Efficient preparation process of convex lens for automobile lens

Abstract

The invention relates to an efficient preparation process of a convex lens for an automobile lens. The efficient preparation process is characterized by specifically comprising the following steps of S1, incoming material detection, S2, cleaning and feeding, S3, heating and softening, S4, compression molding, S5, annealing, S6, slitter edge removal, S7, polishing and S8, detection and warehousing. Transfer work in the convex lens machining process is automatically completed through the pipeline feeding mechanism and the mechanical arm assembly, manual centralized transfer is not needed, and the machining efficiency is greatly improved.

Description

Technical Field

[0001] This invention relates to the field of convex lens manufacturing technology, and specifically to an efficient manufacturing process for convex lenses used in automotive lenses. Background Technology

[0002] Convex lenses for automobiles are an important component of automotive lights. They are often manufactured using a heat-pressing process. During processing, the glass body needs to be heated and softened before being placed on a rack inside a heating furnace. Existing heating furnace racks often use surface supports to store the glass body. Since the bottom of the glass body is in contact with the rack, uneven heating can occur. This can easily lead to substandard product quality due to localized low temperatures during pressing. Furthermore, each process of automotive convex lenses requires manual transfer, resulting in extremely low efficiency. Therefore, designing an efficient manufacturing process for automotive convex lenses is crucial to solving these problems. Summary of the Invention

[0003] To address the aforementioned problems, this invention presents an efficient manufacturing process for convex lenses used in automotive lenses. The process automatically completes the transfer of convex lenses during processing using a pipeline feeding mechanism and a robotic arm assembly, eliminating the need for manual centralized transfer and significantly improving processing efficiency.

[0004] To solve the above-mentioned technical problems, the present invention provides an efficient manufacturing process for convex lenses used in automobiles, characterized by the following steps: S1: Incoming material inspection: The incoming glass body is inspected by the workers with the naked eye, and damaged glass body is removed; S2: Cleaning and feeding: Workers clean the undamaged glass body to remove surface stains and fingerprints, and then send the cleaned glass body into the pipeline feeding mechanism; S3: Heating and softening: The glass body enters the annular heating furnace through the pipeline feeding mechanism for heating and softening; S4: Pressing and molding: The heated glass body is fed into the bidirectional pressing and molding machine through the first robotic arm assembly to press and form a convex lens preform. S5: Annealing: The convex lens blank is fed into the annealing device through the second robotic arm assembly to remove stress through annealing; S6: Remove excess material: First, use a contour scribing mechanism to scribble the excess material on the convex lens blank, then remove the excess material by tapping. S7: Grinding: Place the convex lens blank (after removing the waste edges in step S6) into a grinding machine. Grind the surface of the convex lens blank to form a convex lens. The convex lens blank undergoes rough grinding, fine grinding, polishing, and cleaning in the grinding machine in sequence. S8: Inspection and Warehousing: First, the convex lens is visually inspected to remove defective products that have occurred during the processing. Then, the dimensions of the convex lens are inspected using dimensional inspection equipment. Finally, the convex lens is optically inspected using optical instruments. Once the optical inspection is successful, it is stored in the warehouse.

[0005] Furthermore, one end of the pipeline feeding mechanism is provided with a sequential feeding mechanism, and the other end extends directly above the feeding station of the annular heating furnace. The first robotic arm assembly is installed at the bottom of the upper support plate. One end of the upper support plate is located on the left side of the bidirectional pressing molding machine, and the other end of the upper support plate extends directly above the discharging station of the annular heating furnace. The second robotic arm assembly is located on the right side of the bidirectional pressing molding machine, and the annealing device is located on the front side of the bidirectional pressing molding machine.

[0006] Furthermore, the sequential feeding mechanism includes a vertically arranged guide box, a semi-circular feeding rack, a telescopic cylinder, and a first feeding wheel. The upper end of the guide box is open, and guide strips are provided on its front and rear inner walls. The semi-circular feeding rack is connected to the telescopic cylinder located at the bottom of the guide box and is slidably connected to the guide box by the cylinder's drive. Two first feeding wheels are arranged one in front and one behind in the lower end of the guide box. The two first feeding wheels are rotated by the drive of a first chain sprocket mechanism. The bottom of the semi-circular feeding rack has a notch relative to the position of the first feeding wheels. The upper end of the first feeding wheel extends into the semi-circular feeding rack along the notch under the action of the telescopic cylinder.

