Connecting and welding process for inner cylinder and outer cylinder of refrigerating cylinder for ice maker

Abstract

The invention relates to the technical field of refrigeration cylinder processing, in particular to an inner cylinder and outer cylinder connecting and welding process of a refrigeration cylinder for an ice maker, which is characterized by comprising the following steps: S1, appearance detection, S2, cleaning, S3, press fitting, S4, inner cylinder stretching, S5, welding, S6, detection, and S7, polishing and warehousing. According to the invention, the inner wall of the outer cylinder body and the outer wall of the inner cylinder body are ensured to be comprehensively attached in a mode of stretching and then welding, the gas blow-by problem is avoided, and the preparation quality of the ice cream is ensured.

Description

Technical Field

[0001] This invention relates to the field of refrigeration cylinder processing technology, specifically to a welding process for connecting the inner and outer cylinders of a refrigeration cylinder for an ice maker. Background Technology

[0002] like Figure 1 The ice cream refrigeration cylinder shown consists of an inner cylinder 11 and an outer cylinder 12. Its difference from a conventional ice maker cylinder lies in that the working surface is the inner surface. Conventional ice makers often use thermal expansion and contraction for pressing. Due to errors in the manufacturing process, this method of fixing inevitably leads to air leakage between adjacent flow channels in the inner and outer cylinders, making it impossible to guarantee that the entire working surface can be refrigerated. This problem is particularly important when making ice cream and will greatly affect the quality of the ice cream. Therefore, it is particularly important to design a welding process for connecting the inner and outer cylinders of the ice maker refrigeration cylinder in order to solve the above problems. Summary of the Invention

[0003] To solve the above problems, this invention designs a welding process for connecting the inner and outer cylinders of an ice maker's refrigeration cylinder. By stretching before welding, the inner wall of the outer cylinder and the outer wall of the inner cylinder are fully fitted together, avoiding the problem of air leakage and ensuring the quality of ice cream preparation.

[0004] To solve the above-mentioned technical problems, the present invention provides a welding process for connecting the inner and outer cylinders of a refrigeration cylinder for an ice maker, characterized by the following steps: S1: Visual inspection: Workers observe the surfaces of the inner and outer cylinders to be processed, as well as the positions of the cut holes, to prevent the pressing of defective parts. S2: Cleaning: The press-fitted surfaces of the inner and outer cylinders are cleaned by blowing with a high-pressure air gun. S3: Press fitting: The cleaned inner cylinder is pressed into the outer cylinder by a press fitting machine and press fitting fixtures, with the lower end of the inner cylinder passing through the outer cylinder. S4: Inner cylinder stretching: Place the workpiece pressed in step S3 into the stretching fixture, and stretch the inner cylinder in the workpiece through the stretching fixture so that the outer wall of the inner cylinder is fully attached to the inner wall of the outer cylinder. S5: Welding: Using welding equipment, perform spiral welding around the stretched workpiece to completely fix the outer cylinder to the inner cylinder. S6: Inspection: The welded refrigeration cylinder is sent into the air tightness testing device for air tightness testing; S7: Polishing and Warehousing: The airtightness test qualified refrigeration cylinders are sent to the polishing machine for polishing, and then stored in the warehouse after polishing.

[0005] Furthermore, in step S1, the inner and outer cylinders are first cut with holes before surface observation. First, a feeding port and a temperature sensing port are cut on the surface of the inner cylinder, and then a notch matching the temperature sensing port, as well as a liquid inlet and an air outlet, are cut on the surface of the outer cylinder in sequence.

[0006] Furthermore, the pressing fixture in step S3 consists of an outer cylinder placement seat and an inner cylinder positioning seat. The outer cylinder placement seat is fixed on the worktable of the pressing machine, and the inner cylinder positioning seat is connected to the lower pressing shaft end of the pressing machine. The outer cylinder placement seat is composed of a bottom mounting plate and a support seat integrated with it on the mounting plate. The top of the support seat has a groove that matches the end of the outer cylinder. The support seat in the groove has a guide hole for the inner cylinder to extend into. The bottom of the inner cylinder positioning seat has a positioning groove that matches the end of the inner cylinder with the induction temperature measuring port. A first through groove is formed on one side of the positioning groove relative to the position of the induction temperature measuring port.

