Mechanically driven high pressure lance

Abstract

The application provides a kind of mechanically driven high-pressure spray gun, including spray gun body, drive cylinder, connecting rod and piston plug movably arranged in the spray gun body;The end of the spray gun body is fixedly provided with a mounting seat, an active cavity is formed in the mounting seat, the piston plug has a plug extension part extending into the active cavity;The side wall of the mounting seat has a relief groove in communication with the active cavity, the middle part of the connecting rod is rotatably connected with the groove wall of the relief groove to form a lever fulcrum;One end of the connecting rod is movably connected with the plug extension part, and the other end of the connecting rod is rotatably connected with the movable end of the drive cylinder, and the piston plug is driven to move by the drive cylinder through the connecting rod.The advantages of the application are that the travel of the piston plug can be more accurately controlled, the glue flow deviation is effectively reduced, the atomization effect of the glue is better, and the glue application effect is improved and the glue application cost is reduced.

Description

[Technical Field]

[0001] This invention relates to the field of high-pressure spray gun technology, and particularly to a mechanically driven high-pressure spray gun. [Background Technology]

[0002] Artificial boards are made from wood or other non-wood plant materials, which are separated into various unit materials through certain mechanical processing, and then glued together with adhesives and other additives. In order to reduce the cost of gluing, existing technologies usually use high-pressure spray guns to atomize and spray the material with glue.

[0003] For example, Chinese utility model patent application number CN201720875857.7, filed on July 18, 2017, discloses a glue spray gun, which includes a spray gun body with a liquid channel and a nozzle channel. The spray gun body is provided with a gas channel, and a flow guiding device is built into the spray gun body. An atomizing chamber is provided near the nozzle channel. Both the liquid channel and the gas channel are connected to the atomizing chamber through the flow guiding device. This glue spray gun is provided with a liquid channel and a gas channel, and can supply liquid and gas simultaneously, so it can be used as a dual-fluid spray gun. For example, Chinese invention patent CN202211152744.6, filed on September 21, 2022, discloses a spray gun and a glue mixer. The spray gun includes a cylinder body, with an upper part forming a pressure chamber and a lower part forming a medium chamber; a sealing bushing, which is disposed between the pressure chamber and the medium chamber; a nozzle, which is connected to the cylinder body and has a medium flow channel formed inside the nozzle, which is connected to the medium chamber; the spray end of the nozzle forms an inclined surface, and a spray port connected to the medium flow channel is formed on the inclined surface; the center line of the spray port forms a preset angle with the axis of the nozzle; and a piston plug, one end of which has a piston body and the other end has a plug body that passes through the sealing bushing and extends into the medium flow channel. This spray gun uses a piston plug to push the medium for spraying, which can ensure more stable medium spraying, and the pushing pressure of the piston plug is greater than the pushing pressure of the gas.

[0004] However, existing technologies typically employ pneumatic methods (i.e., using gas) to drive the piston plug to atomize the adhesive. But pneumatic drive methods suffer from poor stability and cannot precisely control the piston plug's stroke, leading to significant deviations in the adhesive flow rate and affecting the application effect. In view of these problems, the inventors of this case conducted in-depth research, resulting in this invention. [Summary of the Invention]

[0005] The technical problem to be solved by the present invention is to provide a mechanically driven high-pressure spray gun, which solves the problem that the existing high-pressure spray gun uses a pneumatic method to drive the piston plug to move. However, the stability of the pneumatic drive method is relatively poor, and it is impossible to accurately control the stroke of the piston plug, resulting in a large deviation in the glue flow rate and affecting the glue application effect.

