Umbrella-shaped inner supporting tool capable of being freely opened and closed

Abstract

An umbrella-shaped inner supporting tool capable of being opened and closed freely comprises a main shaft, a thrust block, a threaded sleeve, four umbrella clack connecting rods and four connecting rods, the threaded sleeve and the thrust block are arranged on the main shaft in a sleeving mode, the threaded sleeve is in threaded fit with the main shaft, and the thrust block is in sliding fit with the main shaft. And the screw sleeve connecting ends of the four umbrella clack connecting rods are uniformly distributed and fixed on the outer circumferential surface of the screw sleeve. One end of each connecting rod is hinged to the corresponding umbrella flap connecting rod, the other end of each connecting rod is hinged to the corresponding thrust rod of the corresponding thrust block, and the umbrella flap connecting rods, the thrust blocks and the connecting rods form a connecting rod mechanism. Due to the fact that the umbrella-shaped device capable of being freely opened and closed is arranged, a thin-wall metal container with a small caliber and a large inner cavity can easily enter an abdominal cavity of the container to be freely opened and closed, and the optimal effect of inner supporting shape correction or inner supporting positioning of outer surface machining is achieved. The adaptability is high. The safety and reliability are high.

Description

Technical Field

[0001] The invention relates to the field of tooling, in particular to a tooling for correcting and rounding or externally processing inner support of a thin-walled metal container with a small caliber and a large inner cavity after overall heat treatment and a method for using the tooling. Background Art

[0002] In the production of military and civilian products, thin-walled metal containers with small diameters and large inner cavities are often encountered. Due to the performance requirements of the product, the product is required to be heat treated as a whole. After heat treatment, the whole needs to be corrected or processed as a whole to ensure the overall cylindricity requirements of the product.

[0003] In order to solve such problems, an umbrella-shaped internal support tooling device that can be opened and closed freely is invented and designed, which is suitable for the overall rounding or external processing of thin-walled metal containers with small diameter and large inner cavity after overall heat treatment.

[0004] In the invention with application number CN201410810573.0, a split-flap adjustable inner support is disclosed. The support comprises two slider bodies and a core mold, wherein the two slider bodies are symmetrically distributed on both sides of the core mold, and are engaged with the core mold plate on the core mold through the sliders on the slider bodies; the two slider bodies are staggered; so that when they move radially, their positions are staggered to avoid interference, and when they finally reach the inner surface of the product, they can be spliced ​​into a split-flap complete outer surface inner support. The support is only applicable to straight-cylindrical shells, and cannot be used for shells with small calibers and large inner cavities.

[0005] In the invention with application number CN201911376952.2, an inner support suitable for the machinery manufacturing industry and used for machining trimming of cylindrical parts is proposed. It is an inner support for machining trimming of cylindrical parts with a wall thickness of no more than 3.0 mm that can be installed on a CNC lathe. It is characterized in that there are two inner supports, which are used in pairs; the inner support comprises a sleeve and a shaft, wherein the sleeve is sleeved on the outer circumferential surface of one end of the shaft. The sleeve is a cylindrical part, which is divided into an elastic section and a rigid section; the inner surface of the rigid section close to the elastic section is a threaded surface that matches the outer surface of the shaft, and the center of the rigid section end plate has a through hole for installing the shaft, and the shaft hole and the shaft are slidably matched; the inner end surface of the rigid section end plate is the stroke limit surface of the shaft; the outer circumferential surface of the sleeve end plate is evenly distributed with two operating blind holes, through which the sleeve is rotated to make it move forward or backward along the shaft. However, this invention needs to be used in pairs when used, and the support of the cylindrical part is achieved by the opening and contraction of the elastic strips. It is also not suitable for shells with small diameter and large inner cavity.

[0006] In the invention with application number CN201610749071.0, an automatic centering inner support is proposed, which can realize automatic rounding of thin-walled cylinders, cylinder segments and shell products during processing and welding. It is characterized by comprising a rotating guide ring, a telescopic centering body, an inner gear ring segment, a worm / gear assembly, a slewing limit block, an axial stopper, a worm, an axle seat and a plurality of telescopic bodies; automatic rounding is achieved through the linkage of the plurality of telescopic bodies. The disadvantage is that the device has a complex structure and high processing requirements. It is only suitable for rounding straight cylindrical container shells, and is also not suitable for rounding shells with small diameters and large inner cavities.

