A full-automatic rockwell hardness tester with nose-down pressing

Abstract

The utility model relates to a kind of nose down-pressing type full-automatic Rockwell hardness tester, by being set between frame body and base screw component, can accurately convert rotational motion into linear motion, provide stable moving basis for cover and relevant components, guide rail assembly guides cover relative frame body to move, provide stable orientation for cover movement, reduce the shaking and displacement deviation in movement process, guide column and linear bearing are used in conjunction with, provide stable support and orientation for the movement of guide block, second stepper motor matched with first stepper motor is equipped in base, through the collaborative work of two stepper motors, the automation control of nose's down-pressing, measurement and the like process can be realized, displacement sensor assembly installed on guide block, the displacement of guide block can be measured accurately in real time, sensor is installed on sensor gasket, and extend to cover outside through notch, so that sensor can directly perceive and measure relevant physical quantity.

Description

Technical Field

[0001] This utility model relates to the field of Rockwell hardness tester technology, and in particular to a fully automatic Rockwell hardness tester with a head-down pressing type. Background Technology

[0002] Traditional Rockwell hardness testers mostly operate manually or semi-automatically, which suffers from problems such as large human error, low efficiency, and poor repeatability. With the improvement of industrial automation, higher requirements are placed on the accuracy, efficiency, and stability of testing equipment. Existing automatic Rockwell hardness testers mostly use simple lead screws or hydraulic drives for their head pressing mechanism, which has defects such as low transmission accuracy, insufficient rigidity, and susceptibility to environmental interference. Some devices lack effective protective structures, making precision measuring elements susceptible to dust, oil contamination, or mechanical impact, resulting in poor long-term stability. In addition, traditional displacement detection methods are not sensitive enough to achieve micron-level precision measurement, affecting the accuracy and reliability of hardness test results. Utility Model Content

[0003] In view of this, the purpose of this utility model is to provide a fully automatic Rockwell hardness tester with a head-down pressing type that has high measurement accuracy, strong motion stability, high degree of automation and good protection performance.

[0004] To achieve the above objectives, this utility model employs a fully automatic Rockwell hardness tester with a downward-pressing head, comprising a base and a frame mounted on the base. A lead screw assembly is provided between the frame and the base. A cover is provided at one end of the frame, and the cover is connected to the frame via a support plate mounted on the cover. A guide rail assembly for guiding the cover to move relative to the frame is provided between the frame and the support plate. A downward-pressing head base plate is fixed to the support plate inside the cover. A first stepper motor is mounted on the downward-pressing head base plate. A sensor washer is mounted on one side of the first stepper motor on the downward-pressing head base plate. A sensor is mounted on one end of the sensor washer corresponding to the base, and a guide block is mounted on the other end. The cover has a slot corresponding to the sensor, through which the sensor extends to the outside of the cover. Guide posts are provided at both ends of the downward-pressing head base plate corresponding to the guide block. Linear bearings are sleeved on the guide posts and mounted on the guide blocks. A displacement sensor assembly is mounted on the guide blocks. A second stepper motor is provided inside the base to cooperate with the first stepper motor to achieve fully automatic control.

[0005] The beneficial effects of the above structure are as follows: by setting a lead screw assembly between the frame and the base, rotational motion can be accurately converted into linear motion, providing a stable moving foundation for the cover and related components, ensuring the positional accuracy of the pressing head, and improving the accuracy of Rockwell hardness measurement. The guide rail assembly guides the movement of the cover relative to the frame, providing stable guidance for the movement of the cover and reducing swaying and displacement deviation during the movement. The guide column and linear bearing work together to provide stable support and guidance for the movement of the guide block. The base is equipped with a second stepper motor that works in conjunction with the first stepper motor. Through the coordinated work of the two stepper motors, the pressing and measurement processes of the machine head can be automated. The displacement sensor assembly installed on the guide block can accurately measure the displacement of the guide block in real time. The sensor is installed on the sensor washer and extends to the outside of the cover through the slot, so that the sensor can directly sense the physical quantities related to the measurement.

