Novel annular automatic coating tool and coating agent channel and coating method thereof

Abstract

The invention relates to the field of propellant grain coating process equipment, and discloses a novel annular automatic coating tool and a coating agent channel and a coating method.The novel annular automatic coating tool comprises a horizontally-arranged fixed jig, a movable jig and a driving device for driving the movable jig to move, and an inner mounting hole is formed in the fixed jig; a fixed positioning block is arranged in the mounting inner hole, the movable jig is pushed by the driving device to extend into the mounting inner hole, the movable jig and the fixed positioning block form a discharging channel for the coating agent to flow out, and the discharging channel is communicated with a feeding port of the fixed jig; the propellant grain penetrates through the middle of the discharging channel and is in coaxial clearance fit with the discharging channel, and when the coating tool moves, the coating agent flows out of the discharging channel and evenly coats the surface of the propellant grain. The device has the beneficial effects that bubbles are prevented from occurring in a coating agent, the discharging uniformity is good, the thickness of a coating layer can be adaptively adjusted, the formed coating layer is good in consistency, uniformity and quality, the participation degree of personnel in the coating process is greatly reduced, and the labor cost is reduced.

Description

Technical Field

[0001] The invention relates to the field of propellant grain coating process equipment, and in particular to a novel annular automatic coating tool and a coating agent channel and a coating method thereof. Background Art

[0002] Propellant grain surface coating is a commonly used process for controlling the combustion of propellant grains and coating engines. Currently, most coating processes are carried out manually. Due to differences in personnel status and experience as well as the influence of environmental factors, manual coating may cause coating quality problems such as uneven coating surface, large thickness deviation, and large coating quality deviation of the same batch of products. At the same time, manual coating requires a lot of labor, and some coating agents contain volatile solvents that are harmful to the human body. Long-term inhalation of volatile solvents through the respiratory tract and skin contact with coating agents will have a certain impact on human health.

[0003] However, the existing automatic coating equipment cannot adapt to different types of propellant grains. When different propellant grains are replaced, the entire tooling can only be replaced, such as the invention patent application with application number 202311769956.3, a new type of nitro paint automatic coating equipment and process, a new type of nitro paint automatic coating equipment, including a frame, a control cabinet and a control panel electrically connected to the control cabinet, and also including a feeding device, a coating device, a collecting device and a discharging device which are sequentially arranged on the frame and electrically connected to the control cabinet. The collecting device moves the propellant grain from the feeding device, the coating device and the discharging device in sequence, and a first power device is provided on the frame to drive the collecting device to move between the coating device and the discharging device, and a second power device is provided on the frame to position the propellant grain on the coating device, and the first power device and the second power device are both electrically connected to the control cabinet.

[0004] This invention application realizes automatic loading and unloading and automatic coating of propellant grains through coating equipment, and realizes human-machine isolation in the coating process. The coating process is to extrude the nitrocellulose lacquer coating agent from the coating tooling outlet to the circumferential surface of the propellant grain, and the servo motor drives the coating tooling to move from one end of the propellant grain to the other end, thereby completing the coating of the entire propellant grain. The structure of the discharge port cannot be changed to adapt to different types of propellant grains, and bubbles may exist in the coating agent pushed out from the discharge port, affecting the appearance quality of the coating layer, and the extrusion speed and amount of the coating agent cannot be controlled, affecting the uniformity of the coating layer on the surface of the propellant grain. Summary of the invention

[0005] In order to overcome the problems of coating quality such as uneven coating layer surface, large thickness deviation, large coating quality deviation of the same batch of products in the manual coating in the above-mentioned background technology, as well as the inability of existing automatic coating equipment to adaptably coat different types of propellant grains, the presence of bubbles in the coating agent pushed out from the automatic coating equipment and the uniformity of the coating layer on the surface of the propellant grain being affected, the present invention provides a novel annular automatic coating tool and its coating agent channel and coating method. The coating tool can realize automatic coating of propellant grains with various liquid coating agents, and has the advantages of being able to adaptively adjust the size of the discharge port, control the discharge amount of the coating agent, avoid the appearance of bubbles in the coating agent, affect the appearance quality of the coating layer, have good discharge uniformity, and the coating layer thickness can be adaptively adjusted. The formed coating layer has good consistency, uniformity and quality, which greatly reduces the participation of personnel in the coating process and has the beneficial effect of reducing labor costs.

[0006] The technical solution of the present invention is as follows:

[0007] A novel annular automatic coating tool comprises a horizontally arranged fixed fixture, a movable fixture and a driving device for driving the movable fixture to move. The fixed fixture is provided with an installation inner hole, and a fixed positioning block is arranged in the installation inner hole. The movable fixture is pushed by the driving device to extend into the installation inner hole and form a discharge channel for the coating agent to flow out with the fixed positioning block. The discharge channel is communicated with the feed port of the fixed fixture; the propellant grain passes through the middle of the discharge channel and is coaxially gapped with the discharge channel. When the coating tool moves, the coating agent flows out from the discharge channel and is uniformly coated on the surface of the propellant grain.

