Handheld laser machine

Abstract

The utility model provides a handheld laser machine which comprises a light path channel, a detection assembly and an insulation assembly, and the end portion of the light path channel is provided with a nozzle assembly. The detection assembly is arranged on the nozzle assembly and can extend into the nozzle assembly; the insulation assembly is arranged on the light path channel and can shield an electric signal outside the detection assembly. Thus, when the handheld laser machine works, the handheld laser machine can detect the distance between the focal point of laser and the workpiece to be machined, so that the distance is controlled, the distance between the focal point and the workpiece is proper, machining is facilitated, light emitting of the handheld laser machine can be stopped when the working condition is abnormal by controlling the distance, and the working efficiency is improved. And the safety of operators is ensured.

Description

Technical Field

[0001] The utility model relates to the field of laser machines, in particular to a handheld laser machine. Background Art

[0002] With the continuous development of the laser industry, handheld laser machines can perform welding, cleaning, cutting and other operations, and are widely used in various fields.

[0003] In the related technology, since the distance between the focal point and the workpiece of a handheld laser machine cannot be measured, the distance between the focal point and the workpiece is difficult to control. In actual applications, the cutting process is often not ideal. If the distance between the focal point and the workpiece is too far or too close, the cutting gap of the handheld laser machine will be inconsistent during the cutting operation, and there is even a risk of accidental injury to the human body.

[0004] Therefore, current handheld laser machines still have the problem that the distance between the focus and the workpiece cannot be measured and is difficult to control. Utility Model Content

[0005] In order to overcome the deficiencies in the prior art, the utility model provides a handheld laser machine.

[0006] The embodiment of the utility model is achieved as follows:

[0007] A handheld laser machine includes an optical path channel, a detection component, and an insulating component. A nozzle component is arranged at the end of the optical path channel; the detection component is arranged on the nozzle component and can extend into the nozzle component; the insulating component is arranged on the optical path channel, and the insulating component can shield the electrical signal outside the detection component.

[0008] Furthermore, the nozzle assembly includes a nozzle, a core seat and a shell, the nozzle is installed at one end of the core seat, and the other end of the core seat is installed on the optical path; the shell is sleeved on the core seat, and the shell can be detachably connected to the core seat.

[0009] Furthermore, a characteristic hole is provided on the shell, and the detection component is installed in the characteristic hole.

[0010] Furthermore, the detection assembly includes a detection joint and an elastic member, the detection joint is installed in the characteristic hole, and the elastic member is sleeved on the detection joint and abuts against the characteristic hole.

[0011] Furthermore, the inner wall of the elastic member can abut against the detection joint, and the outer wall of the elastic member can abut against the side wall of the characteristic hole.

[0012] Furthermore, the insulating assembly comprises an upper insulating compression sleeve and a lower insulating spacer, wherein the upper insulating compression sleeve is arranged on one side of the detection assembly, and the lower insulating spacer is arranged on the other side of the detection assembly.

[0013] Furthermore, the nozzle assembly also includes a positioning block, which is detachably installed between the optical path and the core seat; the upper insulating sleeve is arranged between the positioning block and the core seat.

[0014] Furthermore, an annular groove is provided on the side of the core seat close to the positioning block, the upper insulating sleeve is installed in the annular groove, and the positioning block can abut against the upper insulating sleeve.

[0015] Furthermore, an annular step is provided on the core seat, and the annular step is provided on a side of the detection component away from the optical path, and the lower insulating spacer can be detachably installed in the annular step.

[0016] Furthermore, a positioning component is also provided on the core seat, a positioning groove is provided on the lower insulating pad, the positioning component is passed through the positioning groove, and can be detachably mounted on the core seat.

[0017] Furthermore, sealing rings are provided between the nozzle assembly, the detection assembly and the insulation assembly.

[0018] The beneficial effects of the embodiments of the utility model are:

[0019] The handheld laser machine provided by the utility model includes an optical path channel, a detection component, and an insulating component. A nozzle component is arranged at the end of the optical path channel; the detection component is arranged on the nozzle component and can be inserted into the nozzle component; the insulating component is arranged on the optical path channel, and the insulating component can shield the capacitance outside the detection component. In this way, when using the handheld laser machine provided by this embodiment, when a laser passes through the optical path channel and passes through the nozzle component and is ejected from the nozzle component, the detection component can be inserted into the nozzle component to collect the electrical signal between the nozzle component and the workpiece, thereby calculating the distance between the focus of the laser ejected from the nozzle component and the workpiece to be processed through the collected electrical signal. The insulating component can shield the electrical signal outside the detection component, making the electrical signal detected by the detection component more stable, avoiding interference to the detection component, and improving the stability of the detection.

