100results about How to "Impact Observation" patented technology

The invention discloses a lamp for a textile workshop. The lamp for the textile workshop comprises a lampshade and a bulb connected to the inner top of the lampshade in a threaded manner. Two first gas cavities are formed in the opposite side walls of the lampshade. The inner wall of the lampshade is provided with a first annular groove. The first gas cavities are internally provided with a drivedevice for cleaning the surface of the bulb. A fixing device for mounting and fixing the bulb is arranged in the first annular groove. Low-boiling point evaporation liquid in a liquid storage cylindergenerates steam when being heated, a second piston is made to move upward, a first piston is made to move upward, so that the inside of the first gas cavity on the left side is at the negative pressure, the inside of the first gas cavity on the right side is at the positive pressure, a first one-way valve and a second one-way valve are opened at the same time, dust on the bulb is cleaned and recycled, a bimetal sheet in a heat absorption box is heated and bent to enable a third piston to move downwards, so that hot gas in the lampshade is sucked d into the heat absorption box, hot gas is discharged through the first one-way valve of the first gas cavity communicating with the heat absorption box, and moisture on the bulb is evaporated.

The invention discloses an angel adjustable laparoscope with a lens anti-fouling function. The angle adjustable laparoscope comprises a laparoscope main rod and a camera mounting ball, an anti-foulingair bag is arranged outside the laparoscope main rod, and the laparoscope main rod is composed of a retractable joint and a fixing joint; a mounting groove is formed in the bottom of the laparoscopemain rod, the camera mounting ball is rotatably embedded in the mounting groove, and an adjusting rod a, an adjusting rod b and an adjusting rod c are mounted on the camera mounting ball. According tothe angle adjustable laparoscope with the lens anti-fouling function, the anti-fouling air bag is mounted and can be inflated to expand through an inflating tube when a patient is subjected to an operation so that the lens can be protected, the situation can be avoided that inner dissolved substances of the patient pollute the lens and accordingly blur the lens, and influence on observation of adoctor can be prevented; a protection buffering bulge bag is arranged outside the anti-fouling air bag and can effectively protect the abdominal cavity of the patient when expanding, and no unnecessary injury caused by excessively large impact can be generated.

The invention relates to a puncture endoscope used for attached observation for puncturing and orientation in percutaneous nephrolithotomy, solving the technical problems of poor puncture accuracy, big amount of bleeding, high operation failure rate and poor safety of the existing appliances used in percutaneous nephrolithotomy. The puncture endoscope comprises a main endoscope body, an image transferring unit, a lighting unit, an ocular unit and a puncture body. The puncture body is composed of a puncture needle and an indwelling catheter. The ocular unit is composed of an ocular cover, an ocular lens and an ocular glass. The image transferring unit is composed of a multi-filament image transferring rod arranged inside a hollow outer tube of the puncture needle. The lighting unit is composed of a light beam collet which can be connected with the main endoscope body, a light beam interface which is arranged on the light beam collet and can be connected with an external light source, a light cone arranged inside the light beam interface, and a light transferring component which can transfer the external light source which passes through the light cone to the imaging surface of the multi-filament image transferring rod. The puncture body is fixedly arranged at the front end of the main endoscope body. The puncture endoscope has the advantages of good visibility during operations, high puncture accuracy, less bleeding, high operation success ratio and high safety and is unnecessary to be charged with water.

The invention provides a geological survey drilling rig, and belongs to the technical field of geological survey tools. The geological survey drilling rig comprises a main drill pipe, a pneumatic impactor and a secondary drill pipe which are arranged in sequence from bottom to top, and an air passage in the secondary drill pipe, the pneumatic impactor and the main drill pipe communicates with an air compressor through an air channel. A fixing rod is arranged on the outer wall of the secondary drill pipe, a drill bit is arranged at the lower end of the main drill pipe, and a dust recovery device is arranged above the fixing rod. The geological survey drilling rig utilizes the air compressor to provide power, compressed air is blown towards the drill bit along the air passage in the secondary drill pipe, the pneumatic impactor and the main drill pipe, and the pneumatic impactor drives the drill bit to drill holes in an impact mode, so that manpower is saved. At the same time, the air compressor is discharged through the air passage, the effects of cooling the drill bit and blowing out dust are achieved, drilling is performed while punching, and the drilling efficiency is improved. The dust generated in the drilling process can be recovered by the dust recovery device, the dust is prevented from floating around and affecting the observation of operators, and the clean working environment and the personal health of the operators are ensured at the same time.

