Tank car manhole cover device

Abstract

The utility model provides a tank car manhole cover device, relates to the technical field of transport vehicles, and solves the technical problem that a manhole cover needs to be opened and closed manually in the prior art. The device comprises a driving mechanism, a manhole cover, a powder guiding assembly, a first transmission mechanism and a second transmission mechanism, the manhole cover is arranged on a tank body, one end of the first transmission mechanism is connected with the driving end of the driving mechanism, the other end of the first transmission mechanism is connected with the manhole cover, and the driving mechanism can drive the manhole cover to cover a manhole or be away from the manhole; a through hole identical to the manhole is formed in the middle of the powder guiding assembly, one end of the second transmission mechanism is connected with the driving end of the driving mechanism, the other end of the second transmission mechanism is connected with the powder guiding assembly, and the driving mechanism can drive the powder guiding assembly to move to the position over the manhole or away from the manhole. The manhole cover is driven to be opened and closed through the driving mechanism, and the problem of potential safety hazards caused by manual opening and closing of the manhole cover is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of transport vehicles, in particular to a manhole cover device for a tank truck. Background Art

[0002] A tank truck is a transport vehicle with a tank-shaped body, which is commonly used to transport items. A manhole is provided at the top of the tank truck, and materials can be filled through the manhole. In the current existing technology, the manhole cover is manually opened and closed, and workers need to climb to the top of the tank truck to perform the operation of opening the cover before filling and closing the cover after filling. Climbing up and down has potential safety hazards.

[0003] Secondly, after the discharging is completed, there is a lot of ash material spilled on the tank body. When cleaning, people still need to climb up to clean it manually, which has potential safety hazard problems. Moreover, there are cleaning dead corners near the manhole cover, and in many cases, it cannot be cleaned cleanly. When the vehicle drives into the road, a large amount of ash powder particles will fly all over the sky, wasting resources and polluting the environment. Content of the Utility Model

[0004] The purpose of the utility model is to provide a manhole cover device for a tank truck, which solves the technical problem that the manhole cover in the prior art needs to be manually opened and closed. The preferred technical solutions provided by the utility model can produce many technical effects as described below.

[0005] To achieve the above purpose, the utility model provides the following technical solutions:

[0006] The manhole cover device for a tank truck provided by the utility model includes a driving mechanism, a manhole cover, a powder guiding component, a first transmission mechanism and a second transmission mechanism. The manhole cover is arranged on the tank body. One end of the first transmission mechanism is connected with the driving end of the driving mechanism, and the other end is connected with the manhole cover. The driving mechanism can drive the manhole cover to cover the manhole or move away from the manhole. The middle part of the powder guiding component has a through hole identical to the manhole. One end of the second transmission mechanism is connected with the driving end of the driving mechanism, and the other end is connected with the powder guiding component. The driving mechanism can drive the powder guiding component to move directly above the manhole or move away from the manhole.

[0007] Preferably, the powder guiding component includes an annular shaft group and a receiving body. The annular shaft group is composed of a plurality of universal joints connected end to end in sequence. The receiving body is an annular body with the through hole inside. The receiving body is connected with the annular shaft group. The annular shaft group is connected with the driving mechanism through a third transmission mechanism. The driving mechanism can drive the receiving body to switch between a flat state and a funnel state.

[0008] Preferably, the manhole cover is hinged to the tank body through the hinged frame, and the hinged frame has two connecting rods arranged parallel to each other, one end of the connecting rod is hinged to the connecting seat through a first hinge shaft, and the connecting rod is fixedly connected to the first hinge shaft, and the other end of the connecting rod is hinged with a second hinge shaft, and the manhole cover is fixedly connected to the second hinge shaft, and the first hinge shaft and the second hinge shaft are connected through a fourth transmission mechanism, and the first hinge shaft is connected to the first transmission mechanism.

