Locking device and sewage suction truck

Abstract

The locking device is used for connecting a vehicle frame and a sewage suction tank body and comprises at least one support and at least one locking assembly, the support is used for being connected with the sewage suction tank body, the locking assembly comprises a locking piece and a driving piece, the locking piece is arranged relative to the vehicle frame and is connected to the support in a sliding mode, and the driving piece is arranged on the support. The driving part is provided with a fixed end and a movable end, the fixed end of the driving part is connected to the support, the movable end of the driving part is connected to the locking part, and the driving part is used for driving the locking part to be connected with the vehicle frame in a clamped mode or to be disengaged from the vehicle frame in a sliding mode so that the sewage suction tank can be detachably connected to the vehicle frame. According to the utility model, the problem that the hydraulic cylinder and components are easily abraded or damaged due to overlarge local stress sudden change of the lifting hydraulic cylinder, the tank body and the auxiliary frame lap joint bearing structural components caused by impact vibration can be effectively solved.

Description

Technical Field

[0001] The utility model relates to the technical field of automobile manufacturing, and particularly relates to a locking device and a sewage suction truck. Background Art

[0002] At present, the sewage suction truck generally uses a lifting device arranged at the front or middle of the tank body to lift the tank body to a set angle, and then opens the rear cover of the tank body, and the materials are discharged from the tank body under the action of gravity to realize unloading.

[0003] For example, the Chinese utility model patent with the application number: CN202120575714.0, titled: A Vacuum Suction Truck, includes a chassis, a tank body, a front lifting device and a rear lifting device. The front lifting device is hinged to the tank body at the front of the tank body, and the rear lifting device is hinged to the tank body at the rear of the tank body. This device adjusts the inclination angle and height of the tank body by adjusting the front lifting device and the rear lifting device, so that the vacuum suction truck can not only perform conventional lifting, but also perform high lifting, so that the materials in the tank body can be quickly dumped into transfer vehicles such as muck trucks and then continue to work, without moving the vacuum suction truck to a special waste collection point, greatly improving the equipment utilization rate of the vacuum suction truck. Since the entire tank body is mainly connected by a rotating pin shaft at the tail, at this time, the tank body will have an impact vibration in the direction of the shaft rotation. This impact vibration causes too large a local stress mutation to the lifting hydraulic cylinder and the structural components of the tank body and the subframe lap joint. In the long run, it will lead to wear and damage of the hydraulic cylinder and components, affecting the service life of the vehicle and having certain potential safety hazards.

[0004] Therefore, there is an urgent need for a locking device and a sewage suction truck to solve the problem that in the prior art, due to impact vibration, too large a local stress mutation is caused to the lifting hydraulic cylinder and the structural components of the tank body and the subframe lap joint, which is likely to lead to wear or damage of the hydraulic cylinder and components. Content of the Utility Model

[0005] The purpose of the utility model is to overcome the above technical deficiencies, and propose a locking device and a sewage suction truck to solve the technical problem that in the prior art, due to impact vibration, too large a local stress mutation is caused to the lifting hydraulic cylinder and the structural components of the tank body and the subframe lap joint, which is likely to lead to wear or damage of the hydraulic cylinder and components.

[0006] To achieve the above technical purpose, the utility model adopts the following technical solutions:

[0007] In the first aspect, the utility model provides a locking device for connecting a vehicle frame and a sewage suction tank body, including:

[0008] At least one bracket, which is used for connecting the sewage suction tank body; and

[0009] At least one locking assembly, the locking assembly including a locking member and a driving member, the locking member is arranged relative to the frame and is slidably connected to the bracket, and the locking member can be engaged with the frame, the driving member has a fixed end and a movable end, the fixed end of the driving member is connected to the bracket, and the movable end is connected to the locking member, which is used to drive the locking member to engage with the frame or slide off the frame.

[0010] In some embodiments, the frame is provided with at least one locking hole, the bracket is provided with a connecting hole relative to the locking hole, the locking member includes a locking rod, one end of the locking rod is arranged relative to the connecting hole, and one end of the locking rod can pass through the connecting hole after sliding relative to the bracket and be inserted into the locking hole.

[0011] In some embodiments, the driving member includes a mounting seat and a linear driving portion, the mounting seat is connected to the bracket, the linear driving portion has a fixed end and an extension end, the fixed end of the linear driving portion is connected to the mounting seat, and the extension end is connected to the other end of the locking rod, for driving the locking rod to slide relative to the bracket.

