A pneumatic rust remover

Abstract

This invention discloses a pneumatic rust remover, comprising a gun-shaped body with a trigger and an on / off valve assembly mounted on the handle, and a cylinder. The gun-shaped body has a cylindrical cavity formed in its barrel section. The cylinder is installed in a cylinder sleeve and, together with the cylinder sleeve, piston, valve seat front cover, and valve seat rear cover, forms an impact assembly. A vibration damping and buffering assembly is installed inside the cylindrical cavity of the gun-shaped body. The vibration damping and buffering assembly consists of a connecting sleeve, an impact isolator, and a cylinder buffer pad. The cylinder buffer pad is press-fitted between the bottom of the cylindrical cavity and the rear end face of the connecting sleeve. The impact isolator is press-fitted onto the front annular surface of the connecting sleeve via a locking nut, and the locking nut is screw-fitted to the cavity opening of the cylindrical cavity. The rear end of the cylinder sleeve passes through the locking nut and extends into the sleeve cavity of the connecting sleeve, where it is screw-connected. An air inlet valve assembly is provided inside the sleeve cavity. This invention offers a comfortable grip, high rust removal efficiency, good shock absorption, and is adaptable to rust removal tools with different functions.

Description

Technical Field

[0001] This invention relates to the technical field of rust removal tools, and in particular to a pneumatic rust remover. Background Technology

[0002] When rust forms on the surfaces of metal objects such as ships, bridges, and steel structures, rust removal is necessary. Commonly used rust removal methods include chemical rust removal, electrochemical rust removal, sandblasting, manual rust removal, and tumble burning. Manual rust removal typically involves using handheld rust removal tools to mechanically remove the rust layer from the metal surface. Traditional manual rust removal tools include electric and pneumatic types, with pneumatic tools being widely used due to their high safety, good rust removal effect, and low energy consumption. However, if poorly designed, pneumatic manual rust removal tools can cause significant vibration during rust removal, making the user uncomfortable. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a pneumatic rust remover that has high rust removal efficiency, good shock absorption effect and comfortable grip, in view of the current situation of the prior art.

[0004] The technical solution adopted by the present invention to solve the above-mentioned technical problems is as follows:

[0005] A pneumatic rust remover includes a gun-shaped body with a trigger and an on / off valve assembly mounted on the handle, and a cylinder. The gun-shaped body has a barrel section with an open front end. The cylinder is installed in a cylinder sleeve and together with the cylinder sleeve forms an impact assembly for intermittent impact rust removal. A vibration damping buffer assembly is installed in the barrel section of the gun-shaped body to prevent the rebound force borne by the impact assembly during rust removal from acting directly on the gun-shaped body. The vibration damping buffer assembly consists of a connecting sleeve, an impact isolator made of rubber, and a cylinder buffer pad. The cylinder buffer pad is press-fitted between the bottom of the barrel section and the rear end face of the connecting sleeve. The impact isolator is press-fitted onto the front annular surface of the connecting sleeve via a locking nut, which is screw-fitted to the opening of the barrel section. The rear end of the cylinder sleeve passes through the locking nut and extends into the sleeve cavity of the connecting sleeve, where it is screw-fixed. An intake valve assembly is provided in the sleeve cavity of the connecting sleeve for providing reversing air intake to the cylinder.

[0006] To optimize the above technical solution, the specific measures also include:

[0007] The aforementioned handle portion has a main air intake channel communicating with the barrel cavity of the gun body and a trigger mounting hole for mounting the trigger; the trigger is installed in the trigger mounting hole, and the trigger's push rod extends into the main air intake channel; the on / off valve assembly is installed in the main air intake channel, and the on / off valve assembly consists of a skeleton oil seal, an on / off valve stem, an on / off valve seat, and a return spring; the skeleton oil seal is positioned and installed on a sealing platform formed in the main air intake channel, the on / off valve seat is fixedly installed at the bottom end of the on / off valve stem, the upper end of the on / off valve stem passes through the skeleton oil seal and connects to the trigger's push rod, and the return spring presses against the bottom surface of the on / off valve seat, and the on / off valve seat, under the pressure of the return spring, seals and cooperates with the skeleton oil seal to form a throat for controlling the opening and closing of the main air intake channel.

[0008] An air intake connector is screwed into the opening of the main air intake channel. A speed control knob is fitted on the air intake connector for rotating to adjust the air intake volume. A connector sealing ring is provided between the speed control knob and the air intake connector to prevent air leakage. A connector gasket is press-fitted between the air intake connector and the main air intake channel to prevent air leakage. A speed control sealing ring is provided between the speed control knob and the main air intake channel to prevent air leakage.

[0009] The aforementioned air intake connector is equipped with a positioning device for elastically locking the speed control knob after the speed is adjusted to the desired position. The positioning device consists of a speed control positioning spring and a speed control positioning steel ball. The speed control positioning spring is pressed into the speed control positioning hole formed in the air intake connector via the speed control positioning steel ball. Under the elastic force of the speed control positioning spring, the speed control positioning steel ball rolls and engages with the speed control knob.

