Pneumatic tool changing mechanism of motor

Abstract

The utility model discloses a pneumatic tool changing mechanism of a motor. The pneumatic tool changing mechanism comprises a pull rod driving device, an elastic recovery piece, a driving shaft, a tool handle and a pull rod arranged in an axial hole of the driving shaft, the pull rod driving device comprises a driving part and a sliding pressing sleeve which is driven by the driving part and can slide on the driving shaft, and the sliding pressing sleeve is connected with the pull rod; a piston of the air cylinder is provided with a main body part located in a cylinder body and a lower extending part extending out of the lower end of the cylinder body. The piston is provided with a center hole penetrating through the main body part and the lower extending part, the driving shaft penetrates through the center hole and the cylinder body to be connected with the output shaft, and the lower extending part acts on the upper end face of the sliding pressing sleeve. The pull rod driving device is arranged inside, so that the space is saved; the piston directly acts on the sliding pressing sleeve to drive the pull rod to move downwards, and the motion trails of the piston and the sliding pressing sleeve are both straight lines and are parallel, so that the piston rod drives the pull rod to move downwards more stably and smoothly, and the clamping stagnation phenomenon is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of grinding head motors, and in particular to a motor-driven pneumatic tool changing mechanism. Background Technology

[0002] Grinding head motors are mainly used in the glass deep processing industry to grind glass corners. Due to the special working conditions and performance requirements, the grinding wheel will wear out after a period of use. At this time, it is necessary to replace the tool, that is, replace the tool handle with the grinding wheel.

[0003] The Chinese utility model patent with announcement number CN217741496U once disclosed a motor quick tool change mechanism. The motor quick tool change mechanism drives the pull rod to move downward through a pull rod driving device. The pull rod driving device is composed of a rocker arm and a power source for driving the rocker arm. Among them, the power source of the pull rod driving device is external. The shaft housing of the motor quick tool change mechanism is fixed to the lower end of the motor, and the power source is arranged outside the shaft housing, which increases the overall volume of the motor quick tool change mechanism and occupies a large space. In addition, under the drive of the power source, the pressure head of the rocker arm swings up and down to form an arc trajectory. Since the motion trajectory of the pull rod is a straight line and the motion trajectory of the pressure head of the rocker arm is a circular arc trajectory, the rocker arm may get stuck in the process of the rocker arm driving the pull rod to move downward, so that the motor quick tool change mechanism cannot smoothly perform the tool change work. Contents of utility model

[0004] The purpose of the utility model is to provide a motor-pneumatic tool-changing mechanism, which can realize the internal integration of the pull rod drive device, save space, and prevent the mechanism from getting stuck.

[0005] The purpose of this utility model can be achieved through the following technical solutions:

[0006] A motor-pneumatic tool-changing mechanism, comprising a pull rod drive device, a drive shaft connected to the output shaft at the lower end of a motor, a pull rod arranged in an axial hole of the drive shaft, and a tool handle inserted into the lower end of the drive shaft, a pull claw installed at the lower end of the pull rod clamps or releases the tool handle through an action hole at the lower end of the axial hole, an elastic return member is arranged between the pull rod and the axial hole, the pull rod drive device comprises a drive member and a sliding sleeve driven by the drive member to slide on the drive shaft, and the sliding sleeve is connected to the pull rod;

[0007] The driving member is a cylinder, the piston of which has a main body located inside the cylinder body and a lower extension extending from the lower end of the cylinder body; the piston has a center hole penetrating the main body and the lower extension, the driving shaft passes through the center hole and the cylinder body and is connected to the output shaft, and the lower extension acts on the upper end surface of the sliding sleeve.

[0008] By integrating the pull rod drive device, the volume of the motor pneumatic tool changing mechanism is effectively reduced, saving space. The pull rod drive device directly acts on the sliding bush through the piston to drive the pull rod to move downward. The movement trajectories of the piston and the sliding bush are both straight lines and parallel, making the piston drive the pull rod to move downward more smoothly and avoiding jamming.

[0009] As a further solution of the present utility model, the piston further has an upper protruding portion extending from the upper end of the cylinder block, and the central hole also penetrates through the upper protruding portion. With the above solution, through the cooperation between the upper and lower protruding portions and the cylinder block, the piston can slide up and down more smoothly.

