A spray gun structure for a high-pressure cleaning device

Abstract

This invention provides a spray gun structure for a high-pressure cleaning device, belonging to the technical field of high-pressure cleaners. It solves the problem of hand fatigue caused by prolonged trigger gripping after the gun valve is fully open. The spray gun structure of this high-pressure cleaning device includes a gun housing, a gun valve disposed within the gun housing, and a trigger mechanism connected to the gun housing and capable of controlling the opening of the gun valve. The gun valve includes a valve core, and the trigger mechanism includes a lever and a trigger. The front end of the lever is hinged to the gun housing and has a driving part at this end. The lower end of the trigger is hinged to the gun housing. When the trigger is turned backward, the upper end of the trigger gradually lifts the rear end of the lever upward through a roller, causing the driving part to drive the valve core downward. In this structure, the lever arm length at the rear end is much greater than the lever arm length at the front end, easily driving the lever to rotate and driving the valve core downward, making opening the spray gun easier and less strenuous.

Description

Technical Field

[0001] This invention belongs to the technical field of high-pressure cleaning machines, and in particular to a spray gun structure for a high-pressure cleaning device. Background Technology

[0002] A high-pressure washer is a machine that uses a power unit to drive a high-pressure plunger pump to generate high-pressure water to wash the surface of an object. It can peel off and wash away dirt, achieving the purpose of cleaning the surface of an object. The spray gun is one of the important components of a high-pressure washer. The spray gun is connected to the plunger pump on the high-pressure washer through a high-pressure water pipe. The high-pressure water in the plunger pump is sprayed out of the spray gun through the high-pressure water pipe. The spray gun is equipped with a trigger, which is used to control the water flow and shut-off of the spray gun, making it easier to operate during use.

[0003] Currently, a high-pressure spray gun for high-pressure cleaning equipment [Application No.: 201511031212.7] has been disclosed on the Chinese Patent Network. It includes a gun valve fixed by a gun housing. The gun valve comprises a valve body and a water outlet structure. The water outlet structure consists of an O-ring, a valve core, a steel ball, and a return spring, forming a sealing cavity for the gun valve. The O-ring is inserted into a small hole at the upper end of the valve core. Under the action of the spring, the steel ball adheres tightly to the sealing line within the valve body. When the trigger is pulled, the valve core is pressed down by a pad, opening the sealing line between the steel ball and the valve body. At this time, the high-pressure spray gun sprays high-pressure water. Simultaneously, under the action of the high-pressure water, the O-ring on the valve core adheres tightly to the upper wall of the valve body, providing a sealing effect. When the trigger is released, under the action of the conical spring, the trigger returns to its original state. Under the action of the high-pressure water and the spring force, the steel ball returns to its position adhering tightly to the sealing line within the valve body. At this time, the high-pressure spray gun returns to the state where no water is discharged.

[0004] The aforementioned high-pressure spray gun has the following drawbacks during use: When the trigger is opened, the user's hand is on the trigger, and the trigger is pulled by the fingers to rotate it, which in turn pushes the steel ball open through the valve core. The steel ball is pressed against the sealing line by the high-pressure water and the spring. The pressure of the high-pressure water is very high, especially at the moment of opening the gun, when the cleaning machine is in a pressure-holding state, the pressure of the high-pressure water is even greater, and thus the force acting on the steel ball is even greater. A lot of force needs to be applied to the trigger to make the steel ball overcome the spring and water pressure and be pushed open, which is very strenuous; due to the size of the hand... Due to the limited range of motion, the trigger travels relatively short when the finger pulls it. When the nozzle valve is fully open, although the resistance of the trigger decreases significantly, the valve core tends to move upward under the action of water pressure and spring. This causes the end of the trigger that contacts the valve core to be stressed, which in turn causes the trigger to tend to rotate outward and return to its original position. However, in order to ensure that the spray gun can spray water normally, the finger must remain in the trigger-pulled state for a long time. Because the trigger travels relatively short, the hand also needs to apply a large gripping force to the trigger. After holding it for a long time, the hand is very prone to fatigue. Summary of the Invention

[0005] The purpose of this invention is to address the aforementioned problems in existing technologies by proposing a spray gun structure for a high-pressure cleaning device. The technical problem to be solved by this invention is: how to solve the problem of needing to apply a very large force to the trigger to open the gun valve and the problem of hand fatigue from holding the trigger for a long time after the gun valve is fully opened.

