Hoisting device with energy recycling and reusing functions for crane

Abstract

The invention relates to a lifting device with an energy recycling function for a crane in the technical field of cranes, which comprises a crane trolley, a lifting mechanism mounted on the crane trolley and formed by sequentially connecting a driving motor, a speed reducer, a winding drum and a safety brake in a transmission manner, and a super resistor connected with the driving motor in parallel, the energy conversion mechanism comprises a water storage tank, a water pump, a supercharger and a crankshaft, the water inlet end of the water pump is connected with the water storage tank, and the water outlet end of the water pump is connected with a heat absorption pipe; in the descending process of the lifting appliance and the lifted object, the driving motor drives the water pump to do work, so that water absorbs heat generated by the super resistor to be vaporized and enters the supercharger to be pressurized and stored; when the driving motor drives the winding drum to rotate forwards to lift a lifting appliance and a lifted object, water vapor in the supercharger enters the air cylinder through the valve, so that the air cylinder acts to drive the crankshaft spindle to rotate forwards, and the crankshaft spindle rotates forwards to drive the winding drum to rotate forwards to assist the driving motor in acting.

Description

Technical Field

[0001] The invention relates to the technical field of cranes, and in particular to a lifting device with energy recovery and reuse for cranes. Background Art

[0002] As is known, a crane is an intelligent lifting and handling equipment. In recent years, with the development of science and technology, the application scope of cranes has become more and more extensive and frequent.

[0003] At present, when the crane is lowering the spreader, the gravitational potential energy of the spreader (including the suspended object) is converted into electrical energy through the reverse braking of the engine. However, this part of the electrical energy is difficult to be effectively integrated into the power grid for storage. Therefore, a super resistor is connected to the motor to dissipate this part of the energy into the air in the form of heat energy through the heat generated by the super resistor. At the same time, the heat energy generated by the brake itself is usually directly dissipated into the air. This not only causes the surrounding temperature to rise, but also results in serious energy waste.

[0004] For this purpose, we designed a lifting device for cranes with energy recovery and reuse. Summary of the invention

[0005] In order to overcome the deficiencies in the background technology, the present invention discloses a lifting device for a crane with energy recovery and reuse.

[0006] In order to achieve the above-mentioned invention object, the present invention adopts the following technical scheme: A lifting device with energy recovery and reuse for a crane comprises a crane trolley, a lifting mechanism installed on the crane trolley and composed of a driving motor, a reducer, a drum and a safety brake which are sequentially connected in a transmission manner, a super resistor connected in parallel with the driving motor, and an energy conversion mechanism and a directional transmission mechanism. The energy conversion mechanism comprises a water storage tank, a water pump, a supercharger and a crankshaft. The water inlet end of the water pump is connected to the water storage tank, and the water outlet end is connected to a heat absorption pipe, the heat absorption pipe is wound around the super resistor, and the outlet end is connected to the supercharger. The output end of the supercharger is connected to a cylinder through a valve, and the cylinder piston rod is rotatably connected to a crankshaft connecting rod. The crankshaft main shaft is connected to the drum through a directional transmission mechanism, so that the reciprocating telescopic motion of the cylinder drives the crankshaft main shaft to rotate forward, thereby assisting the drum to rotate forward. The directional transmission mechanism includes a transmission shaft connected to the crankshaft main shaft and a transmission sleeve connected to the reel. A plurality of radial holes are arranged on the shaft body at one end of the transmission shaft along its circumference. A transmission rod is axially slidably inserted into the radial hole cavity. The outer end of the transmission rod extends out, and the side corresponding to the reversal direction of the transmission shaft is an inclined surface. One end of the transmission sleeve is rotatably sleeved on the end of the transmission shaft, and the inner wall is provided with a matching hole for the outer end of the transmission rod to be inserted in a one-to-one matching manner. A compression spring is also provided at the bottom of the radial hole cavity to squeeze the corresponding transmission rod outward.

[0007] Preferably, both ends of the drive motor output shaft extend out, one end of the drive motor output shaft is connected to the reducer, and the other end is connected to the water pump rotor through a directional transmission mechanism, so that the drive motor reverses to drive the water pump rotor to rotate, thereby allowing the water in the water tank to be pumped into the heat absorption tube.

