Brinell hardness tester with double objective lenses and double pressure heads

Abstract

The utility model relates to a double-objective double-pressure-head Brinell hardness tester which comprises a shell, a turntable housing is arranged at the inner top of the shell, and a rotatable four-functional-position turret mechanism is arranged in the turntable housing. By adopting the four-functional-position turret mechanism, different testing functions can be quickly switched in the same equipment, the whole testing head does not need to be replaced or the equipment does not need to be recalibrated, meanwhile, the platform lifting mechanism is introduced, so that a testing sample can be accurately adjusted to the optimal testing position, and the testing efficiency is improved. The display screen embedded in the laminated board provides an intuitive user interface, so that an operator can easily check test parameters, test results and state information, the hardness tester can observe indentations under different magnification times due to the design of the double objective lenses, and the measurement accuracy and flexibility are improved; due to the design of the double detection pressure heads, the durometer can easily meet different test requirements.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of brinell hardness tester, especially to a double objective lens double pressure head brinell hardness tester. BACKGROUND

[0002] Hardness test is one of important indexes for measuring material mechanical properties, and brinell hardness test as an important method of hardness test is widely used in hardness detection of metal materials. The traditional brinell hardness tester usually adopts the structure of single objective lens and single pressure head, and this structure has certain limitations in the test process, for example, the test range is limited, the test precision is insufficient, etc. With the progress of science and technology and the development of industry, the requirement for hardness test equipment is higher and higher, and the traditional brinell hardness tester has been difficult to meet the demand of modern industry for high-precision and high-efficiency hardness test. SUMMARY

[0003] Therefore, the utility model aims at providing a double objective lens double pressure head brinell hardness tester with multiple measuring functions, simple operation, high measuring accuracy and good stability.

[0004] In order to realize the above purpose, the utility model adopts a double objective lens double pressure head brinell hardness tester, which comprises a shell, the front surface of the shell is provided with a veneer, the veneer is embedded with a display screen, the inner top of the shell is provided with a turntable cover, the turntable cover is provided with a four-function position turret mechanism which can rotate, one side of the four-function position turret mechanism is provided with an eyepiece mechanism, the observation end of the eyepiece mechanism extends to the outside of the veneer through the opening formed in the veneer, the shell is provided with a main shaft mechanism, one end of the main shaft mechanism is connected with the four-function position turret mechanism, one side of the main shaft mechanism is provided with a lever mechanism, the inner bottom of the shell is provided with a platform lifting mechanism, and the platform lifting mechanism is located on the vertically opposite side of the four-function position turret mechanism.

[0005] The above structure has the beneficial effects that the four-function position turret mechanism is adopted to realize the quick switching of different test functions in the same equipment, the whole test head does not need to be replaced or the equipment does not need to be recalibrated, so that the test efficiency and flexibility are significantly improved. Meanwhile, the introduction of the platform lifting mechanism enables the test sample to be accurately adjusted to the best test position, the display screen embedded in the veneer provides an intuitive user interface, so that the operator can easily check the test parameters, test results and state information, the observation end of the eyepiece mechanism extends to the outside through the opening in the veneer, which is convenient for the operator to directly observe the test process, the design of the double objective lens enables the hardness tester to observe the indentation under different magnification, improves the accuracy and flexibility of measurement, and the design of the double detection pressure head enables the hardness tester to easily adapt to different test requirements.

[0006] The utility model further sets up as platform elevating mechanism includes the screw rod assembly, hand wheel and the lifting platform connected with the screw rod assembly installed in the bottom of the casing, the screw rod assembly includes the screw rod axle sleeve fixed in the bottom of the casing, the screw rod in the screw rod axle sleeve, the screw rod nut matched with the screw rod, one side of screw rod axle sleeve is equipped with the motor drive arrangement installed in the casing, the motor drive arrangement includes motor mounting plate, the drive motor fixed on the motor mounting plate and the drive pulley connected with the drive motor output shaft, the hand wheel is installed on the screw rod, and is located the top of screw rod axle sleeve, and is connected with the drive pulley through the transmission belt, the casing is equipped with the screw rod cover above the screw rod assembly, the screw rod cover covers the screw rod and hand wheel and drive pulley, the screw rod cover is opened the screw rod mouth for the screw rod movement, the top of screw rod is connected with the lifting platform threadedly. Platform elevating mechanism realizes the lifting function through the screw rod assembly, and the precision cooperation of screw rod nut and screw rod ensures the high accuracy and stability in the lifting process, makes the lifting platform be able to move smoothly, accurately in the vertical direction, thereby guaranteeing the accurate control of sample position in the hardness test process, the introduction of motor drive arrangement makes platform elevating mechanism can realize electric lifting through drive motor, improves the test efficiency, the setting of screw rod cover not only covers the screw rod, hand wheel and drive pulley, prevents the invasion of dust and sundries, simultaneously, the screw rod mouth opened on the screw rod cover ensures the smoothness of screw rod in the movement process, avoids the lifting failure caused by friction or jam.

