Material sealing device and mixer truck

Abstract

The invention relates to the field of mixer trucks, and discloses a material sealing device and a mixer truck. The material sealing device is applied to the mixer truck, the mixer truck comprises a material guide barrel and a feeding hopper, and the material guide barrel is located in a mixing barrel. The material sealing device comprises a base plate, the base plate is a flexible plate capable of being bent into a circular arc shape in the plate length direction, and the base plate is used for being installed on the feeding hopper. The friction layer is arranged on the outer plate surface of the base plate and is arranged in a strip shape in the plate length direction, and oil outlet holes are formed in the friction surface of the friction layer; the elastic extrusion layer is arranged between the base plate and the friction layer in a cushioned mode, and an oil storage cavity used for supplying oil to the oil outlet holes is formed in the elastic extrusion layer. The agitating lorry comprises a material guide barrel; the feed hopper comprises a tail circular ring extending into the guide cylinder; the invention discloses a material sealing device. Wherein the base plate wraps the peripheral wall of the bottom of the tail circular ring, and the two ends, in the plate length direction, of the elastic extrusion layer are both lower than the center of the tail circular ring. According to the material sealing device and the mixer truck, the sealing performance between the feeding hopper and the material guide barrel can be improved.

Description

Technical Field

[0001] The present application belongs to the field of mixer trucks, and specifically, relates to a sealing device and a mixer truck. Background Art

[0002] The rear end of the mixing drum of a concrete mixer truck is usually equipped with a guide cylinder, and the material is fed into the mixing drum through the feed hopper. In order to ensure the normal rotation of the mixing drum, a certain size of reserved gap is usually set between the guide cylinder and the feed hopper, such as Figure 1 and Figure 2 shown.

[0003] However, when a mixer truck passes through muddy, bumpy, or hilly roads, the concrete mortar in the mixing drum can easily overflow from the reserved gap, spill or even solidify on the road surface, making it difficult to clean up. Summary of the invention

[0004] The purpose of the present application is to provide a sealing device and a mixing truck to improve the sealing performance between a feed hopper and a material guide barrel.

[0005] To achieve the above-mentioned purpose, the present application provides a sealing device on one hand, which is applied to a mixing truck. The mixing truck includes a material guide cylinder and a feed hopper. The material guide cylinder is located in the mixing drum. The sealing device includes:

[0006] The base plate is a flexible plate that can be bent into an arc shape along the length of the plate, and the base plate is used to be installed on the feed hopper;

[0007] The friction layer is arranged on the outer surface of the base plate and is arranged in strips along the length of the base plate. The friction surface of the friction layer is formed with oil outlet holes.

[0008] The elastic extrusion layer is cushioned between the base plate and the friction layer, and an oil storage cavity for supplying oil to the oil outlet hole is formed in the elastic extrusion layer.

[0009] In some embodiments, the friction layer includes a peripheral lip, which is arranged around the outer circumference of the friction surface and defines an oil film cavity located on the friction surface.

[0010] In some embodiments, the friction layer further includes a plurality of lubricating oil channels provided on the friction surface and arranged in sequence and at intervals along the length direction of the plate, and the lubricating oil channels are in the shape of inclined grooves extending along the width direction of the friction layer.

[0011] In some embodiments, the oil outlet holes are arranged at both ends of the friction layer.

[0012] In some embodiments, the elastic extrusion layer comprises:

[0013] The elastic support member is located in the oil storage cavity and elastically supported between the base plate and the friction layer.

[0014] In some embodiments, the elastic support member has a lower hardness than the elastic extrusion layer.

[0015] In some embodiments, the elastic extrusion layer includes an elastic peripheral side wall extending from the periphery of the friction layer to the outer plate surface of the base plate, and the elastic peripheral side wall surrounds the inner cavity formed to form an oil storage cavity.

[0016] In some embodiments, a through-mounting hole connected to the oil storage cavity and a cover plate are provided on the base plate, and the cover plate is detachably sealed on the through-mounting hole.

[0017] In some embodiments, the sealing device further comprises:

[0018] The end scrapers extend obliquely outward from both ends of the elastic extrusion layer.

