Hydraulic control system, battery box protection system and wide-body vehicle

Abstract

The present invention provides a hydraulic control system, a battery box protection system, and a wide-body vehicle. The present invention utilizes a hydraulic actuator to drive the movement of the vehicle's protective cover, and utilizes a reversing valve to achieve movement reversal of the protective cover, so that the protective cover can open or close the battery exchange channel. When the battery exchange channel is closed, protection can be formed for the battery box at the battery exchange channel to prevent external stones from moving through the battery exchange channel and colliding with the battery box. In addition, an accumulator is provided on the oil supply line of the reversing valve. In special circumstances, such as when the hydraulic source has no liquid pressure, hydraulic oil can be supplied through the accumulator, so that the hydraulic actuator can still operate or remain in an operating state, thereby improving the endurance of the hydraulic control system. The accumulator can also stabilize the pressure of the oil supply line, avoiding excessive pressure differential fluctuations between the working oil ports of the reversing valve, which would cause the protective cover to move too much and collide with other components or even be damaged. The present invention has high stability in use and strong practicality.

Description

Technical Field

[0001] The present invention relates to the field of vehicle technology, and in particular to a hydraulic control system, a battery box protection system and a wide-body vehicle. Background Art

[0002] Off-road dump trucks, such as wide-body mining dump trucks, are widely used in open-pit coal mines, metal mines, stone mines and other mines. During use, they travel back and forth between mining sites and unloading sites. Since their routes are relatively fixed, battery swap stations can be set up, providing the basis for electric operation.

[0003] However, due to its complex working conditions and large transport slope, stones falling from the road or ore transported by the vehicle itself have the risk of falling from the battery exchange channel reserved on the vehicle, such as the upper battery exchange channel or the side battery exchange channel, and damaging the battery box, posing a safety hazard. Although there are solutions in the related art to protect the battery exchange channel with a protective cover, the protective cover is generally set as a detachable fixed structure or set to be opened or closed by hydraulic drive. The detachable structure requires manual disassembly and assembly, which is inconvenient to use. The hydraulic drive method does not require manual disassembly and assembly of the protective cover, but there is a risk that the hydraulic source does not work, resulting in the battery exchange channel not being able to open or close smoothly. Summary of the Invention

[0004] The present invention aims to solve, to a certain extent, the problem in the related art of how to improve the operating stability of a vehicle's battery box protection system.

[0005] To at least partially address the above-mentioned problems, the present invention provides a hydraulic control system according to a first aspect, comprising:

[0006] a hydraulic actuator, the hydraulic actuator being configured to be driven and connected to a protective cover of the vehicle and to move the protective cover relative to the battery box of the vehicle to open or close a battery exchange channel of the vehicle;

[0007] a reversing valve connected to the hydraulic actuator and used to control the action of the hydraulic actuator;

[0008] An accumulator is connected to the oil supply passage of the reversing valve.

[0009] Optionally, the hydraulic control system further includes a first one-way valve, which is arranged on the oil supply line, with the outlet of the first one-way valve arranged toward the reversing valve, and the accumulator is connected to the oil supply line at one end of the outlet of the first one-way valve.

[0010] Optionally, the hydraulic control system also includes a logic valve and a pressure relief valve; the inlet of the logic valve is connected to the oil supply circuit at the inlet end of the first one-way valve, the outlet of the logic valve is connected to the return oil circuit of the reversing valve, the control port of the logic valve is connected to the inlet of the pressure relief valve, the outlet of the pressure relief valve is connected to the return oil circuit, and the control port of the pressure relief valve is connected to the oil supply circuit at the outlet end of the first one-way valve.

[0011] Optionally, the hydraulic control system further includes a throttle valve and / or a relief valve; one end of the throttle valve is connected to the oil supply circuit at a first communication position, the first communication position being located between a connection point where the oil supply circuit is connected to a control port of the pressure relief valve and the reversing valve, and the other end of the throttle valve is connected to the oil return circuit;

[0012] The inlet of the relief valve is connected to the oil supply circuit at a second communication position, which is located between the connection point where the oil supply circuit is connected to the inlet of the logic valve and the hydraulic source, and the outlet of the relief valve is connected to the oil return circuit.

[0013] Optionally, the hydraulic control system further comprises a valve body, wherein a plurality of oil circuits and a plurality of sub-valves are provided in the valve body, wherein the plurality of sub-valves include the first one-way valve, the logic valve and the pressure relief valve; the plurality of oil circuits include a main oil inlet circuit, a main oil return circuit, a first oil circuit, a second oil circuit and a third oil circuit;

[0014] Wherein, one end of the main oil inlet oil circuit is provided with a first external connection interface for communicating with the reversing valve, and the other end is provided with a second external connection interface for communicating with a hydraulic source, and the first one-way valve is provided on the main oil inlet oil circuit;

[0015] One end of the main oil return line is provided with a third external connection interface for communicating with the reversing valve, and the other end is provided with a fourth external connection interface for communicating with the oil tank;

[0016] One end of the second oil circuit is connected to the main oil inlet circuit at the inlet of the first one-way valve, and the other end is connected to the main oil return circuit. The logic valve is provided on the second oil circuit.

