A rotary sealing structure and method for the tail cover of a mixer

Abstract

The present invention relates to a rotary sealing structure and method for a stirring vehicle tail cover, including a tank body, a tank body sealing cover assembly and a rotary sealing device. A tank mouth flange is fixedly connected to the tank mouth of the tank body, and a tubular tank mouth straight section is fixedly connected to the outer side of the tank mouth flange. The rotary sealing device includes a wear-resistant bushing and a rotary support sleeved on the outer circle of the tank mouth straight section. The end face of the outer circle of the rotary support is connected to the tank mouth flange, and the end face of the inner circle of the rotary support is connected to the tank body sealing cover assembly. The wear-resistant bushing includes a flange plate portion attached to the outer side of the tank mouth flange and a wear-resistant sleeve portion attached to the outer circle of the tank mouth straight section. A radial sealing ring assembly is installed between the inner circle of the rotary support and the outer circle of the wear-resistant sleeve portion. By changing the position of the sealing ring groove, the sealing ring is arranged in the inner circle of the rotary support, so that a radial seal is formed between the sealing ring and the wear-resistant sleeve outside the tank mouth straight section. The radial seal is suitable for rotary dynamic sealing and can greatly slow down the wear speed of the sealing member.

Description

Technical Field

[0001] The present invention relates to the field of mixer trucks, and more particularly to the field of mixer truck rear covers, specifically a rotary sealing structure and method for a mixer truck rear cover. Background Art

[0002] The mining mixer truck is a transport vehicle widely used in mines and tunnels. Due to the height limitation of the tunnel, the overall height of the mixer truck is also strictly restricted. The reduction of the overall height of the vehicle determines that the inclination angle of the mixing tank will not be too large. Some manufacturers even place the tank horizontally. The reduction of the inclination angle greatly limits the effective volume of the tank. Therefore, most mining mixer trucks adopt the method of tail cover sealing to increase their effective volume. At the same time, the sealed tail door can reduce the evaporation of concrete moisture and improve the transportation quality.

[0003] The invention patent with the application number 202010181209.8 discloses a technology for rotary sealing of the inlet and outlet of a mixing drum. This technology uses a method of setting a seal between the sealing cover and the outer end face of the inner ring of the slewing bearing to prevent medium leakage, and the seal uses an O-ring. This type of sealing method belongs to end face sealing, and most end face sealing methods are used for static sealing. However, due to the rotation of the tank body, there is relative rotation between the inner ring of the slewing bearing and the sealing cover. Therefore, this should belong to the category of dynamic sealing. Therefore, this design scheme will cause serious wear of the seal. When the elastic compensation amount of the O-ring cannot offset its excessive wear amount, leakage will occur, greatly reducing its service life. Summary of the Invention

[0004] In view of the deficiencies of the prior art, the present invention provides a rotary sealing structure and method for a mixer truck rear cover.

[0005] The present invention is realized through the following technical solutions. A rotary sealing structure and method for a mixer truck rear cover are provided, including a tank body and a tank body sealing cover assembly. A tank mouth flange is fixedly connected to the tank mouth of the tank body, and a tubular tank mouth straight section is fixedly connected to the outside of the tank mouth flange. The tank body and the tank body sealing cover assembly are connected through a rotary sealing device. The rotary sealing device includes a wear-resistant bushing and a slewing bearing sleeved on the outer circle of the tank mouth straight section. The end face of the outer circle of the slewing bearing is connected to the tank mouth flange through an outer circle connecting bolt, and the end face of the inner circle of the slewing bearing is connected to the tank body sealing cover assembly through an inner circle connecting bolt. The wear-resistant bushing includes a flange plate portion attached to the outside of the tank mouth flange and a wear-resistant sleeve portion attached to the outer circle of the tank mouth straight section. A radial seal assembly is installed between the inner circle of the slewing bearing and the outer circle of the wear-resistant sleeve portion.

[0006] The slewing bearing in this solution realizes the rotational connection between the tank body and the tank body seal cover assembly. By fixedly connecting a tubular tank mouth straight section outside the tank mouth flange, the slewing bearing is sleeved on the outer circle of the tank mouth straight section. A wear-resistant sleeve part of a wear-resistant bushing is fixedly attached to the outer circle of the tank mouth straight section, and a radial seal ring assembly is installed between the inner circle of the slewing bearing and the outer circle of the wear-resistant sleeve part, forming a radial seal between the inner circle of the slewing bearing and the tank mouth straight section, improving the sealing effect.

