Pre-tensioning equipment of wedge-shaped clamping device

Abstract

The invention discloses pre-tensioning equipment of a wedge-shaped clamping device, and belongs to the technical field of workpiece pre-tensioning. The device comprises a front transition conveying assembly, a fixed end clamping assembly, a middle connection conveying assembly, a tensioning end clamping assembly and a rear transition conveying assembly which are sequentially arranged along a straight line; the fixed end clamping assembly comprises a fixed base and a clamping device arranged on the fixed base. The tensioning end clamping assembly comprises a sliding base, a sliding trolley sliding on the sliding base, a tensioning driving device arranged between the sliding trolley and the sliding base, and a clamping device arranged on the sliding trolley. The clamping device comprises a clamping base, clamping sliding blocks, a hollow connecting column, a clamping driving device and an elastic reset piece, one end of the clamping driving device is fixedly arranged, the other end of the clamping driving device is connected with the clamping base so as to drive the clamping base to move along the hollow connecting column, and the hollow connecting column pushes the two clamping sliding blocks to the narrow end of the wedge-shaped opening in an abutting mode to achieve the opposite clamping action. The steel bar pre-tensioning device can continuously conduct pre-tensioning machining on steel bars, and the machining efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of workpiece pre-tensioning, and in particular to a pre-tensioning device of a wedge-shaped clamping device. Background Art

[0002] In the tensioning process of steel bars, usually only one can be fixed and tensioned one by one. For example, the Chinese invention patent with patent number ZL201910957113.3 discloses a prestressed steel bar tensioning and release device, including: a release mechanism, a tensioning mechanism and a clamping mechanism. During the tensioning process, the steel bar to be prestressed is first clamped by the clamping mechanism, and then the tensioning motor drives the tensioning screw to rotate, changing the length of the tensioning screw, thereby changing the position of the clamping mechanism, pulling the steel bar to a preset length, and maintaining the prestress through the hydraulic rod after pulling to the preset length.

[0003] Therefore, the existing steel bar tensioning equipment lacks passability and continuity, and the processing efficiency is low. Summary of the invention

[0004] The purpose of the present invention is to solve the problems existing in the above-mentioned prior art and to provide a pre-tensioning device of a wedge-shaped clamping device, which can continuously perform pre-tensioning processing of steel bars and improve processing efficiency.

[0005] The objective of the present invention is achieved through the following technical solutions: A pre-tensioning device of a wedge-shaped clamping device comprises a front transition conveying assembly, a fixed end clamping assembly, an intermediate connecting conveying assembly, a tensioning end clamping assembly, and a rear transition conveying assembly which are sequentially arranged along a straight line; The fixed end clamping assembly comprises a fixed base and a clamping device arranged on the fixed base; The tensioning end clamping assembly comprises a sliding base, a trolley sliding on the sliding base, a tensioning driving device arranged between the trolley and the sliding base, and a clamping device arranged on the trolley; The clamping device includes a clamping seat, a clamping slider, a hollow connecting column, a clamping drive device, and an elastic reset member. A wedge-shaped opening and a connecting hole are provided in the clamping seat, and two clamping sliders are respectively slidably connected to two opposite inclined surfaces of the wedge-shaped opening; one end of the hollow connecting column is fixedly arranged, and the other end is slidably connected to the connecting hole; the elastic reset member connects the clamping seat and the clamping slider to maintain the interference relationship between the clamping slider and the end of the hollow connecting column; one end of the clamping drive device is fixedly arranged, and the other end is connected to the clamping seat to drive the clamping seat to move along the hollow connecting column, and the hollow connecting column pushes the two clamping sliders to the narrower end of the wedge-shaped opening to realize the clamping action towards each other.

[0006] Preferably, the clamping device comprises a clamping mounting seat and a plurality of clamping seats, the plurality of clamping seats are arranged side by side on the clamping mounting seat, and the clamping driving device drives the clamping mounting seat to move.

