Hydraulic control system of elevator

Abstract

The utility model discloses a hydraulic control system of an elevator, which comprises a plunger cylinder, a motor pump set, an ascending control unit, a descending control unit and a manual emergency unit, and the ascending control unit comprises a first pressure compensation valve, a first proportional flow valve and a first one-way valve; the descending control unit comprises a second pressure compensation valve, a second proportional flow valve and a second one-way valve; the manual emergency unit comprises a manual pump set, a first overflow valve and a manual reversing valve, the manual pump set is connected with the plunger type cylinder, the manual reversing valve is connected with the plunger type cylinder, the first overflow valve is connected with the manual reversing valve, and the first overflow valve is communicated with the oil tank. Therefore, the running speed of the elevator cannot be changed along with the change of the load, and the proportional flow valve can regulate and control the running speed of the elevator; and by arranging the manual emergency unit, it can be guaranteed that the elevator safely ascends to the target position or descends to the target position in an emergency.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulic systems, in particular to a hydraulic control system for an elevator. Background Art

[0002] Elevators are special equipment that have very high requirements for operational stability, reliability, and safety. The existing elevator hydraulic control system has the following problems:

[0003] (1) Elevators are subject to loads of varying weights when in use. Existing elevator hydraulic control systems use a throttle valve with a fixed opening to control the elevator's operating speed, which can easily lead to unstable elevator operation and produce large vibrations when the elevator stops.

[0004] (2) When the elevator runs quickly, the rapid flow of oil will produce a lot of noise.

[0005] (3) When the motor pump unit fails, the elevator position is difficult to adjust and maintenance is inconvenient.

[0006] (4) When there is a sudden power outage, the elevator stops at a certain position and cannot move up or down, making it inconvenient for people to escape and for equipment maintenance. Utility Model Content

[0007] In order to solve one of the technical problems existing in the prior art, the utility model provides a hydraulic control system of an elevator, which can ensure that the running speed of the elevator will not change due to changes in load weight, which is beneficial to improving the stability of the elevator operation.

[0008] The technical solution adopted by the utility model to solve its technical problems is: a hydraulic control system of an elevator, comprising: a plunger cylinder, the plunger cylinder is used to drive the elevator to rise or fall; a motor pump group, the motor pump group is used to provide hydraulic power for the plunger cylinder; an ascending control unit, one end of the ascending control unit is connected to the motor pump group, and the other end of the ascending control unit is connected to the plunger cylinder; the ascending control unit comprises: a first pressure compensating valve, a first proportional flow valve and a first non-return valve, the oil circuit 1 of the first pressure compensating valve is connected to the inlet of the first proportional flow valve, the oil circuit 2 of the first pressure compensating valve is connected to the outlet of the first proportional flow valve, and the first proportional flow valve is connected to the first non-return valve; a descending control unit, one end of the descending control unit is connected to the motor pump group, and the other end of the ascending control unit is connected to the plunger cylinder; the ascending control unit comprises: a first pressure compensating valve, a first proportional flow valve and a first non-return valve, the oil circuit 1 of the first pressure compensating valve is connected to the inlet of the first proportional flow valve, the oil circuit 2 of the first pressure compensating valve is connected to the outlet of the first proportional flow valve, and the first proportional flow valve is connected to the first non-return valve; The elevator is connected to an oil tank, and the other end of the descent control unit is connected to the plunger cylinder; the descent control unit includes: a second pressure compensating valve, a second proportional flow valve and a second one-way valve, the oil circuit 1 of the second pressure compensating valve is connected to the inlet of the second proportional flow valve, the oil circuit 2 of the second pressure compensating valve is connected to the outlet of the second proportional flow valve, and the second proportional flow valve is connected to the second one-way valve; a manual emergency unit includes: a manual pump group, a first overflow valve and a manual reversing valve, the manual pump group is connected to the plunger cylinder, the manual reversing valve is connected to the plunger cylinder, the first overflow valve is connected to the manual reversing valve, and the first overflow valve is connected to the oil tank; the manual pump group is used to manually control the elevator to rise, and the manual reversing valve is used to manually control the elevator to descend.