[0007] As an optimization, the radial seal ring assembly includes a first radial seal ring and a second radial seal ring. A first radial seal groove for accommodating the first radial seal ring and a second radial seal groove for accommodating the second radial seal ring are provided in the inner hole of the inner circle of the slewing bearing. The radial seal ring assembly in this solution includes a first radial seal ring and a second radial seal ring, thereby improving the sealing effect through two seal rings and preventing the leakage of concrete medium from the gap between the inner circle of the slewing bearing and the wear-resistant bushing.

[0008] As an optimization, a first end face seal ring is installed between the end face of the tank body seal cover assembly and the inner circle of the slewing bearing. The first end face seal ring in this solution forms an end face seal. Since there is no relative rotation between the inner circle of the slewing bearing and the tank body seal cover assembly, this end face seal belongs to a static seal, and this seal ring prevents the leakage of concrete medium from the gap between the outer end face of the inner circle of the slewing bearing and the tank body seal cover assembly.

[0009] As an optimization, a second end face seal ring is installed between the tank mouth flange and the flange plate part of the wear-resistant bushing. The second end face seal ring and the outer end face of the tank mouth flange together form an end face seal. Since there is no relative rotation between the flange plate part of the wear-resistant bushing and the tank mouth flange, this end face seal belongs to a static seal, and this seal ring prevents the leakage of medium from the gap between the flange plate part of the wear-resistant bushing and the tank mouth flange.

[0010] As an optimization, a first bearing seal strip and a second bearing seal strip are respectively installed at both ends of the connection surface between the outer circle and the inner circle of the slewing bearing. In this solution, a bearing seal strip is installed on each side of the slewing bearing track. It prevents the pollution of the slewing bearing track by concrete medium, and at the same time seals the lubricating grease within the track, ensuring the lubrication of the slewing bearing and reducing the driving torque of the mixing tank.

[0011] As an optimization, the tank mouth straight section is fixedly connected to the inner circle outside the tank mouth flange. In this solution, the tank mouth straight section is fixedly connected to the inner circle outside the tank mouth flange, enabling the direct pouring out of the internal materials and preventing material accumulation.

[0012] As an optimization, the tank body seal cover assembly includes a seal cover plate and a feed hopper installed outside the seal cover plate. A discharge port is opened on the seal cover plate, and the end face of the inner circle of the slewing bearing is connected to the seal cover plate. Materials enter the tank body from the feed hopper and are discharged from the discharge port.

[0013] As an optimization, the outer ring connecting bolts pass through the flange portion of the wear-resistant bushing. In this solution, the outer ring connecting bolts pass through the flange portion of the wear-resistant bushing, thereby realizing the fixation of the entire wear-resistant bushing.

[0014] A rotary sealing method using a rotary sealing structure:

[0015] a. A rotary support is arranged between the tank body and the tank body sealing cover assembly. The outer ring of the rotary support is connected to the tank mouth flange of the tank body, and the inner ring of the rotary support is connected to the tank body sealing cover assembly, thereby realizing the rotational connection between the tank body and the tank body sealing cover assembly;

[0016] b. By fixedly connecting a tubular tank mouth straight section outside the tank mouth flange, the rotary support is sleeved on the outer circle of the tank mouth straight section. A wear-resistant sleeve portion of a wear-resistant bushing is fixedly attached to the outer circle of the tank mouth straight section, and a radial sealing ring assembly is installed between the inner ring of the rotary support and the outer circle of the wear-resistant sleeve portion, so as to form a radial seal between the inner ring of the rotary support and the tank mouth straight section, improving the sealing effect;

[0017] c. By arranging the wear-resistant bushing, the wear speed of the seal is slowed down, and the service life of the seal is increased.

[0018] The beneficial effects of the present invention are as follows: A rotary sealing structure and method for the rear cover of a mixer truck according to the present invention, by changing the position of the sealing ring groove, arranging the sealing ring in the inner ring of the rotary support, forming a radial seal between the sealing ring and the wear-resistant sleeve outside the tank mouth straight section, and the radial seal is suitable for rotary dynamic seals, which can greatly slow down the wear speed of the seal. The wear-resistant sleeve installed outside the tank mouth straight section further slows down the wear speed of the seal, greatly increasing the service life of the seal. The sealing end cover is connected to the inner ring of the rotary support, and the outer ring of the rotary support is connected to the tank mouth flange through bolts, which is convenient for disassembly and maintenance and replacing the worn seal. The wear-resistant bushing can also be disassembled and replaced, reducing the later use and maintenance costs. The entire feeding and discharging sealing device is installed on the tank body through the rotary support and has no connection with the vehicle frame. Therefore, this device can float up and down with the tank body as a whole during transportation, avoiding the phenomenon that the rotary support is stuck due to the non-concentricity of the inner and outer rings. Description of the Drawings

