Internal expansion clamping and locking device

Abstract

The utility model provides an internal expansion clamping and locking device, which relates to the field of welding auxiliary equipment, and comprises a casing, a driving mechanism, a driving block mechanism, a driven block mechanism and a push rod mechanism, the driving mechanism pushes and pulls a driving block assembly through the push rod mechanism, and the driving block assembly and a spring are matched to push and pull a driven block assembly. Under the driving of the driving block assemblies, the driving block assemblies and the driven block assemblies are sequentially and alternately arranged to form a circular structure, so that expansion clamping and locking are achieved from the interior of a to-be-welded workpiece of a cylindrical structure, through the structural optimization design, the internal expansion clamping and locking device can achieve high-precision clamping and locking, the overall cost is low, popularization is facilitated, and the practicability is high. The market value is high.

Description

Technical Field

[0001] The utility model relates to the field of welding auxiliary equipment, in particular to an internal expansion clamping and locking device. Background Art

[0002] Welding process is a very important technology in industrial production. It usually refers to the process of connecting metal materials or other thermoplastic materials into a whole through heating or high temperature. At present, there is a problem of low welding accuracy for the splicing welding of cylindrical weldments. The main reason is that the weldments are easily deformed by external clamping. In addition, the heat generated during the welding process is difficult to dissipate efficiently, which affects the welding accuracy. Especially for aviation components, the processing accuracy is extremely strict. Therefore, the internal expansion welding clamping technology is introduced. The existing internal expansion welding clamping is a special welding auxiliary technology, which is mainly used in automobile manufacturing and other metal connection processes that require precise control.

[0003] Internal expansion technology, as its name suggests, mainly expands the inner hole of the workpiece by mechanical or hydraulic means to achieve the purpose of positioning and clamping. This technology is widely used in automated production lines. The design and manufacture of existing internal expansion clamping systems are relatively complex, requiring sophisticated control systems and high-precision mechanical components, which are costly and difficult to popularize. Utility Model Content

[0004] The technical problem to be solved by the utility model is to overcome the deficiencies in the prior art and to provide an internal expansion clamping and locking device. Through structural optimization design, the internal expansion clamping and locking device can not only achieve high-precision clamping and locking, but also has low overall cost, is conducive to promotion and popularization, and has great market value.

[0005] The utility model is realized through the following technical solutions:

[0006] An internal expansion clamping and locking device comprises a casing, a driving mechanism, an active block mechanism, a driven block mechanism and a push rod mechanism. The driving mechanism is fixedly connected to the casing, the active block mechanism comprises a plurality of active block assemblies, the driven block mechanism comprises a plurality of driven block assemblies, the active block assemblies and the driven block assemblies are alternately connected to the casing for sliding adjustment, the driving mechanism pushes and pulls the active block assembly through the push rod mechanism, the two ends of the active block assembly abut against the inner side of the driven block assembly, the driven block assembly is connected to the casing through a spring, and the active block assembly and the spring cooperate to push and pull the driven block assembly.

[0007] It can be seen that in the above technical solution, the driving mechanism pushes and pulls the active block assembly through the push rod mechanism, and the active block assembly and the spring cooperate to push and pull the driven block assembly. When the workpiece to be welded needs to be expanded, driven by the active block assembly, the active block assembly and the driven block assembly alternately form a circular structure in sequence, thereby expanding, clamping and locking the workpiece to be welded from the inside of the cylindrical structure. Through structural optimization design, the internal expansion clamping and locking device can not only achieve high-precision clamping and locking, but also has low overall cost, which is conducive to promotion and popularization, and has great market value.

[0008] According to the above technical solution, preferably, the push rod mechanism includes a main push rod and multiple groups of connecting rods, a circular sliding hole matched with the main push rod is provided in the middle of the casing, the connecting rods are arranged at equal angles at one end of the main push rod, the other end of the main push rod is fixedly connected to the free end of the driving mechanism, and the two ends of the connecting rod are respectively hingedly connected to the main push rod and the inner side of the active block assembly.

[0009] It can be seen that in the above technical solution, the driving mechanism pushes and pulls the main push rod to slide along the circular sliding hole, and the main push rod synchronously pushes and pulls the active block assembly to slide through multiple groups of connecting rods set at equal angles, with high control accuracy and stable synchronization effect.

[0010] According to the above technical solution, preferably, the active block assembly includes an active card block and a limit piece, a strip slide groove adapted to the limit piece is provided on the casing, the limit piece is fixedly connected to the lower end of the active card block, and the end of the connecting rod is hingedly connected to the inner side of the active card block.

[0011] It can be seen that in the above technical solution, the active clamping block is slidably adjusted along a fixed stroke under the action of the limiting member.

[0012] According to the above technical solution, preferably, the driven block assembly includes a driven card block and a limit piece, a strip slide groove adapted to the limit piece is provided on the casing, the limit piece is fixedly connected to the lower end of the driven card block, the two ends of the spring are respectively connected to the driven card block and the casing, and a shrinking slide groove with a larger inside and a smaller outside is formed between the two groups of driven cards, and the active card block slides along the shrinking slide groove.

