Universal testing machine clamp suitable for open type high-temperature furnace
By designing a universal testing machine fixture suitable for open high-temperature furnaces, and using a combination of a square right-angled U-shaped frame and a connecting rod, compression loading was achieved, solving the problem of instability of slender rods in existing technologies and meeting the needs of high-temperature material performance testing.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-25
- Publication Date
- 2026-04-03
AI Technical Summary
Existing material performance testing fixtures in open high-temperature furnaces cannot achieve compression loading, and slender rods are prone to instability under compression loads, resulting in large experimental errors and failing to meet the requirements for material performance testing in high-temperature environments.
A universal testing machine fixture suitable for open high-temperature furnaces was designed. It adopts a square right-angled U-shaped frame combined with a connecting rod, and achieves compression loading through threaded connection and concentric shaft sliding hole cooperation. The fixture design avoids the instability problem of slender rods.
It achieves compression loading within a high-temperature furnace, avoiding instability of slender rods, reducing experimental errors, and is suitable for small-volume high-temperature furnaces, meeting the needs of high-temperature material performance testing.
Smart Images
Figure CN224081330U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of clamping device technology, specifically relating to a universal testing machine clamp suitable for open high-temperature furnaces. Background Technology
[0002] With increasing demands for material performance in industry and scientific research, particularly in aerospace, automotive manufacturing, and energy development, the need for testing the mechanical properties of materials under high-temperature environments is growing. This requires universal testing machines and their fixtures to be able to adapt to high-temperature testing environments and accurately assess the tensile and compressive properties of materials at high temperatures. Because the clamping units of universal testing machines are relatively large and cannot be placed in high-temperature furnaces, a common approach is to create large-volume environmental chambers. However, this solution is costly and it is difficult to reach temperatures exceeding 1000°C. Another approach is an open-type high-temperature furnace, which has a smaller furnace size and significantly reduces the cost of high-temperature loading solutions.
[0003] Existing material property testing fixtures for open high-temperature furnaces cannot provide common clamp-type fixtures due to the small volume of the furnace. For tensile tests, the solution is to use a slender rod extending into the furnace, with the specimen machined to have a threaded connection at the clamping end. This allows for tensile loading, but not compressive loading. Specifically, the slender rod is prone to instability under compressive loads. During the experiment, misalignment may occur due to installation issues, leading to significant specimen sway, experimental errors, or even failure. Therefore, a compression loading fixture that can be placed inside the small open high-temperature furnace is needed, while simultaneously eliminating the instability caused by compressive loads on the slender rod. Utility Model Content
[0004] To address the aforementioned problems, this utility model proposes a universal testing machine fixture suitable for open high-temperature furnaces.
[0005] The universal testing machine fixture for open high-temperature furnaces of this utility model includes: a connecting rod, which is connected to the universal testing machine; a square right-angled U-shaped frame, which is connected to the connecting rod, and one end of the square right-angled U-shaped frame has a groove and the other end has a through hole; and a fixture, which is installed between two oppositely arranged square right-angled U-shaped frames through the through hole and the groove.
[0006] There are two connecting rods, with one end of each rod facing the other and the other end connected to the universal testing machine.
[0007] Each end of the connecting rod has an inwardly extending threaded groove.
[0008] The square right-angled U-shaped frame includes a U-shaped part, a protruding end, and a smooth end. The protruding end and the smooth end are located at the two ends of the U-shaped part, respectively, and the protruding end is perpendicular to the smooth end.
[0009] The outer surface of the protruding end connected to the connecting rod is engraved with an external thread that matches the threaded groove, and the end of the protruding end away from the connecting rod is recessed inward to form a smooth groove.
[0010] The smooth end has a through hole at its end, and the central axis of the through hole coincides with the central axis of the smooth groove.
[0011] The square right-angled U-shaped frame is divided into an upper square right-angled U-shaped frame and a lower square right-angled U-shaped frame. The smooth end of the lower square right-angled U-shaped frame has a through hole on its side. The through hole passes through the through hole, and the central axis of the through hole is perpendicular to the central axis of the through hole. A pin is installed at the through hole.
[0012] The clamp is a compression clamp, which includes an upper compression clamp and a lower compression clamp. Both the upper and lower compression clamps include a disc and a round rod located at the center of the disc and perpendicular to the disc. The round rod passes through a through hole and a smooth groove and is connected to a square right-angled U-shaped frame. The round rod of the upper compression clamp has a through hole at one end near the disc, which cooperates with the through hole and pin in the square right-angled U-shaped frame.