[0020] After the distance between the focus of the laser and the workpiece to be processed is measured by the detection component, the distance between the focus and the workpiece can be controlled by controlling the optical path channel and the nozzle component to move away from or close to the workpiece to be processed, so that the laser processing effect ejected by the nozzle component is better and safer; in addition, by monitoring the distance, the handheld laser machine provided by the utility model can be prevented from emitting light when the working condition is abnormal, thereby improving the safety of the operator. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 It is a structural schematic diagram of a handheld laser machine of the utility model from one perspective;

[0023] Figure 2 It is a structural schematic diagram of the handheld laser machine of the utility model from another perspective;

[0024] Figure 3 The figure is a half-section structural schematic diagram of the handheld laser machine of the present invention from one viewing angle.

[0025] icon:

[0026] 100-machine body; 110-optical path channel; 200-nozzle assembly; 210-core seat; 220-housing; 230-connecting seat; 240-nozzle; 250-positioning block; 300-detection assembly; 310-detection connector; 320-elastic part; 400-insulation assembly; 410-upper insulation sleeve; 420-lower insulation pad. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0028] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0030] In the description of the present utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate the orientation or position relationship based on the orientation or position relationship shown in the accompanying drawings, or the orientation or position relationship in which the utility model product is usually placed when in use, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply 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 on the present utility model. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0031] In addition, the terms "horizontal", "vertical" and the like do not mean that the components are required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0032] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" 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 a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] Example 1

[0034] This embodiment provides a handheld laser machine to solve the problem in the related art that the distance between the focus of the handheld laser machine and the workpiece to be processed cannot be measured and is difficult to control.

[0035] like Figures 1 to 3As shown, the handheld laser machine includes an optical path channel 110, a detection component 300, and an insulating component 400. A nozzle component 200 is arranged at the end of the optical path channel 110; the detection component 300 is arranged on the nozzle component 200 and can extend into the nozzle component 200; the insulating component 400 is arranged on the optical path channel 110, and the insulating component 400 can shield the electrical signals outside the detection component 300.

[0036] Specifically, when the handheld laser machine is in use, the laser passing through the optical path channel 110 is ejected from the nozzle assembly 200. The focus of the laser in the optical path channel 110 can be adjusted and determined during the production process. After the determination is completed, the detection assembly 300 is set on the nozzle assembly 200. The detection assembly 300 can detect the electrical signal between the focus of the laser and the workpiece to be processed. Specifically, it can detect the capacitance value between the focus and the workpiece. After the capacitance value is measured, the distance between the focus and the workpiece can be obtained through calculation. The insulating assembly 400 can shield the electrical signal outside the detection assembly 300, that is, it can prevent the electrical signal outside the detection assembly 300 from interfering with the detection assembly 300, making the test process more stable.

[0037] By measuring the capacitance value between the focus and the workpiece and calculating the distance between the focus and the workpiece, the distance between the focus and the workpiece can be controlled by controlling the optical path channel 110 to move away from or close to the workpiece, so that the distance between the focus and the workpiece is stable at a suitable position, avoiding distance fluctuations that may reduce the workpiece processing quality, and preventing safety hazards caused by inappropriate distances between the focus and the workpiece, thereby improving processing quality and processing safety. In addition, by monitoring the distance, the handheld laser machine can stop emitting light in time when it is mistakenly aimed at a human body or other dangerous objects, thereby ensuring the safety of the operator.

[0038] In one embodiment, for example, Figure 2 , Figure 3As shown, the nozzle assembly 200 includes a nozzle 240, a core seat 210 and a housing 220. The nozzle 240 is installed at one end of the core seat 210, and the other end of the core seat 210 is installed on the optical path channel 110. The housing 220 is sleeved on the core seat 210, and the housing 220 can be detachably connected to the core seat 210. When the laser flows out of the optical path channel 110, the laser passes through the optical path channel 110, the core seat 210, and the nozzle 240 in sequence, and is ejected from the nozzle 240 to process the workpiece to be processed. The nozzle 240 is connected to the optical path channel 110 through the core seat 210. On the one hand, the difficulty of installing the nozzle 240 is reduced, and the nozzle 240 is easy to install. On the other hand, the optical path channel 110 can also be protected by the nozzle 240 and the core seat 210, extending the distance between the optical path channel 110 and the nozzle 240, and preventing the laser ejected from the nozzle 240 from splashing debris entering the optical path channel 110 when processing the workpiece; in addition, the shell 220 is arranged on the outside of the nozzle 240 and the core seat 210, and can add another layer of protection to ensure the reliability of the core seat 210 and the nozzle 240.

