A ball screw straightness and cylindricity detection device

Abstract

The invention discloses a device for detecting the straightness and cylindricity of a ball screw, comprising a base, on which a first fixed seat and a second fixed seat are arranged; the first fixed seat is connected to a first push rod and a third push rod, and the second fixed seat is connected to a second push rod and a fourth push rod; a sample screw is clamped between the first push rod and the second push rod, and a screw to be measured is clamped between the third push rod and the fourth push rod; the sample screw has the same lead as the screw to be measured and is arranged in parallel; the other ends of the first push rod and the third push rod are connected to a synchronization mechanism; a guide rail is arranged on the base, the guide rail is connected to a slide seat, the slide seat is connected to a dial-type measuring tool, and a probe of the dial-type measuring tool extends into the bottom of a threaded raceway groove of the screw to be measured; the slide seat is connected to a fixed rod, the fixed rod is connected to a nut, and the nut is threadedly sleeved with the sample screw; the invention realizes high-precision measurement of the straightness and cylindricity of the screw to be measured, and meets the manufacturing requirements of high-precision ball screws.

Description

Technical Field

[0001] The invention relates to the technical field of ball screw detection, and in particular to a device for detecting the straightness and cylindricity of a ball screw. Background Art

[0002] As a precision transmission device, ball screw can efficiently convert rotational motion into linear motion, and also convert linear motion into rotational motion. Its structure mainly consists of screw, nut and circulating balls. Through the rolling of balls between the screw and nut, low friction and high efficiency transmission effect is achieved. With the rapid advancement of science and technology, users' requirements for the accuracy of ball screws are increasing, resulting in a significant increase in the number and frequency of online inspection items for ball screws.

[0003] After in-depth theoretical research and practical comparison, it is found that the shape and position tolerances (including straightness and cylindricity) of the ball screw thread raceway have a significant impact on its accuracy. When the straightness tolerance is too large, the lead accuracy and torque value of the ball screw will also be out of tolerance, seriously affecting its performance. Therefore, accurately detecting the straightness and cylindricity of the ball screw thread raceway has become an urgent problem to be solved.

[0004] At present, the main method for detecting the straightness of the screw on the market is the three-needle measurement method. This method forms a three-needle structure by placing two pin gauges on the left end of the thread raceway of the ball screw and one pin gauge below. Then, a disc micrometer is used to measure the middle diameter of the upper and lower pin gauges. A point is taken every 5 pitches for measurement, and finally the difference between the maximum and minimum values ​​measured is taken as the straightness error. However, this method has obvious defects: the accuracy error of the micrometer itself is about 0.005mm, and for high-precision ball screws, the straightness error requirement is usually less than 0.005mm, so this method cannot meet the manufacturing requirements of high-precision ball screws.

[0005] As for the detection of cylindricity, there is no mature detection equipment and method on the market, which completely relies on the stability of the processing equipment. This method that relies on the stability of the processing equipment also cannot meet the manufacturing requirements of high-precision ball screws. Summary of the invention

[0006] The purpose of the present invention is to provide a ball screw straightness and cylindricity detection device to solve the problems in the prior art, thereby realizing high-precision measurement of the straightness and cylindricity of the tested screw and meeting the manufacturing requirements of high-precision ball screws.

[0007] To achieve the above object, the technical solution adopted by the present invention is:

[0008] A straightness and cylindricity detection device for a ball screw comprises a base, wherein a first fixed seat and a second fixed seat are provided on the base; the first fixed seat is connected to a first push rod and a third push rod, and the second fixed seat is connected to a second push rod and a fourth push rod; a sample screw is clamped between the first push rod and the second push rod, and a measured screw is clamped between the third push rod and the fourth push rod; the sample screw has the same lead as the measured screw and is arranged in parallel; the other ends of the first push rod and the third push rod are connected to a synchronization mechanism, and the synchronization mechanism is used to drive the first push rod and the third push rod to rotate synchronously; a guide rail is provided on the base, the guide rail is parallel to the sample screw, the guide rail is connected to a slide seat, the slide seat is connected to a dial gauge, and the dial gauge is positioned so that the probe of the dial gauge extends into the bottom of the thread raceway groove of the measured screw; the slide seat is connected to a fixed rod, the fixed rod is connected to a nut, and the nut is threadedly sleeved with the sample screw.