[0010] The connecting sleeve has a base positioning platform formed in the sleeve cavity near the bottom of the sleeve cavity, and the intake valve assembly is positioned and installed on the base positioning platform of the connecting sleeve; an intake cavity is formed between the intake valve assembly and the bottom of the sleeve cavity, and a gap channel connecting the main intake channel is formed between the outer peripheral surface of the connecting sleeve and the inner wall of the barrel cavity. Radial air holes are formed on the connecting sleeve to connect the intake cavity and the gap channel; a sealing ring for preventing air leakage in the gap channel and a cylindrical pin for preventing the cylinder outer sleeve from rotating are fitted on the connecting sleeve.

[0011] The aforementioned cylinder sleeve has a central through hole formed axially. The central through hole consists of a square insertion hole with a relatively small diameter at the front and a cylinder assembly cavity with a larger diameter at the rear for mounting the cylinder. The cylinder consists of a cylinder body fixedly fitted in the cylinder assembly cavity and a piston slidably mounted in the piston cavity of the cylinder body. The piston divides the piston cavity into a rod-side cavity at the front end and a rodless cavity at the rear end. The front end of the cylinder body cooperates with the boss in the cylinder assembly cavity to form an annular exhaust cavity. Two exhaust holes for connecting the exhaust cavity are axially machined on the front end face of the cylinder sleeve.

[0012] The outer circumferential surface of the cylinder block is machined with an intake section and an exhaust section, which are 90 degrees apart circumferentially. An intake channel for the rod chamber is formed between the intake section and the inner wall of the cylinder assembly cavity. The rod chamber intake channel is connected to the rod chamber of the cylinder block through a radial air hole formed on the intake section. An exhaust channel for connecting the exhaust chamber is formed between the exhaust section and the inner wall of the cylinder assembly cavity. Three radial exhaust holes for connecting the exhaust channel and the piston chamber are machined in a row on the exhaust section. The three radial exhaust holes are arranged from front to back as a front radial exhaust hole, a middle radial exhaust hole, and a rear radial exhaust hole.

[0013] The aforementioned intake valve assembly is composed of a front valve seat cover, a rear valve seat cover, a valve plate, and a valve seat pin. The front and rear valve seat covers fit together to form a valve plate chamber, in which the valve plate is movably disposed. The valve seat pin is positioned and inserted into pin holes formed in the front and rear valve seat covers. The front end of the front valve seat cover abuts against the rear end of the cylinder block. The front valve seat cover has a bent hole communicating with the valve plate chamber and an axial air hole for connecting the rodless chamber of the cylinder block with the valve plate chamber. The rear valve seat cover has a first intake through-hole, a second intake through-hole, and a central blind hole. The first intake through-hole... The bending holes of the valve seat front cover are connected, and the second air inlet and the central blind hole are both connected to the valve plate chamber. The valve seat rear cover is formed with a connecting air hole for connecting the central blind hole and the air inlet of the rod chamber. The valve plate in the valve plate chamber fits against the valve seat front cover to close the gap channel between the bending hole and the axial air hole, and opens the gap channel between the second air inlet and the central blind hole. The valve plate in the valve plate chamber fits against the valve seat rear cover to close the gap channel between the second air inlet and the central blind hole, and opens the gap channel between the bending hole and the axial air hole.

[0014] The aforementioned rust removal tool is detachably connected to the cylinder sleeve. A limit retaining ring and a shaft retaining ring for preventing axial movement of the limit retaining ring are fitted on the outer circumferential surface of the front end of the cylinder sleeve. The limit retaining ring is press-fitted with a ball bearing that extends into the square insertion hole of the cylinder sleeve. A limiting component for limiting the limit retaining ring is installed on the cylinder sleeve. The limiting component includes a compression spring press-fitted in the limiting hole formed in the cylinder sleeve and a limiting pin that elastically engages with the arc-shaped limiting groove of the limit retaining ring under the elastic force of the compression spring.

[0015] The aforementioned rust removal tools include a rust removal scraper and a rust removal needle assembly. During rust removal, the scraper's handle is inserted into a square insertion hole in the cylinder sleeve and impacts the piston rod of the cylinder piston. The rust removal needle assembly consists of a matching sleeve, an impact block, a rust removal needle seat, a return spring, a rust removal needle sleeve, and a rust removal needle. The rear end of the impact block is inserted into a square insertion hole in the cylinder sleeve during rust removal and impacts the piston rod of the cylinder piston. The rear end of the sleeve is fitted onto the cylinder sleeve, and a sleeve positioning pin is fitted onto the cylinder sleeve to prevent the sleeve from falling off. A protective rubber sleeve is fitted onto the handle of the gun-shaped body.

