CN218453189U - Diameter-variable telescopic die - Google Patents
Diameter-variable telescopic die Download PDFInfo
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- CN218453189U CN218453189U CN202222455569.XU CN202222455569U CN218453189U CN 218453189 U CN218453189 U CN 218453189U CN 202222455569 U CN202222455569 U CN 202222455569U CN 218453189 U CN218453189 U CN 218453189U
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- rotating shaft
- arc
- sleeve
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- 238000003475 lamination Methods 0.000 claims abstract description 56
- 230000005540 biological transmission Effects 0.000 claims description 4
- 238000010586 diagram Methods 0.000 description 7
- 239000002994 raw material Substances 0.000 description 5
- 238000001125 extrusion Methods 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005314 correlation function Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 210000001503 joint Anatomy 0.000 description 1
- 238000009428 plumbing Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
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Abstract
The utility model discloses a flexible mould of variable diameter, including pivot, fluted disc, lead screw axle, arc lamination and connecting rod, the middle part of pivot is the polygon. The middle part of pivot is located to the cover dish cover, and the cover dish includes first cover dish and second cover dish. The screw shaft is rotationally connected with the rotating shaft and penetrates through the sleeve disc; the screw rod shaft is provided with a left-handed thread and a right-handed thread which are adjacent, the left-handed thread is connected with the first sleeve disk thread, and the right-handed thread is connected with the second sleeve disk thread. The arc-shaped lamination is covered above the other arc-shaped lamination, and the plurality of arc-shaped laminations are connected end to form the cylindrical die body. The connecting rods comprise a first connecting rod and a second connecting rod, one end of the first connecting rod is rotatably connected with the first sleeve disc, and the other end of the first connecting rod is rotatably connected with the arc-shaped lamination; one end of the second connecting rod is rotatably connected with the second sleeve, and the other end of the second connecting rod is rotatably connected with the arc-shaped lamination. When the first sleeve disc and the second sleeve disc are far away or close to each other, the arc-shaped lamination plates are close to or far away from the rotating shaft, and the radius of the cylindrical die body is reduced or enlarged.
Description
Technical Field
The utility model relates to the technical field of molds, specifically be flexible mould of reducing.
Background
When cylindrical products are produced, raw materials need to be wound on a die in a rotating mode, and after the raw materials are solidified, the products are taken down from the die. The patent (CN 107035145B) discloses a reducing mould plumbing installation convenient to pouring drawing of patterns, and the mould pipeline is along four pipeline fan pieces that the axial cutting becomes two bisymmetry, is first pipeline fan piece, second pipeline fan piece, third pipeline fan piece and fourth pipeline fan piece respectively, the both sides of first pipeline fan piece and second pipeline fan piece and third pipeline fan piece correspond the limit and adopt the inclined plane butt joint, mould pipeline center department is equipped with the pivot, the equipartition is provided with a plurality of axle sleeves in the pivot, the axle sleeve is connected through elastic telescopic piece respectively with second pipeline fan piece and third pipeline fan piece, the axle sleeve passes through the extensible member with first pipeline fan piece and fourth pipeline fan piece and is connected, is equipped with a screw-thread fit's silk braid in the pivot of every axle sleeve below, the silk braid passes through linking hub connection with the extensible member. When the device is reset, the first pipeline fan blade and the fourth pipeline fan blade are not fixed, namely, the thread sleeve can rotate in the same direction with the rotating shaft, so that the resetting is inconvenient; furthermore, when the device is used for reducing the diameter, the first pipeline fan blade and the fourth pipeline fan blade shrink towards the axis direction of the mould pipeline firstly, the first pipeline fan blade and the fourth pipeline fan blade extrude the second pipeline fan blade and the third pipeline fan blade respectively through the bevel edges at two sides, the second pipeline fan blade and the third pipeline fan blade also shrink towards the axis direction of the mould pipeline through the extrusion spring, and when the first pipeline fan blade extrudes the second pipeline fan blade and the third pipeline fan blade through the bevel edges at two sides, the first pipeline fan blade on the mould can deform to influence the shape of a product.
