An expansion type inner wall shaping device

Abstract

The present invention discloses an expansion type inner wall shaping device, which aims to provide an expansion type inner wall shaping device which can not only effectively simplify the shaping steps and improve the shaping efficiency, but also effectively improve the shaping quality of the inner circle of the circular product. It comprises a frame, which comprises a base frame and a working platform arranged on the base frame; a rotating platform, which is arranged on the working platform by rotating through a vertical shaft rod; a rotating driving mechanism, which is used to drive the rotating platform to rotate around the vertical shaft rod; an expansion shaping device, which comprises a plurality of radial guide grooves arranged on the rotating platform, sliders arranged on the radial guide grooves in a one-to-one correspondence, shaping blocks arranged on the sliders in a one-to-one correspondence, and a synchronous pushing mechanism for driving each slider to synchronously move along the corresponding radial guide grooves, each radial guide groove is circumferentially distributed around the vertical shaft rod, and the side of the shaping block facing away from the vertical shaft rod is a circular arc shaping surface.

Description

Technical Field

[0001] The invention relates to a shaping device, in particular to an expansion type inner wall shaping device. Background Art

[0002] The current multi-petal support ring combination shaping device is generally used to shape the inner wall of a circular product. The multi-petal support ring combination shaping device comprises a plurality of circular arc support rings evenly distributed in the circumferential direction, and an adjusting device is arranged at the gap between two adjacent circular arc support rings. The adjusting device is generally a screw rod, and the two ends of the screw rod are connected to the ends of two adjacent arc support rings by threads. The size of the gap between the two adjacent arc support rings is adjusted by rotating the screw rod, and a shaping force is applied to the inner wall of the circular product, thereby achieving the purpose of shaping the inner circle of the circular product; the specific operation is as follows: (i) the multi-petal support ring combination shaping device is placed in the circular product, and then the size of the gap between the two adjacent arc support rings is adjusted by rotating the screw rods one by one, so that the arc support rings are stretched outward and a shaping force is applied to the inner wall of the circular product; then, the size of the gap between the two adjacent arc support rings is adjusted by rotating the screw rods one by one, so that the arc support rings are moved inward and separated from the circular product; (ii) the multi-petal support ring combination shaping device or the circular product is rotated at a certain angle, so that the unshaped part of the circular product is staggered with the gap between the two adjacent arc support rings; (iii) return to step (i), thereby achieving the purpose of shaping the entire inner circle of the circular product.

[0003] At present, this multi-petal support ring combination shaping device needs to adjust multiple screws when in use, which not only complicates the operation steps and affects the shaping efficiency; but also makes it difficult to ensure that the arc support rings are opened outward synchronously, so that during the process of the arc support rings opening outward, the outer circumferential surfaces of the arc support rings cannot be guaranteed to be in the same cylindrical surface, affecting the shaping quality of the inner circle of the circular product. Summary of the invention

[0004] The purpose of the present invention is to provide an expandable inner wall shaping device which can not only effectively simplify the shaping steps and improve the shaping efficiency, but also effectively improve the shaping quality of the inner circle of a circular product.

[0005] The technical solution of the present invention is:

[0006] An expansion type inner wall shaping device, comprising:

[0007] A frame, the frame comprising a base frame and a working platform arranged on the base frame;

[0008] A rotating platform, which is rotatably arranged on the working platform through a vertical shaft;

[0009] A rotary drive mechanism, which is arranged on the frame and is used to drive the rotary platform to rotate around the vertical shaft;

[0010] The expansion and shaping device includes a plurality of radial guide grooves arranged on a rotating platform, sliders arranged one by one on the radial guide grooves, shaping blocks arranged one by one on the sliders, and a synchronous pushing mechanism for driving each slider to move synchronously along the corresponding radial guide grooves. Each radial guide groove is distributed circumferentially around the vertical shaft rod, and the radial guide grooves are distributed along the radial extension of the vertical shaft rod. The side of the shaping block facing away from the vertical shaft rod is an arc-shaped shaping surface.

