A precision grinding device for assembly holes of automotive injection molded parts

Abstract

This disclosure provides a precision grinding device for assembly holes in automotive injection molded parts, comprising: a grinding rod with a round rod fixedly mounted at its bottom end, a connecting plate rotatably mounted on its top end via a bearing, and a driving mechanism above it for driving the grinding rod to rotate; two storage slots symmetrically opened on the outer peripheral wall of the round rod, each containing a grinding block slidably mounted, with both ends of one side of the grinding block being beveled, and two buffer mechanisms between them for injecting air into the storage slots respectively; and a monitoring mechanism located below the driving mechanism. This invention relates to the technical field of grinding devices for assembly holes in injection molded parts. When in use, this improved grinding device can sequentially remove burrs from the inner ring edge or chamfered surface at the top of the assembly hole, the inner wall of the assembly hole, and the inner ring edge or chamfered surface at the bottom of the assembly hole through the rotation of the grinding rod, achieving a good burr removal effect on the assembly hole.

Description

Technical Field

[0001] This disclosure belongs to the technical field of grinding devices for assembly holes of injection molded parts, and specifically relates to a precision grinding device for assembly holes of automotive injection molded parts. Background Technology

[0002] Injection molding is a molding process widely used in manufacturing, mainly for producing plastic products. Its core principle is to inject molten plastic material into a mold cavity, and after cooling and solidification, a product of the desired shape is obtained. In the automobile manufacturing process, some structural parts are generally made by injection molding. After the injection-molded automobile parts are shaped, there are often a certain amount of burrs on their assembly holes. At this time, the burrs on the assembly holes are usually removed by a grinding device to ensure the quality of the injection-molded automobile parts.

[0003] In some existing automotive injection molding part grinding devices, the grinding rod is used to grind and deburr the inner wall of the assembly hole. However, there may be burrs on the circumferential edges or chamfered surfaces of the openings at both ends of the assembly hole. It is difficult for the rotating grinding rod to grind the burrs on the circumferential edges and chamfered surfaces, which affects the grinding effect of the assembly hole. Summary of the Invention

[0004] Therefore, the technical problem to be solved by the present invention is to provide a precision grinding device for assembly holes of automotive injection molded parts, which can remove burrs from the inner ring edge or chamfered surface at the top of the assembly hole, the inner wall of the assembly hole, and the inner ring edge or chamfered surface at the bottom of the assembly hole in sequence by rotating the grinding rod, and the burr removal effect on the assembly hole is good.

[0005] To solve the above problems, the present invention provides a precision grinding device for assembly holes of automotive injection molded parts, comprising: a grinding rod, a round rod fixedly mounted at its bottom end, a connecting disc rotatably mounted at its top end via a bearing, and a driving mechanism above it for driving the grinding rod to rotate.

[0006] Two storage tanks are symmetrically opened on the outer peripheral wall of the round rod. A grinding block is slidably installed in each tank. Both ends of one side of the grinding block are beveled. Two buffer mechanisms are provided between them for injecting air into the storage tanks respectively.

[0007] Monitoring mechanism one, located below the drive mechanism, is used to monitor the length of the grinding block extending from the storage tank;

[0008] Monitoring mechanism two, located inside connecting plate one, is used to monitor the rotation angle of the grinding rod.

[0009] Furthermore, the diameter of the round rod is smaller than the diameter of the grinding rod, and the outer ring edge at the bottom end of the round rod is arc-shaped.

[0010] Furthermore, a piston plate is fixedly mounted on the other side of the grinding block, and the outer peripheral wall of the piston plate is in contact with the inner wall of the corresponding storage tank.

[0011] Furthermore, a ball bearing is rotatably mounted at the center of one side of the grinding block, and one end of the ball bearing near the outer peripheral wall of the grinding rod is coplanar with the outer peripheral wall of the grinding rod.

[0012] Furthermore, the monitoring mechanism includes an inner cavity, which is opened in the middle of the connecting plate, and the interior of the inner cavity is connected to the interior of the two storage slots through a connecting hole. The outer periphery of the top of the grinding rod is provided with a number of air pressure detection sensors in a circular array, and the monitoring end of each air pressure detection sensor is inserted into the inner cavity and threadedly connected to the connecting plate.

[0013] Furthermore, the top of the grinding rod has an I-shaped front view, and a sealing ring is installed in the inner wall of the connecting disc at the position corresponding to the grinding rod, and the inner ring wall of the sealing ring is in contact with the outer peripheral wall of the grinding rod.

