Spray gun capable of automatically adjusting spraying amount

Abstract

A spray gun capable of automatically adjusting the spray quantity comprises a gun body, a nozzle cap, a barrel and a rear cover, a detachable nozzle is arranged between the gun body and the nozzle cap, the front end of the nozzle penetrates out of the nozzle cap and the nozzle, and a movably-arranged spray needle is arranged in the gun body. The nozzle has three modes of a non-spraying state, a normal working position state and a small-spraying-amount working position state through movement of the spraying needle, a kinetic energy assembly with gas as a power medium is arranged on the gun body and used for controlling movement of the spraying needle, and a limiting assembly is arranged between the barrel and the rear cover. The limiting assembly is used in cooperation with the spraying needle so that the position of the spraying needle can be kept when the nozzle is in the normal working position state or the small-spraying-amount working position state. The spray gun has the beneficial effects that the spray nozzle has three use modes by moving the spray needle to adjust the use position, so that the spray gun can be suitable for small-batch production and also suitable for large-batch production.

Description

Technical Field

[0001] The invention relates to the technical field of pharmaceutical equipment, in particular to a spray gun that automatically adjusts the spray volume. Background Art

[0002] The atomizing spray gun is an important component of the coating machine. It is used to atomize and spray the excipients so that the excipients can be attached to the surface of tablets, pills, etc. and form a film layer.

[0003] Publication (Announcement) No.: CN113477430B discloses an anti-bearding atomizing spray gun, including a gun body and a nozzle cap, a nozzle seat for connecting the gun body and the nozzle cap is arranged between the gun body and the nozzle cap, a slot is arranged at the front end of the nozzle seat, a detachable nozzle is arranged in the slot, a through hole is arranged on the nozzle cap, a convex column is arranged at the front end of the nozzle to cooperate with the through hole, a first jet port for supplying air to be ejected toward the front is formed between the through hole and the convex column, a jet port for ejecting auxiliary materials is arranged at the front end of the convex column, and a second jet port for tilting and converging toward the front position of the convex column is also arranged at the two sides of the nozzle cap corresponding to the convex column, and the surrounding side walls of the gun body are The first, second, and third gas source interfaces and auxiliary material interfaces are respectively provided, a first gas channel connected to the first gas source interface is formed between the gun body and the nozzle seat, a first air chamber connected to the first gas channel is formed between the nozzle, the nozzle seat and the nozzle cap, and the first air chamber is connected to the first jet port; a second gas channel connected to the second gas source interface is formed between the gun body and the nozzle seat, a second air chamber connected to the second gas channel is formed between the nozzle cap and the nozzle seat, and these second jet ports are connected to the second gas chamber, an auxiliary material channel connected to the jet port is formed between the nozzle, the nozzle seat and the gun body, and the auxiliary material channel is connected to the auxiliary material interface. This spray chamber cannot automatically adjust the spray volume, which results in a single production environment in which the equipment can be used, that is, it can only be used in a large-scale or small-scale production environment, and the equipment needs to adapt to another production environment can only be achieved by replacing a spray gun with a different spray volume. Summary of the invention

[0004] The present invention aims to solve the above-mentioned shortcomings of the prior art and provide a spray gun with automatic spray volume adjustment to solve the above-mentioned problems.

[0005] The present invention adopts a technical solution to solve its technical problems: this automatic spray volume adjustment spray gun includes a gun body, a nozzle cap, a barrel, and a rear cover. A detachable nozzle is arranged between the gun body and the nozzle cap, and the front end of the nozzle passes through the nozzle cap. A movably arranged spray needle is arranged in the nozzle and the gun body, so that the nozzle has three modes of non-spraying state, normal working position state, and small spray volume working position state through the movement of the spray needle. A kinetic energy component using gas as a power medium is arranged on the gun body, and the kinetic energy component is used to control the movement of the spray needle. A limit assembly is arranged between the barrel and the rear cover, and the limit assembly is used in conjunction with the spray needle to maintain the position of the spray needle when the nozzle is in the normal working position state or the small spray volume working position state.

