Tubular film spraying machine and method

Abstract

The present invention provides a tubular film spraying machine and method, belonging to the field of surface coating. The tubular film spraying machine includes: a frame and a linear motion guide assembly, a linear motion assembly, a linear drive assembly, and a station conversion assembly disposed thereon; the linear motion assembly includes an internal assembly, a bearing, and an external assembly; the linear drive assembly is capable of driving the linear motion assembly to move along the linear motion guide assembly; and the station conversion assembly is capable of driving the external assembly of the linear motion assembly to rotate. The present invention enables spraying of the inner surface of a tubular body, resulting in a coating of uniform thickness on the inner surface of the tubular body, thereby resolving the problems of uneven coating thickness and low work efficiency caused by manual spraying.

Description

Technical Field

[0001] The invention belongs to the field of surface coating of objects, and in particular relates to a tubular film spraying machine and method, which are used for spraying a tubular inner surface so as to obtain a coating with uniform thickness on the tubular inner surface. Background Art

[0002] Currently, most spray machines on the market are used for spraying on the surface of objects, and the surface of the object is flat rather than cylindrical, such as spraying putty powder on the wall.

[0003] Currently, there are no spray machines available for spraying the interior of tubular surfaces, especially those of slender tubes, requiring manual labor. Specifically, the operator inserts a slender nozzle mounted on a spray gun nozzle into a slender round tube, inserting the nozzle into the bottom of the tube. The operator then opens the spray gun and sprays the inside of the tube, moving the gun outward in a straight line until the entire inner surface of the tube is coated.

[0004] The linear movement of the spray gun is manually performed, making it difficult to maintain a uniform speed. Furthermore, due to the slenderness of the round tube, the nozzle is also slender. If the round tube is placed vertically, the operator would find it difficult to move the spray gun comfortably for ergonomic reasons. Therefore, the round tube must be placed horizontally. The weight of the slender round tube and the slender nozzle creates significant interference, resulting in a significant deviation between the nozzle and the tube's axis. Consequently, it is difficult to ensure a uniform coating thickness on the inner surface of the round tube. Operators can only spray one round tube at a time, and prolonged work leads to fatigue and low efficiency. Summary of the Invention

[0005] The purpose of the present invention is to solve the difficulties existing in the above-mentioned prior art and provide a tubular film spraying machine and method to realize spraying on the inner surface of the tubular film, so that the inner surface of the tubular film obtains a coating with uniform thickness, and solves the problems of uneven coating thickness and low work efficiency caused by manual spraying.

[0006] The present invention is achieved through the following technical solutions:

[0007] A first aspect of the present invention provides a tubular film spraying machine, comprising: a frame and a linear motion guide assembly, a linear motion assembly, a linear drive assembly, and a station conversion assembly arranged thereon;

[0008] The linear motion assembly includes an internal assembly, a bearing, and an external assembly;

[0009] The linear drive assembly is capable of driving the linear motion assembly to move along the linear motion guide assembly;

[0010] The workstation conversion component can drive the external component in the linear motion component to rotate.

[0011] A further improvement of the present invention is that the frame includes a top plate and a bottom plate;

[0012] The top plate is located above the bottom plate, and the top plate is parallel to the bottom plate, and the top plate and the bottom plate are connected by columns;

[0013] The linear drive assembly and the spray gun are arranged on the top plate; the spray gun is connected to a nozzle;

[0014] The workstation conversion assembly is arranged on the bottom plate;

[0015] A plurality of linear motion guide components are arranged between the top plate and the bottom plate.

[0016] A further improvement of the present invention is that the linear motion guide assembly includes a plurality of first guide rods and linear bearings;

[0017] The upper end of each first guide rod is connected to the top plate, and the lower end is connected to the bottom plate;

[0018] A plurality of linear bearings are provided on each first guide rod;

[0019] Or the linear motion guide assembly includes a plurality of guide rails and sliders;

[0020] The upper end of each guide rail is connected to the top plate, and the lower end is connected to the bottom plate;

[0021] A plurality of sliders are arranged on each guide rail.

[0022] A further improvement of the present invention is that the internal assembly comprises: an internal frame, the internal frame comprising an upper plate, a connecting rod and a lower plate arranged coaxially;

[0023] The upper end of the connecting rod is connected to the upper plate, and the lower end is connected to the lower plate;

[0024] The upper plate and the lower plate are both disc-shaped structures, and have a central through hole coaxial with the central through hole;

[0025] The inner rings of the two bearings are connected to the upper plate and the lower plate respectively;

[0026] A buffer is installed on the lower plate;

[0027] The upper plate is connected to a linear bearing or a slider.

[0028] A further improvement of the present invention is that the external component includes: an upper bearing seat, a lower bearing seat, and a plurality of clamping optical axes installed between the upper bearing seat and the lower bearing seat;

[0029] The upper bearing seat is located at the top and is connected to the outer ring of the upper bearing;

[0030] The lower bearing seat is located at the bottom and is connected to the outer ring of the lower bearing;

[0031] The upper end of each of the clamping optical axes is connected to the upper bearing seat, and the lower end is connected to the lower bearing seat;

[0032] The central axis of each clamping optical axis is parallel to the central axis of the inner frame.

[0033] A further improvement of the present invention is that a multi-layered retaining ring coaxial with the upper bearing seat and the lower bearing seat is provided between the upper bearing seat and the lower bearing seat;

[0034] A plurality of holes are opened on each layer of the clamping ring, and each hole of each layer of the clamping ring is sleeved on each clamping optical axis;

[0035] A plurality of spacers are sleeved on each clamping optical axis, and each spacer is located between two adjacent clamping rings;

[0036] Each layer of the clamping ring is an annular structure, and a plurality of clamping plates are provided on the circumferential edge of each layer of the clamping ring;

[0037] Each of the clamping plates is a sheet-like structure, one side of which is connected to the clamping ring, and the edge of the other side of which is provided with two clamping grooves, into which the sprayed tube can be clamped;

[0038] Two semicircular assembly grooves are arranged between the two clamping grooves.