[0007] The utility model further sets up as four functional position turret mechanism includes support plate, turret motor connection mechanism of installing in support plate upper surface one side and four functional position turret assembly of being located support plate below, four functional position turret assembly includes turret, center shaft assembly of setting in turret, first objective lens and second objective lens and first detection pressure head assembly and second detection pressure head assembly are connected in the periphery of turret respectively, one end of center shaft assembly is connected with support plate, and the other end extends to the outside of the disc cover through the center mouth of opening in the turret. The design of four functional position turret mechanism makes that hardness gauge can equip first objective lens and second objective lens simultaneously, and first detection pressure head assembly and second detection pressure head assembly, and this kind of multi-functional configuration allows hardness gauge to switch different observation and detection tools quickly in single test, to improve test efficiency.

[0008] The utility model further sets up to first detection pressure head subassembly and second detection pressure head subassembly all include the linear motion ball bearing of installation on the turret, and the detection pressure head rod of the inner ring of linear motion ball bearing is worn, the top of detection pressure head rod is fixed with pressure head rod cap, the end of detection pressure head rod is inserted and is connected with steel ball pressure head, the linear motion ball bearing with pressure head rod cap is equipped with spring washer, spring washer is tight respectively in the above of linear motion ball bearing and the below of pressure head rod cap, spring is installed between spring washer, detection pressure head rod is still set up with adjusting ring in the one end of steel ball pressure head, the observation end of first objective and second objective and the steel ball pressure head end of first detection pressure head subassembly and second detection pressure head subassembly all extend outside the disc cover. Detection pressure head subassembly passes through the cooperation of linear motion ball bearing and detection pressure head rod, realizes the accurate movement and positioning of pressure head in the measurement process, the setting of spring washer and spring plays the role of buffering and protection, when steel ball pressure head contacts with sample, spring can absorb part of impact force, thereby protecting pressure head and sample from being damaged, the setting of adjusting ring makes the user can adjust the position and height of pressure head as required, thereby adapting to different measurement requirements and sample types.

[0009] The utility model further sets up to first objective and second objective in one end of support board all correspond with mirror assembly, mirror assembly includes mirror cover and sets up the mirror in mirror cover lower extreme, the mirror cover with turret passes through first stand column connection. Through the setting of mirror assembly has effectively enhanced the utilization of light, when light passes through objective and enters the hardness tester, mirror can reflect part light, makes it again through objective, thereby has increased the passing amount of light, has improved the brightness and definition of measurement.

[0010] The utility model further sets up to turret motor connecting mechanism includes the turret motor connecting plate of installation in support plate upper surface one side, installs the motor support on the turret motor connecting plate, installs turret motor between motor support and turret motor connecting plate, the motor axle end of turret motor is connected with small pulley. Turret motor connecting mechanism passes through the design of turret motor connecting plate and motor support, firmly installs turret motor on support plate, has realized the compact structure and the optimization of space, the motor axle end of turret motor is connected with small pulley, can realize efficient transmission.

[0011] The utility model further sets up for eyepiece mechanism includes the eyepiece adjusting block of installing on the upper surface opposite another side of support plate, the eyepiece adjusting piece of installing in one side of eyepiece adjusting block, the eyepiece block of installing in one side of eyepiece adjusting piece, the eyepiece tube of being inserted in on the eyepiece block, the eyepiece of being inserted to the end of eyepiece tube and the joint, the auxiliary frame is installed to the eyepiece tube of turret, the third objective lens is equipped on the auxiliary frame. Eyepiece mechanism passes through the combination of eyepiece adjusting block, eyepiece adjusting piece, eyepiece block, eyepiece tube and eyepiece, has realized the accurate adjustment and the amplification of observation image, so that the observer can adjust the position and focal length of eyepiece as needed, to obtain more clear, detailed observation image, the third objective lens of being equipped on the auxiliary frame further increases the magnification of system, so that the observer can observe more tiny details.

