Combined type main shaft sealing mechanism and horizontal mixing machine

Abstract

The utility model discloses a combined type main shaft sealing mechanism and a horizontal mixing machine, the combined type main shaft sealing mechanism comprises a main shaft, a sealing cover and a sealing assembly, the sealing cover is provided with a first through hole and a second through hole, the main shaft can rotate relative to the sealing cover, and a closed cavity is formed in the sealing cover; the sealing assembly is arranged in the closed cavity, and the end face sealing component is used for preventing materials from entering the closed cavity from the first through hole; and the radial sealing part is used for blocking communication between the closed cavity and the second through hole. According to the technical scheme, by arranging the end face sealing component and the radial sealing component, double sealing between the main shaft and the end plate of the horizontal mixer is achieved, the main shaft and the end plate are matched with each other, materials can be prevented from entering the closed cavity from the first through hole, and foreign matter can also be prevented from entering the closed cavity from the second through hole; and even under the condition that any one of the end face sealing component and the radial sealing component fails, the sealing effect can be kept, so that the service life of the sealing assembly is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of mechanical seals, in particular to a composite main shaft sealing mechanism and a horizontal mixer. Background Art

[0002] In various machine tools and mechanical equipment, a sealing device is required between the spindle and the axle box. The existing spindle sealing structure adopts the same structure inside and outside. The sealing dynamic ring made of PTFE (Polytetrfluoroethlene) or other non-metallic materials is pressed to both ends by springs or rubber, and the inner cavity is inflated. The inflation pressure is generally about 0.03MPa ~ 0.05MPa; the sealing dynamic rings on both sides rotate synchronously with the spindle through friction or with the spindle locking mechanism, and form inner and outer sealing surfaces between the inner friction plate and the sealing cylinder respectively; at the same time, the inflation inside the cavity can better compress the sealing dynamic ring on the one hand, and compensate for the extremely small gap of the sealing surface during operation, and the material does not leak when used; although this solution can better compensate for the influence of the spindle runout on the sealing surface during operation, this type of seal also has the following shortcomings:

[0003] First, the sealing dynamic ring is smooth or grooved along the circumference, and dry friction is actually formed between the sealing surfaces during operation. Therefore, the life of the seal directly depends on the wear resistance of the dynamic ring material and the life is often short; second, the inflation pressure in the inner cavity will form pressure on the sealing dynamic ring. The increase in inflation pressure will increase the clamping force of the friction surface accordingly, causing the friction surface to heat up and the service life to decrease; third, the inner and outer sides use the same structure. Once the inner side in contact with the material fails, the two sealing surfaces will fail almost at the same time, affecting the service life. Utility Model Content

[0004] The main purpose of the utility model is to provide a composite main shaft sealing mechanism and a horizontal mixer, aiming to solve the problem that the main shaft sealing structure is prone to failure and has a short service life.

[0005] In order to achieve the above-mentioned purpose, the utility model proposes a composite spindle sealing mechanism, which comprises:

[0006] Spindle;

[0007] A sealing cover, wherein the sealing cover is provided with a first through hole and a second through hole for the main shaft to pass through in sequence, the main shaft can rotate relative to the sealing cover, and a closed cavity is formed in the sealing cover;

[0008] A sealing component, the sealing component is arranged in the closed cavity, the sealing component includes an end face sealing component and a radial sealing component, the end face sealing component is arranged around the main shaft and connected to the main shaft, so that the main shaft can drive the end face sealing component to move relative to the sealing cover, and the end face sealing component is used to prevent materials from entering the closed cavity from the first through hole;

[0009] The radial sealing component is annularly arranged on the main shaft, the inner ring of the radial sealing component is sealingly connected to the outer wall of the main shaft, and the radial sealing component is connected to the sealing cover so that the main shaft can rotate relative to the radial sealing component. The radial sealing component is used to block the communication between the closed cavity and the second through hole.

[0010] In one embodiment, the sealing cover is provided with a first air hole connected to the closed cavity; the end face sealing component is provided with a sealing area and a groove area on the side facing the first through hole, the groove area is provided with a groove, the sealing area can be sealed and connected to the inner wall of the closed cavity, and the sealing area is used to block the connection between the closed cavity and the first through hole; the end face sealing component is also provided with a connecting hole connecting the groove and the closed cavity, and the connecting hole is used to allow the airflow flowing into the closed cavity from the first air hole to flow to the groove through the connecting hole, so that the airflow can drive the sealing area to separate from the inner wall of the closed cavity to form an airflow channel blocking the closed cavity and the first through hole.

