Flexural strength testing machine for testing the strength of steel bars

Abstract

The present invention provides a flexural strength testing machine for testing the strength of steel bars, including a workbench and a housing fixed on the top of the workbench. A loading component for providing a load is arranged inside the housing; a driving material pushing component, which is arranged inside the housing and is located on one side of the loading component. A feeding housing is arranged on the other side of the driving material pushing component; a step feeding component, which is arranged on the feeding housing. The driving material pushing component pushes the workpiece to be tested inside the feeding housing onto the placing fulcrum, and the step feeding component releases one workpiece to be tested at a time under the transmission of the driving material pushing component. The driving material pushing component and the step feeding component can realize automatic feeding in the flexural strength test of steel bars, facilitate the detection of batches of steel bars, reduce the labor intensity of operators, and improve the test efficiency.

Description

Technical Field

[0001] The present invention relates to the detection of the flexural strength of materials, and specifically to a flexural strength testing machine for testing the strength of steel bars. Background Art

[0002] The flexural strength detection of steel bars is a method for evaluating the resistance of steel bars under bending loads, and is usually used to ensure that steel bars meet the quality standards of construction projects. The three-point bending testing machine is a common testing machine. The loading part of the three-point bending testing machine is in the middle of the specimen, and the supporting points are placed at both ends.

[0003] However, the above-mentioned testing equipment generally requires manual feeding, placing the steel bars on the supporting points. However, in actual production and life, the detection of steel bars is all sampling detection, that is, a large number of detection samples need to be drawn from a batch of steel bar materials to objectively evaluate the quality of this batch of steel bar materials. Therefore, generally when the flexural strength of steel bars needs to be detected, a large number of detections are required. Therefore, the efficiency of manual feeding is low and does not meet the efficiency requirements of detection.

[0004] Therefore, in view of the above problems, a flexural strength testing machine for testing the strength of steel bars is provided. Summary of the Invention

[0005] The present invention provides a flexural strength testing machine for testing the strength of steel bars to solve the problems of low efficiency of manual feeding required by traditional testing machines and different shapes of the end parts in contact with steel bars on the loading part during actual detection.

[0006] When detecting the flexural strength of steel bars, different shapes of the loading ends in contact with the steel bars have different effects, so different shapes of loading ends may be required.

[0007] The present invention solves the above technical problems through the following technical solutions:

[0008] The present invention provides a flexural strength testing machine for testing the strength of steel bars, including a workbench and a housing fixed on the top of the workbench. A loading component for providing a load is arranged inside the housing. The workbench at the bottom of the loading component is of a hollow structure, and an installation frame is arranged at the bottom of the hollow part. Two symmetrically arranged placing support points are arranged on the installation frame;

[0009] A driving material pushing component, which is arranged inside the housing and is located on one side of the loading component. A feeding shell is arranged on the other side of the driving material pushing component;

[0010] A stepping feeding component, which is arranged on the feeding shell. The driving material pushing component pushes the workpiece to be tested inside the feeding shell onto the placing support points, and the stepping feeding component releases one workpiece to be tested at a time under the transmission of the driving material pushing component.

[0011] In the technical solution, a guide assembly is arranged around the driving pusher assembly, and the guide assembly includes an arc-shaped limit rail, both ends of the limit rail are connected to transition rails, and the two transition rails are connected by two sections of symmetrically arranged guide rails, and a closed loop is formed between the limit rail, the transition rail and the guide rail, and the transition rail and the guide rail are both arc-shaped structures and extend toward one side of the placement fulcrum;

[0012] The pushing part on the driving pushing assembly moves along the guide assembly toward one side of the fulcrum during the rotation process until it moves to the connection point of the two guide rails.

[0013] Furthermore, the driving pusher assembly includes a rotatable connecting disk, a telescopic rod for length compensation is fixed on the surface of the connecting disk, a movable rod of the telescopic rod is connected to a walking wheel that travels on the inside of the guide assembly, and a pusher part is installed at the end of the movable rod.

[0014] Further, the pusher portion includes a mounting strip, the mounting strip is fixed to the end of the movable rod, two symmetrically arranged guide shells are fixed on the mounting strip, a pusher plate is slidably connected inside the guide shell, a spring is fixed on the pusher plate, and both ends of the spring are respectively fixed to the pusher plate and the guide shell;

[0015] Driving rods cooperating with the step-by-step feeding assembly for feeding are fixed at both ends of the installation strip, and a driving plate cooperating with the step-by-step feeding assembly for feeding is arranged between the two guide shells, and the driving plate is fixed on the installation strip.

[0016] Further, the step-by-step feeding assembly includes a fixed sleeve shell, the fixed sleeve shell is fixed to the surface of the guide shell in the feeding shell, the guide shell is a flat arc-shaped structure, the fixed sleeve shell is internally slidably sleeved with a limit slide plate inclined toward the side away from the loading assembly, the limit slide plate penetrates the top side wall of the guide shell and extends into the inner cavity of the guide shell, a spring is fixed on the surface of the limit slide plate, the two ends of the spring are respectively fixed to the limit slide plate and the fixed sleeve shell, the spring makes the limit slide plate be at the top of the inner cavity of the guide shell when not subjected to external force, and does not hinder the movement of the workpiece to be measured under the action of gravity;

[0017] A first transmission rod, one end of which is rotatably connected to the top of the limiting slide plate, a transmission sleeve is fixedly engaged in the middle of the first transmission rod, the transmission sleeve is rotatably sleeved on the surface of a cylindrical connecting shaft, the connecting shaft is fixed to the surface of the guide shell through a connecting rod at its end, and the first transmission rod can overlap the driving plate;

[0018] On one side of the bottom of the fixed housing near the loading component, a material blocking plate is provided. The material blocking plate is rotatably connected to the inner wall of a through groove on the bottom side wall of the material guiding housing. A torsion spring is provided at the connection between the material blocking plate and the material guiding housing. On both end faces of the material blocking plate, a second transmission rod is fixed. The second transmission rod passes through the side wall of the material guiding housing through a guiding through groove with an arc-shaped structure and extends to the outside of the material guiding housing. The second transmission rod can be lapped with the driving rod.

