Measurement equipment protection device and three-dimensional digital photogrammetry equipment

Abstract

The invention provides a measuring equipment protection device and three-dimensional digital photogrammetry equipment. The measuring equipment protection device comprises an inner shell, an outer thermal insulation layer and a PLC (Programmable Logic Controller), the outer heat preservation layer wraps the outer surface of the inner shell to play a heat preservation role, the inner shell is a double-layer cylindrical metal tank arranged in the outer heat preservation layer, and the double-layer cylindrical metal tank is provided with an inner cavity and an outer cavity which are isolated from each other. Circulating dry compressed air and cooling liquid are introduced into the inner cavity and the outer cavity respectively, through a dynamic temperature control system of a PLC, accurate control over the temperature in the tank body is achieved, it is ensured that the working environment temperature of a camera is appropriate, efficient protection is provided for three-dimensional digital photogrammetry equipment under the extreme temperature condition, and the service life of the three-dimensional digital photogrammetry equipment is prolonged. And the normal working capability of the equipment in a severe environment is ensured.

Description

Technical Field

[0001] The invention relates to three-dimensional data acquisition, and in particular to a measuring equipment protection device and a three-dimensional digital photography measuring equipment used in an environment of -100°C to 130°C. Background Art

[0002] Three-dimensional digital photogrammetry technology has been widely used in many fields such as topographic mapping, industrial inspection, and cultural relics protection. Its core lies in using the high-precision shooting capabilities of camera equipment to capture and process image data to generate accurate three-dimensional models. However, this high-precision shooting has extremely high requirements for the working environment of the camera, especially in extreme temperature environments (such as extreme cold or extreme heat), the normal operation of the camera will face serious challenges. Camera equipment is usually designed to operate in a temperature range of 10℃ to 40℃. This is because outside this temperature range, the internal components of the camera, such as sensors, optical lenses, and electronic circuits, may be affected by temperature stress and cause performance degradation. Excessive temperature may cause sensor overheating, accelerated aging of electronic components, increased image noise, and even permanent damage; while too low temperature may cause LCD display freezing, battery performance to drop sharply, circuit board embrittlement and other problems. These problems will not only lead to a significant decrease in image quality, but may also lead to complete failure of the camera equipment.

[0003] In practical applications, 3D digital photogrammetry technology often needs to be operated outdoors or in industrial environments, where the ambient temperature is often difficult to control. For example, in high-altitude areas or polar expeditions, the ambient temperature may drop below -100°C; in industrial inspections such as high-temperature metallurgy, the ambient temperature may rise to above 100°C. These extreme environments pose a severe test to the normal operation of the camera. If the camera cannot be effectively protected from temperature, the accuracy and reliability of the measurement work will be seriously affected. Therefore, in order to ensure that 3D digital photogrammetry equipment can work stably and reliably in various extreme environments, effective protection measures must be provided for the camera. This includes not only cooling the camera in high-temperature environments, but also providing heating protection in low-temperature environments to ensure that the camera operates within its optimal operating temperature range. This two-way temperature protection measure is crucial to ensuring the long-term stability and image quality of camera equipment, and is also a prerequisite for the widespread application of 3D digital photogrammetry technology in extreme environments. Summary of the invention

[0004] In order to effectively solve the technical problem of protecting the camera in extreme high and low temperature environments, this patent designs a measuring equipment protection device that can effectively protect the camera from being affected or damaged by the hot and cold environment of the external high and low temperature box. The specific solution is as follows:

[0005] A measuring equipment protection device, the measuring equipment protection device comprising:

[0006] External insulation layer;

[0007] The inner shell is a double-layer cylindrical metal can arranged in the outer insulation layer, and the double-layer cylindrical metal can is provided with inner and outer double-layer tank walls to form an inner cavity and an outer cavity isolated from each other inside the inner shell.

[0008] A camera mounting frame and a camera fixedly mounted on the camera mounting frame are provided inside the inner cavity, at least one temperature sensor is provided in the inner cavity, an optical window is provided at the front end of the inner shell, the camera is mounted on the inner side of the optical window, an air inlet and an air outlet are provided in the inner cavity, and the air inlet and the air outlet are connected to an external air compressor through a ventilation pipeline;

[0009] The outer cavity is used as a cooling liquid flow cavity, and a liquid inlet and a liquid outlet are respectively provided on both sides of the outer wall of the inner shell, and the liquid inlet and the liquid outlet are respectively sealed and connected with a water cooling pipeline, and the water cooling pipeline is connected to an external cooling liquid circulation system;

[0010] A PLC controller is connected to the temperature sensor, the air compressor and the coolant circulation system. The controller adjusts the flow rates of the air compressor and the coolant circulation system according to the temperature change detected by the temperature sensor to keep the temperature of the inner cavity within the range of 20°C±5°C.

