An efficient vibration testing method for angle grinders

Abstract

The present invention relates to a high-efficiency angle grinder vibration test method. The specific steps include: S1, positioning the angle grinder vibration test equipment; S2, positioning the angle grinder and horizontally positioning the angle grinder on the angle grinder vibration test equipment; S3, starting the angle grinder. Under the no-load operating condition of the angle grinder, the vibration signals at each measuring point position are collected by a triaxial acceleration sensor, and the collected time-domain data is analyzed and calculated through the dynamic test analysis platform software and displayed; S4, the angle grinder vibration test equipment drives the angle grinder to move uniformly in the horizontal direction to realize the vibration test at each measuring point position of the grinder under the grinding working condition; S5, the angle grinder vibration test equipment drives the angle grinder to move uniformly in the horizontal direction to realize the vibration test at each measuring point position of the grinder under the cutting working condition. The present invention has the following advantages: It changes the traditional arm vibration test method and avoids the influence on the test accuracy caused by uncontrollable factors such as the arm grasping posture, grasping force, and grasping position during the test.

Description

Technical Field

[0001] The present invention belongs to the field of angle grinder testing, and particularly relates to a high-efficiency angle grinder vibration testing method. Background Art

[0002] An electric angle grinder includes components such as a gear pair, a rotor, a stator, bearings, a gearbox, and a housing. When rotating at high speed, the collision between components generates significant noise and vibration. As a frequently used electric tool, when using an electric angle grinder for processing, the mechanical vibration generated by the rotor system of the transmission device will cause local vibration of the machine body when the contact frequency occurs. When the vibration frequency of the electric angle grinder matches or is close to the natural vibration frequency of various parts of the human body, it will cause resonance of the machine body. Therefore, vibration testing during the processing of the angle grinder is an important test index for evaluating the performance of the angle grinder.

[0003] The vibration testing of an electric angle grinder generally takes the main and auxiliary handles of the angle grinder and the operator's arm as the research object, conducts vibration testing of the main and auxiliary handles, and experimentally studies the vibration transfer characteristics of the arm under different working conditions through a method combining experiments and theoretical analysis. During testing, triaxial acceleration sensors are installed at various measuring points on the arm, and the vibration signals collected by the triaxial acceleration sensors are analyzed and calculated for the time-domain data collected under different working conditions through dynamic test analysis platform software.

[0004] The existing vibration testing has the following technical defects: An electric angle grinder generally has three working conditions: idling, grinding, and cutting. Vibration testing is carried out by installing triaxial acceleration sensors on the operator's arm, and there are certain errors in the testing. Especially when switching between the two working conditions of grinding and cutting, there are significant changes in the way of holding the arm. For example, during grinding, the main handle and the auxiliary handle are perpendicular to each other in the horizontal direction, and both arms grasp the main and auxiliary handles downward at the same time. During cutting, the main handle and the auxiliary handle are perpendicular to each other in the vertical direction, and at this time, both arms grasp the main and auxiliary handles towards each other. Therefore, there are certain uncontrollable factors in the grasping posture, grasping force, and grasping position of the arm, so the vibration testing error is relatively large. Summary of the Invention

[0005] The purpose of the present invention is to overcome the above deficiencies, provide a high-efficiency angle grinder vibration testing method, change the traditional arm vibration testing method, and avoid influencing the testing accuracy due to uncontrollable factors such as the arm grasping posture, grasping force, and grasping position during the testing process when switching working conditions.

[0006] The purpose of the present invention is achieved through the following technical solutions: A high-efficiency angle grinder vibration testing method, the specific steps include,

[0007] S1. Positioning the angle grinder vibration test equipment, which includes a flip-type main handle test group and a flip-type auxiliary handle test group, both of which are equipped with a triaxial acceleration sensor;

[0008] S2. Position the angle grinder horizontally on the angle grinder vibration test equipment. The flip-type main handle test group clamps and fixes the main handle of the angle grinder. The flip-type secondary handle test group clamps and fixes the secondary handle of the angle grinder.

[0009] S3. The angle grinder is started. When the angle grinder is idling, the three-axis acceleration sensor collects vibration signals at each measuring point. The collected time domain data is analyzed, calculated, and displayed using the dynamic test analysis platform software.

