Inner wall horn mouth cambered surface grinding device for thin-walled pipe die

Abstract

The utility model relates to the technical field of cast iron pipe dies, in particular to an inner wall horn mouth cambered surface polishing device for a thin-walled pipe die, which is used for polishing the inner wall of the pipe die and comprises an inner positioning group, an outer positioning group and a polishing group, the inner positioning group comprises an inner positioning support and an inner abutting block which is telescopically arranged in the inner positioning support, and the outer positioning group comprises an outer abutting block which is telescopically arranged in the inner positioning support. The inner abutting block abuts against the inner wall of the pipe die. The outer positioning set comprises an outer positioning support and an outer abutting block, and the outer abutting block abuts against the outer wall of the pipe die. The polishing set comprises a polishing support and a polishing head installed on the polishing support, the polishing head partially extends out of the polishing support and abuts against the inner wall of the pipe die, and the face, facing the pipe die, of the polishing head is consistent with the outline of the inner wall of the pipe die. In this way, the inner wall of the pipe die with the large inclination or the horn-mouth-shaped arc face is polished, one-time forming is achieved, and machining stability is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of cast iron pipe moulds, in particular to an inner wall bell mouth arc surface grinding device for thin-wall pipe moulds. Background Art

[0002] The inner wall of a cast iron pipe mold is typically designed with a certain slope. This facilitates the filling of molten iron into the mold during production, maintains fluidity, reduces the formation of bubbles and defects, and improves pipe quality and performance. Some mold ends even have a steeper slope, creating a bell-shaped shape. This steep slope reduces sharp angles and edges on the inner wall, thereby reducing the accumulation of corrosive media on the pipe's inner wall and extending its service life. Furthermore, for products operating in high-temperature or high-pressure environments, a steeper slope can alleviate stress concentration in the pipe, improving its load-bearing capacity and safety. Therefore, during the processing of the pipe mold, the inner wall of the pipe mold needs to be polished to ensure the slope. For example, Chinese patent CN116922210B discloses an inner wall polishing device for pipe mold processing, which includes a telescopic rod, a first mounting mechanism provided on the front side of the curved surface of the telescopic rod, a second mounting mechanism provided on the rear side of the curved surface of the telescopic rod, a sealing mechanism provided between the first and second mounting mechanisms, a material changing mechanism provided between the first and second mounting mechanisms, a grinding mechanism provided between the first, material changing, and second mounting mechanisms, and a centrifugal mechanism provided between the second and grinding mechanisms. The above patent uses the centrifugal mechanism to drive the grinding mechanism to rotate within the pipe mold, thereby achieving rapid polishing of different diameter areas of the pipe mold inner wall, forming a uniform, smooth slope. However, for pipe mold ends with excessive slopes, which have formed a bell-shaped shape, the grinding mechanism driven by centrifugal force not only requires increased centrifugal force, but also causes the die head of the polishing device to become unfit due to the large change in slope, which in turn reduces the smoothness of the pipe mold inner wall and affects product quality.

[0003] Therefore, a device for grinding the inner wall bell-mouth arc surface for a thin-walled tube mold is provided to grind the tube mold end portion on the inner wall of the thin-walled tube mold where the slope is too large and has formed a bell-mouth shape, so as to ensure the continuity and smoothness of the inner wall, which is what technical personnel in this field need to do. Utility Model Content

[0004] The purpose of the utility model is to provide a device for grinding the inner wall bell mouth arc surface of a thin-walled pipe mold, so as to solve the technical problem in the prior art that the inner wall of the thin-walled pipe mold has a bell mouth formed by excessive inclination, and the large change in inclination causes the die head of the grinding device to be unmatched, thereby causing the smoothness of the inner wall of the pipe mold to decrease, affecting the product quality.

