A press head for a bending apparatus

Abstract

The utility model relates to metal material detection art field, aims at solving the problem of existing technology in the adjustment bending device bottom support roll locking when support roll is easy to deviate, bottom support roll spacing precision is insufficient, pressure head model is single and cannot satisfy the demand of different bending test, provides a kind of bending device's pressure head, including connecting rod;Connecting rod bottom is connected with connecting sleeve, and connecting sleeve bottom is connected with force bar, and force bar bottom is connected with pressure head, and the outer surface of pressure head is equipped with the different thickness of ferrule;Connecting sleeve one end has rotating handle, and rotating handle transmission is connected with the first anti-deviation baffle and second anti-deviation baffle of mutual movement, and the same end of first anti-deviation baffle and second anti-deviation baffle is located in connecting sleeve and along the axial sliding fit of connecting sleeve.The beneficial effect of the utility model is that the position of support roll can be accurately controlled to prevent deviation and ensure accurate test data, different size specifications of ferrule are set to meet the needs of pressure head for different experiments, and the convenience of operation and detection accuracy are realized.

Description

Technical Field

[0001] This utility model relates to the field of metal material testing technology, and more specifically, to a pressure head for a bending device. Background Technology

[0002] Bending test is one of the basic test methods for detecting the mechanical properties of materials. It is mainly used to determine the mechanical properties of materials when subjected to bending load. Specifically, it involves using a special bending test machine or installing a bending test device on a universal testing machine, and then placing the sample to be tested on the bending test device to perform the bending test. Therefore, the performance of the bending test device is related to the ease of operation and accuracy of the bending test.

[0003] The indenter of the bending device is an indispensable part of the bending test. In the existing technology, many bending devices are fixed and locked with bolts. However, in daily tests, after adjusting the support roller of the indenter to the required position, the support roller often deviates from the original set position when it is locked with bolts. In addition, many bending devices only have one indenter for one specification. Therefore, some testing laboratories often need to prepare multiple sets of bending indenters to meet the needs of different bending tests, which causes great inconvenience to the storage of laboratory items. Utility Model Content

[0004] The present invention aims to provide a pressure head for a bending device to solve the problems in the prior art, such as easy displacement of the bottom support rollers when adjusting and locking the bottom support rollers, insufficient accuracy of the bottom support roller spacing, limited pressure head models, and inability to meet the needs of different bending tests.

[0005] The embodiments of this utility model are implemented as follows: This utility model embodiment provides a pressure head for a bending device, which includes a connecting rod; The bottom of the connecting rod is connected to a connecting sleeve, and a detachable force-applying rod is connected to the side of the connecting sleeve away from the connecting rod. The end of the force-applying rod away from the connecting sleeve is connected to a horizontally arranged pressure head, and the outer surface of the pressure head is fitted with collars of different thicknesses. One end of the connecting sleeve is provided with a rotatable rotary handle, and the rotary handle is connected to a first anti-deviation baffle and a second anti-deviation baffle that move relative to each other. The same end of the first anti-deviation baffle and the second anti-deviation baffle is located inside the connecting sleeve and slides along the axial direction of the connecting sleeve.

[0006] In use, first, select the appropriate thickness of the collar according to the bending test specifications of the sample to be tested and fit it on the outer surface of the indenter, ensuring that the collar fits tightly against the indenter. Then, connect and fix the connecting rod to the crossbeam of the testing machine, and rotate the rotary handle. Through its transmission action, drive the first anti-deviation baffle and the second anti-deviation baffle to slide synchronously towards or away from each other along the axial direction of the connecting sleeve until the two anti-deviation baffles are adjusted to the required roller spacing position for the test. Next, fit the inner sides of the two rollers at the bottom of the bending device tightly against the first anti-deviation baffle and the second anti-deviation baffle, respectively, and lock the rollers with bolts to prevent roller deviation. Then check the connection status of the force rod and the connecting sleeve. If the force rod is not perpendicular to the sample, the connection angle of the force rod can be disassembled and readjusted to ensure that the force rod remains perpendicular to the sample. Finally, start the testing machine. The crossbeam of the testing machine drives the connecting rod, the connecting sleeve, the force rod, and the indenter to move synchronously. The indenter applies a bending load to the sample through the collar, completing the bending test.

