Auxiliary braking device for walking mechanism of bucket wheel machine

Abstract

The invention discloses an auxiliary braking device for a walking mechanism of a bucket wheel machine. The auxiliary braking device comprises a machine shell. The step-up gear box is arranged in the machine shell, and the input end of the step-up gear box is connected with the shaft end of the bucket wheel machine driven wheel through a coupler; the generator is arranged in the machine shell and provided with a rotor and a stator, and a shaft of the rotor is connected with an output shaft of the step-up gear box through a coupler; and the energy storage battery is arranged in the machine shell, the energy storage battery is electrically connected with the output end of the generator, and the energy storage battery is electrically connected with the generator. An energy conversion mode is adopted, the step-up gear box is connected with the driven wheel shaft of the bucket wheel machine walking mechanism, and the generator is connected with the step-up gear box shaft, so that the step-up gear box can convert kinetic energy of the driven wheel into mechanical energy, the generator converts the mechanical energy of the step-up gear box into electric energy, and the electric energy is stored in the energy storage battery; mechanical friction is avoided, the braking attenuation degree is low, and the service life is long.

Description

Technical Field

[0001] The invention relates to the technical field of auxiliary braking, and in particular to an auxiliary braking device for a bucket wheel machine traveling mechanism. Background Art

[0002] Bucket wheel excavator is a large-scale open-pit mining and earthmoving equipment, mainly used for continuous excavation and transportation of large amounts of soil, coal, ore and other materials.

[0003] In order to transport materials over a wider range, bucket wheel cranes are equipped with traveling mechanisms that move on tracks, and they need to brake to stop after moving to the target area. At present, the braking of bucket wheel crane traveling mechanisms is usually completed by traditional brake mechanisms at the wheel ends, but bucket wheel cranes are large in size and heavy in weight, and the burden on the brake mechanisms is too heavy. In order to reduce the burden on the brake mechanisms, auxiliary braking devices are usually added, but traditional auxiliary braking devices also brake through mechanical action, and they still have problems such as overheating of heavy-load brakes and friction loss. The service life of the auxiliary braking devices is usually short, and they need regular maintenance and replacement.

[0004] Therefore, auxiliary brake devices that commonly use mechanical action often have brake attenuation problems such as overheating and wear, which leads to the need for frequent maintenance and replacement of auxiliary brake devices, and the auxiliary braking effect gradually decreases. Summary of the invention

[0005] The purpose of the present invention is to provide an auxiliary braking device for a bucket wheel excavator traveling mechanism, so as to solve the technical problems in the prior art that the auxiliary braking device often has brake attenuation problems such as overheating and wear due to mechanical action, resulting in the auxiliary braking device requiring frequent maintenance and replacement, and the auxiliary braking effect gradually decreasing.

[0006] In order to solve the above technical problems, the present invention specifically provides the following technical solutions: An auxiliary braking device for a bucket wheel machine travel mechanism, comprising: A casing, the casing being mounted outside the driven wheel of the bucket wheel machine; A speed-increasing gearbox is arranged in the casing, and an input end of the speed-increasing gearbox is connected to a shaft end of a driven wheel of a bucket wheel excavator through a coupling; A generator is arranged in the casing, the generator has a rotor and a stator, the rotor rotates inside the stator, and the shaft of the rotor is connected to the output shaft of the speed-increasing gearbox through a coupling, so as to convert mechanical energy into electrical energy; An energy storage battery is arranged in the housing, the energy storage battery is electrically connected to the output end of the generator, and is used to receive and store electric energy, and the energy storage battery is electrically connected to the generator, and is used to provide a starting current to the generator; When the bucket wheel excavator's traveling mechanism brakes, an excitation current is passed through the stator's excitation winding to form a magnetic field, and the rotor is rotated by the speed-increasing gearbox, causing the armature winding of the rotor to rotate in the stator's excitation winding to generate pulsed direct current, which is input into the energy storage battery for storage, so as to convert the kinetic energy of the bucket wheel excavator's driven wheel into electrical energy consumption, auxiliary braking, and store electrical energy.

