Smooth detection system and detection method

Abstract

The invention relates to a smoothness detection system and a detection method. The smoothness detection system comprises a workbench; the friction transmission mechanism can drive the screw rod to rotate through friction transmission; a position detection mechanism; the processor is in communication connection with the position detection mechanism and the friction transmission mechanism, and the processor can obtain the actual displacement of the sliding block in the test period; wherein the rotating torque of the screw rod of the screw rod sliding block assembly under the lowest smoothness requirement is defined as the reference torque, the torque transmitted to the screw rod by the friction transmission mechanism through friction transmission is defined as the friction transmission torque, and the friction transmission torque is configured to be equal to the reference torque; displacement generated when the power of the friction transmission mechanism is completely transmitted to the screw rod through friction transmission in the testing period to drive the sliding block to move is defined as theoretical displacement, and the processor is used for judging the size relation between the actual displacement and the theoretical displacement. The method has the advantages of being simple in testing and stable and reliable in testing result.

Description

Technical Field

[0001] The present application relates to the technical field of detection equipment, and in particular to a smoothness detection system and detection method. Background Art

[0002] The screw-slider assembly is a spiral transmission structure, which mainly includes a base, a screw rotatably connected to the base, and a slider slidably connected to the base and cooperating with the screw thread. It can convert the rotation of the screw into linear motion of the slider, and is therefore often used in conjunction with a motor to form a linear drive module; at the same time, while converting the form of motion, the rotation of the screw is also converted into the displacement of the slider, and the displacement is easier to limit or detect than the rotation, so the screw-slider assembly is also used to record the rotation of some rotating parts.

[0003] Among them, the smoothness of the normal operation process of the screw slider assembly is a more critical functional manifestation. It is usually necessary to perform a smoothness test on the assembled screw slider assembly. However, most of the current methods use manual testing, and the test results are unstable. Summary of the invention

[0004] One of the purposes of the present application is to provide a smoothness detection system, which is simple to test for smoothness and has stable and reliable test results.

[0005] The second purpose of the present application is to provide a smoothness detection method, which can reflect whether the smoothness of the screw slider assembly during operation meets the requirements by judging the size of the theoretical displacement and the actual displacement of the slider during the test, and the test results are stable and reliable.

[0006] One of the purposes of this application is to adopt the following technical solution:

[0007] A smoothness detection system, comprising:

[0008] A workbench is provided with an inspection station for placing a screw slider assembly, wherein the screw slider assembly includes a screw, a slider and a base;

[0009] A friction transmission mechanism capable of driving the screw to rotate through friction transmission;

[0010] A position detection mechanism, used for detecting the position of the slider;

[0011] a processor, communicatively connected to the position detection mechanism and the friction transmission mechanism, the processor being capable of obtaining an actual displacement of the slider during a test;

[0012] Among them, the torque of the screw rotation under the minimum smoothness requirement of the screw slider assembly is defined as the reference torque, the torque transmitted to the screw by the friction transmission mechanism through friction transmission is defined as the friction transmission torque, and the friction transmission torque is configured to be equal to the reference torque; the displacement generated by the power of the friction transmission mechanism being completely transmitted to the screw through friction transmission during the test and driving the slider to move is defined as the theoretical displacement, and the processor is used to determine the size relationship between the actual displacement and the theoretical displacement.

[0013] By adopting the above technical solution, the friction transmission mechanism drives the screw to rotate by friction transmission. When the friction transmission is normally transmitted, the displacement of the slider is the theoretical displacement, and the displacement of the slider detected by the position detection mechanism is the actual displacement. By judging the size of the theoretical displacement and the actual displacement, it can be reflected whether the smoothness of the screw slider assembly during operation meets the requirements. The test is simple and the test results are stable and reliable. Specifically, if the screw slider assembly meets the minimum smoothness requirements, the power of the friction transmission mechanism can be fully transmitted to the screw, and correspondingly, the actual displacement of the slider will be equal to the theoretical displacement; if the screw slider assembly does not meet the minimum smoothness requirements, the friction transmission between the friction transmission mechanism and the screw will slip, and at this time, the power of the friction transmission mechanism will not be fully transmitted to the screw, and correspondingly, the actual displacement of the slider will be less than the theoretical displacement.

