A hydraulic control device for overhead crane

Abstract

A hydraulic control device for an overhead crane 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 drive device, an upper control chamber, a pilot valve plate, a drive 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 through hole; wherein an upper chamber spring is arranged in the upper chamber, the piston plate is arranged below the upper chamber spring, the piston plate is connected to the piston rod below, and the piston rod is connected to the valve core below.

Description

Technical Field

[0001] The present invention relates to the field of land and sea bridge construction, and in particular to a hydraulic control device for an overhead crane. Background Art

[0002] During the construction of land and sea bridges, a bridge crane is generally required. A bridge crane that runs on an elevated track is also called an overhead crane. It can run longitudinally on the elevated tracks on both sides without being hindered by ground equipment. It is the most widely used and largest type of lifting machinery. Overhead cranes often use winches to lift prefabricated beams, where the winches are controlled by a series of hydraulic control equipment. At the same time, during the construction process, it is necessary to monitor and warn the deformation and displacement of each component during the operation of the bridge crane, and at the same time, real-time monitoring of offshore wind speed, beam lifting, transportation, and beam deflection and position offset during the operation of the bridge crane.

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

[0004] 1. The hydraulic control equipment for overhead crane hoisting in the prior art includes a relief valve. When the control pressure is too high, in order to avoid sudden impact of the fluid, a relief valve is set to guide the excessive pressure back to the oil. The existing relief valve controls the preload force through a spring. However, when the length of a single spring is too long, it is easy to bend or deviate, resulting in a decrease in service life.

[0005] Second, the hydraulic control equipment for overhead crane lifting in the prior art controls the preload force through a spring. However, the spring has a limited service life and cannot be repaired or replaced in real time after being damaged or expired. If the spring needs to be removed, since the spring is connected to the passage and plays a control function, the entire system needs to be shut down for removal and maintenance.

[0006] 3. The hydraulic control equipment for overhead crane lifting in the prior art pushes the valve core open through the pressure difference between the upper and lower chambers of the valve core to achieve overflow, pushes open the pilot valve plate through pressure and finally achieves pressure relief in the upper chamber. However, the liquid in the upper chamber is replenished at any time and the overall liquid volume will not decrease rapidly. Therefore, the pressure in the upper chamber will not drop in time, resulting in a slower valve core pushing speed.

[0007] 4. In the hydraulic control equipment for overhead crane lifting in the prior art, when the valve core is lifted slowly, there is a small gap between the valve core and the valve seat, and the liquid flow area is rapidly reduced, which may cause shaking or weak whistling.

[0008] 5. The hydraulic control equipment for overhead crane hoisting in the prior art has a flow passage with a uniform flow area and cannot adapt to multifunctional applications or various environments. Summary of the invention

[0009] In order to overcome the above problems, the present invention proposes a solution to solve the above multiple problems at the same time.

[0010] The technical solution adopted by the present invention to solve its technical problem is: a hydraulic control device for a crane, including 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 holding plate, a disc, a piston plate, a piston rod, a valve core, a second pressure relief hole, a lower through hole, and a perforation;

[0011] An upper chamber spring is provided in the upper chamber, a piston plate is provided below the upper chamber spring, the piston plate is connected to the piston rod below, and the piston rod is connected to the valve core below; 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, the other end of the guide plate is connected to one end of the driving rod, and 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 chamber forms the pilot chamber;

[0012] The pilot valve seat is provided in the lower control chamber, the left side of the pilot valve seat constitutes a left chamber, the right side of the pilot valve seat and the pressure-maintaining plate constitute a right chamber, the disc is provided in the left chamber, the disc is provided with the perforation, 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, 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; 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 presses against the second spring; the spring coefficient of the first spring is greater than the spring coefficient of the second spring;

[0013] The right chamber is connected to the upper chamber through the lower through hole. When the valve core opens the inlet, the inlet is connected to a shunt path, in which the buffer cavity is provided. The shunt path is connected to the outlet after passing through the buffer cavity.

[0014] Furthermore, a positioning structure is provided on the outer periphery of the connecting rod to enable the connecting rod to move stably in the lower control cavity.

[0015] Furthermore, the pilot valve plate, the drive rod, the guide plate and the output shaft are provided in the upper control chamber.