[0006] The present invention is implemented as follows: a mechanically driven high-pressure spray gun includes a spray gun body, a drive cylinder, a connecting rod, and a piston plug movably disposed within the spray gun body;

[0007] The spray gun body has a mounting base fixed at its end, and a movable cavity is formed inside the mounting base. The piston plug has a plug extension that extends into the movable cavity. The side wall of the mounting base has a clearance groove that communicates with the movable cavity. The middle part of the connecting rod is rotatably connected to the groove wall of the clearance groove to form a lever fulcrum. One end of the connecting rod is movably connected to the plug extension, and the other end of the connecting rod is rotatably connected to the movable end of the drive cylinder. The drive cylinder drives the connecting rod to move the piston plug.

[0008] Furthermore, it also includes a displacement sensor, which is fixed on the mounting base; the movable cavity extends through the mounting base, and the movable end of the displacement sensor is connected to the end cap extension.

[0009] Furthermore, the drive cylinder is a servo electric cylinder.

[0010] Furthermore, the drive cylinder is positioned above the mounting base via a connecting arm, and the extension / retraction direction of the drive cylinder is perpendicular to the axial direction of the piston plug.

[0011] Furthermore, the side wall of the plug extension is provided with a rectangular groove, and one end of the connecting rod has a cylinder rotatably disposed in the rectangular groove. The height of the rectangular groove along the axial direction of the piston plug is equal to the outer diameter of the cylinder.

[0012] Furthermore, the sidewall of the plug extension has an avoidance slope at a position corresponding to the rectangular groove.

[0013] Furthermore, a first cavity is formed in the upper part of the spray gun body, and a disc is formed below the piston plug extension. The disc is movably assembled in the first cavity. A first sealing groove is formed on the outer wall of the disc, and a first sealing ring is provided in the first sealing groove. The first sealing groove is tightly fitted with the first cavity.

[0014] Furthermore, a second cavity is formed below the first cavity in the spray gun body. The piston plug is fitted with a clamping ring, a first PTFE gasket, a second PTFE gasket, and a stainless steel ring from top to bottom at the position corresponding to the second cavity. A first step is formed at the bottom of the first cavity, and the upper end of the clamping ring is supported and fixed on the first step. The lower end of the clamping ring is chamfered, and the lower end of the clamping ring presses against the first PTFE gasket.

[0015] Furthermore, a third cavity is formed below the second cavity in the spray gun body, and a fourth cavity is formed below the third cavity. The outer wall of the spray gun body has an inlet that communicates with the fourth cavity. A second step is formed at the bottom of the second cavity, and a third step is formed at the bottom of the third cavity. A sealing sleeve is fitted onto the piston plug at the position corresponding to the third cavity. The upper part of the sealing sleeve is supported on the second step, and the upper end of the sealing sleeve is pressed against the stainless steel ring. The lower end of the sealing sleeve is supported on the third step. A second sealing groove is formed between the lower end of the sealing sleeve, the piston plug, and the third step, and a second sealing ring is provided in the second sealing groove.

[0016] Furthermore, the outer wall of the spray gun body has a discharge port that communicates with the first cavity section.

[0017] By adopting the technical solution of the present invention, at least the following beneficial effects are achieved:

[0018] 1. By setting up a high-pressure spray gun including a drive cylinder and a connecting rod, and rotatably connecting the middle part of the connecting rod to the clearance groove of the mounting base to form a lever fulcrum, one end of the connecting rod is movably connected to the extension of the piston plug, and the other end of the connecting rod is rotatably connected to the movable end of the drive cylinder; so that in actual operation, the drive cylinder can drive the connecting rod to move the piston plug, thereby pushing the adhesive in the spray gun body to be sprayed out in an atomized manner; compared with the existing technology that uses pneumatic means to drive the piston plug to move and achieve atomized adhesive spraying, the present invention uses a lever mechanical structure composed of a drive cylinder and a connecting rod to drive the piston plug to move, completely changing the traditional pneumatic drive method; since the stability of the lever mechanical structure is better than that of pneumatic drive, and the control precision of the drive cylinder is high, the stroke of the piston plug can be controlled more accurately, thereby effectively reducing the adhesive flow deviation, and the piston plug stroke is controlled more accurately, resulting in better atomization effect of the adhesive, thus improving the adhesive application effect and reducing the adhesive application cost.

