CN212455012U - Hydraulic lifting device, lifter and lift truck - Google Patents
Hydraulic lifting device, lifter and lift truck Download PDFInfo
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- CN212455012U CN212455012U CN202020595923.7U CN202020595923U CN212455012U CN 212455012 U CN212455012 U CN 212455012U CN 202020595923 U CN202020595923 U CN 202020595923U CN 212455012 U CN212455012 U CN 212455012U
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Abstract
The utility model provides a hydraulic lifting device, lift and lift truck relates to jacking equipment technical field, and this hydraulic lifting device includes: the lifting oil cylinder, the oil pump, the motor and the storage battery; the lifting oil cylinder is used for driving the lifting platform to ascend or descend and is provided with a rod cavity and a rodless cavity; the oil pump is used for supplying oil to the rodless cavity of the lifting oil cylinder so as to drive the piston rod of the lifting oil cylinder to extend out, and can reversely output power under the driving of reverse pressure oil flowing in from the rodless cavity; the motor is in power connection with the oil pump, is used for driving the oil pump to rotate positively and can synchronously generate electricity in a reverse mode when the oil pump rotates reversely; the storage battery is connected with the motor circuit and can store the electric energy generated by the motor. The hydraulic lifting device is provided with the reversible oil pump to generate electricity by utilizing the descending process, so that the energy utilization rate of the hydraulic lifting device in the operation process is improved to reduce energy consumption.
Description
Technical Field
The application relates to the technical field of lifting equipment, in particular to a hydraulic lifting device, a lifter and a lift truck.
Background
The lifting device is capable of lifting a person or cargo to a certain height. When vertical conveying is performed in logistics systems such as factories and automatic warehouses, various plane conveying devices are often arranged on the lifting platform and serve as connecting devices of conveying lines with different heights. The hydraulic lifting platform is generally driven by hydraulic pressure, so the hydraulic lifting platform is called as a hydraulic lifting platform. The device is widely applied to high-altitude installation, maintenance and other operations besides being used for conveying goods with different heights. For example, chinese patent CN201210291697.3 discloses a lifting platform vehicle, in the technical solution related to the patent, a lifting platform is mounted on a frame rail of a multifunctional special vehicle through a lifting platform base, one end of a hydraulic cylinder is hinged on the lifting platform base, and the other end of the hydraulic cylinder is hinged on a scissor frame of the lifting platform. The lifting platform truck drives the lifting platform to lift through the hydraulic oil cylinder. In addition, chinese patent CN201710271909.4 discloses a novel scissor arm and scissor lift platform, and the lift platform referred in this patent document is driven by a hydraulic cylinder during the lift process.
At present, the hydraulic lifting platform is low in energy utilization rate and high in energy consumption in the lifting operation process.
SUMMERY OF THE UTILITY MODEL
The technical problem that this application will be solved lies in, to prior art's the aforesaid not enough, provides a hydraulic lifting device, lift and lift truck to improve hydraulic lifting device at the energy utilization of operation in-process, reduce the energy consumption.
This hydraulic pressure elevating gear includes:
the lifting oil cylinder is used for driving the lifting platform to ascend or descend and is provided with a rod cavity and a rodless cavity;
the oil pump is used for supplying oil to a rodless cavity of the lifting oil cylinder so as to drive a piston rod of the lifting oil cylinder to extend out, and can reversely output power under the driving of reverse pressure oil flowing in from the rodless cavity;
the motor is in power connection with the oil pump, is used for driving the oil pump to rotate positively, and can synchronously generate electricity in a reverse mode when the oil pump rotates reversely;
and the storage battery is connected with the motor circuit and can store the electric energy generated by the motor.
The hydraulic lifting device further comprises a four-way reversing valve, wherein the four-way reversing valve comprises a first oil port P, a second oil port T, a third oil port A and a fourth oil port B, the first oil port P is connected to an oil outlet of the oil pump, the second oil port T is connected with the oil tank, the third oil port A is connected with a rodless cavity of the lifting oil cylinder, and the fourth oil port B is connected with a rod cavity of the lifting oil cylinder; the four-way reversing valve at least has a first working position and a second working position; when the valve core of the four-way reversing valve is positioned at a first working position, the third oil port A is communicated with the first oil port P, and the fourth oil port B is communicated with the second oil port T; when the valve core of the four-way reversing valve is positioned at a second working position, the third oil port A is communicated with the first oil port P, and the fourth oil port B is not communicated with the second oil port T;
a differential circuit is arranged between a rod cavity and a rodless cavity of the lifting oil cylinder; the differential circuit is provided with a first switch valve capable of adjusting the on-off of the oil circuit.
