Automatic pneumatic pipeline conveying device for powder materials

Abstract

The present application relates to the technical field of conveying, and discloses a kind of powder material pneumatic pipeline automatic conveying device, including the negative pressure pipe connected in the input end of vacuum pump.The present application is rotated by driving motor and connecting head, because sleeve and connecting head synchronous rotation and with the thread groove on connecting pipe meshing, sleeve will rotate along thread groove with connecting head, in turn drive connecting cover and extension pipe to extend from suction hole, realize height compensation, maintain suction height consistent, avoid the interruption of conveying caused by powder liquid level drop;When large particle and caked material appear in adsorption later stage, connecting head rotation drives guide column synchronous rotation, will move along the slope of guide column, in turn drive sealing plate to move, seal the extension pipe corresponding to three non-adjacent connecting cover;In the case where the negative pressure power of vacuum pump is unchanged, the number of suction holes is reduced, which can improve the suction force of a single suction hole, accurately adapt to the adsorption demand of large particles and caked material in later stage, without replacing equipment to adapt to different material conveying.

Description

Technical Field

[0001] This invention belongs to the field of conveying technology, and more specifically, relates to an automatic pneumatic pipeline conveying device for powder materials. Background Technology

[0002] Pneumatic pipeline conveying devices for powdered materials are widely used in chemical, food, building materials, and pharmaceutical industries for long-distance, automated conveying of various powdered materials such as flour, cement, plastic granules, and pharmaceutical powders, thanks to their advantages of high conveying efficiency, good sealing, and low risk of contamination. The core working principle is to generate negative pressure in the pipeline through a vacuum pump, and use the negative pressure suction to draw the material in from the suction end and convey it along the pipeline to the designated discharge position. It is a key piece of equipment in industrial production that connects the storage, processing, and packaging of powdered materials.

[0003] However, existing pneumatic pipeline conveying devices for powdered materials still have significant drawbacks in practical applications, affecting the continuity of conveying and the utilization rate of materials. When the powder is adsorbed by the crane operator, the height gradually decreases as the conveying process continues. However, the suction structure of traditional devices has a fixed height. When the powder height is lower than the effective range of the suction structure, an air gap will form between the suction end and the powder. This not only prevents timely material intake but also easily leads to empty suction, causing conveying interruptions and severely reducing efficiency. Furthermore, as the powder height decreases, it will stratify due to differences in particle size. Fine powder will be preferentially sucked in, leaving large particles or clumps at the bottom. Moreover, the height of the clumps increases, and the suction force decreases, making it impossible to effectively adsorb them. The large amount of residue not only causes waste and increases costs but also disrupts the continuity of conveying.

[0004] In view of this, the present invention is proposed. Summary of the Invention

[0005] To solve the above-mentioned technical problems, the basic concept of the technical solution adopted by the present invention is as follows: An automatic pneumatic pipeline conveying device for powdered materials includes a negative pressure pipe connected to the input end of a vacuum pump.

[0006] The negative pressure pipe outlet is equipped with a connecting pipe, the end of the connecting pipe is equipped with a connector, and the connector has six suction holes. The connector is equipped with a drive motor, which is used to change the angle of the connector on the connector. The connecting pipe is equipped with a sleeve that rotates synchronously with the connector, and the sleeve engages with the threaded groove on the connecting pipe. The sleeve is equipped with a connecting cover corresponding to the suction hole, and an extension tube is inserted into the connecting cover. The extension tube is inserted into the corresponding suction hole. The rotation of the connector drives the sleeve to rotate on the threaded groove, driving the extension tube to extend out of the suction hole, ensuring that the suction height is maintained at the same height. A sealing plate is inserted into each of the three non-adjacent connecting covers. A synchronization plate is installed at one end of each sealing plate. A guide post is installed on each connecting head. A ramp is provided on the guide post, and the synchronization plate is slidably connected to the guide post. The ramp is used to drive the sealing plate to move and seal the corresponding extension tube. By reducing the number of suction holes, the suction force is increased, thereby adapting to the adsorption of large particles and agglomerated materials in the later stage.

[0007] In a preferred embodiment of the present invention, a connecting flange is installed at one end of the negative pressure pipe. The connecting flange has several pairs of mounting holes, and bolts are inserted into the several pairs of mounting holes. The mounting holes facilitate the connection between the connecting flange and the vacuum pump input end.

