Angle grinder with high safety performance

Abstract

The utility model relates to the technical field of angle grinders, and discloses an angle grinder with high safety performance, which comprises a grinder body, a rotating shaft is arranged at the output end of the grinder body, a shaft sleeve and a mounting block are fixedly arranged at the head position of the grinder body, and the shaft sleeve sleeves the rotating shaft and is rotatably connected with the rotating shaft; the shaft sleeve is fixedly provided with a fixed retainer and is rotationally connected with a movable retainer, and the movable retainer rotationally sleeves the outer circumference of the fixed retainer; a fixing sleeve is fixedly arranged in the mounting block, and a driving shaft coaxially penetrates through the fixing sleeve; the driving shaft and the fixing sleeve are in sliding fit and rotating connection; an adjusting assembly is assembled between the driving shaft and the movable retainer, the adjusting assembly is in transmission connection with the movable retainer, and the driving shaft is in transmission fit with the adjusting assembly through a self-locking transmission assembly. After the position of the movable retainer is adjusted through the adjusting mechanism in a complex construction environment, the position of the movable retainer can be kept unchanged through the self-locking function of the self-locking transmission assembly, users are protected all the time, safety is improved, and the risk of hurting people and accidents is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of angle grinders, in particular to an angle grinder with high safety performance. Background Art

[0002] Electric angle grinders use high-speed rotating thin-blade grinding wheels, rubber grinding wheels, wire wheels, etc. to grind, cut, remove rust, and polish metal components. Angle grinders are suitable for cutting, grinding, and brushing metal and stone. Water cannot be used during operation.

[0003] The publication number is: CN218697225U. The angle grinder with high protection performance comprises an angle grinder body and a sub-handle. A drive shell is fixedly connected to the left side of the angle grinder body, a handle is fixedly connected to the right side of the angle grinder body, a protective cover is fixedly connected to the right side of the lower end face of the drive shell, an angle grinder shaft is movably connected to the middle part of the lower end face of the drive shell, a bearing is fixedly connected to the middle part of the outer wall of the angle grinder shaft, a protective cover is fixedly connected to the outer ring of the bearing, a grinding wheel is fixedly connected to the end of the angle grinder shaft, the sub-handle is arranged at the lower part of the front end face of the drive shell, a rotation adjustment device is arranged on the left side of the upper end face of the angle grinder body, and a blocking plate is movably connected to the left side of the rotation adjustment device.

[0004] Based on the above technical features, the problem that arises is: in the prior art, the movable protective cover is fixed on the bearing, and the bearing sleeve is arranged on the rotating shaft of the angle grinder. Since the bearing has no self-locking function and the operating conditions of the angle grinder are complicated, the protective cover can easily rotate due to the action of external force, thereby causing deviation from the originally set protection position, greatly reducing the protection performance and safety, and easily causing accidents.

[0005] Therefore, it is necessary to solve the above problems by an angle grinder with high safety performance. Summary of the invention

[0006] The purpose of the utility model is to provide an angle grinder with high safety performance to solve the problems raised in the above background technology.

[0007] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: an angle grinder with high safety performance, comprising a fuselage, the output end of the fuselage is a rotating shaft, a shaft sleeve is fixedly arranged at the head position of the fuselage, the shaft sleeve is sleeved on the rotating shaft and is rotatably connected to the rotating shaft; the shaft sleeve is both fixedly arranged with a fixed guard ring and rotatably connected to a dynamic guard ring, the dynamic guard ring is rotatably sleeved on the outer circumference of the fixed guard ring; a mounting block is fixedly arranged at the head position of the fuselage, a fixed sleeve is fixedly arranged in the mounting block, a driving shaft coaxially passes through the fixed sleeve; the driving shaft and the fixed sleeve are both slidably matched and rotatably connected; an adjusting component is assembled between the driving shaft and the dynamic guard ring, the adjusting component is transmission-connected to the dynamic guard ring, and the driving shaft and the adjusting component are transmission-matched through a self-locking transmission component.

[0008] Preferably, the adjustment assembly includes a transmission shaft, a gear and an end gear, the transmission shaft is rotatably connected to the mounting block and is in transmission cooperation with the self-locking transmission assembly; the gear is fixedly sleeved on the transmission shaft; the end gear is rotatably sleeved on the shaft sleeve and is fixedly connected to the dynamic guard ring; the gear is meshingly cooperated with the end gear.