[0007] As a preferred solution of the present invention, a speed sensor is arranged in the housing, and the speed sensor is arranged at the output end of the speed increasing gear box to detect the output speed of the speed increasing gear box; Wherein, the excitation current input to the generator changes dynamically with the output speed of the speed-increasing gearbox to stabilize the output voltage of the generator; When the output speed of the speed-increasing gearbox decreases, the excitation current input to the generator is increased, and when the speed-increasing gearbox stops rotating, the excitation current input to the generator is stopped.

[0008] As a preferred solution of the present invention, the energy storage battery is electrically connected to the speed sensor and the excitation winding of the stator to supply power to the speed sensor and the excitation winding of the stator respectively; Wherein, the energy storage battery dynamically adjusts the excitation current input to the generator according to the output speed of the speed-increasing gearbox.

[0009] As a preferred solution of the present invention, a plurality of battery modules and a control module are arranged in the energy storage battery, each of the battery modules is provided with a charge and discharge module, and the control module is electrically connected to the plurality of charge and discharge modules; The energy storage battery has an input end and an output end, the input end of the energy storage battery is electrically connected to the plurality of the charging and discharging modules and the armature winding of the rotor, and the output end of the energy storage battery is connected to the plurality of the charging and discharging modules and the excitation winding of the stator; Wherein, each of the charging and discharging circuits of the charging and discharging modules is provided with an independent control switch, and the control switch is electrically connected to the control module to control the charging and discharging status of the plurality of battery modules.

[0010] As a preferred solution of the present invention, the charging and discharging module has a charging circuit, a discharging circuit and a power supply bypass, the charging circuit and the discharging circuit are respectively connected to the input end and the output end of the battery module, and a plurality of the power supply bypasses are connected in parallel at the input end of the energy storage battery; Among them, the power supply bypass has the same control switch, and the power supply bypass is electrically connected to the speed sensor and the excitation winding of the stator, so that after the control switch turns on the power supply bypass, the pulsed direct current generated by the armature winding of the rotor is processed by the power supply bypass and then input into the excitation winding of the stator to establish a magnetic field.

[0011] As a preferred solution of the present invention, a plurality of the discharge circuits are connected in parallel at the output end of the energy storage battery, and the control module controls the number of the discharge circuits turned on and / or the number of the power supply bypasses turned on according to the output speed of the speed-increasing gearbox by controlling the plurality of control switches to meet the output voltage and current requirements of the output end of the energy storage battery; A plurality of charging circuits are connected in parallel at the input end of the energy storage battery.

[0012] As a preferred solution of the present invention, the control module includes a voltage regulator, which connects the input end of the energy storage battery and multiple discharge circuits and multiple power supply bypasses to accurately adjust the output voltage and current of the input end of the energy storage battery.

[0013] As a preferred solution of the present invention, the speed increasing gearbox comprises a box body, and a low speed shaft and a high speed shaft are respectively arranged on the two side walls of the box body, the low speed shaft is connected to the shaft end of the driven wheel of the bucket wheel through a coupling, and the high speed shaft is connected to the shaft of the rotor through a coupling; Among them, the end of the low-speed shaft located in the box body is provided with a large gear, the end of the high-speed shaft located in the box body is provided with a small gear, and the small gear and the large gear are directly or indirectly installed in cooperation with each other.

[0014] Compared with the prior art, the present invention has the following beneficial effects: The present invention adopts an energy conversion method. By setting a speed-increasing gearbox connected to the driven wheel shaft of the bucket wheel excavator's walking mechanism, and setting a generator connected to the speed-increasing gearbox shaft, the speed-increasing gearbox can convert the kinetic energy of the driven wheel into mechanical energy, and the generator converts the mechanical energy of the speed-increasing gearbox into electrical energy and stores it in an energy storage battery, so as to achieve a braking effect of converting kinetic energy into electrical energy, without mechanical friction, with low braking attenuation and long service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the implementation methods of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the implementation methods or the description of the prior art. Obviously, the drawings in the following description are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0016] Figure 1 A schematic diagram of the structure of an auxiliary braking device for a bucket wheel excavator traveling mechanism provided by an embodiment of the present invention; Figure 2 A schematic diagram of the internal structure of a casing of an auxiliary braking device for a bucket wheel excavator traveling mechanism provided by an embodiment of the present invention; Figure 3 A schematic diagram of the structure of a speed increasing gearbox of an auxiliary braking device for a bucket wheel excavator traveling mechanism provided by an embodiment of the present invention; Figure 4 A schematic diagram of the structure of a rotation speed sensor portion of an auxiliary braking device for a bucket wheel excavator traveling mechanism provided by an embodiment of the present invention; Figure 5 A schematic diagram of the structure of the generator portion of the auxiliary braking device for the bucket wheel excavator travel mechanism provided by an embodiment of the present invention; Figure 6 A block diagram of the energy storage battery circuit of the auxiliary braking device of the bucket wheel excavator walking mechanism provided in an embodiment of the present invention.

