A wheel swing system for a segment carrier

Abstract

The embodiment of the application provides a wheel swing system of a segment transport vehicle, which comprises a swing control valve, one or more swing hydraulic cylinders and one or more swing limiting speed valves, wherein the number of the swing hydraulic cylinders is the same as the number of the swing limiting speed valves, the swing control valve has an extension pressure oil outlet and a retraction pressure oil outlet, each swing hydraulic cylinder comprises a rod cavity and a rodless cavity, each swing limiting speed valve has an inlet end and an outlet end, the inlet end of each swing limiting speed valve is communicated with the rod cavity of one swing hydraulic cylinder to realize one-to-one corresponding connection of the swing limiting speed valve and the swing hydraulic cylinder, the outlet ends of all swing limiting speed valves are communicated with the retraction pressure oil outlet of the swing control valve, and the rodless cavities of all swing hydraulic cylinders are communicated with the extension pressure oil outlet of the swing control valve. The wheel swing system of the segment transport vehicle described above can limit the movement speed of the swing hydraulic cylinder, and avoids the tire damage and the unstable running of the whole vehicle caused by the too fast movement speed of the swing hydraulic cylinder.

Description

Technical Field

[0001] This application relates to the field of segment transport vehicle technology, specifically to a wheel oscillation system for a segment transport vehicle. Background Technology

[0002] A possible structural diagram of the wheel oscillation system of a segment transport vehicle in the prior art is shown below. Figure 1 As shown, it typically includes a hydraulic pump 11, an oil tank 12, a solenoid relief valve 13, a swing control valve 14, a first swing hydraulic cylinder 15, a second swing hydraulic cylinder 16, a third swing hydraulic cylinder 17, a fourth swing hydraulic cylinder 18, and related connecting pipelines. The swing control valve 14 is usually a three-position four-way directional valve. The driver operates the solenoid relief valve 13 to simultaneously control the valve core of the swing control valve 14, switching the flow direction of the pressurized oil, thereby achieving the switching of the actions of the first swing hydraulic cylinder 15, the second swing hydraulic cylinder 16, the third swing hydraulic cylinder 17, and the fourth swing hydraulic cylinder 18.

[0003] The existing technology has a drawback: when operating the swing cylinder, the swing hydraulic cylinder often exhibits rapid movement, which can lead to tire damage, tire blowouts, and unstable operation of the segment transport vehicle, resulting in poor safety of the segment transport vehicle. Summary of the Invention

[0004] In view of the above problems, this application provides a wheel swing system for a segment transport vehicle, which overcomes or at least partially solves the above problems.

[0005] According to one aspect of the embodiments of this application, a wheel swaying system for a segment transport vehicle is provided, including: a swaying control valve, one or more swaying hydraulic cylinders and one or more swaying speed limiting valves, wherein the number of swaying hydraulic cylinders is the same as the number of swaying speed limiting valves;

[0006] The swing control valve has an extended pressure port and a retracted pressure port, each swing hydraulic cylinder includes a rod chamber and a rodless chamber, and each swing speed limit valve has an inlet end and an outlet end;

[0007] The inlet end of each swing speed limiter valve is connected to the rod chamber of a swing hydraulic cylinder to achieve a one-to-one correspondence between the swing speed limiter valve and the swing hydraulic cylinder. The outlet end of all swing speed limiters is connected to the retraction pressure port of the swing control valve.

[0008] The rodless chamber of all swing hydraulic cylinders is connected to the extended pressure port of the swing control valve.

[0009] In one alternative embodiment, the swing control valve further includes a first hydraulically controlled check valve, a second hydraulically controlled check valve, a pressure reducing valve, and a solenoid directional valve, wherein...

[0010] The pressure reducing valve has a spring chamber;

[0011] The solenoid directional valve has a high-pressure port and a return port;

[0012] One port of the first hydraulic check valve is connected to the extended pressure port, the other port of the first hydraulic check valve is connected to one port of the pressure reducing valve, the other port of the pressure reducing valve is connected to one outlet of the solenoid directional valve, the drain port of the pressure reducing valve is connected to the return port, and the return port is connected to the oil tank; one port of the second hydraulic check valve is connected to the retracted pressure port, and the other port of the second hydraulic check valve is connected to the other outlet of the solenoid directional valve.

[0013] The spring chamber of the pressure reducing valve is connected to the return port, the high-pressure port of the solenoid directional valve is connected to the hydraulic pump, and the high-pressure port of the solenoid directional valve is also connected to the oil tank through the solenoid relief valve.

