Hardness tester for die steel

Abstract

This invention relates to the field of new material testing and hardness testing technology, specifically providing a hardness tester for mold steel. The tester includes a guide tube, which is hollow inside. A loading sleeve is coaxially and axially slidably mounted on the upper end of the guide tube, communicating with the interior of the guide tube. Multiple support cylinders are arranged circumferentially around the outer periphery of the guide tube, with one end hinged to the outer periphery and the other end magnetically adsorbed onto the surface of the mold steel. A limiting component restricts the rotation angle of the support cylinders, ensuring that the angles are the same when the support cylinders swing to their limit positions. This ensures that the axis of the guide tube is perpendicular to the surface of the mold steel, guaranteeing that the impact head impacts the surface of the mold steel perpendicularly, meeting the high-precision requirements of new material testing. Furthermore, half of the support cylinders contain spare impact heads of different materials and specifications. Openings and slots are provided on the support cylinders and the guide tube, respectively. Rotating the support cylinder connects the opening and the slot, allowing for convenient replacement of the impact head. This adapts to the multi-specification and rapid switching requirements of new material testing, improving testing efficiency.

Description

Technical Field

[0001] This invention relates to the field of new material testing and hardness testing technology, and in particular to a hardness tester for mold steel. Background Technology

[0002] In the new materials testing system, mold steel, as a key structural new material, has its hardness as a core indicator for characterizing the mechanical properties of the material and evaluating its grade.

[0003] A hardness tester is a specialized instrument used to measure the surface hardness of materials. Hardness testers are divided into two types: benchtop hardness testers and portable hardness testers. Benchtop hardness testers are mainly used in laboratories and have the advantage of high accuracy. Portable hardness testers are suitable for installed machinery or permanently assembled parts and are easy to carry.

[0004] For example, Chinese patent CN210803089U discloses a handheld Leeb hardness tester with positioning measurement. This design includes a main body and an impact component located on one side of the main body. The main body has a display screen inside, and a control switch is located at the bottom of the display screen. The control switch is located inside the main body. A charging port is located on one side of the main body, and a connector is located on the bottom side of the main body away from the charging port. The impact component consists of a release button, a loading sleeve, a guide tube, a coil, a wire, an impact body, and a support ring. The loading sleeve is located on the top of the guide tube, and the release button is located on the top of the loading sleeve. This design uses a suction cup to fix the support ring to the edge of the detection area. At the same time, the first limiting rod, the second limiting rod, and the anti-slip strip allow the user to load the loading sleeve, thereby performing the hardness testing operation normally.

[0005] However, when using the hardness tester in the above scheme to test in different environments, it is necessary to change the impact head of different specifications and materials, which is quite troublesome. In addition, the operator also needs to fix it to the test part with a suction cup, resulting in low testing efficiency and difficulty in meeting the engineering application requirements of rapid, accurate and multi-scenario testing of new materials. Summary of the Invention

[0006] Therefore, it is necessary to provide a hardness tester for mold steel to address the problems of the current hardness testers, such as the cumbersome process of replacing the impact head and the low testing efficiency, especially the inability to meet the technical requirements of high precision, high efficiency and high adaptability for the testing of new materials.

[0007] The above objectives are achieved through the following technical solutions: A hardness tester for mold steel, comprising: The catheter is hollow inside, and a loading sleeve is coaxially and slidably connected to the catheter. The loading sleeve communicates with the inside of the catheter. A guide post and a chuck are slidably arranged inside the catheter. One end of the guide post and one end of the chuck are coaxial and fixedly connected. An impact head is axially slidably disposed within the guide tube. A connector is provided between the impact head and the chuck. A first elastic element is fixedly disposed on the connector. The first elastic element can push the impact head toward the mold steel. The connector is magnetic to attract the impact head and the chuck. A push rod, which is axially slidably disposed within the guide post, with one end of the push rod abutting against the connector; Multiple support cylinders are evenly distributed around the outer periphery of the conduit. One end of each support cylinder is hinged to the outer periphery of the conduit, and the other end of each support cylinder is magnetic to attract the surface of the mold steel. A limiting component that restricts the rotation angle of multiple support cylinders; The conduit has a through groove on its side wall, and half of the multiple support cylinders contain spare impact heads. The multiple support cylinders have symmetrical openings on their side walls, and the openings are the same size as the through grooves.

[0008] Furthermore, the limiting component includes a limiting ring and a connecting ring. The connecting ring is axially slidably disposed on the outer periphery of the conduit. The limiting ring is rotatably sleeved on the outer periphery of the connecting ring. The outer periphery of the limiting ring is hinged to a plurality of support cylinders. The hinge position has a groove. When the edge of the groove contacts the support cylinder, it restricts the rotation of the support cylinder around the hinge position.

