Energy saving improved type hydraulic reverse booster

Abstract

To provide energy-saving type hydraulic equipment that cuts down on energy required for lifting and lowering an article or the like by reducing force required for actuating a hydraulic jack, etc.SOLUTION: Three hydraulic cylinders 1, 2, and 3, a spring 4, a connection rod 5, etc. for interlocking a piston rod are formed into a unit. The spring 4 and one hydraulic cylinder 2 are incorporated to apply force in a direction to push back the piston rod of the two hydraulic cylinders 1 and 3. A hydraulic circuit is assembled through a selector valve and an on-off valve. An operation system of existing hydraulic equipment can be switched between forward and reverse operations by applying hydraulic pressure to a hydraulic jack 8, etc. on a secondary side when hydraulic pressure is generated on a primary side by a hydraulic pump 7 or, conversely, removing the hydraulic pressure.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to hydraulic equipment and mechanisms that apply hydraulic pressure to hydraulic equipment and the like to operate them. [Background technology]

[0002] In conventional hydraulic systems, hydraulic equipment such as hydraulic jacks and hydraulic cylinders generally work in such a way that when hydraulic pressure is generated by a hydraulic pump on the primary side, the hydraulic pressure in the equipment on the secondary side rises, causing it to lift an object, and when the hydraulic pressure on the primary side is lowered by a relief valve, the hydraulic pressure in the equipment on the secondary side also drops, causing it to lower the lifted object. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 7156752 Public Relations [Patent Document 2] Patent No. 7185373 Public Relations [Non-patent literature]

[0004] [Non-Patent Document 1] none Summary of the Invention [Problem to be solved by the invention]

[0005] In a conventional hydraulic system, if an object is lifted with a hydraulic jack or the like and hydraulic pressure is released by mistakenly operating the hydraulic pump relief valve while working underneath it, the object may fall, causing an accident in which the worker is crushed or has their limbs trapped underneath.

[0006] In addition, the force required to lift an object in a hydraulic jack or similar device must be generated by a hydraulic pump to generate the force necessary to lift the object's entire weight. Also, when the hydraulic pressure is released and the object is lowered, the energy generated to lift the object up to that point is lost, and the energy necessary to lift the object's entire weight must be generated each time the object is raised or lowered.

[0007] In order to solve the above problems, the hydraulic reverse booster of Patent Document 1: The main components of this unit are two hydraulic cylinders, a spring, a connecting rod to link the piston rods of the hydraulic cylinders, and a frame to attach them together. A spring is installed so that it applies force in the direction of pushing back the piston rod of the hydraulic cylinder, and one hydraulic cylinder is connected to a hydraulic pump, while the other hydraulic cylinder is connected to a hydraulic jack or the like. When the relief valve of the hydraulic pump is opened, the oil pressure in the hydraulic cylinder drops, and the force of the spring generates oil pressure from the other hydraulic cylinder, which pressurizes the hydraulic jack or the like. Conversely, when oil pressure is generated by the hydraulic pump, the hydraulic cylinder compresses the spring, lowering the oil pressure generated in the other hydraulic cylinder. This is a device that reverses the operating system of existing hydraulic equipment, but in the case of the mechanism of this device, to increase the oil pressure of the secondary hydraulic jack or the like, the oil pressure is released from the hydraulic pump on the primary side and the oil pressure is increased using only the force of the spring.

[0008] The present invention aims to prevent crushing accidents by preventing the object being lifted from falling and crushing the user even if the hydraulic pressure is released due to an erroneous operation of the hydraulic pump's relief valve, without changing or modifying the mechanism of the hydraulic equipment itself that is being driven, and by significantly reducing the force required to operate it compared to conventional hydraulic equipment, thereby reducing the energy required to raise and lower loads.The hydraulic reverse booster of Patent Document 1 is an energy-saving hydraulic device that reduces the energy required to raise and lower loads, and also adds the function of a conventional hydraulic system in which the secondary hydraulic pressure increases when the primary hydraulic pressure is increased, allowing operation by switching between forward and reverse, making it even easier to use and more energy-saving. [Means for solving the problem]

[0009] The means for solving the above problem is to incorporate two hydraulic cylinders in the hydraulic reverse booster of Patent Document 1 so that a force is applied in the direction that compresses the spring, and to incorporate another hydraulic cylinder so that a force is applied in the opposite direction so that the piston rod extends the spring. When hydraulic pressure is generated on the primary side by a hydraulic pump via a switching valve, hydraulic pressure is applied to or released from a hydraulic jack or the like on the secondary side, and functions have been added and improved so that the operating system of existing hydraulic equipment can be switched between forward and reverse operation. [Effects of the Invention]

