A vibration test device for the stability of a fixture of a numerically controlled machine tool

Abstract

The present invention relates to the technical field of machine tool fixture testing, and specifically to a vibration testing device for the stability of a CNC machine tool fixture, which includes a detection bed frame, a detection component and a braking component. By rotating the center-of-gravity adjustment screw rod in the counterweight assembly, the threaded thrust between the center-of-gravity adjustment screw rod and the inner threaded tube drives the two center-of-gravity adjustment sliders to move along the two straight grooves away from the test rod. The two center-of-gravity adjustment sliders further drive the two gravity weights to move together. At this time, the overall center of gravity of the counterweight assembly, the counterweight block and the test rod deviates from the center of the test rod, which will cause the right end of the test rod to vibrate. And by adjusting the moving distance of the inner threaded tube, the overall center-of-gravity position of the counterweight assembly, the counterweight block and the test rod can be adjusted. Thus, during the rotation of the test rod, different amplitudes of vibration will be generated at its right end, and the clamping stability of the CNC machine tool fixture can be tested under different vibration intensities, improving the detection range and detection intensity.

Description

Technical Field

[0001] The present invention relates to the technical field of machine tool fixture testing, and particularly to a vibration testing device for the stability of a numerical control machine tool fixture. Background Art

[0002] A numerical control machine tool, abbreviated as a CNC machine tool, is an automated machine tool equipped with a program control system. When machining parts on a CNC machine tool, it mainly depends on the processing program. It does not need to manufacture or replace many molds and fixtures, and does not need to frequently readjust the machine tool. Therefore, CNC machine tools are suitable for occasions where the machined parts are frequently changed, and the stability of the CNC machine tool fixture plays an important role in workpiece machining.

[0003] According to a Chinese patent with the application publication number CN117629560A, a stability testing device for a CNC machine tool fixture is disclosed. The convex block on the wedge rod frame continuously pushes the weight upwards, causing the weight to continuously hammer the test rod, simulating the stability of the clamping state of the test fixture during actual work. If the test rod shakes or deflects, the transmission rod will shake or move obliquely downwards, causing the heavy ball to roll off the limit plate under the action of gravity. The staff judges the stability of the test fixture when clamping the test rod by observing the state of the heavy ball, thereby completing the stability test of the test fixture in the clamping state. However, due to the possible uneven internal texture distribution of the workpiece itself, in fact, it is impossible to ensure that the center of gravity position of the workpiece coincides with the axis position during its rotation during the machining process. Therefore, the largest factor causing fixture vibration is the eccentric force factor during the rotation of the workpiece. The above-mentioned testing device cannot test the clamping effect of the vibration on the machine tool fixture when the workpiece rotates. For this reason, we propose a vibration testing device for the stability of a CNC machine tool fixture to solve the above technical problems. Summary of the Invention

[0004] The present invention provides the following technical solution: A vibration testing device for the stability of a numerical control machine tool fixture, including a detection bed frame, a detection component, and a braking component. The top of the detection bed frame is provided with a detection component. A rotating side seat is fixedly provided at the left end of the top of the detection bed frame. The top of the detection bed frame is provided with a braking component, and the braking component is located at the right part of the rotating side seat.

[0005] The detection component includes a driving shaft rotatably installed inside the rotating side seat. The right end of the driving shaft is fixedly installed with an adapter plate. The detection component further includes a test rod located at the right end of the adapter plate. A counterweight block and a counterweight assembly are fixedly installed on the outer wall of the right end of the test rod.

[0006] The counterweight assembly includes a U-shaped frame fixedly installed at the right end of the outer wall of the test rod. A center-of-gravity adjusting screw rod is rotatably installed inside the U-shaped frame. An internally threaded tube is threadedly connected to the periphery of the center-of-gravity adjusting screw rod. A center-of-gravity adjusting slider is fixedly installed on the outer wall of the internally threaded tube. A gravity weight is fixedly installed at the end of the center-of-gravity adjusting slider.

[0007] As a preferred solution of the present invention, the U-shaped frame and the counterweight are distributed on both sides of the center of the test rod. The number of the center-of-gravity adjusting sliders is two, and the two center-of-gravity adjusting sliders are symmetrically distributed about the center of the internally threaded tube. Straight grooves are formed through both inner walls of the U-shaped frame. The center-of-gravity adjusting sliders slide inside the straight grooves. The weight of the gravity weight is adapted to the weight of the counterweight.

