Spray gun and jet printing machine head

Abstract

The utility model discloses a spray gun and a jet printing machine head, the spray gun comprises a rod-shaped gun body and a nozzle connected to the head of the gun body, an ejector pin is slidably connected in the gun body along the length direction of the gun body, the head of the nozzle is a conical nozzle, and a pressure cavity communicated with the nozzle is arranged in the nozzle; a first communicating cavity is formed in the head of the gun body, a liquid inlet hole and a liquid return hole are formed in the positions, close to the tail, of the gun body, the pressure cavity, the liquid inlet hole and the liquid return hole are all communicated with the first communicating cavity, and a driving mechanism used for driving the ejector pin to move axially is arranged at the tail of the gun body. When the spray gun stops working, the coating sequentially flows through the liquid inlet long hole, the first communicating cavity, the liquid return long hole and the liquid return hole, then flows into the liquid return pipeline and is conveyed into the coating barrel, so that circulation is formed, the coating is always kept in a flowing state in the gun body and in a pipeline connected with the gun body, the blocking phenomenon is not prone to occurring, and normal working of the spray gun is guaranteed.

Description

Technical Field

[0001] This utility model relates to the technical field of marking equipment in steel plants, and in particular to a spray gun and a printing head. Background Technology

[0002] Steel coils produced by steel mills must be marked with information such as batch number, material, and manufacturer before leaving the factory. There are two main methods of marking:

[0003] One method involves using a perforated template, which is then pressed tightly against the surface of the steel coil, and finally sprayed with a spray gun to create lettering on the coil. However, this method is inefficient, as one template can only be used for one type of marking, making it unreliable and rarely adopted.

[0004] Another method uses a robotic arm to hold the spray gun. The robotic arm is programmed to move, simulating human writing by spraying paint onto the steel coil surface. However, when the spray gun is not in use, the paint inside and in the connecting pipes is stagnant. This makes it easy for the paint to clog the pipes and the internal conduits of the spray gun, resulting in reduced paint flow, blurry writing, or even no paint being sprayed at all when the gun is reused. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide a spray gun and printing mechanism to solve the problem that paint is easily blocked in the pipeline connected to the spray gun and the internal pipes of the spray gun when the spray gun is not working.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0007] A spray gun includes a rod-shaped gun body and a nozzle connected to the head of the gun body. A pin is slidably connected to the gun body along its length. The head of the nozzle is a conical nozzle. A pressure chamber communicating with the nozzle is provided inside the nozzle. The head of the pin extends into the pressure chamber and abuts against the inside of the nozzle. The head of the gun body has a first communicating cavity. The gun body has an inlet hole and a return hole near the tail. The pressure chamber, the inlet hole, and the return hole are all communicating with the first communicating cavity. The tail of the gun body has a drive mechanism for driving the pin to move axially.

[0008] Furthermore, the nozzle is covered with a protective cap, which is connected to the head of the gun body. The protective cap has a through hole, and the nozzle is located inside the through hole. The first connecting cavity is located between the gun body and the protective cap, and the first connecting cavity is located outside the nozzle.

[0009] Further, the head and the nozzle of the gun body are provided with an annular second communication cavity, the liquid inlet hole and the first communication cavity are communicated through a liquid inlet long hole, the liquid inlet long hole and the second communication cavity are communicated through a second communication hole arranged on the gun body, the second communication cavity and the pressure cavity are communicated through a first communication hole arranged on the nozzle, and the liquid return hole and the first communication cavity are communicated through a liquid return long hole.

[0010] Further, the driving mechanism comprises a piston fixedly connected at one end to the tail of the needle, the piston is in axial sliding connection with the gun body, the piston is in sealing fit with the gun body, the gun body is provided with an air hole, the air hole is in communication with the side of the piston close to the nozzle, and the side of the piston away from the nozzle is provided with a third spring for applying an elastic force to the piston towards the nozzle.

[0011] Further, the other end of the piston is axially threadedly connected with a second adjusting screw, the third spring is sleeved outside the second adjusting screw, the tail of the gun body is fixedly connected with a nut, a first adjusting screw is threadedly connected in the nut in penetration, the first adjusting screw abuts against the end of the second adjusting screw away from the piston, one end of the third spring abuts against the piston, and the other end of the third spring abuts against the inner side of the nut, the piston is provided with a second spring, and the two ends of the second spring abut against the piston and the second adjusting screw respectively.

