Rear rotating plate base for circuit board printing

Abstract

The invention relates to the related technical field of circuit board printing, in particular to a rear rotating plate base for circuit board printing, which comprises a panel, a limiting mechanism is arranged on the upper surface of the panel, an ejection mechanism is arranged on the inner side surface of a side plate, and a fixing mechanism is arranged on the upper surface of the panel. According to the rear rotating plate base for circuit board printing, through the arrangement of the fixing mechanism, a circuit board is firstly placed above the panel, then the ejection mechanism is started and drives the fixing block to move upwards, the fixing block drives the sliding block to slide upwards in the sliding groove, and the inclined face of the sliding block can extrude the fixing plate; when the circuit board is fixed, the fixing plate moves in the fixing groove in the horizontal direction and compresses the spring at the same time, and in the process that the spring is compressed, the fixing plate applies extrusion force to the circuit board placed on the surface of the panel, so that the circuit board is fixed, and the circuit board can be prevented from displacement and loosening; and the overall performance and reliability of the electronic equipment are improved.

Description

Technical Field

[0001] The present invention relates to the technical field related to circuit board printing, and in particular to a rear turntable base for circuit board printing. Background Art

[0002] In the booming modern electronics industry, circuit board printing, as a key link in electronic product manufacturing, is of undeniable importance. As electronic devices continue to move towards miniaturization, multifunctionality, and high performance, requirements for the precision, density, and reliability of circuit boards have been put forward. Traditional circuit board printing technology has gradually exposed many limitations in the face of increasingly complex circuit designs. For example, early screen printing processes have difficulty in accurately replicating tiny circuits and fine patterns, and are prone to printing defects such as blurred lines and broken lines, which seriously affect the electrical performance of circuit boards. Moreover, with the increasing awareness of environmental protection, some inks containing harmful chemicals such as lead and mercury used in traditional printing processes are strictly restricted, prompting the industry to seek more environmentally friendly and safer printing materials and processes. In addition, the market demand for rapid upgrades of electronic products requires circuit board printing to have higher production efficiency and shorter production cycles to meet the needs of large-scale, customized production. This has also become a major driving force for the continuous innovation of circuit board printing technology. During the circuit board printing process, it is usually necessary to transfer the printed circuit board to facilitate subsequent processing steps such as drying and testing. Therefore, a post-transfer base for circuit board printing is particularly needed.

[0003] However, existing rear rotation board bases are generally difficult to adapt to circuit boards of various sizes and specifications, and the fixing firmness and adjustment convenience are poor, which can easily cause the circuit boards to shift and loosen during processing and use, thereby affecting the overall performance and reliability of electronic equipment. Summary of the Invention

[0004] The purpose of the new invention is to provide a rear rotation plate base for printing circuit boards, so as to solve the problem that the existing rear rotation plate base proposed in the above background technology is generally difficult to adapt to circuit boards of various sizes, and the fixing firmness and adjustment convenience are poor, which easily causes the circuit board to shift and loosen during processing and use, thereby affecting the overall performance and reliability of the electronic equipment.

[0005] To achieve the above-mentioned object, the present invention provides the following technical solution: a rear turntable base for printed circuit boards, comprising a panel, a side panel fixedly connected to the lower surface of the panel, a bottom plate fixedly connected to the lower surface of the side panel, a limiting mechanism provided on the upper surface of the panel, an ejection mechanism provided on the inner surface of the side panel, and a fixing mechanism provided on the upper surface of the panel;

[0006] The fixing mechanism includes a fixing slot, a fixing plate, a spring, a baffle, a connecting block, a baffle, a limiting slot, a sliding slot, a sliding block, a limiting rod and a fixed block, the upper surface of the panel is provided with a fixing slot, the inner surface of the fixing slot is slidably connected to the fixing plate, the inner surface of the fixing plate is fixedly connected to a spring, one end of the spring is fixedly connected to the baffle, the lower surface of the baffle is slidably connected to the connecting block, the upper surface of the connecting block is provided with a baffle, the outer surface of the connecting block is provided with a limiting slot, the inner side of the connecting block is provided with a sliding slot, the inner surface of the sliding slot is slidably connected to the sliding block, the inner surface of the sliding block is fixedly connected to the limiting rod, and the lower surface of the sliding block is fixedly connected to the fixed block.