The invention discloses a checking method for the reflected light of an instrument panel of an automobile on front door glass. The method comprises the steps that an eye ellipse is made; tangents of the eye ellipse are made through a point on the mirror surface of a rearview mirror; front door glass acts as a reflecting surface, and reflection lines of all the tangents are made; and when all the reflection lines are not intersected with an indication surface of the instrument panel or all the reflection lines are not intersected with the indication surface of the instrument panel due to the fact that the reflection lines are blocked by a light blocking part, the reflected light of the instrument panel on front door glass does not influence visual lines of a driver for observing the rearview mirror. The invention also provides a manufacturing method for the automobile and the automobile. The aforementioned checking method is simple and easy to operate, and the reflected light of the instrument panel on front door glass can be checked in the design process of the automobile so that optimization can be timely performed in the design process, the situation that the reflected light of the instrument panel on front door glass influences the visual lines of the driver for observing the rearview mirror of the side at night is prevented, driving comfort degree is facilitated for the driver and driving safety is enhanced.

The invention relates to the technical field of ventilation cabinet illumination lamps, in particular to a laboratory ventilation cabinet LED illumination lamp set. The illumination lamp set comprisesa background lamp, a front pillar lamp, a top lamp and a power supply system, wherein an intelligent switch is arranged between the front pillar lamp and the power supply system, an intelligent switch is arranged between the top lamp and the power supply system, infrared transmitters are arranged at two sides of the lower end of a ventilation cabinet body, infrared receivers are arranged at two sides of the lower end of a sliding door, and the intelligent switches, the infrared transmitters and the infrared receivers are electrically connected with a single-chip microcomputer respectively. According to the illumination lamp set, when the infrared receivers receive signals sent by the infrared transmitters, the single-chip microcomputer receives the signals sent by the infrared receivers and controls the corresponding induction switches to turn off the front pillar lamp and the top lamp; in an experiment state, the illumination lamp set cannot perform perpendicular incidence towards the outer side of the cabinet body, so that both eyes of an experimenter are effectively protected, and the situation that light pollution influences observation of an experiment process by the experimenter is avoided; and in a non-experimenter state, only the background lamp in the illumination lamp set works, so that energy is saved.

The invention discloses a formwork construction device for visualized construction of a column. The device comprises a base frame, a formwork unit, a height adjustment mechanism, a discharge head moving unit and a concrete lifting unit; the upper surface of the base frame is fixedly provided with four fixed sleeves distributed in an array, a sliding rod is slidably connected in each fixed sleeve,the tops of the sliding rods are correspondingly connected to the four corners of a top frame, and a concrete lifting unit is installed at the bottom of the top frame; and the height adjustment mechanism is fixedly connected between two crossbars of the bottom frame, and a horizontal part of an L-shaped connecting rod of the height adjustment mechanism is connected to the side face of the top frame. By means of the formwork construction device and method for visualized construction of the column, the corners of a transparent board can be protected, the expandability is high, formworks can be spliced according to different sizes, the good applicability is achieved, the manual labor intensity is low, safety of workers is facilitated, and the construction efficiency is improved.

The invention relates to the field of English training equipment and particularly relates to an English training auxiliary system. The system comprises an installation plate, wherein a winding mechanism is installed in the middle of the front face of the installation plate, projection cloth is installed on the winding mechanism, a stabilizing plate is fixedly connected to the lower end of the projection cloth, and connecting plates are fixedly connected to the two sides of the lower end of the stabilizing plate; sliding plates are vertically and fixedly connected to the back faces of the connecting plates, the upper ends of the sliding plates penetrate through and are slidably connected into the mounting plate, and a driving mechanism is mounted at the lower end of one side of the front face of the mounting plate and connected with the winding mechanism. The system is advantaged in that the cleaning mechanism and the driving mechanism are arranged on the mounting plate, a servo motor of the driving mechanism is used for driving a third gear to rotate in the using process, the third gear is used for rotating a second gear of the cleaning mechanism and driving a cleaning roller to rotate, and foreign matter such as dust on projection cloth is brushed away through the rotating cleaning roller; manual cleaning by workers is not needed, and convenience is achieved.