[0011] Compared with the prior art multi-petal support ring combination shaping device, in which it is difficult to ensure that each circular arc support ring is synchronously expanded outward, so that the outer peripheral surface of each circular arc support ring cannot be guaranteed to be in the same cylindrical surface during the expansion process, which affects the shaping quality of the inner circle of the circular product; the expansion inner wall shaping device of this scheme drives each slider to move synchronously along the corresponding radial guide groove through a synchronous push mechanism, so that each shaping block moves synchronously along the corresponding radial guide groove, thereby ensuring that the shaping surface of each shaping block always remains distributed on the same cylindrical surface, thereby effectively improving the shaping quality of the inner circle of the circular product. On the other hand, by driving each slider to move synchronously along the corresponding radial guide groove through a synchronous push mechanism (without step-by-step adjustment of multiple screws), it is also possible to simplify the shaping steps and improve the shaping efficiency.

[0012] Preferably, a guide through hole coaxially distributed with the vertical shaft is provided in the vertical shaft, and the synchronous push mechanism comprises a vertical push rod sliding along the guide through hole and a connecting rod corresponding to the slider one by one, one end of the connecting rod is hingedly connected to the vertical push rod, and the other end of the connecting rod is hingedly connected to the corresponding slider. In this way, by moving the vertical shaft up and down along the guide through hole, the synchronous movement of each shaping block along the corresponding radial guide groove can be achieved.

[0013] Preferably, the synchronous pushing mechanism also includes a self-unlocking pushing and locking mechanism, the vertical pushing rod is provided with an upper block and a lower block, the upper block is located above the rotating platform, and the lower block is located below the vertical shaft rod, the self-unlocking pushing and locking mechanism includes an arc-shaped limiting groove with an opening facing upward arranged on the working platform, a limiting rod arranged on the rotating platform and cooperating with the arc-shaped limiting groove, a pushing rod reset spring located between the rotating platform and the block, a lower end plate arranged at the lower end of the vertical pushing rod, two locking holes arranged on the upper surface of the lower end plate, and a locking spring arranged on the base frame. The vertical guide sleeve, a vertical guide column sliding along the vertical guide sleeve, an upper floating plate located between the lower end plate and the lower stop block, a lower floating plate located below the vertical guide sleeve, and a locking rod arranged on the upper surface of the upper floating plate for cooperating with the locking hole, the limiting rod extends into the arc limiting groove, the vertical guide column connects the upper floating plate and the lower floating plate as a whole, the lower stop block abuts against the lower end of the vertical shaft rod under the action of the push rod reset spring, the synchronous pushing mechanism also includes a vertical cylinder fixed to the base frame, and the piston rod of the vertical cylinder is connected to the lower floating plate or the upper floating plate;

[0014] When the lower floating plate abuts against the lower end of the vertical guide sleeve, the locking rod is located above the lower end plate;

[0015] When the lower floating plate abuts against the lower end of the vertical guide sleeve and the limiting rod abuts against one end of the arc-shaped limiting groove, the locking rod is located just above one of the locking holes;

[0016] When the lower floating plate abuts against the lower end of the vertical guide sleeve and the limiting rod abuts against the other end of the arc-shaped limiting groove, the locking rod is located just above the other locking hole.

[0017] When the vertical push rod moves upward along the guide through hole, the connecting rod drives the corresponding slider and the shaping block to move inward along the radial guide groove; when the vertical push rod moves downward along the guide through hole, the connecting rod drives the corresponding slider and the shaping block to move outward along the radial guide groove.