[0009] Furthermore, a positioning ring is fixedly provided on the outer periphery of the catheter tube, the positioning ring is located above the limiting ring, and a second elastic element is provided between the positioning ring and the limiting ring. The second elastic element pushes the limiting ring downward relative to the positioning ring or causes the limiting ring to have a tendency to move downward relative to the positioning ring.

[0010] Furthermore, a cleaning component is provided at the bottom of the conduit, which is used to clean the surface of the mold steel.

[0011] Furthermore, the cleaning assembly includes a cleaning tube, a cavity is provided at the bottom of the connecting ring, a sealing ring is provided on the outer periphery of the conduit, the sealing ring is slidably sealed to the bottom of the cavity, one end of the cleaning tube communicates with the cavity, and the other end of the cleaning tube faces the bottom of the conduit.

[0012] Furthermore, a sealing cylinder is provided between the support cylinder and the spare impact head. A cover plate is hinged to the bottom of the sealing cylinder. The bottom of the sealing cylinder has a switch assembly. The switch assembly is configured to open the cover plate at the bottom of the sealing cylinder when the spare impact head enters the conduit, and to close the cover plate at the bottom of the sealing cylinder when the spare impact head is located inside the support cylinder.

[0013] Furthermore, the switch assembly includes a first magnetic head, a second magnetic head, a third elastic element, and a pull cord. The first magnetic head is fixedly mounted on the side wall of the sealing cylinder. The second magnetic head is located below the first magnetic head and is axially slidably mounted on the side wall of the sealing cylinder. The third elastic element is located between the first and second magnetic heads. The third elastic element pulls the second magnetic head to move closer to the first magnetic head or causes the second magnetic head to tend to move closer to the first magnetic head. One end of the pull cord is connected to the second magnetic head, and the other end of the pull cord is connected to the cover plate.

[0014] Furthermore, a cleaning box is provided on the cover plate at the bottom of the sealing cylinder, the cleaning box contains cleaning fluid, and the tip of the spare impact head inside the sealing cylinder is located inside the cleaning box.

[0015] Furthermore, a roller is rotatably mounted on the magnetic end of the bottom of the support cylinder, and the roller makes rolling contact with the mold steel.

[0016] Furthermore, a sensor is provided on the outer periphery of the catheter.

[0017] The beneficial effects of this invention are: This invention utilizes multiple circumferentially distributed support cylinders, each hinged at one end to the outer circumference of a guide tube. The other end of each cylinder is magnetically attached to the surface of the mold steel. A limiting component restricts the rotation angle of the support cylinders, ensuring that the angle remains constant when the cylinders reach their extreme positions. This guarantees that the guide tube axis is perpendicular to the mold steel surface, ensuring that the impact head impacts the mold steel surface perpendicularly. This improves the accuracy of testing results for mold steel and other new materials. Furthermore, half of the support cylinders contain spare impact heads of different materials and specifications. Openings and slots are provided on both the support cylinders and the guide tube. Rotating the support cylinder connects the openings and slots, allowing for convenient replacement of the impact head. This invention can quickly adapt to the testing needs of multiple grades of mold steel and other new materials, improving testing efficiency.

[0018] This invention cleans the surface of mold steel by setting a cleaning component at the bottom of the conduit, avoiding the influence of dust and other impurities on the hardness test results, providing stable and reliable testing conditions for the testing of new materials such as mold steel, and ensuring the accuracy of the test results. The cleaning component uses the airflow generated by the change in the volume of the cavity at the bottom of the connecting ring to clean the surface of the mold steel through the cleaning tube.

[0019] This invention uses a sealing cylinder to seal the spare impact head between the support cylinder and the spare impact head. The bottom switch assembly can control the opening and closing of the cover plate according to the usage status of the impact head to protect the spare impact head. In addition, a cleaning box is set at the bottom to maintain the impact head and keep it in the best working condition, ensuring the long-term stable operation of the core component for new material testing. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of a hardness tester for mold steel provided in an embodiment of the present invention; Figure 2 for Figure 1 A front view of a hardness tester for mold steel provided in one embodiment; Figure 3 for Figure 2 A cross-sectional view along AA of a mold steel hardness tester provided in one embodiment; Figure 4 for Figure 3 A partially enlarged view of part X of the mold steel hardness tester provided in one embodiment; Figure 5 for Figure 3 A partially enlarged view of the Y-section of the mold steel hardness tester provided in one embodiment; Figure 6 for Figure 1 A top view of a mold steel hardness tester provided in one embodiment; Figure 7 for Figure 6 A cross-sectional view along BB of a mold steel hardness tester provided in one embodiment; Figure 8 for Figure 7 A partially enlarged view of part Z of the mold steel hardness tester provided in one embodiment; Figure 9 A schematic diagram of the connecting ring and limiting ring of a mold steel hardness tester provided in an embodiment of the present invention; Figure 10 This is a schematic diagram of the impact head and sealing cylinder of a mold steel hardness tester provided in an embodiment of the present invention; Figure 11 This is a schematic diagram of the testing state structure of a hardness tester for mold steel according to an embodiment of the present invention; Figure 12 for Figure 11 A schematic diagram of the internal structure of a hardness tester for mold steel provided in one embodiment; Figure 13 for Figure 12 A partial enlarged view of part U of the hardness tester for mold steel provided in one embodiment; Figure 14 for Figure 13 A partially enlarged view of part V of the mold steel hardness tester provided in one embodiment.

