Ball screw pair friction torque measuring device

Abstract

The utility model discloses a ball screw pair friction torque measuring device, which comprises a bottom plate, one end of the upper surface of the bottom plate is fixedly provided with a rotation driving assembly for driving a screw pair to rotate, the side edge of the upper surface of the bottom plate is provided with a T-shaped guide rail, and a plurality of guide assemblies are connected between the lower surface of the T-shaped guide rail and the bottom plate. According to the utility model, the base plate and the rotary driving assembly are arranged, the connecting assembly is fixedly connected with the screw nut of the screw pair during measurement, and when the screw pair is driven to rotate by the rotary driving assembly, the connecting assembly limits the rotation of the screw nut, so that the sliding sleeve is driven to move by the supporting assembly, and at the moment, the sliding sleeve generates pressure on the T-shaped guide rail in the moving process; the pressure acts on the pressure sensor and is recorded, the pressure value can be converted to obtain the friction torque of the lead screw pair, the connecting assembly of the device can be connected with lead screw pairs of more sizes, the height of the supporting assembly can be adjusted, and therefore the application range of the device is widened.

Description

TECHNICAL FIELD

[0001] The utility model relates to ball screw detection technical field especially relates to a ball screw pair friction torque measuring device. BACKGROUND

[0002] Ball screw pair is the key component of mechanical transmission system, has the extensive application on machine tool and equipment, along with machine tool and equipment to the high speed high accuracy direction development, the user to ball screw pair performance requirement is higher and higher, wherein, ball screw friction torque is screw performance an important index. In order to eliminate the axial clearance of screw rod and screw nut and make screw pair have certain axial rigidity, usually need to apply certain pre-tightening force to ball screw pair, so that a certain friction force is generated between screw nut and screw rod. In the process of screw nut movement, the torque caused by the friction force is called friction torque. And in order to judge the size of the friction torque of the screw pair, a friction torque measuring device is needed for detection.

[0003] Through the retrieval, the patent with the publication number CN219416525U discloses a kind of ball screw pair friction torque measuring device, it is by being arranged with the parallel force transmission piece of measured ball screw, change traditional force transmission rod into a smaller measuring arm, to ensure that force sensor can collect more accurate friction force change signal. But the device uses, the connection of its force transmission piece and screw nut adopts bolt fixed connection, and the connection mode causes to delay time to disassemble and assemble, and the horizontal position and height of force transmission piece cannot be adjusted, so the device can only measure the screw pair of screw nut just can be aligned with force transmission piece, the range of measurement is very limited, so it needs to be further improved. UTILITY MODEL CONTENT

[0004] The utility model aims at solving the shortcomings in prior art, and proposes a kind of ball screw pair friction torque measuring device.

[0005] In order to achieve the above object, the utility model adopts the following technical scheme: a kind of ball screw pair friction torque measuring device, including bottom plate, the bottom plate upper surface one end is fixedly installed with the rotation driving assembly of driving screw pair rotation, the bottom plate upper surface side is equipped with T type guide rail, multiple guide assemblies are connected between the bottom plate and the lower surface of T type guide rail, the bottom plate upper surface and be fixed with pressure sensor below T type guide rail, and pressure sensor top pressure measuring end is attached with the lower surface of T type guide rail, the surface of T type guide rail is slidably connected with sliding sleeve, the upper surface of sliding sleeve is fixedly connected with support assembly in middle, the support assembly other end is fixed with connecting assembly, and connecting assembly can be fixed on the surface of screw nut of screw pair, the bottom plate upper surface is installed with processor, and pressure sensor is connected with processor by signal line.

[0006] Further, the rotating drive assembly comprises a reduction motor fixed to the upper surface of the bottom plate, and the output shaft of the reduction motor is fixedly connected with a three-jaw chuck.

[0007] Further, the guide assembly comprises a first guide rod fixed to the lower surface of the T-shaped guide rail, and the bottom end surface of the first guide rod is slidingly connected with a guide sleeve, and the bottom end of the guide sleeve is fixedly connected with the upper surface of the bottom plate.

[0008] Further, the connecting assembly comprises a U-shaped plate, and the inside of the U-shaped plate is fixedly connected with a second guide rod, the surface of the second guide rod is slidingly connected with two symmetrical clamping plates, the inside of the U-shaped plate is rotatably connected with a bidirectional screw rod through a bearing, the bidirectional screw rod penetrates through the two clamping plates and is screwedly connected with the two clamping plates, and one end of the bidirectional screw rod is fixedly connected with a knob.

