Hydraulic clamp adjusting device in tensile testing machine

Abstract

The utility model provides a hydraulic clamp adjusting device in a tensile testing machine, which is used for finely adjusting an upper hydraulic clamp up and down, the hydraulic clamp adjusting device comprises a gear motor, a chain wheel, a nut sleeve and a lead screw, the gear motor and the chain wheel are arranged on the upper surface of a movable cross beam, the gear motor is in transmission connection with the chain wheel, and the chain wheel is provided with a central hole; the nut sleeve is rotationally arranged in the movable cross beam and coaxially fixed to the lower end face of the chain wheel, the lead screw is in threaded connection with the nut sleeve, and the upper hydraulic clamp is fixedly installed at the bottom of the lead screw. The gear motor is used for driving the chain wheel and the nut sleeve, the nut sleeve rotates to drive the lead screw to move up and down, and therefore the position of the upper hydraulic clamp at the lower end of the lead screw is adjusted, and the position of the hydraulic clamp is adjusted safely and accurately. A traditional testing machine can only utilize a loading oil cylinder to lift and move a cross beam to drive a hydraulic clamp to adjust the position. By means of the device, test sample fixing is safer and more accurate, and social requirements can be better met.

Description

Technical Field

[0001] The utility model relates to a hydraulic universal testing machine, in particular to a hydraulic clamp adjusting device in a tensile testing machine. Background Art

[0002] The hydraulic universal testing machine, as a multifunctional material testing tool, plays an indispensable role in the mechanical property testing of metal and non-metal materials. It not only shows a wide range of applicability in the fields of construction, machinery manufacturing and technical monitoring, but is also a powerful assistant in the mechanical laboratories of scientific research institutions and colleges and universities. On this advanced equipment, the mechanical property parameters of various materials can be accurately and comprehensively measured.

[0003] However, in actual operation, adjusting the position of the hydraulic fixture to stabilize the specimen becomes a critical but tricky step. The traditional hydraulic universal testing machine drives the hydraulic fixture up and down by lifting and lowering the loading cylinder. This process is cumbersome and difficult to ensure the precise fixation of the specimen. This not only affects the safety of the test, but also greatly reduces the accuracy of the results. Therefore, there is an urgent need for a new hydraulic universal testing machine that can safely and conveniently adjust the fixture position and accurately fix the specimen on the hydraulic fixture to meet the needs of modern scientific research and experiments. Utility Model Content

[0004] The purpose of the utility model is to provide a device for adjusting the position of the hydraulic clamp of the testing machine in the tensile test, which can meet the requirements of safely adjusting the position of the clamp in the testing machine and accurately fixing the sample on the hydraulic clamp. At the same time, the tensile test space of this device is large, making this new universal testing machine model have advantages in many fields such as construction, machinery and equipment monitoring. The specific plan is as follows:

[0005] A hydraulic fixture adjustment device in a tensile testing machine, the tensile testing machine is provided with a lower base and an upper top beam located parallel to the lower base, the lower base and the upper top beam are fixedly connected by a plurality of guide columns, a movable crossbeam which cooperates with the guide columns to slide up and down is installed between the upper top beams above the lower base, a loading oil cylinder for driving the movable crossbeam to slide is installed on the lower base, a load sensor and a lower hydraulic fixture are installed on the upper surface of the lower base, and the load sensor is installed between the upper surface of the lower base and the lower hydraulic fixture,

[0006] The hydraulic clamp adjustment device is used for fine-tuning the upper hydraulic clamp up and down. The hydraulic clamp adjustment device includes a reduction motor, a sprocket, a nut sleeve and a lead screw. The reduction motor and the sprocket are installed on the upper surface of the moving beam. The reduction motor is connected to the sprocket for transmission. The sprocket is provided with a center hole. The nut sleeve is rotatably arranged in the moving beam and coaxially fixed on the lower end surface of the sprocket. The lead screw is threadedly connected to the nut sleeve, and the upper hydraulic clamp is fixedly installed at the bottom of the lead screw.