[0006] This utility model is further configured such that the displacement sensor assembly includes a connecting plate disposed on a guide block, a short lead screw assembly is installed between the connecting plate and the guide block, a displacement sensor fixing plate is installed on one side of the connecting plate, a displacement sensor fixing piece is installed on one side of the displacement sensor fixing plate, a displacement sensor is installed on one side of the displacement sensor fixing piece, a lever bracket is installed on the other side of the connecting plate, a lever shaft is connected inside the lever bracket, and both ends of the lever shaft are respectively connected to a lever bearing cover disposed inside the lever bracket, a lever is sleeved on the lever shaft, a connecting rod is connected to the front end of the lever, a needle roller is connected to the front end of the connecting rod, the needle roller passes through a sensing head disposed at one end of the displacement sensor, and a small gap is maintained between the needle roller and the sensing head. By installing a short lead screw assembly between the connecting plate and the guide block, the tiny displacement of the guide block can be accurately transmitted to the connecting plate, reducing errors in the transmission process and thus improving the accuracy of displacement measurement. At the same time, the lever mechanism composed of the lever bracket, lever shaft, and lever can amplify the tiny displacement of the connecting rod and the needle roller. The lever bearing cover can provide stable support and fixation for the lever shaft, reducing its shaking and offset during rotation. The design of the tiny gap between the needle roller and the sensing head reduces frictional resistance, enabling the needle roller to move quickly and sensitively. The displacement sensor can detect changes in a timely manner, allowing the measurement results to reflect the actual situation more accurately and in real time.

[0007] This utility model is further configured as follows: the lead screw assembly includes a lead screw connected between the frame and the base. The top end of the lead screw is provided with a lead screw support seat mounted on the frame. The base has a receiving groove corresponding to the lead screw. The frame has an opening for connection with the lead screw at the receiving groove. A lead screw bearing seat is provided in the receiving groove and fitted on the bottom of the lead screw. A sealing element located on the lead screw is fitted in the lead screw bearing seat. A first synchronous pulley is fitted on the lead screw at the lower end of the lead screw bearing seat. A roller bearing is also provided between the first synchronous pulley and the lead screw bearing seat and fitted on the lead screw. The lead screw and the support plate are connected by a lead screw nut seat fitted on the lead screw. A nut is also provided at the lower end of the lead screw nut seat and fitted on the lead screw. The nut is connected to the lead screw nut seat. The top of the lead screw is fixed to the frame by the lead screw support seat, and the bottom is supported by the lead screw bearing seat in the base receiving groove, forming a double stable support system at the top and bottom. This effectively prevents the lead screw from bending, deforming or shaking during operation, ensuring its precise linear movement. At the same time, the lead screw and the support plate are double connected by the lead screw nut seat and the nut, which enhances the connection strength and stability, ensuring that the cover and related components move smoothly and accurately.

[0008] This utility model further comprises a guide rail assembly including guide rails symmetrically installed on the inner wall of the frame and extending along the frame. The upper and lower ends of the cover are each provided with a guide rail slider adapted to each of the guide rails. The guide rails symmetrically installed on the inner wall of the frame and extending along the frame provide a precise reference for the movement of the cover. Combined with the guide rail sliders at the upper and lower ends of the cover that adapt to each guide rail, the cover moves without deviation or wobbling, ensuring the accuracy of the machine head's downward pressure and measurement position. The double-guide-rail, double-slider structure forms four support points, which can evenly distribute the force on the cover's movement, avoiding shaking and vibration caused by uneven force distribution. Simultaneously, the guide rails extending along the frame provide long-stroke stable guiding support for the cover, ensuring smooth movement throughout the entire process.