[0013] The fixture is a shearing fixture, which includes an upper shearing fixture and a lower shearing fixture. The upper shearing fixture includes a shearing tool and a round rod, and the lower shearing fixture includes a fixing block and a round rod. The fixing block has a through hole perpendicular to the axis of the round rod. A fastening bolt is installed on the side of the fixing block through hole away from the round rod. The round rod passes through the through hole and a smooth groove and is connected to a square right-angled U-shaped frame. The round rod of the upper shearing fixture has a second through hole that matches the through hole and pin in the square right-angled U-shaped frame.
[0014] The clamp is a bending clamp, which includes an upper bending clamp and a lower bending clamp. The upper bending clamp includes a round rod and an upper pressure head, and the lower bending clamp includes a round rod and two lower pressure heads with a gap between them. The round rod passes through a through hole and a smooth groove and connects to a square right-angled U-shaped frame. The round rod of the upper bending clamp has a through hole three that matches the through hole and pin in the square right-angled U-shaped frame.
[0015] The beneficial effects of this utility model are as follows: the utility model adopts a square right-angled U-shaped frame, which enables the tie rod to achieve compression loading under tensile load, avoiding the risk of instability under compression conditions of slender rods, and minimizing the space of the compression fixture; the utility model is small in size and can be easily applied to small-volume open high-temperature furnaces; the through holes and smooth grooves of the square right-angled U-shaped frame are matched with concentric sliding holes, which can achieve coaxial loading and effectively avoid the problem of eccentric loading caused by non-axial compression loading. Attached Figure Description
[0016] Figure 1 This is a perspective view of an embodiment of the compression clamp of this utility model.
[0017] Figure 2 This is a front view of an embodiment of the compression clamp of this utility model.
[0018] Figure 3 This is a structural schematic diagram of the compression clamp of this utility model.
[0019] Figure 4 This is a perspective view of an embodiment of the shearing fixture of this utility model.
[0020] Figure 5 This is a front view of an embodiment of the shearing fixture of this utility model.
[0021] Figure 6 This is a schematic diagram of the upper shearing fixture of this utility model.
[0022] Figure 7 This is a schematic diagram of the lower shearing fixture of this utility model.
[0023] Figure 8 This is the front view of the lower shearing fixture of this utility model.
[0024] Figure 9 This is a side view of the lower shearing fixture of this utility model.
[0025] Figure 10 This is a perspective view of an embodiment of the bending clamp of this utility model.
[0026] Figure 11 This is a front view of an embodiment of the bending fixture of this utility model.
[0027] Figure 12 This is a schematic diagram of the upper bending clamp of this utility model.
[0028] Figure 13 This is a schematic diagram of the structure of the bending fixture of this utility model.
[0029] Figure label:
[0030] 1. High-temperature furnace; 2. Connecting rod; 3. Square right-angled U-shaped frame; 4. Threaded groove; 5. Smooth groove; 6. Through hole; 7. Pin; 8. External thread; 9. Compression clamp; 9. Through hole one 901; 902. Shearing clamp; 10. Fastening bolt; 102. Through hole two 102; Shearing blade; 104. Fixing block; 105. Fixing block through hole; 11. Bending clamp; 111. Through hole three 111; Upper pressure head 112; Lower pressure head 113. Detailed Implementation
[0031] The embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.
[0032] like Figures 1-13 As shown, the universal testing machine fixture of this utility model, applicable to an open high-temperature furnace, includes: a connecting rod 2, a square right-angled U-shaped frame 3, and a fixture located in the high-temperature furnace 1. The connecting rod 2 is connected to the universal testing machine. There are two connecting rods 2, one end of which is arranged opposite to the other end of which is connected to the universal testing machine. The corresponding ends of the connecting rods 2 are provided with inwardly extending threaded grooves 4.
[0033] The square right-angled U-shaped frame 3 includes two that are arranged vertically and opposite each other, and the two square right-angled U-shaped frames 3 are connected to the two connecting rods 2 one by one. Each square right-angled U-shaped frame 3 has a groove at one end and a through hole 6 at the other end; the clamp is installed between the two square right-angled U-shaped frames 3 arranged opposite each other through the through hole 6 and the groove.
[0034] Specifically, each square right-angled U-shaped frame 3 includes a U-shaped portion, a protruding end, and a smooth end. The protruding end and the smooth end are located at opposite ends of the U-shaped portion, with the protruding end perpendicular to the smooth end. The openings of the U-shaped portions of both square right-angled U-shaped frames 3 face inwards.
[0035] The outer surface of the protruding end connected to the connecting rod 2 is engraved with an external thread 8 that matches the threaded groove 4, that is, the protruding end and the connecting rod 2 are threadedly connected. The end of the protruding end away from the connecting rod 2 is recessed inward to form a smooth groove 5. The smooth groove 5 and the connecting rod 2 are set on the same axis.