[0012] In some embodiments, the mounting seat is in the shape of a Chinese character "匚", the opening of the mounting seat is arranged relative to the connecting hole, and the open end of the mounting seat is connected to the bracket, and a through hole is provided at the bottom of the mounting seat relative to the connecting hole, the fixed end of the linear drive part is connected to the side of the mounting seat away from the bracket, and the extended end of the linear drive part passes through the through hole and is connected to the other end of the locking member, and drives the locking rod to slide relative to the mounting seat and the bracket.

[0013] In some embodiments, the locking member also includes a first travel switch and a shift block, the first travel switch has a fixed end and a contact end, the fixed end of the first travel switch is connected to the bracket, and the contact end is arranged relative to the locking rod, the shift block is connected to the locking rod, and the shift block can abut against the contact end of the first travel switch after sliding with the locking rod.

[0014] In some embodiments, the shift block is annular and is fixedly sleeved on the locking rod.

[0015] In some embodiments, a cross-sectional area of the shift block is larger than a cross-sectional area of the communicating hole.

[0016] In some embodiments, the locking device also includes a second travel switch, the second travel switch having a fixed end and a contact end, the second travel switch is connected to the frame, the contact end is arranged relative to the bracket, and the bracket can abut against the contact end of the second travel switch after rotating relative to the frame.

[0017] In some embodiments, locking holes are respectively formed on opposite sides of the vehicle frame. There are two brackets and two locking assemblies. The two brackets are arranged oppositely and are respectively connected to two sides of the sewage suction tank body. The locking rods are arranged in one-to-one correspondence with the locking holes. The other end of the locking rod is slidably connected to the bracket, and one end of the locking rod can be slidably inserted into the locking hole.

[0018] In a second aspect, the present utility model further provides a sewage suction vehicle, including a vehicle frame, a sewage suction tank body, and the locking device as described above.

[0019] Compared with the prior art, the beneficial effects of the locking device and the sewage suction vehicle provided by the present utility model include: The bracket is used to connect the sewage suction tank body. The locking assembly includes a locking member and a driving member. The locking member is arranged relative to the vehicle frame and is slidably connected to the bracket, and the locking member can be engaged with the vehicle frame. The fixed end of the driving member is connected to the bracket, and the movable end is connected to the locking member, and is used to drive the locking member to slide close to or away from the vehicle frame and engage with it, or slide off the vehicle frame. Compared with the prior art, a locking device is further provided between the vehicle frame and the sewage suction tank body. By engaging the locking rod with the vehicle frame, the sewage suction tank body is detachably connected to the vehicle frame, enhancing the connection stability between the sewage suction tank body and the vehicle frame, thereby reducing the impact force generated by the shaking between the sewage suction tank body and the vehicle frame, reducing the excessive local stress mutation caused by the impact vibration on the lifting hydraulic cylinder and the structural components of the tank body and the sub-frame lap load-bearing, avoiding the wear or damage of the hydraulic cylinder and components, and avoiding potential safety hazards, and being able to solve the technical problem in the prior art that the excessive local stress mutation caused by the impact vibration on the lifting hydraulic cylinder and the structural components of the tank body and the sub-frame lap load-bearing is likely to cause the wear or damage of the hydraulic cylinder and components. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a three-dimensional structural schematic diagram of a locking device provided by an embodiment of the present utility model connected to a vehicle frame, a sewage suction tank body, and a hydraulic cylinder;

[0021] Figure 2 is along Figure 1 the enlarged schematic diagram at A in

[0022] Figure 3 is along Figure 1 the enlarged schematic diagram at B in

[0023] Figure 4 is another three-dimensional structural schematic diagram of a locking device provided by an embodiment of the present utility model connected to a vehicle frame, a sewage suction tank body, and a hydraulic cylinder;

[0024] Figure 5 is yet another three-dimensional structural schematic diagram of a locking device provided by an embodiment of the present utility model connected to a vehicle frame, a sewage suction tank body, and a hydraulic cylinder;

[0025] Figure 6 is along Figure 5 The enlarged schematic view at position C in

[0026] Description of the reference numerals in the drawings:

[0027] Frame 1;

[0028] Locking hole 11;

[0029] Sewage suction tank body 2;

[0030] Bracket 3;

[0031] Locking assembly 4;

[0032] Locking member 41;

[0033] Locking rod 411;

[0034] First travel switch 412;

[0035] Pusher block 413;

[0036] Driver 42;