[0007] Preferably, the clamping mounting seat is provided with a ball head floating joint, the ball head floating joint is provided with a force sensor, and the force sensor is connected to the clamping drive device.

[0008] Preferably, side blocks are provided on both sides of the clamping seat, and limiting strips are provided on the side blocks extending into the wedge-shaped opening. A limiting groove is formed between the limiting strip and the inclined surface of the wedge-shaped opening, and limiting strips cooperating with the limiting groove are provided on both sides of the clamping slider.

[0009] Preferably, a guide slot is provided at one end of the hollow connecting column that abuts against the clamping slider, and a guide slider matching the guide slot is provided on the clamping slider.

[0010] Preferably, a limiting groove is provided on the side of the hollow connecting column, and a limiting bolt extending into the limiting groove is provided on the clamping seat.

[0011] Preferably, a clamping groove is provided on the clamping surface of the clamping slider, and friction lines are provided in the clamping groove.

[0012] Preferably, the clamping slider comprises a slider seat and a clamping block which are detachably connected to each other, and the clamping groove is arranged on the clamping block.

[0013] Preferably, a slot is provided in the slider seat, a block matching the slot is provided on the clamping block, and a locking handle is threadedly connected to the side surface of the slider seat and inwardly abuts against the clamping block.

[0014] Preferably, at least one of the opposite sides of the fixed-end clamping assembly and the tensioning-end clamping assembly is provided with a lifting and lowering blocking mechanism.

[0015] The advantages of the present invention are: 1. This equipment can be directly connected to the existing steel bar conveying line, that is, it can pre-tension the steel bars along the conveying direction, thereby realizing continuous production and processing operations and greatly improving processing efficiency; 2. This equipment can pre-tension multiple steel bars at the same time, improve processing efficiency, and ensure that the clamping force and tension force of each steel bar are consistent, ensuring processing quality; 3. This equipment can automatically complete the process of steel bar loading, pre-tensioning and unloading, reduce the labor burden, improve processing efficiency, reduce the impact of human factors, and ensure processing quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1A schematic diagram of the structure of a pre-tensioning device of a wedge-shaped clamping device provided in an embodiment of this specification; Figure 2 for Figure 1 A schematic diagram of the enlarged structure at A in the middle; Figure 3 A schematic diagram of the structure of the fixed end clamping assembly provided in the embodiment of this specification; Figure 4 A schematic diagram of the structure of the clamping device provided in the embodiment of this specification; Figure 5 A schematic diagram of the structure of a single clamping mechanism in the clamping device provided in the embodiment of this specification; Figure 6 A cross-sectional view of a single clamping mechanism in a clamping device provided in an embodiment of this specification; Figure 7 A side view of a single clamping mechanism in a clamping device provided in an embodiment of this specification; Figure 8 A schematic diagram of the structure of the clamping seat provided in the embodiment of this specification; Fig. 9 A schematic diagram of the structure of the slider seat provided in the embodiment of this specification; Fig.10 A schematic diagram of the structure of a hollow connecting column provided in an embodiment of this specification; Fig.11 A schematic diagram of the structure of the tension end clamping assembly provided in the embodiment of this specification; Fig.12 for Figure 1 Schematic diagram of the enlarged structure at point B in the middle. DETAILED DESCRIPTION

[0017] The present invention will be further described in detail below with reference to the accompanying drawings and specific implementation modes.

