A bogie drive device

Abstract

A trolley driving device includes a walking frame, a motor, a reduction mechanism, and wheels; at the bottom of one end of the walking frame, two wheels are rotatably connected at intervals, and an articulated mounting hole for corresponding articulation with the corresponding legs of the trolley is provided above the walking frame corresponding to the two wheels; a motor is installed at the other end of the walking frame, and a reduction mechanism corresponding to the output shaft of the motor is provided inside this end of the walking frame; the output shaft of the reduction mechanism is correspondingly connected to the adjacent wheel for transmission; the structure of the present invention is simple, the reduction mechanism is installed inside the walking frame, which can improve the stress condition of the walking frame, and an overload protection device for protecting the reduction mechanism and the motor is provided between the output shaft of the reduction mechanism and the adjacent wheel. When the transmission is overloaded, the reduction mechanism and the motor can be prevented from being damaged; a braking mechanism is provided at the position inside the walking frame corresponding to the two wheels to prevent the risk of running away when the reduction mechanism or the motor brake fails.

Description

Technical Field

[0001] The present invention relates to the technical field of tunnel jumbo, and in particular to a jumbo driving device. Background Art

[0002] As is known, during tunnel construction, a jumbo is an indispensable construction platform and tunnel formwork support; usually, the jumbo needs to bear a weight of dozens of tons or even hundreds of tons, so multiple legs are provided on both sides thereof, and a driving device for traveling along a track is provided at the bottom of the legs. The driving device includes a traveling frame, a driving wheel and a driven wheel, and the leg is hinged at a position corresponding to the driving wheel and the driven wheel of the traveling frame;

[0003] Most of the existing jumbo driving devices install a motor and a speed reducer at the top end of one side of the traveling frame, and the output shaft of the speed reducer is connected to the driving wheel by chain drive. Although this structure can directly purchase a speed reducer and reduce the assembly difficulty, it is found in the long-term use process that when the speed reducer drives the driving wheel, it applies pressure to the top of the traveling frame, which is likely to cause deformation or damage to the traveling frame; in order to avoid interference with the legs, the speed reducer needs to be far away from the legs, extending the length of the traveling frame and increasing the overall volume of the driving device;

[0004] At the same time, a problem that has always troubled the industry is that due to the large self-weight of the jumbo, a large starting torque is required, and there is no overload protection mechanism in the transmission chain of the existing driving device. Due to its harsh working environment, the existing friction type overload protection mechanism and constant torque type overload protection mechanism are difficult to operate normally for a long time; or an electronic overload protection device is added at the motor end, but it can only protect the motor, and there is no protection measure between the speed reducer and the driving wheel. During tunnel construction, problems such as chain breakage and speed reducer damage often occur, seriously delaying the project deadline. The above defects are problems that need to be solved urgently by those skilled in the art;

[0005] In addition, due to the size limitation of the traveling frame of the existing driving device, it is difficult to directly brake the driving wheel or the driven wheel. Most of them rely on the motor brake to achieve braking. If the speed reducer is damaged or the chain is broken, there is a high risk of the jumbo slipping, and the safety hazard is relatively large;

[0006] A Chinese patent (publication number: CN106567720A) discloses a travel control device and control method for a tunnel lining formwork trolley. This patent detects the torque on the reducer input shaft using a torque sensor installed between the left and right drive motors and the reducer. The tension on the chains connected between the reducer output shaft and the driving wheel on the left and right sides is calculated based on the reducer's transmission ratio and the radius of the reducer output shaft sprocket. The angles of rotation of the left and right driven wheels are detected by encoders installed on the left and right traveling frames and connected to the wheel shafts. The controller receives the collected torque and angle signals and controls the left and right drive motors by comparing them with set values. Although this patent can prevent chain breakage, the reducer is located at the top of one end of the traveling frame, which can easily cause deformation or damage to the traveling frame. The drive device is bulky and occupies a large space.

[0007] A Chinese patent (publication number: CN111980728A) discloses a tunnel drainage board laying trolley. Combined with Figures 7 and 8 of its specification, it can be seen that its travel reduction motor is arranged on the upper part of the travel mechanism, which also has the problem of easily causing deformation or damage to the travel mechanism, and the drive device is large in size and occupies a large space. Summary of the Invention

[0008] In order to overcome the deficiencies in the background technology, the present invention discloses a trolley driving device.

