阅读说明：本技术 搅拌车 (Mixer truck ) 是由 陈威 马业松 杨瑞峰 孙加龙 于 2019-11-08 设计创作，主要内容包括：本发明提供了一种搅拌车,包括车架、搅拌筒、进出料装置及连接件。搅拌筒可转动地安装在车架上；搅拌筒的一端具有料口；进出料装置固定在车架上,对应于料口设置；回转密封组件包括可转动连接的转动圈和固定圈；固定圈与进出料装置固定连接；转动圈呈环状,并对应于料口设置；连接件,其一端环设于搅拌筒的料口,另一端与转动圈连接,而使连接件及转动圈随搅拌筒的转动而一起转动；连接件具有可拉伸性,使搅拌筒与转动圈柔性连接。因此在搅拌筒因装载有物料而下沉时,连接件能够补偿下沉给搅拌筒所带来的位移,使得回转密封组件的回转连接以及密封不受搅拌筒位移的影响,保障了搅拌筒与回转密封组件之间的密封性能以及回转精度。(The invention provides a mixer truck which comprises a truck frame, a mixing drum, a feeding and discharging device and a connecting piece. The mixing drum is rotatably arranged on the frame; one end of the mixing drum is provided with a material port; the feeding and discharging device is fixed on the frame and arranged corresponding to the material port; the rotary sealing assembly comprises a rotating ring and a fixed ring which are rotatably connected; the fixed ring is fixedly connected with the feeding and discharging device; the rotating ring is annular and is arranged corresponding to the material port; one end of the connecting piece is arranged at the material port of the mixing drum, and the other end of the connecting piece is connected with the rotating ring, so that the connecting piece and the rotating ring rotate together with the rotation of the mixing drum; the connecting piece has stretchability, so that the mixing drum is flexibly connected with the rotating ring. Therefore, when the mixing drum sinks due to the fact that materials are loaded on the mixing drum, the connecting piece can compensate displacement brought to the mixing drum due to sinking, the rotary connection and the sealing of the rotary sealing assembly are not affected by the displacement of the mixing drum, and the sealing performance and the rotary precision between the mixing drum and the rotary sealing assembly are guaranteed.)

1. A mixer truck, comprising:

a frame;

the mixing drum is rotatably arranged on the frame; one end of the stirring cylinder is provided with a material port;

the feeding and discharging device is fixed on the frame and arranged corresponding to the material port;

the rotary sealing assembly comprises a rotary ring and a fixed ring which are rotatably connected; the fixed ring is fixedly connected with the feeding and discharging device; the rotating ring is annular and is arranged corresponding to the material port;

the connecting piece is arranged at the material port of the mixing drum in an end ring mode, and the other end of the connecting piece is connected with the rotating ring so that the connecting piece and the rotating ring rotate together along with the rotation of the mixing drum; the connecting piece has stretchability, so that the stirring cylinder is flexibly connected with the rotating ring.

2. The mixer truck of claim 1, wherein the coupler includes a transition junction and first and second junctions connected to opposite ends of the transition junction, respectively; the first connecting portion is connected with the mixing drum in a sealing mode, the second connecting portion is connected with the rotating ring in a sealing mode, and the section of the transition connecting portion is provided with a curve section.

3. The mixer truck of claim 2, wherein the curved segment includes one or more of an arc, a wave, or a sawtooth.

4. The mixer truck of claim 2, wherein the mixing drum includes a barrel and an end plate; one end of the cylinder body is provided with an opening; the end plate is annular and is connected to the opening of the cylinder body to form the material port;

the first connecting portion is annular, and the first connecting portion is attached to the end plate and is connected in a sealing mode.

5. The mixer truck according to claim 4, wherein an annular flange is further engaged with the other side of the first connecting portion opposite to the end plate, and a fastening member is inserted through the flange, the first connecting portion and the end plate to connect the connecting member to the mixing drum.

6. The mixer truck of claim 5, wherein a spacer is further disposed in the barrel, one end of the spacer is connected to the inner wall of the barrel, the other end of the spacer is connected to the end plate, an isolation cavity is formed among the barrel, the end plate and the spacer, and the end of the fastening member is located in the receiving cavity.

7. The mixer truck of claim 2, wherein the second connecting portion is annular, and is fitted and hermetically connected to an end of the rotating ring;

the other side of the second connecting part, which is opposite to the rotating ring, is attached with an annular flange, and a fastener penetrates through the flange, the second connecting part and the rotating ring to realize the connection of the connecting piece and the rotating ring.

8. The mixer truck of claim 1, wherein the connector is made of rubber, nitrile rubber or ethylene propylene diene monomer; the shore hardness of the connecting piece is 50-80 HA.

