A handle-type spray gun attachment with a child lock function

Abstract

A handle type spray gun accessory with a child lock function, comprising a spray gun shell, which has a mounting cavity inside; a nozzle pipe, the front end of which extends out of the spray gun shell; a steam inlet pipe; a guide pipe connected with the steam inlet pipe and in communication; an on-off valve connected between the guide pipe and the nozzle pipe; a trigger switch movably connected to the spray gun shell, and the trigger switch and the on-off valve form; a child lock switch movably arranged in the mounting cavity in the longitudinal direction; the child lock switch comprises a switch body, an unlocking section, a locking section, a stop section and an operation section; the operation section at least partially extends out of the spray gun shell; an activity space is formed between the unlocking section and the trigger switch, and the locking section and the trigger switch form a limit locking fit. The child lock switch with higher self-structure integration and one-piece forming has high stability and reliability, so that the design freedom of the spray gun shell structure space is larger, and the area occupied by the spray gun shell is smaller.

Description

Technical Field

[0001] This utility model relates to the technical field of steam spray gun accessories, and in particular to a handle-type spray gun accessory with a child lock function. Background Technology

[0002] Steam cleaning, also known as supersaturated steam cleaning, is a cleaning method. Using saturated steam under high temperature and pressure, it dissolves and vaporizes oil particles on the surface being cleaned, achieving a super-clean state. Simultaneously, supersaturated steam can effectively penetrate any tiny pores and cracks, peeling off and removing stains and residues. A high-pressure steam cleaner is a steam generator used for cleaning oil stains; it contains a steam generator that converts liquid into high-temperature steam when powered. This high-temperature steam is discharged through a steam pipe from the end furthest from the machine, effectively cleaning stubborn oil stains at high temperatures. In existing product designs, users typically control the steam function, including turning it on / off and adjusting the flow rate, using a push-button control handle.

[0003] Because the steam emitted by this type of steam cleaning is at a relatively high temperature, a child lock mechanism is incorporated into the equipment for safety reasons, to prevent accidental activation, especially by children. When the child lock mechanism is engaged, the control handle cannot be pressed, thus preventing steam from being emitted. However, existing child lock mechanisms have a certain drawback: their locking function requires manual operation to deactivate. If the user forgets to deactivate the lock after use, the safety hazard remains. Summary of the Invention

[0004] In order to overcome the above-mentioned shortcomings of the prior art, this utility model provides a handle-type spray gun accessory with a child lock function.

[0005] The technical solution of this utility model to solve its technical problem is: a handle-type spray gun accessory with a child lock function, comprising:

[0006] The spray gun housing has an internal mounting cavity, with one end of the spray gun housing being the steam inlet end and the other end being the steam outlet end;

[0007] A nozzle tube is disposed in the mounting cavity, and the front end of the nozzle tube extends out of the spray gun housing through the steam outlet end;

[0008] A steam inlet pipe, which is disposed at the steam inlet end;

[0009] The conduit connects to and is open to the steam inlet pipe;

[0010] The on / off valve connects the conduit and the nozzle tube.

[0011] A trigger switch is movably connected to the spray gun housing, and the trigger switch forms an on / off valve;

[0012] It also includes a child lock switch, which is movably disposed in the mounting cavity along the longitudinal direction;

[0013] The child lock switch includes a switch body, an unlocking section, a locking section, and a stopping section protruding longitudinally from the switch body, and an operating section protruding from the switch body; wherein, the operating section extends at least partially outside the spray gun housing; the unlocking section and the trigger switch form a movable space; the locking section and the trigger switch form a limiting locking engagement; and the stopping section can abut against the inner wall of the spray gun housing and form a limiting engagement.

[0014] The above-mentioned technical solution employs a child lock switch with a higher degree of structural integration. The switch body, unlocking section, locking section, stopping section, and operating section are all integrally molded, thus possessing absolute stability and reliability in structure, completely eliminating defects such as misalignment and transmission obstruction that may exist in separate components. On the other hand, due to the high degree of integration of the child lock switch in this disclosure, its overall size is small and most of its structure is located inside the mounting cavity of the spray gun housing, with only the operating section exposed outside the spray gun housing. Moreover, the operating section adopts a push-type design, so the size of the operating section can be made very small, allowing for greater design freedom in the structure space of the spray gun housing, and its area occupied by the operating section is small (almost negligible), resulting in a more harmonious and aesthetically pleasing appearance.