[0012] A printing head comprises the above-mentioned spray gun, a box body, a sliding sleeve and a flange plate, the gun body, the sliding sleeve and the flange plate are fixedly connected to the side of the box body respectively, the axis of the printing head and the axis of the sliding sleeve are located in the same plane, the angle bisector of the included angle between the axis of the printing head and the axis of the sliding sleeve coincides with the axis of the flange plate, a push rod coaxial with the sliding sleeve is slidably connected in penetration in the sliding sleeve, a travel switch is fixedly connected in the sliding direction of the push rod in the box body, and the box body is provided with a first spring for enabling the push rod to be reset outward.

[0013] Further, the box body is further provided with an electromagnetic valve, a fixed rod is fixedly connected in the box body, the fixed rod is coaxial with the push rod, the fixed rod is inserted into the push rod and is in sliding fit with the push rod, the first spring is sleeved outside the fixed rod, one end of the first spring abuts against the push rod, and the other end of the first spring abuts against the inner wall of the box body.

[0014] The positive effects of the utility model are as follows:

[0015] The spray gun comprises a gun body, a nozzle, a ejector pin and a driving mechanism, the nozzle is provided with a pressure cavity, the gun body is further provided with a first communication cavity, a liquid return long hole, a liquid return hole, a liquid inlet long hole and a liquid inlet hole which are communicated with the pressure cavity. The liquid inlet hole is connected with a liquid inlet pipeline, and the liquid return hole is connected with a liquid return pipeline. When the spray gun stops working, the ejector pin blocks the nozzle, the paint in the paint bucket flows into the liquid inlet hole through the pump and the liquid inlet pipeline, and then flows into the liquid return pipeline through the liquid inlet long hole, the first communication cavity, the liquid return long hole and the liquid return hole in sequence, and then is sent to the paint bucket, thereby forming a circulation, so that the paint always keeps a flowing state, and the clogging phenomenon is not easy to occur, and the normal work of the spray gun is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is a perspective view of examples 1 and 2;

[0017] Figure 2 is a bottom view of Figure 1 ;

[0018] Figure 3 is a sectional view of the A-A portion of Figure 2 ;

[0019] Figure 4 is a sectional view of the B-B portion of Figure 3 ;

[0020] Figure 5 is a perspective view of example 3;

[0021] Figure 6 is a schematic view of the internal structure of one side of the inkjet head;

[0022] Figure 7 is a schematic view of the internal structure of the other side of the inkjet head;

[0023] In the drawings:

[0024] 1, box body; 2, spray gun; 3, protective tube; 4, sliding sleeve; 5, push rod; 6, flange plate; 7, electromagnetic valve; 8, first spring; 9, fixed rod; 10, travel switch; 11, sleeve; 12, inlet hole; 13, protective cap; 14, gun body; 15, liquid inlet hole; 16, liquid return hole; 17, air hole; 18, nut; 19, first adjusting screw; 20, nozzle; 21, ejector pin; 22, second spring; 23, piston; 24, second adjusting screw; 25, third spring; 26, blowdown hole; 27, first communication cavity; 28, second communication cavity; 29, first communication hole; 30, pressure cavity; 31, liquid return long hole; 32, liquid inlet long hole; 33, second communication hole; 34, nozzle head. DETAILED DESCRIPTION

[0025] For the convenience of description, in the following description, in Figures 1 to 4In the middle, the nozzle 20, the ejector pin 21, and the left end of the gun body 14 are the "head", and the right end is the "tail".

[0026] Example 1

[0027] like Figures 1 to 4 As shown, a spray gun includes a rod-shaped gun body 14 and a cylindrical nozzle 20 threadedly connected to the head of the gun body 14. The head of the gun body 14 is cylindrical, the bottom of the remaining part is flat, and the upper right part is semi-cylindrical. A ejector pin 21 is slidably connected to the center of the gun body 14 along the axial direction. The ejector pin 21 and the gun body 14 are sealed together by a sealing ring. The head of the ejector pin 21 is hemispherical. The head of the nozzle 20 is a conical spray head 34. The nozzle 20 has a pressure chamber 30 communicating with the spray head 34. The head of the ejector pin 21 extends into the pressure chamber 30 and abuts against the inner side of the spray head 34.

[0028] The nozzle 20 is covered by a protective cap 13. The protective cap 13 has a through hole at the center of its left end. The left end of the nozzle 34 is located inside the through hole. The nozzle 20 has an outwardly protruding annular flange near its tail. The right end of the protective cap 13 is screwed into the head of the gun body 14 and is sealed to the gun body 14. The flange is sandwiched between the protective cap 13 and the gun body 14, thereby forming an annular first connecting cavity 27 between the gun body 13, the protective cap 13 and the nozzle 20.

