CN210647918U - Bending device of screen printing heating pipe - Google Patents

Abstract

The utility model discloses a bending device of a screen printing heating pipe, which comprises an installation bottom plate, wherein the installation bottom plate is provided with a static die, a movable die and a driving cylinder, and the device also comprises two moving pistons and two clamping rings; a chain is arranged between the two moving pistons, a tripping component is arranged at one end or two ends of the chain and connected with the corresponding moving piston, the two moving pistons are matched in the heating pipe at intervals in a sealing way so as to form a sealing cavity between the two moving pistons, and the sealing cavity is communicated with an external pump station; and the two moving pistons are respectively provided with a limiting mechanism, and when the two limiting mechanisms are in limiting fit at the two ends of the heating pipe, the chain is in a straightening state. The utility model discloses a bending device of screen printing heating pipe can guarantee that the heating pipe in-process of buckling can not destroy the silk screen printing zone of heating, simple structure, and it is convenient to buckle.

Description

Bending device of screen printing heating pipe

Technical Field

The utility model belongs to the technical field of battery heater's silk screen printing heating pipe processing technique and specifically relates to a bending device of silk screen printing heating pipe.

Background

Conventional screen printing heating tubes are generally straight tube type, and since the screen printing process needs to be performed on a flat surface, substantially all heaters of this type are straight tube type. If the straight tube type heater is applied to a battery pack heater of a new energy vehicle, the flexible arrangement of the straight tube type heater in a limited space on the new energy vehicle is severely restricted by the structural characteristics of the straight tube type heater. Meanwhile, the ceramic insulating material and the heating element material which are subjected to screen printing are arranged on the outer surface of the round tube, so that the ceramic insulating material and the heating element material have strong brittleness, the stainless steel tube which is bent by the traditional tube bending process needs to be completely pressurized, the diameter of the round tube is expanded due to pressure expansion, the insulating layer and the heating layer which are subjected to screen printing are directly torn, and the heating tube is damaged, so that the application of the traditional tube bending process on the screen printing heating tube is restricted.

Although the market also has a mode of connecting two heating pipes of straight pipes by using a section of bent pipe, the mode correspondingly brings more system load and is easy to leak, because the connection of three parts necessarily adds corresponding auxiliary materials such as sealing elements, clamping bands and the like, the more auxiliary materials bring more load to the system, and the sealing treatment of the connection position of the parts is difficult.

Therefore, aiming at the defects of the traditional equipment, the problem to be solved urgently is to develop a novel bending device applied to the screen printing heat-transfer pipe.

SUMMERY OF THE UTILITY MODEL

The utility model discloses the technical problem that will solve is: overcome prior art's not enough, provide one kind and can guarantee that the heating pipe bending in-process can not destroy the silk screen printing zone of heating, simple structure, the convenient bending device of silk screen printing heating pipe of bending.

The utility model adopts the technical proposal that: the bending device for the screen printing heating pipe comprises an installation base plate, wherein a static die, a movable die and a driving cylinder for driving the movable die to move towards the static die are arranged on the installation base plate, an arc-shaped groove is formed in the movable die, and an arc-shaped bulge matched with the arc-shaped groove is formed in the static die; the device also comprises two moving pistons which are arranged in the inner hole of the heating pipe in a sliding way and two clamping rings which are tightly pressed outside the heating pipe and correspond to the two moving pistons one by one; a chain is arranged between the two moving pistons, a tripping assembly is arranged at one end or two ends of the chain and connected with the corresponding moving piston, the two moving pistons are matched in the heating pipe at intervals in a sealing manner so as to form a sealing cavity between the two moving pistons, a liquid inlet pipe communicated with the sealing cavity is arranged on the moving piston, and a pipeline communicated with an external pump station is arranged at one end of the liquid inlet pipe, which is far away from the sealing cavity; and the two moving pistons are respectively provided with a limiting mechanism for limiting the preset position of the moving pistons in the heating pipe, and when the two limiting mechanisms are in limiting fit at the two ends of the heating pipe, the chain is in a straightening state.

As an improvement, one end of the chain is provided with a tripping assembly, a moving piston corresponding to the tripping assembly is marked as a first piston, and the other moving piston is marked as a second piston; one end of the chain is connected with the first piston through the tripping component, and the other end of the chain is connected with the second piston; and the limiting mechanism corresponding to the first piston is marked as a first limiting mechanism, and the limiting mechanism corresponding to the second piston is marked as a second limiting mechanism.