Furthermore, the four-way reversing valve also has a third working position; when the valve core of the four-way reversing valve is in the third working position, the third oil port A is not communicated with the first oil port P, and the fourth oil port B is not communicated with the second oil port T.
Further, the first switch valve is specifically a two-position two-way valve; when the two-position two-way valve is adjusted to the first working position, the oil way is communicated, and when the two-position two-way valve is adjusted to the first working position, the oil way is disconnected.
Furthermore, when a piston rod of the lifting oil cylinder extends out, oil liquid in a rod cavity of the lifting oil cylinder is directly discharged into an oil tank; when the piston rod of the lifting oil cylinder is contracted, the rod cavity of the lifting oil cylinder directly sucks oil from the oil tank.
Furthermore, the storage battery can also supply power to the motor when the motor positively drives the oil pump to work.
Furthermore, the hydraulic lifting device is also provided with a speed regulating circuit; one end of the speed regulating loop is connected to an oil outlet of the oil pump, and the other end of the speed regulating loop is connected to the oil tank; the speed regulating loop is provided with a speed regulating valve and a second switch valve capable of regulating the on-off of an oil way.
Further, the second switch valve is specifically a two-position two-way valve.
On the other hand, the application also provides a lifter which is provided with any one of the hydraulic lifting devices.
On the other hand, this application has still provided a lift truck, and above-mentioned any kind of lift is installed to this lift truck.
In the technical scheme, when the lifting oil cylinder descends, the rodless cavity of the lifting oil cylinder can output pressure oil to drive the oil pump to reversely output power, and the oil pump reversely rotates to drive the motor to synchronously reversely rotate to generate power and store the power in the storage battery. Therefore, the hydraulic lifting device is provided with the reversible oil pump to generate electricity by utilizing the descending process, so that the energy utilization rate of the hydraulic lifting device in the operation process is improved to reduce energy consumption.
Drawings
Fig. 1 is a schematic structural diagram of a hydraulic lifting device in an embodiment of the present application.
Detailed Description
The following are specific embodiments of the present application and are further described with reference to the drawings, but the present application is not limited to these embodiments. In the following description, specific details such as specific configurations and components are provided only to help the embodiments of the present application be fully understood. Accordingly, it will be apparent to those skilled in the art that various changes and modifications may be made to the embodiments described herein without departing from the scope and spirit of the present application. In addition, descriptions of well-known functions and constructions are omitted for clarity and conciseness.
In addition, the embodiments and features of the embodiments in the present application may be combined with each other without conflict.
Referring to fig. 1, the hydraulic lifting device includes: the lifting oil cylinder 10, the oil pump 30, the motor 40 and the storage battery 50; the lift cylinder 10 is used for driving the lift platform to ascend or descend. The lift cylinder 10 has rod chambers and rodless chambers. The oil pump 30 is used to supply oil to the rodless chamber of the lift cylinder 10 to drive the piston rod of the lift cylinder 10 to extend, and is capable of outputting power in reverse under the drive of reverse pressure oil flowing from the rodless chamber. The motor 40 is in power connection with the oil pump 30, and the motor 40 is used for driving the oil pump 30 to rotate in the forward direction and can synchronously generate electricity in the reverse direction when the oil pump 30 rotates in the reverse direction. The battery 50 is electrically connected to the motor 40 and can store electric energy generated by the motor 40. When the hydraulic lifting device is lifted, the oil pump 30 supplies oil to the rodless cavity of the lifting cylinder 10 to drive the piston rod of the lifting cylinder 10 to extend. When the hydraulic lifting device descends, the rodless cavity of the lifting oil cylinder 10 can output pressure oil to drive the oil pump 30 to rotate reversely, and the oil pump 30 reverses to drive the motor 40 to synchronously reverse to generate electricity and store the electricity in the storage battery 50. Therefore, the hydraulic lifting device is provided with the reversible oil pump 30 to generate electricity by utilizing the descending process, so that the energy utilization rate of the hydraulic lifting device in the working process is improved to reduce energy consumption.
The forward rotation direction of the oil pump 30 is the rotation direction of the oil pump during normal operation, and pressure oil is output from the oil outlet when the oil pump 30 rotates in the forward direction.
