A vacuum-stirred material preparation device

Abstract

This invention relates to the field of mixing device technology, specifically a vacuum mixing material preparation device, including a cylinder, a cylinder cover, a rotating shaft, a mixing paddle assembly, a counterweight compensation assembly, a vacuum tube, a drive component, an equipment box, a lifting mechanism, and a wear warning structure. The upper end of the counterweight compensation assembly extends upward through the rotating shaft, and the wear warning structure is connected to the protruding end of the counterweight compensation assembly to achieve visual monitoring of the wear degree of the mixing paddle. This invention uses a radially sliding mixing paddle assembly, in conjunction with the internal counterweight compensation assembly, to form a linkage transmission, achieving automatic wall-adhesion compensation after the scraper wears, ensuring that the scraper end is always in close contact with the inner wall of the cylinder, eliminating scraper failure and material accumulation and residue problems, thus ensuring the uniformity of material mixing and avoiding material waste; at the same time, the wear warning structure enables visual monitoring of the wear state, allowing for timely replacement of the scraper, greatly improving the convenience of equipment operation and maintenance.

Description

Technical Field

[0001] This invention relates to the field of stirring device technology, specifically a vacuum stirring material preparation device. Background Technology

[0002] Vacuum mixing devices are core equipment in the chemical, pharmaceutical, food, and new materials industries for preparing homogeneous materials. By creating a vacuum within a sealed chamber and rotating an internal stirring paddle, they achieve bubble-free and oxidation-free mixing, ensuring material purity and performance stability. In actual operation, to prevent material from adhering to the inner wall of the cylinder, causing residue waste or uneven mixing, a wall-mounted scraping structure is usually installed. This structure uses scraper blades closely attached to the inner wall of the cylinder to scrape the material.

[0003] However, in practical applications, the scraping structure of existing vacuum mixing devices is mostly fixed. The scraper blades are prone to wear due to long-term friction with the cylinder wall. Once worn, they cannot automatically adhere to the cylinder wall, leading to scraping failure and material residue accumulation. This affects mixing uniformity and causes material waste. To address these issues, there is an urgent need to develop a vacuum mixing material preparation device to solve the maintenance pain points and performance defects of existing equipment. Summary of the Invention

[0004] This invention provides a vacuum stirring material preparation device that achieves adaptive wear and wall-adhesion compensation of the stirring paddle assembly, ensuring long-term scraping effect, and intuitively monitors the wear status of the scraper blades through a visual early warning structure, enabling precise maintenance.

[0005] To achieve the above objectives, the technical solution provided by the present invention is as follows:

[0006] A vacuum stirring material preparation device includes a cylinder, a cylinder cover, a rotating shaft, a stirring paddle assembly, a counterweight compensation assembly, a vacuum tube, a drive component, an equipment box, a lifting mechanism, and a wear warning structure;

[0007] The lifting mechanism is located inside the equipment box and its output end is connected to the cylinder cover. It is used to drive the cylinder cover to lift and lower and to seal with the cylinder body. The rotating shaft is hollow inside, passes through the cylinder cover and is rotatably and sealingly connected with the cylinder cover. The vacuum tube is located on the cylinder cover and is used to realize vacuuming inside the cavity. The driving component is installed on the cylinder cover and is connected to the rotating shaft for transmission, and is used to drive the rotating shaft to rotate.

[0008] Multiple sets of the stirring paddle assemblies are circumferentially arranged on the side wall of the rotating shaft and can slide radially along the rotating shaft. The outer end of the stirring paddle assembly is used to fit against the inner wall of the cylinder to scrape the material. The counterweight compensation assembly is located in the inner cavity of the rotating shaft and is in transmission cooperation with the stirring paddle assembly. It is used to drive the stirring paddle assembly to slide radially and realize wear adaptive wall-fitting compensation.

[0009] The upper end of the counterweight compensation component extends upward through the rotating shaft, and the wear warning structure is connected to the protruding end of the counterweight compensation component to realize the visual monitoring of the wear degree of the stirring paddle.

[0010] Preferably, the stirring paddle assembly includes a stirring rod that is sealed and passes through the rotating shaft, a limiting block is provided at one end of the stirring rod located in the inner cavity of the rotating shaft, and a scraper is provided at the other end of the stirring rod located outside the rotating shaft to fit and abut against the inner wall of the cylinder.

[0011] The counterweight compensation assembly includes a counterweight block that slides axially along the inner cavity of the rotating shaft. The lower end of the counterweight block is formed with a tapered block that engages with the inclined surface of the limiting block. The upper end of the counterweight block extends upward to form a narrow diameter section and passes through the rotating shaft. A first spring provides elastic support between the counterweight block and the top of the inner cavity of the rotating shaft.

[0012] The counterweight moves axially downwards under its own weight and the force of the first spring. Through the inclined plane transmission of the conical block and the limiting block, the stirring rod is driven to extend radially outwards to complete the compensation.

[0013] Preferably, the wear warning structure includes a sealed cavity, an annular warning ring, and a transparent observation window. The sealed cavity is fixedly installed on the top of the cylinder cover, the top end of the rotating shaft extends into the sealed cavity, and the upper narrow section of the counterweight is placed in the sealed cavity.

