28results about How to "Good sanding" patented technology

The invention discloses a burr removing device for badminton racket processing, and relates to the technical field of burr removing devices, and the burr removing device comprises a composite mechanism. According to the burr removing device for badminton racket processing, through the design of a composite mechanism, a racket is placed on the fixing mechanism, the outer side of the racket is clamped through the fixing mechanism, so that the effect of fixing an object is achieved, burr removing operation is facilitated, a racket rod is placed in the stabilizing mechanism, and the stabilizing mechanism fixes the racket rod; the polishing mechanism is controlled to ascend and descend through the electric push rod so that the racket can be attached conveniently, the edge removing quality can be improved, the motor drives the center rotating shaft to rotate so as to drive the polishing mechanism to rotate, and therefore the effect of polishing the inner ring of the racket is achieved. And the metal chippings fall into the collecting box from the central groove, so that the effect of collecting the chippings is achieved, impurities are convenient to clean, and the deburring effect is prevented from being influenced.

The invention relates to the technical field of automatic grinding machines, in particular to an automatic grinding device for spherical castings, which comprises a base, and a grinding mechanism and a bottom plate are fixedly mounted on the base; a swinging mechanism is mounted on the bottom plate; a collecting mechanism is mounted on the swinging mechanism in a clamping manner; a rotating mechanism is fixed on the swinging mechanism; a storage mechanism is mounted on the base in a clamping manner; the ball can be clamped and limited through the rotating mechanism, meanwhile, the ball can be driven to rotate, and the grinding mechanism is started to slide in the direction close to the ball and can polish and grind a welding seam of the ball during rotation; sweeps generated in the grinding process can be collected through the collecting mechanism, the swing mechanism drives the ball clamped on the rotating mechanism to move, and the ball grinding effect is better; and the ground balls are taken down, and the machined balls can be stored in a centralized mode through the storage mechanism, so that follow-up ball transportation is facilitated.

The invention belongs to the technical field of polishing and grinding, and discloses a spherical shell workpiece polishing and grinding machine which comprises a supporting plate and further comprises a driving motor, and the driving motor is arranged at the top of the supporting plate through a support. A planet carrier in the planetary gear set is fixedly connected with the top of the supporting plate through a support, and a sun gear in the planet carrier is fixed to an output shaft of the driving motor. Through cooperation of a planetary gear set, under driving of the output shaft of the driving motor, the supporting mechanism and the first polishing mechanism are opposite in rotating direction and different in rotating speed, and therefore a spherical shell workpiece located between the second polishing mechanism and the first polishing mechanism generates friction due to the different rotating speeds of the spherical shell workpiece; and the arranged transmission mechanism can drive the first polishing mechanism to do reciprocating motion in the axial direction of the first polishing mechanism in the movement process, so that the workpiece polishing area is changed, no dead angle is generated, and the good polishing effect is achieved.

The utility model discloses a polishing device for water pump impeller machining, relates to the technical field of polishing device structures, and aims to solve the problems that when an existing polishing device is used for polishing a water pump impeller, the polishing efficiency is low, the water pump impeller cannot be rapidly polished, and meanwhile sundries such as burrs can fly around. A motor is mounted in the mounting box, a placing seat is mounted above the motor, a supporting seat is arranged in the placing seat, a connecting frame is mounted between the supporting seat and the placing seat, a mounting protection frame is mounted above the polishing workbench, and a pushing air cylinder is mounted at one end of the mounting protection frame; a grinding installation box is installed below the pushing air cylinder, an installation groove is formed in the lower end of the grinding installation box, an installation frame is installed in the installation groove, first grinding bristles are installed in the installation frame, and an installation fixing base is installed at the upper end in the grinding installation box. And polishing brush bristles II are mounted below the mounting fixing seat.

The utility model discloses a polishing device for bicycle rim production, including base, be provided with motor on the support plate of base, the transmission shaft of motor is connected with one side of carousel, and carousel is connected with swivel ring through connecting rod, and the first electric telescopic link end of one side of swivel ring is provided with polishing head, and the center disc is provided between swivel ring, and the block body is provided with one side of center disc, and the second electric telescopic link end on the block body is provided with support block, and the clamping groove is seted up in the top end of support block. Support block moves under the action of second electric telescopic link, and the bicycle rim is supported, guarantees the stability of rim position, and the inner wall of polishing head moves under the action of first electric telescopic link and makes the inner wall of polishing head and the outer side of rim close contact, and motor drives swivel ring to rotate through carousel, and then the inner wall of polishing head moves and polishes the outer side of rim, and need not manual operation, and the polishing process is convenient and fast, and saves time and labour, and the polishing effect is good, and satisfies the use requirement of bicycle rim.

