe and a brake disc, the brake shoe is arranged on the base or rotating seat, the brake disc is arranged on the rotating seat or the base, the brake shoe moves to rub the brake disc to achieve braking; the power source of the brake shoe movement is an electromagnet or a stepper motor. The electric actuator has a fast response speed and can respond within milliseconds. Once it is disconnected from the network, it immediately intervenes to control the rotating seat to prevent it from rotating left and right. The electromagnet itself is a linear motion, and the stepper motor itself is a rotary motion, which can be converted into a linear motion through a thread or a gear rack. The gap between the brake shoe and the brake disc is very small, so a fast response can be achieved.

[0029] Preferably, the brake comprises a stepper motor and a toothed disc, the toothed disc is provided with gear teeth, the output shaft of the stepper motor is provided with a gear, and the gear is meshed with the gear teeth on the toothed disc. By combining the gear and the toothed disc, a more precise control of the rotation angle can be achieved based on the accuracy of the stepper motor. They can also be used to correct the yaw of the lifting rod.

[0030] Preferably, the brake is a hydraulic damper, a magnetic damper, or a magnetic powder damper. Compared with the aforementioned external brake, the hydraulic damper, the magnetic damper, or the magnetic powder damper is arranged inside a closed housing, which can reduce the influence of the external environment and work more stably.

[0031] Furthermore, an angle sensor is provided on the rotating seat, and the angle sensor is used to sense the current rotation angle of the rotating seat, so as to accurately control the rotating seat to return to the correct position.

[0032] Furthermore, the brake is provided with a protective cover. In low temperature, rainy and snowy weather, the protective cover can prevent the brake from being flooded and frozen, thereby affecting the braking effect.

[0033] Furthermore, it also includes a tail hook, which is arranged at the rear part of the roof. The tail hook is provided with a positioning groove for fixing the collector pole at the closing position.

[0034] Furthermore, a guide device is provided, the position of which matches the position of the collector rod positioning slot on the tail hook, and the pull rope is connected to the collector rod through the guide device, ensuring that the pull rope can accurately pull the collector rod back to the positioning slot to achieve precise positioning.

[0035] Furthermore, it also includes an elevation angle sensor, which is used to sense the current elevation angle of the pitch arm, so that the control module can make a control logic judgment based on this data.

[0036] When this solution senses that the line is off the grid, the brake and electric rope reel will act in time. While the electric rope reel is used to reel in the rope and lower the pole, the rotation of the rotating seat is braked. The electric rope reel continuously provides a downward pulling force and a positive horizontal force component that is greater than the tension of the large tension spring through the rope. The positive horizontal force component drives the rotating seat to rotate, and the brake provides a resistance slightly smaller than the positive horizontal force component, that is, a negative force component, so that the rotating seat slowly rotates back to the positive direction; it eliminates the uncontrolled rotation of the rotating device and avoids a large bounce when the collector pole is off the grid (the length of the two fixed ends of the rope reel remains unchanged or the elasticity increases at the moment of off the grid). The response speed of electric control is much better than that of pneumatic control. The point of force of the rope on the collector pole is directly located at the action demand end, and the comprehensive response performance is good. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is a schematic diagram of the first state of the lowering rod mechanism of the automatic lifting collector of a trolleybus according to the present invention;

[0038] Figure 2 It is a schematic diagram of the structure of the rotating seat in Example 1 of the present invention;

[0039] Figure 3 It is a schematic diagram of the partial structure of the brake in Example 1 of the present invention;

[0040] Figure 4 This is a schematic diagram of the structure of the electric rope reel in Example 1 of the present invention;

[0041] Figure 5 This is a schematic diagram of the position structure of the tail hook and the guide device in Example 1 of the present invention;

[0042] Figure 6 Schematic diagram of the structure of the brake in Example 2 of the present invention;

[0043] Figure 7 Schematic diagram of the structure of the brake in Embodiment 3 of the present invention;

[0044] Figure 8 This is a schematic diagram of the specific structure of the transmission shaft in Embodiment 3 of the present invention;

[0045] Fig. 9 Schematic diagram of the force condition of the collector pole when the pole is lowered.

[0046] In the accompanying drawings, the component names represented by the reference numerals are listed as follows:

[0047] 1. Base; 2. Rotating seat; 3. Pitch arm; 4. Large tension spring; 5. Collector rod; 6. Collector head; 7. Brake shoe; 8. Brake disc; 9. Electric rope winder; 10. Pull rope; 11. Tail hook; 12. Positioning groove; 13. Guide device; 14. Protective cover; 15. Toothed disc; 16. Stepper motor; 17. Rotating shaft; 18. Damper; 19. Vertical shaft; 20. Rope storage wheel. DETAILED DESCRIPTION

[0048] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0049] Embodiment 1:

[0050] Figure 1 It is a front view of the overall arrangement. The length from the collector head 6 to the planar hinge point of the pitch arm 3 and the rotating seat 2 is about 6.5 meters. The collector rod 5 is a circular tube with a gradually changing diameter. It is an elastic slender tube. Its thick end is inserted into the pitch arm 3 and fastened thereto, and the collector head 6 is fixed to the thinner end.