[0009] Preferably, the first transmission mechanism includes a first transmission rod, a first transmission gear and a second transmission gear, one end of the first transmission rod is connected to the driving rod of the driving mechanism, and the other end has a rack portion, the rack portion is engaged with the first tooth portion of the first transmission gear, and the second tooth portion on the first transmission gear is engaged with the second transmission gear arranged on the first hinge shaft.

[0010] Preferably, a third transmission gear is fixedly provided on the second hinge shaft, and a fourth transmission gear and a fifth transmission gear are respectively provided on the outer wall and the inner wall of the manhole cover, and the fourth transmission gear and the fifth transmission gear are both fixedly connected to the connecting shaft passing through the manhole cover, and the third transmission gear and the fourth transmission gear are connected by a first rack transmission, and a second rack is slidably provided on the inner wall of the manhole cover, and the second rack is meshed with the fifth transmission gear, and the second rack has a locking rod at the end away from the fifth transmission gear, and the locking rod can be locked on the tank body.

[0011] Preferably, the second transmission mechanism includes a sixth transmission gear, a third rack and a fourth rack, the third rack is fixedly arranged on the tank body, the fourth rack is slidably arranged on the tank body, the third rack and the fourth rack are arranged parallel to each other and are both engaged with the sixth transmission gear, the sixth transmission gear is arranged on the driving rod of the driving mechanism, and the powder guide assembly is connected to the fourth rack.

[0012] Preferably, the driving mechanism is a linear driving mechanism, and a strip hole is provided at one end of the driving rod of the driving mechanism away from the fixed end, and the sixth transmission gear is slidably provided in the strip hole. The third transmission mechanism includes a transmission shaft, a seventh transmission gear and an eighth transmission gear, and the seventh transmission gear and the eighth transmission gear are respectively provided at both ends of the transmission shaft. A fifth rack is provided on the driving rod, and the fifth rack is meshed with the seventh transmission gear. A ninth transmission gear is provided on the annular shaft group, and the eighth transmission gear and the ninth transmission gear are connected in transmission.

[0013] Preferably, the driving mechanism is a cylinder.

[0014] The present application adopts the above technical solutions and has at least the following beneficial effects:

[0015] The manhole cover device of the tanker includes a driving mechanism, a manhole cover, a powder guiding component, a first transmission mechanism and a second transmission mechanism. The manhole cover is arranged on the tank body. One end of the first transmission mechanism is connected to the driving end of the driving mechanism, and the other end is connected to the manhole cover. The driving mechanism can drive the manhole cover to cover or move away from the manhole. In this way, the closing and opening of the manhole can be realized. By driving the opening and closing of the manhole cover through the driving mechanism, the potential safety hazard problem caused by workers climbing up and down to manually open and close the manhole cover can be fundamentally solved. The middle part of the powder guiding component has a through hole identical to that of the manhole. One end of the second transmission mechanism is connected to the driving end of the driving mechanism, and the other end is connected to the powder guiding component. The driving mechanism can drive the powder guiding component to move directly above the manhole or away from the manhole. In this way, the powder guiding component can be placed on the manhole, and the powder can be guided to flow into the tank body through the powder guiding component during the loading process, avoiding the powder from falling around the manhole cover during discharging, so that manual cleaning is no longer required, and thus the problems of potential safety hazards and incomplete cleaning in manual cleaning are avoided.

[0016] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0018] Figure 1 is a schematic structural diagram of the manhole cover device of the tanker provided by the embodiment of the present invention;

[0019] Figure 2 is a schematic connection structure diagram of the powder guiding component and the driving mechanism provided by the embodiment of the present invention;

[0020] Figure 3 is a partial structural diagram of the manhole cover provided by the embodiment of the present invention;

[0021] Figure 4 is a schematic structural diagram of the first locking method of the manhole cover provided by the embodiment of the present invention;

[0022] Figure 5 is a schematic structural diagram of the second locking method of the manhole cover provided by the embodiment of the present invention;

[0023] Figure 6 It is a schematic diagram of the internal structure of the manhole cover provided by the embodiment of the present utility model.

