Liquid inverted plug compression type speed limiting system

Abstract

The invention relates to the technical field of automatic speed limiting, and discloses a liquid inverted plug compression type speed limiting system which comprises a liquid pump, and a rotating shaft of the liquid pump is fixedly connected to a rotating shaft of a walking mechanism and is driven by the rotating shaft of the walking mechanism to rotate; a liquid cylinder throttler and a soft liquid reservoir are sequentially connected from a liquid outlet to a liquid inlet of the liquid pump, the liquid cylinder throttler comprises a liquid cylinder, a throttling valve and a piston reset spring, and a cylinder rod of the liquid cylinder is in transmission connection with a valve element of the throttling valve through a transmission mechanism. A liquid outlet of the liquid pump is connected to the liquid cylinder and the throttling valve through two branches respectively, and the piston reset spring provides reset force opposite to hydraulic pushing force for a piston of the liquid cylinder. The hydraulic cylinder throttler is used for achieving automatic adjustment of the speed limiting speed of the system, the speed limiting work process does not depend on an additional hydraulic braking mechanism, locked rotor is fast, braking is more sensitive, speed reduction is stable, elements are few, faults are few, and safety and reliability are achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of automatic speed limit, and particularly to a liquid plug compression type speed limit system. Background Art

[0002] Manual wheelchairs, shopping carts, elderly assistive walkers, children's scooters, etc. are all very common non-powered walking devices. To improve the use safety of these non-powered walking devices, some are also provided with walking speed limit devices.

[0003] For example, a Chinese patent application with a publication number of CN116639174A, earlier designed by the present inventor, discloses an automatic braking method and an automatic braking mechanism for a non-powered walking device. A hydraulic pump linked thereto is connected to the wheel of the non-powered walking device, and the hydraulic pump is used as the hydraulic braking power source of the non-powered walking device; during the traveling process of the non-powered walking device, the rotating wheel drives the hydraulic pump to rotate, and the rotation of the hydraulic pump drives the braking medium liquid to circulate; a flow control valve is arranged on the circulation flow path of the braking medium liquid, and the opening degree of the flow control valve is controlled to control the braking speed point of the non-powered walking device. When the traveling speed of the non-powered walking device reaches the braking speed point, hydraulic braking is automatically performed.

[0004] Although the automatic braking method provided by the above invention can achieve automatic braking and can change the braking speed point, it relies on a dedicated hydraulic braking mechanism. Summary of the Invention

[0005] The purpose of the present invention is to provide a liquid plug compression type speed limit system with sensitive braking and not relying on a dedicated hydraulic braking mechanism, to solve one or more technical problems existing in the prior art, and at least provide a beneficial choice or create conditions.

[0006] To achieve the above purpose, the present invention adopts the following technical solutions.

[0007] A liquid plug compression type speed limit system includes a liquid pump, the rotating shaft of the liquid pump is connected to the rotating shaft of the walking mechanism and rotates under the drive of the rotating shaft of the walking mechanism; a liquid cylinder throttle and a soft body liquid storage device are sequentially connected from the liquid outlet of the liquid pump to the liquid inlet. The liquid cylinder throttle includes a liquid cylinder, a throttle valve and a piston return spring. The cylinder rod of the liquid cylinder is in transmission connection with the valve core of the throttle valve through a transmission mechanism. The liquid outlet of the liquid pump is connected to the liquid cylinder and the throttle valve respectively through two branches, and the piston return spring provides a return force opposite to the hydraulic driving force for the piston of the liquid cylinder.

[0008] When the walking speed of the walking mechanism becomes faster, the rotation speed of the rotating shaft becomes faster, thereby causing more liquid to flow out of the liquid outlet of the liquid pump. At this time, the hydraulic thrust exerted on the piston will also increase, thereby overcoming the reset force to move and push the valve core to reduce the valve port of the throttle valve, and the system speed limit speed becomes smaller, which plays a braking role.

[0009] When the walking speed of the walking mechanism slows down, the rotation speed of the rotating shaft slows down, thereby reducing the amount of liquid flowing out of the liquid outlet of the liquid pump. At this time, the hydraulic thrust exerted on the piston will also decrease. Under the action of the reset force, the valve core is pushed to enlarge the valve port of the throttle valve, and the system speed limit speed becomes larger, which has the effect of releasing the brake.

[0010] The speed limit value of the above-mentioned liquid back-plug compression speed limit system is determined by the position of the piston, that is, the opening of the throttle valve.