[0008] As a preferred solution of the present invention, two vertically distributed pick-up frames are fixedly installed at the top left end and the top right end of the rotating side seat through channel steels. Two horizontally distributed sleeve shafts are rotatably installed between the two vertically distributed pick-up frames. Straight gears are fixedly installed on the outer walls of the two sleeve shafts located at the top left end of the detection bed frame. An annular gear sleeve is fixedly installed on the outer wall of the left end of the test rod. The annular gear sleeve meshes with the two straight gears. A pointer is fixedly installed on the outer wall of one of the sleeve shafts. The pointer is located at the bottom of the straight gear. A scale is fixedly installed on the surface of one of the pick-up frames located at the top left end of the detection bed frame. The scale is located at the bottom of the pointer, and the position of the pointer corresponds to the scale position opened at the top of the scale.

[0009] As a preferred solution of the present invention, a power motor is fixedly installed at the bottom left end of the detection bed frame. A driving sheave is fixedly installed on the output shaft of the power motor. A driven sheave is fixedly installed on the outer wall of the left end of the driving shaft. At least one V-belt is sleeved between the driving sheave and the driven sheave.

[0010] As a preferred solution of the present invention, the braking component includes inserting rods slidably inserted into the top inner wall and the bottom inner wall of the sleeve shaft. A suspension arm is fixedly installed at one end of the inserting rod away from the sleeve shaft. The two suspension arms in the vertical position are symmetrically distributed, and the two suspension arms in the horizontal position are symmetrically distributed. A braking pressing plate is fixedly installed between the two left and right suspension arms. A plurality of braking strips are fixedly installed between the two front and rear braking pressing plates at equal intervals in the left-right direction.

[0011] As a preferred solution of the present invention, the braking strips are riveted to the surface of the braking pressing plate, and the braking strips are made of cotton and linen materials.

[0012] As a preferred embodiment of the present invention, two tension springs distributed left and right are fixedly installed between the two braking pressure plates in the up-down direction. Anti-slip pins are fixedly installed at the ends of the outer walls of the insertion rods far from the boom. Ring grooves are provided at the top and bottom of the sleeve shaft. Vertical grooves are provided in the upper and lower outer walls of the sleeve shaft. The vertical grooves communicate with the ring grooves. The width of the vertical grooves is greater than the diameter of the anti-slip pins, and the anti-slip pins are located inside the ring grooves. The positions of the anti-slip pins do not coincide with the positions of the vertical grooves.

[0013] As a preferred embodiment of the present invention, rocker arms are fixedly installed on the upper outer walls of the sleeve shafts. A pull rod is jointly hinged between the two rocker arms at the left and right positions.

[0014] As a preferred embodiment of the present invention, the distance between the inner wall of the picket and the outer wall of the test rod is 50 - 60 mm. The distance between the outer wall of the test rod and the outer wall of the sleeve shaft is 50 - 60 mm. The distance between the tension spring and the test rod is 50 - 60 mm.

[0015] As a preferred embodiment of the present invention, the annular gear sleeve is sleeved around the test rod, and the annular gear sleeve is fixed to the test rod through fastening bolts.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0017] 1. In the present invention, by rotating the center-of-gravity adjustment screw rod in the counterweight assembly, the threaded thrust between the center-of-gravity adjustment screw rod and the inner threaded tube drives the two center-of-gravity adjustment sliders to move away from the test rod along the two straight grooves. The two center-of-gravity adjustment sliders further drive the two gravity weights to move together. At this time, the overall center of gravity of the counterweight assembly, the counterweight block and the test rod deviates from the center of the test rod, which will cause the right end of the test rod to vibrate. And by adjusting the moving distance of the inner threaded tube, the position of the overall center of gravity of the counterweight assembly, the counterweight block and the test rod can be adjusted. Thus, during the rotation of the test rod, different amplitudes of vibration will be generated at its right end. The clamping stability of the CNC machine tool fixture can be tested according to different vibration intensities, improving the detection range and detection intensity.

