CN116117238A - A device for removing burrs in the inner cavity of hard parts - Google Patents

Abstract

The invention provides a device for removing burrs in the inner cavity of hard parts, which is used for removing burrs in the inner cavity of hard parts under the control of a numerical control machine tool. The high hydraulic pressure is used as a programmable control power source. By setting the drive unit inside the connection unit and connecting the connection unit with the CNC machine tool, the drive unit can be pushed to move under high hydraulic pressure, and the drive unit drives the action unit to move, so that the action unit Contact the inner cavity of the hard part to complete the deburring operation. It is easy to use, improves the deburring efficiency, ensures the quality stability of the hard part product, and saves labor at the same time.

Description

A device for removing burrs in the inner cavity of hard parts

technical field

The invention relates to the technical field of precision machining, in particular to a device for removing burrs from inner cavities of hard parts.

Background technique

At present, with the continuous emergence of new technologies and materials, product processing tends to be more and more high-precision and good surface finish. Excellent products are an important guarantee for enterprises to improve product added value and competitiveness.

Many aviation and semiconductor machines require material hardening treatment (heat treatment) before finishing. In this case, after finishing, cutting burrs and flanging will inevitably occur inside the cavity of the part. The burrs and flanging inside the part cavity cannot be automatically removed on the machine. Manual removal of these burrs and flanging is easy to damage the product, affecting product accuracy and quality stability, and the removal speed is slow, affecting the processing efficiency of the part.

Contents of the invention

The purpose of the present invention is to solve the shortcomings of the hard part inner cavity burrs and flanging that cannot be automatically removed on the machine, manual removal affects product accuracy and quality stability, and the removal speed is slow. The utility model relates to a device for removing burrs in inner chambers of hard parts.

In order to achieve the above purpose, the present invention adopts the following technical scheme: a device for removing burrs in the inner cavity of hard parts, which is used to remove burrs in the inner cavity of hard parts under the control of a numerically controlled machine tool (CNC). The device includes a connecting unit, a drive Unit and action unit, the connection unit is connected with the tool handle of the CNC machine tool, the drive unit is set inside the connection unit, the action unit is set at the end of the connection unit away from the tool handle of the CNC machine tool, and the drive unit is sprayed on the spindle of the CNC machine tool flowing into the connection unit Driven by cutting fluid to move, the action unit touches the inner cavity of hard parts driven by the drive unit to remove burrs.

Preferably, the connecting unit includes a connecting rod, a liquid flow hole is provided in the middle of the connecting rod, the liquid flow hole passes through the connecting rod, and a first groove and a second groove are provided on the side wall of the connecting rod far away from the handle of the CNC machine tool , the first groove and the second groove are oppositely arranged, the first groove and the second groove are both connected to the liquid flow hole, and the groove depth of the first groove along the axis of the connecting rod is smaller than that of the second groove along the axis of the connecting rod The drive unit is arranged in the liquid flow hole, and the end of the action unit close to the drive unit is arranged in the corresponding position of the second groove in the connecting rod.

Further, the driving unit includes a driving part, a first connecting part, a first elastic part, a second connecting part and a second elastic part, the first connecting part is fixed on the inner wall of the liquid flow hole, and one end of the first elastic part is connected to the second elastic part. A connecting piece is connected, the other end of the first elastic piece is connected with the driving piece, the driving piece is arranged in the liquid flow hole so as to move axially along the liquid flow hole, and the side wall of the driving piece close to the second groove is provided with a receiving The second connecting piece is fixed on the groove wall of the accommodating groove, one end of the second elastic piece is connected with the second connecting piece, and the other end of the second elastic piece is connected with the action unit.

Still further, the action unit includes an action piece and a guide piece. The end of the action piece close to the driving piece is arranged at a position corresponding to the second groove in the connecting rod, and the end of the action piece close to the drive piece is provided with a contact point facing the first groove. The inclined surface, the end of the contact inclined surface close to the first groove is located in the first groove, there is a first distance between the end of the contact inclined surface close to the first groove and the bottom surface of the first groove, and the contact inclined surface is close to the end of the second groove One end is provided with a connection protrusion, the connection protrusion is connected with the second elastic member, the connection protrusion is in contact with the driving member, the side wall of the action member close to the first groove is located in the first groove, and the middle position of the action member is provided with In the guide groove, one end of the guide member is fixed on one side of the inner wall of the liquid flow hole, and the other end of the guide member passes through the guide groove and is fixed on the other side of the inner wall of the liquid flow hole.