[0024] In the figure, 1 is the driving mechanism; 2 is the manhole cover; 3 is the powder guiding assembly; 301 is the annular shaft group; 302 is the receiving body; 4 is the first transmission mechanism; 401 is the first transmission rod; 402 is the first transmission gear; 403 is the second transmission gear; 5 is the second transmission mechanism; 501 is the sixth transmission gear; 502 is the third rack; 503 is the fourth rack; 6 is the through hole; 7 is the third transmission mechanism; 701 is the transmission shaft; 702 is the seventh transmission gear; 703 is the eighth transmission gear; 8 is the hinge frame; 801 is the connecting rod; 802 is the first hinge shaft; 803 is the connecting seat; 804 is the second hinge shaft; 9 is the fourth transmission mechanism; 10 is the driving rod; 11 is the third transmission gear; 12 is the fourth transmission gear; 13 is the fifth transmission gear; 14 is the first rack; 15 is the second rack; 16 is the strip hole; 17 is the fifth rack; 18 is the ninth transmission gear. Specific embodiments

[0025] In order to make the purpose, technical solutions and advantages of the present utility model clearer, the technical solutions of the present utility model will be described in detail below. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments in the present utility model, all other implementation manners obtained by those of ordinary skill in the art without creative efforts shall fall within the scope protected by the present utility model.

[0026] The specific embodiment of the present utility model provides a manhole cover device for a tank truck. As shown in the accompanying Figure 1 figures, it mainly includes a driving mechanism 1, a manhole cover 2, a powder guiding assembly 3, a first transmission mechanism 4 and a second transmission mechanism 5.

[0027] Among them, the manhole cover 2 is arranged on the tank body. The manhole cover 2 closes the manhole under normal conditions and opens the manhole when filling powder.

[0028] One end of the first transmission mechanism 4 is connected to the driving end of the driving mechanism 1, and the other end is connected to the manhole cover 2. The driving mechanism 1 can drive the manhole cover 2 to cover the manhole or move away from the manhole. The first transmission mechanism 4 is used to transmit the driving force of the driving mechanism 1 to the manhole cover 2 to realize the opening and closing of the manhole cover 2. By the way of driving the opening and closing of the manhole cover by the driving mechanism, the safety hazard problem caused by workers climbing up and down to manually open and close the manhole cover can be fundamentally solved.

[0029] The middle part of the powder guiding assembly 3 has a through hole 6 that is the same as the manhole, that is, the shape and size of the through hole 6 are the same as those of the manhole. When the powder guiding assembly 3 moves above the manhole, the through hole 6 and the manhole are aligned so that the powder is guided into the tank body. One end of the second transmission mechanism 5 is connected to the driving end of the driving mechanism 1, and the other end is connected to the powder guiding assembly 3. The driving force of the driving mechanism 1 is transmitted to the powder guiding assembly 3 through the second transmission mechanism 5, thereby driving the powder guiding assembly 3 to move. Specifically, the driving mechanism 1 can drive the powder guiding assembly 3 to move directly above the manhole or away from the manhole. In this application, by setting the powder guiding assembly 3, the guiding of the powder is realized, so as to avoid the powder from scattering near the manhole. In this way, manual cleaning is no longer required, thus avoiding potential safety hazards and environmental pollution problems caused by unclean cleaning.

