A precast beam lifting system

Abstract

A precast beam lifting system, comprising a winch, a brake, a speed reducer, a motor, a hydraulic system; wherein the motor is connected to the speed reducer, the speed reducer is connected to the winch, the winch drives the steel wire rope to work to lift or lower the precast beam; the brake is arranged on the winch to brake the work of the winch; the hydraulic system comprises an oil tank, a pump, a filter, a relief valve, an accumulator and a check valve; the pump pumps the oil in the oil tank to output to a hydraulic oil circuit, the check valve is arranged in the hydraulic oil circuit to prevent the oil from flowing backward, the filter is arranged in the hydraulic oil circuit to filter the oil, the relief valve is arranged in the hydraulic oil circuit, and the accumulator is arranged in the hydraulic oil circuit to store the oil; the hydraulic oil circuit is connected to the brake, and the brake is a disc brake.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of land and sea bridge construction, and particularly relates to a precast beam lifting system. BACKGROUND

[0002] In the process of land and sea bridge construction, a bridge erecting machine is generally needed. The bridge erecting machine is a kind of bridge type crane running on an elevated track, also known as a trolley. It can run longitudinally on the track on the elevated track on both sides, and is not hindered by ground equipment. It is the most widely used and largest number of hoisting machinery. The trolley commonly used for precast beam lifting uses a winch, and the winch is controlled by a series of hydraulic control equipment. At the same time, during the construction process, the deformation and displacement of each component of the bridge erecting machine during operation need to be monitored and warned, and the sea wind speed, beam lifting, transportation and beam deflection during the operation of the bridge erecting machine are monitored in real time.

[0003] In actual engineering practice, the following problems exist:

[0004] I. The hydraulic control equipment for trolley lifting in the prior art includes an overflow valve. When the control pressure is too large, in order to avoid the sudden impact of the fluid, the overflow valve is used to guide the excessive pressure back to the oil. The existing overflow valve controls the pre-tightening force by a spring. However, when the length of a single spring is too long, the spring is prone to bending or deviation, resulting in a decrease in service life.

[0005] II. The hydraulic control equipment for trolley lifting in the prior art controls the pre-tightening force by a spring. However, the spring has a service life limit, and cannot be repaired or replaced in real time after damage or expiration of the service life. If the spring is to be disassembled, the spring is connected to the passage and plays a control function, so the entire system needs to be shut down during disassembly and repair.

[0006] III. The hydraulic control equipment for trolley lifting in the prior art pushes the valve core away to play the overflow role through the pressure difference between the upper chamber and the lower chamber of the valve core, and the pressure in the upper chamber is relieved by pushing the pilot valve plate, and finally the pressure in the upper chamber is relieved. However, the liquid in the upper chamber is replenished at any time, and the overall liquid volume does not decrease rapidly, so the pressure in the upper chamber does not decrease in time, resulting in a slow pushing speed of the valve core.

[0007] IV. When the valve core lifting speed is slow, there is a small gap between the valve core and the valve seat, and the rapid reduction of the liquid flow area will cause shaking or weak whistling.

[0008] V. The overflow passage of the hydraulic control equipment for trolley lifting in the prior art is of uniform flow area, and cannot adapt to multifunctional applications or various environments. SUMMARY

[0009] In order to overcome the above problems, the present application proposes a solution to simultaneously solve the above problems.

[0010] The technical scheme adopted by the present application to solve its technical problems is: a precast beam lifting system, comprising a winch, a brake, a speed reducer, a motor, a hydraulic system; wherein the motor is connected to the speed reducer, the speed reducer is connected to the winch, the winch drives the steel wire rope to work to lift or lower the precast beam; the brake is provided on the winch to brake the work of the winch; the hydraulic system comprises an oil tank, a pump, a filter, an overflow valve, an accumulator, and a one-way valve; the pump pumps the oil in the oil tank to output to the hydraulic oil circuit, the one-way valve is provided in the hydraulic oil circuit to prevent backflow of the oil, the filter is provided in the hydraulic oil circuit to filter the oil, the overflow valve is provided in the hydraulic oil circuit, and the accumulator is provided in the hydraulic oil circuit to store the oil; the hydraulic oil circuit is connected to the brake, and the brake is a disc brake;