[0008] Compared with the prior art, the beneficial effects of this technical solution are:

[0009] (1) By using the automatic coating tool provided in this embodiment, the propellant grain can be extended into the middle of the discharge port of the discharge channel. When the coating tool moves, the coating agent flows into the fixed fixture from the feed port, and flows out from the discharge port of the discharge channel to evenly coat the surface of the propellant grain to form a coating layer, thereby solving the coating quality problems in the background technology such as uneven coating layer surface, large thickness deviation, and large coating quality deviation of the same batch of products when coating is performed manually;

[0010] (2) Since the propellant grain passes through the discharge channel and is coaxially matched with the discharge channel, the coating agent can be evenly covered on the surface of the propellant grain when the coating tool moves, avoiding the situation where the coating layer has different thicknesses;

[0011] (3) Since the distance that the movable fixture extends into the mounting inner hole can be controlled by the driving device, the size of the discharge channel can be adjusted, thereby controlling the discharge amount of the coating agent flowing out of the discharge port, controlling the thickness of the coating layer, and effectively ensuring the uniformity of the coating layer thickness. Compared with manual coating, the uniformity of the coating layer thickness is significantly improved, avoiding the problem in the background technology that the extrusion speed and extrusion amount of the coating agent cannot be controlled, which affects the uniform coverage of the surface of the propellant grain by the coating agent. In addition, the coating agent is discharged through the discharge port of the annular structure, and the discharge uniformity is higher.

[0012] Preferably, the driving device includes a driving cylinder, which is arranged on the same side of the fixed jig as the driving cylinder and the movable jig, and the driving cylinder controls the sliding plate to move back and forth on the fixed slide rail, and the fixed slide rail is parallel to the moving direction of the movable jig; the side surface of the sliding plate is vertically fixedly connected to one end of the connecting arm, and the other end of the connecting arm is fixedly connected to the movable jig.

[0013] Further preferably, a horizontally arranged limiting rod is fixed to one side of the connecting arm close to the driving cylinder, and the movable end of the limiting rod can abut against the positioning plate surface of the driving cylinder to control the maximum distance that the movable fixture can move outward.

[0014] Further preferably, the upper part of the fixed jig, the fixed slide rail and the driving cylinder are fixed on the coating jig connecting plate in sequence, the coating jig connecting plate is connected to the servo drive slide group, and the servo drive slide group drives the coating tooling to move at a uniform speed through the coating jig connecting plate to uniformly coat the surface of the propellant grain.

[0015] Based on the above technical solution, the present application also provides a new type of annular automatic coating tooling coating agent channel, the outer ring block and the inner ring block are detachably connected to both sides of the fixed fixture, and both extend into the installation inner hole to form a coating agent channel through which the coating agent flows, and the coating agent channel connects the feed port and the discharge channel.

[0016] Preferably, the outer side surfaces of the outer ring block and the inner ring block are fixedly connected to the two sides of the fixed fixture by means of threaded connection, and both are matched with the inner wall of the mounting inner hole with zero clearance; the movable fixture extends into the inner ring block and is matched and connected therewith.

[0017] Preferably, the fixed positioning block is clamped in the annular groove provided on the inner end face of the outer ring block, and a movable positioning block is clamped in the annular groove on one end face of the movable fixture close to the fixed positioning block, and the opposite surfaces of the movable positioning block and the fixed positioning block are the discharge channel; the coating agent channel and the discharge channel gradually narrow along the flow direction of the coating agent; the size of the discharge channel can be changed by adjusting the position of the movable positioning block, and when the movable positioning block is connected to the fixed positioning block, the discharge channel is closed.

[0018] Further preferably, the inner ring surfaces of the fixed positioning block and the movable positioning block are flush, the inner ring diameters of the two are matched with the diameter of the propellant grain, and the spacing distance between the inner ring surfaces of the two and the surface of the propellant grain is in the range of 1-2mm; the inner ring diameters of the outer ring block and the movable fixture are both larger than the inner ring diameters of the fixed positioning block and the movable positioning block.

[0019] Preferably, the fixed fixture is provided with four feed ports, which are evenly arranged at the four corners of the lower part of the fixed fixture; an annular channel is provided on the outer ring surface of the inner ring block, and the annular channel is communicated with the feed port of the fixed fixture through the feed channel in the fixed fixture, and a plurality of partial pressure mixing holes are opened on the side wall close to the coating agent channel, and the partial pressure mixing holes are evenly arranged along the circumference of the side wall on this side and communicated with the coating agent channel, and the diameter of the partial pressure mixing holes is 4 mm.

