Safe anti-falling mechanism for paper taking and unloading
By introducing the eccentric shaft and the eccentric section of the torsion spring into the paper removal and unloading equipment and connecting it with the lifting sprocket, the torsion preload force of the torsion spring is used to push the safety pin to prevent the falling of the chain when the chain is broken, and automatically resumes normal work after troubleshooting, the safety hazards and recovery difficulties caused by chain break are solved, and the safety and simplicity of the equipment are achieved.
Patent Information
- Application Number
- CN202422293451.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-20
- Publication Date
- 2025-07-04
- Estimated Expiration
- 2034-09-20
AI Technical Summary
The chains of existing paper removal and unloading equipment are prone to breaking, causing the lifting beam and paper removal and unloading workbench to fall rapidly, affecting the safety of the equipment, and restoring normal work requires manual or other lifting equipment, which is time-consuming and inconvenient.
An eccentric shaft and a torsion spring are provided on the lifting beam, which is connected to the lifting sprocket through the eccentric section of the eccentric shaft. The torsion preload force of the torsion spring pushes the safety pin into the limit slot when the chain breaks, prevents falling, and returns to normal working state by tightening it through the motor after the chain is reconnected.
Effectively prevent the falling of the chain when it breaks, simplifies the fault recovery process, reduces the labor intensity of workers, and ensures the safe and efficient operation of the equipment.
Smart Images
Figure CN223060355U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a paper taking and unloading device for automatically quantitatively taking or unloading paper, in particular to a safety protection mechanism of a paper taking and unloading device. Background Art
[0002] The paper taking and unloading device includes a paper taking machine and a paper unloading machine, which is a post-press packaging machine for automatically and quantitatively taking and unloading stacked paper and reducing the labor intensity of workers. The existing paper taking and unloading device includes a lifting cross beam connected to a paper taking and unloading workbench. A lifting sprocket is installed on the lifting cross beam. The lifting sprocket is pulled by a chain. One end of the chain is fixedly connected to the machine frame, and the other end is connected to the machine frame after passing around a motor sprocket and a counterweight sprocket. The motor installed with the motor sprocket is fixedly installed on the machine frame, and the counterweight sprocket is installed on a counterweight. The counterweight is arranged to move up and down. Since the lifting cross beam, the paper taking and unloading workbench and the installation components thereon themselves have a large weight, and the stacked paper on the paper taking and unloading workbench during operation also has a large weight, the tension on the chain is also very large and is likely to cause breakage. After the chain breaks, the lifting cross beam and the paper taking and unloading workbench will quickly fall, seriously affecting the safe use of the device. Also considering the weight of the lifting cross beam, the paper taking and unloading workbench and the installation components thereon, the normal operation recovery after the chain breaks requires manual or other lifting equipment to lift the paper taking and unloading workbench, which is time-consuming and inconvenient, and the labor intensity of workers is high. Summary of the Invention
[0003] Aiming at the deficiencies of the existing technology, the purpose of the utility model is to provide a paper taking and unloading safety anti-falling mechanism that can not only effectively ensure the safe operation of the device, but also restore the anti-falling mechanism to its original state through simple and labor-saving operations.
[0004] The utility model is implemented through the following technical solutions:
[0005] Paper taking and unloading safety anti-falling mechanism, including a lifting cross beam connected to the paper taking and unloading workbench. A lifting sprocket is installed on the lifting cross beam. The lifting sprocket is pulled by a chain. One end of the chain is fixedly connected to the machine frame, and the other end is connected to the machine frame after passing around the motor sprocket and the counterweight sprocket. The motor with the motor sprocket is fixedly installed on the machine frame. The counterweight sprocket is installed on the counterweight. The counterweight is arranged to move up and down. It is characterized in that: an eccentric shaft is rotatably arranged on the lifting cross beam. The eccentric shaft is pushed by a torsion spring to rotate. The eccentric shaft has a shaft rod section, an eccentric section and an anti-falling pin pushing section. The shaft rod section is connected to the lifting cross beam, the eccentric section is connected to the lifting sprocket, the lifting sprocket is sleeved on the outer circle of the eccentric section, and the anti-falling pin pushing section is connected to the left and right safety pins; in the normal working state, under the combined action of the chain tension and the gravity of the lifting cross beam and the paper taking and unloading workbench, the balance of forces causes the center of the eccentric section to be directly above the center of the shaft rod section. At this time, the torsion spring has the maximum torsional pre-tightening force; in the state of chain breakage, the balance of forces is destroyed, and the torsional pre-tightening force of the torsion spring causes the eccentric shaft to rotate. The anti-falling pin pushing section pushes the left and right safety pins to extend outwards, so that the heads of the left and right safety pins can be inserted into the corresponding anti-falling limit grooves. The anti-falling limit grooves are arranged on the limit plate, and the limit plate is fixedly installed on the machine frame; after the chain breaks and is reconnected, the motor drives to tighten the chain, and the balance of forces causes the eccentric shaft to return and the torsion spring to reset. The center of the eccentric section returns to directly above the center of the shaft rod section, and then the paper taking and unloading machine resumes the normal working state.
