阅读说明：本技术 一种金刚石刀头磨削设备的砂轮黏附物清除装置 (Grinding wheel adhered object removing device of diamond tool bit grinding equipment ) 是由 张松周 于 2021-06-22 设计创作，主要内容包括：本发明公开了金刚石刀头磨削设备技术领域的一种金刚石刀头磨削设备的砂轮黏附物清除装置,包括砂轮主体,所述砂轮主体后侧圆心处固定有砂轮轴,且砂轮轴后端与驱动装置输出端固定,所述砂轮轴外壁活动套设有砂轮罩,且砂轮罩后侧顶部固定有安装架,所述砂轮罩前侧右端固定有承接块,且承接块后侧设置有砂轮黏附物清除件。本发明在砂轮轴带动砂轮主体转动进行工作时,通过顶杆带动顶板使连接杆带动弹性伸缩杆和耐磨刮块向下接触砂轮实现对砂轮主体的间歇性清除作业,一方面降低了耐磨刮块的磨损,延长耐磨刮块的使用寿命,另一方面降低了耐磨刮块与砂轮主体持续接触摩擦产生的热量,进一步延长耐磨刮块的使用寿命。(The invention discloses a grinding wheel adhesive removing device of diamond tool bit grinding equipment in the technical field of diamond tool bit grinding equipment, which comprises a grinding wheel main body, wherein a grinding wheel shaft is fixed at the center of the rear side of the grinding wheel main body, the rear end of the grinding wheel shaft is fixed with the output end of a driving device, a grinding wheel cover is movably sleeved on the outer wall of the grinding wheel shaft, an installation frame is fixed at the top of the rear side of the grinding wheel cover, a bearing block is fixed at the right end of the front side of the grinding wheel cover, and a grinding wheel adhesive removing piece is arranged at the rear side of the bearing block. When the grinding wheel main body is driven by the grinding wheel shaft to rotate to work, the ejector rod drives the top plate to enable the connecting rod to drive the elastic telescopic rod and the wear-resistant scraping block to downwards contact with the grinding wheel, so that intermittent cleaning operation on the grinding wheel main body is realized, on one hand, abrasion of the wear-resistant scraping block is reduced, the service life of the wear-resistant scraping block is prolonged, on the other hand, heat generated by continuous contact friction between the wear-resistant scraping block and the grinding wheel main body is reduced, and the service life of the wear-resistant scraping block is further prolonged.)

1. The utility model provides a diamond segments grinding equipment's emery wheel adhesion thing clearing device, includes emery wheel main part (1), its characterized in that: a grinding wheel shaft (2) is fixed at the center of the rear side of a grinding wheel main body (1), the rear end of the grinding wheel shaft (2) is fixed with the output end of a driving device, a grinding wheel cover (7) is movably sleeved on the outer wall of the grinding wheel shaft (2), an installation frame (6) is fixed at the top of the rear side of the grinding wheel cover (7), a bearing block (3) is fixed at the right end of the front side of the grinding wheel cover (7), a grinding wheel adhered object removing piece (4) is arranged at the rear side of the bearing block (3), the grinding wheel adhered object removing piece (4) comprises an intermittent assembly (41) arranged on the grinding wheel shaft (2), the top of the intermittent assembly (41) is movably abutted with a push rod (42), the top of the push rod (42) is movably penetrated through the right side of the installation frame (6) up and fixedly connected with a top plate (45), a balancing weight (46) is fixed at the top of the top plate (45), a connecting rod (47) is fixed at the left side of the bottom of the top plate (45), and an elastic telescopic rod (48) is fixed at the bottom of the connecting rod (47), the bottom of the elastic telescopic rod (48) is detachably fixed with a wear-resistant scraping block (49) attached to the top of the grinding wheel main body (1).

2. The device for removing the adhering matter of the grinding wheel of a diamond segments grinding equipment according to claim 1, wherein: l-shaped support frames (44) are fixed to the right side of the top of the mounting frame (6), the top of each ejector rod (42) penetrates through the L-shaped support frames (44) from top to bottom, a first spring is sleeved on the outer wall of each ejector rod (42) and located between the L-shaped support frames (44) and the mounting frame (6), an anti-adhesion mechanism (5) is arranged at the top of each L-shaped support frame (44), a wear-resistant scraping block (49) is located on the left of a grinding wheel cover (7), and an anti-adhesion plate (43) is arranged on the left of the wear-resistant scraping block (49).

