A hoisting mechanism electric motor braking energy recovery and utilization system

Abstract

The present invention relates to a system for recovering and utilizing braking energy of a hoisting mechanism motor in the technical field of motor energy recovery, which includes a drum, a hoisting motor for controlling the rotation of the drum, a brake for controlling the braking of the drum, and a braking resistor connected to the discharge circuit of the hoisting motor; above the brake, there is an oil filling device for adding lubricating oil to the brake pads of the brake, and the braking resistor transfers heat to the oil filling device; this system for recovering and utilizing braking energy of the motor can directly reuse the braking energy with low cost and high efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of motor energy recovery, and more particularly to a system for recovering and utilizing the braking energy of a hoisting mechanism motor. Background Art

[0002] As is well known, during the process of lifting and lowering heavy objects by a crane hoisting mechanism, there are two types of energy that can be recovered. One is the frictional energy during brake braking. When this energy is used frequently, it will cause damage to the friction components and a decline in braking performance. Since it is difficult to recover this energy, it is necessary to regularly check and maintain, and timely replenish lubricating oil to reduce friction, reduce wear, prevent corrosion and overheating. Especially in cold weather in the north in winter, it is more necessary to ensure a stable and safe braking process. The other is the generating energy when the hoisting motor is in the generating state during the lowering of heavy objects. This generating energy cannot be consumed by itself. If left unattended, it will affect the life of the motor. Therefore, it is generally solved by means such as dissipation, storage and utilization. Dissipation is to connect a load, generally a braking resistor, in series with the generating circuit of the motor, and the energy is consumed by the heat generated by the braking resistor. The disadvantage is that the natural heat dissipation is slow, it is not easy to last for a long time, and it wastes energy. Storage is to connect a storage battery to collect electric energy. As shown in the Chinese utility model patent with the publication number CN203294993U, the stored electric energy can also be fed back to the motor to lift heavy objects, so as to achieve the purpose of energy saving through reuse. The disadvantage is that an additional energy storage and feedback device needs to be equipped, which increases the cost, and the energy utilization rate will also be reduced after energy storage conversion. Summary of the Invention

[0003] In order to overcome the deficiencies in the background art and solve the existing technical problems, the present invention discloses a system for recovering and utilizing the braking energy of a hoisting mechanism motor, which can directly reuse the braking energy at low cost and high efficiency.

[0004] To achieve the above object, the present invention adopts the following technical solutions:

[0005] A system for recovering and utilizing the braking energy of a hoisting mechanism motor includes a drum, a hoisting motor for controlling the rotation of the drum, a brake for controlling the braking of the drum, and a braking resistor connected to the discharging circuit of the hoisting motor; above the brake, there is an oil filling device for adding lubricating oil to the brake pads of the brake, and the braking resistor transfers heat to the oil filling device.

[0006] Further, the oil filling device includes an oil storage bottle and an oil outlet nozzle connected to the bottom of the oil storage bottle, and the braking resistor is arranged in a long strip shape and wound around the oil storage bottle and the oil outlet nozzle.

[0007] Further, an oil outlet channel communicating with the oil storage bottle at the upper end is provided in the center of the oil nozzle, a sponge body is blocked in the oil outlet channel, and the sponge body abuts against a shape memory alloy that expands when heated.

[0008] Further, the oil nozzle includes a heat-conducting cylinder having a cylindrical cavity. The upper end of the heat-conducting cylinder is closed to form an upper hole section communicating with the oil storage bottle, and a bottom cover is fixedly provided at the lower end of the heat-conducting cylinder. A convex column corresponding to being inserted into the cylindrical cavity is provided in the center of the inner cover surface of the bottom cover. The sponge body naturally seals between the lower port of the upper hole section and the upper end surface of the convex column. A groove is provided in the center of the upper end surface of the convex column, and a pressing block is slidably fitted in the groove. The shape memory alloy is in the shape of a spring and abuts against the bottom of the groove and the pressing block at both ends respectively. A gap is left between the outer wall of the convex column and the inner wall of the cylindrical cavity, and a lower hole section communicating the gap with the outer cover surface of the bottom cover is provided in the bottom cover.

