A handheld sand grinder
By horizontally arranging the grinding head in a hand-held sand mill and using a transmission mechanism, the problem of labor-intensive operation of large sand mills is solved, and the convenient movement of the grinding head and the reduction of labor intensity is achieved.
Patent Information
- Application Number
- CN202010672753.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2020-07-14
- Publication Date
- 2024-12-31
- Estimated Expiration
- 2040-07-14
AI Technical Summary
When the existing straight handheld sand mill is made into a large sand mill, workers need to move the electric motor body unit left and right, which leads to labor-intensive grinding and inconvenient operation.
A hand-held sand mill is designed, with the grinding head arranged horizontally, and the grinding head is rotated horizontally through the transmission mechanism of the long drive shaft and the short drive shaft. The transmission mechanism adopts meshed bevel gears and helical gears, the grinding head axis and the motor. The angle of the output shaft is 10 to 40 degrees, which simplifies the movement of the grinding head.
Workers only need to move the motor body unit back and forth to realize the back and forth of the grinding head, reducing labor intensity and suitable for making large sand mills.
Smart Images
Figure CN111872803B_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the field of electric tools, in particular to a handheld sand grinder. Background Art
[0002] The structure of the existing vertical hand-held sand mill includes: a motor body unit for hand-holding, a long branch pipe extending forward is arranged on the front end of the motor body unit, a long transmission shaft is installed in the long branch pipe through a bearing, the front end of the long transmission shaft extends out of the long branch pipe, a grinding head coaxial with the long transmission shaft is fixedly mounted on the front end of the long transmission shaft, and the types of grinding heads include louver wheel grinding heads, sand rollers equipped with sand rings, etc. The long transmission shaft is driven to rotate by the motor in the motor body unit, so that the grinding head can be driven by the long transmission shaft to rotate and grind. The above-mentioned vertical hand-held sand mill is only suitable for making a small sand mill, because after the grinding head on the vertical hand-held sand mill is coaxially installed with the long transmission shaft, the axis of the grinding head will face the worker holding the sand mill, so that the worker needs to move the motor body unit left and right to move the grinding head when grinding. If the vertical hand-held sand mill is made into a large sand mill, it will be more laborious to move the motor body unit left and right when grinding. Summary of the invention
[0003] The technical problem to be solved by the present invention is to provide a handheld sand grinder which is suitable for being made into a large sand grinder and is relatively labor-saving during grinding.
[0004] In order to solve the above problems, the technical solution adopted by the present invention is: a hand-held sand grinder, comprising: a motor body unit for hand-holding, a long branch tube extending forward is arranged on the front end of the motor body unit, a long transmission shaft is installed in the long branch tube through a bearing, and the long transmission shaft is driven to rotate by the motor in the motor body unit, characterized in that: a transversely arranged short branch tube is arranged on the front end of the long branch tube, the front end of the long branch tube is connected with the middle part of the short branch tube, a transversely arranged short transmission shaft is installed in the short branch tube through a bearing, one end of the short transmission shaft extends out of the short branch tube and is horizontal to the front of the motor body unit for installing a grinding head, so that the grinding head is also horizontal to the front of the motor body unit, and a transmission mechanism that enables the long transmission shaft to drive the short transmission shaft to rotate with the grinding head is arranged at the connecting point of the long branch tube and the short branch tube.
[0005] Furthermore, in the aforementioned handheld sand grinder, the transmission mechanism is a pair of meshing bevel gears, one bevel gear is arranged on the front end of the long transmission shaft, and the other bevel gear is arranged on the short transmission shaft.
[0006] Furthermore, in the aforementioned handheld sand grinder, the long transmission shaft is arranged obliquely relative to the motor output shaft, so that the grinding head installed on the short transmission shaft can be horizontally located in front of the motor body unit.
[0007] Furthermore, in the aforementioned handheld sand grinder, the long transmission shaft is inclined to the right, and the angle between the axis of the long transmission shaft and the axis of the motor output shaft is 10 to 40 degrees.
[0008] Furthermore, in the aforementioned handheld sand grinder, the motor output shaft and the long transmission shaft are mutually transmitted via a pair of meshing bevel gears.