[0018] 2. In the present invention, the vibration at the right end of the test rod will cause the test rod to shift inside the jaws of the fixture. The shift of the test rod directly drives the annular gear sleeve to move. The movement of the annular gear sleeve drives the two spur gears and the sleeve shaft fixedly connected to the spur gears to rotate. The rotation of one of the sleeve shafts also drives the pointer to rotate, causing a deviation between the pointer and the scale reference position of the scale. The inspector can know whether the test rod has moved by observing the position of the pointer and the scale of the scale, and then can judge the clamping stability effect of the CNC machine tool fixture, which is highly practical.

[0019] 3. In the present invention, when the displacement of the test rod is relatively large, since the movement of the test rod drives the movement of the annular gear sleeve, the spur gear and the sleeve shaft connected to the spur gear rotate. The rotation of the sleeve shaft drives the rotation of the two sleeve shafts at the right end through the linkage of the left and right rocker arms and the pull rod. The rotation of the sleeve shaft drives the ring groove and the vertical groove to rotate together. When the vertical groove rotates to overlap with the position of the anti-slip pin, the abutting force of the ring groove wall on the anti-slip pin disappears, and the two tension springs in the compressed state immediately rebound, causing the upper and lower brake pressing plates to move towards the middle. The movement of the brake pressing plates drives the lifting arm to move together. The movement of the lifting arm drives the insertion rod to slide into the interior of the sleeve shaft. The lifting arm further drives the anti-slip pin to slide along the inner wall of the vertical groove until the upper and lower brake pressing plates abut against each other, stretching the brake strips distributed up and down to cover the periphery of the test rod. At the same time, the power motor is powered off, and multiple test rods tightly cover the periphery of the test rod, which can quickly brake the rotating test rod, quickly change it from dynamic rotation to static, prevent the test rod from falling off the numerical control machine tool fixture, reduce the probability of detection safety accidents, and improve the detection safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic structural view of the right front perspective of the present invention;

[0021] Figure 2 is a schematic structural view of the left front perspective of the present invention;

[0022] Figure 3 is a schematic structural view of the detection component and the braking component in the present invention;

[0023] Figure 4 is a schematic structural view of the left front perspective of the braking component in the present invention;

[0024] Figure 5 is a schematic structural view of the right front perspective of the braking component in the present invention;

[0025] Figure 6 is a schematic detailed structural view of the test rod in the present invention;

[0026] Figure 7 In the present invention Figure 6 is an enlarged schematic structural view of part A;

[0027] Figure 8 is a schematic detailed structural view of the braking component in the present invention;

[0028] Figure 9 is a schematic detailed structural view of the sleeve shaft in the present invention;

[0029] Figure 10 is a schematic structural view of the anti-slip pin in the present invention;

[0030] Figure 11 In the present invention Figure 8Schematic diagram of the enlarged structure of part B.

[0031] In the figure: 100, detection bed frame; 101, rotating side seat; 102, picking frame; 200, detection component; 201, drive shaft; 202, connecting disk; 203, test rod; 204, counterweight; 205, U-shaped frame; 206, center of gravity adjustment screw rod; 207, internal thread tube; 208, center of gravity adjustment slider; 209, gravity weight; 2010, straight groove; 2011, annular gear sleeve; 2012, sleeve shaft; 2013, spur gear; 2014, pointer; 2015, scale disk; 300, braking component; 301, insertion rod; 302, boom; 303, braking pressure plate; 304, braking strip; 306, anti-slip pin; 307, annular groove; 308, vertical groove; 309, pulling spring; 400, rocker arm; 500, pull rod; 600, power motor; 601, driving sheave; 602, driven sheave; 603, V-belt. Specific implementation mode

[0032] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0033] Please refer to Figures 1 - 11 , the technical solutions provided by the present invention specifically include the following embodiments:

[0034] Embodiment 1: A vibration test device for the stability of a CNC machine tool fixture, including a detection bed frame 100, a detection component 200 and a braking component 300. A detection component 200 is provided on the top of the detection bed frame 100. A rotating side seat 101 is fixedly provided at the left end of the top of the detection bed frame 100. A braking component 300 is provided on the top of the detection bed frame 100, and the braking component 300 is located at the right part of the rotating side seat 101;

