Detection arm for automatic detector

Abstract

The utility model relates to the field of automatic detection, in particular to a detection arm for an automatic detector, which comprises a movable sliding table which at least performs reciprocating rectilinear motion along a horizontal single degree of freedom and is provided with a movable execution end; the upper end part of the lifting mechanism is fixedly connected with the movable execution end of the sliding table, and the movable end can vertically lift relative to the upper end part; the fixed end of the telescopic device is fixedly connected with the movable end of the lifting mechanism, and the telescopic execution end of the telescopic device is fixedly connected with the hollow supporting seat; the middle sleeve is rotatably supported in an inner cavity of the hollow supporting seat through the bearing, the hollow shaft motor is circumferentially fixed with the periphery of the middle sleeve to drive the middle sleeve to rotate, and the middle sleeve is provided with an inner hole. The efficiency and reliability of an automatic detection process are effectively improved, the requirements of high throughput, high precision and low pollution of grain detection are met, and higher detection efficiency and accuracy are provided for grain safety detection.

Description

TECHNICAL FIELD

[0001] The utility model relates to automatic detection field, concretely relates to a detection arm for automatic detector. BACKGROUND

[0002] The grain safety detection mainly includes microorganism pollution detection and chemical pollution detection, focuses on checking pathogenic bacteria such as salmonella, staphylococcus aureus and listeria that can cause food poisoning or infection, pathogenic microorganisms such as norovirus and hepatitis a virus, and harmful microorganism metabolites such as aflatoxin and ochratoxin; at the same time, the detection is carried out on the possible residues of pesticides such as organophosphorus and pyrethroid, veterinary drugs such as antibiotics and hormones, heavy metals such as lead, mercury, cadmium and arsenic, environmental pollutants such as polychlorinated biphenyl and dioxin, and illegal additives such as melamine and sudan red, to prevent the accumulation of these chemical substances in the human body and cause chronic damage.

[0003] For a long time, the grain detection mainly relies on manual operation mode. In the detection process, the centrifugation and oscillation in the sample pretreatment stage, the reagent addition in the extraction and purification stage, and the detection card heating and quantitative analysis in the detection stage, etc. Key links, reagent cover, sample transfer, cap oscillation, centrifugation operation and detection card delivery to heating table and a series of key actions need to be completed manually. Manual operation is not only low in efficiency, but also difficult to meet the increasing demand for grain detection, and is greatly affected by human factors. When the cap is twisted, the torque control is uneven, which can cause reagent leakage, sample pollution or cap damage. When the pipe is moved and the sample is transferred, the positioning accuracy is insufficient, which can cause sample quantity deviation and directly affect the accuracy of the detection result. At the same time, the operator needs to directly contact harmful substances such as fungal toxins and chemical reagents, which poses a health and safety risk.

[0004] With the continuous strictness of the detection standard, the fungal toxin detection process is more and more complex, and different caliber test tubes and reagent bottles need to be switched, and operations such as pipe moving, cap twisting and cap screwing need to be alternately performed. Under the manual operation mode, the switching and alternating process of these is tedious and time-consuming, which seriously restricts the high-throughput advantage of the detection, and it is difficult to adapt to the integrated needs of multiple reagents, multiple containers and multiple steps in the fungal toxin detection. UTILITY MODEL CONTENTS

[0005] The utility model aims at the shortage of prior art, provides a detection arm for automatic detector, which is simple and compact in structure, high in function integration, can realize the continuous execution of cap twisting, pipe moving and sample transfer, and has accurate and coordinated actions without mutual interference, can adapt to containers of different specifications, can complete various operation switching without additional adjustment, effectively improves the efficiency and reliability of the automatic detection process, meets the high-throughput, high-precision and low-pollution needs of grain detection, and provides higher detection efficiency and accuracy for grain safety detection.

[0006] The utility model discloses a detection arm for automatic detection instrument, including,

[0007] Movable slide, at least along horizontal single degree of freedom reciprocating linear motion, set movable execution end;

[0008] Lifting mechanism, its upper end with slide movable execution end fixed link, movable end can be relative to the vertical lifting of upper end portion;

[0009] Telescopic device, its fixed end with lifting mechanism movable end fixed link, its telescopic execution end fixed hollow support seat;

[0010] Intermediate sleeve, hollow shaft motor and bearing, intermediate sleeve is rotatable supported in hollow support seat inner chamber through bearing, hollow shaft motor is with the circumference fixed of intermediate sleeve to drive its rotation, and intermediate sleeve sets the inner hole;

[0011] Core shaft, wear in the inner hole of intermediate sleeve and axial sliding fit, and the upper end is with telescopic execution end axial limit and rotates and cooperate, and the lower section of core shaft sets the driving tooth profile,

[0012] Chuck, containing base and a pair of clamping jaw, base and intermediate sleeve lower end fixed link, and clamping jaw can be relative to base and move towards or away from to open and close, and clamping jaw sets driven tooth profile.

[0013] The first gear and the second gear set up corresponding to each clamping jaw, first gear and second gear are supported on the support shaft and are arranged along the axial direction, first gear is drivingly connected with second gear, wherein first gear is engaged with driven tooth profile, and second gear is engaged with driving tooth profile, so that the axial reciprocating sliding drive of core shaft drives the synchronous opening and closing of clamping jaw.

