CN109702250B - Automatic dumbbell type sampling machine - Google Patents
Automatic dumbbell type sampling machine Download PDFInfo
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- CN109702250B CN109702250B CN201811653744.8A CN201811653744A CN109702250B CN 109702250 B CN109702250 B CN 109702250B CN 201811653744 A CN201811653744 A CN 201811653744A CN 109702250 B CN109702250 B CN 109702250B
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- milling cutter
- clamp body
- counterweight block
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- balancing weight
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Abstract
The novel dumbbell-shaped nonmetal material sampling machine comprises a frame, wherein a longitudinal reciprocating platform and a transverse moving platform are arranged above the frame, a clamping body and a profiling are arranged on the longitudinal reciprocating platform, and a milling cutter is arranged on the transverse moving platform; the front and the rear of the transverse moving platform are respectively provided with a set of same counterweight device, and the milling cutter is abutted against the explorator under the action of the pressing force of the counterweight devices. The invention realizes the one-step forming of milling with high automation degree, constant pressing force between the milling cutter and the sample in the manufacturing process.
Description
Technical Field
The invention belongs to the technical field of dumbbell-shaped sampling machines, and particularly relates to an automatic dumbbell-shaped sampling machine.
Background
Dumbbell test specimens were standard test specimens for measuring the tensile properties of thermoplastic pipes. GB/T8804.1-2003 thermoplastic pipe tensile Property determination part 1: the specific requirements of "preparing samples by mechanical processing methods, requiring milling" are explicitly indicated in the "mechanical processing methods" clause 5.2.2.3 of the general rules of test methods ".
Currently, dumbbell-type sampling machines on the market mainly have the following three types: the first type is mainly manual operation, namely a sample is fixed in a clamp with a dumbbell-shaped profiling, a motor drives a main shaft to enable a milling cutter to rotate, an operator holds a handle on the clamp by hand, on one hand, pressure is applied to enable two side faces of the dumbbell-shaped profiling on the clamp to be in contact with two bearings on the main shaft, and the milling cutter moves in a consistent mode relative to the profiling curve; on the one hand, the sample is dragged to move back and forth, so that the standard sample consistent with the profiling is processed. In the processing process, the problems of poor quality of the processing surface of the sample and the like are easily caused due to uneven force application of operators, uneven moving speed of the clamp and inconsistent moving direction, so that excessive rejection rate is caused; meanwhile, the labor intensity of operators is high, the danger is high, but the equipment price is low, and the application range in the market is wider. The second type is a numerical control dumbbell-type sampling machine, the movement track of the milling cutter is controlled by a numerical control program, the machining efficiency and the machining quality are high, but the defects of high equipment, high machining cost, high maintenance cost and the like exist, so that the numerical control dumbbell-type sampling machine has less application in the market. The third type is a semi-automatic dumbbell type sampling machine, namely the movement of a clamp in equipment which is mainly operated by hands is changed into movement driven by a motor, the clamp is pressed between a milling cutter and a sample by a spring, after one side of the sample is milled, the milling cutter needs to be reversed or is returned to a starting point due to directionality when the cutting edge of the milling cutter is used for processing the sample, then the milling of the next cutter is carried out until the side is milled, and then the sample is turned around and the other side is milled. The surface quality of the sample processed by the method is good, but the compression force of the spring between the milling cutter and the sample is changed due to the change of the tensile length of the spring, the sample cannot be milled successfully at one time, and the sample needs to be returned to the starting point for reprocessing, so that processing errors are caused.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides an automatic dumbbell type sampling machine. The manufacturing process is high in automation degree, the pressing force between the milling cutter and the sample is constant, and the milling is formed at one time.
The technical scheme of the invention is as follows: the utility model provides an automatic dumbbell type sampling machine, includes the milling cutter, the milling cutter arbor on be provided with two positioning roller, positioning roller and the anchor clamps body be close to under the effect of compressing force applys the part, the milling cutter arbor be connected with the motor, motor fixed mounting in the backup pad on the lateral shifting support, the left and right sides and the compressing force of backup pad applys the part and pass through wire rope fixed connection, the sliding rail on the lateral shifting support and the guide rail bearing connection that links firmly in the backup pad constitute the shifting pair, the lateral shifting support fix in the frame, anchor clamps body fixed mounting on the anchor clamps platform of vertical reciprocating motion workstation, vertical reciprocating motion workstation fixed mounting in the frame.