[0039] A further improvement of the present invention is that a plurality of upper positioning pins are provided on the upper end surface of the upper bearing seat, each upper positioning pin is a rod-shaped structure, the lower end of which is connected to the upper bearing seat, and the upper end of which is a hemispherical structure;

[0040] A lower pressure plate coaxial with the lower bearing seat is connected to the lower part of the lower bearing seat;

[0041] A plurality of lower positioning sleeves and a plurality of trays are provided below the lower pressing plate;

[0042] A plurality of through holes are provided on the lower pressing plate, a flow guide sleeve is provided in each through hole, a flow guide hole is provided in the flow guide sleeve, and the flow guide hole is communicated with the tray.

[0043] A further improvement of the present invention is that the linear motion assembly further includes a positioning plate and at least two sets of positioning assemblies; each set of positioning assemblies includes: a connecting plate, a second guide rod and a positioning adjustment sleeve;

[0044] The second guide rod is located outside the external component, the upper end of the second guide rod is connected to the top plate, and the lower end is connected to the bottom plate; the positioning adjustment sleeve is sleeved on the second guide rod;

[0045] One end of the connecting plate is provided with a through hole, and the second guide rod passes through the through hole; the other end of the connecting plate is fixedly connected to the positioning plate;

[0046] The connecting plate is located above the positioning and adjusting sleeve;

[0047] An upper positioning sleeve is provided on the positioning plate, and a central through hole is formed on the upper positioning sleeve, into which the upper positioning pin can be inserted; the number of the upper positioning sleeves is an integer multiple of the number of the upper positioning pins;

[0048] The lower end of the nozzle passes through the positioning plate;

[0049] The positioning plate is connected to a linear bearing or a slider, and the linear bearing or the slider is located above the linear bearing or the slider connected to the upper plate;

[0050] Circular holes with the same diameter as the assembly groove on the clamping plate are provided on the positioning plate and the lower pressing plate. The circular holes on the positioning plate, the circular holes on the lower pressing plate and the corresponding assembly groove on the clamping plate are coaxial in the vertical direction.

[0051] A further improvement of the present invention is that the linear drive assembly includes: a motor, a coupling, and a screw pair; the screw pair includes a screw and a nut; the upper end of the screw is connected to the top plate through a bearing, and the lower end of the screw is located in the central through hole of the connecting rod; the nut is connected to the center of the upper plate;

[0052] The workstation conversion drive assembly includes: a cylinder, a swing arm and a pin; one end of the swing arm is connected to the piston rod of the cylinder, and the other end is connected to the pin; a groove is opened on the base plate, and the upper end of the pin can be inserted into the lower positioning sleeve after passing through the groove.

[0053] A second aspect of the present invention provides a tubular membrane spraying method, which is implemented using the above-mentioned tubular membrane spraying machine, and comprises:

[0054] (1) Fix the sprayed tube on each mounting plate;

[0055] (2) The cylinder drives the external component to rotate to the set angle and enter the next station;

[0056] (3) The motor drives the lead screw to rotate, the linear moving assembly moves upward, the nozzle extends into the inner cavity of the sprayed tube, and the linear moving assembly pushes the positioning plate to move upward together. After moving into position, it stops moving upward. At this time, the bottom of the sprayed tube is close to the end of the nozzle;

[0057] (4) The piston rod of the cylinder retracts, the spray gun starts to spray, and at the same time the linear motion assembly and the positioning plate move downward at a set speed until the positioning plate stops moving. At this time, the spray gun is closed and spraying stops;

[0058] (5) The linear moving assembly continues to move downward, and after the lower positioning sleeve is inserted into the pin shaft, the linear moving assembly stops moving;

[0059] (6) After loading is completed, the cylinder drives the external component to rotate the set angle, enter the next station, and then return to step (3).

[0060] Compared with the prior art, the beneficial effects of the present invention are: the present invention realizes spraying on the tubular inner surface, so that the tubular inner surface obtains a coating with uniform thickness, solving the problems of uneven coating thickness and low work efficiency caused by manual spraying. BRIEF DESCRIPTION OF THE DRAWINGS

[0061] Figure 1 A schematic structural diagram of the tubular film spraying machine of the present invention.

[0062] Figure 2-1 Figure 1 A partial enlarged schematic diagram of part A in FIG.

[0063] Figure 2-2 Figure 1 A partial enlarged schematic diagram of part B in FIG.

[0064] Figure 3 A schematic structural diagram of a station conversion drive assembly in a tubular film spraying machine according to the present invention.

[0065] Figure 4 A schematic structural diagram of a linear motion assembly in a tubular film spraying machine according to the present invention.

[0066] Figure 5 Simplified schematic diagram of the spray machine structure.

[0067] Figure 6 A schematic structural diagram of the inner frame in the tubular film spraying machine of the present invention.

[0068] Figure 7 A schematic structural diagram of a tray in a tubular film spraying machine according to the present invention.

[0069] Figure 8 A schematic structural diagram of a mounting plate in a tubular film spraying machine according to the present invention.

[0070] Figure 9 A schematic structural diagram of the tubular film spraying machine of the present invention when the linear moving component reaches the highest point.

[0071] Figure 10 A schematic structural diagram of the screw sleeve and positioning plate in the tubular film spraying machine of the present invention.

[0072] in:

[0073] Figure 1 Middle: frame 1, linear motion component 2, spray gun 3, motor 4, coupling 5, screw 6, counterweight 7, electric control cabinet 8.

[0074] Figure 2-1 Middle: linear bearing 9, nozzle 10, upper positioning sleeve 11, positioning plate 12, first guide rod 13, spring 14, rod 15, nut 16, positioning adjustment sleeve 17, second guide rod 18.

[0075] Figure 2-2 Middle: bracket 3-1, set screw 3-2, spray gun mounting shaft 3-3.

[0076] Figure 3 Middle: cylinder 19, swing arm 20, pin 21, limit screw 22.

[0077] Figure 4 Middle: internal component 2-1, bearing 2-2, external component 2-3, upper positioning pin 2-4, sprayed tube 2-5, mounting plate 2-6, lower positioning sleeve 2-7, tray 2-8, lower pressure plate 2-9.