[0007] In the related research results disclosed at home and abroad, the structure and working principle of the inner support have various forms, but the structure and principle of the umbrella-shaped inner support similar to the present invention have not been found. Summary of the invention

[0008] In order to overcome the deficiency that the internal support in the prior art is not suitable for supporting a shell with a small diameter and a large inner cavity, the present invention proposes an umbrella-shaped internal support that can be opened and closed freely.

[0009] The present invention comprises a main shaft, a thrust block, a screw sleeve, four umbrella-shaped connecting rods and four connecting rods. The screw sleeve and the thrust block are respectively mounted on the main shaft, and the screw sleeve and the main shaft are threadedly matched, and the thrust block and the main shaft are slidingly matched. The screw sleeve connecting ends of the four umbrella-shaped connecting rods are evenly distributed and fixed on the outer circumferential surface of the screw sleeve. One end of the four connecting rods is respectively hinged to the umbrella-shaped connecting rod at the position, and the other end is respectively hinged to the thrust rod of the thrust block at the position, so that the umbrella-shaped connecting rod, the thrust block and the connecting rod form a connecting rod mechanism.

[0010] The umbrella petal connecting rod is divided into a support plate and a support rod according to its function. The support plate is a conical sector with a uniform thickness; the rotation radius of the conical sector is adapted to the inner circumference radius of the shell to be supported. The end face of one end of the support rod is fixed to the lower surface of the support plate and is located on the symmetry plane in the width direction of the trapezoidal large end of the support plate; there is an angle α between the support rod and the surface of the support plate; α=48°. The other end of the support rod has a pin hole hinged to the screw sleeve. In the middle of the support rod is a pin hole hinged to the connecting rod.

[0011] The thrust block is divided into a connecting sleeve and four thrust rods according to their functions, and each of the thrust rods is evenly distributed on the outer circumference of the connecting sleeve. Among them, the inner diameter of the connecting sleeve is the same as the outer diameter of the matching main shaft, and the two are slidably matched; the inner surfaces at both ends of the connecting sleeve are provided with mounting surfaces for thrust bearings, and two thrust bearings are installed at both ends of the connecting sleeve, one end of which is positioned by the shaft shoulder, and the other end is positioned by the shaft end retaining ring. One end of each of the thrust rods is fixed on the outer circumferential surface of the connecting sleeve, and the center line of the pin shaft hole at the other end of each thrust rod is vertical to the center line space of the connecting sleeve; the distance between the center of the pin shaft hole of each thrust rod after assembly and the outer circumferential surface of the connecting sleeve is H, and the distance between the center of the pin shaft hole of each thrust rod and the end face of the connecting sleeve at one end is L; H = 13mm, L = 15mm.

[0012] There are four connecting rods, which are used to connect the umbrella petal connecting rod and the thrust rod of the thrust block respectively. The connecting rod is block-shaped, and has U-shaped connecting grooves at both ends, and there are pin holes on the groove walls of the connecting grooves. When in use, each connecting groove is clamped on the connected umbrella petal connecting rod or the thrust rod, and connected through the first pin or the second pin.

[0013] When in use, the link mechanism causes the leaf connecting rod to fold. The screw sleeve is rotated clockwise to shrink the four petals on the petal connecting rod to the periphery until each petal is tangent to the thrust block, reaching the minimum folded diameter φ1 and maintaining a stable state after folding. The folded inner support member is placed into the inner cavity of the product along the small-diameter end of the product, so that the inner support enters the abdominal cavity of the product from the small-diameter end of the product.