[0010] In addition to the system that reverses the operating system of hydraulic equipment, functions have been added and improved so that normal operating systems can also be used.By doing so, when used in lifting devices such as hydraulic lifts, the height at which the spring force and the weight of the load are balanced had to be set at the highest point of the lifting height in the hydraulic reverse booster of Patent Document 1, but it can now be set to near the middle of the lifting height, and the load can be lifted from the bottom to the balanced height by releasing the hydraulic pressure on the primary side, and can be lifted further up by combining the spring force with a slight hydraulic pressure generated by the pump.When lowering, conversely, if the hydraulic pressure on the primary side is released, the load will fall under its own weight to the balanced height, and can be lowered further down by generating hydraulic pressure with the pump just enough to offset the spring force and the weight of the load, making it even easier to use and enabling greater energy savings. [Brief explanation of the drawings]

[0011] [Figure 1] FIG. 1 is a perspective view showing an example of a hydraulic device according to the present invention. [Figure 2] A diagram showing an example of application in which a hydraulic circuit is added in parallel to the equipment in Figure 1 [Figure 3] A side view showing an example of how this device can be connected to an existing hydraulic lift to raise the loading platform in the event of flooding. [Figure 4] A perspective view showing an example of equipment in which the hydraulic cylinders (1) and (3) are replaced with one double-acting hydraulic cylinder (15). [Figure 5] A diagram showing an application example in which a hydraulic circuit is added in parallel to the equipment in Figure 4 DETAILED DESCRIPTION OF THE INVENTION [Example]

[0012] 1 and 2 show an example of an embodiment of the present invention. The main components of the overall configuration are three hydraulic cylinders (1), (2), and (3), a compression spring (4), a connecting rod (5) for linking the piston rods (1a) and (2a) of the hydraulic cylinders (1) and (2), a frame (6) for assembling them, and a switching valve (12) and opening / closing valves (13) and (14) for connecting the hydraulic cylinders (1), (2), and (3) to an existing hydraulic pump (7), an existing hydraulic jack (8), etc.

[0013] The hydraulic cylinder (1) is connected to the existing hydraulic pump (7) via a switching valve (12), and the existing hydraulic jack (8) is pushed out by the hydraulic pressure generated by the force of the compression spring (4). By closing the hydraulic circuit, the piston rod (1a) cannot move, acting as a brake and stopping the operation of the hydraulic jack (8). When the relief valve (7a) of the hydraulic pump (7) is opened, the hydraulic circuit opens, the piston rod (1a) can move, the brake is released, and the hydraulic jack (8) is operated and pushed out by the force of the compression spring (4). When it is desired to release the hydraulic pressure of the hydraulic jack (8), the hydraulic cylinder (1) generates hydraulic pressure using the hydraulic pump (7), pushes out the piston rod (1a), and moves the holder plate (4a) while compressing the compression spring (4) using the connecting rod (5) and the connecting plate (5a), thereby releasing the force applied to the piston rod (2a) of the hydraulic cylinder (2) and releasing the hydraulic pressure of the hydraulic jack (8).

[0014] The hydraulic cylinder (2) is connected to a hydraulic jack (8), and the piston rod (2a) can be moved in synchronization with the piston rod (1a) of the hydraulic cylinder (1) by means of an integrated holder plate (4a), connecting rod (5), and connecting plate (5a). When the hydraulic pressure in the hydraulic cylinder (1) is released, the piston rod (1a) becomes movable, and the piston rod (2a) of the hydraulic cylinder (2) is pushed back by the force of the compression spring (4), thereby applying hydraulic pressure to the hydraulic jack (8).

[0015] The hydraulic cylinder (3) is connected to an existing hydraulic pump (7) via a switching valve (12), and the hydraulic pressure generated by the hydraulic pump (7) pushes the piston, which, combined with the force of the compression spring (4), pushes the piston rod (2a) of the hydraulic cylinder (2), thereby applying hydraulic pressure to the hydraulic jack (8).

[0016] The hydraulic cylinders (1), (2), and (3) are assembled with capacities such as area and stroke that are large enough to supply hydraulic oil according to the capacity of the hydraulic jack (8) to be driven. The two hydraulic cylinders (1) and (3) can also be replaced with one reciprocating hydraulic cylinder (15), which can have the same function whether it is installed on the hydraulic cylinder (1) or (3) side. In particular, when it is installed on the hydraulic cylinder (3) side, the connecting rod (5) and connecting plate (5a) can be omitted. 4 and 5 show an application example of the above case.

[0017] The compression springs (4) are assembled in a number of pieces with a strength that provides hydraulic pressure to the hydraulic jack (8) to generate thrust in accordance with the thrust of the existing hydraulic jack (8) to be connected.