[0011] Furthermore, the outer insulation layer is made of polyurethane foam material.

[0012] Furthermore, the front end of the outer insulation layer is provided with an opening for exposing the optical window, and the optical window comprises a window flange seat, a window flange gland, and optical glass;

[0013] The window flange seat is arranged at the front end of the inner shell, the window flange seat is provided with an opening connected to the inner cavity, the window flange gland is fixedly connected to the window flange seat by a plurality of fastening bolts, and the optical glass seal is installed between the window flange gland and the window flange seat;

[0014] A sealing ring is arranged between the window flange seat and the window flange pressure cover, and sealing rings are arranged between the optical glass and the window flange seat and the window flange pressure cover.

[0015] Furthermore, a rear end cover is installed at the rear end of the inner housing through bolts for sealing and fixing, a sealing ring is provided between the rear end cover and the inner housing, and the camera mounting bracket is installed on the rear end cover.

[0016] The camera mounting frame is provided with an "L"-shaped metal frame, one side of the "L"-shaped metal frame is fixedly connected to the inner side of the rear end cover, and the camera is fixedly mounted on the other side of the "L"-shaped metal frame, and the camera is provided with a metal shell.

[0017] Furthermore, an optical lens module is installed between the camera and the optical glass.

[0018] Furthermore, the optical glass is quartz glass of DN100 specification, 20 mm thick, the parallelism of the two surfaces of the glass is ≤10°, the flatness of the glass is not less than wavelength / 10, and the total light transmittance of the anti-reflection film added on both sides of the glass is ≥95%.

[0019] Furthermore, the material of the inner shell is S30408 ​​stainless steel.

[0020] Furthermore, the rear end cover is penetrated by two through-wall sealing connectors, and the inner and outer sides of the through-wall sealing connectors are respectively connected to the camera and the remote monitor through signal power lines.

[0021] Furthermore, the ventilation pipeline and the water cooling pipeline are both double-layer hoses consisting of an inner metal hose and an outer rubber insulation hose.

[0022] The air inlet, the air exhaust, the liquid inlet and the liquid outlet are respectively provided with connecting joints exposed outside the outer insulation layer. One end of the double-layer hose is connected to the connecting joint through a first flexible joint, and the other end is connected to the air compressor or the coolant circulation system through a valve and a second flexible joint in turn.

[0023] A three-dimensional digital photogrammetry device is provided with the above-mentioned measuring device protection device.

[0024] Cooling water enters the outer cavity through the liquid inlet and is discharged from the liquid outlet to achieve circulation and take away the heat inside the tank. The ventilation pipeline is connected to the external air compressor through the air inlet and exhaust holes on the tank flange cover, and dry air is transported from the compressor to the tank to adjust the humidity and temperature inside the tank. The "L"-shaped plate in the camera mounting bracket is fixed to one end of the tank by welding or bolts, and the optical window is installed on one side of the tank through a sealed connection to ensure the camera's field of view in a closed environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0026] Figure 1 A cross-sectional view of a protective device for measuring equipment according to the present invention;

[0027] Figure 2 A cross-sectional view of the measuring equipment protection device of the present invention from another perspective;

[0028] Figure 3 A side view of the measuring equipment protection device of the present invention;

[0029] Figure 4 A three-dimensional cross-sectional view of a protective device for measuring equipment of the present invention;

[0030] Figure 5 It is a partial cross-sectional view of the equipment protection device;

[0031] Figure 6 for Figure 5 A partial enlarged view of

[0032] Figure 7 A structural diagram of a rear end cover and a camera assembly of a measuring device protection device of the present invention;

[0033] Figure 8 This is a structural diagram of the rear end cover with a through-wall sealing connector installed;

[0034] Fig. 9 The diagram is a structural diagram of a ventilation pipeline or a water cooling pipeline with a double-layer hose structure. DETAILED DESCRIPTION

[0035] In the following description, a large number of specific details are provided to provide a more thorough understanding of the present invention. However, it is apparent to those skilled in the art that the present invention can be implemented without one or more of these details. In other examples, in order to avoid confusion with the present invention, some technical features well known in the art are not described.