[0019] Figure 1 is a schematic side view of the overall structure of the present invention;

[0020] Figure 2 is a schematic rear view of the overall structure of the present invention;

[0021] Figure 3 is a partially enlarged view of the rotary sealing device of the present invention;

[0022] Figure 4 is a partially enlarged view of the rotary sealing device of the present invention;

[0023] Figure 5 It is a schematic diagram of the can mouth flange of the present invention;

[0024] Figure 6 It is a schematic diagram of the tank body sealing cover assembly of the present invention;

[0025] As shown in the figure:

[0026] 1. Rotary sealing device; 2. Tank body; 3. Tank body sealing cover assembly; 4. Opening oil cylinder; 5. Discharge door; 6. Floating circumferential stop pin; 7. Outer ring connecting bolt; 8. Inner ring connecting bolt; 101. Rotary support outer ring; 102. Rotary support inner ring; 103. Wear-resistant bushing; 104. Track ball; 105. First radial sealing groove; 106. Second radial sealing groove; 107. First end face sealing groove; 108. Second end face sealing groove; 109. First radial sealing ring; 110. Second radial sealing ring; 111. First end face sealing ring; 112. Second end face sealing ring; 113. First bearing sealing strip; 114. Second bearing sealing strip; 201. Can mouth flange; 202. Can mouth straight section; 301. Feed hopper; 302. Discharge port; 303. Sealing cover plate. Specific embodiments

[0027] To clearly illustrate the technical features of this solution, the following will elaborate on this solution through specific embodiments.

[0028] As Figures 1 to 6 shown, a rotary sealing structure for the tail cover of a mixer truck according to the present invention includes a tank body 2 and a tank body sealing cover assembly 3. A can mouth flange 201 is fixedly connected to the can mouth of the tank body 2. The can mouth flange 201 is an annular flat flange plate, and the can mouth flange 201 is welded to the tank body 2. A tubular can mouth straight section 202 is fixedly connected to the outside of the can mouth flange 201. In this embodiment, the can mouth straight section 202 is fixedly connected to the inner circle on the outside of the can mouth flange 201, and the axis of the can mouth straight section 202 is perpendicular to the can mouth flange 201.

[0029] The tank body 2 and the tank body sealing cover assembly 3 are connected through a rotary sealing device 1. The rotary sealing device 1 includes a wear-resistant bushing 103 and a rotary support sleeved on the outer circle of the can mouth straight section 202. The rotary support includes a rotary support outer ring 101, a rotary support inner ring 102, and a track ball 104. Among them, the rotary support outer ring 101, the rotary support inner ring 102, and the track ball 104 are used as an integral assembly. The track ball 104 and the cage connect the rotary support outer ring 101 and the rotary support inner ring 102 together, and enable the inner and outer rings to rotate freely.

[0030] At both ends of the joint surface between the outer ring 101 and the inner ring 102 of the slewing bearing, a first bearing seal strip 113 and a second bearing seal strip 114 are respectively installed. This protects the track balls 104 from concrete contamination, and at the same time seals the lubricating grease within the track, ensuring the lubrication of the slewing bearing and reducing the driving torque of the mixing tank.

[0031] The end face of the outer ring 101 of the slewing bearing is connected to the tank mouth flange 201 through the outer ring connection bolts 7, and the end face of the inner ring 102 of the slewing bearing is connected to the tank body seal cover assembly 3 through the inner ring connection bolts 8. In this way, the entire weight of the rotary seal device 1 and the tank body seal cover assembly is supported by the tank body 2 and can jump with the tank body as a whole.

[0032] The wear-resistant bushing 103 includes a flange plate portion attached to the outside of the tank mouth flange 201 and a wear-resistant sleeve portion attached to the outer circle of the straight section 202 of the tank mouth. The flange plate portion is an annular flat plate, and the wear-resistant sleeve portion is tubular. The flange plate portion and the wear-resistant sleeve portion are welded together to form an annular wear-resistant bushing 103, so that the cross-section of the wear-resistant bushing 103 is L-shaped.

