Spring flat steel hardness testing device and testing method

Abstract

The invention relates to the technical field of spring flat steel hardness testing, and discloses a spring flat steel hardness testing device and method.The spring flat steel hardness testing device comprises a machine body, a hydraulic cylinder is fixedly installed at the top of the machine body, and a testing head is fixedly installed at the piston end of the hydraulic cylinder; the machine body is provided with a positioning mechanism for improving the stability of the spring flat steel, a protection mechanism, a protection mechanism for protecting the testing head, and a cleaning mechanism. The spring flat steel is fixed in all directions through the positioning mechanism, so that the spring flat steel can be kept in a stable state in the hardness testing process, the situation that testing data is affected due to displacement caused by deformation of the spring flat steel in the hardness testing process is avoided, and then the accuracy of the hardness testing numerical value of the spring flat steel can be guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of spring flat steel hardness testing, in particular to a spring flat steel hardness testing device and a testing method. Background Art

[0002] Hardness is the ability of a material to resist local plastic deformation and is one of the important indicators for measuring the performance of spring steel. The hardness of spring flat steel is directly related to its wear resistance, fatigue resistance and service life.

[0003] At present, the commonly used hardness test methods for spring flat steel include Brinell hardness test (HB), Rockwell hardness test (HR) and Vickers hardness test (HV). Brinell hardness test is suitable for softer materials. By applying a certain pressure, the carbide ball is pressed into the material surface, and then the indentation diameter is measured to calculate the hardness. Rockwell hardness test is suitable for harder materials. Diamond cone or carbide ball head is used to apply pressure on the material surface, and the hardness is calculated according to the indentation depth. Vickers hardness test uses diamond square cone head and is suitable for testing various hardness materials.

[0004] Since the hardness test of spring flat steel mostly adopts the downward pressing method, the spring flat steel is not easy to be displaced. Therefore, most of the common testing devices on the market do not have the function of locating the spring flat steel. However, when encountering some unqualified spring flat steel, the spring flat steel will be deformed during the extrusion test, and then it is easy to be displaced, causing the test point to be offset, affecting the accuracy of the spring flat steel hardness test. Summary of the invention

[0005] The object of the present invention is to provide a spring flat steel hardness testing device and a testing method to solve the problems raised in the above background technology.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a spring flat steel hardness testing device, comprising a body, a hydraulic cylinder is fixedly installed on the top of the body, a test head is fixedly installed on the piston end of the hydraulic cylinder, a positioning mechanism for improving the stability of the spring flat steel is provided on the body, a protective mechanism is provided on the body, a protective mechanism for protecting the test head is provided on the body, and a cleaning mechanism is provided on the body; wherein the positioning mechanism comprises a positioning plate, a side plate, a threaded rod, a positioning rod, a clamping plate, a top plate, a return spring, a sliding shaft, a cross bar, an inclined rod, a rubber pad, a handle, an L-plate and an inclined slide groove; the positioning plate is slidably connected to the side wall of the body, the inner wall of the positioning plate is slidably connected to the positioning rod, and the positioning rod passes through the positioning plate, the bottom of the positioning rod is fixedly installed with a clamping plate, and the positioning rod A top plate is fixedly installed on the top, and a return spring is fixedly installed on the bottom of the top plate, and one end of the return spring is fixedly installed on the top of the positioning plate, and the side wall of the positioning plate is fixedly installed with a sliding shaft, and the side wall of the positioning plate is fixedly installed with a cross bar, and the side plate is slidably connected to the side wall of the top plate, and an inclined rod is fixedly installed on the outer wall of the side plate, and the outer wall of the sliding shaft fits the inner wall of the inclined rod, and the side wall of the side plate and the bottom of the clamping plate are fixedly installed with a rubber pad, one end of the threaded rod is rotatably connected to the inner wall of the machine body, and the other end of the threaded rod passes through the machine body and is fixedly installed with a handle, the threaded rod is rotatably connected to the penetration point of the machine body, and the outer wall of the machine body is slidably connected with an L plate, the L plate is threadedly connected to the threaded rod, and an inclined slot is provided on the L plate, and the outer wall of the cross bar fits the inner wall of the inclined slot.

