A high-hermetic dry machine extrusion sealing structure

Abstract

The present invention discloses an extrusion sealing structure for a highly enclosed dry process machine, comprising an extrusion component and a front cover door, wherein the extrusion component comprises an upper extrusion box body and a lower extrusion box body, and is characterized in that an upper air-sealing quick joint is provided on the upper extrusion box body, an upper extrusion sealing structure is provided in the upper extrusion box body, and a pressurized air flow is introduced into the upper extrusion sealing structure through the upper air-sealing quick joint, and back-blowing prevents material from penetrating; a lower air-sealing quick joint is provided on the lower extrusion box body, a lower extrusion sealing structure is provided in the lower extrusion box body, and a pressurized air flow is introduced into the lower extrusion sealing structure through the lower air-sealing quick joint, and back-blowing prevents material from penetrating. The beneficial effects of the present invention are as follows: through the air-sealing channel, airflow channel, and ventilation ring provided, an airflow of a certain pressure can be introduced into the upward extrusion box body or the lower extrusion box body, and back-blowing prevents material from penetrating, thereby playing an air-sealing role.

Description

Technical Field

[0001] The invention relates to the technical field of dry granulator sealing, in particular to a highly enclosed dry granulator extrusion sealing structure. Background Art

[0002] The extrusion sealing structure of the high-sealed dry granulator mainly consists of an extrusion box, upper and lower end covers of the extrusion box, upper and lower sealing end covers connected to the extrusion box end covers, and upper and lower connecting plates. It is one of the most important components of the high-sealed dry granulator. Its main function is to pass the material delivered by the front mechanism into the space between the two extrusion wheels, press the material into thin slices through the relative rotation of the extrusion wheels, cut the thin slices into small pieces by the crushing system, and then pass the secondary finishing system to make the small pieces into powder with the required particle size, thus completing the granulation process.

[0003] During operation, the material is transported forward through the conveying mechanism. When the material passes between the two extrusion wheels, the two extrusion wheels exert an extrusion effect on the material, causing the upper box body of the extrusion box and the connected end cover related parts to move up and down at the same time. Due to the up and down movement, the sealing ring between the fitting surface of the upper end cover and the frame panel (front cover door bottom plate) will increase the amount of wear, which is one of the sealing risks; at the same time, the relative rotation between the extrusion box end cover skeleton oil seal and the rotating shaft will affect the matching accuracy of the inner ring. After progressive wear, the gap is too large, which will cause material leakage along the axial direction, which is the second sealing risk.

[0004] The extrusion sealing structure is a part of the dry granulator. For dry granulators producing anti-tumor drugs, if the sealing of the extrusion parts is not high during operation or cleaning, the powder or the liquid medicine produced during cleaning will leak out. Since anti-tumor drugs are highly toxic and can cause harm to the human body and the environment, this type of dry granulator has very high sealing requirements and no leakage can occur. It is a highly sealed dry granulator. Summary of the Invention

[0005] In view of the problems existing in the prior art, the present invention provides a highly enclosed dry-process machine extrusion sealing structure with a reasonable structural design.

[0006] The technical solutions of the present invention are as follows:

[0007] A highly enclosed dry machine extrusion sealing structure comprises an extrusion component and a front cover door, wherein the extrusion component comprises an upper extrusion box body and a lower extrusion box body, and is characterized in that an upper airtight quick joint is provided on the upper extrusion box body, an upper extrusion sealing structure is provided in the upper extrusion box body, and a pressurized airflow is introduced into the upper extrusion sealing structure through the upper airtight quick joint, and backblowing prevents material from penetrating; a lower airtight quick joint is provided on the lower extrusion box body, a lower extrusion sealing structure is provided in the lower extrusion box body, and a pressurized airflow is introduced into the lower extrusion sealing structure through the lower airtight quick joint, and backblowing prevents material from penetrating.

[0008] The described high-enclosed dry machine extrusion sealing structure is characterized in that the upper extrusion sealing structure includes a main shaft, an extrusion box end cover, a front cover door bottom plate, a sealing end cover and a sealing connecting plate, the sealing end cover is threadedly connected to the extrusion box end cover, the extrusion box end cover is fixed on the upper extrusion box, and the sealing end cover and the sealing connecting plate are fixedly connected by screws; the main shaft is sequentially sleeved with a first sealing gasket, a first skeleton oil seal, a ventilation baffle ring, a second skeleton oil seal, a second sealing gasket and a V-shaped rotating sealing ring; the extrusion box end cover is provided with an air flow channel at a position corresponding to the ventilation baffle ring, the extrusion box is provided with an air sealing channel, and the air sealing channel is connected to the air flow channel.