[0029] The bottom surface of the gun body 14 near the tail is provided with two liquid inlet holes 15 and one liquid return hole 16. The pressure chamber 30, the liquid inlet holes 15 and the liquid return hole 16 are all connected to the first connecting chamber 27. The tail of the gun body 14 is provided with a drive mechanism for driving the ejector pin 21 to move axially.

[0030] An annular second connecting cavity 28 is provided between the head of the gun body 14 and the tail of the nozzle 20. Each liquid inlet hole 15 and the first connecting cavity 27 are connected by two elongated liquid inlet holes 32 arranged axially in the gun body 14. The two elongated liquid inlet holes 32 correspond one-to-one with the two liquid inlet holes 15. The two elongated liquid inlet holes and the second connecting cavity 28 are connected by radially arranged second connecting holes 33 on the gun body 14. The second connecting cavity 28 and the pressure chamber 30 are connected by four first connecting holes 29 arranged on the nozzle 20. The return hole 16 and the first connecting cavity 27 are connected by an elongated return hole 31 arranged axially in the gun body 14.

[0031] In actual use, the two liquid inlet holes 15 are connected with a liquid inlet pipeline respectively, and the liquid return hole 16 is connected with a liquid return pipeline. When the spray gun 2 stops working, the top pin 21 blocks the spray head 34, the paint in the paint bucket flows into the two liquid inlet holes 15 through the pump and the two liquid inlet pipelines, and then flows into the liquid return pipeline in sequence through the liquid inlet long hole 32, the first communication cavity 27, the liquid return long hole 31 and the liquid return hole 16, and then is sent to the paint bucket, thereby forming a circulation.

[0032] Since the paint always keeps flowing when the spray gun 2 stops working, the clogging phenomenon is not easy to occur.

[0033] When the driving mechanism pulls the top pin 21 to the right along the axial direction, the top pin 21 moves to the right, and a gap is formed between the left end of the top pin 21 and the spray head 34. Part of the paint under the pressure of the pump flows from the liquid inlet long hole 32 into the pressure cavity 30 in sequence through the second communication hole 33, the second communication cavity 28 and the first communication hole 29, and then is sprayed from the hole at the left end of the spray head 34 through the gap between the left end of the top pin 21 and the spray head 34. Since the liquid inlet hole 15 and the liquid inlet long hole 32 are both provided with two, and the liquid return long hole 31 and the liquid return hole 16 are both one, a pressure can be formed in the pressure cavity 30, thereby ensuring the normal work of the spray gun 2.

[0034] The bottom of the gun body 14 is also provided with a drain hole 26. When paint flows out of the drain hole 26, it indicates that the sealing ring on the top pin 21 has failed, and maintenance or replacement should be carried out as soon as possible.

[0035] Embodiment 2

[0036] The difference between this embodiment and embodiment 1 is that:

[0037] The driving mechanism comprises a piston 23 fixedly connected to the tail of the top pin 21 at the left end, the piston 23 is axially slidably connected with the gun body 14, the left part and the middle part of the piston 23 with larger diameter are both in sealing fit with the gun body 14 through a sealing ring, the bottom of the gun body 14 is provided with an air hole 17, the air hole 17 is in communication with the left side of the middle part of the piston 23, and the right side of the piston 23 is provided with a third spring 25 for applying a leftward elastic force to the piston 23.

[0038] The air hole 17 is connected with a compressed air pipeline through a solenoid valve. By controlling the solenoid valve and under the action of the third spring 25, the left and right movements of the piston 23 can be realized, and then the top pin 21 is driven to move left and right. The connection mode and the control mode of the air hole 17 and the solenoid valve are both prior art, and will not be described here.

[0039] The right end of the piston 23 is axially screwed with a second adjusting screw 24, the third spring 25 is sleeved outside the second adjusting screw 24, the tail of the gun body 14 is fixedly connected with a nut 18 through screwing, the center of the nut 18 is threadedly connected with a first adjusting screw 19, the first adjusting screw 19 abuts against the right end of the second adjusting screw 24, the left end of the third spring 25 abuts against the piston 23, and the right end abuts against the inner side of the nut 18, the piston 23 is internally provided with a second spring 22, the two ends of the second spring 22 abut against the piston 23 and the second adjusting screw 24 respectively, and the second adjusting screw 24 is prevented from loosening.