Further, the action unit also includes a fixed rotating part, a first clamping part and a second clamping part, the first clamping part and the second clamping part are respectively located on both sides of the action part, the first groove, the second The groove walls of the groove are all bonded to the first clamping part, the groove walls of the first groove and the second groove are all bonded to the second clamping part, and the first clamping part is close to the side wall of the first groove Located in the first groove, the side wall of the second clamping part close to the first groove is located in the first groove, the middle part of the action part is provided with a rotation hole, and the position corresponding to the rotation hole is provided on the first clamping part The first connection hole, the position corresponding to the rotation hole on the second clamping member is provided with the second connection hole, the position corresponding to the rotation hole on the side wall of the connecting rod is provided with the first fixing hole and the second fixing hole, and the fixed rotation The piece passes through the first fixing hole, the first connecting hole, the rotation hole, the second connecting hole, and the second fixing hole in order to connect the first clamping piece, the action piece, the second clamping piece and the connecting rod.

Furthermore, the end face of the first clamping part far away from the driving part and the end face of the second clamping part far away from the driving part are coplanar with the end face of the connecting rod close to the action part; the guide groove is in an arc-shaped structure, and the center of the guide groove The shaft is arranged coaxially with the central axis of the rotary hole.

Furthermore, the thickness of the side wall of the action piece close to the first groove is smaller than the thickness of the side wall of the action piece close to the second groove; the liquid flow holes are sequentially arranged from the end far away from the first groove to the end close to the first groove. Including the first part, the second part and the third part, the first part, the second part and the third part are connected in sequence, the inner diameter of the first part is smaller than the inner diameter of the second part, the inner diameter of the second part is smaller than the inner diameter of the third part, the first Both the groove and the second groove communicate with the third part, the height of the third part along the axial direction of the connecting rod is greater than the groove depth of the second groove along the axial direction of the connecting rod, and the first connecting piece is fixed on the inner wall of the second part , the driving member is movably arranged in the third part.

Still further, a pressure relief port is provided at the end of the driving member close to the first elastic member, and the pressure relief port communicates with the accommodating groove.

Compared with the prior art, the beneficial effect of the present invention is: using the CNC machine tool spindle to spray cutting fluid with high hydraulic pressure as a programmable control power source, by setting the drive unit inside the connection unit, the connection unit is connected with the CNC machine tool, Under high hydraulic pressure, the drive unit can be pushed to move, and the drive unit drives the action unit to move, so that the action unit contacts the inner cavity of the hard part and completes the burr removal operation. It is easy to use, improves the burr removal efficiency, and ensures the hard part product. Quality stability, while saving labor.

Description of drawings

FIG. 1 is a schematic structural view of a device for removing burrs from a hard part inner cavity according to an embodiment of the present invention.

FIG. 2 is a schematic top view of the structure of FIG. 1 .

FIG. 3 is a schematic cross-sectional structure diagram along the A-A direction of FIG. 2 .

FIG. 4 is a schematic structural diagram of a driving member according to an embodiment of the present invention.

Fig. 5 is a schematic structural diagram of an action member according to an embodiment of the present invention.

Fig. 6 is a schematic diagram of the application structure of a device for removing burrs in the inner cavity of a hard part according to an embodiment of the present invention.

FIG. 7 is a schematic cross-sectional structure diagram of FIG. 6 .

Fig. 8 is a schematic diagram of another application structure of a device for removing burrs in the inner cavity of a hard part according to an embodiment of the present invention.

FIG. 9 is a schematic cross-sectional structure diagram of FIG. 8 .

Detailed ways

In order to have a further understanding of the purpose, structure, features, and functions of the present invention, the following detailed descriptions are provided in conjunction with the embodiments.

Please refer to FIG. 1 to FIG. 3 , a device for removing burrs in the inner cavity of a hard part according to the present invention is used for removing burrs in the inner cavity of a hard part under the control of a numerically controlled machine tool (CNC). The device includes a connection unit 1, a drive unit 2 and an action unit 3. The connection unit 1 is connected to the handle of a CNC machine tool (not shown in the figure), the handle of the CNC machine tool is installed on the spindle of the CNC machine tool, and the drive unit 2 is set Inside the connection unit 1, the action unit 3 is arranged at the end of the connection unit 1 away from the handle of the CNC machine tool, and the drive unit 2 moves under the push of the cutting fluid sprayed by the spindle of the CNC machine tool flowing into the connection unit 1, and the action unit 3 is in the Driven by the drive unit 2, it contacts the inner cavity of the hard part to remove burrs.