Further, the profile of the clamp body comprises a processing area, a non-processing area and a transition area;
further, the contour of the processing area of the clamp body is consistent with the contour of the test piece to be processed, and the processing area of the clamp body is used as a master model for processing the test piece;
further, the test piece to be processed is fixed on the clamp body through a compression bolt arranged on the clamp body;
further, the longitudinal reciprocating workbench comprises a clamp platform, a thread bush is fixed below the clamp platform, the thread bush is matched with a closed bidirectional return thread screw rod, the closed bidirectional return thread is driven by a motor, the motor is fixed on the frame, a longitudinal guide rail bearing is fixed below the clamp platform, the longitudinal guide rail bearing and the longitudinal guide rail are matched to form a moving pair, the longitudinal guide rail direction is parallel to the direction of the closed bidirectional return thread, and the longitudinal guide rail is fixed on the frame.
Further, the pressing force applying part comprises two sets of counterweight devices with the same front and back; the counterweight device comprises a steel wire rope, a pulley, a guide rod, an upper counterweight block, a lower counterweight block and an inelastic soft rope, wherein one end of the steel wire rope is fixedly connected with the transverse moving support, the other end of the steel wire rope is fixedly connected with the upper counterweight block, the steel wire rope bypasses the pulley, the upper counterweight block is connected with the lower counterweight block through the inelastic soft rope, two guide holes are formed in the upper counterweight block and the lower counterweight block, and the guide holes and the two guide rods fixed on the frame form a moving pair.
The invention has the advantages that:
1. after the test piece is clamped once, the test piece reciprocates longitudinally, the cutter is automatically converted to the other side for processing after processing one side, and the cutter can circularly process for many times, so that the motor can rotate in the same direction, and the problems of the reduction of the service life of the motor caused by forward and reverse rotation of the motor, the reduction of processing precision caused by turning around and clamping of the test piece, the overlong auxiliary time caused by retracting of the clamp and the like are avoided.
2. In the processing process, the pressing force between the cutter and the sample is provided by the gravity of the pressing force applying part, so that the constant pressing force is ensured, the change of the pressing force caused by the change of the length of the spring is avoided, and the processing quality is improved.
3. The reciprocating motion of the clamp, the automatic conversion of the counterweight and the like improve the automation level of the dumbbell-shaped sampling machine, reduce the labor difficulty of operators, and reduce the cost compared with the numerical control dumbbell-shaped sampling machine.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of the structure of the present invention;
FIG. 2 is a schematic view of a longitudinally reciprocating table according to the present invention;
FIG. 3 is a schematic view of a counterweight device according to the invention;
FIG. 4 is a schematic view of a processing part structure of the present invention;
FIG. 5 is a schematic view of a lateral mobile platform according to the present invention;
FIG. 6 is a schematic view of a pressing force applying portion of the present invention;
FIG. 7 is a schematic view of a partitioning structure of a fixture body according to the present invention;
FIG. 8 is a schematic view of the travel path of the milling cutter according to the present invention
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The technical scheme of the invention is as follows: the automatic dumbbell-shaped sampling machine comprises a milling cutter 405, wherein two positioning rollers 407 are arranged on a cutter bar 406 of the milling cutter 405, the positioning rollers 407 are abutted against a clamp body 402 under the action of a pressing force application part 102, the cutter bar 406 is connected with a motor 505, the motor 505 is fixedly arranged on a supporting plate 504 on a transverse moving support 501, the left side and the right side of the supporting plate 504 of the transverse moving support 501 are connected with the pressing force application part 102 through steel wires 306, sliding rails on the transverse moving support 501 are connected with guide rail bearings 503 fixedly connected to the supporting plate 504 to form a moving pair, the transverse moving support 501 is fixed on a frame 103, the clamp body 402 is fixedly arranged on a clamp platform 205 of the longitudinal reciprocating table 101, and the longitudinal reciprocating table 101 is fixedly arranged on the frame 103.
Further, as shown in fig. 7, the profile of the fixture body 402 includes three parts of a processing area CD section, a non-processing area BC section and DE section, and a transition area AB section and EF section;
further, the contour of the processing area of the fixture body 402 is consistent with the contour of the test piece 403 to be processed, and the contour of the processing area of the fixture body 402 is used as a master model for processing the test piece 403;
further, the test piece 403 to be processed is fixed on the fixture body 402 through a compression bolt 404 installed on the fixture body 402;
further, the longitudinally reciprocating workbench 101 comprises a clamp platform 205, a threaded sleeve 208 is fixed below the clamp platform 205, the threaded sleeve 208 is matched with a closed bidirectional return threaded screw 204, the closed bidirectional return threaded screw 204 is driven by a motor 201, the motor 201 is fixed on the frame 103, a longitudinal guide rail bearing 206 is fixed below the clamp platform 205, the longitudinal guide rail bearing 206 and the longitudinal guide rail 207 are matched to form a moving pair, the direction of the longitudinal guide rail 207 is parallel to the direction of the closed bidirectional return threaded screw 204, and the longitudinal guide rail 207 is fixed on the frame 103.
