Quick-change structure of swing shovel saw blade

Abstract

The utility model belongs to the technical field of electric tools, and particularly relates to a quick-changing structure of a swing shovel saw blade, which comprises a head shell, an output shaft and a locking piece, the bottom end of the output shaft is exposed out of the head shell and is provided with a clamping part, the bottom end of the locking piece is provided with a locking pressing plate, and the locking pressing plate is positioned below the clamping part. A locking space used for installing a saw blade is formed between the locking pressing plate and the clamping part, the locking piece comprises a push-pull rod and a locking rod, the locking pressing plate is arranged at the bottom end of the locking rod, a disassembly and assembly groove channel is formed in the push-pull rod and comprises a separation groove channel and a locking groove channel which are communicated with each other, and the locking rod is provided with a locking part. The locking part can be arranged in the locking groove channel, a trigger is rotationally arranged on the head shell, an eccentric block is arranged on the trigger, the eccentric block abuts against the top end of the push-pull rod, and a reset spring is further arranged in the output shaft. And the production and manufacturing cost of the swing shovel can be reduced.

Description

Technical Field

[0001] This utility model belongs to the field of power tool technology, and specifically refers to a quick-change structure for a swing saw blade. Background Technology

[0002] A swivel saw, also known as a multi-tool, is a reciprocating swivel motorized tool. A motor inside the housing drives a blade connected to an output shaft in a reciprocating motion. By changing the blade mounted on the head, the swivel saw can perform multiple functions such as cutting, grinding, scraping, rough filing, and polishing, offering convenience and practicality. Traditional multi-functional swivel saw blades are mostly assembled using a pressure plate and Allen screws. The installation and replacement of the saw blade are achieved by loosening or tightening the Allen screws with an Allen wrench. Users need to carry an Allen wrench at all times. This method of saw blade installation is cumbersome, time-consuming, and labor-intensive, and also prone to the loss of the Allen wrench. Therefore, subsequent industry professionals have made some improvements, such as Chinese patent CN2. The 16541198U saw blade is loaded and unloaded using a spring collet and a locking block. Loading and unloading the saw blade only requires rotating the quick-change lever to remove the locking rod, replacing the saw blade on the locking rod, and then reinstalling the locking rod and rotating the quick-change lever to tighten it. However, this type of spring collet has a complex structure and manufacturing process. To ensure the elasticity of the spring collet, it requires complex heat bending treatment, which increases the production cost. Furthermore, this method of clamping the saw blade using the spring collet and locking block is unreliable; the saw blade is prone to loosening during operation. Summary of the Invention

[0003] The purpose of this utility model is to provide a quick-change structure for the oscillating shovel saw blade, which is simple in structure and can be quickly and easily installed by turning the trigger. It is easy to operate, saves time and effort, and can reduce the manufacturing cost of the oscillating shovel. It also allows the locking plate to work with the clamping part to firmly clamp the saw blade, thereby preventing the saw blade from loosening during the operation of the oscillating shovel.

[0004] The purpose of this utility model is achieved as follows:

[0005] A quick-change structure for a swing saw blade includes a head shell, an output shaft disposed within the head shell, and a locking member movably disposed within the output shaft. The bottom end of the output shaft protrudes from the head shell and has a clamping portion. The bottom end of the locking member has a locking pressure plate located below the clamping portion, forming a locking space for installing the saw blade between the locking pressure plate and the clamping portion. Driving the locking member to move the locking pressure plate away from or towards the clamping portion allows for the disassembly and installation of the saw blade. The locking member includes a push-pull rod and a locking rod disposed within the output shaft. The locking pressure plate is disposed at the bottom end of the locking rod. The push-pull rod has a disassembly / assembly channel, which includes an interconnected release channel and a locking channel. The locking rod has a locking part, which can be located in the locking channel. After the locking rod is driven to rotate relative to the push-pull rod, the locking part can enter the disengagement channel from the locking channel. At this time, the locking rod can separate from the push-pull rod. The head shell is rotatably equipped with a trigger, which is equipped with an eccentric block. The eccentric block abuts against the top of the push-pull rod. Driving the trigger to rotate can drive the push-pull rod to move downward through the eccentric block. At this time, the push-pull rod drives the locking rod to move downward, thereby moving the locking pressure plate away from the clamping part. The output shaft is also equipped with a return spring for driving the push-pull rod to move upward. The upward movement of the push-pull rod can control the upward movement of the locking rod, thereby moving the locking pressure plate closer to the clamping part.