[0009] Furthermore, the first fixing seat is provided with a first through slot and a third through slot; the first push rod is rotatably connected to the first through slot and is axially limited by a first retaining ring; the third push rod is rotatably connected to the third through slot and is axially limited by a second retaining ring; the second fixing seat is provided with a second through slot and a fourth through slot, the second push rod is axially movably connected to the second through slot, and the fourth push rod is axially movably connected to the fourth through slot; the second fixing seat is provided with a first threaded hole connected to the second through slot, and a second threaded hole connected to the fourth through slot; the first threaded hole is connected to a first locking screw for locking the second push rod; the second threaded hole is connected to a second locking screw for locking the fourth push rod.

[0010] Furthermore, the synchronization mechanism includes a first rotating wheel, a second rotating wheel, a belt and a driving mechanism, the first rotating wheel is fixedly connected to the first push rod, the second rotating wheel is fixedly connected to the third push rod, and the belt is wrapped around the first rotating wheel and the second rotating wheel.

[0011] Furthermore, the driving mechanism is a rocker, and the rocker is connected to the third push rod.

[0012] Furthermore, the detection equipment includes a rotating accessory, which includes a ring sleeve and a third locking screw. The ring sleeve is provided with a third threaded hole, and the third locking screw is threadedly connected to the third threaded hole; the ring sleeve is used to cover the end of the measured screw rod, and the third locking screw is used to fix the ring sleeve to the measured screw rod; a stop rod is connected to the end of the third push rod close to the measured screw rod, and when the third push rod rotates, the stop rod abuts and cooperates with the third locking screw, thereby driving the measured screw rod to rotate synchronously.

[0013] Furthermore, one end of the first push rod, the second push rod, the third push rod and the fourth push rod are all provided with a tip, and the tip is used to be inserted into the end slot of the corresponding screw rod; two limiting clamps are also provided on both sides of the tip of the first push rod, and limiting grooves are provided on both side walls of the end of the sample screw rod, and the two limiting clamps are respectively plugged into and matched with the two limiting grooves.

[0014] Furthermore, the slide seat is provided with a fifth through slot extending horizontally, and the rod body of the dial-type measuring tool passes through the fifth through slot; the slide seat is provided with a fourth threaded hole connected to the fifth through slot, and the fourth threaded hole is connected to a fourth locking screw, and the fourth locking screw is used to lock the rod body of the dial-type measuring tool.

[0015] Furthermore, a steel ball is connected to the probe end of the dial-type measuring tool, and the steel ball is slidably matched with the bottom of the thread raceway groove of the measured screw rod.

[0016] Furthermore, handles are provided on four sides of the base.

[0017] A method for detecting the straightness and cylindricity of a ball screw comprises the following steps:

[0018] S1, placing the measured screw rod between the third push rod and the fourth push rod for clamping;

[0019] S2, adjusting the position of the slide seat so that the probe of the table measuring tool extends into the bottom of the thread raceway groove of the measured screw rod;

[0020] S3, driving the first push rod and the third push rod to rotate synchronously, so that the table-type measuring tool moves from one end of the sample screw rod to the other end;

[0021] S4, moving the table measuring tool from one end of the sample screw rod to the other end, observing and recording the highest point and the lowest point of the up and down swing of the probe of the table measuring tool, and calculating the sum of the highest point and the lowest point, which is the straightness error value;

[0022] S5. Move the measured screw rod by one lead, observe and record the highest point and the lowest point of the up and down swing of the probe of the table measuring tool, and calculate the sum of the highest point and the lowest point, which is the error value of the cylindricity of the measured screw rod.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] 1. The first and third ejector rods are driven to rotate synchronously by the synchronization mechanism. Combined with the characteristics that the sample screw and the screw to be measured have the same lead and are set in parallel, as well as the precise positioning and movement of the table-type measuring tool on the guide rail, high-precision measurement of the straightness and cylindricity of the screw to be measured is achieved, meeting the manufacturing requirements of high-precision ball screws;

[0025] 2. It can not only measure the straightness and cylindricity of the screw, but also measure the middle diameter, outer diameter and other dimensions of the screw by simply adjusting the contact position of the probe, which has high versatility and practicality;