[0014] First gear and second gear are fixed on the support shaft respectively, and first gear drives the rotation of support shaft, and support shaft drives the rotation of second gear synchronously.

[0015] Alternatively, first gear and second gear constitute a cone pulley, and the cone pulley is sleeved on the support shaft, and first gear directly drives second gear to move synchronously when first gear moves.

[0016] The bottom of the base is provided with an open cavity, the two side walls of the clamping jaw are slidingly fitted with the side walls of the open cavity, a support shaft is arranged corresponding to each clamping jaw, the first gear and the second gear are fixed on the support shaft, a through groove is arranged at the top end of each clamping jaw, the axial projection of the first gear and the driven tooth profile is located in the through groove, and two second gears are arranged on each support shaft and located on the two sides of the first gear.

[0017] The inner side wall of the clamping jaw is provided with an arc-shaped groove for clamping the cylindrical container.

[0018] The movable slide table comprises a first electric slide rail and a second electric slide rail arranged in a cross shape to realize horizontal bidirectional reciprocating linear motion; the first electric slide rail comprises a first base, the first base is axially provided with a first guide groove, the first guide groove is rotationally supported with a first transmission screw rod, the first guide groove is slidingly matched with a first sliding block, the first transmission screw rod penetrates the first sliding block and is threadedly matched with the first sliding block, the first base is fixedly provided with a first servo motor at an end portion, and the output shaft of the first servo motor is in transmission connection with the first transmission screw rod; the second electric slide rail comprises a second base, a second guide groove, a second transmission screw rod, a second sliding block and a second servo motor, and the driving structure is consistent with that of the first electric slide rail, and the second base of the second electric slide rail is fixedly connected with the first sliding block; the upper end portion of the lifting mechanism is fixedly connected with the second sliding block, and the second sliding block forms a movable end of the movable slide table.

[0019] The movable slide table further comprises a third electric slide rail which is arranged in parallel with the first electric slide rail and has the same structure as the first electric slide rail, the third base, the third guide groove, the third transmission screw rod, the third sliding block and the third servo motor of the third electric slide rail are arranged in the same way as the first electric slide rail, and the third sliding block is fixedly connected with the second base of the second electric slide rail.

[0020] The upper end of the mandrel is provided with a connecting seat, the connecting seat is provided with a receiving hole, a limiting disc is arranged in the receiving hole and located at the inner side of the lower end portion of the receiving hole, a flange bushing is rotationally matched in the lower end portion of the receiving hole and the flange of the flange bushing is located at the outer side of the lower end portion of the receiving hole, a connecting bolt penetrates the center holes of the limiting disc and the flange bushing and is threadedly connected with the end portion of the mandrel, and a lateral assembly groove is arranged on the side surface of the connecting seat.

[0021] The upper end of the intermediate sleeve is provided with a counterbore, the counterbore is provided with a compression spring, one end of the compression spring is in abutment with the bottom wall of the counterbore, and the other end of the compression spring is in abutment with the flange bushing.

[0022] The lower segment of the mandrel has a rack segment, and the two sides of the rack segment are provided with driving toothed portions for meshing with the second gear.

[0023] The lifting mechanism is a pneumatic lifting structure, an electric lifting structure or an electro-hydraulic servo lifting structure.

[0024] The beneficial effects of the above scheme are as follows: the movable sliding table, the lifting mechanism and the telescopic device form a three-dimensional feeding system in the horizontal, vertical and axial directions. The horizontal reciprocating linear motion of the movable sliding table can accurately dock the detection multi-divided workstations. The vertical lifting of the lifting mechanism adapts to the different height containers and the work station requirements, and cooperates to realize the fast and accurate displacement between the multi-workstations. The continuous operation can be completed without manual intervention, which directly enhances the automation and high-throughput advantage of the detection process, solves the problems of time-consuming in traditional manual multi-workstation switching and large docking error of the existing detection arm. The intermediate sleeve is rotatably supported in the inner cavity of the hollow supporting seat, the hollow shaft motor drives the independent rotation of the intermediate sleeve, the mandrel is arranged in the inner hole of the intermediate sleeve and axially slides, this structure realizes the decoupling of the rotation and clamping actions, the rotation action is independently controlled by the hollow shaft motor, the cap torque can be accurately output, the reagent leakage, sample pollution or bottle cap damage caused by uneven torque is avoided, the mandrel independently axially slides and transmits power through the driving toothed part, the clamping force is stable and controllable, the thin-walled container is protected from damage, and the rotation cooperation of the upper end of the mandrel and the telescopic execution end further isolates the action interference, greatly improves the operation precision, meets the quantitative accuracy requirement of detection, and eliminates the health risk of manual contact with harmful substances. The driven toothed part of the clamping jaw and the driving toothed part of the mandrel cooperate with the first gear and the second gear arranged along the axial direction on the supporting shaft to form a stable transmission link. When the mandrel axially reciprocates, the clamping jaw is driven to open and close accurately and synchronously through gear meshing, so that the container is prevented from deviating, and the transmission structure and the clamping jaw can be flexibly adapted to test tubes and reagent bottles of different diameters, without the need for additional adjustment or replacement of the chuck to complete clamping of containers of different specifications. Gear meshing transmission can also ensure the opening and closing amplitude and positioning accuracy of the clamping jaw. The utility model integrates horizontal positioning, vertical lifting, axial feeding, rotary driving, clamping execution and other functions as a whole, so that the overall structure is compact, the components have clear division of labor and smooth cooperation, can continuously perform operations such as cap rotation, tube movement and sample transfer, the power transmission path of the modular structure is clear, the operation reliability is high, the maintenance frequency can be reduced, the continuity and stability of the detection process can be ensured, and the needs of high-throughput, high-precision and low-pollution of grain detection can be met, providing efficient technical support for grain safety detection. The utility model is conducive to the automatic upgrading of grain safety detection, ensures grain safety, and avoids the problems of low efficiency, large error and poor safety in traditional manual operation.