[0009] Further, a support column is fixedly provided in the center of the bottom surface of the pressing block, and when the lower end of the support column abuts against the bottom of the groove, the top surface of the pressing block is flush with the upper end surface of the convex column, and the shape memory alloy is sleeved outside the support column.

[0010] Further, the gap is an annular gap, and a plurality of lower hole sections are uniformly arranged in a ring along the annular gap, and the lower ends of the plurality of lower hole sections converge and communicate.

[0011] Further, the braking resistor includes a series-connected low-resistance section and high-resistance section, and is respectively wound around the outer wall of the oil storage bottle and embedded in the oil nozzle.

[0012] Further, the shape memory alloy is made of nickel-titanium alloy.

[0013] Further, a heat-insulating layer is provided outside the oil nozzle.

[0014] Further, a storage battery is connected in parallel to the fueling device, and a relay and a normally open contact switch of the relay are respectively connected in series to the fueling device and the storage battery.

[0015] Due to the adoption of the above technical solutions, the present invention has the following beneficial effects:

[0016] The braking energy recovery and utilization system for the hoisting mechanism motor disclosed by the present invention directly heats the fueling device arranged above the brake through the braking resistor, that is, it can increase the heat dissipation of the braking resistor by using the heat transfer of the lubricating oil, so that the braking resistor can work more continuously under high load, and it can also make the lubricating oil maintain good fluidity and lubrication effect when the hoisting mechanism is used in the north, especially in winter. Thus, while reducing costs, it can directly save and utilize energy.

[0017] In addition, when the fueling device is designed to extrude the sponge body to discharge oil through the shape memory alloy when heated, it can not only achieve automatic fueling, but also establish a connection between the frequency of lifting and braking of the lifting mechanism and the lubricating oil addition and maintenance frequency, realizing intelligent fueling. Brief Description of the Drawings

[0018] Figure 1 is a schematic structural diagram of an embodiment of the present invention;

[0019] Figure 2 is a schematic structural diagram of the fueling device;

[0020] Figure 3 is an enlarged cross-sectional schematic structural view of the oil outlet nozzle.

[0021] In the figure: 1, drum; 2, hoisting motor; 3, brake; 4, oil storage bottle; 5, braking resistor; 6, oil outlet nozzle; 601, heat conduction cylinder; 602, cylinder cavity; 603, convex column; 604, lower hole section; 605, bottom cover; 606, groove; 607, shape memory alloy; 608, support column; 609, pressing block; 610, sponge body; 611, upper hole section; 7, relay; 8, normally open contact switch; 9, storage battery. Detailed Embodiments

[0022] Next, the technical solutions of the present invention will be described in conjunction with the drawings in the embodiments of the present invention. In the description, it should be understood that if there are terms such as "upper", "lower", "front", "rear", "left", "right", etc. indicating the orientation or positional relationship, they are only corresponding to the drawings of the present invention for the convenience of describing the present invention, rather than indicating or implying that the device or element referred to must have a specific orientation: Embodiment 1:

[0023] Combined with the Figure 1-2 shown hoisting mechanism motor braking energy recovery and utilization system, a drum 1, a hoisting motor 2 for controlling the rotation of the drum 1, a brake 3 for controlling the braking of the drum 1, and a braking resistor 5 connected to the discharge circuit of the hoisting motor 2; above the brake 3, there is a fueling device for adding lubricating oil to the brake pads of the brake 3. This fueling device can use existing automatic or manual oil injection devices. The braking resistor 5 transfers heat to this fueling device, generally by contact conduction; as needed, the fueling device includes an oil storage bottle 4 and an oil outlet nozzle 6 connected to the bottom of the oil storage bottle 4. This is the general structure of the fueling device. The braking resistor 5 is set as a long strip shape and wound around the oil storage bottle 4 and the oil outlet nozzle 6. After changing the shape of the braking resistor 5, the heat transfer effect can be better;