[0006] Further improvement, a liquid flow cavity is formed between the nozzle and the spray needle, the liquid flow cavity is arranged in a stepped shape, and has a large diameter section, a middle diameter section, and a small diameter section. The large diameter section is in a linear configuration and is used to receive the auxiliary material liquid delivered by the liquid inlet joint to deliver the auxiliary material liquid to the middle diameter section, the middle diameter section is in a conical configuration and is used to guide the auxiliary material liquid into the small diameter section, the small diameter section is in a linear configuration and is used to guide the auxiliary material liquid to the injection port, when the spray needle is fully combined with the small diameter section, the nozzle is in a non-injection state, when it is partially combined with the small diameter section, the nozzle is in a small spray volume working position state, and when it is not combined with the small diameter section, the nozzle is in a normal working position state.

[0007] Further improvement, the front end of the spray needle and the small diameter section is in a conical configuration.

[0008] For further improvement, a moving cavity is formed between the gun body and the spray needle, the moving cavity is communicated with the installation space of the nozzle of the gun body, and a control cavity for receiving the gas delivered by the kinetic energy component is formed between the moving cavity and the spray needle to use the gas as a power medium to drive the spray needle to move.

[0009] For further improvement, the kinetic energy component includes an air passage arranged on the gun body and communicating with the control cavity, the air passage allows gas to enter into or leave the control cavity, and a first air source connector is arranged on the gun body.

[0010] For further improvement, a first spring is provided between the cylinder and the movable chamber, and the first spring can be compressed or reset along with the movement of the spray needle.

[0011] To be further improved, the limiting assembly includes a positioning plug and a second air source connector. The positioning plug is movably arranged in the cylinder and a protrusion is arranged at one end thereof close to the spray needle. The second air source connector is arranged on the rear cover and is located below the positioning plug.

[0012] For further improvement, a second spring is provided between the cylinder body and the rear cover, and the second spring can be stretched or reset along with the movement of the positioning plug.

[0013] Further improvement, the configuration of the spray needle is consistent with the configuration of the limit assembly.

[0014] The beneficial effects of the present invention are: The nozzle of the present invention has three usage modes: a non-spraying state, a normal working position state, and a small-spraying-volume working position state, all of which are achieved by moving the spray needle to adjust the usage position. When in the non-spraying state, the nozzle does not spray liquid. When in the normal working position state, the spray amount of the nozzle is a normal spray amount, which is suitable for mass production. When in the small-spraying-volume working position state, the spray amount of the nozzle is a small spray amount, which is suitable for small-batch production. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the present invention; Figure 2 It is a schematic diagram of the structure of the nozzle of the present invention; Figure 3 It is a structural schematic diagram of the other side of the present invention; Figure 4 This is a schematic diagram of the present invention in a normal working position; Figure 5 It is a schematic diagram of the use state of the present invention in a small spray volume working position.

[0016] Explanation of the accompanying drawings: gun body 1, moving chamber 11, control chamber 111, nozzle cap 2, cylinder 3, rear cover 4, nozzle 5, liquid chamber 51, large diameter section 511, middle diameter section 512, small diameter section 513, spray needle 6, kinetic energy component 7, air passage 71, limit component 8, positioning plug 81, upper protrusion 811, lower protrusion 812, second air source connector 82, first air source connector 9, first spring 10, second spring 20. DETAILED DESCRIPTION

