Speed reducer integrated with centrifugal braking function, linear driving device and lifting equipment

Abstract

The utility model relates to the technical field of speed reducing mechanisms, in particular to a speed reducer integrated with a centrifugal braking function, a linear driving device and lifting equipment. The protective cover is connected to the shell; the connecting shaft is coaxially connected with the rotating shaft of the speed reducing assembly; the balancing weight is in sliding connection with the connecting shaft in the radial direction of the connecting shaft, the balancing weight is located in the protective cover, the balancing weight is connected to a spring used for resetting the balancing weight, and the side wall, away from the connecting shaft, of the balancing weight is matched with the inner side wall of the protective cover; the linear driving device comprises an output mechanism, a motor and the speed reducer integrated with the centrifugal braking function, and the speed reducer integrated with the centrifugal braking function is connected between the motor and the output mechanism. And the lifting equipment takes the linear driving device as a driving source. The speed reduction assembly and the centrifugal brake are integrated into a whole through the flange, centrifugal force is generated through the balancing weight when motor braking fails, and braking is achieved through friction force between the balancing weight and the protective cover.

Description

Technical Field

[0001] The present application relates to the technical field of speed reduction mechanisms, and in particular to a speed reducer, a linear drive device and a lifting device with integrated centrifugal braking function. Background Art

[0002] The core components of the electric cylinder include a reducer, a motor, and a lead screw. Electric cylinders are used in some specific industries that often require higher safety performance, especially lifting equipment with manned functions.

[0003] When the motor in the electric cylinder is powered on and working normally, the electromagnetic brake in the motor is fully opened, and the reducer operates normally, so that the electric cylinder can operate normally. After power failure, the electromagnetic brake in the motor is fully closed, the reducer stops running, and the electric cylinder stops running, but the electromagnetic brake in the motor can be mechanically opened by pulling the external manual release. However, when the electromagnetic brake in the motor fails and cannot provide braking torque, or when the electromagnetic brake in the motor is manually released, the electric cylinder will rotate in the direction of the external torque under the condition of external torque. When the external torque is much greater than the friction torque of the electric cylinder itself, the electric cylinder will stall, causing the lifting platform in the lifting equipment to stall and land, which is prone to dangerous situations. Utility Model Content

[0004] The technical problem to be solved by the utility model is that when the motor brake fails, the electric cylinder stalls, causing the lifting platform in the lifting equipment to stall and fall, which is prone to dangerous situations.

[0005] To this end, the utility model provides a speed reducer, a linear drive device and a lifting device with integrated centrifugal braking function.

[0006] The technical solution adopted by the utility model to solve its technical problems is:

[0007] A speed reducer with integrated centrifugal braking function, comprising: a speed reduction assembly and a centrifugal brake;

[0008] The deceleration assembly includes a rotating shaft and a gear set connected to the rotating shaft;

[0009] The centrifugal brake comprises:

[0010] A protective cover connected to the housing;

[0011] A connecting shaft, the connecting shaft is coaxially connected to the rotating shaft;

[0012] A counterweight block is slidably connected to the connecting shaft along the radial direction of the connecting shaft, the counterweight block is located in the protective cover, a spring is connected to the counterweight block, and the side wall of the counterweight block away from the connecting shaft is adapted to the inner wall of the protective cover.

[0013] By adopting the above technical solution, when the shaft in the deceleration assembly stalls and the shaft speed is too fast, the rotation drives the connecting shaft to rotate at a high speed, so that the counterweight block is thrown out under the action of centrifugal force and rubs against the inner wall of the protective cover, thereby achieving braking of the shaft. The counterweight block, spring, base and connecting shaft are integrated into the protective cover. Such a built-in component means that the user has less workload during installation because there is already a complete set of pre-assembled units, and there is no need to install the electric cylinder and brake separately. In addition, the built-in centrifugal brake can improve the reliability of the system by reducing the connectors and transmission elements in the transmission chain, reducing the possibility of failure.