[0030] In a specific embodiment of the present application, as shown in the attached Figure 1 and attached Figure 2 figures, the powder guiding assembly 3 includes an annular shaft group 301 and a receiving body 302. The annular shaft group 301 is composed of a plurality of universal joints connected end to end in sequence. In this application, the number of universal joints used is 8, and it can also be 6, 10, 11, 15, etc. Each of the universal joints connected end to end is arranged on the moving platform through a bearing seat, and the moving platform is slidably arranged between the tank bodies. The middle part of the moving platform has a through hole, and the diameter of this through hole is not less than the diameter of the manhole, ensuring that it will not affect the powder filling. The rotation of one universal joint can drive the synchronous rotation of other universal joints, so that the shape of the receiving body 302 can be changed. The receiving body 302 is an annular body with a through hole 6 inside, and this annular body can change its shape. The receiving body 302 is connected to the annular shaft group 301, and the annular shaft group 301 is connected to the driving mechanism 1 through the third transmission mechanism 7. The action of the driving mechanism 1 can drive the annular shaft group 301 to move, and then drive the receiving body 302 to deform. The driving mechanism 1 can drive the receiving body 302 to switch between a flat state and a funnel state, as shown in the attached Figure 1As shown, the shape of the receiving body 302 is in a flat state. In this state, the entire receiving body 302 is planar. When one of the universal joints in the annular shaft group 301 rotates under the drive of the drive mechanism, it will cause the other universal joints to rotate simultaneously, thereby driving the receiving body 302 to move. In this application, the receiving body 302 can be connected to each universal joint through a rod, and the extension lines of all the rods pass through the center point of the receiving body 302, so as to ensure the rotation of the annular shaft group 301 and drive the change in the shape of the receiving body 302; the receiving body 302 is a foldable plate structure or an elastic cloth-like structure, and it can be other foldable plate structures with folding marks set, such as setting a crease between two adjacent rods used for connection. In this way, when multiple rods swing upward simultaneously, the crease bends, realizing the change of the receiving body 302 from a flat state to a funnel state. The funnel state of the receiving body 302 effectively guides the powder material, thus avoiding the powder material from scattering to the peripheral position of the manhole during filling.

[0031] It should be noted that the shape of the powder guiding component 3 in this application can be in a flat state and a funnel state. Correspondingly, the position loading of the powder guiding component 3 can be the feeding state above the manhole and the normal state when it is far from the manhole. When the powder guiding component 3 is in a flat state, it can be in the feeding state above the manhole. Correspondingly, when the powder guiding component 3 is in a funnel state, it is in the normal state when it is far from the manhole. In this case, the flat state can also receive the powder scattered during filling, and before translation after filling is completed, the powder guiding component 3 becomes a funnel state to guide the powder therein into the tank body; when the powder guiding component 3 is in a funnel state, it can be in the feeding state above the manhole. Correspondingly, when the powder guiding component 3 is in a flat state, it is in the normal state when it is far from the manhole. In this case, the funnel state can complete the guiding function, and after translation, it deforms into a flat state, which can also reduce the vehicle body height.

[0032] The manhole cover 2 of this application is hinged to the tank body through the hinge frame 8, combined with the attached Figure 1 and the attached Figure 3The articulated frame 8 has two connecting rods 801 arranged parallel to each other, one end of the connecting rod 801 is hinged on the connecting seat 803 through a first hinge shaft 802, and the connecting rod 801 is fixedly connected to the first hinge shaft 802, so that the rotation of the first hinge shaft 802 can drive the connecting rod 801 to swing, and the other end of the connecting rod 801 is hinged with a second hinge shaft 804, and the second hinge shaft 804 is fixedly connected to the manhole cover 2. The fixed connection between the manhole cover 2 and the second hinge shaft 804 can ensure that the manhole cover 2 can rotate relative to the connecting rod 801, and the first hinge shaft 802 and the second hinge shaft 804 are connected by a fourth transmission mechanism 9. The first hinge shaft 802 is connected to the first transmission mechanism 4. The fourth transmission mechanism 9 can be a gear chain mechanism or a belt pulley mechanism, and the gear or pulley is fixedly set on the second hinge shaft 804 and the connecting seat 803, wherein it is necessary to ensure that the gear or pulley on the connecting seat 803 is coaxial with the first hinge shaft 802. At this time, the first transmission mechanism 4 drives the first hinge shaft 802 to rotate, and at this time the connecting rod 801 swings upward. Under the action of the chain or belt and the gear or pulley on the connecting seat 803 is fixed, it can drive the gear or pulley of the second hinge shaft 804 to rotate, and then drive the manhole cover 2 on the second hinge shaft 804 to swing downward, ensuring that the manhole cover 2 remains in a horizontal state and descends to open and close the cover.