[0007] Furthermore, the pipeline feeding mechanism includes an outer conveying pipeline, an annular guide frame, a second feeding wheel installed at the bottom of the annular guide frame, an automatic feeding clamp, and a feeding cylinder. The annular guide frame is horizontally fixed inside the outer conveying pipeline. Several second feeding wheels are arranged from left to right at the bottom of the annular guide frame. Each of two adjacent second feeding wheels is driven to rotate by a chain. One end of the outer conveying pipeline is connected to the guide box, and an electric heating tube is also provided on its inner wall. The semi-annular feeding frame is flush with the annular guide frame under the drive of the telescopic cylinder. The other end of the outer conveying pipeline extends directly above the feeding station of the annular heating furnace and is sealed. A feeding port is opened at the bottom of the outer conveying pipeline directly opposite the feeding station. The feeding cylinder is installed at the top of the outer conveying pipeline directly above the feeding port. The output shaft end of the feeding cylinder extends into the outer conveying pipeline and is connected to the automatic feeding clamp.

[0008] Furthermore, the automatic feeding fixture includes a mounting plate, limiting claws, and a contact block on the outer wall of the limiting claws. The output shaft end of the feeding cylinder is connected to the top of the horizontally mounted mounting plate. A limiting claw is provided on the front and rear sides of the left and right ends of the mounting plate. The two limiting claws on the same end are arranged opposite each other and there is a gap between their lower ends. The gap between the lower ends of the two limiting claws is smaller than the width of the glass body. The upper end of the limiting claw is rotatably connected to the mounting plate through a connector. A torsion spring structure is also provided between the connector and the mounting plate.

[0009] Furthermore, a rubber anti-collision block is provided on the inner wall of the sealed end of the external conveying pipe.

[0010] Furthermore, the annular heating furnace includes a circular worktable, a heating outer cover, an annular rotating platform, and glass placement rack assemblies. The top of the circular worktable has a mounting groove that matches the annular rotating platform, and the annular rotating platform is rotatably connected in the mounting groove. The heating outer cover is arc-shaped and matches the annular rotating platform. The heating outer cover is fixed on the circular worktable above the annular rotating platform. Several glass placement rack assemblies are arranged in a circle on the annular rotating platform, and the glass placement rack assemblies enter the heating outer cover in sequence as the annular rotating platform rotates.

[0011] Furthermore, the inner ring of the annular rotary table is provided with a toothed structure, and the top of the circular worktable is also provided with a groove that communicates with the mounting slot. A drive gear is rotatably connected in the groove, and the drive gear meshes with the toothed structure. The groove is sealed by a cover plate, and a servo motor that drives the drive gear to rotate is also installed on the top of the cover plate.

[0012] Furthermore, the glass body placement rack assembly consists of a base plate, C-shaped placement racks, spherical support blocks, and side limiting baffles. Two C-shaped placement racks are fixed to the base plate by support rods. Each of the two C-shaped placement racks is positioned upwards and on opposite sides, with a side limiting baffle. Spherical support blocks are provided on the inner walls of both sides of the C-shaped placement racks, and the C-shaped placement racks provide point support for the glass body through the spherical support blocks.

[0013] Furthermore, each of the base plates on both sides of the C-shaped placement rack is provided with an elastic touch rod assembly. The elastic touch rod assembly consists of a telescopic rod, a spring, and a fixed outer cylinder. The fixed outer cylinder is vertically installed on the base plate, and the lower end of the telescopic rod extends into the upper end of the fixed outer cylinder and is connected to it by the spring.

[0014] With the above structure, the present invention has the following beneficial effects: This invention automates the transfer of materials during the processing of convex lenses using a pipeline feeding mechanism and a robotic arm assembly, eliminating the need for manual centralized transfer and greatly improving processing efficiency.

[0015] The glass body placement rack assembly in this invention provides suspended support for the glass body through point support, which enables more uniform heating of all parts of the glass body and ensures product quality.