[0036] The smooth end has a through hole 6 at its end. The central axis of the through hole 6 coincides with the central axis of the smooth groove 5. That is, the through hole 6 and the smooth groove 5 are set with concentric axes. The fixture is connected to the square right-angled U-shaped frame 3 through the through hole 6 and the smooth groove 5.
[0037] Two rectangular right-angled U-shaped frames 3 are divided into an upper rectangular right-angled U-shaped frame and a lower rectangular right-angled U-shaped frame. A through hole is provided on the smooth end of the lower rectangular right-angled U-shaped frame, passing through a through hole 6. The central axis of the through hole is perpendicular to the central axis of the through hole 6. A pin 7 is installed at the through hole. When the fixture is connected to the rectangular right-angled U-shaped frame 3 through the through hole 6 and the smooth groove 5, the pin 7 passes through the through hole and the through hole 6 to fix the rectangular right-angled U-shaped frame 3 and the fixture together. After the test, the pin 7 is removed, thus separating the fixture and the rectangular right-angled U-shaped frame 3, which can then be used to replace the fixture.
[0038] Example 1
[0039] like Figures 1-3As shown, the clamp is a compression clamp 9, which includes an upper compression clamp and a lower compression clamp. Both the upper and lower compression clamps include a disk 902 and a round rod located at the center of the disk 902 and perpendicular to the disk 902. The round rod of the upper compression clamp has a through hole 901 at one end near the disk 902, which cooperates with the through hole and pin 7 in the lower square right-angled U-shaped frame.
[0040] During installation, the round rod of the lower compression clamp passes sequentially through the through hole 6 of the upper square right-angled U-shaped frame and the smooth groove 5 of the lower square right-angled U-shaped frame. The round rod of the upper compression clamp also passes sequentially through the through hole 6 of the lower square right-angled U-shaped frame and the smooth groove 5 of the upper square right-angled U-shaped frame. A pin 7 passes through the through hole and through hole 901 to connect the upper compression clamp and the lower square right-angled U-shaped frame. The sample is placed between the discs 902 of the upper and lower compression clamps. Ultimately, the upper compression clamp, the lower compression clamp, the through hole 6 and smooth groove 5 of the upper square right-angled U-shaped frame, and the through hole 6 and smooth groove 5 of the lower square right-angled U-shaped frame are all concentrically arranged.
[0041] Example 2
[0042] like Figures 4-9 As shown, the fixture is a shearing fixture 10, which includes an upper shearing fixture and a lower shearing fixture. The upper shearing fixture includes a shearing cutter 103 and a round rod connected to each other. The lower shearing fixture includes a fixing block 104 and a round rod connected to each other. A fixing block through hole 105 is provided in the fixing block 104 in a direction perpendicular to the axis of the round rod. A threaded hole is provided on the side of the fixing block through hole 105 away from the round rod. A fastening bolt 101 is installed in the threaded hole. A through hole 102 is provided on the round rod of the upper shearing fixture to cooperate with the through hole and pin 7 in the lower square right-angled U-shaped frame.
[0043] During installation, the round rod of the lower shearing fixture passes sequentially through the through hole 6 of the upper square right-angled U-shaped frame and the smooth groove 5 of the lower square right-angled U-shaped frame. The sample is then passed through the fixing block through hole 105 in the fixing block 104 and secured by the fastening bolt 101. The round rod of the upper shearing fixture passes sequentially through the through hole 6 of the lower square right-angled U-shaped frame and the smooth groove 5 of the upper square right-angled U-shaped frame. The upper shearing fixture and the lower square right-angled U-shaped frame are connected together by a pin 7 passing through the through hole and the second through hole 102. Finally, the round rods of the upper and lower shearing fixtures, the through hole 6 and smooth groove 5 of the upper and lower square right-angled U-shaped frames are all concentrically arranged.
[0044] Example 3
[0045] like Figures 1-13As shown, the fixture is a bending fixture 11, which includes an upper bending fixture and a lower bending fixture. The upper bending fixture includes a round rod and an upper pressure head 112, and the lower bending fixture includes a round rod and two lower pressure heads 113. There is a gap between the two lower pressure heads 113. Both the upper pressure head 112 and the lower pressure head 113 are cylindrical. The round rod of the upper bending fixture has a through hole 111 that matches the through hole and pin 7 in the lower square right-angled U-shaped frame.
