CN109435254B

CN109435254B - Plastic pipe welding device

Info

Publication number: CN109435254B
Application number: CN201811349027.6A
Authority: CN
Inventors: 何建兴; 周爱军; 陈慈香; 闫超; 齐晓颖; 岳红辉; 何峰; 孟柏锋
Original assignee: Guangzhou Fengye Pipe Industry Co ltd
Current assignee: Guangzhou Fengye Pipe Industry Co ltd
Priority date: 2018-11-13
Filing date: 2018-11-13
Publication date: 2020-10-27
Anticipated expiration: 2038-11-13
Also published as: CN109435254A

Abstract

The invention discloses a plastic pipe welding device which comprises a welding table and a hot melting device, wherein the hot melting device comprises an external fixed guide ring, a telescopic device, an internal fixed guide ring, an external heating rod and an internal heating rod, the internal fixed guide ring is connected with the telescopic end of the telescopic device, and the telescopic end of the telescopic device can extend and move to drive the internal fixed guide ring to move from the end part of an inner cavity of one plastic pipe to be welded to an inner cavity of an interface. The built-in heating rod is in sliding fit with the built-in fixed guide ring, and the end part of the built-in heating rod can be contacted with an inner seam at the interface. The external heating rod is in sliding fit with the external fixed guide ring, and the end part of the external heating rod can be in contact with the external seam at the joint. The invention has the advantages of realizing that the inner side and the outer side of the interface of two plastic pipes to be welded synchronously adopt the moving type circulating spot welding, ensuring the welding strength and reducing the continuous contact area between the softened plastic pipes and the heating element.

Description

Plastic pipe welding device

Technical Field

The invention relates to the technical field of plastic pipes, in particular to a plastic pipe welding device.

Background

Plastic welding refers to a joining method in which two plastic parts are joined into a single body by simultaneously melting the contact surfaces of the two plastic parts by heating.

The prior art plastic welding techniques include hot plate welding, hot air welding, hot bar and pulse welding, etc.

The hot plate welding is to melt and soften two planes to be welded by a plane electric heating plate, then quickly remove the electric heating plate, combine the two planes and apply force to the two planes for cooling. The hot air welding means that when hot air flow is directly blown to a joint area, filler wires which are made of the same material as the base metal in the joint area are melted. The two techniques of hot bar and pulse welding are mainly used for welding the plastic films with smaller thickness.

The plastic pipe socket welding device disclosed in the chinese patent application CN105150523A is characterized in that heating elements are respectively arranged inside and outside the interfaces of two plastics, and when the device works, the heating elements are switched on to realize synchronous welding inside and outside the interfaces of the two plastics. This technical scheme adopts be whole welding, and the contact between heating element and the interface is the face contact promptly, and heating element is often in quiescent condition at the during operation, so, the body after the melting can adhere on heating element, and is difficult for clearing up, has long formed impurity and has influenced adhesion strength.

The plastic pipe hot-melting welding machine for home decoration disclosed in the chinese patent application CN207128280U, although this technical scheme is provided with the temperature sensor and the warning alarm device on the hot-melting device, the temperature sensor is heating or heating is completed through red green light emitting diode display, the timing device is provided, the completion of the fusion time is reminded through the alarm device, thereby reminding the separation of the fused pipe body and the hot-melting device in real time, and reducing the occurrence of adhesion phenomenon. However, the problems associated with surface contact are still not completely solved and the requirements for achieving operation are demanding.

Disclosure of Invention

Aiming at the defects of the prior art, the invention provides the plastic pipe welding device which can realize that the inner side and the outer side of the interface of two plastic pipes to be welded synchronously adopt the moving type circulating spot welding, ensure the welding strength and reduce the continuous contact area between the softened plastic pipes and the heating element.

The invention solves the technical problems through the following technical means: a plastic pipe welding device comprises a welding table and a hot melting device, wherein after two plastic pipes to be welded are involuted on the welding table, the joint of the two plastic pipes to be welded is welded through the hot melting device; the hot melting device comprises an external fixed guide ring, a telescopic device, an internal fixed guide ring, an external heating rod and an internal heating rod, wherein the internal fixed guide ring is connected with a telescopic end of the telescopic device, and the telescopic end of the telescopic device can move the internal fixed guide ring from the end part of the internal cavity of one of the plastic pipes to be welded to an inner cavity of the joint and ensure that the internal fixed guide ring is concentric with the joint;

the built-in heating rod is in sliding fit with the built-in fixed guide ring, and the end part of the built-in heating rod can be contacted with an inner seam at the interface; the external fixed guide ring is arranged on the periphery of the interface and is concentric with the interface;

the external heating rod is in sliding fit with the external fixed guide ring, and the end part of the external heating rod can be in contact with the outer seam of the connector.