9. The mixer truck of claim 1, wherein the retainer ring defines an axially extending mounting groove therein and defines at least one air inlet passage communicating from an outer periphery thereof to the mounting groove;

the rotating ring extends into the mounting groove of the fixed ring; an air pressure chamber and a sealing cavity are formed between the rotating ring and the fixed ring; the air pressure chamber is communicated with the air inlet channel; the air pressure chamber and the sealing cavity both encircle the axis of the material port;

the rotary seal assembly further comprises a seal body; the sealing body is annular and is hermetically accommodated in the sealing cavity; a groove is annularly arranged on the end face of one end of the sealing body; the inner peripheral wall of the recess is inclined toward the center of the seal body in a direction toward the opening of the recess.

10. The mixer truck of claim 9, wherein a circumferential receiving cavity is formed between an outer circumferential surface of the rotating ring and an inner wall of the mounting groove, the receiving cavity having an opening at a side wall of the stationary ring;

the fixed ring and the rotating ring are rotatably connected through a transition unit; the transition unit comprises a fixed bracket and a plurality of rolling blocks; the fixed support is annular, a plurality of slots are formed in the fixed support at intervals in the circumferential direction, and the rolling block is clamped in the slots; the transition unit is arranged in the accommodating cavity, and the surface of the rolling block is in contact with the fixed ring and the rotating ring so that the rotating ring can rotate relative to the fixed ring;

the side wall of the fixed ring is detachably connected with a baffle; the baffle is blocked at the opening of the accommodating cavity to limit the axial displacement of the rolling block on the fixed ring.

Technical Field

The invention relates to the field of transport vehicles, in particular to a stirring vehicle.

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 chinese utility model patent CN205325993U discloses a mixing transport vehicle, which comprises a rolling type mixing drum, wherein the mixing drum comprises a drum body for accommodating materials and a discharge port arranged at one end of the drum body, and a material output control device is also arranged at the discharge port; a sealing component is arranged between the discharge hole and the material output control device; the sealing assembly comprises a flange, a rotary bearing, a supporting beam and a connecting plate; the flange is fixedly assembled on the discharge port and can rotate along with the rotation of the cylinder; the slewing bearing comprises a fixed element and a rotating element matched with the fixed element; the rotating element is fixedly arranged in the flange and keeps synchronous rotation with the flange, and the fixed element is matched on the rotating element and is positioned outside the flange. Through set up seal assembly between discharge gate and material output control device, flange, rotating element, sealed pad and flange gasket among the seal assembly are together along with the barrel rotates, and fixed element, connecting plate, a supporting beam keep fixed to it is fixed to keep material output control device, and sealed through sealed pad and flange gasket, thereby guarantee that the concrete can not flow from the discharge gate. The mixing drum needs to work under the condition of no-load and full-load variable load frequently, after materials are loaded, the mixing drum can sink to different degrees under the action of gravity of the materials, and the rotation center of the mixing drum deviates from the center of the sealing assembly, so that the defects of poor sealing effect and poor rotation precision are caused.

Disclosure of Invention

The invention aims to provide a mixer truck with good sealing effect and good rotation precision, and aims to solve the problems in the prior art.

In order to solve the above technical problem, the present invention provides a mixer truck, including: a frame; the mixing drum is rotatably arranged on the frame; one end of the stirring cylinder is provided with a material port; the feeding and discharging device is fixed on the frame and arranged corresponding to the material port; the rotary sealing assembly comprises a rotary ring and a fixed ring which are rotatably connected; the fixed ring is fixedly connected with the feeding and discharging device; the rotating ring is annular and is arranged corresponding to the material port; the connecting piece is arranged at the material port of the mixing drum in an end ring mode, and the other end of the connecting piece is connected with the rotating ring so that the connecting piece and the rotating ring rotate together along with the rotation of the mixing drum; the connecting piece has stretchability, so that the stirring cylinder is flexibly connected with the rotating ring.

In one embodiment, the connecting piece comprises a transition connecting part, and a first connecting part and a second connecting part which are respectively connected to two ends of the transition connecting part; the first connecting portion is connected with the mixing drum in a sealing mode, the second connecting portion is connected with the rotating ring in a sealing mode, and the section of the transition connecting portion is provided with a curve section.

In one embodiment, the curved section comprises one or more of an arc, a wave, or a sawtooth.

In one embodiment, the mixing drum comprises a drum body and an end plate; one end of the cylinder is provided with an opening, and the end plate is annular and is connected to the opening of the cylinder to form the material port; the first connecting portion is annular, and the first connecting portion is attached to the end plate and is connected in a sealing mode.

In one embodiment, an annular flange is attached to the other side of the first connecting portion opposite to the end plate, and a fastening member is inserted through the flange, the first connecting portion and the end plate to connect the connecting member and the mixing drum.

In one embodiment, a spacer is further arranged in the cylinder, one end of the spacer is connected with the inner wall of the cylinder, the other end of the spacer is connected with the end plate, an isolation cavity is formed among the cylinder, the end plate and the spacer, and the tail end of the fastener is located in the accommodating cavity.