[0019] 2. The middle part of the connecting rod is rotatably connected to the clearance groove of the mounting seat to form a lever fulcrum. By utilizing the principle of lever, the drive cylinder can easily drive the connecting rod to move the piston plug, which can well meet the atomization spraying requirements of glue with a pressure of 80-90KG.

[0020] 3. By installing a displacement sensor on the mounting base and connecting the movable end of the displacement sensor to the extension of the plug, the stroke of the piston plug can be measured in real time during operation. At the same time, the drive cylinder is set as a servo electric cylinder. Through the cooperation of the servo electric cylinder and the displacement sensor, the stroke of the piston plug can be accurately controlled, thereby further reducing the deviation of the glue flow rate.

[0021] 4. By creating a rectangular groove on the side wall of the piston plug extension and setting a cylinder at one end of the connecting rod, the height of the rectangular groove along the axis of the piston plug is equal to the outer diameter of the cylinder. This ensures that after the cylinder is assembled into the rectangular groove, it can always maintain contact with the groove wall without any gaps. In this way, when the connecting rod rotates around the lever fulcrum, the cylinder can accurately drive the piston plug to move, ensuring the stability and accuracy of the piston plug's movement.

[0022] 5. By setting a first sealing groove on the outer wall of the disc body and setting a first sealing ring in the first sealing groove, and the first sealing ring is a Glyd ring, the first sealing ring can fill the gap between the disc body and the cavity wall of the first cavity section, thereby achieving a sealing effect and ensuring that the adhesive cannot enter the upper part of the disc body.

[0023] 6. By forming a second cavity below the first cavity, and by sequentially fitting a compression ring, a first PTFE gasket, a second PTFE gasket, and a stainless steel ring on the piston plug at the position corresponding to the second cavity from top to bottom, the first and second PTFE gaskets can effectively fill the gap between the piston plug and the cavity wall of the second cavity after the compression ring and the stainless steel ring are clamped together, thus preventing the adhesive from entering the first cavity.

[0024] 7. By forming a second sealing groove between the lower end of the sealing bushing and the piston plug and the third step, and setting a second sealing ring in the second sealing groove, and the second sealing ring being a plug ring, the third cavity section and the fourth cavity section can be well sealed and isolated, so that the adhesive in the fourth cavity section cannot enter the third cavity section.

[0025] 8. A discharge port connected to the first chamber is provided on the outer wall of the spray gun body. On the one hand, it can eliminate the vacuum in the first chamber, ensuring that no vacuum phenomenon occurs in the first chamber, thereby avoiding increasing the downward pressure load on the piston plug. On the other hand, when the second sealing ring, the first PTFE gasket and the second PTFE gasket lose their sealing function, the adhesive can be discharged in time through the discharge port, ensuring that the adhesive cannot enter the top of the disc.

[0026] 9. A second sealing ring is installed in the second sealing groove between the lower end of the sealing bushing and the piston plug and the third step, thus forming the first layer of protection; a first PTFE gasket and a second PTFE gasket are installed in the second cavity section, thus forming the second and third layers of protection; a discharge port connected to the first cavity section is provided on the outer wall of the spray gun body, thus forming the fourth layer of protection; at the same time, a first sealing ring is provided in the first sealing groove of the disc body, thus forming the fifth layer of protection; through the above five protection functions, adhesive can be effectively prevented from entering the upper part of the disc body, thereby helping to extend the service life of the high-pressure spray gun. [Attached Image Description]

[0027] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0028] Figure 1 This is a perspective view of a mechanically driven high-pressure spray gun according to the present invention;

[0029] Figure 2 yes Figure 1 Top view;

[0030] Figure 3 yes Figure 1 The front view;

[0031] Figure 4 yes Figure 2 A cross-sectional view along the AA direction;

[0032] Figure 5 yes Figure 3 A cross-sectional view along the BB direction;

[0033] Figure 6 yes Figure 4 Enlarged view of section C;

[0034] Figure 7 yes Figure 5 Enlarged view of part D in the middle;

[0035] Figure 8 yes Figure 5 Enlarged view of part E in the middle.