[0012] The utility model further sets up that the shell still includes hall installation block and power supply installation board in, hall installation block is located one side of lever assembly, and installs on the inner wall of shell, one end of hall installation block is fixed with hall support, the arc slot is seted up on the hall support, the arc slot is equipped with hall switch, the hall switch is clamped on the hall support through nut, the power supply installation board is installed on the inner wall of shell opposite with hall installation block. Through the design of hall installation block and hall support and hall switch on it, it can perceive the displacement or rotation state of lever assembly, and is fed back to control system in the form of electric signal, so that the hardness tester can monitor the motion state of lever assembly in real time, accurately, thereby realizing the accurate control to the measurement process, the design of power supply installation board provides stable power supply support for the hardness tester, it can transmit power signal to each component that needs power supply, ensures the normal operation of hardness tester.

[0013] The utility model further sets up that the side wall of support plate still is equipped with photoelectric fixed piece and steel ball positioning piece respectively, photoelectric fixed piece is installed with photoelectric switch, steel ball positioning piece is equipped with steel ball positioning block on the one end of facing turret, the steel ball positioning block is seted up with hole, and the steel ball is embedded in the hole, still be equipped with positioning piece fixed block on steel ball positioning piece, still be equipped with positioning connecting block and positioning needle on the turret. Through the addition of photoelectric fixed piece and photoelectric switch, in combination with positioning connecting block and positioning needle on the turret, accurate position feedback mechanism is provided for the turret, when the turret rotates to the specified position, the positioning needle can accurately trigger the photoelectric switch, thereby ensuring the accurate positioning of the turret in the measurement or observation process, the design of steel ball positioning piece and steel ball positioning block realizes the accurate positioning of the steel ball through the cooperation of the steel ball and the hole, not only improves the positioning accuracy, but also enhances the stability of positioning, so that the turret can keep accurate position during rotation or movement.

[0014] The utility model further sets up that the upper cover plate and rear cover plate and side cover plate are equipped with on the casing, the side cover plate is equipped with respectively the triangle switch and printer, the bottom of casing is equipped with still the bottom foot. Through the setting of upper cover plate, rear cover plate and side cover plate, the complete external protection is provided for the hardness tester, these cover plates not only can prevent dust, moisture and other external factors from invading the inside of hardness tester, but also can effectively prevent the damage caused by accidental collision, the triangle switch and printer of side cover plate are equipped with, make the user be able to conveniently control the start and stop of hardness tester and print the measurement result, improved the operation convenience of hardness tester, also convenient for the user to maintain and check the equipment, the setting of bottom foot makes the hardness tester be able to be placed stably on the horizontal plane, avoids the shaking or inclination caused by uneven ground. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is the structure schematic diagram of the utility model embodiment.

[0016] Figure 2 It is the internal structure schematic diagram of the utility model embodiment.

[0017] Figure 3 It is the platform lifting mechanism explosion schematic diagram of the utility model embodiment.

[0018] Figure 4 It is the four function position turret mechanism explosion schematic diagram of the utility model embodiment.

[0019] Figure 5 It is the detection pressure head assembly explosion schematic diagram of the utility model embodiment.

[0020] Figure 6 It is the structure schematic diagram of the reflector assembly on the turret of the utility model embodiment.

[0021] Figure 7 It is the structure schematic diagram of the eyepiece mechanism and third objective lens of the utility model embodiment.

[0022] Figure 8 It is the explosion schematic diagram of the hall installation block and power supply installation board and casing of the utility model embodiment.

[0023] Figure 9 It is the hall switch installation structure side view on the hall installation block of the utility model embodiment.

[0024] Figure 10 It is the explosion schematic diagram of the support plate and turret of the utility model embodiment.

[0025] Figure 11 It is the main shaft mechanism explosion schematic diagram of the utility model embodiment.

[0026] Figure 12 is the front view of the spindle mechanism of the utility model embodiment.

