Counting device and method for glass insulator production

Through the cooperation of infrared light and electric push rod, the problem of inaccurate counting during the conveying of glass insulators is solved, and higher counting accuracy and stability are achieved.

CN120493974APending Publication Date: 2025-08-15JIANGXI QUANXIN ELECTRIC CO LTD
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Patent Information

Application Number
CN202510562656.0
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-04-30
Publication Date
2025-08-15

AI Technical Summary

Technical Problem

In the prior art, the camera counting is not accurate enough during the conveying process of glass insulators, which is affected by the camera's outer wall environment and transportation speed, resulting in low counting accuracy.

Method used

The infrared ray lamp and electric push rod are used to detect the glass insulators through the infrared ray lamp and control the electric push rod to push the plate to achieve accurate counting. The camera counts batches of glass insulators, reducing the requirements for the camera and enhancing the counting accuracy.

Benefits of technology

Improves the accuracy of glass insulator counting, reduces the impact of dust on the camera, and ensures the stability and accuracy of counting.

✦ Generated by Eureka AI based on patent content.

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Abstract

The invention discloses a counting device and method for glass insulator production, and belongs to the technical field of glass insulator counting, the counting device comprises two sets of fixing plates, conveying mechanisms are arranged on the opposite sides of the two sets of fixing plates, and the glass insulators can be conveyed through the conveying mechanisms; when the glass insulators are conveyed to make contact with the contact switch, the electric push rod drives the push block to convey the glass insulators to the other conveying mechanism, the baffles of the electric push rod play a role in blocking and limiting the glass insulators, and the infrared ray lamps can play a role in detecting the corresponding glass insulators. When the infrared ray lamps all detect the infrared ray lamps, the electric push rod can drive the push plate to push the infrared ray lamps to discharge materials, the camera plays a role in counting batch glass insulators, batch counting has low requirements on the camera, counting is more accurate, counting cannot be affected by part of dust adhering to an outer cover of the camera, and the counting efficiency is improved. Therefore, the counting accuracy of the glass insulator is enhanced.
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Description

Technical Field

[0001] The present invention relates to the field of glass insulator counting, in particular to a counting device and method for producing glass insulators. Background Art

[0002] Insulators are generally divided into glass insulators, porcelain insulators and composite insulators, and are generally heavier. The higher the voltage level of the insulator, the larger its size and volume tend to be in order to meet the requirements of electrical performance and mechanical strength. The counting device for glass insulator production is a device that counts the glass insulators after processing.

[0003] Currently, glass insulators need to be counted by cameras during transportation. However, camera counting is often affected by the environment of the camera's outer wall or the transportation speed of the glass insulators, resulting in inaccurate counting, thereby reducing the accuracy of glass insulator counting. Summary of the Invention

[0004] In response to the shortcomings of the existing technology, the present invention provides a counting device for glass insulator production, which overcomes the shortcomings of the existing technology and solves the problem that glass insulators need to be counted by a camera during transportation. However, camera counting is often affected by the environment of the camera's outer wall or the transportation speed of the glass insulators, resulting in inaccurate counting, thereby reducing the accuracy of glass insulator counting.

[0005] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a counting device for glass insulator production, comprising two groups of fixed plates, a conveying mechanism being provided on one side of the two groups of fixed plates which are arranged opposite to each other, the two groups of fixed plates being arranged in an L-shape, baffles being fixedly installed on the upper ends of the tail ends of the two groups of fixed plates, a support plate being fixedly installed on one side of one of the fixed plates in each group, electric push rods being fixedly installed on the upper ends of the two groups of support plates, a pushing block being fixedly installed on the telescopic end of one of the electric push rods, and a pushing plate being fixedly installed on the telescopic end of the other electric push rod, a contact switch being installed on the inner side of the baffle, a lifting plate being slidably connected on the opposite side of the two baffles, a plurality of groups of infrared lamps being installed on the inner wall of the lifting plate, the plurality of groups of infrared lamps and contact switches being electrically connected to the corresponding electric push rods, and two cameras being provided on one side of the lifting plate.