[0051] The collector includes a control module, a rotating seat 2, a base 1 fixedly connected to the roof, and a pitch arm 3. A vertical axis 19 is provided on the base 1, and the vertical axis 19 is perpendicular to the roof surface. The rotating seat 2 can rotate flexibly on the vertical axis 19; it also includes a brake for controlling the rotation of the rotating seat 2, and the brake includes a brake shoe 7, a brake disc 8 and a power component for controlling the movement of the brake shoe 7. The brake disc 8 is integrally machined on the rotating seat 2, and the brake shoe 7 is arranged in pairs on the base 1. The power component can be a cylinder, a hydraulic cylinder, a motor, an electromagnet, etc., preferably a motor and an electromagnet. The rotating seat 2 is installed on the vertical axis 19 through a bearing to achieve free rotation.

[0052] The purpose of setting the brake is to brake the rotational movement of the rotating seat 2. A protective cover 14 is also provided outside the brake to prevent rain, snow and debris from entering the brake and affecting the braking effect of the brake; one end of the pitch arm 3 and one end of the large tension spring 4 are respectively hinged on the rotating seat 2, and the other end of the pitch arm 3 is fixedly connected to the collector rod 5, and the other end of the collector rod 5 is fixedly connected to the collector head 6; the other end of the large tension spring 4 is hinged to the pitch arm 3.

[0053] An electric rope winder 9 is provided at the rear of the vehicle, and the electric rope winder 9 includes a pull rope 10, a rope storage wheel 20, and an electric motor. The pull rope 10 uses a cost-effective polyester rope, and the electric motor uses a three-in-one stepper motor 16 with a motor, a driver, and a reducer available on the market, and is centrally controlled by an external control module or a vehicle control module; the two ends of the pull rope 10 are respectively connected to the collector rod 5 near the collector head 6 and the rope storage wheel 20.

[0054] A tail hook 11 is fixedly provided at the rear of the roof, and two positioning grooves 12 of the collector pole 5 are provided at the tail hook 11, and the spacing between the two positioning grooves 12 is close to the spacing of the busbar; a guide device 13 of the pull rope 10 is provided at a position corresponding to the positioning groove 12 of the tail hook 11, and a guide groove is provided corresponding to the positioning groove 12 of the collector pole 5 of the guide device 13, and the pull rope 10 passes through the guide groove to connect the collector pole 5 at least partially. The electric rope reel 9 is provided at the rear of the vehicle and the height from the ground is within 1 to 2 meters for daily maintenance. The guide groove can also be a structure such as an inclined surface or an arc with a guiding function.

[0055] In this example, the action process when lowering the pole is as follows: the control module controls the electric rope reel 9 to rotate, driving the rope storage wheel 20 to rotate and reel in the pull rope 10, and at the same time the linked control brake is braked, such as Fig. 9 As shown, assuming that the position where the collector pole and the pull rope are combined is the origin, the total tension continuously generated by the pull rope 10 is F, the upward tension of the large tension spring 4 is F3, the downward component of the pull rope tension F and the combined force of gravity is the downward pull F0, the horizontal component of the pull rope tension F is the horizontal force F1, and the damping braking force generated by the brake is the horizontal force F2, then F0>F3, and F1≥F2≥0, to achieve stable pole lowering, the brake controls the rotating seat 2 to rotate smoothly and slowly in the pulling direction of the pull rope 10; the pull rope 10 pulls down the collector pole 5 through the guide device 13 until the collector pole 5 reaches the position of the positioning slot 12 of the tail hook 11, and the pole lowering is completed. During the pole lowering process, the braking force of the brake is controlled to gradually decrease until it is zero.

[0056] The relationship of F1≥F2≥0 is based on different situations: when the vehicle is in the off-line operation and the boom is lowered, when the rotating seat 2 deviates from the return position by a large amount (estimated ±20°), F1>F2>0; when the rotating seat 2 deviates from the return position by a small amount, F1>F2, F2=0; when the pitch arm is fully returned to the center, F1=F2=0;

[0057] When the rod is raised, the motor of the electric rope reel 9 is reversed, the pull rope 10 is released, and the collector rod 5 is raised under the pulling force of the large tension spring 4.

[0058] Example 2

[0059] In the previous embodiment, the brake works by friction and is inevitably affected by the external environment, especially rainy and snowy weather. Although a protective cover 14 is provided, once water splashes onto the brake disc 8, it will affect the braking effect, thereby affecting the braking force and causing the collector posture to be uncontrolled.