[0017] The numbers in the figure represent the following: 1- housing; 2- speed increasing gearbox; 3- generator; 4- energy storage battery; 5- speed sensor; 21-box; 22-low speed shaft; 23-high speed shaft; 31-rotor; 32-stator; 41-battery module; 42-control module; 221-large gear; 231-small gear; 411-charge and discharge module; 412-control switch; 413-charging circuit; 414-discharging circuit; 415-power supply bypass; 421-voltage regulator. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] like Figure 1 , Figure 2 , Figure 5 As shown, the present invention provides an auxiliary braking device for a bucket wheel machine traveling mechanism, comprising: Casing 1, casing 1 is mounted outside the driven wheel of the bucket wheel machine; The speed increasing gearbox 2 is arranged in the casing 1, and the input end of the speed increasing gearbox 2 is connected to the shaft end of the driven wheel of the bucket wheel machine through a coupling; The generator 3 is arranged in the housing 1. The generator 3 has a rotor 31 and a stator 32. The rotor 31 rotates inside the stator 32, and the shaft of the rotor 31 is connected to the output shaft of the speed-increasing gearbox 2 through a coupling, so as to convert mechanical energy into electrical energy. An energy storage battery 4 is disposed in the housing 1, and the energy storage battery 4 is electrically connected to the output end of the generator 3 for receiving and storing electric energy, and the energy storage battery 4 is electrically connected to the generator 3 for providing a starting current to the generator 3; When the bucket wheel excavator's traveling mechanism brakes, an excitation current is passed through the excitation winding of the stator 32 to form a magnetic field, and the rotor 31 is rotated by the speed increasing gearbox 2, so that the armature winding of the rotor 31 rotates in the excitation winding of the stator 32 to generate pulsed direct current and input it into the energy storage battery 4 for storage, so as to convert the kinetic energy of the driven wheel of the bucket wheel excavator into electrical energy consumption, auxiliary braking and storage of electrical energy.

[0020] The auxiliary braking device of the present invention mainly comprises a casing 1, a speed increasing gear box 2, a generator 3 and an energy storage battery 4 installed on the outside of the bucket wheel machine's traveling mechanism. The casing 1 protects the speed increasing gear box 2, the generator 3 and the energy storage battery 4. The speed increasing gear box 2 can convert the kinetic energy of the driven wheel of the bucket wheel machine into mechanical energy output, and the generator 3 can convert the mechanical energy output by the speed increasing gear box 2 into electrical energy to consume the kinetic energy of the driven wheel of the bucket wheel machine, thereby achieving the effect of auxiliary braking. In this process, the generator 3 transmits the electrical energy to the energy storage battery 4 for storage to provide starting current for the generator 3 to work again.

[0021] Among them, when the bucket wheel machine issues a braking command, the bucket wheel machine walking mechanism starts braking, and also issues a braking command to the auxiliary braking device. Then the energy storage battery 4 passes an excitation current to the excitation winding of the stator 32 of the generator 3 to form a magnetic field, and the generator 3 enters the working state.

[0022] Compared with the direct braking method of the bucket wheel excavator's traveling mechanism itself, the auxiliary braking device of the present invention adopts an energy conversion method to assist the braking of the bucket wheel excavator's traveling mechanism braking assembly. That is, during the braking process of the bucket wheel excavator's traveling mechanism, the generator 3 can be used to consume the mechanical energy of the driven wheel and convert it into electrical energy storage. During this process, there is no mechanical friction between the auxiliary braking device and the driven wheel, thereby avoiding friction loss, increasing service life, and the long-term braking effect has a low attenuation degree.

