Tank cover opening and closing locking control system and sewage suction truck

Abstract

The utility model discloses a tank cover opening and closing locking control system and a sewage suction truck, the control system comprises an oil supply device, a locking hydraulic device and an opening and closing hydraulic device, an oil inlet of a locking reversing valve of the locking hydraulic device is communicated with the oil supply device; a locking working oil port of the locking reversing valve is communicated with rodless cavities of the first locking oil cylinder and the second locking oil cylinder respectively, an unlocking working oil port of the locking reversing valve is communicated with rod cavities of the first locking oil cylinder and the second locking oil cylinder respectively, and the first locking oil cylinder is provided with a damping body for delaying action of the oil cylinders. An oil inlet of an opening and closing reversing valve of the opening and closing hydraulic device is communicated with the oil supply device, and an opening working oil port and a closing working oil port of the opening and closing reversing valve are communicated with a rodless cavity and a rod cavity of an opening and closing oil cylinder in a one-to-one correspondence mode respectively. When the unlocking action of the first locking oil cylinder is in place, the opening and closing reversing valve is switched to the opening working oil port to be communicated with the opening and closing oil inlet, and the damping body is additionally arranged, so that the sequence reliability of the opening, closing and locking actions of the tank cover is guaranteed in the unlocking and uncovering process.

Description

Technical Field

[0001] The utility model belongs to the technical field of hydraulic control, and in particular relates to a tank cover opening, closing and locking control system and a sewage suction truck. Background Art

[0002] Sewage suction trucks are used to collect, transfer, clean and transport sludge and sewage in urban or community sewers. After sucking up the sludge, it needs to be transported to the designated discharge point. Therefore, during transportation, in order to avoid pollution to the environment, the sealing requirements for the tank cover are very high.

[0003] Most of the current sewage suction trucks are tank trucks, and the tank cover and the tank body are connected in a hinged manner to ensure that the tank cover can be opened and closed freely, and the opening and closing of the tank cover is driven by the opening and closing cylinder. In order to ensure a reliable seal between the tank cover and the tank body, when the tank cover is closed, there will be an array of latches or other locking mechanisms to make the tank cover fit tightly on the tank body. However, in the existing technical solution, the action of the opening and closing cylinder and the latch cylinder is controlled by a hydraulic sequence valve, and the viscosity of the hydraulic oil is greatly affected by the ambient temperature, which will affect the hydraulic sequence action and easily cause action disorder. Utility Model Content

[0004] In view of the above-mentioned defects or shortcomings, the utility model provides a tank cover opening, closing and locking control system and a sewage suction truck, which aims to solve the technical problem that the hydraulic sequence valve controlling the action of the opening and closing cylinder and the latch cylinder is greatly affected by the ambient temperature and easily causes action disorder.

[0005] To achieve the above-mentioned purpose, the utility model provides a tank cover opening and closing locking control system in the first aspect, wherein the tank cover opening and closing locking control system includes an oil supply device, a locking hydraulic device and an opening and closing hydraulic device; the locking hydraulic device includes a locking reversing valve, a first locking oil cylinder and a second locking oil cylinder, the locking oil inlet of the locking reversing valve is connected to the oil supply device, the locking working oil port of the locking reversing valve is respectively connected to the rodless chamber of the first locking oil cylinder and the second locking oil cylinder, and the unlocking working oil port of the locking reversing valve is respectively connected to the first locking oil cylinder and the rodless chamber of the second locking oil cylinder. The rod chambers of the locking cylinder and the second locking cylinder are connected, and the first locking cylinder is provided with a damping body for delaying the movement of the cylinder; the opening and closing hydraulic device includes an opening and closing reversing valve and an opening and closing cylinder, the opening and closing oil inlet of the opening and closing reversing valve is connected with the oil supply device, the opening working oil port and the closing working oil port of the opening and closing reversing valve are respectively connected with the rodless chamber and the rod chamber of the opening and closing cylinder in a one-to-one correspondence, and the opening and closing reversing valve is used to switch to the opening working oil port to be connected with the opening and closing oil inlet when the unlocking action of the first locking cylinder is in place.

