Refrigerator condenser tube straightening and cutting device

Abstract

The application discloses a refrigerator condenser pipe straightening and cutting device and belongs to the field of pipe processing equipment. Mainly including a machine table, and a pay-off rack, a straightening assembly, a feeding assembly, a clamping assembly and a rotary cutting assembly which are sequentially arranged on the machine table along the conveying direction; the rotary cutting assembly comprises a rotary cutting main disc and a wedge-shaped sleeve which is sleeved on the outer periphery of the rotary cutting main disc and has a tapered inner wall, and four groups of push units are distributed in a cross shape on the end face of the main disc. The refrigerator condenser pipe straightening and cutting device of the application is characterized in that the distance between the push unit with the auxiliary compression wheel installed on the inner side and the tapered surface is smaller than the distance between the push unit with the rotary cutting blade installed on the outer side, so that when the wedge-shaped sleeve moves axially, the auxiliary compression wheel can be preferentially driven to tightly hold the condenser pipe to realize rigid centering, and then the rotary cutting blade and the secondary compression wheel are driven to cut the pipe. This step-by-step time sequence action effectively eliminates the mechanical vibration in the instant of cutting, solves the problems of pipe cutting beveling and compression deformation, and improves the forming quality of the condenser pipe.

Description

Technical Field

[0001] This invention relates to the field of pipe processing equipment technology, and in particular to a device for straightening and cutting condenser tubes for freezers. Background Technology

[0002] Refrigerator condenser coils typically use thin-walled, soft copper or Bundy tubing as raw materials. The manufacturing process mainly includes coil unwinding, multi-stage roller straightening, and fixed-length cutting. To prevent metal shavings from entering the tubes and causing blockages, the industry widely employs a rotary chip-free cutting process. Existing chip-free rotary cutting devices usually contain a hollow rotating spindle with a cutting head mounted at the front end. Inside the cutting head is a radially sliding blade holder. During operation, clamping mechanisms on both sides fix the straightened tube, while the rotating spindle drives the cutting head to rotate at high speed. Simultaneously, a pneumatic or servo-driven external wedge sleeve is pushed axially, forcing the internal blade holder to contract towards the center using the inclined plane transmission principle. This drives the roller or cutter to circumferentially compress the tube wall until the tube breaks.

[0003] However, existing condenser tube straightening and cutting devices still have shortcomings when processing soft, ductile tubes. During the initial feed operation, the cutting tool and auxiliary support components of existing rotary cutting mechanisms typically employ a synchronous contraction feed method. This structure means that at the initial moment the tool contacts the tube wall for cutting, the tube does not form a circumferential grip and rigid support. Therefore, under the instantaneous impact of cutting resistance, the tube, in an unsteady state, is prone to radial vibration and slight displacement, leading to instability at the cutting center. This mechanical vibration during processing not only easily disrupts the perpendicularity of the cut end face, causing oblique cuts, but also easily induces compressive deformation at the cut for soft condenser tubes with lower hardness. Summary of the Invention

[0004] This invention provides a refrigeration unit condenser tube straightening and cutting device to solve the technical problem that existing rotary cutting equipment causes the cut end face to tilt due to synchronous feed vibration when processing soft and ductile tubes.

[0005] The present invention adopts the following technical solution: a refrigerated display case condenser tube straightening and cutting device. It includes a machine base, and a winding rack, a straightening assembly, a feeding assembly, a clamping assembly, and a rotary cutting assembly arranged sequentially along the condenser tube conveying direction on the machine base. Two sets of clamping assemblies are provided, located on the feeding side and the discharging side of the rotary cutting assembly, respectively. The rotary cutting assembly includes a rotary cutting main disc, a wedge-shaped sleeve fitted around its outer circumference with a conical inner wall, and four sets of pushing units arranged in a cross pattern on the end face of the rotary cutting main disc. Each pushing unit includes a support slider fixed to the rotary cutting main disc and a sliding sleeve block slidably fitted onto it and having a contact rod abutting against the conical surface of the wedge-shaped sleeve.

[0006] Among them, the two sets of opposing pushing units are inner units equipped with auxiliary pressure rollers, and the other two sets of opposing pushing units are outer units respectively equipped with rotary cutting blades and secondary pressure rollers; the distance between the contact rod of the inner unit and the conical surface is smaller than the distance between the contact rod of the outer unit and the conical surface; when the wedge sleeve moves axially, the auxiliary pressure roller is driven first to clamp the condenser tube, and then the rotary cutting blade and secondary pressure roller are driven to cut the condenser tube.

