CN112297238A

CN112297238A - Sealed trucd mixer of gyration

Info

Publication number: CN112297238A
Application number: CN202011184039.5A
Authority: CN
Inventors: 刘云昌; 侯琨; 王飞
Original assignee: Wuhu Cimc Ruijiang Automobile Co Ltd
Current assignee: Wuhu Cimc Ruijiang Automobile Co Ltd
Priority date: 2020-10-29
Filing date: 2020-10-29
Publication date: 2021-02-02

Abstract

The invention provides a mixer truck which is reliable in sealing, can reduce the water loss of concrete in the transportation process and ensures the quality of the concrete, and the mixer truck comprises a truck frame, wherein a mixing drum is rotatably connected to the truck frame; the sealing assembly comprises a sealing cover, and the sealing cover is used for opening or closing the feed and discharge port of the stirring cylinder; the sealing cover can also perform turnover motion relative to the stirring cylinder, so that the sealing cover can be switched between a first position state and a second position state back and forth, and when the sealing cover is in the first position state, the sealing cover is positioned between the stirring cylinder and the feeding hopper; when the sealing cover is in the second position state, the sealing cover is positioned on one side of the feed hopper, which is far away from the mixing drum.

Description

Sealed trucd mixer of gyration

Technical Field

The invention relates to the technical field of tank type transport vehicles, in particular to a rotary sealed mixer truck.

Background

The mixer truck is a special vehicle widely applied to engineering and building industries, can automatically complete charging and discharging work, and requires to continuously stir materials in a mixing drum at a constant speed in the transportation process so as to ensure the quality of the materials. The discharge port of the concrete mixer truck in the existing market is open, so that the concrete is easy to increase and decrease water and leak materials in the transportation process, and the requirement of a user cannot be met.

Disclosure of Invention

The invention aims to provide the mixer truck which is reliable in sealing, can reduce the water loss of concrete in the transportation process and ensures the quality of the concrete.

In order to solve the technical problems, the invention adopts the following technical scheme:

a rotary sealed mixer vehicle comprising:

the frame is rotatably connected with a stirring drum;

the sealing assembly comprises a sealing cover, and the sealing cover is used for opening or closing the feed and discharge port of the stirring cylinder;

the feed hopper is used for inputting materials into the mixing drum through the feed and discharge port;

the first driving mechanism is in transmission connection with the feeding hopper and is used for driving the feeding hopper to move back and forth along the axial direction of the mixing drum;

the second driving mechanism is in transmission connection with the sealing cover and is used for driving the sealing cover to move back and forth along the axial direction of the mixing drum and turn over relative to the feeding hopper so as to enable the sealing cover to be switched between a first position state and a second position state; when the sealing cover is in a first position state, the sealing cover is positioned between the mixing drum and the feed hopper; when the sealing cover is in the second position state, the sealing cover is positioned on one side of the feed hopper, which is deviated from the mixing drum.

Preferably, the sealing assembly further comprises a slewing bearing, the slewing bearing comprises an outer ring, an inner ring rotatably connected in the outer ring, and a slewing body accommodated between the outer ring and the inner ring, the outer ring is fixedly connected with the sealing cover, and the inner ring is fixedly connected with the frame.

Preferably, the sealing cover comprises an accommodating part and a sealing part which are connected in the front-back direction along the axial direction, a space enclosed by the accommodating part forms an accommodating area, and the rear end part of the mixing drum can be accommodated in the accommodating area; the preceding terminal surface of sealing portion extends backward and is formed with the mounting groove, be equipped with interior sealing washer in the mounting groove.

Preferably, a connecting part is mounted on the rear end face of the mixing drum, and the connecting part can be accommodated in an accommodating area of the accommodating part; the inner peripheral wall of the containing part extends outwards to form a ring groove, an outer sealing ring is assembled in the ring groove, and the outer sealing ring is partially located in the containing area.

Preferably, the rear end of the mixer truck is further equipped with a limiting ring, and the limiting ring is located at the butt joint of the mixing drum and the connecting part.

Preferably, the frame is fixedly connected with at least two supporting beams, the supporting beams are located on two sides of a feeding and discharging port of the mixing drum, the length direction of the supporting beams is parallel to the axial direction of the mixing drum, the second driving mechanism comprises a second telescopic piece, a second wheel shaft and a turnover frame, the two axial ends of the second wheel shaft are rotatably connected with walking wheels, the walking wheels are connected to the supporting beams in a rolling mode, the second telescopic piece is used for driving the second wheel shaft to move back and forth along the axial direction of the mixing drum, and the turnover frame is fixedly connected to the second wheel shaft and can rotate relative to the supporting beams.