[0006] The objective of this invention can be achieved through the following technical solutions:

[0007] A spray gun structure for a high-pressure cleaning device includes a gun housing, a gun valve disposed within the gun housing, and a trigger mechanism connected to the gun housing and capable of controlling the opening of the gun valve. The gun valve includes a valve core. The trigger mechanism includes a lever and a trigger. The front end of the lever is hinged to the gun housing and has a driving part at that end. The lower end of the trigger is hinged to the gun housing. When the trigger is turned backward, the upper end of the trigger gradually lifts the rear end of the lever upward through a roller, causing the driving part to drive the valve core to move downward.

[0008] Working process: The user holds the trigger and pulls it with their finger. The trigger rotates backward around the hinge point. The roller at the top of the trigger moves backward and gradually lifts the rear end of the lever upward. The lever rotates around the hinge point, causing the front end of the lever to rotate downward. The drive part at the front end of the lever presses down on the upper end of the valve core, thereby driving the valve core to move downward, opening the gun valve and enabling the gun to spray water.

[0009] In existing technologies, the lever and trigger are integrally molded structures, while in this structure, the lever and trigger are separate structures. The pivot point of the trigger is at the lower end, and the upper end rotates. When the hand is gripping the trigger, the index and middle fingers are closer to the upper end of the trigger, and the distance between the index and middle fingers and the pivot point of the trigger is greater. Therefore, when the index and middle fingers apply force to the trigger, due to their longer lever arms, it is easier to pull the trigger. Moreover, the index and middle fingers can apply greater force to the trigger compared to other fingers, further facilitating easy trigger pulling. In addition, the distance between the pivot point of the lever and the front end of the lever is much smaller than the distance between the pivot point of the lever and the rear end of the lever, making the lever arm length at the rear end of the lever much longer than that at the front end. This allows for easy rotation of the lever and downward movement of the valve core, making the opening of the spray gun easier and less strenuous.

[0010] In the spray gun structure of the aforementioned high-pressure cleaning equipment, the rear end of the lever bends downward to form a force-bearing part, and a concave guide surface is formed on the side of the force-bearing part facing the upper end of the trigger. The guide surface has a front force-bearing end facing the front end of the lever and a rear force-bearing end extending to the lower end face of the force-bearing part. The outer circumferential surface of the roller abuts against the guide surface. With this structure, in the initial state, the gun valve is in the closed state, and the upper end of the trigger abuts against the front force-bearing end of the guide surface. When the trigger is pulled, the trigger rotates backward around the hinge point, and the roller at the upper end of the trigger slides backward along the guide surface. During this process, the upper end of the trigger gradually lifts the rear end of the lever upward, thereby opening the gun valve.

[0011] In the spray gun structure of the aforementioned high-pressure cleaning equipment, the guide surface includes, sequentially arranged, a first inclined surface, a transition arc surface, a second inclined surface, and a third inclined surface from the front force-bearing end to the rear force-bearing end. When the gun valve is closed, the upper end of the trigger is in contact with the first inclined surface; during the process of the gun valve opening from closed, the upper end of the trigger is in contact with the second inclined surface via a roller; when the gun valve remains in the fully open state, the upper end of the trigger is in contact with the third inclined surface via a roller. With this structure, initially, the gun valve is in the closed state, and the upper end of the trigger rests against the first inclined surface.

[0012] At the initial moment of firing: During this stage, the gun valve is in the closed state, and the opening resistance is relatively large. The upper end of the trigger is against the first inclined plane and moves along the first inclined plane. The upper end of the trigger gradually moves from the first inclined plane to the curved surface. The slope of the first inclined plane is smaller than that of the second inclined plane, so the slope of the first inclined plane is smaller. The lever can be lifted with a smaller opening force, which can achieve the purpose of saving effort at the moment of firing.

[0013] From initial firing to full opening: During this stage, the upper end of the trigger gradually moves along the curved surface to the lower edge of the second slope. The gun valve gradually opens from slightly to fully. During this process, the water flow entering the valve body will offset some of the resistance, so that the resistance will be significantly reduced when the trigger is turned backward. The curved surface reduces the speed at which the gun valve fully opens, so that the lever is slowly lifted in the early stage of this stage. The slope of the second slope is larger, so that the lever is lifted quickly in the later stage of this stage. This makes the opening force of the gun valve gradually increase from small to large, which is conducive to opening the spray gun with less effort and provides better hand comfort.

