Workpiece fixing device of universal testing machine

Abstract

The utility model belongs to the technical field of universal testing machine workpiece fixing, and particularly relates to a universal testing machine workpiece fixing device which comprises a base, a plurality of rod grooves are formed in the inner wall of a front plate of a clamping block, positioning rods are installed in the rod grooves, a second lead screw is rotatably installed on the inner wall of a lifting groove, and a clamping block is installed on the lifting groove. The lifting block is fixedly connected with the side walls of the multiple positioning rods, multiple rod holes are formed in the clamping block front plate, sliding rods penetrate through the rod holes, the two sets of clamping blocks move towards the irregular workpiece, the irregular workpiece is surrounded by the sliding rods on the two sets of clamping blocks, then a second rotary knob is rotated to drive a second lead screw to rotate, and the irregular workpiece is clamped through the second lead screw. The second lead screw drives a lifting block on the second lead screw to vertically move downwards, the lifting block drives a plurality of positioning rods to vertically move downwards, the positioning rods press and fix sliding rods on the bottom sides of the positioning rods, positioning of the sliding rods is achieved, and therefore the two sets of clamping blocks clamp and fix irregular workpieces through the sliding rods, and the adaptability of the fixing device is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of workpiece fixing of universal testing machines, and specifically relates to a workpiece fixing device for a universal testing machine. Background Technique

[0002] A universal testing machine is a material testing machine integrating functions such as tension, bending, compression, shear, and ring stiffness, and is mainly used for mechanical property tests of metal and non-metal materials. A fixing device is required to clamp and fix the workpiece during the test.

[0003] A Chinese patent with the publication number CN217561125U discloses a hydraulic fixture for a universal testing machine, which includes a support base. Two chutes are provided at the middle position of the top of the support base. Two clamping bases are respectively clamped at both ends of the inner walls of the two chutes. A limiting shaft is inserted through the middle position of one side of the two clamping bases. Card slots are provided at the middle positions of one side of the two limiting shafts. In this utility model, one of the clamping bases is fixed to the hydraulic rods at the upper ends of the two support blocks, and the other clamping base is adjusted to a proper position and fixed in the chute through a fixing shaft and a fixing piece. Then, according to the type of the workpiece, one of the clamping bases is moved, and some workpieces can be squeezed and fixed by the two limiting shafts at its upper end. Sheet workpieces can be clamped and fixed through the card slots and fixing bolts. Moreover, by rotating the rotating handle on one side, the angle of the workpiece can be changed, which is convenient for the normal operation of the testing machine processing, thereby improving the practicability of the device.

[0004] During the process of clamping and fixing the workpiece by the existing fixing device of the universal testing machine, due to the small contact area between the clamping plate and the irregular workpiece, it is difficult to clamp and fix the irregular workpiece, resulting in poor adaptability of the fixing device. Therefore, a workpiece fixing device for a universal testing machine is proposed to solve the above problems. Content of the Utility Model

[0005] In order to make up for the deficiencies of the prior art and solve the problems existing in the prior art, the utility model proposes a workpiece fixing device for a universal testing machine.

[0006] The technical solution adopted by the present utility model to solve its technical problems is as follows: A workpiece fixing device for a universal testing machine according to the present utility model includes a base, on which a placing table is installed. A sliding groove is provided on the placing table, and two groups of sliders are symmetrically assembled in the sliding groove. A sliding plate is installed on the slider, and a clamping block is installed on the sliding plate. An assembly groove is provided inside the clamping block, and a plurality of rod grooves are provided on the inner wall of the front plate of the clamping block. A positioning rod is installed in the rod groove, and a plurality of positioning grooves are provided on the positioning rod. Two groups of lifting grooves are symmetrically provided inside the clamping block, and a second lead screw is rotatably installed on the inner wall of the lifting groove. The top side of the second lead screw penetrates through the top plate of the clamping block and is welded with a second knob. A lifting block is assembled in the lifting groove, and the lifting block is fixedly connected to the side walls of a plurality of positioning rods. The lifting block is sleeved around the second lead screw and slides in cooperation with the second lead screw through threads. A plurality of rod holes are provided on the front plate of the clamping block, and a sliding rod penetrates through the rod holes. A limiting block is installed on the sliding rod. A first lead screw is rotatably installed on the inner wall of the sliding groove, and the thread directions of the first lead screw are symmetrically opposite. One side of the first lead screw penetrates through the side wall of the placing table and is welded with a first knob. The first lead screw penetrates through the slider, and the slider slides in cooperation with the first lead screw through threads. By moving two groups of clamping blocks towards the irregular workpiece, the irregular workpiece is surrounded by the sliding rods on the two groups of clamping blocks. Then, the second knob is rotated to drive the second lead screw to rotate. The second lead screw drives the lifting block on it to move vertically downward. The lifting block drives a plurality of positioning rods to move vertically downward. The positioning rods press and fix the sliding rod at their bottom sides, realizing the positioning of the sliding rod. Therefore, the two groups of clamping blocks clamp and fix the irregular workpiece through the sliding rod, which is beneficial to improving the adaptability of the fixing device.

