A casting component strength detection device

Abstract

This invention discloses a strength testing device for cast parts, relating to the field of cast parts testing technology. It includes an operating table, mounting frame, hydraulic cylinder, pressure head, fixed column, mounting base, support base, adjustment mechanism, positioning mechanism, and limiting mechanism. By setting up a positioning mechanism and a limiting mechanism, the invention pushes the displacement seat to contact the bottom end of the support base, placing the sample on the top of the support base. At this time, the movable seat can be pushed to move, and the limiting rods contact both ends of the sample. The distance between the two positioning rods is adjusted according to the width of the sample. During testing, the displacement seat is released, and it moves downwards under gravity. The two positioning rods rotate and contact both sides of the sample, positioning both sides of the sample. Simultaneously, the limiting rods are automatically fixed, positioning both ends of the sample, thus automatically positioning the sample and facilitating sample positioning during the testing process.

Description

Technical Field

[0001] This invention relates to the field of casting component testing technology, specifically a casting component strength testing device. Background Technology

[0002] Casting is a basic mechanical manufacturing process in which molten metal is poured into a mold cavity of a corresponding shape and then cooled and solidified. It can produce components with arbitrarily complex shapes, especially those with complex internal cavities. It is suitable for almost all types of alloys and the production requirements of parts of different sizes and batches. It has low overall manufacturing costs and high process flexibility. It is widely used in many fields such as automobiles, aerospace, machinery manufacturing, shipbuilding, and medical devices. Common products include engine cylinder blocks, cylinder heads, crankshafts, machine tool beds, and aero-engine blades. Depending on the precision, cost, and application scenarios, it is mainly divided into different process types such as sand casting, investment casting, pressure casting, low-pressure casting, and centrifugal casting.

[0003] Strength testing of cast parts is a core verification step to ensure their safety and performance. It needs to be combined with non-destructive testing and destructive mechanical testing, and carried out in accordance with the corresponding standards and specifications. Bending fatigue testing is a core testing item for long-term alternating load conditions in the strength testing of cast parts. It is mainly used to evaluate the durability of castings under cyclic bending stress and avoid fatigue fracture failure. The commonly used method is three-point bending / four-point bending loading, which applies cyclic bending load on a fatigue testing machine.

[0004] During bending fatigue testing, the sample is placed on two support seats, and the pressure head moves up and down to apply a cyclic bending load to the sample. However, during the testing process, the pressure head repeatedly contacts the sample, which can easily cause the sample to vibrate and shift its position, thus affecting the testing effect. In order to achieve the purpose of positioning the sample during the testing process, a strength testing device for cast parts is provided. Summary of the Invention

[0005] The purpose of this invention is to provide a strength testing device for cast parts in order to achieve the purpose of positioning the sample during the sample testing process.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a strength testing device for cast parts, comprising an operating table, a mounting frame fixedly connected to the top of the operating table, a hydraulic cylinder mounted on the top of the mounting frame, a pressure head connected to the output end of the hydraulic cylinder, a fixing column fixedly connected to the top of the operating table below the pressure head, a mounting base fixedly connected to the top of the fixing column, two support seats mounted on the mounting base, the position of the support seats being adjusted by an adjustment mechanism, the two sides of the test material being positioned by a positioning mechanism, and the two ends of the test material being positioned by a limiting mechanism.

[0007] The adjustment mechanism includes an adjustment groove symmetrically located at the top of the mounting base. A fixing groove is formed on the inner wall of the adjustment groove. The support base is slidably connected to the inner wall of the adjustment groove. A first rotating block is rotatably connected to one side of the support base. A first threaded rod is fixedly connected to the outer wall of the first rotating block. A toothed block is slidably connected to the outer wall of the first threaded rod. The toothed block is slidably connected to the interior of the support base. A first spur gear is rotatably connected to the bottom end of the toothed block inside the support base. A fixing block is slidably connected to the bottom end of the first spur gear inside the support base. One end of the fixing block extends to the outer wall of the support base.