[0009] In order to achieve the above-mentioned object of the invention, the present invention adopts the following technical solutions:

[0010] A trolley drive device comprises a walking frame, a motor, a reduction mechanism, and wheels; two wheels are rotatably connected to the bottom of one end of the walking frame, and a hinged mounting hole for corresponding hinge connection to the corresponding legs of the trolley is provided above the two wheels of the walking frame; a motor is installed at the other end of the walking frame, and a reduction mechanism is provided in this end of the walking frame that is transmission-connected to the output shaft of the motor; the output shaft of the reduction mechanism is transmission-connected to the adjacent wheels, and an overload protection device for protecting the reduction mechanism and the motor is provided between the output shaft of the reduction mechanism and the adjacent wheels.

[0011] Preferably, the overload protection device includes a driven wheel that is coaxially connected to the output shaft of the reduction mechanism for rotation; a groove is coaxially provided on one side of the driven wheel, and the output shaft of the reduction mechanism is coaxially and tightly connected to the driving wheel at a position corresponding to the groove, and the diameter of the driving wheel is smaller than the diameter of the groove; a plurality of easy-to-break keys are arranged at intervals along the circumferential direction between the inner wall of the groove and the driving wheel, and the easy-to-break keys are provided with easy-to-break grooves at positions corresponding to the gaps between the inner wall of the groove and the outer circle of the driving wheel; a retaining spring is provided on the side of the output shaft of the reduction mechanism corresponding to the driven wheel away from the driving wheel to prevent the driven wheel from axial movement; the driven wheel is transmission-connected to the adjacent wheel.

[0012] Preferably, fracture grooves are provided on both sides of the key body of the breakable key.

[0013] Preferably, a braking mechanism is provided at a position corresponding to the space between two wheels within the traveling frame.

[0014] Preferably, the braking mechanism includes a frame-shaped fixing bracket, both sides of the fixing bracket are fixedly connected to the inner wall of the traveling frame, braking plates are symmetrically provided at both ends of the fixing bracket, and a connecting shaft is movably inserted through the braking plates; a cam for making the braking plates contact the corresponding wheels is rotatably connected at a position corresponding to the space between two connecting shafts within the fixing bracket, and one end of the camshaft of the cam extends out of the fixing bracket movably.

[0015] Preferably, a handwheel or a rocker arm for driving the cam to rotate is detachably connected to the extending end of the camshaft of the cam.

[0016] Preferably, a threaded hole is provided at one end of the connecting shaft corresponding to the cam, and a plug for adjusting the length of the connecting shaft is threadedly connected at a position corresponding to the threaded hole, and the diameter of the end of the plug corresponding to the cam is larger than the diameter of the connecting shaft.

[0017] Preferably, a spring for making the braking plate and the corresponding end of the fixing bracket fit correspondingly is sleeved on the connecting shaft.

[0018] Preferably, an arc-shaped brake shoe for frictionally contacting the corresponding wheel is provided on one side of the braking plate away from the fixing bracket.

[0019] Preferably, the speed reduction mechanism includes a worm and worm gear speed reduction device and a gear speed reduction device that are correspondingly connected in transmission, and the output shaft of the motor is coaxially and fixedly connected to the worm of the worm and worm gear speed reduction device; the gear speed reduction device is respectively connected in transmission with the adjacent wheel and between the two wheels through chain transmission mechanisms.

[0020] Due to the adoption of the above technical solutions, the present invention has the following beneficial effects:

[0021] A trolley driving device disclosed by the present invention has a simple structure, is easy to assemble, has a relatively low production cost, the speed reduction mechanism is installed inside the traveling frame, which can improve the stress condition of the traveling frame, effectively avoid the problem that the speed reduction mechanism acts on the top of the traveling frame, resulting in easy deformation of the traveling frame, and at the same time avoid the interference between the speed reduction mechanism and the trolley legs, thereby effectively reducing the length dimension of the traveling frame, reducing the overall volume, and having a compact layout;

[0022] An overload protection device for protecting the reduction mechanism and the motor is provided between the output shaft of the reduction mechanism and the adjacent wheel. The overload protection device includes a driving wheel and a driven wheel. The output shaft of the reduction mechanism drives the driving wheel, and the driving wheel drives the driven wheel through a shear key that is prone to breakage. The driven wheel outputs power. Since the maximum torque that the shear key can withstand can be determined, shear slots can be provided on the body of the shear key according to technical requirements. When the transmission is overloaded, the shear key breaks at the shear slot, so that the driving wheel and the driven wheel can rotate relative to each other, avoiding damage to the reduction mechanism and the motor.

