Spray gun with pressure gauge convenient to disassemble and assemble

Abstract

The spray gun comprises a gun body with a handheld portion and a wrench, a compressed air pipe is arranged in the gun body, the pressure gauge is arranged at the rear end of the compressed air pipe through a connecting structure, the connecting structure comprises a valve body and a valve seat, and the valve seat is arranged on the valve body and can rotate in the valve body around the axis of the valve seat under the action of external force. At least one steel ball hole is formed in the circumferential wall of the valve seat in the radial direction, steel balls are arranged in the steel ball holes, and release grooves matched with the steel balls are formed in the inner wall of the valve body. The pressure gauge is provided with a connector, and the peripheral wall of the connector is provided with a locking groove used for receiving the steel ball. Rapid and reliable connection and separation of the pressure gauge and the gun body are realized through simple rotation action; the clamping effect of the steel balls in the locking grooves ensures the stability and safety of the connecting structure, the structure is simple, operation is easy and convenient, and locking is firm; the pressure gauge is arranged in front of the visual field of an operator, so that the operator can know the air pressure index in the gun in the spraying operation process, and the use convenience of the spray gun is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of spraying, especially to a pressure gauge detachable spray gun. BACKGROUND

[0002] The spray gun is a device using liquid or compressed air as power. Common spray guns include cosmetic spray guns and paint spray guns (i.e. paint spray guns). The paint spray gun is a tool for spraying paint, which is used for surface treatment of products and is a kind of coating equipment. It atomizes paint into fine droplets by compressed air and sprays the paint onto the surface of the coated object. Compared with traditional manual brush painting, the paint spray gun is more time-efficient and more beautiful, with an efficiency 5-10 times higher than brush painting, and the coating film is fine, smooth and uniform.

[0003] The conventional spray gun displays air pressure by connecting an external pressure gauge when measuring pressure. It is time-consuming and laborious to install the pressure gauge, and the pressure gauge can only be installed at the air inlet of the spray gun, which is easy to damage the pressure gauge during use. Through the improvement of the above-mentioned spray gun, the existing electronic digital display gauge with pressure detection function is installed on the handle of the spray gun to form an integrated structure design, which does not need an external pressure gauge and is light in weight and easy to operate. However, when the pressure gauge is damaged, it is not easy to repair and replace, resulting in high maintenance cost of the spray gun in the later period. SUMMARY

[0004] In order to overcome the above-mentioned defects, the utility model provides a pressure gauge detachable spray gun, which realizes locking and loosening through rotation operation, realizes quick and reliable connection and separation of the pressure gauge, and the position of the pressure gauge allows the operator to know the air pressure index in the gun during spraying operation.

[0005] The utility model discloses a pressure gauge detachable spray gun, which comprises a gun body with a hand holding part and a wrench, a nozzle device is installed at the front end of the gun body, a compressed air pipe is arranged in the gun body, a pressure regulating device for controlling the supply of compressed air of the nozzle device is arranged in the compressed air pipe, the pressure regulating device is connected with the wrench, the pressure regulating device is driven by the wrench to control the air flow switch, and a pressure gauge for detecting and displaying the gas pressure in the compressed air pipe is arranged at the rear end of the gun body.

[0006] The connecting structure comprises a valve body and a valve seat, the valve body is fixedly installed on the compressed air pipe, the valve seat is arranged on the valve body and can rotate around its axis in the valve body under the action of external force; at least one steel ball hole is arranged on the peripheral wall of the valve seat along the radial direction thereof, a steel ball is arranged in the steel ball hole, and a release groove matched with the steel ball is arranged on the inner wall of the valve body; the pressure gauge has a connecting head which can be inserted into and drive the valve seat to rotate, and a locking groove for receiving the steel ball is arranged on the peripheral wall of the connecting head.

[0007] As a further improvement of the utility model, the valve seat is provided with a special-shaped interface near one end of the pressure gauge, the connecting head has a sealing part extending into the valve seat and a positioning part integrally connected with the sealing part and matched with the special-shaped interface; the locking groove is arranged between the sealing part and the positioning part.

