Measurement equipment protection device and three-dimensional digital photogrammetry equipment

Abstract

The utility model 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 utility model relates to three-dimensional data acquisition, in particular to a measuring equipment protection device used in an environment of -100 DEG C to 130 DEG C and a three-dimensional digital photogrammetry device. Background Art

[0002] 3D digital photogrammetry technology has been widely applied in numerous fields, including topographic mapping, industrial inspection, and cultural heritage conservation. Its core approach relies on leveraging the high-precision capabilities of cameras to capture and process image data to generate accurate 3D models. However, this high-precision capture places extremely high demands on the camera's operating environment, particularly in extreme temperatures (such as extreme cold or heat), where proper operation can be severely challenged. Cameras are typically designed to operate within a temperature range of 10°C to 40°C. Outside this range, internal components such as sensors, optical lenses, and electronic circuitry can be subject to thermal stress, resulting in performance degradation. Excessively high temperatures can cause sensor overheating, accelerated aging of electronic components, increased image noise, and even permanent damage. Excessively low temperatures can cause LCD displays to freeze, battery performance to plummet, and circuit boards to become brittle. These issues not only significantly degrade image quality but can also lead to complete camera failure.

[0003] In practical applications, 3D digital photogrammetry technology often requires operation in outdoor or industrial environments, where temperatures are often difficult to control. For example, at high altitudes or during polar expeditions, ambient temperatures can drop below -100°C; while in industrial inspections, such as those involving high-temperature metallurgy, ambient temperatures can rise above 100°C. These extreme environments place severe demands on the proper operation of cameras. Failure to effectively protect the cameras from temperature fluctuations can severely impact measurement accuracy and reliability. Therefore, to ensure stable and reliable operation of 3D digital photogrammetry equipment in these extreme environments, effective camera protection is essential. This includes both cooling the camera in high-temperature environments and heating it up in low-temperature environments, ensuring that the camera operates within its optimal operating temperature range. This dual-mode temperature protection is crucial for ensuring long-term stability and image quality, and is a prerequisite for the widespread application of 3D digital photogrammetry technology in these extreme environments. Utility Model Content

[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 the influence or damage of the external high and low temperature box's hot and cold environment. The specific solution is as follows:

[0005] A measuring equipment protection device, comprising:

[0006] External insulation layer;

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

[0008] A camera mounting bracket and a camera fixedly mounted on the camera mounting bracket 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, and 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. The air inlet and the air outlet are connected to an external air compressor via a ventilation pipe.

[0009] The outer cavity serves 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. The liquid inlet and the liquid outlet are respectively sealed and connected to 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 rate of the air compressor and the coolant circulation system according to the temperature change detected by the temperature sensor to maintain 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 includes a window flange seat, a window flange gland, and optical glass;

[0013] The window flange seat is provided 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 provided between the window flange seat and the window flange pressure cover, and a sealing ring is provided between the optical glass and the window flange seat and the window flange pressure cover.

[0015] Furthermore, a rear end cover is fixedly installed at the rear end of the inner housing by bolts, 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 bracket 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, which 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, with a thickness of 20 mm, 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 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 pipe and the water cooling pipe are both double-layer hoses consisting of an inner metal hose and an outer rubber insulation hose.

[0022] The air inlet, the exhaust hole, 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 photogrammetric measurement device is provided with the above-mentioned measurement device protection device.

[0024] Cooling water enters the external cavity through the liquid inlet and exits through the liquid outlet, creating a circulation system that removes heat from the tank. A ventilation line connects to an external air compressor through the air inlet and exhaust holes in the tank flange. Dry air is delivered from the compressor into the tank to regulate humidity and temperature. The L-shaped plate in the camera mount is welded or bolted to one end of the tank, while the optical window is mounted on the side of the tank via a sealed connection, ensuring 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 any creative labor.