[0010] S4. The angle grinder stops, and the angle grinder vibration test device moves downward as a whole so that the grinding disc of the angle grinder is in close contact with the surface of the workpiece to be processed. The grinder starts, and the angle grinder vibration test device drives the angle grinder to move horizontally at a uniform speed to achieve vibration testing of each measuring point of the grinder under the grinding condition;

[0011] S5. The angle grinder stops, the flip-type auxiliary handle test group releases the clamping of the auxiliary handle of the angle grinder and withdraws from the auxiliary handle of the angle grinder. The flip-type main handle test group flips 90° away from the auxiliary handle. At this time, the grinding disc of the angle grinder is perpendicular to the workpiece to be processed, and the auxiliary handle of the angle grinder is vertically set in front of the main handle. The flip-type auxiliary handle test group flips 90° in the direction of the auxiliary handle, and lifts and clamps it in the direction of the auxiliary handle. The grinder starts, and the angle grinder vibration test equipment drives the angle grinder to move at a uniform speed in the horizontal direction to realize the vibration test of each measuring point position of the grinder under the cutting condition.

[0012] A further improvement of the present invention is that the angle grinder vibration testing equipment also includes a fixed frame, telescopic legs placed on both sides of the fixed frame, and a sliding plate that moves horizontally back and forth in the fixed frame. The flip-type main handle test group and the flip-type auxiliary handle test group are fixed on the lower end surface of the sliding plate, and the lower side of the sliding plate has a platform to be processed.

[0013] A further improvement of the present invention is that: the fixed frame is a rectangular frame structure, the two side ends of the sliding plate are embedded in the fixed frame, and a transmission screw and a limit rod are horizontally distributed in sequence through the fixed frame and the sliding plate. The transmission screw is threaded with the sliding plate, the extension direction of the transmission screw is consistent with the moving direction of the sliding plate, the limit rod is gap-matched with the sliding plate, and the outside of the fixed frame is provided with a motor connected to the transmission screw.

[0014] A further improvement of the present invention lies in that: both the flip - type main handle test group and the flip - type sub - handle test group include a fixed base arranged on the lower end surface of the sliding disk and a vertical flipping group. The end of the vertical flipping group is connected to a first electric push rod, and the driving end of the first electric push rod is connected to a support connection seat. One end of the support connection seat away from the first electric push rod has finger - type jaws, and the triaxial acceleration sensor is fixedly arranged on the corresponding finger - type jaws;

[0015] When the sub - handle is perpendicular to the main handle in the horizontal direction, the clamping directions of the two finger - type jaws are perpendicular to each other; when the sub - handle is perpendicular to the main handle in the vertical direction, the two finger - type jaws are arranged facing each other under the vertical flipping of the corresponding vertical flipping group.

[0016] A further improvement of the present invention lies in that: the vertical flipping group includes a second electric push rod fixedly arranged on the lower end surface of the fixed base and a U - shaped base fixedly arranged on the lower end surface of the sliding disk. The opening of the U - shaped base is downward. The driving end of the second electric push rod horizontally extends towards the U - shaped base with a U - shaped pulling block. The opening of the U - shaped pulling block faces the direction of the U - shaped base, and both side ends of the U - shaped pulling block cover the U - shaped base. Both sides of the U - shaped base have slots for the two ends of the U - shaped pulling block to be horizontally embedded. When the second electric push rod jacks up, it drives the U - shaped pulling block to make a horizontal reciprocating movement in the slots. There is a strip - shaped through - hole one in the slots. An activity connection block is hinged in the U - shaped base. The activity connection block is movably hinged to the U - shaped base through a first connection shaft rod. One end of the activity connection block has a strip - shaped through - hole two. A second connection shaft rod passes through the end of the U - shaped pulling block, the strip - shaped through - hole one, and the strip - shaped through - hole two. The other end of the activity connection block is fixedly connected to a flipping block. The flipping block is placed outside the U - shaped base. The first electric push rod is placed between the flipping block and the support connection seat.

