A hand-operated hydraulic stress calibrator

Abstract

This utility model belongs to the technical field of stress calibration instruments, and particularly relates to a manual hydraulic stress calibrator, including a frame and a hydraulic mechanism mounted on one side of the frame. The frame is equipped with a load-bearing mechanism and a load sensor. The load-bearing mechanism is installed at the movable end of the hydraulic mechanism and located between the movable end of the hydraulic mechanism and the load sensor. The load-bearing mechanism is used to place the test piece. Alignment clamping mechanisms are also provided at the front and rear ends of the frame. These alignment clamping mechanisms are used to adjust the position of the load-bearing mechanism so that the load sensor and the test piece are aligned on the same axis when the hydraulic mechanism is working. By setting up the alignment clamping mechanism, the problem of eccentric force caused by the misalignment of the force application axis and the sample center axis in traditional manual hydraulic stress calibrators is effectively alleviated, improving the accuracy and reliability of the calibration results, while reducing the tedious manual adjustment process that relies on operator experience.

Description

Technical Field

[0001] This utility model belongs to the technical field of stress calibration instruments, and in particular relates to a manual hydraulic stress calibration instrument. Background Technology

[0002] A manual hydraulic stress calibrator is a specialized device used for metrological calibration of force sensors, force gauges, and other similar equipment. It typically consists of a rigid base, column, hydraulic cylinder, and top force application unit, all connected to a separate manual hydraulic pump via hoses. During calibration, the operator manipulates the hydraulic pump to force hydraulic oil into the cylinder, driving the piston to generate an upward thrust. This thrust is applied to the sample being calibrated via a support platform, thus completing the calibration process. This structure relies on manual operation and hydraulic transmission, offering advantages such as low cost and ease of portability.

[0003] However, the existing structure described above has an inherent problem that significantly affects measurement accuracy in practical applications—the eccentricity problem. Specifically, if the central axis of the calibrated sample does not coincide with the force axis generated by the hydraulic cylinder, a lateral bending moment or eccentric load will be introduced, resulting in the force acting on the sample not being the pure axial standard force value. This eccentricity force induces additional bending stress, causing a deviation between the instrument display value and the actual applied force value, severely affecting the accuracy and reliability of the calibration results. In existing technologies, solving this problem usually requires operators to repeatedly adjust the installation position of the calibrated sample based on experience, a cumbersome and time-consuming process.

[0004] Therefore, there is an urgent need for a manual hydraulic stress calibrator to solve the problems of existing stress calibrators that are prone to generating eccentric forces, requiring manual adjustment by operators, resulting in a cumbersome adjustment process and low adjustment accuracy. Utility Model Content

[0005] The purpose of this invention is to provide a manual hydraulic stress calibrator to solve the problems of the existing stress calibrators, which are prone to generating eccentric forces and require manual adjustment by operators, resulting in a cumbersome adjustment process and low adjustment accuracy.

[0006] To achieve the above objectives, this utility model provides the following solution:

[0007] A manual hydraulic stress calibrator includes a frame and a hydraulic mechanism mounted on one side of the frame. The frame is provided with a load-bearing mechanism and a load sensor. The load-bearing mechanism is mounted at the movable end of the hydraulic mechanism and located between the movable end of the hydraulic mechanism and the load sensor. The load-bearing mechanism is used to place the workpiece to be tested. The front and rear ends of the frame are also provided with centering clamping mechanisms. The centering clamping mechanisms are used to adjust the position of the load-bearing mechanism so that when the hydraulic mechanism is working, the load sensor and the workpiece to be tested are located on the same axis.

[0008] In one specific implementation, the hydraulic mechanism includes an oil tank located on one side of the frame, a manual oil pump connected to the oil tank, a fixed end of a hydraulic cylinder fixedly connected to the frame, and the hydraulic cylinder and the oil tank connected by an oil pipe. When in use, the operator can manually press the manual oil pump to pump the oil in the oil tank into the hydraulic cylinder through the oil pipe.