Preferably, the welding table comprises a first half bearing table and a second half bearing table which are arranged oppositely, and an opening of each half bearing table faces upwards.

Preferably, the end of all the heating rods contacting the interface has a trapezoidal structure.

Preferably, the built-in fixed guide ring is fixed at the telescopic end of the telescopic device through a reinforcing rib; the middle area of the built-in fixed guide ring is sunken, so that the section of the built-in fixed guide ring forms a U-shaped or V-shaped structure; two sides of the sunken area of the built-in fixed guide ring are provided with annular through grooves; the two sides of the inner end of the built-in heating rod are respectively arranged in the corresponding annular through grooves in a sliding fit mode, and the outer end of the built-in heating rod can be in contact with the inner seam at the interface; the telescopic end of the telescopic device is also rotatably connected with a first gear, the edge of the first gear is connected with the built-in heating rod through a connecting rod, and the first gear drives the first gear to rotate through a driving mechanism.

Preferably, the driving mechanism comprises a second gear and a driving motor, and the second gear is meshed with the first gear and is driven to rotate by the driving motor.

Preferably, the external fixed guide ring is provided with an annular track, and the external heating rod is in sliding fit with the external fixed guide ring through an electric sports car; the rollers of the electric sports car are limited in the annular track.

Preferably, clamping cylinders are arranged on two sides of the welding table, and the clamping cylinders on different sides move oppositely to clamp two plastic pipes to be welded.

Preferably, a first conductor electrically connected with the built-in heating rod is in contact with the first carbon brush, and a second conductor electrically connected with the built-in heating rod is in contact with the second carbon brush.

Preferably, the number of the built-in heating rods is multiple, and the built-in heating rods are distributed in an annular structure.

According to the invention, two plastic pipes to be welded are firstly oppositely connected in a terminating way, the terminating connection area is an interface, the external fixed guide ring is sleeved outside the periphery of the interface, and the external heating rod is in contact with an external seam at the interface. Then the telescopic device of the invention is started, the telescopic end of the telescopic device extends to drive the built-in fixed guide ring to extend into the inner cavity of the interface, and at the moment, the built-in heating rod is contacted with the inner seam of the interface. The built-in heating rod and the external heating rod are started simultaneously, the built-in heating rod and the external heating rod rotate around the built-in fixed guide ring and the external fixed guide ring respectively, continuous heat generation of the built-in heating rod and the external heating rod is applied to the inner joint and the outer joint of the joint respectively, softening of the joint is achieved gradually, heat synthesis molding of the two plastic pipes is achieved, and after cooling, the welding process is completed.

The invention has the advantages that: firstly, the built-in fixed guide ring and the external fixed guide ring are used as tracks to realize the annular motion of the built-in heating rod and the external heating rod, so that the contact area between the heating element and the interface is greatly reduced on the premise of ensuring the full hot melting of the inner side and the outer side of the interface, and the phenomenon of large-area adhesion of the heating element after the hot melting is avoided; secondly, the positioning function of the built-in fixed guide ring and the external fixed guide ring is utilized to ensure the accuracy of the action position of the target position in the rotating process of the built-in heating rod and the external heating rod, so that the offset of the heating rod is effectively prevented, and the welding accuracy is influenced; thirdly, the inner side and the outer side of the interface can be synchronously welded, and the technical problem that the inner side of the interface is difficult to weld and position is solved through the matching of the telescopic device and the built-in fixed guide ring. The telescopic device of the invention is preferably one of an air cylinder, an oil cylinder or an electric push rod.

Furthermore, the built-in heating rod is in sliding fit with the built-in fixed guide ring, and the end part of the built-in heating rod can be contacted with an inner joint at the interface. The external fixed guide ring is arranged on the periphery of the interface and is concentric with the interface.

Furthermore, two plastic pipes to be welded can be respectively placed into the corresponding Haff bearing tables from top to bottom, and a certain limiting effect is achieved by utilizing the arc cavity structure of the Haff bearing tables.

Furthermore, for two pipes connected in a socket joint, the inner side and the outer side of the interface of the first pipe body and the second pipe body are both of a step structure.

