Automatic hardness detection device for automobile control arm production

Abstract

The invention relates to the technical field of hardness detection, in particular to an automatic hardness detection device for automobile control arm production, which comprises a detection table, an automatic durometer is mounted on the detection table, two manipulators are fixedly mounted on the detection table on two sides of the durometer respectively, a turntable is mounted on the automatic durometer, and a polishing pad is fixedly mounted on the lower surface of the turntable. A through hole is formed in the rotary disc, a telescopic groove is formed in the rotary disc, a plunger is installed in the telescopic groove, an air outlet channel is formed in the inner wall of the telescopic groove below the plunger, a vertical groove is coaxially formed in the bottom end of the plunger, an air inlet hole communicated with the vertical groove is formed in the surface of the side, close to the motor, of the plunger, and an air guide channel is formed in the inner wall of the telescopic groove and corresponds to the air inlet hole. And the plunger is in transmission connection with a driving module. Through the arrangement of the turntable and the like, the polishing pad on the turntable can be used for automatically polishing the surface of the detection point of the control arm, and blowing can be performed after polishing is completed, so that the detection efficiency can be improved, and the detection precision can also be improved.

Description

Technical Field

[0001] The invention relates to the technical field of hardness detection, and in particular to an automated hardness detection device for automobile control arm production. Background Art

[0002] The suspension system has a great influence on the ride smoothness and handling stability of the car. As the guiding and force transmission element of the automobile suspension system, the control arm transmits various forces acting on the wheel to the body, while ensuring that the wheel moves along a certain trajectory. The control arm elastically connects the wheel and the body through a ball joint or bushing. It should have sufficient hardness and service life.

[0003] The automobile control arm may have different hardness distributions in different areas. Especially during the heat treatment, casting, forging and other processes, the hardness of the parts is often unevenly distributed. Therefore, when testing the hardness, it is necessary to reasonably select the test points to ensure the comprehensiveness of the test.

[0004] However, the shape of the automobile control arm is complex, and the points to be selected are distributed in different directions and positions, which brings difficulties to the hardness test. The existing technology designs the fixture. After each point is tested, the clamping direction needs to be manually changed and then tested. It needs to change the test multiple times, the degree of automation is low, and the test time is long. For this reason, the existing technology begins to use one or more manipulators to cooperate with the automatic hardness tester to use the manipulator to grab the control arm, and then move the control arm to the bottom of the automatic hardness tester, and automatically adjust the posture of the control arm to align any test point with the test pressure head of the automatic hardness tester. After alignment, the automatic hardness tester is started for testing; such a testing device still has certain limitations when used. Before measuring the hardness of some control arms, the test points need to be polished to remove surface stains and oxides, etc., to ensure the test precision and accuracy. Especially for high-precision tests and control arms with uneven surfaces, polishing is particularly important. The existing automatic hardness testing device mainly relies on manual processing for polishing the control arm detection points, which is inefficient. Summary of the invention

[0005] The purpose of the present invention is to solve the shortcomings of the prior art, such as low detection efficiency and the need for manual grinding of detection points, and to propose an automated hardness detection device for automobile control arm production.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions: An automatic hardness testing device for automobile control arm production is designed, comprising a testing platform, characterized in that an automatic hardness tester is installed on the testing platform, a manipulator is fixedly installed on the testing platforms on both sides of the automatic hardness tester, a hydraulic rod is fixedly installed on the automatic hardness tester, a motor is installed at the end of the hydraulic rod, a turntable is coaxially installed at the end of the output shaft of the motor, a grinding pad is fixedly installed on the lower surface of the turntable, and a through hole corresponding to the detection pressure head is opened on the turntable in the height direction, so that the detection pressure head of the automatic hardness tester can pass through the through hole; A telescopic groove is provided on the upper surface of the turntable between the through hole and the motor in the height direction, a plunger is coaxially telescopically installed in the telescopic groove, an air outlet communicated with the through hole is provided on the inner wall of the telescopic groove below the plunger, a vertical groove is coaxially provided on the bottom end of the plunger, the vertical groove is communicated with the telescopic groove, an air inlet hole communicated with the vertical groove is provided on the surface of the plunger close to the motor side, an air guide channel is provided corresponding to the air inlet hole on the inner wall of the telescopic groove, the air guide channel is communicated with a compressed gas supply module, the plunger is transmission-connected with a driving module, the driving module is used to drive the plunger to perform reciprocating telescopic motion in the telescopic groove, so that the plunger can intermittently align the air inlet hole thereon with the air guide channel.

