A gas seal device in the lower frame of a medium-speed coal mill

Abstract

The present invention discloses an air seal device in the lower frame of a medium-speed coal mill, which relates to the field of coal mills and includes a transmission disc, a carbon sealing ring installed below the outer surface of the transmission disc, an inner air seal connecting ring installed on the top of the carbon sealing ring through a first mounting bolt, and four outer sealing rings installed on the outer wall of the inner air seal connecting ring through a plurality of second mounting bolts. The present invention is provided with a sealing assembly. When it is necessary to seal the gap between the inner air seal connecting ring and the outer sealing ring, the user can rotate the turntable through the handle. When the turntable rotates, it drives the screw to rotate. When the screw rotates, it drives the cam to rotate. When the cam rotates, it pushes the slide plate downward. When the slide plate moves downward, it drives the connecting rod and the sealing ring downward, so that the sealing ring is stuck into the inside of the slot, so as to achieve sealing between the transmission disc and the outer sealing ring, prevent a large gap from being generated between the transmission disc and the outer sealing ring, improve the sealing between the transmission disc and the outer sealing ring, and improve the use effect of the coal mill.

Description

Technical Field

[0001] The invention relates to the field of coal mills, in particular to an air seal device in a lower frame of a medium-speed coal mill. Background Art

[0002] The medium-speed coal mill is an important auxiliary equipment in thermal power plants. Its operating conditions directly affect the safety, stability and economy of the unit. It is a machine that crushes coal blocks and grinds them into coal powder. It is an important auxiliary equipment for pulverized coal furnaces. Coal mills include vertical mills, high-pressure suspended roller mills, medium-speed micro-powder mills, overpressure trapezoidal mills, Raymond mills and other models. However, the sealing surface of the air seal in the lower frame of the medium-speed coal mill is very prone to wear after long-term operation, which causes the gap between the internal air seal and the transmission disc sealing surface to gradually increase, resulting in insufficient sealing air pressure in the sealing chamber of the lower frame, and eventually causing the air seal in the lower frame of the medium-speed coal mill to lose its sealing performance.

[0003] According to a Chinese patent with publication number CN204512435U, a gas seal sealing device in the lower frame of a medium-speed coal mill is disclosed. The utility model can adjust the gap between the sealing surface of the adjustment ring and the sealing surface of the transmission disc at any time, and has good sealing performance, convenient inspection and maintenance, low maintenance cost, and is easy to implement; since there is a certain gap between the adjustment ring and the transmission disc in the utility model, and the gap is difficult to be sealed, the sealing between the transmission disc and the adjustment ring is poor, thereby reducing the use effect of the transmission disc; at the same time, when the adjustment ring is installed by bolts, since the adjustment ring may move, it is difficult for the bolt hole on the adjustment ring to be aligned with the bolt hole on the inner gas seal connecting ring, making it difficult for the user to quickly screw the bolt into the corresponding bolt hole, thereby reducing the installation efficiency of the adjustment ring. Summary of the Invention

[0004] Based on this, the purpose of the present invention is to provide an air seal device in the lower frame of a medium-speed coal mill to solve the technical problems of poor sealing between the transmission disc and the adjustment ring and inconvenience in quickly installing the adjustment ring.

[0005] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: an air seal device in the lower frame of a medium-speed coal mill, comprising a transmission plate, a carbon sealing ring installed below the outer surface of the transmission plate, an inner air seal connecting ring installed on the top of the carbon sealing ring through a first mounting bolt, four outer sealing rings installed on the outer wall of the inner air seal connecting ring through a plurality of second mounting bolts, a limiting assembly is arranged between the inner air seal connecting ring and the outer sealing ring, a notch is provided on the top of the outer sealing ring, sealing assemblies are arranged around the bottom of the transmission plate, and a sealed air chamber is arranged between the inner air seal connecting ring and the transmission plate.

[0006] By adopting the above technical solution, the first mounting bolt can fix the inner gas seal connecting ring, and the provision of the second mounting bolt can enable the outer sealing ring to be installed on the outer wall of the carbon sealing ring.