[0009] This utility model is further configured as follows: the short ball screw assembly includes a short ball screw and a ball bearing sleeve fitted on the short ball screw. A screw locking nut connected to a connecting plate, a deep groove ball bearing located at the lower end of the screw locking nut, and a gear located at the lower end of the deep groove ball bearing are respectively fitted onto the ball bearing sleeve. A thrust needle roller bearing fitted on the ball bearing sleeve is also provided between the gear and the deep groove ball bearing. The end of the short ball screw is connected to a guide block. Through the rolling friction cooperation of the short ball screw and the ball bearing sleeve, friction and error accumulation are greatly reduced. Simultaneously, the multi-layered positioning support system formed by the screw locking nut, deep groove ball bearing, thrust needle roller bearing, and gear precisely defines the position of the ball bearing sleeve from multiple directions, effectively reducing motion offset and vibration, enabling the connecting plate to move precisely in a straight line, and improving the working accuracy of the equipment.

[0010] This utility model is further configured such that the bottom plate of the pressing head has a motor slot corresponding to the first stepper motor. Motor side plates are fixedly installed on both sides of the motor slot on the bottom plate of the pressing head, and motor mounting plates are installed on the motor side plates. The first stepper motor is installed in the motor slot, and its shaft end is connected through a through hole in the motor mounting plate. The motor slot provides a precise installation position for the first stepper motor, ensuring the coaxiality of the motor shaft and the transmission components. The motor side plates and motor mounting plates form a frame support structure, enhancing the fixation of the motor, withstanding vibration and reaction forces, reducing noise and wear, extending the motor's lifespan, and simultaneously improving the overall strength and rigidity of the bottom plate of the pressing head.

[0011] This utility model is further configured such that a motor fixing plate is provided inside the base. A second stepper motor is mounted on one end of the motor fixing plate, and a second synchronous pulley is provided on the other end. A motor column connected to the base is provided at one end of the motor fixing plate and the second synchronous pulley. A slot is formed on the motor fixing plate, and the shaft end of the second stepper motor is connected to the second synchronous pulley through the slot. The motor fixing plate provides stable support for the second stepper motor and the second synchronous pulley, bearing the vibration, torque, and tension during operation. The motor column firmly connects the support plate to the base to form an integral frame. The shaft end of the second stepper motor is connected to the second synchronous pulley through the slot, ensuring the coaxiality between the motor and the pulley.

[0012] This invention is further configured such that both sides of the guide post are fixed to the bottom plate of the pressing head. This multi-point support layout effectively disperses the pressure on the pressing head, preventing excessive stress at a single point from causing structural deformation and damage. Simultaneously, it provides lateral support to the pressing head, enhancing its resistance to lateral forces, preventing deviation and swaying during operation, and ensuring stable pressing operation.

[0013] This utility model is further configured such that upper shell plates are installed on both sides of the frame, and a rear cover is provided at the rear end of the frame. The upper shell plates have snap-fit ​​protrusions that connect to the rear cover, and the rear cover has snap-fit ​​grooves that match the snap-fit ​​protrusions on the upper shell plates. This snap-fit ​​connection requires no additional tools; installers can easily connect the upper shell plates and the rear cover by simply pressing them together, significantly shortening installation time and improving efficiency. Furthermore, the precise positioning of the snap-fit ​​protrusions and grooves reduces installation errors and improves installation quality.

[0014] This invention is further configured such that a cover plate is connected to the upper end of the housing and the support plate, and the cover plate completely covers the upper end of the housing and the support plate. By completely covering the upper end of the housing and the support plate with the cover plate, dust, particles and other impurities in the air can be effectively blocked from entering the housing, and liquids can also be prevented from accidentally splashing in, improving the waterproof performance of the equipment and enhancing its adaptability in humid environments. Attached Figure Description

[0015] Figure 1This is a structural schematic diagram of an embodiment of the present utility model.

[0016] Figure 2 This is an exploded view of the base and frame in conjunction with the lead screw assembly according to an embodiment of this utility model.

[0017] Figure 3 This is a schematic diagram of the lead screw assembly structure according to an embodiment of the present utility model.

[0018] Figure 4 This is an exploded view of the frame and cover assembly and guide rail assembly of this utility model embodiment.

