CN210208801U

CN210208801U - Automatic dumbbell type sampling machine

Info

Publication number: CN210208801U
Application number: CN201822276050.9U
Authority: CN
Inventors: Zhangang Sun; 孙占刚; Honglun Hong; 洪红伦; Wencheng Wang; 王文成; Yanjun Liu; 刘艳军
Original assignee: Chengde Petroleum College
Current assignee: Chengde Petroleum College
Priority date: 2018-12-26
Filing date: 2018-12-26
Publication date: 2020-03-31
Anticipated expiration: 2028-12-26

Abstract

An automatic dumbbell type sampling machine comprises a rack, wherein a longitudinal reciprocating platform and a transverse moving platform are arranged above the rack, a clamp body and a profiling are arranged on the longitudinal reciprocating platform, and a milling cutter is arranged on the transverse moving platform; the same counterweight devices are respectively arranged at the front and the rear of the transverse moving platform, and the milling cutter is abutted against the profiling mold under the action of the pressing force of the counterweight devices. The utility model discloses a packing force between high, the milling cutter of preparation process automation degree and sample is invariable and mill one shot forming.

Description

Automatic dumbbell type sampling machine

Technical Field

The utility model belongs to the technical field of dumbbell type sampling machine, especially, relate to an automatic dumbbell type sampling machine.

Background

The dumbbell test specimens are standard test specimens used for determining the tensile properties of thermoplastic pipes. GB/T8804.1-2003 section 1 determination of tensile Properties of thermoplastic pipes: the specific requirement of "milling is required to prepare a sample by machining" is specified in the clause of "machining method" 5.2.2.3 of the general rules of test methods ".

Currently, the 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 fixture with a dumbbell-shaped profiling, a motor drives a main shaft to enable a milling cutter to do rotary motion, an operator holds a handle on the fixture with a hand, on one hand, pressure is applied to enable two side surfaces of the dumbbell-shaped profiling on the fixture to be in contact with two bearings on the main shaft, and the milling cutter moves in a curve relative to the profiling consistently; on one hand, the sample is dragged to move back and forth, so that the standard sample consistent with the master form is processed. In the processing process, due to the reasons of uneven force application of operators, uneven moving speed and inconsistent moving direction of the clamp, the problems of poor quality of the processed surface of the sample and the like are easily caused, so that the excessive rejection rate is caused; meanwhile, the labor intensity of operators is high, the danger is high, but the equipment price is low, so that the application range in the market is wide. The second type is a numerical control dumbbell type sample making machine, the motion track of the milling cutter is controlled by a numerical control program, the processing efficiency and the processing quality are high, but the defects of expensive equipment, high processing cost and maintenance cost and the like exist, so the application in the market is less. The third type is a semi-automatic dumbbell type sample making machine, namely, the movement of a clamp in the first type of equipment mainly operated by hand is changed into the movement driven by a motor, a milling cutter and a sample are pressed by a spring, after one surface of the sample is milled, because the cutting edge of the milling cutter has directionality when the sample is processed, the motor needs to be reversed or the milling cutter is retreated to the starting point, then the next milling is carried out until the surface is milled, and then the sample is turned around and the other surface is milled. The surface quality of the sample processed by the method is good, but in the processing process, the pressing force of a spring between the milling cutter and the sample is changed due to the change of the extension length of the spring, the sample cannot be milled successfully at one time, and the sample needs to be retreated to the starting point for re-processing, so that the processing error is caused.

SUMMERY OF THE UTILITY MODEL

Aiming at the defects of the prior art, the utility model provides an automatic dumbbell type sampling machine. The high degree of automation of the manufacturing process, the constant pressing force between the milling cutter and the sample and the one-step milling forming are realized.

The technical scheme of the utility model is that: an automatic dumbbell-shaped sampling machine comprises a milling cutter, wherein two positioning rollers are arranged on a milling cutter bar, the positioning rollers are abutted against a clamp body under the action of a pressing force applying part, the milling cutter bar is connected with a motor, the motor is fixedly arranged on a supporting plate on a transverse moving support, the left side and the right side of the supporting plate are fixedly connected with the pressing force applying part through a steel wire rope, a sliding rail on the transverse moving support is connected with a guide rail bearing fixedly connected on the supporting plate to form a moving pair, the transverse moving support is fixed on a machine frame, the clamp body is fixedly arranged on a clamp platform of a longitudinal reciprocating workbench, and the longitudinal reciprocating workbench is fixedly arranged on the machine frame.