[0008] A first sealing ring for realizing the sealed connection between the pressure gauge and the valve seat is arranged on the sealing part.

[0009] As a further improvement of the utility model, the peripheral wall of the valve seat is matched with the inner peripheral wall of the valve body in a clearance fit, and a second sealing ring for realizing the sealed connection between the valve seat and the valve body is arranged on the peripheral wall of the valve seat.

[0010] The steel ball hole is a cylindrical structure arranged along the radial direction of the valve seat, and the diameter of the side of the steel ball hole facing the central axis of the valve seat is smaller than the diameter of the steel ball, so that the steel ball is constrained in the steel ball hole, and when the valve seat drives the steel ball to rotate and separate from the release groove, at least part of the steel ball protrudes from the steel ball hole and is received by the locking groove, so as to realize the fixed connection between the pressure gauge and the gun body.

[0011] As a further improvement of the utility model, three steel ball holes are arranged on the valve seat, and the three steel ball holes are arranged in an annular array on the valve seat with the central axis of the valve seat as the center; a steel ball is arranged in each steel ball hole.

[0012] Correspondingly, three release grooves are arranged on the inner wall of the valve body corresponding to the three steel balls, and a locking part is formed between adjacent release grooves.

[0013] When the valve seat drives the steel ball to rotate, the steel ball separates from the release groove and enters the locking part, and moves inward along the radial direction of the valve seat under the action of the locking part so as to protrude at least partially from the steel ball hole.

[0014] As a further improvement of the utility model, the valve body is provided with a mounting hole along its radial direction, an arc-shaped groove is arranged around the outer peripheral wall of the valve seat corresponding to the mounting hole, a limiting screw is threadedly connected in the mounting hole, the end of the limiting screw extends into the arc-shaped groove to limit the rotation range of the valve seat, and when the three steel balls are located in the corresponding release grooves, the end of the limiting screw is stopped at one end of the arc-shaped groove; when the three steel balls are located in the corresponding locking portions, the end of the limiting screw is stopped at the other end of the arc-shaped groove.

[0015] As a further improvement of the utility model, the connecting head of the pressure gauge is provided with an air inlet channel along its axial direction; the valve seat is provided with an airflow pipe for connecting the compressed air pipe with the air inlet channel, and a valve core assembly arranged in the airflow pipe for opening or closing the airflow pipe gas outlet;

[0016] The valve core assembly comprises:

[0017] A fixed sleeve is configured to be fixedly connected to one end of the valve seat away from the airflow pipe gas outlet and positioned and connected with the valve body, and is provided with an airflow pipe air inlet port for abutting the compressed air pipe along the axial direction;

[0018] A valve core is configured to be elastically arranged in the airflow pipe and is insertedly matched with the airflow pipe gas outlet or the airflow pipe air inlet port.

[0019] As a further improvement of the utility model, the airflow pipe gas outlet and the airflow pipe air inlet port are both provided as a guide hole with a cylindrical structure and airflow holes arranged on both sides of the radial direction of the guide hole and communicated with the guide hole for gas passing through;

[0020] The valve core is an integral structure composed of a first end, a sealing end and a second end, the first end and the second end are both cylindrical structures matched with the guide hole, the sealing end is a tapered structure arranged outwardly and inclinedly along the radial direction from the first end to the second end, and a third sealing ring is arranged around the sealing end to close the airflow holes thereon when the first end is inserted into the guide hole of the airflow pipe gas outlet.

[0021] As a further improvement of the utility model, the valve core assembly further comprises a first reset spring, the first reset spring is sleeved on the second end, and the two ends of the first reset spring are elastically abutted on the sealing end and the fixed sleeve respectively.

[0022] As a further improvement of the utility model, the pressure regulating device comprises:

[0023] A power rod, the power rod is in a cylindrical structure, is slidably connected with the compressed air pipe, and one end of the power rod protrudes from the gun body and abuts against the wrench.

