Loading system of microcomputer-controlled electro-hydraulic servo static load anchoring testing machine

Abstract

The utility model provides a loading system of a microcomputer-controlled electro-hydraulic servo static load anchoring testing machine, which comprises a jack body provided with a piston anti-rotation device, a piston front and back limiting device and a piston displacement indicating device. The piston anti-rotation device comprises an anti-rotation sleeve and an anti-rotation rod, wherein the anti-rotation sleeve is installed on the outer circle of a cylinder body of the jack body, the anti-rotation rod is connected with the anti-rotation sleeve in a sliding mode and connected with the end face of a piston of the jack body through a connecting plate, and the tail end of the anti-rotation rod is connected with a travel switch contact piece. The device has the following beneficial effects that the piston anti-rotation devices on the two sides are additionally arranged, so that the rotation problem of a steel strand sample in the loading process can be solved; front and back piston limiting devices are arranged, so that unforeseen circumstances caused by over travel of the piston can be avoided, and the safety protection level of equipment is improved; a piston displacement indicating device is arranged, so that a tester can pre-stretch out the piston by a certain amount, and sample loading and pre-loading of a porous sample and sample unloading operation after a test are facilitated.

Description

Technical Field

[0001] The utility model relates to the technical field of mechanical testing, in particular to a loading system of a microcomputer-controlled electro-hydraulic servo static load anchoring testing machine. Background Art

[0002] With the significant increase in the number of produced anchoring testing machines, users in various industries have more specific and diversified requirements for the equipment structure form and accessory devices. Based on the emphasis on market opinions, it is decided to comprehensively upgrade the loading system and related accessories of the anchoring testing machine, with a view to further exploring market potential and becoming a more competitive product; the current host structure is that a load sensor is connected to a through-hole jack, which requires high installation accuracy for both, and this puts forward high requirements for the maintenance of the equipment. Moreover, the existing jack structure does not have a piston anti-rotation device, front and rear limit devices, and a piston displacement indication device, and there is an urgent need to optimize aspects such as the accuracy of the indication value, the convenience of the test, and the equipment safety protection level. Summary of the Utility Model

[0003] In view of the above-mentioned disadvantages of the prior art, the purpose of the present utility model is to provide a loading system of a microcomputer-controlled electro-hydraulic servo static load anchoring testing machine, which is used to solve the problem that the existing jack structure does not have a piston anti-rotation device, front and rear limit devices, and a piston displacement indication device.

[0004] To achieve the above purpose and other related purposes, the present utility model provides the following technical solutions:

[0005] A loading system of a microcomputer-controlled electro-hydraulic servo static load anchoring testing machine includes a jack body, and a piston anti-rotation device, a piston front and rear limit device, and a piston displacement indication device are provided on the jack body; the piston anti-rotation device includes an anti-rotation sleeve installed on the outer circle of the cylinder body of the jack body and an anti-rotation rod slidably connected to the anti-rotation sleeve and connected to the piston end face of the jack body through a connecting plate. The end of the anti-rotation rod away from the connecting plate passes through the anti-rotation sleeve and is connected with a travel switch contact piece. The piston front and rear limit device includes a mounting cover installed on the anti-rotation sleeve, and a first travel switch and a second travel switch are provided on the mounting cover corresponding to the travel switch contact piece. The piston displacement indication device includes a scale component installed on the anti-rotation sleeve and a pointer component installed on the connecting plate.

[0006] In an embodiment of the present utility model, the number of the piston anti-rotation devices is two, and the two piston anti-rotation devices are symmetrically arranged on both sides of the piston of the jack body. The piston front and rear limit device is arranged on one of the piston anti-rotation devices, and the piston displacement indication device is arranged on the other piston anti-rotation device.

[0007] In an embodiment of the present utility model, one side of the connecting plate is installed on the piston end face of the jack body, and the other side of the connecting plate is connected to the anti-rotation rod.

[0008] In an embodiment of the present utility model, the first travel switch is used to perform forward limit on the anti-rotation rod and is installed on the surface of the installation cover on the side close to the connecting plate, and the second travel switch is used to perform rear limit on the anti-rotation rod and is installed on the surface of the installation cover on the side far from the connecting plate. In this technical solution, the movement of the piston on the jack body can drive the anti-rotation rod to slide in the anti-rotation sleeve, thereby driving the travel switch contact piece to move. When the travel switch contact piece contacts the first travel switch and the second travel switch, over-travel protection can be triggered, thereby performing front and rear limits on the piston and avoiding accidents caused by piston over-travel.