[0027] Figure 13 is the cooperation side view of the spindle mechanism and the lever mechanism of the utility model embodiment.

[0028] Figure 14 is the three-dimensional schematic diagram of the lever mechanism of the utility model embodiment.

[0029] Figure 15 is the three-dimensional schematic diagram of the shell of the utility model embodiment. DETAILED DESCRIPTION

[0030] As Figures 1-15 shown, the embodiment of the utility model provides a kind of double objective lens double pressure head brinell hardness tester, including shell 1, the front surface of shell 1 is equipped with veneer 2, veneer 2 is inlayed with display screen 21, the inner top of shell 1 is equipped with turntable cover 3, turntable cover 3 is equipped with four function position turret mechanism 4 rotatable in, one side of four function position turret mechanism 4 is equipped with eyepiece mechanism 5, the observation end of eyepiece mechanism 5 extends to the outside of veneer 2 by the opening 22 of opening set in veneer 2, the inner bottom of shell 1 is equipped with spindle mechanism 6, one end of four function position turret mechanism 4 is connected with spindle mechanism 6, one side of spindle mechanism 6 is equipped with lever mechanism 7, the inner bottom of shell 1 is equipped with platform lifting mechanism 8, platform lifting mechanism 8 is located in the vertical opposite side of four function position turret mechanism 4, shell 1 is also equipped with upper cover plate 11 and back cover plate 12 and side cover plate 13, side cover plate 13 is respectively equipped with pin-shaped switch 131 and printer 132, the bottom end of shell 1 is also equipped with four bottom feet 14.

[0031] As Figures 2-3 shown, platform lifting mechanism 8 includes screw rod assembly 81 installed in the inner bottom of shell 1, hand wheel 82 and lifting platform 83 connected with screw rod assembly 81, screw rod assembly 81 includes screw rod shaft sleeve 811 fixed in the inner bottom of shell 1, screw rod 812 threaded in screw rod shaft sleeve 811, screw rod nut 813 matched with screw rod 812, one side of screw rod shaft sleeve 811 is equipped with motor drive device 84 installed in shell 1, motor drive device 84 includes motor mounting plate 841, driving motor 842 fixed on motor mounting plate 841 and driving pulley 843 connected with the output shaft of driving motor 842, hand wheel 82 is installed on screw rod 812, and is located above screw rod shaft sleeve 811, and is connected with driving pulley 843 by transmission belt (not shown in the drawing), shell 1 is equipped with screw rod cover 15 above screw rod assembly 81, screw rod cover 15 covers screw rod 812 and hand wheel 82 and driving pulley 843, screw rod cover 15 is equipped with the screw rod mouth for the movement of screw rod 812, the top end of screw rod 812 is threadedly connected with lifting platform 83.

[0032] As Figure 4 shown, the four-function turret mechanism 4 includes a support plate 41, a turret motor connecting mechanism 42 mounted on the upper surface of the support plate 41, and a four-function turret assembly 43 arranged below the support plate 41, the four-function turret assembly 43 including a turret 44, a central shaft assembly 45 arranged in the turret 44, a first objective lens 46 and a second objective lens 47 respectively connected around the turret 44, and a first detection pressure head assembly and a second detection pressure head assembly, one end of the central shaft assembly 45 being connected with the support plate 41, and the other end extending out of the turntable cover 3 through a central opening 441 formed on the turret 44, the turret motor connecting mechanism 42 including a turret motor connecting plate 421 mounted on the upper surface of the support plate 41, and a motor bracket 422 mounted on the turret motor connecting plate 421, a turret motor 423 being mounted between the motor bracket 422 and the turret motor connecting plate 421, the motor shaft end of the turret motor 423 being connected with a small pulley 424, the small pulley 424 being connected with a driven pulley (not shown in the figure) on the turret 44 through a transmission belt (not shown in the figure) to form a transmission system, and the central shaft assembly 45 in the figure only shows the central shaft itself, but it can be understood that in actual application, the central shaft assembly 45 also includes necessary bearings, shaft sleeves, fixing members, etc. to ensure smooth rotation and accurate positioning of the central shaft.