3. The device for removing the adhering matter of the grinding wheel of a diamond segments grinding equipment according to claim 2, characterized in that: the intermittent assembly (41) comprises a small gear (411) fixedly sleeved on the outer wall of the grinding wheel shaft (2), a large gear (412) is meshed on the right side of the small gear (411), and the circle center of the big gear (412) is fixedly provided with an installation shaft, the front end of the installation shaft is movably connected with the outer wall of the rear side of the grinding wheel cover (7) through a bearing, the outer wall of the installation shaft and the position of the front side of the big gear (412) are fixedly sleeved with a wheel disc (413), the outer wall of the circumference of the wheel disc (413) is provided with an incomplete tooth section, the right side of the wheel disc (413) is provided with a connecting gear meshed with the incomplete tooth section, and the center of the circle of the connecting gear is fixed with a shaft body, the front end of the shaft body is movably connected with the right end of the rear side of the bearing block (3) through a bearing, a cam corresponding to the ejector rod (42) is fixedly sleeved on the outer wall of the shaft body and at the rear part of the connecting gear, and the bottom of the ejector rod (42) is in sliding butt joint with the cam through a ball.

4. The device for removing the adhering matter of the grinding wheel of a diamond segments grinding equipment according to claim 3, characterized in that: the anti-adhesion mechanism (5) comprises a contact gear (51) movably arranged at the top of an L-shaped support frame (44) through a support and a shaft body, teeth meshed with the contact gear (51) are uniformly arranged on the outer wall of the left side of a push rod (42) from top to bottom, a roller body (52) is coaxially connected in front of the contact gear (51), a rope body (53) is wound on the roller body (52), the L-shaped support frame is fixed on the left side of the top of the mounting frame (6), a T-shaped sliding block matched with the support frame is arranged on the outer wall of one side, facing the mounting frame (6), of the support frame in a sliding mode through a transverse T-shaped sliding groove, the other end of the rope body (53) penetrates through the right end of the support frame and is fixed with the right side of the T-shaped sliding block, a second spring (58) is sleeved on the outer wall, positioned in the T-shaped sliding groove, and a mounting plate is fixed at the bottom of the T-shaped sliding block, and a scraping block processing piece (54) matched with the wear-resistant scraping block (49) is fixed on the right side of the mounting plate.

5. The device for removing the adhering matter of the grinding wheel of a diamond segments grinding equipment according to claim 4, wherein: scrape piece (54) including fixing processing mechanism (541) on the mounting panel right side, be provided with trigger piece (542) on processing mechanism (541), processing mechanism (541) is including fixing on the mounting panel right side and right side for hollow casing (5411), casing (5411) left side activity is pegged graft there is the hose, and casing (5411) interior left side is fixed with shunt tubes (5412), the hose right-hand member communicates with shunt tubes (5412), shunt tubes (5412) right-hand member evenly is provided with the nozzle that is linked together, the hose left end runs through the mounting panel and is connected through pipeline and confession liquid device (57) output, and confession liquid device (57) are fixed at the support frame top.

6. The device for removing adhering matter of a grinding wheel of a diamond segments grinding apparatus according to claim 5, wherein: casing (5411) top right side activity is pegged graft and is had activity pole (5413) that the perpendicular cross-section is T shape, and activity pole (5413) right side bottom is fixed with and prevents gluing and attach board (43) complex clearance piece (5415), ball and contact dish (5414) bottom activity butt are passed through at activity pole (5413) top, contact dish (5414) rear side is connected with driving motor output off-centre, driving motor fixes on the support at casing (5411) top, activity pole (5413) outer wall top cover is equipped with reset spring.

Technical Field

The invention relates to the technical field of diamond tool bit grinding equipment, in particular to a grinding wheel adhesive removing device of diamond tool bit grinding equipment.

Background

The diamond tip is the working body of the diamond cutting tool. One end part of the diamond tool bit is formed by sintering alloy powder, and the end surface is called as a tool face; the other end is made mainly of iron and this end surface is called the bottom surface.

