A sealing device and a concrete mixer truck

Abstract

The application provides a sealing device and a concrete mixer truck, and relates to the technical field of engineering machinery. The sealing device comprises a sealing cover, rollers and an adjusting structure. The rollers are arranged on the same side of the sealing cover, and the outer contours of the rollers are used for flange connection with a mixing drum. The adjusting structure is connected with the sealing cover and the rollers in the axial direction of the rollers. When the rollers are connected with the flange of the mixing drum, the adjusting structure is used for applying a pre-tightening force to the sealing cover in the axial direction of the rollers, so that the sealing cover is sealingly connected with a material port of the mixing drum through the pre-tightening force. In this way, the rollers realize the centering of the sealing cover, avoid the deviation of the coaxiality of the mixing drum and the tank cover due to the manufacturing error of the vehicle frame, and further affect the sealing. The size of the pre-tightening force applied to the sealing cover by the adjusting structure is adjusted, so that the material port sealing of the concrete mixer truck is realized, and the sealing flexibility of the sealing cover is improved.

Description

Technical Field

[0001] This invention relates to the field of engineering machinery technology, and more specifically, to a sealing device and a concrete mixer truck. Background Technology

[0002] A concrete mixer truck is a specialized vehicle widely used in engineering construction. It can transport concrete from a mixing plant to the construction site and ensure that the material inside the mixing drum rotates continuously and at a constant speed during transportation.

[0003] Currently, most concrete mixer trucks on the market are designed for ground construction. The rear of these trucks is often open, leading to frequent material leakage and environmental pollution. To prevent leakage, conventional techniques involve reducing the load capacity or increasing the truck's tilt angle, resulting in a low effective load, low efficiency, or a high center of gravity, hindering maneuverability. Furthermore, open-type concrete mixer trucks suffer from severe moisture evaporation in summer, causing a decrease in concrete slump and even rendering the concrete ineffective. On rainy days, the lack of effective sealing allows rainwater to enter the mixing drum, further degrading concrete quality. Summary of the Invention

[0004] The problem this invention addresses is: how to solve the problem of sealing the material inlet of a concrete mixer truck.

[0005] To address the aforementioned problems, the present invention provides a sealing device comprising a sealing cap, rollers, and an adjusting structure. Multiple rollers are disposed on the same side of the sealing cap, and the outer contours of the multiple rollers are designed to engage with the flange of a mixing drum. The adjusting structure is connected to the sealing cap and the rollers along the axial direction of the rollers. When the multiple rollers are engaged with the flange of the mixing drum, the adjusting structure applies a pre-tightening force to the sealing cap along the axial direction of the rollers, thereby sealing the sealing cap with the material inlet of the mixing drum through the pre-tightening force.

[0006] Optionally, the sealing cover includes a plate body and a first sealing rubber gasket. The plate body has an annular protrusion at one end facing the roller, and the first sealing rubber gasket is sleeved on the annular protrusion. When multiple rollers are engaged with the flange of the mixing drum, the first sealing rubber gasket is used to seal the connection with the material inlet of the mixing drum.

[0007] Optionally, the plate body is further provided with an annular baffle and a second sealing rubber gasket at one end facing the roller. The annular baffle is disposed on the side of the first sealing rubber gasket away from the annular protrusion, and the second sealing rubber gasket is disposed between the first sealing rubber gasket and the annular baffle. When multiple rollers are engaged with the flange of the mixing cylinder, both the first sealing rubber gasket and the second sealing rubber gasket are used to seal the connection with the material inlet of the mixing cylinder.

[0008] Optionally, an airbag is further provided between the first sealing rubber pad and the second sealing rubber pad, and the airbag abuts against the first sealing rubber pad and the second sealing rubber pad respectively.

[0009] Optionally, the plate body is provided with a mounting wall, the mounting wall extends to the side of the roller opposite to the plate body, and the adjustment structure is connected to the roller and the mounting wall respectively along the axial direction of the roller.

[0010] Optionally, the dimensions of the annular baffle and the annular protrusion in the axial direction of the first sealing rubber gasket are both smaller than the dimensions of the first sealing rubber gasket.

[0011] Optionally, the roller is provided with a conical structure, which is used to engage with the flange of the mixing cylinder via the conical structure.