[0033] As Figure 5 shown, the first detection pressure head assembly and the second detection pressure head assembly are the same components, so only one detection pressure head assembly is described as an example, both detection pressure head assemblies including a linear motion ball bearing 48 mounted on the turret 44, and a detection pressure head rod 481 arranged in the inner ring of the linear motion ball bearing 48, the top end of the detection pressure head rod 481 being fixed with a pressure head rod cap 482, the end being inserted and clamped with a steel ball pressure head 483, two spring washers 484 being arranged between the linear motion ball bearing 48 and the pressure head rod cap 482, the two spring washers 484 being respectively close to the upper side of the linear motion ball bearing 48 and the lower side of the pressure head rod cap 482, a spring 485 being mounted between the spring washers 484, and the detection pressure head rod 481 being further sleeved with an adjusting ring 486 at the end of the steel ball pressure head 483, the observation ends of the first objective lens 46 and the second objective lens 47 and the steel ball pressure head ends of the two detection pressure head assemblies all extending out of the turntable cover 3.

[0034] As Figure 6 shown, the first objective lens 46 and the second objective lens 47 each correspondingly have a mirror assembly 49 arranged at one end of the support plate 41, the mirror assembly 49 including a mirror cover 491 and a mirror 492 arranged at the lower end of the mirror cover 491, and the mirror cover 491 and the turret 44 being connected through two first vertical columns 493.

[0035] As Figure 7As shown, the eyepiece mechanism 5 includes an eyepiece adjusting block 51 mounted on the upper surface of the support plate 41 on the opposite side, an eyepiece adjusting piece 52 mounted on one side of the eyepiece adjusting block 51, an eyepiece block 53 mounted on one side of the eyepiece adjusting piece 52, an eyepiece tube 54 inserted through the eyepiece block 53, an eyepiece 55 extending into the end of the eyepiece tube 54 and clamped, and the turret 44 is provided with an auxiliary mirror holder 442 corresponding to the eyepiece tube 55, and the auxiliary mirror holder 442 is provided with a third objective lens 443, wherein the auxiliary mirror holder 442 and the third objective lens 443 are not aligned due to the drawing relationship.

[0036] As shown in the drawings, Figures 8-9 As shown, the housing 1 further includes a Hall mounting block 16 and a power supply mounting plate 17, the Hall mounting block 16 is located on one side of the lever assembly 7 and is mounted on the inner wall of the housing 1, one end of the Hall mounting block 16 is fixed with a Hall bracket 161, two circular arc grooves are formed in the Hall bracket 161, and a Hall switch 162 is arranged in each circular arc groove, and the Hall switch 162 is clamped on the Hall bracket 161 through two nuts 163, and the power supply mounting plate 17 is mounted on the inner wall of the housing 1 opposite to the Hall mounting block 16.

[0037] As shown in the drawings, Figure 10 As shown, the side wall of the support plate 41 is further provided with a photoelectric fixed piece 40 and a steel ball positioning piece 50, the photoelectric fixed piece 40 is provided with a photoelectric switch 401 at one end corresponding to the turret 44, the steel ball positioning piece 50 is provided with a steel ball positioning block 501 at one end facing the turret 44, the steel ball positioning block 501 is provided with a hole, and a steel ball 502 is embedded in the hole, and the upper and lower ends of the steel ball positioning piece 50 are further provided with positioning piece fixing blocks 503 for fixing, and the turret 44 is further provided with three positioning connecting blocks 444 and a positioning needle 445.

[0038] As shown in the drawings, Figures 11-12 As shown, the spindle mechanism 6 mainly includes a shaft seat 61, a sensor 62, a spindle 63, a spindle bushing 65 and a spindle compression spring 66, the shaft seat 61 is provided with the sensor 62 at one end and the spindle 63 at the other end, the sensor 62 extends to the lower end through a reserved slot in the support plate 41 and clamps a pressure head support 64, the pressure head support 64 extends to the lower end through the reserved slot in the support plate 41, the other end of the shaft seat 61 is provided with the spindle bushing 65 sleeved on the outer surface of the spindle 63 to reduce friction, then the spindle compression spring 66 is wound above the spindle bushing 65 to provide pre-tightening force, a recess is formed in the end of the spindle 63 away from the shaft seat 61, and a main tool pad 67 is arranged in the recess, and a round tool tip 671 is arranged on the main tool pad 67, the entire spindle mechanism 6 is packaged by a spindle seat 68 and a spindle cover 69, and is connected with the support plate 41 through the second stand column 60.