[0078] Figure 10 Middle: first polyurethane pad 23, stud 24, nut 25, locking sleeve 26, upper bearing seat 27, clamping optical axis 28, homemade nut 29, second polyurethane pad 30, inner frame 31, deep groove ball bearing 32, screw sleeve 33. DETAILED DESCRIPTION

[0079] The present invention is described in further detail below with reference to the accompanying drawings:

[0080] The present invention provides a tubular film spraying machine for spraying a tubular inner surface so that the tubular inner surface obtains a coating with a uniform thickness. Figures 1 to 10 As shown, the tubular film spraying machine comprises a frame 1, a linear guide assembly, a linear motion assembly 2, a linear drive assembly, and a station conversion assembly. The linear motion assembly comprises an internal assembly, bearings, and an external assembly. A spray gun is mounted on the frame 1, connected to a nozzle. The tube to be sprayed is mounted on the linear motion assembly 2, and the nozzle can be inserted into the tube to spray the inner surface of the tube.

[0081] The linear motion guide assembly is arranged on the frame, and the linear motion assembly can move along the linear motion guide assembly; the linear drive assembly is arranged at the top end of the frame, and can drive the linear motion assembly to move linearly; the workstation conversion assembly is arranged at the bottom end of the frame, and can drive the external assembly in the linear motion assembly to rotate.

[0082] The embodiments of the present invention are as follows:

[0083] [Example 1]

[0084] The frame 1 comprises a top plate and a bottom plate, wherein the top plate is located above the bottom plate and is parallel to the bottom plate, and the top plate and the bottom plate are connected by columns. If the frame 1 adopts a vertical type, a support frame can also be provided below the bottom plate to support the bottom plate.

[0085] A linear drive assembly and a spray gun are provided on the top plate, a station conversion assembly is provided on the bottom plate, and a plurality of linear motion guide assemblies are provided between the top plate and the bottom plate. Specifically, the spray gun can be installed in the following manner: Figure 2-2 In the illustrated method, the bracket 3-1 is fixed to the top plate with screws, the spray gun mounting shaft 3-3 is passed through the matching hole in the bracket 3-1, the matching hole having an open top end, and the locking screw on the bracket 3-1 holds the spray gun mounting shaft 3-3 tightly. The two spray guns 3 are respectively inserted from both ends of the spray gun mounting shaft 3-3, and the set screws 3-2 secure the spray guns 3 to the spray gun mounting shaft 3-3, thereby achieving a fixed connection between the spray guns and the top plate. Other fixing methods can also be used to fix the spray guns 3 to the top plate. A nozzle 10 is connected below each spray gun. Each nozzle 10 adopts an existing nozzle, which is tubular, one end of which is sealed with the nozzle of the spray gun 3, and the other end has a nozzle hole for spraying the spray liquid.

[0086] [Example 2]

[0087] The linear motion guide assembly can adopt various existing linear motion guide structures, such as optical axis and linear bearing, or linear guide rail pair (such as guide rail and slider). Figure 2-1 The linear motion guide assembly in the illustrated embodiment uses a first guide rod 13 and a linear bearing 9. The upper end of each first guide rod 13 is connected to the top plate, and the lower end is connected to the bottom plate. The linear bearing 9 is sleeved on the first guide rod 13, and multiple linear bearings 9 can be provided on the first guide rod 13.

[0088] [Example 3]

[0089] The linear motion component 2 includes an internal component 2-1, a bearing 2-2 and an external component 2-3. The internal component 2-1 includes: an inner frame 31 and a buffer. Figure 6 As shown, the inner frame 31 includes an upper plate, a connecting rod and a lower plate arranged coaxially. The upper end of the connecting rod is connected to the upper plate, and the lower end is connected to the lower plate. The upper plate and the lower plate are both disc-shaped structures, and a central through hole coaxial with the central through hole is opened on the disc-shaped structure, and multiple through holes are opened around the central through hole ( Figure 6In the illustrated embodiment, the four holes surrounding the central through-hole are used to mount the linear bearing 9, and the other two holes are used to mount the rod 15. A different number of through-holes may be provided as needed. To increase strength, multiple reinforcing ribs are provided between the lower end surface of the upper plate and the upper end of the connecting rod, and multiple reinforcing ribs are provided between the upper end surface of the lower plate and the lower end of the connecting rod.

[0090] The inner rings of the two bearings 2-2 are connected to the upper and lower plates, respectively. Specifically, the inner holes of the bearing inner rings provide a clearance fit between the upper and lower plates, and are mounted in the same manner as the bearing inner rings to the shaft, for example, by securing them to the upper and lower plates via a shoulder or gland. Preferably, the bearings 2-2 utilize deep groove ball bearings 32. The buffer is a mature, existing product, with buffer mounting holes provided on the lower plate of the inner frame. The buffer is installed below the lower plate through these holes.

[0091] like Figure 4 As shown, the external component 2-3 includes an upper bearing seat 27, a lower bearing seat, and multiple clamping optical axes 28 installed between the upper and lower bearing seats. The upper bearing seat 27 is located at the top and connected to the outer ring of the upper bearing 2-2. The lower bearing seat is located at the bottom and connected to the outer ring of the lower bearing 2-2. That is, the upper bearing 2-2 is installed between the upper plate and the upper bearing seat 27, and the lower bearing 2-2 is installed between the lower plate and the lower bearing seat. In this way, the upper bearing seat 27 can rotate relative to the upper plate via the upper bearing 2-2, and the lower bearing seat can rotate relative to the lower plate via the lower bearing 2-2. The upper bearing seat 27 and the lower bearing seat are clearance-matched with the outer surface of the bearing outer ring. The upper and lower bearing seats can be installed using existing installation methods and will not be described in detail here.

[0092] The upper end of each of the clamping optical axes 28 is connected to the upper bearing seat 27 (e.g., by screws), and the lower end is connected to the lower bearing seat (e.g., by screws), so that each clamping optical axis can rotate with the upper and lower bearing seats 27. The central axis of each clamping optical axis is parallel to the central axis of the inner frame.

[0093] Multiple layers of retaining rings are provided between the upper bearing seat 27 and the lower bearing seat from top to bottom. The upper bearing seat 27, the lower bearing seat and the retaining rings are coaxially arranged. A plurality of holes are opened on each layer of retaining rings. The number of holes is the same as the number of retaining optical axes and corresponds one to one. The holes of each layer of retaining rings are sleeved on each retaining optical axis. A plurality of spacers are sleeved on each retaining optical axis. Each spacer is located between two adjacent retaining rings and is used to separate the layers of retaining rings so that the sprayed tube 2-5 has a support every other section in the axial direction. In this way, the sprayed tube 2-5 is firmly installed and the deformation of the sprayed tube 2-5 is reduced.