[0019] Further, the feeding housing includes a feeding hopper which is located outside the housing. The bottom of the feeding hopper is connected to the material guiding housing. The material guiding housing penetrates the side wall of the housing. The bottom of the material guiding housing is connected to the material transporting housing. The material transporting housing is arranged horizontally.

[0020] The top of the connection between the material transporting housing and the material guiding housing is open, and a passing through groove for the movement of the material pushing part is provided in the middle of the top of the material transporting housing.

[0021] On the bottom side wall of the end of the material transporting housing, an inclined material guiding plate is fixed. The material guiding plate extends to one side of the top of the placing fulcrum. On the other side of the placing fulcrum, a blocking inclined plate symmetrically arranged with the material guiding plate is fixed. The blocking inclined plate and the material guiding plate form a "V"-shaped structure.

[0022] Further, on the top side wall of the inner cavity of the material transporting housing, two rows of alignment rods are rotatably connected. The two rows of alignment rods are respectively located on both sides of the passing through groove and are symmetrically arranged with each other. One end of a torsion spring is fixed on the surface of the alignment rod, and the torsion spring is also fixed on the inner wall of the material transporting housing.

[0023] Further, the loading component includes a fixing frame which is fixed in the inner cavity of the housing. A loading unit is installed on the fixing frame. A loading rod which can move vertically is installed at the output end of the loading unit. The bottom of the loading rod is connected to a loading part through a switching component which can switch different loading parts.

[0024] Further, the switching component includes a rotatable bearing disc. Two or more placing cavities are provided on the surface of the bearing disc. The placing cavities penetrate the bearing disc. Different loading parts with different-shaped loading ends are placed inside different placing cavities. The loading part includes a fixing column and a loading end fixed at the bottom of the fixing column. An insertion cavity for the loading rod to enter and exit is provided at the top of the fixing column. The bottom of the insertion cavity is communicated with an installation cavity. A self-fixing part which can be connected to the end of the loading rod is arranged in the installation cavity.

[0025] The outer center part of the fixing column protrudes outward to form an annular spherical protrusion. Limiting sleeves are arranged on both sides of the bottom of the fixing column. The limiting sleeves are connected to the inner wall of the placement cavity through a connecting rod with a spring and telescopic function. The connecting rod is endowed with the ability of length compensation through the spring. The elastic force of the spring is used to push the two limiting sleeves to clamp the fixing column. The two limiting sleeves can overlap with the spherical protrusion. The top and bottom of the limiting sleeve are both inclined structures, which is convenient for the fixing column to enter and exit, and the cross-section of the limiting sleeve is an arc-shaped structure.

[0026] Further, the self-fixing part includes two placement plates for placing and limiting the end of the loading rod, the placement plates are fixed on the side walls of the installation cavity, a trigger plate is arranged between the two placement plates, a connecting shaft is fixed at the bottom center of the trigger plate, the connecting shaft is slidably connected in the inner cavity of the guide sleeve, the guide sleeve is fixed to the inner wall of the installation cavity through a connecting rod, a transmission plate is fixed at the bottom end of the connecting shaft, and a spring is sleeved on the surface of the connecting shaft;

[0027] Furthermore, driven limit rods are provided on both sides of the transmission plate, and the bottom ends of the two driven limit rods extend toward the bottom side of the transmission plate and are both located at the bottom of the transmission plate. A rotating shaft passes through the middle part of the driven limit rod, and a coil spring is sleeved on the surface of the rotating shaft. The elastic force provided by the coil spring on the surface of the rotating shaft is greater than the elastic force provided by the spring on the surface of the connecting shaft. The rotating shaft is fixed on the inner wall of the mounting cavity, and a limit plate is fixed to one side of the top of the driven limit rod, and the limit plate can overlap with the limit block on the end of the loading rod, and a non-return portion that can release the non-return state is provided on the other side of the top of the driven limit rod.

[0028] On the basis of being in accordance with the common sense in the art, the above-mentioned preferred conditions can be arbitrarily combined to obtain the preferred embodiments of the present invention.

[0029] The positive and progressive effects of the present invention are:

[0030] The driven push assembly and the step-by-step loading assembly can realize automatic loading in the steel bar bending strength test, which is convenient for the detection of batches of steel bars, reduces the labor intensity of operators and improves the test efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic diagram of the external structure of the present invention;

[0032] Figure 2 It is a schematic diagram of the internal structure of the present invention;

[0033] Figure 3 It is a schematic diagram of the structure of the driving pusher assembly of the present invention when it is in a vertical state;

[0034] Figure 4Schematic diagram of the structure of the driving material pushing component of the present invention when it is in an idle state;

[0035] Figure 5 Schematic diagram of the structure of the feeding shell and the step feeding component of the present invention;

[0036] Figure 6 Stereoscopic structure diagram of the driving material pushing component of the present invention;

[0037] Figure 7 Schematic diagram of the structure of the top switching component of the present invention;

[0038] Figure 8 Schematic diagram of the internal structure of the fixed column of the present invention;

[0039] Figure 9 Schematic diagram of one of the different forms of the loading end of the present invention;

[0040] Figure 10 Schematic diagram of the structure of the insertion cavity and the installation cavity of the present invention;

[0041] Figure 11 For the present invention Figure 3 Partial enlarged structure diagram at position A;

[0042] Figure 12 For the present invention Figure 3 Partial enlarged structure diagram at position B;

[0043] Figure 13 For the present invention Figure 5 Partial enlarged structure diagram at position C;

[0044] Figure 14 Schematic diagram of the connection structure between the driven plate and the one-way rotating plate of the present invention.

