Eccentric electric grinding tool

Abstract

The utility model discloses an eccentric electric polishing tool which comprises a motor, a transmission assembly and a waterproof assembly, and a motor output shaft is arranged at one end of the motor. The transmission assembly comprises a connecting shaft and a transmission gear ring, one end of the connecting shaft sleeves a motor output shaft, and the other end of the connecting shaft is connected with an eccentric polishing head; the transmission gear ring is located between the motor output shaft and the connecting shaft, the transmission gear ring is in interference fit with the motor output shaft, and the transmission gear ring is in clearance fit with the connecting shaft; the waterproof assembly comprises a waterproof cover and a sealing piece, and the waterproof cover covers the motor; the sealing piece is arranged on the transmission assembly and used for restraining liquid from being transmitted to the output shaft of the motor through the transmission assembly. According to the utility model, the anti-seismic and waterproof performance of the electric polishing tool can be effectively enhanced.

Description

TECHNICAL FIELD

[0001] The utility model relates to polishing equipment technical field especially relates to a eccentric electric polishing tool. BACKGROUND

[0002] In the preparation process of the product, the surface of the product is often treated by polishing process, and the polishing process is mechanical grinding of the surface of the product by eccentric polishing head fixed with sand particles such as grinding wheel and sandpaper, so as to achieve the purposes of removing burrs on the surface of the product, surface rust treatment and surface polishing. In the process of polishing the product by the eccentric polishing head, various vibrations will inevitably occur, which will easily cause the collision of the internal parts of the motor when the vibration is transmitted to the motor shaft, thereby affecting the service life of the motor. In addition, in some special working conditions, underwater polishing work is required, which undoubtedly improves the waterproof performance requirement of the motor. SUMMARY

[0003] In order to overcome the above-mentioned shortcomings, the utility model discloses a eccentric electric polishing tool which can effectively enhance the anti-vibration and waterproof performance of the electric polishing tool.

[0004] In order to achieve the above purpose, one of the technical solutions adopted by the utility model is: a eccentric electric polishing tool, comprising

[0005] A motor, one end of the motor is provided with a motor output shaft;

[0006] A transmission assembly, comprising a connecting shaft and a transmission gear ring, one end of the connecting shaft is sleeved on the motor output shaft, and the other end is connected with an eccentric polishing head; the transmission gear ring is located between the motor output shaft and the connecting shaft, and the transmission gear ring is interference fit with the motor output shaft, and the transmission gear ring is clearance fit with the connecting shaft;

[0007] A waterproof assembly, comprising a waterproof cover and a sealing element, the waterproof cover is covered on the motor; the sealing element is arranged on the transmission assembly to inhibit the transmission of liquid to the motor output shaft through the transmission assembly.

[0008] The utility model has the advantages that:

[0009] The motor output shaft is indirectly connected with the eccentric polishing head through the transmission assembly, which not only ensures the transmission of the rotary motion of the motor output shaft to the eccentric polishing head, but also buffers the vibration in the polishing process of the eccentric polishing head by using the transmission assembly, so as to avoid the direct transmission of the vibration of the eccentric polishing head to the motor output shaft; and the waterproof performance of the motor is effectively improved by the waterproof assembly.

[0010] In the transmission assembly, the transmission gear ring is in interference fit with the motor output shaft to ensure the force synchronization of the transmission gear ring and the motor output shaft, so that the transmission gear ring and the motor output shaft rotate at the same frequency; then through the clearance fit between the transmission gear ring and the connecting shaft, both the transmission of rotary motion and the release of the vibration transmitted to the connecting shaft by the eccentric polishing head are ensured, so as to avoid the vibration being transmitted to the motor output shaft through the transmission gear ring and improve the service life of the motor.

[0011] In the waterproof assembly, the waterproof cover can waterproof the surface of the motor, and the sealing element can effectively prevent liquid leakage at the connection between the transmission assembly and the motor output shaft, so as to avoid the liquid contacted by the eccentric polishing head being transmitted to the motor output shaft through the transmission assembly, thereby improving the waterproof performance of the motor and the motor output shaft and prolonging the service life of the motor.