Preferably, the two axial ends of the second wheel shaft are sleeved with gears, the support beam is fixedly connected with a rack, the rack extends along the length direction of the support beam, the rack has a preset length, and after the gears are separated from the front end of the rack, the axis of the sealing cover and the axis of the mixing drum are in the same straight line.

Preferably, the first driving mechanism comprises a first telescopic piece and a first wheel shaft, the first wheel shaft is positioned below the second wheel shaft, and is fixedly connected with the rear end of the feed hopper through a support frame and can move back and forth along the length direction of the support beam.

Preferably, the roll-over stand is connected with a ball head, a ball head mounting seat is sleeved outside the ball head, and the ball head mounting seat is fixedly connected with an inner ring of the slewing bearing.

Preferably, the front ends of the two support beams are fixedly connected with a background on the frame through a connecting beam.

According to the technical scheme, the rotary sealing mixer truck provided by the invention at least has the following advantages and positive effects:

1. the inner sealing ring, the mixing drum and the sealing part are in surface contact, so that inner sealing is realized; the outer sealing ring is in surface contact with the connecting part and the accommodating part to realize outer sealing; the material can be effectively isolated through the inner seal and the outer seal, the outward permeation of the material is effectively prevented, and the sealing is reliable.

2. The inner sealing ring and the outer sealing ring rotate along with the rotation of the mixing drum, namely, the inner sealing ring and the outer sealing ring both adopt a static sealing mode, so that the inner sealing ring and the outer sealing ring are not easy to wear after being used for a long time, and the sealing performance is guaranteed.

3. The sealed pressfitting of lid is in the transportation on the business turn over material mouth of churn, can effectively delay the moisture evaporation of concrete, reduces the moisture loss, has guaranteed the quality of concrete.

4. Can adjust the angle of sealed lid through the bulb, reduce jar and rotate the in-process jar and beat too big, perhaps the adverse effect that the too big brought of installation error has guaranteed the sealed validity of sealed lid.

Drawings

Fig. 1 is a schematic view of the overall structure of a rotary sealed mixer truck according to an embodiment of the present invention.

Fig. 2 and 3 are schematic structural views of a portion where the rear seal assembly is located in the embodiment of the present invention.

Fig. 4 is a partial structural view of a seal assembly in an embodiment of the invention.

Fig. 5 is a schematic structural view of the portion of fig. 4 where the slewing bearing is located.

Fig. 6 is a schematic view of the structure of the sealing cap of fig. 4.

The reference numerals are explained below:

1. a frame; 11. a background; 2. a mixing drum; 21. a connecting portion; 22. a limiting ring; 3. a seal assembly; 30. a second telescoping member; 303. an outer sealing ring; 304. an inner seal ring; 31. a support beam; 32. a connecting beam; 33. a sealing cover; 331. an inner seal ring; 332. an outer sealing ring; 333. a slewing bearing; 3331. an outer ring; 3332. an inner ring; 334. a ball head mounting seat; 335. a ball head; 336. a sealing part; 337. a housing part; 34. a first axle; 35. a second wheel axle; 36. a roller; 371. a gear; 372. a rack; 38. a roll-over stand; 39. a first telescoping member; 4. a feed hopper.

Detailed Description

Exemplary embodiments that embody features and advantages of the invention are described in detail below in the specification. It is to be understood that the invention is capable of other embodiments and that various changes in form and details may be made therein without departing from the scope of the invention and the description and drawings are to be regarded as illustrative in nature and not as restrictive.

Referring to fig. 1, the embodiment provides a rotary sealed mixer truck, which can be used for mixing and transporting concrete. The mixer truck generally comprises a frame 1, a mixing drum 2 rotatably mounted on the frame 1, a seal assembly 3 connected to the frame 1, and a hopper 4.

The mixing drum 2 can rotate relative to the frame 1 and is used for mixing materials in the mixing drum. The rear end of the mixing drum 2 is open, and a material inlet and a material outlet of the mixing drum 2 are formed.