[0035] The detection component 200 includes a drive shaft 201 rotatably installed inside the rotating side seat 101. A connecting disk 202 is fixedly installed at the right end of the drive shaft 201. The detection component 200 further includes a test rod 203 located at the right end of the connecting disk 202. A counterweight 204 and a counterweight assembly are fixedly installed on the outer wall of the right end of the test rod 203. The counterweight assembly includes a U-shaped frame 205 fixedly installed on the outer wall of the right end of the test rod 203. A center of gravity adjustment screw rod 206 is rotatably installed inside the U-shaped frame 205. An internal thread tube 207 is screwed on the periphery of the center of gravity adjustment screw rod 206. A center of gravity adjustment slider 208 is fixedly installed on the outer wall of the internal thread tube 207. A gravity weight 209 is fixedly installed at the end of the center of gravity adjustment slider 208;

[0036] The U-shaped frame 205 and the counterweight 204 are distributed on both sides of the center of the test rod 203. There are two center-of-gravity adjustment sliders 208, and the two center-of-gravity adjustment sliders 208 are symmetrically distributed about the center of the inner-threaded tube 207. Straight grooves 2010 are formed through both inner walls of the U-shaped frame 205, and the center-of-gravity adjustment sliders 208 are slidably located inside the straight grooves 2010. The weight of the gravity weight 209 is adapted to the weight of the counterweight 204;

[0037] At the left end and the right end of the top of the rotating side seat 101, two vertically distributed pick-up frames 102 are fixedly installed through channel steels. Two horizontally distributed sleeve shafts 2012 are rotatably installed between the two vertically distributed pick-up frames 102. Outer walls of the two sleeve shafts 2012 located at the left end of the top of the detection bed frame 100 are fixedly installed with spur gears 2013. An annular gear sleeve 2011 is fixedly installed on the outer wall of the left end of the test rod 203. The annular gear sleeve 2011 meshes with the two spur gears 2013. A pointer 2014 is fixedly installed on the outer wall of one of the sleeve shafts 2012. The pointer 2014 is located at the bottom of the spur gear 2013. A scale plate 2015 is fixedly installed on the surface of one of the pick-up frames 102 located at the left end of the top of the detection bed frame 100. The scale plate 2015 is located at the bottom of the pointer 2014, and the position of the pointer 2014 corresponds to the scale position formed at the top of the scale plate 2015;

[0038] A power motor 600 is fixedly provided at the left end of the bottom of the detection bed frame 100. A driving sheave 601 is fixedly installed on the output shaft of the power motor 600. A driven sheave 602 is fixedly installed on the outer wall of the left end of the driving shaft 201. At least one V-belt 603 is sleeved jointly between the driving sheave 601 and the driven sheave 602;

[0039] Specifically in this embodiment, the CNC machine tool fixture to be detected is fixedly installed on the right side of the connecting disk 202, and the left end of the test rod 203 is clamped by the jaws of the CNC machine tool fixture installed at the right end of the connecting disk 202 (as shown in the Figure 1 appendix 2 of the specification);

[0040] Start the power motor 600, and drive the driving sheave 601 to rotate through the output shaft of the power motor 600. The rotation of the driving sheave 601 drives the driven sheave 602 together with the drive shaft 201, the connecting disk 202 and the fixed CNC machine tool fixture to rotate through the V-belt 603. The rotation of the CNC machine tool fixture drives the test rod 203 clamped by it to rotate together. The rotation of the test rod 203 drives the annular gear sleeve 2011 to rotate. It should be noted here that before starting the power motor 600, it is necessary to pre-apply grease to the surfaces of the annular gear sleeve 2011 and the spur gear 2013 to avoid frictional loss between the annular gear sleeve 2011 and the spur gear 2013, which can extend the service life of the annular gear sleeve 2011 and the spur gear 2013. Since the rotation of the test rod 203 also drives the counterweight 204 and the counterweight assembly to rotate. Initially, the inner threaded tube 207 in the counterweight assembly is located at one end of the gravity adjustment screw rod 206 near the test rod 203 and outside the gravity adjustment screw rod 206. In this case, during the rotation of the test rod 203, the overall center of gravity of the counterweight 204, the counterweight assembly and the test rod 203 is located at the center of the circle of the test rod 203, ensuring that the test rod 203 does not swing during rotation, and detecting the clamping stability of the CNC machine tool fixture. At the same time, this device can rotate the gravity adjustment screw rod 206, so that the threaded thrust between the gravity adjustment screw rod 206 and the inner threaded tube 207 drives the two gravity adjustment sliders 208 to move along the two straight grooves 2010 away from the test rod 203. The two gravity adjustment sliders 208 further drive the two gravity weights 209 to move together. At this time, the overall center of gravity of the counterweight assembly, the counterweight 204 and the test rod 203 deviates from the center of the circle of the test rod 203. Therefore, when the test rod 203 is rotating, it is unbalanced, which will cause the right end of the test rod 203 to vibrate. And by adjusting the moving distance of the inner threaded tube 207, the overall center of gravity position of the counterweight assembly, the counterweight 204 and the test rod 203 can be adjusted. Thus, during the rotation of the test rod 203, different amplitudes of vibration are generated at its right end. According to different vibration intensities, the clamping stability of the CNC machine tool fixture can be tested, improving the detection range and detection intensity. If the clamping force of the fixture of the CNC machine is not good, due to the vibration at the right end of the test rod 203, the test rod 203 will shift inside the jaws of the fixture. The shift of the test rod 203 directly drives the annular gear sleeve 2011 to move. The movement of the annular gear sleeve 2011 drives the two spur gears 2013 together with the sleeve shaft 2012 fixedly connected to the spur gears 2013 to rotate. The rotation of one of the sleeve shafts 2012 also drives the pointer 2014 to rotate, causing a deviation between the pointer 2014 and the scale reference position of the scale disk 2015. The inspector can know whether the test rod 203 has moved by observing the scale position of the pointer 2014 and the scale disk 2015, and then can judge the clamping stability effect of the CNC machine tool fixture, which is highly practical.

