Crankshaft balance mechanism of press machine

Abstract

The utility model relates to the technical field of press machine crankshaft balancing devices, in particular to a press machine crankshaft balancing mechanism which comprises cranks fixedly installed at the two ends of a crankshaft body, balance blocks are arranged on the lower surfaces of the cranks, wedge-shaped grooves are symmetrically formed in the inner surfaces of the balance blocks and the cranks, wedge-shaped blocks are arranged on the inner surfaces of the wedge-shaped grooves, and the wedge-shaped blocks are arranged on the inner surfaces of the wedge-shaped blocks. The inner surface of the wedge-shaped block is in threaded connection with a second bolt, the outer surface of the second bolt is in threaded connection with a second nut, an assembling groove is formed in the side wall of the balance block, and a plurality of balancing weights used for adjusting the balance value of the crankshaft body are arranged on the inner surface of the assembling groove. The whole crankshaft does not need to be replaced, the production cost is saved, the wedge-shaped groove is tightly matched with the wedge-shaped block, the situation that centrifugal force generated when the crankshaft body rotates promotes loosening and displacement of the balance block is effectively prevented, and tight connection between the balance block and the crank is guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of crankshaft balancing devices for presses, specifically a crankshaft balancing mechanism for presses. Background Technology

[0002] The crankshaft of the press can withstand the force transmitted from the connecting rod and convert it into torque, which is output through the crankshaft to drive other accessories. The existing crankshaft mainly includes: several crankshaft journals and connecting rod journals arranged between two adjacent crankshaft journals. The two ends of the connecting rod journals are connected to the crankshaft journals through cranks, and a balance block is provided at the lower end of the crank.

[0003] Because the connecting rod journal and the crankshaft journal are a certain distance apart and the two journals are not concentric, when the crankshaft rotates, the inertial mass of the piston and connecting rod causes the crankshaft to lose balance and generate a large unbalanced force. This unbalanced force acts on the main journal and increases the load. In order to eliminate this imbalance, a balance weight needs to be installed on the crankshaft crank.

[0004] However, the balance weights are all integrated with the crankshaft, and their mass and size cannot be changed. If the crankshaft imbalance value fails to meet the standard during testing, it needs to be reworked. Moreover, if a cylinder malfunction occurs and the balance weights are damaged, the entire crankshaft will be unusable and will need to be replaced, which is costly. Utility Model Content

[0005] The purpose of this utility model is to provide a crankshaft balancing mechanism for a press, in order to solve the problems mentioned in the background art, where the balance blocks are all integrated with the crankshaft, and their mass cannot be changed. If the crankshaft imbalance value fails to meet the standard during testing, rework is required. Furthermore, if a cylinder malfunction occurs and the balance blocks are damaged, the entire crankshaft will be unusable and will need to be replaced, resulting in high replacement costs.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a crankshaft balancing mechanism for a press, comprising: a crankshaft body and a mounting plate, cranks being fixedly mounted at both ends of the crankshaft body, a balancing block being provided on the lower surface of the crank, symmetrically arranged wedge-shaped grooves being provided on the inner surfaces of the balancing block and the crank, wedge blocks being provided on the inner surfaces of the wedge grooves, a second bolt being threadedly connected to the inner surface of the wedge block, and a second nut being threadedly connected to the outer surface of the second bolt;

[0007] The side wall of the balance block has an assembly groove, and the inner surface of the assembly groove is provided with several counterweights for adjusting the balance value of the crankshaft body.

[0008] Preferably, the wedge block is shaped to fit the wedge groove, and the wedge block is fixed to the balance block by the threaded connection of the second bolt and the second nut. The balance block and the crank are detachable.

[0009] Preferably, the upper end of the assembly groove has two dovetail grooves, and the upper end of the counterweight is fixedly installed with a dovetail protrusion. The counterweight is tightly connected to the balance block through the sliding fit between the dovetail protrusion and the dovetail groove.

[0010] Preferably, the side surface of the counterweight is threaded with two first bolts, the outer surface of the first bolts is threaded with a fixing plate, the fixing plate is in contact with the surface of the counterweight, and the upper surface of the fixing plate is provided with a first nut, which is threadedly connected to the first bolt.

[0011] Preferably, the crankshaft body is rotatably connected to the mounting plate, a base is fixedly mounted on the lower surface of the mounting plate, a motor is fixedly mounted on the side surface of the mounting plate, the output end of the motor is rotatably connected to one end of the crankshaft body, and two symmetrically arranged slide rails are fixedly mounted on the inner side of the mounting plate, with slide grooves formed on the inner surface of the slide rails.