[0019] In some embodiments, the sealing device comprises:

[0020] The side plate extends from the edge of the base plate in the shape of a folded plate and extends along the length of the plate.

[0021] In some embodiments, an inclination angle between an extension direction of the end scraper and a width direction of the elastic extrusion layer is greater than a concrete accumulation angle.

[0022] On the other hand, the present application protects a mixer truck, which comprises:

[0023] Guide barrel;

[0024] A feed hopper, including a tail ring extending into the guide barrel;

[0025] The sealing device mentioned above;

[0026] The base plate is wrapped around the bottom outer peripheral wall of the tail ring, and both ends of the elastic extrusion layer along the length direction of the plate are lower than the center of the tail ring.

[0027] In some embodiments, two ends of the substrate are fixedly mounted on the outer peripheral wall of the tail ring, or two ends of the substrate are detachably clamped on the bottom outer peripheral wall of the tail ring.

[0028] Through the above technical solution, the sealing device provided in the embodiment of the present application has the following beneficial effects:

[0029] In the technical solution of the present application, the sealing device can be installed on the tail ring of the feed hopper through a base plate to provide sealing between the guide barrel and the feed hopper, and supply oil to the friction surface through the oil storage chamber via the oil outlet hole to avoid dry friction between the friction layer and the guide barrel, thereby extending the service life of the sealing device and improving the dynamic sealing effect. In addition, during the operation of the mixer truck, the mixing drum is affected by the weight of the concrete and the bumps of the driving road surface. After the mixing drum undergoes slight deformation and sinking to varying degrees, that is, the size of the reserved gap between the guide barrel and the feed hopper changes, the elastic extrusion layer can follow the gap change through its own elastic deformation, thereby ensuring the dynamic sealing effect between the guide barrel and the feed hopper. Compared with the sealing method of multiple sealing rings in the prior art, the sealing device of the present application has a simple structure, which not only improves the adaptability of the sealing device to the deformation of the mixing drum, but also ensures the dynamic sealing effect.

[0030] Other features and advantages of the embodiments of the present application will be described in detail in the subsequent specific implementation section. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The accompanying drawings are used to provide a further understanding of the embodiments of the present application and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the embodiments of the present application, but do not constitute a limitation on the embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without creative work. In the drawings:

[0032] Figure 1 It is a schematic diagram of the assembly structure of the feed hopper and the guide barrel of the mixer truck;

[0033] Figure 2 for Figure 1 A cross-sectional view of the assembly structure of the feed hopper and the guide cylinder;

[0034] Figure 3 It is a structural schematic diagram of a sealing device according to a specific embodiment of the present application;

[0035] Figure 4 for Figure 3 A front view of the sealing device in FIG.

[0036] Figure 5 for Figure 3 A cross-sectional view of a sealing device in FIG.

[0037] Figure 6 for Figure 3 A schematic diagram of the structure of the sealing device after curling;

[0038] Figure 7 for Figure 3 A cross-sectional view of the oil storage chamber of the sealing device;

[0039] Figure 8 for Figure 3 A schematic structural diagram of an elastic support member of a middle sealing device;

[0040] Fig. 9 A front view of a friction layer of a sealing device according to one embodiment;

[0041] Fig.10 A front view of a friction layer of a sealing device according to another embodiment;

[0042] Fig.11 A front view of a friction layer of a sealing device according to another embodiment;

[0043] Fig.12 A cross-sectional view of a material sealing device along an edge plate according to an embodiment;

[0044] Fig.13 A cross-sectional view along an edge plate of a sealing device according to another embodiment;

[0045] Fig.14 A cross-sectional view along an edge plate of a sealing device according to another embodiment;

[0046] Fig.15 for Figure 3 Schematic diagram of the structure of the sealing device being assembled on the mixer truck.