[0012] Optionally, the adjustment structure includes an adjustment screw, an adjustment nut, and an adjustment sleeve. The adjustment screw passes sequentially through the plate body, the roller, and the mounting wall along the axial direction of the roller and extends out from the mounting wall. The adjustment screw is threadedly connected to the adjustment nut. The adjustment sleeve is located between the adjustment screw and the mounting wall, and its two ends along the axial direction of the adjustment screw abut against the roller and the adjustment nut, respectively.

[0013] Optionally, a copper sleeve is provided between the adjusting screw and the roller.

[0014] Compared with the prior art, the sealing device of the present invention uses multiple rollers, all located on the same side of the sealing cover, whose outer contours are engaged with the flange of the mixing drum. This ensures that the central axis of symmetry of the multiple rollers is aligned with the feed inlet axis of the mixing drum. Furthermore, the adjustment structure is connected to the sealing cover and the rollers along the axial direction of the rollers. The adjustment structure enables the connection between the multiple rollers and the sealing cover. After connection, the multiple rollers adjust the axis of the sealing cover to align with the feed inlet axis, thereby achieving centering of the sealing cover. This ensures that the sealing cover fits evenly against the feed inlet end, preventing the mixing drum and the tank cover from becoming coaxial due to manufacturing errors in the chassis. Degree deviation, which in turn affects the seal, is addressed by adjusting the structure to apply a pre-tightening force to the sealing cover along the axial direction of the rollers when multiple rollers are engaged with the flange of the mixing drum. The sealing cover is then sealed to the material inlet of the mixing drum through this pre-tightening force. In this way, during sealing, the sealing cover can continuously seal the material inlet of the mixing drum under the action of the pre-tightening force of the adjusting structure. The sealing performance can be adjusted by adjusting the magnitude of the pre-tightening force applied to the sealing cover by the adjusting structure, thereby improving the adaptability of the sealing cover to the material inlet sealing of the mixing drum. This not only achieves the sealing of the material inlet of the concrete mixer truck but also improves the sealing flexibility of the sealing cover.

[0015] On the other hand, the present invention also provides a concrete mixer truck, including the sealing device described above.

[0016] The concrete mixer truck has all the beneficial effects of the sealing device, which will not be elaborated here. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the sealing device in an embodiment of the present invention;

[0018] Figure 2 This is an illustration of the sealing device during sealing in an embodiment of the present invention. Figure 1 ;

[0019] Figure 3 This is an illustration of the sealing device during sealing in an embodiment of the present invention. Figure 2 .

[0020] Explanation of reference numerals in the attached figures:

[0021] 1-Sealing cap; 11-Plate body; 111-Annular protrusion; 112-Mounting wall; 12-First sealing rubber gasket; 13-Annular baffle; 14-Second sealing rubber gasket; 15-Airbag; 2-Roller; 21-Conical structure; 3-Adjusting structure; 31-Adjusting screw; 32-Adjusting nut; 33-Adjusting sleeve; 34-Copper sleeve; 10-Stirring drum; 20-Flange. Detailed Implementation

[0022] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0023] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0024] In the description of this specification, the references to terms such as "embodiment," "one embodiment," "some implementations," "exemplary," and "one implementation," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or implementation is included in at least one embodiment or implementation of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or implementation. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or implementations.

[0025] The terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature.

[0026] In the attached figures, the Z-axis represents the vertical direction, i.e., the up-down position, and the positive direction of the Z-axis (i.e., the direction the arrow points to) indicates up, while the negative direction of the Z-axis (i.e., the direction opposite to the positive direction of the Z-axis) indicates down. In the attached figures, the X-axis represents the horizontal direction and is designated as the left-right position, and the positive direction of the X-axis (i.e., the direction the arrow points to) indicates the right side, while the negative direction of the X-axis (i.e., the direction opposite to the positive direction of the X-axis) indicates the left side. It should be noted that the aforementioned representations of the Z-axis and X-axis are only for the convenience of describing the present invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the present invention.