The hydraulic pump is a power element of a hydraulic system, and is an element that is driven by an engine or an electric motor, sucks oil from a hydraulic oil tank, discharges the pressure oil, and sends the pressure oil to an actuator. The oil pump 30 may be used as a hydraulic motor in reverse to reverse the output power when pressure oil is injected in reverse. The oil pumps used in prior art hydraulic systems are generally irreversible or not suitable for reversal, and there is no interchangeability between conventional oil pumps and hydraulic motors. In the embodiment of the application, the oil pump 30 which can be used as a hydraulic motor in a reversible manner and the motor 40 which can be used for generating power in a reversible manner are adopted, the oil pump 30 rotates in a reverse direction by the pressure oil output by the rodless cavity of the lifting oil cylinder 10 under the action of the load applied by the lifting platform in the descending process, the motor 40 is driven to rotate in a reverse direction to generate power, and the generated power is stored in the storage battery 50, so that the energy utilization rate in the working process of the hydraulic lifting device is improved. In addition, in this application embodiment, the process of adopting oil pump 30 reverse rotation to drive motor 40 electricity generation need not set up independent electricity generation subassembly, and is more simple and reliable in structure.
Specifically, the oil pump 30 may employ a bidirectional gear pump having the same size of inlet and outlet, and capable of serving as a hydraulic motor.
In addition, in the embodiment of the present application, the motor 40 is in power connection with the oil pump 30. During the ascending of the hydraulic lift, the motor 40 may drive the oil pump 30 to rotate so that the oil pump 30 outputs pressure oil. During the descent of the hydraulic lift, the power generation can be synchronously reversed when the oil pump 30 reverses. The motor 40 may be a permanent magnet synchronous motor, which is a synchronous motor that is excited by permanent magnets to generate a synchronous rotating magnetic field, the permanent magnets serve as a rotor to generate a rotating magnetic field, and the three-phase stator winding induces three-phase symmetrical current through armature reaction under the action of the rotating magnetic field.
In some embodiments, the hydraulic lifting device further includes a four-way directional valve 20, which includes a first port P, a second port T, a third port a, and a fourth port B, wherein the first port P is connected to the oil outlet of the oil pump 30, the second port T is connected to the oil tank, the third port a is connected to the rodless cavity of the lift cylinder 10, and the fourth port B is connected to the rod cavity of the lift cylinder 10; the four-way reversing valve 20 has at least a first operating position and a second operating position; when the valve core of the four-way reversing valve 20 is in the first working position, the third oil port A is communicated with the first oil port P, and the fourth oil port B is communicated with the second oil port T; when the valve core of the four-way reversing valve 20 is in the second working position, the third oil port A is communicated with the first oil port P, and the fourth oil port B is not communicated with the second oil port T; a differential circuit 60 is arranged between the rod cavity and the rodless cavity of the lifting oil cylinder 10; the differential circuit 60 is provided with a first on-off valve 61 that can adjust the on-off state of an oil passage. The lifting process of the hydraulic lifting device is as follows: the valve core of the four-way reversing valve 20 is adjusted to a first working position, the oil pump 30 outputs pressure oil to the rodless cavity of the lifting oil cylinder 10 through the four-way reversing valve 20, the rod cavity of the lifting oil cylinder 10 discharges the oil to the oil tank through the four-way reversing valve 20, and in the process, the piston rod of the lifting oil cylinder 10 extends out to drive the lifting platform to ascend. The descending process of the hydraulic lifting device is as follows: the spool of the four-way reversing valve 20 is adjusted to the second working position, the first switch valve 61 is opened, the rodless cavity of the lift cylinder 10 outputs pressure oil under the action of the load applied by the lift platform, a part of the output pressure oil is supplemented to the rod cavity through the differential circuit 60, and most of the output pressure oil directly returns to the oil pump 30 through the four-way reversing valve 20 to drive the oil pump 30 to reversely rotate.
It should be noted that the flow rate of the differential circuit 60 may be set according to the specific type of the hydraulic lifting device, so that hydraulic lifting devices with different specifications have the same descending speed.
In addition, in the ascending process of the hydraulic lifting device, the four-way reversing valve 20 can be adjusted to the second working position, the first switch valve 61 is opened, at the moment, the oil pump 30 outputs pressure oil to the rodless cavity of the lifting oil cylinder 10 through the four-way reversing valve 20, and oil in the rod cavity can be supplemented to the rodless cavity through the differential circuit 60, so that the extending speed of the piston rod is accelerated under the condition that the flow rate of the oil output by the oil pump 30 is not changed, and the ascending speed can be improved under the condition of small load.
