251results about "Tight-fitting lid removal" patented technology

The present invention relates to a blood testing machine comprising a loading device, a retrieving device, a batching device, a transfer device, and a testing device. After a blood sample is collected, a blood collection tube and other materials are placed in the loading device. After the loading device loads the sample, the retrieving device clamps the blood collection tube and other materials on the loading device and moves them to a set position in the batching device. The blood in the blood collection tube is sampled by the batching device and the reagents required for the test are added to form a test specimen. The transfer device transfers the test specimen to the testing device for blood testing. Compared with the prior art, the present invention substantially automates the steps of blood testing, including sample transportation, sample reception and processing, on-board testing, and sample storage, greatly improving the accuracy and speed of testing.

The sewage sampling device comprises a bearing seat, a plurality of test bottles and a sampling module, the plurality of test bottles are arranged on the bearing seat at intervals, each test bottle comprises a bottle body and a bottle cap, the bottle cap is rotatably mounted on the bottle body through a rotary pin and used for opening / closing the bottle body, and the bottle cap extends outwards relative to the bottle body and forms a groove plate; the sampling module comprises a manipulator, a wedge edge rod and a suction pipe, the wedge edge rod and the suction pipe are arranged in parallel and are respectively connected to the manipulator, the wedge edge rod vertically extends downwards relative to the suction pipe and forms a pushing part, and the pushing part is matched with the groove plate; when the manipulator simultaneously drives the wedge edge rod and the suction tube to vertically move downwards, the wedge edge rod can push the groove plate through the pushing part so as to drive the bottle cap to open the bottle body; the straw can be inserted into the bottle body in the opened state. Therefore, bending deformation of the suction pipe is effectively avoided, the bottle cap is driven to reset through the rotary pin, automatic closing of the bottle cap after sampling can be achieved, and the lasting sealing performance of a test bottle is guaranteed.

The utility model provides an automatic test paper tank opening and closing mechanism and a rheological station automatic detection device, and relates to the technical field of automatic detection devices. The automatic test paper tank opening and closing mechanism comprises a supporting base, a test paper storage tank, an uncovering clamping jaw and a first linear module, the first linear module is located on one side of the supporting base, the uncovering clamping jaw is slidably installed on the first linear module to be close to or away from the test paper storage tank, and the test paper storage tank comprises a tank body, a cover body and a flexible block arranged in the tank body; the cover body covers the opening of the tank body, the flexible block is provided with a plurality of slots, a piece of test paper is inserted into each slot, and the cover opening clamping jaw can clamp the cover body to open the test paper storage tank or cover the opening of the tank body with the cover body. Before a robot picks up test paper, the test paper storage tank is opened in advance through the uncovering clamping jaw, so that the robot does not need to open the test paper storage tank, the detection efficiency is improved, meanwhile, the dependence of detection items on manpower is reduced, and the labor cost is reduced.

The utility model provides a bottle capable of being used for opening a material storage cavity with a pressing type instant matching cover and an instant matching bottle, and the bottle capable of being used for opening the material storage cavity with the pressing type instant matching cover comprises a bottle body and a bottle opening, a sunken part and an opening part are arranged at the bottom of the bottle body, and the sunken part is a cylindrical cavity formed by sinking the bottom of the bottle body towards the bottle opening direction and used for containing the instantly-matched cover; the opening part at least comprises an opening end face, and the opening end face is formed by protruding the middle of the end, close to the bottle opening, of the concave part in the direction away from the bottle opening and used for being attached to the pressing part of the instantly-matched cover; the bottle opening is formed in the top of the bottle body and used for being connected with an instant matching cover. The instant matching cover connected to the bottle opening of the other bottle is sleeved with the concave portion of one bottle, the opening end face of one bottle is attached to the pressing portion of the instant matching cover connected to the bottle opening of the other bottle, and the opening end face pushes the pressing portion under the action of external force so as to open the storage cavity of the instant matching cover. Opening of the material storage cavity of the instant matching cover is very labor-saving and convenient.