[0009] Furthermore, one end of the ascending control unit and the descending control unit are both connected to the second pressure sensor; the other end of the ascending control unit and the descending control unit are both connected to the first pressure sensor.

[0010] Furthermore, it also includes: a first hydraulically controlled one-way valve, a second hydraulically controlled one-way valve, a first electromagnetic reversing valve and a second electromagnetic reversing valve, the first hydraulically controlled one-way valve and the second hydraulically controlled one-way valve are connected in series, the first hydraulically controlled one-way valve is connected to the rising control unit and the descending control unit, the second hydraulically controlled one-way valve is connected to the plunger cylinder, the first electromagnetic reversing valve is connected to the first hydraulically controlled one-way valve, and the second electromagnetic reversing valve is connected to the second hydraulically controlled one-way valve.

[0011] Furthermore, it also includes: a muffler, which is connected between the second hydraulically controlled one-way valve and the plunger cylinder.

[0012] Furthermore, it also includes: an explosion-proof valve, which is connected to the plunger cylinder.

[0013] Furthermore, it also includes: a third pressure sensor, and the third pressure sensor is connected to the plunger cylinder.

[0014] Furthermore, it also includes: a second overflow valve, wherein the second overflow valve is connected to the motor pump group.

[0015] The beneficial effects of the utility model are:

[0016] In the ascending control unit and the descending control unit, the pressure compensating valve and the proportional flow valve are connected in series, the oil circuit 1 of the pressure compensating valve is connected with the inlet of the proportional flow valve, and the oil circuit 2 of the pressure compensating valve is connected with the outlet of the proportional flow valve. In this way, the pressure difference between the inlet and outlet of the proportional flow valve is kept constant, so that the elevator running speed will not change due to changes in load, and the proportional flow valve can regulate the elevator movement speed, which can improve the stability of the elevator operation and the transmission efficiency.

[0017] The noise caused by the rapid flow of oil can be reduced by installing a muffler.

[0018] By setting up a manual emergency unit, the elevator can be guaranteed to rise to or descend to the target position safely in case of an emergency.

[0019] Safety can be improved by connecting two hydraulically controlled one-way valves in series. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0021] Figure 1 It is a schematic diagram of the hydraulic control system of the elevator of the utility model.

[0022] In the figure: 1. plunger cylinder; 2. motor pump group; 3. rising control unit; 4. descending control unit; 5. first pressure sensor; 6. second pressure sensor; 8. muffler; 9. first overflow valve; 10. manual reversing valve; 11. explosion-proof valve; 12. third pressure sensor; 13. second overflow valve; 14. manual pump group; 31. first pressure compensation valve; 32. first proportional flow valve; 33. first check valve; 41. second pressure compensation valve; 42. second proportional flow valve; 43. second check valve; 71. first hydraulically controlled check valve; 72. second hydraulically controlled check valve; 73. first electromagnetic reversing valve; 74. second electromagnetic reversing valve. DETAILED DESCRIPTION

[0023] Now the utility model is further described in detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, which only illustrate the basic structure of the utility model in a schematic manner, and therefore only show the components related to the utility model.

[0024] In the description of the present utility model, it is necessary to understand that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, features defined as "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, unless otherwise specified, "multiple" means two or more.

[0025] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0026] like Figure 1As shown, the hydraulic control system of the elevator of the utility model comprises: a plunger cylinder 1, a motor pump group 2, an ascending control unit 3, a descending control unit 4 and a manual emergency unit. The plunger cylinder 1 is used to drive the elevator to ascend or descend. The motor pump group 2 is used to provide hydraulic power for the plunger cylinder 1. One end of the ascending control unit 3 is connected to the motor pump group 2, and the other end of the ascending control unit 3 is connected to the plunger cylinder 1. One end of the descending control unit 4 is connected to the oil tank, and the other end of the descending control unit 4 is connected to the plunger cylinder 1. The ascending control unit 3 comprises: a first pressure compensation valve 31, a first proportional flow valve 32 and a first check valve 33. The oil circuit 1 of the first pressure compensation valve 31 is connected to the inlet of the first proportional flow valve 32, the oil circuit 2 of the first pressure compensation valve 31 is connected to the outlet of the first proportional flow valve 32, and the first proportional flow valve 32 is connected to the first check valve 33. The descending control unit 4 includes: a second pressure compensating valve 41, a second proportional flow valve 42 and a second non-return valve 43. The oil circuit 1 of the second pressure compensating valve 41 is connected to the inlet of the second proportional flow valve 42, the oil circuit 2 of the second pressure compensating valve 41 is connected to the outlet of the second proportional flow valve 42, and the second proportional flow valve 42 is connected to the second non-return valve 43. The manual emergency unit includes: a manual pump group 14, a first relief valve 9 and a manual reversing valve 10. The manual pump group 14 is connected to the plunger cylinder 1, the manual reversing valve 10 is connected to the plunger cylinder 1, the first relief valve 9 is connected to the manual reversing valve 10, and the first relief valve 9 is connected to the oil tank; the manual pump group 14 is used to manually control the elevator to ascend, and the manual reversing valve 10 is used to manually control the elevator to descend.