[0005] The technical solution adopted by the utility model to solve its technical problems is: a device for grinding the inner wall bell-mouth arc surface of a thin-walled pipe mold, which is used to grind the inner wall of the pipe mold, including an inner positioning group, an outer positioning group and a grinding group rotatably arranged between the inner positioning group and the outer positioning group, the inner positioning group including an inner positioning bracket with a double-ring structure and an inner abutment block telescopically arranged in the inner positioning bracket, the inner abutment block abuts the inner wall of the pipe mold; the outer positioning group including an outer positioning bracket with a double-ring structure and an outer abutment block telescopically arranged in the outer positioning bracket, the outer abutment block abuts the outer wall of the pipe mold; the grinding group including a grinding bracket and a grinding head installed on the grinding bracket, the grinding head partially extends out of the grinding bracket and abuts the inner wall of the pipe mold, and the surface of the grinding head facing the pipe mold is consistent with the contour of the inner wall of the pipe mold.

[0006] Furthermore, the grinding bracket is provided with a plurality of mounting notches, which penetrate the outer ring wall of the grinding bracket. The opposite side walls of the mounting notch are inclined, and the opposite sides of the grinding head abut against the inclined side walls in the mounting notch. The grinding head is fitted and connected in the mounting notch and relatively fixed.

[0007] Furthermore, the inner positioning bracket includes an outer ring and an inner ring, which are coaxially arranged. A plurality of inner mounting holes are opened on the outer ring circumference of the inner positioning bracket, and the inner mounting holes penetrate the outer ring wall of the inner positioning bracket. The inner mounting holes are evenly distributed on the outer ring circumference of the inner positioning bracket; the inner abutment block is fitted and connected in the inner mounting hole and is slidably arranged.

[0008] Furthermore, a plurality of inner extension screw rods are installed on the inner positioning bracket, one inner extension screw rod faces an inner mounting hole, one end of the inner extension screw rod is threadedly fixedly connected to the inner circumferential surface of the inner positioning bracket, and the other end of the inner extension screw rod extends into the inner mounting hole.

[0009] Furthermore, the inner abutment block is slidably arranged on the inner extension screw rod, and the inner extension screw rod is threadedly connected with an inner locking piece, and the surface of the inner abutment block away from the inner wall of the tube mold abuts against the inner locking piece.

[0010] Furthermore, the outer positioning bracket includes an outer ring and an inner ring, which are coaxially arranged, and the end of the pipe mold is located between the outer ring and the inner ring, and the outer abutment block abuts against the outer wall of the pipe mold with the surface facing the inner ring.

[0011] Furthermore, a plurality of external mounting holes are formed on the outer circumferential surface of the outer positioning bracket, the external mounting holes penetrating the outer circumferential wall of the outer positioning bracket and evenly distributed on the outer circumferential surface of the outer positioning bracket. The external abutment block is fitted and connected in the external mounting holes and is slidably arranged.

[0012] Furthermore, a plurality of external extension screw rods are installed on the external positioning bracket, one external extension screw rod faces an external mounting hole, one end of the external extension screw rod is threadedly fixedly connected to the inner circumferential surface of the external positioning bracket, and the other end of the external extension screw rod extends into the external mounting hole.

[0013] Furthermore, the outer abutment block is slidably arranged on the outer extension screw rod, and the outer extension screw rod is threadedly connected with an outer locking piece. Two outer locking pieces are arranged on one outer extension screw rod, and the outer abutment block is located between the two outer locking pieces and abuts against each other.

[0014] Furthermore, a drive shaft is installed on the polishing bracket, one end of the drive shaft is connected to the inner positioning group, and the other end of the drive shaft passes through the outer positioning group and extends outward; the polishing bracket includes an outer ring and an inner ring, the outer ring and the inner ring are coaxially arranged, and the drive shaft is coaxially arranged with the inner ring of the polishing bracket and passes through the inner ring of the polishing bracket.