The present invention relates to a two-component spraying unsaturated polyester resin putty and a preparation method thereof, belonging to the technical field of unsaturated polyester resin putty, and the preparation method comprises the following steps: S1, using phthalic anhydride, hexylene glycol, triethylene glycol, linoleic acid, propylene glycol, neopentyl glycol, a catalyst and maleic anhydride to make a self-made resin; S2, taking the self-made resin and adding zinc stearate, montmorillonite, precipitated white carbon black, titanium dioxide, accelerator, inhibitor, poly [1-(methoxycarbonylmethyl)ethylene] and styrene to prepare the main ash; S3, preparing a putty finished product. The present invention adds linoleic acid and triethylene glycol to accelerate the surface dryness of the putty; in addition, the present invention also uses zinc stearate, montmorillonite, precipitated white carbon black and titanium dioxide in combination, and synergistically improves the polishability of the unsaturated polyester resin putty. The addition of poly [1-(methoxycarbonylmethyl)ethylene] increases the anti-settling effect of the filler and prolongs the storage period of the finished product.

The utility model discloses an autoclaved aerated concrete slab trimming device, which belongs to the field of trimming devices and comprises a conveying frame, a plurality of conveying rollers are movably mounted in the conveying frame, a concrete block is movably mounted on the conveying frame and positioned on the conveying rollers, and trimming mechanisms are movably mounted on four side surfaces of the concrete block. The trimming mechanism comprises a first connecting plate, a first driving rotating rod, a first driven rotating rod, a first grinding wheel, a first gear motor, a second connecting plate, a second driving rotating rod, a second driven rotating rod, a second grinding wheel and a second gear motor. First grinding wheels on a first driving rotating rod and a first driven rotating rod grind the left side and the right side of a concrete block, a second gear motor is started, and second grinding wheels on a second driving rotating rod and a second driven rotating rod grind the upper face and the lower face of the concrete block, so that the four concrete blocks are convenient to grind, the grinding effect is better, and practicability is higher.

The utility model relates to the field of hub grinding equipment, in particular to automatic hub grinding equipment. The polishing machine comprises a workbench, a polishing mechanical arm, a polishing mechanism frame, a sand stripping device, a product containing device, a control cabinet, the workbench and a protective cover, and a polishing mechanism is installed on the polishing mechanical arm and comprises a polishing support, a polishing motor and a polishing disc; the end, deviating from the end connected with the polishing manipulator, of the polishing support is provided with a linkage mechanism which drives the polishing disc to move in the direction away from a to-be-polished product after the polishing disc makes contact with the to-be-polished product on the product containing device, and the polishing support is further provided with a limiting mechanism which limits the movement distance of the polishing disc driven by the linkage mechanism. After the prior art is improved, through the linkage mechanism and the limiting mechanism on the polishing support, when products of different sizes are polished, the polishing pressure between the polishing disc and the surfaces of the products can be adjusted to achieve the ideal polishing effect, the polishing mechanism and abrasive paper can be automatically replaced, the polishing efficiency is high, and the labor cost is saved.

The invention discloses composite putty for repairing the surface of a steel structural part and a preparation method of the composite putty, and relates to the technical field of coating materials. The invention discloses a preparation method of composite putty for repairing the surface of a steel structural part. The preparation method comprises the following steps: mixing a main agent and a curing agent to obtain putty; the main agent comprises modified unsaturated polyester, an accelerant, fumed silica and filler; the curing agent comprises a peroxide initiator, a plasticizer and a pigment; the novel unsaturated polyester is prepared, the defects of shrinkage deformation and warping of the material caused by curing of the unsaturated polyester are effectively overcome, and the prepared putty has excellent adhesive strength and corrosion resistance when being applied to the surface of a steel structural part.

