A clamping mechanism and a fixture

Abstract

The present invention discloses a clamping mechanism and a fixture, comprising at least one clamping assembly, wherein at least a portion of the clamping assembly is provided with a clamping portion; a first connecting member is rotatably connected to the clamping assembly via a first rotating shaft, a first rotating fixed point is provided on the first connecting member, two first rotating shafts and two first rotating fixed points form a parallelogram structure, the first connecting member rotates with the first rotating fixed point to adjust the distance between the clamping assembly and the first rotating fixed point, thereby adjusting the height of the clamping portion, and cooperating with a limiting surface for supporting the bottom of a workpiece to achieve workpiece clamping, that is, vertical downward clamping can be achieved. The clamping portion is arranged at the end of the clamping assembly, so that when the parallelogram is deformed in parallel, the movement trajectory of the clamping portion is arc-shaped downward, and a lateral limiting surface is cooperated to achieve horizontal clamping of the workpiece, that is, the force of the clamping portion is obliquely downward, and horizontal lateral clamping can be achieved.

Description

Technical Field

[0001] The invention belongs to the field of a clamping mechanism for a workpiece, and in particular relates to a clamping mechanism and a fixture. Background Art

[0002] The fixture is used to install the workpiece quickly, conveniently and safely. The welding fixture is a device used to fix the processing object in the correct position during the processing to ensure that the weldment reaches the required size and shape under high temperature conditions. Its quality directly affects the size and shape accuracy of the weldment. In the door frame welding production process of steel doors, anti-theft doors and other products, since the length and width of the steel plate used are much larger than the thickness of the steel plate, it is very easy to deform during the welding process. For example, the Chinese patent CN201632795 "Door Frame Welding Fixture" can only achieve horizontal clamping, but cannot be compressed in the thickness direction. Therefore, there will be a height difference between the two steel plates that need to be welded, which affects the quality rate of the finished welded product. Therefore, it is very important to obtain a clamping mechanism and tooling fixture that overcome the above defects. Summary of the invention

[0003] In order to solve at least one of the above technical problems, on the one hand, the present invention provides a clamping mechanism, comprising:

[0004] At least one clamping assembly, wherein at least a portion of the clamping assembly is provided with a clamping portion;

[0005] At least two first connecting members, the first connecting members are rotatably connected to the clamping assembly via a first rotating shaft, a first rotating fixed point is provided on the first connecting member, two first rotating shafts and two first rotating fixed points form a parallelogram structure, the first connecting member rotates about the first rotating fixed point to adjust the distance between the clamping assembly and the first rotating fixed point, and then adjust the height of the clamping part, in conjunction with the limiting surface for supporting the bottom of the workpiece, to achieve workpiece clamping, that is, vertical downward clamping can be achieved.

[0006] At least one of the clamping parts is arranged at the end of the clamping assembly so that when the parallelogram is deformed in parallel, the movement trajectory of the clamping part is arc-shaped downward, and cooperates with a lateral limiting surface to achieve horizontal clamping of the workpiece, that is, the force of the clamping part is obliquely downward, so as to achieve horizontal lateral clamping.

[0007] Through the above technical solution, the present invention can achieve multi-directional clamping, can achieve the same horizontal height of two plates to be welded, without height difference, and increase the welding yield rate.

[0008] The clamping assembly includes a clamping rod and an adapter block fixed to the clamping rod, wherein at least a portion of the adapter block is adapted to the workpiece in shape, and the first connecting member is disposed on the clamping rod.

[0009] It also includes a second connecting member, which is fixedly arranged. The first connecting member is rotatably connected to the second connecting member via a second rotating shaft, and the second rotating shaft forms the first rotating fixed point.

[0010] It also includes a driving mechanism, wherein the output end of the driving mechanism is rotationally connected to the clamping assembly via a third rotating shaft, and the driving mechanism is connected to a second rotating fixed point.

[0011] Through the above technical solution, the drive mechanism outputs extension to control the first connecting member to move horizontally downward, thereby realizing the arc-shaped downward movement of the clamping portion at the end to achieve downward clamping and outward pushing and clamping.