[0018] The expandable inner wall shaping device of the present application applies a shaping force to the inner circle of the circular product through the shaping surface of the shaping block. During the shaping process, the operator may be negligent in controlling the rotating platform of the rotating drive mechanism and the shaping block of the expansion shaping device to rotate around the vertical shaft, thereby affecting the normal operation of the equipment and even causing damage to the equipment and scratching of the inner circle of the circular product by the shaping block, thereby affecting the shaping quality of the inner circle of the circular product. In order to solve this problem, the present solution provides a self-unlocking sliding locking mechanism, which can effectively solve the above-mentioned problem without affecting the normal operation of the expandable inner wall shaping device (see the specific embodiment below for details).

[0019] Preferably, the vertical push rod is also provided with an upper limit block, which is located above the rotating platform. In this way, the downward movement distance of the vertical push rod can be limited by the upper limit block, thereby limiting the distance that the shaping block slides outward along the radial guide groove.

[0020] Preferably, the rotary drive mechanism comprises a drive motor disposed on the base frame and a gear transmission mechanism connecting the vertical shaft and the output shaft of the drive motor.

[0021] Preferably, a platform groove is provided on the upper surface of the working platform, the rotating platform is located in the platform groove, and the shaping surface of the shaping block is located above the upper surface of the working platform.

[0022] Preferably, the distance between the lower edge of the shaping surface and the upper surface of the working platform is less than 1 mm.

[0023] Preferably, the platform groove is circular, the rotating platform is also circular, and the platform groove and the rotating platform are coaxially distributed.

[0024] Preferably, the radial guide groove is a T-shaped groove or a dovetail groove, and the slider is correspondingly a T-shaped slider or a dovetail slider.

[0025] The beneficial effects of the present invention are: not only can the shaping steps be effectively simplified and the shaping efficiency be improved; but also the shaping quality of the inner circle of the circular product can be effectively improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural schematic diagram of the expansion type inner wall shaping device of the present invention.

[0027] Figure 2 yes Figure 1 Top view of the .

[0028] Figure 3 It is a structural schematic diagram of a slider and a shaping block of the expansion type inner wall shaping device of the present invention.

[0029] Working platform 1, platform groove 1.1;

[0030] Rotating platform 2, vertical shaft 2.1;

[0031] Driving motor 3.1, gear transmission mechanism 3.2;

[0032] Radial guide groove 4.0, slider 4.1, shaping block 4.2, vertical push rod 4.3, connecting rod 4.4, upper stopper 4.5, lower stopper 4.6, upper limit block 4.7, shaping surface 4.8;

[0033] Vertical guide sleeve 5.1, vertical guide column 5.2, upper floating plate 5.3, lower floating plate 5.4, lower end plate 5.5, locking hole 5.6, locking rod 5.7, push rod return spring 5.8, arc-shaped limiting groove 5.9, limiting rod 5.10. DETAILED DESCRIPTION

[0034] Specific embodiment 1: Figure 1 , Figure 2 , Figure 3 As shown, an expansion type inner wall shaping device includes a frame, a rotating platform, a rotating drive mechanism and an expansion shaping device. The frame includes a base frame and a working platform 1 arranged on the base frame. In this embodiment, the upper surface of the working platform is horizontally distributed. The rotating platform 2 is rotatably arranged on the working platform through a vertical shaft 2.1. In this embodiment, the rotating platform is composed of a horizontally distributed flat plate. The rotating drive mechanism is arranged on the frame, and is used to drive the rotating platform to rotate around the vertical shaft.

