A stretching device for testing spring elasticity

Abstract

The present invention discloses a stretching device for spring elastic force detection, which relates to the technical field of spring processing stretching detection, including a base plate, a positioning frame is arranged at the top of the base plate, and extension shaft plates are arranged on the front and rear sides of the positioning frame, a positioning turntable is arranged in the middle of the extension shaft plate, and three annular array loading tubes are arranged on the outside of the positioning turntable. In the present invention, the spring workpiece to be processed is inserted into the inside of the loading tube, and the transposition motor drives the positioning turntable to rotate 120 degrees each time to allow the three loading tubes and the springs inside them to reach the upper detection station in turn. Before the two locking tubes are inserted into the two ends of the spring, the staff presses the pressing rod in, and after the locking tube is inserted into the spring, the staff releases the pressing rod again, and the slope surface of the stopper will contact the spring bar, and the spring and the locking tube will be connected together. When the two locking tubes expand to both sides, the tension detector will display the tension value.

Description

Technical Field

[0001] The invention relates to the field of elastic materials, in particular to a stretching device for detecting spring elastic force. Background Art

[0002] With the development of industrial technology, modern elastic materials have become more and more perfect. Springs need to undergo tensile testing during production and processing to eliminate unqualified products. When the spring is stretched or compressed, the spring body is prone to distortion, which can easily affect the accuracy of elastic force testing.

[0003] As proposed in Patent No. 202011258793.9, a tensile elastic force detection device for spring processing relates to the technical field of spring processing tensile detection, specifically a base, a transparent protective plate and an N fixing nail. The base is provided with an inner cavity, and a hinge is fixed on the outer wall surface of the inner cavity. The outer wall surface of the hinge is connected to the shell door, and the shell door and the inner cavity are connected by a pin. The transparent protective plate is fixed to the top surface of the base. The tensile elastic force detection device for spring processing is convenient to engage. The setting of the integrated structure between the long nail, the short nail and the arc-shaped mouth effectively improves the stability of the N fixing nail, thereby avoiding that when the two ends of the spring are fixed during stretching, due to the large pulling force, one end of the spring is separated from the detection device, thereby causing the spring to threaten the safety of the staff around the device during expansion and contraction, thereby affecting the performance of the spring tensile detection device.

[0004] This invention has the following defects when in use: first, the spring body is easily broken during the stretching process, and the spring will be deformed or even scrapped after testing and can no longer be used; second, the pulling hook is easily unhooked from the spring during the stretching process, and the spring will fly out at the moment of unhooking. Summary of the invention

[0005] The present invention provides a stretching device for spring elastic force detection, which inserts a spring workpiece to be processed into the interior of a loading tube. At this time, a position change motor drives a positioning turntable to rotate 120 degrees each time to allow three loading tubes and the springs inside thereof to reach the upper detection station in turn. Before two locking tubes are inserted into the two ends of the spring, a staff member presses a pressing rod into them. After the locking tubes are inserted into the interior of the spring, the staff member releases the pressing rod again. At this time, the slope surface of the stop block will contact the spring bar, and the spring and the locking tube will be connected together. When the two locking tubes expand to both sides, the tension detector will display the tension value. Compared with the spring pulling device of the prior art, the previous spring will cause the spring to be twisted during the pulling process. The spring of the present invention will not be twisted inside the loading tube, and the spring will remain in a straight state during the stretching process, thereby solving the problems raised in the above background technology.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A stretching device for detecting spring elastic force comprises a base plate, four supporting legs are arranged at the bottom end of the base plate, a positioning frame is arranged at the top end of the base plate, extension shaft plates are arranged at the front and rear sides of the positioning frame, a positioning turntable is arranged for rotation in the middle of the extension shaft plate, a central axis is arranged in the middle of the positioning turntable, the central axis is installed on the output end of a transposition motor, the transposition motor is fixed on the outer side wall of the extension shaft plate, three loading tubes in an annular array are arranged on the outer side of the positioning turntable, and the interior of the loading tubes is filled with spring workpieces to be detected; two carrying guide rails are arranged at the bottom of the base plate, an expansion slider is slidably installed on the carrying guide rails, a loading platform is fixedly arranged at the bottom of the expansion slider, the loading platform is connected to the expansion power mechanism, a surrounding bridge is arranged on the side wall of the loading platform, a locking tube is arranged at the top of the surrounding bridge, and a locking buckle assembly is arranged in the locking tube; the axis of the locking tube and the loading tube The axis of the locking tube coincides with that of the axial center, the outer end of the locking tube is provided with an assembly block, the bottom end of the assembly block is provided with a tension detector, the tension detector is fixedly connected to the top surface of the surrounding bridge, further, the top end of the loading tube is provided with a through hole, the inside of the through hole is slidably inserted with an elastic rod, the bottom end of the elastic rod is provided with a rubber pad, the rubber pad is pressed on the spring workpiece, the top end of the elastic rod is provided with a lifting flange, the outside of the elastic rod is also provided with a pressure spring, the bottom end of the pressure spring is fixedly connected to the outer wall of the loading tube, the top end of the pressure spring is fixedly connected to the lifting flange, the inside of the loading tube is also provided with a thickness adjustment mechanism, further, the thickness adjustment mechanism includes an inner liner inside the loading tube, the top end of the inner liner is provided with a docking port matching the through hole, a locking strip is provided on the inner side wall of the loading tube, a wire groove matching the locking strip is provided on the outer side wall of the inner liner, and a clamping strip is also provided on the inner side wall of the inner liner.