[0025] The utility model will be further described in connection with the drawings and specific embodiments. DRAWINGS

[0026] Fig. 1 It is a structural schematic diagram of the utility model;

[0027] Fig. 2 It is a structural schematic diagram of the utility model after removing the cover;

[0028] Fig. 3The schematic view of the arrangement structure in the hollow supporting seat;

[0029] Fig. 4 The enlarged schematic view of the partial structure of the chuck;

[0030] Fig. 5 The schematic view of the sectional structure of the sliding table;

[0031] Fig. 6 The schematic view of the structure of the movable sliding table with the protective plate removed.

[0032] In the drawings, 10 is a first gear, 20 is a second gear, and 30 is a supporting shaft;

[0033] 100 is a movable sliding table, 120 is a first electric sliding rail, 121 is a first base, 122 is a first guide groove, 123 is a first transmission screw rod, 124 is a first sliding block, 125 is a first servo motor, 130 is a second electric sliding rail, 131 is a second base, 132 is a second guide groove, 133 is a second transmission screw rod, 134 is a second sliding block, 135 is a second servo motor,

[0034] 200 is a lifting mechanism, 210 is an upper end, and 220 is a movable end;

[0035] 300 is a telescopic device, 310 is a fixed end, and 320 is a telescopic execution end;

[0036] 400 is a hollow supporting seat, and 410 is an inner cavity;

[0037] 500 is an intermediate sleeve, 520 is a counterbore, and 540 is a compression spring;

[0038] 600 is a hollow shaft motor, and 610 is an output end;

[0039] 700 is a bearing;

[0040] 800 is a mandrel, 810 is a driving toothed portion, 820 is a connecting seat, 821 is a lateral assembly groove, 822 is a containing hole, 830 is a limiting disc, 840 is a flange bushing, 850 is a connecting bolt, and 860 is a rack segment;

[0041] 900 is a chuck, 910 is a base, 911 is an open cavity, 920 is a clamping jaw, 921 is a driven toothed portion, and 922 is a through groove. DETAILED DESCRIPTION

[0042] With reference to the drawings, the specific implementation scheme of the present application will be described in detail.

[0043] With reference to the drawings, the technical solutions in the embodiments of the present application will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present application, but not all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0044] In the description of the present application, it should be understood that the terms center, upper, lower, front, rear, left, right, vertical, horizontal, top, bottom, inner, outer and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In the description of the present application, the terms first, second, etc. are for the purpose of description only, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as first and second can be used to explicitly or implicitly include one or more features. In the description of the present application, unless otherwise specified, the meaning of multiple is two or more. It should be noted that in actual application, due to the limitation of equipment precision or installation error, absolute parallelism or perpendicularity effect is difficult to achieve. In the present application, the description of vertical, parallel or same direction is not an absolute limitation condition, but indicates that the vertical or parallel structure can be achieved within a predetermined error range and achieve the corresponding predetermined effect, so that the technical effect of the limited features can be maximized, and the corresponding technical solution is easy to implement and has high feasibility.

[0045] In the description of the present application, the description of the terms one embodiment, some embodiments, examples, specific examples, or some examples means that the specific features, structures, materials or characteristics described in combination with the embodiment or example are included in at least one embodiment or example of the present application. In the present application, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics can be combined in any one or more embodiments or examples in a suitable manner. In addition, the skilled in the art can combine and combine the different embodiments or examples described in the present application and the features of the different embodiments or examples without contradiction.

[0046] Referring to Figs. 1-6An embodiment of a detection arm for an automatic detection instrument, the embodiment discloses a detection arm for an automatic detection instrument, which can be applied to quantitative automatic detection of food safety, such as heavy metals and mycotoxins, and is especially suitable for reagent bottle cap screwing, centrifugal tube transfer in the sample pretreatment stage, and tube transfer in the quantitative detection stage, such as reagent addition and sample diluent transfer.

[0047] In quantitative automatic detection of mycotoxins, the detection equipment usually comprises a sample extraction oscillation station, a centrifugal purification station, a monitoring card quantitative detection station and the like, and the stations are distributed at intervals.

[0048] The detection arm for the automatic detection instrument comprises a movable sliding table 100, a lifting mechanism 200, a telescopic device 300, a hollow support seat 400, an intermediate sleeve 500, a hollow shaft motor 600, a bearing 700, a mandrel 800, a chuck 900 and a transmission structure. The movable sliding table 100 provides horizontal plane positioning for the whole body, the lifting mechanism 200 is axially fed, the hollow support seat 400 is used as a mounting base of the transmission assembly, the intermediate sleeve 500 and the mandrel 800 realize decoupling transmission of the rotating and clamping actions, the chuck 900 is a terminal execution mechanism, and the whole structure is compact and has high functional integration.