[0006] By adopting the above technical solution, when in use, the conveying mechanism can convey the glass insulators, and when the glass insulators are conveyed and contact the contact switch, the electric push rod drives the push block to convey the glass insulators to another conveying mechanism, and its baffle plays a role of blocking and limiting the glass insulators, and the infrared ray lamp can play a role of detecting the corresponding glass insulators. When the infrared ray lamps all detect the infrared ray lamps, the electric push rod can drive the push plate to push the infrared ray lamps to unload the materials, and the camera plays a role of counting the batches of glass insulators. The batch counting has lower requirements for the camera, and the counting is more accurate. Dust sticking to the camera cover will not affect the counting, thereby enhancing the counting accuracy of the glass insulators.

[0007] As a preferred technical solution of the present invention, the upper ends of the two baffles are respectively fixedly installed with L-shaped plates, the lower ends of the two groups of L-shaped plates are respectively fixedly installed with hydraulic rods, the telescopic ends of the two groups of hydraulic rods are fixedly installed with the lifting plates, and the positions of the lifting plates correspond to the positions of the pushing plates.

[0008] By adopting the above technical solution, the baffle can fix the L-shaped plate, the L-shaped plate can fix the hydraulic rod, and the hydraulic rod can lift the lifting plate.

[0009] As a preferred technical solution of the present invention, a blanking plate is installed on the outer wall of the fixed plate located on one side of the lifting plate, and the blanking plate is arranged in an L-shape.

[0010] By adopting the above technical solution, the L-shaped blanking plate can be fixed by the fixing plate, and the blanking plate facilitates the sliding and blanking of the glass insulator.

[0011] As a preferred technical solution of the present invention, side panels are fixedly installed on both sides of the blanking plate, the two side panels are fixedly installed with corresponding fixed plates, and the opposite sides of the two side panels are fixedly installed with two cameras respectively.

[0012] By adopting the above technical solution, the side panels can be fixed by the fixing plate and the blanking plate, and the side panels can fix the camera.

[0013] As a preferred technical solution of the present invention, the conveying mechanism includes two groups of conveying rollers, which are respectively rotatably mounted on the inner walls of a corresponding group of fixed plates. The outer walls of each group of conveying rollers are respectively driven by belts, and the outer walls of the two groups of fixed plates are respectively installed with stepping motors, and the output shafts of the stepping motors are fixedly connected to the rotating shafts of the conveying rollers.

[0014] By adopting the above technical solution, the fixing plate can fix the stepping motor, and the stepping motor can drive the conveying roller to rotate, and the conveying roller and the belt cooperate to conveniently convey the glass insulator.

[0015] As a preferred technical solution of the present invention, the same auxiliary plate is installed on the inner wall of the intersection of the two groups of fixed plates, and the auxiliary plate is at the same height as the conveyor belt. A guide plate is fixedly installed on the upper end of the fixed plate located on one side of the contact switch, and the guide plate is arranged in a Y shape. The lower ends of the two groups of fixed plates are respectively fixedly installed with brackets.

[0016] By adopting the above technical solution, the auxiliary plate can be fixed by the fixing plate, and the setting of the auxiliary plate can facilitate the transportation of the glass insulator from one conveyor belt to another, while the guide plate can guide the glass insulator, and the bracket can support the fixing plate.

[0017] As a preferred technical solution of the present invention, a controller is installed on the outer wall of one of the fixed plates, and the controller is electrically connected to the infrared lamp, contact switch, electric push rod, hydraulic rod, camera and stepper motor.

[0018] By adopting the above technical solution, the setting of the controller can facilitate the staff to operate the infrared lamp, contact switch, electric push rod, hydraulic rod, camera and stepper motor, and the controller-end display can display the working status of the infrared lamp, contact switch, electric push rod, hydraulic rod, camera and stepper motor.