[0006] Furthermore, the inner wall of the locking channel is recessed to form a limiting groove, and the locking part can be located within the limiting groove.

[0007] Furthermore, the bottom end of the push-pull rod is provided with an installation groove. There are two disassembly and assembly channels, namely a left disassembly and assembly channel and a right disassembly and assembly channel. Both the left and right disassembly and assembly channels are opened on the inner wall of the installation groove. Both the left and right disassembly and assembly channels include a release channel and a locking channel. The release channel and the locking channel are connected to form an "L" shape. The top end of the locking rod is located in the installation groove. The top end of the locking rod is provided with an installation hole. The locking part is a locking shaft. The locking shaft is fixedly installed in the installation hole, and both ends of the locking shaft are exposed in the installation hole and located in the locking channel.

[0008] Furthermore, the inner wall of the output shaft is provided with a mounting platform, and the two ends of the return spring abut against the mounting platform and the bottom end of the push-pull rod, respectively. A limit groove is formed in the inner wall of the output shaft, and a limit ring is provided in the limit groove. A limit platform is provided on the push-pull rod, and the limit platform can abut against the limit ring.

[0009] Furthermore, the head shell has a through hole, the output shaft is disposed in the through hole, the inner wall of the through hole has a bearing mounting groove, the bearing mounting groove is provided with a bearing, and the bearing is sleeved on the output shaft.

[0010] Furthermore, one end of the trigger is rotatably disposed in a rotating groove, a rotating rod is disposed in the rotating groove, a rotating hole is opened on the trigger, the rotating rod is disposed in the rotating hole, the eccentric block is sleeved on the rotating rod, a fixing groove is opened on one end of the trigger, the eccentric block is located in the fixing groove, a connecting part is provided in the fixing groove, a connecting groove is opened on the eccentric block, and the connecting part is disposed in the connecting groove and abuts against the eccentric block.

[0011] Furthermore, the head shell is also provided with a drive mechanism for driving the output shaft to rotate. The drive mechanism includes a shift fork and a drive motor. The shift fork is sleeved on the output shaft and fixedly connected to the output shaft. The drive motor is provided with a motor shaft. An eccentric rod is eccentrically provided on the motor shaft. A drive wheel is provided on the eccentric rod. The shift fork is provided with an opening. The drive wheel is located in the opening and abuts against the shift fork.

[0012] The outstanding and beneficial technical effects of this utility model compared to the prior art are:

[0013] This utility model belongs to the field of power tool technology, specifically referring to a quick-change structure for a swing saw blade. It includes a head housing, an output shaft housed within the head housing, and a locking member movably housed within the output shaft. The bottom end of the output shaft protrudes from the head housing and has a clamping portion. The locking plate at the bottom of the locking member is located below the clamping portion, and a locking space for installing the saw blade is formed between the locking plate and the clamping portion. This allows the saw blade to be smoothly installed between the locking plate and the clamping portion. When the user drives the locking member downwards, the locking plate at the bottom of the locking member moves away from the clamping portion, allowing the saw blade to be easily removed from the locking space. When the user places a new saw blade into the locking space, driving the locking member upwards will cause the locking plate at the bottom of the locking member to move synchronously. The saw blade moves upward, bringing the locking plate closer to the clamping part. The locking plate and clamping part work together to lock the saw blade within the locking space, completing the saw blade installation. The locking mechanism consists of a push-pull rod and a locking rod, both housed within the output shaft. The locking plate is located at the bottom of the locking rod. The push-pull rod has a disassembly / removal groove consisting of a release groove and a locking groove. The locking rod has a locking part; when this locking part is within the locking groove, the locking rod and push-pull rod are locked together. Since the trigger rotation is located on the head housing, and the eccentric block on the trigger abuts against the top of the push-pull rod, when the user drives the trigger, the trigger rotates synchronously with the eccentric block. The eccentric block pushes the push-pull rod downward, thus... This will cause the locking rod to move downwards synchronously. At this time, the locking pressure plate at the bottom of the locking rod will move away from the clamping part, thereby allowing the saw blade located in the locking space to be removed. This type of saw blade is a common type of cutting saw blade on the market, with a "U"-shaped opening on the blade. Because there is a return spring inside the output shaft to drive the push-pull rod to move upwards, when the locking rod and push-pull rod move downwards, the return spring will enter a compressed state. When the user places this type of saw blade into the locking space, and then the user drives the trigger to reset, the compressed return spring will push the locking rod upwards. The locking rod will then drive the push-pull rod to move upwards synchronously through the locking part, thereby bringing the locking pressure plate at the bottom of the locking rod closer to the clamping part, and finally firmly clamping the saw blade in the locking space, completing the saw blade removal process. During installation, since the release groove and locking groove are interconnected, when the user encounters a circular opening on the saw blade, the user first needs to drive the locking rod to rotate relative to the push-pull rod. The locking part on the locking rod will then enter the release groove from the locking groove. At this point, the locking rod can separate from the push-pull rod along the release groove, allowing it to be removed from the output shaft. Then, the circular-opening saw blade is placed on the locking rod, and after the saw blade contacts the locking pressure plate at the bottom of the locking rod, the user aligns the locking part on the locking rod with the release groove. Then, the user pushes the locking rod upwards along the output shaft, allowing the locking part to move upwards along the release groove. When the locking part reaches the top of the release groove, the user then controls the locking rod to rotate.The locking part on the locking rod rotates synchronously, eventually engaging with the push-pull rod in the locking groove. The user then turns the trigger to reset, compressing the return spring and pushing the push-pull rod and locking rod upwards simultaneously. When the locking rod reaches a certain position, the locking pressure plate reaches below the clamping part, firmly locking the saw blade within the locking space. The user can easily disassemble and connect the locking rod and push-pull rod by simply turning the locking rod. This convenient and quick disassembly and installation method allows users to choose whether to remove the locking rod based on their actual saw blade installation needs, enhancing its practicality. Compared to traditional multi-functional swing saw blades, which mostly use pressure plates and hexagonal screws for assembly, this invention allows for faster and more efficient saw blade installation simply by turning the trigger. It is simple to operate, saving time and effort. Furthermore, compared to subsequent improvements made by industry technicians, it utilizes a spring collet and... The traditional method of mounting and dismounting the saw blade involves a locking block, but the spring collet has a complex structure and requires complex heat bending to ensure its elasticity, thus increasing manufacturing costs. Furthermore, this method of clamping the saw blade using the spring collet and locking block is unreliable, as the saw blade is prone to loosening during operation. In contrast, the push-pull rod and locking rod of this invention do not require heat treatment, reducing manufacturing costs. When the saw blade is mounted on the output shaft's clamping part, the locking part on the locking rod remains locked within the locking groove and to the bottom of the push-pull rod by the return spring, preventing the locking rod from moving or rotating relative to the push-pull rod. This also prevents the locking plate at the bottom of the locking rod from moving or rotating, allowing the locking plate to firmly clamp the saw blade and prevent loosening during operation. Attached Figure Description

[0014] Figure 1 This is a perspective view of the present invention.

[0015] Figure 2 This is a cross-sectional view of the present invention.

[0016] Figure 3 This is an exploded view of the head shell and trigger of this utility model.

[0017] Figure 4 This is an exploded view of the trigger, eccentric block, and rotating rod of this utility model.

[0018] Figure 5 This is a perspective view of the trigger of this utility model.

[0019] Figure 6 This is an exploded view of the head shell, output shaft, and drive mechanism of this utility model.

[0020] Figure 7 This is a cross-sectional view of the head shell of this utility model.

[0021] Figure 8 This is an exploded view of the shift fork and drive motor of this utility model.

[0022] Figure 9 This is a schematic diagram of the drive motor of this utility model.

[0023] Figure 10 This is an exploded view of the output shaft, push-pull rod, and locking component of this utility model.

[0024] Figure 11 This is a structural schematic diagram of the push-pull rod, locking component, and return spring of this utility model.

