A tensile tester automatic clamping device

Abstract

This utility model relates to an automatic clamping device for a pull-out tester, including a fixed frame and a clamping part. The lower frame of the fixed frame has a sliding groove, in which the clamping part is movably connected. The clamping part includes a left clamping plate and a right clamping plate, which are arranged opposite to each other and can move along the sliding groove within the fixed frame. A first airbag is provided on the inner surface of the left and right clamping plates, and grippers are connected to the sides of the left and right clamping plates. When a specimen is placed in the fixed frame between the left and right clamping plates, the left and right clamping plates are driven to move closer together to clamp the specimen. The first airbag is inflated to position the specimen, and the grippers simultaneously clamp the specimen, further securing it firmly. The beneficial effects of this utility model are: automation and more stable clamping, avoiding slippage or deformation of the specimen due to excessively tight or loose clamping.

Description

Technical Field

[0001] This utility model relates to the technical field of clamping devices for pull-out instruments, and in particular to an automatic clamping device for pull-out instruments. Background Technology

[0002] A drawing machine is a device used to draw metal materials. It is used to process metal specimens at room temperature and typically consists of mechanical equipment, lubrication equipment, and hydraulic and pneumatic systems. Currently, when using materials such as steel bars for engineering construction, it is necessary to perform drawing tests on the steel bars. However, the current tensile testing process has significant limitations in the clamping stability of the metal specimen, making it difficult to guarantee error-free testing. Current clamping equipment usually clamps the steel bars by rotating the threaded column through the handle, which is highly dependent on manual labor, resulting in low work efficiency. Furthermore, due to manual clamping, and the high strength of the metal specimen, it is easy to apply relatively large forces during the drawing process. Insufficient clamping can cause the specimen to slip out, while excessive clamping can cause the specimen to deform.

[0003] Therefore, based on customer feedback regarding the shortcomings of the existing structure, the inventors made further improvements to overcome the aforementioned problems. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide an automated clamping device for a pull-out instrument that is more stable and avoids slippage or deformation of the specimen due to excessively tight or loose clamping.

[0005] The purpose of this utility model is achieved through the following technical solution: an automatic clamping device for a drawing instrument, characterized in that it includes a fixed frame and a clamping part;

[0006] The lower frame of the fixed frame has a sliding groove, and a clamping part is movably connected in the sliding groove. The clamping part includes a left clamping plate and a right clamping plate. The left and right clamping plates are arranged opposite to each other and can move along the sliding groove within the fixed frame. The inner surfaces of the left and right clamping plates are provided with a first airbag, and the sides of the left and right clamping plates are connected with grippers.

[0007] The specimen is placed in the fixed frame and positioned between the left and right clamping plates. The left and right clamping plates are driven to move closer to each other until the specimen is clamped. The first airbag is inflated to position the specimen, and the grippers clamp the specimen, further securing it firmly.

[0008] As a preferred technical solution of this application, the slide groove in the fixed frame includes two slides; the slides are opened from the left end face to the right end face of the fixed frame, and lead screw A and lead screw B are connected in the two slides respectively. Lead screw A and lead screw B are connected to motor A and motor B respectively. A left clamping plate is sleeved on lead screw A, and a right clamping plate is sleeved on lead screw B.

[0009] As a preferred technical solution of this application, the motors A and B drive their connected lead screws to rotate in opposite directions, thereby causing the left clamping plate and the right clamping plate to move relative to each other.

[0010] As a preferred technical solution of this application, multiple positioning posts are formed on the surface of the first airbag, the multiple positioning posts are arranged at equal intervals, and the positioning posts abut against the surface of the specimen after the first airbag is inflated.

[0011] As a preferred technical solution of this application, the gripper is provided with a second airbag facing the inner surface of the specimen. When the two clamping plates move relative to each other to clamp the specimen, the gripper simultaneously clamps the specimen, and the second airbag inflates to further position the specimen.