[0008] In a preferred embodiment of the present invention, a slide rail is provided on the side wall of the connector, and a slide groove is provided at the end of the connecting pipe. The slide rail is slidably disposed inside the slide groove. A crossbeam is installed on the inner side wall of the connecting pipe, and a protective cover is installed on the crossbeam. A drive motor is installed inside the protective cover, and a synchronous shaft is installed at the output end of the drive motor. The end of the synchronous shaft is connected to the center position of the connector.

[0009] In a preferred embodiment of the present invention, a threaded sleeve is installed at the end of the sleeve, the inner diameter of the threaded sleeve being larger than the inner diameter of the sleeve, to ensure that the sleeve and the threaded groove do not interfere with each other, and the threaded sleeve and the threaded groove are engaged.

[0010] In a preferred embodiment of the present invention, a slider is installed on the inner side wall of the sleeve, a through groove is opened on the side wall of the connector, the slider is slidably disposed inside the through groove, a guide rod is installed through the through groove, the guide rod is movably connected to the slider, a compression spring is sleeved on the guide rod, one end of the compression spring is engaged with the side wall of the through groove, and the other end of the compression spring is engaged with the side wall of the slider.

[0011] In a preferred embodiment of the present invention, a connecting frame is provided on the side wall of the connecting cover, the connecting frame is connected to the inner side wall of the sleeve, and a cover plate is installed at the end of the sleeve by bolts. The cover plate has a plurality of pairs of notches, and the plurality of pairs of notches correspond to the corresponding extension tubes.

[0012] In a preferred embodiment of the present invention, a piston is installed on the outer wall of the extension tube, and the end of the piston is slidably connected to the inner wall of the suction hole.

[0013] In a preferred embodiment of the present invention, the connecting cover has a through hole, the sealing plate is slidably disposed on the side wall of the through hole, a fixing plate is installed on the side wall of the sealing plate, an insert rod is installed on the fixing plate, a positioning cover is inserted into the side wall of the insert rod, an mounting plate is installed on the positioning cover, and the mounting plate is connected to the side wall of the connecting cover, a reinforcing rib is installed between the mounting plate and the positioning cover, a baffle is slidably disposed on the inner side wall of the positioning cover, one end of the baffle is connected to the insert rod, and a limit spring is installed between the other end of the baffle and the side wall of the positioning cover, the compression direction of the limit spring and the movement direction of the insert rod are on the same straight line.

[0014] In a preferred embodiment of the present invention, a limiting rod is movably disposed through the synchronization plate. One end of the limiting rod is installed on the side wall of the connecting cover, and a limiting plate is installed on the other end of the limiting rod. The diameter of the limiting plate is larger than the diameter of the limiting rod.

[0015] In a preferred embodiment of the present invention, a countersunk groove is provided on the connector head, and a guide post is installed on the countersunk groove. The diameter of the guide post near the inside of the countersunk groove is smaller than the diameter of the outer side. A top block is installed on the synchronization plate, and a ball is installed at the end of the top block, and the ball is slidably connected to the side wall of the guide post.

[0016] Compared with the prior art, the present invention has the following advantages: This invention features adaptive adjustment of material suction height and dynamic adaptation of suction force, ensuring continuous and versatile conveying without manual intervention. During adsorption, as the powder height decreases, the drive motor rotates the connector. Because the sleeve rotates synchronously with the connector and engages with the threaded groove on the connecting pipe, the sleeve moves along the threaded groove as the connector rotates, thereby causing the connecting cover and extension pipe to extend from the suction port. This achieves automatic suction height compensation, maintaining a consistent suction height and preventing conveying interruptions due to a drop in powder level. In the later stages of adsorption, when large particles and agglomerated materials appear, the connector rotation drives the guide column to rotate synchronously. The synchronous plate slides along the guide column's slope, causing the sealing plate to move and seal the extension pipes corresponding to the three non-adjacent connecting covers. With the vacuum pump's negative pressure power remaining constant, reducing the number of suction ports increases the suction force of a single suction port, precisely adapting to the adsorption needs of large particles and agglomerated materials in the later stages, allowing for the conveying of different materials without equipment replacement.

