An automatic focusing device for industrial cameras

Abstract

The invention discloses an automatic focusing device for industrial cameras, comprising a frame, a first synchronous wheel is provided on one side of the frame, a second synchronous wheel is provided on the other side, the first synchronous wheel is connected to a servo motor, a synchronous belt is provided on the first and second synchronous wheels, a friction belt with a circle of protrusions is provided along the belt teeth of the synchronous belt, a circle of grooves corresponding to the friction belt is provided on the first and second synchronous wheels, an adjustable upper clamping wheel is provided on the upper side of the synchronous belt, an adjustable lower clamping wheel is provided on the lower side, and a fixing piece is also provided on the frame. The device can be easily installed for industrial cameras with different caliber focusing lenses and realize automatic and precise focusing, avoiding the modification of the camera lens and improving the degree of automation of the use of ordinary industrial cameras.

Description

Technical Field

[0001] The invention relates to a device, in particular to a device capable of automatically adjusting the focal length of an industrial camera under control. Background Art

[0002] Industrial cameras are a key component in machine vision systems. Their function is to convert optical signals into orderly electrical signals. Compared with traditional civilian cameras, industrial cameras have high image stability, high transmission capacity, and high anti-interference ability. Industrial cameras have a wide range of applications. They obtain image information of the object to be detected through industrial cameras, and then obtain detection results through image analysis. For example, they are used in product appearance detection, infrared laser imaging detection and other fields. When industrial cameras face different shooting objects, they often need to adjust the focal length. However, since ordinary industrial cameras do not have their own focusing mechanism, they can only be adjusted manually, which brings many inconveniences to use. Invention patent application CN104635313A discloses a focusing lens and an industrial camera equipped with the lens, and utility model patent CN208721933U discloses an automatic focusing structure. Both technical solutions require changes to the structure of the focusing lens, so the solution is not suitable for solving how to perform automatic focusing without changing the structure of the focusing lens of an ordinary industrial camera; utility model patent CN207502874U discloses an automatic focusing industrial camera, which requires the use of a sleeve on the end of the lens, and then rotates and focuses under the drive of a motor through a belt drive. The solution requires customization of a sleeve that is compatible with the industrial camera lens, and the installation is cumbersome and inconvenient to use.

[0003] In view of this, how to accurately and automatically focus ordinary industrial cameras without changing the focus lens structure, and how to simply install and adapt focus lenses of different apertures are technical problems that are expected to be solved in this field. Summary of the invention

[0004] The purpose of the present invention is to provide an automatic focusing device for an industrial camera, which can be easily installed and realize automatic and precise focusing for industrial cameras with focusing lenses of different calibers, avoids the modification of the camera lens, and improves the degree of automation in the use of ordinary industrial cameras.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] The first and second synchronous wheels are provided with a synchronous belt, and the synchronous belt is provided with a raised friction belt along the belt teeth; the first and second synchronous wheels are provided with a circle of grooves corresponding to the friction belt; an adjustable upper pressure wheel is provided on the upper side of the synchronous belt; an adjustable lower pressure wheel is provided on the lower side of the synchronous belt; a fixing part is also provided on the frame; when the industrial camera is fixed on the fixing part, the focusing extension of the industrial camera lens is located on the inner side of the synchronous belt; the adjustable upper pressure wheel can adjust and press the synchronous belt so that the friction belt on the synchronous belt contacts the upper side of the focusing extension; the adjustable lower pressure wheel can adjust and press the synchronous belt so that the friction belt on the synchronous belt contacts the lower side of the focusing extension.

[0007] Preferably, a fixed ear plate is installed on one side of the frame, a driving shaft is installed on the fixed ear plate, the first synchronous wheel is installed on the driving shaft, the driving shaft is connected to the servo motor, an adjustable ear plate is installed on the other side opposite to the frame, a driven shaft is installed on the adjustable ear plate, the second synchronous wheel is installed on the driven shaft, and the adjustable ear plate can adjust the distance from the fixed ear plate.

[0008] Preferably, the adjustable ear plate is fixed on a support plate, and the support plate is fixed to the frame by bolts. Guide rods parallel to each other are also provided on the frame. A through hole is left on the support plate and the guide rod is sleeved on the through hole. A spring is sleeved on the part of the bolt or guide rod between the support plate and the frame.