[0011] In one embodiment, there are multiple grooves, and the multiple grooves are distributed at intervals along the circumference of the end face sealing component.

[0012] In one embodiment, the end face sealing component includes a locking ring and a sealing ring that are connected to each other, and the locking ring and the sealing ring are both arranged on the main shaft; the sealing ring is arranged close to the first through hole, and the sealing area and the groove area are arranged on the side of the sealing ring facing the first through hole; the locking ring is connected to the main shaft so that the main shaft can drive the sealing ring to move relative to the sealing cover through the locking ring.

[0013] In one embodiment, the end face sealing component also includes an elastic ring, and the locking ring includes a ring body and a connecting piece, the ring body is arranged around the main shaft and connected to the main shaft, the ring body and the sealing ring are arranged at intervals along the axial direction of the main shaft, one end of the connecting piece is connected to the ring body, and the other end of the connecting piece is connected to the sealing ring; the elastic ring is arranged around the main shaft, the elastic ring is arranged between the ring body and the sealing ring, one side of the elastic ring abuts against the ring body, and the other side of the elastic ring abuts against the sealing ring.

[0014] In one embodiment, an annular positioning groove is formed on a side of the sealing ring away from the first through hole, the annular positioning groove extends along the circumference of the main shaft, and the annular positioning groove is used to accommodate at least a portion of the body of the elastic ring.

[0015] In one embodiment, the radial sealing component includes a sealing member and a clamping member, wherein the sealing member is annularly arranged on the main shaft, and the inner ring of the sealing member is sealingly connected to the outer wall of the main shaft, and the sealing member is sealingly connected to the inner wall of the closed cavity, so that the main shaft can rotate relative to the sealing member, and the sealing member can block the communication between the closed cavity and the second through hole; the clamping member is annularly arranged on the periphery of the sealing member, one side of the clamping member is abutted against the sealing member, and the other side of the clamping member is abutted against the inner wall of the closed cavity, so that the clamping member can press the seal against the main shaft, and the clamping member is used to maintain the sealed connection between the seal and the main shaft.

[0016] In one embodiment, the abutting member includes an airbag, one side of the airbag abuts against the sealing member, and the other side of the airbag abuts against the inner wall of the closed cavity, and the sealing cover is provided with a second air hole connected to the closed cavity.

[0017] In one embodiment, the composite spindle sealing mechanism also includes a partition member, which is arranged in the closed cavity, the partition member is annularly arranged on the main shaft, the inner ring of the partition member is connected to the outer wall of the main shaft, and the outer ring of the partition member is sealedly connected to the inner wall of the closed cavity, so that the partition member divides the closed cavity into a first cavity and a second cavity that are independent of each other, the end face sealing component is located in the first cavity, and the radial sealing component is arranged in the second cavity.

[0018] In addition, the utility model also proposes a horizontal mixer, which comprises an end plate and a composite main shaft sealing mechanism as described in any of the above technical solutions, wherein the end plate is connected to the sealing cover.

[0019] In an embodiment of the utility model, the main shaft first passes through the first through hole, then passes through the end face sealing component and the radial sealing component arranged in the closed cavity in sequence, and then passes through the second through hole. By setting a composite main shaft sealing mechanism, the sealing installation between the main shaft and the end plate of the horizontal mixer is realized, which can prevent material leakage; specifically, the main shaft can drive the end face sealing component to move relative to the sealing cover, and a sealing connection is formed between the end face sealing component and the sealing cover, thereby blocking the closed cavity and the first through hole from being connected, so as to prevent the material from entering the sealed cavity from the first through hole; the radial sealing component is sealedly connected to the sealing cover, and the main shaft can rotate relative to the radial sealing component and the sealing cover, thereby blocking the closed cavity and the second through hole from being connected, which can prevent foreign matter from entering the closed cavity from the second through hole; at the same time, in the event of failure of either the end face sealing component or the radial sealing component, the sealing effect can be maintained, for example, it can prevent the material from entering the closed cavity from the first through hole and then flowing out from the second through hole after the end face sealing component fails, or prevent the foreign matter from entering the closed cavity from the second through hole and then flowing out from the first through hole after the radial sealing component fails. The embodiment of the utility model realizes double sealing between the main shaft and the end plate of the horizontal mixer by arranging an end face sealing component and a radial sealing component, and adopting two different sealing methods, namely, end face sealing and radial sealing. The two cooperate with each other to prevent the material from entering the closed cavity from the first through hole, and to prevent foreign matter from entering the closed cavity from the second through hole. Even if either the end face sealing component or the radial sealing component fails, the sealing effect can be maintained to prevent the material from flowing out of the second through hole or the first through hole, thereby improving the service life of the sealing component. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0021] Figure 1 It is a structural schematic diagram of an embodiment of the composite main shaft sealing mechanism of the utility model;

[0022] Figure 2 It is a structural schematic diagram of the sealing cover of the composite main shaft sealing mechanism of the utility model;

[0023] Figure 3 The utility model is a schematic diagram of the structure of the sealing ring of the composite main shaft sealing mechanism.