SUMMERY OF THE UTILITY MODEL
In order to solve the problem that the mould can produce extrusion deformation among the prior art, the utility model provides a but reducing telescopic mould, include:
the middle part of the rotating shaft is polygonal;
the center of the sleeve disc is provided with a through hole, the shape of the through hole is the same as the shape of the cross section of the middle part of the rotating shaft, and the sleeve disc is sleeved on the middle part of the rotating shaft; the set of discs comprises a first set of discs and a second set of discs;
the screw rod shaft is rotationally connected with the rotating shaft and penetrates through the sleeve disc; the screw rod shaft is provided with a left-handed thread and a right-handed thread which are adjacent, the left-handed thread is connected with the first sleeve disk thread, and the right-handed thread is connected with the second sleeve disk thread;
the arc-shaped lamination is covered above the other arc-shaped lamination, and the arc-shaped laminations are connected end to form a cylindrical die body;
the connecting rod comprises a first connecting rod and a second connecting rod, one end of the first connecting rod is rotatably connected with the first sleeve disc, and the other end of the first connecting rod is rotatably connected with the arc-shaped lamination; one end of the second connecting rod is rotatably connected with the second sleeve, and the other end of the second connecting rod is rotatably connected with the arc-shaped lamination.
As a further improvement of the above technical solution:
the arc-shaped lamination comprises a flat part and a convex block part, wherein the convex block part is positioned on the inner side of the flat part and is connected with one side of the flat part; the flat part covers the other arc-shaped lamination, and the connecting rod is rotatably connected with the lug part.
One end of each connecting rod is rotatably connected with one side of the sleeve disc at a certain distance, and the other end of each connecting rod is rotatably connected with the arc-shaped lamination and adjacent to the arc-shaped lamination.
The sleeve disc is provided with a plurality of rollers, and the rollers are tangent to the surface of the rotating shaft and used for reducing the friction force between the sleeve disc and the rotating shaft.
The number of the screw rod shafts is multiple, and the screw rod shafts are uniformly distributed along the outer side of the rotating shaft.
The driving piece is connected with the rotating shaft, and the output end of the driving piece is in transmission connection with the screw shaft and used for driving the screw shaft to rotate synchronously.
The tail end of the rotating shaft is cylindrical; the supporting seat comprises a base, a supporting frame and an expansion link, the supporting frame is rotatably connected with the base, one end of the expansion link is connected with the supporting frame, and the other end of the expansion link is connected with the base and used for rotating the supporting frame; the top end of the support frame is rotatably connected with two first idler wheels and a first limiting ring, and the two first idler wheels are arranged in parallel and are axially parallel and used for bearing the rotating shaft; the first limiting ring is arranged above the first supporting roller and used for limiting the tail end of the rotating shaft.
The motor is connected with the bracket, and the output end of the motor is connected with the rotating shaft and used for driving the rotating shaft; the top end of the bracket is rotatably connected with two second idler wheels and a second limiting ring, and the two second idler wheels are arranged in parallel and are axially parallel and used for bearing the rotating shaft; the second limiting ring is arranged above the second supporting roller and used for limiting the head end of the rotating shaft.
The output end of the motor is connected with the rotating shaft through a universal shaft; the lifting device is characterized by further comprising a lifting piece, wherein the lifting piece is arranged below the rotating shaft and connected with the support, and the output end of the lifting piece is connected with the rotating shaft.
Compared with the prior art, the beneficial effects of the utility model are as follows:
(1) The utility model has the advantages that the screw shaft is rotationally connected with the rotating shaft, the surface of the screw shaft is provided with the adjacent left-handed thread and right-handed thread, the left-handed thread is connected with the first sleeve screw thread, the right-handed thread is connected with the second sleeve screw thread, and when the screw shaft rotates, the first sleeve and the second sleeve can be far away from or close to each other; rotate through setting up head rod one end and first sleeve disc and be connected, the other end rotates with the arc lamination to be connected, and second connecting rod one end rotates with the second sleeve disc simultaneously and is connected, and the other end rotates with the arc lamination to be connected, when first sleeve disc and second sleeve disc are kept away from each other or are close to each other, the pivot can be kept away from or be close to the arc lamination to change the internal diameter of cylinder mould body. The arc-shaped laminations are driven to move by the screw rod shaft, the adjacent arc-shaped laminations cannot be extruded, the screw rod shaft is rotationally connected with the rotating shaft, and the arc-shaped laminations can be reset by rotating the screw rod shaft.