[0009] Preferably, the adjustable upper pressure wheel is mounted on the upper ear plate, the upper ear plate is fixed on the upper support plate, the upper support plate is fixed to the frame via upper bolts, an upper guide rod is also mounted on the upper support plate, the upper guide rod passes through a first preset through hole on the frame, and an upper spring is sleeved on the part of the upper guide rod or the upper bolt located between the frame and the upper support plate; the adjustable lower pressure wheel is mounted on the lower ear plate, the lower ear plate is fixed on the lower support plate, the lower support plate is fixed to the frame via bolts, a lower guide rod is also mounted on the lower support plate, the lower guide rod passes through a second preset through hole on the frame, and a lower spring is sleeved on the part of the lower guide rod or the lower bolt located between the frame and the lower support plate.

[0010] Preferably, a synchronous belt upper pull rod and a lower pull rod are further provided, and the upper pull rod and the lower pull rod are used to pull the synchronous belt and form a gap between the synchronous belts that is larger than a gap when the synchronous belt is freely released.

[0011] This focusing device drives the focus lens of the industrial camera to rotate through the friction belt in the synchronous belt to achieve focusing. The upper and lower adjustable clamping wheels can be adjusted according to the camera lens aperture and press the synchronous belt, so that the friction belt contacts the focusing extension of the lens, ensuring the synchronization of the movement of the synchronous belt and the rotation of the focusing extension. The movement of the adjustable ear plate can loosen or tighten the synchronous belt to provide a synchronous belt accommodation margin for lenses of different sizes, so that the lens can be smoothly inserted into the middle of the synchronous belt, which ensures that it can be used with industrial cameras of any size, and there is no need to change the structure of the focusing lens itself. The upper pull rod and the lower pull rod play the role of lifting the synchronous belt, leaving a wider gap for the synchronous belt to facilitate lens insertion.

[0012] When using it, you only need to insert the lens into the synchronous belt, fix the camera on the fixing part, and then use the upper and lower clamping wheels to tighten the synchronous belt. The installation operation is very convenient. The servo motor moves after receiving the external control signal, and realizes the precise rotation control of the focusing lens through the synchronous belt. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the structure of the present invention;

[0014] Figure 2 It is a front view of the present invention;

[0015] Figure 3 Another structural schematic diagram of the present invention;

[0016] Figure 4 This is a schematic diagram of the structure of the synchronous belt. DETAILED DESCRIPTION

[0017] The present invention is further described below by specific embodiments:

[0018] Figure 1 , Figure 2 , Figure 3 and Figure 4As shown, the automatic focusing device for an industrial camera includes a frame 1, two front-to-back symmetrical fixed ear plates 2 are installed on the inner side of the right side wall of the frame 1, a connecting plate is integrally arranged between the two fixed ear plates and fixed to the frame 1 by bolts, corresponding shaft holes are left on the two fixed ear plates 2, a driving shaft 3 passes through the two shaft holes and is installed between the two fixed ear plates 2 by bearings, a first synchronous wheel is fixed on the driving shaft 3, the driving shaft 3 is also connected to the output shaft of the servo motor 5, the servo motor 5 is fixed to the frame 1 by a motor bracket 51, and the first synchronous wheel can rotate with the driving shaft 3 under the drive of the servo motor 5; two front-to-back symmetrical adjustable ear plates 6 are installed on the corresponding left side, and the adjustable ear plates 6 The distance between the fixed ear plate 2 can be adjusted, and a corresponding axial hole is left between the two adjustable ear plates 6. The driven shaft 7 passes through the two axial holes and is installed between the two adjustable ear plates 6 through bearings. A second synchronous wheel 8 is installed on the driven shaft 7, and a synchronous belt 9 is installed on the first synchronous wheel and the second synchronous wheel 8. A circle of belt teeth 91 is evenly arranged on the inner wall of the synchronous belt 9, and a circle of raised friction belt 92 is left in the middle of the belt teeth. When the focusing extension 111 of the lens of the industrial camera 110 is focused, the focusing extension 111 is located between the synchronous belts 9, and there is friction between the friction belt 92 arranged on the synchronous belt 9 and the focusing extension 111, and the synchronous belt can drive the focusing extension to rotate in both positive and negative directions. The first synchronous wheel and the second synchronous wheel 8 are both provided with gear teeth 81 corresponding to the synchronous belt teeth 91, and a circle of grooves 82 corresponding to the raised friction belt is reserved in the middle part of the gear teeth 81. When the two synchronous wheels move together with the synchronous belt 9, the belt teeth mesh with the gear teeth and rotate together, and the raised friction belt 92 on the synchronous belt is just located in the groove 82 of the synchronous wheel, so that the friction between the friction belt 92 and the focusing extension 111 can be ensured, and the conveyor belt 9 can be ensured to rotate along with the first and second synchronous wheels.