[0006] In an embodiment of the utility model, the tank cover opening and closing locking control system also includes a locking position sensing device for detecting the position of the latch member on the first locking mechanism, and the locking position sensing device is used to trigger when the unlocking action of the first locking cylinder is in place.

[0007] In an embodiment of the utility model, the locking position sensing device includes a locking trigger, an unlocking proximity switch and a locking proximity switch. The locking trigger is arranged on the latch member of the first locking cylinder and can move between the unlocking proximity switch and the locking proximity switch. The locking trigger is used to trigger the unlocking proximity switch when the unlocking action is in place and to trigger the locking proximity switch when the locking action is in place.

[0008] In an embodiment of the utility model, the number of the second locking cylinders is three, the rodless chambers of the three second locking cylinders are all connected to the locking working oil port of the locking reversing valve, and the rod chambers of the three second locking cylinders are all connected to the unlocking working oil port of the locking reversing valve.

[0009] In the embodiment of the utility model, the locking working oil port and the unlocking working oil port of the locking reversing valve are respectively connected to the same hydraulic lock.

[0010] In an embodiment of the utility model, there are two opening and closing cylinders, the rodless chambers of the two opening and closing cylinders are connected to the opening working oil port of the opening and closing reversing valve, and the rod chambers of the two opening and closing cylinders are connected to the closing working oil port of the opening and closing reversing valve.

[0011] In an embodiment of the utility model, the tank cover opening, closing and locking control system also includes a closed position sensing device, which includes a closed position sensing device and a closed proximity switch. The closed proximity switch is arranged on the tank body, and the closed trigger is arranged on the tank cover corresponding to the closed proximity switch. The closed trigger is used to trigger the closed proximity switch when the tank cover is initially closed in place, so as to control the locking reversing valve to switch to the locking working oil port and connect with the locking oil inlet.

[0012] In an embodiment of the utility model, the oil supply device includes an oil tank and a gear pump. The oil inlet of the gear pump is connected to the oil tank, and the oil outlet of the gear pump is respectively connected to the locking oil inlet and the opening and closing oil inlet, and the output end of the gear pump is connected to a power take-off.

[0013] In an embodiment of the utility model, the tank cover opening, closing and locking control system also includes an overflow hydraulic device, which includes an overflow valve and an overflow reversing valve. The overflow oil inlet of the overflow reversing valve is connected to the oil supply pipeline of the oil supply device through an overflow oil inlet pipeline. The overflow reversing valve is used to switch between the overflow return oil port and the overflow working oil port to select one of them to be connected to the overflow oil inlet. The inlet port of the overflow valve is connected to the overflow oil inlet pipeline, and the outlet port of the overflow valve is connected back to the oil tank of the oil supply device.

[0014] To achieve the above-mentioned object, the second aspect of the utility model provides a sewage suction truck, wherein the sewage suction truck includes the tank cover opening, closing and locking control system according to the above-mentioned.

[0015] Through the above technical solution, the tank cover opening, closing and locking control system provided by the embodiment of the utility model has the following beneficial effects:

[0016] When the above-mentioned tank cover opening and closing locking control system is used, since it includes an oil supply device, a locking hydraulic device and an opening and closing hydraulic device, the locking hydraulic device has a first locking oil cylinder and a second locking oil cylinder. When the locking reversing valve is controlled to switch to the locking working oil port and the locking oil inlet port are connected, the piston rod ends of the first locking oil cylinder and the second locking oil cylinder extend and perform the locking action of the tank cover. When the locking reversing valve is controlled to switch to the unlocking working oil port and the locking oil inlet port are connected, the piston rod ends of the first locking oil cylinder and the second locking oil cylinder retract and perform the unlocking action of the tank cover. In addition, a damping body for delaying the action of the cylinder is provided on the first locking oil cylinder. Then the The locking action and the unlocking action are completed later than the second locking cylinder. Only by monitoring the unlocking action of the first locking cylinder, it is possible to determine whether the first locking cylinder and the second locking cylinder have completed the unlocking action. When it is determined that the unlocking action of the first locking cylinder is in place, the opening and closing reversing valve of the opening and closing hydraulic device is controlled to switch to the opening working oil port and the opening and closing oil inlet port, so that the piston rod end of the opening and closing cylinder extends out and drives the tank cover to be opened. The addition of the damping body eliminates the need to set a hydraulic sequence valve to control the unlocking and opening of the cover, and is not affected by the ambient temperature. The reliability of the action sequence of the tank cover opening, closing and locking is guaranteed.