[0023] A braking mechanism is provided at a position corresponding to the two wheels in the walking frame. The two wheels are braked through the braking mechanism to prevent the risk of vehicle slipping when the reduction mechanism or the motor brake fails. Brief Description of the Drawings

[0024] Figure 1 is a schematic structural diagram of the present invention;

[0025] Figure 2 is a top view of the present invention;

[0026] Figure 3 is a schematic structural diagram of the reduction mechanism;

[0027] Figure 4 is a partial structural diagram of the overload protection device;

[0028] Figure 5 is a partial side view of the overload protection device;

[0029] Figure 6 is a schematic structural diagram of the braking mechanism.

[0030] In the figure: 1, walking frame; 2, motor; 3, reduction mechanism; 3-1, worm and worm gear reduction device; 3-2, gear reduction device; 4, wheel; 5, hinge mounting hole; 6, overload protection device; 6-1, driving wheel; 6-2, driven wheel; 6-3, shear key; 6-4, shear slot; 6-5, snap ring; 7, braking mechanism; 7-1, fixing bracket; 7-2, brake plate; 7-3, connecting shaft; 7-4, spring; 7-5, arc brake shoe; 7-6, cam; 7-7, plug. Embodiment

[0031] The present invention can be explained in detail through the following embodiments. The purpose of disclosing the present invention is to protect all technical improvements within the scope of the present invention. In the description of the present invention, it should be understood that if there are terms such as "upper", "lower", "front", "rear", "left", "right", etc. indicating the orientation or position relationship, it is only corresponding to the drawings of the present application for the convenience of describing the present invention, rather than indicating or implying that the device or element referred to must have a specific orientation.

[0032] Embodiment 1, in conjunction with the attached Figures 1 - 2 , a trolley driving device, comprising a walking frame 1, a motor 2, a speed reduction mechanism 3, and wheels 4; at the bottom of one end of the walking frame 1, two wheels 4 are rotatably connected at intervals, and above the walking frame 1 between the two wheels 4, there is a hinge mounting hole 5 for corresponding hinge connection with the corresponding leg of the trolley; at the other end of the walking frame 1, a motor 2 is installed, and inside this end of the walking frame 1, there is a speed reduction mechanism 3 corresponding to the output shaft of the motor 2 for transmission connection. The speed reduction mechanism 3 is installed inside the walking frame 1, which can improve the stress condition of the walking frame 1, effectively avoid the problem that the speed reduction mechanism 3 acts on the top of the walking frame 1, resulting in easy deformation of the walking frame 1, and at the same time avoid interference between the speed reduction mechanism 3 and the trolley leg, thereby effectively reducing the length dimension of the walking frame 1, reducing the overall volume, and having a compact layout;

[0033] The output shaft of the speed reduction mechanism 3 is corresponding to the adjacent wheel 4 for transmission connection, and between the output shaft of the speed reduction mechanism 3 and the adjacent wheel 4, there is an overload protection device 6 for protecting the speed reduction mechanism 3 and the motor 2, which can effectively avoid damage to the speed reduction mechanism 3 or transmission failure between the output shaft of the speed reduction mechanism 3 and the adjacent wheel 4;

[0034] Preferably, the speed reduction mechanism 3 comprises a worm and worm gear reduction device 3-1 and a gear reduction device 3-2 corresponding to transmission connection. The output shaft of the motor 2 is coaxially and firmly connected with the worm of the worm and worm gear reduction device 3-1, with a large transmission torque and small occupied space; between the gear reduction device 3-2 and the adjacent wheel 4 and between the two wheels 4, they are respectively connected by a chain transmission mechanism, with a small assembly difficulty, can cope with a harsh operating environment, and is convenient and fast for later maintenance.

[0035] Embodiment 2, in conjunction with the attached Figures 1 - 5, a trolley drive device, which is different from the embodiment 1 in that, on the basis of the embodiment 1, the overload protection device 6 includes a driven wheel 6-2 that is coaxially connected to the output shaft of the reduction mechanism 3 for rotation; a groove is coaxially provided on one side of the driven wheel 6-2, and the output shaft of the reduction mechanism 3 is coaxially and tightly connected to the driving wheel 6-1 at the position of the groove, and the diameter of the driving wheel 6-1 is smaller than the diameter of the groove; a plurality of easily breakable keys 6-3 are arranged at intervals along the circumferential direction between the inner wall of the groove and the driving wheel 6-1, and the key body of the easily breakable key 6-3 is provided with an easily breakable groove 6-4 at the position of the gap between the inner wall of the groove and the outer circle of the driving wheel 6-1, that is, the output shaft of the reduction mechanism 3 drives the driving wheel 6-1, and the main The driving wheel 6-1 drives the driven wheel 6-2 through the easy-break key 6-3, and the driven wheel 6-2 outputs the power. Since the maximum torque that the easy-break key 6-3 can withstand can be determined, an easy-break groove 6-4 can be provided on the key body of the easy-break key 6-3 according to technical requirements. When the transmission is overloaded, the easy-break key 6-3 breaks from the easy-break groove 6-4, so that the driving wheel 6-1 and the driven wheel 6-2 can rotate relative to each other, avoiding damage to the reduction mechanism 3; as needed, easy-break grooves 6-4 are provided on both sides of the key body of the easy-break key 6-3, which can ensure that the easy-break key 6-3 can be disconnected in time during overload operation, whether it is forward transmission or reverse transmission, to protect the reduction mechanism 3 and the motor 2;

