A multi-segment bending clamp

Abstract

This invention relates to a multi-segment bending clamp, comprising a reference block, a front jaw, a limiting plate, several bending blades, a vibration-damping elastic element, a main locking assembly, and a gap-reinforcing assembly. The front jaw spans and is fixed to several clamping parts along a first direction. The reference block is located on the rear side of the front jaw, and the upper ends of each bending blade are slidably connected between the reference block and the front jaw along the first direction, arranged at a preset interval. The limiting plate is detachably installed on the front surface of the front jaw and has a locking jaw for engaging the gap between the bending blades. The vibration-damping elastic element is located between the reference block and the front jaw and is in a compressed state. The main locking assembly passes through the reference block and the front jaw along a second direction to detachably lock and fix the two together, and the upper ends of each bending blade are clamped and fixed along the second direction by the lower ends of the reference block and the front jaw. The gap-reinforcing assembly is installed on the front jaw and is linked with the main locking assembly.

Description

Technical Field

[0001] This invention relates to the bending process of sheet metal parts, and more particularly to a multi-segment bending clamp. Background Technology

[0002] In the sheet metal processing industry, bending is widely used in the forming of various metal sheets. Bending requires a bending machine and its matching bending cutters. Generally, the flat sheet is deformed by the preset angle of the upper and lower bending cutters. The production of a single bend is basically completed by one bending cutter and one bending die.

[0003] If there are features that must be completed before bending, such as riveting features, protrusions, or other avoidance features that need to be completed before bending, the bending cutter needs to be divided into two sections to avoid interference. Similarly, if a product has ten or even more avoidance features, the bending cutter needs to be divided into more than ten sections, or a dedicated bending cutter needs to be made. This situation is most common on the guide rail brackets of insert boxes.

[0004] The current problem is: (1) If it is divided into more than ten sections, there will be a gap between the clamping parts of the common bending machine clamping head on the market. This gap cannot be used to install bending cutters, and multiple narrow bending cutters cannot be properly installed and arranged. (2) If special tools are made, one tool must be made for each product and cannot be used for other products, resulting in a large inventory of tools, high purchase costs, and time-consuming tool replacement and debugging. Summary of the Invention

[0005] The present invention aims to provide a multi-segment bending clamp structure that is compatible with different sized clearances, facilitates adjustment of the bending blade spacing, and can resist bending vibration and maintain stability after fastening.

[0006] The present invention provides a multi-segment bending clamp, comprising a reference block, a front clamp, a limiting plate, a plurality of discrete bending blades, and an adjusting and locking mechanism. The front gripper is an integral component that extends along a first direction to at least two clamping parts that cross the bending machine clamping head. The front gripper is fixedly connected to each of the clamping parts. The reference block is located on the rear side of the front gripper, and the upper ends of each of the bending blades are slidably connected between the reference block and the front gripper along the first direction and arranged at a preset interval. The limiting plate is detachably installed on the front surface of the front gripper and is provided with grippers that extend backward and engage with the spacing between each of the bending blades to limit the relative displacement of each of the bending blades along the first direction. The limiting plate is configured as one of a number of standard parts with selectable gripper spacing. The gripper spacing of each standard part is adapted to the clearance position of the required bending product. The assembly interface of each standard part with different specifications is the same as that of the front gripper. The adjusting locking mechanism includes a vibration-damping elastic element, a main locking assembly, and a gap reinforcement assembly; The vibration-damping elastic element is disposed between the reference block and the front gripper and is in a compressed state; The main locking assembly is inserted between the reference block and the front jaw along the second direction to lock and fix the two detachably. The upper end of each of the bending blades is clamped and fixed by the lower end of the reference block and the front jaw along the second direction. The first direction is perpendicular to the second direction. The gap reinforcement component is mounted on the front jaw and is linked with the main locking component. The gap reinforcement component has a pressing part that abuts against the clamping part, which is used to further press the lower end of the front jaw after the main locking component is tightened. When the main locking component and the gap reinforcement component release the locking effect on the bending knife, the bending knife can move along the first direction to adjust the gap.