[0017] The third oil circuit is connected to the main oil return circuit and to the control port of the logic valve, and the pressure relief valve is provided on the third oil circuit;

[0018] The first oil circuit is connected to the main oil inlet circuit at the outlet of the first one-way valve, the first oil circuit is connected to the control port of the pressure relief valve, and the first oil circuit is correspondingly provided with a fifth external connection interface, and the fifth external connection interface is used to communicate with the accumulator.

[0019] Optionally, the valve body is further provided with a pressure measurement connection interface and / or a temperature measurement connection interface;

[0020] The pressure measurement connection interface includes one or more of a sixth external connection interface, a seventh external connection interface, an eighth external connection interface, and a ninth external connection interface; wherein the sixth external connection interface is connected to the control port of the logic valve; the seventh external connection interface is connected to the main oil inlet circuit, and the connection position is located between the connection point where the main oil inlet circuit is connected to the second oil circuit and the second external connection interface; the eighth external connection interface is connected to the main oil inlet circuit, and the connection position is located between the connection point where the main oil inlet circuit is connected to the first oil circuit and the first external connection interface; the ninth external connection interface is connected to the first oil circuit;

[0021] The temperature measurement connection interface includes a tenth external connection interface and / or an eleventh external connection interface, the tenth external connection interface is connected to the main return oil circuit, and the connection position is located between the connection point where the main return oil circuit is connected to the third oil circuit and the third external connection interface; the eleventh external connection interface is connected to the main return oil circuit, and the connection position is located between the connection point where the main return oil circuit is connected to the third oil circuit and the fourth external connection interface.

[0022] In a second aspect, the present invention provides a battery box protection system, which includes a protective cover and the hydraulic control system as described in the first aspect above, wherein the protective cover can be movably arranged at the battery exchange channel of the vehicle, and the hydraulic actuator of the hydraulic control system is drive-connected to the protective cover.

[0023] Optionally, the battery box protection system also includes a cargo box, which includes a box body and a brim arranged at the front end of the box body, and the front end of the brim is formed with a first protective part and a battery exchange gap distributed along the left and right directions of the vehicle. The vehicle's cab is set below the first protective part, and the battery exchange gap is used to form the battery exchange channel. The protective cover and the brim are rotatably connected at the edge of the battery exchange gap.

[0024] Optionally, the battery box protection system further includes a pressure alarm switch and / or a position detection sensor;

[0025] Wherein, the pressure detection unit of the pressure alarm switch is arranged at the edge of the battery replacement gap and / or the bottom of the protective cover;

[0026] The position detection sensor is arranged on the brim of the hat and is located on the movement path of the protective cover to detect the position of the protective cover relative to the battery replacement gap.

[0027] In a third aspect, the present invention provides a wide-body vehicle, which includes the battery box protection system as described in the second aspect above.

[0028] In the hydraulic control system, battery box protection system and wide-body vehicle of the present invention, a hydraulic control system is used to control the opening or closing action of the protective cover. Specifically, a hydraulic actuator is used to drive the movement of the vehicle's protective cover, and a reversing valve is used to realize the movement reversal of the protective cover, so that the protective cover can open or close the battery exchange channel. When the battery exchange channel is opened, the battery exchange operation can be carried out. When the battery exchange channel is closed, protection can be formed for the battery box at the battery exchange channel to prevent external stones from moving through the battery exchange channel to the battery box and colliding with the battery box, thereby improving the safety performance of the battery box. In addition, a reversing valve is provided on the oil supply line of the reversing valve. An accumulator is installed. In special circumstances, such as when the hydraulic source has no liquid pressure, hydraulic oil can be supplied through the accumulator, so that the hydraulic actuator can still move or maintain the action state, thereby improving the endurance of the hydraulic control system; at the same time, the accumulator can also stabilize the pressure of the oil supply circuit to a certain extent, avoiding excessive fluctuations in the pressure difference between the two working oil ports of the reversing valve, resulting in excessive movement of the protective cover and collision with other components or even damage; the present invention can quickly and stably drive the protective cover of the vehicle to open or close the power exchange channel, and can work normally even when the hydraulic source has no liquid pressure, with strong endurance and high stability in use. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 A schematic structural diagram of a hydraulic control system in an embodiment of the present invention;

[0030] Figure 2 This is a schematic structural diagram of a battery box protection system in an embodiment of the present invention;

[0031] Figure 3 Another structural diagram of the battery box protection system in an embodiment of the present invention;

[0032] Figure 4 This is a schematic structural diagram of the telescopic cylinder connected to the brim and the protective cover respectively in an embodiment of the present invention.