[0024] a conical seal provided on the other end of the power rod;

[0025] a second return spring provided in the compressed air pipe, and two ends of the second return spring are elastically abutted on the conical seal and the valve body, respectively;

[0026] The wrench is used for driving the power rod to drive the conical seal to reciprocate along the axis direction of the power rod, so as to control the supply amount of the compressed air pipe to the nozzle device.

[0027] The utility model discloses a beneficial effect is: through simple rotation action realizes the installation and dismounting of pressure gauge, makes the quick, reliable connection and separation of pressure gauge and gun body, has improved operating efficiency greatly, the clamping effect of steel ball in locking groove has guaranteed the stability and security of connecting structure, simple structure, easy operation, locking firm, in addition, through setting pressure gauge in the visual field of operator, can obtain the air pressure index in the gun of operator in the spraying operation process, thereby improves the convenience of the use of spray gun. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 It is the structural diagram of connecting structure of the utility model;

[0029] Figure 2 It is the structural diagram of spray gun of the utility model;

[0030] Figure 3 It is the exploded structural diagram of pressure gauge and connecting structure and the section view of connecting structure A-A, B-B, C-C direction of the utility model;

[0031] Figure 4 It is the structural diagram of fixed connection of pressure gauge and connecting structure and the section view of its A`-A`, B`-B`, C`-C` direction of the utility model.

[0032] The following description is made in conjunction with the drawings:

[0033] 1, gun body; 11, hand-held part; 12, handle; 13, compressed air pipe; 2, nozzle device; 3, pressure regulating device; 31, power lever; 32, conical sealing member; 33, second return spring; 4, connecting structure; 41, valve body; 411, release groove; 412, locking part; 413, mounting hole; 42, valve seat; 421, steel ball hole; 422, special-shaped interface; 423, arc-shaped groove; 424, air flow pipe; 4241, guide hole; 4242, air flow hole; 43, steel ball; 44, second sealing ring; 45, limiting screw; 46, valve core assembly; 461, fixing sleeve; 462, valve core; 4621, first end; 4622, sealing end; 4623, second end; 463, third sealing ring; 464, first return spring; 5, pressure gauge; 51, connecting head; 511, locking groove; 512, sealing part; 513, positioning part; 514, air inlet channel; 52, first sealing ring. DETAILED DESCRIPTION

[0034] The embodiments of the present application will be described in detail below with reference to the drawings.

[0035] Referring to Figures 1 to 4 The present application provides a pressure gauge detachable spray gun, which can be used for spraying various liquid raw materials, such as paint, oil or water, and can be adjusted according to the user's needs.

[0036] The spray gun comprises a gun body 1, which has a hand-held part 11 and a handle 12. The front end of the gun body 1 is provided with a nozzle device 2. The gun body 1 is provided with a compressed air pipe 13. The compressed air pipe 13 is provided with a pressure regulating device 3 for controlling the supply of compressed air to the nozzle device 2. The pressure regulating device 3 is connected to the handle 12, and the handle 12 drives the pressure regulating device 3 to control the air flow switch.

[0037] It should be noted that the gun body 1 is further provided with a through hole for accommodating a nozzle needle at the upper part of the compressed air pipe 13. The nozzle needle can move forward and backward along the axial direction. The front part of the gun body is provided with an inclined inlet for mounting a paint container. The front end of the gun body 1 is provided with the nozzle device 2 through threaded connection. The nozzle device 2 has a nozzle hole, which together with the tip of the nozzle needle forms an adjustable inlet for spraying. The upper end of the handle is connected to the nozzle needle. When the handle 12 is pulled backward, the nozzle needle is pushed backward to open the nozzle hole to spray paint. At the same time, the handle 12 is pulled backward to actuate the pressure regulating device 3 to control the supply of compressed air to the nozzle device 2. The end of the hand-held part 11 of the gun body is provided with an air pressure regulating knob and an air inlet interface. Therefore, the working principle of the spray gun of the present embodiment is the same as that of the prior art, and will not be described here.