[0016] 3. The present invention also includes an electric heating tube in the pipeline feeding mechanism, which preheats the glass body and enhances its practical performance. Attached Figure Description

[0017] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0018] Figure 1 A partial layout diagram of a convex lens manufacturing production line.

[0019] Figure 2 This is a top view of the feeding mechanism.

[0020] Figure 3 This is a partial structural diagram of the pipeline feeding mechanism.

[0021] Figure 4 This is a top view of the annular heating furnace.

[0022] Figure 5 This is a structural diagram of the glass body placement rack assembly.

[0023] In the diagram: 1 is the sequential feeding mechanism; 1-1 is the guide box; 1-2 is the semi-circular feeding rack; 1-3 is the guide strip; 1-4 is the first feeding wheel; 2 is the pipeline feeding mechanism; 2-1 is the external conveying pipeline; 2-2 is the rubber anti-collision block; 2-3 is the annular guide frame; 2-4 is the second feeding wheel; 2-5 is the limiting gripper; 2-6 is the mounting plate; 2-7 is the feeding cylinder; 2-8 is the connecting part; 2-9 is the contact block; 3 is the annular heating furnace; 3-1 is the circular worktable; 3-2 is the heating element. 3-3 Outer cover, 3-4 Ring rotary table, 3-5 Cover plate, 3-6 Servo motor, 3-7 Tooth structure, 3-7 Glass body placement rack assembly, 3-7-1 Base plate, 3-7-2 C-shaped placement rack, 3-7-3 Spherical support block, 3-7-4 Support rod, 3-7-5 Side limiting baffle, 3-7-6 Fixed outer cylinder, 3-7-7 Telescopic rod, 4 Upper support plate, 5 Bidirectional pressing molding machine, 6 Second robotic arm assembly, 7 Annealing device. Detailed Implementation

[0024] The technical solution of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0025] In the description of this invention, it should be noted that certain terms indicating orientation or positional relationships are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting this invention.

[0026] In the description of this invention, it should be noted that the term "connection" should be interpreted broadly. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0027] The present invention will be further described in detail below through specific embodiments.

[0028] This invention provides an efficient manufacturing process for convex lenses used in automotive lenses, which specifically includes the following steps: S1: Incoming material inspection: The incoming glass body is inspected by the workers with the naked eye, and damaged glass body is removed; S2: Cleaning and feeding: Workers clean the undamaged glass body to remove surface stains and fingerprints, and then send the cleaned glass body into the pipeline feeding mechanism; S3: Heating and softening: The glass body enters the annular heating furnace through the pipeline feeding mechanism for heating and softening; S4: Pressing and molding: The heated glass body is fed into the bidirectional pressing and molding machine through the first robotic arm assembly to press and form a convex lens preform. S5: Annealing: The convex lens blank is fed into the annealing device through the second robotic arm assembly to remove stress through annealing; S6: Remove excess material: First, use a contour scribing mechanism to scribble the excess material on the convex lens blank, then remove the excess material by tapping. S7: Grinding: Place the convex lens blank (after removing the waste edges in step S6) into a grinding machine. Grind the surface of the convex lens blank to form a convex lens. The convex lens blank undergoes rough grinding, fine grinding, polishing, and cleaning in the grinding machine in sequence. S8: Inspection and Warehousing: First, the convex lens is visually inspected to remove defective products that have occurred during the processing. Then, the dimensions of the convex lens are inspected using dimensional inspection equipment. Finally, the convex lens is optically inspected using optical instruments. Once the optical inspection is successful, it is stored in the warehouse.

[0029] like Figure 1 The pipe feeding mechanism 2 shown has a sequential feeding mechanism 1 at one end, and its other end extends directly above the feeding station of the annular heating furnace 3. The first robotic arm assembly is installed at the bottom of the upper support plate 4, one end of which is located on the left side of the bidirectional pressing molding machine 5, and the other end extends directly above the discharging station of the annular heating furnace. The second robotic arm assembly 6 is located on the right side of the bidirectional pressing molding machine, and the annealing device 7 is located on the front side of the bidirectional pressing molding machine. This invention automatically completes the transfer work during the processing of convex lenses through the pipe feeding mechanism and the robotic arm assembly, eliminating the need for manual centralized transfer and greatly improving processing efficiency.