[0009] In one specific implementation, the bearing mechanism includes a bearing platform fixedly connected to the movable end of the hydraulic cylinder. An arc-shaped groove is provided on the bearing platform, and a bearing column is placed in the arc-shaped groove. A bearing groove is provided on the bearing column, and the bearing groove is used to place the part to be tested.

[0010] In one specific embodiment, the centering clamp mechanism includes a bracket fixedly connected to the frame, a support platform fixedly connected to the top surface of the bracket, a threaded rod rotatably connected to the center of the top surface of the support platform, a first centering clamp block slidably connected to the threaded rod, the first centering clamp block being located on the side close to the support platform, a second centering clamp block being fixedly connected to the frame via a fixing block, the first centering clamp block and the second centering clamp block being vertically corresponding, and the two ends of the bearing column being located between the first centering clamp block and the second centering clamp block.

[0011] In one specific implementation, an adjusting nut is fixedly connected to the end of the threaded rod away from the support platform through the frame. The operator can manually rotate the adjusting nut to control the rotation of the threaded rod, thereby controlling the first centering clamp to slide along the threaded rod.

[0012] In one specific implementation, a slider is slidably connected to the threaded rod, and the first centering clamp is detachably connected to the slider.

[0013] In one specific implementation, the top surface of the slider is provided with a through hole, and the bottom surface of the first centering block is fixedly connected with a support column, which is interference-fitted inside the through hole.

[0014] In one specific implementation, the fixing block has a circular hole with a diameter larger than the outer diameter of the threaded rod, which is used to ensure that the threaded rod can rotate freely within the circular hole without interfering with the fixing block.

[0015] In one specific implementation, two guide posts are provided between the support platform and the frame. The two guide posts are symmetrically distributed on both sides of the threaded rod, and the slider is slidably connected to the guide posts.

[0016] In one specific implementation, the first centering clamping block has a first clamping groove, and the second centering clamping block has a second clamping groove. The first clamping groove and the second clamping groove are vertically corresponding and both are arc-shaped.

[0017] Compared with the prior art, the present invention has the following advantages and technical effects:

[0018] This invention effectively alleviates the eccentric force problem caused by the misalignment of the force application axis and the sample center axis in traditional manual hydraulic stress calibrators by setting a centering clamp mechanism. This mechanism can adjust the position of the bearing mechanism to ensure that the load sensor, the test piece, and the moving end of the hydraulic mechanism are on the same axis, thereby significantly reducing the measurement error introduced by lateral bending moment or eccentric load, improving the accuracy and reliability of calibration results, and reducing the tedious manual adjustment process that relies on the operator's experience, thus improving calibration efficiency and ensuring operational consistency. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the structure of the present invention. Figure 1 ;

[0021] Figure 2 This is a schematic diagram of the centering clamp mechanism of this utility model;

[0022] Figure 3 This is a schematic diagram of the structure of the present invention. Figure 2 ;

[0023] Figure 4 This is a schematic diagram of the structure of the first centering clamping block in its working state;

[0024] Figure 5 This is a schematic diagram of the structure of the second centering clamping block in its working state;

[0025] The components include: 1. Frame; 2. Hydraulic mechanism; 3. Support platform; 4. Support column; 5. Support groove; 6. Load sensor; 7. Centering clamp mechanism; 201. Oil tank; 202. Manual oil pump; 203. Oil pipe; 204. Hydraulic cylinder; 701. Bracket; 702. Support platform; 703. Slider; 704. Through hole; 705. First centering clamp block; 706. Support column; 707. First clamping groove; 708. Fixing block; 709. Second centering clamp block; 710. Second clamping groove; 711. Threaded rod; 712. Guide column; 713. Adjusting nut. Detailed Implementation

[0026] 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.

