[0034] The core of the present invention is to provide a hydraulic power system for variable counterweight and a lifting system with the hydraulic power system. The hydraulic power system is set up to balance the gravity imbalance of the lifting movement pair of the lifting system and reduce the counterweight. The power and electrical energy requirements of the power source can also ensure the stable operation of the lifting system.
[0035] In order to enable those skilled in the art to better understand the solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.
[0036] For ease of understanding and concise description, the following description will be combined with the hydraulic power system and the lifting system with the same, and the beneficial effects will not be repeated.
[0037] Please refer to figure 1 with figure 2 , figure 1 It is a structural schematic diagram of a specific embodiment of a hydraulic power system for variable counterweight of the lifting system provided by the present invention; figure 2 It is a schematic diagram of the working principle of the elevator in the specific embodiment.
[0038] The lifting system includes a power source 20 and a load 43. The power source 20 can drive the load 43 to rise and fall. Generally, the power source 20 drives the load 43 to rise and fall by driving the driving wheels 41 to rotate. The power source 20 may specifically adopt a structure such as a motor.
[0039] Usually, the lifting system will be equipped with a fixed counterweight 44 to balance the load 43, which has the effect of saving energy. Of course, some lifting systems do not have a counterweight. At this time, the fixed counterweight can be considered as zero.
[0040] In practical applications, the load 43 of the lifting system will vary according to demand or actual operating conditions. The fixed counterweight 44 is difficult to balance the load 43 under different working conditions. The hydraulic power system 10 provided in this article is matched with the fixed counterweight 44. It is equivalent to a variable counterweight and can be balanced according to changes in the load 43.
[0041] In the lifting system with the fixed counterweight 44, the fixed counterweight 44 and the load 43 are respectively connected to the two ends of the driving rope 42 around the driving wheel 41. When the power source 20 drives the driving wheel 41 to rotate, the driving wheel 41 and the drive The friction force between the ropes 42 transmits power to realize the lifting of the load 43.
[0042] In this embodiment, the hydraulic power system 10 includes a hydraulic motor group 101, a first liquid storage device 102, and a second liquid storage device 103. The hydraulic motor group 101 includes at least one hydraulic motor 111, and the first liquid storage device 102 is located in the second storage device. Above the hydraulic device 102 with a set height difference between the two, the hydraulic motor group 101 is drivingly connected to the driving wheel 41 through the transmission speed change mechanism 31.
[0043] In actual setting, the above-mentioned set height difference can be set according to the application environment and requirements, and the liquid stored in the first liquid storage device 102 and the second liquid storage device 103 can be a liquid medium such as water.
[0044] Among them, the first liquid storage device 102 communicates with the first interface of the hydraulic motor group 101 through the first pipeline 104, and the second liquid storage device 103 communicates with the second interface of the hydraulic motor group 101 through the second pipeline 105. A reversing component is provided on the pipeline, and the reversing component has at least two working positions and is configured as:
[0045] Located in the first working position, the first interface of the hydraulic motor group 101 is the liquid inlet, and the second interface is the liquid outlet, so that the hydraulic motor group 101 works in motor mode, that is, the first liquid storage device 102 located above The liquid flows through the hydraulic motor group 101 to the second liquid storage device 103 located below, the potential energy of the liquid is reduced, and the liquid is converted into mechanical energy and output through the output shaft of the hydraulic motor group 101 to provide power and torque for the driving wheels 41;
[0046] Located in the second working position, the first interface of the hydraulic motor group 101 is the liquid outlet, and the second interface is the liquid inlet, so that the hydraulic motor group 101 works in the pump mode, that is, the second liquid storage device 103 located below The liquid flows through the hydraulic motor group 101 to the upper first liquid storage device 102, and the potential energy of the liquid increases. Through the transmission speed change mechanism 31, the hydraulic motor group 101 provides power for the increase of the liquid potential energy, that is, the hydraulic motor group 101 provides a resistance torque for the driving wheels 41 .
[0047] As above, after the hydraulic power system 10 is added to the power system of the lifting system, in actual application, the hydraulic motor group 101 can be controlled to provide power torque or resistance torque according to the change of the load 43 during the operation of the lifting system, so as to balance the changes caused by the load 43 The unbalanced gravity of the lifting movement pair reduces the power and electrical energy requirements of the power source 20, and at the same time ensures the stability of the lifting system.
[0048] It can be understood that the lifting motion pair of the lifting system includes a load 43. When a fixed counterweight 44 is provided, it also includes a fixed counterweight 44 and a driving rope 42 connecting the fixed counterweight 44 and the load 43.
[0049] At the same time, the installation of the first liquid storage device 102 and the second liquid storage device 103 is not restricted by factors such as the height of the application environment of the lifting system, and can be set according to actual conditions, which is convenient for application.
[0050] Further, the reversing component also has a third working position, which is located in the third working position. Both the first pipeline 104 and the second pipeline 105 are in a non-conducting state, that is, the hydraulic power system 10 is not working.