[0026] 3. The first and third ejector rods are axially limited by retaining rings to ensure the stability of rotation; the second and fourth ejector rods can be axially movable and locked by locking screws to meet the measurement needs of screws of different sizes; the rotating accessories ensure the synchronous rotation between the measured screw and the ejector rod, avoid slipping, and improve the reliability and accuracy of the measurement. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0028] Figure 1 This is a schematic diagram of the overall structure of a detection device in one embodiment of the present application;

[0029] Figure 2 This is a schematic diagram of the structure of the first fixing seat in one embodiment of the present application;

[0030] Figure 3 This is a schematic diagram of the structure of the second fixing seat in one embodiment of the present application;

[0031] Figure 4 This is a schematic diagram of the structure of the third push rod in one embodiment of the present application;

[0032] Figure 5 This is a schematic diagram of the structure of a slide in one embodiment of the present application;

[0033] Figure 6 This is a schematic diagram of the structure of a table-type measuring tool in one embodiment of the present application;

[0034] In the figure: 1. base; 2. first fixed seat; 3. second fixed seat; 4. first push rod; 5. third push rod; 6. second push rod; 7. fourth push rod; 8. sample screw; 9. measured screw; 10. guide rail; 11. slide seat; 12. dial gauge; 13. fixed rod; 14. nut; 15. first locking screw; 16. second locking screw; 17. first rotating wheel; 18. second rotating wheel; 19. belt; 20. ring; 21. third locking screw; 22. stop rod; 23. limit clamp; 24. fourth locking screw; 25. zero position of dial gauge; 26. highest point; 27. lowest point. DETAILED DESCRIPTION

[0035] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] The order of execution of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0037] In the description of the present specification and the appended claims, the terms "first", "second", "third", etc. are only used to distinguish descriptions and cannot be understood as indicating or suggesting relative importance. It should also be understood that although the terms "first", "second", etc. are used to describe various elements in some embodiments of the present application in the text, these elements should not be limited by these terms. These terms are only used to distinguish one element from another element. For example, the first table can be named as the second table, and similarly, the second table can be named as the first table without departing from the scope of the various described embodiments. The first table and the second table are both tables, but they are not the same table.

[0038] References to "one embodiment" or "some embodiments" etc. described in the specification of this application mean that one or more embodiments of the present application include specific features, structures or characteristics described in conjunction with the embodiment. Therefore, the statements "in one embodiment", "in some embodiments", "in some other embodiments", "in some other embodiments", etc. that appear in different places in this specification do not necessarily refer to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized in other ways. The terms "including", "comprising", "having" and their variations all mean "including but not limited to", unless otherwise specifically emphasized in other ways.

[0039] At present, the main method for detecting the straightness of the screw on the market is the three-needle measurement method. This method forms a three-needle structure by placing two pin gauges on the left end of the thread raceway of the ball screw and one pin gauge below. Then, a disc micrometer is used to measure the middle diameter of the upper and lower pin gauges. A point is taken every 5 pitches for measurement, and finally the difference between the maximum and minimum values ​​measured is taken as the straightness error. However, this method has obvious defects: the accuracy error of the micrometer itself is about 0.005mm, and for high-precision ball screws, the straightness error requirement is usually less than 0.005mm, so this method cannot meet the manufacturing requirements of high-precision ball screws.

[0040] As for the detection of cylindricity, there is no mature detection equipment and method on the market, which completely relies on the stability of the processing equipment. This method that relies on the stability of the processing equipment also cannot meet the manufacturing requirements of high-precision ball screws.