[0019] Figure 5 This is a schematic diagram of the internal structure of the casing according to an embodiment of the present utility model.

[0020] Figure 6 This is a schematic diagram of the displacement sensor structure according to an embodiment of the present invention.

[0021] Figure 7 This is a schematic diagram of the short lead screw assembly structure according to an embodiment of the present invention.

[0022] Figure 8 This is a schematic diagram of the assembly of the second stepper motor inside the base of this utility model embodiment. Detailed Implementation

[0023] like Figures 1-8 As shown, an embodiment of this utility model provides a fully automatic Rockwell hardness tester with a head-down pressing mechanism, including a base 1 and a frame 2 mounted on the base 1. Upper shell plates 21 are respectively installed on both sides of the frame 2, and a rear cover 22 is provided at the rear end of the frame 2. The upper shell plates 21 have a latching protrusion that connects to the rear cover 22, and the rear cover 22 has a latching groove that matches the latching protrusion of the upper shell plates 21. A lead screw assembly 3 is provided between the frame 2 and the base 1. The lead screw assembly 3 includes a lead screw 31 connected between the frame 2 and the base 1. The top end of the lead screw 31 has a lead screw support 32 mounted on the frame 2. The base 1 has a receiving groove 11 corresponding to the lead screw 31, and the frame 2 has a corresponding receiving groove 11. The groove 11 has an opening 23 for connection with the lead screw 31. The groove 11 contains a lead screw bearing seat 33 fitted at the bottom of the lead screw 31. The lead screw bearing seat 33 contains a seal 34 located on the lead screw 31. The lead screw 31 has a first synchronous pulley 35 fitted at the lower end of the lead screw bearing seat 33. A roller bearing 36 fitted on the lead screw 31 is also provided between the first synchronous pulley 35 and the lead screw bearing seat 33. The lead screw 31 is connected to the support plate 41 through a lead screw nut seat 37 fitted on the lead screw 31. The lower end of the lead screw nut seat 37 is also provided with a nut 38 fitted on the lead screw 31. The nut 38 is connected to the lead screw nut seat 37.

[0024] A cover 4 is provided at one end of the frame 2. The cover 4 is connected to the frame 2 by a support plate 41 installed on the cover 4. A guide rail assembly 5 is provided between the frame 2 and the support plate 41 to guide the cover 4 to move relative to the frame 2. The guide rail assembly 5 includes two guide rails 51 symmetrically installed on the inner wall of the frame 2 and extending along the frame 2. Two guide rail sliders 52 are adapted on each guide rail 51. The upper and lower ends of the cover 4 are respectively equipped with guide rail sliders 52 corresponding to the two guide rails 51. A cover plate 42 is also connected to the upper end of the cover 4 and the support plate 41. The cover plate 42 completely covers the upper end of the cover 4 and the support plate 41.

[0025] The housing 4 contains a pressing head base plate 6 fixed to the support plate 41. A first stepper motor 61 is mounted on the pressing head base plate 6. The pressing head base plate 6 has a motor slot corresponding to the first stepper motor 61. Motor side plates 62 are fixedly mounted on both sides of the motor slot on the pressing head base plate 6. Motor mounting plates 63 are mounted on the motor side plates 62. The first stepper motor 61 is installed in the motor slot, and its shaft end is connected through a through hole in the motor mounting plate 63. A sensor is mounted on one side of the pressing head base plate 6. The washer 64 and sensor washer 64 are respectively equipped with a sensor 65 at one end of the base 1 and a guide block 66 at the other end. The cover 4 is provided with a slot corresponding to the sensor 65. The sensor 65 extends to the outside of the cover 4 through the slot. The bottom plate of the pressure head is provided with guide posts 67 at both ends corresponding to the guide block 66. A linear bearing 68 is sleeved on the guide post 67 and is installed on the guide block 66. The two sides of the guide post 67 are provided with columns 69 fixed on the bottom plate of the pressure head 6. The displacement sensor assembly 7 is installed on the guide block 66.

