Semi-automatic loading machine
Through the design of the board and frame fixture and clamping parts of the semi-automatic plate-up machine, the automatic positioning and fixing of the PCB board is achieved, the problem of low manual loading efficiency is solved, and the processing quality and accuracy are improved.
Patent Information
- Application Number
- CN202210903818.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2022-07-29
- Publication Date
- 2025-08-29
- Estimated Expiration
- 2042-07-29
AI Technical Summary
During the processing of existing PCB boards, manual loading method is inefficient, difficult to ensure the quality of loading and assembly, and cannot meet the positioning requirements of high-precision plate output equipment.
The semi-automatic plate-up machine is adopted to realize the automatic positioning and fixing of the plate body through the cooperation of the plate and frame fixtures, the plate and frame locking parts and the plate body self-locking clamps, including the design of the base frame seat, the plate and frame fixtures, the plate and frame locking parts and the plate body self-locking clamps, which are used for batch assembly and positioning of PCB boards.
The processing quality and efficiency of PCB boards are improved, and the processing accuracy and production efficiency are ensured during plasma cleaning and etching.
Smart Images

Figure CN115258662B_ABST
Abstract
Description
Technical Field
[0001] The invention relates to a board loading technology, in particular to a semi-automatic board loading machine. Background Art
[0002] In the production process of various types of precision-machined boards, loading and unloading is a high-frequency scenario in the industry, and it is responsible for the flow and connection of workpieces between different processes. However, the traditional loading and unloading method using manual shifting has problems such as low precision and insufficient efficiency, which seriously restricts production efficiency. In particular, in the production and processing of PCB boards, since PCB boards are one of the important components of the electronics industry, various electronic devices, as long as they have electronic components such as integrated circuits, must use PCB boards to enable electrical interconnection between various components.
[0003] Conventional PCBs typically undergo a manufacturing process involving circuit drawing, printing, exposure, development, etching, stripping, solder masking, and welding. Etching, in particular, involves the use of an etchant on the surface of the material, under etching conditions, to completely remove all copper layers except those beneath the resist. Furthermore, conventional PCB fabrication requires placement on trays or fixtures, as these PCBs must be prevented from colliding with one another. Furthermore, the increasing use of high-precision plate output equipment used in gravure and pad printing, as well as in precision etching, necessitates positioning each PCB individually on a tray or fixture before etching or cleaning. This allows for automated transport, rapid, and accurate detection, and positioning during plasma etching or cleaning.
[0004] However, in the existing processing process, PCB boards are generally installed on trays or fixtures manually. This not only fails to effectively guarantee the loading and assembly quality, but also has low loading efficiency and wastes a lot of manpower. There is an urgent need to change the loading problem in the existing PCB board processing process. Summary of the Invention
[0005] The semi-automatic plate loading machine provided in the embodiment of the present invention realizes automatic positioning and loading of the plate body through the cooperation of the plate frame clamp, saves manpower and material resources, and effectively improves processing quality and processing efficiency.
[0006] The technical solution adopted by at least one embodiment of the present invention is:
[0007] Semi-automatic panel loading machine, used for batch assembly and positioning of panels, including:
[0008] The base frame is used to support and position the top horizontal table;
[0009] The plate frame fixture is used to support and fix the plate body, and the outer edge is positioned and locked on the table top of the base frame;
[0010] At least two sets of plate frame locking members are respectively placed on the outer edges of the two side frames corresponding to the plate frame clamp, and deflected at a certain angle or directly limit the plate frame clamp on the base frame seat from the upper side;
[0011] At least two groups of plate self-locking clamps are respectively placed on the two side frames corresponding to the plate-frame clamp, and are used to place the plate on the plate-frame clamp after overcoming the self-locking torque driven by external force and making way, and to press and lock the plate placed on the plate-frame clamp under the action of its own self-locking torque.
[0012] Preferably, the plate frame locking members are symmetrically distributed on both sides of the plate frame clamp in one or two pairs.