[0007] Further, the stretching fixture in step S4 includes a fixture base plate, a placement seat, a fixture top plate, an inner stretching head, and a stretching hydraulic cylinder. The fixture top plate is fixed directly above the fixture base plate by a column. The placement seat is placed on the fixture base plate and fixed to it by bolts. The top of the placement seat has a placement slot that matches the end cap of the refrigeration cylinder. The inner stretching head is located directly above the placement slot and is connected to the output shaft end of the stretching hydraulic cylinder. The fixture top plate has a slot for the inner stretching head to pass through. A second slot is formed on the placement seat on one side of the slot, relative to the position of the induction temperature measuring port.

[0008] Furthermore, a refrigeration cylinder limiting plate is installed on the tooling base plate in the through groove. A limiting protrusion integrated with the refrigeration cylinder limiting plate is provided at the center of the refrigeration cylinder limiting plate. A limiting connecting groove matching the limiting protrusion is opened on the end cap of the refrigeration cylinder.

[0009] Furthermore, after the inner cylinder and outer cylinder are welded and fixed in step S5, the feed pipe, liquid inlet pipe, gas outlet pipe and induction temperature measuring connector are welded and fixed in sequence at the cut holes on the inner cylinder and outer cylinder.

[0010] Furthermore, after the induction temperature measuring connector on the inner cylinder is welded, a flange structure is welded and fixed on the end away from the end cover.

[0011] Furthermore, the airtightness test in step S6 requires that the refrigeration cylinder does not leak even under a pressure of 3.8 MPa.

[0012] With the above structure, the present invention has the following beneficial effects: This invention ensures a complete fit between the inner wall of the outer cylinder and the outer wall of the inner cylinder by stretching before welding, thus avoiding gas leakage and guaranteeing the quality of ice cream preparation.

[0013] 2. The above-mentioned process of this invention makes the connection between the inner and outer cylinders more stable, and it can maintain a pressure of 4.5MPa without leakage, thus improving the quality of the refrigeration cylinder. Attached Figure Description

[0014] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0015] Figure 1 This is a schematic diagram of the structure of an ice cream refrigeration cylinder.

[0016] Figure 2 This is a schematic diagram of the press-fitting fixture.

[0017] Figure 3 This is a schematic diagram of the inner cylinder positioning seat in the press-fitting fixture.

[0018] Figure 4 This is a schematic diagram of the tensioning fixture.

[0019] Figure 5 This is a structural diagram of the refrigeration cylinder limiting plate. Detailed Implementation

[0020] The technical solution of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] In the description of this invention, it should be noted that certain terms indicating orientation or positional relationships are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting this invention.

[0022] In the description of this invention, it should be noted that the term "connection" should be interpreted broadly. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0023] The present invention will be further described in detail below through specific embodiments.

[0024] This invention provides a welding process for connecting the inner and outer cylinders of a refrigeration cylinder for an ice maker, specifically including the following steps: S1: Visual inspection: Workers observe the surfaces of the inner and outer cylinders to be processed, as well as the positions of the cut holes, to prevent the pressing of defective parts. S2: Cleaning: The press-fitted surfaces of the inner and outer cylinders are cleaned by blowing with a high-pressure air gun. S3: Press fitting: The cleaned inner cylinder is pressed into the outer cylinder by a press fitting machine and press fitting fixtures, with the lower end of the inner cylinder passing through the outer cylinder. S4: Inner cylinder stretching: Place the workpiece pressed in step S3 into the stretching fixture, and stretch the inner cylinder in the workpiece through the stretching fixture so that the outer wall of the inner cylinder is fully attached to the inner wall of the outer cylinder. S5: Welding: Using welding equipment, perform spiral welding around the stretched workpiece to completely fix the outer cylinder to the inner cylinder. S6: Inspection: The welded refrigeration cylinder is sent into the air tightness testing device for air tightness testing; S7: Polishing and Warehousing: The airtightness test qualified refrigeration cylinders are sent to the polishing machine for polishing, and then stored in the warehouse after polishing.

[0025] This invention ensures a complete fit between the inner wall of the outer cylinder and the outer wall of the inner cylinder through a stretching-then-welding method, preventing gas leakage and guaranteeing the quality of ice cream preparation. Furthermore, the above process makes the connection between the inner and outer cylinders more stable, maintaining a pressure of 4.5 MPa without leakage, thus improving the quality of the refrigeration cylinder.