[0041] Embodiment 2: The braking component 300 includes plug rods 301 that are slidably inserted into the top inner wall and the bottom inner wall of the sleeve shaft 2012. A suspension arm 302 is fixedly installed at one end of the outer wall of the plug rod 301 away from the sleeve shaft 2012. Among them, the two suspension arms 302 in the up-and-down positions are symmetrically distributed, and the two suspension arms 302 in the left-and-right positions are symmetrically distributed. A braking pressure plate 303 is fixedly installed between the two suspension arms 302 on the left and right. A plurality of braking strips 304 are fixedly installed between the two braking pressure plates 303 in the front and back and are equally spaced left and right. The braking strips 304 are riveted to the surface of the braking pressure plate 303, and the braking strips 304 are made of cotton and linen materials;

[0042] Two pulling springs 309 are fixedly installed between the two braking pressure plates 303 in the up-and-down direction. Anti-slip pins 306 are fixedly installed at one ends of the outer walls of the plug rods 301 away from the suspension arms 302. Ring grooves 307 are provided at the top and bottom of the sleeve shaft 2012. Vertical grooves 308 are provided on the upper part and the lower part of the outer wall of the sleeve shaft 2012. The vertical grooves 308 communicate with the ring grooves 307. The groove width of the vertical grooves 308 is greater than the diameter of the anti-slip pins 306, and the anti-slip pins 306 are located inside the ring grooves 307. The positions of the anti-slip pins 306 do not coincide with the positions of the vertical grooves 308;

[0043] Rocking arms 400 are fixedly installed on the upper part of the outer wall of the sleeve shaft 2012. A pull rod 500 is jointly hinged between the two rocking arms 400 in the left-and-right positions;

[0044] Specifically in this embodiment, during the detection of the fixture of the numerically controlled machine tool by this device, when the displacement of the test rod 203 is relatively large, since the movement of the test rod 203 drives the movement of the annular gear sleeve 2011, the spur gear 2013 and the sleeve shaft 2012 connected to the spur gear 2013 rotate. The rotation of the sleeve shaft 2012 drives the rotation of the ring groove 307 and the vertical groove 308 through the linkage of the two rocker arms 400 on the left and right and the pull rod 500, driving the rotation of the two sleeve shafts 2012 at the right end. The rotation of the sleeve shaft 2012 drives the ring groove 307 and the vertical groove 308 to rotate together. When the vertical groove 308 rotates to overlap with the position of the anti-slip pin 306, the abutting force of the wall of the ring groove 307 on the anti-slip pin 306 disappears, and the two pulling springs 309 in the compressed state immediately rebound, causing the upper and lower brake pressing plates 303 to move towards the middle. The movement of the brake pressing plate 303 drives the movement of the lifting arm 302 together. The movement of the lifting arm 302 drives the insertion rod 301 to slide into the interior of the sleeve shaft 2012. The lifting arm 302 further drives the anti-slip pin 306 to slide along the inner wall of the vertical groove 308 until the upper and lower brake pressing plates 303 abut against each other, and the braking strips 304 distributed up and down are stretched to wrap around the periphery of the test rod 203. At the same time, the power motor 600 is powered off, and multiple test rods 203 are tightly wrapped around the periphery of the test rod 203, which can quickly brake the rotating test rod 203, quickly change it from dynamic rotation to static, prevent the test rod 203 from falling off the fixture of the numerically controlled machine tool, reduce the probability of detection safety accidents, and improve the detection safety.