[0027] That is to say, in the ascending control unit 3 and the descending control unit 4, the pressure compensation valve and the proportional flow valve are connected in series, the oil circuit 1 of the pressure compensation valve is connected to the inlet of the proportional flow valve, and the oil circuit 2 of the pressure compensation valve is connected to the outlet of the proportional flow valve, so that the pressure difference between the inlet and outlet of the proportional flow valve is a constant value, so that the elevator running speed will not change due to the change of load, and the proportional flow valve can regulate the elevator movement speed, which can improve the stability and transmission efficiency of the elevator operation. By setting a manual emergency unit, the elevator can be safely ascended to the target position or descended to the target position in an emergency (power outage or motor pump group 2 failure). When the elevator is operating normally, the motor pump group 2 draws hydraulic oil from the oil tank to provide power for the elevator to ascend. The second relief valve 13 is a proportional relief valve. When the elevator is ascending, the second relief valve 13 can input different pressures according to the elevator load and ascending speed; when the elevator is descending, the second relief valve 13 can set different back pressures according to the elevator load and descending speed. When the elevator fails or the motor pump group 2 fails, the manual pump group 22 can be used to provide power to the plunger cylinder 1 to adjust the elevator to a safe position. When the elevator fails, the pressure of the first relief valve 9 can be adjusted according to the pressure value fed back by the third pressure sensor 12 to open the manual reversing valve 10, and the elevator can be lowered to a safe position.

[0028] Specifically, one end of the rising control unit 3 and the falling control unit 4 are connected to the second pressure sensor 6; the other end of the rising control unit 3 and the falling control unit 4 are connected to the first pressure sensor 5. The plunger cylinder 1 is connected to the third pressure sensor 12. The third pressure sensor 6 is used to monitor the pressure of the plunger cylinder 1, and the pressure signal determines the input value of the first proportional flow valve 32 and the second proportional flow valve 42. The second pressure sensor 6 and the first pressure sensor 5 are used to monitor the pressure at the front and rear ends of the proportional flow valve, and the pressure signal is used to adjust the opening of the proportional flow valve.

[0029] Specifically, the hydraulic control system further includes: a first hydraulically controlled one-way valve 71, a second hydraulically controlled one-way valve 72, a first electromagnetic reversing valve 73, and a second electromagnetic reversing valve 74. The first hydraulically controlled one-way valve 71 and the second hydraulically controlled one-way valve 72 are connected in series. The first hydraulically controlled one-way valve 71 is connected to the ascending control unit 3 and the descending control unit 4. The second hydraulically controlled one-way valve 72 is connected to the plunger cylinder 1. The first electromagnetic reversing valve 73 is connected to the first hydraulically controlled one-way valve 71, and the second electromagnetic reversing valve 74 is connected to the second hydraulically controlled one-way valve 72. When the first electromagnetic reversing valve 73 and the second electromagnetic reversing valve 74 lose power, the conduction direction of the first hydraulically controlled one-way valve 71 and the second hydraulically controlled one-way valve 72 is A→B. When the first electromagnetic reversing valve 73 and the second electromagnetic reversing valve 74 are powered, the conduction direction of the first hydraulically controlled one-way valve 71 and the second hydraulically controlled one-way valve 72 is B→A. When the elevator goes up, the oil flows in the direction of A→B, and when the elevator goes down, the oil flows in the direction of B→A. This embodiment uses two hydraulically controlled one-way valves, and when one of the hydraulically controlled one-way valves fails, the other hydraulically controlled one-way valve can still function to prevent the elevator from stalling when it goes down.