[0007] The bending device disclosed in this embodiment has a pressure head equipped with a first anti-deviation baffle and a second anti-deviation baffle that can be driven by the aforementioned rotary handle and slidably engaged along the axial direction of the aforementioned connecting sleeve. When the support roller is locked after adjustment, the two anti-deviation baffles can form a stable limit on the support roller, effectively preventing the support roller from deviating and ensuring the accuracy of the distance adjustment between the support rollers. At the same time, the outer surface of the pressure head can be fitted with collars of different thicknesses, eliminating the need to prepare multiple sets of the pressure head to adapt to bending tests of different specifications, solving the problem of inconvenient laboratory storage. In addition, the force rod and the aforementioned connecting sleeve are detachably connected, which facilitates the adjustment of the angle of the force rod or the replacement of components according to the test requirements, further improving the ease of operation. Thus, the pressure head of the bending device has the beneficial effects of accurately controlling the position of the support roller to prevent deviation and ensuring the accuracy of test data, meeting the needs of different tests by setting collars of different sizes and specifications, and achieving convenient operation and accurate testing.

[0008] Optionally: the connecting rod is welded to one side of the connecting sleeve, and the force-applying rod is threaded to the other side of the connecting sleeve.

[0009] This configuration, by welding the connecting rod and the connecting sleeve together, forms a stable, integrated connection structure. This effectively avoids the problem of pressure head position displacement caused by loosening of the connection during the test loading process, ensuring that the loading force is stably transmitted along the preset path and providing structural support for the accuracy of the test data. In addition, the force-applying rod and the connecting sleeve are connected by threads, which not only achieves reliable assembly but also allows for flexible disassembly and assembly of the force-applying rod to adapt to different test scenarios. Furthermore, by finely adjusting the thread fit angle, it can be ensured that the force-applying rod remains perpendicular to the sample, reducing the interference of force direction deviation on the test results and helping to improve the efficiency and accuracy of the bending test.

[0010] Optionally, the connecting rod, the connecting sleeve, and the force-applying rod are all located on the same axis.

[0011] This configuration ensures that the applied force can be stably transmitted along the same axis during the bending test. At the same time, the coaxial design makes the overall structure of the device more regular, which facilitates the precise positioning of each component during assembly, reduces installation errors, and also improves the stability of the device during operation.

[0012] Optionally: The connecting sleeve has an L-shaped cavity inside, the L-shaped cavity is arranged along the axial direction of the connecting sleeve, and the same end of the first anti-deviation baffle and the second anti-deviation baffle is movable and limited in the L-shaped cavity. The L-shaped cavity is also provided with a threaded rod with opposite threads at both ends along its axial direction. The same end of the first anti-deviation baffle and the second anti-deviation baffle are respectively threaded to the two ends of the threaded rod, and one end of the threaded rod is fixed to the rotating handle.

[0013] With this configuration, the L-shaped cavity is arranged axially along the connecting sleeve and forms a movable limit on the same end of the first and second anti-deviation baffles. This provides precise guidance for the movement of the anti-deviation baffles, preventing them from shifting or becoming unstable during adjustment, and ensuring that the anti-deviation baffles always move along a preset trajectory to accurately align with the support rollers. Furthermore, the threaded rod arranged axially has opposite threads at both ends and is threadedly connected to the corresponding ends of the first and second anti-deviation baffles. Rotating the handle connected to one end of the threaded rod drives the first anti-deviation baffle. The baffle and the second anti-deviation baffle move synchronously towards or away from each other along the threaded rod, enabling rapid and symmetrical adjustment of the distance between the two support rollers carrying the tested item, significantly improving adjustment efficiency and accuracy. At the same time, the cooperation between the L-shaped cavity and the threaded rod ensures the stability of the adjustment of the first and second anti-deviation baffles, and maintains the fixed position of the first and second anti-deviation baffles after adjustment through the self-locking property of the threaded drive, preventing the support rollers from shifting due to external force during the test, and further ensuring the accuracy and reliability of the bending test.