[0027] Combination Figures 1 to 3 As shown, this embodiment of the invention provides a sealing device, including a sealing cover 1, rollers 2, and an adjusting structure 3. Multiple rollers 2 are all disposed on the same side of the sealing cover 1, and the outer contours of the multiple rollers 2 are all used to engage with the flange 20 of the mixing drum 10. The adjusting structure 3 is connected to the sealing cover 1 and the rollers 2 along the axial direction of the rollers 2. When multiple rollers 2 are engaged with the flange 20 of the mixing drum 10, the adjusting structure 3 is used to apply a pre-tightening force to the sealing cover 1 along the axial direction of the rollers 2 so that the sealing cover 1 is sealed to the material inlet of the mixing drum 10 by the pre-tightening force.

[0028] Specifically, with the X-axis as the axial direction of the sealing cover 1 (which can also be understood as the left-right direction of the sealing cover 1) and the Z-axis as the radial direction of the sealing cover 1 (which can also be understood as the up-down direction of the sealing cover 1), multiple rollers 2 are provided. These multiple rollers 2 are distributed at intervals along the circumference of the sealing cover 1. Taking the left end of the sealing cover 1 facing the stirring cylinder 10 as an example, all multiple rollers 2 are located on the left side of the sealing cover 1 and are correspondingly arranged with the adjustment structure 3, that is, one adjustment structure 3 corresponds to one roller 2. Both the rollers 2 and the sealing cover 1 are provided with coaxial through holes. The adjustment structure 3 passes through the sealing cover 1 and the rollers 2 sequentially through these through holes along the axial direction of the rollers 2 (along the positive X-axis). During sealing, taking the sealing cover 1 as an example, three equally spaced rollers 2 are provided. After the outer contour of one of the three rollers 2 is engaged with the outer contour of the flange 20 on the mixing drum 10, the sealing cover 1 and the roller 2 can be connected sequentially through the adjustment structure 3 corresponding to that roller 2. The installation method of the remaining two rollers 2 is the same. After all three rollers 2 are installed, the three equally spaced rollers 2 are centrally symmetrically distributed along the circumference of the material inlet on the outer contour of the flange 20. Since the axis of the flange 20 is consistent with the axis of the material inlet, the three rollers 2 are centrally symmetrically distributed along the circumference of the material inlet. The axis of symmetry is aligned with the feed inlet axis of the mixing drum 10, and the three rollers 2 are distributed circumferentially around the sealing cover 1, so that the axis of the sealing cover 1 is aligned with the feed inlet axis of the mixing drum 10, and the left end of the sealing cover 1 is in contact with the feed inlet end of the mixing drum 10. Then, the adjusting structure 3 applies a pre-tightening force to the sealing cover 1 along the axial direction of the rollers 2. Under the action of this pre-tightening force, the three rollers 2 move closer to the sealing cover 1, and the three rollers 2 engage with the flange 20, so that the sealing cover 1 is tightly fitted onto the sealing cover 1, thereby sealing the feed inlet of the mixing drum 10. The number of rollers 2 can be adjusted according to actual needs. During sealing, the installation sequence of roller 2 and sealing cover 1 on the mixing drum 10 can be adjusted. First, sealing cover 1 is fitted against the material inlet end of the mixing drum 10. Then, adjusting structure 3 passes through sealing cover 1 and connects to the corresponding roller 2. When multiple corresponding adjusting structures 3 and roller 2 are connected, the axis of sealing cover 1 can be aligned with the axis of the material inlet, allowing the left end of sealing cover 1 to be evenly fitted against the end of the material inlet. Then, adjusting structure 3 applies a pre-tightening force to sealing cover 1 along the axial direction of roller 2, sealing cover 1 with the material inlet of the mixing drum 10 through this pre-tightening force. The adjusting structure 3 will be described in detail later.

[0029] Thus, by having the outer contours of multiple rollers 2, all located on the same side of the sealing cover 1, engage with the flange 20 of the mixing drum 10, the central symmetry axis of the multiple rollers 2 aligns with the feed inlet axis of the mixing drum 10. Furthermore, the adjusting structure 3 is connected to the sealing cover 1 and the rollers 2 along the axial direction of the rollers 2. The adjusting structure 3 enables the connection between the multiple rollers 2 and the sealing cover 1. After connection, the multiple rollers 2 adjust the axis of the sealing cover 1 to align with the feed inlet axis, thereby achieving centering of the sealing cover 1. This ensures that the sealing cover 1 fits evenly against the feed inlet end, preventing misalignment between the mixing drum and the tank cover due to frame manufacturing errors, which could affect the overall performance. To achieve a tight seal, when multiple rollers 2 are engaged with the flange 20 of the mixing drum 10, the adjusting structure 3 applies a pre-tightening force to the sealing cover 1 along the axial direction of the rollers 2. The sealing cover 1 is then sealed to the material inlet of the mixing drum 10 by this pre-tightening force. Thus, during sealing, the sealing cover 1 can continuously seal the material inlet of the mixing drum 10 under the action of the pre-tightening force of the adjusting structure 3. The sealing performance can be adjusted by adjusting the magnitude of the pre-tightening force applied to the sealing cover 1 by the adjusting structure 3, thereby improving the adaptability of the sealing cover 1 to the material inlet sealing of the mixing drum 10. This not only achieves the sealing of the material inlet of the concrete mixer truck but also improves the sealing flexibility of the sealing cover 1.