[0013] It can be seen that in the above technical solution, the active block pushes the driven block to slide along a fixed stroke, and the spring pulls the driven block to shrink and slide, so the expansion or contraction of the driven block can be achieved under the cooperation of the active block and the spring.

[0014] According to the above technical solution, preferably, the outer walls of the active clamping block and the driven clamping block are provided with arc bushings, and the outer sides of the arc bushings are provided with arc grooves.

[0015] According to the above technical solution, preferably, the driving mechanism is a cylinder unit, the cylinder unit is fixedly arranged in the casing, and a connecting flange is provided at the end of the casing.

[0016] The beneficial effects of the utility model are:

[0017] (1) The driving mechanism pushes and pulls the active block assembly through the push rod mechanism, and the active block assembly and the spring cooperate to push and pull the driven block assembly. When the workpiece to be welded needs to be tightened, the active block assembly and the driven block assembly are driven by the active block assembly to alternately form a circular structure, thereby tightening, clamping and locking the cylindrical workpiece to be welded;

[0018] (2) Through structural optimization design, this patent enables the internal expansion clamping and locking device to not only achieve high-precision clamping and locking, but also have low overall cost, which is conducive to promotion and popularization and has great market value. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 Shows an isometric structural schematic diagram according to the utility model;

[0020] Figure 2 A schematic diagram of a top view structure according to the utility model is shown;

[0021] Figure 3 A bottom-up structural schematic diagram of the utility model is shown;

[0022] Figure 4 It shows a schematic diagram of the isometric structure of the rear side of the hidden follower block mechanism according to the utility model;

[0023] Description of reference numerals:

[0024] 1. Casing; 2. Driving mechanism; 3. Active block mechanism; 4. Driven block mechanism; 5. Push rod mechanism; 6. Active block assembly; 7. Driven block assembly; 8. Spring; 9. Main push rod; 10. Connecting rod; 11. Active clamping block; 12. Limiting piece; 13. Strip slide; 14. Driven clamping block; 15. Arc bushing; 16. Connecting flange. DETAILED DESCRIPTION

[0025] In order to enable those skilled in the art to better understand the technical solution of the utility model, the utility model is further described in detail below in conjunction with the accompanying drawings and the best embodiment. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the utility model.

[0026] In the description of the utility model, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the utility model.

[0027] As shown in the figure, the utility model provides an internal expansion clamping and locking device, including a housing 1, a driving mechanism 2, an active block mechanism 3, a driven block mechanism 4 and a push rod mechanism 5, the driving mechanism 2 is fixedly connected to the housing 1, wherein the active block mechanism 3 includes a plurality of active block assemblies 6, and the driven block mechanism 4 includes a plurality of driven block assemblies 7, the active block assemblies 6 and the driven block assemblies 7 are alternately formed into a circular structure, the active block assemblies 6 and the driven block assemblies 7 are both connected to the housing 1 for sliding adjustment, the driving mechanism 2 pushes and pulls the active block assembly 6 through the push rod mechanism 5, and the active block assembly The two ends of 6 are against the inner side of the driven block assembly 7, and the driven block assembly 7 is connected to the housing 1 through the spring 8. The active block assembly 6 and the spring 8 cooperate to push and pull the driven block assembly 7, and the push rod mechanism includes a main push rod 9 and multiple groups of connecting rods 10. The middle part of the housing 1 is provided with a circular sliding hole adapted to the main push rod 9. The connecting rod 10 is arranged at an equal angle at one end of the main push rod 9. The other end of the main push rod 9 is fixedly connected to the free end of the driving mechanism 2. The two ends of the connecting rod 10 are respectively hingedly connected to the main push rod 9 and the inner side of the active block assembly 6. The driving mechanism 2 pushes and pulls the main push rod 9 along the circular The main push rod 9 pushes and pulls the active block assembly 6 synchronously through multiple groups of connecting rods 10 set at equal angles to slide, with high control accuracy and stable synchronization effect. The active block assembly 6 includes an active card block 11 and a limiter 12. The housing 1 is provided with a strip-shaped slide groove 13 adapted to the limiter 12. The limiter 12 is fixedly connected to the lower end of the active card block 11. The end of the connecting rod 10 is hingedly connected to the inner side of the active card block 11. The active card block 11 slides and adjusts along a fixed stroke under the action of the limiter 12. In addition, the driven block assembly 7 includes a driven card block 14 And a limit piece 12, a strip slide groove 13 adapted to the limit piece 12 is provided on the casing 1, the limit piece 12 is fixedly connected to the lower end of the driven card block 14, the two ends of the spring 8 are respectively connected to the driven card block 14 and the casing 1, and a shrinking groove with a larger inside and a smaller outside is formed between the two groups of driven card blocks 14, the active card block 11 slides along the shrinking groove, the active card block 11 pushes the driven card block 14 to slide along a fixed stroke, and the spring 8 pulls the driven card block 14 to shrink and slide, so the expansion or contraction of the driven card block 14 can be achieved under the cooperation of the active card block 11 and the spring 8.