[0014] Furthermore, the smoothness detection system also includes a displacement drive mechanism, which is used to drive the friction transmission mechanism to move between a transmission position and a standby position relative to the detection station; when the friction transmission mechanism is in the transmission position, the friction transmission mechanism can drive the screw to rotate through friction transmission, and in the transmission position, the friction transmission torque is equal to the reference torque; when the friction transmission mechanism is in the standby position, there is a distance between the friction transmission mechanism and the screw.

[0015] Furthermore, the displacement driving mechanism includes a driving module, a movable seat and an elastic pressure piece, the driving module is used to drive the movable seat to move, the friction transmission mechanism is slidably arranged on the movable seat, the elastic pressure piece is arranged between the friction transmission mechanism and the movable seat, and when the friction transmission mechanism is in the transmission position, the elastic pressure piece is used to provide pressure for the friction transmission mechanism to press against the screw.

[0016] Furthermore, the displacement driving mechanism also includes an elastic force adjusting member, and the elastic force adjusting member is used to adjust the elastic force applied by the elastic pressure member to the friction transmission mechanism.

[0017] Furthermore, the position of the elastic force adjustment member can be adjusted along a first direction relative to the movable seat, and the first direction is parallel to the relative sliding direction of the friction transmission mechanism and the movable seat; the elastic pressure member includes a first end and a second end opposite to each other, the first end cooperates with the pressure adjustment member, and the second end cooperates with the friction transmission mechanism.

[0018] Furthermore, the friction transmission mechanism includes a friction wheel and a driving member, wherein the driving member is used to drive the friction wheel to rotate, and the friction wheel abuts against the screw and drives the screw to rotate through friction transmission.

[0019] Furthermore, the position detection mechanism includes an image acquirer, which is used to acquire the relative position of the slider in the screw slider assembly, and the image acquirer is electrically connected to the processor.

[0020] Furthermore, the position detection mechanism also includes a reflector arranged at an angle of 45° relative to a horizontal plane, and the image of the screw slider assembly on the detection workstation is reflected by the reflector and then transmitted to the image acquirer.

[0021] The second purpose of this application adopts the following technical solution:

[0022] A smoothness detection method comprises the following steps:

[0023] Obtaining a theoretical displacement required for the slider to move from a first position to a preset second position in the screw slider assembly;

[0024] Based on the theoretical displacement, the theoretical rotation angle of the screw under the action of friction transmission is obtained;

[0025] Based on the theoretical rotation angle, a friction drive parameter of the friction transmission mechanism in the friction transmission process is obtained; wherein the friction transmission mechanism operates with the friction drive parameter and enables the screw to obtain the theoretical rotation angle when the power is fully transmitted to the screw;

[0026] A friction transmission mechanism is used to drive the screw to rotate with a friction drive parameter; wherein the torque of the screw rotation under the minimum smoothness requirement of the screw slider assembly is defined as a reference torque, and the torque transmitted to the screw by the friction transmission mechanism through friction transmission is defined as a friction transmission torque, and the friction transmission torque is configured to be equal to the reference torque;

[0027] Get the actual displacement of the slider during the test;

[0028] Compare the numerical values ​​of the theoretical displacement and the actual displacement; if the actual displacement is equal to the theoretical displacement, it means that the screw slider assembly meets the minimum smoothness requirement in the test; if the actual displacement is less than the theoretical displacement, it means that the screw slider assembly does not meet the minimum smoothness requirement in the test.

[0029] By adopting the above technical solution, the size of the theoretical displacement and the actual displacement of the slider during the test can be judged, which can reflect whether the smoothness of the screw slider assembly during operation meets the requirements. The test is simple and the test results are stable and reliable.

[0030] Furthermore, the friction driving parameters include driving speed and driving time.