[0035] The expansion shaping device includes a plurality of radial guide grooves 4.0 arranged on a rotating platform, sliders 4.1 arranged on the radial guide grooves in a one-to-one manner, shaping blocks 4.2 arranged on the sliders in a one-to-one manner, and a synchronous push mechanism for driving each slider to move synchronously along the corresponding radial guide grooves. The vertical shaft is vertically distributed. In this embodiment, a guide through hole coaxially distributed with the vertical shaft is provided in the vertical shaft. Each radial guide groove is circumferentially distributed around the vertical shaft. The radial guide groove is distributed along the radial extension of the vertical shaft. The side of the shaping block facing away from the vertical shaft is a circular arc-shaped shaping surface 4.8. The axis of the shaping surface is coaxially distributed with the vertical shaft. The shaping surfaces of each shaping block are distributed on the same cylindrical surface. The synchronous push mechanism includes a vertical push rod 4.3 sliding along the guide through hole and a connecting rod 4.4 corresponding to the sliders in a one-to-one manner, one end of the connecting rod is hingedly connected to the vertical push rod, and the other end of the connecting rod is hingedly connected to the corresponding slider. In this embodiment, one end of the connecting rod is inclined upward, and the other end of the connecting rod is inclined downward.

[0036] The specific operation of the expandable inner wall shaping device of this embodiment is as follows:

[0037] (i) supporting the round product to be shaped (e.g., cylindrical product) on the upper surface of the working platform, and positioning each shaping block inside the round product;

[0038] Then, the synchronous pushing mechanism is used to drive each slider and the shaping block to move synchronously outward along the corresponding radial guide groove, and a shaping force is applied to the inner wall of the circular product, thereby achieving the purpose of shaping the inner circle of the circular product; at the same time, in this process, the shaping surfaces of each shaping block are always kept distributed on the same cylindrical surface, thereby improving the shaping quality of the inner circle of the circular product, and effectively solving the problem that the arc support rings of the multi-petal support ring combination shaping device in the prior art are difficult to ensure that they are synchronously expanded outward, and the outer circumferential surfaces of each arc support ring cannot be guaranteed to be in the same cylindrical surface, which affects the shaping quality of the inner circle of the circular product.

[0039] Next, the synchronous pushing mechanism drives each slider and the shaping block to move synchronously inward along the corresponding radial guide groove, so that the shaping block is separated from the round product;

[0040] (ii) the rotary drive mechanism drives the rotary platform and the shaping blocks on the rotary platform to rotate around the vertical shaft to a set angle;

[0041] (iii) The synchronous pushing mechanism is used to drive the sliders and the shaping blocks to move synchronously outward along the corresponding radial guide grooves, and a shaping force is applied to the inner wall of the circular product, thereby achieving the purpose of shaping the inner circle of the circular product; then, the synchronous pushing mechanism is used to drive the sliders and the shaping blocks to move synchronously inward along the corresponding radial guide grooves, so that the shaping blocks are separated from the circular product; and then the circular product can be taken out.

[0042] Compared with the prior art multi-petal support ring combination shaping device, in which it is difficult to ensure that each circular arc support ring is synchronously expanded outward, so that the outer peripheral surface of each circular arc support ring cannot be guaranteed to be in the same cylindrical surface during the expansion process, which affects the shaping quality of the inner circle of the circular product; the expansion inner wall shaping device of this scheme drives each slider to move synchronously along the corresponding radial guide groove through a synchronous push mechanism, so that each shaping block moves synchronously along the corresponding radial guide groove, thereby ensuring that the shaping surface of each shaping block always remains distributed on the same cylindrical surface, thereby effectively improving the shaping quality of the inner circle of the circular product. On the other hand, by driving each slider to move synchronously along the corresponding radial guide groove through a synchronous push mechanism (without step-by-step adjustment of multiple screws), it is also possible to simplify the shaping steps and improve the shaping efficiency.

[0043] Specifically, Figure 1 , Figure 2 As shown, the rotary drive mechanism comprises a drive motor 3.1 arranged on the base frame and a gear transmission mechanism 3.2 connecting the vertical shaft and the output shaft of the drive motor.

[0044] The radial guide groove is a T-shaped groove or a dovetail groove, and the slider is a T-shaped slider or a dovetail slider correspondingly.