[0039] As shown in the drawings, Figures 13-14As shown, the lever mechanism 7 is arranged on one side of the spindle mechanism 6, mainly composed of bottom plate 71, stepper motor assembly 72, load wire rod assembly 73 and lever assembly 74 and other key components, the bottom plate 71 is firmly installed with motor mounting plate 721, and then fixes the stepper motor 722, the stepper motor 722 as a power source, the motor shaft end is ingeniously connected with pulley 723, which is used for transmitting power, the load wire rod assembly 73 is built in the bottom plate 71, and the core components include screw sleeve 731 and load wire rod 732, the outer wall of the screw sleeve 731 is sequentially sleeved with lower bearing, middle spacer ring and upper circular nut, these components together ensure the stability and accuracy of the structure, the lower end of the screw sleeve 731 is closely clamped in the large pulley 733, and cooperates with the large pulley to realize the transmission and conversion of power, the top end of the load wire rod 732 bears the lever assembly 74, the lever assembly 74 includes connecting seat 741 and rear lever 742, the connecting seat 741 is provided with the rear lever 742, the rear lever 742 is provided with bearing 744 on both sides of the tail end through lever shaft 743, so that the stability and accuracy of the rear lever 742 in the movement process are ensured, the rear lever 742 is provided with magnet seat 77 on the side facing the hall switch 162, the magnet seat 77 is provided with magnet and cap 78, the connecting seat 741 and the load wire rod 732 are closely connected through the connecting piece 75, forming a stable whole, ensuring the stability and reliability of the lever mechanism 74, in addition, the rear lever 742 is provided with auxiliary lever assembly 76, the auxiliary lever assembly 76 includes knife pad frame 761, lever knife pad 762 and lever knife tip 763 and other components, the inner top end and the inner bottom end of the knife pad frame 761 are provided with lever knife pad and lever knife tip, the lever knife pad is provided with lever knife tip, forming a stable support structure, the rear lever 742 is provided on the lever knife tip of the inner bottom end of the knife pad frame 761, at the same time, the lever knife tip of the inner top end of the knife pad frame 76 is also provided with auxiliary lever 762, the tail end of the auxiliary lever 762 is provided with spindle port, which just accommodates the top end of the spindle 63, realizes the accurate connection with the round knife tip 671 on the spindle 63, so as to ensure the efficient, stable and reliable operation of the lever mechanism 74.

[0040] The first objective lens 46 is a 1 times objective lens, the second objective lens 47 is a 2 times objective lens, the third objective lens 443 is a 0.8 times objective lens, the steel ball indenter 483 in the first and second detection indenter assemblies is respectively 2.5 mm in diameter and 5 mm in diameter, and a 10 mm diameter can be replaced through actual operation.

[0041] Of course, in addition to the above-mentioned embodiments, the utility model can have other various embodiments, without departing from the content of the utility model technical scheme, those skilled in the art can make various corresponding changes and deformation according to the utility model, and these changes or deformation and the technical scheme in the patent are equivalent, then these corresponding changes and deformation should belong to the protection scope of the claims attached to the utility model.

Claims

1. A dual objective dual indenter Brinell hardness tester characterized by: The utility model provides a four function position turret mechanism, a platform lifting mechanism, a main shaft mechanism, a lever mechanism and an eyepiece mechanism are arranged in the shell, and the four function position turret mechanism is arranged in the rotary disc cover shell in the shell, the platform lifting mechanism is arranged in the bottom of the shell, the main shaft mechanism is connected with one end of the four function position turret mechanism, the lever mechanism is arranged on one side of the main shaft mechanism, and the eyepiece mechanism is arranged on one side of the four function position turret mechanism.

2. The dual objective dual indenter Brinell hardness tester of claim 1, wherein: The platform lifting mechanism comprises a screw rod assembly, a hand wheel and a lifting platform connected with the screw rod assembly and installed in the bottom of the shell, the screw rod assembly comprises a screw rod sleeve fixed in the bottom of the shell, a screw rod arranged in the screw rod sleeve and a screw rod nut matched with the screw rod, one side of the screw rod sleeve is provided with a motor driving device installed in the shell, the motor driving device comprises a motor mounting plate, a driving motor fixed on the motor mounting plate and a driving pulley connected with the output shaft of the driving motor, the hand wheel is installed on the screw rod and located above the screw rod sleeve and connected with the driving pulley through a transmission belt, the shell is provided with a screw rod cover above the screw rod assembly, the screw rod cover covers the screw rod, the hand wheel and the driving pulley, the screw rod cover is provided with a screw rod opening for the movement of the screw rod, and the top end of the screw rod is threadedly connected with the lifting platform.