[0020] The beneficial effects of the above technical solution are:

[0021] (1) By arranging the outer ring block and the inner ring block to form the coating agent channel, it is easier to adjust the structure and shape of the coating agent channel, and the outer ring block and the inner ring block are detachably connected to the fixed fixture, which is also easier to disassemble the outer ring block and the inner ring block, and timely inspect the inside of the fixed fixture;

[0022] (2) The discharge channel is composed of two detachable movable positioning blocks and a fixed positioning block, and the corresponding movable positioning blocks and fixed positioning blocks can be quickly replaced according to the outer diameter of the propellant grain, which has higher adaptability and solves the problem that the existing automatic coating equipment in the background technology cannot adapt to different types of propellant grains;

[0023] (3) The coating agent channel and the discharge channel gradually narrow along the flow direction of the coating agent, which can effectively control the extrusion speed and amount of the coating agent, and play a certain buffering role, ensuring the uniformity of the coating agent discharge from the annular discharge port of the entire discharge channel;

[0024] (4) When the opposite surfaces of the movable positioning block and the fixed positioning block are connected close to one end of the inner ring side, the discharge port of the discharge channel is closed, which effectively prevents the volatilization of the solvent in the coating agent, thereby preventing the coating agent channel pipeline from being blocked, reducing the failure rate of the coating tooling, and ensuring the continuity of the production process.

[0025] (5) By opening pressure-dividing mixing holes uniformly arranged along the circumferential direction of the side wall of the annular channel, the coating agent entering the annular channel from the feed channel can be uniformly diffused from the pressure-dividing mixing holes into the coating agent channel and fill the coating agent channel, and is uniformly extruded through the discharge port of the discharge channel. The coating agent extruded into the coating agent channel through the pressure-dividing mixing holes can squeeze out the bubbles contained in the coating agent, thereby improving the appearance quality of the coating layer. This solves the problem in the background technology that bubbles may exist in the coating agent pushed out from the discharge port of the existing automatic coating equipment, thereby affecting the appearance quality of the coating layer.

[0026] On the basis of the above technical solution, the present application also provides a novel wrapping method of annular automatic wrapping tool, comprising the following steps:

[0027] Step 1: According to the characteristics of the propellant grain, set the moving speed of the coating tooling and the extension distance of the output end of the driving cylinder;

[0028] Step 2: Start the driving cylinder, which pushes the movable fixture to the set position in the inner ring block, and injects the coating agent from the four feed ports of the fixed fixture;

[0029] Step 3: The coating agent enters the annular channel from the four feed ports of the fixed fixture through the feed channel, and is evenly diffused from the partial pressure mixing holes of the annular channel to the coating agent channel, and flows into the discharge channel along the coating agent channel, and is evenly extruded through the discharge port of the discharge channel;

[0030] Step 4: Put the propellant grain into the middle of the discharge channel, with the head of the propellant grain facing the discharge port of the discharge channel, start the servo drive slide group, and the servo drive slide group drives the coating tooling to move at a uniform speed along the coating direction through the coating fixture connection plate. During the movement, the coating agent extruded through the discharge port of the discharge channel is evenly coated on the surface of the propellant grain to form a coating layer;

[0031] Step 5: When the coating tool moves from the head to the tail of the propellant column, the driving device continues to push the movable fixture to move into the fixed fixture, so that the movable positioning block is connected with the fixed positioning block, the discharge channel is closed, and the coating agent is blocked from continuing to discharge, thus completing the coating.

[0032] The beneficial effects of this technical solution are:

[0033] By coating the propellant grains using the coating method of the coating tooling, it is possible to achieve automatic coating of the propellant grains with a variety of liquid coating agents, greatly improving the appearance quality, coating quality and consistency of the coating layer of the propellant grains, reducing the thickness deviation of the coating layer of the propellant grains, and reducing the degree of manual participation in the coating process. It can also be combined with automatic loading and unloading devices, manipulators and other equipment on the market to achieve automation of the entire coating process. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The present invention will be described with reference to the accompanying drawings, in which:

[0035] Figure 1 It is a schematic diagram of the overall three-dimensional structure of the present invention;

[0036] Figure 2 It is a front view of the discharging channel of the present invention when it is closed;

[0037] Figure 3 For the present invention Figure 2A schematic diagram of the local enlarged structure at point A in the middle;

[0038] Figure 4 is a cross-sectional view of a fixing fixture of the present invention;

[0039] Figure 5 It is a cross-sectional view of the movable fixture of the present invention;

[0040] Figure 6 It is a schematic diagram of the connection structure of the outer ring block and the inner ring block of the present invention.