[0045] The upper surface of the working platform is provided with a platform groove 1.1. The rotating platform is located in the platform groove. The platform groove is circular, the rotating platform is also circular, and the platform groove and the rotating platform are coaxially distributed. The shaping surface of the shaping block is located above the upper surface of the working platform. The spacing between the lower edge of the shaping surface and the upper surface of the working platform is 1 mm, 0.5 mm, 0.4 mm, 0.3 mm, or 0.1 mm.

[0046] Further, such as Figure 1 , Figure 2 , Figure 3 As shown, the synchronous push mechanism also includes a self-unlocking push locking mechanism. An upper stopper 4.5 and a lower stopper 4.6 are provided on the vertical push rod. The upper stopper is located above the rotating platform, and the lower stopper is located below the vertical shaft rod. An upper limit block 4.7 is also provided on the vertical push rod, and the upper limit block is located above the rotating platform. The upper limit block is located below the upper stopper. The self-unlocking sliding locking mechanism includes an arc-shaped limit groove 5.9 with an opening facing upward, a limit rod 5.10 arranged on the rotating platform and cooperating with the arc-shaped limit groove, a push rod return spring 5.8 located between the rotating platform and the stopper, a lower end plate 5.5 arranged at the lower end of the vertical push rod, two locking holes 5.6 arranged on the upper surface of the lower end plate, a vertical guide sleeve 5.1 arranged on the base frame, a vertical guide column 5.2 sliding along the vertical guide sleeve, an upper floating plate 5.3 located between the lower end plate and the lower stopper, a lower floating plate 5.4 located below the vertical guide sleeve, and a locking rod 5.7 arranged on the upper surface of the upper floating plate for cooperating with the locking hole.

[0047] The arc-shaped limit groove is coaxially distributed with the vertical shaft rod. The limit rod is vertically distributed. The limit rod extends into the arc-shaped limit groove to limit the rotation angle of the rotating platform. In this embodiment, the arc-shaped limit groove is arranged on the bottom surface of the platform groove.

[0048] The vertical guide column connects the upper floating plate and the lower floating plate as a whole. In this embodiment, a push rod opening is provided on the upper floating plate, and the lower end of the vertical push rod passes through the push rod opening. The push rod reset spring is sleeved on the vertical push rod. The lower block abuts against the lower end of the vertical shaft rod under the action of the push rod reset spring. The synchronous push mechanism also includes a vertical cylinder 6 fixed to the base frame, and the piston rod of the vertical cylinder is connected to the lower floating plate or the upper floating plate. In this embodiment, the piston rod of the vertical cylinder is connected to the lower floating plate.

[0049] When the lower floating plate abuts against the lower end of the vertical guide sleeve, the locking rod is located above the lower end plate.

[0050] When the lower floating plate abuts against the lower end of the vertical guide sleeve and the limiting rod abuts against one end of the arc-shaped limiting groove, the locking rod is located just above one of the locking holes.

[0051] When the lower floating plate abuts against the lower end of the vertical guide sleeve and the limiting rod abuts against the other end of the arc-shaped limiting groove, the locking rod is located just above the other locking hole.

[0052] When the vertical push rod moves upward along the guide through hole, the connecting rod drives the corresponding slider and the shaping block to move inward along the radial guide groove. When the vertical push rod moves downward along the guide through hole, the connecting rod drives the corresponding slider and the shaping block to move outward along the radial guide groove.

[0053] In the expansion type inner wall shaping device of this embodiment, the shaping surface of the shaping block applies shaping force to the inner circle of the circular product. During the shaping process, due to the negligence of the operator, the rotating platform of the rotating drive mechanism and the shaping block of the expansion shaping device may rotate around the vertical shaft rod, which may affect the normal operation of the equipment and even cause damage to the equipment and scratches of the inner circle of the circular product by the shaping block, affecting the shaping quality of the inner circle of the circular product. In order to solve this problem, this embodiment is provided with a self-unlocking sliding locking mechanism, which can effectively solve the above-mentioned problem without affecting the normal operation of the expansion type inner wall shaping device. Specifically,

[0054] The rotary driving mechanism drives the rotary platform to rotate, so that the limiting rod abuts against one end of the arc-shaped limiting groove, or the limiting rod abuts against the other end of the arc-shaped limiting groove.