[0024] As needed, an oil outlet channel communicating with the oil storage bottle 4 at the upper end is provided in the center of the oil nozzle 6. A sponge body 610 is blocked in the oil outlet channel. The sponge body 610 abuts against a shape memory alloy 607 that expands when heated. Specifically, the shape memory alloy 607 can be made of nickel-titanium alloy. When the temperature of the lubricating oil is low, its fluidity is poor. Even if it can penetrate into the sponge body 610 through the oil outlet channel, the adhesion of the lubricating oil will increase due to the structure of the sponge body 610, achieving a sealing effect. Generally, no or very few oil droplets will be discharged. Once the lifting mechanism is used frequently, the brake pads of the brake 3 will experience severe friction, and the braking resistor 5 will also continuously generate heat, which can cause the shape memory alloy 607 to expand when heated, squeezing the sponge body 610, thereby increasing the discharge amount of the lubricating oil and reducing the wear of the brake pads, thus achieving a linkage effect. In addition, the braking resistor 5 includes a series-connected low-resistance section and a high-resistance section, which are respectively wound around the outer wall of the oil storage bottle 4 and embedded in the oil nozzle 6. A heat-insulating layer is provided outside the oil nozzle 6. While maintaining the operating temperature of the lubricating oil in the oil storage bottle 4, more heat can be concentrated at the narrow and easily blocked oil outlet channel of the oil nozzle 6 and the shape memory alloy 607.

[0025] When implementing the electric motor braking energy recovery and utilization system of the lifting mechanism of the present invention, when the lifting mechanism performs lifting and braking operations, the feedback energy of the lifting motor 2 is transmitted to the braking resistor 5, causing the braking resistor 5 to generate heat, and the heat is then transmitted to the refueling device, thereby improving the fluidity and lubrication effect of the lubricating oil in the refueling device in low-temperature weather and ensuring the good operation of the brake 3 during frequent use. Embodiment 2:

[0026] Although the brake can be maintained by adding lubricating oil, during the process of frequent use, it cannot be continuously added. Continuous addition will reduce the braking effect and is prone to waste. Therefore, in combination with the attached Figure 3As shown, the difference from the first embodiment is that the oil nozzle 6 is provided with a heat-conducting cylinder 601 having a cylinder cavity 602. The upper end of the heat-conducting cylinder 601 is closed to form an upper hole section 611 communicating with the oil storage bottle 4. The lower end of the heat-conducting cylinder 601 is covered and fixed with a bottom cover 605. In the center of the inner cover surface of the bottom cover 605, a convex column 603 corresponding to being inserted into the cylinder cavity 602 is provided. The sponge body 610 is naturally blocked between the lower port of the upper hole section 611 and the upper end surface of the convex column 603. In the center of the upper end surface of the convex column 603, a groove 606 is provided. A pressing block 609 is slidably fitted in the groove 606. The shape memory alloy 607 is arranged in a spring shape and abuts against the bottom of the groove 606 and the pressing block 609 at both ends respectively. According to needs, a support column 608 is fixed in the center of the bottom surface of the pressing block 609 to prevent the pressing block 609 from moving down excessively. And when the lower end of the support column 608 abuts against the bottom of the groove 606, the top surface of the pressing block 609 is flush with the upper end surface of the convex column 603, ensuring that the sponge body 610 can be placed flat. The shape memory alloy 607 is sleeved outside the support column 608, and the support column 608 is used to expand and guide the shape memory alloy 607. A gap is left between the outer wall of the convex column 603 and the wall of the cylinder cavity 602. A lower hole section 604 communicating the gap with the outer cover surface of the bottom cover 605 is provided inside the bottom cover 605, ensuring that the lubricating oil can flow out from the gap and the lower hole section 604. According to needs, the gap is an annular gap. A plurality of lower hole sections 604 are uniformly arranged along the annular gap in a ring shape, and the lower ends of the plurality of lower hole sections 604 converge and communicate, ensuring that the lubricating oil can be discharged evenly. When the shape memory alloy 607 is expanded by the heat transfer of the braking resistor 5, it will push the pressing block 609 to squeeze the sponge body 610 upward. The lubricating liquid flowing out of the sponge body 610 flows out through the gap and the lower hole section 604 under the action of gravity. However, when the lifting mechanism brakes frequently during lifting and lowering, and the shape memory alloy 607 continues to be heated and expanded, it can continuously compress the sponge body 610. At this time, the structure of the sponge body 610 is compact, completely blocking the upper hole section 611 to prevent the lubricating oil from flowing out continuously. When the lifting mechanism is reduced or stopped using, the temperature of the braking resistor 5 decreases, and the shape memory alloy 607 retracts, causing the pressing block 609 to move down and reset. At this time, the sponge body 610 also returns to normal. Embodiment Three:

[0027] Combined with the attached Figure 1 As shown, the difference from the first embodiment is that a storage battery 9 is connected in parallel to the fueling device. The fueling device and the storage battery 9 are respectively connected in series with a relay 7 and a normally open contact switch 8 of the relay 7. If the braking resistor 5 is accidentally damaged and open-circuited, the normally open contact switch 8 closes, and the energy feedback by the lifting motor 2 can be temporarily collected by using the storage battery 9 first.