[0060] In this example, see Figure 6, the brake disc 8 and the brake shoe 7 which work by friction are eliminated, the brake disc 8 is replaced by a toothed disc 15, and a stepper motor 16 is provided, wherein the stepper motor 16 has a small gear which meshes with the toothed disc 15; when the lever is lowered, the torque control of the stepper motor 16 is used to provide a damping force, thereby realizing the control of the rotation angle of the rotating seat 2.

[0061] In this solution, when the rod is raised, the stepper motor 16 can be used to accurately control the rotation angle of the rotating seat 2, so that the collector head 6 can accurately track the busbar.

[0062] Example 3

[0063] The brakes in the above two examples are both external and inevitably affected by the external environment.

[0064] In this example, see Figure 7 , the external brake is cancelled, and a transmission shaft 17 and a damper 18 are arranged coaxially with the rotating seat 2; the transmission shaft 17 passes through the hollow vertical shaft 19 in an inverted manner, the transmission shaft 17 coincides with the center of the rotating seat 2, one end of the transmission shaft 17 is fixedly connected to the rotating seat 2, and rotates together with the rotating seat 2; the damper 18 is fixedly connected to the fixed bracket, and the input end of the damper 18 is connected to the other end of the transmission shaft 17.

[0065] When the rod is lowered, the damper 18 works to provide a damping force for the rotation of the transmission shaft 17, thereby achieving control of the rotation angle of the rotating seat 2.

[0066] The damper 18 can be any general damper that can provide damping force, such as a magnetic powder damper, a magnetic damper, a hydraulic damper, etc.

[0067] Since the working parts are located inside the shell, they are no longer affected by external weather and the like.

[0068] Embodiment 4, the emergency pole lowering method when the above-mentioned current collector is off-line and off-grid, comprises the following steps:

[0069] S11, detecting the voltage of the electrical connection of the collector and the value of the elevation angle sensor;

[0070] S12, judging the fluctuation amplitude of the voltage reduction per unit time and the fluctuation value of the elevation angle sensor, if the voltage reduction amplitude is greater than the set threshold and the elevation angle value has a positive mutation and is greater than the set threshold, it is considered that the collector is off the grid and step S2 is executed, otherwise, returning to step S11 for continuous detection;

[0071] S2, the control module controls to immediately start the brake and the electric rope winder 9, and quickly retract the rope for S seconds, for example, 2 seconds, to lower the height of the collector pole 5. Because the vehicle is in an off-line operation at this time, the pitch arm has a large deflection angle with the return position, and the electric rope winder 9 drives the pull rope 10 to pull the collector pole 5. There is a component force F1 in the horizontal direction. This horizontal component force F1 will drive the rotating seat 2 to rotate, and the brake action generates a damping force F2. F2 has an opposite effect to F1, and F1>F2. As a result, the rotating seat 2 can slowly rotate in the return direction to avoid uncontrollable large-scale horizontal rotation. Within S seconds, the emergency rope retraction action is sufficient to make the collector pole 5 drop to a certain height. The purpose of this step is to control the height of the collector pole 5 to avoid the collector pole 5 from rising at the moment of being off the grid and to avoid hitting the busbar.

[0072] The control module controls the immediate activation of the brake and the electric rope winder 9, and can also feed back signals to the vehicle controller and give an audible and visual alarm to the driver; at this time, the vehicle should slow down or stop, and the vehicle signal lights should flash in accordance with regulations to give a warning.

[0073] As the pitch arm gradually returns to the normal position, the braking force of the brake can be controlled to gradually decrease until it reaches zero, so that the rotating seat 2 can rotate freely, and the electric rope reel 9 stops the rope reeling action. At this time, the pitch arm still has a certain elevation angle, but this elevation angle is lower than the elevation angle during normal operation. The collector head is located at a certain distance below the busbar. The elevation angle value should be 1 / 3 to 1 / 2 of the current working elevation angle value.

[0074] S3, the collector head (6), the collector pole (5), and the pitch arm (3) move to the specified position, the control module controls the stop brake and the electric rope reel (9), and the emergency pole lowering is completed. The staff intervenes and manually controls the electric rope reel 9 to reverse and release the pull rope 10 to achieve re-netting.

[0075] It should be noted here that because it is an emergency pole lowering, the vehicle needs to continue moving forward after the emergency situation, so the driver needs to re-set the net. Therefore, after controlling the height of the collector pole 5, there is no need to completely retract the collector pole 5 to the retracted state, which makes it easier for the driver to quickly reset the net.

[0076] In addition, the control module also reads the vehicle speed information, and when the vehicle speed is 0, the controller does not perform automatic control.