[0019] Further, when the two adjustable ear plates 6 are adjustably connected to the frame 1, the following scheme can be implemented: a support plate 10 is integrally arranged and connected between the two adjustable ear plates 6, a screw 12 is fixedly installed on the support plate 10, the screw 12 has an external thread 121 and is arranged toward the outside of the frame 1, a through hole capable of accommodating the screw 12 passing through is reserved on the frame 1, a nut 13 is sleeved on the part of the screw 12 located outside the frame 1, and a spring 14 is sleeved on the screw located between the inner side of the frame and the support plate 10, and the spring 14 is in a compressed state when the device is in normal use. When the present device is used to perform a focusing operation on the focusing extension 111, the nut 13 is first rotated toward the inside of the frame 1 and the position of the adjustable ear plate 6 is adjusted so that the two sides of the synchronous belt 9 can accommodate the passing of the focusing extension 111 after opening, and then the nut 13 is rotated toward the outside of the frame 1 and the positional relationship between the adjustable ear plate 6 and the synchronous belt 9 is adjusted until the synchronous belt 9 can drive the focusing extension 111 to rotate together to achieve the focusing operation.

[0020] Furthermore, two parallel guide rods 15 are fixed on the frame 1 and located on both sides of the screw rod 12, and corresponding through holes are left on the support plate 10. The guide rods 15 can pass through the through holes and move up and down along the through holes, guiding the movement of the adjustable ear plate, so that it can move along a straight square when driving the second synchronous wheel to move, thereby increasing the convenience and accuracy of adjustment.

[0021] To enhance the focusing effect, an adjustable upper pinch wheel 16 is installed above the synchronous belt 9, and an adjustable lower pinch wheel 17 (i.e. Figure 1 In the up and down directions), the upper and lower clamping wheels can adjust the position relationship with the synchronous belt. When the focusing extension 111 is placed between the synchronous belts 9 for focusing operation, the upper and lower clamping wheels adjust their positions to press on the synchronous belts 9, which can increase the friction between the synchronous belts 9 and the focusing extension 111, ensuring that the focusing extension 111 can move with the synchronous belts 9 so as to perform precise focusing operations.

[0022] When the adjustable upper clamping wheel 16 is fixed on the frame 1, the preferred solution is:

[0023] Two symmetrical upper ear plates 18 are installed on the inner side of the upper side wall of the frame 1, and an upper support plate 19 is integrally arranged between the two upper ear plates 18. An upper screw 20 is fixed on the upper support plate 19 and arranged toward the upper side. A through hole capable of accommodating the upper screw 20 is provided on the frame 1, an upper nut 21 is sleeved on the portion of the upper screw 20 located on the outer side of the frame 1, and an upper spring 22 is sleeved on the portion of the upper screw 20 located between the inner side of the frame 1 and the upper support plate 19. When the device is in normal use, the upper spring 22 is in a compressed state. An upper guide rod 23 for guiding is also installed on the upper support plate, and a first preset through hole capable of accommodating the guide rod 23 is provided on the frame 1.

[0024] When the adjustable lower clamping wheel 17 is fixed on the frame 1, the specific structure is the same as the way the adjustable upper clamping wheel is fixed on the frame. Two symmetrical lower ear plates are installed on the inner side of the lower side wall of the frame 1, and a lower support plate is integrally arranged between the two lower ear plates. A lower screw is fixed on the lower support plate and the lower screw is arranged toward the upper side. A through hole capable of accommodating the lower screw passing through is provided on the frame 1, a lower nut is sleeved on the lower screw portion located on the outer side of the frame 1, and a lower spring is sleeved on the lower screw portion located between the inner side of the frame 1 and the lower support plate. When the device is in normal use, the lower spring is in a compressed state. A lower guide rod for guiding is also installed on the lower support plate, and a second preset through hole capable of accommodating the lower guide rod passing through is provided on the frame 1.

