Multifunctional clamping device

Abstract

The utility model discloses a multifunctional clamping device which comprises a base, a supporting plate and a clamping mechanism, the base is fixedly installed on a machine tool, the supporting plate is detachably installed on the base, the clamping mechanism is installed on the supporting plate, hollowed-out receding holes with the same size are formed in the center of the supporting plate and the center of the base, and the clamping mechanism is installed on the supporting plate. The clamping mechanism comprises a fixed cross beam and a movable cross beam, the fixed cross beam is fixedly installed on the supporting plate, the movable cross beam is movably arranged on the supporting plate, the fixed cross beam and the movable cross beam are oppositely arranged, the movable cross beam is located above the hollowed-out receding hole, and clamping assemblies used for fixing workpieces are detachably installed on the movable cross beam and the fixed cross beam. The workpiece and the clamping assembly are fixedly connected firstly, then the clamping assembly and the workpiece are installed on the fixed cross beam and the movable cross beam together, one side of the workpiece is installed on the fixed cross beam through the clamping assembly, the other side of the workpiece is fixedly connected after the position of the movable cross beam is adjusted according to different types of workpieces, and different clamping requirements can be met; and the die can be replaced quickly.

Description

Technical Field

[0001] The utility model belongs to the technical field of workpiece clamps, in particular to a multifunctional clamping device. Background Art

[0002] In mechanical processing, before processing the workpiece, it is necessary to clamp the workpiece with a specific fixture to achieve the purpose of positioning and fixing. In order to achieve rapid die change of the processing machine, multiple co-seat clamping devices need to be switched to ensure stability during the processing and improve the utilization rate of the machine tool. In the wire cutting process of the workpiece, the existing fixture is to press the workpiece directly on the workbench of the machine tool with a pressure plate, and then fix it to the workbench with bolts, so that the workpiece is suspended in the air for easy processing. However, this existing fixture needs to be stopped and readjusted when the workpiece to be processed is replaced, which affects the processing efficiency. In addition, the clamping tool cannot match many different types of workpieces, and the operator needs to frequently find and replace different fixtures corresponding to the workpiece. The machine tool cannot complete the preparatory work in advance. The difficulty of automated die change is high and the processing efficiency is low. Utility Model Content

[0003] (1) Technical problems to be solved

[0004] In view of the shortcomings of the existing technology, the purpose of the present invention is to provide a multifunctional clamping device, which aims to solve the technical problem that it is difficult to unify the clamps for different types of workpieces under the existing technology.

[0005] (2) Technical solution

[0006] The utility model provides a multifunctional clamping device, including a base, a support plate and a clamping mechanism, the base is fixedly mounted on a machine tool, the support plate is detachably mounted on the base, the clamping mechanism is mounted on the support plate, and hollow avoidance holes of the same size are provided at the centers of the support plate and the base, the clamping mechanism includes a fixed beam fixedly mounted on the support plate and a movable beam movably arranged on the support plate, the fixed beam and the movable beam are arranged opposite to each other, the movable beam is located above the hollow avoidance hole, and clamping components for fixing the workpiece are detachably mounted on the movable beam and the fixed beam.

[0007] Preferably, the clamping assembly includes a regular clamping block and an extended clamping block with a length greater than the regular clamping block, the regular clamping block is provided with a first mounting hole at one end, and a first workpiece mounting screw hole is provided at the other end, the first mounting hole is provided with a first fixing bolt for connecting a fixed crossbeam, the first workpiece mounting screw hole is provided with a first connecting bolt for connecting the workpiece, and the first connecting bolt protrudes from the surface of the regular clamping block, one end of the extended clamping block is provided with two second mounting holes in parallel along the length direction of the extended clamping block, and the other end is provided with a second workpiece mounting screw hole, the second mounting hole is provided with a second fixing bolt for connecting a movable mounting crossbeam, the second workpiece mounting screw hole is provided with a second connecting bolt for connecting the workpiece, and the second connecting bolt protrudes from the surface of the extended clamping block.

