CN207751464U - A kind of detection device for ball screw assembly, - Google Patents

Abstract

The utility model provides a detection device for a ball screw pair, which is easy to operate, can detect the swing clearance and friction torque of the ball screw pair, and has high precision; it includes a swing clearance detection device, a friction torque detection device, a swing The clearance detection device includes a first frame and a first workbench on it. A push cylinder is provided below the first through hole on the first workbench. The push cylinder is connected to the first placement mechanism, and the lead screw passes through the first workbench. The table, and the screw nut are clamped in the first through hole, and there are measuring shafts on both sides of the extending end of the screw, which are connected to the lever mechanism, and a measuring pen is installed outside the screw; the friction torque detection device includes the second frame and The second workbench at its bottom, on the second workbench, a workboard is installed on the second frame above the second placement mechanism, and is connected with the lifting cylinder at the top of the second frame, and the workboard is provided with a connected servo motor, The torque sensor, the ball spline, and the spline interlocking mechanism are connected under the ball spline, and are arranged in cooperation with the lead screw.

Description

A detection device for ball screw pair

technical field

The utility model relates to the technical field of ball screw pairs, in particular to a detection device for ball screw pairs.

Background technique

The ball screw pair is the most commonly used transmission element in tool machinery and precision machinery. Its main function is to convert rotary motion into linear motion, or convert torque into axial repeated force. It also has high precision, reversibility and The characteristics of high efficiency, due to its small frictional resistance, the ball screw pair is widely used in various industrial equipment and precision instruments. For high-precision machine tools, the ball screw pair is a very critical part, which can effectively improve the machine tool positioning accuracy.

Among them, the swing clearance and friction torque of the ball screw pair are important performance parameters of the ball screw pair, and directly affect the positioning accuracy, transmission efficiency, motion stability, and service life of the product. First, the ball screw pair The oscillating clearance, that is, the difference between the channel clearance of the steel ball between the nut and the screw, the existing standard for the qualified oscillating clearance value is 0.32mm~0.7mm, and the existing method of detecting the oscillating clearance has passed Feeler gauge detection is to insert a feeler gauge between the steel ball and the screw nut and the inner (outer) ring of the screw, and obtain the swing clearance value of the ball screw pair through the difference in the thickness value of the feeler gauge obtained. However, this detection method is not only cumbersome to operate, but also the detection accuracy is not high; and for the measurement of the friction torque of the ball screw pair, there is still a big gap between the development level of the ball screw pair produced in China and foreign countries. In addition to factors such as the precision of raw materials and processing equipment, the lack of perfect test and detection methods is also an important reason restricting its development.

Contents of the invention

In view of the above problems, the utility model provides a detection device for a ball screw pair, which is easy to operate, can quickly detect the swing clearance and friction torque of the ball screw pair, and has high detection accuracy.

Its technical solution is as follows, which is characterized in that it includes a swing clearance detection device and a friction torque detection device located at the same station, the swing clearance detection device includes a first frame, and the first frame is equipped with There is a first workbench, the first workbench is provided with a first through hole, and the bottom of the first frame located below the first through hole is provided with a push cylinder, and the push cylinder is connected with a ball wire. The first placement mechanism of the rod pair, and through the push cylinder, the lead screw of the ball screw pair passes through the first workbench, and the screw nut of the ball screw pair is clamped on the first In the through hole, measuring shafts are provided on opposite sides of the protruding end of the lead screw, and the measuring shafts are connected with a lever mechanism and driven by a loading cylinder. There is a measuring pen; the friction torque detection device includes a second frame, a second workbench is provided at the bottom of the second frame, and a second place for placing the ball screw pair is arranged on the second workbench. mechanism, a working plate is slidably installed on the second frame above the second placement mechanism, and is connected with the lifting cylinder at the top of the second frame, and the working plate is sequentially arranged from top to bottom Servo motors, torque sensors, and ball splines are connected to each other through couplings, and a spline linkage mechanism is connected to the bottom of the ball splines through a connecting rod, and is arranged in cooperation with the lead screw of the ball screw pair .