[0021] in: 100. Loading sleeve; 110. End cap; 120. Loading spring; 130. Guide tube; 131. Through groove; 140. Release button; 141. Reset spring; 150. Guide post; 160. Chuck; 170. Connector; 180. Push rod; 190. First elastic element; 200, Support cylinder; 210, Roller; 220, Opening; 230, Connecting ring; 231, Ring groove; 232, Air inlet; 233, Air outlet; 234, Cleaning pipe; 240, Limiting ring; 241, Groove; 242, Hinge post; 250, Fixing ring; 260, Second elastic element; 270, Guide groove; 280, Sealing ring; 300. Sealing cylinder; 310. Cover plate; 320. First magnetic head; 330. Second magnetic head; 340. Third elastic element; 350. Pull cord; 360. Cleaning box; 400, First columnar groove; 410, Second columnar groove; 420, Third columnar groove; 430, Fourth columnar groove; 440, Fifth columnar groove; 450, First spring-loaded post; 460, Second spring-loaded post; 500, convex ring; 510, sensor; 520, spare impact head. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0023] The component designations used in this document, such as "first" and "second," are merely for distinguishing the described objects and do not have any sequential or technical meaning. The terms "connection" and "linkage" used in this invention, unless otherwise specified, include both direct and indirect connections (linkages). It should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are used only for the convenience of describing the invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the invention.

[0024] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0025] The following reference Figures 1-14 This invention describes a hardness tester for mold steel.

[0026] A hardness tester for mold steel is suitable for hardness testing of mold steel, especially for testing high-end mold steel new materials. It includes a guide tube 130, which is hollow inside, forming a cylindrical cavity. A loading sleeve 100 is coaxially sleeved on the upper end of the guide tube 130, allowing axial movement relative to the guide tube 130. A loading spring 120 is installed inside the loading sleeve 100, with one end fixedly connected to the upper end of the guide tube 130 and the other end fixedly connected inside the loading sleeve 100. The loading spring 120 is initially in its original position. When the loading sleeve 100 moves downward relative to the conduit 130, it can compress the loading spring 120. The loading spring 120 makes the loading sleeve 100 tend to return to its original position. The loading sleeve 100 in this invention is connected to the inside of the conduit 130. The inside of the loading sleeve 100 is also a cylindrical cavity. The conduit 130 is axially slidably provided with a guide post 150 and a chuck 160. The lower end of the guide post 150 is fixedly connected to the top end of the chuck 160. The bottom of the chuck 160 is provided with a connector 170. The connector 170 can be attracted by the bottom of the chuck 160, and the bottom of the connector 170 is attracted with an impact head.

[0027] To ensure the impact head strikes the mold surface, a first elastic element 190, which is a compression spring, is fixedly mounted on the connector 170. One end of the first elastic element 190 is fixed to the connector 170, and the other end is connected to the outer periphery of the guide post 150. In the initial state, the connector 170 attracts the impact head, causing the impact head to compress the first elastic element 190. A push rod 180 is axially slidably mounted inside the guide post 150, with its lower end abutting against the connector 170. When the operator pushes the push rod 180 downwards... It can push the connector 170 out of the chuck 160. When the connector 170 is out of the chuck 160, the release of the first elastic element 190 is no longer restricted. The first elastic element 190 pushes the connector 170 and the impact head together to rush towards the mold steel. The bottom of the impact head has a tip, which is a collision ball. When the impact head extends out of the guide tube 130, it can contact the mold steel. A sensor 510 is set on the guide tube 130. The sensor 510 is the core acquisition unit for new material detection. The sensor 510 is used to detect the rebound rate of the impact head and thus calculate the hardness of the mold steel.

[0028] To facilitate the reset of the push rod 180, an end cap 110 is fixedly installed on the top of the loading sleeve 100. The bottom of the end cap 110 is fixedly connected to the guide post 150, and a through hole is provided on the end cap 110 to allow the push rod 180 to pass through. A release button 140 is fixedly installed on the end of the push rod 180 that extends out of the through hole. A reset spring 141 is provided between the release button 140 and the through hole. When the operator presses the release button 140, the reset spring 141 can be squeezed, and the reset spring 141 can reset the release button 140 and the push rod 180.

