A fixture suitable for machining thin-walled cylinders

Abstract

The application belongs to the technical field of cylinder processing, and particularly relates to a clamp suitable for thin-wall cylinder processing, which comprises a base, the top end of the base is fixedly connected with a sleeve, the inside of the sleeve is provided with a cavity, the inner ring wall of the sleeve is connected with an elastic film, the elastic film is filled with shaped particles between the elastic film and the cavity, a cylinder workpiece passes through the inner ring of the elastic film and is placed on the base, and the sleeve is connected with an air pump; the sleeve, the elastic film and the shaped particles are arranged to form a clamping sleeve ring with elastic deformation capacity, the cylinder ring side can be comprehensively wrapped, negative pressure is generated by suction on the cavity in the sleeve, the shaped particles no longer flow, and the sleeve ring is shaped, the stability of clamping the cylinder is improved, the stress on the cylinder ring side is uniform, the problem that the thin-wall cylinder is prone to deformation due to uneven stress when the traditional clamping device is used is solved, and in addition, the elastic function can adjust the clamping range and has better adaptability.

Description

Technical Field

[0001] This invention belongs to the field of cylinder machining, specifically a fixture suitable for machining thin-walled cylinders. Background Technology

[0002] When machining a thin-walled cylinder, it is necessary to clamp the cylinder and ensure its roundness. Conventional clamping methods often use double-sided clamping or three-jaw chucks. In these clamping methods, the clamp and the cylinder are subjected to forces at multiple points, which can easily lead to deformation of the thin-walled cylinder.

[0003] A patent application with publication number CN116408734A discloses an automatic fixture for ultrasonic straightening of thin-walled cylindrical workpieces. It mainly includes an active internal six-jaw chuck and a passive internal six-jaw chuck. Both ends of the thin-walled cylinder are fixed by the chucks. The distance between the passive internal six-jaw chuck and the active internal six-jaw chuck is adjusted by a second driving component. It has high clamping rigidity, which can greatly reduce the deformation generated during processing, and the clamping space can be flexibly adjusted.

[0004] The above technical solution also has some problems. Although it can adjust the clamping range, the clamping method used is still the traditional jaw chuck method. The force on the cylinder is concentrated on the jaws of the six-jaw chuck, which cannot fully wrap around the cylinder. There is a force deviation at the boundary between the part of the cylinder that is in contact with the jaws and the part that is not in contact with the jaws. The force on the cylinder is uneven. During the processing, the thin-walled cylinder may have a tendency to move when subjected to the force of the processing tool. In order not to affect the stress of the product, it is necessary to ensure that the force on the cylindrical surface is uniform as much as possible during processing. However, the above solution has a force deviation, which can easily cause the cylinder to deform during processing, and the effect is not ideal.

[0005] Therefore, the present invention provides a fixture suitable for machining thin-walled cylinders. Summary of the Invention

[0006] In order to overcome the shortcomings of the prior art, at least one technical problem raised in the background art is solved.

[0007] The technical solution adopted by the present invention to solve its technical problem is as follows: The present invention provides a fixture suitable for machining thin-walled cylinders, including a base, a sleeve fixedly connected to the top of the base, a cavity provided inside the sleeve, an elastic membrane connected to the inner ring wall of the sleeve, and shaped particles filled between the elastic membrane and the cavity. A cylindrical workpiece passes through the inner ring of the elastic membrane and is placed on the base, and an air pump is connected to the outside of the sleeve.

[0008] Preferably, one side of the longitudinal section of the sleeve is U-shaped, and the elastic membrane protrudes towards the center of the sleeve.

[0009] Preferably, it further includes an adjustment mechanism, which includes: a plurality of slide blocks slidably mounted on the top end of the sleeve, the slide blocks being evenly distributed in a ring; and a dial plate movably inserted inside the slide blocks, the dial plate being ┐-shaped, the dial plate being used to push the elastic membrane away from the cylinder.

[0010] Preferably, the adjustment mechanism further includes: a rotating ring rotatably mounted on the top end of the sleeve; a plurality of first and second inclined plates fixed to the top end of the rotating ring, wherein after the rotating ring rotates, it pushes the slide block upward through the first inclined plate and pushes the dial plate inward through the second inclined plate; and a push spring for pushing the dial plate outward.

[0011] Preferably, the second ramp is located at the top of the first ramp, and the top surface of the second ramp is flush with the top surface of the first ramp.