[0018] like Figure 1As shown, the present embodiment provides a pre-tensioning device of a wedge-shaped clamping device, comprising a front transition conveying assembly 1, a fixed end clamping assembly 2, an intermediate connection conveying assembly 3, a tensioning end clamping assembly 4, and a rear transition conveying assembly 5 which are sequentially arranged along a straight line; the overall design concept of the present device is as follows: the front transition conveying assembly 1 is used to receive the steel bars conveyed by the upstream equipment of the steel bar processing assembly line, and continuously provide the power for conveying the steel bars forward; under the conveying action of the front transition conveying assembly 1, the steel bars pass through the fixed end clamping assembly 2 and enter the intermediate connection conveying assembly 3, and the intermediate connection conveying assembly 3 also provides the power for the steel bars to continue to be conveyed forward, and the intermediate connection conveying assembly 3 The length of the conveying assembly 3 can be designed according to the actual length of the steel bar to be processed; until the front end of the steel bar passes through the tensioning end clamping assembly 4, at this time, the front and rear ends of the steel bar are respectively located at the tensioning end clamping assembly 4 and the fixed end clamping assembly 2, and then the two groups of clamping assemblies perform a clamping action to clamp the two ends of the steel bar, and then the tensioning end clamping assembly 4 moves to realize the pre-tensioning processing of the steel bar; after the pre-tensioning is completed, the two groups of clamping assemblies release the steel bar, and under the conveying action of the middle connecting conveying assembly 3, the steel bar continues to be conveyed forward to the rear transition conveying assembly 5, and the rear transition conveying assembly 5 provides conveying power to convey the pre-tensioned steel bar to the downstream equipment of the steel bar processing line. In this way, the present device can continuously perform the pre-tensioning processing of the steel bar, and at the same time seamlessly connect to the existing steel bar processing line, greatly improving the production and processing efficiency. Of course, according to actual needs, the steel bar can also enter the present device from the rear transition conveying assembly 5 end, and output the present device from the front transition conveying assembly 1 end, which can also complete the pre-tensioning processing of the steel bar.

[0019] The following is an introduction to each component in this device.

[0020] like Figure 2 As shown, the front transition conveying assembly 1 has the same structure as the rear transition conveying assembly 5, and both are composed of a conveying frame 11 welded from I-beams, and three conveying rollers 12 arranged on the conveying frame 11, wherein the front and rear conveying rollers are directly driven by a reduction motor 13, and the middle one is an unpowered conveying roller. Five grooves 121 are provided on the three conveying rollers 12, which are used to convey five steel bars at the same time and maintain the stability of the position of each steel bar. Of course, according to actual needs, the length of the conveying roller can be selected, and the required number of grooves can be provided on the conveying roller to achieve the synchronous conveying of a larger number of steel bars. Similarly, in the following introduction to other components, the simultaneous processing of five steel bars is taken as an example, which does not mean that this embodiment is limited to the simultaneous processing of five steel bars.

[0021] like Figure 3-10As shown, the fixed end clamping assembly 2 includes a fixed base and a clamping device arranged on the fixed base, wherein the fixed base includes a mounting bracket 22 above the supporting platform 21 in addition to the supporting platform 21 at the bottom, and the clamping device is connected to the supporting platform 21 and the mounting bracket 22. Two transition rollers 23 are also arranged at the part of the fixed base close to the front transition conveying assembly 1, which are mainly used to provide support and guidance for the steel bars to ensure that the steel bars can accurately enter the clamping device.