[0019] A counting method for glass insulator production, comprising the following steps: Step 1: The controller initializes all connected electronic devices, such as infrared ray lamps, contact switches, electric push rods, hydraulic rods, cameras and stepper motors, so that the staff can operate the infrared ray lamps, contact switches, electric push rods, hydraulic rods, cameras and stepper motors. The controller-side display can also display the working status of the infrared ray lamps, contact switches, electric push rods, hydraulic rods, cameras and stepper motors. Step 2: The two stepper motors are started separately to drive the conveying roller to rotate, and the belt begins to transport the glass insulator. The guide plate can guide the glass insulator. Then the glass insulator contacts the contact switch, so that the electric push rod drives the push plate to push the glass insulator to another belt. The auxiliary plate maintains the stability of the conveying. Then the infrared ray lamp senses the corresponding glass insulator. The infrared ray lamp can be set to a fixed number of groups for easy counting. When the infrared ray lamp senses the glass insulator, this group of insulators can be conveyed. Step 3: When the infrared ray lamps all sense the glass insulators, the hydraulic rod drives the lifting plate to move vertically, which makes it convenient for the electric push rod to drive the pushing plate to push and transport the glass insulators. The unloading plate and side plate facilitate unloading of the glass insulators and are convenient for the staff to collect the materials, or other collecting mechanisms to collect the materials; Step 4: The camera is set up to count batches of glass insulators. Batch counting has lower requirements for the camera and the counting is more accurate. Dust on the camera cover will not affect the counting, thereby enhancing the counting accuracy of glass insulators.

[0020] Compared with the prior art, the present invention has the following beneficial effects: (1) The present invention can convey glass insulators through the conveying mechanism. When the glass insulator contacts the contact switch, the electric push rod drives the push block to convey the glass insulator to another conveying mechanism, and its baffle plays a role of blocking and limiting the glass insulator. The infrared ray lamp can detect the corresponding glass insulator. When the infrared ray lamp detects the infrared ray lamp, the electric push rod can drive the push plate to push the infrared ray lamp to unload the material, and the camera plays a role of counting the batches of glass insulators. The batch counting has lower requirements for the camera, and the counting is more accurate. The dust on the camera cover will not affect the counting, thereby enhancing the counting accuracy of the glass insulators.

[0021] (2) The present invention can play the role of side blocking and limiting the glass insulator through the lifting plate, and the lifting plate is convenient for vertical movement under the cooperation of the hydraulic rod, which is convenient for unloading the glass insulator.

[0022] (3) The present invention installs the infrared ray lamp in the inner wall of the lifting plate, which can prevent the glass insulator from causing damage to the infrared ray lamp when inspecting the glass insulator. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a front view schematic diagram of the present invention; Figure 2 It is a rear view schematic diagram of the present invention; Figure 3 For the present invention Figure 2 Enlarged view of point A in the middle; Figure 4 It is a right side cross-sectional view of the conveyor belt in the present invention; Figure 5 For the present invention Figure 4 Enlarged view of point B in the middle; Figure 6 It is an enlarged view of the guide plate in the present invention.

[0024] Description of reference numerals: 1. Fixed plate; 2. Conveyor roller; 3. Conveyor belt; 4. Baffle; 5. Contact switch; 6. Electric push rod; 7. Push block; 8. Push plate; 9. Infrared ray lamp; 10. Support plate; 11. Stepper motor; 12. Controller; 13. Guide plate; 14. Blanking plate; 15. Side plate; 16. Camera; 17. Auxiliary plate; 18. L-shaped plate; 19. Hydraulic rod; 20. Lifting plate; 21. Bracket. DETAILED DESCRIPTION