The device for removing burrs in the inner cavity of hard parts uses the CNC machine tool spindle to spray cutting fluid and has a high hydraulic pressure as a programmable control power source. By setting the drive unit 2 inside the connection unit 1, the connection unit 1 is connected to the CNC machine tool. Under high hydraulic pressure, the drive unit 2 can be pushed to move, and the drive unit 2 drives the action unit 3 to move, so that the action unit 3 contacts the inner cavity of the hard part and completes the deburring operation. It is easy to use, improves the deburring efficiency, and ensures the hard parts. The quality stability of high-quality parts and products is improved, and labor is saved at the same time.

Please refer to Fig. 1 and Fig. 3 together, the connecting unit 1 includes a connecting rod 11, the middle part of the connecting rod 11 is provided with a liquid flow hole 111, the liquid flow hole 111 runs through the connecting rod 11, and the connecting rod 11 is away from the side wall of one end of the CNC machine tool handle A first groove 112 and a second groove 113 are arranged on the top, and the first groove 112 and the second groove 113 are arranged oppositely. Both the first groove 112 and the second groove 113 communicate with the liquid flow hole 111, and the first The groove depth of the groove 112 along the axial direction of the connecting rod 11 is smaller than the groove depth of the second groove 113 along the axial direction of the connecting rod 11, the driving unit 2 is arranged in the liquid flow hole 11, and the end of the action unit 3 close to the driving unit 2 is arranged on the At the position corresponding to the second groove 113 in the connecting rod 11, the cutting fluid sprayed by the spindle of the CNC machine tool flows into the liquid flow hole 111, pushing the driving unit 2 to move, and the driving unit 2 drives the action unit 3 to move and contact the inner cavity of the hard part. The cutting fluid flows to the action unit 3 through the gap between the drive unit 2 and the liquid flow hole 111 , which can lubricate and cool the action unit 3 and ensure the service life of the action unit 3 .

Please refer to FIG. 3 and FIG. 4, the driving unit 2 includes a driving member 21, a first connecting member 22, a first elastic member 23, a second connecting member 24 and a second elastic member 25, and the first connecting member 22 is fixed in the liquid flow On the inner wall of the hole 111, one end of the first elastic member 23 is connected to the first connecting member 23, and the other end of the first elastic member 23 is connected to the driving member 21, and the driving member 21 can be axially moved along the liquid flow hole 111. In the liquid flow hole 111, an accommodating groove 211 is arranged on the side wall of the driving member 21 close to the second groove 113, the second connecting member 24 is fixed on the groove wall of the accommodating groove 211, and one end of the second elastic member 25 is connected to the The second connecting piece 24 is connected, the other end of the second elastic piece 25 is connected with the action unit 3, the cutting fluid sprayed by the spindle of the CNC machine tool flows into the liquid flow hole 111, and pushes the driving member 21 to move axially along the liquid flow hole 111. The first elastic part 23 is in a stretched state, the driving part 21 drives the action unit 3 to move and contact the inner cavity of the hard part, the second elastic part 25 is in a stretched state, after the burr removal operation is completed, the spindle of the CNC machine tool stops spraying cutting fluid, and the second elastic part 25 is in a stretched state. The elastic member 25 drives the action unit 3 to reset, and the first elastic member 23 drives the driving member 21 to reset.

Preferably, both the first elastic member 23 and the second elastic member 25 are tension springs.

Preferably, please refer to FIG. 3 and FIG. 4 , the driving member 21 is provided with a fixing groove 212 at one end close to the first elastic member 23, and a connecting member 26 is fixed in the fixing groove 212, and the connecting member 26 is connected with the first elastic member 23, Thus, the connection between the driving member 21 and the first elastic member 23 is realized.

Preferably, please refer to FIG. 4 , the end of the accommodating groove 211 close to the action unit 3 is provided with a first slope 2111 , and the first slope 2111 is from the end away from the action unit 3 to the end close to the action unit 3 to the liquid flow hole close to it. The distance of the inner wall of 111 gradually decreases, and the minimum distance from the first inclined surface 2111 to the inner wall of the liquid flow hole 111 close to it is smaller than the outer diameter of the second elastic member 25, so that the second elastic member 25 can be kept in the initial state. It is placed between the groove 211 and the liquid flow hole 111 to prevent the second elastic member 25 from being affected by its own gravity.

