CN219005617U

CN219005617U - Pneumatic sander

Info

Publication number: CN219005617U
Application number: CN202320120802.0U
Authority: CN
Inventors: 庄世良
Original assignee: Ningbo Xinxing Pneumatic Goods Co ltd
Current assignee: Ningbo Xinxing Pneumatic Goods Co ltd
Priority date: 2023-02-06
Filing date: 2023-02-06
Publication date: 2023-05-12
Anticipated expiration: 2033-02-06

Abstract

The utility model discloses a pneumatic sander, which comprises a sander body, an eccentric wheel assembly and a cylinder assembly, wherein the eccentric wheel assembly and the cylinder assembly are arranged on the sander body, and the sander body is provided with a handle part and an assembly part; a main air inlet duct for supplying high-pressure air to the air cylinder and a main air outlet duct for discharging air discharged by the air cylinder are formed in the handle part, and an opening and closing valve assembly for closing the main air inlet duct is arranged in the handle part; a trigger for pushing the opening and closing valve assembly to open the main air inlet duct is hinged below the assembly part; an air inlet joint with a speed regulation function is arranged at the orifice of the main air inlet duct; the orifice of the main exhaust duct is connected with a muffler for eliminating noise. The polishing device is simple in structure, low in noise, good in polishing effect and comfortable to hold.

Description

Pneumatic sander

Technical Field

The utility model relates to the technical field of sanding machines, in particular to a pneumatic sanding machine.

Background

The pneumatic sander is generally used for metal grinding, cutting, paint layer removal, putty layer polishing and the like. The polishing agent is suitable for the operations of fine polishing, deburring, rust removal, paint removal and the like in iron plates, wood, plastics and tire industry surface grinding, ships, automobiles, grinding tools and aviation industry. Conventional pneumatic sanders are generally noisy and complex in construction, and therefore experience relatively poor in use.

Disclosure of Invention

The utility model aims to solve the technical problems of the prior art, and provides the pneumatic sander which is simple in structure, low in noise, good in polishing effect and comfortable in holding sense.

The technical scheme adopted for solving the technical problems is as follows:

a pneumatic sander comprises a sander body and a cylinder for driving a sanding assembly to rotationally sand, wherein the sander body is integrally formed with a handle part convenient to hold and an assembling part for assembling the sanding assembly and the cylinder; a main air inlet duct for supplying high-pressure air to the air cylinder and a main air outlet duct for discharging air discharged by the air cylinder are formed in the handle part, and an opening and closing valve assembly for closing the main air inlet duct in a normal state is arranged in the handle part; a trigger for pushing the opening and closing valve assembly to open the main air inlet duct is hinged below the assembly part; an air inlet joint with a speed regulation function is arranged at the orifice of the main air inlet duct; the orifice of the main exhaust duct is connected with a muffler for eliminating noise.

In order to optimize the technical scheme, the specific measures adopted further comprise:

the hole of the main exhaust duct is spirally provided with a silencer screw, and the silencer screw is formed with a connecting convex nozzle; the muffler is detachably connected with the connecting convex nozzle of the muffler screw in a plug-in manner; the connecting convex nozzle is sleeved with a muffler sealing ring, and the muffler is spirally provided with a locking screw for preventing the muffler from automatically falling off from the connecting convex nozzle.

A radial speed regulation valve hole is formed in the air inlet joint; the speed regulating valve hole is internally provided with a speed regulating valve for rotationally regulating the air inflow of the air inlet joint.

The handle part is sleeved with a handle sheath made of rubber materials.

The assembly part is formed with a through cavity in a front-back axial through manner, and the through cavity comprises a protection cavity for protecting a safety cover at the joint of the frosting component and the air cylinder and an air cylinder assembly cavity for installing the air cylinder; the cylinder is fixedly pressed in the cylinder assembly cavity of the assembly part through the body rear cover, the body rear cover is assembled with the rear cavity opening of the cylinder assembly cavity in a spiral mode, and the body rear cover is sleeved with a rear cover sealing ring for preventing air leakage.

