A follow-up self-compensating concrete mixer truck tail cover sealing device and implementation method

Abstract

A follow-up self-compensating concrete mixer truck tail cover sealing device and implementation method belong to the technical field of concrete mixer truck tail cover sealing devices. This device adopts an integrated rotary connection device design scheme. Through the design of a follow-up rotary connection device, the flexible connection and sealing function between the rotary connection device and the tail cover plate are realized. Through self-compensating sealing design, the sealing element and the inner ring end face are always kept in a good fitting state during operation, and the sealing requirements at different gap positions are realized through the elastic deformation of the sealing element. This device can effectively avoid the abnormal stress and wear of parts caused by the load deformation of the mixing drum, greatly improve the service life of the overall device, and effectively improve the reliability of the tail cover sealing device during operation.

Description

Technical Field

[0001] The invention relates to the technical field of concrete mixer truck tail cover sealing devices, in particular to a follow-up self-compensating concrete mixer truck tail cover sealing device and an implementation method thereof. Background Art

[0002] As my country continues to increase its investment in municipal infrastructure, the market demand for concrete mixer trucks continues to expand. The application scope of mixer trucks is no longer limited to remote construction sites in the wild, but more and more often appears in urban construction sites. However, the problem of urban road pollution caused by concrete mixer trucks is also becoming increasingly prominent. The outlet of the mixing drum of traditional concrete mixer trucks is mostly open, and the vehicle often leaks materials due to vibration and bumps during driving, causing road pollution.

[0003] In order to solve the problem of concrete leakage during transportation, translational opening and closing tail covers, partially open tail covers, side opening tail covers, etc. are generally used. Some of these tail cover devices adopt hollow shaft slewing bearing sealing solutions, some adopt sleeve sealing solutions with rotating inner ring of the sealing door and stationary outer ring, or combined sealing solutions, etc. These design solutions have alleviated the problem of concrete leakage to a certain extent and played a positive role in cleaning and environmental protection. However, they also bring many problems, such as: loose sealing, large maintenance, many wearing parts, and high replacement costs. Summary of the invention

[0004] The purpose of the present invention is to solve the deficiencies in the prior art, and therefore a follow-up self-compensating concrete mixer truck tail cover sealing device and an implementation method are proposed.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A follow-up self-compensating concrete mixer tail cover sealing device, comprising a chassis, a mixing drum, a feed hopper, a slewing bearing sealing assembly, a follow-up hinge device, a tail cover sealing assembly and an opening and closing drive device, wherein the mixing drum is mounted on the chassis through a slewing bearing, the follow-up hinge device is rotatably connected to the chassis, the slewing bearing sealing assembly comprises a flange, an inner ring, an outer ring, a first seal, a second seal and a third seal, the flange is fixedly connected to the tail of the mixing drum, the outer ring is fixedly connected to the flange by bolts, the first seal is fixedly mounted on a side of the inner ring opposite to the flange and is connected to the flange The second seal and the third seal are both fixedly mounted on the inner ring to block the gap between the inner ring and the outer ring. The tail cover sealing assembly comprises a tail cover plate, a seal and an elastic connector. The tail cover plate is fixedly connected to the follower hinge device and the feed hopper. The seal is fixedly mounted on the side of the tail cover plate facing the inner ring. One end of the opening and closing drive device is rotatably mounted on the chassis and the other end is rotatably connected to the feed hopper. The tail cover plate makes the seal fit or separate from the outer end surface of the inner ring under the action of the opening and closing drive device. The elastic connector is mounted on the tail cover plate and is axially movably connected to the inner ring.

[0007] Further preferably, the thickness of the first seal on the side opposite to the flange gradually decreases in the direction away from the inner ring, and the first seal gradually inclines toward the center of the mixing drum in the direction away from the inner ring.

[0008] Further preferably, an arc-shaped slot is provided on the flange, and the arc-shaped slot is located at the top of the connecting surface between the flange and the outer ring.

[0009] Further preferably, a pin hole for installing an elastic connector is provided on the tail cover plate, and a limiting groove adapted to the elastic connector is provided on the outer end surface of the inner ring.

[0010] Further preferably, the elastic connecting member includes a fixing portion, a mounting portion and a reset portion, the fixing portion is adapted to the limiting groove, the mounting portion is movably mounted inside the pin hole and fixedly connected to the fixing portion, and the reset portion is sleeved on the outer side of the mounting portion between the fixing portion and the tail cover plate.