[0023] The energy storage battery 4 can use the stored electric energy to provide starting current for the generator 3 to work again, without the need for external energy supply, which is more energy-saving and has simple circuit layout.

[0024] When the bucket wheel excavator's traveling mechanism is braking, the rotation speed of the driven wheel of the bucket wheel excavator gradually decreases. In order to increase the power generation capacity, a speed increasing gearbox 2 is used to increase the rotation speed of the rotor 31. Based on this, the following preferred embodiments are provided.

[0025] Among them, Figure 3 As shown, the speed increasing gearbox 2 comprises a box body 21, and a low speed shaft 22 and a high speed shaft 23 are respectively arranged on the two side walls of the box body 21, the low speed shaft 22 is connected to the shaft end of the driven wheel of the bucket wheel through a coupling, and the high speed shaft 23 is connected to the shaft of the rotor 31 through a coupling; A large gear 221 is disposed at one end of the low-speed shaft 22 located in the housing 21 , and a small gear 231 is disposed at one end of the high-speed shaft 23 located in the housing 21 . The small gear 231 and the large gear 221 are directly or indirectly mounted in cooperation with each other.

[0026] Specifically, the low-speed shaft 22 and the high-speed shaft 23 of the housing 21 are provided with a large gear 221 and a small gear 231 respectively. After the large gear 221 and the small gear 231 cooperate, the low-speed shaft 22 is transmitted to the high-speed shaft 23 through the large gear 221 and the small gear 231, so that the high-speed shaft 23 rotates rapidly.

[0027] In the process of storing electric energy in the energy storage battery 4, it is necessary to ensure that the input voltage is stable as much as possible to protect the circuit system and the battery cell in the energy storage battery 4. However, the speed of the driven wheel of the bucket wheel machine changes during braking. After being transmitted to the generator 3 through the speed increasing gearbox 2, the speed of the rotor 31 of the generator 3 gradually decreases. If the excitation current remains unchanged, the output voltage decreases, making it difficult to charge the energy storage battery 4. Based on this, the following preferred embodiments are provided.

[0028] like Figure 4 As shown, a speed sensor 5 is provided in the housing 1, and the speed sensor 5 is provided at the output end of the speed increasing gearbox 2 to detect the output speed of the speed increasing gearbox 2; The excitation current input to the generator 3 changes dynamically with the output speed of the speed-increasing gearbox 2 to stabilize the output voltage of the generator 3; When the output speed of the speed-increasing gearbox 2 decreases, the excitation current input to the generator 3 is increased, and when the speed-increasing gearbox 2 stops rotating, the excitation current input to the generator 3 is stopped.

[0029] Specifically, a speed sensor 5 is provided to detect the output speed of the speed-increasing gearbox 2, so that when the speed-increasing gearbox 2 is decelerated, the output speed of the speed-increasing gearbox 2, that is, the speed of the rotor 31, is obtained, and the excitation current of the generator 3 is adjusted according to the amount of speed reduction, and the output voltage of the generator 3 is proportional to the product of the magnetic field strength and the rotor speed. Based on this, while keeping the output voltage relatively stable, when the rotor speed decreases, the magnetic field strength of the stator 32 should be increased, that is, the excitation current should be increased, and sequential control can ensure that the output voltage of the generator 3 is relatively stable.

[0030] During the braking process, the magnetic field strength of the stator 32 gradually increases, and the resistance torque of the rotor 31 increases, that is, as the driven wheel decelerates, the resistance of the rotor 31 increases, increasing the resistance of the driven wheel, thereby increasing the braking speed. When the output speed of the speed-increasing gearbox 2 is zero, that is, when the driven wheel stops braking, it is necessary to stop inputting the excitation current to the generator 3 in time to avoid damage to the generator 3 (the rotor 31 is difficult to drive the heavily loaded driven wheel to rotate, but the excitation current in the stator 32 generates a magnetic torque to drive the rotor 31 to rotate) In this embodiment, the speed sensor 5 can be a high-precision speed detection device such as a photoelectric encoder that can be coaxially installed on the output shaft of the speed-increasing gearbox 2.

