Multifunctional ultrasonic fatigue testing machine

Abstract

The utility model discloses a multifunctional ultrasonic fatigue testing machine. The multifunctional ultrasonic fatigue testing machine comprises a main machine frame; the loading system comprises an ultrasonic system, a static loading system and a cooling system, the ultrasonic system comprises an ultrasonic generator, an ultrasonic transducer and an amplitude-change pole, the ultrasonic transducer is arranged on the main machine frame, the ultrasonic generator is electrically connected with the ultrasonic transducer, the amplitude-change pole is arranged on the main machine frame and connected with the output end of the ultrasonic transducer, and the static loading system is electrically connected with the static loading system. The static load system comprises a static load resonator, a static load clamp and a servo motor, the servo motor is arranged on the main machine frame, the static load clamp is arranged at the output end of the servo motor, and the cooling system is arranged on the main machine frame; the control system comprises a fatigue test controller and a computer, the fatigue test controller is electrically connected with the ultrasonic generator, and the fatigue test controller is in communication connection with the computer. According to the multifunctional ultrasonic fatigue testing machine, an electronic fatigue test, a low-frequency fatigue test and a static mechanical test can be carried out at the same time, and the multifunctionality of the ultrasonic fatigue testing machine is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of fatigue testing machines, and particularly relates to a multifunctional ultrasonic fatigue testing machine. Background Art

[0002] With the rapid development of modern industrial technology, the requirements for material properties are also getting higher and higher. Especially in high-end manufacturing fields such as aerospace, automotive, construction, and biomedicine, the fatigue properties of materials are directly related to the safety and service life of products. Therefore, the demand for fatigue performance testing of materials is becoming increasingly urgent. Traditional fatigue testing methods often have problems such as long testing cycles, high costs, and inaccurate results, making it difficult to meet the accuracy and rapidity requirements of modern industry for material property evaluation.

[0003] As a new type of fatigue testing equipment, an ultrasonic fatigue testing machine can perform high-frequency fatigue performance testing on materials in a short time by utilizing the vibration effect of ultrasonic waves. Compared with traditional methods, ultrasonic fatigue testing has the advantages of fast testing speed, accurate results, and small damage to specimens, so it has received extensive attention and application in the field of material property testing.

[0004] However, existing ultrasonic fatigue testing machines often have a single function and can only perform specific types of fatigue tests, including symmetric tension-compression, asymmetric tension-tension, cantilever bending, three-point bending, etc., and have poor adaptability to different materials. In addition, some equipment has problems such as complex operation and low automation during the testing process. Summary of the Utility Model

[0005] In order to solve the problem of single test type existing in the prior art, the present application provides a multifunctional ultrasonic fatigue testing machine.

[0006] To achieve the above object, the technical solution adopted in the present application is: a multifunctional ultrasonic fatigue testing machine, including: a mainframe frame; a loading system, the loading system includes an ultrasonic system, a static load system, and a cooling system, the ultrasonic system includes an ultrasonic generator, an ultrasonic transducer, and a horn, the ultrasonic transducer is arranged on the mainframe frame, the ultrasonic generator is electrically connected to the ultrasonic transducer, the horn is arranged on the mainframe frame, and the horn is connected to the output end of the ultrasonic transducer, the static load system includes a static load resonator, a static load fixture, and a servo motor, the servo motor is arranged on the mainframe frame, the static load fixture is arranged at the output end of the servo motor, the static load resonator is arranged on the static load fixture, the cooling system is arranged on the mainframe frame, and the cooling system is used for cooling the specimen to be tested;

[0007] A control system, the control system includes a fatigue test controller and a computer, the fatigue test controller is electrically connected to the ultrasonic generator, and the fatigue test controller is communicatively connected to the computer.

[0008] In some embodiments of the present utility model, a load sensor is provided between the servo motor and the static load fixture. The load sensor is fixed to the output end of the servo motor, and the static load fixture is arranged on the load sensor.

