A self-locking fixture platform capable of clamping and positioning square tubes

Abstract

The present invention discloses a self-locking fixture platform capable of clamping and positioning square tubes, which includes an upper positioning block, a lower positioning block, a first connecting rod, a second connecting rod, a pressure rod, a locking block, a handle and a base. The lower positioning block and the base are welded to the tooling table. The upper positioning block and the pressure rod are integrated. The first connecting rods at the upper part of the pressure rod are connected to each other by a rotating pair. The second connecting rod and the handle are connected to each other by a rotating pair. A self-locking pin is provided in the middle of the pressure rod, and a groove is provided in the middle of the handle. The first connecting rod and the second connecting rod are also connected to each other by a rotating pair. The locking block and the second connecting rod are connected to each other by two rivets. The pressure rod and the base are connected by a rotating pair, and the handle and the base are connected by a rotating pair. The present invention can meet the requirements of clamping square tubes, the positioning of square tubes is reliable, the overall assembly accuracy requirement is low, it can meet the locking requirement, and it can avoid the situation that the positioning of square tubes becomes loose during the transportation of the tooling or due to vibration, resulting in an increase in positioning error. It can be applied to the fixing and locking of square tubes of various specifications.

Description

Technical Field:

[0001] The present invention relates to a self-locking fixture platform capable of clamping and positioning square tubes, which belongs to the technical field of bus bodies. Background Art:

[0002] Currently, the mainstream body structure design of buses is a six-piece frame body structure. Each large piece is mainly welded by square tubes of various different specifications, and the dimensional control between the square tubes needs to meet the relevant tolerance requirements of the drawings. Normally, when bus enterprises carry out large-scale order production, they generally make each six-piece tooling by themselves to improve production efficiency and the accuracy of the skeleton finished products. However, during the welding operation, due to excessive heat generated by welding, metal parts are prone to deformation. Especially for some long rods with long lengths and low stiffness, generally, clamps are used to fix the square tubes on each tooling. Currently, there are various design schemes for square tube clamps. The present invention is a new type of square tube clamp with a self-locking function, which can be made by general bus enterprises, has sufficient strength and stiffness, is simple to assemble, has strong practicability, and has relatively high reliability in movement. Summary of the Invention:

[0003] The present invention is to provide a self-locking fixture platform capable of clamping and positioning square tubes to solve the above-mentioned problems existing in the prior art. It can solve the problems of square tube clamping and positioning in the square tube welding tooling in the manufacturing industry, control the deformation of square tubes, improve the accuracy of the skeleton welding dimensions, improve the workshop production efficiency, reduce the labor force of workers, and reduce the man-hour cost.

[0004] The technical solution adopted by the present invention is as follows: A self-locking fixture platform capable of clamping and positioning square tubes is welded on a tooling table, and includes an upper positioning block, a lower positioning block, a first connecting rod, a second connecting rod, a pressing rod, a locking block, a handle, and a base. The lower positioning block and the base are welded on the tooling table. The upper positioning block and the pressing rod are integrated. The first connecting rods at the upper part of the pressing rod are connected to each other by a rotating pair. The second connecting rod and the handle are connected to each other by a rotating pair. A self-locking pin is provided in the middle of the pressing rod, and a groove is provided in the middle of the handle. The first connecting rod and the second connecting rod are also connected to each other by a rotating pair. The locking block and the second connecting rod are connected to each other by two rivets. The pressing rod and the base are connected by a rotating pair, and the handle and the base are connected by a rotating pair.

[0005] Further, the groove in the middle of the handle catches the self-locking pin on the pressing rod.

[0006] The present invention has the following beneficial effects:

[0007] (1) The self-locking fixture platform of the present invention that can clamp and position square tubes can meet the requirements of square tube clamping. The square tubes are reliably positioned, the overall assembly accuracy requirements are relatively low, it can meet the locking requirements, and it can avoid the situation that the square tubes are loosened during the tooling transportation or vibration, resulting in an increase in positioning errors. It can be used for fixing and locking square tubes of various specifications.