In one embodiment, the second connecting part is annular and is attached to and hermetically connected with the end part of the rotating ring; the other side of the second connecting part, which is opposite to the rotating ring, is attached with an annular flange, and a fastener penetrates through the flange, the second connecting part and the rotating ring to realize the connection of the connecting piece and the rotating ring.

In one embodiment, the connecting piece is made of rubber, nitrile rubber or ethylene propylene diene monomer; the shore hardness of the connecting piece is 50-80 HA.

In one embodiment, an axially extending mounting groove is formed in the fixing ring, and at least one air inlet channel communicated to the mounting groove from the periphery of the fixing ring is formed in the fixing ring; the rotating ring extends into the mounting groove of the fixed ring; an air pressure chamber and a sealing cavity are formed between the rotating ring and the fixed ring; the air pressure chamber is communicated with the air inlet channel; the air pressure chamber and the sealing cavity both encircle the axis of the material port; the rotary seal assembly further comprises a seal body; the sealing body is annular and is hermetically accommodated in the sealing cavity; a groove is annularly arranged on the end face of one end of the sealing body; the inner peripheral wall of the recess is inclined toward the center of the seal body in a direction toward the opening of the recess.

In one embodiment, a circumferential accommodating cavity is formed between the outer annular surface of the rotating ring and the inner wall of the mounting groove, and the accommodating cavity is provided with an opening at the side wall of the fixing ring; the fixed ring and the rotating ring are rotatably connected through a transition unit; the transition unit comprises a fixed bracket and a plurality of rolling blocks; the fixed support is annular, a plurality of slots are formed in the fixed support at intervals in the circumferential direction, and the rolling block is clamped in the slots; the transition unit is arranged in the accommodating cavity, and the surface of the rolling block is in contact with the fixed ring and the rotating ring so that the rotating ring can rotate relative to the fixed ring; the side wall of the fixed ring is detachably connected with a baffle; the baffle is blocked at the opening of the accommodating cavity to limit the axial displacement of the rolling block on the fixed ring.

According to the technical scheme, the invention has the advantages and positive effects that:

the mixer truck comprises a truck frame, a mixing drum, a feeding and discharging device, a rotary sealing assembly and a connecting piece. One end of the connecting piece is arranged at the material port of the mixing drum in a surrounding mode, and the other end of the connecting piece is connected with the rotating ring of the rotary sealing assembly, so that the connecting piece and the rotating ring rotate together along with the rotation of the mixing drum. The connecting piece has stretchability, so that the mixing drum is flexibly connected with the rotating ring. Therefore, when the mixing drum sinks due to the fact that materials are loaded on the mixing drum, the connecting piece can compensate displacement brought to the mixing drum due to sinking, the rotary connection and the sealing of the rotary sealing assembly are not affected by the displacement of the mixing drum, and the sealing performance and the rotary precision between the mixing drum and the rotary sealing assembly are guaranteed.

Drawings

FIG. 1 is a schematic view of the connection between a mixing drum and a feeding and discharging device in the embodiment of the mixer truck of the invention.

Fig. 2 is a partially enlarged view of a portion a in fig. 1.

Fig. 3 is a schematic cross-sectional view of the rotary seal assembly of fig. 2.

Fig. 4 is a partially enlarged view of fig. 3 at B.

Fig. 5 is a schematic view of the fitting structure of the fixed ring and the rotating ring of the rotary seal assembly in fig. 3.

Fig. 6 is an exploded view of the transition unit of the rotary seal assembly of fig. 3.

FIG. 7 is a cross-sectional view of one embodiment of a connector.

Fig. 8 is a schematic cross-sectional view of another embodiment of a connector.

Wherein the reference numerals are as follows:

1. a mixing drum;

11. a barrel; 12. an end plate; 13. a spacer; 14. a material port; 15. an isolation chamber;

2. a feeding and discharging device;

3. a rotary seal assembly; 301. an air pressure chamber; 302. an inner sealed cavity; 303. an outer seal cavity; 305. an assembly hole; 307. an accommodating cavity; 308. an accommodating area;

31. a stationary ring; 311. a housing part; 312. a first seal portion; 3121. an outer peripheral wall; 3122. an end wall; 3123. an inner peripheral wall; 316. an air intake passage; 3101. a step;

32. rotating the ring; 321. a turning part; 3211. a shaft shoulder; 3213. a protrusion; 322. a second seal portion; 3221. a ring groove; 324. a through hole;

33. a transition unit; 331. fixing a bracket; 3311. grooving; 332. a rolling block;

34. a baffle plate;

35. a seal body; 351. a groove;

36. a seal ring;

38. an intake valve;

4. a connecting member;

41. a first connection portion; 42. a second connecting portion; 43. a transition connection;

5. a fastener.

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.

For further explanation of the principles and construction of the present invention, reference will now be made in detail to the preferred embodiments of the present invention, which are illustrated in the accompanying drawings.