[0017] A further improvement of the present invention lies in that: the first connection shaft rod is located below the second connection shaft rod;

[0018] When the second electric push rod contracts, the U - shaped pulling block is placed at one end of the U - shaped base close to the fixed base. At this time, the flipping block is placed beside the U - shaped base, and the jacking direction of the first electric push rod is perpendicular to the moving direction of the U - shaped pulling block;

[0019] When the second electric push rod jacks up, the U - shaped pulling block jacks up horizontally, driving the activity connection block to rotate in the U - shaped base, thereby driving the flipping block to flip to the lower side of the U - shaped base. At this time, the jacking direction of the first electric push rod is parallel to the moving direction of the U - shaped pulling block.

[0020] A further improvement of the present invention lies in that: a horizontal sensor is arranged on the angle grinder. When the angle grinder is in the no - load working condition and the grinding working condition, the horizontal sensor ensures the levelness of the angle grinder before testing.

[0021] A further improvement of the present invention lies in that:

[0022] When the angle grinder is in the idling condition, the grinding disc of the angle grinder is not in contact with the workpiece to be processed;

[0023] When the angle grinder is in the grinding condition, the electric push rod 1 of the flip-type main handle test group and the flip-type sub-handle test group jacks up and pushes the angle grinder downward, so that the grinding disc of the angle grinder is in contact with the workpiece to be processed. At this time, the openings of the two finger-type clamping claws are both arranged downward, and the clamping directions of the two finger-type clamping claws are perpendicular;

[0024] When the angle grinder is in the cutting condition, the flip-type main handle test group drives the angle grinder to flip 90°. At this time, the grinding disc is in vertical contact with the workpiece to be processed, and the openings of the two finger-type clamping claws are arranged facing each other.

[0025] The present invention has the following advantages compared with the prior art:

[0026] 1. The present invention sets up a specific angle grinder vibration test device. By using the flip-type main handle test group and the flip-type sub-handle test group to clamp and fix the main handle and the sub-handle respectively, it ensures the moving levelness during the angle grinder test, replaces the traditional vibration test method of holding by the artificial arm, and avoids the influence on the test accuracy due to uncontrollable factors such as the arm grasping posture, grasping force, and grasping position during the working condition switching. Secondly, the setting of the vertical flipping group of the flip-type main handle test group and the flip-type sub-handle test group facilitates the rapid switching between the grinding condition and the cutting condition of the angle grinder. The position deviation of the test points during the switching is small, which is conducive to the later analysis and comparison of the vibration test data under each working condition. Further research provides an effective basis for the optimal design of the angle grinder handle by analyzing the maximum response of the operator's arm vibration.

[0027] 2. In the present application, the flip-type main handle test group and the flip-type sub-handle test group adopt finger-type clamping claws with different grasping directions and are combined with the corresponding vertical flipping group. It can not only realize the grasping and fixing of the mutually perpendicular main handle and sub-handle in the horizontal direction, but also realize the vertical flipping of the angle grinder, changing from the grinding condition to the cutting condition. At the same time, it can also realize the grasping and fixing of the mutually perpendicular main handle and sub-handle in the vertical direction. Description of the Drawings

[0028] Figure 1 It is a schematic structural diagram of the angle grinder vibration test device in the present invention.

[0029] Figure 2 It is Figure 1 an installation schematic diagram of the flip-type main handle test group, the flip-type sub-handle test group and the angle grinder in

[0030] Figure 3 It is Figure 2 a schematic structural diagram of the flip-type main handle test group and the flip-type sub-handle test group in

[0031] Figure 4 is Figure 2 Schematic diagram of the connection between the middle sliding disc and the fixed frame.

[0032] Figure 5 is Figure 2 Schematic diagram of the structure of the middle flip - type sub - handle test group.

[0033] Figure 6 is Figure 5 Schematic diagram of the connection of the middle flip - type sub - handle test group under the grinding working condition.

[0034] Figure 7 is Figure 5 Schematic diagram of the connection of the middle flip - type sub - handle test group under the cutting working condition.

[0035] Figure 8 This is the root - mean - square value of the 1 / 3 - octave vibration acceleration of the main and sub - handles of the present invention under the idling working condition.