[0009] Further, the adjacent sides of the two clamping plates are fixedly connected with rubber pads.

[0010] Further, the support assembly comprises a right-angle square tube, the inside of the two ends of the right-angle square tube is slidingly connected with a vertical rod and a horizontal rod respectively, the bottom end of the vertical rod is fixedly connected with the upper surface of the sliding sleeve, the horizontal rod is fixedly connected with the outer side wall of the U-shaped plate at the end outside the right-angle square tube, and the side walls of the two ends of the right-angle square tube are penetratingly and screwedly connected with locking bolts.

[0011] Further, a plurality of grooves are formed in the inner top wall of the sliding sleeve, and a plurality of ball bearings are rotatably connected in the grooves, and the lower surfaces of the ball bearings are attached to the upper surface of the T-shaped guide rail.

[0012] The beneficial effects of the utility model are as follows:

[0013] 1. When the ball screw pair friction torque measuring device is used, the bottom plate, the rotating drive assembly, the T-shaped guide rail, the guide assembly, the pressure sensor, the sliding sleeve, the support assembly and the connecting assembly are arranged, the connecting assembly and the screw nut of the screw pair are fixedly connected during measurement, the connecting assembly can limit the rotation of the screw nut when the screw pair is driven to rotate by the rotating drive assembly, the sliding sleeve is driven to move by the support assembly, the T-shaped guide rail is also subjected to pressure during the movement of the sliding sleeve, the pressure acts on the pressure sensor and is recorded, the pressure value can be converted to obtain the friction torque of the screw pair, the connecting assembly of the device can be connected to screw pairs of more sizes, and the height of the support assembly can be adjusted, so that the application range of the device is expanded.

[0014] 2. When the ball screw pair friction torque measuring device is used, the connecting assembly is arranged, the connecting assembly comprises a U-shaped plate, a bidirectional screw rod and two clamping plates, the two clamping plates are brought close to each other and are pressed on the surface of the screw nut by rotating the bidirectional screw rod, the quick butt joint and disassembly of the connecting assembly and the screw nut can be realized, and the detection efficiency is improved. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the technical scheme of the present application, the following will briefly introduce the drawings needed to be used in the specific implementation manner. Obviously, the drawings described in the following are only some embodiments of the present application, and for the ordinary skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0016] Figure 1 The overall schematic view of the present application;

[0017] Figure 2 The sectional view of the guide assembly of the present application;

[0018] Figure 3 The partial perspective view of the present application;

[0019] Figure 4 The partial perspective view of the present application; Figure 1 The enlarged view of A in the present application.

[0020] The reference signs are as follows:

[0021] 1, bottom plate; 2, rotary driving assembly; 21, speed reducer motor; 22, three-jaw chuck; 3, T-shaped guide rail; 4, guide assembly; 41, first guide rod; 42, guide sleeve; 5, pressure sensor; 6, sliding sleeve; 61, groove; 62, ball; 7, supporting assembly; 71, right-angle square tube; 72, vertical rod; 73, horizontal rod; 74, locking bolt; 8, connecting assembly; 81, U-shaped plate; 82, second guide rod; 83, clamping plate; 84, bidirectional screw rod; 85, rubber pad; 9, processor. DETAILED DESCRIPTION

[0022] The technical scheme in the embodiments of the present application will be described clearly and completely in the following by combining the drawings in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by the ordinary skilled in the art without creative labor are within the protection scope of the present application.

[0023] For example, Figures 1-4As shown, it relates to a ball screw pair friction torque measuring device, including the bottom plate 1, the upper surface of the bottom plate 1 is fixedly installed with the rotary drive assembly 2 for driving the screw pair to rotate, the side of the upper surface of the bottom plate 1 is provided with the T-shaped guide rail 3, a plurality of guide assemblies 4 are connected between the lower surface of the T-shaped guide rail 3 and the bottom plate 1, the upper surface of the bottom plate 1 and below the T-shaped guide rail 3 is fixedly connected with the pressure sensor 5, and the top pressure measuring end of the pressure sensor 5 is attached to the lower surface of the T-shaped guide rail 3, the surface of the T-shaped guide rail 3 is slidably connected with the sliding sleeve 6, the upper surface of the sliding sleeve 6 is fixedly connected with the supporting assembly 7, the other end of the supporting assembly 7 is fixedly connected with the connecting assembly 8, and the connecting assembly 8 can be fixed to the surface of the screw nut of the screw pair, the upper surface of the bottom plate 1 is provided with the processor 9, and the pressure sensor 5 and the processor 9 are connected through signal lines.