The bottom surface of the diamond tool bit needs to be ground, so that the bottom surface is ensured to be matched with the connecting surface of the diamond saw blade matrix. In order to improve the efficiency of grinding of diamond segments bottom surface, the existing most adopts grinding equipment to process, but contains stickness material in the diamond segments of some models, and at the grinding diamond segments in-process, stickness material adheres on the wheel face of emery wheel, can influence the cutting ability of emery wheel after the adhesion thing accumulation. The method for solving the problem at present is to adopt a wear-resistant scraping block to contact with a grinding wheel, and when the grinding wheel rotates, the wear-resistant scraping block forces the adhered object to fall off, but the method has the following problems: the emery wheel scrapes the piece with wear-resisting continuous contact, when using for a long time, cause wear-resisting to scrape and produce the clearance between piece and the emery wheel easily to influence the adhesion and get rid of the quality, the emery wheel still leads to the emery wheel easily with wear-resisting scraping piece temperature higher with wear-resisting scraping piece continuous contact friction simultaneously, the damage of emery wheel with wear-resisting scraping piece has been accelerated, and wear-resisting scraping piece scrapes the adhesion and can contact with the adhesion, lead to easily that the adhesion adheres to on wear-resisting scraping piece, thereby influence the clearance quality of wear-resisting scraping piece to the emery wheel. Therefore, the device for removing the adhered substances of the grinding wheel of the diamond tool bit grinding equipment is provided.

Disclosure of Invention

The invention aims to provide a device for removing the adhered objects of a grinding wheel of diamond tool bit grinding equipment, which aims to solve the problems in the background technology.

In order to achieve the purpose, the invention provides the following technical scheme: a grinding wheel adhesive removing device of diamond tool bit grinding equipment comprises a grinding wheel main body, a grinding wheel shaft is fixed at the center of the rear side of the grinding wheel main body, the rear end of the grinding wheel shaft is fixed with the output end of the driving device, a grinding wheel cover is movably sleeved on the outer wall of the grinding wheel shaft, a mounting frame is fixed at the top of the rear side of the grinding wheel cover, a bearing block is fixed at the right end of the front side of the grinding wheel cover, and the rear side of the bearing block is provided with a grinding wheel adhesive removing piece which comprises an intermittent component arranged on a grinding wheel shaft, the top of the intermittent component is movably abutted with a top rod, the top of the top rod is movably penetrated through the right side of the mounting frame up and down and is fixedly connected with a top plate, the top of the top plate is fixed with a balancing weight, the left side of the bottom of the top plate is fixed with a connecting rod, and an elastic telescopic rod is fixed at the bottom of the connecting rod, and a wear-resistant scraping block attached to the top of the grinding wheel main body is detachably fixed at the bottom of the elastic telescopic rod.

Further, an L-shaped support frame is fixed on the right side of the top of the mounting frame, the top of the ejector rod penetrates through the L-shaped support frame from top to bottom, a first spring is sleeved on the outer wall of the ejector rod and located between the L-shaped support frame and the mounting frame, an anti-adhesion mechanism is arranged at the top of the L-shaped support frame, the wear-resistant scraping block is located on the left side of the grinding wheel cover, and an anti-adhesion plate is arranged on the left side of the wear-resistant scraping block.

Further, intermittent type subassembly is including fixed cover establishing the pinion at the emery wheel axle outer wall, the meshing of pinion right side has the gear wheel, and the fixed installation axle that is provided with of gear wheel centre of a circle department, and install the axle front end and pass through bearing and grinding wheel cover rear side outer wall swing joint, and the fixed cover in position of installation axle outer wall and being in gear wheel front side is equipped with the rim plate, rim plate circumference outer wall is provided with incomplete tooth section, the rim plate right side is provided with the connecting gear with incomplete tooth section meshing, and connects the gear centre of a circle department and be fixed with the axis body, and the axis body front end passes through the bearing and accepts a rear side right-hand member swing joint, and the fixed cover in position that the axis body outer wall just is in the connecting gear rear is equipped with the cam that corresponds with the ejector pin, the ejector pin bottom is passed through ball and cam slip butt.