[0016] Compared with existing technologies, the present invention features a vibration damping and buffer assembly elastically press-fitted into the cylinder cavity of the gun body via a locking nut. An impact assembly, consisting of a cylinder sleeve and a cylinder, is then mounted on the vibration damping and buffer assembly. When the impact assembly strikes the rust removal tool, the vibration damping and buffer assembly absorbs vibration energy through appropriate elastic deformation, preventing the rebound force borne by the impact assembly from directly acting on the gun body. This creates a soft connection between the impact assembly and the gun body, achieving excellent shock absorption and ensuring user comfort. The rust removal tool and impact assembly are connected via a plug-in joint, facilitating easy installation and disassembly. Furthermore, it can be used with various different tools for rust removal, resulting in excellent rust removal performance and a wide range of applications. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the present invention when the rust removal needle assembly is installed;

[0018] Figure 2 This is an exploded view of the present invention;

[0019] Figure 3 This is a schematic diagram of the structure of the gun-shaped body of the present invention;

[0020] Figure 4 This is a schematic diagram of the assembly structure of the vibration damping and buffer component and the intake valve assembly of the present invention;

[0021] Figure 5 This is a schematic diagram of the structure of the on / off valve assembly of the present invention;

[0022] Figure 6 This is a cross-sectional view of the cylinder sleeve of the present invention;

[0023] Figure 7 This is a schematic diagram of the assembly structure of the cylinder sleeve and the cylinder of the present invention;

[0024] Figure 8 This is a three-dimensional structural diagram of the cylinder body of the present invention;

[0025] Figure 9 This is a schematic diagram of the intake valve assembly of the present invention;

[0026] Figure 10yes Figure 9 The right view;

[0027] Figure 11 yes Figure 10 Sectional view of the structure along line II-II (the state when the valve plate is attached to the valve seat back cover);

[0028] Figure 12 yes Figure 10 Sectional view of the structure along line II-II (the state when the valve plate is attached to the front cover of the valve seat);

[0029] Figure 13 yes Figure 1 Cross-sectional view along line I-I;

[0030] Figure 14 This is a schematic diagram of the rodless chamber intake piston of the present invention in the final position;

[0031] Figure 15 This is a schematic diagram of the structure of the rod chamber intake piston of the present invention in its initial position. Detailed Implementation

[0032] The embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

[0033] Figures 1 to 15 This is a schematic diagram of the structure of the present invention.

[0034] The attached figures are labeled as follows: rod chamber air inlet channel D, rod chamber radial air hole D1, ball G, rust remover J, air inlet cavity K, gap channel K1, lock nut L, sealing ring M, front radial exhaust hole P1, middle radial exhaust hole P2, rear radial exhaust hole P3, exhaust cavity Q, exhaust hole Q1, speed adjustment positioning spring S1, speed adjustment positioning steel ball S2, protective rubber sleeve T, cylindrical pin X, compression spring Y, limit pin Y1, gun body 1, handle part 11, main air inlet channel 11a, trigger mounting hole 11b, sealing platform 11c, gun barrel part 12, barrel cavity 12a, air inlet connector 13, connector sealing ring 131, connector gasket 132, speed adjustment knob 14, speed adjustment sealing ring 141. Trigger; 2. On / off valve assembly; 3. Skeleton oil seal; 31. On / off valve stem; 32. On / off valve seat; 33. Return spring; 34. Cylinder; 4. Cylinder body; 41. Rod chamber; 41a. Rodless chamber; 41b. Intake section; 411. Exhaust section; 412. Piston; 42. Cylinder sleeve; 5. Square insertion hole; 5a. Cylinder assembly cavity; 5b. Vibration damping and buffer assembly; 6. Connecting sleeve; 61. Radial air hole; 61a. Impact isolator; 62. Cylinder buffer pad; 63. Intake valve assembly; 7. Valve plate chamber; 7a. Valve seat front cover; 71. Bending hole; 71a. Axial air hole; 71b. Valve seat rear cover; 72. First intake through hole; 72a. Second intake through hole; 72b. Central blind hole; 72c. Connecting air hole; 72d. Valve plate 73, valve seat pin 74, limit retaining ring 8, arc-shaped limit groove 8a, shaft retaining ring 81, sleeve 91, impact block 92, rust removal needle seat 93, return spring 94, rust removal needle sleeve 95, rust removal needle 96, sleeve positioning pin 97.