[0009] In some embodiments of the present utility model, the mainframe frame includes an upper cross beam, guide columns, ball screws, a moving cross beam, a cross beam dragging block, and a workbench. One end of the guide column is arranged on the workbench, the upper cross beam is arranged at the end of the guide column away from the workbench, the ball screws are arranged between the workbench and the upper cross beam, the cross beam dragging block is slidably arranged on the guide column, the cross beam dragging block is threadedly connected to the ball screws, the moving cross beam is arranged on the cross beam dragging block, and the amplitude-changing rod is arranged on the moving cross beam.

[0010] In some embodiments of the present utility model, an operation panel is arranged on the workbench, and the operation panel is electrically connected to the servo motor.

[0011] In some embodiments of the present utility model, a working indicator light and an emergency stop button are further arranged on the operation panel.

[0012] In some embodiments of the present utility model, the cooling system includes a fixed base, a vortex tube, and a cold air delivery pipe. The fixed base is arranged on the moving cross beam, the vortex tube is arranged on the fixed base, one end of the cold air delivery pipe is arranged on the vortex tube, and the other end of the cold air delivery pipe is aligned with the specimen to be tested.

[0013] In some embodiments of the present utility model, the cold air delivery pipe is a shapeable corrugated pipe.

[0014] Compared with the prior art, the beneficial effects of the present utility model are:

[0015] The utility model provides a multi-functional ultrasonic fatigue testing machine, which includes: a mainframe rack for installing and fixing a loading system, facilitating the coordinated operation of various functional components in the loading system to conduct various different fatigue tests. The above-mentioned loading system includes an ultrasonic system, a static load system, and a cooling system. The ultrasonic system includes an ultrasonic generator, an ultrasonic transducer, and a horn. The above-mentioned ultrasonic transducer is arranged on the mainframe rack, the ultrasonic generator is electrically connected to the ultrasonic transducer, the horn is arranged on the mainframe rack, and the horn is connected to the output end of the ultrasonic transducer. The above-mentioned ultrasonic generator is used to convert a voltage signal into a high-frequency sinusoidal electrical signal, and the above-mentioned ultrasonic transducer is used to convert the high-frequency electrical signal generated by the ultrasonic generator into high-frequency mechanical vibration. The above-mentioned horn is used to adjust and control the amplitude of ultrasonic waves. By adjusting its internal mechanical structure, the horn can change the amplitude of the input signal, thereby achieving precise adjustment of parameters such as the intensity, power, and energy of ultrasonic waves. Through the fixation of the specimen by the above-mentioned ultrasonic system and cooperation with the static load system, a low-frequency fatigue test is carried out to enhance the versatility of the fatigue testing machine. The above-mentioned static load system includes a static load resonator, a static load fixture, and a servo motor. The servo motor is arranged on the mainframe rack, the static load fixture is arranged at the output end of the servo motor, and the static load resonator is arranged on the static load fixture. The above-mentioned static load resonator is used to generate and maintain a stable static load. By precisely controlling the vibration frequency and amplitude of the static load resonator, the static stress borne by the material during long-term use can be simulated, thereby evaluating its fatigue performance. The main function of the above-mentioned static load fixture is to clamp and fix the specimen to ensure that the specimen maintains a stable position during the test. The above-mentioned servo motor is used to provide power and control the loading process during the fatigue test. By precisely controlling the rotation speed and torque of the motor, precise loading of the specimen can be achieved, simulating various complex fatigue loading conditions. The high performance and high precision of the servo motor ensure the stability and accuracy of the loading process, thereby improving the reliability of the test results. The above-mentioned cooling system is arranged on the mainframe rack, and the cooling system is used for cooling the specimen to be tested. The above-mentioned control system includes a fatigue test controller and a computer. The fatigue test controller is electrically connected to the ultrasonic generator, and the fatigue test controller and the computer are communicatively connected. The above-mentioned fatigue test controller is used to accurately control the actions of the test equipment under the command of the upper computer software to ensure that the test process proceeds according to the preset procedures and parameters. And the fatigue test controller real-time collects the forces, deformations, and other possible physical quantity changes generated on the specimen during the test process. In the system, the controller can feedback the collected physical quantity changes to the control according to the control algorithm, thereby achieving real-time adjustment and optimization of the test process. The above-mentioned computer is used for data processing and analysis. The computer has powerful data processing capabilities and can perform real-time processing, analysis, and storage of the data collected during the test process.And it can be displayed and operated on the interface. Through the computer interface, the operator can conveniently set test parameters, monitor the test process, view test results, etc. One end of the specimen is connected to the ultrasonic system, and the other end is connected to the static load system. The ultrasonic system and the static load system are respectively connected to the fatigue experiment controller and the computer in the control system, and the specimen is controlled to perform static mechanical tests such as symmetric tension-compression, asymmetric tension-tension, and cantilever bending through the fatigue control software.