[0026] Figure 1 This is a cross-sectional view of a protective device for measuring equipment according to the present utility model;

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

[0028] Figure 3 It is a side view of the protective device of the measuring equipment of the utility model;

[0029] Figure 4 This is a three-dimensional cross-sectional view of the protective device for measuring equipment of the utility model;

[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 This is a structural diagram of the rear end cover and camera assembly of the measuring equipment protection device of the utility model;

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

[0034] Figure 9 This is a structural diagram of a ventilation pipe or water cooling pipe with a double-layer hose structure. DETAILED DESCRIPTION

[0035] In the following description, numerous specific details are provided to provide a more thorough understanding of the present invention. However, it will be apparent to those skilled in the art that the present invention can be practiced without one or more of these details. In other instances, certain technical features known in the art are not described to avoid confusion with the present invention.

[0036] In order to fully understand the present invention, detailed steps and detailed structures will be provided 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. However, in addition to these detailed descriptions, the present invention may also have other implementation methods.

[0037] This utility model provides a protective device for measuring equipment, comprising an inner housing 100, an outer insulation layer 200, and a PLC controller. The outer insulation layer 200, formed from polyurethane foam and covering the outer surface of the inner housing 100, offers excellent thermal insulation properties, insulating the device from the external high and low temperature chamber environment and protecting the camera from the effects or damage of this environment. The inner housing 100 is made of S30408 ​​stainless steel, providing sufficient mechanical strength to support the entire device.

[0038] The inner shell 100 is a double-layer cylindrical metal can disposed within the outer insulation layer 200. The double-layer cylindrical metal can has inner and outer double-layer tank walls to form an inner cavity 110 and an outer cavity 120 within the inner shell 100, which are isolated from each other. A camera mounting bracket 141 and a camera 140 fixedly mounted on the camera mounting bracket 141 are located within the inner cavity 110. At least one temperature sensor is disposed within the inner cavity 110. An optical window 130 is provided at the front end of the inner shell 100, and 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, which are connected to an external air compressor via a ventilation line 113.

[0039] The outer cavity 120 serves as a cooling liquid flow cavity, and 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 to a water cooling pipe 123, and the water cooling pipe 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 controller temperature sensor 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] This new device combines dual regulation of coolant and dry air, and uses a PLC control system to monitor and adjust the tank's internal temperature in real time, ensuring that the camera's operating temperature is essentially consistent with the room temperature, making temperature control more efficient and reliable. This device demonstrates significant advantages in terms of applicable environment, structural design, material selection, protection performance, integration, and temperature control. It can provide effective protection under a wider range of extreme temperature conditions, ensuring the normal operation of the camera in extreme environments, and greatly enhancing the application capabilities of 3D 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. 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 located at the front end of the inner housing 100 and has an opening connected to the inner cavity 110. The window flange gland 132 is fixedly connected to the window flange seat 131 using multiple fastening bolts. The optical glass 133 is sealed 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 both 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 DN100 quartz glass with a thickness of 20 mm. The parallelism of the two surfaces of the glass is ≤10°, the flatness of the glass is not less than wavelength / 10, and anti-reflection film is added on both sides of the glass, and the total transmittance is ≥95%.

[0044] The optical window 130 may also be designed with a removable protective cover. This cover can be placed over the optical glass 133 when the measuring device is not in use to prevent dust, dirt, and other contaminants from contaminating or damaging the optical glass surface. The design of the protective cover should ensure quick and easy installation and removal without compromising 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 other side of the "L"-shaped metal frame is fixedly installed with the camera 140. 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, two wall-penetrating sealing connectors 151 are provided through the rear end cover 150, and the wall-penetrating sealing connectors 151 are fixedly mounted on the rear end cover 150 by screws 153. The inner and outer sides of the wall-penetrating sealing connector 151 are respectively connected to the camera 140 and the remote monitor via signal power lines 152.