[0007] Preferably, the side panels are provided in multiple groups, and the fixing mechanisms are provided in multiple groups.

[0008] Preferably, the fixing grooves are provided in multiple groups on the surface of the panel, and the fixing plate forms a telescopic structure through a spring and a baffle.

[0009] Preferably, the inner dimension of the limiting groove matches the outer dimension of the limiting rod, and the inner dimension of the sliding groove matches the outer dimension of the sliding block.

[0010] Preferably, the limiting mechanism includes a stop block, a slot, a block, a placement plate and a fixing hole, the upper surface of the panel is fixedly connected to the stop block, a slot is provided on one side surface of the panel, the inner surface of the slot is slidably connected to the block, the lower surface of the block is fixedly connected to the placement plate, and the upper surface of the placement plate is provided with a fixing hole.

[0011] Preferably, the stoppers are provided in multiple groups on the upper surface of the panel, and the inner dimensions of the slots match the outer dimensions of the blocks.

[0012] Preferably, the card slots are provided in multiple groups on the upper surface of the panel, and the card blocks are provided in multiple groups on the surface of the placement plate.

[0013] Preferably, a plurality of fixing holes are provided on the upper surface of the placement plate, and the placement plate and the fixing block are fixedly connected.

[0014] Preferably, the ejection mechanism includes a rotating shaft, a rotating rod, a positioning block, a pulling handle, a positioning groove and a protrusion, the inner surface of the side plate is rotatably connected to the rotating shaft, one side surface of the rotating shaft is fixedly connected to the rotating rod, the other side surface of the rotating shaft is fixedly connected to the positioning block, the outer surface of the positioning block is slidably connected to the pulling handle, a positioning groove is provided on one side surface of the pulling handle, and the outer surface of the rotating rod is fixedly connected to the protrusion.

[0015] Preferably, the outer dimensions of the positioning block match the outer dimensions of the positioning groove, and the protrusions are provided in multiple groups on the surface of the rotating rod.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: the rear rotating plate base for printing a circuit board first places the circuit board on top of the panel through the setting of the fixing mechanism, and then the ejection mechanism is started and drives the fixed block to move upward, and the upward movement of the fixed block causes the sliding block connected thereto to start sliding upward in the sliding groove. During this process, the limit rod will also slide synchronously along the surface of the limit groove, and the limit groove can effectively limit and constrain the limit rod, thereby ensuring the stability and directionality of the movement of the sliding block. Since the top of the sliding block is constructed with an inclined surface, and the inclined surface matches the inclined surface of the lower surface of the fixed plate, when the sliding block moves upward, its inclined surface It will exert an extrusion effect on the fixing plate, causing the fixing plate to move horizontally in the fixing groove and compress the spring at the same time. During the compression of the spring, the fixing plate will exert an extrusion force on the circuit board placed on the panel surface, thereby fixing the circuit board. In this way, the circuit board can avoid displacement and loosening in subsequent processing links and actual use, thereby improving the overall performance and reliability of the electronic equipment. When the circuit board does not need to be fixed, the ejection mechanism is started again, the sliding block moves downward, and the compressed spring will rebound by its own elastic restoring force, allowing the fixing plate to move in the opposite direction, so that all components return to their initial state. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the side appearance structure of the present invention;

[0018] Figure 2 This is a schematic diagram of the structure of the panel and the fixing groove cooperating with each other in the present invention;

[0019] Figure 3 This is a schematic diagram of the structure of the side panels and bottom panel cooperating with each other in the present invention;

[0020] Figure 4 This is a schematic diagram of the structure of the placement plate and the fixing holes cooperating with each other in the present invention;

[0021] Figure 5 This is a schematic diagram of the ejection mechanism structure of the present invention;

[0022] Figure 6 This is a schematic diagram of the structure of the placement plate and the fixing block cooperating with each other in the present invention;

[0023] Figure 7 It is a structural schematic diagram of the fixing mechanism of the present invention.

