Ball screw friction and wear mechanism test device

Abstract

The application provides a ball screw pair friction and wear mechanism test device and relates to the technical field of ball screw pair friction and wear mechanism research. The ball screw pair friction and wear mechanism test device comprises a frame body, a first test piece, a second test piece, a first fixing mechanism, a second fixing mechanism, a force applying mechanism, a rotary driving mechanism and a force monitoring mechanism. A first raceway on the first test piece and a second raceway on the second test piece jointly form a cavity suitable for accommodating balls; the force applying mechanism is suitable for applying a load to the first test piece; the rotary driving mechanism is suitable for driving the second test piece to rotate relative to the first test piece; and the force monitoring mechanism is suitable for collecting load information and rotary driving force information. The ball screw pair friction and wear mechanism test device provided by the application can obtain the relationship between the friction torque and the associated parameters under different working conditions, thereby providing better theoretical and technical support for the research on the friction and wear mechanism of the ball screw pair.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of ball screw pair friction and wear mechanism research, and particularly relates to a ball screw pair friction and wear mechanism test device. BACKGROUND

[0002] Ball screw pairs can realize mutual conversion of rotary motion and linear motion, and are widely used in various industries in the mechanical field, such as numerical control machining equipment, robots and other automation products, and the motion accuracy of ball screw pairs can directly affect the accuracy of the feeding system.

[0003] The nut and screw in the ball screw pair are usually installed according to a set pre-tightening force, and with the increase of the use time, the wear between the raceway and the ball accumulates, the pre-tightening force gradually deteriorates, causing the rigidity of the ball screw pair feeding system to become weaker and the positioning accuracy to become poor.

[0004] The friction and wear mechanism of the ball screw pair involves factors such as pre-tightening force, load and friction torque, and a complete and recognized theory has not been established, and there is currently no complete experimental device to study the friction and wear mechanism of the ball screw pair. SUMMARY

[0005] The present application aims to at least solve one of the technical problems in the related art. To this end, the present application provides a ball screw pair friction and wear mechanism test device, which can obtain the relationship between the friction torque and its associated parameters under different working conditions, and provide better theoretical and technical support for studying the friction and wear mechanism of the ball screw pair.

[0006] The present application provides a ball screw pair friction and wear mechanism test device, comprising:

[0007] A frame body;

[0008] A first test piece, wherein a first raceway is arranged on the first test piece;

[0009] A second test piece, wherein a second raceway is arranged on the second test piece, and the second raceway is a planar raceway;

[0010] The first test piece and the second test piece are oppositely arranged, and the first raceway and the second raceway jointly form a cavity suitable for accommodating balls;

[0011] A first fixing mechanism, wherein the first fixing mechanism is arranged on the frame body, and the first test piece is installed on the first fixing mechanism;

[0012] A second fixing mechanism, wherein the second fixing mechanism is arranged on the frame body, and the second test piece is installed on the second fixing mechanism;

[0013] A force applying mechanism is arranged on the frame body, connected with the first test piece, and adapted to apply a load to the first test piece;

[0014] A rotation driving mechanism is arranged on the frame body, connected with the second test piece, and adapted to drive the second test piece to rotate relative to the first test piece;

[0015] A force monitoring mechanism is electrically connected with the force applying mechanism and the rotation driving mechanism, and adapted to collect load information applied by the force applying mechanism to the first test piece, and driving force information applied by the rotation driving mechanism to the second test piece;

[0016] The direction of the load applied by the force applying mechanism to the first test piece is perpendicular to the direction of the rotation axis of the second test piece.

[0017] The ball screw pair friction and wear mechanism test device provided by the embodiment of the application is equivalent to replace the contact state between the ball and the screw raceway in the ball screw pair, so as to obtain the dynamic state of the ball and the related friction and wear mechanism parameters under different working conditions. Specifically, the first test piece is provided with a first raceway, and the second test piece is provided with a second raceway, wherein the second raceway is a plane raceway. The first test piece and the second test piece are oppositely arranged, and the first raceway and the second raceway form a cavity after being overlapped. The ball is placed in the cavity, and the first test piece is fixed in X and Z directions by the first fixing mechanism, and the second test piece is fixed by the second fixing mechanism. Then, the force applying mechanism applies a Y-direction load to the first test piece, and the rotation driving mechanism applies a rotation driving force to the second test piece to drive the second test piece to rotate relative to the first test piece, and the ball rolls in the cavity formed by the first raceway and the second raceway. Under the action of different load forces, the contact force between the ball and the first raceway and the second raceway changes, and the force monitoring mechanism can obtain the size of the load force and the information of the rotation driving force, the rotation torque, and the friction torque, so as to further study the friction and wear characteristics of the ball screw pair under different working conditions. The frame body can provide necessary support for the above-mentioned related structures. The ball screw pair friction and wear mechanism test device provided by the application can obtain the relationship between the friction torque and the related parameters under different working conditions, and provide better theoretical and technical support for studying the friction and wear mechanism of the ball screw pair.