[0017] The present invention will be further described below in conjunction with the accompanying drawings: Referring to the accompanying drawings: This automatic spray gun for adjusting the spray volume includes a gun body 1, a nozzle cap 2, a barrel 3, and a rear cover 4. A detachable nozzle 5 is arranged between the gun body 1 and the nozzle cap 2. The front end of the nozzle 5 passes through the nozzle cap 2. A movably arranged spray needle 6 is arranged in the nozzle 5 and the gun body 1, so that the nozzle 5 has three modes of non-spraying state, normal working position state, and small spray volume working position state through the movement of the spray needle 6. A kinetic energy component 7 with gas as a power medium is arranged on the gun body 1. The kinetic energy component 7 is used to control the movement of the spray needle 6. A limit component 8 is arranged between the barrel 3 and the rear cover 4. The limit component 8 uses gas as a power medium to realize its own movement, and is used in conjunction with the spray needle 6 to keep the position of the spray needle 6 when the nozzle 5 is in the normal working position state or the small spray volume working position state. The principle of the present invention is that the nozzle 5 has three usage modes, namely, a non-spraying state, a normal working position state, and a small-spraying-volume working position state, all of which are realized by the use position of the spray needle 6. When in the non-spraying state, the nozzle 5 does not spray liquid. When in the normal working position state, the spray amount of the nozzle 5 is a normal spray amount, which is suitable for mass production. When in the small-spraying-volume working position state, the spray amount of the nozzle 5 is a small spray amount, which is suitable for small-batch production. The movement of the spray needle 6 is realized by the kinetic energy component 7. The kinetic energy component 7 uses gas as a power medium, and drives the spray needle 6 to move backward by acting on the spray needle 6 through the gas. The limit component 8 is used to limit the use position of the spray needle 6. When the nozzle 5 is in the normal working position state or the small-spraying-volume working position state, it is used in conjunction with the spray needle 6. The limit component 8 also uses gas as a power medium, thereby realizing the use of two gases to form an antagonism, and using the antagonism to prevent the spray needle 6 from continuing to move.

[0018] A liquid flow cavity 51 is formed between the nozzle 5 and the spray needle 6. The liquid flow cavity 51 is arranged in a stepped shape and has a large diameter section 511, a middle diameter section 512, and a small diameter section 513. The large diameter section 511 is in a straight line configuration and is used to receive the auxiliary material liquid delivered by the liquid inlet joint to deliver the auxiliary material liquid to the middle diameter section 512. The middle diameter section 512 is in a conical configuration and is used to guide the auxiliary material liquid into the small diameter section 513. The small diameter section 513 is in a straight line configuration and is used to guide the auxiliary material liquid to the injection port. The spray needle 6 and the small diameter section 513 are arranged in a straight line configuration. When the nozzle 5 is fully combined with the small diameter section 513, it is in a non-spraying state; when it is partially combined with the small diameter section 513, it is in a small spraying working position; when it is not combined with the small diameter section 513, it is in a normal working position. Such an arrangement makes the liquid flow cavity 51 directional, and as the volume of the liquid flow cavity 51 decreases, the mobility of the auxiliary material liquid can be improved by being squeezed, so that the spraying intensity of the auxiliary material liquid can be improved. The increased intensity also increases the spraying distance and the coverage range, thereby improving the coating effect.

[0019] The front end of the spray needle 6 that cooperates with the small diameter section 513 is in a conical configuration. Such a configuration allows the front end portion of the spray needle 6 to be placed in the small diameter section 513, which will not block the entrance of the small diameter section 513, and can also reduce the diameter of the entrance of the small diameter section 513, thereby reducing the amount of liquid entering the small diameter section 513, and the inclined surface formed by the conical configuration can also play a guiding role.