[0015] The beneficial effects of the present invention are as follows: by providing an internal positioning group and an external positioning group with similar structures, which are respectively installed on the inner and outer walls of the pipe mold, the present invention achieves dual positioning and clamping of the inner and outer parts of the pipe mold, facilitating subsequent grinding and ensuring processing accuracy and stability. At the same time, the present invention arranges the surface of the grinding head facing the pipe mold to be consistent with the contour of the inner wall of the pipe mold, thereby achieving grinding of the inner wall of the pipe mold with a large slope or a bell-shaped curved surface, achieving one-step molding, and ensuring processing stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a three-dimensional diagram of the inner wall bell mouth arc surface grinding device for thin-wall pipe molds of the present invention.

[0017] Figure 2 It is an exploded view of the inner wall bell mouth arc surface grinding device for thin-wall pipe molds of the present invention.

[0018] Figure 3 The utility model is a front view of the inner wall bell mouth arc surface grinding device for thin-wall pipe molds.

[0019] Figure 4 yes Figure 3 Cross-sectional view along AA.

[0020] Figure 5 yes Figure 4 Cross-sectional view along CC.

[0021] Figure 6 yes Figure 4 Cross-sectional view along BB.

[0022] The components in the accompanying drawings are marked as follows: 10. Internal positioning group; 11. Internal positioning bracket; 12. Internal mounting hole; 13. Internal abutment block; 14. Internal extension screw; 15. Internal locking member; 20. External positioning group; 21. External positioning bracket; 22. External mounting hole; 23. External abutment block; 24. External extension screw; 25. External locking member; 30. Grinding group; 31. Grinding bracket; 32. Grinding head; 33. Drive shaft; 34. Mounting notch; 40. Pipe mold. DETAILED DESCRIPTION

[0023] The present invention will now be described in detail with reference to the accompanying drawings. This drawing is a simplified schematic diagram, which only illustrates the basic structure of the present invention in a schematic manner, and therefore only shows the components related to the present invention.

[0024] See also Figure 1 、 Figure 2 The present invention provides a device for grinding the inner wall bell mouth arc surface of a thin-walled pipe mold, which is used to grind the inner wall of the pipe mold 40. The device comprises an inner positioning group 10, an outer positioning group 20, and a grinding group 30 rotatably arranged between the inner positioning group 10 and the outer positioning group 20. When in use, the inner positioning group 10 is installed in the pipe mold 40, the outer positioning group 20 is installed at the end of the pipe mold 40, and the grinding group 30 is connected in cooperation with the pipe mold 40 and abuts against the inner wall of the pipe mold 40. The present invention grinds the inner wall of the end of the pipe mold 40 by rotating the grinding group 30. The inner positioning group 10 and the outer positioning group 20 can achieve precise positioning of the grinding group 30, thereby ensuring the accuracy of processing.

[0025] See also Figure 4 、 Figure 5 The inner positioning group 10 includes an inner positioning bracket 11 with a double-ring structure and an inner abutment block 13 telescopically arranged in the inner positioning bracket 11. The outer wall of the inner positioning bracket 11 is matched with the inner wall of the pipe mold 40 to ensure that the inner positioning bracket 11 can be accurately positioned at the center of the inner wall of the pipe mold 40 during installation to ensure the accuracy of positioning. The inner abutment block 13 abuts against the inner wall of the pipe mold 40 to achieve rapid clamping.

[0026] In this embodiment, the inner positioning bracket 11 includes an outer ring and an inner ring (not shown in the figure), which are coaxially arranged. At the same time, reinforcing ribs are provided between the outer ring and the inner ring to ensure structural strength.

[0027] The outer circumferential surface of the inner positioning bracket 11 is provided with a plurality of inner mounting holes 12, which penetrate the outer circumferential wall of the inner positioning bracket 11 and are evenly distributed on the outer circumferential surface of the inner positioning bracket 11. The inner abutment block 13 is fitted and connected in the inner mounting holes 12 and is slidably arranged.