[0036] The output shaft of the reduction mechanism 3 is provided with a retaining spring 6-5 on the side of the driven wheel 6-2 away from the driving wheel 6-1 to prevent the driven wheel 6-2 from axial movement; the driven wheel 6-2 is connected to the adjacent wheel 4 in transmission connection, that is, the adjacent wheel 4 is driven by the driven wheel 6-2.

[0037] Example 3, combined with the attached Figures 1 - 6 A trolley drive device, based on embodiment one or two, a brake mechanism 7 is provided in the position corresponding to the position between the two wheels 4 in the walking frame 1, and the two wheels 4 are braked by the brake mechanism 7 to prevent the risk of slipping when the deceleration mechanism 3 or the motor 2 brake fails.

[0038] Example 4, combined with the attached Figures 1 - 6, a trolley drive device, based on the third embodiment, the brake mechanism 7 includes a frame-shaped fixed frame 7-1, the two sides of the fixed frame 7-1 are tightly connected to the inner wall of the walking frame 1, and brake plates 7-2 are symmetrically provided at both ends of the fixed frame 7-1. The brake plates 7-2 are provided with a connecting shaft 7-3 that movably passes through the fixed frame 7-1; a cam 7-6 for making the brake plates 7-2 contact the corresponding wheels 4 is rotatably connected to the position between the two connecting shafts 7-3 in the fixed frame 7-1, and one end of the wheel shaft of the cam 7-6 movably extends out of the fixed frame 7-1; the cam 7-6 can be pushed out of the connecting shaft 7-3 by rotation. When braking is needed, the cam 7-6 is driven to rotate by the protruding end of the wheel shaft of the cam 7-6, The connecting shaft 7-3 is pushed out by the cam 7-6, and the connecting shaft 7-3 pushes the brake plate 7-2 to contact the corresponding wheel 4, thereby achieving braking. At the same time, the cam 7-6 is an elliptical structure with flat surfaces at both ends. When the flat surfaces at both ends of the cam 7-6 contact the corresponding connecting shaft 7-3, they can achieve self-locking, thereby maintaining the brake; when it is necessary to unlock the brake, the cam 7-6 is driven to rotate, ending the contact with the corresponding connecting shaft 7-3, thereby releasing the brake plate 7-2, and the braking effect can be unlocked; according to needs, the protruding end of the wheel axle of the cam 7-6 can be detachably connected to a handwheel or rocker arm for driving the cam 7-6 to rotate, that is, the cam 7-6 can be driven to rotate by the handwheel or rocker arm, which has a simple structure and is easy to control.

[0039] Example 5, combined with the attached Figures 1 - 6 , a trolley drive device, based on the fourth embodiment, the connecting shaft 7-3 is provided with a threaded hole at one end corresponding to the cam 7-6, and a plug 7-7 for adjusting the length of the connecting shaft 7-3 is threadedly connected at the corresponding threaded hole position. The diameter of the end of the plug 7-7 corresponding to the cam 7-6 is larger than the diameter of the connecting shaft 7-3, which can prevent the cam 7-6 and the plug 7-7 from accidentally getting stuck; at the same time, the extension length of the connecting shaft 7-3 can be adjusted by screwing the plug 7-7, thereby ensuring that the two brake plates 7-2 can simultaneously contact the corresponding wheels 4, ensuring the braking effect, reducing the difficulty of assembly, and the wear of the brake plates 7-2 can be compensated by adjusting the plug 7-7, thereby improving the service life;

[0040] In addition, the connecting shaft 7-3 is provided with a spring 7-4 for making the brake plate 7-2 fit correspondingly with the corresponding end of the fixing frame 7-1, that is, when the brake is unlocked, the connecting shaft 7-3 can automatically retreat and reset under the action of the spring 7-4, so that the brake plate 7-2 is separated from the corresponding wheel 4; the brake plate 7-2 is provided with an arc-shaped brake shoe 7-5 on the side away from the fixing frame 7-1 that is in friction contact with the corresponding wheel 4. The arc-shaped brake shoe 7-5 can contact the surface of the corresponding wheel 4, increase the contact area, enhance the friction force, and further ensure the braking effect.