[0041] Regarding the above technical issues, such as Figures 1 to 6 As shown, the embodiment of the present application provides a ball screw straightness and cylindricity detection device, including a base 1, on which a first fixed seat 2 and a second fixed seat 3 are provided; the first fixed seat 2 is connected to a first push rod 4 and a third push rod 5, and the second fixed seat 3 is connected to a second push rod 6 and a fourth push rod 7; a sample screw rod 8 is clamped between the first push rod 4 and the second push rod 6, and a measured screw rod 9 is clamped between the third push rod 5 and the fourth push rod 7; the sample screw rod 8 has the same lead as the measured screw rod 9 and is arranged in parallel; the first push rod 4 and the second push rod 6 are connected to the second push rod 5, and the second push rod 5 and the fourth push rod 7 are connected to the second push rod 6, and the sample screw rod 8 and the measured screw rod 9 have the same lead and are arranged in parallel; the first push rod 4 and the second push rod 6 are connected to the second push rod 6, and the sample screw rod 8 and the measured screw rod 9 are arranged in parallel. The other end of the three push rods 5 is connected to a synchronization mechanism, which is used to drive the first push rod 4 and the third push rod 5 to rotate synchronously; a guide rail 10 is provided on the base 1, and the guide rail 10 is parallel to the sample screw rod 8. The guide rail 10 is connected to a slide seat 11, and the slide seat 11 is connected to a dial-type measuring tool 12, and the dial-type measuring tool 12 is positioned so that the probe of the dial-type measuring tool 12 extends into the bottom of the thread raceway groove of the measured screw rod 9; the slide seat 11 is connected to a fixing rod 13, and the fixing rod 13 is connected to a nut 14, and the nut 14 is threadedly sleeved with the sample screw rod 8.

[0042] The first push rod 4 and the third push rod 5 are rotated synchronously through the synchronization mechanism. When they rotate, they drive the sample screw 8 and the measured screw 9 to rotate synchronously. The rotation of the sample screw 8 is converted into the lateral linear displacement of the slide 11 and the dial gauge 12 on the guide rail 10 through the nut 14 threadedly sleeved therewith. Since the measured screw 9 and the sample screw 8 have the same lead and are arranged in parallel, the probe of the dial gauge 12 is always located at the bottom of the thread raceway groove of the measured screw 9 during the rotation process, thereby providing conditions for the accurate measurement of the measured screw 9.

[0043] When detecting the straightness error of the screw, first place the screw 9 to be measured between the third push rod 5 and the fourth push rod 7 and clamp it. Then adjust the position of the slide 11 so that the probe of the dial gauge 12 accurately extends into the bottom of the thread raceway groove of the screw 9 to be measured. Then, drive the first push rod 4 and the third push rod 5 to rotate synchronously, drive the sample screw 8 and the screw 9 to be measured to rotate, and at the same time, the dial gauge 12 moves from one end of the sample screw 8 to the other end. In this process, observe and record the highest point 26 and the lowest point 27 of the up and down swing of the probe of the dial gauge 12, and calculate the sum of these two points, which is the straightness error value.

[0044] When detecting the cylindricality error of the screw rod, the first push rod 4 and the third push rod 5 are also driven to rotate synchronously to move the screw rod 9 to be measured by one lead. At this time, the value of the highest point 26 plus the lowest point 27 of the zero position 25 of the table measuring tool is the cylindricality error value of the screw rod 9 to be measured.

[0045] The ball screw detection device of the embodiment of the present application drives the first push rod 4 and the third push rod 5 to rotate synchronously through the synchronization mechanism, combines the characteristics that the sample screw 8 and the measured screw 9 have the same lead and are arranged in parallel, and the precise positioning and movement of the table measuring tool 12 on the guide rail 10, to achieve high-precision measurement of the straightness and cylindricity of the measured screw 9. It has a simple structure and is easy to operate, which can effectively improve the detection efficiency and accuracy of the ball screw and provide technical support for the production of high-precision ball screws.

[0046] Optionally, the dial gauge 12 may be a dial gauge or a micrometer.

[0047] It should be noted that in addition to measuring the straightness and cylindricity of the screw, the device can also measure the middle diameter, outer diameter and other dimensions of the screw. It only needs to adjust the probe to accurately contact the middle diameter and outer diameter surfaces of the screw 9 being measured.

[0048] It should be noted that in order to avoid errors caused by uneven equipment placement and disassembly and model change operations, before testing the product, it is necessary to find a qualified sample and repeat the measurement three times to check whether the value detected each time is consistent with the sample. If the error is less than 0.001mm, it is confirmed that there is no problem with the equipment. If it exceeds 0.001mm, the on-site technician needs to adjust the level of the equipment or check the wear of the top and make corrections.

