An insulation capillary end pre-processing device based on pressure cutting sealing technology

Abstract

This utility model discloses an insulated capillary end pretreatment device based on pressure cutting and sealing technology, including an operating platform. The device features a small motor on the operating platform, with a pin coaxially fixed to the motor's output shaft. The pin's diameter is clearance-fitted with the inner hole of the insulated capillary. Two guide sleeves are provided on the operating platform, coaxial with the pin. A pressure cutting machine is positioned between one guide sleeve and the small motor, and a sealing knife is positioned between the two guide sleeves. This device prepares the insulated capillary for non-destructive peeling of the welded surface, avoiding damage to the copper-based tube caused by other insulation removal methods. The sealing process prevents solvent from seeping into the tube during non-destructive peeling, reducing unnecessary cleaning and drying work and contamination. It also ensures the insulated capillary remains clean before being combined with the return air pipe. Both the pressure cutting and sealing knives are detachable, adaptable to various capillary end pretreatment specifications, and highly versatile.

Description

Technical Field

[0001] This utility model relates to the field of refrigeration equipment parts processing technology, specifically to an insulated capillary end pretreatment device based on pressure cutting and sealing technology, which is used to solve the problems of substrate damage or solvent contamination during the peeling process of the welded end of the insulated capillary. Background Technology

[0002] Copper capillary tubes are mainly used in products such as refrigerators and freezers to wrap with return pipes to form return pipe assemblies. Currently, there are usually two types of return pipe assemblies: one is a combination of copper capillary tubes and copper return pipes, and the other is a combination of copper capillary tubes and aluminum return pipes.

[0003] Whether combining a copper capillary tube with a copper return pipe or a copper capillary tube with an aluminum return pipe, welding is required. Since the insulating layer on the surface of the insulating capillary tube can affect welding, the weld ends of the insulating capillary tube need to be de-insulated. Currently, the de-insulation methods are mainly mechanical de-insulation and solvent de-insulation. Mechanical de-insulation uses various mechanical devices to physically remove the insulating layer from the surface of the insulating capillary tube. Because this method inevitably causes some damage to the copper base tube, increasing the risk of poor welding quality at the subsequent ends of the insulating capillary tube, it is rarely used. Solvent de-insulation uses chemical solvents to remove the insulating layer from the surface of the insulating capillary tube. Although this method effectively avoids damage to the copper capillary tube substrate and does not affect subsequent welding, solvent residue inside the capillary tube during immersion de-insulation and subsequent cleaning may cause oxidation of the inner wall, leading to blockage and other quality problems.

[0004] Therefore, how to solve the problem of non-destructive peeling technology at the ends of insulated capillaries is a key issue that urgently needs to be addressed in the application of insulated capillaries. Summary of the Invention

[0005] The purpose of this invention is to solve the above problems by providing an insulated capillary end pretreatment device based on pressure cutting and sealing technology, which achieves non-destructive peeling through pressure cutting and sealing technology.

[0006] The above-mentioned technical problems of this utility model are mainly solved by the following technical solution: an insulated capillary end pretreatment device based on pressure cutting and sealing technology, including an operating platform, characterized in that a small motor is provided on the operating platform, a pin is coaxially fixed on the output shaft of the small motor, the diameter of the pin is clearance-fitted with the inner hole of the insulated capillary; two guide sleeves are provided on the operating platform, the guide sleeves are coaxial with the pin, a pressure cutting machine is provided between one guide sleeve and the small motor, and a sealing knife is provided between the two guide sleeves.

[0007] In the aforementioned pretreatment device for the end of an insulating capillary based on pressure cutting and sealing technology, preferably, the pressure cutting machine includes a pair of cylinders symmetrically arranged with respect to the insulating capillary. Each pair of cylinders drives a pressure cutting head, and the blades of the two pressure cutting heads form an arc blade that matches the diameter of the insulating capillary.

[0008] In the aforementioned pretreatment device for the end of an insulating capillary based on pressure cutting and sealing technology, preferably, the diameter of the arc formed by the blades of the two pressure cutting heads (501) is larger than the inner diameter of the insulating capillary and smaller than the outer diameter of the insulating capillary.

[0009] In the aforementioned pretreatment device for the end of an insulating capillary based on pressure cutting and sealing technology, preferably, the pressure cutting head and the cylinder have a detachable assembly structure.

