Bridge support base plate turning clamping tool

Abstract

The utility model relates to the technical field of bridge supports, in particular to a clamping tool for turning a bottom plate of a bridge support. A clamping tool for turning a bridge support bottom plate comprises a base which can be detachably installed on a chuck in a machine tool so that the base can rotate along with the chuck during turning. The supporting plates are vertically installed on the base, a cavity with the top open is defined by the base and the supporting plates, the inner side faces of the supporting plates can support a plurality of bottom plates to be machined, and the cavity allows a turning tool carried by a machine tool to stretch into the cavity and can make contact with and cut the arc faces of the bottom plates to be machined installed on the supporting plates. A plurality of bottom plates to be machined are allowed to be installed on different supporting plates at the same time for machining through the design. The vertically-installed supporting plate provides stable support for the bottom plate to be machined, vibration can be effectively reduced even in the high-speed rotating machining process, stability and safety in the machining process are guaranteed, and deviation or looseness of a workpiece is prevented.

Description

Technical Field

[0001] The utility model relates to the technical field of bridge supports, in particular to a clamping tool for turning and processing a bottom plate of a bridge support. Background Art

[0002] As an indispensable component of bridge construction, cylindrical steel bearings are precisely designed and highly functional, which is crucial to ensuring the overall stability and long-term safe operation of bridges. The upper swing and the bottom plate are the core components inside the bearing, and their structural design and manufacturing process are directly related to the performance of the bearing.

[0003] The base plate, as a key component that directly bears the weight of the bridge and transmits it to the foundation, has extremely high requirements for its structural characteristics. It must ensure a good fit with the piers or pad stones to effectively disperse the load, and it must have a certain degree of compliance to adapt to the slight displacement changes of the bridge caused by external factors. One side of the base plate is an arc surface, and the other side is a plane. In addition, the four corners of the base plate are mounting ear structures, and anchor holes are opened on the mounting ear structures for installation and positioning. The traditional processing technology uses a machining center or CNC milling machine with a ball-end milling cutter to process the arc surface of the base plate. Although this process can ensure the processing accuracy, it is time-consuming and the production efficiency is relatively low, which has become one of the bottlenecks restricting the improvement of the production efficiency of the bearing.

[0004] In order to break through this technical limitation, exploring the use of turning instead of milling has become an important research direction. Compared with milling, turning has higher processing efficiency and material removal rate when processing arc surface structures.

[0005] During the turning process, the workpiece is fixed on the chuck, which is connected to the spindle of the lathe through a flange. The spindle rotates to drive the chuck and the workpiece to rotate together, and the turning tool is installed on the tool holder, which can move horizontally (feed direction) or vertically (depth direction) according to the processing needs to cut the rotating workpiece.

[0006] However, the main challenge in implementing this transformation is how to stably and efficiently clamp the base plate to be processed, especially when turning arc surfaces. A tooling solution is needed to ensure processing accuracy and safety while meeting the needs of mass production. Utility Model Content

[0007] 1. Technical issues to be resolved

[0008] In view of the above-mentioned shortcomings and deficiencies of the prior art, the utility model provides a clamping tool for turning and machining of a bridge bearing bottom plate, which solves the technical problem of effectively clamping the bottom plate to be machined to achieve turning.

[0009] (II) Technical solution

[0010] In order to achieve the above-mentioned purpose, the main technical solutions adopted by the utility model include:

[0011] A clamping tool for turning a bridge bearing base plate, comprising a base that can be detachably mounted on a chuck in a machine tool so that the base rotates with the chuck during turning; a plurality of support plates vertically mounted on the base, the base and the support plates forming a cavity with an open top, the inner side surfaces of the support plates being able to support a plurality of base plates to be processed, the cavity allowing a turning tool carried by the machine tool to extend into the cavity and be able to contact and cut the arc surface of the base plate to be processed mounted on the support plates.