[0007] Preferably, the air outlet is arranged as a whole to be inclined toward the telescopic slot side.

[0008] Preferably, the compressed gas supply module includes an inflation cylinder, a piston, a first one-way valve, a connecting channel, and a second one-way valve. The inflation cylinder is fixed on the upper surface of the turntable, and is radially arranged parallel to the turntable. The inflation cylinder is opened on one side of the central axis of the turntable, and the other end of the inflation cylinder is sealed. A piston is coaxially telescopically installed in the inflation cylinder, a vent hole is coaxially penetrated on the piston, a first one-way valve is installed in the vent hole, a connecting channel is penetrated on the inner wall of the bottom of the inflation cylinder away from the piston, the connecting channel is connected to the air guide channel, and a second one-way valve is installed in the connecting channel.

[0009] Preferably, an air storage channel is coaxially opened at the end of the air guide channel away from the telescopic slot, the tail end of the air storage channel penetrates the outer wall of the turntable, and an elastic film is covered and fixed on the outlet of the tail end of the air storage channel.

[0010] Preferably, the driving module includes a first magnetic block, a second magnetic block, and a guide groove. A guide groove is provided on the inner wall of the through hole close to the telescopic groove. A second magnetic block is installed in the guide groove along the radial telescopic direction of the turntable. The first magnetic block is also embedded in the inner wall of the through hole. The first magnetic block and the second magnetic block are arranged opposite to each other, the first magnetic block and the second magnetic block attract each other, and the second magnetic block is connected to the plunger transmission.

[0011] Preferably, a guide rod is fixed to one end of the second magnetic block near the plunger, and the guide rod is arranged parallel to the radial direction of the turntable. The guide rod penetrates the inner wall of the guide groove and extends into the telescopic groove. A top block is fixed on the side of the plunger in the telescopic groove, and a slope is provided on the top of the top block, and the slope is inclined toward the plunger side, and the guide rod contacts the slope on the top of the top block.

[0012] Preferably, the end of the guide rod away from the second magnetic block is semi-spherical.

[0013] The invention provides an automated hardness testing device for automobile control arm production, which has the following beneficial effects: By arranging an automatic hardness tester and two manipulators on the testing table, the two manipulators can be used to automatically grasp and adjust the points of the control arm. In combination with the automatic hardness tester, automated hardness testing can be achieved. By providing a turntable, after the two manipulators align the detection point of the control arm with the detection pressure head, the rotating turntable drives the grinding pad to grind the surface of the control arm, thus realizing automatic grinding with higher efficiency. By arranging a plunger, an air outlet duct, etc. on the turntable, the centrifugal force generated when the turntable rotates is used to synchronously generate compressed gas and store it in the air duct. When the detection pressure head moves down and passes through the through hole, the magnetic force between the first magnetic block and the second magnetic block is hindered, so that the plunger can align the air inlet hole on it with the air duct, and the compressed gas stored in the air duct can be sprayed onto the surface of the detection point below the detection pressure head through the air outlet duct, so that the dust and impurities remaining on the detection point are blown away, thereby further improving the detection accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the structure of an automated hardness testing device for automobile control arm production proposed by the present invention; Figure 2 This is a schematic diagram of the hydraulic rod, motor and turntable structure of an automated hardness testing device for automobile control arm production proposed by the present invention; Figure 3 Schematic diagram of the hydraulic rod, motor and turntable structure of an automated hardness testing device for automobile control arm production proposed by the present invention Figure 2 ; Figure 4 This is a schematic diagram of the turntable structure of an automated hardness testing device for automobile control arm production proposed by the present invention; Figure 5 A schematic diagram of the internal structure of a turntable of an automated hardness testing device for automobile control arm production proposed by the present invention; Figure 6 This is a schematic diagram of the plunger structure of an automated hardness testing device for automobile control arm production proposed by the present invention; Figure 7 Schematic diagram of the working state of the plunger of the automatic hardness testing device for automobile control arm production proposed by the present invention Figure 1 ; Figure 8 Schematic diagram of the working state of the plunger of the automatic hardness testing device for automobile control arm production proposed by the present invention Figure 2 .