[0007] Furthermore, the nut sleeve is a T-shaped sleeve.

[0008] The moving crossbeam is provided with a through hole for installing the nut sleeve, and there are two upper and lower annular steps in the through hole. The upper annular step is used to support the T-shaped sleeve.

[0009] A limiting ring is fixed on the outer edge of the nut sleeve at the bottom of the moving crossbeam, and the upper end surface of the limiting ring is in contact with the lower surface of the moving crossbeam.

[0010] Furthermore, bearings are provided between the upper annular step and the T-shaped sleeve, and between the limiting ring and the lower annular step.

[0011] Furthermore, a circle of threaded holes is provided on the upper end surface of the T-shaped sleeve;

[0012] The sprocket is provided with a circle of through holes around the central hole, and the sprocket is fixed on the upper end surface of the T-shaped sleeve by screws.

[0013] Furthermore, the reduction motor is in transmission connection with the sprocket through a conveyor belt.

[0014] Furthermore, the lead screw is provided with upper and lower limiting convex rings, and the nut sleeve is located between the upper and lower limiting convex rings, and the upper and lower movement ranges of the lead screw are limited by the two limiting convex rings.

[0015] The utility model drives the sprocket and the nut sleeve by a reduction motor. The rotation of the nut sleeve drives the lead screw to move up and down, so as to adjust the position of the upper hydraulic fixture at the lower end of the lead screw, so as to safely and accurately adjust the position of the hydraulic fixture, and fix the specimen on the upper and lower hydraulic fixtures, and finally complete various tests. Different from the traditional testing machine, only the loading oil cylinder can be used to lift and lower the moving crossbeam to drive the hydraulic fixture to adjust the position. With the device of this application, the test to fix the specimen is safer and more accurate, the test space is large, and it can better meet the social needs. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0017] Figure 1 It is a schematic structural diagram of a hydraulic fixture adjustment device in a tensile testing machine of the present invention;

[0018] Figure 2 For Figure 1 partial structural diagram. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present utility model. However, it will be apparent to one of ordinary skill in the art that the present utility model may be practiced without one or more of these details. In other instances, some well-known technical features are not described in order to avoid obscuring the present utility model.

[0020] To thoroughly understand the present utility model, detailed steps and structures will be presented in the following description to illustrate the technical solution of the present utility model. The preferred embodiments of the present utility model are described in detail below. However, in addition to these detailed descriptions, the present utility model may have other embodiments.

[0021] Referring to Figure 1-2 As shown, the present utility model provides a hydraulic fixture adjustment device in a tensile testing machine. The tensile testing machine is provided with a lower base 1 and an upper crossbeam 4 parallel to and above the lower base 1. The lower base 1 and the upper crossbeam 4 are fixedly connected by a plurality of guiding columns 2. A moving crossbeam 3 that is slidably engaged with the guiding columns 2 up and down is installed between the upper crossbeams 4 above the lower base 1. A loading cylinder 11 for driving the moving crossbeam 3 to slide is installed on the lower base 1. A load cell 10 and a lower hydraulic fixture 9 are installed on the upper surface of the lower base 1. The load cell 10 is installed between the upper surface of the lower base 1 and the lower hydraulic fixture 9.

[0022] The hydraulic fixture adjustment device of the present utility model is used to finely adjust the upper hydraulic fixture 8 up and down. The hydraulic fixture adjustment device includes a reduction motor 7, a sprocket 6, a nut sleeve 13, and a lead screw 5. The reduction motor 7 and the sprocket 6 are installed on the upper surface of the moving crossbeam 3. The reduction motor 7 is in transmission connection with the sprocket 6. The sprocket 6 is provided with a central hole. The nut sleeve 13 is rotatably arranged in the moving crossbeam 3 and coaxially fixed to the lower end surface of the sprocket 6. The lead screw 5 is in threaded connection with the nut sleeve 13. The upper hydraulic fixture 8 is fixedly installed at the bottom of the lead screw 5.