[0030] Specifically, the hydraulic control system further includes: a muffler 8, which is connected between the second hydraulically controlled one-way valve 72 and the plunger cylinder 1. The muffler 8 can reduce the noise caused by the rapid flow of oil. The hydraulic control system further includes: an explosion-proof valve 11, which is connected to the plunger cylinder 1. When the pipeline is broken, the explosion-proof valve 11 is closed, which can prevent the elevator from falling.

[0031] Specifically, the hydraulic control system further includes: a first relief valve 9 and a manual reversing valve 10, the manual reversing valve 10 is connected to the second hydraulically controlled one-way valve 72, the first relief valve 9 is connected to the manual reversing valve 10, and the first relief valve 9 is connected to the oil tank.

[0032] The working process of this hydraulic control system is introduced below.

[0033] When the elevator is rising normally:

[0034] The motor pump group 2 starts, and the given value of the first proportional flow valve 32 increases slowly from zero. The oil passes through the first pressure compensation valve 31, the first proportional flow valve 32, the first non-return valve 33, the first hydraulic non-return valve 71, the second hydraulic non-return valve 72, the muffler 8, and the explosion-proof valve 11 to reach the plunger cylinder 1. The oil pushes the piston of the plunger cylinder 1 to extend, and the elevator rises. The third pressure sensor 12 collects the pressure of the plunger cylinder 1 in real time. The first pressure sensor 5 is used to monitor the pressure at the outlet end of the first proportional flow valve 32, and the second pressure sensor 6 is used to monitor the pressure at the inlet end of the first proportional flow valve 32, so as to adjust the values ​​of the first proportional flow valve 32 and the second overflow valve 13, so that the elevator can rise at the desired speed while ensuring energy saving. When the elevator is about to reach the designated floor, the given value of the first proportional flow valve 32 gradually decreases to zero, and the elevator rise action is completed.

[0035] When the elevator descends normally:

[0036] The third pressure sensor 12 collects the pressure of the plunger cylinder 1, the first pressure sensor 5 collects the pressure at the inlet end of the second proportional flow valve 42, and the second pressure sensor 6 collects the pressure at the outlet end of the second proportional flow valve 42, and sets the initial value of the second overflow valve 13 and the second proportional flow valve 42. The first electromagnetic reversing valve 73 and the second electromagnetic reversing valve 74 are energized, and the oil in the plunger cylinder 1 passes through the explosion-proof valve 11, the muffler 8, the second hydraulically controlled one-way valve 72, the first hydraulically controlled one-way valve 71, the second pressure compensation valve 41, the second proportional flow valve 42, the second one-way valve 43, and the second overflow valve 13 in sequence to return to the oil tank, and the elevator descends. When the elevator is about to descend to the designated floor, the given value of the second proportional flow valve 42 gradually decreases to zero, the first electromagnetic reversing valve 73 and the second electromagnetic reversing valve 74 lose power, the second hydraulically controlled one-way valve 72 and the first hydraulically controlled one-way valve 71 are closed, and the elevator descending action is completed.

[0037] When the motor pump group 2 fails or the power is off, and the elevator still needs to rise:

[0038] The manual pump group 22 is manually operated, and the oil enters the plunger cylinder 1 through the muffler 8 and the explosion-proof valve 11 in sequence, and the elevator rises slowly. When the elevator reaches the target floor, the manual pump group 22 is stopped and the elevator stops rising.

[0039] When the motor pump group 2 fails or the power is off, and the elevator still needs to descend:

[0040] The third pressure sensor 12 collects the pressure of the plunger cylinder 1, adjusts the pressure value of the first relief valve 9 according to the pressure value, opens the manual reversing valve 10, and the oil in the plunger cylinder 1 returns to the oil tank through the explosion-proof valve 11, the muffler 8, the manual reversing valve 10, and the first relief valve 9 in sequence, and the elevator slowly descends. When the elevator descends to the target floor, it stops.