[0012] Further, the transmission gear ring comprises a gear ring body, and a plurality of transmission gears are arranged in a circumferential array on the surface of the gear ring body; the end of the connecting shaft facing the motor output shaft is provided with a connecting groove, and a plurality of transmission grooves corresponding to the transmission gears are arranged in the connecting groove; the transmission gears are located in the corresponding transmission grooves and have a gap with the transmission grooves. The stability of transmission is ensured by the cooperation of the transmission gears and the transmission grooves.

[0013] Further, the transmission gears and the corresponding transmission grooves have a gap in the radial direction and the circumferential direction of the transmission gear ring. Since the vibration of the eccentric polishing head is not directional, when the gap is reserved in the radial direction and the circumferential direction of the transmission gear ring, multi-directional buffering of the vibration can be achieved to quickly release the vibration.

[0014] Further, the connecting groove comprises a first ring groove and a second ring groove coaxially and in communication with each other, the radial dimension of the first ring groove is smaller than that of the second ring groove, so that a step surface is formed at the junction of the first ring groove and the second ring groove; and the radial dimension of the first ring groove is matched with the outer diameter of the gear ring body, and the radial dimension of the second ring groove is matched with the radial dimension of the circumference formed by the groove bottoms of the plurality of transmission grooves. The first ring groove and the second ring groove are arranged to match the gear ring body and the transmission gears, so as to improve the assembly stability of the connecting shaft and the transmission gear ring. The axial displacement of the transmission gears is limited by the step surface.

[0015] Further, when the transmission gears are located in the corresponding transmission grooves, a gap is reserved between the transmission gears and the step surface.

[0016] Furthermore, it also includes a protective sleeve fitted onto the transmission assembly; one end of the protective sleeve extends towards the motor and is fixed to the waterproof cover, while the other end extends towards the eccentric grinding head. The protective sleeve helps to prevent and protect against flying debris during the grinding process.

[0017] Furthermore, a first bearing is provided between the protective sleeve and the connecting shaft. One end of the first bearing abuts against the connecting shaft, and the other end is fixed by a first retaining spring. This ensures smooth rotation of the connecting shaft within the protective sleeve.

[0018] Furthermore, the sealing element includes a ring plate, a first sealing ring, and a second sealing ring. The ring plate is fitted onto the connecting shaft and located between the eccentric grinding head and the first bearing. One end of the ring plate abuts against the first bearing, and the other end is fixed by a second retaining ring. The inner ring surface of the ring plate is sealed against the connecting shaft by the first sealing ring, and the outer ring surface of the ring plate is sealed against the protective sleeve by the second sealing ring. The cooperation between the first bearing and the second retaining ring limits the position of the ring plate, and the cooperation between the ring plate, the first sealing ring, and the second sealing ring effectively inhibits the movement of water from the eccentric grinding head towards the motor via the connecting shaft or the protective sleeve.

[0019] Furthermore, the sealing element also includes a third sealing ring located between the waterproof cover and the protective sleeve to prevent water from seeping into the motor at the connection between the waterproof cover and the protective sleeve.

[0020] Furthermore, the waterproof cover is a cylindrical structure with one end open, and a power cord interface communicating with its interior is provided on the waterproof cover. Attached Figure Description

[0021] Figure 1 This is a three-dimensional structural diagram of the electric grinding tool according to an embodiment of the present utility model;

[0022] Figure 2 This is a cross-sectional schematic diagram of the electric grinding tool according to an embodiment of the present utility model;

[0023] Figure 3 This is a cross-sectional view of the motor and transmission assembly after assembly according to an embodiment of this utility model;

[0024] Figure 4 for Figure 3 A magnified view of part A in the middle;

[0025] Figure 5 This is a schematic diagram of the assembly of the connecting shaft and the transmission gear ring according to an embodiment of the present utility model;

[0026] Figure 6 This is a schematic diagram of the ring plate in an embodiment of the present invention.