[0030] like Figure 2 The sequential feeding mechanism shown includes a vertically arranged guide box 1-1, a semi-circular feeding rack 1-2, a telescopic cylinder, and a first feeding wheel 1-4. The upper end of the guide box is open, and guide strips 1-3 are provided on its front and rear inner walls. The semi-circular feeding rack is connected to the telescopic cylinder located at the bottom of the guide box and is slidably connected to the guide box by the cylinder. Two first feeding wheels are arranged one in front and one behind in the lower end of the guide box. The two first feeding wheels are rotated by the drive of a first chain sprocket mechanism. The bottom of the semi-circular feeding rack has a notch relative to the position of the first feeding wheels. The upper end of the first feeding wheel extends into the semi-circular feeding rack along the notch under the action of the telescopic cylinder.

[0031] like Figure 3The pipeline feeding mechanism shown includes an outer conveying pipeline 2-1, an annular guide frame 2-3, a second feeding wheel 2-4 installed at the bottom of the annular guide frame, an automatic feeding clamp, and a feeding cylinder 2-7. The annular guide frame is horizontally fixed inside the outer conveying pipeline. Several second feeding wheels are arranged from left to right at the bottom of the annular guide frame. Each of two adjacent second feeding wheels is driven to rotate by a chain. One end of the outer conveying pipeline is connected to the guide box, and an electric heating tube is also provided on its inner wall. The semi-annular feeding frame is flush with the annular guide frame under the drive of the telescopic cylinder. The other end of the outer conveying pipeline extends directly above the feeding station of the annular heating furnace and is sealed. A feeding port is opened at the bottom of the outer conveying pipeline directly opposite the feeding station. The feeding cylinder is installed at the top of the outer conveying pipeline directly above the feeding port. The output shaft end of the feeding cylinder extends into the outer conveying pipeline and is connected to the automatic feeding clamp. The present invention also includes an electric heating tube in the pipeline feeding mechanism, which preheats the glass body and enhances its practical performance.

[0032] like Figure 3 The automatic feeding fixture shown includes a mounting plate 2-6, limiting grippers 2-5, and contact blocks 2-9 on the outer walls of the limiting grippers. The output shaft of the feeding cylinder is connected to the top of the horizontally mounted mounting plate. A limiting gripper is located on each of the front and rear sides of the left and right ends of the mounting plate. Two limiting grippers on the same end are positioned opposite each other with a gap between their lower ends. The gap between the lower ends of the two limiting grippers is less than the width of the glass body. The upper ends of the limiting grippers are rotatably connected to the mounting plate via connectors 2-8. A torsion spring structure is also provided between the connectors and the mounting plate. When feeding is required, the feeding cylinder is activated. During the descent, the contact blocks contact the elastic contact rod assembly on the glass body placement frame assembly, opening the limiting grippers to both sides. The glass body confined within the two limiting grippers automatically falls into the glass body placement frame assembly.

[0033] like Figure 3 A rubber anti-collision block 2-2 is provided on the inner wall of the sealed end of the conveying outer pipe shown. This design prevents unnecessary damage caused by hard collisions.

[0034] like Figure 4 The annular heating furnace shown includes a circular worktable 3-1, a heating outer cover 3-2, an annular rotating platform 3-3, and a glass placement rack assembly 3-7. The top of the circular worktable has a mounting groove that matches the annular rotating platform, and the annular rotating platform is rotatably connected in the mounting groove. The heating outer cover is arc-shaped and matches the annular rotating platform. The heating outer cover is fixed on the circular worktable above the annular rotating platform. Several glass placement rack assemblies are arranged in a circle on the annular rotating platform, and the glass placement rack assemblies enter the heating outer cover in sequence as the annular rotating platform rotates.

[0035] like Figure 4 The inner ring of the circular rotary table shown has a toothed structure 3-6. The top of the circular worktable also has a groove that communicates with the mounting slot. A drive gear is rotatably connected in the groove. The drive gear meshes with the toothed structure. The groove is sealed by a cover plate 3-4. A servo motor 3-5 that drives the drive gear to rotate is also installed on the top of the cover plate.

