A clamping mechanism of a sheet metal bending machine

Abstract

The utility model discloses a kind of clamping mechanisms of sheet metal bending machine, including installation crossbeam, floating head unit and locking device, installation crossbeam is fixedly installed on the body of bending machine;Floating head unit is at least two, the floating head unit is parallelly arranged along the length direction of the installation crossbeam, including shell, pressing block and pre-press spring, the shell is fixed on the installation crossbeam, the pressing block can slide up and down in the shell, the bottom end of the pressing block projects the shell, the pre-press spring is connected between the pressing block and the shell, provides initial pressure downward for the pressing block;Locking device is set on the installation crossbeam, for after the pressing block is pressed tightly sheet metal part and moves to predetermined position, the pressing block is locked and fixed.

Description

Technical Field

[0001] This utility model relates to the field of sheet metal processing equipment technology, specifically to a clamping mechanism for a sheet metal bending machine. Background Technology

[0002] In sheet metal bending, the clamping mechanism is used to stably press the sheet metal part onto the lower die before the bending process. Its specific functions are as follows: 1. Reduce deformation: Large sheet metal parts are prone to sagging or twisting deformation when bent due to insufficient rigidity. By using a special pressing device or support fixture to clamp the workpiece, the material flow can be restricted and the stress can be distributed to avoid local stress concentration. 2. Improved precision: The bending die and the pressure device work together to accurately position the workpiece and maintain stable pressure, ensuring the accuracy of bending angle and dimensions; 3. Auxiliary positioning: Some processes require maintaining a compacted state before the adhesive cures. For example, when applying sheet metal adhesive, it is necessary to press it firmly with fingers or tools to remove air bubbles and ensure that the adhesive fully penetrates.

[0003] Existing clamping mechanisms (usually called pressure plates or pressure beams) mostly adopt an integral structure, driven by hydraulic or pneumatic pressure to press down as a whole. This structure has the following drawbacks: Poor adaptability: When the sheet metal part to be bent has pre-formed protrusions, depressions or irregular structures, the integral clamping plate cannot effectively avoid these structures, resulting in insufficient clamping or damage to the surface of the workpiece.

[0004] Uneven pressure: For long workpieces, the overall pressure beam may have inconsistent pressure at both ends and in the middle due to its own rigidity or drive synchronization issues, which affects the clamping effect.

[0005] Limited functionality: Traditional clamping mechanisms only have a clamping function. For thin plates or large plates, there is a lack of effective auxiliary positioning function before clamping. They rely on manual alignment by the operator, which is inefficient and difficult to guarantee accuracy. Utility Model Content

[0006] In view of the shortcomings of the existing technology, the technical problem to be solved by this utility model is to provide a clamping mechanism for a sheet metal bending machine that can adapt to the surface shape of the workpiece to achieve uniform clamping, thereby improving the bending effect of sheet metal parts.

[0007] To achieve the above objectives, this utility model provides the following technical solution: a clamping mechanism for a sheet metal bending machine, comprising: Install the crossbeam and fix it to the body of the bending machine; At least two floating pressure head units are arranged side-by-side along the length of the mounting beam. Each unit includes a housing, a pressure block, and a preload spring. The housing is fixed to the mounting beam. The pressure block can slide up and down within the housing, with its bottom end extending out of the housing. The preload spring connects the pressure block and the housing, providing an initial downward pressure to the pressure block. A locking device is provided on the mounting beam for locking and fixing the pressure block after the pressure block presses the sheet metal part and moves to a predetermined position.

[0008] Furthermore, the locking device includes a mounting rod, a lever, a stop plate, and a fixing structure. The mounting rod is arranged along the length of the mounting beam. The stop plate has a through hole, and the stop plate is slidably fitted onto the mounting rod through the through hole. The lever is hinged to the mounting beam, and one end of the lever is a power arm, the end of which is slidably connected to the stop plate. The other end is a resistance arm, the end of which acts on the upper surface of the pressure block. The fixing structure is used to fix all the stop plates onto the mounting rod.

[0009] Furthermore, the length of the resistance arm of the lever is less than the length of the power arm.

[0010] Furthermore, the end of the resistance arm is connected to the upper surface of the pressure block via a first rolling element.