[0014] Furthermore, a plurality of the counterweight blocks are arranged along the circumference of the connecting shaft, the spring is arranged in a ring shape, the spring is arranged coaxially with the connecting shaft, and the spring connects the plurality of counterweight blocks together.

[0015] Furthermore, the counterweight block is provided with an accommodating cavity for the spring to pass through.

[0016] Furthermore, a plurality of springs are arranged along the axial direction of the connecting shaft.

[0017] By adopting the above technical solution, the spring runs through the counterweight block, so that the spring exerts uniform pulling force on the counterweight block, and the friction force between the counterweight block and the inner wall of the protective cover is uniform at all locations when the counterweight block is centrifugal.

[0018] Furthermore, a friction plate is connected to the side wall of the counterweight block away from the connecting shaft.

[0019] Furthermore, the material of the inner wall of the protective cover is rough hard metal.

[0020] Furthermore, the shell is connected to a base via a reducer flange, and the protective cover is connected to the base.

[0021] A linear drive device, comprising:

[0022] Output mechanism, and

[0023] A motor, wherein the motor is used to drive the output mechanism to operate;

[0024] The above-mentioned reducer with integrated centrifugal braking function is connected between the motor and the output mechanism.

[0025] By adopting the above technical solution, when the electromagnetic brake in the motor fails and cannot provide braking torque, or when the electromagnetic brake in the motor is manually released, the electric cylinder will rotate in the direction of the external torque under the condition of external torque. When the external torque is much larger than the friction torque of the electric cylinder itself, the electric cylinder will stall, which is prone to dangerous situations in some specific application scenarios. However, after adding the centrifugal brake, the higher the stall speed, the greater the centrifugal force generated by the stall. Once the centrifugal force of the stall exceeds the tension of the spring, the counterweight will be thrown out, and the side wall of the counterweight away from the connecting shaft will rub against the inner wall of the protective cover, thereby increasing the friction contact area. At this time, the kinetic energy is converted into internal energy, resulting in a deceleration braking effect.

[0026] Furthermore, the deceleration assembly is connected to the output mechanism, and the centrifugal brake is connected to the motor.

[0027] Furthermore, a detection meter is provided on the motor.

[0028] Furthermore, the detection meter is a current detection meter, and the current detection meter is used to detect the current value of the motor.

[0029] Furthermore, the detection meter is a rotation speed detection meter, and the rotation speed detection meter is used to detect the rotation speed of the motor.

[0030] A lifting device uses the above-mentioned linear drive device as a driving source.

[0031] The beneficial effect of the utility model is that when the electromagnetic brake in the motor fails and cannot provide braking torque, or when the electromagnetic brake in the motor is manually released, the electric cylinder will rotate in the direction of the external torque under the condition of external torque. When the external torque is much larger than the friction torque of the electric cylinder itself, the electric cylinder will stall, which is prone to dangerous situations in some specific application scenarios. However, after adding the centrifugal brake, the higher the stall speed, the greater the centrifugal force generated by the stall. Once the centrifugal force of the stall exceeds the tension of the spring, the tightened counterweight will be thrown out, and the friction plate and the inner wall of the protective cover will rub against each other. At this time, the kinetic energy is converted into internal energy, producing a deceleration braking effect.

[0032] In the present application, the reduction assembly and the centrifugal brake are connected as a whole through flanges. Since the components are manufactured as a whole, the reducer as a whole can be dynamically balanced to better control noise and vibration and improve operating comfort.

[0033] The counterweight, spring, base and connecting shaft are integrated into the protective cover. Such built-in components mean that users have less work to do during installation because they already have a complete set of pre-assembled units and do not need to install the electric cylinder and brake separately. In addition, the built-in centrifugal brake can improve the reliability of the system by reducing the number of connectors and transmission elements in the transmission chain, reducing the possibility of failure. And because of the integration of the system, maintenance points are easier to access, and component replacement and inspection are more convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0035] Figure 1 It is a structural schematic diagram of a speed reducer with integrated centrifugal braking function in the utility model.

[0036] Figure 2 It is a schematic diagram of the positional relationship between the reduction assembly and the connecting shaft in the utility model.