[0022] The clamping device includes a clamping mounting seat 241, a clamping seat 242, a clamping slider 243, a hollow connecting column 244, a clamping drive device 245, and an elastic reset member 246. The description is made with the side close to the front transition conveying assembly 1 as the rear, and the side close to the middle connecting conveying assembly 3 as the front. Among them, the clamping mounting seat 241 is slidably connected to the support platform 21 through a linear guide rail, and a clamping drive device 245 is provided between the clamping mounting seat 241 and the part of the mounting bracket 22 close to the rear. The clamping drive device 245 can specifically adopt a clamping hydraulic oil cylinder. A clamping hydraulic oil cylinder is respectively provided at the left and right ends of the clamping mounting seat 241, and the two clamping hydraulic oil cylinders jointly push the clamping mounting seat 241 to move forward along the linear guide rail. The clamping mounting seat 241 has five clamping seats 242 arranged side by side, each of which is provided with a wedge-shaped opening 2421 and a connecting hole 2422. The wedge-shaped opening 2421 faces the rear, and specifically, the narrower end of the wedge-shaped opening 2421 is close to the rear; the connecting hole 2422 is located at the front of the clamping seat 242 and is connected with the wedge-shaped opening 2421. The two clamping sliders 243 are respectively slidably connected to the upper and lower opposite inclined surfaces of the wedge-shaped opening 2421, that is, when the two clamping sliders 243 slide along the inclined surface to the narrower end, the two realize the clamping action towards each other. One end of the hollow connecting column 244 is fixed to the part of the mounting bracket 22 near the front, and the other end is slidably connected to the connecting hole 2422; the elastic reset member 246 can specifically adopt a tension spring, connecting the clamping slider 243 and the part of the clamping seat 242 near the front, so as to pull the clamping slider 243 toward one side of the hollow connecting column 244, and always maintain the interference relationship between the clamping slider 243 and the end of the hollow connecting column 244. Thus, the working principle of the clamping device is as follows: the clamping hydraulic cylinder pushes the clamping mounting seat 241 forward, and the five clamping seats 242 mounted on the clamping mounting seat 241 move forward synchronously. Since the position of the hollow connecting column 244 is fixed, and the clamping slider 243 always maintains a relationship of abutment with the end of the hollow connecting column 244, the position of the clamping slider 243 in the horizontal direction remains unchanged. Therefore, when the clamping seat 242 moves forward, the clamping slider 243 moves backward relative to the clamping seat 242, that is, the two clamping sliders 243 move along the inclined surface toward the narrower end of the wedge-shaped opening 2421, and the two move toward each other to achieve the clamping action. When the clamping seat 242 is reset, due to the presence of the tension spring, the clamping slider 243 still abuts against the hollow connecting column 244, and the two clamping sliders 243 move forward relative to the clamping seat 242 to achieve the separation action of the two sliders. Therefore, the clamping device can synchronously complete the actions of five clamping mechanisms through the actions of a group of clamping hydraulic cylinders, and can ensure that the actions and clamping forces of the five clamping mechanisms are consistent, thereby ensuring processing quality.

[0023] Specifically, a ball head floating joint 247 is provided on the clamping mounting seat 241, and a force sensor 248 is provided on the ball head floating joint 247. The force sensor 248 is connected to the clamping hydraulic cylinder, that is, the tensioning force is accurately controlled by the force sensor 248, and the ball head floating joint 247 can effectively ensure the measurement accuracy of the force sensor.

[0024] In order to realize the movement of the clamping slider 243 along the inner inclined surface of the wedge-shaped opening 2421, side blocks 249 are fixedly connected to the clamping seat 242 on both sides by bolts, and the side blocks 249 are provided with a limiting bar 2491 extending into the wedge-shaped opening 2421, and a limiting slide groove is formed between the limiting bar 2491 and the inclined surface of the wedge-shaped opening 2421, and limiting slides 2431 matching the limiting slide groove are provided on both sides of the clamping slider 243. Therefore, the clamping slider 243 is stably limited on the inclined surface in the wedge-shaped opening by the limiting bar.

[0025] In order to make the clamping and separation actions of the two clamping sliders 243 more stable, a guide groove 2441 is provided along the up and down directions at one end of the hollow connecting column 244 that abuts against the clamping slider 243, and a guide slider 2432 matching the guide groove 2441 is provided on the clamping slider 243, so that the clamping slider 243 can move stably up and down along the guide groove 2441.

[0026] In order to control the clamping force of the clamping slider 243 on the steel bar, it is necessary to limit the moving range of the clamping seat 242 relative to the hollow connecting column 244. Therefore, limiting grooves 2442 are set along the length direction on the left and right sides of the hollow connecting column 244. The clamping seat 242 is provided with a limiting bolt 2410 extending into the limiting groove 2442. The moving range of the limiting bolt 2410 in the limiting groove 2442 is used to limit the moving range of the clamping seat. At the same time, the limiting structure is easy to disassemble and assemble.