[0094] Specifically, each layer of the clamping ring is annular in structure, and a plurality of clamping plates 2-6 are provided on the circumferential edge of each layer of the clamping ring. Preferably, the plurality of clamping plates 2-6 on the same layer of the clamping ring are evenly distributed on the circumference. The structure of the clamping plates 2-6 is as follows: Figure 8 As shown, it is a rectangular sheet structure with a mounting hole on one side for connecting the mounting plate and the mounting ring by screws, and a plurality of arc-shaped slots on the edge of the other side for mounting the sprayed pipes 2-5. The size of the arc-shaped slots can be designed according to the different diameters of the sprayed pipes, and the sprayed pipes can be clamped into the arc-shaped slots.

[0095] Preferably, two symmetrical flat surfaces are provided at the opening of each arcuate slot, with the distance between the two flat surfaces being slightly smaller than the diameter of the arcuate slot. This makes it easier for the sprayed tubes 2-5 to be clamped in the arcuate slot. After being clamped in the arcuate slots on the clamping plates 2-6 connected to the clamping rings at each layer, the sprayed tubes 2-5 are distributed along the circumference of the exterior of the outer assembly 2-3.

[0096] Furthermore, a plurality of upper positioning pins 2-4 are provided on the upper end surface of the upper bearing seat 27 ( Figure 2-1 In the embodiment shown, two upper positioning pins 2-4 are provided. Each upper positioning pin 2-4 is a rod-shaped structure, and its lower end is connected to the upper bearing seat 27 ( Figure 10 In the embodiment shown, the lower end of the upper positioning pin 2-4 is provided with a thread, which can be screwed into an internal threaded hole at the upper end of a certain clamping optical axis 28. If the upper end of the clamping optical axis 28 is not provided with an upper positioning pin 2-4, a screw is screwed into its upper end to fix the clamping optical axis 28 to the upper bearing seat 27) and the upper end thereof is a hemispherical structure.

[0097] A lower pressing plate 2-9 coaxial with the lower bearing seat is connected to the lower portion of the lower bearing seat. The lower pressing plate 2-9 is an annular structure with an outer diameter larger than that of the lower bearing seat. A plurality of lower positioning sleeves 2-7 and a plurality of trays 2-8 are arranged below the lower pressing plate 2-9.

[0098] Specifically, the lower positioning sleeve 2-7 can adopt various existing positioning structures, for example, a stepped shaft structure with a central through hole can be adopted, the large diameter section is used to be installed and connected with the lower end surface of the lower pressure plate 2-9 by screws, and a central through hole is provided in the center of the large diameter section. The tray 2-8 can adopt various existing liquid-holding trays, for example, Figure 7The pallet shown includes a mounting block, a mounting shaft and a pallet body. The mounting shaft is located in the inner cavity of the pallet body, and the two ends of the mounting shaft are connected to the two side walls of the pallet body by screws. The mounting block is a rectangular block with two mounting holes. A downward-opening slot is provided between the two mounting holes. During installation, the mounting block is first installed on the lower end face of the lower pressure plate 2-9 by inserting screws into the mounting holes, and then the mounting shaft is pressed from bottom to top into the slot of the mounting block. The slot clamps the mounting shaft, and then the pallet body is fixed on the lower end face of the lower pressure plate 2-9.

[0099] The lower pressing plate 2-9 is provided with a plurality of through holes, each of which is provided with a guide sleeve (for example, the guide sleeve can be fixed to the lower pressing plate 2-9 by a set screw). The guide sleeve is a stepped shaft-like structure, with a guide hole formed therein. The upper portion of the guide hole is a tapered hole, into which the lower end of the sprayed tube 2-5 can be inserted. The lower end of the guide hole is connected to the tray 2-8, so that excess coating liquid in the sprayed tube 2-5 can flow into the tray 2-8 along the guide hole.

[0100] [Example 4]

[0101] The linear motion component 2 further includes a positioning plate 12 and at least two groups of positioning components, each group of positioning components includes: a connecting plate, a second guide rod 18 and a positioning adjustment sleeve 17, the second guide rod 18 is located outside the external component, the upper end of the second guide rod 18 is connected to the top plate of the frame 1, and the lower end is connected to the bottom plate of the frame 1, the positioning adjustment sleeve 17 is sleeved on the second guide rod 18, one end of the connecting plate is provided with a through hole, and the second guide rod 18 passes through the through hole, the other end of the connecting plate is fixedly connected to the positioning plate 12 by a screw, the connecting plate is located above the positioning adjustment sleeve 17, when the connecting plate moves down to the position of the positioning adjustment sleeve 17 (specifically, Figure 10 When the first polyurethane pad 23 in the middle contacts, the positioning plate 12 no longer moves down, thereby playing the role of positioning the positioning plate 12, so that there is a certain distance between the positioning plate 12 and the upper end surface of the upper bearing seat 27, and the upper positioning pin 2-4 is disengaged from the upper positioning sleeve 11.

[0102] An upper locating sleeve 11 is provided on the locating plate 12. The number of upper locating sleeves 11 is an integral multiple of the number of upper locating pins 2-4 provided on the upper bearing seat 27 (for example, two upper locating pins 2-4 are provided on the upper bearing seat 27, and six upper locating sleeves 11 are provided on the locating plate 12). Specifically, the upper locating sleeve 11 is a stepped shaft-like structure, with a large diameter section fixed to the locating plate 12 by screws, and a small diameter section engaging with a hole in the locating plate 12. A central through hole is provided on the upper locating sleeve 11, into which the upper locating pins 2-4 can be inserted. More specifically, the upper end of the central through hole of the upper locating sleeve 11 is a circular hole, and the lower end is a tapered hole. Before the upper locating pin 2-4 is inserted into the upper locating sleeve 11, the central axis of the upper locating pin 2-4 and the central axis of the matching hole of the upper locating sleeve 11 are not necessarily on the same straight line (i.e., not concentric). The tapered hole can help the upper locating pin 2-4 adjust its position and smoothly insert it into the matching hole of the upper locating sleeve 11 (i.e., concentric). The tolerance fit of the matching hole of the upper locating pin 2-4 and the upper locating sleeve 11 is a clearance fit, and the tolerance band is small. Before the sprayed tube 2-5 is inserted into the nozzle 10, the upper locating pin 2-4 is inserted into the upper locating sleeve 11 to ensure that the nozzle 10 is smoothly inserted into the inner cavity of the sprayed tube 2-5, and the deviation of the axial position of the sprayed tube 2-5 and the nozzle 10 is not large, and it is best to be concentric.

