CN216911844U - Elbow necking device and lantern ring equipment - Google Patents

Abstract

The utility model provides an elbow necking device and a lantern ring device, relates to the technical field of elbow processing, and aims to solve the problem of difficult assembly caused by overlarge elbow pipe orifice. The elbow necking device comprises a first supporting seat, a clamping jaw structure and a sliding sleeve, wherein the clamping jaw structure comprises a fixing part and a clamping jaw part, the fixing part is fixedly connected with the first supporting seat, the clamping jaw part comprises a plurality of clamping jaws, and the plurality of clamping jaws have an opening position and a clamping position, wherein in the clamping position, the plurality of clamping jaws are abutted to form a cylindrical cavity with a set aperture; the sliding sleeve is sleeved on the clamping jaw structure and can drive the clamping jaw to switch between an opening position and a clamping position in the sliding process. The lantern ring device comprises the elbow necking device. The utility model can reduce the pipe orifice of the elbow.

Description

Elbow necking device and lantern ring equipment

Technical Field

The utility model relates to the technical field of elbow processing, in particular to an elbow necking device and a lantern ring device.

Background

The heat exchanger is widely applied in the air conditioning industry, and the development of the air conditioning technology puts more strict requirements on the heat exchange performance of the heat exchanger. The heat exchanger structure and the related molding process have a large influence on the heat exchange performance of the heat exchanger.

The heat exchanger of the air conditioner is usually provided with an elbow, and in the processing process of the elbow, in order to prevent the copper pipe from being bent and flattened, a unidirectional core is required to be inserted when the copper pipe is bent. After bending, the core metal is pushed out, so that the pipe orifice of the elbow is larger. When the elbow with larger pipe orifice is assembled and welded, the situation of difficult assembly can occur, and the large number of elbows are not assembled in place, which directly causes the problems of welding leakage, welding blockage and the like to be prominent, thus leading the heat exchange efficiency to be lost by more than 10 percent.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide an elbow necking device to solve the technical problem of difficult assembly caused by larger elbow pipe orifice.

The utility model provides an elbow necking device, which comprises a first supporting seat, a clamping jaw structure and a sliding sleeve, wherein the clamping jaw structure comprises a fixing part and a clamping jaw part, the fixing part is fixedly connected with the first supporting seat, the clamping jaw part comprises a plurality of clamping jaws, and the clamping jaws have an opening position and a clamping position, wherein in the clamping position, the clamping jaws are tightly abutted to form a cylindrical cavity with a set aperture; the sliding sleeve is sleeved on the clamping jaw structure and can drive the clamping jaw to switch between the opening position and the clamping position in the sliding process.

By arranging the elbow necking device mainly comprising the first support seat, the clamping jaw structure and the sliding sleeve, when the elbow needs to be subjected to necking operation, the clamping jaw can be firstly positioned at the opening position, and the elbow enters a space surrounded by the clamping jaws positioned at the opening position; then, the sliding sleeve slides on the clamping jaw structure, when the sliding sleeve slides to a plurality of clamping jaws to abut against each other, the plurality of clamping jaws are switched to a clamping position from an opening position, at the moment, the plurality of clamping jaws form a cylindrical cavity with a set aperture, and the elbow is surrounded by the plurality of clamping jaws, so that the elbow reduces the outer diameter of the pipe orifice of the elbow to be equal to the set aperture under the clamping action of the plurality of clamping jaws, and the necking operation of the elbow is realized.

The elbow necking device can realize the necking operation of the elbow, so that the pipe orifices of the elbow are kept at the same outer diameter, and the technical problem of difficult assembly caused by the larger pipe orifice of the elbow is solved. Moreover, the mode that this elbow throat device utilized the tight throat of clamp to replace traditional flaring die throat, when realizing the elbow throat, can also avoid the elbow bottom to flatten, the throat is effectual, the uniformity is high, and can not cause adverse effect to other positions of elbow.