[0008] Preferably, the reducer has two output shafts, each output shaft of the reducer is correspondingly connected to a reel, and each reel is correspondingly connected to the crankshaft main shaft through a directional transmission mechanism.

[0009] Preferably, both ends of the cylinder piston rod extend out, and both ends of the cylinder piston rod are respectively connected to the corresponding crankshaft connecting rods.

[0010] Preferably, it also includes an exhaust pipe, and the outlet end of the exhaust pipe corresponds to the component in the lifting mechanism that can generate heat.

[0011] Preferably, the valve has a first air inlet passage that enables the supercharger to communicate with one end of the cylinder and a first air outlet passage that enables the exhaust pipe to communicate with the other end of the cylinder; The valve also has a second air inlet passage that can connect the supercharger with the other end of the cylinder and a second air outlet passage that can connect the exhaust pipe with one end of the cylinder.

[0012] Preferably, one-way air inlet valves are provided at both ends of the cylinder; the valve also has a third air outlet and a fourth air outlet that can simultaneously connect the exhaust pipe with both ends of the cylinder, so that the reel reverses to drive the crank to reverse, and then drives the cylinder to reciprocate and extend, so that the cylinder supplies air to the exhaust pipe.

[0013] Preferably, the crane trolley is provided with a mounting frame, the crankshaft main shaft is rotatably connected to the mounting frame, and the cylinder is correspondingly fixed to the mounting frame.

[0014] Preferably, the crankshaft main shaft coaxial fixing sleeve is provided with a flywheel.

[0015] Due to the adoption of the above-mentioned technical solution, the present invention has the following beneficial effects: 1. During the lowering process of the hoist and the object being hoisted, the driving motor drives the water pump to work, so that the water in the heat absorption tube absorbs the heat generated by the super resistor and vaporizes to enter the supercharger for pressurization and storage, realizing the function of energy recovery; when the driving motor drives the drum to rotate forward through the reducer to lift the hoist and the object being hoisted, the supercharger opens, and the water vapor in the supercharger enters the cylinder through the valve, so that the cylinder works to drive the crankshaft main shaft to rotate forward, and the crankshaft main shaft rotates forward to drive the drum to rotate forward, assisting the driving motor to work, realizing the function of recycling the recovered energy; 2. The design of two reels and two crankshafts enables the cylinder to drive the two crankshafts to rotate, making the structure more compact and also improving the utilization rate of recycled energy; 3. The setting of the valve and the exhaust pipe can allow the gas at the exhaust end of the inner cavity to cool the lifting mechanism through the exhaust pipe during the reciprocating motion of the cylinder piston rod, so that the energy can be utilized again. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the present invention; Figure 2 The three-state principle diagram of the valve in the present invention; Figure 3 It is a structural schematic diagram of the directional transmission mechanism in the present invention; Figure 4 It is an axial cross-sectional view of the directional transmission mechanism of the present invention; Figure 5 It is a radial cross-sectional view of the directional transmission mechanism in the present invention.

[0017] In the figure: 1. driving motor; 2. speed reducer; 3. reel; 4. safety brake; 5. super resistor; 6. energy conversion mechanism; 61. water tank; 62. water pump; 63. heat absorption pipe; 64. supercharger; 65. cylinder; 66. crankshaft; 67. valve; 671. first air inlet; 672. second air inlet; 673. first air outlet; 674. second air outlet; 675. third air outlet; 676. fourth air outlet; 68. one-way air inlet valve; 69. exhaust pipe; 7. directional transmission mechanism; 71. transmission shaft; 711. radial hole; 72. transmission sleeve; 721. matching hole; 73. transmission rod; 74. compression spring; 8. mounting bracket. DETAILED DESCRIPTION

[0018] The present invention can be explained in detail through the following embodiments. The purpose of disclosing the present invention is to protect all technical improvements within the scope of the present invention. In the description of the present invention, it should be understood that if there are terms such as "upper", "lower", "front", "back", "left", "right", etc. indicating directions or positional relationships, they only correspond to the drawings of the present application and are for the convenience of describing the present invention; it should be understood that if there are terms such as "end", "side", "end portion", "lateral", "lateral", "transverse", "longitudinal", etc. indicating directions or positional relationships, they only correspond to the length and width of the corresponding components, that is, the "end portion" indicates the head and tail areas in the length direction of the corresponding component, and the "side portion" indicates the head and tail areas in the width direction of the corresponding component; this is for the convenience of describing the present invention and is not to indicate or imply that the device or element referred to must have a specific direction.