Further, the pressing force applying portion 102 includes two sets of counterweight devices which are identical in front and rear, as shown in fig. 3; the counterweight device comprises a steel wire rope 306, a pulley 310, a guide rod 307, an upper counterweight block 304, a lower counterweight block 302, an inelastic soft rope 303 and a tray 301, wherein one end of the steel wire rope 306 is fixedly connected with a supporting plate 504 of the transverse moving support 501, the other end of the steel wire rope 306 is fixedly connected with the upper counterweight block 304, the steel wire rope 306 bypasses the pulley 310, the upper counterweight block 304 is connected with the lower counterweight block 302 through the inelastic soft rope 303, and two guide holes are formed in the upper counterweight block 304 and the lower counterweight block 302 and form a moving pair with two guide rods 307 fixed on the frame 103;
further, the symmetry plane of the fixture body 402 coincides with the installation symmetry planes of the two sets of counterweight devices;
further, the rotation center axis of the milling cutter 405 is located at the front-rear symmetry center of the support plate 504 of the lateral moving platform 105, as shown in fig. 4;
working principle: in use, as shown in fig. 8, taking the starting point as an example that the milling cutter 405 is located in the non-processing area ab section of the fixture body 402, at this time, since the symmetry plane of the supporting plate 504 of the transverse moving platform 105 faces forward relative to the installation symmetry plane of the two weight balancing devices, at this time, the upper weight block 304-1 of the front weight balancing device is downward relative to the upper weight block 304-2 of the rear weight balancing device, and when the lower weight block 302-1 of the front weight balancing device is in contact with the tray 301-1 and the inelastic soft rope 303-1 is loosened, the lower weight block 302-2 of the rear weight balancing device is separated from the tray 301-2, so that in this initial state, the pressing force applied by the milling cutter 405 is a rearward force, the magnitude of which is equal to the weight of the lower weight block 302-2, and under the action of this force, the milling cutter 405 is abutted against the fixture body 402; then, under the drive of the longitudinally reciprocating table 101, the clamp body 402 moves leftwards, the front faces of the milling cutter 405 and the profiling 403 in the clamp body 402 are abutted against the front faces of the processing test piece until the non-processing area cd, and the stress magnitude and the stress direction of the milling cutter are unchanged in the process; because the profile shape of the transition region df of the clamp body 402 is circular arc, when the milling cutter 405 moves to the transition region df of the clamp body 402, the milling cutter 405 moves backwards along the circular arc under the action of force, when the milling cutter 405 moves to the e point position, the lower balancing weight 302-2 of the rear balancing weight device just contacts with the tray 301-2, the lower balancing weight 302-1 of the front balancing weight device just breaks away from the tray 301-1, the backward moving speed of the transverse moving platform 105 is greater than zero, the closed bidirectional screw thread 204 of the longitudinal reciprocating moving workbench 101 is at the transition direction, therefore, the next moment, the longitudinal reciprocating moving workbench 101 drives the clamp body 402 to move rightwards, the milling cutter 405 moves to the transition region ef section of the clamp body 402 under the action of inertia, at this moment, the lower balancing weight 302-1 of the front balancing weight device is separated from the tray 301-1, the lower balancing weight 302-2 of the rear balancing weight device is in contact with the tray 301-2 and the inelastic soft rope 303-2 is loose, the pressing force applied by the milling cutter 405 is the forward direction and is equal to the weight of the lower balancing weight 302-1, along with the rightward movement of the clamp body 402, the longitudinal reciprocating moving workbench 101 drives the clamp body 402 to move rightwards, the milling cutter 405 begins to finish the transition region of the workpiece along the direction of the die, and the rest position is completed, and the machining of the workpiece is completed until the workpiece is in the transition region is completed, and the position is in the direction of the following position, and the position of the workpiece is not the die point, and the workpiece is finished. During the test piece machining process, the pressing force of the milling cutter 405, the clamp body 402 and the profiling 403 is always unchanged, and the direction always points to the front-back symmetrical surface of the profiling 403.