[0046] During installation, the round rod of the lower bending fixture passes sequentially through the through hole 6 of the upper square right-angled U-shaped frame and the smooth groove 5 of the lower square right-angled U-shaped frame. The round rod of the upper bending fixture passes sequentially through the through hole 6 of the lower square right-angled U-shaped frame and the smooth groove 5 of the upper square right-angled U-shaped frame. A pin 7 passes through the through hole and through hole 111 to connect the upper bending fixture and the lower square right-angled U-shaped frame. During installation, it should be noted that the axes of the upper pressure head 112 of the upper bending fixture and the two lower pressure heads 113 of the lower bending fixture must remain parallel. Ultimately, the round rods of the upper and lower bending fixtures, the through hole 6 and smooth groove 5 of the upper square right-angled U-shaped frame, and the through hole 6 and smooth groove 5 of the lower square right-angled U-shaped frame are all concentrically arranged.
[0047] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.
[0048] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature.
[0049] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.
[0050] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.
[0051] In this utility model, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.
[0052] Although the above embodiments have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Any changes, modifications, substitutions and variations made to the above embodiments by those skilled in the art are within the protection scope of the present invention.
Claims
1. A universal testing machine fixture suitable for open high-temperature furnaces, characterized in that, include: A connecting rod, which is connected to the universal testing machine; A square right-angled U-shaped frame is connected to a connecting rod, and one end of the square right-angled U-shaped frame has a groove and the other end has a through hole; A clamp is mounted between two opposing square right-angled U-shaped frames via through holes and grooves.
2. The universal testing machine fixture for open high-temperature furnaces according to claim 1, characterized in that, There are two connecting rods, with one end of each rod facing the other and the other end connected to the universal testing machine.
3. The universal testing machine fixture for open-type high-temperature furnaces according to claim 2, characterized in that, Each end of the connecting rod has an inwardly extending threaded groove.
4. The universal testing machine fixture for open-type high-temperature furnaces according to claim 3, characterized in that, The square right-angled U-shaped frame includes a U-shaped part, a protruding end, and a smooth end. The protruding end and the smooth end are located at the two ends of the U-shaped part, respectively, and the protruding end is perpendicular to the smooth end.
5. The universal testing machine fixture for an open high-temperature furnace according to claim 4, characterized in that, The outer surface of the protruding end connected to the connecting rod is engraved with an external thread that matches the threaded groove, and the end of the protruding end away from the connecting rod is recessed inward to form a smooth groove.
6. The universal testing machine fixture for an open high-temperature furnace according to claim 5, characterized in that, The smooth end has a through hole at its end, and the central axis of the through hole coincides with the central axis of the smooth groove.
7. The universal testing machine fixture for an open high-temperature furnace according to claim 6, characterized in that, The square right-angled U-shaped frame is divided into an upper square right-angled U-shaped frame and a lower square right-angled U-shaped frame. The smooth end of the lower square right-angled U-shaped frame has a through hole on its side. The through hole passes through the through hole, and the central axis of the through hole is perpendicular to the central axis of the through hole. A pin is installed at the through hole.
8. The universal testing machine fixture for an open high-temperature furnace according to claim 7, characterized in that, The clamp is a compression clamp, which includes an upper compression clamp and a lower compression clamp. Both the upper and lower compression clamps include a disc and a round rod located at the center of the disc and perpendicular to the disc. The round rod passes through a through hole and a smooth groove and is connected to a square right-angled U-shaped frame. The round rod of the upper compression clamp has a through hole at one end near the disc, which cooperates with the through hole and pin in the square right-angled U-shaped frame.
9. The universal testing machine fixture for an open high-temperature furnace according to claim 7, characterized in that, The fixture is a shearing fixture, which includes an upper shearing fixture and a lower shearing fixture. The upper shearing fixture includes a shearing tool and a round rod, and the lower shearing fixture includes a fixing block and a round rod. The fixing block has a through hole perpendicular to the axis of the round rod. A fastening bolt is installed on the side of the fixing block through hole away from the round rod. The round rod passes through the through hole and a smooth groove and is connected to a square right-angled U-shaped frame. The round rod of the upper shearing fixture has a second through hole that matches the through hole and pin in the square right-angled U-shaped frame.
10. The universal testing machine fixture for an open high-temperature furnace according to claim 7, characterized in that, The clamp is a bending clamp, which includes an upper bending clamp and a lower bending clamp. The upper bending clamp includes a round rod and an upper pressure head, and the lower bending clamp includes a round rod and two lower pressure heads with a gap between them. The round rod passes through a through hole and a smooth groove and connects to a square right-angled U-shaped frame. The round rod of the upper bending clamp has a through hole three that matches the through hole and pin in the square right-angled U-shaped frame.