[0041] Figure numerals: fixed fixture 1, mounting inner hole 11, fixed positioning block 12, feed port 13, feed channel 14, movable fixture 2, movable positioning block 21, driving cylinder 31, positioning plate 311, sliding plate 32, fixed slide rail 33, air pipe 34, connecting arm 35, connecting support wall 351, limiting rod 36, discharge channel 4, outer ring block 41, inner ring block 42, coating agent channel 43, annular channel 44, pressure dividing mixing hole 45, coating fixture connecting plate 5. DETAILED DESCRIPTION

[0042] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0043] Example 1: Figures 1 to 6 A new type of annular automatic coating tooling shown in the figure includes a horizontally arranged fixed fixture 1, a movable fixture 2 and a driving device for driving the movable fixture 2 to move. An installation inner hole 11 is opened in the fixed fixture 1, and a fixed positioning block 12 is arranged in the installation inner hole 11. The fixed positioning block 12 and the movable fixture 2 are both annular block structures. The movable fixture 2 extends into the installation inner hole 11 under the action of the driving device and cooperates with the inner wall gap of the fixed positioning block 12. The gap between the opposite surfaces of the two forms an annular structure discharge channel 4 for the coating agent to flow out, and the discharge port of the discharge channel 4 is also an annular structure, wherein the distance of the movable fixture 2 extending into the installation inner hole 11 can be controlled by the driving device, thereby adjusting the size of the discharge channel 4.

[0044] The discharge channel 4 is communicated with the feed port 13 of the fixed fixture 1, the coating agent flows into the fixed fixture 1 from the feed port 13, and flows out from the discharge port of the discharge channel 4, the propellant grain passes through the inner ring holes of the movable fixture 2 and the fixed positioning block 12 in sequence, and is located in the middle of the discharge channel 4 and is coaxially clearance-matched therewith, that is, the discharge port of the discharge channel 4 is annular in shape and matches the circumferential shape of the propellant grain, and leaves a gap with the outer peripheral surface of the propellant grain, and the vertical distances of different positions of the discharge port from the surface of the propellant grain are the same, and the propellant grain is mostly a cylindrical structure, so the discharge port can be set to a circular ring shape.

[0045] By using the automatic coating tool provided in this embodiment, the propellant grain can be extended into the middle of the discharge port of the discharge channel 4. When the coating tool moves, the coating agent flows into the fixed fixture 1 from the feed port 13, and flows out from the discharge port of the discharge channel 4 to evenly coat the surface of the propellant grain to form a coating layer, which solves the coating quality problems such as uneven coating layer surface, large thickness deviation, and large coating quality deviation of the same batch of products when coating is performed manually in the background technology; because the propellant grain passes through the discharge channel 4 and is coaxially spaced with it, when the coating tool moves, the coating agent can evenly cover the propellant grain surface, avoiding the situation where the thickness of the coating layer is different; since the distance that the movable fixture 2 extends into the installation inner hole 11 can be controlled by the driving device, the size of the discharge channel 4 can be adjusted, thereby controlling the discharge amount of the coating agent flowing out of the discharge port, controlling the thickness of the coating layer, and effectively ensuring the uniformity of the thickness of the coating layer. Compared with manual coating, the uniformity of the coating layer thickness is significantly improved, avoiding the problem that the extrusion speed and extrusion amount of the coating agent cannot be controlled in the background technology, affecting the uniformity of the coating agent covering the surface of the propellant column, and the coating agent is discharged through the discharge port of the annular structure, and the discharge uniformity is higher.

[0046] Embodiment 2: Based on Embodiment 1, the driving device is optimally designed, and the driving device includes a driving cylinder 31. The driving cylinder 31 and the movable fixture 2 are arranged on the same side of the fixed fixture 1. The air pipe 34 of the driving cylinder 31 is connected to the sliding plate 32. The card slot of the sliding plate 32 is connected to the fixed slide rail 33 and can move on the fixed slide rail 33. When the cylinder is inhaled and deflated, the sliding plate 32 is controlled by the air pipe 34 to move back and forth on the fixed slide rail 33. The fixed slide rail 33 is parallel to the moving direction of the movable fixture 2, that is, the movable fixture 2 and the sliding plate 32 move synchronously, and the moving directions are consistent.

[0047] The side of the sliding plate 32 is vertically fixedly connected to one end of the connecting arm 35, and the other end of the connecting arm 35 is fixedly connected to the two ends of the outer side surface of the movable fixture 2 through the connecting support wall 351, thereby improving the connection stability between the connecting arm 35 and the movable fixture 2, thereby driving the cylinder 31 to control the sliding plate 32 to move on the fixed slide rail 33, and the sliding plate 32 drives the movable fixture 2 to move synchronously through the connecting arm 35, extends into the mounting inner hole 11 of the fixed fixture 1, and adjusts the extension distance to control the size of the discharge port of the discharge channel 4, and adaptively controls the discharge amount of the coating agent. By setting a driving device of this structure, the stability of the movable fixture 2 after it extends into the mounting inner hole 11 of the fixed fixture 1 can be improved, ensuring that the coating tooling as a whole can smoothly coat the surface of the propellant grain when moving, thereby improving the coating stability.