The invention discloses an image generation demonstration device for teaching, and the device comprises a housing and a plurality of electronic display screens which is cooperatively nested in the housing. The housing comprises a pedestal and a fixed cover disposed at the upper end of the pedestal. The other end of the fixed cover is of a hollow structure with one opened end, and the interior of the fixed cover is provided with an accommodation cavity, wherein one side end face is provided with a transparent glass layer. The upper and lower end faces of the accommodation cavity are respectively provided with a plurality of insertion strips which are installed along the long axis of the fixed cover. The electronic display screen comprises a transparent display screen which is cooperatively nested in the accommodation cavity, and a control panel which is connected with a side edge of the transparent display screen. The control panel is provided with a plurality of image output control keys and a color control key. The device is mainly used in the teaching process of trigonometric functions, displays the corresponding function images on the transparent display screen through the input of the control panel, and then enables the transparent display screen to be inserted into the accommodation cavity. Moreover, a plurality of transparent display screens can be inserted for the comparison of images and the movement of the images and for bringing convenience to students for full understanding.

The invention discloses security equipment based on a 5G communication base station, and the equipment comprises a monitor, a pedestal, a holder, a bearing rod, and a fixed seat, the bearing rod is welded with the outer surface of the fixed seat, the top end of the bearing rod is welded with the outer surface of the holder, the holder is engaged with the interior of the bottom end of the pedestal,and the lower end of the monitor is welded with the upper surface of the pedestal. The monitor comprises a rain shielding plate, a rain guiding groove and a waterproof shell, the rain shielding plateis connected with the interior of the rain guiding groove in a clamped mode, the waterproof shell is fixedly connected with the two walls of the rain guiding groove in an embedded mode, the rain shielding plate is fixed to the upper end of the waterproof shell and is in clearance fit with the waterproof shell, and the rain shielding plate comprises a baffle, a limiting block, a focal length ring,a camera and a cleaning brush.According to the invention, through structural cooperation, the whole monitor is effectively wrapped, the monitor is prevented from being washed and drenched by typhoonheavy rain for a long time, and the problem that the working condition of the communication base station is difficult to know in time due to the fact that rainwater is attached to the surface of the lens to influence observation of the communication base station in severe weather is solved through swinging of the cleaning brush.

The invention discloses a self-rotating dustproof reversing camera. The camera comprises a lens barrel, wherein a camera body is installed in the lens barrel, a circular lens is rotatably connected inthe lens barrel, a brush plate is fixedly connected to the inner bottom of the lens barrel, a threaded sleeve is fixedly connected to the side wall of the lens, and a screw rod is in threaded connection with the interior of the threaded sleeve; an air inlet groove is formed in the side wall of the lens barrel, a driving device for driving the screw to reciprocate is installed in the air inlet groove, the driving device comprises a piston connected into the air inlet groove in a sealed and sliding mode, and the end, away from the threaded sleeve, of the screw is fixedly connected to the side wall of the piston. According to the camera, the driving device is arranged to drive the screw to move back and forth so as to drive the circular lens to rotate back and forth, and the brush plate andthe lens move relatively, so the lens can be continuously cleaned to keep the cleanliness of the lens, and definition of the collection influence of the camera body is ensured.

The invention provides a detachable antiskid chromatographic column, belonging to the field of biological purification instruments. According to the chromatographic column provided by the invention, the top end of the column body is provided with a U-shaped screen, so that a buffer solution, a sample solution, an eluate and other liquids can conveniently flow down along the wall of the column body, thereby avoiding splashing and influencing the chromatographic effect; and the external surface of the column is provided with an antiskid plastic outer sleeve, so that the column body can be held by hands or fixed to a bracket, and the chromatographic column can not be crashed easily, thereby preventing the clip from leaving scratches on the column body made of glass. The column head and column tail are detachable from the column body; and the chromatographic column can be assembled before chromatography, and can be detached after chromatography, so that the column head, column tail and column body can be respectively cleaned, sterilized and the like. The chromatographic column has the advantages of simple structure and favorable protein purification effect, and is convenient to operate.

The invention discloses an oil collecting box of an integrated stove and a manufacturing method thereof. The oil collecting box comprises a bottom plate, a front plate, a rear plate and a side plate,wherein an observation window and a buzzer are arranged on the outer side of the front plate, a hollow frame is arranged on the inner surface of the front plate, a floating ball is arranged between the hollow frame and the observation window, the center of the rear plate is provided with a groove, a limiting block is arranged on the integrated stove, a liquid level sensor is arranged on a side, close to the front plate, of the groove, a first limiting slot is arranged on the limiting block, a second limiting slot is arranged on the groove, a circuit control device is arranged between the groove and the limiting block, and a sealing device is arranged on the second limiting slot. The manufacturing method comprises the steps of injection molding, circuit control device installation, sealingdevice installation, front plate processing installation, and oil collection box installation test. The manufacturing method disclosed by the invention has simple steps and strong operability, and greatly improves the production efficiency of oil collecting boxes, and the manufactured oil collecting bo can perform automatic alarm to prevent an overflow phenomenon caused by the fact that oil stains are not cleaned in time.