[0016] Therefore, this multifunctional ultrasonic fatigue testing machine can simultaneously conduct electronic fatigue tests, low-frequency fatigue tests, and static mechanical tests, improving the versatility of the ultrasonic fatigue testing machine. Brief Description of the Drawings

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present application. For those skilled in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0018] Figure 1 It is a schematic structural diagram of an embodiment of the present utility model;

[0019] Figure 2 It is a schematic internal structure diagram of an embodiment of the present utility model;

[0020] Figure 3 It is a schematic structural diagram of the cooling system of an embodiment of the present utility model.

[0021] In the figure: 1 - guiding column; 2 - ultrasonic generator; 3 - ultrasonic transducer; 4 - horn; 5 - static load resonator; 6 - static load fixture; 7 - servo motor; 8 - fatigue experiment controller; 9 - computer; 10 - upper crossbeam; 11 - ball screw; 12 - moving crossbeam; 13 - crossbeam dragging block; 14 - workbench; 15 - operation panel; 16 - working indicator light; 17 - emergency stop button; 18 - fixed base; 19 - vortex tube; 20 - cold air delivery pipe; 21 - load sensor; 22 - specimen. Detailed Embodiments

[0022] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some, but not all, of the embodiments of the present application. Usually, the components of the embodiments of the present application described and illustrated in the drawings here can be arranged and designed in various different configurations.

[0023] Accordingly, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the claimed present application, but merely represents selected embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative efforts fall within the scope of protection of the present application.

[0024] It should be noted that like reference numerals and letters denote like items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0025] In the description of the present application, it should be noted that if terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are used to indicate the orientation or positional relationship, it is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of this application is usually placed during use. This is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present application. In addition, in the description of the present application, if terms such as "first", "second", etc. are used only for distinguishing descriptions, they cannot be understood as indicating or implying relative importance.

[0026] In addition, in the description of the present application, terms such as "horizontal" and "vertical" do not mean that the components are required to be absolutely horizontal or hanging vertically, but can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0027] In the description of the present application, it should also be noted that unless otherwise clearly specified and limited, if terms such as "set", "installed", "connected", "connected" are used, they should be understood in a broad sense. 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 directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific situations.

[0028] Embodiment

[0029] Please refer to Figures 1 - 3 , this embodiment provides a multifunctional ultrasonic fatigue testing machine, including: a mainframe frame for installing and fixing a loading system, facilitating the coordinated action of various functional components in the loading system to perform various different fatigue tests.

[0030] In this embodiment, the above loading system includes an ultrasonic system, a static load system, and a cooling system. The ultrasonic system includes an ultrasonic generator 2, an ultrasonic transducer 3, and a horn 4. The above ultrasonic transducer 3 is arranged on the mainframe rack. The ultrasonic generator 2 is electrically connected to the ultrasonic transducer 3. The horn 4 is arranged on the mainframe rack, and the horn 4 is connected to the output end of the ultrasonic transducer 3. The above ultrasonic generator is used to convert a voltage signal into a high-frequency sinusoidal electrical signal. The above ultrasonic transducer is used to convert the high-frequency electrical signal generated by the ultrasonic generator into high-frequency mechanical vibration. The above horn 4 is used to adjust and control the amplitude of the ultrasonic wave. By adjusting its internal mechanical structure, the horn 4 can change the amplitude of the input signal, so as to achieve precise adjustment of parameters such as the intensity, power, and energy of the ultrasonic wave. Through the fixation of the specimen 22 by the above ultrasonic system and cooperation with the static load system for low-frequency fatigue tests, the versatility of the fatigue testing machine is improved.