[0012] Preferably, it further includes a picking and placing mechanism, which includes: a plurality of storage chambers fixed to the top end of the sleeve, the bottom end of the storage chambers being connected to the sleeve through a material inlet; and a shovel disposed inside the storage chamber, the shovel being used to drive the shaped particles to transfer between the sleeve and the storage chambers.

[0013] Preferably, the shovel component includes: a lifting plate slidably installed inside the storage chamber; a deformable plate disposed at the bottom of the lifting plate; and two baffles fixed to the bottom end of the lifting plate and respectively located on both sides of the deformable plate, wherein the bottom end of the deformable plate, after being bent, forms a bucket structure with the baffles.

[0014] Preferably, the picking and placing mechanism further includes: a plurality of top plates fixed inside the sleeve, wherein after the deformable plate moves down into the sleeve, the bottom end of the deformable plate is bent by the top plates; and a smoothing plate fixed inside the storage chamber, wherein after the deformable plate moves up into the storage chamber, the bottom end of the deformable plate is smoothed by the smoothing plate.

[0015] Preferably, the picking and placing mechanism further includes: a plurality of third ramp plates fixed to the rotating ring, which push the lifting plate upward after the rotating ring rotates; and a downward pressure spring for pushing the lifting plate downward.

[0016] Preferably, the loading and unloading mechanism further includes a valve for controlling the opening and closing of the material inlet.

[0017] The beneficial effects of this invention are as follows:

[0018] 1. The present invention provides a clamp suitable for machining thin-walled cylinders. By incorporating a sleeve, an elastic membrane, and shaping particles, a clamping ring with elastic deformation capability is formed. This ring can completely enclose the cylinder's ring sides. By drawing suction into the cavity within the sleeve to generate negative pressure, the shaping particles cease to flow, thus fixing the ring's shape. This not only improves the stability of clamping the cylinder but also ensures uniform force distribution on the cylinder's ring sides. Once the negative pressure in the cavity is released, the shaping particles become loose and flowable, allowing the cylinder to be easily removed. This clamp is convenient to use. This clamp improves upon traditional clamping devices, which are prone to deformation of thin-walled cylinders due to uneven force distribution. Furthermore, the elastic function allows for adjustment of the clamping range, resulting in better adaptability.

[0019] 2. The fixture for processing thin-walled cylinders described in this invention, by setting up a prying plate and a picking and placing mechanism, allows the shovel to transfer some of the shaped particles in the cavity to the storage chamber before the cylinder is placed in and taken out. This reduces the amount of shaped particles in the cavity, making the elastic membrane more easily deformable and able to move a greater distance outward. This improves the ease of picking and placing the cylinder and avoids the problem of the picking and placing speed being hindered or the cylinder deforming due to the pressure of the elastic membrane and shaped particles during the picking and placing process. The result is a better performance.

[0020] 3. The fixture for processing thin-walled cylinders described in this invention, by setting a first inclined plate, a second inclined plate, and a third inclined plate on the rotating ring, and setting a smoothing plate and a top plate in the storage chamber and the sleeve respectively, and cooperating with the shovel and the material scraper, realizes the function of driving the movement of the shovel and the material scraper to transfer the shaped particles back and forth by controlling the rotation of a single rotating ring. It can work in cycles without the need for additional electric drive systems, and has a simple structure and is easy to use. Attached Figure Description

[0021] The invention will now be further described with reference to the accompanying drawings.

[0022] Figure 1 This is a perspective view of Embodiment 1 of the present invention;

[0023] Figure 2 This is a half-sectional view of the present invention;

[0024] Figure 3 This is an exploded view of the sleeve, elastic diaphragm, and adjustment mechanism;

[0025] Figure 4 yes Figure 2 Enlarged view of a portion of point A in the middle;

[0026] Figure 5 It is a 3D diagram of the combination of a rotating ring, a single set of levers, and an elastic diaphragm.

[0027] Figure 6This is an exploded view of the rotating ring, single-set lever, and shovel components;

[0028] Figure 7 This is a schematic diagram illustrating the changes in the state of an elastic membrane;

[0029] Figure 8 This is a schematic diagram showing the changes in the state of the shovel component. Detailed Implementation

[0030] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments. Example 1

[0031] like Figure 1-2 As shown in the embodiment of the present invention, a fixture suitable for machining thin-walled cylinders includes a base 1, a sleeve 2 fixedly connected to the top end of the base 1, a cavity inside the sleeve 2, an elastic membrane 3 connected to the inner ring wall of the sleeve 2, and shaped particles 4 filling the space between the elastic membrane 3 and the cavity. The cylindrical workpiece passes through the inner ring of the elastic membrane 3 and is placed on the base 1. An air pump 5 is connected to the sleeve 2.