[0027] In the drawings:

[0028] 1 - motor; 11 - motor output shaft;

[0029] 21 - connecting shaft; 211 - transmission groove; 212 - first ring groove; 213 - second ring groove; 22 - transmission gear ring; 221 - transmission teeth; 23 - protective sleeve; 24 - first bearing; 25 - first circlip; 26 - second circlip;

[0030] 3 - eccentric polishing head;

[0031] 41 - waterproof cover; 411 - power line interface; 42 - ring plate; 421 - ring plate step surface; 43 - first sealing ring; 44 - second sealing ring; 45 - third sealing ring. DETAILED DESCRIPTION

[0032] The advantages and features of the present application will be more apparent from the following detailed description of preferred embodiments of the present application, taken in conjunction with the accompanying drawings, in which:

[0033] EMBODIMENT

[0034] Referring to the drawings, the present application is an eccentric electric polishing tool, which comprises a motor 1, a transmission assembly, and a waterproof assembly. Figures 1-4 The motor 1 has a motor output shaft 11 at one end. The transmission assembly comprises a connecting shaft 21 and a transmission gear ring 22. The connecting shaft 21 is sleeved on the motor output shaft 11 at one end and connected with the eccentric polishing head 3 at the other end. The transmission gear ring 22 is located between the motor output shaft 11 and the connecting shaft 21. The transmission gear ring 22 is in interference fit with the motor output shaft 11 and in clearance fit with the connecting shaft 21. The waterproof assembly comprises a waterproof cover 41 and a sealing member. The waterproof cover 41 is arranged on the motor. The sealing member is arranged on the transmission assembly to prevent liquid from being transmitted to the motor output shaft 11 through the transmission assembly.

[0035] In use, the motor 1 is started. The motor output shaft 11 rotates and drives the transmission gear ring 22 to rotate synchronously. The transmission gear ring 22 then transmits the rotating motion to the connecting shaft 21, thereby driving the eccentric polishing head 3 to rotate for polishing. During the polishing process, the vibration of the eccentric polishing head 3 is directly transmitted to the connecting shaft 21. Due to the clearance fit between the connecting shaft 21 and the transmission gear ring 22, the vibration is effectively slowed down, thereby avoiding the problem of shortening the service life of the motor 1 caused by the direct transmission of the vibration to the motor output shaft 11.

[0036] In the prior art, the motor output shaft 11 is usually directly connected with the eccentric polishing head 3. When the eccentric polishing head 3 vibrates, the vibration is directly transmitted to the motor output shaft 11. In the present application, the motor output shaft 11 is indirectly connected with the eccentric polishing head 3 through the transmission assembly. The rotation of the motor output shaft 11 is transmitted to the eccentric polishing head 3, and the transmission assembly can buffer the vibration of the eccentric polishing head 3 during polishing. In the transmission assembly, the transmission gear ring 22 and the connecting shaft 21 are gap-fitted, which can further buffer the vibration, thereby avoiding the vibration being transmitted to the motor output shaft 11 through the transmission gear ring 22, and improving the service life of the motor 1.

[0037] When the eccentric polishing head 3 operates underwater, the waterproof cover 41 can protect the surface of the motor 1, and the sealing element can prevent liquid from leaking at the connection between the transmission assembly and the motor output shaft 11, thereby avoiding the liquid contacted by the eccentric polishing head 3 from being transmitted to the motor output shaft 11 through the transmission assembly, and improving the waterproof performance and service life of the motor 1.