[0030] Optionally, combined Figure 1 As shown, the sealing cover 1 includes a plate body 11 and a first sealing rubber gasket 12. The plate body 11 has an annular protrusion 111 at one end facing the roller 2. The first sealing rubber gasket 12 is sleeved on the annular protrusion 111. When multiple rollers 2 are engaged with the flange 20 of the mixing drum 10, the first sealing rubber gasket 12 is used to seal the connection with the material port of the mixing drum 10.

[0031] Specifically, the annular protrusion 111 is provided at one end of the plate body 11 facing the roller 2, that is, the annular protrusion 111 is provided at the left end of the plate body 11. The first sealing rubber gasket 12 is sleeved on the annular protrusion 111. When multiple rollers 2 are engaged with the flange 20 of the mixing drum 10, the first sealing rubber gasket 12 is sealed to the material port of the mixing drum 10.

[0032] Thus, the first sealing rubber gasket 12 is set at the end of the plate body 11 facing the roller 2 and sleeved on the annular protrusion 111. The annular protrusion 111 supports and positions the first sealing rubber gasket 12. When multiple rollers 2 are engaged with the flange 20 of the mixing drum 10, the first sealing rubber gasket 12 is sealed to the material port of the mixing drum 10. In this way, after the first sealing rubber gasket 12 is deformed, the annular protrusion 111 continues to support the first sealing rubber gasket 12 to ensure the stability of the first sealing rubber gasket 12.

[0033] Optionally, combined Figure 1As shown, the plate body 11 is also provided with an annular baffle 13 and a second sealing rubber gasket 14 at one end facing the roller 2. The annular baffle 13 is located on the side of the first sealing rubber gasket 12 away from the annular protrusion 111, and the second sealing rubber gasket 14 is located between the first sealing rubber gasket 12 and the annular baffle 13. When multiple rollers 2 are engaged with the flange 20 of the mixing drum 10, the first sealing rubber gasket 12 and the second sealing rubber gasket 14 are used to seal the connection with the material inlet of the mixing drum 10.

[0034] Specifically, an annular baffle 13 and a second sealing rubber pad 14 are provided at the end of the plate body 11 facing the roller 2, that is, at the left end of the plate body 11. The annular baffle 13 is arranged radially along the first sealing rubber pad 12 on the side of the first sealing rubber pad 12 away from the annular protrusion 111, that is, the annular baffle 13 is located outside the outer contour of the first sealing rubber pad 12. The second sealing rubber pad 14 is arranged between the first sealing rubber pad 12 and the annular baffle 13, that is, the inner wall of the second sealing rubber pad 14 contacts the outer wall of the first sealing rubber pad 12, and the outer wall of the second sealing rubber pad 14 contacts the inner wall of the annular baffle 13. When multiple rollers 2 are engaged with the flange 20 of the mixing drum 10, the first sealing rubber pad 12 and the second sealing rubber pad 14 are both sealed to the material port of the mixing drum 10. When the second sealing rubber pad 14 undergoes elastic deformation, the annular baffle 13 can limit the continuous deformation of the second sealing rubber pad 14.