[0009] Preferably, an installation cavity is opened in the installation block, and the self-locking transmission assembly is installed in the installation cavity; the self-locking transmission assembly includes a worm and a worm wheel; the worm is both rotationally connected to the installation block and transmission-connected to the drive shaft; the worm wheel is fixedly sleeved on the transmission shaft, and the worm wheel is meshingly matched with the worm.

[0010] Preferably, the end of the drive shaft close to the worm is coaxially fixedly connected to a transmission ring, and a plurality of teeth are fixedly arranged on the end plane of the transmission ring close to the worm; a plurality of teeth are also fixed on the end plane of the worm close to the transmission ring; the plurality of teeth on the end plane of the transmission ring close to the worm serve as active teeth and are contact-type snap-fitted with the plurality of teeth on the end plane of the worm close to the transmission ring as driven teeth.

[0011] Preferably, the end of the worm gear away from the connected teeth is coaxially fixedly connected to a support shaft, and the support shaft is rotatably connected to the mounting block.

[0012] Preferably, a limiting ring is fixedly sleeved on the driving shaft, and a spring is installed between the limiting ring and the fixing sleeve; the spring sleeve is arranged on the driving shaft and is fixedly connected to the fixing sleeve at one end, and fixedly connected to the limiting ring at the other end; a plurality of teeth are fixedly arranged on the end plane of the fixing sleeve close to the transmission ring, and a plurality of teeth are also fixedly arranged on the end plane of the transmission ring close to the fixing sleeve, and the plurality of teeth on the fixing sleeve serve as limiting teeth and are engaged in a contact-limited manner with the plurality of teeth on the end plane of the transmission ring close to the fixing sleeve, which also serve as limiting teeth.

[0013] Preferably, a handle is fixedly sleeved on the end of the driving shaft away from the transmission ring, and the handle is located outside the mounting block; the limiting ring is located between the handle and the fixed sleeve.

[0014] Preferably, a fixing nut is threadedly connected to the rotating shaft, a grinding wheel is sleeved on the rotating shaft, and the grinding wheel is located between the fixing nut and the fixed retaining ring.

[0015] Technical effects and advantages of the utility model:

[0016] First, in the utility model, after the adjusting mechanism adjusts the position of the dynamic guard ring, the self-locking transmission assembly fixes the position of the dynamic guard ring through its own self-locking function. Even if the construction environment is complex, the dynamic guard ring can maintain its position during the work process and protect the user at all times, thereby improving safety and reducing the risk of injury and accidents.

[0017] Second, in the present invention, the drive shaft drives the teeth on the transmission ring to engage or disengage with the teeth on the worm. When in use, the drive shaft is pushed, and the drive shaft drives the transmission ring to move, and the teeth on the transmission ring engage with the teeth on the worm. Then, the drive shaft is twisted to rotate the worm. When the rotation is completed, the drive shaft is pulled to disengage the teeth, thereby preventing accidental collision and improving safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the three-dimensional structure of the utility model;

[0019] Figure 2 It is a partial cross-sectional schematic diagram of the utility model;

[0020] Figure 3 This is an enlarged schematic diagram of point A of the utility model;

[0021] Figure 4 It is a partial cutaway side view schematic diagram of the utility model;

[0022] Figure 5 It is a partial three-dimensional schematic diagram of the utility model;

[0023] Figure 6 It is an enlarged schematic diagram of point B of the present utility model.

[0024] In the figure: 1. body; 2. rotating shaft; 3. fixing nut; 4. grinding wheel; 5. fixed guard ring; 6. dynamic guard ring; 7. handle; 8. limit ring; 9. spring; 10. fixing sleeve; 11. driving shaft; 12. transmission ring; 13. teeth; 14. worm; 15. supporting shaft; 16. worm wheel; 17. transmission shaft; 18. gear; 19. end gear; 20. mounting block; 21. bushing. DETAILED DESCRIPTION