[0024] Description of Figure Numbers:

[0025]

[0026]

[0027] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0029] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present utility model are only used to explain the position of the user in a certain posture (such as the attached Figure 1 The relative position relationship, movement status, etc. between the various components under the specific posture are shown. If the specific posture changes, the directional indication will also change accordingly.

[0030] In addition, the descriptions of "first", "second", etc. in the present utility model are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0031] The main purpose of the utility model is to provide a composite main shaft sealing mechanism and a horizontal mixer, aiming to solve the problem that the main shaft sealing structure is prone to failure and has a short service life.

[0032] The utility model provides a composite main shaft sealing mechanism.

[0033] like Figure 1As shown, in one embodiment of the utility model, the composite spindle sealing mechanism 100 includes a spindle 1, a sealing cover 2 and a sealing assembly 3. The sealing cover 2 is provided with a first through hole 211 and a second through hole 221 for the spindle 1 to pass through in sequence. The spindle 1 can rotate relative to the sealing cover 2. A closed cavity 231 is formed in the sealing cover 2. The sealing assembly 3 is arranged in the closed cavity 231. The sealing assembly 3 includes an end face sealing component 31 and a radial sealing component 32. The end face sealing component 31 is arranged around the spindle 1 and is connected to the spindle 1. The radial sealing component 32 is connected so that the main shaft 1 can drive the end face sealing component 31 to move relative to the sealing cover 2, and the end face sealing component 31 is used to prevent the material from entering the closed cavity 231 from the first through hole 211; the radial sealing component 32 is arranged in an annular manner on the main shaft 1, and the inner ring of the radial sealing component 32 is sealed and connected to the outer wall of the main shaft 1. The radial sealing component 32 is connected to the sealing cover 2 so that the main shaft 1 can rotate relative to the radial sealing component 32, and the radial sealing component 32 is used to block the closed cavity 231 from being connected to the second through hole 221.

[0034] In the embodiment of the utility model, the main shaft 1 first passes through the first through hole 211, then passes through the end face sealing component 31 and the radial sealing component 32 arranged in the closed cavity 231 in sequence, and then passes through the second through hole 221. By setting a composite main shaft sealing mechanism 100, the sealing installation between the main shaft 1 and the end plate of the horizontal mixer can be realized to prevent material leakage; specifically, the main shaft 1 can drive the end face sealing component 31 to move relative to the sealing cover 2, and a sealing connection is formed between the end face sealing component 31 and the sealing cover 2, thereby blocking the closed cavity 231 and the first through hole 211 from communicating with each other, so as to prevent the material from entering the sealing cavity from the first through hole 211; the radial The sealing component 32 is sealed and connected to the sealing cover 2, and the main shaft 1 can rotate relative to the radial sealing component 32 and the sealing cover 2, thereby blocking the communication between the closed cavity 231 and the second through hole 221, thereby preventing foreign matter from entering the closed cavity 231 from the second through hole 221; at the same time, in the event of failure of either the end face sealing component 31 or the radial sealing component 32, the sealing effect can still be maintained, for example, it can prevent the material from entering the closed cavity 231 from the first through hole 211 and then flowing out from the second through hole 221 after the end face sealing component 31 fails, or prevent foreign matter from entering the closed cavity 231 from the second through hole 221 and then flowing out from the first through hole 211 after the radial sealing component 32 fails.

[0035] The embodiment of the utility model realizes double sealing between the main shaft 1 and the end plate of the horizontal mixer by setting an end face sealing component 31 and a radial sealing component 32, and adopting two different sealing methods, namely, end face sealing and radial sealing. The two cooperate with each other to prevent the material from entering the closed cavity 231 from the first through hole 211, and to prevent foreign matter from entering the closed cavity 231 from the second through hole 221. Even if either the end face sealing component 31 or the radial sealing component 32 fails, the sealing effect can be maintained to prevent the material from flowing out of the second through hole 221 or the first through hole 211, thereby improving the service life of the sealing component 3.