[0014] In one alternative configuration, the pilot ratio of the first hydraulic check valve and the second hydraulic check valve is 4:1.

[0015] In one alternative configuration, the pressure reducing valve is set to 90 bar.

[0016] In one alternative configuration, the flow rate of the solenoid directional valve is 10 liters per minute.

[0017] In one alternative embodiment, the swing control valve has: a first pressure measuring port and a second pressure measuring port, the first pressure measuring port being connected to the extended pressure port and the second pressure measuring port being connected to the retracted pressure port, the first pressure measuring port being used to measure the pressure in the rodless chamber of the swing hydraulic cylinder, and the second pressure measuring port being used to measure the pressure in the oil pipe between the swing control valve and the swing speed limit valve respectively.

[0018] In one alternative embodiment, each swing speed limiting valve includes a first check valve, a second check valve, a third check valve, a fourth check valve, a fifth check valve, and an adjustable speed limiting valve, wherein...

[0019] The first check valve and the second check valve are connected in series in reverse order of flow direction via the first connecting pipe. The oil inlet of the first check valve is connected to the outlet of the first swing speed limiter valve via the second connecting pipe, and the oil inlet of the second check valve is connected to the inlet of the first swing speed limiter valve via the third connecting pipe.

[0020] The third check valve and the fourth check valve are connected in series in reverse order of flow direction via the fourth connecting pipe. The oil outlet of the third check valve is connected to the inlet of the first swing speed limiting valve via the third connecting pipe, and the oil outlet of the fourth check valve is connected to the outlet of the first swing speed limiting valve via the second connecting pipe.

[0021] A fifth check valve and an adjustable speed limiter valve are connected in parallel between the first connecting pipe between the first check valve and the second check valve and the fourth connecting pipe between the third check valve and the fourth check valve. The oil outlet of the fifth check valve and one port of the adjustable speed limiter valve are connected to the first connecting pipe between the first check valve and the second check valve through the fifth connecting pipe. The oil inlet of the fifth check valve and the other port of the adjustable speed limiter valve are connected to the fourth connecting pipe between the third check valve and the fourth check valve through the sixth connecting pipe.

[0022] In one alternative configuration, the flow rates of the first check valve, the second check valve, the third check valve, the fourth check valve, and the fifth check valve are all 1.0 liters per minute.

[0023] In one alternative configuration, the swing speed limiter is installed at the bottom center of the axle of the segment transport vehicle.

[0024] According to another aspect of the embodiments of this application, a segment transport vehicle is provided, including a wheel swing system.

[0025] This application provides a wheel swing system for a segment transport vehicle that can limit the flow of oil in the rod chamber, thereby limiting the movement speed of the swing hydraulic cylinder. This avoids tire damage and vehicle instability caused by excessively fast movement of the swing hydraulic cylinder, thus improving the safety and reliability of the segment transport vehicle.

[0026] The above description is merely an overview of the technical solutions of the embodiments of this application. In order to better understand the technical means of the embodiments of this application and to implement them in accordance with the contents of the specification, and to make the above and other objects, features and advantages of the embodiments of this application more obvious and understandable, specific implementation methods of this application are described below. Attached Figure Description

[0027] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of a possible structure for the wheel swing system of a segment transport vehicle in the prior art.

[0029] Figure 2 This is a schematic diagram of a possible structure of the wheel swing system of a segment transport vehicle according to an embodiment of this application. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0031] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein in the specification of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0032] The terms "comprising" and "having," and any variations thereof, used in the specification, claims, and drawings of this application are intended to cover without excluding other meanings. The words "a" or "an" do not exclude the presence of multiples.

[0033] The term "embodiment" as used herein means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of the phrase "embodiment" in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0034] In this article, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0035] The directional terms appearing in the following description refer to the directions shown in the figures and are not intended to limit the specific structure of the wheel swing system of the segment transport vehicle of this application. For example, in the description of this application, the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the figures. They are only for the convenience of describing this application 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. Therefore, they should not be construed as limitations on this application.

[0036] Furthermore, the descriptions of the directions used to explain the operation and construction of the wheel oscillation system of the segment transport vehicle in this embodiment, such as the X direction, Y direction, and Z direction, are not absolute but relative. Although these directions are appropriate when the components of the battery pack are in the positions shown in the figure, they should be interpreted differently when these positions change to correspond to the changes.

[0037] Furthermore, the terms "first," "second," etc., in the specification and claims of this application or in the aforementioned drawings are used to distinguish different objects rather than to describe a specific order, and may explicitly or implicitly include one or more of the features.