[0014] Furthermore, the second monitoring mechanism includes an infrared array sensor, which is fixedly installed on the inner top wall of the inner cavity. A gradient reflector is fixedly installed at the top of the grinding rod corresponding to the position of the infrared array sensor, and both the infrared array sensor and the gradient reflector are arranged in a ring.

[0015] Furthermore, the driving mechanism includes a driver, which is located above the first connecting plate, and the driving end of the driver is connected to the grinding rod through a connector. The second connecting plate is fixedly installed on the housing at the bottom of the driver, and the second connecting plate is fixedly connected to the first connecting plate by bolts.

[0016] Furthermore, the connector includes a fixed cylinder, the top of which is inserted into the second connecting plate and rotatably connected to the second connecting plate via a bearing. The driving end of the driver is inserted into the second connecting plate and fixedly connected to the center position of the top of the fixed cylinder. A hexagonal rod is slidably installed inside the fixed cylinder, and the bottom end of the hexagonal rod and the bottom end of the fixed cylinder are in contact with the top side of the first connecting plate. A connecting shaft is fixedly installed at the bottom end of the hexagonal rod, and the bottom end of the connecting shaft is inserted into the inner cavity and fixedly connected to the center position of the top of the grinding rod.

[0017] Furthermore, the top of the connecting hole is Y-shaped, and the two openings at the top of the connecting hole are located on the outer periphery of the connecting shaft. The connecting shaft passes through the inner hole of the infrared array sensor and the inner hole of the gradient reflector and is in clearance fit with the infrared array sensor and the gradient reflector. A sealing ring is installed in the inner wall of the connecting disk at the position corresponding to the connecting shaft, and the inner ring wall of the sealing ring is in contact with the inner wall of the connecting shaft.

[0018] Furthermore, a receiving groove is provided on the top side of the connecting plate, and the interior of the receiving groove is connected to the interior of the inner cavity. The receiving groove is located on the outer periphery of the infrared array sensor, and a one-way valve is fixedly installed inside the receiving groove.

[0019] Furthermore, the buffer mechanism includes a receiving cavity, which is opened on the outer peripheral wall of the round rod, and an elastic airbag is provided inside it. The end of the elastic airbag near the storage tank is fixedly connected to the inner wall of the corresponding receiving cavity, and the interior of the elastic airbag is connected to the interior of the corresponding storage tank through a connecting hole.

[0020] In summary, the present invention has at least one of the following beneficial technical effects:

[0021] 1. When using this improved assembly hole grinding device, the burrs on the inner ring edge or chamfered surface at the top of the assembly hole, the inner wall of the assembly hole, and the inner ring edge or chamfered surface at the bottom of the assembly hole can be removed sequentially by rotating the grinding rod. The burr removal effect on the assembly hole is good.

[0022] 2. During the process of removing burrs from the inner wall of the assembly hole, the rotation of the grinding rod can be used to simultaneously detect whether there are pits on the assembly hole and the location of the pits. This allows for the determination of the number of pits on the assembly hole. If there are too many pits on the assembly hole, the operator is reminded to conduct further inspection of the assembly hole to avoid excessive pits affecting the use of automotive injection molded parts. Attached Figure Description

[0023] Figure 1 This is a perspective view of the overall structure of the present invention;

[0024] Figure 2 This is a front view of the internal structure of the grinding rod and the round rod of the present invention;

[0025] Figure 3 For the present invention Figure 2 Enlarged view of the structure at point A in the middle;

[0026] Figure 4 This is a perspective view of the internal structure of the round rod of the present invention;

[0027] Figure 5 This is a perspective view of the internal structure of part of the round rod, connecting disc one, and connecting disc two of the present invention;

[0028] Figure 6 For the present invention Figure 2 Enlarged view of the structure at point B;

[0029] Figure 7 This is a perspective view of the internal structure of the connecting disk of the present invention after it has been inverted;

[0030] Figure 8 This is a perspective view of the internal structure of the connecting disc and part of the grinding rod of the present invention.

[0031] The reference numerals in the attached figures are as follows:

[0032] 1. Grinding rod; 2. Round rod; 3. Connecting disc one; 4. Monitoring mechanism one; 41. Inner cavity; 42. Connecting hole; 43. Air pressure sensor; 44. Sealing ring; 5. Monitoring mechanism two; 51. Infrared array sensor; 52. Gradient reflector; 6. Drive mechanism; 61. Driver; 62. Connector; 621. Fixed cylinder; 622. Hexagonal rod; 623. Connecting shaft; 624. Sealing ring; 63. Connecting disc two; 7. Storage tank; 8. Grinding block; 9. Piston plate; 10. Ball bearing; 11. Receiving groove; 12. One-way valve; 13. Buffer mechanism; 131. Receiving cavity; 132. Elastic airbag. Detailed Implementation

[0033] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0034] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0035] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0036] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0037] See also Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 6 As shown, according to Embodiment 1 of the present invention, a precision grinding device for assembly holes of automotive injection molded parts is provided, comprising: a grinding rod 1, a round rod 2 fixedly mounted at its bottom end, a connecting disc 3 rotatably sleeved at its top end via a bearing, and a driving mechanism 6 above it for driving the grinding rod 1 to rotate.