[0035] Thus, by setting the annular baffle 13 at one end of the plate body 11 facing the roller 2 and on the side of the first sealing rubber gasket 12 away from the annular protrusion 111, installation space is provided for the second sealing rubber gasket 14 and the first sealing rubber gasket 12. After the second sealing rubber gasket 14 is placed between the first sealing rubber gasket 12 and the annular baffle 13, the second sealing rubber gasket 14 and the first sealing rubber gasket 12 can form a secondary sealing structure between the annular baffle 13 and the annular protrusion 111. When multiple rollers 2 are engaged with the flange 20 of the mixing drum 10, the first sealing rubber gasket 12 and the second sealing rubber gasket 14 are both sealed to the material inlet of the mixing drum 10. In this way, the continuous deformation of the second sealing rubber gasket 14 and the first sealing rubber gasket 12 in their respective radial directions can be limited by the annular baffle 13 and the annular protrusion 111, respectively, so as to improve the sealing performance of the second sealing rubber gasket 14 and the first sealing rubber gasket 12.

[0036] Optionally, combined Figure 1 As shown, an airbag 15 is also provided between the first sealing rubber gasket 12 and the second sealing rubber gasket 14, and the airbag 15 abuts against the first sealing rubber gasket 12 and the second sealing rubber gasket 14 respectively.

[0037] Specifically, the inner wall of the airbag 15 abuts against the outer wall of the first sealing rubber pad 12, and the outer wall of the airbag 15 abuts against the second sealing rubber pad 14.

[0038] Thus, by placing the airbag 15 between the first sealing rubber pad 12 and the second sealing rubber pad 14, and abutting against the first sealing rubber pad 12 and the second sealing rubber pad 14 respectively, the airbag 15 can compensate for the gaps caused by uneven processing or local wear at the material inlet of the mixing drum 10, thereby improving the reliability of the seal. Furthermore, after the airbag 15 expands, it can also fill the gap between the sealing cover 1 and the mixing drum 10.

[0039] Optionally, combined Figure 1 As shown, a mounting wall 112 is provided on the plate body 11. The mounting wall 112 extends to the side of the roller 2 away from the plate body 11. The adjustment structure 3 is connected to the roller 2 and the mounting wall 112 along the axial direction of the roller 2.

[0040] Specifically, the mounting wall 112 is positioned on the plate body 11 at the location corresponding to the roller 2. Taking one of multiple rollers 2 as an example, one end of the mounting wall 112 can be integrally formed on the plate body 11, and the other end of the mounting wall 112 extends along the positive X-axis to the left side of the roller 2 and then extends a certain distance along the negative Z-axis. Here, the distance the mounting wall 112 extends along the negative Z-axis is adaptively adjusted according to actual needs. The adjustment structure 3 is connected to the roller 2 and the mounting wall 112 along the axial direction of the roller 2, respectively. The mounting wall 112 can also be extended in other ways, but this would waste material. When the mounting wall 112 is provided, during sealing, the roller 2 is placed between the mounting wall 112 and the plate body 11 along the circumference of the flange 20, and the adjustment structure 3 sequentially connects the plate body 11, the roller 2, and the mounting wall 112.

[0041] Thus, the mounting wall 112 extends to the side of the roller 2 away from the plate body 11, and the adjustment structure 3 is connected to the roller 2 and the mounting wall 112 along the axial direction of the roller 2, so that both ends of the adjustment structure 3 are supported by the mounting wall 112 and the plate body 11, respectively. After the roller 2 is connected to the adjustment structure 3, the mounting wall 112 can form a protective structure on the outside of the roller 2, thus protecting the roller 2.

[0042] Optionally, combined Figure 1 As shown, the dimensions of the annular baffle 13 and the annular protrusion 111 in the axial direction of the first sealing rubber gasket 12 are both smaller than the dimensions of the first sealing rubber gasket 12.

[0043] Specifically, the dimensions of the annular baffle 13 and the annular protrusion 111 in the axial direction of the first sealing rubber pad 12 are smaller than the dimensions of the first sealing rubber pad 12. This can be understood as the lengths of the annular baffle 13 and the annular protrusion 111 in the positive X-axis direction being smaller than the lengths of the first sealing rubber pad 12 in the positive X-axis direction.

[0044] Thus, since the dimensions of the annular baffle 13 and the annular protrusion 111 in the axial direction of the first sealing rubber gasket 12 are both smaller than the dimensions of the first sealing rubber gasket 12, a certain distance is left between the annular baffle 13 and the annular protrusion 111 and the material inlet of the mixing drum 10. In this way, when the sealing connection between the first sealing rubber gasket 12 and the material inlet wall of the mixing drum 10 undergoes elastic deformation, the excessively large dimensions of the annular baffle 13 and the annular protrusion 111 in the axial direction of the first sealing rubber gasket 12 can be avoided from affecting the sealing connection between the first sealing rubber gasket 12 and the material inlet of the mixing drum 10, thereby improving the sealing reliability of the first sealing rubber gasket 12.