[0012] Preferably, the inner surface of the slide groove is slidably connected to a linkage mechanism, which includes: a pressure plate, a slide seat fixedly installed on the side surface of the pressure plate, the slide seat being slidably connected to the slide groove, a ball-and-socket mechanism being provided on the upper surface of the pressure plate, a connecting rod being movably connected to the inner surface of the ball-and-socket mechanism, a connecting member being fixedly installed on the upper surface of the connecting rod, and the inner surface of the connecting member being rotatably installed with the crankshaft body.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] This utility model proposes a crankshaft balancing mechanism for a press.

[0015] The crank and balance weights are detachable, allowing for quick replacement when the balance weights wear out or require adjustment, reducing downtime and saving production costs by eliminating the need to replace the entire crankshaft. Two wedge-shaped blocks are inserted into wedge grooves inside the crank and balance weights, secured with a second bolt and nut. This tight fit between the wedge grooves and wedge-shaped blocks effectively prevents the balance weights from loosening or shifting due to centrifugal force generated during crankshaft rotation, ensuring a secure connection between the balance weights and the crank. Furthermore, during dynamic balancing tests, to achieve optimal balance, there is no need to disassemble and rework the balance weights. The crankshaft balance is adjusted by changing the number of counterweights in the mounting and dismounting slots to achieve the best balance. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0017] Figure 2 This is a schematic diagram of the crankshaft body structure of this utility model;

[0018] Figure 3This is a schematic diagram of the detachable balance block installation structure of this utility model;

[0019] Figure 4 This is an internal sectional view of the crank and balance weight mounting structure of this utility model.

[0020] Figure 5 This is a schematic diagram of the wedge-shaped mounting connection assembly of this utility model.

[0021] In the diagram: 1. Base; 2. Mounting plate; 3. Slide rail; 4. Slide groove; 5. Connecting rod; 6. Pressure plate; 7. Ball socket mechanism; 8. Slide seat; 9. Motor; 10. Connecting part; 11. Crankshaft body; 12. Crank; 13. Balance block; 14. Wedge groove; 15. Dovetail groove; 16. Assembly groove; 17. Counterweight block; 18. Dovetail protrusion; 19. Fixing plate; 20. First bolt; 21. First nut; 22. Wedge block; 23. Second bolt; 24. Second nut. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] Please see Figures 1 to 5 This utility model provides a technical solution: a crankshaft balancing mechanism for a press;

[0024] Example 1:

[0025] To achieve a detachable structure for the crank 12 and the balance block 13, and to prevent the balance block 13 from loosening or shifting due to centrifugal force generated during crankshaft body 11 rotation, crank 12s are fixedly installed at both ends of crankshaft body 11. A balance block 13 is provided on the lower surface of the crank 12. Symmetrically arranged wedge-shaped grooves 14 are formed on the inner surfaces of both the balance block 13 and the crank 12. Wedge blocks 22 are provided on the inner surfaces of the wedge grooves 14. A second bolt 23 is threaded onto the inner surface of the wedge block 22, and a second nut 24 is threaded onto the outer surface of the second bolt 23. The shape of the wedge block 22 matches the wedge groove 14, and the wedge block 22 is connected to the second bolt 23 via the second bolt 23. The threaded connection of the two nuts 24 is fixed to the balance block 13. The balance block 13 and the crank 12 are detachable. When the balance block 13 is worn or the balance effect needs to be adjusted, it is easy to disassemble and replace it quickly, reducing downtime and eliminating the need to replace the entire crankshaft, thus saving production costs. By inserting the two wedge blocks 22 into the wedge grooves 14 inside the crank 12 and the balance block 13, and fixing them with the second bolt 23 and the second nut 24, the tight fit between the wedge grooves 14 and the wedge blocks 22 effectively prevents the centrifugal force generated when the crankshaft body 11 rotates from causing the balance block 13 to loosen and shift, ensuring a tight connection between the balance block 13 and the crank 12.

