Winding speed reducer with dry type electromagnetic braking function and engineering machinery

Abstract

The invention relates to a winch speed reducer with a dry type electromagnetic braking function and engineering machinery. The device comprises a winding drum which is rotatably mounted on a rack through a supporting device; the planetary gear transmission device comprises a gear ring fixedly connected with the rack, an input-stage sun gear and an output-stage planet carrier, the input-stage sun gear and the output-stage planet carrier can rotate relative to the gear ring, and the output-stage planet carrier is in transmission connection with the winding drum; the electromagnetic braking device is installed on the planetary gear transmission device, the electromagnetic braking device comprises a conductive coil, a connecting shaft and a friction plate set connected with the connecting shaft, and the connecting shaft is used for transmitting power of an external driving mechanism to an input-stage sun gear; the internal structure of the speed reducer is correspondingly arranged through the dry type electromagnetic braking technology, the reliability is high, the braking friction coefficient is higher, maintenance is convenient, and the response speed is high.

Description

TECHNICAL FIELD

[0001] The application relates to a winch speed reducer with a dry electromagnetic braking function and engineering machinery. BACKGROUND

[0002] A conventional winch speed reducer mainly controls power transmission through a hydraulic braking mode, which is low in safety and reliability, inconvenient to maintain, high in risk of oil leakage and easy to pollute the environment; in addition, the hydraulic braking mode has inherent defects of energy loss and delayed transmission, which affects the control performance of the winch mechanism.

[0003] The hydraulic braking device needs a sealing member to form a sealing cavity to store or release high-pressure oil, so as to realize control of power transmission; in the repeated braking process of the speed reducer, the sealing member is easily damaged, oil leakage failure occurs, the reliability is low, and the environment is easily polluted. The conventional winch speed reducer has gear lubricating oil participating in work, which affects the braking friction coefficient, reduces the braking capacity, has a risk of hook slipping and is low in safety performance; in addition, when the sealing member and the friction plate of the braking device and other vulnerable parts are maintained and replaced, the lubricating oil of the speed reducer needs to be completely discharged, the maintenance performance is poor, the working efficiency is low, and the lubricating oil is easy to splash and pollute the environment. Since the braking high-pressure oil has hysteresis in transmission in the system and has energy loss, the speed reducer braking device cannot be timely opened or closed, and even cannot be opened or closed, which causes the winch speed reducer to be delayed, stuck, dithered, abnormal and the like, and affects the control performance of the winch speed reducer. SUMMARY

[0004] The application aims to provide a winch speed reducer with a dry electromagnetic braking function and engineering machinery, which adopts a dry electromagnetic braking technology and correspondingly arranges the internal structure of the speed reducer, is high in reliability, has a higher braking friction coefficient, is convenient to maintain and fast in response speed.

[0005] In a first aspect, the application provides a winch speed reducer with a dry electromagnetic braking function, which comprises: A winding drum is rotatably installed on a rack through a supporting device; A planetary gear transmission device comprises a gear ring fixedly connected with the rack and an input stage sun gear and an output stage planet carrier rotatable relative to the gear ring, and the output stage planet carrier is in transmission connection with the winding drum; An electromagnetic braking device is installed on the planetary gear transmission device, and the electromagnetic braking device comprises an armature, a conductive coil, a spring, a connecting shaft and a friction plate set connected with the connecting shaft, and the connecting shaft is used for transmitting power of an external driving mechanism to the input stage sun gear; When the conductive coil is not powered, the armature is pressed against the friction plate set under the action of the spring, the friction plate set applies a braking torque to the connecting shaft to brake the winding drum; When the electrically conductive coil is energized, the armature overcomes the spring action and separates from the friction plate set under the magnetic force of the coil seat to release the drum from braking.

[0006] Optionally, the support device comprises: a support seat fixedly installed on the frame; a support shaft rotatably installed on the support seat, and the second web of the drum is fastened to the support shaft.

[0007] Optionally, the driving mechanism comprises an electric motor or a hydraulic motor.

