A wet parking brake device with a rotary structure for a mine shovel

Abstract

The application discloses a rotary structure wet parking brake device for a mine shovel, belongs to the technical field of a multi-plate type hydraulic clutch brake, and solves the problems of the original dry brake being easily affected by external environment, short replacement parts cycle, and long downtime for maintenance, and the technical points are as follows: the device comprises a back plate, a gear ring, a piston, a cylinder body, a friction disc, an intermediate tooth disc, a tooth hub, a spring disc, a polytetrafluoroethylene sealing element and a contact limiting switch, the tooth hub comprises an inner tooth hub and an outer tooth hub, a supporting ring and the inner tooth hub are designed into a non-contact labyrinth seal, a mechanical contact type limiting switch is additionally arranged on the spring disc vertically, an alarm is given to remind replacement when the friction disc is worn to a position, a position sensor is additionally arranged on the spring disc, and an alarm is given to prompt that the brake has been completely opened and the next action can be continued when the piston stroke reaches a position, and the device has the advantages of being easy to disassemble, replace and maintain, not needing to change the clutch brake, being safe and reliable, and being pollution-free.

Description

Technical Field

[0001] This invention relates to the field of multi-plate hydraulic clutch brake applications, specifically to a rotary structure wet parking brake device for mining electric shovels. Background Technology

[0002] In mining electric shovels, clutches and brakes are widely used to realize various functions of the bucket, such as rotation, lifting, pushing and walking. The maximum bucket capacity is 75 cubic meters. It can be operated outdoors for a long time, with high productivity and low operating costs, and its production capacity is very substantial.

[0003] However, the clutches and brakes used to achieve various functions are typically friction-type structures, dry and exposed, with grooves and ventilation holes. But in long-term working environments (dusty, with heat radiation), harsh environmental factors such as dust, rain, snow, and sandstorms can accelerate the wear of the friction discs, leading to a replacement cycle of as little as 5-6 months. This significantly impacts production capacity and increases service costs due to long-term replacements, making it unsuitable for actual use.

[0004] Therefore, there is a need to provide a rotary wet parking brake device for electric mining shovels, which aims to solve the above problems. Summary of the Invention

[0005] To address the shortcomings of existing technologies, the present invention aims to provide a rotary structure wet parking brake device for mining electric shovels. This device addresses the drawbacks of the original dry brake, which is susceptible to external environmental influences, requires frequent parts replacement, and involves long downtime for maintenance. The wet structure significantly increases service life and avoids secondary damage caused by maintenance. From an economic perspective, it effectively improves efficiency, increases actual economic benefits, and reduces maintenance and repair costs.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A rotary wet parking brake device for a mining electric shovel includes a back plate, an active gear ring, and an inner gear hub. The lower outer end of the inner gear hub is fixedly connected to an outer gear hub by bolts, and the outer gear hub and the inner gear hub are sealed by a rotating lip seal ring through a hole. A support plate is provided at the installation connection between the outer gear hub and the inner gear hub. A labyrinth seal is used between the outer gear hub and the support plate to form a U-shaped gear ring and an inverted U-shaped gear hub inner and outer cavity seal. A spring disc is installed above the active gear ring, and a piston is installed below the spring disc. Several friction discs and an intermediate gear disc are provided between the piston and the back plate. The gear hub is divided into an inner gear hub and an outer gear hub. The split design is simple to process. The labyrinth seal and the rotating lip seal ring through the hole between the back plate and the support ring prevent oil from splashing onto other parts.

[0008] As a further aspect of the present invention, the external gear hub is provided with multiple rows of evenly distributed small holes, so that the lubricating oil in the cavity will not cause a pressure difference between the inside and outside.

[0009] As a further embodiment of the present invention, the external gear hub and the support plate are sealed by a number of guide rings.

[0010] As a further aspect of the present invention, an outer disc spring and an inner disc spring for assisting separation are installed between the friction disc and the intermediate toothed disc. When applied vertically, the auxiliary friction disc and the intermediate toothed disc should separate due to gravity.

[0011] As a further aspect of the present invention, a polytetrafluoroethylene (PTFE) step seal is provided between the piston and the cylinder for reciprocating motion sealing.

[0012] As a further aspect of the present invention, a cylindrical compression spring for providing positive pressure for the friction pair is installed between the spring disc and the piston.

[0013] As a further embodiment of the present invention, a contact-type limit switch and a proximity sensor are installed on the spring disc. The contact-type limit switch can remind the friction disc to wear to the required level. When the piston stroke is fully completed, it can provide a signal feedback that the brake is fully open, so that the friction pair can separate with sufficient clearance.

[0014] In summary, the embodiments of the present invention have the following beneficial effects compared with the prior art:

[0015] In this invention, the gear hub includes an inner gear hub and an outer gear hub, forming a U-shaped gear ring and an inverted U-shaped gear hub. There is a support ring welded to the back plate and the inner gear hub, and the back plate and the inner gear hub are designed to form a non-contact labyrinth seal.