[0045] Embodiment Three: The distance between the inner wall of the picket 102 and the outer wall of the test rod 203 is 50 - 60 mm, the distance between the outer wall of the test rod 203 and the outer wall of the sleeve shaft 2012 is 50 - 60 mm, and the distance between the pulling spring 309 and the test rod 203 is 50 - 60 mm;

[0046] Specifically in this embodiment, since there is a 50 - 60 mm gap between the outer wall of the test rod 203 and the picket 102, the sleeve shaft 2012, and the pulling spring 309, during the rotation of the test rod 203, if there is an amplitude swing at its right end, it will not come into contact and collision with the outer wall of the picket 102, the outer wall of the sleeve shaft 2012, and the outer wall of the pulling spring 309, avoiding damage to the device.

[0047] Embodiment Four: The annular gear sleeve 2011 is sleeved on the periphery of the test rod 203, and the annular gear sleeve 2011 is fixed to the test rod 203 through fastening bolts;

[0048] Specifically in this embodiment, by setting the fastening bolts, the straight groove 2010 is fixedly installed on the outer wall of the test rod 203, facilitating the adjustment of the position of the annular gear sleeve 2011, thereby facilitating the adjustment of numerically controlled machine tool fixtures of different thickness specifications and improving the adaptation range of the device.

[0049] When a vibration test device for the stability of a CNC machine tool fixture in this solution is working, the CNC machine tool fixture to be detected is fixedly installed on the right side of the connection disk 202, and the left end of the test rod 203 is clamped by the jaws of the CNC machine tool fixture installed at the right end of the connection disk 202 (as shown in the Figure 1 appendix 2 of the specification);

[0050] Start the power motor 600. The output shaft of the power motor 600 drives the active sheave 601 to rotate. The rotation of the active sheave 601 drives the driven sheave 602 together with the drive shaft 201, the connection disk 202 and the fixed CNC machine tool fixture to rotate through the V-belt 603. The rotation of the CNC machine tool fixture drives the test rod 203 clamped by it to rotate together. The rotation of the test rod 203 drives the annular gear sleeve 2011 to rotate. It should be noted here that before the power motor 600 is started, it is necessary to pre-apply grease to the surfaces of the annular gear sleeve 2011 and the spur gear 2013 to avoid friction loss between the annular gear sleeve 2011 and the spur gear 2013, which can improve the service life of the annular gear sleeve 2011 and the spur gear 2013. Since the rotation of the test rod 203 also drives the counterweight 204 and the counterweight assembly to rotate together. At first, the inner threaded tube 207 in the counterweight assembly is located at one end of the gravity adjustment lead screw 206 near the test rod 203. In this case, during the rotation of the test rod 203, the overall center of gravity of the counterweight 204, the counterweight assembly and the test rod 203 is located at the center of the circle of the test rod 203, ensuring that the test rod 203 does not swing during rotation, and detecting the clamping stability of the CNC machine tool fixture. At the same time, in this device, by rotating the gravity adjustment lead screw 206, the threaded thrust between the gravity adjustment lead screw 206 and the inner threaded tube 207 drives the two gravity adjustment sliders 208 to move along the two straight grooves 2010 away from the test rod 203. The two gravity adjustment sliders 208 further drive the two gravity weights 209 to move together. At this time, the overall center of gravity of the counterweight assembly, the counterweight 204 and the test rod 203 deviates from the center of the circle of the test rod 203. Therefore, the test rod 203 is unbalanced during rotation, which will cause the right end of the test rod 203 to vibrate. And by adjusting the moving distance of the inner threaded tube 207, the overall center of gravity position of the counterweight assembly, the counterweight 204 and the test rod 203 can be adjusted, so that during the rotation of the test rod 203, different amplitudes of vibration are generated at its right end;