[0038] Referring to Figure 2The difference from the prior art is that the spray gun provided by the embodiment is provided with a pressure gauge 5 at the rear end of the gun body 1 for detecting and displaying the gas pressure in the compressed air pipe 13; the pressure gauge 5 is fixedly connected with or separated from the gun body 1 through the connecting structure 4. The pressure gauge is arranged in front of the operator's visual field, so that the operator can know the gas pressure index in the gun during the spraying operation, thereby improving the convenience of using the spray gun.

[0039] Continuing to refer to Figures 1 to 4 The connecting structure 4 comprises a valve body 41 and a valve seat 42, the valve body 41 is fixedly installed on the compressed air pipe 13, the valve seat 42 is arranged on the valve body 41 and can rotate around its axis in the valve body 41 under the action of external force; at least one steel ball hole 421 is formed in the circumferential wall of the valve seat 42 along the radial direction, a steel ball 43 is arranged in the steel ball hole 421, and a release groove 411 matched with the steel ball 43 is arranged on the inner wall of the valve body 41; the pressure gauge 5 has a connecting head 51 which can be inserted into and drive the valve seat 42 to rotate, and a locking groove 511 for receiving the steel ball 43 is arranged on the outer circumferential wall of the connecting head 51. Preferably, the release groove is an arc structure matched with the steel ball, so that the steel ball will not be stuck when moving.

[0040] That is, the valve body is fixedly connected at the rear end of the compressed air pipe, the valve body is provided with a passage for arranging the valve seat, and the valve seat is gap-fitted with the valve body to realize that the valve seat is rotatable relative to the valve body. When the valve seat is rotated in the positive direction, the pressure gauge is fixedly connected with the gun body, at this time the steel ball is separated from the release groove, and is moved inward along the radial direction of the valve seat by the action of the inner circumferential wall of the valve body to protrude from the steel ball hole, so as to lock the pressure gauge on the valve seat after being received by the locking groove; correspondingly, when the valve seat is reversely rotated to make the steel ball pass through the release groove, the steel ball is received by the release groove along the radial direction due to the loss of the constraint of the inner circumferential wall of the valve body, at this time the pressure gauge is separated from the constraint of the steel ball to realize the separation from the valve seat.

[0041] Further, the valve seat 42 is provided with a special-shaped interface 422 close to the pressure gauge 5, the connecting head 51 has a sealing part 512 extending into the valve seat 42 and a positioning part 513 integrally connected with the sealing part 512 and matched with the special-shaped interface 422; the locking groove 511 is arranged between the sealing part 512 and the positioning part 513; a first sealing ring 52 for realizing the sealed connection between the pressure gauge 5 and the valve seat 42 is sleeved on the sealing part 512. The special-shaped interface 422 can be a rectangular interface, a square interface, or even a circular interface with a slot, etc., and its main function is to form a limit between the positioning part of the pressure gauge and the valve seat, so that the valve seat is synchronously rotated when the pressure gauge is rotated.

[0042] Further, the outer peripheral wall of the valve seat 42 is in clearance fit with the inner peripheral wall of the valve body 41, and the outer peripheral wall of the valve seat 42 is sleeved with a second sealing ring 44 for realizing the sealing connection of the valve seat 42 and the valve body 41; the steel ball hole 421 is a cylindrical structure arranged radially along the valve seat 42, and the diameter size of the side of the steel ball hole 421 towards the center axis of the valve seat 42 is smaller than the diameter size of the steel ball 43, so that the steel ball 43 is constrained in the steel ball hole 421, and when the valve seat 42 drives the steel ball 43 to rotate and disengage from the release groove 411, at least part of the steel ball 43 protruding from the steel ball hole 421 is received by the locking groove 511, so as to realize the fixed connection of the pressure gauge 5 and the gun body 1.