[0008] As a further embodiment of the present invention: the positioning mechanism includes a vertical groove, which is formed at the bottom end of the support base. A displacement seat is provided below the support base. A vertical rod is fixedly connected to the top end of the displacement seat. The vertical rod is slidably connected to the inner wall of the vertical groove. Second rotating blocks are rotatably connected to both sides of the displacement seat. A second threaded rod is fixedly connected between the two second rotating blocks. A toothed rod is slidably connected to the outer wall of the second threaded rod. The toothed rod is slidably connected to the displacement seat. A horizontal groove is formed on the outer wall of the support base. A slider is symmetrically slidably connected to the inner wall of the horizontal groove. The toothed rod passes through the slider. A second spur gear is rotatably connected to the inner wall of the slider located on the outer wall of the toothed rod. A positioning rod is fixedly connected to one end of the second spur gear. A connecting plate is fixedly connected to one side of the bottom of the support base. A connecting seat is fixedly connected to one side of the displacement seat. A locking block is slidably connected to the inner side of the connecting seat. A first spring is connected between the locking block and the connecting seat.

[0009] As a further embodiment of the present invention: the limiting mechanism includes a movable seat, the movable seat being slidably connected to the inner wall of the adjusting groove, a limiting rod being fixedly connected to the top of the movable seat, a push plate being fixedly connected to the bottom of the displacement seat, a positioning block extending out of the movable seat being slidably connected inside the movable seat, a second spring being connected between the positioning block and the movable seat, and a pressing block being slidably connected inside the movable seat at the bottom of the positioning block, the pressing block extending below the movable seat.

[0010] As a further embodiment of the present invention: the outer wall of the support base is in contact with the inner wall of the adjustment groove, and the outer wall of the tooth block is provided with a first threaded hole, which matches the first threaded rod.

[0011] As a further embodiment of the present invention: the outer walls of both the tooth block and the fixing block are provided with first tooth grooves, the first tooth grooves mesh with the first spur gear, and the inner wall of the fixing groove is in contact with the outer wall of the fixing block.

[0012] As a further embodiment of the present invention: the inner wall of the vertical groove is in contact with the outer wall of the vertical rod, and the outer wall of the toothed rod is provided with a second tooth groove, which meshes with the second spur gear.

[0013] As a further embodiment of the present invention: the inner wall of the displacement seat is in contact with the outer wall of the bottom end of the toothed rod, the outer wall of the toothed rod is provided with a second threaded hole, the outer wall of the second threaded rod is symmetrically provided with external threads, and the external threads are matched with the second threaded hole.

[0014] As a further embodiment of the present invention: the end of the card block extending from the connecting seat is provided with a first inclined surface.

[0015] As a further embodiment of the present invention: the outer wall of the movable seat is in contact with the inner wall of the adjusting groove, and the outer wall of one end of the positioning block is in contact with the inner wall of the fixing groove.

[0016] As a further embodiment of the present invention: the bottom end of the positioning block is provided with a second inclined surface, and the top end of the extrusion block is in contact with the second inclined surface.

[0017] Compared with the prior art, the beneficial effects of the present invention are:

[0018] 1. By setting up a positioning mechanism and a limiting mechanism, the displacement seat is pushed to contact the bottom end of the support seat, and the sample is placed on the top of the support seat. At this time, the movable seat can be pushed to move, and the limiting rod contacts both ends of the sample. The distance between the two positioning rods is adjusted according to the width of the sample. When testing, the displacement seat is released, and the displacement seat moves downward under the action of gravity. The two positioning rods rotate and contact both sides of the sample, positioning both sides of the sample. At the same time, the limiting rods are automatically fixed, and the limiting rods position both ends of the sample, thus performing automatic positioning of the sample, which is convenient for positioning the sample during the testing process.