[0016] Furthermore, when the pressure pushes the pilot valve plate to move rightward to an open position, the pilot chamber is connected to the left chamber through the upper through hole, and is connected to the outlet through the first pressure relief hole.

[0017] Furthermore, when the pressure in the left chamber increases, the disc is pushed to move rightward and abut against the pilot valve seat, and the pressure-maintaining plate is moved to an open position, so that the lower through hole and the second pressure relief hole are fluidically connected.

[0018] Further, the pilot flow path is not connected to the lower control chamber.

[0019] Furthermore, the first pressure relief hole is not connected to the lower control chamber.

[0020] Furthermore, the driving device is an electromagnetic driving device.

[0021] Furthermore, the shunt path includes a branch upstream section, a buffer chamber, and a branch downstream section which are connected in sequence, and the path where the branch upstream section is located is connected to the lower part of the buffer chamber.

[0022] Furthermore, the lower through hole is always connected to the right cavity.

[0023] The beneficial effects of the present invention are:

[0024] 1. Regarding the first point raised in the background technology, through the combination of 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 spring coefficient of the outer spring can be smaller, so that the shorter inner spring can provide more elastic force and provide preload in time; and the outer spring can provide more stroke coverage to provide buffering force at the same time.

[0025] 2. In response to the second point raised in the background technology, a fixed spring and a removable spring are set. The internal spring is a fixed spring, which is enclosed in an annular seat to provide a relatively fixed setting; the external spring is located outside the annular seat, and the external spring can be replaced after removing the plug cover. At this time, the internal spring can continue to provide a relatively stable spring preload force, and the pressure maintaining 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 also provide a relatively stable spring force for temporary work, thereby adapting to rapid replacement during the work process.

[0026] 3. The third point raised in relation to background technology

[0027] 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. Therefore, after the pressure in the upper chamber flows into the pressure relief channel, it will not be replenished in large quantities subsequently.

[0028] 2) At the same time, in order to prevent the pressure in the upper chamber from being too low, a through-flow hole is set on the circular plate. Even if the circular plate contacts the pilot valve seat, the fluid will enter the upper chamber through the through-flow hole, thereby providing a small flow of fluid supplement in the upper chamber, which neither provides excessive pressure to affect the opening of the upper chamber nor prevents the upper chamber pressure from being too low to be buffered.

[0029] 4. In response to the fourth point raised in the background technology, a bypass 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 released through bypass, thereby avoiding the phenomenon of pressure release due to too small a gap.

[0030] 5. In response to the fifth point of the background technology, the channels in the valve body are cleverly arranged, and sufficient valve body space is reserved to set up a buffer chamber. The buffer chamber is arranged in the diversion pressure relief channel. The buffer chamber provides sufficient buffer space. The lateral pressure relief channel is connected to the lower part of the buffer chamber, so that the fluid in the buffer chamber can be retained.

[0031] Note: The above designs are not listed in any particular order, and each one makes the present invention distinctive and significantly advanced compared to the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0033] Figure 1 This is a schematic diagram of the closed state of the device of the present invention

[0034] Figure 2 This is a schematic diagram of the device in the open state of the present invention

[0035] Figure 3 Schematic diagram of the circular plate structure of the present invention

[0036] Figure 4 This is a schematic diagram of the spring module structure of the present invention.

[0037] In the figure, the reference numerals are as follows:

[0038] 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. Drive device 16. Pilot valve plate 17. Upper control chamber 18. Drive 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 holding plate 29. Disc 30. Piston plate 31. Piston rod 32. Valve core 33. Second pressure relief hole 34. Through hole 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. DETAILED DESCRIPTION

[0039] As shown in the figure: a hydraulic control device for a crane, including 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 holding plate, a disc, a piston plate, a piston rod, a valve core, a second pressure relief hole, a lower through hole, and a perforation;

[0040] An upper chamber spring is provided in the upper chamber, a piston plate is provided below the upper chamber spring, the piston plate is connected to the piston rod below, and the piston rod is connected to the valve core below; 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, the other end of the guide plate is connected to one end of the driving rod, and 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 chamber forms the pilot chamber;

[0041] The pilot valve seat is provided in the lower control chamber, the left side of the pilot valve seat constitutes a left chamber, the right side of the pilot valve seat and the pressure-maintaining plate constitute a right chamber, the disc is provided in the left chamber, the disc is provided with the perforation, 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, 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; 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 presses against the second spring; the spring coefficient of the first spring is greater than the spring coefficient of the second spring;

[0042] The right chamber is connected to the upper chamber through the lower through hole. When the valve core opens the inlet, the inlet is connected to a shunt path, in which the buffer cavity is provided. The shunt path is connected to the outlet after passing through the buffer cavity.