[0018] The hydraulic cylinders (1), (2), and (3) are fixed to the frame (6), and the frame (6) also receives the reaction force of the compression spring (4).

[0019] The spring load adjustment screw (9) changes the relative position of the holder plate (4a) and the frame (6) to change the initial load of the compression spring (4), thereby adjusting the hydraulic pressure applied from the hydraulic cylinder (2) and the thrust that the hydraulic jack (8) can generate.

[0020] Using the function to adjust the hydraulic pressure applied from this hydraulic cylinder (2), for example, when using the hydraulic jack (8) to repeatedly raise and lower an object weighing 1.0 ton, by setting the weight that the loading platform can lift with the thrust that the hydraulic jack (8) can generate to 1.1 ton, the force required to raise and lower the hydraulic jack (8) only needs to be generated by the hydraulic pump (7) to generate a force slightly exceeding the load of 0.1 ton, which is the set thrust minus the weight of the object being lifted. Therefore, if a manual pump is used, the object can be raised and lowered easily with little force, and if an electric pump or the like is used, less power is consumed, resulting in significant energy savings compared to the energy required to lift an object with a conventional hydraulic jack.

[0021] Next, an example of the procedure for operating a lifting device such as a hydraulic lift will be shown using the circuit diagram in Figure 2. First, balance the average weight of the load that is normally lifted and lowered with the spring force, and set the balance weight as follows so that when the hydraulic pressure is released, a bed carrying a load of that average weight will rise to approximately the middle of the lifting height.

[0022] A load of average weight is placed on the platform of the hydraulic lift, the on-off valves (13) and (14) are opened, P of the switching valve (12) is set to the neutral closed position, and the hydraulic pump (7) is operated to raise the platform to about the middle of the lifting height. Then, the on-off valve (13) is closed, P of the switching valve (12) is set to the position connected to 1, and the hydraulic pump (7) is operated to lower the platform to the lowest point, completing the setting of the balance weight.

[0023] Next, in actual use, if the weight of the object placed on the platform is heavier than half of the set balance weight, by switching the P of the switching valve (12) to the connected position of 2, the platform will rise without power until the force of the spring and the weight of the loaded object are balanced, and by operating the hydraulic pump (7) further, it can be raised to any desired height or maximum point above that. When lowering the platform, switch the P of the switching valve (12) to the connected position 1, and the platform will lower under its own weight until the force of the spring and the weight of the load are balanced. If the hydraulic pump (7) is operated further, the platform can be lowered to the lowest point.

[0024] Furthermore, when the weight of the object placed on the platform is lighter than half the set balance weight, the on-off valve (14) is closed, the on-off valve (13) is opened, and P of the switching valve (12) is set to the neutral closed position to form a normal hydraulic circuit. When there is no load or a light load, the force that the load offsets against the spring force is small, so by switching to the normal circuit and using it, the lifting operation can be performed more efficiently. When not in use (when not raising or lowering), if both the on-off valves (13) and (14) are closed, the loading platform will not move regardless of the height at which the platform is loaded or unloaded. [Example]

[0025] The following describes an example in which the inventions proposed in Patent Documents 1 and 2 are applied to this device. Figure 3 shows a side view of an application example in which this device is connected to an existing hydraulic lift (10) to raise the loading platform in the event of flooding. To make the structure easier to understand, the device is shown in an exaggerated plan view from above. This equipment is connected to the middle of the piping to the hydraulic pump (7) of an existing hydraulic lift (10), and a float lever (11) is attached to the platform and linked to the relief valve (7a) of the hydraulic pump (7) with a wire (11a). The balance is set so that the spring force can lift the load to the highest point, and when the hydraulic operating system is in the reversed state, the float lever (11) operates and the relief valve (7a) opens, hydraulic pressure is applied to the hydraulic jack (8) of the hydraulic lift (10), and the platform of the hydraulic lift (10) rises. Even if the vehicle is flooded due to a flood or other disaster, the platform of the hydraulic lift (10) can be automatically raised unmanned and without power as the water level rises.

[0026] Also, instead of the float lever (11), a float valve that opens the hydraulic circuit when the float floats on the platform can be attached, and a bypass connection can be established between the hydraulic jack (8) and the hydraulic cylinder (2) via an on-off valve (14). When the switching valve (12) is in the neutral position and the on-off valve (14) is closed, the float valve operates to open the bypass circuit, applying hydraulic pressure to the hydraulic jack (8) and raising the platform of the hydraulic lift (10). [Industrial Applicability]

[0027] By connecting this device to the middle of the piping of an existing hydraulic lift, etc., even if the relief valve is accidentally opened and the primary hydraulic pressure is released while a vehicle or object is being lifted and work is being done underneath, the platform will stop near the middle of the lifting height and will not descend to the lowest point, making it a safety device that prevents accidents such as workers being crushed under the vehicle or object.

