Mining car pusher driving device

Abstract

The utility model discloses a driving device of a mining car pusher. The driving device comprises a rack; the main shaft is mounted on the rack through a bearing assembly; the reduction gearbox is connected with the main shaft through a coupler; and the intrinsic safety type variable-frequency and variable-speed motor is connected with the reduction gearbox. The mining car pusher driving device is an alternative scheme of a low-rotating-speed high-torque adjustable-speed motor.

Description

Technical Field

[0001] The utility model relates to a driving device for a mining pusher. Background Art

[0002] Mining carts are a common type of mining equipment. Considering the explosion-proof performance, the driving devices used in mining carts are generally driven by hydraulic components, such as hydraulic motors. However, hydraulic motors need to be adapted to hydraulic stations, control systems, and hydraulic circuits, which are collectively called hydraulic systems. The typical feature of hydraulic systems is high power density, so they are suitable for heavy-duty equipment, and mining carts are just a type of heavy-duty equipment.

[0003] In addition to the inherent defects of the hydraulic system, since the hydraulic system is hydraulically driven, the entire hydraulic system must use hydraulic oil. According to the safety requirements for coal mine use, the hydraulic oil must use flame-retardant (i.e. combustion grade B1, note: grade A is non-flammable, grade B2 is flammable, and grade B3 is flammable) hydraulic oil. However, flame-retardant hydraulic oil is highly corrosive and can cause severe corrosion to the components of the hydraulic system, such as hydraulic motors, hydraulic valves, hydraulic pumps, and hydraulic pipe fittings. This will seriously affect the performance and service life of the equipment, increase production costs, and increase maintenance workload.

[0004] Reference: “Study on Corrosion and Modification of New Ester-type Flame-retardant Hydraulic Oil for Underground Coal Mines”, Coal Mining, Vol. 18, No. 6 (Total No. 115), December 2013, Zhai Jing.

[0005] With the gradual maturity of intrinsically safe motors (full name intrinsically safe motors, which are a type of explosion-proof electrical equipment, and implement the fourth part of GB3836.4-2010 "Explosive Environments" "Equipment protected by intrinsically safe 'i'"), motors can be used in working conditions such as coal mines that have relatively high requirements for explosion-proof environments. Therefore, they are also used in mining carts, but as mentioned above, since mining carts are heavy-duty equipment and have a relatively slow running speed, when selecting intrinsically safe motors, it is necessary to select special low-speed, high-torque adjustable speed motors, but the cost of such motors is generally high. Utility Model Content

[0006] In view of this, the purpose of the utility model is to provide a mining cart driving device that replaces the low-speed high-torque adjustable-speed motor.

[0007] The driving device of a mining cart according to an embodiment of the utility model comprises:

[0008] frame;

[0009] A main shaft, mounted on the frame via a bearing assembly;

[0010] A reduction box connected to the main shaft via a coupling;

[0011] An intrinsically safe variable frequency speed regulating motor is connected to the reduction box.

[0012] Optionally, the reduction box and the main shaft are connected by a star coupling or a plum coupling.

[0013] Optionally, the reduction box is used to be connected to a corresponding coupling and the shaft section exposed from the reduction box is covered by a bell-shaped cover.

[0014] Optionally, the shaft part mounted on the main shaft for outputting power is positioned and locked by a first retaining ring;

[0015] The first retaining ring is a sleeve-shaped structure, and a first set screw hole is opened on the side of the first retaining ring;

[0016] A first set screw is provided accordingly to lock the first retaining ring on the main shaft through the first set screw hole.

[0017] Optionally, each first retaining ring is provided with a pair or two pairs of first fixing screw holes, and the two first fixing screw holes in the group are symmetrical about the axis of the first retaining ring.

[0018] Optionally, the diameter of the shaft section on which the on-shaft part is installed is larger than the diameter of the shaft section on which the first retaining ring is located;

[0019] Correspondingly, the inner hole of the first retaining ring has a chamfer.

[0020] Optionally, the bearing assembly includes a bearing seat fixed on the frame, a bearing installed in a seat hole of the bearing seat, and a bearing cap installed at each end of the seat hole of the bearing seat;

[0021] The bearing caps include bearing caps with holes and bearing caps without holes.

[0022] The bearing cover with a hole is fixed on the bearing seat and is limited by a second retaining ring.

[0023] Optionally, the second retaining ring is a sleeve-shaped structure, and a second set screw hole is correspondingly opened on the side surface of the second retaining ring;

[0024] A second set screw is provided accordingly to lock the second retaining ring on the main shaft through the second set screw hole.