[0036] like Figure 2 As shown, in this embodiment, the sealing cover 2 includes a sealing cylinder 23 and a mounting plate 21 and a cover plate 22 respectively arranged at both ends of the sealing cylinder 23. The mounting plate 21, the sealing cylinder 23 and the cover plate 22 are connected in sequence by screws 24. The mounting plate 21 has a first through hole 211, and the cover plate 22 has a second through hole 221. The main shaft 1 passes through the first through hole 211 and the second through hole 221 in sequence. The mounting plate 21, the sealing cylinder 23 and the cover plate 22 enclose a closed cavity 231.

[0037] According to an embodiment of the present invention, the sealing cover 2 may also be an integrally formed structure; this embodiment does not limit the forming method of the sealing cover 2.

[0038] In one embodiment, the sealing cover 2 is provided with a first air hole 232 connected to the sealed cavity 231; the end face sealing component 31 is provided with a sealing area 3111 and a groove area 3112 on the side facing the first through hole 211, and the groove area 3112 is provided with a groove 3112a, and the sealing area 3111 can be sealed and connected with the inner wall of the sealed cavity 231, and the sealing area 3111 is used to block the communication between the sealed cavity 231 and the first through hole 211; the end face sealing component 31 is also provided with a connecting hole 3112b connecting the groove 3112a and the sealed cavity 231, and the connecting hole 3112b is used to allow the first air hole 231 to pass through the sealing area 3111. The airflow flowing into the sealed cavity 231 through the hole 232 can flow to the groove 3112a through the connecting hole 3112b, so that the airflow can drive the sealing area 3111 to separate from the inner wall of the sealed cavity 231 to form a gas channel that blocks the communication between the sealed cavity 231 and the first through hole 211; in order to avoid dry friction between the end face sealing component 31 and the sealing cover 2 when the main shaft 1 rotates and to improve the service life of the end face sealing component 31, a groove 3112a and a sealing area 3111 are provided on the end face sealing component 31, and the airflow enters the sealed cavity 231 through the first air hole 232. When the end face sealing component 31 rotates, the end face sealing component 31 rotates. When the main shaft 1 rotates, the airflow is sucked into the groove 3112a from the connecting hole 3112b along the circumferential direction and flows toward the center of the end face sealing component 31. The groove 3112a has a side wall 3112d and a closing portion 3112c connected to the side wall 3112d. The closing portion 3112c of the groove 3112a and the sealing area 3111 prevent the airflow from flowing to the center of the end face sealing component 31, so the airflow is compressed, thereby causing the pressure to rise. The fluid film pressure generated thereby separates the sealing area 3111 from the sealing cover 2 and forms an air film with a balanced gap, which is a barrier between the closed cavity 231 and the first The gas passage connected by the through hole 211, the air film completely blocks the material leakage passage from the first through hole 211 to the closed cavity 231, thereby achieving zero leakage or zero escape of the material; in this embodiment, a dry gas seal is used to block the connection between the closed cavity 231 and the first through hole 211, so that the end face sealing component 31 is not directly in contact with the sealing cover 2 and wears, thereby improving the service life of the end face sealing component 31; and a higher pressure airflow can be filled in the closed cavity 231 to compensate for the extremely small gap between the sealing area 3111 and the sealing cover 2 during operation, thereby increasing the leakage threshold and improving the sealing effect.

[0039] According to an embodiment of the utility model, the main shaft 1 drives the end face sealing component 31 to rotate relative to the sealing cover 2, and dry friction is formed between the end face sealing component 31 and the sealing cover 2, thereby achieving a sealed connection.

[0040] In one embodiment, the composite spindle sealing mechanism 100 further includes an air filling component 5 , which is sealedly connected to the first air hole 232 and is used to fill air into or discharge air from the sealed cavity 231 .

[0041] Based on the above embodiment, there are multiple grooves 3112a, and the multiple grooves 3112a are distributed at intervals along the circumference of the end face sealing component 31; this embodiment does not limit the number of grooves 3112a, and in order to ensure the stability of the air film formed between the sealing area 3111 and the sealing cover 2, in this embodiment, the multiple grooves 3112a can be evenly distributed along the circumference of the end face sealing component 31, so that the air film can be formed more stably and the dry gas sealing effect is better.

[0042] In one embodiment, the shape of the groove 3112a is a T-shaped groove; in another embodiment, the shape of the groove 3112a may also be a V-shaped groove or a U-shaped groove; this embodiment does not limit the specific shape of the groove 3112a.