[0008] Optionally, a planetary carrier key tooth is arranged on the outer periphery of the output stage planetary carrier, and the planetary carrier key tooth is connected with the inner circular hole key tooth of the first web of the drum to enable the output stage planetary carrier to drive the drum to rotate.

[0009] Optionally, the support device further comprises: a locking nut for axially pressing the output stage planetary carrier against the first web of the drum to axially fix the output stage planetary carrier and the first web.

[0010] Optionally, the electromagnetic brake device further comprises: a coil seat fixedly connected with the ring gear, an annular groove and a counterbore are arranged on the coil seat, the electrically conductive coil is arranged in the annular groove, the spring is arranged in the counterbore, and the armature is arranged between the coil seat and the friction plate set; a brake housing fixedly connected with the ring gear, and the brake housing and the connecting shaft are connected through a first bearing.

[0011] Optionally, a coil seat through hole is arranged on the coil seat, a ring gear through hole is arranged on the ring gear, and the interface end of the electrically conductive coil passes through the coil seat through hole and the ring gear through hole to be connected with the power supply.

[0012] Optionally, the friction plate set comprises: a static friction plate, a static friction plate key tooth is arranged on the outer periphery of the static friction plate, and the static friction plate key tooth is connected with a brake housing key tooth on the inner side of the brake housing; a dynamic friction plate, the inner periphery of the dynamic friction plate is in surface contact with the static friction plate, a dynamic friction plate key tooth is arranged on the inner periphery of the dynamic friction plate, and the dynamic friction plate key tooth is connected with a third key tooth on the outer periphery of the transmission shaft.

[0013] Optionally, the support device further comprises: a rotary seal arranged between the connecting shaft and the inner wall of the brake housing; a second bearing arranged between the outer periphery of the ring gear and the inner wall of the drum a static seal arranged between the brake housing and the ring gear.

[0014] In a second aspect, the present application provides a construction machine comprising the winch speed reducer with dry electromagnetic braking function.

[0015] Compared with the prior art, the present application has the following beneficial effects: 1. The present application can transmit power from the external driving mechanism to the winding drum through the planetary gear transmission device to drive the winding drum to rotate. The electromagnetic brake device is further installed on the planetary gear transmission device. By controlling the energization state of the conductive coil of the electromagnetic brake device, the brake torque can be applied to the connecting shaft of the planetary gear transmission device through the friction plate set of the electromagnetic brake device to control the braking state of the winding drum, which is reliable and fast in response.

[0016] 2. The present application adopts electromagnetic braking technology, which has no risk of oil leakage compared with hydraulic braking, high reliability, higher braking friction coefficient, higher safety performance, convenient maintenance and replacement, no need to discharge the lubricating oil in the speed reducer, fast response, less energy loss and other advantages, solves the problem of action delay of traditional hydraulic braking device, and besides, the electromagnetic braking technology can realize pure electric driving operation to meet the needs of electrification and intelligentization. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 Figure 1 is a structural schematic diagram of the winch speed reducer in the embodiment of the present application; Figure 2 Figure 2 is a structural schematic diagram of the planetary gear transmission device in the embodiment of the present application; Figure 3 Figure 3 is a structural schematic diagram of the electromagnetic brake device in the embodiment of the present application; Figure 4 Figure 4 is a sectional structural schematic diagram of the coil seat of the electromagnetic brake device in the embodiment of the present application; Figure 5 Figure 5 is a sectional structural schematic diagram of the connecting shaft of the electromagnetic brake device in the embodiment of the present application; Figure 6 Figure 6 is a sectional structural schematic diagram of the brake housing of the electromagnetic brake device in the embodiment of the present application.