[0027] Since the clamping device fixes the steel bar by clamping the side of the steel bar, in order to ensure the stability of the clamping position, a clamping groove 2433 is provided along the length direction on the clamping surface of the clamping slider 243, and a friction pattern 2434 is provided along the width direction in the clamping groove 2433, so that the clamping groove 2433 is used to increase the contact area with the steel bar to increase the friction force, and the friction pattern 2434 is used to further increase the friction force and improve the stability of clamping. Considering the wear of the friction pattern during work, it needs to be replaced regularly, so the clamping slider 243 includes a slider seat 24301 and a clamping block 24302 that are detachably connected to each other, and the clamping groove 2433 is provided on the clamping block 24302. In this way, when the friction pattern is worn, only the clamping block 20302 needs to be replaced, without replacing the entire clamping slider, thereby reducing costs. The specific disassembly and assembly structure is as follows: a slot 243011 is provided in the slider seat 24301, a block 243021 matching the slot 243011 is provided on the clamping block 24302, and a locking handle 24303 that is inwardly in contact with the clamping block 24302 is threadedly connected to the side of the slider seat 24301; since the friction force between the clamping slider and the steel bar is along the length direction of the steel bar, the main relative force between the clamping block 24302 and the slider seat 24301 is also along this direction, so the cooperation between the block and the slot is used to ensure that the positions of the two in this direction are relatively stable; the locking handle 24303 only plays an auxiliary fixing role to prevent the clamping block from falling out of the slider seat, so the locking handle only needs to be in contact with the side of the clamping block to achieve locking, and the locking handle will not be subjected to a large force from the steel bar.

[0028] like Fig.11 As shown, the tensioning end clamping assembly 4 includes a sliding base 41, a trolley 42 sliding on the sliding base 41, a tensioning drive device 43 arranged between the trolley 42 and the sliding base 41, and a clamping device arranged on the trolley 42. Among them, the clamping device of the tensioning end clamping assembly 4 has the same structure as the clamping device of the fixed end clamping assembly 2. The trolley 42 has a similar structure to the fixed seat and is used to install the same clamping device. A transition roller is also provided. The directions of the main structures of the two sets of clamping assemblies are symmetrical. In addition to clamping the steel bars, the tensioning end clamping assembly 4 also needs to bear the responsibility of tensioning the steel bars. Therefore, the movement of the trolley 42 along the sliding base 41 is used to realize the tensioning action of the steel bars. Specifically, the trolley 42 is connected to the sliding base 41 through a linear guide rail, and a tensioning drive device 43 is provided between the left and right ends of the trolley 42 and the sliding base 41. The tensioning drive device 43 adopts a tensioning hydraulic cylinder, which has a greater thrust and a longer stroke, and is controlled by an electro-hydraulic servo system to accurately control the thrust and stroke to ensure the reliability of tensioning.

[0029] like Fig.12As shown, in order to ensure that the tensioning is carried out after all five steel bars are in place and to ensure the stability of the tensioning quality, a lifting and blocking mechanism can be set on the outlet side of the tensioning end clamping assembly 4. The lifting and blocking mechanism can be driven by a lifting cylinder, and a baffle 6 is set on the upper end of the lifting cylinder to block the steel bars. That is, when all five steel bars are against the baffle 6, the clamping and tensioning actions are carried out. The lifting and lowering structure of the baffle will not affect the normal transportation of the steel bars. Of course, the lifting and blocking mechanism can also be set on the inlet side of the fixed end clamping assembly to meet the blocking requirements when the steel bars are transported in the reverse direction.

[0030] The middle connecting conveying assembly 3 is mainly connected to the fixed end clamping assembly 2 and the tensioning end clamping assembly 4 through four I-beams. When relative tension is achieved, the force is offset. At the same time, multiple driving rollers and unpowered rollers are provided to convey the steel bars.