[0043] like Figure 1 and Figure 3 As shown, in the present embodiment, the end face sealing component 31 comprises a locking ring 312 and a sealing ring 311 which are connected to each other, and the locking ring 312 and the sealing ring 311 are both arranged in a ring around the main shaft 1; the sealing ring 311 is arranged close to the first through hole 211, and the sealing ring 311 is provided with a sealing area 3111 and a groove area 3112 on the side facing the first through hole 211; the locking ring 312 is connected to the main shaft 1 so that the main shaft 1 can drive the sealing ring 311 to move relative to the sealing cover 2 through the locking ring 312; specifically, the locking ring 312 is used to connect and fix the main shaft 1 and the sealing ring 311, and can provide a stable fastening force to ensure the firmness and stability of the connection between the main shaft 1 and the sealing ring 311; the sealing ring 311 is used to prevent material leakage in the horizontal mixer, and a dry gas seal is formed between the sealing ring 311 and the sealing cover 2 to avoid material leakage, thereby ensuring the normal operation of the horizontal mixer; when the main shaft 1 rotates, the sealing ring 312 drives the sealing ring 311 to move relative to the sealing cover 2 The ring 311 rotates relative to the sealing cover 2. Since the sealing ring 311 is provided with a sealing area 3111 and a groove 3112a, the airflow is sucked into the groove 3112a along the circumferential direction from the connecting hole 3112b and flows toward the center of the sealing ring 311. However, the closing portion 3112c of the groove 3112a and the sealing area 3111 prevent the airflow from flowing to the center of the sealing ring 311, so the airflow is compressed, thereby causing the pressure to rise. The fluid film pressure generated thereby separates the sealing area 3111 of the sealing ring 311 from the sealing cover 2 and forms an air film with a balanced gap. The air film completely blocks the material leakage channel from the first through hole 211 to the closed cavity 231, thereby achieving zero leakage or zero escape of the material. In this embodiment, a dry gas seal is used to block the connection between the closed cavity 231 and the first through hole 211, so that the end face sealing component 31 does not directly contact and wear with the sealing cover 2, thereby improving the service life of the end face sealing component 31.

[0044] Based on the above embodiment, the end face sealing component 31 also includes an elastic ring 313, and the locking ring 312 includes a ring body 3121 and a connecting piece 3122. The ring body 3121 is arranged around the main shaft 1 and connected to the main shaft 1. The ring body 3121 and the sealing ring 311 are arranged at intervals along the axial direction of the main shaft 1. One end of the connecting piece 3122 is connected to the ring body 3121, and the other end of the connecting piece 3122 is connected to the sealing ring 311; the elastic ring 313 is arranged around the main shaft 1, and the elastic ring 313 is arranged between the ring body 3121 and the sealing ring 311. One side of the elastic ring 313 abuts against the ring body 3121, and the other side of the elastic ring 313 abuts against the sealing ring 311; the elastic ring 313 is arranged between the ring body 3121 and the sealing ring 311, and mainly plays the role of pre-tightening, compensation and buffering, and can ensure good fit between the sealing ring 311 and the sealing cover 2 when the main shaft 1 is not rotating. When the main shaft 1 rotates, the elastic ring 313 can provide a uniform and stable elastic force, which can ensure that the sealing ring 311 is evenly stressed to form a stable air film; in order to separate the sealing area 3111 and the sealing cover 2, when the main shaft 1 drives the sealing ring 311 to rotate through the ring body 3121 and the connecting piece 3122, the air flow pressure in the groove 3112a increases, and the fluid film pressure generated thereby pushes the sealing ring 311 to move left and compresses the elastic ring 313, so that the sealing area 3111 and the sealing cover 2 are separated, until the fluid film pressure is balanced with the compression force on the elastic ring 313, forming a stable air film that has a sealing effect, and the air film can not only avoid mutual contact and wear between the dynamic sealing area 3111 and the sealing cover 2, but also achieve the purpose of sealing; after the work is completed, the main shaft 1 stops rotating, the air flow can be discharged, the elastic ring 313 is reset, and the sealing ring 311 is pushed to move right to its original position.

[0045] According to one embodiment of the utility model, the end face sealing component 31 can be an elastic member. The air flow pressure in the groove 3112a increases, and the fluid film pressure generated thereby causes the end face sealing component 31 to undergo elastic deformation, thereby separating the sealing area 3111 and the sealing cover 2. This embodiment does not limit the specific form of the end face sealing component 31.