[0038] In the description of this application, unless otherwise stated, "multiple" means two or more (including two), and similarly, "multiple groups" means two or more (including two groups).

[0039] In the description of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linkage" should be interpreted broadly. For example, "connection" or "linkage" in mechanical structures can refer to a physical connection, such as a fixed connection, for example, a connection fixed by fasteners, such as a connection fixed by screws, bolts, or other fasteners; a physical connection can also be a detachable connection, such as a snap-fit ​​or interlocking connection; a physical connection can also be an integral connection, such as a connection formed by welding, bonding, or integral molding. In circuit structures, "connection" or "linkage" can refer not only to a physical connection but also to an electrical connection or a signal connection. For example, it can be a direct connection, i.e., a physical connection, or an indirect connection through at least one intermediate component, as long as the circuit is connected; it can also refer to the internal connection of two components. Signal connection can refer not only to signal connection through a circuit but also to signal connection through a media, such as radio waves. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0040] Please see Figure 2 This is a schematic diagram of a possible structure of a wheel swing system for a segment transport vehicle according to an embodiment of this application. The wheel swing system of the segment transport vehicle includes a hydraulic pump 10, an oil tank 20, an electromagnetic overflow valve 30, a swing control valve 40, one or more swing hydraulic cylinders, and one or more swing speed limiting valves, wherein the number of swing hydraulic cylinders is the same as the number of swing speed limiting valves.

[0041] Understandable. Figure 2 The structure shown is for illustrative purposes only. The wheel oscillation system of the segment transport vehicle in this embodiment may also include a more advanced design. Figure 2 The more or fewer components shown, or having the same Figure 2 The different configurations shown.

[0042] In this embodiment of the application, the swing speed limiting valve and the swing hydraulic cylinder of the wheel swing system are connected one-to-one. The swing control valve 40 has an extension oil port A and a retraction oil port B. Each swing hydraulic cylinder includes a rod chamber and a rodless chamber. Each swing speed limiting valve has an inlet end C and an outlet end V.

[0043] The inlet C of each swing speed limiting valve is connected to the rod chamber of a swing hydraulic cylinder, and the outlet V of all swing speed limiting valves is connected to the retraction pressure port B of the swing control valve 40.

[0044] The rodless chamber of all swing hydraulic cylinders is connected to the extended pressure port A of the swing control valve 40.

[0045] For ease of description, in this embodiment, there can be four swing speed limiting valves, such as a first swing speed limiting valve 50, a second swing speed limiting valve 51, a third swing speed limiting valve 52, and a fourth swing speed limiting valve 53. The internal structures of the first swing speed limiting valve 50, the second swing speed limiting valve 51, the third swing speed limiting valve 52, and the fourth swing speed limiting valve 53 are all identical. Correspondingly, the number of swing hydraulic cylinders can also be four, such as a first swing hydraulic cylinder 60, a second swing hydraulic cylinder 61, a third swing hydraulic cylinder 62, and a fourth swing hydraulic cylinder 63. The internal structures of the first swing hydraulic cylinder 60, the second swing hydraulic cylinder 61, the third swing hydraulic cylinder 62, and the fourth swing hydraulic cylinder 63 are all identical.

[0046] Specifically, the first swing speed limiting valve 50 and the first swing hydraulic cylinder 60 are connected to each other, the second swing speed limiting valve 51 and the second swing hydraulic cylinder 61 are connected to each other, the third swing speed limiting valve 52 and the third swing hydraulic cylinder 62 are connected to each other, and the fourth swing speed limiting valve 53 and the fourth swing hydraulic cylinder 63 are connected to each other.

[0047] Since the internal structures of the first swing speed limiting valve 50, the second swing speed limiting valve 51, the third swing speed limiting valve 52, and the fourth swing speed limiting valve 53 are the same, for the sake of brevity, this embodiment uses the first swing speed limiting valve 50 as an example to illustrate the structure of each swing speed limiting valve.

[0048] For example, the first swing speed limiting valve 50 includes a first check valve 501, a second check valve 502, a third check valve 503, a fourth check valve 504, a fifth check valve 505, and an adjustable speed limiting valve 506.

[0049] First check valve 501, second check valve 502, third check valve 503, fourth check valve 504, and fifth check valve 505 are all ordinary check valves. A pilot-operated check valve relies on the pressure of a control fluid (e.g., oil) to allow reverse flow. The difference between a pilot-operated check valve and an ordinary check valve is the addition of a control oil circuit. When the control oil circuit is not connected to pressurized oil, the pilot-operated check valve operates like an ordinary check valve; pressurized oil flows only from the inlet to the outlet and cannot flow in the reverse direction. When control pressure is input to the control oil circuit, the piston rod moves to the right under the action of pressurized oil, opening the check valve and connecting the inlet and outlet. If the outlet pressure is greater than the inlet pressure, the oil will flow in the reverse direction.