The invention provides a mixer truck which can be used for mixing and transporting concrete. The mixer truck generally comprises a truck frame, a mixing drum 1 rotatably mounted on the truck frame, a feeding and discharging device 2 fixed on the truck frame, a rotary sealing component 3 positioned between the mixing drum 1 and the feeding and discharging device 2, and a connecting piece 4 for connecting and sealing the mixing drum 1 and the rotary sealing component 3.

The mixing drum 1 is used for mixing concrete materials in the mixing drum through rotation relative to a frame, the feeding and discharging device 2 is used for inputting raw materials into the mixing drum 1 and outputting the mixed concrete in the mixing drum 1 outwards, the rotary sealing component 3 is connected with the feeding and discharging device 2 and is sealed, the mixing drum 1 and the rotary sealing component 3 are connected and sealed through a flexible connecting piece 4, the connecting piece 4 can stretch to compensate displacement of the mixing drum 1 caused by settlement, and deviation between the rotary center of the mixing drum 1 and the center of the rotary sealing component 3 is reduced or eliminated, and sealing performance and rotary precision between the mixing drum 1 and the rotary sealing component 3 are guaranteed.

The embodiment of the invention mainly optimizes the connecting piece 4 and the related connecting mode thereof, the related structures of the frame and the feeding and discharging device 2 can refer to the related technology, and the mounting structures of the feeding and discharging device 2 and the frame can also refer to the related technology.

Referring to fig. 1 and fig. 2, in the mixer truck of this embodiment, a material opening 14 is provided at the rear end of the mixing drum 1, the material feeding and discharging device 2 is disposed corresponding to the material opening 14 of the mixing drum 1, the rotary seal assembly 3 is disposed corresponding to the material opening 14 of the mixing drum 1 and is fixedly connected to the material feeding and discharging device 2, and the mixing drum 1 and the rotary seal assembly 3 are connected to each other through a stretchable connecting member 4.

The mixing drum 1 includes a drum body 11, an end plate 12, and a spacer 13.

The rear end of the cylinder 11 is open. The front end and the rear end refer to the normal running direction of the concrete mixer with the front end of the cylinder 11 facing the normal running direction of the concrete mixer and the rear end deviating from the normal running direction of the concrete mixer with the use state of the concrete mixer as a reference.

The end plate 12 is annular and is annularly arranged at an opening at the rear end of the cylinder body 11, and the end plate 12 and the cylinder body 11 jointly form a material opening 14 of the stirring cylinder 1. The material opening 14 is used for feeding raw materials or discharging concrete materials. The agitating drum 1 is disposed such that the rotation center axis L thereof is inclined with respect to the horizontal line, and thus the material port 14 of the agitating drum 1 is opened obliquely upward.

The end plate 12 is provided with a plurality of first mounting holes at intervals along the circumferential direction thereof.

The spacer 13 is in the form of a circular truncated cone, and has a diameter that decreases gradually in the direction toward the end plate 12. One end of the isolation piece 13 is fixedly connected with the inner wall of the cylinder 11, and the other end is fixedly connected with the end plate 12, so that the isolation piece 13, the cylinder 11 and the end plate 12 enclose to form an isolation cavity 15.

The rotatable mounting of the mixing drum 1 relative to the frame is not described in detail herein, as reference is made to the related art.

Referring to fig. 2 and 3, the rotary seal assembly 3 mainly includes a fixed ring 31, a rotating ring 32 rotatably connected to the fixed ring 31, and a sealing body 35 sealingly accommodated between the fixed ring 31 and the rotating ring 32. Wherein the fixed ring 31 and the rotating ring 32 are rotatably connected by a transition unit 33. In this embodiment, the rotary seal assembly 3 further comprises a seal ring 36.

Referring to fig. 3 and 5, the fixing ring 31 is generally annular in structure, and has a cylindrical outer peripheral surface, and an axially extending mounting groove is formed therein, and the mounting groove is shaped like a step 3101 such that the step 3101 is formed on the inner peripheral surface of the fixing ring 31. The mounting groove is used for accommodating the rotating ring 32, and separated functional partitions are formed inside the fixed ring 31 through a step 3101-shaped structure of the mounting groove, so that the rotating connection and the sealing function are realized respectively.

The fixing ring 31 is integrally formed, and for convenience of understanding, the fixing ring 31 is divided into a receiving portion 311 and a first sealing portion 312 which are connected in the front-rear direction along the axial direction according to the functional division of the fixing ring 31. The receiving portion 311 and the first sealing portion 312 are demarcated by a step 3101 of a mounting groove, the mounting groove is opened from the front end surface of the receiving portion 311 to the first sealing portion 312, a portion of the mounting groove located in the receiving portion 311 constitutes a mounting region, a portion located in the first sealing portion 312 constitutes a sealing region, the diameter of the mounting region is larger than that of the sealing region, the step 3101 of the mounting groove is located at the contact position of the receiving portion 311 and the first sealing portion 312, and the mounting groove is not penetrated through the rear end surface of the first sealing portion 312.