[0036] Explanation of reference numerals in the attached figures:

[0037] High-pressure spray gun 100;

[0038] Spray gun body 1, first chamber 11, first step 111, second chamber 12, second step 121, third chamber 13, third step 131, fourth chamber 14, glue inlet 15, discharge outlet 16, nozzle 17.

[0039] Drive cylinder 2, connecting arm 21;

[0040] Link 3, cylinder 31;

[0041] Piston plug 4, plug extension 41, rectangular groove 411, clearance slope 412, disc 42, first sealing groove 421, sealing bushing 43, second sealing groove 44, sealing part 45.

[0042] Mounting base 5, movable cavity 51, clearance groove 52;

[0043] Displacement sensor 6;

[0044] First sealing ring 71, compression ring 72, chamfer 721, first PTFE gasket 73, second PTFE gasket 74, stainless steel ring 75, second sealing ring 76.

Detailed Implementation Methods

[0045] To better understand the technical solution of the present invention, the technical solution of the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0046] It should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used solely for the convenience of describing these embodiments and for 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. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature.

[0047] Please see Figures 1 to 8 As shown, the present invention provides a mechanically driven high-pressure spray gun 100, which includes a spray gun body 1, a drive cylinder 2, a connecting rod 3, and a piston plug 4 movably disposed within the spray gun body 1.

[0048] A mounting base 5 is fixedly provided at the end of the spray gun body 1. Specifically, the mounting base 5 is fixed to the upper end of the spray gun body 1 by bolts or screws, and the mounting base 5 can seal the upper end of the spray gun body 1. A movable cavity 51 is formed inside the mounting base 5, and the piston plug 4 has a plug extension 41 extending into the movable cavity 51. The plug extension 41 can move up and down within the movable cavity 51. The side wall of the mounting base 5 has a relief groove 52 communicating with the movable cavity 51. The relief groove 52 is used to avoid the connecting rod 3. The connecting rod 3 connects to the plug extension 41 and drives the entire piston plug 4 to move. The middle part of the connecting rod 3 is rotatably connected to the wall of the clearance groove 52 to form a lever fulcrum. One end of the connecting rod 3 is movably connected to the plug extension 41, and the other end of the connecting rod 3 is rotatably connected to the movable end of the drive cylinder 2. During operation, the drive cylinder 2 drives the connecting rod 3 to move the piston plug 4. When the piston plug 4 moves, it can push the adhesive in the spray gun body 1 to be sprayed out in an atomized manner, thereby improving the adhesive application effect and reducing the adhesive application cost.

[0049] This invention features a high-pressure spray gun 100 comprising a drive cylinder 2 and a connecting rod 3. The middle portion of the connecting rod 3 is rotatably connected to the clearance groove 52 of the mounting base 5 to form a lever fulcrum. One end of the connecting rod 3 is movably connected to the plug extension 41 of the piston plug 4, and the other end of the connecting rod 3 is rotatably connected to the movable end of the drive cylinder 2. During operation, the drive cylinder 2 drives the connecting rod 3 to move the piston plug 4, thereby atomizing the adhesive within the spray gun body 1 and spraying it out. Compared to existing technologies that use pneumatic methods to drive the piston plug for atomized adhesive spraying, this invention uses a lever mechanical structure composed of the drive cylinder 2 and the connecting rod 3 to drive the piston plug, completely changing the traditional pneumatic drive method. Because the lever mechanical structure has better stability than pneumatic drive, and the drive cylinder 2 has higher control precision, it can more accurately control the stroke of the piston plug 4, effectively reducing the adhesive flow deviation. Furthermore, the more accurate control of the piston plug 4's stroke results in better adhesive atomization, thus improving the application effect and reducing application costs. At the same time, the middle part of the connecting rod 3 is rotatably connected to the relief groove 52 of the mounting seat 5 to form a lever fulcrum. By utilizing the principle of lever, the drive cylinder 2 can easily drive the connecting rod 3 to drive the piston plug 4 to move, which can well meet the atomization spraying requirements of glue with a pressure of 80-90KG.

