A dirt detection device for protective glass of laser-processed mirror assembly

Abstract

This utility model discloses a dirt detection device for protective glass in laser-processed lens assemblies. It includes a heat-conducting copper block, with one end penetrating the copper block and forming a hollow sliding shaft that abuts against it. A temperature sensor, in direct contact with the protective glass, is housed within the hollow sliding shaft. A leaf spring is engaged at the other end of the hollow sliding shaft and fixed via a leaf spring mounting seat. This leaf spring provides a clamping force within a compact space, ensuring contact between the temperature sensor and the protective glass. This dirt detection device can detect dirt on protective glass under strictly limited space conditions, significantly saving space. Furthermore, the protective lens assembly formed by this dirt detection device maintains radial sealing along the optical axis while compressing space. A heat insulation design is employed between the protective lens, the dirt detection device, and the outer shell, effectively preventing heat exchange between the lens and the shell from affecting the detection results.

Description

Technical Field

[0001] This utility model belongs to the field of protective glass technology for laser processing mirror assemblies, and particularly relates to a dirt detection device for protective glass of laser processing mirror assemblies. Background Technology

[0002] Laser processing (cutting, welding) often involves particulate matter splashes and fumes, which can damage laser processing lens assemblies. Protective glass is typically added to the outside of critical lenses (collimating lenses, focusing lenses) to isolate them from splashes and fumes. However, these protective glass sheets inevitably become contaminated during use and absorb additional light energy. If they are not replaced in time, it will affect processing quality and may even break down, exposing the protected lenses.

[0003] Existing technologies typically monitor the contamination status of the protective glass by adding sensors to the protective glass module near the molten pool of the focusing lens and feeding this information back to the system. However, the installation position of the protective glass module is close to the molten pool, and there are functional requirements in this area. Generally, the wire feeding device is arranged along the direction of the welding path, and the welding process gas jetting device is arranged behind the molten pool. The two sides of the welding path can be used for the installation of sensors in the protective glass module and the operation space for replacing the protective glass. However, when the laser processing lens assembly integrates a traveling pressure roller, its space is further limited. This is because the common types of sensors used for contamination detection are temperature sensors (resistance temperature detectors, thermocouples) and scattered light sensors (phototubes). Temperature sensors are generally mounted on a spring-loaded device to reliably fit with the protective glass lens and reduce air thermal resistance. The working distance of the spring requires a certain amount of space. Therefore, solutions using temperature sensors for contamination monitoring are relatively large and have high space requirements. For example, attached... Figure 1 In laser wire feeding welding using shielding gas, if a traveling pressure roller is used, the space in front of the welding mirror assembly (wire feeding device), behind it (shielding gas device), and on one side (pressure roller device) along the welding direction will be severely limited.

[0004] Therefore, there is an urgent need for a device that can detect dirt on protective glass under strictly limited space conditions. Utility Model Content

[0005] Purpose of the utility model: The technical problem to be solved by this utility model is to provide a dirt detection device for the protective glass of a laser processing mirror assembly. The dirt detection device can monitor and report the dirt status of the protective glass under the condition of strict space constraints of the laser processing mirror assembly.

[0006] Technical solution: This utility model is a dirt detection device for the protective glass of a laser-processed lens assembly. The dirt detection device includes a heat-conducting copper block, one end of which passes through the heat-conducting copper block and forms a hollow sliding shaft that abuts against it. A temperature sensor that is in direct contact with the protective glass is sleeved inside the hollow sliding shaft. A leaf spring is engaged at the other end of the hollow sliding shaft, and the leaf spring is connected and fixed by a leaf spring mounting seat so as to provide a clamping force in a compact space so that the temperature sensor contacts the protective glass.

[0007] Furthermore, the leaf spring mounting base of the contamination detection device is provided with round pins on both sides of the leaf spring along the vertical direction to position the leaf spring, and the leaf spring mounting base is provided with through holes for passing through the hollow sliding shaft.

[0008] Furthermore, a heat-insulating sliding sleeve is fitted onto the hollow sliding shaft of the contamination detection device.

[0009] Furthermore, one side of the heat-conducting copper block of the contamination detection device is in contact with the protective glass, and the contact surface is an arc-shaped surface that fits against it.