Furthermore, the built-in heating rod rotates around the built-in fixed guide ring by driving the motor to rotate and driving the second gear to rotate, so that the first gear meshed with the second gear is driven to rotate, the connecting rod is further rotated, and the built-in heating rod rotates around the built-in fixed guide ring. The mode of driving the built-in heating rod to rotate has the advantages of simple operation and high matching precision. Compared with the method that the electric sports car is directly arranged on the built-in fixed guide ring, the mechanical stability of the electric sports car is stronger, and the built-in structure is inconvenient for direct observation in work, so that the built-in electric sports car cannot be used for online monitoring.

Furthermore, when the plastic pipe welding machine works, the clamping cylinders on different sides are started to oppositely extend to clamp two plastic pipes to be welded by starting the clamping cylinders, so that the positioning stability of the plastic pipes is improved, and the plastic pipes are effectively prevented from being subjected to external force to deviate in position in the welding process.

Furthermore, the heating rods are heated by adopting an external power supply mode, and the problem of conductor entanglement caused by rotation of the heating rods is solved by adopting a carbon brush matching mode. Compared with a heating rod with an electric storage device, the invention can meet the welding among various power consumption load pipe bodies and is not limited by the electric storage capacity.

Further, the present invention preferably imposes welding strength to the inside of the pipe body. The number of the built-in heating rods is a plurality, and the built-in heating rods are distributed in an annular structure. And then improve the welding position, improve welding efficiency.

Drawings

Fig. 1 is a schematic structural diagram of a plastic pipe welding apparatus according to the present invention in a top view.

FIG. 2 is an enlarged view of a portion of FIG. 1 of the present invention.

Fig. 3 is a schematic structural view of a plastic pipe welding apparatus according to the present invention from an end view.

Fig. 4 is a schematic side view of a plastic pipe welding apparatus according to the present invention.

Fig. 5 is a schematic structural view of a built-in fixing guide ring in a plastic pipe welding apparatus according to the present invention.

Fig. 6 is a schematic structural view of a first pipe and a second pipe in socket welding state in a plastic pipe welding apparatus according to the present invention.

Fig. 7 is a schematic structural view of each fixed guide ring in a plastic pipe welding apparatus according to the present invention in a working state.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.

Example 1

As shown in fig. 1 and 2, the embodiment discloses a plastic pipe welding device, which includes a welding table 1 and a hot melting device, wherein after two plastic pipes to be welded are involuted on the welding table 1, the joints of the two plastic pipes to be welded are welded through the hot melting device. The hot melting device comprises an external fixed guide ring 21, a telescopic device 22, an internal fixed guide ring 23, an external heating rod 24 and an internal heating rod 25, wherein the internal fixed guide ring 23 is connected with the telescopic end of the telescopic device 22, and the telescopic end of the telescopic device 22 can extend and move to drive the internal fixed guide ring 23 to move to an inner cavity of a joint from the end part of an inner cavity of one of the plastic pipes to be welded and ensure that the internal fixed guide ring 23 is concentric with the joint.

The built-in heating rod 25 is in sliding fit with the built-in fixed guide ring 23, and the end part of the built-in heating rod 25 can be contacted with an inner seam at the interface.

As shown in fig. 3 and 4, an outer stationary guide ring 21 is disposed peripherally and concentrically at the interface. The external heating rod 24 is in sliding fit with the external fixed guide ring 21, and the end part of the external heating rod 24 can be contacted with an external seam at the interface.

According to the invention, two plastic pipes to be welded are firstly oppositely connected in a terminating way, the terminating connection area is an interface, the external fixed guide ring 21 is ensured to be sleeved outside the periphery of the interface, and the external heating rod 24 is contacted with an external seam at the interface. Then, the telescopic device 22 of the present invention is started, the telescopic end of the telescopic device 22 extends to drive the built-in fixed guide ring 23 to extend into the inner cavity of the interface, and at this time, the built-in heating rod 25 is in contact with the inner seam of the interface. And simultaneously starting the built-in heating rod 25 and the external heating rod 24, wherein the built-in heating rod 25 and the external heating rod 24 rotate around the built-in fixed guide ring 23 and the external fixed guide ring 21 respectively, and the built-in heating rod 25 and the external heating rod 24 continuously generate heat to act on an inner joint and an outer joint of the interface respectively, so that the interface is softened gradually, two plastic pipes are subjected to thermal synthesis molding, and after cooling, the welding process is completed.