[0026] The displacement sensor assembly 7 includes a connecting plate 71 mounted on a guide block 66. A short lead screw assembly 8 is installed between the connecting plate 71 and the guide block 66. The axis of the short lead screw assembly 8 is parallel to the downward pressing direction of the machine head. A displacement sensor fixing plate 72 is mounted on one side of the connecting plate 71. A displacement sensor fixing piece 73 is mounted on one side of the displacement sensor fixing plate 72. A displacement sensor 74 is mounted on one side of the displacement sensor fixing piece 73. A lever bracket 75 is mounted on the other side of the connecting plate 71. A lever shaft is connected inside the lever bracket 75, and both ends of the lever shaft are connected to lever bearing covers 76 installed inside the lever bracket 75. A lever 77 is sleeved on the lever shaft. A connecting rod 78 is connected to the front end of the lever 77. A needle roller 79 is connected to the front end of the connecting rod 78. The needle roller 79 passes through a sensing head 741 installed at one end of the displacement sensor 74, and a small gap is maintained between the needle roller 79 and the sensing head 741. This small gap is used to ensure that the needle roller 79 can move flexibly, and at the same time, the displacement sensor 74 can accurately detect the displacement change of the needle roller 79.

[0027] The short ball screw assembly 8 includes a short ball screw 81 and a ball bearing sleeve 82 fitted on the short ball screw 81. The ball bearing sleeve 82 is fitted with a screw locking nut 83 connected to the connecting plate 71, a deep groove ball bearing 84 located at the lower end of the screw locking nut 83, and a gear 85 located at the lower end of the deep groove ball bearing 84. A thrust needle roller bearing 86 fitted on the ball bearing sleeve 82 is also provided between the gear 85 and the deep groove ball bearing 84. The end of the short ball screw 81 is connected to the guide block 66.

[0028] The base 1 is equipped with a motor fixing plate 12. A second stepper motor 13 is installed at one end of the motor fixing plate 12, and a second synchronous pulley 14 is provided at the other end. The motor fixing plate 12 is provided with four motor columns 15 connected to the base 1 at one end of the second synchronous pulley 14. The motor fixing plate 12 is provided with slots. The shaft end of the second stepper motor 13 is connected to the second synchronous pulley 14 through the slots. The second stepper motor 13 and the first stepper motor 61 cooperate to achieve fully automatic control.

[0029] Of course, in addition to the above embodiments, this utility model may have other various embodiments. Without departing from the essential technical solution of this utility model, those skilled in the art can make various corresponding changes and modifications based on this utility model, and these changes or modifications are equivalent to the technical solution in this patent. Therefore, these corresponding changes and modifications should all fall within the protection scope of the appended claims of this utility model.

Claims

1. A fully automatic Rockwell hardness tester with a head-down pressing mechanism, characterized in that: The device includes a base and a frame mounted on the base. A lead screw assembly is provided between the frame and the base. A cover is provided at one end of the frame, and the cover is connected to the frame via a support plate mounted on the cover. A guide rail assembly is provided between the frame and the support plate to guide the cover to move relative to the frame. A pressing head base plate is provided inside the cover and fixed to the support plate. A first stepper motor is mounted on the pressing head base plate. A sensor washer is mounted on one side of the pressing head base plate with the first stepper motor. A sensor is mounted on one end of the sensor washer corresponding to the base, and a guide block is mounted on the other end. The cover has a slot corresponding to the sensor, and the sensor extends to the outside of the cover through the slot. Guide posts are provided at both ends of the pressing head base plate corresponding to the guide block. Linear bearings are sleeved on the guide posts and mounted on the guide blocks. A displacement sensor assembly is mounted on the guide blocks. A second stepper motor is provided inside the base to cooperate with the first stepper motor to achieve fully automatic control.