[0033] Description of reference numerals:

[0034] 101 - Hydraulic actuator; 102 - Directional valve; 103 - Accumulator; 104 - First check valve; 105 - Logic valve; 106 - Pressure relief valve; 107 - Throttle valve; 108 - Overflow valve; 109 - Hydraulic source; 100 - Fuel tank; 110 - Oil supply line; 120 - Oil return line; 200 - Valve body; 210 - Main oil inlet line; 211 - First external connection interface; 212 - Second external connection interface; 220 - Main oil return line; 221 - Third external connection interface; 222 - Fourth external connection interface; 230 - First oil circuit; 231 - Fifth external connection interface; 240-second oil circuit; 250-third oil circuit; 251-sixth external connection interface; 260-fourth oil circuit; 261-seventh external connection interface; 270-fifth oil circuit; 271-eighth external connection interface; 232-ninth external connection interface; 272-tenth external connection interface; 262-eleventh external connection interface; 3-protective cover; 4-first pressure sensor; 5-pressure measuring connector; 6-temperature switch; 7-cargo box; 71-box body; 72-brim; 721-first protective part; 722-battery replacement gap; 8-position detection sensor; 91-cab; 92-battery box. DETAILED DESCRIPTION

[0035] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0036] In the description of the present invention, it should be noted that, unless otherwise specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to direct connections or indirect connections through an intermediary. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0037] Throughout this specification, reference to terms such as "an embodiment," "one embodiment," "some embodiments," "exemplarily," and "one embodiment" means that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or embodiment are included in at least one embodiment or embodiment of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or embodiment. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or embodiments.

[0038] The terms "first," "second," etc. are used for descriptive purposes only and should not be understood to indicate or imply relative importance or to implicitly specify the quantity of the technical features indicated. Thus, a feature specified as "first" or "second" may explicitly or implicitly include at least one of the features.

[0039] In the accompanying drawings, the Z-axis represents the vertical direction, that is, the up and down position, and the positive direction of the Z-axis (that is, the direction of the arrow of the Z-axis) represents the top, and the negative direction of the Z-axis (that is, the direction opposite to the positive direction of the Z-axis) represents the bottom; the X-axis in the accompanying drawings represents the horizontal direction and is designated as the left and right position, and the positive direction of the X-axis (that is, the direction of the arrow of the X-axis) represents the right side, and the negative direction of the X-axis (that is, the direction opposite to the positive direction of the X-axis) represents the left side; the Y-axis in the accompanying drawings represents the front and back position, and the positive direction of the Y-axis (that is, the direction of the arrow of the Y-axis) represents the front side, and the negative direction of the Y-axis (that is, the direction opposite to the positive direction of the Y-axis) represents the rear side; it should be noted that the aforementioned representations of the Z-axis, Y-axis, and X-axis are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be understood as limiting the present invention.

[0040] like Figure 1 and Figure 2 As shown, an embodiment of the present invention provides a hydraulic control system, which includes:

[0041] A hydraulic actuator 101 is used to drive and connect with the protective cover 3 of the vehicle and move the protective cover 3 relative to the battery box of the vehicle to open or close the battery replacement channel of the vehicle;

[0042] The reversing valve 102 is connected to the hydraulic actuator 101 and is used to control the action of the hydraulic actuator 101;

[0043] The accumulator 103 is connected to the oil supply passage 110 of the reversing valve 102 .

[0044] It should be noted that the installation position of the protective cover 3 on the vehicle is determined according to the layout of its battery exchange channel. The hydraulic actuator 101 can drive the protective cover 3 to move to open or close the battery exchange channel. For example, the hydraulic actuator 101 can be a rotary cylinder or a telescopic cylinder.

[0045] Specifically, the two working oil ports of the reversing valve 102 are respectively connected to the two oil ports of the hydraulic actuator 101, the oil inlet of the reversing valve 102 is used to communicate with the hydraulic source 109 through the oil supply line 110, and the oil return port of the reversing valve 102 is used to communicate with the oil tank 100 through the oil return line 120.

[0046] like Figure 1As shown, for example, taking the hydraulic actuator 101 as an example of a telescopic oil cylinder, when the Y1 electromagnet of the reversing valve 102 is energized and the Y2 electromagnet is de-energized, the valve core moves to the right, oil enters the rodless chamber of the telescopic oil cylinder, oil exits the rod chamber, and the telescopic rod of the telescopic oil cylinder extends, the Y1 electromagnet of the reversing valve 102 is energized and the Y2 electromagnet is energized, the valve core moves to the left, oil enters the rod chamber of the telescopic oil cylinder, oil exits the rodless chamber, and the telescopic rod of the telescopic oil cylinder retracts. These two states correspond to the states of opening or closing the protective cover 3 for power exchange, which will be explained later by way of example.