The invention has the advantages that: firstly, the internal fixed guide ring 23 and the external fixed guide ring 21 are used as tracks to realize the annular movement of the internal heating rod 25 and the external heating rod 24, so that the contact area between the heating element and the interface is greatly reduced on the premise of ensuring the full hot melting of the inner side and the outer side of the interface, and the phenomenon of large-area adhesion of the heating element after the hot melting is avoided; secondly, the positioning function of the built-in fixed guide ring 23 and the external fixed guide ring 21 is utilized to ensure the accuracy of the action position of the target position in the rotating process of the built-in heating rod 25 and the external heating rod 24, so that the deviation of the heating rods is effectively prevented, and the welding accuracy is influenced; thirdly, the invention can realize the synchronous welding of the inner side and the outer side of the interface, and solves the technical problem of difficult positioning of the welding of the inner side of the interface by matching the telescopic device 22 with the built-in fixed guide ring 23. The extension device 22 of the present invention is preferably one of a cylinder, or an electric push rod.

Example 2

As shown in fig. 1, the welding table 1 includes a first half bearing table 11 and a second half bearing table 12 which are arranged oppositely, and an opening of each half bearing table faces upward.

Therefore, two plastic pipes to be welded can be respectively placed into the corresponding Haff bearing tables from top to bottom, and a certain limiting effect is achieved by utilizing the arc cavity structure of the Haff bearing tables.

Example 3

As shown in fig. 6, the end of all the heating rods contacting the interface has a trapezoidal structure.

For two pipes connected in a socket joint, the inner side and the outer side of the interface of the first pipe body 31 and the second pipe body 32 are both of a step structure.

Example 4

The built-in fixed guide ring 23 is fixed at the telescopic end of the telescopic device 22 through a reinforcing rib.

As shown in fig. 5, the built-in stationary guide ring 23 is recessed in its middle region so that the built-in stationary guide ring 23 has a U-shaped or V-shaped cross section. Annular through grooves 231 are formed at both sides of the recessed area of the built-in fixed guide ring 23. The two sides of the inner end of the built-in heating rod 25 are respectively arranged in the corresponding annular through grooves 231 in a sliding fit mode, and the outer end of the built-in heating rod 25 can be contacted with the interface. The telescopic end of the telescopic device 22 is also rotatably connected with a first gear 25 through a bearing, the edge of the first gear 25 is connected with the built-in heating rod 25 through a connecting rod 26, and the first gear 25 drives the first gear to rotate through a driving mechanism.

As shown in fig. 1 and 2, the driving mechanism preferably includes a second gear 271 and a driving motor 272, wherein the second gear 271 is meshed with the first gear 25 and is driven to rotate by the driving motor 272.

As shown in fig. 1 and 2, the driving motor 272 rotates to drive the second gear 271 to rotate, so as to drive the first gear 25 engaged with the second gear 271 to rotate, thereby realizing the rotation of the connecting rod 26, and further realizing the rotation of the built-in heating rod 25 around the built-in fixed guide ring 23. The mode of driving the built-in heating rod 25 to rotate has the advantages of simple operation and high matching precision. Compared with the method of directly arranging the electric sports car on the built-in fixed guide ring 23, the mechanical stability of the invention is stronger, and the built-in structure is inconvenient for direct observation in work, so that the built-in electric sports car cannot be used for online monitoring.

In some embodiments, the external fixed guide ring 21 is provided with an annular track (not shown), and the external heating rod 24 is slidably engaged with the external fixed guide ring 21 via an electric sports car. The rollers of the electric sports car are limited in the annular track.

In some embodiments, as shown in fig. 1, clamping cylinders 5 are provided on both sides of the welding station 1, the clamping cylinders 5 on different sides being moved towards each other for clamping two plastic pipes to be welded.

When the device works, the clamping cylinders 5 on different sides are started to enable the clamping cylinders 5 to extend oppositely to clamp two plastic pipes to be welded, so that the positioning stability of the plastic pipes is improved, and the plastic pipes are effectively prevented from being subjected to external force and being shifted in position in the welding process.

Example 5

As shown in fig. 7, a first conductor 61 electrically connected to the built-in heating rod 25 is in contact with a first carbon brush 62, and a second conductor 63 electrically connected to the built-in heating rod 25 is in contact with a second carbon brush 64.