[0037] Mounting seat 421;

[0038] Linear drive part 422;

[0039] Hydraulic cylinder 5;

[0040] Second travel switch 6. Specific embodiments

[0041] In order to make the objectives, technical solutions and advantages of the present utility model clearer, the following further details the present utility model in conjunction with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0042] In order to solve the technical problem that local stress mutation of the lifting hydraulic cylinder 5 and the structural components of the lap joint and load bearing between the tank body and the sub-frame 1 caused by impact vibration is too large, which is likely to cause wear or damage to the hydraulic cylinder 5 and the components, the present utility model provides a locking device and a sewage suction truck, which can realize the clamping connection between the locking rod 411 and the frame 1, so that the sewage suction tank body 2 is detachably connected to the frame 1, enhance the connection stability between the sewage suction tank body 2 and the frame 1, thereby reducing the impact force generated by the shaking between the sewage suction tank body 2 and the frame 1, reducing the local stress mutation of the lifting hydraulic cylinder 5 and the structural components of the lap joint and load bearing between the tank body and the sub-frame 1 caused by impact vibration, avoiding wear or damage to the hydraulic cylinder 5 and the components, and avoiding potential safety hazards.

[0043] It should be noted that the locking device and the sewage suction truck of the present utility model are used in, but not limited to, the field of automotive manufacturing technology. For the convenience of description, in the present utility model, only the case where the locking device and the sewage suction truck are applied to the field of automotive manufacturing technology is taken as an example for description. The principle of the locking device and the sewage suction truck applied to other types of equipment is substantially the same as that applied to the field of automotive manufacturing technology, and will not be elaborated here one by one.

[0044] Please refer to Figures 1 to 6 , Figures 1 to 3 which is a schematic structural diagram of the locking device and the sewage suction truck in an embodiment of the present utility model. The locking device is used to connect the vehicle frame 1 and the sewage suction tank body 2, and includes: at least one bracket 3 and at least one locking assembly 4. The bracket 3 is used to connect the sewage suction tank body 2. The locking assembly 4 includes a locking member 41 and a driving member 42. The locking member 41 is disposed opposite to the vehicle frame 1, is slidably connected to the bracket 3, and can be engaged with the vehicle frame 1. The driving member 42 has a fixed end and a movable end. The fixed end of the driving member 42 is connected to the bracket 3, and the movable end is connected to the locking member 41, and is used to drive the locking member 41 to slide close to or away from the vehicle frame 1 and engage with it, or slide off the vehicle frame 1.

[0045] In this device, the bracket 3 is used to connect the sewage suction tank body 2. The locking assembly 4 includes a locking member 41 and a driving member 42. The locking member 41 is disposed opposite to the vehicle frame 1, is slidably connected to the bracket 3, and can be engaged with the vehicle frame 1. The fixed end of the driving member 42 is connected to the bracket 3, and the movable end is connected to the locking member 41, and is used to drive the locking member 41 to slide close to or away from the vehicle frame 1 and engage with it, or slide off the vehicle frame 1.

[0046] Compared with the prior art, a locking device is further provided between the vehicle frame 1 and the sewage suction tank body 2. By engaging the locking rod 411 with the vehicle frame 1, the sewage suction tank body 2 is detachably connected to the vehicle frame 1, enhancing the connection stability between the sewage suction tank body 2 and the vehicle frame 1, thereby reducing the impact force generated by the shaking between the sewage suction tank body 2 and the vehicle frame 1, reducing the excessive local stress mutation of the lifting hydraulic cylinder 5 and the structural components of the tank body and the sub-frame 1 due to impact vibration, avoiding wear or damage of the hydraulic cylinder 5 and the components, and avoiding potential safety hazards, and being able to solve the technical problem in the prior art that the excessive local stress mutation of the lifting hydraulic cylinder 5 and the structural components of the tank body and the sub-frame 1 caused by impact vibration is likely to lead to wear or damage of the hydraulic cylinder 5 and the components.

[0047] Further, one end of the vehicle frame 1 and the sewage suction tank body 2 in this device is hinged through a hinge piece, and the other end is hinged through a hydraulic cylinder 5. The fixed end of the hydraulic cylinder 5 is hinged to the sewage suction tank body 2, and the extending end is hinged to the vehicle frame 1. By setting a control piece, driving is achieved by the electrical connection between the control piece and the hydraulic cylinder 5. Here, reference can be made to the Chinese utility model patent with the application number: CN202120575714.0, titled: A Vacuum Suction Vehicle. This is a conventional setting well-known to those skilled in the art and will not be elaborated further here.