[0007] Furthermore, the main locking component includes a first fastener, which is threadedly connected to the middle of the reference block and the front jaw along the second direction and is located below the gap reinforcement component. The first fastener serves as a prying fulcrum for the lower end of the gap reinforcement component and the front jaw.

[0008] Furthermore, the first fastener has multiple components, and each of the first fasteners is arranged at equal intervals along the first direction.

[0009] Furthermore, the lower end of the front gripper is provided with a first groove extending in a first direction, and a connecting rod is placed in the groove. The upper end of each of the bending blades is provided with a second groove. The front and rear sides of the connecting rod are respectively engaged in the first groove and the second groove of each of the bending blades. The connecting rod is locked and fixed to the front gripper by a second fastener.

[0010] Furthermore, the vibration-damping elastic element includes at least a first spring and a second spring. The first spring is sleeved on the first fastener, with its two ends abutting against the reference block and the front clamping jaw, respectively. The second spring is adjacent to each of the second fasteners and is clamped between the connecting rod and the front clamping jaw.

[0011] Furthermore, the gap reinforcement assembly includes a wrench rotatably connected to the upper end of the front jaw. The front end of the wrench has an eccentric arc-shaped protrusion as the clamping part. The eccentric arc-shaped protrusion abuts against the clamping parts. The eccentric arc-shaped protrusion is used to cooperate with the prying fulcrum and the connecting rod to form an elastically pressing lever mechanism.

[0012] Furthermore, the part of the clamping component used to engage with the eccentric arc-shaped protrusion has a cylindrical protrusion.

[0013] Furthermore, it also includes a rear gripper and a third fastener. The rear gripper is located on the rear side of the reference block, and the third fastener passes through the reference block and fixes the front gripper and the rear gripper relative to each other. The vibration-damping elastic element includes a third spring, which is sleeved on the third fastener and has its two ends abutting against the rear gripper and the reference block, respectively. The first spring and the third spring are set at the same height.

[0014] Furthermore, it includes a stop block, which is disposed above the reference block, with its bottom abutting against the reference block, and is fixedly connected to the clamping component.

[0015] Furthermore, the limiting plate includes a plate body and a plurality of claws disposed on the rear side of the plate body. The width of each claw is consistent with the preset distance between the corresponding bending blades. The two are adapted to fit together along the second direction. The front surface of the front claw is provided with a first assembly interface. The limiting plate is provided with a second assembly interface adapted to the first assembly interface. The limiting plate is detachably fixed to the front surface of the front claw by a fourth fastener in conjunction with the first assembly interface and the second assembly interface.

[0016] Compared with the prior art, the multi-segment bending clamp of the present invention has the following advantages: (1) By setting the front chuck as an integral component spanning at least two clamping parts, the gap in the middle of the original chuck is eliminated, and multiple narrow bending tools can be installed and arranged, which is suitable for products with different sizes of clearance, thereby reducing the cost of purchasing special tools, reducing the tool changing and debugging time, and realizing one mold for multiple uses. (2) The bending knife can slide freely between the reference block and the front jaw in the first direction, and the bending knife spacing can be moved flexibly and conveniently. At the same time, the limit plate adopts a standardized design with selectable jaw spacing, is externally mounted on the front jaw, and the assembly interface of different standard parts is the same. Therefore, it is only necessary to replace the limit plate that is suitable for the current product's avoidance position to complete the locking. The operation is convenient and improves the switching efficiency when producing multiple varieties in small batches. (3) By coordinating the main locking components and the gap reinforcement components, the clamping is tightened first and then pressed. The lever principle is used to eliminate the residual gap between the front jaw and the reference block, and the bending knife is completely locked. At the same time, the anti-vibration elastic element ensures that it is always under pressure to generate a continuous pre-tightening force, which counteracts the high-frequency vibration generated by the bending operation and ensures the stability of the bending knife spacing during long-term processing.