[0031] In this embodiment, the above static load system includes a static load resonator 5, a static load fixture 6, and a servo motor 7. The servo motor 7 is arranged on the mainframe rack. The static load fixture 6 is arranged at the output end of the servo motor 7. The static load resonator 5 is arranged on the static load fixture 6. The above static load resonator 5 is used to generate and maintain a stable static load. By precisely controlling the vibration frequency and amplitude of the static load resonator 5, the static stress borne by the material during long-term use can be simulated, so as to evaluate its fatigue performance. The main function of the above static load fixture 6 is to clamp and fix the specimen 22 to ensure that the specimen 22 maintains a stable position during the test. The above servo motor 7 is used to provide power and control the loading process during the fatigue test. By precisely controlling the rotation speed and torque of the motor, precise loading of the specimen 22 can be achieved, simulating various complex fatigue loading conditions. The high performance and high precision of the servo motor 7 ensure the stability and accuracy of the loading process, thus improving the reliability of the test results.

[0032] In this embodiment, the above cooling system is arranged on the mainframe rack, and the cooling system is used for cooling the specimen 22 to be tested.

[0033] In this embodiment, the above control system includes a fatigue test controller 8 and a computer 9. The fatigue test controller is electrically connected to the ultrasonic generator 2, and the fatigue test controller 8 and the computer 9 are communicatively connected. The above fatigue test controller 8 is used to accurately control the actions of the test equipment under the command of the host computer software, ensuring that the test process proceeds according to the preset procedures and parameters. And the fatigue test controller 8 real-time collects the forces, deformations, and other possible physical quantity changes generated on the specimen 22 during the test process. In the system, the controller can feedback the collected physical quantity changes to the control according to the control algorithm, thereby realizing the real-time adjustment and optimization of the test process. The above computer 9 is used for data processing and analysis. The computer 9 has powerful data processing capabilities and can perform real-time processing, analysis, and storage of the data collected during the test process. And it can be displayed and operated through the interface. Through the computer 9 interface, the operator can conveniently set test parameters, monitor the test process, view test results, etc.

[0034] It should be noted that one end of the specimen 22 is connected to the ultrasonic system, and the other end is connected to the static load system. The ultrasonic system and the static load system are respectively connected to the fatigue test controller 8 and the computer 9 in the control system. The specimen 22 is controlled to perform static mechanical tests such as symmetric tension-compression, asymmetric tension-tension, and cantilever bending through the fatigue control software.

[0035] Please refer to Figure 1 and Figure 2 , in some embodiments of the present utility model, a load sensor 21 is provided between the above servo motor 7 and the static load fixture 6. The load sensor 21 is fixed to the output end of the servo motor 7, and the static load fixture 6 is provided on the load sensor 21.

[0036] In this embodiment, the above load sensor 21 is used to accurately measure and feedback the magnitude and direction of the load borne by the specimen 22, and through the coordinated work with the servo motor 7, the load sensor 21 can real-time monitor and adjust the loading conditions during the test process.

[0037] Please refer to Figure 1 and Figure 2 , in some embodiments of the present utility model, the above host frame includes an upper cross beam 10, a guiding column 1, a ball screw 11, a moving cross beam 12, a cross beam dragging block 13, and a workbench 14. One end of the guiding column 1 is provided on the workbench 14, the upper cross beam 10 is provided at the end of the guiding column 1 away from the workbench 14, the ball screw 11 is provided between the workbench 14 and the upper cross beam 10, the cross beam dragging block 13 is slidably provided on the guiding column 1, the cross beam dragging block 13 is threadedly connected to the ball screw 11, the moving cross beam 12 is provided on the cross beam dragging block 13, and the horn 4 is provided on the moving cross beam 12.

