Non-equal-thickness drum brake pad automatic outer arc grinding machine
Technical Field
The invention relates to the field of friction plate processing equipment, in particular to an automatic outer arc grinding machine for a non-uniform-thickness drum brake pad.
Background
In the braking system of the automobile, a brake pad is the most critical safety part and plays a decisive role in the braking effect. With the development of economy and industry and the increase of the number of automobiles, the demand of brake pads is increasing. The brake pad is rough after hot press forming, the end face, the inner and outer arc surfaces, the chamfered edge and the like of the brake pad need to be polished, the existing outer arc grinding machine for the brake pad can only grind drum brake pads with equal thickness, drum brake pads with unequal thickness cannot be machined, and only a numerical control machine with high price can be used for machining. In addition, the feeding is carried out in a manual stacking mode, the automatic feeding device is only suitable for single-machine production, the requirements of an automatic production line cannot be met, and the automatic feeding device has the defects of low automation level, high labor intensity of workers and low production efficiency.
Disclosure of Invention
The invention aims to provide an automatic outer arc grinding machine for a non-equal-thickness drum brake pad, which has high processing precision and high production efficiency and can realize automatic grinding of the outer arc of the non-equal-thickness drum brake pad.
In order to achieve the purpose, the technical scheme provided by the invention is as follows:
an automatic outer arc grinding machine for non-equal-thickness drum brake pads comprises a feeding device, a positioning feeding device and a grinding device, wherein the feeding device is provided with a thickness detection device, and the positioning feeding device is used for positioning the brake pads transmitted by the feeding device and feeding the brake pads to a grinding station for grinding; the positioning and feeding device comprises a sleeve, a feeding shaft, a feeding turntable and an arc positioning plate, wherein the feeding shaft is arranged in the sleeve, the feeding turntable is arranged above the feeding shaft and rotates along with the feeding shaft, and the arc positioning plate is arranged between an upper flange and a lower flange of the feeding turntable along the circumferential direction.
Furthermore, the feeding device also comprises a vertical plate servo motor which is used for driving the brake plate to be erected to a vertical position from a horizontal position of the conveying belt and pushed into the positioning and feeding device.
Furthermore, a positioning block is fixed on the side surface of the arc positioning plate; the positioning block drives the brake block to rotate and feed along with the feeding turntable.
Furthermore, the arc-shaped positioning plate and the feeding turntable are installed in an offset mode, so that the axis of the outer arc cylindrical surface of the brake pad is overlapped with the axis of the feeding turntable, and the precision of grinding the drum brake pad with unequal thickness is guaranteed.
Furthermore, the polishing device comprises a lower slide carriage, a middle slide carriage, an upper slide carriage, a grinding wheel motor, a screw rod and nut mechanism and a hand wheel; the lower slide carriage is fixed on the frame, the middle slide carriage is connected on the lower slide carriage through a dovetail groove, the upper slide carriage is connected on the middle slide carriage through a dovetail groove, a grinding wheel seat is fixed on the upper slide carriage, a grinding wheel is mounted on a main shaft of the grinding wheel seat, and the hand wheel and the screw rod nut mechanism can enable the middle slide carriage to transversely move so as to adjust the grinding width.
Further, the hand wheel and the lead screw nut mechanism can enable the upper slide carriage to move longitudinally so as to adjust the distance between the grinding wheel and the brake pad.
Furthermore, the grinding device is also provided with a dust cover, the dust cover forms a semi-closed structure, a rectangular gap is reserved between the grinding wheel and the brake pad, and a circular pipe connected with a negative pressure system is arranged at the lower part of the dust cover and used for removing dust.
Furthermore, the positioning and feeding device is also provided with a frame, the frame is also provided with a right-angle speed reducer, the speed reducer is connected with a feeding motor, and the feeding motor is fixedly connected to the frame through the speed reducer; the feeding motor drives the feeding shaft to rotate through V-shaped belt transmission.
Further, the feeding shaft is connected with a bearing set, and the bearing set comprises a thrust bearing and a pair of radial bearings.
Furthermore, the radius of the outer arc of the arc-shaped positioning plate is equal to the radius of the inner arc of the brake pad.