The first conductor 61 of the present invention may be a cable, a plurality of cables are interlaced with each other and penetrate through the first gear teeth, and then contact the first carbon brush 62, and the first carbon brush 62 is externally connected to a power source. The second conductor 63 may have a bent structure, and the end surface of the bent portion of the second conductor is close to the center line of the external fixed guide ring 21.

The heating rod is heated by adopting an external power supply mode, and the problem of conductor entanglement caused by rotation of the heating rod is solved by adopting a carbon brush matching mode. Compared with a heating rod with an electric storage device, the invention can meet the welding among various power consumption load pipe bodies and is not limited by the electric storage capacity.

In some embodiments, the present invention preferably imposes weld strength on the inside of the tube body in order to ensure that the welded tube body has an outer surface that is as smooth as possible, and more so that the overall effect is imparted to the tube body, since the inside weld does not affect the outer integrity, smoothness of the tube body. The number of the built-in heating rods 25 is a plurality, and the built-in heating rods are distributed in an annular structure. And then improve the welding position, improve welding efficiency.

It is noted that, in this document, relational terms such as first and second, and the like, if any, are 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.

The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims

1. A plastic pipe welding device comprises a welding table and a hot melting device, wherein after two plastic pipes to be welded are involuted on the welding table, the joint of the two plastic pipes to be welded is welded through the hot melting device; the hot melting device is characterized by comprising an external fixed guide ring, a telescopic device, an internal fixed guide ring, an external heating rod and an internal heating rod, wherein the internal fixed guide ring is connected with a telescopic end of the telescopic device, and the telescopic end of the telescopic device can move to an inner cavity of the joint from the end part of an inner cavity of one of the plastic pipes to be welded to the inner cavity of the joint by the driving of the telescopic end of the telescopic device and ensure that the internal fixed guide ring and the joint are concentric;

2. A plastics pipe welding apparatus according to claim 1, wherein the welding station comprises first and second opposed half stations, each half station having an opening facing upwardly.

3. A plastic pipe welding apparatus according to claim 1, wherein an end portion of one of all the heating rods which is in contact with the interface has a trapezoidal configuration.

4. A plastic pipe welding apparatus according to claim 1, wherein said built-in stationary guide ring is fixed to the telescopic end of said telescopic means by means of reinforcing ribs; the middle area of the built-in fixed guide ring is sunken, so that the section of the built-in fixed guide ring forms a U-shaped or V-shaped structure; two sides of the sunken area of the built-in fixed guide ring are provided with annular through grooves; the two sides of the inner end of the built-in heating rod are respectively arranged in the corresponding annular through grooves in a sliding fit mode, and the outer end of the built-in heating rod can be in contact with the inner seam at the interface; the telescopic end of the telescopic device is also rotatably connected with a first gear, the edge of the first gear is connected with the built-in heating rod through a connecting rod, and the first gear drives the first gear to rotate through a driving mechanism.

5. A plastic pipe welding apparatus according to claim 4, wherein said drive mechanism comprises a second gear wheel, a drive motor, said second gear wheel being in mesh with said first gear wheel and being driven in rotation by said drive motor.

6. A plastic pipe welding device according to claim 1, wherein an annular track is provided on the external fixed guide ring, and the external heating rod is slidably fitted with the external fixed guide ring through an electric sports car; the rollers of the electric sports car are limited in the annular track.

7. A plastic pipe welding apparatus according to claim 1, wherein clamping cylinders are provided on both sides of the welding station, the clamping cylinders on different sides being moved towards each other for clamping two plastic pipes to be welded.

8. A plastic tube welding apparatus according to claim 1, wherein a first conductor electrically connected to the built-in heating rod is in contact with a first carbon brush, and a second conductor electrically connected to the built-in heating rod is in contact with a second carbon brush.

9. A plastic pipe welding apparatus according to claim 1, wherein said built-in heating rods are plural in number and distributed in a ring-shaped configuration.

10. A hot melting device for welding a plastic pipe is characterized by comprising an external fixed guide ring, a telescopic device, an internal fixed guide ring, an external heating rod and an internal heating rod, wherein the internal fixed guide ring is connected with a telescopic end of the telescopic device; the built-in heating rod is in sliding fit with the built-in fixed guide ring, and the end part of the built-in heating rod can be contacted with the interface; the external fixed guide ring is arranged on the periphery of the interface and is concentric with the interface; the built-in heating rod is in sliding fit with the external fixed guide ring, and the end part of the external heating rod can be contacted with the interface.