[0006] The paper loading and unloading safety anti-falling mechanism of the above technical solution has the following working principle: Under normal working conditions, the chain pulls the lifting crossbeam and the paper loading and unloading workbench through the lifting sprocket and the eccentric shaft. Under the combined action of the chain tension and the gravity of the lifting crossbeam and the paper loading and unloading workbench, the force balance will cause the eccentric shaft to rotate until the center of the eccentric section is directly above the center of the shaft rod section and remains there. The torsion spring is in the maximum torsion position with the maximum torsional pre-tightening force. At this time, when the motor operates, it will drive the lifting crossbeam and the paper loading and unloading workbench to move up and down to perform the automatic quantitative paper loading and unloading operation on the stacked paper by the equipment. At this time, if the weight is increased on the paper loading and unloading workbench, such as stacking paper on the paper loading and unloading workbench, the eccentric shaft will not rotate; when the chain breaks, the force balance is suddenly destroyed, and the torsional pre-tightening force of the torsion spring will cause the eccentric shaft to rotate immediately. Then, the pushing section of the anti-falling pin pushes the left and right safety pins to extend outwards, so that the heads of the left and right safety pins can be inserted into the corresponding anti-falling limit grooves, preventing the falling of the lifting crossbeam and the paper loading and unloading workbench, and effectively ensuring the working safety of the equipment; after eliminating the fault, the operator only needs to reconnect the broken chain and then start the motor to tighten the chain. At this time, under the combined action of the chain tension and the gravity of the lifting crossbeam and the paper loading and unloading workbench, the force balance will cause the eccentric shaft to rotate back to its original position, and the center of the eccentric section of the eccentric shaft returns to directly above the center of the shaft rod section and remains there. At the same time, the torsion spring resets and the safety pins retract. At this time, the anti-falling mechanism returns to its original state, and the paper loading and unloading machine also returns to the normal working state. The operation is time-saving and labor-saving, and the action structure of the anti-falling mechanism is simple and reliable.
[0007] Preferably, the tail end of the left safety pin is hinged to the left push rod, the left push rod is hinged to the left end of the pushing section of the anti-falling pin, the tail end of the right safety pin is hinged to the right push rod, the right push rod is hinged to the right end of the pushing section of the anti-falling pin, and the movement of the left and right safety pins is guided by the safety pin guide block.
[0008] Preferably, a bearing is provided between the inner hole of the lifting sprocket and the outer circle of the eccentric section. BRIEF DESCRIPTION OF THE DRAWINGS
[0009] The present utility model has the following drawings:
[0010] Figure 1 is a schematic structural view of the paper loading and unloading machine of the present utility model,
[0011] Figure 2 is Figure 1 the structural view after removing the lifting crossbeam (safety pin extended),
[0012] Figure 3 is Figure 2 the enlarged structural view of the lifting sprocket part in
[0013] Figure 4 is Figure 3Cross-sectional view,
[0014] Figure 5 It is a state diagram of the eccentric shaft after the chain breaks (the safety pin extends out),
[0015] Figure 6 It is a state diagram of the eccentric shaft during normal operation (the safety pin retracts). Specific implementation manner
[0016] As shown in the figure, the paper taking and unloading safety anti-falling mechanism of the present utility model includes a lifting cross beam 1 connected to the paper taking and unloading workbench. A lifting sprocket 4 is installed on the lifting cross beam 1. The lifting sprocket 4 is pulled by a chain 9. One end of the chain 9 is fixedly connected to the machine frame 8, and the other end is connected and fixed to the machine frame 8 after passing around the motor sprocket 6 and the counterweight sprocket 5. The motor 7 installing the motor sprocket 6 is fixedly installed on the machine frame 8. The counterweight sprocket 5 is installed on the counterweight 3, and the counterweight 3 is arranged to move up and down. An eccentric shaft 2 is rotatably provided on the lifting cross beam 1. The eccentric shaft 2 is pushed by a torsion spring 17 to rotate. One end of the torsion spring 17 is clamped on the lifting cross beam 1, and the other end is clamped on the eccentric shaft 2. The eccentric shaft 2 has a shaft rod section 21, an eccentric section 22, and an anti-falling pin pushing section 23. The shaft rod section 21 is connected to the lifting cross beam 1, and the shaft rod section 21 is rotatably supported in the assembly hole of the lifting cross beam 1. The eccentric section 22 is connected to the lifting sprocket 4. The lifting sprocket 4 is sleeved on the outer circle of the eccentric section 22. A bearing 18 is provided between the inner hole of the lifting sprocket 4 and the outer circle of the eccentric section 22. The anti-falling pin pushing section 23 is connected to the left and right safety pins. The tail end of the left safety pin 12 is hinged to the left push rod 13, and the left push rod 13 is hinged to the left side end of the anti-falling pin pushing section 23. The tail end of the right safety pin 14 is hinged to the right push rod 16, and the right push rod 16 is hinged to the right side end of the anti-falling pin pushing section 23. The movement of the left and right safety pins is guided by the safety pin guide block 15, and the safety pin guide block 15 is fixedly installed on the lifting cross beam 1. Limit plates 10 are provided on the left and right sides of the lifting sprocket 4, and the limit plates 10 are fixedly installed on the machine frame 8. Anti-falling limit grooves 11 are provided on the limit plates 10.