The receiving portion 311 is used for forming a rotational connection with the rotating ring 32, and the receiving portion 311 is cylindrical, and a space enclosed therein constitutes an installation area of the installation groove. A plurality of attachment holes 305 are circumferentially distributed on the front end surface of the receiving portion 311.

The first sealing portion 312 includes an outer circumferential wall 3121 disposed circumferentially and an end wall 3122 disposed perpendicularly to a rear end of the outer circumferential wall 3121, and an inner circumferential wall 3123 perpendicularly connected to the end wall 3122 is preferably further provided in this embodiment. The space enclosed among the outer peripheral wall 3121, the end wall 3122, and the inner peripheral wall 3123 constitutes the sealing area of the mounting groove.

The outer peripheral wall 3121 has a cylindrical structure, the tip end of which is in contact with the receiving portion 311, and the thickness of the outer peripheral wall 3121 is larger than that of the receiving portion 311, thereby forming a step 3101 of the mounting groove. The end wall 3122 is substantially circular and has an inner hole opposite to the material port 14 of the mixing drum 1 for the material to enter and exit. The inner circumferential wall 3123 is cylindrical and extends forward from the inner end of the end wall 3122, and the axial length of the inner circumferential wall 3123 is smaller than the axial length of the outer circumferential wall 3121.

At least one air inlet passage 316 is formed in the outer circumferential wall 3121 along the circumferential direction thereof, and the air inlet passage 316 is communicated from the outer circumferential surface of the outer circumferential wall 3121 to the installation groove therein. The air inlet passage 316 may preferably extend directly in the radial direction of the outer peripheral wall 3121, and has a short path, but is not limited thereto. The outer end of the intake passage 316 may be provided with an intake valve 38 to control intake.

The rear end face of the peripheral wall 3121 is provided with a fitting hole 305, which can be detachably connected and fixed with the feeding and discharging device 2 by a fastener 5. The fastener 5 may be a bolt, a fixing pin, or the like.

Referring to fig. 2 to 5, the rotating ring 32 is connected to the material opening 14 of the mixing drum 1 and can rotate along with the mixing drum 1. The rotating ring 32 extends into the mounting groove of the fixing ring 31 and is rotatably connected with the fixing ring 31. The middle part of the rotating ring 32 is provided with a through hole 324 which is penetrated through from front to back, and the through hole 324 is opposite to the material port 14 of the mixing drum 1 for the material to enter and exit. The axis of the rotating ring 32 substantially coincides with the axis of the spout 14.

The rotating ring 32 is also integrally constructed, and the rotating ring 32 can be divided into a turning portion 321 and a second sealing portion 322 protruding rearward from a rear end surface of the turning portion 321, depending on functions at different portions when it is engaged with the fixing ring 31. The rotary part 321 and the second sealing part 322 are both cylindrical in shape, the diameter of the rotary part 321 is larger than that of the second sealing part 322, the joint of the rotary part 321 and the second sealing part 322 is stepped, and a shaft shoulder 3211 is formed at the rear end face of the rotary part 321.

The front end surface of the turning portion 321 is provided with a plurality of first mounting holes distributed circumferentially.

The turning portion 321 is received in the receiving portion 311 of the fixing ring 31, i.e., a mounting region of the mounting groove. The shoulder 3211 of the rotary part 321 abuts against the step 3101 of the mounting groove to form an axial limit at the rear end. A circumferential accommodation chamber 307 is formed between the outer circumferential surface of the turning portion 321 and the inner circumferential surface of the accommodation portion 311, and the front end of the accommodation chamber 307 is open. The receiving cavity 307 is configured to receive the transition unit 33, so that the rotating ring 32 can rotate relative to the fixed ring 31 through the transition unit 33.

In this embodiment, a protrusion 3213 protrudes from the outer circumference of the rear end of the rotating portion 321, and a circumferential gap exists between the protrusion 3213 and the inner circumferential surface of the receiving portion 311 to form an annular receiving area 308. The rear end surface of the projection 3213 also abuts the step 3101 of the mounting groove.

The second sealing portion 322 is received in the first sealing portion 312 of the fixing ring 31, i.e., the sealing region of the mounting groove. The outer peripheral surface of the second seal portion 322 faces the outer peripheral wall 3121 of the first seal portion 312 at a distance, and the rear end surface of the second seal portion 322 faces the end wall 3122 of the first seal portion 312.

The outer peripheral surface of the second sealing portion 322, the rear end surface of the turning portion 321, the outer peripheral wall 3121 of the first sealing portion 312 and the end wall 3122 are enclosed to form an annular chamber surrounding the axis of the rotating ring 32. In the axial direction, the middle part of the annular cavity forms an air pressure chamber 301, the air pressure chamber 301 is communicated with the air inlet channel 316, and the air pressure chamber 301 can prevent the water from permeating through the air pressure effect in the air pressure chamber. The rear portion adjacent to the pneumatic chamber 301 forms a sealed chamber for accommodating the sealing body 35, which is located at the outer periphery of the second sealing portion 322 and is referred to as an outer sealed chamber 303. The front portion adjacent to the pneumatic chamber 301 is adapted to receive the sealing ring 36.