[0035] like Figures 1 to 15 As shown, this invention discloses a pneumatic rust remover that offers a comfortable grip, excellent vibration damping, and compatibility with various rust removal tools. It comprises a gun-shaped body 1 and a pneumatic cylinder 4 for intermittent impact rust removal. The gun-shaped body 1 is integrally formed with a handle 11 for easy gripping and a barrel 12. Figure 3 It can be seen that the barrel portion 12 of the gun body 1 has a barrel cavity 12a with a front opening, and the handle portion 11 has a main air intake channel 11a connected to the barrel cavity 12a and a trigger mounting hole 11b connected to the main air intake channel 11a. An on / off valve assembly 3 for controlling the opening and closing of the main air intake channel 11a is installed in the main air intake channel 11a of the handle portion 11, and a trigger 2 is installed in the trigger mounting hole 11b to prevent air leakage and to open by pressing and pushing the on / off valve assembly 3. To improve the vibration damping effect of the cylinder 4 and to simplify the installation of the cylinder 4, such as... Figure 7 As shown, cylinder 4 is installed in cylinder sleeve 5 and together with cylinder sleeve 5, forms an impact assembly for vibratory rust removal using an impact rust removal tool. Figure 1As shown, a vibration damping and buffer assembly 6 is elastically press-fitted into the cylinder cavity 12a of the gun body 1 by a locking nut L. The vibration damping and buffer assembly 6 can absorb the vibration energy generated by the impact through appropriate elastic deformation, and prevent the rebound force borne by the impact assembly during rust removal from directly acting on the gun body 1, thus achieving a soft connection between the impact assembly and the gun body 1 through the vibration damping and buffer assembly 6. Figure 4 As shown, the vibration damping and buffer assembly 6 consists of a connecting sleeve 61 with a rigid connector, an impact isolator 62, and a cylinder buffer pad 63, both made of rubber. The cylinder buffer pad 63 is press-fitted between the bottom of the cylindrical cavity 12a and the rear end face of the connecting sleeve 61. The impact isolator 62 is press-fitted onto the front annular surface of the connecting sleeve 61 via a locking nut L, which is screw-fitted to the opening of the cylindrical cavity 12a. The rear end of the cylinder sleeve 5 passes through the locking nut L and extends into the cavity of the connecting sleeve 61, where it is screw-fixed to the connecting sleeve 61. The cavity of the connecting sleeve 61 of this invention is also provided with an intake valve assembly 7 for reversing the intake of the cylinder 4. The impact component of the present invention is elastically installed in the cylinder cavity 12a through the vibration damping buffer component 6, so that the impact component and the gun body 1 are softly connected, avoiding the rebound force borne by the impact component from acting directly on the gun body 1, thereby achieving excellent shock absorption effect and ensuring user comfort.

[0036] In the embodiments, as shown Figure 1 As shown, the trigger 2 has a push rod formed therein, and the push rod of the trigger 2 slides through the trigger mounting hole 11b and extends into the main air intake channel 11a in a hermetically sealed manner. Figure 5 As shown, the on / off valve assembly 3 consists of a skeleton oil seal 31, an on / off valve stem 32, an on / off valve seat 33, and a return spring 34. The skeleton oil seal 31 is positioned and installed on a sealing platform 11c formed within the main air intake channel 11a. The on / off valve seat 33 is fixedly installed at the bottom end of the on / off valve stem 32, and the upper end of the on / off valve stem 32 passes through the skeleton oil seal 31 and connects to the push rod of the trigger 2. The upper end of the return spring 34 presses against the bottom surface of the on / off valve seat 33. Under the pressure of the return spring 34, the on / off valve seat 33 seals and cooperates with the skeleton oil seal 31 to form a throat for controlling the opening and closing of the main air intake channel 11a. When the trigger 2 is pressed, the push rod of the trigger 2 can push the on / off valve stem 32, causing the on / off valve stem 32 to drive the on / off valve seat 33 to compress the return spring 34 and disengage from the skeleton oil seal 31, thus opening the throat of the main air intake channel 11a.

[0037] like Figure 1 and Figure 2As shown, an air intake connector 13 is spirally installed in the opening of the main air intake channel 11a of the present invention. The air intake connector 13 is used for convenient connection with the air supply hose. The lower end of the return spring 34 abuts against the upper end of the air intake connector 13. A speed control knob 14 is fitted on the air intake connector 13. The speed control knob 14 can control the opening angle of the air intake channel on the air intake connector 13 by rotating a certain angle, thereby controlling the air intake volume of the main air intake channel 11a, and thus achieving the purpose of controlling the magnitude of the impact force of the cylinder 4. The speed control knob 14 has three speed settings: high speed, medium speed, and low speed. When the speed control knob 14 is rotated to the high speed setting, the air supply volume is the largest, and the impact force of the cylinder 4 is also the largest. When the speed control knob 14 is rotated to the medium speed setting, the air supply volume is moderate, and the impact force of the cylinder 4 is also relatively moderate. When the speed control knob 14 is rotated to the low speed position, the air supply is at its minimum, and the impact force of the cylinder 4 is also at its minimum. To prevent air leakage at the connection, a joint sealing ring 131 is provided between the speed control knob 14 and the air inlet connector 13 to prevent air leakage, a joint gasket 132 is press-fitted between the air inlet connector 13 and the main air inlet channel 11a to prevent air leakage, and a speed control sealing ring 141 is provided between the speed control knob 14 and the main air inlet channel 11a to prevent air leakage.

[0038] Please refer to the examples for further details. Figure 1 and Figure 2 The air intake connector 13 is equipped with a positioning device for elastically locking the speed control knob 14 after speed adjustment. The positioning device consists of a speed control positioning spring S1 and a speed control positioning ball S2. The speed control positioning spring S1 is pressed into the speed control positioning hole formed in the air intake connector 13 via the speed control positioning ball S2. Under the elastic force of the speed control positioning spring S1, the speed control positioning ball S2 rolls and engages with the speed control knob 14. The speed control knob 14 has a groove machined for rolling engagement with the speed control positioning ball S2. Three positioning recesses are provided in the grooves for elastically engaging the speed control positioning ball S2. These three positioning recesses correspond to the high-speed, medium-speed, and low-speed positioning recesses, respectively.