[0045] Explanation of reference numerals

[0046] 1. Workbench; 11. Outer shell; 12. Mounting frame;

[0047] 2. Feeding shell; 21. Feeding hopper; 22. Guide shell; 23. Material transporting shell; 231. Alignment rod; 232. Guide plate;

[0048] 3. Step feeding component; 31. Fixed sleeve shell; 32. Limit sliding plate; 33. First transmission rod; 34. Transmission sleeve; 35. Connecting round shaft; 36. Material blocking plate; 37. Second transmission rod; 38. Guide through groove;

[0049] 4. Guide component; 41. Limit guide rail; 42. Transition guide rail; 43. Guide guide rail;

[0050] 5. Loading component; 51. Fixed frame; 52. Loading unit; 53. Loading rod; 531. Limit block; 54. Placing fulcrum;

[0051] 6. Switching component; 61. Carrying plate; 62. Placing cavity; 63. Limiting sleeve; 64. Connecting rod; 65. Trigger rod; 66. Switching motor;

[0052] 7. Loading part; 71. Fixed column; 711. Loading end; 712. Trigger cavity; 72. Insertion cavity; 73. Installation cavity; 74. Placing plate; 75. Trigger plate; 76. Connecting shaft; 761. Guide sleeve; 762. Transmission plate; 77. Driven limit rod; 771. Limit plate; 772. Check ratchet; 78. Check ratchet pawl; 781. Transmission rope; 79. Driven plate; 791. One-way rotating plate;

[0053] 8. Driving and pushing component; 81. Connecting disk; 82. Telescopic rod; 83. Walking wheel; 84. Pushing part; 841. Installation strip plate; 842. Guide shell; 843. Pushing plate; 844. Driving rod; 845. Driving plate; 85. Driving motor. Specific embodiments

[0054] The present invention will be further described below by way of embodiments, but the present invention is not limited to the scope of the embodiments.

[0055] As Figure 1 and Figure 2 shown, a flexural strength testing machine for testing the strength of steel bars includes a workbench 1 and a housing 11 fixed on the top of the workbench 1. A loading component 5 for providing a load is arranged inside the housing 11. The workbench 1 at the bottom of the loading component 5 is of a hollow structure, and an installation frame 12 is arranged at the bottom of the hollow part. The installation frame 12 is fixed on the workbench 1. Two symmetrically arranged placing fulcrums 54 are arranged on the installation frame 12, and the placing fulcrums 54 are used for placing the steel bars to be tested;

[0056] The driving and pushing component 8 is arranged inside the housing 11 and is located on one side of the loading component 5. A feeding housing 2 is arranged on the other side of the driving and pushing component 8;

[0057] A stepping feeding component 3 is arranged on the feeding housing 2. The driving and pushing component 8 pushes the workpiece to be tested inside the feeding housing 2 onto the placing fulcrum 54, and the stepping feeding component 3 releases one workpiece to be tested at a time under the drive of the driving and pushing component 8.

[0058] Put the steel bars to be tested into the feeding shell 2 at one time, and then drive the pushing component 8 to drive the step feeding component 3 to operate, and push the steel bar segments to be tested in the feeding shell 2 onto the placing fulcrum 54 one by one, realizing automatic feeding in the bending strength test of steel bars, facilitating the detection of batches of steel bars, reducing the labor intensity of operators, and improving the test efficiency at the same time.

[0059] At the same time, the operation safety is also improved.

[0060] Embodiment 1

[0061] As one of the embodiments of the present application, as Figure 6 shown, a guiding component 4 is arranged around the driving pushing component 8, the guiding component 4 is fixed on the inner wall of the outer shell 11 through a connecting rod, the guiding component 4 includes an arc-shaped limiting guide rail 41, both ends of the limiting guide rail 41 are connected with transition guide rails 42, and the transition guide rails 42 guide the driving pushing component 8 to move towards the side of the loading component 5 to realize feeding. The two transition guide rails 42 are connected by two symmetrically arranged guiding guide rails 43. A closed loop is formed between the limiting guide rail 41, the transition guide rails 42 and the guiding guide rails 43, that is, the pushing part 84 moves on the closed-loop guide rail formed by the limiting guide rail 41, the transition guide rails 42 and the guiding guide rails 43, so as to change the position and realize pushing. The transition guide rails 42 and the guiding guide rails 43 are both arc-shaped structures and extend towards the placing fulcrum 54.

[0062] Furthermore, the pushing part 84 on the driving pushing component 8 moves towards the side of the placing fulcrum 54 along the guiding component 4 during the rotation until it moves to the connection point of the two guiding guide rails 43. At this time, the pushing part 84 is closest to the placing fulcrum 54, and the workpiece to be tested is pushed to the placing fulcrum 54.

[0063] The driving pushing component 8 includes a rotatable connection disk 81, a telescopic rod 82 capable of length compensation is fixed on the surface of the connection disk 81, the length compensation of the telescopic rod 82 is realized by the elastic force of a spring, that is, a spring is sleeved on the surface of the telescopic rod 82. The connection disk 81 is fixed on the output end of a driving motor 85, and the driving motor 85 is fixed on the inner cavity side wall of the outer shell 11. A walking wheel 83 walking inside the guiding component 4 is connected to the movable rod of the telescopic rod 82, and a pushing part 84 is installed at the end of the movable rod.