[0043] As shown in the figure: a positioning structure is provided on the periphery of the connecting rod so that the connecting rod can move stably in the lower control chamber. The pilot valve plate, the drive rod, the guide plate and the output shaft are provided in the upper control chamber. The pilot flow path is not connected to the lower control chamber. The first pressure relief hole is not connected to the lower control chamber. The driving device is an electromagnetic driving device. The shunt path includes a branch upstream section, a buffer chamber and a branch downstream section which are connected in sequence, and the passage where the branch upstream section is located is connected to the lower part of the buffer chamber. The lower through hole is always connected to the right chamber.

[0044] The working principle is as follows: when the inlet pressure is too large, the pressure pushes the pilot valve plate to overcome the driving force and move to the right to the open position, and the pilot chamber is connected to the left chamber through the upper through hole, and is connected to the outlet through the first pressure relief hole. When the pressure in the left chamber increases, the disc is pushed to move to the right and abut against the pilot valve seat, and the pressure-maintaining plate is moved to the open position, so that the fluid between the lower through hole and the second pressure relief hole is connected; thereby, the pressure in the upper chamber is released, and the inlet pressure pushes the valve core to move the piston upward.

[0045] The above detailed description is a specific description of a feasible embodiment of the present invention. The embodiment is not intended to limit the patent scope of the present invention. Any equivalent implementation or modification that does not deviate from the present invention should be included in the patent scope of this case.

Claims

1. A liquid control device for a crane, characterized in that: it includes 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 retaining plate, a disc, a piston plate, a piston rod, a valve core, a second pressure relief hole, a lower through hole, a perforation; wherein an upper chamber spring is arranged in the upper chamber, the piston plate is arranged 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 communicates with one end of the pilot flow path, and the other end of the pilot flow path communicates with the pilot chamber; the pilot valve plate, the driving rod, the guide plate and the output shaft are arranged in the upper control 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, the other end of the guide plate is connected to one end of the driving rod, 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 chamber forms the pilot chamber; the pilot valve seat is arranged in the lower control chamber, the left side of the pilot valve seat constitutes the left chamber, and the right chamber is formed between the right side of the pilot valve seat and the pressure retaining plate. The disc is arranged in the left chamber, 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 retaining plate through the connecting rod, and the spring module is arranged at the other end of the pressure retaining plate. The spring module includes a first plate, a first spring, a second plate, a spring rod, an annular seat, a second spring and a plug; 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 chamber is connected to the upper chamber through the lower through hole. When the valve core opens the inlet, the inlet communicates with a shunt path, a buffer chamber is arranged in the shunt path, and the shunt path communicates with the outlet after passing through the buffer chamber; when the pressure pushes the pilot valve plate to move rightward to the open position, the pilot chamber communicates with the left chamber through the upper through hole and communicates with the outlet through the first pressure relief hole; when the pressure in the left chamber increases, it pushes the disc to move rightward and abut against the pilot valve seat, and makes the pressure retaining plate move to the open position, so that the fluid communication between the lower through hole and the second pressure relief hole is established; the lower through hole and the right chamber are kept in constant communication.

2. The liquid control device for a crane according to claim 1, characterized in that: a positioning structure is arranged on the outer periphery of the connecting rod so that the connecting rod moves stably in the lower control chamber.

3. The liquid control device for a crane according to claim 1, characterized in that: the pilot flow path is not communicated with the lower control chamber.

4. The hydraulic control device for an overhead crane according to claim 1, Features: The first pressure relief hole is not in communication with the lower control chamber.

5. The hydraulic control device for an overhead crane according to claim 1, Features: The driving device is an electromagnetic driving device.

6. The hydraulic control device for an overhead crane according to claim 1, Features: The shunt path includes a branch upstream section, a buffer cavity, and a branch downstream section which are connected in sequence, and the path where the branch upstream section is located is connected to the lower part of the buffer cavity.

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