A material conveyor belt shutdown energy recovery system

Abstract

This utility model provides an energy recovery system for a conveyor belt conveyor during shutdown, belonging to the field of conveyor belt energy recovery technology. It solves the problem of energy waste caused by the brakes or damping devices consuming energy when the conveyor belt stops. The system includes an energy recovery device and a conveyor belt motor connected in parallel to the power supply busbar of the conveyor belt conveyor. A busbar voltage transformer for detecting the busbar voltage is installed on the power supply busbar, and the busbar voltage transformer is connected to the energy recovery device via a wire. The energy recovery device is also connected to the controller of the conveyor belt motor via a wire to collect the start / stop status signals of the conveyor belt motor. The energy recovery device includes a control circuit board and an energy recovery module. The control circuit board integrates a microcontroller, and the energy recovery module includes an energy recovery medium, a recovery circuit, and switching elements. This utility model is applied to conveyor belt conveyors.

Description

Technical Field

[0001] This utility model provides an energy recovery system for a material conveyor belt during shutdown, belonging to the field of belt conveyor energy recovery technology. Background Technology

[0002] Energy conservation and carbon reduction have become increasingly important requirements in production across various industries. Conveyor belts for material conveying are widely used in industrial and mining enterprises. Due to the large mass of materials they carry, conveyor belts (especially downhill conveyor belts) exhibit significant inertia when they stop. For safety reasons, brakes or damping devices must be installed to dissipate the kinetic energy during stopping and assist in a normal shutdown. This kinetic energy is actually converted into frictional heat during the stopping phase and is thus wasted.

[0003] Therefore, this utility model specifically proposes an energy recovery device for stopping a conveyor belt. Utility Model Content

[0004] To address the problem of energy waste caused by the consumption of energy by brakes or damping devices when existing conveyor belts stop, this invention proposes a conveyor belt stopping energy recovery system. The aim is to improve the hardware of the conveyor belt so that its kinetic energy can be converted into electrical energy and stored when the conveyor belt stops, and released when it starts up, saving the energy required for starting up. Ultimately, this achieves the recovery and utilization of energy when the conveyor belt stops, thus achieving the goal of energy conservation and emission reduction.

[0005] The technical solution adopted by this utility model is as follows: a power recovery system for stopping a conveyor belt, including an energy recovery device and a conveyor belt motor connected in parallel to the power supply bus of the conveyor belt. A bus voltage transformer for detecting the voltage of the power supply bus is installed on the power supply bus. The bus voltage transformer is connected to the energy recovery device through a wire. The energy recovery device is also connected to the controller of the conveyor belt motor through a wire to collect the start and stop status signals of the conveyor belt motor. The conveyor belt motor is connected to the load.

[0006] The energy recovery device includes a control circuit board and an energy recovery module. The control circuit board integrates a microcontroller, and the energy recovery module includes an energy recovery medium, a recovery circuit, and a switching element. The microcontroller is connected to the bus voltage transformer, the controller of the conveyor belt motor, and the switching element via wires.

[0007] Furthermore, the energy recovery medium can be a flywheel assembly, a supercapacitor assembly, or a lithium / sodium-ion battery assembly.

[0008] Furthermore, the recovery circuit includes a pre-charge / discharge circuit and a bidirectional converter. The pre-charge / discharge circuit is connected in parallel to the bidirectional converter, and the energy recovery medium is connected to the power supply bus through the bidirectional converter.

[0009] Furthermore, the precharge / discharge circuit includes a precharge resistor and a precharge switch connected in series.

[0010] Furthermore, the switching elements include a main switch, a first circuit breaker, and a second circuit breaker. The energy recovery medium is connected in series with a fuse and the main switch, and then in parallel with the first circuit breaker and a pre-charge resistor. The other end of the first circuit breaker is connected in series with a bidirectional converter, and then in parallel with a pre-charge switch and the second circuit breaker. The other end of the second circuit breaker is connected to the power supply bus.