[0038] Two storage tanks 7 are symmetrically opened on the outer peripheral wall of the round rod 2. A grinding block 8 is slidably installed in each tank. The upper and lower ends of one side of the grinding block 8 are both set in a bevel shape. Two buffer mechanisms 13 are provided between them for injecting air into the storage tanks 7 respectively.

[0039] Monitoring mechanism 4, located below the drive mechanism 6, is used to monitor the length of the grinding block 8 extending from the storage tank 7.

[0040] Monitoring mechanism 25, located inside connecting plate 13, is used to monitor the rotation angle of grinding rod 1.

[0041] In this embodiment, when using the improved assembly hole grinding device, (please refer to...) Figure 1 As shown, the housing of the driver 61 in the drive mechanism 6 is fixedly mounted to the bottom end of the electrically controlled telescopic rod of the adjustment structure of the precision grinding device for the assembly holes of automotive injection molded parts by bolts. This allows the adjustment structure of the precision grinding device for the assembly holes of automotive injection molded parts to adjust the position of the grinding rod 1 above the automotive injection molded part by adjusting the position of the driver 61, so that the grinding rod 1 can be aligned with several assembly holes of the automotive injection molded part in sequence. The aforementioned precision grinding device for the assembly holes of automotive injection molded parts is an existing device, and its platform is also equipped with a clamp for clamping and positioning the automotive injection molded part. After the automotive injection molded part is clamped and fixed on the platform of the precision grinding device for the assembly holes of automotive injection molded parts, the position of the grinding rod 1 is adjusted by the adjustment structure, so that the grinding rod 1 moves in sequence to the top of several assembly holes of the automotive injection molded part.

[0042] Please refer to Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, after the grinding rod 1 moves to the top of the assembly hole, the electrically controlled telescopic rod pushes the grinding rod 1 downward and drives the round rod 2 to move downward and insert into the assembly hole until the bottom side of the grinding block 8 is coplanar with the top of the assembly hole. Then the drive mechanism 6 drives the grinding rod 1 to rotate, and the grinding block 8 of the corresponding length is thrown out of the storage tank 7 by centrifugal force. (The centrifugal force on the grinding block 8 can be adjusted by adjusting the rotation of the grinding rod 1.) At this time, the bottom side of the grinding block 8 rubs against the top plane of the assembly hole to remove some of the burrs on the inner ring edge of the top of the assembly hole.

[0043] After the burrs above the inner ring edge at the top of the assembly hole are removed, the drive mechanism 6 stops driving the grinding rod 1. Then the electric telescopic rod continues to push the grinding rod 1 downward until the middle of the bottom side slope of the grinding block 8 is aligned with the inner ring edge at the top of the assembly hole. At this time, the drive mechanism 6 continues to drive the round rod 2 to rotate, throwing the grinding block 8 out, so that the bottom side slope of the grinding block 8 contacts the inner ring edge or the top chamfer surface of the assembly hole. Thus, through the friction between the bottom side slope of the grinding block 8 and the inner ring edge or chamfer surface at the top of the assembly hole, another part of the burrs on the inner ring edge at the top of the assembly hole is removed, or the burrs on the chamfer surface are removed.

[0044] After the burrs on the inner ring edge or chamfered surface at the top of the assembly hole are removed, the drive mechanism 6 stops driving the grinding rod 1. Then the electric telescopic rod continues to slowly push the grinding rod 1 downward. When the bottom end of the grinding rod 1 is inserted into the assembly hole, the drive mechanism 6 continues to drive the grinding rod 1 to rotate slowly. The burrs on the inner wall of the assembly hole are removed by the rotating grinding rod 1.

[0045] During the process of removing burrs from the inner wall of the assembly hole by the round rod 2, the downward movement and rotation of the round rod 2 cause one side of the grinding block 8 to sweep across the inner wall of the assembly hole. At the same time, the monitoring mechanism 1 4 is activated. By monitoring the length of the grinding block 8 extending from the storage tank 7, it is determined whether there are pits on the inner wall of the assembly hole. The height of the pit on the assembly hole is determined by the downward movement of the round rod 2. In conjunction with the monitoring mechanism 2 5 monitoring the rotation angle of the grinding rod 1, the accurate position of the pit on the inner wall of the assembly hole can be further determined. The number of pits on the assembly hole is also determined simultaneously. When there are too many pits on the assembly hole, the operator is reminded to perform further inspection of the assembly hole to avoid the excessive number of pits on the assembly hole affecting the use of automotive injection molded parts.