[0036] Figure 9 This is the root - mean - square value of the 1 / 3 - octave vibration acceleration of the main and sub - handles of the present invention under the grinding working condition.

[0037] Figure 10 This is the root - mean - square value of the 1 / 3 - octave vibration acceleration of the main and sub - handles of the present invention under the cutting working condition.

[0038] Reference numerals in the figure:

[0039] 1 - main handle, 2 - sub - handle, 3 - grinding disc, 4 - flip - type main - handle test group, 5 - flip - type sub - handle test group, 6 - triaxial acceleration sensor, 7 - workpiece - to - be - processed platform, 8 - workpiece - to - be - processed, 9 - fixed frame, 10 - sliding disc, 11 - telescopic support leg, 12 - transmission lead screw, 13 - limiting rod, 14 - motor;

[0040] 41 - fixed base, 42 - vertical flip - over group, 43 - electric push rod 1, 44 - support connection seat, 45 - finger - type jaw, 421 - electric push rod 2, 422 - U - shaped base, 423 - U - shaped pull block, 424 - slotted opening, 425 - strip - shaped through - hole 1, 426 - movable connection block, 427 - connecting shaft rod 1, 428 - strip - shaped through - hole 2, 4210 - flip - over block. Specific embodiments

[0041] To deepen the understanding of the present invention, the present invention will be further described in detail below in combination with embodiments and drawings. The embodiments are only used to explain the present invention and do not constitute a limitation on the protection scope of the present invention.

[0042] In the description of the present invention, it should be understood that the terms indicating orientation or position relationship, such as those based on the orientation or position relationship shown in the drawings, are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the structures or units referred to must have a specific orientation. Therefore, it should not be construed as a limitation to the present invention.

[0043] In the present invention, unless otherwise clearly specified and defined, terms such as "connection", "provided with", "having", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection. It can be a mechanical connection, or a direct connection. It can be connected through an intermediate medium. For those skilled in the art, the basic meanings of the above terms in the present invention can be understood according to specific situations.

[0044] A vibration test method for a high-performance angle grinder, referring to Figures 1 to 5 A vibration test method for a high-performance angle grinder, characterized in that the specific steps include

[0045] S1. Locate the vibration test equipment for the angle grinder. The vibration test equipment for the angle grinder includes a flip-type main handle test group 4 and a flip-type sub-handle test group 5. Triaxial acceleration sensors 6 are provided on both the flip-type main handle test group 4 and the flip-type sub-handle test group 5.

[0046] S2. Locate the angle grinder. Horizontally position the angle grinder on the vibration test equipment for the angle grinder. The flip-type main handle test group 4 clamps and fixes the main handle 1 of the angle grinder, and the flip-type sub-handle test group 5 clamps and fixes the sub-handle 2 of the angle grinder.

[0047] S3. Start the angle grinder. Under the no-load working condition of the angle grinder, the triaxial acceleration sensors 6 collect the vibration signals at each measuring point position, and analyze and calculate the collected time-domain data through the dynamic test analysis platform software and display it.

[0048] S4. Stop the angle grinder. The whole vibration test equipment for the angle grinder moves downward so that the grinding wheel 3 of the angle grinder is close to the surface of the workpiece to be processed. Start the grinding machine, and the vibration test equipment for the angle grinder drives the angle grinder to move horizontally at a constant speed to realize the vibration test at each measuring point position under the grinding working condition of the grinding machine.

[0049] S5. The angle grinder stops, the flip-type auxiliary handle test group 5 releases the clamping of the auxiliary handle 2 of the angle grinder and withdraws from the auxiliary handle 2 of the angle grinder, and the flip-type main handle test group 4 flips 90° in the direction away from the auxiliary handle 2. At this time, the grinding disc 3 of the angle grinder is perpendicular to the workpiece 8 to be processed, and the auxiliary handle 2 of the angle grinder is vertically set on the front side of the main handle 1. The flip-type auxiliary handle test group 5 flips 90° in the direction of the auxiliary handle 2, and lifts and clamps it in the direction of the auxiliary handle 2. The grinder starts, and the angle grinder vibration test equipment drives the angle grinder to move at a uniform speed in the horizontal direction to realize the vibration test of each measuring point position of the grinder under the cutting condition.