Furthermore, the clamp body profile 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 a test piece to be processed, and the processing area of the clamp body is used as a profile 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;

furthermore, the longitudinal reciprocating movement 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, the closed bidirectional return thread is driven by a motor, the motor is fixed on the rack, a longitudinal guide rail bearing is fixed below the clamp platform, the longitudinal guide rail bearing is matched with a longitudinal guide rail 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 rack.

Further, the pressing force applying part comprises two sets of counterweight devices which are the same in 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, 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 configuration 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 utility model has the advantages that:

1. after the test piece is clamped once, the test piece moves longitudinally in a reciprocating mode, the cutter automatically converts one side of the cutter into the other side of the cutter for machining, and the cutter can be circularly machined for multiple times, so that the motor can keep rotating in the same direction, and the problems that the service life of the motor is shortened due to forward and reverse rotation of the motor, machining precision is reduced due to clamping turning around of the test piece, auxiliary time is too long due to returning of a clamp and the like are solved.

2. In the machining process, the pressing force between the cutter and the sample is provided by the gravity of the pressing force applying part, so that the pressing force is ensured to be constant, the change of the pressing force caused by the change of the length of the spring is avoided, and the machining quality is improved.

3. The reciprocating motion of the clamp, the automatic conversion of the balance weight and the like improve the automation level of the dumbbell-type sampling machine, reduce the labor difficulty of operators and reduce the cost compared with a numerical control dumbbell-type sampling machine.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic structural view of the longitudinal reciprocating table of the present invention;

FIG. 3 is a schematic view of the counterweight device of the present invention;

FIG. 4 is a schematic structural view of the processing part of the present invention;

FIG. 5 is a schematic structural view of the horizontal moving platform of the present invention;

FIG. 6 is a schematic structural view of a pressing force applying part of the present invention;

FIG. 7 is a sectional structure diagram of the clamp body of the present invention;

FIG. 8 is a schematic view of the moving track of the milling cutter of the present invention

Detailed Description

The technical solution 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. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

The technical scheme of the utility model is that: an automatic dumbbell type sampling machine comprises a milling cutter 405, two positioning rollers 407 are arranged on a cutter rod 406 of the milling cutter 405, the positioning rollers 407 are abutted against a clamp body 402 under the action of a pressing force applying part 102, the cutter rod 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 applying part 102 through a steel wire rope 306, a sliding rail on the transverse moving support 501 is connected with a guide rail bearing 503 fixedly connected on the supporting plate 504 to form a moving pair, the transverse moving support 501 is fixed on a machine frame 103, the clamp body 402 is fixedly arranged on a clamp platform 205 of a longitudinal reciprocating workbench 101, and the longitudinal reciprocating workbench 101 is fixedly arranged on the machine frame 103.

Further, as shown in fig. 7, the profile of the clamp body 402 includes three portions, i.e., a processing region CD, a non-processing region BC, and a DE section, and a transition region AB, and an EF section;

further, the profile of the machining area of the fixture body 402 is consistent with the profile of the test piece 403 to be machined, and the profile of the machining area of the fixture body 402 is used as a profile for machining the test piece 403;

further, the test piece 403 to be processed is fixed on the clamp body 402 through a compression bolt 404 mounted on the clamp body 402;

further, the longitudinal reciprocating table 101 includes 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 is matched with a longitudinal guide rail 207 to form a moving pair, the longitudinal guide rail 207 is parallel to 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 weight devices 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 flexible rope 303 and a tray 301, one end of the steel wire rope 306 is fixedly connected with a support plate 504 of the transverse moving bracket 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 flexible rope 303, and the upper counterweight block 304 and the lower counterweight block 302 are both provided with two guide holes to form a moving pair with the two guide rods 305 fixed on the frame 103;

further, the symmetrical plane of the fixture body 402 coincides with the installation symmetrical plane of the two sets of counterweight devices;

further, the central axis of rotation of the milling cutter 405 is located at the front-rear symmetrical center of the supporting plate 504 of the traverse platform 105, as shown in fig. 4;