[0012] As a preferred technical solution of this application, the fixed frame includes an upper frame and a lower frame; the upper frame and the lower frame are connected by a cylinder mechanism, and cylinders are respectively connected to the left and right sides of the lower frame. The cylinders extend vertically upward from the cylinder shaft, and the end of the cylinder shaft is connected to the lower surface of the upper frame. Thus, when the cylinder shaft is extended or shortened, the upper frame moves in the vertical direction to adapt to the height of the specimen.

[0013] As a preferred technical solution of this application, the inner frame of the fixed frame is connected to a limiting rod from left to right. The limiting rod is set parallel to the lower end face of the fixed frame and passes through the left clamping plate and the right clamping plate, so that the left and right clamping plates can only move in the left and right directions.

[0014] This utility model has the following advantages:

[0015] (1) This scheme achieves automated clamping by setting a screw mechanism to drive the relative displacement of the two clamping plates. Compared with the current method of clamping metal parts such as steel bars by tightening bolts, it further reduces the probability of metal specimens loosening after being clamped. Automated clamping also improves the overall work efficiency.

[0016] (2) This solution sets up an airbag structure that works in conjunction with the clamping plate and the gripper. Through the flexible support and positioning effect of the airbag structure, the metal specimen is effectively clamped, avoiding the situation where the specimen slips out of the equipment or is damaged due to excessive or insufficient clamping force during the pull-out test. Attached Figure Description

[0017] Figure 1 This is a first-view structural schematic diagram of the present invention;

[0018] Figure 2 This is a structural schematic diagram of the present invention from a top-down sectional view.

[0019] Figure 3This is a schematic diagram of the structure of this utility model from a side sectional view.

[0020] Figure 4 This is a schematic diagram of the structure of the clamping plate and lead screw mechanism after installation.

[0021] Figure 5 This is a structural schematic diagram of the present invention from a downward viewing angle;

[0022] In the diagram: 1-slide rail, 2-lead screw A, 3-lead screw B, 4-left clamping plate, 5-right clamping plate, 6-gripper, 7-first airbag, 8-second airbag, 9-positioning post, 10-upper frame, 11-lower frame, 12-limiting rod. Detailed Implementation

[0023] The present invention will be further described below with reference to the accompanying drawings, but the scope of protection of the present invention is not limited to the following description.

[0024] It should be noted that the orientation or positional relationship indicated by terms such as "left" and "right" is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship that the product of this invention is usually placed in during use, or the orientation or positional relationship that is commonly understood by those skilled in the art. Such terms are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0025] It should be noted that, unless otherwise specified, the embodiments and features and technical solutions in the present invention can be combined with each other.

[0026] Therefore, based on the above issues, please refer to Figure 1 This utility model proposes an automatic clamping device for a pull-out apparatus to solve the problem.

[0027] See Figures 1-5 The automatic clamping device for a drawing machine proposed in this embodiment includes a fixed frame, a slide groove, and a clamping part;

[0028] Among them, see Figure 1 and Figure 5 The fixed frame has two sliding grooves from left to right, and the clamping part is movably connected in the sliding grooves. The clamping part consists of a left clamping plate 4 and a right clamping plate 5. The left and right clamping plates 5 can move relative to each other, and a first airbag 7 is provided on the opposite surface of the left and right clamping plates 5. The metal specimen clamped between the left and right clamping plates 5 is fixed by inflating the first airbag 7.

[0029] Among them, see Figure 1 and Figure 2The left clamping plate 4 has a clamping claw 6 structure connected to its side, and a clamping claw 6 structure is also connected to the opposite side of the right clamping plate 5. The clamping claw 6 structure further clamps and holds the specimen, making it upright and securely supported.

[0030] During operation, the specimen is first installed in the fixed frame of the automatic clamping device, and the specimen is located between the left and right clamping plates 5. The first airbag 7 is inflated so that the first airbag 7 positions the specimen and drives the left clamping plate 4 and the right clamping plate 5 to move closer to each other until the specimen is clamped. The specimen is then clamped by the gripper 6.