3. Double objective dual puncher Brinell hardness tester according to claim 1 or 2, characterized in that: The four function position turret mechanism comprises a support plate, a turret motor connecting mechanism installed on one side of the upper surface of the support plate and a four function position turret assembly arranged below the support plate, the four function position turret assembly comprises a turret, a central shaft assembly arranged in the turret, a first objective lens and a second objective lens and a first detection pressure head assembly and a second detection pressure head assembly connected around the turret, one end of the central shaft assembly is connected with the support plate, and the other end extends out of the rotary disc cover shell through a central opening arranged on the turret.

4. The dual objective dual indenter Brinell hardness tester of claim 3, wherein: The first detection pressure head assembly and the second detection pressure head assembly each comprise a linear motion ball bearing installed on the turret and a detection pressure head rod arranged in the inner ring of the linear motion ball bearing, the top end of the detection pressure head rod is fixed with a pressure head rod cap, the end of the detection pressure head rod is inserted into and clamped with a steel ball pressure head, a spring washer is arranged between the linear motion ball bearing and the pressure head rod cap, the spring washer is tightly attached to the upper side of the linear motion ball bearing and the lower side of the pressure head rod cap respectively, a spring is arranged between the spring washers, an adjusting ring is further arranged on the detection pressure head rod at the end of the steel ball pressure head, and the observation ends of the first objective lens and the second objective lens and the steel ball pressure head ends of the first detection pressure head assembly and the second detection pressure head assembly all extend out of the rotary disc cover shell.

5. The dual objective dual indenter Brinell hardness tester of claim 3, wherein: The first objective lens and the second objective lens each correspond to a mirror assembly arranged at one end of the support plate, the mirror assembly comprises a mirror cover and a mirror arranged at the lower end of the mirror cover, and the mirror cover is connected with the turret through a first stand.

6. The dual objective dual indenter Brinell hardness tester of claim 3, wherein: The turret motor connecting mechanism comprises a turret motor connecting plate installed on one side of the upper surface of the support plate, a motor support installed on the turret motor connecting plate, and a turret motor installed between the motor support and the turret motor connecting plate.

7. The dual objective dual indenter Brinell hardness tester of claim 3, wherein: The eyepiece mechanism comprises an eyepiece adjusting block installed on the other side of the upper surface of the support plate, an eyepiece adjusting piece installed on one side of the eyepiece adjusting block, an eyepiece block installed on one side of the eyepiece adjusting piece, an eyepiece tube inserted into the eyepiece block, and an eyepiece inserted into the end of the eyepiece tube and clamped.

8. The dual objective dual indenter Brinell hardness tester of claim 1, wherein: The shell further comprises a Hall mounting block and a power supply mounting plate, the Hall mounting block is located on one side of the lever assembly and is installed on the inner wall of the shell, one end of the Hall mounting block is fixed with a Hall support, an arc slot is formed in the Hall support, a Hall switch is arranged in the arc slot, the Hall switch is clamped on the Hall support through a nut, and the power supply mounting plate is installed on the inner wall of the shell opposite to the Hall mounting block.

9. The dual objective dual indenter Brinell hardness tester of claim 3, wherein: The side wall of the support plate is further provided with a photoelectric fixing piece and a steel ball positioning piece, the photoelectric fixing piece is provided with a photoelectric switch, the steel ball positioning piece is provided with a steel ball positioning block at the end facing the turret, the steel ball positioning block is provided with a hole, a steel ball is embedded in the hole, a positioning piece fixing block is further installed on the steel ball positioning piece, and a positioning connecting block and a positioning needle are further installed on the turret.

10. The dual objective dual indenter Brinell hardness tester of claim 1 wherein: The shell is further provided with an upper cover plate, a rear cover plate and a side cover plate, the side cover plate is provided with a triangular switch and a printer, and the bottom end of the shell is further provided with a bottom foot.

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