[0008] Preferably, the normal length clamping block is installed above the fixed beam, and the installation direction of the first fixing bolt is opposite to that of the first connecting bolt. The extended clamping block is installed above the movable beam, and the installation direction of the second connecting bolt is opposite to that of the second fixing bolt, and the installation direction of the second connecting bolt is the same as that of the first connecting bolt.

[0009] Preferably, mounting steps are provided in the first mounting hole and the second mounting hole, and the distance between the upper surface of the standard clamping block / extended clamping block and the upper surface of the mounting steps is greater than or equal to the height of the bolt head of the first fixing bolt / second fixing bolt.

[0010] Preferably, a plurality of first positioning screw holes are arranged in an array on the fixed beam, and the first fixing bolt is connected to any one or more first positioning screw holes; a plurality of second positioning screw holes are arranged in an array on the movable beam, and the second fixing bolt is connected to any one or more second positioning screw holes.

[0011] Preferably, two guide rails parallel to each other are provided on both sides of the hollow avoidance hole on the support plate, a guide sliding block is slidably mounted on the guide rails, a connecting plate is provided on the guide sliding block, a sliding mounting screw hole for installing a movable crossbeam is provided on the side of the connecting plate close to the hollow avoidance hole, and movable mounting holes are provided at both ends of the movable crossbeam.

[0012] Preferably, the support plate is provided with a plurality of first columns for placing the movable beam, a second column for placing the ordinary length clamping block and a third column for placing the extended clamping block, the first column and the second column are both arranged at the same end of the guide rail, and the third column is arranged at the other end of the guide rail, the number of the first columns is two, and the spacing between the two first columns is equal to the spacing between the two movable mounting holes at both ends of the movable beam, the second columns are grouped into two and multiple groups are provided on the support plate, the spacing between the two second columns in each group is less than or equal to the mounting hole diameter of the first mounting hole, the third columns are grouped into two and multiple groups are provided on the support plate, the spacing between the two third columns in each group is less than or equal to the mounting hole diameter of the second mounting hole.

[0013] Preferably, a positioning plate is provided on the side of the hollow avoidance hole of the support plate away from the fixed beam, one end of the positioning plate is horizontally extended toward the direction close to the fixed beam and is provided with a fixed clamping block, and the other end is movably provided with a movable clamping block, and the mounting surfaces of the movable clamping block and the side surface of the positioning plate are provided with serrations that are meshed with each other, and the movable clamping block is provided with a connector that can be detachably connected to the positioning plate.

[0014] Preferably, the upper surface of the base is provided with a plurality of positioning and locking mechanisms in a centrally symmetrical manner, and the bottom of the support plate is provided with a rivet used in conjunction with the positioning and locking mechanism, and the rivet and the positioning and locking mechanism are detachably connected.

[0015] Preferably, two handles are symmetrically provided on both sides of the support plate.

[0016] (3) Beneficial effects

[0017] Compared with the prior art, the beneficial effects of the present invention are:

[0018] When using the clamping device of the present invention to clamp a workpiece, the workpiece and the clamping assembly are first fixedly connected, and then the clamping assembly and the workpiece are respectively installed on the fixed crossbeam and the movable crossbeam. After the pallet for clamping the workpiece is completed and the previous workpiece on the base is processed and removed, it is installed as a whole on the base for processing operations. The clamping assembly installs one side of the workpiece on the fixed crossbeam and adjusts the position of the movable crossbeam on the other side according to the different types of workpieces and then fixes the connection. The workpiece is located above the hollow avoidance hole, and the machine tool will not be blocked when processing the workpiece. When different workpieces have different sizes and shapes, the clamping device of the present invention can meet different clamping requirements, and the pallet and the base can be installed detachably, so that different workpieces can be clamped outside the machine in advance and then the mold can be quickly changed, thereby improving the work efficiency of processing and clamping and reducing the difficulty of automated mold changing. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a three-dimensional structural diagram of the utility model.