[0012] On the other hand, the present invention provides a fixture, comprising at least one clamping station, wherein the clamping station is provided with at least one workpiece placement area, wherein the clamping station is provided with at least one of the above-mentioned clamping mechanisms, at least one first clamping member, at least one first limiting portion, at least one second clamping member, and at least one second limiting portion, wherein the first clamping member and the first limiting portion are arranged on opposite sides outside the workpiece placement area, and the second clamping member and the second limiting portion are arranged on opposite sides outside the workpiece placement area, and when the first clamping member and the second clamping member are in action, the workpiece contacts the first limiting portion and the second limiting portion to achieve force balance on the circumferential side of the workpiece and is limitedly clamped;

[0013] The clamping mechanism acts on the workpiece in the thickness direction of the workpiece to limit the position of the workpiece in the thickness direction.

[0014] The clamping mechanism is arranged in the workpiece placement area, and a third limiting portion is provided on the workpiece. When the clamping mechanism is in an arc downward, it acts on the workpiece in the thickness direction and acts obliquely downward on the third limiting portion to limit the workpiece to the first clamping member, or the second clamping member, or the first limiting portion, or the second limiting portion.

[0015] It also includes a first limit block, and a side surface of the first limit block close to the workpiece placement area at least partially forms the first limit portion; it also includes a second limit block, and a side surface of the second limit block close to the workpiece placement area at least partially forms the second limit portion; it also includes an L-shaped limit block, and the two side surfaces of the L-shaped limit block close to the workpiece placement area form the first limit portion and / or the second limit portion.

[0016] The clamping mechanism is provided with two, acting on the upper and lower ends of the same side of the workpiece respectively. The two L-shaped limit blocks cooperate with the adapter block of the clamping mechanism, that is, at least a portion of the outer shape of the adapter block is an L-shaped protrusion to cooperate with the groove portion of the L-shaped limit block, so as to clamp and limit the third limit portion between the adapter block and the first limit portion, and / or between the adapter block and the second limit portion.

[0017] It also includes a workbench, the clamping station is configured on the workbench, the workbench is provided with a first slide groove, and the first limit block is adjustably fixed on the first slide groove through the first slide groove; the workbench is provided with a second slide groove, and the L-shaped limit block is adjustably fixed on the second slide groove through the second slide groove.

[0018] The first clamping member and the second clamping member can be cylinders, two of which are respectively provided and fixed on the workbench. The second limit block is fixed on the workbench. The workbench is formed by a plurality of supporting square tubes fixedly connected. A fixed plate is fixed between at least two supporting square tubes. The clamping mechanism is fixed on the fixed plate, that is, the second connecting member and the third connecting member are fixed on the fixed plate.

[0019] Through the above technical solution, the setting of the slide groove can be adapted to door frames of various lengths, widths and heights for clamping and fixing during welding.

[0020] Compared with the prior art, the advantages of the present invention are: the present invention has a simple structure, can adapt to the welding of door frames of different specifications, can avoid the height difference between two pipes during welding, increase welding efficiency, and effectively reduce production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a three-dimensional diagram of the clamping mechanism of the present invention;

[0022] Figure 2 This is a side view of the clamping mechanism of the present invention being put into use;

[0023] Figure 3 It is a three-dimensional diagram of the fixture of the present invention;

[0024] Figure 4 It is a schematic cross-sectional view of a part of the present invention put into use;

[0025] Reference numerals:

[0026] 1 clamping mechanism; 101 clamping assembly; 1011 clamping rod; 1012 adapter block; 1013 clamping portion; 102 first connecting member; 103 first rotating shaft; 104 first rotating fixed point; 105 second connecting member; 106 second rotating shaft;

[0027] 2 driving mechanism; 201 third rotating shaft; 202 second rotating fixed point; 203 third connecting member; 204 fourth connecting member; 205 fourth rotating shaft; 206 fifth connecting member;

[0028] 301 is a limiting surface for supporting the bottom of the workpiece; 302 is a lateral limiting surface;

[0029] 4 workpiece; 401 third limiting part;

[0030] 5 workbench; 501 clamping station; 502 workpiece placement area; 503 first clamping member; 504 first limiting block; 505 first limiting portion; 506 second limiting block; 507 second limiting portion; 508 L-shaped limiting block; 509 first slide groove; 510 second slide groove; 511 fixing plate; 512 second clamping member;

[0031] 6 gaps. DETAILED DESCRIPTION

[0032] In order to enable those skilled in the art to better understand the present invention, and thus to more clearly define the scope of the protection claimed in the present invention, the present invention is described in detail with respect to certain specific embodiments of the present invention. It should be noted that the following are only certain specific implementations of the present invention, which are only some embodiments of the present invention, wherein the specific and direct description of the relevant structures is only for the convenience of understanding the present invention, and each specific feature does not naturally and directly limit the scope of implementation of the present invention.