[0050] Taking the first swing hydraulic cylinder 60 as an example, the first swing hydraulic cylinder 60 includes a rod chamber 601 and a rodless chamber 602.

[0051] The swing control valve 40 includes a first hydraulic check valve 41, a second hydraulic check valve 42, a pressure reducing valve 43, and a solenoid directional valve 44. The swing control valve 40 also has a first pressure measuring port M1 and a second pressure measuring port M2. The pressure reducing valve 43 has a spring chamber, and the solenoid directional valve 44 has a high-pressure port P and a return port T.

[0052] This application takes a first swing speed limiting valve 50 as an example to describe the structure of the swing speed limiting valve in detail. In the first swing speed limiting valve 50, a first check valve 501 and a second check valve 502 are connected in series in reverse order of flow direction via a first connecting pipe. The oil inlet of the first check valve 501 is connected to the outlet V of the first swing speed limiting valve 50 via a second connecting pipe, and the oil inlet of the second check valve 502 is connected to the inlet C of the first swing speed limiting valve 50 via a third connecting pipe. A third check valve 503 and a fourth check valve 504 are connected in series in reverse order of flow direction via a fourth connecting pipe. The oil outlet of the third check valve 503 is connected to the inlet C of the first swing speed limiting valve 50 via a third connecting pipe. The oil outlet of the fourth check valve 504 is connected to the outlet V of the first swing speed limiting valve 50 through the second connecting pipe; the fifth check valve 505 and the adjustable speed limiting valve 506 are connected in parallel between the first connecting pipe between the first check valve 501 and the second check valve 502 and the fourth connecting pipe between the third check valve 503 and the fourth check valve 504. The oil outlet of the fifth check valve 505 and one port of the adjustable speed limiting valve 506 are connected to the first connecting pipe between the first check valve 501 and the second check valve 502 through the fifth connecting pipe, and the oil inlet of the fifth check valve 505 and the other port of the adjustable speed limiting valve 506 are connected to the fourth connecting pipe between the third check valve 503 and the fourth check valve 504 through the sixth connecting pipe.

[0053] In another embodiment of this application, the first check valve 501, the second check valve 502, the third check valve 503, and the fourth check valve 504, under the control of the electromagnetic relief valve 30, allow the oil to pass through the adjustable speed limiting valve 506 in a predetermined direction, for example, as... Figure 2 As shown, the predetermined flow direction is opposite to the direction from the oil inlet to the oil outlet of the fifth check valve 505, so that the oil flows through the adjustable flow valve 506 from the predetermined flow direction, thereby ensuring the stability of the oil flow.

[0054] In another embodiment of this application, the fifth one-way valve 505 and the adjustable speed limiting valve 506 are connected in parallel. When the oil at the outlet of the adjustable speed limiting valve 506 suddenly fluctuates, the surge oil can be prevented from flowing into the adjustable speed limiting valve 506, thereby alleviating the impact of the oil on the adjustable speed limiting valve 506 in an instant, avoiding pressure fluctuations of the oil at both ends of the adjustable speed limiting valve 506 in the first swing speed limiting valve 50, and further improving the smoothness of the swing action.

[0055] In another embodiment of this application, the flow rates of the first check valve 501, the second check valve 502, the third check valve 503, the fourth check valve 504, and the fifth check valve 505 are all 1.0 liters per minute (L / min). An adjustable speed limiter valve 506 is used to limit the flow rate of oil passing through the adjustable speed limiter valve 506 to be less than or equal to a first threshold, for example, the first threshold can be 0.4 L / min.

[0056] The first swing speed limiting valve 50, the second swing speed limiting valve 51, the third swing speed limiting valve 52, and the fourth swing speed limiting valve 53 are all installed at the bottom center of the axle of the segment transport vehicle. For example, the first swing speed limiting valve 50, the second swing speed limiting valve 51, the third swing speed limiting valve 52, and the fourth swing speed limiting valve 53 together form a swing speed limiting valve group, and the swing speed limiting valve group has a cuboid structure. For example, the structural dimensions of the swing speed limiting valve group can be 150 mm * 139 mm * 70 mm, which facilitates installation at the bottom center of the axle of the segment transport vehicle, occupies less space, and facilitates pipeline connection. The first swing speed limiting valve 50, the second swing speed limiting valve 51, the third swing speed limiting valve 52, and the fourth swing speed limiting valve 53 work together to limit the movement speed of the first swing hydraulic cylinder 60, the second swing hydraulic cylinder 61, the third swing hydraulic cylinder 62, and the fourth swing hydraulic cylinder 63 to be less than or equal to a second threshold, for example, the second threshold can be 117 mm / min.