[0009] The described high-enclosed dry machine extrusion sealing structure is characterized in that the lower extrusion sealing structure includes a main shaft, an extrusion box end cover, a front cover door bottom plate, a sealing end cover and a sealing connecting plate, the sealing end cover is threadedly connected to the extrusion box end cover, the extrusion box end cover is fixed on the lower extrusion box, and the sealing end cover and the sealing connecting plate are fixedly connected by screws; the main shaft is sequentially sleeved with a first sealing gasket, a first skeleton oil seal, a ventilation baffle ring, a second skeleton oil seal, a second sealing gasket and a V-shaped rotating sealing ring; the extrusion box end cover is provided with an air flow channel at a position corresponding to the ventilation baffle ring, the extrusion box is provided with an air sealing channel, and the air sealing channel is connected to the air flow channel.

[0010] The highly enclosed dry machine extrusion sealing structure is characterized in that a sealing groove is provided on the sealing end cover on the mating surface with the sealing connecting plate, and a first O-ring is provided in the sealing groove.

[0011] The high-enclosed dry machine extrusion sealing structure is characterized in that a sealing groove is provided on the sealing end cover on the surface that fits with the front cover door bottom plate, a second O-ring is provided in the sealing groove, and the second O-ring is fitted between the two surfaces by a set compression amount.

[0012] The highly enclosed dry machine extrusion sealing structure is characterized in that sealing grooves are respectively provided on the end cover of the extrusion box on both sides of the inlet of the air flow channel, and a third O-ring is provided in the sealing groove to prevent gas leakage.

[0013] The highly enclosed dry machine extrusion sealing structure is characterized in that a sealing sleeve is provided on the main shaft outside the sealing connecting plate.

[0014] The high-sealed dry machine extrusion sealing structure is characterized in that the inner hole of the V-shaped rotating sealing ring is interference fit with the outer circle of the main shaft, and the bevel of the end face of the V-shaped rotating sealing ring is tightly attached to the end face of the sealing end cover.

[0015] The high-sealed dry machine extrusion sealing structure is characterized in that the two holes where the upper extrusion wheel and the lower extrusion wheel are located on the bottom plate of the front cover door are both waist-shaped holes, so that the second O-ring is away from the edge of the hole.

[0016] The highly enclosed dry machine extrusion sealing structure is characterized in that 18 ∮4 air holes are evenly distributed on the surface of the ventilation ring for ventilation.

[0017] The beneficial effects of the present invention are:

[0018] 1) Through the provided air sealing channel, air flow channel and vent ring, a certain pressure of air can be introduced into the upward or downward extrusion box, which will back-blow to prevent the material from penetrating and play an air sealing role.

[0019] 2) The airtight sealing channel in the extrusion sealing structure is connected to the air holes on the side of the upper and lower extrusion boxes and the end cover and the vent ring of the extrusion box, which makes the structure compact and reduces space.

[0020] 3) The V-shaped rotary sealing ring has the dual functions of axial sealing and end face sealing. The material is nitrile rubber, which has high wear resistance, good oil resistance and good air tightness. It is dustproof, oilproof and waterproof. It is easy to install and can be directly put on the shaft. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of the dry granulator of the present invention;

[0022] Figure 2 It is a schematic structural diagram of the extrusion component of the present invention;

[0023] Figure 3 AA cross-sectional structural diagram of the present invention;

[0024] Figure 4 BB is a schematic diagram of the cross-sectional structure of the present invention;

[0025] Figure 5 It is a schematic diagram of the CC cross-sectional structure of the present invention. DETAILED DESCRIPTION

[0026] The present invention will be further described below with reference to the accompanying drawings.

[0027] like Figure 1-5As shown, a highly enclosed dry machine extrusion sealing structure includes an extrusion component 1 and a front cover door 2; the extrusion component 1 includes an upper extrusion box body 102 and a lower extrusion box body 105, an upper airtight quick joint 107 is provided on the side of the upper extrusion box body 102, an upper extrusion sealing structure is provided in the upper extrusion box body 102, and a pressurized air flow is introduced into the upper extrusion sealing structure through the upper airtight quick joint 107, and backblowing prevents material from penetrating; a lower airtight quick joint 106 is provided on the side of the lower extrusion box body 105, a lower extrusion sealing structure is provided in the lower extrusion box body 104, and a pressurized air flow is introduced into the lower extrusion sealing structure through the lower airtight quick joint 106, and backblowing prevents material from penetrating.