[0011] The overflow valve comprises a main body, an inlet, an outlet, an upper chamber, a pilot chamber, a left chamber, a damping hole, a pilot flow path, a buffer chamber, an upper chamber spring, a spring module, a driving device, an upper control chamber, a pilot valve plate, a driving rod, a guide plate, an output shaft, an upper through hole, a first pressure relief hole, a lower control chamber, a pilot valve seat, a valve block, a connecting rod, a right chamber, a pressure maintaining plate, a disc, a piston plate, a piston rod, a valve core, a second pressure relief hole, a lower through hole, and a perforation;

[0012] The upper chamber spring is provided in the upper chamber, the piston plate is provided below the upper chamber spring, the piston rod is connected below the piston plate, and the valve core is connected below the piston rod; the valve core can move up and down to open and close the inlet, one end of the damping hole is connected to the inlet, the other end of the damping hole is connected to one end of the pilot flow path, and the other end of the pilot flow path is connected to the pilot chamber; the driving device is connected to one end of the output shaft, the other end of the output shaft is connected to one end of the guide plate, one end of the driving rod is connected to the other end of the guide plate, the other end of the driving rod is connected to the pilot valve plate, and the pilot chamber is formed on the left side of the pilot valve plate in the upper control chamber;

[0013] The lower control cavity is provided with the pilot valve seat, the left side of the pilot valve seat constitutes a left cavity, the right side of the pilot valve seat and the pressure maintaining plate constitute a right cavity, the disc is arranged in the left cavity, the disc is provided with the through hole, the disc is connected with the valve block through a round rod, the round rod penetrates through the pilot valve seat, the valve block is connected with one end of the pressure maintaining plate through the connecting rod, the other end of the pressure maintaining plate is provided with the spring module, the spring module comprises a first plate, a first spring, a second plate, a spring rod, an annular seat, a second spring and a plug; one end of the first plate is connected with one end of the first spring, the other end of the first spring is connected with the second plate, the second plate is integrally connected with the spring rod, the spring rod penetrates through the annular seat, the second spring is sleeved on the spring rod, and the plug abuts against the second spring; the spring coefficient of the first spring is greater than that of the second spring.

[0014] The right cavity is connected with the upper cavity through the lower through hole, when the valve core opens the inlet, the inlet is communicated with the shunt path, the shunt path is provided with the buffer cavity, and the shunt path is communicated with the outlet after passing through the buffer cavity.

[0015] Further, the connecting rod is provided with a positioning structure on the outer periphery, so that the connecting rod moves stably in the lower control cavity.

[0016] Further, the upper control cavity is provided with the pilot valve plate, the driving rod, the guide plate and the output shaft.

[0017] Further, when the pressure pushes the pilot valve plate to move to the right to the open position, the pilot cavity is communicated with the left cavity through the upper through hole, and is communicated with the outlet through the first pressure relief hole.

[0018] Further, when the pressure in the left cavity increases, the disc is pushed to move to the right and abuts against the pilot valve seat, and the pressure maintaining plate is moved to the open position, so that the lower through hole and the second pressure relief hole are in fluid communication.

[0019] Further, the pilot flow path is not communicated with the lower control cavity.

[0020] Further, the first pressure relief hole is not communicated with the lower control cavity.

[0021] Further, the driving device is an electromagnetic driving device.

[0022] Further, the shunt path comprises a branch upstream section, a buffer cavity and a branch downstream section which are communicated in sequence, and the branch upstream section is arranged in a passage connected with the lower part of the buffer cavity.

[0023] Further, the lower through hole and the right cavity are always communicated.

[0024] The beneficial effects of the present application are:

[0025] I. Regarding the first point raised in the background technology, by combining two springs, the length of each spring does not need to be too long. At the same time, the elastic coefficients of the two springs can be different. The elastic coefficient of the inner spring can be larger, and the elastic coefficient of the outer spring can be smaller. Thus, the shorter inner spring can provide more elastic force and timely preload, while the outer spring can provide more stroke coverage to provide buffering force at the same time.