[0041] The parts not described in detail in the present invention are prior arts. For those skilled in the art, it is obvious that the present invention is not limited to the details of the above-mentioned exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting, aiming to encompass all changes falling within the meaning and scope of the equivalent elements in the present invention.

Claims

1. A trolley drive device, characterized in that: The invention comprises a walking frame (1), a motor (2), a reduction mechanism (3), and wheels (4); the bottom of one end of the walking frame (1) is connected to two wheels (4) at intervals, and a hinge mounting hole (5) for corresponding hinge connection with the corresponding legs of the trolley is provided above the walking frame (1) between the two wheels (4); the other end of the walking frame (1) is installed with a motor (2), and the walking frame (1) is provided with a reduction mechanism (3) in a transmission connection with the output shaft of the motor (2); the output shaft of the reduction mechanism (3) is correspondingly connected to the adjacent wheels (4), and an overload protection device (6) for protecting the reduction mechanism (3) and the motor (2) is provided between the output shaft of the reduction mechanism (3) and the adjacent wheels (4); The overload protection device (6) comprises a driven wheel (6-2) coaxially connected to the output shaft of the reduction mechanism (3); a groove is coaxially provided on one side of the driven wheel (6-2); the output shaft of the reduction mechanism (3) is coaxially connected to the driving wheel (6-1) at a position corresponding to the groove, and the diameter of the driving wheel (6-1) is smaller than the diameter of the groove; a plurality of easily breakable keys (6-3) are arranged at intervals along the circumferential direction between the inner wall of the groove and the driving wheel (6-1); the key body of the easily breakable key (6-3) is provided with an easily breakable groove (6-4) at a position corresponding to the gap between the inner wall of the groove and the outer circle of the driving wheel (6-1); a retaining spring (6-5) is provided on the output shaft of the reduction mechanism (3) at a side corresponding to the driven wheel (6-2) away from the driving wheel (6-1) to prevent the driven wheel (6-2) from axial movement; the driven wheel (6-2) is transmission-connected to the adjacent wheel (4); a brake mechanism (7) is provided at a position corresponding to between the two wheels (4) in the walking frame (1); The brake mechanism (7) comprises a frame-shaped fixing frame (7-1), both sides of which are tightly connected to the inner wall of the walking frame (1), brake plates (7-2) being symmetrically provided at both ends of the fixing frame (7-1), and the brake plates (7-2) being provided with a connecting shaft (7-3) that movably passes through the fixing frame (7-1); a cam (7-6) for causing the brake plates (7-2) to contact the corresponding wheels (4) is rotatably connected at positions corresponding to the positions between the two connecting shafts (7-3) in the fixing frame (7-1), and one end of the wheel shaft of the cam (7-6) movably extends out of the fixing frame (7-1).

2. The trolley drive device according to claim 1, characterized in that: Both sides of the easy-to-break key (6-3) are provided with easy-to-break grooves (6-4).

3. The trolley drive device according to claim 1, characterized in that: The protruding end of the wheel shaft of the cam (7-6) is detachably connected to a hand wheel or a rocker arm for driving the cam (7-6) to rotate.

4. The trolley drive device according to claim 1, characterized in that: One end of the connecting shaft (7-3) corresponding to the cam (7-6) is provided with a threaded hole, and a plug (7-7) for adjusting the length of the connecting shaft (7-3) is threadedly connected at the position corresponding to the threaded hole. The diameter of one end of the plug (7-7) corresponding to the cam (7-6) is larger than the diameter of the connecting shaft (7-3).

5. The trolley drive device according to claim 4, characterized in that: The connecting shaft (7-3) is sleeved with a spring (7-4) for causing the brake plate (7-2) and the corresponding ends of the fixing frame (7-1) to fit in correspondence.

6. The trolley drive device according to claim 1, characterized in that: A side of the brake plate (7-2) facing away from the fixing frame (7-1) is provided with an arc-shaped brake shoe (7-5) that is in frictional contact with the corresponding wheel (4).

7. The bogie drive device according to any one of claims 1 to 6, characterized in that: The reduction mechanism (3) comprises a worm gear reduction device (3-1) and a gear reduction device (3-2) in corresponding transmission connection; the output shaft of the motor (2) is coaxially and tightly connected to the worm of the worm gear reduction device (3-1); the gear reduction device (3-2) and the adjacent wheels (4) and the two wheels (4) are respectively connected through chain transmission mechanisms.

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