[0007] Furthermore, a protrusion is fixed near the edge of the end of the support slider that extends into the sliding sleeve. A return spring is connected between the inner wall of the sliding sleeve and the side of the protrusion. The sliding sleeve has a hollow structure and slides on the outer surface of the support slider.

[0008] Furthermore, the auxiliary pressure roller is used to clamp the condenser tube from above and below, and the rotary cutting blade and secondary pressure roller are used to clamp and cut the condenser tube from left and right. The pushing unit with two oppositely arranged auxiliary pressure rollers is located on the inner side, and the pushing unit with oppositely arranged rotary cutting blade and secondary pressure roller is located on the outer side.

[0009] Furthermore, the secondary pressure roller includes a roller shaft and two sets of pipe clamps sleeved on the roller shaft. A gap is formed between the two sets of pipe clamps for the rotary cutting blade to cut into. The secondary pressure roller is composed of two wheel bodies with a V-shaped opening between them. Each set of pipe clamps is composed of two semi-rings spliced ​​together by bolts. An oil storage and adsorption ring is embedded in the surface of the semi-ring. The roller shaft is a hollow structure with an oil injection nozzle at the end. An oil leakage hole is opened on the surface of the roller shaft to connect its inner cavity with the semi-ring mating surface. Lubricating oil is suitable to enter the semi-ring through the oil leakage hole and wet the oil storage and adsorption ring under the action of centrifugal force.

[0010] Furthermore, the rotary cutting assembly also includes a rotary unit and a forward unit. The rotary unit includes a support frame fixed on the machine base, a rotating shaft mounted on the machine base, and a drive motor. One end of the rotating shaft is fixedly connected to the rotary cutting main disc, and the other end is fixed with a driven pulley. The output end of the drive motor is provided with a driving pulley. The driving pulley and the driven pulley are connected by a belt body for transmission. The forward unit includes a feed cylinder fixed on the machine base and a pusher driven by the feed cylinder. One end of the pusher is connected to the feed cylinder, and the other end contacts the side of the wedge sleeve.

[0011] Furthermore, each clamping assembly includes a fixed frame, a fixed clamping block fixed within the fixed frame, a movable clamping block slidably disposed within the fixed frame, and a servo cylinder mounted on the outer side of the fixed frame. The output end of the servo cylinder is connected to the movable clamping block and is used to drive the movable clamping block to move closer to or away from the fixed clamping block to achieve clamping and fixing of the condenser tube. The rotating shaft bearing is disposed on the side of the fixed frame of the clamping assembly near the feed side of the rotary cutting assembly.

[0012] Furthermore, the feeding assembly includes a mounting plate and a fixing frame fixed to the top of the mounting plate. A sliding groove is provided on the side of the mounting plate, and a slider is slidably arranged in the sliding groove. A movable plate that fits against the side of the mounting plate is connected to the slider. An adjusting screw for adjusting the height of the movable plate is threadedly connected to the fixing frame. A drive wheel set is rotatably arranged on the side of the mounting plate, and a driven wheel set is rotatably arranged on the side of the movable plate. Conveyor belts are wound around the drive wheel set and the driven wheel set respectively. The two conveyor belts are arranged in close contact with each other. Multiple sets of opposing front pressure rollers are provided on the side of the mounting plate and near the inner side of the conveyor belts. One drive wheel in the drive wheel set is connected to a driving component, and the driving component is fixed to the side of the mounting plate.

[0013] Furthermore, the feeding assembly also includes a detection unit, which includes a support frame fixed to one side of the mounting plate and an arched frame mounted on the support frame. The arched frame is equipped with a push cylinder, and a support wheel is rotatably mounted on the side of the support frame. The output end of the push cylinder is connected to a detection wheel that is opposite to the support wheel via a sliding plate. The detection wheel is adapted to press the condenser tube and detect its passing length.

[0014] Furthermore, the straightening assembly includes a horizontal straightening unit and a vertical straightening unit arranged in sequence, as well as a control box mounted on the machine platform. The horizontal straightening unit includes a horizontal frame and several horizontal straightening wheels, and the vertical straightening unit includes a vertical frame and several vertical straightening wheels.

[0015] Furthermore, the unwinding frame includes a column, a crossbar extending from the top of the column, a guide pulley and a guide cylinder on the crossbar, an unwinding platform below the column, and a feeding bracket on the rear side of the machine, the feeding bracket having a feeding groove for receiving the cut condenser tube.