[0029] Existing hardness testers require manual control to ensure the instrument is perpendicular to the surface being tested, thus guaranteeing accuracy. Furthermore, different impact heads need to be replaced in different environments, which is cumbersome and affects testing efficiency. This approach fails to meet the requirements of stability and high efficiency for testing new materials.

[0030] Therefore, to solve the aforementioned positioning and impact head replacement problems, this invention provides multiple support cylinders 200 on the outer periphery near the lower end of the conduit 130. These support cylinders 200 are circumferentially evenly distributed around the outer periphery of the conduit 130. One end of each support cylinder 200 is hinged to the outer periphery of the conduit 130, allowing it to swing up and down around the hinged position. The other end of each support cylinder 200 is magnetic, enabling it to adhere to the surface of the mold steel. A limiting component is provided on the outer periphery of the conduit 130 to limit the swing angle of each support cylinder 200, ensuring that each support cylinder 200 swings to the same angle at its limit position. Since each support cylinder 200 is circumferentially evenly distributed around the outer periphery of the conduit 130, when the swing angles between the multiple support cylinders 200 and the conduit 130 are the same and they are all adhered to the surface of the mold steel, the axis of the conduit 130 is perpendicular to the surface of the mold steel. This allows the impact head inside the conduit 130 to impact the surface of the mold steel perpendicularly, thereby ensuring the accuracy of the test results.

[0031] Meanwhile, half of the multiple support cylinders 200 of the present invention are provided with spare impact heads 520. Each spare impact head 520 has a different material and specifications. The support cylinders 200 with spare impact heads 520 and those without are symmetrical about the center of the guide tube 130. A through groove 131 is formed on the side wall of the guide tube 130, and symmetrically arranged openings 220 are formed on the side wall of the support cylinders 200. The size of the openings 220 is the same as the size of the through grooves 131. When the multiple support cylinders 200 rotate around the axis of the guide tube 130, the openings 220 can respectively communicate with the through grooves 131. When the opening 220 of one support cylinder 200 communicates with the through groove 131, the support cylinder 200... The opening 220 of a symmetrical support cylinder 200 is also connected to the through groove 131. One of the two support cylinders 200 has a spare impact head 520, while the other does not. When it is necessary to replace a different impact head, simply connect the opening 220 of the support cylinder 200 of the spare impact head 520 to the through groove 131. The operator pushes the spare impact head 520 away from the support cylinder 200 and then enters the conduit 130 through the through groove 131. The replaced spare impact head 520 pushes the impact head originally located in the conduit 130 into the other support cylinder 200, thereby completing the replacement of the impact head. This is convenient and quick, greatly improving the switching efficiency and operational continuity of new material testing, and significantly increasing testing efficiency.

[0032] By setting up multiple support cylinders 200, not only can the guide tube 130 be perpendicular to the surface of the mold steel, making the test results more accurate, but different spare impact heads 520 can also be replaced more conveniently and quickly, fully adapting to the diverse and high-frequency testing needs of new materials and maintaining high testing efficiency.

[0033] Specifically, the limiting component in this invention includes a limiting ring 240 and a connecting ring 230. The connecting ring 230 is coaxially disposed on the outer periphery of the conduit 130, and the connecting ring 230 can slide along its axial direction on the outer periphery of the conduit 130. The limiting ring 240 is rotatably sleeved on the outer periphery of the connecting ring 230. The limiting ring 240 is hinged to one end of a plurality of support cylinders 200, such as... Figure 1 , Figure 5 and Figure 11 As shown, the limiting ring 240 has uniformly spaced grooves 241 on its outer circumference. Each groove 241 contains a hinge post 242. One end of each support cylinder 200 is hinged to the hinge post 242 in each groove 241, allowing each support cylinder 200 to rotate around the hinge post 242. The support cylinder 200 is restricted by the grooves 241. When the support cylinder 200 swings outwards until it contacts the edge of the groove 241, the groove 241 restricts further swinging, ensuring that each support cylinder 200 swings at the same angle. This better supports the guide tube 130, making it perpendicular to the mold steel surface. Furthermore, the limiting ring 240 can rotate relative to the connecting ring 230 around its own axis, causing multiple support cylinders 200 to rotate. This allows the opening 220 of the support cylinder 200 to connect with the through groove 131, facilitating quick switching of the backup impact head 520 to adapt to different new material testing conditions.