[0008] (2) The present invention cleverly divides one rod in the standard four-bar linkage mechanism into two (i.e., the first link and the second link). In the self-locking state, three of the entire mechanism's rods (i.e., the pressure rod, the handle, and the base) are connected to form a triangular state, and the defect brought about by dividing one rod into two is compensated by the locking block. In this way, the stable characteristics of the triangle are used to achieve self-locking. This self-locking characteristic is significantly better than the dead-point self-locking of the four-bar linkage mechanism, and the self-locking effect is more reliable. Brief Description of the Drawings:

[0009] Figure 1 It is a structural diagram of the self-locking fixture platform of the present invention that can clamp and position square tubes.

[0010] Figure 2 It is another structural diagram of the self-locking fixture platform of the present invention that can clamp and position square tubes.

[0011] Figure 3 It is a side view of the self-locking fixture platform of the present invention that can clamp and position square tubes. Detailed Description of the Invention:

[0012] The following further describes the present invention with reference to the drawings.

[0013] The self-locking fixture platform of the present invention that can clamp and position square tubes is welded to the tooling table. It includes an upper positioning block 1, a lower positioning block 2, a first link 3, a second link 4, a pressure rod 5, a locking block 6, a handle 7, and a base 9. The lower positioning block 2 and the base 9 are welded to the tooling table. The upper positioning block 1 and the pressure rod 5 are integrated. The pressure rod 5 and the first link 3 above it are connected by a pin with a rotating pair. The second link 4 and the handle 7 are connected by a pin with a rotating pair. A self-locking pin 8 is provided on the back of the pressure rod 5. A groove is provided in the middle of the handle 7. The first link 3 and the second link 4 are also connected to each other by a rotating pair. Among them, the locking block 6 is fixed to the second link 4 by two rivets. The positional relationship between the locking block 6 and the first link 3 is on the same plane. The pressure rod 5 and the base 9 are connected by a rotating pair. The handle 7 and the base 9 are connected by a rotating pair.

[0014] During operation, the square tube is placed between the upper positioning block 1 and the lower positioning block 2. At this time, rotate the handle 7 counterclockwise. The second connecting rod 4 drives the first connecting rod 3, causing the angle between the two connecting rods to start shrinking until the locking block 6 on the second connecting rod 4 abuts against the first connecting rod 3. At this time, the first connecting rod 3 and the second connecting rod 4 rotate downward simultaneously until the pressure rod 5 presses tightly against the upper part of the square tube. At this time, the groove in the middle of the handle 7 catches the self-locking pin 8 on the pressure rod 5. Since the pressure rod 5, the handle 7, and the base 9 form a stable triangular mechanism with each other, when the square tube vibrates, or the pressure rod 5 is subjected to vibration or impact, the pressure rod 5 will not move. At this time, the fixation of the square tube is achieved, and five degrees of freedom of the square tube are simultaneously controlled, and the entire set of equipment presents a locked state.

[0015] When releasing the square tube, rotate the handle 7 clockwise. The groove in the middle of the handle 7 leaves the self-locking pin 8 (at this time, the pressure rod 5 does not move). The angles of the first connecting rod 3 and the second connecting rod 4 start to increase until the right side of the locking block 6 abuts against the end of the first connecting rod 3. At this time, the angles of the two connecting rods no longer change, and the pressure rod 5 and the handle 7 rotate clockwise simultaneously, and the square tube is released.

[0016] The self-locking fixture platform of the present invention that can clamp and position a square tube is essentially a deformed mechanism of a double-rocker mechanism, and uses the stability of a triangle to achieve locking. Compared with the locking principles of other fixtures, this device has high locking reliability and fewer degrees of freedom. Moreover, the self-locking fixture platform of the present invention that can clamp and position a square tube requires less material and has strong production processability, meeting the requirements for fixing square tubes in various manufacturing industries.