[0013] Preferably, each group of the plate frame locking parts includes an L-shaped locking block and a locking drive part. The locking drive part is installed on the lower side of the table top of the base frame seat, and drives the L-shaped locking block on the upper side of the table top through the rotating shaft to deflect in the reverse direction by a certain angle to vertically limit the plate frame clamp and deflect in the forward direction by a certain angle to release the vertical displacement limit of the plate frame clamp.
[0014] Preferably, each group of the plate frame locking members is composed of a plurality of floating wheels, and the plurality of floating wheels directly press the plate frame clamp onto the base frame seat from the upper side.
[0015] Preferably, at least two groups of plate self-locking clamps are respectively provided on each side frame of the plate frame clamp, each group of plate self-locking clamps includes a hinge-type pressure plate, a self-locking torsion spring and a lifting cylinder, the self-locking torsion spring is installed at the hinge of the hinge-type pressure plate, and the self-locking torsion spring drives the front free end of the hinge-type pressure plate to press and lock the plate placed on the plate frame clamp by self-expansion;
[0016] The lifting cylinder is installed on the lower side of the plate frame clamp. The abutting push rod of the lifting cylinder driving center passes through the frame of the plate frame clamp from the bottom side of the plate frame clamp and abuts against the lower side of the free end of the hinged pressure plate. After the abutting push rod overcomes the locking force of the self-locking torsion spring, it pushes the free end of the hinged pressure plate to deflect and displace, and then releases the buckle lock on the plate body.
[0017] Preferably, all the plate self-locking clamps are symmetrically distributed in one pair or three pairs on the borders on both sides of the plate frame clamp.
[0018] Preferably, all the self-locking clamps of the plate body on both sides of the plate frame clamp are driven by the first jacking assembly and the second jacking assembly provided on the lower side of the base frame seat respectively, and the self-locking clamps of the plate body include three pairs of symmetrically arranged hinged pressure plates, a pair of symmetrically arranged hinged pressure strip plates for pressing the entire side edge of the plate body and a self-locking torsion spring, and the self-locking torsion springs installed at the hinges of each combination of hinged pressure plates and each combination of hinged pressure strip plates respectively push their respective free ends to press and lock the plate body placed on the plate frame clamp;
[0019] A pair of symmetrically arranged hinged batten boards push the free ends on both sides of each set of hinged batten boards to rise or fall synchronously through the synchronous action of the first lifting assembly and the second lifting assembly disposed on both sides.
[0020] Preferably, a pushing assembly is also provided on the base frame seat corresponding to the middle part of the plate frame clamp for lifting and raising the unlocked plate body for easy movement and taking. The pushing assembly includes a lifting plate recessed on the top side of the base frame seat table, a pushing cylinder located on the lower side of the base frame seat table and a plurality of guide slides located on the lower side of the base frame seat table for guiding the lifting plate to rise and fall. The plurality of guide slides are evenly installed around the lower side of the lifting plate, and the pushing cylinder pushes the lifting plate to rise and fall along the guide slides.
[0021] Preferably, the table top of the base frame is further provided with positioning angle irons which are arranged corresponding to the four corners of the plate frame clamp and are used for positioning and fixing the plate frame clamp.
[0022] Preferably, the inner edge of the frame of the plate-frame clamp is further recessed to provide a stepped surface for placing and fixing the plate.
[0023] The beneficial effects of the present invention are:
[0024] In the present invention, when the board is loaded, especially in the process of loading and processing PCB boards in the electronics industry, the effective cooperation of the board frame clamp, the board frame locking part, the board self-locking clamp and the jacking assembly is realized to realize the automatic control of the positioning and fixation of the board, which is convenient for batch assembly and positioning, and effectively improves the production efficiency and the processing accuracy on the subsequent automated production line.