[0008] Furthermore, the locking assembly includes a pressing rod inside the locking tube, two rubber bands are provided at the top of the locking tube, the rubber bands are fixedly connected to the inner walls of the locking tube respectively, a pressing strip is provided in the middle of the rubber band, a pressing hole matching the pressing strip is provided on the locking tube, and a stop block is provided at the end of the pressing rod.

[0009] Furthermore, a slope surface is provided on the side wall of the stopper facing the locking tube, and the slope of the slope surface matches the slope of the spring.

[0010] Furthermore, the expansion power mechanism includes a shaft seat at the bottom of the base plate, a threaded rod is rotatably installed inside the shaft seat, the threads at both ends of the threaded rod are in opposite directions, a nut block mounted on the threaded rod is provided on the stage, a driven bevel gear is mounted on the threaded rod, a driving bevel gear is provided on one side of the driven bevel gear, the driving bevel gear and the driven bevel gear are meshed with each other, and the driving bevel gear is installed on the output end of the stepper motor.

[0011] Furthermore, the ratio of the number of teeth of the driving bevel gear to that of the driven bevel gear is one to two.

[0012] As a preferred technical solution of a stretching device for spring elastic force detection of the present invention,

[0013] The present invention has the following benefits:

[0014] First, the spring workpiece to be processed is inserted into the interior of the loading tube. At this time, the shifting motor drives the positioning turntable to rotate 120 degrees each time to allow the three loading tubes and the springs inside them to reach the upper inspection station in turn. Before the two locking tubes are inserted into the two ends of the spring, the staff presses the pressing rod in. After the locking tube is inserted into the interior of the spring, the staff releases the pressing rod again. At this time, the slope surface of the block will contact the spring bar, and the spring and the locking tube will be connected together. When the two locking tubes expand to both sides, the tension detector will display the tension value. Compared with the spring pulling device in the prior art, the previous spring will cause the spring to twist during the pulling process. The spring of the present invention will not twist inside the loading tube, and the spring will remain straight during the stretching process.

[0015] Secondly, when springs of different diameters need to be processed, the inner liner is inserted into the loading tube, and the wire groove on the outside of the inner liner is aligned with the locking strip and inserted into it. After the inner liner and the loading tube are combined into one, springs of smaller diameter can be loaded into the inner liner. The staff can load multiple layers of inner liners into the loading tube according to the processing needs. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the front view structure of a stretching device used for spring elastic force detection.

[0017] Figure 2 It is a side view structural schematic diagram of a stretching device used for spring elastic force detection.

[0018] Figure 3 The figure is a schematic diagram of the structure of a stretching device used for spring elastic force detection, viewed from above.

[0019] Figure 4 The figure is a schematic diagram of the structure of a positioning frame in a stretching device for detecting spring elastic force.

[0020] Figure 5 The figure is a schematic diagram of the structure of a positioning turntable in a stretching device for detecting spring elastic force.

[0021] Figure 6 The figure is a schematic diagram of the structure of an inner liner in a stretching device for detecting spring elastic force.

[0022] Figure 7 The figure is a schematic diagram of the structure of a locking tube in a stretching device for detecting spring elastic force.