[0018] In addition, the application adopts the structure of a flat raceway, and equivalent replacement is performed on a screw / nut screw raceway, so that the dynamics and contact mechanics state of the ball in the ball screw pair under different working conditions are consistent, and the correctness of the ball screw pair friction and wear mechanism research can be ensured.

[0019] The force monitoring mechanism can monitor parameters such as pre-tightening force, load force and friction torque in real time, without disassembling the pre-tightening structure related to the first test piece and the second test piece, and the operation is convenient, time-saving, and assembly errors caused by multiple disassembling are avoided.

[0020] According to one embodiment of the application, the first fixing mechanism comprises a first sliding table, a second sliding table and a third sliding table connected in sequence, the first sliding table is adapted to reciprocate along the X direction, the second sliding table is adapted to reciprocate along the Z direction, and the third sliding table is adapted to reciprocate along the Y direction, and the first test piece is installed on the third sliding table.

[0021] The second fixing mechanism comprises a fixed disc and a bearing seat, the fixed disc is installed on the frame body through the bearing seat, and the second test piece is installed on the fixed disc.

[0022] The force applying mechanism comprises a wedge-shaped transmission assembly, a first transmission rod, a second transmission rod and a clamping assembly, one end of the first transmission rod is connected with the first test piece, the other end of the first transmission rod is connected with the wedge-shaped transmission assembly, one end of the second transmission rod is connected with the first test piece, the other end of the second transmission rod is connected with the clamping assembly, and the first transmission rod and the second transmission rod are arranged on the opposite sides of the first test piece.

[0023] The rotary driving mechanism comprises a servo motor, a speed reducer, a shaft coupling and a driving shaft connected in sequence, and the driving shaft is arranged in the bearing seat and connected with the fixed disc.

[0024] According to one embodiment of the application, the force monitoring mechanism comprises a torque sensor, a first pressure sensor and a second pressure sensor, the torque sensor is arranged on the base of the speed reducer, the first pressure sensor is arranged on the first transmission rod, and the second pressure sensor is arranged on the second transmission rod.

[0025] According to one embodiment of the application, the wedge-shaped transmission assembly comprises a wedge-shaped movable block, a movable guide seat, a screw rod, a nut and a spring, and the transmission assembly is connected with the first transmission rod through the wedge-shaped movable block.

[0026] The wedge-shaped movable block is slidably connected with the movable guide seat, the screw rod is arranged in the wedge-shaped movable block, one end of the screw rod is connected with the movable guide seat, and the nut is arranged at the other end of the screw rod.

[0027] The spring is arranged on the screw rod, one end of the spring abuts against the wedge-shaped movable block, and the other end of the spring abuts against the movable guide seat.

[0028] According to one embodiment of the present application, the frame body comprises a machine body, a top plate and a bottom plate, and the top plate and the bottom plate are arranged on opposite sides of the machine body.

[0029] The first fixing mechanism, the second fixing mechanism and the force applying mechanism are all mounted on the top plate, and the rotary driving mechanism is mounted on the bottom plate.

[0030] According to one embodiment of the present application, the first test piece is provided with a first ball clamping block and a second ball clamping block, and the first ball clamping block and the second ball clamping block are arranged on both sides of the first raceway.

[0031] According to one embodiment of the present application, the first test piece is provided with a first oil outlet hole and a first pin hole, and the second test piece is provided with a second pin hole.

[0032] The fixed disc is provided with a second oil outlet hole.

[0033] According to one embodiment of the present application, the first test piece is provided with a temperature sensor mounting hole.

[0034] According to one embodiment of the present application, the ball screw pair friction and wear mechanism test device further comprises a foot pad, and the foot pad is arranged at the bottom of the frame body.