[0033] The flange plate portion is connected between the tank mouth flange 201 and the outer ring 101 of the slewing bearing, and the wear-resistant sleeve portion is located between the inner ring 102 of the slewing bearing and the straight section 202 of the tank mouth. The outer ring connection bolts 7 pass through the flange plate portion of the wear-resistant bushing 103, thereby realizing the fixation of the flange plate portion and also realizing the fixation of the wear-resistant bushing 103.

[0034] A radial seal ring assembly is installed between the outer circle of the inner ring 102 of the slewing bearing and the wear-resistant sleeve portion. The radial seal ring assembly includes a first radial seal ring 109 and a second radial seal ring 110. In the inner hole of the inner ring 102 of the slewing bearing, there are a first radial seal groove 105 for accommodating the first radial seal ring 109 and a second radial seal groove 106 for accommodating the second radial seal ring 110. The two seal rings prevent the concrete medium from leaking out through the gap between the inner ring 102 of the slewing bearing and the wear-resistant bushing 103. Since the wear-resistant bushing 103 rotates relative to the inner ring 102 of the slewing bearing here, the seal here is a dynamic seal.

[0035] A first end face seal ring 111 is installed between the end face of the tank body seal cover assembly 3 and the inner ring 102 of the slewing bearing. The outer end face of the inner ring 102 of the slewing bearing is machined with a first end face seal groove 107, and the first end face seal ring 111 is installed inside. This seal ring prevents the concrete medium from leaking out through the end face gap between the seal cover plate 303 and the inner ring 102 of the slewing bearing. Since there is no relative rotation between the seal cover plate 303 and the inner ring 102 of the slewing bearing, it belongs to the static seal method.

[0036] A second end face sealing ring 112 is installed between the can mouth flange 201 and the flange portion of the wear-resistant bushing 103. The outer end face of the flange portion of the wear-resistant bushing 103 is machined with a second end face sealing groove 108, and the second end face sealing ring 112 is installed inside. This sealing ring prevents the concrete medium from leaking out through the end face gap between the outer end face of the flange portion of the wear-resistant bushing 103 and the can mouth flange 201. Since there is no relative rotation between the outer end face of the flange of the wear-resistant bushing 103 and the can mouth flange 201, it belongs to the static sealing method.

[0037] The tank body sealing cover assembly 3 includes a sealing cover plate 303 and a feeding hopper 301 installed outside the sealing cover plate 303. A discharge port 302 is opened on the sealing cover plate 303, and the end face of the inner ring 102 of the slewing bearing is connected to the sealing cover plate 303.

[0038] The opening and closing of the discharge port 302 is realized by a discharge door 5 controlled by an opening cylinder 4. When the mixer truck needs to be loaded, the discharge door 5 is closed, and the material enters the tank body from the feeding hopper 301 to realize the mixing and transportation of the material. When discharging is required, the discharge door 5 is opened, and the material is discharged from the discharge port 302. During this process, due to the protection of the rotary sealing device 1, the leakage of concrete during the transportation process and the feeding and discharging process is avoided.

[0039] The tank body sealing cover assembly 3 is equipped with a floating circumferential stop pin 6. The floating circumferential stop pin 6 is hinged to the bracket on the vehicle frame and has a clearance for up and down movement. In this way, when the tank body 2 rotates, the tank body sealing cover assembly 3 remains stationary due to the action of the floating circumferential stop pin 6. Since the specific hinge structure is not the focus of this patented technology, it is not specifically shown.

[0040] A rotary sealing method using a rotary sealing structure:

[0041] a. A slewing bearing is provided between the tank body 2 and the tank body sealing cover assembly 3. The outer ring 101 of the slewing bearing is connected to the can mouth flange 201 of the tank body 2, and the inner ring 102 of the slewing bearing is connected to the tank body sealing cover assembly 3, thereby realizing the rotational connection between the tank body 2 and the tank body sealing cover assembly 3;

[0042] b. By fixedly connecting a tubular can mouth straight section 202 outside the can mouth flange 201, the slewing bearing is sleeved on the outer ring of the can mouth straight section 202. A wear-resistant sleeve portion of the wear-resistant bushing 103 is fixedly attached to the outer ring of the can mouth straight section 202, and a radial sealing ring assembly is installed between the inner ring 102 of the slewing bearing and the outer ring of the wear-resistant sleeve portion, so as to form a radial seal between the inner ring 102 of the slewing bearing and the can mouth straight section 202 and improve the sealing effect;

[0043] c. By providing the wear-resistant bushing 103, the wear speed of the sealing member is slowed down, and the service life of the sealing member is improved.