[0026] Before observing the surface of the inner and outer cylinders in step S1 above, the inner and outer cylinders are first cut with holes. First, the feeding port and the induction temperature measuring port are cut on the surface of the inner cylinder. Then, the notch matching the induction temperature measuring port, as well as the liquid inlet and the gas outlet are cut on the surface of the outer cylinder in sequence.

[0027] like Figure 2 and Figure 3The pressing fixture in step S3 consists of an outer cylinder placement seat 1 and an inner cylinder positioning seat 2. The outer cylinder placement seat is fixed on the worktable of the pressing machine. The inner cylinder positioning seat is connected to the lower pressing shaft end of the pressing machine. The outer cylinder placement seat is composed of a bottom mounting plate 1-1 and a support seat 1-2 integrally connected to the mounting plate. The top of the support seat has a groove matching the end of the outer cylinder. The support seat in the groove has a guide hole for the inner cylinder to extend into. The bottom of the inner cylinder positioning seat has a positioning groove 2-1 matching the end of the inner cylinder with the induction temperature measuring port. A first through groove 2-2 is formed on one side of the positioning groove relative to the position of the induction temperature measuring port. During operation, the outer cylinder is first placed on the outer cylinder placement seat, and then the inner cylinder is placed on the outer cylinder. The inner cylinder is positioned manually using the inner cylinder positioning seat. The pressing machine is then started to press the inner cylinder into the outer cylinder, ensuring that one end of the inner cylinder passes through the outer cylinder. This invention employs this structure to achieve rapid press-fitting.

[0028] like Figure 4 The stretching fixture in step S4 includes a fixture base plate 3, a placement seat 4, a fixture top plate 5, an inner stretching head 6, and a stretching hydraulic cylinder. The fixture top plate is fixed directly above the fixture base plate by a column 8. The placement seat is placed on the fixture base plate and fixed to it with bolts. The top of the placement seat has a placement slot that matches the end cap of the refrigeration cylinder. The inner stretching head is located directly above the placement slot and is connected to the stretching hydraulic cylinder via a stretching rod 7. The fixture top plate has a slot for the inner stretching head to pass through. A second slot is formed on the placement seat on one side of the slot, relative to the position of the induction temperature measuring port. During operation, the press-fitted refrigeration cylinder is first placed on the placement seat. Then, the stretching hydraulic cylinder is activated to insert the inner stretching head into the inner cylinder. Utilizing the characteristic that the inner stretching head is larger than the inner diameter of the inner cylinder, the inner cylinder is stretched, causing its outer wall to fully conform to the inner wall of the outer cylinder. This invention welds the inner and outer cylinders after stretching, ensuring the integrity of the weld and making the connection between the inner and outer cylinders more secure.

[0029] like Figure 5 A refrigeration cylinder limiting plate 9 is installed on the tooling base plate in the channel shown. A limiting protrusion 10, which is integrated with the refrigeration cylinder limiting plate, is provided at the center of the limiting plate. A limiting connecting groove matching the limiting protrusion is provided on the end cap of the refrigeration cylinder. This design of the present invention prevents the refrigeration cylinder from deflecting during the stretching process, thus ensuring the stability of the stretching.

[0030] After the inner cylinder and outer cylinder are welded and fixed in step S5 above, the feed pipe 11-1, liquid inlet pipe 12-1, air outlet pipe 12-2 and induction temperature measuring connector 12-3 are welded and fixed in sequence at the cut hole positions on the inner cylinder and outer cylinder.

[0031] After the induction temperature measuring connector on the inner cylinder is welded, the flange structure 13 is welded and fixed on the end away from the end cover.

[0032] In step S6 above, the airtightness test requires that the refrigeration cylinder not leak even at a pressure of 3.8 MPa. The specific test results are shown below:

[0033] Table 1: Air Tightness Test Table The above are merely preferred embodiments of the present invention, and the scope of protection of the present invention is not limited to the above embodiments. All technical solutions falling within the scope of the present invention's concept are within the scope of protection of the present invention. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principles of the present invention should be considered within the scope of protection of the present invention.