[0023] In the figure: base plate 1, supporting leg 101, positioning frame 2, extension shaft plate 201, positioning turntable 3, central axis 301, transposition motor 302, surrounding bridge 4, carrying guide rail 401, loading platform 402, threaded rod 403, driven bevel gear 404, stepping motor 405, locking tube 5, assembly block 501, tension detector 502, pressing hole 503, pressing rod 504, pressing strip 505, rubber band 506, stop block 507, ramp surface 508, loading tube 6, locking strip 601, elastic rod 602, pressure spring 603, lifting flange 604, rubber pad 605, perforation 606, liner 7, clamping strip 701, wire groove 702. DETAILED DESCRIPTION

[0024] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0025] It should be noted that the directions or positional relationships indicated by terms such as “center”, “up”, “down”, “left”, “right”, “vertical”, “horizontal”, “inside” and “outside” are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limitations on the present invention.

[0026] See also Figure 1-7A stretching device for spring elastic force detection includes a base plate 1, four supporting legs 101 are arranged at the bottom end of the base plate 1, a positioning frame 2 is arranged at the top end of the base plate 1, and an extension shaft plate 201 is arranged at the front and rear sides of the positioning frame 2. A positioning turntable 3 is arranged in the middle of the extension shaft plate 201, and a central axis 301 is arranged in the middle of the positioning turntable 3. The central axis 301 is installed on the output end of the transposition motor 302, and the transposition motor 302 is fixed on the outer wall of the extension shaft plate 201. , three annular array loading tubes 6 are arranged on the outer side of the positioning turntable 3, and the spring workpieces to be tested are filled in the loading tubes 6; two carrying guide rails 401 are arranged at the bottom of the base plate 1, and an expansion slider is slidably installed on the carrying guide rails 401, and a loading platform 402 is fixedly arranged at the bottom of the expansion slider, and the loading platform 402 is connected to the expansion power mechanism, and a surrounding bridge 4 is arranged on the side wall of the loading platform 402, and a locking tube 5 is arranged at the top of the surrounding bridge 4, and a locking component is arranged in the locking tube 5;The axis of the locking tube 5 coincides with the axis of the loading tube 6. An assembly block 501 is provided at the outer end of the locking tube 5. A tension detector 502 is provided at the bottom end of the assembly block 501. The tension detector 502 is fixedly connected to the top surface of the surrounding bridge 4. The spring workpiece to be processed is inserted into the interior of the loading tube 6. At this time, the transposition motor 302 drives the positioning turntable 3 to rotate 120 degrees each time to allow the three loading tubes 6 and the springs inside them to reach the upper detection station in turn. The locking tube 5 is inserted into the two ends of the spring to hook the spring workpiece. When the two locking tubes 5 expand to both sides, the tension detector 502 will Display the pulling force value. Compared with the spring pulling device in the prior art, the previous spring will cause the spring to twist during the pulling process. The spring of the present invention will not twist inside the loading tube, and the spring will remain in a straight state during the stretching process. The top of the loading tube 6 is provided with a through hole 606, and an elastic rod 602 is slidably inserted inside the through hole 606. The bottom end of the elastic rod 602 is provided with a rubber pad 605, and the rubber pad 605 is pressed on the spring workpiece. The top of the elastic rod 602 is provided with a lifting flange 604, and the outer side of the elastic rod 602 is also provided with a pressure spring 603. The pressure The bottom end of the spring 603 is fixedly connected to the outer wall of the loading tube 6, and the top end of the pressure spring 603 is fixedly connected to the lifting flange 604. The interior of the loading tube 6 is also provided with a thickness adjustment mechanism. Before the spring workpiece is inserted into the loading tube 6, the elastic rod 602 is first pulled up a short distance. After the spring workpiece is inserted into the loading tube 6, the elastic rod 602 is released. The rubber pad 605 temporarily locks the position of the spring workpiece through the elastic force of the pressure spring 603 to prevent the spring workpiece from falling off when the loading tube 6 is active. The thickness adjustment mechanism includes an inner liner 7 inside the loading tube 6, and the top end of the inner liner 7 is provided There is a docking port matching the perforation 606, a locking strip 601 is provided on the inner side wall of the loading tube 6, a wire groove 702 matching the locking strip 601 is provided on the outer side wall of the inner liner 7, and a clamping strip 701 is also provided on the inner side wall of the inner liner 7. When springs of different diameters need to be processed, the inner liner 7 is inserted into the loading tube 6, and the wire groove 702 on the outer side of the inner liner 7 is aligned with the locking strip 601 and inserted. After the inner liner 7 and the loading tube 6 are integrated, a spring of a smaller diameter can be loaded into the inner liner 7. The staff can load multiple layers of the inner liner 7 into the loading tube according to the processing needs. ;