[0014] The screw sleeve is rotated counterclockwise to make the screw sleeve move axially along the T-shaped thread on the main shaft. The four lobes on the screw sleeve drive the umbrella-shaped connecting rod to move axially through the second pin shaft. Since the thrust block is fixed to the main shaft by the shaft shoulder and the shaft end retaining ring, the leaf-shaped connecting rod is opened and closed under the action of the connecting rod mechanism during operation. The screw sleeve is rotated counterclockwise to make the umbrella-shaped connecting rods open outward until the umbrella-shaped connecting rods are tangent to the inner wall of the product, reaching the maximum opening and closing diameter of φ2, and remain stable, so that the four lobes of the inner support are evenly fitted with the inner surface of the product, and the circumferential inner support force is evenly distributed, and the outer wall of the product is corrected or processed externally.

[0015] For thin-walled metal containers with small diameter and large inner cavity, after overall heat treatment, the outer surface of the shell will be deformed to varying degrees of convex or concave. In order to correct the shape or form the shape after welding, an internal support must be used to support the deformed thin-walled shell.

[0016] In the present invention, the thrust block passes through the main shaft, one end of which is positioned with a thrust bearing installed inside the thrust block through a shaft shoulder, and the other end is positioned with another thrust bearing installed inside the thrust block through a shaft end retaining ring. When the constraint condition is released, the thrust block can rotate around the main shaft axis. The uniform distribution of the circumferential internal support force is ensured by the four evenly distributed umbrella petals.

[0017] Figures 1 to 6 The diagram is a schematic diagram of the use status of the umbrella petals at the initial and final positions, that is, the two extreme positions of the inner support. Under normal use, rotate the screw sleeve clockwise, and connect the pin shaft and the connecting rod to make the umbrella petals in the contracted and closed state of φ1. After the screw sleeve is displaced S1, it is in the initial position of 0. Put the inner support from the product inlet to the appropriate position where the cylinder needs to be corrected, and then rotate the screw sleeve to the left, and connect the pin shaft and the connecting rod to make the umbrella petals in the maximum φ2 open state. At this time, the arc surface of the four umbrella petals fits tightly with the inner wall of the thin-walled cylinder, locking the screw sleeve. After the radial displacement stroke S2, the screw sleeve is fixed at the end position. The next step of correction or post-welding processing can be carried out.

[0018] The umbrella-shaped inner support proposed in the present invention is suitable for the correction and rounding or external processing of thin-walled metal containers with small diameter and large inner cavity after overall heat treatment. The umbrella-shaped inner support device can be opened and closed freely, and the braking is fast, reliable and safe. It effectively solves the problem of inner support clamping during the correction and rounding or external processing of thin-walled metal containers with small diameter and large inner cavity.

[0019] Compared with the prior art, the present invention has the following advantages and effects: Due to the provision of a freely openable umbrella-shaped device, for thin-walled metal containers with small caliber and large inner cavity, the device can easily enter the abdominal cavity of the container and freely open and close it, achieving the best effect of internal support correction or internal support positioning for processing the outer surface. It has strong adaptability and high safety and reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic diagram of the umbrella petals in the initial position.

[0021] Figure 2 This is a cross-sectional view of the initial position of the umbrella petals closed

[0022] Figure 3 It is the left view of the parachute in the initial position.

[0023] Figure 4 It is a structural schematic diagram of the present invention.

[0024] Figure 5 This is a cross-sectional view of the end position of the umbrella petals opening

[0025] Figure 6 yes Figure 5 Left view of .

[0026] Figure 7It is a schematic diagram of the main axis.

[0027] Figure 8 is a schematic diagram of the thrust block; where Figure 8 a is the side view, Figure 8 b is Figure 8 A front view of Figure 8 c is Figure 8 Sectional view along AA in a.

[0028] Fig. 9 is a schematic diagram of the petal connecting rod; Fig. 9 a is the main view, Fig. 9 b is Fig. 9 Top view of a.

[0029] Fig.10 It is a three-dimensional schematic diagram of the connecting rod.

[0030] Fig.11 Schematic diagram of the first pin.

[0031] Fig.12 Schematic diagram of the second pin shaft.

[0032] Fig.13 is a schematic diagram of the structure of the screw sleeve; wherein, Fig.13 a is the main view, Fig.13 b is Fig.13 Left view of a.