[0014] Optionally: Both sides of the connecting sleeve corresponding to the L-shaped cavity are closed structures, and one end of the threaded rod rotatably passes through the connecting sleeve near the end of the rotating handle and is welded to the rotating handle.

[0015] This design prevents radial offset or wobbling of the threaded rod during rotation and adjustment, ensuring its transmission stability. It also prevents external impurities from entering the cavity and affecting the movement of the anti-deviation baffle and the transmission of the threaded rod, thus extending the service life of the components.

[0016] Optionally, both the first anti-deviation baffle and the second anti-deviation baffle are provided with folding clips for folding in the middle.

[0017] With this configuration, the aforementioned folding clips can fold the first and second anti-deviation baffles to the left and right sides to prevent them from affecting the test.

[0018] Optionally: the connecting sleeve has a threaded hole on the side away from the connecting rod, the force-applying rod has an external thread at the end near the connecting sleeve, and the force-applying rod is threaded into the threaded hole.

[0019] This setup allows for flexible disassembly and replacement of the aforementioned force-applying rods of different specifications according to test requirements, adapting to various bending test scenarios. In addition, if the aforementioned force-applying rod is not perpendicular to the sample after assembly, the angle can be finely adjusted by rotating the aforementioned force-applying rod to ensure that it transmits the loading force along the preset axis, avoiding the impact of force direction deviation on the accuracy of test data.

[0020] Optionally, the two ends of the pressure head are respectively bolted with a first cover plate and a second cover plate, the diameter of the first cover plate and the second cover plate is larger than that of the pressure head, and the collar is limited on the outer surface of the pressure head between the first cover plate and the second cover plate.

[0021] With this configuration, the first and second cover plates, being larger than the pressure head, can reliably limit the collar fitted on the outer surface of the pressure head, effectively preventing the collar from falling off or flying out due to force during the test, thus improving the safety of the test operation. In addition, the bolt connection method facilitates flexible disassembly and assembly of the first and second cover plates, and makes it easy to replace collars of different specifications, ensuring the loading accuracy of the bending test and the accuracy of the test results.

[0022] Optionally: The above-mentioned collar has a C-shaped structure.

[0023] With this design, the C-shaped collar is easy to install and remove. Simply align the collar opening with the pressure head to quickly put on or take off the collar, greatly simplifying the installation and removal process and improving the convenience of replacing collars of different specifications. At the same time, it makes the collar less likely to fall off.

[0024] Optionally, the lower ends of both the first anti-deviation baffle and the second anti-deviation baffle are arc-shaped.

[0025] This configuration avoids localized wear caused by sharp edges when the rollers come into contact with the support rollers carrying the tested items, reduces contact wear between the bottom support rollers and the first and second anti-deviation baffles, and extends their service life.

[0026] In summary, the bending device disclosed in this utility model has the advantages of accurately controlling the position of the support roller to prevent deviation and ensure accurate test data, meeting the needs of different experiments by setting collars of different sizes and specifications, and achieving the benefits of convenient operation and accurate detection. Attached Figure Description

[0027] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a front view of the pressure head of a bending device in an embodiment of this utility model; Figure 2 This is a side sectional view of the pressure head of a bending device in an embodiment of this utility model; Figure 3 This is a schematic diagram of the collar structure in an embodiment of this utility model.