[0045] Optionally, combined Figure 1 As shown, the roller 2 is provided with a conical structure 21, which is used to engage with the flange 20 of the mixing drum 10 through the conical structure 21.

[0046] Specifically, the flange 20 is also provided with a conical structure 21. The conical structure 21 on the roller 2 is fitted with the conical structure 21 on the flange 20, and the roller 2 is engaged with the flange 20 through the conical structure 21.

[0047] Thus, by providing a conical structure 21 on the roller 2, and by engaging the roller 2 with the flange 20 of the mixing drum 10 through the conical structure 21, the contact area between the roller 2 and the flange 20 is reduced. In this way, compared with the contact between the roller 2 and the flange 20 through a plane, the conical structure 21 can reduce friction and extend the service life of the roller 2.

[0048] Optionally, combined Figure 1 As shown, the adjustment structure 3 includes an adjustment screw 31, an adjustment nut 32, and an adjustment sleeve 33. The adjustment screw 31 passes through the plate body 11, the roller 2, and the mounting wall 112 in sequence along the axial direction of the roller 2 and extends out from the mounting wall 112. The adjustment screw 31 is threadedly connected to the adjustment nut 32. The adjustment sleeve 33 is located between the adjustment screw 31 and the mounting wall 112. The two ends of the adjustment sleeve 33 in the axial direction of the adjustment screw 31 abut against the roller 2 and the adjustment nut 32, respectively.

[0049] Specifically, the axial direction of roller 2 is aligned with the X-axis. The adjusting screw 31 passes sequentially from right to left along the X-axis through the plate body 11, roller 2, and mounting wall 112. The left end of the adjusting screw 31 extends from the mounting wall 112. The adjusting nut 32 is threadedly connected to the left end of the adjusting screw 31, and the adjusting sleeve 33 is fitted onto the adjusting screw 31 at the position corresponding to the mounting wall 112. The inner wall of the adjusting sleeve 33 contacts the outer wall of the adjusting screw 31, and the outer wall of the adjusting sleeve 33 contacts the mounting wall 112. The left and right ends of the adjusting sleeve 33 abut against the adjusting nut 32 and roller 2, respectively. During sealing, as the adjusting nut 32 is tightened, it pushes the adjusting sleeve 33, which in turn pushes the roller 2, pressing the roller 2 against the flange 20. Two adjusting nuts 32 can be provided to prevent loosening due to vibration, thus ensuring the self-locking property between the adjusting nut 32 and the adjusting screw 31. Furthermore, if the inflation height of the airbag 15 described above is insufficient for sealing, simply tighten the adjusting nut 32.

[0050] Thus, by adjusting the screw 31, which passes sequentially through the plate body 11, the roller 2, and the mounting wall 112 along the axial direction of the roller 2 and extends out from the mounting wall 112, the two ends of the adjusting screw 31 can be supported by the plate body 11 and the mounting wall 112. The adjusting screw 31 is threadedly connected to the adjusting nut 32, which can adjust the sealing connection between the sealing cover 1 and the material port of the mixing drum 10. Then, by adjusting the sleeve 33 between the adjusting screw 31 and the mounting wall 112, and by having the two ends of the adjusting sleeve 33 abut against the roller 2 and the adjusting nut 32 respectively in the axial direction of the adjusting screw 31, the tightening movement of the adjusting nut 32 can be converted into the thrust of the roller 2 pressing against the flange 20 through the adjusting sleeve 33. In this way, the sealing performance can be adjusted by rotating the adjusting nut 32 during sealing.

[0051] Optionally, combined Figure 1 As shown, a copper sleeve 34 is provided between the adjusting screw 31 and the roller 2.

[0052] Specifically, the copper sleeve 34 is fitted onto the adjusting screw 31 at the position corresponding to the roller 2. The inner wall of the copper sleeve 34 is rotatably connected to the outer wall of the adjusting screw 31, and the outer wall of the copper sleeve 34 is rotatably connected to the inner wall of the roller 2. The copper sleeve 34 can also be replaced by other structures such as bearings.