[0040] By adjusting the axial positions of the first adjusting screw 19 and the second adjusting screw 24, the axial displacement of the ejector pin 21 can be adjusted, and then the amount of paint sprayed by the spray head 34 can be adjusted, so that the width and clarity of the strokes sprayed by the spray gun 2 can be adjusted.

[0041] Embodiment 3

[0042] In combination Figures 5 to 7 As shown in the drawings, the embodiment discloses a printing head, which uses the spray gun 2 in embodiment 2, and further comprises a box body 1, a sliding sleeve 4 and a flange plate 6. The box body 2 is a deficient-angle rectangle, the gun body 14 and the sliding sleeve 4 are respectively fixedly connected perpendicularly on two adjacent and perpendicular sides of the box body 1, the tail of the gun body 14 extends into the box body 1, the flange plate 6 is fixedly connected on the side of the deficient angle of the box body 1, the axis of the spray head 34 and the axis of the sliding sleeve 4 are perpendicular to each other and located in the same plane, the angle bisector of the included angle between the axis of the spray head 34 and the axis of the sliding sleeve 4 coincides with the axis of the flange plate 6, the sliding sleeve 4 is slidably connected with a push rod 5 coaxial with the sliding sleeve 4, the box body 1 is fixedly connected with a travel switch 10 in the sliding direction of the push rod 5, and the box body 1 is provided with a first spring 8 for outward reset of the push rod 5.

[0043] The lower end of the push rod 5 is a conical flange, the large diameter of the flange is larger than the diameter of the upper part of the push rod 5, so that the axial position of the push rod 5 is limited.

[0044] The box body 1 is further provided with an electromagnetic valve 7, the electromagnetic valve 7 is a two-position three-way electromagnetic valve. The electromagnetic valve 7 is connected with the air hole 17 through an air pipe, and the connection mode and working principle thereof are prior art, which will not be described herein.

[0045] The box 1 is fixedly connected with a fixed rod 9, the fixed rod 9 is coaxial with the push rod 5, the fixed rod 9 is inserted into the push rod 5 and is in sliding fit with the push rod 5, the first spring 8 is sleeved outside the fixed rod 9, preventing the first spring 8 from falling off due to deformation. One end of the first spring 8 abuts against the push rod 5, and the other end abuts against the inner wall of the box 1. The spray gun 2 is further sleeved with a protection pipe 3 fixedly connected with the box 1, for protecting the spray gun 2. The electromagnetic valve 7 is fixedly arranged in the box 1, one side of the box 1 is provided with an inlet hole 12, and the box 1 is provided with a sleeve pipe 11 for leading the gas pipe and the electric wire into the box 1, for providing power supply and gas source for the electromagnetic valve 7.

[0046] Before use, the flange plate 6 is connected with the interface of the mechanical arm. When it is needed to spray marks on the outer circle of the steel roll, the outer end of the push rod 5 is vertically contacted with the surface of the steel roll under the driving of the mechanical arm, the box 1 is axially pushed by the mechanical arm along the push rod 5, when the flange of the conical platform on the push rod 5 abuts against the travel switch 10, the travel switch is actuated, the control system of the mechanical arm records the position parameters, the box 1 is driven by the mechanical arm to move away from the steel roll, the push rod 5 is separated from the steel roll, then the position parameters of two points are sequentially measured along the circumferential direction of the steel roll, the arc of the outer circle of the steel roll can be obtained according to the three position parameters, and thus the shape parameters of the arc surface of the outer circle of the steel roll to be marked can be obtained. Then the flange plate 6 is rotated by 180 degrees by the mechanical arm, the spray gun 2 is perpendicular to the surface of the steel roll, and spraying is performed. Since the position when the switch is actuated is the optimal distance between the spray gun and the steel roll, the marks can be kept consistent and clear during spraying.

[0047] When it is needed to spray on the end surface of the steel roll, three points are found on the end surface of the steel roll along the triangular track in the same way, the plane where the end surface of the steel roll is located is determined, and then spraying and marking are performed. Therefore, in the embodiment, spraying and marking can be realized on the outer circle and the end surface of the steel roll, the distance between the spray gun 2 and the steel roll during spraying can be determined by the push rod 5. In addition, it is not necessary to wait for the steel roll to cool to room temperature during spraying.