[0028] The inner positioning bracket 11 is provided with a plurality of inner extension screw rods 14, each inner extension screw rod 14 facing an inner mounting hole 12. One end of the inner extension screw rod 14 is threadedly fixedly connected to the inner circumferential surface of the inner positioning bracket 11, and the other end of the inner extension screw rod 14 extends into the inner mounting hole 12. Preferably, the axis of the inner extension screw rod 14 is perpendicular to the axis of the inner positioning bracket 11.

[0029] The inner abutment block 13 is slidably mounted on an inner extension screw 14. The surface of the inner abutment block 13 facing the inner wall of the tube mold 40 is curved, and the curvature of the curved surface of the inner abutment block 13 is consistent with the curvature of the inner wall of the tube mold 40. An inner locking member 15 is threadedly connected to the inner extension screw 14. The surface of the inner abutment block 13 away from the inner wall of the tube mold 40 abuts against the inner locking member 15. Preferably, the inner locking member 15 is a nut.

[0030] When in use, the internal positioning bracket 11 is installed into the tube mold 40, and by rotating the internal locking piece 15, the internal abutment block 13 moves along the axial direction of the internal extension screw 14, so that the outer arc surface of the internal abutment block 13 abuts against the inner wall of the tube mold 40, completing the clamping and positioning of the inside of the tube mold 40.

[0031] See also Figure 3 、 Figure 4 The external positioning group 20 includes an external positioning bracket 21 with a double-ring structure and an external abutment block 23 telescopically arranged in the external positioning bracket 21. The inner diameter of the external positioning bracket 21 is matched with the outer wall of the pipe mold 40 to ensure that the external positioning bracket 21 can be accurately positioned at the center of the outer wall of the pipe mold 40 during installation to ensure the accuracy of positioning. The external abutment block 23 abuts against the outer wall of the pipe mold 40 to achieve clamping.

[0032] In this embodiment, the outer positioning bracket 21 comprises an outer ring and an inner ring (not shown), which are coaxially arranged. Reinforcement ribs are provided between the outer and inner rings to ensure structural strength. The end of the tube mold 40 is positioned between the outer and inner rings, and the outer abutment block 23 abuts the outer wall of the tube mold 40 with its surface facing the inner ring.

[0033] The outer circumferential surface of the outer positioning bracket 21 is provided with a plurality of outer mounting holes 22, which penetrate the outer circumferential wall of the outer positioning bracket 21 and are evenly distributed on the outer circumferential surface of the outer positioning bracket 21. The outer abutment blocks 23 are fitted and connected in the outer mounting holes 22 and are slidably arranged.

[0034] The outer positioning bracket 21 is provided with a plurality of outer extension screw rods 24, each of which is opposite to one of the outer mounting holes 22. One end of the outer extension screw rod 24 is threadedly fixedly connected to the inner circumferential surface of the outer positioning bracket 21, and the other end of the outer extension screw rod 24 extends into the outer mounting hole 22. Preferably, the axis of the outer extension screw rod 24 is perpendicular to the axis of the outer positioning bracket 21.

[0035] The outer abutment block 23 is slidably mounted on the outer extension screw 24. The surface of the outer abutment block 23 facing the outer wall of the tube mold 40 is curved, and the curvature of the outer abutment block 23 is consistent with the curvature of the outer wall of the tube mold 40. An outer locking member 25 is threadedly connected to the outer extension screw 24. Two outer locking members 25 are provided on each outer extension screw 24. The outer abutment block 23 is located between the two outer locking members 25 and abuts against each other. Preferably, the outer locking member 25 is a nut.

[0036] When in use, the external positioning bracket 21 is installed into the pipe mold 40, and by rotating the external locking piece 25, the external abutment block 23 moves along the axial direction of the external extension screw 24, so that the arc surface of the external abutment block 23 abuts the outer wall of the pipe mold 40, completing the clamping and positioning of the outside of the pipe mold 40.