[0049] like Figure 2 and Figure 3As shown, in some embodiments, the first fixed seat 2 is provided with a first through groove and a third through groove; the first push rod 4 is rotatably connected to the first through groove and is axially limited by the first retaining ring; the third push rod 5 is rotatably connected to the third through groove and is axially limited by the second retaining ring; the second fixed seat 3 is provided with a second through groove and a fourth through groove, the second push rod 6 is axially movably connected to the second through groove, and the fourth push rod 7 is axially movably connected to the fourth through groove; the second fixed seat 3 is provided with a first threaded hole connected to the second through groove, and a second threaded hole connected to the fourth through groove; the first threaded hole is connected to the first locking screw 15 for locking the second push rod 6; the second threaded hole is connected to the second locking screw 16 for locking the fourth push rod 7.

[0050] The first push rod 4 and the third push rod 5 are axially limited by a clamping ring, which not only ensures the stability of rotation, but also facilitates disassembly and replacement. The second push rod 6 and the fourth push rod 7 are axially movable and locked by a locking screw, which can meet the measurement requirements of screw rods of different sizes and facilitate disassembly and replacement of the screw rods.

[0051] like Figure 2 As shown, in some embodiments, the synchronization mechanism includes a first rotating wheel 17, a second rotating wheel 18, a belt 19 and a driving mechanism, the first rotating wheel 17 is fixedly connected to the first top rod 4, the second rotating wheel 18 is fixedly connected to the third top rod 5, and the belt 19 is wrapped around the first rotating wheel 17 and the second rotating wheel 18.

[0052] The first rotating wheel 17, the second rotating wheel 18 and the belt 19 form a pulley transmission structure, thereby realizing the synchronous rotation of the first push rod 4 and the third push rod 5.

[0053] To increase synchronization, the wheels can be designed with an outer toothed ring and a rack on the inner side of the belt.

[0054] In some embodiments, the driving mechanism is a rocker, and the rocker is connected to the third push rod 5. The rocker provides an intuitive and simple operation mode, and the rotation operation of the push rod can be completed by manually shaking the rocker.

[0055] like Figure 4 As shown, in some embodiments, the detection device includes a rotating accessory, the rotating accessory includes a ring sleeve 20 and a third locking screw 21, the ring sleeve 20 is provided with a third threaded hole, and the third locking screw 21 is threadedly connected to the third threaded hole; the ring sleeve 20 is used to cover the end of the measured screw rod 9, and the third locking screw 21 is used to fix the ring sleeve 20 to the measured screw rod 9; the end of the third push rod 5 close to the measured screw rod 9 is connected to a blocking rod 22, when the third push rod 5 rotates, the blocking rod 22 abuts and cooperates with the third locking screw 21, thereby driving the measured screw rod 9 to rotate synchronously.

[0056] During measurement, the ring sleeve 20 is sleeved on the end of the measured screw rod 9, and then the ring sleeve 20 is firmly fixed on the measured screw rod 9 by tightening the third locking screw 21. In addition, a stop rod 22 is connected to the end of the third push rod 5 close to the measured screw rod 9. When the third push rod 5 is driven to rotate, the stop rod 22 will abut against the third locking screw 21. Since the ring sleeve 20 and the third locking screw 21 have fixed the end of the measured screw rod 9, the rotational force of the stop rod 22 will be transmitted to the measured screw rod 9, thereby driving it to rotate synchronously. This limiting structure avoids slipping between the measured screw rod 9 and the third push rod 5, resulting in asynchronous rotation, and further improves the measurement reliability and accuracy.

[0057] In some embodiments, one end of the first push rod 4, the second push rod 6, the third push rod 5 and the fourth push rod 7 are all provided with a top tip, which is used to insert into the end slot of the corresponding screw rod; two limiting clamps 23 are also provided on both sides of the top tip of the first push rod 4, and limiting grooves are provided on the side walls on both sides of the end of the sample screw rod 8, and the two limiting clamps 23 are respectively plugged into the two limiting grooves.

[0058] By designing the cooperation between the top and the end slot of the screw rod, the coaxiality of the sample screw rod 8 and the first push rod 4 and the second push rod 6, as well as the coaxiality of the measured screw rod 9 and the third push rod 5 and the fourth push rod 7 are ensured, thereby improving the measurement accuracy. The side walls on both sides of the end of the sample screw rod 8 are designed with limit grooves, and the two limit clamps 23 can be respectively plugged into the two limit grooves at the end of the sample screw rod 8, ensuring that the push rod can accurately transmit torque to the screw rod during rotation, further improving the measurement reliability and accuracy.