[0017] (4) The first fasteners are arranged at equal intervals along the first direction to make the clamping force evenly distributed and prevent stress concentration in the front jaws; together with the rear jaws, springs at various locations and top stops, the overall structural rigidity and stability of the clamping head are enhanced, the stress distribution is optimized, and the high precision and high consistency of bending processing are ensured. Attached Figure Description

[0018] Figure 1 A schematic diagram of the multi-segment bending clamp of the present invention is provided.

[0019] Figure 2 A left view of the multi-segment bending clamp of the present invention is shown.

[0020] Figure 3 A front view of the multi-segment bending clamp of the present invention is given.

[0021] Figure 4 An exploded view of the multi-segment bending clamp of the present invention is provided. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of this invention clearer, the embodiments of this invention will be described in detail below with reference to the accompanying drawings. It should be noted that the embodiments described below are only for explaining this invention and are not intended to limit the scope of protection of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without inventive effort are within the scope of protection of this invention.

[0023] like Figures 1 to 4 As shown, the multi-segment bending clamping head of this embodiment includes a reference block 1, a front clamping jaw 2, a limiting plate 3, several discrete bending blades 4, and an adjusting and locking mechanism.

[0024] like Figure 1 , Figure 4 As shown, the front gripper 2 is a cast integral component. Its extension length in the first direction is greater than the total span between the two clamping parts 5 across the bending machine clamping head. During assembly, the front gripper 2 spans at least the two clamping parts 5 across the bending machine clamping head and is threadedly fixed to each clamping part 5 to realize the assembly and fixation of the multi-segment bending clamping head with the bending machine.

[0025] Reference block 1 is positioned behind front gripper 2, with the two spaced apart. For example... Figure 3 As shown, the upper ends of each bending blade 4 are slidably connected between the reference block 1 and the front gripper 2 along the first direction, that is, the direction of the front gripper 2 shaft, and are arranged at a preset spacing 41 according to the avoidance position of the processed product.

[0026] like Figure 1 , Figure 2 As shown, the limiting plate 3 is detachably mounted on the front surface of the front gripper 2. The limiting plate 3 is a plate structure bent into an L-shape. One arm 31 of the L-shape is threadedly connected and fixed to the front surface of the front gripper 2 facing the operator, and the other arm 32 extends backward, with a pawl 33 provided on its edge. The pawl 33 engages in the gap 41 between adjacent bending blades 4, restricting the displacement of the bending blades 4 in the first direction.

[0027] The limiting plate 3 itself is a standardized part with various claw 33 spacing specifications. The corresponding specification is selected according to the avoidance position of the specific bending product. The assembly interface 34 of the limiting plate 3 and the front claw 2 are the same for different specifications, which is convenient for replacement.

[0028] In this embodiment, the adjusting locking mechanism includes a vibration-damping elastic element, a main locking assembly, and a gap reinforcement assembly.

[0029] The vibration-damping elastic element is clamped between the reference block 1 and the front clamping jaw 2 and is in a compressed state. The main locking assembly passes through the reference block 1 and the front clamping jaw 2 along the second direction to detachably lock and fix the two. After locking, the upper end of each bending blade 4 is firmly clamped by the lower end of the reference block 1 and the front clamping jaw 2 along the second direction. The gap reinforcement assembly is installed on the front clamping jaw 2 and is linked with the main locking assembly. It is provided with a pressing part that abuts against the clamping part 5. After the main locking assembly is tightened, it further presses the lower end of the front clamping jaw 2. When the main locking assembly and the gap reinforcement assembly release the locking effect on the bending blade 4, the bending blade 4 can move freely along the first direction to adjust the gap.