The invention relates to a straightness detection device. The device comprises a test station and a number of light source detectors which are arranged on one end of the test station. The test station comprises a bottom plate, a pair of side plates which are arranged on both sides of the upper end of the bottom plate and a top plate. The pair of side plates are vertically arranged on the upper end of the bottom plate, and are integrated with the bottom plate. A cavity is arranged at the middle part, wherein a device to be detected is placed in the cavity. The top plate comprises a top plate body and a side push plate. A square through hole which is in insertion matching with the pair of side plates is arranged in the middle of the top plate body. A through slot is arranged on the side in the long axis direction, wherein the side push plate is horizontally inserted into the through slot. The width of the through slot is the same as the distance between the pair of side plates. The straightness detection device provided by the invention has the advantages that an object to be detected is horizontally placed between a pair of flat plate horizontally placed; one end is irradiated by the light source detectors; whether light passes through the flat plates is observed on the other end; whether straightness meets a requirement is determined; and the whole device has the advantages of convenient use and high work efficiency.

The invention provides a highway bridge pile foundation drilling device and a using method thereof. The highway bridge pile foundation drilling device comprises an excavator main body and a mechanicalarm, a main body bin is arranged at the end, away from the excavator main body, of the mechanical arm, a telescopic hydraulic cylinder A is arranged at the end, close to the main body bin, of the topof the mechanical arm, a clamping plate is arranged at the output end of the telescopic hydraulic cylinder A, and the end, close to the main body bin, of the clamping plate is fixedly connected withthe main body bin. Through cooperative use of the mechanical arm, the clamping plate, a sliding groove, a fixing screw, a buckle and a drill bit, the inclination angle of the main body bin can be freely adjusted, meanwhile, the rotating stability of the rotating rod is improved through a U-shaped support and a bearing, and the stability of the motor bin and the U-shaped support in the moving process is improved through a sliding block and the sliding groove; and the device can be adjusted to different inclination angles, so that the device can conveniently drill holes in the ground with different gradients, it is guaranteed that the holes of a pile foundation can reach the expected standard, and the quality of subsequent highway bridge construction is guaranteed.

The invention relates to the technical field of traffic signage, in particular to a traffic signage washing device for zones having much dust. The traffic signage washing device comprises a supportingframe, a signage body is fixedly connected to the top of the side face of the supporting frame through a fixing rod, a rotating motor is fixedly connected to the bottom of one side of the supportingframe through a third supporting plate, a threaded rod is fixedly connected to an output shaft of the rotating motor, a threaded sleeve is in threaded connection with the outer surface of the threadedrod, a movable plate is fixedly connected to the top of the threaded sleeve, the side, close to the signage body, of the movable plate is movably connected with a rotating rod through a bearing, theend, far away from the movable plate, of the rotating rod is fixedly connected with a hairbrush, and the side, far away from the rotating rod, of the hairbrush is movably connected with the front faceof the signage body. By means of the traffic signage washing device, the rotating motor is used for driving the threaded rod to rotate to enable the threaded sleeve to drive the movable plate to moveso as to enable the hairbrush to brush and wash the signage body, and dust attached to the signage body is prevented from influencing observation of a driver.

The invention discloses an oral cavity dilator for traditional Chinese medicine pediatric examination. The oral cavity dilator comprises a supporting plate; U-shaped blocks are fixed to the two ends of the supporting plate respectively; two adjusting rods are rotatably connected into each U-shaped block; supporting rods are fixed to the other ends of the two adjusting rods respectively; sliding grooves are formed in the inner sides of the two adjusting rods respectively; sliding blocks are fixed into the corresponding sliding grooves; moving rods are fixed between the sliding blocks; a reset spring fixed in the corresponding sliding groove is arranged on the left side of each sliding block; a connecting plate is fixed between the two moving rods; a threaded rod is rotationally connected between the supporting plate and the connecting plate; one end of the threaded rod penetrates through the connecting plate, and a driving bevel gear is fixed to one end of the threaded rod; a protrudingplate is fixed to the bottom of the connecting plate; a threaded column is rotationally connected to the upper surface of the protruding plate; and a driven bevel gear is fixed to the top of the threaded column. The oral cavity dilator is reasonable in structure, a tongue is limited while the distraction angle is conveniently kept, a doctor can conveniently conduct observation, and meanwhile extra light source irradiation is not needed.