It is further characterized by:

A first connection plate is fixed on the side of the first frame located below the first workbench, and a slide rail arranged toward the first workbench is arranged on the first connection plate. The mechanism is slidably installed on the slide rail;

The first placement mechanism includes a first placement block installed on the slide rail, the bottom of the first placement block is connected to the push cylinder, and a hollow first placement platform is connected to the first placement block. The bottom of the lead screw is installed in the first placement table;

The lever mechanism includes a counterweight, a lever, and a pressure sensor. The upper part of the lever is connected to the counterweight, and the lower part of the lever is connected to the pressure sensor and then connected to one end of the measuring shaft. The other end is facing the outer wall of the lead screw, the middle part of the lever is connected to the fixed block and then connected to one end of the support plate through a pin shaft, the other end of the support plate is connected to the vertical plate, and the upper part of the vertical plate is connected to the loading cylinder. The lower part of the vertical plate is connected to the upper end of the first frame, the loading cylinder is located below the counterweight, and its piston rod is facing the lever rod part; the end surface of the other end of the measuring shaft is The arc surface corresponding to the outer wall surface of the lead screw, the measuring shafts on both sides surround the outer wall surface of the lead screw through the corresponding arc surface;

The pen body of the measuring pen is set on the fixing plate on the first worktable, and the nib part of the measuring pen is connected with a toggle device, and the toggle device includes a Seat plate, a toggle cylinder is fixed on the seat plate, the piston rod of the toggle cylinder is connected with a toggle plate, and the tip of the measuring pen passes through the toggle plate and contacts the outer wall of the lead screw ; The seat plate is arranged on the first workbench at the screw, and the seat plate and the toggle plate are both L-shaped;

The second placement mechanism includes a second placement block, the second placement block is fixed on the second workbench, the second placement block is provided with a hollow second placement platform, and the ball screw pair The wire mother is installed in the second placement table;

A linear guide rail is provided along the length direction of the second frame directly below the lifting cylinder, and the working plate is installed on slider one of the linear guide rail;

The spline linkage mechanism includes a connection plate connected through the connecting rod, a spline sleeve is connected to the bottom end of the connection plate, and an upper supporting piece is set on the spline sleeve, and the outer ring of the upper supporting piece is The end surface is connected with the lower supporting piece through the pin shaft 1, and the chassis is installed on the lower supporting piece, and the chassis is tightly connected with one end of the pin shaft 2, and the other end of the pin shaft 2 is in clearance fit with the spline sleeve connect;

The chassis is T-shaped, and is clamped on the lower support piece. There is a second through hole in the center of the chassis, and the screw end of the ball screw pair is arranged in the second through hole; The hole on the spline sleeve and the second through hole on the chassis are located on the same center line, and the aperture of the hole on the spline sleeve is larger than the aperture of the second through hole;

The spline sleeve above the upper bracket is connected with a monitoring mechanism through a second connecting plate, and the monitoring mechanism includes a fixed frame fixed on the second frame and a displacement frame mounted on the fixed frame. For the sensor, a guide rail is arranged on the fixed frame along its length, one end of the second connecting plate is connected to the spline sleeve, and the other end of the second connecting plate is installed on the slider of the guide rail Second, the second slider is also connected to one end of the guide plate, and the other end of the guide plate is sleeved on the sensing rod of the displacement sensor.

The beneficial effect of the utility model is that the swing clearance detection device and the friction torque detection device are located at the same station, and the lead screw of the ball screw pair passes through the first workbench by pushing the cylinder, and the screw nut is clamped on the first pass. After entering the hole, the measuring shafts on both sides apply loading force to the lead screw successively through the cooperation of the lever mechanism and the loading cylinder to make the lead screw swing left and right, then the measuring pen successively measures the measured values of the lead screw swing, so that it can be quickly detected by measuring the difference. Check the swing clearance of the ball screw pair. After the swing clearance is detected, the ball screw pair is transferred and installed in the second placement mechanism. The lifting cylinder pushes the working plate to move vertically up and down, and the servo motor on the working plate drives the spline. The linkage mechanism rotates, and the lead screw of the ball screw pair is set in conjunction with the spline linkage mechanism, the displacement can be precisely controlled by the servo motor, and the torque can be monitored by the torque sensor, so as to effectively measure the friction torque of the ball screw pair , high measurement accuracy and high measurement sensitivity.

Description of drawings

Fig. 1 is the structural representation of the utility model;

Fig. 2 is a perspective view of the swing clearance detection device;

Fig. 3 is a front view of the swing clearance detection device;

4 is a perspective view of a friction torque detection device;

Fig. 5 is a front view of the friction torque detection device;

Fig. 6 is a sectional view of the spline linkage mechanism.