[0030] The aforementioned multi-segment bending clamping head structure, by setting the front clamping jaw 2 as an integrated component spanning at least two clamping parts 5, eliminates the gap in the middle that prevents tool installation in the original bending machine clamping head. This allows for the installation and arrangement of multiple narrow bending blades 4, suitable for products with different size clearances, thereby reducing the cost of purchasing special tools, reducing tool change and debugging time, and achieving multi-purpose use of a single mold. Secondly, the bending blade 4 can slide freely between the reference block 1 and the front clamping jaw 2 in the first direction, flexibly and conveniently moving the spacing of the bending blade 4. At the same time, the limiting plate 3 adopts a standardized design with selectable jaw spacing, and external assembly... The front clamping jaw 2 has the same assembly interface for different standard parts. Therefore, locking can be completed simply by replacing the limit plate 3 that is adapted to the current product's clearance position. This makes operation convenient and improves the switching efficiency when producing multiple varieties in small batches. Furthermore, through the synergy of the main locking components, the gap reinforcement components, and the vibration-damping elastic elements, a double locking mechanism is achieved by first tightening and then pressing, ensuring the firm clamping of the folding and bending blade 4. At the same time, the continuously compressed elastic elements absorb vibration, effectively preventing tool distance displacement caused by high-frequency impact during bending processing, and ensuring the long-term stability of processing accuracy.

[0031] As an improvement, such as Figure 4 As shown, the main locking assembly includes a first fastener 61, which is threaded along the second direction to the middle of the reference block 1 and the front jaw 2, and is located below the gap reinforcement assembly. This allows the first fastener 61 to act as a prying fulcrum between the gap reinforcement assembly and the lower end of the front jaw 2, providing mechanical support. In actual assembly, the operator first tightens the first fastener 61 to achieve basic fastening between the reference block 1 and the front jaw 2, clamping the bending blade 4. Then, the operator moves the gap reinforcement assembly, which creates a lever effect during operation, eliminating residual gaps and further pressing the lower end of the front jaw 2. In this design, the first fastener 61 serves both as a locking mechanism and a prying fulcrum, forming a lever with the gap reinforcement assembly, resulting in an extremely secure locking effect.

[0032] Based on the above-mentioned improved scheme, preferably, multiple first fasteners 61 are provided, and each first fastener 61 is arranged at equal intervals along the first direction. The equal distribution of multiple first fasteners 61 evenly distributes the total clamping force on the front gripper 2 to the reference block 1, avoiding local stress concentration, preventing the front gripper 2 from warping under long-term load, and uniformly transmitting the locking force to the reference block 1 to ensure the consistency of the force on the front gripper 2.

[0033] Based on the above-mentioned improved scheme, as another preferred embodiment, the lower end of the front gripper 2 is provided with a first groove 21 extending in a first direction, and a connecting rod 7 is placed inside the first groove 21. The upper end of each bending blade 4 is provided with a second groove 42. The front and rear sides of the connecting rod 7 are respectively engaged in the first groove 21 and the second groove 42 of each bending blade 4, and are locked and fixed to the front gripper 2 by the second fastener 71. In actual adjustment, after the operator loosens the fasteners, the bending blade 4 can slide along the connecting rod 7 through its own second groove 42. The spacing of the bending blades 4 can be arbitrarily arranged according to the requirements by simply pushing by hand, which greatly shortens the blade adjustment time. At the same time, the connecting rod 7 acts as a constraint in the locked state to prevent the bending blades 4 from tilting laterally during the clamping process.

[0034] Furthermore, based on this, such as Figure 4 As shown, the vibration-damping elastic element includes at least a first spring 62 and a second spring 72. The first spring 62 is sleeved on the first fastener 61, with its two ends abutting against the reference block 1 and the front gripper 2, respectively. The second spring 72 is correspondingly located adjacent to each second fastener 71, clamped between the connecting rod 7 and the front gripper 2. The first spring 62 and the second spring 72 form a two-stage elastic pre-tensioning network. In the locked state, the springs are always in a compressed deformation state, generating a continuous elastic restoring force to firmly support the fasteners and connecting rod 7. When the bending machine is working, the two-stage elastic pre-tensioning network can effectively counteract the high-frequency vibration of the bending environment, ensuring the stability of the cutter distance under long-term operation.