[0035] According to one embodiment of the present application, the ball screw pair friction and wear mechanism test device further comprises a handle, and the handle is arranged on the bottom plate. BRIEF DESCRIPTION OF DRAWINGS

[0036] In order to more clearly illustrate the technical solutions of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0037] Figure 1 It is a structural schematic diagram of the ball screw pair friction and wear mechanism test device provided by the embodiment of the present application.

[0038] Figure 2is a structural schematic view of a first fixing mechanism provided by an embodiment of the present application;

[0039] Figure 3 is a structural schematic view of a first test piece provided by an embodiment of the present application;

[0040] Figure 4 is a structural schematic view of a rotating driving mechanism, a second fixing mechanism and a frame body provided by an embodiment of the present application;

[0041] Figure 5 is a structural schematic view of a second fixing mechanism provided by an embodiment of the present application;

[0042] Figure 6 is a structural schematic view of a second test piece provided by an embodiment of the present application;

[0043] Figure 7 is a structural schematic view of a force applying mechanism provided by an embodiment of the present application.

[0044] Reference signs:

[0045] 10, frame body; 110, machine body; 120, top plate; 130, bottom plate; 140, foot pad; 160, handle; 170, fixing frame;

[0046] 20, first test piece; 210, first rolling track; 220, first ball clamping block; 230, second ball clamping block; 240, first oil outlet hole; 250, first pin hole; 260, temperature sensor mounting hole; 270, ball; 280, cylindrical pin;

[0047] 30, second test piece; 310, second rolling track; 320, second oil outlet hole; 330, second pin hole; 340, screw plug;

[0048] 40, first fixing mechanism; 410, first sliding table; 420, second sliding table; 430, third sliding table; 440, locking screw; 450, screw micrometer head; 460, connecting piece;

[0049] 50, second fixing mechanism; 510, fixing disc; 520, bearing seat; 530, flange; 540, oil blocking paper groove;

[0050] 60, force applying mechanism; 610, wedge-shaped transmission assembly; 620, first transmission rod; 630, second transmission rod; 640, fastening assembly; 611, wedge-shaped movable block; 612, movable guide seat; 613, screw rod; 614, nut; 615, spring; 641, fastening screw; 621, optical axis; 622, linear bearing; 623, bearing body mounting seat; 6111, base; 6411, screw seat;

[0051] 70, rotation driving mechanism; 710, servo motor; 720, speed reducer; 730, coupling; 740, driving shaft; 750, base;

[0052] 810, torque sensor; 820, first pressure sensor; 830, second pressure sensor. DETAILED DESCRIPTION

[0053] The embodiments of the present application will be further described below with reference to the drawings and examples. The following examples are used to illustrate the present application, but cannot be used to limit the scope of the present application.

[0054] In the description of the embodiments of the present application, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only used to facilitate the description of the embodiments of the present application and simplify the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the embodiments of the present application. In addition, the terms "first", "second", "third" are only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0055] In the description of the embodiments of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "connected", "connected" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0056] In the embodiments of the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature, which can be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be that the first feature is directly above or obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature can be that the first feature is directly below or obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0057] In the description of the present specification, the description referring to the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the embodiments of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Also, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, the person skilled in the art can combine and combine the different embodiments or examples described in the present specification and the features of the different embodiments or examples, without contradiction.

[0058] As shown in Figures 1 to 7 The embodiment of the present application provides a ball screw pair friction and wear mechanism test device, which comprises a frame body 10, a first test piece 20, a second test piece 30, a first fixing mechanism 40, a second fixing mechanism 50, a force applying mechanism 60, a rotary driving mechanism 70 and a force monitoring mechanism. The first test piece 20 is provided with a first raceway 210; the second test piece 30 is provided with a second raceway 310, and the second raceway 310 is a plane raceway; the first test piece 20 and the second test piece 30 are oppositely arranged, and the first raceway 210 and the second raceway 310 jointly form a cavity suitable for accommodating a ball 270; the first fixing mechanism 40 is arranged on the frame body 10, and the first test piece 20 is installed on the first fixing mechanism 40; the second fixing mechanism 50 is arranged on the frame body 10, and the second test piece 30 is installed on the second fixing mechanism 50; the force applying mechanism 60 is arranged on the frame body 10, and the force applying mechanism 60 is connected with the first test piece 20 and is suitable for applying a load to the first test piece 20; the rotary driving mechanism 70 is arranged on the frame body 10, and the rotary driving mechanism 70 is connected with the second test piece 30 and is suitable for driving the second test piece 30 to rotate relative to the first test piece 20; the force monitoring mechanism is electrically connected with the force applying mechanism 60 and the rotary driving mechanism 70, is suitable for collecting load information applied by the force applying mechanism 60 to the first test piece 20 and driving force information applied by the rotary driving mechanism 70 to the second test piece 30; and the direction of the load applied by the force applying mechanism 60 to the first test piece 20 is perpendicular to the direction of the rotation axis of the second test piece 30.