[0029] Icons: 1-Connecting rod, 2-Connecting sleeve, 3-Force bar, 4-Pressure head, 5-Loop, 6-Rotating handle, 7-First anti-deviation baffle, 8-Second anti-deviation baffle, 9-L-shaped cavity, 10-Threaded rod, 11-Folding clip, 12-Threaded hole, 13-External thread, 14-First cover plate, 15-Second cover plate, 16-Guide limit strip. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0031] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0032] Example See Figure 1 , Figure 2 and Figure 3This embodiment proposes a pressure head for a bending device, including a connecting rod 1; A connecting sleeve 2 is connected to the bottom of the connecting rod 1. A detachable force-applying rod 3 is connected to the side of the connecting sleeve 2 away from the connecting rod 1. A horizontally arranged pressure head 4 is connected to the end of the force-applying rod 3 away from the connecting sleeve 2. A collar 5 of different thicknesses is fitted on the outer surface of the pressure head 4. One end of the connecting sleeve 2 is provided with a rotatable rotating handle 6. The rotating handle 6 is connected to a first anti-deviation baffle 7 and a second anti-deviation baffle 8 that move relative to each other. The same end of the first anti-deviation baffle 7 and the second anti-deviation baffle 8 is located inside the connecting sleeve 2 and slides along the axial direction of the connecting sleeve 2.

[0033] In use, first select a collar 5 of the corresponding thickness according to the bending test specifications of the sample to be tested and fit it on the outer surface of the pressure head 4, ensuring that the collar 5 fits tightly with the pressure head 4; then connect and fix the connecting rod 1 to the crossbeam of the testing machine (not shown in the figure), rotate the rotating handle 6, and drive the first anti-deviation baffle 7 and the second anti-deviation baffle 8 to slide synchronously towards or away from each other along the axial direction of the connecting sleeve 2 through its transmission action, until the two anti-deviation baffles are adjusted to the required roller spacing position for the test; then place the two rollers at the bottom of the bending device (not shown in the figure) The inner side is tightly fitted with the first anti-deviation baffle 7 and the second anti-deviation baffle 8 respectively, and the support roller is locked with bolts to prevent the support roller from shifting; then check the connection status between the force rod 3 and the connecting sleeve 2. If the force rod 3 is not perpendicular to the sample, the connection angle of the force rod 3 can be disassembled and readjusted to ensure that the force rod 3 is perpendicular to the sample; finally, start the testing machine. The crossbeam of the testing machine drives the connecting rod 1, the connecting sleeve 2, the force rod 3 and the pressure head 4 to move synchronously. The pressure head 4 applies a bending load to the sample through the collar 5 to complete the bending test.

[0034] The pressure head of the bending device disclosed in this embodiment is equipped with a first anti-deviation baffle 7 and a second anti-deviation baffle 8, which can be driven by a rotating handle 6 and slidably engaged along the connecting sleeve 2. When the support roller is locked after adjustment, the two anti-deviation baffles can form a stable limit on the support roller, effectively preventing the support roller from deviating and ensuring the accuracy of the distance adjustment between the support rollers. At the same time, the outer surface of the pressure head 4 can be fitted with collars 5 of different thicknesses, so that multiple sets of pressure heads 4 can be prepared to adapt to bending tests of different specifications, solving the problem of inconvenient laboratory storage. In addition, the force rod 3 and the connecting sleeve 2 are detachably connected, which makes it easy to adjust the angle of the force rod 3 or replace parts according to the test requirements, further improving the convenience of operation. Thus, the pressure head of the bending device can accurately control the position of the support roller to prevent deviation and ensure the accuracy of test data, meet the needs of different tests by setting collars 5 of different sizes and specifications, and achieve the beneficial effects of convenient operation and accurate detection.