The mechanical workpiece grinding and polishing device comprises a table top, a rotating disc is arranged on the surface of the table top, a fixing assembly is connected to the surface of the rotating disc, a moving assembly is arranged on one side of the rotating disc, a grinding plate is connected to the surface of the moving assembly, a dust removal assembly is arranged on the other side of the rotating disc, and a dust collection box is arranged on the inner side of the dust removal assembly. When a user uses the polishing device, the polishing plate is connected to the surface of the connecting plate of the moving assembly through the clamping strip and the fixing bolt, the polishing plate can be replaced at any time, the polishing effect is improved, and the fixing assembly located on the surface of the rotating disc enables a limiting plate to fix a mechanical workpiece through an anti-skid pad under the elastic force effect of a spring; and meanwhile, the cleaning brush is matched with the suction opening, so that residual chippings and dust on the surface of the mechanical workpiece can be collected to the inner side of the dust collection box, and the polishing effect of the device is prevented from being affected.

The polishing device for hardware manufacturing particularly relates to the technical field of polishing and comprises a hardware machining frame, a machining groove is formed in the front end of the hardware machining frame, a machining table is fixedly installed at the bottom end in the machining groove, and a polishing device is fixedly installed in the middle of the top end in the hardware machining frame. A lifting air cylinder is fixedly installed above the machining table, a lifting rod is fixedly connected to the lower end of the output end of the lifting air cylinder, a detection component is fixedly connected to the lower end of the lifting rod, a driving shaft is fixedly connected to the lower end of the detection component, a grinding plate is fixedly installed at the lower end of the driving shaft, and the grinding plate is located above the two positioning clamping plates. The hardware polishing device has the hardware fixing effect, the polishing contact force can be automatically detected, then the polishing pressure can be automatically adjusted, and the polishing effect is improved.

The utility model discloses a hydraulic motor crankshaft machining polishing device which comprises a bottom plate, a first fixing frame is fixedly installed on the top of the bottom plate, a lifting assembly is fixedly installed on the top of the first fixing frame, a rotating assembly is fixedly installed on the inner side wall of the lifting assembly, and the bottom end of the rotating assembly is fixedly connected with a clamping assembly. A first cleaning assembly is arranged on one side of the bottom plate, a grinding box is fixedly installed on the top of the bottom plate, and grinding stones are arranged on the inner side wall of the grinding box. According to the grinding equipment for machining the hydraulic motor crankshaft, through the arrangement of the lifting assembly, the rotating assembly, the grinding box, the grinding stone, the clamping assembly and the first cleaning assembly, the crankshaft can be ground in all directions, so that the grinding effect is better, the situation of omission in the grinding process is avoided, and the working efficiency is improved accordingly; and a small amount of chippings can be removed after polishing, so that the surface of the crankshaft is smoother, and the using effect is improved accordingly.

The invention discloses roof pretreatment equipment for waterproof treatment, and relates to the technical field of building construction, the roof pretreatment equipment comprises a controller, a grinding disc, a grinding column, a displacement hole, a back suction assembly, a backflow box, a water supply box, a water supply diversion pipe, a driving tile, a driving block and a wave guide block, a high-frequency back-and-forth rotation mode is adopted, and the driving block alternately stretches out and draws back to push the driving tile to rotate; an intelligent control system can automatically adjust parameters according to real-time detection results, the grinding quality is further improved, the equipment is provided with a water circulation system, cyclic utilization of water flow is achieved, dust generated in the grinding process is wetted and taken away, and dust flying is prevented. The noise in the grinding process is reduced, the flexible material shell absorbs part of vibration, the device is suitable for being used in the environment sensitive to noise, the driving block generates ultrasonic waves through high-frequency vibration, the grinding effect is monitored in real time, and the surface flatness and whether defects such as cracks exist or not are evaluated.

The utility model discloses a steel ball milling structure which comprises an upper millstone and a lower millstone, a planetary gear set is arranged in the upper millstone and connected with a first driving part to drive the upper millstone to rotate, and the planetary gear set comprises a sun gear, a plurality of planetary gears and an outer gear ring. The planet wheels are arranged in the outer gear ring and distributed on the peripheral side of the sun wheel in a surrounding mode to be meshed with the sun wheel in a matched mode, the sun wheel and the planet wheels are arranged to be the same in size and connected with matched grinding assemblies, and matched grooves are formed in the upper grinding disc and the lower grinding disc. The lower millstone is provided with an outer edge and is connected with an adaptive second driving part to drive the lower millstone to rotate relatively below the upper millstone, the design of the steel ball milling structure can further increase the contact surface with the steel balls, the grinding area is increased, and meanwhile, a good grinding effect is achieved.