In some embodiments, the four-way reversing valve 20 also has a third operating position; when the valve core of the four-way reversing valve 20 is in the third working position, the third oil port a is not communicated with the first oil port P, and the fourth oil port B is not communicated with the second oil port T. When the lift cylinder 10 is not actuated, the four-way selector valve 20 is adjusted to a third operating position.
Specifically, the first switch valve 61 is used for controlling the on/off of the oil path, and in some embodiments, the first switch valve 61 is specifically a two-position two-way valve; when the two-position two-way valve is adjusted to the first working position, the oil way is communicated, and when the two-position two-way valve is adjusted to the first working position, the oil way is disconnected.
In some embodiments, when the piston rod of the lift cylinder 10 is extended, the oil in the rod chamber is directly discharged into the oil tank; when the piston rod of the lift cylinder 10 is contracted, the rod cavity of the lift cylinder directly sucks oil from the oil tank.
Further, the battery 50 may also supply power to the motor 40 when the motor 40 is operating to positively drive the oil pump 30. During the lowering of the hydraulic lifting device, the electric motor 40 charges the accumulator 50, and this charged electric energy can be used for the raising of the hydraulic lifting device. A motor controller 90 is also provided between the battery 50 and the motor 40. When the motor 40 drives the oil pump 30 to work in a forward rotation mode, the controller 90 converts direct current output by the storage battery 50 into alternating current to drive the motor 40 to rotate in the forward direction, and when the oil pump 30 drives the motor to generate electricity in a reverse rotation mode, the controller 90 converts the alternating current generated by the motor 40 into direct current to charge the storage battery 50.
In some embodiments, the hydraulic lift device also has a speed control circuit 70; one end of the speed regulating loop 70 is connected to an oil outlet of the oil pump 30, and the other end is connected to an oil tank; the speed control circuit 70 is provided with a speed control valve 71 and a second switch valve 72 capable of adjusting the on-off of an oil path. During the descending process of the hydraulic lifting device, the second switch valve 72 can be adjusted to be switched on, at the moment, part or all of the oil flows back to the oil tank through the speed regulating valve 71, so that the oil flow flowing to the oil pump 30 is reduced, the generated energy is reduced, and the descending speed of the hydraulic lifting device is accelerated. Thus, the governor circuit 70 can be used to regulate the amount of power generated and the rate of descent of the hydraulic hoist during descent. When the descending speed needs to be increased, the second switch valve 72 can be opened, and the descending speed of the hydraulic lifting device is adjusted through the speed adjusting valve 71.
Specifically, the second switch valve 72 is used to control the on/off of the oil path, and in some embodiments, the second switch valve 72 is a two-position two-way valve having two working positions, wherein the oil path is on when the first working position is adjusted, and the oil path is off when the second working position is adjusted.
In addition, the hydraulic lifting device is further provided with an overflow loop 80, one end of the overflow loop 80 is connected to one end of an oil outlet of the oil pump 30, the other end of the overflow loop is connected with an oil tank, and an overflow valve 81 is arranged on the overflow loop.
The embodiment of the application also provides the elevator, which is provided with the hydraulic lifting device provided by the above embodiment part, and the hydraulic lifting device is used for driving the lifting platform to move up and down. For related matters, reference may be made to the description of the hydraulic lifting device in the above embodiment, and details are not repeated here.
The embodiment of the application also provides a lift truck, the lift truck is provided with the lifter provided by the embodiment, the lift truck is provided with an automobile, and the lifter is arranged on the automobile and used for aerial operation. For related matters, reference is made to the description of the elevator in the above embodiment, and details are not repeated here.
In the description of the present application, it is to be understood that the terms "upper", "lower", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present application.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present application, "plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
The specific embodiments described herein are merely illustrative of the spirit of the application. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the present application as defined by the appended claims.
Claims (10)
1. A hydraulic lifting device, characterized in that it comprises:
the lifting oil cylinder (10) is used for driving the lifting platform to ascend or descend, and the lifting oil cylinder (10) is provided with a rod cavity and a rodless cavity;
an oil pump (30) for supplying oil to a rodless chamber of the lift cylinder (10) to drive a piston rod of the lift cylinder (10) to extend, and being capable of outputting power in a reverse direction under the drive of reverse pressure oil flowing in from the rodless chamber;
the motor (40) is in power connection with the oil pump (30), the motor (40) is used for driving the oil pump (30) to rotate in the forward direction, and can synchronously generate electricity in a reverse mode when the oil pump (30) reverses;
and the storage battery (50) is electrically connected with the motor (40) and can store the electric energy generated by the motor (40).