[0047] Description of Reference Numerals

[0048] L Plate length direction G Reserved gap

[0049] h1 end height h2 center height

[0050] 100 Guide tube 200 Tail ring

[0051] 300 sealing device 310 substrate

[0052] 311 Edge plate 312 Cover plate

[0053] 320 elastic extrusion layer 321 oil storage chamber

[0054] 322 oil outlet hole 323 elastic support member

[0055] 323a Flow channel 324 End scraper

[0056] 325 Oil inlet nozzle 330 Friction layer

[0057] 331 Lubricating oil channel 332 Peripheral lip DETAILED DESCRIPTION

[0058] The specific implementation of the present application is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the present application, and is not used to limit the present application.

[0059] The sealing device and the mixer truck according to the present application are described below with reference to the accompanying drawings.

[0060] The present application discloses a novel material sealing device, which is applied to a mixing truck. The mixing truck comprises a material guide barrel 100 and a feed hopper. The material guide barrel 100 is located in the mixing barrel. Figure 3 As shown, a sealing device 300 in a specific embodiment includes:

[0061] A base plate 310, the base plate 310 is a flexible plate that can be bent into an arc shape along a plate length direction L, and the base plate 310 is used to be installed on the feed hopper;

[0062] The friction layer 330 is disposed on the outer surface of the base plate 310 and arranged in a strip shape along the plate length direction L. The friction surface of the friction layer 330 is formed with oil outlet holes 322;

[0063] The elastic extrusion layer 320 is cushioned between the base plate 310 and the friction layer 330 , and an oil storage cavity 321 for supplying oil to the oil outlet hole 322 is formed in the elastic extrusion layer 320 .

[0064] Specifically, see Figure 3 , Figure 4 and Fig.15 , the base plate 310 is bent and arranged to fit the outer peripheral wall of the feed hopper, and the friction layer 330 and the guide tube 100 are slid and rubbed, and an elastic extrusion layer 320 is provided between the friction layer 330 and the base plate 310, so as to jointly close the reserved gap G between the guide tube 100 and the feed hopper. The elastic extrusion layer 320 can make the sealing device 300 adapt to the size change of the reserved gap G through elastic deformation, thereby improving the sealing effect. Since the long-term dry friction between the friction layer 330 and the rotating guide tube 100 will generate a lot of heat, which seriously affects the life of the sealing device 300 and the guide tube 100, an oil storage cavity 321 is provided in the elastic extrusion layer 320, and the oil storage cavity 321 supplies oil to the friction surface of the friction layer 330 through the oil outlet 322 to provide lubrication. Compared with the sealing method of multiple sealing rings in the prior art, the sealing device 300 of the present application has a simple structure, which not only improves the gap change adaptability of the sealing device 300, but also ensures the dynamic sealing effect. In addition, the provision of the oil storage chamber 321 can also ensure that when the external lubrication system fails and the grease (or lubricating oil) is not supplied in place, the oil storage chamber 321 can continue to ensure the lubrication required for the dynamic seal.

[0065] The substrate 310, the elastic extrusion layer 320 and the friction layer 330 may be integrally formed or connected by bonding or other methods; the sealing device 300 should be made of organic materials or composite materials with low friction coefficient, high wear resistance and high elasticity, such as polyurethane composite materials, rubber composite materials, etc., to reduce friction, reduce operating losses, and ensure the follow-up sealing effect of the sealing device 300 following the size change of the preset gap G. The sealing device 300 may also be provided with an oil inlet nozzle 325 that is connected to the oil storage chamber 321 and can be opened and closed to supply oil to the oil storage chamber 321, thereby improving the maintainability and convenience of the sealing device 300.

[0066] In this embodiment, if Figure 5 and Figure 7 As shown, the friction layer 330 may include a circumferential lip 332, which is arranged around the outer periphery of the friction surface and defines an oil film cavity on the friction surface. Specifically, after the circumferential lip 332 abuts against the material guide barrel 100, the lubricating oil (or grease) can be sealed in the lubricating space enclosed by the circumferential lip 332, the material guide barrel 100 and the friction surface, thereby forming an oil film cavity, which can not only improve the lubrication effect, but also prevent the lubricating oil and grease from being consumed too quickly, greatly extending the service life and maintenance cycle of the sealing device 300. In addition, the circumferential lip 332 can also prevent sand and gravel in the mixing barrel from entering the friction surface, further ensuring the effect of dynamic sealing.