[0031] In addition, the second purpose of this application can also adopt the following technical solution:

[0032] A smoothness detection method comprises the following steps:

[0033] Obtaining a first position of the slider in the screw slider assembly;

[0034] A friction transmission mechanism is used to drive the screw to rotate by friction transmission, and a theoretical displacement of the screw driven by the normal action of the friction transmission is obtained; wherein the torque of the screw rotation under the minimum smoothness requirement of the screw slider assembly is defined as a reference torque, and the torque transmitted to the screw by the friction transmission mechanism through friction transmission is defined as the friction transmission torque, and the friction transmission torque is configured to be equal to the reference torque;

[0035] Obtaining the second position of the slider in the screw slider assembly at this time;

[0036] Based on the first position and the second position, obtaining an actual displacement of the slider during the test;

[0037] Compare the numerical values ​​of the theoretical displacement and the actual displacement; if the actual displacement is equal to the theoretical displacement, it means that the screw slider assembly meets the minimum smoothness requirement in the test; if the actual displacement is less than the theoretical displacement, it means that the screw slider assembly does not meet the minimum smoothness requirement in the test.

[0038] In summary, this application at least includes the following beneficial effects:

[0039] By judging the size of the theoretical displacement and actual displacement of the slider during the test, it can be reflected whether the smoothness of the screw slider assembly during operation meets the requirements. The test is simple and the test results are stable and reliable. Specifically, if the screw slider assembly meets the minimum smoothness requirements, the power of the friction transmission mechanism can be fully transmitted to the screw, and correspondingly, the actual displacement of the slider will be equal to the theoretical displacement; if the screw slider assembly does not meet the minimum smoothness requirements, the friction transmission between the friction transmission mechanism and the screw will slip, and the power of the friction transmission mechanism will not be fully transmitted to the screw, and correspondingly, the actual displacement of the slider will be less than the theoretical displacement. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 is a schematic diagram of a friction transmission mechanism in a smoothness detection system in an embodiment of the present application in a transmission position;

[0041] Figure 2 is a schematic diagram of a screw slider assembly in an embodiment of the present application;

[0042] Figure 3 yes Figure 1 A schematic diagram of the enlarged structure of part A;

[0043] Figure 4 is a schematic diagram showing a friction transmission mechanism and a displacement drive mechanism in an embodiment of the present application;

[0044] Figure 5 is a schematic diagram of a friction transmission mechanism in a smoothness detection system in an embodiment of the present application in a standby position;

[0045] Figure 6 It is a schematic diagram of the hidden friction transmission mechanism in the embodiment of the present application for displaying the elastic pressure member and the elastic force adjustment member.

[0046] Explanation of the accompanying drawings: 1. workbench; 11. detection station; 2. friction transmission mechanism; 21. friction wheel; 22. driving member; 3. position detection mechanism; 31. image acquisition device; 32. reflector; 33. light source; 4. displacement drive mechanism; 41. driving module; 42. movable seat; 43. elastic pressure member; 44. elastic force adjustment member; 441. waist-shaped hole; 442. accommodating hole; 5. screw slider assembly; 51. base; 52. screw; 521. gear; 53. slider. DETAILED DESCRIPTION

[0047] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0048] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0049] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0050] The screw slider assembly is a spiral transmission structure, which mainly includes a base, a screw rotatably connected to the base, and a slider slidably connected to the base and matched with the screw thread. It can convert the rotation of the screw into the linear motion of the slider, so it is often used to cooperate with the motor to form a linear drive module; at the same time, while converting the form of motion, the rotation of the screw is also converted into the displacement of the slider, and the displacement is easier to limit or detect than the rotation, so the screw slider assembly is also used to record the rotation of some rotating parts. The smoothness of the normal operation process of the screw slider assembly is a key functional manifestation. It is usually necessary to perform a smoothness test on the assembled screw slider assembly. However, most of the current methods use manual testing, and the test results are unstable.

[0051] The embodiment of the present application discloses a smoothness detection system, which can reflect whether the smoothness of the screw slider assembly 5 during operation meets the requirements by judging the size of the theoretical displacement and the actual displacement of the slider 53 during the test. The test is simple and the test results are stable and reliable.

[0052] Reference Figure 1 and Figure 2 The smoothness detection system includes a workbench 1, a friction transmission mechanism 2, a position detection mechanism 3 and a processor, wherein the workbench 1 is provided with a detection station 11 for stably placing the screw slider assembly 5. Figure 2 A screw slider assembly 5 is shown, which includes a base 51, a screw 52 rotatably connected to the base 51, and a slider 53 slidably connected to the base 51 and threadedly engaged with the screw 52. The inspection station 11 of the workbench 1 is used to position the base 51, so as to achieve the purpose of stably placing the screw slider assembly 5.

