A stepped sealing structure for the rotating shafts of a double-shaft crusher

Abstract

The present invention belongs to the technical field of shaft seals, and particularly relates to a stepped seal structure for the rotating shafts of a double-shaft crusher, which includes an upper material blocking plate and a lower material blocking plate in a shackle structure. The upper material blocking plate includes a first baffle and a second baffle, and the lower material blocking plate includes a third baffle and a fourth baffle. The second baffle is fixedly arranged on the left side of the first baffle in parallel through two arc-shaped bosses, and the fourth baffle is fixedly arranged on the left side of the third baffle in parallel through a U-shaped rib plate. A round nut is arranged on the rotating shaft, and a shaft sleeve is arranged on the left side of the external thread. The first and third baffles are aligned and rotatably arranged on the outside of the round nut. The fourth baffle is arranged on the left side of the second baffle in a staggered and overlapping manner and is rotatably arranged on the outside of the shaft sleeve. This stepped seal structure is sleeved on the outside of the two rotating shafts of the double-shaft crusher to form multiple partitions for sealing, preventing the leakage of the crusher from escaping along the rotating shafts to the bearings of the crusher's rotating shafts, avoiding the occurrence of operating failures of the bearings, and improving the service life of the bearings.

Description

Technical Field

[0001] The invention belongs to the technical field of shaft seals, and particularly relates to a stepped seal structure for a rotating shaft of a double-shaft crusher. Background Art

[0002] A shaft seal is a device for solving the sealing problem between a rotating shaft and a machine body. There are rotating shafts on many devices. The rotating shaft is generally rotatably connected to the machine body through bearings, and accordingly, a shaft seal structure is also required. For example, a medical waste crusher uses the heat of steam, the thermal effect of microwaves, and biological effects to kill microorganisms in medical waste. A medical waste crusher generally adopts a double-shaft crusher. The existing shaft seal effect of the double-shaft crusher is not ideal enough. During the crushing process, medical waste particles and evaporated moisture will ooze out through the rotating shaft, thereby affecting the service life of the bearings, increasing the failure rate and maintenance cost of the crusher, and reducing the working efficiency of the crusher. Therefore, it is very necessary to further improve and perfect the existing shaft seal structure. Summary of the Invention

[0003] In view of the above situation, the invention designs a stepped seal structure for a rotating shaft of a double-shaft crusher, which can greatly improve the sealing effect between the rotating shaft of the equipment and the machine body.

[0004] In order to achieve the above purposes, the invention adopts the following technical solutions:

[0005] A stepped seal structure for a rotating shaft of a double-shaft crusher includes two rotating shafts of the double-shaft crusher and a sealing device arranged outside the two rotating shafts. Bearings are arranged in a matching manner between the two rotating shafts and the machine body of the double-shaft crusher. The sealing device includes an upper blanking plate and a lower blanking plate which are arranged in a clamping manner in a shackle structure. The upper blanking plate includes a first baffle and a second baffle. The lower blanking plate includes a third baffle and a fourth baffle. Two semi-circular notches for fitting and accommodating the rotating shaft are respectively formed on the four baffles. An arc boss is fixedly arranged on the left side of each of the two semi-circular notches of the first baffle. The second baffle is fixedly arranged on the left side of the first baffle in parallel through the two arc bosses. A U-shaped rib plate is vertically fixedly arranged on the left side in the middle of the two semi-circular notches of the third baffle. The fourth baffle is fixedly arranged on the left side of the third baffle in parallel through the U-shaped rib plate. A U-shaped card slot for clamping the third baffle is formed in the middle of the U-shaped rib plate. An external thread is fixedly arranged on the outer side of the shaft end of the rotating shaft. A round nut is arranged in a matching manner on the external thread. A first shaft shoulder for positioning the round nut is arranged on the rotating shaft in a matching manner. A shaft sleeve is arranged on the left side of the external thread. A second shaft shoulder for the shaft sleeve is arranged on the rotating shaft in a matching manner. The first baffle and the third baffle are arranged in alignment in the direction perpendicular to the axis of the rotating shaft. The first baffle and the third baffle are rotatably arranged on the outer side of the round nut. The second baffle and the fourth baffle are arranged in a staggered manner. The fourth baffle is located on the left side of the second baffle, and an overlapping part is arranged on the inner side edges of the fourth baffle and the second baffle. The second baffle and the fourth baffle are rotatably arranged on the outer side of the shaft sleeve.