[0015] Optionally, the spray gun housing has a limiting rib, and the limiting rib and the trigger switch form a receiving area, and the child lock switch is movably disposed in the receiving area.

[0016] In a preferred embodiment of the present invention, the spray gun housing has a baffle plate, the baffle plate is provided with a fixed baffle rib, and the child lock switch includes a baffle section protruding on the switch body, and the baffle section is provided with a plurality of baffle grooves along the longitudinal direction.

[0017] The user controls the child lock switch to move longitudinally by operating the section, so that the fixed position rib can be locked into any one of the position slots.

[0018] In a preferred embodiment of this utility model, the spray gun housing has a fixing block, and a first reset spring is provided between the fixing block and the trigger switch;

[0019] The trigger switch has a first contact at its front end that interacts with the on / off valve;

[0020] The trigger switch has a second contact at its rear end that interacts with the child lock switch;

[0021] The trigger switch has a rotating shaft on its side wall, and the trigger switch rotates with the spray gun housing through the rotating shaft.

[0022] Preferably, the spray gun housing has a hand-held through hole, which divides the mounting cavity into an upper half and a lower half. The trigger switch and child lock switch are both located in the upper half, and the conduit is located in the lower half.

[0023] In a preferred embodiment of this utility model, the on / off valve includes a valve body and a valve core assembly;

[0024] The valve body has a small-diameter cavity, a large-diameter cavity, and a steam inlet cavity. The steam inlet cavity is connected to the small-diameter cavity through a manifold. The small-diameter cavity is connected to the large-diameter cavity through an open / closed port. The conduit is connected to and conducts through the steam inlet cavity. The nozzle tube is connected to and conducts through the large-diameter cavity.

[0025] The valve core assembly is disposed in the small-diameter cavity, the rear end of the valve core assembly extends out of the valve body and forms a transmission engagement with the trigger handle, the front end of the valve core assembly extends into the large-diameter cavity, and the valve core assembly acts on the opening and closing port to conduct or block the small-diameter cavity and the large-diameter cavity.

[0026] Furthermore, the valve core assembly includes a valve stem, a second return spring, a first sealing ring, and a sealing valve core;

[0027] The valve stem is inserted into the small-diameter cavity.

[0028] The second return spring abuts against the inner wall of the valve stem and the valve body;

[0029] The first sealing ring is fitted onto the valve stem, and the valve stem forms a sealing fit with the inner wall of the valve body through the first sealing ring;

[0030] The sealing valve core is installed at the front end of the valve stem, the sealing valve core is located in the large-diameter cavity, and the radial dimension of the sealing valve core is greater than the radial dimension of the opening and closing port.

[0031] More specifically, the rear end of the nozzle tube is fitted with several second sealing rings, and the nozzle tube forms a sealing fit with the inner wall of the large-diameter cavity through the second sealing rings.

[0032] In a preferred embodiment of the present invention, the spray gun housing is further provided with a connecting block, the connecting block having a pressing section and a connecting section;

[0033] The spray gun housing has a groove, and the connecting section is movably disposed in the groove, and the connecting section is used to connect external accessories.

[0034] A third return spring is provided between the pressing section and the spray gun housing.

[0035] In this invention, a rubber sleeve is provided at the connection between the steam inlet pipe and the conduit.

[0036] The beneficial effects of this utility model are as follows: It adopts a child lock switch with a higher degree of structural integration, in which the switch body, unlocking section, locking section, stopping section and operating section are integrally molded parts. Therefore, it has absolute stability and reliability in structure, completely eliminating the defects such as connection misalignment and transmission obstruction that may exist in separate parts. On the other hand, due to the high degree of integration of the child lock switch in this disclosure, its overall size is small and most of the structure is located inside the mounting cavity of the spray gun housing. Only the operating section is exposed outside the spray gun housing. Moreover, the operating section adopts a push-type design, so the size of the operating section can be made very small, which makes the design of the spray gun housing structure space more flexible, and its area occupied by the spray gun housing is small (almost negligible), thus making the appearance more harmonious and beautiful. Attached Figure Description

[0037] Figure 1 This is a schematic diagram of the appearance structure of this utility model.