Further, the anti-adhesion mechanism comprises a contact gear which is movably arranged at the top of the L-shaped support frame through a support and a shaft body, teeth meshed with the contact gear are evenly arranged on the outer wall of the left side of the ejector rod from top to bottom, a roller body is coaxially connected to the front side of the contact gear, a rope body is wound on the roller body, a support frame which is L-shaped is fixed on the left side of the top of the support frame, a T-shaped sliding block matched with the support frame is arranged on the outer wall of the support frame, facing the outer wall of one side of the support frame, of the support frame in a sliding mode through a transverse T-shaped sliding groove, the other end of the rope body penetrates through the right end of the support frame and is fixed to the right side of the T-shaped sliding block, a second spring is sleeved on the outer wall of the rope body, a mounting plate is fixed to the bottom of the T-shaped sliding block, and a scraping piece processing piece matched with a wear-resistant scraping piece is fixed to the right side of the mounting plate.

Further, scrape a processing piece including fixing the processing mechanism on mounting panel right side, the last trigger piece that is provided with of processing mechanism, processing mechanism is including fixing on mounting panel right side and right side for hollow casing, casing left side activity is pegged graft there is the hose, and the casing left side is fixed with the shunt tubes, hose right-hand member and shunt tubes intercommunication, the shunt tubes right-hand member evenly is provided with the nozzle that is linked together, and the hose left end runs through the mounting panel and is connected with the liquid supply device output through the pipeline, and supplies the liquid supply device to fix at the carriage top.

Furthermore, a movable rod with a T-shaped vertical section is movably inserted in the right side of the top of the shell, a cleaning block matched with the anti-adhesion plate is fixed at the bottom of the right side of the movable rod, the top of the movable rod is movably abutted to the bottom of the contact disc through a ball, the rear side of the contact disc is eccentrically connected with the output end of the driving motor, the driving motor is fixed on a support at the top of the shell, and a reset spring is sleeved at the top of the outer wall of the movable rod.

Compared with the prior art, the invention has the beneficial effects that:

when the grinding wheel shaft drives the grinding wheel main body to rotate for working, the ejector rod drives the top plate to enable the connecting rod to drive the elastic telescopic rod and the wear-resistant scraping block to downwards contact with the grinding wheel to realize intermittent cleaning operation on the grinding wheel main body, so that on one hand, the abrasion of the wear-resistant scraping block is reduced, the service life of the wear-resistant scraping block is prolonged, on the other hand, the heat generated by continuous contact friction between the wear-resistant scraping block and the grinding wheel main body is reduced, the service life of the wear-resistant scraping block is further prolonged, and simultaneously, the rope body is synchronously wound and unwound by the roller body in the intermittent rotation process, when the abrasion-resistant scraping block reaches the highest point upwards, the abrasion-resistant scraping block and the scraping block processing piece are in a corresponding state, the movable rod drives the cleaning block and is matched with cleaning liquid sprayed from a nozzle at the position of the flow dividing pipe to clean adhered objects on the wear-resistant scraping block, so as to ensure the subsequent cleaning quality of the abrasion-resistant scraping block to the grinding wheel main body and avoid the secondary adhesion of the outer wall of the grinding wheel main body.

Drawings

FIG. 1 is a front view of the structure of the present invention;

FIG. 2 is a schematic top view of the intermittent assembly configuration of the present invention;

FIG. 3 is a schematic view of the anti-adhesion mechanism of the present invention;

FIG. 4 is a sectional view of the structure of the processing mechanism of the present invention.

In the figure: 1. a grinding wheel main body; 2. a grinding wheel spindle; 3. a bearing block; 4. a grinding wheel adhered object removing member; 41. a batch assembly; 411. a pinion gear; 412. a bull gear; 413. a wheel disc; 42. a top rod; 43. an anti-sticking plate; 44. an L-shaped support frame; 45. a top plate; 46. a balancing weight; 47. a connecting rod; 48. an elastic telescopic rod; 49. a wear resistant scraping block; 5. an anti-adhesion mechanism; 51. a contact gear; 52. a roller body; 53. a rope body; 54. a scraping block treatment member; 541. a processing mechanism; 5411. a housing; 5412. a shunt tube; 5413. a movable rod; 5414. contact pads.

The drawings are for illustrative purposes only and are not to be construed as limiting the patent; for the purpose of better illustrating the embodiments, certain features of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.