[0039] In one embodiment, illustratively, the nozzle 240 can be detachably mounted on the inner wall of the core base 210. A connecting seat 230 is also provided outside the nozzle 240, and the nozzle 240 can be sleeved inside the connecting seat 230, and the connecting seat 230 can be detachably mounted on the outer wall of the core base 210. In this way, during actual production and installation, the nozzle 240 is first installed on the core base 210, and then the connecting seat 230 is sleeved outside the nozzle 240, and then the connecting seat 230 is installed on the core base 210. Through the connection between the nozzle 240 and the core base 210, and the further connection between the connecting seat 230 and the core base 210, the installation strength between the nozzle 240 and the core base 210 is improved, making this embodiment more reliable. In addition, the connecting seat 230 is arranged outside the nozzle 240, and can also protect the nozzle 240 to prevent the nozzle 240 from being damaged from the outside.

[0040] It is understandable that the connection method between the nozzle 240 and the core seat 210, and between the connecting seat 230 and the core seat 210 can be selected according to actual production needs. For example, an external thread is set on the outer wall of the nozzle 240, and an internal thread is set on the inner wall of the core seat 210, and the nozzle 240 and the core seat 210 are connected by threaded matching; an internal thread is set on the inner wall of the connecting seat 230, and an external thread is set on the outer wall of the core seat 210, and the connecting seat 230 and the core seat 210 can also be connected by threaded matching; or, after the nozzle 240 is placed in a suitable position on the core seat 210, it is fixed by bolt connection, and then the connecting seat 230 is sleeved on the outside of the nozzle 240 and fixed by bolt connection, as long as the nozzle 240, the core seat 210, and the connecting seat 230 can be fixed reliably.

[0041] In one embodiment, for example, Figure 3 As shown, a characteristic hole is provided on the housing 220, and the detection assembly 300 is installed in the characteristic hole. By providing the characteristic hole on the housing 220, the detection assembly 300 can be stably and reliably installed on the housing 220, so that the detection assembly 300 can detect the electrical signal between the focus and the workpiece.

[0042] It is worth noting that a detection hole is also provided on the core base 210, and the detection component 300 is inserted into the characteristic hole and extends into the detection hole. By providing the detection hole, the distance between the detection component 300 and the laser is shortened, which facilitates the detection operation of the detection component 300, reduces the detection difficulty, and improves the detection accuracy.

[0043] In one embodiment, for example, Figure 3 As shown, the detection assembly 300 includes a detection connector 310 and an elastic member 320. The detection connector 310 is installed in the characteristic hole, and the elastic member 320 is sleeved on the detection connector 310 and abuts against the characteristic hole. The detection connector 310 is inserted into the characteristic hole, and the elastic member 320 is sleeved on the detection connector 310, and at the same time, the elastic member 320 also abuts against the characteristic hole, that is, the contact area between the detection connector 310 and the characteristic hole is expanded by the elastic member 320, so that the detection connector 310 has a better reception effect on the electrical signal, reduces the detection difficulty, and also improves the detection accuracy of the detection connector 310.

[0044] It should be noted that the detection connector 310 can flexibly adopt different connectors according to different use environments and working environments, as long as the electrical signal can be detected and the detected data can be transmitted. Correspondingly, the elastic member 320 can also select different elastic members 320 according to different working environments and different detection connectors 310, as long as it can play the effect of expanding the contact area between the detection connector 310 and the characteristic hole and improving the detection accuracy of the detection connector 310. For example, when the detection connector 310 adopts an SMA type connector (SubMiniature version A type connector), the elastic member 320 can adopt a crown spring; in this way, when in use, one end of the SMA connector abuts against the characteristic hole, and the contact area between the SMA connector and the characteristic hole is expanded by the crown spring, and the other end of the SMA is connected to the operation center, and the measured electrical signal is transmitted to the operation center, and then the operation center calculates the distance between the focus of the laser and the workpiece to be processed. It is easy to use, the detection result is accurate, and the SMA connector has strong versatility, which improves the practicality of this embodiment.

[0045] In one embodiment, for example, the inner wall of the elastic member 320 can abut against the detection joint 310, and the outer wall of the elastic member 320 can abut against the side wall of the characteristic hole. By controlling the diameter and type of the elastic member 320, the elastic member 320 can abut against the detection joint 310 and the inner wall of the characteristic hole at the same time, which can further expand the contact area between the detection joint 310 and the characteristic hole and improve the detection accuracy.