[0007] Preferably, the protective mechanism includes a rotating rod, a spiral groove, an L rod, a slide plate, a sliding rod, an inclined pressure groove, a baffle cover, and a transverse groove; the rotating rod is rotatably connected to the inner wall of the machine body, and the rotating rod passes through the machine body, a spiral groove is opened on the rotating rod, and an L rod is fixedly installed on the side wall of the rotating rod.

[0008] Preferably, a slide plate is slidably connected to the inner wall of the body, a slide bar is fixedly mounted on the inner wall of the slide plate, and the slide bar passes through the slide plate, an oblique pressure groove is provided at the bottom of the L-plate, the outer wall of the slide bar is fitted to the inner wall of the oblique pressure groove, and the outer wall of the slide bar is fitted to the inner wall of the spiral groove. The slide plate can be provided to provide guidance for the slide bar, and the slide bar can be used in conjunction with the spiral groove to drive the rotating rod to rotate.

[0009] Preferably, the inner wall of the body is slidably connected with a shield, and a transverse groove is provided on the shield. The end of the L-rod away from the rotating rod is fitted onto the inner wall of the transverse groove. When the spring flat steel is broken by the test head during the hardness test and metal debris is splashed everywhere, the shield can block the splashing metal scraps to prevent the metal splashes from accidentally injuring surrounding personnel.

[0010] Preferably, the protection mechanism includes a bent rod, a protective cover, a hollow rod, a slider, a push rod, an oblique through slot and a connecting rod; the bent rod is hinged at the top of the body, one end of the bent rod is fixedly mounted with a protective cover, and the other end of the bent rod is fixedly mounted with a hollow rod, and the test head can be protected by arranging the bent rod in conjunction with the protective cover.

[0011] Preferably, a slider is slidably connected to the top of the body, a push rod is fixedly installed on the outer wall of the slider, the outer wall of the push rod is fitted on the inner wall of the hollow rod, an oblique groove is opened on the baffle cover, a connecting rod is fixedly installed on the side wall of the slider, and one end of the connecting rod away from the slider is fitted on the inner wall of the oblique groove, and the push rod is arranged to cooperate with the hollow rod to drive the bending rod to rotate on the top of the body.

[0012] Preferably, the cleaning mechanism comprises a fixed shaft, a gear, a driving rack, a brush and a driven rack; one end of the fixed shaft is fixedly mounted on the outer wall of the machine body, and the other end of the fixed shaft is rotatably connected to a gear.

[0013] Preferably, a driving rack is fixedly mounted on the outer wall of the L-plate, and the driving rack is meshed with a gear.

[0014] Preferably, a brush is slidably connected to the side wall of the body, a driven rack is fixedly installed on the bottom of the brush, and the driven rack is meshed with the gear. By arranging the brush, impurities on the surface of the spring flat steel can be cleaned.

[0015] A method for testing the hardness of a spring flat steel, using the above-mentioned spring flat steel hardness testing device, comprises the following steps:

[0016] S1. Before use, first place the spring flat steel to be tested for hardness inside the machine body and directly under the test head;

[0017] S2. When the spring flat steel is placed directly below the test head, the hydraulic cylinder is started to drive the test head to move downward, so that the test head contacts the spring flat steel and presses the spring flat steel downward;

[0018] S3. A certain downward pressure is applied by the hydraulic cylinder to press the test head into the surface of the spring flat steel, and then the indentation diameter is measured to calculate the hardness, thereby obtaining the hardness value of the spring flat steel.

[0019] Compared with the prior art, the present invention provides a spring flat steel hardness testing device and testing method, which have the following beneficial effects:

[0020] 1. The spring flat steel hardness testing device and testing method fix the spring flat steel in all directions through the setting of the positioning mechanism, so that the spring flat steel can maintain a stable state during the hardness test, avoiding deformation and displacement of the spring flat steel during the hardness test, which may affect the test data, thereby ensuring the accuracy of the hardness test value of the spring flat steel.

