Ball screw axial clearance detection device special for EMB braking system

Abstract

The invention discloses a ball screw axial clearance detection device special for an EMB braking system, and the device comprises a workbench, the workbench is sequentially provided with a nut installation seat, a lead screw installation seat and a measurement mechanism from left to right, the nut installation seat is fixed on the upper surface of the workbench, and a nut clamping mechanism is fixed on the nut installation seat; a movable plate is slidably connected to the lower surface of the workbench, a movable plate movement driving mechanism is arranged on the workbench, a lead screw mounting seat penetrates through the workbench to be slidably connected to the movable plate, a lead screw clamping mechanism is arranged on the lead screw mounting seat, and a bidirectional pressurization pushing mechanism is fixed to the movable plate. The pressurizing pushing mechanism in one direction is used for pushing the lead screw mounting seat to move rightwards, and the pressurizing pushing mechanism in the other direction is used for pushing the lead screw mounting seat to move leftwards; a detection head in the measuring mechanism abuts against the end of the lead screw. The testing device has the advantages that the testing device capable of detecting the axial clearance of the blind hole nut is provided, and the market vacancy is filled.

Description

Technical Field

[0001] The invention relates to the field of ball screw detection devices, and in particular to a ball screw axial clearance detection device dedicated to an EMB brake system. Background Art

[0002] In the EMB braking system, the ball screw is a key transmission component responsible for accurately transmitting power. Due to the high precision requirements of the EMB braking system, the axial clearance of the ball screw becomes an important factor affecting the system performance. The nut in the ball screw dedicated to the EMB braking system is a piston-type blind hole structure with a spiral raceway inside that is connected by a steel ball and the outer spiral raceway of the screw. Traditional ball screw detection devices mostly perform clearance detection on conventional through-hole nuts.

[0003] A Chinese invention patent with application publication number CN108709483A discloses a ball screw axial clearance test device, including a ball screw mounting seat for fixing the nut or screw of the ball screw; a loading device, abutting against the screw or nut of the ball screw to limit the rotation of the screw or nut of the ball screw, and driving the screw or nut of the ball screw to move axially; a measuring device, for measuring the axial movement of the screw or nut of the ball screw driven by the loading device, which solves the problem that the axial clearance measuring instruments currently on the market do not constrain the screw in the circumferential direction, and the screw of the ball screw will rotate in the direction of the force during the measurement process, resulting in erroneous measurement results, but it is not suitable for the axial clearance test of the ball screw shaft dedicated to the EMB brake system. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a ball screw axial clearance detection device dedicated to an EMB brake system, which can be used for axial clearance detection after a blind hole nut and a screw are matched.

[0005] The technical solution adopted by the present invention to solve the above-mentioned technical problems is: a ball screw axial clearance detection device dedicated to an EMB brake system, comprising a workbench, on which a nut mounting seat, a screw mounting seat and a measuring mechanism are arranged in sequence from left to right, the nut mounting seat is fixed to the upper surface of the workbench, and a nut clamping mechanism is fixed to the nut mounting seat; a movable plate is slidably connected to the lower surface of the workbench, and a movable plate moving driving mechanism is arranged on the workbench, the screw mounting seat passes through the workbench and is slidably connected to the movable plate, the screw mounting seat is arranged on the screw clamping mechanism, and a bidirectional pressure pushing mechanism is fixed on the movable plate, wherein the pressure pushing mechanism in one direction is used to push the screw mounting seat to move to the right, and the pressure pushing mechanism in the other direction is used to push the screw mounting seat to move to the left; the detection head in the measuring mechanism is against the end of the screw, and is used to measure the axial movement distance of the screw.

[0006] Furthermore, the nut clamping mechanism includes a V-block, a cylinder clamp wrench and two relatively arranged cylinder clamps. The cylinder clamp wrench is fixed on the workbench and is used to control the start and stop of the cylinder clamp. The V-block is fixed on the horizontal plane of the nut mounting seat. The cylinder clamp is fixed on the vertical plane of the nut mounting seat through a gasket. Stop blocks are respectively fixed on the opposite sides of the two gaskets. The nut is placed in the V-block. After the right end face of the nut is against the stop block, the cylinder clamp is used to tighten the left end of the nut.