[0077] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A rod lowering mechanism for an automatic lifting collector of a trolleybus, comprising a base (1), a rotating base (2), a pitching arm (3), and a large tension spring (4); the rotating base (2) is rotatably arranged on the base (1); the pitching arm (3) comprises a mounting end and a working end; the mounting end of the pitching arm (3) is hingedly mounted on the rotating base (2); one end of the large tension spring (4) is hingedly mounted on the rotating base (2), and the other end is hingedly mounted on the pitching arm (3); the working end of the pitching arm (3) is fixed to one end of a collector rod (5); the other end of the collector rod (5) is the working end; the working end of the collector rod (5) is fixed to a collector head (6); the rotating base (2), the pitching arm (3), the collector rod (5), and the collector head (6) are arranged in a common vertical plane; the collector head is used to contact the busbar to make the power grid and the vehicle electrically conductive; they are installed together on the top of the vehicle; Features: It also includes a brake, an electric rope reel (9), and a control module, wherein the brake controls the rotation of the rotating seat (2); the electric rope reel (9) is fixed to the rear of the vehicle, a pull rope (10) is provided inside the electric rope reel (9), and the free end of the pull rope (10) is fixed to a position of the collector pole (5) close to the working end; The control module detects the electrical connection state of the collector pole and controls the coordinated operation of the electric rope reel (9) and the brake; when the pole is lowered, the control module controls the damping force generated by the brake to be smaller than the component force of the pull rope (10) in the horizontal direction; The rod lowering steps of the rod lowering mechanism are as follows: S1, the control module receives a mast lowering signal for emergency mast lowering triggered by human control or system; S2, the control module controls to immediately start the brake and the electric rope reel (9), the brake generates braking force, the electric rope reel (9) quickly and continuously reels the pull rope (10), drives the collector pole (5), the pitch arm (3), and the rotating seat (2) to rotate in the direction of the electric rope reel (9), and synchronously drives the collector pole (5) and the pitch arm (3) to pitch downward, the control module controls the force driving the rotation to be greater than the force of the brake to prevent the rotating seat from rotating, and the two together make the collector head move in the direction of the electric rope reel (9) in a controlled manner; S3, the collector head (6), the collector pole (5), and the pitch arm (3) move to the specified position, and the control module controls the stop brake and the electric rope reel (9) to complete the pole lowering.

2. The rod lowering mechanism for the automatic lifting collector of a trolleybus according to claim 1 is characterized in that: The brake comprises a brake shoe (7) and a brake disc (8); the brake shoe (7) is arranged on the base (1) or the rotating base (2); the brake disc (8) is arranged on the rotating base (2) or the base (1); the brake shoe (7) moves to rub against the brake disc (8) to achieve braking; the power source for the movement of the brake shoe (7) is an electromagnet or a stepping motor.

3. The rod lowering mechanism for the automatic lifting collector of a trolleybus according to claim 1 is characterized in that: The brake comprises a stepper motor and a toothed disc (15), the toothed disc (15) being provided with gear teeth, and the output shaft of the stepper motor being provided with a gear, the gear being meshed with the gear teeth on the toothed disc (15).

4. The rod lowering mechanism for the automatic lifting collector of a trolleybus according to claim 1 is characterized in that: The brake is a type of hydraulic damper, magnetic damper, or magnetic powder damper.

5. The rod lowering mechanism for the automatic lifting collector of a trolleybus according to any one of claims 1 to 4, characterized in that: An angle sensor is provided on the rotating seat (2), and the angle sensor is used to sense the current rotation angle of the rotating seat (2).

6. The rod lowering mechanism for the automatic lifting collector of a trolleybus according to any one of claims 1 to 3, characterized in that: The brake is provided with a protective cover (14).

7. The rod lowering mechanism for the automatic lifting collector of a trolleybus according to any one of claims 1 to 4, characterized in that: It also comprises a tail hook (11), which is arranged at the rear of the vehicle roof, and a positioning groove (12) is provided on the tail hook (11) for fixing the collector pole (5) at the closing position.

8. The rod lowering mechanism for the automatic lifting collector of a trolleybus according to claim 7 is characterized in that: A guide device (13) is also provided, the position of the guide device (13) being adapted to the position of the tail hook (11), and the pull rope (10) is connected to the collector pole (5) through the guide device (13).

9. The rod lowering mechanism for the automatic lifting collector of a trolleybus according to any one of claims 1 to 4, characterized in that: It also includes an elevation angle sensor, which is used to sense the current elevation angle of the pitch arm.

10. The rod lowering mechanism for the automatic lifting collector of a trolleybus according to any one of claims 1 to 4, characterized in that: The steps for triggering the emergency lowering command are as follows: S11, the control module continuously detects the voltage of the electrical connection of the collector; S12, determine the reduction amplitude of the collected voltage per unit time. If the voltage reduction amplitude is greater than the set threshold, it is considered that the collector is off the grid and an emergency pole lowering instruction is triggered. Otherwise, return to step S11 for continuous detection.

Images