[0014] The outer wall of the narrow section is provided with several annular warning rings of different colors at equal intervals along the height direction. The front side of the sealed cavity is provided with a transparent observation window for observing the annular warning rings. By observing the annular warning rings, the wear degree can be judged intuitively, realizing a visual passive early warning.

[0015] Preferably, the side wall of the rotating shaft is connected to a limiting cylinder adapted to the limiting block, the stirring rod and the limiting cylinder are in a sealed sliding fit, and a second spring is sleeved on the outer wall of the stirring rod, with the two ends of the second spring abutting against the limiting block and the inner cavity of the limiting cylinder, respectively.

[0016] Preferably, the bottom of the rotating shaft is detachably and sealingly connected to a sealing end cap, the sealing end cap adopts a coaxial inner and outer cylindrical nested structure, and the sealing end cap and the bottom of the rotating shaft are fitted with a double-layer threaded seal.

[0017] Preferably, a clamping assembly is provided at the top of the inner cavity of the sealed cavity. When the cylinder cover is raised to the highest position and opened, the clamping assembly clamps and fixes the upper narrow section of the counterweight block, locks the counterweight block to slide axially, and prevents the stirring paddle assembly from extending outward without restraint.

[0018] Preferably, the clamping assembly includes a clamping cylinder with a bottom opening, an annular airbag, an elastic inflatable component, and a fixing block;

[0019] The upper narrow section of the counterweight is placed inside the clamping cylinder and covers the entire axial stroke. The annular airbag is located on the inner wall of the clamping cylinder. The elastic inflatable component is installed on the top of the sealed cavity and communicates with the annular airbag. The fixed block is located on the side wall of the equipment box and is squeezed and cooperated with the elastic inflatable component.

[0020] When the cylinder cover is opened to its highest position, the fixing block compresses the elastic inflator to inflate, causing the annular airbag to expand and tightly grip the narrow section, thus achieving automatic locking in all open positions.

[0021] Preferably, the outer wall of the narrow section at the upper end of the counterweight and the inner wall of the annular airbag are both uniformly provided with a number of interlocking and matching limiting protrusions along the circumferential direction to improve the rigidity and stability of the clamping and locking.

[0022] Preferably, a guide fixing seat is fixedly provided on the side wall of the equipment box, and the cylinder is fixedly installed on the mounting frame with rollers, and the mounting frame and the guide fixing seat are slidably engaged to realize the pushing and pulling movement of the cylinder.

[0023] Preferably, the mounting bracket is fixedly provided with a positioning strip with positioning holes, and the output end of the lifting mechanism is fixedly provided with a positioning post that is compatible with the positioning holes;

[0024] During the process of closing the cylinder cover and cylinder body, the positioning pin is first inserted into the positioning hole to complete the pre-positioning, and then the cylinder cover and cylinder body are sealed and closed.

[0025] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0026] This invention utilizes a radially sliding stirring paddle assembly, in conjunction with an internal cavity counterweight compensation assembly, to form a linked transmission system. This system enables automatic wall-adhesion compensation after scraper wear, ensuring that the scraper end remains in close contact with the inner wall of the cylinder. This eliminates scraper failure and material accumulation issues, guaranteeing both uniform material mixing and preventing material waste. Furthermore, a wear warning structure enables visual monitoring of wear conditions, allowing for timely scraper replacement. Additionally, a lifting mechanism facilitates automatic lifting and sealing of the cylinder cover, simplifying equipment operation and significantly improving maintenance convenience and operational reliability. Attached Figure Description

[0027] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of the preparation device of the present invention;

[0029] Figure 2This is a schematic diagram of the structure of the cylinder and its connecting components in the preparation device of the present invention;

[0030] Figure 3 for Figure 2 A schematic diagram of the front section structure;

[0031] Figure 4 for Figure 3 Enlarged structural diagram at point A;

[0032] Figure 5 This is a schematic diagram of the rotating shaft and its connecting components in the preparation device of the present invention;

[0033] Figure 6 for Figure 5 Enlarged structural diagram at point B;

[0034] Figure 7 This is an exploded structural diagram of the rotating shaft and counterweight compensation assembly in the preparation device of the present invention.

[0035] The attached diagram lists the components represented by each number as follows:

[0036] 1. Cylinder body; 2. Cylinder cover; 3. Rotating shaft; 30. Limiting cylinder; 31. Sealing end cap; 4. Stirring paddle assembly; 40. Stirring rod; 41. Limiting block; 42. Scraper; 43. Second spring; 5. Counterweight compensation assembly; 50. Counterweight block; 51. Conical block; 52. Narrow diameter section; 53. First spring; 6. Vacuum tube; 7. Driving component; 8. Equipment box; 81. Fixing block; 82. Guide fixing seat; 9. Lifting mechanism; 10. Sealed cavity; 11. Annular warning ring; 12. Transparent observation window; 13. Clamping cylinder; 14. Annular airbag; 15. Elastic inflatable component; 16. Mounting bracket; 17. Positioning strip. Detailed Implementation

[0037] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0038] like Figure 1-7 As shown:

[0039] A vacuum stirring material preparation device includes a cylinder 1, a cylinder cover 2, a rotating shaft 3, a stirring paddle assembly 4, a counterweight compensation assembly 5, a vacuum tube 6, a driving component 7, an equipment box 8, a lifting mechanism 9, and a wear warning structure.