[0014] Fully open valve stage: In this stage, the water passage is fully open, and the hand needs to hold the trigger for a long time to keep it in the corresponding position to complete the cleaning work. In this stage, the upper end of the trigger is pressed on the third inclined plane, which has the smallest inclination. The inclination of the third inclined plane is almost perpendicular to the direction of the force on the hand, so the hand will be subjected to very little force. It can be held with less force, avoiding hand fatigue from holding for a long time. In addition, in this stage, the effective lever arm is further extended to the maximum, making it easier to hold.

[0015] In the spray gun structure of the high-pressure cleaning equipment described above, when the gun valve is closed, the front edge of the third inclined plane is adjacent to the lower edge of the second inclined plane, and the front edge of the third inclined plane is raised upward relative to the rear edge of the third inclined plane.

[0016] In the spray gun structure of the aforementioned high-pressure cleaning equipment, when the spray gun mechanism can spray horizontally, the angles between the first, second, and third inclined planes and the horizontal plane are all less than 45°. The angle between the third inclined plane and the horizontal plane is smaller than the angle between the first inclined plane and the horizontal plane, and the angles between the first and third inclined planes and the horizontal plane are both smaller than the angle between the second inclined plane and the horizontal plane. According to the principles of mechanics, an angle of less than 45 degrees is generally considered labor-saving. The inclinations of the first, second, and third inclined planes are all much less than 45 degrees, thus achieving the purpose of labor saving.

[0017] In the spray gun structure of the aforementioned high-pressure cleaning equipment, a pin is fixed to the upper end of the trigger, and a roller is sleeved on the pin. The roller can rotate relative to the pin, and the outer circumferential surface of the roller is in contact with the guide surface. With this structure, as the trigger is pulled and rotates backward, the roller rolls along the guide surface. Rolling friction exists between the roller and the guide surface, further improving the effort required to start the spray gun and facilitating easy operation.

[0018] In the spray gun structure of the aforementioned high-pressure cleaning equipment, the gun valve includes a valve body. The valve body has a vertically arranged water inlet channel and a horizontally arranged water outlet channel. The upper end of the water inlet channel is connected to the rear end of the water outlet channel. From bottom to top, the water inlet channel contains a plug, a gun valve spring, a steel ball, and the valve core. A sealing ring is positioned above the steel ball within the water inlet channel, allowing the steel ball to fit snugly against the sealing ring for sealing. The upper end of the valve core extends out of the valve body. With this structure, the lower end of the valve core abuts against the steel ball, the upper end of the gun valve spring abuts against the steel ball, and the lower end abuts against the plug. When the steel ball is in contact with the sealing ring, the gun valve is in a closed state. When the valve core moves downwards and pushes open the steel ball, the gun valve is in an open state.

[0019] In the spray gun structure of the aforementioned high-pressure cleaning equipment, the trigger has a finger-operated position for pulling and a thumb-grip position for holding with the hand. The water outlet channel has a spray nozzle. When the gun valve is fully open, the finger-operated position, the thumb-grip position, and the spray nozzle are all within the same horizontal area. This structural design ensures that when the spray gun is fully open, the finger-operated position, the thumb-grip position, and the spray nozzle are all within the same horizontal area. This reduces the rotational torque caused by the jet reaction force, minimizing the tendency for the spray gun to wobble during spraying and providing better stability when held in the hand, thus reducing hand fatigue.

[0020] In the spray gun structure of the aforementioned high-pressure cleaning equipment, a buffer pad is provided on the drive unit, which abuts against the upper end of the valve core. The buffer pad prevents direct hard contact between the lever and the valve core, thereby preventing the end of the lever from breaking and protecting the lever.

[0021] In the spray gun structure of the aforementioned high-pressure cleaning equipment, a trigger spring is installed inside the gun housing. One end of the trigger spring abuts against the gun housing, and the other end abuts against the middle of the trigger. The trigger spring causes the trigger to always have a tendency to rotate forward. With this structure, during the process of pulling the trigger, the trigger rotates backward against the force of the trigger spring. When the spray gun is closed and the trigger is released, the trigger automatically rotates forward to reset under the force of the trigger spring.