[0007] Preferably, a connecting groove is provided on the inner wall of the assembly groove, a connecting block is assembled in the connecting groove, a moving plate is installed on the connecting block, and the moving plate is slidably assembled in the assembly groove. A groove is provided on the top plate of the clamping block, and a pushing block is assembled in the groove. The pushing block is fixedly connected to the moving plate. By pushing the pushing block, the pushing block drives the moving plate to move. The moving plate pushes the sliding rod on the clamping block to move, so that the limiting block on the sliding rod is attached to the inner wall of the assembly groove, realizing the neat reset of the sliding rod, facilitating the next clamping use, and being beneficial to improving the reuse rate.

[0008] The beneficial effects of the present utility model are as follows:

[0009] 1. By moving two groups of clamping blocks towards the irregular workpiece, the irregular workpiece is surrounded by the sliding rods on the two groups of clamping blocks. Then, the second knob is rotated to drive the second lead screw to rotate. The second lead screw drives the lifting block on it to move vertically downward. The lifting block drives a plurality of positioning rods to move vertically downward. The positioning rods press and fix the sliding rod at their bottom sides, realizing the positioning of the sliding rod. Therefore, the two groups of clamping blocks clamp and fix the irregular workpiece through the sliding rod, which is beneficial to improving the adaptability of the fixing device.

[0010] 2. The utility model realizes the neat return of the sliding rod by pushing the push block, which drives the moving plate to move, and the moving plate pushes the sliding rod on the clamping block to move, so that the limiting block on the sliding rod is attached to the inner wall of the assembly groove, facilitating the next clamping use and improving the reuse rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following-described drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0012] Figure 1 is the first - perspective three - dimensional structure diagram;

[0013] Figure 2 is the three - dimensional structure diagram of the placing table;

[0014] Figure 3 is the three - dimensional structure diagram at the positioning rod;

[0015] Figure 4 is the three - dimensional structure diagram at the sliding rod;

[0016] Figure 5 is the three - dimensional structure diagram at the moving plate.

[0017] In the figure: 1, base; 2, placing table; 3, sliding groove; 4, first lead screw; 5, first knob; 6, slider; 7, sliding plate; 8, clamping block; 9, assembly groove; 10, rod groove; 11, positioning rod; 12, positioning groove; 13, lifting groove; 14, second lead screw; 15, second knob; 16, rod hole; 17, sliding rod; 18, limiting block; 19, connecting groove; 20, connecting block; 21, moving plate; 22, groove; 23, push block; 24, lifting block. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0018] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of them. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present utility model.

