32results about How to "Limit reached" patented technology

The invention discloses an enjoyable English contest equipment for English language teaching. The enjoyable English contest equipment comprises a chassis and wireless responders, a plurality of placement grooves for placing the wireless responders are arranged at the upper end of the chassis, a vertical rod is fixedly connected at the upper end of the chassis, a fixing disc is fixedly connected atthe upper end of the vertical rod, a rotatable rotating disc is arranged at the inner part of the fixing disc, a limiting mechanism is arranged on the side wall of the rotating disc, an abutting mechanism for controlling the rotating disc to rotate is arranged at the upper end of the fixing disc, a support plate is fixedly connected at the upper end of the rotating disc, and a lifting groove is arranged on the side wall of the support plate. The structure design is reasonable, the height of a display screen is adjusted according to the requirement of a user, and the direction of the display screen can also be adjusted, so that a student can better watch and can race to answer the question through the wireless responder, and the fun of the English contest is improved, so that the learningeffect is improved, and the enjoyable English contest equipment is favorable for a teacher to implement the operation of English language teaching.

The invention discloses a shielding door locking device comprising a lock base, a locking mechanism, an electromagnetic unlocking mechanism, a manual unlocking mechanism and a signal triggering mechanism which are arranged on the lock base, wherein the shielding door locking device supplies enough unlocking force through the electrification of the electromagnetic unlocking mechanism to force a lock hook to automatically unlock, and furthermore, a lock pin fixed on a sliding door obtains degree of freedom on the horizontal direction and the aim of releasing the sliding door according to the requirement of an instruction is achieved; after an electromagnet loses power instructively, the unlocking force of the electromagnet disappears, a stroke lever of the electromagnet resets under the dual actions of a spring and the gravity, and the lock hook returns to a horizontal working position under the action of an offsetting spring, therefore, a limiting pin of the sliding door is limited; in addition, the manual unlocking mechanism can be used for realizing manual unlocking and door opening actions in an emergent operation mode and is simple in structure, easy to realize and safe and reliable.

The invention provides a halogen antimony-free resin composition, as well as prepreg, laminate and printed circuit board using the same. The halogen antimony-free resin composition is prepared from the following components in parts by weight: 25-70 parts of flame-retardant epoxy resin, 10-40 parts of non-flame-retardant epoxy resin, 20-60 parts of a compound curing agent and 0.05-1.0 part of a curing accelerant, wherein the flame-retardant epoxy resin is a composition comprising phosphorus containing epoxy resin, brominated epoxy resin and nitrogen containing epoxy resin. The compound curing agent is further compounded by combining the flame-retardant epoxy resin and non-flame-retardant epoxy resin, so that the phosphorus-bromine-nitrogen synergistic flame-retardant effect can be achieved;and excellent flame retardance is given to a CEM-1 copper cladded laminate, and the technical bottleneck that the halogen antimony synergistic flame-retardant system in a traditional halogen CEM-1 copper cladded laminate cannot be substituted is broken through. The halogen antimony-free resin composition has comprehensive performance advantages of high heat resistance, high damp-heat resistance,low water absorption rate and the like.

The invention relates to a domestic glass wiping device with good adjusting convenience and is intended to solve the problem that the existing glass wiping equipment is inconvenient to operate and haspoor glass cleaning thoroughness. The domestic glass wiping device with good adjusting convenience comprises a washing cart; a control panel and a battery are arranged on an upper plate of the washing cart; a control board, a display screen, an indicator light, a motor switch and a limiting switch are arranged on the control panel; the motor switch and the limiting switch are arranged below the display screen. In the invention, a rocker and a support plate are separated, and therefore, the rocker is avoided moving with movement of the support plate. Therefore, operating can be facilitated, the problem that the height issue of a worker causes poor glass cleaning thoroughness can be eliminated. The domestic glass wiping device with good adjusting convenience is reasonable in structural design and convenient to operate, allows actual cleaning to be performed with less time and manpower consumed, and therefore, has very high practical value.