[0010] As a further solution of the present utility model, buffer pads are respectively fixed on the upper and lower end faces of the main body portion. With the above structure, during the process of the piston sliding up and down, the buffer pads can effectively prevent direct collision between the end face of the piston and the cylinder block, prolonging the service life of the air cylinder.

[0011] As a further solution of the present utility model, the piston divides the inner cavity of the cylinder block into independent upper and lower chambers, and the upper air port and the lower air port on the cylinder block are respectively communicated with the corresponding upper and lower chambers. With the above structure, by injecting air into the upper chamber through the upper air port, the piston can be driven to move downward.

[0012] As a further solution of the present utility model, the cylinder block includes a cylinder barrel and cylinder block upper end covers and cylinder block lower end covers fixed at the upper and lower ends of the cylinder barrel. With the above solution, the cylinder block is easier to process and manufacture.

[0013] As a further solution of the present utility model, the upper air port is opened on the cylinder block upper end cover, and the lower air port is opened on the cylinder block lower end cover.

[0014] As a further solution of the present utility model, the upper end of the cylinder block is fixed to the lower end cover of the motor through a connecting sleeve, and a through hole for the output shaft and the drive shaft to pass through is opened on the connecting sleeve; the lower end of the cylinder block is fixed with a shaft housing, the drive shaft is supported and installed in the shaft hole of the shaft housing through a bearing, and the sliding bush is placed in the shaft hole of the shaft housing. With the above solution, the cylinder block is effectively fixed on the motor pneumatic tool changing mechanism.

[0015] As a further solution of the present utility model, the sliding bush is composed of a lower bush and an upper bush sleeved on the drive shaft clamping a connecting piece; a window is opened on the side wall of the drive shaft, the window is located above the elastic restoring member, and the connecting piece passes through the window and is connected to the pull rod. With the above solution, the sliding bush is connected to the pull rod, and the sliding bush can move up and down on the drive shaft.

[0016] As a further solution of the present utility model, a keyway is provided at the upper end of the pull rod, the connecting member is a key installed in the keyway, and both ends of the key pass through the driving shaft through the window and are placed in the assembly groove of the upper pressing sleeve. With the above solution, the sliding pressing sleeve and the pull rod are effectively connected.

[0017] As a further solution of the present utility model, the acting hole is divided into a thick hole part located at the lower part, a thin hole part located at the upper part, and a transition part located between the thick hole part and the thin hole part. With the above solution, the claw placed in the acting hole can clamp or loosen the tool holder.

[0018] Beneficial effects of the present utility model:

[0019] Compared with the external pull rod driving device in the prior art, the pull rod driving device of the present utility model is built-in and placed between the motor and the shaft housing, effectively reducing the volume of the motor pneumatic tool changing mechanism and saving space;

[0020] The pull rod driving device of the present utility model directly acts on the sliding pressing sleeve through the piston to drive the pull rod to move downward, and the movement trajectories of the piston and the sliding pressing sleeve are both straight lines and parallel, making the piston drive the pull rod to move downward more smoothly and avoiding jamming phenomena, so that the motor quick tool changing mechanism can smoothly perform the tool changing work. Brief description of the drawings

[0021] The present utility model will be further described below with reference to the drawings:

[0022] Figure 1 is the structural schematic diagram of the present utility model;

[0023] Figure 2 is the structural schematic diagram of the cylinder block and the piston in the present utility model;

[0024] Figure 3 is the structural schematic diagram of the pull rod in the present utility model;

[0025] Figure 4 is the structural schematic diagram of the driving shaft in the present utility model;

[0026] Figure 5 is the schematic diagram of the sliding pressing sleeve in the present utility model.