[0012] Preferably, the plurality of support plates are evenly arranged circumferentially along the outer periphery of the base, away from the chuck;

[0013] Each support plate includes a vertical plate and a horizontal plate, wherein the horizontal plate is closely attached to the surface of the base and is detachably connected to the base by bolts;

[0014] The vertical plate and the horizontal plate are arranged at right angles, and the inner side surface of the vertical plate can support multiple bottom plates to be processed and arrange the arc surfaces of all the bottom plates to be processed into a concentric circle;

[0015] The projections of the plurality of vertical plates on the base are square.

[0016] Preferably, a plurality of mounting holes are provided on the vertical plate, and the mounting holes are located at the four corners of the vertical plate;

[0017] The mounting holes can correspond to the anchor holes on the mounting ear structures of the bottom plate to be processed.

[0018] Preferably, the vertical plate is further provided with a plurality of positioning holes, which are opened parallel to the thickness direction of the vertical plate, are located at the four corners of the support plate, and are closer to the edge of the vertical plate relative to the mounting holes;

[0019] The positioning pin installed on the positioning hole can abut against the side wall of the mounting ear structure of the bottom plate to be processed.

[0020] Preferably, the positioning pin is placed in a positioning hole on one side of the support plate;

[0021] The positioning pins on the same horizontal plane are evenly distributed along the circumference, and each positioning pin abuts against an adjacent bottom plate to be processed.

[0022] Preferably, the base is circular in configuration, and a plurality of first connection holes are distributed on the edge of the base;

[0023] The first connecting hole and the second connecting hole on the horizontal plate are used in conjunction with positioning bolts to achieve connection between the clamping fixture and the chuck.

[0024] Preferably, a plurality of third connection holes are arranged on the edge of the base, and the third connection holes are arranged closer to the center of the circle than the first connection holes;

[0025] The transverse plate is provided with fourth connection holes corresponding to the third connection holes, and the fourth connection holes are evenly arranged along the length of the transverse plate;

[0026] The third connecting hole and the fourth connecting hole cooperate with each other through positioning bolts to realize the connection between the cross plate and the base.

[0027] Preferably, a first through hole can be set in the center of the vertical plate, and the size of the first hole is smaller than the size of the bottom plate to be processed.

[0028] Preferably, a second through hole can be provided in the center of the base.

[0029] Preferably, the number of the support plates is four, and four bottom plates to be processed can be accommodated and processed at one time;

[0030] The planes of all the bottom plates to be processed are in contact with the inner side surfaces of the support plates.

[0031] (III) Beneficial effects

[0032] The beneficial effect of the utility model is that the design allows multiple base plates to be processed to be installed on different support plates at the same time for processing. This design significantly increases the number of single processing operations and is suitable for application scenarios such as bridge bearings that require a large number of standardized production parts, greatly improving production efficiency and reducing costs.

[0033] The vertically mounted support plate provides a stable support for the base plate to be processed, which can effectively reduce vibration even during high-speed rotation processing, ensure the stability and safety of the processing, prevent the workpiece from shifting or loosening, and thus reduce the scrap rate.

[0034] The open cavity structure allows the turning tool to directly contact the curved surface of the base plate to be processed for processing without damaging the overall integrity of the machine tool and the base plate to be processed. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 This is a schematic diagram of the structure for installing the clamping fixture on the machine tool;

[0036] Figure 2 This is a schematic diagram of the overall structure of the clamping tooling of the utility model;

[0037] Figure 3 This is a schematic diagram of the installation position of the positioning pin;

[0038] Figure 4 is a schematic diagram of the base structure;

[0039] Figure 5 It is a schematic diagram of the bottom plate structure to be processed;

[0040] Figure 6 is a schematic diagram of the support plate structure;

[0041] [Description of Reference Numerals]

[0042] 1: machine tool; 2: chuck; 3: base; 4: support plate; 5: bottom plate to be processed; 6: turning tool; 7: mounting ear structure; 8: anchor hole; 9: mounting hole; 10: positioning hole; 11: positioning pin; 12: first connecting hole; 13: second connecting hole; 14: third connecting hole; 15: fourth connecting hole; 16: second through hole; 17: first through hole.