The invention discloses a high-voltage vacuum circuit breaker with a protection function. The high-voltage vacuum circuit breaker comprises a box body, wherein the bottom of the inner cavity of the box body is fixedly connected with a first fixing board; a second fixing board is movably connected in the first fixing board; the top of the second fixing board is fixedly connected with a vacuum circuit breaker body; and the top of the surface of the box body is fixedly connected with a supporting board. The high-voltage vacuum circuit breaker is provided with the box body and the first fixing board to achieve an effect on placing the second fixing board and the vacuum circuit breaker body, an effect on detecting temperature and humidity in the box body is achieved through a temperature sensorand a humidity sensor, an effect on providing energy is achieved through a solar panel and a storage battery, and an effect of the temperature and humidity regulation of the box body is achieved through a connecting pipe and a fan, and an effect on blocking dust is achieved through a static electricity dust screen. By use of the device, the vacuum circuit breaker can be effectively protected so as to bring convenience to people in use.

The invention discloses a sintering device for ceramic resistor production, which comprises an outer box, an inner box for ceramic resistor sintering is fixedly connected in the outer box, a closing door is hinged on the outer box, a sealing part is mounted on the closing door, the sealing part comprises an air bag and a sealing block, the sealing block is fixedly connected on the closing door, and the air bag is connected with the sealing block. The sealing door is provided with a groove, the air bag is fixedly connected in the groove, the sealing component is used for sealing the inner box, a fixing component is installed between the outer box and the sealing door, and the fixing component comprises an installation cavity, a lantern ring, a sliding block and a trapezoidal block. And a second spring is compressed, at the moment, a sliding rod can convey air in a sealing cavity into an air bag through an air conveying pipe, and when the air bag is inflated, the size of the air bag is increased, so that the air bag is attached to the side wall of the outer box, and a better sealing effect is achieved on work of the inward ceramic resistor piece.

The invention relates to the technical field of travel trailer compartment production, and discloses travel trailer compartment production coating equipment which comprises an equipment body, a telescopic frame is fixedly mounted on the front face of the equipment body, a spraying frame is fixedly connected to the top of the telescopic frame, and a sliding rod is fixedly mounted on the front face of the equipment body; a supporting plate is slidably connected to the front face of the sliding rod, a supporting sliding rod is fixedly connected to the front face of the supporting plate, and a compartment is fixedly installed at the top of the supporting plate. According to the travel trailer compartment production coating equipment, the spraying box is arranged, a rotating screw rod in a spraying frame rotates in an open groove, under the action of an extension spring, a fixing plate is driven to stabilize a compartment, and meanwhile, a spraying pipe on a sliding rod groove in the bottom of the extension spring sprays the compartment; and therefore, the effect of spraying the whole carriage is achieved.

The invention discloses a composite rotating shaft mechanism. The composite rotating shaft mechanism comprises a face shell, a bottom shell, a liquid crystal assembly, a limit rotating shaft, a fixedsupport, a reinforced shaft, and screws; according to one end of the novel composite rotating shaft mechanism, a routine rotating shaft is fixedly arranged on the liquid crystal assembly and the faceshell, and the other end is provided with a composite rotating shaft structure; the reinforced shaft is adopted for cooperation with the fixed support, so that double-shaft stability and reliability are achieved. The composite rotating shaft mechanism is low in cost, is capable of solving a problem in the prior art that cost is relatively high because of adoption of double rotating shafts in a conventional rotating shaft assembling method; different display angles can be achieved through rotating of the liquid crystal assembly by users; the assembling mode is simple; complex assembling requirements of routine rotating shafts are avoided; and product comprehensive competition advantages are improved greatly.

The invention provides a drainage pipeline flow limiting adjusting device. The problems that an adjusting valve installed on a large drainage pipeline is complex in structure, consequently, assembling is not easy, and the manufacturing cost is high are solved. The drainage pipeline flow limiting adjusting device comprises a steel pipe; flange plates are fixedly arranged at the upper end and the lower end of the steel pipe; an annular baffle is arranged in the steel pipe and is perpendicular to the inner wall of the steel pipe; a water flowing hole is formed in the middle portion of the annular baffle; a cone capable of moving up and down is arranged in the water flowing hole; the diameter of the bottom of the cone is equal to the inner diameter of the water flowing hole; a vertical tooth plate is arranged at the bottom of the cone; a sliding way component is arranged on the inner wall of the cone; the tooth plate is inserted in a sliding way clamping plate of the sliding way component in a sliding manner; the sliding way clamping plate is of a frame type plate structure with a front opening; a limiting plate preventing the tooth plate from disengaging is arranged at the front portion of the sliding way clamping plate; a gear engaged with the tooth plate is arranged in the steel pipe; the middle portion of the gear is connected with a transversely-arranged shaft rod component; and a shaft hole is formed in the wall body of the lower portion of the steel pipe, and the other end of the shaft rod component penetrates out of the shaft hole to be connected with a hand wheel.