[0023] In an alternative embodiment, as Figure 2 shown, the nut sleeve 13 is a T-shaped sleeve. The moving crossbeam 3 is provided with a through hole for installing the nut sleeve 13. Two annular steps are provided in the through hole. The upper annular step 31 is used to support the T-shaped sleeve. A limiting ring 17 is fixed to the outer edge of the nut sleeve 13 at the bottom of the moving crossbeam 3. The upper end surface of the limiting ring 17 is in contact with the lower surface of the moving crossbeam 3. Through the above structure, the nut sleeve 13 is rotatable and non-movable up and down in the moving crossbeam 3.

[0024] In addition, bearings 16 are provided between the upper annular step 31 and the T-shaped sleeve, and between the limit ring 17 and the lower annular step 32, making the rotation of the nut sleeve 13 in the moving crossbeam 3 smoother, reducing friction, and improving the sensitivity and accuracy of the adjustment device. At the same time, the setting of the bearings 16 also enhances the stability of the nut sleeve 13, ensuring that there will be no wobbling or falling off during high-speed rotation.

[0025] In an alternative embodiment, the reduction motor 7 is drivingly connected to the sprocket 6 through a conveyor belt 12. In other embodiments, a chain or direct gear meshing can also be used to achieve the driving connection between the reduction motor 7 and the sprocket 6.

[0026] In an alternative embodiment, the lead screw 5 is provided with upper and lower limit convex rings, and the nut sleeve 13 is located between the upper and lower limit convex rings, and the upper and lower movement ranges of the lead screw 5 are restricted by the two limit convex rings. For example, when the lead screw 5 moves upward to a certain position, the limit convex ring at its bottom catches on the lower end face of the nut sleeve 13 to prevent it from continuing to rotate and move upward, realizing the limitation of the maximum upward stroke.

[0027] The utility model uses a reduction motor 7 to drive the sprocket 6 and the nut sleeve. The rotation of the nut sleeve 13 drives the lead screw 5 to move up and down, so as to adjust the position of the upper hydraulic fixture 8 at the lower end of the lead screw 5, thus safely and accurately adjusting the position of the hydraulic fixture. Subsequently, the specimen is fixed on the upper and lower hydraulic fixtures, the loading cylinder 11 is started, and the loading cylinder 11 drives the upper and lower hydraulic fixtures to move towards each other to conduct a tensile test on the specimen. The load sensor 10 detects the tensile force value, and the experimental data is recorded for each test. Different from traditional testing machines that can only use the loading cylinder to lift and lower the moving crossbeam to drive the hydraulic fixture to adjust the position. With the device of the present application, it is safer and more accurate to fix the specimen during the test, the test space is large, and it can better meet the social needs.

[0028] The advantages of the utility model are as follows:

[0029] 1. Simple structure and easy to implement: Through the combined use of a reduction motor, a sprocket, a nut sleeve, and a lead screw, the up and down fine adjustment of the upper hydraulic fixture is realized, and the overall structure is compact, which is convenient for installation and use in a tensile testing machine.

[0030] 2. High precision and good stability: The threaded connection between the nut sleeve and the lead screw ensures the accuracy of position adjustment. At the same time, the addition of bearings makes the rotation of the nut sleeve smoother, reduces friction, and improves the stability and accuracy of the adjustment device.

[0031] 3. Large adjustment range and strong adaptability: By setting the upper and lower limit convex rings, the up and down movement range of the lead screw is restricted. At the same time, the position of the limit convex rings can be adjusted according to the actual test requirements, so as to realize the fixation and adjustment of specimens with different lengths.

[0032] 4. High safety and simple operation: Compared with the traditional method of using a loading oil cylinder to lift and move the crossbeam to drive a hydraulic fixture for position adjustment, the device of the present utility model can adjust the position of the hydraulic fixture more safely and accurately, and has simple operation, improving the efficiency and safety of the test.