The present invention relates to the technical field related to grinding devices, and specifically provides a device for grinding inner holes of pipes, comprising: a grinding table, a rectangular pipe and a camera, wherein pipe clamping mechanisms are arranged on both sides of the upper surface of the grinding table, and the rectangular pipe is clamped between the two pipe clamping mechanisms, one end of the grinding table is fixedly connected with an L-shaped frame, and a support platform is fixedly installed at the bottom of the end of the L-shaped frame away from the grinding table, a sliding component is connected to the inner side of the L-shaped frame through a propulsion mechanism, a motor is installed on the upper surface of the sliding component, a rotating shaft is fixedly connected to the output end of the motor, a fixed shaft is fixedly installed at the end of the rotating shaft away from the motor, a cross rod is fixedly installed at the end of the fixed shaft, a ring seat is sleeved on the outer side of the cross rod, and annular grooves are opened inside the two sides of the ring seat. The present invention can grind the inside of a square pipe, and the grinding effect is good and sufficient.

The invention discloses a glass fiber surface treatment machine, and relates to the technical field of glass fiber polishing, the glass fiber surface treatment machine comprises an operation table, a support is fixedly connected to one side of the upper surface of the operation table, a disc is arranged on the support, an annular plate is slidably connected to the side, away from the support, of the upper surface of the operation table, and an extrusion door is rotatably connected into the annular plate; through operation and adjustment of an operator, due to the fact that the grinding device can be more tightly attached to the surfaces of glass fiber pipes of various sizes, the grinding process can be more uniform and meticulous, and the burr and unevenness phenomena are effectively reduced; the glass fiber pipe grinding device can flexibly adapt to glass fiber pipes with different diameters and lengths, tools do not need to be frequently replaced or adjusted, the construction efficiency and flexibility are greatly improved, meanwhile, the operation process is simplified, an operator can master the grinding skill more quickly, and errors and losses caused by improper operation are reduced.

The present invention relates to a handheld weld grinding device and a working method capable of protecting a welding parent material, comprising a frame on which a driving mechanism is fixed, the driving mechanism being connected to a cylindrical tool and capable of driving the tool to work, circular positioning pieces having a diameter greater than that of the tool being provided on both sides of the tool, the circular positioning pieces being capable of rolling along the surface of the welding parent material during grinding, and the residual height of the weld being controlled by the diameter difference between the circular positioning piece and the tool, the grinding device of the present invention can effectively protect the welding parent material, and conveniently control the grinding feed speed, has a good grinding effect, and is suitable for different processing scenarios.

The helicopter empennage rolling bearing polishing device comprises an outer shell, a sliding block and a sliding groove are installed in an inserted mode, the sliding groove is formed in the inner wall of the outer shell, a servo motor is installed at the lower end of the inner wall of the sliding block in an embedded mode, a driving gear is installed at the output end of the servo motor, and the driving gear and the inner wall of the sliding groove are installed in a meshed mode. A first micro electric push rod is installed on the inner wall of the second rotating block in an inserted mode, a push block is installed at one end of the first micro electric push rod, an installation insertion block is installed on the inner wall of the push block in an inserted mode, and one end of the installation insertion block is fixedly connected with an inner grinding block. According to the helicopter empennage rolling bearing grinding device, feeding can be conducted in sequence through the material guide groove, returned materials can be conveyed through the conveying mechanism, continuous operation is conducted, the inner grinding block and the outer grinding block of the device conduct inner ring and outer ring grinding, and the grinding efficiency is improved. And the first micro electric push rod and the second micro electric push rod can drive the inner grinding block and the outer grinding block to be stably adjusted in a telescopic mode, and the grinding effect is better.

The utility model discloses a kind of grinding devices for cable protection pipe, including first rack, the first polishing mechanism includes first cone, first motor and first support frame, the first support frame is set to the right end of the first rack, the upper end of the first support frame is equipped with first sleeve, the first cone is connected in the outside of the first sleeve by bearing, the first motor is set to the right end of the first support frame, the first motor is equipped with first gear across the first support frame, the right end of the first cone is equipped with second gear, the first gear is matched with the second gear, first adjusting polishing mechanism is equipped in the first cone. A kind of grinding device for cable protection pipe provided by the utility model, it is clamped cable protection pipe by first cylinder to push first pressing plate, keep the axis of cable protection pipe consistent with first cone, to guarantee that first grinding knife is stretched out and is evenly polished, guarantee that polishing effect is more ideal.