[0025] Figure 12 This utility model comprises a push-pull rod, a locking component, and a return spring in three dimensions. Figure 1 .

[0026] Figure 13 This utility model comprises a push-pull rod, a locking component, and a return spring in three dimensions. Figure 2 .

[0027] Figure 14 This is an exploded view of the push-pull rod and locking component of this utility model.

[0028] Figure 15 This is an exploded view of the push-pull rod and the limiting ring of this utility model.

[0029] Figure 16 This is a perspective view of the push-pull rod of this utility model.

[0030] Figure 17 This is an exploded view of the locking rod and locking part of this utility model.

[0031] Figure 18 This is a cross-sectional view of the output shaft of this utility model.

[0032] Figure 19 This is a reference diagram showing the state of the trigger of this utility model after it has been rotated.

[0033] Figure 20 This is a schematic diagram of the structure of the trigger of this utility model after it is rotated.

[0034] Figure 21 This is a cross-sectional view of the trigger of this utility model after it has been rotated.

[0035] Figure 22 This is a schematic diagram of the structure of the trigger and the abutting part of this utility model.

[0036] Figure 23 This is a schematic diagram of the head shell and push-pull rod of this utility model.

[0037] The labels in the diagram represent the following meanings: 1-Head housing; 2-Trigger; 3-Output shaft; 4-Locking space; 5-Clamping part; 6-Locking rod; 7-Locking pressure plate; 8-Push-pull rod; 9-Eccentric block; 10-Mounting groove; 11-Disassembly / assembly channel; 12-Locking part; 13-Locking channel; 14-Disengagement channel; 15-Limiting groove; 16-Return spring; 17-Left disassembly / assembly channel; 18-Right disassembly / assembly channel; 19-Mounting hole; 21-Rotation groove; 27-Limiting ring;

[0038] 28-Limiting stage; 29-Through hole; 30-Bearing mounting slot; 31-Bearing; 38-Rotating rod;

[0039] 39-Rotating hole; 40-Fixing groove; 41-Connecting part; 42-Connecting groove; 43-Shift fork;

[0040] 44-Drive motor; 45-Eccentric rod; 46-Motor shaft; 47-Drive wheel; 48-Opening. Detailed Implementation

[0041] The present invention will be further described below with reference to specific embodiments:

[0042] This utility model belongs to the field of power tool technology, specifically referring to a quick-change structure for a swing saw blade. It includes a head housing 1, an output shaft 3 disposed within the head housing 1, and a locking member movably disposed within the output shaft 3. The bottom end of the output shaft 3 protrudes outside the head housing 1 and has a clamping portion 5. The locking pressure plate 7 at the bottom end of the locking member is located below the clamping portion 5, and a locking space 4 for installing the saw blade is formed between the locking pressure plate 7 and the clamping portion 5, allowing the saw blade to be smoothly installed between the locking pressure plate 7 and the clamping portion 5. When the user drives the locking member downwards, the locking pressure plate 7 at the bottom end of the locking member moves away from the clamping portion 5, allowing the saw blade to be easily removed from the locking space 4. When the user places a new saw blade into the locking space 4, the user drives the locking member upwards... After the movement, the locking plate 7 at the bottom of the locking component will move upward synchronously, so that the locking plate 7 is close to the clamping part 5. At this time, the saw blade is locked in the locking space 4 under the cooperation of the locking plate 7 and the clamping part 5, thus completing the installation of the saw blade. The locking component consists of a push-pull rod 8 and a locking rod 6, and both the push-pull rod 8 and the locking rod 6 are set in the output shaft 3. The locking plate 7 is set on the bottom end of the locking rod 6. The disassembly and assembly groove 11 on the push-pull rod 8 consists of a disengagement groove 14 and a locking groove 13. The locking rod 6 has a locking part 12. When the locking part 12 is set in the locking groove 13, the locking rod 6 and the push-pull rod 8 are locked. Since the trigger 2 is rotated on the head shell 1, and the eccentric block 9 on the trigger 2 and the top of the push-pull rod 8 are locked, the saw blade is locked in the locking space 4. The ends abut against each other, so when the user drives the trigger 2 to rotate, the trigger 2 will drive the eccentric block 9 to rotate synchronously. The eccentric block 9 will push the push-pull rod 8 to move downward, and the push-pull rod 8 will drive the locking rod 6 to move downward synchronously. At this time, the locking pressure plate 7 at the bottom of the locking rod 6 will move away from the clamping part 5, so that the saw blade located in the locking space 4 can be removed. This type of saw blade is a common type of cutting saw blade on the market. The opening 48 on the saw blade is "U" shaped. Since there is a return spring 16 in the output shaft 3 for driving the push-pull rod 8 to move upward, when the locking rod 6 and the push-pull rod 8 move downward, the return spring 16 will enter the compressed state. When the user places this type of saw blade into the locking space 4, and the user drives the trigger 2 to reset, the compressed return spring... Step 16 will push the locking rod 6 upward, and the locking rod 6 will drive the push-pull rod 8 to move upward synchronously through the locking part 12, so that the locking pressure plate 7 at the bottom of the locking rod 6 approaches the clamping part 5, and finally firmly clamps the saw blade in the locking space 4, completing the installation of the saw blade. Since the release channel 14 and the locking channel 13 are interconnected, when the user encounters a circular opening 48 on the saw blade, the user needs to first drive the locking rod 6 to rotate relative to the push-pull rod 8. Then the locking part 12 on the locking rod 6 will enter the release channel 14 from the locking channel 13. At this time, the locking rod 6 can separate from the push-pull rod 8 along the release channel 14, so that the locking rod 6 can be taken out from the output shaft 3. Then, the saw blade with a circular opening 48 can be fitted onto the locking rod 6.After the saw blade contacts the locking plate 7 at the bottom of the locking rod 6, the user aligns the locking part 12 on the locking rod 6 with the disengagement channel 14. Then, the user pushes the locking rod 6 upwards along the output shaft 3, allowing the locking part 12 to move upwards along the disengagement channel 14. When the locking part 12 reaches the top of the disengagement channel 14, the user controls the locking rod 6 to rotate, causing the locking part 12 to rotate synchronously. Finally, the locking part 12 enters the locking channel 13 and locks with the push-pull rod 8. At this point, the user turns the trigger 2 to reset, compressing the reset spring. Spring 16 will push the push-pull rod 8 and locking rod 6 upwards simultaneously. When the locking rod 6 moves to a certain position, the locking pressure plate 7 will reach below the clamping part 5, thus firmly locking the saw blade located in the locking space 4. The user can easily disassemble and connect the locking rod 6 and the push-pull rod 8 by simply rotating the locking rod 6. This disassembly and installation method is convenient and quick, allowing the user to choose whether to remove the locking rod 6 according to their actual needs for installing the saw blade. It is more practical, and compared to traditional multi-functional swing shovels where most saw blades are assembled using pressure plates and hexagonal screws, this method is more effective. This invention allows for quick and easy installation of the saw blade simply by rotating trigger 2, making it simple, time-saving, and labor-saving. Compared to subsequent improvements made by industry technicians, which use a spring collet and locking block to load and unload the saw blade, the spring collet has a complex structure and requires complex heat bending to ensure its elasticity, thus increasing manufacturing costs. Furthermore, this method of clamping the saw blade using the spring collet and locking block is unreliable; the saw blade is prone to loosening during operation. In contrast, this invention's push-pull rod 8 and locking block... Rod 6 does not require heat treatment, reducing the manufacturing cost of the oscillating shovel. When the saw blade is installed on the clamping part 5 of the output shaft 3, the locking part 12 on the locking rod 6 remains locked within the locking groove 13 and to the bottom end of the push-pull rod 8 due to the push of the return spring 16. This prevents the locking rod 6 from moving or rotating relative to the push-pull rod 8, thus ensuring that the locking pressure plate 7 at the bottom of the locking rod 6 also cannot move or rotate. This allows the locking pressure plate 7 to work with the clamping part 5 to firmly clamp the saw blade, preventing the saw blade from loosening during operation.