[0103] The lower end of the nozzle 10 passes through the positioning plate 12, which provides support for the nozzle, reduces deformation of the nozzle, and more importantly, ensures that the sprayed pipe is concentric with the nozzle, so that the nozzle can be smoothly inserted into the sprayed pipe. Because the relative position of the upper positioning sleeve 11 and the nozzle 10 is fixed (the lower end of the nozzle 10 passes through the positioning plate 12, and the upper positioning sleeve 11 is fixed on the positioning plate 12), the relative position of the upper positioning pin 2-4 and the sprayed pipe 2-5 is also fixed. When the upper positioning pin 2-4 is inserted into the matching hole of the upper positioning sleeve 11 (concentric), the sprayed pipe 2-5 and the nozzle 10 can basically be guaranteed to be concentric.

[0104] like Figure 10As shown, the positioning adjustment sleeve 17 includes a threaded sleeve 33, a nut 25, a stud 24, a first polyurethane pad 23, and a locking sleeve 26. Specifically, the locking sleeve 26 is mounted on the second guide rod 18, and the threaded sleeve 33 is installed above the locking sleeve 26. There is no connection between the threaded sleeve 33 and the locking sleeve 26, and the threaded sleeve 33 rests on the locking sleeve 26 due to gravity. The nut 25 is located above the threaded sleeve 33. The lower end of the stud 24 passes through the center through-hole of the nut 25 and the center through-hole of the threaded sleeve 33, and the external thread on the stud 24 mates with the internal thread of the nut 25 and the threaded sleeve 33. The first polyurethane pad 23 is located above the stud 24, and the connecting plate is located above the first polyurethane pad 23. Rotating the stud 24 can adjust the height of the stud 24 on the second guide rod 18, thereby adjusting the positioning height of the positioning plate 12. The stud 24 is then locked using the nut 25. Preferably, a process hole is provided at the lower end of the screw sleeve 33 , and a rod-shaped workpiece can be inserted into the process hole of the screw sleeve 33 before rotating the stud 24 , thereby preventing the screw sleeve 33 from rotating with the stud 24 during the rotation of the stud 24 .

[0105] Furthermore, a coaxial spring 14, a self-made nut 29, and a standard nut are provided on the positioning plate 12. Specifically, the self-made nut 29 is a two-layer stepped shaft structure. The lower end of the spring 14 contacts the upper surface of the positioning plate 12, and the upper end of the spring 14 contacts the shaft shoulder of the self-made nut 29. The small diameter section of the self-made nut 29 is located in the spring, playing a guiding role, thereby increasing the stability of the spring. The large diameter section of the self-made nut 29 is located above the spring 14. A standard nut is added above the large diameter section of the self-made nut 29 to lock the self-made nut.

[0106] A rod 15 is mounted on the upper plate. Rod 15 is a two-layer stepped shaft. Its large-diameter section is screwed to the upper plate of internal assembly 2-1. A second polyurethane pad 30 is mounted on the small-diameter section, the lower end of which contacts the shoulder of rod 15. The upper end of the small-diameter section of rod 15 is provided with an external thread. The upper end of the small-diameter section of rod 15 passes through the center hole of positioning plate 12, spring 14, custom nut 29, and standard nut in sequence, and then lies above the standard nut. The external thread on the small-diameter section of rod 15 connects with the internal threads of custom nut 29 and standard nut. The double nut provides a positioning function, allowing the position of the upper end of the spring to be adjusted using the custom nut and standard nut. The nozzle 10 is stationary. When positioning plate 12 is at its lowest point, the lower end of nozzle 10 extends below 12.

[0107] During operation, when the linear moving component 2 just moves upward, since the rod 15 is connected to the homemade nut 29 and the standard nut, and the spring 14 is sleeved on the small diameter section of the homemade nut 29, under the action of the spring 14, the lower surface of the positioning plate 12 contacts the upper surface of the second polyurethane pad 30 sleeved on the rod 15, and then the positioning plate 12 and the linear moving component 2 move upward together relatively stationary.

[0108] [Example 5]

[0109] Furthermore, two semicircular assembly grooves are provided between the two arc-shaped grooves of the mounting plate 2-6, and circular holes with the same diameter as the assembly grooves are provided on the positioning plate 12 and the lower pressing plate 2-9. The circular holes on the positioning plate 12, the circular holes on the lower pressing plate 2-9 and the corresponding assembly grooves on the mounting plate 2-6 are coaxial in the vertical direction. In this way, when installing the mounting plate 2-6, first pass a rod with equal diameter from top to bottom through the corresponding circular holes on the positioning plate 12 and the lower pressing plate 2-9, and then install the two assembly grooves of the mounting plate 2-6. The grooves are aligned with the two rods respectively and the two rods are respectively inserted into the two assembly grooves, and then the mounting plate 2-6 is fixed by screwing screws into the mounting holes of the mounting plate 2-6. In this way, the circular holes on the positioning plate 12, the circular holes on the lower pressure plate 2-9 and the assembly grooves on each mounting plate 2-6 ensure that the centers of the slots of each mounting plate from top to bottom for clamping the same sprayed pipe 2-5 are located on the same straight line, thereby ensuring that the sprayed pipe 2-5 is installed vertically, so that it can better ensure coaxiality with the nozzle 10.

[0110] [Example 6]

[0111] Further, in Figure 2-1 In the illustrated embodiment, two linear bearings 9 are provided on each first guide rod 13. The upper linear bearing 9 is screwed to the positioning plate 12, while the lower linear bearing 9 is screwed to the upper plate of the internal assembly 2-1. Both linear bearings 9 on the same first guide rod 13 can move axially on the first guide rod 13. The first guide rod 13 and linear bearings 9 are commercially available products, and the linear movement of the slider on the guide rail is similar, so no further description is given here.

