Pulse elimination device arranged on a coating machine spray pipe

Abstract

The application discloses a pulse elimination device arranged on a spraying pipeline of a coating machine, which comprises a pulse elimination device body, wherein the feeding end of the pulse elimination device body is connected with a peristaltic pump, the discharging end of the pulse elimination device body is connected with an atomizing spray gun, the pulse elimination device body comprises a seat body, the lower end of the seat body is the feeding end, the upper end of the seat body is the discharging end, a liquid conveying channel for connecting the feeding end and the discharging end is arranged in the seat body, a pulse suppression sleeve is arranged in the liquid conveying channel, the pulse suppression sleeve has a tapered inner cavity which is narrow at the upper end and wide at the lower end and axially penetrates the liquid conveying channel, a plurality of stop blocks are circumferentially arranged on the pulse suppression sleeve, the lower end of each stop block is hingedly arranged on the pulse suppression sleeve, and the upper end of each stop block can be inwardly folded or outwardly opened through hinged rotation, and the application can be correspondingly adjusted in structure according to the different pulse sizes in the slurry, so that the elimination effect on the pulse is effectively improved.

Description

Technical Field

[0001] This invention relates to the field of coating machine technology, and more specifically to a pulse elimination device installed on the spray pipe of a coating machine. Background Technology

[0002] Currently, the spraying system of existing coating machines typically includes a peristaltic pump and an atomizing spray gun. The pump head of the peristaltic pump is generally a roller type, and the spraying pipe between the peristaltic pump and the atomizing spray gun is usually a silicone tube. The roller squeezes the silicone tube, and the continuous rotation of the roller creates suction, drawing the slurry from the slurry preparation system and ultimately injecting it into the spray gun. The spray gun atomizes the slurry and sprays it onto the material surface to achieve the coating of tablets. However, due to the gap between the rollers of the peristaltic pump head, a certain pulsation phenomenon occurs, especially noticeable at lower pump speeds. Depending on different production processes, different spraying volumes are required, resulting in varying pulsation magnitudes. To achieve uniform atomization by the spray gun, pulsation elimination is necessary. Existing technologies have some devices for pulsation elimination, but these devices have fixed structures and cannot be adjusted according to the different pulsation magnitudes in the slurry. Therefore, the pulsation elimination effect is not ideal, and there is room for improvement. Summary of the Invention

[0003] To address the shortcomings of existing technologies, this invention provides a pulse elimination device installed on the spraying pipe of a coating machine. This device can adjust its structure according to the different pulse sizes in the slurry, thereby effectively improving the pulse elimination effect.

[0004] To achieve the above objectives, the present invention provides a pulse elimination device installed on the spray pipe of a coating machine, comprising a pulse elimination device body, an inlet end of the pulse elimination device body connected to a peristaltic pump, and an outlet end of the pulse elimination device body connected to an atomizing spray gun. The pulse elimination device body includes a base, the lower end of which is the inlet end, and the upper end of which is the outlet end. A liquid delivery channel for connecting the inlet end and the outlet end is correspondingly provided inside the base. A pulse suppression sleeve is installed inside the liquid delivery channel, the pulse suppression sleeve being narrower at the top and wider at the bottom and corresponding to the... The infusion channel has an axially connected conical inner cavity. Multiple stops are circumferentially distributed on the pulse suppression sleeve. The lower end of each stop is hinged to the pulse suppression sleeve. The upper end of each stop can be closed inward or opened outward by hinged rotation. When the upper ends of each stop are closed inward, they form a stop block inner cavity that is axially joined with the conical inner cavity. The stop block inner cavity is also a conical structure that is narrow at the top and wide at the bottom and is located axially above the conical inner cavity. A first spring is provided between each stop and the pulse suppression sleeve to make the upper end of the stop close inward.