An annular groove 3221 is opened in a rear end surface of the second sealing portion 322, the annular groove 3221 penetrates through an inner circumferential surface of the second sealing portion 322 inward, an inner opening of the annular groove 3221 is blocked by an inner circumferential wall 3123 of the first sealing portion 312, and a rear end opening of the annular groove 3221 is blocked by an end wall 3122 of the first sealing portion 312. A seal cavity for accommodating the seal body 35 is formed between the second seal portion 322 and the first seal portion 312, i.e., at the ring groove 3221, and is located at the inner periphery of the second seal portion 322, which is referred to as an inner seal cavity 302.

Referring to fig. 3 and 4, the sealing body 35 is annular, and a groove 351 is annularly provided on an end surface of one end of the sealing body, and an inner peripheral wall of the groove 351 is inclined toward a center of the sealing body 35 in a direction in which the groove 351 opens. The cross section of the groove 351 is in a right trapezoid shape, the oblique waist of the right trapezoid corresponds to the inner peripheral wall of the groove 351, and the lower bottom edge of the right trapezoid corresponds to the opening of the groove 351.

The sealing body 35 may be made of nitrile rubber, urethane rubber, or fluororubber. The nitrile rubber has the advantages of excellent oil resistance, high wear resistance, high heat resistance, high bonding force, high water resistance, high air tightness and high bonding performance. The polyurethane rubber (polyurethane rubber) has the advantages of high hardness, good strength, high elasticity, high wear resistance, tear resistance, aging resistance, ozone resistance, radiation resistance, good conductivity and the like. The fluororubber has excellent heat resistance, oxidation resistance, oil resistance, corrosion resistance and atmospheric aging resistance. The sealing body 35 can be matched with the application condition of the mixer truck by adopting the excellent performances of the materials, and can have a longer service life and higher use reliability while meeting the sealing performance.

With reference to fig. 2 to 5, in the present embodiment, the inner sealing cavity 302 sealingly accommodates a sealing body 35, the opening of the groove 351 of the sealing body 35 faces the bottom surface of the ring groove 3221, and the sealing body 35 in the inner sealing cavity 302 forms a first seal. The outer sealing chamber 303 sealingly accommodates a sealing body 35, the groove 351 of the sealing body 35 opens towards the end wall 3122, and the sealing body 35 in the outer sealing chamber 303 forms a second seal.

The mechanism of action of the seal 35 is: the concrete in the mixing drum 1 is discharged from the material inlet 14, and then is sequentially output to the feeding and discharging device 2 along the through hole 324 of the rotating ring 32 and the inner hole of the end wall 3122 of the fixed ring 31, and the position where leakage is easy is the rear end of the second sealing portion 322 of the rotating ring 32. When concrete leaks along the rear end of the second sealing portion 322, there are two cases: 1. when the concrete penetrates into the gap between the sealing body 35 and the annular groove 3221, the concrete can play a role in bonding and blocking after solidification, and the concrete is prevented from further penetrating into the gap between the rotating ring 32 and the fixing ring 31; 2. when the concrete is inserted into the groove 351 of the sealing body 35, the structure of the sealing body 35 at the outer peripheral side portion of the groove 351 is turned over in the direction indicated by the arrow marked inside the groove 351 in fig. 4 due to the squeezing action of the concrete, and the degree of adhesion of the sealing body 35 to the sealing cavity can be enhanced, thereby enhancing the sealing effect.

The opening of the groove 351 of the sealing body 35 in the inner sealing cavity 302 and the opening of the groove 351 of the sealing body 35 in the outer sealing cavity 303 are both towards the incoming material direction of the material leakage, and the material leakage preferably enters the groove 351 of the sealing body 35, so that the further leakage is prevented. The inclined structure of the peripheral wall of the inner side of the groove 351 can guide leaked materials, and the materials can enter the groove 351 conveniently.

Referring to fig. 3, the sealing ring 36 is also annular, has a square cross section, and is sealingly sleeved on the outer periphery of the second sealing portion 322 and attached to the shoulder 3211. The sealing ring 36 further isolates the mounting area from the sealing area so that the rotary connection and the sealing can each exert a better effect. At the same time, the sealing ring 36 also serves as a third seal to further prevent leaked materials from entering the installation area and affecting the relative rotation between the rotating ring 32 and the fixed ring 31.

The seal ring 36 may be a slinger, such that when grease is used in the mounting area to reduce rotational resistance, the seal ring 36 prevents grease from entering the sealing area. The sealing ring 36 may also be made of asbestos packing to achieve a sealing effect.