The utility model discloses a cover opening device, which relates to the technical field of automation equipment and comprises a first transmission component, a first connecting frame, a second transmission component, a second connecting frame and a cover opening component, and the first connecting frame is arranged on the first transmission component; the second transmission assembly is arranged on the first connecting frame; the second connecting frame is arranged on the second transmission assembly; the cover opening assembly is arranged on the second connecting frame. According to the technical scheme, the first transmission assembly and the second transmission assembly are matched with each other, double-stroke control is achieved, and it is guaranteed that the uncovering assembly can be accurately connected with a ton barrel cover through segmented movement of the uncovering assembly. The cover opening assembly automatically completes barrel cover opening and transferring after being connected with the ton barrel cover, the whole feeding process can be fully automatically conducted by being in butt joint with upstream equipment and downstream equipment, manual assistance is omitted, the physical labor intensity of workers is reduced, and the overall liquid feeding efficiency is improved.

The utility model discloses a kind of multiple non-matrix automatic cap screwing workstations for cryopreservation tube, including bottom installation component, support component is provided on bottom installation component, support component top end is provided with top installation component, top installation component is provided with outer transmission component, first moving nut, second moving nut are provided on outer transmission component, first moving nut is provided with first moving plate, first moving plate is provided with a plurality of first installation hole, inner screwing transmission component is provided in first installation hole, second moving nut is provided with second moving plate, second moving plate is provided with a plurality of second installation hole, moving guide rail is provided on bottom installation component, feeding moving plate is provided on moving guide rail, feeding moving plate is provided with cryopreservation tube storage component, use this automatic cap screwing workstation, realize the automatic screwing cover and unscrewing cover operation to batch cryopreservation tube, effectively improve the operation efficiency that cover is screwed or unscrewed.

The present application relates to the technical field of sample pretreatment automation, and discloses a system of a full-automatic sampling tube cap screwing and pipetting workstation and a running method thereof.The system comprises a motion point definition module, a cap screwing adaptation identification module, a label scanning module, a pipetting planning and execution module, a cap screwing torque calling module and a real-time torque acquisition module.The system realizes continuous scanning and reliable identification of the cap profile in the motion state through a dynamic coordinate system and key motion points, dynamically calls matched torque parameters to execute cap screwing according to the identification result, and simultaneously acquires real-time torque data.The system synchronously completes sample label information analysis, pipetting path planning and pressure monitoring.The scheme realizes adaptive perception and closed-loop cap screwing control of the cap state, and improves the robustness of cap identification, the consistency of cap screwing action and the reliability of the overall process.

A decapping device may be integrated with an automated biochemical analyzer or biological testing system to aid in sample testing. The exemplary decapper, includes a motor that is operable to lower a latch mechanism to engage with a cap of a sample tube and then raise the latch mechanism to remove the engaged cap. As the latch mechanism is lowered, a retractor portion also descends and causes a set of grippers to extend and grip the sample tube. As the latch mechanism is raised, the set of grippers apply a corresponding pressure to hold the sample tube in place while the cap is removed. Once removed, the cap rests within the latch mechanism and the set of grippers are retracted by the raising retractor. As the latch mechanism returns to its origin position, an ejector arm is operated causing the cap to be ejected from the latch mechanism.

The present invention discloses a method for obtaining the optimal path for a robot arm to open a fuel cap, and relates to the technical field. The present invention comprises the following steps: defining the coordinate systems of the robot arm and the fuel cap; defining the coordinate systems of the intermediate process of the robot arm opening the fuel cap; calculating the joint angle of the robot arm corresponding to the movement of the robot arm; and calculating the optimal path for the robot arm to open a fuel cap. obj The z-axis unit vector of the coordinate system is at O paw_temp Description in coordinate system; find O b The z-axis unit vector in the coordinate system is at O paw_temp The results are described in the coordinate system; based on the results, the process of the robot arm moving from its current position to the end of the fuel cap handle is derived. The present invention uses an algorithm to achieve the optimal path for the robot arm to open the fuel cap using the rotatable jaws on the fixture until the jaws align with the fuel cap handle, allowing the jaws to rotate and unscrew the fuel cap, ensuring that singularities and breakpoints are avoided as much as possible during the movement of the robot arm.

The utility model relates to the technical field of battery production, and discloses a barrel opening device for a battery slurry barrel. The barrel opening device of the battery slurry barrel comprises a barrel opening assembly and an operation arm, wherein the barrel opening assembly comprises a barrel opening sleeve and a barrel opening bulge; the barrel opening sleeve and the barrel opening protrusion are both connected with the operation arm, the operation arm is rotated to drive the barrel opening sleeve and the barrel opening protrusion to rotate at the same time, and the barrel opening sleeve and the barrel opening protrusion are used for opening slurry barrel covers of different structures. The barrel opening device of the battery slurry barrel can be used for opening slurry barrel covers with different shapes more safely and quickly, is more labor-saving, has lower requirements on operators, and does not pollute materials in the slurry barrel.