[0015] In the figure: 1. testing table; 2. automatic hardness tester; 3. testing pressure head; 4. manipulator; 5. hydraulic rod; 6. motor; 7. turntable; 8. through hole; 9. grinding pad; 10. inflator; 11. piston; 12. first one-way valve; 13. air guide channel; 14. second one-way valve; 15. connecting channel; 16. telescopic groove; 17. plunger; 18. vertical groove; 19. air inlet; 20. air outlet; 21. top block; 22. guide groove; 23. guide rod; 24. second magnetic block; 25. first magnetic block; 26. air storage channel; 27. elastic membrane. DETAILED DESCRIPTION

[0016] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0017] Example 1: Reference Figure 1-6 , an automated hardness testing device for automobile control arm production, comprising a testing platform 1, an automatic hardness tester 2 is installed on the testing platform 1, a manipulator 4 is fixedly installed on the testing platform 1 on both sides of the automatic hardness tester 2, a hydraulic rod 5 is fixedly installed on the automatic hardness tester 2, the hydraulic rod 5 is arranged parallel to the central axis of the detection pressure head 3 of the automatic hardness tester 2, a motor 6 is installed at the end of the output shaft of the hydraulic rod 5, the motor 6 is arranged parallel to the hydraulic rod 5, a turntable 7 is coaxially installed at the end of the output shaft of the motor 6, a grinding pad 9 is fixedly installed on the lower surface of the turntable 7, and a through hole 8 corresponding to the detection pressure head 3 is opened on the turntable 7 along the height direction, so that the detection pressure head 3 of the hardness tester can pass through the through hole 8; A telescopic groove 16 is provided on the upper surface of the turntable 7 between the through hole 8 and the motor 6 along the height direction, and a plunger 17 is coaxially telescopically installed in the telescopic groove 16. An air outlet 20 connected to the through hole 8 is provided on the inner wall of the telescopic groove 16 below the plunger 17, and a vertical groove 18 is coaxially provided at the bottom end of the plunger 17. The vertical groove 18 is connected to the telescopic groove 16. An air inlet 19 connected to the vertical groove 18 is provided on the surface of the plunger 17 on one side close to the motor 6, and an air guide 13 is correspondingly provided on the inner wall of the telescopic groove 16. The air inlet 19 is provided on the inner wall of the telescopic groove 16, and the air guide 13 is connected to the compressed gas supply module. The plunger 17 is transmission-connected to a driving module, and the driving module is used to drive the plunger 17 to perform reciprocating telescopic motion in the telescopic groove 16, so that the plunger 17 can intermittently align the air inlet 19 thereon with the air guide 13.

[0018] The outlet duct 20 is arranged as a whole to be inclined toward the side of the telescopic slot 16. The inclined outlet duct 20 can blow the blown gas obliquely toward the surface of the workpiece below the through hole 8, thereby blowing the residual dust on the surface of the workpiece farther away, and obtaining a better blowing effect.