[0059] like Figure 5 As shown, in some embodiments, the slide 11 is provided with a fifth through slot extending horizontally, and the rod body of the dial-type measuring tool 12 passes through the fifth through slot; the slide 11 is provided with a third threaded hole connected to the fifth through slot, and the third threaded hole is connected to the fourth locking screw 24, and the fourth locking screw 24 is used to lock the rod body of the dial-type measuring tool 12.

[0060] The rod of the dial gauge 12 passes through the fifth through slot, so that the dial gauge 12 can move horizontally on the slide 11 according to the measurement requirements, so as to adjust the contact position between the probe and the screw rod according to the measurement requirements. When the dial gauge 12 is moved to a suitable position, the rod can be firmly locked in the fifth through slot by tightening the fourth locking screw 24, ensuring that the dial gauge 12 maintains a stable position during the measurement process.

[0061] In some embodiments, a steel ball is connected to the probe end of the table measuring tool 12, and the steel ball slides with the bottom of the thread raceway groove of the measured screw rod 9. The steel ball slides with the bottom of the thread raceway groove of the measured screw rod 9, which reduces the friction resistance during measurement and makes the measurement process smoother. In addition, by designing the size of the steel ball, the measurement items can be adjusted, such as measuring the middle diameter and outer diameter of the screw rod.

[0062] In some embodiments, handles are provided on the four sides of the base 1. The handles are convenient for operators to hold and facilitate the transportation of the equipment.

[0063] Another aspect of the embodiment of the present application provides a method for detecting a straightness and cylindricity of a ball screw, comprising the following steps:

[0064] S1, placing the measured screw rod 9 between the third push rod 5 and the fourth push rod 7 for clamping;

[0065] S2. Adjust the position of the slide 11 so that the probe of the gauge 12 extends into the bottom of the thread raceway groove of the measured screw rod 9;

[0066] S3, driving the first push rod 4 and the third push rod 5 to rotate synchronously, so that the table measuring tool 12 moves from one end of the sample screw rod 8 to the other end;

[0067] S4, moving the table measuring tool 12 from one end of the sample screw rod 8 to the other end, observing and recording the highest point and the lowest point of the up and down swing of the probe of the table measuring tool 12, and calculating the sum of the highest point and the lowest point, which is the straightness error value;

[0068] S5, move the measured screw rod 9 by one lead, observe and record the highest point and the lowest point of the up and down swing of the probe of the table measuring tool 12, and calculate the sum of the highest point and the lowest point, which is the error value of the cylindricality of the measured screw rod 9.

[0069] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A ball screw straightness and cylindricity detection device, characterized in that: The invention comprises a base (1), wherein a first fixing seat (2) and a second fixing seat (3) are provided on the base (1); the first fixing seat (2) is connected to a first push rod (4) and a third push rod (5), and the second fixing seat (3) is connected to a second push rod (6) and a fourth push rod (7); a sample screw rod (8) is clamped between the first push rod (4) and the second push rod (6), and a measured screw rod (9) is clamped between the third push rod (5) and the fourth push rod (7); the sample screw rod (8) and the measured screw rod (9) have the same lead and are arranged in parallel; The other ends of the first push rod (4) and the third push rod (5) are connected to a synchronization mechanism, and the synchronization mechanism is used to drive the first push rod (4) and the third push rod (5) to rotate synchronously; The base (1) is provided with a guide rail (10), the guide rail (10) is parallel to the sample screw rod (8), the guide rail (10) is connected to a slide seat (11), the slide seat (11) is connected to a dial gauge (12), and the dial gauge (12) is positioned so that a probe of the dial gauge (12) extends into the bottom of the thread raceway groove of the measured screw rod (9); The slide seat (11) is connected to a fixing rod (13), the fixing rod (13) is connected to a nut (14), and the nut (14) is threadedly sleeved with the sample screw rod (8).