[0033] In summary, the present utility model provides a hydraulic fixture adjustment device in a tensile testing machine. By driving a sprocket and a nut sleeve with a reduction motor, the rotation of the nut sleeve drives the lead screw to move up and down, thereby realizing the position adjustment of the upper hydraulic fixture. The device has a simple structure, high precision, good stability, large adjustment range, high safety, simple operation, and strong versatility, can meet different test requirements, and improve the efficiency and safety of the test.

[0034] The preferred embodiments of the present utility model have been described above. It should be understood that the present utility model is not limited to the above specific embodiments, and the equipment and structures not described in detail should be understood to be implemented in a common manner in the art; any person skilled in the art, without departing from the scope of the technical solution of the present utility model, can make many possible changes and modifications to the technical solution of the present utility model by using the methods and technical contents disclosed above, or modify it into an equivalent embodiment with equivalent changes, which does not affect the essence of the present utility model. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present utility model without departing from the content of the technical solution of the present utility model still fall within the scope of the protection of the technical solution of the present utility model.

Claims

1. A hydraulic fixture adjustment device in a tensile testing machine. The tensile testing machine is provided with a lower base and an upper top beam (4) parallel to and above the lower base (1). The lower base (1) and the upper top beam (4) are fixedly connected by a plurality of guiding columns (2). A moving crossbeam (3) that is slidably matched with the guiding columns (2) up and down is installed between the upper top beams (4) above the lower base (1). A loading oil cylinder (11) for driving the moving crossbeam (3) to slide is installed on the lower base (1). A load sensor (10) and a lower hydraulic fixture (9) are installed on the upper surface of the lower base (1). The load sensor (10) is installed between the upper surface of the lower base (1) and the lower hydraulic fixture (9). It is characterized in that, The hydraulic fixture adjustment device is used for finely adjusting the upper hydraulic fixture (8) up and down. The hydraulic fixture adjustment device includes a reduction motor (7), a sprocket (6), a nut sleeve (13) and a lead screw (5). The reduction motor (7) and the sprocket (6) are installed on the upper surface of the moving crossbeam (3). The reduction motor (7) is in transmission connection with the sprocket (6). The sprocket (6) is provided with a central hole. The nut sleeve (13) is rotatably arranged in the moving crossbeam (3) and coaxially fixed to the lower end surface of the sprocket (6). The lead screw (5) is in threaded connection with the nut sleeve (13). The upper hydraulic fixture (8) is fixedly installed at the bottom of the lead screw (5).

2. The hydraulic fixture adjustment device in a tensile testing machine according to claim 1, characterized in that, The nut sleeve (13) is a T-shaped sleeve. The moving crossbeam (3) is provided with a through hole for installing the nut sleeve (13). There are two upper and lower annular steps in the through hole. The upper annular step (31) is used to support the T-shaped sleeve. A limiting ring (17) is fixed to the outer edge of the nut sleeve (13) at the bottom of the moving crossbeam (3). The upper end surface of the limiting ring (17) is in contact with the lower surface of the moving crossbeam (3).

3. The hydraulic fixture adjustment device in a tensile testing machine according to claim 1, characterized in that Bearings (16) are provided between the upper annular step (31) and the T-shaped sleeve, and between the limiting ring (17) and the lower annular step (32).

4. The hydraulic fixture adjustment device in a tensile testing machine according to claim 2, wherein A circle of threaded holes is provided on the upper end surface of the T-shaped sleeve; The sprocket (6) is provided with a circle of through holes around the central hole. The sprocket (6) is fixed to the upper end surface of the T-shaped sleeve by screws (15).

5. The hydraulic fixture adjustment device in a tensile testing machine as described in claim 1, characterized in that The reduction motor (7) is in transmission connection with the sprocket (6) through a conveyor belt (12).

6. The hydraulic fixture adjustment device in a tensile testing machine according to claim 1, characterized in that, Two upper and lower limiting convex rings are provided on the lead screw (5). The nut sleeve (13) is located between the two upper and lower limiting convex rings, and the up and down movement range of the lead screw (5) is restricted by the two limiting convex rings.

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