[0033] Referring to the accompanying drawings, the present invention adopts the following technical solutions. On the one hand, the present invention provides a clamping mechanism 1, comprising:

[0034] At least one pressing assembly 101, wherein at least a portion of the pressing assembly 101 is provided with a pressing portion 1013;

[0035] At least two first connecting members 102 are rotatably connected to the clamping assembly 101 through a first rotating shaft 103. A first rotating fixed point 104 is provided on the first connecting member 102. The two first rotating shafts 103 and the two first rotating fixed points 104 form a parallelogram structure. The first connecting member 102 rotates with the first rotating fixed point 104 to adjust the distance between the clamping assembly 101 and the first rotating fixed point 104, thereby adjusting the height of the clamping portion 1013, and cooperating with the limiting surface 301 for supporting the bottom of the workpiece to achieve the clamping of the workpiece 4, that is, the downward clamping in the vertical direction can be achieved.

[0036] At least one of the clamping parts 1013 is arranged at the end of the clamping assembly 101, so that when the parallelogram is deformed in parallel, the movement trajectory of the clamping part 1013 is arc-shaped downward, and cooperates with a lateral limiting surface 302 to achieve horizontal clamping of the workpiece 4, that is, the force of the clamping part 1013 is obliquely downward, so as to achieve horizontal lateral clamping.

[0037] Through the above technical solution, the present invention can achieve multi-directional clamping, can achieve the same horizontal height of two plates to be welded, without height difference, and increase the welding yield rate.

[0038] The clamping assembly 101 includes a clamping rod 1011 and an adapter block 1012 fixed to the clamping rod 1011 . The adapter block 1012 is at least partially shaped to fit the workpiece 4 . The first connecting member 102 is disposed on the clamping rod 1011 .

[0039] In this embodiment, four first connecting members 102 are provided, which are divided into two groups and respectively arranged on both sides of the clamping rod 1011. The adapter block 1012 is connected to the clamping rod 1011 through a fastener, wherein a plurality of mounting holes can be linearly opened on the clamping rod 1011 and the adapter block 1012, and the length between the clamping rod 1011 and the adapter block 1012 can be adjusted by connecting different mounting holes through fasteners.

[0040] The second connecting member 105 is also included. The second connecting member 105 is fixedly arranged. The first connecting member 102 is rotatably connected to the second connecting member 105 via a second rotating shaft 106 . The center of the second rotating shaft 106 forms the first rotating fixed point 104 .

[0041] It also includes a driving mechanism 2 , the output end of the driving mechanism 2 is rotatably connected to the clamping assembly 101 via a third rotating shaft 201 , and the driving mechanism 2 is connected to a second rotating fixed point 202 .

[0042] It also includes a third fixed connection member 203, the driving mechanism 2 is fixedly connected with a fourth connection member 204, the fourth connection member 204 and the third connection member 203 are rotationally connected via a fourth rotating shaft 205, the center of the fourth rotating shaft 205 forms the second rotation fixed point 202, and the output end of the driving mechanism 2 is fixed with a fifth connection member 206, the fifth connection member 206 is connected to the clamping rod 1011 via the third rotating shaft 201. The driving mechanism 2 can be a driving cylinder, or an electric telescopic rod, or an electric linear guide, the electric linear guide is fixedly connected with the fourth connection member 204, and its slider is rotationally connected with the clamping rod 1011.

[0043] Through the above technical solution, the drive mechanism 2 outputs extension to control the first connecting member 102 to move horizontally downward, thereby realizing the clamping portion 1013 at the end to arc downward to achieve downward clamping and outward pushing and clamping.

[0044] On the other hand, the present invention provides a fixture, comprising at least one clamping station 501, wherein the clamping station 501 is provided with at least one workpiece placement area 502, wherein the clamping station 501 is provided with at least one clamping mechanism 1, at least one first clamping member 503, at least one first limiting portion 505, at least one second clamping member 512, and at least one second limiting portion 507, wherein the first clamping member 503 and the first limiting portion 505 are respectively arranged on opposite sides outside the workpiece placement area 502, and the second clamping member 512 and the second limiting portion 507 are respectively arranged on opposite sides outside the workpiece placement area 502, and when the first clamping member 503 and the second clamping member 512 are in action, the workpiece 4 contacts the first limiting portion 505 and the second limiting portion 507 to achieve a circumferential force balance of the workpiece 4 and is clamped by limiting position;

[0045] The clamping mechanism 1 acts on the workpiece 4 in the thickness direction of the workpiece 4 to limit the workpiece 4 in the thickness direction.