[0026] Second, regarding the second point raised in the background technology, a fixed spring and a detachable spring are provided. The internal spring is a fixed spring, which is enclosed in the annular seat to provide a relatively fixed setting; while the external spring is located outside the annular seat. After removing the plug, the external spring can be replaced. At this time, the internal spring can still provide a relatively stable spring preload, and the pressure plate provides sufficient sealing. After replacing the external spring, even if the elastic force of the internal spring is lost, the external spring itself can still provide a relatively stable spring force for temporary use, thereby adapting to rapid replacement during the working process.

[0027] Third point regarding the background technology

[0028] 1) A circular plate integrated with the valve block is provided. When the pressure causes the valve block to move and connect the upper chamber with the pressure relief channel, the pressure drives the circular plate to subsequently close the pilot valve seat, so that the pressure will not continue to enter the upper chamber. Thus, after the pressure in the upper chamber flows into the pressure relief channel, it will not be replenished in large quantities.

[0029] (ii) At the same time, in order to avoid the pressure in the upper chamber being too low, a flow-through hole is provided on the circular plate. Even if the circular plate touches the pilot valve seat, the fluid will enter the upper chamber through the flow-through hole, thereby providing a small flow of fluid to the upper chamber. This avoids providing too much pressure to affect the opening of the upper chamber and also prevents the pressure in the upper chamber from being too low to buffer.

[0030] Fourthly, regarding the fourth point raised in the background technology, a flow diversion channel is provided on the side of the valve body corresponding to the closed position of the main valve core, so that when the valve core is opened, pressure can be relieved through flow diversion, thereby avoiding the phenomenon of pressure relief due to excessively small gaps.

[0031] Fifth, in response to the fifth point of the background technology, the channels inside the valve body are cleverly arranged, and sufficient space is reserved in the valve body to set up a buffer chamber. The buffer chamber is set in the diversion and pressure relief channel, and the buffer chamber provides sufficient buffer space. The transverse pressure relief channel is connected to the lower part of the buffer chamber, which allows the fluid in the buffer chamber to flow out.

[0032] Note: The above designs are not in any particular order, and each one makes the present invention different from the prior art and a significant advancement. Attached Figure Description

[0033] The application will be further described below in connection with the accompanying drawings and examples.

[0034] Figure 1 is a schematic diagram of the closing state of the overflow valve of the application

[0035] Figure 2 is a schematic diagram of the opening state of the overflow valve of the application

[0036] Figure 3 is a schematic diagram of the round plate structure of the application

[0037] Figure 4 is a schematic diagram of the spring module structure of the application

[0038] Figure 5 is a schematic diagram of the hoist system of the application

[0039] Figure 6 is a schematic diagram of the hydraulic control system of the application

[0040] In the drawings, the reference signs are as follows:

[0041] 1. main body 2. inlet 3. outlet 4. upper chamber 5. pilot chamber 6. left chamber 7. damping hole 8. pilot flow path 9. longitudinal hole 10. branch upstream section 11. buffer chamber 12. branch downstream section 13. upper chamber spring 14. spring module 15. driving device 16. pilot valve plate 17. upper control chamber 18. driving rod 19. guide plate 20. output shaft 21. pilot valve seat 22. upper through hole 23. first pressure relief hole 24. valve block 25. connecting rod 26. lower through hole 27. right chamber 28. pressure maintaining plate 29. disc 30. piston plate 31. piston rod 32. valve core 33. second pressure relief hole 34. perforation 35. first plate 36. first chamber 37. first spring 38. second plate 39. spring rod 40. annular seat 41. second chamber 42. second spring 43. plug 44. hoist 45. brake 46. speed reducer 47. motor 48. connection 50; 49. connection 51; 50. connection 48; 51. connection 49; 52. oil tank 53. pump 54. filter 55. overflow valve 56. energy accumulator 57. check valve. DETAILED DESCRIPTION

[0042] As shown in the figure: a precast beam lifting system, including winch, brake, reducer, motor, hydraulic system; wherein the motor is connected with the reducer, the reducer is connected with the winch, the winch drives the steel wire rope to work to lift or put down the precast beam; the brake is arranged on the winch to brake the work of the winch; the hydraulic system includes oil tank, pump, filter, overflow valve, accumulator, check valve; the pump pumps the oil liquid in the oil tank to output to the hydraulic oil circuit, the check valve is arranged in the hydraulic oil circuit to prevent the oil liquid from flowing back, the filter is arranged in the hydraulic oil circuit to filter the oil liquid, the overflow valve is arranged in the hydraulic oil circuit, and the accumulator is arranged in the hydraulic oil circuit to store the oil liquid; the hydraulic oil circuit is connected to the brake, and the brake is a disc brake;