[0035] See Figure 1 , Figure 2 and Figure 3The connecting rod 1 is welded to one side of the connecting sleeve 2, and the force-applying rod 3 is threaded to the other side of the connecting sleeve 2. By welding and fixing the connecting rod 1 and the connecting sleeve 2, a stable integrated connection structure can be formed, which can effectively avoid the problem of displacement of the pressure head 4 caused by the loose connection between the two during the test loading process, and ensure that the loading force is stably transmitted along the preset path, providing structural support for the accuracy of the test data. In addition, the force-applying rod 3 and the connecting sleeve 2 are connected by threads, which can achieve reliable assembly and flexibly disassemble the force-applying rod 3 to adapt to different test scenarios. It can also ensure that the force-applying rod 3 is perpendicular to the sample by finely adjusting the thread fit angle, reducing the interference of the test results due to the deviation of the force direction, and helping to improve the efficiency and accuracy of the bending test.

[0036] The connecting rod 1, connecting sleeve 2, and force-applying rod 3 are all located on the same axis. This ensures that the applied force can be stably transmitted along the same axis during the bending test. The force is transferred from the connecting rod 1, which receives the force from the crossbeam of the testing machine, to the connecting sleeve 2, and then to the force-applying rod 3. The force-applying rod 3 then acts on the pressure head 4 and is finally applied to the specimen. This avoids additional lateral forces or uneven force due to axis offset throughout the process, effectively reducing the interference of specimen force deviation on the test data and ensuring the accuracy of the bending test results. At the same time, the coaxial design makes the overall structure of the device more regular, which facilitates precise positioning of each component during assembly, reduces installation errors, and also improves the stability of the device during operation. This avoids vibration or structural damage caused by component eccentricity and extends the service life of the device.

[0037] See Figure 1 , Figure 2 and Figure 3The connecting sleeve 2 has an L-shaped cavity 9 inside, which is arranged along the axial direction of the connecting sleeve 2. The same end of the first anti-deviation baffle 7 and the second anti-deviation baffle 8 is movable and limited within the L-shaped cavity 9. A threaded rod 10 with opposite threads at both ends is also provided along the axial direction of the L-shaped cavity 9. The same end of the first anti-deviation baffle 7 and the second anti-deviation baffle 8 are respectively threaded to the two ends of the threaded rod 10. One end of the threaded rod 10 is fixed to the rotating handle 6. The L-shaped cavity 9, arranged along the axial direction of the connecting sleeve 2, provides a movable limit for the same end of the first anti-deviation baffle 7 and the second anti-deviation baffle 8, providing precise guidance for the movement of the anti-deviation baffles and preventing them from shifting or becoming unstable during adjustment. This ensures that the anti-deviation baffles always move along a preset trajectory to accurately align with the support rollers. Furthermore… The threaded rod 10, which is axially arranged, has opposite threads at both ends and is threadedly connected to the corresponding ends of the first anti-deviation baffle 7 and the second anti-deviation baffle 8. When the rotating handle 6 connected to one end of the threaded rod 10 is rotated, the first anti-deviation baffle 7 and the second anti-deviation baffle 8 can be driven to move synchronously towards or away from each other along the threaded rod 10, so as to realize the rapid and symmetrical adjustment of the distance between the two support rollers carrying the tested item, which greatly improves the adjustment efficiency and accuracy. At the same time, the cooperation between the L-shaped cavity 9 and the threaded rod 10 not only ensures the stability of the adjustment of the first anti-deviation baffle 7 and the second anti-deviation baffle 8, but also maintains the fixed position of the first anti-deviation baffle 7 and the second anti-deviation baffle 8 after adjustment through the self-locking property of the threaded transmission, so as to avoid the support rollers from shifting due to external force during the test, and further ensure the accuracy and reliability of the bending test.

[0038] The connecting sleeve 2 corresponding to the L-shaped cavity 9 has a closed structure on both sides. One end of the threaded rod 10 can rotatably pass through the connecting sleeve 2 and is welded to the rotating handle 6. This prevents the threaded rod 10 from radially shifting or shaking during rotation adjustment, ensuring its transmission stability. At the same time, it can prevent external impurities from entering the cavity and affecting the movement of the anti-deviation baffle and the transmission of the threaded rod 10, thus extending the service life of the components.