[0021] 2. The spring flat steel hardness testing device and testing method can cover the spring flat steel during the hardness test by setting a protective mechanism, so as to prevent the spring flat steel from being broken by the test head during the hardness test and causing metal debris to splash around and accidentally injure surrounding workers, so that the workers can perform hardness testing in a safe working environment.

[0022] 3. The spring flat steel hardness testing device and testing method can cover the test head when the body is idle through the setting of the protection mechanism, so as to protect the test head and prevent the test head from being damaged by the impact of hard objects, so that the test head can be in a safe environment when the body is idle.

[0023] 4. The spring flat steel hardness testing device and testing method can clean the upper surface of the spring flat steel before the hardness test through the setting of the cleaning mechanism, so as to avoid the impurities on the surface of the spring flat steel affecting the downward pressure applied by the test head to the spring flat steel, thereby further improving the data accuracy of the spring flat steel hardness test. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for the specific embodiments or the description of the prior art. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn according to the actual scale.

[0025] Figure 1 It is a schematic diagram of the overall structure of the front side of the present invention;

[0026] Figure 2 It is a schematic diagram of the overall structure of the back side of the present invention;

[0027] Figure 3 It is a schematic diagram of the structure of the present invention when the baffle cover is raised;

[0028] Figure 4 It is a schematic diagram of the cross-sectional structure of the machine body of the present invention;

[0029] Figure 5 It is a schematic diagram of the overall structure of the positioning plate of the present invention;

[0030] Figure 6It is a schematic diagram of the overall structure of the L-plate and the protection mechanism of the present invention;

[0031] Figure 7 It is a schematic diagram of the overall structure of the shield and the protection mechanism of the present invention;

[0032] Figure 8 It is a schematic diagram of the overall structure of the L plate and the cleaning mechanism of the present invention;

[0033] Fig. 9 For the present invention Figure 2 A is an enlarged structural diagram of FIG.

[0034] In the figure: 1, machine body; 2, hydraulic cylinder; 3, test head; 4, positioning mechanism; 41, positioning plate; 42, side plate; 43, threaded rod; 44, positioning rod; 45, clamping plate; 46, top plate; 47, return spring; 48, sliding shaft; 49, cross bar; 410, inclined rod; 411, rubber pad; 412, handle; 413, L plate; 414, inclined slide; 5, protection mechanism; 51, rotating rod; 5 2. Spiral groove; 53. L rod; 54. Slide plate; 55. Sliding rod; 56. Oblique pressure groove; 57. Block cover; 58. Horizontal groove; 6. Protection mechanism; 61. Bending rod; 62. Protection cover; 63. Hollow rod; 64. Sliding block; 65. Push rod; 66. Oblique through groove; 67. Connecting rod; 7. Cleaning mechanism; 71. Fixed shaft; 72. Gear; 73. Driving rack; 74. Brush; 75. Driven rack. DETAILED DESCRIPTION