[0009] Furthermore, in the aforementioned handheld sand grinder, a dustproof protective cover covering the grinding head is installed on the short branch pipe, and the installation structure of the dustproof protective cover and the short branch pipe is as follows: the cross-section of the outer wall of the inner end of the short branch pipe close to the grinding head is a regular polygon, and a clamping sleeve is provided on the dustproof protective cover, and the dustproof protective cover can be sleeved on the outer wall of the inner end of the short branch pipe through the clamping sleeve to cover the grinding head, and a avoidance notch for avoiding the long branch pipe when the dustproof protective cover is sleeved from the outside to the inside is provided on the clamping sleeve, and the cross-section of the inner side wall of the clamping sleeve is a regular polygon with an avoidance notch, and the number of sides is the same as the number of sides of the regular polygon of the cross-section of the outer wall of the inner end of the short branch pipe, so that the clamping sleeve can align its inner side wall with the corresponding faces on the outer wall of the inner end of the short branch pipe respectively. The surfaces are fitted together and the sleeve is clamped on the outer wall of the inner end of the short branch pipe, and the clamping sleeve can also undergo elastic deformation under external torsion and rotate on the short branch pipe, so as to adjust the angle of the dust cover. An L-shaped groove is also arranged on the outer wall of the inner end of the short branch pipe. The L-shaped groove consists of a guide groove arranged along the axial direction of the short branch pipe and a limiting groove arranged along the circumference of the short branch pipe. The outer end of the guide groove is open, and a convex point that can be inserted into the L-shaped groove is arranged on the inner wall of the clamping sleeve. When the clamping sleeve is put on the outer wall of the inner end of the short branch pipe from the outside to the inside, the convex point can be inserted into the inner end of the guide groove, and then the clamping sleeve can be rotated by external force to make the convex point inserted into the limiting groove, so that the limiting groove can axially limit the clamping sleeve through the convex point and guide the rotation of the clamping sleeve at the same time.
[0010] Furthermore, the aforementioned hand-held sand grinder, wherein: a round seat is provided on the outer end of the short branch pipe, a threaded hole is provided on the outer end of the round seat, and a stabilizing cover is also provided on the dust protection cover, which can cover the round seat when the clamping sleeve is mounted on the outer side wall of the inner end of the short branch pipe, the stabilizing cover is connected and fixed to the dust protection cover through a rib plate, so that when the dust protection cover rotates, it can rotate with the stabilizing cover, a through hole is provided on the outer end of the stabilizing cover, a knob is inserted in the through hole that can be movably rotatable and can abut against the stabilizing cover inwardly but cannot be separated from the through hole outwardly, and a stud is provided at the center of the inner end of the knob, which can be screwed into the threaded hole by rotating the knob when the stabilizing cover is covered on the round seat, and the knob can abut against the stabilizing cover after being tightened by screwing the stud into the threaded hole.
[0011] Furthermore, in the aforementioned hand-held sander, the mounting structure of the stabilizing cover and the knob is as follows: a plurality of elastic convex edges arranged at intervals around the axial direction of the knob are provided on the inner end surface of the knob, and a wedge platform with a wedge-shaped inclined surface is provided on the outer edge of the free end of each elastic convex edge. When the elastic convex edges on the knob are inserted into the through hole on the stabilizing cover together, the inclined surfaces on each wedge platform will first contact and abut against the edge of the through hole, and then as the insertion proceeds, the through hole will press each wedge platform inwardly through each inclined surface, so that each elastic convex edge can undergo elastic deformation and its free end can tilt inwardly, thereby allowing each wedge platform to pass through the through hole. After passing through the through hole, each wedge platform will expand outwardly and reset, so that each wedge platform can hook the inner wall of the through hole of the stabilizing cover from the inside, thereby preventing the knob from detaching from the through hole outwardly, but the knob can rotate on the through hole with each elastic convex edge as the axis.
[0012] Furthermore, in the aforementioned handheld sand grinder, two L-shaped grooves are provided, two convex points are provided, and the two convex points correspond one-to-one to the two L-shaped grooves respectively.
[0013] Furthermore, in the aforementioned handheld sander, a dust suction port for an external vacuum cleaner is provided on the dust protection cover, and a safety baffle is provided in the dust suction port for preventing fingers from being inserted.
[0014] The advantages of the present invention are as follows: the grinding head in the handheld sand grinder is horizontally arranged in front of the motor body unit in the left-right direction, so that the worker only needs to move the motor body unit forward and backward to move the grinding head back and forth for grinding. Compared with moving the motor body unit left and right, it is more convenient and easy to operate for the worker to move the motor body unit forward and backward, which is also more labor-saving and can reduce labor intensity. It is relatively more suitable for making a large sand grinder. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] Figure 1 The present invention is a schematic diagram of the internal structure of a handheld sand grinder.
[0016] Figure 2 It is a schematic diagram of the three-dimensional structure of a handheld sand grinder according to the present invention.
[0017] Figure 3 The present invention is a schematic diagram of the three-dimensional structure of a handheld sand grinder equipped with a dustproof protective cover.