[0040] The lifting mechanism 9 is located inside the equipment box 8 and its output end is connected to the cylinder cover 2. It is used to drive the cylinder cover 2 to lift and lower and to seal with the cylinder body 1. The rotating shaft 3 is hollow inside, passes through the cylinder cover 2 and is rotatably and sealed with the cylinder cover 2. The vacuum tube 6 is located on the cylinder cover 2 and is used to realize vacuuming in the cavity. The driving component 7 is installed on the cylinder cover 2 and is connected to the rotating shaft 3 for transmission, and is used to drive the rotating shaft 3 to rotate.

[0041] Multiple sets of stirring paddle assemblies 4 are arranged circumferentially on the side wall of the rotating shaft 3 and can slide radially along the rotating shaft 3. The outer end of the stirring paddle assembly 4 is used to fit against the inner wall of the cylinder 1 to scrape the material. The counterweight compensation assembly 5 is located in the inner cavity of the rotating shaft 3 and is in transmission cooperation with the stirring paddle assembly 4 to drive the stirring paddle assembly 4 to slide radially and realize wear adaptive wall-fitting compensation.

[0042] The upper end of the counterweight compensation component 5 extends upward through the rotating shaft 3, and the wear warning structure is connected to the protruding end of the counterweight compensation component 5 to realize the visual monitoring of the wear degree of the stirring paddle.

[0043] As described above, this invention utilizes a radially sliding stirring paddle assembly, in conjunction with an internal cavity counterweight compensation assembly, to form a linked transmission, achieving automatic wall-adhesion compensation after scraper wear. This ensures that the scraper end remains in close contact with the inner wall of the cylinder, preventing scraper failure and material accumulation. This guarantees both uniform material mixing and avoids material waste. Furthermore, a wear warning structure enables visual monitoring of wear status, allowing for timely scraper replacement. Additionally, a lifting mechanism enables automatic lifting and sealing of the cylinder cover, simplifying equipment operation and significantly improving equipment maintenance convenience and operational reliability.

[0044] Specifically, the stirring paddle assembly 4 includes a stirring rod 40 that is sealed and passes through the rotating shaft 3. A limiting block 41 is provided at one end of the stirring rod 40 located in the inner cavity of the rotating shaft 3, and a scraper 42 that fits and abuts against the inner wall of the cylinder 1 is provided at the other end of the stirring rod 40 located outside the rotating shaft 3.

[0045] The counterweight compensation component 5 includes a counterweight block 50 that slides axially along the inner cavity of the rotating shaft 3. The lower end of the counterweight block 50 is formed with a tapered block 51 that engages with the inclined surface of the limiting block 41. The upper end of the counterweight block 50 extends upward to form a narrow diameter section 52 and passes through the rotating shaft 3. A first spring 53 provides elastic support between the counterweight block 50 and the top of the inner cavity of the rotating shaft 3.

[0046] The counterweight 50 moves axially downwards by its own weight in conjunction with the elastic force of the first spring 53. Through the inclined plane transmission of the conical block 51 and the limiting block 41, the stirring rod 40 is driven to extend radially outwards to complete the compensation.

[0047] As described above, after the scraper blade wears down, the counterweight moves axially downwards due to its own weight and spring force. Through the inclined plane transmission of the conical block and the limiting block, it automatically drives the stirring rod to extend radially outwards, ensuring that the scraper blade always stays close to the inner wall of the cylinder. The compensation amount adapts to the degree of wear, and no manual adjustment or machine stop is required throughout the process. Furthermore, the limiting block limits the sliding stroke of the stirring rod to prevent excessive extension. This ensures the scraping effect while avoiding excessive squeezing and wear between the scraper blade and the cylinder wall, thus extending the service life of the stirring paddle. It achieves purely mechanical, non-powered wear compensation, requiring no electrical control or pneumatic assistance. The structure is simple and the operation is reliable.

[0048] Specifically, the wear warning structure includes a sealed cavity 10, an annular warning ring 11, and a transparent observation window 12. The sealed cavity 10 is fixedly installed on the top of the cylinder cover 2, the top end of the rotating shaft 3 extends into the sealed cavity 10, and the upper narrow diameter section 52 of the counterweight 50 is placed in the sealed cavity 10.

[0049] The outer wall of the narrow section 52 is provided with several annular warning rings 11 of different colors at equal intervals along the height direction. A transparent observation window 12 is provided on the front side of the sealed cavity 10 for observing the annular warning rings 11. By observing the annular warning rings 11, the wear degree can be judged intuitively, realizing a visual passive early warning.

[0050] As described above, as the counterweight moves axially downwards with the wear of the scraper, different colored warning rings are revealed in sequence. Maintenance personnel can quickly determine the wear level, accurately control the replacement timing, avoid premature replacement causing waste or delayed replacement causing scraper failure, achieve passive and accurate early warning, and reduce the difficulty and cost of equipment maintenance.