[0057] In this embodiment, the first swing hydraulic cylinder 60 is used as an example. The rod chamber 601 is used to push the swing cylinder rod to retract according to the input oil, and the rodless chamber 602 is used to push the swing cylinder rod to extend according to the input oil.

[0058] In the swing control valve 40, the swing control valve 40 establishes an oil flow path according to two working states: the first hydraulic check valve 41 is open or reverse open, and the second hydraulic check valve 42 is open or reverse open. Open means that when the oil passes through the hydraulic check valve, the oil flows from the oil inlet of the hydraulic check valve to the oil outlet of the hydraulic check valve; reverse open means that when the oil passes through the hydraulic check valve, the oil flows from the oil outlet of the hydraulic check valve to the oil inlet of the hydraulic check valve.

[0059] When the first hydraulically controlled check valve 41 is open, one port of the first hydraulically controlled check valve 41 is connected to the extended pressure port A, and the other port of the first hydraulically controlled check valve 41 is connected to the outlet of the pressure reducing valve 43. The spring chamber of the pressure reducing valve is connected to the return port T, and the return port T is connected to the oil tank 20. When the first hydraulically controlled check valve 41 is opened in the reverse direction, one port of the first hydraulically controlled check valve 41 is connected to the extended pressure port A, and the other port of the first hydraulically controlled check valve 41 is connected to one port of the pressure reducing valve 43. The other port of the pressure reducing valve 43 is connected to the outlet of the solenoid directional valve 44.

[0060] When the second hydraulically controlled check valve 42 is open, one port of the second hydraulically controlled check valve 42 is connected to the retractable pressure port B, and the other port of the second hydraulically controlled check valve 42 is connected to the outlet of the solenoid directional valve 44. When the second hydraulically controlled check valve 42 is opened in the reverse direction, one port of the second hydraulically controlled check valve 42 is connected to the retractable pressure port B, and the other port of the second hydraulically controlled check valve 42 is connected to the outlet of the solenoid directional valve 44.

[0061] The spring chamber of the pressure reducing valve 43 is connected to the return port T, the high pressure port P is connected to the hydraulic pump 10, and the high pressure port P is also connected to the oil tank 20 through the electromagnetic relief valve 30.

[0062] In another embodiment of this application, the pilot ratio of the first pilot-operated check valve 41 and the second pilot-operated check valve 42 is 4:1. The pilot ratio is the ratio of the pilot area to the overflow area of ​​the pilot-operated check valve. The pilot ratio of the first pilot-operated check valve 41 and the second pilot-operated check valve 42 is 4:1, that is, the ratio of the pressure required to open the first pilot-operated check valve 41 without pilot oil to the pressure required to open the first pilot-operated check valve 41 with pilot oil alone is 4:1; the ratio of the pressure required to open the second pilot-operated check valve 42 without pilot oil to the pressure required to open the second pilot-operated check valve 42 with pilot oil alone is 4:1.

[0063] In another embodiment of this application, the pressure of the pressure reducing valve 43 is set to 90 bar, where 1 bar is 100,000 Pa. The spring chamber of the pressure reducing valve 43 is connected to the oil return port T to prevent back pressure from being generated in the valve core of the pressure reducing valve 43.

[0064] In another embodiment of this application, the flow rate of the electromagnetic reversing valve 44 is 10 L / min, and it has a Y-type function.

[0065] In another embodiment of this application, the first pressure measuring port M1 is used to measure the pressure in the rodless chamber of all swing hydraulic cylinders, and the second pressure measuring port M2 is used to measure the pressure in the oil pipe between the swing control valve 40 and each swing speed limit valve.

[0066] According to an embodiment of this application, the driver of a segment transport vehicle uses an electromagnetic overflow valve 30 to enable the wheel oscillation system to operate in two states.