[0033] In this application, the driving mechanism 1 can drive the manhole cover 2 alone, and can be directly connected to the driving motor at the first hinge shaft 802 for driving. It is also possible to use a driving mechanism 1 to drive the manhole cover 2 and the powder guide assembly 3 at the same time. Figure 1 The first transmission mechanism 4 in the present application may include a first transmission rod 401, a first transmission gear 402 and a second transmission gear 403. One end of the first transmission rod 401 is connected to the driving rod 10 of the driving mechanism 1. Specifically, one end of the first transmission rod 401 is connected to the driving rod 10 by a hinged manner, so that when the driving rod 10 is extended or retracted, it can drive the first transmission rod 401 to move. The other end of the first transmission rod 401 has a rack portion, which meshes with the first tooth portion of the first transmission gear 402. The second tooth portion on the first transmission gear 402 meshes with the second transmission gear 403 provided on the first hinge shaft 802. The second transmission gear 403 is connected to the first hinge shaft 802, so that the articulated frame 8 can be driven.

[0034] Specifically, the first transmission gear 402 in the present application is rotatably arranged on the tank body or the mounting frame of the tank body. The first transmission gear 402 has a first tooth portion that meshes with the rack portion. The first tooth portion can be a spur gear. The first transmission gear 402 also has a second tooth portion that is coaxial with the first tooth portion. The second tooth portion and the second transmission gear 403 transmit force. Since the driving mechanism 1 in the present application drives the manhole cover 2 and the powder guide assembly 3 at the same time, as shown in the attached figure, Figure 1 As shown in , the driving mechanism 1 in the present application can be a cylinder, and the air source of the cylinder can be the air source on the tank truck. Of course, a hydraulic cylinder or a linear motor can be used to realize a linear drive device. A pushing mechanism (not shown in the figure) can also be set on the side of the first transmission rod 401 away from the first transmission gear 402 to ensure the meshing effect of the first transmission rod 401 and the first transmission gear 402, thereby ensuring the transmission effect. This pushing mechanism can be a pushing wheel slidably set on the tank body, the pushing wheel is pressed against the first transmission rod 401, and a spring is set between the pushing wheel and the tank body to lift the pushing force and ensure that the driving mechanism 1 can be pressed against the first transmission rod 401 during the extension or contraction process due to the tilt of the first transmission rod 401 and the horizontal displacement.

[0035] In some embodiments, a third transmission gear 11 is fixedly provided on the second hinge shaft 804, and the rotation of the second hinge shaft 804 can drive the rotation of the third transmission gear 11. A fourth transmission gear 12 and a fifth transmission gear 13 are respectively provided on the outer wall and the inner wall of the manhole cover 2. The fourth transmission gear 12 and the fifth transmission gear 13 are both fixedly connected to the connecting shaft passing through the manhole cover 2. The third transmission gear 11 and the fourth transmission gear 12 are connected by a first rack 14, and the first rack 14 can be slidably provided on the manhole cover 2. The rotation of the third transmission gear 11 can drive the rotation of the fourth transmission gear 12, and the rotation of the fourth transmission gear 12 drives the rotation of the fifth transmission gear 13. A second rack 15 is slidingly provided on the inner wall of the manhole cover 2. The second rack 15 is engaged with the fifth transmission gear 13. The rotation of the fifth transmission gear 13 can drive the translation of the second rack 15. The end of the second rack 15 away from the fifth transmission gear 13 has a locking rod, which can be locked on the tank body. The locking action of the locking rod can ensure that the manhole cover 2 can be tightly closed on the tank body.

[0036] It should be noted that the manhole cover 2 in the present application is kept in a horizontal state when opening and closing the cover, and the transmission mechanism used by the moving mechanism of the manhole cover 2 and the translation mechanism of the lock rod is basically a set, so the translation of the manhole cover 2 and the movement of the lock rod are carried out simultaneously. Figure 4As shown, there is a certain space between the second rack 15 and the tank body, ensuring that the second rack 15 and the tank body will not come into contact when the manhole cover 2 starts to translate. When it moves until the second rack 15 is close to the tank body, at this time, the second rack 15 has telescoped to the inner side of the manhole cover 2 and will not abut against the tank body either.