This invention discloses a miniature canning and conveying device, comprising a conveying assembly, a capping assembly, a cap transfer assembly, a guardrail assembly, a filling assembly, and a sterilization assembly mounted on a substrate. The conveying assembly has an inlet end, an inlet conveying end, an outlet conveying end, and an outlet end, with the inlet and outlet conveying ends conveying in opposite directions. The capping assembly is positioned above the inlet and outlet conveying ends. The cap transfer assembly is positioned between the inlet and outlet conveying ends. The guardrail assembly is laid between the inlet and outlet conveying ends, forming a filling and inoculation station, a sterilization station, and a channel. The filling and sterilization assemblies are respectively positioned at the filling and inoculation stations and the sterilization station. The guardrail assembly includes a bottle pushing component. This invention enables the filling and inoculation of the medicine inside the isolator from outside the isolator, preventing contamination of the internal environment of the isolator and leaks due to manual operation.

The invention discloses a desktop type test tube plug automatic cover turning device which comprises a machine frame, a bracket, a clamping device and a rotary cover turning device are sequentially installed on the machine frame from bottom to top, the clamping device comprises clamping fingers, a clamping air cylinder for controlling the clamping fingers to move oppositely or oppositely is installed in the machine frame, and the rotary cover turning device is installed on the bracket. And the rotary cover turning device comprises a cover turning arm and a rotary oscillating cylinder for controlling the cover turning arm to rotate. According to the invention, the cylinder is used for driving and controlling to clamp and flip the test tube, compared with a traditional mechanical structure or a complex electric adjusting device, the driving is reliable, the parameter adjustment is convenient, and the flip efficiency is improved. The bracket fixes the test tubes, the height of the bracket is adjustable, and opening of test tube covers of different specifications can be achieved. The whole structure is simple, the automation degree of test tube uncovering can be improved, manual operation is reduced, operators are prevented from making contact with reagents, the sample pollution risk is reduced, and the test tube uncovering device is suitable for biological and chemical laboratory scenes and the like.

The utility model discloses a batch uncovering device applied to a single urine discharge test tube group. The batch uncovering device comprises a main shell and a test tube clamping unit, wherein the test tube clamping unit is right opposite to the direction of an outer tube group push-in groove and is arranged in an inner cap body processing cavity; a batch cap screwing unit and an auxiliary cap removing unit; a cap body storage box; a urine test tube set is pushed in along an external tube set pushing-in groove, urine test tubes are clamped in batches through a test tube clamping unit, a second clamping air cylinder pushes forwards to enable a belt-driven cap screwing assembly to make close contact with caps and rotate the caps, the caps completely screwed away from the urine test tubes are subjected to auxiliary pulling away through an auxiliary cap removing unit, and the cap containing box contains the pulled-away caps. Aiming at the current situation of single urination test tube arrangement which is commonly used in clinic, under the condition that an original arrangement mode is kept, a single-row tube set batch uncapping automatic system is arranged, and the integrated action integration of test tube clamping, friction type batch cap screwing, cap body auxiliary pulling-away and cap body containing is achieved, so that the device is closer to the current clinical use habit, and the overall working efficiency of uncapping is improved.

The invention discloses a multipurpose cover opening and closing device for a shielding tank, and relates to the technical field of shielding tank opening, which comprises a rack, a lifting driving mechanism, a lifting frame, a positioning ring, a rotary driving mechanism and a claw head assembly, the lifting driving mechanism is arranged on the rack; the lifting frame is connected with the lifting driving mechanism and is driven by the lifting driving mechanism to do lifting motion; the positioning ring is fixedly connected to the bottom of the lifting frame and is used for radially positioning the shielding tank body; the rotary driving mechanism is mounted on the lifting frame; the claw head assembly comprises a transmission shaft, a switch cover claw head and an elastic pressure applying part; the transmission shaft is in transmission connection with the rotation driving mechanism. The cover opening and closing claw head is connected to the bottom end of the transmission shaft. The elastic pressure applying part is used for providing elastic force tending to move downwards for the switch cover claw head. According to the cover opening and closing device, through cooperation of lifting and rotating motion and stable contact guaranteed by the elastic pressing part, whole-process automation of cover opening and closing operation of the shielding tank is achieved, and operation safety, precision and efficiency are remarkably improved.