[0049] In an optional embodiment, both the ventilation line 113 and the water-cooling line 123 are double-layered hoses consisting of an inner metal hose 114 and an outer rubber insulation hose 115. The air inlet 111, exhaust 112, and liquid inlet 121 and liquid outlet 122 are each provided with a connector 116 exposed outside the outer insulation layer 200. One end of the double-layered hose is connected to the connector 116 via a first flexible joint, and the other end is connected to the air compressor or coolant circulation system via a valve 117 and a second flexible joint.

[0050] This 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] Cooling liquid flows from the coolant circulation system into the outer cavity 120 of the tank, removing heat through circulation and maintaining a low temperature inside the inner layer of the tank. The air compressor delivers dry air to the inner cavity 110 through the ventilation line 113, further regulating the internal temperature of the tank to ensure the camera's operating environment is at an appropriate temperature. The PLC control system monitors the internal temperature of the tank in real time through an internal temperature sensor, automatically adjusting the flow of cooling water and dry air based on temperature changes to maintain the internal temperature of the tank within the range of 20°C ± 5°C, ensuring that the camera is always in an ideal working environment, improving its lifespan and detection accuracy.

[0052] Action relationship description:

[0053] Coolant primarily removes heat from the tank, while dry air further regulates the tank's temperature. Both are dynamically adjusted through the PLC control system for precise temperature control. The camera is secured within the tank via an internal camera mount, ensuring stability and measurement accuracy in both high and low temperature environments. Through-wall sealed connectors connect the camera to external devices, ensuring reliable and stable signal transmission in both high and low temperature environments.

[0054] The PLC control system dynamically adjusts itself by collecting real-time temperature data and automatically calculating the required coolant and drying air flow rates. If the system detects a rise in the internal tank temperature, it increases the coolant circulation and drying air delivery to quickly reduce the temperature. Conversely, if the temperature drops to the lower limit of the set range, the system reduces the coolant and drying air supply to prevent overcooling. Furthermore, the PLC control system features self-diagnosis. If it detects a system anomaly, such as insufficient coolant flow or abnormal drying air pressure, it automatically issues an alarm and takes appropriate protective measures to ensure safe operation of the equipment.

[0055] In summary, the present invention places the camera within the inner cavity of a double-layer tank, with circulating dry compressed air and coolant flowing into the inner and outer cavities, respectively. Through a PLC-based dynamic temperature control system, precise control of the tank's internal temperature is achieved, ensuring a suitable operating temperature for the camera. This provides efficient protection for the 3D digital photogrammetry equipment under extreme temperature conditions, ensuring the equipment's ability to function properly in harsh environments. This invention not only boasts significant advantages in structural design and material selection, but also excels in protection, integration, and temperature control. These advantages significantly enhance the device's applicability in extreme environments, providing a strong guarantee for the stable and reliable operation of 3D digital photogrammetry equipment in a variety of settings.

[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-mentioned 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 solution of the present invention, or modify them into equivalent embodiments with 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 that do not depart from the content of the technical solution of the present invention are still within the scope of protection of the technical solution 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 tank arranged in the outer insulation layer. The double-layer cylindrical metal tank is provided with inner and outer double-layer tank walls to form an inner cavity and an outer cavity that are isolated from each other inside the inner shell. A camera mounting bracket and a camera fixedly mounted on the camera mounting bracket 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, and 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. The air inlet and the air outlet are connected to an external air compressor via a ventilation pipe. The outer cavity serves 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. The liquid inlet and the liquid outlet are respectively sealed and connected to 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 rate of the air compressor and the coolant circulation system according to the temperature change detected by the temperature sensor to maintain 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 includes a window flange seat, a window flange cover, and optical glass; The window flange seat is provided 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 provided between the window flange seat and the window flange pressure cover, and a sealing ring is provided 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 fixedly and sealed with a rear end cover by bolts. A sealing ring is provided between the rear end cover and the inner housing. The camera mounting bracket is mounted 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 antireflection 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 pipe and the water cooling pipe are both double-layer hoses consisting of an inner metal hose and an outer rubber insulation hose. The air inlet, the exhaust hole, 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 according to any one of claims 1 to 9.

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