[0048] Furthermore, a horizontally arranged limiting rod 36 is vertically fixed to one side of the connecting arm 35 close to the driving cylinder 31. When the driving cylinder 31 drives the sliding plate 32 to retract, the movable fixture 2 moves toward the outside of the mounting inner hole 11. After the limiting rod 36 moves a certain distance toward the driving cylinder 31, its movable end can abut against the surface of the positioning plate 311 of the driving cylinder 31, limiting the sliding plate 32 from continuing to move, controlling the maximum distance that the movable fixture 2 can move outward, and avoiding excessive outward movement of the movable fixture 2, resulting in a gap between the movable fixture 2 and the fixed positioning block 12 being too large, resulting in the discharge port of the discharge channel 4 being too large, and the coating layer being too thick and uneven during coating.

[0049] Furthermore, the upper part of the fixed fixture 1, the fixed slide rail 33 and the driving cylinder 31 are fixed on the coating fixture connecting plate 5 in sequence, and the coating fixture connecting plate 5 is connected to the servo drive slide group. The servo drive slide group includes a servo driver and a sliding device, which is similar to the structure of the driving device. The coating fixture connecting plate 5 is fixedly connected to the slide plate in the sliding device, and the slide plate can move back and forth at a uniform speed on the slide in the sliding device. One end of the slide plate is connected to the output end of the servo driver, and the servo driver controls the slide plate to move in the coating direction on the slide. The entire coating tool is driven by the servo drive slide group. When the propellant grain is coated, the coating tool covers the propellant grain and discharges the material uniformly according to the set coating agent discharge amount, and moves from the head to the tail of the propellant grain at a preset running speed, and the uniform coating of the propellant grain is achieved during the movement.

[0050] Among them, the driving cylinder 31 and the servo driver are both electrically connected to the PLC (programmable logic controller). The PLC controls the moving direction and moving distance of the output end of the driving cylinder 31 according to the set program, controls the opening size and discharge amount of the discharge port of the discharge channel 4, and controls the moving speed of the servo driver, so as to adjust the thickness of the coating layer of the propellant grain according to different needs.

[0051] Example 3: On the basis of Example 1, this example provides a coating agent channel of a new type of annular automatic coating tooling, in which the outer ring block 41 and the inner ring block 42 are detachably connected to both sides of the fixed fixture 1, and both are annular block structures, and extend into the mounting inner hole 11 of the fixed fixture 1, and the gap between the opposite surfaces of the two constitutes a coating agent channel 43 for the coating agent to flow. By setting the outer ring block 41 and the inner ring block 42 to form the coating agent channel 43, it is easier to adjust the structure and shape of the coating agent channel 43, and the outer ring block 41 and the inner ring block 42 are detachably connected to the fixed fixture 1, which is also easier to disassemble the outer ring block 41 and the inner ring block 42, and to perform timely maintenance on the inside of the fixed fixture 1. The coating agent channel 43 is connected to the feed port 13 and the discharge channel 4, that is, the two ends of the coating agent channel 43 are respectively connected to the feed port 13 and the discharge channel 4 of the fixed fixture 1, and the coating agent enters the fixed fixture 1 from the feed port 13 of the fixed fixture 1, and flows from the fixed fixture 1 into the coating agent channel 43, and then flows from the coating agent channel 43 into the discharge channel 4, and finally discharged from the discharge port of the discharge channel 4 to coat the propellant grain.

[0052] Embodiment 4: Based on Embodiment 3, an outer ring block 41 and an inner ring block 42 are optimally designed. The outer side surfaces of the outer ring block 41 and the inner ring block 42 are fixedly connected to the two sides of the fixed fixture 1 by means of threaded connection respectively. The two extend into the installation inner hole 11 and are matched with the inner wall of the installation inner hole 11 in the circumferential direction with zero clearance, so as to prevent the coating agent from overflowing from the gap between the outer ring block 41 and the inner ring block 42 and the installation inner hole 11; the movable fixture 2 extends into the inner ring block 42 and is matched with it, which will not affect the free entry and exit of the movable fixture 2 into the inner ring block 42, and the coating agent will not overflow from the connection.