The mixing drum 2 is used for mixing concrete materials in the mixing drum through rotation relative to the frame 1, and the sealing assembly 3 is used for opening or closing a material inlet and a material outlet of the mixing drum 2. When the feed inlet and the discharge outlet of the mixing drum 2 are opened, the feed hopper 4 can input concrete into the mixing drum 2 through the feed inlet and the discharge outlet, or the concrete in the mixing drum 2 is output outwards under the action of the helical blades in the mixing drum 2. In the transportation process, the feed inlet and the discharge outlet of the mixing drum 2 are sealed by the sealing component 3, so that the water evaporation of the concrete is delayed, the water loss is reduced, and the quality of the concrete is ensured.

The embodiment of the invention mainly optimizes the connection mode of the sealing component 3 and the feed hopper 4, and the related structures of the frame 1 and the feed hopper 4 can refer to the related technologies, which are not repeated in the application.

Referring to fig. 1 again, in the trucd mixer of this embodiment, the rear end tip of churn 2 is equipped with the business turn over material mouth, feeder hopper 4 correspond to the business turn over material mouth setting of churn 2, and feeder hopper 4 and seal assembly 3 homoenergetic move along the axial of churn 2, and wherein, seal assembly 3 can also carry out the turnover motion relative churn 2.

Referring to fig. 4 or 5, the seal assembly 3 includes a rotary support including an outer ring 3332, an inner ring 3331 rotatably coupled to the inner ring 3332, and a rotary body accommodated between the outer ring 3332 and the inner ring 3331, and a seal cover 33, the outer ring 3332 and the inner ring 3331 being rotatably coupled by the rotary body. The outer ring 3332 and the inner ring 3331 are both substantially annular in configuration, the seal 33 is a cylindrical structure with one end open, and the seal 33 is fixedly attached to the outer ring 3332 to be rotatable relative to the inner ring 3331.

Referring to fig. 6, the sealing cover 33 is integrally formed, and for convenience of understanding, the sealing cover 33 is divided into a receiving portion 337 and a sealing portion 336 which are connected in a front-back direction along an axial direction according to functional partitions of the sealing cover 33. The seal portion 336 has a seal surface that engages with the rear end surface of the mixer drum 2.

The accommodating portion 337 has a cylindrical structure, and a space enclosed therein constitutes an accommodating area in which the rear end of the agitating drum 2 can be accommodated.

Sealing 336 is used for sealing up the business turn over material mouth to churn 2, sealing 336 is discoid structure, sealing 336's rear end and outer lane 3332 form fixed connection, the mounting groove has been seted up backward to sealing 336's preceding terminal surface, the mounting groove is the ring form, be equipped with inner seal circle 304 in the mounting groove, when sealed lid 33 forward motion reaches the stroke terminal, inner seal circle 304 is extruded between churn 2's rear end terminal surface and sealing 336's preceding terminal surface, and all form the face contact between churn 2 and the sealing 336, realize the inner seal.

Referring to fig. 1 again, the rear end surface of the mixing drum 2 is provided with a connecting portion 21, the connecting portion 21 is a cylindrical structure with openings at the front and rear ends, and the outer diameter of the connecting portion 21 is smaller than the inner diameter of the accommodating portion 337, so that the connecting portion 21 can be accommodated in the accommodating area of the accommodating portion 337. The inside perisporium of portion 337 outwards extends and is formed with the annular, is equipped with outer seal ring 303 in the annular, and "O" shape sealing washer is chooseed for use to outer seal ring 303, and the part is located and holds the district, and when sealed lid 33 forward motion to stroke terminal, the periphery of connecting portion 21 is located to outer seal ring 303 cover, and it receives the extrusion of connecting portion 21 and portion 337, all forms the face contact between with connecting portion 21 and the portion 337, realizes the external seal.

The sealing mechanism of the seal assembly 3 in this embodiment is as follows: during transport, the location of easy penetration is at the junction of the connecting portion 21 and the sealing cap 33. When the mixing drum 2 rotates, the sealing cover 33 rotates along with the mixing drum 2, and static sealing surfaces are formed between the inner sealing ring 304 of the sealing part 336 and the rear end surface of the mixing drum 2 and between the outer sealing ring 303 and the connecting part 21, so that a good sealing effect is achieved. Even if the inner sealing ring 304 fails, so that the gap between the object sealing part 336 and the inner sealing ring 304 leaks, the outer sealing ring 303 can also seal the material for two times, thereby effectively isolating the material and effectively preventing the material from continuously permeating outwards.