[0020] Figure 2 It is a partial structural exploded view of the utility model.

[0021] Figure 3 It is a bottom view of the utility model in the assembled workpiece state.

[0022] Figure 4 It is a three-dimensional structural diagram of the clamping assembly in the utility model.

[0023] The markings of the components in the accompanying drawings are as follows:

[0024] 1. Base; 11. Positioning and locking mechanism; 2. Support plate; 21. Hollow avoidance hole; 22. Guide rail; 221. Guide slide; 222. Connecting plate; 2221. Sliding mounting screw hole; 23. First column; 24. Second column; 25. Third column; 26. Positioning plate; 261. Fixed clamp; 262. Movable clamp; 263. Saw teeth; 264. Connector; 28. Handle; 3. Fixed beam; 31. First adjustment screw hole ; 4. Movable crossbeam; 41. Second adjustment screw hole; 42. Movable mounting hole; 5. Clamping assembly; 51. Ordinary length clamping block; 511. First mounting hole; 512. First fixing bolt; 513. First workpiece mounting screw hole; 514. First connecting bolt; 52. Extended clamping block; 521. Second mounting hole; 522. Second fixing bolt; 523. Second workpiece mounting screw hole; 524. Second connecting bolt; 53. Mounting step. DETAILED DESCRIPTION

[0025] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. For the sake of clarity, many practical details will be described in the following description. However, it should be understood that these practical details should not be used to limit the present application. In other words, in some embodiments of the present application, these practical details are not essential. In addition, to simplify the drawings, some conventional structures and components will be depicted in a simple schematic manner in the drawings.

[0026] It should be noted that all directional indications such as up, down, left, right, front, back, etc. in the embodiments of the present application are only used to explain the relative position relationship, movement status, etc. between the various components in a certain specific posture as shown in the accompanying drawings. If the specific posture changes, the directional indication will also change accordingly.

[0027] In addition, in this application, descriptions such as "first" and "second" are only used for descriptive purposes and do not specifically refer to the order or ranking, nor are they used to limit this application. They are only used to distinguish components or operations described with the same technical terms, and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in this field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0028] In order to further understand the content, features and effects of the present invention, the following embodiments are given as examples and described in detail with reference to the accompanying drawings.

[0029] See also Figure 1-4 The utility model discloses a multifunctional clamping device, including a base 1, a support plate 2 and a clamping mechanism, characterized in that the base 1 is fixedly mounted on an external machine tool (not shown in the figure), the support plate 2 is detachably mounted on the base 1, the clamping mechanism is mounted on the support plate 2, and a hollow avoidance hole 21 of the same size is provided at the center of the support plate 2 and the base 1, the clamping mechanism includes a fixed beam 3 fixedly mounted on the support plate 2 and a movable beam 4 movably arranged on the support plate 2, the fixed beam 3 and the movable beam 4 are arranged opposite to each other, the movable beam 4 is located above the hollow avoidance hole 21, and a clamping component 5 for fixing a workpiece is detachably mounted on the movable beam 4 and the fixed beam 3.

[0030] When using the clamping device of the present invention to clamp the workpiece, the workpiece and the clamping assembly 5 are first fixedly connected, and then the clamping assembly 5 is installed together with the workpiece on the fixed crossbeam 3 and the movable crossbeam 4 respectively. The support plate 2 with the workpiece clamped is installed on the base 1 as a whole for processing after the previous workpiece on the base 1 is processed and removed. The clamping assembly 5 installs one side of the workpiece on the fixed crossbeam 3, and adjusts the position of the movable crossbeam 4 on the other side according to the different types of workpieces and then fixes the connection. The workpiece is located above the hollow avoidance hole 21, and the machine tool will not be blocked when processing the workpiece. When different workpieces have different sizes and shapes, the clamping device of the present invention can meet different clamping requirements, and the support plate 2 and the base 1 can be installed detachably, and different workpieces can be clamped outside the machine in advance and then the mold can be quickly changed, thereby improving the working efficiency of processing and clamping and reducing the difficulty of automated mold changing.