[0007] Furthermore, the sealing assembly includes a cavity opened around the bottom of the transmission disk, a bearing is installed on one side of the interior of the cavity, one end of the bearing is connected to a screw extending to the outside of the transmission disk, a turntable is fixed to one end of the screw, a cam is sleeved on the outer wall of the screw, and sliding grooves are opened on both sides of the cavity, a slide is provided between the two sliding grooves, a return spring is fixed to the lower inside of the sliding groove, a plurality of connecting rods are fixed to the bottom of the slide, and a sealing ring is fixed to the bottom end of the connecting rod.

[0008] By adopting the above technical solution, when the gap between the transmission disc and the outer sealing ring needs to be sealed, the user can rotate the cam through the turntable, so that the slide drives the sealing ring downward, and then the sealing ring can be stuck into the inside of the groove.

[0009] Furthermore, the top end of the return spring is connected to the slide plate, and the sealing ring and the connecting rod are both slidably connected to the slide groove through the slide plate.

[0010] By adopting the above technical solution, when the slide plate moves downward, it will drive the connecting rod and the sealing ring to move downward, so that the sealing ring is stuck into the inside of the groove to achieve sealing between the transmission plate and the outer sealing ring.

[0011] Furthermore, the cam is located directly above the slide plate, a rotating handle is fixed above one side of the rotating disk, and the screw is threadedly connected to the transmission disk.

[0012] By adopting the above technical solution, the user can rotate the turntable through the handle. When the turntable rotates, it will drive the screw to rotate. When the screw rotates, it will drive the cam to rotate. When the cam rotates, it pushes the slide plate to move downward.

[0013] Furthermore, the sealing ring is located directly above the notch, and the sealing ring is adapted to the notch.

[0014] By adopting the above technical solution, the sealing ring can be easily moved into or out of the slot, thereby blocking the gap between the outer sealing ring and the transmission plate, thereby improving its sealing performance.

[0015] Furthermore, the limiting assembly includes a plurality of positioning columns fixed to one side of the outer sealing ring and a plurality of positioning grooves and recesses opened inside the inner air-sealing connecting ring. The top and bottom of the positioning columns are provided with limiting grooves, and a spring is fixed inside the groove. The bottom end of the spring is connected to a movable block, and the bottom of the movable block is installed with a limiting protrusion extending to the inside of the limiting groove.

[0016] By adopting the above technical solution, when the positioning column moves into the positioning groove, the limiting protrusion will be squeezed and move into the inside of the groove, and the limiting protrusion will push the movable block to move so that the movable block squeezes the spring. When the limiting groove on the positioning column is aligned with the limiting protrusion, the spring recovers its elasticity and stretches, and then pushes the limiting protrusion to move into the limiting groove, thereby limiting the positioning column and improving its stability.

[0017] Furthermore, the number of the grooves is twice that of the positioning grooves, the positioning posts are located inside the positioning grooves, and the positioning posts are adapted to the positioning grooves.

[0018] By adopting the above technical solution, the positioning column can be moved into the interior of the positioning groove or moved out of the positioning column, and the setting of the positioning column can make the bolt hole on the inner air seal connecting ring aligned with the bolt hole on the outer sealing ring, so that the second mounting bolt can be screwed into the bolt hole and then the outer sealing ring can be limited and fixed.

[0019] Furthermore, the limiting protrusion is adapted to the limiting groove, the limiting protrusion is slidably connected to the groove via a movable block, and the diameter of the limiting protrusion is smaller than the diameter of the groove.

[0020] By adopting the above technical solution, the limiting protrusion can be moved into the limiting groove to limit the positioning column and prevent the positioning column from moving out of the positioning groove at will.