[0036] In order to fully understand the present invention, detailed steps and detailed structures will be proposed in the following description to illustrate the technical solution of the present invention. The preferred embodiments of the present invention are described in detail below, but in addition to these detailed descriptions, the present invention may also have other implementations.

[0037] The present invention provides a measuring equipment protection device, which includes an inner shell 100, an outer insulation layer 200, and a PLC controller. The outer insulation layer 200 is coated on the outer surface of the inner shell 100, and the outer insulation layer 200 is made of polyurethane foam, has good thermal insulation performance, isolates the cold and hot environment in the external high and low temperature box, and protects the camera from being affected or damaged by the cold and hot environment of the external high and low temperature box. The inner shell 100 is made of S30408 ​​stainless steel and has sufficient mechanical strength to support the entire device.

[0038] The inner shell 100 is a double-layer cylindrical metal can disposed in the outer insulation layer 200. The double-layer cylindrical metal can is provided with inner and outer double-layer can walls to form an inner cavity 110 and an outer cavity 120 that are isolated from each other inside the inner shell 100. A camera mounting frame 141 and a camera 140 fixedly mounted on the camera mounting frame 141 are provided inside the inner cavity 110. At least one temperature sensor is provided inside the inner cavity 110. An optical window 130 is provided at the front end of the inner shell 100. The camera 140 is mounted on the inner side of the optical window 130. The inner cavity 110 is provided with an air inlet 111 and an air outlet 112. The air inlet 111 and the air outlet 112 are connected to an external air compressor through a ventilation pipe 113.

[0039] The outer cavity 120 serves as a cooling liquid flow cavity. A liquid inlet 121 and a liquid outlet 122 are respectively provided on both sides of the outer wall of the inner shell 100. The liquid inlet 121 and the liquid outlet 122 are respectively sealed and connected with a water cooling pipeline 123, and the water cooling pipeline 123 is connected to an external cooling liquid circulation system.

[0040] The PLC controller is connected to the temperature sensor, air compressor, and coolant circulation system. The temperature change detected by the temperature sensor of the controller adjusts the flow rate of the air compressor and the coolant circulation system to keep the temperature of the inner cavity 110 within the range of 20℃±5℃.

[0041] The present invention combines the dual regulation of coolant and dry air, monitors and adjusts the temperature in the tank in real time through the PLC control system, ensures that the camera working temperature is basically consistent with the room temperature, and the temperature control is more efficient and reliable. The device shows significant advantages in applicable environment, structural design, material selection, protection performance, integration and temperature control, and can provide efficient protection under a wider range of extreme temperature conditions, ensuring the normal operation of the camera in extreme environments, greatly improving the application ability of three-dimensional digital photography equipment in extreme environments.

[0042] In an optional embodiment, the front end of the outer insulation layer 200 is provided with an opening for exposing the optical window 130, and the optical window 130 includes a window flange seat 131, a window flange gland 132, and an optical glass 133. The window flange seat 131 is provided at the front end of the inner shell 100, and the window flange seat 131 is provided with an opening connected to the inner cavity 110. The window flange gland 132 is fixedly connected to the window flange seat 131 by a plurality of fastening bolts, and the optical glass 133 is sealed and installed between the window flange gland 132 and the window flange seat 131. A sealing ring is provided between the window flange seat 131 and the window flange gland 132, and a sealing ring is provided between the optical glass 133 and the window flange seat 131 and the window flange gland 132.

[0043] In an optional embodiment, the optical glass 133 of the present invention is quartz glass of DN100 specification, 20 mm thick, parallelism of two glass surfaces ≤10°, flatness of the glass is not less than wavelength / 10, anti-reflection film is added on both sides of the glass, and total light transmittance is ≥95%.

[0044] In the structural design of the optical window 130, a detachable protective cover may be added. The protective cover may cover the optical glass 133 when the measuring device is not working to prevent dust, dirt, etc. from contaminating or damaging the surface of the optical glass. The design of the protective cover should ensure that it is easy and quick to install and remove, and does not affect the sealing performance of the optical window.

[0045] Through the above improvements, the optical window 130 of the present invention can not only provide stable temperature control and good optical performance, but also enhance the protection capability, ensuring that the three-dimensional digital photogrammetry equipment can work stably and reliably in various environments.

[0046] In an optional embodiment, an optical lens module 160 may be installed between the camera 140 and the optical glass 133 .