In some embodiments, the rear end of the mixer truck is further equipped with a limiting ring 22, and the limiting ring 22 is located at the butt joint of the mixing drum 2 and the connecting portion 21, and can be fixed with the mixing drum 2 and the connecting portion 21 by welding, so as to connect the mixing drum 2, the connecting portion 21, and the limiting ring 22 together.

On the whole, the limiting ring 22 is of a circular ring-shaped structure, the outer diameter of the limiting ring is larger than that of the connecting portion 21, a predetermined distance is reserved between the limiting ring and the rear end face of the connecting portion 21, when the sealing cover 33 moves forwards to the stroke end, the front end face of the sealing cover 33 is just abutted to the rear end face of the limiting ring 22, excessive displacement of the sealing cover 33 is prevented, breakage of the sealing cover 33 caused by rigid impact between the sealing portion 336 and the connecting portion 21 is avoided, and therefore the sealing effectiveness of the sealing assembly 3 is guaranteed.

The sealing component 3 and the feed hopper 4 in the embodiment are both in transmission connection with the driving device and are driven by the driving device to perform corresponding actions.

Referring to fig. 2 and 3, the driving device comprises a support, a second driving mechanism and a first driving mechanism, the roll-over stand, the second driving mechanism and the first driving mechanism are all installed on the support, the sealing cover 33 is driven by the second driving mechanism and can move back and forth along the axial direction of the mixing drum 2 and can move over relative to the feeding hopper 4, and the feeding hopper 4 is driven by the first driving mechanism and can move back and forth along the axial direction of the mixing drum 2.

The support comprises two supporting beams 31, the two supporting beams 31 are respectively positioned at two sides of the mixing drum 2, the length direction of the supporting beams 31 is consistent with the axial direction of the mixing drum 2, the front end of each supporting beam 31 is positioned at the front side of a material inlet and outlet of the mixing drum 2, and the front end of each supporting beam 31 is connected with the frame 1 or the background 11 on the frame 1 through a connecting beam 32 and used for fixing the support on the frame 1.

The second drive mechanism comprises a second telescopic member 39, a second wheel axle 35 and a roll-over stand 38.

The axial direction of the second wheel shaft 35 is consistent with the width direction of the frame 1, the two ends of the second wheel shaft 35 in the axial direction are sleeved with the traveling wheels 36 which are rotatably connected with the second wheel shaft, and the traveling wheels 36 are supported by the support beam 31.

The second telescopic member 39 is in transmission connection with the second wheel shaft 35, and is used for driving the traveling wheels 36 on the second wheel shaft 35 to move along the length direction of the supporting beam 31. In this embodiment, the second telescopic member 39 is a hydraulic cylinder, a connecting beam (not labeled) is connected between the two supporting beams 31, the fixed end of the second telescopic member 39 is connected to the connecting beam, and the piston end of the second telescopic member 39 is hinged on the second wheel shaft 35.

The roll-over stand 38 is a frame structure formed by connecting a plurality of beams, in this embodiment, the roll-over stand 38 is a U-like structure formed by connecting 3 beams end to end, two ends of the roll-over stand 38 in the length direction are respectively and fixedly connected to two axial ends of the second wheel shaft 35, and the rotary support bears a beam support whose length direction is axially consistent with the second wheel shaft 35. Specifically, referring to fig. 4 and 5, a ball head 335 is connected to a beam whose length direction is axially consistent with the second axle 35, a ball head mounting seat 334 is sleeved outside the ball head 335, the ball head mounting seat 335 is fixedly connected to an inner ring 3332 of the slewing bearing, and the mounting modes of the ball head mounting seat 335 and the inner ring 3332 include, but are not limited to, bolt connection, welding and the like, and the bolt connection mode is preferred, so that the assembly, disassembly and maintenance are more convenient.

The angle of the sealing cover 33 can be adjusted through the ball head, so that the adverse effect caused by excessive jumping of the pot or excessive installation error in the rotation process of the pot is reduced, and the sealing effectiveness of the sealing cover 33 is guaranteed.

In this embodiment, the end of the roll-over stand 38 facing away from the second wheel axle 35 is also rotatably connected with the travelling wheels 36, that is, two travelling wheels 36 are also arranged on the roll-over stand 38. The second wheel shaft 35 in this embodiment can rotate relative to the supporting beam 31, and when the second wheel shaft 35 rotates to drive the roll-over stand 38 to turn over to be in a horizontal state, the two traveling wheels 36 on the roll-over stand 38 and the two traveling wheels of the second wheel shaft 35 are supported by the supporting beam 31, so that the roll-over stand 38 can move back and forth stably along the length direction of the supporting beam 31.

