A screw rod reverse gap adjusting mechanism of a hydraulic universal testing machine

Abstract

This utility model belongs to the field of hydraulic universal testing machines, specifically relating to a screw backlash adjustment mechanism for a hydraulic universal testing machine. It includes a lower crossbeam, with main nuts fixedly connected to both sides of the lower crossbeam. A screw is threadedly connected to the internal threads of the main nuts, and the bottom of the screw is fixedly connected to the hydraulic universal testing machine body. An adjusting nut is threadedly connected to the surface of the screw, and a spring is fixedly connected to the top of the adjusting nut. This utility model, by adding an adjusting nut and other structures to the screw, allows for rotation to change its position on the screw. Combined with the elastic force of the spring, it continuously applies pressure to the main nut, thereby eliminating the backlash between the screw and the main nut, improving the testing accuracy of the testing machine. Simultaneously, the locking mechanism fixes the position of the adjusting nut, preventing it from loosening due to vibration or other factors during machine operation, ensuring the stability of the adjusted backlash, and extending the service life of the mechanism.

Description

Technical Field

[0001] This utility model relates to the technical field of hydraulic universal testing machines, specifically to a screw backlash adjustment mechanism for a hydraulic universal testing machine. Background Technology

[0002] According to the patent authorization announcement number CN206592506U, a screw backlash adjustment structure for a hydraulic universal testing machine is disclosed. This utility model relates to the technical field of hydraulic universal testing machines. Its key technical features are: a screw and a lower crossbeam; a main nut that mates with the screw; and an adjusting nut that mates with the screw on the screw below the main nut. The upper end face of the adjusting nut has several grooves along its circumference, and springs are installed in the grooves to accommodate the tightening nut sleeve. At the lower end of the main nut and on the adjusting nut, a first set screw hole communicating with the lead screw hole is provided on the outer wall of the lower crossbeam. A first set screw for fixing the main nut is provided in the first set screw hole. A second set screw hole is provided on the upper part of the pre-tightening nut. A second set screw hole is provided in the second set screw hole for fixing the main nut. A third set screw hole is provided on the lower part of the pre-tightening nut. A third set screw hole is provided in the third set screw hole for fixing the adjusting nut. This utility model eliminates the reverse clearance between the lead screw and the main nut, ensures the smooth movement of the lower crossbeam during the experiment, and greatly improves the accuracy of the experimental results.

[0003] However, there is a problem with the existing technology: the adjusting nut is located on the surface of the lead screw, and the lead screw can easily drive the adjusting nut to rotate during rotation, which causes the gap between the adjusting nut and the main nut to change, causing the adjusting nut to move automatically and reducing the gap maintenance effect between the adjusting nut and the main nut. Utility Model Content

[0004] The purpose of this utility model is to provide a screw backlash adjustment mechanism for a hydraulic universal testing machine. This mechanism solves the problem that the adjusting nut is located on the surface of the screw, and the screw easily drives the adjusting nut to rotate during rotation, causing changes in the distance between the adjusting nut and the main nut. This results in the adjusting nut moving automatically, reducing the effectiveness of maintaining the distance between the adjusting nut and the main nut.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a screw backlash adjustment mechanism for a hydraulic universal testing machine, comprising a lower crossbeam, with main nuts fixedly connected to both sides of the lower crossbeam, a screw threadedly connected to the inside of the main nuts, a hydraulic universal testing machine body fixedly connected to the bottom of the screw, an adjusting nut threadedly connected to the surface of the screw, a spring fixedly connected to the top of the adjusting nut, the top of the spring contacting the bottom of the main nuts, a rotating sleeve fixedly connected to the surface of the adjusting nut, a locking disc fixedly connected to the top of the rotating sleeve, and a locking mechanism provided inside the locking disc.

[0006] Preferably, the locking mechanism includes a pin located on the right side inside the locking disc, the top of the pin extending through the interior of the lower crossbeam, a round block fixedly connected to the top of the pin, a tension spring fixedly connected to the bottom of the round block, and the bottom of the tension spring fixedly connected to the bottom of the inner wall of the lower crossbeam.

[0007] Preferably, a push block is fixedly connected to the outer side of the circular block, and the outer side of the push block extends to the outer side of the lower crossbeam.

[0008] Preferably, a shielding cloth is fixedly connected to the top of the push block, and the top of the push block is fixedly connected to the top of the inner wall of the lower crossbeam.

[0009] Preferably, a reinforcing ring is fixedly connected to the bottom of the locking disc, and the inner wall of the reinforcing ring is fixedly connected to the surface of the rotating sleeve.

[0010] Preferably, a stabilizing sleeve is fitted onto the surface of the pin, and the top of the stabilizing sleeve is fixedly connected to the bottom of the lower crossbeam.

[0011] Preferably, the surface of the rotating sleeve is fixedly connected with a number of raised strips, which are distributed in a equidistant ring.