[0010] Furthermore, the heat-conducting copper block of the contamination detection device has a groove at the connection point with the hollow sliding shaft, and a movable connection is achieved through a heat-conducting T-shaped connecting copper block located on the heat-conducting copper block.

[0011] Furthermore, the contamination detection device also includes a housing, to which the other end of the temperature sensor extends and is connected to a signal electrical interface located on the housing.

[0012] The present invention relates to a protective glass module for a laser processing lens assembly. The protective glass module includes a base and a top cover module connected to the base, a drawer module slidably disposed in the base for placing the protective glass, and the aforementioned contamination detection device connected to the base and located on the opposite side of the drawer module. One side of the heat-conducting copper block of the contamination detection device is fitted to the protective glass.

[0013] Furthermore, the base of the protective glass module also contains a glass pressure plate located between the protective glass and the top cover module.

[0014] Furthermore, the base of the protective glass module is also equipped with PTFE heat-insulating and friction-reducing sealing rings and plugs located at the upper and lower ends of the protective glass.

[0015] Beneficial effects: Compared with the prior art, the advantages of this utility model are: the dirt detection device can meet the dirt detection of protective glass under strictly limited space conditions, and can be installed and used within a 60mm radius space in the laser optical axis field, which greatly saves the space; and the protective lens module composed of the dirt detection device can maintain the optical axis direction and radial sealing capability of the module while compressing the space. Attached Figure Description

[0016] Figure 1 A schematic diagram of a structure integrating a traveling pressure roller into a laser processing mirror assembly in this field;

[0017] Figure 2 This is a schematic diagram of the structure of the protective glass module of this utility model;

[0018] Figure 3 This is an exploded view of the protective glass module of this utility model;

[0019] Figure 4 A schematic diagram of the internal structure of the protective glass module;

[0020] Figure 5 For along Figure 2 A cross-sectional view;

[0021] Figure 6 This is a schematic diagram of the structure of the soiling detection device of this utility model;

[0022] Figure 7 This is an exploded view of the soiling detection device of this utility model. Detailed Implementation

[0023] The technical solution of this utility model will be further described in detail below with reference to the accompanying drawings.

[0024] The protective glass module of this utility model is as follows: Figure 2 and Figure 3 As shown, it includes a base 12, a drawer module 14 disposed within the base 12 for holding the protective glass 6, and a top cover module 13 disposed on the base 12. A glass pressure plate 15 is also provided within the base 12 between the drawer module 14 and the top cover module 13, and a PTFE sealing ring 18 is provided between the glass pressure plate 15 and the protective glass 6. A soiling detection device is connected to the opposite side of the drawer module 14 on the base 12, thereby monitoring and providing feedback on the soiling status of the protective glass 6.

[0025] The base 12 of the protective glass assembly is equipped with PTFE heat-insulating and friction-reducing sealing rings 16 and plug seals 17 on the upper and lower ends of the protective glass 6, respectively, to reduce the influence of the ambient environment on the temperature rise of the protective glass 6 and to accurately reflect the glass contamination status. Furthermore, sealing rings commonly used in the art can be installed between the upper cover module 13 of the protective glass assembly and the base 12, as well as between the contamination detection device and the base 12, to achieve comprehensive sealing measures in both the optical axis direction and the perpendicular optical axis direction, reducing the risk of dust entering and contaminating the assembly during long-term use.