[0017] The specific embodiments of the present invention will now be described in further detail with reference to the accompanying drawings. Attached Figure Description

[0018] In the attached diagram: Figure 1 A three-dimensional diagram of an automatic pneumatic pipeline conveying device for powder materials; Figure 2This is a side view of an automatic pneumatic pipeline conveying device for powder materials; Figure 3 A bottom view of an automatic pneumatic pipeline conveying device for powder materials; Figure 4 A cross-sectional view of the connecting pipe of an automatic pneumatic pipeline conveying device for powder materials; Figure 5 An automatic pneumatic pipeline conveying device for powder materials Figure 4 Enlarged view of point A in the middle; Figure 6 This is an assembly diagram of the connector and connecting pipe of an automatic pneumatic pipeline conveying device for powder materials. Figure 7 A 3D view of the connector of an automatic pneumatic pipeline conveying device for powder materials; Figure 8 A 3D view of the connection cover of an automatic pneumatic pipeline conveying device for powder materials; Figure 9 A cross-sectional view of the connector of an automatic pneumatic pipeline conveying device for powder materials. Figure 1 ; Figure 10 An automatic pneumatic pipeline conveying device for powder materials Figure 9 Enlarged view at point B in the middle; Figure 11 A cross-sectional view of the connector of an automatic pneumatic pipeline conveying device for powder materials. Figure 2 ; Figure 12 This is a cross-sectional view of the positioning cover of an automatic pneumatic pipeline conveying device for powder materials.

[0019] In the diagram: 1. Negative pressure pipe; 11. Connecting flange; 111. Mounting hole; 12. Connecting pipe; 13. Connector; 131. Suction port; 132. Slide rail; 133. Slide groove; 14. Drive motor; 141. Protective cover; 142. Crossbeam; 143. Synchronous shaft; 2. Sleeve; 21. Threaded sleeve; 211. Threaded groove; 212. Cover plate; 213. Notch; 214. Slider; 215. Through groove; 216. Guide rod; 217. Compression spring; 22. Connecting cover; 221. Connecting bracket; 222. Extension tube; 223. Piston; 23. Sealing plate; 231. Through hole; 232. Positioning cover; 233. Mounting plate; 234. Reinforcing rib; 235. Insert rod; 236. Fixing plate; 237. Baffle; 238. Limiting spring; 24. Synchronizing plate; 241. Limiting rod; 242. Limiting plate; 25. Guide post; 251. Ramp; 252. Top block; 253. Ball bearing; 254. Countersunk groove. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the accompanying drawings. The following embodiments are used to illustrate the present invention.

[0021] Example 1: like Figures 1 to 12 As shown, an automatic pneumatic pipeline conveying device for powder materials includes a negative pressure pipe 1 connected to the input end of a vacuum pump.

[0022] A connecting pipe 12 is installed at the outlet of the negative pressure pipe 1. A connector 13 is installed at the end of the connecting pipe 12. The connector 13 has six suction holes 131. A drive motor 14 is installed on the connector 13. The drive motor 14 is used to drive the connector 13 to change the angle of the connector 13. A sleeve 2 that rotates synchronously with the connector 13 is installed on the connecting pipe 12, and the sleeve 2 is engaged with the threaded groove 211 on the connecting pipe 12. A connecting cover 22 corresponding to the suction hole 131 is installed on the sleeve 2, and an extension tube 222 is inserted into the connecting cover 22. The extension tube 222 is inserted into the corresponding suction hole 131. The rotation of the connector 13 drives the sleeve 2 to rotate on the threaded groove 211, and drives the extension tube 222 to extend out from the suction hole 131, ensuring that the suction height is maintained at the same height. A sealing plate 23 is inserted into three non-adjacent connecting covers 22. A synchronization plate 24 is installed at one end of the sealing plate 23. A guide post 25 is installed on the connector 13. A ramp 251 is opened on the guide post 25. The synchronization plate 24 is slidably connected to the guide post 25. The ramp 251 is used to drive the sealing plate 23 to move and make the corresponding extension tube 222 sealed. By reducing the number of suction holes 131, the suction force is increased, which is suitable for the adsorption of large particles and agglomerated materials in the later stage.

[0023] like Figures 1 to 12 As shown in the specific embodiment, a connecting flange 11 is installed at one end of the negative pressure pipe 1. The connecting flange 11 has several pairs of mounting holes 111, and bolts are inserted into these mounting holes 111. The mounting holes 111 facilitate the connection between the connecting flange 11 and the vacuum pump input end. Through the bolted connection structure between the connecting flange 11 and the mounting holes 111, a stable connection between the negative pressure pipe 1 and the vacuum pump input end is achieved, preventing negative pressure leakage due to loose connections during negative pressure conveying. This ensures the stable establishment of the negative pressure environment in the device and provides a reliable power foundation for material suction.