The improved tripping device comprises a first piston, a second piston and a tripping assembly, wherein the tripping assembly comprises a connecting block, one end of the connecting block is connected with the chain, and the other end of the connecting block is connected with the first piston in a sliding manner; one end of the connecting block, which is far away from the chain, is connected with a pull rod in a threaded manner, and the other end of the pull rod penetrates out of the first piston and extends to the first limiting mechanism. This tripping assembly structure is in order to make things convenient for breaking away from of first piston, second piston and heating body after the heating pipe is bent and is accomplished, as long as rotate the pull rod and make its and connecting block separation back, the connecting block just can separate with first piston.

The first piston is provided with a containing groove, the connecting block is in sliding fit in the containing groove, and a sealing ring is arranged between the connecting block and the containing groove; the opening end of the containing groove is provided with a locating groove, the connecting block is provided with a locating lug, and when the connecting block is installed in the containing groove, the locating lug is matched in the locating groove. The structure facilitates the connection of the connecting block and the pull rod, and can ensure the sealing performance of the sealing cavity.

In another improvement, the first limiting mechanism comprises a first limiting seat, the first limiting seat and the first piston are fixedly connected through a plurality of first connecting rods, a first limiting groove is arranged on the first limiting seat, and the first limiting groove is assembled at the end part of the heating pipe; the first limiting seat is provided with a first through hole, and one end, far away from the connecting block, of the pull rod penetrates through the first limiting groove. The limiting mechanism is used for limiting the first piston and ensuring that the first piston moves to a preset position in the heating pipe.

And when the pull rod is spirally matched on the connecting block to the extreme position, the first limiting boss is matched on the outer side surface of the first limiting seat. The first limiting boss structure is mainly used for ensuring that the screw connection of the pull rod and the connecting block reaches a set position, and further ensuring that the first piston can accurately reach a preset position when being installed every time.

And the second limiting mechanism comprises a second limiting seat, a plurality of second connecting rods are arranged between the second limiting seat and the second piston, one end of each second connecting rod is connected with the second piston, the other end of each second connecting rod penetrates through the second limiting seat in a sliding manner, and one end of each second connecting rod penetrating out of the second limiting seat is connected with a locking nut. In the structure, the second connecting rod can be driven to move outwards by screwing the locking nut, so that the second piston is driven to move towards the direction away from the first piston until the chain is straightened, and the two pistons move to corresponding positions.

In a further improvement, rollers are arranged on the mounting base plate at positions close to one side of the movable mold and corresponding to the two clamping rings, and the axes of the rollers are perpendicular to the mounting base plate; and the mounting bottom plate is also provided with a limiting seat for the end face of the clamping ring to be attached.

Compared with the prior art, the utility model discloses a bending device of screen printing heating pipe has following advantage:

1. the characteristic that the liquid contact surface proportion in the circular tube heating surface is higher is utilized, so that the heating efficiency of the cooling liquid is higher;

2. through the bending process, the limitation of installation and arrangement of the heating pipe in the original straight pipe mode can be avoided, the size of the product is more compact and flexible, and the applicability of the screen printing heating pipe in the application environment of the new energy vehicle battery pack can be improved;

3. in the device, except the matching of a piston mechanism with a restraint chain and a clamping ring structure, specifically, a sealing cavity is formed by two pistons corresponding to a bending area, hydraulic pressure is injected into the sealing cavity, and the defects of breakage, small inner diameter and the like of a heating pipe during bending treatment are avoided; in addition, the length of the elbow region is ensured through a chain, the clamping ring is arranged to ensure that the screen printing region on the outer side wall of the heating pipe is not influenced by the deformation of the hydraulic elbow region, and when the elbow region is pressurized, the expansion pressure cannot cause the deformation of the heating pipe; the bending machine can utilize the existing pipe bending equipment without changing too much, so that the cost is saved to the maximum extent. In addition, compared with the prior art, the bending device can enable the heating pipe to reach a smaller bend radius.

Drawings

Fig. 1 is a schematic diagram of the structure of the bending device of the screen printing heating pipe of the present invention.

Fig. 2 is an enlarged schematic view of a portion a in fig. 1.

Fig. 3 is a top view of the connecting block and first piston assembling structure of the present invention.

Fig. 4 is an enlarged schematic view of the structure at B in fig. 1.

Fig. 5 is an enlarged schematic view of the structure at C in fig. 1.

Fig. 6 is a graph showing the die closing distance and the hydraulic pressure change during the bending process of the heating pipe in the utility model.

