Lifting and descending valve group, lifting and descending system and empty container stacking machine

Abstract

The utility model belongs to the technical field of empty container stacking machines, and particularly relates to a lifting and descending valve group, a lifting and descending system and an empty container stacking machine, the lifting and descending valve group comprises a valve block, a P2 port of the valve block is connected in parallel with an A1 port and an A2 port of the valve block through a lifting oil way; a slide valve type logic valve is arranged on the lifting oil way, the lifting oil way at the downstream of the logic valve is connected with an oil inlet of a reversing valve through a first branch, and an oil outlet of the reversing valve is connected with a port D of the valve block; a P1 port of the valve block is in one-way connection with a lifting oil way on the downstream of the first branch, and a control cavity of the logic valve is connected with the first branch; the pipeline arrangement is simple, and the response speed is high; and when the P2 port of the valve block is blocked by return oil, the oil can flow to the D port of the valve block through the first branch to return oil so as to realize emergency descending, so that the purposes of high integration degree of the valve block and safe and stable work are achieved.

Description

Technical Field

[0001] This utility model belongs to the technical field of container empty container stackers, specifically relating to a lifting and lowering valve assembly, a lifting and lowering system, and a container empty container stacker. Background Technology

[0002] A container stacker is a port machine specifically designed for stacking and transporting empty containers. Typically, it can stack up to 7 or 8 layers high. Container stacking is achieved by raising and lowering the hydraulic cylinders of the stacker's gantry. Currently, traditional stacker gantry lifting systems...

[0003] Existing forklift gantry lifting systems have technical solutions that use dual pumps for oil supply, but they usually use external confluence valves, which leads to complex piping and delayed response. Furthermore, when the main oil line is blocked, there is no backup oil return path, which prevents the gantry from descending in an emergency, posing a potential hazard. Utility Model Content

[0004] To address the aforementioned issues, this invention provides a lifting and lowering valve assembly, a lifting and lowering system, and a container stacker. The valve block of the lifting and lowering valve assembly can be directly connected to the lifting cylinder and pump to form a lifting and lowering system, resulting in simple piping and fast response. Furthermore, the lifting and lowering system can return oil to the P2 port of the valve block via a logic valve for normal lowering, and can also return oil to the D port of the valve block via a first branch when the return oil to the P2 port of the valve block is blocked, thus achieving emergency lowering. This results in a high degree of valve block integration and safe and stable operation.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] In a first aspect, this utility model provides a lifting and lowering valve assembly, which includes a valve block. The P2 port of the valve block is connected in parallel to the A1 and A2 ports of the valve block through a lifting oil circuit. A logic valve is provided on the lifting oil circuit. The lifting oil circuit downstream of the logic valve is connected to the inlet of a reversing valve through a first branch. The outlet of the reversing valve is connected to the D port of the valve block. The P1 port of the valve block is unidirectionally connected to the lifting oil circuit downstream of the first branch. The control chamber of the logic valve is connected to the first branch.

[0007] The logic valve has a lift position and a lower position, and the directional valve has a stop position and a flow position. When the logic valve is in the lift position and the directional valve is in the stop position, the P2 port of the valve block can supply oil to the A1 and A2 ports of the valve block through the logic valve. When the logic valve is in the lower position and the directional valve is in the flow position, the A1 and A2 ports of the valve block can be connected to the P2 port of the valve block through the logic valve, and can also be connected to the D port of the valve block through the first branch and the directional valve.

[0008] Optionally, it also includes:

[0009] The overflow valve has its inlet connected to the lifting oil circuit downstream of the first branch, and its outlet connected to port D of the valve block.

[0010] Optionally, the logic valve is a slide valve.

[0011] Optionally, it also includes:

[0012] The second damping orifice is located between the control chamber of the logic valve and the first branch.

[0013] Optionally, it also includes:

[0014] The first damping orifice is located on the first branch upstream of the control chamber of the logic valve;

[0015] The third damping orifice is located on the first branch downstream of the control chamber of the logic valve.