[0053] Combination Figure 1 and Figure 3 The friction transmission mechanism 2 can drive the screw 52 to rotate by friction transmission, and drive the slider 53 to move by the rotation of the screw 52; at the same time, the friction transmission mechanism 2 is also connected to the processor in communication, so that the processor can know or control the driving parameters of the friction transmission mechanism 2 during the driving of the screw 52. In some specific embodiments, the driving parameters of the friction transmission mechanism 2 include driving speed and driving time. The position detection mechanism 3 is used to detect the position of the slider 53, and the position detection mechanism 3 is connected to the processor in communication so that the position data detected by the position detection mechanism 3 before and after the test can be transmitted to the processor, so that the processor can obtain the actual displacement of the slider 53 during the test.

[0054] At the same time, during the test, the power of the friction transmission mechanism 2 is completely transmitted to the screw 52 through friction transmission to drive the slider 53 to move, which is defined as the theoretical displacement. The processor is used to determine the size of the actual displacement and the theoretical displacement.

[0055] In addition, the torque of the screw 52 rotating under the minimum smoothness requirement of the screw slider assembly 5 is defined as the reference torque, and the torque transmitted to the screw 52 by the friction transmission mechanism 2 through friction transmission is defined as the friction transmission torque, and the friction transmission torque is configured to be equal to the reference torque. Through such a configuration, if the screw slider assembly 5 meets the minimum smoothness requirement, the power of the friction transmission mechanism 2 can be completely transmitted to the screw 52 through friction transmission, and at this time, the actual displacement of the slider 53 is equal to the theoretical displacement; if the screw slider assembly 5 does not meet the minimum smoothness requirement, the friction transmission between the friction transmission mechanism 2 and the screw 52 will slip, and at this time, the power of the friction transmission mechanism 2 will not be completely transmitted to the screw 52, ​​and at this time, the actual displacement of the slider 53 is less than the theoretical displacement.

[0056] By adopting the above technology, by judging the size of the theoretical displacement and the actual displacement of the slider 53 during the test, it is possible to reflect whether the smoothness of the screw slider assembly 5 during operation meets the requirements. The test is simple and the test results are stable and reliable. Among them, when the actual displacement of the slider 53 is equal to the theoretical displacement, it indicates that the screw slider assembly 5 meets the minimum smoothness requirements. In some specific examples, the screw slider assembly 5 can be marked as "qualified"; when the actual displacement of the slider 53 is less than the theoretical displacement, it indicates that the screw slider assembly 5 does not meet the minimum smoothness requirements. In some specific examples, the screw slider assembly 5 can be marked as "unqualified". In addition, it can be understood that in theory, the actual displacement of the slider 53 will not be greater than the theoretical displacement. When the actual displacement of the slider 53 is greater than the theoretical displacement, an error is reported accordingly.

[0057] It should be noted that the minimum smoothness requirement refers to the minimum smoothness that can be allowed during the operation of the screw slider assembly 5. If the smoothness of the screw slider assembly 5 is further reduced, it is a component that does not meet the smoothness requirement; at the same time, when the minimum smoothness is met, as the smoothness decreases, the torque required for the screw 52 to rotate will gradually increase.

[0058] Reference Figure 1 In some embodiments, the workbench 1 is configured as a horizontally placed turntable, and the turntable can be connected to a driving motor that drives the turntable to rotate. Accordingly, the turntable is provided with a plurality of positioning structures for positioning screw slider assemblies 5, and the drive motor is driven to enable the turntable to transport the plurality of screw slider assemblies 5 positioned thereon to the inspection work one by one.

[0059] Reference Figure 1 , Figure 3 and Figure 4 In some embodiments, the friction transmission mechanism 2 includes a friction wheel 21 and a driving member 22. The driving member 22 can be a motor, and the output shaft of the motor is connected to the friction wheel 21 to drive the friction wheel 21 to rotate; at the same time, the circumferential outer wall of the friction wheel 21 is used to abut against the transmission abutment portion of the screw 52 and drive the screw 52 to rotate through friction transmission. In a specific embodiment, the transmission abutment portion of the screw 52 is the outer wall of the screw 52. In this case, the circumferential outer wall of the friction wheel 21 directly abuts against the outer wall of the screw 52; in some other embodiments, an annular structure is provided on the outer side of the screw 52 as a transmission abutment portion. In this case, the circumferential outer wall of the friction wheel 21 abuts against the annular structure of the screw 52. For details, please refer to Figure 2 A gear 521 is formed on the outer side of the screw 52. The gear 521 can be used as a transmission abutment portion of the screw 52 in some examples. Accordingly, the friction wheel 21 can abut against the gear 521 and drive the screw 52 to rotate through friction transmission.