[0032] Specifically, the elastic membrane 3 is made of an elastic material with deformation and recovery capabilities, and the shaping particles 4 are powder particles that can be shaped after being subjected to negative pressure. In the initial state, the shaping particles 4 are in a loose state that can flow within the cavity, thereby allowing the elastic membrane 3 to deform so that the cylinder can move between the inner rings of the elastic membrane 3. When clamping and fixing the thin-walled cylinder, the cylinder is inserted into the inner ring of the elastic membrane 3 from top to bottom. The cylinder passes through the elastic membrane 3 and is placed on the base 1. At this time, the elastic membrane 3 wraps around the ring side of the cylinder. Since the shaping particles 4 can flow, the elastic membrane 3 can be evenly attached to the ring side of the cylinder. Then, the air pump is started. 5. The cavity is suctioned to create a negative pressure inside. The shaping particles 4 stop flowing and remain shaped under the negative pressure. At this time, the elastic membrane 3 becomes a fixed ring shape, which can clamp and fix the cylinder. Moreover, the clamping force of the elastic membrane 3 on the cylinder is evenly distributed along the ring side of the cylinder, and the cylinder is subjected to more uniform force. In this scheme, the sleeve 2, the elastic membrane 3 and the shaping particles 4 form a clamping ring with elastic deformation capability, which can fully wrap the ring side of the cylinder. During the clamping process, the cylinder is subjected to uniform force, which improves the problem that thin-walled cylinders are prone to deformation due to uneven force when using traditional clamping devices.

[0033] like Figure 2 As shown, one side of the longitudinal section of the sleeve 2 is shaped like an inverted triangle, and the elastic membrane 3 protrudes towards the center of the sleeve 2.

[0034] Specifically, the elastic membrane 3 protrudes inward, and the cylinder only contacts the elastic membrane 3 when it is inserted into the inner ring of the sleeve 2.

[0035] like Figure 1-6 As shown, it also includes an adjustment mechanism 6, which includes: a plurality of slide blocks 61 slidably mounted on the top end of the sleeve 2, the slide blocks 61 being evenly distributed in a ring; and a dial plate 62 movably inserted into the slide blocks 61, the dial plate 62 being ┐-shaped, the dial plate 62 being used to push the elastic membrane 3 away from the cylinder.

[0036] Specifically, in this device, the movement direction of each structure away from the center of the sleeve 2 is outward, and vice versa; the lever 62 can move up and down with the slide 61, and can also move inward and outward inside the slide 61. In the initial state, the lever 62 abuts against the inner ring of the elastic membrane 3 and pushes the elastic membrane 3 to move outward, thereby expanding the range of the inner ring of the elastic membrane 3, which allows the cylinder to pass through the inner ring of the elastic membrane 3 more smoothly, and helps to place the cylinder on the base 1.

[0037] like Figure 2-6 As shown, the adjustment mechanism 6 further includes: a rotating ring 63 rotatably mounted on the top end of the sleeve 2; a plurality of first ramp plates 64 and second ramp plates 65 fixed to the top end of the rotating ring 63, wherein after the rotating ring 63 rotates, it pushes the slide block 61 upward through the first ramp plate 64 and pushes the dial plate 62 inward through the second ramp plate 65; and a push spring 66 for pushing the dial plate 62 outward.

[0038] Specifically, in the initial state, the lever 62 moves outward under the action of the push spring 66, pushing the elastic membrane 3 outward. At this time, the lever 62 compresses the shaping particles 4 in the cavity, and the shaping particles 4 in the cavity tend to flow inward. After the cylinder is placed on the base 1, the rotating ring 63 is started to rotate. After the rotating ring 63 rotates, it pushes the slide 61 and the lever 62 upward through the first inclined plate 64, so that the lever 62 and the elastic membrane 3 are separated vertically. Subsequently, the elastic membrane 3 tightly wraps the cylinder under the push of the shaping particles 4. When it is necessary to release the cylinder, the air pump 5 is started to release the negative pressure in the cavity, so that the shaping particles 4 become flowable. Then the cylinder can be pulled out from the inner ring of the elastic membrane 3. The rotating ring 63 is started to rotate. After rotation, the second ramp plate 65 pushes the lever 62 inward to the inner ring of the elastic membrane 3. During this process, the slide 61 is always located at the top of the first ramp plate 64, and the lever 62 is located above the elastic membrane 3. After the rotating ring 63 continues to rotate, the first ramp plate 64 separates from the slide 61. The slide 61 and the lever 62 move downward under their own weight. The lever 62 moves down to be aligned with the elastic membrane 3 and located in the inner ring of the elastic membrane 3. Of course, a spring can also be set on the slide 61 to further push the slide 61 downward. After the rotating ring 63 continues to rotate, the second ramp plate 65 separates from the lever 62. The lever 62 moves outward to reset under the action of the pushing spring 66, and pushes the elastic membrane 3 outward. In this way, the function of automatically expanding and resetting the inner ring range of the elastic membrane 3 is realized.