[0028] Furthermore, when used to repeatedly raise and lower objects of similar weight, such as existing hydraulic elevators for multi-story parking garages, vehicles in large amusement facilities, or the booms and arms of construction machinery such as power shovels, by connecting this device to the middle of the piping, the force of the spring and the weight of the load can be offset, allowing the object to be raised and lowered with little force, requiring less electricity and fuel consumption and providing great energy savings.

[0029] By connecting this device to the middle of the piping of an existing hydraulic lift, attaching a float lever to the loading platform and linking it to the hydraulic pump relief valve with a wire, the loading platform can be automatically raised as the water level rises, even if it is flooded due to a flood, without any human or power source, and vehicles and objects placed on it can be protected from flood damage. [Explanation of symbols]

[0030] 1 Hydraulic cylinder 1a Piston rod 2 Hydraulic cylinder 2a Piston rod 3 hydraulic cylinders 4 Compression spring 4a Holder plate 5 Connecting rod 5a Connecting plate 6 frames 7 Existing hydraulic pump 7a Relief valve 8 Existing hydraulic jack 9 Spring load adjustment screw 10 Existing hydraulic lift 11 Float lever 11a Wire 12 Switching valve 13 Opening and closing valve 14 Opening and closing valve 15 Double-acting hydraulic cylinder WL water surface

Claims

1. The main components are three hydraulic cylinders (1), (2), and (3), or two hydraulic cylinders (2) and (15) if the hydraulic cylinders (1) and (3) are replaced with one double-acting hydraulic cylinder, a compression spring (4), a frame (6) for incorporating them into a connecting rod (5) for linking the piston rods (1a) and (2a) of the hydraulic cylinders, and a switching valve (12) and opening / closing valves (13) and (14) for connecting the hydraulic cylinders (1), (2), and (3) to an existing hydraulic pump (7), hydraulic jack (8), etc. The compression spring (4) and hydraulic cylinder (3) are assembled so that a force is applied in the direction pushing back the piston rod (2a) of the hydraulic cylinder, and the hydraulic cylinders (1) and (3) are connected to a hydraulic pump (7) via a switching valve (12), and the hydraulic cylinder (2) is connected to a hydraulic jack (8) or the like via an opening / closing valve (14). When the hydraulic cylinder (1) and hydraulic pump (7) are connected by the switching valve (12) with the on-off valve (13) closed and (14) open, the relief valve (7a) of the hydraulic pump is opened to lower the hydraulic pressure of the hydraulic cylinder (1), and the force of the compression spring (4) generates hydraulic pressure from the hydraulic cylinder (2) and applies pressure to the hydraulic jack (8), etc. Conversely, when hydraulic pressure is generated by the hydraulic pump (7), the hydraulic cylinder (1) compresses the compression spring (4), lowering the hydraulic pressure generated by the hydraulic cylinder (2), thus reversing the operating system of existing hydraulic equipment. In addition, when the hydraulic cylinder (3) and the hydraulic pump (7) are connected by the switching valve (12), when hydraulic pressure is generated by the hydraulic pump (7), the hydraulic pressure is generated from the hydraulic cylinder (2) in combination with the force of the compression spring (4) and pressurized to the hydraulic jack (8), etc., and when the relief valve (7a) is opened, the hydraulic pressure generated in the hydraulic cylinder (2) drops, and the hydraulic pressure of the hydraulic jack (8), etc. also drops, resulting in a normal operating system. By adding a circuit in parallel to the existing hydraulic circuit via the switching valve (12) and the opening / closing valves (13) and (14), when hydraulic pressure is generated by the hydraulic pump (7) on the primary side, hydraulic pressure can be applied to or removed from the hydraulic jack (8) on the secondary side, etc. A hydraulic device or mechanism that allows the operating system of an existing hydraulic device to be switched between forward and reverse operation.

2. Connect it to the piping of the existing hydraulic lift (10) and set the balance so that the load can be lifted to the highest point using only the spring force. A float lever (11) is attached to the loading platform and linked to the existing hydraulic pump relief valve (7a) with a wire (11a). When the operating system is in the reverse position, the float lever (11) operates and the relief valve (7a) opens. Alternatively, a float valve is attached to the loading platform so that the hydraulic circuit opens when the float floats, and a bypass connection is made between the hydraulic jack (8) and the hydraulic cylinder (2) via an on-off valve (14). When the switching valve (12) is in the neutral position and the on-off valve (14) is closed, the float valve operates to open the bypass circuit. By applying hydraulic pressure to the hydraulic jack (8), the loading platform automatically rises. The hydraulic equipment and mechanism according to claim 1.

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