[0019] Embodiment 1, in combination with the attached Figure 1 ,3 -5, a lifting device with energy recovery and reuse for a crane, comprising a crane trolley, a lifting mechanism installed on the crane trolley and composed of a drive motor 1, a reducer 2, a drum 3 and a safety brake 4 connected in sequence, a super resistor 5 connected in parallel with the drive motor 1, and a brake can also be provided on the output shaft of the drive motor 1 as needed: it also includes an energy conversion mechanism 6 and a directional transmission mechanism 7, the energy conversion mechanism 6 includes a water tank 61, a water pump 62, a supercharger 64 and a crankshaft 66, the water inlet end of the water pump 62 is connected to the water tank 61, and the water outlet end is connected to a heat absorption pipe 63, the heat absorption pipe 63 is wound around the super resistor 5, and the outlet end is connected to the supercharger 64, the output end of the supercharger 64 is connected to a cylinder 65 through a valve 67, and the piston rod of the cylinder 65 is rotatably connected to the connecting rod of the crankshaft 66, and the main shaft of the crankshaft 66 is connected to the drum 3 through the directional transmission mechanism 7, so that the reciprocating telescopic motion of the cylinder 65 drives the main shaft of the crankshaft 66 to rotate forward, thereby assisting the drum 3 to rotate forward; The directional transmission mechanism 7 includes a transmission shaft 71 connected to the main shaft of the crankshaft 66 and a transmission sleeve 72 connected to the reel 3. The shaft body at one end of the transmission shaft 71 is provided with a plurality of radial holes 711 along its circumference. A transmission rod 73 is axially slidably inserted into the cavity of the radial hole 711. The outer end of the transmission rod 73 extends out, and the side corresponding to the reverse direction of the transmission shaft 71 is an inclined surface; one end of the transmission sleeve 72 is rotatably sleeved on the end of the transmission shaft 71, and the inner wall is provided with a matching hole 721 for the outer end of the transmission rod 73 to be inserted in a one-to-one matching manner; the bottom of the cavity of the radial hole 711 is also provided with a compression spring 74 for pressing the corresponding transmission rod 73 outward; that is, when the main shaft of the crankshaft 66 rotates forward, the transmission shaft 71 drives the transmission rod 73 to move in a circle. At this time, the force-applying surface of the side of the outer end of the transmission rod 73 facing the matching hole 721 is in contact with the transmission rod 73. The rotation direction is vertical, so the transmission rod 73 will not move inward, so the transmission shaft 71 can drive the transmission sleeve 72 to rotate forward, and then assist the reel 3 to rotate forward, reducing the output power of the drive motor 1; at the same time, when the crankshaft 66 main shaft reverses, the force-applying surface of the oblique side of the outer end of the transmission rod 73 facing the matching hole 721 is not perpendicular to the rotation direction of the transmission rod 73, so the transmission rod 73 will move inward, so that the transmission shaft 71 can drive the transmission sleeve 72 to rotate; conversely, when the reel 3 reverses, it can drive the crankshaft 66 main shaft to reverse, and when the reel 3 rotates forward, it cannot drive the crankshaft 66 main shaft to rotate forward; on the whole, the forward rotation of the crankshaft 66 main shaft can assist the drive motor 1 to drive the reel 3 to rotate forward, so that the sling and the suspended object rise, and the sling and the suspended object fall, so that the reversal of the reel 3 drives the crankshaft 66 main shaft to reverse.