[0017] Other features and advantages of the present invention will be described in detail in the subsequent specific implementation section. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings are used to provide a further understanding of the embodiments of the present utility model and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the embodiments of the present utility model, but do not constitute a limitation on the embodiments of the present utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without creative work. In the drawings:

[0019] Figure 1 It is a structural schematic diagram of a tank cover opening, closing and locking control system according to one embodiment of the utility model.

[0020] Description of Reference Numerals

[0021] 100 Oil supply device 110 Oil tank

[0022] 120 Gear Pump 121 Power Take-off

[0023] 210 Locking reversing valve 220 First locking cylinder

[0024] 230 Second locking cylinder 240 Latch

[0025] 250 Damping body 310 Open and close reversing valve

[0026] 320 Opening and closing cylinder 400 Locking position sensing device

[0027] 410 Unlock proximity switch 420 Lock proximity switch

[0028] 500 Closed proximity switch 600 Hydraulic lock

[0029] 700 Overflow hydraulic device 710 Overflow reversing valve

[0030] 720 Overflow Valve 800 Tank Cover DETAILED DESCRIPTION

[0031] The specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0032] The tank cover opening, closing and locking control system and the sewage suction vehicle of the present invention are described below with reference to the accompanying drawings.

[0033] like Figure 1 As shown, the utility model provides a tank cover opening, closing and locking control system, wherein the tank cover opening, closing and locking control system comprises:

[0034] Oil supply device 100;

[0035] The locking hydraulic device comprises a locking reversing valve 210, a first locking oil cylinder 220 and a second locking oil cylinder 230, wherein the locking oil inlet of the locking reversing valve 210 is communicated with the oil supply device 100, the locking working oil port of the locking reversing valve 210 is communicated with the rodless chambers of the first locking oil cylinder 220 and the second locking oil cylinder 230 respectively, the unlocking working oil port of the locking reversing valve 210 is communicated with the rod chambers of the first locking oil cylinder 220 and the second locking oil cylinder 230 respectively, and the first locking oil cylinder 220 is provided with a damping body 250 for delaying the action of the oil cylinder;

[0036] The opening and closing hydraulic device includes an opening and closing reversing valve 310 and an opening and closing cylinder 320. The opening and closing oil inlet of the opening and closing reversing valve 310 is connected to the oil supply device 100. The opening working oil port and the closing working oil port of the opening and closing reversing valve 310 are respectively connected to the rodless chamber and the rod chamber of the opening and closing cylinder 320 in a one-to-one correspondence, and the opening and closing reversing valve 310 is used to switch to the opening working oil port to be connected to the opening and closing oil inlet when the unlocking action of the first locking cylinder 220 is in place.