[0007] Furthermore, a chuck groove is fixed on the upper end of the screw mounting seat for installing the screw clamping mechanism, and pressure sensors are fixed on the left and right sides of the lower end of the screw mounting seat for detecting the pressure applied by the pressurizing pushing mechanism on the screw mounting seat.

[0008] Furthermore, the screw clamping mechanism is an elastic chuck, and an adjustable screw fixing platform is fixed to the left end of the elastic chuck. The screw fixing platform is a semi-closed circular ring with a slot. After the screw is installed, the slot is locked by screws so that the screw is fixed in the screw fixing platform. The right end of the elastic chuck is integrally provided with a chuck plate that cooperates with the chuck slot.

[0009] Furthermore, the movable plate movement driving mechanism includes a handwheel, a screw and a nut seat, the nut seat is fixed to the lower surface of the workbench, the screw is threadedly connected to the nut seat, the left end of the screw is rotatably connected to the movable plate, and the right end of the screw is fixedly connected to the handwheel, a sliding groove is opened on the movable plate, a connecting seat is slidably connected to the sliding groove, the screw mounting seat is fixed on the connecting seat, and the screw mounting seat slides in the sliding groove.

[0010] Furthermore, a scale display device is provided on the upper surface of the workbench for displaying the stroke position of the ball screw during detection. The scale display device includes a scale, a pointer moving groove and a pointer arranged on the workbench. The scale and the pointer moving groove are arranged on the workbench. The pointer passes through the workbench and is fixed on the moving plate. The pointer slides in the pointer moving groove.

[0011] Furthermore, the pressurizing pushing mechanism includes a left control handle, a right control handle, and a left pressurizing cylinder and a right pressurizing cylinder arranged opposite to each other. The left pressurizing cylinder and the right pressurizing cylinder are fixed on the lower surface of the movable plate and are located on the same straight line as the pressure sensor. The left control handle and the right control handle are fixed on the workbench. The left control handle is used to control the start and stop of the left pressurizing cylinder, and the right control handle is used to control the start and stop of the right pressurizing cylinder. Pulling the left control handle causes the piston rod of the left pressurizing cylinder to apply pressure to the left side of the screw mounting seat, and pulling the right control handle causes the piston rod of the right pressurizing cylinder to apply pressure to the right side of the screw mounting seat.

[0012] Furthermore, an air source device, a pressure regulating valve and a pressure display are fixed on the workbench, and the gas pressure provided by the air source device is adjusted by the pressure regulating valve, so that the cylinder pressure of the left pressurized cylinder and the right pressurized cylinder can adapt to the push-pull force required for different types of ball screw working conditions.

[0013] Furthermore, the measuring mechanism includes a slide rail fixed on the upper surface of the workbench, a slider is slidably fitted on the slide rail, a locking block is fixed to the bottom of the slider, the locking block is used to lock the slider so that the slider and the slide rail are fixed, a digital display is fixedly connected to the upper end of the slider, and the detection head of the digital display is abutted against the end of the screw.

[0014] Compared with the prior art, the advantage of the present invention is that the detection device can be used to detect the axial clearance of the special ball screw in the EMB brake system, filling the market gap; in addition, an adjustable nut clamping mechanism and air source device are adopted, and the sizes of ball screws of different models are adapted by replacing gaskets and blocks of different sizes, and the gas pressure is adjusted by a pressure regulating valve to adapt to the working conditions of ball screws of different models, providing wider adaptability and flexibility. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the three-dimensional structure of the front side of the present invention; Figure 2 An exploded view of the present invention; Figure 3 It is a schematic diagram of the three-dimensional structure of the rear side of the present invention; Figure 4It is a structural schematic diagram of the nut clamping mechanism of the present invention; Figure 5 It is a structural schematic diagram of the screw mounting seat, the screw clamping mechanism and the moving plate of the present invention; Figure 6 It is a structural schematic diagram of the measuring mechanism of the present invention; Figure 7 It is a schematic diagram of the detection state of the present invention. DETAILED DESCRIPTION

[0016] The present invention is further described in detail below with reference to the accompanying drawings.