[0020] It should be noted that the direction in which the drum 3 rotates when the sling and the suspended object are lowered is considered as reverse rotation, and the driving motor 1 drives the drum 3 to rotate through the reducer 2, so that the sling and the suspended object are raised, which is considered as forward rotation of the drum 3.

[0021] Furthermore, both ends of the output shaft of the drive motor 1 extend out, one end of the output shaft of the drive motor 1 is connected to the reducer 2, and the other end is connected to the rotor of the water pump 62 through the directional transmission mechanism 7, so that the drive motor 1 reverses to drive the rotor of the water pump 62 to rotate, and then the water in the water tank 61 is pumped into the heat absorption tube 63; that is, the reverse rotation of the output shaft of the drive motor 1 can drive the rotor of the water pump 62 to rotate and do work; it should be noted that the water pump 62 does not need to be connected to a power supply, so the water pump 62 will not reverse, and therefore the water pump 62 cannot autonomously drive the output shaft of the drive motor 1 to rotate.

[0022] With such arrangement, during the descent of the sling and the suspended object, their gravitational potential energy is converted into electrical energy through the reverse braking of the engine, causing the super resistor 5 to generate heat. In this process, the output shaft of the driving motor 1 is reversed to drive the water pump 62 to do work, so that the water in the water tank 61 is pumped into the heat absorption tube 63 through the water pump 62. At this time, the water in the heat absorption tube 63 absorbs the heat generated by the super resistor 5 to heat up, and even vaporizes. Since the water is continuously injected into the heat absorption tube 63 by the water pump 62, the water vapor is pushed into the supercharger 64 for pressurization and storage, thereby realizing the function of energy recovery. When the driving motor 1 drives the drum 3 to rotate forward through the reducer 2 to lift the sling and the suspended object, the supercharger 64 opens. At this time, the water vapor in the supercharger 64 enters the cylinder 65 through the valve 67; it should be noted that the valve 67 is a solenoid valve, which allows the cylinder 65 to perform a reciprocating telescopic action when the valve 67 is continuously switched, thereby driving the crankshaft 66 to rotate forward, and the forward rotation of the crankshaft 66 drives the drum 3 to rotate forward, assisting the driving motor 1 in doing work, thereby realizing the function of recycling recovered energy; it should be noted that how to drive the crankshaft 66 to rotate forward through the reciprocating telescopic action of the cylinder 65 can be designed with reference to the assembly relationship between the internal combustion engine piston and the crankshaft 66 in the prior art, and no specific details will be given here.

[0023] It should be noted that the work performed by the cylinder 65 will cause the gas temperature to drop.

[0024] Furthermore, the crane trolley is provided with a mounting frame 8 , the crankshaft 66 is rotatably connected to the mounting frame 8 , and the cylinder 65 is fixedly connected to the mounting frame 8 .

[0025] Furthermore, in order to ensure the stability of the rotation of the crankshaft 66, a flywheel 661 is provided on the coaxial fixing sleeve of the crankshaft 66.

[0026] Embodiment 2, combined with the attached Figure 1 A lifting device with energy recovery and reuse for a crane. Based on the first embodiment, the reducer 2 has two output shafts, each output shaft of the reducer 2 is correspondingly connected to a drum 3, and each drum 3 is correspondingly connected to the main shaft of the crankshaft 66 through a directional transmission mechanism 7.

[0027] Furthermore, both ends of the piston rod of the cylinder 65 extend out, and both ends of the piston rod of the cylinder 65 are respectively connected to the corresponding crankshaft 66 connecting rods; the axial reciprocating motion of the piston rod of the cylinder 65 can drive the two crankshafts 66 to rotate, making the structure more compact and also improving the utilization rate of the recycled energy.

[0028] Embodiment 3, in combination with the attached Figure 1 , 3 A lifting device with energy recovery and reuse for a crane, based on the second embodiment, further includes an exhaust pipe 69, and the outlet end of the exhaust pipe 69 corresponds to the components that can generate heat in the lifting mechanism; it should be noted that the components that can generate heat in the lifting mechanism may include a safety brake 4, a drive motor 1, etc. It should be noted that the components cooled by the steam ejected from the outlet end of the exhaust pipe 69 use equipment with a higher waterproof grade to avoid malfunctions.