Referring to fig. 6, the transition unit 33 includes a fixed bracket 331 and a plurality of rolling blocks 332. Wherein the fixing bracket 331 is ring-shaped. The fixed bracket 331 has a plurality of slots 3311 formed at intervals along the circumference thereof to form a tooth-like structure at the periphery of the fixed bracket 331. The slot 3311 extends in the axial direction of the fixing bracket 331.

Referring also to fig. 3, the transition unit 33 is installed between the rotating ring 32 and the fixed ring 31. The fixing bracket 331 is disposed in the accommodating area 308 formed between the protrusion 3213 of the rotating ring 32 and the inner wall of the accommodating portion 311 of the fixing ring 31. The plurality of rolling blocks 332 are engaged with the slots 3311 of the fixing bracket 331 in a one-to-one correspondence, so that the surfaces of the rolling blocks 332 contact with the inner wall of the accommodating cavity 307, that is, the outer peripheral surface of the turning portion 321 of the rotating ring 32 and the inner wall of the accommodating portion 311 of the fixing ring 31, to realize the relative rotation of the rotating ring 32 and the fixing ring 31. The cross section of the roller block 332 is preferably polygonal, so as to form surface contact with both the revolving portion 321 and the receiving portion 311, thereby improving the smoothness of the rotational connection. The roller block 332 is made of a self-lubricating wear-resistant material. The self-lubricating wear-resistant material can be polytetrafluoroethylene, polycarbonate or nylon and the like. In addition, the rolling block 332 may be made of a high wear-resistant metal material, such as copper.

The front side of the transition unit 33 is stopped by a stop plate 34. The baffle 34 is fixed at the assembling hole 305 of the front end face of the fixed ring 31 by the fastener 5, and the baffle 34 is partially stopped at the opening of the accommodating cavity 307 to prevent the rolling block 332 from being pulled out. The baffle 34 cooperates with the protrusion 3213 of the revolving portion 321 to form axial limit on the rolling block 332, so as to avoid the separation of the rolling ring 32 and the fixed ring 31 during relative rotation, and ensure the stability of relative rotation between the fixed ring 31 and the rolling ring 32.

In this embodiment, the fixing ring 31 of the rotary seal assembly 3 is detachably connected with the feeding and discharging device 2 through the fastening member 5, the rotating ring 32 is detachably connected with the connecting member 4, which is equivalent to that the rotating ring 32 is also detachably connected with the mixing drum 1, and in addition, the baffle 34 is also detachably connected with the fixing ring 31. If any one of the components of the rotary sealing component 3 is worn or damaged, the rotary sealing component can be adaptively disassembled and repaired and replaced correspondingly, and compared with the integral replacement of the rotary sealing component 3, the structure of the embodiment can greatly reduce the repair and update cost.

According to the mixer truck, the rotary connection and the rotary sealing between the mixing drum 1 and the feeding and discharging device 2 are realized through the rotary sealing component 3, the reliable sealing is formed by the air pressure chamber 301 and the sealing body 35, and particularly, a better sealing effect is formed through the structural form of the sealing body 35.

Referring to fig. 2 again, the connecting member 4 is located between the material opening 14 of the mixing drum 1 and the rotary seal assembly 3, and is used for connecting the mixing drum 1 and the rotary seal assembly 3. Specifically, one end of the connecting element 4 is arranged around the material opening 14 of the mixing drum 1, and the other end is connected with the rotating ring 32, so that the connecting element 4 and the rotating ring 32 rotate together with the rotation of the mixing drum 1.

The connecting element 4 is stretchable so as to provide a flexible connection between the mixing drum 1 and the rotating ring 32, which allows axial expansion, contraction and a certain displacement between the mixing drum 1 and the rotating ring 32 in a direction perpendicular to the axial direction. Therefore, when different degrees of subsidence appear under the action of gravity of concrete after concrete is loaded in the mixing drum 1, the connecting piece 4 can compensate the displacement brought to the mixing drum 1 by subsidence, so that the rotary connection and the sealing of the rotary sealing component 3 are not influenced by the displacement of the mixing drum 1, and the sealing performance and the rotary precision between the mixing drum 1 and the rotary sealing component 3 are ensured. And when the material opening 14 of the mixing drum 1 deforms after the mixing drum 1 is loaded with concrete, the connecting piece 4 can stretch along with the deformation of the material opening 14 of the mixing drum 1, so that the sealing connection between the mixing drum 1 and the connecting piece 4 is ensured, and the influence of the deformation on the rotating ring 32 is reduced.

Meanwhile, the stretchability of the connecting piece 4 can also compensate the relative displacement between the mixing drum 1 and the frame, absorb the interaction force between the mixing drum and the frame, transmit the rotation torque, further reduce the stress of the rotating ring 32 in the rotary sealing component 3, and prolong the service life of the rotating ring 32.