[0027] The reference numerals therein are:

[0028] 10. Motor; 11. Output shaft; 12. Connecting sleeve;

[0029] 20. Drawbar drive device; 21. Cylinder block; 211. Cylinder barrel; 212. Lower end cover of cylinder block; 213. Upper end cover of cylinder block; 22. Piston; 221. Buffer pad; 23. Sliding compression sleeve; 231. Connecting piece; 232. Lower compression sleeve; 233. Upper compression sleeve; 234. Assembly groove; 24. Lower air port; 241. Outer lower air port; 242. Inner lower air port; 25. Upper air port; 251. Outer upper air port; 252. Inner upper air port;

[0030] 30. Shaft housing; 31. Gland;

[0031] 40. Drive shaft; 41. Conical mounting port; 42. Action hole; 421. Coarse hole part; 422. Fine hole part; 423. Transition part; 43. Guide hole; 44. Spring hole; 45. Window;

[0032] 50. Drawbar; 51. Rod body; 52. Upper end head; 521. Keyway; 53. Pull claw;

[0033] 60. Tool holder;

[0034] 70. Elastic restoring piece;

[0035] 80. Pull stud. Detailed implementation manners

[0036] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0037] A motor pneumatic tool change mechanism, please refer to Figure 1 as shown, including a motor 10, a drawbar drive device 20, a shaft housing 30, a drive shaft 40, a drawbar 50, a tool holder 60, and an elastic restoring piece 70.

[0038] The drawbar drive device 20 includes a driving member and a sliding compression sleeve 23. The driving member is a cylinder, which is composed of a cylinder block 21 and a piston 22 slidably assembled in the inner cavity of the cylinder block 21. The sliding compression sleeve 23 is placed below the driving member. The driving member is used to drive the sliding compression sleeve 23 to slide on the drive shaft 40.

[0039] Among them, please refer to Figure 1 and Figure 2 as shown, the piston 22 can slide up and down in the inner cavity of the cylinder block 21, and its movement trajectory is a straight line. The piston 22 sliding up and down divides the inner cavity of the cylinder block 21 into independent upper and lower chambers. Correspondingly, the cylinder block 21 is provided with an upper air port 25 communicating with the upper chamber and a lower air port 24 communicating with the lower chamber.

[0040] In this embodiment, the cylinder block 21 includes a cylinder barrel 211 and cylinder head covers 213 and 212 fixed to the upper and lower ends of the cylinder barrel 211. A sealing ring is provided between the upper end of the cylinder barrel 211 and the cylinder head cover 213. A sealing ring is provided between the lower end of the cylinder barrel 211 and the cylinder head cover 213. Through holes are respectively provided on the cylinder head covers 213 and 212 for the upper and lower ends of the piston 22 to pass through.

[0041] Further, the upper air port 25 is opened on the cylinder head cover 213. The upper air port 25 is composed of two connected sections, namely an outer upper air port 251 and an inner upper air port 252. The outer upper air port 251 is opened on the outer side wall of the cylinder head cover 213. The inner upper air port 252 is opened on the lower end face of the cylinder head cover 213. Preferably, the inner upper air port 252 is annular so that the gas in the inner upper air port 252 can uniformly flow into the upper chamber. The lower air port 24 is opened on the cylinder head cover 212. The lower air port 24 is composed of two connected sections, namely an outer lower air port 241 and an inner lower air port 242. The outer lower air port 241 is opened on the outer side wall of the cylinder head cover 212. The inner lower air port 242 is opened on the upper end face of the cylinder head cover 212.

[0042] Wherein, the piston 22 is composed of a main body portion and upper and lower protruding portions fixed to the upper and lower ends of the main body portion. The three are coaxially arranged, and the outer diameter of the main body portion is the largest. The piston 22 has a central hole passing through the main body portion and the upper and lower protruding portions. The drive shaft 40 passes through the central hole and the cylinder block 21 and is connected to the output shaft 11.

[0043] In this embodiment, a through hole for the upper protruding portion to pass through is opened on the cylinder head cover 213. The upper end of the upper protruding portion passes through the through hole and extends to the outside of the cylinder block 21. A sealing ring is provided between the cylinder head cover 213 and the upper protruding portion, and the sealing ring is fixed to the cylinder head cover 213. A sealing ring is provided between the side wall of the main body portion and the inner side wall of the cylinder block 21, and the sealing ring is fixed to the main body portion. A through hole for the lower protruding portion to pass through is opened on the cylinder head cover 212. The lower end of the lower protruding portion passes through the through hole and extends to the outside of the cylinder block 21. The lower end face of the lower protruding portion acts on the upper end face of the sliding bush 23. A sealing ring is provided between the cylinder head cover 212 and the lower protruding portion, and the sealing ring is fixed to the cylinder head cover 212.