The cylinder consists of a cylinder body, a cylinder body front end cover, a cylinder body rear end cover, a rotor, blades, a rotor front bearing and a rotor rear bearing; the front end cover of the cylinder body is fixedly arranged at the front end of the cylinder body, and the front bearing of the rotor is positioned and arranged in a bearing positioning hole formed in the front end cover of the cylinder body; the rear end cover of the cylinder body is fixedly arranged at the rear end of the cylinder body, and the rear bearing of the rotor is positioned and arranged in a bearing positioning hole formed in the rear end cover of the cylinder body; the rear end of the rotor is sleeved with the rotor rear bearing rotating support, and the front end of the rotor penetrates through the inner circle of the rotor front bearing and stretches into the protection cavity to be connected with the frosting component;

an elastic cylindrical pin for preventing the cylinder body rear end cover from rotating relative to the cylinder body is clamped between the cylinder body rear end cover and the cylinder body; an air inlet guide groove for guiding high-pressure air into the cylinder body and an air outlet guide groove for guiding out air which does work in the cylinder body are formed on the outer peripheral surface of the cylinder body; the handle part is formed with an air inlet inclined hole for communicating with the air inlet guide groove and an air outlet inclined hole for communicating with the air outlet guide groove.

The on-off valve assembly is arranged in an on-off valve cavity formed by the handle part and consists of a valve sleeve, an on-off pin spring and a compression screw; the valve sleeve is fixedly arranged in the opening and closing valve cavity, and an exhaust annular channel for communicating the exhaust inclined hole and the main exhaust duct is formed on the peripheral surface of the valve sleeve; the front end of the opening and closing pin slidably passes through a sleeve hole of the valve sleeve to be matched with the top joint of the trigger, the spring of the opening and closing pin is pressed and installed at the rear end of the opening and closing pin through a compression screw, the compression screw is spirally installed at a rear cavity opening of the opening and closing valve cavity, a compression sealing ring is sleeved on the compression screw, a conical sealing seat is formed at the rear end of the opening and closing pin, the conical sealing seat is matched with a rear port of the valve sleeve in a sealing manner to form a throat opening for controlling the on-off between the air inlet inclined hole and the main air inlet hole, and a valve seat sealing ring is sleeved on the conical sealing seat.

The grinding component consists of an eccentric wheel, a bearing seat and a grinding bearing; the rear end of the eccentric wheel is connected with the front end of the rotor in a sleeved transmission manner, the grinding bearing is positioned and installed in an eccentric hole of the eccentric wheel, a hole check ring for preventing the grinding bearing from falling out is clamped in the eccentric hole, and the bearing seat is installed in the inner circle of the grinding bearing in a tight fit manner.

The eccentric wheel is provided with a cylindrical locking screw for preventing the eccentric wheel from falling off the rotor; the trigger is hinged below the assembly part through a set screw.

Compared with the prior art, the utility model has the advantages that the air inlet connector with the speed regulating function is arranged on the main air inlet duct of the machine body, and the air inlet quantity of the air cylinder can be regulated by utilizing the speed regulating function of the air inlet connector, so that the torque force of the air cylinder can be controlled, and the aim of regulating the polishing force is fulfilled. The silencer is arranged on the main exhaust duct of the machine body, and can prevent sound from being transmitted and allow air flow to pass through, so that the silencer has the functions of silencing and reducing noise, and the aim of improving the polishing working environment is fulfilled.

Drawings

FIG. 1 is a schematic diagram of the structure of the present utility model;

FIG. 2 is an exploded view of the present utility model;

FIG. 3 is a schematic view of the structure of the machine body of the present utility model;

FIG. 4 is a schematic perspective view of the cylinder block of the present utility model;

fig. 5 is a schematic diagram of the route of the present utility model during air intake and exhaust.

Detailed Description

Embodiments of the present utility model are described in further detail below with reference to the accompanying drawings.

Fig. 1 to 5 are schematic structural views of the present utility model.