[0031] The above is only a preferred specific embodiment of the present invention, which is an implementation method based on the overall concept of the present invention, and the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by any technician familiar with the technical field within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A pre-tensioning device for a wedge-shaped clamping device, characterized in that: It includes a front transition conveying assembly, a fixed end clamping assembly, an intermediate connecting conveying assembly, a tensioning end clamping assembly, and a rear transition conveying assembly which are sequentially arranged along a straight line; The fixed end clamping assembly comprises a fixed base and a clamping device arranged on the fixed base; The tensioning end clamping assembly comprises a sliding base, a trolley sliding on the sliding base, a tensioning driving device arranged between the trolley and the sliding base, and a clamping device arranged on the trolley; The clamping device includes a clamping seat, a clamping slider, a hollow connecting column, a clamping drive device, and an elastic reset member. A wedge-shaped opening and a connecting hole are provided in the clamping seat, and two clamping sliders are respectively slidably connected to two opposite inclined surfaces of the wedge-shaped opening; one end of the hollow connecting column is fixedly arranged, and the other end is slidably connected to the connecting hole; the elastic reset member connects the clamping seat and the clamping slider to maintain the interference relationship between the clamping slider and the end of the hollow connecting column; one end of the clamping drive device is fixedly arranged, and the other end is connected to the clamping seat to drive the clamping seat to move along the hollow connecting column, and the hollow connecting column pushes the two clamping sliders to the narrower end of the wedge-shaped opening to realize the clamping action towards each other.

2. A pre-tensioning device of a wedge-shaped clamping device according to claim 1, characterized in that: The clamping device comprises a clamping mounting seat and a plurality of clamping seats, wherein the plurality of clamping seats are arranged side by side on the clamping mounting seat, and the clamping driving device drives the clamping mounting seat to move.

3. A pre-tensioning device of a wedge-shaped clamping device according to claim 2, characterized in that: The clamping mounting seat is provided with a ball head floating joint, the ball head floating joint is provided with a force sensor, and the force sensor is connected with the clamping driving device.

4. A pre-tensioning device of a wedge-shaped clamping device according to claim 1, characterized in that: Side blocks are provided on both sides of the clamping seat, and limiting strips extending into the wedge-shaped opening are provided on the side blocks. A limiting slide groove is formed between the limiting strip and the inclined surface of the wedge-shaped opening, and limiting slide bars matching the limiting slide groove are provided on both sides of the clamping slider.

5. A pre-tensioning device of a wedge-shaped clamping device according to claim 1, characterized in that: A guide slot is provided at one end of the hollow connecting column that abuts against the clamping slider, and a guide slider matching the guide slot is provided on the clamping slider.

6. A pre-tensioning device of a wedge-shaped clamping device according to claim 1, characterized in that: A limiting groove is provided on the side of the hollow connecting column, and a limiting bolt extending into the limiting groove is provided on the clamping seat.

7. A pre-tensioning device of a wedge-shaped clamping device according to claim 1, characterized in that: A clamping groove is provided on the clamping surface of the clamping slide block, and friction lines are provided in the clamping groove.

8. A pre-tensioning device of a wedge-shaped clamping device according to claim 7, characterized in that: The clamping slide block comprises a slide block seat and a clamping block which are detachably connected to each other, and the clamping groove is arranged on the clamping block.

9. A pre-tensioning device of a wedge-shaped clamping device according to claim 8, characterized in that: A clamping groove is arranged in the slider seat, a clamping block matching the clamping groove is arranged on the clamping block, and a locking handle which is inwardly abutted against the clamping block is threadedly connected to the side surface of the slider seat.

10. A pre-tensioning device of a wedge-shaped clamping device according to claim 1, characterized in that: At least one of the opposite sides of the fixed end clamping assembly and the tension end clamping assembly is provided with a lifting and lowering blocking mechanism.

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