[0039] like Figure 2-6 As shown, the second ramp plate 65 is located at the top of the first ramp plate 64, and the top surface of the second ramp plate 65 is flush with the top surface of the first ramp plate 64.

[0040] Specifically, the top surfaces of the first ramp plate 64 and the second ramp plate 65 are flush, and the lever plate 62 is always at the top during the process of moving from the outside to the inside, which avoids the problem of the lever plate 62 touching the elastic membrane 3 and affecting the inward movement process, thus ensuring the smoothness of the inward movement process of the lever plate 62.

[0041] like Figure 2-8 As shown, it also includes a picking and placing mechanism 7, which includes: a plurality of storage chambers 71 fixed to the top of the sleeve 2, the bottom end of the storage chamber 71 being connected to the sleeve 2 through a material inlet 72; and a shovel 73 disposed inside the storage chamber 71, the shovel 73 being used to drive the shaped particles 4 to transfer between the sleeve 2 and the storage chamber 71.

[0042] Specifically, since the shaped particles 4 fill the cavity, the fixed volume of the shaped particles 4 within the fixed range may hinder the outward movement of the elastic membrane 3, and the cylinder may also deform due to compression during loading and unloading. To address this, a loading and unloading mechanism 7 is provided. Before the lever plate 62 pushes the elastic membrane 3 outward, the shovel 73 is activated to extend into the cavity, shovel up some of the shaped particles 4 in the cavity and send them to the storage chamber 71. The amount of shaped particles 4 in the cavity is reduced, which helps the elastic membrane 3 to move outward and can extend the outward movement stroke of the elastic membrane 3, thereby further expanding the inner circle range of the elastic membrane 3, making it suitable for clamping cylinders of more sizes.

[0043] like Figure 4-8 As shown, the shovel component 73 includes: a lifting plate 731 slidably installed inside the storage chamber 71; a deformable plate 732 disposed at the bottom of the lifting plate 731; and two baffles 733 fixed to the bottom end of the lifting plate 731 and respectively located on both sides of the deformable plate 732. After the bottom end of the deformable plate 732 is bent, it forms a bucket structure with the baffles 733.

[0044] Specifically, the deformable plate 732 is made of spring steel, preferably but not limited to manganese steel sheet. When the bottom end of the deformable plate 732 is subjected to external force, it will switch between two states: straight and bent. After the deformable plate 732 is inserted into the cavity in a straight state, the bottom end of the deformable plate 732 is bent. The bent deformable plate 732 and the baffle 733 form a bucket, which can dig out the shaped particles 4 in the cavity. Then the deformable plate 732 moves upward to transfer the shaped particles 4 into the storage chamber 71. After the bottom end of the deformable plate 732 is straightened, the shaped particles 4 that were originally dug out can fall downward into the cavity. In this way, the function of transferring the shaped particles 4 between the cavity and the storage chamber 71 by the shovel 73 is realized.

[0045] like Figure 4-8 As shown, the picking and placing mechanism 7 further includes: a plurality of top plates 74 fixed inside the sleeve 2, after the deformable plate 732 moves down into the sleeve 2, the bottom end of the deformable plate 732 is pushed to bend by the top plates 74; and a smoothing plate 75 fixed inside the storage chamber 71, after the deformable plate 732 moves up into the storage chamber 71, the bottom end of the deformable plate 732 is smoothed by the smoothing plate 75.

[0046] Specifically, the top plate 74 is provided with an inclined surface. After the flat deformable plate 732 moves down, it contacts the inclined surface of the top plate 74. The bottom end of the deformable plate 732 is squeezed and bent to form a bucket. Compared with the fixed bucket structure, the deformable plate 732 is easier to insert into the shaped particles 4 when it is flat. After the bent deformable plate 732 moves up into the storage chamber 71, it contacts the straightening plate 75. The straightening plate 75 straightens the bottom end of the deformable plate 732, realizing the function of automatically deforming the deformable plate 732 and transferring the shaped particles 4 during the up and down process. The structure is simple and easy to use.