[0022] Compared with the prior art, the spray gun mechanism of the high-pressure cleaning equipment of the present invention has the following advantages: The lever and trigger in this structure are separate structures, with the rotation fulcrum of the trigger at the lower end and the upper end of the trigger rotating. When the hand is held on the trigger, the index and middle fingers are closer to the upper end of the trigger, and the distance between the index and middle fingers and the rotation fulcrum of the trigger is relatively far. Therefore, when the index and middle fingers apply force to the trigger, due to their longer lever arms, it is easier to pull the trigger. Moreover, the index and middle fingers can apply greater force to the trigger compared to other fingers, which further facilitates easy trigger pulling. In addition, the distance between the rotation fulcrum of the lever and the front end of the lever is much smaller than the distance between the rotation fulcrum of the lever and the rear end of the lever, so that the lever arm length at the rear end of the lever is much larger than the lever arm length at the front end of the lever. This allows the lever to be easily driven to rotate and drive the valve core to move downward, making the opening of the spray gun easier and less strenuous. Attached Figure Description

[0023] Figure 1 This is a cross-sectional structural diagram of the present invention.

[0024] Figure 2 yes Figure 1 A magnified structural diagram of part A in the middle.

[0025] In the diagram, 1. Gun casing; 2. Gun valve; 20. Valve core; 21. Valve body; 22. Water inlet channel; 23. Water outlet channel; 23a. Spray nozzle; 24. Plug; 25. Gun valve spring; 26. Steel ball; 27. Sealing ring; 3. Lever; 30. Drive unit; 31. Force-bearing unit; 4. Trigger; 41. Finger-operated position; 42. Thumb grip position; 5. Guide surface; 50. Front force-bearing end; 51. Rear force-bearing end; 52. Inclined surface one; 53. Transition arc surface; 54. Inclined surface two; 55. Inclined surface three; 6. Pin; 7. Roller; 8. Buffer pad; 9. Trigger spring; 10. Hinge shaft one; 11. Hinge shaft two. Detailed Implementation

[0026] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0027] like Figure 1 and Figure 2 As shown, the spray gun structure of this high-pressure cleaning equipment includes a gun housing 1, a gun valve 2 disposed within the gun housing 1, and a trigger mechanism connected to the gun housing 1 and capable of controlling the opening of the gun valve 2. The gun valve 2 includes a valve core 20, and the trigger mechanism includes a lever 3 and a trigger 4. The front end of the lever 3 is hinged to the gun housing 1 via a hinge shaft 10, and this end has a driving part 30. The lower end of the trigger 4 is hinged to the gun housing 1 via a hinge shaft 11. In this embodiment, the rear end of the lever 3 bends downward to form a force-bearing part 31, and a concave guide surface 5 is formed on the side of the force-bearing part 31 facing the upper end of the trigger 4. The guide surface 5 has a front force-bearing end 50 facing the front end of the lever 3 and a rear force-bearing end 51 extending to the lower end face of the force-bearing part 31. 5 includes a first inclined plane 52, a transition arc surface 53, and a second inclined plane 54 arranged sequentially from the front force-bearing end 50 to the rear force-bearing end 51. The lower end surface of the force-bearing part 31 is a third inclined plane 55. The front edge of the third inclined plane 55 is adjacent to the lower edge of the second inclined plane 54. The front edge of the third inclined plane 55 is raised upward relative to the rear edge of the third inclined plane 55. The angle between the first inclined plane 52 and the horizontal plane is smaller than the angle between the second inclined plane 54 and the horizontal plane. The angle between the third inclined plane 55 and the horizontal plane is smaller than the angle between the first inclined plane 52 and the horizontal plane. Furthermore, the angles between the first inclined plane 52, the second inclined plane 54, and the third inclined plane 55 and the horizontal plane are all less than 45°. The upper end of the trigger 4 is fixed with a pin 6. A roller 7 is sleeved on the pin 6. The roller 7 can rotate relative to the pin 6.

[0028] At the initial moment of firing: During this stage, the gun valve 2 is in the closed state, and the opening resistance is relatively large. The outer circumference of the roller 7 at the upper end of the trigger 4 abuts against the inclined plane 52. The roller 7 rolls along the inclined plane 52 and gradually rolls from the inclined plane 52 to the transition arc surface 53. The slope of the inclined plane 52 is less than that of the inclined plane 54, making the slope of the inclined plane 52 smaller. The lever 3 can be lifted with a smaller opening force, which can achieve the purpose of saving effort at the moment of firing.