[0005] The present invention can be further configured such that the pulse suppression sleeve is provided with a plurality of radially movable sliders, and a linkage structure is provided between the sliders and the stop block. When the stop block is hinged and rotated inward to close, the linkage structure drives the slider to slide radially outward; when the stop block is hinged and rotated outward to open, the linkage structure drives the slider to slide radially inward. A limiting part is provided at the radially outer end of the slider, and a second spring is provided between the radially inner end of the slider and the pulse suppression sleeve to cause the limiting part to extend out of the pulse suppression sleeve. A limiting strip is correspondingly provided in the infusion channel to form an axial abutment limiting fit with the limiting part when the limiting part extends out of the pulse suppression sleeve.

[0006] The beneficial effects of this invention are: under the action of the peristaltic pump, the slurry is transported to the atomizing spray gun through the spraying pipe. Since the invention has a pulse elimination device body on the spraying pipe, the pulse in the slurry can be eliminated. Specifically, when the slurry enters the delivery channel through the feed end of the seat, a pulse suppression sleeve is installed inside the delivery channel. This pulse suppression sleeve has a conical inner cavity that is narrow at the top and wide at the bottom and runs through the axial direction of the delivery channel. Therefore, when the pulse in the slurry is small, the conical inner cavity of the pulse suppression sleeve can eliminate the pulse. When the pulse increases, multiple baffles are circumferentially distributed on the pulse suppression sleeve. The lower end of each baffle is hinged to the pulse suppression sleeve, and the upper end of each baffle can be closed inward or opened outward by hinged rotation. When the upper ends of each baffle are closed inward, they form a baffle inner cavity that axially aligns with the conical inner cavity. The baffle inner cavity is also a conical structure that is narrow at the top and wide at the bottom and is located axially above the conical inner cavity. Therefore, the baffle can be pushed to open outward by hinged rotation, thereby expanding the flow area of ​​the slurry and eliminating the pulse in the process. Furthermore, when the pulse is particularly large, the stop block, by hinged rotation and outward opening, can also drive the slider to slide radially inward, thereby causing the limiting part on the slider to retract inward and lose its limiting engagement with the limiting strip. This releases the position lock of the pulse suppression sleeve, allowing it to float upward under the scouring of the slurry and pulses, thus better eliminating the pulses in the slurry. After completion, the stop block closes inward under the action of the first spring, simultaneously pushing the limiting part on the slider outward. Under the action of the second spring, the limiting part on the slider can be further propelled outward. Thus, when the pulse suppression sleeve falls back to its original position, the limiting engagement of the limiting part on the slider with the limiting strip achieves position locking of the pulse suppression sleeve. In summary, because the pulse elimination structure provided by this invention can adjust its structure according to the different pulse sizes in the slurry, it has a better pulse elimination effect than the prior art. Moreover, the structure is simple, and the entire process is automatically adjusted without manual control.

[0007] The invention can be further configured such that an annular groove with a cross-section of the number 7 is provided in the infusion channel, and one end of a limiting strip is hinged to the included angle of the number 7 annular groove. A third spring is connected to the limiting strip to cause its other end to abut against the transverse end of the number 7 annular groove. When the other end of the limiting strip abuts against the transverse end of the number 7 annular groove, the limiting part on the slider and the limiting strip form an axial abutment limiting engagement. With this configuration, under normal circumstances, under the action of the third spring, the limiting strip abuts against the transverse end of the number 7 annular groove, and the limiting part on the slider abuts against the limiting strip, thereby enabling the slider and the limiting strip to form a limiting abutment engagement to achieve position locking of the pulse suppression sleeve. When the slider moves radially inward, the limiting part on the slider loses its abutment engagement with the limiting strip, thereby releasing the position locking of the pulse suppression sleeve. At this time, the pulse suppression sleeve can float up under the flushing of the slurry and pulse. After the scouring force subsides, the pulse suppression sleeve automatically falls back under the action of gravity. At this time, the limiting part on the slider will extend again. After the pulse suppression sleeve falls back to its original position, the limiting part on the slider will once again form an abutment limit with the limiting strip to lock the position of the pulse suppression sleeve again.

[0008] The present invention can be further configured such that the linkage structure includes a linkage gear, which is mounted on a hinge shaft that is hinged to the stop block and the pulse suppression sleeve, and the linkage gear and the stop block form a fixed fit. A rack is correspondingly provided on the slider to mesh with the linkage gear. With this configuration, the hinged rotation of the stop block drives the linkage gear to rotate, and the rack, in turn, drives the slider to slide. Of course, the linkage structure can also be implemented using a suitable transmission structure such as a worm gear, ratchet, or pawl.