[0037] Figure 3 It is a structural schematic diagram of the centrifugal brake in the utility model.

[0038] Figure 4 It is a schematic diagram of the positional relationship between the counterweight block and the connecting shaft in the utility model.

[0039] Figure 5 It is a structural schematic diagram of a linear drive device in the utility model.

[0040] In the figure: 1. reduction assembly; 11. rotating shaft; 12. housing; 2. centrifugal brake; 20. connecting shaft; 21. base; 22. protective cover; 23. spring; 24. counterweight; 25. friction plate; 26. accommodating chamber; 3. reducer flange; 4. motor; 5. output mechanism. DETAILED DESCRIPTION

[0041] Now the utility model is further described in detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, which only illustrate the basic structure of the utility model in a schematic manner, and therefore only show the components related to the utility model.

[0042] In the description of the present utility model, it is necessary to understand that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, features defined as "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, unless otherwise specified, "multiple" means two or more.

[0043] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0044] Example 1

[0045] A speed reducer with integrated centrifugal braking function comprises a speed reducer assembly 1 and a centrifugal brake 2. The speed reducer assembly 1 and the centrifugal brake 2 are connected via a speed reducer flange 3.

[0046] The reduction assembly 1 includes a gear set, a rotating shaft 11 and a housing 12. The reduction assembly 1 is installed in the housing 12. One end of the rotating shaft 11 passes through the housing 12, and the other end is located in the housing 12 and connected to the gear set. Under the transmission of the gear set, the rotating shaft 11 is driven to rotate with low speed and high torque output. The gear set can be a planetary gear set.

[0047] The centrifugal brake 2 includes a connecting shaft 20 , a spring 23 , a counterweight 24 , a base 21 and a protective cover 22 . The base 21 is connected to the reduction assembly 1 through the reducer flange 3, the protective cover 22 is connected to the base 21, and an installation cavity is formed between the protective cover 22 and the base 21. The counterweight 24 and the spring 23 are located in the installation cavity. The connecting shaft 20 passes through the base 21, the protective cover 22 is coaxially connected to the rotating shaft 11, and multiple counterweights 24 are arranged around the circumference of the connecting shaft 20. The counterweights 24 move radially along the connecting shaft 20. In this embodiment, three counterweights 24 are arranged, and a friction plate 25 is connected to the side wall of the counterweight 24 away from the connecting shaft 20. The spring 23 is arranged in an annular shape, and the spring 23 is coaxially arranged with the connecting shaft 20. The spring 23 connects multiple counterweights 24 together, and an accommodating cavity 26 for the spring 23 to pass through is arranged in the counterweight 24. Multiple springs 23 can be arranged along the axial direction of the connecting shaft 20. In this embodiment, two springs 23 are arranged.

[0048] When the reducer with integrated centrifugal brake function is used, the reducer with integrated centrifugal brake function is rigidly connected to the motor 4 as a whole. When the motor 4 is powered on and working normally, the electromagnetic brake in the motor 4 is fully opened, the reducer operates normally, and the electric cylinder operates normally. After power failure, the electromagnetic brake in the motor 4 is fully closed, the reducer stops running, and the electric cylinder stops running. However, the electromagnetic brake in the motor 4 can be mechanically opened by pulling the external manual release.

[0049] When the electromagnetic brake in the motor 4 fails and cannot provide braking torque, or when the electromagnetic brake in the motor 4 is manually released, the electric cylinder will rotate in the direction of the external torque under the condition of external torque. When the external torque is much larger than the friction torque of the electric cylinder itself, the electric cylinder will stall, which may lead to dangerous situations in some specific application scenarios. However, after adding the centrifugal brake 2, the higher the stall speed, the greater the centrifugal force generated by the stall. Once the centrifugal force of the stall exceeds the tension of the spring 23, the originally tightened counterweight 24 will be thrown out radially, and the friction plate 25 on the counterweight 24 will rub against the inner wall of the protective cover 22. At this time, the kinetic energy is converted into internal energy, resulting in a deceleration braking effect.