Preferably, the end of the driving member 21 close to the first elastic member 23 is provided with a pressure relief port 213, and the pressure relief port 213 communicates with the accommodating groove 211 to ensure that the CNC machine tool spindle continuously sprays cutting fluid and removes burrs. The hydraulic pressure in the liquid flow hole 111 is in a safe range, and at the same time, it is convenient for the cutting fluid to flow to the action unit 3 to play the role of lubrication and cooling.

In actual use, there is a clearance fit between the driving member 21 and the liquid flow hole 111 , and the cutting fluid can flow from the gap between the driving member 21 and the liquid flow hole 111 to the action unit 3 for lubrication and cooling.

Please refer to FIG. 3 , FIG. 5 , FIG. 7 and FIG. 9 . The action unit 3 includes an action piece 31 and a guide piece 32 . position, the end of the action member 31 close to the driving member 21 is provided with a contact slope 311 facing the first groove 112, and the end of the contact slope 311 close to the first groove 112 is located in the first groove 112, and the contact slope 311 is close to the first groove. There is a first distance between one end of the groove 112 and the groove bottom surface of the first groove 112, so as to ensure that the moving part 31 has a movement margin, and can move under the drive of the moving part 21, and the contact slope 311 is close to the second groove 113. One end is provided with a connection protrusion 3111, the connection protrusion 3111 is connected with the second elastic member 25, the connection protrusion 3111 is in contact with the driving member 21, and the side wall of the action member 31 close to the first groove 112 is located in the first groove 112 The middle position of the action piece 31 is provided with a guide groove 312, one end of the guide piece 32 is fixed on the inner wall of one side of the liquid flow hole 111, and the other end of the guide piece 32 passes through the guide groove 312 and is fixed on the other side of the liquid flow hole 111. on one side of the inner wall.

The cutting fluid sprayed by the spindle of the CNC machine tool flows into the liquid flow hole 111, and pushes the driving part 21 to move axially along the liquid flow hole 111. Under the action of the guide groove 312, the end of the moving part 31 far away from the driving part 21 slides out from the first groove 112. One end slides fully out to engage the hard part cavity for deburring operations.

In order to improve the use stability of the action part 31 and ensure the deburring effect of the inner cavity of the hard parts, please refer to Fig. 1, Fig. 3 and Fig. 5 in conjunction. Two clamping parts 35, the first clamping part 34 and the second clamping part 35 are respectively located on both sides of the action part 31, so that the action part 31 is clamped between the first clamping part 34 and the second clamping part 35 During this period, the walls of the first groove 112 and the second groove 113 are in contact with the first clamping member 34, and the walls of the first groove 112 and the second groove 113 are in contact with the second clamping member 35. close, so that the first clamping piece 34, the action piece 31, and the second clamping piece 35 are clamped and fixed by the first groove 112 and the second groove 113, and the first clamping piece 34 is close to the first groove 112 The side wall is located in the first groove 112, and the side wall of the second clamping member 35 close to the first groove 112 is located in the first groove 112, so as to avoid affecting the contact between the action piece 31 and the inner cavity of the hard part. 31 is provided with a rotation hole 313 in the middle, a first connection hole (not shown in the figure) is provided on the first clamping member 34 corresponding to the rotation hole 313, and a first connection hole (not shown in the figure) is provided on the second clamping member 35 corresponding to the rotation hole 313. A second connection hole (not shown in the figure) is provided at the position, and a first fixing hole 114 and a second fixing hole (not shown in the figure) are provided on the side wall of the connecting rod 11 corresponding to the rotation hole 313. The rotating member 33 sequentially passes through the first fixing hole 114, the first connecting hole, the rotating hole 313, the second connecting hole, and the second fixing hole to connect the first clamping member 34, the action member 31, and the second clamping member 35 with the The rod 11 is connected, and the moving part 31 rotates around the fixed rotating part 33 driven by the driving part 21 .

Preferably, the guide groove 312 has an arc-shaped structure, and the central axis of the guide groove 312 is coaxially arranged with the central axis of the rotation hole 313, so that the rotating movement of the moving part 31 around the fixed rotating part 33 and the moving part 31 along the guiding groove 312 movement actions can be performed simultaneously.

Preferably, the end face of the first clamping part 34 away from the driving part 21 and the end face of the second clamping part 35 away from the driving part 21 are coplanar with the end face of the connecting rod 11 close to the action part 31, so as to ensure the use of the action part 31 While maintaining stability, the length of the device along the axial direction of the connecting rod 11 should be as small as possible.