Wherein the reference numerals are as follows: the main intake duct a1, the intake inclined hole a2, the main exhaust duct b1, the set screw S, the handle cover X, the machine body 1, the handle portion 11, the on-off valve chamber 11c, the fitting portion 12, the protection chamber 12a, the cylinder fitting chamber 12b, the sanding block 2, the eccentric wheel 21, the bearing housing 22, the sanding bearing 23, the hole retainer 24, the cylinder lock screw 25, the cylinder 3, the cylinder 31, the intake guide groove 31a, the exhaust guide groove 31b, the cylinder front cover 32, the cylinder rear cover 33, the rotor 34, the vane 35, the rotor front bearing 36, the rotor rear bearing 37, the elastic cylindrical pin 38, the on-off valve assembly 4, the valve housing 41, the on-off pin 42, the on-off pin spring 43, the pressing screw 44, the exhaust annular groove 41b, the pressing seal ring 45, the valve seat seal 46, the trigger 5, the intake joint 6, the speed adjusting valve 61, the muffler 7, the lock screw 71, the muffler screw 8, the muffler seal 81, the body rear cover 9, and the rear cover seal 91.

As shown in fig. 1 to 5, the present utility model discloses a pneumatic sander comprising a body 1 and a cylinder 3 for driving a sanding assembly 2 to rotationally sand. The machine body 1 is a single piece formed with a handle portion 11 for easy hand-holding and an assembling portion 12 for assembling the sanding assembly 2 and the cylinder 3. The handle part 1 is internally provided with a main air inlet duct a1 and a main air outlet duct b1, the main air inlet duct a1 is used for conveying high-pressure air conveyed by an air source to the cylinder 3 for doing work, and the main air outlet duct b1 is used for guiding out the air doing work in the cylinder 3 and discharging the air into the air. The handle 11 is further provided with an on-off valve assembly 4 in a normally closed state, and the on-off valve assembly 4 is a switch and is used for controlling the on-off of the main air inlet duct a1. A trigger 5 is hinged below the fitting portion 12. When the trigger 5 is depressed, the trigger 5 can push the opening and closing valve assembly 4 to open the main intake duct a1. The air inlet joint 6 with the speed regulation function is arranged at the orifice of the main air inlet duct a1, the air inlet joint 6 with the speed regulation function not only can be conveniently connected with an air supply hose, but also can adjust the air supply amount, and the working torque of the air cylinder 3 can be changed by adjusting the air supply amount, so that the aim of adjusting the polishing force is fulfilled. The orifice of the main exhaust duct b1 is connected with the silencer 7 for eliminating noise, and the silencer 7 can eliminate noise so as to achieve the aim of improving the working environment.

In the embodiment, as shown in fig. 1 and 5, the orifice of the main exhaust duct b1 is spirally provided with a muffler screw 8, and the muffler screw 8 is formed with a connecting nipple; the muffler 7 is detachably connected with the connecting convex nozzle of the muffler screw 8 in a plug-in manner. The muffler 7 is installed on the machine body 1 through the muffler screw 8, so that the installation is convenient and quick, and the replacement and the maintenance are convenient. In order to prevent the air leakage phenomenon between the connection of the muffler 7 and the muffler screw 8, the muffler sealing ring 81 is sleeved on the connection lug of the muffler screw 8. The outer peripheral surface of the connecting convex nozzle of the muffler screw 8 is also provided with an anti-drop annular groove, and the muffler 7 is spirally provided with a locking screw 71. As can be seen from fig. 5, the locking screw 71 is caught in the anti-drop annular groove of the muffler screw 8, so that the muffler 7 is prevented from automatically dropping off from the connection nipple.

In the embodiment, a radial speed valve hole is formed in the air inlet joint 6, and as can be clearly seen in fig. 2, a speed valve 61 is installed in the speed valve hole of the air inlet joint 6. The valve rod of the speed regulating valve 61 penetrates through the axial hole of the air inlet joint 6, and the adjusting function of the air inlet joint 6 is realized by rotating the speed regulating valve 61 and controlling the opening degree of the axial hole of the air inlet joint 6 by using the speed regulating valve 61.