[0033] In the figure: 1. main shaft; 2. thrust block; 3. umbrella petal connecting rod; 4. connecting rod; 5. first pin shaft; 6. second pin shaft; 7. screw sleeve; S1 and S2 are shaped thread segments. DETAILED DESCRIPTION

[0034] The present embodiment is an umbrella-shaped inner support that can be opened and closed freely, comprising a main shaft 1, a thrust block 2, a screw sleeve 7, four umbrella-petal connecting rods 3 and four connecting rods 4; and also comprising a first pin shaft 5 and a second pin shaft 6. Wherein: the screw sleeve 7 and the thrust block 2 are respectively mounted on the main shaft 1, and the screw sleeve and the main shaft are threadedly matched, and the thrust block and the main shaft are slidingly matched. The screw sleeve connecting ends of the four umbrella-petal connecting rods are evenly distributed and fixed on the outer circumferential surface of the screw sleeve. One end of the four connecting rods 4 is respectively hinged to the umbrella-petal connecting rod at the position, and the other end is respectively hinged to the thrust rod of the thrust block at the position, and a connecting rod mechanism is formed by the umbrella-petal connecting rod, the thrust block and the connecting rod. When working, under the action of the connecting rod mechanism, the support plate at the other end of the umbrella-petal connecting rod 3 is fitted with the inner circumferential surface of the shell to be supported to meet the support circle of shells with different inner diameters.

[0035] There are four umbrella petal connecting rods 3. The umbrella petal connecting rods are divided into support plates and support rods according to their functions. The support plate is a conical sector with uniform thickness; the rotation radius of the conical sector is adapted to the inner circumference radius of the shell to be supported. The end face of one end of the support rod is fixed to the lower surface of the support plate and is located on the symmetry plane in the width direction of the trapezoidal large end of the support plate; there is an angle α between the support rod and the surface of the support plate; α=48°. The other end of the support rod has a pin hole hinged to the screw sleeve 7. In the middle of the support rod is a pin hole hinged to the connecting rod 4.

[0036] The thrust block 2 is a hollow rotating body. The thrust block is divided into a connecting sleeve and four thrust rods according to their functions, and each of the thrust rods is evenly distributed on the outer circumference of the connecting sleeve. Among them, the inner diameter of the connecting sleeve is the same as the outer diameter of the matching main shaft, and the two are slidably matched; the inner surfaces of the two ends of the connecting sleeve are respectively provided with mounting surfaces of thrust bearings, and two thrust bearings are installed at the two ends of the connecting sleeve, one end of which is positioned by the shoulder of the shaft 1, and the other end is positioned by the shaft end retaining ring. One end of each of the thrust rods is fixed on the outer circumferential surface of the connecting sleeve, and the center line of the pin shaft hole at the other end of each thrust rod is vertical to the center line space of the connecting sleeve; the distance between the center of the pin shaft hole of each thrust rod after assembly and the outer circumferential surface of the connecting sleeve is H, and the distance between the center of the pin shaft hole of each thrust rod and the end face of the connecting sleeve at one end is L; H = 13mm, L = 15mm.

[0037] There are four connecting rods 4, which are used to connect the umbrella petal connecting rod and the thrust rod of the thrust block. The connecting rod is block-shaped, and has U-shaped connecting grooves at both ends, and there are pin holes on the groove walls of the connecting grooves. When in use, each connecting groove is clamped on the connected umbrella petal connecting rod or the thrust rod, and connected through the first pin 5 or the second pin 6.

[0038] The threaded sleeve 7 is in the shape of a sleeve, and its inner circumferential surface is a threaded surface that matches the main shaft 1 .