[0046] It should be noted that the operation of the above equipment is controlled by the control host of the precision grinding device for the assembly hole of automotive injection molded parts, and the detection information of monitoring mechanism 4 and monitoring mechanism 5 is transmitted to the control host through the existing Internet of Things. The position of the pit on the inner wall of the assembly hole is determined by the internal program of the control host and displayed on the display panel of the control host.

[0047] After the burrs on the inner wall of the assembly hole are removed, the round rod 2 moves synchronously to the bottom side of the assembly hole. Then, according to the above, the drive mechanism 6 drives the rotation to throw the grinding block 8 out of the storage tank 7. Thus, the burrs on the inner ring edge or chamfer surface of the bottom end of the assembly hole are removed by the mutual friction between the top side of the grinding block 8 and the bottom plane of the assembly hole and the mutual friction between the inclined surface of the top side of the grinding block 8 and the inner ring edge or chamfer surface of the bottom end of the assembly hole.

[0048] After the burrs on the assembly hole are removed, the drive mechanism 6 stops driving the grinding rod 1, and the grinding rod 1 and the round rod 2 can be pulled out of the assembly hole directly.

[0049] In summary, when this improved assembly hole grinding device is used, it can remove burrs from the inner ring edge or chamfered surface at the top of the assembly hole, the inner wall of the assembly hole, and the inner ring edge or chamfered surface at the bottom of the assembly hole in sequence by rotating the grinding rod 1. The burr removal effect on the assembly hole is good.

[0050] In a further preferred embodiment of the invention, such as Figure 2 and Figure 3 As shown, the diameter of the round rod 2 is smaller than the diameter of the grinding rod 1, and the outer ring edge at the bottom of the round rod 2 is set in an arc shape.

[0051] In this embodiment, the diameter of the round rod 2 is slightly smaller than that of the grinding rod 1. When the round rod 2 is inserted into the assembly hole and moves downward, it can bend the burrs by contacting each other with the burrs on the inner wall of the assembly hole, so that the burrs move into the gap between the round rod 2 and the inner wall of the assembly hole, thereby avoiding the contact between the round rod 2 and the burrs from affecting the downward movement of the grinding rod 1.

[0052] In a further preferred embodiment of the invention, such as Figure 2 , Figure 3 and Figure 4 As shown, a piston plate 9 is fixedly installed on the other side of the grinding block 8, and the outer peripheral wall of the piston plate 9 is in contact with the inner wall of the corresponding storage tank 7.

[0053] In this embodiment, please refer to Figure 3 and Figure 4 As shown, when a portion of the grinding block 8 is thrown out of the storage tank 7 by centrifugal force, the piston plate 9 can be driven to slide synchronously in the storage tank 7, thereby forming a negative pressure chamber of a corresponding size in the storage tank 7. The negative pressure chamber applies a pulling force towards the storage tank 7 to the grinding block 8 through the piston plate 9 to counteract the centrifugal force on the grinding block 8.

[0054] When the grinding rod 1 stops rotating, the negative pressure chamber in the storage groove 7 pulls the grinding block 8 into the storage groove 7 automatically, so as to avoid a part of the grinding block 8 always being outside the storage groove 7, which would affect the insertion of the round rod 2 into the assembly hole or the removal of the round rod 2 from the assembly hole.

[0055] In a further preferred embodiment of the invention, such as Figure 2 , Figure 3 and Figure 4 As shown, a ball bearing 10 is rotatably mounted at the center of one side of the grinding block 8, and the end of the ball bearing 10 near the outer peripheral wall of the grinding rod 1 is coplanar with the outer peripheral wall of the grinding rod 1.

[0056] In this embodiment, please refer to Figure 3 and Figure 4As shown, after the burrs on the inner ring edge or chamfered surface at the top of the assembly hole are removed, the drive mechanism 6 stops driving the grinding rod 1. Then, the electrically controlled telescopic rod continues to slowly push the grinding rod 1 downward until the ball 10 contacts the inner ring edge at the top of the assembly hole. At this time, due to the mutual contact between the ball 10 and the inner ring edge at the top of the assembly hole, the grinding block 8 will not slide out of the storage groove 7. This avoids the grinding block 8 extending out of the storage groove 7 and rubbing against the inner wall of the assembly hole when the grinding rod 1 removes burrs on the inner wall of the assembly hole, which would cause damage to the inner wall of the assembly hole.