[0025] The following will clearly and completely describe the technical solutions in the embodiments of the utility model in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0026] The utility model provides an angle grinder with high safety performance, comprising a body 1. Figure 1 As shown, a mounting block 20 is welded and fixed at the head position on the left side of the fuselage 1, and a driving shaft 11 is inserted into the mounting block 20. The driving shaft 11 is located on the shaft body outside the mounting block 20 and a handle 7 is fixedly sleeved thereon for easy gripping. Figure 2 As shown, the mounting block 20 is fixedly connected to the fixing sleeve 10, and the drive shaft 11 coaxially passes through the fixing sleeve 10 and is both slidably matched and rotationally connected to the fixing sleeve 10. A limit ring 8 and a spring 9 are assembled between the handle 7 and the fixing sleeve 10. The limit ring 8 is fixedly sleeved on the drive shaft 11. The spring 9 is sleeved on the drive shaft 11 and one end is fixedly connected to the limit ring 8 and the other end is fixedly connected to the fixing sleeve 10, and is used for resetting the drive shaft 11.

[0027] The mounting block 20 has a mounting cavity dug out therein, in which a self-locking transmission assembly is mounted, and the self-locking transmission assembly is in transmission connection with the drive shaft 11. The self-locking transmission assembly includes a worm 14 and a worm wheel 16, and the worm 14 is in transmission connection with the drive shaft 11 coaxially, and is used to drive the worm 14 to rotate. The end of the worm 14 away from the drive shaft 11 is coaxially fixedly connected to the support shaft 15, and the support shaft 15 is in rotation connection with the mounting block 20. The worm wheel 16 is meshed with the worm 14.

[0028] like Figure 3 As shown, a transmission ring 12 is fixedly sleeved at the end of the drive shaft 11 close to the worm 14, and the transmission ring 12 is located between the fixed sleeve 10 and the worm 14. A plurality of teeth 13 for transmission are welded and fixed to the end plane of the transmission ring 12 close to the worm 14 and the end plane of the worm 14 close to the transmission ring 12. The plurality of teeth 13 on each end plane are evenly distributed in a circular array with the center of the end plane as the center. The plurality of teeth 13 on the end plane of the transmission ring 12 close to the worm 14 as active teeth correspond to the plurality of teeth 13 on the end plane of the worm 14 close to the transmission ring 12 as driven teeth, and the contact-type clamping transmission is matched, that is, when the teeth 13 on the end plane of the transmission ring 12 close to the worm 14 contact the teeth 13 on the worm 14, they are clamped and rotate synchronously.

[0029] A plurality of teeth 13 for limiting are welded on the end plane of the transmission ring 12 close to the fixed sleeve 10 and the end plane of the fixed sleeve 10 close to the transmission ring 12. The plurality of teeth 13 on each end plane are evenly distributed in a circular array with the center of the end plane as the center. The plurality of teeth 13 on the end plane of the transmission ring 12 close to the fixed sleeve 10 correspond to the plurality of teeth 13 on the end plane of the fixed sleeve 10 close to the transmission ring 12 and are engaged in a contact-type limiting engagement, that is, when the plurality of teeth 13 on the end plane of the transmission ring 12 close to the fixed sleeve 10 contact the plurality of teeth 13 on the end plane of the fixed sleeve 10 close to the transmission ring 12, an engagement is formed and limiting is completed, preventing movement when the handle 7 is held.

[0030] like Figure 4 As shown, the output head at the head position on the left side of the machine body 1 is a rotating shaft 2, and a fixing nut 3 is threadedly connected to the rotating shaft 2 and a grinding wheel 4 is sleeved thereon for fastening the grinding wheel 4. Figure 5 As shown, a shaft sleeve 21 is sleeved on the rotating shaft 2, and the shaft sleeve 21 is fixedly connected to the fuselage 1 and is also rotatably connected to the rotating shaft 2. A fixed retaining ring 5 is coaxially welded on the shaft sleeve 21, and the fixed retaining ring 5 is formed by a semi-disc cover and a semi-circular ring fixedly connected. The grinding wheel 4 is located in the fixed retaining ring 5, which is used to prevent splashing when the grinding wheel 4 is broken. The shaft sleeve 21 is rotatably connected to a dynamic retaining ring 6, which is sleeved on the outer circumference of the fixed retaining ring 5 and rotatably cooperates with the fixed retaining ring 5 to adjust the position of the dynamic retaining ring 6.

