Material tensile test fixture

Abstract

The utility model relates to the technical field of fixture testing, and provides a material tensile test fixture, which comprises a device main body, a servo motor and a tensile shell, the side wall of the device main body is provided with a control panel, the servo motor is installed below the control panel, the outer wall of the device main body is provided with a movable groove, and the movable groove is connected with the tensile shell. A driving shaft of the servo motor penetrates through the outer wall of the device body, extends into the movable groove and is connected with a two-way threaded rod, stretching shells are symmetrically and movably mounted on the outer wall of the two-way threaded rod through a threaded sleeve, limiting blocks are arranged on the sides, away from the threaded sleeve, of the stretching shells, and a limiting groove is formed in the outer wall of the device body; and the stretching shell is movably installed on the outer wall of the device body through a limiting block, an electric air cylinder is installed on the side wall of the stretching shell, and the problems that in the prior art, during stretching, the two ends of a material are uneven in stress, and the outer wall of the material is prone to being damaged when the clamping force is too large are solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of fixture test, specifically, relate to a material tensile test fixture. BACKGROUND

[0002] Material tensile test is an important means of evaluating material mechanical properties (such as tensile strength, yield strength, elongation at break, etc.), and is widely used in quality control and research and development testing in the fields of metal, plastic, rubber, composite materials, etc. As the core component of the testing machine, the performance of the tensile test fixture directly affects the accuracy and repeatability of the test data.

[0003] The patent specification with publication number CN 206876488U discloses a material tensile test fixture, which is applied in the industry by setting a base and an adjusting stretching frame. The base is provided with an adjusting stretching frame and a fixing frame above. The fixing frame is provided with an ear plate on one side, and the ear plate is provided with a through hole one. A rotating shaft one is inserted into the through hole one and connected with a down pressure rod. The down pressure rod is welded with a down pressure handle. The down pressure rod is provided with a through hole two on the rod surface. A rotating shaft two is inserted into the through hole two and connected with a push rod. The push rod is provided with a through hole three on the rod surface. A rotating shaft three is inserted into the through hole three and connected with an adjusting rod. The adjusting rod is symmetrically connected with a column-shaped insert on both sides.

[0004] However, in the implementation of the related technology, it is found that the above-mentioned material tensile test fixture has the following problems. The device clamps and fixes one end of the material for stretching, and the two ends of the material are not stressed uniformly. At the same time, the outer wall of the material is easily damaged during clamping and fixing. Therefore, we propose a material tensile test fixture. UTILITY MODEL CONTENT

[0005] The utility model discloses a material tensile test fixture, which solves the problem of uneven stress on both ends of the material during stretching in the related art, and the outer wall of the material is easily damaged when the clamping force is too large.

[0006] The technical scheme of the utility model is as follows:

[0007] A material tensile test fixture, including device body, servo motor and stretching shell, the side wall of the device body is provided with a control panel, the servo motor is installed below the control panel, the outer wall of the device body is provided with a movable slot, the driving shaft of the servo motor extends to the inside of the movable slot through the outer wall of the device body and is connected with a bidirectional threaded rod, the outer wall of the bidirectional threaded rod is symmetrically movably installed with a stretching shell through a threaded sleeve, the side away from the threaded sleeve of the stretching shell is provided with a limiting block, the outer wall of the device body is provided with a limiting slot, the stretching shell is movably installed on the outer wall of the device body through the limiting block, the side wall of the stretching shell is installed with an electric cylinder, the output shaft of the electric cylinder extends to the inside of the stretching shell through the outer wall of the stretching shell and is connected with a rack, the stretching shell is symmetrically installed with a rotating shaft in the inside, the outer wall of the rotating shaft is provided with a limiting ring, the rotating shaft is movably installed with a gear through the limiting ring, the rack and the gear are mutually engaged and transmitted, the side wall of the gear is provided with a clamping rod, the end away from the gear of the clamping rod is provided with a movable block, and the clamping rod is movably installed with a clamping plate through the movable block.