[0035] See also Figure 1-Figure 9One embodiment of the present invention is: a spring flat steel hardness testing device, comprising a body 1, a hydraulic cylinder 2 is fixedly installed on the top of the body 1, a test head 3 is fixedly installed on the piston end of the hydraulic cylinder 2, a positioning mechanism 4 for improving the stability of the spring flat steel is provided on the body 1, a protective mechanism 5 is provided on the body 1, a protective mechanism 6 for protecting the test head 3 is provided on the body 1, and a cleaning mechanism 7 is provided on the body 1; wherein the positioning mechanism 4 comprises a positioning plate 41, a side plate 42, a threaded rod 43, a positioning rod 44, a clamping plate 45, a top plate 46, a return spring 47, a sliding shaft 48, cross bar 49, oblique bar 410, rubber pad 411, handle 412, L plate 413 and oblique slide groove 414; the positioning plate 41 is slidably connected to the side wall of the body 1, the inner wall of the positioning plate 41 is slidably connected with a positioning rod 44, and the positioning rod 44 passes through the positioning plate 41, the bottom of the positioning rod 44 is fixedly installed with a clamping plate 45, the top of the positioning rod 44 is fixedly installed with a top plate 46, and the bottom of the top plate 46 is fixedly installed with a return spring 47, and the end of the return spring 47 away from the top plate 46 is fixedly installed on the top of the positioning plate 41, and the positioning plate 41 will slide downward when it slides downward. The return spring 47 and the top plate 46 can drive the positioning rod 44 to move downward synchronously. When the positioning rod 44 moves downward, the clamping plate 45 will move downward synchronously. When the clamping plate 45 contacts the upper surface of the spring flat steel, the clamping plate 45 and the positioning rod 44 will be limited by the spring flat steel, so that the clamping plate 45 and the positioning rod 44 are in a static state. The side wall of the positioning plate 41 is fixedly installed with a sliding shaft 48, and the side wall of the positioning plate 41 is fixedly installed with a cross bar 49. One end of the threaded rod 43 is rotatably connected to the inner wall of the body 1, and the other end of the threaded rod 43 passes through the body 1 and is fixedly installed with a handle Hand 412, the threaded rod 43 is rotatably connected to the penetration point of the body 1, and the outer wall of the body 1 is slidably connected with an L-plate 413, the L-plate 413 is threadedly connected to the threaded rod 43, the threaded rod 43 is rotated by the handle 412, and the L-plate 413 threadedly connected to it is driven to slide on the outer wall of the body 1 by the rotation of the threaded rod 43, and an inclined groove 414 is provided on the L-plate 413, and the outer wall of the cross bar 49 is attached to the inner wall of the inclined groove 414. When the L-plate 413 slides, the inclined groove 414 will squeeze the cross bar 49, so that the cross bar 49 drives the positioning plate 41 to slide on the side wall of the body 1.

[0036] The side plate 42 is slidably connected to the side wall of the top plate 46, and the outer wall of the side plate 42 is fixedly installed with an inclined rod 410, and the outer wall of the sliding shaft 48 is fitted against the inner wall of the inclined rod 410. The positioning plate 41 stretches the reset spring 47 and drives the sliding shaft 48 to move against the inner wall of the inclined rod 410. At this time, the sliding shaft 48 squeezes the inclined rod 410, so that the inclined rod 410 drives the side plate 42 to slide on the side wall of the top plate 46. The side wall of the side plate 42 and the bottom of the clamping plate 45 are fixedly installed with rubber pads 411. The side plate 42 and the rubber pads 411 can be used to clamp the two sides of the spring flat steel, thereby limiting the spring flat steel and further improving the stability of the spring flat steel.

[0037] A method for testing the hardness of a spring flat steel, using the above-mentioned spring flat steel hardness testing device, comprises the following steps:

[0038] S1. Before use, first place the spring flat steel to be tested for hardness inside the machine body 1 and directly below the test head 3;

[0039] S2. When the spring flat steel is placed directly below the test head 3, the hydraulic cylinder 2 is started to drive the test head 3 to move downward, so that the test head 3 contacts the spring flat steel and presses the spring flat steel downward;

[0040] S3. A certain downward pressure is applied by the hydraulic cylinder 2 so that the test head 3 is pressed into the surface of the spring flat steel, and then the indentation diameter is measured to calculate the hardness, thereby obtaining the hardness value of the spring flat steel.