[0016] Optionally, it also includes:

[0017] A one-way valve is located between the P1 port of the valve block and the lifting oil circuit downstream of the first branch.

[0018] Optionally, it also includes:

[0019] A pressure test connector is connected to the lifting oil circuit downstream of the first branch. The pressure test connector is used to test the pressure at ports A1 and A2 of the valve block.

[0020] Optionally, the reversing valve is a solenoid valve.

[0021] Secondly, this utility model provides a lifting and lowering system, which includes the aforementioned lifting and lowering valve assembly, and further includes:

[0022] The first hydraulic pump is connected to port P1 of the valve block;

[0023] The second hydraulic pump is connected to the P2 port of the valve block via a proportional valve. The proportional valve includes a first working position, a second working position, and a third working position. When the proportional valve is in the first working position, the oil outlet of the second hydraulic pump is connected to the P2 port of the valve block. When the proportional valve is in the second working position, the oil outlet of the second hydraulic pump is cut off from the P2 port of the valve block. When the proportional valve is in the third working position, the P2 port of the valve block is connected to the oil tank.

[0024] The first lifting cylinder and the second lifting cylinder are respectively connected to port A1 and port A2 of the valve block.

[0025] Thirdly, this utility model provides a container stacker, which includes the aforementioned lifting and lowering system.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] The lifting and lowering valve assembly of this invention connects ports P1, P2, A1, and A2 to the first hydraulic pump, the second hydraulic pump, the first lifting cylinder, and the second lifting cylinder, respectively, to form a lifting and lowering system applicable to container stackers. The valve block of the lifting and lowering valve assembly has a high degree of integration. Furthermore, the lifting and lowering actions can be adjusted by changing the working positions of the logic valve and the directional valve, resulting in a fast system response. In addition, under normal lowering conditions, the return oil from the lifting cylinder can flow through the logic valve to port P2 of the valve block for return oil. If the return oil at port P2 of the valve block becomes blocked, the return oil from the lifting cylinder can also flow through the first branch to port D of the valve block for emergency return oil. The two return oil paths of this invention ensure stable lowering operation of the lifting system and provide excellent emergency response capabilities. Attached Figure Description

[0028] like Figure 1 This is a schematic diagram of the lifting and lowering valve assembly in Example 1;

[0029] Figure 2 for Figure 1 Hydraulic schematic diagram of the lifting and lowering valve assembly.

[0030] Figure 3 This is a hydraulic schematic diagram of the lifting and lowering system in Example 2.

[0031] The following are the labels in the diagram: 1. Directional control valve; 2. Logic valve; 3. Relief valve; 4. Check valve; 5. Pressure test connector; 6. First damping orifice; 7. Second damping orifice; 8. Third damping orifice; 9. Proportional valve; 10. First lifting cylinder; 11. Second lifting cylinder; 12. Oil tank; 13. Lifting and lowering valve assembly. Detailed Implementation

[0032] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are used only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more. In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0033] The present invention will be further described below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and should not be used to limit the scope of protection of the present invention. Example 1

[0034] To make the purpose, technical solution and advantages of this utility model patent clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments.

[0035] Combination Figures 1 to 2 This embodiment provides a lifting and lowering valve assembly 13 for a gantry lifting system of a container empty stacker. The assembly includes a valve block with ports P1, P2, A1, A2, and D. Port P1 is used to connect to a first hydraulic pump with a smaller flow rate, used to combine with the hydraulic oil output from a second hydraulic pump for acceleration. Port P2 is used to connect to the second hydraulic pump, serving as the main oil supply pump. Ports A1 and A2 are used to connect to the rodless chambers of two lifting cylinders, respectively. Port D serves as a return port connected to the oil tank 12.