[0031] Current clamping devices typically clamp reinforcing bars by rotating a threaded column with a handle. This method is highly manual, resulting in low work efficiency. Furthermore, manual clamping can easily lead to the application of excessive force during the pulling process. Insufficient clamping can cause the specimen to slip out, while excessive clamping can cause the specimen to deform. Therefore, this solution designs an automatic clamping device that moves the left and right clamping plates 5 in the fixed frame closer together to clamp the specimen. Then, the first airbag 7 and the gripper 6 work together to make the specimen more securely clamped. The clamping force can be adjusted by changing the first airbag 7 to strengthen or loosen the clamping force, thereby clamping the metal specimen more stably.

[0032] In this embodiment, see Figures 1-3 and Figure 5 For the fixed frame, two sliding grooves (i.e., two slides 1) are opened in the lower frame 11 of the fixed frame. The two slides 1 are opened from the left end to the right end of the lower frame 11. Screws A2 and B3 are respectively connected in the slides 1. Screws A2 and B3 are rotatably set in the slides 1. Screw A2 is connected to motor A, and screw B3 is connected to motor B. A left clamping plate 4 is sleeved on screw A2 (the left clamping plate 4 is perpendicular to screw A2), and a right clamping plate 5 is sleeved on screw B3. A first airbag 7 is set on the opposite surface of the left and right clamping plates 5. Multiple positioning posts 9 are opened on the surface of the first airbag 7. The multiple positioning posts 9 are equally spaced. After the first airbag 7 is inflated, the positioning posts 9 abut against the surface of the specimen to further fix and clamp the specimen.

[0033] Furthermore, since motors A and B drive lead screws A2 and B3 to rotate in opposite directions, they cause the left clamping plate 4 and the right clamping plate 5 to move relative to each other.

[0034] Furthermore, the lower ends of the left clamping plate 4 and the right clamping plate 5 are provided with mounting holes, and the mounting holes are provided with internal threads that are compatible with the external threads on the lead screws A2 and B3.

[0035] In this embodiment, see Figure 2 and Figure 3For the gripper 6, the gripper 6 is connected to the left and right clamping plates 5 via the connecting column. The recess of the gripper 6 is set facing the specimen, and the inner surface of the recess of the gripper 6 is provided with a second airbag 8. When the drive motor makes the lead screw rotate, the left and right connecting plates are relatively displaced. Therefore, the gripper 6 approaches the specimen and clamps the specimen. When the second airbag 8 is inflated, the inflated part abuts against the gap of the specimen, further clamping the specimen.

[0036] It should be noted that by inflating and deflating the first airbag 7 and the second airbag 8, the specimen is flexibly supported and clamped, avoiding the uneven clamping force caused by manually tightening bolts or lever locking in the current general situation, which may damage the specimen or cause some problems.

[0037] Furthermore, a pressure sensor is installed inside the gripper 6. The pressure sensor can transmit feedback of the clamping force and make adaptive adjustments to avoid damage to the specimen.

[0038] In this embodiment, see Figure 3 For the fixed frame, multiple limiting rods 12 are connected to the lower part of the inner frame of the fixed frame. The multiple limiting rods 12 are set parallel to the fixed frame (and the multiple limiting rods 12 are located on the same horizontal plane). The multiple limiting rods 12 pass through the left clamping plate 4 and the right clamping plate 5, so that the left and right clamping plates 5 can only move horizontally. The fixed frame is composed of an upper frame 10 and a lower frame 11, and the upper frame 10 and the lower frame 11 are connected by a cylinder mechanism. Cylinders are connected to the left and right sides of the lower frame 11, and the cylinder shaft extends vertically upward and the end of the cylinder shaft is connected to the lower surface of the upper frame 10. When the driving cylinder extends or retracts the cylinder shaft, it drives the upper frame 10 to move vertically, thereby adapting to the height of the specimen, so that the equipment can be used to test specimens of more sizes.