[0038] In some embodiments, referring to FIG. 2, the transmission gear ring 22 includes a gear ring body, and a plurality of transmission gears 221 are arranged in a circumferential array on the surface of one end of the gear ring body facing the motor 1. The connecting shaft 21 is provided with a connecting groove on the end facing the motor output shaft 11, and a plurality of transmission grooves 211 corresponding to the transmission gears 221 are arranged in the connecting groove. Figures 4-5 The transmission gears 221 are located in the corresponding transmission grooves 211 and have a gap with the corresponding transmission grooves 211. The stability of the rotation transmission is ensured by the cooperation of the plurality of transmission gears 221 and the transmission grooves 211.

[0039] Further, the transmission gears 221 and the corresponding transmission grooves 211 have a gap in the radial direction and the circumferential direction of the transmission gear ring 22. Since the vibration of the eccentric polishing head 3 is not directional, the multi-directional buffering of the vibration can be achieved when the gap is reserved in the radial direction and the circumferential direction of the transmission gear ring 22, so as to achieve the purpose of quickly releasing the vibration. Specifically, in the radial direction of the transmission gear ring 22, a first gap is reserved between the transmission gears 221 and the groove bottoms of the corresponding transmission grooves 211. In the circumferential direction of the transmission gear ring 22, a second gap is reserved between the two sides of the transmission gears 221 and the two groove walls of the corresponding transmission grooves 211. Further, the first gap is 0.15-0.3 mm, and the second gap is 0.1-0.15 mm. Exemplarily, the first gap is 0.2 mm, and the second gap is 0.1 mm.

[0040] In some embodiments, the size of the transmission gear 211 in the circumferential direction of the transmission gear ring 22 gradually decreases from the side close to the gear ring body to the side away from the gear ring body.

[0041] In order to ensure the synchronization of the transmission gear ring 22 rotating with the motor output shaft 11, in some embodiments, the cross section of the motor output shaft 11 is in an oval track structure, and the inner ring surface shape of the gear ring body is adapted to the oval track structure.

[0042] In some embodiments, referring to the accompanying drawings, Figure 4 As shown, the connecting groove comprises coaxial and interconnected first ring groove 212 and second ring groove 213, the radial dimension of the first ring groove 212 is smaller than that of the second ring groove 213, so that a step surface is formed at the junction of the first ring groove 212 and the second ring groove 213; and the radial dimension of the first ring groove 212 is adapted to the outer diameter of the gear ring body, and the radial dimension of the second ring groove 213 is adapted to the radial dimension of the circumference formed by the groove bottom of the plurality of transmission grooves 211. The first ring groove 212 and the second ring groove 213 are arranged so that the connecting groove can be adapted to the gear ring body and the transmission gear 221, thereby improving the assembly stability of the connecting shaft 21 and the transmission gear ring 22. Further, the axial displacement of the transmission gear 221 can be limited by the step surface. Furthermore, when the transmission gear 221 is located in the corresponding transmission groove 211, a gap is left between the transmission gear 221 and the step surface.

[0043] In some embodiments, referring to the accompanying drawings, Figures 1-2 As shown, the connecting shaft 21 is further sleeved with a protective sleeve 23, one end of the protective sleeve 23 extends towards the motor 1 and is fixedly connected to the waterproof cover 41 by bolts, and the other end of the protective sleeve 23 extends towards the eccentric polishing head 3 to stop the flying chips generated during the polishing process of the eccentric polishing head 3.

[0044] Since the protective sleeve 23 is fixedly connected to the waterproof cover 41, the protective sleeve 23 remains stationary during the rotation of the connecting shaft 21 with the motor output shaft 11. In order to ensure the rotation stability of the connecting shaft 21, in some embodiments, a first bearing 24 is arranged between the protective sleeve 23 and the connecting shaft 21, the inner ring surface and the outer ring surface of the first bearing 24 are respectively in abutment with the connecting shaft 21 and the protective sleeve 23, and along the axial direction of the transmission gear ring 22, one end of the first bearing 24 is in abutment with the connecting shaft 21, and the other end is fixed by a first snap spring 25.