[0008] Preferably, the inner wall of the stretching shell is symmetrically provided with a sliding groove, and the outer walls on both sides of the rack are symmetrically provided with sliding blocks.

[0009] Preferably, the cross section of the sliding block is rectangular, and the sliding block and the sliding groove are matched with each other.

[0010] Preferably, the outer wall of one side of the clamping plate is rectangular, and the outer wall of the clamping plate is uniformly provided with rubber pads.

[0011] Preferably, the cross section of the limiting block is trapezoidal, and the limiting groove and the limiting block are matched with each other.

[0012] Preferably, the outer wall of the bidirectional threaded rod is symmetrically provided with opposite external threads, and the inner wall of the threaded sleeve is provided with internal threads matched with the external threads.

[0013] Preferably, the outer walls on both sides of the rack are symmetrically provided with tooth blocks, and the rack is located at the middle position of the gear.

[0014] Preferably, the clamping rod is J-shaped structure, and the clamping rod is welded on the side wall of the gear.

[0015] The working principle and beneficial effects of the utility model are as follows:

[0016] 1. The utility model discloses a through the electric cylinder, rack and clamping plate that set up, the both ends of material are placed between the clamping plate, start electric cylinder and draw rack through the control panel, utilize the limiting effect of rack to rack and slide groove horizontal translation, in the process of translation and gear meshing transmission, drive gear rotation, make the clamping rod rotate when the gear rotation rotates around the center of gear as the pivot, thereby make the material in the middle of clamping plate carry out clamping and fix, utilize rubber pad can avoid the damage to the outer wall of material when clamping, simultaneously because the clamping plate is through the clamping rod movable installation in the port position of clamping rod, can make the movable block always with the outer wall of material adhere when clamping, the structure can provide stable clamping to material when using, and avoid the outer wall of material that clamping plate clamps and damages.

[0017] 2. The utility model discloses a through the servo motor, bidirectional screw rod and screw sleeve that set up, start servo motor and drive bidirectional screw rod rotation, utilize the inner thread that sets up with bidirectional screw rod in screw sleeve inner wall is matched, because the outer wall of bidirectional screw rod is provided with the outer thread of opposite direction, simultaneously through the limiting effect of limiting groove and limiting block to stretch casing, make stretch casing along the movable slot and move to both sides horizontally, to this material carries out the tensile test, the structure can simultaneously stretch the both ends of material, make the stress of material more uniform, and test is more accurate. ACCURACY

[0018] The utility model will be further explained in detail below combining with the specific embodiment and the drawing.

[0019] Figure 1 It is the device main body structure schematic drawing that the utility model proposes;

[0020] Figure 2 It is the limiting block structure schematic drawing that the utility model proposes;

[0021] Figure 3 It is the movable slot structure schematic drawing that the utility model proposes;

[0022] Figure 4 It is the rack structure schematic drawing that the utility model proposes;

[0023] Figure 5 It is the slide groove structure schematic drawing that the utility model proposes.

[0024] In the drawing: 1, device main body;2, control panel;3, servo motor;4, limiting groove;5, stretch casing;6, electric cylinder;7, movable slot;8, bidirectional screw rod;9, screw sleeve;10, limiting block;11, rack;12, slider;13, slide groove;14, gear;15, clamping rod;16, movable block;17, clamping plate;18, rotating shaft;19, limiting ring;20, rubber pad. SPECIFIC EMBODIMENT

[0025] The technical solutions of this utility model will be clearly and completely described below with reference to the embodiments of this utility model. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this utility model.