[0064] In this embodiment, the driving motor 85 drives the connection disk 81 to rotate, and the rotating connection disk 81 drives the telescopic rod 82 to rotate counterclockwise. During the rotation of the telescopic rod 82, the walking wheel 83 on its movable end always walks on the guiding component 4 under the action of the elastic force of the spring, that is, the movement of the pushing part 84 on the movable end of the telescopic rod 82 is controlled.

[0065] Embodiment 2

[0066] This embodiment is obtained based on Embodiment 1. As Figure 6 shown, the material pushing part 84 includes a mounting strip plate 841, the mounting strip plate 841 is fixed at the end of the movable rod, two symmetrically arranged guide shells 842 are fixed on the mounting strip plate 841, a material pushing plate 843 is slidably connected inside the guide shell 842, a spring is fixed on the material pushing plate 843, and both ends of the spring are respectively fixed on the material pushing plate 843 and the guide shell 842. When the material pushing plate 843 is not affected by an external force, the spring causes the material pushing plate 843 to completely extend out of the guide shell 842;

[0067] Driving rods 844 for cooperating with the step feeding assembly 3 for feeding are fixed at both ends of the mounting strip plate 841, and a driving plate 845 for cooperating with the step feeding assembly 3 for feeding is arranged between the two guide shells 842, and the driving plate 845 is fixed on the mounting strip plate 841.

[0068] The driving rods 844 and the driving plate 845 move along with the mounting strip plate 841 to trigger the step feeding assembly 3.

[0069] Embodiment 3

[0070] This embodiment is obtained based on Embodiment 1 and Embodiment 2. As Figure 5 and Figure 13 shown, the step feeding assembly 3 includes a fixed sleeve 31, the fixed sleeve 31 is fixed on the surface of the guide shell 22 in the feeding shell 2. The guide shell 22 is a flat arc-shaped structure, which is convenient for the workpiece to be measured to move to the front of the material blocking plate 36 under the action of gravity. A limiting slide plate 32 inclined away from the loading assembly 5 is slidably sleeved inside the fixed sleeve 31. The limiting slide plate 32 penetrates through the top side wall of the guide shell 22 and extends into the inner cavity of the guide shell 22. A spring is fixed on the surface of the limiting slide plate 32, and both ends of the spring are respectively fixed on the limiting slide plate 32 and the fixed sleeve 31. When the limiting slide plate 32 is not affected by an external force, it is located at the top of the inner cavity of the guide shell 22 and does not hinder the movement of the workpiece to be measured under the action of gravity. By moving the limiting slide plate 32 to push the workpiece to be measured in the direction away from the loading assembly 5, the limitation of other workpieces to be measured is realized;

[0071] Further, for the first transmission rod 33, one end of the first transmission rod 33 is rotatably connected to the top of the limit sliding plate 32. A transmission sleeve 34 is fitted and fixed to the middle part of the first transmission rod 33. The transmission sleeve 34 is rotatably sleeved on the surface of a cylindrical connecting circular shaft 35. The connecting circular shaft 35 is fixed to the surface of the material guiding shell 22 through a connecting rod at its end. The first transmission rod 33 can be lapped with the driving plate 845. The driving plate 845 is arranged perpendicular to the mounting strip plate 841. By the moving driving plate 845 pushing the first transmission rod 33 to rotate around the connecting shaft 76, the limit sliding plate 32 is driven to push the workpiece to be measured to move in a direction away from the loading assembly 5, so as to realize the feeding of the workpiece to be measured one by one.

[0072] Specifically, a material blocking plate 36 is arranged on one side of the bottom of the fixed sleeve shell 31 close to the loading assembly 5. The material blocking plate 36 is rotatably connected to the inner wall of a through groove on the bottom side wall of the material guiding shell 22. A torsion spring is arranged at the connection between the material blocking plate 36 and the material guiding shell 22. By the torsion spring, the material blocking plate 36 is in a lifted state when not subjected to external forces other than the workpiece to be measured, that is, it plays a role in blocking the workpiece to be measured. Second transmission rods 37 are fixed to both side end faces of the material blocking plate 36. The second transmission rods 37 pass through the side wall of the material guiding shell 22 through arc-shaped guiding through grooves 38 and extend to the outside of the material guiding shell 22. The second transmission rods 37 can be lapped with the driving rods 844.

[0073] In this embodiment, when the pushing part 84 moves to the position of the first transmission rod 33, the end of the driving plate 845 in the pushing part 84 pushes the first transmission rod 33 to rotate around the connecting circular shaft 35, so as to drive the limit sliding plate 32 to push other workpieces to be measured to move in a direction away from the loading assembly 5, so that the workpiece to be measured closest to the loading assembly 5 is located at the material blocking plate 36. When the driving plate 845 pushes the first transmission rod 33 to the limit position of the rotation angle, the end of the driving plate 845 is separated from the first transmission rod 33. At this time, the first transmission rod 33 is lapped with the side face of the driving plate 845, and the first transmission rod 33 is in a relatively static state, that is, the limit sliding plate 32 maintains the state of pushing other workpieces to be measured away.

[0074] During the continuous movement of the pushing part 84, the driving rod 844 starts to be lapped with the second transmission rod 37. The moving driving rod 844 drives the driving rod 844 to move in a circular arc trajectory, driving the material blocking plate 36 to move horizontally until the material blocking plate 36 is in a horizontal state. At this time, the only workpiece to be measured blocked by the material blocking plate 36 rolls to the connection between the material transporting shell 23 and the material guiding shell 22. After the driving rod 844 is separated from the second transmission rod 37, the driving plate 845 is separated from the first transmission rod 33. At this time, the material blocking plate 36 and the limit sliding plate 32 return to their original states successively for the next feeding.