[0050] Since the centrifugal brake 2 is braked by friction deceleration, the material of the inner wall of the protective cover 22 is a hard metal with a certain degree of roughness and friction, thereby improving the effect of friction braking.

[0051] A linear drive device includes a motor 4, an output mechanism 5, and a reducer with integrated centrifugal braking function as described above, wherein the reducer with integrated centrifugal braking function is connected between the output mechanism 5 and the motor 4, the reducer with integrated centrifugal braking function is rigidly connected to the motor 4, the centrifugal brake 2 is arranged close to the motor 4, the reduction assembly 1 is arranged close to the output mechanism 5, and the output mechanism 5 can be an electric cylinder.

[0052] A lifting device uses the above-mentioned linear drive device as a driving source.

[0053] Lifting equipment includes but is not limited to mast-type aerial work platforms, cranes, etc. Lifting equipment usually uses a linear drive device to drive the corresponding load-bearing platform, and an electric cylinder is a type of linear drive device. When the lifting equipment encounters an emergency (such as a sudden power outage) and needs to be lowered, it needs to be decelerated and fall back for protection. At this time, the electric cylinder equipped with a reducer with a centrifugal brake 2 and an integrated centrifugal brake function can play a good protective role. Specific implementation method: After an emergency occurs (such as a sudden power outage), the electromagnetic brake in the motor 4 closes and locks the rotating shaft 11. At this time, the lifting platform is at a certain height position, which is dangerous and needs to be lowered back to the platform as soon as possible. At this time, the manual release on the electric cylinder equipped with a reducer with integrated centrifugal braking function with a centrifugal brake 2 can be pulled, and the electromagnetic brake in the motor 4 is opened accordingly. Under the action of gravity acceleration, the electric cylinder begins to accelerate and retract, and the rotating shaft 11 and the connecting shaft 20 in the reducer with integrated centrifugal braking function will rotate at a faster speed. When the centrifugal force brought by the speed exceeds the tension of the spring 23 in the centrifugal brake 2, the counterweight 24 is thrown out, and the friction plate 25 and the inner wall of the protective cover 22 are decelerated by friction, and the kinetic energy loss is heat energy, which decelerates and falls back.

[0054] In addition, because the centrifugal brake 2 brakes by friction deceleration, it will definitely wear out and need to be replaced from time to time. After the reducer with integrated centrifugal braking function is installed on the electric cylinder, the rated load is applied for emergency fallback and the fallback speed is tested. After a period of use, the rated load is applied for emergency fallback again, the speed is compared, and the new centrifugal brake 2 is replaced in time.

[0055] Example 2

[0056] The difference from Example 1 is that a detection meter is provided on the motor 4, and the detection meter can be a current detection meter or a speed detection meter. Because the centrifugal brake 2 is braked by friction deceleration, there will be some loss and it needs to be replaced from time to time. This loss can be monitored by the current value or speed value of the motor 4. The motor 4 is energized at no load and moves at a certain high speed. This speed can make the centrifugal brake 2 fully open to generate friction. At this time, the current value of the motor 4 can be read and recorded. After a period of use, the motor 4 is operated at no load at this speed. When the current value difference is large, it is necessary to replace the new centrifugal brake 2 in time.

[0057] To sum up, when the electromagnetic brake in the motor 4 fails and cannot provide braking torque, or when the electromagnetic brake in the motor 4 is manually released, the electric cylinder will rotate in the direction of the external torque under the condition of external torque. When the external torque is much larger than the friction torque of the electric cylinder itself, the electric cylinder will stall, which is prone to dangerous situations in some specific application scenarios. However, after adding the centrifugal brake 2, the higher the stall speed, the greater the centrifugal force generated by the stall. Once the centrifugal force of the stall exceeds the tension of the spring 23, the tightened counterweight 24 is thrown out, and the friction plate 25 on the counterweight 24 rubs against the inner wall of the protective cover 22. At this time, the kinetic energy is converted into internal energy, resulting in a deceleration braking effect.