2. The fully automatic Rockwell hardness tester with head-down pressure as described in claim 1, characterized in that: The displacement sensor assembly includes a connecting plate mounted on a guide block, a short lead screw assembly installed between the connecting plate and the guide block, a displacement sensor fixing plate mounted on one side of the connecting plate, a displacement sensor fixing piece mounted on one side of the displacement sensor fixing plate, a displacement sensor mounted on one side of the displacement sensor fixing piece, and a lever bracket mounted on the other side of the connecting plate. A lever shaft is connected inside the lever bracket, and both ends of the lever shaft are connected to lever bearing caps installed inside the lever bracket. A lever is sleeved on the lever shaft, and a connecting rod is connected to the front end of the lever. A needle roller is connected to the front end of the connecting rod, and the needle roller passes through a sensing head installed at one end of the displacement sensor, with a small gap maintained between the needle roller and the sensing head.

3. The fully automatic Rockwell hardness tester with head-down pressure as described in claim 1 or 2, characterized in that: The lead screw assembly includes a lead screw connected between the frame and the base. The top of the lead screw has a lead screw support mounted on the frame. The base has a receiving groove corresponding to the lead screw. The frame has an opening corresponding to the receiving groove for connection with the lead screw. A lead screw bearing seat is fitted inside the receiving groove and mounted on the bottom of the lead screw. A seal is fitted inside the lead screw bearing seat. A first synchronous pulley is fitted at the lower end of the lead screw bearing seat. A roller bearing is also fitted on the lead screw between the first synchronous pulley and the lead screw bearing seat. The lead screw and the support plate are connected via a lead screw nut seat fitted on the lead screw. A nut is fitted on the lead screw at the lower end of the lead screw nut seat, and the nut engages with the lead screw nut seat.

4. The fully automatic Rockwell hardness tester with head-down pressure as described in claim 3, characterized in that: The guide rail assembly includes guide rails symmetrically installed on the inner wall of the frame and extending along the frame. The upper and lower ends of the cover are each provided with a guide rail slider adapted to each of the guide rails.

5. The fully automatic Rockwell hardness tester with head-down pressure as described in claim 2, characterized in that: The short ball screw assembly includes a short ball screw and a ball bearing sleeve fitted on the short ball screw. The ball bearing sleeve is fitted with a screw locking nut connected to a connecting plate, a deep groove ball bearing located at the lower end of the screw locking nut, and a gear located at the lower end of the deep groove ball bearing. A thrust needle roller bearing fitted on the ball bearing sleeve is also provided between the gear and the deep groove ball bearing. The end of the short ball screw is connected to a guide block.

6. The fully automatic Rockwell hardness tester with head-down pressure as described in claim 1, characterized in that: The bottom plate of the pressing head has a motor slot corresponding to the first stepper motor. Motor side plates are fixedly installed on both sides of the motor slot on the bottom plate of the pressing head. Motor mounting plates are installed on the motor side plates. The first stepper motor is installed in the motor slot, and its shaft end is connected through a through hole opened on the motor mounting plate.

7. The fully automatic Rockwell hardness tester with head-down pressure as described in claim 1, characterized in that: The base is provided with a motor fixing plate. A second stepper motor is installed at one end of the motor fixing plate and a second synchronous pulley is provided at the other end. A motor column connected to the base is provided at one end of the motor fixing plate and a slot is provided on the motor fixing plate. The shaft end of the second stepper motor is connected to the second synchronous pulley through the slot.

8. The fully automatic Rockwell hardness tester with head-down pressure as described in claim 1, characterized in that: Both sides of the guide post are provided with uprights fixed to the bottom plate of the lower pressure head.

9. The fully automatic Rockwell hardness tester with head-down pressure as described in claim 1, characterized in that: The frame is equipped with upper shell plates on both sides, and a rear cover is provided at the rear end of the frame. The upper shell plate is provided with a latching protrusion that connects to the rear cover, and the rear cover is provided with a latching groove that matches the latching protrusion of the upper shell plate.

10. The fully automatic Rockwell hardness tester with head-down pressure as described in claim 1, characterized in that: The upper end of the cover and the support plate is also connected to a cover plate, which completely covers the upper end of the cover and the support plate.

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