[0075] The gap between the bottom of the material blocking plate 36 and the limiting sliding plate 32 is greater than the diameter of a workpiece to be measured and less than twice the diameter of the workpiece.

[0076] Embodiment 4

[0077] This embodiment is obtained on the basis of Embodiment 1, Embodiment 2, and Embodiment 3. As Figure 5 and 13 shown, the feeding housing 2 includes a feeding hopper 21. The workpiece to be measured is placed into the feeding hopper 21. The feeding hopper 21 is located outside the outer housing 11. The bottom of the feeding hopper 21 is connected to the material guiding housing 22. The material guiding housing 22 penetrates through the side wall of the outer housing 11. The bottom of the material guiding housing 22 is connected to the material transporting housing 23. The material transporting housing 23 is arranged horizontally.

[0078] The top of the connection between the material transporting housing 23 and the material guiding housing 22 is open, and a passing through slot for the movement of the material pushing part 84 is provided in the middle of the top of the material transporting housing 23. The passing through slot and the through slot at the connection of the material transporting housing 23 and the material guiding housing 22 form a "T" - shaped structure.

[0079] An inclined material guiding plate 232 is fixed on the bottom side wall at the end of the material transporting housing 23. The material guiding plate 232 extends to one side of the top of the placing fulcrum 54. A blocking inclined plate symmetrically arranged with the material guiding plate 232 is fixed on the other side of the placing fulcrum 54. The blocking inclined plate and the material guiding plate 232 form a "V" - shaped structure.

[0080] In this embodiment, as Figure 3 shown, after passing through the step - by - step feeding assembly 3, the material pushing part 84 continues to rotate and move. The material pushing part 84 rotates to the connection of the material transporting housing 23 and the material guiding housing 22 and then extends into the inner cavity of the material transporting housing 23. The continuously moving material pushing part 84 pushes the workpiece to be measured to move in the inner cavity of the material transporting housing 23 until the workpiece to be measured moves to the material guiding plate 232. At this time, the workpiece to be measured falls onto the two placing fulcrums 54 under the guidance of the material guiding plate 232, realizing feeding.

[0081] And the material pushing part 84 makes the next cyclic movement under the guidance of the guiding assembly 4.

[0082] Preferably, two rows of alignment rods 231 are rotatably connected to the top side wall of the inner cavity of the material transporting housing 23. The two rows of alignment rods 231 are respectively located on both sides of the passing through slot and are symmetrically arranged with each other. One end of a coil spring is fixed on the surface of the alignment rod 231, and the coil spring is also fixed on the inner wall of the material transporting housing 23.

[0083] The alignment rod 231 is in the vertical direction through the corresponding coil spring. When the workpiece to be measured is pushed into the inner cavity of the material transporting shell 23, the symmetrically arranged alignment rods 231 in pairs will hinder the movement of the workpiece to be measured. When the workpiece to be measured is in an inclined position, the workpiece to be measured will be pressed on the pushing plate 843 by the two paired alignment rods 231, making the workpiece to be measured parallel to the pushing plate 843, that is, after the workpiece to be measured exits the material transporting shell 23, it is parallel to the connection line of the two placing supports 54, which is convenient for the workpiece to be measured to fall between the two placing supports 54 and is beneficial to subsequent detection.

[0084] Embodiment Five

[0085] As another embodiment in the present application, as Figure 2 and Figure 7 shown, the loading assembly 5 includes a fixing frame 51, the fixing frame 51 is fixed in the inner cavity of the outer shell 11, a loading unit 52 is installed on the fixing frame 51, a vertically movable loading rod 53 is installed at the output end of the loading unit 52, and the bottom of the loading rod 53 is connected to the loading part 7 through a switching assembly 6 that can switch different loading parts 7.

[0086] The loading unit 52 is one of an electric push rod, a hydraulic push rod or a pneumatic push rod.

[0087] The loading unit 52 drives the loading rod 53 to move downward. During the downward movement, the loading rod 53 is connected to the selected loading part 7 and then presses the workpiece to be measured, realizing the bending strength test of the workpiece to be measured.

[0088] Further, the switching assembly 6 includes a rotatable bearing disc 61. Two or more placing cavities 62 are formed on the surface of the bearing disc 61. The placing cavities 62 on the bearing disc 61 are distributed in a circular array. The placing cavities 62 penetrate through the bearing disc 61. Different placing cavities 62 are internally provided with loading parts 7 with different-shaped loading ends 711. The loading part 7 includes a fixing column 71 and a loading end 711 fixed at the bottom of the fixing column 71. An insertion cavity 72 for the loading rod 53 to enter and exit is formed at the top of the fixing column 71. The bottom of the insertion cavity 72 is communicated with an installation cavity 73, and a self-fixing part that can be connected to the end of the loading rod 53 is arranged in the installation cavity 73.

[0089] In this embodiment, during the rotation of the bearing disc 61, different placing cavities 62 will sequentially pass under the loading rod 53 to select the loading parts 7 with different loading ends 711.

[0090] The outer center part of the fixing column 71 protrudes outward to form an annular spherical protrusion. Limiting sleeves 63 are arranged on both sides of the bottom of the fixing column 71. The limiting sleeves 63 are connected to the inner wall of the placement cavity 62 through a connecting rod 64 with a spring and telescopic function. The connecting rod 64 is enabled to have the ability of length compensation through the spring. The elastic force of the spring is used to push the two limiting sleeves 63 to clamp the fixing column 71. The two limiting sleeves 63 can overlap with the spherical protrusion. The top and bottom of the limiting sleeves 63 are both inclined structures. The loading part 7 is fixed by clamping the two limiting sleeves 63.