The invention relates to the technical field of steel polishing, in particular to a bridge steel derusting and polishing device which comprises an outer frame and I-shaped steel and further comprises two sets of rotary clamping mechanisms symmetrically arranged; the working end of the adjusting mechanism is fixedly provided with a plasma generator, the output end of the plasma generator is communicated with a thin guide pipe, the outer side of the thin guide pipe is sleeved with a spirally-arranged electrified coil, and the density of the electrified coil is gradually increased from right to left; the supporting rod is fixedly installed on the plasma generator, and a laser transmitter is fixedly installed at the front end of the supporting rod; and the working end of the visual sensor faces one side of the I-shaped steel. The surface of the I-shaped steel can be polished in all directions, the polishing effect is better, the part with thick rust can be further polished in a reinforced mode, and stubborn rust on the surface of the I-shaped steel can be removed advantageously.

The invention relates to the technical field of automobile data recorder production and processing, and discloses an automobile data recorder lens accurate grinding device which comprises an accurate grinding mechanism, the lower side of the accurate grinding mechanism is fixedly connected with a cleaning mechanism, and the cleaning mechanism is used for cleaning and collecting chippings and dust falling in the grinding process of the accurate grinding mechanism; the accurate grinding mechanism comprises a shell, an upper grinding assembly fixedly connected to the inner wall of the upper portion of the shell, a lower grinding assembly fixedly connected to the inner wall of the lower portion of the shell and a positioning assembly fixedly connected to the inner wall of the middle of the shell, and a main shaft is fixedly connected to the inner bottom of the right end of the shell. According to the lens grinding device, the accurate grinding mechanism and the operation cover are matched with each other, manpower is saved, the grinding efficiency is improved, the grinding device can be better controlled to grind the two faces of a lens needing to be ground to the same degree, the grinding effect is more ideal, and the cleaning mechanism, the bottom box and the dust collection drawer are matched with each other; and in the grinding process, chippings and dust are cleaned and collected.

The utility model relates to robot automation polishing technical field discloses a kind of pneumatic radial floating seat, including fixed seat, floating seat, cylinder driving assembly and cone swing mechanism;The fixed seat is connected with mounting base;The floating seat is connected with fixed seat by cone swing mechanism, and can be relative fixed seat and do cone swing;The cylinder driving assembly includes cylinder body seat, multiple plunger cylinder sleeve, the plunger corresponding with the number of plunger cylinder sleeve and cylinder upper cover;The cylinder body seat is fixed on fixed seat, the plunger cylinder sleeve is installed in cylinder body seat, and the plunger is set in plunger cylinder sleeve with clearance fit.This utility model replaces traditional piston cylinder with multiple independent, low-friction plunger cylinder.The clearance fit between plunger and plunger cylinder sleeve and groove design, while guaranteeing basic air tightness, greatly reduce movement resistance, avoid the "creep" and jamming phenomenon of traditional piston cylinder under low pressure.

The utility model relates to the technical field of sheet metal part surface treatment, and provides a sheet metal part end face grinding device which comprises a workbench, a supporting frame is fixed to the side edge of the workbench, a grinding assembly is installed on the supporting frame and comprises a driving piece and a wire drawing abrasive belt, the wire drawing abrasive belt is connected to the outer portion of the driving piece in a sleeved mode, and the driving piece is fixed to the supporting frame. A positioning assembly used for vertically positioning the grinding end of the wire drawing abrasive belt is installed on the workbench, the positioning assembly comprises a positioning vertical plate, a locking piece and a mounting plate, the positioning vertical plate is vertically attached to the inner side of the grinding end of the wire drawing abrasive belt, and the mounting plate is fixed to the workbench; the sheet metal part polishing device has the advantages that sheet metal parts can be automatically polished in batches, the workload of workers can be relieved, the polishing end of the wire drawing abrasive belt can be continuously kept in the vertical state, the vertical end faces of the sheet metal parts can be polished more accurately through the wire drawing abrasive belt, the polishing effect is better, and the polishing quality can be kept consistent.

The utility model relates to the technical field of hardware finish machining mechanisms, and discloses a hardware finish machining mechanism which comprises a structural frame, a machine frame is fixedly arranged on the structural frame in a welding mode, three polishing belt synchronous belt wheels are arranged on the machine frame in a rotating mode, and a polishing belt is arranged outside the polishing belt synchronous belt wheels in a winding mode. The polishing belts are used for polishing hardware parts making contact with the polishing belts during rotation, a driving motor is fixedly arranged on the structural frame, and an output shaft of the driving motor and a rotating shaft of one polishing belt synchronous belt wheel are connected with a driving synchronous belt wheel and a driven synchronous belt wheel through keys correspondingly. The polishing device is good in polishing effect and can be adjusted to polish different inclined planes, splashing metal scraps are absorbed in the polishing process to avoid air pollution, and cleaning is more convenient.