[0037] The utility model provides an inner positioning group 10 and an outer positioning group 20 with similar structures, which are respectively installed on the inner wall and outer wall of the pipe mold 40, thereby realizing dual positioning and clamping of the inside and outside of the pipe mold 40, facilitating subsequent grinding and ensuring processing accuracy and stability.

[0038] Since the outer abutment block 23 only partially abuts against the outer wall of the tube mold 40, after the outer abutment block 23 is subjected to pressure from the outer locking piece 25, a large offset will occur between the axis of the outer locking piece 25 and the outer extension screw rod 24, thereby affecting the stability and service life of the outer abutment block 23. The utility model adds another outer locking piece 25 to abut the outer abutment block 23 from another direction, and then clamps the outer abutment block 23 between the two outer locking pieces 25, thereby improving the force uniformity of the outer abutment block 23, and improving the stability and service life.

[0039] See also Figure 2 、 Figure 4 、 Figure 6 The polishing assembly 30 includes a polishing bracket 31 and a polishing head 32 mounted on the polishing bracket 31. The polishing head 32 partially extends from the polishing bracket 31 and abuts the inner wall of the tube mold 40. A drive shaft 33 is mounted on the polishing bracket 31. The drive shaft 33 is used to drive the polishing bracket 31 to rotate, thereby driving the polishing head 32 to rotate, thereby polishing the inner wall of the tube mold 40.

[0040] In this embodiment, the polishing bracket 31 includes an outer ring and an inner ring (not shown), which are coaxially arranged. Reinforcement ribs are provided between the outer ring and the inner ring to ensure structural strength. The outer contour of the outer ring of the polishing bracket 31 is consistent with the inner wall contour of the tube mold 40.

[0041] The drive shaft 33 is fixedly connected to the grinding bracket 31 by a linkage device such as a key. The drive shaft 33 is coaxially arranged with the inner ring of the grinding bracket 31 and passes through the inner ring of the grinding bracket 31. One end of the drive shaft 33 is connected to the inner positioning group 10, and the other end of the drive shaft 33 passes through the outer positioning group 20 and extends outward.

[0042] Specifically, one end of the drive shaft 33 is rotatably disposed on the inner ring of the inner positioning bracket 11 by means of a bearing, and the other end of the drive shaft 33 is rotatably disposed on the inner ring of the outer positioning bracket 21 by means of a bearing and extends outward.

[0043] The present invention further comprises a motor (not shown), and one end of the drive shaft 33 extending out of the external positioning bracket 21 is fixedly connected to the output shaft of the motor, thereby realizing power input to the drive shaft 33 .

[0044] In this embodiment, the grinding head 32 is a block-shaped structure, and the surface of the grinding head 32 facing the tube mold 40 is consistent with the inner wall contour of the tube mold 40, so as to achieve grinding of the inner wall of the tube mold 40 with a larger slope or the bell-shaped arc surface, realize one-time molding, and ensure the stability of processing.

[0045] The outer circumferential surface of the polishing bracket 31 is provided with a plurality of mounting notches 34, which penetrate the outer circumferential wall of the polishing bracket 31 and are evenly distributed on the outer circumferential surface of the polishing bracket 31. The polishing head 32 is fitted and connected in the mounting notches 34 and is relatively fixed.

[0046] In this embodiment, the two opposite side walls on the mounting notch 34 are arranged at an angle, and the opposite sides of the grinding head 32 abut against the two side walls arranged at an angle in the mounting notch 34, so that the operator can quickly install and disassemble, reduce unnecessary disassembly, and improve processing efficiency; the end face of the grinding head 32 and the end face of the grinding bracket 31 are detachably connected by fasteners such as bolts or screws, so as to ensure that the grinding head 32 is fixed relative to the grinding bracket 31, thereby ensuring stability during the processing process.

