Fin machine guide rod following device and control method

Abstract

The invention discloses a fin machine guide rod following device and a control method, relates to the field of fin machines, and aims to solve the problems that in the prior art, a guide rod is pushed by a finished pipe to move, and a forming cutter is seriously abraded due to reverse thrust borne by the finished pipe. And a displacement detection mechanism is arranged between the inner rod connected with the guide head and the guide rod. The active traction mechanism is used for dragging the guide rod to actively move, so that the resistance of the guide rod and the guide head to a finished pipe is greatly reduced, and a forming cutter of the fin machine is protected. And the displacement detection mechanism can detect the change of the distance between the guide head and the guide rod, so that the PLC can adjust the moving speed of the guide rod in time, the moving speed of the guide rod tends to be the same as the moving speed of the finished pipe, and the guiding and supporting effects of the guide head on the finished pipe are maintained while the forming cutter of the fin machine is protected.

Description

Technical Field

[0001] The invention relates to the technical field of fin machines, and in particular to a guide rod following device and a control method of a fin machine. Background Art

[0002] When the fin machine is forming the tube, the tube to be processed is first pushed into the processing position of the fin machine through the guide rod. During the fin forming process, the tube gradually retreats. When retreating, the guide rod guides and supports the tube to prevent the tube from getting stuck and the tube head from vibrating. In the existing guide rod following device, the finished tube pushes the guide rod backward during the tube tooth forming process. The guide rod will produce a lot of resistance to the copper tube being processed, increasing the reverse thrust of the copper tube on the forming tool, thereby aggravating the tool wear. Summary of the invention

[0003] The technical problem to be solved by the present invention is to overcome the existing defects and provide a fin machine guide rod following device and a control method, which can effectively solve the problems in the background technology.

[0004] In order to achieve the above-mentioned purpose, the present invention first discloses a guide rod following device for a fin machine, and the technical solution adopted is that it includes a guide rod and a guide head, wherein the guide rod is connected to the guide head, the guide rod is a tubular structure, the guide head is connected to an inner rod, the inner rod is slidably connected in the guide rod, and a displacement detection mechanism is provided between the inner rod and the guide rod; it also includes an active traction mechanism and a PLC controller, wherein the active traction mechanism is connected to the guide rod, the PLC controller is electrically connected to the displacement detection mechanism and the active traction mechanism, and the PLC controller is also electrically connected to a host computer. The PLC controller controls the active traction mechanism to pull the guide rod to actively move, which can prevent the guide rod from forming a large resistance to the finished tube, thereby protecting the forming tool of the fin machine, and the displacement detection mechanism can detect the distance change between the guide rod and the guide head, thereby ensuring that the moving speed of the guide rod is consistent with the moving speed of the finished tube.

[0005] As a preferred technical solution of the present invention, the displacement detection mechanism includes a drawstring encoder, which is installed on the guide rod; a slide groove is provided on the side wall of the guide rod, a connecting seat is connected to the inner rod, the connecting seat passes through the slide groove and slides in the slide groove, and the drawstring in the drawstring encoder is connected to the connecting seat; the drawstring encoder is electrically connected to the PLC controller. When the distance between the guide rod and the guide head changes, the distance between the connecting seat and the drawstring encoder body will change accordingly, thereby causing the drawstring extension amount of the drawstring encoder to change, and the detection value of the drawstring encoder changes accordingly, so that the PLC controller can detect the change in the distance between the guide rod and the guide head in time and make a corresponding response.

[0006] The displacement detection mechanism may also use common devices such as distance sensors, displacement sensors, magnetostrictive displacement sensors, and sliding resistors that can convert distance changes into electrical signals.

[0007] As a preferred technical solution of the present invention, a spring is mounted on the inner rod, and the spring is located between the guide head and the guide rod. The spring can ensure that there is a gap between the guide head and the guide rod, so that the guide head maintains a floating state.

[0008] As a preferred technical solution of the present invention, the active traction mechanism includes a servo motor and a driven wheel, the output shaft of the servo motor is connected to a traction wheel, a steel wire traction rope is set between the traction wheel and the driven wheel, and the steel wire traction rope is connected to the guide rod; the PLC controller is electrically connected to a motor frequency converter, and the motor frequency converter is electrically connected to the servo motor. The traction wheel can drive the steel wire traction rope to move and then pull the guide rod to move.