[0051] When the clamping force of the fixture of the CNC machine tool is not good, due to the vibration at the right end of the test rod 203, the test rod 203 will shift inside the jaws of the fixture. The shift of the test rod 203 directly drives the movement of the annular gear sleeve 2011. The movement of the annular gear sleeve 2011 drives the rotation of the two spur gears 2013 together with the sleeve shafts 2012 fixedly connected to the spur gears 2013. The rotation of one of the sleeve shafts 2012 also drives the rotation of the pointer 2014, causing a deviation between the pointer 2014 and the scale reference position of the scale disk 2015. The inspector can know whether the test rod 203 has moved by observing the scale position of the pointer 2014 and the scale disk 2015, and then can judge the clamping stability effect of the fixture of the CNC machine tool;

[0052] During the detection of the fixture of the CNC machine tool by this device, when the displacement of the test rod 203 is large, since the movement of the test rod 203 drives the movement of the annular gear sleeve 2011, it causes the rotation of the spur gear 2013 and the sleeve shaft 2012 connected to the spur gear 2013. The rotation of the sleeve shaft 2012 drives the rotation of the ring groove 307 and the vertical groove 308 through the linkage of the left and right rocker arms 400 and the pull rod 500. When the vertical groove 308 rotates to overlap with the position of the anti-slip pin 306, the abutting force of the wall of the ring groove 307 on the anti-slip pin 306 disappears. The two pulling springs 309 in the compressed state immediately rebound, causing the upper and lower brake pressing plates 303 to move towards the middle. The movement of the brake pressing plates 303 drives the movement of the lifting arm 302 together. The movement of the lifting arm 302 drives the insertion rod 301 to slide into the inside of the sleeve shaft 2012. The lifting arm 302 further drives the anti-slip pin 306 to slide along the inner wall of the vertical groove 308 until the upper and lower brake pressing plates 303 abut against each other. The stretching brake strips 304 distributed up and down are wrapped around the periphery of the test rod 203. At the same time, the power motor 600 is powered off, and multiple test rods 203 are tightly wrapped around the periphery of the test rod 203, which can quickly brake the rotating test rod 203, making it quickly change from dynamic rotation to static, preventing the test rod 203 from falling off the fixture of the CNC machine tool, reducing the probability of detection safety accidents, and improving the detection safety.

[0053] Although the embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made in these embodiments without departing from the principles and spirit of the present invention.

Claims

1. A vibration test device for the stability of a CNC machine tool fixture, comprising a detection bed frame (100), a detection component (200) and a braking component (300), characterized in that: A detection component (200) is provided on the top of the detection bed frame (100); a rotating side seat (101) is fixedly provided on the left end of the top of the detection bed frame (100); a braking component (300) is provided on the top of the detection bed frame (100); and the braking component (300) is located on the right part of the rotating side seat (101); The detection component (200) comprises a driving shaft (201) rotatably mounted inside a rotating side seat (101), a connecting plate (202) being fixedly mounted on the right end of the driving shaft (201), and the detection component (200) further comprises a testing rod (203) located at the right end of the connecting plate (202), a counterweight block (204) and a counterweight assembly being fixedly mounted on the right end of the outer wall of the testing rod (203); The counterweight assembly comprises a U-shaped frame (205) fixedly mounted on the right end of the outer wall of the test rod (203); a center of gravity adjustment screw rod (206) is rotatably mounted inside the U-shaped frame (205); an inner threaded tube (207) is screwed onto the outer thread of the center of gravity adjustment screw rod (206); a center of gravity adjustment slider (208) is fixedly mounted on the outer wall of the inner threaded tube (207); and a gravity weight (209) is fixedly mounted on the end of the center of gravity adjustment slider (208).

2. A CNC machine tool fixture stability vibration test device according to claim 1, characterized in that: The U-shaped frame (205) and the counterweight (204) are distributed on both sides of the center of the test rod (203). There are two center of gravity adjustment sliders (208), and the two center of gravity adjustment sliders (208) are symmetrically distributed about the center of the inner wire tube (207). Straight grooves (2010) are penetrated through the inner walls of both sides of the U-shaped frame (205). The center of gravity adjustment sliders (208) are slidably located inside the straight grooves (2010). The weight of the gravity weight (209) is adapted to the weight of the counterweight (204).