[0009] The invention can be further configured such that an elastic washer is provided on the feed end of the seat, and the pulse suppression sleeve abuts against the elastic washer axially. The elastic washer has a double-layer structure, with the outer radial end of the upper layer of the elastic washer curving upwards and forming an arc surface on the upper end face of the elastic washer. The pulse suppression sleeve is correspondingly provided with an arc angle that abuts against the arc surface. The slider is provided with an extension foot that extends downwards and protrudes beyond the pulse suppression sleeve. The lower end of the extension foot is correspondingly formed with an arc portion that abuts axially against the arc surface. The inner radial end of the elastic washer is correspondingly formed with a compressible portion that abuts radially against the extension foot. By adopting the above scheme and providing the elastic washer, a buffer protection function can be provided for the pulse suppression sleeve when it falls back. Meanwhile, because the upper radial outer end of the elastic washer curves upward, forming an arc surface on its upper end face, and the pulse suppression sleeve is correspondingly provided with an arc angle that abuts against the arc surface, and the slider is provided with an extension foot extending downward and protruding outside the pulse suppression sleeve, the lower end of the extension foot correspondingly forms an arc portion that abuts against the arc surface, thus, through the above-mentioned arc surface cooperation, the pulse suppression sleeve can achieve centering after falling back and after swinging left and right under the action of scouring. Furthermore, the elastic washer has a double-layer structure, and its upper end face forms an arc surface that is higher on the outside and lower on the inside. This not only greatly improves the buffering and protection effect but also provides a larger deformation space. In addition, this design also helps the pulse suppression sleeve to swing left and right when subjected to scouring and to automatically center itself after swinging, thereby better eliminating pulses.

[0010] The invention can be further configured such that the slider has a guide protrusion, and the pulse suppression sleeve has a corresponding guide groove that radially slides with the guide protrusion. The cooperation between the guide protrusion and the guide groove makes the radial sliding of the slider more stable and reliable.

[0011] The present invention can be further configured such that the infusion channel includes a main channel and multiple branch channels. The main channel is vertically arranged and axially communicates with the inlet end. The pulse suppression sleeve is disposed inside the main channel and close to the inlet end. The lower end of each branch channel is connected to the main channel, and the upper end of each branch channel is connected to the outlet end. By adopting the above scheme, dividing the infusion channel into a main channel and multiple branch channels, further pulse reduction can be achieved.

[0012] The invention can be further configured such that each of the main channel and each branch channel is provided with a cleaning and flushing port, and each cleaning and flushing port is equipped with a plug cap. When cleaning is required, the cleaning and dredging operations of the main channel and each branch channel can be easily completed by opening the plug cap. Attached Figure Description

[0013] Figure 1 This is a structural diagram of the present invention;

[0014] Figure 2 This is a structural diagram of the pulse suppression sleeve portion in this invention;

[0015] Figure 3 for Figure 2 Enlarged view of part A. Detailed Implementation

[0016] like Figure 1 , 2 Figure 3 shows a pulse elimination device installed on the spraying pipe of a coating machine. The device includes a pulse elimination device body, with its inlet end connected to a peristaltic pump and its outlet end connected to an atomizing spray gun. The pulse elimination device body includes a base 1, with its lower end being the inlet end 11 and its upper end being the outlet end 12. A liquid delivery channel is correspondingly provided within the base 1 to connect the inlet end 11 and the outlet end 12. The liquid delivery channel includes a main channel 13 and multiple branch channels 14. The main channel 13 is vertically arranged and axially communicates with the inlet end 11. A pulse suppression sleeve 2 is disposed within the main channel 13 and close to the inlet end 11. The lower end of each branch channel 14 is connected to the main channel 13, and the upper end of each branch channel 14 is connected to the outlet end 12. A cleaning and flushing port is provided on the main channel 13 and each branch channel 14, and a plug cap 15 is installed on each cleaning and flushing port. When cleaning is required, the main channel 13 and each branch channel 14 can be easily cleaned and dredged by opening the plug cover 15.