[0010] In the aforementioned pretreatment device for the end of an insulating capillary based on pressure cutting and sealing technology, preferably, the sealing knife includes a pair of cylinders symmetrically arranged with the insulating capillary. Each pair of cylinders drives a tail-cutting head, and the two tail-cutting heads squeeze the end of the insulating capillary to form a sealing crimp.

[0011] In the aforementioned pretreatment device for the end of an insulating capillary tube based on pressure cutting and sealing technology, preferably, the tail-cutting cutter head and the cylinder have a detachable assembly structure.

[0012] In the aforementioned pretreatment device for the end of an insulating capillary tube based on pressure-cutting sealing technology, preferably, the length of the ejector pin is greater than or equal to the distance between the small motor and the guide sleeve near the small motor, and less than the distance between the small motor and the sealing knife.

[0013] In the aforementioned pretreatment device for the end of an insulating capillary based on pressure cutting and sealing technology, preferably, the pressure cutting head includes an arc-shaped positioning section with a diameter equal to that of the insulating capillary, the arc-shaped positioning section is in contact with the outer wall of the insulating capillary, and the blade is located in the middle of the arc-shaped positioning section.

[0014] In the aforementioned pretreatment device for the end of an insulating capillary based on pressure cutting and sealing technology, preferably, the tail-cutting cutter head has a tapered extrusion orifice, the radial length of which is greater than the diameter of the insulating capillary.

[0015] The positioning mechanism of this technical solution consists of a small motor on the operating platform, with a pin coaxially fixed to its output shaft. The pin diameter is fitted with the inner hole of the insulating capillary to fix the capillary axially. Two guide sleeves are also arranged coaxially with the pin to ensure the mobility of the capillary in a straight line, enabling the two steps of pressing and sealing to be completed in one process.

[0016] As a pressure cutting mechanism for pre-cutting the diameter of the insulating capillary, it is set between the guide sleeve and the small motor near the small motor, so that the pressure cutting process has sufficient radial support strength with the cooperation of the ejector pin. Under the premise of ensuring the pressure cutting depth, it avoids the deformation of the insulating capillary. It includes a pair of symmetrical cylinder-driven pressure cutting heads, and the blade edge forms an arc blade that matches the diameter of the capillary. The pressure cutting depth is between the inner and outer diameters of the capillary, that is, it only cuts the insulation layer without penetrating the tube wall.

[0017] Furthermore, the sealing mechanism is located between the two guide sleeves. After the pressure cutting step is completed, the insulating capillary moves axially. While ensuring that the pre-cut length is within the minimum length range, it works continuously in conjunction with the pressure cutting action to achieve synchronous and efficient completion of the process. It includes a pair of cylinder-driven tail-cutting cutters that flatten and seal the end of the capillary through a conical extrusion port to prevent solvent from seeping into the insulating capillary during the solvent peeling step.

[0018] Furthermore, the cutting head and cylinder are detachably connected, facilitating the replacement of different head specifications. The ejector pin length is limited to "greater than or equal to the distance from the small motor to the near-end guide sleeve, and less than the distance from the small motor to the sealing blade," ensuring stable capillary fixation and facilitating two-step operation. The cutting head features an arc-shaped positioning section that fits snugly against the outer wall of the capillary, with the blade edge centered, improving cutting accuracy and ensuring stability during the cutting process. The radial length of the tapered extrusion opening of the tail-cutting blade is greater than the capillary diameter to ensure a complete seal at the tail.

[0019] Compared with the prior art, the beneficial effects of this utility model are: by continuously and efficiently performing two operations of cutting and sealing, the surface of the insulated capillary weld is removed without damage, avoiding the damage to the copper base tube caused by other methods of removing the insulation layer; the sealing process prevents solvent from seeping into the tube during the non-destructive removal process, thus avoiding unnecessary cleaning and drying work and reducing pollution; at the same time, it ensures that the insulated capillary remains clean before being combined with the return gas tube; both the cutting and sealing blades are detachable, adaptable to the pretreatment of capillary ends of various specifications, and have strong versatility. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of this utility model.

[0021] Figure 2 This is the front view of this utility model.

[0022] Figure 3 yes Figure 2 The right view.

[0023] Figure 4 This is a schematic diagram of a small motor and ejector pin structure according to the present invention.

[0024] Figure 5 This is a schematic diagram of a pressure cutting head structure according to this utility model.