[0027] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0028] Implementation 1:

[0029] Reference Figure 1-5 This embodiment discloses a manual hydraulic stress calibrator, including a frame 1 and a hydraulic mechanism 2 installed on one side of the frame 1. The frame 1 is provided with a bearing mechanism and a load sensor 6. The bearing mechanism is installed at the movable end of the hydraulic mechanism 2 and is located between the movable end of the hydraulic mechanism 2 and the load sensor 6. The bearing mechanism is used to place the test piece. The front and rear ends of the frame 1 are also provided with centering clamping mechanisms 7. The centering clamping mechanisms 7 are used to adjust the position of the bearing mechanism so that when the hydraulic mechanism 2 is working, the load sensor 6 and the test piece are located on the same axis.

[0030] By setting up the centering clamp mechanism 7, the problem of eccentric force caused by the misalignment of the force application axis and the center axis of the sample in the traditional manual hydraulic stress calibrator is effectively alleviated. This mechanism can adjust the position of the bearing mechanism to ensure that the load sensor 6, the test piece and the moving end of the hydraulic mechanism are on the same axis, thereby significantly reducing the measurement error introduced by lateral bending moment or eccentric load, improving the accuracy and reliability of calibration results, and reducing the tedious manual adjustment process that relies on the operator's experience, thus improving calibration efficiency and ensuring the consistency of operation.

[0031] The hydraulic mechanism 2 includes an oil tank 201 located on one side of the frame 1, with a manual oil pump 202 connected to the oil tank 201. A fixed end of a hydraulic cylinder 204 is fixedly connected to the frame 1. The hydraulic cylinder 204 and the oil tank 201 are connected via an oil pipe 203. When in use, the operator manually presses the manual oil pump 202 to pump the oil in the oil tank 201 into the hydraulic cylinder 204 through the oil pipe 203. The bearing mechanism includes a bearing platform 3 fixedly connected to the movable end of the hydraulic cylinder 204. An arc-shaped groove is formed on the bearing platform 3, and a bearing column 4 is placed in the arc-shaped groove. A bearing groove 5 is formed on the bearing column 4, and the bearing groove 5 is used to place the part to be tested.

[0032] The oil tank 201 serves as a storage container for hydraulic oil. It connects to the suction end of the manual oil pump 202 via its inlet. The manual oil pump typically includes a pump body, handle, check valve, and safety valve. Its suction pipe extends 200mm below the oil level in the tank to prevent cavitation. The outlet of the manual oil pump 202 connects to the inlet of the hydraulic cylinder 204 via a high-pressure oil pipe 203. Both ends of the oil pipe 203 must use reliably sealed connectors (such as G3 / 8 or G1 / 4 threaded interfaces) to prevent leakage or air ingress. During operation, the pump handle is manually controlled, converting mechanical energy into hydraulic energy. The oil in the tank 201 is drawn into the pump chamber and pressurized. The check valve controls the directional flow of the oil, which is then delivered to the hydraulic cylinder 204 via the oil pipe 203 to drive the piston upward. Existing models include manual pump series from companies like Hongtu Hydraulics or Zhengtu Hydraulics (e.g., 63MPa high-pressure type), but the specific selection must be matched to the pressure and flow requirements of the calibrator.

[0033] Example 2:

[0034] Reference Figure 2 The centering clamping mechanism 7 includes a bracket 701 fixedly connected to the frame 1. A support platform 702 is fixedly connected to the top surface of the bracket 701. A threaded rod 711 is rotatably connected to the center of the top surface of the support platform 702. A first centering clamping block 705 is slidably connected to the threaded rod 711. The first centering clamping block 705 is located on the side close to the support platform 702. A second centering clamping block 709 is fixedly connected to the frame 1 via a fixing block 708. The first centering clamping block 705 and the second centering clamping block 709 are vertically corresponding, and the two ends of the bearing column 4 are located between the first centering clamping block 705 and the second centering clamping block 709. A slider 703 is slidably connected to the threaded rod 711. The first centering clamping block 705 and the slider 703 are detachably connected. The first centering clamping block 705 has a first clamping groove 707, and the second centering clamping block 709 has a second clamping groove 710. The first clamping groove 707 and the second clamping groove 710 are vertically corresponding and both are arc-shaped. The arc-shaped arrangement of the first clamping groove 707 and the second clamping groove 710 can effectively fit the surface of the cylindrical bearing column, reduce stress concentration and provide uniform clamping force.