[0017] The pulse suppression sleeve 2 has a conical inner cavity 21 that is narrow at the top and wide at the bottom and is axially connected to the main channel 13. Multiple stops 22 are arranged circumferentially on the pulse suppression sleeve 2. The lower end of each stop 22 is hinged to the pulse suppression sleeve 2. The upper end of each stop 22 can be closed inward or opened outward by hinged rotation. After the upper ends of each stop 22 are closed inward, they form a stop block inner cavity 23 that is axially matched with the conical inner cavity 21. The stop block inner cavity 23 is also a conical structure that is narrow at the top and wide at the bottom and is located axially above the conical inner cavity 21. A first spring 24 is provided between each stop 22 and the pulse suppression sleeve 2 to make the upper end of the stop 22 close inward.

[0018] The pulse suppression sleeve 2 is provided with a plurality of radially movable sliders 25. A linkage structure is provided between the sliders 25 and the stop block 22. When the stop block 22 is hinged and rotated inward, the linkage structure drives the sliders 25 to slide radially outward. When the stop block 22 is hinged and rotated outward, the linkage structure drives the sliders 25 to slide radially inward. A limiting part 251 is provided at the radial outer end of the sliders 25. A second spring 252 is provided between the radial inner end of the sliders 25 and the pulse suppression sleeve 2 to cause the limiting part 251 to extend out of the pulse suppression sleeve 2. A limiting strip 253 is correspondingly provided in the main channel 13 to form an axial abutment limiting cooperation with the limiting part 251 when the limiting part 251 extends out of the pulse suppression sleeve 2.

[0019] Under the action of the peristaltic pump, the slurry is transported to the atomizing spray gun through the spraying pipe. Since the present invention incorporates a pulse elimination device body on the spraying pipe, pulses in the slurry can be eliminated. Specifically, when the slurry enters the delivery channel through the feed end 11 of the base 1, a pulse suppression sleeve 2 is installed inside the delivery channel. The pulse suppression sleeve 2 has a conical inner cavity 21 that is narrow at the top and wide at the bottom and axially communicates with the main channel 13. Therefore, when the pulses in the slurry are small, the conical inner cavity 21 of the pulse suppression sleeve 2 can eliminate the pulses. However, when the pulses increase, multiple baffles 22 are circumferentially distributed on the pulse suppression sleeve 2, and the lower ends of each baffle 22 are hinged. Mounted on the pulse suppression sleeve 2, the upper ends of each stop block 22 can be hinged and rotated to close inward or open outward. When the upper ends of each stop block 22 are closed inward, they form a stop block cavity 23 that axially engages with the conical inner cavity 21. The stop block cavity 23 is also a conical structure that is narrower at the top and wider at the bottom and is located axially above the conical inner cavity 21. Therefore, it can push the stop blocks 22 to open outward through hinged rotation, thereby expanding the flow area of ​​the slurry and eliminating the pulse in the process. In addition, when the pulse is particularly large, when the stop blocks 22 open outward through hinged rotation, they can also drive the slider 25 to slide radially inward, thereby causing the limiting part 251 on the slider 25 to retract inward and lose its limiting engagement with the limiting strip 253. This releases the position lock of the pulse suppression sleeve 2, allowing the pulse suppression sleeve 2 to float upward under the flushing of the slurry and the pulse, so as to better eliminate the pulse in the slurry. After completion, the stop block 22 closes inward under the action of the first spring 24, simultaneously pushing the limiting part 251 on the slider 25 outward. Under the action of the second spring 252, the limiting part 251 on the slider 25 further extends outward. Thus, when the pulse suppression sleeve 2 returns to its original position, the limiting part 251 on the slider 25 engages with the limiting strip 253 to lock the position of the pulse suppression sleeve 2. In summary, because the pulse elimination structure provided by this invention can adjust its structure according to the different pulse sizes in the slurry, it has a better pulse elimination effect than the prior art. Furthermore, the structure is simple, and the entire process is automatically adjusted without manual control.