[0011] Furthermore, the abutment plate is provided with a vertically extending groove, and the end of the power arm is hinged to a slider, which is slidably engaged in the groove.

[0012] Furthermore, a second rolling element is provided between the slider and the groove.

[0013] Furthermore, the fixing structure includes an inflation device and multiple airbags. Each of the perforations in the abutment is provided with one airbag. The inflation device is connected to all the airbags through an air tube and is used to inflate all the airbags so that the airbags grip the mounting rod.

[0014] The beneficial effects of this utility model are: The clamping mechanism of the above-mentioned sheet metal bending machine has at least the following advantages: By employing at least two floating pressure head units arranged side-by-side along the length of the mounting beam, each unit containing an independently sliding pressure block and a preload spring providing initial pressure, this mechanism allows each pressure block to independently float and adjust its position according to the actual height of the workpiece surface below it during the clamping process. This ensures that all pressure blocks can simultaneously adhere to the workpiece even with uneven surfaces, guaranteeing a uniform distribution of clamping force along the bending line. This effectively avoids localized "false pressure" and stress concentration, significantly improving the clamping effect and processing quality, thereby enhancing the bending effect. Attached Figure Description

[0015] To more clearly illustrate the specific embodiments of this utility model, the accompanying drawings used in the specific embodiments will be briefly described below. In all the drawings, the elements or parts are not necessarily drawn to scale.

[0016] Figure 1 A schematic diagram of a clamping mechanism for a sheet metal bending machine provided in an embodiment of this utility model; Figure 2 for Figure 1 A schematic diagram of the floating pressure head unit and locking device in the clamping mechanism of the sheet metal bending machine shown; Figure 3 for Figure 1 The diagram shows the upward movement of the pressure block in the clamping mechanism of the sheet metal bending machine. Figure label: 1. Body; 2. Sheet metal; 100. Mounting beam; 200. Floating pressure head unit; 210. Housing; 220. Pressure block; 230. Preload spring; 300. Locking device; 310. Mounting rod; 320. Lever; 330. Support plate; 340. Fixing structure; 341. Inflation device; 342. Airbag; 343. Air tube; 350. First rolling element; 360. Slider. Detailed Implementation

[0017] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the invention; therefore, the invention is not limited to the specific embodiments disclosed below.

[0018] Please see Figures 1 to 3 This utility model provides a clamping mechanism for a sheet metal bending machine, including a mounting beam 100, multiple floating pressure head units 200, and a locking device 300.

[0019] Specifically, the mounting beam 100, serving as the foundational load-bearing and mounting component of the entire mechanism, is fixedly mounted on the body 1 of the bending machine. At least two floating pressure head units 200 are provided, arranged side-by-side along the length of the mounting beam 100, forming a clamping line. Each floating pressure head unit 200 includes a housing 210, a pressure block 220, and a preload spring 230. The housing 210 is rigidly fixed to the mounting beam 100; the pressure block 220 is slidably disposed inside the housing 210, with its bottom end extending out of the housing 210 to directly contact the sheet metal workpiece; the preload spring 230 connects the pressure block 220 and the housing 210, providing a continuous downward initial pressure to the pressure block 220.

[0020] During use, as the mounting beam 100 descends during clamping, the preload spring 230 pushes the pressure block 220 downwards, ensuring it remains in contact with the workpiece surface, either initially or when encountering uneven workpieces. This allows each pressure head unit to adapt to local height changes in the workpiece below, ensuring uniform pressure distribution and preventing ineffective or insufficient pressure.

[0021] The locking device 300 is mounted on the mounting beam 100. When the pressure blocks 220 of all floating pressure head units 200 press the two sheet metal parts under the action of the preload spring 230, and adaptively move to their respective final "predetermined positions" as the workpiece undergoes slight deformation or positioning, the device can be activated to mechanically lock and fix the positions of all pressure blocks 220.