[0016] The above-described at least one technical solution adopted in the embodiments of the present invention can achieve the following beneficial effects:

[0017] The condenser tube straightening and cutting device for refrigerators utilizes a rotary cutting assembly. Four sets of pushing units, arranged in a cross shape, are driven by the conical surface of the inner wall of a wedge-shaped sleeve fitted around the main cutting disc. A special design ensures that the distance between the contact rod and the conical surface of the inner unit is smaller than that of the outer unit. When the feed cylinder pushes the wedge-shaped sleeve axially, a single drive source enables a mechanically automated, step-by-step sequential action: clamping followed by cutting. First, the auxiliary pressure roller is driven to move towards the center to grip the condenser tube for rigid centering. Then, the rotary cutting blade and secondary pressure roller are driven to contact and cut the condenser tube. This effectively solves the problem of unsteady tube constraints caused by the synchronous feeding of the cutter and support assembly in existing technologies. It eliminates mechanical vibration and radial runout caused by cutting resistance at the moment of entry, thereby improving the perpendicularity of the cut end face, avoiding oblique cutting, and effectively preventing pressure deformation of soft, ductile tubes at the cutting point, ensuring the quality of the tube end forming. Attached Figure Description

[0018] The accompanying drawings, which are provided to further illustrate the invention and constitute a part of this invention, are illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention.

[0019] In the attached diagram:

[0020] Figure 1 This is an overall schematic diagram of the condenser tube straightening and cutting device for the freezer in this application;

[0021] Figure 2 for Figure 1 A partial structural diagram;

[0022] Figure 3 for Figure 1 Enlarged view of point A;

[0023] Figure 4 for Figure 2 Enlarged view of point B;

[0024] Figure 5 for Figure 2 Schematic diagram of a partial structure;

[0025] Figure 6 for Figure 5 The left view;

[0026] Figure 7 for Figure 6 Enlarged view of point C;

[0027] Figure 8 for Figure 5 Enlarged view of point E;

[0028] Figure 9 for Figure 6 A partial structural diagram of the central rotary cutting disc;

[0029] Figure 10 for Figure 6 Schematic diagram of the main rotary cutting disk structure;

[0030] Figure label:

[0031] 1. Unwinding frame; 11. Column; 12. Guide pulley; 13. Guide cylinder; 14. Unwinding platform; 15. Material feeding bracket; 16. Material feeding chute; 2. Straightening assembly; 21. Machine base; 22. Horizontal frame; 23. Horizontal straightening roller; 24. Vertical frame; 25. Vertical straightening roller; 26. Control box; 3. Feeding assembly; 31. Mounting plate; 32. Fixed frame; 33. Slide chute; 34. Movable plate; 35. Adjusting screw; 36. Drive wheel assembly; 37. Driven wheel assembly; 38. Conveyor belt; 39. Front pressure roller; 310. Support frame; 311. Arch frame; 312. Push cylinder; 313. Support wheel; 314. Detection wheel; 315. Drive component; 4. Rotary cutting Components; 41. Feed cylinder; 42. Pushing component; 43. Rotating shaft; 44. Driven pulley; 45. Belt body; 46. Support frame; 47. Drive motor; 48. Drive pulley; 49. Rotary cutting disc; 410. Wedge sleeve; 411. Support slider; 412. Sliding sleeve block; 413. Contact rod; 414. Protrusion block; 415. Return spring; 417. Rotary cutting blade; 418. Auxiliary pressure roller; 420. Secondary pressure roller; 421. Roller shaft; 422. Oil injection nozzle; 423. Pipe clamp; 425. Bolt; 426. Oil storage suction ring; 5. Clamping assembly; 51. Fixed frame; 52. Fixed clamping block; 53. Servo cylinder; 54. Movable clamping block. Detailed Implementation

[0032] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the following detailed description of the specific implementation methods, structures, features and effects of the present invention, in conjunction with the accompanying drawings and preferred embodiments, is provided below.

[0033] The technical solutions provided by the various embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0034] like Figures 1-10 As shown, the present invention provides a refrigeration condenser tube straightening and cutting device, the main structure of which includes a machine base 21. Along the process conveying direction of the condenser tube, the machine base 21 is sequentially provided with a roll unwinding frame 1, a straightening component 2, a feeding component 3, a detection unit, two sets of clamping components 5, a rotary cutting component 4, a feeding bracket 15 and a feeding trough 16.