[0050] The present invention sets up a specific angle grinder vibration test equipment, which respectively supports and fixes the main handle 1 and the auxiliary handle 2 through the flip-type main handle test group 4 and the flip-type auxiliary handle test group 5, thereby ensuring the horizontal movement of the angle grinder during the test, replacing the traditional vibration test method of holding by artificial arms, and avoiding the impact of uncontrollable factors such as arm gripping posture, gripping strength and gripping position when switching working conditions during the test process on the test accuracy; secondly, the setting of the vertical flip group 42 of the flip-type main handle test group 4 and the flip-type auxiliary handle test group 5 facilitates the rapid switching of the angle grinder grinding condition and the cutting condition. The position deviation of the test point is small during switching, which is conducive to the later analysis and comparison of vibration test data under various working conditions. Further research provides an effective basis for the optimal design of the angle grinder handle by analyzing the maximum response of the operator's arm vibration.

[0051] Based on this embodiment, the angle grinder vibration testing equipment also includes a fixed frame 9, telescopic legs 11 placed on both sides of the fixed frame 9, and a sliding plate 10 that moves horizontally back and forth in the fixed frame 9. The flip-type main handle test group 4 and the flip-type auxiliary handle test group 5 are fixed on the lower end surface of the sliding plate 10, and the lower side of the sliding plate 10 has a platform 7 to be processed.

[0052] In the present application, the setting of the telescopic legs 11 can enable the sliding plate 10 to drive the angle grinder as a whole to rise or fall. When the angle grinder is placed in an idling condition, the grinding disc 3 of the angle grinder does not contact the workpiece 8 to be processed. When the angle grinder is placed in a grinding condition, the grinding disc 3 of the angle grinder is in contact with the workpiece 8 to be processed. When the angle grinder is switched to a cutting condition, the angle grinder does not contact the workpiece 8 to be processed under the lifting action of the telescopic legs 11. The position of the angle grinder and the clamping direction are adjusted by the mutual cooperation and flipping of the flip-type auxiliary handle test group 5 and the flip-type main handle test group 4. Then, the angle grinder contacts the workpiece 8 to be processed under the contraction action of the telescopic legs 11 and performs a cutting vibration test.

[0053] On the basis of this embodiment, the fixing frame 9 is of a rectangular frame structure. The two side ends of the sliding disk 10 are embedded in the fixing frame 9. A transmission lead screw 12 and a limiting rod 13 are horizontally distributed in sequence through the fixing frame 9 and the sliding disk 10. The transmission lead screw 12 is in threaded cooperation with the sliding disk 10. The extending direction of the transmission lead screw 12 is consistent with the moving direction of the sliding disk 10. The limiting rod 13 is in clearance fit with the sliding disk 10. An electric motor 14 connected to the transmission lead screw 12 is provided outside the fixing frame 9.

[0054] In this application, the flip - type main handle test group 4 and the flip - type sub - handle test group 5 connected to the angle grinder are fixed to the sliding disk 10. During the vibration test, the electric motor 14 is started, the transmission lead screw 12 rotates. The transmission lead screw 12 is in threaded cooperation with the sliding disk 10, driving the sliding disk 10 to move horizontally back and forth as a whole, thereby driving the horizontal reciprocating cutting and grinding of the angle grinder, ensuring the horizontal degree of movement during the vibration test and reducing the vibration test error under different working conditions.

[0055] On the basis of this embodiment, referring to Figure 6 , Figure 7 , both the flip - type main handle test group 4 and the flip - type sub - handle test group 5 include a fixed base 41 arranged on the lower end face of the sliding disk 10 and a vertical flipping group 42. An electric push rod 43 is connected to the end of the vertical flipping group 42. The driving end of the electric push rod 43 is connected to a support connection seat 44. A finger - type jaw 45 is provided at one end of the support connection seat 44 away from the electric push rod 43. The three - axis acceleration sensor 6 is fixedly arranged on the corresponding finger - type jaw 45;

[0056] When the sub - handle 2 is perpendicular to the main handle 1 in the horizontal direction, the clamping directions of the two finger - type jaws 45 are perpendicular to each other; when the sub - handle 2 is perpendicular to the main handle 1 in the vertical direction, the two finger - type jaws 45 are arranged facing each other under the vertical flipping of the corresponding vertical flipping group 42.