(2) A stable triangular structure is formed between the two connecting rods and the sleeve disc, so that the movement track of the arc-shaped lamination is stable.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is an enlarged view at A in FIG. 1;
FIG. 3 is an enlarged view at B in FIG. 1;
fig. 4 is a schematic view of the internal structure of the present invention;
FIG. 5 is an enlarged view at C of FIG. 4;
FIG. 6 is a schematic view of the screw shaft and the sleeve disk in cooperation;
FIG. 7 is a schematic view of the support base in different states;
fig. 8 is a schematic view of the engagement of the shaft and the second idler wheel.
Reference numerals:
1. a rotating shaft; 2. sleeving a disc; 21. a through hole; 22. a first set of discs; 23. a second set of discs; 24. a roller; 3. a screw shaft; 31. left-handed threads; 32. right-hand threads; 33. a drive member; 4. arc-shaped lamination; 41. a flat portion; 42. a bump portion; 5. a cylindrical die body; 6. a connecting rod; 61. a first connecting rod; 62. a second connecting rod; 7. a supporting seat; 71. a base; 72. a support frame; 73. a telescopic rod; 74. a first idler wheel; 75. a first limit ring; 8. a support; 81. a second idler wheel; 82. a second stop collar; 91. a motor; 92. and (4) a jacking piece.
Detailed Description
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings and examples. The following examples are intended to illustrate the invention, but are not intended to limit the scope of the invention. Various embodiments or examples and features of various embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Fig. 1 illustrates the overall structure diagram of the present invention, fig. 4 illustrates the internal structure diagram of the present invention, fig. 5 is an enlarged view of C in fig. 4, fig. 6 illustrates the matching diagram of the screw shaft 3 and the sleeve disc 2, as shown in fig. 1 and fig. 4-6, the diameter-variable telescopic die of the present embodiment includes a rotating shaft 1, a sleeve disc 2, a screw shaft 3, an arc-shaped lamination 4 and a connecting rod 6, and the middle part of the rotating shaft 1 is a polygon. The center of the sleeve disc 2 is provided with a through hole 21, the shape of the through hole 21 is the same as the shape of the cross section of the middle part of the rotating shaft 1, the sleeve disc 2 is sleeved on the middle part of the rotating shaft 1, and the sleeve disc 2 cannot rotate relative to the rotating shaft 1 when the through hole 21 of the sleeve disc 2 is attached to the rotating shaft 1 because the rotating shaft 1 is polygonal. The sleeve 2 comprises a first sleeve 22 and a second sleeve 23.
The screw shaft 3 is rotationally connected with the rotating shaft 1 and penetrates through the sleeve disc 2; the screw shaft 3 has a left-hand thread 31 and a right-hand thread 32 adjacent to each other, the left-hand thread 31 being screwed to the first sleeve 22, and the right-hand thread 32 being screwed to the second sleeve 23. When the screw shaft 3 is rotated, the first sleeve 22 and the second sleeve 23 move toward or away from each other.
The arc-shaped lamination 4 is covered above another arc-shaped lamination 4, and a plurality of arc-shaped laminations 4 are connected end to form a cylindrical die body 5. As the overlapping area between the arc-shaped laminations 4 becomes larger, the diameter of the cylindrical die body 5 becomes smaller and vice versa.