[0043] Specifically, the steel ball hole 421 is arranged in three, and the three steel ball holes 421 are arranged in an annular array on the valve seat 42 with the center axis of the valve seat 42 as the center axis, and each steel ball hole 421 is configured with a steel ball 43, that is, the three steel ball holes are distributed at an angle of 120°.

[0044] Correspondingly, the inner wall of the valve body 41 is annularly provided with three release grooves 411 corresponding to the three steel balls 43, and the locking portions 412 are formed between adjacent release grooves 411; when the valve seat 42 drives the steel ball 43 to rotate, the steel ball 43 disengages from the release groove 411 and enters the locking portion 412, and moves radially inward along the valve seat 42 under the action of the locking portion 412 to make at least part of the steel ball 43 protrude from the steel ball hole 421.

[0045] Further, the valve body 41 is provided with a mounting hole 413 along the radial direction thereof, and the outer peripheral wall of the valve seat 42 is annularly provided with an arc-shaped groove 423 corresponding to the mounting hole 413, and a limiting screw 45 is threadedly connected in the mounting hole 413, the end portion of the limiting screw 45 extends into the arc-shaped groove 423 to limit the rotation range of the valve seat 42, and when the three steel balls 43 are located in the corresponding release grooves 411, the end portion of the limiting screw 45 is stopped at one end of the arc-shaped groove 423; and when the three steel balls 43 are located in the corresponding locking portions 412, the end portion of the limiting screw 45 is stopped at the other end of the arc-shaped groove 423.

[0046] That is, by arranging the limiting screw, the movement of the valve seat with the steel balls between one release groove and the locking portion adjacent to the release groove is limited, which can prompt the operator to know whether the pressure gauge and the valve seat are in the locked state or in the unlocked state. In this embodiment, the central angle of the arc-shaped groove is between 10° and 120°.

[0047] Of course, the number and distribution of the steel balls can be adjusted according to actual needs to optimize the locking effect and unlocking convenience; and the proportion of the arc-shaped groove in the circumference of the valve seat is also adjusted accordingly.

[0048] Further, the connecting head 51 of the pressure gauge 5 is provided with an air inlet channel 514 along the axial direction thereof for conducting compressed air to the sensor of the pressure gauge to display the pressure in the compressed air pipe 13; the valve seat 42 is provided with an air flow pipe 424 for connecting the compressed air pipe 13 with the air inlet channel 514, and a valve core assembly 46 arranged in the air flow pipe 424 for opening or closing the air outlet of the air flow pipe, the valve core assembly 46 comprising a fixing sleeve 461, a valve core 462 and a first reset spring 464 sleeved on the valve core 462.

[0049] The fixing sleeve 461 is configured to be fixedly connected to the valve seat 42 at the end away from the air outlet of the air flow pipe and is positioned and connected with the valve body 41, and is provided with an air inlet of the air flow pipe along the axial direction and is in abutment with the compressed air pipe 13. The air outlet and the air inlet of the air flow pipe 424 are both provided as a guide hole 4241 of a cylindrical structure and air flow holes 4242 arranged on the two sides of the guide hole 4241 in the radial direction and communicating with the guide hole 4241 for the gas to pass through.

[0050] The valve core 462 is configured to be elastically arranged in the air flow pipe 424 and is in plug-in cooperation with the air outlet or the air inlet of the air flow pipe. Specifically, the valve core 462 is an integrated structure composed of a first end 4621, a sealing end 4622 and a second end 4623, the first end 4621 and the second end 4623 are both cylindrical structures matched with the guide hole 4241 to realize that the valve core does not rotate when the valve seat rotates around the axial line thereof; the sealing end 4622 is a tapered structure arranged obliquely outward in the radial direction from the first end 4621 toward the second end 4623, and a third sealing ring 463 is arranged around the sealing end 4622 to close the air flow holes 4242 thereon when the first end 4621 is inserted into the guide hole 4241 of the air outlet of the air flow pipe.

