CN211137675U

CN211137675U - Mixer truck

Info

Publication number: CN211137675U
Application number: CN201921937094.XU
Authority: CN
Inventors: 陈威; 马业松; 杨瑞峰; 孙加龙
Original assignee: Wuhu CIMC Ruijiang Automobile Co Ltd
Current assignee: Wuhu CIMC Ruijiang Automobile Co Ltd
Priority date: 2019-11-08
Filing date: 2019-11-08
Publication date: 2020-07-31
Anticipated expiration: 2029-11-08

Abstract

The utility model provides a mixer truck, which comprises a truck frame, a mixing drum, a feeding and discharging device and a rotary sealing component; a material port is arranged at the rear end part of the stirring cylinder; the rotary sealing assembly comprises a fixed ring, a rotating ring and a sealing body; the fixed ring is fixedly connected with the feeding and discharging device; the fixing ring is internally provided with an axially extending mounting groove and at least one air inlet channel; the rotating ring is connected to the material port of the mixing drum and can rotate along with the mixing drum; the rotating ring extends into the fixed ring and is rotatably connected with 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 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. The utility model discloses a form that atmospheric pressure room adds the seal can effectively improve the sealing performance of the material mouth department of churn.

Description

Mixer truck

Technical Field

The utility model relates to a transport vechicle field, in particular to trucd mixer.

Background

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. And a sealing cavity for containing lubricating oil is formed among the flange gasket, the sealing gasket, the rotary bearing and the connecting plate.

In this stirring transport vechicle, the sealed mode that adopts sealed pad and lubricating oil in order to prevent revealing of concrete at the discharge gate department of churn, this kind of sealed mode is sealed for traditional mechanical seal adds oil, and wearing and tearing are very fast, and sealing reliability is poor, need frequently to pour into lubricating oil into to sealed chamber with the lubricating oil of make-up loss can guarantee sealed effect.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a mixer truck improves the sealing performance of churn discharge gate department.

In order to solve the technical problem, the utility model adopts the following technical scheme: a mixer truck comprises a truck frame, a mixing drum rotatably arranged on the truck frame, a feeding and discharging device fixed on the truck frame, and a rotary sealing assembly connected between the mixing drum and the feeding and discharging device; a material port is arranged at the rear end part of the stirring cylinder; the rotary sealing assembly comprises a fixed ring, a rotating ring and a sealing body; the fixed ring is fixedly connected with the feeding and discharging device; the air inlet channel is internally provided with an axially extending mounting groove and at least one air inlet channel communicated to the mounting groove from the periphery of the air inlet channel; the rotating ring is connected to the material port of the stirring cylinder and can rotate along with the stirring cylinder; the fixing ring extends into the mounting groove of the fixing ring and is rotatably connected with the fixing 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 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.

Optionally, the fixing ring comprises a receiving part and a first sealing part which are connected in a front-back manner; the mounting groove is formed from the front end surface of the accommodating part to the first sealing part, and a step is formed at the joint of the accommodating part and the first sealing part; the first sealing part is connected with the feeding and discharging device; the rotating ring comprises a rotating part and a second sealing part which extends backwards from the rear end surface of the rotating part; the rotating part is connected with the mixing drum and is rotatably connected with the accommodating part; the second sealing part and the first sealing part form the air pressure chamber and the sealing cavity; and a shaft shoulder is formed at the rear end face of the rotary part and is abutted against the step of the mounting groove.

Optionally, the first sealing portion includes an outer circumferential wall disposed circumferentially and an end wall disposed vertically at a rear end of the outer circumferential wall, and a front end of the outer circumferential wall is connected to the receiving portion; a mounting groove for accommodating the first sealing part is formed between the outer peripheral wall and the end wall; the outer peripheral wall is provided with the air inlet channel; the air pressure chamber is formed between the outer peripheral surface of the first seal portion and the outer peripheral wall.

Optionally, a ring groove is formed in the rear end face of the second sealing portion; the first sealing part is shielded at the periphery of the ring groove, and the sealing cavity is formed between the first sealing part and the ring groove.

Optionally, the annular groove and the inner circumferential surface and the outer circumferential surface of the second sealing part are provided with a gap therebetween; the end wall shields the opening of the annular groove to form the sealing cavity; the opening of the recess of the sealing body faces the end wall.

Optionally, the ring groove penetrates through an inner circumferential surface of the second sealing part; the first sealing part also comprises an inner peripheral wall vertically connected with the end wall, and the inner peripheral wall and the end wall jointly cover the annular groove to form the sealing cavity; the opening of the groove of the sealing body faces the bottom surface of the ring groove.