[0059] The frame body 10, i.e. the support structure of the ball screw friction and wear mechanism test device, provides a support platform for installing a series of test related components. In the embodiment of the present application, the first test piece 20 can be equivalent to the nut structure in the traditional ball screw structure, and the second test piece 30 can be equivalent to the screw structure in the traditional ball screw structure. In the test device provided in the embodiment, the contact state of the ball 270 in the ball screw and the screw raceway is equivalent to be replaced, the helical raceway of the screw and the nut is replaced by a planar annular raceway, and then the structural parameters corresponding to the expansion of the screw raceway into a planar raceway are calculated according to the contact state of the ball 270 and the screw raceway. The first test piece 20 and the second test piece 30 are oppositely arranged, the first test piece 20 remains stationary, and the second test piece 30 rotates relative to the first test piece 20, and the force applying mechanism 60 applies a load to the first test piece 20 in a direction perpendicular to the rotation axis of the second test piece 30, and the size of the load can be adjusted.

[0060] According to the ball screw friction and wear mechanism test device provided in the embodiment of the present application, the contact state of the ball 270 in the ball screw and the screw raceway is equivalent to be replaced to obtain the dynamic state of the ball 270 and the related friction and wear mechanism parameters under different working conditions. Specifically, the first test piece 20 is provided with a first raceway 210, and the second test piece 30 is provided with a second raceway 310, wherein the second raceway 310 is a planar raceway, the first test piece 20 and the second test piece 30 are oppositely arranged, the first raceway 210 and the second raceway 310 are overlapped to form a cavity, the ball 270 is placed in the cavity, the first test piece 20 is fixed by the first fixing mechanism 40, and the second test piece 30 is fixed by the second fixing mechanism 50. Then the force applying mechanism 60 applies a Y-direction load to the first test piece 20, and the rotary driving mechanism 70 applies a rotary driving force to the second test piece 30 to drive the second test piece 30 to rotate relative to the first test piece 20, and the ball 270 rolls in the cavity formed by the first raceway 210 and the second raceway 310. Under the action of different load forces, the contact force between the ball 270 and the first raceway 210 and the second raceway 310 will change, and the size of the load force, the rotary driving force, the rotary torque, the friction torque and other information can be obtained by the force monitoring mechanism, so that the friction and wear characteristics of the ball screw under different working conditions can be further studied. The frame body 10 can provide necessary support for the above related structures. By using the ball screw friction and wear mechanism test device provided in the present application, the relationship between the friction torque and the related parameters under different working conditions can be obtained, which provides better theoretical and technical support for studying the friction and wear mechanism of the ball screw.

[0061] In addition, the application adopts the structure of a flat raceway, and equivalently replaces the screw / nut screw helical raceway, so that the test device and the dynamics and contact mechanics state of the ball 270 in the ball screw pair are consistent under different working conditions, and the correctness of the ball screw pair friction and wear mechanism research can be ensured. The overall size of the ball screw pair can also be simplified, so that the ball screw pair friction and wear mechanism test device has small floor area, low cost and is easy to maintain, and the test efficiency is further improved.

[0062] The force monitoring mechanism can monitor parameters such as pre-tightening force, load force and friction torque in real time, without disassembling the pre-tightening structure related to the first test piece 20 and the second test piece 30, and the operation is convenient, time-saving, and assembly errors caused by multiple disassembling and assembling are avoided.

