Shaft end sealing device of double-geared roller crusher
By using a labyrinthine gap channel design in a combined sealing structure, the problems of insufficient dynamic adaptability and anti-pollution ability of traditional sealing structures are solved. This enables gap adjustment and improved sealing performance of the crushing roller spindle, extends equipment service life, and reduces maintenance costs.
Patent Information
- Application Number
- CN202520671383.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-10
- Publication Date
- 2026-02-27
- Estimated Expiration
- 2035-04-10
AI Technical Summary
The shaft end sealing structure of traditional double toothed roll crushers is insufficient in terms of dynamic adaptability, anti-pollution ability and maintenance cost. It cannot effectively prevent dust and moisture from entering, which leads to accelerated bearing wear and affects equipment stability and production efficiency.
The combined sealing structure, including an eccentric bearing cup, a through cover, and a dynamic sealing ring, forms a labyrinth-type gap channel to achieve radial horizontal displacement adjustment of the crushing roller main shaft. It also extends the flow path of dust particles or fluids through a non-contact labyrinth gap seal connection, preventing fine particles from entering the bearing cavity.
This technology enables dynamic adjustment of the gap between the crushing roller spindles, reducing the risk of seal failure, extending equipment lifespan, reducing bearing wear, lowering maintenance costs, and improving equipment stability and production efficiency.
Smart Images
Figure CN223953245U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to double toothed roll crusher technical field, concretely is a kind of double toothed roll crusher shaft end sealing device. BACKGROUND
[0002] As the key equipment of material crushing and fine crushing in mining, metallurgy, building materials and other industries, the core component double toothed roll of double toothed roll crusher realizes extrusion shearing and crushing to material by high-speed relative rotation.In actual operation, the dynamic sealing performance between the two ends of the crusher roll shaft and the bearing seat directly affects the reliability of the equipment, if the sealing fails, not only will it cause resource waste due to lubricating oil leakage, but also may cause the bearing cavity to be invaded by external dust, water vapor or particulate matter, accelerate the wear of the bearing and even be stuck, seriously threaten the stability of continuous operation of the equipment;In addition, double toothed roll crusher usually has the demand of adjusting the distance between the two crushing roll shafts in the field, the traditional shaft end sealing scheme usually cannot realize the radial horizontal displacement adjustment of the two crushing roll shafts, and mostly adopts single sealing structure, and generally has the following defects:one is that the dynamic adaptability is insufficient, the crushing roll shaft is prone to axial movement and radial jump under high-speed rotation and material impact, leading to the change of the gap of rigid sealing element, causing the sealing surface to wear out, and the risk of sealing failure significantly increases after long-term use;Two is that the anti-pollution ability is weak, the crushing operation environment generally exists high dust concentration and humid working condition, and the traditional single-layer sealing structure is difficult to effectively block the invasion of fine particles, especially when the equipment is stopped, the negative pressure effect is easy to suck in dust, forming a vicious cycle of particle wear;Three is that the maintenance cost is high, frequent replacement of sealing element will lead to increased downtime, and the disassembly of part of split type sealing structure needs to disassemble the bearing seat, the maintenance process is complex, and directly affects the production efficiency.
[0003] Therefore, the utility model provides a kind of double toothed roll crusher shaft end sealing device of combined sealing structure, can realize the radial horizontal displacement adjustment of crushing roll shaft, and can solve the shortcomings of the above single sealing structure. UTILITY MODEL CONTENTS
[0004] The utility model adopts the following technical scheme: a kind of double toothed roll crusher shaft end sealing device, including the bearing seat of fixed installation on the shell of crusher, eccentric bearing cup is fixedly covered on bearing seat, the inside of eccentric bearing cup is equipped with the bearing rotationally connected with the shaft end of crusher, and the inner end face of eccentric bearing cup is equipped with eccentric cover, and the outer end face of eccentric bearing cup is equipped with cover, and the outer end face of eccentric cover is equipped with the dynamic sealing ring of rotationally connected, and dynamic sealing ring is fixedly covered with the inside of the shaft end of crusher;Cover is rotationally covered with shaft sleeve, and shaft sleeve is fixedly covered with the outside of the shaft end of crusher, and bearing is located between eccentric cover and shaft sleeve, wherein: the outer end face of eccentric cover is equipped with multiple annular grooves, the inner end face of dynamic sealing ring is equipped with multiple annular protrusions position adaptation with annular groove, annular protrusion clearance fit is nested in annular groove, and forms labyrinth gap channel.