[0057] On the basis of this embodiment, the vertical flipping group 42 includes an electric push rod two 421 fixedly arranged on the lower end surface of the fixed base 41 and a U-shaped base 422 fixedly arranged on the lower end surface of the sliding disk 10. The opening of the U-shaped base 422 is arranged downward. The driving end of the electric push rod two 421 horizontally extends towards the U-shaped base 422 with a U-shaped pulling block 423. The opening of the U-shaped pulling block 423 is arranged towards the U-shaped base 422, and both side ends of the U-shaped pulling block 423 cover the U-shaped base 422. Both sides of the U-shaped base 422 have slots 424 for the two ends of the U-shaped pulling block 423 to be horizontally embedded. The electric push rod two 421 jacks up to drive the U-shaped pulling block 423 to make horizontal reciprocating movement in the slots 424. There is a strip-shaped through hole one 425 in the slots 424. An active connection block 426 is hingedly connected in the U-shaped base 422. The active connection block 426 and the U-shaped base 422 are movably hinged through a connection shaft rod one 427. One end of the active connection block 426 has a strip-shaped through hole two 428. A connection shaft rod two 429 penetrates through the end of the U-shaped pulling block 423, the strip-shaped through hole one 425 and the strip-shaped through hole two 428. The other end of the active connection block 426 is fixedly connected with a flipping block 4210. The flipping block 4210 is placed outside the U-shaped base 422. The electric push rod one 43 is arranged between the flipping block 4210 and the support connection seat 44.

[0058] Specifically, the connection shaft rod one 427 is placed at the lower side position of the connection shaft rod two 429;

[0059] When the electric push rod two 421 contracts, the U-shaped pulling block 423 is placed at one end of the U-shaped base 422 close to the fixed base 41. At this time, the flipping block 4210 is placed beside the U-shaped base 422. The jacking direction of the electric push rod one 43 is perpendicular to the moving direction of the U-shaped pulling block 423;

[0060] When the electric push rod two 421 jacks up, the U-shaped pulling block 423 jacks up horizontally, driving the active connection block 426 to rotate in the U-shaped base 422, thereby driving the flipping block 4210 to flip to the lower side of the U-shaped base 422. At this time, the jacking direction of the electric push rod one 43 is parallel to the moving direction of the U-shaped pulling block 423.

[0061] In this application, the flipping main handle test group 4 and the flipping sub-handle test group 5 adopt finger-type jaws 45 with different grasping directions and are combined with the corresponding vertical flipping group 42, which can not only realize the grasping and fixing of the mutually perpendicular main handle 1 and sub-handle 2 in the horizontal direction, but also realize the vertical flipping of the angle grinder, changing from the grinding working condition to the cutting working condition, and at the same time can also realize the grasping and fixing of the mutually perpendicular main handle 1 and sub-handle 2 in the vertical direction.

[0062] On the basis of this embodiment, a horizontal sensor is arranged on the angle grinder. When the angle grinder is in the idling working condition and the grinding working condition, the levelness of the angle grinder before the test is ensured through the horizontal sensor.

[0063] In this embodiment, when the angle grinder is in an idling condition, the grinding disc 3 of the angle grinder is not in contact with the workpiece 8 to be processed;

[0064] When the angle grinder is in the grinding state, the electric push rods 43 of the flip-type main handle test group 4 and the flip-type auxiliary handle test group 5 are lifted and pushed downward to make the grinding disc 3 of the angle grinder contact with the workpiece 8 to be processed. At this time, the openings of the two finger-type clamps 45 are both set downward, and the clamping directions of the two finger-type clamps 45 are vertical;

[0065] When the angle grinder is in cutting mode, the flip main handle test group 4 drives the angle grinder to flip 90 degrees. At this time, the grinding disc 3 is in vertical contact with the workpiece 8, and the openings of the two finger-shaped clamping jaws 45 are arranged to face each other.