[0039] The metal part to be tested is installed in the fixed frame (between the left clamping plate 4 and the right clamping plate 5). The drive motors A and B cause the lead screws A2 and B to rotate, thereby causing the connected left clamping plate 4 and right clamping plate 5 to move relative to each other and clamp the test piece. The gripper 6 also approaches the test piece and clamps it. At this time, the first airbag 7 and the second airbag 8 are inflated to further stabilize the metal test piece.

[0040] Because the metal parts are clamped manually, when a large pulling force is applied to the metal specimen, insufficient clamping can cause the specimen to slip out, affecting the normal operation of the work. When the clamping is too tight, the applied force may cause the specimen to deform. Therefore, this solution designs a fixed frame with movable upper and lower frames to accommodate specimens of various heights. A clamping plate that can be relatively displaced by a screw mechanism is set in the fixed frame. The clamping plate initially clamps the specimen. At the same time, the second airbag 8 of the first airbag 7 and the gripper 6 further clamps the specimen during the contact and abutment with the metal parts, thus avoiding damage to the specimen.

[0041] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A tensile apparatus automated gripping device, characterized by: Includes a fixed frame and a clamping part; The lower frame (11) of the fixed frame has a sliding groove, and a clamping part is movably connected in the sliding groove. The clamping part includes a left clamping plate (4) and a right clamping plate (5). The left and right clamping plates are arranged opposite to each other and can move along the sliding groove in the fixed frame. The inner surfaces of the left clamping plate (4) and the right clamping plate (5) are provided with a first airbag (7), and grippers (6) are connected to the sides of the left and right clamping plates. The specimen is placed in the fixed frame and positioned between the left and right clamping plates. The left clamping plate (4) and the right clamping plate (5) are driven to move closer to each other until the specimen is clamped. The first airbag (7) is inflated so that the first airbag (7) positions the specimen. At the same time, the gripper (6) clamps the specimen, further securing the specimen.

2. The automatic clamping device of a tensilometer according to claim 1, characterized in that: The slide groove in the fixed frame includes two slides (1); the slides (1) are opened from the left end face to the right end face of the fixed frame. The two slides (1) are respectively connected to lead screw A (2) and lead screw B (3). Lead screw A (2) and lead screw B (3) are respectively connected to motor A and motor B. A left clamping plate (4) is sleeved on lead screw A (2), and a right clamping plate (5) is sleeved on lead screw B (3).

3. The automatic gripping device of a tensile apparatus according to claim 2, characterized in that: The motors A and B drive their connected lead screws to rotate in opposite directions, thereby causing the left clamping plate (4) and the right clamping plate (5) to move relative to each other.

4. The automatic clamping apparatus of a tensile meter according to claim 1, wherein: Multiple positioning posts (9) are provided on the surface of the first airbag (7). The multiple positioning posts (9) are arranged at equal intervals, and the positioning posts (9) abut against the surface of the specimen after the first airbag (7) is inflated.

5. The automatic clamping device for a drawing machine according to claim 1, characterized in that: The gripper (6) is provided with a second airbag (8) facing the inner surface of the specimen. When the two clamping plates move relative to each other to clamp the specimen, the gripper (6) clamps the specimen at the same time, and the second airbag (8) inflates to further position the specimen.

6. The automatic clamping apparatus of a tensile meter according to claim 2, wherein: The fixed frame includes an upper frame (10) and a lower frame (11); the upper frame (10) and the lower frame (11) are connected by a cylinder mechanism. The left and right sides of the lower frame (11) are respectively connected to cylinders. The cylinders extend vertically upwards from the cylinder shaft, and the end of the cylinder shaft is connected to the lower surface of the upper frame (10). When the cylinder shaft is extended or shortened, the upper frame (10) is moved in the up and down direction to adapt to the height of the specimen.

7. The automatic gripping apparatus of a tensile tester according to claim 6, wherein: The inner frame of the fixed frame is connected to a limiting rod (12) from left to right. The limiting rod (12) is set parallel to the lower end face of the fixed frame and passes through the left clamping plate (4) and the right clamping plate (5), so that the left clamping plate (4) and the right clamping plate (5) can only move in the left and right directions.

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