[0051] The first reset spring 464 is sleeved on the second end 4623, and the two ends of the first reset spring 464 are elastically abutted on the sealing end 4622 and the fixing sleeve 461, respectively.

[0052] Specifically, under the action of the first reset spring 464, when the pressure gauge 5 is connected to the valve seat 42, the second end 4623 of the valve core 462 moves toward the air inlet end of the air flow pipe, so that the sealing end 4622 thereof is away from the air outlet of the air flow pipe to open the air flow holes 4242 thereon to realize the flow of air; and under the spring force of the first reset spring 464, the first end 4621 of the valve core 462 can be elastically abutted on the end surface of the connecting head 51 of the pressure gauge 5 to offset the gap between the locking groove 511 and the steel ball 43, so as to ensure the stability of the connection of the pressure gauge 5; in addition, the compressed air enters the sensor in the pressure gauge 5 through the air inlet channel 514 of the pressure gauge 5 via the air flow holes 4242 to realize the display of the gas pressure in the compressed air pipe 13.

[0053] When the rotary pressure gauge 5 is disconnected from the valve seat 42, the valve core 462 is moved outward along its axial direction under the spring force of the first reset spring 464, and the sealing end 4622 of the valve core 462 completely seals and closes the gas flow hole 4242, preventing the leakage of gas in the compressed air pipe 13. At the same time, the pressure gauge 5 is pushed out of the valve seat 42 under the pushing force generated when the valve core 462 moves outward, so that the pressure gauge 5 is disconnected.

[0054] That is, by arranging the valve core assembly 46, the normal spraying operation of the spray gun can be ensured even if the pressure gauge is not installed on the spray gun.

[0055] Further, the pressure regulating device 3 comprises a power rod 31, a conical sealing member 32, and a second reset spring 33. The power rod 31 is in a cylindrical structure and is in sliding connection with the compressed air pipe 13. One end of the power rod 31 protrudes from the abutment between the gun body 1 and the wrench 12. The compressed air pipe 13 is provided with a sealing member at the end facing the wrench, which realizes the sliding sealing connection between the power rod 31 and the compressed air pipe. The conical sealing member 32 is arranged on the other end of the power rod 31. The second reset spring 33 is arranged in the compressed air pipe 13 and elastically abuts on the conical sealing member 32 and the valve body 41 at both ends.

[0056] The wrench 12 is used to drive the power rod 31 to move the conical sealing member 32 along the axial direction of the power rod 31 to control the supply amount of compressed air delivered by the compressed air pipe 13 to the nozzle device 2.

[0057] The process of installing and dismounting the pressure gauge in this embodiment is as follows:

[0058] Installation: The operator holds the pressure gauge 5, inserts the connecting head 51 of the pressure gauge 5 into the valve seat 42, and presses downward after aligning the upper positioning part 513 of the pressure gauge 5 with the special-shaped interface 422 of the valve seat 42 to overcome the force of the first reset spring 464. Then, the pressure gauge 5 is rotated forward until it cannot be rotated any more, and the installation of the pressure gauge is completed.

[0059] Explanation: The pressure gauge 5 drives the valve seat 42 to rotate synchronously, so that the steel ball 43 on the valve seat 42 is separated from the release groove 411 and enters the locking groove 511 along the radial direction inward. The arrangement of the arc-shaped groove 423 on the valve seat 42 makes the forward rotation action end at the end position of the arc-shaped groove 423, which indicates that the steel ball enters the locking groove.

[0060] Dismounting: The operator holds the pressure gauge 5 and reversely rotates the pressure gauge 5. At the same time, the valve core 462 is pushed out of the valve seat 42 under the spring force of the first reset spring 464, and the dismounting of the pressure gauge is realized.

[0061] In summary, the pressure gauge provided by the utility model is convenient to disassemble and assemble, the installation and disassembly of the pressure gauge are realized through simple rotating action, the pressure gauge and the gun body are quickly and reliably connected and separated, the operation efficiency is greatly improved, the clamping action of the steel ball in the locking groove ensures the stability and safety of the connecting structure, the structure is simple, the operation is simple, and the locking is firm, and in addition, the pressure gauge is arranged in the visual field of the operator, so that the operator can know the air pressure index in the gun during the spraying operation, and the convenience of the spraying gun is improved.