[0050] In a preferred embodiment of the present invention, the high-pressure spray gun 100 further includes a displacement sensor 6, which is fixed on the mounting base 5. Specifically, the displacement sensor 6 is positioned directly above the plug extension 41. The movable cavity 51 penetrates the mounting base 5, and the movable end of the displacement sensor 6 is connected to the plug extension 41. By setting the displacement sensor 6 on the mounting base 5 and connecting the movable end of the displacement sensor 6 to the plug extension 41, the present invention enables the displacement sensor 6 to measure the stroke of the piston plug 4 in real time during operation. This ensures that the drive cylinder 2 can more accurately control the stroke of the piston plug 4, thereby further reducing the deviation of the glue flow rate.

[0051] In one specific embodiment of the present invention, the drive cylinder 2 is a servo electric cylinder. Because servo electric cylinders offer high control precision, by setting the drive cylinder 2 as a servo electric cylinder and cooperating with the stroke measurement of the displacement sensor 6, more precise control of the stroke of the piston plug 4 can be achieved. Since pneumatic drive methods cannot achieve control precision of 0.5mm or 0.1mm, the traditional pneumatic drive method results in a large deviation in glue dispensing flow rate. However, the mechanical drive method of the present invention can achieve control precision of 0.5mm or 0.1mm, thus effectively reducing the glue dispensing flow rate deviation. Actual testing shows that by cooperating with the servo electric cylinder and the displacement sensor 6, the glue dispensing flow rate deviation can be controlled within 1%.

[0052] In a preferred embodiment of the present invention, the drive cylinder 2 is disposed above the mounting base 5 via a connecting arm 21. Specifically, the lower end of the connecting arm 21 is fixedly connected to the mounting base 5, the fixed end of the drive cylinder 2 is connected to the connecting arm 21, and the movable end of the drive cylinder 2 is connected to the connecting rod 3. The extension and retraction direction of the drive cylinder 2 is perpendicular to the axial direction of the piston plug 4.

[0053] In a preferred embodiment of the present invention, please refer to the following: Figure 6 As shown, in order for the connecting rod 3 to drive the piston plug 4 to move, a rectangular groove 411 is provided on the side wall of the plug extension 41. One end of the connecting rod 3 has a cylinder 31 rotatably disposed in the rectangular groove 411. The height of the rectangular groove 411 along the axial direction of the piston plug 4 is equal to the outer diameter of the cylinder 31.

[0054] This invention provides a rectangular groove 411 on the side wall of the piston plug extension 41, and a cylinder 31 at one end of the connecting rod 3. The height of the rectangular groove 411 along the axis of the piston plug 4 is equal to the outer diameter of the cylinder 31. This ensures that after the cylinder 31 is assembled into the rectangular groove 411, it remains in contact with the groove wall of the rectangular groove 411 without any gaps. As a result, when the connecting rod 3 rotates around the lever fulcrum, the cylinder 31 can precisely drive the piston plug 4 to move, thus ensuring the stability and accuracy of the piston plug 4's movement.

[0055] In a preferred embodiment of the present invention, the sidewall of the plug extension 41 is provided with a relief slope 412 at a position below the rectangular groove 411. The relief slope 412 can provide relief to the connecting rod 3, ensuring that the connecting rod 3 can rotate smoothly around the lever fulcrum.