[0024] In the figure: 1. panel; 2. side panel; 3. bottom plate; 4. limiting mechanism; 401. stop block; 402. slot; 403. block; 404. placement plate; 405. fixing hole; 5. ejection mechanism; 501. shaft; 502. rotating rod; 503. positioning block; 504. pull handle; 505. positioning slot; 506. protrusion; 6. fixing mechanism; 601. fixing slot; 602. fixing plate; 603. spring; 604. baffle; 605. connecting block; 606. stop slot; 607. limiting slot; 608. sliding slot; 609. sliding block; 610. limiting rod; 611. fixing block. DETAILED DESCRIPTION

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

[0026] See also Figure 1-7 The present invention provides a technical solution: a rear turntable base for printed circuit boards, comprising a panel 1, a side panel 2 fixedly connected to the lower surface of the panel 1, a bottom plate 3 fixedly connected to the lower surface of the side panel 2, a limiting mechanism 4 provided on the upper surface of the panel 1, an ejection mechanism 5 provided on the inner surface of the side panel 2, and a fixing mechanism 6 provided on the upper surface of the panel 1;

[0027] The fixing mechanism 6 includes a fixing groove 601, a fixing plate 602, a spring 603, a baffle 604, a connecting block 605, a baffle 606, a limiting groove 607, a sliding groove 608, a sliding block 609, a limiting rod 610 and a fixing block 611. The upper surface of the panel 1 is provided with a fixing groove 601, the inner surface of the fixing groove 601 is slidably connected to the fixing plate 602, the inner side of the fixing plate 602 is fixedly connected to the spring 603, one end of the spring 603 is fixedly connected to the baffle 604, the lower surface of the baffle 604 is slidably connected to the connecting block 605, the upper surface of the connecting block 605 is provided with a baffle 606, the outer surface of the connecting block 605 is provided with a baffle 604, and the fixing plate 602 is fixedly connected to the spring 603. A limiting groove 607 is provided on the surface, a sliding groove 608 is provided on the inner side of the connecting block 605, a sliding block 609 is slidably connected to the inner surface of the sliding groove 608, a limiting rod 610 is fixedly connected to the inner side of the sliding block 609, and a fixed block 611 is fixedly connected to the lower surface of the sliding block 609. Through the arrangement of the fixing groove 601, the fixing plate 602, the spring 603, the baffle 604, the connecting block 605, the blocking groove 606, the limiting groove 607, the sliding groove 608, the sliding block 609, the limiting rod 610 and the fixed block 611, when in use, the circuit board is first placed on the top of the panel 1, and then the ejection mechanism 5 is started and drives the fixed block 61 1 moves upward, and the upward movement of the fixed block 611 causes the sliding block 609 connected thereto to start sliding upward in the sliding groove 608. During this process, the limiting rod 610 will also slide synchronously along the surface of the limiting groove 607. The limiting groove 607 can effectively limit and constrain the limiting rod 610, thereby ensuring the stability and direction of the movement of the sliding block 609. Since the top of the sliding block 609 is constructed with an inclined surface, and the inclined surface matches the inclined surface of the lower surface of the fixed plate 602, when the sliding block 609 moves upward, its inclined surface will squeeze the fixed plate 602, causing the fixed plate 602 to slide along the water in the fixed groove 601. The spring 603 is compressed while the fixing plate 602 is exerting an extruding force on the circuit board placed on the surface of the panel 1 during compression of the spring 603. In this way, the circuit board can be prevented from being displaced or loosened during subsequent processing and actual use, thereby improving the overall performance and reliability of the electronic device. When the circuit board does not need to be fixed, the ejection mechanism 5 is started again, the sliding block 609 moves downward, and the compressed spring 603 rebounds by its own elastic restoring force, allowing the fixing plate 602 to move in the opposite direction, so that each component returns to its initial state.

[0028] Furthermore, the side panels 2 are provided with multiple groups, and the fixing mechanisms 6 are provided with multiple groups. Through the setting of the fixing mechanisms 6, when in use, the multiple groups of fixing mechanisms 6 are distributed on the panel 1, and the fixing force and limiting effect are applied to the circuit board from multiple directions at the same time, and they work together to ensure that the circuit board can be firmly and stably installed on the panel 1, effectively preventing it from displacement, loosening and other adverse phenomena when subjected to external forces or during the operation of the equipment, thereby ensuring the accuracy and reliability of related operations.