[0112] [Example 7]

[0113] The linear drive assembly is connected to the internal assembly in the linear motion assembly and is used to drive the linear motion assembly to move linearly. It includes: a motor 4, a coupling 5, and a screw pair. The screw pair includes a screw 6 and a nut 16. The motor 4 is a servo motor. The servo motor is easy to control and has high positioning accuracy. In situations where the precision is not high, a variable frequency motor can also be used. In this embodiment, the servo motor 4 is connected to the screw 6 through the coupling 5, directly driving the screw 6 to rotate. In other situations, the motor can also indirectly drive the screw 6 to rotate through a belt drive, a chain drive, a gear drive, or other transmission methods. The screw 6 in this embodiment uses a ball screw. In situations where the precision is not high, a T-type screw, an ordinary threaded screw, etc. can also be used. The nut 16 is connected to the internal assembly 2-1. Specifically, the nut 16 is connected to the center of the upper plate in the inner frame of the internal assembly 2-1 through a screw. The upper end of the lead screw 6 is connected to the top plate of the frame 1 through a pair of back-to-back angular contact ball bearings, and its lower end is located in the central through hole of the connecting rod of the inner frame. The motor 4 drives the lead screw 6 to rotate, and the nut 16 moves up and down along the lead screw 6, driving the inner frame to move, and then driving the linear motion component 2 to move linearly under the guidance of the linear motion guide component.

[0114] The linear movement of the sprayed tube 2-5 is controlled by the motor 4, and the movement speed of the sprayed tube 2-5 during the spraying period is uniform to ensure uniform coating thickness. For slender sprayed tubes, the nozzle is correspondingly slender. If the sprayed tube is placed horizontally, the sprayed tube and the nozzle will produce disturbance due to their own weight, and the disturbance is large, and the position deviation between the nozzle and the axis of the circular tube is large, so the coating thickness is uneven; if the sprayed tube is placed vertically, the sprayed tube and the nozzle are not prone to disturbance, and the coating thickness is more uniform. It is easy for a sprayer to place the sprayed tube vertically, but it is difficult to do it manually. Therefore, the present invention solves the problem of uneven coating thickness.

[0115] [Embodiment 8]

[0116] The station conversion drive assembly is connected to the external assembly of the linear motion assembly and is used to drive the external assembly to rotate to meet the requirements of multiple stations. It includes: a cylinder 19, a swing arm 20 and a pin 21. One end of the swing arm 20 is connected to the piston rod of the cylinder 19, and the other end is connected to the pin 21. The pin 21 can be inserted into the lower positioning sleeve 2-7 in the linear motion assembly 2. That is, when the linear motion assembly 2 moves down to the lower positioning sleeve 2-7 and is inserted into the pin 21, the linear motion assembly 2 no longer descends. The rotation center axis of the swing arm 20 is located on the same straight line (i.e., concentric) as the rotation center axis of the bearing 2-2.

[0117] A slot is formed in the base plate, with the upper end of the pin 21 located above the slot. The lower end of the pin 21 passes through the slot and connects to one end of the swing arm 20. The pin 21 is perpendicular to the base plate and can move within the slot. The slot can be in various shapes, such as arc or rectangle, as long as it does not interfere with the movement of the pin 21. When the piston rod of the cylinder 19 is extended and the swing arm 20 rotates a certain angle, the pin 21 is inserted into the lower positioning sleeve 2-7, and the pin 21 drives the external component 2-3 to rotate by the same angle through the lower positioning sleeve 2-7 (at this time, the pin 21 drives the lower bearing seat to rotate, and the lower bearing seat drives the various retaining rings and the upper bearing seat 27 to rotate through multiple clamping optical shafts 28), thereby entering the next workstation.

[0118] Furthermore, two limit screws 22 are provided on the lower end surface of the base plate. The two limit screws 22 are respectively located at the two ends of the arc groove. The forward and reverse rotation angle positions of the swing arm 20 are limited by the two limit screws 22, so that the swing arm 20 rotates at a preset angle each time. Specifically, the swing arm 20 is an L-shaped or V-shaped structure, one end of which is fixedly connected to the lower end of the pin 21, and the other end is hinged to the piston rod. A rotating shaft is welded in the middle of the swing arm 20. The upper end of the rotating shaft is mounted on the lower end surface of the base plate through a bearing. The central axis of the rotating shaft is located on the same straight line (concentric) as the central axis of the rotation of the bearing 2-2. When the piston rod is extended, it drives the swing arm 20 to rotate along the rotating shaft by a certain angle. When the piston rod is retracted, it drives the swing arm 20 to rotate in the opposite direction by a certain angle along the rotating shaft. When the swing arm 20 hits the limit screw on one side, the swing arm 20 stops rotating. In other cases, the cylinder can also drive other position-changing mechanisms to achieve station switching, which will not be described here.

[0119] [Example 9]

[0120] In this embodiment, eight spray guns 3 are provided on the top plate (the spray guns 3 can be existing commercially available spray guns), which are divided into four groups, two in each group. Each group of spray guns 3 sprays one type of coating material, and a total of four types of coating materials are sprayed, that is, each sprayed tube 2-5 needs to be sprayed with four types of coating materials. The linear moving component 2 is provided with six workstations, that is, the external component 2-3 rotates one circle (360°) in six steps, and the external component 2-3 rotates 60° between two adjacent workstations. The 12 sprayed tubes 2-5 are arranged on the outside of the external component 2-3, divided into six groups, two in each group, and one group corresponds to one workstation. The external component 2-3 is driven by the cylinder 19 to switch the workstations. Four groups of spray guns correspond to four workstations. During spraying, the four groups of spray guns spray 8 sprayed tubes at the same time, and each workstation sprays one type of coating material. By switching the workstations, all sprayed tubes can be sprayed with four types of coating materials. Because the loading and unloading of the sprayed pipes requires a workstation, and the spray pipes that have just been sprayed with four kinds of paint need to be left to air for a period of time before being disassembled, a loading station and an airing station are set up, so there are a total of six stations, which can install 12 sprayed pipes.

[0121] This embodiment is equipped with eight spray guns, which can spray eight round tubes at the same time. If operated manually, the operator can only spray one round tube at a time. Therefore, the efficiency is eight times that of manual operation. If more spray guns are provided, the efficiency will be even higher. The number of spray guns can be determined according to the specific situation, and the arrangement of the spray guns can also be designed according to actual needs. For example, they can be evenly distributed around the circumference or evenly distributed on both sides.