Claims (1)
1. The automatic dumbbell-type sampling machine comprises a milling cutter, wherein two positioning rollers are arranged on a milling cutter rod, the positioning rollers are abutted against a clamp body under the action of a pressing force applying part, the milling cutter rod is connected with a motor, and the motor is fixedly arranged on a supporting plate on a transverse moving bracket; the left side and the right side of the supporting plate are fixedly connected with the compaction force applying part through steel wire ropes, a sliding rail on the transverse moving bracket is connected with a guide rail bearing fixedly connected to the supporting plate to form a moving pair, and the transverse moving bracket is fixed on the frame; the fixture body is fixedly arranged on a fixture platform of the longitudinal reciprocating workbench, and the longitudinal reciprocating workbench is fixedly arranged on the frame; the contour of the machining area of the clamp body is consistent with that of a test piece to be machined, the machining area of the clamp body is used as a profiling of the test piece to be machined, and the test piece to be machined is fixed on the clamp body through a compression bolt arranged on the clamp body; the longitudinal reciprocating workbench comprises a clamp platform, a thread sleeve is fixed below the clamp platform, the thread sleeve is matched with a closed bidirectional return thread screw rod, and the closed bidirectional return thread is driven by a motor; the motor is fixed on the frame, a longitudinal guide rail bearing is fixed below the clamp platform, the longitudinal guide rail bearing and a longitudinal guide rail are matched to form a moving pair, the direction of the longitudinal guide rail is parallel to the direction of the closed bidirectional return thread, and the longitudinal guide rail is fixed on the frame; the pressing force applying part comprises two sets of counterweight devices with the same front and back; the counterweight device comprises a steel wire rope, a pulley, a guide rod, an upper counterweight block, a lower counterweight block and an inelastic soft rope, wherein one end of the steel wire rope is fixedly connected with the transverse moving bracket, the other end of the steel wire rope is fixedly connected with the upper counterweight block, the steel wire rope bypasses the pulley, the upper counterweight block is connected with the lower counterweight block through the inelastic soft rope, two guide holes are formed in the upper counterweight block and the lower counterweight block, and the guide holes and the two guide rods fixed on the frame form a moving pair; when the milling cutter is used, the starting point is taken as an example that the milling cutter is positioned in a non-processing area ab section of the clamp body, at the moment, the symmetry plane of the support plate of the transverse moving platform faces forward a distance relative to the installation symmetry plane of the two counterweight devices, at the moment, the upper counterweight block of the front counterweight device is downward a distance compared with the upper counterweight block of the rear counterweight device, and when the lower counterweight block of the front counterweight device is in contact with the tray and the inelastic soft rope is loosened, the lower counterweight block of the rear counterweight device is separated from the tray, so that the compaction force born by the milling cutter is a backward force, the magnitude of the compaction force is equal to the weight of the lower counterweight block, and the milling cutter is abutted against the clamp body under the action of the force; then, the clamp body moves leftwards under the drive of the longitudinal reciprocating worktable, the front faces of the milling cutter and the explorator in the clamp body are abutted against the front face of the processing test piece until the non-processing area cd, and the stress magnitude and the stress direction of the milling cutter are unchanged in the process; because the profile shape of the transition zone df of the clamp body is circular arc, when the milling cutter moves to the transition zone df of the clamp body, the milling cutter moves backwards along the circular arc under the action of force, when the milling cutter moves to the point e, the lower balancing weight of the rear balancing weight device just contacts with the tray, the lower balancing weight of the front balancing weight device just breaks away from the tray, the backward moving speed of the transverse moving platform is greater than zero, the closed bidirectional screw thread of the longitudinal reciprocating moving workbench is at the transition direction, therefore, the longitudinal reciprocating moving workbench drives the clamp body to move rightwards at the next moment, the milling cutter moves to the transition zone ef section of the clamp body under the action of inertia, at the moment, the lower balancing weight of the front balancing weight device is separated from the tray, the lower balancing weight of the rear balancing weight device contacts with the tray and the inelastic soft rope is relaxed, the compression force born by the milling cutter is the weight of which is forward in the direction and is equal to the lower balancing weight, along with the rightward movement of the clamp body, the milling cutter starts to abut against the rear of the die, the rear of a machining test piece is finished until the rear machining of the test piece is finished, the test piece moves rightwards along the transition zone ia of the clamp body, and the transition point j is finished in the direction of the compression force; in the test piece processing process, the sizes of the pressing forces of the milling cutter, the clamp body and the profiling are unchanged all the time, and the direction always points to the front-back symmetrical surface of the profiling.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811653744.8A CN109702250B (en) | 2018-12-26 | 2018-12-26 | Automatic dumbbell type sampling machine |
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| CN201811653744.8A CN109702250B (en) | 2018-12-26 | 2018-12-26 | Automatic dumbbell type sampling machine |
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| CN109702250A CN109702250A (en) | 2019-05-03 |
| CN109702250B true CN109702250B (en) | 2023-09-15 |
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