[0011] Furthermore, when lithium / sodium-ion battery packs are used as the energy recovery medium, the microcontroller is also connected to a smoke detector, temperature sensor, gas detector and voltage and current detector via wires. The microcontroller is wired and / or wirelessly connected to the fire alarm control panel, and the fire alarm control panel is linked with the fire-fighting equipment.

[0012] Furthermore, the temperature sensor is installed on the surface of the lithium / sodium ion battery pack or inside the battery box.

[0013] Furthermore, the gas detectors include carbon monoxide detectors and hydrogen detectors.

[0014] The advantages of this utility model over the prior art are as follows:

[0015] (1) This utility model utilizes lithium / sodium ion batteries, supercapacitors, or flywheels to recover energy when the conveyor belt stops. It can convert the kinetic energy of the conveyor belt into electrical energy for storage when it stops, and release the electrical energy when it starts, saving the energy required for starting. Ultimately, it realizes the recovery and utilization of energy when the conveyor belt stops, achieving the purpose of energy saving and emission reduction. At the same time, after adopting this device, the braking equipment of the conveyor belt can be eliminated, reducing the mechanical wear of the belt conveyor.

[0016] (2) This utility model fully considers the characteristics of belt conveyors and lithium / sodium ion batteries or supercapacitors or flywheel energy storage devices. This application scenario can give full play to the characteristics of high power density and low energy density of lithium / sodium ion batteries or supercapacitors or flywheel energy storage devices, and has strong applicability.

[0017] (3) The main idea of ​​this utility model is to draw on the energy recovery technology that has been applied in the fields of rail transit, etc. The technology is reliable and highly targeted, and it is expected to achieve significant effects of energy saving, emission reduction and equipment efficiency improvement in practice. Attached Figure Description

[0018] The present invention will be further described below with reference to the accompanying drawings:

[0019] Figure 1 A framework diagram of a material conveyor belt shutdown energy recovery system provided for an embodiment of this utility model (taking low voltage 380V as an example).

[0020] Figure 2 A circuit diagram illustrating energy recovery using a supercapacitor is provided for an embodiment of this utility model.

[0021] Figure 3 The circuit diagram provided for an embodiment of this utility model shows the energy recovery achieved using a lithium-sodium ion battery or a flywheel device;

[0022] In the diagram: 1 is the energy recovery device, 2 is the pre-charge / discharge circuit, 3 is the bidirectional converter, 4 is the bus voltage transformer, and 5 is the conveyor belt motor. Detailed Implementation

[0023] like Figures 1 to 3 As shown, this utility model provides an energy recovery system for a conveyor belt conveyor during shutdown, including an energy recovery device 1 and a conveyor belt motor 5. The basic idea of ​​this utility model is to configure an energy recovery device 1 at the power supply bus of a high-power conveyor belt conveyor, while eliminating the brake or damper on the conveyor belt conveyor. Specifically, the energy recovery device 1 and the conveyor belt motor 5 are connected to the power supply bus. A bus voltage transformer 4, which can monitor the voltage of the power supply bus, is connected to the energy recovery device 1. The energy recovery device 1 is also connected to the controller of the conveyor belt motor 5 to monitor the start and stop status of the conveyor belt motor 5. Based on the start and stop status of the conveyor belt motor 5, the energy recovery device 1 is started or stopped.

[0024] Energy recovery device 1 includes a control circuit board and an energy recovery module. The control circuit board integrates a microcontroller. The energy recovery module includes an energy recovery medium, a recovery circuit, and switching elements. The microcontroller is connected to the bus voltage transformer, the controller of the conveyor belt motor, and the switching elements via wires. The recovery circuit includes a pre-charge / discharge circuit and a bidirectional converter. The pre-charge / discharge circuit is connected in parallel to the bidirectional converter. The energy recovery medium is connected to the power supply bus via the bidirectional converter. Pre-charge / discharge circuit 2 includes a pre-charge resistor and a pre-charge switch. The switching elements include a main switch, a first circuit breaker, and a second circuit breaker. The energy recovery medium is connected in series with a fuse and the main switch, then in parallel with the first circuit breaker and the pre-charge resistor. The other end of the first circuit breaker is connected in series with the bidirectional converter, then in parallel with the pre-charge switch and the second circuit breaker. The other end of the second circuit breaker is connected to the power supply bus.