Further, the outer surface of the clamping jaw comprises a first conical surface, the first conical surface is connected with the fixing portion, and the diameter of the first conical surface is gradually increased from the fixing portion to the clamping jaw portion. The guide to the sliding sleeve in the sliding process can be realized by utilizing the smaller diameter part of the first conical surface, so that the sliding sleeve can be conveniently sleeved into the claw part, and the necking operation of the elbow can be smoothly completed.

Further, the outer surface of the clamping jaw further comprises a second conical surface, the second conical surface is arranged at one end, away from the fixing portion, of the clamping jaw, and the diameter of the second conical surface is gradually reduced from the fixing portion to the direction of the clamping jaw portion. So set up for the clamping jaw portion is binding off form at its tip, can reduce clamping jaw portion tip and take up in radial space to avoid clamping jaw portion and lantern ring equipment other moulds to take place to interfere.

Furthermore, the outer surface of the clamping jaw further comprises a cylindrical surface, the cylindrical surface is connected between the first conical surface and the second conical surface, and the bus direction of the cylindrical surface is parallel to the sliding direction of the sliding sleeve. So set up for comparatively gentle transition can be carried out between first conical surface and the second conical surface, avoided because of first conical surface and second conical surface junction too sharp-pointed and the easy fish tail operating personnel's that leads to the situation.

Further, the fixed part is provided with first external screw thread, first screw hole has been seted up to first supporting seat, the fixed part pass through first external screw thread with first screw hole threaded connection. So set up for can pull down it and change after the clamping jaw takes place to damage, reduced the maintenance cost to elbow throat device.

Further, the elbow necking device further comprises a second supporting seat, and the sliding sleeve is fixedly arranged on the second supporting seat. So set up, can realize the support to the sliding sleeve, avoid the great support in clamping jaw structure's fixed part in sliding sleeve aperture, and the eccentric wear that causes the fixed part.

Furthermore, the sliding sleeve is provided with a second external thread, the second supporting seat is provided with a second threaded hole, and the sliding sleeve is in threaded connection with the second threaded hole through the second external thread. So set up for can take place to pull down it after the sliding sleeve damages and change, moreover, threaded connection is reliable, low cost.

Furthermore, the number of the clamping jaws is four, and the four clamping jaws are arranged at equal intervals along the circumferential direction of the clamping jaw part. So set up, not only make in the throat operation process, the atress of elbow mouth of pipe along each position department of its circumference is comparatively even, moreover, is convenient for process manufacturing.

Further, the fixing part is of a hollow structure. With this arrangement, not only can the weight of the jaw structure be reduced, but also the strength of the jaw structure can be improved, thereby reducing the flexural deformation generated in the jaw structure.

The second purpose of the utility model is to provide a lantern ring device to solve the technical problem of difficult assembly caused by the larger elbow pipe orifice.

The lantern ring equipment provided by the utility model comprises the elbow necking device.

By providing the above-mentioned elbow necking device in the lantern ring device, accordingly, the lantern ring device has all the advantages of the above-mentioned elbow necking device, which are not described in detail herein.

Further, the lantern ring equipment further comprises an elbow clamping device, the elbow clamping device is configured to shape and fix an elbow, the elbow clamping device comprises an upper clamping die and a lower clamping die which are arranged oppositely, a first half groove is formed in one face, facing the lower clamping die, of the upper clamping die, a second half groove is formed in one face, facing the upper clamping die, of the lower clamping die, the second half groove is in butt joint with the first half groove to form an elbow fixing cavity, and the shape of the elbow is matched with the shape of the elbow fixing cavity. By arranging the elbow clamping device, the elbow can be reliably fixed and reshaped, so that the elbow can be smoothly reduced under the action of the elbow reducing device.

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 embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.

Fig. 1 is a schematic structural diagram of an elbow necking device according to an embodiment of the present invention for performing an elbow necking operation;

fig. 2 is a schematic front view of an elbow necking device according to an embodiment of the present invention;

FIG. 3 is a schematic front view of a jaw structure provided in accordance with an embodiment of the present invention;

fig. 4 is a schematic side view of a jaw structure according to an embodiment of the present invention.