Description of reference numerals:

100-heating a tube;

1-mounting bottom plate, 2-stationary die, 3-movable die, 3.1-arc groove, 4-driving cylinder, 5-clamping ring, 6-chain, 7-tripping component, 7.1-connecting block, 7.1.1-positioning lug, 7.2-pull rod, 7.2.1-first limit boss, 8-sealing cavity, 9-liquid inlet pipe, 10-pipeline, 11-first piston, 11.1-containing groove, 11.2-positioning groove, 12-second piston, 13-first limit mechanism, 13.1-first limit seat, 13.1.1-first limit groove, 13.1.2-first connecting hole, 13.2-first connecting rod, 14-second limit mechanism, 14.1-second limit seat, 14.1.1-second limit groove, 14.1.2-second connecting hole, 14.2-second connecting rod, 14.3-locking nut, 15-roller, 16-limiting seat

Detailed Description

The present invention will be further described with reference to the accompanying drawings and the following detailed description.

In the description of the present invention, it should be noted that the terms "lateral side", "end part" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which is only for convenience of description and simplification of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance, for the sake of distinguishing one from another.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "connected" and "attached" are to be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

As shown in fig. 1, the utility model provides a bending device of screen printing heating pipe, including mounting plate 1, it is concrete, this mounting plate 1 can set up on the support frame of corresponding height in the use to convenient processing.

Be equipped with quiet mould 2, movable mould 3 on the mounting plate 1 and be used for driving movable mould 3 towards the actuating cylinder 4 of the 2 motion of quiet mould, specifically, be equipped with arc recess 3.1 on the movable mould 3, be equipped with on quiet mould 2 with arc recess 3.1 assorted arc protruding 2.1, when movable mould 3 and quiet mould 2 compound die, the pipe fitting that is located between them is bent the shaping.

More specifically, the bending device further comprises two moving pistons which are slidably assembled in the inner hole of the heating tube 100, and two clamping rings 5 which are tightly pressed outside the heating tube 100 and correspond to the two moving pistons one by one; the clamping ring 5 may be a clamp structure or a two-piece structure, and after the two-piece structure is clamped outside the heating pipe 100, the two-piece structure is connected and clamped by corresponding fastening screws, so that the piston in the heating pipe 100 can be clamped and limited.

A chain 6 is arranged between the two moving pistons, a tripping component 7 is arranged at one end or two ends of the chain 6, the tripping component 7 is connected with the corresponding moving piston, and the two moving pistons are in spaced and sealed fit in the heating pipe 100 to form a sealed cavity 8 between the two moving pistons, specifically, a sealing ring is arranged between the outer side walls of the two moving pistons and the inner side wall of the heating pipe 100; in addition, a liquid inlet pipe 9 communicated with the sealing cavity 8 is arranged on the moving piston, and a pipeline 10 communicated with an external pump station is arranged at one end of the liquid inlet pipe 9, which is far away from the sealing cavity 8; the two moving pistons are respectively provided with a limiting mechanism for limiting the preset position of the two moving pistons in the heating pipe 100, and when the two limiting mechanisms are in limiting fit at the two ends of the heating pipe 100, the chain 6 is in a straightening state.

In this embodiment, a preferable structure is that a trip assembly 7 is disposed at one end of a chain 6, a moving piston corresponding to the trip assembly 7 is denoted as a first piston 11, and another moving piston is denoted as a second piston 12; namely, one end of the chain 6 is connected with the first piston 11 through the tripping component 7, and the other end is connected with the second piston 12; and the limit mechanism corresponding to the first piston 11 is denoted as a first limit mechanism 13, and the limit mechanism corresponding to the second piston 12 is denoted as a second limit mechanism 14. Of course, in other embodiments, the trip units 7 may be disposed at both ends of the chain 6.

More specifically, as shown in fig. 2, the trip assembly 7 includes a connecting block 7.1, one end of the connecting block 7.1 is connected to the chain 6, and the other end is slidably connected to the first piston 11; one end of the connecting block 7.1, which is far away from the chain 6, is screwed with a pull rod 7.2, and the other end of the pull rod 7.2 penetrates through the first piston 11 and extends to the first limiting mechanism 13. That is, when the first piston 11 needs to be separated from the second piston 12, the pull rod 7.2 is rotated to drive the pull rod 7.2 to be separated from the connecting block 7.1, and then the connecting block 7.1 can be separated from the first piston 11, so that the contact chain 6 restricts the first piston 11 and the second piston 12, and the first piston 11 and the second piston 12 can be freely separated.