[0045] In some embodiments, referring to the accompanying drawings, Figures 3-4As shown, the sealing element includes an annular plate 42, a first sealing ring 43, and a second sealing ring 44. The annular plate 42 is fitted onto the connecting shaft 21 and located between the eccentric grinding head 3 and the first bearing 24. One end of the annular plate 42 abuts against the first bearing 24, and the other end is fixed by a second retaining ring 26. The inner annular surface of the annular plate 42 is sealed against the connecting shaft 21 by the first sealing ring 43, and the outer annular surface of the annular plate 42 is sealed against the protective sleeve 23 by the second sealing ring 44. The cooperation between the first bearing 24 and the second retaining ring 26 can limit the position of the annular plate 42. Furthermore, the cooperation between the annular plate 42, the first sealing ring 43, and the second sealing ring 44 can effectively suppress the movement of water on the eccentric grinding head 3 towards the motor 1 via the connecting shaft 21 or the protective sleeve 23.

[0046] Furthermore, limiting grooves for accommodating the first sealing ring 43 and the second sealing ring 44 are respectively provided on the inner and outer ring surfaces of the ring plate 42. When the ring plate 42 is placed between the protective sleeve 23 and the connecting shaft 21, the first sealing ring 43 and the second sealing ring 44 can respectively seal against the connecting shaft 21 and the protective sleeve 23.

[0047] To improve the assembly stability of the ring plate 42, in some embodiments, see Appendix Figure 4 , 6 As shown, the ring plate 42 includes a first ring plate body and a second ring plate body coaxially arranged. The outer diameters of the first and second ring plate bodies are the same, and the aforementioned limiting groove is formed on the outer ring surfaces of the first and second ring plate bodies. The inner diameter of the first ring plate body is smaller than that of the second ring plate body, and the aforementioned limiting groove is formed on the inner ring surface of the first ring plate body. The junction of the first and second ring plate bodies forms a ring plate step surface 421 for abutting against the first bearing 24. Furthermore, the second ring plate body abuts against the protective sleeve 23. This allows the second snap ring 26, connecting shaft 21, first bearing 24, and protective sleeve 23 to provide full axial, radial, and circumferential coverage and limiting of the ring plate 42, thereby ensuring the stability of the assembly position of the ring plate 42.

[0048] In some embodiments, the seal further includes a third sealing ring 45 located between the waterproof cover 41 and the protective sleeve 23 to prevent water from seeping into the motor 1 from the connection between the waterproof cover 41 and the protective sleeve 23. Furthermore, the outer wall of the waterproof cover 41 is provided with a reserved groove for accommodating the third sealing ring 45.

[0049] In some embodiments, the waterproof cover 41 is a cylindrical structure with one end open, and a power cord interface 411 communicating with its interior is provided on the waterproof cover 41. The motor 1 is built into the waterproof cover 41, and the motor output shaft 11 extends from the open end to facilitate connection to the transmission components.

[0050] In some embodiments, one end of the eccentric polishing head 3 is fixed on the connecting shaft 21 by bolts, and the other end extends out of the protective sleeve 23. It should be noted that the eccentric polishing head 3 is a prior art, and the specific structure and working principle thereof will not be described herein.

[0051] The assembling steps of the eccentric electric polishing tool of the present embodiment are as follows:

[0052] (1) A waterproof cover 41 is covered on the motor 1, and the motor output shaft 11 is exposed to the waterproof cover 41; the transmission gear ring 22 is interference fitted on the motor output shaft 11;

[0053] (2) The first bearing 24 is sleeved on the connecting shaft 21 and fixed by the first circlip 25, so that the two ends of the first bearing 24 abut against the connecting shaft 21 and the first circlip 25, respectively;

[0054] (3) The first sealing ring 43 and the second sealing ring 44 are pressed into the inner and outer ring faces of the ring plate 42, respectively, and the ring plate 42 is sleeved on the connecting shaft 21 until the ring plate 42 abuts against the first bearing 24; then it is fixed by the second circlip 26, so that the two ends of the ring plate 42 abut against the first bearing 24 and the second circlip 26, respectively;

[0055] (4) The eccentric polishing head 3 is assembled on the connecting shaft 21 by bolts, and then the protective sleeve 23 is sleeved on the connecting shaft 21 from the end close to the first bearing 24 until the protective sleeve 23 abuts against the ring plate 42;

[0056] (5) The third sealing ring 45 is installed at the predetermined position of the waterproof cover 41, and then the end of the protective sleeve 23 close to the motor 1 is sleeved on the waterproof cover 41, and the protective sleeve 23 is fixed on the waterproof cover 41 by bolts.