[0009] The wire traction rope-traction wheel (and driven wheel) in the active traction mechanism can also be replaced by common linear displacement mechanisms such as synchronous belt-synchronous wheel, chain-sprocket, belt-pulley, screw slider system, etc.

[0010] The present invention also discloses a fin machine guide rod following control method based on the above device, and the adopted technical solution comprises the following steps: Step 1, the end of the pipe to be processed is put on the guide head, the PLC controller drives the active traction mechanism to pull the guide rod to move, and the guide rod pushes the guide head to send the pipe to be processed into the fin machine processing position; Step 2, during the finning machine processing the tube, the tube gradually retreats, pushing the guide head and the inner rod to move toward the guide rod, and the PLC controller drives the active traction mechanism to pull the guide rod to continuously move away from the guide head, so as to prevent the guide rod and the guide head from forming a large resistance to the tube; Step 3, the PLC controller detects the change in the distance between the guide rod and the guide head through the displacement detection mechanism. When the distance between the guide rod and the guide head gradually increases, the active traction mechanism is controlled to decelerate. When the distance between the guide rod and the guide head gradually decreases, the active traction mechanism is controlled to accelerate, so that the moving speed of the guide rod tends to be synchronized with the moving speed of the pipe until the forming of the pipe is completed.

[0011] As a preferred technical solution of the present invention, in step 1, the active traction mechanism is a servo motor driving the traction wheel, the guide rod is connected to a traction rope, the traction rope is mounted on the traction wheel and the driven wheel, the PLC controller transmits a signal to the motor inverter, the motor inverter controls the running direction and speed of the servo motor, and then the guide rod is moved by pulling the traction wheel and the traction rope.

[0012] As a preferred technical solution of the present invention, in step 3, the displacement detection mechanism adopts a drawstring encoder, the drawstring encoder body is on the guide rod, the drawstring rope end of the drawstring encoder is connected to the inner rod, and when the distance between the guide rod and the guide head changes, the detection value of the drawstring encoder will change accordingly, and the PLC controller obtains the change in the distance between the guide rod and the guide head by acquiring the change in the detection value of the drawstring encoder.

[0013] Compared with the prior art, the beneficial effects of the present invention are as follows: the present invention uses an active traction mechanism to pull the guide rod to actively move, thereby greatly reducing the resistance of the guide rod and the guide head to the finished pipe, and protecting the forming tool of the fin machine. The displacement detection mechanism can detect the change in the distance between the guide head and the guide rod, so that the PLC controller can adjust the moving speed of the guide rod in time, so that the moving speed of the guide rod is similar to the moving speed of the finished pipe, thereby protecting the forming tool of the fin machine while maintaining the guiding and supporting effect of the guide head on the finished pipe.

[0014] Furthermore, by arranging a spring between the guide head and the guide rod, the guide head can be kept in a floating state while supporting the finished pipe, thereby maintaining a high supporting effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the structure of the present invention; Figure 2 It is a structural schematic diagram of the connecting part between the guide rod and the guide head of the present invention; Figure 3 It is a schematic diagram of the top view of the connecting part between the guide rod and the guide head of the present invention; Figure 4 It is the AA cross-sectional view of the present invention.

[0016] In the figure: 1, guide rod; 101, slide groove; 2, inner rod; 3, guide head; 4, connecting seat; 5, pull rope; 6, pull rope encoder; 7, spring; 8, servo motor; 9, traction rope; 10, traction wheel; 11, driven wheel. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. Example 1

[0018] like Figures 1 to 4As shown, the present invention first discloses a fin machine guide rod following device, and the technical solution adopted is, including a guide rod 1 and a guide head 3, the guide rod 1 is a tubular structure with an open end, the guide head 3 is a truncated cone, and its large diameter end face is connected to the inner rod 2, the inner rod 2 slides in the guide rod 1, and is in sliding contact with the inner wall of the guide rod 1.