[0020] A moving chamber 11 is formed between the gun body 1 and the spray needle 6. The moving chamber 11 is communicated with the installation space of the nozzle 5 of the gun body 1. A control chamber 111 for receiving the gas delivered by the kinetic energy component 7 is formed between the moving chamber 11 and the spray needle 6, so that the gas is used as a power medium to push the spray needle 6 to move. The moving chamber 11 allows the spray needle 6 to move in the gun body 1, and it has a large diameter section and a small diameter section through a stepped configuration. The control chamber 111 is formed in the large diameter section, and is formed together with the large diameter section of the moving chamber 11 by the part of the spray needle 6 existing in the large diameter section, so that the gas can act on the spray needle 6 after entering, as follows: When the nozzle 5 is in a non-spraying state, the kinetic energy component 7 and the limit component 8 are both not ventilated, and at this time, the front end of the spray needle 6 remains in a state of being combined with the small-diameter section 513; When the nozzle 5 is in the normal working position, the kinetic energy component 7 uses gas as a power medium to introduce gas into the control chamber 111 and pushes the spray needle 6 to move backward so that the front end of the spray needle 6 leaves the small diameter section 513. The limiting component 8 uses gas as a power medium to move forward and abut against the spray needle 6, so that the backward movement distance of the spray needle 6 can be limited, and the front end of the spray needle 6 is not combined with the small diameter section 513. When the nozzle 5 is in the small spray volume working position, the kinetic energy component 7 introduces gas into the control chamber 111 through gas as the power medium and pushes the spray needle 6 forward. The limiting component 8 uses gas as the power medium to realize its own forward movement and abut against the spray needle 6. The time of injecting gas is slightly later than the time of injecting gas when the nozzle 5 is in the normal working position. The front end part of the spray needle 6 is combined with the small diameter section 513.

[0021] The kinetic energy component 7 includes an air passage 71 which is arranged on the gun body 1 and communicates with the control chamber 111. The air passage 71 allows gas to enter or leave the control chamber 111. The air passage 71 is provided with a first air source connector 9 on the gun body 1. The air passage 71 is communicated with the control chamber 111, and the first air source connector 9 provided on the gun body 1 of the air passage 71 is connected to an external air supply device. In this way, when the spray needle 6 is pushed to move, the gas can reach the control chamber 111 through the air passage 71, and also allow the gas to flow back after the gas is cut off. In the air intake stage, when the gas cannot leave the control chamber 111, a resistance can be formed. While the resistance prevents the spray needle 6 from resetting, it also forms an opposition with the gas used to drive the limit component 8 to move, thereby achieving a positioning effect.

[0022] A first spring 10 is provided between the cylinder 3 and the movable chamber 11. The first spring 10 can be compressed or reset as the spray needle 6 moves. The first spring 10 has an auxiliary reset effect, that is, when the spray needle 6 moves in the opening direction, the first spring 10 is compressed and deformed, so that elasticity can be generated. After the gas serving as the power medium disappears, the elasticity restores the first spring 10 to its initial state, thereby also pushing the spray needle 6 to move in the closing direction, that is, the front end of the spray needle 6 completely enters the small diameter section 513.

[0023] The limiting assembly 8 includes a positioning plug 81 and a second gas source connector 82. The positioning plug 81 is movably arranged in the cylinder 3 and an upper protrusion 811 is arranged at one end thereof close to the spray needle 6. The second gas source connector 82 is arranged on the rear cover 4 and is located below the positioning plug 81. The positioning plug 81 is used in conjunction with gas and moves in the cylinder 3. The second gas source connector 82 is used to connect with an external ventilation device to output gas to the positioning plug 81. The upper protrusion 811 is used in conjunction with the spray needle 6 and abuts against it, and can reduce the moving distance of the spray needle 6 by using its own length.

[0024] A second spring 20 is provided between the cylinder 3 and the rear cover 4. The second spring 20 can be stretched or reset as the positioning plug 81 moves. The function of the second spring 20 is consistent with that of the first spring 10, and is used to assist the positioning plug 81 in resetting. A lower protrusion 812 is provided at one end of the positioning plug 81 away from the spray needle 6, and the lower protrusion 812 is used to be plugged in and matched with the second spring 20.

[0025] The configuration of the spray needle 6 is consistent with that of the limiting component 8. The only difference between the two is the upper protrusion 811. The difference lies in the length and shape. The upper protrusion of the spray needle 6 is a conical configuration, which is convenient for cooperation with the small diameter section 513 of the liquid chamber 51, while the upper protrusion of the limiting component 8 is a cylindrical configuration, so that the contact area with the positioning plug of the spray needle 6 is larger, which increases the abutment stability. At the same time, sealing rings are provided on the positioning plug and the upper protrusion of the spray needle 6, which can prevent air from being mixed and avoid the fusion of the auxiliary material liquid and the gas.