[0036] Specifically, the P2 port of the valve block is connected in parallel to the A1 and A2 ports of the valve block via a lifting oil circuit, which is represented as P2 port → A1 port / A2 port in the attached diagram. A slide valve-type logic valve 2 is provided on the lifting oil circuit. In this embodiment, the slide valve-type logic valve 2 allows the flow direction of the logic valve 2 to be adjusted to suit lifting and lowering operations. The lifting oil circuit downstream of the logic valve 2 is connected to the inlet of the reversing valve 1 via a first branch. The outlet of the reversing valve 1 is connected to the D port of the valve block. In this embodiment, the reversing valve 1 is a normally closed solenoid valve, which switches to the flow position when energized. The P1 port of the valve block is unidirectionally connected to the lifting oil circuit downstream of the first branch to achieve dual-pump confluence. The control chamber of the logic valve 2 is connected to the first branch for controlling chamber oil discharge.

[0037] The working principle of the lifting and lowering valve assembly 13 is explained as follows: The logic valve 2 has a lifting position and a lowering position, and the reversing valve 1 has a stop position and a flow position. When the logic valve 2 is in the lifting position and the reversing valve 1 is in the stop position, the P2 port of the valve block can supply oil to the A1 and A2 ports of the valve block through the logic valve 2, thereby realizing the lifting action. When the logic valve 2 is in the lowering position and the reversing valve 1 is in the flow position, the A1 and A2 ports of the valve block can be connected to the P2 port of the valve block through the logic valve 2, and can also be connected to the D port of the valve block through the first branch and the reversing valve 1. The purpose of this configuration in this embodiment is that, under normal lowering conditions, the return oil withdrawn from the lifting cylinder can flow through the logic valve 2 to the P2 port of the valve block for return oil to realize lowering. In a specific embodiment, the P2 port of the valve block can be connected to the proportional valve 9. By switching the valve core position of the proportional valve 9, the P2 port of the valve block can be connected to the second hydraulic pump or to the oil tank 12. If the return oil port P2 of the valve block is blocked, the reversing valve 1 in the flow position can open the first branch, and the return oil exiting the lifting cylinder can flow through the first branch and the reversing valve 1 to the D port of the valve block to return, thereby realizing emergency descent.

[0038] Furthermore, in some specific embodiments, the valve block also integrates an overflow valve 3 and a one-way valve 4. The inlet of the overflow valve 3 is connected to the lifting oil circuit downstream of the first branch, and the outlet of the overflow valve 3 is connected to port D of the valve block. The preload of the pressure regulating spring of the overflow valve 3 is set according to the maximum load of the gantry to protect the valve body. The one-way valve 4 is located between port P1 of the valve block and the lifting oil circuit. The one-way valve 4 allows unidirectional flow from port P1 to port A1 / A2, and blocks flow in the reverse direction. The lifting oil circuit downstream of the first branch is also connected to a pressure test connector 5. The pressure test connector 5 is used to test the pressure at ports A1 and A2 of the valve block during lifting operations to facilitate troubleshooting.

[0039] In addition, in some specific embodiments, the valve block is also provided with a first damping hole 6, a second damping hole 7 and a third damping hole 8.

[0040] The second damping orifice 7 is located between the control chamber of the logic valve 2 and the first branch. The functions of the second damping orifice 7 are twofold: firstly, to slow down the oil discharge rate of the control chamber of the logic valve 2, allowing the oil in the control chamber to slowly depressurize through the second damping orifice 7, thus enabling the valve core to open slowly and achieve a smooth load descent. This prevents the risk of "stall" caused by the rapid opening of the logic valve 2 valve core due to gravity when the load decreases. Secondly, the second damping orifice 7 forms a buffer zone in the control oil circuit of the logic valve 2 control chamber, absorbing pressure fluctuations generated when the logic valve 2 valve core switches. If the logic valve 2 valve core moves rapidly, a sudden interruption of the lifting oil circuit can cause inertial shocks (sudden pressure rise or fall) in the pipeline. The throttling effect of the second damping orifice 7 can slow down the rate of pressure change and reduce the impact pressure.