[0036] like Figure 5 The glass body placement rack assembly shown consists of a base plate 3-7-1, a C-shaped placement rack 3-7-2, a spherical support block 3-7-3, and a side limiting baffle 3-7-5. Two C-shaped placement racks are fixed to the base plate via support rods 3-7-4. Each of the two C-shaped placement racks, facing upwards and spaced apart, has a side limiting baffle on its opposite side. Spherical support blocks are installed on the inner walls of both sides of the C-shaped placement racks, providing point support for the glass body. This glass body placement rack assembly uses point support to suspend and support the glass body, which allows for more uniform heating of all parts of the glass body and ensures product quality.

[0037] like Figure 5 The C-shaped placement rack shown has an elastic touch rod assembly on each of its two base plates. The elastic touch rod assembly consists of a telescopic rod 3-7-7, a spring, and a fixed outer cylinder 3-7-6. The fixed outer cylinder is vertically mounted on the base plate, and the lower end of the telescopic rod extends into the upper end of the fixed outer cylinder and is connected to it by the spring.

[0038] The above are merely preferred embodiments of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions falling within the scope of the present invention's concept are within the scope of protection of the present invention. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principles of the present invention should be considered within the scope of protection of the present invention.

Claims

1. A high-efficiency manufacturing process for convex lenses used in automobiles, characterized in that: Specifically, the following steps are included: S1: Incoming material inspection: The incoming glass body is inspected by the workers with the naked eye, and damaged glass body is removed; S2: Cleaning and feeding: Workers clean the undamaged glass body to remove surface stains and fingerprints, and then send the cleaned glass body into the pipeline feeding mechanism; S3: Heating and softening: The glass body enters the annular heating furnace through the pipeline feeding mechanism for heating and softening; S4: Pressing and molding: The heated glass body is fed into the bidirectional pressing and molding machine through the first robotic arm assembly to press and form a convex lens preform. S5: Annealing: The convex lens blank is fed into the annealing device through the second robotic arm assembly to remove stress through annealing; S6: Remove excess material: First, use a contour scribing mechanism to scribble the excess material on the convex lens blank, then remove the excess material by tapping. S7: Grinding: Place the convex lens blank (after removing the waste edges in step S6) into a grinding machine. Grind the surface of the convex lens blank to form a convex lens. The convex lens blank undergoes rough grinding, fine grinding, polishing, and cleaning in the grinding machine in sequence. S8: Inspection and Warehousing: First, the convex lens is visually inspected to remove defective products that have occurred during the processing. Then, the dimensions of the convex lens are inspected using dimensional inspection equipment. Finally, the convex lens is optically inspected using optical instruments. Once the optical inspection is successful, it is stored in the warehouse.

2. The efficient manufacturing process for a convex lens for automotive applications according to claim 1, characterized in that: One end of the pipeline feeding mechanism (2) is provided with a feeding mechanism (1), and the other end of the mechanism extends directly above the feeding station of the annular heating furnace (3). The first robotic arm assembly is installed at the bottom of the upper support plate (4). One end of the upper support plate is located on the left side of the bidirectional pressing molding machine, and the other end of the upper support plate extends directly above the discharge station of the annular heating furnace. The second robotic arm assembly is located on the right side of the bidirectional pressing molding machine, and the annealing device is located on the front side of the bidirectional pressing molding machine.

3. The efficient manufacturing process for a convex lens for automotive applications according to claim 2, characterized in that: The sequential feeding mechanism includes a vertically arranged guide box (1-1), a semi-circular feeding rack (1-2), a telescopic cylinder, and a first feeding wheel (1-4). The upper end of the guide box is open, and guide strips (1-3) are provided on its front and rear inner walls. The semi-circular feeding rack is connected to the telescopic cylinder located at the bottom of the guide box and is slidably connected to the guide box by the cylinder. Two first feeding wheels are arranged one in front and one behind in the lower end of the guide box. The two first feeding wheels are rotated by the drive of the first chain sprocket mechanism. The bottom of the semi-circular feeding rack has a notch relative to the position of the first feeding wheel. The upper end of the first feeding wheel extends into the semi-circular feeding rack along the notch under the action of the telescopic cylinder.