[0051] In a specific solution, both the first liquid storage device 102 and the second liquid storage device 103 include more than one liquid storage tank.
[0052] When two or more liquid storage tanks are provided for each liquid storage device, the heights of the liquid storage tanks of the first liquid storage device 102 need not be the same, and similarly, the heights of the liquid storage tanks of the second liquid storage device 103 need not be the same. In this way, it is convenient for the flexible arrangement of the liquid storage tank. However, it can be understood that the liquid storage tank of the first liquid storage device 102 and the corresponding liquid storage tank of the second liquid storage device 103 should have a height difference, so that the potential energy of the liquid and the mechanical energy can be converted into each other, so as to realize the hydraulic power system 10 Power torque output or resistance torque output.
[0053] In a specific solution, the hydraulic motor group 101 includes more than two hydraulic motors 111, and each hydraulic motor 111 is arranged in parallel.
[0054] figure 1 In the solution shown, the first liquid storage device 102 and the second liquid storage device 103 are each provided with only one liquid storage tank, and the hydraulic motor group 101 is specifically three hydraulic motors 111 arranged in parallel. It should be noted that, figure 1 What is shown is only a simple illustration of each component, and does not indicate the actual structure. This example will be detailed below.
[0055] figure 1 In the embodiment shown, the first pipeline 104 includes three first sub-pipes 141. One end of the three first sub-pipes 141 is connected to the first liquid storage device 102, and the other end is respectively connected to the first ports of the three hydraulic motors 111. The second pipeline 105 includes three second sub-pipes 151, one end of the three second sub-pipes 151 is connected to the second liquid storage device 103, and the other end is respectively connected to the second ports of the three hydraulic motors 111.
[0056] On this basis, the reversing component specifically includes three reversing valve groups 106, the reversing valve group 106 includes more than one reversing valve, each reversing valve group 106 is used to switch the working mode of the corresponding hydraulic motor 111, In other words, each hydraulic motor 111 can be independently controlled. In practical applications, the reversing valve of the reversing valve group 106 can be an electronically controlled reversing valve to communicate with the controller of the lifting system to realize automatic control.
[0057] In practical applications, the hydraulic motor group 101 may also be provided with only one hydraulic motor 111, or with more hydraulic motors 111, and each hydraulic motor 111 may have a single-cylinder structure or a multi-cylinder structure, or other structures; According to the specific selection of the hydraulic motor 111, the structure of the reversing valve group 106 corresponding to each hydraulic motor 111 can be set according to needs, so that the flow rate of the hydraulic motor group 101 can be adjusted as needed, and the output torque of the hydraulic motor 111 can be accurately determined. Control and avoid energy waste.
[0058] Specifically, the number of reversing valves of the reversing valve group 106 is related to the number of power channels of the corresponding hydraulic motor 111, so that each power channel of the hydraulic motor 111 can be independently controlled, and the work of each reversing valve can be switched according to demand. It adjusts the switch status and the number of openings of the power channels of each hydraulic motor 111, so that the hydraulic motor group 101 generates the required torque and output power.
[0059] The controller of the lifting system is used to switch the working positions of the reversing components according to the operating information of the lifting system, so that the hydraulic motor group 101 forms a balance torque to balance the gravity imbalance of the lifting motion pair. In other words, in actual control, the torque generated by the hydraulic power system 10 is only used to balance the gravity imbalance of the lifting movement pair. Among them, the operating information of the lifting system includes the operating direction of the load 43 and the difference between the weight of the load 43 and the fixed pair 44.
[0060] In this way, the arrangement of the hydraulic power system 10 can be considered as a supplement to the fixed counterweight 44, and it can be understood that the hydraulic power system 10 and the fixed counterweight 44 together constitute a dynamically adjustable counterweight.
[0061] Specifically, the controller of the lifting system can pre-store the relevant information of the hydraulic power system 10, including the liquid level difference between the first liquid storage device 102 and the second liquid storage device 103, the number of hydraulic motors 111 in the hydraulic motor group 101, and each hydraulic Related parameters of the motor 111, etc.; in application, the controller can obtain the magnitude of the load imbalance and the running direction of the load 43, and thereby control the number of hydraulic motors 111 actually participating in the work, so that the hydraulic power system 10 is only used for balance The torque of the unbalanced torque of the elevator movement pair.
[0062] It is not difficult to understand that the direction of the unbalanced torque of the lifting motion pair is related to the direction of movement. figure 2 The diagram briefly explains the working principle of the hydraulic power system 10 in each operating state of the lifting system.
[0063] When the gravity of the lifting motion pair is unbalanced and the weight m1 on the side of the load 43 is greater than the weight m2 on the side of the fixed counterweight 44, figure 2 In the state shown, the counterclockwise torque will be generated due to the gravity deviation of the lifting motion pair. At this time, the hydraulic power system 10 is controlled to provide clockwise torque to balance the aforementioned counterclockwise torque. When the lifting system is running, the output torque M of the power source 20 in1 It is used to overcome the dynamic force and moment, and the potential energy conversion of the liquid storage device balances the potential energy change of the lifting motion pair.