[0035] Reference Figures 1-3As shown, the unwinding frame 1 is independently installed at the front end of the production line, including a column 11 and an unwinding platform 14 at the bottom. The unwinding platform 14 is used to horizontally place the coiled condenser tubes, and the feeding trough 16 is used to receive the cut condenser tubes. A guide pulley 12 and a guide cylinder 13 are provided on the horizontal bar extending from the top of the column 11. The tube is drawn out from the coil, limited by the guide cylinder 13, and then smoothly transitions to the machine platform 21 via the guide pulley 12. After entering the machine platform 21, it first passes through the straightening assembly 2. The straightening assembly 2 includes a horizontal straightening unit and a vertical straightening unit. Through several horizontally aligned straightening wheels 23 on the horizontal frame 22 and several vertically aligned straightening wheels 25 on the vertical frame 24, the tube is subjected to bidirectional repeated bending along the X and Y axes to eliminate stress and achieve straightening.

[0036] Reference Figures 2-3 As shown, the core of the feeding assembly 3 lies in its gap adjustment and conveying mechanism. The feeding assembly 3 includes a mounting plate 31 fixed on the machine base 21. A fixing bracket 32 ​​is fixed on the top of the mounting plate 31, and a vertically downward adjusting screw 35 is threaded onto the fixing bracket 32. A vertically oriented slide groove 33 is provided on the side of the mounting plate 31, and a slider (not shown in the figure) is slidably disposed in the slide groove 33.

[0037] The bottom end of the adjusting screw 35 is rotatably connected to the surface of the slider via a bearing. A movable plate 34 is fixedly connected to the side of the slider, and the movable plate 34 is in contact with the side of the mounting plate 31. By rotating the adjusting screw 35, the slider is driven to move within the slide groove 33, which in turn causes the movable plate 34 to move up and down relative to the mounting plate 31 to adjust the feeding gap.

[0038] A drive pulley set 36 is rotatably mounted on the side of the mounting plate 31, and a driven pulley set 37 is rotatably mounted on the side of the movable plate 34. Two conveyor belts 38 are respectively wound around the drive pulley set 36 and the driven pulley set 37, and the two conveyor belts 38 are in close contact with each other. Multiple sets of opposing front pressure rollers 39 are provided on the side of the mounting plate 31, near the inner side of the conveyor belts 38, to press against the inner surface of the belts to increase the gripping force. A drive unit 315 (preferably a servo motor) is fixed to the side of the mounting plate 31, and its output shaft is connected to one of the drive pulleys in the drive pulley set 36 to provide power for conveying.

[0039] A detection unit is integrated on the discharge side of the feeding assembly 3 for real-time monitoring and feedback of the conveying length of the condenser tube. The detection unit includes a support frame 310 fixed to one side of the mounting plate 31. An arched frame 311 is fixedly installed on the top of the support frame 310. A push cylinder 312 is vertically installed downward at the top center of the arched frame 311. A lifting slide (not shown in the figure) is fixedly connected to the end of its output piston rod. The lifting slide is slidably set in a vertical guide groove opened in the inner wall of the support frame 310 to ensure the verticality of the lifting action. A detection wheel 314 is rotatably mounted on the side of the lifting slide via an axle. One end of the axle of the detection wheel 314 extends out of the slide and is coaxially connected to a rotary encoder. On the lower side of the support frame 310, directly below the detection wheel 314, a support wheel 313 is rotatably mounted via a bearing. The outer circumferential surface of the support wheel 313 is provided with a V-shaped guide groove adapted to the diameter of the condenser pipe to prevent the pipe from deviating. The outer circumferential surface of the detection wheel 314 is provided with an anti-slip knurled pattern to increase friction.

[0040] During operation, the push cylinder 312 drives the lifting slide to descend, so that the detection wheel 314 cooperates with the support wheel 313 below to press the condenser tube tightly. As the feeding assembly 3 drives the condenser tube to move forward, the friction force drives the pressed detection wheel 314 to roll synchronously, which in turn drives the rotary encoder to rotate and generate pulse signals. The control system accurately calculates the actual passing length of the condenser tube based on the number of pulses, thereby controlling the subsequent clamping and cutting actions.

[0041] like Figures 2-4 As shown, this device has two sets of clamping assemblies 5, located at the feed end and discharge end of the rotary cutting assembly 4, respectively. Each clamping assembly 5 includes a fixed frame 51, a fixed clamping block 52 fixed within the frame, a movable clamping block 54 slidably disposed within the frame, and a servo cylinder 53 for controlling the movement of the movable clamping block 54. The servo cylinder 53 is mounted on the outer side of the fixed frame 51, and its output end is connected to the movable clamping block 54, driving it to move closer to or away from the fixed clamping block 52. The clamping assembly 5 closest to the feed side of the rotary cutting assembly 4 also has a bearing seat on the side of its fixed frame 51. The rotating shaft 43 of the rotary cutting assembly 4 is supported on the fixed frame 51 by the bearing, achieving structural reuse and compact design.