[0024] like Figures 1 to 12As shown, the connector 13 has a slide rail 132 on its side wall and a groove 133 at the end of the connecting pipe 12. The slide rail 132 is slidably disposed inside the groove 133. A crossbeam 142 is installed on the inner side wall of the connecting pipe 12, and a protective cover 141 is installed on the crossbeam 142. A drive motor 14 is installed inside the protective cover 141, and a synchronous shaft 143 is installed at the output end of the drive motor 14. The end of the synchronous shaft 143 is connected to the center of the connector 13. The sliding cooperation between the slide rail 132 and the groove 133 ensures the stability and coaxiality of the connector 13 during rotation. The protective cover 141 protects the drive motor 14, preventing powder from entering the motor and affecting its operation. The synchronous shaft 143 ensures that the power of the drive motor 14 is accurately transmitted to the connector 13, improving the overall operational reliability.

[0025] Example 2: The difference between the above embodiments and this embodiment is that: Figures 1 to 12 As shown, a threaded sleeve 21 is installed at the end of the sleeve 2. The inner diameter of the threaded sleeve 21 is larger than that of the sleeve 2 to ensure that the sleeve 2 does not interfere with the threaded groove 211. The threaded sleeve 21 and the threaded groove 211 are engaged. The added threaded sleeve 21, by increasing its inner diameter, effectively avoids direct interference between the sleeve 2 and the threaded groove 211 of the connecting pipe 12, ensuring smooth engagement and transmission of the sleeve 2 along the threaded groove 211, and ensuring the stable operation of the extension pipe 222's telescopic adjustment.

[0026] like Figures 1 to 12 As shown, in a specific embodiment, a slider 214 is installed on the inner wall of the sleeve 2, and a through groove 215 is opened on the side wall of the connector 13. The slider 214 is slidably disposed inside the through groove 215. A guide rod 216 is installed through the through groove 215, and the guide rod 216 is movably connected to the slider 214. A compression spring 217 is sleeved on the guide rod 216. One end of the compression spring 217 is engaged with the side wall of the through groove 215, and the other end of the compression spring 217 is engaged with the side wall of the slider 214. Through the cooperation of the slider 214, the through groove 215, and the guide rod 216, the movement trajectory of the sleeve 2 when rotating with the connector 13 is limited, ensuring the accuracy of adjustment. The compression spring 217 plays a buffering role in the movement of the sleeve 2, preventing the extension tube 222 from colliding and being damaged by the material due to the excessively fast movement of the sleeve 2, thus improving the safety of the structure during operation.

[0027] like Figures 1 to 12As shown, furthermore, a connecting frame 221 is provided on the side wall of the connecting cover 22, which is connected to the inner side wall of the sleeve 2. A cover plate 212 is bolted to the end of the sleeve 2, and several pairs of notches 213 are provided on the cover plate 212, which correspond to the corresponding extension tubes 222. The connecting frame 221 strengthens the connection between the connecting cover 22 and the sleeve 2, ensuring that the connecting cover 22 moves synchronously with the sleeve 2; the notches 213 on the cover plate 212 precisely avoid the extension tubes 222, preventing the cover plate 212 from interfering with the extension and retraction of the extension tubes 222, and ensuring smooth adjustment of the extension tubes 222.

[0028] like Figures 1 to 12 As shown, in a specific embodiment, a piston 223 is installed on the outer wall of the extension tube 222, and the end of the piston 223 is slidably connected to the inner wall of the suction port 131. The sliding engagement between the piston 223 on the outer wall of the extension tube 222 and the inner wall of the suction port 131 enhances the sealing performance during the extension and retraction of the extension tube 222, effectively preventing negative pressure leakage from the gap between the extension tube 222 and the suction port 131, ensuring a stable negative pressure environment in the device, and improving adsorption efficiency.