[0027] The lock assembly includes a pressing rod 504 inside the locking tube 5, and two rubber bands 506 are arranged on the top of the locking tube 5, and the rubber bands 506 are respectively fixedly connected to the inner wall of the locking tube 5, and a pressing strip 505 is arranged in the middle of the rubber band 506, and a pressing hole 503 matching the pressing strip 505 is arranged on the locking tube 5, and a stopper 507 is arranged at the end of the pressing rod 504. Before the two locking tubes are inserted into the two ends of the spring, the staff presses the pressing rod 504 in, and after the locking tube 5 is inserted into the spring, the staff releases the pressing rod 504 again, and at this time the stopper 507 will abut against the spring strip, and the spring and the locking tube will be connected together, which can prevent the spring from being unhooked when stretched.

[0028] The side wall of the stopper 507 facing the locking tube 5 is provided with a slope surface 508, the slope of the slope surface 508 matches the slope of the spring, and the slope surface 508 and the spring bar have a more stable fit, reducing the probability of the stopper 507 and the spring bar being decoupled.

[0029] The expansion power mechanism includes an axis seat at the bottom of the base plate 1, and a threaded rod 403 is rotatably installed inside the axis seat. The threads at both ends of the threaded rod 403 are in opposite directions. A nut block mounted on the threaded rod 403 is provided on the worktable 402. A driven bevel gear 404 is mounted on the threaded rod 403. A driving bevel gear is provided on one side of the driven bevel gear 404. The driving bevel gear and the driven bevel gear 404 are meshed with each other. The driving bevel gear is installed on the output end of the stepper motor 405. The stepper motor 405 drives the driven bevel gear 404 to rotate through the driving bevel gear. The threaded rod 403 rotates synchronously with the driven bevel gear 404. The threaded rod 403 simultaneously drives the two worktables 402 to expand or close.

[0030] The ratio of the number of teeth of the driving bevel gear and the driven bevel gear 404 is one to two. The staff can replace the driving bevel gear and the driven bevel gear 404 with different gear number ratios according to the actual needs of the detection, thereby changing the torque of the threaded rod 403.

[0031] Working principle: the spring workpiece to be processed is inserted into the interior of the loading tube 6. At this time, the transposition motor 302 drives the positioning turntable 3 to rotate 120 degrees each time to allow the three loading tubes 6 and the springs inside them to reach the upper detection station in turn. The locking tube 5 is inserted into the two ends of the spring to hook the spring workpiece. When the two locking tubes 5 expand to both sides, the tension detector 502 will display the tension value. Compared with the spring pulling device in the prior art, the previous spring will cause the spring to twist during the pulling process. The spring of the present invention will not twist inside the loading tube, and the spring will remain straight during the stretching process. Before the spring workpiece is inserted into the loading tube 6, the elastic rod 602 is pulled up a short distance. After the spring workpiece is inserted into the loading tube 6, the elastic rod 602 is released. The rubber pad 605 will temporarily lock the position of the spring workpiece through the elastic force of the pressure spring 603 to prevent the loading tube 6 from causing the spring workpiece to fall off when the spring workpiece is active. When springs of different diameters need to be processed, the inner liner 7 is inserted into the inside of the loading tube 6. The wire groove 702 on the outside of 7 is aligned with the locking strip 601 and inserted into it. After the inner liner 7 and the loading tube 6 are integrated, a spring of smaller diameter can be loaded into the inner liner 7. The staff can load a multi-layer inner liner 7 into the loading tube according to the processing needs. The staff presses the pressing rod 504 in. After the locking tube 5 is inserted into the spring, the staff releases the pressing rod 504 again. At this time, the stopper 507 will resist the spring strip, and the spring and the locking tube will be connected together, which can prevent the spring from being unhooked during stretching. The slope surface 508 and the spring strip have a more stable fit, reducing the probability of the stopper 507 and the spring strip being unhooked. The stepper motor 405 drives the driven bevel gear 404 to rotate by driving the bevel gear, and the threaded rod 403 rotates synchronously with the driven bevel gear 404. The threaded rod 403 simultaneously drives the two loading platforms 402 to expand or close. The staff replaces the driving bevel gear and the driven bevel gear 404 with different gear ratios according to the actual needs of the detection, thereby changing the torque of the threaded rod 403.