[0025] The principle of this invention is as follows: When the conveyor belt decelerates and stops, it is no longer braked. Therefore, the kinetic energy generated by the material carried on the belt due to inertia (gravity) acts on the conveyor belt (asynchronous motor), driving it to perform short-term power generation, thus converting kinetic energy into electrical energy. The asynchronous motor then generates electricity, releasing it back onto the power supply bus, causing a voltage rise. Upon receiving the conveyor belt braking signal and monitoring the rise in the power supply bus voltage, the energy recovery device 1 activates. After activation, the energy recovery device 1 absorbs electrical energy from the conveyor belt's power supply bus, smoothing out the voltage fluctuations. This achieves the effect of recovering the conveyor belt's braking energy.

[0026] When the conveyor belt starts, the voltage level of its power supply bus drops due to the input of a high-power load. At this time, the energy recovery device 1 receives the belt belt start signal synchronously and, after monitoring the drop in the power supply bus voltage level, starts accordingly. After starting, the energy recovery device 1 releases electrical energy to the belt belt power supply bus to smooth out the voltage change. This achieves the effect of saving energy when starting the belt belt.

[0027] This application provides three types of energy recovery devices 1, namely, an energy recovery device using a supercapacitor group, an energy recovery device using a flywheel group, and an energy recovery device using a lithium / sodium ion battery. The three types of energy recovery devices 1 are described below.

[0028] Example 1

[0029] Energy recovery device using supercapacitor banks: Supercapacitors are a new type of energy storage device with high current charging and discharging capabilities, falling between traditional capacitors and secondary batteries. They feature fast charging and discharging speeds, high power density, low energy density, long lifespan, high reliability, and environmental friendliness, making them highly suitable for applications such as stopping and braking conveyor belts (where braking power is relatively high but total energy is relatively low). Currently, supercapacitors are widely used as power devices or energy storage devices in fields such as rail transportation (e.g., train braking energy recovery) and the military (e.g., electromagnetic railguns), and a considerable number of companies both domestically and internationally are engaged in the design, research and development, and manufacturing of this product. Therefore, there are no significant obstacles in the technology, manufacturing, and application fields for energy recovery devices using supercapacitors as the main medium, providing a practical feasibility for the implementation of this embodiment.

[0030] like Figure 2 As shown, the energy recovery device 1, which uses a supercapacitor bank as the main medium, includes a supercapacitor bank, a pre-charge / discharge circuit 2, and a bidirectional converter (PCS) 3. The supercapacitor bank is connected to the power supply bus through the bidirectional converter 3, and the pre-charge / discharge circuit 2 is connected in parallel on the bidirectional converter 3. Necessary switches, fuses, circuit breakers, etc. are installed, and the belt conveyor eliminates the brake or damper.

[0031] Example 2

[0032] An energy recovery device employing a flywheel assembly: The flywheel stores energy through a high-speed rotating rotor, featuring high power density, fast response speed, long cycle life, environmental friendliness, and maintenance-free operation. It is finding increasingly widespread application in new power systems and the power auxiliary service market, perfectly matching the application scenario of material conveyor belt braking (high braking power, low total energy). Currently, flywheels are widely used as power devices or energy storage devices in rail transportation (such as train braking energy recovery) and military applications (such as electromagnetic railguns), with a considerable number of companies both domestically and internationally engaged in the design, research and development, and manufacturing of such products. Therefore, there are no significant obstacles in the technology, manufacturing, and application fields for an energy recovery device using a flywheel as the primary medium, providing practical feasibility for the implementation of this embodiment.

[0033] like Figure 3 As shown, the energy storage and recovery device 1, which uses a flywheel assembly as the main medium, includes a flywheel assembly, a generator / motor, a rectifier, etc., and also includes a pre-charge / discharge circuit 2 and a bidirectional converter (PCS) 3. The flywheel assembly is connected to the power supply bus through the bidirectional converter 3, and the pre-charge / discharge circuit 2 is connected in parallel on the bidirectional converter 3. Necessary switches, fuses, circuit breakers, etc. are also provided. Meanwhile, the belt conveyor eliminates the brake or damper.