[0029] like Figures 1 to 12 As shown, the connecting cover 22 further includes a through hole 231, a sealing plate 23 slidably disposed on the side wall of the through hole 231, a fixing plate 236 mounted on the side wall of the sealing plate 23, an insert rod 235 mounted on the fixing plate 236, a positioning cover 232 inserted into the side wall of the insert rod 235, an mounting plate 233 mounted on the positioning cover 232, and the mounting plate 233 is connected to the side wall of the connecting cover 22. A reinforcing rib 234 is installed between the mounting plate 233 and the positioning cover 232. A baffle 237 is slidably disposed on the inner side wall of the positioning cover 232. One end of the baffle 237 is connected to the insert rod 235, and a limit spring 238 is installed between the other end of the baffle 237 and the side wall of the positioning cover 232. The compression direction of the limit spring 238 and the movement direction of the insert rod 235 are on the same straight line. The sliding trajectory of the sealing plate 23 is limited by the through hole 231. The positioning cover 232, the mounting plate 233 and the reinforcing rib 234 improve the support stability of the insertion rod 235. The limiting spring 238 applies an elastic force to the insertion rod 235 through the baffle 237 to ensure that the sealing plate 23 is stable after sealing the extension tube 222, avoids sealing failure due to vibration, and ensures reliable suction adjustment.

[0030] like Figures 1 to 12As shown, a limiting rod 241 is movably installed through the synchronizing plate 24. One end of the limiting rod 241 is installed on the side wall of the connecting cover 22, and the other end of the limiting rod 241 is installed with a limiting plate 242. The diameter of the limiting plate 242 is larger than the diameter of the limiting rod 241. Through the cooperation of the limiting rod 241 and the limiting plate 242, the movement range of the synchronizing plate 24 is limited, preventing the sealing plate 23 from being misaligned or damaged due to excessive movement of the synchronizing plate 24, and ensuring that the adjustment action of the synchronizing plate 24 driving the sealing plate 23 is precise and controllable.

[0031] like Figures 1 to 12 As shown, the connector 13 further includes a countersunk groove 254, on which a guide post 25 is mounted. The diameter of the guide post 25 closer to the inside of the countersunk groove 254 is smaller than that of the outer side. A top block 252 is mounted on the synchronization plate 24, and a ball bearing 253 is mounted at the end of the top block 252, with the ball bearing 253 slidably connected to the side wall of the guide post 25. The countersunk groove 254 ensures the stable installation of the guide post 25. The variable diameter design of the guide post 25 facilitates the smooth sliding of the ball bearing 253 on the top block 252 along the slope 251. The ball bearing 253 reduces the sliding friction between the synchronization plate 24 and the guide post 25, reducing component wear and improving the smoothness of the adjustment action and the service life of the structure.

[0032] The implementation principle of the automatic pneumatic pipeline conveying device for powder materials of the present invention is as follows: First, before starting the device, bolts must be inserted through the mounting holes 111 on the connecting flange 11 to securely connect the negative pressure pipe 1 to the vacuum pump input. After the vacuum pump starts, a negative pressure environment will be formed inside the negative pressure pipe 1, connecting pipe 12, and connector 13, providing the power basis for the suction of powder materials. At this time, the six suction holes 131 on the connector 13 are in the initial conductive state, and the powder materials can enter the device through the suction holes 131. Meanwhile, the sliding groove 133 at the end of the connecting pipe 12 slides and engages with the slide rail 132 on the side wall of the connector 13. The drive motor 14 inside the protective cover 141 on the crossbeam 142 can drive the connector 13 to rotate around its own axis through the synchronous shaft 143, providing power for subsequent adjustment actions.

[0033] As adsorption proceeds, the powder height gradually decreases. To prevent the suction height from decreasing with changes in the powder level and affecting the conveying efficiency, it is necessary to adjust the device structure to maintain a consistent material suction height. The rotation of the connector 13 will synchronously drive the sleeve 2 to move. The sleeve 2, through the sliding engagement between the slider 214 on the inner side wall and the through groove 215 on the side wall of the connector 13, and the guiding and limiting of the slider 214 by the guide rod 216, allows the threaded sleeve 21 at the end of the sleeve 2 to engage with the threaded groove 211 on the connecting pipe 12 when the sleeve 2 rotates with the connector 13, thereby driving the sleeve 2 to move axially along the connecting pipe 12.

[0034] The connecting cover 22, which is connected to the inner wall of the sleeve 2 via the connecting bracket 221, moves synchronously with the sleeve 2. The extension tube 222 on the connecting cover 22 extends axially along the suction hole 131. At the same time, the piston 223 on the outer wall of the extension tube 222 slides and engages with the inner wall of the suction hole 131 to ensure the sealing performance of the extension tube 222 during its extension and prevent negative pressure leakage. The compression spring 217 inside the through groove 215 engages with the side wall of the through groove 215 at one end and with the side wall of the slider 214 at the other end, which can buffer the movement of the sleeve 2 and prevent the extension tube 222 from extending too quickly and causing a collision when it comes into contact with the material. Meanwhile, the notch 213 on the end cover plate 212 of the sleeve 2 corresponds to the extension tube 222 to prevent the cover plate 212 from interfering with the movement of the extension tube 222. Ultimately, the extension length of the extension tube 222 is adjusted to ensure that the material suction height is maintained at the same level.