[0051] Specifically, the side wall of the rotating shaft 3 is connected to a limiting cylinder 30 that is adapted to the limiting block 41. The stirring rod 40 and the limiting cylinder 30 are in a sealed sliding fit. The outer wall of the stirring rod 40 is fitted with a second spring 43, and the two ends of the second spring 43 respectively abut against the limiting block 41 and the inner cavity end of the limiting cylinder 30.

[0052] As described above, the directional sliding of the stirring rod is achieved through the limiting cylinder, ensuring radial sliding without deviation and improving the flatness of the scraper against the wall; the second spring applies elastic tension to the limiting block, forming a bidirectional transmission cooperation with the counterweight compensation component, achieving pre-tight positioning when the scraper is not worn, and assisting in reset when wear compensation occurs, preventing the stirring rod from moving erratically; at the same time, the stirring rod and the limiting cylinder are sealed and slidingly cooperate to prevent materials or gas from entering the inner cavity of the rotating shaft, ensuring the airtightness of the vacuum chamber and avoiding vacuum leakage from affecting the stirring effect.

[0053] Specifically, the bottom of the rotating shaft 3 is detachably sealed with a sealing end cover 31. The sealing end cover 31 adopts a coaxial inner and outer cylinder nesting structure, and the sealing end cover 31 and the bottom of the rotating shaft 3 are sealed with a double-layer thread seal.

[0054] As can be seen from the above description, the use of a detachable double-layer sealed end cap not only facilitates the disassembly, assembly, inspection and cleaning of the internal components of the rotating shaft, but also significantly improves the sealing performance of the bottom of the rotating shaft through the coaxial inner and outer cylinder nesting + double-layer threaded sealing structure, eliminating gas leakage in a vacuum environment and ensuring stable vacuum in the cavity; the detachable design facilitates the adjustment of the counterweight position, extends the overall service life of the equipment and reduces maintenance costs.

[0055] Specifically, a clamping assembly is provided at the top of the inner cavity of the sealed cavity 10. When the cylinder cover 2 is raised to the highest position and opened, the clamping assembly clamps and fixes the upper narrow diameter section 52 of the counterweight block 50, locking the counterweight block 50 to slide axially and preventing the stirring paddle assembly 4 from extending outward without restraint.

[0056] As can be seen from the above description, the addition of a clamping component automatically locks the counterweight block to prevent axial sliding when the cylinder cover is raised to the highest position. This prevents the counterweight block from moving downwards and causing the agitator to extend outwards without restraint. It effectively prevents the agitator from extending excessively when the cover is opened for feeding or maintenance, which could cause collision damage between the agitator and the cylinder body when the cover is lowered. This protects the scraper and cylinder wall structure. Furthermore, the clamping component automatically releases after the cover is closed, without affecting the normal wear compensation function, thus balancing the safety of opening the cover with the reliability of normal operation.

[0057] Specifically, the clamping assembly includes a clamping cylinder 13 with a bottom opening, an annular airbag 14, an elastic inflatable component 15, and a fixing block 81;

[0058] The upper narrow section 52 of the counterweight 50 is placed inside the clamping cylinder 13 and covers the entire axial stroke. The annular airbag 14 is located on the inner wall of the clamping cylinder 13. The elastic inflatable component 15 is installed on the top of the sealed cavity 10 and communicates with the annular airbag 14. The fixing block 81 is located on the side wall of the equipment box 8 and is squeezed and cooperated with the elastic inflatable component 15.

[0059] When the cylinder cover 2 is opened to the highest position, the fixing block 81 compresses the elastic inflatable component 15 to inflate it, causing the annular airbag 14 to expand and tightly hug the narrow diameter section 52, thus achieving automatic locking in all open positions.

[0060] As can be seen from the above description: the automatic clamping and loosening are achieved by using the lifting stroke of the cylinder cover. When the cover is opened to the highest position, the fixed block squeezes the elastic inflatable component to inflate the annular airbag. The airbag expands and hugs the thin section of the counterweight block to achieve fully automatic locking. When the cover is closed, the elastic inflatable component resets and depressurizes, and the airbag contracts and loosens. No manual operation is required throughout the process. The response is precise and the action is reliable, which is suitable for the automated operation requirements of the equipment.

[0061] Specifically, the outer wall of the narrow section 52 at the upper end of the counterweight 50 and the inner wall of the annular airbag 14 are both uniformly provided with several interlocking and matching limiting protrusions along the circumference to improve the rigidity and stability of the clamping and locking.

[0062] As can be seen from the above description, the interlocking limiting protrusions greatly improve the clamping friction and interlocking degree between the annular airbag and the narrow section, preventing slippage and loosening in the locked state, and ensuring that the stirring paddle assembly is completely fixed without radial movement gaps.

[0063] Specifically, a guide fixing seat 82 is fixedly installed on the side wall of the equipment box 8, and the cylinder 1 is fixedly installed on the mounting frame 16 with rollers. The mounting frame 16 and the guide fixing seat 82 are slidably engaged to realize the pushing and pulling movement of the cylinder 1.