[0063] As shown in Figure 2 , Figure 4 , Figure 5 and Figure 7 , in the embodiment of the application, the first fixing mechanism 40 includes a first sliding table 410, a second sliding table 420 and a third sliding table 430 connected in sequence, the first sliding table 410 is adapted to reciprocate along the X direction, the second sliding table 420 is adapted to reciprocate along the Z direction, the third sliding table 430 is adapted to reciprocate along the Y direction, and the first test piece 20 is installed on the third sliding table 430; the second fixing mechanism 50 includes a fixed disc 510 and a bearing seat 520, the fixed disc 510 is installed on the frame 10 through the bearing seat 520, and the second test piece 30 is installed on the fixed disc 510; the force applying mechanism 60 includes a wedge-shaped transmission assembly 610, a first transmission rod 620, a second transmission rod 630 and a clamping assembly 640, one end of the first transmission rod 620 is connected with the first test piece 20, the other end of the first transmission rod 620 is connected with the wedge-shaped transmission assembly 610, one end of the second transmission rod 630 is connected with the first test piece 20, the other end of the second transmission rod 630 is connected with the clamping assembly 640, and the first transmission rod 620 and the second transmission rod 630 are arranged on opposite sides of the first test piece 20; the rotary driving mechanism 70 includes a servo motor 710, a speed reducer 720, a shaft coupling 730 and a driving shaft 740 connected in sequence, and the driving shaft 740 penetrates the bearing seat 520 and is connected with the fixed disc 510.

[0064] The connecting piece 460 can be arranged on the third sliding table 430, and the first test piece 20 is arranged on the connecting piece 460. The first fixing mechanism 40 can not only fix the first test piece 20, but also adjust the position of the first test piece 20. The first sliding table 410 can drive the second sliding table 420 and the third sliding table 430 to move along the X direction. After the position along the X direction is adjusted, the second sliding table 420 can drive the third sliding table 430 to move along the Z direction. After the position along the Z direction is adjusted, the third sliding table 430 can drive the first test piece 20 to move along the Y direction. After the adjustment along the X direction and the Z direction, the first sliding table 410 and the second sliding table 420 are fixed by the locking screw 440, and the third sliding table 430 is in a free state along the Y direction. The accuracy of the positioning of the first test piece 20 can be ensured, the force applying mechanism 60 can apply a load along the Y direction and perpendicular to the rotation axis of the second test piece 30 to the first test piece 20 at a certain height along the Z direction, and the test precision and the accuracy of the test result can be improved.

[0065] In order to better ensure the assembly precision of the first test piece 20, the screw micrometer head 450 can be arranged, and the height of the second sliding table 420 is adjusted upward or downward by rotating the screw micrometer head 450. For example, the distance between the first test piece 20 and the second test piece 30 is 1 mm, which can be ensured by the plug gauge, and the locking screw 440 of the second sliding table 420 is tightened.

[0066] The fixing disc 510 is directly connected with the driving shaft 740 in the rotation driving mechanism 70, the second test piece 30 is arranged on the fixing disc 510, the driving shaft 740 drives the fixing disc 510 to rotate when the driving shaft 740 rotates, and the fixing disc 510 drives the second test piece 30 to rotate. The bearing seat 520 is arranged between the driving shaft 740 and the fixing disc 510, and the driving shaft 740 is arranged in the bearing seat 520, so that the stability of the driving shaft 740 can be improved, and the power transmission can be ensured to be reliable.

[0067] The wedge transmission assembly 610 in the force applying mechanism 60 can output varying force, which is determined by the structure of the wedge transmission assembly 610. The force output by the wedge transmission assembly 610 is transmitted to one side of the first test piece 20 through the first transmission rod 620. The fastening assembly 640 and the second transmission rod 630 are located on the other side of the first test piece 20. The second transmission rod 630 abuts against the other side of the first test piece 20. The fastening assembly 640 can exert a pre-tightening force to fix the second transmission rod 630. In this way, the force exerted by the first transmission rod 620 on the first test piece 20 is opposite to the force exerted by the second transmission rod 630 on the first test piece 20. The difference between the two forces is the pre-tightening force or loading force exerted on the first test piece 20. This design can enhance the rigidity of the force applying mechanism 60. The fastening assembly 640 can be provided with a fastening screw 641 and a screw seat 6411. The fastening screw 641 is arranged on the screw seat 6411. The pre-tightening force exerted on the second transmission rod 630 can be adjusted through the fastening screw 641.

[0068] The servo motor 710 in the rotary drive mechanism 70 can output power. The rotary motion is transmitted to the fixed disc 510 provided with the second test piece 30 through the speed reducer 720, the shaft coupling 730 and the drive shaft 740. The speed reducer 720 can be a right-angle speed reducer 720. Multiple shaft couplings 730 can be provided to further ensure the reliability of power output.