In a preferred embodiment, the second wheel shaft 35 is sleeved with a gear 371 at both axial ends, a rack 372 is fixedly connected to the support beam 31, the rack 372 extends along the length direction of the support beam 31, the rack 371 has a predetermined length, and after the gear 371 is separated from the front end of the rack 371, the axis of the sealing cover 33 is aligned with the axis of the mixing drum 2.

The second telescopic piece 39 can drive the second wheel shaft 35 to move back and forth along the length direction of the supporting beam 31, in the process that the second wheel shaft 35 moves forward, the gear 371 on the second wheel shaft 35 is meshed with the rack 372, so that the gear 372 drives the second wheel shaft 35 to rotate, the sealing cover 33 on the second wheel shaft 35 is driven to turn over forward, after the gear 371 is completely separated from the rack 372, the axis of the sealing cover 33 is exactly aligned with the axis of the mixing drum 2, and then the back and forth movement is continued along the length direction of the supporting beam 31 until the sealing cover 33 is abutted to the material inlet and outlet of the mixing drum 2 and forms rotary connection with the material inlet and outlet.

The sealing cover 33 can be driven to move back and forth and turn over along the axial direction through the second telescopic piece 39, the design concept of the mode is ingenious, the movement of two dimensions is realized through one power source, the whole device is compact in structure, the occupied space is small, and the production and manufacturing cost is saved.

The first drive mechanism includes a first axle 34 and a first telescoping member 30.

The first wheel shaft 34 is located below the second wheel shaft 35 and fixedly connected with the rear end of the feed hopper 4 through a support frame (and labeled), the first wheel shaft 34 is also connected with two traveling wheels 36 in an axial direction in a rotating manner, the two traveling wheels 36 of the first wheel shaft 34 are respectively installed in traveling grooves formed in the inner sides of the two support beams 31, and the length direction of the traveling grooves extends along the length direction of the support beams 31, so that the first wheel shaft 34 can move back and forth along the length direction of the support beams 31.

The first telescopic member 30 is in transmission connection with the feeding hopper 4 and is used for driving the feeding hopper 4 to move back and forth along the length direction of the supporting beam 31.

The working principle of the rear sealing device in this embodiment will be described in detail below.

In the driving process of the mixer truck, the sealing cover 33 is pressed on the material inlet and the material outlet of the mixing drum 2, the mixing drum 2 drives the sealing cover 33 to rotate relative to the slewing bearing, the mixing drum 2 is sealed in the feeding way through the sealing cover 33, and the materials in the mixing drum 2 are prevented from leaking outwards.

When the mixer is stopped to discharge materials or materials are input into the mixing drum 2, the sealing cover 33 and the feed hopper 4 are driven to move backwards through the second driving mechanism and the first driving mechanism respectively, and the feed and discharge openings of the mixing drum 2 are exposed. The second driving mechanism continues to drive the sealing cover 33 to move backwards, and when the gears 371 at the two ends of the second wheel shaft 35 are meshed with the rack 372, the second wheel shaft 35 drives the sealing cover 33 to turn backwards, so that the feeding hopper 4 can be just opposite to the feeding and discharging port of the mixing drum 2.

When the vehicle is stopped to unload materials, the mixing drum 2 is rotated, and the materials in the mixing drum 2 are output outwards under the action of the helical blades in the mixing drum 2, so that the discharging is realized.

When the feeding when stopping, the rethread first actuating mechanism drive drives feeder hopper 4 forward motion, makes the discharge end of feeder hopper 4 can stretch into in the churn 2 through the business turn over material mouth of churn 2 to the material can be through in feeder hopper 4 gets into churn 2, realizes the feeding.

When the discharging or feeding is finished, the first driving mechanism drives the feeding hopper 4 to move backwards,

the sealing cover 33 is driven by the second driving mechanism to move forwards, in the process, the gear 371 on the second wheel shaft 35 is meshed with the gear 372, so that the second wheel shaft 35 drives the sealing cover 33 to turn forwards, after the gear 371 is completely separated from the rack 372, the axis of the sealing cover 33 is just aligned with the axis of the stirring drum 2, and then the back and forth movement is continued along the length direction of the supporting beam 31 until the sealing cover 33 is abutted to the material inlet and outlet of the stirring drum 2 and forms rotary connection with the material inlet and outlet.