[0047] Thus, in the present invention, a hydraulic control system is used to control the opening or closing action of the protective cover 3. Specifically, a hydraulic actuator 101 is used to drive the movement of the protective cover 3 of the vehicle, and a reversing valve 102 is used to realize the movement reversal of the protective cover 3, so that the protective cover 3 can open or close the battery exchange channel. When the battery exchange channel is opened, the battery exchange operation can be performed. When the battery exchange channel is closed, protection can be formed for the battery box 92 at the battery exchange channel to prevent external stones from moving through the battery exchange channel to the battery box 92 and colliding with the battery box 92, thereby improving the safety performance of the battery box 92. In addition, an accumulator 103 is provided on the oil supply line 110 of the reversing valve 102. In special circumstances, such as when the hydraulic source 109 has no liquid pressure, hydraulic oil can be supplied through the accumulator 103, so that the hydraulic actuator 101 can still move or maintain the action state, thereby improving the endurance of the hydraulic control system; at the same time, the accumulator 103 can also stabilize the pressure of the oil supply circuit 110 to a certain extent, and avoid excessive fluctuations in the pressure difference between the two working oil ports of the reversing valve 102, which causes the protective cover 3 to move too much and collide with other components or even be damaged; the hydraulic control system of the present invention can quickly and stably drive the protective cover 3 of the vehicle to open or close the power exchange channel, and can work normally even when the hydraulic source 109 has no liquid pressure, and has strong endurance.

[0048] At this time, the accumulator 103 can be used to provide hydraulic pressure during battery replacement, and the independent power supply equipped on the vehicle outside the battery box 92 does not need to be set with a large capacity to meet the power demand for the hydraulic source 109, such as the hydraulic pump drive, during battery replacement.

[0049] like Figure 1 As shown, optionally, the hydraulic control system also includes a first one-way valve 104, which is arranged on the oil supply circuit 110, and the outlet of the first one-way valve 104 is arranged toward the reversing valve 102, and the accumulator 103 is connected to the oil supply circuit 110 at one end of the outlet of the first one-way valve 104.

[0050] It should be noted that the number and capacity of the accumulators 103 are determined according to specific needs. For example, two 10-liter accumulators 103 are used in the present invention.

[0051] In this way, when there is no hydraulic pressure at the hydraulic source 109, or the hydraulic pressure is less than the hydraulic pressure at the accumulator 103, the first one-way valve 104 can prevent the hydraulic oil flowing out of the accumulator 103 from flowing back to the hydraulic source 109, thereby avoiding the loss of hydraulic energy of the accumulator 103.

[0052] like Figure 1 As shown, optionally, the hydraulic control system also includes a logic valve 105 and a pressure relief valve 106; the inlet of the logic valve 105 is connected to the oil supply circuit 110 at the inlet end of the first one-way valve 104, the outlet of the logic valve 105 is connected to the return oil circuit 120 of the reversing valve 102, the control port of the logic valve 105 is connected to the inlet of the pressure relief valve 106, the outlet of the pressure relief valve 106 is connected to the return oil circuit 120, and the control port of the pressure relief valve 106 is connected to the oil supply circuit 110 at the outlet end of the first one-way valve 104.

[0053] For example, taking the required working fluid pressure of the hydraulic actuator 101 as the first pressure value, at this time, the control port of the pressure relief valve 106 is connected to the oil supply line 110. When the fluid pressure at the outlet of the first one-way valve 104 exceeds the first pressure value, the inlet and outlet of the pressure relief valve 106 are connected, and the fluid at the control port of the logic valve 105 flows back to the oil tank 100 through the pressure relief valve 106 and the return oil line 120. Then, the inlet and outlet of the logic valve 105 are connected, and the hydraulic oil at the inlet of the first one-way valve 104 flows back to the oil tank 100 through the logic valve 105 and the return oil line 120 until the fluid pressure at the outlet of the first one-way valve 104 is restored.

[0054] In this way, the system pressure at the outlet of the first one-way valve 104 can be maintained at the first pressure value through the pressure relief valve 106 and the logic valve 105, so that the telescopic cylinder can respond quickly when it needs to move.

[0055] like Figure 1 As shown, optionally, the hydraulic control system also includes a relief valve 108; the inlet of the relief valve 108 is connected to the oil supply circuit 110 at a second connecting position, the second connecting position is located between the connecting point where the oil supply circuit 110 is connected to the inlet of the logic valve 105 and the hydraulic source 109, and the outlet of the relief valve 108 is connected to the return oil circuit 120.