[0017] Under normal working conditions, the chain 9 pulls the lifting cross beam 1 and the paper taking and unloading workbench through the lifting sprocket 4 and the eccentric shaft 2. Under the combined action of the chain tension and the gravity of the lifting cross beam and the paper taking and unloading workbench, the force balance will cause the eccentric shaft 2 to rotate until the center A of the eccentric section 22 is directly above the center B of the shaft rod section 21 and always maintain ( Figure 6 the state shown), at this time the torsion spring 17 is in the maximum torsion position and the torsion pre-tightening force is the largest. At this time, the motor 7 operates to drive the lifting cross beam 1 and the paper taking and unloading workbench to move up and down, and the equipment can perform the automatic quantitative paper taking and unloading action on the stacked paper; when the chain 9 breaks, the force balance is suddenly destroyed, and the torsion pre-tightening force of the torsion spring 17 will cause the eccentric shaft 2 to immediately rotate 90 degrees, so the anti-falling pin pushing section 23 pushes the left and right safety pins to extend out (Figure 5 In the state shown, the heads of the left and right safety pins can be inserted into the corresponding anti-falling limit grooves 11, preventing the lifting cross beam 1 and the paper loading and unloading workbench from falling, thus effectively ensuring the working safety of the equipment. After eliminating the fault, the operator only needs to reconnect the broken chain and then start the motor to tighten the chain. At this time, under the combined action of the chain tension and the gravity of the lifting cross beam and the paper loading and unloading workbench, the force balance will cause the eccentric shaft to rotate back to its original position. The center of the eccentric section of the eccentric shaft will return to directly above the center of the shaft rod section and remain there. At the same time, the torsion spring resets and the safety pin retracts. At this time, the anti-falling mechanism returns to its original state, and the paper loading and unloading machine also returns to the normal working state.
Claims
1. Unloading paper safety anti-falling mechanism, including a lifting crossbeam connected to the unloading paper workbench, a lifting sprocket is installed on the lifting crossbeam, the lifting sprocket is pulled by a chain, one end of the chain is fixedly connected to the frame, and the other end is connected and fixed to the frame after bypassing the motor sprocket and the counterweight sprocket. The motor with the motor sprocket is fixedly installed on the frame, the counterweight sprocket is installed on the counterweight, and the counterweight is arranged to move up and down. It is characterized in that: An eccentric shaft is rotatably provided on the lifting cross beam. The eccentric shaft is pushed by a torsion spring to rotate. The eccentric shaft has a shaft rod section, an eccentric section, and an anti-falling pin pushing section. The shaft rod section is connected to the lifting cross beam, the eccentric section is connected to the lifting sprocket, the lifting sprocket is sleeved on the outer circle of the eccentric section, and the anti-falling pin pushing section is connected to the left and right safety pins; in the normal working state, under the combined action of the chain tension and the gravity of the lifting cross beam and the paper taking and unloading table, the balance of forces causes the center of the eccentric section to be directly above the center of the shaft rod section. At this time, the torsion spring has the maximum torsional pre-tightening force; in the state of chain breakage, the balance of forces is destroyed, and the torsional pre-tightening force of the torsion spring causes the eccentric shaft to rotate. The anti-falling pin pushing section pushes the left and right safety pins to extend outwards, so that the heads of the left and right safety pins can be inserted into the corresponding anti-falling limit grooves. The anti-falling limit grooves are arranged on the limit plate, and the limit plate is fixedly installed on the frame; after the chain breaks and is reconnected, the motor drives to tighten the chain, and the balance of forces causes the eccentric shaft to return and the torsion spring to reset. The center of the eccentric section returns to directly above the center of the shaft rod section, and then the paper taking and unloading machine resumes the normal working state.
2. The paper taking and unloading safety anti-falling mechanism according to claim 1, characterized in that: The tail end of the left safety pin is hinged to connect the left push rod, the left push rod is hinged to connect the left side end of the anti-falling pin pushing section, the tail end of the right safety pin is hinged to connect the right push rod, the right push rod is hinged to connect the right side end of the anti-falling pin pushing section, and the movement of the left and right safety pins is guided by the safety pin guide block.
3. The paper taking and unloading safety anti-falling mechanism according to claim 1, characterized in that: A bearing is provided between the inner hole of the lifting sprocket and the outer circle of the eccentric section.