[0018] The figure label: 1, planetary gear transmission; 101, gear ring; 1011, gear ring mounting hole; 1012, gear ring through hole; 102, input stage sun gear; 1021, input stage sun gear key tooth; 103, output stage carrier; 1031, carrier key tooth; 2, electromagnetic brake device; 201, coil seat; 2011, coil seat mounting hole; 2012, counterbore; 2013, annular groove; 2014, coil seat through hole; 202, connecting shaft; 2021, first key tooth; 2022, second key tooth; 2023, third key tooth; 203, armature; 204, conductive coil; 2041, coil lead interface; 205, spring; 206, brake housing; 2061, brake housing mounting hole; 2062, brake housing key tooth; 207, friction plate set; 2071, static friction plate; 2072, dynamic friction plate; 208, first bearing; 209, rotary seal; 210, static seal; 3, winding drum; 31, first web; 32, second web; 4, connecting disc; 41, connecting disc mounting hole; 5, first bolt set; 6, second bolt set; 7, third bolt set; 8, second bearing; 9, lock nut; 10, fourth bolt set; 11, support device; 1101, support seat; 1102, support shaft; 12, fifth bolt set; 13, rack. DETAILED DESCRIPTION

[0019] In the description of the present application, it needs to be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second" and the like are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" and the like can explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise specified and limited, the terms "mounting", "connecting", "connecting" should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be connected inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0020] The present invention will be further described below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and should not be used to limit the scope of protection of the present invention.

[0021] To make the purpose, technical solution, and advantages of this invention patent clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0022] This embodiment provides a winch reducer structure with dry electromagnetic braking function, where the transmission power is output from the planetary carrier after being reduced in speed and increased in torque. This ultimately achieves the purpose of lifting or lowering heavy objects; it has broad application prospects in engineering machinery fields such as construction, mining, and ports, for example, in the winch mechanisms of cranes, rotary drilling rigs, and overhead cranes.

[0023] like Figure 1 As shown, the winch reducer in this embodiment includes a planetary gear transmission device 1, an electromagnetic braking device 2, a drum 3, a connecting disc 4, a support device 11, and several fasteners for assembly. The winch reducer is mounted and fixed on the external frame 13 by the third bolt group 7 and the fifth bolt group 12.

[0024] The planetary gear transmission device 1 can be a single-stage planetary gear transmission structure or a multi-stage planetary gear transmission structure, which has the function of speed reduction and torque increase, and the transmission power is output from the planet carrier. Figure 2 As shown, the planetary gear transmission device 1 includes a gear ring 101, an input stage sun gear 102, and an output stage planet carrier 103; the input stage sun gear 102 and the output stage planet carrier 103 are rotatable relative to the gear ring 101; the output stage planet carrier 103 is provided with planet carrier key teeth 1031, which are connected to the key teeth in the inner circular hole of the first web plate 31 of the drum so that the output stage planet carrier 103 can drive the drum to rotate; the output stage planet carrier 103 and the drum 3 are axially fixed together by a locking nut 9, which presses the output stage planet carrier 103 against the first web plate 31 of the drum 3 along the axial direction; the inner and outer rings of the second bearing 8 are respectively in contact with the outer circle of the planetary gear transmission device 1 (outer circumference of the gear ring 101) and the inner hole of the drum 3 to radially fix the planetary gear transmission device 1 and the drum 3.

[0025] The electromagnetic brake device 2 has a power-off braking function, is arranged in the planetary gear transmission device 1, and is provided with an isolation seal between the electromagnetic brake device 2 and the planetary gear transmission device 1, so that the lubricating and cooling medium such as gear oil cannot enter the electromagnetic brake device 2, and the braking capacity is improved. The electromagnetic brake device 2 comprises a coil seat 201, a conductive coil 204, a brake shell 206, an armature 203, a connecting shaft 202, a spring 205, and a friction plate group 207. The coil seat 201 generates magnetism when the conductive coil 204 is electrified, and the magnetism disappears when the power is lost. The spring 205 can be a spiral spring or a butterfly spring. The friction plate group 207 can be composed of a single set of static friction plate 2071 and dynamic friction plate 2072, or a plurality of sets of static friction plate 2071 and dynamic friction plate 2072. The case adopts a spiral spring and a plurality of friction plate structure, as shown in Figure 3 、 Figure 4 The coil seat 201 is provided with an annular groove 2013 and a plurality of counterbores 2012. The conductive coil 204 is arranged in the annular groove 2013. The coil lead interfaces 2041 of the conductive coil 204 pass through the coil seat through hole 2014 and the ring gear through hole 1012 to be connected with the external power source. The spring 205 is arranged in the counterbores 2012 of the coil seat 201 and is in a compressed state. The armature 203 is arranged between the coil seat 201 and the friction plate group 207 and is provided with an axial gap for movement. The outer circular surface of the static friction plate 2071 is provided with static friction plate key teeth, which are connected with the brake shell key teeth 2062 to be fixed. The inner circular surface of the dynamic friction plate 2072 is provided with dynamic friction plate key teeth, which are connected with the third key teeth 2023 of the connecting shaft 202 to apply the friction torque generated by the friction plate group 207 to the connecting shaft 202 for braking.