[0018] Figure 4 for Figure 3 A schematic diagram of the three-dimensional structure of the dust protection cover from one perspective is shown in FIG.
[0019] Figure 5 for Figure 3 A schematic diagram of the three-dimensional structure of the dust protection cover from another perspective is shown in FIG.
[0020] Figure 6 for Figure 4 Schematic diagram of the three-dimensional structure of the knob shown in . DETAILED DESCRIPTION
[0021] The present invention is further described in detail below in conjunction with specific embodiments and drawings.
[0022] like Figure 1 , Figure 2 As shown, a handheld sand grinder comprises: a motor body unit 1 for hand-holding, a long branch pipe 11 extending forward is arranged on the front end of the motor body unit 1, a long transmission shaft 2 is installed in the long branch pipe 11 through a bearing, and the long transmission shaft 2 is driven to rotate by a motor 12 in the motor body unit 1, a short branch pipe 13 arranged horizontally is arranged on the front end of the long branch pipe 11, the front end of the long branch pipe 11 is connected to the middle part of the short branch pipe 13, and a short branch pipe 13 arranged horizontally is installed in the short branch pipe 13 through a bearing. A short transmission shaft 3, one end of the short transmission shaft 3 extends out of the short branch pipe 13 and is horizontal to the front of the motor body unit 1 for installing the grinding head 9, so that the grinding head 9 is also horizontal to the front of the motor body unit 1, and a transmission mechanism is provided at the connection point between the long branch pipe 11 and the short branch pipe 13, which can enable the long transmission shaft 2 to drive the short transmission shaft 3 to rotate with the grinding head 9. In this embodiment, the transmission mechanism is a pair of meshing bevel gears 7, one bevel gear 7 is provided on the front end of the long transmission shaft 2, and the other bevel gear 7 is provided on the short transmission shaft 3.
[0023] In this embodiment, the long transmission shaft 2 is arranged obliquely relative to the output shaft of the motor 12, so that the grinding head 9 mounted on the short transmission shaft 3 can be horizontally arranged in front of the motor body unit 1. In this embodiment, the long transmission shaft 2 is inclined to the right, and the angle α between the axis of the long transmission shaft 2 and the axis of the output shaft of the motor 12 is 20 degrees. The output shaft of the motor 12 and the long transmission shaft 2 are mutually driven through a pair of meshing helical gears 6.
[0024] In the handheld sand grinder with the above structure, the axis of the grinding head is horizontal to the left and right in front of the motor body unit, so that the worker only needs to move the motor body unit forward and backward to move the grinding head back and forth for grinding. Compared with moving the motor body unit left and right, it is more convenient and easy for workers to move the motor body unit forward and backward, which will also save more effort and reduce labor intensity. It is relatively more suitable for making a large sand grinder.
[0025] In this embodiment, if Figure 2 , Figure 3 , Figure 4 , Figure 5As shown, a dust cover 8 covering the grinding head 9 is installed on the short branch pipe 13. The installation structure of the dust cover 8 and the short branch pipe 13 is as follows: the cross-section of the outer wall of the inner end of the short branch pipe 13 close to the grinding head 9 is a regular polygon. A clamping sleeve 81 is provided on the dust cover 8. The dust cover 8 can be sleeved on the outer wall of the inner end of the short branch pipe 13 through the clamping sleeve 81 to cover the grinding head 9. A clamping sleeve 81 is provided on the clamping sleeve 81. The dust protection cover 8 is used to avoid the avoidance notch 82 of the long branch pipe 11. The cross section of the inner side wall of the clamping sleeve 81 is a regular polygon with an avoidance notch, and the number of sides is the same as the number of sides of the regular polygon of the cross section of the inner end outer wall of the short branch pipe 13, so that the clamping sleeve 81 can be clamped on the inner end outer wall of the short branch pipe 13 by fitting each surface on its inner side wall with the corresponding surface on the inner end outer wall of the short branch pipe 13, and the clamping sleeve 81 can also be elastically deformed under external torsion and rotate on the short branch pipe 13, so that the angle of the dust protection cover 8 can be adjusted to make it located in a suitable protection position. In actual production, the clamping sleeve 81 made of plastic material can make it have the performance of elastic deformation when rotating. An L-shaped groove 4 is also provided on the inner end outer wall of the short branch pipe 13. The L-shaped groove 4 is composed of a guide groove 41 arranged along the axial direction of the short branch pipe 13 and a limit groove 42 arranged along the circumferential direction of the short branch pipe 13. The guide groove 41 The outer end is open, and a protrusion 83 that can be inserted into the L-shaped groove 4 is provided on the inner side wall of the clamping sleeve 81. When the clamping sleeve 81 is mounted on the outer side wall of the inner end of the short branch pipe 13 from the outside to the inside, the protrusion 83 can be inserted into the inner end of the guide groove 41, and then the clamping sleeve 81 can be rotated by external force to make the protrusion 83 inserted into the limiting groove 42, so that the limiting groove 42 can axially limit the clamping sleeve 81 through the protrusion 83 and guide the rotation of the clamping sleeve 81.