[0056] In a preferred embodiment of the present invention, please refer to the following: Figure 4 and Figure 5 As shown, a first cavity 11 is formed in the upper part of the spray gun body 1. A disc 42 is formed below the piston plug 4's extension 41. The disc 42 is movably fitted into the first cavity 11, and can move up and down within the first cavity 11 during operation. A first sealing groove 421 is formed on the outer wall of the disc 42, and a first sealing ring 71 is disposed in the first sealing groove 421. The first sealing groove 421 is tightly fitted with the first cavity 11. In a specific embodiment of the present invention, the first sealing ring 71 is a Glyd ring. Because the disc 42 needs to move up and down within the first cavity 11 during operation, a gap needs to be left between the disc 42 and the cavity wall of the first cavity 11 to ensure smooth movement of the disc 42 and to prevent wear due to friction between the disc 42 and the cavity wall of the first cavity 11. At the same time, by setting a first sealing groove 421 on the outer wall of the disc 42 and setting a first sealing ring 71 (which is a Glyd ring) in the first sealing groove 421, the first sealing ring 71 can fill the gap between the disc 42 and the cavity wall of the first cavity 11, thereby achieving a sealing effect and preventing adhesive from entering the upper part of the disc 42.

[0057] In a preferred embodiment of the present invention, please refer to the following: Figure 4 , Figure 5 and Figure 7As shown, a second cavity 12 is formed below the first cavity 11 inside the spray gun body 1. The piston plug 4 is fitted with a clamping ring 72, a first PTFE gasket 73, a second PTFE gasket 74, and a stainless steel ring 75 from top to bottom at the position corresponding to the second cavity 12. The first PTFE gasket 73 and the second PTFE gasket 74 have good extensibility and can extend to fill the gap under pressure. The stainless steel ring 75 can provide a supporting plane for the second PTFE gasket 74 and can cooperate with the clamping ring 72 to press the first PTFE gasket 73 and the second PTFE gasket 74 together.

[0058] The bottom of the first cavity 11 forms a first step 111, and the upper end of the clamping ring 72 is supported and fixed on the first step 111. Specifically, the upper end of the clamping ring 72 can be locked and fixed on the first step 111 using screws or bolts. The lower end of the clamping ring 72 forms a chamfer 721, and the lower end of the clamping ring 72 presses against the first PTFE gasket 73. Because the first PTFE gasket 73 has good extensibility, when the clamping ring 72 presses down on the first PTFE gasket 73, the first PTFE gasket 73 can fill the gap at the chamfer 721 position, thereby achieving a better sealing effect. It should be noted that in the above preferred embodiment of the present invention, a first PTFE gasket 73 and a second PTFE gasket 74 are provided between the clamping ring 72 and the stainless steel ring 75. However, the present invention is not limited to this. In specific implementations, more PTFE gaskets can be provided between the clamping ring 72 and the stainless steel ring 75, or only one PTFE gasket can be provided between the clamping ring 72 and the stainless steel ring 75.

[0059] The present invention forms a second cavity 12 below the first cavity 11, and the piston plug 4 is fitted with a clamping ring 72, a first PTFE gasket 73, a second PTFE gasket 74 and a stainless steel ring 75 from top to bottom at the position corresponding to the second cavity 12; so that after the first PTFE gasket 73 and the second PTFE gasket 74 are clamped by the clamping ring 72 and the stainless steel ring 75, the first PTFE gasket 73 and the second PTFE gasket 74 can fill the gap between the piston plug 4 and the cavity wall of the second cavity 12 well, thereby preventing the adhesive from entering the first cavity 11.

[0060] In a preferred embodiment of the present invention, please refer to the following: Figure 4 , Figure 5 and Figure 8As shown, a third cavity 13 is formed below the second cavity 12 in the spray gun body 1, and a fourth cavity 14 is formed below the third cavity 13. The outer wall of the spray gun body 1 has an adhesive inlet 15 that communicates with the fourth cavity 14. During operation, the adhesive is delivered into the fourth cavity 14 through the adhesive inlet 15. A second step 121 is formed at the bottom of the second cavity 12, and a third step 131 is formed at the bottom of the third cavity 13. Both the second step 121 and the third step 131 serve as supports.