[0016] When the brake is installed vertically, the oil level is submerged above the friction disc but not above the labyrinth seal's level line. Due to the relatively high-speed splashing of the friction amplitude, brake oil that may escape from the U-shaped outer cavity is sealed by the upper small-diameter rotating oil seal and flows back into the brake. The oil level in the U-shaped inner cavity is kept below the labyrinth seal at the top of the inverted U-shaped toothed hub due to the low linear velocity and low friction. This avoids the drawbacks of high linear velocity heat and wear associated with using contact-type large-diameter oil seals.

[0017] The device is also equipped with a mechanical contact limit switch that is vertically mounted on the spring disc. When the friction disc wears to the limit, an alarm will sound to remind the user to replace it. A position sensor is also installed on the spring disc. When the piston stroke reaches the limit, an alarm will sound to indicate that the brake has been fully opened and the next action can be continued.

[0018] The sealed wet space allows the friction pair to be immersed in oil, which improves the thermal load capacity of the clutch more efficiently and reduces the wear of the friction material caused by friction. The small holes evenly distributed on the outer gear hub prevent pressure difference between the inner and outer gear hubs.

[0019] The vertical installation feature and labyrinth seal prevent oil from splashing into other equipment. The contact-type limit switch installed on the upper cylinder can effectively remind the user when to replace the friction pair, increasing its service life. The position sensor installed on the cylinder will start the motor only after receiving a signal that the brake is fully open, thus protecting the brake.

[0020] This invention addresses the current situation of dry brakes used in the rotary structure of electric shovels in mines, which suffer from wear and tear on the dry friction disc, short replacement cycles, and poor efficiency. It also saves time on downtime and replacement of parts due to accidents. Furthermore, it solves the problem of wear and failure caused by high temperatures generated during high-frequency operation of the original dry brake.

[0021] This invention has a simple structure, is easy to disassemble, replace and maintain, requires no changes to the clutch or brake, is safe and reliable, and produces no pollution.

[0022] To more clearly illustrate the structural features and effects of the present invention, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of an embodiment of the invention.

[0024] Figure 2 This is a top view of an embodiment of the invention.

[0025] Reference numerals: 1. Back plate; 2. Drive gear ring; 3. Inner gear hub; 4. Outer gear hub; 5. Rotary lip seal for bore; 6. Support plate; 7. Friction disc; 8. Intermediate gear disc; 9. Outer disc spring; 10. Inner disc spring; 11. Piston; 12. PTFE step seal; 13. Cylinder body; 14. Spring disc; 15. Cylindrical compression spring; 16. Contact limit switch; 17. Proximity sensor; 18. Guide ring. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0027] The specific implementation of the present invention will be described in detail below with reference to specific embodiments.

[0028] See Figures 1-2A rotary wet parking brake device for a mining electric shovel includes a back plate 1, an active gear ring 2, and an inner gear hub 3. The lower outer end of the inner gear hub 3 is fixedly connected to an outer gear hub 4 by bolts, and the outer gear hub 4 and the inner gear hub 3 are sealed by a rotating lip seal ring 5 through a hole. A support plate 6 is provided at the connection between the outer gear hub 4 and the inner gear hub 3. The outer gear hub 4 and the support plate 6 form a labyrinth seal to seal the inner and outer cavities of the U-shaped gear ring and the inverted U-shaped gear hub. A spring disc 14 is installed above the active gear ring 2, and a piston 11 is installed below the spring disc 14. Several friction discs 7 and an intermediate gear disc 8 are provided between the piston 11 and the back plate 1.

[0029] Correspondingly, the gear hub is divided into an internal gear hub 3 and an external gear hub 4. The split design is simple to process. A labyrinth seal and a rotating lip seal ring 5 are used between the back plate 1 and the support ring to prevent oil from splashing onto other parts.

[0030] Furthermore, the external gear hub 4 has multiple rows of evenly distributed small holes, so that the lubricating oil in the cavity will not cause a pressure difference between the inside and outside.

[0031] Furthermore, the external gear hub 4 and the support plate 6 are sealed together by a number of guide rings 18.

[0032] Furthermore, an outer disc spring 9 and an inner disc spring 10 for assisting separation are installed between the friction disc 7 and the intermediate toothed disc 8. When used vertically, the auxiliary friction disc 7 and the intermediate toothed disc 8 should separate due to gravity.

[0033] Furthermore, a polytetrafluoroethylene (PTFE) step seal 12 for reciprocating motion sealing is provided between the piston 11 and the cylinder 13.

[0034] Furthermore, a cylindrical compression spring 15 is installed between the spring disc 14 and the piston 11 to provide positive pressure for the friction pair, thereby generating frictional torque.