In the embodiment, as shown in fig. 2, a handle part 11 of the machine body 1 is sleeved with a handle sheath X made of rubber material. The handle cover X can increase the comfort of the user when holding.

As shown in fig. 3, the fitting portion 12 of the present utility model is formed with a through cavity including a protection cavity 12a and a cylinder fitting cavity 12b penetrating axially from front to rear. The protection cavity 12a is used for safely covering the connection part of the sanding assembly 2 and the air cylinder 3 so as to ensure the safety in use. The cylinder fitting chamber 12b is used for mounting the cylinder 3. The cylinder 3 is fixedly and pressed in the cylinder assembly cavity 12b of the assembly part 12 through the body rear cover 9, the body rear cover 9 is in spiral fit with the rear cavity opening of the cylinder assembly cavity 12b, and the body rear cover 9 is sleeved with a rear cover sealing ring 91 for preventing air leakage.

As shown in fig. 1 and 2, the cylinder 3 is assembled from a cylinder block 31, a cylinder block front end cover 32, a cylinder block rear end cover 33, a rotor 34, a vane 35, a rotor front bearing 36, and a rotor rear bearing 37. The cylinder front end cover 32 is fixedly arranged at the front end of the cylinder 31, and the rotor front bearing 36 is positioned and arranged in a bearing positioning hole formed in the cylinder front end cover 32. The cylinder rear end cover 33 is fixedly arranged at the rear end of the cylinder 31, and the rotor rear bearing 37 is positioned and arranged in a bearing positioning hole formed in the cylinder rear end cover 33. The rotor 34 is rotatably supported on a rotor front bearing 36 and a rotor rear bearing 37. The rear end of the rotor 34 is matched with the rotor rear bearing 37 in a rotating support manner, and the front end of the rotor 34 penetrates through the inner circle of the rotor front bearing 36 and extends into the protection cavity 12a to be connected with the grinding assembly 2.

In the embodiment, an elastic cylindrical pin 38 for preventing the cylinder rear end cover 33 from rotating relative to the cylinder 31 is clamped between the cylinder rear end cover 33 and the cylinder 31. As shown in fig. 4, an intake guide groove 31a for introducing high-pressure gas into the cylinder 31 and an exhaust guide groove 31b for guiding out the gas subjected to work in the cylinder 31 are formed on the outer peripheral surface of the cylinder 31. As shown in fig. 3, the handle portion 11 is formed with an intake inclined hole a2 for communicating with the intake guide groove 31a and an exhaust inclined hole (a broken line portion in fig. 3) for communicating with the exhaust guide groove 31b.

As shown in fig. 1 and 2, the on-off valve assembly 4 is mounted in an on-off valve chamber 11c formed in the handle portion 11, and the on-off valve assembly 4 is composed of a valve housing 41, an on-off pin 42, an on-off pin spring 43, and a hold-down screw 44. The valve housing 41 is fixedly installed in the opening and closing valve chamber 11c, and as shown in fig. 5, an outer peripheral surface of the valve housing 41 is formed with a vent annular channel 41b for communicating the vent inclined hole with the main vent hole b 1. The front end of the opening and closing pin 42 passes through the trepanning of the valve sleeve 41 in a sliding way to be matched with the propping joint of the trigger 5, the opening and closing pin spring 43 is pressed at the rear end of the opening and closing pin 42 through the compression screw 44, the compression screw 44 is spirally arranged at the rear cavity mouth of the opening and closing valve cavity 11c, the compression screw 44 is sheathed with the compression seal ring 45, the rear end of the opening and closing pin 42 is provided with a conical seal seat, the conical seal seat is matched with the rear port of the valve sleeve 41 in a sealing way to form a throat for controlling the on-off between the air inlet inclined hole a2 and the main air inlet channel a1, and the conical seal seat is sheathed with the valve seat seal ring 46.