[0022] Specifically, the locking device 300 includes a mounting rod 310, a lever 320, a stop plate 330, and a fixing structure 340. The mounting rod 310 is arranged along the length of the mounting beam 100. The stop plate 330 has a through hole, through which it can be slidably fitted onto the mounting rod 310. The lever 320 is hinged to the mounting beam 100, and one end of the lever 320 is a power arm, the end of which is slidably connected to the stop plate 330. The other end is a resistance arm, the end of which acts on the upper surface of the pressure block 220. The fixing structure 340 is used to fix all the stop plates 330 onto the mounting rod 310.

[0023] When the pressure block 220 presses the workpiece, its position determines the height of the resistance arm of the lever 320. At this point, if all the abutments 330 are locked to the mounting rod 310 via the fixing structure 340, the height of the abutments 330 is fixed. Since the end of the lever 320's power arm is slidably connected to the abutment 330, the fixing of the abutment 330 means that the relative position of the fulcrum (hinge point) of the lever 320 and the end of the power arm is determined. According to the lever 320 principle, the position of the entire lever 320 (including its resistance arm) is locked. Therefore, the end of the resistance arm cannot move upwards, thus "locking" the pressure block 220 below it in its current position, achieving mechanical locking. Loosening the fixing structure 340 releases the lock.

[0024] Furthermore, the length of the resistance arm of lever 320 is shorter than the length of the effort arm. This constitutes a force-saving lever. During the locking process, when the workpiece or mechanism has a slight tendency to displace and attempt to push up the pressure block 220 and the resistance arm, because the effort arm is longer, the upward force transmitted to the end of the effort arm becomes very small. This allows the fixing structure 340 to overcome this reaction force with only a small locking force, achieving effective self-locking. This not only reduces the requirements for the locking elements but also improves the reliability and sensitivity of the locking mechanism.

[0025] Furthermore, a first rolling element 350 is provided between the end of the resistance arm of the lever 320 and the upper surface of the pressure block 220. This first rolling element 350 is either an embedded needle roller bearing or a freely rotating roller. The first rolling element 350 transforms the sliding friction between the resistance arm of the lever 320 and the pressure block 220 into rolling friction. This minimizes the frictional resistance from the lever 320 during the adaptive floating process of the pressure block 220 to find the pressing position, ensuring the sensitivity and accuracy of the floating pressing. Simultaneously, in the locked state, the rolling element becomes a line contact or point contact, resulting in stress concentration, which more effectively "bites" the pressure block 220, enhancing the locking effect.

[0026] Meanwhile, a vertically extending groove is formed on the abutment plate 330; a slider 360 is hinged to the end of the lever 320's power arm, and the slider 360 slides and engages within the groove. The cooperation between the groove and the slider 360 allows the end of the lever 320's power arm to move freely in the vertical direction during operation, which is necessary for the lever 320 to transmit force and adapt to different clamping heights; on the other hand, it restricts other degrees of freedom of this end in the horizontal plane, ensuring the stability of power transmission, preventing the lever 320 from twisting or misaligning, and making the transmission of locking force more precise and reliable.

[0027] Subsequently, a second rolling element is provided between the contact surface of the slider 360 and the groove. This second rolling element can be multiple balls embedded in the side of the slider 360, forming a linear bearing-type structure.

[0028] The second rolling element further transforms the sliding friction between the slider 360 and the groove into rolling friction. This greatly reduces the frictional force at the end of the lever 320 power arm during up-and-down movement, making the entire locking device 300 operate more smoothly, easily, and quickly, while also reducing wear on parts and extending its service life.

[0029] In this embodiment, the fixing structure 340 includes an inflation device 341 and multiple airbags 342. An annular airbag 342 is embedded in the inner wall of the perforation of each abutment 330. The inflation device 341 is connected to all the airbags 342 via air tubes 343. The inflation device 341 can be a manual air pump or an electric air pump.

[0030] When locking is required, the inflation device 341 is activated, simultaneously inflating all airbags 342 with compressed gas. After inflating, the inner walls of the airbags 342 tightly grip the mounting rod 310, using the immense static friction to instantly fix the abutment 330 in its current position. When loosening is required, simply release the gas from the airbags 342; the airbags 342 contract, separating from the mounting rod 310, allowing the abutment 330 to resume free sliding.

[0031] In this way, the locking and unlocking of all the pressure plates 330 can be controlled simultaneously by a single inflation device 341, with uniform movements, ensuring that all the pressure blocks 220 are locked in sync.