[0038] Figure 2 This is a schematic diagram of the internal structure of this utility model.

[0039] Figure 3 This is an exploded view of the structure of this utility model.

[0040] Figure 4 This is a comparative diagram showing the child lock switch before and after operation in this utility model.

[0041] Figure 5 This is a diagram showing the child lock switch and trigger switch before and after operation.

[0042] Figure 6 This is a partial structural cross-sectional view of the on / off valve when it blocks the small-diameter cavity and the large-diameter cavity.

[0043] Figure 7 This is a partial structural cross-sectional view of the on / off valve when the small-diameter cavity and the large-diameter cavity are open.

[0044] Figure 8 This is a structural cross-sectional view of the present invention.

[0045] Figure 9 This is a partial structural diagram of the gear shift plate and gear shift section when they are in operation.

[0046] Figure 10 This is a schematic diagram of the child lock switch.

[0047] Figure 11This is a schematic diagram of the trigger switch.

[0048] In the diagram: 1. Spray gun housing; 11. Mounting cavity; 111. Upper half; 112. Lower half; 12. Steam inlet end; 13. Steam outlet end; 14. Limiting rib; 141. Accommodation area; 15. Stop plate; 151. Stopping rib; 16. Fixing block; 17. Handheld through hole; 18. Groove; 2. Nozzle pipe; 21. Second sealing ring; 3. Steam inlet pipe; 31. Rubber sleeve; 4. Guide tube; 5. On / off valve; 51. Valve body; 511. Small diameter cavity; 512. Large diameter cavity; 513. Steam inlet cavity; 514. Manifold; 515. Opening / closing port; 52. Valve core assembly; 521, valve stem; 522, second return spring; 523, first sealing ring; 524, sealing valve core; 53, air guide gap; 6, trigger switch; 61, rotating shaft; 62, first return spring; 63, first contact; 64, second contact; 7, child lock switch; 71, switch body; 72, unlocking section; 721, moving space; 73, locking section; 74, stopping section; 75, operating section; 76, gear section; 761, gear slot; 8, connecting block; 81, pressing section; 82, connecting section; 83, third return spring. Detailed Implementation

[0049] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. It should be noted that the embodiments are merely specific descriptions of the present invention, and their purpose is to enable those skilled in the art to better understand the technical solution of the present invention, and should not be regarded as limitations on the present invention.

[0050] In the description of this utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0051] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0052] Example 1

[0053] Reference Figures 1 to 11 A handle-type spray gun accessory with a child lock function includes: a spray gun housing 1, which has an internal mounting cavity 11, one end of the spray gun housing 1 being a steam inlet end 12 and the other end being a steam outlet end 13; a nozzle tube 2, which is disposed in the mounting cavity 11, and the front end of the nozzle tube 2 extends out of the spray gun housing 1 through the steam outlet end 13; a steam inlet pipe 3, which is disposed at the steam inlet end 12; a conduit 4, which is connected to and conducts through the steam inlet pipe 3; an on / off valve 5, which is connected between the conduit 4 and the nozzle tube 2; and a trigger switch 6, which is movably connected to the spray gun housing 1, and the trigger switch 6 forms an on / off valve 5; and also includes The device includes a child lock switch 7, which is movably disposed longitudinally in the mounting cavity 11. The child lock switch 7 includes a switch body 71, an unlocking section 72, a locking section 73, and a stopping section 74 protruding longitudinally from the switch body 71, and an operating section 75 protruding from the switch body 71. The operating section 75 extends at least partially beyond the spray gun housing 1. An active space 721 is formed between the unlocking section 72 and the trigger switch 6. The locking section 73 forms a limiting locking engagement with the trigger switch 6. The stopping section 74 can abut against the inner wall of the spray gun housing 1 and form a limiting engagement.