The connecting rod 6 comprises a first connecting rod 61 and a second connecting rod 62, one end of the first connecting rod 61 is rotatably connected with the first sleeve 22, and the other end of the first connecting rod is rotatably connected with the arc-shaped lamination 4; one end of the second connecting rod 62 is rotatably connected to the second sleeve 23, and the other end is rotatably connected to the arc-shaped lamination 4. When the first sleeve 22 and the second sleeve 23 are far away from each other, the first connecting rod 61 and the second connecting rod 62 pull the arc-shaped lamination 4 away from the rotating shaft 1, and the radius of the cylindrical die body 5 is increased; when the first and second chucks 22 and 23 are close to each other, the first and second connecting rods 61 and 62 push the arc-shaped laminations 4 close to the rotary shaft 1, and the radius of the cylindrical die body 5 becomes smaller.
The utility model discloses a set up screw shaft 3 and pivot 1 and rotate and be connected, and screw shaft 3 surface sets up adjacent left-handed screw 31 and right-handed screw 32, and left-handed screw 31 and first set of dish 22 threaded connection, and right-handed screw 32 and second set of dish 23 threaded connection, when screw shaft 3 rotated, first set of dish 22 and second set of dish 23 can be kept away from each other or be close to each other; through setting up first connecting rod 61 one end and being connected with first sleeve 22 rotation, the other end rotates with arc lamination 4 and is connected, and second connecting rod 62 one end rotates with second sleeve 23 to be connected simultaneously, and the other end rotates with arc lamination 4 and is connected, when first sleeve 22 and second sleeve 23 keep away from each other or are close to each other, arc lamination 4 can keep away from or be close to pivot 1 to change the internal diameter of cylindrical die body 5. The arc-shaped laminations 4 are driven to move by the screw shaft 3, the adjacent arc-shaped laminations 4 cannot be extruded, the screw shaft 3 is rotationally connected with the rotating shaft 1, and the arc-shaped laminations 4 can be reset by rotating the screw shaft 3.
According to an embodiment of the present invention, fig. 1 illustrates an overall structural schematic view of the present invention, fig. 3 is an enlarged view of a position B in fig. 1, fig. 6 illustrates a matching schematic view of the screw shaft 3 and the sleeve disc 2, as shown in fig. 1, fig. 3 and fig. 6, the arc-shaped lamination 4 includes a flat portion 41 and a convex portion 42, and the convex portion 42 is located inside the flat portion 41 and connected to one side of the flat portion 41; the flat part 41 is covered on the other arc-shaped lamination 4, and the connecting rod 6 is rotatably connected with the lug part 42.
According to the embodiment of the present invention, as shown in fig. 4-6, one end of two connecting rods 6 is respectively connected with one side of the sleeve disk 2 in a rotating manner, and is separated by a certain distance, and the other end is connected with the arc-shaped lamination 4 in a rotating manner, and is adjacent to the arc-shaped lamination. A stable triangular structure is formed between the two connecting rods 6 and the sleeve disc 2, so that the movement track of the arc-shaped lamination 4 is stable, the triangle can be an isosceles triangle, and the arc-shaped lamination 4 moves along the middle line of the isosceles triangle.
According to the utility model discloses an embodiment, set 2 is equipped with a plurality of gyro wheels 24, and gyro wheel 24 is tangent with 1 surface of pivot for reduce the frictional force between set 2 and the pivot 1. When the friction force between the sleeve disc 2 and the rotating shaft 1 is small, the movement of the sleeve disc 2 relative to the rotating shaft 1 is more stable.
According to the utility model discloses an embodiment, the quantity of lead screw axle 3 is a plurality of, and a plurality of lead screw axles 3 are along the 1 outside evenly distributed of pivot. The screw shafts 3 synchronously drive the sleeve disc 2 to move, so that the sleeve disc 2 moves more stably relative to the rotating shaft 1.
According to the utility model discloses an embodiment still includes driving piece 33, and driving piece 33 is connected with pivot 1, and the output and the screw shaft 3 transmission of driving piece 33 are connected for drive screw shaft 3 synchronous revolution. The transmission connection mode can be that a gear is matched with a toothed chain.