[0039] In the embodiments, as shown Figure 4 As shown, a base positioning platform is formed in the cavity of the connecting sleeve 61 at a position relatively close to the bottom of the cavity, and the intake valve assembly 7 is positioned and installed on the base positioning platform of the connecting sleeve 61. An intake cavity K is formed between the intake valve assembly 7 and the bottom of the cavity. Figure 14As shown, a gap channel K1, communicating with the main air intake channel 11a, is formed between the outer peripheral surface of the connecting sleeve 61 and the inner wall of the barrel cavity 12a of the gun barrel 12. A radial air hole 61a is formed on the connecting sleeve 61 to connect the air intake cavity K and the gap channel K1. Thus, when the trigger 2 is pressed, the high-pressure gas entering the main air intake channel 11a can enter the air intake cavity K through the gap channel K1 and the radial air hole 61a. The connecting sleeve 61 is also fitted with a sealing ring M to prevent leakage from the gap channel K1 and a cylindrical pin X to prevent rotation of the cylinder sleeve 5. The cylindrical pin X prevents loosening between the cylinder sleeve 5 and the connecting sleeve 61 during vibration rust removal.

[0040] In the embodiments, as shown Figure 6 and Figure 7 As shown, the cylinder sleeve 5 of the present invention has a central through hole formed axially through it. The central through hole consists of a square insertion hole 5a with a relatively small diameter at the front and a cylinder assembly cavity 5b with a larger diameter at the rear for mounting the cylinder 4. The cylinder 4 consists of a cylinder body 41 fixedly fitted in the cylinder assembly cavity 5b and a piston 42. The cylinder body 41 is machined with a piston cavity, and the piston 42 is slidably disposed in the piston cavity of the cylinder body 41. A piston rod is provided on the front end face of the piston 42, and the piston 42 divides the piston cavity into a rod cavity 41a with a piston rod at the front end and a rodless cavity 41b without a piston rod at the rear end. Figure 7 As shown, the front end of the cylinder block 41 mates with the boss in the cylinder assembly cavity 5b to form an exhaust chamber Q with an annular space, as... Figure 13 As shown, the cylinder sleeve 5 has two exhaust holes Q1 machined axially from the front end to the rear end to connect to the exhaust chamber Q. The gas discharged from the rod chamber 41a and the rodless chamber 41b is discharged through the exhaust holes Q1 after entering the exhaust chamber Q.

[0041] In the embodiments, as shown Figure 8 As shown, the present invention has an intake section 411 and an exhaust section 412 machined on the outer circumferential surface of the cylinder block 41, the intake section 411 and the exhaust section 412 being 90 degrees apart circumferentially on the cylinder block 41. Figure 7 As shown, a spatial gap is formed between the intake section 411 and the inner wall of the cylinder assembly cavity 5b. This gap constitutes the rod chamber intake channel D. The intake section 411 is also radially machined with a rod chamber radial air hole D1 for connecting the rod chamber intake channel D and the rod chamber 41a. In this way, the high-pressure gas entering the rod chamber intake channel D can enter the rod chamber 41a through the rod chamber radial air hole D1, thereby pushing the piston 42 to move backward.

[0042] The exhaust section 412 of this invention mates with the inner wall of the cylinder assembly cavity 5b to form an exhaust channel for connecting the exhaust cavity Q (not shown in the figure, its structure is similar to the rod chamber intake channel D, except that the opening direction of the exhaust channel is forward). Three radial exhaust holes for connecting the exhaust channel and the piston cavity are machined in a straight line on the exhaust section 412. The three radial exhaust holes, from front to back, are the front radial exhaust hole P1, the middle radial exhaust hole P2, and the rear radial exhaust hole P3. When the piston 42 is in different positions, the front radial exhaust hole P1, the middle radial exhaust hole P2, and the rear radial exhaust hole P3 are used to discharge gas from the rod chamber 41a or the rodless chamber 41b into the exhaust channel. The discharged gas then enters the exhaust cavity Q through the exhaust channel and is discharged through the exhaust hole Q1.

[0043] In the embodiments, as shown Figure 9 As shown, the intake valve assembly 7 of the present invention is assembled from a front valve seat cover 71, a rear valve seat cover 72, a valve plate 73, and a valve seat pin 74. The front valve seat cover 71 and the rear valve seat cover 72 are fitted together to form a valve plate chamber 7a, and the valve plate 73 is movably disposed in the valve plate chamber 7a. The valve seat pin 74 is positioned and inserted into pin holes formed in the front valve seat cover 71 and the rear valve seat cover 72, preventing relative rotation between the front valve seat cover 71 and the rear valve seat cover 72. The front end of the front valve seat cover 71 is hermetically sealed against the rear port of the cylinder body 41. The front valve seat cover 71 has a bent hole 71a communicating with the valve plate chamber 7a and an axial air hole 71b for connecting the rodless chamber 41b of the cylinder body 41 with the valve plate chamber 7a. The rear valve seat cover 72 has a first intake through hole 72a, a second intake through hole 72b, and a central blind hole 72c. The first air inlet port 72a is connected to the bent hole 71a of the valve seat front cover 71. The second air inlet port 72b and the central blind hole 72c are both connected to the valve plate chamber 7a, and a connecting air hole 72d is formed on the valve seat rear cover 72. Figure 15 It can be seen that the connecting vent 72d is used to connect the central blind vent 72c with the rod cavity inlet vent D.