[0026] In this embodiment, two L-shaped grooves 4 are provided, and two convex points 83 are provided, and the two convex points 83 correspond to the two L-shaped grooves 4 one by one. After such arrangement, the dust protection cover 8 can be installed more reliably.
[0027] The installation structure of the dustproof protective cover 8 is arranged in this way, so that the installation of the dustproof protective cover 8 becomes convenient and quick, and the angle position of the dustproof protective cover 8 can be easily adjusted, so that when the dustproof protective cover 8 interferes with grinding, the dustproof protective cover 8 can be adjusted to avoid it.
[0028] In this embodiment, a round seat 14 is provided on the outer end of the short branch pipe 13, and a threaded hole 15 is provided on the outer end of the round seat 14. A stabilizing cover 84 is also provided on the dust protection cover 8, which can cover the round seat 14 when the clamping sleeve 81 is mounted on the outer wall of the inner end of the short branch pipe 13. The stabilizing cover 84 is connected and fixed to the dust protection cover 8 through a rib plate 85, so that when the dust protection cover 8 rotates, it can rotate with the stabilizing cover 84. A through hole is provided on the outer end of the stabilizing cover 84, and a knob 5 is inserted in the through hole, which can be movably rotated and can abut against the stabilizing cover 84 inwardly but cannot be separated from the through hole outwardly. A stud 51 is provided at the center of the inner end of the knob 5, which can be screwed into the threaded hole 15 by rotating the knob 5 when the stabilizing cover 84 covers the round seat 14. The knob 5 can abut against the stabilizing cover 84 after being tightened by screwing the stud 51 into the threaded hole 15.
[0029] The stabilizing cover 84 covers the round seat 14 , and the knob 5 abuts against the stabilizing cover 84 , so that the dustproof protective cover 8 can be installed more reliably.
[0030] When adjusting the angle of the dust protection cover 8 , it is only necessary to loosen the stud 51 . However, when disassembling the dust protection cover 8 , the stud 51 must be withdrawn from the threaded hole 15 .
[0031] like Figure 5 , Figure 6 As shown, the installation structure of the stabilizing cover 84 and the knob 5 is as follows: four elastic flanges 52 are arranged axially around the knob 5 at intervals on the inner end surface of the knob 5, and a wedge platform 53 with a wedge-shaped inclined surface 54 is arranged on the outer edge of the free end of each elastic flange 52. When the elastic flanges 52 on the knob 5 are inserted into the through hole on the stabilizing cover 84 together, the inclined surface 54 on each wedge platform 53 will first contact and abut against the edge of the through hole, and then as the insertion is carried out, the through hole will be closed. Each wedge platform 53 will be pressed inward through each inclined surface 54, so that each elastic flange 52 can be elastically deformed so that its free end can tilt inward and move closer, so that each wedge platform 53 can pass through the through hole. After passing through the through hole, each wedge platform 53 will expand outward and reset, so that each wedge platform 53 can hook the inner wall of the through hole of the stabilizing cover 84 from the inside, so that the knob 5 cannot be separated from the through hole outward, but the knob 5 can rotate on the through hole with each elastic flange 52 as the axis.
[0032] The dustproof protective cover 8 is provided with a dust suction port 86 for connecting an external dust collector, and the dust suction port 86 is provided with a safety blocking piece 87 for blocking fingers from being inserted.