[0057] In a further preferred embodiment of the invention, such as Figure 2 , Figure 3 , Figure 6 and Figure 8 As shown, the monitoring mechanism 4 includes an inner cavity 41, which is located in the middle of the connecting plate 3. The interior of the inner cavity 41 is connected to the interior of the two storage slots 7 through the connecting hole 42. Several air pressure detection sensors 43 are arranged in a circular array on the outer periphery of the top of the grinding rod 1. The monitoring end of each air pressure detection sensor 43 is inserted into the inner cavity 41 and threadedly connected to the connecting plate 3.

[0058] In this embodiment, please refer to Figure 2 , Figure 3 , Figure 6 and Figure 8 As shown, when the grinding rod 1 removes burrs from the inner wall of the assembly hole, the air pressure detection sensor 43 simultaneously monitors the negative pressure intensity in the inner cavity 41. (The inner cavity 41 and the connecting hole 42 are filled with a small amount of gas, so that a negative pressure cavity of corresponding intensity is formed in the inner cavity 41 and the connecting hole 42, so as to continuously apply a corresponding pulling force towards the connecting hole 42 to the grinding rod 1 through the piston rod.)

[0059] After the ball bearing 10 contacts the inner ring edge at the top of the mounting hole, the drive mechanism 6 continues to drive the grinding rod 1 to rotate slowly. At the same time, the electrically controlled telescopic rod pushes the grinding rod 1 to move slowly downward so that the grinding rod 1 can be inserted into the mounting hole. Through the friction between the outer peripheral wall of the grinding rod 1 and the burrs on the inner wall of the mounting hole, the burrs on the inner wall of the mounting hole are removed. At the same time, the rotation and downward movement of the round rod 2 cause the ball bearing 10 to roll over various positions on the inner wall of the mounting hole in sequence. When the ball bearing 10 moves to the recessed position, due to the centrifugal force pulling on the grinding block 8, part of the grinding block is removed. The grinding block 8 extends out of the storage groove 7 until the ball 10 comes into contact with the inner wall of the pit. At this time, the negative pressure intensity in the storage groove 7 increases. Then the ball 10 rolls out of the pit along the inner wall of the pit, and the negative pressure intensity in the storage groove 7 is restored. The air pressure detection sensor 43 transmits the detection information of the negative pressure intensity in the inner cavity 41 to the control host through the Internet of Things. The air pressure detection sensor 43 is installed on the connecting plate 3 and does not need to rotate with the grinding rod 1, which facilitates the connection of the external circuit of the air pressure detection sensor 43.

[0060] The use of multiple air pressure sensors 43 can prevent damage to the air pressure sensors from affecting the use of the device. When an air pressure sensor 43 is damaged, it can be simply unscrewed from the connecting plate 3 and replaced with a new air pressure sensor 43, which can then be screwed back into the connecting plate 3. The replacement of the air pressure sensor 43 is simple.

[0061] In a further preferred embodiment of the invention, such as Figure 2 and Figure 6 As shown, the top of the grinding rod 1 is shaped like an I-beam. A sealing ring 44 is installed in the inner wall of the connecting disc 3 at the position corresponding to the grinding rod 1, and the inner ring wall of the sealing ring 44 is in contact with the outer peripheral wall of the grinding rod 1.

[0062] In this embodiment, the sealing ring 44 can seal the gap between the top of the grinding rod 1 and the connecting plate 3, so as to prevent external gas from flowing into the inner cavity 41 through the gap between the grinding rod 1 and the connecting plate when the grinding rod 1 is rotating or not rotating, thus affecting the pulling force on the grinding plate towards the storage tank 7.

[0063] In a further preferred embodiment of the invention, such as Figure 2 , Figure 6 and Figure 7 As shown, the monitoring mechanism 2 5 includes an infrared array sensor 51, which is fixedly installed on the inner top wall of the inner cavity 41. A gradient reflector 52 is fixedly installed at the top of the grinding rod 1 at the position corresponding to the infrared array sensor 51. Both the infrared array sensor 51 and the gradient reflector 52 are arranged in a ring.