[0060] Further, refer to Figure 1 and Figure 5 The smoothness detection system further includes a displacement drive mechanism 4, which is used to drive the friction transmission mechanism 2 to move between a transmission position and a standby position relative to the detection station 11; Figure 3 and Figure 4 When the friction transmission mechanism 2 is in the transmission position, the friction wheel 21 in the friction transmission mechanism 2 can abut against the transmission abutment portion of the screw 52, ​​so that the friction transmission mechanism 2 can drive the screw 52 to rotate through friction transmission, and the friction transmission torque is equal to the reference torque in the transmission position. At the same time, when the friction transmission mechanism 2 is in the standby position, there is a gap between the friction wheel 21 in the friction transmission mechanism 2 and the transmission abutment portion of the screw 52.

[0061] Reference Figure 4 and Figure 5 , the displacement drive mechanism 4 includes a drive module 41, a movable seat 42 and an elastic pressure member 43. The drive module 41 can be a screw linear module, which includes a guide rail, a slide, a screw and a motor. The motor drives the screw to rotate, thereby driving the slide to move linearly along the slide rail; accordingly, the movable seat 42 is installed on the slide of the screw linear module, so that the drive module 41 can drive the movable seat 42 to move in a direction close to or away from the detection station 11. For ease of expression, the movement direction of the friction transmission mechanism 2 between the transmission position and the standby position relative to the detection station 11 is referred to as the first direction. Accordingly, the movement direction of the movable seat 42 driven by the drive module 41 is parallel to the first direction. The friction transmission mechanism 2 is installed on the movable seat 42, and the movement of the movable seat 42 is driven by the drive module 41 to achieve the movement of the friction transmission mechanism 2 between the transmission position and the standby position. In addition, the friction transmission mechanism 2 and the movable seat 42 are slidably connected through the structure of the guide rail and the sliding seat, and the extension direction of the guide rail is parallel to the first direction, so that the sliding direction of the friction transmission mechanism 2 on the movable seat 42 is parallel to the first direction; and the elastic pressure member 43 is arranged between the friction transmission mechanism 2 and the movable seat 42. When the friction transmission mechanism 2 is in the transmission position, the elastic pressure member 43 is used to provide pressure for the friction wheel 21 of the friction transmission mechanism 2 to press against the transmission abutment part on the screw 52.

[0062] Furthermore, the displacement drive mechanism 4 further includes an elastic force adjustment member 44, and the position of the elastic force adjustment member 44 can be adjusted along the first direction relative to the movable seat 42; meanwhile, the elastic pressure member 43 is a linear spring extending along the first direction, and includes a first end and a second end opposite to each other along the first direction, the first end abuts against the pressure adjustment member, and the second end abuts against the friction transmission mechanism 2. Thus, the elastic force applied by the elastic pressure member 43 to the friction transmission mechanism 2 can be adjusted by adjusting the position of the elastic force adjustment member 44.

[0063] Reference Figure 4 and Figure 6 In some specific embodiments, the elastic adjusting member 44 is provided with a waist-shaped hole 441 extending in the first direction, and the elastic adjusting member 44 is connected to the movable seat 42 by bolts passing through the waist-shaped hole 441, so as to achieve position adjustment of the elastic adjusting member on the movable seat 42; at the same time, the elastic adjusting member 44 is provided with an accommodating hole 442 for accommodating the elastic pressure member 43 along the first direction, which to a certain extent avoids excessive deformation of the elastic pressure member 43 during the force compression process.