[0044] Figure 11 This is a schematic diagram showing the state of valve plate 73 when it is attached to valve seat rear cover 72. Figure 11 It can be seen that the valve plate 73 located in the valve plate chamber 7a, when in contact with the valve seat rear cover 72, can close the gap channel between the second air inlet port 72b and the central blind port 72c, and open the gap channel between the bent hole 71a and the axial air port 71b. When air needs to be introduced into the rodless chamber 41b to push the piston 42 forward to impact the rust removal tool, such as... Figure 11 and 14 As shown, the high-pressure gas entering the intake cavity K can sequentially pass through the first intake port 72a, the bend port 71a, the gap channel between the valve plate 73 and the valve seat front cover 71, and the axial air port 71b into the rodless chamber 41b of the cylinder 4, pushing the piston 42 forward. Figure 15Move from the initial position to Figure 14 When the piston 42 moves forward to its final position, the gas in the rod chamber 41a is discharged into the exhaust channel through the central radial exhaust port P2 and the front radial exhaust port P1, and then discharged through the exhaust chamber Q and the exhaust port Q1.

[0045] When the valve plate 73 located in the valve plate chamber 7a is in contact with the valve seat front cover 71, it can close the gap channel between the bent hole 71a and the axial air hole 71b, and open the gap channel between the second air inlet hole 72b and the central blind hole 72c. When the piston 42 moves forward to the final position, the high-pressure gas in the rodless chamber 41b is released through the rear radial exhaust hole P3 to the exhaust channel, exhaust chamber Q, and exhaust hole Q1. At this time, if Figure 12 As shown, the valve plate 73 in the valve plate chamber 7a moves forward and fits against the valve seat front cover 71, closing the gap channel between the bent hole 71a and the axial air hole 71b. The high-pressure gas entering the intake cavity K passes sequentially through the second intake through hole 72b, the gap channel between the second intake through hole 72b and the central blind hole 72c, the central blind hole 72c, and the connecting air hole 72d into the rod cavity intake channel D. After passing through the radial air hole D1 of the rod cavity, it enters the rod cavity 41a, pushing the piston 42 to move backward. Figure 14 The final position is moved to Figure 15 At the initial position, when piston 42 moves backward, the gas in the rodless chamber is discharged through the rear radial exhaust port P3 into the exhaust channel, and then discharged through the exhaust chamber Q and exhaust port Q1. This drives piston 42 to reciprocate, causing piston 42 to intermittently impact the rust removal tool for vibration rust removal.

[0046] from Figure 2 As can be seen, this invention can be adapted to rust removal tools with different functions, mainly including two types: rust removal scraper J and rust removal needle assembly. The rust removal tool is connected to the cylinder outer sleeve 5 using a detachable plug-in method. Figure 1 and Figure 13 As shown, a limiting retaining ring 8 and a shaft retaining ring 81 for preventing axial movement of the limiting retaining ring 8 are fitted on the outer peripheral surface of the front end of the cylinder sleeve 5. The limiting retaining ring 8 is press-fitted with a ball G that extends into the square insertion hole 5a of the cylinder sleeve 5. A limiting component for limiting the limiting retaining ring 8 is installed on the cylinder sleeve 5. The limiting component includes a compression spring Y pressed into the limiting hole formed in the cylinder sleeve 5 and a limiting pin Y1 that is elastically inserted into the arc-shaped limiting groove 8a of the limiting retaining ring 8 under the elastic force of the compression spring Y.

[0047] like Figure 1 and Figure 2As shown, the rust-removing scraper J of the present invention has a scraper bar, on which a limiting groove of a certain length is cut. The ball bearing G rolls and contacts the limiting groove, limiting the maximum stroke of the rust-removing scraper J. During rust removal, the scraper bar of the rust-removing scraper J is inserted into the square insertion hole 5a of the cylinder sleeve 5 and impacts with the piston rod of the piston 42 of the cylinder 4.

[0048] The rust-removing needle assembly of the present invention comprises a matching sleeve 91, an impact block 92, a rust-removing needle seat 93, a return spring 94, a rust-removing needle sleeve 95, and a rust-removing needle 96. During rust removal, the rear end of the impact block 92 is inserted into the square insertion hole 5a of the cylinder outer sleeve 5 to impact and engage with the piston rod of the piston 42 of the cylinder 4. Figure 13 As can be seen, the impact block 92 also has a limiting groove machined on it to cooperate with the rolling contact of the ball G. The rear end of the sleeve 91 of the present invention is fitted onto the cylinder outer sleeve 5, and the cylinder outer sleeve 5 is fitted with a sleeve positioning pin 97 to prevent the sleeve 91 from falling off. The handle part 11 of the gun-type body 1 is fitted with a protective rubber sleeve T. The protective rubber sleeve T can further increase the user's comfort when using the pneumatic rust remover.