[0026] Example 2:

[0027] To enhance the adjustment effect of the crankshaft body 11 balance value based on Embodiment 1, an assembly groove 16 is provided on the side wall of the balance block 13. The inner surface of the assembly groove 16 is provided with a number of counterweights 17 for adjusting the balance value of the crankshaft body 11. Two dovetail grooves 15 are provided at the upper end of the assembly groove 16. A dovetail protrusion 18 is fixedly installed at the upper end of the counterweight 17. The counterweight 17 is tightly connected to the balance block 13 through the sliding fit between the dovetail protrusion 18 and the dovetail groove 15. Two first bolts 20 are threadedly connected to the side surface of the balance block 13. A fixing plate 19 is threadedly connected to the outer surface of the first bolts 20. The fixing plate 19 is in contact with the surface of the counterweight 17. A first nut 21 is provided on the upper surface of the fixing plate 19. The first nut 21 is threadedly connected to the first bolts 20. During dynamic balancing tests, in order to achieve the best balance effect, it is not necessary to disassemble and rework the balance block 13. The balance value of the crankshaft body 11 is adjusted by disassembling and assembling the counterweights 17 in the assembly groove 16 to achieve the best balance effect.

[0028] Working principle: In actual use, when the balance block 13 is worn or the balance effect needs to be adjusted, it can be easily disassembled and quickly replaced, reducing downtime and eliminating the need to replace the entire crankshaft, thus saving production costs. By inserting two wedge blocks 22 into the wedge grooves 14 inside the crank 12 and the balance block 13, and fixing them with the second bolt 23 and the second nut 24, the tight fit between the wedge grooves 14 and the wedge blocks 22 effectively prevents the centrifugal force generated when the crankshaft body 11 rotates from causing the balance block 13 to loosen and shift, ensuring a tight connection between the balance block 13 and the crank 12. During dynamic balancing tests, in order to achieve the best balance effect, it is not necessary to disassemble and rework the balance block 13. The balance value of the crankshaft body 11 is adjusted by disassembling and assembling the counterweights 17 in the assembly and disassembly slot 16 to achieve the best balance effect.

[0029] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A crankshaft balancing mechanism for a press, characterized in that: include: The crankshaft body (11) and the mounting plate (2) are provided. Cranks (12) are fixedly installed at both ends of the crankshaft body (11). A balance block (13) is provided on the lower surface of the crank (12). A wedge groove (14) is symmetrically arranged on the inner surface of the balance block (13) and the crank (12). A wedge block (22) is provided on the inner surface of the wedge groove (14). A second bolt (23) is threaded on the inner surface of the wedge block (22). A second nut (24) is threaded on the outer surface of the second bolt (23). The side wall of the balance block (13) is provided with an assembly groove (16), and the inner surface of the assembly groove (16) is provided with a number of counterweights (17) for adjusting the balance value of the crankshaft body (11).

2. The crankshaft balancing mechanism for a press according to claim 1, characterized in that: The shape of the wedge block (22) matches the wedge groove (14). The wedge block (22) is fixed to the balance block (13) by the threaded connection of the second bolt (23) and the second nut (24). The balance block (13) and the crank (12) are detachable.

3. The crankshaft balancing mechanism for a press according to claim 1, characterized in that: The upper end of the assembly groove (16) has two dovetail grooves (15), and the upper end of the counterweight (17) is fixedly installed with a dovetail protrusion (18). The counterweight (17) is tightly connected to the balance block (13) through the sliding fit between the dovetail protrusion (18) and the dovetail groove (15).

4. The crankshaft balancing mechanism for a press according to claim 1, characterized in that: The side surface of the balance block (13) is threaded with two first bolts (20), and the outer surface of the first bolts (20) is threaded with a fixing plate (19). The fixing plate (19) is in contact with the surface of the counterweight block (17). The upper surface of the fixing plate (19) is provided with a first nut (21), and the first nut (21) is threaded with the first bolts (20).

5. A crankshaft balancing mechanism for a press according to claim 1, characterized in that: The crankshaft body (11) is rotatably connected to the mounting plate (2). A base (1) is fixedly installed on the lower surface of the mounting plate (2). A motor (9) is fixedly installed on the side surface of the mounting plate (2). The output end of the motor (9) is rotatably connected to one end of the crankshaft body (11). Two symmetrically arranged slide rails (3) are fixedly installed on the inner side of the mounting plate (2). A slide groove (4) is opened on the inner surface of the slide rail (3).

6. A crankshaft balancing mechanism for a press according to claim 5, characterized in that: The inner surface of the slide groove (4) is slidably connected to a linkage mechanism, which includes: a pressure plate (6), a slide seat (8) fixedly installed on the side surface of the pressure plate (6), the slide seat (8) being slidably connected to the slide groove (4), a ball socket mechanism (7) being provided on the upper surface of the pressure plate (6), a connecting rod (5) being movably connected to the inner surface of the ball socket mechanism (7), a connecting piece (10) being fixedly installed on the upper surface of the connecting rod (5), and the inner surface of the connecting piece (10) being rotatably installed with the crankshaft body (11).

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