[0005] Further, the eccentric bearing cup comprises a cylindrical cup body, a through eccentric inner hole is arranged eccentrically along the axial length direction of the cylindrical cup body, and the vertical distance h between the center A of the eccentric inner hole and the center B of the cylindrical cup body is 20 mm-30 mm.
[0006] Further, the eccentric bearing cup further comprises a bearing cup outer ring which is arranged on the outer end surface of the cylindrical cup body and extends outward in the circumferential direction, the bearing cup outer ring is coaxially arranged with the cylindrical cup body, a plurality of first bolt holes are arranged at equal intervals in the circumferential direction at the position close to the edge of the bearing cup outer ring, and the bearing cup outer ring is fixedly connected with the bearing seat through the plurality of first bolts which pass through the first bolt holes.
[0007] Further, the eccentric cover is provided with a cover eccentric hole which is coaxial with the eccentric inner hole, a plurality of second bolt holes are arranged at equal intervals in the circumferential direction at the position close to the edge of the eccentric cover, and the eccentric cover is fixedly connected with the inner end surface of the cylindrical cup body through the plurality of second bolts which pass through the second bolt holes.
[0008] Further, the inner peripheral wall of the cover eccentric hole is provided with a dustproof ring and a first felt ring at intervals, the dustproof ring is close to the outer end surface of the eccentric cover, and the dustproof ring and the first felt ring are both in sealing contact with the outer side wall of the crusher shaft end.
[0009] Further, the cover is provided with a cover through hole through which the shaft sleeve passes, the cover through hole is arranged in the center, a plurality of third bolt holes are arranged at equal intervals in the circumferential direction at the position close to the edge of the cover, and the cover is fixedly connected with the outer end surface of the bearing cup outer ring through the plurality of third bolts which pass through the third bolt holes.
[0010] Further, the inner peripheral wall of the cover through hole is provided with a rotating shaft double-lip sealing ring and a second felt ring at intervals, the second felt ring is close to the outer end surface of the cover, and the second felt ring and the rotating shaft double-lip sealing ring are both in sealing contact with the outer side wall of the shaft sleeve.
[0011] Further, the inner end surface of the eccentric cover is provided with an annular abutting portion which is in abutment with the bearing, and a plurality of first oil injection holes are arranged on the outer side wall of the annular abutting portion, a second oil injection hole which is communicated with the first oil injection hole is arranged on the cylindrical cup body, and the second oil injection hole is connected with an external oil injection pipe.
[0012] Further, the bearing is a self-aligning roller bearing.
[0013] Compared with the prior art, the utility model has the advantages that:
[0014] The utility model discloses a double-toothed roll crusher shaft end sealing device, through rotating eccentric bearing cup, makes eccentricity transparent cover drive dynamic sealing ring rotation, further drive crusher shaft end rotation to change the adjustment of radial horizontal displacement of crushing roll main shaft, realize the clearance adjustment between two crushing roll main shafts, satisfy the demand of double-toothed roll crusher discharge particle size adjustment, through the non - contact labyrinth gap sealing connection between dynamic sealing ring and eccentricity transparent cover, realize the dynamic sealing of crusher shaft end in axial or radial direction, avoided the wear and tear of sealing surface between dynamic sealing ring and eccentricity transparent cover, reduced the risk of sealing device failure, the labyrinth gap channel prolonged the circulation path of dust particle or fluid simultaneously, effectively blocked the invasion of fine particle in crushing operation environment into the inner chamber of eccentric bearing cup, reduced the possibility of bearing wear and tear, prolonged the service life of double-toothed roll crusher. BRIEF DESCRIPTION OF DRAWINGS
[0015] In order to more clearly illustrate the technical scheme in the embodiment of the utility model or prior art, below will to the embodiment or prior art description needed to use the drawing simple introduction, obviously, below description in the drawing only some embodiments of the utility model, for those skilled in the art, under the premise of not paying creative labor, can also obtain other drawings according to these drawings.