Alternatively, the seal cavity is formed between the outer peripheral surface of the second seal portion and the outer peripheral wall and the end wall, and is adjacent to the pneumatic chamber, and the opening of the groove of the seal body faces the end wall in the seal cavity.

Optionally, the rotary seal assembly further includes a spacer sleeve, the spacer sleeve is sealingly arranged between the outer periphery of the second sealing portion and the outer peripheral wall, and the spacer sleeve forms the air pressure chamber inside; the spacer bush is also in axial butt joint with the sealing body sleeved on the periphery of the second sealing part.

Optionally, the rotary seal assembly further comprises a seal ring, and the seal ring is sleeved on the periphery of the second seal portion and attached to the shaft shoulder.

Optionally, the sealing body is made of nitrile rubber, polyurethane rubber or fluororubber.

Optionally, the fixed ring and the feeding and discharging device, the fixed ring and the rotating ring, and the rotating ring and the mixing drum are detachably connected.

Optionally, the rotating ring is connected with the mixing drum through a connecting piece capable of deforming flexibly, one end of the connecting piece is arranged at the material opening in a surrounding mode and is detachably connected with the mixing drum, and the other end of the connecting piece is detachably connected with the front end face of the rotating ring.

According to the above technical scheme, the utility model discloses following advantage and positive effect have at least: the utility model discloses an among the trucd mixer, be connected through the rotary seal subassembly between churn material mouth and the device of input or output, the retainer plate of rotary seal subassembly adopts the mode formation that the atmospheric pressure room adds the seal to reliably seal with the rotation circle. The end face of the sealing body is provided with a groove, the peripheral wall of the inner side of the groove is inclined, when materials in the stirring cylinder permeate from the rotating ring to the outside, the groove can be conveniently and preferentially filled with the materials, and the materials are prevented from permeating into a gap between the rotating ring and the fixed ring; and the material produces the extrusion force to this seal after getting into in this recess for thereby this seal and the laminating degree in sealed chamber are strengthened and are played better sealed effect. In addition, the air pressure chamber can prevent water from permeating from a gap between the rotating ring and the fixing ring through the air pressure effect. In conclusion, the sealing performance of the material port of the mixing drum can be effectively improved through the form of adding the sealing body into the air pressure chamber.

Drawings

Fig. 1 is a schematic connection diagram of a mixing drum and a feeding and discharging device in the embodiment of the mixing truck of the present 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 cross-sectional structural view of the stationary ring and rotating ring engagement of the rotary seal assembly of FIG. 3.

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

Fig. 7 to 10 are schematic cross-sectional views of several other variations of the rotary seal assembly in the mixer truck of fig. 1.

The reference numerals are explained below:

1. a mixing drum; 11. a material port;

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. mounting holes; 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;

37. a spacer sleeve;

38. an intake valve;

4. a connecting member;

5. a fastener.

Detailed Description

Exemplary embodiments that embody features and advantages of the present invention will be described in detail in the following description. It is to be understood that the invention is capable of other and different embodiments and its several details are capable of modification without departing from the scope of the invention, and that the description and drawings are to be regarded as illustrative in nature and not as restrictive.

The utility model provides a mixer truck, it can be used to the stirring and the transportation of concrete. The mixer truck generally comprises a truck frame, a mixing drum rotatably mounted on the truck frame, a feeding and discharging device fixed on the truck frame, and a rotary sealing assembly connected between the mixing drum and the feeding and discharging device. The mixing drum is used for mixing concrete materials in the mixing drum through rotation relative to the frame, the feeding and discharging device is used for inputting raw materials into the mixing drum and outputting the mixed concrete in the mixing drum outwards, and the rotary sealing assembly is in rotary connection and sealing with the feeding and discharging device.

The embodiment of the utility model provides a mainly optimize to this rotary seal subassembly and rather than relevant connected mode, and frame, churn and business turn over material device's correlation structure can refer to correlation technique, and the churn can refer to correlation technique equally for the rotationally installation of frame and the mounting structure of business turn over material device and frame.

Referring to fig. 1, in the mixer truck of the present embodiment, a material outlet 11 is disposed at the rear end of the mixing drum 1, and the rotary seal assembly 3 is connected between the material outlet 11 of the mixing drum 1 and the feeding and discharging device 2.