Detailed ways

As shown in Figures 1 to 6, the utility model includes a swing clearance detection device and a friction torque detection device located at the same station, the swing clearance detection device includes a first frame 1, and the first frame 1 is provided with a first A workbench 2, the first workbench 2 is provided with a first through hole 3, and the bottom of the first frame 1 located below the first through hole 3 is provided with a push cylinder 4, and the push cylinder 4 is connected to a place for placing a ball screw pair The first placement mechanism, and by pushing the cylinder 4, the lead screw 5 of the ball screw pair passes through the first workbench 2, and the screw nut 6 of the ball screw pair is clamped in the first through hole 3, and the lead screw 5 stretches out. Measuring shafts 7 are provided on the opposite sides of the outlet end, and the measuring shafts 7 are connected with a lever mechanism and driven by a loading cylinder 8, and a measuring pen 9 is provided outside the lead screw 5 corresponding to the measuring shaft 7;

The side of the first frame 1 located below the first workbench 2 is fixed with a first connecting plate 10, the first connecting plate 10 is provided with a slide rail 11 arranged toward the first workbench 2, and the first placement mechanism is slidably installed on the On the slide rail 11; the first placement mechanism includes a first placement block 12 installed on the slide rail 11, the bottom of the first placement block 12 is connected to push the cylinder 4, and the first placement block 12 is connected with a hollow first placement platform 13, The bottom of the leading screw 5 is installed in the first placement table 13; the lever mechanism includes a counterweight 14, a lever 15, and a pressure sensor 16. One end of the measuring shaft 7 is connected to the outer wall of the lead screw 5, the middle part of the lever 15 is connected to the fixed block 17 and connected to one end of the support plate 19 through the pin 18, and the other end of the support plate 19 is connected to the vertical plate 20, and the vertical plate The upper part of the 20 is connected to the loading cylinder 8, the lower part of the vertical plate 20 is connected to the upper end of the first frame 1, the loading cylinder 8 is located below the counterweight 14, and its piston rod is facing the lever 15 bar; the end face of the other end of the measuring shaft 7 is The arc surface corresponding to the outer wall surface of the lead screw 5, the measuring shaft 7 on both sides surrounds the outer wall surface of the lead screw 5 through the corresponding arc surface; the pen body of the measuring pen 9 is set on the fixed plate 21 on the first workbench Above, the nib part of the measuring pen 9 is connected with a toggle device, the toggle device includes a seat plate 22 fixed on the first workbench 2, a toggle cylinder 23 is fixed on the seat plate 22, and the piston rod of the toggle cylinder 23 is connected to There is a toggle plate 24, the nib of the measuring pen 9 passes through the toggle plate 24 and contacts the outer wall of the lead screw 5; the seat plate 22 is arranged on the first workbench 2 at the lead screw 5, the seat plate 22, the toggle plate 24 are L-shaped.

As shown in Figures 4 to 6, the friction torque detection device includes a second frame 25, a second workbench 26 is provided at the bottom of the second frame 25, and a second workbench 26 for placing a ball screw pair is provided on the second workbench 26. Placement mechanism, on the second frame 25 above the second placement mechanism, a work plate 27 is slidably installed, that is, on the second frame 25 directly below the lifting cylinder 28, a linear guide rail 29 is provided along its length direction, and the work plate 27 Installed on the slide block one of the linear guide rail 29; the upper end of the working plate 27 is connected with the lifting cylinder 28 at the top of the second frame 25, and the working plate 27 is successively provided with a servo motor 30, a torque sensor 31, and a ball bearing keys 32, and are connected to each other through a coupling 33, and a spline linkage mechanism is connected to the bottom of the ball spline 32 through a connecting rod 34, and is arranged in cooperation with the lead screw 5 of the ball screw pair.