[0026] In combination with Figures 4-6 , the connecting shaft is further provided with a first key tooth 2021 and a second key tooth 2022. The first key tooth 2021 is connected with the external power source, and the second key tooth 2022 is connected with the input stage sun gear key tooth 1021 to transmit power. The inner and outer circular surfaces of the first bearing 208 and the rotary seal 209 are in contact with the brake shell 206 and the connecting shaft 202, respectively. The first bolt group 5 passes through the coil seat mounting hole 2011, the brake shell mounting hole 2061, and the ring gear mounting hole 1011 in sequence to fix the electromagnetic brake device 2 on the planetary gear transmission device 1. The static seal 210 is arranged between the contact surface of the electromagnetic brake device 2 and the planetary gear transmission device 1, that is, between the brake shell 206 and the ring gear 101. The static seal 210 and the rotary seal 209 can effectively prevent the lubricating and cooling medium such as gear oil from entering the electromagnetic brake device 2 to improve the braking capacity.

[0027] The connecting plate 4 mainly plays a role of fixing an external power source; the external power source can be a motor or a hydraulic motor, etc. Figure 1 As shown in the figure, the second bolt group 6 fixes and connects the connecting plate 4 on the end surface of the planetary gear transmission device 1; the end surface of the connecting plate 4 is provided with a plurality of connecting plate mounting holes 41, through which the external power source is mounted and fixed on the connecting plate 4.

[0028] The support device 11 mainly plays a role of supporting the winding drum 3. As shown in the figure, Figure 1 The support device 11 is mainly composed of a support seat 1101, a support shaft 1102 and other components; the support shaft 1102 is mounted and fixed on the second web plate 32 of the winding drum through the fourth bolt group 10, and can rotate relative to the support seat 1101.

[0029] In combination with the working principle, when the winding reduction gear works, the electric coil 204 is electrified, so that the coil seat 201 generates a magnetic field, which overcomes the spring 205 elastic force and adsorbs the armature 203 to move away from the friction plate group 207, until the spring elastic force of the friction plate group 207 is zero, at this time the friction torque is close to zero, the electromagnetic brake 2 is released, the power source transmits power to the planetary gear transmission device 1 through the connecting shaft 202, and then drives the winding drum 3 to rotate after the reduction and torque increase, and realizes the lifting and lowering of the heavy object with the aid of the rope and other media; when stopping working, the electric coil 204 loses electricity, the coil seat 201 magnetic field disappears, the armature 203 moves to the friction plate group 207 under the action of the spring 205 elastic force, and the friction plate group 207 is pressed tightly, at this time the friction plate group 207 generates a friction torque, which can prevent the connecting shaft 202 from rotating, cut off the power transmission of the power source, and stop the winding reduction gear from working.

[0030] The above-mentioned is only the preferred embodiment of the present application, it should be pointed out that, for the ordinary skilled in the art, without departing from the technical principles of the present application, can make a number of improvements and modifications, these improvements and modifications should also be regarded as the protection scope of the present application.