[0035] The fixing block 708 has a circular hole with a diameter larger than the outer diameter of the threaded rod 711. This ensures that the threaded rod 711 can rotate freely within the circular hole without interfering with the fixing block 708. The circular hole structure on the fixing block 708 avoids mechanical interference when the threaded rod 711 rotates, ensuring the smoothness of the adjustment process.

[0036] The top surface of the slider 703 has a through hole 704, and the bottom surface of the first centering clamping block 705 is fixedly connected to a support column 706. The support column 706 is interference-fitted inside the through hole 704. The interference fit between the slider 703 and the support column 706 ensures the stability of the clamping block positioning and the convenience of disassembly and maintenance.

[0037] The end of the threaded rod 711 away from the support platform 702 passes through the frame 1 and is fixedly connected to an adjusting nut 713. The operator can manually rotate the adjusting nut 713 to control the rotation of the threaded rod 711, thereby controlling the first centering clamp 705 to slide along the threaded rod 711.

[0038] The usage process is as follows:

[0039] Reference Figure 4 The threaded rod 711 is driven to rotate by manually rotating the adjusting nut 713, thereby controlling the first centering clamp 705 to slide linearly along the threaded rod 711. At this time, the first centering clamp 705 slides upward until the first clamping grooves 707 of both first centering clamps 705 are in contact with both ends of the bearing column 4, reducing the offset of the bearing column 4 and completing the first centering process.

[0040] Reference Figure 5 The piston of the hydraulic cylinder 204 is controlled to move upward by the manual oil pump 202, which drives the test piece located on the bearing groove 5 to move upward until it touches the load sensor 6. When the test piece touches the load sensor 6, the two ends of the bearing column 4 will contact the second clamping groove 710, reducing the offset of the bearing column 4 and completing the second centering process.

[0041] The centering clamp mechanism 7 effectively reduces the eccentricity error between the bearing column 4 and the force application axis through two precise centering processes (manual adjustment of the first centering clamp 705 for pre-positioning + automatic correction of the second centering clamp 709 after hydraulic lifting) and the arc-shaped clamping groove design. This ensures that the load sensor 6, the test piece, and the hydraulic mechanism are coaxial, thereby significantly reducing the measurement deviation introduced by the eccentric force, improving the calibration accuracy and reliability, and reducing the tedious problem of traditional calibrators relying on repeated manual adjustments.

[0042] Example 3:

[0043] Two guide posts 712 are provided between the support platform 702 and the frame 1. The two guide posts 712 are symmetrically distributed on both sides of the threaded rod 711, and the slider 703 is slidably connected to the guide posts 712.

[0044] By symmetrically setting two guide columns 712 between the support platform 702 and the frame 1, and forming a sliding connection with the slider 703, the rigidity and motion stability of the mechanism are enhanced. The guide columns are symmetrically distributed on both sides of the threaded rod 711, which can reduce the radial off-center load torque and lateral force generated by the slider 703, and ensure that the slider 703 only makes linear movement along the axial direction, thereby reducing the bending deformation and wear of the threaded rod 711 and extending its service life.

[0045] In the description of this utility model, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0046] The embodiments described above are merely preferred embodiments of the present utility model and are not intended to limit the scope of the present utility model. Various modifications and improvements made to the technical solutions of the present utility model by those skilled in the art without departing from the spirit of the present utility model should fall within the protection scope defined by the claims of the present utility model.