[0031] like Figure 6 As shown, an adjustment assembly is assembled between the dynamic retainer 6 and the drive shaft 11, and the adjustment assembly is transmission-connected to both the worm gear 16 and the dynamic retainer 6. The adjustment assembly includes a gear 18 and an end gear 19. The worm gear 16 is coaxially fixedly connected to a transmission shaft 17, the transmission shaft 17 passes through the mounting block 20 and is rotationally connected to the mounting block 20, and the end of the transmission shaft 17 away from the worm gear 16 is coaxially fixedly connected to the gear 18. The end gear 19 is coaxially fixedly connected to the dynamic retainer 6. The gear 18 meshes with the end gear 19 to drive the end gear 19 to rotate.

[0032] Working principle:

[0033] When the size of the opening between the dynamic retaining ring 6 and the fixed retaining ring 5 needs to be adjusted, the user holds the handle 7 and pushes it in the direction close to the mounting block 20. At this time, the handle 7 drives the drive shaft 11 to slide along the axial direction of the fixed sleeve 10 in the direction close to the worm 14, and the drive shaft 11 drives the transmission ring 12 and the limit ring 8 to move in the direction close to the worm 14, and the transmission ring 12 drives the teeth 13 on the end plane close to the worm 14 to gradually approach the worm 14. At the same time, the spring 9 is compressed, and the transmission ring 12 drives the teeth 13 on the end plane close to the fixed sleeve 10 to gradually disengage from the teeth 13 on the fixed sleeve 10. When the teeth 13 on the end plane of the transmission ring 12 close to the worm 14 are in contact with the end plane of the worm 14, the teeth 13 on the end plane of the transmission ring 12 close to the fixed sleeve 10 are completely disengaged from the teeth 13 on the fixed sleeve 10.

[0034] Then, the handle 7 is twisted, and the handle 7 drives the driving shaft 11 to rotate, and the driving shaft 11 drives the transmission ring 12 to rotate, and the transmission ring 12 drives the teeth 13 on the end plane near the worm 14 to rotate around the central axis of the worm 14, and the teeth 13 on the end plane of the transmission ring 12 close to the worm 14 contact with the teeth 13 on the worm 14 and form a clamping connection.

[0035] Then continue to twist the handle 7, the transmission ring 12 drives the worm 14 to rotate around its own axis through the teeth 13 on the end plane of the transmission ring 12 close to the worm 14 and the teeth 13 on the worm 14. At this time, the worm 14 drives the worm wheel 16 to rotate, the worm wheel 16 drives the transmission shaft 17 to rotate, the transmission shaft 17 drives the gear 18 to rotate, the gear 18 drives the end face gear 19 to rotate, and the end face gear 19 drives the dynamic retainer 6 to rotate, thereby adjusting the size of the opening between the dynamic retainer 6 and the fixed retainer 5.

[0036] When the adjustment is completed, release the handle 7, and under the action of the elastic force of the spring 9, the limit ring 8 moves away from the fixed sleeve 10. The limit ring 8 drives the drive shaft 11 to slide in the direction away from the worm 14, and the drive shaft 11 drives the handle 7 and the transmission ring 12 to move in the direction away from the worm 14. At this time, the transmission ring 12 drives the teeth 13 on the end plane close to the fixed sleeve 10 to gradually approach the teeth 13 on the fixed sleeve 10. At the same time, the spring 9 stretches, and the transmission ring 12 drives the teeth 13 on the end plane close to the worm 14 to gradually disengage from the teeth 13 on the worm 14. When the teeth 13 on the end plane of the transmission ring 12 close to the fixed sleeve 10 contacts the end plane of the fixed sleeve 10, the teeth 13 on the end plane of the transmission ring 12 close to the worm 14 are completely out of contact with the teeth 13 on the worm 14.

[0037] Then, the handle 7 is rotated again to make the teeth 13 on the end plane of the transmission ring 12 close to the fixing sleeve 10 contact with the teeth 13 on the fixing sleeve 10 and form a limit engagement. Thus, the whole adjustment process ends.

[0038] Since the cooperation between the worm 14 and the worm wheel 16 has a self-locking function, after the adjustment is completed, the position of the dynamic retaining ring 6 will not change even when used in a complex environment, thereby enhancing the protection and safety.