[0011] Further preferably, a guide plate is fixedly connected to the outer end surface of the inner ring.

[0012] Further preferably, the follower hinge device includes a crossbeam, a U-shaped bolt, a nut, a hinge seat, a hinge pin and a connecting ear, the crossbeam is fixedly connected to the chassis, the hinge seat is provided with a connecting hole, the U-shaped bolt is sleeved on the crossbeam and passes through the connecting hole and is threadedly connected to the nut, the hinge pin is rotatably connected to the hinge seat and rotatably connected to the connecting ear, and the connecting ear is fixedly connected to the tail cover plate.

[0013] Further preferably, the opening and closing drive device includes a base one, a base two and a drive member, the base one is fixedly mounted on the chassis, the base two is fixedly connected to the feed hopper, and both ends of the drive member are rotatably connected to the base one and the base two respectively.

[0014] The present invention also discloses an implementation method of a follow-up self-compensating concrete mixer truck tail cover sealing device, comprising the following steps:

[0015] A. During feeding and road transportation, the tail cover plate is indirectly acted upon by the driving member to keep the tail of the mixing drum in a closed state; at this time, the outer ring rotates together with the flange and the mixing drum, and the fixed part of the elastic connector moves into the limit groove on the inner ring under the action of the reset part, and the fixed part and the inner ring remain stationary after being constrained by the tail cover plate; at the same time, the seal fits tightly with the outer end surface of the inner ring, and no relative sliding wear occurs; the first seal, the second seal and the third seal are all in the dynamic sealing working mode, and together with the seal, the material is prevented from leaking from the tail of the mixing drum;

[0016] B. By continuously feeding materials into the mixing drum, the mixing drum is deformed under load, and the outer ring moves with the mixing drum. At this time, a gap appears between the seal and the outer end face of the inner ring. The tail cover plate swings slightly under the action of the opening and closing drive device, so that the seal and the outer end face of the inner ring remain in a close fit;

[0017] C. When the material reaches the target location for unloading, the opening and closing drive device drives the seal and the elastic connector to swing toward the rear side of the mixing drum together with the tail cover plate, and the seal and the elastic connector are separated from the outer end surface of the inner ring. Under the internal friction force, the inner ring and the outer ring rotate together with the mixing drum. At this time, the first seal, the second seal and the third seal are all in the static sealing working mode. The material is discharged from the mixing drum and the unloading work is completed after flowing through the inner ring and the guide plate.

[0018] D. After the unloading work is completed, clean up the debris remaining on the inner ring and guide plate in time so that they can be reused next time.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] 1. The tail cover sealing assembly in the present invention includes a tail cover plate and a sealing member, and the slewing bearing sealing assembly includes a flange, a first seal, a second seal, and a third seal. The first seal is in contact with the flange to protect the space between the inner ring and the outer ring. The opening and closing driving device is rotatably mounted on the chassis and the feed hopper through both ends. At the same time, the feed hopper and the tail cover plate are fixedly connected. The opening and closing driving device indirectly controls the fit of the tail cover plate. The sealing member is used to seal the outer end surface of the tail cover plate and the inner ring. When the tail cover plate is squeezed by the opening and closing driving device, the sealing member is tightly fitted with the outer end surface of the inner ring, and at the same time, the elastic connecting member enters the inner ring and is axially movably connected with it. Under the constraint of the tail cover, the seal and the inner ring are stationary. When the tail cover is under the action of the opening and closing drive device, the seal and the elastic connector swing outward with the tail cover, and the seal is separated from the inner ring of the slewing bearing seal assembly to achieve the sealing effect of the device. At the same time, two states can be switched. During transportation and feeding, the inner ring, the seal and the elastic connector are stationary when the opening and closing drive device indirectly acts on them. When unloading, the opening and closing drive device drives the seal and the elastic connector to swing backward with the tail cover and separate from the outer end face of the inner ring to achieve a follow-up self-compensation effect, greatly improve the sealing effect, reduce the degree of wear, and have a simple structure and convenient maintenance.

[0021] 2. The special design structure of the first seal in the present invention can effectively prevent the material from entering between the inner ring and the outer ring. At the same time, there is friction between the flanges. When the seal is separated from the inner ring, the inner ring and the outer ring rotate together with the mixing drum under the action of the internal friction force, thereby improving the sealing effect.