[0025] Figure 6 yes Figure 5 A magnified schematic diagram of the central blade edge.

[0026] Figure 7 This is a schematic diagram of the structure of a sealing knife and a tail-cutting knife head according to this utility model.

[0027] Figure 8 This is a schematic diagram of the pre-treatment state of the insulated capillary tube after completion of the present invention.

[0028] Figure 9 This is an electrical control diagram of this utility model.

[0029] In the diagram: 1-Operating platform; 2-Small motor; 3-First guide sleeve; 4-Second guide sleeve; 5-Pressure cutting machine; 501-Pressure cutting head; 5011-Blade edge; 6-Sealing knife; 601-Tail-cutting knife head; 7-Insulating capillary tube; 8-Ejector pin. Detailed Implementation

[0030] The technical solution of this utility model will be further described in detail below through embodiments and in conjunction with the accompanying drawings.

[0031] This embodiment describes an insulated capillary end pretreatment device based on pressure-cutting and sealing technology, such as... Figures 1 to 3 As shown, an operating platform 1 is provided. A small motor 2 is installed at one end of the operating platform 1. A pin 8 is coaxially fixed on the output shaft of the small motor 2. Figure 4 As shown, the diameter of the ejector pin 8 is clearance-fitted with the inner hole of the insulating capillary tube 7. Two guide sleeves, namely the first guide sleeve 3 and the second guide sleeve 4, are provided on the operating platform 1. Both guide sleeves are coaxial with the ejector pin. A cutting machine 5 is located between the first guide sleeve 3 and the small motor, and a sealing knife 6 is located between the first guide sleeve 3 and the second guide sleeve 4. Both the cutting machine 5 and the sealing knife 6 are perpendicular to the ejector pin 8 and horizontally arranged on the operating platform 1.

[0032] The pressure cutting machine 5 includes a pair of synchronous cylinders symmetrically arranged with insulated capillary tubes 7. Each pair of synchronous cylinders drives a pressure cutting head 501. The two pressure cutting heads 501 have the same structure, such as... Figure 5 , Figure 6 As shown, the blades 5011 of the two cutting heads 501 form an arc-shaped blade that matches the diameter of the insulating capillary 7. The diameter of the arc-shaped blade formed by the blades 5011 of the two cutting heads 501 is larger than the inner diameter of the insulating capillary 7 and smaller than the outer diameter of the insulating capillary 7. In actual manufacturing, the cutting head 501 should include an arc-shaped positioning section with a diameter equal to that of the insulating capillary 7. The arc-shaped positioning section should fit against the outer wall of the insulating capillary 7, and the blades 5011 should be located in the middle of the arc-shaped positioning section to ensure the stability of the cutting process.

[0033] The cutting head 501 and the cylinder have a detachable assembly structure to suit the cutting and sealing operations of various specifications of insulating capillary tubes 7.

[0034] The structure of the tail-sealing knife 6 is as follows Figure 7 As shown, the device includes a pair of synchronized cylinders symmetrically arranged around an insulating capillary tube 7. Each cylinder drives a tail-cutting cutter head 601. The two tail-cutting cutter heads 601 have identical structures and compress the ends of the insulating capillary tube 7 to form a sealing orifice. The tail-cutting cutter head 601 has a tapered compression orifice, the radial length of which is greater than the diameter of the insulating capillary tube 7.

[0035] The tail-cutting cutter head 601 and the cylinder are also detachable assembly structures to suit the pressing, cutting and sealing operations of various specifications of insulating capillary tubes 7.

[0036] Furthermore, the length of the ejector pin 8 is greater than or equal to the distance between the small motor 2 and the guide sleeve (i.e., the first guide sleeve 3) near the small motor, and less than the distance between the small motor 2 and the sealing knife 6, so that the ejector pin 8 does not affect the operation of the sealing knife 6.

[0037] The electrical control system of this device uses the most conventional electrical control technology, and its control diagram is as follows: Figure 9 As shown.

[0038] Working principle and usage: The non-destructive pretreatment of the end of the insulating capillary 7 is achieved by combining mechanical cutting and sealing. This not only prepares the insulating capillary 7 for solvent descaling process and avoids solvent contamination inside the tube, but also keeps the inside of the insulating capillary 7 clean before welding it to the return gas pipe assembly. Before welding, a small section of the end cap can be easily removed by using the cutting tool. Generally, this small section is about 10mm long and the material head can be recycled after being removed.