Detailed Description

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 only a part of the embodiments of the present invention, and not all of the embodiments. 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.

Referring to fig. 1-4, the present invention provides a device for removing an adhered material from a grinding wheel of a diamond tool bit grinding apparatus, in which electrical components are connected to an external power source through wires, the device includes a grinding wheel body 1, a grinding wheel spindle 2 is fixed to a center of a circle of a rear side of the grinding wheel body 1, a rear end of the grinding wheel spindle 2 is fixed to an output end of a driving device, the driving device is a motor widely used in the art, and can be fixed to an external designated position to drive the grinding wheel spindle 2 to rotate the grinding wheel body 1 clockwise, a grinding wheel cover is movably sleeved on an outer wall of the grinding wheel spindle 2, which belongs to a common structure of existing grinding apparatuses, and is not described in detail herein, a front end of the grinding wheel spindle 2 can be movably connected to the grinding wheel cover through a bearing, a mounting frame is fixed to a top of the rear side of the grinding wheel cover, a rear side of the mounting frame can also be fixed to an external designated position, a receiving block 3 is fixed to a front side of the grinding wheel cover, and the rear side of the bearing block 3 is provided with a grinding wheel adhered material removing part 4, the grinding wheel adhered material removing part 4 comprises an intermittent component 41 arranged on a grinding wheel shaft 2, the top of the intermittent component 41 is movably abutted with a push rod 42, the top of the push rod 42 vertically movably penetrates through the right side of the mounting frame and is fixedly connected with a top plate 45, the top of the top plate 45 is fixedly provided with a balancing weight 46, the balancing weight 46 is used for assisting the downward resetting of the top plate 45, the left side of the bottom of the top plate 45 is fixedly provided with a connecting rod 47, the bottom of the connecting rod 47 is fixedly provided with an elastic telescopic rod 48, the elastic telescopic rod 48 is widely applied in the field and is not detailed in detail, the impact force which is downwards given to the grinding wheel main body 1 by the wear-resistant scraping block 49 is reduced, the wear-resistant scraping block 49 is always contacted with the grinding wheel main body 1, the clearance which does not occur during long-term use can not influence the quality of removing the adhered material, the wear-resistant scraping block 49 which is detachably fixed at the bottom of the elastic telescopic rod 48, the wear-resistant scraping block 49 is made of a wear-resistant material, is selected according to actual conditions, and is not described in detail herein, and the front-back length and the like of the wear-resistant scraping block are equal to the front-back length of the grinding wheel main body 1.

Referring to fig. 1, an L-shaped support frame 44 is fixed on the right side of the top of the mounting frame, the top of the ejector rod 42 vertically penetrates through the L-shaped support frame 44, a first spring is sleeved on the outer wall of the ejector rod 42 and located between the L-shaped support frame 44 and the mounting frame, one end of the first spring is fixed with the L-shaped support frame 44, the other end of the first spring is fixed with the mounting frame, an anti-adhesion mechanism 5 is arranged on the top of the L-shaped support frame 44, a wear-resistant scraping block 49 is located on the left side of a grinding wheel cover, and an anti-adhesion plate 43 is arranged on the left side of the wear-resistant scraping block 49 and can be made of polytetrafluoroethylene materials;

referring to fig. 2, the intermittent assembly 41 includes a pinion 411 fixedly secured to an outer wall of the grinding wheel spindle 2, a gearwheel 412 engaged with a right side of the pinion 411, the number of teeth of the outer wall of the gearwheel 412 is three times that of the pinion 411, so that the pinion 411 drives the gearwheel 412 to rotate slowly, a mounting shaft is fixedly disposed at a center of the gearwheel 412, a front end of the mounting shaft is movably connected to an outer wall of a rear side of the grinding wheel cover through a bearing, a wheel disc 413 is fixedly secured to a position of the outer wall of the mounting shaft at a front side of the gearwheel 412, an incomplete tooth section is disposed on a circumferential outer wall of the wheel disc 413, the incomplete tooth section is a plurality of teeth for driving the connecting gear to rotate 90 degrees each time, so that the cam rotates to a time when the nose end faces upward or the nose end faces downward, a connecting gear engaged with the incomplete tooth section is disposed at a right side of the wheel disc 413, a center of the connecting gear is fixedly disposed at the center of the connecting gear, and a front end of the shaft is movably connected to a rear end of the receiving block 3 through a bearing, a cam corresponding to the ejector rod 42 is fixedly sleeved on the outer wall of the shaft body and behind the connecting gear, the cam is used for driving the ejector rod 42 to move, and the bottom of the ejector rod 42 is in sliding abutting contact with the cam through a ball, so that contact wear is reduced;