[0029] From initial firing to full opening: During this stage, the roller 7 at the top of the trigger 4 gradually rolls along the transition arc surface 53 to the lower edge of the second inclined plane 54. The gun valve 2 gradually opens from slightly to fully. During this process, the water flow entering the valve body 21 will offset some of the resistance, so that the resistance will be significantly reduced when the trigger 4 is turned backward. The setting of the transition arc surface 53 reduces the speed at which the gun valve 2 fully opens, so that the gun valve 2 slowly lifts the lever 3 in the early stage of this stage. The slope of the second inclined plane 54 is relatively large, so that the lever 3 is lifted quickly in the later stage of this stage. This makes the opening force of the gun valve 2 gradually increase from small to large, which is conducive to the effortless opening of the spray gun and provides better hand comfort.

[0030] Fully open valve stage: During this stage, the water passage is fully open. The hand needs to hold the trigger 4 for a long time to keep the trigger 4 in the corresponding position to complete the cleaning work. During this stage, the roller 7 at the top of the trigger 4 rolls onto the inclined plane 3 55. The inclination of the inclined plane 3 55 is minimal. The inclination of the inclined plane 3 55 is almost perpendicular to the direction of the force on the hand, so the hand will be subjected to very little force. It can be held with less force, avoiding hand fatigue from holding for a long time. In addition, during this stage, the effective arm of the lever 3 is further extended to the maximum, making it easier to hold.

[0031] like Figure 1 As shown, the trigger 4 has a finger-operated position 41 for pulling the trigger and a thumb-grip position 42 for holding the trigger with the thumb and forefinger. The water outlet channel 23 has a spray nozzle 23a. When the gun valve 2 is fully open, the finger-operated position 41, the thumb-grip position 42, and the spray nozzle 23a are in the same horizontal area. When the spray gun is fully open, the finger-operated position 41, the thumb-grip position 42, and the spray nozzle 23a are in the same horizontal area. This reduces the rotational torque caused by the jet reaction force, thus reducing the tendency of the spray gun to shake during water spraying. This provides better stability when holding the spray gun and reduces hand fatigue.

[0032] like Figure 1 As shown, a buffer pad 8 is provided on the drive unit 30. The buffer pad 8 can abut against the upper end of the valve core 20. The buffer pad 8 prevents the lever 3 from making direct hard contact with the valve core 20, thereby preventing the end of the lever 3 from breaking and protecting the lever 3. A trigger spring 9 is provided inside the gun housing 1. One end of the trigger spring 9 abuts against the gun housing 1, and the other end abuts against the middle of the trigger 4. The trigger spring 9 makes the trigger 4 tend to rotate forward. During the process of pulling the trigger 4, the trigger 4 rotates backward against the force of the trigger spring 9. When the spray gun is closed, the trigger 4 is released, and the trigger 4 automatically rotates forward to reset under the force of the trigger spring 9.

[0033] like Figure 1As shown, the gun valve 2 includes a valve body 21. The valve body 21 has a vertically arranged inlet channel 22 and a horizontally arranged outlet channel 23. The upper end of the inlet channel 22 is connected to the rear end of the outlet channel 23. From bottom to top, the inlet channel 22 contains a plug 24, a gun valve spring 25, a steel ball 26, and a valve core 20. A sealing ring 27 is positioned above the steel ball 26 within the inlet channel 22, allowing the steel ball 26 to fit and seal against the sealing ring 27. The upper end of the valve core 20 extends beyond the valve body 21. The lower end of the valve core 20 abuts against the steel ball 26. The upper end of the gun valve spring 25 abuts against the steel ball 26, and the lower end abuts against the plug 27. When the steel ball 26 is in contact with the sealing ring 27, the gun valve 2 is in a closed state. When the valve core 20 moves downwards and pushes open the steel ball 26, the gun valve 2 is in an open state.

[0034] The specific embodiments described herein are merely illustrative of the spirit of the invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of the invention or exceeding the scope defined by the appended claims.