[0025] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0026] See also Figure 1 、 Figure 2 and Figure 6 , a counting device for glass insulator production, comprising two groups of fixed plates 1, a conveying mechanism is provided on one side of the two groups of fixed plates 1 arranged opposite to each other, the two groups of fixed plates 1 are arranged and installed in an L-shape, the upper ends of the tail ends of the two groups of fixed plates 1 are respectively fixedly installed with baffles 4, one side of one of the fixed plates 1 in each group is respectively fixedly installed with a support plate 10, the upper ends of the two groups of support plates 10 are respectively fixedly installed with electric push rods 6, the telescopic end of one electric push rod 6 is fixedly installed with a pushing block 7, the telescopic end of the other electric push rod 6 is fixedly installed with a pushing plate 8, a contact switch 5 is installed on the inner side of the baffle 4, and a lifting plate 20 is slidably connected to the opposite side of the two baffles 4, and a plurality of groups of infrared ray lamps 9 are installed in the inner wall of the lifting plate 20, and the plurality of groups of infrared ray lamps 9 and the contact switches 5 are respectively electrically connected to the corresponding electric push rods 6. Connection, two cameras 16 are set on one side of the lifting plate 20, which can convey the glass insulators through the conveying mechanism. When the glass insulator is conveyed and contacts the contact switch 5, the electric push rod 6 drives the push block 7 to convey the glass insulator to another conveying mechanism, and its baffle 4 plays a blocking and limiting role on the glass insulator, and the infrared ray lamp 9 can detect the corresponding glass insulator. When the infrared ray lamp 9 detects the infrared ray lamp 9, the electric push rod 6 can drive the push plate 8 to push the infrared ray lamp 9 to unload, and the camera 16 counts the batches of glass insulators. The batch counting has lower requirements for the camera 16, and the counting is more accurate. The dust on the outer cover of the camera 16 will not affect the counting, thereby enhancing the counting accuracy of the glass insulators.

[0027] For details, see Figure 1 、 Figure 2 、 Figure 4 and Figure 5The conveying mechanism includes two groups of conveying rollers 2, and the two groups of conveying rollers 2 are respectively rotatably installed with the inner wall of the corresponding group of fixed plates 1. The outer wall of each group of conveying rollers 2 is respectively driven by a belt. The outer walls of the two groups of fixed plates 1 are respectively installed with a stepping motor 11. The output shaft of the stepping motor 11 is fixedly connected to the rotating shaft of the conveying roller 2. The fixed plate 1 can play a fixing role for the stepping motor 11, and the stepping motor 11 can drive the conveying roller 2 to rotate. The conveying roller 2 cooperates with the belt to facilitate the conveying of the glass insulator. The inner wall of the intersection of the two groups of fixed plates 1 is installed with a The same auxiliary plate 17 has the same height as the conveyor belt 3. The upper end of the fixed plate 1 located on the side of the contact switch 5 is fixedly installed with a guide plate 13. The guide plate 13 is set in a Y shape. The lower ends of the two groups of fixed plates 1 are respectively fixedly installed with brackets 21. The auxiliary plate 17 can be fixed by the fixed plate 1. The setting of the auxiliary plate 17 can facilitate the transportation of glass insulators from one conveyor belt 3 to another conveyor belt 3. The guide plate 13 can guide the glass insulator, and the bracket 21 can support the fixed plate 1.

[0028] For details, see Figure 1-Figure 3 The upper ends of the two baffles 4 are respectively fixed with L-shaped plates 18, and the lower ends of the two groups of L-shaped plates 18 are respectively fixed with hydraulic rods 19. The telescopic ends of the two groups of hydraulic rods 19 are fixed with the lifting plate 20. The position of the lifting plate 20 corresponds to the position of the push plate 8. The baffle 4 can fix the L-shaped plate 18, and the L-shaped plate 18 can fix the hydraulic rod 19, and the hydraulic rod 19 can lift the lifting plate 20. The outer wall of the fixed plate 1 on one side of the lifting plate 20 is installed with a blanking plate 14 The blanking plate 14 is L-shaped, and the fixing plate 1 can fix the L-shaped blanking plate 14, and the blanking plate 14 facilitates the sliding and blanking of the glass insulator. Side panels 15 are fixedly installed on both sides of the blanking plate 14, and the two side panels 15 are fixedly installed with the corresponding fixing plates 1. The opposite sides of the two side panels 15 are fixedly installed with two cameras 16 respectively. The side panels 15 can be fixed by the fixing plate 1 and the blanking plate 14, and the side panels 15 can fix the cameras 16.