[0064] As can be seen from the above description, by using a roller mounting bracket in conjunction with a guide fixing seat, the cylinder can be moved by pushing and pulling, which facilitates replacement, feeding, unloading, cleaning of the inner wall and overall maintenance. This solves the problem of inconvenience in the operation of traditional fixed cylinders. Moreover, the sliding guide positioning is accurate and can be quickly reset after movement, reducing the cylinder alignment time, improving work efficiency and adapting to large-scale continuous production scenarios.

[0065] Specifically, the mounting bracket 16 is fixedly equipped with a positioning strip 17 with positioning holes, and the output end of the lifting mechanism 9 is fixedly equipped with a positioning post that is compatible with the positioning holes.

[0066] During the process of closing the cover 2 and the cylinder 1, the positioning pin is first inserted into the positioning hole to complete the pre-positioning, and then the cover 2 and the cylinder 1 are sealed and closed.

[0067] As can be seen from the above description: the pre-positioning structure is adopted. When the cover is closed, the positioning pin is first inserted into the positioning hole to complete the precise alignment of the cylinder and the cover, and then the seal is closed. This avoids misalignment and squeezing when the cover is closed, protects the sealing surface and the stirring components, and the positioning and matching structure is simple and has high alignment accuracy. This ensures the sealing fit of the cover and the cylinder after they are closed, further improves the sealing performance of the vacuum chamber, and prevents vacuum leakage caused by misalignment when the cover is closed.

[0068] Embodiment 1 of the present invention is as follows:

[0069] like Figure 1-7 As shown, this vacuum stirring material preparation device is suitable for the preparation of bubble-free and oxidation-free homogeneous materials in the fields of chemical, pharmaceutical, food, and new materials. It includes a cylinder 1, a cylinder cover 2, a rotating shaft 3, a stirring paddle assembly 4, a counterweight compensation assembly 5, a vacuum tube 6, a drive component 7, an equipment box 8, a lifting mechanism 9, as well as a wear warning structure, a clamping assembly, and a positioning guide assembly.

[0070] The equipment box 8 serves as the support base for the entire machine, and the lifting mechanism 9 is fixedly installed inside. The lifting mechanism 9 uses a screw lifting component, and the side wall of its lifting slider is equipped with a connecting rod that is fixedly connected to the side of the cylinder cover 2. This drives the cylinder cover 2 to rise and fall vertically, thereby achieving sealing and locking with the cylinder body 1 or opening and separating the cover. The bottom edge of the cylinder cover 2 is fitted with a sealing rubber ring, which fits tightly with the top end face of the cylinder body 1 after closing, ensuring the airtightness of the cavity.

[0071] The cylinder 1 is fixedly mounted on the mounting frame 16 with rollers. The side wall of the equipment box 8 is fixedly provided with a guide fixing seat 82. The mounting frame 16 and the guide fixing seat 82 are slidably adapted to each other, which can realize the pushing and pulling movement of the cylinder 1, which is convenient for feeding, unloading, cleaning and maintenance. The side of the mounting frame 16 is fixedly connected to a positioning strip 17 with positioning holes. The output end of the lifting mechanism 9 is correspondingly fixedly connected to a positioning column. During the closing process, the positioning column is first inserted into the positioning hole to complete the pre-positioning, and then the cylinder cover 2 and the cylinder 1 are accurately sealed and closed to avoid misalignment and squeezing.

[0072] The rotating shaft 3 is made of hollow steel and vertically penetrates the center of the cylinder cover 2. It is connected to the cylinder cover 2 by a mechanical seal to achieve a rotating seal connection and prevent vacuum leakage. A vacuum tube 6 is installed through the cylinder cover 2. The vacuum tube 6 is connected to a vacuum pump to draw the inner cavity of the cylinder 1 to a negative pressure vacuum state to meet the requirements of non-oxidation and bubble-free stirring of materials.

[0073] The drive unit 7 uses a geared motor and a gear transmission component. The geared motor is fixedly installed on the top surface of the sealed cavity 10. Its output gear transmission component is connected to the outer wall of the rotating shaft 3. After being powered on, it drives the rotating shaft 3 to rotate at a uniform speed. The bottom of the rotating shaft 3 is detachably sealed and connected to the sealing end cover 31. The sealing end cover 31 adopts a coaxial inner and outer cylinder nesting structure and is double-threaded sealed with the bottom of the rotating shaft 3. This ensures the sealing of the inner cavity and facilitates the disassembly and maintenance of the internal components.

[0074] Multiple sets of stirring paddle assemblies 4 are evenly arranged around the rotation shaft 3. Each set of stirring paddle assemblies 4 includes a stirring rod 40, a limiting block 41, a scraper 42, and a second spring 43. The side wall of the rotation shaft 3 is connected to the fixed limiting cylinder 30. The stirring rod 40 is sealed and inserted into the limiting cylinder 30 to achieve radial directional sliding and avoid slippage and deviation.

[0075] One end of the stirring rod 40 located in the inner cavity of the rotating shaft 3 is fixedly connected to the limiting block 41, and the other end located on the outside is detachably connected to the scraper 42. The scraper 42 is made of wear-resistant and flexible material and always fits against the inner wall of the cylinder 1 to achieve follow-up scraping of materials. A second spring 43 is sleeved on the outer wall of the stirring rod 40. The two ends of the second spring 43 abut against the limiting block 41 and the end of the inner cavity of the limiting cylinder 30, respectively, to apply an elastic pre-tightening force to the stirring rod 40, and to achieve bidirectional transmission in conjunction with the counterweight compensation component.