[0067] In this embodiment, if Fig.10 As shown, the friction layer 330 may also include a plurality of lubricating oil passages 331 disposed on the friction surface and arranged in sequence along the plate length direction L, and the lubricating oil passages 331 are in the shape of inclined grooves extending along the width direction of the friction layer 330. The lubricating oil passages 331 can accommodate lubricating oil and grease, thereby increasing the accommodation capacity of the oil film cavity and the contact area between the lubricating oil and grease and the friction surface, so that the lubricating grease and lubricating oil are more evenly distributed in the oil film cavity. Fig.10 The rotation direction or opening direction of the lubricating oil passage 331 shown can be set to be consistent with the rotation direction of the blades of the mixing drum, so that the fine sand entering the sealing contact surface can be rotated out without being retained in the lubricating oil passage 331 and affecting the lubrication effect.

[0068] Of course, the lubricating oil passage 331 can be arranged in a variety of ways, not limited to Fig.10 As shown, it can also be Fig. 9 As shown, the lubricating oil channel 331 is parallel to the plate length direction L, and the openings are located at both ends of the length direction of the friction layer 330. Fig. 9 As shown, the serpentine groove is arranged in a meandering shape, and the end openings of the serpentine grooves are arranged on the same side of the friction layer 330 .

[0069] In this embodiment, if Figure 3 and Figure 4As shown, the oil outlet holes 322 can be arranged at both ends of the friction layer 330. Since concrete generally flows out from the bottom of the reserved gap G, arranging the oil outlet holes 322 at both ends away from the bottom can reduce the possibility of sand and gravel entering the oil outlet holes 322, thereby ensuring the lubrication effect of the sealing device 300 and extending the maintenance period of the sealing device 300. The number of the oil outlet holes 322 is not limited to Figure 3 Twelve are shown, but other numbers are possible.

[0070] In this embodiment, if Figure 5 and Figure 8 As shown, the elastic extrusion layer 320 may include an elastic support member 323, which is located in the oil storage cavity 321 and elastically supported between the base plate 310 and the friction layer 330. Figure 5 Since the sealing device 300 has a relatively large overall size, the oil storage cavity 321 may be sunken during the deformation of the elastic extrusion layer 320, thereby affecting the sealing effect. Therefore, an elastic support member 323 may be provided in the oil storage cavity 321 to elastically support between the substrate 310 and the friction layer 330.

[0071] In this embodiment, the elastic support member 323 may be made of a low-hardness, high-elastic material, and the hardness of the elastic support member 323 may be lower than that of the elastic extrusion layer 320 to improve the overall resilience of the sealing device 300. Optionally, the hardness of the elastic support member 323 is between 70% and 75% of the elastic extrusion layer 320 or the substrate 310. For example, the hardness of the elastic support member 323 may be 50HA. In other embodiments, a flow channel 323a is further provided inside the elastic support member 323, such as Figure 8 As shown, the flow channel 323a can improve the fluidity of the lubricating oil or grease in the oil storage chamber 321, prevent the lubricating oil or grease from accumulating, and thus ensure the oil supply effect. Of course, it can be understood by those skilled in the art that the shape of the elastic support member 323 is not limited to Figure 8 As shown, it can also be C-shaped or V-shaped.

[0072] In this embodiment, if Figure 5 and Figure 7 As shown, the elastic extrusion layer 320 may include an elastic peripheral side wall extending from the periphery of the friction layer 330 to the outer plate surface of the base plate 310, and the elastic peripheral side wall surrounds the inner cavity formed to form an oil storage cavity 321. Figure 7 The elastic peripheral sidewall can enhance the deformation capability of the elastic extrusion layer 320 following the size change of the reserved gap G. Of course, the elastic peripheral sidewall is not limited to a continuously connected wavy structure, and can also be a continuously connected V-shaped structure.