[0049] The movable sliding table 100 can move in a single linear direction in a plane through at least horizontal single-degree-of-freedom reciprocating linear motion, is suitable for the case that the stations are linearly arranged, and is provided with a movable execution end, which can usually be a movable sliding table 100 linear motion component, such as a sliding block, for driving other components to move.

[0050] To more flexibly adapt to the non-linear arrangement of each station, a double electric sliding rail arranged in a cross shape is used as a driving core. Specifically, the movable sliding table 100 includes a first electric sliding rail 120 and a second electric sliding rail 130 arranged in a cross shape to realize horizontal bidirectional reciprocating linear motion. The first electric sliding rail 120 includes a first base 121, a first guide groove 122 axially arranged on the first base 121, a first transmission screw rod 123 rotatably supported in the first guide groove 122, a first sliding block 124 slidingly fitted in the first guide groove 122, and a first servo motor 125 fixedly arranged at an end of the first base 121. The first transmission screw rod 123 penetrates the first sliding block 124 and is threadedly connected with the first sliding block 124. The output shaft of the first servo motor 125 is drivingly connected with the first transmission screw rod 123. The second electric sliding rail 130 includes a second base 131, a second guide groove 132, a second transmission screw rod 133, a second sliding block 134, and a second servo motor 135. The second electric sliding rail 130 has the same driving structure as the first electric sliding rail 120, and the second base 131 is fixedly connected with the first sliding block 124. The upper end 210 of the lifting mechanism 200 is fixedly connected with the second sliding block 134, and the second sliding block 134 forms the movable end of the movable sliding table 100. The first electric sliding rail 120 and the second electric sliding rail 130 are arranged in a cross shape, so that the second sliding block 134 can be displaced at any point in the horizontal plane, and the second sliding block 134 is the movable end of the movable sliding table 100 and is used for carrying the lifting mechanism 200.

[0051] To adapt to the motion accuracy of the multi-station detection device, a third electric sliding rail can be additionally arranged. The movable sliding table 100 further includes a third electric sliding rail which has the same structure as the first electric sliding rail 120 and is arranged in parallel with the first electric sliding rail 120. The third base, the third guide groove, the third transmission screw rod, the third sliding block, and the third servo motor of the third electric sliding rail are arranged in the same way as the first electric sliding rail 120. The third sliding block is fixedly connected with the second base 131 of the second electric sliding rail 130. The third electric sliding rail can be used to extend the horizontal motion stroke or form a redundant drive to improve the stability of the device. In a specific implementation, the third electric sliding rail can be arranged in parallel with the first electric sliding rail 120 inside the top space of the detection device, or can be arranged on the top of the two side walls of the detection device to form two-point support for the second electric sliding rail 130, so that the second electric sliding rail 130 has better support and motion accuracy. The guide groove of each electric sliding rail can be provided with a protective plate, and the sliding block is provided with a through slot for the protective plate.

[0052] The lifting mechanism 200 has its upper end 210 fixedly connected with the movable end of the sliding table, and the movable end 220 can be vertically lifted relative to the upper end 210. The lifting mechanism 200 can be a pneumatic lifting structure, an electric lifting structure, or an electro-hydraulic servo lifting structure. The cylinder part can be used as the movable end 220 and is slidingly fitted with the side wall of the L-shaped support through a track. The front end of the push rod acts on the cross arm of the L-shaped support, and the cross arm is used as the upper end 210 and is fixedly connected with the movable end of the sliding table.

[0053] Electric lifting structure, suitable for high-precision control high scene, speed adjustable; also can be pneumatic lifting structure, suitable for lightweight fast response scene; also can be electro-hydraulic servo lifting structure, including hydraulic cylinder and servo valve.

[0054] Telescopic device 300, its fixed end 310 is connected with the movable end 220 of the lifting mechanism 200, and its telescopic execution end 320 is connected with the hollow supporting seat 400.

[0055] The telescopic device 300 can be selected as an electric push rod to realize axial feeding and drive the hollow supporting seat 400 and subsequent components to move along the axial direction.

[0056] The intermediate sleeve 500, the hollow shaft motor 600 and the bearing 700, the intermediate sleeve 500 is rotatably supported in the inner cavity 410 of the hollow supporting seat 400 through the bearing 700, the hollow shaft motor 600 is fixed circumferentially with the outer periphery of the intermediate sleeve 500 to drive it to rotate, and the intermediate sleeve 500 is provided with an inner hole; the hollow supporting seat 400 can be a cylindrical hollow structure, and the bearings 700 are arranged at the upper and lower ends of the inner cavity 410 respectively, and deep groove ball bearings are selected to rotatably support the intermediate sleeve 500, so as to ensure smooth rotation of the intermediate sleeve 500 without jamming; the peripheral wall of the hollow supporting seat 400 is fixed with the hollow shaft motor 600 to form a stable installation base of the transmission assembly.

[0057] The mandrel 800 is arranged in the inner hole of the intermediate sleeve 500 in axial sliding fit, the upper end is axially limited and rotatably fitted with the telescopic execution end 320, and the lower section of the mandrel 800 is provided with a driving toothed portion 810;

[0058] The peripheral wall of the intermediate sleeve 500 can be fixed circumferentially with the output end 610 of the hollow shaft motor 600 through a flat key, and the hollow shaft motor 600 can directly drive the intermediate sleeve 500 to rotate around its axis after being started.