[0019] The compressed gas supply module includes an inflatable cylinder 10, a piston 11, a first one-way valve 12, a connecting channel 15, and a second one-way valve 14. The inflatable cylinder 10 is fixed on the upper surface of the turntable 7. The inflatable cylinder 10 is radially arranged parallel to the turntable 7. The inflatable cylinder 10 is opened on one side of the central axis of the turntable 7, and the other end of the inflatable cylinder 10 is sealed. A piston 11 is coaxially telescopically installed in the inflatable cylinder 10, and a vent hole is coaxially penetrated on the piston 11. A first one-way valve 12 is installed in the vent hole. The first one-way valve 12 is used to prevent the gas in the inflatable cylinder 10 from flowing out through the vent hole. A connecting channel 15 is penetrated on the inner wall of the bottom of the inflatable cylinder 10 away from the piston 11. The connecting channel 15 is connected to the air guide channel 13. A second one-way valve 14 is installed in the connecting channel 15. The second one-way valve 14 is used to prevent the gas in the air guide channel 13 from flowing into the inflatable cylinder 10.

[0020] When the turntable 7 rotates, as the speed of the turntable 7 gradually increases, under the action of centrifugal force, the piston 11 will move toward the side away from the central axis of the turntable 7. At this time, the first one-way valve 12 in the air hole on the piston 11 is in a closed state, and the second one-way valve 14 in the connecting channel 15 is in an open state, so that the piston 11 squeezes the gas in the inflatable cylinder 10 into the air guide 13 through the connecting channel 15, so that the air guide 13 is filled with compressed gas; when the turntable 7 stops rotating, the piston 11 will also automatically reset under the action of the reset spring in the inflatable cylinder 10. At this time, the first one-way valve 12 in the air hole on the piston 11 is in an open state, and the second one-way valve 14 in the connecting channel 15 is in a closed state, so that the gas filled into the air guide 13 will not overflow. The compressed gas supply module uses the centrifugal force generated when the turntable 7 rotates to achieve the generation of compressed gas, and realizes the storage of compressed gas through the mutual cooperation of the first one-way valve 12 and the second one-way valve 14.

[0021] An air storage channel 26 is coaxially provided at the end of the air guide channel 13 away from the telescopic groove 16. The tail end of the air storage channel 26 penetrates the outer wall of the turntable 7. An elastic membrane 27 is covered and fixed on the outlet of the tail end of the air storage channel 26. In order to avoid the limited centrifugal force generated due to the insufficient rotation speed of the turntable 7, so that the piston 11 cannot squeeze enough gas into the air guide channel 13, the air storage channel 26 and the elastic membrane 27 are provided. When the gas is squeezed into the air guide channel 13, the elastic membrane 27 will expand, so that the pressure of the gas in the air guide channel 13 that needs to be squeezed does not need to be too large, so that compressed gas can still be generated at a low rotation speed.

[0022] Example 2: Reference Figure 7-8 As another preferred embodiment of the present invention, the difference from Embodiment 1 is that the driving module includes a first magnetic block 25, a second magnetic block 24, and a guide groove 22. A guide groove 22 is opened on the inner wall of the through hole 8 near the telescopic groove 16. A second magnetic block 24 is installed in the guide groove 22 along the radial telescopic direction of the turntable 7. The inner end of the second magnetic block 24 is fixedly connected to the bottom end of the guide groove 22 through a reset spring. The first magnetic block 25 is also embedded in the inner wall of the through hole 8. The first magnetic block 25 and the second magnetic block 24 are arranged opposite to each other. The first magnetic block 25 and the second magnetic block 24 attract each other, and the second magnetic block 24 is transmission-connected to the plunger 17. When the driving module is in use, when the detection pressure head 3 extends into the through hole 8, the magnetic force between the first magnetic block 25 and the second magnetic block 24 decreases due to the blocking effect of the detection pressure head 3. At this time, the second magnetic block 24 shrinks under the action of the return spring in the guide groove 22, thereby driving the plunger 17 to move downward, so that the air inlet 19 on the plunger 17 is aligned with the air guide 13. In this way, automatic air jet blowing can be achieved during hardness testing, which greatly reduces the dust remaining on the surface of the testing point.