[0039] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An angle grinder with high safety performance, comprising a body (1), characterized in that: The output end of the body (1) is a rotating shaft (2). A shaft sleeve (21) is fixedly arranged at the head position of the body (1). The shaft sleeve (21) is sleeved on the rotating shaft (2) and is rotatably connected to the rotating shaft (2). The shaft sleeve (21) is both fixedly arranged with a fixed retaining ring (5) and rotatably connected with a moving retaining ring (6). The moving retaining ring (6) is rotatably sleeved on the outer circumference of the fixed retaining ring (5). A mounting block (20) is fixedly arranged at the head position of the body (1). A fixed sleeve (10) is fixedly arranged inside the mounting block (20). A driving shaft (11) coaxially passes through the fixed sleeve (10). The driving shaft (11) and the fixed sleeve (10) are both slidably matched and rotatably connected. An adjusting component is assembled between the driving shaft (11) and the moving retaining ring (6). The adjusting component is transmission-connected to the moving retaining ring (6). The driving shaft (11) and the adjusting component are transmission-matched via a self-locking transmission component.

2. An angle grinder with high safety performance according to claim 1, characterized in that: The adjustment assembly comprises a transmission shaft (17), a gear (18) and an end face gear (19); the transmission shaft (17) is rotatably connected to a mounting block (20) and is in transmission cooperation with a self-locking transmission assembly; the gear (18) is fixedly sleeved on the transmission shaft (17); the end face gear (19) is rotatably sleeved on a shaft sleeve (21) and is fixedly connected to a dynamic retaining ring (6); the gear (18) is meshingly cooperated with the end face gear (19).

3. The angle grinder with high safety performance according to claim 2, characterized in that: The mounting block (20) has a mounting cavity in which a self-locking transmission assembly is mounted. The self-locking transmission assembly comprises a worm (14) and a worm wheel (16). The worm (14) is both rotationally connected to the mounting block (20) and transmission-connected to the drive shaft (11). The worm wheel (16) is fixedly sleeved on the drive shaft (17), and the worm wheel (16) is meshed with the worm (14).

4. The angle grinder with high safety performance according to claim 3, characterized in that: The end of the drive shaft (11) close to the worm (14) is coaxially fixedly connected to the transmission ring (12); a plurality of teeth (13) are fixedly arranged on the plane of the end of the transmission ring (12) close to the worm (14); a plurality of teeth (13) are also fixed on the plane of the end of the worm (14) close to the transmission ring (12); the plurality of teeth (13) on the plane of the end of the transmission ring (12) close to the worm (14) serve as driving teeth and are contact-type snap-fitted with the plurality of teeth (13) on the plane of the end of the worm (14) close to the transmission ring (12) as driven teeth.

5. The angle grinder with high safety performance according to claim 3, characterized in that: The end of the worm (14) away from the connected tooth (13) is coaxially fixedly connected to a support shaft (15), and the support shaft (15) is rotatably connected to a mounting block (20).

6. The angle grinder with high safety performance according to claim 4, characterized in that: A limiting ring (8) is fixedly sleeved on the driving shaft (11), and a spring (9) is installed between the limiting ring (8) and the fixing sleeve (10); the spring (9) is sleeved on the driving shaft (11) and one end is fixedly connected to the fixing sleeve (10), and the other end is fixedly connected to the limiting ring (8); a plurality of teeth (13) are fixedly arranged on an end plane of the fixing sleeve (10) close to the transmission ring (12), and a plurality of teeth (13) are also fixedly arranged on an end plane of the transmission ring (12) close to the fixing sleeve (10); the plurality of teeth (13) on the fixing sleeve (10) serve as limiting teeth and are engaged in a contact-type limiting snap-fit ​​with a plurality of teeth (13) on an end plane of the transmission ring (12) close to the fixing sleeve (10) which also serve as limiting teeth.

7. The angle grinder with high safety performance according to claim 6, characterized in that: A handle (7) is fixedly sleeved on the end of the drive shaft (11) away from the transmission ring (12), and the handle (7) is located outside the mounting block (20); the limiting ring (8) is located between the handle (7) and the fixing sleeve (10).

8. The angle grinder with high safety performance according to claim 1, characterized in that: The rotating shaft (2) is threadedly connected to a fixing nut (3), a grinding wheel (4) is sleeved on the rotating shaft (2), and the grinding wheel (4) is located between the fixing nut (3) and a fixed retaining ring (5).

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