[0029] The valve 67 has a first air inlet 671 that enables the supercharger 64 to communicate with one end of the cylinder 65, and a first air outlet 673 that enables the exhaust pipe 69 to communicate with the other end of the cylinder 65; that is, the valve 67 allows the water vapor of the supercharger 64 to enter one end of the inner cavity of the cylinder 65 through the first air inlet 671, and at the same time, the gas at the other end of the inner cavity of the cylinder 65 flows into the exhaust pipe 69 through the first air outlet 673, and then is sprayed to the components in the lifting mechanism that can generate heat through the exhaust pipe 69 to cool the components; The valve 67 also has a second air inlet 672 that enables the supercharger 64 to connect with the other end of the cylinder 65 and a second air outlet 674 that enables the exhaust pipe 69 to connect with one end of the cylinder 65; that is, the valve 67 allows the water vapor of the supercharger 64 to enter the other end of the inner cavity of the cylinder 65 through the second air inlet 672, and at the same time, the gas at one end of the inner cavity of the cylinder 65 flows into the exhaust pipe 69 through the second air outlet 674, and then is sprayed to the components in the lifting mechanism that can generate heat through the exhaust pipe 69 to cool the components.

[0030] For ease of understanding, the two ends of the inner cavity of the cylinder 65 can be regarded as the A end and the B end respectively. The valve 67 allows the water vapor of the supercharger 64 to enter the A end of the inner cavity of the cylinder 65 through the first air inlet 671, and at the same time, the gas at the B end of the inner cavity of the cylinder 65 flows into the exhaust pipe 69 through the first air outlet 673, and then is sprayed to the components in the lifting mechanism that can generate heat through the exhaust pipe 69 to cool the components; and the valve 67 allows the water vapor of the supercharger 64 to enter the B end of the inner cavity of the cylinder 65 through the second air inlet 672, and at the same time, the gas at the A end of the inner cavity of the cylinder 65 flows into the exhaust pipe 69 through the second air outlet 674, and then is sprayed to the components in the lifting mechanism that can generate heat through the exhaust pipe 69 to cool the components.

[0031] Furthermore, in order to prevent the cylinder 65 from hindering the reversal of the reel 3, one-way air inlet valves 68 are provided at both ends of the cylinder 65; the valve 67 also has a third air outlet 675 and a fourth air outlet 676 that can simultaneously connect the exhaust pipe 69 with the two ends of the cylinder 65, so that the reversal of the reel 3 drives the crank 56 to reverse, and then drives the cylinder 65 to reciprocate and extend, so that the cylinder 65 supplies air to the exhaust pipe 69; that is, during the reversal of the reel 3, due to the reciprocating motion of the piston rod of the cylinder 65, the external gas can enter the air intake end of the inner cavity of the cylinder 65 through the corresponding one-way air inlet valve 68, and the exhaust end of the inner cavity of the cylinder 65 discharges the gas to the exhaust pipe 69 through the third air outlet 675 or the fourth air outlet 676, and then sprays it to the components in the lifting mechanism that can generate heat to cool the components.

[0032] The parts of the present invention that are not described in detail are prior art. It is obvious to those skilled in the art that the present invention is not limited to the details of the above-mentioned 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, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive, and it is intended that all changes that fall within the meaning and scope of equivalent elements are included in the present invention.