[0029] Furthermore, multiple groups of fixing grooves 601 are provided on the surface of the panel 1, and the fixing plate 602 forms a telescopic structure through the spring 603 and the baffle 604. Through the setting of the fixing groove 601, when in use, the fixing plate 602 will slide on the surface of the fixing groove 601, and the fixing groove 601 limits the fixing plate 602, making the movement of the fixing plate 602 more stable.

[0030] Furthermore, the inner dimension of the limiting groove 607 matches the outer dimension of the limiting rod 610, and the inner dimension of the sliding groove 608 matches the outer dimension of the sliding block 609. Through the setting of the sliding groove 608 and the sliding block 609, when in use, the sliding block 609 moves on the inner side of the sliding groove 608, and the sliding groove 608 limits the sliding block 609, making the movement of the sliding block 609 more stable.

[0031] Furthermore, the limiting mechanism 4 includes a stopper 401, a slot 402, a block 403, a placement plate 404 and a fixing hole 405. The upper surface of the panel 1 is fixedly connected with the stopper 401, and a slot 402 is provided on one side surface of the panel 1. The inner surface of the slot 402 is slidably connected with the block 403. The lower surface of the block 403 is fixedly connected with the placement plate 404, and the upper surface of the placement plate 404 is provided with a fixing hole 405. Through the arrangement of the stopper 401, the slot 402, the block 403, the placement plate 404 and the fixing hole 405, when in use, the slot 402 can clamp the block 403 at the corner of the placement plate 404. With the help of the fit between the slot 402 and the block 403, the placement plate 404 is preliminarily determined. 04, and then, according to actual needs, the adapted block 403 can be installed through the fixing hole 405 on the placement plate 404. Then, when the circuit board is placed on the surface of the panel 1, the block 401 on the panel 1 will limit the four corners of the circuit board to prevent it from deviating significantly in the plane. At the same time, the block 403 pre-installed at the fixing hole 405 will support the circuit board, providing a stable fulcrum for the circuit board from below, so that the subsequent fixing mechanism 6 can be more stable when fixing the circuit board, avoiding poor fixing effect or damage to the circuit board due to unstable support, thereby ensuring that the entire device can achieve accurate and stable limiting and fixing functions when processing the circuit board.

[0032] Furthermore, multiple groups of blocks 401 are provided on the upper surface of the panel 1, and the inner dimensions of the slots 402 match the outer dimensions of the blocks 403. Through the setting of the slots 402 and the blocks 403, when in use, the slots 402 can limit the blocks 403 so that the position of the placement plate 404 can be determined.

[0033] Furthermore, multiple groups of card slots 402 are provided on the upper surface of the panel 1, and multiple groups of card blocks 403 are provided on the surface of the placement plate 404. Through the setting of the card blocks 403, when in use, the card blocks 403 will support the circuit board and provide a stable fulcrum for the circuit board from below, so that the subsequent fixing mechanism 6 can be more stable when fixing the circuit board.

[0034] Furthermore, multiple groups of fixing holes 405 are provided on the upper surface of the placement plate 404, and the placement plate 404 and the fixing block 611 are fixedly connected. Through the setting of the fixing holes 405, when in use, the adaptive card block 403 can be installed through the fixing holes 405 on the placement plate 404 according to actual needs, making the use of the equipment more flexible.

