Anti-jamming electric pipe expanding tool

Abstract

The utility model discloses an anti -stuck machine electric expansion pipe tool, including the casing and install the cam at the top of casing, the front end of casing is installed with the sleeve, and the front part of sleeve is installed with the expansion pipe mode, and the sleeve slidingly connects with the conical push rod, and the conical push rod moves forward and pushes the expansion pipe mode to open, and the tail portion of sleeve is equipped with the guide groove along the length direction, and the tail portion of conical push rod is equipped with two lug seats symmetrically, and the lug seat is installed with the through pin shaft, and the end of pin shaft is matched with the guide groove and is connected, and the middle part of pin shaft is installed with the gyro wheel that can rotate freely, and the gyro wheel is contacted with the outside of cam, and the conical push rod is retracted and resets by spring after stretching out, and the tail portion of conical push rod is equipped with the supplementary back -and -forth mechanism, and the supplementary back -and -forth mechanism follows the rotation of cam and is periodically intermittent action. On the basis of existing product, increase back -and -forth mechanism, increase safety redundancy, guarantee that conical push rod is back -and -forth smoothly, can satisfy the expansion pipe demand of big pipe diameter.

Description

Technical Field

[0001] This utility model relates to the field of pipe expanding tool technology, specifically to an anti-jamming electric pipe expanding tool. Background Technology

[0002] With the development of the new material PEAX in the heating and water supply market, more and more projects are using this material as water pipes. PEAX pipe connections typically use two main methods: quick-connect and slip-fit ​​connection. The quick-connect method utilizes the strong memory effect of the pipe material; after cold expansion using a pipe expander, the pipe fitting is inserted to complete the connection, significantly improving construction efficiency compared to the currently mature PPR pipe construction. In practical use, existing pipe expanders (the structure of which can be referenced in the invention patent with announcement number CN204773556U, which discloses a cross-linked polyethylene expansion tool) often experience limitations when expanding thicker pipes. Because the expansion range is limited each time, and the material of thicker pipes contracts faster, the pipe may press the expander head tightly against the conical push rod. In this case, the force required to spring the push rod back exceeds the spring's capacity, preventing normal return and causing the push rod to jam, thus preventing reciprocating movement. The usual solution to the above problem is to replace it with a spring with a larger wire diameter and stronger elasticity. However, this will consume more energy to compress the spring when pushing the push rod, which is equivalent to reducing the power of the motor acting on the push rod. This is not conducive to the normal expansion of the pipe and increases the risk of the expansion head getting stuck with the push rod. Utility Model Content

[0003] The purpose of this utility model is to provide an anti-jamming electric pipe expander tool to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, this utility model provides the following technical solution: an anti-jamming electric pipe expander tool, comprising a housing and a cam mounted on the top of the housing, a sleeve mounted at the front end of the housing, a pipe expander mold mounted at the front of the sleeve, a tapered push rod slidably connected to the sleeve, the tapered push rod moving forward to push the pipe expander mold open, a guide groove along the length direction provided at the tail end of the sleeve, two lugs symmetrically provided at the tail end of the tapered push rod, a through pin mounted on the lugs, the end of the pin fitting and engaging with the guide groove, a freely rotatable roller mounted in the middle of the pin, the roller contacting the outer side of the cam, the tapered push rod being pushed back to its original position by a spring after extension, an auxiliary pull-back mechanism provided at the tail end of the tapered push rod, the auxiliary pull-back mechanism periodically and intermittently operating following the rotation of the cam.

[0005] Preferably, the auxiliary pull-back mechanism includes two sets of connecting rods a and b, with an oblong hole at the tail of the connecting rod b. The outer end of the connecting rod a is movably connected to the oblong hole by a pin. The connecting rod a is fixedly installed with the spindle of the cam. The other end of the connecting rod b is hinged to the pin. The connecting rod a, connecting rod b, and tapered push rod constitute a crank-slider mechanism.

[0006] Preferably, the auxiliary pull-back mechanism is an annular belt connected between the roller and the cam. When the conical push rod is pushed to the front end and cannot be pulled back normally, the annular belt is tightened to apply a pull-back force to the conical push rod when the remote point of the cam rotates to the rear.

[0007] Compared with the prior art, the beneficial effects of this utility model are: It adds an auxiliary pull-back mechanism to the existing product. The auxiliary pull-back mechanism can be a crank-slider mechanism composed of connecting rod a, connecting rod b, and a tapered push rod, or it can be an annular belt connected between the roller and the cam. The auxiliary pull-back mechanism increases safety redundancy and ensures smooth pull-back of the tapered push rod, thereby meeting the needs of large-diameter pipe expansion. Attached Figure Description

[0008] Figure 1 This is a top view of the structure of this utility model;

[0009] Figure 2 This is a three-dimensional structural diagram of a tapered push rod.