According to the embodiment of the present invention, fig. 7 illustrates different state schematic diagrams of the supporting seat 7, and as shown in fig. 1, fig. 3 and fig. 7, the end of the rotating shaft 1 is cylindrical. The support is characterized by further comprising a support base 7, wherein the support base 7 comprises a base 71, a support frame 72 and an expansion rod 73, the support frame 72 is rotatably connected with the base 71, one end of the expansion rod 73 is connected with the support frame 72, and the other end of the expansion rod 73 is connected with the base 71 and used for rotating the support frame 72. The telescopic rod 73 may be a hydraulic rod. When the telescopic rod 73 is extended, the supporting frame 72 is perpendicular to the base 71, and when the telescopic rod 73 is shortened, the supporting frame 72 is parallel to the base 71. The top end of the supporting frame 72 is rotatably connected with two first supporting rollers 74 and a first limiting ring 75, and the two first supporting rollers 74 are arranged in parallel and are axially parallel and used for bearing the rotating shaft 1; the first limit ring 75 is disposed above the first idler wheel 74, and is used for limiting the end of the rotating shaft 1. When the supporting frame 72 is perpendicular to the base 71, the rotating shaft 1 is disposed above the first supporting roller 74, the first limiting ring 75 is disposed above the rotating shaft 1, and the rotating shaft 1 can rotate above the first supporting roller 74.
According to the embodiment of the present invention, fig. 1 illustrates the overall structure schematic diagram of the present invention, fig. 2 is an enlarged view of a position a in fig. 1, fig. 4 illustrates the internal structure schematic diagram of the present invention, fig. 8 illustrates the matching schematic diagram of the rotating shaft 1 and the second idler wheel 81, as shown in fig. 1, fig. 2, fig. 4 and fig. 8, the present invention further includes a bracket 8 and a motor 91, the motor 91 is connected to the bracket 8, and the output end of the motor 91 is connected to the rotating shaft 1 for driving the rotating shaft 1; the top end of the bracket 8 is rotatably connected with two second supporting rollers 81 and a second limiting ring 82, and the two second supporting rollers 81 are arranged in parallel and are axially parallel to each other and used for bearing the rotating shaft 1; the second limiting ring 82 is disposed above the second supporting roller 81 and used for limiting the head end of the rotating shaft 1.
According to the utility model discloses an embodiment, the output of motor 91 is connected with pivot 1 through the cardan shaft. Still include jacking 92, jacking 92 can be cylinder or hydro-cylinder, and jacking 92 locates the below of pivot 1, and is connected with support 8, and jacking 92's output is connected with pivot 1. When the rotating shaft 1 stops rotating, the second limiting ring 82 does not limit the rotating shaft 1, the jacking piece 92 jacks up the rotating shaft 1, and the product can be taken out from the tail end of the mold.
The utility model discloses the theory of operation:
s1, installing a rotating shaft 1: the telescopic rod 73 drives the supporting frame 72 to be vertical to the base 71, the rotating shaft 1 is arranged above the first supporting roller 74, and the first limiting ring 75 and the second limiting ring 82 respectively cover the rotating shaft 1;
s2, winding raw materials: starting the motor 91, starting the rotating shaft 1 to rotate, and winding the raw materials to the outer surface of the arc-shaped lamination 4;
s3, demolding: after the raw materials are solidified, the driving part 33 drives the screw shaft 3 to rotate, the arc-shaped lamination 4 is close to the rotating shaft 1, the outer diameter of the cylindrical die body 5 is reduced, the first limiting ring 75 and the second limiting ring 82 are unfastened, the supporting frame 72 is driven by the telescopic rod 73 to be parallel to the base 71, the head end of the rotating shaft 1 is jacked up by the jacking part 92, the product is taken out from the tail end of the die, the driving part 33 drives the screw shaft 3 to reversely rotate, and the arc-shaped lamination 4 is far away from the rotating shaft 1 and is reset.
The utility model discloses in the technical scheme of each embodiment can make up, technical feature in the embodiment also can make up and form new technical scheme, the structure that does not mention, can realize the correlation function in the embodiment is prior art.