[0020] The main channel 13 is provided with an annular groove 16 with a cross-section of the number 7. One end of the limiting strip 253 is hinged to the included angle of the annular groove 16. A third spring is connected to the limiting strip 253 to cause its other end to abut against the transverse end 17 of the annular groove 16. When the other end of the limiting strip 253 abuts against the transverse end 17 of the annular groove 16, the limiting part 251 on the slider 25 and the limiting strip 253 form an axial abutment limiting engagement. With this configuration, under normal circumstances, under the action of the third spring, the limiting strip 253 abuts against the transverse end 17 of the annular groove 16, and the limiting part 251 on the slider 25 abuts against the limiting strip 253, thereby enabling the slider 25 and the limiting strip 253 to form a limiting abutment engagement to achieve position locking of the pulse suppression sleeve 2. When the slider 25 moves radially inward, the limiting part 251 on the slider 25 loses its contact with the limiting strip 253, thereby releasing the position lock of the pulse suppression sleeve 2. At this time, the pulse suppression sleeve 2 can float up under the scouring of the slurry and pulse. After the scouring force decreases, the pulse suppression sleeve 2 automatically falls back under the action of gravity. At this time, the limiting part 251 on the slider 25 will extend again. After the pulse suppression sleeve 2 falls back to its original position, the limiting part 251 on the slider 25 will once again form a contact limit with the limiting strip 253 to achieve position lock of the pulse suppression sleeve 2 again.

[0021] The linkage structure includes a linkage gear 26, which is mounted on a hinge shaft that hinges the stop block 22 to the pulse suppression sleeve 2. The linkage gear 26 and the stop block 22 are fixedly engaged. A rack 254 is correspondingly provided on the slider 25 to mesh with the linkage gear 26. With this configuration, the hinged rotation of the stop block 22 drives the linkage gear 26 to rotate, and the rack 254, in turn, drives the slider 25 to slide. Alternatively, the linkage structure can also be implemented using a worm gear, ratchet, or pawl transmission structure.

[0022] An elastic washer 3 is provided on the feed end of the seat 1. The pulse suppression sleeve 2 presses against the elastic washer 3 axially. The elastic washer 3 has a double-layer structure. The outer radial end 33 of the upper layer of the elastic washer 3 is raised upward, forming an arc surface 31 on the upper end face of the elastic washer 3. The pulse suppression sleeve 2 is provided with an arc angle 27 that abuts against the arc surface 31. The slider 25 is provided with an extension foot 255 that extends downward and passes through the pulse suppression sleeve 2. The lower end of the extension foot 255 forms an arc portion 256 that abuts axially against the arc surface 31. The inner radial end of the elastic washer 3 forms a compressible portion 32 that abuts radially against the extension foot 255. By using the above scheme, the elastic washer 3 can provide buffer protection when the pulse suppression sleeve 2 falls back. Meanwhile, because the upper radial outer end 33 of the elastic washer 3 curves upward, forming an arc surface 31 on the upper end face of the elastic washer 3, and the pulse suppression sleeve 2 is correspondingly provided with an arc angle 27 that abuts against the arc surface 31, and the slider 25 is provided with an extension foot 255 that extends downward and passes through the pulse suppression sleeve 2, the lower end of the extension foot 255 correspondingly forms an arc portion 256 that abuts against the arc surface 31, thus, through the above-mentioned arc surface cooperation, the pulse suppression sleeve 2 can achieve centering after falling back and after swinging left and right under the action of scouring. At the same time, the elastic washer 3 has a double-layer structure, and its upper end face forms an arc surface 31 that is higher on the outside and lower on the inside. This not only greatly improves the buffer protection effect, but also provides a larger deformation space. In addition, this setting also helps the pulse suppression sleeve 2 to swing left and right when subjected to scouring, and to automatically center itself after swinging, thereby better eliminating pulses.

[0023] The slider 25 is provided with a guide protrusion 257, and the pulse suppression sleeve 2 is provided with a guide groove 258 that forms a radial sliding fit with the guide protrusion 257. Through the cooperation of the guide protrusion 257 and the guide groove 258, the radial sliding of the slider 25 is made more stable and reliable.