[0025] Moreover, during plasma cleaning and plasma etching of PCB boards, the effective cooperation of the board frame fixture, the board frame locking parts and the board body self-locking clamping parts facilitates batch automatic positioning and fixing of PCB boards, effectively improving the processing accuracy and production efficiency in plasma cleaning and plasma etching. BRIEF DESCRIPTION OF THE DRAWINGS
[0026] Figure 1 2 is a schematic diagram of a left-side stereoscopic structure of the first embodiment of the present invention;
[0027] Figure 2 is a schematic diagram of the right-side stereoscopic structure of the first embodiment of the present invention;
[0028] Figure 3 This is a schematic front view of the three-dimensional structure of the first embodiment of the present invention with part of the base frame removed;
[0029] Figure 4 This is a schematic side view of the three-dimensional structure of the first embodiment of the present invention with part of the base frame removed;
[0030] Figure 5 This is a schematic diagram of the three-dimensional structure of the embodiment 1 of the present invention after removing part of the base frame from the front side;
[0031] Figure 6 This is a schematic diagram of the three-dimensional structure of the embodiment 1 of the present invention after a portion of the base frame is removed, viewed from the side;
[0032] Figure 7 is a schematic diagram of the right-side stereoscopic structure of the second embodiment of the present invention;
[0033] Figure 8 This is a schematic diagram of the left-side stereoscopic structure of the second embodiment of the present invention with part of the frame removed;
[0034] Figure 9 This is a schematic diagram of the right-side stereoscopic structure of the second embodiment of the present invention with part of the frame removed;
[0035] Figure 10 It is a structural schematic diagram of the plate frame clamp and the plate self-locking clamp in the second embodiment of the present invention. DETAILED DESCRIPTION
[0036] 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. 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.
[0037] It should be noted that the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Therefore, features defined as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.
[0038] Example 1
[0039] The semi-automatic loading machine provided in this embodiment is used for batch assembly and positioning of substrate boards or PCB boards before loading. Figures 1 to 4As shown, it includes a base frame 1, a board frame clamp 2, six groups of board frame locking parts 3 and eight groups of plate self-locking clamps 4. The base frame 1 is used to support and position the table 5 horizontally set at the top; the board frame clamp 2 is a square frame structure, which is used to support and fix the PCB board, and the outer edge is limited and fixed on the table 5 at the top of the base frame 1; the six groups of board frame locking parts 3 are respectively placed on the outer edges of the two side frames corresponding to the board frame clamp 2, and are deflected at a certain angle to limit and fix the board frame clamp 2 on the table 5 of the base frame 1, among which four groups of board frame locking parts 3 are symmetrically distributed in two pairs on the two side frames corresponding to the board frame clamp 2, and the other two groups of board frame locking parts 3 are symmetrically distributed in a pair on the other two side frames corresponding to the board frame clamp 2.
[0040] Each set of plate frame locking members 3 includes an L-shaped locking block 30 and a locking drive unit 31. The locking drive unit 31 is installed on the lower side of the table 5 of the base frame 1 and drives the L-shaped locking block 30 on the upper side of the table 5 to deflect in the opposite direction by a certain angle to limit the plate frame fixture 2 and to deflect in the forward direction by a certain angle to release the vertical limit of the plate frame fixture 2. In this embodiment, the locking drive unit 31 is an angular rotary cylinder. Of course, the locking drive unit can also be a drive motor. The function of the plate frame locking members 3 is to limit the vertical displacement of the plate frame fixture 2 and prevent the entire plate frame fixture 2 from being lifted when the pushing component on the bottom side of the plate frame fixture 2 pushes the substrate plate or PCB board vertically. In the process of achieving the vertical limit of the plate frame fixture 2 by the plate frame locking members 3, the frame locking members 3 do not contact or rub against the frame of the plate frame fixture 2, so as to avoid the generation of dust particles that adhere to the plate frame fixture 2 or the PCB board and affect the etching effect.
[0041] like Figures 1 to 6 As shown, eight sets of self-locking plate clamps 4 are grouped and symmetrically placed on the corresponding side frames of the board frame fixture 2. Driven by an external force, they open and give way to overcome the self-locking torque, allowing them to be placed and installed on the board frame fixture 2. The self-locking torque acts as a downward pressure buckle to lock the PCB placed on the board frame fixture 2. The eight sets of self-locking plate clamps 4 are symmetrically distributed in three pairs on the corresponding side frames of the board frame fixture 2, and the other two sets of self-locking plate clamps 4 are symmetrically distributed in a pair on the other two side frames of the board frame fixture 2.