[0069] As shown in FIGS. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14 and 15, in the embodiment of the present application, the force monitoring mechanism includes a torque sensor 810, a first pressure sensor 820 and a second pressure sensor 830. The torque sensor 810 is arranged on the base 750 of the speed reducer 720. The first pressure sensor 820 is arranged on the first transmission rod 620. The second pressure sensor 830 is arranged on the second transmission rod 630. Figure 4 and Figure 7 The torque sensor 810 can monitor and acquire the friction torque parameter between the rolling ball 270 and the first raceway 210 and the second raceway 310 when the rolling ball 270 rolls. The first pressure sensor 820 can monitor and acquire the force exerted by the wedge transmission assembly 610 on the first test piece 20. The second pressure sensor 830 can monitor and acquire the reverse force exerted by the second transmission rod 630 on the first test piece 20.

[0070] Further, the first transmission rod 620 can be provided with a light axis 621 structure. When the movable block in the wedge transmission assembly 610 moves, the movable block and the light axis 621 can compress or release the first pressure sensor 820. Similarly, the second pressure sensor 830 can be compressed or released by rotating the fastening member in the fastening assembly 640.

[0071] A linear bearing 622 can also be provided on the first transmission rod 620, and a bearing housing mounting seat 623 can be provided. The linear bearing 622 is installed on the bearing housing mounting seat 623, and the first transmission rod 620 is sleeved on the linear bearing 622 to ensure the stability of the applied load.

[0072] like Figure 7 As shown, in an embodiment of the present invention, the wedge-shaped transmission assembly 610 includes a wedge-shaped movable block 611, a movable guide seat 612, a screw 613, a nut 614, and a spring 615. The transmission assembly is connected to the first transmission rod 620 through the wedge-shaped movable block 611. The wedge-shaped movable block 611 and the movable guide seat 612 are slidably connected. The screw 613 passes through the wedge-shaped movable block 611, one end of the screw 613 is connected to the movable guide seat 612, and the nut 614 is disposed at the other end of the screw 613. The spring 615 is sleeved on the screw 613, one end of the spring 615 abuts against the wedge-shaped movable block 611, and the other end of the spring 615 abuts against the movable guide seat 612. The wedge-shaped movable block 611 can reciprocate along the groove of the movable guide seat 612. Due to the structural characteristic that the two ends of the wedge-shaped movable block 611 are of different sizes, the surface that abuts against the first transmission rod 620 is an inclined surface. When the wedge-shaped movable block 611 moves, it can achieve the effect of squeezing or releasing the first transmission rod 620, thereby applying different magnitudes of force to the first specimen 20. The screw 613 passes through the wedge-shaped movable block 611. The movement stroke of the wedge-shaped movable block 611 can be controlled by adjusting the nut 614 at the end of the screw 613. The spring 615 can adjust the corresponding extension and contraction state based on the position of the wedge-shaped movable block 611 to compensate for the fixed wedge-shaped movable block 611. A base 6111 can be provided at the bottom of the movable guide seat 612 to enhance the stability of the wedge-shaped transmission assembly 610.

[0073] like Figure 1As shown, in an embodiment of the present invention, the frame 10 includes a body 110, a top plate 120, and a bottom plate 130, with the top plate 120 and bottom plate 130 disposed on opposite sides of the body 110; the first fixing mechanism 40, the second fixing mechanism 50, and the force-applying mechanism 60 are all mounted on the top plate 120, and the rotation drive mechanism 70 is mounted on the bottom plate 130. The body 110 has a square frame structure, with the top plate 120 covering the upper part of the body 110 and the bottom plate 130 located at the lower part of the body 110. The first fixing mechanism 40 and the second fixing mechanism 50 are mounted on the top plate 120, and the first fixing mechanism 40 and the second fixing mechanism 50 are arranged vertically, so that the first test piece 20 and the second test piece 30 can also be combined vertically. The force-applying mechanism 60 is also mounted on the top plate 120 and is located to the side of the first fixing mechanism 40 and the second fixing mechanism 50. The rotary drive mechanism 70 is mounted on the bottom plate 130. The transmission device in the rotary drive mechanism 70 can pass through the top plate 120 to transmit the driving force to the second specimen 30. A fixing frame 170 can be provided on the top plate 120, and the first fixing mechanism 40 can be mounted on the fixing frame 170.