[0021] In summary, the present invention mainly has the following beneficial effects:

[0022] 1. The present invention is provided with a sealing assembly. When the gap between the inner air-seal connecting ring and the outer sealing ring needs to be sealed, the user can rotate the turntable through the handle. The rotation of the turntable drives the screw to rotate, and the rotation of the screw drives the cam to rotate. The rotation of the cam pushes the slide plate downward. The downward movement of the slide plate drives the connecting rod and the sealing ring downward, so that the sealing ring is stuck into the inside of the groove, thereby achieving a seal between the transmission plate and the outer sealing ring, preventing a large gap from being generated between the transmission plate and the outer sealing ring, thereby improving the sealing between the transmission plate and the outer sealing ring, and further improving the use effect of the transmission and the coal mill;

[0023] 2. The present invention provides a limiting assembly. When the outer sealing ring is installed, the positioning post on the outer sealing ring can be moved into the positioning groove. At this time, the limiting protrusion is squeezed and moved into the inside of the groove, and the limiting protrusion pushes the movable block to move, so that the movable block squeezes the spring. When the limiting groove on the positioning post is aligned with the limiting protrusion, the spring recovers its elasticity and stretches to push the limiting protrusion to move into the limiting groove, thereby limiting the positioning post and improving its stability, so that the inner air-sealing connecting ring and the outer sealing ring can be completely fitted together, and the bolt holes on the inner air-sealing connecting ring can be aligned with the bolt holes on the outer sealing ring, so that the second mounting bolt can be quickly screwed into the corresponding bolt hole, thereby improving the fixing efficiency of the outer sealing ring and preventing the outer sealing ring from moving during installation. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the overall front cross-sectional structure of the present invention;

[0025] Figure 2 This is a schematic diagram of the three-dimensional structure of the outer sealing ring of the present invention;

[0026] Figure 3 It is a schematic diagram of the three-dimensional structure of the sealing ring of the present invention;

[0027] Figure 4 It is a schematic diagram of the cam three-dimensional structure of the present invention;

[0028] Figure 5 For the present invention Figure 1 Enlarged view of point A in the middle;

[0029] Figure 6 For the present invention Figure 1 Enlarged view of point B in the middle.

[0030] In the figure: 1. transmission plate; 2. carbon sealing ring; 3. inner air seal connecting ring; 4. outer sealing ring; 5. first mounting bolt; 6. second mounting bolt; 7. notch; 8. sealing assembly; 801. cavity; 802. bearing; 803. cam; 804. screw; 805. turntable; 806. slide plate; 807. slide groove; 808. return spring; 809. connecting rod; 810. sealing ring; 9. limiting assembly; 901. groove; 902. spring; 903. movable block; 904. limiting protrusion; 905. limiting groove; 906. positioning groove; 907. positioning column; 10. sealed air chamber. DETAILED DESCRIPTION

[0031] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be understood as limiting the present invention.

[0032] The following describes an embodiment of the present invention based on its overall structure.

[0033] A gas seal device in the lower frame of a medium-speed coal mill, such as Figure 1 、 Figure 2 and Figure 6 As shown, it includes a transmission plate 1, a carbon sealing ring 2 is installed below the outer surface of the transmission plate 1, an inner gas seal connecting ring 3 is installed on the top of the carbon sealing ring 2 through a first mounting bolt 5, and four outer sealing rings 4 are installed on the outer wall of the inner gas seal connecting ring 3 through a plurality of second mounting bolts 6. The first mounting bolt 5 can fix the inner gas seal connecting ring 3, and the setting of the second mounting bolt 6 can enable the outer sealing ring 7 to be installed on the outer wall of the carbon sealing ring 2. A limiting component 9 is set between the inner gas seal connecting ring 3 and the outer sealing ring 4, and the limiting component 9 includes a fixed outer sealing ring 4. The multiple positioning posts 907 on one side are connected to the multiple positioning grooves 906 and grooves 901 provided inside the inner gas seal connection ring 3. The top and bottom of the positioning post 907 are provided with limiting grooves 905. The number of grooves 901 is twice that of the positioning grooves 906. The positioning post 907 is located inside the positioning groove 906. The positioning post 907 is adapted to the positioning groove 906. The number of grooves 901 is twice that of the positioning groove 906. The positioning post 907 is located inside the positioning groove 906. The positioning post 907 is adapted to the positioning groove 906. A spring is fixed inside the groove 901. 902, the bottom end of the spring 902 is connected to a movable block 903. When the positioning column 907 moves into the positioning groove 906, the limiting protrusion 904 is squeezed and moves into the inside of the groove 901, and the limiting protrusion 904 pushes the movable block 903 to move, so that the movable block 903 squeezes the spring 902. When the limiting groove 905 on the positioning column 907 is aligned with the limiting protrusion 904, the spring 902 recovers its elasticity and stretches, and then pushes the limiting protrusion 904 to move into the limiting groove 905, thereby limiting the positioning column 907. The movable block 903 The bottom of 03 is equipped with a limiting protrusion 904 extending to the inside of the limiting groove 905. The limiting protrusion 904 is adapted to the limiting groove 905. The limiting protrusion 904 is slidingly connected to the groove 901 through the movable block 903. The diameter of the limiting protrusion 904 is smaller than the diameter of the groove 901, so that the limiting protrusion 904 can be moved into the inside of the limiting groove 905 to limit the positioning column 907. A notch 7 is provided on the top of the outer sealing ring 4, and sealing components 8 are provided around the bottom of the transmission disk 1. A sealed air chamber 10 is provided between the inner air-sealing connecting ring 3 and the transmission disk 1.