[0019] 2. By setting an adjustment mechanism, the second rotating block is rotated, which drives the second threaded rod to rotate. The rotation of the second threaded rod drives the two toothed rods to move in opposite directions. At this time, the slider slides in the transverse groove. The displacement of the slider drives the positioning rod to move, which makes it easy to adjust the distance between the two positioning rods, thereby adapting to inspection materials of different widths. Attached Figure Description

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

[0021] Figure 2 This is a schematic diagram of the mounting base of the present invention;

[0022] Figure 3 This is a partial cross-sectional view of the mounting base of the present invention;

[0023] Figure 4 This is a partial cross-sectional view of the support base of the present invention;

[0024] Figure 5 This is a schematic diagram of the support base of the present invention;

[0025] Figure 6 This is a schematic diagram of the displacement seat of the present invention;

[0026] Figure 7 This is a cross-sectional view of the displacement seat of the present invention;

[0027] Figure 8 This is a cross-sectional view of the slider of the present invention;

[0028] Figure 9 This is a schematic diagram of the structure of the movable seat of the present invention;

[0029] Figure 10 This is a cross-sectional view of the movable seat of the present invention.

[0030] In the diagram: 1. Control panel; 2. Mounting bracket; 3. Hydraulic cylinder; 4. Pressure head; 5. Fixed column; 6. Mounting base; 7. Adjustment mechanism; 701. Adjustment groove; 702. Fixed groove; 703. First rotating block; 704. First threaded rod; 705. Gear block; 706. First spur gear; 707. Fixed block; 8. Positioning mechanism; 801. Vertical groove; 802. Vertical rod; 803. Displacement seat; 804. Second rotating block 805. Second threaded rod; 806. Gear rack; 807. Second spur gear; 808. Positioning rod; 809. Slider; 810. Horizontal groove; 811. Connecting plate; 812. Connecting seat; 813. Locking block; 814. First spring; 9. Limiting mechanism; 901. Movable seat; 902. Limiting rod; 903. Push plate; 904. Positioning block; 905. Second spring; 906. Pressing block; 10. Support seat. Detailed Implementation

[0031] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this invention and simplifying the description, 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, and therefore should not be construed as a limitation of this invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In the description of this invention, it should be noted that unless otherwise explicitly specified and limited, the terms "installed," "connected," "linked," and "set up" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances. The following describes embodiments of the invention based on its overall structure.

[0033] Please see Figures 1 to 10In this embodiment of the invention, a strength testing device for cast parts includes an operating table 1. A mounting frame 2 is fixedly connected to the top of the operating table 1. A hydraulic cylinder 3 is mounted on the top of the mounting frame 2. A pressure head 4 is connected to the output end of the hydraulic cylinder 3. A fixing column 5 is fixedly connected to the top of the operating table 1 below the pressure head 4. A mounting base 6 is fixedly connected to the top of the fixing column 5. Two support seats 10 are mounted on the mounting base 6. The position of the support seats 10 is adjusted by an adjustment mechanism 7. The two sides of the test material are positioned by a positioning mechanism 8, and the two ends of the test material are positioned by a limiting mechanism 9.

[0034] In this embodiment: the sample is placed on the top of the two support seats 10, the hydraulic cylinder 3 operates to drive the pressure head 4 to move, the pressure head 4 moves up and down back and forth, the pressure head 4 contacts the sample, and the sample is subjected to bending fatigue test.

[0035] Please refer to this carefully. Figures 3 to 4 The adjustment mechanism 7 includes an adjustment groove 701, which is symmetrically opened at the top of the mounting base 6. The inner wall of the adjustment groove 701 is provided with a fixing groove 702. The support base 10 is slidably connected to the inner wall of the adjustment groove 701. A first rotating block 703 is rotatably connected to one side of the support base 10. A first threaded rod 704 is fixedly connected to the outer wall of the first rotating block 703. A toothed block 705 is slidably connected to the outer wall of the first threaded rod 704. The toothed block 705 is slidably connected to the inside of the support base 10. A first spur gear 706 is rotatably connected to the bottom end of the toothed block 705 inside the support base 10. A fixing block 707 is slidably connected to the bottom end of the first spur gear 706 inside the support base 10. One end of the fixing block 707 extends to the outer wall of the support base 10.