[0062] In the above description, many specific details are set forth in order to provide a thorough understanding of the present application. However, the above description is only a preferred embodiment of the present application, and the present application can be implemented in many other ways different from the description. Therefore, the present application is not limited by the above disclosed specific implementation. Meanwhile, any person skilled in the art can make many possible changes and modifications to the technical solution of the present application, or modify it into equivalent embodiments, without departing from the scope of the technical solution of the present application. Any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present application, without departing from the scope of the technical solution of the present application, still belongs to the protection scope of the technical solution of the present application.

Claims

1. A pressure gauge removable spray gun, comprising a gun body (1) with a hand holding part (11) and a spanner (12), a nozzle device (2) is installed at the front end of the gun body (1), a compressed air pipe (13) is arranged in the gun body (1), a pressure regulating device (3) for controlling the compressed air supply of the nozzle device (2) is arranged in the compressed air pipe (13), the pressure regulating device (3) is connected with the spanner (12), the pressure regulating device (3) is driven by the spanner (12) to realize the control of the air flow switch, characterized in that: The rear end of the gun body (1) is provided with a pressure gauge (5) for detecting and displaying the gas pressure in the compressed air pipe (13); the pressure gauge (5) is fixedly connected or releasably connected with the gun body (1) through a connecting structure (4); The connecting structure (4) comprises a valve body (41) and a valve seat (42), the valve body (41) is fixedly installed on the compressed air pipe (13), the valve seat (42) is arranged on the valve body (41) and can rotate around its axis in the valve body (41) under the action of external force; at least one steel ball hole (421) is formed in the circumferential wall of the valve seat (42) along the radial direction, a steel ball (43) is arranged in the steel ball hole (421), and a release groove (411) matched with the steel ball (43) is formed in the inner wall of the valve body (41); the pressure gauge (5) has a connecting head (51) which can be inserted into and drive the valve seat (42) to rotate, and a locking groove (511) for receiving the steel ball (43) is formed in the outer circumferential wall of the connecting head (51).

2. The pressure gauge field serviceable spray gun of claim 1, wherein: The valve seat (42) is provided with a special-shaped interface (422) at one end close to the pressure gauge (5), the connecting head (51) has a sealing part (512) extending into the valve seat (42) and a positioning part (513) integrally connected with the sealing part (512) and matched with the special-shaped interface (422); the locking groove (511) is arranged between the sealing part (512) and the positioning part (513); The sealing part (512) is sleeved with a first sealing ring (52) for realizing the sealed connection between the pressure gauge (5) and the valve seat (42).

3. The pressure gauge field serviceable lance of claim 2, wherein: The outer circumferential wall of the valve seat (42) is gap-fitted with the inner circumferential wall of the valve body (41), and the outer circumferential wall of the valve seat (42) is sleeved with a second sealing ring (44) for realizing the sealed connection between the valve seat (42) and the valve body (41); The steel ball hole (421) is a cylindrical structure arranged along the radial direction of the valve seat (42), and the diameter of the side of the steel ball hole (421) facing the central axis of the valve seat (42) is smaller than the diameter of the steel ball (43), so that the steel ball (43) is constrained in the steel ball hole (421), and when the valve seat (42) drives the steel ball (43) to rotate and separate from the release groove (411), at least part of the steel ball (43) protrudes from the steel ball hole (421) and is received by the locking groove (511), so as to realize the fixed connection between the pressure gauge (5) and the gun body (1).