[0019] Please refer to Figures 1-5As shown in the figure, a workpiece fixing device for a universal testing machine includes a base 1. A placing table 2 is installed on the base 1. A sliding groove 3 is formed on the placing table 2. Two groups of sliding blocks 6 are symmetrically assembled in the sliding groove 3. A sliding plate 7 is installed on the sliding block 6. A clamping block 8 is installed on the sliding plate 7. An assembly groove 9 is formed inside the clamping block 8. A plurality of rod grooves 10 are formed on the inner wall of the front plate of the clamping block 8. A positioning rod 11 is installed in the rod groove 10. A plurality of positioning grooves 12 are formed on the positioning rod 11. Two groups of lifting grooves 13 are symmetrically formed inside the clamping block 8. A second lead screw 14 is rotatably installed on the inner wall of the lifting groove 13. The top side of the second lead screw 14 penetrates through the top plate of the clamping block 8 and is welded with a second knob 15. A lifting block 24 is assembled in the lifting groove 13. The lifting block 24 is fixedly connected to the side walls of a plurality of positioning rods 11. The lifting block 24 is sleeved around the second lead screw 14 and is in sliding fit with the second lead screw 14 through threads. A plurality of rod holes 16 are formed on the front plate of the clamping block 8. A sliding rod 17 penetrates through the rod hole 16. A limiting block 18 is installed on the sliding rod 17. A first lead screw 4 is rotatably installed on the inner wall of the sliding groove 3. The thread directions of the first lead screw 4 are symmetrically opposite. One side of the first lead screw 4 penetrates through the side wall of the placing table 2 and is welded with a first knob 5. The first lead screw 4 penetrates through the sliding block 6. The sliding block 6 is in sliding fit with the first lead screw 4 through threads. A connecting groove 19 is formed on the inner wall of the assembly groove 9. A connecting block 20 is assembled in the connecting groove 19. A moving plate 21 is installed on the connecting block 20. The moving plate 21 is slidably assembled in the assembly groove 9. A groove 22 is formed on the top plate of the clamping block 8. A pushing block 23 is assembled in the groove 22. The pushing block 23 is fixedly connected to the moving plate 21. During operation, in the process of clamping and fixing a workpiece by the existing fixing device of a universal testing machine, since the contact area between the clamping plate and the irregular workpiece is small, it is difficult to clamp and fix the irregular workpiece, resulting in poor adaptability of the fixing device. By placing the irregular workpiece on the placing table 2 and rotating the first knob 5, the first lead screw 4 is driven to rotate. The first lead screw 4 drives the two groups of sliding blocks 6 on it to move relatively synchronously. The two groups of sliding blocks 6 drive the two groups of sliding plates 7 to move relatively synchronously. The two groups of sliding plates 7 drive the two groups of clamping blocks 8 to move relatively synchronously. The two groups of clamping blocks 8 move towards the irregular workpiece. During the moving process, the sliding rod 17 on the clamping block 8 contacts the irregular workpiece. The irregular workpiece pushes the sliding rod 17 into the clamping block 8 according to its own shape. At this time, the irregular workpiece is surrounded by the sliding rods 17 on the two groups of clamping blocks 8;

[0020] At this time, rotate the two groups of second knobs 15 on the clamping block 8. The second knobs 15 drive the second lead screw 14 to rotate. The second lead screw 14 drives the lifting block 24 on it to move vertically downward. The lifting block 24 drives a plurality of positioning rods 11 to move vertically downward. The positioning rods 11 press and fix the sliding rod 17 at its bottom side, realizing the positioning of the sliding rod 17. The sliding rod 17 changes from a sliding state to a fixed state. Therefore, the two groups of clamping blocks 8 clamp and fix the irregular workpiece through the sliding rods 17;

[0021] When disassembling an irregular workpiece, by rotating the first knob 5 in the reverse direction, two groups of clamping blocks 8 are driven to move synchronously and in opposite directions. The sliding rods 17 on the two groups of clamping blocks 8 no longer clamp the irregular workpiece, realizing the disassembly of the irregular workpiece. Then, by pushing the push block 23, the push block 23 drives the moving plate 21 to move, and the moving plate 21 pushes the sliding rod 17 on the clamping block 8 to move, so that the limiting block 18 on the sliding rod 17 is in contact with the inner wall of the assembly groove 9, realizing the neat return of the sliding rod 17, which is convenient for the next clamping use; this structure can clamp and fix the irregular workpiece through the sliding rod 17, which is beneficial to improving the adaptability of the fixing device.