[0035] In this embodiment, as Figure 1 , Figure 4 As shown, the gap reinforcement assembly includes a wrench 8. The wrench 8 is rotatably connected to the upper end of the front jaw 2, and its front end has an eccentric arc-shaped protrusion 81, which serves as a clamping part and abuts against the clamping component 5. During operation, after the main locking assembly is tightened, the operator turns the wrench 8. Due to the eccentric arc design, the protrusion 81 gradually presses against the clamping component 5. Combined with the prying fulcrum, this causes the clamping force to increase non-linearly, generating a sudden increase in clamping force, which firmly presses the lower end of the front jaw 2, further enhancing the stability after tightening. Furthermore, the part of the clamping component 5 that mates with the eccentric arc-shaped protrusion 81 has a cylindrical protrusion 51. The cylindrical protrusion 51 serves as the force-bearing contact surface of the eccentric arc-shaped protrusion 81, providing smooth rolling contact and reducing contact stress.

[0036] Furthermore, the clamping head also includes a rear jaw 9 and a third fastener 91. The rear jaw 9 is located behind the reference block 1, and the third fastener 91 passes through the reference block 1 and fixes the front jaw 2 relative to the rear jaw 9. The vibration-damping elastic element further includes a third spring 92, which is sleeved on the third fastener 91, with its two ends abutting against the rear jaw 9 and the reference block 1, respectively. The first spring 62 and the second spring 72 are positioned at the same height to ensure force balance.

[0037] In this design, the rear gripper 9 provides the bending blade 4 with the option of reverse installation, making the clamping head suitable for complex products with multiple discrete narrow blades as well as products with a single flat blade that does not require avoidance, thus expanding the scope of application. In addition, the third spring 92 is sleeved on the third fastener 91, providing a continuous forward elastic thrust to the rear structure. Together with the first and second springs 62 and 72, it achieves balanced pre-tensioning of the front and rear weights. Furthermore, the first spring 62 and the third spring 92 are designed at the same height to prevent the gripper from flipping under force, resulting in better overall mechanical balance.

[0038] As another improvement, such as Figure 1 As shown, the clamping head also includes a stop 52. The stop 52 is located above the reference block 1, with its bottom abutting against the reference block 1, and the stop 52 is fixedly connected to the clamping component 5. The stop 52 serves as a rigid limiting support at the top of the reference block 1, increasing the upper limit of the pressure on the bending knife 4.

[0039] As another improvement, such as Figure 4 As shown, the specific implementation of the limiting plate 3 includes a plate body and multiple claws 33 disposed on the rear side of the plate body. The width of each claw 33 is consistent with the preset distance between the corresponding bending blade 4. During assembly, the two are fitted together along the second direction to physically block the bending blade 4 in the first direction. The front surface of the front claw 2 is provided with a first assembly interface, and the limiting plate 3 is provided with a second assembly interface that matches the first assembly interface. The limiting plate 3 is detachably fixed to the front surface of the front claw 2 by a fourth fastener 35 in conjunction with the first and second assembly interfaces. When changing the limiting plate 3 of different specifications, it can be quickly inserted and pulled out and tightened as if changing a mold, which improves the efficiency of mold changing.