[0074] like Figure 3 As shown in the embodiment of the present invention, a first ball clamping block 220 and a second ball clamping block 230 are provided on the first test piece 20, and the first ball clamping block 220 and the second ball clamping block 230 are disposed on both sides of the first raceway 210. The first ball clamping block 220 and the second ball clamping block 230 can limit the movement of the ball 270, preventing the ball 270 from dislodging from the first raceway 210 during rolling.

[0075] like Figure 3As shown in the embodiment of the present invention, the first test piece 20 is provided with a first oil outlet 240 and a first pin hole 250, and the second test piece 30 is provided with a second pin hole 330; the fixed plate 510 is provided with a second oil outlet 320. Lubricating oil can be supplied to the raceway structure through the first oil outlet 240 to make the rolling of the ball 270 smoother and more stable. Different amounts of lubricating oil released from the first oil outlet 240 can achieve different lubrication states. Lubricating oil in the fixed plate 510 can be released through the second oil outlet 320. In the non-drainage state, a screw plug 340 can be provided to seal the second oil outlet 320. The fixed plate 510 may be provided with a flange 530 to prevent lubricating oil from being thrown out, and an oil-blocking paper groove 540 may be provided at the edge of the second raceway 310 to insert oil-blocking paper to prevent lubricating oil leakage. The first pin hole 250 and the second pin hole 330 are positioning structures used for assembling the first test piece 20 and the second test piece 30. During assembly, the cylindrical pin 280 can be installed in the second pin hole 330 of the second test piece 30. Then, by adjusting the first slide 410, the second slide 420, and the third slide 430, the other end of the cylindrical pin 280 is installed in the first pin hole 250 of the first test piece 20. The first slide 410 is fixed to ensure that the direction of the load applied by the force application mechanism 60 to the first test piece 20 is perpendicular to the direction of the rotation axis of the second test piece 30. After that, the cylindrical pin 280 is removed, and the ball 270 is placed into the cavity formed by the first raceway 210 and the second raceway 310. The required load is then applied to start the test.

[0076] like Figure 3 As shown, in an embodiment of the present invention, a temperature sensor mounting hole 260 is provided on the first test piece 20. Because the ball bearing 270 generates a large amount of heat due to high-speed friction with the first raceway 210 and the second raceway 310 during rolling, the temperature of the ball bearing 270 during rolling can be monitored in real time by providing a temperature sensor, preventing excessively high temperatures from affecting the first test piece 20 and the second test piece 30 and thus leading to inaccurate test results.

[0077] like Figure 1 and Figure 4 As shown in the embodiment of the present invention, the ball screw pair friction and wear mechanism testing device further includes foot pads 140, which are disposed at the bottom of the frame 10. The foot pads 140 can provide a certain buffering effect on the frame 10. During device operation, vibrations are generated; by buffering the vibration force with the foot pads 140, the stability of the frame 10 can be ensured, reducing the impact of vibration on the testing process. Foot pads 140 can be respectively disposed at the four corners of the base plate 130 of the frame 10.

[0078] like Figure 1 and Figure 4As shown, in the embodiment of the present application, the ball screw pair friction and wear mechanism test device further comprises a handle 160, which is arranged on the bottom plate 130, and the experimenter can move the test table through the handle 160.

[0079] Finally, it should be noted that: the above examples are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing examples, or make equivalent replacement for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A test device for the friction and wear mechanism of a ball screw pair, characterized in that, include: Frame (10); The first test piece (20) is provided with a first raceway (210); The second specimen (30) is provided with a second raceway (310), which is an annular planar raceway; The first test piece (20) and the second test piece (30) are arranged opposite to each other, and the first raceway (210) and the second raceway (310) together form a cavity suitable for accommodating the ball (270); The first fixing mechanism (40) is disposed on the frame (10), and the first test piece (20) is installed on the first fixing mechanism (40); The second fixing mechanism (50) is disposed on the frame (10), and the second specimen (30) is installed on the second fixing mechanism (50); A force-applying mechanism (60) is disposed on the frame (10) and connected to the first specimen (20), and is adapted to apply a load to the first specimen (20); A rotary drive mechanism (70) is disposed on the frame (10) and connected to the second specimen (30), which is adapted to drive the second specimen (30) to rotate relative to the first specimen (20); A force monitoring mechanism is electrically connected to the force application mechanism (60) and the rotary drive mechanism (70), and is adapted to collect the load information applied by the force application mechanism (60) to the first specimen (20) and the driving force information applied by the rotary drive mechanism (70) to the second specimen (30); The direction of the load applied by the force-applying mechanism (60) to the first specimen (20) is perpendicular to the direction of the rotation axis of the second specimen (30).