[0029] For details, see Figure 1 and Figure 2A controller 12 is installed on the outer wall of one of the fixed plates 1. The controller 12 is electrically connected to the infrared lamp 9, the contact switch 5, the electric push rod 6, the hydraulic rod 19, the camera 16 and the stepper motor 11. The setting of the controller 12 can facilitate the staff to operate the infrared lamp 9, the contact switch 5, the electric push rod 6, the hydraulic rod 19, the camera 16 and the stepper motor 11, and the display at the end of the controller 12 can display the working status of the infrared lamp 9, the contact switch 5, the electric push rod 6, the hydraulic rod 19, the camera 16 and the stepper motor 11.

[0030] Working principle: When in use, the controller 12 initializes all connected electronic devices, such as the infrared ray lamp 9, the contact switch 5, the electric push rod 6, the hydraulic rod 19, the camera 16 and the stepper motor 11, so that the staff can operate the infrared ray lamp 9, the contact switch 5, the electric push rod 6, the hydraulic rod 19, the camera 16 and the stepper motor 11, and the display at the end of the controller 12 can display the working status of the infrared ray lamp 9, the contact switch 5, the electric push rod 6, the hydraulic rod 19, the camera 16 and the stepper motor 11; two stepper motors 1 1 are started separately, driving the conveying roller 2 to rotate, and the belt begins to transport the glass insulator. The guide plate 13 can guide and transport the glass insulator. Then the glass insulator contacts the contact switch 5, so that the electric push rod 6 drives the push plate 8 to push the glass insulator to another belt. The auxiliary plate 17 maintains the stability of the transportation. Then the infrared ray lamp 9 senses the corresponding glass insulator. The infrared ray lamp 9 can be set to a fixed number of groups for easy counting. When the infrared ray lamp 9 senses the glass insulator, the group of insulators can be transported. When the infrared ray lamps 9 all sense the glass insulators, the hydraulic rod 19 drives the lifting plate 20 to move vertically, which makes it convenient for the electric push rod 6 to drive the pushing plate 8 to push and transport the glass insulators, and the unloading plate 14 and the side plate 15 facilitate the unloading of the glass insulators, and are convenient for the staff to collect the materials, or other collecting mechanisms to collect the materials; the setting of the camera 16 plays the role of counting batches of glass insulators, and the batch counting has lower requirements for the camera 16, and the counting is more accurate. Dust on the outer cover of the camera 16 will not affect the counting, thereby enhancing the counting accuracy of the glass insulators.

[0031] Finally, it should be noted that in the description of the present invention, it should be noted that the terms "vertical", "up", "down", "horizontal", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limiting the present invention.

[0032] In the description of the present invention, it should also be noted that, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to mechanical connections or electrical connections; they may refer to direct connections or indirect connections through an intermediate medium; and they may refer to internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0033] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art will be able to modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein with equivalents. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A counting device for glass insulator production, comprising two sets of fixed plates (1), characterized in that: A conveying mechanism is provided on one side of the two groups of fixed plates (1) that are arranged opposite to each other. The two groups of fixed plates (1) are arranged and installed in an L-shape. A baffle (4) is fixedly installed on the upper end of the tail end of the two groups of fixed plates (1). A support plate (10) is fixedly installed on one side of one of the fixed plates (1) in each group. An electric push rod (6) is fixedly installed on the upper end of the two groups of support plates (10). A push block (7) is fixedly installed on the telescopic end of one of the electric push rods (6), and a push plate (8) is fixedly installed on the telescopic end of the other electric push rod (6). A contact switch (5) is installed on the inner side of the baffle (4). A lifting plate (20) is slidably connected to the side of the two baffles (4) that are arranged opposite to each other. Multiple groups of infrared ray lamps (9) are installed on the inner wall of the lifting plate (20). The multiple groups of infrared ray lamps (9) and the contact switches (5) are electrically connected to the corresponding electric push rods (6). Two cameras (16) are provided on one side of the lifting plate (20).