[0059] The chuck 900 includes a base 910 and a pair of clamping jaws 920, the base 910 is fixedly connected with the lower end of the intermediate sleeve 500, the clamping jaws 920 can move towards or away from the base 910 to open and close, and the clamping jaws 920 are provided with a driven toothed portion 921; a first gear 10 and a second gear 20 are arranged corresponding to each clamping jaw 920, the first gear 10 and the second gear 20 are supported on a supporting shaft 30 and arranged in the axial direction, the first gear 10 is in transmission connection with the second gear 20, the first gear 10 is in meshing with the driven toothed portion 921, and the second gear 20 is in meshing with the driving toothed portion 810, so that the mandrel 800 drives the clamping jaws 920 to open and close synchronously through axial reciprocating sliding. The first gear 10 drives the second gear 20 to rotate through rigid transmission, so that the mandrel 800 drives the clamping jaws 920 to open and close synchronously through axial reciprocating sliding.

[0060] In some embodiments, the first gear 10 and the second gear 20 are fixed on the support shaft 30 respectively, the first gear 10 drives the support shaft 30 to rotate, and the support shaft 30 synchronously drives the second gear 20 to rotate, the rigid linkage of the two gears is realized through the support shaft 30, when the first gear 10 drives the support shaft 30 to rotate, the support shaft 30 can synchronously drive the second gear 20 to rotate without delay; or, the first gear 10 and the second gear 20 constitute a tower wheel, the tower wheel is hollowly sleeved on the support shaft 30, the first gear 10 directly drives the second gear 20 to synchronously move when the first gear 10 moves, the tower wheel is designed in one piece, the transmission link between the two gears is shortened, the first gear 10 can directly drive the second gear 20 to synchronously rotate when the first gear 10 moves, the torque transmission through the support shaft 30 can be omitted, the inertia loss of the intermediate transmission link is reduced, and maintenance is facilitated.

[0061] In some embodiments, in other embodiments, an open cavity 911 is arranged at the bottom of the base 910, the two side walls of the clamping jaw 920 are in sliding fit with the side walls of the open cavity 911, the sliding fit can be T-shaped or dovetail structure, a support shaft 30 is arranged corresponding to each clamping jaw 920, the first gear 10 and the second gear 20 are fixed on the support shaft 30, a through slot 922 is arranged at the top end of each clamping jaw 920, the axial projection of the driven toothed portion 921 is located in the through slot 922, two second gears 20 are arranged on each support shaft 30, and are located on the two sides of the first gear 10 respectively.

[0062] It can be understood that the two side walls of the clamping jaw 920 are in fit with the side walls of the open cavity 911, through the fit, the movement direction of the clamping jaw 920 can be strictly constrained, deviation or inclination of the clamping jaw 920 in the opening and closing process can be avoided, the coaxiality of the clamping of the clamping jaw 920 to the container is ensured, and a basis for accurate alignment of subsequent pipe moving, cap rotating and other operations is provided.

[0063] A support shaft 30 is arranged for each clamping jaw 920, one second gear 20 is arranged on each side of the first gear 10 fixed on the support shaft 30, and the two second gears 20 are in engagement with the driven toothed portion 921 at the top of the clamping jaw 920, forming a transmission structure of double-gear driving single clamping jaw 920. The transmission structure can uniformly disperse the driving force transmitted by the mandrel 800 to the driven toothed portion 921 of the clamping jaw 920 through the two second gears 20, avoid unilateral force concentration of the clamping jaw 920 caused by single-gear driving, improve the force balance of the clamping jaw 920, and enhance the engagement stability of the gear and the toothed portion, and guarantee the reliable execution of the clamping action.

[0064] The through groove 922 at the top end of the clamping jaw 920 can accommodate the axial projection of the first gear 10 and the driven toothed portion 921 into the groove, directly avoiding structural interference between the gear and the main body of the clamping jaw 920, without the need to reserve additional space outside the clamping jaw 920, achieving compact design of the end-of-arm actuator while avoiding gear jamming due to structural interference, ensuring smoothness of the opening and closing action of the clamping jaw 920, and improving the continuity of the automatic detection process. The structure has a large opening and closing distance through the guiding effect of the open cavity 911, balanced transmission of the double gears, and anti-interference design of the through groove 922, which is suitable for the operation requirements of detecting thin-walled containers and containers of various specifications, and provides structural support for reliable implementation of the core function of the detection arm.

[0065] In some embodiments, the inner side wall of the clamping jaw 920 is provided with an arc-shaped groove for adapting to the clamping of cylindrical containers. The arc-shaped groove on the inner side wall of the clamping jaw 920 can be fitted with the outer peripheral contour of the cylindrical container, increasing the contact area between the clamping jaw 920 and the container, reducing local pressure concentration while increasing friction, avoiding slipping and deviation of the container during clamping or transfer, and ensuring stable posture of the container, laying a foundation for precise execution of subsequent cap screwing and container moving operations.

[0066] In some embodiments, the upper end of the mandrel 800 is provided with a connecting seat 820, the connecting seat 820 has a receiving hole 822; a limiting disc 830 is arranged in the receiving hole 822, and the limiting disc 830 is located on the inner side of the lower end of the receiving hole 822; a flange bushing 840 can be rotatably fitted in the lower end of the receiving hole 822, and the flange of the flange bushing 840 is located on the outer side of the lower end of the receiving hole 822; a connecting bolt 850 passes through the center holes of the limiting disc 830 and the flange bushing 840 and is threadedly connected with the end of the mandrel 800; the side surface of the connecting seat 820 is provided with a lateral assembly groove 821.