[0053] Furthermore, the fixed positioning block 12 is clamped in the annular groove formed on the inner end face of the outer ring block 41, and an annular groove is formed on one end face of the movable fixture 2 close to the fixed positioning block 12 (i.e., the end extending into the inner ring block 42), in which a movable positioning block 21 is clamped, and a gap between the opposite surfaces of the movable positioning block 21 and the fixed positioning block 12 is a discharge channel 4, and the movable positioning block 21 and the fixed positioning block 12 are also annular block structures, and the discharge channel 4 is composed of two detachable movable positioning blocks 21 and fixed positioning blocks 12, and the corresponding movable positioning blocks 21 and fixed positioning blocks 12 can be quickly replaced according to the outer diameter of the propellant grain, which has higher adaptability and solves the problem that the existing automatic coating equipment in the background technology cannot adapt to propellant grains of different models.

[0054] The coating agent channel 43 and the discharge channel 4 gradually narrow along the flow direction of the coating agent, that is, the distance between the opposite surfaces of the outer ring block 41 and the inner ring block 42 constituting the coating agent channel 43 gradually decreases from the outer ring to the inner ring. Similarly, the distance between the opposite surfaces of the movable positioning block 21 and the fixed positioning block 12 constituting the discharge channel 4 gradually decreases from the outer ring to the inner ring. The coating agent channel 43 and the discharge channel 4 form a curved channel from large to small, which can effectively control the extrusion speed and extrusion amount of the coating agent, and play a certain buffering role, ensuring the uniformity of the coating agent discharge from the annular discharge port of the entire discharge channel 4. The outlet of the coating agent channel 43 is connected to the inlet of the discharge channel 4, and the coating agent can flow smoothly from the coating agent channel 43 into the discharge channel 4.

[0055] In addition, by adjusting the position of the movable positioning block 21, the size of the discharge channel 4 can be changed, the thickness of the coating layer can be controlled, and the uniformity of the coating layer thickness can be effectively ensured. Compared with manual coating, the uniformity of the coating layer thickness is significantly improved, and when the opposite surface of the movable positioning block 21 and the fixed positioning block 12 are connected close to one end of the inner ring side, the discharge port of the discharge channel 4 is closed. When the coating is completed, the drive device controls the movable fixture 2 to continue to move toward the inner side of the inner ring block 42 until the inner ring block 42 is tightly connected to the fixed positioning block 12, and the discharge port of the discharge channel 4 is automatically closed, effectively preventing the volatilization of the solvent in the coating agent, thereby preventing the coating agent channel 43 from being blocked, reducing the failure rate of the coating tooling, and ensuring the continuity of the production process.

[0056] Furthermore, the inner annular surfaces of the fixed positioning block 12 and the movable positioning block 21 are flush, the inner annular diameters of the two are matched with the diameter of the propellant grain, and the spacing distance between the inner annular surfaces of the two and the surface of the propellant grain is in the range of 1-2mm, which is suitable for the coating thickness of different products; the inner annular diameters of the outer annular block 41 and the movable fixture 2 are both larger than the inner annular diameters of the fixed positioning block 12 and the movable positioning block 21, that is, the inner annular surfaces of the outer annular block 41 and the movable fixture 2 will not exceed the inner annular surfaces of the fixed positioning block 12 and the movable positioning block 21 inward, so as to avoid affecting the normal coating process of the propellant grain, and it is also more conducive to adapting to propellant grains of different diameters.

[0057] Embodiment 5: Based on Embodiment 3, a preferred design is performed, in which four feed ports 13 are provided on the fixed jig 1, and the lower portion of the fixed jig 1 is a square frame structure. The four feed ports 13 are evenly arranged at the four corners of the lower portion of the fixed jig 1. By providing multiple feed ports 13 and evenly arranging them at the four corners of the lower portion of the fixed jig 1, the feeding speed of the coating agent can be increased, as well as the uniformity of the coating agent at different positions after entering the coating tooling.

[0058] In addition, the material of the contact surface in direct contact with the coating agent in the coating tooling can be changed according to the relevant physical and chemical properties of the coating agent, so as to adapt to the coating operations of various liquid coating agents and realize automatic coating of various liquid coating agents.

[0059] The outer ring surface of the inner ring block 42 is inwardly recessed to form an annular channel 44, and the annular channel 44 is connected to the feed port 13 of the fixed fixture 1 through the feed channel 14 in the fixed fixture 1. Figure 4 As shown, the feed port 13 of the fixed fixture 1 is connected to a feed channel 14, and the discharge port of each feed channel 14 is connected to the annular channel 44. A plurality of pressure-dividing mixing holes 45 are provided on the side wall of the annular channel 44 close to the coating agent channel 43, and the pressure-dividing mixing holes 45 are evenly arranged along the circumference of the side wall of the side, that is, the pressure-dividing mixing holes 45 are provided in the side wall of the annular channel 44 close to the coating agent channel 43 and are connected to the coating agent channel 43, and the overall arrangement is annular and evenly distributed, and the diameter of the pressure-dividing mixing holes 45 is 4 mm. By opening pressure-dividing mixing holes 45 evenly arranged along the circumferential direction of the side wall of the annular channel 44, the coating agent entering the annular channel 44 from the feed channel 14 can be evenly diffused from the pressure-dividing mixing holes 45 into the coating agent channel 43, and fill the coating agent channel 43, and is evenly extruded through the discharge port of the discharge channel 4. The coating agent extruded into the coating agent channel 43 through the pressure-dividing mixing holes 45 can squeeze out the bubbles contained in the coating agent, thereby improving the appearance quality of the coating layer, and solving the problem that bubbles may exist in the coating agent pushed out from the discharge port of the existing automatic coating equipment in the background technology, thereby affecting the appearance quality of the coating layer.