Claims
1. A handheld sand grinder, comprising: The electric motor unit for hand-holding has a long branch tube extending forwardly arranged on the front end of the electric motor unit, a long transmission shaft is installed in the long branch tube through a bearing, and the long transmission shaft is driven to rotate by the motor in the electric motor unit, characterized in that a short branch tube arranged transversely is arranged on the front end of the long branch tube, the front end of the long branch tube is connected with the middle part of the short branch tube, a short transmission shaft arranged transversely is installed in the short branch tube through a bearing, one end of the short transmission shaft extends out of the short branch tube and is transverse to the front of the electric motor unit for installing a grinding head, so that the grinding head is also transverse to the front of the electric motor unit, and the grinding head is installed in the long branch tube. A transmission mechanism is provided at the connection point between the tube and the short branch tube, which can enable the long transmission shaft to drive the short transmission shaft to rotate with the grinding head; the long transmission shaft is inclined to the right, and the angle between the axis of the long transmission shaft and the axis of the motor output shaft is 10 to 40 degrees; the motor output shaft and the long transmission shaft are mutually transmitted through a pair of meshing helical gears; a dustproof protective cover covering the top of the grinding head is installed on the short branch tube, and the installation structure of the dustproof protective cover and the short branch tube is as follows: the cross-section of the outer wall of the inner end of the short branch tube close to the grinding head is a regular polygon, and a clamping sleeve is provided on the dustproof protective cover, and the dustproof protective cover can be installed through the clamping sleeve The clamping sleeve is arranged on the outer wall of the inner end of the short branch pipe and covers the grinding head. A relief notch is arranged on the clamping sleeve for avoiding the long branch pipe when the dust protection cover is installed from the outside to the inside. The cross section of the inner wall of the clamping sleeve is a regular polygon with the relief notch, and the number of sides is the same as the number of sides of the regular polygon of the cross section of the outer wall of the inner end of the short branch pipe, so that the clamping sleeve can be clamped on the outer wall of the inner end of the short branch pipe by fitting each face on the inner wall with the corresponding face on the outer wall of the inner end of the short branch pipe, and the clamping sleeve can also be elastically deformed under external force torsion and rotate on the short branch pipe, so as to adjust the dust protection cover. The angle of the protective cover is that an L-shaped groove is also provided on the outer side wall of the inner end of the short branch pipe, and the L-shaped groove is composed of a guide groove arranged along the axial direction of the short branch pipe and a limiting groove arranged along the circumference of the short branch pipe. The outer end of the guide groove is open, and a convex point that can be inserted into the L-shaped groove is provided on the inner side wall of the clamping sleeve. When the clamping sleeve is sleeved on the outer side wall of the inner end of the short branch pipe from the outside to the inside, the convex point can be inserted into the inner end of the guide groove, and then the clamping sleeve can be rotated by external force to make the convex point inserted into the limiting groove, so that the limiting groove can axially limit the clamping sleeve through the convex point and guide the rotation of the clamping sleeve at the same time;A round seat is arranged on the outer end of the short branch pipe, and a threaded hole is arranged on the outer end of the round seat. A stabilizing cover is also arranged on the dust protection cover, which can cover the round seat when the clamping sleeve is mounted on the outer side wall of the inner end of the short branch pipe. The stabilizing cover is connected and fixed to the dust protection cover by a rib plate, so that the dust protection cover can rotate with the stabilizing cover when it rotates. A through hole is arranged on the outer end of the stabilizing cover, and a knob is inserted in the through hole, which can be movably rotated and can abut against the stabilizing cover inwardly but cannot be separated from the through hole outwardly. A stud is arranged at the center of the inner end of the knob, which can be screwed into the threaded hole by rotating the knob when the stabilizing cover is covered on the round seat, and the knob can abut against the stabilizing cover after being tightened by screwing the stud into the threaded hole. The installation structure of the stabilizing cover and the knob is as follows: a plurality of elastic convex edges arranged at intervals around the axial direction of the knob are arranged on the inner end surface of the knob, and the outer edge of the end of the free end of each elastic convex edge is arranged A wedge platform with a wedge-shaped inclined surface is provided on each of the wedge platforms. When the elastic convex edges on the knob are inserted into the through hole on the stable cover together, the inclined surfaces on each wedge platform will first contact and abut against the edge of the through hole, and then as the insertion progresses, the through hole will press each wedge platform inward through each inclined surface, so that each elastic convex edge can be elastically deformed so that its free end can be tilted inward and close together, so that each wedge platform can pass through the through hole. After passing through the through hole, each wedge platform will expand outward and reset, so that each wedge platform can hook the inner wall of the through hole of the stable cover from the inside, so that the knob cannot be separated from the through hole outward, but the knob can rotate on the through hole with each elastic convex edge as the axis; two L-shaped grooves are provided, and two convex points are provided, and the two convex points correspond to the two L-shaped grooves one by one; a dust suction port for an external vacuum cleaner is provided on the dust protection cover, and a safety baffle is provided in the dust suction port for preventing fingers from being inserted. ; 2. A handheld sand grinder according to claim 1, characterized in that: The transmission mechanism is a pair of meshing bevel gears, one bevel gear is arranged on the front end of the long transmission shaft, and the other bevel gear is arranged on the short transmission shaft.
3. A handheld sand grinder according to claim 1 or 2, characterized in that: The long transmission shaft is arranged obliquely relative to the motor output shaft, so that the grinding head installed on the short transmission shaft can be horizontally arranged in front of the motor body unit.