[0042] The rotary cutting assembly 4 is the core actuator of this device. It mainly consists of a rotary unit, a rotary cutting head body, and a forward unit. The rotary unit includes a support frame 46 installed inside the machine base 21. A drive motor 47 is fixed on the support frame 46. A drive pulley 48 is keyed to the output shaft of the drive motor 47. A driven pulley 44 is keyed to the tail end of the rotating shaft 43. A belt body 45 is wound between the drive pulley 48 and the driven pulley 44. The drive motor 47 drives the rotating shaft 43 to rotate at high speed relative to the fixed frame 51 through belt transmission.

[0043] The front end of the rotating shaft 43 is fixedly connected to the rotary cutting main disk 49, which rotates synchronously with the rotating shaft 43. A wedge-shaped sleeve 410 is coaxially sleeved on the outer circumferential surface of the rotary cutting main disk 49. The wedge-shaped sleeve 410 and the rotary cutting main disk 49 are fitted in a circumferentially fixed but axially sliding manner (e.g., through a guide key or spline). The inner wall of the wedge-shaped sleeve 410 protruding from the end face of the rotary cutting main disk 49 is designed as an inner conical surface, which serves as the force application surface for the radial contraction of the subsequent driving tool.

[0044] The forward unit is used to drive the rotating wedge sleeve 410 to generate axial displacement. It includes a feed cylinder 41 fixedly mounted on the side of the fixed frame 51, and a pusher 42 driven by the feed cylinder 41. One end of the pusher 42 is fixedly connected to the piston rod of the feed cylinder 41, and the other end extends to the side of the wedge sleeve 410 and abuts against the side end face of the wedge sleeve 410 (preferably a thrust bearing structure is provided here to enable the stationary pusher 42 to push the high-speed rotating wedge sleeve 410). When feed is required, the feed cylinder 41 is activated, driving the pusher 42 to move forward. The pusher 42 then pushes the wedge sleeve 410 to slide forward along the axis of the rotary cutting disk 49, and uses the conical surface of the inner wall of the wedge sleeve 410 to squeeze the internal slider, thereby realizing the cutting action.

[0045] like Figures 4-10 As shown, four sets of pushing units are evenly distributed in a cross shape on the end face of the rotary cutting main disk 49. Each set of pushing units includes a support slider 411 fixed to the rotary cutting main disk 49, and a sliding sleeve 412 fitted around the support slider 411. The sliding sleeve 412 is hollow and can slide freely along the linear direction of the support slider 411. To achieve actuation, a contact rod 413 is fixed to the side of the sliding sleeve 412, the end of which abuts against the conical surface of the inner wall of the outer wedge-shaped sleeve 410. To ensure tool retraction and reset, a protrusion 414 is fixed near the edge of the support slider 411 extending into the sliding sleeve 412, and a reset spring 415 connects the inner wall of the sliding sleeve 412 and the side of the protrusion 414. When the wedge-shaped sleeve 410 retracts, the tension of the reset spring 415 pulls the sliding sleeve 412 back to its original position along the support slider 411.

[0046] To achieve the action sequence of clamping the pipe before cutting, this embodiment uses a differentiated design of the structural dimensions of the four sets of pushing units. Specifically, the four sets of pushing units are divided into inner units and outer units. The inner units are two sets arranged opposite each other, and each of their sliding sleeves 412 is equipped with an auxiliary pressure roller 418. The outer units are two other sets distributed at a 90-degree angle to the inner units, and each of their sliding sleeves 412 is equipped with a rotary cutting blade 417 and a secondary pressure roller 420.

[0047] In the initial state (i.e., when the wedge sleeve 410 is not activated), the distance between the contact rod 413 on the inner unit and the conical surface of the wedge sleeve 410 it abuts is denoted as L1, and the distance between the contact rod 413 on the outer unit and the conical surface of the wedge sleeve 410 it abuts is denoted as L2. In this embodiment, L1 < L2 (or described as: when the radial positions are the same, the outward extension length of the contact rod 413 of the inner unit is greater than that of the contact rod 413 of the outer unit).