[0040] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although detailed descriptions have been provided with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the present invention, and all such modifications and substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A multi-segment bending clamp, characterized in that: It includes a reference block, a front gripper, a limit plate, several discrete bending blades, and an adjustment and locking mechanism; The front gripper is an integral component that extends along a first direction to at least two clamping parts that cross the bending machine clamping head. The front gripper is fixedly connected to each of the clamping parts. The reference block is located on the rear side of the front gripper, and the upper ends of each of the bending blades are slidably connected between the reference block and the front gripper along the first direction and arranged at a preset interval. The limiting plate is detachably installed on the front surface of the front gripper and is provided with grippers that extend backward and engage with the spacing between each of the bending blades to limit the relative displacement of each of the bending blades along the first direction. The limiting plate is configured as one of a number of standard parts with selectable gripper spacing. The gripper spacing of each standard part is adapted to the clearance position of the required bending product. The assembly interface of each standard part with different specifications is the same as that of the front gripper. The adjusting locking mechanism includes a vibration-damping elastic element, a main locking assembly, and a gap reinforcement assembly; The vibration-damping elastic element is disposed between the reference block and the front gripper and is in a compressed state; The main locking assembly is inserted between the reference block and the front jaw along the second direction to lock and fix the two detachably. The upper end of each of the bending blades is clamped and fixed by the lower end of the reference block and the front jaw along the second direction. The first direction is perpendicular to the second direction. The gap reinforcement component is mounted on the front jaw and is linked with the main locking component. The gap reinforcement component has a pressing part that abuts against the clamping part, which is used to further press the lower end of the front jaw after the main locking component is tightened. When the main locking component and the gap reinforcement component release the locking effect on the bending knife, the bending knife can move along the first direction to adjust the gap.

2. The multi-segment bending clamp according to claim 1, characterized in that: The main locking component includes a first fastener, which is threadedly connected to the middle of the reference block and the front jaw along the second direction and is located below the gap reinforcement component. The first fastener serves as a prying fulcrum for the lower end of the gap reinforcement component and the front jaw.

3. The multi-segment bending clamp according to claim 2, characterized in that: The first fastener has multiple fasteners, and each of the first fasteners is arranged at equal intervals along the first direction.

4. The multi-segment bending clamp according to claim 2, characterized in that: The lower end of the front gripper is provided with a first groove extending in a first direction, and a connecting rod is placed in the groove. The upper end of each of the bending blades is provided with a second groove, and the front and rear sides of the connecting rod are respectively engaged in the first groove and the second groove of each of the bending blades. The connecting rod is locked and fixed to the front gripper by a second fastener.

5. The multi-segment bending clamp according to claim 4, characterized in that: The vibration damping elastic element includes at least a first spring and a second spring. The first spring is sleeved on the first fastener, with its two ends abutting against the reference block and the front clamping jaw, respectively. The second spring is adjacent to each of the second fasteners and is clamped between the connecting rod and the front clamping jaw.

6. The multi-segment bending clamp according to claim 5, characterized in that: The gap reinforcement assembly includes a wrench rotatably connected to the upper end of the front jaw. The front end of the wrench has an eccentric arc-shaped protrusion as the clamping part. The eccentric arc-shaped protrusion abuts against the clamping parts. The eccentric arc-shaped protrusion is used to cooperate with the prying fulcrum and the connecting rod to form an elastically pressing lever mechanism.

7. The multi-segment bending clamp according to claim 6, characterized in that: The part for clamping the component has a cylindrical protrusion.

8. The multi-segment bending clamp according to claim 5, characterized in that: It also includes a rear gripper and a third fastener. The rear gripper is located on the rear side of the reference block, and the third fastener passes through the reference block and fixes the front gripper and the rear gripper relative to each other. The vibration-damping elastic element includes a third spring, which is sleeved on the third fastener and has its two ends abutting against the rear clamp and the reference block, respectively. The first spring and the third spring are set at the same height.

9. The multi-segment bending clamp according to claim 1, characterized in that: It includes a stop block, which is located above the reference block, with its bottom abutting against the reference block, and is fixedly connected to the clamping parts.

10. The multi-segment bending clamp according to claim 1, characterized in that: The limiting plate includes a plate body and multiple claws disposed on the rear side of the plate body. The width of each claw is consistent with the preset distance between the corresponding bending blades. The two are adapted to fit together along the second direction. The front surface of the front claw is provided with a first assembly interface. The limiting plate is provided with a second assembly interface adapted to the first assembly interface. The limiting plate is detachably fixed to the front surface of the front claw by a fourth fastener in conjunction with the first assembly interface and the second assembly interface.

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