[0006] Further, first side plates and second side plates are vertically and fixedly connected to the front and rear ends of the left side of the first baffle respectively. A reinforcing rib plate is vertically arranged in the middle of the first baffle, and the reinforcing rib plate is directly above the U-shaped rib plate. An upper cover plate is cooperatively arranged above the first side plates, the second side plates and the reinforcing rib plate.

[0007] Further, third side plates and fourth side plates are vertically and fixedly connected to the front and rear ends of the left side of the third baffle respectively. The third side plates and the fourth side plates are aligned and spliced with the first side plates and the second side plates respectively. The bottoms of the upper blanking plate and the lower blanking plate are both provided with openings.

[0008] Further, mounting holes for bolt connection with the body of the double-shaft crusher are formed in the first side plates, the second side plates, the third side plates and the fourth side plates. The upper blanking plate and the lower blanking plate are detachably connected to the body of the double-shaft crusher through mounting bolts respectively.

[0009] Further, the bearing is press-fitted on the rotating shaft. The bearing is located on the left side of the sleeve, and the right side edge of the bearing abuts tightly against the sleeve.

[0010] Further, a collar is coaxially and fixedly arranged on the outer side of the sleeve, which serves as a partition wall to prevent the leaked medical waste particles or condensed water droplets from continuing to move leftward along the sleeve.

[0011] Further, a chamfer is arranged on the left edge of the round nut to guide the leaked medical waste particles or condensed water droplets to drip by gravity.

[0012] Further, the round nut rotates synchronously with the rotating shaft. The upper blanking plate is fixedly connected to the body of the double-shaft crusher. The inner edges of the semicircular notches of the first baffle and the third baffle are in sliding contact with the outer side wall of the round nut.

[0013] Further, the sleeve is press-fitted on the rotating shaft. The sleeve rotates synchronously with the rotating shaft. The lower blanking plate is fixedly connected to the body of the double-shaft crusher. The inner edges of the semicircular notches of the second baffle and the fourth baffle are in sliding contact with the outer side wall of the sleeve.

[0014] The present invention further includes other settings that enable its normal use, which are all conventional means in the art. In addition, the devices or components not defined in the present invention, such as the body of the double-shaft crusher, the rotating shaft, the bearing, the round nut and the sleeve, etc., all adopt the existing technologies in the art.

[0015] The beneficial effects of the present invention are as follows:

[0016] The stepped sealing structure of the rotating shafts of the double-shaft crusher provided by the present invention is formed by splicing two material-blocking plates up and down by means of a locking structure, and is sleeved outside the two rotating shafts of the double-shaft crusher to form multiple partitions for sealing, preventing the leakage of the crusher from escaping along the rotating shafts to the bearings of the rotating shafts of the crusher, avoiding the occurrence of operating failures of the bearings, and improving the service life of the bearings. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic view of the stepped sealing structure of the rotating shafts of the double-shaft crusher in the embodiment.

[0018] Figure 2 For Figure 1 It is a schematic cross-sectional structure view of the stepped sealing structure of the rotating shafts of the double-shaft crusher in

[0019] Figure 3 For Figure 1 It is a schematic three-dimensional structure view of the upper material-blocking plate in

[0020] Figure 4 For Figure 1 It is a schematic three-dimensional structure view of the lower material-blocking plate in DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] Next, the technical solutions of the present invention will be clearly and completely described in conjunction with specific embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all embodiments.

[0022] It should be noted that the orientation or position terms such as "upper", "lower", "left", "right", "front", "rear", "inner", "outer", "middle", etc. are all based on the drawings shown, only for the convenience of description.

[0023] Embodiment

[0024] As Figure 1-2 shown, a stepped sealing structure of the rotating shafts of a double-shaft crusher includes two rotating shafts 1 of the double-shaft crusher and a sealing device arranged outside the two rotating shafts. Bearings 2 are arranged in a matching manner between the two rotating shafts and the body of the double-shaft crusher. The sealing device includes an upper material-blocking plate and a lower material-blocking plate that are clamped in a locking structure. The upper material-blocking plate includes a first baffle 3 and a second baffle 4. The lower material-blocking plate includes a third baffle 5 and a fourth baffle 6. Two semi-circular notches 7 for fitting and accommodating the rotating shafts are respectively formed on the four baffles. The upper and lower material-blocking plates are clamped and spliced towards the rotating shafts. The semi-circular notches of the upper and lower material-blocking plates are correspondingly spliced into two shaft-passing circular holes. The two rotating shafts respectively pass through the two shaft-passing circular holes in the middle of the two material-blocking plates.