[0048] When the feed cylinder 41 drives the wedge sleeve 410 forward axially, the inner conical surface of the wedge sleeve 410 displaces. Due to the small gap L1, the conical surface of the wedge sleeve 410 contacts and pushes the contact rod 413 of the inner unit first. At this time, the sliding sleeve block 412, equipped with auxiliary pressure rollers 418, overcomes the resistance of the return spring 415 and slides towards the center along the support slider 411 until the two auxiliary pressure rollers 418 are tightly pressed against and hold the condenser tube, completing the centering and anti-vibration fixation of the tube. At this time, due to the existence of the gap L2, the outer unit has not yet moved.

[0049] As the wedge sleeve 410 continues to advance axially, its conical surface then contacts and pushes the contact rod 413 of the outer unit. At this time, the sliding sleeve block 412, which is equipped with a rotary cutting blade 417 and a secondary pressure roller 420, begins to slide towards the center. With the auxiliary pressure roller 418 keeping it clamped, the rotary cutting blade 417 is simultaneously cut into the pipe wall by the action of the rotary cutting assembly 4, and the secondary pressure roller 420 cooperates to roll until the condenser tube is cut off.

[0050] The secondary pressure roller 420, positioned opposite the rotary cutting blade 417, employs a special self-lubricating composite structure. The secondary pressure roller 420 includes a hollow roller shaft 421 and two sets of clamps 423 sleeved on the roller shaft 421. One end of the roller shaft 421 is fixed to a set of sliding blocks 412. The two sets of clamps 423 are spaced apart along the axial direction of the roller shaft 421, thereby forming a gap between the two independent roller bodies for the rotary cutting blade 417 to cut into, so as to accommodate the opposite rotary cutting blade 417 at the end of the cutting process and prevent interference between the blades.

[0051] Each set of pipe clamps 423 is composed of two semi-rings joined together by bolts 425. An oil-absorbing ring 426 (such as high-density wool felt) is embedded in the surface of each semi-ring. An oil inlet 422 is installed at the end of the roller shaft 421, and an oil leakage hole is formed on the shaft surface, connecting the inner cavity to the semi-ring mating surface. When lubricating oil is injected into the inner cavity of the roller shaft 421 through the oil inlet 422, under the centrifugal force generated by the high-speed rotation of the rotary cutting head, the oil is thrown out and permeates into the oil-absorbing ring 426 through the oil leakage hole. When the secondary pressure roller 420 presses the pipe to roll, the absorption ring evenly coats the cutting path with an oil film, reducing cutting friction heat, preventing copper chips from adhering, and extending tool life.

[0052] It should be noted that a control box 26 is also installed on the machine base 21, which is the electrical control core of this device. The surface of the control box 26 is equipped with a human-machine interface panel for inputting process parameters such as the cutting length of the condenser tube, the conveying speed, and the processing quantity. It integrates a PLC controller. The control box 26 is electrically connected to the drive component 315 of the feeding assembly 3, the rotary encoder and push cylinder 312 of the detection unit, the servo cylinder 53 of the clamping assembly 5, and the drive motor 47 and feed cylinder 41 of the rotary cutting assembly 4.

[0053] When the device is working, the control box 26 receives the pulse signal fed back by the rotary encoder and converts it into the real-time length. When the preset cutting length is reached, the control box 26 controls the drive component 315 to stop conveying and issues commands in sequence: first, it controls the servo cylinder 53 to lock the two clamping components 5 to lock the pipe, then it controls the feed cylinder 41 to make the rotary cutting component 4 complete the cutting. After the cutting is completed, it controls each cylinder to reset and restarts the drive component 315 to convey the next section of pipe, thereby realizing fully automated straightening and cutting operations.

[0054] Working Principle: After the device is started, the coiled condenser tube is released from the unwinding rack 1 and guided into the straightening assembly 2. Stress is eliminated and the tube is straightened by the bidirectional repeated bending of the horizontal straightening wheel 23 and the vertical straightening wheel 25. Subsequently, the drive component 315 of the feeding assembly 3 drives the drive wheel group 36 to rotate, which, combined with the friction generated by the conveyor belt 38 and the front pressure wheel 39, smoothly transports the condenser tube forward. During this process, the push cylinder 312 of the detection unit actuates, causing the detection wheel 314 to press against the tube and roll synchronously with the tube's movement. The coaxially connected rotary encoder emits pulse signals in real time. The PLC system in the control box 26 calculates the conveying length in real time based on the number of pulses. When the preset cutting length is reached, the control box 26 instructs the feeding assembly 3 to immediately stop conveying, preparing for the cutting operation.