[0043] 41: vertical board; 42: horizontal board. DETAILED DESCRIPTION

[0044] In order to better explain the present invention and facilitate understanding, the present invention is described in detail below in conjunction with the accompanying drawings through specific implementation methods. Figure 1 The orientation is used as a reference.

[0045] Through the ingenious layout of the support plate 4, especially the design of the vertical plate 41, all arc surfaces of the base plate 5 to be processed are kept on the same center circle, ensuring high precision and consistency of the processed surface during turning, which helps to improve the overall performance and stability of the bridge bearing.

[0046] The arrangement of the positioning holes 10 and the positioning pins 11 and the staggered installation ensure that the bottom plate 5 to be processed is firmly fixed during the processing, prevents deviation or vibration, improves processing safety, and reduces the scrap rate.

[0047] The design of processing four base plates 5 at a time greatly improves the processing efficiency, reduces the clamping and adjustment time, is suitable for large-scale production needs, accelerates the manufacturing process of the bridge bearing, and reduces the production cost.

[0048] The design of the detachable base 3 and the support plate 4, as well as the use of the first, second, third and fourth connecting holes, facilitates quick clamping and adjustment of the tooling, enhances the versatility and adaptability of the equipment, facilitates use on different machine tools, and simplifies maintenance work.

[0049] The careful layout of the mounting holes 9 and the positioning holes 10, as well as the use of the positioning pins 11, form an efficient workpiece positioning system, simplify the workpiece loading process, ensure that each processing can be quickly and accurately positioned, and reduce preparation time.

[0050] In order to better understand the above technical solution, exemplary embodiments of the present invention will be described in more detail with reference to the accompanying drawings. Although exemplary embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to enable a clearer and more thorough understanding of the present invention and to fully convey the scope of the present invention to those skilled in the art.

[0051] Embodiment 1:

[0052] Reference Figure 1 and Figure 2 , including a base 3 that can be detachably mounted on a chuck 2 in a machine tool 1, so that the base 3 rotates with the chuck 2 during turning. A plurality of support plates 4 are vertically mounted on the base 3, the base 3 and the support plates 4 enclose a cavity with an open top, the inner side of the support plates 4 can support a plurality of bottom plates 5 to be processed, and the cavity allows a turning tool 6 carried by the machine tool 1 to extend into the cavity and contact and cut the arc surface of the bottom plate 5 to be processed mounted on the support plates 4.

[0053] By designing a support structure that can accommodate and process multiple bottom plates 5 at the same time, the output of a single process is significantly increased, greatly improving production efficiency. The layout of the support plate 4 ensures that the arc surfaces of all bottom plates 5 to be processed are on concentric circles. With the precise control of the machine tool, highly consistent processing accuracy can be achieved, ensuring the dimensional accuracy and surface quality of the bottom plate, which is conducive to improving the overall performance of the bridge bearing.

[0054] Reference Figure 2 and Figure 6 , multiple support plates 4 are evenly arranged along the outer periphery of the base 3, away from the chuck 2. Each support plate 4 includes a vertical plate 41 and a horizontal plate 42, the horizontal plate 42 is closely attached to the surface of the base 3, and is detachably connected to the base 3 by bolts. The vertical plate 41 and the horizontal plate 42 are arranged at right angles, and the inner side surface of the vertical plate 41 can support multiple bottom plates 5 to be processed and arrange the arc surfaces of all the bottom plates 5 to be processed into a concentric circle; the projection of the multiple vertical plates 41 on the base 3 is a square.

[0055] By designing that multiple support plates 4 are evenly distributed along the periphery of the base 3, multiple base plates 5 can be fixed and processed at the same time, which significantly increases the number of single processing, greatly enhances production efficiency and mass production capacity, and reduces the processing cost of a single part and the total production cycle.

[0056] The supporting structure formed by the vertical plate 41 and the horizontal plate 42 ensures that all arc surfaces of the bottom plate 5 to be processed are in the same horizontal plane and the same center position. This precise alignment helps to achieve high-precision processing during the turning process and ensures the consistency and interchangeability of all processed surfaces. This is very important for components such as bridge bearings that require high precision, because the workpiece to be processed only needs to be cut to a thickness of 4-5mm after forging, so higher precision requirements are required.