Advantageous effects
An arc-shaped positioning plate is arranged between an upper flange and a lower flange of a feeding turntable in the positioning and feeding device along the circumferential direction, the radius of an outer arc of the arc-shaped positioning plate is equal to that of an inner arc of a brake pad, the arc-shaped positioning plate and the feeding turntable are installed in an offset mode, the axis of the outer arc cylindrical surface of the brake pad is overlapped with the axis of the feeding turntable, the motion track of the outer arc of the brake pad is ensured to be on the same cylindrical surface, the grinding machining precision is improved, and the machining requirement for grinding drum brake pads with unequal thickness can be met. The pollution of dust to the environment in the course of working has effectively been reduced through protecting the dust cover entirely.
The automatic outer arc grinding machine for the non-uniform-thickness drum brake pads can adapt to various drum brake pads with different sizes by replacing the arc-shaped positioning plates, can realize automatic feeding, outer arc grinding and automatic discharging, has higher automation degree and accurate positioning, reduces defective rate and can effectively improve production efficiency.
Drawings
FIG. 1 is a schematic diagram of the general structure of a grinding machine;
FIG. 2 is a partial cutaway view of the positioning and feeding device;
FIG. 3 is a top view of the positioning and feeding device;
fig. 4 is a schematic view of a grinding apparatus.
Reference numerals: 1. a feeding device; 2. positioning a feeding device; 3. a polishing device; 101. a vertical slice servo motor; 201. a feed motor; 202. a right-angle reducer; 203. v-belt transmission; 204. a feed shaft; 205. a sleeve; 206. a bearing set; 207. a frame; 208. positioning blocks; 209. a feed turntable; 210. keys and fastening screws; 211. an arc-shaped positioning plate; 212. fastening screws; 213. a brake pad; 301. a lower slide carriage; 302. a middle slide carriage; 303. a feed screw nut mechanism; 304. an upper slide carriage; 305. v-belt transmission; 306. a grinding wheel motor; 307. a grinding wheel seat; 308. a grinding wheel; 309. a dust cover; 310. and the screw rod and nut mechanism.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "vertical", "horizontal", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or the orientations or positional relationships that the products of the present invention are conventionally placed in when used, and are only used for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.
Furthermore, the terms "horizontal", "vertical", "overhang" and the like do not imply that the components are required to be absolutely horizontal or overhang, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Examples
The following detailed description of embodiments of the invention refers to the accompanying drawings.
Referring to fig. 1, an automatic outer arc grinding machine for a non-uniform thickness drum brake pad includes a feeding device 1, a positioning feeding device 2, and a polishing device 3.
The feeding device 1 is provided with a thickness detection device, and the thickness detection device is two microswitches symmetrically arranged and used for detecting the thick surface of the brake pad;
the feeding device 1 further comprises a vertical plate servo motor 101 which is used for driving a brake block to be erected from the horizontal position to the vertical position of the conveying belt and pushed into the positioning feeding device 2, so that the automatic feeding function is realized;
when the thickness detection device detects that the thick surface of the brake pad is on one side of the servo motor, the microswitch on one side of the servo motor is triggered, the microswitch on the other side is not triggered, the control system sends a signal to enable the lifting cylinder to ascend, the rotating cylinder to rotate, then the lifting cylinder descends again to enable the brake pad to turn around, and the thick surface of the brake pad is guaranteed to be always away from one side of the vertical pad servo motor 101.