[0043] Preferably, the inner wall of the locking channel 13 is recessed to form a limiting groove 15, and the locking part 12 can be located within the limiting groove 15. Since the locking part 12 on the locking rod 6 is located within the limiting groove 15 on the inner wall of the locking channel 13, when the push rod 37 moves downward, the locking part will move downward synchronously with the push rod 37 due to its own weight, so that the locking part 12 is always located within the limiting groove 15 and locked with the push rod 8. The setting of the limiting groove 15 can better lock the locking part 12 within the limiting groove 15. When the locking part 12 is located in the limiting groove 15, the locking rod 6 cannot rotate relative to the push-pull rod 8, thus ensuring that the locking rod 6 cannot disengage from the push-pull rod 8 during the operation of the swing shovel. When the user wants to separate the locking rod 6 from the push-pull rod 8, the user needs to manually push the locking rod 6 upward a small distance to make the locking part 12 disengage from the limiting groove 15. At this time, the user can smoothly rotate the locking rod 6 to complete the separation of the locking rod 6 from the push-pull rod 8.

[0044] Preferably, the bottom end of the push-pull rod 8 is provided with a mounting groove 10. There are two disassembly / reassembly channels 11: a left disassembly / reassembly channel 17 and a right disassembly / reassembly channel 18. Both the left and right disassembly / reassembly channels 17 and 18 are located on the inner wall of the mounting groove 10. Each channel includes a disengagement channel 14 and a locking channel 13, which form an "L" shape when connected. The top end of the locking rod 6 is located within the mounting groove 10, and a mounting hole 19 is provided at the top end of the locking rod 6. The locking part 12 is a locking shaft, which is fixedly installed within the mounting hole 19, with both ends of the locking shaft protruding from the mounting hole 19 and located within the locking channel 13. Because the disassembly / reassembly channels 11... There are two mounting slots, a left mounting slot 17 and a right mounting slot 18, both of which are located on the inner wall of the mounting slot 10. The top of the locking rod 6 is located inside the mounting slot 10, and the locking part 12 is a locking shaft. The locking shaft is fixedly installed in the mounting hole 19 at the top of the locking rod 6, so that both ends of the locking shaft can enter the left mounting slot 17 and the right mounting slot 18 respectively. Both the left mounting slot 17 and the right mounting slot 18 include a disengagement slot 14 and a locking slot 13. So that when the saw blade is clamped, both ends of the locking rod 6 are located in the two locking slots 13 respectively. At this time, the locking between the locking rod 6 and the push-pull rod 8 is more stable, ensuring that the locking rod 6 cannot rotate relative to the push-pull rod 8.

[0045] Preferably, the inner wall of the output shaft 3 is provided with a mounting platform 25. The two ends of the return spring 16 abut against the mounting platform 25 and the bottom end of the push-pull rod 8, respectively. A limiting groove 26 is formed in the inner wall of the output shaft 3. A limiting ring 27 is provided in the limiting groove 26. A limiting platform 28 is provided on the push-pull rod 8. The limiting platform 28 can abut against the limiting ring 27. The bottom end of the return spring 16 abuts against the mounting platform 25 on the inner wall of the output shaft 3, so that the return spring 16 can be installed in the output shaft 3, which can prevent the return spring 16 from detaching from the output shaft 3. The setting of the limiting groove 26 allows the limiting ring 27 to be fixedly installed on the inner wall of the output shaft 3. The abutment platform 35 on the push-pull rod 8 abuts against the limiting ring 27, which can effectively prevent the return spring 16 from directly pushing the push-pull rod 8 out of the output shaft 3, so that the quick replacement of the saw blade can be carried out smoothly.

[0046] Preferably, the head shell 1 has a through hole 29, the output shaft 3 is disposed in the through hole 29, the inner wall of the through hole 29 has a bearing mounting groove 30, the bearing mounting groove 30 has a bearing 31 disposed in the bearing mounting groove 30, and the bearing 31 is sleeved on the output shaft 3; since the output shaft 3 in the head shell 1 needs to reciprocate at a certain angle when the swing shovel is working, and the bearing 31 is installed in the bearing mounting groove 30 in the head shell 1 and is sleeved on the output shaft 3, the output shaft 3 can be prevented from directly contacting the inner wall of the through hole 29 in the head shell 1, thereby reducing the friction between the output shaft 3 and the head shell 1 during the operation, reducing the wear of the output shaft 3, and increasing the service life of the output shaft 3.