[0122] [Example 10]

[0123] Furthermore, the device of the present invention may also include a counterweight 7, with a chain attached to its upper end. The other end of the chain passes through two sprockets and is fixedly connected to the upper end of the internal assembly 2-1. The two sprockets can rotate the chain 180 degrees. A chain is also attached to the lower end of the counterweight 7. The other end of the chain passes through two sprockets and is fixedly connected to the lower end of the internal assembly 2-1. The two sprockets can rotate the chain 180 degrees. The counterweight 7 is equipped with a linear bearing that allows it to move up and down along its optical axis. If the chain is not attached to the lower end of the counterweight 7, when the linear motion assembly 2 stops moving downward, the counterweight 7 will continue to move upward for a distance due to inertia. The chain at the upper end of the counterweight 7 will loosen and easily disengage from the sprockets. The chain at the lower end of the counterweight 7 will prevent the counterweight 7 from further upward movement. To account for space constraints, the weight of the counterweight 7 is one-third that of the linear motion assembly 2. Other existing counterweight structures can also be used, which will not be discussed here.

[0124] The above embodiments are developed based on the working conditions that the sprayed pipes 2-5 are slender and have poor rigidity, and the difference between the inner diameter of the sprayed pipes 2-5 and the outer diameter of the nozzle 10 is very small. If the sprayed pipes are not slender, the difference between the inner diameter of the sprayed pipes and the outer diameter of the nozzle is not very small, and the rigidity of the sprayed pipes and the nozzle is good, then the structure of the sprayer of the present invention can be greatly simplified, such as Figure 5 As shown, the upper positioning sleeve 11, the positioning plate 12, the spring 14, the rod 15, the positioning adjustment sleeve 17, the second guide rod 18, the upper positioning pins 2-4, and the counterweight 7 can be unnecessary.

[0125] The above embodiment is a vertical structure, that is, the sprayed pipes 2-5 and the nozzle 10 are placed vertically. If the sprayed pipes and the nozzle have good rigidity, the sprayer can also be a horizontal structure, that is, the sprayed pipes and the nozzle are placed horizontally. The specific structure is to place the sprayed pipes 2-5 and the nozzle 10 horizontally. Figure 5 Just set it in horizontal orientation.

[0126] The electric control box 8 can be any of the existing electric control boxes that can realize electrical appliance control, and will not be described in detail here.

[0127] The spraying machine provided by the present invention has a compact structure and a reasonable layout.

[0128] The method for spraying tubular membranes using the tubular membrane spraying machine is as follows:

[0129] (1) Fix the sprayed tube 2-5 on each mounting plate 2-6;

[0130] (2) After the clamping is completed, the piston rod of the cylinder 19 extends, driving the swing arm 20 to rotate the set angle (for example, 60 degrees), and the external component 2-3 rotates the set angle (for example, 60 degrees) and enters the next station;

[0131] (3) The motor 4 drives the lead screw 6 to rotate, and the linear motion component 2 moves upward under the guidance of the linear motion guide component. During the upward movement, the upper positioning pin 2-4 is partially inserted into the upper positioning sleeve 11 set on the positioning plate 12, and the lower positioning sleeve 2-7 is completely separated from the pin shaft 21. The upper positioning pin 2-4 is then fully inserted into the upper positioning sleeve 11, and the nozzle 10 extends into the inner cavity of the sprayed tube 2-5. The upper surface of the second polyurethane pad 30 installed on the rod 15 contacts the lower surface of the positioning plate 12. Under the buffering force of the spring 14, the linear motion component 2 pushes the positioning plate 12 to move upward together. After moving into place, it stops moving upward, as shown in FIG. Figure 9 As shown, at this time, the bottom of the sprayed tube 2-5 is close to the end of the nozzle 10;

[0132] (4) The piston rod of the air cylinder 19 retracts. The spray gun 3 starts spraying, and the linear motion assembly 2 and the positioning plate 12 move downward at a set speed until the connecting plate connected to the positioning plate 12 contacts the first polyurethane pad 23, and the positioning plate 12 stops moving. At this time, the spray gun 3 is turned off and spraying stops;

[0133] (5) The linear motion component 2 continues to move downward, and the buffer provided at the bottom of the internal component 2-1 touches the bottom plate of the frame 1. The lower positioning sleeve 2-7 is partially inserted into the pin 21. After the upper positioning pin 2-4 is completely separated from the upper positioning sleeve 11, the lower positioning sleeve 2-7 is completely inserted into the pin 21. At this time, the linear motion component 2 stops moving;

[0134] (6) After loading ("loading" means removing the sprayed tube and inserting a new sprayed tube 2-5), the cylinder 19 drives the outer component 2-3 to rotate and enter the next station, and then returns to step (3).

[0135] The operation of the sprayer of the present invention can be controlled by an operator in the electric control box 8 .

[0136] In the description of the present invention, it should be noted that, unless otherwise specified or limited, the terms "connected" and "connection" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integral connection; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediary. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0137] In the description of the present invention, unless otherwise specified, the terms "upper", "lower", "left", "right", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operate in a specific direction. Therefore, they cannot be understood as limiting the present invention.

[0138] Finally, it should be noted that the above technical solution is only one embodiment of the present invention. For those skilled in the art, it is easy to make various types of improvements or modifications based on the application methods and principles disclosed in the present invention, and it is not limited to the method described in the above specific embodiment of the present invention. Therefore, the method described above is only preferred and does not have a restrictive meaning.