Referring to fig. 2 and 3, the positioning and feeding device 2 is used for positioning the brake pad transmitted by the feeding device and feeding the brake pad to the grinding device 3 for grinding, and the positioning and feeding device 2 includes a frame 207, a sleeve 205, a feeding shaft 204, a feeding turntable 209, an arc positioning plate 211, and the like; the sleeve 205 is vertically fixed on the frame 207 through a screw, the feed shaft 204 is installed inside the sleeve 205, the feed shaft 204 is connected with the bearing set 206, and the bearing set 206 comprises a thrust bearing and a pair of radial bearings;
the rack 207 is also provided with a right-angle reducer 202, the right-angle reducer 202 is connected with a feeding motor 201, and the feeding motor 201 is fixedly connected to the rack 207 through the right-angle reducer 202; the feeding motor 201 drives the feeding shaft 204 to rotate through a V-shaped belt transmission 203;
a feeding turntable 209 is also arranged above the feeding shaft 204, the feeding turntable 209 is fixed at the upper end of the feeding shaft 204 through a key and a fastening screw 210 and rotates along with the feeding shaft 204, and the feeding turntable 209 is in clearance fit with the rack 207. The feeding turntable 209 is of an I-shaped cylindrical structure, four arc positioning plates 211 are uniformly arranged between the upper flange and the lower flange of the feeding turntable 209 along the circumferential direction, the outer arc radius of each arc positioning plate 211 is equal to the inner arc radius of the brake pad 213, each arc positioning plate 211 is fixedly connected with the feeding turntable 209 through four upper fastening screws 212 and four lower fastening screws 212, so that the arc positioning plates 211 and the feeding turntable 209 are arranged in an offset manner, the arc positioning plates 211 are subjected to integral finish machining after assembly, the axial line of the outer arc of the cylindrical surface of the brake pad 213 is ensured to be coincident with the axial line of the feeding turntable 209, and positioning blocks 208 are further fixed on the side surfaces of the arc positioning plates 211; the positioning block 208 is fixed on the side surface of the arc positioning plate 211 through a screw, and is used for driving the brake pad to rotate along with the feeding turntable 209 and bearing the circumferential cutting force generated in the grinding process.
Referring to fig. 4, the polishing device 3 is used for grinding the brake pad and then transferring the brake pad onto a discharge conveyor belt after the grinding is completed, and the polishing device 3 includes a lower slide carriage 301, a middle slide carriage 302, an upper slide carriage 304, a grinding wheel seat 307, lead screw and nut mechanisms 303 and 310, a hand wheel, and the like. The lower slide carriage 301 is fixed on the rack 207, the middle slide carriage 302 is connected on the lower slide carriage through a dovetail groove, the upper slide carriage 304 is connected on the middle slide carriage 302 through a dovetail groove, a grinding wheel seat 307 is fixed on the upper slide carriage 304, a grinding wheel 308 is installed on a main shaft of the grinding wheel seat 307, and the grinding wheel 308 is driven by a grinding wheel motor 306 and a V-shaped belt transmission 305; the upper carriage 304 is moved longitudinally by a hand wheel and lead screw nut mechanism 303 to adjust the distance between the grinding wheel and the brake pad to ensure the outer arc grinding dimension, and the middle carriage 302 is moved transversely by a hand wheel and lead screw nut mechanism 310 to adjust the grinding width. The grinding device 3 is further provided with a dust cover 309, the dust cover 309 forms a semi-closed structure, a rectangular gap is reserved between the grinding wheel 308 and the brake pad and used for grinding the brake pad, and the dust cover 309 is fixed on the rack 207 and is connected with the filter screen and the negative pressure system through a lower circular tube to remove dust.
During the use, adjust the thick face of brake block to keeping away from upright piece servo motor one side through feed arrangement earlier, then through the work of founding piece servo motor, erect the brake block to the vertical position from the horizontal position of conveyer belt to push into positioning feed device, positioning feed device fixes a position the brake block that feed arrangement conveyed and come, and feed to the station of polishing and grind, convey discharge apparatus with the brake block after the grinding is accomplished again.
In summary, according to the automatic outer arc grinding machine for the non-equal-thickness drum brake pads, the arc-shaped positioning plate is circumferentially arranged between the upper flange and the lower flange of the feeding turntable in the positioning and feeding device, the automatic outer arc grinding machine is suitable for drum brake pads of various sizes by replacing the arc-shaped positioning plate, the arc-shaped positioning plate and the feeding turntable are installed in an offset mode, the axis of the outer arc cylindrical surface of each brake pad is overlapped with the axis of the feeding turntable, the movement track of the outer arc of each brake pad is ensured to be on the same cylindrical surface, the grinding machining precision is improved, and the machining requirement for grinding the non-equal-thickness drum brake pads can be met. The invention also effectively reduces the pollution of dust to the environment in the processing process through the full-protection dust cover. The non-uniform-thickness drum brake pad automatic outer arc grinding machine provided by the invention can realize automatic feeding, outer arc grinding and automatic discharging, has higher automation degree and accurate positioning, reduces the defective rate and can effectively improve the production efficiency.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.