[0047] Preferably, the top of the head shell 1 has a rotating groove 21, one end of the trigger 2 is rotatably disposed in the rotating groove 21, the rotating groove 21 has a rotating rod 38 disposed in the rotating groove 21, the trigger 2 has a rotating hole 39, the rotating rod 38 is disposed in the rotating hole 39, the eccentric block 9 is sleeved on the rotating rod 38, one end of the trigger 2 has a fixing groove 40, the eccentric block 9 is located in the fixing groove 40, the fixing groove 40 has a connecting part 41, the eccentric block 9 has a connecting groove 42, the connecting part 41 is provided in the fixing groove 40, and the eccentric block 9 has a connecting groove 42. Part 41 is set in the linkage groove 42 and abuts against the eccentric block 9; the trigger 2 is set in the rotation groove 21 through the rotating rod 38 and the rotating hole 39 and is rotatably connected to the head shell 1. The eccentric block 9 is also sleeved on the rotating rod 38. The eccentric block 9 is located in the fixing groove 40 at one end of the trigger 2, and the linkage part 41 in the fixing groove 40 is located in the linkage groove 42 of the eccentric block 9. So when the trigger 2 rotates, it can smoothly drive the eccentric block to rotate synchronously, so that the user can change the saw blade normally by rotating the trigger 2.

[0048] Preferably, the head shell 1 is further provided with a drive mechanism for driving the output shaft 3 to rotate. The drive mechanism includes a shift fork 43 and a drive motor 44. The shift fork 43 is sleeved on the output shaft 3 and fixedly connected to it. The drive motor 44 is provided with a motor shaft 46, and an eccentric rod 45 is eccentrically provided on the motor shaft 46. A drive wheel 47 is provided on the eccentric rod 45. The shift fork 43 is provided with an opening 48, and the drive wheel 47 is located in the opening 48 and abuts against the shift fork 43. The drive mechanism is a common structure in swing shovels on the market. It consists of a shift fork 43 and a drive motor 44. The shift fork 43 is sleeved on the output shaft 3 and fixedly connected to it. An eccentric rod 45 is eccentrically mounted on the motor shaft 46 of the motor 44. The drive wheel 47 on the eccentric rod 45 is located inside the opening 48 of the shift fork 43 and abuts against the shift fork 43. When the drive motor 44 starts working, the motor shaft 46 on the drive motor 44 will rotate, and the eccentric rod 45 on the motor shaft 46 will rotate eccentrically, so that the drive wheel 47 on the eccentric rod 45 will rotate eccentrically in sync. At this time, the drive wheel 47 will drive the shift fork 43 to swing left and right, and the shift fork 43 will drive the output shaft 3 to rotate left and right reciprocatingly, so that the saw blade located between the locking pressure plate 7 and the clamping part 5 will swing left and right reciprocatingly, so that the swing shovel can be used normally.

[0049] The above embodiments are merely preferred embodiments of the present utility model and are not intended to limit the scope of protection of the present utility model. Therefore, all equivalent changes made to the structure, shape, and principle of the present utility model should be covered within the scope of protection of the present utility model.

Claims

1. A quick-change structure for a oscillating saw blade, comprising a head housing (1), an output shaft (3) disposed within the head housing (1), and a locking member movably disposed within the output shaft (3), characterized in that: The bottom end of the output shaft (3) protrudes outside the head shell (1) and is provided with a clamping part (5). The bottom end of the locking member is provided with a locking pressure plate (7). The locking pressure plate (7) is located below the clamping part (5). A locking space (4) for installing the saw blade is formed between the locking pressure plate (7) and the clamping part (5). Driving the locking member to move can move the locking pressure plate (7) away from or closer to the clamping part (5), thereby completing the disassembly and installation of the saw blade. The locking component includes a push-pull rod (8) and a locking rod (6) disposed within the output shaft (3). The locking pressure plate (7) is disposed on the bottom end of the locking rod (6). The push-pull rod (8) has a disassembly and assembly groove (11), which includes a disengagement groove (14) and a locking groove (13) that are interconnected. The locking rod (6) has a locking part (12), which can be disposed within the locking groove. (13) After the locking rod (6) is driven to rotate relative to the push-pull rod (8), the locking part (12) can enter the disengagement groove (14) from the locking groove (13). At this time, the locking rod (6) can be separated from the push-pull rod (8). The head shell (1) is provided with a trigger (2), and the trigger (2) is provided with an eccentric block (9). The eccentric block (9) abuts against the top of the push-pull rod (8). The driving of the trigger (2) to rotate can drive the push-pull rod (8) to move downward through the eccentric block (9). At this time, the push-pull rod (8) drives the locking rod (6) to move downward, thereby making the locking pressure plate (7) away from the clamping part (5). The output shaft (3) is also provided with a return spring (16) for driving the push-pull rod (8) to move upward. The upward movement of the push-pull rod (8) can control the locking rod (6) to move upward, thereby making the locking pressure plate (7) close to the clamping part (5).