The invention discloses a liquid medicine heating insulation bag and a liquid medicine input device with the same. The liquid medicine heating insulation bag comprises a fully transparent or partiallytransparent heating insulation bag body and an electric heating insulation device, the heating insulation bag body is used for mounting a liquid medicine container with liquid medicines, the electricheating insulation device is used for heating the liquid medicine container, a central containing cavity for mounting the electric heating insulation device and the liquid medicine container is formed in the middle of the heating insulation bag body, the shape of the electric heating insulation device is matched with that of the central containing cavity, the electric heating insulation device isdetachably and adaptively mounted in the central containing cavity, the shape of the liquid medicine container is matched with that of the electric heating insulation device, the liquid medicine container is detachably and adaptively mounted in the electric heating insulation device, the electric heating insulation device adaptively surrounds and clings to the periphery of the liquid medicine container, and the electric heating insulation device is connected with a power supply. The liquid medicine heating insulation bag has the advantages that the liquid medicine heating insulation bag is simple in structure, liquid medicines can be safely, effectively, conveniently and environmentally heated, constant temperature can be kept, and proper temperature of the liquid medicines entering a body is ensured.

The invention discloses a display device for automatically testing PWM zero setting parameters. The display device comprises a display screen main body; the periphery of the display screen main body is sleeved and fixedly connected with a fixing frame; a fixing groove is formed in the fixing frame; the fixing groove is of a frame-shaped structure and is located in the front surface of the displayscreen main body; sliding grooves are formed in the inner walls of the back surfaces of the two sides of the fixing groove; sliding mechanisms are installed on the two sides of the interior of the fixing groove; a fixing plate is installed between the sliding mechanisms jointly; and a sponge strip is installed on the back surface of the fixing plate. The display device has the beneficial effects that the fixing frame is provided with the fixing plate with the sponge strip, and the fixing plate is connected to the fixing frame in a sliding manner by the sliding mechanisms; and during use, the sponge strip slides on the surface of the display screen main body through the fixing plate, and dirt formed by foreign matter such as dust and sweat on the surface of the display screen main body is removed, so that the situation that the dirt formed by the foreign matter such as the dust and the sweat affects observation of workers on the display screen main body is avoided.

The invention discloses a novel non-standard automatic butt welding machine. The machine comprises a first fixing base, an MAM-100 control panel is arranged on the front surface of the first fixing base, a supporting frame is connected to the top of the first fixing base, a fixing rod is connected to the top end of the supporting frame, a fixing frame is connected to the top end of the fixing rod,first hydraulic telescopic rods are connected to the two ends of the fixing frame respectively, a welding gun rack is connected to one end of each first hydraulic telescopic rod, a welding gun head is arranged at the bottom of each welding gun rack, and second fixing bases are arranged at the positions, located below the welding gun heads, of the two sides of the first fixing base respectively. Dual-station welding can be realized, working efficiency can be improved, data of pressure exerted on a to-be-welded part can be detected, it is prevented that since the pressure is too large, the to-be-welded part deforms, and product quality is affected, the bottom of a working table can be also cooled during welding, and meanwhile smoke and ashes generated during welding can be cleared off and prevented from affecting observation of an operator.

The invention relates to an environment-friendly numerical control machine tool with a cleaning function. The environment-friendly numerical control machine tool with the cleaning function comprises amain machine, a main body, a glass pane and a base, and further comprises a recycling mechanism and a cleaning mechanism, wherein the cleaning mechanism comprises a driving assembly, a lifting plate,a rotating shaft, a roller brush, two first bearings, two rotating assemblies and two connecting assemblies, the recycling mechanism comprises a filter screen, a collecting box, a vibration assemblyand a transmission assembly, and the vibration assembly comprises a crankshaft, a rotating block, a knocking plate, a connecting rod and two second bearings. According to the environment-friendly numerical control machine tool with the cleaning function, the function of recycling cooling liquid through the recycling mechanism can be achieved, the cooling liquid is saved, the environment friendliness of the machine tool is improved, the roller brush can be driven to move up and down while rotating through the cleaning mechanism, the function of cleaning the glass pane is achieved, and chippingsare prevented from adhering to the glass pane and affecting observation of a user.