[0041] When the present embodiment is working, firstly, the spring flat steel to be tested for hardness is placed inside the machine body 1 and placed directly below the test head 3. After the spring flat steel is placed directly below the test head 3, the threaded rod 43 is rotated by the handle 412. The rotation of the threaded rod 43 drives the L plate 413 threadably connected thereto to slide on the outer wall of the machine body 1 and gradually move away from the handle 412. At this time, the inclined slide groove 414 provided on the L plate 413 will squeeze the cross bar 49, so that the cross bar 49 drives the positioning plate 41 to slide downward on the side wall of the machine body 1. When the positioning plate 41 slides downward, it will cooperate with the return spring 47. The top plate 46 can drive the positioning rod 44 to move downward synchronously. When the positioning rod 44 moves downward, the clamping plate 45 will move downward synchronously. When the clamping plate 45 contacts the upper surface of the spring flat steel, the clamping plate 45 and the positioning rod 44 will be limited by the spring flat steel, so that the clamping plate 45 and the positioning rod 44 are in a static state. At this time, the elasticity of the return spring 47 cooperates with the positioning plate 41 and the positioning rod 44 to drive the clamping plate 45 to be close to the top of the spring flat steel. The clamping plate 45 can be used to press the spring flat steel into the inside of the machine body 1. When the clamping plate 45 and the positioning rod 44 are in a static state, the top plate 4 6 and the side plate 42 will also be in a static state. At this time, as the positioning plate 41 slides downward, the reset spring 47 will be stretched, and the positioning plate 41 will drive the sliding shaft 48 to fit the inner wall of the inclined rod 410 and move. At this time, the sliding shaft 48 will squeeze the inclined rod 410, so that the inclined rod 410 drives the side plate 42 to slide on the side wall of the top plate 46. At this time, the two sets of side plates 42 will approach each other until the two sets of side plates 42 fit on both sides of the spring flat steel, and the threaded rod 43 can be stopped from rotating. At this time, the side plates 42 can be used to clamp the two sides of the spring flat steel, so that the spring flat steel can be limited. The cooperation with the side plate 42 can fix the spring flat steel in all directions, so that the spring flat steel can be tested for hardness in a stable state, avoiding deformation and displacement of the spring flat steel during the hardness test, which may affect the test data, and thus improve the accuracy of the hardness test value of the spring flat steel. At this time, the hydraulic cylinder 2 can be started to drive the test head 3 to move downward, so that the test head 3 contacts the spring flat steel and squeezes the spring flat steel downward. A certain downward pressure is applied by the hydraulic cylinder 2, so that the test head 3 is pressed into the surface of the spring flat steel, and then the indentation diameter is measured to calculate the hardness, thereby obtaining the hardness value of the spring flat steel.

[0042] See also Figure 1-Figure 9On the basis of the above-mentioned embodiment, another embodiment of the present invention further includes a protection mechanism 5, a protection mechanism 6 and a cleaning mechanism 7. The protection mechanism 5 includes a rotating rod 51, a spiral groove 52, an L rod 53, a slide plate 54, a slide bar 55, an oblique pressure groove 56, a baffle 57 and a transverse groove 58; the rotating rod 51 is rotatably connected to the inner wall of the machine body 1, and the rotating rod 51 passes through the machine body 1. A spiral groove 52 is provided on the rotating rod 51. An L rod 53 is fixedly installed on the side wall of the rotating rod 51. During the rotation of the rotating rod 51, the L rod 53 will be driven to move in contact with the inner wall of the transverse groove 58. At the same time, the L rod 53 will push the baffle 57 to make the baffle 57 slide on the inner wall of the machine body 1. The inner wall of the machine body 1 is slidably connected There is a slide plate 54, the inner wall of which is fixedly mounted a slide bar 55, and the slide bar 55 passes through the slide plate 54, and an oblique pressure groove 56 is provided at the bottom of the L plate 413, and the outer wall of the slide bar 55 fits against the inner wall of the oblique pressure groove 56, and in the process that the L plate 413 slides on the side wall of the body 1 and gradually moves away from the handle 412, the oblique pressure groove 56 will squeeze the slide bar 55, so that the slide bar 55 pushes the slide plate 54, so that the slide plate 54 slides on the inner wall of the body 1 and gradually slides out of the body 1, and the outer wall of the slide bar 55 fits against the inner wall of the spiral groove 52, and when the slide plate 54 slides, the slide bar 55 will fit against the inner wall of the spiral groove 52 and move and squeeze the spiral groove 52, so that the rotating rod 51 rotates on the inner wall of the body 1.