[0009] In an embodiment of the present utility model, the piston front and rear limit device further includes a wire-pulling encoder installed on the installation cover and a stretching head fixing block installed on the connecting plate. The wire-pulling encoder is electrically connected to the computer through a network signal, and the wire-pulling stretching head on the wire-pulling encoder is installed on the stretching head fixing block. In this technical solution, the movement of the piston on the jack body can drive the connecting plate to move, thereby enabling the wire-pulling encoder to take in and release the wire rope, and thus the moving distance of the piston on the jack body can be obtained according to the number of rotation turns of the wire-pulling encoder.

[0010] In an embodiment of the present utility model, the scale assembly includes a scale fixing plate installed on the anti-rotation sleeve and a scale installed on the scale fixing plate, and the pointer assembly includes a pointer fixing plate installed on the connecting plate and a pointer installed on the pointer fixing plate. The tip of the pointer faces the scale line on the scale. In this technical solution, the movement of the piston on the jack body can drive the connecting plate to move, thereby driving the pointer to move. According to the moving distance of the pointer on the scale, the moving range of the piston of the jack body can be judged.

[0011] As described above, a loading system of a microcomputer-controlled electro-hydraulic servo static load anchorage testing machine of the present utility model has the following

[0012] Beneficial effects:

[0013] (1) The original jack has no piston anti-rotation device, and the piston may rotate during the loading of the steel strand specimen. This phenomenon will cause the measured value of the relative displacement of the steel strand to be inaccurate, resulting in errors in the total elongation data. The newly added piston anti-rotation device of the present utility model can solve the rotation problem of the steel strand specimen during loading, improve the measurement accuracy of the relative displacement data of the steel strand, and thus the indication accuracy of the total elongation can be correspondingly improved.

[0014] (2) The original jack does not have a piston front and rear limit device. In case of misoperation during the test, the jack is prone to damage; the newly added piston front and rear limit device of the present utility model can prevent accidents caused by piston overtravel.

[0015] (3) The original jack does not have a piston displacement indication device. During the preloading process of the specimen, the test personnel have no quantitative concept of the pre-extension amount of the piston and it is not easy to control; after the newly added piston displacement indication device of the present utility model, it is recommended that the test personnel pre- extend the piston by 20 mm before the test, leaving a 20 mm backward space to ensure that the sample can be unloaded conveniently by the backward movement of the piston after the test is completed. At the same time, it is also convenient to unload the sample in case of abnormality during sample loading. Description of the Drawings

[0016] Figure 1 It shows a front view schematic diagram of the piston anti-rotation device in the loading system of the microcomputer-controlled electro-hydraulic servo static load anchorage testing machine disclosed in the embodiment of the present utility model;

[0017] Figure 2 It shows a left view schematic diagram of the piston anti-rotation device in the loading system of the microcomputer-controlled electro-hydraulic servo static load anchorage testing machine disclosed in the embodiment of the present utility model;

[0018] Figure 3 It shows a schematic diagram of the piston front and rear limit device in the loading system of the microcomputer-controlled electro-hydraulic servo static load anchorage testing machine disclosed in the embodiment of the present utility model;

[0019] Figure 4 It shows a schematic diagram of the piston displacement indication device in the loading system of the microcomputer-controlled electro-hydraulic servo static load anchorage testing machine disclosed in the embodiment of the present utility model.

[0020] Description of Component Labels

[0021] 1. Piston of the jack body; 2. Outer circle of the cylinder body of the jack body; 3. Connecting plate; 4. Anti-rotation sleeve; 5. Anti-rotation rod; 6. Travel switch contact piece; 7. Installation cover; 8. First travel switch; 9. Second travel switch; 10. Wire drawing encoder; 11. Tensile head fixing block; 12. Wire drawing tensile head; 13. Scale fixing plate; 14. Scale; 15. Pointer fixing plate; 16. Pointer. Detailed Embodiments

[0022] The following specific embodiments illustrate the implementation manners of the present utility model. Those skilled in the art can easily understand other advantages and effects of the present utility model from the content disclosed in this specification. It should be noted that, without conflict, the following embodiments and the features in the embodiments can be combined with each other.