[0046] In one embodiment, for example, Figure 3 As shown, the insulating assembly 400 includes an upper insulating sleeve 410 and a lower insulating spacer 420, wherein the upper insulating sleeve 410 is arranged on one side of the detection assembly 300, and the lower insulating spacer 420 is arranged on the other side of the detection assembly 300. The insulating assembly 400 is arranged on both the upper and lower sides of the detection assembly 300, which can effectively prevent the electrical signals outside the insulating assembly 400 from being mixed in the area to be detected, so that the electrical signals in the area between the upper insulating sleeve 410 and the lower insulating spacer 420 are more stable, which is convenient for the detection assembly 300 to measure.

[0047] In one embodiment, for example, Figure 3 As shown, the nozzle assembly 200 also includes a positioning block 250, which can be detachably installed between the optical path channel 110 and the core seat 210; the upper insulating sleeve 410 is arranged between the positioning block 250 and the core seat 210. By setting the positioning block 250, the installation process of the core seat 210 is simpler and easier to operate, and at the same time, the fixation of the upper insulating sleeve 410 is made more reliable; the upper insulating sleeve 410 is arranged between the positioning block 250 and the core seat 210. After the installation is completed, the positioning block 250 and the core seat 210 squeeze the upper insulating sleeve 410 to prevent the upper insulating sleeve 410 from shaking or displacement, thereby ensuring the insulation effect of the upper insulating sleeve 410.

[0048] In one embodiment, for example, Figure 3 As shown, a disc is provided on the end of the optical path channel 110 near the positioning block 250, the positioning block 250 is provided in a cylindrical shape, and a locking ring is rotatably provided on the positioning block 250, an external thread is provided at the edge of the disc, and an internal thread is provided inside the locking ring, and the disc and the positioning block 250 can be detachably connected by threaded cooperation, that is, the optical path channel 110 and the positioning block 250 can be detachably connected by threaded cooperation, thereby reducing the difficulty of installing the positioning block 250.

[0049] In one embodiment, for example, Figure 3As shown, an annular groove is provided on the side of the core base 210 near the positioning block 250, and the upper insulating sleeve 410 is installed in the annular groove, and the positioning block 250 can contact the upper insulating sleeve 410. The annular groove is provided on the core base 210. On the one hand, it is more convenient to install and position the upper insulating sleeve 410 to avoid errors in the installation process. On the other hand, it also prevents the upper insulating sleeve 410 from displacement and shaking after installation, which affects the protective effect of the upper insulating sleeve 410.

[0050] It is worth mentioning that the height of the annular groove is L1, and the thickness of the upper insulating sleeve 410 is L2, satisfying L1<L2. In this way, after the upper insulating sleeve 410 is installed in the annular groove, the upper insulating sleeve 410 will extend out of the annular groove, and when the core seat 210 and the positioning block 250 are installed, the positioning block 250 will abut against the upper insulating sleeve 410 and squeeze the upper insulating sleeve 410, thereby further preventing the upper insulating sleeve 410 from being displaced or shaken during use, so that the installation of the upper insulating sleeve 410 is reliable.

[0051] In one embodiment, for example, Figure 3 As shown, an annular step is provided on the core base 210, and the annular step is provided on the side of the detection component 300 away from the optical path channel 110, and the lower insulating pad 420 can be detachably installed in the annular step. The annular step is provided on the core base 210, which can position the lower insulating pad 420, making the installation of the lower insulating pad 420 simpler and easier to operate. In addition, the lower insulating pad 420 can cooperate with the upper insulating sleeve 410 on the core base 210 to protect the detection component 300 between the upper insulating sleeve 410 and the lower insulating pad 420, so that the electrical signal environment between the upper insulating sleeve 410 and the lower insulating pad 420 is more stable, which is convenient for the detection component 300 to measure.

[0052] In one embodiment, illustratively, a positioning component is also provided on the core base 210, and a positioning groove is provided on the lower insulating pad 420. The positioning component is inserted into the positioning groove and can be detachably installed on the core base 210. The positioning component is provided on the core base 210, so that the relative position between the core base 210 and the shell can be determined, which is convenient for the installation and disassembly between the core base 210 and the shell, and reduces the difficulty of installation between the core base 210 and the shell; in addition, the positioning groove is provided on the lower insulating pad 420, so that the lower insulating pad 420 can be fixed while the core base 210 and the shell are relatively fixed, so as to ensure that the lower insulating pad 420 will not be displaced or shaken during operation, so that it can better cooperate with the upper insulating sleeve 410, maintain the stability of the electrical signal between the upper insulating sleeve 410 and the lower insulating pad 420, and facilitate measurement.