[0034] More specifically, a fixing ring 250 is fixedly disposed on the outer periphery of the conduit 130. The fixing ring 250 is located above the limiting ring 240. A second elastic element 260 is fixedly connected to the lower end face of the fixing ring 250. The second elastic element 260 is also a compression spring. One end of the second elastic element 260 is connected to the lower end face of the fixing ring 250, and the other end of the second elastic element 260 abuts against the upper end of the limiting ring 240. The second elastic element 260 can compress the limiting ring 240 to move towards the lower end of the conduit 130. Since the multiple support cylinders 200 in this invention are hinged to the limiting ring 240, and a protruding ring 500 is provided in the lower half of the conduit 130, as shown... Figure 1 As shown, when the second elastic element 260 is in a compressed state, the plurality of support cylinders 200 are parallel to each other, and the axes of the plurality of support cylinders 200 are parallel to the axis of the loading cylinder, while the bottoms of the plurality of support cylinders 200 abut against the upper end face of the convex ring 500; Figure 11As shown, when the bottoms of the multiple support cylinders 200 disengage from the convex ring 500, the limiting ring 240 is pressed downward by the second elastic element 260, thereby pushing the multiple support cylinders 200 to rotate outward around the hinge post 242. The lower ends of the multiple support cylinders 200 move radially outward, as... Figure 5 As shown, when the support cylinder 200 contacts the edge of the groove 241 of the limiting ring 240, the support cylinder 200 is restricted to stop rotating. The swing angles of multiple support cylinders 200 are the same, and at the same time, they support the guide tube 130 so that the axis of the guide tube 130 is perpendicular to the surface of the mold steel, ensuring that the impact path is strictly perpendicular when the new material is tested, thus improving the testing accuracy.

[0035] It is understandable that the replacement of the spare impact head 520 is performed when the axes of the multiple support cylinders 200 are parallel to the axis of the guide tube 130. At this time, the operator moves the multiple support cylinders 200 to rotate around the axis of the guide tube 130. When the support cylinder 200 where the spare impact head 520 to be replaced is located is aligned with the through groove 131, the rotation can be stopped, and the operator can push the spare impact head 520 inside the support cylinder 200.

[0036] It should be noted that, as Figure 5 As shown, to facilitate the alignment of the opening 220 of the support cylinder 200 with the through groove 131 when the operator rotates the multiple support cylinders 200, a first spring post 450 is provided at the rotational connection position of the connecting ring 230 and the limiting ring 240. Multiple first columnar grooves 400 are formed on the upper end surface of the connecting ring 230, and a second columnar groove 410 is formed on the inner circumferential side wall of the limiting ring 240. The first spring post 450 is slidably disposed within the first columnar groove 400, and a compression spring is provided within the first columnar groove 400. The compression spring is fixedly connected to the first spring post 450, and pushes the first spring post 450 out of the first columnar groove 400. The end face is spherical. When the first columnar groove 400 and the second columnar groove 410 are set to correspond, one of the multiple support cylinders 200 can correspond to the through groove 131. Therefore, when the spherical end of the first spring 450 extends into the second columnar groove 410, it can be ensured that one support cylinder 200 corresponds to the through groove 131. At this time, the operator can also feel the first spring 450 entering the second columnar groove 410. In this embodiment, the number of first spring 450 and the number of support cylinders 200 are the same, so that the support cylinders 200 can better correspond to the through groove 131. However, when the first spring 450 is disengaged from the second columnar groove 410, the operator needs to increase the force to move the support cylinder 200.

[0037] In a further embodiment, a cleaning component is provided at the bottom of the conduit 130 of the present invention. The cleaning component can clean the surface of the mold steel, so that the impact head inside the conduit 130 will not be affected by dust and other impurities when detecting the hardness of the mold steel surface, eliminating interference factors, ensuring the authenticity and validity of the new material test data, and thus ensuring the accuracy of the mold steel hardness test results.

[0038] Specifically, such as Figure 12 , Figure 13 and Figure 14 As shown, the cleaning assembly in this embodiment includes a cleaning tube 234. An annular groove 231 is formed at the bottom of the connecting ring 230. The annular groove 231 and the outer periphery of the conduit 130 together form a cavity. The lower end of the cavity has an opening. A sealing ring 280 is fixedly installed on the outer periphery of the conduit 130. When the connecting ring 230 is moved downwards by the limiting ring 240, the cavity at the bottom of the connecting ring 230 can slide and seal against the sealing ring 280, thus sealing the cavity. An air inlet 232 is provided on the side wall of the cavity at the bottom of the connecting ring 230. A first one-way valve (not shown in the figure) is provided on the air inlet 232. The first one-way valve only allows gas to enter the cavity from the air inlet 232. An air outlet 233 is provided on the cavity sidewall at the bottom of the connecting ring 230. A second one-way valve (not shown in the figure) is provided on the air outlet 233. The second one-way valve only allows gas to be discharged from the air outlet 233. The air outlet 233 is connected to one end of the cleaning tube 234, and the other end of the cleaning tube 234 is connected to the bottom of the conduit 130. The cleaning tube 234 faces the surface of the mold steel. When the cavity volume of the connecting ring 230 decreases, the gas inside can enter the cleaning tube 234 through the air outlet 233. The gas is blown out through the cleaning tube 234, thereby cleaning the surface of the mold steel and providing a clean and stable testing interface for new material testing.

