A high-precision ball spline pair pre-pressing detection device

Abstract

The utility model discloses a high accuracy ball spline pair pre -press detection device, including work table, V type block, ball spline pair, tow rope, support frame, fixed pulley assembly, tray and weight, be provided with two V type blocks on the work table, be provided with the ball spline pair of detection on two V type blocks, one end of work table is fixed with support frame, and the support frame is fixed with fixed pulley assembly, one end of tow rope is connected with the spline female of ball spline pair, and the other end of tow rope is connected with tray after passing fixed pulley assembly, and be provided with weight on the tray, the center line of two V type blocks, ball spline pair, support frame, fixed pulley assembly is on a straight line, the utility model discloses high accuracy ball spline pair pre -press detection device simple structure, low in manufacturing cost, and the operation is very convenient, can satisfy the detection of multiple model spline pair pre -pressure, and the influence of traditional artificial factor is excluded, and the detection accuracy is high, can be widely used in the promotion in ball spline pair industry.

Description

Technical Field

[0001] This utility model relates to the field of high-precision ball spline pair technology, and in particular to a high-precision ball spline pair preload detection device. Background Technology

[0002] Ball spline pairs are a commonly used linear motion element, consisting of a spline shaft, a spline nut, steel balls, and a return mechanism. Both the outer diameter of the spline shaft and the inner bore of the spline nut have spline channels. The steel balls move linearly within the raceways formed by the spline shaft and spline nut, enabling the transmission of excessive loads and power, and offering a long service life. They are now widely used in automated equipment.

[0003] In recent years, with the rapid development of automated equipment, the market has placed higher demands on ball spline pairs, especially on the control of spline pair preload. The magnitude of the spline pair preload directly affects the overall performance of the ball spline pair. A higher preload results in higher rigidity, increased friction, and increased heat generation; conversely, a lower preload reduces rigidity, friction, and heat generation. In the automation industry, considering both the rigidity and heat generation of the ball spline pair, a light preload is generally chosen. This is achieved by increasing the size of the steel balls to make the clearance negative, based on an initial zero clearance.

[0004] In existing technologies, the traditional preload test for ball spline pairs uses a handheld tension / compression gauge. Traditional spline nut torque testing involves gently pushing the spline nut with a digital push-pull force gauge and recording the preload value. During this process, variations in hand speed can cause acceleration, affecting the test results. This testing method is affected by the speed of the push force and cannot accurately measure the preload of the spline pair. Utility Model Content

[0005] The purpose of this invention is to provide a high-precision ball spline preload detection device that is simple in structure, easy to operate, and has high detection accuracy.

[0006] The technical solution to achieve the purpose of this utility model is as follows:

[0007] A high-precision ball spline preload detection device includes a worktable, V-blocks, a ball spline pair, a traction rope, a support frame, a fixed pulley assembly, a tray, and weights. Two V-blocks are mounted on the worktable, and the ball spline pair to be tested is mounted on each V-block. The ball spline pair includes a spline shaft, a spline nut, a return mechanism, and steel balls. The spline nut and return mechanism move linearly along the spline shaft. A support frame is fixed to one end of the worktable, and a fixed pulley assembly is fixed to the support frame. One end of the traction rope is connected to the spline nut of the ball spline pair, and the other end of the traction rope passes around the fixed pulley assembly and is connected to the tray, on which weights are mounted. The centerlines of the two V-blocks, the ball spline pair, the support frame, and the fixed pulley assembly are all on a straight line.

[0008] Preferably, two V-shaped blocks are fixed to the workbench by screws, and the two V-shaped blocks are the same shape and size.

[0009] Preferably, the support frame has an inclined plane with multiple sets of mounting holes, and the fixed pulley assembly is fixed to the support frame with screws; the fixed pulley assembly selects the appropriate mounting holes according to different models of ball spline pairs to ensure that the force applied to the spline nut is horizontal.

[0010] Preferably, the fixed pulley assembly includes a mounting bracket, a V-groove, a deep groove ball bearing, and bolts and nuts; the mounting bracket is connected to the V-groove by bolts and nuts, and deep groove ball bearings are provided at both ends of the inner hole of the V-groove.

[0011] Preferably, the V-groove is made of synthetic fiber material.

[0012] Preferably, a crash pad is placed on the inside of the V-shaped block near the support frame.

[0013] Preferably, the anti-collision pad is made of synthetic fiber material.

[0014] Preferably, the two V-shaped blocks are made of synthetic fiber material.

[0015] Preferably, the traction rope is made of lightweight nylon rope.

[0016] Compared with the prior art, the significant advantages of this utility model are:

[0017] (1) The high-precision ball spline pair preload detection device of this utility model has a simple structure, low manufacturing cost and very convenient operation, and can meet the detection of preload of multiple models of spline pairs.

[0018] (2) The high-precision ball spline preload detection device of this utility model eliminates the influence of traditional human factors, has high detection accuracy, and can be widely promoted and used in the ball spline industry.