In conclusion, the rotary sealing mixer truck provided by the invention at least has the following advantages and positive effects:

the inner sealing ring 331 is in surface contact with the stirring cylinder 2 and the sealing part 336 to realize inner sealing; the outer sealing ring 303, the connecting part 21 and the accommodating part 337 form surface contact to realize outer sealing; the material can be effectively isolated through the inner and outer seals, and the material is effectively prevented from permeating outwards.

The inner sealing ring 304 and the outer sealing ring 303 rotate along with the rotation of the mixing drum 2, namely, the inner sealing ring 304 and the outer sealing ring 303 both adopt a static sealing mode, so that the wear is not easy to occur after the mixing drum is used for a long time, and the sealing performance is ensured.

The sealed 3 pressfitting of lid in the transportation is on the business turn over material mouth of churn 2, can effectively delay the moisture evaporation of concrete, reduces the moisture loss, has guaranteed the quality of concrete.

While the present invention has been described with reference to several exemplary embodiments, it is understood that the terminology used is intended to be in the nature of words of description and illustration, rather than of limitation. As the present invention may be embodied in several forms without departing from the spirit or essential characteristics thereof, it should also be understood that the above-described embodiments are not limited by any of the details of the foregoing description, but rather should be construed broadly within its spirit and scope as defined in the appended claims, and therefore all changes and modifications that fall within the meets and bounds of the claims, or equivalences of such meets and bounds are therefore intended to be embraced by the appended claims.

Claims

1. A rotary sealed mixer truck, comprising:

the frame is rotatably connected with a stirring drum;

2. The rotary sealed mixer truck of claim 1 wherein the seal assembly further comprises a rotary support, the rotary support including an outer race, an inner race rotatably connected within the outer race, and a body of revolution received between the outer race and the inner race, the outer race being fixedly connected to the seal cover, and the inner race being fixedly connected to the frame.

3. The rotary sealed mixer truck according to claim 2, wherein the sealing cover includes a receiving portion and a sealing portion which are connected to each other in the axial direction, a space enclosed by the receiving portion forms a receiving area, and a rear end portion of the mixing drum can be received in the receiving area; the preceding terminal surface of sealing portion extends backward and is formed with the mounting groove, be equipped with interior sealing washer in the mounting groove.

4. The rotary sealed mixer truck according to claim 3, wherein a connecting portion is attached to a rear end surface of the mixing drum, and the connecting portion is capable of being received in a receiving area of the receiving portion; the inner peripheral wall of the containing part extends outwards to form a ring groove, an outer sealing ring is assembled in the ring groove, and the outer sealing ring is partially located in the containing area.

5. The rotary sealed mixer truck according to claim 4 wherein the rear end of the mixer truck is further equipped with a limiting ring, the limiting ring being located at the interface of the mixing drum and the connecting portion.

6. The rotary sealed mixer truck according to claim 2, wherein the truck frame is fixedly connected with at least two support beams, the support beams are positioned on two sides of the material inlet and outlet of the mixing drum, the length direction of the support beams is parallel to the axial direction of the mixing drum, the second driving mechanism comprises a second telescopic part, a second wheel shaft and a roll-over stand, the second wheel shaft extends along the width direction of the truck frame, two axial ends of the second wheel shaft are rotatably connected with the traveling wheels, the traveling wheels are connected to the support beams in a rolling manner, the second telescopic part is used for driving the second wheel shaft to move back and forth along the axial direction of the mixing drum, and the roll-over stand is fixedly connected to the second wheel shaft and can rotate relative to the support beams.

7. The rotary sealed mixer truck according to claim 6, wherein gears are sleeved on two axial ends of the second wheel shaft, a rack is fixedly connected to the support beam, the rack extends along the length direction of the support beam, the rack has a predetermined length, and after the gears are separated from the front end of the rack, the axis of the sealing cover and the axis of the mixing drum are in the same straight line.

8. The rotary sealed mixer truck of claim 6 wherein the first drive mechanism includes a first telescoping member and a first axle extending widthwise of the truck frame and fixedly connected to the rear end of the hopper by a support bracket for fore and aft movement along the length of the support beam.

9. The rotary sealed mixer truck according to claim 6 wherein the roll-over stand is connected with a ball head, the ball head is sleeved with a ball head mounting seat, and the ball head mounting seat is fixedly connected with the inner ring of the rotary support.

10. The rotary sealing mixer truck of claim 6 wherein the front ends of the two support beams are fixedly connected to the rear frame of the truck frame by a connecting beam.