[0012] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0013] 1. This utility model can effectively adjust the reverse clearance between the lead screw and the main nut by adding a main nut, an adjusting nut, a spring and a locking mechanism to the lead screw.

[0014] 2. This utility model, by adding a clearance adjusting nut and other structures to the lead screw, can change its position on the lead screw by rotation. Combined with the elastic force of the spring, it can continuously apply pressure to the main nut, thereby eliminating the gap between the lead screw and the main nut, improving the testing accuracy of the testing machine. At the same time, the locking mechanism can fix the position of the clearance adjusting nut, preventing the clearance adjusting nut from loosening due to vibration and other factors during the operation of the testing machine, ensuring the stability after clearance adjustment, and extending the service life of the mechanism. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model;

[0016] Figure 2 This is a three-dimensional cross-sectional view of the main nut of this utility model;

[0017] Figure 3 For the present utility model Figure 2 Enlarged structural diagram at point A in the middle.

[0018] In the diagram: 1. Lower crossbeam; 2. Main nut; 3. Lead screw; 4. Hydraulic universal testing machine body; 5. Adjusting nut; 6. Spring; 7. Rotating sleeve; 8. Locking disc; 91. Pin; 92. Round block; 93. Spring; 10. Push block; 11. Covering cloth; 12. Reinforcing ring; 13. Stabilizing sleeve; 14. Raised bar. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] Please see Figure 1-3 A backlash adjustment mechanism for a lead screw 3 of a hydraulic universal testing machine includes a lower crossbeam 1, with main nuts 2 fixedly connected to both sides of the lower crossbeam 1. A lead screw 3 is threadedly connected to the inside of the main nuts 2. The bottom of the lead screw 3 is fixedly connected to the hydraulic universal testing machine body 4. An adjustment nut 5 is threadedly connected to the surface of the lead screw 3. A spring 6 is fixedly connected to the top of the adjustment nut 5. The top of the spring 6 contacts the bottom of the main nuts 2. A rotating sleeve 7 is fixedly connected to the surface of the adjustment nut 5. A locking disc 8 is fixedly connected to the top of the surface of the rotating sleeve 7. A locking mechanism is provided inside the locking disc 8.

[0021] Please see Figure 1-3 The locking mechanism includes a pin 91, which is located on the right side inside the locking disc 8. The top of the pin 91 extends through the interior of the lower crossbeam 1. A round block 92 is fixedly connected to the top of the pin 91, and a tension spring 93 is fixedly connected to the bottom of the round block 92. The bottom of the tension spring 93 is fixedly connected to the bottom of the inner wall of the lower crossbeam 1.

[0022] Furthermore, the locking and unlocking of the locking disc 8 can be achieved quickly through the setting of the pin 91, the round block 92 and the tension spring 93. When it is necessary to adjust the gap adjustment nut 5, simply overcome the elastic force of the spring 6 to pull the pin 91 to disengage it from the locking disc 8. After the adjustment is completed, the pin 91 automatically inserts into the locking disc 8 under the action of the spring 6 to complete the locking. This structure is easy to operate and reliable in locking, which can effectively improve the efficiency of gap adjustment and ensure that the gap adjustment nut 5 will not be displaced during operation, further ensuring the testing accuracy of the testing machine.

[0023] Please see Figure 1-3 A push block 10 is fixedly connected to the outer side of the round block 92, and the outer side of the push block 10 extends through to the outer side of the lower crossbeam 1.

[0024] Furthermore, by setting the push block 10, the round block 92 and the pin 91 can be moved by pushing the push block 10 without the need for additional tools, making the unlocking and locking operations of the locking mechanism more labor-saving and convenient, reducing the number of operation steps, and improving the convenience of gap adjustment. Especially when the gap is frequently adjusted, it can significantly improve work efficiency.

[0025] Please see Figure 1-3 A shielding cloth 11 is fixedly connected to the top of the push block 10, and the top of the push block 10 is fixedly connected to the top of the inner wall of the lower crossbeam 1.

[0026] Furthermore, by setting up the shielding cloth 11, dust, impurities, and other contaminants can be blocked from entering the mechanism, preventing these contaminants from affecting the normal operation of components such as the pin 91 and spring 6, reducing the failure rate of the mechanism, extending the maintenance cycle and service life of the locking mechanism, and ensuring the reliability of the locking function.

[0027] Please see Figure 1-3 A reinforcing ring 12 is fixedly connected to the bottom of the locking disc 8, and the inner wall of the reinforcing ring 12 is fixedly connected to the surface of the rotating sleeve 7.

[0028] Furthermore, by setting the reinforcing ring 12, these forces can be dispersed, preventing loosening or deformation between the locking disc 8 and the rotating sleeve 7, improving the stability and load-bearing capacity of the entire locking structure, and ensuring the long-term stable operation of the locking mechanism.