[0060] Embodiment 6: Based on the above embodiment, this embodiment provides a new type of annular automatic wrapping tool wrapping method, comprising the following steps:

[0061] Step 1: According to the characteristics of the propellant grain, the moving speed of the coating tooling and the extension distance of the output end of the driving cylinder 31 are set;

[0062] Step 2: Start the driving cylinder 31, and the driving cylinder 31 pushes the movable fixture 2 to the set position in the inner ring block 42, that is, the driving cylinder 31 controls the sliding plate 32 to move a set distance on the fixed slide rail 33, and the sliding plate 32 sends the movable fixture 2 to the set position in the inner ring block 42 through the connecting arm 35, sets the gap distance between the opposite surfaces of the movable positioning block 21 and the fixed positioning block 12, sets the size of the discharge port of the discharge channel 4, and then injects the coating agent from the four feed ports 13 of the fixed fixture 1;

[0063] Step 3: The coating agent enters the annular channel 44 from the four feed ports 13 of the fixed fixture 1 through the feed channel 14, and is evenly diffused into the coating agent channel 43 from the partial pressure mixing hole 45 of the annular channel 44, and flows into the discharge channel 4 along the coating agent channel 43, and is evenly extruded through the discharge port of the discharge channel 4;

[0064] Step 4: Put the propellant grain into the middle of the discharge channel 4, with the head of the propellant grain facing the discharge port of the discharge channel 4, start the servo drive slide group, and the servo drive slide group drives the coating tooling to move at a uniform speed along the coating direction through the coating fixture connection plate 5. During the movement, the coating agent extruded through the discharge port of the discharge channel 4 is evenly coated on the surface of the propellant grain to form a coating layer;

[0065] Step 5: When the coating tool moves from the head to the tail of the propellant column, the driving device continues to push the movable fixture 2 to move into the fixed fixture 1, so that the movable positioning block 21 is connected with the fixed positioning block 12, and the discharge channel 4 is closed, blocking the coating agent from continuing to discharge, and completing the coating.

[0066] By coating the propellant grains using the coating method of the coating tooling, it is possible to achieve automatic coating of the propellant grains with a variety of liquid coating agents, greatly improving the appearance quality, coating quality and consistency of the coating layer of the propellant grains, reducing the thickness deviation of the coating layer of the propellant grains, and reducing the degree of manual participation in the coating process. It can also be combined with automatic loading and unloading devices, manipulators and other equipment on the market to achieve automation of the entire coating process.

[0067] The above embodiments only express the specific implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the protection scope of the present application. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the technical solution concept of the present application, and these all belong to the protection scope of the present application.

Claims

1. A new type of annular automatic wrapping tool, characterized by: The invention comprises a horizontally arranged fixed fixture (1), a movable fixture (2) and a driving device for driving the movable fixture (2) to move. The fixed fixture (1) is provided with an installation inner hole (11), and a fixed positioning block (12) is arranged in the installation inner hole (11). The movable fixture (2) is pushed by the driving device to extend into the installation inner hole (11) and forms a discharge channel (4) for the coating agent to flow out with the fixed positioning block (12). The discharge channel (4) is communicated with a feed port (13) of the fixed fixture (1); the propellant grain passes through the middle of the discharge channel (4) and is coaxially spaced with the discharge channel. When the coating tool moves, the coating agent flows out from the discharge channel (4) and is evenly coated on the surface of the propellant grain.

2. According to claim 1, the new type of annular automatic covering tool is characterized by: The driving device comprises a driving cylinder (31), wherein the driving cylinder (31) and the movable fixture (2) are arranged on the same side of the fixed fixture (1), and the driving cylinder (31) controls the sliding plate (32) to move back and forth on the fixed slide rail (33), and the moving direction of the fixed slide rail (33) and the movable fixture (2) are parallel; the side surface of the sliding plate (32) is vertically fixedly connected to one end of the connecting arm (35), and the other end of the connecting arm (35) is fixedly connected to the movable fixture (2).

3. A new type of annular automatic wrapping tool according to claim 2, characterized in that: A horizontally arranged limiting rod (36) is also fixed to one side of the connecting arm (35) close to the driving cylinder (31); the movable end of the limiting rod (36) can abut against the surface of the positioning plate (311) of the driving cylinder (31) to control the maximum distance that the movable fixture (2) can move outward.