[0023] Please refer to Figure 1 andFigure 2 , the present utility model provides a loading system for a microcomputer-controlled electro-hydraulic servo static load anchorage testing machine, which includes a jack body. A piston anti-rotation device, a piston front and rear limit device, and a piston displacement indication device are provided on the jack body. The piston anti-rotation device includes an anti-rotation sleeve 4 installed on the outer circle 2 of the cylinder body of the jack body and an anti-rotation rod 5 that is slidably connected to the anti-rotation sleeve 4 and connected to the end face of the piston 1 of the jack body through a connecting plate 3. One side of the connecting plate 3 is installed on the end face of the piston 1 of the jack body through two screws, and the other side of the connecting plate 3 is connected to the anti-rotation rod 5 through one screw. The end of the anti-rotation rod 5 away from the connecting plate 3 passes through the anti-rotation sleeve 4 and is connected with a travel switch contact piece 6 through a screw. Among them, the number of piston anti-rotation devices is two, and the two piston anti-rotation devices are symmetrically arranged on both sides of the piston 1 of the jack body. The piston front and rear limit device is arranged on one of the piston anti-rotation devices, and the piston displacement indication device is arranged on the other piston anti-rotation device. In addition, the anti-rotation rod 5 can smoothly move back and forth in the anti-rotation sleeve 4 along with the forward and backward movement of the piston 1 of the jack body, so as to prevent the piston 1 of the jack body from rotating.

[0024] In Figure 3 , the piston front and rear limit device includes a mounting cover 7 installed on the anti-rotation sleeve 4 through four screws. A first travel switch 8 and a second travel switch 9 are provided on the mounting cover 7 corresponding to the travel switch contact piece 6. Among them, the distance between the first travel switch 8 and the second travel switch 9 is installed on the mounting cover 7 according to the travel length of the anti-rotation rod 5. The first travel switch 8 is used for front limiting the anti-rotation rod 5 and is installed on the surface of the mounting cover 7 close to the connecting plate 3, and the second travel switch 9 is used for rear limiting the anti-rotation rod 5 and is installed on the surface of the mounting cover 7 away from the connecting plate 3. The movement of the piston 1 on the jack body can drive the anti-rotation rod 5 to slide in the anti-rotation sleeve 4, so as to drive the travel switch contact piece 6 to move. When the travel switch contact piece 6 contacts the first travel switch 8 and the second travel switch 9, it can trigger over-travel protection, so as to limit the piston 1 front and rear and avoid accidents caused by the over-travel of the piston 1;

[0025] The piston front and rear limit device also includes a wire-drawing encoder 10 installed on the mounting cover 7 through two screws and a tension head fixing block 11 installed on the connecting plate 3 through two screws. The wire-drawing encoder 10 is electrically connected to the computer through a network signal. The wire-drawing tension head 12 on the wire-drawing encoder 10 is installed on the tension head fixing block 11. Among them, the wire-drawing tension head 12 is fixed on the tension head fixing block 11 with a pin and clamped with an elastic retaining ring, so that the pin cannot slip off. The movement of the piston on the jack body can drive the connecting plate 3 to move, so as to enable the wire-drawing encoder 10 to take in and release the pull rope, and thus the moving distance of the piston 1 on the jack body can be obtained according to the number of rotation turns of the wire-drawing encoder 10.

[0026] In Figure 4 it, the piston displacement indicating device includes a scale component mounted on the anti-rotation sleeve 4 and a pointer component mounted on the connecting plate 3. The scale component includes a scale fixing plate 13 mounted on the anti-rotation sleeve 4 by two screws and a scale 14 mounted on the scale fixing plate 13 by four screws. The pointer component includes a pointer fixing plate 15 mounted on the connecting plate 3 by two screws and a pointer 16 mounted on the pointer fixing plate 15 by two screws. The tip of the pointer 16 faces the scale lines on the scale 14. Among them, the scale lines on the scale 14 are used to display the piston range. The movement of the piston on the jack body can drive the connecting plate 3 to move, thereby driving the pointer 16 to move. According to the moving distance of the pointer 16 on the scale 14, the moving range of the piston 1 of the jack body can be judged.