referring to fig. 3, the anti-adhesion mechanism 5 includes a contact gear 51 movably disposed on the top of an L-shaped support frame 44 through a bracket and a shaft body, the contact gear 51 rotates when the top rod 42 moves up and down, teeth engaged with the contact gear 51 are uniformly disposed on the outer wall of the left side of the top rod 42 from top to bottom for driving the contact gear 51 to rotate, a roller 52 is coaxially connected in front of the contact gear 51, the contact gear 51 rotates to rotate the roller 52, the top rod 42 moves up to wind a rope 53 around the roller 52, the roller 52 is wound with the rope 53, an L-shaped support frame is fixed on the left side of the top of the mounting frame, a matched T-shaped sliding block is slidably disposed on the outer wall of one side of the mounting frame through a transverse T-shaped sliding slot, the rope 53 is conveniently pulled to move, the other end of the rope 53 penetrates through the right end of the support frame and is fixed to the right side of the T-shaped sliding block, a second spring is sleeved on the outer wall of the rope 53 in the T-shaped sliding slot, one end of a spring II is fixed with the T-shaped sliding block, the other end of the spring II is fixed with the inner wall of the right side of the T-shaped sliding groove and is used for assisting the T-shaped sliding block to reset subsequently, an installation plate is fixed at the bottom of the T-shaped sliding block, and a scraping block processing piece 54 matched with the wear-resistant scraping block 49 is fixed on the right side of the installation plate;

referring to fig. 3, the scraping block processing element 54 includes a processing mechanism 541 fixed on the right side of the mounting plate, a trigger 542 is disposed on the processing mechanism 541, the processing mechanism 541 includes a casing 5411 fixed on the right side of the mounting plate and having a hollow right side, the casing 5411 is used for cleaning the wear-resistant scraping block 49, a hose is movably inserted in the left side of the casing 5411 to facilitate the left and right movement of the casing 5411, a shunt tube 5412 is fixed on the left side of the casing 5411, the shunt tube 5412 functions in shunting, the right end of the hose is communicated with the shunt tube 5412, nozzles are uniformly disposed at the right end of the shunt tube 5412 and communicated with each other to improve the cleaning quality and efficiency of the wear-resistant scraping block 49, a pipe may be disposed at the bottom of the casing 5411 to connect with an external collecting device, so as to collect liquid and removed adhered substances during cleaning, and no detailed description is given herein, the liquid supply device is fixed at the top of the support frame and is used for inputting cleaning liquid, and the liquid supply device is widely applied in the field and selected according to actual conditions, and is not further detailed herein;

referring to fig. 4, a movable rod 5413 with a T-shaped vertical cross section is movably inserted in the right side of the top of the housing 5411, a cleaning block matched with the anti-adhesion plate 43 is fixed at the bottom of the right side of the movable rod 5413, the movable rod 5413 drives the cleaning block to clean the anti-adhesion plate 43 up and down, the top of the movable rod 5413 is movably abutted to the bottom of the contact tray 5414 through balls, so that contact wear is reduced, the rear side of the contact tray 5414 is eccentrically connected with the output end of the driving motor, the contact tray 5414 is rotated to drive the movable rod 5413 to reciprocate up and down, the driving motor is fixed on a support at the top of the housing 5411, a return spring is sleeved at the top of the outer wall of the movable rod 5413, one end of the return spring is fixed to the top of the outer wall of the movable rod 5413, and the other end of the return spring is fixed to the top of the housing 5411.

The standard parts used in the invention can be purchased from the market, the special-shaped parts can be customized according to the description of the specification and the accompanying drawings, the specific connection mode of each part adopts conventional means such as bolts, rivets, welding and the like mature in the prior art, the machines, the parts and equipment adopt conventional models in the prior art, and the circuit connection adopts the conventional connection mode in the prior art, so that the detailed description is omitted.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.