[0044] Of course, the above description is not limited to the above examples. The technical features not described in the present invention can be implemented by or adopt the prior art, which will not be elaborated here. The above embodiments and accompanying drawings are only used to illustrate the technical solutions of the present invention and are not a limitation to the present invention. The present invention has been described in detail with reference to the preferred embodiments. Those of ordinary skill in the art should understand that any changes, modifications, additions or substitutions made by those of ordinary skill in the technical field within the essence of the present invention do not depart from the purpose of the present invention and should also fall within the protection scope of the claims of the present invention.

Claims

1. A rotary sealing structure for the tail cover of a stirring tank, comprising a tank body (2) and a tank body sealing cover assembly (3), characterized in that: A tank flange (201) is fixedly connected to the mouth of the tank body (2). A tubular straight section (202) of the tank mouth is fixedly connected to the outside of the tank mouth flange (201). The tank body (2) and the tank body seal cover assembly (3) are connected through a rotary seal device (1). The rotary seal device (1) includes a wear-resistant bushing (103) and a rotary support sleeved on the outer circle of the straight section (202) of the tank mouth. The end face of the outer circle (101) of the rotary support is connected to the tank mouth flange (201) through an outer circle connecting bolt (7). The end face of the inner circle (102) of the rotary support is connected to the tank body seal cover assembly (3) through an inner circle connecting bolt (8). The wear-resistant bushing (103) includes a flange plate portion attached to the outside of the tank mouth flange (201) and a wear-resistant sleeve portion attached to the outer circle of the straight section (202) of the tank mouth. A radial seal ring assembly is installed between the inner circle (102) of the rotary support and the outer circle of the wear-resistant sleeve portion.

2. The rotary sealing structure for the tail cover of a mixer according to claim 1, wherein: The radial seal ring assembly includes a first radial seal ring (109) and a second radial seal ring (110). A first radial seal groove (105) for accommodating the first radial seal ring (109) and a second radial seal groove (106) for accommodating the second radial seal ring (110) are provided in the inner hole of the inner circle (102) of the rotary support.

3. The rotary seal structure for the tail cover of a mixer according to claim 1, characterized in that: A first end face seal ring (111) is installed between the end face of the tank body seal cover assembly (3) and the inner circle (102) of the rotary support.

4. A rotary sealing structure for a stirring vehicle tail cover according to claim 1, characterized in that: A second end face seal ring (112) is installed between the tank mouth flange (201) and the flange plate portion of the wear-resistant bushing (103).

5. A rotary seal structure for the tail cover of a mixer, characterized in that: A first bearing seal strip (113) and a second bearing seal strip (114) are respectively installed at both ends of the connection surface between the outer circle (101) and the inner circle (102) of the rotary support.

6. The rotary sealing structure for the tail cover of a stirring vehicle according to claim 1, characterized in that: The straight section (202) of the tank mouth is fixedly connected to the inner circle on the outside of the tank mouth flange (201).

7. A rotary sealing structure for a mixing truck tail cover according to claim 1, characterized in that: The tank body seal cover assembly (3) includes a seal cover plate (303) and a feed hopper (301) installed on the outside of the seal cover plate (303). A discharge port (302) is opened on the seal cover plate (303). The end face of the inner circle (102) of the rotary support is connected to the seal cover plate (303).

8. A rotary seal structure for a mixing truck tail cover according to claim 1, characterized in that: The outer circle connecting bolt (7) passes through the flange plate portion of the wear-resistant bushing (103).

9. A rotary seal method using the rotary seal structure according to claim 1, characterized in that: a. A rotary support is provided between the tank body (2) and the tank body seal cover assembly (3). The outer circle (101) of the rotary support is connected to the tank mouth flange (201) at the mouth of the tank body (2), and the inner circle (102) of the rotary support is connected to the tank body seal cover assembly (3), thereby realizing the rotational connection between the tank body (2) and the tank body seal cover assembly (3); b. By fixedly connecting a tubular tank mouth straight section (202) to the outside of the tank mouth flange (201), the slewing bearing is sleeved on the outer ring of the tank mouth straight section (202). A wear-resistant sleeve part of a wear-resistant bushing (103) is fixedly attached to the outer ring of the tank mouth straight section (202), and a radial sealing ring assembly is installed between the inner ring (102) of the slewing bearing and the outer ring of the wear-resistant sleeve part, so as to form a radial seal between the inner ring (102) of the slewing bearing and the tank mouth straight section (202), improving the sealing effect; c. By providing the wear-resistant bushing (103), the wear rate of the seal is slowed down and the service life of the seal is increased.

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