[0037] When the above-mentioned tank cover opening and closing locking control system is used, since it includes an oil supply device 100, a locking hydraulic device and an opening and closing hydraulic device, the locking hydraulic device has a first locking cylinder 220 and a second locking cylinder 230. When the locking reversing valve 210 is controlled to switch to the locking working oil port and the locking oil inlet, the piston rod ends of the first locking cylinder 220 and the second locking cylinder 230 extend and perform the locking action of the tank cover 800. When the locking reversing valve 210 is controlled to switch to the unlocking working oil port and the locking oil inlet, the piston rod ends of the first locking cylinder 220 and the second locking cylinder 230 retract and perform the unlocking action of the tank cover 800. The first locking cylinder 220 is provided with a damping body 250 for delaying the cylinder action. The locking action and unlocking action of the first locking cylinder 220 are completed later than those of the second locking cylinder 230. It is only necessary to monitor the unlocking action of the first locking cylinder 220 to determine whether the first locking cylinder 220 and the second locking cylinder 230 have completed the unlocking action. When it is determined that the unlocking action of the first locking cylinder 220 is in place, the opening and closing reversing valve 310 of the opening and closing hydraulic device is controlled to switch to the opening working oil port and the opening and closing oil inlet port, so that the piston rod end of the opening and closing cylinder 320 extends out and drives the tank cover 800 to be opened. The addition of the damping body makes it unnecessary to set a hydraulic sequence valve during the unlocking and opening control process, and it is not affected by the ambient temperature, so the reliability of the tank cover opening, closing and locking action sequence is guaranteed.

[0038] It can be understood that the first locking oil cylinder 220 and the second locking oil cylinder 230 are both arranged on the tank body, and the piston rod ends of the first locking oil cylinder 220 and the second locking oil cylinder 230 are both connected with a latch member 240, and the tank cover 800 is provided with a latch opening for the latch member 240 to extend into or withdraw from the position corresponding to the first locking oil cylinder 220 and the second locking oil cylinder 230, so as to realize locking or unlocking the tank cover 800 on the tank body. At the same time, as mentioned above, the switching of the locking action and the unlocking action of the first locking oil cylinder 220 and the second locking oil cylinder 230 is realized by controlling the locking reversing valve 210. In addition, the top of the tank cover 800 is movably hinged on the tank body, the cylinder end of the opening and closing cylinder 320 is connected to the tank body, and the piston rod end is connected to the tank cover 800, and then by controlling the opening and closing reversing valve 310 to switch between the open working oil port and the closed working oil port, one of which is connected to the opening and closing oil inlet, the opening and closing cylinder 320 can be extended to open the tank cover 800 or the opening and closing cylinder 320 can be retracted to close the tank cover 800.

[0039] Specifically, the damping body 250 of the first locking cylinder 220 can be set as an elastic damper or a damping plug. Of course, the present invention is not limited to this. All damping structures that can delay the cylinder action should fall within the protection scope of the present invention.

[0040] See also Figure 1 In the embodiment of the utility model, the tank cover opening and closing locking control system further includes a locking position sensing device 400 for detecting the position of the latch member 240 on the first locking oil cylinder 220, and the locking position sensing device 400 is used to be triggered when the unlocking action of the first locking oil cylinder 220 is in place. It can be understood that before unlocking, the latch member 240 of the first locking oil cylinder 220 extends into the latch port, and the position of the latch member 240 is the preset locking position. When unlocking, the first locking oil cylinder 220 retracts and drives the latch member 240 to withdraw from the latch port until the first locking oil cylinder 220 retracts to the limit position, and the position of the latch member 240 is the preset unlocking position, thereby achieving unlocking. The locking position sensing device 400 detects the position of the latch 240, and can judge whether the unlocking action of the first locking oil cylinder 220 is in place. If it is determined that the unlocking action is in place, the locking position sensing device 400 is triggered, so that the opening and closing reversing valve 310 can be switched to open the working oil port and connect with the opening and closing oil inlet according to the triggering of the locking position sensing device 400; if it is determined that the unlocking action is not in place, the locking position sensing device 400 is not triggered. Of course, the utility model is not limited to this, and the judgment of whether the unlocking action of the first locking oil cylinder 220 is in place can also be determined by detecting the telescopic length of the piston rod of the first locking oil cylinder 220.

