Bridge crane lifting two-stage speed reducer

Abstract

The present application relates to the field of wharf bridge crane, and particularly relates to a two-stage speed reduction device for hoisting of a bridge crane, comprising a frame, a steel cable for hoisting goods arranged on the frame, a winding roller for winding the steel cable, and a driving shaft for driving the winding roller to rotate, a brake disc fixedly arranged on the driving shaft, a first hydraulic cylinder arranged on the frame, and a brake block of the first hydraulic cylinder for braking the brake disc; further comprising a first driving assembly for driving the first hydraulic cylinder to move along the radial line direction of the brake disc, and a first reset assembly for driving the first driving assembly to reset, a driving wheel fixedly arranged on the driving shaft, and a driving gear rotatably connected to the driving wheel and used for driving the first driving assembly to work; the present application aims to overcome the shortcomings of the prior art and provide a two-stage speed reduction device for hoisting of a bridge crane, which can brake the goods at a speed according to the hoisting speed of the goods to ensure the safety of hoisting of the goods.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of wharf bridge cranes, in particular, to a two-stage speed reduction device for lifting a bridge crane. BACKGROUND

[0002] The bridge crane trolley is also known as a portal crane, which is mainly used for lifting goods and is usually arranged near a wharf. Since the lifting hook is large in size and heavy in weight, and the lifting steel rope has a large swing, the lifting hook is prone to colliding with on-site equipment or workers during on-site operation, which may cause safety accidents and damage to on-site facilities.

[0003] To this end, the skilled in the art have made a lot of research, and a lifting mechanism for a hook bridge crane is disclosed in patent CN107311064B, which comprises a winding drum, a motor and a speed reducer. The rotating shaft of the motor is connected with a motor transmission shaft through a half-tooth coupling. The winding drum is engaged with the speed reducer through a winding drum shaft gear. The motor transmission shaft and the winding drum shaft both extend out of the left end of the speed reducer. The speed reducer is internally provided with a clutch, and the extension ends of the motor transmission shaft and the winding drum shaft are respectively provided with a shaft brake wheel and a rolling brake wheel. A differential double braking mechanism is installed on the shaft brake wheel and the rolling brake wheel, so that the motor is more stable in the stopping state during lifting, and the swing of the steel cable caused by the braking force of the motor is avoided. At the same time, the double braking measures ensure the stability of braking and are more suitable for lifting heavy objects. However, the braking force is fixed when the motor wheel is braked, which is mainly used for stable braking. The time from the movement of the goods to the completion of the braking is short, and the impact on the steel cable during the braking process is large, which may damage the lifting steel cable or even cause it to break, and the braking process is not safe. Therefore, how to design a bridge crane trolley speed reduction device that can brake the goods according to the lifting speed of the goods during lifting to ensure the safety of the goods lifting still needs continuous research. SUMMARY

[0004] Therefore, the present application aims to overcome the shortcomings of the prior art and provide a two-stage speed reduction device for lifting a bridge crane, which can brake the goods according to the lifting speed of the goods during lifting to ensure the safety of the goods lifting.

[0005] To solve the above technical problems, the technical solution of the present application is as follows:

[0006] A two-stage speed reduction device for lifting a bridge crane comprises a rack, a steel cable for lifting goods arranged on the rack, a winding roller for winding the steel cable, and a drive shaft for driving the winding roller to rotate. A brake disc is fixedly arranged on the drive shaft. A brake block and a first hydraulic cylinder for driving the brake block to brake the brake disc are arranged on the rack.

[0007] Further comprising a first driving assembly for driving the first hydraulic cylinder to move along the radial direction of the brake disc and a first reset assembly for driving the first hydraulic cylinder to reset, a driving wheel is fixed on the driving shaft, a driving gear for driving the first driving assembly to work is rotatably connected on the driving wheel, and a clutch is movably arranged on the driving wheel;

[0008] When the rotating speed of the driving wheel is higher than the set value, the clutch is pressed against the driving gear under the centrifugal force of the driving wheel, the driving wheel drives the driving gear to rotate, and the first driving assembly drives the first hydraulic cylinder to move away from the center of the brake disc; when the rotating speed of the driving wheel is lower than the set value, the clutch is separated from the driving gear, and the first reset assembly drives the first hydraulic cylinder to reset.