The invention discloses face recognition equipment convenient to adjust for campus payment, and the equipment comprises face recognition equipment, wherein the rear side of the face recognition equipment is fixedly connected with a first square tube, and the bottom of the surface of the first square tube is movably connected with a second square tube. According to the invention, through the arrangement and cooperation of the face recognition equipment, the first square tube, the second square tube, a lifting mechanism, a servo motor, a screw rod, a screw sleeve, a first limiting block, a fixing mechanism, a fixed block, a fixed plate, a screw, a through hole, an opening, a second limiting block, a clamping groove and a rubber pad, the invention solves the problem that the face recognitionequipment is inconvenient to use due to the fact that the heights of all people are different when conventional campus face recognition equipment is in use, and the equipment has the advantage of being convenient to adjust, and improves the practicability of the face recognition equipment.

The invention discloses a space rod piece structure vibration reduction device. The space rod piece structure vibration reduction device comprises a plurality of particle dampers used for being installed on a space rod piece structure; each particle damper comprises a shell and a plurality of damping particles, wherein a closed cavity is formed in the shell, and the damping particles are arranged in the cavity to form a particle medium contact stress network; when the vibration frequency of the space rod piece structure is smaller than 200Hz, the recovery coefficient of the damping particles ranges from 0.4 to 0.7, and the friction coefficient of the damping particles ranges from 0.05 to 0.3; and when the vibration frequency of the space rod piece structure ranges from 200Hz to 1000Hz, the recovery coefficient of the damping particles ranges from 0.1 to 0.4, and the friction coefficient of the damping particles ranges from 0.3 to 0.55. The invention further discloses a space rod piece structure vibration reduction method. The space rod piece structure vibration reduction device is good in vibration reduction effect and high in pertinence, the space rod piece structure can be rapid and stable, and the obvious vibration reduction effect is achieved in the full-frequency band, especially the high-frequency band.

The invention discloses a textile yarn guide device with improved clamping friction and adjustable clamping force, and belongs to the technical field of textile. The textile yarn guide device comprises a top plate, clamping mechanisms are arranged on the left side and the right side of the lower surface of the top plate, a fixed shell is fixedly connected between the two clamping mechanisms, and a cleaning mechanism and a dust suction mechanism are arranged in the fixed shell. According to the textile yarn guide device provided by the invention, the clamping mechanisms are arranged, two yarns pass through the space between two extrusion rollers and can be clamped by extrusion rollers, the effect of conveniently guiding the straightened yarns is achieved, and the extrusion roller on the lower side can move upwards under the action of a limiting block and a limiting hole; a second spring can contract through self elasticity to pull a pull plate to move upwards, the pull plate drives an arc-shaped plate to move upwards through a sliding rod, the arc-shaped plate drives a contact pin to move upwards to be inserted into a slot, the pull plate is pulled to move downwards to drive the contact pin to be separated from the slot, and a hand wheel is not fixed any more and can be adjusted at will; and meanwhile, the contact pin can be inserted into any slot to achieve a fixing effect.

The pediatric eye medicine dripping device comprises a medicine dripping device body, eye corresponding grooves, a medicine dripping tube, a medicine feeding leather bag, a USB charging port and a lithium battery, the eye corresponding grooves used for making contact with the eyes of a child are formed in the two sides of the lower end face of the medicine dripping device body, and a watching hole used for medicine dripping is formed in the middle of each eye corresponding groove; an inner cavity is formed in the medicine dripping device body, a vertically-arranged medicine dripping pipe is arranged in the position, over the watching hole, of the inner cavity, a visible belt assembly for inducing children to observe is arranged on the position, over the watching hole, of one side of the medicine dripping pipe, and a medicine dripping structure is vertically arranged in a transposition sliding opening. According to the pediatric eye medicine dripping device, a movable picture structure capable of attracting attention of children is arranged according to the situation that the children are active and do not cooperate with each other, when the children pay attention to pictures, medical staff can conveniently apply medicine to the eyes of the children, and the problem that medicine applying to the eyes of the children is affected due to the fact that the children do not cooperate with each other is solved.