[0036] In this embodiment: when adjusting the position of the support base 10, the support base 10 is pushed to slide in the adjustment groove 701. After completion, the first rotating block 703 is rotated. The rotation of the first rotating block 703 drives the first threaded rod 704 to rotate. The rotation of the first threaded rod 704 drives the toothed block 705 to move. The movement of the toothed block 705 drives the first spur gear 706 to rotate. The rotation of the first spur gear 706 drives the fixing block 707 to move. The fixing block 707 moves and inserts into the fixing groove 702 to fix the position of the support base 10.

[0037] Please refer to this carefully. Figures 4 to 8The positioning mechanism 8 includes a vertical groove 801 located at the bottom of the support base 10. A displacement seat 803 is located below the support base 10. A vertical rod 802 is fixedly connected to the top of the displacement seat 803 and slidably connected to the inner wall of the vertical groove 801. Second rotating blocks 804 are rotatably connected to both sides of the displacement seat 803. A second threaded rod 805 is fixedly connected between the two second rotating blocks 804. A toothed rod 806 is slidably connected to the outer wall of the second threaded rod 805 and slidably connected to the displacement seat 803. A horizontal groove 8 is provided on the outer wall of the support base 10. 10. A slider 809 is symmetrically slidably connected to the inner wall of the transverse groove 810. A toothed rod 806 passes through the slider 809. The inside of the slider 809 is rotatably connected to the outer wall of the toothed rod 806. A positioning rod 808 is fixedly connected to one end of the second spur gear 807. A connecting plate 811 is fixedly connected to one side of the bottom of the support base 10. A connecting base 812 is fixedly connected to one side of the displacement base 803. A locking block 813 is slidably connected inside the connecting base 812. A first spring 814 is connected between the locking block 813 and the connecting base 812.

[0038] In this embodiment: the sample is placed on the top of the support base 10, and then the push block 813 is displaced and separated from the connecting plate 811. The displacement seat 803 is displaced downward under the action of gravity. The vertical rod 802 slides in the vertical groove 801 to limit the movement direction of the displacement seat 803. The downward displacement of the displacement seat 803 drives the rack 806 to move. The displacement of the rack 806 drives the second spur gear 807 to rotate. The rotation of the second spur gear 807 drives the positioning rod 808 to rotate. The positioning rod 808 rotates and contacts both sides of the sample to perform positioning operation on both sides of the sample. Whenever the pressure head 4 separates from the sample, the gravity of the displacement seat 803 drives the two positioning rods 808 to rotate to perform positioning operation on both sides of the sample.

[0039] After the test is completed, the displacement seat 803 is pushed upward to move, and the locking block 813 contacts the connecting plate 811. The locking block 813 is displaced under force, which squeezes the first spring 814. When the support seat 10 contacts the displacement seat 803, the locking block 813 is displaced and reset by the elastic force of the first spring 814. The locking block 813 contacts the top of the connecting plate 811 to perform the positioning operation of the displacement seat 803.

[0040] When adjusting the distance between the two positioning rods 808, the second rotating block 804 is rotated. The rotation of the second rotating block 804 drives the second threaded rod 805 to rotate. The rotation of the second threaded rod 805 drives the two toothed rods 806 to move in opposite directions. At this time, the slider 809 slides in the transverse groove 810. The displacement of the slider 809 drives the positioning rods 808 to move, which facilitates the adjustment of the distance between the two positioning rods 808, thereby adapting to inspection materials of different widths.