[0028] The driving mechanism 2 of the present patent pushes and pulls the active block assembly 6 through the push rod mechanism 5, and the active block assembly 6 and the spring 8 cooperate to push and pull the driven block assembly 7. When the workpiece to be welded needs to be expanded and tightened, under the drive of the active block assembly 6, the active block assembly 6 and the driven block assembly 7 alternately form a circular structure in sequence, thereby expanding, clamping and locking the workpiece to be welded from the inside of the cylindrical structure. Through structural optimization design, the internal expansion clamping and locking device can not only achieve high-precision clamping and locking, but also has low overall cost, which is conducive to promotion and popularization and has great market value.

[0029] Working process:

[0030] The starting process of the internal expansion device: the free end of the driving mechanism 2 pushes the main push rod 9 to slide along the circular sliding hole, and the main push rod 9 synchronously pushes and pulls the active clamping block 11 to slide outward along the shrinking slot through multiple groups of connecting rods 10 set at equal angles, and at the same time, the active clamping block 11 pushes the driven clamping block 14 to slide outward, until multiple groups of active clamping blocks 11 and driven clamping blocks 14 alternately form a circular structure in sequence, at which time the outer walls of the active clamping block 11 and the driven clamping block 14 are against the inner wall of the workpiece to be welded, thereby achieving the clamping and locking of the internal expansion device;

[0031] The closing process of the internal expansion device: the free end of the driving mechanism 2 pulls the main push rod 9 to slide along the circular sliding hole, and the main push rod 9 synchronously pulls the active card block 11 to slide inward along the shrinkage groove through multiple groups of connecting rods 10 set at equal angles. Due to the pulling force of the spring 8, the driven card block 14 slides inward until the outer walls of the active card block 11 and the driven card block 14 are separated from the inner wall of the workpiece to be welded, thereby realizing the closing of the internal expansion device.

[0032] Optionally, in a possible implementation, the outer walls of the active clamping block 11 and the driven clamping block 14 are provided with an arc bushing 15, and the outer side of the arc bushing 15 is provided with an arc groove. The arc bushing 15 has a certain elasticity, so that it can better fit the inner wall of the workpiece to be welded.

[0033] According to the above technical solution, preferably, the driving mechanism 2 is a cylinder unit, which is fixedly arranged in the casing 1. A connecting flange 16 is provided at the end of the casing 1. The free end of the cylinder unit responds quickly, and the connecting flange 16 is convenient for the staff to quickly replace and install.

[0034] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention.

Claims

1. An internal expansion clamping and locking device, characterized in that: It includes a casing, a driving mechanism, an active block mechanism, a driven block mechanism and a push rod mechanism, the driving mechanism is fixedly connected to the casing, the active block mechanism includes multiple groups of active block assemblies, the driven block mechanism includes multiple groups of driven block assemblies, the active block assemblies and the driven block assemblies are alternately formed into a circular structure in sequence, the active block assemblies and the driven block assemblies are both connected to the casing for sliding adjustment, the driving mechanism pushes and pulls the active block assembly through the push rod mechanism, the two ends of the active block assembly are against the inner side of the driven block assembly, the driven block assembly is connected to the casing through a spring, and the active block assembly and the spring cooperate to push and pull the driven block assembly.

2. The internal expansion clamping and locking device according to claim 1, characterized in that: The push rod mechanism includes a main push rod and multiple groups of connecting rods. A circular sliding hole matched with the main push rod is provided in the middle of the casing. The connecting rod is arranged at an equal angle at one end of the main push rod. The other end of the main push rod is fixedly connected to the free end of the driving mechanism. The two ends of the connecting rod are respectively hingedly connected to the main push rod and the inner side of the active block assembly.

3. The internal expansion clamping and locking device according to claim 2, characterized in that: The active block assembly includes an active block and a limiter. The housing is provided with a strip-shaped slide groove adapted to the limiter. The limiter is fixedly connected to the lower end of the active block, and the end of the connecting rod is hingedly connected to the inner side of the active block.

4. The internal expansion clamping and locking device according to claim 3, characterized in that: The driven block assembly includes a driven card block and a limit piece. The housing is provided with a strip slide groove adapted to the limit piece. The limit piece is fixedly connected to the lower end of the driven card block. The two ends of the spring are respectively connected to the driven card block and the housing. A shrinking slide groove with a larger inner part and a smaller outer part is formed between the two groups of driven cards, and the active card block slides along the shrinking slide groove.

5. The internal expansion clamping and locking device according to claim 4, characterized in that: The outer walls of the active clamping block and the driven clamping block are provided with arc bushings, and the outer sides of the arc bushings are provided with arc grooves.

6. The internal expansion clamping and locking device according to claim 5, characterized in that: The driving mechanism is a cylinder unit, which is fixedly arranged in the casing, and a connecting flange is arranged at the end of the casing.

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