2. The quick-change structure for a oscillating saw blade according to claim 1, characterized in that: The inner wall of the locking channel (13) is recessed to form a limiting groove (15), and the locking part (12) can be located in the limiting groove (15).

3. The quick-change structure for a oscillating saw blade according to claim 1, characterized in that: The bottom end of the push-pull rod (8) is provided with an installation groove (10). There are two disassembly and assembly channels (11), namely a left disassembly and assembly channel (17) and a right disassembly and assembly channel (18). The left disassembly and assembly channel (17) and the right disassembly and assembly channel (18) are both opened on the inner wall of the installation groove (10). The left disassembly and assembly channel (17) and the right disassembly and assembly channel (18) both include a release channel (14) and a locking channel (13). The release channel (14) and the locking channel (13) are connected to form an "L" shape. The top end of the locking rod (6) is located in the installation groove (10). The top end of the locking rod (6) is provided with an installation hole (19). The locking part (12) is a locking shaft. The locking shaft is fixedly installed in the installation hole (19), and the two ends of the locking shaft are exposed in the installation hole (19) and located in the locking channel (13).

4. A quick-change structure for a oscillating saw blade according to any one of claims 1-3, characterized in that: The inner wall of the output shaft (3) is provided with a mounting platform (25). The two ends of the return spring (16) abut against the mounting platform (25) and the bottom end of the push-pull rod (8) respectively. The inner wall of the output shaft (3) is provided with a limiting groove (26). A limiting ring (27) is provided in the limiting groove (26). A limiting platform (28) is provided on the push-pull rod (8). The limiting platform (28) can abut against the limiting ring (27).

5. A quick-change structure for a oscillating saw blade according to any one of claims 1-3, characterized in that: The head shell (1) has a through hole (29), the output shaft (3) is disposed in the through hole (29), the inner wall of the through hole (29) has a bearing mounting groove (30), the bearing mounting groove (30) has a bearing (31) disposed in the bearing mounting groove (30), and the bearing (31) is sleeved on the output shaft (3).

6. A quick-change structure for a oscillating saw blade according to any one of claims 1-3, characterized in that: The top of the head shell (1) is provided with a rotating groove (21). One end of the trigger (2) is rotatably disposed in the rotating groove (21). A rotating rod (38) is provided in the rotating groove (21). A rotating hole (39) is provided on the trigger (2). The rotating rod (38) is disposed in the rotating hole (39). The eccentric block (9) is sleeved on the rotating rod (38). A fixing groove (40) is provided at one end of the trigger (2). The eccentric block (9) is located in the fixing groove (40). A connecting part (41) is provided in the fixing groove (40). A connecting groove (42) is provided on the eccentric block (9). The connecting part (41) is disposed in the connecting groove (42) and abuts against the eccentric block (9).

7. A quick-change structure for a oscillating saw blade according to any one of claims 1-3, characterized in that: The head shell (1) is also provided with a drive mechanism for driving the output shaft (3) to rotate. The drive mechanism includes a shift fork (43) and a drive motor (44). The shift fork (43) is sleeved on the output shaft (3) and fixedly connected to the output shaft (3). The drive motor (44) is provided with a motor shaft (46). An eccentric rod (45) is eccentrically provided on the motor shaft (46). A drive wheel (47) is provided on the eccentric rod (45). An opening (48) is provided on the shift fork (43). The drive wheel (47) is located in the opening (48) and abuts against the shift fork (43).

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