[0034] Example 3

[0035] Energy recovery device using lithium / sodium-ion batteries: Lithium / sodium-ion batteries are among the most mature and commercially available energy storage batteries, characterized by high power density, high energy density, small size, small footprint, low self-discharge rate, and fast response speed. They are increasingly widely used in new power systems and power ancillary services markets, perfectly matching the application scenario of material conveyor belt braking (frequent operations, compact footprint, etc.). Currently, lithium / sodium-ion batteries are widely used as power devices or energy storage devices in various energy storage applications both domestically and internationally, with numerous companies engaged in the design, research and development, and manufacturing of these products. Therefore, energy recovery devices using lithium / sodium-ion batteries as the primary medium are technologically mature, well-manufactured, and applicable, providing a practical feasibility for the implementation of this embodiment.

[0036] The energy storage and recovery device 1, using lithium / sodium-ion batteries as the main medium, includes a lithium / sodium-ion battery pack, a pre-charge / discharge circuit 2, and a bidirectional converter (PCS) 3. The lithium / sodium-ion battery pack is connected to the power supply bus via the bidirectional converter 3, and the pre-charge / discharge circuit 2 is connected in parallel to the bidirectional converter 3. Necessary switches, fuses, circuit breakers, etc., are installed, and the belt conveyor eliminates the need for brakes or dampers. The lithium / sodium-ion battery pack includes a lithium / sodium-ion battery device, a generator / motor, a rectifier, etc.

[0037] The energy recovery device of this utility model, implemented using the above three embodiments, has its parameter selection mainly determined through the following steps:

[0038] (1) Determine the characteristic parameters and electrical wiring of the high-power conveyor belt.

[0039] (2) Calculate the kinetic energy of the material when the high-power conveyor belt is stopped, based on the determined characteristic parameters of the high-power conveyor belt.

[0040] The kinetic energy of the material present when the belt conveyor stops is W. D =W S -W R =mgΔh-εW S (Potential energy minus frictional heat energy), where W S W represents the potential energy of the material. R The frictional heat energy is denoted as m, where m is the mass of the belt conveyor when fully loaded (in kg); g is the gravitational acceleration at the installation location (in N / kg); Δh is the relative height difference during belt transport (in m); and ε is the friction energy dissipation coefficient, which needs to be determined comprehensively based on the material and the belt itself. Generally, ε should be between 0.4 and 0.8.

[0041] (3) Calculate the braking power required when the high-power conveyor belt is stopped based on the determined characteristic parameters of the high-power conveyor belt.

[0042] According to the empirical formula for motor braking capacity, the braking power P of the belt conveyor stopping brake is... z =M max t / 9549;

[0043] Among them, P z This is the maximum braking torque of the motor, in m / s. 2 t is the braking time, in seconds.

[0044] (4) Based on the material kinetic energy and braking power of the high-power conveyor belt when it stops, as determined in (2) and (3), determine the amount of electricity and power required for the energy storage and recovery device.

[0045] Among them, the electricity required by the energy storage and energy recovery device is W c =k wW D ;

[0046] Where k w The reliability coefficient is typically taken as 1 to 1.2.

[0047] The power required for the energy storage and recovery device is P. c =k p P z ;

[0048] Where k p The reliability factor is typically taken as 1.5 to 2.

[0049] (5) After determining the required amount of electricity and power of the energy recovery device, match the corresponding supercapacitor group or flywheel device or lithium / sodium ion battery, PCS (bidirectional rectifier), switching element, etc. to realize bidirectional energy exchange between the power supply bus and the energy recovery device 1.

[0050] (6) Combine supercapacitors or flywheel devices or lithium / sodium ion batteries, PCS, etc. to form an energy recovery device 1, and connect it in parallel to the power supply bus of the conveyor belt.

[0051] (7) The energy recovery device should be able to receive the start and stop signals of the belt conveyor synchronously and monitor the voltage of the power supply bus.