[0054] The above-mentioned technical solution adopts a child lock switch 7 with a higher degree of structural integration. The switch body 71, unlocking section 72, locking section 73, stopping section 74 and operating section 75 are integrally molded parts. Therefore, it has absolute stability and reliability in structure, completely eliminating the defects such as connection misalignment and transmission obstruction that may exist in split parts. On the other hand, due to the high degree of integration of the child lock switch 7 in this disclosure, its overall size is small and most of its structure is located inside the mounting cavity 11 of the spray gun housing 1. Only the operating section 75 is exposed outside the spray gun housing 1. Moreover, the operating section 75 adopts a push-type design. Therefore, the size of the operating section 75 can be made very small, which makes the design of the structural space of the spray gun housing 1 more flexible, and its area occupied by the spray gun housing 1 is small (almost negligible), resulting in a more harmonious and beautiful appearance.

[0055] Preferably, refer to Figure 1 The child lock switch 7 is positioned diagonally above the trigger switch 6, a distribution that is more ergonomic. Specifically, when the user holds the spray gun housing 1 and operates the trigger switch 6, the thumb can easily rest on the child lock switch 7, facilitating (one-handed) operation.

[0056] Optionally, refer to Figure 9The spray gun housing 1 has a limiting rib 14, and the limiting rib 14 and the trigger switch 6 form a receiving area 141. The child lock switch 7 is movably disposed in the receiving area 141, and the receiving area 141 is used to accommodate the child lock switch 7 and limit the range of motion of the child lock switch 7.

[0057] Reference Figure 9 In a preferred embodiment of this utility model, the spray gun housing 1 has a stop plate 15, on which a stop rib 151 is provided. The child lock switch 7 includes a stop section 76 protruding from the switch body 71, on which a plurality of stop grooves 761 are formed longitudinally. The user controls the child lock switch 7 to move longitudinally through the operation section 75, so that the stop rib 151 can be engaged into any one of the stop grooves 761. The cooperation between the stop rib 151 and the stop grooves 761 provides a certain degree of support and limitation, preventing the child lock switch 7 from moving and switching functions without human operation, thus preventing misoperation and improving safety. It should be noted that the fixed-position rib 151 and the gear section 76 (the part not in the gear slot 761) form an interference fit. Therefore, when switching gears, a force needs to be applied manually to overcome the resistance so that the child lock switch 7 can move. This allows the fixed-position rib 151 to move from one gear slot 761 to another gear slot 761, thereby achieving the function of locking or releasing the trigger switch 6.

[0058] In a preferred embodiment of this utility model, referring to Figure 2 The spray gun housing 1 has a fixing block 16, and a first return spring 62 is provided between the fixing block 16 and the trigger switch 6. With the first return spring 62, after the user releases the trigger switch 6, the elastic force of the first return spring 62 can automatically reset the trigger switch 6. The front end of the trigger switch 6 has a first contact 63 that interacts with the on / off valve 5. The first contact 63 protrudes further forward than the overall trigger switch 6. This ensures that the first contact 63 can smoothly contact the on / off valve 5 and achieve transmission, and also prevents unnecessary physical interference between the trigger switch 6 (the part not containing the first contact 63) and the on / off valve 5, thus preventing normal operation. The trigger switch 6 has a second contact 64 at its rear end that interacts with the child lock switch 7. Similarly, the second contact 64 protrudes further back than the entire trigger switch 6. This is to ensure that the second contact 64 can smoothly contact the child lock switch 7 and cooperate, and to prevent unnecessary physical interference between the trigger switch 6 (the part other than the second contact 64) and the child lock switch 7, which would prevent it from working properly.

[0059] Preferably, refer to Figure 11The trigger switch 6 has a rotating shaft 61 on its side wall, and the trigger switch 6 is rotatably engaged with the spray gun housing 1 through the rotating shaft 61. When the user presses the trigger switch 6, the trigger switch 6 rotates about the rotating shaft 61 as the rotation center.