[0039] Before use, the main shaft 1 is first fixed by an external device, and the screw sleeve 7 is rotated clockwise to make the screw sleeve move axially along the T-shaped thread on the main shaft 1. The four lobes on the screw sleeve drive the umbrella-shaped connecting rod 3 to move axially through the second pin shaft 6. Since the umbrella-shaped connecting rod 3 is hinged with the upper end of the connecting rod 4 through the first pin shaft 5, and the lower end of the connecting rod 4 is connected with the four lobes on the thrust block 2 through the first pin shaft 5, the umbrella-shaped connecting rod 3, the thrust block 2 and the connecting rod 4 form a connecting rod mechanism. Since the thrust block 2 is fixed to the main shaft 1 by the shaft shoulder and the shaft end retaining ring, when working, under the action of the connecting rod mechanism, the leaf-shaped connecting rod 3 will be forced to move in a folding motion. The movement result after the screw sleeve 7 is rotated clockwise is that the outer periphery of the four umbrella-shaped connecting rods 3 shrinks until the umbrella-shaped connecting rods are tangent to the thrust block, reaching the minimum folding diameter φ1. Since the T-shaped threads have a self-locking function, the component umbrella-shaped connecting rods will remain stable and motionless at the minimum folding diameter φ1.

[0040] When the umbrella petals are in the smallest closed state, the closed inner support member is placed into the inner cavity of the product along the small diameter of the front end of the product, so that the inner support member can enter the abdominal cavity of the product from the small diameter.

[0041] When in use, the screw sleeve 7 is rotated counterclockwise to make the screw sleeve 7 move axially along the T-shaped thread on the main shaft 1, and the four lobes on the screw sleeve drive the umbrella-shaped connecting rod 3 to move axially through the second pin shaft 6. Since the umbrella-shaped connecting rod 3 is hinged to the upper end of the connecting rod 4 through the first pin shaft 5, and the lower end of the connecting rod 4 is connected to the four lobes on the thrust block 2 through the first pin shaft 5, the umbrella-shaped connecting rod 3, the thrust block 2 and the connecting rod 4 form a connecting rod mechanism. Since the thrust block 2 is fixed to the main shaft 1 by the shaft shoulder and the shaft end retaining ring, when working, under the action of the connecting rod mechanism, the leaf-shaped connecting rod 3 will be forced to open and close. The movement result produced by rotating the screw sleeve 7 counterclockwise to the left is: the outer periphery of the four umbrella-shaped connecting rods 3 is opened, and the umbrella-shaped connecting rods are opened and closed until the umbrella-shaped connecting rods are tangent to the inner wall of the product, and the maximum opening and closing diameter φ2 is reached at this time. Since the T-shaped threads have a self-locking function, the component umbrella-shaped connecting rods remain stable and motionless at the maximum opening and closing diameter φ2 at this moment. At this point, the four lobes of the inner support are evenly fitted to the inner wall of the product, and the circumferential inner support force is evenly distributed, so the outer wall of the product can be corrected or externally processed.

[0042] After the orthopedic treatment or external processing is completed, the inner support is reduced and restored to its original position according to the above principle, and then taken out from the inner cavity of the product. In this way, the umbrella-shaped inner support orthopedic device can well play the function of free opening and closing and uniform internal support, and plays an irreplaceable role in the overall rounding or external processing of thin-walled metal containers with small diameter and large inner cavity after overall heat treatment.

[0043] The present invention relates to an umbrella-shaped internal support device that can be opened and closed freely, and is specifically used for the correction and rounding of thin-walled metal containers with small diameter and large inner cavity after overall heat treatment or external processing of internal support tooling. It is applicable to thin-walled metal containers with small diameter and large inner cavity.

Claims

1. An umbrella-shaped inner support capable of being opened and closed freely, characterized in that: The invention comprises a main shaft (1), a thrust block (2), a screw sleeve (7), four umbrella-shaped connecting rods (3) and four connecting rods (4); and also comprises a first pin shaft (5) and a second pin shaft (6); wherein: the screw sleeve and the thrust block (2) are respectively sleeved on the main shaft (1), and the screw sleeve and the main shaft are threadedly matched, and the thrust block and the main shaft are slidingly matched; the screw sleeve connecting ends of the four umbrella-shaped connecting rods are evenly distributed and fixed on the outer circumferential surface of the screw sleeve; one end of the four connecting rods is respectively hinged to the umbrella-shaped connecting rod at the position, and the other end is respectively hinged to the thrust rod of the thrust block at the position, and the umbrella-shaped connecting rod, the thrust block and the connecting rod form a connecting rod mechanism.