[0017] The self-locking fixture platform of the present invention that can clamp and position a square tube can meet the requirements for clamping the square tube. The square tube is reliably positioned, and the overall assembly accuracy requirement is relatively low. It can meet the locking requirements, avoiding the situation where the square tube positioning becomes loose during the tooling transportation process or due to vibration, resulting in an increase in positioning error. It can be used for fixing and locking square tubes of various specifications.

[0018] Currently, general square tube fixtures on the market use "dead point" self-locking, that is, they use the dead point principle similar to that of a classic connecting rod mechanism for self-locking. This self-locking has a prerequisite, that is, a certain damping is required for the opening and closing of the fixture. Although this fixture essentially also uses a connecting rod mechanism, it does not use the "dead point" characteristic of the connecting rod mechanism for self-locking. Instead, it cleverly divides one rod in the standard four-link mechanism into two (that is, Figure 1 the connecting rod 3 and the connecting rod 4 in the attachment), and then takes three of the entire mechanism's rods (that is, the pressure rod, the handle, and the base) to form a triangular state. The defect brought about by dividing one rod into two is compensated by the locking block 6. In this way, the stable characteristic of the triangle is used to achieve self-locking. This self-locking characteristic is significantly better than the dead point self-locking of the four-bar mechanism, and the self-locking effect is more reliable.

[0019] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, several improvements can be made without departing from the principle of the present invention, and these improvements should also be regarded as the protection scope of the present invention.

Claims

1. A self-locking fixture platform capable of clamping and positioning square tubes, welded to a tooling table, characterized in that: It includes an upper positioning block (1), a lower positioning block (2), a first connecting rod (3), a second connecting rod (4), a pressure rod (5), a locking block (6), a handle (7) and a base (9). The lower positioning block (2) and the base (9) are welded to the tooling table. The upper positioning block (1) and the pressure rod (5) are integrated. The first connecting rods (3) on the upper part of the pressure rod (5) are connected to each other by a rotating pair. The second connecting rod (4) and the handle (7) are connected to each other by a rotating pair. A self-locking pin (8) is provided in the middle of the pressure rod (5), and a groove is provided in the middle of the handle (7). The first connecting rod (3) and the second connecting rod (4) are also connected to each other by a rotating pair. The locking block (6) and the second connecting rod (4) are connected to each other by two rivets. The pressure rod (5) and the base (9) are connected by a rotating pair, and the handle (7) and the base (9) are connected by a rotating pair; During operation, the square tube is placed between the upper positioning block (1) and the lower positioning block (2). At this time, the handle (7) is rotated counterclockwise. The second connecting rod (4) drives the first connecting rod (3) to make the angles of the two connecting rods start to shrink until the locking block (6) on the second connecting rod (4) abuts against the first connecting rod (3). At this time, the first connecting rod (3) and the second connecting rod (4) rotate downward simultaneously until the pressure rod (5) presses tightly against the upper part of the square tube. At this time, the groove in the middle of the handle (7) catches the self-locking pin (8) on the pressure rod (5). Since the pressure rod (5), the handle (7) and the base (9) form a stable triangular mechanism with each other, when the square tube shakes, or the pressure rod (5) is shaken or impacted, the pressure rod (5) will not move. At this time, the fixation of the square tube is realized, and the square tube is simultaneously controlled in five degrees of freedom, and the whole set of equipment presents a locked state; When releasing the square tube, the handle (7) is rotated clockwise. The groove in the middle of the handle (7) leaves the self-locking pin (8). The angles of the first connecting rod (3) and the second connecting rod (4) start to increase until the right side of the locking block (6) abuts against the end of the first connecting rod (3). At this time, the angles of the two connecting rods no longer change, and the pressure rod (5) and the handle (7) rotate clockwise simultaneously, and the square tube is released.

2. The self-locking fixture platform capable of clamping and positioning a square tube as described in claim 1, wherein: The groove in the middle of the handle (7) catches the self-locking pin (8) on the pressure rod (5).

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