[0057] The above embodiments are only for illustrating the technical concept and characteristics of the present application, and the purpose is to enable those skilled in the art to understand the content of the present application and implement it, and cannot limit the protection scope of the present application. Any equivalent changes or modifications made according to the spirit and essence of the present application shall be covered within the protection scope of the present application.

Claims

1. An eccentric motorized polishing tool characterized by, The utility model relates to a motorized eccentric polishing device, comprising a motor, a transmission assembly and a waterproof assembly. The motor is provided with a motor output shaft at one end. The transmission assembly comprises a connecting shaft and a transmission gear ring. The connecting shaft is sleeved on the motor output shaft at one end and connected with an eccentric polishing head at the other end.

2. The eccentric motorized polishing tool of claim 1, wherein, The transmission gear ring is located between the motor output shaft and the connecting shaft and is in interference fit with the motor output shaft.

3. The eccentric motorized polishing tool of claim 2, wherein, The transmission gear ring is in clearance fit with the connecting shaft.

4. The eccentric motorized polishing tool of claim 2, wherein, The transmission gear ring comprises a gear ring body, and the surface of the gear ring body is provided with a plurality of transmission gears in a circumferential array.

5. The eccentric motorized polishing tool of claim 4, wherein, The connecting shaft is provided with a connecting groove at one end facing the motor output shaft.

6. The eccentric motorized polishing tool of claim 1, wherein, The connecting groove is provided with a plurality of transmission grooves corresponding to the transmission gears.

7. The eccentric motorized polishing tool of claim 6, wherein, The transmission gears are located in the corresponding transmission grooves and leave a gap with the transmission grooves.

8. The eccentric motorized polishing tool of claim 7, wherein, The transmission gears and the corresponding transmission grooves leave a gap in the radial direction and the circumferential direction of the transmission gear ring.

9. The eccentric motorized polishing tool of claim 8, wherein, The connecting groove comprises coaxial and interconnected first and second ring grooves.

10. The eccentric motor sander of claim 1 wherein, The radial dimension of the first ring groove is smaller than that of the second ring groove, so that a step surface is formed at the junction of the first and second ring grooves. The radial dimension of the first ring groove is matched with the outer diameter of the gear ring body, and the radial dimension of the second ring groove is matched with the circumference of the groove bottom of the transmission grooves. When the transmission gears are located in the corresponding transmission grooves, a gap is left between the transmission gears and the step surface. The protective sleeve is sleeved on the transmission assembly. One end of the protective sleeve extends towards the motor and is fixed to the waterproof cover, and the other end extends towards the eccentric polishing head. A first bearing is arranged between the protective sleeve and the connecting shaft. One end of the first bearing abuts against the connecting shaft, and the other end is fixed by a first clamping spring. The sealing element comprises a ring plate, a first sealing ring and a second sealing ring. The ring plate is sleeved on the connecting shaft and located between the eccentric polishing head and the first bearing. One end of the ring plate abuts against the first bearing, and the other end is fixed by a second clamping spring. The inner ring surface of the ring plate is sealed against the connecting shaft by the first sealing ring, and the outer ring surface of the ring plate is sealed against the protective sleeve by the second sealing ring. The sealing element further comprises a third sealing ring located between the waterproof cover and the protective sleeve. The waterproof cover is a cylindrical structure with an open end. The waterproof cover is provided with a power line interface communicating with the inside.

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