[0028] The upper extrusion sealing structure includes a main shaft 109, an extrusion box end cover 124, a front cover door bottom plate 123, a sealing end cover 121 and a sealing connecting plate 112. The sealing end cover 121 is threadedly connected to the extrusion box end cover 124, the extrusion box end cover 124 is fixed on the upper extrusion box 102, and the sealing end cover 121 and the sealing connecting plate 112 are fixedly connected by screws 120; the main shaft 109 is sequentially sleeved with a first sealing gasket 113, a first skeleton oil seal 114, a ventilation ring 115, a second skeleton oil seal 116, a second sealing gasket 117 and a V-shaped rotating sealing ring 118; the extrusion box end cover 124 is provided with an air flow channel at a position corresponding to the ventilation ring 115, and the extrusion box 102 is provided with an air sealing channel 110, and the air sealing channel 110 is connected to the air flow channel.

[0029] The lower extrusion sealing structure includes a main shaft 109, an extrusion box end cover 124, a front cover door bottom plate 123, a sealing end cover 121 and a sealing connecting plate 112. The sealing end cover 121 is threadedly connected to the extrusion box end cover 124, the extrusion box end cover 124 is fixed on the lower extrusion box 105, and the sealing end cover 121 is fixedly connected to the sealing connecting plate 112 by screws 120; the main shaft 109 is sequentially sleeved with a first sealing gasket 113, a first skeleton oil seal 114, a ventilation ring 115, a second skeleton oil seal 116, a second sealing gasket 117 and a V-shaped rotating sealing ring 118; an air flow channel is provided on the extrusion box end cover 124 at a position corresponding to the ventilation ring 115, and an air sealing channel 110 is provided on the extrusion box 102, and the air sealing channel 110 is connected to the air flow channel.

[0030] In this embodiment, the sealing end caps 121 in the upper and lower extrusion sealing structures are provided with sealing grooves on the surfaces matching the sealing connecting plate 112 , and the first O-rings 119 are provided in the sealing grooves.

[0031] In this embodiment, a sealing groove is provided on the sealing end cover 121 in the upper and lower extrusion sealing structures on the surface where it contacts the front cover door bottom plate 123. A second O-ring 122 is provided in the sealing groove and is contacted between the two surfaces by a set compression amount of the second O-ring 122.

[0032] In this embodiment, the extrusion box end covers 124 in the upper and lower extrusion sealing structures are provided with sealing grooves on both sides of the inlet of the air flow channel, and third O-rings 125 are provided in the sealing grooves to prevent gas leakage.

[0033] In this embodiment, a sealing sleeve 108 is provided on the main shaft 109 in the upper and lower extrusion sealing structures at the outer side of the sealing connecting plate 112 .

[0034] In this embodiment, the inner hole of the V-shaped rotary seal ring 118 in the upper and lower extrusion seal structures is interference fit with the outer circle of the main shaft 109, and the beveled edge of the end face of the V-shaped rotary seal ring 118 is tightly attached to the end face of the sealing end cover 121.

[0035] In this embodiment, the two holes where the upper extrusion wheel 101 and the lower extrusion wheel 104 are located on the front cover door bottom plate 123 in the upper and lower extrusion sealing structures are both waist-shaped holes, so that the second O-ring 122 is away from the edge of the hole.

[0036] In this embodiment, 18 ∮4 air holes are evenly distributed on the surface of the ventilation ring 115 in the upper and lower extrusion sealing structures for ventilation.

[0037] Working principle:

[0038] Working principle of the high-sealed dryer: the material is transported by the feeding system to between the upper extrusion wheel 101 and the lower extrusion wheel 104. The extrusion wheel is driven by the reduction motor and drives the upper and lower extrusion wheels to rotate relative to each other through the gear transmission. The scrapers on both sides of the upper scraper assembly 103 scrape off the material adhering to the two sides of the upper extrusion wheel 101. The material is pressed into sheets by the two extrusion wheels and broken into small pieces by the crushing knife in the crushing system. It falls into the secondary granulation system and is made into the required particle size through secondary granulation. The extrusion force of the extrusion wheel and the power for the up and down movement of the upper box body are provided by the hydraulic lifting system on the dryer. When the upper extrusion box body 102 moves up and down, the corresponding components move up and down accordingly.

[0039] Working principle of the extrusion component: When working, the reduction motor 111 drives the main shaft 109 in the lower extrusion box 105 to rotate, and a pair of meshing gears on the main shaft 109 in the lower extrusion box 105 and the main shaft 109 in the upper extrusion box 102 drive the main shaft 109 in the upper extrusion box 102 to rotate relative to each other, thereby driving the related parts on the lower extrusion wheel 104 and the upper extrusion wheel 101 to rotate simultaneously.