[0042] Continue as Figures 1 to 6 As shown, all the plate self-locking clamps 4 on both sides of the plate frame clamp 2 are driven by the first jacking assembly 6 and the second jacking assembly 7 arranged on the lower side of the base frame seat 1 table 5 respectively. Each group of plate self-locking clamps 4 includes three pairs of symmetrically arranged hinged pressure plates 40, a pair of symmetrically arranged hinged pressure strips 41 for pressing the entire side edge of the PCB board, and a self-locking torsion spring 42. The self-locking torsion springs 42 installed at the hinges of each combination of hinged pressure plates 40 and each combination of hinged pressure strips 41 respectively push their respective free ends to press and lock the PCB board placed on the plate frame clamp 2.
[0043] Continue as Figures 1 to 6 As shown, the first jacking assembly 6 and the second jacking assembly both include a jacking base 60, a jacking cylinder 61, two groups of linear bearings 62, a connecting beam 63 and five groups of abutting jacks 64. The two groups of linear bearings 62 are vertically installed at both ends of the jacking base 60, and the two ends of the connecting beam 63 are fixed on the two groups of linear bearings 62. The jacking cylinder 61 is installed in the middle of the jacking base 60 and pushes the connecting beam 63 up and down along the linear bearings 62. Five groups of abutting push rods 64 are installed on the connecting beam 63 and pass through the table 5 of the base frame 1, and the top ends of the five groups of abutting push rods 64 respectively abut the free ends of the three-group leaf-type pressure plates 40 and the two-group leaf-type pressure strip plates 41 on the same side of the plate frame fixture 2 from the lower side, and overcome the locking force of the self-locking torsion spring 42 to push each free end to be synchronously deflected and positioned to release the pressure lock of the PCB board or synchronously deflect and position it for the plate frame fixture 2 to install the PCB board; a pair of symmetrically arranged hinged pressure strip plates 41 are synchronously moved by the first jacking component 6 and the second jacking component on both sides to push the free ends on both sides of each group of leaf-type pressure strip plates 41 to rise or fall synchronously.
[0044] Continue as Figures 1 to 6 As shown, a pushing assembly 8 for lifting and lifting the unlocked PCB board for easy movement and taking is also provided on the base frame seat 1 table 5 corresponding to the middle part of the plate frame clamp 2. The pushing assembly 8 includes a lifting plate 80 recessed on the top side of the base frame seat 1 table 5, a pushing cylinder 81 located on the lower side of the base frame seat 1 table 5 and four guide slides 82 located on the lower side of the base frame seat 1 table 5 for guiding the lifting plate 80 to rise and fall. The four guide slides 82 are evenly installed around the lower side of the lifting plate 80, and the pushing cylinder 81 pushes the lifting plate 80 to rise and fall along the guide slides 82.
[0045] In addition, positioning angle irons 9 are provided on the table top 5 of the base frame 1, which are corresponding to the four corners of the plate frame fixture 2 and are used to position and fix the plate frame fixture 2. The inner edge of the frame of the plate frame fixture 2 is also recessed to provide a step surface 20 for placing and fixing the PCB board.
[0046] In this embodiment, during the loading and unloading process, the PCB board is positioned and supported by the board frame clamp 2, and then the board frame locking part 3, the board self-locking clamp 4 and the push assembly 8 cooperate effectively to realize the automatic positioning and fixation of the PCB board, which effectively facilitates the subsequent cleaning or etching processing, realizes batch processing operations, effectively prevents the collision of PCB boards during the production process, and effectively improves the production efficiency and processing accuracy on the production line.
[0047] Example 2
[0048] like Figures 7 to 10As shown, the difference between this embodiment and the first embodiment is that the two sets of plate frame locking members 3 are respectively placed on the outer edges of the two side frames corresponding to the plate frame clamp 2. The two sets of plate frame locking members 3 directly press the plate frame clamp 2 to fix it on the base frame seat 1 from the upper side. In this embodiment, the base frame seat is composed of multiple floating wheels 10, and each set of plate frame locking members 3 is also composed of multiple floating wheels. Figures 7 to 9 Only the floating wheels on one side of the frame clamp 2 and the frame connected thereto are shown, and the floating wheels on the other side of the frame clamp 2 are not shown in the figure; when working, each set of frame locking members directly presses and locks the frame clamp 2 onto the multiple floating wheels on the base frame seat 1 from the upper side.