[0031] Based on the above embodiments, the rotation speed sensor 5 and the excitation winding of the stator 32 both need to be powered. For this purpose, the following preferred embodiments are provided.

[0032] like Figure 1 , Figure 6 As shown, the energy storage battery 4 is electrically connected to the speed sensor 5 and the excitation winding of the stator 32 to supply power to the speed sensor 5 and the excitation winding of the stator 32 respectively; The energy storage battery 4 dynamically adjusts the excitation current input to the generator 3 according to the output speed of the speed increasing gearbox 2 .

[0033] Specifically, part of the output end of the energy storage battery 4 is connected to the rotation speed sensor 5 for the wheel speed sensor 5 to work, and most of it is output to the excitation winding of the stator 32 to establish a magnetic field in the generator 3 .

[0034] Of course, the characteristic of the battery cell is single charge and single discharge, that is, there is no situation of charging and discharging at the same time. Therefore, the energy storage battery 4 needs to be charged and discharged in coordination with the peripheral circuit to achieve the effect of simultaneous energy storage and discharge to maintain the magnetic field. Based on this, the following preferred embodiments are provided.

[0035] like Figure 6 As shown, a plurality of battery modules 41 and a control module 42 are provided in the energy storage battery 4, each battery module 41 is provided with a charge and discharge module 411, and the control module 42 is electrically connected to the plurality of charge and discharge modules 411; The energy storage battery 4 has an input end and an output end. The input end of the energy storage battery 4 is electrically connected to the multiple charging and discharging modules 411 and the armature winding of the rotor 31, and the output end of the energy storage battery 4 is connected to the multiple charging and discharging modules 411 and the excitation winding of the stator 32. Each charging and discharging circuit of each charging and discharging module 411 is equipped with an independent control switch 412 , and the control switch 412 is electrically connected to the control module 42 to control the charging and discharging states of the plurality of battery modules 41 .

[0036] Specifically, the energy storage battery 4 is composed of multiple battery modules 41 and a control module 42, and each battery module 41 is equipped with a charging and discharging module 411. The charging and discharging status of the multiple battery modules 41 can be controlled through the charging and discharging module 411. Therefore, according to the magnetic field strength requirement, a suitable number of battery modules 41 can be selected for discharge. For the battery modules 41 that do not need to be discharged, the electric energy generated by the generator 3 can be stored, and when the voltage of the discharged battery module 41 is too low, it can be switched in time to achieve the effect of simultaneous charging and discharging of the energy storage battery 4.

[0037] Of course, in the initial stage of deceleration braking, due to the high rotation speed of the driven wheel, the output speed of the speed increasing gearbox 2 is high, so that when the generator 3 outputs the rated voltage, the required magnetic field strength is small, that is, the required excitation current is small, and there is no need for multiple battery modules 41 to supply power. At this time, charging can be given priority to keep each battery module 41 at a high power level as much as possible, so as to jointly output and provide a larger excitation current in the latter stage of braking. Based on this, the following preferred embodiments are provided.

[0038] like Figure 6 As shown, the charge and discharge module 411 has a charging circuit 413, a discharging circuit 414 and a power supply bypass 415, the charging circuit 413 and the discharging circuit 414 are respectively connected to the input end and the output end of the battery module 41, and a plurality of power supply bypasses 415 are connected in parallel at the input end of the energy storage battery 4; Among them, the power supply bypass 415 has the same control switch 412, and the power supply bypass 415 is electrically connected to the speed sensor 5 and the excitation winding of the stator 32, so that after the control switch 412 turns on the power supply bypass 415, the pulsed direct current generated by the armature winding of the rotor 31 is processed by the power supply bypass 415 and input into the excitation winding of the stator 32 to establish a magnetic field.