[0031] In the embodiment of the present utility model, the clamping assembly 5 includes a normal long clamping block 51 and an extended clamping block 52 whose length is greater than the normal long clamping block 51, and the normal long clamping block 51 is provided with a first mounting hole 511 at one end, and a first workpiece mounting screw hole 513 at the other end, the first mounting hole 511 is provided with a first fixing bolt 512 for connecting to the fixed crossbeam 3, the first workpiece mounting screw hole 513 is penetrated with a first connecting bolt 514 for connecting the workpiece, and the first connecting bolt 514 protrudes from the surface of the normal long clamping block 51, and one end of the extended clamping block 52 is provided with two second mounting holes 521 in parallel along the length direction of the extended clamping block 52, and the other end is provided with a second workpiece mounting screw hole 523, the second mounting hole 521 is provided with a second fixing bolt 522 for connecting to the movable crossbeam 4, and the second workpiece mounting screw hole 523 is penetrated with a second connecting bolt 524 for connecting the workpiece Bolt 524, the second connecting bolt 524 protrudes from the surface of the extended clamping block 52. By setting the ordinary clamping block 51 on the fixed beam 3, some light-weight and small-sized workpieces can be directly fixed to the ordinary clamping block 51 by the first connecting bolt 514, simplifying the adjustment operation. By setting the extended clamping block 52 on the movable beam 4, the relative position of the second fixing bolt 522 in the second mounting hole 521 can be adaptively adjusted according to the size and weight of the workpiece. The second fixing bolt 522 locks the extended clamping block 52 on the movable beam 4 to adjust the length of the extended clamping block 52 exceeding the movable beam 4 and extending toward the fixed beam 3 (the length of the extended clamping block 52 supporting the workpiece), thereby adjusting the overlapping length of the extended clamping block 52 and the workpiece and the position of the connection between the second connecting bolt 524 and the workpiece. The fixing position and angle of the workpiece can be flexibly adjusted to adapt to the clamping and fixation of various types of workpieces.

[0032] In the embodiment of the present invention, the ordinary long clamping block 51 is installed above the fixed beam 3, the installation direction of the first fixing bolt 512 is opposite to that of the first connecting bolt 514, the extended clamping block 52 is installed above the movable beam 4, the installation direction of the second connecting bolt 524 is opposite to that of the second fixing bolt 522, and the installation direction of the second connecting bolt 524 is the same as that of the first connecting bolt 514. The first fixing bolt 512 and the second fixing bolt 522 are both installed downward, and the first connecting bolt 514 and the second connecting bolt 524 are both installed upward, so that the first connecting bolt 514 passes through the first workpiece mounting screw hole 513 and protrudes upward to connect the bottom of one side of the workpiece. The second connecting bolt 524 passes through the second workpiece mounting screw hole 523 and protrudes upward to connect to the bottom of the other side of the workpiece. In this embodiment, the workpiece is fixedly supported above the clamping assembly 5 by the first connecting bolt 514 and the second connecting bolt 524. However, in some other embodiments, the first connecting bolt 514 and the second connecting bolt 524 can also be installed downward to suspend the workpiece below the clamping assembly 5, and the ordinary length clamping block 51 and the extended clamping block 52 can also be fixedly installed below the fixed beam 3 and the movable beam 4 respectively. The specific implementation method is what a technician in this field can associate with the relevant structural settings in this embodiment, and will not be described in detail here.

[0033] In order to avoid the bolt heads of the first fixing bolt 512 and the second fixing bolt 522 protruding from the normal clamping block 51 and the length being greater than the upper surface of the normal clamping block 51, which will interfere with the upward connection of the first connecting bolt 514 and the second connecting bolt 524 to the workpiece, the bolt heads of the first fixing bolt 512 and the second fixing bolt 522 in the implementation of the utility model are respectively installed in a submerged manner in the first mounting hole 511 and the second mounting hole 521. Specifically, the first mounting hole 511 and the second mounting hole 521 are both provided with mounting steps 53, and the distance between the upper surface of the normal clamping block 51 / extended clamping block 52 and the upper surface of the mounting step 53 is greater than or equal to the height of the bolt head of the first fixing bolt 512 / the second fixing bolt 522, so that the submerged installation of the bolt heads of the first fixing bolt 512 and the second fixing bolt 522 can be achieved.