[0022] 3. The special position setting of the arc-shaped slotted holes on the flange of the present invention can be used to drain a small amount of water and other impurities that enter the gap between the flange and the slewing bearing sealing assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0024] Figure 2 It is the working state diagram of the overall structure during transportation and feeding in the present invention;

[0025] Figure 3 for Figure 2 A partial enlarged view of the middle A;

[0026] Figure 4 It is a rear view of the flange in the present invention;

[0027] Figure 5 It is a rear view of the inner ring of the slewing bearing seal assembly in the present invention.

[0028] In the figure: 1. chassis; 2. mixing drum; 3. crossbeam; 41. U-shaped bolt; 42. nut; 43. hinge seat; 44. hinge pin; 45. connecting ear; 5. feed hopper; 6. driving member; 61. base one; 62. base two; 7. tail cover; 8. slewing bearing seal assembly; 81. inner ring; 82. outer ring; 83. first seal; 84. second seal; 85. third seal; 86. limit groove; 9. flange; 10. arc-shaped slot; 11. seal; 12. elastic connector; 121. fixing part; 122. mounting part; 123. reset part; 13. guide plate. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0030] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0031] Example 1

[0032] Reference Figures 1 to 5As shown, a follow-up self-compensating concrete mixer tail cover sealing device comprises a chassis 1, a mixing drum 2, a feed hopper 5, a slewing bearing sealing assembly 8, a follow-up hinge device, a tail cover sealing assembly and an opening and closing drive device, wherein the mixing drum 2 is mounted on the chassis 1 through a slewing bearing, the follow-up hinge device is rotatably connected to the chassis 1, the slewing bearing sealing assembly 8 comprises a flange 9, an inner ring 81, an outer ring 82, a first seal 83, a second seal 84 and a third seal 85, the flange 9 is fixedly connected to the outer side of the tail of the mixing drum 2, the outer ring 82 is fixedly connected to the flange 9 through bolts, the inner ring 81 and the outer ring 82 are connected through spherical or cylindrical roller bearings, axially limited but circumferentially rotatable relative to each other, the first seal 83 is fixedly mounted on a side of the inner ring 81 opposite to the flange 9 and fits with the flange 9, the second seal 84 and the third seal 85 are both fixedly mounted on the inner ring 81 to block the gap between the inner ring 81 and the outer ring 82 to prevent debris from entering the raceway gap. The tail cover sealing assembly includes a tail cover plate 7, a seal 11 and an elastic connector 12. The tail cover plate 7 is fixedly connected to the follower hinge device and the feed hopper 5. The seal 11 is fixedly installed on the side of the tail cover plate 7 facing the inner ring 81. The seal 11 is an annular structure and is fixed to the tail cover plate 7 by rivets or bonding. One end of the opening and closing drive device is rotatably installed on the chassis 1, and the other end is rotatably connected to the feed hopper 5. The tail cover plate 7 makes the seal 11 fit or separate from the outer end surface of the inner ring 81 under the action of the opening and closing drive device. The elastic connector 12 is installed on the tail cover plate 7 and is axially plug-connected to the inner ring 81 to achieve fixation or separation.

[0033] In a further preferred solution of this embodiment, the thickness of the first seal 83 on the side opposite to the flange 9 gradually decreases away from the inner ring 81, and the first seal 83 gradually tilts toward the center of the mixing drum 2 away from the inner ring 81. The tip of the first seal 83 is arranged obliquely upward to improve the bearing capacity.

[0034] In a further preferred embodiment of the present invention, the flange 9 is provided with an arc-shaped slot 10, which is located at the top of the connection surface between the flange 9 and the outer ring 82. The arc-shaped slot 10 can be used to drain a small amount of water and other impurities that enter the gap between the flange 9 and the slewing bearing seal assembly 8.

[0035] In a further preferred solution of this embodiment, a pin hole for installing the elastic connector 12 is provided on the tail cover 7, and a stopper groove 86 adapted to the elastic connector 12 is provided on the outer end surface of the inner ring 81. The stopper groove 86 and the elastic connector 12 are axially connected to realize that the inner ring 81 and the tail cover 7 are relatively stationary, which is suitable for transportation and feeding; when unloading, the tail cover 7, the sealing member 11, and the elastic connector 12 are separated from the inner ring 81, and the inner ring 81 and the outer ring 82 rotate together.