[0043] The overflow valve comprises a main body, an inlet, an outlet, an upper cavity, a pilot cavity, a left cavity, a damping hole, a pilot flow path, a buffer cavity, an upper cavity spring, a spring module, a driving device, an upper control cavity, a pilot valve plate, a driving rod, a guide plate, an output shaft, an upper through hole, a first pressure relief hole, a lower control cavity, a pilot valve seat, a valve block, a connecting rod, a right cavity, a pressure maintaining plate, a disc, a piston plate, a piston rod, a valve core, a second pressure relief hole, a lower through hole and a perforation.

[0044] The upper cavity spring is arranged in the upper cavity, the piston plate is arranged below the upper cavity spring, the piston rod is connected to the lower side of the piston plate, and the valve core is connected to the lower side of the piston rod; the valve core can be moved up and down to open and close the inlet, one end of the damping hole is connected to the inlet, the other end of the damping hole is communicated with one end of the pilot flow path, and the other end of the pilot flow path is communicated with the pilot cavity; one end of the driving device is connected to the output shaft, the other end of the output shaft is connected to one end of the guide plate, one end of the driving rod is connected to the other end of the guide plate, the other end of the driving rod is connected to the pilot valve plate, and the left side of the pilot valve plate in the upper control cavity forms the pilot cavity.

[0045] The pilot valve seat is arranged in the lower control cavity, the left side of the pilot valve seat forms the left cavity, the right side of the pilot valve seat and the pressure maintaining plate form the right cavity, the disc is arranged in the left cavity, the perforation is arranged on the disc, the disc is connected to the valve block through a round rod, the round rod penetrates through the pilot valve seat, the valve block is connected to one end of the pressure maintaining plate through the connecting rod, the other end of the pressure maintaining plate is provided with the spring module, and the spring module comprises a first plate, a first spring, a second plate, a spring rod, an annular seat, a second spring and a plug.

[0046] The right cavity is connected with the upper cavity through the lower through hole, when the valve core opens the inlet, the inlet is communicated with the shunt path, the shunt path is provided with the buffer cavity, and the shunt path is communicated with the outlet after passing through the buffer cavity.

[0047] As shown in the figure: the connecting rod is provided with a positioning structure on the outer periphery, so that the connecting rod moves stably in the lower control cavity. The upper control cavity is provided with the pilot valve plate, the driving rod, the guide plate and the output shaft. The pilot flow path is not communicated with the lower control cavity. The first pressure relief hole is not communicated with the lower control cavity. The driving device is an electromagnetic driving device. The shunt path includes a branch path upstream section, a buffer cavity and a branch path downstream section communicated in sequence, and the branch path upstream section is connected with the lower part of the buffer cavity. The lower through hole is always communicated with the right cavity.

[0048] The working principle of the overflow valve is as follows: when the inlet pressure is too large, the pressure pushes the pilot valve plate to move to the open position to the right against the driving force, the pilot cavity is communicated with the left cavity through the upper through hole, and is communicated with the outlet through the first pressure relief hole. When the pressure in the left cavity increases, the disc is pushed to move to the right and abuts against the pilot valve seat, and the pressure maintaining plate is moved to the open position, so that the lower through hole is in fluid communication with the second pressure relief hole; so that the pressure in the upper cavity is relieved, and the inlet pressure pushes the valve core to move upward.

[0049] The above detailed description is for the specific description of the feasible embodiments of the present application, and the embodiments are not used to limit the patent scope of the present application. Any equivalent implementation or change without departing from the present application should be included in the patent scope of the present application.