[0025] Optionally, each first retaining ring is provided with a pair or two pairs of first fixing screw holes, and the two first fixing screw holes in the group are symmetrical about the axis of the first retaining ring.

[0026] Optionally, an annular groove is formed on the outer end surface of the bearing cover with a hole, and the axis of the annular groove is colinear with the axis of the bearing cover with a hole;

[0027] The second retaining ring has an annular protrusion inserted into the annular groove.

[0028] The mining cart driving device according to the embodiment of the utility model takes into account the particularity of the technical field and has special requirements for the selection of power components. Although the combination of electric motors and reducers is a common method in the mechanical field, it still lacks specific applications in this field. In other words, under the condition of using intrinsically safe motors with reducers in this special technical field, the technical requirements of low speed and heavy load are met. At the same time, the intrinsically safe variable frequency speed regulating motor can not only adjust the speed, but also adjust its output torque, so that it can replace the traditional low speed and high torque adjustable speed special motor, reducing the overall cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the main cross-section structure of a mining cart device in one embodiment.

[0030] Figure 2 It is a schematic diagram of the top view of the structure of a mining cart device in one embodiment.

[0031] Figure 3 for Figure 1 Enlarged view of part I.

[0032] In the figure: 1. gear, 2. A-type flat key, 3. bearing seat, 4. felt ring oil seal, 5. spherical roller bearing, 6. left end cover, 7. joint type pressure injection oil cup, 8. right end cover, 9. small retaining ring, 10. slotted cone end set screw, 11. short retaining ring, 12. long retaining ring, 13. main shaft, 14. star coupling, 15. flat key, 16. bell cover, 17. gear reduction device, 18. frame, 19. hexagonal head bolt, 2 0. Spring washer, 21. Hexagon head bolt, 22. Hexagon nut, 23. Flat washer, 24. Elastic washer, 25. Square bevel washer, 26. Hexagon head bolt, 27. Hexagon nut, 28. Elastic washer, 29. Square bevel washer, 30. Hexagon head bolt, 31. Hexagon nut, 32. Elastic washer, 33. Intrinsically safe AC variable frequency speed regulation motor, 34. Ring groove, 35. Slotted cone end set screw, 36. Long retaining ring. DETAILED DESCRIPTION

[0033] The improvements in the embodiments of the present utility model mainly focus on three points. The first is to introduce a reduction gearbox in the field of mining carts. The second is to adjust the assembly method of the parts on the shaft of the current mining cart drive device. The third is that the bearing cover is fixed to the bearing seat 3 with bolts, and a retaining ring is further used for auxiliary locking.

[0034] The subject matter of the utility model is a driving device for a mining cart, and the rest of the mining cart will not be described in detail. It should be known that the mining cart is a necessary equipment in a mine, and its basic configuration belongs to the general knowledge in this field.

[0035] The driving device of the mining cart machine comprises a frame 18, a main shaft 13, a reduction box and an intrinsically safe variable frequency speed regulating motor. Among them, the frame 18 is mostly the main frame of the mining cart machine, which is generally a welded frame constructed of section steel.

[0036] Given that Figures 1 to 3 In the figure, the assembly method of the components on the frame 18 on the frame 18 is clearly illustrated, and will not be described in detail below.

[0037] Regarding the main shaft 13, it is installed on the frame 18 through a pair of bearing assemblies. In some embodiments, the bearing assembly includes a bearing seat 3, a bearing, and a bearing cover that cooperates with the bearing seat 3 to construct a bearing chamber.

[0038] However, it should also be known that in the field of bearing technology, there is a bearing with a cover, in which grease is sealed. Therefore, the bearing assembly may not include a bearing cover. If a bearing with a cover is used, the bearing seat 3 preferably uses a split bearing.

[0039] Even if the bearing seat 3 is adapted with a bearing cover, the bearing seat 3 may also be a split bearing seat.

[0040] It should be known that mining carts are low-speed and heavy-load equipment, so early mining carts were generally driven by hydraulic equipment. The characteristics of hydraulic equipment are high power density, which can meet the requirements of heavy-load equipment. For example, heavy-load equipment such as lifting equipment is generally driven by hydraulic equipment. At the same time, hydraulic equipment can have a relatively good driving ability at low speed, but as mentioned above, hydraulic equipment has its inherent defects, and specially developed low-speed and high-torque adjustable speed motors (commonly used in this field, no further description is given) are used as replacements. In the embodiment of the utility model, an intrinsically safe variable frequency speed regulating motor is used as a power machine, which can be adjusted by frequency conversion, and then adapted to the reduction box, so as to meet the requirements of low speed and heavy load.