[0039] See Figure 1 , Figure 2 and Figure 3 The first anti-deviation baffle 7 and the second anti-deviation baffle 8 are both provided with folding clips 11 in the middle. The folding clips 11 can fold the first anti-deviation baffle 7 and the second anti-deviation baffle 8 to the left and right sides to prevent the first anti-deviation baffle 7 and the second anti-deviation baffle 8 from affecting the test.

[0040] The connecting sleeve 2 has a threaded hole 12 on the side away from the connecting rod 1, and the end of the force-applying rod 3 near the connecting sleeve 2 has an external thread 13. The force-applying rod 3 is threaded into the threaded hole 12. This makes it easy to flexibly disassemble and replace different specifications of force-applying rods 3 according to test requirements, adapting to various bending test scenarios. In addition, if the force-applying rod 3 is not perpendicular to the sample after assembly, the angle can be finely adjusted by rotating the force-applying rod 3 to ensure that it transmits the loading force along the preset axis, avoiding the influence of the test data accuracy due to the deviation of the force direction.

[0041] See Figure 1 , Figure 2 and Figure 3 The first cover plate 14 and the second cover plate 15 are bolted to both ends of the pressure head 4. The diameter of the first cover plate 14 and the second cover plate 15 is larger than that of the pressure head 4. The collar 5 is limited on the outer surface of the pressure head 4 between the first cover plate 14 and the second cover plate 15. The first cover plate 14 and the second cover plate 15 are larger than the pressure head 4, which can reliably limit the collar 5 fitted on the outer surface of the pressure head 4, effectively preventing the collar 5 from falling off or flying out due to force during the test, and improving the safety of the test operation. In addition, the bolted connection method facilitates the flexible disassembly and assembly of the first cover plate 14 and the second cover plate 15, and facilitates the replacement of collars 5 of different specifications, ensuring the loading accuracy of the bending test and the accuracy of the test results.

[0042] The collar 5 has a C-shaped structure, which makes it easy to install and remove. Simply align the opening of the collar 5 with the pressure head 4 to quickly put it on or take it off, greatly simplifying the installation and removal process of the collar 5 and improving the convenience of replacing collars 5 of different specifications. At the same time, it makes the collar 5 less likely to fall off.

[0043] See Figure 1 , Figure 2 and Figure 3 The lower ends of the first anti-deviation baffle 7 and the second anti-deviation baffle 8 are both arc-shaped. This can avoid the local wear caused by sharp edges when they come into contact with the support roller that carries the tested item, reduce the contact loss between the support roller used for bottom support and the first anti-deviation baffle 7 and the second anti-deviation baffle 8, and extend the service life of both.

[0044] Both the first cover plate 14 and the second cover plate 15 are circular, which can prevent personnel from being injured by collisions with the sharp edges of the first cover plate 14 and the second cover plate 15 during the test operation, and improve the safety of the device.

[0045] See Figure 1 , Figure 2 and Figure 3In this embodiment, the upper part of the connecting rod 1 is connected to the upper crossbeam of the testing machine (not shown in the figure). The upper crossbeam of the testing machine applies downward pressure to the connecting rod 1. The fixed end of the item to be tested corresponding to the pressure head 4 has two support rollers. The two support rollers can slide coaxially with each other. The item to be tested is fixed between the two support rollers. By making the two support rollers closely adhere to the first anti-deviation baffle 7 and the second anti-deviation baffle 8, it is ensured that the axis of the distance between the two support rollers is coaxial with the axis of the connecting rod 1, the force rod 3 and the pressure head 4.