[0047] In an optional embodiment, a rear end cover 150 is fixedly installed at the rear end of the inner shell 100 by bolt sealing, a sealing ring is provided between the rear end cover 150 and the inner shell 100, and a camera mounting frame 141 is installed on the rear end cover 150. The camera mounting frame 141 is provided with an "L"-shaped metal frame, one side of the "L"-shaped metal frame is fixedly connected to the inner side surface of the rear end cover 150, and the camera 140 is fixedly installed on the other side of the "L"-shaped metal frame. The camera 140 is provided with a metal shell, and the metal shell has a better heat exchange effect to ensure that the internal camera components are consistent with the ambient temperature of the inner cavity 110, so that the camera 140 is in good working condition.

[0048] In an optional embodiment, the rear end cover 150 is penetrated by two through-wall sealing connectors 151, which are fixedly mounted on the rear end cover 150 by screws 153, and the inner and outer sides of the through-wall sealing connector 151 are respectively connected to the camera 140 and the remote monitor by signal power lines 152.

[0049] In an optional embodiment, the ventilation pipe 113 and the water cooling pipe 123 are both double-layer hoses composed of an inner metal hose 114 and an outer rubber insulation pipe 115. The air inlet 111, the exhaust hole 112, the liquid inlet 121, and the liquid outlet 122 are respectively provided with connection joints 116 exposed outside the outer insulation layer 200, one end of the double-layer hose is connected to the connection joint 116 through a first flexible joint, and the other end is connected to the air compressor or the coolant circulation system through a valve 117 and a second flexible joint in sequence.

[0050] The patented camera protection device achieves precise control of the internal temperature of the tank through a double-layer structure and a dynamic temperature control system. Its specific working principle is as follows:

[0051] The cooling liquid flows from the coolant circulation system into the outer cavity 120 of the tank, removes heat through circulation, and maintains the low temperature of the inner layer of the tank. The air compressor delivers dry air to the inner cavity 110 through the ventilation pipe 113, further adjusting the internal temperature of the tank to ensure that the working environment temperature of the camera is suitable. The PLC control system monitors the internal temperature of the tank in real time through the internal temperature sensor, and automatically adjusts the flow of cooling water and dry air according to the temperature changes to keep the internal temperature of the tank within the range of 20°C ± 5°C, so that the camera is always in an ideal working environment, improving its life and detection accuracy.

[0052] Action relationship description:

[0053] The coolant is mainly used to remove the heat inside the tank, while the dry air is used to further adjust the temperature inside the tank. Both are dynamically adjusted by the PLC control system to achieve precise temperature control. The camera is fixed in the tank through the internal camera mounting bracket, ensuring its stability and measurement accuracy in high and low temperature environments. The camera is connected to external devices through the wall-penetrating sealed connector to ensure the reliability and stability of signal transmission in high and low temperature environments.

[0054] The PLC control system dynamically adjusts in the following way: by collecting temperature data in real time, the PLC control system can automatically calculate the required flow of coolant and dry air. When the temperature inside the tank is detected to be rising, the system will increase the circulation of coolant and the delivery of dry air to quickly reduce the temperature. On the contrary, if the temperature drops to the lower limit of the set range, the system will reduce the supply of coolant and dry air to prevent overcooling. In addition, the PLC control system also has a fault self-diagnosis function. Once a system abnormality is detected, such as insufficient coolant flow or abnormal dry air pressure, the system will automatically sound an alarm and take corresponding protective measures to ensure the safe operation of the equipment.

[0055] In summary, the present invention sets the camera in the inner cavity of the double-layer tank, and the inner and outer cavities are respectively introduced with circulating dry compressed air and coolant. Through the dynamic temperature control system of PLC, the temperature inside the tank is precisely controlled, ensuring that the working environment temperature of the camera is suitable, providing efficient protection for the three-dimensional digital photogrammetry equipment under extreme temperature conditions, and ensuring the normal operation of the equipment in harsh environments. The present invention not only has significant advantages in structural design and material selection, but also performs well in protection performance, integration and temperature control. These advantages have greatly improved the application ability of the device in extreme environments, and provide a strong guarantee for the stable and reliable operation of the three-dimensional digital photogrammetry equipment in various environments.