[0067] When the tires need to swing, the driver controls the solenoid relief valve 30 and the solenoid directional valve 44 to make the first hydraulic check valve 41 in the swing control valve 40 work in the forward direction and the second hydraulic check valve 42 work in the reverse direction. The forward operation of the first hydraulic check valve 41 means that the oil flows from the outlet of the pressure reducing valve 43 to port A of the control valve 40, and the reverse operation of the second hydraulic check valve 42 means that the oil flows from port B of the control valve 40 to the solenoid directional valve 44 when passing through the second hydraulic check valve 42. When the first hydraulic check valve 41 operates in the forward direction and the second hydraulic check valve 42 operates in the reverse direction, the oil from the hydraulic pump 10 is reduced in pressure by the pressure reducing valve 11. Due to the oil pressure, the outlet of the first hydraulic check valve 41 is opened, allowing the oil to flow forward through it and out of its inlet. The outflowing oil then enters the rodless chamber of all the swing hydraulic cylinders through the extended pressure port A. The oil entering the rodless chamber pushes the swing cylinder rod to extend. The extension of the swing cylinder rod causes the oil in all the rod chambers to enter the corresponding swing speed limiting valve. Taking the first swing speed limiting valve 50 as an example, the oil in the rod chamber 601 of the first swing hydraulic cylinder 60 enters the first swing speed limiting valve 50 through the inlet end C of the first swing speed limiting valve. Due to the pressure of the oil, the second check valve 502 is opened in the positive direction and flows from the outlet of the second check valve 502 through the adjustable speed limiting valve 506. Among them, some oil may flow into the fifth check valve 505, such as... Figure 2 As shown, the oil in the adjustable speed limiting valve 506 flows through in a predetermined flow direction, which is consistent with the direction from the inlet to the outlet of the fifth check valve 505. After the oil flows out of the adjustable speed limiting valve 506, the pressure of the oil opens the fourth check valve 504. Finally, the oil flows from the inlet of the fourth check valve 504 into the outlet V of the first swing speed limiting valve. The oil flows out of the swing speed limiting valve 50 from the outlet V of the first swing speed limiting valve. After flowing out of the swing speed limiting valve 50, the oil flows into the swing control valve 40 through the retractable pressure port B and then into the swing control valve 40. After passing through the second hydraulic control check valve 42 which works in the opposite direction, the oil flows from port B of the swing control valve group 40 through the second hydraulic control check valve 42 into the return port T of the solenoid directional valve 44 and back into the oil tank 20.

[0068] When the movement speed of the first swing hydraulic cylinder 60, the second swing hydraulic cylinder 61, the third swing hydraulic cylinder 62, and the fourth swing hydraulic cylinder 63 gradually increases to the maximum extension speed, that is, when the movement speed reaches the second threshold, all adjustable speed limiting valves reach the maximum flow rate to be set. For example, the oil flow rate of the adjustable speed limiting valve 506 reaches the first threshold. At this time, if the flow rate of the second check valve 502 continues to increase, due to the flow limiting effect of the adjustable flow valve 506, the oil flow rate flowing through the adjustable flow valve 506 will not increase, thereby limiting the oil flow rate of the rod chamber 601 of the corresponding first swing hydraulic cylinder 60. This avoids tire damage and vehicle instability caused by the excessively fast movement speed of the corresponding first swing hydraulic cylinder 60, and improves the safety of the vehicle operation when the tire swings. Figure 2 The second swing speed limiting valve 51, the third swing speed limiting valve 52, and the fourth swing speed limiting valve 53 operate in the same way as the first swing speed limiting valve 50, so they will not be described in detail. Figure 2 The working process of the second swing hydraulic cylinder 61, the third swing hydraulic cylinder 62 and the fourth swing hydraulic cylinder 63 is the same as that of the first swing hydraulic cylinder 60, so they will not be described in detail.

[0069] When the swing cylinder rod needs to retract, the driver controls the solenoid relief valve 30 and the solenoid directional valve 44 to make the first hydraulic check valve 41 in the swing control valve 40 work in the forward direction and the second hydraulic check valve 42 work in the reverse direction. At this time, the oil does not pass through the pressure reducing valve 11. Because of the oil pressure, the oil outlet of the second hydraulic check valve 42 is connected and the second hydraulic check valve 42 is opened in the forward direction. The oil can pass through the second hydraulic check valve 42 and flow out from the oil inlet of the second hydraulic check valve 42. After flowing out, the oil enters the outlet V of all swing speed limiting valves through the retraction pressure port B, and enters each swing speed limiting valve through the outlet V of each swing speed limiting valve. For example, taking the first swing speed limiting valve 50 as an example, oil enters the outlet V of the first swing speed limiting valve 50. Then, due to the oil pressure, the first check valve 501 is opened, and the oil flows from the outlet of the first check valve 501 into the adjustable speed limiting valve 506. Some oil may flow into the fifth check valve 505. The oil in the adjustable speed limiting valve 506 flows through in a predetermined flow direction, which is consistent with the direction from the inlet to the outlet of the fifth check valve 505. Finally, after the oil flows out of the adjustable speed limiting valve 506, the oil pressure opens the third check valve 503, and the oil flows from the outlet of the third check valve 503 into... After flowing out of the inlet, the oil flows into the inlet C of the first swing speed limiting valve 50, and then flows out of the first swing speed limiting valve 50 from the inlet C. The oil flowing out of the first swing speed limiting valve 50 enters the rod chamber 601 of the corresponding first swing hydraulic cylinder 60, pushing the cylinder rod to retract. The retraction of the cylinder rod causes the oil in the rodless chamber 602 of the first swing hydraulic cylinder 60 to enter the swing control valve 40 through the extended pressure port A. It then flows from the inlet of the first hydraulic control check valve 41 to the outlet of the first hydraulic control check valve 41, and returns to the oil tank 20 through the return port T of the solenoid directional valve 44.