[0046] The clamping mechanism 1 is arranged in the workpiece placement area 502, and a third limiting portion 401 is provided on the workpiece 4. When the clamping mechanism 1 is in an arc downward, it acts on the workpiece 4 in the thickness direction and acts obliquely downward on the third limiting portion 401 to limit the workpiece 4 to the first clamping member 503, or the second clamping member 512, or the first limiting portion 505, or the second limiting portion 507.

[0047] It also includes a first limit block 504, and a side of the first limit block 504 close to the workpiece placement area 502 at least partially forms the first limit portion 505; it also includes a second limit block 506, and a side of the second limit block 506 close to the workpiece placement area 502 at least partially forms the second limit portion 507; it also includes an L-shaped limit block 508, and the two sides of the L-shaped limit block 508 close to the workpiece placement area 502 form the first limit portion 505 and / or the second limit portion 507.

[0048] In this embodiment, two clamping mechanisms 1 are provided, which respectively act on the upper and lower ends of the same side of the workpiece 4. The two L-shaped limit blocks 508 cooperate with the adapter block 1012 of the clamping mechanism 1, that is, at least a portion of the outer shape of the adapter block 1012 is an L-shaped protrusion to cooperate with the groove portion of the L-shaped limit block 508, so as to clamp and limit the third limit portion 401 between the adapter block 1012 and the first limit portion 505, and / or between the adapter block 1012 and the second limit portion 507.

[0049] It also includes a workbench 5, the clamping station 501 is configured on the workbench 5, the workbench 5 is provided with a first slide groove 509, and the first limit block 504 is adjustably fixed to the first slide groove 509 through the first slide groove 509; the workbench 5 is provided with a second slide groove 510, and the L-shaped limit block 508 is adjustably fixed to the second slide groove 510 through the second slide groove 510.

[0050] The lateral limiting surface 302 mentioned above is the first limiting portion 505 or the second limiting portion 507 .

[0051] The first clamping member 503 and the second clamping member 512 can be cylinders, two of which are respectively provided and fixed on the workbench 5. The second limit block 506 is fixed on the workbench 5. The workbench 5 is formed by a plurality of supporting square tubes fixedly connected. A fixing plate 511 is fixed between at least two supporting square tubes. The clamping mechanism 1 is fixed on the fixing plate 511, that is, the second connecting member 105 and the third connecting member 203 are fixed on the fixing plate 511.

[0052] Through the above technical solution, the setting of the slide groove can be adapted to door frames of various lengths, widths and heights for clamping and fixing during welding.

[0053] When put into use, the positions of the first limit block 504 and the L-shaped limit block 508 can be adjusted according to the size of the door frame to be welded. After the positions are fixed by fasteners, the output ends of the first pressing member 503 and the second pressing member 512 extend out to contact the door frame to the first limit portion 505 and the second limit portion 507 to achieve rough limit. Figure 3 As shown, on one of the L-shaped stoppers, the inner wall on one side does not conflict with the outer wall of the door frame, that is, there is a gap 6;

[0054] Subsequently, the driving mechanism 2 works to control the clamping portion 1013 at the end to arc downward, which can not only clamp the workpiece 4 from top to bottom, but also clamp the third limiting portion 401 from inside to outside to at least one side of the groove of the L-shaped limiting block 508; welding is then achieved.

[0055] It is worth mentioning that a hollow can be opened on the adapter block 1012 to expose the part that needs to be welded. After partial welding, the height difference between the two will not change, and the adapter block 1012 can be opened again to achieve welding of other parts pressed by the adapter block 1012.

[0056] Compared with the prior art, the advantages of the present invention are: the present invention has a simple structure, can adapt to the welding of door frames of different specifications, can avoid the height difference between two pipes during welding, increase welding efficiency, and effectively reduce production costs.

[0057] So far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

Claims

1. A clamping mechanism, characterized in that: include: At least one pressing assembly (101), wherein a pressing portion (1013) is at least partially provided on the pressing assembly (101); At least two first connecting members (102), the first connecting members (102) are rotatably connected to the clamping assembly (101) via a first rotating shaft (103), a first rotating fixed point (104) is provided on the first connecting member (102), the two first rotating shafts (103) and the two first rotating fixed points (104) form a parallelogram structure, the first connecting member (102) rotates about the first rotating fixed point (104) to adjust the distance between the clamping assembly (101) and the first rotating fixed point (104), and further adjust the height of the clamping portion (1013) to achieve clamping of the workpiece (4).