[0043] The inner wall of the body 1 is slidably connected with a blocking cover 57, which is provided with a transverse groove 58. The end of the L rod 53 away from the rotating rod 51 is attached to the inner wall of the transverse groove 58. The blocking cover 57 can slide upward to cover the spring flat steel inside the body 1 to prevent the spring flat steel from being broken by the test head 3 during the hardness test, causing metal debris to splash everywhere and accidentally injure surrounding personnel.

[0044] The protection mechanism 6 comprises a bent rod 61, a protection cover 62, a hollow rod 63, a slider 64, a push rod 65, an oblique through slot 66 and a connecting rod 67; the bent rod 61 is hinged at the top of the machine body 1, and a protection cover 62 is fixedly installed at one end of the bent rod 61. The test head 3 can be covered by the protection covers 62 on the two sets of bent rods 61 to prevent the test head 3 from being hit by hard objects when the machine body 1 is idle. The other end of the bent rod 61 is fixedly installed with a hollow rod 63, and a slider 64 is slidably connected to the top of the machine body 1. A push rod 65 is fixedly installed on the outer wall of the slider 64, and the outer wall of the push rod 65 fits on the hollow rod 6 3, the slider 64 slides and drives the push rod 65 to move in contact with the inner wall of the hollow rod 63, and at the same time, the push rod 65 pushes the hollow rod 63, so that the hollow rod 63 drives the bent rod 61 to rotate on the top of the body 1, and an oblique groove 66 is provided on the blocking cover 57. A connecting rod 67 is fixedly installed on the side wall of the slider 64, and one end of the connecting rod 67 away from the slider 64 is in contact with the inner wall of the oblique groove 66. When the blocking cover 57 slides upward on the inner wall of the body 1, the oblique groove 66 squeezes the connecting rod 67, so that the connecting rod 67 pushes the slider 64, so that the slider 64 slides on the top of the body 1.

[0045] The cleaning mechanism 7 comprises a fixed shaft 71, a gear 72, a driving rack 73, a brush 74 and a driven rack 75; one end of the fixed shaft 71 is fixedly mounted on the outer wall of the machine body 1, and the other end of the fixed shaft 71 is rotatably connected to the gear 72. The outer wall of the L plate 413 is fixedly mounted with a driving rack 73, and the driving rack 73 is meshed with the gear 72. When the L plate 413 slides on the side wall of the machine body 1 and gradually moves away from the handle 412, the driving rack 73 can drive the gear 72 to rotate on the outer wall of the fixed shaft 71, and the side of the machine body 1 is rotated. The wall is slidably connected with a brush 74, and a driven rack 75 is fixedly installed at the bottom of the brush 74. The driven rack 75 is meshed with the gear 72. When the gear 72 rotates, the driven rack 75 meshed with it can drive the brush 74 to slide synchronously on the side wall of the body 1 in the opposite direction of the L plate 413. The sliding of the brush 74 can clean the surface of the spring flat steel to prevent impurities on the surface of the spring flat steel from affecting the downward pressure applied by the test head 3 to the spring flat steel, thereby further improving the data accuracy of the spring flat steel hardness test.

[0046] When this embodiment is working: in the process of the L plate 413 sliding on the side wall of the body 1 and gradually moving away from the handle 412, the oblique pressure groove 56 will squeeze the slide bar 55, so that the slide bar 55 pushes the slide plate 54, so that the slide plate 54 slides on the inner wall of the body 1 and gradually slides out of the body 1, and at the same time, the slide bar 55 will fit the inner wall of the spiral groove 52 and move and squeeze the spiral groove 52, so that the rotating rod 51 rotates on the inner wall of the body 1. During the rotation of the rotating rod 51, the L rod 53 will be driven to fit the inner wall of the transverse groove 58 and move. At the same time, the L rod 53 will push the blocking cover 57 upwards, so that the blocking cover 57 slides upward on the inner wall of the body 1. The upward sliding of the blocking cover 57 can cover the spring flat steel inside the body 1, so as to prevent the spring flat steel from being broken by the test head 3 during the hardness test, causing metal debris to splash everywhere and accidentally injure surrounding staff, so that the staff can perform hardness testing in a safe working environment.