[0061] The piston plug 4 is fitted with a sealing sleeve 43 at the position corresponding to the third cavity section 13. The upper part of the sealing sleeve 43 is supported on the second step 121, and the upper end of the sealing sleeve 43 presses against the stainless steel ring 75, so that the stainless steel ring 75 can better cooperate with the clamping ring 72 to clamp the first PTFE gasket 73 and the second PTFE gasket 74. The lower end of the sealing sleeve 43 is supported on the third step 131. A second sealing groove 44 is formed between the lower end of the sealing sleeve 43, the piston plug 4, and the third step 131. A second sealing ring 76 is disposed in the second sealing groove 44. As a specific embodiment of the present invention, the second sealing ring 76 is a plug ring, and the sealing sleeve 43 is a brass sleeve.

[0062] The present invention forms a second sealing groove 44 between the lower end of the sealing bushing 43 and the piston plug 4 and the third step 131, and sets a second sealing ring 76 in the second sealing groove 44. The second sealing ring 76 is a plug ring, which can effectively seal and isolate the third cavity 13 and the fourth cavity 14, so that the adhesive in the fourth cavity 14 cannot enter the third cavity 13.

[0063] In a preferred embodiment of the present invention, the outer wall of the spray gun body 1 has a discharge port 16 communicating with the first cavity section 11. The discharge port 16 has the following two functions: first, it can eliminate the vacuum in the first cavity section 11, ensuring that no vacuum phenomenon occurs in the first cavity section 11, thereby avoiding increasing the downward pressure load on the piston plug 4; second, when the second sealing ring 76, the first PTFE gasket 73, and the second PTFE gasket 74 all lose their sealing function, the adhesive can be discharged in time through the discharge port 16, ensuring that the adhesive cannot enter the upper part of the disc.

[0064] This invention employs a first layer of protection by placing a second sealing ring 76 in the second sealing groove 44 between the lower end of the sealing bushing 43 and the piston plug 4 and the third step 131; a second layer of protection by placing a first PTFE gasket 73 and a second PTFE gasket 74 in the second cavity section 12; a fourth layer of protection by placing a discharge port 16 on the outer wall of the spray gun body 1 that communicates with the first cavity section 11; and a fifth layer of protection by placing a first sealing ring 71 in the first sealing groove 421 of the disc body 42. Through these five layers of protection, adhesive can be effectively prevented from entering the upper part of the disc body, thereby helping to extend the service life of the high-pressure spray gun 100.

[0065] In a preferred embodiment of the present invention, a nozzle 17 is provided at the bottom of the spray gun body 1, the interior of the nozzle 17 is connected to the fourth chamber 14, and a sealing part 45 that cooperates with the nozzle 17 is provided at the lower end of the piston plug 4.

[0066] In operation, the high-pressure spray gun 100 of this invention delivers adhesive into the fourth chamber 14 through the adhesive inlet 15. The movable end of the drive cylinder 2 retracts, causing the connecting rod 3 to rotate around the lever fulcrum. The cylinder 31 at the lower end of the connecting rod 3 drives the piston plug 4 to move downwards. As the piston plug 4 moves downwards, the sealing portion 45 at the lower end of the piston plug 4 pushes the adhesive forward, causing it to be atomized and sprayed through the nozzle 17. When the movable end of the drive cylinder 2 extends forward, it drives the connecting rod 3 to rotate around the lever fulcrum. The cylinder 31 at the lower end of the connecting rod 3 drives the piston plug 4 to move upwards, so that when the movable end of the drive cylinder 2 retracts again, the sealing portion 45 at the lower end of the piston plug 4 can continue to push the adhesive out. Simultaneously, throughout the entire operation, the displacement sensor 6 can measure the stroke of the piston plug 4 in real time, thereby achieving precise control of the stroke of the piston plug 4.