[0041] In the embodiment of the utility model, the locking position sensing device 400 includes a locking trigger, an unlocking proximity switch 410 and a locking proximity switch 420. The locking trigger is arranged on the latch 240 of the first locking oil cylinder 220 and can move between the unlocking proximity switch 410 and the locking proximity switch 420. The locking trigger is used to trigger the unlocking proximity switch 410 when the unlocking action is in place and to trigger the locking proximity switch 420 when the locking action is in place. That is, the position of the latch 240 can be detected by setting a proximity switch, and the proximity switch can accurately reflect the position of the motion mechanism. Its positioning accuracy, service life, convenience of installation and adjustment, and applicability to harsh environments are incomparable to general mechanical travel switches. At the same time, not only is there provided an unlocking proximity switch 410 for detecting whether the latch member 240 has moved to a preset unlocking position, but there is also provided a locking proximity switch 420 for detecting whether the latch member 240 has moved to a preset locking position. When the unlocking proximity switch 410 is triggered, it is proved that the unlocking action of the first locking cylinder 220 is in place, and the first locking cylinder 220 can be controlled to stop driving and generate an instruction to switch the opening and closing reversing valve 310 to open the working oil port and connect it to the opening and closing oil inlet; when the locking proximity switch 420 is triggered, it is proved that the locking action of the first locking cylinder 220 is in place, and the first locking cylinder 220 can be controlled to stop driving.

[0042] Furthermore, the locking trigger is arranged on one end of the latch member 240 close to the first locking cylinder 220, and can be extended into the latch opening at one end of the latch member 240 away from the first locking cylinder 220, while the portion of the latch member 240 with the locking trigger does not extend into the latch opening.

[0043] Furthermore, the tank cover opening, closing and locking control system also includes a control device, which is respectively communicated with the unlocking proximity switch 410, the locking proximity switch 420, the locking reversing valve 210 and the opening and closing reversing valve 310. When the control device receives the trigger signal of the unlocking proximity switch 410, it can control the opening and closing reversing valve 310 to switch to open the working oil port and connect it to the opening and closing oil inlet.

[0044] Please see again Figure 1In the embodiment of the utility model, the number of the second locking oil cylinders 230 can be three, and the rodless chambers of the three second locking oil cylinders 230 are all connected to the locking working oil port of the locking reversing valve 210, and the rod chambers of the three second locking oil cylinders 230 are all connected to the unlocking working oil port of the locking reversing valve 210. That is, the tank cover opening and closing locking control system has a first locking oil cylinder 220 and three second locking oil cylinders 230, a total of four locking oil cylinders, of which two locking oil cylinders lock the upper part of the tank cover 800 on the left and right sides of the tank cover 800, and the other two locking oil cylinders lock the lower part of the tank cover 800 on the left and right sides of the tank cover 800, thereby ensuring the reliability of locking and sealing. At the same time, one of the four locking cylinders, namely the first locking cylinder 220, is provided with a damping body 250 for delaying the cylinder action, and when judging whether the locking action and the unlocking action are in place, only the first locking cylinder 220 needs to be tested, and the other three second locking cylinders 230 do not need to be tested.

[0045] In the embodiment of the utility model, the locking working oil port and the unlocking working oil port of the locking reversing valve 210 are respectively connected to the same hydraulic lock 600. Specifically, one end of the hydraulic lock 600 is connected to the working oil port, and the other end is connected to the rodless chamber or the rod chamber of the locking oil cylinder. By adding the hydraulic lock 600, it can play a role in maintaining pressure when oil is not supplied, avoiding the poor sealing of the tank cover of the suction tank and avoiding leakage.

[0046] In the embodiment of the utility model, the number of the opening and closing oil cylinders 320 can be two, and the rodless chambers of the two opening and closing oil cylinders 320 are both connected to the opening working oil port of the opening and closing reversing valve 310, and the rod chambers of the two opening and closing oil cylinders 320 are both connected to the closing working oil port of the opening and closing reversing valve 310. The number of the opening and closing oil cylinders 320 is set to two, so that the stability of opening and closing can be guaranteed. In addition, the two opening and closing oil cylinders 320 are controlled by the same opening and closing reversing valve 310, so as to ensure the synchronization of the control of the two opening and closing oil cylinders 320.