[0035] Furthermore, a contact-type limit switch 16 and a proximity sensor 17 are installed on the spring disc 14. The brake device is equipped with a contact-type limit switch 16 that can remind the friction disc 7 to wear to the required level, and the signal feedback alarm will replace the friction disc 7. The brake device is also equipped with a proximity sensor 17, which can provide a signal feedback that the brake is fully open when the piston 11 has reached its full stroke, so that there is sufficient clearance for the friction pair to separate.

[0036] Correspondingly, the braking device has a wet structure, which has the characteristics of low friction and wear, virtually no wear, and long service life.

[0037] Preferably, in this embodiment of the invention, the integral brake is vertically installed, forming a sealed wet environment through relatively independent cavities. O-rings are used to seal between the back plate 1 and the active gear ring 2, and between the active gear ring 2 and the cylinder 13. The amount of oil can submerge the uppermost friction plate, which more efficiently improves the thermal load capacity of the clutch and reflects the characteristics of the wet brake: long service life and virtually no wear.

[0038] Preferably, in this embodiment, the originally complex gear hub is divided into an inner gear hub 3 and an outer gear hub 4. The inner gear hub 3 is machined into a spline to connect to the user's motor, and the outer gear hub 4 is machined into an external spline to connect to the intermediate gear disk 8. A rotating lip seal 5 for holes is installed between the gear hub and the support ring of the back plate 1. A labyrinth seal is also designed to prevent the gear hub from throwing oil out of the support ring during rotation and leaving it in the motor. Long-term leakage will damage the motor.

[0039] Preferably, in this embodiment, several rows of small holes are evenly distributed on the outer circle of the outer toothed hub 4, and the small holes correspond to the friction disc 7. When the lubricating oil is full of the liquid level line, it will not cause a pressure difference between the inner cavity and the outer cavity. The internal pressure difference will cause damage to the seal and also cause a certain pressure inside the inner disc spring 10, thereby causing a certain resistance to the rotation of the toothed hub.

[0040] Preferably, in this embodiment, an outer disc spring 9 and an inner disc spring 10 are installed between the friction disc 7 and the intermediate toothed disc 8 to assist the friction pair in separating. Since the user's equipment is used vertically, after the piston 11 is pushed by oil pressure, the friction pair will fall off due to gravity. The disc spring can separate the intermediate toothed disc 8 and the friction disc 7 so that they do not contact each other, thereby allowing the brake to operate normally.

[0041] Preferably, in this embodiment, a contact-type limit switch 16 is installed on the brake spring disc 14. When the friction disc 7 wears, the piston 11 continues to move downward under the influence of the elastic force of the cylindrical compression spring. The piston 11 and the spring disc 14 are fixed by a pin, and the contact-type limit switch 16 is installed on the pin.

[0042] When the friction disc 7 wears to its limit, a signal will be sent to the PLC program in the control room to remind the user to replace the friction disc 7. Similarly, when the brake is opened, the piston 11 is pushed by hydraulic force and contacts the spring disc 14. At this time, the proximity sensor 17 and the piston 11 have a certain distance signal, which will be fed back to ensure that the brake is fully opened.

[0043] It should be noted that the components in this application are all general standard parts or parts known to those skilled in the art, which effectively solves the problems of the original dry brake being susceptible to external environmental influences, requiring frequent replacement of parts, and long downtime for maintenance.

[0044] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A rotary wet parking brake device for a mining electric shovel, characterized in that, The device includes a back plate (1), an active gear ring (2), and an inner gear hub (3). The lower outer end of the inner gear hub (3) is fixedly connected to the outer gear hub (4) by bolts. The outer gear hub (4) and the inner gear hub (3) are sealed by a rotating lip seal ring (5) through a hole. A support plate (6) is provided at the installation connection between the outer gear hub (4) and the inner gear hub (3). The outer gear hub (4) and the support plate (6) are sealed by a labyrinth seal to form a U-shaped gear ring and an inverted U-shaped gear hub inner and outer cavity seal. A spring plate (14) is installed above the active gear ring (2). A piston (11) is installed below the spring plate (14). Several friction plates (7) and an intermediate gear plate (8) are provided between the piston (11) and the back plate (1). The external gear hub (4) has multiple rows of evenly distributed small holes. The external gear hub (4) and the support plate (6) are sealed together by a number of guide rings (18); An outer disc spring (9) and an inner disc spring (10) for assisting separation are installed between the friction disc (7) and the intermediate toothed disc (8); A polytetrafluoroethylene (PTFE) step seal (12) for reciprocating motion sealing is provided between the piston (11) and the cylinder (13); A cylindrical compression spring (15) for providing positive pressure for the friction pair is installed between the spring disc (14) and the piston (11).

2. The rotary structure wet parking brake device for mining electric shovels according to claim 1, characterized in that, The spring plate (14) is equipped with a contact-type limit switch (16) and a proximity sensor (17).

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