[0017] like Figure 1-7As shown, a ball screw axial clearance detection device dedicated to an EMB brake system includes a workbench 1, on which a nut mounting seat 2, a screw mounting seat 3 and a measuring mechanism 4 are arranged from left to right in sequence, the nut mounting seat 2 is fixed to the upper surface of the workbench 1, a nut clamping mechanism 5 is fixed to the nut mounting seat 2, the nut clamping mechanism 5 includes a V-block 51, a cylinder clamp wrench 52 and two cylinder clamps 53 arranged oppositely, the cylinder clamp wrench 52 (i.e., the start and stop switch of the cylinder clamp 53) is fixed on the workbench 1, the cylinder clamp wrench 52 is used to control the start and stop of the cylinder clamp 53, the V-block 51 is fixed on the horizontal plane of the nut mounting seat 2, and the cylinder clamp 53 is connected to the workbench 1 by a gasket 54. It is fixed on the vertical surface of the nut mounting seat 2, and blocks 55 are fixed on the opposite sides of the two gaskets 54. The nut is placed in the V-block 51. After the right end face of the nut 01 abuts against the block 55, the cylinder clamp 53 is used to tighten the left end of the nut 01 to complete the installation of the nut 01. By replacing gaskets 54 and blocks 55 of different thicknesses and sizes, ball screws dedicated to the EMB brake system of different models can be detected; a chuck groove 31 is fixed on the upper end of the screw mounting seat 3 for installing a screw clamping mechanism, and the screw clamping mechanism is an elastic chuck 6. An adjustable screw fixing platform 61 is fixed to the left end of the elastic chuck 6. The screw fixing platform 61 is a semi-closed circular ring with a slot. After the lead screw 02 is installed, the slot is locked by screws so that the lead screw 02 is fixed in the lead screw fixing platform 61. The right end of the elastic chuck 6 is integrally provided with a chuck piece 62 that cooperates with the chuck groove 31. The chuck piece 62 is made of elastic plastic material, which is convenient for the elastic chuck 6 to be taken out from the chuck groove 31. After the lead screw 02 is installed, the elastic chuck 6 is installed in the chuck groove 31 to complete the installation of the lead screw 02; the lower surface of the workbench 1 is slidably connected with a moving plate 7, and a moving plate moving drive mechanism is provided on the workbench 1. The moving plate moving drive mechanism includes a handwheel 71, a screw rod 72 and a nut seat 73. The nut seat 73 is fixed to the lower surface of the workbench 1, and the screw 72 and the nut seat 73 are fixed to the lower surface of the workbench 1. Screw connection, the left end of the screw rod 72 is rotatably connected to the movable plate 7, the right end of the screw rod 72 is fixedly connected to the hand wheel 71, a sliding groove 74 is provided on the movable plate 7, a connecting seat 75 is slidably connected to the sliding groove 74, the screw mounting seat 3 is fixed on the connecting seat 75, the screw mounting seat 3 slides in the sliding groove 74, and a scale display device is provided on the upper surface of the workbench 1 for displaying the stroke position during the ball screw detection, the scale display device includes a scale 76, a pointer moving groove 77 and a pointer 78, the scale 76 and the pointer moving groove 77 are provided on the workbench 1, the pointer 78 passes through the workbench 1 and is fixed on the movable plate 7, and the pointer 78 slides in the pointer moving groove 77;A bidirectional pressurizing mechanism 8 is fixed on the moving plate 7, wherein one direction of the pressurizing mechanism is used to push the screw mounting seat 3 to move rightward, and the other direction of the pressurizing mechanism is used to push the screw mounting seat 3 to move leftward. Pressure sensors 32 are fixed on opposite sides of the lower end of the screw mounting seat 3 to detect the pressure applied by the pressurizing mechanism 8 on the screw mounting seat 3. The pressurizing mechanism 8 includes a left control handle 83 (i.e., the start / stop switch of the left pressurizing cylinder 81), a right control handle 84 (i.e., the start / stop switch of the right pressurizing cylinder 82), and a left control handle 83 (i.e., the start / stop switch of the left pressurizing cylinder 81). ), the left pressurizing cylinder 81 and the right pressurizing cylinder 82 are relatively arranged, the left pressurizing cylinder 81 and the right pressurizing cylinder 82 are fixed on the lower surface of the movable plate 7 and are located in the same straight line as the pressure sensor 32, the left control handle 83 and the right control handle 84 are fixed on the workbench 1, the left control handle 83 is used to control the start and stop of the left pressurizing cylinder 81, and the right control handle 84 is used to control the start and stop of the right pressurizing cylinder 82, and the left control handle 83 is pulled so that the piston rod of the left pressurizing cylinder 81 applies pressure to the left side of the screw mounting seat 3, so that the screw The ball screw mounting seat 3 slides to the right, and the right control handle 84 is pulled so that the piston rod of the right pressurized cylinder 82 applies pressure to the right side of the screw mounting seat 3, so that the screw mounting seat 3 slides to the left, and pressure is applied to the screw mounting seat 3 in different directions to obtain the axial clearance of the ball screw in the positive and reverse directions. The workbench 1 is fixed with an air source device 85, a pressure regulating valve 86 and a pressure display 87. The gas pressure provided by the air source device 85 is adjusted by the pressure regulating valve 86, so that the cylinders of the left pressurized cylinder 81 and the right pressurized cylinder 82 are The pressure is adapted to the push and pull forces required for the working conditions of different types of ball screws; the measuring mechanism 4 includes a slide rail 41 fixed on the upper surface of the workbench 1, a slider 42 is slidably matched on the slide rail 41, a locking block 43 is fixed at the bottom of the slider 42, the locking block 43 is used to lock the slider 42, so that the slider 42 and the slide rail 41 are fixed, the upper end of the slider 42 is fixedly connected to the digital display 44, the detection head 45 at the front end of the digital display 44 extends into the elastic chuck 6 and abuts against the end of the screw 02, which is used to measure the axial movement distance of the screw 02, that is, the axial clearance. ;