[0019] (3) The components of the high-precision ball spline pair preload detection device of this utility model that come into contact with the ball spline pair are all made of synthetic fiber materials, which greatly reduces the risk of wear or scratches on the ball spline pair during the detection process. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the accompanying drawings required in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the high-precision ball spline pair preload detection device of this utility model.

[0022] Figure 2 This is a three-dimensional schematic diagram of the high-precision ball spline pair preload detection device of this utility model.

[0023] In the diagram: 1. Workbench; 2. V-block; 3. Ball spline pair; 4. Traction rope; 5. Anti-collision block; 6. Support frame; 7. Fixed pulley assembly; 8. Tray; 9. Weight; 3-1 is spline shaft; 3-2 is spline nut; 3-3 is spline return mechanism; 3-4 is steel ball; 7-1 is mounting bracket; 7-2 is V-groove; 7-3 is deep groove ball bearing; 7-4 is bolt and nut. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model. Example

[0025] Please see Figure 1 and Figure 2 This utility model provides the following technical solution: a high-precision ball spline pair preload detection device, comprising a worktable 1, V-blocks 2, ball spline pairs 3, traction ropes 4, support frames 6, fixed pulley assembly 7, trays 8, and weights 9; two V-blocks 2 are arranged on the worktable 1, and the ball spline pairs 3 to be tested are arranged on the two V-blocks 2; the ball spline pairs 3 include a spline shaft 3-1, a spline nut 3-2, a return mechanism 3-3, and steel balls 3-4, the spline nut 3-2... -2 and the return mechanism 3-3 move linearly on the spline shaft 3-1; a support frame 6 is fixed at one end of the worktable 1, and a fixed pulley assembly 7 is fixed on the support frame 6; one end of the traction rope 4 is connected to the spline nut 3-2 of the ball spline pair 3, and the other end of the traction rope 4 passes around the fixed pulley assembly 7 and is connected to the tray 8, on which a weight 9 is provided; the center lines of the two V-blocks 2, the ball spline pair 3, the support frame 6, and the fixed pulley assembly 7 are on a straight line.

[0026] In this embodiment, the outer circle of the spline shaft 3-1 in the ball spline pair 3 is provided with 3 spline grooves, and the inner hole of the spline nut 3-2 is also provided with 3 spline inner raceways. The steel ball 3-4 is installed in the spline nut 3-2 through the return device 3-3. The steel ball 3-4 can roll in the raceway of the spline nut 3-2. When the spline nut 3-2, along with the return device 3-3 and the steel ball 3-4, is fitted onto the spline shaft 3-1, the entire spline pair moves linearly on the spline shaft 3-1.

[0027] Specifically, two V-blocks 2 are fixed to the workbench 1 by screws. The two V-blocks 2 are the same in shape and size. After long-term use and wear, the two V-blocks 2 can be replaced.

[0028] Specifically, the ball spline assembly 3 is placed on two V-blocks 2 with the same height. If the height difference between the two V-blocks is too large, the ball spline assembly 3 will tilt, and the component of gravity of the spline nut 3-2 will affect the torque detection.

[0029] Specifically, the V-block 2 is made of synthetic fiber material, which reduces the risk of wear and scratches on the spline shaft 3-1 compared to the steel V-block.

[0030] Specifically, the support frame 6 is provided with an inclined plane, and multiple sets of mounting holes are provided on the inclined plane. The fixed pulley assembly 7 is fixed to the support frame 6 by screws. The fixed pulley assembly 7 selects the appropriate mounting hole according to the different models of ball spline pairs 3 to ensure that the force applied to the spline nut 3-2 is horizontal.

[0031] Specifically, the fixed pulley assembly 7 includes a mounting bracket 7-1, a V-groove 7-2, a deep groove ball bearing 7-3, and bolts and nuts 7-4; the mounting bracket 7-1 is U-shaped, and a V-groove 7-2 is installed in the U-groove. Each end of the inner hole of the V-groove 7-2 has a hole for installing the deep groove ball bearing 7-3.

[0032] Specifically, the V-groove 7-2 is made of synthetic fiber material. Deep groove ball bearings 7-3 are installed at both ends of the V-groove 7-2, which are threaded onto bolts 7-4 and fixed in the mounting bracket 7-1. The other end is fixed with a nut, and the V-groove 7-2 rotates smoothly.

[0033] Specifically, an anti-collision pad 5 is placed on the inner side of the V-shaped block near the support frame 6 to prevent the spline nut 3-2 from impacting the V-shaped block 2 when it moves quickly. The anti-collision pad 5 is made of synthetic fiber material to avoid the risk of wear and scratches when the spline nut 3-2 is impacted during rapid movement.

[0034] Specifically, the traction rope 4 is made of lightweight nylon rope. One end of the traction rope 4 is tied to the spline nut 3-2, and the middle part is supported in the V-groove 7-2 of the fixed pulley assembly 7. The tail end of the traction rope 4, passing through the V-groove 7-2, is tied to the tray 8. Under the action of gravity, the tray 8 is vertically downward. The weight of the traction rope 4 and the tray 8 needs to be calibrated (A).