[0035] As the adsorption process progresses, the amount of fine powder easily adsorbed in the material gradually decreases. The remaining large particles and agglomerated materials, due to their greater mass, are no longer stably adsorbed by the original suction force. Furthermore, as the connecting cover 22 rotates, the synchronization plate 24 on the sealing plate 23 slides on the guide post 25. Finally, the ball bearing 253 at the end of the top block 252 on the synchronization plate 24 slides along the slope 251 of the side wall of the guide post 25, thereby pushing the synchronization plate 24 to move axially along the limiting rod 241 (one end of the limiting rod 241 is connected to the connecting cover 22, and the other end passes through the limiting plate 242). (Limiting the displacement range of the synchronization plate 24); the movement of the synchronization plate 24 will cause the sealing plate 23 connected to it to slide along the through hole 231 on the connecting cover 22. The fixing plate 236 on the side wall of the sealing plate 23 will drive the insertion rod 235 to move synchronously. The baffle 237 at one end of the insertion rod 235 will slide along the inner side wall of the positioning cover 232 and compress the limiting spring 238 (the positioning cover 232 is connected to the connecting cover 22 through the mounting plate 233, and the reinforcing rib 234 improves the stability of the positioning cover 232). The elastic force of the limiting spring 238 can ensure the stability of the position of the sealing plate 23 after it moves.

[0036] When the sealing plate 23 moves to the position corresponding to the extension tube 222, it will seal the three non-adjacent extension tubes 222, reducing the number of suction holes 131 actually working in the device. According to the principle of fluid mechanics, under the condition that the negative pressure power of the vacuum pump remains unchanged, the reduction in the number of suction holes 131 will increase the suction force of a single suction hole 131, thereby meeting the adsorption requirements for large particles and agglomerated materials in the later stage of adsorption. After the adsorption process is completed, the drive motor 14 reverses and drives the connector 13 to rotate in the opposite direction. The guide column 25 rotates in the opposite direction synchronously. The limit spring 238 resets and pushes the baffle 237, the insertion rod 235 and the sealing plate 23 to move in the opposite direction, releasing the seal on the extension tube 222. At the same time, the threaded sleeve 21 and the threaded groove 211 engage in the opposite direction, driving the sleeve 2 to reset. The extension tube 222 retracts into the suction hole 131, and the device returns to its initial state, completing a complete powder material adsorption and conveying cycle.

Claims

1. An automatic pneumatic pipeline conveying device for powdered materials, comprising a negative pressure pipe (1) connected to the input end of a vacuum pump, characterized in that: The negative pressure pipe (1) outlet is equipped with a connecting pipe (12), the end of the connecting pipe (12) is equipped with a connector (13), and the connector (13) is provided with six suction holes (131). The connector (13) is equipped with a drive motor (14), which is used to drive the connector (13) on the connector (13) to change the angle. The connecting pipe (12) is equipped with a sleeve (2) that rotates synchronously with the connector (13), and the sleeve (2) is engaged with the threaded groove (211) on the connecting pipe (12). The sleeve (2) is equipped with a connecting cover (22) corresponding to the suction hole (131), and an extension tube (222) is inserted into the connecting cover (22). The extension tube (222) is inserted into the corresponding suction hole (131). The connector (13) rotates to drive the sleeve (2) to rotate on the threaded groove (211), and drives the extension tube (222) to extend out from the suction hole (131) to ensure that the suction height is maintained at the same height. A sealing plate (23) is inserted into three non-adjacent connecting covers (22). A synchronization plate (24) is installed at one end of the sealing plate (23). A guide post (25) is installed on the connector (13). A ramp (251) is provided on the guide post (25). The synchronization plate (24) is slidably connected to the guide post (25). The ramp (251) is used to drive the sealing plate (23) to move and seal the corresponding extension tube (222). The suction force is increased by reducing the number of suction holes (131), thereby adapting to the adsorption of large particles and agglomerated materials in the later stage.