[0041] When a pipe ruptures:

[0042] The explosion-proof valve 11 is automatically closed, and the oil in the plunger cylinder 1 cannot flow out, ensuring that the elevator does not fall.

[0043] Based on the above ideal embodiments of the utility model, the relevant staff can make various changes and modifications without departing from the technical concept of the utility model through the above description. The technical scope of the utility model is not limited to the content of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A hydraulic control system for an elevator, characterized in that: include: A plunger cylinder (1), the plunger cylinder (1) is used to drive the elevator to rise or descend; A motor pump group (2), the motor pump group (2) is used to provide hydraulic power for the plunger cylinder (1); A lifting control unit (3), one end of the lifting control unit (3) is connected to the motor pump group (2), and the other end of the lifting control unit (3) is connected to the plunger cylinder (1); the lifting control unit (3) comprises: a first pressure compensation valve (31), a first proportional flow valve (32) and a first non-return valve (33); an oil circuit 1 of the first pressure compensation valve (31) is connected to an inlet of the first proportional flow valve (32), an oil circuit 2 of the first pressure compensation valve (31) is connected to an outlet of the first proportional flow valve (32), and the first proportional flow valve (32) is connected to the first non-return valve (33); A descending control unit (4), one end of the descending control unit (4) is connected to the oil tank, and the other end of the descending control unit (4) is connected to the plunger cylinder (1); the descending control unit (4) comprises: a second pressure compensation valve (41), a second proportional flow valve (42) and a second check valve (43); an oil circuit 1 of the second pressure compensation valve (41) is connected to an inlet of the second proportional flow valve (42), an oil circuit 2 of the second pressure compensation valve (41) is connected to an outlet of the second proportional flow valve (42), and the second proportional flow valve (42) is connected to the second check valve (43); A manual emergency unit comprises: a manual pump group (14), a first relief valve (9) and a manual reversing valve (10); the manual pump group (14) is connected to the plunger cylinder (1), the manual reversing valve (10) is connected to the plunger cylinder (1), the first relief valve (9) is connected to the manual reversing valve (10), and the first relief valve (9) is connected to an oil tank; the manual pump group (14) is used to manually control the elevator to ascend, and the manual reversing valve (10) is used to manually control the elevator to descend.

2. The hydraulic control system of an elevator according to claim 1, characterized in that: One end of the ascending control unit (3) and the descending control unit (4) are both connected to the second pressure sensor (6); the other ends of the ascending control unit (3) and the descending control unit (4) are both connected to the first pressure sensor (5).

3. The hydraulic control system of an elevator according to claim 1, characterized in that: Also includes: A first hydraulically controlled one-way valve (71), a second hydraulically controlled one-way valve (72), a first electromagnetic reversing valve (73) and a second electromagnetic reversing valve (74), wherein the first hydraulically controlled one-way valve (71) and the second hydraulically controlled one-way valve (72) are connected in series, the first hydraulically controlled one-way valve (71) is connected to the ascending control unit (3) and the descending control unit (4), the second hydraulically controlled one-way valve (72) is connected to the plunger cylinder (1), the first electromagnetic reversing valve (73) is connected to the first hydraulically controlled one-way valve (71), and the second electromagnetic reversing valve (74) is connected to the second hydraulically controlled one-way valve (72).

4. The hydraulic control system of an elevator according to claim 3, characterized in that: Also includes: A muffler (8), wherein the muffler (8) is connected between the second hydraulically controlled one-way valve (72) and the plunger cylinder (1).

5. The hydraulic control system of an elevator according to claim 1, characterized in that: Also includes: An explosion-proof valve (11), wherein the explosion-proof valve (11) is connected to the plunger cylinder (1).

6. The hydraulic control system of an elevator according to claim 1, characterized in that: Also includes: A third pressure sensor (12), the third pressure sensor (12) is connected to the plunger cylinder (1).

7. The hydraulic control system of an elevator according to claim 1, characterized in that: Also includes: A second overflow valve (13), wherein the second overflow valve (13) is connected to the motor pump assembly (2).

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