[0036] In a further preferred solution of this embodiment, the elastic connector 12 includes a fixing portion 121, a mounting portion 122 and a reset portion 123, the fixing portion 121 is adapted to the limiting groove 86, the mounting portion 122 is movably mounted inside the pin hole and fixedly connected to the fixing portion 121, and the reset portion 123 is sleeved on the outer side of the mounting portion 122 between the fixing portion 121 and the tail cover 7. The reset portion 123 is a spring structure, and when the opening and closing drive device indirectly applies pressure to the tail cover 7, the fixing portion 121 fits with the outer end surface of the inner ring 81, and when the mixer truck continues to rotate, the fixing portion 121 enters the limiting groove 86 under the action of the reset portion 123 to achieve being fixed and stationary together with the inner ring 81, so that the first seal 83, the second seal 84 and the third seal 85 work in a dynamic sealing mode with the outer ring 82.

[0037] In a further preferred solution of the present embodiment, the outer end surface of the inner ring 81 is fixedly connected with a guide plate 13, and the guide plate 13 is used to reverse the flow of the material.

[0038] In a further preferred solution of this embodiment, the follower hinge device comprises a crossbeam 3, a U-shaped bolt 41, a nut 42, a hinge seat 43, a hinge pin 44 and a connecting ear 45, the crossbeam 3 is fixedly connected to the chassis 1, a connecting hole is provided on the hinge seat 43, the U-shaped bolt 41 is sleeved on the crossbeam 3 and passes through the connecting hole and is threadedly connected to the nut 42, the hinge pin is rotatably connected to the hinge seat 43 and is rotatably connected to the connecting ear 45, and the connecting ear 45 is fixedly connected to the tail cover plate 7. By using the connecting ear 45 to move together with the tail cover plate 7, the hinge seat 43 and the crossbeam 3 to realize rotation, and the rotation of the two rotation nodes is realized, so as to facilitate the self-compensation sealing of the device.

[0039] In a further preferred solution of this embodiment, the opening and closing driving device comprises a base 1 61, a base 2 62 and a driving member 6, wherein the base 1 61 is fixedly mounted on the chassis 1, the base 2 62 is fixedly connected to the feed hopper 5, and the two ends of the driving member 6 are respectively rotatably connected to the base 1 61 and the base 2 62. The driving member 6 is a cylinder with a bidirectional action capability, and has a pressure-maintaining locking function and a manual pressure relief protection function.

[0040] The working principle of the tail cover sealing device is:

[0041] During the feeding and road transportation process, the tail cover is in a closed state. At this time, the outer ring 82 rotates with the flange 9 and the mixing drum 2; one end of the fixing portion 121 of the elastic connector 12 enters the circumferential limit groove on the end face of the inner ring 81, and the two are restrained by the tail cover plate 7 and remain stationary. At the same time, the seal 11 fits tightly with the end face of the inner ring 81, and no relative sliding wear will occur. The first seal 83, the second seal 84 and the third seal 85 are in the dynamic sealing working mode, and together with the seal 11, they can effectively prevent material leakage.

[0042] When the mixing drum 2 is deformed due to load, Slewing bearing seal assembly 8 It moves with the mixing drum 2 and maintains a good follow-up effect. At this time, if there is a gap between the seal 11 and the end face of the inner ring 81 of the slewing bearing, the tail cover 7 will swing slightly under the action of the air pressure opening and closing drive device 6, so that the seal 11 and the end face of the inner ring 81 of the slewing bearing maintain a certain fit. The axial displacement of the end face of the inner ring 81 of the mixing drum 2 after the load deformation is very complicated. According to the force analysis, it is usually upper side Large torus displacement Therefore, at this time, the gap between the seal 11 and the end face of the inner ring 81 is different in size and the force is uneven. Usually, the lower ring face is subjected to greater force, and is in a partially tight fit state. At this time, the sealing requirements of different gap positions are achieved through the elastic deformation of the seal 11, thereby realizing the sealing self-compensation function.

[0043] During the unloading process, the pneumatic opening and closing drive device 6 causes the seal 11 to swing together with the tail cover plate 7 and break away from the fitting state. Under the action of the internal friction force, the slewing bearing seal assembly 8 rotates together with the mixing drum 2 as a whole. At this time, the first seal 83, the second seal 84 and the third seal 85 are all in the static sealing working mode. The material is discharged from the mixing drum 2 and flows through the slewing bearing inner ring 81 and the concrete guide plate 13 to complete the unloading operation. After the unloading is completed, the concrete debris left on the slewing bearing seal device should be cleaned in time to increase the service life.