[0034] See Figure 1 、 Figure 3 、 Figure 4 and Figure 5806 is fixed to the outer wall of the screw 804, and a cam 803 is sleeved on the outer wall of the screw 804. Slide grooves 807 are provided on both sides of the cavity 801, and a slide plate 806 is provided between the two slide grooves 807. A return spring 808 is fixed to the lower part of the slide groove 807, and the top of the return spring 808 is connected to the slide plate 806. The sealing ring 810 and the connecting rod 809 are slidably connected to the slide groove 807 through the slide plate 806. When the slide plate 806 moves downward, the connecting rod 809 and the sealing ring 810 are driven downward. The cam 803 is located just above the slide plate 806, and a handle is fixed on the upper side of the rotary disk 805. The screw 80 4 is threadedly connected to the transmission disc 1, and the user can rotate the turntable 805 through the turn handle. When the turntable 805 rotates, it will drive the screw 804 to rotate. When the screw 804 rotates, it will drive the cam 803 to rotate. When the cam 803 rotates, it pushes the slide plate 806 to move downward. A plurality of connecting rods 809 are fixed to the bottom of the slide plate 806. When it is necessary to seal the gap between the transmission disc 1 and the outer sealing ring 4, the user can rotate the cam 803 through the turntable 805, so that the slide plate 806 drives the sealing ring 810 to move downward, and then the sealing ring 810 can be snapped into the inside of the notch 7. The bottom end of the connecting rod 809 is fixed with a sealing ring 810, which is located just above the notch 7. The sealing ring 810 is adapted to the notch 7, which makes it easy for the sealing ring 810 to move into or out of the notch 7, thereby blocking the gap between the outer sealing ring 4 and the transmission disc 1.

[0035] The implementation principle of this embodiment is as follows: first, the user can install the inner air seal connecting ring 3 on the carbon sealing ring 2 through the first mounting bolt 5, and then when installing the outer sealing ring 4, the positioning column 907 on the outer sealing ring can be moved into the positioning groove 906. At this time, the limiting protrusion 904 is squeezed and moved into the inside of the groove 901, and the limiting protrusion 904 pushes the movable block 903 to move, so that the movable block 903 squeezes the spring 902. When the limiting groove 905 on the positioning column 907 is aligned with the limiting protrusion 904, the spring 902 recovers its elasticity and stretches, and then pushes the limiting protrusion 904 to move into the limiting groove 905, thereby limiting the positioning column 907. The bolt holes on the inner air seal connecting ring 3 can be aligned with the bolt holes on the outer sealing ring 4, and then the second mounting bolts 6 can be quickly screwed into the corresponding bolt holes to fix the outer sealing ring 4. Then the user rotates the turntable 805 through the handle. When the turntable 805 rotates, it will drive the screw 804 to rotate. When the screw 804 rotates, it will drive the cam 803 to rotate. When the cam 803 rotates, it pushes the slide 806 downward. When the slide 806 moves downward, it will drive the connecting rod 809 and the sealing ring 810 to move downward, so that the sealing ring 810 is stuck into the inside of the slot 7, so as to achieve sealing between the transmission disk 1 and the outer sealing ring 4, and prevent a large gap from being generated between the transmission disk 1 and the outer sealing ring 4.