[0047] The protective cover 62 on the two sets of bent rods 61 can cover the test head 3 to prevent the test head 3 from being hit by hard objects when the machine body 1 is idle. When the blocking cover 57 slides upward on the inner wall of the machine body 1, the oblique through groove 66 will squeeze the connecting rod 67, so that the connecting rod 67 pushes the slider 64, so that the slider 64 slides on the top of the machine body 1. At this time, the slider 64 will drive the push rod 65 to move against the inner wall of the hollow rod 63. At the same time, the push rod 65 will push the hollow rod 63, so that the hollow rod 63 drives the bent rod 61 to rotate on the top of the machine body 1. When the bent rod 61 rotates, it will drive the protective cover 62 gradually away from the test head 3, so that the protective cover 62 is separated from the protection of the test head 3, so that the test head 3 can move downward to perform a hardness test on the spring flat steel.

[0048] As the L-plate 413 slides on the side wall of the body 1 and gradually moves away from the handle 412, the driving rack 73 can drive the gear 72 to rotate on the outer wall of the fixed shaft 71. While the gear 72 rotates, the driven rack 75 meshing with it can drive the brush 74 to slide synchronously on the side wall of the body 1 in the opposite direction of the L-plate 413. The sliding of the brush 74 can clean the surface of the spring flat steel to prevent impurities on the surface of the spring flat steel from affecting the downward pressure applied by the test head 3 to the spring flat steel, thereby further improving the data accuracy of the spring flat steel hardness test.

[0049] The above generally describes the present invention in detail, but it is obvious to a person skilled in the art that some modifications or improvements can be made to the present invention. Therefore, modifications or improvements that do not depart from the spirit of the present invention are within the scope of protection of the present invention.

Claims

1. A spring flat steel hardness testing device, comprising a body (1), characterized in that: A hydraulic cylinder (2) is fixedly mounted on the top of the machine body (1), a test head (3) is fixedly mounted on the piston end of the hydraulic cylinder (2), a positioning mechanism (4) for improving the stability of the spring flat steel is provided on the machine body (1), a protection mechanism (5) is provided on the machine body (1), a protection mechanism (6) for protecting the test head (3) is provided on the machine body (1), and a cleaning mechanism (7) is provided on the machine body (1); The positioning mechanism (4) comprises a positioning plate (41), a side plate (42), a threaded rod (43), a positioning rod (44), a clamping plate (45), a top plate (46), a return spring (47), a sliding shaft (48), a cross bar (49), an inclined rod (410), a rubber pad (411), a handle (412), an L plate (413) and an inclined slide groove (414); the positioning plate (41) is slidably connected to the side wall of the machine body (1), and the inner wall of the positioning plate (41) is slidably connected to the side wall of the machine body (1). The positioning plate (41) is connected to the positioning rod (44) and the positioning rod (44) passes through the positioning plate (41). The bottom of the positioning rod (44) is fixedly installed with a clamping plate (45). The top of the positioning rod (44) is fixedly installed with a top plate (46). The bottom of the top plate (46) is fixedly installed with a return spring (47). One end of the return spring (47) away from the top plate (46) is fixedly installed on the top of the positioning plate (41). The side wall of the positioning plate (41) is fixedly installed The side wall of the positioning plate (41) is fixedly installed with a cross bar (49), the side plate (42) is slidably connected to the side wall of the top plate (46), the outer wall of the side plate (42) is fixedly installed with an inclined rod (410), the outer wall of the sliding shaft (48) is fitted on the inner wall of the inclined rod (410), the side wall of the side plate (42) and the bottom of the clamping plate (45) are fixedly installed with a rubber pad (411), one end of the threaded rod (43) is rotatably connected to the machine The inner wall of the body (1), the other end of the threaded rod (43) passes through the body (1) and is fixedly installed with a handle (412), the threaded rod (43) is rotatably connected to the penetration point of the body (1), the outer wall of the body (1) is slidably connected with an L plate (413), the L plate (413) is threadedly connected to the threaded rod (43), the L plate (413) is provided with an inclined groove (414), and the outer wall of the cross bar (49) is in contact with the inner wall of the inclined groove (414).