[0058] In the present application, the reduction assembly 1 and the centrifugal brake 2 are connected as a whole through flanges. Since the components are manufactured as a whole, the reducer as a whole can be dynamically balanced to better control noise and vibration and improve operating comfort.

[0059] The counterweight 24, spring 23, base 21 and connecting shaft 20 are integrated into a protective cover 22. Such built-in components mean that the user has less work to do during installation because there is already a complete set of pre-assembled units, and there is no need to install the electric cylinder and brake separately. In addition, the built-in centrifugal brake can improve the reliability of the system by reducing the number of connectors and transmission elements in the transmission chain, reducing the possibility of failure.

[0060] In addition, due to the integration of the system, maintenance points are easier to access, and component replacement and inspection are more convenient. Additional parts and fasteners are reduced, reducing overall assembly costs, saving material costs and labor costs.

[0061] Based on the above ideal embodiments of the utility model, the relevant staff can make various changes and modifications without departing from the technical concept of the utility model through the above description. The technical scope of the utility model is not limited to the content of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A reducer with integrated centrifugal braking function, characterized in that: include: A deceleration assembly (1) and a centrifugal brake (2) connected to the deceleration assembly (1); The speed reduction assembly (1) comprises a rotating shaft (11) and a gear set connected to the rotating shaft (11); The centrifugal brake (2) comprises: A protective cover (22), wherein the protective cover (22) is connected to the deceleration assembly (1); A connecting shaft (20), wherein the connecting shaft (20) is coaxially connected to the rotating shaft (11); A counterweight (24), wherein the counterweight (24) is slidably connected to the connecting shaft (20) along the radial direction of the connecting shaft (20), the counterweight (24) is located in the protective cover (22), a spring (23) is connected to the counterweight (24), and the side wall of the counterweight (24) away from the connecting shaft (20) is adapted to the inner wall of the protective cover (22).

2. The reducer with integrated centrifugal braking function according to claim 1, characterized in that: A plurality of the counterweight blocks (24) are arranged along the circumference of the connecting shaft (20); the spring (23) is arranged in an annular shape; the spring (23) is arranged coaxially with the connecting shaft (20); and the spring (23) connects the plurality of counterweight blocks (24) together.

3. The reducer with integrated centrifugal braking function according to claim 2, characterized in that: The counterweight block (24) is provided with a receiving cavity (26) for the spring (23) to pass through.

4. The reducer with integrated centrifugal braking function according to claim 1, characterized in that: A plurality of springs (23) are arranged along the axial direction of the connecting shaft (20).

5. The reducer with integrated centrifugal braking function according to claim 1, characterized in that: A friction plate (25) is connected to the side wall of the counterweight block (24) away from the connecting shaft (20).

6. The reducer with integrated centrifugal braking function according to claim 5, characterized in that: Therefore, the material of the inner side wall of the protective cover (22) is rough hard metal.

7. The reducer with integrated centrifugal braking function according to claim 1, characterized in that: The speed reduction assembly (1) is connected to a base (21) via a speed reducer flange (3), and the protective cover (22) is connected to the base (21).

8. A linear drive device, characterized in that: include: an output mechanism (5), and A motor (4), wherein the motor (4) is used to drive the output mechanism (5) to operate; The reducer with integrated centrifugal braking function according to any one of claims 1 to 7, wherein the reducer with integrated centrifugal braking function is connected between the motor (4) and the output mechanism (5).

9. The linear drive device according to claim 8, characterized in that: The deceleration assembly (1) is connected to an output mechanism (5), and the centrifugal brake (2) is connected to a motor (4).

10. The linear drive device according to claim 8, characterized in that: The motor (4) is provided with a detection meter.

11. The linear drive device according to claim 10, characterized in that: The detection meter is a current detection meter, and the current detection meter is used to detect the current value of the motor (4).

12. The linear drive device according to claim 10, characterized in that: The detection meter is a rotation speed detection meter, and the rotation speed detection meter is used to detect the rotation speed of the motor (4).

13. A lifting device, characterized in that: The lifting device uses the linear drive device described in any one of claims 8 to 12 as a driving source.

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