[0044] Further, buffer pads 221 are respectively fixed to the upper and lower end faces of the main body portion. The buffer pads 221 are respectively sleeved on the upper and lower protruding portions. During the up and down sliding of the piston 22, the buffer pads 221 are used to prevent direct collision between the end face of the piston 22 and the cylinder block 21, and to extend the service life of the cylinder. In this embodiment, the buffer pads 221 can be shock-absorbing rubber pads.

[0045] Please refer toFigure 1 As shown, the output shaft 11 of the motor 10 is located at the lower end of the motor 10. The upper end of the upper end cover 213 of the cylinder block is fixed to the lower end cover of the motor 10 through a connecting sleeve 12, and a through hole for the output shaft 11 and the drive shaft 40 to pass through is provided on the connecting sleeve 12. The shaft housing 30 is fixed to the lower end of the lower end cover 212 of the cylinder block. The drive shaft 40 is supported and installed in the shaft hole of the shaft housing 30 through bearings. The upper end of the drive shaft 40 sequentially passes through the shaft hole of the shaft housing 30, the central through hole of the piston 22, and the through hole of the connecting sleeve 12, and is connected to the output shaft 11 through a coupling. A ring-shaped gland 31 is fixed to the lower end of the shaft housing 30. A through hole for the lower end of the drive shaft 40 to pass through is provided on the gland 31, and a skeleton oil seal is assembled in the through hole to realize the sealed rotation assembly of the lower end of the drive shaft 40 and the gland 31.

[0046] An axial hole is provided in the center of the drive shaft 40. The axial hole is divided into a tapered mounting port 41, a working hole 42, a guiding hole 43, and a spring hole 44 from bottom to top. The aperture of the tapered mounting port 41 is smaller at the top and larger at the bottom. The apertures of the spring hole 44 and the working hole 42 are both larger than the aperture of the guiding hole 43. A lower step is formed at the junction of the spring hole 44 and the guiding hole 43. The lower section of the working hole 42 is divided into a thick hole section 421 located at the lower part, a thin hole section 422 located at the upper part, and a transition section 423 located between the thick hole section 421 and the thin hole section 422.

[0047] Please refer to Figure 3 As shown, a pull rod 50 is arranged in the axial hole of the drive shaft 40. Specifically, the pull rod 50 includes a rod body 51 and an upper end head 52. The upper end head 52 is fixed to the upper end of the rod body 51, and the outer diameter of the upper end head 52 is larger than the outer diameter of the rod body 51. An upper step is formed at the junction of the upper end head 52 and the rod body 51. The upper end head 52 is placed in the spring hole 44. The lower end of the rod body 51 is placed in the working hole 42. A claw 53 is provided at the lower end of the rod body 51, and the claw 53 is installed at the lower end of the rod body 51 through threaded connection. The claw 53 is located in the working hole 42.

[0048] Please refer to Figure 1 As shown, the lower part of the tool shank 60 is used to install a grinding wheel. The upper part of the tool shank 60 is inserted into the tapered mounting port 41 of the drive shaft 40. Specifically, a tapered connecting part adapted to the tapered mounting port 41 is provided on the upper part of the tool shank 60. A pull stud 80 is threadedly connected to the upper end of the tapered connecting part. The pull stud 80 has a protruding stud head. The claw 53 has an elastic claw part for loosening or clamping the stud head of the pull stud 80. The elastic claw part of the claw 53 clamps or loosens the pull stud 80 through the working hole 42.

[0049] An elastic restoring member 70 is arranged between the rod body 51 and the spring hole 44 for driving the pull rod 50 to move upward. In this embodiment, the elastic restoring member 70 is a disc spring, which is sleeved on the rod body 51, and both ends of the disc spring are blocked by the lower step and the upper step respectively.