[0060] Reference Figure 2 In this utility model, a rubber sleeve 31 is fitted at the connection between the steam inlet pipe 3 and the conduit 4. The rubber sleeve 31 is mainly designed to meet multiple needs, including buffering, heat insulation, and convenient installation. Specifically, it serves several purposes: First, it adapts to pressure changes. In a steam system, the rubber sleeve 31 can adapt to pressure fluctuations within the pipe through elastic deformation, preventing seal failure due to pressure changes, ensuring stable system pressure, and reducing energy loss. Second, it absorbs vibration energy. Steam pipes may vibrate due to medium flow or equipment operation. The elastic material of the rubber sleeve 31 can absorb vibration energy, reducing rigid collisions between the steam inlet pipe 3 and the conduit 4, and preventing problems such as loose bolts and pipe cracks at the connection due to long-term vibration. Third, it alleviates thermal expansion and contraction stress. Steam pipes experience thermal expansion and contraction during alternating hot and cold periods. The flexible properties of the rubber sleeve 31 can buffer the stress generated by pipe deformation, preventing damage at the connection due to stress concentration and extending the service life of the pipe. Fourth, it provides heat insulation, improving safety and energy efficiency.

[0061] Example 2

[0062] Reference Figure 8 In this embodiment, the spray gun housing 1 has a handheld through hole 17, which divides the mounting cavity 11 into an upper half 111 and a lower half 112. The trigger switch 6 and the child lock switch 7 are both located in the upper half 111, and the conduit 4 is located in the lower half 112.

[0063] The handheld through-hole 17 facilitates the user's grip on the spray gun housing 1. Furthermore, the handheld through-hole 17 rationally divides the internal space of the mounting cavity 11 into an upper section 111 (dynamic zone) and a lower section 112 (static zone). Components such as the trigger switch 6 and child lock switch 7 in the upper section 111 (dynamic zone) will change position during use; however, the conduit 4 in the lower section 112 (static zone) will not change position during use. Therefore, this zoning prevents the movement of components such as the trigger switch 6 and child lock switch 7 from contacting or interfering with the conduit 4, ensuring that the conduit 4 maintains a stable shape and guarantees smooth steam flow.

[0064] Example 3

[0065] Reference Figures 6-8In a preferred embodiment of this utility model, the on / off valve 5 includes a valve body 51 and a valve core assembly 52. ​​The valve body 51 has a small-diameter cavity 511, a large-diameter cavity 512, and a steam inlet cavity 513. The steam inlet cavity 513 is connected to the small-diameter cavity 511 via a manifold 514. The small-diameter cavity 511 is connected to the large-diameter cavity 512 via an opening / closing port 515. The conduit 4 is connected to and conducts through the steam inlet cavity 513. The nozzle pipe 2 is connected to and conducts through the large-diameter cavity 512. The valve core assembly 52 is disposed in the small-diameter cavity 511. The rear end of the valve core assembly 52 extends outside the valve body 51 and forms a transmission engagement with the trigger handle. The front end of the valve core assembly 52 extends into the large-diameter cavity 512. The valve core assembly 52 acts on the opening / closing port 515 to conduct or block the small-diameter cavity 511 and the large-diameter cavity 512.

[0066] When the user pulls the trigger switch 6, the trigger switch 6 moves the valve core assembly 52 forward, thereby forming a gas guide gap 53 between the valve core assembly 52 and the opening / closing port 515. This gap allows the small-diameter cavity 511 and the large-diameter cavity 512 to pass through, allowing steam in the conduit 4 to enter the nozzle pipe 2 through the small-diameter cavity 511 and the large-diameter cavity 512, and then be ejected outward from the front end of the nozzle pipe 2. When the user releases the trigger switch 6, the trigger switch 6 resets backward under the action of the first return spring 62, and the valve core assembly 52 resets backward under the action of the second return spring 522. This causes the valve core assembly 52 to re-seal the opening / closing port 515, blocking the small-diameter cavity 511 and the large-diameter cavity 512. Consequently, steam in the conduit 4 will not enter the nozzle pipe 2, nor will it be ejected outward.