[0056] In this manner, the hydraulic oil exceeding the safety pressure of the logic valve 105 can be overflowed through the relief valve 108. For example, when the pressure of the hydraulic oil output by the hydraulic source 109 exceeds a second pressure value (the second pressure value is greater than the first pressure value), the relief valve 108 opens to prevent damage to components in the subsequent oil circuit. The second pressure value and the first pressure value can be selected as needed and are not explained here.

[0057] like Figure 1As shown, optionally, the hydraulic control system also includes a throttle valve 107; one end of the throttle valve 107 is connected to the oil supply circuit 110 at a first connecting position, the first connecting position is located between the connecting point where the oil supply circuit 110 is connected to the control port of the pressure relief valve 106 and the reversing valve 102, and the other end of the throttle valve 107 is connected to the oil return circuit 120.

[0058] Specifically, the throttle valve 107 has a normally closed valve body 200 structure. During normal use, the throttle valve 107 is in a closed state. When maintenance is required, the throttle valve 107 can be opened, allowing the hydraulic oil in the oil inlet circuit to flow through the throttle valve 107 and the oil return circuit 120 into the oil tank 100, completing the pressure relief of the hydraulic oil in the oil inlet circuit below the first pressure value, facilitating inspection and system maintenance. At this time, the hydraulic source 109 generally stops providing hydraulic pressure to the oil inlet circuit. For example, an on-off valve is provided near the hydraulic source 109 in the oil inlet circuit (this solution is not shown).

[0059] like Figure 1 As shown, optionally, the hydraulic control system further includes a valve body 200 ( Figure 1 The valve body 200 is provided with multiple oil circuits and multiple sub-valves, the multiple sub-valves including a first check valve 104, a logic valve 105 and a pressure relief valve 106; the multiple oil circuits include a main oil inlet oil circuit 210, a main oil return oil circuit 220, a first oil circuit 230, a second oil circuit 240 and a third oil circuit 250;

[0060] One end of the main oil inlet circuit 210 is provided with a first external connection interface 211 for communicating with (the oil inlet of) the reversing valve 102, and the other end is provided with a second external connection interface 212 for communicating with the hydraulic source 109. The first one-way valve 104 is provided on the main oil inlet circuit 210 (for example, the main oil inlet circuit 210 extends along a first direction and forms the first external connection interface 211 and the second external connection interface 212 at both ends, respectively);

[0061] One end of the main oil return line 220 is provided with a third external connection interface 221 for communicating with (the oil return port of) the reversing valve 102, and the other end is provided with a fourth external connection interface 222 for communicating with the oil tank 100 (for example, the main oil return line 220 is extended along the first direction);

[0062] One end of the second oil circuit 240 is connected to the main oil inlet circuit 210 at the inlet of the first one-way valve 104, and the other end is connected to the main oil return circuit 220. The second oil circuit 240 is provided with a logic valve 105;

[0063] The third oil circuit 250 is connected to the main oil return circuit 220 and is connected to the control port of the logic valve 105. The pressure relief valve 106 is provided on the third oil circuit 250.

[0064] The first oil circuit 230 is connected to the main oil inlet circuit 210 at the outlet of the first one-way valve 104, and the first oil circuit 230 is connected to the control port of the pressure relief valve 106. The first oil circuit 230 is correspondingly provided with a fifth external connection interface 231, and the fifth external connection interface 231 is used to communicate with the accumulator 103.

[0065] Illustratively, the main oil inlet circuit 210 and the main oil return circuit 220 are both extended in the first direction, and the first oil circuit 230, the second oil circuit 240 and the third oil circuit 250 are all extended in the second direction. The first direction and the second direction can be arranged at right angles.

[0066] It should be understood that the valve body 200 can be designed as a split structure or an integral structure. The split structure can reduce costs, while the integral structure can improve reliability.

[0067] In this way, the valve body 200 can integrate the main oil inlet circuit 210, the main oil return circuit 220, the first one-way valve 104, the logic valve 105 and the pressure relief valve 106, etc., which can reduce space occupancy and can provide interface quality to a certain extent and reduce the possibility of leakage.

[0068] Furthermore, the multiple sub-valves also include the aforementioned throttle valve 107 and / or overflow valve 108, and correspondingly, the multiple oil circuits also include a fourth oil circuit 260 and / or a fifth oil circuit 270; the fourth oil circuit 260 and the fifth oil circuit 270 are both extended along the second direction, and the two ends of the fourth oil circuit 260 are respectively connected to the main oil inlet circuit 210 and the main oil return circuit 220, the overflow valve 108 is arranged on the fourth oil circuit 260, and the two ends of the fifth oil circuit 270 are respectively connected to the main oil inlet circuit 210 and the main oil return circuit 220, and the throttle valve 107 is arranged on the fifth oil circuit 270.