[0026] Regarding the core contamination detection device of this utility model, it is as follows: Figures 4 to 7 As shown, the device includes a heat-conducting copper block 1 that is fitted to the protective glass 6. The side of the heat-conducting copper block 1 that contacts the protective glass 6 is curved, thus achieving a tight fit. A hollow sliding shaft 2 passes through the heat-conducting copper block 1 and abuts against it. A groove is formed on the heat-conducting copper block 1, and one end of the hollow sliding shaft 2 passes through this groove. The hollow sliding shaft 2 and the heat-conducting copper block 1 are connected by bolts via a T-shaped heat-conducting copper connecting block 9 located at the upper end of the heat-conducting copper block 1. A heat-insulating sleeve 8, which can be a low-resistance heat-insulating sleeve, is fitted onto the hollow sliding shaft 2. A temperature sensor 3 is fixedly installed inside the hollow sliding shaft 2, and one end of the temperature sensor 3 directly contacts the protective glass 6, eliminating the need for intermediate heat conduction devices, resulting in faster measurement response and space saving. At the other end of the hollow sliding shaft 2, i.e., the tail end, a leaf spring 4 is engaged. The leaf spring 4 provides clamping force within the compact space, causing the temperature sensor 3 to contact the protective glass 6. The heat-conducting copper block 1 assists in heat conduction, promoting thermal equilibrium between the temperature sensor 3 and the protective glass 6, thus reducing the space requirements in the working direction. The tail end of the hollow sliding shaft 2 can be provided with a slot to cooperate with the leaf spring 4, or a set of locking blocks can be extended from the tail end of the hollow sliding shaft 2 to cooperate with the leaf spring 4.

[0027] The leaf spring 4 is installed via a leaf spring mounting base 5 located at the tail end of the hollow sliding shaft 2. This mounting base 5 is connected to the base 12 via bolts. After the leaf spring mounting base 5 is fixed in place, the clamping force of the leaf spring 4 abuts against the hollow sliding shaft 2, thereby bringing the temperature sensor 3 into contact with the protective glass 6, ultimately achieving direct contact between the temperature sensor 3 and the protective lens 6. Correspondingly, the leaf spring mounting base 5 has a through hole for the tail end of the hollow sliding shaft 2 to pass through. Holes for housing the leaf springs can be provided at both ends of the leaf spring mounting base 5, and the two ends of the leaf spring 4 are positioned by pins 7 located at the left and right ends of the leaf spring mounting base 5.

[0028] In addition to the above, the dirt detection device of this invention also includes a housing 10, which further connects the dirt detection device and the base 12 of the protective glass assembly. The other end of the temperature sensor 3 extends to the housing 10 and is connected to the signal electrical interface 11 provided on the housing. Furthermore, the protective glass assembly of this invention effectively prevents heat exchange between the lens and the housing from affecting the detection results by, for example, incorporating components such as a heat-insulating sliding sleeve 8, a PTFE heat-insulating and friction-reducing sealing ring 16, and a sealing plug 17.

Claims

1. A device for detecting contamination of a protective glass of a laser machining mirror unit, characterized by, The contamination detection device includes a heat-conducting copper block (1), one end of which passes through the heat-conducting copper block (1) and forms a hollow sliding shaft (2) that abuts against it. A temperature sensor (3) that is in direct contact with the protective glass is sleeved inside the hollow sliding shaft (2). A leaf spring (4) is engaged at the other end of the hollow sliding shaft (2), and the leaf spring (4) is connected and fixed by a leaf spring mounting seat (5) so that the leaf spring (4) can provide a clamping force in a compact space so that the temperature sensor (3) can contact the protective glass (6).

2. The contamination detection device for a protective glass of a laser machining mirror unit according to claim 1, wherein The leaf spring mounting base (5) is provided with round pins (7) on both sides of the leaf spring (4) along the vertical direction to position the leaf spring (4). The leaf spring mounting base (5) is provided with through holes for passing through the hollow sliding shaft (2).

3. The contamination detection device for a protective glass of a laser machining mirror unit according to claim 1, wherein A heat-insulating sliding sleeve (8) is fitted onto the hollow sliding shaft (2).

4. The contamination detection device for a protective glass of a laser machining mirror unit according to claim 1, wherein One side of the heat-conducting copper block (1) is in contact with the protective glass (6), and the contact surface is an arc-shaped surface that fits against it.

5. The contamination detection device for the protective glass of the matching laser-processed lens assembly according to claim 1, characterized in that, The heat-conducting copper block (1) is provided with a groove at the connection point with the hollow sliding shaft (2), and is movably connected by a heat-conducting T-shaped copper connecting block (9) located on the heat-conducting copper block (1).

6. The contamination detection device for a protective glass of a laser machining mirror unit according to claim 1, wherein The contamination detection device also includes a housing (10), the other end of which extends to the housing (10) and is connected to a signal electrical interface (11) provided on the housing.

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