Claims

1. A manual hydraulic stress calibrator, characterized in that: The device includes a frame (1) and a hydraulic mechanism (2) installed on one side of the frame (1). The frame (1) is provided with a bearing mechanism and a load sensor (6). The bearing mechanism is installed at the movable end of the hydraulic mechanism (2) and is located between the movable end of the hydraulic mechanism (2) and the load sensor (6). The bearing mechanism is used to place the test piece. The frame (1) is also provided with a centering clamp mechanism (7) at both ends. The centering clamp mechanism (7) is used to adjust the position of the bearing mechanism so that when the hydraulic mechanism (2) is working, the load sensor (6) and the test piece are located on the same axis.

2. The manual hydraulic stress calibrator according to claim 1, characterized in that: The hydraulic mechanism (2) includes an oil tank (201) located on one side of the frame (1). A manual oil pump (202) is connected to the oil tank (201). The fixed end of a hydraulic cylinder (204) is fixedly connected to the frame (1). The hydraulic cylinder (204) and the oil tank (201) are connected through an oil pipe (203). When the operator uses it, he / she can manually press the manual oil pump (202) to pump the oil in the oil tank (201) into the hydraulic cylinder (204) through the oil pipe (203).

3. A manual hydraulic stress calibrator according to claim 2, characterized in that: The bearing mechanism includes a bearing platform (3) fixedly connected to the movable end of the hydraulic cylinder (204). An arc-shaped groove is provided on the bearing platform (3), and a bearing column (4) is placed in the arc-shaped groove. A bearing groove (5) is provided on the bearing column (4), and the bearing groove (5) is used to place the test piece.

4. A manual hydraulic stress calibrator according to claim 3, characterized in that: The centering clamp mechanism (7) includes a bracket (701) fixedly connected to the frame (1). A support platform (702) is fixedly connected to the top surface of the bracket (701). A threaded rod (711) is rotatably connected to the middle of the top surface of the support platform (702). A first centering clamp (705) is slidably connected to the threaded rod (711). The first centering clamp (705) is located on the side close to the support platform (702). A second centering clamp (709) is fixedly connected to the frame (1) through a fixing block (708). The first centering clamp (705) and the second centering clamp (709) are vertically corresponding. The two ends of the bearing column (4) are located between the first centering clamp (705) and the second centering clamp (709).

5. A manual hydraulic stress calibrator according to claim 4, characterized in that: The end of the threaded rod (711) away from the support platform (702) passes through the frame (1) and is fixedly connected to an adjusting nut (713). The operator can manually rotate the adjusting nut (713) to control the rotation of the threaded rod (711) and thus control the first centering clamp (705) to slide along the threaded rod (711).

6. A manual hydraulic stress calibrator according to claim 4, characterized in that: A slider (703) is slidably connected to the threaded rod (711), and the first centering clamp (705) is detachably connected to the slider (703).

7. A manual hydraulic stress calibrator according to claim 6, characterized in that: The top surface of the slider (703) is provided with a through hole (704), and the bottom surface of the first centering block (705) is fixedly connected with a support column (706), which is interference-fitted inside the through hole (704).

8. A manual hydraulic stress calibrator according to claim 4, characterized in that: The fixing block (708) has a circular hole with a diameter larger than the outer diameter of the threaded rod (711) to ensure that the threaded rod (711) can rotate freely in the circular hole without interfering with the fixing block (708).

9. A manual hydraulic stress calibrator according to claim 6, characterized in that: Two guide posts (712) are provided between the support platform (702) and the frame (1). The two guide posts (712) are symmetrically distributed on both sides of the threaded rod (711). The slider (703) is slidably connected to the guide posts (712).

10. A manual hydraulic stress calibrator according to claim 4, characterized in that: The first centering clamping block (705) has a first clamping groove (707), and the second centering clamping block (709) has a second clamping groove (710). The first clamping groove (707) and the second clamping groove (710) are vertically corresponding and both are arc-shaped.

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