In an embodiment, the abrasive grinding assembly 2 of the present utility model is comprised of an eccentric 21, a bearing housing 22, and a grinding bearing 23; the rear end of the eccentric wheel 21 is connected with the front end of the rotor 34 in a sleeved transmission manner, the grinding bearing 23 is positioned and arranged in an eccentric hole of the eccentric wheel 21, a hole check ring 25 for preventing the grinding bearing 23 from falling out is clamped in the eccentric hole, and the bearing seat 22 is arranged in the inner circle of the grinding bearing 23 in a tight fit manner.

The eccentric wheel 21 is provided with a cylindrical locking screw 26 for preventing the eccentric wheel 21 from falling off the rotor 34; the trigger 5 is hinged under the fitting portion 12 via a set screw S.

As shown in fig. 5, the working principle of the present utility model is: high-pressure air enters the main air inlet channel a1 through the air inlet joint 6, after the trigger 5 is pressed down, the trigger 5 pushes the opening and closing pin 42 to compress the opening and closing pin spring 43, the throat of the opening and closing valve assembly 4 is opened, the high-pressure air passes through the throat and enters the air inlet inclined hole a2 through the sleeve hole of the valve sleeve 41 and the radial hole formed by the valve sleeve 41, then enters the air cylinder 3 through the air inlet guide groove 31a, the rotor 34 is pushed to rotate by the high-pressure air acting on the blade 35, and the grinding assembly 2 is driven to rotate by the rotor 34. The gas subjected to work is discharged through the exhaust guide groove 31b, the exhaust inclined hole, the exhaust annular channel 41b, the main exhaust duct b1, the muffler screw 8 and the muffler 7 in this order.

The preferred embodiments of this utility model have been described so far that various changes or modifications may be made by one of ordinary skill in the art without departing from the scope of this utility model.

Claims

1. The pneumatic sander comprises a sander body (1) and a cylinder (3) for driving a sanding component (2) to rotationally sand, wherein the sander body (1) is integrally formed with a handle part (11) which is convenient to hold and an assembling part (12) for assembling the sanding component (2) and the cylinder (3); the method is characterized in that: the handle part (11) is provided with a main air inlet duct (a 1) for supplying high-pressure air to the air cylinder (3) and a main air outlet duct (b 1) for discharging air emitted by the air cylinder (3), and the handle part (11) is provided with an opening and closing valve assembly (4) for closing the main air inlet duct (a 1) in a normal state; a trigger (5) for pushing the opening and closing valve assembly (4) to open the main air inlet duct (a 1) is hinged below the assembly part (12); an air inlet joint (6) with a speed regulation function is arranged at the orifice of the main air inlet duct (a 1); the orifice of the main exhaust duct (b 1) is connected with a muffler (7) for eliminating noise.

2. The pneumatic sander of claim 1, wherein: the hole of the main exhaust duct (b 1) is spirally provided with a silencer screw (8), and the silencer screw (8) is formed with a connecting convex nozzle; the silencer (7) is detachably connected with the connecting convex nozzle of the silencer screw (8) in a plug-in manner; the connecting convex nozzle is sleeved with a muffler sealing ring (81), and the muffler (7) is spirally provided with a locking screw (71) for preventing the muffler (7) from automatically falling off from the connecting convex nozzle.

3. The pneumatic sander of claim 2, wherein: a radial speed regulation valve hole is formed in the air inlet joint (6); the speed regulating valve hole is internally provided with a speed regulating valve (61) for rotationally regulating the air inflow of the air inlet joint (6).

4. A pneumatic sander as set forth in claim 3, wherein: the handle part (11) is sleeved with a handle sheath (X) made of rubber materials.

5. The pneumatic sander of claim 4, wherein: the assembly part (12) is formed with a through cavity in a front-to-back axial through manner, and the through cavity comprises a protection cavity (12 a) for protecting a safety cover at the joint of the grinding component (2) and the air cylinder (3) and an air cylinder assembly cavity (12 b) for installing the air cylinder (3); the cylinder (3) is fixedly pressed in the cylinder assembly cavity (12 b) of the assembly part (12) through the body rear cover (9), the body rear cover (9) is spirally assembled with the rear cavity opening of the cylinder assembly cavity (12 b), and the body rear cover (9) is sleeved with a rear cover sealing ring (91) for preventing air leakage.