[0025] As Figure 3-4As shown, on the left side of each of the two semi-circular notches of the first baffle, an arc-shaped convex platform 8 is fixedly fitted. The second baffle is fixedly arranged on the left side of the first baffle in parallel through the two arc-shaped convex platforms. On the left side of the middle of the two semi-circular notches of the third baffle, a U-shaped rib plate 9 is vertically fixed. The fourth baffle is fixedly arranged on the left side of the third baffle in parallel through the U-shaped rib plate. A U-shaped card slot for clamping the third baffle is provided in the middle of the U-shaped rib plate. An external thread is fixedly provided on the outer side of the shaft end of the rotating shaft. A round nut 10 is arranged in cooperation with the external thread. A first shaft shoulder for positioning the round nut is arranged in cooperation on the rotating shaft. A shaft sleeve 19 is arranged on the left side of the external thread. A second shaft shoulder for the shaft sleeve is arranged in cooperation on the rotating shaft. The first baffle and the third baffle are arranged in alignment in the direction perpendicular to the axis of the rotating shaft. The first baffle and the third baffle are rotatably arranged on the outer side of the round nut. The second baffle and the fourth baffle are arranged in a staggered manner. The fourth baffle is located on the left side of the second baffle, and an overlapping part is provided at the inner edge of the fourth baffle and the second baffle. The second baffle and the fourth baffle are rotatably arranged on the outer side of the shaft sleeve.

[0026] The round nut, the first baffle and the third baffle form a first seal, which tries to prevent the leakage of medical waste particles, steam condensate water droplets and other leakage substances in the double-shaft crusher from passing through the first seal. Even if a small amount of leakage substances are squeezed into the semi-closed area on the left side of the first baffle and the third baffle by external force, the leakage substances will drip along the chamfer of the round nut under the action of their own gravity; the second baffle, the fourth baffle and the shaft sleeve form a second seal to further prevent the leakage substances from passing through; the second baffle and the fourth baffle are arranged in a staggered manner and have a certain height difference, which can prevent the leakage substances from splashing upwards with the rotation of the rotating shaft, so that the leakage substances fall along the second baffle and the fourth baffle, forming a third seal; a shaft collar is provided on the shaft sleeve, forming a fourth seal, so that a very small amount of leakage substances passing through the first three seals finally fall along the fourth baffle, effectively protecting the safe operation of the shaft end bearing and maximizing the service life of the bearing.

[0027] At the front and rear ends on the left side of the first baffle, a first side plate 11 and a second side plate 12 are vertically fixedly connected respectively. A reinforcing rib plate 13 is vertically arranged in the middle of the first baffle. The reinforcing rib plate is located directly above the U-shaped rib plate. An upper cover plate 14 is arranged in cooperation above the first side plate, the second side plate and the reinforcing rib plate.

[0028] At the front and rear ends on the left side of the third baffle, a third side plate 15 and a fourth side plate 16 are vertically fixedly connected respectively. The third side plate and the fourth side plate are respectively aligned and spliced with the first side plate and the second side plate. The bottoms of the upper blanking plate and the lower blanking plate are both open, forming two semi-closed areas on the left sides of the first baffle and the third baffle and on the left sides of the second baffle and the fourth baffle respectively.

[0029] The first side plate, the second side plate, the third side plate and the fourth side plate are all provided with mounting holes 17 for bolt connection with the body of the double-shaft crusher, and the upper material blocking plate and the lower material blocking plate are each detachably connected to the body of the double-shaft crusher through mounting bolts.

[0030] The bearing is press-fitted on the rotating shaft, the bearing is located on the left side of the bushing, and the right side of the bearing abuts tightly against the bushing.

[0031] An axle collar 18 is also coaxially fixed on the outer side of the bushing, which functions as a partition wall to prevent the leaked material or condensed water droplets from continuing to move leftward along the bushing.