[0032] The specific usage method of the above clamping mechanism is as follows: Step 1: Initial preparation and workpiece placement: Confirm that the locking device 300 is in the released state. That is, the inflation device 341 in the fixed structure 340 is not activated, and the airbag 342 is in an uninflated contracted state, allowing all the abutments 330 to slide freely on the mounting rod 310. At this time, the pressure blocks 220 of all floating pressure head units 200 are at the lower limit of their stroke under the push of their respective preload springs 230.

[0033] Step 2: Perform floating clamping and initial positioning The entire mounting beam 100 and all the floating pressure head units 200 on it are driven downward by the control system (or manually) of the bending machine until the bottom ends of all the pressure blocks 220 contact the surface of the sheet metal 2 workpiece and apply pressure.

[0034] Step 3: Activate the locking device 300 to fix the pressure block 220 in position. Once it is confirmed that all pressure blocks 220 have stably clamped the workpiece, the fixing structure 340 of the locking device 300 is activated. Specifically, the inflation device 341 is operated to simultaneously inflate compressed gas (such as air) into all the airbags 342 set in the perforations of the bottom plate 330.

[0035] Step 4: Perform bending processing With the clamping mechanism locked, the upper die (bending knife) of the bending machine moves downward according to the program to perform bending operations on the sheet metal workpiece.

[0036] Step 5: Loosen the lock and reset. After bending is completed, the upper die of the bending machine returns to its original position. Then, the inflation device 341 is operated to release the compressed gas in the airbag 342, causing the airbag 342 to contract and disengage from the mounting rod 310.

[0037] Finally, the drive mounting beam 100 moves upward as a whole, returning to its initial height. During this process, each pressure block 220 also rises under the restoring force of the preload spring 230, or may be pushed upward by the workpiece surface. Eventually, all pressure blocks 220 return to the lower limit of their stroke under the action of the preload spring 230, completing a full work cycle and preparing for the next processing.

[0038] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model, and they should all be covered within the scope of the claims and specification of this utility model.

Claims

1. A clamping mechanism for a sheet metal bending machine, characterized in that, include: Install the crossbeam and fix it to the body of the bending machine; At least two floating pressure head units are arranged side by side along the length of the mounting beam. Each floating pressure head unit includes a housing, a pressure block, and a preload spring. The housing is fixed to the mounting beam. The pressure block can slide up and down inside the housing. The bottom end of the pressure block extends out of the housing. The preload spring is connected between the pressure block and the housing to provide an initial downward pressure to the pressure block. and A locking device is provided on the mounting beam for locking and fixing the pressure block after the pressure block presses the sheet metal part and moves to a predetermined position.

2. The clamping mechanism of the sheet metal bending machine according to claim 1, characterized in that, The locking device includes a mounting rod, a lever, a stop plate, and a fixing structure. The mounting rod is arranged along the length of the mounting beam. The stop plate has a through hole, and the stop plate can be slidably fitted onto the mounting rod through the through hole. The lever is hinged to the mounting beam, and one end of the lever is a power arm, the end of which is slidably connected to the stop plate. The other end is a resistance arm, the end of which acts on the upper surface of the pressure block. The fixing structure is used to fix all the stop plates onto the mounting rod.

3. The clamping mechanism of the sheet metal bending machine according to claim 2, characterized in that, The length of the resistance arm of the lever is less than the length of the power arm.

4. The clamping mechanism of the sheet metal bending machine according to claim 2, characterized in that, The end of the resistance arm is connected to the upper surface of the pressure block via a first rolling element.

5. The clamping mechanism of the sheet metal bending machine according to claim 2, characterized in that, The support plate has a vertically extending groove, and the end of the power arm is hinged to a slider, which is slidably engaged in the groove.

6. The clamping mechanism of the sheet metal bending machine according to claim 5, characterized in that, A second rolling element is provided between the slider and the groove.

7. The clamping mechanism of the sheet metal bending machine according to claim 6, characterized in that, The fixing structure includes an inflation device and multiple airbags. Each airbag is disposed in the perforation of each abutment. The inflation device is connected to all the airbags through an air tube and is used to inflate all the airbags so that the airbags hug the mounting rod.

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