4. The efficient manufacturing process for a convex lens for automotive applications according to claim 3, characterized in that: The pipeline feeding mechanism includes an outer conveying pipeline (2-1), an annular guide frame (2-3), a second feeding wheel (2-4) installed at the bottom of the annular guide frame, an automatic feeding clamp, and a feeding cylinder (2-7). The annular guide frame is horizontally fixed inside the outer conveying pipeline. Several second feeding wheels are arranged from left to right at the bottom of the annular guide frame. Each of two adjacent second feeding wheels is driven to rotate by a chain. One end of the outer conveying pipeline is connected to the guide box, and an electric heating tube is also provided on its inner wall. The semi-annular feeding frame is flush with the annular guide frame under the drive of the telescopic cylinder. The other end of the outer conveying pipeline extends directly above the feeding station of the annular heating furnace and is sealed. A feeding port is opened at the bottom of the outer conveying pipeline directly opposite the feeding station. The feeding cylinder is installed at the top of the outer conveying pipeline directly above the feeding port. The output shaft end of the feeding cylinder extends into the outer conveying pipeline and is connected to the automatic feeding clamp.

5. The efficient manufacturing process for a convex lens for automotive lenses according to claim 4, characterized in that: The automatic feeding fixture includes a mounting plate (2-6), a limiting gripper (2-5), and a contact block (2-9) on the outer wall of the limiting gripper. The output shaft end of the feeding cylinder is connected to the top of the horizontally mounted mounting plate. A limiting gripper is provided on the front and rear sides of the left and right ends of the mounting plate. The two limiting grippers on the same end are arranged opposite each other and there is a gap between their lower ends. The gap between the lower ends of the two limiting grippers is less than the width of the glass body. The upper end of the limiting gripper is rotatably connected to the mounting plate through a connector (2-8). A torsion spring structure is also provided between the connector and the mounting plate.

6. The efficient manufacturing process for a convex lens for automotive applications according to claim 4, characterized in that: A rubber anti-collision block (2-2) is provided on the inner wall of the sealed end of the external conveying pipe.

7. The efficient manufacturing process for a convex lens for automotive applications according to claim 2, characterized in that: The annular heating furnace includes a circular worktable (3-1), a heating outer cover (3-2), an annular rotating platform (3-3), and a glass placement rack assembly (3-7). The top of the circular worktable is provided with a mounting groove that matches the annular rotating platform. The annular rotating platform is rotatably connected in the mounting groove. The heating outer cover is arc-shaped and matches the annular rotating platform. The heating outer cover is fixed on the circular worktable above the annular rotating platform. Several glass placement rack assemblies are arranged in a circle on the annular rotating platform. The glass placement rack assemblies enter the heating outer cover in sequence as the annular rotating platform rotates.

8. The efficient manufacturing process for a convex lens for automotive lenses according to claim 7, characterized in that: The inner ring of the annular rotary table is provided with a toothed structure (3-6), and the top of the circular worktable is also provided with a groove that communicates with the mounting slot. A drive gear is rotatably connected in the groove, and the drive gear meshes with the toothed structure. The groove is sealed by a cover plate (3-4), and a servo motor (3-5) that drives the drive gear to rotate is also installed on the top of the cover plate.

9. The efficient manufacturing process for a convex lens for automotive applications according to claim 7, characterized in that: The glass body placement frame assembly consists of a base plate (3-7-1), a C-shaped placement frame (3-7-2), a spherical support block (3-7-3), and a side limiting baffle (3-7-5). Two C-shaped placement frames are fixed on the base plate by support rods (3-7-4). Each of the two C-shaped placement frames is placed facing upwards and has a side limiting baffle on its opposite side. Spherical support blocks are provided on the inner walls of both sides of the C-shaped placement frames. The C-shaped placement frames provide point support for the glass body through the spherical support blocks.

10. The efficient manufacturing process for a convex lens for automotive applications according to claim 9, characterized in that: Each of the base plates on both sides of the C-shaped placement rack is provided with an elastic touch rod assembly. The elastic touch rod assembly consists of a telescopic rod (3-7-7), a spring, and a fixed outer cylinder (3-7-6). The fixed outer cylinder is vertically installed on the base plate, and the lower end of the telescopic rod extends into the upper end of the fixed outer cylinder and is connected to it by the spring.

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