[0053] Thus, by placing the copper sleeve 34 between the adjusting screw 31 and the roller 2, direct contact between the adjusting screw 31 and the roller 2 is avoided. In this way, when the roller 2 rotates relative to the adjusting screw 31, the copper sleeve 34 can reduce the wear between the adjusting screw 31 and the roller 2.

[0054] Another embodiment of the present invention provides a concrete mixer truck, including the sealing device described above.

[0055] The concrete mixer truck has all the beneficial effects of the sealing device, which will not be elaborated here.

[0056] While the disclosure is as stated above, its scope of protection is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of this disclosure, and all such changes and modifications will fall within the protection scope of this invention.

Claims

1. A sealing device, characterized in that, The system includes a sealing cap (1), rollers (2), and an adjusting structure (3). Multiple rollers (2) are disposed on the same side of the sealing cap (1), and the outer contours of the multiple rollers (2) are used to engage with the flange (20) of the stirring drum (10). The adjusting structure (3) is connected to the sealing cap (1) and the rollers (2) along the axial direction of the rollers (2). When multiple rollers (2) are engaged with the flange (20) of the stirring drum (10), the adjusting structure (3) is used to adjust the rollers (2) along the axial direction of the rollers (2). The rollers (2) apply a pre-tightening force to the sealing cover (1) in the axial direction, so that the sealing cover (1) is sealed to the material inlet of the mixing drum (10) by the pre-tightening force; the sealing cover (1) includes a plate body (11) and a first sealing rubber gasket (12), the plate body (11) is provided with an annular protrusion (111) at one end facing the rollers (2), and the first sealing rubber gasket (12) is sleeved on the annular protrusion (111). When multiple rollers (2) are all connected to the mixing drum When the flange (20) of (10) is snapped together, the first sealing rubber gasket (12) is used to seal the connection with the material port of the mixing drum (10); the plate body (11) is also provided with an annular baffle (13) and a second sealing rubber gasket (14) at one end facing the roller (2). The annular baffle (13) is provided on the side of the first sealing rubber gasket (12) away from the annular protrusion (111), and the second sealing rubber gasket (14) is provided between the first sealing rubber gasket (12) and the annular protrusion (111). Between the baffles (13), when multiple rollers (2) are engaged with the flange (20) of the mixing drum (10), the first sealing rubber gasket (12) and the second sealing rubber gasket (14) are used to seal the material inlet of the mixing drum (10); an airbag (15) is also provided between the first sealing rubber gasket (12) and the second sealing rubber gasket (14), and the airbag (15) abuts against the first sealing rubber gasket (12) and the second sealing rubber gasket (14) respectively.

2. The sealing device according to claim 1, characterized in that, The plate body (11) is provided with a mounting wall (112), which extends to the side of the roller (2) away from the plate body (11). The adjustment structure (3) is connected to the roller (2) and the mounting wall (112) along the axial direction of the roller (2).

3. The sealing device according to claim 2, characterized in that, The dimensions of the annular baffle (13) and the annular protrusion (111) in the axial direction of the first sealing rubber pad (12) are both smaller than the dimensions of the first sealing rubber pad (12).

4. The sealing device according to claim 3, characterized in that, The roller (2) is provided with a conical structure (21), and the roller (2) is used to engage with the flange (20) of the stirring drum (10) through the conical structure (21).

5. The sealing device according to claim 4, characterized in that, The adjustment structure (3) includes an adjustment screw (31), an adjustment nut (32), and an adjustment sleeve (33). The adjustment screw (31) passes through the plate body (11), the roller (2), and the mounting wall (112) in sequence along the axial direction of the roller (2) and extends out from the mounting wall (112). The adjustment screw (31) is threadedly connected to the adjustment nut (32). The adjustment sleeve (33) is located between the adjustment screw (31) and the mounting wall (112). The two ends of the adjustment sleeve (33) in the axial direction of the adjustment screw (31) abut against the roller (2) and the adjustment nut (32), respectively.

6. The sealing device according to claim 5, characterized in that, A copper sleeve (34) is provided between the adjusting screw (31) and the roller (2).

7. A concrete mixer truck, characterized in that, Includes the sealing device as described in any one of claims 1 to 6.

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