[0053] Specifically, the positioning assembly includes a first positioning pin and a second positioning pin. Accordingly, two positioning grooves are opened on the lower insulating spacer 420, and fixing grooves are opened on the core seat 210 and the shell 220. The first positioning pin passes through the positioning groove on the lower insulating spacer 420 and extends into the fixing groove on the core seat 210. The second positioning pin passes through another positioning groove on the lower insulating spacer 420 and extends into the fixing groove on the shell 220. In this way, during installation, the position between the lower insulating pad 420 and the core seat 210 is first determined by the first positioning pin. After the determination is completed, the position of another positioning groove on the lower insulating pad 420 is determined, and then the shell is installed at the corresponding position so that the second positioning pin can pass through the positioning groove and extend into the fixed groove on the shell 220. That is, the positioning is completed. The first positioning pin and the second positioning pin can be used to determine the positional relationship between the shell 220 and the core seat 210, and the lower insulating pad 420 can also be completely limited to ensure that the lower insulating pad 420 will not be displaced or shaken during use; the positioning is reliable and the installation is convenient.

[0054] In one embodiment, for example, Figure 3 As shown, sealing rings are arranged between the nozzle assembly 200, the detection assembly 300, and the insulation assembly 400. By arranging sealing rings between the nozzle assembly 200, the detection assembly 300, and the insulation assembly 400, the internal working environment of the handheld laser machine provided in this embodiment can be separated from the external environment when in use, ensuring the internal environment to be stable and the working environment to be normal, while also preventing external air from entering the interior to affect the normal operation of the internal laser.

[0055] Specifically, sealing rings are provided between the positioning block 250, the core seat 210, the nozzle 240, and the connecting seat 230, that is, sealing rings are provided between each detachable component to ensure that the internal working environment can be separated from the external environment.

[0056] In one embodiment, for example, Figure 3 As shown, the channel inside the nozzle assembly 200 is arranged in an inverted bucket shape, so that when the laser passes through the optical path channel 110 for operation, the debris generated by the laser processing the workpiece can be effectively isolated from splashing into the nozzle 240, thereby protecting the various components in the nozzle 240.

[0057] In one embodiment, illustratively, the optical path channel 110 is installed on the body 100 .

[0058] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A handheld laser machine, characterized in that: include: An optical path channel, wherein a nozzle assembly is disposed at an end of the optical path channel; A detection assembly, the detection assembly is arranged on the nozzle assembly and can extend into the nozzle assembly; An insulating component is arranged on the optical path, and the insulating component can shield the electrical signal outside the detection component.

2. The handheld laser machine according to claim 1, characterized in that: The nozzle assembly comprises a nozzle, a core seat and a shell. The nozzle is mounted on one end of the core seat, and the other end of the core seat is mounted on the optical path. The shell is sleeved on the core seat, and the shell can be detachably connected to the core seat.

3. The handheld laser machine according to claim 2, characterized in that: The shell is provided with a characteristic hole, and the detection component is installed in the characteristic hole.

4. The handheld laser machine according to claim 3, characterized in that: The detection assembly comprises a detection joint and an elastic member. The detection joint is installed in the characteristic hole. The elastic member is sleeved on the detection joint and abuts against the characteristic hole.

5. The handheld laser machine according to claim 4, characterized in that: The inner wall of the elastic member can abut against the detection joint, and the outer wall of the elastic member can abut against the side wall of the characteristic hole.

6. The handheld laser machine according to claim 2, characterized in that: The insulating assembly comprises an upper insulating compression sleeve and a lower insulating spacer. The upper insulating compression sleeve is arranged on one side of the detection assembly, and the lower insulating spacer is arranged on the other side of the detection assembly.

7. The handheld laser machine according to claim 6, characterized in that: The nozzle assembly also includes a positioning block, which is detachably installed between the optical path and the core seat; the upper insulating sleeve is arranged between the positioning block and the core seat.

8. The handheld laser machine according to claim 7, characterized in that: An annular groove is provided on the side of the core seat close to the positioning block, the upper insulating sleeve is installed in the annular groove, and the positioning block can abut against the upper insulating sleeve.

9. The handheld laser machine according to claim 6, characterized in that: An annular step is arranged on the core seat, and the annular step is arranged on the side of the detection component away from the optical path channel, and the lower insulating pad can be detachably installed in the annular step.

10. The handheld laser machine according to claim 9, characterized in that: The core seat is also provided with a positioning assembly, the lower insulating pad is provided with a positioning groove, the positioning assembly is passed through the positioning groove, and can be detachably mounted on the core seat.

11. The handheld laser machine according to any one of claims 1 to 10, characterized in that: Sealing rings are arranged between the nozzle assembly, the detection assembly and the insulation assembly.

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