[0026] Although the present invention has been shown and described with reference to preferred embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein within the scope of the claims.

Claims

1. A spray gun with automatic spray volume adjustment, comprising a gun body (1), a nozzle cap (2), a barrel (3), and a rear cover (4), characterized in that: A detachable nozzle (5) is arranged between the gun body (1) and the nozzle cap (2), the front end of the nozzle (5) passes through the nozzle cap (2), and a movably arranged spray needle (6) is arranged in the nozzle (5) and the gun body (1), so that the nozzle (5) has three modes of non-spraying state, normal working position state, and small spraying amount working position state through the movement of the spray needle (6). A kinetic energy component (7) using gas as a motive medium is arranged on the gun body (1), and the kinetic energy component (7) is used to control the movement of the spray needle (6). A movable limit component (8) is arranged between the barrel (3) and the rear cover (4), and the limit component (8) uses gas as a motive medium to realize its own movement, and is used in conjunction with the spray needle (6) to maintain the position of the spray needle (6) when the nozzle (5) is in the normal working position state or the small spraying amount working position state.

2. The automatic spray gun according to claim 1, characterized in that: A liquid flow cavity (51) is formed between the nozzle (5) and the spray needle (6). The liquid flow cavity (51) is arranged in a stepped shape and comprises a large diameter section (511), a middle diameter section (512), and a small diameter section (513). The large diameter section (511) is in a linear configuration and is used to receive auxiliary material liquid delivered by the liquid inlet joint so as to deliver the auxiliary material liquid to the middle diameter section (512). The middle diameter section (512) is in a conical configuration and is used to guide the auxiliary material liquid into the small diameter section (513). The small diameter section (513) is in a linear configuration and is used to guide the auxiliary material liquid to the spray port. When the spray needle (6) is completely combined with the small diameter section (513), the nozzle (5) is in a non-spraying state; when the spray needle (6) is partially combined with the small diameter section (513), the nozzle (5) is in a small spraying amount working position state; when the spray needle (6) is not combined with the small diameter section (513), the nozzle (5) is in a normal working position state.

3. The automatic spray gun according to claim 2, characterized in that: The front end of the spray needle (6) that cooperates with the small-diameter section (513) has a conical configuration.

4. The automatic spray gun according to claim 3, characterized in that: A moving chamber (11) is formed between the gun body (1) and the spray needle (6), the moving chamber (11) being in communication with a mounting space of the gun body (1) for arranging the nozzle (5), and a control chamber (111) for receiving gas delivered by the kinetic energy component (7) is formed between the moving chamber (11) and the spray needle (6), so as to use the gas as a motive medium to propel the spray needle (6) to move.

5. The automatic spray gun according to claim 4, characterized in that: The kinetic energy component (7) comprises an air passage (71) arranged on the gun body (1) and communicating with the control chamber (111), wherein the air passage (71) allows gas to enter into or leave the control chamber (111), and the air passage (71) is provided with a first air source connector (9) on the gun body (1).

6. The automatic spray gun for adjusting the spray volume according to claim 5, characterized in that: A first spring (10) is provided between the cylinder (3) and the movable chamber (11), and the first spring (10) can be compressed or reset as the spray needle (6) moves.

7. The automatic spray gun according to claim 1, characterized in that: The limiting assembly (8) comprises a positioning plug (81) and a second air source connector (82); the positioning plug (81) is movably arranged in the cylinder (3) and an upper protrusion (811) is arranged at one end thereof close to the spray needle (6); and the second air source connector (82) is arranged on the rear cover (4) and is located below the positioning plug (81).

8. The automatic spray volume adjustment spray gun according to claim 7, characterized in that: A second spring (20) is provided between the cylinder (3) and the rear cover (4), and the second spring (20) can be stretched or reset as the positioning plug (81) moves.

9. The automatic spray gun for adjusting the spray volume according to claim 8, characterized in that: The configuration of the spray needle (6) is consistent with the configuration of the limiting component (8).

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