[0039] It should be noted that when multiple support cylinders 200 support the positioning guide tube 130, the operator can push the guide tube 130 to move in any direction, thereby causing the limiting ring 240 hinged to the multiple support cylinders 200 to drive the connecting ring 230 to move axially back and forth on the guide tube 130. For example, when the connecting ring 230 moves upward, the volume of the cavity increases, and gas enters the cavity from the air inlet 232. When the connecting ring 230 moves downward, the volume of the cavity decreases, and gas is discharged from the air outlet 233. This causes the gas in the cavity at the bottom of the limiting ring 240 to continuously increase and be discharged. The discharged gas is transported to the bottom of the guide tube 130 through the cleaning pipe 234 to clean the surface of the mold steel.

[0040] In a further embodiment, a sealing cylinder 300 is provided between the support cylinder 200 and the spare impact head 520. The sealing cylinder 300 seals the spare impact head 520 within itself, ensuring that the spare impact head 520 is in a sealed state when not in use, protecting the key consumable for new material testing from contamination and maintaining accuracy. The sealing cylinder 300 is slidably disposed within the support cylinder 200, and a cover plate 310 is hinged to the bottom of the sealing cylinder 300. A switch assembly is also provided at the bottom of the sealing cylinder 300, which controls the closing and opening of the cover plate 310, thereby sealing the sealing cylinder 300. When the backup impact head 520 enters the conduit 130, the bottom switch assembly of the sealing cylinder 300 outside the backup impact head 520 opens the cover plate 310, allowing the impact head to be used normally. When the impact head is in normal use, the tip at the bottom of the impact head will bounce off the surface of the mold steel after colliding with it. When the backup impact head 520 is located inside the support cylinder 200, the backup impact head 520 is not used. At this time, the switch assembly will seal the cover plate 310, so that the backup impact head 520 is sealed inside the support cylinder 200 to protect the backup impact head 520.

[0041] It should be noted that, in order to facilitate the smooth passage of the sealing cylinder 300 inside the support cylinder 200 into the conduit 130 through the through groove 131, this embodiment provides a guide groove 270 at the bottom of the through groove 131, and each support cylinder 200 also has a guide groove 270 at its bottom. A guide block is fixedly provided at the bottom of each sealing cylinder 300, and the guide block is located in the guide groove 270. When the support cylinder 200 corresponds to the through groove 131, the guide groove 270 at the bottom of the support cylinder 200 and the guide groove 270 at the bottom of the through groove 131 cooperate with each other, so that the guide block at the bottom of the sealing cylinder 300 slides from the guide groove 270 at the bottom of the support cylinder 200 into the guide groove 270 at the bottom of the through groove 131, thereby enabling the sealing cylinder 300 to smoothly pass through the through groove 131 into the conduit 130.

[0042] To facilitate precise fitting of the sealing cylinder 300 inside the conduit 130, a third columnar groove 420 is provided on the upper bottom surface of each support cylinder 200, and a fourth columnar groove 430 is provided on the edge of the bottom of the sealing cylinder 300. A second spring 460 is provided in the third columnar groove 420, and the shape of the second spring 460 is the same as that of the first spring 450. A compression spring is also provided in the third columnar groove 420, which can push the second spring 460 out of the third columnar groove 420. In this embodiment, when the positions of the third columnar groove 420 and the fourth columnar groove 430 correspond, the sealing cylinder 300 is located in a predetermined position inside the support cylinder 200. When the second spring 460 in the third columnar groove 420 extends into the fourth columnar groove 430, it can be positioned by the second spring 460. If the sealing cylinder 300 needs to be moved, the operator can apply a little force. Furthermore, a fifth columnar groove 440 is provided inside the conduit 130. When the fifth columnar groove 440 corresponds to the fourth columnar groove 430 on the bottom edge of the sealing cylinder 300, the sealing cylinder 300 is located inside the conduit 130. The second spring post 460 inside the fifth columnar groove 440 positions the sealing cylinder 300, which facilitates precise control of the position of the sealing cylinder 300 and avoids the situation where the position of the sealing cylinder 300 is not corresponding, ensuring that the installation position of the spare impact head 520 is accurate and reliable when testing new materials.