[0056] The above describes the preferred embodiments of the present invention. It should be understood that the present invention is not limited to the above-mentioned specific embodiments, and the devices and structures that are not described in detail should be understood to be implemented in a common manner in the art; any technician familiar with the art can use the above-disclosed methods and technical contents to make many possible changes and modifications to the technical solutions of the present invention without departing from the scope of the technical solutions of the present invention, or modify them into equivalent embodiments of equivalent changes, which does not affect the essential content of the present invention. Therefore, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solutions of the present invention are still within the scope of protection of the technical solutions of the present invention.

Claims

1. A measuring equipment protection device, characterized in that: The measuring equipment protection device comprises: External insulation layer; The inner shell is a double-layer cylindrical metal can arranged in the outer insulation layer, and the double-layer cylindrical metal can is provided with inner and outer double-layer tank walls to form an inner cavity and an outer cavity isolated from each other inside the inner shell. A camera mounting frame and a camera fixedly mounted on the camera mounting frame are provided inside the inner cavity, at least one temperature sensor is provided in the inner cavity, an optical window is provided at the front end of the inner shell, the camera is mounted on the inner side of the optical window, an air inlet and an air outlet are provided in the inner cavity, and the air inlet and the air outlet are connected to an external air compressor through a ventilation pipeline; The outer cavity is used as a cooling liquid flow cavity, and a liquid inlet and a liquid outlet are respectively provided on both sides of the outer wall of the inner shell, and the liquid inlet and the liquid outlet are respectively sealed and connected with a water cooling pipeline, and the water cooling pipeline is connected to an external cooling liquid circulation system; A PLC controller is connected to the temperature sensor, the air compressor and the coolant circulation system. The PLC controller adjusts the flow rates of the air compressor and the coolant circulation system according to the temperature change detected by the temperature sensor to keep the temperature of the inner cavity within the range of 20°C±5°C.

2. The measuring equipment protection device according to claim 1, characterized in that: The outer thermal insulation layer is made of polyurethane foam material.

3. The measuring equipment protection device according to claim 1, characterized in that: The front end of the outer insulation layer is provided with an opening for exposing the optical window, and the optical window comprises a window flange seat, a window flange gland, and optical glass; The window flange seat is arranged at the front end of the inner shell, the window flange seat is provided with an opening connected to the inner cavity, the window flange gland is fixedly connected to the window flange seat by a plurality of fastening bolts, and the optical glass seal is installed between the window flange gland and the window flange seat; A sealing ring is arranged between the window flange seat and the window flange pressure cover, and sealing rings are arranged between the optical glass and the window flange seat and the window flange pressure cover.

4. The measuring equipment protection device according to claim 3, characterized in that: The rear end of the inner housing is sealed and fixed with a rear end cover by bolts, a sealing ring is provided between the rear end cover and the inner housing, and the camera mounting frame is installed on the rear end cover. The camera mounting frame is provided with an "L"-shaped metal frame, one side of the "L"-shaped metal frame is fixedly connected to the inner side of the rear end cover, and the other side of the "L"-shaped metal frame is fixedly mounted with the camera, and the camera is provided with a metal shell.

5. The measuring equipment protection device according to claim 4, characterized in that: An optical lens module is installed between the camera and the optical glass.

6. The measuring equipment protection device according to claim 3, characterized in that: The optical glass is quartz glass of DN100 specification and 20mm thickness. The parallelism of the two surfaces of the glass is ≤10°, the flatness of the glass is not less than wavelength / 10, and the total light transmittance of the anti-reflection film added on both sides of the glass is ≥95%.

7. The measuring equipment protection device according to claim 1, characterized in that: The material of the inner shell is S30408 ​​stainless steel.

8. The measuring equipment protection device according to claim 4, characterized in that: The rear end cover is penetrated by two through-wall sealing connectors, and the inner and outer sides of the through-wall sealing connectors are respectively connected to the camera and the remote monitor through signal power lines.

9. The measuring equipment protection device according to claim 1, characterized in that: The ventilation pipeline and the water cooling pipeline are both double-layer hoses consisting of an inner metal hose and an outer rubber insulation hose. The air inlet, the air exhaust, the liquid inlet and the liquid outlet are respectively provided with connecting joints exposed outside the outer insulation layer. One end of the double-layer hose is connected to the connecting joint through a first flexible joint, and the other end is connected to the air compressor or the coolant circulation system through a valve and a second flexible joint in turn.

10. A three-dimensional digital photogrammetry device, characterized in that: The three-dimensional digital photogrammetry equipment is provided with a measuring equipment protection device as described in any one of claims 1-9.

Images