The first piston 11 is provided with a containing groove 11.1, the connecting block 7.1 is in sliding fit in the containing groove 11.1, and a sealing ring is arranged between the connecting block 7.1 and the containing groove 11.1; specifically, a sealing ring groove is formed in the side wall of the connecting block 7.1, the sealing ring is clamped in the sealing ring groove, and the connecting block 7.1 and the first piston 11 are integrally assembled in the accommodating groove 11.1 after the sealing ring is used, so that the sealing fit between the connecting block 7.1 and the first piston 11 is realized. In addition, in order to prevent circumferential rotation between the connecting block 7.1 and the accommodating groove 11.1, a positioning groove 11.2 is arranged at the opening end of the accommodating groove 11.1, a positioning lug 7.1.1 is correspondingly arranged on the connecting block 7.1, and when the connecting block 7.1 is installed in the accommodating groove 11.1, the positioning lug 7.1.1 is matched in the positioning groove 11.2. In this embodiment, as shown in fig. 3, two positioning protrusions 7.1.1 are symmetrically disposed on the connecting block 7.1, and correspondingly, two positioning grooves 11.2 are also disposed, so that the positioning rotation-preventing performance is more stable.

In addition, in the bending device, the first limiting mechanism 13 comprises a first limiting seat 13.1, the first limiting seat 13.1 and the first piston 11 are fixedly connected through a plurality of first connecting rods 13.2, a first limiting groove 13.1.1 is arranged on the first limiting seat 13.1, and a first limiting groove 13.1.1 is assembled at the end of the heating pipe 100; the first limiting seat 13.1 is provided with a first through hole 13.1.2, and one end of the pull rod 7.2 far away from the connecting block 7.1 penetrates through the first limiting seat 13.1.

As shown in fig. 1 and 4, a first limiting boss 7.2.1 is provided at an end of the pull rod 7.2 close to the outer side surface of the first limiting seat 13.1, and when the pull rod 7.2 is spirally fitted on the connecting block 7.1 to the limiting position, the first limiting boss 7.2.1 is fitted on the outer side surface of the first limiting seat 13.1. Namely, the limit boss 7.2.1 is used for ensuring that the pull rod 7.2 is connected with the connecting block 7.1 in place. In the structure, in order to facilitate the rotation of the pull rod 7.2, a pull ring is arranged at the end part of the pull rod 7.2 penetrating out of one end of the first limiting seat 13.1, and the cover pull ring has a better force application point when rotating the pull rod 7.2. Of course, the tab structure can be replaced by other parts, and only the force application point can be increased.

The second limiting mechanism 14 comprises a second limiting seat 14.1, a plurality of second connecting rods 14.2 are arranged between the second limiting seat 14.1 and the second piston 12, one end of each second connecting rod 14.2 is connected with the second piston 12, the other end of each second connecting rod is arranged on the second limiting seat 14.1 in a sliding and penetrating mode, and one end, penetrating out of the second limiting seat 14.1, of each second connecting rod 14.2 is connected with a locking nut 14.3. One end of the second limiting seat 14.1, which is close to the heating tube 100, is also provided with a second limiting groove 14.1.1, after the installation is completed, the second limiting groove 14.1.1 is assembled at the end of the heating tube 100, and the second limiting seat 14.1 is also provided with a connecting hole for the pipeline 100 to pass through.

In addition, rollers 15 are arranged on one side of the mounting base plate 1 close to the movable die 3 and at positions corresponding to the two clamping rings 5, and the axes of the rollers 15 are vertical to the plane of the mounting base plate 1; the mounting base plate 1 is also provided with a limiting seat 16 for abutting against the end face of the clamping ring 5, and the limiting seat 16 is used for limiting the position of the whole heating pipe component provided with the piston, so that the bending position precision is improved.