[0011] More preferably, a speed limiting adjustment device is connected to the piston, and the speed limiting adjustment device includes a speed limiting adjustment handle and a screw, the screw is threadedly connected to the piston and extends out of the liquid cylinder to form a movable connection with the liquid cylinder for sliding back and forth, the limit adjustment handle is installed on the protruding end of the screw, and the piston return spring is connected between the speed limiting adjustment handle and the outer wall of the liquid cylinder.

[0012] During operation, the initial position of the piston in the liquid cylinder and the initial tension of the piston return spring are adjusted by rotating the speed limit adjustment handle, thereby achieving the purpose of adjusting the initial opening of the throttle valve and the speed limit value.

[0013] More preferably, the valve core is a conical valve core that rotates in and out, and a conical valve port corresponding to the conical valve core is provided in the valve cavity of the throttle valve.

[0014] More preferably, the transmission mechanism is a gear rack mechanism, a gear is connected to the valve core, and a rack meshing with the gear is connected to the piston rod; when the piston moves back and forth, the rack is driven back and forth by the piston rod, thereby driving the gear to rotate, thereby realizing the rotation of the valve core.

[0015] More preferably, the soft liquid reservoir comprises a flexible inner tube made of soft material and a spring-shaped metal outer tube, wherein the flexible inner tube is wrapped by the spring-shaped metal outer tube, and the spring-shaped metal outer tube is used to protect the flexible inner tube and dissipate heat.

[0016] More preferably, the flexible inner tube is a vacuum tube, and both ends of the flexible inner tube respectively constitute liquid storage interface ends for connecting to a liquid delivery pipeline.

[0017] More preferably, a check valve is connected between the liquid outlet and the liquid inlet of the liquid pump. The check valve conducts unidirectionally from the liquid inlet to the liquid outlet to relieve pressure when the liquid pump rotates in reverse.

[0018] More preferably, an anti-blocking throttle is connected between the liquid outlet and the liquid inlet of the liquid pump to relieve pressure when the liquid cylinder throttle is blocked.

[0019] More preferably, the traveling mechanism is a non-powered traveling device.

[0020] More preferably, the traveling mechanism is a wheelchair, a baby carriage, a rehabilitation walking aid or an elderly assistance vehicle.

[0021] The technical solution provided by the present invention has at least the following technical effects or advantages.

[0022] First, a liquid reverse plug compression type speed limiting system provided by the present invention uses a liquid cylinder throttle to automatically adjust the speed limiting speed of the system. When the traveling speed of the traveling mechanism is too high, the liquid reverse plug compresses the liquid cylinder and then adjusts the throttle valve port to reduce the speed limiting speed, and then gives a stall force to the liquid pump, and reduces the traveling speed of the traveling mechanism by reducing the rotational speed of the liquid pump. The speed limiting working process does not rely on an additional hydraulic braking mechanism, has a fast stall, and the braking is more sensitive. It has the characteristics of smooth speed reduction, few components, few faults, safety and reliability, and no energy consumption.

[0023] Second, a liquid reverse plug compression type speed limiting system provided by the present invention uses a soft liquid storage device to store liquid. The soft liquid storage device adopts a tubular double-layer material design, with an outer layer being a tubular spring-shaped metal material (protection and heat dissipation) layer and an inner layer being a soft material liquid storage layer. It has the characteristics of small volume, good heat dissipation, can be bent arbitrarily, and is conducive to space installation. At the same time, the liquid is in a sealed vacuum body, and the liquid storage device works in vertical, horizontal, side-lying, inverted and other states without affecting the working performance of the traveling mechanism.

[0024] Some other beneficial effects of the present invention will become more obvious in the following description or be understood through practice. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 The figure shows a schematic structural diagram of a liquid reverse plug compression type speed limiting system provided by the present invention.

[0026] Figure 2 The figure shows a schematic structural diagram of a liquid cylinder throttle.

[0027] Figure 3 The figure shows a schematic structural diagram of the liquid cylinder throttle from another perspective.

[0028] Figure 4The structural schematic diagram of the soft liquid storage device is shown as follows.

[0029] Explanation of the reference numerals in the drawings.

[0030] 1: Liquid pump, 2: Liquid cylinder throttle, 3: Soft liquid storage device, 4: Check valve, 5: Anti-blocking throttle.

[0031] 1-1: Liquid outlet, 1-2: Liquid inlet.