[0049] like Figure 10 As shown, eight groups of plate self-locking clamps 4 are evenly distributed on the four side frames of the plate frame clamp 2 along the circumferential direction. Each group of plate self-locking clamps 4 includes a hinge-type pressure plate 40 and a self-locking torsion spring 42. The self-locking torsion spring 42 is installed at the hinge of the hinge-type pressure plate 40 and presses the PCB board placed on the plate frame clamp 2 with the free end of the self-opening driving front side. A lifting cylinder 61 is provided on the lower side of the plate frame clamp 2 corresponding to each group of plate self-locking clamps 4. When working, all The lifting cylinder 61 synchronously drives the abutting push rod 64 in the center from the bottom side upward through the frame and abuts the lower side of the free ends of all pressure plates 40 from the bottom side, and overcomes the locking force of the self-locking torsion spring 42 to push the free ends of each pressure plate 40 to deflect and displace, thereby releasing the buckle lock on the PCB board, facilitating the positioning and fixation of the PCB board on the plate frame fixture 2 after automatic loading by the loading and unloading clamps, and automatic grasping during unloading after processing.
[0050] In the description of the present invention, it should be noted that the terms "top", "bottom", "upper", "lower", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the inventive product is conventionally placed when in use. 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 should not be understood as limiting the present invention.
[0051] The above-described embodiments are merely preferred embodiments of the present invention and are not intended to limit the scope of implementation of the present invention. Any equivalent changes made based on the shape, structure and principle of the present invention should be included in the scope of protection of the present invention.
Claims
1. Semi-automatic board loading machine, used for batch assembly and positioning of boards, characterized by: include: A base frame (1) is used to support and position a top horizontally arranged tabletop (5); A plate frame clamp (2) is used to support and fix the plate body, and the outer edge is limitedly fixed on the table (5) at the top end of the base frame seat (1); At least two sets of plate frame locking members (3) are respectively placed on the outer edges of the two side frames corresponding to the plate frame clamp (2), and deflected at a certain angle or directly limit the plate frame clamp (2) on the base frame seat (1) from the upper side; At least two sets of plate self-locking clamping members (4) are respectively placed on the two side frames corresponding to the plate frame clamp (2), and are used to place the plate on the plate frame clamp (2) after overcoming the self-locking torque driven by external force and making way for the plate, and to press and lock the plate placed on the plate frame clamp (2) under the action of its own self-locking torque; At least two groups of plate self-locking clamps (4) are respectively provided on each side frame of the plate frame clamp (2), and each group of plate self-locking clamps (4) includes a hinge-type pressure plate (40), a self-locking torsion spring (42) and a lifting cylinder (61), wherein the self-locking torsion spring (42) is installed at the hinge of the hinge-type pressure plate (40), and the self-locking torsion spring (42) drives the front free end of the hinge-type pressure plate (40) to press and lock the plate placed on the plate frame clamp (2) in a self-expanding manner; The lifting cylinder (61) is installed on the lower side of the plate frame clamp (2), and the abutting push rod (64) at the driving center of the lifting cylinder (61) passes through the frame of the plate frame clamp (2) from the bottom side of the plate frame clamp (2) upward, abuts against the lower side of the free end of the hinge type pressure plate (40), overcomes the locking force of the self-locking torsion spring (42), and pushes the free end of the hinge type pressure plate (40) to deflect and displace, thereby releasing the buckle lock on the plate body.
2. The semi-automatic loading machine according to claim 1, characterized in that: The plate frame locking pieces (3) are symmetrically distributed on both sides of the plate frame clamp (2) in one or two pairs.
3. The semi-automatic loading machine according to claim 1 or 2, characterized in that: Each set of the plate frame locking members (3) comprises an L-shaped locking block (30) and a locking driving portion (31). The locking driving portion (31) is mounted on the lower side of the table (5) of the base frame seat (1) and drives the L-shaped locking block (30) on the upper side of the table (5) to deflect in the reverse direction by a certain angle to vertically limit the plate frame clamp (2) and to deflect in the forward direction by a certain angle to release the vertical displacement limit of the plate frame clamp (2).