[0069] like Figure 1 As shown, optionally, a pressure measuring connection interface and / or a temperature measuring connection interface is further provided on the valve body 200; wherein, the pressure measuring connection interface is used to connect to the first pressure sensor 4 or to connect to the pressure measuring joint 5, and the temperature measuring connection interface is used to connect to the temperature switch 6 or the plug. When the temperature switch 6 is triggered, corresponding protection operations can be performed, etc., which can adopt relevant technologies.

[0070] Furthermore, the pressure measurement connection interface includes one or more of a sixth external connection interface 251, a seventh external connection interface 261, an eighth external connection interface 271, and a ninth external connection interface 232; wherein the sixth external connection interface 251 (located at one end of the third oil circuit 250 and) is connected to the control port of the logic valve 105; the seventh external connection interface 261 is connected to the main oil inlet oil circuit 210, and the connection position is located between the connection point where the main oil inlet oil circuit 210 is connected to the second oil circuit 240 and the second external connection interface 212 (for example, the fourth oil circuit 260 is close to the end of the main oil inlet oil circuit 210 and penetrates the valve body 200 to form the seventh external connection interface). The eighth external connection interface 271 is in communication with the main oil inlet circuit 210, and the communication position is between the connection point between the main oil inlet circuit 210 and the first oil circuit 230 and the first external connection interface 211 (for example, one end of the fifth oil circuit 270 near the main oil inlet circuit 210 passes through the valve body 200 to form the eighth external connection interface 271); the ninth external connection interface 232 is in communication with the first oil circuit 230 (for example, both ends of the first oil circuit 230 pass through the valve body 200 to form the fifth external connection interface 231 at one end near the connection point with the main oil inlet circuit 210, and the ninth external connection interface 232 at the other end);

[0071] The temperature measurement connection interface includes a tenth external connection interface 272 and / or an eleventh external connection interface 262. The tenth external connection interface 272 is connected to the main return oil circuit 220, and the connection position is located between the connection point where the third oil circuit 250 is connected to the main return oil circuit 220 and the third external connection interface 221 (for example, one end of the fifth oil circuit 270 close to the main return oil circuit 220 passes through the valve body 200 and forms the tenth external connection interface 272); the eleventh external connection interface 262 is connected to the main return oil circuit 220, and the connection position is located between the connection point where the third oil circuit 250 is connected to the main return oil circuit 220 and the fourth external connection interface 222 (for example, one end of the fourth oil circuit 260 close to the main return oil circuit 220 passes through the valve body 200 and forms the eleventh external connection interface 262).

[0072] In this way, when necessary, pressure measurement operations can be performed at each pressure measurement connection interface to provide a reliable basis for determining the location of the hydraulic oil leakage inside the valve body 200, thereby facilitating rapid locating of the leakage point.

[0073] like Figures 2 to 4 As shown, another embodiment of the present invention provides a battery box protection system, which includes a protective cover 3 and a hydraulic control system as described in the above embodiment. The protective cover 3 can be movably arranged at the battery exchange channel of the vehicle, and the hydraulic actuator 101 of the hydraulic control system is driven and connected to the protective cover 3.

[0074] The battery box protection system has all the beneficial effects of the hydraulic control system and will not be described in detail here.

[0075] like Figure 2 As shown, optionally, the battery box protection system also includes a cargo box 7, which includes a box body 71 and a brim 72 arranged at the front end of the box body 71. The front end of the brim 72 is formed with a first protective portion 721 and a battery-exchange gap 722 distributed along the left and right directions of the vehicle. The lower part of the first protective portion 721 is used to set the vehicle's cab 91, and the battery-exchange gap 722 is used to form a battery-exchange channel. The protective cover 3 is rotatably connected to the brim 72.

[0076] In this case, the cab 91 and battery box 92 are distributed along the left and right directions of the wide-body vehicle. For example, the cab 91 is only provided on the left front end of the wide-body vehicle, and the battery box 92 and other components are arranged on the right side of the cab 91. However, it should be understood that if the wide-body vehicle is wide enough, the wide-body vehicle can also be equipped with two cabs 91 on the left and right, and the battery box 92 is arranged between the two cabs 91. This will not be explained in detail here.

[0077] It should be noted that in some methods, when replacing the battery, the battery box 92 is directly lifted out from the battery replacement gap 722, but in other methods, it is also possible to only lift the battery rack and battery inside the battery box 92 for replacement. This is not a limitation, and this manual will take the former case as an example for explanation.

[0078] In this way, the brim 72 of the cargo box 7 is used to form a first protective part 721 and a battery-exchange gap 722. The first protective part 721 can form a protection for the cab 91, and the battery-exchange gap 722 can form a battery-exchange channel. The first protective part 721 and the battery-exchange gap 722 are distributed along the left and right directions of the wide-body vehicle. At this time, the wide-body vehicle uses the space in the left and right directions where the front cab 91 is located to arrange the battery box 92, avoiding arranging the battery box 92 between the cab 91 and the front plate of the cargo box 7, and avoiding compressing the space of the wide-body vehicle in the front and rear directions. The spatial structure is reasonably arranged, and there is no need to significantly adjust the size of the wide-body vehicle cargo box 7 in the front and rear directions, and it is highly practical.