3. A CNC machine tool fixture stability vibration test device according to claim 2, characterized in that: The top left end and the top right end of the rotating side seat (101) are both fixedly mounted with two vertically distributed cantilever frames (102) via channel steel, and two front-to-rear distributed sleeve shafts (2012) are rotatably mounted between the two vertically distributed cantilever frames (102), wherein the outer walls of the two sleeve shafts (2012) located at the top left end of the detection bed frame (100) are both fixedly mounted with spur gears (2013), and the left end of the outer wall of the test rod (203) is fixedly mounted with an annular gear sleeve (2011), and the annular gear sleeve (2011) ) are meshed with two spur gears (2013), a pointer (2014) is fixedly mounted on the outer wall of one of the sleeve shafts (2012), and the pointer (2014) is located at the bottom of the spur gear (2013), and a dial (2015) is fixedly mounted on the surface of one of the cantilever frames (102) located at the top left end of the detection bed frame (100), and the dial (2015) is located at the bottom of the pointer (2014), and the position of the pointer (2014) corresponds to the scale position opened at the top of the dial (2015).

4. A CNC machine tool fixture stability vibration test device according to claim 3, characterized in that: A power motor (600) is fixedly mounted on the left end of the bottom of the detection bed frame (100); a driving groove wheel (601) is fixedly mounted on the output shaft of the power motor (600); a driven groove wheel (602) is fixedly mounted on the left end of the outer wall of the drive shaft (201); and at least one V-belt (603) is sleeved between the driving groove wheel (601) and the driven groove wheel (602).

5. A CNC machine tool fixture stability vibration test device according to claim 4, characterized in that: The brake component (300) comprises an insertion rod (301) slidably inserted into the top of the inner wall of the sleeve shaft (2012) and slidably inserted into the bottom of the inner wall of the sleeve shaft (2012); a suspension arm (302) is fixedly installed at one end of the outer wall of the insertion rod (301) away from the sleeve shaft (2012); the two suspension arms (302) at upper and lower positions are symmetrically distributed, and the two suspension arms (302) at left and right positions are symmetrically distributed; a brake pressure plate (303) is fixedly installed between the left and right suspension arms (302); and a plurality of brake strips (304) distributed at equal intervals on the left and right are fixedly installed between the front and rear brake pressure plates (303).

6. A CNC machine tool fixture stability vibration test device according to claim 5, characterized in that: The brake strip (304) is riveted to the surface of the brake pressure plate (303) by means of rivets, and the brake strip (304) is made of cotton and linen material.

7. A CNC machine tool fixture stability vibration test device according to claim 6, characterized in that: Two pulling springs (309) distributed left and right are fixedly installed between the two brake pressure plates (303) in the upper and lower directions; an anti-slip pin (306) is fixedly installed on the end of the outer wall of the insertion rod (301) away from the suspension arm (302); an annular groove (307) is provided at the top and bottom of the sleeve shaft (2012); a vertical groove (308) is provided at the upper part of the outer wall of the sleeve shaft (2012) and the lower part of the outer wall; the vertical groove (308) is connected to the annular groove (307); the groove width of the vertical groove (308) is greater than the diameter of the anti-slip pin (306); the anti-slip pin (306) is located inside the annular groove (307); and the position of the anti-slip pin (306) does not overlap with the position of the vertical groove (308).

8. A CNC machine tool fixture stability vibration test device according to claim 7, characterized in that: A rocker arm (400) is fixedly mounted on the upper portion of the outer wall of the sleeve shaft (2012), wherein a pull rod (500) is hingedly connected between two rocker arms (400) at left and right positions.

9. A CNC machine tool fixture stability vibration test device according to claim 8, characterized in that: The distance between the inner wall of the support frame (102) and the outer wall of the test rod (203) is 50 to 60 mm, the distance between the outer wall of the test rod (203) and the outer wall of the sleeve shaft (2012) is 50 to 60 mm, and the distance between the pulling spring (309) and the test rod (203) is 50 to 60 mm.

10. A CNC machine tool fixture stability vibration test device according to claim 9, characterized in that: The annular gear sleeve (2011) is sleeved on the periphery of the test rod (203), and the annular gear sleeve (2011) is fixed to the test rod (203) via fastening bolts.

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