In order to make the action piece 31 easily slide out from the first groove 112 under the driving of the driving piece 21, please refer to FIG. 3 and FIG. Thickness d2 of the side wall of the part 31 near the second groove 113, because the thickness of the side wall of the action part 31 near the first groove 112 is small, the action part 31 is easy to slide out from the first groove 112, thereby with Cavity contact of hard parts.

In actual use, the moving part 31 can be a cutter body, and the cutting fluid flows out from the gap between the driving part 21 and the liquid flow hole 111 and the pressure relief port 213 to lubricate and cool the cutter body to ensure the service life of the cutter body.

In order to form a higher hydraulic pressure in the liquid flow hole 111 when the spindle of the CNC machine tool sprays cutting fluid, please refer to FIG. Including the first part 1111, the second part 1112 and the third part 1113, the first part 1111, the second part 1112 and the third part 1113 communicate in sequence, the inner diameter of the first part 1111 is smaller than the inner diameter of the second part 1112, the inner diameter of the second part 1112 Smaller than the inner diameter of the third part 1113, both the first groove 112 and the second groove 113 communicate with the third part 1113, and the height of the third part 1113 along the axis of the connecting rod 11 is greater than that of the second groove 113 along the axis of the connecting rod 11. The groove is deep, the first connecting part 22 is fixed on the inner wall of the second part 1112 , and the driving part 21 is movably arranged in the third part 1113 .

Please refer to Fig. 6 and Fig. 7, Fig. 8 and Fig. 9 in combination. Fig. 6 and Fig. 7 are structural schematic diagrams of the device 100 for removing burrs in the inner cavity of hard parts 200, and Fig. 8 and Fig. 9 It is a structural schematic diagram of the device 100 for removing burrs from the inner cavity of a hard part 200 for removing burrs from the front side of the inner cavity of the hard part 200 . The cutting fluid sprayed by the spindle of the CNC machine tool flows into the liquid flow hole 111, and pushes the driving part 21 to move axially along the liquid flow hole 111. Under the action of the guide groove 312, the end of the moving part 31 far away from the driving part 21 slides out from the first groove 112. One end slides out completely, and contacts with the back or front of the inner cavity of the hard part 200 to perform deburring operation.

After the deburring operation is completed, the CNC machine tool spindle stops the sprayed cutting fluid, the second elastic part 25 drives the action part 31 to reset, and the first elastic part 23 drives the driving part 21 to reset. After the reset, the structure of the deburring device in the hard part inner cavity can be See Figure 3.

A device for removing burrs in the inner cavity of hard parts of the present invention uses the CNC machine tool spindle to spray cutting fluid and has a high hydraulic pressure as a programmable control power source. By setting the drive unit inside the connection unit, the connection unit is connected to the CNC machine tool. Under high hydraulic pressure, the drive unit can be pushed to move, and the drive unit drives the action unit to move, so that the action unit contacts the inner cavity of the hard part and completes the burr removal operation. It is easy to use, improves the burr removal efficiency, and ensures the hard part product. Quality stability, while saving labor.

The present invention has been described by the above-mentioned related embodiments, however, the above-mentioned embodiments are only examples for implementing the present invention. It must be pointed out that the disclosed embodiments do not limit the scope of the present invention. On the contrary, changes and modifications made without departing from the spirit and scope of the present invention all belong to the scope of patent protection of the present invention.

Claims (10)