[0047] like Figure 3-6 As shown, the pick-and-place mechanism 7 further includes: a plurality of third ramp plates 76 fixed to the rotating ring 63, which push the lifting plate 731 upward through the third ramp plates 76 after the rotating ring 63 rotates; and a downward pressure spring 77 for pushing the lifting plate 731 downward.

[0048] Specifically, the rotating ring 63 is started to rotate. After the rotating ring 63 rotates, the lifting plate 731 is moved upward through the third inclined plate 76, which in turn moves the shovel 73 upward. The rotating ring 63 continues to rotate. After the third inclined plate 76 separates from the lifting plate 731, the downward spring 77 pushes the lifting plate 731 downward, which in turn moves the shovel 73 into the cavity. This device can drive the lever plate 62 and the shovel 73 to move by controlling the rotation of a single rotating ring 63. There is no need to set up multiple sets of electric drive systems. The structure is simple and easy to use. Example 2

[0049] like Figure 3-4 As shown in the comparative embodiment one, another embodiment of the present invention is as follows: the picking and placing mechanism 7 further includes a valve 78 for controlling the opening and closing of the material inlet 72.

[0050] Specifically, the opening and closing of the feed inlet 72 is controlled by the valve component 78. When clamping the cylinder, the valve component 78 is activated to close the feed inlet 72, making the cavity a sealed cavity, which helps to generate negative pressure in the cavity. After the valve component 78 is activated to open the feed inlet 72, the cavity is connected to the storage chamber 71, and the transfer of the shaped particles 4 can be carried out.

[0051] Working principle: In the initial state, the third inclined plate 76 drives the lifting plate 731 and the shovel 73 to move upward. The shovel 73 is located in the storage chamber 71, the deformation plate 732 is in a flat state, the material outlet 72 is closed, and the storage chamber 71 contains some shaped particles 4. The push plate 62 is located at the outer end of the bottom of its movement range, and the inner ring of the elastic membrane 3 is in an expanded state.

[0052] When clamping and fixing the thin-walled cylinder, the cylinder is inserted into the inner ring of the elastic membrane 3 from top to bottom. The cylinder passes through the elastic membrane 3 and is placed on the base 1. After the cylinder is placed, the feed port 72 is opened and then closed again, so that the shaped particles in the storage chamber 71 fall into the cavity. The rotating ring 63 is started to rotate. After the rotating ring 63 rotates, the slide 61 and the push plate 62 are pushed upward by the first inclined plate 64, so that the push plate 62 is separated from the elastic membrane 3. Then, the elastic membrane 3 tightly wraps the cylinder under the push of the shaped particles 4. The air pump 5 is started to suck the cavity, so that a negative pressure is formed inside the cavity. The shaped particles 4 no longer flow under the negative pressure environment and remain shaped. At this time, the elastic membrane 3 becomes a fixed ring shape, which can clamp and fix the cylinder.

[0053] When removing the cylinder, the air pump 5 is activated to release the negative pressure in the cavity, causing the shaped particles 4 to become a loose, flowable state. The feed inlet 72 is opened, and the rotating ring 63 is started to rotate. After the rotating ring 63 rotates, the third inclined plate 76 separates from the lifting plate 731. The downward spring 77 pushes the lifting plate 731 downward, thereby driving the shovel 73 to insert into the cavity.

[0054] After the deformable plate 732 is inserted into the cavity in a straight state, it contacts the inclined surface of the top plate 74. The bottom end of the deformable plate 732 is squeezed and bent to form a bucket.

[0055] As the rotating ring 63 continues to rotate, the next third inclined plate 76 contacts the lifting plate 731 and drives the lifting plate 731 and the shovel 73 to move upward into the storage chamber 71. The bucket-shaped shovel 73 transfers the shaped particles 4 in the cavity to the storage chamber 71. The amount of shaped particles 4 in the cavity decreases, and the elastic membrane 3 is easier to deform. At this time, the cylinder can be pulled out from the inner ring of the elastic membrane 3.