[0026] Example 1: As Figures 1-5 As shown, this embodiment proposes a material tensile testing fixture, including a device body 1, a servo motor 3, and a tensile housing 5. A control panel 2 is provided on the side wall of the device body 1, and the servo motor 3 is mounted below the control panel 2. A movable groove 7 is provided on the outer wall of the device body 1. The drive shaft of the servo motor 3 extends through the outer wall of the device body 1 into the movable groove 7 and is connected to a bidirectional threaded rod 8. The tensile housing 5 is symmetrically and movably mounted on the outer wall of the bidirectional threaded rod 8 via a threaded sleeve 9. A limit block 10 is provided on the side of the tensile housing 5 away from the threaded sleeve 9. A limit groove 4 is provided on the outer wall of the device body 1. The tensile housing 5... The limit block 10 is movably installed on the outer wall of the main body 1 of the device. An electric cylinder 6 is installed on the side wall of the tension shell 5. The output shaft of the electric cylinder 6 extends through the outer wall of the tension shell 5 to the inside of the tension shell 5 and is connected to a rack 11. A rotating shaft 18 is symmetrically installed inside the tension shell 5. A limit ring 19 is provided on the outer wall of the rotating shaft 18. A gear 14 is movably installed on the rotating shaft 18 through the limit ring 19. The rack 11 and the gear 14 mesh with each other for transmission. A clamping rod 15 is provided on the side wall of the gear 14. A movable block 16 is provided at the end of the clamping rod 15 away from the gear 14. A clamping plate 17 is movably installed on the clamping rod 15 through the movable block 16.

[0027] In this embodiment, the inner wall of the stretching shell 5 is symmetrically provided with grooves 13, and the outer walls on both sides of the rack 11 are symmetrically provided with sliders 12.

[0028] In this embodiment, the cross-section of the slider 12 is rectangular, and the slider 12 matches the groove 13.

[0029] In this embodiment, the outer wall of one side of the clamping plate 17 is rectangular, and rubber pads 20 are evenly provided on the outer wall of the clamping plate 17.

[0030] In this embodiment, tooth blocks are symmetrically arranged on the outer walls on both sides of the rack 11, and the rack 11 is located in the middle of the gear 14.

[0031] In this embodiment, the clamping rod 15 has a J-shaped structure and is welded to the side wall of the gear 14.

[0032] Specific examples Figure 1 , Figure 4 and Figure 5As shown, when using this structure, both ends of the material are placed between the clamping plates 17. The electric cylinder 6 is activated through the control panel 2 to pull the rack 11. The sliding block 12 and the slide groove 13 limit the rack 11, causing the slide groove 13 to move laterally. During the translation, it meshes with the gear 14, driving the gear 14 to rotate. When the gear 14 rotates, it drives the clamping rod 15 to rotate around the center of the gear 14, thereby clamping and fixing the material in the middle of the clamping plates 17. The rubber pad 20 can prevent damage to the outer wall of the material during clamping. At the same time, since the clamping plates 17 are movably installed at the end position of the clamping rod 15 through the clamping rod 15, the movable block 16 can always be in contact with the outer wall of the material during clamping. This structure can provide stable clamping of the material during use and prevent the clamping plates 17 from damaging the outer wall of the material.

[0033] Example 2: The cross-section of the limiting block 10 is trapezoidal, and the limiting groove 4 fits into the limiting block 10.

[0034] In this embodiment, the outer wall of the bidirectional threaded rod 8 is symmetrically provided with external threads in opposite directions, and the inner wall of the threaded sleeve 9 is provided with internal threads that match the external threads.

[0035] Specific examples Figures 1-3 As shown, when using this structure, the servo motor 3 is started to drive the bidirectional threaded rod 8 to rotate. The inner wall of the threaded sleeve 9 is provided with an internal thread that matches the bidirectional threaded rod 8. Since the outer wall of the bidirectional threaded rod 8 is provided with an external thread in the opposite direction, and the tension shell 5 is limited by the limiting groove 4 and the limiting block 10, the tension shell 5 moves laterally to both sides along the movable groove 7 at the same time, so as to perform a tensile test on the material. This structure can stretch both ends of the material at the same time, so that the material is subjected to more uniform force and the test is more accurate.