[0044] Embodiment 2:

[0045] A method for implementing a follow-up self-compensating concrete mixer truck tail cover sealing device comprises the following steps:

[0046] A. During feeding and road transportation, the tail cover plate 7 is indirectly acted upon by the driving member 6 so that the tail of the mixing drum 2 is in a closed state; at this time, the outer ring 82 rotates together with the flange 9 and the mixing drum 2, and the fixing portion 121 of the elastic connecting member 12 moves into the limiting groove 86 on the inner ring 81 under the action of the reset portion 123, and the fixing portion 121 and the inner ring 81 remain stationary after being constrained by the tail cover plate 7; at the same time, the sealing member 11 is tightly fitted with the outer end surface of the inner ring 81, and relative sliding wear will not occur; the first seal 83, the second seal 84 and the third seal 85 are all in the dynamic sealing working mode, and together with the seal 11, the material is prevented from leaking from the tail of the mixing drum 2;

[0047] B. By continuously feeding materials into the mixing drum 2, the mixing drum 2 is deformed by hand bearing, and the outer ring 82 moves together with the mixing drum 2. At this time, a gap appears between the seal 11 and the outer end surface of the inner ring 81. The tail cover plate 7 swings slightly under the action of the opening and closing drive device, so that the seal 11 and the outer end surface of the inner ring 81 remain in a fitting state;

[0048] C. When the material arrives at the destination for unloading, the opening and closing driving device drives the seal 11 and the elastic connector 12 to swing toward the rear side of the mixing drum 2 together with the tail cover plate 7, and the seal 11 and the elastic connector 12 are separated from the contact state with the outer end surface of the inner ring 81. Under the internal friction force, the inner ring 81 and the outer ring 82 rotate together with the mixing drum 2. At this time, the first seal 83, the second seal 84 and the third seal 85 are all in the static sealing working mode. The material is discharged from the mixing drum 2 and the unloading work is completed after flowing through the inner ring 81 and the guide plate 13.

[0049] D. After the unloading work is completed, the debris remaining on the inner ring 81 and the guide plate 13 is cleaned up so that they can be reused next time.

[0050] The present invention realizes: adopting a follow-up rotary connection device design scheme to realize the flexible connection and sealing function between the rotary connection device and the tail cover plate. At the same time, it can effectively avoid abnormal stress and wear of parts caused by the load-bearing deformation of the mixing drum, greatly improving the service life of the overall device. A self-compensating sealing scheme is adopted. When a gap appears between the seal and the inner ring end face, the tail cover plate swings slightly under the action of the air pressure opening and closing drive device, prompting the seal and the inner ring end face to maintain a certain fit state, and the elastic deformation of the seal is used to achieve the sealing requirements of different gap positions, effectively improving the reliability of the tail cover sealing device. An integrated rotary connection device design scheme is adopted, which has a simple structure, is easy to manufacture and maintain, and effectively saves production costs.

[0051] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. The replacement may be a replacement of a part of the structure, device, method step, or a complete technical solution. Any equivalent replacement or change according to the technical solution and the inventive concept of the present invention shall be covered within the protection scope of the present invention.

Claims

1. A follow-up self-compensating tail cover sealing device for a concrete mixer truck, comprising a chassis (1), a mixing drum (2), a feed hopper (5), a slewing bearing sealing assembly (8), a follow-up hinge device, a tail cover sealing assembly, and an opening and closing drive device. The mixing drum (2) is installed on the chassis (1) through a rotary support, and the follow-up hinge device is rotatably connected to the chassis (1). Characterized in that: The slewing bearing sealing assembly (8) includes a flange plate (9), an inner ring (81), an outer ring (82), a first seal (83), a second seal (84), and a third seal (85). The flange plate (9) is fixedly connected to the tail of the mixing drum (2). The outer ring (82) is fixedly connected to the flange plate (9) by bolts. The first seal (83) is fixedly installed on one side of the inner ring (81) opposite to the flange plate (9) and is in contact with the flange plate (9). The second seal (84) and the third seal (85) are both fixedly installed on the inner ring (81) to block the gap between the inner ring (81) and the outer ring (82). The tail cover sealing assembly includes a tail cover plate (7), a seal (11), and an elastic connecting member (12). The tail cover plate (7) is fixedly connected to both the follow-up hinge device and the feed hopper (5). The seal (11) is fixedly installed on the side of the tail cover plate (7) facing the inner ring (81). One end of the opening and closing drive device is rotatably installed on the chassis (1), and the other end is rotatably connected to the feed hopper (5). The tail cover plate (7) makes the seal (11) fit or separate from the outer end face of the inner ring (81) under the action of the opening and closing drive device. The elastic connecting member (12) is installed on the tail cover plate (7) and is axially movably connected to the inner ring (81). A pin hole for installing the elastic connecting member (12) is formed on the tail cover plate (7), and a limiting groove (86) adapted to the elastic connecting member (12) is formed on the outer end face of the inner ring (81). The elastic connecting member (12) includes a fixing portion (121), an installation portion (122), and a reset portion (123). The fixing portion (121) is adapted to the limiting groove (86). The installation portion (122) is movably installed inside the pin hole and is fixedly connected to the fixing portion (121). The reset portion (123) is sleeved on the outside of the installation portion (122) between the fixing portion (121) and the tail cover plate (7).

