Locking device for a press balancer

Abstract

The utility model discloses a kind of fixed lock connecting devices of punch balancer, including balance cylinder, pull rod head and fixed seat, balance cylinder is fixed in the upper end of punch rack, the upper end of pull rod head is fixed with the lower end of piston rod of balance cylinder, characterized in that the upper end of punch slider is fixedly provided with connecting plate, connecting plate is provided with through-hole, the lower end of pull rod head is connected with fixed seat by passing through through-hole downwards, fixed seat is provided with gland, gland is fixed with the inner side of connecting plate, so that the upper end surface of fixed seat is in abutment with the lower end surface of connecting plate;Advantage is that the fixed position of screw is set on the inner side of connecting plate in the fixed lock connecting device, so that operation space is larger, it is convenient for operating personnel to disassemble and assemble fixed seat, and when balancer works, the upper end surface of fixed seat is stressed, surface pressure is enough big, so that the use of balancer is safe and reliable, stable;In addition, the installation of the fixed lock connecting device does not need professional operating personnel to operate, and connection is stable and reliable.

Description

Technical Field

[0001] This utility model relates to the field of punch press technology, and in particular to a locking connection device for a punch press balancer. Background Technology

[0002] During the stamping process, the flywheel's load increases as the slide rises from the bottom dead center. When it descends to the bottom dead center, the weight of the slide, upper die, connecting rod, etc., causes the slide to fall rapidly, resulting in impact on the drive shaft and generating noise. To solve this problem, existing stamping presses install a balancer between the upper end of the frame and the slide. The balancer balances the weight of the connecting rod, slide assembly, and upper die, eliminates the backlash in the drive shaft, avoids the impact force caused by the slide changing direction due to the backlash during movement, improves the smoothness of the slide movement, and effectively improves the stamping accuracy of the product.

[0003] However, existing balancers are typically fixed to the upper surface of the slide block with locking screws at the lower end. For small punch presses, where space is limited, this fixing method results in limited operating space for operators, making disassembly and assembly inconvenient, time-consuming, and labor-intensive. Furthermore, the locking screws, being load-bearing components, are prone to fatigue fracture after prolonged use, leading to instability. Additionally, when replacing the upper die with a heavier one, the specifications of the locking screws also need to be changed, resulting in poor versatility. Moreover, the locking screws require special anti-loosening treatment by professional operators; improper handling can easily pose safety hazards. Summary of the Invention

[0004] The technical problem to be solved by this utility model is to provide a locking connection device for a punch press balancer that is easy to assemble and disassemble, has a stable and reliable connection, and is highly versatile.

[0005] The technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows: a fixed locking connection device for a punch press balancer, including a balance cylinder, a pull rod head and a fixed seat. The balance cylinder is fixed to the upper end of the punch press frame. The upper end of the pull rod head is fixed to the lower end of the piston rod of the balance cylinder. A connecting plate is fixedly provided on the upper end of the punch press slide. A through hole is provided on the connecting plate. The lower end of the pull rod head passes downward through the through hole and connects to the fixed seat. A pressure cover is provided on the fixed seat. The pressure cover is fixed to the inner side of the connecting plate, so that the upper end surface of the fixed seat abuts against the lower end surface of the connecting plate.

[0006] Furthermore, the lower end of the pull rod head is a T-shaped head, and the fixing seat is provided with a T-shaped groove, into which the T-shaped head slides.

[0007] Furthermore, a limiting protrusion is integrally provided on the lower end face of the connecting plate, one end of the fixing seat abuts against the limiting protrusion, the pressure cover is L-shaped, the horizontal part of the pressure cover extends into the T-shaped groove to hook the other end of the fixing seat, and the vertical part of the pressure cover is fixed to the inner side of the connecting plate.

[0008] Furthermore, the vertical part of the pressure cap is fixed to the inner side of the connecting plate by screws.

[0009] Furthermore, the pull rod head is provided with an upper stepped surface, and there is a first gap between the lower end face of the T-head and the inner bottom surface of the T-slot. When the punch press slide is at the bottom dead center position, the height of the second gap between the upper stepped surface and the upper end face of the connecting plate is less than the height of the first gap.

[0010] Furthermore, there is a third gap between the pull rod head and the through hole.

[0011] Furthermore, the upper end of the pull rod head is fixed to the lower end of the piston rod of the balance cylinder by a threaded connection.

[0012] Compared with the prior art, the advantages of this utility model are: (1) The locking connection device sets the fixing position of the screw on the inner side of the connecting plate, which makes the operating space larger, facilitates the disassembly and assembly of the fixing seat by the operator, and improves the work efficiency. (2) The locking connection device makes the upper surface of the fixed seat bear the force when the balancer is working, and the surface pressure is large enough, so that the balancer is safe, reliable and stable in use; and since the fixed seat bears the tension of the balance cylinder, when the upper mold with a larger weight is replaced, there is no need to change the specifications of the screws and the connecting plate, which has good versatility. (3) The installation of this locking connection device does not require professional personnel to operate, and the connection is stable and reliable. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the installation of this utility model on a punch press; Figure 2 for Figure 1 Enlarged view of point A in the middle; Figure 3 for Figure 2 A three-dimensional sectional view; Figure 4 This is a front sectional view of the present invention; Figure 5 for Figure 2 A schematic diagram of the three-dimensional structure after removing the pressure cap. Detailed Implementation