Referring to fig. 2, preferably, the mixing drum 1 and the rotary seal assembly 3 are also connected by a flexibly deformable connecting member 4. The front end ring of the connecting piece 4 is arranged at the material opening 11 of the mixing drum 1 and is detachably connected with the mixing drum 1 through a fastening piece 5. The rear end of the connecting piece 4 is detachably connected with the rotary seal assembly 3 by a fastener 5. The cross-section at the middle part of this connecting piece 4 has the curve section and can flexible deformation for churn 1 and gyration seal assembly 3 form the flexonics, thereby can compensate the displacement change when 1 load of churn changes, make gyration seal assembly 3's gyration connect and sealed not receive the influence of 1 displacement of churn, ensured gyration seal assembly 3's sealing performance and gyration precision. The fastener 5 may be a bolt, a fixing pin, or the like.

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 has a generally annular structure, and an outer circumferential surface thereof is a cylindrical surface in which an axially extending mounting groove is formed, the mounting groove being stepped such that a step 3101 is formed on an inner circumferential surface of the fixing ring 31. The mounting groove is used for accommodating the rotating ring 32, and separated functional partitions are formed in the fixing ring 31 through a step-shaped structure of the mounting groove so as to respectively realize the functions of rotating connection and sealing.

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 mounting 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 its inner hole is opposite to the material port 11 of the mixing drum 1 for 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 mounting hole 305, which can be detachably connected and fixed with the feeding and discharging device 2 by a fastener 5.

Referring to fig. 2 to 5, the rotating ring 32 is connected to the material opening 11 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 through from front to back, and the through hole 324 is opposite to the material port 11 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 11.

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 face of the turning portion 321 is provided with a plurality of mounting holes 305 distributed circumferentially to be detachably connected and fixed with the connector 4 by the fastener 5 so as to be connected with the mixing drum 1.

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 utilizing the excellent performances of the materials, and has higher 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 11, 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 mounting 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.

Based on the above description, in the mixer truck of the present embodiment, the rotary connection and the rotary seal between the mixing drum 1 and the feeding and discharging device 2 are realized through the rotary seal assembly 3, and the reliable seal is formed by the air pressure chamber 301 and the seal body 35, and particularly, a better sealing effect is formed through the structural form of the seal body 35.

Based on this concept, the structure of the rotary seal assembly 3 relating to the sealing can be embodied in a number of different ways. Fig. 7 to fig. 10 schematically show the structures of four modifications, and the following mainly describes the modifications of the four modifications in detail.

The first modification is: as shown in fig. 7, this modified structure is obtained by adding a spacer 37 to the structure of fig. 3. The spacer 37 is sealingly disposed in an annular cavity between the outer periphery of the second sealing portion 322 and the outer peripheral wall 3121 of the first sealing portion 312, the spacer 37 has an inner annular groove 3221, an outer annular groove 3221, and a vent hole radially communicating the inner annular groove 3221 and the outer annular groove 3221, the outer annular groove 3221 is communicated with the air inlet passage 316 of the fixed ring 31, and the spacer 37 forms an air pressure chamber 301 therein. The spacer 37 axially abuts against the seal body 35 and the seal ring 36 in the ring cavity, and thereby the seal body 35 and the seal ring 36 can be axially limited.

The second modification is as follows: as shown in fig. 8, the main difference between the structure of this modification and the structure shown in fig. 3 is the position where the ring groove 3221 of the second sealing portion 322 is provided. With this structure, the annular groove 3221 is spaced apart from the outer and inner circumferential surfaces of the second sealing portion 322, i.e., the annular groove 3221 has only a rear end opening. And in response to this change, the first sealing portion 312 of the fixing ring 31 no longer has the inner circumferential wall 3123, and only the end wall 3122 shields the outside of the ring groove 3221 to form the inner sealing cavity 302. At this time, the groove 351 of the sealing body 35 housed in the inner sealing chamber 302 opens facing the end wall 3122. In this modification, the inner circumferential wall 3123 structure of the fixing ring 31 is omitted, and the thickness of the fixing ring 31 can be reduced, thereby reducing the self weight.

The third modification is as follows: as shown in fig. 9, compared with fig. 8, this modification eliminates the provision of the annular groove 3221 in the second seal portion 322, and accordingly, reduces the number of the seal bodies 35. The seal body 35 is provided only in the outer seal cavity 303 adjacent to the pneumatic chamber 301. In this manner, the thickness of the rotating ring 32 can be reduced, and the thickness of the fixed ring 31 can be further reduced, as compared with the structure shown in fig. 8, thereby reducing the self-weight to a greater extent.

A fourth modification: as shown in fig. 10, in this modification, as compared with fig. 9, the spacer 37 is added, and an air pressure chamber 301 is formed inside the spacer 37. The structure and arrangement of the spacer 37 may be the same as those shown in fig. 3, and will not be described in detail.