[0067] Furthermore, the valve core assembly 52 includes a valve stem 521, a second return spring 522, a first sealing ring 523, and a sealing valve core 524. The valve stem 521 passes through the small-diameter cavity 511; it should be noted that the front end of the valve stem 521 will enter the large-diameter cavity 512 to cooperate with the sealing valve core 524. The second return spring 522 abuts against the inner wall of the valve stem 521 and the valve body 51. The valve body 51 is a fixed component, while the valve stem 521 is a movable component; therefore, the second return spring 522 can act on the valve stem 521 so that the sealing valve core 524 on the valve stem 521 always has a sealing function. The movement trend of the closed port 515; the first sealing ring 523 is sleeved on the valve stem 521, and the valve stem 521 forms a sealing fit with the inner wall of the valve body 51 through the first sealing ring 523 to prevent steam from leaking out backward; the sealing valve core 524 is installed at the front end of the valve stem 521, the sealing valve core 524 is located in the large-diameter cavity 512, and the radial dimension of the sealing valve core 524 is larger than the radial dimension of the open and closed port 515, ensuring that the sealing valve core 524 can completely block the open and closed port 515.

[0068] Optionally, a plurality of second sealing rings 21 are fitted at the rear end of the nozzle tube 2. The nozzle tube 2 forms a sealing fit with the inner wall of the large-diameter cavity 512 through the second sealing rings 21 to ensure that steam does not leak out from between the rear end of the nozzle tube 2 and the inner wall of the large-diameter cavity 512.

[0069] Example 4

[0070] Reference Figures 1-3 In a preferred embodiment of this utility model, the spray gun housing 1 is further provided with a connecting block 8, which has a pressing section 81 and a connecting section 82. The connecting block 8 allows the spray gun accessory to connect to external accessories of more shapes, increases the steam output methods, and meets the user's needs for different scenarios. Specifically, the spray gun housing 1 has a groove 18, and the connecting section 82 is movably disposed in the groove 18 and is used to connect external accessories; a third return spring 83 is provided between the pressing section 81 and the spray gun housing 1.

[0071] Working principle of connecting block 8: When it is necessary to connect external accessories, the user operates the pressing section 81, causing the connecting section 82 to move downward and retract into the groove 18. At this time, the connecting section 82 will make room to eliminate structural interference with the external accessories, so that the external accessories can be connected to the spray gun housing 1. When the external accessories are in place, the user releases the pressing section 81, and under the action of the third return spring 83, the connecting block 8 rises as a whole, so that the connecting section 82 extends upward to the outside of the groove 18. At the same time, the connecting section 82 can form structural interference with the external accessories, that is, it can prevent the external accessories from detaching from the spray gun housing 1, ensuring reliable connection and use between the two.

[0072] It is worth noting that the other technical solutions of this utility model are all existing technologies, and therefore will not be described in detail.

[0073] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the concept of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A handle-type spray gun accessory with a child lock function, comprising: The spray gun housing (1) has an internal mounting cavity (11), one end of the spray gun housing (1) is the steam inlet end (12), and the other end is the steam outlet end (13); The nozzle tube (2) is disposed in the mounting cavity (11), and the front end of the nozzle tube (2) extends out of the spray gun housing (1) through the steam outlet end (13); Steam inlet pipe (3), which is disposed at the steam inlet end (12); The conduit (4) is connected to and conducts through the steam inlet pipe (3); The on / off valve (5) is connected between the conduit (4) and the nozzle pipe (2). A trigger switch (6) is movably connected to the spray gun housing (1), and the trigger switch (6) forms an on / off valve (5); characterized in that It also includes a child lock switch (7), which is movably disposed in the mounting cavity (11) along the longitudinal direction; The child lock switch (7) includes a switch body (71), an unlocking section (72), a locking section (73), and a stopping section (74) protruding longitudinally on the switch body (71), and an operating section (75) protruding on the switch body (71); wherein, the operating section (75) extends at least partially outside the spray gun housing (1); the unlocking section (72) forms an active space (721) with the trigger switch (6); the locking section (73) forms a limiting locking engagement with the trigger switch (6); and the stopping section (74) can abut against the inner wall of the spray gun housing (1) and form a limiting engagement.