[0052] (8) When using lithium / sodium ion batteries, necessary detection alarms and fire-fighting equipment should be configured.

[0053] It is important to note that the application scenario must be considered when using this invention. Ideally, it should be applied to conveyor belts with high speeds, heavy loads, and a downward conveyor system, as this maximizes the energy recovery and makes energy recovery economically viable. Otherwise, if the recoverable energy is too low, the necessity of using a recovery device should be carefully considered.

[0054] Regarding the specific structure of this utility model, it should be noted that the connection relationships between the various component modules adopted in this utility model are definite and achievable. Except as specifically described in the embodiments, their specific connection relationships can bring about corresponding technical effects and solve the technical problems proposed by this utility model without relying on the execution of corresponding software programs. The models of the components, modules, and specific components appearing in this utility model, the connection methods between them, and the conventional usage methods and expected technical effects brought about by the above-mentioned technical features, unless specifically described, are all publicly disclosed content in patents, journal articles, technical manuals, technical dictionaries, and textbooks that can be obtained by those skilled in the art before the application date, or belong to conventional technology, common knowledge, and other existing technologies in this field. There is no need to elaborate, which makes the technical solution provided in this case clear, complete, and achievable, and can reproduce or obtain corresponding physical products based on this technical means.

[0055] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A material conveyor belt conveyor shutdown energy recovery system, characterized in that: It includes an energy recovery device and a conveyor belt motor connected in parallel to the power supply bus of the conveyor belt. A bus voltage transformer for detecting the voltage of the power supply bus is installed on the power supply bus. The bus voltage transformer is connected to the energy recovery device through a wire. The energy recovery device is also connected to the controller of the conveyor belt motor through a wire to collect the start and stop status signals of the conveyor belt motor. The conveyor belt motor is connected to the load. The energy recovery device includes a control circuit board and an energy recovery module. The control circuit board integrates a microcontroller, and the energy recovery module includes an energy recovery medium, a recovery circuit, and a switching element. The microcontroller is connected to the bus voltage transformer, the controller of the conveyor belt motor, and the switching element via wires.

2. The energy recovery system for a conveyor belt during shutdown according to claim 1, characterized in that: The energy recovery medium can be a flywheel assembly, a supercapacitor assembly, or a lithium / sodium-ion battery assembly.

3. The energy recovery system for a conveyor belt during shutdown according to claim 2, characterized in that: The energy recovery circuit includes a pre-charge / discharge circuit and a bidirectional converter. The pre-charge / discharge circuit is connected in parallel to the bidirectional converter, and the energy recovery medium is connected to the power supply bus through the bidirectional converter.

4. The energy recovery system for a conveyor belt during shutdown according to claim 3, characterized in that: The precharge / discharge circuit includes a precharge resistor and a precharge switch connected in series.

5. The energy recovery system for a conveyor belt conveyor shutdown according to claim 4, characterized in that: The switching elements include a main switch, a first circuit breaker, and a second circuit breaker. The energy recovery medium is connected in series with a fuse and the main switch, and then in parallel with the first circuit breaker and a pre-charge resistor. The other end of the first circuit breaker is connected in series with a bidirectional converter, and then in parallel with a pre-charge switch and the second circuit breaker. The other end of the second circuit breaker is connected to the power supply bus.

6. The energy recovery system for a conveyor belt conveyor shutdown according to claim 2, characterized in that: When lithium / sodium-ion battery packs are used as the energy recovery medium, the microcontroller is also connected to a smoke detector, temperature sensor, gas detector and voltage and current detector via wires. The microcontroller is wired and / or wirelessly connected to the fire alarm control panel, and the fire alarm control panel is linked with the fire-fighting equipment.

7. The energy recovery system for a conveyor belt during shutdown according to claim 6, characterized in that: Temperature sensors are installed on the surface of lithium / sodium-ion battery packs or inside the battery housing.

8. The energy recovery system for a conveyor belt during shutdown according to claim 6, characterized in that: Gas detectors include carbon monoxide detectors and hydrogen detectors.

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