[0034] In the embodiment of the utility model, a plurality of first positioning adjustment screw holes 31 are provided in an array on the fixed beam 3, and the first fixing bolt 512 is connected to any one or more first positioning adjustment screw holes 31. A plurality of second positioning adjustment screw holes 41 are provided in an array on the movable beam 4, and the second fixing bolt 522 is connected to any one or more second positioning adjustment screw holes 41, thereby increasing the flexibility of adjusting the fixed position of the workpiece.

[0035] The movable crossbeam 4 is then moved in a direction closer to or farther from the fixed crossbeam 3 by sliding the movable crossbeam 4 in a direction parallel to or away from the fixed crossbeam 3. Specifically, two guide rails 22 are provided on each side of the hollow avoidance hole 21 of the support plate 2, and a guide slider 221 is slidably mounted on the guide rail 22. The guide slider 221 is provided with a connecting plate 222, and the connecting plate 222 is provided with a sliding mounting screw hole 2221 for mounting the movable crossbeam 4 at one end near the hollow avoidance hole 21.

[0036] When the movable crossbeam 4, the ordinary length clamping block 51 and the extended clamping block 52 need to be placed in a unified position after disassembly, so that they can be quickly found when used next time, in the embodiment of the utility model, a placement mechanism for placing the movable crossbeam 4, the ordinary length clamping block 51 and the extended clamping block 52 is set on both sides of the support plate 2. Specifically, the support plate 2 is provided with a plurality of first columns 23 for placing the movable crossbeam 4, a second column 24 for placing the ordinary length clamping block 51 and a third column 25 for placing the extended clamping block 52, the first column 23 and the second column 24 are both arranged at the same end of the guide rail 22, and the third column 25 is arranged at the other end of the guide rail 22, the number of the first columns 23 is two, and the spacing between the two first columns 23 is equal to the spacing between the two movable mounting holes 42 at both ends of the movable crossbeam 4, and the second columns 24 are a group of two. There are multiple groups of two on the support plate 2, and each group The spacing between the two second columns 24 is less than or equal to the mounting hole diameter of the first mounting hole 511, and the third columns 25 are grouped into two and multiple groups are provided on the support plate 2, and the spacing between the two third columns 25 in each group is less than or equal to the mounting hole diameter of the second mounting hole 521. When the movable crossbeam 4 is disassembled and not in use, it can be fixed on the first column 23 through the movable mounting holes 42 at both ends to achieve placement, and there can be multiple spare standard length clamping blocks 51 and extended clamping blocks 52 to facilitate the increase or decrease of the number of standard length clamping blocks 51 and extended clamping blocks 52 to meet the use of workpieces of different sizes. Unused accessories are respectively inserted into the second column 24 and the third column 25. By placing the detachable and selectively used accessories on the support plate 2 and arranging them in partitions, it is convenient to quickly find the corresponding accessories for installation and use, and it also avoids the need to set up a special area for storing accessories to occupy workshop space.