The invention relates to the field of automatic operation of dispensing equipment, in particular to a penicillin bottle uncapping method and system for an automatic dispensing machine, and the method comprises the steps: firstly setting a mechanical arm movement XYZ three-dimensional space coordinate system, calibrating a reference coordinate, and setting a slope and an intercept calculation target value in a segmented manner according to the diameter of a bottle body; the bottle body diameter and the bottle body total height of the penicillin bottle are obtained through visual recognition, a compensation value is calculated, the actual in-place coordinate point of the center position of the front-end clamping jaw is corrected, and the mechanical arm pose parameters and the actual in-place coordinate point are input into a mechanical arm control system to control the mechanical arm to execute uncapping operation; the uncovering system comprises a visual identification module, an uncovering mechanism, a mechanical arm control system, a front-end clamping jaw and the like. The technical effects that the position of the mechanical arm can be accurately corrected according to the diameters of different bottle bodies, and precise uncovering operation on the penicillin bottles is achieved are achieved.

The object of the present invention is to provide a novel self-locking clamping device that can maintain engagement in a self-adaptive manner even when the structure is deformed during use, ensuring a stable locked state even when the structure is deformed in a way that conventional fixed pivot structures cannot. [Solution] The present invention includes a first arm, a second arm, a ratchet arc fixed to one of the arms, and a pawl mechanism supported on the other arm via a variable pivot. The variable pivot can move in position in response to elastic deformation of the arm when the pawl mechanism engages with the ratchet arc, achieving self-adaptive engagement. The elastic member constantly biases the pawl mechanism in the ratchet direction, but the pawl mechanism can be released by user operation. This allows for consistent locking performance regardless of structural deformation.

This utility model proposes a retractable juice bottle opener, including an opener body and an adjusting mechanism. The adjusting mechanism includes a first spring, a second spring, a button, and a connecting rod. The inner wall of the opener body has a circular groove; the first spring is disposed on the inner side wall of the opener body; the second spring is disposed on the outer wall of the opener body; the button is disposed at the other end of the second spring; the connecting rod is disposed on the outer wall of the opener body; and multiple slots are equidistantly distributed on the outer wall of the connecting rod. This retractable juice bottle opener, according to an embodiment of this utility model, can prevent situations where the opener cannot be opened due to incompatibility between the opener and the juice bottle model.

The utility model relates to the technical field of medical experiment tools, in particular to an automatic cover opening tool which comprises a lower shell, an upper shell, a battery, a mounting plate, a motor, a connecting rotating shaft, a profiling head, a control circuit board, a cover pushing mechanism, an electric quantity indicator lamp, a charging port, a starting switch, a cover opening button and a cover screwing button. By means of the structural design that the profiling heads are detachable and replaceable, automatic uncapping and uncapping of freezing tubes of various specifications can be achieved by replacing different profiling heads, good compatibility is achieved, product assembling consistency is kept, automatic uncapping and uncapping of a plurality of bottles can be achieved at a time through the arrangement of the multiple profiling heads, and the production efficiency is improved. Meanwhile, manual contact with the cryopreservation tube is avoided, cleanliness and no pollution of the environment in the uncovering process are guaranteed, manual work is reduced, the uncovering efficiency is improved, the experiment efficiency is improved, and good practicability is achieved.

The utility model discloses a multifunctional cap opener for a biological experiment, which is adaptive to opening and closing requirements of an EP tube, a centrifugal tube, a reagent bottle and a PCR (Polymerase Chain Reaction) row tube by integrating a slit, a notch, a gradually-changed groove and an arch-shaped edge structure. The design of the asymmetric tooth-shaped protrusions and the lever is adopted, the operation intensity is remarkably reduced, and the light weight (smaller than 70 g) and the low cost are achieved by combining the hollowed-out part and the ergonomic holding part. The tool is suitable for high-flux experiment scenes.