Claims

1. A lance structure of a high-pressure cleaning apparatus, comprising a lance housing (1), a lance valve (2) provided in the lance housing (1), and a trigger mechanism connected to the lance housing (1) and capable of controlling opening of the lance valve (2), the lance valve (2) comprising a valve core (20), characterized in that, The trigger mechanism comprises a lever (3) and a trigger (4), the front end of the lever (3) is hinged to the gun shell (1), the front end of the lever (3) has a driving part (30), the lower end of the trigger (4) is hinged to the gun shell (1), when the trigger (4) rotates backward, the upper end of the trigger (4) gradually lifts the rear end of the lever (3) upward through a roller (7) to make the driving part (30) drive the valve core (20) to move downward; the rear end of the lever (3) is bent downward to form a stress part (31), and the stress part (31) is formed with an inner concave guide surface (5) on the side of the upper end of the trigger (4), the guide surface (5) has a front stress end (50) facing the front end of the lever (3) and a rear stress end (51) extending to the lower end surface of the stress part (31), and the outer circumferential surface of the roller (7) is in abutment with the guide surface (5); the guide surface (5) comprises a first inclined surface (52), a transition arc surface (53), a second inclined surface (54) and a third inclined surface (55) arranged in sequence from the front stress end (50) to the rear stress end (51), the included angle between the first inclined surface (52) and the horizontal plane is smaller than the included angle between the second inclined surface (54) and the horizontal plane, when the gun valve (2) is closed, the upper end of the trigger (4) is in abutment with the first inclined surface (52); when the gun valve is from closed to open, the upper end of the trigger (4) is in abutment with the second inclined surface (54) through the roller (7); when the gun valve is kept in the fully open state, the upper end of the trigger (4) is in abutment with the third inclined surface (55) through the roller (7); when the gun valve (2) is closed, the front edge of the third inclined surface (55) is in abutment with the lower edge of the second inclined surface (54), and the front edge of the third inclined surface (55) is upwardly tilted relative to the rear edge of the third inclined surface (55); when the spray gun mechanism can be horizontally sprayed, the included angles between the first inclined surface (52), the second inclined surface (54) and the third inclined surface (55) and the horizontal plane are all smaller than 45°, the included angle between the third inclined surface (55) and the horizontal plane is smaller than the included angle between the first inclined surface (52) and the horizontal plane, and the included angles between the first inclined surface (52) and the horizontal plane and the third inclined surface (55) and the horizontal plane are both smaller than the included angle between the second inclined surface (54) and the horizontal plane.

2. A lance structure for a high-pressure cleaning apparatus according to claim 1, characterized in that The upper end of the trigger (4) is fixed with a pin shaft (6), the pin shaft (6) is sleeved with a roller (7), the roller (7) can rotate relative to the pin shaft (6), and the outer circumferential surface of the roller (7) is in abutment with the guide surface (5).

3. The lance structure of a high-pressure cleaning apparatus according to claim 1, wherein The gun valve (2) comprises a valve body (21) with a water inlet channel (22) arranged vertically and a water outlet channel (23) arranged horizontally in the valve body (21), the upper end of the water inlet channel (22) is communicated with the rear end of the water outlet channel (23), the water inlet channel (22) is sequentially provided with a plug (24), a gun valve spring (25), a steel ball (26) and the valve core (20) from bottom to top, a sealing ring (27) is arranged above the steel ball (26) in the water inlet channel (22), the steel ball (26) can be sealed by abutting against the sealing ring (27), and the upper end of the valve core (20) can extend out of the valve body (21).

4. A lance structure for a high-pressure cleaning apparatus according to claim 3, wherein The trigger (4) has a finger pulling position (41) for fingers to pull and a web holding position (42) for the web of a hand to hold, the water outlet channel (23) has a water outlet (23a), and when the gun valve (2) is fully opened, the finger pulling position (41), the web holding position (42) and the water outlet (23a) are in the same horizontal area.

5. A lance structure for a high-pressure cleaning apparatus according to claim 1 or 3, wherein The driving part (30) is provided with a gasket (8), and the gasket (8) can abut against the upper end of the valve core (20).

6. The lance structure of a high-pressure cleaning apparatus according to claim 1, wherein The gun shell (1) is provided with a trigger spring (9), one end of the trigger spring (9) abuts against the gun shell (1), the other end abuts against the middle part of the trigger (4), and the trigger spring (9) makes the trigger (4) have a tendency to always rotate forward.

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