[0037] In order to further increase the flexibility and selectivity of workpiece clamping, a side clamping mechanism is further provided on the other side of the fixed beam 3 above the hollow avoidance hole 21 in the embodiment of the present invention. Specifically, a positioning plate 26 is provided on the side of the hollow avoidance hole 21 of the support plate 2 away from the fixed beam 3. One end of the positioning plate 26 is horizontally extended toward the direction close to the fixed beam 3 and is provided with a fixed clamping block 261, and the other end is movably provided with a movable clamping block 262. The mounting surfaces of the movable clamping block 262 and the side surface of the positioning plate 26 are provided with saw teeth 263 that are meshed with each other, and the movable clamping block 262 is provided with a connecting piece 26 that is detachably connected to the positioning plate 26. 4. When clamping a workpiece with a regular shape, first place one side of the workpiece against the angle between the fixed clamping block 261 and the positioning plate 26, move the movable clamping block 262 to a position that is close to the shape of the other side of the workpiece, and then fix the position of the movable clamping block 262 through the connecting piece 264 to achieve the state of fixing the workpiece. By setting the serrations 263 between the movable clamping block 262 and the positioning plate 26, the movable clamping block 262 is engaged with the positioning plate 26 to fix the relative position when the movable clamping block 262 determines the position to be fixed, which facilitates the fixing operation of the connecting piece 264 and prevents the movable clamping block 262 from sliding relative to the positioning plate 26 to affect the clamping stability of the workpiece.

[0038] It should be noted that there are many implementation methods for the detachable connection between the connecting member 264 and the positioning plate 26 and between the connecting member 264 and the movable clamp 262, such as screw and screw hole connection, snap connection, magnetic attraction, etc. These detachable connection methods are easy for technical personnel in this field to think of and will not be elaborated here.

[0039] In this embodiment of the utility model, the upper surface of the base 1 is provided with a plurality of centrally symmetrical positioning and locking mechanisms 11. The bottom of the support plate 2 is provided with a pull pin (not shown in the figure) for use with the positioning and locking mechanisms 11. The pull pin and the positioning and locking mechanisms 11 are detachably connected. When the loading of the support plate 2 on the base 1 is switched, the positioning and locking mechanisms 11 guide the pull pins and automatically align the support plate 2 and the base 1, thereby achieving high alignment accuracy and realizing fast positioning and precise connection. Specifically, the positioning and locking mechanisms 11 can adopt existing positioning and locking devices, which will not be described in detail here.

[0040] In the embodiment of the present invention, two handles 28 are symmetrically provided on both sides of the pallet 2. When the pallet 2 needs to be moved, the manipulator can lift the pallet 2 for transportation by clamping the handles 28, which is beneficial to improving the degree of automation of the pallet 2 transportation.

[0041] The above description is only a preferred embodiment of the present application and does not constitute any form of limitation to the present application. Any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present application fall within the scope of the technical solution of the present application.

Claims

1. A multifunctional clamping device, comprising a base (1), a support plate (2) and a clamping mechanism, characterized in that: The base (1) is fixedly mounted on a machine tool, the support plate (2) is detachably mounted on the base (1), the clamping mechanism is mounted on the support plate (2), a hollow avoidance hole (21) of the same size is provided at the center of the support plate (2) and the base (1), the clamping mechanism comprises a fixed beam (3) fixedly mounted on the support plate (2) and a movable beam (4) movably arranged on the support plate (2), the fixed beam (3) and the movable beam (4) are arranged opposite to each other, the movable beam (4) is located above the hollow avoidance hole (21), and a clamping assembly (5) for fixing a workpiece is detachably mounted on the movable beam (4) and the fixed beam (3).

2. A multifunctional clamping device according to claim 1, characterized in that: The clamping assembly (5) comprises a normal-length clamping block (51) and an extended clamping block (52) whose length is greater than that of the normal-length clamping block (51); a first mounting hole (511) is provided at one end of the normal-length clamping block (51), and a first workpiece mounting screw hole (513) is provided at the other end; a first fixing bolt (512) for connecting and fixing the crossbeam (3) is provided in the first mounting hole (511); a first connecting bolt (514) for connecting the workpiece is passed through the first workpiece mounting screw hole (513); the first connecting bolt (514) protrudes On the surface of the ordinary length clamping block (51), one end of the extended clamping block (52) is provided with two second mounting holes (521) in parallel along the length direction of the extended clamping block (52), and the other end is provided with a second workpiece mounting screw hole (523), a second fixing bolt (522) for connecting the movable mounting beam is installed in the second mounting hole (521), and a second connecting bolt (524) for connecting the workpiece is passed through the second workpiece mounting screw hole (523), and the second connecting bolt (524) protrudes from the surface of the extended clamping block (52).