[0009] Compared with the prior art, the present application has the following advantages:

[0010] When the winding roller needs to be braked, the first hydraulic cylinder drives the brake block to press against the brake disc, the friction force between the brake block and the brake disc is constant, the brake disc and the driving shaft decelerate at a constant acceleration, and the first hydraulic cylinder drives the brake block to move away from the center of the brake disc.

[0011] When the rotating speed of the driving wheel is higher than the set value, the clutch is pressed against the driving gear under the centrifugal force of the driving wheel, the driving wheel drives the driving gear to rotate, the driving gear drives the pull rope to move, and the pull rope drives the first hydraulic cylinder to move away from the center of the brake disc; with the movement of the first hydraulic cylinder, the first hydraulic cylinder drives the brake block to move to the edge of the brake disc, the friction force between the brake block and the brake disc is constant, the brake block gradually increases the brake torque on the brake disc, and the brake disc and the driving shaft decelerate at an increasing acceleration.

[0012] When the rotating speed of the driving wheel is lower than the set value, the clutch is separated from the driving gear, and the first reset assembly drives the first hydraulic cylinder to reset.

[0013] Through the above structure, the present application can adjust the deceleration degree of the winding roller according to the rotating speed of the winding roller, the deceleration efficiency of the winding roller is higher when the rotating speed of the winding roller is higher, and the deceleration efficiency of the winding roller is lower when the rotating speed of the winding roller is lower; the impact of the goods on the steel cable during braking is effectively reduced, and the service life of the deceleration mechanism, the steel cable and the lifting structure is improved.

[0014] Preferably, the first driving assembly comprises a driven gear, the driving gear is engaged with the driven gear, a driven shaft is fixed on the driven gear, the driven shaft is rotatably connected with the rack, and the driven shaft is fixedly connected with the pull rope.

[0015] Preferably, a clutch slot is vertically formed on the frame, and the driven shaft is in sliding connection with the clutch slot.

[0016] The driven shaft is connected with a second driving assembly for driving the driven gear to be separated from and engaged with the driving gear.

[0017] Preferably, the second driving assembly comprises a second hydraulic cylinder, the second hydraulic cylinder is fixedly connected with the frame, a fixing seat is connected with a hydraulic rod of the second hydraulic cylinder, and the fixing seat is in rotary connection with the driven shaft.

[0018] Preferably, the first reset assembly comprises a first spring, and two ends of the first spring are fixedly connected with the first hydraulic cylinder and the frame respectively.

[0019] When the driving force of the pull rope is less than the elastic force of the first spring, the first spring drives the first hydraulic cylinder to reset.

[0020] Preferably, a guide rod is arranged on the frame, and the first spring is sleeved outside the guide rod.

[0021] Preferably, the first spring is a compression spring.

[0022] Preferably, a sliding groove is formed on the driving wheel, the clutch member is in sliding connection with the sliding groove, and a second reset assembly for driving the clutch member to be separated from the driving gear is arranged between the driving wheel and the clutch member.

[0023] When the rotating speed of the driving wheel is higher than a set value, the clutch member is pressed against the driving gear under the centrifugal force of the driving wheel; and when the rotating speed of the driving wheel is lower than the set value, the second reset assembly drives the clutch member to be separated from the driving gear.

[0024] Preferably, the second reset assembly comprises a second spring, and two ends of the second spring are fixedly connected with the driving wheel and the clutch member respectively.