[0016] Figure 1 It is the front view cross section structure schematic drawing of the utility model double-toothed roll crusher shaft end sealing device;
[0017] Figure 2 It is the three-dimensional structure schematic drawing of the utility model double-toothed roll crusher shaft end sealing device removal bearing seat;
[0018] Figure 3 It is the utility model Figure 1 It is the local structure enlarged view of the utility model C place;
[0019] Figure 4 It is the utility model Figure 1 It is the local structure enlarged view of the utility model D place;
[0020] Figure 5 It is the right view structure schematic drawing of the utility model eccentric bearing cup;
[0021] Figure 6 It is the front view cross section structure schematic drawing of the utility model eccentric bearing cup;
[0022] Figure 7 It is the left view structure schematic drawing of the utility model eccentricity transparent cover;
[0023] Figure 8 It is the front view cross section structure schematic drawing of the utility model eccentricity transparent cover;
[0024] Figure 9It is the three-dimensional structure schematic view of the dynamic sealing ring in the utility model;
[0025] Figure 10 It is the main view cross section structure schematic view of the dynamic sealing ring in the utility model;
[0026] Figure 11 It is the right view structure schematic view of the transparent cover in the utility model;
[0027] Figure 12 It is the main view cross section structure schematic view of the transparent cover in the utility model;
[0028] 1-bearing seat, 2-eccentric bearing cup, 21-cylindrical cup body, 210-second oil hole, 211-third oil hole, 22-eccentric inner hole, 23-bearing cup outer ring, 24-first bolt hole, 25-first bolt, 3-crusher shaft end, 31-crusher shaft end inner side, 32-crusher shaft end outer side, 4-bearing, 41-fourth oil hole, 5-eccentric transparent cover, 51-annular groove, 52-transparent cover eccentric hole, 53-second bolt hole, 54-second bolt, 55-dustproof ring, 56-first felt ring, 57-annular abutment part, 570-first oil hole, 6-transparent cover, 61-transparent cover through hole, 62-third bolt hole, 63-third bolt, 64-rotary shaft double-lip sealing ring, 65-second felt ring, 7-dynamic sealing ring, 71-annular protrusion, 8-shaft sleeve, 9-screw. DETAILED DESCRIPTION
[0029] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the ordinary skilled in the art without creative work belong to the protection scope of the utility model.
[0030] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the ordinary skilled in the art without creative work belong to the protection scope of the utility model. Figure 1 to the drawings in the utility model, the utility model will be described in detail. Figure 12 and specific embodiments, the utility model is described in detail.
[0031] The utility model provides a kind of double-toothed roll crusher shaft end sealing device, including the bearing seat 1 of fixed installation on the crusher shell body, eccentric bearing cup 2 is fixedly sleeved on bearing seat 1, the inside of eccentric bearing cup 2 is equipped with the bearing 4 being rotatably connected with the crusher shaft end 3, the inner end surface of eccentric bearing cup 2 is equipped with eccentric cover 5, the outer end surface of eccentric bearing cup 2 is equipped with cover 6, the outer end surface of eccentric cover 5 is equipped with the rotating connection dynamic sealing ring 7, dynamic sealing ring 7 and the inside 31 of crusher shaft end fixedly sleeve connect;Cover 6 is rotatably sleeved with shaft sleeve 8, shaft sleeve 8 and the outside 32 of crusher shaft end fixedly sleeve connect, bearing 4 is located between eccentric cover 5 and shaft sleeve 8, wherein: the outer end surface of eccentric cover 5 is equipped with multiple annular grooves 51, the inner end surface of dynamic sealing ring 7 is equipped with multiple annular protrusions 71 with the position adaptation of annular groove 51, annular protrusion 71 clearance fit is nested in annular groove 51, and form labyrinth gap channel.