The invention provides a lamp group lifting device for a medical lamp inspection machine, including a lifting group and a supporting group. The supporting group includes a support seat fixed at the bottom of the box, a support column installed on the support seat, and a support plate perpendicular to the support column; the lifting group Including the lifter installed on the support plate, the slide bar set in the lifter and the fixing plate fixing the top of the slide bar; the side of the lifter is equipped with a connecting block, the connecting block is equipped with a lamp group support frame, the side of the lifter is connected with the A groove is provided at the connection position of the connecting block, and a boss opposite to the groove is arranged at one end of the connecting block, and the boss is installed in the groove; a front baffle is arranged in front of the box body, and a There is a chute, the chute is provided with a limit stop, and the lifter is connected with the motor. The invention uses the lifter to realize the lifting of the lamp group, which achieves the dual functions of limiting and supporting; the design of the buffer pad reduces the contact force between the lifter and the support plate during the working process, reduces the damage force, and improves the The service life of the device.

The invention provides a halogen antimony-free resin composition, a prepreg using the same, a laminated board and a printed circuit board. The halogen antimony-free resin composition comprises the following components in parts by weight: 25 to 70 parts of flame-retardant epoxy resin, 10 to 40 parts of non-flame-retardant epoxy resin, 20 to 60 parts of a curing agent, and 0.05 to 1.0 part of a curing accelerant; and the flame-retardant epoxy resin comprises a composition of phosphorus-comprising epoxy resin, bromination epoxy resin and nitrogen-comprising epoxy resin. By virtue of the cooperation of the flame-retardant epoxy resin and non-flame-retardant epoxy resin, especially the cooperation of three flame-retardant epoxy resin, a phosphorus-bromine-nitrogen synergistic flame-retardant effect can be achieved, a CEM-1 copper-coated laminated board is good in flame retardant property, the technical bottle neck that the halogen antimony synergistic flame-retardant system in the traditional halogen CEM-1 copper-coated laminated board cannot be replaced is broken through, and the halogen antimony-free resin composition has the advantages of significant comprehensive performance such ashigh heat resistance, high damp heat resistance and the like.

The invention discloses a spray gun self-sealing pipe seat device used in a flue system, which comprises a spray gun pipe seat, and a plug support that is sealed and fixed to the inner wall of the spray gun pipe seat is arranged inside the front end of the spray gun pipe seat, and the plug support The middle part is provided with a through hole for the spray gun to pass through. The side of the plug support near the flue is provided with a plug fixing piece and a plug cover plate. The plug fixing piece is fixed on the plug support. One end of the cover plate is fixed with the plug fixing part through the rotating shaft with spring, the plug cover plate can rotate around the rotating shaft, and the other end of the plug cover plate is sealed and covered on the through hole; There is a washer support that is sealed and fastened to its inner wall, and the middle part of the washer support is provided with a multi-stage sealing washer, and the middle part of the sealing washer is provided with a hole for the spray gun to pass through; the rear end of the spray gun pipe seat is provided with a pipe seat internal thread. The pipe seat of the spray gun of the present invention is provided with three-stage sealing, the overall structure is simple, safe and efficient, and the sealing of the pipe seat is realized to prevent smoke from flowing out.

The invention belongs to the technical field of welding and assembling of nucleus pulposus forceps, and particularly relates to a nucleus pulposus forcep assembling and welding tool and a machining process. The nucleus pulposus forcep assembling and welding tool comprises an assembling tool and further comprises nucleus pulposus forceps placed at the upper end of the surface of the assembling tool and a forcep head arranged at the right end of the nucleus pulposus forceps, and a nucleus pulposus forcep containing groove is formed in the left end of the surface of the assembling tool; and a positioning groove is formed in the upper end of the surface of the containing groove, a handle limiting block is arranged at the left end of the surface of the containing groove, a protective shell limiting groove is formed in the upper end of the surface of the assembly tool, and a catheter limiting groove is formed in the right end of the protective shell limiting groove. According to the nucleus pulposus forcep assembling and welding tool, handles are in contact with the outer wall of the handle limiting block, so that the included angle between the handles is 25 degrees; and the handles have a space which is delayed by 2 degrees, so that the bite force of the forcep head is increased, the use effect of the nucleus pulposus forceps is improved, the service life of the nucleus pulposus forceps is prolonged, the assembly consistency of the nucleus pulposus forceps is improved, and the product percent of pass is increased.