[0019] In order to actively pull the guide rod 1 and prevent it from forming a large reverse thrust on the finished tube and causing wear of the fin machine forming blade, two traction plates are set on the guide rod 1. The two traction plates are respectively connected to the two ends of the same traction rope 9. The traction rope 9 is a steel wire rope, which is mounted on the traction wheel 10 and the driven wheel 11. The traction wheel 10 and the driven wheel 11 are connected to the frame. The servo motor 8 is also installed on the frame. The traction wheel 10 is keyed to the output shaft of the servo motor 8.

[0020] In order to accurately control the traction speed of the guide rod 1 and timely detect the position change between the guide rod 1 and the guide head 3, so as to prevent the guide head 3 from forming a large resistance to the finished pipe or losing the guiding and supporting effect on the finished pipe, an extension rod is connected to the end face of the inner rod 2, and a connecting seat 4 is connected to the extension rod. A slide groove 101 is provided on the side wall of the guide rod 1, and the connecting seat 4 passes through the slide groove 101 and is slidably connected in the slide groove 101. A pull rope encoder 6 is installed on the guide rod 1, and the rope end of the pull rope 5 of the pull rope encoder 6 is connected to the connecting seat 4.

[0021] In order to realize automatic adjustment of the speed of the guide rod 1, the servo motor 8 is electrically connected to the motor frequency converter, the motor frequency converter and the cable encoder 6 are electrically connected to the PLC controller, and the PLC controller is also electrically connected to the host computer.

[0022] In order to leave a gap between the guide head 3 and the guide rod 1, maintain the floating state of the guide head 3, and enable the guide head 3 to provide stable guidance and support for the finished pipe, an edge plate is provided on the large diameter end face of the guide head 3, and a spring 7 is pressed between the edge plate and the guide rod 1, and the spring 7 is sleeved on the inner rod 2.

[0023] The present invention also discloses a control method for the fin machine guide rod following device, and the technical solution adopted is, comprising the following steps: Step 1, put the end of the pipe to be processed on the loading rack on the guide head 3, set the loading speed and unloading speed on the host computer, start the control program, the PLC controller sends a signal to the motor inverter, the motor inverter controls the servo motor 8 to run, controls the traction wheel 10 to rotate, the traction wheel 10 drives the traction rope 9 to pull the guide rod 1 to move, and the guide rod 1 pushes the guide head 3 to send the pipe to be processed into the fin machine processing position; Step 2, when the forming tool of the fin machine forms the pipe, the processed part gradually retreats away from the processing position, and the port of the finished pipe part is again put on the guide head 3 and moves in the direction of the guide rod 1. The guide head 3 guides and supports the finished pipe, and the PLC controller sends a signal to the motor inverter to control the servo motor 8 to run in the reverse direction according to the set feeding speed, and pulls the guide rod 1 to move away from the finished pipe to avoid the formation of reverse thrust on the finished pipe; Step 3, the PLC controller continuously monitors the detection value of the draw wire encoder 6. When the detection value continuously decreases to exceed the set error range, it indicates that the distance between the guide rod 1 and the guide head 3 is continuously decreasing, and it is determined that the traction speed of the guide rod 1 is slow. Then the PLC controller sends a signal to the motor frequency converter to increase the rotation speed of the servo motor 8 until the distance between the guide rod 1 and the guide head 3 can be maintained stable. At this time, it indicates that the guide rod 1 and the guide head 3 move at the same speed; when the detection value of the draw wire encoder 6 continuously increases to exceed the set error range, it indicates that the distance between the guide rod 1 and the guide head 3 is continuously increasing. It is determined that the traction speed of the guide rod 1 is fast. Then the PLC controller sends a signal to the motor frequency converter to reduce the rotation speed of the servo motor 8 until the distance between the guide rod 1 and the guide head 3 can be maintained stable; Step 4: After the finished tube completely leaves the finning machine and the tube processing is completed, stop the operation of the guide rod following device.

[0024] In this embodiment, a photoelectric sensor electrically connected to the PLC controller is installed at the processing position, and the photoelectric sensor is used to detect the pipe to determine the position state of the pipe. When the PLC controller detects the copper pipe signal through the photoelectric sensor, it means that the copper pipe begins to enter the processing position, and then the copper pipe signal is continuously obtained. When the copper pipe signal is lost through the photoelectric sensor, it means that the pipe processing is completed, and the operation of the guide rod following device is stopped.