Description of the reference numerals:

010-an elbow reducing device; 020-elbow holding device; 030-elbow;

100-a first support; 200-a jaw structure; 300-a sliding sleeve; 400-a second support seat;

210-a fixed part; 211 — a first external thread; 220-a jaw portion; 221-a clamping jaw; 222-a first taper; 223-a second tapered surface; 224-cylindrical surface; 225-narrow slit;

021-clamping the mold; 022-lower clamping die.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. It should be understood that the specific embodiments described herein are merely illustrative of the utility model and are not intended to limit the utility model.

Fig. 1 is a schematic structural diagram of the elbow reducing device 010 of this embodiment when reducing the elbow 030, and fig. 2 is a schematic structural diagram of the elbow reducing device 010 of this embodiment as seen from the front. As shown in fig. 1 and fig. 2, the present embodiment provides an elbow necking device 010, which includes a first supporting seat 100, a clamping jaw structure 200 and a sliding sleeve 300, wherein the clamping jaw structure 200 includes a fixing portion 210 and a clamping jaw portion 220, specifically, the fixing portion 210 is fixedly connected to the first supporting seat 100, the clamping jaw portion 220 includes a plurality of clamping jaws 221, and the plurality of clamping jaws 221 have an open position and a clamping position, wherein in the clamping position, the plurality of clamping jaws 221 abut against a cylindrical cavity with a set bore diameter; the sliding sleeve 300 is sleeved on the clamping jaw structure 200 and can drive the clamping jaw 221 to switch between the open position and the clamping position in the sliding process.

By arranging the elbow necking device 010 mainly composed of the first support seat 100, the clamping jaw structure 200 and the sliding sleeve 300, when the elbow 030 needs to be subjected to necking operation, the clamping jaws 221 can be firstly positioned at the opening position, and the elbow 030 can enter a space surrounded by the plurality of clamping jaws 221 positioned at the opening position; then, the sliding sleeve 300 is slid on the clamping jaw structure 200, when the sliding sleeve 300 slides until the plurality of clamping jaws 221 abut against each other, the plurality of clamping jaws 221 are switched from the open position to the clamping position, at this time, the plurality of clamping jaws 221 form a cylindrical cavity with a set aperture, and since the elbow 030 is surrounded by the plurality of clamping jaws 221, the elbow 030 will reduce the outer diameter of the pipe orifice to be equal to the set aperture under the clamping action of the plurality of clamping jaws 221, thereby realizing the necking operation of the elbow 030.

This elbow throat device 010 can realize the throat operation of elbow 030 for the elbow 030 mouth of pipe all keeps at same external diameter, thereby has solved the difficult technical problem of assembly that the elbow 030 mouth of pipe leads to partially greatly. Moreover, the elbow necking device 010 utilizes a mode of clamping a necking to replace a mode of a traditional necking die, so that the bottom of the elbow 030 can be prevented from being flattened while the necking of the elbow 030 is realized, the necking effect is good, the consistency is high, and adverse effects on other parts of the elbow 030 are avoided.

In this embodiment, the set bore diameter may be 4.8mm, that is, the diameter of the cylindrical cavity formed by the clamping jaws 221 abutting together is 4.8mm, so that the nozzle of the elbow 030 can be reduced to an outer diameter of 4.8mm by the clamping action of the clamping jaws 221.

Fig. 3 is a front view of the clamping jaw structure 200 provided in this embodiment. Referring to fig. 2 and fig. 3, in the present embodiment, the outer surface of the clamping jaw 221 may include a first tapered surface 222, specifically, the first tapered surface 222 is connected to the fixing portion 210, and the diameter of the first tapered surface 222 gradually increases from the fixing portion 210 to the direction of the clamping jaw 220.

By providing the first tapered surface 222 connected to the fixing portion 210 on the outer surface of the clamping jaw 221, the sliding sleeve 300 will pass through the smaller diameter portion of the outer surface of the clamping jaw 221 and then pass through the larger diameter portion of the outer surface of the clamping jaw 221 when sliding to reduce the bend 030. The smaller diameter of the first tapered surface 222 can guide the sliding sleeve 300 during sliding, so that the sliding sleeve 300 can be conveniently sleeved into the claw portion 220 to smoothly finish necking operation of the elbow 030.