[0049] The preferred embodiments of the present invention have been described, and various changes or modifications made by those skilled in the art will not depart from the scope of the present invention.

Claims

1. A pneumatic rust remover, comprising a gun-shaped body (1) with a trigger (2) and an on / off valve assembly (3) mounted on a handle portion (11) and a cylinder (4), wherein a cylindrical cavity (12a) with a front opening is formed in the barrel portion (12) of the gun-shaped body (1); a vibration damping buffer assembly (6) is installed in the cylindrical cavity of the gun-shaped body (1) to prevent the rebound force borne by the impact assembly during rust removal from acting directly on the gun-shaped body (1); the vibration damping buffer assembly (6) consists of a connecting sleeve (61) and a cylinder, both made of rubber. The device comprises an impact isolator (62) and a cylinder buffer pad (63); the cylinder buffer pad (63) is press-fitted between the bottom of the cavity (12a) and the rear end face of the connecting sleeve (61); the impact isolator (62) is press-fitted onto the front annular surface of the connecting sleeve (61) by a locking nut (L), the locking nut (L) being screwed into the cavity opening of the cavity (12a); the connecting sleeve (61) is provided with an intake valve assembly (7) for providing reversing for the intake of the cylinder (4); its characteristic is: The cylinder (4) is installed in the cylinder sleeve (5) and together with the cylinder sleeve (5) forms an impact assembly for intermittent impact rust removal tool vibration rust removal; the rear end of the cylinder sleeve (5) passes through the locking nut (L) and extends into the sleeve cavity of the connecting sleeve (61) and is screwed and fixedly connected to the connecting sleeve (61); The cylinder sleeve (5) is axially formed with a central through hole, which consists of a square insertion hole (5a) with a relatively small diameter at the front and a cylinder assembly cavity (5b) with a larger diameter at the rear for mounting the cylinder (4); the cylinder (4) consists of a cylinder body (41) fixedly fitted in the cylinder assembly cavity (5b) and a piston (42) slidably mounted in the piston cavity of the cylinder body (41), which divides the piston cavity into a rod cavity (41a) at the front end and a rodless cavity (41b) at the rear end; the front end of the cylinder body (41) cooperates with the boss in the cylinder assembly cavity (5b) to form an annular exhaust cavity (Q), and the cylinder sleeve (5) is axially machined with two exhaust holes (Q1) on the front end face for connecting the exhaust cavity (Q). The cylinder body (41) has an intake section (411) and an exhaust section (412) cut into its outer circumferential surface. The intake section (411) and the exhaust section (412) are 90 degrees apart circumferentially on the cylinder body (41). A rod chamber intake channel (D) is formed between the intake section (411) and the inner wall of the cylinder assembly cavity (5b). The rod chamber intake channel (D) is connected to the cylinder through a rod chamber radial air hole (D1) formed on the intake section (411). The rod chamber (41a) of the body (41) is connected; an exhaust channel for connecting the exhaust chamber (Q) is formed between the exhaust section (412) and the inner wall of the cylinder assembly chamber (5b), and three radial exhaust holes for connecting the exhaust channel and the piston chamber are machined in a line on the exhaust section (412), and the three radial exhaust holes are arranged from front to back as front radial exhaust hole (P1), middle radial exhaust hole (P2) and rear radial exhaust hole (P3).

2. The pneumatic rust remover according to claim 1, characterized in that: The handle portion (11) is formed with a main air intake channel (11a) communicating with the cylinder cavity (12a) of the gun body (1) and a trigger mounting hole (11b) for mounting the trigger (2); the trigger (2) is installed in the trigger mounting hole (11b), and the push rod of the trigger (2) extends into the main air intake channel (11a); the opening and closing valve assembly (3) is installed in the main air intake channel (11a), and the opening and closing valve assembly (3) consists of a skeleton oil seal (31), an opening and closing valve rod (32), an opening and closing valve seat (33), and a return spring (34); The skeleton oil seal (31) is positioned and installed on the sealing platform (11c) formed inside the main air intake channel (11a). The opening and closing valve seat (33) is fixedly installed at the bottom end of the opening and closing valve rod (32). The upper end of the opening and closing valve rod (32) passes through the skeleton oil seal (31) and is connected to the push rod of the trigger (2). The return spring (34) presses against the bottom surface of the opening and closing valve seat (33). Under the pressure of the return spring (34), the opening and closing valve seat (33) seals and cooperates with the skeleton oil seal (31) to form a throat for controlling the opening and closing of the main air intake channel (11a).

3. A pneumatic rust remover according to claim 2, characterized in that: An air intake connector (13) is spirally installed in the opening of the main air intake channel (11a). A speed control knob (14) for rotating and adjusting the air intake volume of the air intake connector (13) is fitted on the air intake connector (13). A connector sealing ring (131) for preventing air leakage is provided between the speed control knob (14) and the air intake connector (13). A connector gasket (132) for preventing air leakage is press-fitted between the air intake connector (13) and the main air intake channel (11a). A speed control sealing ring (141) for preventing air leakage is provided between the speed control knob (14) and the main air intake channel (11a).