2. A spring flat steel hardness testing device according to claim 1, characterized in that: The protection mechanism (5) comprises a rotating rod (51), a spiral groove (52), an L rod (53), a slide plate (54), a sliding rod (55), an oblique pressure groove (56), a blocking cover (57), and a transverse groove (58); the rotating rod (51) is rotatably connected to the inner wall of the machine body (1), and the rotating rod (51) passes through the machine body (1); the rotating rod (51) is provided with a spiral groove (52), and the side wall of the rotating rod (51) is fixedly mounted with an L rod (53).

3. A spring flat steel hardness testing device according to claim 1, characterized in that: The inner wall of the body (1) is slidably connected to a slide plate (54), the inner wall of the slide plate (54) is fixedly mounted with a slide rod (55), and the slide rod (55) passes through the slide plate (54); an oblique pressure groove (56) is provided at the bottom of the L plate (413), the outer wall of the slide rod (55) is in contact with the inner wall of the oblique pressure groove (56), and the outer wall of the slide rod (55) is in contact with the inner wall of the spiral groove (52).

4. A spring flat steel hardness testing device according to claim 2, characterized in that: The inner wall of the machine body (1) is slidably connected with a blocking cover (57), a transverse groove (58) is provided on the blocking cover (57), and one end of the L rod (53) away from the rotating rod (51) is attached to the inner wall of the transverse groove (58).

5. A spring flat steel hardness testing device according to claim 1, characterized in that: The protection mechanism (6) comprises a bent rod (61), a protection cover (62), a hollow rod (63), a slider (64), a push rod (65), an oblique slot (66) and a connecting rod (67); the bent rod (61) is hinged to the top of the machine body (1), one end of the bent rod (61) is fixedly mounted with the protection cover (62), and the other end of the bent rod (61) is fixedly mounted with the hollow rod (63).

6. A spring flat steel hardness testing device according to claim 4, characterized in that: The top of the body (1) is slidably connected to a slider (64), the outer wall of the slider (64) is fixedly mounted with a push rod (65), the outer wall of the push rod (65) is fitted against the inner wall of the hollow rod (63), an oblique groove (66) is provided on the blocking cover (57), a connecting rod (67) is fixedly mounted on the side wall of the slider (64), and one end of the connecting rod (67) away from the slider (64) is fitted against the inner wall of the oblique groove (66).

7. A spring flat steel hardness testing device according to claim 1, characterized in that: The cleaning mechanism (7) comprises a fixed shaft (71), a gear (72), a driving rack (73), a brush (74) and a driven rack (75); one end of the fixed shaft (71) is fixedly mounted on the outer wall of the machine body (1), and the other end of the fixed shaft (71) is rotatably connected to the gear (72).

8. A spring flat steel hardness testing device according to claim 1, characterized in that: A driving rack (73) is fixedly mounted on the outer wall of the L-plate (413), and the driving rack (73) is meshed with the gear (72).

9. A spring flat steel hardness testing device according to claim 1, characterized in that: A brush (74) is slidably connected to the side wall of the machine body (1), a driven rack (75) is fixedly mounted on the bottom of the brush (74), and the driven rack (75) is meshed with the gear (72).

10. A method for testing the hardness of a spring flat steel, using the device for testing the hardness of a spring flat steel according to claim 9, characterized in that: The following steps are involved: S1. Before use, first place the spring flat steel to be tested for hardness inside the machine body (1) and directly below the test head (3); S2. When the spring flat steel is placed directly below the test head (3), the hydraulic cylinder (2) is started to drive the test head (3) to move downward, so that the test head (3) contacts the spring flat steel and presses the spring flat steel downward; S3. A certain downward pressure is applied by the hydraulic cylinder (2) so that the test head (3) is pressed into the surface of the spring flat steel, and then the indentation diameter is measured to calculate the hardness, thereby obtaining the hardness value of the spring flat steel.

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