[0022] Working principle: In the process of clamping and fixing a workpiece by the existing fixing device of a universal testing machine, since the contact area between the clamping plate and the irregular workpiece is small, it is difficult to clamp and fix the irregular workpiece, resulting in poor adaptability of the fixing device. By placing the irregular workpiece on the placing table 2 and rotating the first knob 5, the first lead screw 4 is driven to rotate. The first lead screw 4 drives two groups of sliders 6 on it to move synchronously and relatively. The two groups of sliders 6 drive two groups of sliding plates 7 to move synchronously and relatively. The two groups of sliding plates 7 drive two groups of clamping blocks 8 to move synchronously and relatively. The two groups of clamping blocks 8 move towards the irregular workpiece. During the movement, the sliding rod 17 on the clamping block 8 contacts the irregular workpiece, and the irregular workpiece pushes the sliding rod 17 into the clamping block 8 according to its own shape. At this time, the irregular workpiece is surrounded by the sliding rods 17 on the two groups of clamping blocks 8; at this time, rotate two groups of second knobs 15 on the clamping block 8. The second knob 15 drives the second lead screw 14 to rotate. The second lead screw 14 drives the lifting block 24 on it to move vertically downward. The lifting block 24 drives a plurality of positioning rods 11 to move vertically downward. The positioning rods 11 press and fix the sliding rod 17 on its bottom side, realizing the positioning of the sliding rod 17. The sliding rod 17 changes from a sliding state to a fixed state. Therefore, the two groups of clamping blocks 8 clamp and fix the irregular workpiece through the sliding rod 17; when disassembling the irregular workpiece, by rotating the first knob 5 in the reverse direction, two groups of clamping blocks 8 are driven to move synchronously and in opposite directions. The sliding rods 17 on the two groups of clamping blocks 8 no longer clamp the irregular workpiece, realizing the disassembly of the irregular workpiece. Then, by pushing the push block 23, the push block 23 drives the moving plate 21 to move, and the moving plate 21 pushes the sliding rod 17 on the clamping block 8 to move, so that the limiting block 18 on the sliding rod 17 is in contact with the inner wall of the assembly groove 9, realizing the neat return of the sliding rod 17, which is convenient for the next clamping use; this structure can clamp and fix the irregular workpiece through the sliding rod 17, which is beneficial to improving the adaptability of the fixing device.

[0023] The foregoing has shown and described the basic principles, main features and advantages of the present utility model. Those skilled in the art should understand that the present utility model is not limited by the above embodiments, and what is described in the above embodiments and the specification only illustrates the principles of the present utility model. Without departing from the spirit and scope of the present utility model, the present utility model will have various changes and improvements, and all these changes and improvements fall within the scope of the present utility model claimed.

Claims

1. A workpiece fixing device for a universal testing machine, characterized in that: It includes a base (1), a placing table (2) is installed on the base (1), a sliding groove (3) is formed on the placing table (2), two groups of sliders (6) are symmetrically assembled in the sliding groove (3), a sliding plate (7) is installed on the slider (6), a clamping block (8) is installed on the sliding plate (7), an assembly groove (9) is formed inside the clamping block (8), a plurality of rod grooves (10) are formed on the inner wall of the front plate of the clamping block (8), a positioning rod (11) is installed in the rod groove (10), a plurality of positioning grooves (12) are formed on the positioning rod (11), two groups of lifting grooves (13) are symmetrically formed inside the clamping block (8), a second lead screw (14) is rotatably installed on the inner wall of the lifting groove (13), the top side of the second lead screw (14) penetrates through the top plate of the clamping block (8) and is welded with a second knob (15), a lifting block (24) is assembled in the lifting groove (13), the lifting block (24) is fixedly connected with the side walls of a plurality of positioning rods (11), the lifting block (24) is sleeved around the second lead screw (14) and is slidably matched with the second lead screw (14) through threads, a plurality of rod holes (16) are formed on the front plate of the clamping block (8), a sliding rod (17) penetrates through the rod hole (16), and a limiting block (18) is installed on the sliding rod (17).

2. The workpiece fixing device of a universal testing machine according to claim 1, wherein: A first lead screw (4) is rotatably installed on the inner wall of the sliding groove (3), and the thread directions of the first lead screw (4) are symmetrically opposite.

3. The workpiece fixing device of a universal testing machine according to claim 2, characterized in that: One side of the first lead screw (4) penetrates through the side wall of the placing table (2) and is welded with a first knob (5), the first lead screw (4) penetrates through the slider (6), and the slider (6) is slidably matched with the first lead screw (4) through threads.

4. The workpiece fixing device of a universal testing machine according to claim 1, characterized in that: A connecting groove (19) is formed on the inner wall of the assembly groove (9), and a connecting block (20) is assembled in the connecting groove (19).

5. The workpiece fixing device of a universal testing machine according to claim 4, characterized in that: A moving plate (21) is installed on the connecting block (20), and the moving plate (21) is slidably assembled in the assembly groove (9).

6. The workpiece fixing device of a universal testing machine according to claim 1, characterized in that: A groove (22) is formed on the top plate of the clamping block (8), a pushing block (23) is assembled in the groove (22), and the pushing block (23) is fixedly connected with the moving plate (21).

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