[0018] Instructions for use: install the screw 02 of the matched ball screw in the elastic chuck 6, then shake the hand wheel 71 to adjust the movable plate 7 to move the screw mounting seat 3 to a suitable installation position, then place the nut 01 in the V-block 51, the right end face of the nut 01 abuts against the stopper 55, operate the cylinder clamp wrench 52 to make the cylinder clamp 53 press the left end of the nut 01, and complete the installation of the nut 01. At the same time, the chuck piece 62 of the elastic chuck 6 is installed in the chuck groove 31; then loosen the locking block 43, push the detection head 45 into the end face of the screw 02 of the test piece, ensure that the detection head 45 contacts the end face of the screw 02 and generates a preload, and then lock the locking block 43; finally, by turning the left Control handle 83 or right control handle 84, start corresponding cylinder for axial loading: control left pressurizing cylinder 81, make its piston rod abut against the left side of screw mounting seat 3 and reset digital display 44, then control piston rod of right pressurizing cylinder 82 to apply pressure from the right side of screw mounting seat 3, push screw 02 to move, at this time, the value displayed on digital display 44 is the positive axial clearance value of ball screw, if want to obtain reverse axial clearance value, first control right pressurizing cylinder 82, make its piston rod abut against the right side of screw mounting seat 3 and reset digital display 44, then control piston rod of left pressurizing cylinder 81 to apply pressure from the left side of screw mounting seat 3, push screw to move.

[0019] The protection scope of the present invention includes but is not limited to the above embodiments. The protection scope of the present invention shall be based on the claims. Any replacement, deformation, and improvement of the technology that can be easily thought of by technicians in this field shall fall within the protection scope of the present invention.

Claims

1. A ball screw axial clearance detection device dedicated to an EMB brake system, characterized in that: The invention comprises a workbench, on which a nut mounting seat, a screw mounting seat and a measuring mechanism are arranged in sequence from left to right, the nut mounting seat is fixed to the upper surface of the workbench, and a nut clamping mechanism is fixed to the nut mounting seat; a movable plate is slidably connected to the lower surface of the workbench, and a movable plate moving driving mechanism is arranged on the workbench, the screw mounting seat passes through the workbench and is slidably connected to the movable plate, a screw clamping mechanism is arranged on the screw mounting seat, and a bidirectional pressurizing pushing mechanism is fixed on the movable plate, wherein the pressurizing pushing mechanism in one direction is used for pushing the screw mounting seat to move rightward, and the pressurizing pushing mechanism in the other direction is used for pushing the screw mounting seat to move leftward; the detection head in the measuring mechanism abuts against the end of the screw, and is used for measuring the axial movement distance of the screw.