4. The pressure gauge field serviceable lance of claim 3, wherein: The steel ball hole (421) is provided with three, and the three steel ball holes (421) are arranged in an annular array on the valve seat (42) with the central axis of the valve seat (42) as the central axis, and a steel ball (43) is arranged in each steel ball hole (421); Correspondingly, three release grooves (411) are arranged on the inner wall of the valve body (41) corresponding to the three steel balls (43), and a locking part (412) is formed between adjacent release grooves (411); When the valve seat (42) drives the steel ball (43) to rotate, the steel ball (43) is separated from the release groove (411) and enters the locking part (412), and is moved along the valve seat (42) radially inward under the action of the locking part (412) to at least partially protrude from the steel ball hole (421).

5. The pressure gauge field serviceable lance of claim 4, wherein: An installation hole (413) is arranged on the valve body (41) along the radial direction thereof, an arc-shaped groove (423) is arranged on the outer peripheral wall of the valve seat (42) and corresponds to the installation hole (413), a limiting screw (45) is threadedly connected in the installation hole (413), the end of the limiting screw (45) extends into the arc-shaped groove (423) to limit the rotation range of the valve seat (42), and when the three steel balls (43) are located in the corresponding release grooves (411), the end of the limiting screw (45) is stopped at one end of the arc-shaped groove (423); and when the three steel balls (43) are located in the corresponding locking parts (412), the end of the limiting screw (45) is stopped at the other end of the arc-shaped groove (423).

6. The pressure gauge field serviceable lance of claim 5, wherein: The connecting head (51) of the pressure gauge (5) is provided with an air inlet channel (514) along the axial direction thereof; the valve seat (42) is provided with an air flow pipe (424) for connecting the compressed air pipe (13) with the air inlet channel (514), and a valve core assembly (46) arranged in the air flow pipe (424) for opening or closing the air outlet of the air flow pipe; The valve core assembly (46) comprises: A fixed sleeve (461) configured to be fixedly connected to one end of the valve seat (42) away from the air outlet of the air flow pipe and positioned and connected with the valve body (41), which is provided with an air flow pipe air inlet port opposite to the compressed air pipe (13) along the axial direction; A valve core (462) configured to be elastically arranged in the air flow pipe (424) and inserted and matched with the air outlet of the air flow pipe or the air inlet port of the air flow pipe.

7. The pressure gauge field serviceable lance of claim 6, wherein: The air outlet of the air flow pipe and the air inlet port of the air flow pipe are both provided with a guide hole (4241) having a cylindrical structure and air flow holes (4242) arranged on both sides of the guide hole (4241) in the radial direction and communicating with the guide hole (4241) for gas to pass through; The valve core (462) is an integral structure composed of a first end (4621), a sealing end (4622) and a second end (4623), the first end (4621) and the second end (4623) are both cylindrical structures matched with the guide hole (4241), and the sealing end (4622) is a tapered structure arranged outwardly and inclinedly along the radial direction from the first end (4621) to the second end (4623), and a third sealing ring (463) is arranged around the sealing end (4622) to close the air flow holes (4242) thereon when the first end (4621) is inserted into the guide hole (4241) of the air outlet of the air flow pipe.

8. The pressure gauge field serviceable lance of claim 7, wherein: The valve core assembly (46) further comprises a first reset spring (464) sleeved on the second end (4623), and the two ends of the first reset spring (464) are elastically abutted on the sealing end (4622) and the fixed sleeve (461) respectively.

9. The pressure gauge field serviceable lance of claim 8, wherein, The pressure regulating device (3) comprises: A power rod (31) in a cylindrical structure, which is in sliding connection with the compressed air pipe (13), and one end of the power rod (31) protrudes out of the gun body (1) and abuts against the wrench (12); A conical seal (32) arranged on the other end of the power rod (31); A second reset spring (33) arranged in the compressed air pipe (13), and the two ends of the second reset spring (33) are elastically abutted on the conical seal (32) and the valve body (41) respectively; Wherein, the wrench (12) is used to drive the power rod (31) to drive the conical seal (32) to reciprocate along the axis direction of itself, so as to control the supply amount of compressed air delivered from the compressed air pipe (13) to the nozzle device (2).

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