[0064] Under the above conditions, if the load 43 of the lifting system moves upwards, the potential energy of the lifting movement is increased, and the reversing component of the hydraulic power system 10 should be switched to the first working position, so that the hydraulic motor group 101 works in the motor mode, and the output torque M in2 For power torque, the potential energy of the hydraulic power system 10 is reduced; if the load 43 of the lifting system runs downward, the potential energy of the lifting movement is reduced, and the reversing component of the hydraulic power system 10 should be switched to the second working position to make the hydraulic motor Group 101 works in pump mode, output torque M in2 To resist torque, the potential energy of the hydraulic power system 10 is increased.
[0065] When the gravity of the lifting motion pair is unbalanced and the gravity m1 on the side where the load 43 is located is less than the weight m2 on the side where the fixed counterweight 44 is located, figure 2 In the state shown, the counterclockwise torque will be generated due to the gravity deviation of the lifting motion pair. At this time, the hydraulic power system 10 is controlled to provide counterclockwise torque to balance the aforementioned clockwise torque. When the lifting system is running, the output torque M of the power source 20 in1 It is used to overcome the dynamic force and moment, and the potential energy conversion of the liquid storage device balances the potential energy change of the lifting motion pair.
[0066] Under the above conditions, if the load 43 of the lifting system runs upwards, the potential energy of the lifting movement is reduced, and the reversing component of the hydraulic power system 10 should be switched to the second working position, so that the hydraulic motor group 101 works in the pump mode, and the output torque M in2 For the resistance torque, the potential energy of the hydraulic power system 10 increases; if the load 43 of the lifting system runs downwards, the potential energy of the lifting movement is increased. The reversing components of the hydraulic power system 10 should be switched to the first working position to make the hydraulic motor group 101 Working in motor mode, output torque M in2 For power torque, the potential energy of the hydraulic power system 10 is reduced.
[0067] Please refer to image 3 , image 3 It shows a schematic structural diagram of a first embodiment in which the above-mentioned hydraulic power system 10 is applied to a lifting system.
[0068] Such as image 3 As shown, the lifting system does not have a fixed counterweight. In practical applications, the lifting system can be an escalator. The hydraulic power system 10 and the power source 20 are connected to the same transmission speed changing mechanism 31, and the driving speed changing mechanism 31 is connected to the driving wheel. 41 Transmission connection. When the lifting system is an escalator, the power source 20 can be a traction motor, and the driving wheel 41 can be a traction wheel.
[0069] Please refer to Figure 4 , Figure 4 It shows a schematic structural diagram of a second embodiment in which the above-mentioned hydraulic power system 10 is applied to a lifting system.
[0070] Such as Figure 4 As shown, the lifting system is provided with a fixed counterweight 44. In practical applications, the lifting system can be a straight ladder. The fixed counterweight 44 and the load 43 are provided on both sides of the driving wheel 41 through a drive rope 42. In the illustrated solution, The hydraulic power system 10 and the power source 20 are also drivingly connected to the same transmission speed change mechanism 31.
[0071] When the lifting system is a straight elevator, the load 43 specifically includes a car and passengers or carrying goods. Similarly, the power source 20 can be a traction motor, and the driving wheel 41 can be a traction wheel.
[0072] Please refer to Figure 5 , Figure 5 A schematic structural diagram of a third embodiment in which the hydraulic power system 10 described above is applied to a lifting system is shown.
[0073] Such as Figure 5 As shown, the lifting system is also provided with a fixed counterweight 44, and the fixed counterweight 44 and the load 43 are provided on both sides of the driving wheel 41 through a drive rope 42. In the illustrated solution, the hydraulic power system 10 is driven by a transmission transmission mechanism 31 The wheels 41 are in transmission connection, and the power source 20 is in transmission connection with the driving wheels 41 through the speed change device 32.
[0074] Specifically, the lifting system is provided with two driving wheels 41, the driving rope 42 is passed through the two driving wheels 41 in turn, the hydraulic power system 10 is drivingly connected to one of the driving wheels 41, and the power source 20 is drivingly connected to the other driving wheel 41 This facilitates the flexible arrangement of the hydraulic power system 10. The lifting system can also be a straight ladder.
[0075] The above-mentioned escalators and vertical elevators belong to the same elevator system. Applying the aforementioned hydraulic power system to the elevator system can dynamically adjust the counterweight, and the traction torque of the traction motor can be effectively converted into motion force, which improves the comfort of passengers.
[0076] The hydraulic power system for the variable counterweight and the lifting system with the hydraulic power system provided by the present invention have been introduced in detail above. Specific examples are used in this article to illustrate the principle and implementation of the present invention. The description of the above examples is only used to help understand the method and core idea of the present invention. It should be pointed out that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.