[0055] After the conveying stops, the control box 26 first controls the two sets of clamping components 5 located on the inlet and outlet sides of the rotary cutting assembly 4 to move. The servo cylinder 53 drives the movable clamping block 54 to close towards the fixed clamping block 52, firmly locking the condenser tube at both ends of the cutting area to prevent axial movement. At the same time, the drive motor 47 of the rotary cutting assembly 4 drives the rotating shaft 43 and the rotary cutting main disk 49 to maintain high-speed rotation via belt transmission. Subsequently, the feed cylinder 41 moves, pushing the rotating wedge sleeve 410 through the pusher 42, causing it to slide forward axially relative to the rotary cutting main disk 49. At this time, the conical surface of the inner wall of the wedge sleeve 410 begins to press inward against the contact rods 413 of the four sets of pushing units arranged in a cross shape.

[0056] Based on the difference in distance between the contact rod 413 of the pushing unit and the conical surface, the inner side L1 < the outer side L2. The conical surface of the wedge sleeve 410 contacts the contact rod 413 of the inner unit first, driving a pair of auxiliary pressure rollers 418 to preferentially contract towards the center and clamp the pipe, achieving rigid centering and vibration damping at the cutting point. As the wedge sleeve 410 continues to advance, the conical surface then contacts the outer unit, driving the rotary cutting blade 417 and the secondary pressure roller 420 to cut into the pipe wall towards the center. During the cutting process, the lubricating oil inside the secondary pressure roller 420 seeps out through the oil storage adsorption ring 426 under the action of centrifugal force, automatically lubricating and cooling the cut. When the pipe is completely cut off, the feed cylinder 41 and the servo cylinder 53 retract, the return spring 415 pulls each sliding sleeve block 412 to centrifugally reset, the feeding assembly 3 restarts, and enters the next processing cycle.

[0057] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A refrigeration unit condenser pipe straightening and cutting device, characterized in that: The assembly includes a machine base (21), and a winding rack (1), a straightening assembly (2), a feeding assembly (3), a clamping assembly (5), and a rotary cutting assembly (4) arranged sequentially on the machine base (21) along the conveying direction of the condenser pipe. The clamping assembly (5) is provided in two sets, located on the feeding side and the discharge side of the rotary cutting assembly (4), respectively. The rotary cutting assembly (4) includes a rotary cutting main disk (49), a wedge-shaped sleeve (410) sleeved on its outer periphery and with a conical inner wall, and four sets of pushing units arranged in a cross pattern on the end face of the rotary cutting main disk (49). Each set of pushing units includes a support slider (411) fixed on the rotary cutting main disk (49) and a sliding sleeve block (412) slidably sleeved on it and having a contact rod (413) abutting against the conical surface of the wedge-shaped sleeve (410). Among them, the two sets of opposing pushing units are inner units with auxiliary pressure rollers (418) installed, and the other two sets of opposing pushing units are outer units with rotary cutting blades (417) and secondary pressure rollers (420) installed respectively. The distance between the contact rod (413) of the inner unit and the conical surface is smaller than the distance between the contact rod (413) of the outer unit and the conical surface. When the wedge sleeve (410) moves axially, it first drives the auxiliary pressure roller (418) to clamp the condenser tube, and then drives the rotary cutting blade (417) and secondary pressure roller (420) to cut the condenser tube.

2. The refrigeration unit condenser tube straightening and cutting device according to claim 1, characterized in that: The end of the support slider (411) that extends into the sliding sleeve (412) is fixed with a protrusion (414) near the edge. A return spring (415) is connected between the inner wall of the sliding sleeve (412) and the side of the protrusion (414). The sliding sleeve (412) has a hollow structure and slides on the outer surface of the support slider (411).

3. The refrigeration unit condenser tube straightening and cutting device according to claim 1, characterized in that: The auxiliary pressure roller (418) is used to clamp the condenser tube from the top and bottom, and the rotary cutting blade (417) and the secondary pressure roller (420) are used to clamp and cut the condenser tube from the left and right. The pushing unit with two oppositely arranged auxiliary pressure rollers (418) is located on the inner side, and the pushing unit with oppositely arranged rotary cutting blades (417) and secondary pressure rollers (420) is located on the outer side.