[0041] Since low-speed heavy load has a definite designation in this field and is not likely to cause misunderstanding, it will not be elaborated here.

[0042] In addition, in the mechanical field, the gearbox with relatively high transmission efficiency is the gearbox, such as Figure 1 The gear reduction device 17 shown in FIG. 1 has better low-speed transmission capability, so the gear reduction device 17 is preferably used.

[0043] The intrinsically safe variable frequency speed regulating motor is connected to the gear reduction device 17 through a coupling assembly.

[0044] Frequency conversion usually requires the use of alternating current, so intrinsically safe variable frequency speed regulating motors are also called intrinsically safe AC variable frequency speed regulating motors.

[0045] As for the connection between the reduction box and the main shaft 13, a star coupling 14 is preferably used for connection, and in some embodiments, a plum blossom coupling can also be used for connection.

[0046] The coupling used can be an elastic coupling or a rigid coupling, and the latter is preferred because the value of elastic buffering is relatively low in heavy-load and low-speed applications.

[0047] exist Figure 1 In the illustrated structure, the gear reduction device 17 is used to connect the shaft section with the coupling, and specifically, the shaft section exposed from the gear reduction device 17 is shielded by a bell-shaped cover 16 .

[0048] The bell-shaped housing 16 is a common housing in the mechanical field, and its basic structure belongs to the common knowledge in the field, and will not be described in detail here.

[0049] Next, let's consider the second and third improvement points. Currently, the axial positioning methods of parts on the shaft are mainly shoulder positioning, round nut locking, sleeve auxiliary positioning, retaining ring locking, etc. In the embodiment of the present invention, a retaining ring positioning and locking method is adopted.

[0050] It should be known that although the stepped shaft is the most common shaft in the mechanical field, the overall strength of the stepped shaft is affected by the thinnest shaft section, and the stepped shaft will form several shaft shoulders for reliable positioning. In the embodiment of the utility model, a retaining ring of a pipe sleeve structure is used to achieve the positioning and locking of the parts on the shaft to reduce the weakening of the main shaft 13.

[0051] The shaft parts of the main shaft 13 in the mining cart drive device are mainly as follows Figure 1 and 2 The gear 1 shown in the figure may also be a sprocket in some implementations to output power.

[0052] The circumferential connection of parts on the shaft generally adopts key connection, which will not be described here. The axial connection is achieved by using the retaining ring with a shaft sleeve structure as mentioned above. The details are as follows:

[0053] In order to distinguish, Figure 1 In the illustrated structure, the retaining ring used for axial positioning and locking of the gear 1 is called a small retaining ring 9, a retaining ring used for auxiliary locking of the bearing cover is called a short retaining ring 11, and a long retaining ring 12. The "small, short and long" here are only used to distinguish different retaining rings, and do not mean that the three have different structures or constructions.

[0054] First, from Figure 1It can be seen that although the main shaft 13 is also a stepped shaft, the diameter difference between the relatively small diameter shaft section and the relatively large diameter shaft section is relatively small. The shaft section used for mounting the gear 1 can be the shaft section with the largest diameter, but the diameter difference relative to the adjacent shaft sections is relatively small. Its purpose is only to determine the installation position of the gear 1 on the main shaft 13, and because it is necessary to open a keyway on the shaft section used for mounting the gear 1, so as to install the gear 1 as shown in FIG. Figure 1 The A-type flat key 2 shown in the figure will also weaken the strength of the shaft section itself. Therefore, the relatively thick shaft section not only meets the position determination of the gear 1, but also has relatively good strength.

[0055] Figure 1 The small retaining ring 9 in the embodiment is a sleeve-shaped structure, which can be mounted on the main shaft 13 and locked with a set screw after being mounted in place. Therefore, a first set screw hole is opened on the side of the small retaining ring 9, and the first set screw hole is a threaded hole to cooperate with the corresponding set screw, such as Figure 1 Slotted cone point set screw shown in .

[0056] The fit between the small retaining ring 9 and the corresponding shaft section of the main shaft is preferably a clearance fit.

[0057] from Figure 1 It can be seen that the small retaining ring 9 is tightened on the main shaft 13 in a symmetrical manner. At least in the figure, it can be seen that each small retaining ring 9 is adapted with at least a pair of slotted cone-end set screws 10, that is, the first set screw hole is equipped with a pair, so that the small retaining ring 9 is tightened on the main shaft 13 in a symmetrical manner.