[0064] Further, refer to Figure 5 The position detection mechanism 3 includes an image acquisition device 31, a reflector 32 and a light source 33. The image acquisition device 31 is used to acquire the relative position of the slider 53 in the screw slider assembly 5, and the image acquisition device 31 is electrically connected to the processor. Figure 5 In some specific examples, the image acquirer 31 uses an industrial camera, and can obtain the image of the slider 53 in the screw slider assembly 5 by shooting, and based on the images at different times, the processor can obtain the displacement caused by the movement of the slider 53. At the same time, the reflector 32 is placed at an angle of 45°, and the screw slider assembly 5 of the detection station 11 is directly in front of the reflector 32, and the image acquirer 31 is directly above the reflector 32. In this case, the image of the screw slider assembly 5 on the detection station is reflected by the reflector 32 and transmitted to the image acquirer 31. In addition, the light source 33 is arranged on the side of the screw slider assembly 5 on the detection station away from the reflector 32, as the backlight of the screw slider assembly 5.

[0065] The present application also discloses a smoothness detection method, comprising the following steps:

[0066] S01. Obtaining a theoretical displacement required for a slider to move from a first position to a preset second position in a screw slider assembly.

[0067] S02. Based on the theoretical displacement, the theoretical rotation angle of the screw under the action of friction transmission is obtained.

[0068] It can be understood that the screw and the slider are threaded together. When the screw rotates one circle, the slider moves a corresponding displacement of one pitch. It can be seen that the rotation angle of the screw is positively correlated with the displacement of the slider; therefore, based on the actual pitch of the thread of the screw and the slider, the theoretical rotation angle of the screw can be calculated through the theoretical displacement of the slider.

[0069] S03. Based on the theoretical rotation angle, obtain the friction drive parameters of the friction transmission mechanism during the friction transmission process; wherein the friction transmission mechanism operates with the friction drive parameters and can enable the screw to obtain the theoretical rotation angle when the power is fully transmitted to the screw, and the friction drive parameters include the driving speed and the driving time.

[0070] It should be noted that the screw is driven to rotate by friction transmission. For the convenience of description, the component that directly applies friction force to the screw and drives the screw to rotate is defined as a friction part.

[0071] During the friction transmission process, the linear velocity and movement time of the part where the friction part and the screw abut each other are the same. V1 is defined as the linear velocity of the abutting part of the friction part against the screw, and V2 is defined as the linear velocity of the abutting part of the screw against the friction part. t1 is defined as the movement time of the abutting part of the friction part against the screw, and t2 is defined as the movement time of the abutting part of the screw against the friction part. The relationship is expressed as follows: V1=V2, t1=t2.

[0072] The product of the linear velocity and the movement time is the linear displacement of the abutment portion on the screw where the friction member abuts, and is also the linear displacement of the abutment portion on the friction member where the screw abuts. X1 is defined as the linear displacement of the abutment portion on the friction member where the screw abuts, and X2 is defined as the linear displacement of the abutment portion on the screw where the friction member abuts. The relationship is expressed as follows: X1=V1×t1, X2=V2×t2, and X1=X2 is obtained.

[0073] At the same time, the linear displacement of the abutment portion on the screw where the friction part abuts against each other is also equal to the product of the rotation radius and the rotation angle of the abutment portion. R2 is defined as the rotation radius of the abutment portion on the screw where the friction part abuts against each other, and θ2 is defined as the rotation angle of the abutment portion on the screw where the friction part abuts against each other. The rotation angle of the abutment portion on the screw where the friction part abuts against each other is equal to the rotation angle of the screw. The relationship is expressed as follows: X2=R2×θ2.

[0074] The above relationship can be used to obtain the relationship: V1×t1=R2×θ2; wherein R2 is an inherent parameter of the screw in the screw slider assembly. As one of the components in the screw slider assembly being tested, the rotation radius R2 of the abutment portion on the screw for the friction member to abut against is a constant. Based on the theoretical rotation angle of the screw, the product of the driving speed and driving time of the friction transmission mechanism during the friction transmission process can be calculated through the above relationship, and the driving speed and driving time can be determined accordingly.

[0075] S04. Use a friction transmission mechanism to drive the screw to rotate at the driving speed and driving time determined in step S03; wherein the torque of the screw rotation of the screw slider assembly under the minimum smoothness requirement is defined as a reference torque, and the torque transmitted to the screw by the friction transmission mechanism through friction transmission is defined as a friction transmission torque, and the friction transmission torque is configured to be equal to the reference torque.