With continued reference to fig. 2 and fig. 3, in the present embodiment, the outer surface of the clamping jaw 221 may further include a second tapered surface 223, specifically, the second tapered surface 223 is disposed at an end of the clamping jaw 221 away from the fixing portion 210, and the diameter of the second tapered surface 223 gradually decreases from the fixing portion 210 to the clamping jaw portion 220.

The end part of the clamping jaw 221 is provided with the second taper surface 223, so that the clamping jaw part 220 is in a necking shape at the end part, the radial space occupation of the end part of the clamping jaw part 220 can be reduced, the interference between the clamping jaw part 220 and other molds of a lantern ring device is avoided, the clamping jaw part 220 can smoothly move to the area where the elbow 030 is located, and further, the necking operation can be smoothly completed.

With continued reference to fig. 2 and fig. 3, in this embodiment, the outer surface of the clamping jaw 221 may further include a cylindrical surface 224, specifically, the cylindrical surface 224 is connected between the first tapered surface 222 and the second tapered surface 223, and a generatrix direction of the cylindrical surface 224 is parallel to a sliding direction of the sliding sleeve 300.

The first conical surface 222 and the second conical surface 223 are connected by the cylindrical surface 224, so that the first conical surface 222 and the second conical surface 223 can be transited smoothly, and the situation that an operator is easily scratched due to the fact that the connection position of the first conical surface 222 and the second conical surface 223 is too sharp is avoided.

Fig. 4 is a schematic side view of the clamping jaw structure 200 provided in this embodiment. As shown in fig. 4, in the present embodiment, the number of the clamping jaws 221 is four, and the four clamping jaws 221 are arranged at equal intervals along the circumferential direction of the clamping jaw portion 220.

The clamping jaw part 220 comprises four clamping jaws 221, so that on one hand, in the process of necking operation, stress of the pipe orifice of the elbow 030 at each position along the circumferential direction is uniform, excessive burrs are not generated on the appearance of the elbow 030 after necking, and on the other hand, processing and manufacturing are facilitated.

In other embodiments, the jaws 221 may take other numbers, such as: three, five, etc., as long as effective necking of the elbow 030 can be achieved by the number of the jaws 221.

Referring to fig. 4, in the present embodiment, the fixing portion 210 is a hollow structure.

Through setting up fixed part 210 to hollow structure, not only can effectively alleviate the weight of clamping jaw structure 200 to alleviate the whole weight of this embodiment elbow throat device 010, moreover, can also improve the intensity of clamping jaw structure 200, thereby reduce the flexural deformation who produces in clamping jaw structure 200.

It should be noted that, in this embodiment, the jaw structure 200 may be formed by a tubular structure, specifically, four slits 225 extending in the axial direction may be formed at one end of the tubular structure, and then, a pipe section of the tubular structure, in which the slits 225 are formed, is bent, so as to form the jaw 221, which is formed by sequentially connecting the first tapered surface 222, the cylindrical surface 224, and the second tapered surface 223. The above-mentioned set bore diameter was 4.8mm, that is, the inner diameter of the tubular structure was 4.8 mm.

It should also be noted that, in this embodiment, when the clamping jaw 221 is in the open position, the inner portion of the clamping jaw 221 at the cylindrical surface 224 may form a cylindrical cavity with a diameter of 6 mm.

Referring to fig. 3, in the present embodiment, a first external thread 211 may be disposed on the fixing portion 210, and correspondingly, a first threaded hole is formed in the first supporting seat 100, so that the fixing portion 210 is in threaded connection with the first threaded hole through the first external thread 211.

So set up, can realize the fixed connection dismantled of clamping jaw structure 200 and first supporting seat 100, when clamping jaw structure 200 takes place to damage after long-term the use, can pull down clamping jaw structure 200 from first supporting seat 100, change, and need not to change whole equipment to the maintenance cost of this embodiment elbow throat device 010 has been reduced.