[0041] Please refer to this carefully. Figures 9 to 10 The limiting mechanism 9 includes a movable seat 901, which is slidably connected to the inner wall of the adjusting groove 701. A limiting rod 902 is fixedly connected to the top of the movable seat 901. A push plate 903 is fixedly connected to the bottom of the displacement seat 803. A positioning block 904 extending out of the movable seat 901 is slidably connected inside the movable seat 901. A second spring 905 is connected between the positioning block 904 and the movable seat 901. A pressing block 906 is slidably connected to the bottom of the positioning block 904 inside the movable seat 901. The pressing block 906 extends to the bottom of the movable seat 901.

[0042] In this embodiment: when the displacement seat 803 contacts the bottom end of the support seat 10, the displacement of the displacement seat 803 drives the push plate 903 to move, the push plate 903 moves the extrusion block 906 to move, the extrusion block 906 moves the positioning block 904 to move, causing the second spring 905 to be extruded, and the positioning block 904 moves out of the fixing groove 702, canceling the positioning of the movable seat 901; at this time, the movable seat 901 can be pushed to slide in the adjustment groove 701, the displacement of the movable seat 901 drives the limit rod 902 to move, the limit rod 902 moves and contacts both ends of the sample, when the displacement seat 803 moves downward, the push plate 903 separates from the extrusion block 906, the positioning block 904 is engaged into the fixing groove 702 by the elastic force of the second spring 905, and the movable seat 901 and the limit rod 902 are fixed, and the limit rod 902 is positioned at both ends of the sample;

[0043] The displacement seat 803 is pushed to contact the bottom end of the support seat 10, and the sample is placed on the top of the support seat 10. At this time, the movable seat 901 can be pushed to move, and the limiting rod 902 contacts both ends of the sample. The distance between the two positioning rods 808 is adjusted according to the width of the sample. When testing, the displacement seat 803 is released, and the displacement seat 803 moves downward under the action of gravity. The two positioning rods 808 rotate and contact both sides of the sample to position both sides of the sample. At the same time, the limiting rod 902 is automatically fixed, and the limiting rod 902 positions both ends of the sample, thereby performing automatic positioning of the sample, which is convenient for positioning the sample during the testing process.

[0044] Please refer to this carefully. Figures 3 to 4 The outer wall of the support base 10 fits against the inner wall of the adjustment groove 701, and the outer wall of the tooth block 705 is provided with a first threaded hole, which matches the first threaded rod 704.

[0045] In this embodiment: the support seat 10 is pushed to slide in the adjustment groove 701. After completion, the first rotating block 703 is rotated. The rotation of the first rotating block 703 drives the first threaded rod 704 to rotate. The rotation of the first threaded rod 704 drives the toothed block 705 to move.

[0046] Please refer to this carefully. Figures 3 to 4 Both the toothed block 705 and the fixed block 707 have a first tooth groove on their outer walls. The first tooth groove meshes with the first spur gear 706. The inner wall of the fixed groove 702 fits against the outer wall of the fixed block 707.

[0047] In this embodiment: the displacement of the tooth block 705 drives the first spur gear 706 to rotate, the rotation of the first spur gear 706 drives the fixed block 707 to move, and the fixed block 707 moves into the fixed groove 702 to fix the position of the support seat 10.

[0048] Please refer to this carefully. Figures 4 to 8 The inner wall of the vertical groove 801 fits against the outer wall of the vertical rod 802, and the outer wall of the toothed rod 806 is provided with a second tooth groove, which meshes with the second spur gear 807.

[0049] In this embodiment: the displacement seat 803 moves downward under the action of gravity, the vertical rod 802 slides in the vertical groove 801 to limit the movement direction of the displacement seat 803, the downward displacement of the displacement seat 803 drives the rack 806 to move, the displacement of the rack 806 drives the second spur gear 807 to rotate, and the rotation of the second spur gear 807 drives the positioning rod 808 to rotate.