[0036] Although an embodiment of the present invention has been shown and described, this specific embodiment is merely an explanation of the present invention and is not a limitation of the invention. The specific features, structures, materials or characteristics described may be combined in an appropriate manner in any one or more embodiments or examples. After reading this specification, those skilled in the art may make modifications, substitutions and variations to the embodiment without creative contribution as needed without departing from the principles and purpose of the present invention. However, as long as they are within the scope of the claims of the present invention, they are protected by patent law.

Claims

1. A gas seal device in the lower frame of a medium-speed coal mill, comprising a transmission plate (1), characterized in that: A carbon sealing ring (2) is installed below the outer surface of the transmission disc (1), an inner gas-sealing connecting ring (3) is installed on the top of the carbon sealing ring (2) via a first mounting bolt (5), four outer sealing rings (4) are installed on the outer wall of the inner gas-sealing connecting ring (3) via a plurality of second mounting bolts (6), a limiting assembly (9) is provided between the inner gas-sealing connecting ring (3) and the outer sealing ring (4), a notch (7) is provided on the top of the outer sealing ring (4), a sealing assembly (8) is provided around the bottom of the transmission disc (1), a sealed air chamber (10) is provided between the inner gas-sealing connecting ring (3) and the transmission disc (1), the sealing assembly (8) includes a cavity (801) provided around the bottom of the transmission disc (1), a bearing (802) is installed on one side of the interior of the cavity (801), and one end of the bearing (802) is connected to a screw (801) extending to the outside of the transmission disc (1). 4), a turntable (805) is fixed to one end of the screw (804), a cam (803) is sleeved on the outer wall of the screw (804), a slide groove (807) is provided on both sides of the cavity (801), a slide plate (806) is provided between the two slide grooves (807), a return spring (808) is fixed to the lower part of the inner part of the slide groove (807), a plurality of connecting rods (809) are fixed to the bottom of the slide plate (806), a sealing ring (810) is fixed to the bottom end of the connecting rod (809), the top end of the return spring (808) is connected to the slide plate (806), the sealing ring (810) and the connecting rod (809) are both slidably connected to the slide groove (807) through the slide plate (806), the cam (803) is located directly above the slide plate (806), a rotating handle is fixed to the upper side of one side of the turntable (805), and the screw (804) is threadedly connected to the transmission disk (1).

2. The gas seal device in the lower frame of a medium-speed coal mill according to claim 1, characterized in that: The sealing ring (810) is located directly above the notch (7), and the sealing ring (810) is adapted to the notch (7).

3. The gas seal device in the lower frame of a medium-speed coal mill according to claim 1, characterized in that: The limiting assembly (9) includes a plurality of positioning columns (907) fixed to one side of the outer sealing ring (4) and a plurality of positioning grooves (906) and a groove (901) provided inside the inner air-sealing connecting ring (3). The top and bottom of the positioning columns (907) are provided with limiting grooves (905). A spring (902) is fixed inside the groove (901). The bottom end of the spring (902) is connected to a movable block (903). The bottom of the movable block (903) is provided with a limiting protrusion (904) extending into the limiting groove (905).

4. The gas seal device in the lower frame of a medium-speed coal mill according to claim 3, characterized in that: The number of the grooves (901) is twice that of the positioning grooves (906), and the positioning posts (907) are located inside the positioning grooves (906), and the positioning posts (907) are adapted to the positioning grooves (906).

5. The gas seal device in the lower frame of a medium-speed coal mill according to claim 3, characterized in that: The limiting protrusion (904) is adapted to the limiting groove (905), the limiting protrusion (904) is slidably connected to the groove (901) via the movable block (903), and the diameter of the limiting protrusion (904) is smaller than the diameter of the groove (901).

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