[0032] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A stretching device for spring elastic force detection, characterized in that: It comprises a base plate (1), the bottom end of which is provided with four supporting legs (101), the top end of which is provided with a positioning frame (2), the front and rear sides of which are provided with extension shaft plates (201), a positioning turntable (3) is rotatably provided in the middle of the extension shaft plate (201), a central axis (301) is provided in the middle of the positioning turntable (3), the central axis (301) is installed on the output end of a transposition motor (302), the transposition motor (302) is fixed on the outer side wall of the extension shaft plate (201), three annular array loading tubes (6) are provided on the outer side of the positioning turntable (3), and the interior of the loading tubes (6) is filled with spring workpieces to be tested; The bottom of the base plate (1) is provided with two transport rails (401), an expansion slider is slidably mounted on the transport rails (401), a loading platform (402) is fixedly arranged at the bottom of the expansion slider, the loading platform (402) is connected to the expansion power mechanism, a surrounding bridge (4) is arranged on the side wall of the loading platform (402), a locking tube (5) is arranged at the top of the surrounding bridge (4), and a locking assembly is arranged in the locking tube (5); the axis of the locking tube (5) coincides with the axis of the loading tube (6), an assembly block (501) is arranged at the outer end of the locking tube (5), a tension detector (502) is arranged at the bottom end of the assembly block (501), the tension detector (502) is fixedly connected to the top surface of the surrounding bridge (4), a through hole (606) is arranged at the top of the loading tube (6), an elastic rod (602) is slidably inserted into the inside of the through hole (606), and the elastic rod (602) The bottom end of the spring rod (602) is provided with a rubber pad (605), which is pressed onto the spring workpiece. The top end of the elastic rod (602) is provided with a lifting flange (604). The outer side of the elastic rod (602) is also provided with a pressure spring (603). The bottom end of the pressure spring (603) is fixedly connected to the outer side wall of the loading tube (6), and the top end of the pressure spring (603) is fixedly connected to the lifting flange (604). The inner side of the loading tube (6) is provided with a lifting flange (604). The part is also provided with a thickness adjustment mechanism, the thickness adjustment mechanism comprising an inner liner (7) inside the loading tube (6), the top end of the inner liner (7) being provided with a docking port matching the perforation (606), a locking strip (601) being provided on the inner side wall of the loading tube (6), a wire groove (702) matching the locking strip (601) being provided on the outer side wall of the inner liner (7), and a snap-on strip (701) being further provided on the inner side wall of the inner liner (7).

2. A stretching device for spring elastic force detection according to claim 1, characterized in that: The lock assembly comprises a pressing rod (504) inside a locking tube (5); two rubber bands (506) are arranged at the top end of the locking tube (5); the rubber bands (506) are respectively fixedly connected to the inner side walls of the locking tube (5); a pressing strip (505) is arranged in the middle of the rubber band (506); a pressing hole (503) matching the pressing strip (505) is arranged on the locking tube (5); and a stopper (507) is arranged at the end of the pressing rod (504).

3. A stretching device for spring elastic force detection according to claim 2, characterized in that: A slope surface (508) is provided on the side wall of the stopper (507) facing the locking tube (5), and the slope of the slope surface (508) matches the slope of the spring.

4. A stretching device for spring elastic force detection according to claim 1, characterized in that: The expansion power mechanism comprises an axle seat at the bottom of the base plate (1), a threaded rod (403) is rotatably mounted inside the axle seat, the threads at both ends of the threaded rod (403) are in opposite directions, a nut block mounted on the threaded rod (403) is arranged on the stage (402), a driven bevel gear (404) is mounted on the threaded rod (403), a driving bevel gear is arranged on one side of the driven bevel gear (404), the driving bevel gear and the driven bevel gear (404) are meshed with each other, and the driving bevel gear is mounted on the output end of the stepping motor (405).

5. A stretching device for spring elastic force detection according to claim 4, characterized in that: The ratio of the number of teeth of the driving bevel gear and the driven bevel gear (404) is one to two.

Images