2. The umbrella-shaped inner support capable of being freely opened and closed as claimed in claim 1, characterized in that: There are four umbrella petal connecting rods (3); the umbrella petal connecting rods are divided into a support plate and a support rod according to their functions; the support plate is a conical sector with a uniform thickness; the rotation radius of the conical sector is adapted to the inner circumference radius of the shell to be supported; the end face of one end of the support rod is fixed to the lower surface of the support plate and is located on the symmetry plane in the width direction of the trapezoidal large end of the support plate; there is an angle α between the support rod and the surface of the support plate; α=48°; the other end of the support rod is provided with a pin shaft hole hinged to the screw sleeve (7); and the middle part of the support rod is provided with a pin shaft hole hinged to the connecting rod (4).

3. The umbrella-shaped inner support capable of being freely opened and closed as claimed in claim 1, characterized in that: The thrust block (2) is divided into a connecting sleeve and four thrust rods according to their functions, and each of the thrust rods is evenly distributed on the outer circumference of the connecting sleeve; wherein the inner diameter of the connecting sleeve is the same as the outer diameter of the mating main shaft, and the two are slidably matched; the inner surfaces at both ends of the connecting sleeve are respectively provided with mounting surfaces for thrust bearings, and two thrust bearings are separately installed at both ends of the connecting sleeve, one end of which is positioned by the shaft shoulder of the shaft (1), and the other end is positioned by the shaft end retaining ring; one end of each of the thrust rods is fixed to the outer circumferential surface of the connecting sleeve, and the center line of the pin shaft hole at the other end of each thrust rod is vertical to the center line space of the connecting sleeve; after assembly, the distance between the center of the pin shaft hole of each thrust rod and the outer circumferential surface of the connecting sleeve is H, and the distance between the center of the pin shaft hole of each thrust rod and the end face of the connecting sleeve at one end is L; H=13mm, L=15mm.

4. The umbrella-shaped inner support capable of being freely opened and closed as claimed in claim 1, characterized in that: There are four connecting rods (4), which are respectively used to connect the umbrella petal connecting rod and the thrust rod of the thrust block. The connecting rod is block-shaped, and has U-shaped connecting grooves at both ends. There are pin holes on the groove walls of the connecting grooves. When in use, each connecting groove is clamped on the connected umbrella petal connecting rod or the thrust rod, and connected through the first pin (5) or the second pin (6).

5. The umbrella-shaped inner support capable of being freely opened and closed as claimed in claim 1, characterized in that: When in use, under the action of the connecting rod mechanism, the leaf connecting rod (3) is made to retract; the screw sleeve (7) is rotated clockwise to make the four umbrella petals on the umbrella petal connecting rod (3) retract toward the periphery until each umbrella petal is tangent to the thrust block, reaching the minimum retracted diameter φ1, and maintaining a stable state after folding; the folded inner support member is placed into the inner cavity of the product along the small-diameter end of the product, so that the inner support enters the abdominal cavity of the product from the small-diameter end of the product.

6. The umbrella-shaped inner support capable of being freely opened and closed as claimed in claim 1, characterized in that: The screw sleeve (7) is rotated counterclockwise to make the screw sleeve move axially along the T-shaped thread on the main shaft (1). The four lobes on the screw sleeve drive the umbrella-shaped connecting rod (3) to move axially through the second pin shaft (6). Since the thrust block (2) is fixed to the main shaft by the shaft shoulder and the shaft end retaining ring, when working, the leaf-shaped connecting rod is opened and closed under the action of the connecting rod mechanism; the screw sleeve is rotated counterclockwise to make the umbrella-shaped connecting rods open outward and open and close until the umbrella-shaped connecting rods are tangent to the inner wall of the product and reach the maximum opening and closing diameter φ2, and remain stable and motionless, so that the four lobes of the inner support are evenly fitted with the inner surface of the product, the circumferential inner support force is evenly distributed, and the outer wall of the product is corrected or processed externally.

Images