[0037] In another embodiment of the present application, the locking rod of the second rack 15 is designed as an inclined surface. Similarly, the side wall of the tank body is also designed as an inclined surface, so that the translation of the manhole cover 2 can be ensured while the second rack 15 can smoothly move away from the tank body during translation.

[0038] In some embodiments, the second transmission mechanism 5 includes a sixth transmission gear 501, a third rack 502 and a fourth rack 503. The third rack 502 is fixedly arranged on the tank body, and the fourth rack 503 is slidably arranged on the tank body. The third rack 502 and the fourth rack 503 are arranged in parallel and both mesh with the sixth transmission gear 501. In this way, the sixth transmission gear 501 can move between the third rack 502 and the fourth rack 503. The sixth transmission gear 501 is arranged on the driving rod 10 of the driving mechanism 1. The powder guiding assembly 3 is connected to the fourth rack 503. The driving mechanism 1 drives the translation of the sixth transmission gear 501. Combined with the attached Figure 1 Or the attached Figure 2 , if the driving mechanism 1 drives the sixth transmission gear 501 to translate to the right, because the third rack 502 is fixedly arranged, the sixth transmission gear 501 will rotate counterclockwise to ensure meshing movement on the third rack 502. At the same time, the sixth transmission gear 501 can drive the fourth rack 503 to move to the right, and the powder guiding assembly 3 can be connected to the fourth rack 503, so that the translation of the powder guiding assembly 3 can be realized. The powder guiding assembly 3 is slidably connected to the tank body.

[0039] In some embodiments, the driving mechanism 1 is a linear driving mechanism. A strip-shaped hole 16 is provided at one end of the driving rod 10 of the driving mechanism 1 away from the fixed end. The sixth transmission gear 501 is slidably arranged in the strip-shaped hole 16. This setting method can ensure that when the driving mechanism 1 is driving, there are some parts that will not directly drive the fourth rack 503; The third transmission mechanism 7 includes a transmission shaft 701, a seventh transmission gear 702 and an eighth transmission gear 703. The transmission shaft 701 is rotatably arranged on the mounting seat provided on the powder guiding assembly 3 and slidably connected to the tank body. The seventh transmission gear 702 and the eighth transmission gear 703 are respectively arranged at both ends of the transmission shaft 701. A fifth rack 17 is arranged on the driving rod 10. Specifically, this fifth rack 17 can be arranged at one end of the driving rod 10 away from the driving mechanism 1. The fifth rack 17 meshes with the seventh transmission gear 702. The translation of the driving rod 10 drives the seventh transmission gear 702 to indirectly drive the rotation of the transmission shaft 701 and the eighth transmission gear 703. A ninth transmission gear 18 is arranged on the annular shaft group 301. The eighth transmission gear 703 and the ninth transmission gear 18 are in transmission connection. Through the transmission connection between the eighth transmission gear 703 and the ninth transmission gear 18, the rotation of one universal joint can be driven, and then the powder guiding assembly 3 can be deformed. In this way, in this application, by setting a strip-shaped hole 16 at one end of the driving rod 10, the prior deformation of the powder guiding assembly 3 can be driven.

[0040] In the present utility model, the terms "one embodiment", "some embodiments", "example", "specific example", "some examples", etc. mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present 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 can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0041] The above is only the specific implementation manner of the present utility model, but the protection scope of the present utility model is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present utility model can easily think of changes or substitutions, which should all be covered within the protection scope of the present utility model. Therefore, the protection scope of the present utility model should be subject to the protection scope of the claims.