[0010] In the diagram: 1. Housing; 2. Cam; 3. Tapered push rod; 4. Tube mold; 5. Sleeve; 6. Connecting rod a; 7. Connecting rod b; 8. Annular belt; 9. Pin; 10. Roller; 11. Oval hole. Detailed Implementation

[0011] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0012] Example 1

[0013] Please see Figure 1 , 2This utility model provides a technical solution: an anti-jamming electric pipe expander tool, including a housing 1 and a cam 2 installed on the top of the housing 1. A sleeve 5 is installed at the front end of the housing 1, and a pipe expander mold 4 is installed at the front part of the sleeve 5. A tapered push rod 3 is slidably connected to the sleeve 5. The tapered push rod 3 moves forward to push the pipe expander mold 4 to open. The tail end of the sleeve 5 is provided with a guide groove along the length direction. Two ear seats are symmetrically arranged at the tail end of the tapered push rod 3. A through pin 9 is installed on the ear seat. The end of the pin 9 is adapted to and engaged with the guide groove. The guide groove restricts the lateral movement of the pin 9. A freely rotatable roller 10 is installed in the middle of the pin 9. The roller 10 contacts the outer side of the cam 2. After the tapered push rod 3 extends, it is pushed back to its original position by a spring (the spring is not shown in the attached drawings, but its installation method has been disclosed in patent CN204773556U, which is prior art). An auxiliary pull-back mechanism is provided at the tail of the tapered push rod 3. The auxiliary pull-back mechanism includes two sets of connecting rods a6 and b7. The tail of the connecting rod b7 is provided with an oblong hole 11. The inner end of the connecting rod a6 is connected to the cam. The central shaft of cam 2 is installed, and the connecting rod a6 rotates synchronously with cam 2. The outer end of the connecting rod a6 is movably connected to the oblong hole 11 by a pin (the oblong hole 11 is set to ensure a non-rigid connection between the connecting rod a6 and the connecting rod b7). The other end of the connecting rod b7 is hinged to the pin shaft 9. The connecting rod a6, the connecting rod b7 and the tapered push rod 3 constitute a crank-slider mechanism. The crank-slider mechanism pulls and follows the rotation of cam 2. The crank-slider mechanism pushes and pulls the tapered push rod 3 back and forth, thus achieving auxiliary pull-back.

[0014] Example 2

[0015] Please see Figure 1 The difference between Implementation 2 and Implementation 1 is the specific structure of the auxiliary pull-back mechanism. The auxiliary pull-back mechanism is an annular belt 8, which is connected between the roller 10 and the cam 2. When the conical push rod 3 cannot be pulled back normally when pushed to the front end, the annular belt 8 tightens and applies a backward pull-back force to the conical push rod 3 when the remote point of the cam 2 rotates to the rear. (When the conical push rod 3 is not stuck and is pulled back normally, the annular belt 8 is always in a relaxed state, and the auxiliary conical push rod 3 is pulled back and moved backward.)

[0016] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An anti-jamming electric pipe expander tool, comprising a housing (1) and a cam (2) mounted on the top of the housing (1), a sleeve (5) is mounted on the front end of the housing (1), a pipe expander mold (4) is mounted on the front part of the sleeve (5), a tapered push rod (3) is slidably connected to the sleeve (5), the tapered push rod (3) moves forward to push the pipe expander mold (4) open, the tail end of the sleeve (5) is provided with a guide groove along the length direction, the tail end of the tapered push rod (3) is symmetrically provided with two lugs, the lugs are mounted with a through pin (9), the end of the pin (9) is adapted to and engaged with the guide groove, the middle part of the pin (9) is mounted with a freely rotatable roller (10), the roller (10) contacts the outer side of the cam (2), the tapered push rod (3) is pushed back to its original position by a spring after it extends, characterized in that: The tail of the tapered push rod (3) is provided with an auxiliary pull-back mechanism, which operates intermittently in accordance with the rotation of the cam (2).

2. The anti-jamming electric pipe expander tool according to claim 1, characterized in that: The auxiliary pull-back mechanism includes two sets of connecting rods a (6) and b (7). The tail of the connecting rod b (7) is provided with an oblong hole (11). The outer end of the connecting rod a (6) is movably connected to the oblong hole (11) by a pin. The connecting rod a (6) is fixedly installed with the spindle of the cam (2). The other end of the connecting rod b (7) is hinged to the pin shaft (9). The connecting rod a (6), the connecting rod b (7) and the tapered push rod (3) constitute a crank-slider mechanism.

3. The anti-jamming electric pipe expander tool according to claim 1, characterized in that: The auxiliary pull-back mechanism is an annular belt (8), which is connected between the roller (10) and the cam (2). When the tapered push rod (3) is pushed to the front end and cannot be pulled back normally, the annular belt (8) is tightened when the remote point of the cam (2) rotates to the rear to apply a pull-back force to the tapered push rod (3).

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