[0067] While specific embodiments of the present invention have been described above, those skilled in the art should understand that the specific embodiments described are merely illustrative and not intended to limit the scope of the present invention. Equivalent modifications and variations made by those skilled in the art in accordance with the spirit of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A mechanically driven high-pressure spray gun, comprising a spray gun body and a piston plug movably disposed within the spray gun body; characterized in that: It also includes the drive cylinder and connecting rod; The spray gun body has a mounting base fixed at its end, and a movable cavity is formed inside the mounting base. The piston plug has a plug extension that extends into the movable cavity. The side wall of the mounting base has a clearance groove that communicates with the movable cavity. The middle part of the connecting rod is rotatably connected to the groove wall of the clearance groove to form a lever fulcrum. One end of the connecting rod is movably connected to the plug extension, and the other end of the connecting rod is rotatably connected to the movable end of the drive cylinder. The drive cylinder drives the connecting rod to move the piston plug. The spray gun body also includes a displacement sensor, which is fixed on the mounting base. The movable cavity passes through the mounting base, and the movable end of the displacement sensor is connected to the plug extension. The drive cylinder is a servo electric cylinder. The drive cylinder drives the connecting rod to move the piston plug. When the piston plug moves, it pushes the adhesive inside the spray gun body to be sprayed out in an atomized manner. The upper part of the spray gun body forms a first cavity, and a disc is formed below the piston plug extension. The disc is movably assembled within the first cavity. A first sealing groove is formed on the outer wall of the disc, and a first sealing ring is provided in the first sealing groove. The first sealing groove fits tightly with the first cavity. A second cavity is formed below the first cavity in the spray gun body. A compression ring, a first PTFE gasket, a second PTFE gasket, and a stainless steel ring are sequentially fitted onto the piston plug at the position corresponding to the second cavity from top to bottom. A third cavity is formed below the second cavity in the spray gun body. A third step is formed at the bottom of the third cavity. A sealing sleeve is fitted onto the piston plug at the position corresponding to the third cavity. The lower end of the sealing sleeve is supported on the third step. A second sealing groove is formed between the lower end of the sealing sleeve, the piston plug, and the third step. A second sealing ring is provided in the second sealing groove. The outer wall of the spray gun body has a discharge port that communicates with the first cavity.

2. The mechanically driven high-pressure spray gun as described in claim 1, characterized in that: The drive cylinder is positioned above the mounting base via a connecting arm, and the extension / retraction direction of the drive cylinder is perpendicular to the axial direction of the piston plug.

3. The mechanically driven high-pressure spray gun as described in claim 1, characterized in that: The sidewall of the plug extension is provided with a rectangular groove, and one end of the connecting rod has a cylinder rotatably disposed in the rectangular groove. The height of the rectangular groove along the axial direction of the piston plug is equal to the outer diameter of the cylinder.

4. The mechanically driven high-pressure spray gun as described in claim 3, characterized in that: The sidewall of the plug extension has an avoidance slope at the position corresponding to the rectangular groove.

5. The mechanically driven high-pressure spray gun as described in claim 1, characterized in that: The bottom of the first cavity section forms a first step, and the upper end of the clamping ring is supported and fixed on the first step; the lower end of the clamping ring has a chamfer, and the lower end of the clamping ring presses against the first PTFE gasket.

6. The mechanically driven high-pressure spray gun as described in claim 5, characterized in that: A fourth cavity is formed below the third cavity, and the outer wall of the spray gun body has an inlet that communicates with the fourth cavity; a second step is formed at the bottom of the second cavity, the upper part of the sealing bushing is supported on the second step, and the upper end of the sealing bushing is pressed against the stainless steel ring.

Images