A U-shaped lamp tube coating machine

Abstract

The present invention belongs to the technical field of processing of energy-saving lamp tubes, and discloses a U-shaped lamp tube coating machine, including a frame, on which a transmission mechanism, an upper tube device, a coating assembly, a film liquid drying device, and a lower tube device are installed; the transmission mechanism includes a station clamp; a flip station is respectively provided behind the upper tube station and in front of the lower tube station, and the station clamp realizes a 180-degree flip at the flip station through a first push rod, a first stop pin, a second push rod, and a second stop pin matching structure; the coating assembly includes an injection and suction assembly; the injection and suction assembly includes a liquid injection pipe and a liquid suction pipe arranged side by side, and the liquid injection pipe and the liquid suction pipe rise and fall with the injection and suction lifting seat, and the liquid injection and liquid suction are completed by connecting a liquid injection pump and a liquid suction pump. The upper tube device and the liquid injection and liquid suction mechanism of the present invention have a more streamlined structure; the coating accuracy of the injection and suction assembly is high; the synchronization of the actions of each device is good; and the probability of the lamp tube falling off is low.

Description

Technical Field

[0001] The invention belongs to the technical field of energy-saving lamp processing, relates to the coating technology of energy-saving lamp tubes, and particularly relates to a U-shaped energy-saving lamp tube coating device. Background Art

[0002] In the production process of energy-saving lamp tubes, a layer of aluminum oxide or titanium oxide protective film is first applied to the inner wall of the glass tube before the fluorescent powder is applied. This can effectively prevent mercury from reacting with the sodium element in the tube, reduce the consumption of mercury, and better fix the fluorescent powder. Since the tube mouth of the energy-saving lamp tube needs to be welded and sealed in the subsequent processing, the inner wall near the tube mouth is prohibited from being coated. Otherwise, the tube mouth will be unable to be sealed due to the isolation effect of the protective film.

[0003] Patent publication number CN103903936A discloses an energy-saving lamp tube coating machine, which can complete the coating process of the inner wall of the energy-saving lamp tube in a highly automated manner. However, its defects are: 1. During the operation of the upper tube device, the tube clamp has a large-scale flipping action and emergency stop action, and the lamp tube is easy to fall off due to vibration (the lamp tube cannot be clamped too tightly, otherwise the lamp tube is easy to be crushed); 2. During the liquid injection process, the membrane liquid will splash water when it hits the liquid surface in the lamp tube. On the one hand, droplets will splash onto the tube wall uncontrollably. Droplets splashed onto the parts of the tube mouth where film coating is prohibited will cause occasional air leakage to the subsequent sealing treatment of the tube mouth. On the other hand, due to the impact of the membrane liquid, the liquid level in the lamp tube will fluctuate greatly, resulting in a transition section of the tube wall with a severely uneven boundary between the coated tube wall and the non-coated tube mouth. On this transition section of the tube wall, some parts are coated with a protective film, and some parts are not coated with a protective film. If the transition section of the tube wall is used as a part of the tube mouth that needs to be sealed, it will cause occasional air leakage to the subsequent tube mouth sealing treatment. If the transition section of the tube wall is used as a part of the light-transmitting tube body of the lamp tube, the energy-saving lamp is easy to turn black near the tube mouth during use. 3. The annular transmission mechanism is equipped with a liquid injection mechanism and two liquid extraction mechanisms, and the equipment is complicated; the power source of multiple devices is the cylinder. If there is no electronic detection and control link, it will produce continuous cumulative deviations after working for a long time, and the movement synchronization is poor. Summary of the invention

[0004] The purpose of the present invention is to overcome the above-mentioned defects and provide an improved U-shaped lamp tube coating machine.

[0005] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a U-shaped lamp tube coating machine, comprising a frame, on which is mounted an annular clamping and conveying mechanism for conveying the U-shaped lamp tube during the coating process, an upper tube device, a coating assembly, a film liquid drying device, and a lower tube device are sequentially arranged around the annular clamping and conveying mechanism along the lamp tube conveying path; the annular clamping and conveying mechanism comprises an annular conveying chain mechanism and a plurality of station clamps for clamping the U-shaped lamp tube evenly arranged on the conveying chain of the annular conveying chain mechanism,

[0006] It is characterized in that

[0007] The upper tube device is packaged with an upper tube slide rail, and the U-shaped lamp tube is hung on the upper tube slide rail with the tube mouth facing downward and slides from the high end to the low end, and the low end of the upper tube slide rail is directly or indirectly connected with the station clamp without contact;

[0008] The lower tube device comprises a lower tube slide rail, on which the U-shaped lamp tube is hung with its tube opening facing downward and slides from the high end to the low end, and the high end of the lower tube slide rail is directly or indirectly connected with the station clamp without contact.

[0009] The coating machine of the present invention is provided with a flipping station behind the upper tube station (with the lamp tube transmission direction as a reference) and in front of the lower tube station, respectively. The station clamp is rotatably mounted on the station clamp mounting seat through a rotating shaft, the station clamp mounting seat is fixed to the transmission chain, a pair of flat grooves are provided on the rotating shaft, and a pair of spring sheets are provided on the station clamp mounting seat, and the pair of spring sheets are elastically pressed against the pair of flat grooves on the rotating shaft. A first push rod and a second push rod are provided above and below the station clamp, respectively, and a first stop pin for blocking the first push rod and a second stop pin for blocking the second push rod are provided at the flipping station and are fixed relatively to the frame.

[0010] The above structure realizes the automatic 180-degree flipping of the station clamp when passing through the flipping station through the cooperation of the push rod and the stop pin, the flat groove and the spring sheet, thereby realizing the change of the tube mouth direction of the lamp tube on the station clamp. This translation method has at least the following advantages: 1. The flipping is realized by the station clamp rotating along the rotating shaft, and the lamp tube does not have a large swing during the process; 2. The second half of the flipping of the station clamp and the limitation of the flipping angle are realized through the cooperation structure of the flat groove and the spring sheet. The elasticity of the spring sheet not only makes the flipping process gentle, but also allows the station clamp to exceed 180 degrees based on inertia when flipping, and then return 180 degrees, making the stopping process of the flipping action gentle. Not only can the flipping of the lamp tube be realized through four simple parts, but more importantly, it effectively prevents the lamp tube from falling off due to vibration.

[0011] The coating assembly includes a liquid storage barrel, a liquid injection pump, a liquid extraction pump, and an injection and suction assembly. The liquid inlet end of the liquid injection pump is connected to the liquid storage barrel through a hose, and the liquid outlet end of the liquid extraction pump is connected to the liquid storage barrel through a hose. The injection and suction assembly includes an injection pipe and a liquid suction pipe arranged side by side, an injection and suction lifting seat for fixing the injection pipe and the liquid suction pipe, and an injection and suction assembly mounting plate for mounting the injection and suction lifting seat. The injection and suction lifting seat can be lifted and lowered on the injection and suction assembly mounting plate through a vertical guide rail mechanism, and the injection and suction assembly mounting plate is fixed to the frame. The distance between the liquid injection pipe and the liquid suction pipe is equal to the distance between the two straight tubes of the U-shaped lamp tube. The upper end of the liquid injection pipe is directly or indirectly connected to the liquid outlet end of the liquid injection pump, the upper end of the liquid suction pipe is directly or indirectly connected to the liquid inlet end of the liquid extraction pump, and the lower end of the liquid suction pipe is connected to a section of soft rubber hose.

[0012] In the injection and suction assembly of the present invention, the injection tube and the suction tube are synchronously lifted and lowered with the injection and suction lifting seat. When injection is required, the injection tube and the suction tube are respectively inserted downward into the two tube openings of the U-shaped lamp tube. When injecting liquid, the liquid level in the tube submerges the lower tube opening of the injection tube, and the liquid level in the tube rises steadily until the required injection amount is reached and stops, and then the suction pump is started to suck the film liquid back. During the whole process, except before the liquid level in the tube submerges the lower tube opening of the injection tube, the rest of the process will not cause film liquid splashing, violent fluctuations in the liquid level, etc. In addition, after the entire process of injection and suction is completed, the lamp tube will be transmitted backwards after the injection and suction assembly rises, which overcomes the problem in the prior art that when the film liquid is transmitted in the lamp tube, the shaking of the liquid level causes the film liquid to stick to the tube wall where the film is not desired to be coated.

[0013] Further, the injection and suction lifting seat is hinged to the upper end of an injection and suction assembly connecting rod, and the lower end of the injection and suction assembly connecting rod is hinged to the swing end of an injection and suction driving swing rod. The injection and suction driving swing rod is a single-arm swing rod, the swing axis is located at the other end of the swing rod, and the middle part of the swing rod is pressed against an injection and suction driving cam, and the injection and suction driving cam is installed on a main shaft, and the main shaft is driven to rotate by a motor, and the injection and suction driving cam drives the injection and suction driving swing rod to swing, and the injection and suction driving swing rod drives the injection and suction lifting seat to rise and fall through the injection and suction assembly connecting rod.

[0014] As an improvement, the coating assembly also includes a secondary suction component, which is used to suck a small amount of residual film liquid that slowly flows down from the pipe arm after the film is coated by the injection and suction component. The secondary suction component includes a liquid suction pipe, a suction lifting seat for fixing and installing the liquid suction pipe, and a suction component mounting plate for mounting the suction lifting seat. The suction lifting seat is escalably mounted on the suction component mounting plate through a vertical guide rail mechanism, and the suction component mounting plate is fixed to the frame. The upper end of the liquid suction pipe is directly or indirectly connected to the liquid inlet end of the liquid pump, and the lower end of the liquid suction pipe is connected to a section of soft rubber hose.

[0015] Furthermore, the suction lifting seat is hinged to the upper end of a suction assembly connecting rod, and the lower end of the suction assembly connecting rod is hinged to the swing end of a suction drive swing rod. The suction drive swing rod is a single-arm swing rod, the swing axis is located at the other end of the swing rod, and the middle part of the swing rod is pressed against a suction drive cam. The suction drive cam is installed on a main shaft, and the main shaft is driven to rotate by a motor. The suction drive cam drives the suction drive swing rod to swing, and the suction drive swing rod drives the suction lifting seat to rise and fall through the suction assembly connecting rod.

[0016] As an improvement, the coating assembly further includes a pressing device, which includes a slide bar seat horizontally mounted on the frame and a horizontal slide bar slidably mounted on the slide bar seat. A rubber pressing block is fixed to one end of the horizontal slide bar close to the station clamp, and the other end is hinged to a connecting rod of the pressing device providing linear drive. The pressing device presses the lamp tube during liquid injection to prevent the lamp tube from falling off the station clamp under the impact of the film liquid during liquid injection.

[0017] Furthermore, the membrane liquid drying device includes a heating tube installed above the conveying link, fixed by a frame, and equipped with an electric furnace wire; the heating tube is connected to a long square hot air tube; there are two square hot air tubes, which are respectively arranged on both sides of the frame; the square hot air tube is provided with a plurality of hot air nozzles with openings facing downwards; the hot air nozzles are arranged corresponding to the workstation clamps.

[0018] Furthermore, the coating machine of the present invention also includes a synchronous driving mechanism for synchronously driving the action parts in the upper tube device, the injection and suction assembly, the top pressure device, and the lower tube device. The synchronous driving mechanism is installed at the lower part of the frame, and includes a motor, a main shaft, a series of cams installed on the main shaft, and a series of rocker mechanisms and connecting rods corresponding to the cams. The connecting rods are respectively connected to the lifting parts in the upper tube device, the lifting parts in the injection and suction assembly and the suction assembly, the sliding parts in the top pressure device, and the lifting parts in the lower tube device. The designed cam-lever mechanism can periodically output the vertical motion driving force required by each device through the connecting rod.

[0019] The beneficial effects of the present invention are as follows: compared with similar inventions disclosed previously, the structure of the tube-loading device and the liquid injection and suction mechanism is more streamlined and the maintenance cost is lower; the coating accuracy of the newly proposed injection and suction assembly is greatly improved; the power source of most devices is the same motor and the same main shaft driven by a mechanical structure, and the working actions of each device are more identical; the tube-loading process of the lamp tube has one less handover process, and the flipping action amplitude is also smaller, so that the lamp tube shedding rate is lower. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is an overall schematic diagram of the U-shaped lamp tube coating machine of the present invention.

[0021] Figure 2It is a schematic structural diagram of the tube upper device of the U-shaped lamp tube coating machine of the present invention.

[0022] Figure 3 for Figure 2 A schematic diagram of the partial structure of the upper tube device shown.

[0023] Figure 4 It is a schematic diagram of the station clamp structure in the transmission mechanism of the present invention.

[0024] Figure 5 A schematic structural diagram of another angle of the workstation clamp in the conveying mechanism of the present invention.

[0025] Figure 6 Schematic diagram of the position relationship between the work station clamp and the stop pin.

[0026] Figure 7 This is a schematic diagram of the workstation clamp mounting base structure.

[0027] Figure 8 A schematic diagram of a workstation clamp structure of another optional solution.

[0028] Fig. 9 It is a schematic structural diagram of the top pressing device described in the present invention.

[0029] Fig.10 It is a schematic diagram of the structure of the injection and suction components in the coating assembly of the present invention.

[0030] Fig.11 It is a schematic diagram of the structure of the synchronous drive mechanism of the present invention.

[0031] S: upper tube device; Y: top pressure device; M: injection and suction assembly; 22: driving sprocket; 23: driven sprocket; 24: transmission chain; 25: linear chain groove; H: drying device; X: lower tube device; D: synchronous drive mechanism;

[0032] 101: upper tube swing arm; k1: connection hole; 102: upper tube lifting assembly; 11: intersection support plate; 12: upper tube slide rail; E: station clamp;

[0033] 1: workstation clamp (without mounting base); 2: workstation clamp jaws; 3: workstation clamp mounting base; 4: spring sheet; 5: spring; 6: push rod; 6.1: first push rod at the bottom; 6.2: second push rod at the bottom; 6.3: first push rod at the top; 6.4: second push rod at the bottom; 7: workstation clamp shaft; 9: stop pin; 9.1: first stop pin; 9.2: second stop pin; a: groove; b: flat groove; 10: spring sheet mounting rod;

[0034] 301: top-pressing rubber block; 302: top-pressing front seat; 303: slide rod seat; 304: slide rod; 305: joint bearing; 306: connecting rod; 307: fixing seat; 308: driving lever; 309: lever mounting seat; k3: connecting hole;

[0035] 401: Part of the frame; 402: Mounting plate of injection and suction assembly; 403: Injection and suction lifting tube seat; 404: Injection pump; 405: Liquid tube clamping seat; 406: Injection tube; 407: Suction tube; 408: Soft rubber hose. DETAILED DESCRIPTION

[0036] The U-shaped lamp tube coating machine of the present invention is described in detail below with reference to the accompanying drawings.

[0037] like Figure 1 and Figure 4 As shown, the U-shaped lamp tube coating machine of the present invention is mainly composed of an annular clamping and conveying mechanism, an upper tube device S, a coating assembly, a drying device H, a lower tube device X, and a synchronous driving mechanism D. The annular clamping and conveying mechanism is composed of an annular conveying chain mechanism and a plurality of station clamps E for clamping the U-shaped lamp tube that are evenly arranged on the conveying chain of the annular conveying chain mechanism. The annular conveying chain mechanism includes a driving sprocket 22, a driven sprocket 23, a conveying chain 24, and two straight chain grooves 25. The driving sprocket 22, the driven sprocket 23 and the chain groove 25 are all horizontally installed on the frame through a support body; the conveying chain 24 is arranged around the driving sprocket 22 and the driven sprocket 23 to form a horizontal ring, the chain groove 25 is opened to the outside, and the two straight sections of the conveying chain 24 are respectively located in the two chain grooves 25; a plurality of station clamp mounting seats 3 are evenly installed on the conveying chain 24, and a station clamp 1 is installed on each station clamp mounting seat 3.

[0038] The wire-circuit annular conveying mechanism is respectively provided with a tube-up station, a first turning station, a liquid injection and suction station, a secondary suction station, a drying station and a tube-down station.

[0039] The pipe-loading station is provided with a pipe-loading device S, which includes a pipe-loading base, a pipe-loading slide rail assembly and a cross-connection support assembly installed on the pipe-loading base.

[0040] like Figure 2 and Figure 3 As shown, the upper tube slide rail assembly includes an upper tube slide rail 12 for hanging an inverted U-shaped lamp tube, two upper tube lifting assemblies, two blocking protrusions are provided on the upper tube slide rail, and two upper tube lifting assemblies 102 are respectively arranged below the two blocking protrusions. The upper tube lifting assembly includes an upper tube lifting rod vertically slidably arranged on the upper tube base and a lifting block fixed to the upper end of the upper tube lifting rod, and the lifting block includes a lifting plane in contact with the lower end of the lamp tube and a docking vertical surface for the lower end of the lamp tube to dock. The lower end of the upper tube lifting rod is pressed against an upper tube swing arm 101 and is connected to the upper tube swing wall through a tension spring. The upper tube swing arm 101 is swingably arranged at the bottom of the upper tube base.

[0041] The intersection support assembly includes an intersection lifting rod and an intersection support plate 11 disposed at the upper end of the intersection lifting rod and non-contactingly connected with one end of the upper tube slide rail near the station clamp, the intersection lifting rod is vertically slidably disposed on the upper tube base, and the lower end of the intersection lifting rod is pressed against the upper tube swing arm 101. The upper tube swing arm is hinged to the upper end of the upper tube device connecting rod.

[0042] like Figure 4 , Figure 5 , Figure 6 , Figure 7 As shown, the work station clamp 1 has a groove a and a clamping claw 2 that fits the shape of the lamp tube. The rear side of the work station clamp 1 has a cylinder fixed to the frame, which can push the clamping claw 2 of the work station clamp to open and close. The work station clamp 1 is rotatably mounted on the work station clamp mounting seat 3 through a rotating shaft 7. The work station clamp mounting seat 2 is fixed to the conveying chain 24. A pair of flat grooves b is provided on the rotating shaft, and a pair of spring sheets 4 are provided on the work station clamp mounting seat. The pair of spring sheets are elastically pressed against a pair of flat grooves b on the rotating shaft, so that the work station clamp 1 automatically returns to the horizontal after rotation. A first push rod 6.1 and a second push rod 6.2 are respectively provided above and below the work station clamp. A first stop pin 9.1 for blocking the first push rod 6.1 and a second stop pin 9.2 for blocking the second push rod 6.2 are fixed relative to the frame at the flipping station. An alternative solution is to set the push rod 6 to the rotating shaft 7 of the work station clamp, such as Figure 8 As shown, this can avoid the situation where the workstation clamp body may collide with the stop pin 9 during the flipping process.

[0043] The liquid injection and suction station is provided with two groups of injection and suction components M and a top pressing device Y.

[0044] like Fig. 9 As shown, the pressing device Y comprises a slide bar seat 307 horizontally mounted on the frame and a horizontal slide bar 304 slidably mounted on the slide bar seat. A rubber pressing block 301 is fixed to one end of the horizontal slide bar 304 close to the station clamp, and the other end is hinged to a pressing device connecting rod 308 providing linear drive.

[0045] like Fig.10 As shown, the injection and suction assembly M includes an injection and suction assembly mounting plate 402 installed on a frame 401 and provided with a vertical slide rail, an injection and suction lifting seat 403 installed on the slide rail, and an injection pipe 406 and a suction pipe 407 fixed on the injection and suction lifting seat. The injection and suction lifting seat 403 is hinged at the upper end of an injection and suction assembly connecting rod 409 arranged in the vertical direction, and the connecting rod provides the power for sliding up and down. The upper end of the injection pipe is connected to the liquid storage barrel through a hose, and an injection pump 404 is arranged between the two. The upper end of the suction pipe is connected to the liquid extraction pump through a hose, and the liquid extraction pump is connected to the liquid storage barrel. The lower end of the suction pipe is connected to a section of soft rubber hose 408. The injection pipe and the suction pipe are arranged side by side vertically, and are respectively aligned with the two pipe openings of a lamp tube.

[0046] The secondary suction station is provided with a secondary suction assembly, which includes a liquid suction pipe, a suction lifting seat for fixing and installing the liquid suction pipe, and a suction assembly mounting plate for mounting the suction lifting seat. The suction lifting seat is escalably mounted on the suction assembly mounting plate through a vertical guide rail mechanism, and the suction assembly mounting plate is fixed to the frame. The upper end of the liquid suction pipe is directly or indirectly connected to the liquid inlet end of the liquid pump, and the lower end of the liquid suction pipe is connected to a section of soft rubber hose.

[0047] The drying station is provided with a membrane liquid drying device H, which includes a heating tube installed above the conveying link, fixed by a frame, and equipped with an electric furnace wire; the heating tube is connected to a long square hot air tube; there are two square hot air tubes, which are respectively arranged on both sides of the frame; a plurality of hot air nozzles with openings facing downwards are arranged on the hot air square tube; the hot air nozzles are arranged corresponding to the station clamps.

[0048] The down-tube station is provided with a down-tube device, which includes a down-tube base, a down-tube slide rail assembly installed on the down-tube base, and a cross-support assembly for the down-tube, the down-tube slide rail assembly includes a down-tube slide rail for hanging an inverted U-shaped lamp tube, and a down-tube lifting assembly, a blocking protrusion is provided on the down-tube slide rail, and the down-tube lifting assembly is arranged below the blocking protrusion, the down-tube lifting assembly includes a down-tube lifting rod vertically slidingly arranged on the down-tube base and a lifting block fixed at the upper end of the down-tube lifting rod, the lifting block includes a lifting plane in contact with the lower end of the lamp tube and a docking vertical surface for the lower end of the lamp tube to dock. The lower end of the down-tube lifting rod is pressed against a down-tube swing arm, and is connected to the down-tube swing wall through a tension spring, and the down-tube swing arm 101 is swingably arranged at the bottom of the upper tube base. The intersection support assembly includes an intersection lifting rod and an intersection support plate arranged at the upper end of the intersection lifting rod and non-contactingly connected with one end of the lower tube slide rail close to the station clamp, the intersection lifting rod is vertically slidably arranged on the lower tube base, and the lower end of the intersection lifting rod is pressed against the lower tube swing arm. The lower tube swing arm is hinged to the upper end of the lower tube device connecting rod.

[0049] Preferably, each station clamp of the present invention can clamp two U-shaped lamp tubes, and the matching upper tube device, top pressure device, liquid injection and extraction mechanism and lower tube device are all arranged in a pair. In this way, the production efficiency of the coating machine is doubled.

[0050] like Fig.11 As shown, the synchronous drive mechanism is installed below the complete coating equipment described in the present invention, and includes a motor 501, a main shaft 502 connected to the output end of the motor, a first cam 503, a second cam 504, a third cam 505, a first rocker arm 506, a second rocker arm 308, a third rocker arm 507, and a fourth rocker arm installed on the main shaft, and a fourth cam.

[0051] The first swing rod 506 is a linear swing rod, the swing axis is located in the middle of the swing rod, the first swing arm of the first swing rod abuts against the first cam, the second swing arm of the first swing rod is hinged to the lower end of the upper tube device connecting rod 510, and the upper end of the upper tube device connecting rod 510 is hinged to the upper tube swing arm 101;

[0052] The second swing rod 308 is a bent L-shaped swing rod, the swing axis is located at the corner of the swing rod, the first swing arm of the second swing rod abuts against the second cam, and the upper end of the second swing arm of the second swing rod is hinged to the connecting rod of the top pressing device;

[0053] The third swing rod 507 is a linear swing rod, the swing axis is located at the first end of the swing rod, the middle part of the third swing rod abuts against the third cam, the second end of the third swing rod is hinged to the lower end of the injection and suction assembly connecting rod 409, and the upper end of the injection and suction assembly connecting rod 409 is hinged to the injection and suction lifting seat 403, that is, the shaft holes k1 and k2 are coaxially matched and hinged;

[0054] The fourth swing rod is a linear swing rod, the swing axis is located in the middle of the swing rod, the first swing arm of the fourth swing rod abuts against the fourth cam, the second swing arm of the fourth swing rod is hinged to the lower end of the lower tube device connecting rod, and the upper end of the lower tube device connecting rod is hinged to the lower tube swing arm;

[0055] The designed cam-linkage mechanism can periodically output the vertical motion driving force required by each device through the connecting rod.

[0056] It can be imagined that the above description is not a limitation of the present invention, and the present invention is not limited to the above examples. Changes, modifications, additions or substitutions made by ordinary technicians in this technical field within the scope of the present invention should all fall within the protection scope of the present invention.

Claims

1. A U-shaped lamp tube coating machine, comprising a frame, on which is mounted an annular clamping and conveying mechanism for conveying the U-shaped lamp tube during the coating process, an upper tube device, a coating assembly, a film liquid drying device, and a lower tube device are sequentially arranged around the annular clamping and conveying mechanism along the lamp tube conveying path; the annular clamping and conveying mechanism comprises an annular conveying chain mechanism and a plurality of station clamps for clamping the U-shaped lamp tube uniformly arranged on the conveying chain of the annular conveying chain mechanism; characterized in that, The upper tube device is packaged with an upper tube slide rail, and the U-shaped lamp tube is hung on the upper tube slide rail with the tube mouth facing downward and slides from the high end to the low end, and the low end of the upper tube slide rail is directly or indirectly connected with the station clamp without contact; The lower tube device comprises a lower tube slide rail, the U-shaped lamp tube is hung on the lower tube slide rail with the tube opening facing downwards and slides from the high end to the low end, and the high end of the lower tube slide rail is directly or indirectly connected with the station clamp without contact; A flipping station is respectively provided behind the upper tube station and in front of the lower tube station, the station clamp is rotatably mounted on the station clamp mounting seat through a rotating shaft, the station clamp mounting seat is fixed to the conveying chain, a pair of flat grooves are provided on the rotating shaft, a pair of spring sheets are provided on the station clamp mounting seat, and the pair of spring sheets are elastically pressed against the pair of flat grooves on the rotating shaft; a first push rod and a second push rod are respectively provided above and below the station clamp, and a first stop pin for blocking the first push rod and a second stop pin for blocking the second push rod are provided at the flipping station and are relatively fixed to the frame; The coating assembly includes a liquid storage barrel, a liquid injection pump, a liquid extraction pump, and an injection and suction assembly; the liquid inlet end of the liquid injection pump is connected to the liquid storage barrel through a hose, and the liquid outlet end of the liquid extraction pump is connected to the liquid storage barrel through a hose; The injection and suction assembly comprises an injection pipe and a suction pipe arranged side by side, an injection and suction lifting seat for fixing and installing the injection pipe and the suction pipe, and an injection and suction assembly mounting plate for mounting the injection and suction lifting seat, wherein the injection and suction lifting seat is escalably mounted on the injection and suction assembly mounting plate through a vertical guide rail mechanism, and the injection and suction assembly mounting plate is fixed to the frame; the distance between the injection pipe and the suction pipe is equal to the distance between the two straight pipes of the U-shaped lamp tube; the upper end of the injection pipe is directly or indirectly connected to the liquid outlet end of the injection pump, the upper end of the suction pipe is directly or indirectly connected to the liquid inlet end of the liquid pump, and the lower end of the suction pipe is connected to a section of soft rubber hose; The injection and suction lifting seat is hinged to the upper end of an injection and suction assembly connecting rod, and the lower end of the injection and suction assembly connecting rod is hinged to the swing end of an injection and suction driving swing rod; the injection and suction driving swing rod is a single-arm swing rod, the swing axis is located at the other end of the swing rod, and the middle part of the swing rod is pressed against an injection and suction driving cam, and the injection and suction driving cam is installed on a main shaft, and the main shaft is driven to rotate by a motor, and the injection and suction driving cam drives the injection and suction driving swing rod to swing, and the injection and suction driving swing rod drives the injection and suction lifting seat to rise and fall through the injection and suction assembly connecting rod; The coating assembly also includes a secondary suction component, which includes a pipette, a suction lifting seat for fixing the pipette, and a suction component mounting plate for mounting the suction lifting seat. The suction lifting seat is mounted on the suction component mounting plate in a liftable manner via a vertical guide rail mechanism, and the suction component mounting plate is fixed to the frame. The upper end of the pipette is directly or indirectly connected to the liquid inlet end of the liquid pump, and the lower end of the pipette is connected to a section of soft rubber hose.

2. The U-shaped lamp tube coating machine according to claim 1, characterized in that: The suction lifting seat is hinged to the upper end of a suction component connecting rod, and the lower end of the suction component connecting rod is hinged to the swing end of a suction driving swing rod; the suction driving swing rod is a single-arm swing rod, and the swing axis is located at the other end of the swing rod, and the middle part of the swing rod is pressed against a suction driving cam, and the suction driving cam is installed on a main shaft, and the main shaft is driven to rotate by a motor, and the suction driving cam drives the suction driving swing rod to swing, and the suction driving swing rod drives the suction lifting seat to rise and fall through the suction component connecting rod.

3. The U-shaped lamp tube coating machine according to claim 1, characterized in that: The coating assembly also includes a pressing device, which includes a sliding rod seat horizontally installed on a frame and a horizontal sliding rod slidably arranged on the sliding rod seat; a rubber pressing block is fixed to one end of the horizontal sliding rod close to the work station clamp, and the other end is hinged to a connecting rod of the pressing device that provides linear drive.

4. The U-shaped lamp tube coating machine according to claim 3, characterized in that: The membrane liquid drying device includes a heating tube installed above the transmission link, fixed by a frame, and equipped with an electric furnace wire; the heating tube is connected to a long square hot air tube; there are two square hot air tubes, which are respectively arranged on both sides of the frame; the square hot air tube is provided with a plurality of hot air nozzles with openings facing downwards; the hot air nozzles are arranged corresponding to the workstation clamps.

5. The U-shaped lamp tube coating machine according to claim 4, characterized in that: It also includes a synchronous driving mechanism for synchronously driving the action parts in the upper tube device, the injection and suction assembly, the top pressing device, and the lower tube device, wherein the synchronous driving mechanism includes a motor, a main shaft connected to the output end of the motor, a first cam, a second cam, a third cam, and a fourth cam mounted on the main shaft, and a first swing rod, a second swing rod, a third swing rod, and a fourth swing rod that are swingably arranged relative to the frame; The first swing rod is a linear swing rod, the swing axis is located in the middle of the swing rod, the first swing arm of the first swing rod abuts against the first cam, the second swing arm of the first swing rod is hinged to the lower end of the upper tube device connecting rod, and the upper end of the upper tube device connecting rod is hinged to the upper tube swing arm; The second swing rod is a bent L-shaped swing rod, the swing axis is located at the corner of the swing rod, the first swing arm of the second swing rod abuts against the second cam, and the upper end of the second swing arm of the second swing rod is hinged to the connecting rod of the top pressing device; The third swing rod is a linear swing rod, the swing axis is located at the first end of the swing rod, the middle part of the third swing rod abuts against the third cam, the second end of the third swing rod is hinged to the lower end of the injection and suction assembly connecting rod, and the upper end of the injection and suction assembly connecting rod is hinged to the injection and suction lifting seat; The fourth swing rod is a linear swing rod, with the swing axis located in the middle of the swing rod, the first swing arm of the fourth swing rod rests on the fourth cam, the second swing arm of the fourth swing rod is hinged to the lower end of the lower tube device connecting rod, and the upper end of the lower tube device connecting rod is hinged to the lower tube swing arm.

Images