[0025] The circuits and mechanical connections involved in the present invention are conventional means used by those skilled in the art, and technical inspiration can be obtained through a limited number of experiments, which are common knowledge.

[0026] Components not described in detail herein are prior art.

[0027] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A guide rod following device for a fin machine, comprising a guide rod (1) and a guide head (3), wherein the guide rod (1) and the guide head (3) are connected, and characterized in that: The guide rod (1) is a tubular structure, the guide head (3) is connected to an inner rod (2), the inner rod (2) is slidably connected in the guide rod (1), and a displacement detection mechanism is provided between the inner rod (2) and the guide rod (1); and the system further comprises an active traction mechanism and a PLC controller, the active traction mechanism being connected to the guide rod (1), the PLC controller being electrically connected to the displacement detection mechanism and the active traction mechanism, and the PLC controller being also electrically connected to a host computer.

2. The fin machine guide rod following device according to claim 1, characterized in that: The displacement detection mechanism comprises a drawstring encoder (6), the drawstring encoder (6) being mounted on the guide rod (1); a slide groove (101) is provided on a side wall of the guide rod (1); a connecting seat (4) is connected to the inner rod (2); the connecting seat (4) extends out of the slide groove (101) and slides in the slide groove (101); a drawstring (5) in the drawstring encoder (6) is connected to the connecting seat (4); the drawstring encoder (6) is electrically connected to the PLC controller.

3. The fin machine guide rod following device according to claim 1 or 2, characterized in that: A spring (7) is sleeved on the inner rod (2), and the spring (7) is located between the guide head (3) and the guide rod (1).

4. The fin machine guide rod following device according to claim 1, characterized in that: The active traction mechanism comprises a servo motor (8) and a driven wheel (11); the output shaft of the servo motor (8) is connected to a traction wheel (10); a traction rope (9) is sleeved between the traction wheel (10) and the driven wheel (11); the traction rope (9) is connected to the guide rod (1); the PLC controller is electrically connected to a motor frequency converter, and the motor frequency converter is electrically connected to the servo motor (8).

5. A control method based on the fin machine guide rod following device according to claim 1, characterized in that: The following steps are involved: Step 1, the end of the pipe to be processed is put on the guide head (3), the PLC controller drives the active traction mechanism to pull the guide rod (1) to move, and the guide rod (1) pushes the guide head (3) to send the pipe to be processed into the fin machine processing position; Step 2, during the finning machine processing the tube, the tube gradually retreats, pushing the guide head (3) and the inner rod (2) to move in the direction of the guide rod (1), and the PLC controller drives the active traction mechanism to pull the guide rod (1) to continuously move in a direction away from the guide head (3); Step 3, the PLC controller detects the change in the distance between the guide rod (1) and the guide head (3) through the displacement detection mechanism. When the distance between the guide rod (1) and the guide head (3) gradually increases, the active traction mechanism is controlled to decelerate. When the distance between the guide rod (1) and the guide head (3) gradually decreases, the active traction mechanism is controlled to accelerate until the forming of the pipe is completed.

6. The fin machine guide rod following control method according to claim 5, characterized in that: In the step 1, the active traction mechanism is a servo motor (8) driving a traction wheel (10), the guide rod (1) is connected to a traction rope (9), the traction rope (9) is sleeved on the traction wheel (10) and the driven wheel (11), the PLC controller transmits a signal to the motor frequency converter, the motor frequency converter controls the running direction and speed of the servo motor (8), and then the guide rod (1) is pulled to move by the traction wheel (10) and the traction rope (9).

7. The fin machine guide rod following control method according to claim 1, characterized in that: In step 3, the displacement detection mechanism uses a drawstring encoder (6), the main body of the drawstring encoder (6) is on the guide rod (1), and the end of the drawstring rope (5) of the drawstring encoder (6) is connected to the inner rod (2). When the distance between the guide rod (1) and the guide head (3) changes, the detection value of the drawstring encoder (6) will change accordingly. The PLC controller obtains the change in the distance between the guide rod (1) and the guide head (3) by acquiring the change in the detection value of the drawstring encoder (6).

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