[0029] Please see Figure 1-3 A stabilizing sleeve 13 is fitted onto the surface of the pin 91, and the top of the stabilizing sleeve 13 is fixedly connected to the bottom of the lower crossbeam 1.

[0030] Furthermore, by setting the stabilizing sleeve 13, its lateral displacement can be restricted, ensuring that the pin 91 always moves in a straight line, so that the pin 91 can be accurately and smoothly inserted into or disengaged from the locking disc 8, avoiding the situation where the locking fails or operation is difficult due to the pin 91 being misaligned, thus improving the working reliability of the locking mechanism.

[0031] Please see Figure 1-3 The surface of the rotating sleeve 7 is fixedly connected with a protrusion 14. There are several protrusions 14, and the several protrusions 14 are distributed around it at equal intervals.

[0032] Furthermore, by setting the convex strip 14, the friction on the surface of the rotating sleeve 7 is increased. When the operator rotates the rotating sleeve 7 to adjust the gap adjusting nut 5, the convex strip 14 can effectively prevent the hand from slipping, making the rotation operation more labor-saving and stable, and facilitating precise control of the rotation angle of the gap adjusting nut 5. This allows for more accurate adjustment of the gap between the lead screw 3 and the main nut 2, further improving the testing accuracy of the testing machine.

[0033] The specific implementation process of this utility model is as follows: In use, the angle between the rotating sleeve 7 and the adjusting nut 5 is fixed by the cooperation of the pin 91 and the locking disc 8, so that the adjusting nut 5 cannot loosen on the surface of the lead screw 3, and the distance between the main nut 2 and the adjusting nut 5 can always be maintained.

[0034] When it is necessary to adjust the gap between the adjusting nut 5 and the main nut 2, push the push block 10 upward. The push block 10 drives the round block 92 to move upward. The round block 92 stretches the tension spring 93. The round block 92 drives the pin 91 to move upward. The pin 91 exits from the inside of the locking disc 8. The locking disc 8 and the rotating sleeve 7 can then be rotated. The rotating sleeve 7 drives the adjusting nut 5 to rotate, and the gap between the adjusting nut 5 and the main nut 2 can be adjusted.

[0035] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A screw reverse gap adjustment mechanism of a hydraulic universal testing machine, comprising a lower cross beam (1), characterized in that: Both sides of the lower crossbeam (1) are fixedly connected with main nuts (2). The internal threads of the main nuts (2) are connected with lead screws (3). The bottom of the lead screws (3) is fixedly connected with the body of the hydraulic universal testing machine (4). The surface of the lead screws (3) is threadedly connected with adjusting nuts (5). The top of the adjusting nuts (5) is fixedly connected with springs (6). The top of the springs (6) is in contact with the bottom of the main nuts (2). The surface of the adjusting nuts (5) is fixedly connected with rotating sleeves (7). The top of the surface of the rotating sleeves (7) is fixedly connected with locking discs (8). The locking discs (8) are equipped with locking mechanisms.

2. The screw reverse gap adjusting mechanism of a hydraulic universal testing machine according to claim 1, characterized in that: The locking mechanism includes a pin (91) located on the right side inside the locking disc (8). The top of the pin (91) extends through the interior of the lower crossbeam (1). A round block (92) is fixedly connected to the top of the pin (91). A tension spring (93) is fixedly connected to the bottom of the round block (92). The bottom of the tension spring (93) is fixedly connected to the bottom of the inner wall of the lower crossbeam (1).

3. The reverse gap adjusting mechanism of the hydraulic universal testing machine screw rod according to claim 2, characterized in that: A push block (10) is fixedly connected to the outside of the circular block (92), and the outside of the push block (10) extends through to the outside of the lower crossbeam (1).

4. The reverse gap adjusting mechanism of the hydraulic universal testing machine screw rod according to claim 3, characterized in that: The top of the push block (10) is fixedly connected to a shielding cloth (11), and the top of the push block (10) is fixedly connected to the top of the inner wall of the lower crossbeam (1).

5. The reverse gap adjustment mechanism of a hydraulic universal testing machine according to claim 1, wherein: The bottom of the locking disc (8) is fixedly connected to a reinforcing ring (12), and the inner wall of the reinforcing ring (12) is fixedly connected to the surface of the rotating sleeve (7).

6. The reverse gap adjusting mechanism of the hydraulic universal testing machine screw rod according to claim 2, characterized in that: The surface of the pin (91) is fitted with a stabilizing sleeve (13), and the top of the stabilizing sleeve (13) is fixedly connected to the bottom of the lower crossbeam (1).

7. The reverse gap adjusting mechanism of the screw rod of the hydraulic universal testing machine according to claim 1, characterized in that: The rotating sleeve (7) has a fixed connection of a protrusion (14) to its surface. The number of protrusions (14) is several, and the several protrusions (14) are distributed in a equidistant ring.

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