[0048] Further, the connection structure composed of the bracket 3 and the locking assembly 4 in this device is used to cooperate with the connection structure in the prior art to improve the connection stability between the sewage suction tank body 2 and the vehicle frame 1, reduce the impact force generated by the shaking between the sewage suction tank body 2 and the vehicle frame 1, reduce the excessive local stress mutation caused by the impact vibration on the lifting hydraulic cylinder 5 and the structural components where the tank body and the sub-frame 1 are lapped and loaded, avoid wear or damage of the hydraulic cylinder 5 and its components, and avoid potential safety hazards.

[0049] In this embodiment, the locking member 41 includes a locking rod 411, a first travel switch 412, and a dial block 413, and the driving member 42 includes a mounting seat 421 and a linear driving part 422.

[0050] Among them, the vehicle frame 1 is provided with at least one locking hole 11, the bracket 3 is provided with a communication hole opposite to the locking hole 11, one end of the locking rod 411 is arranged opposite to the communication hole, and after one end of the locking rod 411 slides relative to the bracket 3, it can pass through the communication hole and be inserted into the locking hole 11.

[0051] In this device, by inserting the locking rod 411 into the locking hole 11, the limit of the rotation of the sewage suction tank body 2 relative to the vehicle frame 1 is realized, thereby reducing the impact force generated by the shaking between the sewage suction tank body 2 and the vehicle frame 1.

[0052] In one of the embodiments, please refer to Figure 2 、 Figure 3 , the mounting seat 421 is connected to the bracket 3. The linear driving part 422 has a fixed end and an extending end. The fixed end of the linear driving part 422 is connected to the mounting seat 421, and the extending end is connected to the other end of the locking rod 411, and is used to drive the locking rod 411 to slide relative to the bracket 3.

[0053] The mounting seat 421 is used to support and connect the linear driving part 422, and plays a role in connecting and supporting the sliding of the locking rod 411 relative to the bracket 3.

[0054] Specifically, the linear driving part 422 in this device is a cylinder, which can also be replaced by an electric push rod here. The cylinder and the electric push rod are both common and easy-to-purchase devices in the market. This is a conventional setting well-known to those skilled in the art and will not be elaborated further.

[0055] In one embodiment, please refer to Figure 2 , Figure 3 and Figure 6 . The mounting seat 421 is in a "C" shape. The opening of the mounting seat 421 is arranged opposite to the communication hole, and the open end of the mounting seat 421 is connected to the bracket 3. A through hole is opened at the bottom of the mounting seat 421 opposite to the communication hole. The fixed end of the linear driving part 422 is connected to the side of the mounting seat 421 away from the bracket 3, and the extending end of the linear driving part 422 passes through the through hole and is connected to the other end of the locking part 41, and drives the locking rod 411 to slide relative to the mounting seat 421 and the bracket 3.

[0056] The mounting seat 421 in a "C" shape can improve the stability of the device. At the same time, it is not only reasonable in design but also beautiful in appearance, avoiding interference with the sliding of the linear driving part 422 and the locking rod 411, and improving the practicability of the device.

[0057] In one embodiment, please refer to Figure 2 , Figure 6 . The first travel switch 412 has a fixed end and a contact end. The fixed end of the first travel switch 412 is connected to the bracket 3, and the contact end is arranged opposite to the locking rod 411. The dial block 413 is connected to the locking rod 411, and after the dial block 413 slides with the locking rod 411, it can abut against the contact end of the first travel switch 412.

[0058] The cooperation structure of the dial block 413 and the first travel switch 412 is set so that after the locking rod 411 slides away from the locking hole 11, the dial block 413 can trigger the first travel switch 412. The first travel switch 412 is electrically connected to the control part. When the dial block 413 triggers the first travel switch 412, an electrical signal is transmitted to the control part, and the control part controls the extending end of the hydraulic cylinder 5 to extend relative to the fixed end, realizing the dumping of the sewage suction tank body 2.

[0059] Furthermore, both the control part and the first travel switch 412 here are common and easily purchasable devices in the market. This belongs to the conventional settings well-known to those skilled in the art and will not be elaborated too much here.

[0060] As one implementation method, as shown in Figure 6 , the dial block 413 is in a ring shape and is fixedly sleeved on the locking rod 411.