[0058] As mentioned above, the diameter of the shaft section where the gear 1 is installed is larger than the diameter of the shaft section where the small retaining ring 9 is installed, which is mainly used to predetermine the installation position of the gear 1 on the main shaft 13. The diameter difference will produce a shaft shoulder, so the small retaining ring 9 has a chamfer, which is beneficial to the installation of the small retaining ring 9 on the one hand, and can also leave a part of the shaft shoulder on the other hand, which is beneficial to the accurate axial positioning of the gear 1.

[0059] It should be known that, purely in terms of positioning, the shoulder of the shaft segment on which the gear 1 is installed can be relatively small, and only needs to satisfy intuitive observation.

[0060] In some embodiments, if the shaft segment for installing the gear 1 on the main shaft 13 is processed into a spline shaft, the exact position of the shaft segment for installing the gear 1 can be directly observed in this part without the need to generate a corresponding shoulder, although at this time the top circle diameter of the spline is larger than the diameter of the remaining shaft segments.

[0061] Regarding the bearing assembly, as mentioned above, in some embodiments, the bearing seat 3 cooperates with the bearing cover to achieve positioning and sealing protection of the bearing. The bearing cover is generally fixed to the bearing seat with bolts (screws). However, in some applications, the bolts may still become loose despite the use of anti-loosening measures. For this reason, in an embodiment of the utility model, a retaining ring is further provided to assist in locking the bearing cover. The retaining rings used for assisting in locking the bearing cover are collectively referred to as second retaining rings.

[0062] The locking method of the second retaining ring is the same as that of the first retaining ring, and both are locked by set screws, which will not be repeated here.

[0063] The difference between the second retaining ring and the first retaining ring is that the second retaining ring has higher requirements, such as Figure 3 As shown, Figure 3 The right end cover 8 shown is a bearing cover with a hole, and the hole is used for the main shaft 13 to penetrate (relative to the bearing chamber). The hole of the bearing cover has a sealing groove, and the sealing groove is provided with a Figure 1 and Figure 3 The felt ring oil seal 4 shown in FIG.

[0064] Figure 3 In the figure, the outer end face of the right end cover 8 has an annular groove 34, the axis of the annular groove 34 is consistent with the axis of the right end cover 8, and the corresponding long retaining ring 36 is provided with an annular protrusion on the end face facing the right end cover 8, and the annular protrusion is inserted into the annular groove 34 to achieve relatively reliable locking.

Claims

1. A mining cart driving device, characterized in that: include: frame; A main shaft, mounted on the frame via a bearing assembly; A reduction box connected to the main shaft via a coupling; An intrinsically safe variable frequency speed regulating motor connected to the reduction box; The bearing assembly comprises a bearing seat fixed on the frame, a bearing installed in a seat hole of the bearing seat, and a bearing cap installed at each end of the seat hole of the bearing seat; The bearing caps include bearing caps with holes and bearing caps without holes. The bearing cover with a hole is fixed on the bearing seat and is limited by a second retaining ring; The second retaining ring is a sleeve-shaped structure, and a second set screw hole is correspondingly opened on the side surface of the second retaining ring; A second set screw is correspondingly provided to lock the second retaining ring on the main shaft through the second set screw hole; The outer end surface of the bearing cover with a hole is provided with an annular groove, and the axis of the annular groove is colinear with the axis of the bearing cover with a hole; The second retaining ring has an annular protrusion inserted into the annular groove.

2. The mining cart driving device according to claim 1, characterized in that: The reduction box and the main shaft are connected by a star coupling or a plum coupling.

3. The mining cart driving device according to claim 1 or 2, characterized in that: The reduction box is used for connecting with the corresponding coupling and the shaft section exposed from the reduction box is covered by a bell-shaped cover.

4. The mining cart driving device according to claim 1, characterized in that: The shaft parts installed on the main shaft for outputting power are positioned and locked by the first retaining ring; The first retaining ring is a sleeve-shaped structure, and a first set screw hole is opened on the side of the first retaining ring; A first set screw is provided accordingly to lock the first retaining ring on the main shaft through the first set screw hole.

5. The driving device for a mining cart according to claim 4, characterized in that: Each first retaining ring is provided with a pair or two pairs of first fixing screw holes, and the two first fixing screw holes in the group are symmetrical about the axis of the first retaining ring.

6. The driving device for a mining cart according to claim 4, characterized in that: The diameter of the shaft section on which the shaft part is installed is larger than the diameter of the shaft section on which the first retaining ring is located; Correspondingly, the inner hole of the first retaining ring has a chamfer.

7. The driving device for a mining cart according to claim 1, characterized in that: Each first retaining ring is provided with a pair or two pairs of first fixing screw holes, and the two first fixing screw holes in the group are symmetrical about the axis of the first retaining ring.

Images