[0024] The rotary drive assembly 2 comprises a reduction motor 21 fixed to the upper surface of the bottom plate 1, and the output shaft of the reduction motor 21 is fixedly connected with a three-jaw chuck 22.

[0025] By inserting one end of the screw pair to be measured into the three-jaw chuck 22, the screw pair can be fixed by the three-jaw chuck 22, so as to facilitate the rotation of the screw pair by the reduction motor 21.

[0026] The guide assembly 4 comprises a first guide rod 41 fixed to the lower surface of the T-shaped guide rail 3, and a guide sleeve 42 is slidably connected to the bottom end surface of the first guide rod 41, and the bottom end of the guide sleeve 42 is fixedly connected to the upper surface of the bottom plate 1.

[0027] By moving the guide sleeve 42 up and down along the surface of the first guide rod 41, the T-shaped guide rail 3 can be limited to move up and down. When the T-shaped guide rail 3 is pressed down, it will generate pressure on the pressure sensor 5, and the pressure value detected by the pressure sensor 5 will be fed back to the processor 9 for calculation and processing through the signal line.

[0028] The connecting assembly 8 comprises a U-shaped plate 81, and a second guide rod 82 is fixedly connected inside the U-shaped plate 81, two symmetrical clamping plates 83 are slidably connected to the surface of the second guide rod 82, a bidirectional screw rod 84 is rotatably connected inside the U-shaped plate 81 through a bearing, the bidirectional screw rod 84 penetrates through the two clamping plates 83 and is threadedly connected with the two clamping plates 83, and one end of the bidirectional screw rod 84 is fixedly connected with a knob.

[0029] When the connecting assembly 8 is fixed with the screw nut of the screw pair, the two clamping plates 83 are clamped on both sides of the surface of the screw nut, and then the bidirectional screw rod 84 is rotated by rotating the knob, and the two clamping plates 83 are driven to move towards each other along the second guide rod 82 by the bidirectional screw rod 84, so as to press the screw nut, thereby realizing the fixed connection between the connecting assembly 8 and the screw nut. When disassembling, reverse rotation of the bidirectional screw rod 84 drives the two clamping plates 83 to separate.

[0030] The rubber pads 85 are fixedly connected to the adjacent sides of the two clamping plates 83. The rubber pads 85 are arranged to protect the surface of the screw nut when the clamping plates 83 clamp the screw nut.

[0031] The support assembly 7 comprises a right-angle square tube 71, vertical rods 72 and horizontal rods 73 are slidably connected to the inner ends of the right-angle square tube 71, the bottom ends of the vertical rods 72 are fixedly connected to the upper surface of the sliding sleeve 6, the horizontal rods 73 are fixedly connected to the outer side walls of the U-shaped plates 81 at the outer ends of the right-angle square tube 71, and lock bolts 74 are screwed through the side walls of the right-angle square tube 71.

[0032] By moving the right-angle square tube 71 up and down along the vertical rods 72 and moving the horizontal rods 73 horizontally along the right-angle square tube 71, the horizontal position and height of the U-shaped plates 81 can be adjusted, so that the U-shaped plates 81 can be clamped on the screw pairs of different sizes, thereby facilitating the detection of different types of screw pairs.

[0033] A plurality of recesses 61 are formed in the inner top wall of the sliding sleeve 6, and a plurality of rolling balls 62 are rotatably connected in the recesses 61. The lower surfaces of the rolling balls 62 are in contact with the upper surface of the T-shaped guide rail 3. When the sliding sleeve 6 moves along the T-shaped guide rail 3, the rolling balls 62 can reduce the friction between the sliding sleeve 6 and the T-shaped guide rail 3, thereby reducing the error during measurement.

[0034] Working principle: first, insert one end of the screw pair into the three-jaw chuck 22, fix the screw pair through the three-jaw chuck 22, then move the sliding sleeve 6 to the end close to the three-jaw chuck 22, then adjust the position of the U-shaped plate 81 by moving the right-angle square tube 71 and the horizontal rods 73, so that the clamping plates 83 inside the U-shaped plate 81 are located on the surface of the screw nut, then rotate the bidirectional screw rod 84 to drive the two clamping plates 83 to clamp the screw nut, then tighten the two lock bolts 74 on the right-angle square tube 71 to press and fix the vertical rods 72 and the horizontal rods 73. After the above preparation is completed, start the speed reducer motor 21 to drive the screw pair to rotate. At this time, the screw nut cannot rotate under the restriction of the connecting assembly 8, so it will move along the length direction of the screw pair, thereby driving the support assembly 7 and the sliding sleeve 6 to move along the T-shaped guide rail 3. During this process, the rotating torque of the screw nut is transmitted to the sliding sleeve 6 through the connecting assembly 8 and the support assembly 7, so the sliding sleeve 6 also generates a downward pressure on the T-shaped guide rail 3. The pressure is detected by the pressure sensor 5 and transmitted to the processor 9. After calculation by the processor 9, the friction torque of the screw pair is obtained.