Claims

1. A tubular film spraying machine, characterized in that: The tubular film spraying machine comprises: a frame and a linear motion guide assembly, a linear motion assembly, a linear drive assembly and a station conversion assembly arranged thereon; The frame includes a top plate and a bottom plate; the top plate is located above the bottom plate, and the top plate is parallel to the bottom plate, and the top plate and the bottom plate are connected by columns; The linear motion assembly includes an internal assembly, a bearing, and an external assembly; The linear drive assembly is capable of driving the linear motion assembly to move along the linear motion guide assembly; The workstation conversion assembly is capable of driving the external assembly in the linear motion assembly to rotate; The internal components include: an inner frame, the inner frame including an upper plate, a connecting rod, and a lower plate arranged coaxially; the upper end of the connecting rod is connected to the upper plate, and the lower end is connected to the lower plate; the upper plate and the lower plate are both disc-shaped structures, and have a central through hole coaxially therewith; the inner rings of the two bearings are connected to the upper plate and the lower plate respectively; The external component includes: an upper bearing seat, a lower bearing seat, and a plurality of clamping optical shafts installed between the upper bearing seat and the lower bearing seat; the upper bearing seat is located at the top and connected to the bearing outer ring of the upper bearing; the lower bearing seat is located at the bottom and connected to the bearing outer ring of the lower bearing; the upper end of each clamping optical shaft is connected to the upper bearing seat, and the lower end is connected to the lower bearing seat; A lower pressure plate coaxial with the lower bearing seat is connected to the lower part of the lower bearing seat; A plurality of lower positioning sleeves are provided below the lower pressing plate; The work station conversion assembly includes: a cylinder, a swing arm and a pin; one end of the swing arm is connected to the piston rod of the cylinder, and the other end is connected to the pin; a groove is opened on the base plate, and the upper end of the pin can be inserted into the lower positioning sleeve after passing through the groove; two limit screws are provided on the lower end surface of the base plate, and the two limit screws are respectively located at both ends of the groove.

2. The tubular film spraying machine according to claim 1, characterized in that: The linear drive assembly and the spray gun are arranged on the top plate; the spray gun is connected to a nozzle; The workstation conversion assembly is arranged on the bottom plate; A plurality of linear motion guide components are arranged between the top plate and the bottom plate.

3. The tubular film spraying machine according to claim 2, characterized in that: The linear motion guide assembly includes a plurality of first guide rods and linear bearings; The upper end of each first guide rod is connected to the top plate, and the lower end is connected to the bottom plate; A plurality of linear bearings are provided on each first guide rod; Or the linear motion guide assembly includes a plurality of guide rails and sliders; The upper end of each guide rail is connected to the top plate, and the lower end is connected to the bottom plate; A plurality of sliders are arranged on each guide rail.

4. The tubular film spraying machine according to claim 3, characterized in that: A buffer is installed on the lower plate; The upper plate is connected to a linear bearing or a slider.

5. The tubular film spraying machine according to claim 4, characterized in that: The central axis of each clamping optical axis is parallel to the central axis of the inner frame.

6. The tubular film spraying machine according to claim 5, characterized in that: A multi-layered clamping ring coaxial with the upper bearing seat and the lower bearing seat is provided between the upper bearing seat and the lower bearing seat; A plurality of holes are opened on each layer of the clamping ring, and each hole of each layer of the clamping ring is sleeved on each clamping optical axis; A plurality of spacers are sleeved on each clamping optical axis, and each spacer is located between two adjacent clamping rings; Each layer of the clamping ring is an annular structure, and a plurality of clamping plates are provided on the circumferential edge of each layer of the clamping ring; Each of the clamping plates is a sheet-like structure, one side of which is connected to the clamping ring, and the edge of the other side of which is provided with two clamping grooves, into which the sprayed tube can be clamped; Two semicircular assembly grooves are arranged between the two clamping grooves.

7. The tubular film spraying machine according to claim 6, characterized in that: A plurality of upper positioning pins are provided on the upper end surface of the upper bearing seat, each of which is a rod-shaped structure, the lower end of which is connected to the upper bearing seat, and the upper end of which is a hemispherical structure; A plurality of trays are provided below the lower pressing plate; A plurality of through holes are provided on the lower pressing plate, a flow guide sleeve is provided in each through hole, a flow guide hole is provided in the flow guide sleeve, and the flow guide hole is communicated with the tray.

8. The tubular film spraying machine according to claim 7, characterized in that: The linear motion assembly further includes a positioning plate and at least two sets of positioning assemblies; each set of positioning assemblies includes: a connecting plate, a second guide rod and a positioning adjustment sleeve; The second guide rod is located outside the external component, the upper end of the second guide rod is connected to the top plate, and the lower end is connected to the bottom plate; the positioning adjustment sleeve is sleeved on the second guide rod; One end of the connecting plate is provided with a through hole, and the second guide rod passes through the through hole; the other end of the connecting plate is fixedly connected to the positioning plate; The connecting plate is located above the positioning and adjusting sleeve; An upper positioning sleeve is provided on the positioning plate, and a central through hole is formed on the upper positioning sleeve, into which the upper positioning pin can be inserted; the number of the upper positioning sleeves is an integer multiple of the number of the upper positioning pins; The lower end of the nozzle passes through the positioning plate; The positioning plate is connected to a linear bearing or a slider, and the linear bearing or the slider is located above the linear bearing or the slider connected to the upper plate; Circular holes with the same diameter as the assembly groove on the clamping plate are provided on the positioning plate and the lower pressing plate. The circular holes on the positioning plate, the circular holes on the lower pressing plate and the corresponding assembly groove on the clamping plate are coaxial in the vertical direction.

9. The tubular film spraying machine according to claim 8, characterized in that: The linear drive assembly includes: a motor, a coupling, and a screw pair; the screw pair includes a screw and a nut; the upper end of the screw is connected to the top plate through a bearing, and the lower end is located in the central through hole of the connecting rod; the nut is connected to the center of the upper plate.

10. A tubular membrane spraying method, characterized in that: The method is implemented using the tubular film spraying machine according to claim 9, and the method comprises: (1) Fix the sprayed tube on each mounting plate; (2) The cylinder drives the external component to rotate to the set angle and enter the next station; (3) The motor drives the lead screw to rotate, the linear moving assembly moves upward, the nozzle extends into the inner cavity of the sprayed tube, and the linear moving assembly pushes the positioning plate to move upward together. After moving into position, it stops moving upward. At this time, the bottom of the sprayed tube is close to the end of the nozzle; (4) The piston rod of the cylinder retracts, the spray gun starts to spray, and at the same time the linear motion assembly and the positioning plate move downward at a set speed until the positioning plate stops moving. At this time, the spray gun is closed and spraying stops; (5) The linear moving assembly continues to move downward, and after the lower positioning sleeve is inserted into the pin shaft, the linear moving assembly stops moving; (6) After loading is completed, the cylinder drives the external component to rotate the set angle, enter the next station, and then return to step (3).

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