[0046] See Figure 1 , Figure 2 and Figure 3 In this embodiment, the connecting rod 1 is located at the top of the entire pressure head 4 and is connected to the upper crossbeam of the testing machine. It moves with the upper crossbeam of the testing machine to load the bending specimen. Below the connecting rod 1 is the connecting sleeve 2. The connecting rod 1 is located at the axis of the connecting sleeve 2. The connecting sleeve 2 is a cuboid with an L-shaped cavity 9 inside the front side. A threaded rod 10 is located inside the L-shaped cavity 9. The upper parts of the first anti-deviation baffle 7 and the second anti-deviation baffle 8 pass through the threaded rod 10. One end of the threaded rod 10 is connected to a rotating handle 6. Rotating the rotating handle 6 allows the first anti-deviation baffle 7 and the second anti-deviation baffle 8 to move on the threaded rod 10. The first anti-deviation baffle 7 and the second anti-deviation baffle 8 are in the shape of a bent arm. Through cooperation with the connecting sleeve 2 and the threaded rod 10, they effectively prevent the first anti-deviation baffle 7 and the second anti-deviation baffle 8 from moving on the threaded rod 10. The second anti-deviation baffle 8 becomes unstable within the connecting sleeve 2; there is a folding clip 11 at the upper part of the first anti-deviation baffle 7 and the second anti-deviation baffle 8, which can fold the first anti-deviation baffle 7 and the second anti-deviation baffle 8 to the left and right sides to prevent the first anti-deviation baffle 7 and the second anti-deviation baffle 8 from affecting the test; there is a threaded hole 12 at the lower center of the connecting sleeve 2, and the force rod 3 is connected to it through the end thread; the lower end of the force rod 3 is connected to the pressure head 46, and the pressure head 4 has a first cover plate 14 and a second cover plate 15 at the front and back respectively, and the first cover plate 14 and the second cover plate 15 are connected to the two ends of the pressure head 4 by bolts; during the test, open either the first cover plate 14 or the second cover plate 15, put the collar 5 of the required diameter into the pressure head 4, and then lock the first cover plate 14 or the second cover plate 15 by bolts.

[0047] See Figure 1 , Figure 2 and Figure 3 In this embodiment, by setting the first anti-deviation baffle 7 and the second anti-deviation baffle 8, the two rollers of the bending device can be effectively prevented from shifting when locked with bolts, thereby making the distance adjustment between the rollers more precise; and the setting of the collar 5 meets the requirements of different size and specification pressure heads 4; at the same time, the test process is controlled by the pressure head 4 testing machine, so as to realize the convenience of test operation and the accuracy of detection.

[0048] In this embodiment, the inner wall of the collar 5 has symmetrically distributed guide limiting strips 16, and the outer wall of the pressure head 4 has a groove (not shown in the figure) adapted to the guide limiting strips 16. When the collar 5 slides into the pressure head 4 from one end and wraps around the pressure head 4, the guide limiting strips 16 are embedded in the groove and slide along the axial direction of the groove, effectively preventing the collar 5 from rotating on the pressure head 4, making the connection between the collar 5 and the pressure head 4 more stable.

[0049] See Figure 1 , Figure 2 and Figure 3 The specific operating method of this utility model is as follows: Step 1: Install the pressure head 4 onto the crossbeam of the testing machine via the connecting rod 1 to complete the fixed connection between the device and the testing machine; Step 2: Open the folding clips 11 on the first anti-deviation baffle 7 and the second anti-deviation baffle 8, rotate the rotating handle 6, and drive the first anti-deviation baffle 7 and the second anti-deviation baffle 8 to slide along the connecting sleeve 2 axially until they move to the required support roller spacing position for the test. Step 3: Fit the inner sides of the two rollers of the bending device tightly with the first anti-deviation baffle 7 and the second anti-deviation baffle 8 respectively, and lock the two rollers with bolts. Then fold the folding clip 11 to ninety degrees to avoid the anti-deviation baffle from interfering with the test. Step 4: Select a collar 5 with a thickness matching the test specifications, loosen the bolts of the first cover plate 14 or the second cover plate 15 at both ends of the pressure head 4, remove the cover plate on either side, put the collar 5 on the outer surface of the pressure head 4, then put the cover plate back on and tighten the bolts to complete the fixing of the collar 5. Step 5: Screw the end of the force-applying rod 3 with the external thread 13 into the threaded hole 12 on the side of the connecting sleeve 2 away from the connecting rod 1. If the force-applying rod 3 is not perpendicular to the sample after the thread is locked, rotate the thread in the loosening direction and fine-tune it until the force-applying rod 3 is perpendicular to the sample. Step 6: Start the testing machine. The crossbeam on the testing machine drives the connecting rod 1, connecting sleeve 2, force application rod 3 and pressure head 4 to move synchronously. The pressure head 4 applies bending load to the sample through the collar 5 to carry out the bending test.