[0057] The right-angle configuration of the vertical plate 41 and the horizontal plate 42 and the design of the horizontal plate close to the surface of the base 3 enhance the rigidity and stability of the entire tooling system, and can effectively reduce vibration even during high-speed turning, ensure processing safety, and reduce the risk of workpiece deviation or damage.

[0058] The square projection layout of the vertical plate 41 on the base 3 not only maximizes the space utilization, but also ensures that the arc surface of the workpiece to be processed is in the same horizontal plane and the same center position, thereby improving work efficiency and reducing clamping errors.

[0059] Reference Figure 5 and Figure 6 A plurality of mounting holes 9 are provided on the vertical plate 41, and the mounting holes 9 are located at the four corners of the vertical plate 41. The mounting holes 9 can correspond to the anchor holes 8 on the mounting ear structure 7 of the bottom plate 5 to be processed.

[0060] By accurately corresponding the mounting holes 9 with the anchor holes 8 on the base plate 5 , the workpiece to be processed can be quickly and accurately fixed at a predetermined position, thereby reducing the positioning time and improving the efficiency of the preparation work before processing.

[0061] The bottom plate 5 is fixed to the vertical plate 41 by bolts through the mounting holes 9, which can ensure that the workpiece is stable and immobile during processing, reduce vibration and displacement, thereby improving processing accuracy, ensuring the processing quality and surface finish of the workpiece, and does not damage the overall integrity of the bottom plate 5.

[0062] Reference Figure 6 The vertical plate 41 is also provided with a plurality of positioning holes 10, which are located at the four corners of the vertical plate 41, and are closer to the edge of the vertical plate 41 than the mounting holes 9. The positioning pins 11 installed on the positioning holes 10 can abut against the side wall of the mounting ear structure 7 of the bottom plate 5 to be processed. The positioning holes are opened parallel to the thickness direction of the vertical plate, and the direction of the positioning holes is the same as the direction of the mounting holes 9.

[0063] Reference Figure 3 and Figure 6 The positioning pins 11 are placed in the positioning holes 10 on one side of the support plate 4. The positioning pins 11 on the same horizontal plane are evenly distributed along the circumference, and each positioning pin 11 abuts against the adjacent bottom plate 5 to be processed.

[0064] The use of the positioning hole 10 and the positioning pin 11 not only limits the lateral position of the base plate 5, but also ensures precise axial alignment through the side wall abutment, improves the overall positioning accuracy, and ensures the consistency and interchangeability of the processing dimensions.

[0065] The tight contact between the positioning pin 11 and the side wall of the bottom plate mounting ear structure effectively limits the shaking of the workpiece during the processing, enhances the processing stability, reduces the surface defects caused by vibration, and improves the processing quality of the product.

[0066] The positioning pins 11 are staggered in the positioning holes 10 on one side of the support plate 4, and such a design prevents interference between the positioning pins 11. This ensures that the turning tool can effectively contact and process the arc surface of each bottom plate, avoids interference, and improves processing efficiency.

[0067] See also Figure 3 , because each support plate 4 has the same structure and the position of the positioning holes 10 is the same. If the positioning pins 11 are installed on two adjacent support plates 4, interference will occur between the positioning pins 11, so one side of each bottom plate 5 to be processed is installed to abut against the positioning pin 11. Of course, the height of the positioning holes 10 on each support plate 4 can be slightly adjusted to make the height of the positioning holes 10 on adjacent support plates 4 different, and the difference is larger than the radial size of the positioning pin 11, and at the same time, the difference is smaller than the vertical height of the mounting ear structure 7 of the bottom plate 5 to be processed, because the positioning pin 11 needs to abut against the mounting ear structure 7 for horizontal positioning, and only after horizontal positioning can it be convenient to fix the bottom plate 5 to the vertical plate 41 through the mounting hole 9 with bolts.