The invention relates to the technical field of rubber processing, and discloses a device for stripping the insulating protective layer of a flame-retardant rubber-sheathed cable, which includes a mounting bracket, and motors are fixedly connected to both sides of the upper end of the mounting bracket, and the output end of the motor is set There is a screw rod, the shaft of the screw rod is threaded with a threaded block, and the side of the threaded block away from the mounting bracket is fixedly connected with a guide rod. The insulation protective layer stripping device for the flame-retardant rubber-sheathed cable drives the first slider to slide reciprocally along the three slide rails through the first slide rail, and drives the gear bar to move synchronously with it, and the gear bar drives the ring gear to rotate to drive the clip The iris-holding mechanism and the iris-cutting mechanism are gradually closed, and the clamping block first abuts against the cable, clamps the cable, and at the same time limits the cable to the center of the gear ring, and then the gear ring continues to rotate, and the cutting blade of the iris-cutting mechanism The insulation layer of the cable is cut to achieve the effect of limiting the cable and making the stripping more accurate.

The invention provides a halogen-containing antimony-free resin composition, a prepreg, a laminate and a printed circuit board using the same. The halogen-containing antimony-free resin composition includes the following components by weight: 25-70 parts by weight Flame-retardant epoxy resin, 10-40 parts by weight of non-flame-retardant epoxy resin, 20-60 parts by weight of curing agent, 0.05-1.0 parts by weight of curing accelerator; the flame-retardant epoxy resin includes phosphorus-containing epoxy resin Composition of resin, brominated epoxy resin and nitrogen-containing epoxy resin. The combination of flame retardant epoxy resin and non-flame retardant epoxy resin, especially the combination of three flame retardant epoxy resins, can achieve the synergistic flame retardant effect of phosphorus-bromine-nitrogen, endowing CEM‑1 with With good flame retardancy, the copper-clad laminate breaks the technical bottleneck that cannot be replaced by the halogen-antimony synergistic flame-retardant system in the traditional halogenated CEM‑1 copper-clad laminate, and also has outstanding features such as high heat resistance and high humidity resistance Comprehensive performance advantages.

The invention discloses a shielding door locking device comprising a lock base, a locking mechanism, an electromagnetic unlocking mechanism, a manual unlocking mechanism and a signal triggering mechanism which are arranged on the lock base, wherein the shielding door locking device supplies enough unlocking force through the electrification of the electromagnetic unlocking mechanism to force a lock hook to automatically unlock, and furthermore, a lock pin fixed on a sliding door obtains degree of freedom on the horizontal direction and the aim of releasing the sliding door according to the requirement of an instruction is achieved; after an electromagnet loses power instructively, the unlocking force of the electromagnet disappears, a stroke lever of the electromagnet resets under the dual actions of a spring and the gravity, and the lock hook returns to a horizontal working position under the action of an offsetting spring, therefore, a limiting pin of the sliding door is limited; in addition, the manual unlocking mechanism can be used for realizing manual unlocking and door opening actions in an emergent operation mode and is simple in structure, easy to realize and safe and reliable.

The invention relates to the technical field of electric tools, and discloses a wireless control charging type electric tool. The tool comprises a shell, a rotating chuck and a drill bit, wherein a first motor is fixedly arranged on the right inner side wall of the shell, a first rotating shaft is rotatably arranged at an output end of the first motor, the end, away from the first motor, of the first rotating shaft is rotatably connected to the tail end of the rotating chuck, and a fixed bent plate is fixedly connected to the left inner side wall of the shell. According to the tool, the rechargeable electric tool can be remotely locked, so that children are prevented from hurting themselves due to playing of the electric tool when guardians are not around.

The invention discloses an automatic rattan winding machine for a wooden handle of a rattan chair. The automatic rattan winding machine comprises a platform, a storage box, supporting plates, a punching assembly, a rattan winding assembly, a clamping assembly, a gluing assembly, a conveying belt and a discharging assembly. The storage box, the supporting plates, the punching assembly, the rattan winding assembly, the clamping assembly, the gluing assembly, the conveying belt and the discharging assembly are all arranged on the platform; the platform is provided with a supporting table for supporting the storage box, and the supporting table is provided with a limiting assembly matched with the storage box; the gluing assembly is arranged at one side of the supporting table, the conveying belt is arranged at one side of the gluing assembly, one end of the conveying belt is connected with one end of the gluing assembly in a clamped manner, the discharging assembly is arranged at the other end of the conveying belt, and the two supporting plates are symmetrically arranged at the two sides of the conveying belt; and sliding grooves allowing the punching assembly and the rattan windingassembly to slide are formed in the two supporting plates, and the bottom of the clamping assembly is connected with the tops of the two supporting plates. Limiting, clamping, punching and gluing of the wooden handle are achieved; and one end of a rattan is inserted into a punched hole of the wooden handle, automatic rattan winding is carried out, the rattan is cut off and inserted into the otherhole of the wooden handle, a discharging process is carried out, and glue recovering is carried out.