[0043] Specifically, such as Figure 8 As shown, in this embodiment, the switch assembly includes a first magnetic head 320, a second magnetic head 330, a third elastic element 340, and a pull rope 350. A space exists on the side wall of the sealing cylinder 300 near the cover plate 310. The first magnetic head 320 is fixedly disposed within this space, and the second magnetic head 330 is slidably disposed within the same space. One end of the pull rope 350 is connected to the second magnetic head 330, and the other end is connected to the end of the cover plate 310 away from the hinge position. The third elastic element 340 is a tension spring; in its initial state, the third elastic element 340 pulls the second magnetic head 330 closer to the first magnetic head 320. 0. The second magnetic head 330 pulls one end of the cover plate 310 through the pull rope 350 to seal the bottom of the sealing cylinder 300. It should be noted that the second magnetic head 330 in this invention is a permanent magnet, and the first magnetic head 320 is an electromagnet. The same poles of the first magnetic head 320 and the second magnetic head 330 are close to each other. Therefore, when the first magnetic head 320 is energized, the first magnetic head 320 can push the second magnetic head 330 downward to move it away from the first magnetic head 320. At this time, the pull rope is loosened, and the cover plate 310 is no longer restricted by the pull rope 350. Under its own gravity, it gradually opens the bottom of the sealing cylinder 300.

[0044] It should be noted that there are two cover plates 310 in this invention, and the two cover plates 310 are symmetrically arranged at the bottom of the sealing cylinder 300. The two cover plates 310 together open or block the bottom of the sealing cylinder 300. In addition, there are also two first magnetic suction head 320, second magnetic suction head 330, tension spring and pull rope 350 in this invention, so as to accommodate the arrangement of the two cover plates 310.

[0045] In a further embodiment, such as Figure 4 As shown, the cover plate 310 of the present invention is provided with a cleaning box 360, which contains cleaning fluid. When the cover plate 310 seals the bottom of the sealing cylinder 300, the tip of the spare impact head 520 will extend into the cleaning box 360 and come into contact with the cleaning fluid. The cleaning fluid can maintain the tip of the spare impact head 520, so that the tip of the spare impact head 520 is in the best condition for a long time, ensuring that the new material detection probe is always in an ideal working state and improving detection stability.

[0046] Specifically, such as Figure 1 and Figure 2 As shown, in this embodiment, a roller 210 is rotatably provided at the bottom of the support cylinder 200. The roller 210 is made of magnetic material and can be adsorbed onto the surface of the mold steel. By setting the roller 210, the frictional force when the bottom of the support cylinder 200 is separated from the convex ring 500 can be reduced, thereby reducing the wear of the bottom of the support cylinder 200 and improving the mobility and service life of the new material testing equipment.

[0047] The specific method of using the mold steel hardness tester provided by the present invention will be described in conjunction with the above embodiments: Adjust the impact head: The operator changes the impact head according to the testing environment. When changing the impact head, the operator rotates multiple support cylinders 200 around the axis of the guide tube 130, rotating the support cylinder 200 containing the required spare impact head 520 to the position corresponding to the through groove 131 of the guide tube 130. The opening 220 of the support cylinder 200 is connected to the through groove 131 of the guide tube 130. The operator pushes the sealing cylinder 300 inside the support cylinder 200 into the guide tube 130. When the sealing cylinder 300 enters the guide tube 130, the first magnetic suction head 320 is energized, thereby pushing the second magnetic suction head 330 away from the first magnetic suction head 320. This causes the tension connected to the second magnetic suction head 330 to loosen, and the cover plate 310 at the bottom of the sealing plate opens under the action of gravity, allowing the tip of the spare impact head 520 to be exposed. The original impact head in the guide tube 130 then enters another support cylinder 200 that does not contain the spare impact head 520, thus completing the replacement of the impact head and realizing the rapid switching of the new material testing probe.

[0048] position: When the bottom of the multiple support cylinders 200 is detached from the convex ring 500, the second elastic element 260 at the bottom of the positioning ring pushes the limiting ring 240, causing the connecting ring 230 to move downward on the guide tube 130. The lower ends of the multiple support cylinders 200 slide in contact with the outer periphery of the convex ring 500, causing the multiple support cylinders 200 to swing upward around the hinge post 242. When the side wall of the support cylinder 200 contacts the edge of the groove 241 of the limiting ring 240, the support cylinder 200 stops swinging upward. The multiple support cylinders 200 swing at the same angle and are fixed. The rollers 210 at the bottom of the multiple support cylinders 200 are magnetic and adsorb onto the surface of the mold steel, thereby connecting the axis of the guide tube 130 perpendicularly to the surface of the mold steel.