2. The automatic pneumatic pipeline conveying device for powdered materials according to claim 1, characterized in that, One end of the negative pressure pipe (1) is equipped with a connecting flange (11). The connecting flange (11) has several pairs of mounting holes (111). Bolts are inserted into the several pairs of mounting holes (111), and the mounting holes (111) facilitate the connection between the connecting flange (11) and the vacuum pump input end.

3. The automatic pneumatic pipeline conveying device for powdered materials according to claim 1, characterized in that, The connector (13) has a slide rail (132) on its side wall and a slide groove (133) at the end of the connecting pipe (12). The slide rail (132) is slidably disposed inside the slide groove (133). A crossbeam (142) is installed on the inner side wall of the connecting pipe (12). A protective cover (141) is installed on the crossbeam (142), and a drive motor (14) is installed inside the protective cover (141). A synchronous shaft (143) is installed at the output end of the drive motor (14), and the end of the synchronous shaft (143) is connected to the center of the connector (13).

4. The automatic pneumatic pipeline conveying device for powdered materials according to claim 1, characterized in that, The sleeve (2) is fitted with a threaded sleeve (21) at its end. The inner diameter of the threaded sleeve (21) is larger than that of the sleeve (2) to ensure that the sleeve (2) does not interfere with the threaded groove (211). The threaded sleeve (21) and the threaded groove (211) are engaged.

5. The automatic pneumatic pipeline conveying device for powdered materials according to claim 1, characterized in that, A slider (214) is installed on the inner wall of the sleeve (2). A through groove (215) is opened on the side wall of the connector (13). The slider (214) is slidably disposed inside the through groove (215). A guide rod (216) is installed through the through groove (215). The guide rod (216) and the slider (214) are movably connected. A compression spring (217) is sleeved on the guide rod (216). One end of the compression spring (217) is engaged with the side wall of the through groove (215), and the other end of the compression spring (217) is engaged with the side wall of the slider (214).

6. The automatic pneumatic pipeline conveying device for powdered materials according to claim 1, characterized in that, The connecting cover (22) has a connecting frame (221) on its side wall. The connecting frame (221) is connected to the inner side wall of the sleeve (2). The end of the sleeve (2) is fitted with a cover plate (212) by bolts. The cover plate (212) has several pairs of notches (213) on it. The several pairs of notches (213) correspond to the corresponding extension tubes (222).

7. The automatic pneumatic pipeline conveying device for powdered materials according to claim 1, characterized in that, A piston (223) is installed on the outer wall of the extension tube (222), and the end of the piston (223) is slidably connected to the inner wall of the suction hole (131).

8. The automatic pneumatic pipeline conveying device for powdered materials according to claim 1, characterized in that, The connecting cover (22) has a through hole (231). The sealing plate (23) is slidably disposed on the side wall of the through hole (231). A fixing plate (236) is installed on the side wall of the sealing plate (23). A plug rod (235) is installed on the fixing plate (236). A positioning cover (232) is inserted into the side wall of the plug rod (235). An mounting plate (233) is installed on the positioning cover (232), and the mounting plate (233) is connected to the side wall of the connecting cover (22). Next, a reinforcing rib (234) is installed between the mounting plate (233) and the positioning cover (232). A baffle (237) is slidably provided on the inner side wall of the positioning cover (232). One end of the baffle (237) is connected to the insertion rod (235). A limiting spring (238) is installed between the other end of the baffle (237) and the side wall of the positioning cover (232). The compression direction of the limiting spring (238) and the movement direction of the insertion rod (235) are on the same straight line.

9. The automatic pneumatic pipeline conveying device for powdered materials according to claim 1, characterized in that, A limiting rod (241) is movably installed through the synchronous plate (24). One end of the limiting rod (241) is installed on the side wall of the connecting cover (22), and the other end of the limiting rod (241) is installed with a limiting plate (242). The diameter of the limiting plate (242) is larger than the diameter of the limiting rod (241).

10. The automatic pneumatic pipeline conveying device for powdered materials according to claim 1, characterized in that, The connector (13) has a countersunk groove (254) and a guide post (25) is installed on the countersunk groove (254). The diameter of the guide post (25) near the inside of the countersunk groove (254) is smaller than the diameter of the outside. The synchronous plate (24) has a top block (252) installed on it. A ball (253) is installed at the end of the top block (252) and the ball (253) is slidably connected to the side wall of the guide post (25).

Images