The invention discloses an ultraviolet, visible light and infrared three-in-one unmanned aerial vehicle electric power inspection pod, and relates to the technical field of power inspection equipment.The inspection pod comprises a storage box, an inner cavity is formed in the storage box, a pod body is connected to the interior of the inner cavity, the inner cavity is connected with the pod bodythrough a rotating shaft, a first electric telescopic rod is connected to the top end of the pod body, a stop rod is welded to the interior of the storage box, and one side of the stop rod is connected with the pod body. The pod body is protected by adding a glass cover, so the situation that the pod body cannot be normally used due to influences of scratches caused by branches or other things inthe inspection process on the pod body is avoided; and the pod body is protected through the glass cover, meanwhile, wind and sands are discharged into the pod body, and a groove is formed in the outer portion of the glass cover for movement, so the situation that in the moving process, the glass cover shakes greatly, and consequently observation of the pod body is affected is avoided.

The invention relates to the technical field of high-voltage live display devices. The invention further discloses a high-definition extra-high voltage live display device which includes a panel, an annular groove is formed in the bottom of one side of the front face of the panel. A clamping mechanism is arranged on the other side of the front face of the panel, a fixing rod is arranged in the middle of one side of the panel, a movable sleeve is arranged in the middle of the outer surface of the fixing rod, a connecting block is arranged on one side of the movable sleeve, a protection plate isarranged on the other side of the connecting block, a limiting block is arranged at the top of one side of the protection plate, and a limiting sleeve is arranged at the bottom of one side of the limiting block. For the high-definition extra-high voltage live display device, through mutual cooperation of the protection plate, the limiting block and the limiting sleeve, the indicator lamp on the front face of the panel can be better protected against dust, so that the problem that observation of the indicator lamp is affected due to the fact that a large amount of dust is prone to being accumulated on the surface of the extra-high voltage live display device when the extra-high voltage live display device is not used for a long time is solved, and the dustproof performance of the indicatorlamp is improved.

The invention relates to the technical field of rice wine fermentation and particularly relates to a rice wine fermentation device convenient for observing the rice wine fermentation degree for ruralfamilies. The rice wine fermentation device comprises a fermentation tank, wherein the top of the fermentation tank is connected with a sealing plate, a glutinous rice state observing mechanism is arranged inside the sealing plate, and a rice wine smell deriving and water adding mechanism is arranged at the top of the sealing plate. The rice wine fermentation device provided by the invention is especially suitable for old people in rural families to perform rice wine fermentation. Compared with the existing rice wine fermentation device for rural families, the rice wine fermentation device provided by the invention has the advantages that the state of glutinous rice can be observed without opening the sealing plate, and the smell of the interior of the fermentation tank can be emitted andwater can be added into the interior of the fermentation tank only by adjusting the rice wine smell deriving and water adding mechanism, thereby preventing pollution to the rice wine caused by a largeamount of contact between the air inside the fermentation tank and the outside air, improving the taste of the prepared rice wine, facilitating the continuous fermentation of the rice wine, and reducing the operation of opening the sealing plate so as to prevent the influence on the taste of the rice wine caused by communication between the outside air and the air inside the fermentation tank.

The invention discloses a gang tool lathe with an adjustable protective cover convenient to disassemble in the technical field of gang tool lathes. The gang tool lathe comprises a lathe body, the protective cover is hinged to the outer wall of the right side of the top of the lathe body, a mounting opening is formed in the outer wall of the top of the left side of the protective cover, a glass block is fixedly mounted in an inner cavity of the mounting opening, the outer wall of the bottom of the left side of the protective cover is fixedly connected with a handle, the protective cover comprises an upper cover body hinged to the outer wall of the right side of the top of the lathe body, a lower cover body is arranged on the outer wall of the left side of the upper cover body, and the outerwall of the top of the lower cover body is connected with the outer wall of the left side of the upper cover body through a rotating device. In the device, a rotating rod rotates in an inner cavity of a rear mounting block, so that the lower cover body can rotate on the left side of the upper cover body, the protective cover can be divided into two parts and folded together, the space occupied bythe protective cover is reduced, the height of the protective cover is reduced, and the protective cover is convenient to use through adjustment of the protective cover.