[0025] In order to facilitate the installation of the industrial camera 110 on the frame 1 for focusing operation, a fixing part 24 is fixedly installed on the frame 1, and the fixing part 24 has a mounting platform 241. When in use, the industrial camera 110 is installed on the platform of the fixing part 24, and at this time, the focusing extension 111 of the lens is inserted into the synchronous belt 9, and then the adjustable ear plate is adjusted to make the synchronous belt contact with the focusing extension, and then the upper and lower pressure wheels are adjusted to press on the synchronous belt.

[0026] An upper pull rod 25 can also be installed on the upper side of the synchronous belt 9, and a lower pull rod 26 can be installed on the lower side. The upper pull rod and the lower pull rod are used to prop open the synchronous belt 9 so that a gap larger than that when the upper and lower pull rods are not freely released is formed between the synchronous belts 9, so as to facilitate the insertion of the industrial camera lens. After the industrial camera is inserted, the synchronous belt is propped up so that the upper and lower pull rods no longer contact the synchronous belt.

[0027] The servo motor 5 can also be connected to the control device, and can rotate under the control of the control device to adjust the focal length value of the lens. For example, this technology is disclosed in the invention patent application with application publication number CN104635313A and application name Focusing extension and industrial camera with the focusing extension. The motor can automatically adjust the focal length and adjust the lens to a clear image under the control of the control unit.

[0028] This embodiment is only an illustration of the concept and implementation of the present invention, and does not limit it. Under the concept of the present invention, technical solutions that have not been substantially changed are still within the scope of protection.

Claims

1. An automatic focusing device for an industrial camera, comprising a frame, characterized in that: A first synchronous wheel is provided on one side of the frame, and a second synchronous wheel is provided on the other side opposite thereto. The first synchronous wheel is connected to a servo motor. A synchronous belt is installed on the first synchronous wheel and the second synchronous wheel. The synchronous belt is provided with a raised friction belt along the belt teeth. The first synchronous wheel and the second synchronous wheel are provided with a circle of grooves corresponding to the friction belt. An adjustable upper clamping wheel is provided on the upper side of the synchronous belt. The adjustable upper clamping wheel is installed on an upper ear plate. The upper ear plate is fixed on an upper support plate. The upper support plate is fixed to the frame via upper bolts. A An adjustable lower clamping wheel, the adjustable lower clamping wheel is mounted on a lower ear plate, the lower ear plate is fixed on a lower support plate, and the lower support plate is fixed to the frame via lower bolts; a fixing piece is also mounted on the frame, when the industrial camera is fixed on the fixing piece, the focus extension of the industrial camera lens is located on the inner side of the synchronous belt, the adjustable upper clamping wheel can adjust and press the synchronous belt so that the friction belt on the synchronous belt contacts the upper side of the focus extension, and the adjustable lower clamping wheel can adjust and press the synchronous belt so that the friction belt on the synchronous belt contacts the lower side of the focus extension; An upper guide rod is also installed on the upper support plate, the upper guide rod passes through a first preset through hole on the frame, and an upper spring is sleeved on the portion of the upper guide rod or the upper bolt located between the frame and the upper support plate; a lower guide rod is also installed on the lower support plate, the lower guide rod passes through a second preset through hole on the frame, and a lower spring is sleeved on the portion of the lower guide rod or the lower bolt located between the frame and the lower support plate.

2. The automatic focusing device for an industrial camera according to claim 1, characterized in that: A fixed ear plate is installed on one side of the frame, a driving shaft is installed on the fixed ear plate, the first synchronous wheel is installed on the driving shaft, the driving shaft is connected to the servo motor, an adjustable ear plate is installed on the other side opposite to the frame, a driven shaft is installed on the adjustable ear plate, the second synchronous wheel is installed on the driven shaft, and the adjustable ear plate can adjust the distance from the fixed ear plate.

3. The automatic focusing device for an industrial camera according to claim 2, characterized in that: The adjustable ear plate is fixed on the support plate, and the support plate is fixed to the frame by bolts. The frame is also provided with guide rods parallel to each other. Through holes are left on the support plate and the guide rods are sleeved on the through holes. A spring is sleeved on the part of the bolts or guide rods between the support plate and the frame.

4. The automatic focusing device for an industrial camera according to claim 1, characterized in that: An upper pull rod and a lower pull rod of the synchronous belt are also provided, and the upper pull rod and the lower pull rod are used to pull the synchronous belt and form a gap between the synchronous belts that is larger than the gap when the synchronous belt is freely released.

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