2. The handle-type spray gun attachment having a child lock function according to claim 1, characterized by: The spray gun housing (1) has a limiting rib (14), and the limiting rib (14) and the trigger switch (6) form a receiving area (141), and the child lock switch (7) is movably disposed in the receiving area (141).

3. The handle-type spray gun accessory with child lock function according to claim 1, characterized in that: The spray gun housing (1) has a stop plate (15), the stop plate (15) is provided with a stop rib (151), and the child lock switch (7) includes a stop section (76) protruding on the switch body (71), and the stop section (76) is provided with a plurality of stop grooves (761) along the longitudinal direction. The user controls the child lock switch (7) to move longitudinally through the operation section (75), so that the fixed position rib (151) can be inserted into any one of the position slots (761).

4. The handle-type spray gun accessory with child lock function according to claim 1, characterized in that: The spray gun housing (1) has a fixing block (16), and a first return spring (62) is provided between the fixing block (16) and the trigger switch (6); The trigger switch (6) has a first contact (63) at its front end that interacts with the on / off valve (5); The trigger switch (6) has a second contact (64) at its rear end that interacts with the child lock switch (7); The trigger switch (6) has a rotating shaft (61) on its side wall, and the trigger switch (6) is rotated with the spray gun housing (1) through the rotating shaft (61).

5. The handle-type spray gun accessory with child lock function according to claim 1, characterized in that: The spray gun housing (1) has a handheld through hole (17), which divides the mounting cavity (11) into an upper half (111) and a lower half (112). The trigger switch (6) and the child lock switch (7) are both located in the upper half (111), and the conduit (4) is located in the lower half (112).

6. The handle-type spray gun accessory with child lock function according to claim 1, characterized in that: The on / off valve (5) includes a valve body (51) and a valve core assembly (52); The valve body (51) has a small-diameter cavity (511), a large-diameter cavity (512), and an inlet cavity (513). The inlet cavity (513) is connected to the small-diameter cavity (511) through a manifold (514). The small-diameter cavity (511) is connected to the large-diameter cavity (512) through an opening and closing port (515). The conduit (4) is connected to and conducts through the inlet cavity (513). The nozzle pipe (2) is connected to and conducts through the large-diameter cavity (512). The valve core assembly (52) is disposed in the small-diameter cavity (511). The rear end of the valve core assembly (52) extends out of the valve body (51) and forms a transmission engagement with the trigger handle. The front end of the valve core assembly (52) extends into the large-diameter cavity (512). The valve core assembly (52) acts on the opening and closing port (515) to conduct or block the small-diameter cavity (511) and the large-diameter cavity (512).

7. The handle-type spray gun accessory with child lock function according to claim 6, characterized in that: The valve core assembly (52) includes a valve stem (521), a second return spring (522), a first sealing ring (523), and a sealing valve core (524); The valve stem (521) passes through the small-diameter cavity (511); The second return spring (522) abuts against the inner wall of the valve stem (521) and the valve body (51); The first sealing ring (523) is sleeved on the valve stem (521), and the valve stem (521) forms a sealing fit with the inner wall of the valve body (51) through the first sealing ring (523); The sealing valve core (524) is installed at the front end of the valve stem (521), the sealing valve core (524) is located in the large-diameter cavity (512), and the radial dimension of the sealing valve core (524) is greater than the radial dimension of the opening and closing port (515).

8. The handle-type spray gun accessory with child lock function according to claim 6, characterized in that: The nozzle tube (2) is fitted with several second sealing rings (21) at its rear end, and the nozzle tube (2) forms a sealing fit with the inner wall of the large-diameter cavity (512) through the second sealing rings (21).

9. The handle-type spray gun accessory with child lock function according to claim 1, characterized in that: The spray gun housing (1) is also provided with a connecting block (8), which has a pressing section (81) and a connecting section (82); The spray gun housing (1) has a groove (18) provided on it, and the connecting section (82) is movably disposed in the groove (18), and the connecting section (82) is used to connect external accessories. A third return spring (83) is provided between the pressing section (81) and the spray gun housing (1).

10. The handle-type spray gun accessory with child lock function according to claim 1, characterized in that: A rubber sleeve (31) is provided at the connection between the steam inlet pipe (3) and the conduit (4).

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