[0035] The preferred embodiments disclosed above are only used to help describe the utility model. The preferred embodiments do not describe all the details and do not limit the utility model to the specific implementation. Obviously, according to the content of the specification, many modifications and changes can be made. The specification selects and specifically describes these embodiments in order to better explain the principle and practical application of the utility model, so that the person skilled in the art can well understand and utilize the utility model. The utility model is limited by the claims and the whole scope and equivalents thereof.

Claims

1. A ball screw pair friction torque measuring device comprising a base plate (1), characterized in that: The upper surface of the bottom plate (1) is fixedly provided with a rotary drive assembly (2) for driving the rotation of the screw rod pair, the side of the upper surface of the bottom plate (1) is provided with a T-shaped guide rail (3), a plurality of guide assemblies (4) are connected between the lower surface of the T-shaped guide rail (3) and the bottom plate (1), a pressure sensor (5) is fixedly arranged on the upper surface of the bottom plate (1) below the T-shaped guide rail (3), the top pressure measuring end of the pressure sensor (5) is attached to the lower surface of the T-shaped guide rail (3), a sliding sleeve (6) is slidably connected to the surface of the T-shaped guide rail (3), a supporting assembly (7) is fixedly connected to the upper surface of the sliding sleeve (6), a connecting assembly (8) is fixed to the other end of the supporting assembly (7) and can be fixed to the surface of the screw nut of the screw rod pair, a processor (9) is arranged on the upper surface of the bottom plate (1), and the pressure sensor (5) and the processor (9) are connected through signal lines.

2. The friction torque measuring device for ball screw pair according to claim 1, characterized in that: The rotary drive assembly (2) comprises a speed reducer motor (21) fixed to the upper surface of the bottom plate (1), and the output shaft of the speed reducer motor (21) is fixedly connected with a three-jaw chuck (22).

3. The friction torque measuring device of a ball screw pair according to claim 1, characterized in that: The guide assembly (4) comprises a first guide rod (41) fixed to the lower surface of the T-shaped guide rail (3), and a guide sleeve (42) is slidably connected to the bottom end surface of the first guide rod (41), and the bottom end of the guide sleeve (42) is fixedly connected to the upper surface of the bottom plate (1).

4. The friction torque measuring device of a ball screw pair according to claim 1, characterized in that: The connecting assembly (8) comprises a U-shaped plate (81), and a second guide rod (82) is fixedly arranged in the U-shaped plate (81), two symmetrical clamping plates (83) are slidably connected to the surface of the second guide rod (82), a bidirectional screw rod (84) is rotatably connected to the inside of the U-shaped plate (81) through a bearing, the bidirectional screw rod (84) penetrates through the two clamping plates (83) and is threadedly connected with the two clamping plates (83), and a knob is fixedly connected to one end of the bidirectional screw rod (84).

5. The friction torque measuring device of a ball screw pair according to claim 4, characterized in that: Rubber pads (85) are fixedly connected to the adjacent sides of the two clamping plates (83).

6. The frictional torque measuring device of a ball screw pair according to claim 4, characterized in that: The supporting assembly (7) comprises a right-angle square tube (71), vertical rods (72) and horizontal rods (73) are slidably connected to the inside of the two ends of the right-angle square tube (71) respectively, the bottom end of the vertical rod (72) is fixedly connected to the upper surface of the sliding sleeve (6), one end of the horizontal rod (73) located outside the right-angle square tube (71) is fixedly connected to the outer side wall of the U-shaped plate (81), and lock bolts (74) are penetrated through and threadedly connected to the side walls of the two ends of the right-angle square tube (71).

7. The frictional torque measuring device of a ball screw pair according to claim 1, characterized in that: A plurality of grooves (61) are formed in the inner top wall of the sliding sleeve (6), and rolling balls (62) are rotatably connected in the grooves (61), and the lower surfaces of the rolling balls (62) are attached to the upper surface of the T-shaped guide rail (3).

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