[0066] Figures 8 to 10 The 1 / 3 octave RMS acceleration of each axis of the main and auxiliary handles under idling, grinding, and cutting conditions was calculated and analyzed. By comparing the peak values of the RMS accelerations, it was found that the peak values of the main handle's X-axis were between 200 Hz and 280 Hz and 500 Hz and 600 Hz, and the peak value of the auxiliary handle's X-axis was between 150 Hz and 180 Hz; the peak value of the main handle's Y-axis was around 500 Hz, and the peak value of the auxiliary handle's Y-axis was around 400 Hz; the peak value of the main handle's Z-axis was around 315 Hz under idling conditions, and around 600 Hz under grinding and cutting conditions, and the peak value of the auxiliary handle's Z-axis was between 600 Hz and 680 Hz.

[0067] Under idling conditions, the vibration response of the main handle in the X-axis direction is significantly greater than that in the Y and Z-axes, and the vibration of the sub-handle in the Y and Z-axes is significantly greater than that in the X-axis, indicating that the vibration of the main handle in the X-axis direction and the sub-handle in the Y and Z-axes is not sufficiently restricted during motor installation and gear rotor assembly.

[0068] During grinding and cutting, the root mean square (RMS) vibration acceleration on the main handle's Y-axis and the sub-handle's Z-axis is high, intensifying vibration. During grinding, the main handle's Y-axis vibration is significantly higher than during cutting, while the sub-handle's Z-axis vibration is significantly higher. This can lead to significant grinding deformation and greater grinding force fluctuations during grinding. Therefore, consideration could be given to adding shock-absorbing material to the main handle's Y-axis and the sub-handle's Z-axis, or introducing an elastic element between the handle and the motor, to block and absorb most of the vibration in these directions.

[0069] Those skilled in the art should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. An efficient vibration testing method for angle grinders, characterized in that: The specific steps include: S1. Positioning an angle grinder vibration test device, wherein the angle grinder vibration test device includes a flip-type main handle test group and a flip-type auxiliary handle test group, each of which is provided with a triaxial acceleration sensor; S2. Position the angle grinder horizontally on the angle grinder vibration test equipment. The flip-type main handle test group clamps and fixes the main handle of the angle grinder. The flip-type secondary handle test group clamps and fixes the secondary handle of the angle grinder. S3. The angle grinder is started. When the angle grinder is idling, the three-axis acceleration sensor collects vibration signals at each measuring point. The collected time domain data is analyzed, calculated, and displayed using the dynamic test analysis platform software. S4. The angle grinder stops, and the angle grinder vibration test device moves downward as a whole so that the grinding disc of the angle grinder is in close contact with the surface of the workpiece to be processed. The grinder starts, and the angle grinder vibration test device drives the angle grinder to move horizontally at a uniform speed to achieve vibration testing of each measuring point of the grinder under the grinding condition; S5. The angle grinder stops, the flip-type auxiliary handle test group releases the clamping of the auxiliary handle of the angle grinder and withdraws from the auxiliary handle of the angle grinder. The flip-type main handle test group flips 90° away from the auxiliary handle. At this time, the grinding disc of the angle grinder is perpendicular to the workpiece to be processed, and the auxiliary handle of the angle grinder is vertically set in front of the main handle. The flip-type auxiliary handle test group flips 90° in the direction of the auxiliary handle, and lifts and clamps it in the direction of the auxiliary handle. The grinder starts, and the angle grinder vibration test equipment drives the angle grinder to move at a uniform speed in the horizontal direction to realize the vibration test of each measuring point position of the grinder under the cutting condition.

2. The high-efficiency angle grinder vibration test method according to claim 1, characterized in that: The angle grinder vibration testing equipment also includes a fixed frame, telescopic legs placed on both sides of the fixed frame, and a sliding plate that moves horizontally back and forth in the fixed frame. The flip-type main handle test group and the flip-type auxiliary handle test group are fixed on the lower end surface of the sliding plate, and the lower side of the sliding plate has a platform to be processed.

3. The high-efficiency angle grinder vibration test method according to claim 2, wherein: The fixed frame is a rectangular frame structure, and the two side ends of the sliding plate are embedded in the fixed frame. A transmission screw and a limit rod are horizontally distributed in sequence through the fixed frame and the sliding plate. The transmission screw is threaded with the sliding plate, and the extension direction of the transmission screw is consistent with the moving direction of the sliding plate. The limit rod is in clearance with the sliding plate, and a motor connected to the transmission screw is provided on the outside of the fixed frame.