4. According to claim 2, the new type of annular automatic covering tool is characterized by: The upper part of the fixed jig (1), the fixed slide rail (33) and the driving cylinder (31) are fixed on a coating jig connection plate (5) in sequence. The coating jig connection plate (5) is connected to a servo drive slide group. The servo drive slide group drives the coating tooling to move at a uniform speed through the coating jig connection plate (5) to uniformly coat the surface of the propellant grain.

5. A coating agent channel using the novel annular automatic coating tooling according to claim 1, characterized in that: The outer ring block (41) and the inner ring block (42) are detachably connected to the two sides of the fixing fixture (1), and both extend into the mounting inner hole (11) to form a coating agent channel (43) through which the coating agent flows, and the coating agent channel (43) is connected to the feed port (13) and the discharge channel (4).

6. The coating agent channel of the novel annular automatic coating tool according to claim 5 is characterized in that: The outer side surfaces of the outer ring block (41) and the inner ring block (42) are respectively fixedly connected to the two sides of the fixed fixture (1) by means of threaded connection, and both are matched with the inner wall of the mounting inner hole (11) with zero clearance; the movable fixture (2) extends into the inner ring block (42) and is matched and connected thereto.

7. The coating agent channel of the novel annular automatic coating tool according to claim 5 is characterized by: The fixed positioning block (12) is clamped in an annular groove formed on the inner end surface of the outer ring block (41); a movable positioning block (21) is clamped in an annular groove on one end surface of the movable fixture (2) close to the fixed positioning block (12); the opposite surface of the movable positioning block (21) and the fixed positioning block (12) is a discharge channel (4); the coating agent channel (43) and the discharge channel (4) gradually narrow along the flow direction of the coating agent; the size of the discharge channel (4) can be changed by adjusting the position of the movable positioning block (21); when the movable positioning block (21) is connected to the fixed positioning block (12), the discharge channel (4) is closed.

8. The coating agent channel of the novel annular automatic coating tool according to claim 7 is characterized by: The inner ring surfaces of the fixed positioning block (12) and the movable positioning block (21) are flush, the inner ring diameters of the two are matched with the diameter of the propellant grain, and the spacing distance between the inner ring surfaces of the two and the surface of the propellant grain is in the range of 1-2 mm; the inner ring diameters of the outer ring block (41) and the movable fixture (2) are both larger than the inner ring diameters of the fixed positioning block (12) and the movable positioning block (21).

9. The coating agent channel of the novel annular automatic coating tool according to claim 5 is characterized in that: The fixed fixture (1) is provided with four feed ports (13) which are evenly arranged at the four corners of the lower part of the fixed fixture (1); an annular channel (44) is provided on the outer ring surface of the inner ring block (42); the annular channel (44) is communicated with the feed port (13) of the fixed fixture (1) through the feed channel (14) in the fixed fixture (1), and a plurality of pressure-dividing mixing holes (45) are provided on the side wall close to the coating agent channel (43); the pressure-dividing mixing holes (45) are evenly arranged along the circumference of the side wall of the side and communicated with the coating agent channel (43); the diameter of the pressure-dividing mixing holes (45) is 4 mm.

10. A coating method using the novel annular automatic coating tool according to any one of claims 1 to 9, characterized in that: The following steps are involved: Step 1: according to the characteristics of the propellant grain, the moving speed of the coating tool and the extension distance of the output end of the driving cylinder (31) are set; Step 2: Start the driving cylinder (31), which pushes the movable fixture (2) to a set position in the inner ring block (42), and injects the coating agent from the four feed ports (13) of the fixed fixture (1); Step 3: The coating agent enters the annular channel (44) from the four feed ports (13) of the fixed fixture (1) through the feed channel (14), and is evenly diffused from the partial pressure mixing hole (45) of the annular channel (44) to the coating agent channel (43), and flows into the discharge channel (4) along the coating agent channel (43), and is evenly extruded through the discharge port of the discharge channel (4); Step 4: placing the propellant grain into the middle of the discharge channel (4), with the head of the propellant grain facing the discharge port of the discharge channel (4), starting the servo drive slide group, and the servo drive slide group drives the coating tooling to move at a uniform speed along the coating direction through the coating jig connection plate (5). During the movement, the coating agent extruded through the discharge port of the discharge channel (4) is evenly coated on the surface of the propellant grain to form a coating layer; Step 5: When the coating tool moves from the head to the tail of the propellant grain, the driving device continues to push the movable fixture (2) to move into the fixed fixture (1), so that the movable positioning block (21) is connected with the fixed positioning block (12), and the discharge channel (4) is closed, blocking the coating agent from continuing to discharge, and the coating is completed.

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