4. A pneumatic rust remover according to claim 3, characterized in that: The air inlet connector (13) is equipped with a positioning device for elastically locking the speed control knob (14) after the speed is adjusted. The positioning device consists of a speed control positioning spring (S1) and a speed control positioning ball (S2). The speed control positioning spring (S1) is pressed into the speed control positioning hole formed by the speed control positioning ball (S2) through the speed control positioning ball (S2). The speed control positioning ball (S2) rolls and engages with the speed control knob (14) under the elastic force of the speed control positioning spring (S1).

5. A pneumatic rust remover according to claim 4, characterized in that: A base positioning platform is formed in the cavity of the connecting sleeve (61) at a position relatively close to the bottom of the cavity. The air intake valve assembly (7) is positioned and installed on the base positioning platform of the connecting sleeve (61). An air intake cavity (K) is formed between the air intake valve assembly (7) and the bottom of the cavity. A gap channel (K1) connecting the main air intake channel (11a) is formed between the outer peripheral surface of the connecting sleeve (61) and the inner wall of the cylinder cavity (12a) of the barrel part (12). A radial air hole (61a) for connecting the air intake cavity (K) and the gap channel (K1) is formed on the connecting sleeve (61). A sealing ring (M) for preventing air leakage in the gap channel (K1) and a cylindrical pin (X) for preventing the cylinder outer sleeve (5) from rotating are fitted on the connecting sleeve (61).

6. A pneumatic rust remover according to claim 5, characterized in that: The intake valve assembly (7) is assembled from a front valve seat cover (71), a rear valve seat cover (72), a valve plate (73), and a valve seat pin (74); the front valve seat cover (71) and the rear valve seat cover (72) are fitted together to form a valve plate chamber (7a), and the valve plate (73) is movably disposed in the valve plate chamber (7a); the valve seat pin (74) is positioned and inserted into the pin holes formed in the front valve seat cover (71) and the rear valve seat cover (72); The front end of the valve seat front cover (71) is abutted against the rear end of the cylinder body (41). The valve seat front cover (71) has a bent hole (71a) communicating with the valve plate chamber (7a) and an axial air hole (71b) for connecting the rodless chamber (41b) of the cylinder body (41) and the valve plate chamber (7a). The valve seat rear cover (72) has a first air inlet hole (72a), a second air inlet hole (72b), and a central blind hole (72c). The first air inlet hole (72a) is connected to the bent hole (71a) of the valve seat front cover (71). The second air inlet hole (72b) and the central blind hole (72c) are both connected to the valve plate chamber (7a). The valve seat rear cover (72) is formed with a connecting air hole (72d) for connecting the central blind hole (72c) and the rod chamber air inlet channel (D). The valve plate (73) located in the valve plate chamber (7a) is in contact with the valve seat front cover (71). The valve plate (73) located in the valve plate chamber (7a) and the valve seat cover (72) are in contact with each other, which can close the gap between the second air inlet hole (72b) and the central blind hole (72c) and open the gap between the second air inlet hole (72b) and the central blind hole (72c).

7. A pneumatic rust remover according to claim 6, characterized in that: The rust removal tool is detachably connected to the cylinder sleeve (5). A limit ring (8) and a shaft retaining ring (81) for preventing axial movement of the limit ring (8) are fitted on the outer peripheral surface of the front end of the cylinder sleeve (5). The limit ring (8) is press-fitted with a ball (G) that extends into the square insertion hole (5a) of the cylinder sleeve (5). A limiting component for limiting the limit ring (8) is installed on the cylinder sleeve (5). The limiting component includes a compression spring (Y) press-fitted in the limiting hole formed in the cylinder sleeve (5) and a limiting pin (Y1) that is elastically inserted into the arc-shaped limiting groove (8a) of the limit ring (8) under the elastic force of the compression spring (Y).

8. A pneumatic rust remover according to claim 7, characterized in that: The rust removal tool includes a rust removal scraper (J) and a rust removal needle assembly; the scraper bar of the rust removal scraper (J) is inserted into the square insertion hole (5a) of the cylinder sleeve (5) during rust removal operation, and impacts the piston rod of the piston (42) of the cylinder (4); the rust removal needle assembly consists of a matching sleeve (91), an impact block (92), a rust removal needle seat (93), a second return spring (94), a rust removal needle sleeve (95), and a rust removal needle (96). The impact block (92) is inserted into the square insertion hole (5a) of the cylinder sleeve (5) during the rust removal operation, and the piston rod of the piston (42) of the cylinder (4) impacts and cooperates with it; the rear end of the sleeve (91) is fitted on the cylinder sleeve (5), and the cylinder sleeve (5) is fitted with a sleeve positioning pin (97) to prevent the sleeve (91) from falling off; the handle part (11) of the gun body (1) is fitted with a protective rubber sleeve (T).

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