4. The refrigeration unit condenser tube straightening and cutting device according to claim 1, characterized in that: The secondary pressure roller (420) includes a roller shaft (421) and two sets of pipe clamps (423) sleeved on the roller shaft (421). A gap is formed between the two sets of pipe clamps (423) for the rotary cutting blade (417) to cut into. The secondary pressure roller (420) is composed of two wheel bodies, and a V-shaped opening is formed between them. Each set of pipe clamps (423) is composed of two half rings spliced ​​together by bolts (425). An oil storage and adsorption ring (426) is embedded in the surface of the half ring. The roller shaft (421) is a hollow structure and has an oil injection nozzle (422) at the end. An oil leakage hole is opened on the surface of the roller shaft (421) to connect its inner cavity with the joint surface of the half ring. The lubricating oil is suitable to enter the half ring through the oil leakage hole under the action of centrifugal force and wet the oil storage and adsorption ring (426).

5. The refrigeration unit condenser tube straightening and cutting device according to claim 1, characterized in that: The rotary cutting assembly (4) further includes a rotary unit and a forward unit. The rotary unit includes a support frame (46) fixed on the machine base (21), a rotating shaft (43) set on the machine base (21), and a drive motor (47). One end of the rotating shaft (43) is fixedly connected to the rotary cutting main disc (49), and the other end is fixed with a driven pulley (44). The output end of the drive motor (47) is provided with a driving pulley (48). The driving pulley (48) and the driven pulley (44) are connected by a belt body (45). The forward unit includes a feed cylinder (41) fixed on the machine base (21) and a pusher (42) driven by the feed cylinder (41). One end of the pusher (42) is connected to the feed cylinder (41), and the other end contacts the side of the wedge sleeve (410).

6. The refrigeration unit condenser tube straightening and cutting device according to claim 5, characterized in that: Each clamping assembly (5) includes a fixed frame (51), a fixed clamping block (52) fixed in the fixed frame (51), a movable clamping block (54) slidably disposed in the fixed frame (51), and a servo cylinder (53) installed on the outer side of the fixed frame (51). The output end of the servo cylinder (53) is connected to the movable clamping block (54) and is used to drive the movable clamping block (54) to move closer to or away from the fixed clamping block (52) to achieve clamping and fixing of the condenser tube. The rotating shaft (43) bearing is disposed on the side of the fixed frame (51) of the clamping assembly (5) near the feeding side of the rotary cutting assembly (4).

7. The refrigeration unit condenser tube straightening and cutting device according to claim 1, characterized in that: The feeding assembly (3) includes a mounting plate (31) and a fixing frame (32) fixed to the top of the mounting plate (31). A groove (33) is provided on the side of the mounting plate (31), and a slider is slidably disposed within the groove (33). A movable plate (34) fitted to the side of the mounting plate (31) is connected to the slider. An adjusting screw (35) for adjusting the height of the movable plate (34) is threaded onto the fixing frame (32). A drive wheel assembly (36) is rotatably disposed on the side of the mounting plate (31). The movable plate (34) is rotatably provided with a driven wheel set (37). The driven wheel set (36) and the driven wheel set (37) are respectively provided with a conveyor belt (38). The two conveyor belts (38) are arranged in close contact with each other. The mounting plate (31) is provided with multiple sets of front pressure wheels (39) arranged in opposite directions on its side and near the inner side of the conveyor belts (38). One of the driven wheels in the driven wheel set (36) is connected to a driving component (315). The driving component (315) is fixed to the side of the mounting plate (31).

8. The refrigeration unit condenser tube straightening and cutting device according to claim 7, characterized in that: The feeding assembly (3) further includes a detection unit, which includes a support frame (310) fixed on one side of the mounting plate (31) and an arched frame (311) set on the support frame (310). The arched frame (311) is provided with a push cylinder (312). The support frame (310) is rotatably provided with a support wheel (313). The output end of the push cylinder (312) is connected to a detection wheel (314) that is opposite to the support wheel (313) through a sliding plate. The detection wheel (314) is suitable for pressing the condenser tube and detecting its passing length.

9. The refrigeration unit condenser tube straightening and cutting device according to claim 1, characterized in that: The straightening assembly (2) includes a horizontal straightening unit and a vertical straightening unit arranged in sequence, and a control box (26) arranged on the machine (21). The horizontal straightening unit includes a horizontal frame (22) and a number of horizontal straightening wheels (23). The vertical straightening unit includes a vertical frame (24) and a number of vertical straightening wheels (25).

10. The refrigeration unit condenser tube straightening and cutting device according to claim 1, characterized in that: The unwinding frame (1) includes a column (11), a crossbar extending from the top of the column (11), a guide pulley (12) and a guide cylinder (13) on the crossbar, an unwinding platform (14) below the column (11), and a feeding bracket (15) on the rear side of the machine base (21), with a feeding groove (16) on the feeding bracket (15) for receiving the cut condenser tube.

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