[0050] Please refer to Figure 1 and Figure 4 As shown in FIG. 1 , a window 45 is provided on the side wall of the drive shaft 40. The window 45 is located above the elastic return member 70 and passes through the circumference of the drive shaft 40. The sliding sleeve 23 is sleeved on the drive shaft 40, and the connecting member 231 of the sliding sleeve 23 passes through the window 45 and is connected to the pull rod 50. The lower end surface of the lower extension acts on the upper end surface of the sliding sleeve 23 to drive the pull rod 50 to move downward.

[0051] In this example, please refer to Figure 5 As shown in , the sliding pressing sleeve 23 is composed of a lower pressing sleeve 232 sleeved on the driving shaft 40 and an upper pressing sleeve 233 clamping a connecting piece 231. Specifically, the connecting piece 231 is a key. Please refer to Figure 3 As shown in FIG. 1 , a keyway 521 for placing the connecting piece 231 is provided on the upper end 52 of the pull rod 50. The connecting piece 231 is installed in the keyway 521 and is fixed to the upper end 52 by bolts. Both ends of the connecting piece 231 extend to the outside of the drive shaft 40 through the window 45 and are placed in the assembly groove 234 of the lower pressing sleeve 232. The lower pressing sleeve 232 and the upper pressing sleeve 233 are clamped together to clamp the connecting piece 231, so as to realize the connection between the sliding pressing sleeve 23 and the pull rod 50.

[0052] The working mode of the motor-pneumatic tool changing mechanism is as follows:

[0053] When the tool needs to be changed, gas is injected into the upper chamber of the cylinder 21 through the upper air port 25 of the pull rod drive device 20 to make the piston 22 move downward, and the gas in the lower chamber of the cylinder 21 is discharged through the lower air port 24; the piston 22 moving downward acts on the sliding sleeve 23 through the lower extension to drive the pull rod 50 to move downward, so that the elastic claw of the pull claw 53 enters the rough hole 421 of the action hole 42, and the elastic claw opens, and the elastic claw no longer tightly clamps the nail head of the pull nail 80, so that the old tool handle 60 is separated from the pull rod 50 and can be removed from the drive shaft 40.

[0054] Insert the pull pin 80 of the new tool handle 60 into the action hole 42, stop injecting gas into the upper chamber of the cylinder body 21, that is, stop the pull rod driving device 20 from pressing the pull rod 50; under the rebound action of the elastic recovery member 70, the pull rod 50 will move upward, thereby driving the elastic claw portion of the pull claw 53 to enter the fine hole portion 422 of the action hole 42, allowing the elastic claw portion to contract to tighten the nail head of the pull pin 80, so that the pull pin 80 is fixed on the drive shaft 40, and the tool change is completed. In the process of the pull rod 50 moving upward, the pull rod 50 indirectly drives the piston 22 to move upward through the sliding sleeve 23 to achieve the reset of the piston 22.

[0055] ​​​​After the tool is changed, the elastic claw of the pull claw 53 is always placed in the fine hole 422 because the elastic recovery member 70 is always in effect. Therefore, the elastic claw will always tighten the nail head of the pull nail 80, maintain the connection between the handle 60 and the pull rod 50, and make the handle 60 always located on the drive shaft 40 to prevent the handle 60 from falling off.

[0056] After the tool is changed, the drive shaft 40 drives the tool handle 60 to rotate under the drive of the motor 10, thereby causing the grinding wheel mounted on the tool handle 60 to rotate to grind the edges and corners of the glass.

[0057] The utility model realizes the clamping or releasing of the pull claw on the pull nail on the upper end of the tool handle by driving the pull rod drive device and the elastic return member; compared with the external pull rod drive device in the prior art, the pull rod drive device of the utility model is internal and placed between the motor and the shaft housing, which effectively reduces the volume of the motor pneumatic tool changing mechanism and saves space; the pull rod drive device of the utility model directly acts on the sliding sleeve through the piston to drive the pull rod to move downward. The movement trajectory of the piston and the movement trajectory of the sliding sleeve are both straight and parallel, so that the piston drives the pull rod to move downward more smoothly and avoids the occurrence of jamming, so that the motor quick tool changing mechanism can smoothly perform the tool changing work.