Referring to fig. 3, in the present embodiment, the first external thread 211 is disposed at an end of the fixing portion 210 away from the clamping portion 220, and the fixing portion 210 is disposed with a shoulder at a position close to the first external thread 211. By connecting the end of the fixing portion 210 to the first support base 100, the length of the fixing portion 210 can be shortened as much as possible, which not only reduces the material cost, but also further reduces the interference with other devices; through setting up the shaft shoulder, can realize spacing the installation of fixed part 210, avoid because of the inconsistent situation of clamping jaw portion 220 extension length that the fixed part 210 installation is excessive or install not target in place and lead to the uniformity of elbow 030 throat effect has been guaranteed.

Referring to fig. 1 and fig. 2, in the present embodiment, the elbow reducing device 010 may further include a second supporting seat 400, and the sliding sleeve 300 is fixedly disposed on the second supporting seat 400.

Through setting up second supporting seat 400, can realize the support to sliding sleeve 300, avoid the great support in clamping jaw structure 200's fixed part 210 in sliding sleeve 300 aperture, and the eccentric wear that causes fixed part 210.

In this embodiment, the aperture of the sliding sleeve 300 may be larger than the outer diameter of the fixing portion 210.

Specifically, in this embodiment, the sliding sleeve 300 is provided with a second external thread, the second supporting seat 400 is provided with a second threaded hole, and the sliding sleeve 300 is in threaded connection with the second threaded hole through the second external thread.

So set up, can realize the fixed connection dismantled of sliding sleeve 300 and second supporting seat 400, when sliding sleeve 300 takes place to damage after long-term the use, can pull down sliding sleeve 300 from second supporting seat 400, change, and need not to change whole equipment to the maintenance cost of this embodiment elbow throat device 010 has further been reduced. In addition, the threaded connection mode is reliable in connection and low in cost.

In this embodiment, the elbow reducing device 010 further includes a first frame, a first air cylinder, a second frame, and a second air cylinder (none of the four are shown), specifically, the first supporting seat 100 and the second supporting seat 400 are both mounted on the first frame, wherein the first supporting seat 100 is fixedly connected to the first frame, the second supporting seat 400 is movably disposed on the first frame, and the first air cylinder is mounted on the first frame and is used for driving the second supporting seat 400 to move on the first frame; the first rack is movably arranged on the second rack, and the second air cylinder is arranged on the second rack and used for driving the first rack to move on the second rack. The extension direction of the piston rod of the first cylinder and the extension direction of the piston rod of the second cylinder are both parallel to the sliding direction of the sliding sleeve 300.

When the elbow needs to be subjected to necking operation, the second cylinder can be firstly utilized to drive the first frame to move a first set distance (leftwards move under the view angles of fig. 1 and fig. 2), and at this time, the first frame, the first supporting seat 100, the second supporting seat 400 and the first cylinder which are installed on the first frame synchronously move the first set distance, so that the elbow 030 extends into the claw part 220; then, the first cylinder drives the second support seat 400 to move a second set distance (leftwards in the view of fig. 1 and 2) on the first frame, so that the sliding sleeve 300 slides to the maximum outer profile (cylindrical surface 224) of the clamping jaw 221 to provide a clamping force for the clamping jaw 221, thereby realizing the necking operation of the elbow 030. Wherein, after the second cylinder stops moving, the distance that the elbow 030 stretches into the claw part 220 can be controlled to be 4 mm.

After the necking operation of the elbow 030 is completed, the first support seat 100 and the second support seat 400 return to the original positions for the necking operation of the next elbow 030.

In addition, this embodiment also provides a lantern ring equipment, includes above-mentioned elbow throat device 010.

By providing the above-mentioned elbow reducing device 010 in the collar equipment, accordingly, the collar equipment has all the advantages of the above-mentioned elbow reducing device 010, which is not described in detail herein.

With continued reference to fig. 1, in the present embodiment, the collar apparatus may further include an elbow clamping device 020, the elbow clamping device 020 is configured to shape and fix the elbow 030, specifically, the elbow clamping device 020 includes an upper clamping mold 021 and a lower clamping mold 022 which are oppositely disposed, a first half groove is disposed on a side of the upper clamping mold 021 facing the lower clamping mold 022, a second half groove is disposed on a side of the lower clamping mold 022 facing the upper clamping mold 021, the second half groove and the first half groove are butted to form an elbow fixing cavity, wherein an outer shape of the elbow 030 matches a cavity shape of the elbow fixing cavity.