[0067] It can be understood that the connecting seat 820 at the upper end of the mandrel 800 can form precise axial positioning of the mandrel 800 through the cooperation of the receiving hole 822, the limiting disc 830 and the flange bushing 840. The limiting disc 830 is limited on the inner side of the lower end of the receiving hole 822, and the flange of the flange bushing 840 abuts on the outer side of the lower end of the receiving hole 822. The two cooperate with the connecting bolt 850 to limit the axial movement of the mandrel 800, ensuring that the mandrel 800 only stably rotates in the preset direction, and providing a structural basis for precise transmission of the mandrel 800 driving the opening and closing of the clamping jaw 920.

[0068] The lateral assembly groove 821 on the side of the connecting seat 820 can provide a tool operating space for assembly or maintenance. The overall structure is rigidly connected by connecting bolts 850 and cooperates with the limiting disc 830 and the flange bushing 840, which can ensure the connection strength of the mandrel 800 and the connecting seat 820, and can ensure the stability of the movement of the mandrel 800 and the reliability of the transmission through the cooperation of the rotatable fitting and the axial positioning, thereby providing key support for the precise action of the detection arm end gripper 920.

[0069] To facilitate the installation of the connecting seat, the hollow support seat 400 can be connected to the telescopic execution end 320 through an intermediate support structure, wherein the intermediate support structure includes an upper plate connected to the telescopic execution end 320, and the upper plate is connected to the hollow support seat 400 through a plurality of columns, gaps are provided between the columns, and a plurality of columns are surrounded by a shell.

[0070] In some embodiments, the upper end of the intermediate sleeve 500 is provided with a counterbore 520, and a compression spring 540 is arranged in the counterbore 520. One end of the compression spring 540 abuts against the bottom wall of the counterbore 520, and the other end abuts against the flange bushing 840.

[0071] It can be understood that the compression spring 540 in the counterbore 520 at the upper end of the intermediate sleeve 500 can continuously apply an elastic pushing force to the flange bushing 840 by abutting against the bottom wall of the counterbore 520 and the flange bushing 840 at both ends, thereby pushing the flange bushing 840 to tightly fit the relevant fitting components of the mandrel 800, eliminating the gap between the transmission, such as gear meshing, avoiding the idle stroke caused by the gap during transmission, and ensuring that the axial sliding of the mandrel 800 can be accurately transmitted to the gripper 920, thereby ensuring the synchronicity and precision of the opening and closing action of the gripper 920 and preventing the gripper 920 from deviating from the clamping position due to the transmission idle stroke.

[0072] Meanwhile, the reverse elastic force provided by the compression spring 540 acts on the mandrel 800 through the flange bushing 840, so that the mandrel 800 always has a pre-tightening trend in the direction of clamping the gripper 920, thereby allowing the gripper 920 to maintain a stable clamping trend. Even in the case of slight loosening trend of the mandrel 800, load fluctuation trend or vibration environment, the pre-tightening force of the compression spring 540 can maintain the clamping state of the gripper 920 on the container, thereby avoiding the container from slipping or falling off. The continuous and precise clamping requirement of the telescopic device 300 can be reduced. Even if the telescopic device 300 does not apply clamping force, reliable clamping can still be achieved through the elastic force of the compression spring 540, thereby simplifying the design of the transmission structure and reducing energy consumption. At the same time, when the transmission components or other components are slightly worn, the elastic force of the compression spring 540 can maintain the close fit of the components, thereby avoiding the expansion of the wear gap and causing the clamping force to decrease, prolonging the service life of the overall structure and reducing the maintenance frequency.

[0073] In some embodiments, the lower section of the mandrel 800 has a rack section 860, both sides of which are provided with driving toothed portions 810 for engaging with the second gear 20.

[0074] The rack section 860 at the lower end of the mandrel 800 is engaged with the second gear 20 through the engagement teeth provided on both sides, which can increase the engagement contact area between the mandrel 800 and the first gear 10, so that the driving force generated by the axial sliding of the mandrel 800 is evenly transmitted to the first gear 10 through the engagement teeth on both sides, avoiding the force concentration of the first gear 10 caused by the traditional unilateral engagement, reducing the local wear of the tooth surface of the first gear 10, and preventing the first gear 10 from appearing to be deflected due to unilateral force, thereby ensuring the stability of the transmission process and avoiding the transmission jamming or tooth surface damage caused by uneven force. The engagement transmission between the rack section 860 and the first gear 10 has a fixed transmission ratio, which can accurately convert the axial linear motion of the mandrel 800 into the rotational motion of the first gear 10, and the mandrel 800 can drive the first gear 10 to rotate by a fixed angle every time it slides by a fixed distance, thereby enabling the clamping jaw 920 to obtain a precise opening and closing amplitude. Even if the mandrel 800 has a slight radial deviation due to assembly or use, the engagement teeth on both sides can ensure effective engagement with the first gear 10, maintain the continuity of the transmission, avoid the risk of disengagement caused by the deviation of the mandrel 800 when engaged unilaterally, and further ensure the reliability of the action of the clamping jaw 920, thereby providing stable transmission support for the precise execution of the clamping operation at the end of the detection arm.