[0076] The counterweight compensation component 5 is located in the inner cavity of the rotating shaft 3 and includes a counterweight block 50 and a first spring 53. The counterweight block 50 is slidably arranged along the inner cavity of the rotating shaft 3, and the lower end is formed into a conical block 51, which is in transmission cooperation with the inclined surface of the limiting block 41. The upper end of the counterweight block 50 extends upward to form a narrow diameter section 52, which passes through the top of the rotating shaft 3. The first spring 53 is elastically supported between the top surface of the counterweight block 50 and the top of the inner cavity of the rotating shaft 3.

[0077] After long-term friction and wear, the counterweight 50 moves axially downward by its own weight and the elastic force of the first spring 53. Through the inclined surface transmission of the conical block 51 and the limiting block 41, it automatically drives the stirring rod 40 to extend radially outward, compensating for the wear of the scraper 42 and keeping the scraper 42 in close contact with the inner wall of the cylinder 1. The limiting block 41 limits the maximum sliding stroke of the stirring rod 40 to prevent excessive extension and avoid excessive squeezing and wear between the scraper 42 and the cylinder wall.

[0078] The wear warning structure consists of a sealed cavity 10, an annular warning ring 11, and a transparent observation window 12. The sealed cavity 10 is fixedly installed on the top surface of the cylinder cover 2, the top end of the rotating shaft 3 extends into the sealed cavity 10, and the upper narrow diameter section 52 of the counterweight 50 is suspended in the sealed cavity 10. Several annular warning rings 11 of different colors are evenly spaced along the height direction on the outer wall of the narrow diameter section 52, and the transparent observation window 12 is embedded on the front side of the sealed cavity 10.

[0079] As the wear of the scraper 42 intensifies, the counterweight 50 continues to move downwards, causing the narrow section 52 to descend. Different colored annular warning rings 11 are revealed sequentially through the transparent observation window 12. Maintenance personnel can directly observe the color of the warning rings to quickly determine the wear level of the scraper 42, accurately control the timing of replacement, and achieve visual passive early warning.

[0080] The top of the inner cavity of the sealed cavity 10 is provided with a clamping assembly, including a clamping cylinder 13, an annular airbag 14, an elastic inflatable component 15, and a fixing block 81. The transparent observation window 12 is located below the clamping cylinder 13. The bottom of the clamping cylinder 13 is open and fixed to the top wall of the sealed cavity 10. The upper end of the counterweight 50 with a narrow diameter section 52 extends into the inside of the clamping cylinder 13 and covers the entire axial stroke. The annular airbag 14 is fitted and fixed to the inner wall of the clamping cylinder 13. The elastic inflatable component 15 is installed on the top of the sealed cavity 10 and communicates with the inside of the annular airbag 14. The fixing block 81 is fixed to the side wall of the equipment box 8 and corresponds to the position of the elastic inflatable component 15.

[0081] When the cylinder cover 2 is raised to the highest position and opened, the fixing block 81 squeezes the elastic inflator 15, causing it to inflate the annular airbag 14. The airbag expands and hugs the narrow section 52, locking the counterweight 50 to slide axially and preventing the stirring paddle assembly 4 from extending outward without restraint. The outer wall of the narrow section 52 and the inner wall of the annular airbag 14 are provided with interlocking limiting protrusions to improve clamping friction and locking stability and prevent movement.

[0082] When the cylinder cover 2 is lowered and closed, the fixing block 81 disengages from the elastic inflatable component 15, the elastic inflatable component 15 automatically resets and depressurizes, the annular airbag 14 contracts and loosens, and the counterweight 50 restores its axial sliding ability, without affecting the normal wear compensation function.

[0083] The specific working process of the above embodiments is as follows:

[0084] First, the cylinder 1 containing the material is pushed to the side of the equipment box 8 by the bottom rollers, so that the mounting frame 16 and the guide fixing seat 82 are precisely aligned, and the cylinder 1 is initially positioned. Then, the lifting mechanism 9 is started, and the lifting mechanism 9 drives the cylinder cover 2 to move vertically downward. The positioning pin at the output end of the lifting mechanism 9 is inserted into the positioning hole on the positioning strip 17 of the mounting frame 16 first, so as to achieve the coaxial pre-positioning of the cylinder 1 and the cylinder cover 2 and avoid misalignment when closing the cover. After the positioning is in place, the cylinder cover 2 continues to move downward until the bottom sealing ring is tightly attached to the top end face of the cylinder 1 to form a sealed cavity, and the cover is closed and sealed.

[0085] After the lid is closed, the external vacuum pump is turned on, and the vacuum tube 6 on the lid 2 continuously evacuates the inner cavity of the cylinder 1 until the preset vacuum degree is reached, creating a bubble-free and oxidation-free stirring environment. Then, the drive unit 7 (reduction motor) is started. The motor drives the hollow rotating shaft 3 to rotate at a constant speed through the gear transmission component. The multiple sets of stirring paddle assemblies 4 arranged in the circumference rotate synchronously with the rotating shaft 3 to homogenize the material in the cylinder. During the stirring process, the scraper 42 at the end of the stirring rod 40 is always in close contact with the inner wall of the cylinder 1, and scrapes off the material adhering to the cylinder wall synchronously with the stirring action to prevent material residue accumulation and ensure the uniformity of material stirring.