Claims

1. A manhole cover device for a tanker truck, characterized in that, It includes a driving mechanism, a manhole cover, a powder guide assembly, a first transmission mechanism and a second transmission mechanism. The manhole cover is arranged on the tank body. One end of the first transmission mechanism is connected to the driving end of the driving mechanism, and the other end is connected to the manhole cover. The driving mechanism can drive the manhole cover to be set on the manhole or away from the manhole. The middle part of the powder guide assembly has a through hole that is the same as the manhole. One end of the second transmission mechanism is connected to the driving end of the driving mechanism, and the other end is connected to the powder guide assembly. The driving mechanism can drive the powder guide assembly to move directly above the manhole or away from the manhole.

2. The manhole cover device for a tanker truck according to claim 1, characterized in that, The powder guide assembly includes an annular shaft group and a receiving body. The annular shaft group is composed of multiple universal joints connected end to end in sequence. The receiving body is an annular body with the through hole inside. The receiving body is connected to the annular shaft group. The annular shaft group is connected to the driving mechanism through a third transmission mechanism. The driving mechanism can drive the receiving body to switch between a flat state and a funnel state.

3. The manhole cover device for a tanker truck according to claim 1 or 2, characterized in that, The manhole cover is hinged to the tank body through a hinge frame, and the hinge frame has two connecting rods arranged parallel to each other. One end of the connecting rod is hinged to the connecting seat through a first hinge shaft, and the connecting rod is fixedly connected to the first hinge shaft. The other end of the connecting rod is hinged with a second hinge shaft, and the manhole cover is fixedly connected to the second hinge shaft. The first hinge shaft and the second hinge shaft are connected through a fourth transmission mechanism, and the first hinge shaft is connected to the first transmission mechanism.

4. The manhole cover device for a tanker truck according to claim 3, characterized in that, The first transmission mechanism includes a first transmission rod, a first transmission gear and a second transmission gear. One end of the first transmission rod is connected to the driving rod of the driving mechanism, and the other end has a rack portion. The rack portion is engaged with the first tooth portion of the first transmission gear. The second tooth portion on the first transmission gear is engaged with the second transmission gear provided on the first hinge shaft, and the second transmission gear is connected to the first hinge shaft.

5. The manhole cover device for a tanker truck according to claim 3, characterized in that, A third transmission gear is fixedly provided on the second hinge shaft, and a fourth transmission gear and a fifth transmission gear are respectively provided on the outer wall and the inner wall of the manhole cover. The fourth transmission gear and the fifth transmission gear are both fixedly connected to the connecting shaft that passes through the manhole cover. The third transmission gear and the fourth transmission gear are connected by a first rack transmission. A second rack is slidably provided on the inner wall of the manhole cover, and the second rack is engaged with the fifth transmission gear. A locking rod is provided at an end of the second rack away from the fifth transmission gear, and the locking rod can be locked on the tank body.

6. The manhole cover device for a tank truck according to claim 2, characterized in that, The second transmission mechanism includes a sixth transmission gear, a third rack and a fourth rack. The third rack is fixedly arranged on the tank body, and the fourth rack is slidably arranged on the tank body. The third rack and the fourth rack are arranged parallel to each other and are both engaged with the sixth transmission gear. The sixth transmission gear is arranged on the driving rod of the driving mechanism, and the powder guide assembly is connected to the fourth rack.

7. The manhole cover device for a tanker truck according to claim 6, characterized in that, The driving mechanism is a linear driving mechanism. A strip-shaped hole is provided at one end of the driving rod of the driving mechanism away from the fixed end. The sixth transmission gear is slidably arranged in the strip-shaped hole. The third transmission mechanism includes a transmission shaft, a seventh transmission gear and an eighth transmission gear. The seventh transmission gear and the eighth transmission gear are respectively arranged at both ends of the transmission shaft. A fifth rack is arranged on the driving rod. The fifth rack meshes with the seventh transmission gear. A ninth transmission gear is arranged on the annular shaft group. The eighth transmission gear and the ninth transmission gear are in transmission connection.

8. The manhole cover device for a tanker truck according to claim 1, characterized in that, The driving mechanism is a cylinder.

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