[0035] Furthermore, the ejection mechanism 5 includes a rotating shaft 501, a rotating rod 502, a positioning block 503, a trigger handle 504, a positioning groove 505 and a protrusion 506. The inner surface of the side plate 2 is rotatably connected to the rotating shaft 501, one side surface of the rotating shaft 501 is fixedly connected to the rotating rod 502, the other side surface of the rotating shaft 501 is fixedly connected to the positioning block 503, the outer surface of the positioning block 503 is slidably connected to the trigger handle 504, one side surface of the trigger handle 504 is provided with a positioning groove 505, the outer surface of the rotating rod 502 is fixedly connected to the protrusion 506, and the rotating shaft 501, the rotating rod 502, the positioning block 503, the trigger handle 504, the positioning groove 505 and the protrusion 506 are fixedly connected to the outer surface of the side plate 2. The arrangement of the groove 505 and the protrusion 506 is such that when in use, the handle 504 is operated. Since the positioning block 503 is fixedly connected to the rotating shaft 501 and the rotating shaft 501 is rotatably connected to the inner surface of the side panel 2, the positioning groove 505 on the surface of the handle 504 will drive the rotation of the positioning block 503, thereby driving the rotating shaft 501 to rotate synchronously, and the rotating rod 502 fixedly connected to one side of the rotating shaft 501 will also rotate accordingly. The protrusion 506 fixed on the outer surface of the rotating rod 502 will move with the rotation of the rotating rod 502, and the protrusion 506 will contact the placement plate 404 and generate a force, causing the placement plate 404 to move upward, thereby driving the fixed block 611 to move upward.

[0036] Furthermore, the outer dimensions of the positioning block 503 match the outer dimensions of the positioning groove 505, and multiple groups of protrusions 506 are arranged on the surface of the rotating rod 502. Through the arrangement of the protrusions 506, when in use, multiple groups of protrusions 506 can synchronously squeeze the placement plate 404 during rotation, making the movement of the placement plate 404 more stable.

[0037] Working principle: the card slot 402 can clamp the card block 403 at the corner of the placement plate 404. With the help of the fitting relationship between the card slot 402 and the card block 403, the position of the placement plate 404 is preliminarily determined. Afterwards, the adapted card block 403 can be installed through the fixing hole 405 on the placement plate 404 according to actual needs. Then, when the circuit board is placed on the surface of the panel 1, the stop block 401 on the panel 1 will limit the four corners of the circuit board to prevent it from deviating significantly in the plane. At the same time, the card block 403 pre-installed at the fixing hole 405 will support the circuit board and provide a stable fulcrum for the circuit board from below, so that the subsequent fixing mechanism 6 can The fixing operation can be more stable, avoiding poor fixing effect or damage to the circuit board due to unstable support, thereby ensuring that the entire device can achieve accurate and stable limiting and fixing functions when processing the circuit board. Subsequently, the handle 504 is operated. Since the positioning block 503 is fixedly connected to the rotating shaft 501 and the rotating shaft 501 is rotatably connected to the inner surface of the side plate 2, the positioning groove 505 on the surface of the handle 504 will drive the rotation of the positioning block 503, and then drive the rotating shaft 501 to rotate synchronously, and the rotating rod 502 fixedly connected to one side of the rotating shaft 501 will also rotate accordingly, and the protrusion 506 fixed on the outer surface of the rotating rod 502 will move with the rotation of the rotating rod 502, and the protrusion 506 will move with the placement board 404 contacts and generates a force, causing the placement plate 404 to move upward, thereby driving the fixed block 611 to move upward, and the upward movement of the fixed block 611 causes the sliding block 609 connected thereto to start sliding upward in the sliding groove 608. During this process, the limiting rod 610 will also slide synchronously along the surface of the limiting groove 607, and the limiting groove 607 can effectively limit and constrain the limiting rod 610, thereby ensuring the stability and direction of the movement of the sliding block 609. Since the top of the sliding block 609 is constructed with an inclined surface, and the inclined surface matches the inclined surface of the lower surface of the fixed plate 602, when the sliding block 609 moves upward, its inclined surface will produce an extrusion effect on the fixed plate 602, causing The fixing plate 602 is moved horizontally in the fixing groove 601, and the spring 603 is compressed at the same time. When the spring 603 is compressed, the fixing plate 602 applies an extrusion force to the circuit board placed on the surface of the panel 1, thereby fixing the circuit board. In this way, the circuit board can avoid displacement and loosening during subsequent processing and actual use, thereby improving the overall performance and reliability of the electronic device. When the circuit board does not need to be fixed, the ejection mechanism 5 is started again, the sliding block 609 moves downward, and the compressed spring 603 rebounds by its own elastic restoring force, allowing the fixing plate 602 to move in the opposite direction, so that all components return to their initial state.