4. The semi-automatic loading machine according to claim 2, characterized in that: Each set of the plate frame locking members (3) is composed of a plurality of floating wheels, and the plurality of floating wheels directly press the plate frame clamp (2) from the upper side to limit the position on the base frame seat (1).
5. The semi-automatic loading machine according to claim 1, characterized in that: Positioning angle irons (9) are also provided on the tabletop (5) of the base frame seat (1) and are arranged correspondingly to the four corners of the plate frame fixture (2) and used for positioning and fixing the plate frame fixture (2).
6. The semi-automatic loading machine according to claim 1, characterized in that: The inner edge of the frame of the plate-frame clamp (2) is also recessed in the circumferential direction to provide a stepped surface (20) for placing and fixing the plate.
7. Semi-automatic board loading machine, used for batch assembly and positioning of boards, characterized by: include: A base frame (1) is used to support and position a top horizontally arranged tabletop (5); A plate frame clamp (2) is used to support and fix the plate body, and the outer edge is limitedly fixed on the table (5) at the top end of the base frame seat (1); At least two sets of plate frame locking members (3) are respectively placed on the outer edges of the two side frames corresponding to the plate frame clamp (2), and deflected at a certain angle or directly limit the plate frame clamp (2) on the base frame seat (1) from the upper side; At least two sets of plate self-locking clamping members (4) are respectively placed on the two side frames corresponding to the plate frame clamp (2), and are used to place the plate on the plate frame clamp (2) after overcoming the self-locking torque driven by external force and making way for the plate, and to press and lock the plate placed on the plate frame clamp (2) under the action of its own self-locking torque; All the plate self-locking clamps (4) are symmetrically distributed in pairs or three pairs on the frames on both sides of the plate frame clamp (2); All the plate self-locking clamps (4) on both sides of the plate frame clamp (2) are driven by the first jacking assembly (6) and the second jacking assembly provided on the lower side of the base frame seat (1) table (5), respectively. All the plate self-locking clamps (4) include three pairs of symmetrically arranged hinged pressure plates (40), a pair of symmetrically arranged hinged pressure strips (41) for pressing the entire side edge of the plate body, and a self-locking torsion spring (42). The self-locking torsion springs installed at the hinges of each combination of hinged pressure plates (40) and each combination of hinged pressure strips (41) respectively push their free ends to press and lock the PCB board placed on the plate frame clamp (2); the eight groups of plate self-locking clamps (4) are symmetrically distributed in three pairs on the two side frames corresponding to the plate frame clamp (2), and the other two groups of plate self-locking clamps (4) are symmetrically distributed in a pair on the other two side frames corresponding to the plate frame clamp (2); A pair of symmetrically arranged hinged batten boards (41) are driven to synchronously raise or lower the free ends of each pair of hinged batten boards (41) by the synchronous action of the first jacking assembly (6) and the second jacking assembly disposed on both sides.
8. The semi-automatic loading machine according to claim 7, characterized in that: The base frame seat (1) table (5) corresponding to the middle part of the plate frame clamp (2) is also provided with a pushing assembly (8) for lifting and lifting the unlocked plate body for easy movement and taking. The pushing assembly (8) includes a lifting plate (80) recessed on the top side of the base frame seat (1) table (5), a pushing cylinder (81) located on the lower side of the base frame seat (1) table (5) and a plurality of guide slides (82) located on the lower side of the base frame seat (1) table (5) for guiding the lifting plate (80) to rise and fall. The plurality of guide slides (82) are evenly installed around the lower side of the lifting plate (80), and the pushing cylinder (81) pushes the lifting plate (80) to rise and fall along the guide slides (82).
9. The semi-automatic loading machine according to claim 7, characterized in that: Positioning angle irons (9) are also provided on the tabletop (5) of the base frame seat (1) and are arranged correspondingly to the four corners of the plate frame fixture (2) and used for positioning and fixing the plate frame fixture (2).
10. The semi-automatic loading machine according to claim 7, characterized in that: The inner edge of the frame of the plate-frame clamp (2) is also recessed in the circumferential direction to provide a stepped surface (20) for placing and fixing the plate.
Citation Information
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