[0040] Sealing principle of the extrusion sealing structure: the first sealing gasket 113 and the second skeleton oil seal 114 are used to seal the lubricating oil in the upper and lower extrusion boxes from penetrating along the surface of the main shaft 109 of the component, and at the same time, the sealing material and the medicine produced during cleaning penetrate into the upper and lower extrusion boxes; 18 air holes with a size of ∮4 are evenly distributed on the surface of the vent ring 115, which are used to allow the air flow flowing in from the air sealing channel component 110, and the air flow pressure is 0.5 bar. The role of the air flow here is: 1) When the second skeleton oil seal 116, the second sealing gasket 117, the V-shaped rotating sealing ring component 8 (at the end face), and the sealing sleeve 108 are worn 1) When the material in the front cover door of the pelletizing box penetrates into the space between the second skeleton oil seal 116 and other sealing components and the main shaft 109 along the surface of the main shaft, the wear between the sealing components and the shaft will be aggravated. Since a certain pressure of air flow is introduced, it will back-blow to prevent the material from penetrating, that is, the air sealing effect; 2) the air flow has the sealing function of detecting the second skeleton oil seal, the second sealing gasket, and the V-shaped rotating sealing ring. When the second skeleton oil seal, the second sealing gasket, and the V-shaped rotating sealing ring are worn, the air flow pressure will decrease. At this time, the components controlled by the program will alarm to indicate that the seals need to be replaced to maintain normal sealing.

[0041] The V-shaped rotary seal 118 performs dual functions of axial sealing and end face sealing. Made of nitrile rubber (NBR), it offers high wear resistance, excellent oil resistance, and excellent airtightness, making it dustproof, oil-proof, and waterproof. It is simple to install and can be directly mounted on the shaft. The inner bore of the V-shaped rotary seal 118 forms an interference fit with the outer diameter of the main shaft 109. During operation, the V-shaped rotary seal rotates with the main shaft 109 without relative motion, resulting in no wear on the inner bore. The beveled edge of the end face seal rests closely on the end face of the sealing end cap 121, which has a roughness of 1.6 and a smooth finish, ensuring minimal wear on the beveled edge of the V-shaped rotary seal 118. Due to its excellent elasticity and airtightness, the beveled edge of the V-shaped rotary seal 118 naturally rests on the end face of the sealing end cap 121, maintaining a sealed state and preventing the infiltration of materials from the outside of the sealing sleeve 108, between the sealing connecting plate 112 and the sealing end cap 121, and of cleaning chemicals.

[0042] Sealing sleeve 108 is used to prevent material and cleaning solutions from seeping into the space between sealing connecting plate 112 and main shaft 109, thereby preventing increased wear. Sealing connecting plate 112 is connected to sealing end cap 121 via screws 120. To prevent material and water from seeping in, a sealing groove and a first O-ring 119 are provided between the two mating surfaces. Sealing end cap 121 is threadedly connected to extrusion housing end cap 124, forming a single unit. A second sealing gasket, a second skeleton oil seal, a vent ring, and a V-shaped rotating seal are located within the inner cavities of sealing end cap 121 and extrusion housing end cap 124, forming a hermetically sealed chamber.

[0043] The sealing end cap 121 is fitted onto the surface of the front cover door bottom plate 123. A second sealing groove is provided on the surface of the sealing end cap 121, and a second O-ring is compressed between the two surfaces. This allows the sealing component, sealing end cap 121, and other related components to move up and down with the upper housing, preventing leakage. Simultaneously, the two holes on the front cover door bottom plate 123, where the upper and lower extrusion wheels are located, are appropriately reduced in the left and right directions to control the upper housing's travel vertically, forming a waist-shaped hole. This keeps the second O-ring 122 away from the edge of the hole, avoiding sealing hazards. The extrusion housing end cap 125 is connected to the upper and lower extrusion housings by screws. The airtight sealing channels 110 of the upper and lower extrusion housings are connected to the vent holes on their respective extrusion housing end caps 124. A third sealing groove is provided on their mating surfaces, and a third O-ring 125 is provided to prevent leakage when sealing the vent holes.

[0044] The upper and lower extrusion sealing structures are exactly the same, and back-flushing materials prevent infiltration. The organic combination of the bidirectional seal of the V-shaped rotary seal ring, the skeleton oil seal, and the sealing gasket prevents the infiltration of materials and the liquid medicine produced during cleaning. The sealing groove structure on the sealing end cover and the end cover of the extrusion box also prevents the leakage of materials and liquid medicine. The extrusion components are well protected by each layer and each seal of the upper and lower extrusion sealing structures, thereby realizing the high sealing function of the extrusion sealing structure of the dry granulator.