2. The ball screw pair friction and wear mechanism test device according to claim 1, characterized in that, The first fixing mechanism (40) includes a first slide (410), a second slide (420) and a third slide (430) connected in sequence. The first slide (410) is adapted to reciprocate along the X direction, the second slide (420) is adapted to reciprocate along the Z direction, and the third slide (430) is adapted to reciprocate along the Y direction. The first specimen (20) is mounted on the third slide (430). The second fixing mechanism (50) includes a fixing plate (510) and a bearing seat (520). The fixing plate (510) is mounted on the frame (10) through the bearing seat (520), and the second test piece (30) is mounted on the fixing plate (510). The force application mechanism (60) includes a wedge-shaped transmission assembly (610), a first transmission rod (620), a second transmission rod (630), and a locking assembly (640). One end of the first transmission rod (620) is connected to the first specimen (20), and the other end of the first transmission rod (620) is connected to the wedge-shaped transmission assembly (610). One end of the second transmission rod (630) is connected to the first specimen (20), and the other end of the second transmission rod (630) is connected to the locking assembly (640). The first transmission rod (620) and the second transmission rod (630) are arranged on opposite sides of the first specimen (20). The rotary drive mechanism (70) includes a servo motor (710), a reducer (720), a coupling (730), and a drive shaft (740) connected in sequence. The drive shaft (740) passes through the bearing seat (520) and is connected to the fixed disk (510).

3. The ball screw pair friction and wear mechanism test device according to claim 2, characterized in that, The force monitoring mechanism includes a torque sensor (810), a first pressure sensor (820), and a second pressure sensor (830). The torque sensor (810) is mounted on the base (750) of the reducer (720), the first pressure sensor (820) is mounted on the first transmission rod (620), and the second pressure sensor (830) is mounted on the second transmission rod (630).

4. The ball screw pair friction and wear mechanism test device according to claim 2, characterized in that, The wedge-shaped transmission assembly (610) includes a wedge-shaped movable block (611), a movable guide seat (612), a screw (613), a nut (614), and a spring (615). The transmission assembly is connected to the first transmission rod (620) through the wedge-shaped movable block (611). The wedge-shaped movable block (611) is slidably connected to the movable guide seat (612), the screw (613) passes through the wedge-shaped movable block (611), one end of the screw (613) is connected to the movable guide seat (612), and the nut (614) is disposed at the other end of the screw (613). The spring (615) is sleeved on the screw (613), one end of the spring (615) abuts against the wedge-shaped movable block (611), and the other end of the spring (615) abuts against the movable guide seat (612).

5. The ball screw pair friction and wear mechanism test apparatus according to any one of claims 1-4, characterized in that, The frame (10) includes a body (110), a top plate (120) and a bottom plate (130), with the top plate (120) and the bottom plate (130) located on opposite sides of the body (110); The first fixing mechanism (40), the second fixing mechanism (50) and the force application mechanism (60) are all mounted on the top plate (120), and the rotation drive mechanism (70) is mounted on the bottom plate (130).

6. The ball screw pair friction and wear mechanism test apparatus according to any one of claims 1-4, characterized in that, The first test piece (20) is provided with a first ball clamp (220) and a second ball clamp (230), which are located on both sides of the first raceway (210).

7. The ball screw pair friction and wear mechanism test apparatus according to any one of claims 2-4, characterized in that, The first test piece (20) is provided with a first oil outlet hole (240) and a first pin hole (250), and the second test piece (30) is provided with a second pin hole (330); The fixed plate (510) is provided with a second oil outlet (320).

8. The ball screw pair friction and wear mechanism test apparatus according to any one of claims 1-4, characterized in that, The first specimen (20) is provided with a temperature sensor mounting hole (260).

9. The ball screw pair friction and wear mechanism test apparatus according to any one of claims 1-4, characterized in that, The ball screw pair friction and wear mechanism test device also includes a foot pad (140), which is located at the bottom of the frame (10).

10. The ball screw pair friction and wear mechanism test device according to claim 5, characterized in that, The ball screw pair friction and wear mechanism test device also includes a handle (160), which is disposed on the base plate (130).

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