The invention discloses a high-efficiency generator collector ring carbon brush polishing control system, which relates to the field of electric power control, and comprises a live wire L, a null line N, a state display module, a control switching module, a polishing assembly and a stroke assembly, the power supply end of the state display module is connected with the live wire L, the load end and the null line N for displaying the working state of the system; the control switching module and the state display module are arranged in a circuit in parallel, the power supply end is connected with the live wire L, and the load end is connected with the null line N for controlling the state of the stroke assembly; the grinding assembly is connected with the control switching module and used for adjusting the rotating speed of the brush head. The stroke assembly is connected with the control switching module and used for adjusting the reciprocating polishing stroke distance and speed of the brush head. In this way, adjustment can be conducted at any time through the state of the carbon brush in the polishing process, after the polishing position and the radius are determined, the polished carbon brush is a standard part, the perfect radian with the fixed radius can be formed, and the attaching degree of the carbon brush and the collecting ring is guaranteed.

The utility model relates to the field of motor wheels, in particular to automatic grinding equipment for motor wheels. The automatic grinding equipment for the motor wheel comprises the motor wheel. The grinding mechanism is arranged on one side of the motor wheel; the fixing mechanism is arranged on the side, away from the polishing mechanism, of the movable wheel. And a grinding piece is arranged in the grinding mechanism, and the inner side of the grinding piece is matched with the outer side of the rim of the motor wheel, so that the whole outer side surface of the rim can be covered during grinding, and the optimal grinding effect is achieved. According to the automatic grinding equipment for the motor wheel, the grinding mechanism is arranged, the grinding piece in the grinding mechanism can abut against the inner side of the rim of the motor wheel so as to ensure that the whole outer side surface of the rim can be covered with the grinding effect, and the optimal grinding effect is achieved; and under the cooperation of a plurality of lead screws in the fixing mechanism and abutting blocks, the fixing mechanism can abut against the inner side of a wheel shaft of the movable wheel, so that the movable wheel is fixed to the fixing disc, and the stability during grinding is improved.

The invention relates to the technical field of rail wagon metal rubber part polishing, in particular to a conveying positioning line and a rail wagon metal rubber part polishing production line, and discloses the conveying positioning line which drives a tray to move on a guide rail through a chain wheel assembly, the tray runs stably, and when the chain wheel assembly stops running, the tray is driven to move. And when the tray stays near the position of the clamping tool, the clamping tool is used for clamping the material placed above the tray, and positioning of the material is completed. The embodiment of the invention further discloses an implementation mode of the railway wagon metal rubber part polishing production line, the two polishing manipulators are arranged on the two sides of the turnover manipulator correspondingly, materials are firstly polished by the first manipulator and then turned over by the turnover manipulator after polishing is completed, and then the manipulator completing turnover is polished by the second manipulator. Polishing is completed in one-time conveying through the two polishing mechanical arms and the turning-over mechanical arm, and the production efficiency is higher.

The utility model relates to the technical field of plate trimming, and discloses a trimming mechanism for a light solid composite plate, which comprises a clamping frame, a rotating rod and a polishing roller, the rotating rod and the polishing roller are vertically and rotatably mounted on two sides in the clamping frame, and two symmetric polishing blocks are slidably sleeved on the outer ring of the rotating rod. An arc-shaped polishing surface is arranged on the surface of the outer ring of the opposite surface of the polishing block, a sliding sleeve capable of being slidably arranged on the outer ring of the rotating rod in a sleeving mode is fixed to the side edge of the polishing block, and a locking bolt is connected to the surface of the sliding sleeve in a screwed connection mode, penetrates into the sliding sleeve and abuts against the outer surface of the rotating rod. According to the technical scheme, the rotating rod with the outer ring sleeved with the symmetrical grinding blocks is arranged at the front end of the grinding roller, the right-angle positions above and below the side edge of the composite board can be ground and trimmed through the arc-shaped grinding faces on the surfaces of the grinding blocks, and then the plane of the side edge of the composite board is ground and trimmed through the grinding roller. And a good smooth grinding effect can be achieved on the plane and the right-angle side of the side edge of the composite board.