Claims

1. A highly enclosed dry-process machine extrusion sealing structure, comprising an extrusion component (1) and a front cover door (2), wherein the extrusion component (1) comprises an upper extrusion box (102) and a lower extrusion box (105), characterized in that: The upper extrusion box (102) is provided with an upper air-sealing quick connector (107), an upper extrusion sealing structure is provided in the upper extrusion box (102), and a pressurized airflow is introduced into the upper extrusion sealing structure through the upper air-sealing quick connector (107), and back-blowing prevents material from penetrating; the lower extrusion box (105) is provided with a lower air-sealing quick connector (106), a lower extrusion sealing structure is provided in the lower extrusion box (105), and a pressurized airflow is introduced into the lower extrusion sealing structure through the lower air-sealing quick connector (106), and back-blowing prevents material from penetrating; The upper extrusion sealing structure comprises a main shaft (109), an extrusion box end cover (124), a front cover door bottom plate (123), a sealing end cover (121) and a sealing connection plate (112), wherein the sealing end cover (121) is threadedly connected to the extrusion box end cover (124), the extrusion box end cover (124) is fixed to the upper extrusion box (102), and the sealing end cover (121) is fixedly connected to the sealing connection plate (112) via a screw member (120); the main shaft ( 109) are sequentially sleeved with a first sealing gasket (113), a first skeleton oil seal (114), a vent baffle ring (115), a second skeleton oil seal (116), a second sealing gasket (117) and a V-shaped rotary sealing ring (118); an air flow channel is provided on the extrusion box end cover (124) at a position corresponding to the vent baffle ring (115); an air sealing channel (110) is provided on the extrusion box (102), and the air sealing channel (110) is connected to the air flow channel; The lower extrusion sealing structure comprises a main shaft (109), an extrusion box end cover (124), a front cover door bottom plate (123), a sealing end cover (121) and a sealing connecting plate (112), wherein the sealing end cover (121) is threadedly connected to the extrusion box end cover (124), the extrusion box end cover (124) is fixed to the lower extrusion box (105), and the sealing end cover (121) is fixedly connected to the sealing connecting plate (112) via a screw member (120); the main shaft ( 109) are sequentially sleeved with a first sealing gasket (113), a first skeleton oil seal (114), a vent baffle ring (115), a second skeleton oil seal (116), a second sealing gasket (117) and a V-shaped rotary sealing ring (118); an air flow channel is provided on the extrusion box end cover (124) at a position corresponding to the vent baffle ring (115); an air sealing channel (110) is provided on the extrusion box (102), and the air sealing channel (110) is connected to the air flow channel; The inner hole of the V-shaped rotary sealing ring (118) is interference-fitted with the outer circle of the main shaft (109), and the beveled edge of the end face of the V-shaped rotary sealing ring (118) is tightly attached to the end face of the sealing end cover (121).

2. The high-sealed dry process machine extrusion sealing structure according to claim 1, characterized in that: The sealing end cover (121) is provided with a sealing groove on a surface matching the sealing connection plate (112), and a first O-type sealing ring (119) is provided in the sealing groove.

3. The high-sealed dry-process machine extrusion sealing structure according to claim 1, characterized in that: The sealing end cover (121) is provided with a sealing groove on the surface that fits with the front cover door bottom plate (123), and a second O-type sealing ring (122) is provided in the sealing groove. The second O-type sealing ring (122) fits between the two surfaces by a set compression amount.

4. The high-sealed dry-process machine extrusion sealing structure according to claim 1, characterized in that: The extrusion box end cover (124) is provided with a sealing groove outside the inlet of the air flow channel, and a third O-ring (125) is provided in the sealing groove to prevent gas leakage.

5. The high-sealed dry process machine extrusion sealing structure according to claim 1, characterized in that: A sealing sleeve (108) is provided on the main shaft (109) outside the sealing connecting plate (112).

6. The high-sealed dry process machine extrusion sealing structure according to claim 1, characterized in that: The two holes on the front cover door bottom plate (123) where the upper extrusion wheel (101) and the lower extrusion wheel (104) are located are both waist-shaped holes, so that the second O-type sealing ring (122) is away from the edge of the hole.

7. The high-sealed dry-process machine extrusion sealing structure according to claim 1, characterized in that: The vent ring (115) has 18 ∮4 air holes evenly distributed on its surface for ventilation.

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