[0064] In this embodiment, please refer to Figure 2 , Figure 6 and Figure 7 As shown, during the rotation of the grinding rod 1, the infrared array sensor 51 is activated, emitting infrared rays to the gradient reflector 52 and detecting the intensity distribution of reflected light. Simultaneously, the rotating grinding rod 1 drives the gradient reflector 52 to rotate synchronously (the reflectivity of the gradient reflector 52 gradually changes along the axial direction of the rod, such as from total reflection to total absorption). The control host calculates the rotation of the grinding rod 1 based on the reflectivity gradient at different positions of the gradient reflector 52 read by the infrared array sensor 51 and the linear relationship of the reflection intensity distribution. Combined with the height of the round rod 2, i.e., the grinding rod 1, located in the assembly hole, the position of the ball bearing 10 on the inner wall of the assembly hole can be determined. Thus, when pressure changes occur in the inner cavity 41, the position of the pit on the inner wall of the assembly hole can be determined. The device has a high degree of automation, and the infrared array sensor 51 is mounted on the connecting plate 3 and will not rotate with the grinding rod 1, which facilitates the connection of the infrared array sensor 51 to the external circuit.

[0065] In a further preferred embodiment of the invention, such as Figure 1, Figure 2 , Figure 5 and Figure 6 As shown, the drive mechanism 6 includes a driver 61, which is located above the connecting plate 3. The drive end of the driver 61 is connected to the grinding rod 1 through the connector 62. The connecting plate 63 is fixedly installed on the housing at the bottom of the driver 61, and the connecting plate 63 is fixedly connected to the connecting plate 3 by bolts.

[0066] In this embodiment, please refer to Figure 2 , Figure 5 and Figure 6 As shown, when the drive mechanism 6 drives the grinding rod 1 to rotate, the driver 61 starts and drives the grinding rod 1 to rotate through the connector 62 (the driver 61 is mainly composed of a housing, a motor and a gear transmission structure). During this process, due to the bolt fixing between the connecting plate 2 63 and the connecting plate 1 3 and the connection fixing between the connecting plate 2 63 and the housing of the driver 61, the connecting plate 1 3 will not rotate with the grinding rod 1 during the rotation of the grinding rod 1. This prevents the air pressure detection sensor 43 and the infrared array sensor 51 on the connecting plate 1 3 from rotating with the grinding rod 1. The air pressure detection sensor 43 and the infrared array sensor 51 are installed in the same way as the existing air pressure detection sensor 43 and infrared array sensor 51, which are installed in a fixed position. The existing original wiring connection method can be used to complete the connection of the air pressure detection sensor 43 and the infrared array sensor 51 to the external wiring.

[0067] In a further preferred embodiment of the invention, such as Figure 2 , Figure 5 , Figure 6 and Figure 8 As shown, the connector 62 includes a fixed cylinder 621, the top of which is inserted into the connecting plate 2 63 and rotatably connected to the connecting plate 2 63 via a bearing. The driving end of the driver 61 is inserted into the connecting plate 2 63 and fixedly connected to the center position of the top of the fixed cylinder 621. A hexagonal rod 622 is slidably installed inside the fixed cylinder 621. The bottom end of the hexagonal rod 622 and the bottom end of the fixed cylinder 621 are both in contact with the top side of the connecting plate 1 3. A connecting shaft 623 is fixedly installed at the bottom end of the hexagonal rod 622. The bottom end of the connecting shaft 623 is inserted into the inner cavity 41 and fixedly connected to the center position of the top of the grinding rod 1.

[0068] In this embodiment, please refer to Figure 2 , Figure 5 , Figure 6 and Figure 8As shown, when the driver 61 starts, it first drives the fixed cylinder 621 to rotate inside the connecting plate 63 (the inner hole of the fixed cylinder 621 is hexagonal). Due to the mutual contact between the hexagonal rod 622 and the inner wall of the fixed cylinder 621, the rotating fixed cylinder 621 synchronously drives the hexagonal rod 622 to rotate, and then drives the grinding rod 1 to rotate together through the connecting shaft 623.

[0069] When replacing the grinding rod 1 and the grinding block 8, the operator unscrews the bolts inside the connecting plate 3. Then, by pulling down the grinding rod 1, the hexagonal rod 622 can be directly pulled out from the fixing cylinder 621, separating the connecting plate 3 from the connecting plate 2 63, thus completing the disassembly of the grinding rod 1. Then, a new grinding rod 1 is replaced, and the connecting plate 3 on the new grinding rod 1 is aligned with the connecting plate 2 63, so that the hexagonal rod 622 is simultaneously inserted into the fixing cylinder 621. Finally, the connection between the connecting plate 3 and the connecting plate 2 63 is completed with bolts, thus completing the replacement of the grinding rod 1 and the grinding block 8. The operation is relatively simple.