The second placement mechanism includes a second placement block 35, the second placement block 35 is fixed on the second workbench 26, the second placement block 35 is provided with a hollow second placement platform 36, and the screw nut 6 of the ball screw pair is installed. In the second placement table 36; Wherein, the table top of the first placement table 13 before the push cylinder 4 pushes and the table top of the second placement table 36 are on the same horizontal line; Disc 37, connecting disc 37 bottom end is connected with spline cover 38, and spline cover 38 is set with upper supporting plate 39, and upper supporting plate 39 outer ring end faces are connected with lower supporting plate 41 by 4 bearing pins-40, lower Chassis 42 is installed on the supporting plate 41, chassis 42 and upper supporting plate 39 are connected by 12 pin shafts 2 43, that is, chassis 42 is closely matched with one end of pin shaft 2 43, and the other end of pin shaft 2 43 is connected with the spline The sleeve 38 is connected with a gap fit, and the gap between the pin shaft 2 43 and the spline sleeve 38 is the swing amount of the chassis 42; There is a second through hole 44, the end of the lead screw 5 of the ball screw pair is arranged in the second through hole 44; the hole on the spline sleeve 38 is located on the same centerline as the second through hole 44 on the chassis 42, and The aperture of the hole on the spline sleeve 38 is greater than the aperture of the second through hole 44; the spline sleeve 38 above the upper supporting plate 39 is connected with a monitoring mechanism by the second connecting plate 45, and the monitoring mechanism includes a frame fixed on the second frame 25. The fixed frame 46 and the displacement sensor 47 installed on the fixed frame 46, the fixed frame 46 is provided with a guide rail 48 along its length direction, and one end of the second connecting plate 45 is connected on the spline sleeve 38, and the second connecting plate 45 The other end of is installed on the slide block two 49 of guide rail 48, is also connected with an end of guide plate 50 on the slide block two 49, and the other end of guide plate 50 is sleeved on the induction rod 51 of displacement sensor 47.

The working process of the present utility model is that the first placement mechanism moves toward the first workbench 2 along the slide rail 11 by pushing the cylinder 4, and the lead screw 5 of the ball screw pair passes through the first workbench 2 and the ball screw pair The screw nut 6 is fixedly clamped in the first through hole 3, and the loading cylinder 8 located at the rod of the lever 15 acts to push the lever 15 respectively. Through the principle of the lever and the monitoring of the pressure sensor 16, the measuring shaft 7 applies load to the outer wall of the screw 5 When the force is 30N, the lead screw 5 swings left and right, and the cylinder 23 is moved to push the toggle plate 24 so that the measuring pen 9 contacts the outer wall of the lead screw 5, and the measuring pen 9 successively measures the measured values of the swing of the lead screw 5, so that the difference can be quickly measured. The swing clearance of the ball screw pair is detected with high detection accuracy; after the detection of the swing play is completed, the ball screw pair returns to the original position by pushing the cylinder 4 and the first placing table 13, and then the ball screw pair passes through the production line. The jaws (not shown in the figure) are conveyed and installed in the second placement mechanism, and the lifting cylinder 28 pushes the working plate 27 to move vertically up and down along the linear guide rail 29 until the end of the screw 5 of the ball screw pair is placed on the In the second through hole 44 of the chassis 42, the servomotor 30 on the working plate 27 drives the spline linkage to rotate, then the displacement can be precisely controlled by the servomotor 30, and the torque can be monitored by the torque sensor 31. The key cover 38 is connected with a monitoring mechanism through the second connecting plate 45. During the up-and-down movement of the spline linkage mechanism, the slider 2 49 and the second connecting plate 45 also move up and down thereupon, and the guide plate 50 is mounted on the displacement sensor 47. On the sensing rod 51, the displacement sensor 47 can also monitor the displacement, which has the effect of double monitoring and high measurement accuracy, so that the friction torque of the ball screw pair can be effectively measured, and the measurement sensitivity is also high.

Claims (10)

1. a kind of detection device for ball screw assembly, which is characterized in that it includes the oscillation backlash inspection positioned at same station Device, moment of friction detection device are surveyed, the oscillation backlash detection device includes the first rack, and first rack is equipped with the One workbench, first workbench are equipped with first through hole, first bottom of the frame being located at below the first through hole Equipped with push cylinder, the push cylinder is connected with the first placement mechanism for placing ball screw assembly, and passes through the push gas It is described that cylinder makes the leading screw of the ball screw assembly, that the screw of first workbench and the ball screw assembly, be passed through to be installed in In first through hole, the opposite sides of the leading screw projecting end is equipped with survey axis, and the survey axis connection has lever mechanism, and passes through Cylinder driving is loaded, the corresponding leading screw outside surveyed at axis, which is equipped with, surveys pen；The moment of friction detection device includes the Two racks, second frame lower are equipped with the second workbench, and second workbench, which is equipped with, places the ball screw assembly, The second placement mechanism, be slidably fitted with working plate in second rack above second placement mechanism, and with it is described The lifting cylinder on the second rack top is connected, on the working plate from top to bottom successively be equipped with servo motor, torque sensor, Ball spline, and connected between each other by shaft coupling, spline interlinked mechanism is connected with by connecting rod below the ball spline, And it is equipped with the leading screw of the ball screw assembly,.