the working principle is as follows: as shown in fig. 8, in use, taking the starting point as the location of the milling cutter 405 in the non-machining area ab of the fixture body 402 as an example, at this time, since the symmetric plane of the supporting plate 504 of the traverse platform 105 is located a distance forward relative to the installation symmetric plane of the two counterweight devices, at this time, the upper counterweight block 304-1 of the front counterweight device is located a distance downward relative to the upper counterweight block 304-2 of the rear counterweight device, and the lower counterweight block 302-1 of the front counterweight device is in contact with the tray 301-1 and the inelastic soft rope 303-1 is loosened, the lower counterweight block 302-2 of the rear counterweight device is separated from the tray 301-2, so that in this initial state, the pressing force applied to the milling cutter 405 is a backward force equal to the weight of the lower counterweight block 302-2, and under this force, the milling cutter 405 is abutted to the fixture body; then, under the drive of the longitudinal reciprocating platform 101, the clamp body 402 moves leftwards, the milling cutter 405 and the front face of the explorator 403 in the clamp body 402 abut against the front face of the processed test piece until reaching a non-processing area cd, and the stress magnitude and the stress direction of the milling cutter are unchanged in the process; as the contour shape of the transition zone df of the clamp body 402 is arc-shaped, when the milling cutter 405 moves to the transition zone df of the clamp body 402, under the action of force, the milling cutter 405 moves backwards along the arc de, when the milling cutter 405 moves to the e point position, the lower balancing weight 302-2 of the rear balancing device just contacts with the tray 301-2, the lower balancing weight 302-1 of the front balancing device just separates 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 platform 101 is shifted to the conversion direction, therefore, at the next moment, the longitudinal reciprocating moving platform 101 drives the clamp body 402 to move rightwards, under the action of inertia, the milling cutter 405 moves to the transition zone ef section of the clamp body 402, at the moment, the lower balancing weight 302-1 of the front balancing device separates from the tray 301-1, the lower balancing weight 302-2 of the rear balancing device contacts with the tray 301-2, and the inelastic soft rope 303-2 is loose And (3) relaxing, wherein the pressing force applied to the milling cutter 405 is forward in direction and equal to the weight of the lower balancing weight 302-1 in magnitude, along with the rightward movement of the clamp body 402, the milling cutter 405 starts to abut against the back of the profiling 403, the back of the test piece is machined until the non-machining area hi is reached, the machining of the back of the test piece is completed, then the milling cutter 405 moves along the transition area ia of the clamp body 402, and the direction of the pressing force is changed at the point j until the machining starting point is reached. During the machining of the test piece, the pressing force of the milling cutter 405, the clamp body 402 and the master model 403 is constant, and the direction of the pressing force always points to the front and back symmetrical surfaces of the master model 403.

Claims

1. An automatic dumbbell type sampling machine is characterized in that: the milling cutter comprises a milling cutter, wherein two positioning rollers are arranged on a milling cutter bar, the positioning rollers are abutted against a clamp body under the action of a pressing force applying part, the milling cutter bar is connected with a motor, and the motor is fixedly arranged on a supporting plate on a transverse moving support.

2. An automatic dumbbell-type sampling machine according to claim 1, characterized in that: the left side and the right side of a supporting plate of the transverse moving support are fixedly connected with the pressing force applying part through a steel wire rope, a sliding rail on the transverse moving support is connected with a guide rail bearing fixedly connected on the supporting plate to form a moving pair, and the transverse moving support is fixed on the rack.

3. An automatic dumbbell-type sampling machine according to claim 1, characterized in that: 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 rack.

4. An automatic dumbbell-type sampling machine according to claim 1, characterized in that: the contour of the processing area of the clamp body is consistent with that of the test piece to be processed, the processing area of the clamp body is used as a profile for processing the test piece, and the test piece to be processed is fixed on the clamp body through a compression bolt arranged on the clamp body.

5. An automatic dumbbell-type prototype machine according to claim 3, characterized in that: the longitudinal reciprocating workbench comprises a clamp platform, wherein 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.

6. An automatic dumbbell-type sampling machine according to claim 5, characterized in that: the motor is fixed on the rack, 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 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 rack.

7. An automatic dumbbell-type sampling machine according to claim 1, characterized in that: the pressing force applying part comprises two sets of counterweight devices which are the same in the front and the back.