2. A ball screw axial clearance detection device dedicated to an EMB brake system as claimed in claim 1, characterized in that: The nut clamping mechanism includes a V-block, a cylinder clamp wrench and two relatively arranged cylinder clamps. The cylinder clamp wrench is fixed on the workbench and is used to control the start and stop of the cylinder clamp. The V-block is fixed on the horizontal plane of the nut mounting seat. The cylinder clamp is fixed on the vertical plane of the nut mounting seat through a gasket. Stop blocks are respectively fixed on the opposite sides of the two gaskets. The nut is placed in the V-block. After the right end face of the nut is against the stop block, the cylinder clamp is used to tighten the left end of the nut.

3. A ball screw axial clearance detection device dedicated to an EMB brake system as claimed in claim 1, characterized in that: A chuck groove is fixed on the upper end of the screw mounting seat for mounting the screw clamping mechanism, and pressure sensors are fixed on the left and right sides of the lower end of the screw mounting seat for detecting the pressure applied by the pressurizing pushing mechanism on the screw mounting seat.

4. A ball screw axial clearance detection device dedicated to an EMB brake system as claimed in claim 3, characterized in that: The screw clamping mechanism is an elastic chuck, and an adjustable screw fixing platform is fixed to the left end of the elastic chuck. The screw fixing platform is a semi-closed circular ring with a slot. After the screw is installed, the slot is locked by screws so that the screw is fixed in the screw fixing platform. The right end of the elastic chuck is integrally provided with a chuck plate that cooperates with the chuck slot.

5. The ball screw axial clearance detection device dedicated to the EMB brake system as claimed in claim 1, characterized in that: The movable plate movement driving mechanism includes a handwheel, a screw and a nut seat, the nut seat is fixed to the lower surface of the workbench, the screw is threadedly connected to the nut seat, the left end of the screw is rotatably connected to the movable plate, and the right end of the screw is fixedly connected to the handwheel, a sliding groove is opened on the movable plate, a connecting seat is slidably connected to the sliding groove, the screw mounting seat is fixed on the connecting seat, and the screw mounting seat slides in the sliding groove.

6. A ball screw axial clearance detection device dedicated to an EMB brake system as claimed in claim 1, characterized in that: A scale display device is provided on the upper surface of the workbench for displaying the stroke position of the ball screw during detection. The scale display device includes a scale, a pointer moving groove and a pointer. The scale and the pointer moving groove are provided on the workbench. The pointer passes through the workbench and is fixed on the moving plate. The pointer slides in the pointer moving groove.

7. A ball screw axial clearance detection device dedicated to an EMB brake system as claimed in claim 3, characterized in that: The pressurizing pushing mechanism includes a left control handle, a right control handle, and a left pressurizing cylinder and a right pressurizing cylinder that are relatively arranged. The left pressurizing cylinder and the right pressurizing cylinder are fixed on the lower surface of the movable plate and are located on the same straight line as the pressure sensor. The left control handle and the right control handle are fixed on the workbench. The left control handle is used to control the start and stop of the left pressurizing cylinder, and the right control handle is used to control the start and stop of the right pressurizing cylinder. Pulling the left control handle causes the piston rod of the left pressurizing cylinder to apply pressure to the left side of the screw mounting seat, and pulling the right control handle causes the piston rod of the right pressurizing cylinder to apply pressure to the right side of the screw mounting seat.

8. A ball screw axial clearance detection device dedicated to an EMB brake system as claimed in claim 7, characterized in that: An air source device, a pressure regulating valve and a pressure display are fixed on the workbench. The gas pressure provided by the air source device is adjusted by the pressure regulating valve so that the cylinder pressures of the left pressurized cylinder and the right pressurized cylinder are adapted to the push-pull force required for different types of ball screw working conditions.

9. A ball screw axial clearance detection device dedicated to an EMB brake system as claimed in claim 1, characterized in that: The measuring mechanism includes a slide rail fixed on the upper surface of the workbench, a slider is slidably fitted on the slide rail, a locking block is fixed to the bottom of the slider, the locking block is used to lock the slider so that the slider and the slide rail are fixed, a digital display is fixedly connected to the upper end of the slider, and a detection head of the digital display is against the end of the lead screw.

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