3. A multifunctional clamping device according to claim 2, characterized in that: The ordinary length clamping block (51) is installed above the fixed crossbeam (3), and the installation directions of the first fixing bolt (512) and the first connecting bolt (514) are opposite. The extended clamping block (52) is installed above the movable crossbeam (4), and the installation directions of the second connecting bolt (524) and the second fixing bolt (522) are opposite. The installation directions of the second connecting bolt (524) and the first connecting bolt (514) are the same.

4. A multifunctional clamping device according to claim 2, characterized in that: The first mounting hole (511) and the second mounting hole (521) are both provided with mounting steps (53), and the distance between the upper surface of the normal length clamping block (51) / the extended length clamping block (52) and the upper surface of the mounting steps (53) is greater than or equal to the height of the bolt head of the first fixing bolt (512) / the second fixing bolt (522).

5. The multifunctional clamping device according to claim 3, characterized in that: The fixed crossbeam (3) is provided with a plurality of first positioning screw holes (31) in an array, and the first fixing bolt (512) is connected to any one or more first positioning screw holes (31); the movable crossbeam (4) is provided with a plurality of second positioning screw holes (41) in an array, and the second fixing bolt (522) is connected to any one or more second positioning screw holes (41).

6. The multifunctional clamping device according to claim 1, characterized in that: Two guide rails (22) parallel to each other are provided on both sides of the hollow avoidance hole (21) on the support plate (2), a guide slider (221) is slidably mounted on the guide rail (22), a connecting plate (222) is provided on the guide slider (221), a sliding mounting screw hole (2221) for mounting a movable crossbeam (4) is provided on one side of the connecting plate (222) close to the hollow avoidance hole (21), and movable mounting holes (42) are provided at both ends of the movable crossbeam (4).

7. The multifunctional clamping device according to claim 6, characterized in that: The support plate (2) is provided with a plurality of first columns (23) for placing a movable crossbeam (4), a second column (24) for placing a normal length clamping block (51), and a third column (25) for placing an extended length clamping block (52). The first column (23) and the second column (24) are both arranged at the same end of the guide rail (22), and the third column (25) is arranged at the other end of the guide rail (22). The number of the first columns (23) is two, and the two first columns (23) are arranged at the same end of the guide rail (22). ) is equal to the spacing between the two movable mounting holes (42) at both ends of the movable crossbeam (4), the second columns (24) are grouped in two and a plurality of groups are provided on the support plate (2), the spacing between the two second columns (24) in each group is less than or equal to the mounting hole diameter of the first mounting hole (511), the third columns (25) are grouped in two and a plurality of groups are provided on the support plate (2), the spacing between the two third columns (25) in each group is less than or equal to the mounting hole diameter of the second mounting hole (521).

8. The multifunctional clamping device according to claim 1, characterized in that: A positioning plate (26) is provided on the side of the hollow avoidance hole (21) of the support plate (2) away from the fixed crossbeam (3); one end of the positioning plate (26) is horizontally extended in the direction close to the fixed crossbeam (3) and provided with a fixed clamping block (261); the other end is movably provided with a movable clamping block (262); the mounting surfaces of the movable clamping block (262) and the side surface of the positioning plate (26) are provided with saw teeth (263) that are meshed and connected with each other; the movable clamping block (262) is provided with a connecting piece (264) that is detachably connected to the positioning plate (26).

9. The multifunctional clamping device according to claim 1, characterized in that: The upper surface of the base (1) is provided with a plurality of positioning locking mechanisms (11) in a centrally symmetrical manner, and the bottom of the support plate (2) is provided with a rivet used in conjunction with the positioning locking mechanism (11), and the rivet and the positioning locking mechanism (11) are detachably connected.

10. The multifunctional clamping device according to claim 1, characterized in that: Two handles (28) are symmetrically provided on both sides of the support plate (2).

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