[0046] Furthermore, an annular positioning groove 3113 is provided on the side of the sealing ring 311 away from the first through hole 211, and the annular positioning groove 3113 extends along the circumference of the main shaft 1, and the annular positioning groove 3113 is used to accommodate at least part of the body of the elastic ring 313; in order to limit the elastic ring 313 so that it can provide uniform and stable elastic force for the sealing ring 311, the sealing ring 311 is provided with an annular positioning groove 3113, one side of the elastic ring 313 abuts against the ring body 3121, and at least part of the body of the other side of the elastic ring 313 is located in the annular positioning groove 3113 and abuts against the annular positioning groove 3113. When the main shaft 1 rotates, the locking ring 312 drives the elastic ring 313 and the sealing ring 311 to rotate together, which can prevent the elastic ring 313 from moving up and down relative to the sealing ring 311, and can also make the air film formed more uniform and stable, thereby achieving a good sealing effect.

[0047] In one embodiment, the radial sealing component 32 includes a sealing member 321 and a pressing member 322. The sealing member 321 is arranged around the main shaft 1, and the inner ring of the sealing member 321 is sealed and connected to the outer wall of the main shaft 1. The sealing member 321 is sealed and connected to the inner wall of the closed cavity 231, so that the main shaft 1 can rotate relative to the sealing member 321, and the sealing member 321 can block the closed cavity 231 from communicating with the second through hole 221; the pressing member 322 is arranged around the outer periphery of the sealing member 321, one side of the pressing member 322 abuts against the sealing member 321, and the other side of the pressing member 322 abuts against the inner wall of the closed cavity 231, so that the pressing member 322 can press the sealing member 321 against the main shaft 1, and the pressing member 322 can press the sealing member 321 against the main shaft 1. The tightening member 322 is used to maintain the sealed connection between the seal 321 and the main shaft 1; specifically, the seal 321 is arranged in an annular manner on the main shaft 1, and the tightening member 322 is arranged in an annular manner on the periphery of the seal 321. The seal 321 is pressed against the main shaft 1 by the tightening member 322 and the sealed connection between the seal 321 and the main shaft 1 is maintained, so that the main shaft 1 can rotate relative to the seal 321, and the seal 321 can block the communication between the closed cavity 231 and the second through hole 221, thereby preventing foreign matter from entering the closed cavity 231 from the second through hole 221, and also preventing the material from flowing out of the second through hole 221 after the end face seal fails, thereby improving the service life of the radial sealing component 32.

[0048] In one embodiment, the seal 321 is sealedly connected to the inner wall of the sealing cover 2 to achieve a sealed connection between the seal 321 and the inner wall of the closed cavity 231, so that the main shaft 1 can rotate relative to the seal 321, and the seal 321 can block the communication between the closed cavity 231 and the second through hole 221; in another embodiment, the seal 321 is sealedly connected to the inner wall of the second through hole 221 to achieve a sealed connection between the seal 321 and the inner wall of the closed cavity 231, so that the main shaft 1 can rotate relative to the seal 321, and the seal 321 can block the communication between the closed cavity 231 and the second through hole 221; this embodiment does not limit the sealing connection method between the seal 321 and the closed cavity 231.

[0049] In this embodiment, the seal 321 needs to have excellent wear resistance, pressure resistance, high temperature stability and be easy to install and maintain. Therefore, in this embodiment, the seal 321 can adopt a packing ring, which is pressed against the main shaft 1 by the clamping member 322, and the sealing connection between the packing ring and the main shaft 1 is maintained; in another embodiment, the seal 321 can also adopt other structures to achieve radial sealing, such as an elastic ring; this embodiment does not limit the specific selection of the seal 321.