[0091] The carrier plate 61 is mounted on the fixing frame 51. The output end of the switching motor 66 is fixed at the top center of the carrier plate 61. The switching motor 66 is mounted on the fixing frame 51. The switching motor 66 drives the carrier plate 61 to rotate. The switching motor 66 is selected as a stepping motor or a servo motor.

[0092] The self-fixing part includes two placement plates 74 for placing and limiting the end of the loading rod 53, the placement plates 74 are fixed on the side walls of the installation cavity 73, a trigger plate 75 is arranged between the two placement plates 74, a connecting shaft 76 is fixed at the bottom center of the trigger plate 75, the connecting shaft 76 is slidably connected in the inner cavity of the guide sleeve 761, the guide sleeve 761 is fixed on the inner wall of the installation cavity 73 through a connecting rod, a transmission plate 762 is fixed at the bottom end of the connecting shaft 76, a spring is sleeved on the surface of the connecting shaft 76, and the spring makes the trigger plate 75 higher than the placement plate 74 when it is not subjected to other external forces;

[0093] The locking cam 77 is secured on both sides of the cam 73 by a spring which is fixed to the locking cam 73a at the bottom of the cam 73b, and is secured to the locking cam 73b at the bottom of the cam 73b.

[0094] In this embodiment, during the downward movement of the loading rod 53, the bottom of the loading rod 53 first contacts the trigger plate 75, and then drives the trigger plate 75 to move downward. During the downward movement of the trigger plate 75, the transmission plate 762 is driven to move downward through the connecting shaft 76. During the downward movement of the transmission plate 762, the two driven limiting rods 77 are pushed to rotate towards one side of the loading rod 53. During the rotation of the driven limiting rods 77, they cross the check portion until the limiting plate 771 on the driven limiting rod 77 overlaps with the limiting block 531. At this time, the bottom of the loading rod 53 overlaps on the placement plate 74, and the check portion restricts the rotation of the driven limiting rod 77. At this time, a fixed connection in a self-locking state is formed between the loading rod 53 and the loading portion 7.

[0095] During the process of forming a self-locking state between the loading rod 53 and the loading portion 7, due to the elastic force provided by the spring on the surface of the connecting rod 64, its length remains unchanged. The spherical convex portion on the surface of the fixed column 71 is located at the top of the two limiting sleeve shells 63, that is, the fixed column 71 is clamped between the two limiting sleeve shells 63. When a self-locking state is formed between the loading rod 53 and the loading portion 7, the loading rod 53 continues to move downward, pushing the entire loading portion 7 to move downward.

[0096] Embodiment Six

[0097] This embodiment is obtained on the basis of Embodiment Five, as Figure 8 shown, the check portion includes a check pawl 78. The check pawl 78 is rotatably connected to the side wall of the installation cavity 73. The end of the check pawl 78 can abut against the check ratchet teeth 772 on the surface of the driven limiting rod 77. A torsion spring is provided at the connection between the check pawl 78 and the inner wall of the installation cavity 73. Through the torsion spring, the normal tendency of the check ratchet teeth 772 is to be inclined and can abut against the check ratchet teeth 772, that is, when the entire loading portion 7 is in an idle state, the driven limiting rod 77 is inclined towards the side away from the insertion cavity 72 due to the corresponding torsion spring. At this time, the elastic force tendency provided by the torsion spring corresponding to the driven limiting rod 77 is greater than the elastic force tendency provided by the torsion spring corresponding to the check ratchet teeth 772. At this time, the driven limiting rod 77 presses the check ratchet teeth 772 against the side wall of the installation cavity 73 or near the side wall;

[0098] A transmission rope 781, one end of the transmission rope 781 is connected to the check pawl 78, the other end of the transmission rope 781 penetrates through the side wall of the installation cavity 73 and is connected to the top of the driven plate 79. The middle part of the driven plate 79 is rotatably connected to the inner wall of the trigger cavity 712. The trigger cavity 712 is opened on the surface of the spherical convex portion, and the top and bottom of the trigger cavity 712 are both inclined surface structures inclined towards the surface of the spherical convex portion, facilitating the trigger rod 65 to enter and exit the trigger cavity 712;

[0099] The trigger rod 65 corresponding to the driven plate 79 is fixed on the inner wall of the placement cavity 62. The trigger rod 65 is telescopic and has a spring fixed on its surface. The end of the trigger rod 65 can extend into the trigger cavity 712 to overlap with the driven plate 79. The spring enables the trigger rod 65 to have a length compensation function, facilitating the trigger rod 65 to extend into and leave the trigger cavity 712.

[0100] The driven plate 79 is inclined towards the central side of the fixed column 71, and a torsion spring is arranged at the connection between the driven plate 79 and the trigger cavity 712. The torsion spring keeps the driven plate 79 in an inclined state when no external force is applied.

[0101] As Figure 14 shown, the bottom of the driven plate 79 is composed of a one-way rotating plate 791 rotatably connected thereto. A check plate is fixed on the lower surface of the one-way rotating plate 791, and the check plate can overlap with the surface of the driven plate 79.

[0102] After the test is completed, if the loading part 7 does not need to be replaced, the loading part 7 is directly lifted, and the loading part 7 does not enter the placement cavity 62. If the loading part 7 needs to be replaced, after the loading part 7 is lifted and passes through the placement cavity 62, the bearing disc 61 is rotated to make the corresponding placement cavity 62 rotate to the bottom of the loading rod 53.