[0025] Preferably, the second spring is a tension spring. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 It is a schematic diagram of the overall structure of the present application;

[0027] Figure 2 It is a schematic diagram of the top view structure of the present application;

[0028] Figure 3 It is a schematic diagram of the front view structure of the present application;

[0029] Figure 4This is a cross-sectional view of the driven shaft according to Embodiment 1 of the present invention;

[0030] Figure 5 This is a cross-sectional structural schematic diagram of the driven shaft in the first state according to Embodiment 2 of the present invention;

[0031] Figure 6 This is a cross-sectional structural schematic diagram of the second state of the driven shaft in Embodiment 2 of the present invention;

[0032] Figure 7 This is a cross-sectional structural schematic diagram of the drive gear of the present invention.

[0033] Reference numerals: 10, frame; 11, drive shaft; 12, winding roller; 13, steel cable; 20, first hydraulic cylinder; 22, brake block; 23, guide rod; 24, first spring; 25, brake disc; 26, protective cover; 30, drive gear; 31, drive wheel; 32, slide groove; 33, second spring; 34, clutch; 40, second hydraulic cylinder; 41, clutch groove; 42, driven shaft; 43, driven gear; 44, pull rope. Detailed Implementation

[0034] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings, so that the technical solution of the present invention can be more easily understood and mastered.

[0035] Example 1:

[0036] like Figures 1 to 4 As shown, in order to decelerate and brake the cargo according to its lifting speed during hoisting to ensure the safety of cargo hoisting, this embodiment provides a two-stage deceleration device for bridge crane hoisting, including a frame 10. The frame 10 is provided with a steel cable 13 for hoisting cargo, a winding roller 12 for winding the steel cable 13, and a drive shaft 11 for driving the winding roller 12 to rotate. A brake disc 25 is fixed on the drive shaft 11. A protective cover 26 is fixed on the frame 10. The brake disc 25 is disposed inside the protective cover 26. The drive shaft 11 passes through the protective cover 26. A first hydraulic cylinder 20 and a guide rod 23 are provided on the frame 10. The guide rod 23 is arranged along the radial direction of the brake disc 25. The first hydraulic cylinder 20 is slidably connected to the guide rod 23. A brake block 22 for braking the brake disc 25 is fixed on the hydraulic rod of the first hydraulic cylinder 20.

[0037] It also includes a pull rope 44 for driving the first hydraulic cylinder 20 to move and a first spring 24 for driving it to reset. Specifically, the first spring 24 is a compression spring. The first spring 24 is sleeved on the outside of the guide rod 23. The two ends of the first spring 24 are fixedly connected to the first hydraulic cylinder 20 and the frame 10, respectively. When the driving force of the pull rope 44 is less than the elastic force of the first spring 24, the first spring 24 drives the first hydraulic cylinder 20 to reset.

[0038] It also includes a driven gear 43 that meshes with the driving gear 30, and a driven shaft 42 is fixedly mounted on the driven gear 43. The driven shaft 42 is fixedly connected to the pull rope 44.

[0039] The two ends of the pull rope 44 are fixedly connected to the first hydraulic cylinder 20 and the driven shaft 42 respectively. A drive wheel 31 is fixedly mounted on the drive shaft 11. The drive wheel 31 is connected to a drive gear 30. The drive gear 30 is rotatably connected to the drive wheel 31. A clutch 34 is movably mounted on the drive wheel 31.

[0040] When the rotational speed of the drive wheel 31 is higher than the set value, the clutch 34 presses against the drive gear 30 under the centrifugal force of the drive wheel 31. The drive wheel 31 drives the drive gear 30 and the driven gear 43 to rotate. The driven shaft 42 drives the pull rope 44 to move. The pull rope 44 pulls the first hydraulic cylinder 20 to move away from the center of the brake disc 25. When the rotational speed of the drive wheel 31 is lower than the set value, the clutch 34 disengages from the drive gear 30, and the first reset assembly drives the first hydraulic cylinder 20 to reset.

[0041] The driving gear 30 meshes with the driven gear 43, and the driven gear 43 is fixedly provided with a driven shaft 42. The driven shaft 42 is rotatably connected to the frame 10 and is fixedly connected to the pull rope 44.