[0050] Furthermore, in the present embodiment, the abutting member 322 comprises an airbag, one side of which abuts against the sealing member 321, and the other side of which abuts against the inner wall of the sealed cavity 231; the sealing cover 2 is provided with a second air hole 233 connected to the sealed cavity 231; an air nozzle 3221 is provided on the airbag, and the air nozzle 3221 passes through the second air hole 233, and the airbag is inflated or exhausted through the air nozzle 3221; the airbag is arranged around the periphery of the sealing member 321, one side of the airbag abuts against the sealing member 321, and the other side of the airbag abuts against the inner wall of the sealed cavity 231; as the airbag is continuously inflated, the airbag can push the sealing member 321 to move toward the main shaft 1 so that the sealing member 321 can be pressed against the main shaft 1, and the airbag and the sealing member 321 can fill the second cavity Body 2312 can prevent materials from entering the second cavity 2312, thereby reducing material leakage or foreign matter contamination; by maintaining the inflation pressure of the airbag, the sealed connection between the seal 321 and the main shaft 1 can be maintained. Compared with the clamping member 322 of other structures, the clamping member 322 in this embodiment adopts an airbag, and the inflation pressure of the airbag can be adjusted to achieve the adjustment of the clamping force on the radial sealing surface, which can ensure that the clamping force at various parts of the seal 321 remains consistent, thereby achieving a better radial sealing effect; and after the sealing operation, the expansion of the airbag can be used to compensate for the wear of the seal 321 during the operation process, so that the seal 321 does not need to be regularly compressed or replaced during use, thereby reducing maintenance costs.

[0051] According to one embodiment of the utility model, the clamping member 322 can be an elastic member. During installation, the clamping member 322 is first in a compressed state. When it is restored to its original state, the seal 321 can be pressed against the main shaft 1 to maintain the sealed connection between the seal 321 and the main shaft 1; according to another embodiment of the utility model, the clamping member 322 can also be a cylinder, and the output end of the cylinder is in contact with the seal 321. The seal 321 is pressed against the main shaft 1 through the cylinder to maintain the sealed connection between the seal 321 and the main shaft 1; this embodiment does not limit the specific structure of the clamping member 322.

[0052] Based on the above embodiment, the composite spindle sealing mechanism 100 also includes a partition member 4, which is arranged in the closed cavity 231, and the partition member 4 is arranged around the spindle 1. The inner ring of the partition member 4 is connected to the outer wall of the spindle 1, and the outer ring of the partition member 4 is sealed and connected to the inner wall of the closed cavity 231, so that the partition member 4 separates the closed cavity 231 into a first cavity 2311 and a second cavity 2312 that are independent of each other, the end face sealing component 31 is located in the first cavity 2311, and the radial sealing component 32 is arranged Specifically, a step 234 is provided on the inner wall of the sealed cavity 231, and the outer ring of the partition member 4 is sealed and connected to the inner wall of the sealed cavity 231 and abuts against the step 234. The step 234 limits the axial sliding of the partition member 4. The partition member 4 is located in the second cavity 2312, and the airbag can be limited in the horizontal direction, so that the airbag squeezes the sealing member 321 in the vertical direction to abut against the main shaft 1 to form a radial seal; and in the second cavity 2312, due to the sealing member 321, the sealing member 321 is One side of the seal 321 is sealed and connected to the inner wall of the closed cavity 231, and the other side of the seal 321 is sealed and connected to the partition 4. Therefore, even if the end face sealing component 31 is worn and fails, and the material enters the first cavity 2311 from the first through hole 211, the radial sealing component 32 can still play a sealing role, and can prevent the material entering the first cavity 2311 from entering the second cavity 2312 through the gap between the inner ring of the partition 4 and the outer wall of the main shaft 1, thereby improving the service life of the radial sealing component 32; by setting the partition 4, the closed cavity 231 is divided into a first cavity 2311 and a second cavity 2312 which are independent of each other, so that the end face sealing component 31 arranged in the first cavity 2311 and the radial sealing component 32 arranged in the second cavity 2312 are also independent of each other, the end face sealing component 31 becomes a material blocking structure and a foreign body blocking structure of the radial sealing component 32, and the radial sealing component 32 becomes an outer end sealing structure of the end face seal, and the two complement each other and compensate for each other's defects to achieve a better sealing effect.

[0053] The utility model also proposes a horizontal mixer, which includes an end plate and a composite spindle sealing mechanism 100. The specific structure of the composite spindle sealing mechanism 100 refers to the above embodiment. Since the horizontal mixer adopts all the technical solutions of all the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here. Among them, the end plate is connected to the sealing cover 2. In this embodiment, a mounting hole 212 is provided on the mounting plate 21, and a detachable connection between the mounting plate 21 and the end plate can be achieved by fasteners.