[0048] The above embodiment describes the content in more detail and concretely, expresses the preferred embodiment of the utility model, is used only for explaining the technical thought and characteristics of the utility model, and its purpose is to enable the person skilled in the art to understand the content of the utility model and to implement it, but is not limited to the utility model, and the patent range of the utility model cannot be limited to the embodiment, that is, any equivalent change or modification of the utility model disclosed by the utility model, the partial improvement of the system inside and the change, transformation between the subsystems, etc. without departing from the structure of the utility model, still belongs to the patent range of the utility model.

Claims

1. A spray gun, characterized in that, The gun includes a rod-shaped gun body (14) and a nozzle (20) connected to the head of the gun body (14). A pin (21) is slidably connected inside the gun body (14) along its length. The head of the nozzle (20) is a conical nozzle (34). A pressure chamber (30) communicating with the nozzle (34) is provided inside the nozzle (20). The head of the pin (21) extends into the pressure chamber (30) and abuts against the inside of the nozzle (34). The head of the gun body (14) is provided with a first communicating cavity (27). The gun body (14) is provided with an inlet hole (15) and a return hole (16) near the tail. The pressure chamber (30), the inlet hole (15) and the return hole (16) are all connected to the first communicating cavity (27). The tail of the gun body (14) is provided with a drive mechanism for driving the pin (21) to move axially.

2. A spray gun according to claim 1, characterized in that, The nozzle (20) is covered with a protective cap (13), which is connected to the head of the gun body (14). The protective cap (13) has a through hole, and the nozzle (34) is located inside the through hole. The first connecting cavity (27) is located between the gun body (14) and the protective cap (13), and the first connecting cavity (27) is located outside the nozzle (20).

3. A spray gun according to claim 1, characterized in that, The gun body (14) has an annular second connecting cavity (28) between its head and nozzle (20). The liquid inlet (15) and the first connecting cavity (27) are connected through a liquid inlet elongated hole (32). The liquid inlet elongated hole (32) and the second connecting cavity (28) are connected through a second connecting hole (33) provided on the gun body (14). The second connecting cavity (28) and the pressure chamber (30) are connected through a first connecting hole (29) provided on the nozzle (20). The liquid return hole (16) and the first connecting cavity (27) are connected through a liquid return elongated hole (31).

4. A spray gun according to claim 1, characterized in that, The drive mechanism includes a piston (23) with one end fixedly connected to the tail of the ejector pin (21). The piston (23) is axially slidably connected to the gun body (14). The piston (23) is sealed to the gun body (14). The gun body (14) is provided with an air hole (17). The air hole (17) is connected to the side of the piston (23) near the nozzle (20). The side of the piston (23) away from the nozzle (20) is provided with a third spring (25) for applying a spring force to the piston (23) in the direction of the nozzle (20).

5. A spray gun according to claim 4, characterized in that, The piston (23) has a second adjusting screw (24) threaded along the axial direction at the other end. The third spring (25) is sleeved on the second adjusting screw (24). The tail of the gun body (14) is fixedly connected to a nut (18). The nut (18) has a first adjusting screw (19) threaded through it. The first adjusting screw (19) abuts against the end of the second adjusting screw (24) away from the piston (23). One end of the third spring (25) abuts against the piston (23), and the other end abuts against the inside of the nut (18). The piston (23) is provided with a second spring (22). The two ends of the second spring (22) abut against the piston (23) and the second adjusting screw (24) respectively.

6. A printing head, characterized in that, The spray gun includes any one of claims 1 to 5, and further includes a housing (1), a sliding sleeve (4), and a flange (6). The gun body (14), the sliding sleeve (4), and the flange (6) are respectively fixedly connected to the side of the housing (1). The axis of the nozzle (34) and the axis of the sliding sleeve (4) are located in the same plane. The bisector of the angle between the axis of the nozzle (34) and the axis of the sliding sleeve (4) coincides with the axis of the flange (6). A push rod (5) is slidably connected through the sliding sleeve (4). A limit switch (10) is fixedly connected inside the housing (1) in the sliding direction of the push rod (5). A first spring (8) is provided inside the housing (1) for resetting the push rod (5) outward.

7. A printing head according to claim 6, characterized in that, The housing (1) is also equipped with a solenoid valve (7). A fixed rod (9) is fixedly connected inside the housing (1). The fixed rod (9) is coaxial with the push rod (5). The fixed rod (9) is inserted into the push rod (5) and slides with the push rod (5). The first spring (8) is sleeved on the outside of the fixed rod (9). One end of the first spring (8) abuts against the push rod (5), and the other end abuts against the inner wall of the housing (1).

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