Claims

1. A winch reducer with dry electromagnetic braking function, characterized in that, include: The drum (3) is rotatably mounted on the frame (13) via a support device (11); The planetary gear transmission device (1) includes a gear ring (101) fixedly connected to the frame (13), an input stage sun gear (102) and an output stage planet carrier (103) rotatable relative to the gear ring (101), the output stage planet carrier (103) being drivenly connected to the drum (3); An electromagnetic braking device (2) is installed on the planetary gear transmission device (1). The electromagnetic braking device (2) includes an armature (203), a conductive coil (204), a spring (205), a connecting shaft (202) that is connected to the input stage sun gear (102), and a friction plate assembly (207) connected to the connecting shaft (202). The connecting shaft (202) is used to transmit the power of the external drive mechanism to the input stage sun gear (102). When the conductive coil (204) is not energized, the armature (203) presses the friction plate group (207) under the action of the spring (205), and the friction plate group (207) applies a braking torque to the connecting shaft (202) to brake the drum (3); When the conductive coil (204) is energized, the armature (203) overcomes the action of the spring (205) and disengages from the friction plate group (207) under the magnetic force of the coil seat (201), so that the drum (3) is released from braking.

2. The winch reducer with dry electromagnetic braking function according to claim 1, characterized in that, The support device (11) includes: The support base (1101) is fixedly installed on the frame (13); The support shaft (1102) is rotatably mounted on the support base (1101), and the second web plate (32) of the drum (3) is fastened to the support shaft (1102).

3. The winch reducer with dry electromagnetic braking function according to claim 1, characterized in that, The drive mechanism includes an electric motor or a hydraulic motor.

4. The winch reducer with dry electromagnetic braking function according to claim 1, characterized in that, The outer circumferential surface of the output stage planetary carrier (103) is provided with planetary carrier key teeth (1031), and the planetary carrier key teeth (1031) are connected to the inner circular hole key teeth of the first web plate (31) of the drum (3) so that the output stage planetary carrier (103) can drive the drum (3) to rotate.

5. The winch reducer with dry electromagnetic braking function according to claim 4, characterized in that, Also includes: Locking nut (9) is used to press the output stage planetary carrier (103) against the first web plate (31) of the drum (3) in the axial direction to fix the output stage planetary carrier (103) and the first web plate (31) in the axial direction.

6. The winch reducer with dry electromagnetic braking function according to claim 1, characterized in that, The electromagnetic braking device (2) further includes: A coil holder (201) is fixedly connected to a gear ring (101); an annular groove (2013) and a countersunk hole (2012) are provided on the coil holder (201), and the conductive coil (204) is disposed in the annular groove (2013); the spring (205) is disposed in the countersunk hole (2012), and the armature (203) is disposed between the coil holder (201) and the friction plate assembly (207); The brake housing (206) is fixedly connected to the gear ring (101); the brake housing (206) and the connecting shaft (202) are connected by a first bearing (208).

7. The winch reducer with dry electromagnetic braking function according to claim 6, characterized in that, The coil holder (201) has a coil holder through hole (2014), and the toothed ring (101) has a toothed ring through hole (1012). The interface end of the conductive coil (204) passes through the coil holder through hole (2014) and the toothed ring through hole (1012) to connect to the power supply.

8. The winch reducer with dry electromagnetic braking function according to claim 6, characterized in that, The friction pad assembly (207) includes: The static friction plate (2071) has static friction plate key teeth on its outer peripheral surface, and the static friction plate key teeth are connected to the brake housing key teeth (2062) on the inner side of the brake housing (206). The moving friction plate (2072) is in surface contact with the static friction plate (2071). The inner circumferential surface of the moving friction plate (2072) is provided with moving friction plate key teeth, and the moving friction plate key teeth are connected to the third key teeth (2023) on the outer circumferential surface of the transmission shaft.

9. The winch reducer with dry electromagnetic braking function according to claim 6, characterized in that, Also includes: A rotary seal (209) is disposed between the connecting shaft (202) and the inner wall of the brake housing (206); The second bearing (8) is located between the outer periphery of the gear ring (101) and the inner wall of the drum (3). A static seal (210) is provided between the brake housing (206) and the gear ring (101).

10. An engineering machinery, characterized in that, The winch reducer with dry electromagnetic braking function as described in any one of claims 1-9.

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