[0076] S05. Obtain the actual displacement of the slider during the test.

[0077] Specifically, the actual displacement of the slider during the test can be calculated by obtaining the two positions of the slider before and after the test.

[0078] S06. Compare the numerical values ​​of theoretical displacement and actual displacement.

[0079] Among them, if the actual displacement is equal to the theoretical displacement, it means that the screw slider assembly meets the minimum smoothness requirement in the test; if the actual displacement is less than the theoretical displacement, it means that the screw slider assembly does not meet the minimum smoothness requirement in the test.

[0080] It should be noted that if the screw-slider assembly meets the minimum smoothness requirements, the power of the friction transmission mechanism can be fully transmitted to the screw through friction transmission, and the actual displacement of the slider is equal to the theoretical displacement; if the screw-slider assembly does not meet the minimum smoothness requirements, the friction transmission between the friction transmission mechanism and the screw will slip, and the power of the friction transmission mechanism will not be fully transmitted to the screw, and the actual displacement of the slider is less than the theoretical displacement.

[0081] Therefore, by judging the size of the theoretical displacement and the actual displacement of the slider during the test, it is possible to reflect whether the smoothness of the screw slider assembly during operation meets the requirements. The test is simple and the test results are stable and reliable. Among them, when the actual displacement of the slider is equal to the theoretical displacement, it indicates that the screw slider assembly meets the minimum smoothness requirements. In some specific examples, the screw slider assembly can be marked as "qualified"; when the actual displacement of the slider is less than the theoretical displacement, it indicates that the screw slider assembly does not meet the minimum smoothness requirements. In some specific examples, the screw slider assembly can be marked as "unqualified". In addition, it can be understood that in theory, the actual displacement of the slider will not be greater than the theoretical displacement. When the actual displacement of the slider is greater than the theoretical displacement, an error is reported accordingly.

[0082] The present application also discloses another smoothness detection method, comprising the following steps:

[0083] Obtaining a first position of the slider in the screw slider assembly;

[0084] A friction transmission mechanism is used to drive the screw to rotate by friction transmission, and a theoretical displacement of the screw driven by the normal action of the friction transmission is obtained; wherein the torque of the screw rotation under the minimum smoothness requirement of the screw slider assembly is defined as a reference torque, and the torque transmitted to the screw by the friction transmission mechanism through friction transmission is defined as the friction transmission torque, and the friction transmission torque is configured to be equal to the reference torque;

[0085] Obtaining the second position of the slider in the screw slider assembly at this time;

[0086] Based on the first position and the second position, obtaining an actual displacement of the slider during the test;

[0087] Compare the numerical values ​​of the theoretical displacement and the actual displacement; if the actual displacement is equal to the theoretical displacement, it means that the screw slider assembly meets the minimum smoothness requirement in the test; if the actual displacement is less than the theoretical displacement, it means that the screw slider assembly does not meet the minimum smoothness requirement in the test.

[0088] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A smoothness detection system, characterized in that: include: A workbench is provided with an inspection station for placing a screw slider assembly, wherein the screw slider assembly includes a screw, a slider and a base; A friction transmission mechanism capable of driving the screw to rotate through friction transmission; A position detection mechanism, used for detecting the position of the slider; a processor, communicatively connected to the position detection mechanism and the friction transmission mechanism, the processor being capable of obtaining an actual displacement of the slider during a test; Among them, the torque of the screw rotation under the minimum smoothness requirement of the screw slider assembly is defined as the reference torque, the torque transmitted to the screw by the friction transmission mechanism through friction transmission is defined as the friction transmission torque, and the friction transmission torque is configured to be equal to the reference torque; the displacement generated by the power of the friction transmission mechanism being completely transmitted to the screw through friction transmission during the test and driving the slider to move is defined as the theoretical displacement, and the processor is used to judge the size of the actual displacement and the theoretical displacement.

2. The smoothness detection system according to claim 1, characterized in that: The smoothness detection system also includes a displacement drive mechanism, which is used to drive the friction transmission mechanism to move between a transmission position and a standby position relative to the detection station; when the friction transmission mechanism is in the transmission position, the friction transmission mechanism can drive the screw to rotate through friction transmission, and in the transmission position, the friction transmission torque is equal to the reference torque; when the friction transmission mechanism is in the standby position, there is a distance between the friction transmission mechanism and the screw.