[0058] The above is a detailed description of an embodiment of the utility model, but the content described is only a preferred embodiment of the utility model and cannot be considered to limit the scope of implementation of the utility model. All equivalent changes and improvements made within the scope of application of the utility model should still fall within the scope of patent protection of the utility model.

Claims

1. A motor-pneumatic tool changing mechanism, comprising a pull rod drive device (20), a drive shaft (40) connected to an output shaft (11) of a motor (10), a pull rod (50) arranged in an axial hole of the drive shaft (40), and a tool handle (60) inserted into the lower end of the drive shaft (40), a pull claw (53) installed at the lower end of the pull rod (50) clamps or releases the tool handle (60) through an action hole (42) at the lower end of the axial hole, an elastic return member (70) is provided between the pull rod (50) and the axial hole, the pull rod drive device (20) comprises a drive member and a sliding sleeve (23) driven by the drive member to slide on the drive shaft (40), the sliding sleeve (23) is connected to the pull rod (50), and is characterized in that: The driving member is a cylinder, and the piston (22) of the cylinder has a main body located inside the cylinder body (21) and a lower extension portion extending from the lower end of the cylinder body (21); the piston (22) has a center hole passing through the main body and the lower extension portion, the driving shaft (40) passes through the center hole and the cylinder body (21) and is connected to the output shaft (11), and the lower extension portion acts on the upper end surface of the sliding sleeve (23).

2. The motor-pneumatic tool changing mechanism according to claim 1, characterized in that: The piston (22) also has an upper protruding portion extending from the upper end of the cylinder body (21), and the central hole also passes through the upper protruding portion.

3. The motor-pneumatic tool changing mechanism according to claim 1, characterized in that: Buffer pads (221) are respectively fixed on the upper and lower end surfaces of the main body.

4. The motor-pneumatic tool changing mechanism according to claim 1, characterized in that: The piston (22) divides the inner cavity of the cylinder body (21) into upper and lower chambers that are independent of each other, and the upper air port (25) and the lower air port (24) on the cylinder body (21) are respectively connected to the corresponding upper and lower chambers.

5. The motor-pneumatic tool changing mechanism according to claim 4, characterized in that: The cylinder body (21) comprises a cylinder barrel (211) and a cylinder body upper end cover (213) and a cylinder body lower end cover (212) fixed at the upper and lower ends of the cylinder barrel (211).

6. The motor-pneumatic tool changing mechanism according to claim 5, characterized in that: The upper air port (25) is provided on the upper end cover (213) of the cylinder body, and the lower air port (24) is provided on the lower end cover (212) of the cylinder body.

7. The motor-pneumatic tool changing mechanism according to claim 1, characterized in that: The upper end of the cylinder body (21) is fixed to the lower end cover of the motor (10) via a connecting sleeve (12), and a through hole is provided on the connecting sleeve (12) for the output shaft (11) and the drive shaft (40) to pass through; a shaft housing (30) is fixed to the lower end of the cylinder body (21), and the drive shaft (40) is supported and installed in the shaft hole of the shaft housing (30) via a bearing, and the sliding sleeve (23) is placed in the shaft hole of the shaft housing (30).

8. The motor-pneumatic tool changing mechanism according to claim 1, characterized in that: The sliding pressure sleeve (23) is composed of a lower pressure sleeve (232) and an upper pressure sleeve (233) which are sleeved on the driving shaft (40) and clamp a connecting piece (231); a window (45) is opened on the side wall of the driving shaft (40), and the window (45) is located above the elastic return piece (70), and the connecting piece (231) passes through the window (45) to be connected to the pull rod (50).

9. The motor-pneumatic tool changing mechanism according to claim 8, characterized in that: A keyway (521) is provided on the upper end (52) of the pull rod (50), and the connecting member (231) is a key installed in the keyway (521). Both ends of the key pass through the window (45) out of the drive shaft (40) and are placed in the assembly groove (234) of the upper pressure sleeve (233).

10. The motor-pneumatic tool changing mechanism according to claim 1, characterized in that: The active hole (42) is divided into a coarse hole portion (421) located at the bottom, a fine hole portion (422) located at the top, and a transition portion (423) located between the coarse hole portion (421) and the fine hole portion (422).

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