[0047] In another embodiment, the grinding head 32 is composed of a plurality of sheet-like abrasives, such as commonly available louvered abrasives. The multiple grinding heads 32 are stacked and removably connected within the mounting notch 34 using fasteners such as bolts or screws. This stacking of the multiple grinding heads 32 allows the grinding heads 32 to better adapt to the inner wall contour of the tube mold 40, facilitating adjustment of the grinding depth and increasing the grinding range. Furthermore, the sheet-like structure of the grinding heads 32 offers a certain degree of deformability, facilitating installation and ensuring convenient processing.

[0048] The specific operation method of the present invention is as follows: Step 1: Install the inner positioning bracket 11 into the pipe mold 40, and rotate the inner locking member 15 so that the inner abutting block 13 abuts against the inner wall of the pipe mold 40 to complete the internal clamping and positioning.

[0049] Step 2: Install the grinding head 32 on the grinding bracket 31, install the drive shaft 33, and then connect the grinding group 30 to the pipe mold 40 so that the grinding head 32 abuts the inner wall of the pipe mold 40 to complete the preparatory work.

[0050] Step 3: Install the external positioning bracket 21 into the pipe mold 40, and rotate the external locking member 25 so that the external abutting block 23 abuts against the outer wall of the pipe mold 40 to complete the external clamping and positioning.

[0051] Step 4: Fixedly connect the drive shaft 33 to the output shaft of the motor, start the motor, and the drive shaft 33 rotates accordingly, thereby driving the grinding group 30 to rotate in the pipe mold 40 to grind the inner wall of the pipe mold 40.

[0052] The present invention provides a similarly structured inner and outer positioning assembly 10 and 20, mounted on the inner and outer walls of the tube mold 40, respectively, thereby achieving dual positioning and clamping of the tube mold 40, both inside and outside. This facilitates subsequent polishing and ensures machining accuracy and stability. Furthermore, the present invention configures the surface of the polishing head 32 facing the tube mold 40 to conform to the contour of the inner wall of the tube mold 40, thereby enabling polishing of the inner wall of the tube mold 40 with a large slope or a bell-shaped curved surface, achieving one-step molding and ensuring machining stability.

[0053] It is understood that the present invention is described by way of certain embodiments, and those skilled in the art will appreciate that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. Furthermore, under the guidance of the present invention, these features and embodiments may be modified to suit specific circumstances and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are intended to be protected by the present invention.

Claims

1. A device for grinding the inner wall bell mouth arc surface of a thin-walled pipe mold, used for grinding the inner wall of a pipe mold (40), comprising an inner positioning group (10), an outer positioning group (20), and a grinding group (30) rotatably arranged between the inner positioning group (10) and the outer positioning group (20), characterized in that: The inner positioning group (10) includes an inner positioning bracket (11) with a double-ring structure and an inner abutting block (13) telescopically arranged in the inner positioning bracket (11), and the inner abutting block (13) abuts against the inner wall of the pipe mold (40); the outer positioning group (20) includes an outer positioning bracket (21) with a double-ring structure and an outer abutting block (23) telescopically arranged in the outer positioning bracket (21), and the outer abutting block (23) abuts against the outer wall of the pipe mold (40); the grinding group (30) includes a grinding bracket (31) and a grinding head (32) mounted on the grinding bracket (31), the grinding head (32) partially extends out of the grinding bracket (31) and abuts against the inner wall of the pipe mold (40), and the surface of the grinding head (32) facing the pipe mold (40) is consistent with the contour of the inner wall of the pipe mold (40).

2. The inner wall bell mouth arc surface grinding device for thin-walled pipe mold according to claim 1 is characterized in that: The polishing bracket (31) is provided with a plurality of mounting notches (34), the mounting notches (34) passing through the outer ring wall of the polishing bracket (31), the opposite side walls of the mounting notches (34) being arranged in an inclined manner, the opposite sides of the polishing head (32) being in contact with the two side walls arranged in an inclined manner in the mounting notches (34), and the polishing head (32) being fitted and connected in the mounting notches (34) and relatively fixed.