[0042] When in use, when the winding roller 12 needs to be braked, the first hydraulic cylinder 20 drives the brake block 22 to press against the brake disc 25. Since the friction between the brake block 22 and the brake disc 25 is constant, the resistance torque of the brake block 22 on the brake disc 25 is constant, and the brake disc 25 and the drive shaft 11 decelerate at a constant acceleration.

[0043] When the rotating speed of the driving wheel 31 is higher than the set value, the clutch 34 is pressed against the driving gear 30 under the centrifugal force of the driving wheel 31, the driving wheel 31 drives the driving gear 30 to rotate, the driving gear 30 drives the driven gear 43 and the driven shaft 42 to rotate, the pull rope 44 is wound on the outside of the driven shaft 42, the driven shaft 42 drives the pull rope 44 to move, and the pull rope 44 pulls the first hydraulic cylinder 20 to move away from the center of the brake disc 25; with the movement of the first hydraulic cylinder 20, the brake block 22 is moved to the edge of the brake disc 25, and the resistance torque of the brake block 22 to the brake disc 25 gradually increases due to the constant friction between the brake block 22 and the brake disc 25, and the brake disc 25 and the driving shaft 11 are decelerated at an increasing acceleration.

[0044] When the rotating speed of the driving wheel 31 is lower than the set value, the clutch 34 is separated from the driving gear 30, and the first spring 24 drives the first hydraulic cylinder 20 to reset.

[0045] As shown in Figure 7 In order to connect the driving gear 30 and the driving wheel 31, a sliding groove 32 is formed on the driving wheel 31, the clutch 34 is slidably connected with the sliding groove 32, and a second spring 33 is arranged between the driving wheel 31 and the clutch 34 to drive the clutch 34 to separate from the driving gear 30, and specifically, the second spring 33 is a tension spring, and the two ends of the second spring 33 are fixedly connected with the driving wheel 31 and the clutch 34 respectively.

[0046] When the rotating speed of the driving wheel 31 is higher than the set value, the clutch 34 is pressed against the driving gear 30 under the centrifugal force of the driving wheel 31; and when the rotating speed of the driving wheel 31 is lower than the set value, the second spring 33 drives the clutch 34 to separate from the driving gear 30.

[0047] Specifically, when the clutch 34 is pressed against the driving gear 30, the clutch 34 is relatively fixed with the driving gear 30 through friction, and when the driving wheel 31 drives the driving gear 30 to rotate through the clutch 34, if the friction between the clutch 34 and the driving gear 30 cannot overcome the resistance of the driving gear 30, the driving wheel 31 drives the clutch 34 to slide and press against the driving gear 30.

[0048] Embodiment two:

[0049] The difference between this embodiment and embodiment one is whether the driven gear 43 and the driving gear 30 can be separated during the operation of the device.

[0050] As shown in Figure 5 stage Figure 6As shown, in order to adjust the braking state of the brake block 22 on the brake disc 25, a driven gear 43 for meshing with the driving gear 30 is also included. A driven shaft 42 is fixedly mounted on the driven gear 43. The driven shaft 42 is fixedly connected to the pull rope 44. A clutch groove 41 is vertically opened on the frame 10. The driven shaft 42 is slidably connected to the clutch groove 41.

[0051] It is worth noting that the portion of the driven shaft 42 in the clutch groove 41 can rotate and slide. The driven shaft 42 is connected to a second drive assembly for driving the driven gear 43 to separate and engage with the driving gear 30. The second drive assembly includes a second hydraulic cylinder 40, which is fixedly connected to the frame 10. Specifically, the hydraulic rod of the second hydraulic cylinder 40 is connected to a fixed seat, and the fixed seat is rotatably connected to the driven shaft 42.

[0052] The above are just typical examples of the present invention. In addition, the present invention may have many other specific embodiments. All technical solutions formed by equivalent substitution or equivalent transformation fall within the scope of protection claimed by the present invention.