2. A follow-up self-compensating tail cover sealing device for a concrete mixer truck according to claim 1, Characterized in that, The thickness of the first seal (83) on the side opposite to the flange plate (9) gradually decreases in the direction away from the inner ring (81), and the first seal (83) gradually inclines towards the center of the mixing drum (2) in the direction away from the inner ring (81).

3. A follow-up self-compensating tail cover sealing device for a concrete mixer truck according to claim 1, Characterized in that, An arc-shaped slot hole (10) is formed on the flange plate (9), and the arc-shaped slot hole (10) is located at the top of the connection surface between the flange plate (9) and the outer ring (82).

4. A follow-up self-compensating tail cover sealing device for a concrete mixer truck according to claim 1, Characterized in that, A deflector plate (13) is fixedly connected to the outer end face of the inner ring (81).

5. A follow-up self-compensating concrete mixer tail cover sealing device according to claim 4, characterized in that the follow-up hinge device includes a cross beam (3), a U-shaped bolt (41), a nut (42), a hinge seat (43), a hinge pin shaft (44) and a connecting ear (45). The cross beam (3) is fixedly connected to the chassis (1). A connecting hole is provided on the hinge seat (43). The U-shaped bolt (41) is sleeved on the cross beam (3) and penetrates through the connecting hole and is threadedly connected to the nut (42). The hinge pin shaft (44) is rotatably connected to the hinge seat (43) and is rotatably connected to the connecting ear (45). The connecting ear (45) is fixedly connected to the tail cover plate (7).

6. A follow-up self-compensating concrete mixer tail cover sealing device according to claim 5, characterized in that the opening and closing driving device includes a base one (61), a base two (62) and a driving member (6). The base one (61) is fixedly installed on the chassis (1). The base two (62) is fixedly connected to the feed hopper (5). Both ends of the driving member (6) are rotatably connected to the base one (61) and the base two (62) respectively.

7. An implementation method of a follow-up self-compensating concrete mixer tail cover sealing device according to claim 6, characterized in that it includes the following steps: A. During the feeding and road transportation processes, the tail cover plate (7) causes the tail of the mixing drum (2) to be in a closed state under the indirect action of the driving member (6). At this time, the outer ring (82) rotates together with the flange (9) and the mixing drum (2). The fixed part (121) of the elastic connecting member (12) moves into the limiting groove (86) on the inner ring (81) under the action of the reset part (123). The fixed part (121) and the inner ring (81) remain stationary after being restricted by the tail cover plate (7). At the same time, the sealing member (11) is in close contact with the outer end face of the inner ring (81) and no relative sliding wear will occur. The first seal (83), the second seal (84) and the third seal (85) are all in the dynamic seal working mode, and together with the sealing member (11), they prevent the material from leaking from the tail of the mixing drum (2). B. By continuously feeding materials into the mixing drum (2), the mixing drum (2) deforms under the load. The outer ring (82) moves together with the mixing drum (2). At this time, a gap appears between the sealing member (11) and the outer end face of the inner ring (81). The tail cover plate (7) makes a small swing under the action of the opening and closing driving device, so as to keep the sealing member (11) in close contact with the outer end face of the inner ring (81). C. When discharging materials at the destination, the opening and closing drive device drives the seal (11) and the elastic connecting piece (12) to swing towards the rear side of the mixing drum (2) together with the tail cover plate (7), getting out of the fitting state with the outer end face of the inner ring (81). Under the action of the internal frictional force, the inner ring (81) and the outer ring (82) rotate together with the mixing drum (2). At this time, the first seal (83), the second seal (84) and the third seal (85) are all in the static seal working mode, and the materials are output from the mixing drum (2), flow through the inner ring (81) and the guide plate (13), and then the discharging work is completed; D. After the discharging work is completed, clean up the sundries remaining on the inner ring (81) and the guide plate (13) in time for repeated use next time.

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