[0023] A guide rod 23 is fixed to one end of the second magnetic block 24 near the plunger 17. The guide rod 23 is radially arranged parallel to the turntable 7. The guide rod 23 penetrates the inner wall of the guide groove 22 and then extends into the telescopic groove 16. A top block 21 is fixed to the side of the plunger 17 in the telescopic groove 16. A slope is provided on the top of the top block 21, and the slope is tilted toward the side of the plunger 17. The guide rod 23 contacts the slope at the top of the top block 21. When the second magnetic block 24 retracts, the second magnetic block 24 will push the guide rod 23 inward, and the guide rod 23 will push the top block 21 downward, and the top block 21 drives the plunger 17 to move downward. The end of the guide rod 23 away from the second magnetic block 24 is semi-spherical. The spherical end can reduce the degree of wear between the top block 21 and the top block 21.

[0024] The overall workflow of the present invention is as follows: The control arm to be tested is placed on one side of the testing platform 1, and then the two manipulators 4 are controlled to grab the control arm. Then the two manipulators 4 cooperate with each other to put the control arm under the testing head 3 of the automatic hardness tester 2, and automatically adjust the posture of the control arm so that the testing point of the control arm can be aligned with the testing head 3; Then, the hydraulic rod 5 is controlled to push the motor 6 and the turntable 7 downward until the grinding pad 9 on the lower surface of the turntable 7 contacts the surface of the control arm. At this time, the hydraulic rod 5 is stopped, and the motor 6 is started to drive the turntable 7 to rotate. During the rotation of the turntable 7, the grinding pad 9 will be driven to grind the surface near the detection point of the control arm; after the grinding is completed, the motor 6 is controlled to decelerate the motor 6, and the through hole 8 on the turntable 7 is aligned with the detection pressure head 3, and then the hydraulic rod 5 is controlled to drive the motor 6 and the turntable 7 to move up a distance so that the grinding pad 9 does not contact the surface of the control arm; in the above process, when the turntable 7 rotates, the turntable 7 will drive the inflatable cylinder 10 thereon to rotate synchronously, so that the piston 11 in the inflatable cylinder 10 will move toward the outside under the action of centrifugal force, thereby squeezing the gas in the inflatable cylinder 10 into the air guide channel 13 through the connecting channel 15, so that the gas in the air guide channel 13 is in a higher pressure state; Finally, the detection head 3 on the automatic hardness tester 2 is controlled to automatically descend. During the descending process of the detection head 3, when the detection head 3 passes through the through hole 8, the magnetic force between the first magnetic block 25 and the second magnetic block 24 decreases due to the blocking effect of the detection head 3. Figure 7-8As shown, at this time, the magnetic force on the second magnetic block 24 is weakened, and under the action of the reset spring in the guide groove 22, the second magnetic block 24 will be pulled inward by the reset spring, thereby pushing the top block 21 through the guide rod 23 to drive the plunger 17 to move downward, so that the air inlet 19 on the plunger 17 is aligned with the air guide channel 13, so that the gas under a higher pressure state in the air guide channel 13 will enter the vertical groove 18 through the air inlet 19, and then enter the telescopic groove 16 through the vertical groove 18, and finally spray to the surface of the control arm detection point below the detection pressure head 3 through the air outlet 20 on the inner wall of the telescopic groove 16, so as to blow away the dust and impurities remaining on the surface of the control arm; when the detection pressure head 3 passes through the through hole 8 and contacts the detection point on the control arm, the automatic hardness tester 2 is controlled to perform hardness detection.