[0075] With the above scheme, the detection arm for automatic detection instrument disclosed in the embodiment can be mainly applied to quantitative automatic detection process of aflatoxin, ochratoxin and the like, and is suitable for high-precision operation scenes such as tube transfer, cap screwing and cap twisting. The detection arm is designed by modular integration, realizes precise operation in horizontal, vertical and axial three-dimensional space and rotation-clamping action cooperation, and during operation, the detection arm of the embodiment is composed of a movable sliding table 100, a lifting mechanism 200, an extension device 300, a hollow support seat 400, an intermediate sleeve 500, a hollow shaft motor 600, a bearing 700, a mandrel 800, a chuck 900 and a transmission structure and the like. The movable sliding table 100 provides horizontal reference positioning, the lifting mechanism 200 constitutes a three-dimensional space feeding unit, the hollow support seat 400 is installed as a transmission assembly base body, the intermediate sleeve 500 and the mandrel 800 realize decoupling transmission of rotation and clamping action, the chuck 900 is a terminal execution mechanism, and the overall structure is compact and has high functional integration. Taking continuous operation of aflatoxin quantitative detection as an example, the movable sliding table 100 is started, the first servo motor 125 drives the first sliding block 124 to slide along the X direction, the second servo motor 135 drives the second sliding block 134 to slide along the Y direction, the chuck 900 is moved to the position directly above the extraction bottle, and the chuck 900 stops moving after accurate alignment with the extraction bottle; the lifting mechanism 200 is started, drives the chuck 900 to vertically descend until the neck of the extraction bottle enters the arc-shaped groove range of the clamping jaw 920, and the lifting mechanism 200 stops descending; the extension device 300 is started, drives the mandrel 800 to slide along the axial direction, the driving toothed part 810 of the mandrel 800 drives the second gear 20 to rotate, the second gear 20 synchronously drives the first gear 10 to rotate through the support shaft 30, and then drives the clamping jaw 920 to move towards each other to clamp the extraction bottle; the hollow shaft motor 600 is started, drives the intermediate sleeve 500 to synchronously rotate with the chuck 900 and the extraction bottle, so as to loosen the cap, the extension device 300 drives the mandrel 800 to reversely slide, drives the cap to rise and separate from the bottle mouth, the cap screwing operation is completed, the liquid injection machine is waited for liquid injection, after the liquid injection is completed, the cap loosening operation is performed, the cap screwing operation opposite to the cap loosening operation is performed, the movable sliding table 100 drives the chuck 900 to move to the position directly above the centrifugal tube, the lifting mechanism 200 drives the chuck 900 to vertically descend, and the clamping jaw 920 clamps the test tube; the movable sliding table 100 drives the chuck 900 to move to the position above the oscillation station, the test tube after being tightly capped is put into vibration by the lifting mechanism, after the transfer is completed, the extension device 300 drives the mandrel 800 to reversely slide, the clamping jaw 920 loosens the clamped test tube, the lifting mechanism 200 drives the chuck 900 to adjust the height, the transfer operation is completed, the lifting mechanism 200 is started, drives the chuck 900 to rise to the initial height; the movable sliding table 100 is started, drives the detection arm to move to the standby station as a whole, each component returns to the initial state, and the next operation instruction is waited for.

[0076] The embodiment can meet the precise alignment requirement of tube moving and cap rotating, avoid the error of manual operation, the decoupling transmission design of the intermediate sleeve 500 and the mandrel 800 avoids the mutual interference of rotating and clamping actions, ensures the controllable cap torque and clamping force, reduces the risk of equipment operation failure, integrates the horizontal movement, vertical lifting, axial extension, rotation and clamping functions, the overall structure is small, is suitable for the narrow space inside the detection equipment, and simplifies the overall structure of the equipment. The utility model, compact structure, high function integration, can realize the continuous execution of cap rotating, tube moving, sample transferring and other operations, the action is precise and coordinated and there is no mutual interference, can be suitable for different specifications of containers, can complete various operation switching without additional adjustment, effectively improves the efficiency and reliability of the automatic detection process, meets the high-throughput, high-precision and low-pollution requirement of grain detection, provides higher detection efficiency and accuracy for grain safety detection.

[0077] The above only describes the preferred embodiments of the utility model, and is not used for limiting the utility model, obviously, the person skilled in the art can make various modifications and changes to the utility model without departing from the spirit and scope of the utility model. In this way, if these modifications and changes of the utility model belong to the scope of the utility model claims and equivalent technology, then the utility model also intends to include these modifications and changes.