The above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art can easily think of the changes or substitutions within the technical scope of the present invention, and all should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (9)
1. A diameter-variable telescopic die is characterized by comprising:
the middle part of the rotating shaft is polygonal;
the center of the sleeve disc is provided with a through hole, the shape of the through hole is the same as the cross section shape of the middle part of the rotating shaft, and the sleeve disc is sleeved in the middle part of the rotating shaft; the set of discs comprises a first set of discs and a second set of discs;
the screw rod shaft is rotationally connected with the rotating shaft and penetrates through the sleeve disc; the screw rod shaft is provided with a left-handed thread and a right-handed thread which are adjacent, the left-handed thread is connected with the first sleeve disk thread, and the right-handed thread is connected with the second sleeve disk thread;
the arc-shaped lamination is covered above the other arc-shaped lamination, and the arc-shaped laminations are connected end to form a cylindrical die body;
the connecting rod comprises a first connecting rod and a second connecting rod, one end of the first connecting rod is rotatably connected with the first sleeve disc, and the other end of the first connecting rod is rotatably connected with the arc-shaped lamination; one end of the second connecting rod is rotatably connected with the second sleeve, and the other end of the second connecting rod is rotatably connected with the arc-shaped lamination.
2. The variable diameter telescopic die of claim 1, wherein the arc-shaped lamination includes a flat portion and a convex portion, the convex portion being located inside the flat portion and connected to one side of the flat portion; the flat part covers the other arc-shaped lamination, and the connecting rod is rotatably connected with the lug boss part.
3. The variable diameter telescopic die according to claim 1 or 2, wherein one end of each of the two connecting rods is rotatably connected with one side of the sleeve disc at a certain distance, and the other end of each of the two connecting rods is rotatably connected with and adjacent to the arc-shaped lamination.
4. The telescopic die of claim 1, wherein the sleeve is provided with a plurality of rollers, the rollers being tangent to the surface of the rotating shaft for reducing friction between the sleeve and the rotating shaft.
5. The variable diameter telescopic die according to claim 1 or 4, wherein the number of the screw shafts is plural, and the plural screw shafts are uniformly distributed along the outer side of the rotating shaft.
6. The diameter-variable telescopic die as claimed in claim 5, further comprising a driving member, wherein the driving member is connected to the rotating shaft, and an output end of the driving member is in transmission connection with the screw shaft for driving the screw shaft to rotate synchronously.
7. The variable diameter telescopic die of claim 1, wherein the end of the rotating shaft is cylindrical; the supporting seat comprises a base, a supporting frame and a telescopic rod, wherein the supporting frame is rotatably connected with the base, one end of the telescopic rod is connected with the supporting frame, and the other end of the telescopic rod is connected with the base and used for rotating the supporting frame; the top end of the support frame is rotatably connected with two first idler wheels and a first limiting ring, and the two first idler wheels are arranged in parallel and are axially parallel and used for bearing the rotating shaft; the first limiting ring is arranged above the first supporting roller and used for limiting the tail end of the rotating shaft.
8. The variable-diameter telescopic die according to claim 1, further comprising a bracket and a motor, wherein the motor is connected with the bracket, and the output end of the motor is connected with the rotating shaft and used for driving the rotating shaft; the top end of the bracket is rotatably connected with two second idler wheels and a second limiting ring, and the two second idler wheels are arranged in parallel and are axially parallel and used for bearing the rotating shaft; the second limiting ring is arranged above the second supporting roller and used for limiting the head end of the rotating shaft.
9. The telescopic die of claim 8, wherein the output end of the motor is connected with the rotating shaft through a universal shaft; the lifting device is characterized by further comprising a lifting piece, wherein the lifting piece is arranged below the rotating shaft and connected with the support, and the output end of the lifting piece is connected with the rotating shaft.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222455569.XU CN218453189U (en) | 2022-09-16 | 2022-09-16 | Diameter-variable telescopic die |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222455569.XU CN218453189U (en) | 2022-09-16 | 2022-09-16 | Diameter-variable telescopic die |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218453189U true CN218453189U (en) | 2023-02-07 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222455569.XU Active CN218453189U (en) | 2022-09-16 | 2022-09-16 | Diameter-variable telescopic die |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218453189U (en) |
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2022
- 2022-09-16 CN CN202222455569.XU patent/CN218453189U/en active Active
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