[0061] By setting the dial block 413 in a ring shape, the contact area between the dial block 413 and the contact end of the first travel switch 412 is increased, and the stability of the device operation is increased.

[0062] As another implementation method, the cross-sectional area of the dial block 413 is larger than the cross-sectional area of the communication hole.

[0063] The stroke of the locking rod 411 is limited by setting a shifting block 413 with a cross-sectional area larger than that of the communication hole, thereby improving the stability of the device.

[0064] In this embodiment, the device further includes a second travel switch 6. The second travel switch 6 has a fixed end and a contact end. The second travel switch 6 is connected to the vehicle frame 1, the contact end is arranged opposite to the bracket 3, and after the bracket 3 rotates relative to the vehicle frame 1, it can abut against the contact end of the second travel switch 6.

[0065] A matching structure of the bracket 3 and the second travel switch 6 is set, so that when the bracket 3 rotates and resets with the sewage suction tank body 2, the bracket 3 can trigger the second travel switch 6. Among them, the second travel switch 6 is electrically connected to the control member. When the bracket 3 triggers the second travel switch 6, at this time, the communication hole on the bracket 3 is opposite to the locking hole 11 on the vehicle frame 1, and the electrical signal is transmitted to the control member. The control member controls the extension end of the linear drive part 422 to extend relative to the fixed end, so that the locking rod 411 is inserted into the locking hole 11, and the sewage suction tank body 2 is locked on the vehicle frame 1.

[0066] Furthermore, in this device, the bracket 3 is in a plate shape, and the second travel switches 6 are all common and easily purchasable devices in the market. This belongs to the conventional settings well-known to those skilled in the art and will not be elaborated too much here.

[0067] In this embodiment, locking holes 11 are respectively opened on the opposite sides of the vehicle frame 1. The number of brackets 3 and the locking assemblies 4 is two. The two brackets 3 are arranged opposite to each other and are respectively connected to both sides of the sewage suction tank body 2. The locking rods 411 are arranged in one-to-one correspondence with the locking holes 11. The other end of the locking rod 411 is slidably connected to the bracket 3, and one end can be slidably inserted into the locking hole 11.

[0068] By arranging the locking rods 411 and the locking holes 11 on both sides of the sewage suction tank body 2, the stability after the device is locked and connected is improved.

[0069] The present utility model also provides a sewage suction truck, which includes a vehicle frame 1, a sewage suction tank body 2 and a locking device.

[0070] For a better understanding of the present utility model, the following combines Figures 1 to 6 to elaborate on the technical solution of the present utility model in detail:

[0071] The specific working process of the present utility model is as follows. The bracket 3 is used to connect the sewage suction tank body 2. The locking assembly 4 includes a locking member 41 and a driving member 42. The locking member 41 is arranged relative to the vehicle frame 1 and is slidably connected to the bracket 3, and the locking member 41 can be engaged with the vehicle frame 1. The fixed end of the driving member 42 is connected to the bracket 3 and the movable end is connected to the locking member 41, and is used to drive the locking member 41 to slide close to or away from the vehicle frame 1 and engage with or slide off the vehicle frame 1. Compared with the prior art, a locking device is also provided between the vehicle frame 1 and the sewage suction tank body 2. By engaging the locking rod 411 with the vehicle frame 1, the sewage suction tank body 2 is detachably connected to the vehicle frame 1, enhancing the connection stability between the sewage suction tank body 2 and the vehicle frame 1, thereby reducing the impact force generated by the shaking between the sewage suction tank body 2 and the vehicle frame 1, reducing the excessive local stress mutation caused by the impact vibration to the lifting hydraulic cylinder 5 and the structural components of the lap bearing between the tank body and the sub-frame 1, avoiding the wear or damage of the hydraulic cylinder 5 and the components, and avoiding potential safety hazards.

[0072] When in use, when it is necessary to dump the sewage suction tank body 2, turn the tank lifting knob on the sewage suction vehicle panel to the "lift" position. At this time, the electrical signal of the control member is transmitted to the linear driving part 422. The electromagnetic reversing valve of the linear driving part 422 receives the signal and retracts the locking rod 411 from the locking hole 11 of the vehicle frame 1. When the locking rod 411 retracts with the dial block 413 and touches the contact end of the first travel switch 412, at this time, the circuit of the first travel switch 412 is turned on and controls the hydraulic reversing valve of the oil cylinder to switch the oil circuit to supply oil to the hydraulic rod. At this time, the oil cylinder starts to lift, which is the state shown in the figure.