[0086] After prolonged mixing, the scraper 42 wears down due to friction with the inner wall of the cylinder 1, increasing the gap between the scraper 42 and the cylinder wall. At this time, the counterweight compensation component 5 activates its compensation action. The counterweight block 50 slides vertically downward along the inner cavity of the rotating shaft 3 under its own weight and with the elastic thrust of the first spring 53. The conical block 51 at the lower end of the counterweight block 50 and the limiting block 41 at the end of the stirring rod 40 form an inclined plane transmission, continuously squeezing the limiting block 41 and driving the stirring rod 40 to slide radially outward along the limiting cylinder 30, automatically compensating for the wear of the scraper 42 and keeping the scraper 42 always in contact with the inner wall of the cylinder 1. The second spring 43 simultaneously applies an elastic tension to the limiting block 41, forming a bidirectional transmission cooperation with the counterweight block 50 to prevent the stirring rod 40 from moving around. The limiting block 41 limits the maximum outward stroke of the stirring rod 40, preventing the scraper 42 from being excessively squeezed against the cylinder wall and causing secondary wear.

[0087] As the counterweight 50 moves downward with the wear of the scraper 42, the narrow section 52 at its upper end extends downward synchronously from the rotating shaft 3. The different colored annular warning rings 11 on the outer wall of the narrow section 52 move sequentially to the visible area of ​​the transparent observation window 12. Thus, maintenance personnel can quickly determine the wear level of the scraper 42 by directly observing the color of the exposed warning rings through the transparent observation window 12 without disassembling the machine or using testing instruments. This allows for accurate judgment of the replacement timing and avoids premature replacement that would waste consumables or delayed replacement that would lead to scraper failure.

[0088] When the mixing operation is completed or when maintenance or material addition is required, the lifting mechanism 9 controls the cylinder cover 2 to rise vertically to the highest position. When the cylinder cover 2 reaches the limit position, the elastic inflatable component 15 at the top of the sealed cavity 10 and the fixing block 81 on the side wall of the equipment box 8 squeeze each other. The elastic inflatable component 15 is pressurized into the annular air bladder 14. After the annular air bladder 14 expands, it hugs the thin diameter section 52 of the counterweight 50. With the biting force of the limiting protrusion, the axial sliding of the counterweight 50 is completely locked, thereby limiting the radial extension of the mixing paddle assembly 4 and preventing the mixing paddle from moving without restraint after the cover is opened. After locking, the mounting bracket 16 can be pushed and pulled along the guide fixing seat 82 to move the cylinder 1 out of the working position for unloading, material addition, cylinder wall cleaning or equipment maintenance operations.

[0089] After maintenance and material addition are completed, the mounting frame 16 is pushed back to the original position of the guide fixing seat 82, and the lifting mechanism 9 is restarted to drive the cylinder cover 2 to descend and close. During the descent of the cylinder cover 2, the elastic inflatable component 15 separates from the fixing block 81, the elastic inflatable component 15 automatically resets and depressurizes, the annular airbag 14 contracts and releases the narrow diameter section 52, the counterweight 50 restores its axial sliding ability, and the wear adaptive compensation function restarts simultaneously. Then, vacuuming can be performed again and stirring can be started to enter the next round of operation cycle.

[0090] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "setting," "connection," "fixing," "screw connection," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components or the interaction between two components. Unless otherwise explicitly limited, those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0091] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that variations may be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A vacuum stirring material preparation device, characterized in that: It includes a cylinder (1), a cylinder cover (2), a rotating shaft (3), a stirring paddle assembly (4), a counterweight compensation assembly (5), a vacuum tube (6), a drive component (7), an equipment box (8), a lifting mechanism (9), and a wear warning structure; The lifting mechanism (9) is located inside the equipment box (8) and its output end is connected to the cylinder cover (2). It is used to drive the cylinder cover (2) to lift and lower and to seal with the cylinder body (1). The rotating shaft (3) is hollow inside, passes through the cylinder cover (2) and is rotatably and sealed with the cylinder cover (2). The vacuum tube (6) is located on the cylinder cover (2) and is used to realize vacuuming in the cavity. The driving component (7) is installed on the cylinder cover (2) and is connected to the rotating shaft (3) for driving the rotating shaft (3) to rotate. Multiple sets of the stirring paddle assemblies (4) are arranged circumferentially on the side wall of the rotating shaft (3) and can slide radially along the rotating shaft (3). The outer end of the stirring paddle assembly (4) is used to fit against the inner wall of the cylinder (1) to scrape the material. The counterweight compensation assembly (5) is located in the inner cavity of the rotating shaft (3) and is in transmission cooperation with the stirring paddle assembly (4) to drive the stirring paddle assembly (4) to slide radially and realize wear adaptive wall-fitting compensation. The upper end of the counterweight compensation component (5) extends upward through the rotating shaft (3), and the wear warning structure is connected to the protruding end of the counterweight compensation component (5) to realize the visual monitoring of the wear degree of the stirring paddle; The stirring paddle assembly (4) includes a stirring rod (40) that is sealed and passes through the rotating shaft (3). A limiting block (41) is provided at one end of the stirring rod (40) located in the inner cavity of the rotating shaft (3), and a scraper (42) that fits and abuts against the inner wall of the cylinder (1) is provided at one end of the stirring rod (40) located outside the rotating shaft (3). The counterweight compensation component (5) includes a counterweight block (50) that slides axially along the inner cavity of the rotating shaft (3). The lower end of the counterweight block (50) is formed with a tapered block (51) that engages with the inclined surface of the limiting block (41). The upper end of the counterweight block (50) extends upward to form a narrow diameter section (52) and passes through the rotating shaft (3). A first spring (53) provides elastic support between the counterweight block (50) and the top of the inner cavity of the rotating shaft (3). The counterweight (50) moves axially downward by its own weight in conjunction with the elastic force of the first spring (53), and through the inclined plane transmission of the conical block (51) and the limiting block (41), it drives the stirring rod (40) to extend radially outward to complete the compensation.