[0028] The parts not detailed in the present invention are prior arts. For those skilled in the art, it is obvious that the present invention is not limited to the details of the above-described exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, from any point of view, the above embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be embraced within the present invention, and any reference signs in the claims should not be regarded as limiting the content of the claims involved.

Claims

1. A lifting mechanism motor braking energy recovery system, comprising a drum (1), a lifting motor (2) for controlling the rotation of the drum (1), a brake (3) for controlling the braking of the drum (1), and a braking resistor (5) connected to a discharge circuit of the lifting motor (2), wherein: A refueling device for adding lubricating oil to the brake pad of the brake (3) is provided above the brake (3), and the brake resistor (5) transfers temperature to the refueling device; the refueling device comprises an oil storage bottle (4) and an oil outlet nozzle (6) connected to the bottom of the oil storage bottle (4), and the brake resistor (5) is configured as a long line and wound around the oil storage bottle (4) and the oil outlet nozzle (6); an oil outlet channel is provided at the center of the oil outlet nozzle (6), the upper end of which is connected to the oil storage bottle (4), and the oil outlet channel is blocked by a sponge (610), and the sponge (610) is in contact with a shape memory alloy (607) that expands under heat; The oil outlet nozzle (6) comprises a heat-conducting tube (601) having a tube cavity (602); the upper end of the heat-conducting tube (601) is closed to form an upper hole section (611) connected to the oil storage bottle (4); the lower end cover of the heat-conducting tube (601) is fixed with a bottom cover (605); a convex column (603) corresponding to the insertion into the tube cavity (602) is provided at the center of the inner cover surface of the bottom cover (605); the sponge (610) is naturally blocked at the lower end of the upper hole section (611) and the upper end of the convex column (603). A groove (606) is provided at the center of the upper end surface of the boss (603), a pressure block (609) is slidably provided in the groove (606), the shape memory alloy (607) is configured as a spring, and the two ends thereof are respectively in contact with the bottom of the groove (606) and the pressure block (609); a gap is left between the outer wall of the boss (603) and the wall of the barrel cavity (602), and a lower hole section (604) is provided in the bottom cover (605) for connecting the gap with the outer cover surface of the bottom cover (605).

2. The lifting mechanism motor braking energy recovery and utilization system according to claim 1 is characterized in that: A support column (608) is fixed at the center of the bottom surface of the pressing block (609), and when the lower end of the support column (608) contacts the bottom of the groove (606), the top surface of the pressing block (609) is flush with the upper end surface of the protruding column (603), and the shape memory alloy (607) is sleeved outside the support column (608).

3. The lifting mechanism motor braking energy recovery and utilization system according to claim 1 is characterized in that: The gap is an annular gap, and a plurality of lower hole sections (604) are evenly arranged along the annular gap, and the lower ends of the plurality of lower hole sections (604) are joined and connected.

4. The lifting mechanism motor braking energy recovery system according to claim 1 is characterized in that: The braking resistor (5) comprises a low resistance section and a high resistance section which are connected in series and are respectively wound around the outer wall of the oil storage bottle (4) and embedded in the oil outlet nozzle (6).

5. The lifting mechanism motor braking energy recovery and utilization system according to claim 1 is characterized in that: The shape memory alloy (607) is configured as a nickel-titanium alloy.

6. The lifting mechanism motor braking energy recovery and utilization system according to claim 1 is characterized in that: The oil outlet nozzle (6) is provided with a heat-insulating layer outside.

7. The lifting mechanism motor braking energy recovery and utilization system according to claim 1 is characterized in that: The refueling device is connected in parallel with a storage battery (9), and the refueling device and the storage battery (9) are respectively connected in series with a relay (7) and a normally open contact switch (8) of the relay (7).

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