[0068] Reference Figure 4 The base 3 is a circular configuration, and a plurality of first connection holes 12 are distributed on the edge of the base 3. The first connection holes 12 and the second connection holes 13 on the horizontal plate 42 are used in conjunction with positioning bolts to achieve the connection between the clamping tool and the chuck 2.

[0069] By precisely docking the first connection hole 12 and the second connection hole 13 and fastening with positioning bolts, a firm and stable connection between the clamping fixture and the machine tool chuck 2 is ensured, vibration during processing is reduced, and overall processing stability is improved. Of course, the connection with the machine tool chuck 2 is actually a common chuck flange connection installed on the machine tool chuck 2, so that the connection with the chuck flange is completed without destroying the chuck structure.

[0070] Reference Figure 2 and Figure 4, multiple third connection holes 14 are arranged at the edge of the base 3, and the third connection holes 14 are arranged closer to the center of the circle than the first connection holes 12. The transverse plate 42 is provided with fourth connection holes 15 corresponding to the third connection holes 14, and the fourth connection holes 15 are evenly arranged along the length of the transverse plate 42. The third connection holes 14 and the fourth connection holes 15 work together through positioning bolts to achieve the connection between the transverse plate 42 and the base 3.

[0071] The alignment connection between the third connecting hole 14 and the fourth connecting hole 15 reinforces the assembly of the cross plate 42 and the base 3 through positioning bolts, thereby improving the stability of the entire tooling structure, especially under high-speed conditions of turning processing, which can effectively reduce vibration and ensure processing accuracy.

[0072] The third connection hole 14 is arranged closer to the center of the circle than the first connection hole 12, which optimizes the stress state of the connection part between the cross plate and the base, disperses the cutting force generated by workpiece processing, prevents local stress concentration, and increases the durability of the tooling.

[0073] The design of evenly arranging the fourth connecting holes 15 along the length of the transverse plate 42 ensures the accurate centering of the transverse plate on the base, further improving the positioning accuracy of the overall tooling, which is related to ensuring the concentricity and dimensional consistency of the base plate processing.

[0074] Reference Figure 2 A first through hole 17 can be set at the center of the vertical plate 41, and the size of the first hole 17 is smaller than the size of the bottom plate 5 to be processed.

[0075] Reference Figure 4 A second through hole 16 can be provided at the center of the base 3 .

[0076] The first through hole 17 and the second through hole 16 play a role in reducing weight.

[0077] Reference Figure 1 and Figure 2 The number of the support plates 4 is four, and four to-be-processed bottom plates 5 can be accommodated and processed at one time. The planes of all to-be-processed bottom plates 5 are in contact with the inner side surfaces of the support plates 4.

[0078] The ability to process four base plates at one time significantly increases the output of parts per unit time, reduces the clamping and adjustment time of a single workpiece, and greatly enhances production efficiency. It is especially suitable for scenarios that require mass production of bridge bearing base plates.

[0079] All the base plates to be processed are positioned on the support plate 4 at the same time, ensuring that their relative positions remain fixed during the turning process, which helps to maintain the consistency of the size and shape of each workpiece after processing.

[0080] In the description of the present utility model, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0081] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, 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 the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0082] In the present utility model, unless otherwise clearly specified and limited, when a first feature is “on” or “below” a second feature, it may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, when a first feature is “above”, “above” or “above” a second feature, it may be that the first feature is directly above or obliquely above the second feature, or it may simply mean that the first feature is higher in level than the second feature. When a first feature is “below”, “below” or “below” a second feature, it may be that the first feature is directly below or obliquely below the second feature, or it may simply mean that the first feature is lower in level than the second feature.

[0083] In the description of this specification, the description of the terms "one embodiment", "some embodiments", "embodiment", "example", "specific example" or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, unless they are contradictory.