[0032] In the double-toothed roll crusher, the two crushing roll main shafts are arranged side by side, and the crusher shaft end 3 of each crushing roll main shaft is symmetrically provided with the double-toothed roll crusher shaft end sealing device of the application, wherein the dynamic sealing ring 7 is preferably made of metal and is fixedly connected with the inner side 31 of the crusher shaft end through a plurality of screws 9; the shaft sleeve 8 is fixedly connected with the outer side 32 of the crusher shaft end through hot fitting, and the two ends of the bearing 4 abut against the inner end face of the eccentric bushing 5 and the inner end face of the shaft sleeve 8, respectively; by rotating the eccentric bearing cup 2, the eccentric bushing 5 is rotated, and then the dynamic sealing ring 7 is rotated, since the dynamic sealing ring 7 is fixedly connected with the crusher shaft end 3, the rotation of the dynamic sealing ring 7 changes the radial horizontal position of the crushing roll main shaft, thereby realizing the gap adjustment between the two crushing roll main shafts, and meeting the requirement of adjusting the size of the discharge particle of the double-toothed roll crusher. It should be noted that when the eccentric bearing cup 2 is rotated, the eccentric bearing cups at the two ends of the same crushing roll main shaft need to be rotated as synchronously as possible, if the synchronous adjustment cannot be ensured, one end of the eccentric bearing cup needs to be adjusted by a small distance first, then the other end is changed, and the same small distance is adjusted, and the adjustment is repeated until the predetermined requirement is reached. In the embodiment, the dynamic sealing ring 7 and the eccentric bushing 5 are non-contact labyrinth gap sealing, the annular groove 51 on the outer end face of the eccentric bushing 5 and the annular protrusion 71 on the inner end face of the dynamic sealing ring 7 are both two, which are not limited here, and can be set according to the actual requirement by the person skilled in the art, and the gap between the annular protrusion 71 and the annular groove 51 is 2mm to 3mm; when the double-toothed roll crusher crushes the material, the two crushing roll main shafts rotate under the action of the external transmission device (not shown in the figure), at this time, due to the high-speed rotation of the crushing roll main shaft and the impact of the material, the axial movement and the radial jumping are easily generated, the dynamic sealing of the crusher shaft end 3 in the axial or radial position is realized through the annular protrusion 71 on the inner end face of the dynamic sealing ring 7 and the annular groove 51 on the outer end face of the eccentric bushing 5, the wear of the sealing surface between the dynamic sealing ring 7 and the eccentric bushing 5 is avoided, and the risk of failure of the sealing device is reduced; at the same time, when the dust particles or fluid pass through the narrow and staggered labyrinth gap channel, due to the lengthening of the flow path and the local vortex formation, the kinetic energy of the dust particles or fluid is gradually consumed, and finally the dust particles or fluid are settled or blocked, thereby effectively preventing the fine particles or fluid in the crushing environment from invading the inner cavity of the eccentric bearing cup 2, reducing the possibility of bearing 4 wear, and prolonging the service life of the double-toothed roll crusher.
[0033] Specifically, refer to Figures 1-2 , Figures 5-6In the embodiment, the eccentric bearing cup 2 comprises a cylindrical cup body 21, and a through eccentric inner hole 22 is arranged eccentrically along the length direction of the axis, and the vertical distance h between the center A of the eccentric inner hole 22 and the center B of the cylindrical cup body 21 is 20-30 mm. The eccentric distance of the eccentric bearing cup 2 is designed to be 20-30 mm, so that the efficient and reliable adjustment of the distance between the two crushing rollers in the limited space is realized, and the flexible operation of the small and medium-sized crusher under complex working conditions is especially suitable.
[0034] Specifically, the user Figures 1-2 、 Figures 5-6 In the embodiment, the eccentric bearing cup 2 further comprises a bearing cup outer ring 23 extending outward in the circumferential direction and arranged on the outer end face of the cylindrical cup body 21, the bearing cup outer ring 23 is coaxially arranged with the cylindrical cup body 21, and a plurality of first bolt holes 24 are arranged at equal intervals in the circumferential direction at the position close to the edge of the bearing cup outer ring 23, and the bearing cup outer ring 23 is fixedly connected with the bearing seat 1 through the plurality of first bolts 25 passing through the first bolt holes 24. Preferably, the bearing cup outer ring 23 is integrally formed with the cylindrical cup body 21. In order to facilitate the accurate adjustment of the distance between the two crushing roller shafts, preferably, the number of first bolt holes 24 is twenty-four, and when the equipment is in the initial state, the lowermost end of the bearing cup outer ring 23 is marked as 0, the uppermost end is marked as 12, and the left and right sides are symmetrically arranged as 1, 2, 3, …, 11 from bottom to top. When the distance between the double-toothed roller crusher is adjusted, the first bolt is first removed, then a chain guide or other tools are inserted into the first bolt hole 24, and the crushing roller shaft is rotated by 1-5 hole positions to move radially horizontally. When the first bolt hole is rotated by 6, the eccentric distance is maximum, i.e. 20-30 mm, and the two crushing roller shafts move radially horizontally away from or close to each other. When the first bolt hole is rotated by 12, the eccentric distance is 0 mm, and only the height position of the crushing roller shaft is adjusted, and the radial horizontal position is not changed. When the first bolt hole is rotated by 24, the eccentric bearing cup 2 returns to the original position, and any size is not changed. The present application can accurately control the radial horizontal displacement of the crushing roller shaft by adjusting the rotation angle of the eccentric bearing cup 2, so as to realize the purpose of adjusting the size of the discharged particles.