[0073] In some embodiments, Figure 5As shown, the base plate 310 may be provided with a through-mounting hole connected to the oil storage chamber 321 and a cover plate 312, and the cover plate 312 may be detachably sealed on the through-mounting hole. Figure 5 , the cover plate 312 is clamped on the base plate 310. In this way, the cover plate 312 can seal the elastic support member 323 in the oil storage cavity 321 and seal the lubricating oil or grease. Of course, in some other embodiments, in order to prevent the cover plate 312 from falling off, the overlapping surface of the cover plate 312 and the base plate 310 can be fixed by rivets.

[0074] In this embodiment, if Figure 3 , Figure 4 and Figure 6 As shown, the sealing device 300 may further include:

[0075] The end scrapers 324 extend outwardly from both ends of the elastic extrusion layer 320. The end scrapers 324 can scrape off the sand and gravel on the guide barrel 100, prevent the sand and gravel from entering the friction surface to ensure the dynamic sealing effect, and pad the sealing area in the reserved gap G.

[0076] Specifically, see Figure 3 , one end of the end scraper 324 can be connected to the bottom edge of the elastic extrusion layer 320, and the other end extends obliquely upward. It should be noted that in order to prevent sand and gravel from entering the friction surface, the end scraper 324 generally needs to be raised, that is, higher than the peripheral lip 332. Therefore, the end scraper 324 also needs to have good elasticity and be able to follow the size change of the reserved gap G to ensure the dynamic sealing effect. Obviously, those skilled in the art can understand that the end scraper 324 can also be designed as a continuously connected wavy structure, or a continuously connected V-shaped structure, etc. The end scraper 324 with good elasticity not only improves the dynamic sealing effect of the end scraper 324, but also does not affect the overall assembly of the sealing device 300 due to the end scraper 324.

[0077] In this embodiment, the inclination angle between the extension direction of the end scraper 324 and the width direction of the elastic extrusion layer 320 is greater than the accumulation angle of concrete, so as to prevent the concrete from accumulating on the end scraper 324 .

[0078] In this embodiment, if Figure 3 , Figure 4 , Figure 12 to Figure 14 As shown, the sealing device 300 may include:

[0079] The side plate 311 extends from the edge of the base plate 310 in a folded plate shape and extends along the length direction L of the plate.

[0080] like Figure 12 to Figure 14As shown, the extended end of the edge plate 311 can provide shielding for the elastic extrusion layer 320 after being attached to the material guide barrel 100, so as to prevent the concrete in the mixing barrel from directly impacting the elastic extrusion layer 320 and prevent sand and gravel from mixing into the friction surface, thereby improving the maintenance cycle and service life of the sealing device 300. Of course, the edge plate 311 can be arranged in various forms, not limited to Figure 3 As shown, it can also be Figure 12 to Figure 14 The processing method of the edge plate 311 is not limited to being installed on the base plate 310 by fastening connectors, and can also be cast together with the base plate 310 to reduce cracks caused by bending the edge plate 311 during installation and ensure the fit between the edge plate 311 and the guide tube 100, thereby extending the overall service life.

[0081] On the basis of the above, the present application also discloses a new type of mixer truck, such as Fig.15 As shown, a concrete embodiment of the mixer truck includes:

[0082] Material guide cylinder 100;

[0083] The feed hopper includes a tail ring 200 extending into the guide cylinder 100;

[0084] The sealing device 300 mentioned above;

[0085] The base plate 310 is wrapped around the outer peripheral wall of the tail ring 200 , and both ends of the elastic extrusion layer 320 along the plate length direction L are lower than the center of the tail ring 200 .

[0086] See also Fig.15 , the sealing device 300 is wrapped around the outer peripheral wall of the tail ring 200 and arranged symmetrically relative to the center of the tail ring 200, and the end height h1 of the elastic extrusion layer 320 is lower than the center height h2 of the tail ring 200. In this way, it can be ensured that after installation, the sealing device 300 can squeeze the elastic extrusion layer 320 by the weight of the feed hopper itself, so that the elastic extrusion layer 320 obtains a pre-compression amount, thereby being able to utilize the rebound tendency of the elastic extrusion layer 320 to enhance the sealing effect of the elastic extrusion layer 320. In addition, compared with the method of using elastic parts to seal the reserved gap G around the entire circumference in the prior art, the sealing device 300 of the present application only seals the leakage area in the reserved gap G, that is, the bottom area, which not only saves material costs, but also saves installation costs, and does not require operators to use tools such as crowbars and other time-consuming and laborious tools to ensure the overall embedding of the elastic parts.