[0084] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations of the present invention. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A clamping tool for turning and processing the bottom plate of a bridge support, characterized in that: include: A base (3) that can be detachably mounted on a chuck (2) in a machine tool (1) so that the base (3) rotates with the chuck (2) during turning processing; A plurality of support plates (4) are vertically mounted on the base (3); the base (3) and the support plates (4) enclose a cavity with an open top; the inner side surfaces of the plurality of support plates (4) are capable of supporting a plurality of bottom plates (5) to be processed; the cavity allows a turning tool (6) carried by the machine tool (1) to extend into the cavity and to contact and cut the arc surface of the bottom plate (5) to be processed mounted on the support plates (4).

2. The bridge bearing bottom plate turning clamping tool as claimed in claim 1 is characterized in that: The plurality of support plates (4) are evenly arranged in a circumferential direction along the outer periphery of the base (3) and away from the chuck (2); Each of the support plates (4) comprises a vertical plate (41) and a horizontal plate (42), wherein the horizontal plate (42) is closely attached to the surface of the base (3) and is detachably connected to the base (3) by bolts; The vertical plate (41) and the horizontal plate (42) are arranged vertically, and the inner side surfaces of the vertical plates (41) of the plurality of support plates (4) are capable of supporting a plurality of bottom plates (5) to be processed and arranging the arc surfaces of all the bottom plates (5) to be processed into a concentric circle; The projections of the upright plates (41) of all the support plates (4) on the base (3) are square.

3. The bridge bearing bottom plate turning clamping tool as claimed in claim 2 is characterized in that: The vertical plate (41) is provided with a plurality of mounting holes (9), and the mounting holes (9) are located at the four corners of the vertical plate (41); The mounting hole (9) can correspond to the anchor hole (8) on the mounting ear structure (7) of the base plate (5) to be processed.

4. The bridge bearing bottom plate turning clamping tool as claimed in claim 3 is characterized in that: The vertical plate (41) is also provided with a plurality of positioning holes (10) opened in parallel with the thickness direction of the vertical plate (41), the positioning holes (10) are located at the four corners of the vertical plate (41), and the positioning holes (10) are close to the edge of the vertical plate (41) relative to the mounting holes (9); The positioning pin (11) installed on the positioning hole (10) can abut against the side wall of the mounting ear structure (7) of the bottom plate (5) to be processed.

5. The bridge bearing bottom plate turning clamping tool as claimed in claim 4 is characterized in that: The positioning pin (11) is placed in the positioning hole (10) on one side of the support plate (4); The positioning pins (11) on the same horizontal plane are evenly distributed along the circumference, and each positioning pin (11) abuts against an adjacent bottom plate (5) to be processed.

6. The bridge bearing bottom plate turning clamping tool as claimed in claim 2, characterized in that: The base (3) is of circular configuration, and a plurality of first connection holes (12) are distributed on the edge of the base (3); The first connection hole (12) and the second connection hole (13) on the transverse plate (42) are used in conjunction with positioning bolts to achieve connection between the clamping fixture and the chuck (2).

7. The bridge bearing bottom plate turning clamping tool as claimed in claim 6, characterized in that: A plurality of third connection holes (14) are arranged on the edge of the base (3); the third connection holes (14) are arranged closer to the center of a circle than the first connection holes (12); The transverse plate (42) is provided with fourth connection holes (15) corresponding to the third connection holes (14), and the fourth connection holes (15) are evenly arranged along the length of the transverse plate (42); The third connection hole (14) and the fourth connection hole (15) cooperate with each other through positioning bolts to achieve the connection between the transverse plate (42) and the base (3).

8. The bridge bearing bottom plate turning clamping tool as claimed in claim 2, characterized in that: A first through hole (17) can be provided at the center of the vertical plate (41), and the size of the first through hole (17) is smaller than the size of the bottom plate (5) to be processed.

9. The bridge bearing bottom plate turning clamping tool as claimed in claim 1, characterized in that: A second through hole (16) can be provided at the center of the base (3).

10. The bridge bearing bottom plate turning clamping tool as claimed in claim 1, characterized in that: The number of the support plates (4) is four, and they can accommodate and process four bottom plates (5) to be processed at one time; The planes of all the bottom plates (5) to be processed are in contact with the inner side surfaces of the support plates (4).

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