[0038] In this embodiment, the upper crossbeam 10, the guiding columns 1, and the workbench 14 form a stable support framework for bearing the longitudinal displacement of the moving crossbeam 12. A series of static mechanical tests can be carried out by changing the distance between the moving crossbeam 12 and the static load fixture 6, which also facilitates the replacement of test specimens 22 of different lengths by the static load system and the ultrasonic system. The crossbeam dragging block 13 is used to move longitudinally under the action of the ball screw 11. By rotating the screw rod to drive the crossbeam dragging block 13, the moving crossbeam 12 can be reciprocated longitudinally on the guiding columns 1.

[0039] Please refer to Figure 1 , in some embodiments of the present utility model, an operation panel 15 is provided on the workbench 14, and the operation panel 15 is electrically connected to the servo motor 7.

[0040] In this embodiment, the operation panel 15 includes a display screen for displaying relevant information about the current position of the machine, as well as real-time information related to the test status, parameter settings, etc. This enables the operator to understand the progress and status of the test at any time, so as to make necessary adjustments or interventions.

[0041] Please refer to Figure 1 , in some embodiments of the present utility model, a working indicator light 16 and an emergency stop button 17 are further provided on the operation panel 15.

[0042] In this embodiment, the main function of the working indicator light 16 is to provide real-time visual feedback on the equipment status to indicate different working states of the equipment. When the status of the machine tool changes, the machine tool operation lamp will immediately respond and display the corresponding indicator light, enabling the operator to notice in time and make corresponding handling. The real-time feedback helps the operator better manage and control the operation of the machine tool, improve work efficiency, and reduce the occurrence of errors and failures.

[0043] In this embodiment, the emergency stop button 17 is a device for emergency braking and stopping the machine. When emergencies such as sudden equipment failures, operation mistakes, or personnel injuries occur, the operator can quickly press the emergency stop button 17 to stop the equipment instantly, thereby preventing the occurrence of dangerous accidents and ensuring the safety of personnel and equipment.

[0044] Please refer to Figures 1 - 3 , in some embodiments of the present utility model, the cooling system includes a fixed base 18, a vortex tube 19, and a cold air delivery pipe 20. The fixed base 18 is arranged on the moving crossbeam 12, the vortex tube 19 is arranged on the fixed base 18, one end of the cold air delivery pipe 20 is arranged on the vortex tube 19, and the other end of the cold air delivery pipe 20 is aligned with the specimen to be tested 22.

[0045] It should be noted that during the fatigue test, the specimen 22 will generate heat due to repeated mechanical stress or strain, resulting in a temperature increase. The temperature increase will have a negative impact on the performance of the specimen 22 and may even cause damage to the specimen 22 or test failure.

[0046] Specifically, the above-mentioned fixed base 18 is used to install the cooling system on the moving crossbeam 12, facilitating the movement of the cold air delivery pipe 20 following the moving crossbeam 12 under test conditions, so as to keep the cold air delivery pipe 20 always aligned with the experimental specimen 22. The above-mentioned vortex tube 19 is used to output high-pressure low-temperature air. The vortex tube 19 can efficiently take away the heat generated by the specimen 22, preventing the specimen 22 from being damaged due to temperature increase. The above-mentioned cold air delivery pipe 20 is used to accurately deliver the cold air output by the vortex tube 19 to the surface of the specimen 22, enhancing the cooling effect.

[0047] Please refer to Figure 1 and Figure 3 , in some embodiments of the present utility model, the above-mentioned cold air delivery pipe 20 is a shapeable corrugated pipe.

[0048] In this embodiment, the above-mentioned cold air delivery pipe 20 adopts a shapeable corrugated pipe. The shapeable corrugated pipe can maintain a specific shape and can adapt to different shapes and curvatures when needed. The shapeable corrugated pipe can be adjusted according to the different cooling points of the specimen 22, facilitating the accurate delivery of low-temperature air and further enhancing the cooling effect.