[0025] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An automated hardness testing device for automobile control arm production, comprising a testing platform (1), characterized in that: An automatic hardness tester (2) is installed on the testing platform (1), a manipulator (4) is fixedly installed on the testing platform (1) on both sides of the automatic hardness tester (2), a hydraulic rod (5) is fixedly installed on the automatic hardness tester (2), a motor (6) is installed at the end of the hydraulic rod (5), a turntable (7) is coaxially installed at the end of the output shaft of the motor (6), a grinding pad (9) is fixedly installed on the lower surface of the turntable (7), and a through hole (8) is formed on the turntable (7) corresponding to the detection pressure head (3), so that the detection pressure head (3) of the automatic hardness tester (2) can pass through the through hole (8); A telescopic groove (16) is provided on the upper surface of the turntable (7) between the through hole (8) and the motor (6) in the height direction, a plunger (17) is coaxially telescopically installed in the telescopic groove (16), an air outlet (20) communicating with the through hole (8) is provided on the inner wall of the telescopic groove (16) below the plunger (17), a vertical groove (18) is coaxially provided at the bottom end of the plunger (17), the vertical groove (18) is communicated with the telescopic groove (16), and a side of the plunger (17) close to the motor (6) is provided with a vertical groove (18). An air inlet hole (19) in communication with the vertical groove (18) is provided on the surface; an air guide channel (13) is provided on the inner wall of the telescopic groove (16) in correspondence with the air inlet hole (19); the air guide channel (13) is in communication with a compressed gas supply module; the plunger (17) is transmission-connected to a drive module; the drive module is used to drive the plunger (17) to perform reciprocating telescopic motion in the telescopic groove (16) so that the plunger (17) can intermittently align the air inlet hole (19) thereon with the air guide channel (13).

2. The automated hardness testing device for automobile control arm production according to claim 1 is characterized in that: The air outlet passage (20) is arranged as a whole to be inclined toward the telescopic groove (16).

3. The automated hardness testing device for automobile control arm production according to claim 1 is characterized in that: The compressed gas supply module comprises an inflatable cylinder (10), a piston (11), a first one-way valve (12), a connecting passage (15), and a second one-way valve (14). The inflatable cylinder (10) is fixed on the upper surface of the turntable (7). The inflatable cylinder (10) is arranged parallel to the radial direction of the turntable (7). The inflatable cylinder (10) is arranged with an opening on one side facing the central axis of the turntable (7). The other end of the inflatable cylinder (10) is sealed. A piston (11) is coaxially telescopically mounted in the inflatable cylinder (10). A vent hole is coaxially penetrated on the piston (11). The first one-way valve (12) is installed in the vent hole. A connecting passage (15) is penetrated on the inner wall of the bottom of the inflatable cylinder (10) on the side away from the piston (11). The connecting passage (15) is communicated with the air guide passage (13). The second one-way valve (14) is installed in the connecting passage (15).

4. The automated hardness testing device for automobile control arm production according to claim 1 or 3, characterized in that: An air storage channel (26) is coaxially opened at the end of the air guide channel (13) on a side away from the telescopic slot (16), the tail end of the air storage channel (26) penetrates the outer wall of the rotating disk (7), and an elastic membrane (27) is covered and fixed on the tail end outlet of the air storage channel (26).

5. The automated hardness testing device for automobile control arm production according to claim 1 is characterized in that: The driving module comprises a first magnetic block (25), a second magnetic block (24), and a guide groove (22); a guide groove (22) is provided on the inner wall of the through hole (8) near the telescopic groove (16); a second magnetic block (24) is installed in the guide groove (22) along the radial direction of the turntable (7); the first magnetic block (25) is also embedded in the inner wall of the through hole (8); the first magnetic block (25) and the second magnetic block (24) are arranged opposite to each other; the first magnetic block (25) and the second magnetic block (24) attract each other; and the second magnetic block (24) is drivingly connected to the plunger (17).

6. The automated hardness testing device for automobile control arm production according to claim 5, characterized in that: A guide rod (23) is fixed to one end of the second magnetic block (24) close to the plunger (17). The guide rod (23) is arranged parallel to the radial direction of the turntable (7). The guide rod (23) penetrates the inner wall of the guide groove (22) and extends into the telescopic groove (16). A top block (21) is fixed to the side of the plunger (17) in the telescopic groove (16). An inclined surface is provided on the top of the top block (21), and the inclined surface is inclined toward the side of the plunger (17). The guide rod (23) contacts the inclined surface on the top of the top block (21).

7. The automated hardness testing device for automobile control arm production according to claim 6 is characterized in that: The end of the guide rod (23) away from the second magnetic block (24) is in a semi-spherical shape.

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