[0014] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0015] As shown in the figure, a locking connection device for a punch press balancer includes a balance cylinder 1, a pull rod head 2, a fixed base 3, and a pressure cover 6. The balance cylinder 1 is fixed to the upper end of the punch press frame 4. The upper end of the pull rod head 2 is screwed to the lower end of the piston rod 11 of the balance cylinder 1. A connecting plate 51 is fixedly provided on the upper end of the punch press slide block 5. A through hole 52 is provided on the connecting plate 51. The lower end of the pull rod head 2 passes downward through the through hole 52. The diameter of the through hole 52 is larger than the diameter of the pull rod head 2, or the through hole 52 is an oblong hole, so that there is a third gap between the pull rod head 2 and the through hole 52. When the punch press slide block 5 is adjusted left and right due to its cooperation with the guide, the pull rod head 2 is locked. The rod head 2 will not get stuck due to the adjustment of the left and right position of the punch press slide 5, thus avoiding damage to the balancer; the lower end of the rod head 2 is a T-shaped head 21, and the fixed seat 3 is provided with a T-shaped groove 31. The T-shaped head 21 slides into the T-shaped groove 31. The lower end face of the connecting plate 51 is integrally provided with a limiting protrusion 53. One end of the fixed seat 3 abuts against the limiting protrusion 53. The pressure cover 6 is L-shaped. The horizontal part of the pressure cover 6 extends into the T-shaped groove 31 to hook the other end of the fixed seat 3. The vertical part of the pressure cover 6 is fixed to the inner side of the connecting plate 51 by screws or other existing methods, so that the upper end face of the fixed seat 3 abuts against the lower end face of the connecting plate 51.

[0016] In the above embodiments, an upper stepped surface 22 can also be provided on the pull rod head 2. There is a first gap 7 between the lower end face of the T-head 21 and the inner bottom face of the T-slot 31. When the punch press slide 5 is at the bottom dead center position, the height M of the second gap 8 between the upper stepped surface 22 and the upper end face of the connecting plate 51 is less than the height N of the first gap 7. When the balance cylinder 1 loses air, the piston rod 11 and the pull rod head 2 fall due to their own weight. The upper stepped surface 22 on the pull rod head 2 abuts against the upper end face of the connecting plate 51, which can effectively prevent the piston rod 11 and the pull rod head 2 from falling due to their own weight and hitting the fixed seat 3, causing damage to the fixed seat.

[0017] The installation and force-bearing principle of the locking connection device of this utility model is as follows: First, the pull rod head 2 is screwed and fixed to the lower end of the piston rod 11 of the balance cylinder 1. Then, the balance cylinder 1 is fixed to the upper end of the punch press frame 4. The piston rod 11 is pulled down until the pull rod head 2 passes through the through hole 52 on the connecting plate 51. When the upper step surface 22 on the pull rod head 2 abuts against the upper end surface of the connecting plate 51, the T-slot 31 of the fixing seat 3 can be easily pushed in along the T-head 21 until one end abuts against the limiting protrusion 53 on the connecting plate 51. Then, the fixing seat 3 is pushed upward until its upper end surface abuts against the lower end surface of the connecting plate 51. Finally, the horizontal part of the pressure cover 6 is inserted into the T-slot 31 to hook the other end of the fixing seat 3. The vertical part of the pressure cover 6 is fixed to the inner side of the connecting plate 51 by screws.

[0018] When the punch press is working, regardless of whether the punch press slide 5 is descending or rising, the balance cylinder 1 always provides an upward pulling force to the punch press slide 5. That is, the T-head 21 always pulls the fixed seat 3 upward. The upper end face of the fixed seat 3 abuts against the lower end face of the connecting plate 51 and is subjected to force to withstand the pulling force of the balance cylinder 1. The screw is used to fix the pressure cover 6, and its main function is to prevent the fixed seat 3 from falling off.

[0019] The scope of protection of this utility model includes, but is not limited to, the above embodiments. The scope of protection is defined by the claims. Any substitutions, modifications, or improvements to this technology that are easily conceived by those skilled in the art shall fall within the scope of protection of this utility model.

Claims

1. A locking connection device for a punch press balancer, comprising a balance cylinder, a pull rod head, and a fixed base, wherein the balance cylinder is fixed to the upper end of the punch press frame, and the upper end of the pull rod head is fixed to the lower end of the piston rod of the balance cylinder, characterized in that: A connecting plate is fixedly installed at the upper end of the punch press slide. The connecting plate has a through hole. The lower end of the pull rod head passes downward through the through hole and connects to the fixed seat. A pressure cover is installed on the fixed seat. The pressure cover is fixed to the inner side of the connecting plate, so that the upper end face of the fixed seat abuts against the lower end face of the connecting plate.

2. The locking connection device for a punch press balancer as described in claim 1, characterized in that: The lower end of the pull rod head is a T-shaped head, and the fixing seat is provided with a T-shaped groove, into which the T-shaped head slides.

3. The locking connection device for a punch press balancer as described in claim 2, characterized in that: The lower end face of the connecting plate is integrally provided with a limiting protrusion. One end of the fixing seat abuts against the limiting protrusion. The pressure cover is L-shaped. The horizontal part of the pressure cover extends into the T-shaped groove to hook the other end of the fixing seat. The vertical part of the pressure cover is fixed to the inner side of the connecting plate.

4. The locking connection device for a punch press balancer as described in claim 3, characterized in that: The vertical part of the pressure cap is fixed to the inner side of the connecting plate by screws.

5. The locking connection device for a punch press balancer as described in claim 2, characterized in that: The pull rod head is provided with an upper stepped surface, and there is a first gap between the lower end face of the T-head and the inner bottom surface of the T-slot. When the punch press slide is at the bottom dead center position, the height of the second gap between the upper stepped surface and the upper end face of the connecting plate is less than the height of the first gap.

6. The locking connection device for a punch press balancer as described in claim 1, characterized in that: There is a third gap between the pull rod head and the through hole.

7. The locking connection device for a punch press balancer as described in claim 1, characterized in that: The upper end of the pull rod head is fixed to the lower end of the piston rod of the balance cylinder by a threaded connection.

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