[0050] Please refer to this carefully. Figures 4 to 8 The inner wall of the displacement seat 803 fits against the outer wall of the bottom end of the toothed rod 806. The outer wall of the toothed rod 806 is provided with a second threaded hole. The outer wall of the second threaded rod 805 is symmetrically provided with external threads, and the external threads match the second threaded hole.

[0051] In this embodiment: when adjusting the distance between the two positioning rods 808, the second rotating block 804 is rotated. The rotation of the second rotating block 804 drives the second threaded rod 805 to rotate. The rotation of the second threaded rod 805 drives the two toothed rods 806 to move in opposite directions. At this time, the slider 809 slides in the transverse groove 810. The displacement of the slider 809 drives the positioning rods 808 to move, which facilitates the adjustment of the distance between the two positioning rods 808, thereby adapting to inspection materials of different widths.

[0052] Please refer to this carefully. Figures 4 to 8 The end of the card block 813 extending from the connecting seat 812 is provided with a first inclined surface.

[0053] In this embodiment: the displacement seat 803 is pushed upward to move, the locking block 813 contacts the connecting plate 811, the locking block 813 is displaced under force, and the first spring 814 is squeezed. When the support seat 10 contacts the displacement seat 803, the locking block 813 is displaced and reset by the elastic force of the first spring 814. The locking block 813 contacts the top of the connecting plate 811, and the position of the displacement seat 803 is positioned.

[0054] Please refer to this carefully. Figures 9 to 10 The outer wall of the movable seat 901 is in contact with the inner wall of the adjusting groove 701, and the outer wall of one end of the positioning block 904 is in contact with the inner wall of the fixing groove 702.

[0055] In this embodiment: the movable seat 901 is pushed to slide in the adjustment groove 701. The displacement of the movable seat 901 causes the limiting rod 902 to move. The limiting rod 902 contacts both ends of the sample. When the displacement seat 803 moves downward, the push plate 903 separates from the pressing block 906. The positioning block 904 is engaged in the fixing groove 702 by the elastic force of the second spring 905, and the movable seat 901 and the limiting rod 902 are fixed.

[0056] Please refer to this carefully. Figures 9 to 10 The bottom end of the positioning block 904 is provided with a second inclined surface, and the top end of the extrusion block 906 is in contact with the second inclined surface.

[0057] In this embodiment: the displacement seat 803 moves to drive the push plate 903 to move, the displacement of the push plate 903 drives the extrusion block 906 to move, and the displacement of the extrusion block 906 drives the positioning block 904 to move.

[0058] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A strength testing device for cast parts, characterized in that, The system includes an operating table (1), with a mounting frame (2) fixedly connected to the top of the operating table (1). A hydraulic cylinder (3) is mounted on the top of the mounting frame (2), and a pressure head (4) is connected to the output end of the hydraulic cylinder (3). A fixing column (5) is fixedly connected to the top of the operating table (1) below the pressure head (4). A mounting base (6) is fixedly connected to the top of the fixing column (5). Two support seats (10) are mounted on the mounting base (6). The position of the support seats (10) is adjusted by an adjustment mechanism (7). The two sides of the sample are positioned by a positioning mechanism (8), and the two ends of the sample are positioned by a limiting mechanism (9). The adjustment mechanism (7) includes an adjustment groove (701), which is symmetrically opened at the top of the mounting base (6). The inner wall of the adjustment groove (701) is provided with a fixing groove (702). The support base (10) is slidably connected to the inner wall of the adjustment groove (701). A first rotating block (703) is rotatably connected to one side of the support base (10). A first threaded rod (704) is fixedly connected to the outer wall of the first rotating block (703). A toothed block (705) is slidably connected to the outer wall of the first threaded rod (704). The toothed block (705) is slidably connected to the inside of the support base (10). A first spur gear (706) is rotatably connected to the bottom end of the toothed block (705) inside the support base (10). A fixing block (707) is slidably connected to the bottom end of the first spur gear (706) inside the support base (10). One end of the fixing block (707) extends to the outer wall of the support base (10).