3. The inner wall bell mouth arc surface grinding device for thin-walled pipe mold according to claim 1 is characterized in that: The inner positioning bracket (11) includes an outer ring and an inner ring, and the outer ring and the inner ring are coaxially arranged. A plurality of inner mounting holes (12) are opened on the outer circumferential surface of the inner positioning bracket (11), and the inner mounting holes (12) pass through the outer circumferential wall of the inner positioning bracket (11). The inner mounting holes (12) are evenly distributed on the outer circumferential surface of the inner positioning bracket (11); the inner abutment block (13) is fitted and connected in the inner mounting hole (12) and is slidably arranged.

4. The inner wall bell mouth arc surface grinding device for thin-walled pipe mold according to claim 3 is characterized in that: A plurality of inner extension screw rods (14) are installed on the inner positioning bracket (11), one inner extension screw rod (14) faces an inner mounting hole (12), one end of the inner extension screw rod (14) is threadedly fixedly connected to the inner circumferential surface of the inner positioning bracket (11), and the other end of the inner extension screw rod (14) extends into the inner mounting hole (12).

5. The inner wall bell mouth arc surface grinding device for thin-walled pipe mold according to claim 4 is characterized in that: The inner abutment block (13) is slidably arranged on the inner extension screw rod (14), and the inner extension screw rod (14) is threadedly connected with an inner locking piece (15). The surface of the inner abutment block (13) away from the inner wall of the pipe mold (40) abuts against the inner locking piece (15).

6. The inner wall bell mouth arc surface grinding device for thin-walled pipe mold according to claim 1 is characterized in that: The outer positioning bracket (21) includes an outer ring and an inner ring, which are coaxially arranged. The end of the pipe mold (40) is located between the outer ring and the inner ring, and the outer abutment block (23) abuts against the outer wall of the pipe mold (40) facing the surface of the inner ring.

7. The inner wall bell mouth arc surface grinding device for thin-walled pipe mold according to claim 6 is characterized in that: A plurality of external mounting holes (22) are provided on the outer circumferential surface of the external positioning bracket (21), the external mounting holes (22) penetrate the outer circumferential wall of the external positioning bracket (21), and the external mounting holes (22) are evenly distributed on the outer circumferential surface of the external positioning bracket (21). The external abutment blocks (23) are fitted and connected in the outer mounting holes (22) and are slidably arranged.

8. The inner wall bell mouth arc surface grinding device for thin-walled pipe mold according to claim 7 is characterized in that: A plurality of external extension screw rods (24) are mounted on the external positioning bracket (21), one external extension screw rod (24) faces an external mounting hole (22), one end of the external extension screw rod (24) is threadedly fixedly connected to the inner circumferential surface of the external positioning bracket (21), and the other end of the external extension screw rod (24) extends into the external mounting hole (22).

9. The inner wall bell mouth arc surface grinding device for thin-walled pipe mold according to claim 8, characterized in that: The outer abutment block (23) is slidably arranged on the outer extension screw rod (24), and the outer extension screw rod (24) is threadedly connected with an outer locking piece (25). Two outer locking pieces (25) are arranged on one outer extension screw rod (24), and the outer abutment block (23) is located between the two outer locking pieces (25) and abuts against each other.

10. The inner wall bell mouth arc surface grinding device for thin-walled pipe mold according to claim 1, characterized in that: A driving shaft (33) is mounted on the polishing bracket (31), one end of the driving shaft (33) is cooperatively connected to the inner positioning group (10), and the other end of the driving shaft (33) passes through the outer positioning group (20) and extends outward; the polishing bracket (31) comprises an outer ring and an inner ring, the outer ring and the inner ring are coaxially arranged, and the driving shaft (33) is coaxially arranged with the inner ring of the polishing bracket (31) and passes through the inner ring of the polishing bracket (31).

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