By arranging the elbow clamping device 020, the elbow 030 can be reliably fixed and orthopedic, so that the elbow 030 can smoothly perform necking operation under the action of the elbow necking device 010.

The elbow clamping device 020 can also perform flattening, looping and the like on the elbow 030, and in the present embodiment, only the main structure and function of the elbow clamping device 020 are schematically described.

It should be further noted that, in this embodiment, the impurity blowing station of the eight-station collar apparatus may be optimized, and the elbow reducing device 010 is added here.

Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the utility model as defined in the appended claims.

Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

In the above embodiments, descriptions of orientations such as "left", "right", "inside", "outside", and the like are based on the drawings.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the utility model. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. An elbow necking device is characterized by comprising a first supporting seat (100), a clamping jaw structure (200) and a sliding sleeve (300), wherein the clamping jaw structure (200) comprises a fixing part (210) and a clamping jaw part (220), the fixing part (210) is fixedly connected with the first supporting seat (100), the clamping jaw part (220) comprises a plurality of clamping jaws (221), and the clamping jaws (221) have an opening position and a clamping position, wherein in the clamping position, the clamping jaws (221) are abutted to form a cylindrical cavity with a set aperture; the sliding sleeve (300) is sleeved on the clamping jaw structure (200) and can drive the clamping jaw (221) to switch between the opening position and the clamping position in the sliding process.

2. The elbow necking device of claim 1, wherein the outer surface of the clamping jaw (221) comprises a first tapered surface (222), the first tapered surface (222) being connected to the fixing portion (210), and the diameter of the first tapered surface (222) gradually increases from the fixing portion (210) towards the clamping jaw portion (220).

3. The elbow necking device of claim 2, wherein the outer surface of the clamping jaw (221) further comprises a second tapered surface (223), the second tapered surface (223) is arranged at an end of the clamping jaw (221) away from the fixing portion (210), and the diameter of the second tapered surface (223) is gradually reduced from the fixing portion (210) towards the clamping jaw portion (220).

4. The elbow necking device according to claim 3, wherein the outer surface of the clamping jaw (221) further comprises a cylindrical surface (224), the cylindrical surface (224) is connected between the first conical surface (222) and the second conical surface (223), and the generatrix direction of the cylindrical surface (224) is parallel to the sliding direction of the sliding sleeve (300).

5. The bend necking device of any one of claims 1 to 4, wherein the fixing portion (210) is provided with a first external thread (211), the first support base (100) is provided with a first threaded hole, and the fixing portion (210) is in threaded connection with the first threaded hole through the first external thread (211).

6. The elbow reducer according to any one of claims 1-4, further comprising a second support (400), wherein the sliding sleeve (300) is fixedly arranged on the second support (400).

7. The elbow necking device according to claim 6, wherein the sliding sleeve (300) is provided with a second external thread, the second supporting seat (400) is provided with a second threaded hole, and the sliding sleeve (300) is in threaded connection with the second threaded hole through the second external thread.

8. The elbow necking device according to any one of claims 1 to 4, wherein the number of the clamping jaws (221) is four, and four clamping jaws (221) are arranged at equal intervals along the circumferential direction of the clamping jaw portion (220); and/or the fixing part (210) is of a hollow structure.

9. A thimble device comprising the elbow reducer of any one of claims 1-8.

10. The collar device according to claim 9, further comprising an elbow clamping device (020), the elbow clamping device (020) being configured to orthopedic and secure an elbow (030), the elbow clamping device (020) comprising an upper clamp die (021) and a lower clamp die (022) arranged oppositely, a face of the upper clamp die (021) facing the lower clamp die (022) being provided with a first half-groove, a face of the lower clamp die (022) facing the upper clamp die (021) being provided with a second half-groove, the second half-groove interfacing with the first half-groove to form an elbow securing cavity, an outer shape of the elbow (030) matching a cavity shape of the elbow securing cavity.

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