Claims

1. A lifting device for a crane with energy recovery and reuse, comprising a crane trolley, a lifting mechanism installed on the crane trolley and composed of a drive motor (1), a reducer (2), a drum (3) and a safety brake (4) connected in sequence, and a super resistor (5) connected in parallel with the drive motor (1), characterized in that: It also includes an energy conversion mechanism (6) and a directional transmission mechanism (7), wherein the energy conversion mechanism (6) includes a water tank (61), a water pump (62), a supercharger (64) and a crankshaft (66); the water inlet end of the water pump (62) is connected to the water tank (61), and the water outlet end is connected to a heat absorption pipe (63); the heat absorption pipe (63) is wound around the super resistor (5), and the outlet end is connected to the supercharger (64); the output end of the supercharger (64) is connected to a cylinder (65) via a valve (67), and the piston rod of the cylinder (65) is rotatably connected to a connecting rod of the crankshaft (66); the main shaft of the crankshaft (66) is connected to the reel (3) via the directional transmission mechanism (7), so that the reciprocating telescopic motion of the cylinder (65) drives the main shaft of the crankshaft (66) to rotate forward, thereby assisting the reel (3) to rotate forward; The directional transmission mechanism (7) comprises a transmission shaft (71) connected to a main shaft of a crankshaft (66) and a transmission sleeve (72) connected to a winding drum (3); a plurality of radial holes (711) are arranged on a shaft body at one end of the transmission shaft (71) along its circumference; a transmission rod (73) is axially slidably inserted into the cavity of the radial hole (711); an outer end of the transmission rod (73) extends outward, and a side surface corresponding to the reverse direction of the transmission shaft (71) is an inclined surface; one end of the transmission sleeve (72) is rotatably sleeved on the end of the transmission shaft (71), and a matching hole (721) is arranged on the inner wall for the outer end of the transmission rod (73) to be inserted in a one-to-one matching manner; and a compression spring (74) for pressing the corresponding transmission rod (73) outward is also arranged at the bottom of the cavity of the radial hole (711).

2. A lifting device with energy recovery and reuse for a crane according to claim 1, characterized in that: Both ends of the output shaft of the drive motor (1) extend out, one end of the output shaft of the drive motor (1) is connected to the reducer (2), and the other end is connected to the rotor of the water pump (62) via a directional transmission mechanism (7), so that the drive motor (1) can reversely drive the rotor of the water pump (62) to rotate, thereby causing the water in the water storage tank (61) to be pumped into the heat absorption pipe (63).

3. The hoisting device with energy recovery and reuse for crane according to claim 1, characterized in that: The reducer (2) has two output shafts, each output shaft of the reducer (2) is correspondingly connected to a reel (3), and each reel (3) is correspondingly connected to a main shaft of a crankshaft (66) via a directional transmission mechanism (7).

4. The hoisting device with energy recovery and reuse for a crane according to claim 3, characterized in that: Both ends of the piston rod of the cylinder (65) extend out, and both ends of the piston rod of the cylinder (65) are respectively connected to corresponding connecting rods of the crankshaft (66).

5. The hoisting device with energy recovery and reuse for crane according to claim 4, characterized in that: It also includes an exhaust pipe (69), the outlet end of the exhaust pipe (69) correspondingly faces a component in the lifting mechanism that can generate heat.

6. The hoisting device with energy recovery and reuse for a crane according to claim 5, characterized in that: The valve (67) has a first air inlet (671) capable of connecting the supercharger (64) to one end of the cylinder (65) and a first air outlet (673) capable of connecting the exhaust pipe (69) to the other end of the cylinder (65); The valve (67) also has a second air inlet (672) capable of connecting the supercharger (64) with the other end of the cylinder (65) and a second air outlet (674) capable of connecting the exhaust pipe (69) with one end of the cylinder (65).

7. The hoisting device with energy recovery and reuse for a crane according to claim 6, characterized in that: Both ends of the cylinder (65) are provided with one-way air inlet valves (68); the valve (67) also has a third air outlet (675) and a fourth air outlet (676) capable of simultaneously connecting the exhaust pipe (69) and both ends of the cylinder (65), so that the reel (3) can reversely drive the crank (56) to reverse, thereby driving the cylinder (65) to reciprocate and extend, so that the cylinder (65) supplies air to the exhaust pipe (69).

8. The hoisting device with energy recovery and reuse for crane according to claim 1, characterized in that: The crane trolley is provided with a mounting frame (8), the crankshaft (66) main shaft is rotatably connected to the mounting frame (8), and the cylinder (65) is correspondingly fixedly connected to the mounting frame (8).

9. The lifting device with energy recovery and reuse for crane according to claim 1, characterized in that: The crankshaft (66) main shaft coaxial fixing sleeve is provided with a flywheel (661).

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