[0056] The rotating ring 63 continues to rotate, pushing the lever 62 inward to the inner ring of the elastic membrane 3 via the second ramp plate 65. During this process, the slide 61 remains at the top of the first ramp plate 64, and the lever 62 is positioned above the elastic membrane 3. Then, the first ramp plate 64 separates from the slide 61, and the slide 61 and lever 62 move downward under their own weight, with the lever 62 moving down to align with the elastic membrane 3 and be located within its inner ring. Next, the second ramp plate 65 and lever 62... Separately, the lever 62 moves outward and resets under the action of the push spring 66, and pushes the elastic membrane 3 outward, expanding the inner ring of the elastic membrane 3; during this process, the feed port 72 is closed, the shovel 73 moves up to contact the straightening plate 75, the straightening plate 75 straightens the bottom end of the deformed plate 732, and the shaped particles 4 shoveled away by the shovel 73 are stored in the storage chamber 71. The whole device completes the reset work and can continue to carry out the next round of cylindrical clamping and removal work to realize the cycle work.

[0057] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A fixture suitable for machining of thin-walled cylinders, comprising a base (1), characterised in that: The top end of the base (1) is fixedly connected with a sleeve (2), the inside of the sleeve (2) is provided with a cavity, the inner ring wall of the sleeve (2) is connected with an elastic film (3), the elastic film (3) is filled with shaped particles (4) between the cavity, the cylindrical workpiece passes through the inner ring of the elastic film (3) and is placed on the base (1), the sleeve (2) is connected with an air pump (5); The single side of the longitudinal section of the sleeve (2) is in the shape of a Chinese character, the elastic film (3) is convex to the direction close to the center of the sleeve (2); Further comprising an adjusting mechanism (6), the adjusting mechanism (6) comprises: A plurality of sliding seats (61) slidingly installed at the top end of the sleeve (2), the sliding seats (61) are annularly and uniformly distributed; A push plate (62) movably inserted into the sliding seat (61), the push plate (62) is in the shape of ┐, and the push plate (62) is used for pushing the elastic film (3) away from the cylinder; The adjusting mechanism (6) further comprises: A rotating ring (63) rotatably installed at the top end of the sleeve (2); A first inclined plate (64) and a second inclined plate (65) fixedly connected at the top end of the rotating ring (63), after the rotating ring (63) rotates, the first inclined plate (64) pushes the sliding seat (61) to move upward, and the second inclined plate (65) pushes the push plate (62) to move inward; A pushing spring (66) for pushing the push plate (62) to move outward; The shaped particles (4) no longer flow and keep shaping under the negative pressure environment.

2. The fixture of claim 1, wherein: The second inclined plate (65) is located at the top end of the first inclined plate (64), and the top end surface of the second inclined plate (65) is flush with the top end surface of the first inclined plate (64).

3. A fixture suitable for machining thin-walled cylinders according to claim 2, characterized in that: Further comprising a taking and placing mechanism (7), the taking and placing mechanism (7) comprises: A plurality of storage chambers (71) fixedly connected at the top end of the sleeve (2), the bottom end of the storage chamber (71) is communicated with the sleeve (2) through a material opening (72); A material shoveling piece (73) arranged in the storage chamber (71), the material shoveling piece (73) is used for transferring the shaped particles (4) between the sleeve (2) and the storage chamber (71).

4. The fixture of claim 3, wherein: The material shoveling piece (73) comprises: A lifting plate (731) slidingly installed in the storage chamber (71); A deformation plate (732) arranged at the bottom of the lifting plate (731); Two baffle plates (733) fixedly connected at the bottom end of the lifting plate (731) and respectively located at the two sides of the deformation plate (732), and the bottom end of the deformation plate (732) is bent to form a bucket structure with the baffle plates (733).

5. A fixture suitable for machining thin-walled cylinders according to claim 4, characterized in that: The taking and placing mechanism (7) further comprises: A top plate (74) fixedly connected in the sleeve (2), after the deformation plate (732) moves downward to the inside of the sleeve (2), the bottom end of the deformation plate (732) is bent by the top plate (74); A flattening plate (75) fixedly connected in the storage chamber (71), after the deformation plate (732) moves upward to the inside of the storage chamber (71), the bottom end of the deformation plate (732) is flattened by the flattening plate (75).

6. A fixture suitable for machining thin-walled cylinders according to claim 5, characterized in that: The taking and placing mechanism (7) further comprises: A third ramp plate (76) is fixed to the rotating ring (63), and the rotating ring (63) pushes the lifting plate (731) upward through the third ramp plate (76) after rotating; A downward spring (77) is used to push the lifting plate (731) downward.

7. A fixture suitable for machining thin-walled cylinders according to claim 6, characterized in that: The pick-and-place mechanism (7) further comprises a valve piece (78) for controlling the opening and closing of the material port (72).

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