[0032] 2-1: Liquid cylinder, 2-2: Throttle valve, 2-3: Piston return spring, 2-4: Cylinder rod, 2-5: Valve core, 2-6: Piston, 2-7: Limit adjustment handle, 2-8: Screw rod, 2-9: Gear, 2-10: Rack.

[0033] 3-1: Flexible inner tube, 3-2: Spring-shaped metal outer tube. Specific implementation manners

[0034] The following further describes the specific implementation manners of the present invention in combination with the drawings of the specification, so that the technical solutions of the present invention and their beneficial effects are clearer and more definite. The embodiments described below by referring to the drawings are exemplary and are intended to explain the present invention, and should not be construed as a limitation to the present invention.

[0035] The additional aspects and advantages of the present invention will become apparent in the following description part, or be understood through the practice of the present invention.

[0036] Refer to Figures 1 - 3 As shown, a liquid reverse plug compression type speed limiting system includes a liquid pump 1, and the liquid pump 1 is fixedly connected or connected in other transmission connection manners to the rotating shaft of the traveling mechanism and rotates under the drive of the rotating shaft of the traveling mechanism; a liquid cylinder throttle 2 and a soft liquid storage device 3 are sequentially connected from the liquid outlet to the liquid inlet of the liquid pump 1. The liquid cylinder throttle 2 includes a liquid cylinder 2-1, a throttle valve 2-2 and a piston return spring 2-3. The cylinder rod 2-4 of the liquid cylinder 2-1 is in transmission connection with the valve core 2-5 of the throttle valve 2-2 through a transmission mechanism. The liquid outlet of the liquid pump 1 is connected to the liquid cylinder 2-1 and the throttle valve 2-2 respectively through two branches, and the piston return spring 2-3 provides a restoring force opposite to the hydraulic driving force for the piston 2-6 of the liquid cylinder 2-1.

[0037] The speed limit value of the system is determined by the position of the piston, i.e., the opening degree of the throttle valve. The specific speed limit principle is as follows: when the traveling speed of the traveling mechanism becomes faster, the rotation speed of the rotating shaft becomes faster, and thus the amount of liquid flowing out of the liquid outlet 1-1 of the liquid pump 1 increases. At this time, the hydraulic thrust received by the piston 2-6 also increases, and then overcomes the restoring force to move and push the valve core 2-5 to reduce the liquid output of the throttle valve 2-2, and the speed limit speed becomes smaller, playing a braking role; when the traveling speed of the traveling mechanism becomes slower, the rotation speed of the rotating shaft becomes slower, and thus the amount of liquid flowing out of the liquid outlet 1-1 of the liquid pump 1 decreases. At this time, the hydraulic thrust received by the piston 2-6 also decreases, and under the action of the restoring force, it pushes the valve core 2-5 to increase the liquid output of the throttle valve, and the speed limit speed becomes larger, releasing the braking.

[0038] Combined with Figure 2 、 Figure 3 As shown, a speed limit adjusting device is connected to the piston 2-6. The speed limit adjusting device includes a speed limit adjusting handle 2-7 and a screw rod 2-8. The screw rod 2-8 is threadedly connected to the piston 2-6 and passes out of the liquid cylinder 2-1 and is movably connected to the liquid cylinder 2-1. The limit adjusting handle 2-7 is installed on the protruding end of the screw rod 2-7. The piston return spring 2-3 is connected between the speed limit adjusting handle 2-7 and the outer wall of the liquid cylinder 2-1; preferably, the piston return spring 2-3 is sleeved on the screw rod 2-7. During operation, by rotating the speed limit adjusting handle 2-7, the initial position of the piston 2-6 in the liquid cylinder 2-1 and the initial tension of the piston return spring 2-3 are adjusted, so as to achieve the purpose of adjusting the initial speed limit speed.

[0039] It should be noted that in some embodiments, the speed limit adjusting device can be omitted. When there is no speed limit adjusting device, the piston return spring 2-3 can be arranged in the liquid cylinder 2-1, as long as it can play other resetting roles.

[0040] Combined with Figure 2 As shown, the valve core 2-5 is a conical valve core, and a conical valve port corresponding to the conical valve core is provided in the valve cavity of the throttle valve 2-2; a threaded rod is connected to the conical valve core, and the threaded rod is threadedly connected to the throttle valve 2-2 to realize the rotation and screwing in and out of the valve core 2-5, so as to achieve the purpose of adjusting the opening degree of the valve port and controlling the flow rate.