6. The pneumatic sander of claim 5, wherein: the cylinder (3) consists of a cylinder body (31), a cylinder body front end cover (32), a cylinder body rear end cover (33), a rotor (34), blades (35), a rotor front bearing (36) and a rotor rear bearing (37); the front end cover (32) of the cylinder body is fixedly arranged at the front end of the cylinder body (31), and the front bearing (36) of the rotor is positioned and arranged in a bearing positioning hole formed in the front end cover (32) of the cylinder body; the rear end cover (33) of the cylinder body is fixedly arranged at the rear end of the cylinder body (31), and the rear bearing (37) of the rotor is positioned and arranged in a bearing positioning hole formed in the rear end cover (33) of the cylinder body; the rear end of the rotor (34) is sleeved with a rotor rear bearing (37) in a rotating support mode, and the front end of the rotor (34) penetrates through the inner circle of the rotor front bearing (36) and stretches into the protection cavity (12 a) to be connected with the grinding assembly (2).

7. The pneumatic sander of claim 6, wherein: an elastic cylindrical pin (38) for preventing the cylinder body rear end cover (33) from rotating relative to the cylinder body (31) is clamped between the cylinder body rear end cover (33) and the cylinder body (31); an air inlet guide groove (31 a) for guiding high-pressure air into the cylinder body (31) and an air outlet guide groove (31 b) for guiding out air subjected to work in the cylinder body (31) are formed on the outer peripheral surface of the cylinder body (31); the handle part (11) is formed with an air inlet inclined hole (a 2) for communicating with the air inlet guide groove (31 a) and an air outlet inclined hole for communicating with the air outlet guide groove (31 b).

8. The pneumatic sander of claim 7, wherein: the on-off valve assembly (4) is arranged in an on-off valve cavity (11 c) formed by the handle part (11), and the on-off valve assembly (4) consists of a valve sleeve (41), an on-off pin (42), an on-off pin spring (43) and a compression screw (44); the valve sleeve (41) is fixedly arranged in the opening and closing valve cavity (11 c), and an exhaust annular channel (41 b) for communicating the exhaust inclined hole with the main exhaust duct (b 1) is formed on the outer peripheral surface of the valve sleeve (41); the front end of the opening and closing pin (42) slidably passes through a sleeve hole of the valve sleeve (41) to be matched with the propping joint of the trigger (5), the opening and closing pin spring (43) is pressed at the rear end of the opening and closing pin (42) through a compression screw (44), the compression screw (44) is spirally arranged at a rear cavity opening of the opening and closing valve cavity (11 c), the compression screw (44) is sleeved with a compression sealing ring (45), the rear end of the opening and closing pin (42) is provided with a conical sealing seat, the conical sealing seat is matched with a rear port of the valve sleeve (41) in a sealing way to form a throat opening for controlling the on-off between the air inlet inclined hole (a 2) and the main air inlet channel (a 1), and the conical sealing seat is sleeved with a valve seat sealing ring (46).

9. The pneumatic sander of claim 8, wherein: the grinding component (2) consists of an eccentric wheel (21), a bearing seat (22) and a grinding bearing (23); the rear end of the eccentric wheel (21) is connected with the front end of the rotor (34) in a sleeved transmission manner, the grinding bearing (23) is positioned and installed in an eccentric hole of the eccentric wheel (21), a hole check ring (25) for preventing the grinding bearing (23) from falling off is clamped in the eccentric hole, and the bearing seat (22) is installed in the inner circle of the grinding bearing (23) in a tight fit manner.

10. The pneumatic sander of claim 9, wherein: the eccentric wheel (21) is provided with a cylindrical locking screw (26) for preventing the eccentric wheel (21) from falling off the rotor (34); the trigger (5) is hinged below the assembly part (12) through a set screw (S).