The utility model discloses a bottle cap screwing manipulator which comprises a bottle cap clamping mechanism and a driving mechanism, the bottle cap clamping mechanism comprises a cap screwing clamp and an opening and closing air cylinder, and the cap screwing clamp is connected with the opening and closing air cylinder; the cap screwing clamp is of a multi-petal type clamp structure, and all petal clamps of the cap screwing clamp are driven by an opening and closing air cylinder to be opened or closed. A clamping block is arranged along the inner side face of each clamp, and the cap screwing clamp makes contact with a bottle cap through the clamping blocks. The driving mechanism is connected with the opening and closing air cylinder through a transmission shaft so as to drive the opening and closing air cylinder and the cap screwing clamp to rotate. In this way, the opening and closing air cylinder drives the cap screwing clamp to be opened or closed, the bottle cap is clamped in the closing process, the servo motor drives the cap screwing clamp to rotate after the bottle cap is clamped, and the purpose of screwing or unscrewing the bottle cap is achieved. The structure is simpler, gear transmission is not needed, the number of parts is smaller, and cost is lower; and the clamping blocks are matched with the cap screwing clamps, so that the bottle cap can be clamped in a surrounding and wrapping posture, and the bottle cap can be clamped more tightly and cannot be damaged.

A push-pull type labor-saving efficient bottle opener only comprises two parts, namely an outer push hook and an inner pull hook, and is suitable for unscrewing, screwing or removing most bottle caps of various sizes and types. The bottle opener is efficient and labor-saving, does not damage a bottle cap, and is simple in structure and durable.

The invention discloses a cryopreservation tube cap opener which comprises a base, the upper surface of the base is used for containing a cryopreservation box, the cryopreservation box is used for containing a plurality of cryopreservation tubes arranged in a rectangular array, cap screwing devices in one-to-one correspondence with the positions of the cryopreservation tubes are arranged above the base, and all the cap screwing devices operate independently. The technical scheme provided by the invention has the beneficial effects that each rotating motor is independently connected with the driving device capable of driving the rotating motor to move up and down, and the up and down movement of each bit / clamping jaw assembly can be independent, so that the opening and closing operation of tube covers of different parts of cryopreservation tubes in the same cryopreservation box can be realized; and more diversified use scenes are met.

The application relates to the field of aerospace technology, and particularly discloses an automatic device for quantitatively pouring liquid, which comprises a rack, a turnover mechanism and an uncapping mechanism. The turnover mechanism comprises a driving device and a clamp assembly. The clamp assembly is rotatably arranged on the rack through a rotating shaft. The driving device is fixed on the rack, and the output end of the driving device is connected with the clamp assembly. The uncapping mechanism is arranged on the rack and located above the clamp assembly. A hopper is slidably arranged on the rack. The application has the advantages of overcoming the defects of the prior art, i.e. the accuracy of pouring liquid can be improved, the safety of workers can be ensured, and the labor cost can be reduced to a certain extent.

The utility model discloses a five-hole uncapping clamping and lifting linkage structure which is characterized in that a five-hole uncapping tightening motor base is fixed on the upper portion of a five-hole uncapping right side supporting plate, an uncapping pipe holding motor is fixed on the five-hole uncapping tightening motor base, and a five-hole uncapping pipe holding lifting base is arranged below the five-hole uncapping tightening motor base; a five-hole uncapping holding pipe lifting seat is fixed on a sliding block, the sliding block is in sliding fit with a linear sliding rail, an uncapping holding pipe motor is connected with an uncapping holding pipe motor lead screw, the uncapping holding pipe motor lead screw is connected with the five-hole uncapping holding pipe lifting seat through a round standard nut, and the two sides of the five-hole uncapping holding pipe lifting seat are fixed to one end of a five-hole uncapping holding pipe inclined supporting arm. One end of the five-hole uncapping symmetrical rotating arm is fixed with a five-hole uncapping eccentric rotating arm shaft on the five-hole uncapping eccentric rotating arm front assembly, and the other end of the five-hole uncapping symmetrical rotating arm is connected with the other end of the five-hole uncapping pipe holding inclined supporting arm. Movement in two different directions can be achieved through one driving motor, cost is low, and efficiency is high.