Claims

1. A welding process for connecting the inner and outer cylinders of a refrigeration cylinder for an ice maker, characterized in that: Specifically, the following steps are included: S1: Visual inspection: Workers observe the surfaces of the inner and outer cylinders to be processed, as well as the positions of the cut holes, to prevent the pressing of defective parts. S2: Cleaning: The press-fitted surfaces of the inner and outer cylinders are cleaned by blowing with a high-pressure air gun. S3: Press fitting: The cleaned inner cylinder is pressed into the outer cylinder by a press fitting machine and press fitting fixtures, with the lower end of the inner cylinder passing through the outer cylinder. S4: Inner cylinder stretching: Place the workpiece pressed in step S3 into the stretching fixture, and stretch the inner cylinder in the workpiece through the stretching fixture so that the outer wall of the inner cylinder is fully attached to the inner wall of the outer cylinder. S5: Welding: Using welding equipment, perform spiral welding around the stretched workpiece to completely fix the outer cylinder to the inner cylinder. S6: Inspection: The welded refrigeration cylinder is sent into the air tightness testing device for air tightness testing; S7: Polishing and Warehousing: The airtightness test qualified refrigeration cylinders are sent to the polishing machine for polishing, and then stored in the warehouse after polishing.

2. The welding process for connecting the inner and outer cylinders of a refrigeration cylinder for an ice maker according to claim 1, characterized in that: Before observing the surface of the inner and outer cylinders in step S1, holes are cut into them. First, a feeding port and a temperature sensing port are cut into the surface of the inner cylinder. Then, notches matching the temperature sensing port, as well as a liquid inlet and an air outlet, are cut into the surface of the outer cylinder in sequence.

3. The welding process for connecting the inner and outer cylinders of a refrigeration cylinder for an ice maker according to claim 1, characterized in that: The pressing fixture in step S3 consists of an outer cylinder placement seat (1) and an inner cylinder positioning seat (2). The outer cylinder placement seat is fixed on the worktable of the pressing machine. The inner cylinder positioning seat is connected to the lower pressing shaft end of the pressing machine. The outer cylinder placement seat is composed of a bottom mounting plate (1-1) and a support seat (1-2) integrated with it on the mounting plate. The top of the support seat has a groove that matches the end of the outer cylinder. The support seat in the groove has a guide hole for the inner cylinder to extend into. The bottom of the inner cylinder positioning seat has a positioning groove (2-1) that matches the end of the inner cylinder with the induction temperature measuring port. A first through groove (2-2) is opened on one side of the positioning groove relative to the position of the induction temperature measuring port.

4. The welding process for connecting the inner and outer cylinders of a refrigeration cylinder for an ice maker according to claim 3, characterized in that: The stretching fixture in step S4 includes a fixture base plate (3), a placement seat (4), a fixture top plate (5), an inner stretching head (6), and a stretching hydraulic cylinder (7). The fixture top plate is fixed above the fixture base plate by a column (8). The placement seat is placed on the fixture base plate and fixed to it by bolts. The top of the placement seat has a placement slot that matches the end cap of the refrigeration cylinder. The inner stretching head is located above the placement slot and connected to the output shaft end of the stretching hydraulic cylinder. The fixture top plate has a slot for the inner stretching head to pass through. A second slot is provided on the placement seat on one side of the slot, relative to the position of the induction temperature measuring port.

5. The welding process for connecting the inner and outer cylinders of a refrigeration cylinder for an ice maker according to claim 4, characterized in that: A refrigeration cylinder limiting plate (9) is installed on the tooling base plate in the through groove. A limiting protrusion (10) integrated with the refrigeration cylinder limiting plate is provided at the center. A limiting connecting groove matching the limiting protrusion is opened on the end cap of the refrigeration cylinder.

6. The welding process for connecting the inner and outer cylinders of a refrigeration cylinder for an ice maker according to claim 1, characterized in that: After the inner cylinder and outer cylinder are welded and fixed in step S5, the feed pipe (11-1), liquid inlet pipe (12-1), air outlet pipe (12-2), and induction temperature measuring connector (12-3) are welded and fixed in sequence at the cut hole positions on the inner cylinder and outer cylinder.

7. The welding process for connecting the inner and outer cylinders of a refrigeration cylinder for an ice maker according to claim 6, characterized in that: After the induction temperature measuring connector on the inner cylinder is welded, the flange structure (13) is welded and fixed on the end away from the end cover.

8. The welding process for connecting the inner and outer cylinders of a refrigeration cylinder for an ice maker according to claim 1, characterized in that: In step S6, the airtightness test requires that the refrigeration cylinder does not leak even under a pressure of 3.8 MPa.

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