[0047] In the embodiment of the utility model, the tank cover opening, closing and locking control system also includes a closed position sensing device, which includes a closed trigger and a closed proximity switch 500. The closed proximity switch 500 is arranged on the tank body, and the closed trigger is arranged on the tank cover 800 corresponding to the closed proximity switch 500. The closed trigger is used to trigger the closed proximity switch 500 when the tank cover 800 is initially closed in place, so as to control the locking reversing valve 210 to switch to the locking working oil port and the locking oil inlet. By adding the closed position sensing device, the actions of the opening and closing oil cylinder 320 and the locking oil cylinder can be sequentially controlled during the closing and locking process, and there is no need to add a hydraulic sequence valve to achieve this, which further improves the reliability of the action sequence.

[0048] In the embodiment of the utility model, the oil supply device 100 includes an oil tank 110 and a gear pump 120. The oil inlet of the gear pump 120 is connected to the oil tank 110, and the oil outlet of the gear pump 120 is respectively connected to the locking oil inlet and the opening and closing oil inlet, and the output end of the gear pump 120 is connected to a power take-off 121. If the oil pumping part of the oil supply device 100 is set as the gear pump 120, not only can the efficient and stable delivery of oil be achieved, but also the power take-off 121 can be switched to be used for force transmission.

[0049] In an embodiment of the utility model, the tank cover opening, closing and locking control system also includes an overflow hydraulic device 700, which includes an overflow valve 720 and an overflow reversing valve 710. The overflow oil inlet of the overflow reversing valve 710 is connected to the oil supply pipeline of the oil supply device 100 through the overflow oil inlet pipeline. The overflow reversing valve 710 is used to switch between the overflow return oil port and the overflow working oil port to select one of them to be connected to the overflow oil inlet. The inlet port of the overflow valve 720 is connected to the overflow oil inlet pipeline, and the outlet port of the overflow valve 720 is connected back to the oil tank 110 of the oil supply device 100. By adding the overflow hydraulic device 700, the overflow reversing valve 710 can be de-energized while the tank cover 800 is kept stably closed, and the overflow oil inlet of the overflow reversing valve 710 is directly connected to the overflow oil return port. At this time, the gear pump 120 can transmit force through the power take-off 121; when the tank cover 800 is unlocked and opened or closed and locked, the overflow reversing valve 710 is energized, and the overflow oil inlet of the overflow reversing valve 710 is switched to be connected to the overflow working oil port. At this time, the overflow valve 720 on the overflow oil inlet pipeline can stabilize the system oil pressure. When the oil pressure in the system reaches the set oil pressure of the overflow valve 720, the overflow valve 720 opens, and the oil flows back to the oil tank 110, and the system is depressurized.

[0050] Specifically, the overflow hydraulic device 700 , the opening and closing hydraulic device and the locking hydraulic device are sequentially arranged along the oil supply pipeline of the oil supply device 100 .

[0051] In addition, the second aspect of the utility model provides a sewage suction truck, wherein the sewage suction truck includes the tank cover opening, closing and locking control system described above. Since the sewage suction truck adopts all the technical solutions of the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here one by one.

[0052] In the description of the present invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0053] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0054] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0055] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations of the present invention. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A tank cover opening, closing and locking control system, characterized in that: The tank cover opening, closing and locking control system comprises: Oil supply device (100); A locking hydraulic device, comprising a locking reversing valve (210), a first locking oil cylinder (220) and a second locking oil cylinder (230); a locking oil inlet of the locking reversing valve (210) is communicated with the oil supply device (100); a locking working oil port of the locking reversing valve (210) is communicated with the rodless chambers of the first locking oil cylinder (220) and the second locking oil cylinder (230), respectively; an unlocking working oil port of the locking reversing valve (210) is communicated with the rod chambers of the first locking oil cylinder (220) and the second locking oil cylinder (230), respectively; and a damping body (250) for delaying the cylinder action is provided on the first locking oil cylinder (220); An opening and closing hydraulic device comprises an opening and closing reversing valve (310) and an opening and closing oil cylinder (320), wherein the opening and closing oil inlet of the opening and closing reversing valve (310) is connected to the oil supply device (100), the opening working oil port and the closing working oil port of the opening and closing reversing valve (310) are respectively connected to the rodless chamber and the rod chamber of the opening and closing oil cylinder (320) in a one-to-one correspondence, and the opening and closing reversing valve (310) is used to switch to the opening working oil port to be connected to the opening and closing oil inlet when the unlocking action of the first locking oil cylinder (220) is in place.