The invention relates to the technical field of garment manufacturing, and discloses a device for automatically performing limitation and collection during sweater interior cleaning. The device comprises a shell; a sleeve frame is movably connected to the interior of the shell; a vent hole is formed in the sleeve frame; a fixed block is fixedly connected to the lower end of the sleeve frame; a through pipe is fixedly connected to the left end of the vent hole; and the upper end of the through pipe is movably connected with power fan blades. A movable block moves rightwards, pressure is applied to a compression spring, the compression spring is internally stressed and compressed, elastic potential energy is internally gathered, and preparation is made for resetting of the movable block; meanwhile, when the movable block moves rightwards, a connecting block is driven to move rightwards together, a clamping block is pushed to be matched with the fixed block, and the lower end of a sweater on the outer surface of the sleeve frame is limited and fixed, so that the situation that the surface of the sweater is difficult to clean due to the fact that the sweater is blown and gathered together due to too large wind power is prevented, and the effect of limiting the sweater to facilitate cleaning is achieved.

The invention discloses a positioning and commissioning device for a ball bearing being stuck, and particularly relates to the field of bearings. The device comprises a suspended grip type bearing supporting and fixing mechanism; a two-way supporting type bearing limiting and fixing mechanism is fixedly mounted on one side of the suspended grip type bearing supporting and fixing mechanism; the end, close to the two-way supporting type bearing limiting and fixing mechanism, of the suspended grip type bearing supporting and fixing mechanism is connected with a rotary type manual ball rapid commissioning mechanism in a clamped mode; and the rotary type manual ball rapid commissioning mechanism is rotationally connected to one end of the suspended grip type bearing supporting and fixing mechanism. By arranging the suspended grip type bearing supporting and fixing mechanism and the two-way supporting type bearing limiting and fixing mechanism, the inner ring of the bearing is connected to the outer walls of convex bearing inner ring limiting and clamping semicircular blocks in an inserted mode, and through the convex surfaces of the convex bearing inner ring limiting and clamping semicircular blocks, the limiting and clamping effects are achieved, so that the convenience and the stability of bearing fixing and commissioning are relatively improved.

The invention discloses a cover plate assembly and a washing machine, and belongs to the field of household appliances. The cover plate assembly comprises a base and a cover body rotationally connected with the base; the cover plate assembly further comprises a rotating shaft and a shielding cover; the rotating shaft is arranged on the cover body and the base in a penetrating mode; the shielding cover is detachably connected with the base; and the shielding cover can axially limit the rotating shaft and shield the rotating shaft. The washing machine comprises the cover plate assembly. The rotating shaft penetrates through the cover body and the base, so that the length and strength of the rotating shaft are ensured, and the service life of the cover body is prolonged; the shielding cover is adopted to axially limit the rotating shaft and shield the rotating shaft, so that the rotating shaft is prevented from being separated out, and the attractive effect is achieved; and the shielding cover is detachably connected with the base, and the shielding cover is installed after the rotating shaft is installed, so that the purposes of limiting and attractive appearance are achieved.

The invention provides a shaft shoulder positioning top for a grinding machine, and relates to the field of shaft shoulder positioning tops. The grinding machine uses a shaft shoulder to position the top, including a top body and a positioning sleeve. The top body is inserted into the interior of the positioning sleeve. The surface of the top body is sleeved with a bearing, and the surface of the bearing is sleeved with a rotary positioning sleeve. The surface of the rotary positioning sleeve is fixedly connected with the inner wall of the positioning sleeve, and the surface of the top body is provided with a locking sleeve on the left side of the rotary positioning sleeve, and the left side of the locking sleeve is connected to the right side of the top body. Overlapping, the right side of the top body is provided with an active slot. The grinding machine uses the shaft shoulder to locate the top, and the movable motor drives the screw to rotate, so that the screw can realize the effect of tightening and installing the top body on the ordinary grinding machine and the CNC grinding machine. Through the cooperation between the screw and the screw hole, the screw can move to the left. The rod runs through the fixing hole inside the fixing plate to increase the stability of the top machine body installed on the grinding machine.