[0039] The specific process for using this device is as follows: 1) Insert the insulating capillary tube 7 into the coaxial ejector pin 8 and position it by the first guide sleeve 3 and the second guide sleeve 4; 2) Start the small motor 2, which drives the ejector pin 8 to rotate while keeping the insulating capillary tube 7 stationary; 3) The arc-shaped cutter head 501 of the pressure cutter 5 symmetrically cuts the insulation layer at the tube end, with the depth controlled between the inner and outer diameters of the tube wall. At this time, the rotating ejector pin 8 provides uniform support to the insulating capillary tube 7 from the inside out, preventing deformation of the insulating capillary tube 7 and maintaining the coaxiality of the insulating capillary tube 7 and the ejector pin; 4) Stop the small motor 8, release the pressure cutter 5, and pull out the insulating capillary tube 7 so that the end of the insulating capillary tube 7 is located at the working point of the sealing knife 6. The conical extrusion head (tail-cutting head 601) of the sealing knife 6 flattens and seals the cut end; 5) Turn the insulating capillary tube 7 around to perform the other end cutting and sealing steps.

[0040] The insulating capillary tube 7, which has been cut and sealed at both ends, is placed in a solvent according to the welding requirements to remove the surface insulation layer, and then cleaned and dried for later use.

[0041] The above embodiments are illustrative of the present invention and not intended to limit the present invention. The described embodiments are merely some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present invention.

Claims

1. An insulated capillary end pretreatment device based on pressure cutting and sealing technology, comprising an operating platform (1), characterized in that... A small motor (2) is provided on the operating platform. A pin (8) is coaxially fixed on the output shaft of the small motor. The diameter of the pin is in clearance fit with the inner hole of the insulating capillary tube (7). Two guide sleeves are provided on the operating platform. The guide sleeves are coaxial with the pin. A pressure cutter (5) is provided between one guide sleeve and the small motor. A sealing knife (6) is provided between the two guide sleeves.

2. The pretreatment device for the end of an insulating capillary tube based on pressure-cutting and sealing technology according to claim 1, characterized in that, The pressure cutting machine (5) includes a pair of cylinders symmetrically arranged with an insulating capillary tube (7). Each pair of cylinders drives a pressure cutting head (501), and the blades (5011) of the two pressure cutting heads form an arc blade that matches the diameter of the insulating capillary tube.

3. The pretreatment device for the end of an insulating capillary tube based on pressure-cutting and sealing technology according to claim 2, characterized in that, The diameter of the arc formed by the blades (5011) of the two cutting heads (501) is larger than the inner diameter of the insulating capillary (7) and smaller than the outer diameter of the insulating capillary.

4. The pretreatment device for the end of an insulating capillary tube based on pressure-cutting and sealing technology according to claim 2 or 3, characterized in that, The cutting head (501) and the cylinder have a detachable assembly structure.

5. The pretreatment device for the end of an insulating capillary tube based on pressure-cutting and sealing technology according to claim 1, characterized in that, The sealing knife (6) includes a pair of cylinders symmetrically arranged with an insulating capillary tube (7). The pair of cylinders drive a tail-cutting head (601) respectively, and the two tail-cutting heads squeeze the end of the insulating capillary tube (7) to form a sealing port.

6. The pretreatment device for the end of an insulating capillary tube based on pressure-cutting and sealing technology according to claim 5, characterized in that, The tail cutter head (601) and the cylinder have a detachable assembly structure.

7. The pretreatment device for the end of an insulating capillary tube based on pressure-cutting and sealing technology according to claim 1, characterized in that, The length of the ejector pin (8) is greater than or equal to the distance between the small motor (2) and the guide sleeve near the small motor, and less than the distance between the small motor (2) and the sealing knife (6).

8. An insulated capillary end pretreatment device based on pressure-cutting and sealing technology according to claim 2 or 3, characterized in that, The cutting head (501) includes an arc-shaped positioning section with the same diameter as the insulating capillary (7). The arc-shaped positioning section is in contact with the outer wall of the insulating capillary, and the blade (5011) is located in the middle of the arc-shaped positioning section.

9. The pretreatment device for the end of an insulating capillary tube based on pressure-cutting and sealing technology according to claim 5, characterized in that, The tail-cutting cutter head (601) has a tapered extrusion orifice, the radial length of which is greater than the diameter of the insulating capillary tube (7).

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