[0103] In this embodiment, after the loading rod 53 drives the loading part 7 to enter the placement cavity 62 from the bottom of the placement cavity 62, the fixed column 71 first squeezes open the two limiting sleeve shells 63 and then continues to move upward. When the trigger cavity 712 on the surface of the fixed column 71 passes by the trigger rod 65, the trigger rod 65 first shortens and then elongates and then enters the trigger cavity 712. When the fixed column 71 continues to move upward, after the trigger rod 65 passes through the connection between the driven plate 79 and the trigger cavity 712, it pushes the driven plate 79 to rotate towards the side away from the installation cavity 73. During the rotation of the driven plate 79, the transmission rope 781 is pulled, thereby driving the check pawl 78 at the other end of the transmission rope 781 to rotate. The check pawl 78 disengages from the check ratchet teeth 772. At this time, the check state of the check part is released. The driven limit rod 77 has a tendency and ability to rotate outward under the action of the corresponding torsion spring. Under the action of the torsion spring corresponding to the driven limit rod 77, the driven limit rod 77 rotates towards the side away from the installation cavity 73, and the self-locking between the limit block 531 and the limit plate 771 is released. During the continuous upward movement of the loading rod 53, it disengages from the fixed column 71.

[0104] The structures of the springs and torsion springs in this application are existing structures in the prior art, and the installation methods are also the same as those in the prior art. Their shape dimensions and elastic forces can be selected according to the requirements in this application document. All springs and torsion springs are not shown in the figure.

[0105] The workpiece to be measured is a steel bar. To ensure that the loading part is at the middle of the steel bar, two push plates can be arranged on both sides of the placement bracket, that is, on both sides along the length direction of the steel bar. The two push plates are respectively connected to two symmetrically arranged electric push rods. The push plates are driven to move by the simultaneous elongation of the two electric push rods, and the position of the steel bar is calibrated by using the push plates. The loading rod 53 is in the symmetry plane of the electric push rod, and the electric push rod can be fixed on the workbench or the mounting frame.

[0106] Due to the arrangement of the above structure and the structures of all components being prior art, they are not shown in the figure.

[0107] The present invention is not limited to the above embodiments. No matter what changes are made in its shape or structure, they all fall within the protection scope of the present invention. The protection scope of the present invention is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principle and essence of the present invention, but these changes and modifications all fall within the protection scope of the present invention.

Claims

1. A flexural strength testing machine for testing the strength of steel bars, comprising a workbench (1) and a housing (11) fixed on the top of the workbench (1). An loading component (5) for providing a load is arranged inside the housing (11). The workbench (1) at the bottom of the loading component (5) is of a hollow structure, and an installation frame (12) is arranged at the bottom of the hollow part. Two symmetrically arranged placing fulcrums (54) are arranged on the installation frame (12). It is characterized in that: A driving material pushing component (8), the driving material pushing component (8) is arranged inside the housing (11) and on one side of the loading component (5), and a feeding housing (2) is arranged on the other side of the driving material pushing component (8); A stepping feeding component (3), the stepping feeding component (3) is arranged on the feeding housing (2). The driving material pushing component (8) pushes the workpiece to be tested inside the feeding housing (2) onto the placing fulcrum (54), and the stepping feeding component (3) releases one workpiece to be tested at a time under the transmission of the driving material pushing component (8); A guiding component (4) is arranged around the driving material pushing component (8); The driving material pushing component (8) includes a rotatable connecting disk (81). A telescopic rod (82) capable of length compensation is fixed on the surface of the connecting disk (81). A walking wheel (83) walking inside the guiding component (4) is connected to the movable rod of the telescopic rod (82), and a material pushing part (84) is installed at the end of the movable rod; The material pushing part (84) includes an installation strip plate (841), the installation strip plate (841) is fixed at the end of the movable rod, two symmetrically arranged guiding shells (842) are fixed on the installation strip plate (841), a material pushing plate (843) is slidably connected inside the guiding shell (842), and a spring is fixed on the material pushing plate (843). The two ends of the spring are respectively fixed on the material pushing plate (843) and the guiding shell (842); Driving rods (844) cooperating with the stepping feeding component (3) for feeding are fixed at both ends of the installation strip plate (841), and a driving plate (845) cooperating with the stepping feeding component (3) for feeding is arranged between the two guiding shells (842). The driving plate (845) is fixed on the installation strip plate (841); The stepping feeding component (3) includes a fixed sleeve housing (31). The fixed sleeve housing (31) is fixed on the surface of a guiding material housing (22) in the feeding housing (2). The guiding material housing (22) is a flat arc-shaped structure. A limiting sliding plate (32) inclined towards the side away from the loading component (5) is slidably sleeved inside the fixed sleeve housing (31). The limiting sliding plate (32) penetrates through the top side wall of the guiding material housing (22) and extends into the inner cavity of the guiding material housing (22). A spring is fixed on the surface of the limiting sliding plate (32). The two ends of the spring are respectively fixed on the limiting sliding plate (32) and the fixed sleeve housing (31). The spring makes the limiting sliding plate (32) be at the top of the inner cavity of the guiding material housing (22) when not subjected to external force, and does not hinder the movement of the workpiece to be tested under the action of gravity; The first transmission rod (33), one end of the first transmission rod (33) is rotatably connected to the top of the limit slide plate (32), a transmission sleeve (34) is fitted and fixed to the middle part of the first transmission rod (33), the transmission sleeve (34) is rotatably sleeved on the surface of the cylindrical connecting round shaft (35), the connecting round shaft (35) is fixed to the surface of the material guiding shell (22) through a connecting rod at its end, and the first transmission rod (33) can be lapped with the driving plate (845); On one side of the bottom of the fixed sleeve shell (31) close to the loading assembly (5), there is a material blocking plate (36), the material blocking plate (36) is rotatably connected to the inner wall of the through groove on the bottom side wall of the material guiding shell (22), a coil spring is arranged at the connection between the material blocking plate (36) and the material guiding shell (22), second transmission rods (37) are fixed to both side end faces of the material blocking plate (36), the second transmission rods (37) pass through the side wall of the material guiding shell (22) and extend to the outside of the material guiding shell (22) through the arc-shaped guiding through groove (38), and the second transmission rods (37) can be lapped with the driving rod (844).