[0035] Specifically, weights 9 are of various specifications. The weights 9 are placed on tray 8 and their weight is continuously increased until spline nut 3-2 moves on spline shaft 3-1. The weight B of the weights at this point is recorded. The preload of spline pair 3 at this time can be recorded as the weight A+B, which can be converted into force.

[0036] The working principle and usage process of this utility model are as follows: Before use, install V-blocks 2 on the workbench 1, ensuring the distance between the two V-blocks 2 matches the length of the spline shaft 3-1 in the ball screw spline pair 3 to be tested for preload. A support frame 6 is installed on one edge of the workbench. Based on the force application point of the ball spline pair 3 being tested, select appropriate screw holes on the support frame 6 to fix the fixed pulley assembly 7. Simultaneously, install anti-collision pads 5 on the inner side of the V-blocks 2 near the support frame 6. Pass the traction rope 4, with the tray 8 attached, through the V-groove 7-2 in the fixed pulley assembly 7 and connect it to the spline nut 3-2, so that the upper traction rope 4 is parallel to the spline shaft 3-1. After the fixed pulley assembly 7 reverses direction, the traction rope 4 pulls the tray 9 vertically downwards.

[0037] First, move the spline nut 3-2 to the inside of the V-block 2 without the anti-collision pad 5. Then, place a weight 9 in the tray 8 and continuously increase the weight of the weight 9 until the spline nut 3-2 moves along the spline shaft 3-1. Record the weight required to move the spline nut 3-2.

[0038] When the preload range of a certain type of ball spline assembly 3 is given, the preload can be converted into a total weight M, which includes the weight of the traction rope 4, the tray 8, and the weight of the loading weight 9. During testing, the minimum weight Mmin and the maximum weight Mmax can be set. When the minimum weight Mmin is applied, the spline nut 3-2 does not move; when the maximum weight Mmax is applied, the spline nut can move.

[0039] This utility model of a high-precision ball spline preload testing device features a simple structure, low manufacturing cost, and very convenient operation. It can effectively test the preload of various types of spline pairs. Eliminating the influence of traditional human factors, this high-precision ball spline preload testing device offers high accuracy and can be widely used in the ball spline pair industry. All components in contact with the ball spline pair are made of synthetic fiber materials, significantly reducing the risk of wear or scratches during testing.

[0040] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A high-precision ball spline pair preload detection device, characterized in that, The components include a worktable (1), V-blocks (2), ball spline pairs (3), traction ropes (4), support frames (6), fixed pulley assemblies (7), trays (8), and weights (9); two V-blocks (2) are provided on the worktable (1), and ball spline pairs (3) to be tested are provided on the two V-blocks (2); the ball spline pairs (3) include a spline shaft (3-1), a spline nut (3-2), a return mechanism (3-3), and steel balls (3-4). The spline nut (3-2) and the return mechanism (3-3) are located on the spline shaft (3-1). 3-1) Makes linear motion on the workbench (1); a support frame (6) is fixed at one end of the workbench (1), and a fixed pulley assembly (7) is fixed on the support frame (6); one end of the traction rope (4) is connected to the spline nut (3-2) of the ball spline pair (3), and the other end of the traction rope (4) passes around the fixed pulley assembly (7) and is connected to the tray (8), and a weight (9) is set on the tray (8); the center lines of the two V-blocks (2), the ball spline pair (3), the support frame (6), and the fixed pulley assembly (7) are on a straight line.

2. The high-precision ball spline pair preload detection device according to claim 1, characterized in that, Two V-blocks (2) are fixed on the workbench (1) by screws. The two V-blocks (2) are the same in shape and size.

3. The high-precision ball spline pair preload detection device according to claim 1, characterized in that, The support frame (6) is provided with an inclined plane, and multiple sets of mounting holes are provided on the inclined plane. The fixed pulley assembly (7) is fixed to the support frame (6) by screws. The fixed pulley assembly (7) selects the appropriate mounting hole according to the different models of ball spline pairs (3) to ensure that the force applied to the spline nut is horizontal.

4. The high-precision ball spline pair preload detection device according to claim 1, characterized in that, The fixed pulley assembly (7) includes a mounting bracket (7-1), a V-groove (7-2), a deep groove ball bearing (7-3), and bolts and nuts (7-4); the mounting bracket (7-1) is connected to the V-groove (7-2) by bolts and nuts (7-4), and deep groove ball bearings (7-3) are provided at both ends of the inner hole of the V-groove (7-2).

5. The high-precision ball spline pair preload detection device according to claim 4, characterized in that, The V-groove (7-2) is made of synthetic fiber material.

6. The high-precision ball spline pair preload detection device according to claim 1, characterized in that, Anti-collision pads (5) are placed on the inside of the V-shaped block near the support frame (6).

7. The high-precision ball spline pair preload detection device according to claim 6, characterized in that, The anti-collision pad (5) is made of synthetic fiber material.

8. The high-precision ball spline pair preload detection device according to claim 1, characterized in that, The two V-shaped blocks (2) are made of synthetic fiber material.

9. The high-precision ball spline pair preload detection device according to claim 1, characterized in that, The traction rope (4) is made of lightweight nylon rope.

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