The connecting piece 4 can be made of rubber, nitrile rubber or ethylene propylene diene monomer. In this embodiment, the shore hardness of the rubber, the nitrile rubber, and the ethylene propylene diene monomer is 50-80HA, so that the connecting member 4 not only HAs a certain degree of stretchability to meet requirements for compensating displacement and the like, but also HAs a certain degree of toughness to meet requirements for connection strength.

In other embodiments, the toughness of the rubber, the nitrile rubber or the ethylene propylene diene rubber may be increased by modifying, for example, carbon black or glass fiber is filled in the rubber, the nitrile rubber or the ethylene propylene diene rubber.

In another embodiment, the material of the connecting member 4 may also be an elastic plastic with a toughening agent.

Further, the connection member 4 has a curved section when the elongation of the connection member 4 is less than 50%. The displacement of the mixing drum 1 caused by the sedimentation is further compensated by the curve section.

Specifically, in the present embodiment, the connecting member 4 is integrally formed, and according to the functional division, the connecting member 4 includes a first connecting portion 41, a second connecting portion 42, and a transition connecting portion 43 connecting the first connecting portion 41 and the second connecting portion 42.

The first connection portion 41 has a ring shape. A plurality of first assembly holes are provided at intervals in the circumferential direction of the first connection portion 41. The first plurality of assembly holes are disposed to correspond to the first plurality of mounting holes on the end plate 12.

The connecting piece 4 and the mixing drum 1 are connected in a sealing mode and in a detachable mode through the first flange. Specifically, first flange is cyclic annular, and along the circumference of first flange, the interval sets up a plurality of first connecting holes. When the connecting piece 4 is connected with the mixing drum 1, the first connecting part 41 is attached to the end plate 12, the first assembly hole is opposite to the first mounting hole, the first flange is attached to the first connecting part 41, the first connecting hole is opposite to the first assembly hole and the first mounting hole, the fastener 5 penetrates through the first connecting part, and the connecting piece 4 is connected with the mixing drum 1 in a sealing mode and can be detachably connected.

And the tail end of the fastening piece 5 is positioned in the isolation cavity 15 of the mixing drum 1, so that the sealing property between the mixing drum 1 and the connecting piece 4 is ensured.

The second connection portion 42 has a ring shape. A plurality of second assembly holes are provided at intervals in the circumferential direction of the second connection portion 42. The second plurality of assembly holes are disposed to correspond to the second plurality of mounting holes on the end plate 12. In the present embodiment, the second connection portions 42 are spaced apart from and parallel to the first connection portions 41.

The connecting piece 4 and the rotating ring 32 are connected in a sealing way and detachably through a second flange. Specifically, the second flange is annular, and along the circumference of second flange, the interval sets up a plurality of second connecting holes. When the connecting piece 4 is connected with the rotating ring 32, the second connecting part 42 is attached to the front end face of the rotating part 321 of the rotating ring 32, the second assembling hole is opposite to the second mounting hole, the second flange is attached to the second connecting part 42, the second connecting hole is opposite to the second assembling hole and the second mounting hole, and the fastening piece 5 penetrates through the second connecting hole, so that the connecting piece 4 is connected with the rotating ring 32 in a sealing manner and can be detachably connected.

The transition connection 43 has a curved section. In particular, the curvilinear segments comprise one or more of an arc, a wave, or a sawtooth shape. Referring to fig. 7, the curved segment includes an arc. Referring to fig. 8, the curved segment includes a wave. In other embodiments, the curved segment may also comprise a plurality of arcs, a plurality of waves, a combination of arcs and waves, or a combination of arcs and zigzags.

This connecting piece 4 not only is the flexonics through the combination of structure and material between messenger's churn 1 and the circle 32 that rotates, and still has the curve section, and when making churn 1 bring the displacement because of subsiding, through the common compensation displacement of flexonics and curve section, makes the gyration of rotary seal subassembly 3 connect and sealed not receive the influence of churn 1 displacement.

According to the technical scheme, the invention has the advantages and positive effects that:

the mixer truck comprises a truck frame, a mixing drum, a feeding and discharging device, a rotary sealing assembly and a connecting piece. One end of the connecting piece is arranged at the material port of the mixing drum in a surrounding mode, and the other end of the connecting piece is connected with the rotating ring of the rotary sealing assembly, so that the connecting piece and the rotating ring rotate together along with the rotation of the mixing drum. The connecting piece has stretchability, so that the mixing drum is flexibly connected with the rotating ring. Therefore, when the mixing drum sinks due to the fact that materials are loaded on the mixing drum, the connecting piece can compensate displacement brought to the mixing drum due to sinking, the rotary connection and the sealing of the rotary sealing assembly are not affected by the displacement of the mixing drum, and the sealing performance and the rotary precision between the mixing drum and the rotary sealing assembly are guaranteed.

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, as follows: it is therefore intended to cover in the appended claims all such changes and modifications that are within the scope of the claims and equivalents thereof.