[0087] Furthermore, the substrate 310 can be directly cast on the tail ring 200 to simplify the installation steps and improve the fitting effect. The substrate 310 can also be directly cast on the tail ring 200 to reduce cracks caused by bending during installation of the substrate 310, thereby extending the overall service life.

[0088] In this embodiment, two ends of the base plate 310 are detachably clamped on the bottom outer peripheral wall of the tail ring 200 .

[0089] Specifically, L-shaped card plates may be formed on both sides of the tail ring 200, and a mounting slot is formed between the L-shaped card plate and the tail ring 200. The two ends of the substrate 310 along the plate length direction L are respectively connected to the mounting slots. In this way, it is helpful to ensure that the two sides of the sealing device 300 are equal in height, thereby avoiding leakage at the lower end. Through the card slot connection method, it is also convenient to fix the two ends of the sealing device 300 on the tail ring 200. In some embodiments, the two ends of the substrate 310 are fixedly installed on the bottom peripheral wall of the tail ring 200, that is, the end of the sealing device 300 is fixed to the tail ring 200 by a fastener detachably connected to the tail ring 200, so as to ensure that the overall fit is tight and avoid warping.

[0090] In summary, when the sealing device 300 according to the present application is installed on the tail ring 200 of the feed hopper, in order to achieve the sealing of the reserved gap G between the guide cylinder 100 and the tail ring 200, the sealing device 300 can be set at the bottom of the reserved gap G, and adapt to the gap change through the elastic deformation ability of the elastic extrusion layer 320. The elastic support member 323 and the wavy elastic peripheral side wall arranged in the oil storage cavity 321 can not only further ensure the sealing effect after improving the elastic deformation ability of the elastic extrusion layer 320, but also prevent the oil storage cavity 321 from collapsing. Among them, the friction layer 330 should be set to a certain width to adapt to the sliding amount of the mixing drum when switching between the no-load and full-load states to prevent sealing failure. And the hardness of the elastic support member 323 should be lower than the hardness of the elastic extrusion layer 320 to facilitate overall bending, thereby reducing the overall installation difficulty and improving the fitting effect with the tail ring 200.

[0091] In order to prevent the friction layer 330 from generating a large amount of heat due to long-term dry friction with the rotating material guide cylinder 100, the oil storage cavity 321 can continuously supply oil lubrication to the friction surface through the oil outlet hole 322 to reduce the wear of the sealing device 300 and the material guide cylinder 100. The setting of the peripheral lip 332 not only facilitates the rapid formation of the oil film cavity, further improves the lubrication effect, but also greatly extends the service life and maintenance cycle of the sealing device 300. The friction surface can also form multiple lubricating oil channels 331 to promote a more uniform distribution of grease and oil in the oil film cavity.

[0092] In order to prevent the gravel in the mixing drum from entering the friction surface and destroying the lubrication effect. The lubricating oil channel 331 can be tilted to facilitate the rotation of the gravel entering the friction surface and increase the service life of the sealing rubber plate. The end scraper 324 can also scrape off the gravel on the guide barrel 100 to ensure the lubrication effect and prevent wear. In addition, the edge plate 311 can be set to provide shielding for the elastic extrusion layer to prevent the concrete in the mixing drum from directly impacting the elastic extrusion layer 320 and to prevent gravel from mixing into the friction surface. Among them, the end scraper 324 can also raise the sealing area in the reserved gap G, and the inclination angle of the end scraper 324 relative to the width direction of the elastic extrusion layer 320 is greater than the accumulation angle of concrete, thereby preventing concrete from accumulating on the end scraper 324.