[0050] The above description is merely a preferred embodiment of this utility model and is not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A pressure head for a bending device, characterized in that: Includes connecting rod (1); The bottom of the connecting rod (1) is connected to a connecting sleeve (2), and a detachable force-applying rod (3) is connected to the side of the connecting sleeve (2) away from the connecting rod (1). A horizontally arranged pressure head (4) is connected to the end of the force-applying rod (3) away from the connecting sleeve (2). The outer surface of the pressure head (4) is fitted with collars (5) of different thicknesses. One end of the connecting sleeve (2) is provided with a rotatable rotating handle (6). The rotating handle (6) is connected to a first anti-deviation baffle (7) and a second anti-deviation baffle (8) that move relative to each other. The same end of the first anti-deviation baffle (7) and the second anti-deviation baffle (8) is located inside the connecting sleeve (2) and slides along the axial direction of the connecting sleeve (2).

2. The pressure head of the bending device according to claim 1, characterized in that: The connecting rod (1) is welded to one side of the connecting sleeve (2), and the force-applying rod (3) is threaded to the other side of the connecting sleeve (2).

3. The pressure head of the bending device according to claim 1, characterized in that: The connecting rod (1), the connecting sleeve (2), and the force-applying rod (3) are all located on the same axis.

4. The pressure head of the bending device according to claim 1, characterized in that: The connecting sleeve (2) has an L-shaped cavity (9) inside. The L-shaped cavity (9) is arranged along the axial direction of the connecting sleeve (2). The same end of the first anti-deviation baffle (7) and the second anti-deviation baffle (8) is movable and limited in the L-shaped cavity (9). The L-shaped cavity (9) is also provided with a threaded rod (10) with opposite threads at both ends in the axial direction. The same end of the first anti-deviation baffle (7) and the second anti-deviation baffle (8) are respectively threaded to the two ends of the threaded rod (10). One end of the threaded rod (10) is fixed to the rotating handle (6).

5. The pressure head of the bending device according to claim 4, characterized in that: The L-shaped cavity (9) has a closed structure on both sides of the connecting sleeve (2). One end of the threaded rod (10) can rotatably pass through the connecting sleeve (2) near the end of the rotating handle (6) and is welded to the rotating handle (6).

6. The pressure head of the bending device according to claim 1, characterized in that: Both the first anti-deviation baffle (7) and the second anti-deviation baffle (8) are provided with folding clips (11) for folding in the middle.

7. The pressure head of the bending device according to claim 1, characterized in that: The connecting sleeve (2) has a threaded hole (12) on the side away from the connecting rod (1), and the force-applying rod (3) has an external thread (13) at the end near the connecting sleeve (2), and the force-applying rod (3) is threaded into the threaded hole (12).

8. The pressure head of the bending device according to claim 1, characterized in that: The two ends of the pressure head (4) are bolted to a first cover plate (14) and a second cover plate (15), respectively. The diameters of the first cover plate (14) and the second cover plate (15) are larger than that of the pressure head (4). The collar (5) is positioned on the outer surface of the pressure head (4) between the first cover plate (14) and the second cover plate (15).

9. The pressure head of the bending device according to claim 1, characterized in that: The collar (5) has a C-shaped structure.

10. The pressure head of a bending device according to claim 1, characterized in that: The lower ends of the first anti-deviation baffle (7) and the second anti-deviation baffle (8) are both arc-shaped.

Images