It will be appreciated that the actual arrangement is not limited to the ones illustrated above. In some embodiments, the outer sealed cavity 303 and the sealed body 35 therein may be omitted, and the inner sealed cavity 302 and the sealed body 35 therein are reserved; for another example, in the modification described above with reference to fig. 8, a spacer 37 may be added, and the inside of the spacer 37 forms the pneumatic chamber 301. Other ways of specifically deforming are not listed.

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 mixer truck comprises a truck frame, a mixing drum rotatably arranged on the truck frame, a feeding and discharging device fixed on the truck frame, and a rotary sealing assembly connected between the mixing drum and the feeding and discharging device; a material port is arranged at the rear end part of the stirring cylinder; characterized in that the rotary seal assembly comprises:

the fixed ring is fixedly connected with the feeding and discharging device; the air inlet channel is internally provided with an axially extending mounting groove and at least one air inlet channel communicated to the mounting groove from the periphery of the air inlet channel;

the rotating ring is connected to the material port of the stirring cylinder and can rotate along with the stirring cylinder; the fixing ring extends into the mounting groove of the fixing ring and is rotatably connected with the fixing 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 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.

2. The mixer truck of claim 1, wherein the retainer ring includes a receiving portion and a first sealing portion that are connected in tandem; the mounting groove is formed from the front end surface of the accommodating part to the first sealing part, and a step is formed at the joint of the accommodating part and the first sealing part; the first sealing part is connected with the feeding and discharging device;

the rotating ring comprises a rotating part and a second sealing part which extends backwards from the rear end surface of the rotating part; the rotating part is connected with the mixing drum and is rotatably connected with the accommodating part; the second sealing part and the first sealing part form the air pressure chamber and the sealing cavity; and a shaft shoulder is formed at the rear end face of the rotary part and is abutted against the step of the mounting groove.

3. The mixer truck according to claim 2, wherein the first sealing portion includes a peripheral wall disposed circumferentially and an end wall disposed perpendicularly to a rear end of the peripheral wall, a front end of the peripheral wall being contiguous with the receiving portion; a mounting groove for accommodating the first sealing part is formed between the outer peripheral wall and the end wall; the outer peripheral wall is provided with the air inlet channel; the air pressure chamber is formed between the outer peripheral surface of the first seal portion and the outer peripheral wall.

4. The mixer truck according to claim 3, wherein a ring groove is formed in a rear end surface of the second seal portion; the first sealing part is shielded at the periphery of the ring groove, and the sealing cavity is formed between the first sealing part and the ring groove.

5. The mixer truck according to claim 4, wherein the ring groove has a space between an inner circumferential surface and an outer circumferential surface of the second seal portion; the end wall shields the opening of the annular groove to form the sealing cavity; the opening of the recess of the sealing body faces the end wall.

6. The mixer truck according to claim 4, wherein the ring groove penetrates an inner peripheral surface of the second seal portion;

the first sealing part also comprises an inner peripheral wall vertically connected with the end wall, and the inner peripheral wall and the end wall jointly cover the annular groove to form the sealing cavity; the opening of the groove of the sealing body faces the bottom surface of the ring groove.

7. The mixer truck according to any one of claims 3 to 6, wherein the seal cavity is formed between the outer peripheral surface of the second seal portion and the outer peripheral wall and the end wall, and is adjacent to the gas pressure chamber, and in the seal cavity, the opening of the recess of the seal body faces the end wall.

8. The mixer truck of claim 7, wherein the rotary seal assembly further includes a spacer sealingly disposed between the outer periphery of the second seal portion and the outer peripheral wall, the spacer defining the plenum therein; the spacer bush is also in axial butt joint with the sealing body sleeved on the periphery of the second sealing part.

9. The mixer truck of claim 2, wherein the rotary seal assembly further includes a sealing ring disposed around the second seal portion and engaging the shoulder.

10. The mixer truck of claim 1, wherein the seal is a nitrile rubber material, a urethane rubber material, or a fluoroelastomer material.

11. The mixer truck according to claim 1, wherein the fixed ring is detachably connected with the feeding and discharging device, the fixed ring is detachably connected with the rotating ring, and the rotating ring is detachably connected with the mixing drum.

12. The mixer truck according to claim 11, wherein the rotating ring is connected to the mixing drum through a flexibly deformable connecting member, one end of the connecting member is annularly arranged at the material inlet and detachably connected to the mixing drum, and the other end of the connecting member is detachably connected to the front end face of the rotating ring.