3. The smoothness detection system according to claim 2, characterized in that: The displacement driving mechanism includes a driving module, a movable seat and an elastic pressure member, the driving module is used to drive the movable seat to move, the friction transmission mechanism is slidably arranged on the movable seat, the elastic pressure member is arranged between the friction transmission mechanism and the movable seat, and when the friction transmission mechanism is in the transmission position, the elastic pressure member is used to provide pressure for the friction transmission mechanism to press against the screw.

4. The smoothness detection system according to claim 3, characterized in that: The displacement driving mechanism further comprises an elastic force adjusting member, and the elastic force adjusting member is used to adjust the elastic force applied by the elastic pressure member to the friction transmission mechanism.

5. The smoothness detection system according to claim 4, characterized in that: The position of the elastic force adjustment member can be adjusted along a first direction relative to the movable seat, and the first direction is parallel to the relative sliding direction of the friction transmission mechanism and the movable seat; the elastic pressure member includes a first end and a second end opposite to each other, the first end cooperates with the pressure adjustment member, and the second end cooperates with the friction transmission mechanism.

6. The smoothness detection system according to claim 1, characterized in that: The friction transmission mechanism comprises a friction wheel and a driving member, wherein the driving member is used to drive the friction wheel to rotate, and the friction wheel abuts against the screw rod and drives the screw rod to rotate through friction transmission.

7. The smoothness detection system according to claim 1, characterized in that: The position detection mechanism includes an image acquirer, which is used to acquire the relative position of the slider in the screw slider assembly, and the image acquirer is electrically connected to the processor.

8. The smoothness detection system according to claim 7, characterized in that: The position detection mechanism also includes a reflector arranged at an angle of 45° relative to a horizontal plane, and the image of the screw slider assembly on the detection work station is reflected by the reflector and then transmitted to the image acquirer.

9. A smoothness detection method, characterized in that: The following steps are involved: Obtaining a theoretical displacement required for the slider to move from a first position to a preset second position in the screw slider assembly; Based on the theoretical displacement, the theoretical rotation angle of the screw under the action of friction transmission is obtained; Based on the theoretical rotation angle, a friction drive parameter of the friction transmission mechanism in the friction transmission process is obtained; wherein the friction transmission mechanism operates with the friction drive parameter and enables the screw to obtain the theoretical rotation angle when the power is fully transmitted to the screw; A friction transmission mechanism is used to drive the screw to rotate with a friction drive parameter; wherein the torque of the screw rotation under the minimum smoothness requirement of the screw slider assembly is defined as a reference torque, and the torque transmitted to the screw by the friction transmission mechanism through friction transmission is defined as a friction transmission torque, and the friction transmission torque is configured to be equal to the reference torque; Get the actual displacement of the slider during the test; Compare the numerical values ​​of the theoretical displacement and the actual displacement; if the actual displacement is equal to the theoretical displacement, it means that the screw slider assembly meets the minimum smoothness requirement in the test; if the actual displacement is less than the theoretical displacement, it means that the screw slider assembly does not meet the minimum smoothness requirement in the test.

10. A smoothness detection method, characterized in that: The following steps are involved: Obtaining a first position of the slider in the screw slider assembly; A friction transmission mechanism is used to drive the screw to rotate by friction transmission, and a theoretical displacement of the screw driven by the normal action of the friction transmission is obtained; wherein the torque of the screw rotation under the minimum smoothness requirement of the screw slider assembly is defined as a reference torque, and the torque transmitted to the screw by the friction transmission mechanism through friction transmission is defined as the friction transmission torque, and the friction transmission torque is configured to be equal to the reference torque; Obtaining the second position of the slider in the screw slider assembly at this time; Based on the first position and the second position, obtaining an actual displacement of the slider during the test; Compare the numerical values ​​of the theoretical displacement and the actual displacement; if the actual displacement is equal to the theoretical displacement, it means that the screw slider assembly meets the minimum smoothness requirement in the test; if the actual displacement is less than the theoretical displacement, it means that the screw slider assembly does not meet the minimum smoothness requirement in the test.

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