[0079] Optionally, the battery box protection system also includes a pressure alarm switch (not shown in the figure), and the pressure detection unit of the pressure alarm switch is arranged at the edge of the battery replacement gap 722 and / or the bottom of the protective cover 3.

[0080] For example, the detection value of the pressure detection unit of the pressure alarm switch set at the edge of the battery exchange gap 722 can reflect the collision between the battery box 92 or battery rack hoisted during battery exchange and the edge of the battery exchange gap 722. When the detection value exceeds the first preset value, an alarm can be issued to remind the battery exchange personnel to be careful. The detection value of the pressure detection unit of the pressure alarm switch at the bottom of the protective cover 3 can reflect the collision between the protective cover 3 and the lower components. For example, when the battery box 92 is deformed due to a wide-body vehicle collision and contacts the bottom of the protective cover 3, and the detection value exceeds the second preset value, an alarm can be issued. The hydraulic actuator 101 can also be controlled to move so that the protective cover 3 moves upward relative to the battery box 92 so that the detection value is within the preset range, thereby avoiding the protective cover 3 from forming excessive obstruction to the battery box 92 from above, causing the battery box 92 to bulge in other directions again and affecting the battery safety performance.

[0081] like Figure 3 As shown, optionally, the battery box protection system also includes a position detection sensor 8, which is arranged on the brim 72 and located on the movement path of the protective cover 3 to detect the position of the protective cover 3 relative to the battery replacement gap 722.

[0082] Exemplarily, the hydraulic actuator 101 is a telescopic oil cylinder. A notch is provided on the rear side wall of the brim 72 at the battery-swap notch 722. One end of the telescopic oil cylinder is hingedly connected to a first support provided in the notch, and the other end is hingedly connected to a second support provided at the bottom of the protective cover 3. A third support is provided on the protective cover 3, extending rearward beyond the rear edge of the protective cover. A fourth support is provided on the top of the brim 72, and the third and fourth supports are hingedly connected. The telescopic oil cylinder drives the protective cover 3 to switch between a first position that opens the battery-swap notch 722 and a second position that closes the battery-swap notch 722.

[0083] The position detection sensor 8 corresponds to the first position setting and / or the second position setting, which can avoid the telescopic cylinder from being overdriven and affecting its service life, or can avoid the telescopic cylinder from being driven into insufficient position and failing to play the expected protective role, or can avoid the protective cover 3 from colliding due to the battery replacement operation when the telescopic cylinder is not driven into sufficient position.

[0084] It should be understood that at this time, the side walls at the battery exchange gap 722 and the bottom of the protective cover 3 can be provided with anti-collision structures such as rubber pads, which will not be explained here.

[0085] Another embodiment of the present invention provides a wide-body vehicle, which includes the battery box protection system of the above embodiment.

[0086] Although the present disclosure is disclosed as above, the protection scope of the present disclosure is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present disclosure, and these changes and modifications will fall within the protection scope of the present invention.

Claims

1. A hydraulic control system, characterized in that: include: A hydraulic actuator (101), the hydraulic actuator (101) being used to drive and connect with a protective cover (3) of a vehicle and to move the protective cover (3) relative to a battery box of the vehicle to open or close a battery exchange channel of the vehicle; a reversing valve (102), the reversing valve (102) being connected to the hydraulic actuator (101) and used to control the action of the hydraulic actuator (101); an accumulator (103), the accumulator (103) being in communication with an oil supply passage (110) of the reversing valve (102); The hydraulic control system further comprises a first one-way valve (104), the first one-way valve (104) being arranged on the oil supply line (110), the outlet of the first one-way valve (104) being arranged toward the reversing valve (102), and the accumulator (103) being connected to the oil supply line (110) at one end of the outlet of the first one-way valve (104); The hydraulic control system further comprises a logic valve (105) and a pressure relief valve (106); the inlet of the logic valve (105) is connected to the oil supply circuit (110) at one end of the inlet of the first one-way valve (104), the outlet of the logic valve (105) is connected to the oil return circuit (120) of the reversing valve (102), the control port of the logic valve (105) is connected to the inlet of the pressure relief valve (106), the outlet of the pressure relief valve (106) is connected to the oil return circuit (120), and the control port of the pressure relief valve (106) is connected to the oil supply circuit (110) at one end of the outlet of the first one-way valve (104); The hydraulic control system further comprises a valve body (200), wherein a plurality of oil circuits and a plurality of sub-valves are provided in the valve body (200), wherein the plurality of sub-valves include the first one-way valve (104), the logic valve (105), and the pressure relief valve (106); the plurality of oil circuits include a main oil inlet circuit (210), a main oil return circuit (220), a first oil circuit (230), a second oil circuit (240), and a third oil circuit (250); One end of the main oil inlet circuit (210) is provided with a first external connection interface (211) for communicating with the reversing valve (102), and the other end is provided with a second external connection interface (212) for communicating with the hydraulic source (109), and the first one-way valve (104) is provided on the main oil inlet circuit (210); One end of the main oil return line (220) is provided with a third external connection interface (221) for communicating with the reversing valve (102), and the other end is provided with a fourth external connection interface (222) for communicating with the oil tank (100); One end of the second oil circuit (240) is connected to the main oil inlet circuit (210) at the inlet of the first one-way valve (104), and the other end is connected to the main oil return circuit (220). The logic valve (105) is provided on the second oil circuit (240); The third oil circuit (250) is in communication with the main oil return circuit (220) and is in communication with the control port of the logic valve (105). The pressure relief valve (106) is provided on the third oil circuit (250). The first oil circuit (230) is connected to the main oil inlet circuit (210) at the outlet of the first one-way valve (104), the first oil circuit (230) is connected to the control port of the pressure relief valve (106), and the first oil circuit (230) is correspondingly provided with a fifth external connection interface (231), and the fifth external connection interface (231) is used to communicate with the accumulator (103).