[0093] In order to facilitate the installation of the sealing device 300, L-shaped clamping plates can be formed on both sides of the tail ring 200, and a mounting slot is formed between the L-shaped clamping plate and the tail ring 200. The base plate 310 symmetrically surrounds the bottom peripheral wall of the tail ring 200 along the plate length direction L, and the two ends are clamped in the mounting slot. Among them, the end height h1 of the elastic extrusion layer 320 is lower than the center height h2 of the tail ring 200, so as to ensure that the sealing device 300 can squeeze the elastic extrusion layer 320 by the weight of the feed hopper itself after installation, so that the elastic extrusion layer 320 obtains a pre-compression amount, and the rebound tendency of the elastic extrusion layer 320 is used to improve the sealing effect of the elastic extrusion layer 320.

[0094] In the description of the present application, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present application, "plurality" means at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0095] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0096] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

Claims

1. A sealing device, applied to a mixing truck, the mixing truck comprising a material guide cylinder (100) and a feed hopper, wherein the material guide cylinder (100) is located in the mixing drum, and is characterized in that: The material sealing device (300) comprises: A base plate (310), the base plate (310) being a flexible plate that can be bent into an arc shape along a plate length direction (L), and the base plate (310) is used to be installed on the feed hopper; A friction layer (330) is provided on the outer plate surface of the base plate (310) and arranged in a strip shape along the plate length direction (L), and an oil outlet hole (322) is formed on the friction surface of the friction layer (330); The elastic extrusion layer (320) is cushioned between the substrate (310) and the friction layer (330), and an oil storage cavity (321) for supplying oil to the oil outlet hole (322) is formed in the elastic extrusion layer (320).

2. The sealing device according to claim 1, characterized in that: The friction layer (330) comprises a peripheral lip (332), wherein the peripheral lip (332) is arranged around the outer periphery of the friction surface and defines an oil film cavity located on the friction surface.

3. The sealing device according to claim 2, characterized in that: The friction layer (330) further comprises a plurality of lubricating oil passages (331) provided on the friction surface and arranged in sequence and at intervals along the plate length direction (L); the lubricating oil passages (331) are in the form of inclined grooves extending along the width direction of the friction layer (330).

4. The sealing device according to claim 1, characterized in that: The oil outlet holes (322) are arranged at both end portions of the friction layer (330).

5. The sealing device according to claim 1, characterized in that: The elastic extrusion layer (320) comprises: An elastic support member (323) is located in the oil storage cavity (321) and elastically supported between the base plate (310) and the friction layer (330).

6. The sealing device according to claim 5, characterized in that: The elastic support member (323) has a lower hardness than the elastic extrusion layer (320).

7. The sealing device according to claim 1, characterized in that: The elastic extrusion layer (320) comprises an elastic peripheral side wall extending from the peripheral edge of the friction layer (330) to the outer plate surface of the base plate (310), and the inner cavity formed around the elastic peripheral side wall is formed into the oil storage cavity (321).

8. The material sealing device according to claim 7, characterized in that: The base plate (310) is provided with a through-mounting hole connected to the oil storage chamber (321) and a cover plate (312), and the cover plate (312) is detachably sealed on the through-mounting hole.

9. The sealing device according to claim 1, characterized in that: The material sealing device (300) further comprises: The end scrapers (324) are extended outwardly at an angle from both ends of the elastic extrusion layer (320).

10. The material sealing device according to claim 9, characterized in that: The inclination angle between the extension direction of the end scraper (324) and the width direction of the elastic extrusion layer (320) is greater than the concrete accumulation angle.

11. The sealing device according to any one of claims 1 to 10, characterized in that: The material sealing device (300) comprises: The side plate (311) extends from the edge of the base plate (310) in a folded plate shape and extends along the length direction (L) of the plate.

12. A mixer truck, characterized in that: The mixer truck comprises: A material guide cylinder (100); A feed hopper, comprising a tail ring (200) extending into the guide cylinder (100); The sealing device (300) according to any one of claims 1 to 11; The base plate (310) is wrapped around the outer peripheral wall of the tail ring (200), and both ends of the elastic extrusion layer (320) along the plate length direction (L) are lower than the center of the tail ring (200).

13. The mixer truck according to claim 12, characterized in that: The two ends of the base plate (310) are fixedly mounted on the bottom peripheral wall of the tail ring (200), or the two ends of the base plate (310) are detachably clamped on the bottom peripheral wall of the tail ring (200).

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