Claims

1. A two-stage speed reduction device for a bridge crane hoist, comprising a frame (10) provided with a steel cable (13) for hoisting a load, a winding roller (12) for winding the steel cable (13) and a drive shaft (11) for driving rotation of the winding roller (12), characterized in that, The brake disc (25) is fixed on the driving shaft (11), the brake block (22) and the first hydraulic cylinder (20) for driving the brake block (22) to brake the brake disc (25) are arranged on the rack (10); The first driving assembly for driving the first hydraulic cylinder (20) to move along the radial direction of the brake disc (25) and the first reset assembly for driving the first hydraulic cylinder (20) to reset are further arranged, the driving wheel (31) is fixed on the driving shaft (11), the driving wheel (31) is rotatably connected with the driving gear (30) for driving the first driving assembly to work, the driving wheel (31) is movably provided with the clutch (34); When the rotating speed of the driving wheel (31) is higher than the set value, the clutch (34) is pressed against the driving gear (30) under the centrifugal force of the driving wheel (31), the driving wheel (31) drives the driving gear (30) to rotate, and the first driving assembly drives the first hydraulic cylinder (20) to move away from the center of the brake disc (25); when the rotating speed of the driving wheel (31) is lower than the set value, the clutch (34) is separated from the driving gear (30), and the first reset assembly drives the first hydraulic cylinder (20) to reset.

2. The two-stage speed reduction device for bridge crane hoisting according to claim 1, characterized in that: The first driving assembly comprises the driven gear (43), the driving gear (30) is engaged with the driven gear (43), the driven shaft (42) is fixed on the driven gear (43), the driven shaft (42) is rotatably connected with the rack (10), the driven shaft (42) is fixedly connected with the pull rope (44), and the pull rope (44) is used for driving the first hydraulic cylinder (20) to move.

3. The two-stage speed reduction device for bridge crane hoisting according to claim 2, characterized in that: The rack (10) is vertically provided with the clutch groove (41), and the driven shaft (42) is slidably connected with the clutch groove (41); The driven shaft (42) is connected with the second driving assembly for driving the driven gear (43) to be separated from and engaged with the driving gear (30).

4. The two-stage speed reduction device for bridge crane hoisting according to claim 3, characterized in that: The second driving assembly comprises the second hydraulic cylinder (40), the second hydraulic cylinder (40) is fixedly connected with the rack (10), the hydraulic rod of the second hydraulic cylinder (40) is connected with the fixed seat, and the fixed seat is rotatably connected with the driven shaft (42).

5. The two-stage speed reduction device for bridge crane hoisting according to any one of claims 2 to 4, characterized in that: The first reset assembly comprises the first spring (24), and the two ends of the first spring (24) are fixedly connected with the first hydraulic cylinder (20) and the rack (10) respectively; When the driving force of the pull rope (44) is smaller than the elastic force of the first spring (24), the first spring (24) drives the first hydraulic cylinder (20) to reset.

6. The two-stage speed reduction device for bridge crane hoisting according to claim 5, characterized in that: The rack (10) is provided with the guide rod (23), and the first spring (24) is sleeved on the outer side of the guide rod (23).

7. The two-stage reduction device for bridge crane hoisting according to claim 5, characterized in that: The first spring (24) is a compression spring.

8. The two-stage speed reduction device for bridge crane hoisting according to any one of claims 1 to 4, characterized in that: The driving wheel (31) is provided with the sliding groove (32), the clutch (34) is slidably connected with the sliding groove (32), and the second reset assembly for driving the clutch (34) to be separated from the driving gear (30) is arranged between the driving wheel (31) and the clutch (34). When the rotating speed of the driving wheel (31) is higher than a set value, the clutch (34) is pressed against the driving gear (30) under the centrifugal force of the driving wheel (31); when the rotating speed of the driving wheel (31) is lower than the set value, the second reset assembly drives the clutch (34) to be separated from the driving gear (30).

9. The two-stage speed reduction device for bridge crane hoisting according to claim 8, characterized in that: The second reset assembly comprises a second spring (33), and two ends of the second spring (33) are fixedly connected with the driving wheel (31) and the clutch (34) respectively.

10. The two-stage speed reduction device for bridge crane hoisting according to claim 9, characterized in that: The second spring (33) is a tension spring.

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