[0041] Here, the advantage of setting the valve core 2-5 into a structure that screws in and out is that it is convenient to cooperate with the transmission mechanism to adjust the opening degree of the valve port and ensure stability after the adjustment. In some embodiments, the valve core 2-5 can also be set into a reciprocating linear movement mechanism in other structural forms known in the art or that can be realized in the future; this is not limited to this embodiment.

[0042] In this embodiment, the transmission mechanism is a gear rack mechanism, a gear 2-9 is connected to the valve core 2-5, and a rack 2-10 meshing with the gear 2-9 is connected to the piston rod 2-4; when the piston 2-6 moves back and forth, the rack 2-10 is driven to move back and forth by the piston rod 2-4, thereby driving the gear 2-9 to rotate, thereby realizing the rotation of the valve core 2-5 in and out, adjusting the valve opening, and controlling the liquid flow.

[0043] Combination Figure 4 As shown, the soft liquid reservoir 3 includes a flexible inner tube 3-1 made of soft material and a spring-shaped metal outer tube 3-2. The flexible inner tube 3-1 is inserted into and wrapped by the spring-shaped metal outer tube 3-2. The spring-shaped metal outer tube 3-2 is used to protect the flexible inner tube 3-1, prevent the flexible inner tube 3-1 from being flattened and the bending angle is too small, and can also promote the heat dissipation of the flexible inner tube 3-1.

[0044] In this embodiment, the flexible inner tube 3-1 is preferably a vacuum tube, which is filled with liquid and free of air in any deformation state of the flexible inner tube; the two ends of the flexible inner tube 3-1 respectively constitute liquid storage interface ends for connecting the liquid delivery pipeline. The spring-shaped metal outer tube 3-2 is preferably a tension spring structure, and the two ends are fixed to the walking mechanism. The outer diameter of the flexible inner tube 3-1 is preferably consistent with the inner diameter of the spring-shaped metal outer tube 3-2, and the flexible inner tube 3-1 just fits tightly into the spring-shaped metal outer tube 3-2. The flexible inner tube 3-1 is soft, oil-resistant, temperature-resistant, and can expand and retract freely. Combined with the double-layer design of the spring-shaped metal outer tube 3-2, it occupies a small space, is light in weight, has good heat dissipation, and can be bent arbitrarily, which is conducive to space installation. The liquid is in a sealed vacuum body, and the liquid system does not have liquid shortage or air mixing to affect the working performance of the walking mechanism. The liquid reservoir can work in any state (for example, vertical, horizontal, sideways, inverted) without affecting the working performance of the walking mechanism. It is particularly suitable for use on dynamically working walking mechanisms. For example, when used in elderly walkers, the speed limit performance will not be affected even if the walker falls sideways during storage.

[0045] Recombination Figure 1 As shown, a one-way valve 4 is connected between the liquid outlet 1-1 and the liquid inlet 1-2 of the liquid pump 1. The one-way valve 4 is unidirectionally conducted from the liquid inlet 1-2 to the liquid outlet 1-1, and is used to achieve pressure relief when the liquid pump is reversed. An anti-blocking throttle 5 is also connected between the liquid outlet 1-1 and the liquid inlet 1-2 of the liquid pump 1, and is used to relieve pressure when the liquid cylinder throttle 2 is blocked. The anti-blocking throttle 5 is a commercially available throttle, which is adjusted to the minimum opening position for use to prevent the liquid pump 1 from being blocked.

[0046] In addition, it should be noted that in the description of the present invention, for orientation terms, such as the terms "center", "horizontal", "vertical", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., the indicated orientation and positional relationships are based on the orientation or positional relationships shown in the drawings. This is only for the convenience of describing the present invention 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 should not be construed as limiting the specific protection scope of the present invention.

[0047] In addition, terms such as "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of technical features. Thus, features defined as "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, the meaning of "at least" is one or more, unless otherwise specifically defined.

[0048] In the present invention, unless otherwise clearly defined and limited, terms such as "assembled", "connected", and "joined" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may also be a mechanical connection; it may be directly connected or connected through an intermediate medium, and it may be internally connected and communicated between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0049] In the invention, unless otherwise specified and limited, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through other features therebetween. Moreover, the first feature being "above", "below", and "on top of" the second feature includes the first feature being directly above and diagonally above the second feature, or merely indicating that the horizontal height of the first feature is higher than that of the second feature. The first feature being "above", "below", and "beneath" the second feature includes the first feature being directly below or diagonally below the second feature, or merely indicating that the horizontal height of the first feature is lower than that of the second feature.