[0049] During use, when it is necessary to perform static mechanical tests such as symmetric tension-compression, asymmetric tension-tension, and cantilever bending on the specimen 22 through the fatigue control software, one end of the specimen 22 to be tested is connected to the ultrasonic system, and the other end of the specimen 22 to be tested is connected to the static load system. The ultrasonic system and the static load system are respectively connected to the fatigue test controller 8 and the computer 9 in the control system. After adjusting the test parameters, the test results can be obtained through the computer 9;

[0050] During the electronic fatigue test and the low-frequency fatigue test, one end of the specimen 22 to be tested is fixed on the ultrasonic system, and then the other end of the specimen 22 to be tested is fixed on the static load system. The test parameters of the static load system are debugged, and the ultrasonic system is turned off to obtain the test data.

[0051] The above are only the preferred embodiments of the present application and are not used to limit the present application. For those skilled in the art, various changes and modifications can be made to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A multi-functional ultrasonic fatigue testing machine, characterized in that, Comprising: Mainframe rack; Loading system, the loading system includes an ultrasonic system, a static load system and a cooling system. The ultrasonic system includes an ultrasonic generator (2), an ultrasonic transducer (3) and a horn (4). The ultrasonic transducer (3) is arranged on the mainframe rack. The ultrasonic generator (2) is electrically connected to the ultrasonic transducer (3). The horn (4) is arranged on the mainframe rack and is connected to the output end of the ultrasonic transducer (3). The static load system includes a static load resonator (5), a static load fixture (6) and a servo motor (7). The servo motor (7) is arranged on the mainframe rack. The static load fixture (6) is arranged at the output end of the servo motor (7). The static load resonator (5) is arranged on the static load fixture (6). The cooling system is arranged on the mainframe rack and is used for cooling the specimen to be tested; Control system, the control system includes a fatigue test controller (8) and a computer (9). The fatigue test controller is electrically connected to the ultrasonic generator (2). The fatigue test controller (8) and the computer (9) are communicatively connected.

2. The multifunctional ultrasonic fatigue testing machine according to claim 1, wherein A load sensor (21) is arranged between the servo motor (7) and the static load fixture (6). The load sensor (21) is fixed at the output end of the servo motor (7). The static load fixture (6) is arranged on the load sensor (21).

3. The multifunctional ultrasonic fatigue testing machine according to claim 1, characterized in that The mainframe rack includes an upper cross beam (10), guide columns (1), ball screws (11), a moving cross beam (12), a cross beam dragging block (13) and a workbench (14). One end of the guide column (1) is arranged on the workbench (14). The upper cross beam (10) is arranged at the end of the guide column (1) away from the workbench (14). The ball screw (11) is arranged between the workbench (14) and the upper cross beam (10). The cross beam dragging block (13) is slidably arranged on the guide column (1). The cross beam dragging block (13) is threadedly connected to the ball screw (11). The moving cross beam (12) is arranged on the cross beam dragging block (13). The horn (4) is arranged on the moving cross beam (12).

4. The multifunctional ultrasonic fatigue testing machine according to claim 3, characterized in that, An operation panel (15) is arranged on the workbench (14). The operation panel (15) is electrically connected to the servo motor (7).

5. The multi-functional ultrasonic fatigue testing machine according to claim 4, characterized in that, A working indicator light (16) and an emergency stop button (17) are further arranged on the operation panel (15).

6. The multifunctional ultrasonic fatigue testing machine according to claim 3, wherein, The cooling system includes a fixed base (18), a vortex tube (19) and a cold air delivery pipe (20). The fixed base (18) is arranged on the moving cross beam (12). The vortex tube (19) is arranged on the fixed base (18). One end of the cold air delivery pipe (20) is arranged on the vortex tube (19). The other end of the cold air delivery pipe (20) is aligned with the specimen to be tested (22).

7. The multifunctional ultrasonic fatigue testing machine according to claim 6, wherein, The cold air delivery pipe (20) is a shapeable corrugated pipe.

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