[0041] The first damping orifice 6 and the third damping orifice 8 are respectively located on the first branch upstream and downstream of the control chamber of the logic valve 2. The first damping orifice 6 can prevent pressure fluctuations in the hydraulic system (mainly the lifting oil circuit) from being transmitted to the control chamber of the logic valve 2, thereby acting as a filter and reducing the impact of system pressure fluctuations on the valve core position of the logic valve 2, thus avoiding malfunction of the valve core. The third damping orifice 8 can control the emergency return oil flow under emergency lowering conditions (hydraulic oil withdrawn from the lifting cylinder flows through the first branch to the D port of the valve block for return oil). Specifically, when the reversing valve 1 is switched to the flow position, the return oil from the A1 and A2 ports of the valve block flows through the first damping orifice 6 and the third damping orifice 8 through the reversing valve 1 to the D port of the valve block. The third damping orifice 8 can limit the emergency return oil flow, or adjust the return oil back pressure, thereby limiting the descent speed of the gantry within a safe range to prevent the gantry from falling uncontrollably and rapidly, thus improving the safety of the lifting system. Example 2

[0042] Combination Figure 3This embodiment provides a lifting and lowering system for a container stacker, including the lifting and lowering valve assembly 13 from Embodiment 1. The lifting and lowering system includes a first hydraulic pump, a second hydraulic pump, a proportional valve 9, a first lifting cylinder 10, and a second lifting cylinder 11. The first and second hydraulic pumps are respectively connected to ports P1 and P2 of the valve block of the lifting and lowering valve assembly 13, forming a dual-pump system that supplies oil in parallel. The first lifting cylinder 10 and the second lifting cylinder 11 are connected in parallel and operate synchronously through ports A1 and A2 of the valve block. Ports A1 and A2 of the valve block are respectively connected to the rodless chambers of the first lifting cylinder 10 and the second lifting cylinder 11. The proportional valve 9 is connected between the second hydraulic pump and the P2 port of the valve block. When the proportional valve 9 is in the first working position, the oil outlet of the second hydraulic pump is connected to the P2 port of the valve block, and the flow rate from the second hydraulic pump to the lifting and lowering valve assembly 13 is controlled by the size of the valve core opening. When the proportional valve 9 is in the second working position, the oil outlet of the second hydraulic pump is cut off from the P2 port of the valve block. When the proportional valve 9 is in the third working position, the P2 port of the valve block is connected to the oil tank 12 for oil return during the lowering operation. In this embodiment, both the proportional valve 9 and the directional valve 1 in the valve block are solenoid valves, which can be controlled by the output signal of the PLC or controller.

[0043] The working principles of the lifting and lowering system under lifting, normal lowering, and emergency lowering conditions will be explained.

[0044] Under lifting conditions: proportional valve 9 is energized in the left position and switches to the first working position, the second hydraulic pump ( Figure 3 The outlet of pump 2) is connected to port P2 of the valve block of the lifting and lowering valve assembly 13. Oil flows through proportional valve 9, sequentially through port P2 of the valve block, logic valve 2, and ports A1 / A2 of the valve block, into the rodless chamber of the lifting cylinder to achieve gantry lifting. Simultaneously, the first hydraulic pump ( Figure 3 The oil output from pump 1) passes sequentially through port P1 of the valve block, check valve 4, and merges with the oil from the second hydraulic pump in the lifting oil circuit before entering the rodless chamber of the lifting cylinder to achieve gantry lifting and accelerate the lifting speed. Check valve 4, installed between port P1 of the valve block and the lifting oil circuit, prevents high-pressure oil from back-impacting the first hydraulic pump. Relief valve 3 downstream of the first branch can monitor the pressure at ports A1 / A2 of the valve block in real time during lifting operations and can release pressure to port D of the valve block when the pressure exceeds a preset threshold.

[0045] Under normal descent conditions, the directional valve 1 is energized, and the control oil in the control chamber of the logic valve 2 is connected to the oil tank 12 through the valve block D port. The valve core of the logic valve 2 moves to the descent position. The oil in the rodless chamber of the lifting cylinder passes through the valve block A1 / A2 port, the logic valve 2, the valve block P2 port, and the proportional valve 9 (in the third working position) in sequence and returns to the oil tank 12, thereby realizing the gantry descent. By adjusting the valve core opening of the proportional valve 9, the return oil back pressure can be controlled to adjust the descent speed of the gantry.