[0070] In a further preferred embodiment of the invention, such as Figure 6 and Figure 8 As shown, the top of the connecting hole 42 is Y-shaped, and the two openings at the top of the connecting hole 42 are located on the outer periphery of the connecting shaft 623. The connecting shaft 623 passes through the inner hole of the infrared array sensor 51 and the inner hole of the gradient reflector 52 and is in clearance fit with the infrared array sensor 51 and the gradient reflector 52. A sealing ring 624 is installed in the inner wall of the connecting disk 3 at the position corresponding to the connecting shaft 623, and the inner ring wall of the sealing ring 624 is in contact with the inner wall of the connecting shaft 623.

[0071] In this embodiment, please refer to Figure 6 and Figure 8 As shown, the Y-shaped arrangement at the top of the connecting hole 42 allows sufficient space between the two openings at the top of the connecting hole 42 for the connection and fixation of the connecting shaft 623 and the grinding rod 1, thus preventing the connection between the connecting shaft 623 and the grinding rod 1 from affecting the communication between the inside of the connecting hole 42 and the inside of the inner cavity 41.

[0072] The sealing ring 624 can seal the gap between the connecting shaft 623 and the connecting disc 3, so as to prevent outside air from flowing into the inner cavity 41 through the gap between the connecting shaft 623 and the connecting disc 3, which would affect the tension on the piston plate 9.

[0073] In a further preferred embodiment of the invention, such as Figure 8 As shown, a receiving groove 11 is provided on the top side of the connecting plate 3, and the interior of the receiving groove 11 is connected to the interior of the inner cavity 41. The receiving groove 11 is located on the outer periphery of the infrared array sensor 51, and a one-way valve 12 is fixedly installed inside the receiving groove 11.

[0074] In this embodiment, please refer to Figure 8 As shown, when replacing the air pressure sensor 43, since the inner cavity 41 is connected to the outside, outside air flows into the inner cavity 41 through the mounting hole of the air pressure sensor 43, so that the air pressure in the inner cavity 41 is equal to that in the outside. At this time, the one-way valve 12 is connected to the external air extraction device through the pipeline. The air extraction device extracts part of the gas in the inner cavity 41 through the one-way valve 12, so that the negative pressure intensity in the inner cavity 41 is restored to the original state, avoiding damage to the device caused by replacing the air pressure sensor 43, and facilitating the maintenance of the device.

[0075] In a further preferred embodiment of the invention, such as Figure 4 As shown, the buffer mechanism 13 includes a receiving cavity 131, which is opened on the outer peripheral wall of the round rod 2. An elastic airbag 132 is provided inside the cavity, and the end of the elastic airbag 132 near the storage tank 7 is fixedly connected to the inner wall of the corresponding receiving cavity 131. The interior of the elastic airbag 132 is connected to the interior of the corresponding storage tank 7 through a connecting hole.

[0076] In this embodiment, please refer to Figure 4 As shown, when the grinding block 8 slides out of the storage tank 7, some gas is injected into the storage tank 7 by the deformation of the elastic air bladder 132, so as to avoid the piston plate 9 being subjected to excessive negative pressure suction during the process of the grinding block 8 sliding out of the storage tank 7, which would prevent the grinding block 8 from sliding out.

[0077] Working principle: When this improved assembly hole polishing device is used, the rotating polishing rod 1 and polishing block 8 sequentially remove burrs from the inner ring edge or chamfered surface at the top of the assembly hole, the inner wall of the assembly hole, and the inner ring edge or chamfered surface at the bottom of the assembly hole. While rotating the polishing rod 1 to remove burrs on the inner wall of the assembly hole, the ball bearing 10 is simultaneously driven to roll through all positions on the inner wall of the assembly hole. The number and position of pits on the nickel coin in the assembly hole are detected by the length of the polishing block 8 extending from the storage groove 7.

[0078] It will be readily understood by those skilled in the art that the aforementioned advantageous methods can be freely combined and superimposed without conflict.

[0079] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention. The above are merely preferred embodiments of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the protection scope of the present invention.