Specifically, the installation process of the heating pipe 100, the two pistons and the limiting mechanism is as follows:

connecting one end of the chain 6 with a tripping mechanism with the first piston 11 to realize the connection of the first piston 11 and the second piston 12, then installing the first piston 11 and the second piston 12 into the heating tube 100, specifically, installing one end of the second piston 12 into the heating tube 100 in the direction, the first piston 11 extrudes the second piston 12, when the second piston 12 moves to one end of the second connecting rod 14.2 to extend out of the other end of the heating tube 100, installing the second limiting seat 14.1 on the end of the heating tube 100, making the end of the second connecting rod 14.2 penetrate into the second communicating hole 14.1.2 on the second limiting seat 14.1, installing the locking nut 14.3 on the end of the second connecting rod 14.2 penetrating out of the second limiting seat 14.1, under the pulling action of the threaded connection, the second connecting rod 14.2 continuously moves outwards, so that the second piston 12 continuously moves outwards until the first limiting groove 13.1.1 on the first limiting seat 13.1 is assembled and abutted against the end of the heating tube 100, the first piston 11 and the second piston 12 move to preset positions, and meanwhile, the chain 6 is in a straightening state, so that the installation and connection of the whole assembly are realized.

In this structure, as shown in fig. 5, in order to prevent the chain 6 from being deformed correspondingly when the lock nut 14.3 is continuously rotated after the first piston 11 and the second piston 12 reach the preset positions, so that the position of the second piston 12 is shifted, and the position accuracy after bending is affected, a corresponding second limit boss 14.2.1 is disposed at one end of the second connecting rod 14.2 close to the second limit seat 14.1, and when the first piston 11 and the second piston 12 reach the preset positions, the second limit boss 14.2.1 abuts against an end surface of the second limit seat 14.1, at this time, the lock nut 14.3 is continuously tightened, and the second connecting rod 14.2 does not move outwards continuously, so as to ensure the position accuracy of the second piston 12.

The bending method of the heating pipe specifically comprises the following steps:

a. connecting a first piston 11 and a second piston 12, installing the first piston and the second piston into a pre-bent heating pipe 100, and positioning a first limiting mechanism 13 and a second limiting mechanism 14; positioning and clamping two clamping rings 5, specifically, the distance D between the outer ends of the two clamping rings 5 and the inner side edge of the silk-screen part on the heating pipe 100 is 1-2cm (as shown in FIG. 1);

b. liquid is introduced into the sealing cavity 8 in the heating pipe 100 to provide hydraulic pressure, specifically, the hydraulic pressure can be oil pressure or water pressure, and the pressure inside the pipe body can be increased to prevent the defects of breakage and internal diameter reduction in the pipe bending process; when the hydraulic pressure reaches 100Mpa, the driving cylinder 4 drives the movable die 3 to push the heating pipe 100 to bend towards the static die 2, the hydraulic pressure in the sealing cavity 8 is gradually increased while the bending movement is carried out, the die closing process is 5-7s, and the maximum hydraulic pressure is not more than 400 Mpa; when the movable mold 3 moves towards the static mold 2 at a preset position, keeping the hydraulic pressure in the sealing cavity for 2-3 s;

c. after the pressure maintaining is completed, the hydraulic pressure is removed, and the first piston 11 and the second piston 12 are separated from the heating pipe 100.

As shown in fig. 6, it is a graph showing the die closing distance and the hydraulic pressure variation during the bending process of the heating pipe 100 according to the present invention.

In particular, the drawings are:

l is the distance between the movable mold and the static mold, and t0-t3 is the mold closing direction;

lmax is the initial distance between the moving mold and the static mold;

t0-t1- -the hydraulic pressure inside the sealed cavity is precharged for generally 5 s;

t1-t2- -the mold closing process, the hydraulic pressure increases linearly, generally 5-7 s;

t2-t3- -pressure maintenance, generally 2-3s

P1-precharge hydraulic pressure;

p2- -hydraulic pressure when mold clamping;

pmax- -the pipe bending pressure, generally 300 and 400MPa, and the maximum value is not more than 1000MPa, which depends on the radius and wall thickness of the bent pipe.

The pressure of P1 and P2 is a parameter obtained after continuous debugging in the development process of the production process. In this embodiment, preferably, P1-80-150 MPa, P2-190-350 MPa.

While the above is directed to the preferred embodiment of the present invention, it is not intended that it be limited, except as by the appended claims. The present invention is not limited to the above embodiments, and the specific structure thereof allows for changes, all the changes made within the protection scope of the independent claims of the present invention are within the protection scope of the present invention.