[0027] The beneficial effects of the present utility model are as follows: (1) The original jack does not have a piston anti-rotation device, and the piston may rotate during the loading of the steel strand specimen. This phenomenon will cause the measured value of the relative displacement of the steel strand to be inaccurate, resulting in errors in the total elongation data. The newly added piston anti-rotation device of the present utility model can solve the rotation problem of the steel strand specimen during loading, improve the measurement accuracy of the relative displacement data of the steel strand, and thus improve the indication accuracy of the total elongation; (2) The original jack does not have a piston front and rear limit device. In case of misoperation during the test, the jack is likely to be damaged. The newly added piston front and rear limit device of the present utility model can prevent accidents caused by the overtravel of the piston 1; (3) The original jack does not have a piston displacement indicating device. During the preloading process of the specimen, the test personnel have no quantitative concept of the pre-extension amount of the piston 1 and it is not easy to control. After the newly added piston displacement indicating device of the present utility model, it is recommended that the test personnel pre-extension the piston 1 by 20 mm before the test, and reserve 20 mm of retraction space to ensure that the sample can be unloaded by the retraction of the piston 1 after the test is completed. At the same time, it is also convenient to unload the sample in case of abnormalities during sample loading.

[0028] The above embodiments are only illustrative of the principles and effects of the present utility model, and are not used to limit the present utility model. All equivalent modifications or changes made by those with ordinary knowledge in the technical field without departing from the spirit and technical ideas disclosed by the present utility model should still be covered by the claims of the present utility model.

Claims

1. A loading system for a microcomputer-controlled electro-hydraulic servo static load anchorage testing machine, including a jack body, characterized in that: The jack body is provided with a piston anti-rotation device, a piston front and rear limit device, and a piston displacement indication device; The piston anti-rotation device includes an anti-rotation sleeve (4) installed on the outer circle (2) of the cylinder body of the jack body and an anti-rotation rod (5) that is slidably connected to the anti-rotation sleeve (4) and connected to the end face of the piston (1) of the jack body through a connecting plate (3). The end of the anti-rotation rod (5) far from the connecting plate (3) passes through the anti-rotation sleeve (4) and is connected with a travel switch contact piece (6). The piston front and rear limit device includes a mounting cover (7) installed on the anti-rotation sleeve (4). A first travel switch (8) and a second travel switch (9) corresponding to the travel switch contact piece (6) are provided on the mounting cover (7). The piston displacement indication device includes a scale assembly installed on the anti-rotation sleeve (4) and a pointer assembly installed on the connecting plate (3).

2. The loading system of a microcomputer-controlled electro-hydraulic servo static load anchorage testing machine according to claim 1, characterized in that: The number of the piston anti-rotation devices is two, and the two piston anti-rotation devices are symmetrically arranged on both sides of the piston (1) of the jack body. The piston front and rear limit device is arranged on one of the piston anti-rotation devices, and the piston displacement indication device is arranged on the other piston anti-rotation device.

3. The loading system of a microcomputer-controlled electro-hydraulic servo static load anchorage testing machine according to claim 1, characterized in that: One side of the connecting plate (3) is installed on the end face of the piston (1) of the jack body, and the other side of the connecting plate (3) is connected with the anti-rotation rod (5).

4. The loading system of a microcomputer-controlled electro-hydraulic servo static load anchorage testing machine according to claim 3, characterized in that: The first travel switch (8) is used for front limiting the anti-rotation rod (5) and is installed on the surface of the mounting cover (7) on the side close to the connecting plate (3). The second travel switch (9) is used for rear limiting the anti-rotation rod (5) and is installed on the surface of the mounting cover (7) on the side far from the connecting plate (3).

5. The loading system of a microcomputer-controlled electro-hydraulic servo static load anchorage testing machine according to claim 3, characterized in that: The piston front and rear limit device further includes a wire-pulling encoder (10) installed on the mounting cover (7) and a stretching head fixing block (11) installed on the connecting plate (3). The wire-pulling encoder (10) is electrically connected to a computer through a network signal. The wire-pulling stretching head (12) on the wire-pulling encoder (10) is installed on the stretching head fixing block (11).

6. The loading system of a microcomputer-controlled electro-hydraulic servo static load anchorage testing machine according to claim 3, characterized in that: The scale assembly includes a scale fixing plate (13) installed on the anti-rotation sleeve (4) and a scale (14) installed on the scale fixing plate (13). The pointer assembly includes a pointer fixing plate (15) installed on the connecting plate (3) and a pointer (16) installed on the pointer fixing plate (15). The tip of the pointer (16) faces the scale line on the scale (14).

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