[0046] In emergency descent conditions, if an emergency occurs that prevents the proportional valve 9 from opening, thus preventing the oil from flowing into the oil tank 12 at port P2, the reversing valve 1 will be energized and switched to the flow position. The oil exiting the rodless chamber of the lifting cylinder can still flow back to the oil tank 12 through the first throttle orifice, the second throttle orifice, and port D of the valve block. At this time, the descent speed of the gantry is about 1% to 5% of that under normal descent conditions, so as to achieve emergency safe descent. Example 3

[0047] Based on the same inventive concept as Embodiment 1, this embodiment provides a container stacker, which includes the lifting and lowering system described in Embodiment 1.

[0048] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A lift lower valve group characterized by, The valve block is provided with P2 port, A1 port and A2 port, P2 port is connected with A1 port and A2 port through lifting oil way, and logic valve (2) is arranged on the lifting oil way, the lifting oil way downstream of the logic valve (2) is connected with the oil inlet of reversing valve (1) through first branch, the oil outlet of the reversing valve (1) is connected with D port of the valve block, and P1 port of the valve block is connected with the lifting oil way downstream of the first branch in a one-way manner. The logic valve (2) has lifting position and lowering position, and the reversing valve (1) has cut-off position and flow-through position, when the logic valve (2) is in the lifting position and the reversing valve (1) is in the cut-off position, P2 port of the valve block can supply oil to A1 port and A2 port of the valve block through the logic valve (2), and when the logic valve (2) is in the lowering position and the reversing valve (1) is in the flow-through position, A1 port and A2 port of the valve block can be connected with P2 port of the valve block through the logic valve (2), and can also be connected with D port of the valve block through the first branch and the reversing valve (1).

2. The raise and lower valve group of claim 1, wherein, Further comprising: Overflow valve (3) is arranged, the oil inlet is connected with the lifting oil way downstream of the first branch, and the oil outlet is connected with D port of the valve block.

3. The raise and lower valve group of claim 1, wherein, The logic valve (2) is a spool type.

4. The raise and lower valve group of claim 1, wherein, Further comprising: Second damping hole (7) is arranged between the control cavity of the logic valve (2) and the first branch.

5. The raise and lower valve group of claim 1, wherein, Further comprising: First damping hole (6) is arranged on the first branch upstream of the control cavity of the logic valve (2); Third damping hole (8) is arranged on the first branch downstream of the control cavity of the logic valve (2).

6. The raise and lower valve group of claim 1, wherein, Further comprising: One-way valve (4) is arranged between P1 port of the valve block and the lifting oil way downstream of the first branch.

7. The raise and lower valve group of claim 1, wherein, Further comprising: Pressure measuring connector (5) is connected with the lifting oil way downstream of the first branch, and the pressure measuring connector (5) is used for testing the pressure of A1 port and A2 port of the valve block.

8. The raise and lower valve group of claim 1, wherein, The reversing valve (1) is an electromagnetic valve.

9. A lifting lowering system, characterized in that The lifting and lowering valve group of any one of claims 1-8 further comprises: First hydraulic pump is connected with P1 port of the valve block; Second hydraulic pump is connected with P2 port of the valve block through proportional valve (9), the proportional valve (9) comprises first working position, second working position and third working position, when the proportional valve (9) is in the first working position, the oil outlet of the second hydraulic pump is communicated with P2 port of the valve block, when the proportional valve (9) is in the second working position, the oil outlet of the second hydraulic pump is cut off with P2 port of the valve block, and when the proportional valve (9) is in the third working position, P2 port of the valve block is connected with oil tank (12); First lifting oil cylinder (10) and second lifting oil cylinder (11) are connected with A1 port and A2 port of the valve block respectively.

10. A container empty container stacker characterized by The lifting and lowering system of claim 9 is provided.

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