[0032] The round nut rotates synchronously with the rotating shaft, the upper material blocking plate is fixedly connected to the body of the double-shaft crusher, and the inner edges of the semi-circular notches of the first baffle and the third baffle are in sliding contact with the outer side wall of the round nut.

[0033] The bushing is press-fitted on the rotating shaft, the bushing rotates synchronously with the rotating shaft, the lower material blocking plate is fixedly connected to the body of the double-shaft crusher, and the inner edges of the semi-circular notches of the second baffle and the fourth baffle are in sliding contact with the outer side wall of the bushing.

[0034] The technical solution of the present invention is not limited to the limitations of the above specific embodiments. Without departing from the scope and spirit of the described embodiments, many modifications and changes are obvious to those of ordinary skill in the art. Any technical deformation made within the spirit and principle of the present invention falls within the protection scope of the present invention.

Claims

1. A stepped sealing structure for the rotating shafts of a double-shaft crusher, comprising two rotating shafts of the double-shaft crusher and a sealing device arranged outside the two rotating shafts. Bearings are arranged in a matching manner between the two rotating shafts and the body of the double-shaft crusher. It is characterized in that: The sealing device includes an upper blanking plate and a lower blanking plate which are arranged in a clamp structure like a yoke. The upper blanking plate includes a first baffle and a second baffle, and the lower blanking plate includes a third baffle and a fourth baffle. Two semi-circular notches for fitting and accommodating the rotating shaft are respectively formed on each of the four baffles. On the left side of each of the two semi-circular notches of the first baffle, an arc convex platform is fixedly provided in cooperation. The second baffle is fixedly arranged on the left side of the first baffle in parallel through the two arc convex platforms. On the left side in the middle of the two semi-circular notches of the third baffle, a U-shaped rib plate is vertically fixedly provided. The fourth baffle is fixedly arranged on the left side of the third baffle in parallel through the U-shaped rib plate. A U-shaped card slot for clamping the third baffle is formed in the middle of the U-shaped rib plate. An external thread is fixedly provided on the outer side of the shaft end of the rotating shaft, and a round nut is arranged in cooperation on the external thread. A first shaft shoulder for positioning the round nut is arranged in cooperation on the rotating shaft. A shaft sleeve is arranged on the left side of the external thread. A second shaft shoulder for the shaft sleeve is arranged in cooperation on the rotating shaft. The first baffle and the third baffle are arranged in alignment in the direction perpendicular to the axis of the rotating shaft. The first baffle and the third baffle are rotatably arranged on the outer side of the round nut. The second baffle and the fourth baffle are arranged in a staggered manner. The fourth baffle is located on the left side of the second baffle, and an overlapping part is provided at the inner edges of the fourth baffle and the second baffle. The second baffle and the fourth baffle are rotatably arranged on the outer side of the shaft sleeve; at the front and rear ends on the left side of the first baffle, a first side plate and a second side plate are respectively vertically fixedly connected. A reinforcing rib plate is vertically arranged in the middle of the first baffle. The reinforcing rib plate is located directly above the U-shaped rib plate. An upper cover plate is arranged in cooperation above the first side plate, the second side plate and the reinforcing rib plate; at the front and rear ends on the left side of the third baffle, a third side plate and a fourth side plate are respectively vertically fixedly connected. The third side plate and the fourth side plate are respectively spliced in alignment with the first side plate and the second side plate; mounting holes for bolt connection with the body of the double-shaft crusher are formed on the first side plate, the second side plate, the third side plate and the fourth side plate; the bearing is sleeved on the rotating shaft by interference fit, and the bearing is located on the left side of the shaft sleeve.

2. The stepped seal structure of the rotating shaft of a double-shaft crusher according to claim 1, characterized in that: An axle collar is also coaxially fixedly provided on the outer side of the shaft sleeve.

3. A stepped sealing structure for the rotating shaft of a double-shaft crusher according to claim 1, characterized in that: A chamfer is provided at the left edge of the round nut.

4. A dual-shaft crusher rotating shaft echelon sealing structure according to claim 1, characterized in that: The inner edges of the semi-circular notches of the first baffle and the third baffle are in sliding contact with the outer side wall of the round nut.

5. A stepped sealing structure for the rotating shaft of a double-shaft crusher according to claim 1, characterized in that: The inner edges of the semi-circular notches of the second baffle and the fourth baffle are in sliding contact with the outer side wall of the shaft sleeve.

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