2. A counting device for glass insulator production according to claim 1, characterized in that: An L-shaped plate (18) is fixedly mounted on the upper ends of the two baffles (4), and a hydraulic rod (19) is fixedly mounted on the lower ends of the two groups of L-shaped plates (18). The telescopic ends of the two groups of hydraulic rods (19) are fixedly mounted on the lifting plate (20), and the position of the lifting plate (20) corresponds to the position of the pushing plate (8).

3. The counting device for glass insulator production according to claim 1, characterized in that: A blanking plate (14) is installed on the outer wall of the fixed plate (1) located on one side of the lifting plate (20), and the blanking plate (14) is arranged in an L-shape.

4. A counting device for glass insulator production according to claim 3, characterized in that: Side panels (15) are fixedly mounted on both sides of the blanking plate (14), the two side panels (15) are fixedly mounted on the corresponding fixed plates (1), and the two cameras (16) are fixedly mounted on the opposite sides of the two side panels (15).

5. The counting device for glass insulator production according to claim 1, characterized in that: The conveying mechanism comprises two groups of conveying rollers (2), the two groups of conveying rollers (2) are rotatably mounted on the inner wall of a corresponding group of fixed plates (1), the outer wall of each group of conveying rollers (2) is respectively driven by a belt, and the outer walls of the two groups of fixed plates (1) are respectively mounted with a stepping motor (11), and the output shaft of the stepping motor (11) is fixedly connected to the rotating shaft of the conveying roller (2).

6. A counting device for glass insulator production according to claim 5, characterized in that: The same auxiliary plate (17) is installed on the inner wall of the intersection of the two groups of fixed plates (1), and the auxiliary plate (17) is at the same height as the conveyor belt (3). A guide plate (13) is fixedly installed on the upper end of the fixed plate (1) on the side of the contact switch (5), and the guide plate (13) is arranged in a Y shape. Brackets (21) are fixedly installed on the lower ends of the two groups of fixed plates (1).

7. A counting device for glass insulator production according to claim 6, characterized in that: A controller (12) is installed on the outer wall of one of the fixed plates (1), and the controller (12) is electrically connected to the infrared ray lamp (9), the contact switch (5), the electric push rod (6), the hydraulic rod (19), the camera (16) and the stepping motor (11).

8. A counting method for glass insulator production, using the counting device for glass insulator production according to claim 7, characterized in that: The steps include: Step 1: The controller (12) initializes all connected electronic devices, such as the infrared ray lamp (9), the contact switch (5), the electric push rod (6), the hydraulic rod (19), the camera (16) and the stepping motor (11), so that the staff can operate the infrared ray lamp (9), the contact switch (5), the electric push rod (6), the hydraulic rod (19), the camera (16) and the stepping motor (11), and the display at the end of the controller (12) can display the working status of the infrared ray lamp (9), the contact switch (5), the electric push rod (6), the hydraulic rod (19), the camera (16) and the stepping motor (11); Step 2: The two stepper motors (11) are started separately to drive the conveying roller (2) to rotate, and the belt starts to transport the glass insulators. The guide plate (13) can guide and transport the glass insulators. Then the glass insulators contact the contact switch (5), so that the electric push rod (6) drives the push plate (8) to push the glass insulators to another belt. The auxiliary plate (17) maintains the stability of the transportation. Then the infrared ray lamp (9) senses the corresponding glass insulators. The infrared ray lamp (9) can be set to a fixed number of groups for easy counting. When the infrared ray lamp (9) senses the glass insulators, the group of insulators can be transported. Step 3: When the infrared ray lamp (9) senses the glass insulator, the hydraulic rod (19) drives the lifting plate (20) to move vertically, which facilitates the electric push rod (6) to drive the push plate (8) to push and transport the glass insulator, and the unloading plate (14) and the side plate (15) facilitate unloading of the glass insulator and facilitate the staff to collect the material, or other material collection mechanisms to collect the material; Step 4: The camera (16) is set to count batches of glass insulators. Batch counting has lower requirements for the camera (16), and the counting is more accurate. Dust on the outer cover of the camera (16) will not affect the counting, thereby enhancing the counting accuracy of the glass insulators.