[0039] Specifically, the charge and discharge module 411 is composed of a charging circuit 413, a discharging circuit 414 and a power supply bypass 415, and the charging circuit 413, the discharging circuit 414 and the power supply bypass 415 are all controlled by a control switch 412 and a control module 42 to control the disconnection. After receiving the speed feedback from the speed sensor 5, the control module 42 automatically controls the corresponding control switch 412 to disconnect according to the preset logic to enable the appropriate number of battery modules 41 to supply power. Specifically, if Figure 6 As shown, multiple discharge circuits 414 are connected in parallel at the output end of the energy storage battery 4. The control module 42 controls the number of discharge circuits 414 turned on and / or the number of power supply bypasses 415 turned on according to the output speed of the speed-increasing gearbox 2 by controlling multiple control switches 412 to meet the output voltage and current requirements of the output end of the energy storage battery 4. Multiple charging circuits 413 are connected in parallel at the input end of the energy storage battery 4.

[0040] And because the power supply bypass 415 can be controlled to be disconnected by the control switch 412, when the battery module 41 is at a high level and the stator 32 of the generator 3 does not need to input high current temporarily, it can be directly output through the power supply bypass 415 for use by the stator 32 of the generator 3.

[0041] Of course, when the energy storage battery 4 is outputting, the discharge circuit 414 and the power supply bypass 415 both stabilize the voltage and current to reduce voltage fluctuations and improve the stability of the output voltage and current. However, since it is necessary to ensure the stability of the output voltage of the generator 3, the energy storage battery 4 needs to transmit power to the generator 3 smoothly and needs to be smoothly adjusted according to the speed of the rotor 31. Based on this, the following preferred embodiments are provided.

[0042] like Figure 6 As shown, the control module 42 includes a voltage regulator 421 , which is connected to the input end of the energy storage battery 4 and multiple discharge circuits 414 and multiple power supply bypasses 415 to accurately adjust the output voltage and current of the input end of the energy storage battery 4 .

[0043] Specifically, the voltage regulator 421 is used to adjust the output voltage of the discharge circuit 414 and the power supply bypass 415 to make the output voltage and current of the energy storage battery 4 smoother to adapt to the smooth rotation speed of the rotor 31, thereby stabilizing the output voltage of the generator 3 and protecting the energy storage battery 4.

[0044] The above embodiments are only exemplary embodiments of the present application and are not intended to limit the present application. The protection scope of the present application is defined by the claims. Those skilled in the art may make various modifications or equivalent substitutions to the present application within the essence and protection scope of the present application, and such modifications or equivalent substitutions shall also be deemed to fall within the protection scope of the present application.

Claims

1. An auxiliary braking device for a bucket wheel excavator traveling mechanism, characterized in that: include: A casing (1), the casing (1) being mounted outside the driven wheel of the bucket wheel machine; A speed-increasing gearbox (2) is arranged in the casing (1), and an input end of the speed-increasing gearbox (2) is connected to a shaft end of a driven wheel of a bucket wheel machine via a coupling; A generator (3) is arranged in the casing (1), the generator (3) comprising a rotor (31) and a stator (32), the rotor (31) rotates inside the stator (32), and the shaft of the rotor (31) is connected to the output shaft of the speed-increasing gearbox (2) via a coupling, so as to convert mechanical energy into electrical energy; An energy storage battery (4) is arranged in the housing (1), the energy storage battery (4) is electrically connected to the output end of the generator (3) and is used to receive and store electrical energy, and the energy storage battery (4) is electrically connected to the generator (3) and is used to provide a starting current to the generator (3); When the bucket wheel machine travel mechanism brakes, an excitation current is passed through the excitation winding of the stator (32) to form a magnetic field, and the rotor (31) is rotated by the speed increasing gearbox (2), so that the armature winding of the rotor (31) rotates in the excitation winding of the stator (32) to generate pulsed direct current and input it into the energy storage battery (4) for storage, so as to convert the kinetic energy of the driven wheel of the bucket wheel machine into electric energy consumption to assist braking and store electric energy.