2. The hydraulic control system according to claim 1, wherein: It also includes a throttle valve (107) and / or a relief valve (108); one end of the throttle valve (107) is connected to the oil supply line (110) at a first communication position, the first communication position being located between the connection point where the oil supply line (110) is connected to the control port of the pressure relief valve (106) and the reversing valve (102); the other end of the throttle valve (107) is connected to the oil return line (120); The inlet of the overflow valve (108) is connected to the oil supply circuit (110) at a second connection position, and the second connection position is located between the connection point where the oil supply circuit (110) is connected to the inlet of the logic valve (105) and the hydraulic source (109), and the outlet of the overflow valve (108) is connected to the oil return circuit (120).

3. The hydraulic control system according to claim 1 or 2, characterized in that: The valve body (200) is also provided with a pressure measurement connection interface and / or a temperature measurement connection interface; The pressure measurement connection interface includes one or more of a sixth external connection interface (251), a seventh external connection interface (261), an eighth external connection interface (271), and a ninth external connection interface (232); wherein the sixth external connection interface (251) is in communication with the control port of the logic valve (105); the seventh external connection interface (261) is in communication with the main oil inlet circuit (210), and the communication position is located between the connection point where the main oil inlet circuit (210) is in communication with the second oil circuit (240) and the second external connection interface (212); the eighth external connection interface (271) is in communication with the main oil inlet circuit (210), and the communication position is located between the connection point where the main oil inlet circuit (210) is in communication with the first oil circuit (230) and the first external connection interface (211); the ninth external connection interface (232) is in communication with the first oil circuit (230); The temperature measurement connection interface includes a tenth external connection interface (272) and / or an eleventh external connection interface (262), wherein the tenth external connection interface (272) is connected to the main oil return circuit (220), and the connection position is located between the connection point where the main oil return circuit (220) is connected to the third oil circuit (250) and the third external connection interface (221); and the eleventh external connection interface (262) is connected to the main oil return circuit (220), and the connection position is located between the connection point where the main oil return circuit (220) is connected to the third oil circuit (250) and the fourth external connection interface (222).

4. A battery box protection system, characterized in that: The invention comprises a protective cover (3) and a hydraulic control system according to any one of claims 1 to 3, wherein the protective cover (3) is movably arranged at a battery exchange channel of a vehicle, and a hydraulic actuator (101) of the hydraulic control system is drive-connected to the protective cover (3).

5. The battery box protection system according to claim 4, characterized in that: The vehicle further comprises a cargo box (7), wherein the cargo box (7) comprises a box body (71) and a brim (72) arranged at the front end of the box body (71), wherein the front end of the brim (72) is formed with a first protective portion (721) and a battery-exchange notch (722) distributed along the left-right direction of the vehicle, wherein the driver's cab (91) of the vehicle is arranged below the first protective portion (721), and the battery-exchange notch (722) is used to form the battery-exchange channel, and the protective cover (3) is rotatably connected to the brim (72) at the edge of the battery-exchange notch (722).

6. The battery box protection system according to claim 5, characterized in that: Also includes a pressure alarm switch and / or a position detection sensor (8); Wherein, the pressure detection unit of the pressure alarm switch is arranged at the edge of the battery replacement gap (722) and / or the bottom of the protective cover (3); The position detection sensor (8) is arranged on the brim (72) and is located on the movement path of the protective cover (3) to detect the position of the protective cover (3) relative to the battery replacement notch (722).

7. A wide-body vehicle, characterized in that: Comprising the battery box protection system as described in any one of claims 4 to 6.

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