2. The flexural strength testing machine for testing the strength of steel bars according to claim 1, characterized in that: The guiding assembly (4) includes an arc-shaped limit guide rail (41), both ends of the limit guide rail (41) are connected with transition guide rails (42), the two transition guide rails (42) are connected by two symmetrically arranged guiding guide rails (43), a closed loop is formed among the limit guide rail (41), the transition guide rails (42) and the guiding guide rails (43), and the transition guide rails (42) and the guiding guide rails (43) are both arc-shaped structures and extend towards the placing fulcrum (54); During the rotation of the pushing part (84) on the driving and pushing material assembly (8), it moves along the guiding assembly (4) towards the side of the placing fulcrum (54) until it moves to the connection of the two guiding guide rails (43).

3. The flexural strength testing machine for testing the strength of steel bars according to claim 1, characterized in that: The feeding shell (2) includes a feeding hopper (21), the feeding hopper (21) is located outside the outer shell (11), the bottom of the feeding hopper (21) is connected with the material guiding shell (22), the material guiding shell (22) penetrates the side wall of the outer shell (11), the bottom of the material guiding shell (22) is connected with the material transporting shell (23), and the material transporting shell (23) is arranged horizontally; The top of the connection between the material transporting shell (23) and the material guiding shell (22) is open, and a passing through groove for the movement of the pushing part (84) is opened at the middle part of the top of the material transporting shell (23); An inclined material guiding plate (232) is fixed to the bottom side wall at the end of the material transporting shell (23), the material guiding plate (232) extends to the top side of the placing fulcrum (54), a blocking inclined plate symmetrically arranged with the material guiding plate (232) is fixed to the other side of the placing fulcrum (54), and the blocking inclined plate and the material guiding plate (232) form a "V" - shaped structure.

4. The flexural strength testing machine for testing the strength of steel bars according to claim 3, characterized in that: Two rows of alignment rods (231) are rotatably connected to the top side wall of the inner cavity of the material transporting shell (23), the two rows of alignment rods (231) are respectively located on both sides of the passing through groove and are symmetrically arranged, and one end of a coil spring is fixed to the surface of the alignment rod (231), and the coil spring is also fixed to the inner wall of the material transporting shell (23).

5. The flexural strength testing machine for testing the strength of steel bars according to claim 1, characterized in that: The loading component (5) includes a fixing frame (51), the fixing frame (51) is fixed in the inner cavity of the housing (11), a loading unit (52) is installed on the fixing frame (51), a vertically movable loading rod (53) is installed at the output end of the loading unit (52), and the bottom of the loading rod (53) is connected to the loading part (7) through a switching component (6) that can switch different loading parts (7).

6. The flexural strength testing machine for testing the strength of steel bars according to claim 5, characterized in that: The switching component (6) includes a rotatable bearing disc (61), two or more placing cavities (62) are formed on the surface of the bearing disc (61), the placing cavities (62) penetrate through the bearing disc (61), and loading parts (7) with different-shaped loading ends (711) are placed inside different placing cavities (62). The loading part (7) includes a fixing column (71) and a loading end (711) fixed at the bottom of the fixing column (71). An insertion cavity (72) for the loading rod (53) to enter and exit is formed at the top of the fixing column (71), and the bottom of the insertion cavity (72) is communicated with an installation cavity (73). A self-fixing part that can be connected to the end of the loading rod (53) is arranged in the installation cavity (73). A ring-shaped spherical convex part protrudes outward at the outer central part of the fixing column (71). Limiting sleeve shells (63) are arranged on both sides of the bottom of the fixing column (71). The limiting sleeve shells (63) are connected to the inner wall of the placing cavity (62) through connecting rods (64) with spring and telescopic functions. The connecting rods (64) have the ability to compensate for length through the spring. The fixing column (71) is clamped by the elastic force of the spring to push the two limiting sleeve shells (63). The two limiting sleeve shells (63) can overlap with the spherical convex part. The top and bottom of the limiting sleeve shell (63) are both inclined plane structures to facilitate the entry and exit of the fixing column (71), and the cross section of the limiting sleeve shell (63) is an arc-shaped structure.

7. The flexural strength testing machine for testing the strength of steel bars according to claim 6, characterized in that: The self-fixing part includes two placing plates (74) for placing and limiting the end of the loading rod (53). The placing plates (74) are fixed on the side wall of the installation cavity (73). A trigger plate (75) is arranged between the two placing plates (74). A connecting shaft (76) is fixed at the center of the bottom of the trigger plate (75). The connecting shaft (76) is slidably connected to the inner cavity of a guiding sleeve (761). The guiding sleeve (761) is fixed to the inner wall of the installation cavity (73) through a connecting rod. A transmission plate (762) is fixed at the bottom end of the connecting shaft (76). A spring is sleeved on the surface of the connecting shaft (76). On both sides of the transmission plate (762), driven limit rods (77) are provided. The bottom ends of the two driven limit rods (77) extend towards one side of the bottom of the transmission plate (762) and are both located at the bottom of the transmission plate (762). A rotating shaft penetrates through the middle part of the driven limit rod (77). A torsion spring is sleeved on the surface of the rotating shaft. The elastic force provided by the torsion spring on the surface of the rotating shaft is greater than the elastic force provided by the spring on the surface of the connecting shaft (76). The rotating shaft is fixed on the inner wall of the installation cavity (73). A limit plate (771) is fixed on one side of the top of the driven limit rod (77). The limit plate (771) can be lapped with a limit block (531) at the end of the loading rod (53). A check portion for releasing the check state is provided on the other side of the top of the driven limit rod (77).

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