[0049] Hardness testing: The operator presses the release button 140 on the top of the loading cylinder. The release button 140 causes the push rod 180 to move downward. The push rod 180 pushes the connector 170, creating a distance between the connector 170 and the chuck 160, thereby weakening the attraction force between the connector 170 and the chuck 160. At this time, the elastic force released by the compression of the first elastic element 190 is greater than the attraction force of the connector 170 to the chuck 160. Therefore, the first elastic element 190 pushes the connector 170 and the impact head toward the mold steel. After the bottom of the impact head hits the mold steel, it rebounds. The rebound speed of the impact head is detected by the sensor 510, thereby calculating the hardness of the mold steel surface to complete the hardness test.

[0050] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0051] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the appended claims.

Claims

1. A hardness tester for mold steel, characterized in that, include: The catheter is hollow inside, and a loading sleeve is coaxially and slidably connected to the catheter. The loading sleeve communicates with the inside of the catheter. A guide post and a chuck are slidably arranged inside the catheter. One end of the guide post and one end of the chuck are coaxial and fixedly connected. An impact head is axially slidably disposed within the guide tube. A connector is provided between the impact head and the chuck. A first elastic element is fixedly disposed on the connector. The first elastic element can push the impact head toward the mold steel. The connector is magnetic to attract the impact head and the chuck. A push rod, which is axially slidably disposed within the guide post, with one end of the push rod abutting against the connector; Multiple support cylinders are evenly distributed around the outer periphery of the conduit. One end of each support cylinder is hinged to the outer periphery of the conduit, and the other end of each support cylinder is magnetic to attract the surface of the mold steel. A limiting component that restricts the rotation angle of multiple support cylinders; The conduit has a through groove on its side wall, and half of the multiple support cylinders contain spare impact heads. The multiple support cylinders have symmetrical openings on their side walls, and the openings are the same size as the through grooves.

2. The hardness tester for mold steel according to claim 1, characterized in that, The limiting component includes a limiting ring and a connecting ring. The connecting ring is axially slidably disposed on the outer periphery of the conduit. The limiting ring is rotatably sleeved on the outer periphery of the connecting ring. The outer periphery of the limiting ring is hinged to a plurality of support cylinders. The hinge position has a groove. When the edge of the groove contacts the support cylinder, it restricts the rotation of the support cylinder around the hinge position.

3. The hardness tester for mold steel according to claim 2, characterized in that, A positioning ring is fixedly provided on the outer periphery of the catheter tube. The positioning ring is located above the limiting ring. A second elastic element is provided between the positioning ring and the limiting ring. The second elastic element pushes the limiting ring downward relative to the positioning ring or causes the limiting ring to have a downward tendency relative to the positioning ring.

4. The hardness tester for mold steel according to claim 3, characterized in that, A cleaning component is provided at the bottom of the conduit, which is used to clean the surface of the mold steel.

5. The hardness tester for mold steel according to claim 4, characterized in that, The cleaning assembly includes a cleaning tube, a cavity at the bottom of the connecting ring, a sealing ring on the outer periphery of the conduit, the sealing ring being slidably and sealingly connected to the bottom of the cavity, one end of the cleaning tube communicating with the cavity, and the other end of the cleaning tube facing the bottom of the conduit.

6. The hardness tester for mold steel according to claim 1, characterized in that, A sealing cylinder is provided between the support cylinder and the spare impact head. A cover plate is hinged to the bottom of the sealing cylinder. The bottom of the sealing cylinder has a switch assembly. The switch assembly is configured to open the cover plate at the bottom of the sealing cylinder when the spare impact head enters the conduit, and to close the cover plate at the bottom of the sealing cylinder when the spare impact head is inside the support cylinder.

7. The hardness tester for mold steel according to claim 6, characterized in that, The switch assembly includes a first magnetic head, a second magnetic head, a third elastic element, and a pull cord. The first magnetic head is fixedly mounted on the side wall of the sealing cylinder. The second magnetic head is located below the first magnetic head and is axially slidably mounted on the side wall of the sealing cylinder. The third elastic element is located between the first and second magnetic heads. The third elastic element pulls the second magnetic head to move closer to the first magnetic head or causes the second magnetic head to tend to move closer to the first magnetic head. One end of the pull cord is connected to the second magnetic head, and the other end of the pull cord is connected to the cover plate.

8. The hardness tester for mold steel according to claim 7, characterized in that, A cleaning box is provided on the cover plate at the bottom of the sealing cylinder. The cleaning box contains cleaning fluid, and the tip of the spare impact head inside the sealing cylinder is located inside the cleaning box.

9. The hardness tester for mold steel according to claim 1, characterized in that, The bottom of the support cylinder has a magnetic end with a rotatable roller that makes rolling contact with the mold steel.

10. The hardness tester for mold steel according to claim 1, characterized in that, A sensor is installed on the outer periphery of the catheter.

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