[0038] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A rear turntable base for printed circuit boards, comprising a panel (1), characterized in that: The lower surface of the panel (1) is fixedly connected to a side panel (2), the lower surface of the side panel (2) is fixedly connected to a bottom panel (3), the upper surface of the panel (1) is provided with a limiting mechanism (4), the inner surface of the side panel (2) is provided with an ejection mechanism (5), and the upper surface of the panel (1) is provided with a fixing mechanism (6); The fixing mechanism (6) comprises a fixing groove (601), a fixing plate (602), a spring (603), a baffle (604), a connecting block (605), a baffle groove (606), a limiting groove (607), a sliding groove (608), a sliding block (609), a limiting rod (610) and a fixing block (611). The upper surface of the panel (1) is provided with a fixing groove (601), the inner surface of the fixing groove (601) is slidably connected to the fixing plate (602), the inner side of the fixing plate (602) is fixedly connected to the spring (603), and one end of the spring (603) is fixedly connected to the fixing plate (602). A baffle (604) is connected, the lower surface of the baffle (604) is slidably connected to a connecting block (605), the upper surface of the connecting block (605) is provided with a blocking groove (606), the outer surface of the connecting block (605) is provided with a limiting groove (607), the inner side of the connecting block (605) is provided with a sliding groove (608), the inner surface of the sliding groove (608) is slidably connected to a sliding block (609), the inner side of the sliding block (609) is fixedly connected to a limiting rod (610), and the lower surface of the sliding block (609) is fixedly connected to a fixed block (611).

2. The rear turn plate base for printed circuit board according to claim 1, characterized in that: The side panels (2) are provided in multiple groups, and the fixing mechanisms (6) are provided in multiple groups.

3. The rear turn plate base for printed circuit board according to claim 1, characterized in that: The fixing grooves (601) are provided in multiple groups on the surface of the panel (1), and the fixing plate (602) forms a telescopic structure through a spring (603) and a baffle (604).

4. The rear turn plate base for printed circuit board according to claim 1, characterized in that: The inner dimension of the limiting groove (607) matches the outer dimension of the limiting rod (610), and the inner dimension of the sliding groove (608) matches the outer dimension of the sliding block (609).

5. The rear turn plate base for printed circuit board according to claim 1, characterized in that: The limiting mechanism (4) comprises a stopper (401), a slot (402), a block (403), a placement plate (404) and a fixing hole (405); the upper surface of the panel (1) is fixedly connected to the stopper (401); a slot (402) is provided on one side surface of the panel (1); the inner surface of the slot (402) is slidably connected to the block (403); the lower surface of the block (403) is fixedly connected to the placement plate (404); and the upper surface of the placement plate (404) is provided with a fixing hole (405).

6. The rear turn plate base for printed circuit board according to claim 5, characterized in that: The stoppers (401) are provided in multiple groups on the upper surface of the panel (1), and the inner dimensions of the card slots (402) match the outer dimensions of the card blocks (403).

7. The rear turn plate base for printed circuit board according to claim 5, characterized in that: The card slots (402) are provided in multiple groups on the upper surface of the panel (1), and the card blocks (403) are provided in multiple groups on the surface of the placement plate (404).

8. The rear turn plate base for printed circuit board according to claim 5, characterized in that: The fixing holes (405) are provided in multiple groups on the upper surface of the placement plate (404), and the placement plate (404) and the fixing block (611) are fixedly connected.

9. The rear turn plate base for printed circuit board according to claim 1, characterized in that: The ejection mechanism (5) comprises a rotating shaft (501), a rotating rod (502), a positioning block (503), a toggle handle (504), a positioning groove (505) and a protrusion (506); the inner surface of the side plate (2) is rotatably connected to the rotating shaft (501); one side surface of the rotating shaft (501) is fixedly connected to the rotating rod (502); the other side surface of the rotating shaft (501) is fixedly connected to the positioning block (503); the outer surface of the positioning block (503) is slidably connected to the toggle handle (504); one side surface of the toggle handle (504) is provided with a positioning groove (505); the outer surface of the rotating rod (502) is fixedly connected to the protrusion (506).

10. The rear turn plate base for printed circuit board according to claim 9, characterized in that: The outer dimensions of the positioning block (503) match the outer dimensions of the positioning groove (505), and multiple groups of the protrusions (506) are provided on the surface of the rotating rod (502).

Images