Claims (8)

1. The utility model provides a bending device of screen printing heating pipe, includes mounting plate (1), mounting plate (1) on be equipped with quiet mould (2), movable mould (3) and be used for driving movable mould (3) towards actuating cylinder (4) of quiet mould (2) motion, movable mould (3) on be equipped with arc recess (3.1), quiet mould (2) on be equipped with arc recess (3.1) assorted arc protruding (2.1), its characterized in that: the device also comprises two moving pistons which are assembled in the inner hole of the heating pipe (100) in a sliding way and two clamping rings (5) which are tightly pressed outside the heating pipe (100) and correspond to the two moving pistons one by one; a chain (6) is arranged between the two moving pistons, a tripping assembly (7) is arranged at one end or two ends of the chain (6), the tripping assembly (7) is connected with the corresponding moving piston, the two moving pistons are matched in the heating pipe (100) at intervals in a sealing manner so that a sealing cavity (8) is formed between the two moving pistons, a liquid inlet pipe (9) communicated with the sealing cavity (8) is arranged on the moving piston, and a pipeline (10) communicated with an external pump station is arranged at one end, away from the sealing cavity (8), of the liquid inlet pipe (9); and the two moving pistons are respectively provided with a limiting mechanism for limiting the preset position of the moving pistons in the heating pipe (100), and when the two limiting mechanisms are in limiting fit with the two ends of the heating pipe (100), the chain (6) is in a straightening state.

2. The bending device of the screen printing heating pipe according to claim 1, characterized in that: one end of the chain (6) is provided with a tripping component (7), a moving piston corresponding to the tripping component (7) is marked as a first piston (11), and the other moving piston is marked as a second piston (12); one end of the chain (6) is connected with a first piston (11) through a tripping component (7), and the other end of the chain is connected with a second piston (12); and the limit mechanism corresponding to the first piston (11) is marked as a first limit mechanism (13), and the limit mechanism corresponding to the second piston (12) is marked as a second limit mechanism (14).

3. The bending device of the screen printing heating pipe according to claim 2, characterized in that: the tripping assembly (7) comprises a connecting block (7.1), one end of the connecting block (7.1) is connected with the chain (6), and the other end of the connecting block is in sliding connection with the first piston (11); one end of the connecting block (7.1) deviating from the chain (6) is connected with a pull rod (7.2) in a threaded mode, and the other end of the pull rod (7.2) penetrates through the first piston (11) and extends to the first limiting mechanism (13).

4. The bending device of the screen printing heating pipe according to claim 3, characterized in that: an accommodating groove (11.1) is formed in the first piston (11), the connecting block (7.1) is in sliding fit in the accommodating groove (11.1), and a sealing ring is arranged between the connecting block (7.1) and the accommodating groove (11.1); the open end of storage tank (11.1) is equipped with constant head tank (11.2), be equipped with location lug (7.1.1) on connecting block (7.1), when connecting block (7.1) is installed in storage tank (11.1), location lug (7.1.1) cooperation in constant head tank (11.2).

5. The bending device of the screen printing heating pipe according to claim 3, characterized in that: the first limiting mechanism (13) comprises a first limiting seat (13.1), the first limiting seat (13.1) and the first piston (11) are fixedly connected through a plurality of first connecting rods (13.2), a first limiting groove (13.1.1) is formed in the first limiting seat (13.1), and the first limiting groove (13.1.1) is assembled at the end part of the heating pipe (100); first spacing seat (13.1) on be equipped with first through-hole (13.1.2), the one end that connecting block (7.1) were kept away from in pull rod (7.2) is worn to establish on first spacing seat (13.1).

6. The bending device of the screen printing heating pipe of claim 5, characterized in that: one end of the pull rod (7.2) close to the outer side face of the first limiting seat (13.1) is provided with a first limiting boss (7.2.1), and when the pull rod (7.2) is spirally matched on the connecting block (7.1) to an extreme position, the first limiting boss (7.2.1) is matched on the outer side face of the first limiting seat (13.1).

7. The bending device of the screen printing heating pipe according to claim 2 or 5, characterized in that: the second limiting mechanism (14) comprises a second limiting seat (14.1), a plurality of second connecting rods (14.2) are arranged between the second limiting seat (14.1) and the second piston (12), one end of each second connecting rod (14.2) is connected with the second piston (12), the other end of each second connecting rod penetrates through the second limiting seat (14.1) in a sliding mode, and one end, penetrating out of the second limiting seat (14.1), of each second connecting rod (14.2) is connected with a locking nut (14.3).

8. The bending device of the screen printing heating pipe according to claim 1, characterized in that: the installation bottom plate (1) is provided with rollers (15) at positions close to one side of the movable mold (3) and corresponding to the two clamping rings (5), and the axes of the rollers (15) are vertical to the installation bottom plate (1); the mounting base plate (1) is also provided with a limiting seat (16) for the end face of the clamping ring (5) to lean against.

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