Claims

1. A precision grinding device for assembly holes of automotive injection molded parts, characterized in that, include: A grinding rod (1) has a round rod (2) fixedly mounted at its bottom end, and a connecting plate (3) rotatably mounted on its top end via a bearing. A driving mechanism (6) is provided above it to drive the grinding rod (1) to rotate. Two storage slots (7) are symmetrically opened on the outer peripheral wall of the round rod (2), and grinding blocks (8) are slidably mounted in each slot. The upper and lower ends of one side of the grinding block (8) are both inclined. Two buffer mechanisms (13) are provided between them to inject air into the storage slots (7) respectively. A monitoring mechanism (4) is located below the driving mechanism (6) to monitor the length of the grinding block (8) extending out of the storage slot (7). A monitoring mechanism (5) is located in the connecting plate (3) to monitor the rotation angle of the grinding rod (1). The diameter of the round rod (2) is smaller than the diameter of the grinding rod (1). 2) The outer ring edge at the bottom is arc-shaped. A piston plate (9) is fixedly installed on the other side of the grinding block (8), and the outer peripheral wall of the piston plate (9) is in contact with the inner wall of the corresponding storage tank (7). A ball bearing (10) is rotatably installed at the center of one side of the grinding block (8), and the end of the ball bearing (10) near the outer peripheral wall of the grinding rod (1) is coplanar with the outer peripheral wall of the grinding rod (1). The monitoring mechanism (4) includes an inner cavity (41), which is opened in the middle of the connecting plate (3), and the interior of the inner cavity (41) is connected to the interior of the two storage tanks (7) through the connecting hole (42). Several air pressure detection sensors (43) are arranged in a circular array on the outer peripheral side of the top of the grinding rod (1), and the monitoring end of each air pressure detection sensor (43) is inserted into the inner cavity (41) and threadedly connected to the connecting plate (3).

2. The precision grinding device for assembly holes of automotive injection molded parts according to claim 1, characterized in that, The top of the grinding rod (1) is shaped like an I-beam. A sealing ring (44) is installed in the inner wall of the connecting disc (3) at the position corresponding to the grinding rod (1), and the inner ring wall of the sealing ring (44) is in contact with the outer peripheral wall of the grinding rod (1).

3. The precision grinding device for assembly holes of automotive injection molded parts according to claim 2, characterized in that, The second monitoring mechanism (5) includes an infrared array sensor (51), which is fixedly installed on the inner top wall of the inner cavity (41). A gradient reflector (52) is fixedly installed at the top of the grinding rod (1) at the position corresponding to the infrared array sensor (51), and both the infrared array sensor (51) and the gradient reflector (52) are arranged in a ring.

4. A precision grinding device for assembly holes of automotive injection molded parts according to claim 3, characterized in that, The drive mechanism (6) includes a driver (61) which is located above the first connecting plate (3), and the drive end of the driver (61) is connected to the grinding rod (1) through a connector (62). The second connecting plate (63) is fixedly installed on the outer shell at the bottom of the driver (61), and the second connecting plate (63) is fixedly connected to the first connecting plate (3) by bolts.

5. A precision grinding device for assembly holes of automotive injection molded parts according to claim 4, characterized in that, The connector (62) includes a fixed cylinder (621), the top of which is inserted into the second connecting plate (63) and rotatably connected to the second connecting plate (63) through a bearing. The driving end of the driver (61) is inserted into the second connecting plate (63) and fixedly connected to the center position of the top of the fixed cylinder (621). A hexagonal rod (622) is slidably installed inside the fixed cylinder (621). The bottom end of the hexagonal rod (622) and the bottom end of the fixed cylinder (621) are both in contact with the top side of the first connecting plate (3). A connecting shaft (623) is fixedly installed at the bottom end of the hexagonal rod (622). The bottom end of the connecting shaft (623) is inserted into the inner cavity (41) and fixedly connected to the center position of the top of the grinding rod (1).

6. A precision grinding device for assembly holes of automotive injection molded parts according to claim 5, characterized in that, The top of the connecting hole (42) is Y-shaped, and the two openings at the top of the connecting hole (42) are located on the outer periphery of the connecting shaft (623). The connecting shaft (623) passes through the inner hole of the infrared array sensor (51) and the inner hole of the gradient reflector (52) and is in clearance fit with the infrared array sensor (51) and the gradient reflector (52). A sealing ring (624) is installed in the inner wall of the connecting disk (3) at the position corresponding to the connecting shaft (623), and the inner ring wall of the sealing ring (624) is in contact with the outer wall of the connecting shaft (623).

7. A precision grinding device for assembly holes of automotive injection molded parts according to claim 6, characterized in that, The top side of the connecting plate (3) is provided with a receiving groove (11), and the inside of the receiving groove (11) is connected to the inside of the inner cavity (41). The receiving groove (11) is located on the outer periphery of the infrared array sensor (51), and a one-way valve (12) is fixedly installed in the receiving groove (11).

8. A precision grinding device for assembly holes of automotive injection molded parts according to claim 7, characterized in that, The buffer mechanism (13) includes a receiving cavity (131) which is opened on the outer peripheral wall of the round rod (2) and has an elastic airbag (132) inside. The end of the elastic airbag (132) near the storage tank (7) is fixedly connected to the inner wall of the corresponding receiving cavity (131). The interior of the elastic airbag (132) is connected to the interior of the corresponding storage tank (7) through a connecting hole.

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