1. A device for removing burrs in the inner cavity of hard parts, used to remove burrs in the inner cavity of hard parts under the control of a numerically controlled machine tool, characterized in that the device includes a connection unit, a drive unit and an action unit, and the connection unit It is connected with the handle of the CNC machine tool, the drive unit is arranged inside the connection unit, the action unit is arranged at the end of the connection unit away from the handle of the CNC machine tool, and the drive unit flows into the Driven by the drive unit, the action unit contacts the inner cavity of the hard part to remove burrs. 2. A device for removing burrs from the inner cavity of a hard part according to claim 1, wherein the connecting unit comprises a connecting rod, and a liquid flow hole is provided in the middle of the connecting rod, and the liquid flow hole penetrates The connecting rod is provided with a first groove and a second groove on the side wall of one end of the connecting rod away from the handle of the CNC machine tool, and the first groove and the second groove are oppositely arranged, so Both the first groove and the second groove communicate with the liquid flow hole, and the groove depth of the first groove along the axis of the connecting rod is smaller than that of the second groove along the axis of the connecting rod. The driving unit is arranged in the liquid flow hole, and the end of the action unit close to the driving unit is arranged in the connecting rod at a position corresponding to the second groove. 3. A device for removing burrs in the inner cavity of a hard part according to claim 2, wherein the drive unit includes a drive member, a first connecting member, a first elastic member, a second connecting member and a second elastic member part, the first connecting part is fixed on the inner wall of the liquid flow hole, one end of the first elastic part is connected to the first connecting part, and the other end of the first elastic part is connected to the driving part connected, the driving member is arranged in the liquid flow hole so as to move axially along the liquid flow hole, and the side wall of the driving member close to the second groove is provided with an accommodating groove, and the first Two connecting pieces are fixed on the groove wall of the accommodating groove, one end of the second elastic piece is connected with the second connecting piece, and the other end of the second elastic piece is connected with the action unit. 4. A device for removing burrs in the inner cavity of hard parts according to claim 3, wherein the action unit includes an action piece and a guide piece, and the end of the action piece close to the driving piece is arranged on the In the position corresponding to the second groove in the connecting rod, the end of the action member close to the driving member is provided with a contact slope facing the first groove, and the contact slope is close to the first groove. One end is located in the first groove, there is a first distance between the end of the contact slope close to the first groove and the bottom surface of the first groove, and the contact slope is close to the second groove One end of the groove is provided with a connecting protrusion, the connecting protrusion is connected with the second elastic member, the connecting protrusion is in contact with the driving member, and the moving member is close to the side wall of the first groove Located in the first groove, a guide groove is provided in the middle of the action member, one end of the guide member is fixed on the inner wall of one side of the liquid flow hole, and the other end of the guide member passes through the After the guide groove is fixed on the other inner wall of the liquid flow hole. 5. A device for removing burrs in the inner cavity of a hard part as claimed in claim 4, wherein the action unit further comprises a fixed rotating member, a first clamping member and a second clamping member, the first The clamping piece and the second clamping piece are respectively located on both sides of the action piece, and the groove walls of the first groove and the second groove are in contact with the first clamping piece, so The groove walls of the first groove and the second groove are in contact with the second clamping member, and the side wall of the first clamping member close to the first groove is located in the first groove In the groove, the side wall of the second clamping part close to the first groove is located in the first groove, the middle part of the action part is provided with a rotation hole, and the first clamping part is connected with the A first connection hole is provided at a position corresponding to the rotation hole, a second connection hole is provided at a position corresponding to the rotation hole on the second clamping member, and a second connection hole is provided on the side wall of the connecting rod corresponding to the rotation hole. A first fixing hole and a second fixing hole are provided at the position, and the fixed rotating member sequentially passes through the first fixing hole, the first connecting hole, the rotating hole, the second connecting hole, the The second fixing hole connects the first clamping piece, the action piece, the second clamping piece and the connecting rod. 6. A device for removing burrs from the inner cavity of a hard part according to claim 5, wherein the first clamping part is far away from the end face of the driving part, and the second clamping part is far away from the end face of the driving part. The end faces of the parts are coplanar with the end faces of the connecting rods close to the moving part. 7. A device for removing burrs in the inner cavity of a hard part as claimed in claim 5, wherein the guide groove has an arc-shaped structure, and the central axis of the guide groove is in common with the central axis of the rotating hole. axis settings. 8. A device for removing burrs in the inner cavity of a hard part according to claim 4, wherein the thickness of the side wall of the moving part close to the first groove is smaller than that of the side wall of the moving part close to the second groove. The thickness of the sidewall of the groove. 9. A device for removing burrs in the inner cavity of a hard part according to claim 4, wherein the liquid flow hole is sequentially arranged from an end far away from the first groove to an end close to the first groove It includes a first part, a second part and a third part, the first part, the second part and the third part communicate in sequence, the inner diameter of the first part is smaller than the inner diameter of the second part, and the second part The inner diameter of the part is smaller than the inner diameter of the third part, the first groove and the second groove are both in communication with the third part, and the height of the third part along the axial direction of the connecting rod is greater than that of the third part. The groove depth of the second groove along the axial direction of the connecting rod, the first connecting piece is fixed on the inner wall of the second part, and the driving part is movably arranged in the third part. 10. A device for removing burrs in the inner cavity of a hard part according to claim 3, wherein a pressure relief port is provided at the end of the driving member close to the first elastic member, and the pressure relief port is connected to the pressure relief port. The accommodating tank is connected.

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