[0073] Further, when the sewage suction tank body 2 needs to be lowered to the reset position, turn the tank lifting knob on the sewage suction vehicle panel to the "lower" position. When the sewage suction tank body 2 and the bracket 3 completely fall on the vehicle frame 1, the bracket 3 abuts against the first travel switch 412 of the second travel switch 6. At this time, the travel switch is powered on, the hydraulic reversing valve is powered off and switched to the middle position, and at the same time, the electromagnetic reversing valve of the control cylinder is powered on and reversed. At this time, the extending end of the linear driving part 422 starts to extend until the locking rod 411 is completely inserted into the locking hole 11. At this time, the sewage suction tank body 2 is completely locked with the vehicle frame 1. This is the state shown in the figure.

[0074] Through the above structure, the present device can solve the technical problem in the prior art that the excessive local stress mutation caused by the impact vibration to the lifting hydraulic cylinder 5 and the structural components of the lap bearing between the tank body and the sub-frame 1 is likely to cause the wear or damage of the hydraulic cylinder 5 and the components.

[0075] The above specific embodiments of the present utility model do not constitute a limitation to the protection scope of the present utility model. Any other corresponding changes and deformations made according to the technical concept of the present utility model shall be included in the protection scope of the claims of the present utility model.

Claims

1. A locking device for connecting a vehicle frame and a sewage suction tank body, characterized in that, include: At least one bracket, the bracket being used to connect to the sewage suction tank; as well as At least one locking assembly, the locking assembly including a locking member and a driving member, the locking member is arranged relative to the frame and is slidably connected to the bracket, and the locking member can be engaged with the frame, the driving member has a fixed end and a movable end, the fixed end of the driving member is connected to the bracket, and the movable end is connected to the locking member, which is used to drive the locking member to engage with the frame or slide off the frame.

2. The locking device according to claim 1, characterized in that, The frame is provided with at least one locking hole, the bracket is provided with a connecting hole relative to the locking hole, the locking member includes a locking rod, one end of the locking rod is arranged relative to the connecting hole, and one end of the locking rod can pass through the connecting hole after sliding relative to the bracket and be inserted into the locking hole.

3. The locking device according to claim 2, characterized in that, The driving member includes a mounting seat and a linear driving part, the mounting seat is connected to the bracket, the linear driving part has a fixed end and an extended end, the fixed end of the linear driving part is connected to the mounting seat, and the extended end is connected to the other end of the locking rod, which is used to drive the locking rod to slide relative to the bracket.

4. The locking device according to claim 3, characterized in that, The mounting seat is in the shape of a Chinese character "匚", the opening of the mounting seat is arranged opposite to the communicating hole, and the open end of the mounting seat is connected to the bracket. A through hole is provided at the bottom of the mounting seat opposite to the communicating hole, the fixed end of the linear drive part is connected to the side of the mounting seat away from the bracket, and the extended end of the linear drive part passes through the through hole and is connected to the other end of the locking member, and drives the locking rod to slide relative to the mounting seat and the bracket.

5. The locking device according to claim 4, characterized in that, The locking member also includes a first travel switch and a shift block. The first travel switch has a fixed end and a contact end. The fixed end of the first travel switch is connected to the bracket, and the contact end is arranged relative to the locking rod. The shift block is connected to the locking rod, and the shift block can abut against the contact end of the first travel switch after sliding with the locking rod.

6. The locking device according to claim 5, characterized in that, The shifting block is annular and is fixedly sleeved on the locking rod.

7. The locking device according to claim 6, characterized in that: The cross-sectional area of the shift block is larger than the cross-sectional area of the communicating hole.

8. The locking device according to claim 7, wherein It also includes a second travel switch, which has a fixed end and a contact end. The second travel switch is connected to the frame, and the contact end is arranged relative to the bracket. After the bracket rotates relative to the frame, it can abut against the contact end of the second travel switch.

9. The locking device according to claim 8, characterized in that: Locking holes are respectively provided on the opposite sides of the frame, and there are two brackets and locking assemblies. The two brackets are arranged opposite to each other and are respectively connected to the two sides of the sewage suction tank body. The locking rods are arranged in a one-to-one correspondence with the locking holes. The other end of the locking rod is slidably connected to the bracket, and one end can be slidably inserted into the locking hole.

10. A sewage suction truck, characterized in that: The vehicle comprises a frame, a sewage suction tank and a locking device according to any one of claims 1 to 9.

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