[0055] In the specific working step (I) of the expandable inner wall shaping device,

[0056] The rotary driving mechanism drives the rotary platform to rotate, so that the limit rod abuts against one end of the arc-shaped limit groove;

[0057] Next, the vertical cylinder drives the lower floating plate and the upper floating plate to move downward synchronously until the upper limit block abuts against the upper surface of the rotating platform, so that the synchronous push mechanism drives each slider and the shaping block to move outward synchronously along the corresponding radial guide groove; in this process, the locking rod is first inserted into one of the locking holes; then, the upper floating plate abuts against the lower end plate, and drives the vertical push rod to move downward along the guide through hole, so that the connecting rod drives the corresponding slider and the shaping block to move outward along the radial guide groove, thereby achieving the purpose of shaping the inner circle of the circular product; because the shaping block moves outward along the radial guide groove, in the process of shaping the inner circle of the circular product, the locking rod is inserted into one of the locking holes, so that the shaping block is The locking rod on the floating plate locks the rotation of the vertical push rod, and then locks the rotation of the shaping block and the rotating platform; therefore, even if the operator accidentally controls the rotating platform of the rotating drive mechanism and the shaping block of the expansion shaping device to rotate around the vertical axis rod during this process, the locked shaping block and the rotating platform cannot rotate, thereby effectively solving the problem that during the process of shaping the inner circle of the circular product by the shaping block, the normal operation of the equipment is affected, and even the equipment is damaged and the inner circle of the circular product is scratched by the shaping block, affecting the shaping quality of the inner circle of the circular product.

[0058] Next, the vertical cylinder drives the lower floating plate and the upper floating plate to move upward synchronously until the lower floating plate abuts against the lower end of the vertical guide sleeve. At the same time, the vertical push rod and the lower stop block will move upward under the action of the push rod return spring, thereby driving the corresponding slider and the shaping block to move inward along the radial guide groove through the connecting rod until the lower stop block abuts against the lower end of the vertical shaft rod, so as to realize the synchronous pushing mechanism to drive each slider and the shaping block to move inward along the corresponding radial guide groove synchronously, so as to separate the shaping block from the round product.

[0059] When the lower floating plate abuts against the lower end of the vertical guide sleeve, the locking rod is located above the lower end plate. Therefore, the rotary drive mechanism in step (ii) drives the rotary platform and the shaping blocks on the rotary platform to rotate around the vertical shaft rod without affecting the specific operation of the expandable inner wall shaping device.

[0060] In the specific working step (ii) of the expandable inner wall shaping device, the rotary drive mechanism drives the rotating platform to rotate, so that the limit rod abuts against the other end of the arc-shaped limit groove, so as to drive the rotating platform and each shaping block on the rotating platform to rotate around the vertical shaft to a set angle. Therefore, the self-unlocking push locking mechanism of this embodiment will not affect the normal operation of the expandable inner wall shaping device.

[0061] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any way. Any simple modification, change and equivalent transformation made to the above embodiment based on the technical essence of the present invention still falls within the protection scope of the technical solution of the present invention.