Claims

1. A pulse elimination device installed on the spray pipe of a coating machine, comprising a pulse elimination device body, the inlet end of the pulse elimination device body being connected to a peristaltic pump, and the outlet end of the pulse elimination device body being connected to an atomizing spray gun, characterized in that: The pulse elimination device includes a base, with the lower end of the base being the feed end and the upper end being the discharge end. A liquid infusion channel is correspondingly provided within the base to connect the feed end and the discharge end. A pulse suppression sleeve is installed within the liquid infusion channel. The pulse suppression sleeve has a conical inner cavity that is narrower at the top and wider at the bottom and axially communicates with the liquid infusion channel. Multiple stops are circumferentially distributed on the pulse suppression sleeve. The lower ends of each stop are hinged to the pulse suppression sleeve. The upper ends of each stop can be hinged and rotated inwards or outwards. When the upper ends of each stop are closed inwards, they form a stop block inner cavity that axially aligns with the conical inner cavity. The stop block inner cavity is also a conical structure that is narrower at the top and wider at the bottom and is located axially above the conical inner cavity. A first spring is provided between each stop and the pulse suppression sleeve to force the upper ends of the stop to close inwards. The pulse suppression sleeve is provided with multiple radially movable sliders. A linkage structure is provided between the sliders and the stop block. When the stop block is hinged and rotated inward to close, the linkage structure drives the slider to slide radially outward. When the stop block is hinged and rotated outward to open, the linkage structure drives the slider to slide radially inward. A limiting part is provided at the radially outer end of the slider. A second spring is provided between the radially inner end of the slider and the pulse suppression sleeve to cause the limiting part to extend out of the pulse suppression sleeve. A limiting strip is correspondingly provided in the infusion channel to form an axial abutment limiting fit with the limiting part when the limiting part extends out of the pulse suppression sleeve. The infusion channel is provided with an annular groove with a cross-section of the number 7. One end of the limiting strip is hinged to the included angle of the number 7 annular groove. A third spring is connected to the limiting strip to make its other end abut against the transverse end of the number 7 annular groove. When the other end of the limiting strip abuts against the transverse end of the number 7 annular groove, the limiting part on the slider and the limiting strip form an axial abutment limiting fit. The linkage structure includes a linkage gear, which is mounted on a hinge shaft that is hinged to the stop block and the pulse suppression sleeve. The linkage gear and the stop block are fixedly engaged, and a rack is correspondingly provided on the slider to mesh with the linkage gear.

2. The pulse elimination device installed on the spray pipe of the coating machine according to claim 1, characterized in that: An elastic washer is provided on the feed end of the seat. The pulse suppression sleeve presses against the elastic washer axially. The elastic washer has a double-layer structure. The outer radial end of the upper layer of the elastic washer is raised upward, and the upper end face of the elastic washer forms an arc surface. The pulse suppression sleeve is provided with an arc angle that abuts against the arc surface. The slider is provided with an extension foot that extends downward and passes through the pulse suppression sleeve. The lower end of the extension foot forms an arc portion that abuts axially against the arc surface. The inner radial end of the elastic washer forms a compressible portion that abuts radially against the extension foot.

3. The pulse elimination device installed on the spray pipe of the coating machine according to claim 1, characterized in that: The slider is provided with a guide protrusion, and the pulse suppression sleeve is provided with a guide groove that forms a radial sliding fit with the guide protrusion.

4. The pulse elimination device installed on the spraying pipe of the coating machine according to claim 1, characterized in that: The infusion channel includes a main channel and multiple branch channels. The main channel is vertically arranged and axially connected to the feed end. The pulse suppression sleeve is arranged inside the main channel and close to the feed end. The lower end of each branch channel is connected to the main channel, and the upper end of each branch channel is connected to the discharge end.

5. The pulse elimination device installed on the spray pipe of the coating machine according to claim 4, characterized in that: The main channel and each branch channel are equipped with a cleaning and flushing port, and each cleaning and flushing port is fitted with a plug cover.

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