2. a kind of detection device for ball screw assembly, according to claim 1, which is characterized in that be located at described first First rack side below workbench is fixed with the first connecting plate, and first connecting plate is equipped with to first work The sliding rail set as the tablecloth, first placement mechanism are slidably mounted on the sliding rail.

3. a kind of detection device for ball screw assembly, according to claim 2, which is characterized in that described first places Mechanism includes that first be installed on the sliding rail places block, and described first, which places block bottom, connects the push cylinder, described It is connected with the first hollow mounting table on first placement block, the leading screw bottom is loaded in first mounting table.

4. a kind of detection device for ball screw assembly, according to claim 1, which is characterized in that the lever mechanism Including clump weight, lever, pressure sensor, the lever top connects the clump weight, the lever lower part and the pressure It is connect with described one end for surveying axis after sensor connection, the outer wall of leading screw, the lever described in the other end face for surveying axis It is connect with support plate one end by axis pin after the connection fixing block of middle part, the support plate other end is connect with riser, the riser top The load cylinder is connected, the riser lower part is connected to first frame upper end portion, and the load cylinder is located at described match Below pouring weight, and lever bar portion described in its piston rod face；The end face for surveying the axis other end is and the leading screw outside wall surface phase Corresponding arc surface, the survey axis of both sides surround the outside wall surface of the leading screw by corresponding arc surface.

5. a kind of detection device for ball screw assembly, according to claim 1, which is characterized in that the pen for surveying pen Body is set in the fixed plate on first workbench, and the tip part of pen for surveying pen is connected with striking gear, described to stir Device includes the seat board being fixed on first workbench, be fixed on the seat board and stir cylinder, the cylinder of stirring Piston rod is connected with swinging plate, and the pen tip for surveying pen is in contact across the swinging plate with the outside wall surface of the leading screw；It is described Seat board is set on first workbench at the leading screw, and the seat board, swinging plate are L-shaped.

6. a kind of detection device for ball screw assembly, according to claim 1, which is characterized in that described second places Mechanism includes the second placement block, and the second placement block is fixed on second workbench, and the second placement block is equipped with The second hollow mounting table, the screw of the ball screw assembly, is loaded in second mounting table.

7. a kind of detection device for ball screw assembly, according to claim 1, which is characterized in that in the lifting air The linear guide is equipped in second rack immediately below cylinder along its length, the working plate is installed on the straight line and leads On the sliding block one of rail.

8. a kind of detection device for ball screw assembly, according to claim 1, which is characterized in that the spline interlocks Mechanism includes the terminal pad through connection with the connecting rod, and the terminal pad bottom end is connected with spline housing, is covered on the spline housing Equipped with upper supporting spring, lower supporting spring is connected with by axis pin one on the upper supporting spring outer shroud end face, the subiculum on piece is equipped with chassis, The chassis is connect with one end close-fitting of axis pin two, and the other end of the axis pin two is connect with the spline housing clearance fit.

9. a kind of detection device for ball screw assembly, according to claim 8, which is characterized in that the chassis is in T Font, and it is installed in the subiculum on piece, the center chassis is provided with the second through-hole, and the leading screw end of the ball screw assembly, is set It is placed in second through-hole；Hole on the spline housing is located at the second through-hole on the chassis on same center line, and The aperture in hole is more than the aperture of second through-hole on the spline housing.

10. a kind of detection device for ball screw assembly, according to claim 8, which is characterized in that the upper supporting spring Mechanism for monitoring is connected with by the second connecting plate on the spline housing of top, the mechanism for monitoring includes being fixed on described second Fixed frame in rack and the displacement sensor being installed on the fixed frame, on the fixed frame along its length on set There are guide rail, one end of second connecting plate to be connected on the spline housing, the other end of second connecting plate is installed on institute It states on the sliding block two of guide rail, one end on the sliding block two also with guide plate is connect, and the other end of the guide plate is set in institute On the induction rod of displacement sensors.