[0070] When the movement speed of the first swing hydraulic cylinder 60, the second swing hydraulic cylinder 61, the third swing hydraulic cylinder 62, and the fourth swing hydraulic cylinder 63 gradually increases to the maximum retraction speed, i.e., when the movement speed reaches the second threshold, all adjustable speed limiting valves reach the maximum flow rate to be set. For example, the oil flow rate of the adjustable speed limiting valve 506 reaches the first threshold. At this time, if the flow rate of the first check valve 501 continues to increase, due to the flow limiting effect of the adjustable flow valve 506, the oil flow rate flowing through the adjustable flow valve 506 will not increase, thereby limiting the oil flow rate of the rod chamber 601 of the corresponding first swing hydraulic cylinder 60. This avoids tire damage and vehicle instability caused by the excessively fast movement speed of the corresponding first swing hydraulic cylinder 60, and improves the safety of the vehicle operation when the tire swings.

[0071] Figure 2The second swing speed limiting valve 51, the third swing speed limiting valve 52, and the fourth swing speed limiting valve 53 operate in the same way as the first swing speed limiting valve 50, so they will not be described in detail. Figure 2 The working process of the second swing hydraulic cylinder 61, the third swing hydraulic cylinder 62 and the fourth swing hydraulic cylinder 63 is the same as that of the first swing hydraulic cylinder 60, so they will not be described in detail.

[0072] In summary, when the speed of the swing hydraulic cylinder in the segment transport vehicle described above gradually increases to the maximum speed of extension or retraction (i.e., when the speed reaches the second threshold), the oil flow rate in the adjustable speed limiting valve reaches the first threshold. At this point, if the flow rate to the inlet of the adjustable speed limiting valve continues to increase, the oil flow rate through the adjustable flow limiting valve will not increase due to the flow limiting effect of the adjustable flow valve. This limits the oil flow rate in the rod chamber and thus limits the speed of the swing hydraulic cylinder, avoiding tire damage and vehicle instability caused by excessively fast swing hydraulic cylinder movement. This improves the safety and reliability of the segment transport vehicle.

[0073] Those skilled in the art will understand that although some embodiments herein include certain features included in other embodiments but not others, combinations of features from different embodiments are intended to be within the scope of this application and form different embodiments. For example, in the claims, any of the claimed embodiments can be used in any combination.

[0074] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. A wheel oscillation system for a segment transport vehicle, characterized in that, The wheel oscillation system includes: an oscillation control valve (40), one or more oscillation hydraulic cylinders (60, 61, 62, 63) and one or more oscillation speed limiting valves (50, 51, 52, 53), wherein the number of the oscillation hydraulic cylinders is the same as the number of the oscillation speed limiting valves; The swing control valve (40) has an extended pressure port (A) and a retracted pressure port (B), each swing hydraulic cylinder includes a rod chamber and a rodless chamber, and each swing speed limit valve has an inlet end (C) and an outlet end (V). Each of the swing speed limiting valves has its inlet end (C) connected to the rod chamber of a swing hydraulic cylinder to achieve a one-to-one correspondence between the swing speed limiting valve and the swing hydraulic cylinder. The outlet end (V) of all the swing speed limiting valves (50, 51, 52, 53) is connected to the retraction pressure port (B) of the swing control valve (40). Each swing speed limiting valve includes a first check valve (501), a second check valve (502), a third check valve (503), a fourth check valve (504), a fifth check valve (505), and an adjustable speed limiting valve (506). The first check valve (501) and the second check valve (502) are connected in series in reverse order of the flow direction of the check valves through a first connecting pipe. The third check valve (503) and the fourth check valve (504) are connected in series in reverse order of flow direction via a fourth connecting pipe. The inlet of the first check valve (501) and the inlet of the fourth check valve (504) are connected to the outlet (V) of the swing speed limiting valve. The inlet of the second check valve (502) and the inlet of the third check valve (503) are connected to the inlet (C) of the swing speed limiting valve. The fifth check valve (505) and the adjustable speed limiting valve (506) are connected in parallel between the first connecting pipe and the fourth connecting pipe. The outlet of the fifth check valve (505) and one port of the adjustable speed limiting valve (506) are connected to the first connecting pipe, and the other ends of both are connected to the fourth connecting pipe. The rodless chamber of all the swing hydraulic cylinders (60, 61, 62, 63) is connected to the extended pressure port (A) of the swing control valve (40).