[0050] Through the above description of the structure and principle, those skilled in the art should understand that the present invention is not limited to the above specific embodiments. Improvements and substitutions using well-known technologies in the art based on the present invention all fall within the protection scope of the present invention. The protection scope of the present invention shall be defined by each claim item and its equivalents. Parts not described in the specific embodiments are all prior art or common general knowledge.

Claims

1. A liquid inverted plug compression type speed limiting system, characterized in that, It includes a liquid pump, the rotating shaft of which is connected to the rotating shaft of the walking mechanism and rotates driven by the rotating shaft of the walking mechanism; a liquid cylinder throttle and a flexible liquid storage device are sequentially connected from the liquid outlet to the liquid inlet of the liquid pump. The liquid cylinder throttle includes a liquid cylinder, a throttle valve and a piston return spring. The cylinder rod of the liquid cylinder is drivingly connected to the valve core of the throttle valve through a transmission mechanism. The liquid outlet of the liquid pump is connected to the liquid cylinder and the throttle valve respectively through two branches. The piston return spring provides a restoring force for the piston of the liquid cylinder in the opposite direction to the hydraulic driving force; When the walking speed of the walking mechanism becomes faster, the rotating speed of the rotating shaft becomes faster, and then the amount of liquid flowing out of the liquid outlet of the liquid pump increases. At this time, the hydraulic thrust received by the piston also increases, and then the piston moves against the restoring force and pushes the valve core to reduce the valve orifice of the throttle valve, and the system speed limit becomes smaller, playing a braking role; When the walking speed of the walking mechanism becomes slower, the rotating speed of the rotating shaft becomes slower, and then the amount of liquid flowing out of the liquid outlet of the liquid pump decreases. At this time, the hydraulic thrust received by the piston also decreases, and under the action of the restoring force, the valve core is pushed to increase the valve orifice of the throttle valve, and the system speed limit becomes larger, playing a role in releasing the brake.

2. The liquid inverted plug compression type speed limit system according to claim 1, characterized in that A speed limit adjusting device is connected to the piston. The speed limit adjusting device includes a speed limit adjusting handle and a screw rod. The screw rod is threadedly connected to the piston and penetrates out of the liquid cylinder to form a sliding connection with the liquid cylinder. The limit adjusting handle is installed at the penetrating end of the screw rod. The piston return spring is connected between the speed limit adjusting handle and the outer wall of the liquid cylinder; By rotating the speed limit adjusting handle, the initial position of the piston in the liquid cylinder and the initial tension of the piston return spring are adjusted.

3. A liquid plug compression type speed limit system according to claim 1, wherein The valve core is a conical valve core that rotates in and out. A conical valve orifice corresponding to the conical valve core is provided in the valve cavity of the throttle valve.

4. A liquid reverse plug compression type speed limiting system according to claim 1 or 3, characterized in that The transmission mechanism is a gear-rack mechanism. A gear is connected to the valve core, and a rack meshing with the gear is connected to the piston rod; when the piston moves back and forth, the piston rod drives the rack to move back and forth, and then drives the gear to rotate, realizing the in-and-out rotation of the valve core.

5. A liquid inverted plug compression type speed limiting system according to claim 1, characterized in that, The flexible liquid storage device includes a flexible inner tube made of a flexible material and a spring-shaped metal outer tube. The flexible inner tube is wrapped by the spring-shaped metal outer tube, and the spring-shaped metal outer tube is used to protect the flexible inner tube and dissipate heat.

6. The liquid inverted plug compression type speed limit system according to claim 5, characterized in that, The flexible inner tube is a vacuum tube, and both ends of the flexible inner tube form liquid storage interface ends for connecting liquid delivery pipelines.

7. A liquid inverted plug compression type speed limit system according to claim 1, characterized in that, A one-way valve is connected between the liquid outlet and the liquid inlet of the liquid pump. The one-way valve conducts unidirectionally from the liquid inlet to the liquid outlet, and is used to relieve pressure when the liquid pump rotates in reverse.

8. A liquid inverted plug compression type speed limit system according to claim 1, characterized in that, An anti-blocking throttle is connected between the liquid outlet and the liquid inlet of the liquid pump, and is used to relieve pressure when the liquid cylinder throttle is blocked.

9. A liquid inverted plug compression type speed limit system according to claim 1, wherein, The walking mechanism is a non-powered walking device.

10. A liquid inverted plug compression type speed limiting system according to claim 1, characterized in that, The walking mechanism is a wheelchair, a baby carriage, a rehabilitation walking aid or an elderly assistive vehicle.

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