2. The hydraulic lifting device according to claim 1, further comprising a four-way directional valve (20) including a first port (P), a second port (T), a third port (a), and a fourth port (B), wherein the first port (P) is connected to an oil outlet of the oil pump (30), the second port (T) is connected to an oil tank, the third port (a) is connected to a rodless cavity of the lifting cylinder (10), and the fourth port (B) is connected to a rod cavity of the lifting cylinder (10); the four-way reversing valve (20) has at least a first operating position and a second operating position; when the valve core of the four-way reversing valve (20) is positioned at a first working position, the third oil port (A) is communicated with the first oil port (P), and the fourth oil port (B) is communicated with the second oil port (T); when the valve core of the four-way reversing valve (20) is in the second working position, the third oil port (A) is communicated with the first oil port (P), and the fourth oil port (B) is not communicated with the second oil port (T);
a differential circuit (60) is arranged between a rod cavity and a rodless cavity of the lifting oil cylinder (10); the differential circuit (60) is provided with a first switch valve (61) capable of adjusting the on-off of an oil path.
3. The hydraulic lifting device according to claim 2, characterized in that the four-way reversing valve (20) also has a third operating position; when the valve core of the four-way reversing valve (20) is located at the third working position, the third oil port (A) is not communicated with the first oil port (P), and the fourth oil port (B) is not communicated with the second oil port (T).
4. Hydraulic lifting device according to claim 2, characterized in that the first switching valve (61) is embodied as a two-position, two-way valve; when the two-position two-way valve is adjusted to the first working position, the oil way is communicated, and when the two-position two-way valve is adjusted to the first working position, the oil way is disconnected.
5. The hydraulic lifting device according to claim 1, characterized in that when the piston rod of the lifting cylinder (10) is extended, the oil in the rod chamber is directly discharged into the oil tank; when a piston rod of the lifting oil cylinder (10) is contracted, a rod cavity of the lifting oil cylinder directly sucks oil from an oil tank.
6. The hydraulic lifting device according to claim 1, wherein the battery (50) is further configured to supply power to the motor (40) when the motor (40) is operating to positively drive the oil pump (30).
7. Hydraulic lifting device according to claim 1, characterized in that it further has a speed regulation circuit (70); one end of the speed regulating loop (70) is connected to an oil outlet of the oil pump (30), and the other end of the speed regulating loop is connected to an oil tank; the speed regulating loop (70) is provided with a speed regulating valve (71) and a second switch valve (72) capable of regulating the on-off of an oil way.
8. The hydraulic lifting device as claimed in claim 7, characterized in that the second switching valve (72) is embodied as a two-position, two-way valve.
9. An elevator, characterized in that it has a hydraulic lifting device according to any one of claims 1-8.
10. A lift truck characterized in that it is fitted with a lift as claimed in claim 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020595923.7U CN212455012U (en) | 2020-04-20 | 2020-04-20 | Hydraulic lifting device, lifter and lift truck |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020595923.7U CN212455012U (en) | 2020-04-20 | 2020-04-20 | Hydraulic lifting device, lifter and lift truck |
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| CN212455012U true CN212455012U (en) | 2021-02-02 |
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| CN202020595923.7U Active CN212455012U (en) | 2020-04-20 | 2020-04-20 | Hydraulic lifting device, lifter and lift truck |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114105014A (en) * | 2021-10-28 | 2022-03-01 | 湖南三一中型起重机械有限公司 | Auxiliary boom amplitude-variable hydraulic system and operation machine |
| CN114183416A (en) * | 2021-12-16 | 2022-03-15 | 杭叉集团股份有限公司 | Three-way stacking type forklift hydraulic system |
| CN114738340A (en) * | 2022-05-16 | 2022-07-12 | 江苏谷登桩工科技有限公司 | Rapid pile lifting potential energy regeneration system of static pile press and control method thereof |
-
2020
- 2020-04-20 CN CN202020595923.7U patent/CN212455012U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114105014A (en) * | 2021-10-28 | 2022-03-01 | 湖南三一中型起重机械有限公司 | Auxiliary boom amplitude-variable hydraulic system and operation machine |
| CN114183416A (en) * | 2021-12-16 | 2022-03-15 | 杭叉集团股份有限公司 | Three-way stacking type forklift hydraulic system |
| CN114738340A (en) * | 2022-05-16 | 2022-07-12 | 江苏谷登桩工科技有限公司 | Rapid pile lifting potential energy regeneration system of static pile press and control method thereof |
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