2. The strength testing device for cast parts according to claim 1, characterized in that, The positioning mechanism (8) includes a vertical groove (801) at the bottom of the support base (10). A displacement seat (803) is provided below the support base (10). A vertical rod (802) is fixedly connected to the top of the displacement seat (803). The vertical rod (802) is slidably connected to the inner wall of the vertical groove (801). Second rotating blocks (804) are rotatably connected to both sides of the displacement seat (803). A second threaded rod (805) is fixedly connected between the two second rotating blocks (804). A toothed rod (806) is slidably connected to the outer wall of the second threaded rod (805). The toothed rod (806) is slidably connected to the displacement seat (803). A horizontal groove is provided on the outer wall of the support base (10). 810), the inner wall of the transverse groove (810) is symmetrically slidably connected to a slider (809), the rack (806) passes through the slider (809), the inside of the slider (809) is rotatably connected to the outer wall of the rack (806), one end of the second spur gear (807) is fixedly connected to a positioning rod (808), one side of the bottom of the support seat (10) is fixedly connected to a connecting plate (811), one side of the displacement seat (803) is fixedly connected to a connecting seat (812), the inside of the connecting seat (812) is slidably connected to a locking block (813) that passes through the connecting seat (812), and a first spring (814) is connected between the locking block (813) and the connecting seat (812).

3. The strength testing device for cast parts according to claim 2, characterized in that, The limiting mechanism (9) includes a movable seat (901), which is slidably connected to the inner wall of the adjusting groove (701). A limiting rod (902) is fixedly connected to the top of the movable seat (901), and a push plate (903) is fixedly connected to the bottom of the displacement seat (803). A positioning block (904) extending out of the movable seat (901) is slidably connected inside the movable seat (901). A second spring (905) is connected between the positioning block (904) and the movable seat (901). A pressing block (906) is slidably connected inside the movable seat (901) at the bottom of the positioning block (904). The pressing block (906) extends to the bottom of the movable seat (901).

4. The strength testing device for cast parts according to claim 1, characterized in that, The outer wall of the support base (10) is in contact with the inner wall of the adjustment groove (701), and the outer wall of the tooth block (705) is provided with a first threaded hole, which matches the first threaded rod (704).

5. The strength testing device for cast parts according to claim 1, characterized in that, The outer walls of the toothed block (705) and the fixed block (707) are both provided with first tooth grooves, the first tooth grooves mesh with the first spur gear (706), and the inner wall of the fixed groove (702) is in contact with the outer wall of the fixed block (707).

6. The strength testing device for cast parts according to claim 2, characterized in that, The inner wall of the vertical groove (801) is in contact with the outer wall of the vertical rod (802), and the outer wall of the toothed rod (806) is provided with a second tooth groove, which meshes with the second spur gear (807).

7. The strength testing device for cast parts according to claim 2, characterized in that, The inner wall of the displacement seat (803) is in contact with the outer wall of the bottom end of the toothed rod (806). The outer wall of the toothed rod (806) is provided with a second threaded hole. The outer wall of the second threaded rod (805) is symmetrically provided with external threads, and the external threads are matched with the second threaded hole.

8. The strength testing device for cast parts according to claim 2, characterized in that, The card block (813) has a first inclined surface extending from one end of the connecting seat (812).

9. The strength testing device for cast parts according to claim 3, characterized in that, The outer wall of the movable seat (901) is in contact with the inner wall of the adjusting groove (701), and the outer wall of one end of the positioning block (904) is in contact with the inner wall of the fixing groove (702).

10. A strength testing device for cast parts according to claim 3, characterized in that, The bottom end of the positioning block (904) is provided with a second inclined surface, and the top end of the pressing block (906) is in contact with the second inclined surface.

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