4. The high-efficiency angle grinder vibration test method according to claim 3, wherein: The flip-type main handle test group and the flip-type auxiliary handle test group each include a fixed base arranged on the lower end surface of the sliding plate and a vertical flip group, the end of the vertical flip group is connected to an electric push rod 1, the driving end of the electric push rod 1 is connected to a support connecting seat, the end of the support connecting seat away from the electric push rod 1 has a finger-shaped clamp, and the three-axis acceleration sensor is fixedly arranged on the corresponding finger-shaped clamp; When the auxiliary handle is perpendicular to the main handle in the horizontal direction, the clamping directions of the two finger-type clamps are perpendicular to each other; when the auxiliary handle is perpendicular to the main handle in the vertical direction, the two finger-type clamps are arranged facing each other under the vertical flip of the corresponding vertical flip group.

5. The high-efficiency angle grinder vibration test method according to claim 4, characterized in that: The vertical flipping group includes an electric push rod II fixedly arranged on the lower end face of the fixed base and a U-shaped base fixedly arranged on the lower end face of the sliding disk. The opening of the U-shaped base is arranged downward. The driving end of the electric push rod II horizontally extends towards the U-shaped base with a U-shaped pulling block. The opening of the U-shaped pulling block is arranged towards the U-shaped base, and both side ends of the U-shaped pulling block cover the U-shaped base. Both sides of the U-shaped base are provided with slots for the two ends of the U-shaped pulling block to be horizontally embedded. The electric push rod II jacks up to drive the U-shaped pulling block to make horizontal reciprocating movement in the slots. A strip-shaped through hole I is arranged in the slots. An activity connection block is hingedly connected in the U-shaped base. The activity connection block and the U-shaped base are movably hinged through a connection shaft rod I. One end of the activity connection block is provided with a strip-shaped through hole II. A connection shaft rod II penetrates through the end of the U-shaped pulling block, the strip-shaped through hole I and the strip-shaped through hole II. The other end of the activity connection block is fixedly connected with a flipping block. The flipping block is arranged outside the U-shaped base. The electric push rod I is arranged between the flipping block and the support connection seat.

6. The high-efficiency angle grinder vibration test method according to claim 5, characterized in that: The connection shaft rod I is arranged at the lower side position of the connection shaft rod II; When the electric push rod II contracts, the U-shaped pulling block is arranged at one end of the U-shaped base close to the fixed base. At this time, the flipping block is arranged beside the U-shaped base. The jacking direction of the electric push rod I is perpendicular to the moving direction of the U-shaped pulling block; When the electric push rod II jacks up, the U-shaped pulling block jacks up horizontally forward, driving the activity connection block to rotate in the U-shaped base, thereby driving the flipping block to flip to the lower side of the U-shaped base. At this time, the jacking direction of the electric push rod I is parallel to the moving direction of the U-shaped pulling block.

7. The high-efficiency angle grinder vibration test method according to claim 6, characterized in that: A horizontal sensor is arranged on the angle grinder. When the angle grinder is in the no-load working condition and the grinding working condition, the horizontality of the angle grinder before the test is ensured through the horizontal sensor.

8. The method for testing the vibration of a high-efficiency angle grinder according to claim 7, wherein: When the angle grinder is in the no-load working condition, the grinding disc of the angle grinder does not contact the workpiece to be processed; When the angle grinder is in the grinding working condition, the electric push rods I of the flipping main handle test group and the flipping sub-handle test group both jack down to push the angle grinder, so that the grinding disc of the angle grinder contacts the workpiece to be processed. At this time, the openings of both finger-type clamping jaws are arranged downward, and the clamping directions of both finger-type clamping jaws are perpendicular; When the angle grinder is in the cutting working condition, the flipping main handle test group drives the angle grinder to flip 90°. At this time, the grinding disc is in vertical contact with the workpiece to be processed, and the openings of both finger-type clamping jaws are arranged facing each other.

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