Claims

1. A detection arm for an automatic inspection machine, characterized in that, The utility model provides a kind of movable slide table (100), at least along horizontal single degree of freedom reciprocating linear motion, set movable execution end; Lifting mechanism (200), its upper end (210) is fixedly connected with the movable execution end of slide table, and movable end (220) can be vertically lifted relative to the upper end (210); Telescopic device (300), its fixed end (310) is fixedly connected with the movable end (220) of lifting mechanism, and its telescopic execution end (320) is fixedly connected with hollow support seat (400); Intermediate sleeve (500), hollow shaft motor (600) and bearing (700), intermediate sleeve (500) is rotatably supported in the inner cavity (410) of hollow support seat by bearing (700), hollow shaft motor (600) is circumferentially fixed with the outer periphery of intermediate sleeve (500) to drive it to rotate, and intermediate sleeve (500) is provided with an inner hole; Core shaft (800), which is axially slidingly fitted in the inner hole of intermediate sleeve (500), is axially limited and rotationally fitted with telescopic execution end (320) on the upper end, and the lower section of core shaft (800) is provided with a driving toothed portion (810); Chuck (900), including base (910) and a pair of clamping jaws (920), base (910) is fixedly connected with the lower end of intermediate sleeve (500), and clamping jaw (920) can move towards or away from base (910) to open and close, and clamping jaw (920) is provided with a driven toothed portion (921); First gear (10) and second gear (20) are arranged corresponding to each clamping jaw (920), the first gear (10) and the second gear (20) are supported on the support shaft (30) and arranged in the axial direction, the first gear (10) is in transmission connection with the second gear (20), wherein the first gear (10) is engaged with the driven toothed portion (921), and the second gear (20) is engaged with the driving toothed portion (810), so that the core shaft (800) is axially reciprocatingly driven to drive the clamping jaw (920) to open and close synchronously. The first gear (10) and the second gear (20) are respectively fixed on the support shaft (30), the first gear (10) drives the support shaft (30) to rotate, and the support shaft (30) synchronously drives the second gear (20) to rotate;Or, the first gear (10) and the second gear (20) form a tower wheel, the tower wheel is sleeved on the support shaft (30), and the first gear (10) directly drives the second gear (20) to move synchronously when the first gear (10) moves.

2. The probe arm for an automatic inspection machine of claim 1, wherein: The bottom of the base (910) is provided with an open cavity (911), the two side walls of the clamping jaw (920) are slidingly fitted with the side walls of the open cavity (911), the support shaft (30) is arranged corresponding to each clamping jaw (920), the first gear (10) and the second gear (20) are fixedly arranged on the support shaft (30), the top end of each clamping jaw (920) is provided with a through slot (922), the axial projection of the first gear (10) and the driven toothed portion (921) is located in the through slot (922), and two second gears (20) are arranged on each support shaft (30), and are located on the two sides of the first gear (10).

3. The probe arm for an automated inspection machine of claim 1, wherein: The inner side wall of the clamping jaw (920) is provided with an arc-shaped groove for adapting the clamping of the columnar container.

4. The probe arm for an automatic inspection machine of claim 1, wherein: ​ 5. The probe arm for an automatic inspection machine of claim 1, wherein: The movable sliding table (100) comprises a first electric sliding rail (120) and a second electric sliding rail (130) arranged in a cross shape to realize horizontal bidirectional reciprocating linear motion; the first electric sliding rail (120) comprises a first base (121) provided with a first guide groove (122) in the axial direction, a first transmission lead screw (123) rotatably supported in the first guide groove (122), and a first sliding block (124) slidably fitted in the first guide groove (122); the first transmission lead screw (123) penetrates the first sliding block (124) and is threadedly connected with the first sliding block (124); a first servo motor (125) is fixedly arranged at the end of the first base (121), and the output shaft of the first servo motor (125) is in transmission connection with the first transmission lead screw (123); the second electric sliding rail (130) comprises a second base (131), a second guide groove (132), a second transmission lead screw (133), a second sliding block (134), and a second servo motor (135), and has the same driving structure as the first electric sliding rail (120); the second base (131) of the second electric sliding rail (130) is fixedly connected with the first sliding block (124); the upper end (210) of the lifting mechanism (200) is fixedly connected with the second sliding block (134), and the second sliding block (134) forms a movable execution end of the movable sliding table (100).

6. The probe arm for an automatic inspection machine of claim 1, wherein: The movable sliding table (100) further comprises a third electric sliding rail which has the same structure as the first electric sliding rail (120) and is arranged in parallel with the first electric sliding rail (120); the third base, the third guide groove, the third transmission lead screw, the third sliding block, and the third servo motor of the third electric sliding rail are arranged in the same way as the first electric sliding rail (120); and the third sliding block is fixedly connected with the second base (131) of the second electric sliding rail (130).

7. The probe arm for an automated inspection machine of claim 1, wherein: The upper end of the mandrel (800) is provided with a connecting seat (820) having a receiving hole (822); a limiting disc (830) is arranged in the receiving hole (822), and the limiting disc (830) is located on the inner side of the lower end of the receiving hole (822); a flange bushing (840) is rotatably fitted in the lower end of the receiving hole (822), and the flange of the flange bushing (840) is located on the outer side of the lower end of the receiving hole (822); a connecting bolt (850) penetrates the center holes of the limiting disc (830) and the flange bushing (840) and is threadedly connected with the end of the mandrel (800); and the side surface of the connecting seat (820) is provided with a lateral assembly groove (821).

8. The probe arm for an automatic inspection machine of claim 1, wherein: The upper end of the intermediate sleeve (500) is provided with a counterbore (520), and the counterbore (520) is provided with a compression spring (540); one end of the compression spring (540) abuts against the bottom wall of the counterbore (520), and the other end of the compression spring (540) abuts against the flange bushing (840).

9. The probe arm for an automatic inspection machine of claim 1, wherein: The lower section of the mandrel (800) has a rack section (860), and the two sides of the rack section (860) are provided with driving toothed portions (810) for engaging with the second gear (20).

10. The probe arm for an automated inspection machine of claim 1, wherein: The lifting mechanism (200) is a pneumatic lifting structure, an electric lifting structure, or an electro-hydraulic servo lifting structure.

Images