Claims

1. A precast beam lifting system, characterized by: The crane, brake, speed reducer, motor, hydraulic system are included; wherein the motor is connected with the speed reducer, the speed reducer is connected with the crane, the crane drives the steel wire rope to work to lift or lower the precast beam; the brake is arranged on the crane to brake the work of the crane; the hydraulic system includes an oil tank, a pump, a filter, a relief valve, an accumulator and a check valve; the pump pumps the oil in the oil tank to output to the hydraulic oil circuit, the check valve is arranged in the hydraulic oil circuit to prevent the oil from flowing back, the filter is arranged in the hydraulic oil circuit to filter the oil, the relief valve is arranged in the hydraulic oil circuit, and the accumulator is arranged in the hydraulic oil circuit to store the oil; the hydraulic oil circuit is connected to the brake, and the brake is a disc brake; The relief valve comprises a main body, an inlet, an outlet, an upper cavity, a pilot cavity, a left cavity, a damping hole, a pilot flow path, a buffer cavity, an upper cavity spring, a spring module, a driving device, an upper control cavity, a pilot valve plate, a driving rod, a guide plate, an output shaft, an upper through hole, a first pressure relief hole, a lower control cavity, a pilot valve seat, a valve block, a connecting rod, a right cavity, a pressure maintaining plate, a disc, a piston plate, a piston rod, a valve core, a second pressure relief hole, a lower through hole and a perforation; The upper cavity spring is arranged in the upper cavity, the piston plate is arranged below the upper cavity spring, the piston rod is connected to the lower side of the piston plate, and the valve core is connected to the lower side of the piston rod; the valve core can be moved up and down to open and close the inlet, one end of the damping hole is connected to the inlet, the other end of the damping hole is communicated with one end of the pilot flow path, and the other end of the pilot flow path is communicated with the pilot cavity; The driving device is connected to one end of the output shaft, the other end of the output shaft is connected to one end of the guide plate, one end of the driving rod is connected to the other end of the guide plate, the other end of the driving rod is connected to the pilot valve plate, and the left side of the pilot valve plate in the upper control cavity forms the pilot cavity; The pilot valve seat is arranged in the lower control cavity, the left side of the pilot valve seat forms the left cavity, the right side of the pilot valve seat and the pressure maintaining plate form the right cavity, the disc is arranged in the left cavity, the perforation is arranged on the disc, the disc is connected to the valve block through a round rod, the round rod passes through the pilot valve seat, the valve block is connected to one end of the pressure maintaining plate through the connecting rod, the other end of the pressure maintaining plate is provided with the spring module, and the spring module comprises a first plate, a first spring, a second plate, a spring rod, an annular seat, a second spring and a plug; one end of the first plate is connected to one end of the first spring, the other end of the first spring is connected to the second plate, the second plate is integrally connected to the spring rod, the spring rod passes through the annular seat, the second spring is sleeved on the spring rod, and the plug abuts against the second spring; the spring coefficient of the first spring is greater than that of the second spring; The right cavity is connected to the upper cavity through the lower through hole, when the valve core opens the inlet, the inlet is communicated with the shunt, the shunt is provided with the buffer cavity, and the shunt is communicated with the outlet after passing through the buffer cavity.

2. A precast beam lifting system according to claim 1, wherein: The connecting rod is provided with a positioning structure on the outer periphery, so that the connecting rod moves stably in the lower control cavity.

3. The precast beam lifting system of claim 1, wherein: The upper control cavity is provided with the pilot valve plate, the driving rod, the guide plate and the output shaft.

4. The precast beam lifting system of claim 1, wherein: When the pressure pushes the pilot valve plate to move right to the open position, the pilot cavity is communicated with the left cavity through the upper through hole and communicated with the outlet through the first pressure relief hole.

5. A precast beam lifting system as claimed in claim 4, wherein: When the pressure in the left cavity increases, the disc is pushed to move right to abut against the pilot valve seat, and the pressure maintaining plate is moved to the open position, so that the lower through hole is in fluid communication with the second pressure relief hole.

6. A precast beam lifting system as claimed in claim 1, wherein: The pilot flow path is not communicated with the lower control cavity.

7. A precast beam lifting system as claimed in claim 4, wherein: The first pressure relief hole is not communicated with the lower control cavity.

8. The precast beam lifting system of claim 1, wherein: The driving device is an electromagnetic driving device.

9. The precast beam lifting system of claim 1, wherein: The shunt path comprises a branch upstream section, a buffer cavity and a branch downstream section communicated in sequence, and the branch upstream section is connected to the lower part of the buffer cavity.

10. The precast beam lifting system of claim 1, wherein: The lower through hole is always communicated with the right cavity.

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