2. The auxiliary braking device of a bucket wheel excavator traveling mechanism according to claim 1, characterized in that: A rotation speed sensor (5) is arranged in the housing (1), and the rotation speed sensor (5) is arranged at the output end of the speed-increasing gearbox (2) to detect the output rotation speed of the speed-increasing gearbox (2); The excitation current input to the generator (3) changes dynamically with the output speed of the speed-increasing gearbox (2) to stabilize the output voltage of the generator (3); When the output speed of the speed-increasing gearbox (2) decreases, the excitation current input to the generator (3) is increased, and when the speed-increasing gearbox (2) stops rotating, the excitation current input to the generator (3) is stopped.

3. The auxiliary braking device of a bucket wheel excavator traveling mechanism according to claim 2, characterized in that: The energy storage battery (4) is electrically connected to the rotation speed sensor (5) and the excitation winding of the stator (32) so as to respectively supply power to the rotation speed sensor (5) and the excitation winding of the stator (32); The energy storage battery (4) dynamically adjusts the excitation current input to the generator (3) according to the output rotation speed of the speed-increasing gearbox (2).

4. The auxiliary braking device of a bucket wheel excavator traveling mechanism according to claim 3 is characterized in that: A plurality of battery modules (41) and a control module (42) are arranged in the energy storage battery (4); each of the battery modules (41) is provided with a charge and discharge module (411); and the control module (42) is electrically connected to the plurality of charge and discharge modules (411); The energy storage battery (4) has an input end and an output end, the input end of the energy storage battery (4) is electrically connected to the plurality of the charge and discharge modules (411) and the armature winding of the rotor (31), and the output end of the energy storage battery (4) is connected to the plurality of the charge and discharge modules (411) and the excitation winding of the stator (32); The charging circuit and the discharging circuit of each of the charging and discharging modules (411) are each provided with an independent control switch (412), and the control switch (412) is electrically connected to the control module (42) to control the charging and discharging state of the plurality of battery modules (41).

5. The auxiliary braking device for a bucket wheel excavator travel mechanism according to claim 4, characterized in that: The charging and discharging module (411) comprises a charging circuit (413), a discharging circuit (414) and a power supply bypass (415); the charging circuit (413) and the discharging circuit (414) are respectively connected to the input end and the output end of the battery module (41); a plurality of the power supply bypasses (415) are connected in parallel at the input end of the energy storage battery (4); The power supply bypass (415) is provided with the same control switch (412), and the power supply bypass (415) is electrically connected to the rotation speed sensor (5) and the excitation winding of the stator (32), so that after the control switch (412) turns on the power supply bypass (415), the pulsed direct current generated by the armature winding of the rotor (31) is processed by the power supply bypass (415) and then input into the excitation winding of the stator (32) to establish a magnetic field.

6. The auxiliary braking device for a bucket wheel excavator travel mechanism according to claim 5, characterized in that: A plurality of the discharge circuits (414) are connected in parallel at the output end of the energy storage battery (4); the control module (42) controls the number of the discharge circuits (414) that are turned on and / or the number of the power supply bypasses (415) that are turned on according to the output speed of the speed-increasing gearbox (2) by controlling the plurality of control switches (412) to meet the output voltage and current requirements of the output end of the energy storage battery (4); A plurality of charging circuits (413) are connected in parallel at the input end of the energy storage battery (4).

7. The auxiliary braking device of a bucket wheel excavator traveling mechanism according to claim 6, characterized in that: The control module (42) comprises a voltage regulator (421), wherein the voltage regulator (421) is connected to the input end of the energy storage battery (4) and the plurality of discharge circuits (414) and the plurality of power supply bypasses (415) to accurately regulate the output voltage and current of the input end of the energy storage battery (4).

8. The auxiliary braking device for a bucket wheel excavator travel mechanism according to any one of claims 1 to 7, characterized in that: The speed increasing gearbox (2) comprises a box body (21), and a low speed shaft (22) and a high speed shaft (23) are respectively arranged on two side walls of the box body (21), the low speed shaft (22) is connected to the shaft end of the driven wheel of the bucket wheel machine through a coupling, and the high speed shaft (23) is connected to the shaft of the rotor (31) through a coupling; A large gear (221) is disposed at one end of the low-speed shaft (22) located in the housing (21), a small gear (231) is disposed at one end of the high-speed shaft (23) located in the housing (21), and the small gear (231) and the large gear (221) are directly or indirectly mounted in cooperation with each other.

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