The utility model provides a device for rotating a barrel cover, which comprises a rod body, a rotating shaft, a rotating shaft, a rotating shaft and a rotating shaft, and is characterized in that a strip-shaped through hole is formed in the rod body along the length direction of the rod body; the bolt is mounted on the inner side of the strip-shaped through hole; the clamping blocks are in threaded connection with the bolts, the number of the bolts is two, each bolt is correspondingly provided with one clamping block, and a clamping position for clamping the barrel cover is formed between the two clamping blocks; and the adjusting assembly is used for adjusting the distance between the two clamping blocks. The barrel cover clamping device has the advantages that compared with manual rotation of the barrel cover, the rotating torque is increased through the rod body, the barrel cover is convenient to open, the working efficiency is improved, the clamping blocks are movably arranged to be suitable for clamping barrel covers with different diameters, and the application range of the device is widened.

An apparatus, system and method for a compact box opener suitable for opening a compact box containing therein a reticle. The embodiments provide: a flowthrough deck; a plurality of location guides on the flowthrough deck suitable to mate with guides on a base of the compact box; a plurality of vacuum ports on the plurality of location guides capable of retaining the guides on the base; a lid opening arm having a suction cup at an end thereof, wherein the suction cup is capable of gripping a lid of the compact box and opening the lid by an actuation of the lid opening arm; rotary-actuated arms that are raised for initial actuation within the drawer above a rim of the compact box and which, when actuated, rotate jaws at an end of each of the rotary-actuated arms inward over the rim and downward to a height below a lower plane of the reticle; and at least one angular notch in each of the jaws suitable to grip a radiused edge of the reticle. Once the radiused edge of the reticle is gripped by the inward movement of the jaws, the jaws are raised while the reticle remains gripped until the reticle is at a second height fully above the rim.

This invention relates to the design of an automated lid-opening device, specifically an intelligent lid-opening device for powder paper drums with iron hoops. It can automatically feed the paper drums with iron hoops, automatically rotate and position them, automatically recycle the iron hoops, and open the lids of the paper drums with iron hoops. The device includes a machine base (1), on which a feeding track (2) is provided. The machine base (1) is provided with a feeding station (3), an iron hoop removal station (4), and a lid-opening station (5). The feeding track (2) passes through the feeding station (3), the iron hoop removal station (4), and the lid-opening station (5) in sequence. The iron hoop removal station (4) includes a frame (6), on which slides (7) are provided on both sides. A pneumatic pusher (8) slides with the slides (7). The pneumatic pusher (8) is provided with grippers (9). A lifting and rotating mechanism is provided below the frame (6). The device also includes a limiting gripper module (18) for limiting the paper drum.

According to the pipe cap removing device, work of a clamping driving assembly and work of a rotating driving assembly do not interfere with each other, and the pipe cap removing device comprises the clamping driving assembly and a rotating driving assembly, the clamping assembly comprises a main shaft, a thrust bearing, a shifting fork connecting rod connected to the thrust bearing, two shifting forks rotationally connected to the main shaft respectively, and two guide rails arranged in a sliding mode relative to the main shaft in the radial direction of the main shaft, and the two guide rails are connected with fingers and clamping jaw cap kicking supports respectively; the thrust bearing is in transmission connection with a motor shaft of the driving motor and can be driven by the motor shaft to move in the axial direction of the main shaft, the shifting forks are in transmission connection with the shifting fork connecting rods and the guide rails, and when the thrust bearing moves in the axial direction of the main shaft, the two shifting forks rotate in the opposite directions so as to drive the two guide rails to be relatively close to or away from each other; and the rotary driving assembly comprises a rotary base and a power mechanism, and the power mechanism is in transmission connection with the main shaft.

The utility model discloses a needle cap clamping structure for uncapping of a dispensing suction-injection device, which comprises a suction-injection device body, a slide way and a cover plate arranged on one side of the slide way, a needle cap body is arranged on the bottom side of the suction-injection device body, the needle cap clamping structure further comprises a clamping mechanism, the clamping mechanism comprises an air cylinder arranged in the cover plate, and the air cylinder is arranged on the upper portion of the cover plate. Two exhaust throttle valves are arranged on the outer wall of one side of the air cylinder, two rotating shafts are arranged on the inner wall of the air cylinder, a first clamping jaw and a second clamping jaw are arranged on the circumferential outer walls of the two rotating shafts respectively, and the needle cap body is located between the first clamping jaw and the second clamping jaw; and the limiting mechanism is matched with the needle cap body. Belongs to the technical field of suction injectors, can stably clamp when a needle cap body is uncapped, prevents pollution caused by falling, and is standard and convenient to operate and higher in working efficiency.