[0036] Working principle: the two ends of the material are placed between the clamping plates 17, the electric cylinder 6 is started by the control panel 2 to pull the rack 11, the sliding block 12 and the sliding groove 13 are limited to the rack 11, the sliding groove 13 is transversely translated, the gear 14 is engaged and driven in the translation process, the gear 14 is rotated, the clamping rod 15 is rotated around the center of the gear 14, so that the material in the middle of the clamping plate 17 is clamped and fixed, the rubber pad 20 can avoid damage to the outer wall of the material during clamping, at the same time, the clamping plate 17 is movably installed in the port position of the clamping rod 15 through the clamping rod 15, the movable block 16 can always be attached to the outer wall of the material during clamping, after the two ends of the material are clamped, the bidirectional screw rod 8 is rotated by starting the servo motor 3, the inner thread matched with the bidirectional screw rod 8 is arranged on the inner wall of the threaded sleeve 9, the outer thread with opposite direction is arranged on the outer wall of the bidirectional screw rod 8, the stretching shell 5 is limited to move along the movable groove 7 to the two sides at the same time by the limiting groove 4 and the limiting block 10, so as to stretch the material for testing, the device can provide stable clamping for the material, avoid damage to the outer wall of the material by the clamping plate 17, and stretch the material to the two sides at the same time, so that the material is more uniform in stress, and the test is more accurate.

[0037] The above is only a preferred embodiment of the utility model, and is not used to limit the utility model, any modification, equivalent replacement, improvement, etc. within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A material tensile test clamp comprising a device body (1), a servo motor (3) and a tensile housing (5), characterized in that: The side wall of the device body (1) is provided with a control panel (2), the lower side of the control panel (2) is provided with a servo motor (3), the outer wall of the device body (1) is provided with a movable groove (7), the driving shaft of the servo motor (3) extends through the outer wall of the device body (1) and is connected with a two-way threaded rod (8) in the inside of the movable groove (7), the outer wall of the two-way threaded rod (8) is symmetrically movably provided with a stretching shell (5) through a threaded sleeve (9), the side, away from the threaded sleeve (9), of the stretching shell (5) is provided with a limiting block (10), the outer wall of the device body (1) is provided with a limiting groove (4), the stretching shell (5) is movably installed on the outer wall of the device body (1) through the limiting block (10), the side wall of the stretching shell (5) is provided with an electric cylinder (6), the output shaft of the electric cylinder (6) extends through the outer wall of the stretching shell (5) and is connected with a rack (11) in the inside of the stretching shell (5), the inside of the stretching shell (5) is symmetrically provided with a rotating shaft (18), the outer wall of the rotating shaft (18) is provided with a limiting ring (19), the rotating shaft (18) is movably provided with a gear (14) through the limiting ring (19), the rack (11) and the gear (14) are in meshing transmission, the side wall of the gear (14) is provided with a clamping rod (15), one end of the clamping rod (15), away from the gear (14), is provided with a movable block (16), the clamping rod (15) is movably provided with a clamping plate (17) through the movable block (16).

2. A material tensile test clamp according to claim 1, wherein, The inside of the stretching shell (5) is symmetrically provided with a sliding groove (13), the outer wall of the rack (11) is symmetrically provided with a sliding block (12).

3. A material tensile test clamp according to claim 2, wherein, The cross section of the sliding block (12) is rectangular, and the sliding block (12) and the sliding groove (13) are matched with each other.

4. A material tensile test clamp according to claim 2, wherein, The outer wall of one side of the clamping plate (17) is rectangular, and the outer wall of the clamping plate (17) is uniformly provided with a rubber pad (20).

5. A material tensile test clamp according to claim 3, wherein, The cross section of the limiting block (10) is trapezoidal, and the limiting groove (4) and the limiting block (10) are matched with each other.

6. A material tensile test clamp according to claim 5, wherein, The outer wall of the two-way threaded rod (8) is symmetrically provided with outer threads in opposite directions, and the inner wall of the threaded sleeve (9) is provided with inner threads matched with the outer threads.

7. A material tensile test clamp according to claim 6, wherein, The outer wall of the rack (11) is symmetrically provided with a tooth block, and the rack (11) is located at the middle position of the gear (14).

8. A material tensile test clamp according to claim 5, wherein, The clamping rod (15) is J-shaped, and the clamping rod (15) is welded to the side wall of the gear (14).

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