2. The clamping mechanism according to claim 1, characterized in that: At least one of the clamping parts (1013) is arranged at the end of the clamping assembly (101), so that when the parallelogram is deformed in parallel, the movement trajectory of the clamping part (1013) is arc-shaped downward to achieve horizontal clamping of the workpiece (4).

3. The clamping mechanism according to claim 1 or 2, characterized in that: The clamping assembly (101) comprises a clamping rod (1011) and an adapting block (1012) fixed to the clamping rod (1011); the adapting block (1012) is at least partially adapted in shape to the workpiece (4); and the first connecting member (102) is arranged on the clamping rod (1011).

4. The clamping mechanism according to claim 1, characterized in that: It also includes a second connecting member (105), the second connecting member (105) is fixedly arranged, the first connecting member (102) is rotatably connected to the second connecting member (105) via a second rotating shaft (106), and the second rotating shaft (106) forms the first rotating fixed point (104).

5. The clamping mechanism according to claim 1, characterized in that: It also comprises a driving mechanism (2), the output end of the driving mechanism (2) being rotationally connected to the clamping assembly (101) via a third rotating shaft (201), and the driving mechanism (2) being connected to a second rotating fixed point (202).

6. A fixture, characterized in that: The invention comprises at least one clamping station (501), wherein at least one workpiece placement area (502) is provided on the clamping station (501), wherein at least one clamping mechanism as described in claims 1 to 5, at least one first clamping member (503), at least one first limiting portion (505), at least one second clamping member (512), and at least one second limiting portion (507) are provided on the clamping station (501), wherein the first clamping member (503) and the first limiting portion (505) are arranged on opposite sides outside the workpiece placement area (502), and the second clamping member (512) and the second limiting portion (507) are arranged on opposite sides outside the workpiece placement area (502), and when the first clamping member (503) and the second clamping member (512) are in action, the workpiece (4) contacts the first limiting portion (505) and the second limiting portion (507) to achieve force balance on the circumference of the workpiece (4) and is limited and clamped; The clamping mechanism (1) acts on the workpiece (4) in the thickness direction of the workpiece (4) to achieve position limiting of the workpiece (4) in the thickness direction.

7. The fixture according to claim 6, characterized in that: The clamping mechanism (1) is arranged in the workpiece placement area (502), and a third limiting portion (401) is provided on the workpiece (4). When the clamping mechanism (1) is in an arc-shaped downward direction, it acts on the workpiece (4) in the thickness direction and acts obliquely downward on the third limiting portion (401) to limit the workpiece (4) to the first clamping member (503), or the second clamping member (512), or the first limiting portion (505), or the second limiting portion (507).

8. The fixture according to claim 7, characterized in that: It also includes a first limiting block (504), wherein a side surface of the first limiting block (504) close to the workpiece placement area (502) at least partially forms the first limiting portion (505); And / or, further comprising a second limiting block (506), wherein a side surface of the second limiting block (506) close to the workpiece placement area (502) at least partially forms the second limiting portion (507); And / or, it also includes an L-shaped limit block (508), and the two side surfaces of the L-shaped limit block (508) close to the workpiece placement area (502) form the first limit portion (505) and / or the second limit portion (507).

9. The fixture according to claim 8, characterized in that: The clamping mechanism (1) is provided with two, respectively acting on the upper and lower ends of the same side of the workpiece (4); And / or, further comprising a workbench (5), the clamping station (501) being arranged on the workbench (5), the workbench (5) being provided with a first slide groove (509), the first limit block (504) being adjustably fixed on the first slide groove (509) through the first slide groove (509); And / or, a second slide groove (510) is provided on the workbench (5), and the L-shaped limit block (508) is adjustably fixed on the second slide groove (510) through the second slide groove (510).

10. The fixture according to claim 9, characterized in that: The two L-shaped limit blocks (508) cooperate with the adapter block (1012) of the clamping mechanism (1), that is, at least a portion of the outer shape of the adapter block (1012) is an L-shaped protrusion to cooperate with the groove portion of the L-shaped limit block (508), so as to clamp and limit the third limit portion (401) between the adapter block (1012) and the first limit portion (505), and / or between the adapter block (1012) and the second limit portion (507).

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