Claims

1. An expansion type inner wall shaping device, characterized in that: include: A frame, comprising a base frame and a working platform arranged on the base frame; The rotating platform is rotatably arranged on the working platform through a vertical shaft, and a guide through hole coaxially arranged therein is arranged in the vertical shaft; The rotary drive mechanism is arranged on the frame and drives the rotary platform to rotate around the vertical shaft; The expansion shaping device comprises a plurality of radial guide grooves arranged on a rotating platform, sliders arranged on the radial guide grooves in a one-to-one correspondence, shaping blocks arranged on the sliders in a one-to-one correspondence, and a synchronous pushing mechanism for driving the sliders to synchronously move along the corresponding radial guide grooves, wherein the radial guide grooves are distributed circumferentially around the vertical shaft, the radial guide grooves are distributed along the radial extension of the vertical shaft, and the side of the shaping block facing away from the vertical shaft is an arc-shaped shaping surface; Synchronous moving mechanism, including: A vertical push rod sliding along the guide through hole is provided with an upper stopper and a lower stopper, wherein the upper stopper is located above the rotating platform and the lower stopper is located below the vertical shaft rod; A connecting rod corresponding to the slider one by one, one end of the connecting rod is hingedly connected to the vertical push rod, and the other end of the connecting rod is hingedly connected to the slider; The self-unlocking sliding locking mechanism includes an arc-shaped limit groove with an opening facing upward arranged on the working platform, a limit rod arranged on the rotating platform and cooperating with the arc-shaped limit groove, a push rod reset spring located between the rotating platform and the upper stop block, a lower end plate arranged at the lower end of the vertical push rod, two locking holes arranged on the upper surface of the lower end plate, a vertical guide sleeve arranged on the base frame, a vertical guide column sliding along the vertical guide sleeve, an upper floating plate located between the lower end plate and the lower stop block, a lower floating plate located below the vertical guide sleeve, and a locking rod arranged on the upper surface of the upper floating plate and cooperating with the locking hole, the limit rod extends into the arc-shaped limit groove, the vertical guide column connects the upper floating plate and the lower floating plate as a whole, and the lower stop block presses against the lower end of the vertical shaft rod under the action of the push rod reset spring.

2. The expandable inner wall shaping device according to claim 1, characterized in that: The synchronous push mechanism also includes a vertical cylinder fixed on the base frame, and a piston rod of the vertical cylinder is connected to the lower floating plate or the upper floating plate; When the lower floating plate abuts against the lower end of the vertical guide sleeve, the locking rod is located above the lower end plate; When the lower floating plate abuts against the lower end of the vertical guide sleeve and the limiting rod abuts against one end of the arc-shaped limiting groove, the locking rod is located just above one of the locking holes; When the lower floating plate abuts against the lower end of the vertical guide sleeve and the limiting rod abuts against the other end of the arc-shaped limiting groove, the locking rod is located just above the other locking hole.

3. An expandable inner wall shaping device according to claim 1 or 2, characterized in that when When the vertical push rod moves upward along the guide through hole, the connecting rod drives the corresponding slider and the shaping block to move inward along the radial guide groove; when the vertical push rod moves downward along the guide through hole, the connecting rod drives the corresponding slider and the shaping block to move outward along the radial guide groove.

4. An expandable inner wall shaping device according to claim 1 or 2, characterized in that: The vertical push rod is also provided with an upper limit block, which is located above the rotating platform.

5. The expandable inner wall shaping device according to claim 1 or 2, characterized in that: The rotary drive mechanism comprises a drive motor arranged on a base frame and a gear transmission mechanism connecting a vertical shaft rod and an output shaft of the drive motor.

6. An expandable inner wall shaping device according to claim 1 or 2, characterized in that: The upper surface of the working platform is provided with a platform groove, the rotating platform is located in the platform groove, and the shaping surface of the shaping block is located above the upper surface of the working platform.

7. The expandable inner wall shaping device according to claim 6, characterized in that: The distance between the lower edge of the shaping surface and the upper surface of the working platform is less than or equal to 1 mm.

8. The expandable inner wall shaping device according to claim 6, characterized in that: The platform groove is circular, the rotating platform is also circular, and the platform groove and the rotating platform are coaxially distributed.

9. The expandable inner wall shaping device according to claim 1 or 2, characterized in that: The radial guide groove is a T-shaped groove or a dovetail groove, and the slider is a T-shaped slider or a dovetail slider correspondingly.

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