2. A ball screw straightness and cylindricity detection device according to claim 1, characterized in that: The first fixing seat (2) is provided with a first through slot and a third through slot that penetrate therethrough; the first push rod (4) is rotatably connected to the first through slot and is axially limited by a first snap ring; the third push rod (5) is rotatably connected to the third through slot and is axially limited by a second snap ring; The second fixing seat (3) is provided with a second through slot and a fourth through slot extending therethrough; the second push rod (6) is axially movably connected to the second through slot, and the fourth push rod (7) is axially movably connected to the fourth through slot; the second fixing seat (3) is provided with a first threaded hole connected to the second through slot, and a second threaded hole connected to the fourth through slot; the first threaded hole is connected to a first locking screw (15) for locking the second push rod (6); the second threaded hole is connected to a second locking screw (16) for locking the fourth push rod (7).

3. The straightness and cylindricity detection device of a ball screw according to claim 1, characterized in that: The synchronization mechanism comprises a first rotating wheel (17), a second rotating wheel (18), a belt (19) and a driving mechanism, wherein the first rotating wheel (17) is fixedly connected to the first top rod (4), the second rotating wheel (18) is fixedly connected to the third top rod (5), and the belt (19) is wound around the first rotating wheel (17) and the second rotating wheel (18).

4. The straightness and cylindricity detection device of a ball screw according to claim 3, characterized in that: The driving mechanism is a rocker, and the rocker is connected to the third push rod (5).

5. The ball screw straightness and cylindricity detection device according to claim 1, characterized in that: The rotary accessory comprises a ring sleeve (20) and a third locking screw (21); the ring sleeve (20) is provided with a third threaded hole, and the third locking screw (21) is threadedly connected to the third threaded hole; the ring sleeve (20) is used to cover the end of the measured screw rod (9), and the third locking screw (21) is used to fix the ring sleeve (20) to the measured screw rod (9); One end of the third push rod (5) close to the measured screw rod (9) is connected to a blocking rod (22). When the third push rod (5) rotates, the blocking rod (22) abuts against the third locking screw (21), thereby driving the measured screw rod (9) to rotate synchronously.

6. The device for detecting the straightness and cylindricity of a ball screw according to claim 1, characterized in that: One end of each of the first push rod (4), the second push rod (6), the third push rod (5) and the fourth push rod (7) is provided with a tip, and the tip is used to be inserted into the end slot of the corresponding screw rod; Two limiting clamping plates (23) are also provided on both sides of the top end of the first push rod (4), and limiting grooves are provided on both side walls of the end of the sample screw rod (8), and the two limiting clamping plates (23) are respectively plugged into and matched with the two limiting grooves.

7. The device for detecting the straightness and cylindricity of a ball screw according to claim 1, characterized in that: The slide seat (11) is provided with a fifth through slot extending horizontally, and the rod body of the dial-type measuring tool (12) passes through the fifth through slot; the slide seat (11) is provided with a fourth threaded hole connected to the fifth through slot, and the fourth threaded hole is connected to a fourth locking screw (24), and the fourth locking screw (24) is used to lock the rod body of the dial-type measuring tool (12).

8. The device for detecting the straightness and cylindricity of a ball screw according to claim 1, characterized in that: A steel ball is connected to the probe end of the dial-type measuring tool (12), and the steel ball is in sliding engagement with the bottom of the thread raceway groove of the measured screw rod (9).

9. The device for detecting the straightness and cylindricity of a ball screw according to claim 1, characterized in that: Handles are respectively provided on the four sides of the base (1).

10. A method for detecting the straightness and cylindricity of a ball screw using the device for detecting the straightness and cylindricity of a ball screw as claimed in claim 1, characterized in that: The following steps are involved: S1, placing the measured screw rod (9) between the third push rod (5) and the fourth push rod (7) for clamping; S2, adjusting the position of the slide seat (11) so that the probe of the table measuring tool (12) extends into the bottom of the thread raceway groove of the measured screw rod (9); S3, driving the first push rod (4) and the third push rod (5) to rotate synchronously; S4, move the dial gauge (12) from one end of the sample screw rod (8) to the other end, observe and record the highest point and the lowest point of the up and down swing of the probe of the dial gauge (12), and calculate the sum of the highest point and the lowest point, which is the straightness error value. S5. Move the measured screw rod (9) by one lead, observe and record the highest point and the lowest point of the up and down swing of the probe of the table measuring tool (12), and calculate the sum of the highest point and the lowest point, which is the error value of the cylindricality of the measured screw rod (9).

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