[0054] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A composite spindle sealing mechanism, characterized in that: The composite spindle sealing mechanism comprises: Spindle; A sealing cover, wherein the sealing cover is provided with a first through hole and a second through hole for the main shaft to pass through in sequence, the main shaft can rotate relative to the sealing cover, and a closed cavity is formed in the sealing cover; A sealing component, the sealing component is arranged in the closed cavity, the sealing component includes an end face sealing component and a radial sealing component, the end face sealing component is arranged around the main shaft and connected to the main shaft, so that the main shaft can drive the end face sealing component to move relative to the sealing cover, and the end face sealing component is used to prevent materials from entering the closed cavity from the first through hole; The radial sealing component is annularly arranged on the main shaft, the inner ring of the radial sealing component is sealingly connected to the outer wall of the main shaft, and the radial sealing component is connected to the sealing cover so that the main shaft can rotate relative to the radial sealing component. The radial sealing component is used to block the communication between the closed cavity and the second through hole.

2. The composite spindle sealing mechanism according to claim 1, characterized in that: The sealing cover is provided with a first air hole connected to the closed cavity; the end face sealing component is provided with a sealing area and a groove area on the side facing the first through hole, the groove area is provided with a groove, the sealing area can be sealed and connected with the inner wall of the closed cavity, and the sealing area is used to block the connection between the closed cavity and the first through hole; the end face sealing component is also provided with a connecting hole connecting the groove and the closed cavity, and the connecting hole is used to allow the airflow flowing into the closed cavity from the first air hole to flow to the groove through the connecting hole, so that the airflow can drive the sealing area to separate from the inner wall of the closed cavity to form an airflow channel blocking the closed cavity and the first through hole.

3. The composite spindle sealing mechanism according to claim 2, characterized in that: There are multiple grooves, and the multiple grooves are distributed at intervals along the circumference of the end face sealing component.

4. The composite spindle sealing mechanism according to claim 2, characterized in that: The end face sealing component includes a locking ring and a sealing ring that are connected to each other, and the locking ring and the sealing ring are both arranged on the main shaft; the sealing ring is arranged close to the first through hole, and the sealing area and the groove area are arranged on the side of the sealing ring facing the first through hole; the locking ring is connected to the main shaft so that the main shaft can drive the sealing ring to move relative to the sealing cover through the locking ring.

5. The composite spindle sealing mechanism according to claim 4, characterized in that: The end face sealing component also includes an elastic ring, and the locking ring includes a ring body and a connecting piece, the ring body is arranged around the main shaft and connected to the main shaft, the ring body and the sealing ring are arranged at intervals along the axial direction of the main shaft, one end of the connecting piece is connected to the ring body, and the other end of the connecting piece is connected to the sealing ring; the elastic ring is arranged around the main shaft, the elastic ring is arranged between the ring body and the sealing ring, one side of the elastic ring abuts against the ring body, and the other side of the elastic ring abuts against the sealing ring.

6. The composite spindle sealing mechanism according to claim 5, characterized in that: An annular positioning groove is formed on one side of the sealing ring away from the first through hole. The annular positioning groove extends along the circumference of the main shaft and is used to accommodate at least a portion of the body of the elastic ring.

7. The composite spindle sealing mechanism according to claim 1, characterized in that: The radial sealing component includes a sealing member and a clamping member, wherein the sealing member is annularly arranged on the main shaft, and the inner ring of the sealing member is sealed and connected to the outer wall of the main shaft, and the sealing member is sealed and connected to the inner wall of the closed cavity, so that the main shaft can rotate relative to the sealing member, and the sealing member can block the communication between the closed cavity and the second through hole; the clamping member is annularly arranged on the periphery of the sealing member, one side of the clamping member is in contact with the sealing member, and the other side of the clamping member is in contact with the inner wall of the closed cavity, so that the clamping member can press the seal against the main shaft, and the clamping member is used to maintain the sealed connection between the seal and the main shaft.

8. The composite spindle sealing mechanism according to claim 7, characterized in that: The abutting member comprises an airbag, one side of the airbag abuts against the sealing member, and the other side of the airbag abuts against the inner wall of the closed cavity, and the sealing cover is provided with a second air hole communicating with the closed cavity.

9. The composite spindle sealing mechanism according to any one of claims 1 to 8, characterized in that: The composite spindle sealing mechanism also includes a partition member, which is arranged in the closed cavity. The partition member is annularly arranged on the spindle, the inner ring of the partition member is connected to the outer wall of the spindle, and the outer ring of the partition member is sealed and connected to the inner wall of the closed cavity, so that the partition member divides the closed cavity into a first cavity and a second cavity that are independent of each other, the end face sealing component is located in the first cavity, and the radial sealing component is arranged in the second cavity.

10. A horizontal mixer, characterized in that: The horizontal mixer comprises an end plate and a composite main shaft sealing mechanism according to any one of claims 1 to 9, wherein the end plate is connected to the sealing cover.

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