2. The vacuum stirring material preparation device according to claim 1, characterized in that: The wear warning structure includes a sealed cavity (10), an annular warning ring (11), and a transparent observation window (12). The sealed cavity (10) is fixedly installed on the top of the cylinder cover (2). The top end of the rotating shaft (3) extends into the sealed cavity (10), and the upper narrow diameter section (52) of the counterweight (50) is placed in the sealed cavity (10). The outer wall of the narrow section (52) is provided with several annular warning rings (11) of different colors at equal intervals along the height direction. The front side of the sealed cavity (10) is provided with a transparent observation window (12) for observing the annular warning rings (11). By observing the annular warning rings (11), the wear level can be intuitively judged, and a visual passive early warning can be realized.

3. The vacuum stirring material preparation device according to claim 1, characterized in that: The side wall of the rotating shaft (3) is connected to a limiting cylinder (30) that is adapted to the limiting block (41). The stirring rod (40) and the limiting cylinder (30) are sealed and slidably engaged. The outer wall of the stirring rod (40) is fitted with a second spring (43), and the two ends of the second spring (43) abut against the limiting block (41) and the inner cavity end of the limiting cylinder (30) respectively.

4. The vacuum stirring material preparation device according to claim 1, characterized in that: The bottom of the rotating shaft (3) is detachably sealed with a sealing end cap (31). The sealing end cap (31) adopts a coaxial inner and outer cylinder nesting structure, and the sealing end cap (31) and the bottom of the rotating shaft (3) are sealed with a double-layer thread seal.

5. The vacuum stirring material preparation apparatus according to claim 2, characterized in that: The top of the inner cavity of the sealed cavity (10) is provided with a clamping assembly. When the cylinder cover (2) is raised to the highest position and opened, the clamping assembly clamps and fixes the upper narrow diameter section (52) of the counterweight block (50), locks the counterweight block (50) to slide axially, and prevents the stirring paddle assembly (4) from extending outward without restraint.

6. The vacuum stirring material preparation apparatus according to claim 5, characterized in that: The clamping assembly includes a clamping cylinder (13) with a bottom opening, an annular airbag (14), an elastic inflatable element (15), and a fixing block (81). The upper narrow section (52) of the counterweight (50) is placed inside the clamping cylinder (13) and covers the entire axial stroke. The annular airbag (14) is located on the inner wall of the clamping cylinder (13). The elastic inflatable element (15) is installed on the top of the sealed cavity (10) and communicates with the annular airbag (14). The fixing block (81) is located on the side wall of the equipment box (8) and is squeezed and cooperated with the elastic inflatable element (15). When the cylinder cover (2) is opened to the highest position, the fixing block (81) squeezes the elastic inflatable component (15) to inflate it, causing the annular airbag (14) to expand and tightly hug the narrow diameter section (52), thus achieving automatic locking in all open positions.

7. The vacuum stirring material preparation apparatus according to claim 6, characterized in that: The outer wall of the upper narrow section (52) of the counterweight (50) and the inner wall of the annular airbag (14) are uniformly provided with several interlocking and matching limiting protrusions along the circumferential direction to improve the rigidity and stability of clamping and locking.

8. The vacuum stirring material preparation apparatus according to claim 2, characterized in that: The equipment box (8) is fixedly provided with a guide fixing seat (82) on its side wall. The cylinder (1) is fixedly installed on the mounting frame (16) with rollers, and the mounting frame (16) and the guide fixing seat (82) slide together to realize the pushing and pulling movement of the cylinder (1).

9. The vacuum stirring material preparation apparatus according to claim 8, characterized in that: The mounting bracket (16) is fixedly provided with a positioning strip (17) with a positioning hole, and the output end of the lifting mechanism (9) is fixedly provided with a positioning post that is compatible with the positioning hole. During the process of closing the cover (2) and the body (1), the positioning pin is first inserted into the positioning hole to complete the pre-positioning, and then the cover (2) and the body (1) are sealed and closed.

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