[0035] Specifically, refer to Figures 1-4 、 Figures 7-8In the embodiment, the eccentric cover 5 is provided with an eccentric hole 52 coaxial with the eccentric inner hole 22, and a plurality of second bolt holes 53 are equidistantly arranged on the circumference of the eccentric cover 5 near the edge. The eccentric cover 5 is fixedly connected with the inner end surface of the cylindrical cup body 21 through the plurality of second bolt holes 53 and the plurality of second bolts 54. The center E of the eccentric hole 52 is coaxial with the center A of the eccentric inner hole 22, and the center F of the eccentric cover 5 is coaxial with the center B of the cylindrical cup body 21. When the eccentric bearing cup 2 rotates, the eccentric hole 52 rotates with the eccentric bearing cup 2, and drives the crusher shaft end 3 fixedly connected with the dynamic sealing ring 7 to rotate, so as to adjust the distance between the two crusher roller shafts.
[0036] Specifically, referring to Figure 1 and Figure 3 In the embodiment, the inner circumferential wall of the eccentric hole 52 of the cover is provided with a dustproof ring 55 and a first felt ring 56. The dustproof ring 55 is close to the outer end surface of the eccentric cover 5, and the first felt ring 56 and the dustproof ring 55 are both in sealing contact with the outer side wall of the crusher shaft end 3. The dustproof ring 55 and the first felt ring 56 on the eccentric cover 5 are in contact sealing connection with the outer side wall of the crusher shaft end 3, which further ensures the sealing performance of the double-toothed roller crusher shaft end sealing device. The dustproof ring 55 close to the outer end surface of the eccentric cover 5 as the first line of defense can effectively intercept dust, debris and other large-particle impurities from entering the inside of the eccentric bearing cup 2. The fiber structure of the first felt ring 56 can store lubricating oil to form an oil film barrier, reduce the friction and wear between the crusher shaft end 3 and the eccentric cover 5, and the first felt ring 56 can intercept fine particles that may penetrate the dustproof ring 55 and prevent internal lubricating grease from leaking outward, maintaining the cleanliness of the lubricating system.
[0037] Specifically, referring to Figures 1-4 , Figures 11-12 In the embodiment, the cover 6 is provided with a cover through hole 61 for the shaft sleeve 8 to pass through, and the cover through hole 61 is centrally arranged. A plurality of third bolt holes 62 are equidistantly arranged on the circumference of the cover 6 near the edge, and the cover 6 is fixedly connected with the outer end surface of the bearing cup outer ring 23 through the plurality of third bolt holes 62 and the plurality of third bolts 63.
[0038] Specifically, referring to Figures 1-2 , Figure 4The inner peripheral wall of the through hole 61 of the transparent cover 6 is provided with a rotating shaft double-lip sealing ring 64 and a second felt ring 65 in the embodiment. The second felt ring 65 is close to the outer end surface of the transparent cover 6, and the second felt ring 65 and the rotating shaft double-lip sealing ring 64 are in sealing contact with the outer side wall of the shaft sleeve 8. The rotating shaft double-lip sealing ring 64 and the second felt ring 65 on the transparent cover 6 are in contact sealing connection with the outer side wall of the shaft sleeve 8. The second felt ring 65 is close to the outer end surface of the transparent cover 6, and the second felt ring 65 contacts the external environment first, adsorbs dust and releases stored grease, lubricates the surface of the shaft sleeve 8, and reduces the friction and wear between the transparent cover 6 and the shaft sleeve 8. The rotating shaft double-lip sealing ring 64 is in close contact with the shaft sleeve 8, which can prevent internal grease from leaking and further block the invasion of particles. The elastic lip of the rotating shaft double-lip sealing ring 64 can compensate for the radial runout of the shaft sleeve 8, and the flexible structure of the second felt ring 65 can absorb high-frequency vibration energy to prevent the sealing surface from separating. The combination of the rotating shaft double-lip sealing ring 64 and the second felt ring 65 realizes the balance of leakage control, dust protection and lubrication maintenance under extreme working conditions through the double mechanism of dynamic sealing and static adsorption.