2. The tank cover opening, closing and locking control system according to claim 1, characterized in that: The tank lid opening, closing and locking control system further comprises a locking position sensing device (400) for detecting the position of the latch member (240) on the first locking cylinder (220), wherein the locking position sensing device (400) is used to be triggered when the unlocking action of the first locking cylinder (220) is in place.

3. The tank cover opening, closing and locking control system according to claim 2, characterized in that: The locking position sensing device (400) comprises a locking trigger, an unlocking proximity switch (410) and a locking proximity switch (420); the locking trigger is arranged on a latch member (240) of the first locking oil cylinder (220) and can move between the unlocking proximity switch (410) and the locking proximity switch (420); the locking trigger is used to trigger the unlocking proximity switch (410) when the unlocking action is in place and to trigger the locking proximity switch (420) when the locking action is in place.

4. The tank cover opening, closing and locking control system according to claim 1, characterized in that: The number of the second locking cylinders (230) is three, the rodless chambers of the three second locking cylinders (230) are all connected to the locking working oil port of the locking reversing valve (210), and the rod chambers of the three second locking cylinders (230) are all connected to the unlocking working oil port of the locking reversing valve (210).

5. The tank cover opening, closing and locking control system according to claim 1, characterized in that: The locking working oil port and the unlocking working oil port of the locking reversing valve (210) are respectively connected to the same hydraulic lock (600).

6. The tank cover opening, closing and locking control system according to any one of claims 1 to 5, characterized in that: The number of the opening and closing oil cylinders (320) is two, and the rodless chambers of the two opening and closing oil cylinders (320) are both connected to the opening working oil port of the opening and closing reversing valve (310), and the rod chambers of the two opening and closing oil cylinders (320) are both connected to the closing working oil port of the opening and closing reversing valve (310).

7. The tank cover opening, closing and locking control system according to any one of claims 1 to 5, characterized in that: The tank cover opening, closing and locking control system further comprises a closed position sensing device, the closed position sensing device comprising a closed trigger and a closed proximity switch (500), the closed proximity switch (500) being arranged on the tank body, the closed trigger being arranged on the tank cover (800) corresponding to the closed proximity switch (500), the closed trigger being used to trigger the closed proximity switch (500) when the tank cover (800) is initially closed in place, so as to control the locking reversing valve (210) to switch to the locking working oil port to communicate with the locking oil inlet port.

8. The tank cover opening, closing and locking control system according to any one of claims 1 to 5, characterized in that: The oil supply device (100) comprises an oil tank (110) and a gear pump (120); an oil inlet of the gear pump (120) is connected to the oil tank (110); an oil outlet of the gear pump (120) is respectively connected to the locking oil inlet and the opening and closing oil inlet; and an output end of the gear pump (120) is connected to a power take-off (121).

9. The tank cover opening, closing and locking control system according to any one of claims 1 to 5, characterized in that: The tank cover opening, closing and locking control system also includes an overflow hydraulic device (700), the overflow hydraulic device (700) includes an overflow valve (720) and an overflow reversing valve (710), the overflow oil inlet of the overflow reversing valve (710) is connected to the oil supply pipeline of the oil supply device (100) through an overflow oil inlet pipeline, the overflow reversing valve (710) is used to switch between an overflow oil return port and an overflow working oil port to select one to be connected to the overflow oil inlet, the valve inlet of the overflow valve (720) is connected to the overflow oil inlet pipeline, and the valve outlet of the overflow valve (720) is connected back to the oil tank (110) of the oil supply device (100).

10. A sewage suction truck, characterized in that: The sewage suction truck comprises a tank cover opening, closing and locking control system according to any one of claims 1 to 9.

Images