2. The wheel oscillation system according to claim 1, characterized in that, The swing control valve (40) further includes a first hydraulically controlled check valve (41), a second hydraulically controlled check valve (42), a pressure reducing valve (43), and a solenoid directional valve (44), wherein, The pressure reducing valve (43) has a spring cavity; The electromagnetic reversing valve (44) has a high-pressure port (P) and a return port (T). One port of the first hydraulic check valve (41) is connected to the extended pressure port (A), and the other port of the first hydraulic check valve (41) is connected to one port of the pressure reducing valve (43). The other port of the pressure reducing valve (43) is connected to one outlet of the solenoid directional valve (44). The drain port of the pressure reducing valve (43) is connected to the return port (T), and the return port (T) is connected to the oil tank (20). One port of the second hydraulic check valve (42) is connected to the retracted pressure port (B), and the other port of the second hydraulic check valve (42) is connected to the other outlet of the solenoid directional valve (44). The spring chamber of the pressure reducing valve (43) is connected to the return port (T), the high pressure port (P) of the electromagnetic reversing valve is connected to the hydraulic pump (10), and the high pressure port (P) of the electromagnetic reversing valve is also connected to the oil tank (20) through the electromagnetic relief valve (30).

3. The wheel oscillation system according to claim 2, characterized in that, The pilot ratio of the first hydraulic check valve (41) and the second hydraulic check valve (42) is 4:

1.

4. The wheel oscillation system according to claim 2 or 3, characterized in that, The pressure-reducing valve (43) is set to a pressure of 90 bar.

5. The wheel oscillation system according to claim 2, characterized in that, The electromagnetic reversing valve (44) has a flow rate of 10 liters / minute.

6. The wheel oscillation system according to claim 1, characterized in that, The swing control valve (40) has a first pressure measuring port (M1) and a second pressure measuring port (M2). The first pressure measuring port (M1) is connected to the extended pressure port (A), and the second pressure measuring port (M2) is connected to the retracted pressure port (B). The first pressure measuring port (M1) is used to measure the pressure in the rodless chamber of the swing hydraulic cylinder (60, 61, 62, 63), and the second pressure measuring port (M2) is used to measure the pressure in the oil pipe between the swing control valve (40) and the swing speed limiting valve (50, 51, 52, 53).

7. The wheel oscillation system according to claim 1, characterized in that, The inlet of the first check valve (501) is connected to the outlet (V) of the swing speed limiting valve via a second connecting pipe, and the inlet of the second check valve (502) is connected to the inlet (C) of the swing speed limiting valve via a third connecting pipe; the outlet of the third check valve (503) is connected to the inlet (C) of the swing speed limiting valve via a third connecting pipe, and the outlet of the fourth check valve (504) is connected to the outlet (V) of the swing speed limiting valve via a second connecting pipe; the outlet of the fifth check valve (505) and one port of the adjustable speed limiting valve (506) are connected to the first connecting pipe between the first check valve (501) and the second check valve (502) via a fifth connecting pipe, and the inlet of the fifth check valve (505) and the other port of the adjustable speed limiting valve (506) are connected to the fourth connecting pipe between the third check valve (503) and the fourth check valve (504) via a sixth connecting pipe.

8. The wheel oscillation system according to claim 7, characterized in that, The flow rate of the first check valve (501), the second check valve (502), the third check valve (503), the fourth check valve (504), and the fifth check valve (505) is 1.0 liters / minute.

9. The wheel oscillation system according to claim 1, characterized in that, The swing speed limiting valves (50, 51, 52, 53) are installed at the bottom center of the axle of the segment transport vehicle.

10. A segment transport vehicle, characterized in that, Includes the wheel oscillation system as described in any one of claims 1-9.

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