[0039] Specifically, referring to Figure 1 、 Figure 3 、 Figure 6 and Figure 8 , the inner end surface of the eccentric transparent cover 5 is provided with an annular abutting portion 57 in the embodiment. The annular abutting portion 57 is in abutment with the bearing 4 to form a grease containing cavity, and a plurality of first oil injection holes 570 are provided on the outer side wall of the annular abutting portion 57. The cylindrical cup upper body 21 is provided with a second oil injection hole 210 matched with the first oil injection hole 570, and the second oil injection hole 210 is connected with an external oil injection pipe. The first oil injection hole 570 is a U-shaped opening in the embodiment, and the outer end surface of the annular abutting portion 57 is in abutment with one end surface of the bearing 4. The cylindrical cup upper body 21 is provided with a third oil injection hole 211 above the bearing 4, and the bearing 4 is provided with a fourth oil injection hole 41 communicating with the third oil injection hole 211. When the double-toothed roller crusher is in use, external grease can be injected into the bearing 4 through the third oil injection hole 211 and the fourth oil injection hole 41, which plays a good lubricating effect and prolongs the service life of the bearing 4. The external grease can also be regularly injected into the grease containing cavity between the annular abutting portion 57 and the bearing 4 through the second oil injection hole 210 and the first oil injection hole 570. When the crushing roller shaft rotates, the grease is thrown outward under the action of centrifugal force and fills into the gap between the annular protrusion 71 and the annular groove 51, further preventing external dust from invading through the labyrinth gap channel.
[0040] Specifically, referring to Figures 1-3In the embodiment, the bearing 4 is a self-aligning roller bearing. The self-aligning roller bearing has excellent radial and axial bearing capacity, can self-adaptively align, effectively adjusts the axial movement and radial jumping of the crushing roller spindle under high-speed rotation and material impact, and ensures that the equipment can stably run under various working conditions.
[0041] The utility model is further described above with the help of specific embodiments, but it should be understood that the specific description here should not be understood as the limitation of the essence and scope of the utility model, and various modifications made to the above embodiments by the ordinary skilled in the art after reading the specification all belong to the scope protected by the utility model.
Claims
1. A double roll crusher shaft end seal apparatus characterised in that: The eccentric bearing cup is provided with a plurality of annular grooves on the outer end face, and the inner end face of the dynamic sealing ring is provided with a plurality of annular protrusions matched with the positions of the annular grooves. The eccentric bearing cup comprises a cylindrical cup body, and a through eccentric inner hole is provided in the cylindrical cup body eccentrically along the length direction of the axis.
2. The double roll crusher shaft end seal apparatus as claimed in claim 1, wherein: The eccentric bearing cup further comprises a bearing cup outer ring extending outward in the circumferential direction on the outer end face of the cylindrical cup body, the bearing cup outer ring is coaxially arranged with the cylindrical cup body, and a plurality of first bolt holes are equidistantly arranged in the circumferential direction at the position close to the edge of the bearing cup outer ring.
3. The double roll crusher shaft end seal apparatus as claimed in claim 2, wherein: The eccentric cover is provided with a cover eccentric hole coaxial with the eccentric inner hole, and a plurality of second bolt holes are equidistantly arranged in the circumferential direction at the position close to the edge of the eccentric cover.
4. The double roll crusher shaft end seal apparatus as claimed in claim 2, wherein: The inner peripheral wall of the cover eccentric hole is provided with a dustproof ring and a first felt ring at intervals, the dustproof ring is close to the outer end face of the eccentric cover, and the dustproof ring and the first felt ring are both in sealing contact with the outer side wall of the crusher shaft end.
5. The double roll crusher shaft end seal apparatus as claimed in claim 4, wherein: The cover is provided with a cover through hole through which the shaft sleeve passes, the cover through hole is arranged centrally, a plurality of third bolt holes are equidistantly arranged in the circumferential direction at the position close to the edge of the cover, and the cover is fixedly connected with the outer end face of the bearing cup outer ring through a plurality of third bolts passing through the third bolt holes.
6. The double roll crusher shaft end seal apparatus as claimed in claim 1, wherein: The inner peripheral wall of the cover through hole is provided with a rotating shaft double-lip sealing ring and a second felt ring at intervals, the second felt ring is close to the outer end face of the cover, and the second felt ring and the rotating shaft double-lip sealing ring are both in sealing contact with the outer side wall of the shaft sleeve.
7. The double roll crusher shaft end seal apparatus as claimed in claim 6, wherein: The inner end face of the eccentric cover is provided with an annular abutting portion, the annular abutting portion is in abutment with the bearing, and a plurality of first oil injection holes are arranged on the outer side wall of the annular abutting portion.
8. The double roll crusher shaft end seal apparatus as claimed in claim 4, wherein: The bearing is a self-aligning roller bearing.
9. The double roll crusher shaft end seal apparatus as claimed in claim 2, wherein: