A screen printing machine for syringe barrels

Abstract

The present invention discloses a screen printing machine for syringe barrels, comprising a printer body and a high-pressure airless oil spraying device, the high-pressure airless oil spraying device comprising an oil supply mechanism, a pressurizing mechanism, an oil spraying mechanism and a control box, the pressurizing mechanism, the oil spraying mechanism and the control box being respectively arranged on the side wall of the printer body through a support plate, the oil supply mechanism being connected to the pressurizing mechanism, and the oil spraying mechanism being arranged directly opposite the discharge end of the printer body; the oil supply mechanism comprising a stainless steel bracket, an oil level alarm and an electric paddle, and the oil spraying mechanism comprising an oil gun, a multi-directional adjustment bracket, an oil gun socket, a photoelectric switch and an oil gun heating coil. The screen printing machine for syringe barrels of the present invention is provided with a high-pressure airless oil spraying device at the discharge end of the screen printing machine, the high-pressure airless oil spraying device being suitable for spraying oil on the inner wall of the syringe after printing the scale, having a good atomization effect on the silicone oil, high spraying performance and good spraying effect, greatly reducing the amount of diluent used, and being more environmentally friendly.

Description

Technical Field

[0001] The invention relates to a screen printing machine for syringe barrels. Background Art

[0002] Various types of disposable syringes are widely used in clinical medicine. Before installation, the syringe barrel and the piston rod rubber plug inside the syringe must be treated with siliconized oil spray to ensure good sealing and lubrication between the syringe barrel and the piston rod rubber plug.

[0003] Currently, the oil spray device for syringe barrels is mostly installed on syringe assembly machines. Before the syringe barrel and piston rod are assembled, silicone oil is sprayed into the barrel to ensure proper sealing and lubrication of the piston rod before assembly. However, due to the complex structure of syringe assembly machines, installing an oil spray device on them would undoubtedly further increase the complexity of the assembly machine, resulting in poor coordination between its various processes and reduced production efficiency.

[0004] In the existing technology, silicone oil must be dissolved in a diluent in advance. The diluent is a type of Freon, which has a low boiling point and is volatile. The mixture of silicone oil and diluent is commonly known as "siliconized liquid", and then it is sprayed into the syringe barrel with compressed air. The weight ratio of silicone oil to solvent in the siliconized liquid generally does not exceed 20:100. After the siliconized liquid is sprayed into the syringe barrel, the diluent will all evaporate in the workshop space, leaving only the silicone oil on the inner wall of the jacket. The solvent (Freon) has a destructive effect on the atmospheric ozone layer. At the same time, the cost of the evaporated solvent itself is high.

[0005] In the existing oil spraying equipment, the oil pots are all made of stainless steel with a liquid level display tube. The liquid inside is transparent and it is not easy to observe the amount of siliconized liquid. Moreover, the entire oil spraying operation needs to be suspended when replenishing the siliconized liquid, and the silicone oil cannot be replenished in time. There is a lack of components for controlling the oil supply between the oil pot and the pressurizing device. When not working, the siliconized liquid in the oil pot is also in direct contact with the pressurizing device. When spraying, it is necessary to pressurize. When pressurizing, the water vapor in the compressed air will mix with the silicone oil, which is easy to emulsify the silicone oil. In addition, the silicone oil needs to be diluted with a large amount of diluent before it can be sprayed out. If the amount of diluent is too large, the diluent in the oil mist sprayed by the oil gun will evaporate and scatter everywhere, polluting the air and being detrimental to the environment.

[0006] Airless sprayers use a plunger pump to pressurize the paint. The high-pressure paint is then transported to the oil gun via a high-pressure hose. The pressure is then released through a nozzle to form an atomized coating, creating a dense coating on the surface. High-pressure airless spraying, a key category of coating technology, has been widely used across various industries. However, there are currently no screen printers for syringe barrels suitable for syringe assembly. Current high-pressure airless sprayers suffer from issues such as excessive size, poor automatic control capabilities, difficulty ensuring spray atomization, and an inability to spray high-viscosity silicone oils. In particular, air pressure cannot be quantified, measuring only seconds at best, making precise spraying impossible. This significantly restricts the application of high-pressure airless spraying technology in the syringe assembly field. For example, upon receiving a photoelectric signal indicating the product's position, existing spraying devices send an execution program to the spray gun's air and liquid circuit switches (with a 10-20ms delay), completing the entire spraying operation within 0-100ms. Summary of the Invention

[0007] The purpose of the present invention is to overcome the defects of the prior art and provide a screen printing machine for syringe barrels. A high-pressure airless oil spray device is provided at the discharge end of the screen printing machine. The high-pressure airless oil spray device is suitable for spraying oil on the inner wall of the syringe with printed scale. It has a good atomization effect on silicone oil, high spraying performance, and good spraying effect, greatly reducing the amount of diluent used, and can realize a low-solvent or even solvent-free siliconization process, which is of great significance to reducing costs and increasing efficiency for enterprises and protecting the environment.

[0008] The technical solution to achieve the above object is: a screen printer for syringe barrels, comprising a printer body and a high-pressure airless oil spray device, wherein the high-pressure airless oil spray device comprises an oil supply mechanism, a pressurizing mechanism, an oil spray mechanism and a control box, wherein the pressurizing mechanism, the oil spray mechanism and the control box are respectively arranged on the side wall of the printer body through a support plate, the oil supply mechanism is connected to the pressurizing mechanism, and the oil spray mechanism is arranged directly opposite the discharge end of the printer body, wherein:

[0009] The oil supply mechanism includes a stainless steel bracket, an oil level alarm and an electric paddle. A glass liner with a scale is concentrically arranged in the stainless steel bracket; an alarm shell is welded to the outside of the stainless steel bracket, and the oil level alarm is clamped in the alarm shell and closely adheres to the outer wall of the glass liner; the upper end of the stainless steel bracket is threadedly connected to an upper cover, and a sealing ring is provided between the connection between the upper cover and the stainless steel bracket; an air filter is provided on the upper cover; a sleeve is threadedly connected to the upper end opening of the upper cover, and the upper end opening of the sleeve The internal thread is connected to a sleeve cover, and a PTFE dustproof oil seal is provided at the bottom end of the sleeve cover; the electric paddle includes a motor and a paddle connected thereto, the motor is arranged at the top of the sleeve cover, and the paddle is arranged in the glass liner; the lower end of the stainless steel bracket is threadedly connected to an oil cup base, and a filter seal is provided between the lower end opening of the glass liner and the oil cup base; an oil valve ejector pin for controlling oil discharge is provided in the oil cup base, and the bottom end of the oil cup base is connected to an oil pump connector, and the lower end of the oil valve ejector pin is inserted into the oil pump connector;

[0010] The pressurizing mechanism includes a housing, a high-pressure oil pump, an oil pump base, a cylinder, a cylinder base and a solenoid valve, the bottom end of the housing is fixed to the housing base, the top end of the housing is provided with a housing cover, the oil pump base and the cylinder base are arranged in the housing one above the other, and the oil pump base, the cylinder base and the housing base are connected by screws and nuts respectively; the high-pressure oil pump is arranged on the oil pump base, and the cylinder is arranged on the cylinder base; a cylinder oil pump height-fixing sleeve is provided between the cylinder and the oil pump base; the cylinder piston of the cylinder is connected to the high-pressure oil pump through an oil pump spring; the solenoid valve is arranged on the housing base, and the solenoid valve is connected to the air inlet and exhaust port of the cylinder through a pipeline;

[0011] The lower end opening of the oil pump connector is threadedly connected to the oil inlet nozzle of the high-pressure oil pump, and a retaining spring block is provided at the oil inlet nozzle of the high-pressure oil pump;

[0012] The oil injection mechanism includes an oil gun, a multi-directional adjustment bracket, an oil gun socket, a photoelectric switch, and an oil gun heating coil. The oil gun is mounted on the multi-directional adjustment bracket via an oil gun protective sleeve. A fixing plate is provided at one end of the oil gun protective sleeve, and the oil gun socket is fixed to the fixing plate. The photoelectric switch is disposed adjacent to the oil gun. The oil gun heating coil is wrapped around the exterior of the oil gun outlet end and is covered with a heating coil protective sleeve. The photoelectric switch, oil gun, and oil gun heating coil are electrically connected to the oil gun socket.

[0013] The oil inlet of the oil gun is connected to the oil outlet nozzle of the high-pressure oil pump through an air pipe; and a pressure gauge is provided on the oil outlet nozzle of the high-pressure oil pump;

[0014] The motor, oil level alarm, solenoid valve, pressure gauge and oil gun socket of the electric paddle are respectively connected to the control box.

[0015] The above-mentioned screen printing machine for syringe barrels, wherein the upper cover is provided with a filter mounting hole, and the air filter is threadedly connected to the filter mounting hole;

[0016] The electric paddle also includes a motor housing, a blade flange and a ball bearing. The motor is installed in the motor housing by screws, the blade flange is connected to the output end of the motor by screws, and the ball bearing is arranged in the sleeve cover; the tail end of the blade passes through the ball bearing and is clamped in the blade mounting hole on the blade flange, and a retaining spring is arranged between the tail end of the blade and the lower end of the blade flange; the motor drives the blade flange to rotate, thereby driving the blade to rotate.

[0017] The screen printing machine for syringe barrels described above, wherein an oil passage hole extending vertically therethrough is provided in the middle of the oil cup base, a rubber ring is provided between the top of the oil valve ejector pin and the oil cup base, and the lower end of the oil valve ejector pin passes through the oil passage hole in the middle of the oil cup base and is inserted into the oil pump joint; an oil valve retaining spring is installed in the middle of the oil valve ejector pin, a spring is sleeved on the outside of the oil valve ejector pin, and the spring is located above the oil valve retaining spring; a rubber pad is sheathed on the spring, and the rubber pad is located in the oil pump joint; the oil valve retaining spring is tightly attached to the retaining spring baffle;

[0018] When the oil is supplied, the bottom end of the oil pump connector is in close contact with the step surface of the oil inlet nozzle of the high-pressure oil pump, and the top end of the oil valve ejector pin leaves the top end of the oil passage through hole; when the oil is not supplied, there is a gap between the bottom end of the oil pump connector and the step surface of the oil inlet nozzle of the high-pressure oil pump, and the top end of the oil valve ejector pin is blocked at the top end of the oil passage through hole.

[0019] The above-mentioned screen printing machine for syringe barrels, wherein the oil pump base, cylinder base and shell base are fixed by four screws, each screw passes through the oil pump base, cylinder base and shell base in sequence from top to bottom, and the screw and the oil pump base, the screw and the cylinder base, and the screw and the shell base are fastened by nuts respectively.

[0020] The above-mentioned screen printing machine for syringe barrels, wherein the high-pressure oil pump adopts a plunger pump, the oil outlet nozzle of the high-pressure oil pump is also provided with a pressure switch, the air inlet of the cylinder is provided with a hand sliding valve, a pressure reducing valve and a cylinder pressure gauge, and the pressure reducing valve is arranged on the outer wall of the shell through a pressure reducing valve bracket.

[0021] The above-mentioned screen printing machine for syringe barrels, wherein the multi-directional adjustment bracket includes a transverse adjustment flange, a longitudinal adjustment flange, a height adjustment rod, a height adjustment sleeve and a radial adjustment sleeve; wherein:

[0022] The transverse adjustment flange is provided with a transverse waist hole, and the longitudinal adjustment flange is provided with a longitudinal waist hole; the longitudinal adjustment flange is arranged on the transverse adjustment flange, and the longitudinal waist hole of the longitudinal adjustment flange is connected to the transverse adjustment flange by screws;

[0023] The bottom end of the height adjustment sleeve is welded to the longitudinal adjustment flange, and a plurality of screw holes are sequentially opened on the side wall of the height adjustment sleeve from top to bottom;

[0024] The height adjustment rod is rotatably inserted into the height adjustment sleeve, and the height adjustment rod is adjusted and locked by a screw fitting into any screw hole on the height adjustment sleeve;

[0025] The lower end of the radial adjustment sleeve is mounted on the top of the height adjustment rod so as to be able to swing back and forth. The height adjustment rod is covered with a fixing ring, and the fixing ring is located below the radial adjustment sleeve.

[0026] The bottom end of the oil gun protective sleeve is welded to the top end of the radial adjustment sleeve.

[0027] The above-mentioned screen printing machine for syringe barrels, wherein the top of the oil gun protective cover is provided with an oil gun mounting groove, the oil gun is longitudinally inserted into the oil gun mounting groove and fastened by screws;

[0028] A socket mounting hole is provided on the fixing plate, and the oil gun socket is arranged in the socket mounting hole;

[0029] The heating coil protective cover and the oil gun are locked by screws.

[0030] The above-mentioned screen printing machine for syringe barrels, wherein the top end of the height adjustment rod is provided with a radial adjustment sleeve mounting groove that passes through front and back, the groove wall of the radial adjustment sleeve mounting groove is provided with a through hole that passes through left and right, and the lower end of the radial adjustment sleeve is provided with a rotating shaft insertion hole that passes through left and right; the lower end of the radial adjustment sleeve is inserted into the radial adjustment sleeve mounting groove, and the through hole on the groove wall of the radial adjustment sleeve mounting groove and the rotating shaft insertion hole are connected with a rotating shaft, and the radial adjustment sleeve swings back and forth along the rotating shaft.

[0031] In the above-mentioned screen printing machine for syringe barrels, an oil pressure signal indicator light, an oil level signal indicator light, an emergency stop button, a power switch and a touch screen are provided on the side wall of the control box.

[0032] The above-mentioned screen printing machine for syringe barrels, wherein the glass liner is filled with siliconized liquid, the control box controls the operation of the motor, and the motor drives the paddle to rotate to prevent the siliconized liquid in the glass liner from stratifying;

[0033] The oil level alarm monitors the siliconized liquid level in the glass liner in real time, and feeds back the siliconized liquid level signal to the control box, and the oil level is indicated by the oil level signal indicator light;

[0034] The pressure gauge monitors the oil pressure value at the oil outlet of the high-pressure oil pump in real time, and feeds back the oil pressure value signal to the control box, and the oil pressure is indicated by the oil pressure signal indicator light;

[0035] When the photoelectric switch senses that the product to be sprayed passes by, the photoelectric switch sends a photoelectric signal to the control box. When the control box receives the photoelectric signal that the product is in place, it sends an execution signal to the solenoid valve. The solenoid valve opens, and the cylinder drives the high-pressure oil pump to move, transporting the siliconized liquid in the glass liner to the oil gun through the high-pressure oil pump and the air pipe. The oil gun completes the oil spraying in 300 to 400 μs.

[0036] The screen printing machine for syringe barrels of the present invention is equipped with a high-pressure airless oil spray device at the discharge end of the screen printing machine. The high-pressure airless oil spray device is suitable for spraying oil on the inner wall of the syringe barrel with printed scales. It has a good atomization effect on silicone oil, high spraying performance, and good spraying effect, greatly reduces the amount of diluent used, and can realize a low-solvent or even solvent-free siliconization process, which is of great significance to reducing costs and increasing efficiency for enterprises and protecting the environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is a three-dimensional structural diagram of the screen printing machine for syringe barrels of the present invention;

[0038] Figure 2 A partial enlarged view of part A of the screen printing machine for syringe barrels of the present invention;

[0039] Figure 3 It is a three-dimensional structural diagram of the high-pressure airless fuel injection device;

[0040] Figure 4 This is a three-dimensional structural diagram of the oil supply mechanism (from the main viewing direction);

[0041] Figure 5 This is a three-dimensional structural diagram of the oil supply mechanism (looking up);

[0042] Figure 6 It is a cross-sectional view of the oil supply mechanism;

[0043] Figure 7 This is the exploded structural diagram of the oil supply mechanism;

[0044] Figure 8 A three-dimensional structural diagram of the sleeve cover of the oil supply mechanism;

[0045] Figure 9 It is a front view of the sleeve cover of the oil supply mechanism;

[0046] Figure 10 It is a cross-sectional view of the sleeve cover of the oil supply mechanism along the AA line;

[0047] Figure 11 This is the exploded structural diagram of the electric propeller of the oil supply mechanism;

[0048] Figure 12 This is a schematic diagram of the connection between the oil valve ejector pin, oil cup base and high-pressure oil pump (from the main view direction);

[0049] Figure 13 This is a schematic diagram of the connection between the oil valve ejector pin, oil cup base and high-pressure oil pump (looking from above);

[0050] Figure 14 This is the working diagram of the oil valve ejector pin;

[0051] Figure 15 This is the external structure diagram of the pressurizing mechanism;

[0052] Figure 16 This is the internal structure diagram of the pressurizing mechanism;

[0053] Figure 17 This is a connection diagram of the high-pressure oil pump, cylinder and solenoid valve of the pressurizing mechanism;

[0054] Figure 18 It is a three-dimensional structural diagram of the fuel injection mechanism;

[0055] Figure 19 This is the installation diagram of the oil gun heating ring of the oil injection mechanism;

[0056] Figure 20 This is an exploded structural diagram of the multi-directional adjustment bracket of the fuel injection mechanism;

[0057] Figure 21 This is a schematic diagram of the connection between the oil gun, oil gun protective cover and fixing plate;

[0058] Figure 22 This is the external structure diagram of the control box;

[0059] Figure 23 The figure is a working principle diagram of the screen printing machine for syringe barrels of the present invention. DETAILED DESCRIPTION

[0060] In order to enable those skilled in the art to better understand the technical solution of the present invention, the specific implementation methods thereof are described in detail below with reference to the accompanying drawings:

[0061] See also Figures 1 to 23 The preferred embodiment of the present invention is a screen printer for syringe barrels, comprising a printer body 5 and a high-pressure airless oil spraying device. The high-pressure airless oil spraying device comprises an oil supply mechanism 1, a pressurizing mechanism 2, an oil spraying mechanism 3, and a control box 4. The pressurizing mechanism 2 is mounted on a side wall of the printer body 5 via a pressurizing mechanism support plate 51, and the oil spraying mechanism 3 is mounted on a side wall of the printer body 5 via an oil spraying mechanism support plate 52. The control box 4 is mounted on a side wall of the printer body 5 via a control box support plate 53. The oil supply mechanism 1 is connected to the pressurizing mechanism 2, and the oil spraying mechanism 3 is positioned directly opposite the discharge end of the printer body 5. The printer body 5 is provided with a conveyor belt 55, which is provided with a product retaining slot 56. After the scale printing area 54 prints the scale, the syringe barrel moves along the product retaining slot 56 on the conveyor belt 55 to the position of the oil spraying mechanism 3, which then sprays the inner wall of the syringe barrel. The printer body 5 is provided with a printer controller 50.

[0062] See also Figures 4 to 14 The oil supply mechanism 1 includes a stainless steel bracket 17, an oil alarm 19 and an electric paddle. A glass liner 18 with a scale is concentrically arranged in the stainless steel bracket 17; an alarm housing 110 is welded to the outside of the stainless steel bracket 17, and the oil alarm 19 is snapped into the alarm housing 110 and close to the outer wall of the glass liner 18. The oil alarm 19 is used to monitor the liquid level in the glass liner 18 in real time; the upper end of the stainless steel bracket 17 is threadedly connected to the upper cover 15, and a sealing ring 16 is provided between the connection between the upper cover 15 and the stainless steel bracket 17; an air filter 14 is provided on the upper cover 15, specifically, a filter mounting hole is opened on the upper cover 15, and the air filter 14 is threadedly connected to the filter mounting hole The air filter 14 has a filtration pore size of 0.2 microns, which filters dust in the air and prevents bacterial contamination; the upper end opening of the upper cover 15 is internally threadedly connected to the sleeve 13, and the upper end opening of the sleeve 13 is internally threadedly connected to the sleeve cover 11, and the bottom end of the sleeve cover 11 is provided with a polyfluoroethylene dust-proof oil seal 12. Specifically, the bottom end of the sleeve cover 11 has a card groove a, and the polyfluoroethylene dust-proof oil seal 12 is arranged in the card groove a; the lower end of the stainless steel bracket 17 is threadedly connected to the oil cup base 112, and a filter sealing ring 111 is provided between the lower end opening of the glass liner 18 and the oil cup base 112. The filter sealing ring 111 has a 300-mesh filtration effect, which can filter out particulate particles in the siliconized liquid, so that the quality of the siliconized liquid supplied to the high-pressure oil pump is better.

[0063] The upper cover 15 and the oil cup base 112 are connected via threads in the stainless steel bracket 17 , and the graduated glass liner 18 is firmly fixed in the stainless steel bracket 17 .

[0064] The electric paddle includes a motor 114 and a paddle 117 connected thereto, and also includes a motor housing 113, a paddle flange 115 and a ball bearing 116. The motor 114 is arranged at the top of the sleeve cover 11, and the paddle 117 is arranged in the glass inner liner 18; the motor 114 is installed in the motor housing 113 by screws, the paddle flange 115 is connected to the output end of the motor 114 by screws, and the ball bearing 116 is arranged in the sleeve cover 11. Specifically, the upper end of the sleeve cover 11 has a slot b, and the ball bearing 116 is arranged in the slot b; the tail end of the paddle 117 passes through the ball bearing 116 and is clamped in the paddle mounting hole d on the paddle flange 115. The shape of the tail end of the paddle 117 is adapted to the shape of the paddle mounting hole d. For example, the tail end of the paddle 117 is square and the paddle mounting hole d is also square. A slot c is formed on the tail end of the blade 117 , in which a retaining spring 119 ′ is disposed. The retaining spring 119 ′ is located at the lower end of the blade flange 115 . The motor 114 drives the blade flange 115 to rotate, thereby driving the blade 117 to rotate.

[0065] Glass liner 18 is used to hold the siliconized liquid. When the siliconized liquid is left for a long time, it tends to separate due to the different specific gravities of the silicone oil and diluent. The stirring by the electric paddle helps maintain a uniform mixture of the two. Motor 114 is preferably a quick-plug, brushless motor with electrical isolation. If the siliconized liquid level in glass liner 18 is too low, motor 114 can be paused, upper cover 15 can be unscrewed, and the glass liner 18 can be replenished at any time without pausing the entire spraying device, making refilling more convenient.

[0066] An oil valve pin 118 for controlling oil discharge is provided in the oil cup base 112. The bottom end of the oil cup base 112 is connected to an oil pump connector 124, and the lower end of the oil valve pin 118 is inserted into the oil pump connector 124. Specifically, an oil passage through-hole running through the top and bottom is provided in the middle of the oil cup base 12. A rubber ring 120 is provided between the top of the oil valve pin 118 and the oil cup base 112. Specifically, a rubber ring mounting groove e is provided at the top of the oil passage through-hole of the oil cup base 112, and the rubber ring 120 is provided in the rubber ring mounting groove e. The lower end of the oil valve ejector pin 118 passes through the oil passage hole in the middle of the oil cup base 112 and is inserted into the oil pump joint 124; an oil valve retaining spring mounting groove f is provided in the middle of the oil valve ejector pin 118, and an oil valve retaining spring 119 is installed in the oil valve retaining spring mounting groove f. A spring 122 is sleeved on the outside of the oil valve ejector pin 118, and the spring 122 is located above the oil valve retaining spring 119; a rubber pad 123 is sheathed on the spring 118, and the rubber pad 123 is located in the oil pump joint 124; an oil pump joint mounting hole g is provided at the bottom end of the oil cup base 112, and the upper end of the oil pump joint 124 is arranged in the oil pump joint mounting hole g.

[0067] The lower end opening of the oil pump connector 124 is threadedly connected to the oil inlet nozzle 220 of the high-pressure oil pump 21 , and a retaining spring block 22 is provided at the oil inlet nozzle 220 of the high-pressure oil pump 21 ; the oil valve retaining spring 119 is tightly attached to the retaining spring block 22 .

[0068] See also Figure 14 When the oil is supplied, the oil pump connector 124 is rotated downward so that the bottom end of the oil pump connector 124 is in close contact with the step surface of the oil inlet nozzle of the high-pressure oil pump 21, and the oil cup base 112 moves downward with the oil pump connector 124. The top end of the oil valve pin 118 leaves the top end of the oil passage through-hole, the oil passage through-hole is opened, and the siliconized liquid in the glass liner 18 enters the high-pressure oil pump 21 through the oil passage through-hole; when the oil is not supplied, the oil pump connector 124 is rotated upward, and the oil cup base 112 moves upward with the oil pump connector 124, so that there is a 2 mm gap between the bottom end of the oil pump connector 124 and the step surface of the oil inlet nozzle of the high-pressure oil pump 21, and the top end of the oil valve pin 118 is blocked at the top end of the oil passage through-hole, the oil passage through-hole is closed, and the siliconized liquid in the glass liner 18 cannot enter the high-pressure oil pump 21.

[0069] See also Figures 15 to 17 The pressurizing mechanism 2 includes a housing 211, a high-pressure oil pump 21, an oil pump base 23, a cylinder 24, a cylinder base 25 and a solenoid valve 26. The bottom end of the housing 211 is fixed to the housing base 212, and the top of the housing 21 is provided with a housing cover 210. The oil pump base 23 and the cylinder base 25 are arranged one above and one below in the housing 211. The oil pump base 23, the cylinder base 25 and the housing base 212 are respectively connected by screws 28 and nuts 27. Specifically, the oil pump base 23, the cylinder base 25 and the housing base 212 are fixed by four screws 28. Each screw 28 passes through the oil pump base 23, the cylinder base 25 and the housing base 212 from top to bottom in sequence, and the screw 28 and the oil pump base 23, the screw 28 and the cylinder base 25, and the screw 28 and the housing base 212 are respectively fastened by nuts 27.

[0070] The high-pressure oil pump 21 is mounted on an oil pump base 23, and the cylinder 24 is mounted on a cylinder base 25. A cylinder pump height-fixing sleeve 29 is disposed between the cylinder 24 and the oil pump base 25. The cylinder piston 241 of the cylinder 24 is connected to the high-pressure oil pump 21 via an oil pump spring 231. The solenoid valve 26 is mounted on the housing base 212 and is connected to the air inlet 242 and the exhaust port 243 of the cylinder 24 via a pipeline (not shown).

[0071] The oil inlet 352 of the oil gun 35 is connected to the oil outlet 221 of the high-pressure oil pump 21 via the air pipe 30. The oil outlet 221 of the high-pressure oil pump 21 is equipped with a pressure gauge 213 and a pressure switch 214. The air inlet 242 of the cylinder 24 is equipped with a manual sliding valve 215, a pressure reducing valve 217, and a cylinder pressure gauge 216. The pressure reducing valve 217 is mounted on the outer wall of the housing 211 via a pressure reducing valve bracket 219. The pressure gauge 213 is used to monitor the pressure at the oil outlet 221 in real time. The housing 211 is equipped with a socket 218, which is electrically connected to the cylinder 24.

[0072] High-pressure oil pump 21 utilizes a plunger pump with a pressure range of 10-15 MPa. The pressure from cylinder 24 drives the plunger pump. When the cylinder area is 32 times that of the plunger pump, the liquid pressure within high-pressure oil pump 21 can be increased by approximately 32 times. This high pressure allows for pressurized injection of high-viscosity liquids, significantly reducing the amount of diluent used in the siliconizing fluid and contributing to energy conservation and environmental protection.

[0073] See also Figures 18 to 21 The oil injection mechanism 3 includes an oil gun 35, a multi-directional adjustment bracket, an oil gun socket 37, a photoelectric switch 38 and an oil gun heating ring 39. The oil gun 35 is arranged on the multi-directional adjustment bracket through an oil gun protective cover 36. Specifically, the multi-directional adjustment bracket includes a transverse adjustment flange 31, a longitudinal adjustment flange 32, a height adjustment rod 34, a height adjustment sleeve 33 and a radial adjustment sleeve 311; a transverse waist hole is opened on the transverse adjustment flange 31, and a longitudinal waist hole is opened on the longitudinal adjustment flange 32; the longitudinal adjustment flange 32 is arranged on the transverse adjustment flange 31, and the longitudinal waist hole of the longitudinal adjustment flange 32 is fixed by screws On the transverse adjustment flange 31, the transverse waist hole of the transverse adjustment flange 31 is connected to the external device via screws. By adjusting the position of each screw in the longitudinal waist hole and the transverse waist hole, the front, back, left, and right position of the longitudinal adjustment flange 32 can be adjusted. The bottom end of the height adjustment sleeve 33 is welded to the longitudinal adjustment flange 32. The side wall of the height adjustment sleeve 33 is sequentially provided with a plurality of screw holes 331 from top to bottom. The height adjustment rod 34 is rotatably inserted into the height adjustment sleeve 33. The height adjustment rod 34 is adjusted and locked by screws 341 and any screw holes 331 on the height adjustment sleeve 33. The height adjustment rod 34 rotates within the height adjustment sleeve 33 to achieve horizontal rotation adjustment. The installation position of the height adjustment rod 34 in the height adjustment sleeve 33 is adjusted by screws 331 and screws to achieve height adjustment.

[0074] The lower end of the radial adjustment sleeve 311 is mounted on the top of the height adjustment rod 34 so as to be able to swing back and forth. A fixing ring 312 is provided on the outer cover of the height adjustment rod 34, and the fixing ring 312 is located below the radial adjustment sleeve 311. Specifically, a radial adjustment sleeve mounting groove 342 that passes through the front and back is provided at the top of the height adjustment rod 34. A through hole 343 that passes through the left and right is provided on the groove wall of the radial adjustment sleeve mounting groove 342. A rotating shaft insertion hole 344 that passes through the left and right is provided at the lower end of the radial adjustment sleeve 311. The lower end of the radial adjustment sleeve 311 is inserted into the radial adjustment sleeve mounting groove 342, and a rotating shaft is inserted into the through hole 343 on the groove wall of the radial adjustment sleeve mounting groove and the rotating shaft insertion hole 344. The radial adjustment sleeve 311 swings back and forth along the rotating shaft.

[0075] The bottom end of the oil gun protection sleeve 36 is welded to the top end of the radial adjustment sleeve 311 .

[0076] The top of the oil gun protective sleeve 36 defines an oil gun mounting slot i. The oil gun 35 is longitudinally inserted into the slot i and secured with screws. A fixing plate mounting screw hole 361 is provided at the rear end of the oil gun protective sleeve 36. The front end of the fixing plate 313 is screwed into the fixing plate mounting screw hole 361. The rear end of the fixing plate 313 defines a socket mounting hole 345, within which the oil gun socket 37 is located. A photoelectric switch 38 is positioned adjacent to the oil gun 35. A heating coil 39 wraps around the exterior of the outlet end of the oil gun 35 and is covered with a heating coil protective sleeve 310. The heating coil protective sleeve 310 is screwed to the oil gun 35. The photoelectric switch 38, the oil gun 35, and the heating coil 39 are each electrically connected to the oil gun socket 37.

[0077] The oil gun heater 39 heats the oil gun 35, maintaining a constant temperature within the liquid and minimizing the effect of temperature on viscosity. The heater 39 can utilize a PID electric heater, a PTC heater, an infrared heater, or a thermal oil heater, with a temperature accuracy of ±1°C. Heating stops if the temperature exceeds the specified range. Because silicone oil viscosity varies with temperature, a thermostat like the heater 39 helps maintain a constant temperature of 40°C, controlling viscosity and precisely controlling the amount of oil sprayed. This ensures a constant temperature throughout the entire process.

[0078] The outlet end of the oil gun 35 is provided with 3-36 uniformly distributed nozzle holes 351: the aperture of each nozzle hole 351 is 0.1-0.3 mm, and the number of nozzle holes is related to the size of the injection.

[0079] The motor 114 of the electric propeller, the oil level alarm 19, the solenoid valve 26, the pressure gauge 213 and the oil gun socket 37 are respectively connected to the control box 4.

[0080] See also Figure 22An oil pressure signal indicator light 41 , an oil level signal indicator light 42 , an emergency stop button 43 , a power switch 44 and a touch screen 45 are provided on the side wall of the control box 4 .

[0081] See also Figure 23 After the high-pressure airless oil injection device is powered on, the PLC in the control box 4 is powered on and runs, and the process parameters are set through the touch screen 45, such as the oil pressure limit value and the oil level limit value. The glass liner 18 is filled with siliconized liquid. The control box 4 controls the motor 114 to work, and the motor 114 drives the paddle 117 to rotate to prevent the siliconized liquid in the glass liner 18 from stratifying. The oil quantity alarm 19 monitors the siliconized liquid level in the glass liner 18 in real time, and feeds back the siliconized liquid level signal to the control box 4, and indicates the oil level through the oil level signal indicator 42. For example, when the oil level is higher than the set value, the oil level signal indicator 42 displays green. When the oil level is lower than the set value, the oil quantity alarm 19 alarms and the oil level signal indicator 42 displays red. After the operator sees the alarm signal, he can pause the operation of the motor 114, directly open the upper cover 15, and add siliconized liquid to the glass liner 18; the pressure gauge 213 monitors the oil pressure value at the oil outlet 221 of the high-pressure oil pump 21 in real time, and feeds back the oil pressure value signal to the control box 4, and indicates the oil pressure through the oil pressure signal indicator 41. For example, when the oil pressure is greater than or equal to the set value of 10MPa, the oil pressure is normal, and the oil pressure signal indicator 41 displays green. When the oil pressure is less than the set value of 10MPa, the oil pressure is abnormal, and the oil pressure signal indicator 41 displays red.

[0082] The screen printing machine for syringe barrels of the present invention starts the printer body 5 and the entire high-pressure airless oil spraying device, the printer controller 50 and the PLC in the control box 4 are powered on and run, the printer controller 50 controls the printer to start working, the syringe barrel 6 to be printed with scale is transported along the conveyor belt to the scale printing area 54 for scale printing, and then moves along the product card slot 56 on the conveyor belt 55 to the position of the oil spraying mechanism 3. When the photoelectric switch 38 senses that the syringe barrel 6 to be sprayed passes by, the photoelectric switch 38 sends a photoelectric signal to the control box 4 through the oil gun socket 37. When the control box 4 receives the photoelectric signal that the product is in place, it sends an execution signal to the solenoid valve 26. The solenoid valve 26 opens, and the cylinder 24 drives the high-pressure oil pump 21 to move, and the siliconized liquid in the glass liner 18 is transported to the oil gun 35 through the high-pressure oil pump 21 and the air pipe 30. The oil gun 35 completes the oil spraying into the syringe barrel 6 in 300 to 400 μs.

[0083] In summary, the screen printing machine for syringe barrels of the present invention is equipped with a high-pressure airless oil spray device at the discharge end of the screen printing machine. The high-pressure airless oil spray device is suitable for spraying oil on the inner wall of the syringe with printed scales. It has a good atomization effect on silicone oil, high spraying performance, and good spraying effect, greatly reducing the amount of diluent used, and can realize a low-solvent or even solvent-free siliconization process, which is of great significance to enterprises in reducing costs, increasing efficiency, and protecting the environment.

[0084] Those skilled in the art should recognize that the above embodiments are merely intended to illustrate the present invention and are not intended to limit the present invention. As long as they are within the spirit of the present invention, any changes or modifications to the above embodiments will fall within the scope of the claims of the present invention.

Claims

1. A screen printing machine for syringe barrels, characterized in that: The invention comprises a printing machine body and a high-pressure airless oil spraying device, wherein the high-pressure airless oil spraying device comprises an oil supply mechanism, a pressurizing mechanism, an oil spraying mechanism and a control box, wherein the pressurizing mechanism, the oil spraying mechanism and the control box are respectively arranged on the side wall of the printing machine body through a support plate, the oil supply mechanism is connected to the pressurizing mechanism, and the oil spraying mechanism is arranged directly opposite the discharge end of the printing machine body, wherein: The oil supply mechanism includes a stainless steel bracket, an oil level alarm and an electric paddle. A glass liner with a scale is concentrically arranged in the stainless steel bracket; an alarm shell is welded to the outside of the stainless steel bracket, and the oil level alarm is clamped in the alarm shell and closely adheres to the outer wall of the glass liner; the upper end of the stainless steel bracket is threadedly connected to an upper cover, and a sealing ring is provided between the connection between the upper cover and the stainless steel bracket; an air filter is provided on the upper cover; a sleeve is threadedly connected to the upper end opening of the upper cover, and the upper end opening of the sleeve The internal thread is connected to a sleeve cover, and a PTFE dustproof oil seal is provided at the bottom end of the sleeve cover; the electric paddle includes a motor and a paddle connected thereto, the motor is arranged at the top of the sleeve cover, and the paddle is arranged in the glass liner; the lower end of the stainless steel bracket is threadedly connected to an oil cup base, and a filter seal is provided between the lower end opening of the glass liner and the oil cup base; an oil valve ejector pin for controlling oil discharge is provided in the oil cup base, and the bottom end of the oil cup base is connected to an oil pump connector, and the lower end of the oil valve ejector pin is inserted into the oil pump connector; The pressurizing mechanism includes a housing, a high-pressure oil pump, an oil pump base, a cylinder, a cylinder base and a solenoid valve, the bottom end of the housing is fixed to the housing base, the top end of the housing is provided with a housing cover, the oil pump base and the cylinder base are arranged in the housing one above the other, and the oil pump base, the cylinder base and the housing base are connected by screws and nuts respectively; the high-pressure oil pump is arranged on the oil pump base, and the cylinder is arranged on the cylinder base; a cylinder oil pump height-fixing sleeve is provided between the cylinder and the oil pump base; the cylinder piston of the cylinder is connected to the high-pressure oil pump through an oil pump spring; the solenoid valve is arranged on the housing base, and the solenoid valve is connected to the air inlet and exhaust port of the cylinder through a pipeline; The lower end opening of the oil pump connector is threadedly connected to the oil inlet nozzle of the high-pressure oil pump, and a retaining spring block is provided at the oil inlet nozzle of the high-pressure oil pump; The oil injection mechanism includes an oil gun, a multi-directional adjustment bracket, an oil gun socket, a photoelectric switch, and an oil gun heating coil. The oil gun is mounted on the multi-directional adjustment bracket via an oil gun protective sleeve. A fixing plate is provided at one end of the oil gun protective sleeve, and the oil gun socket is fixed to the fixing plate. The photoelectric switch is disposed adjacent to the oil gun. The oil gun heating coil is wrapped around the exterior of the oil gun outlet end and is covered with a heating coil protective sleeve. The photoelectric switch, oil gun, and oil gun heating coil are electrically connected to the oil gun socket. The oil inlet of the oil gun is connected to the oil outlet nozzle of the high-pressure oil pump through an air pipe; and a pressure gauge is provided on the oil outlet nozzle of the high-pressure oil pump; The motor, oil level alarm, solenoid valve, pressure gauge and oil gun socket of the electric propeller are respectively connected to the control box.

2. A screen printing machine for syringe barrels according to claim 1, characterized in that: A filter mounting hole is provided on the upper cover, and the air filter is threadedly connected to the filter mounting hole; The electric paddle also includes a motor housing, a blade flange and a ball bearing. The motor is installed in the motor housing by screws, the blade flange is connected to the output end of the motor by screws, and the ball bearing is arranged in the sleeve cover; the tail end of the blade passes through the ball bearing and is clamped in the blade mounting hole on the blade flange, and a retaining spring is arranged between the tail end of the blade and the lower end of the blade flange; the motor drives the blade flange to rotate, thereby driving the blade to rotate.

3. A screen printing machine for syringe barrels according to claim 1, characterized in that: An oil passage hole extending vertically therethrough is defined in the center of the oil cup base; a rubber ring is disposed between the top of the oil valve ejector pin and the oil cup base; the lower end of the oil valve ejector pin passes through the oil passage hole in the center of the oil cup base and is inserted into the oil pump connector; an oil valve retaining spring is mounted in the middle of the oil valve ejector pin; a spring is sleeved on the outside of the oil valve ejector pin, and the spring is located above the oil valve retaining spring; a rubber pad is sheathed around the spring, and the rubber pad is located in the oil pump connector; the oil valve retaining spring is in close contact with the retaining spring baffle; When the oil is supplied, the bottom end of the oil pump connector is in close contact with the step surface of the oil inlet nozzle of the high-pressure oil pump, and the top end of the oil valve ejector pin leaves the top end of the oil passage through hole; when the oil is not supplied, there is a gap between the bottom end of the oil pump connector and the step surface of the oil inlet nozzle of the high-pressure oil pump, and the top end of the oil valve ejector pin is blocked at the top end of the oil passage through hole.

4. A screen printing machine for syringe barrels according to claim 1, characterized in that: The oil pump base, cylinder base and shell base are fixed by four screws, each screw passes through the oil pump base, cylinder base and shell base from top to bottom, and the screw and the oil pump base, the screw and the cylinder base, and the screw and the shell base are fastened by nuts respectively.

5. The screen printing machine for syringe barrels according to claim 1, characterized in that: The high-pressure oil pump adopts a plunger pump, and a pressure switch is also provided on the oil outlet of the high-pressure oil pump. A hand sliding valve, a pressure reducing valve and a cylinder pressure gauge are provided on the air inlet of the cylinder, and the pressure reducing valve is arranged on the outer wall of the shell through a pressure reducing valve bracket.

6. A screen printing machine for syringe barrels according to claim 1, characterized in that: The multi-directional adjustment bracket includes a transverse adjustment flange, a longitudinal adjustment flange, a height adjustment rod, a height adjustment sleeve and a radial adjustment sleeve; wherein: The transverse adjustment flange is provided with a transverse waist hole, and the longitudinal adjustment flange is provided with a longitudinal waist hole; the longitudinal adjustment flange is arranged on the transverse adjustment flange, and the longitudinal waist hole of the longitudinal adjustment flange is connected to the transverse adjustment flange by screws; The bottom end of the height adjustment sleeve is welded to the longitudinal adjustment flange, and a plurality of screw holes are sequentially opened on the side wall of the height adjustment sleeve from top to bottom; The height adjustment rod is rotatably inserted into the height adjustment sleeve, and the height adjustment rod is adjusted and locked by a screw fitting into any screw hole on the height adjustment sleeve; The lower end of the radial adjustment sleeve is mounted on the top of the height adjustment rod so as to be able to swing back and forth. The height adjustment rod is covered with a fixing ring, and the fixing ring is located below the radial adjustment sleeve. The bottom end of the oil gun protective sleeve is welded to the top end of the radial adjustment sleeve.

7. A screen printing machine for syringe barrels according to claim 6, characterized in that: The top of the oil gun protective cover is provided with an oil gun mounting groove, and the oil gun is longitudinally inserted into the oil gun mounting groove and fastened by screws; A socket mounting hole is provided on the fixing plate, and the oil gun socket is arranged in the socket mounting hole; The heating coil protective cover and the oil gun are locked by screws.

8. The screen printing machine for syringe barrels according to claim 6, characterized in that: The top end of the height adjustment rod is provided with a radial adjustment sleeve mounting groove which passes through front and back, the groove wall of the radial adjustment sleeve mounting groove is provided with a through hole which passes through left and right, and the lower end of the radial adjustment sleeve is provided with a rotating shaft insertion hole which passes through left and right; the lower end of the radial adjustment sleeve is inserted into the radial adjustment sleeve mounting groove, and a rotating shaft is inserted into the through hole on the groove wall of the radial adjustment sleeve mounting groove and the rotating shaft insertion hole, and the radial adjustment sleeve swings back and forth along the rotating shaft.

9. The screen printing machine for syringe barrels according to claim 1, characterized in that: An oil pressure signal indicator light, an oil level signal indicator light, an emergency stop button, a power switch and a touch screen are arranged on the side wall of the control box.

10. The screen printing machine for syringe barrels according to claim 9, characterized in that: The glass liner is filled with siliconized liquid, the control box controls the motor to operate, and the motor drives the paddle to rotate to prevent the siliconized liquid in the glass liner from stratifying; The oil level alarm monitors the siliconized liquid level in the glass liner in real time, and feeds back the siliconized liquid level signal to the control box, and the oil level is indicated by the oil level signal indicator light; The pressure gauge monitors the oil pressure value at the oil outlet of the high-pressure oil pump in real time, and feeds back the oil pressure value signal to the control box, and the oil pressure is indicated by the oil pressure signal indicator light; When the photoelectric switch senses that the product to be sprayed passes by, the photoelectric switch sends a photoelectric signal to the control box. When the control box receives the photoelectric signal that the product is in place, it sends an execution signal to the solenoid valve. The solenoid valve opens, and the cylinder drives the high-pressure oil pump to move, transporting the siliconized liquid in the glass liner to the oil gun through the high-pressure oil pump and the air pipe. The oil gun completes the oil spraying in 300 to 400 μs.

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